CA1328499C - Electronic access device with visual display - Google Patents
Electronic access device with visual displayInfo
- Publication number
- CA1328499C CA1328499C CA000545118A CA545118A CA1328499C CA 1328499 C CA1328499 C CA 1328499C CA 000545118 A CA000545118 A CA 000545118A CA 545118 A CA545118 A CA 545118A CA 1328499 C CA1328499 C CA 1328499C
- Authority
- CA
- Canada
- Prior art keywords
- microprocessor
- carried
- coupled
- information
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
- G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
- G07F7/10—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means together with a coded signal, e.g. in the form of personal identification information, like personal identification number [PIN] or biometric data
- G07F7/1008—Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07701—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction
- G06K19/07703—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction the interface being visual
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
- G06Q20/34—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using cards, e.g. integrated circuit [IC] cards or magnetic cards
- G06Q20/341—Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
- G06Q20/3415—Cards acting autonomously as pay-media
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/29—Individual registration on entry or exit involving the use of a pass the pass containing active electronic elements, e.g. smartcards
Abstract
Abstract of the Disclosure Electronic access card comprising a printed circuit board. A microprocessor is carried by the printed circuit board. A keyboard is carried by the printed circuit board and is connected to the microprocessor for inserting information into the microprocessor. A coil is carried by the printed circuit board and is coupled to the microprocessor for receiving information to be conveyed to the microprocessor and for transmitting information from the microprocessor. Visual display means is coupled to the microprocessor for visually dis-playing information which is carried in the microproces-sor.
Description
E~ECTRONIC ACCESS DEVICE WITH VISUAL DISPLAY
5This invention relates to an electronic access device with visual display.
In United States Letters Patent No. 4,864,115 there is disclosed an electronic access device comprising a card which can be utilized in connection with a lock box of the type described in United States Letters Patent No.
4,609,780. ~owever, the electronic access device dis-closed in said United States Letters Patent No. 4,609,780 does not have a visual display and has other limitations.
There is therefore a need for a new and improved electronic access device.
In general, it is an object of the present invention to provide an electronic access device which has a visual display.
Another object of the invention is to provide a device of the above character in which information can be scrolled in the visual display.
Another object of the invention is to provide a device of the above character which can be utilized in connection with lock boxes.
,, ,. ~
Another object of the invention is to provide a device of the above character which eliminates the need for telephone transmissions from a lock box.
Another object of the invention is to provide a device of the above character which utilizes active telem-etry.
Another object of the invention is to provide a device of the above character in which a visual display can be given of the entries which have been made in the lock box.
Another object of the invention is to provide a device of the above character which produces an audible signal for telephonic transmission.
Another object of the invention is to provide a device of the above character which has a long life.
Another object of the invention is to provide a device of the above character which gives a low battery indication on the LCD display.
Another object of the invention is to provide a device of the above character in which information can be transmitted to a computer terminal.
Another object of the invention is to provide a device of the above character which can have the informa-tion contained therein read by a reader (via RF telemetry).
Another object of the invention is to provide a device of the above character which is capable of two way high speed transmission.
1328~99 Additional objects and features of the invention will appear from the following description in which the preferred embodiments are set forth in detail in conjunc-tion with the accompanying drawings.
Figure 1 is a front elevational view of an elec-tronic access device with visual display incorporating the present invention.
Figure 2 is a circuit diagram of the circuitry utilized in the electronic access device shown in Figure 1.
Figure 3 is a circuit diagram of another embodi-ment of the electronic circuitry which can be utilized inthe electronic access device shown in Figure 1.
In general, the present electronic access device consists of a printed circuit board. A microprocessor is carried by the printed circuit board. Key pad means is carried by the board and is connected to the microprocessor for inserting information into the microprocessor. Coil means is carried by the printed circuit board and is connected to the microprocessor for receiving and transmit-ting information with respect to the microprocessor.Visual display means is carried by the printed circuit board and is coupled to the microprocessor for displaying information in the microprocessor.
More in particular, the electronic access device 11 having a visual display in many respects is very similar to the electronic access device disclosed in United States Letters Patent No. 4,864,115. As disclosed therein such an electronic access device includes a printed circuit board 12 which has a key pad or keyboard assembly 13 mounted on the front side thereof. The key pad assembly includes a plurality of keys 14 in which 10 of the keys carry the arabic numerals 0-9 and in which other keys carry other suitable indicia. These indicia have been indicated as the letters A-G for convenience of illustration. However, if it is preferable that the exact purpose or function of the key be provided thereon, these functions can be as follows:
A Obtain Key B Remove Shackle C Update Device D 24 Hour Use E Daytime Use F Interrogate Box G Printer Enable In addition, other keys 14 serve as scroll keys in which one of the keys has an arrow facing to the left and the other key has an arrow facing to the right as shown in Figure 1. The remaining key can be identified as the "Clear" and "On" key.
A 10-character alphanumeric liquid crystal display 16 is carried by the upper extremity of the printed circuit board 12 and is connected to circuitry 21 carried by the printed circuit board 12 as shown schematically in Figure 2. As shown in Figure 2, the circuitry 21 includes a microprocessor 22 of a conventional type which is con-trolled by a crystal clock 23. Several peripherals are connected to the microprocessor 22 and take the form of a memory 24 which is connected to the microprocessor by data lines 26 and address lines 27. The memory 23 can be of any suitable size ranging from lk up to 64k. A key pad or keyboard assembly 13 is connected to the microprocessor which is capable of ascertaining key depressions in the keyboard assembly 13. The microprocessor 22 is also connected to the LCD
display 16 by a conventional LCD driver 31 which is con-nected to the microprocessor 22.
A battery 36 such as a lithium battery is mounted on the printed circuit board and supplies a suitable voltage such as three volts. The battery is connected to passive telecommunication circuitry 37 also carried by the printed circuit board. The circuitry 37 is used for communicating with an external device 38 such as a lock box of the type described in United States Letters Patent No.
4,609,780. The passive telecommunication circuitry 37 includes a coil L1 which is adapted to communicate with a coil L2 forming a part of the external device 38. The coil L1 is connected across a full wave diode bridge rectifier 41. The output of the rectifier 41 is supplied through a protective network 42 consisting of a resistor Rl, a diode Dl and a zener diode D2 to an input I of the micropro-cessor 22. The protective network 42 serves to protect the microprocessor 22 from inductive spikes which might be picked up by the communication coil L1. The diode D2 has an appropriate breakdown voltage which is less than the breakdown voltage of the transistor Q1. A capacitor C1 in conjunction with a resistor R2 provides appropriate filter-ing. With the electronic access device 11 shown in Figure 1 and which includes the circuitry shown in Figure 2, power consumption from the battery is minimal during transmission and reception. The same coil L1 is utilized for both transmission and reception. During the reception, the voltage induced in the coil Ll within the electronic access device is rectified by the bridge rectifier 41 and supplied to the microprocessor input I through the protective network.
- 6 - 1328~99 By way of example, the transmission typically received by the coil L1 is pulse width modulated, which information is supplied to the microprocessor 22. The microprocessor converts the information into digital l's and O's for storage in the memory 23. The output of the microprocessor is supplied on the terminal 0 to the gate of a N-channel MOSFET transistor Q1. The drain of the tran-sistor Q1 is connected to the ~ridge rectifier 41.
With the electronic access device 11 shown inFigure 1 and which includes the circuitry shown in Figure 2, power consumption from the battery is minimal during transmission and reception. The same coil L1 is utilized for both transmission and reception. During the reception, the voltage induced in the coil L1 within the electronic access device is rectified by the bridge rectifier 41 and supplied to the microprocessor input I through the protec-tive network.
The resistor R2 and the capacitor C1 provide afilter with a RC time constant which is less that 1/10th the shortest pulse width in the pulse wave transmission being received by the electronic access device. The voltage induced in the coil L1 is equal to or greater than 3 volts so that no amplification is requir~d within the access device.
During transmission from the electronic access device, the microprocessor 22 reads the contents from the memory 23 and serially transmits a pulse width modulated stream of data through the output 01. The transistor Ql is turned on for the appropriate duration, depending on whether it is an O or a 1. When the transistor Q1 turns on, a low impedance load is placed across the coil L1 and when the _ 7 _ 1 3 2 8 ~ ~ 9 transistor Q1 is turned off, the loading on the coil L1 is removed.
During transmission by the electronic access device, the external device 38 supplies and maintains an unmodulated radio frequency field surrounding the access device coil Ll. The loading and unloading of the coil L1 by the turning on and off of the transistor Q1 modulates the loading effect of the coil L1 on the coil L2 of the external device 38 and thus essentially creates an ampli-tude modulated pulse width modulated signal across the coil L2. The external device 38 demodulates this information so that it can be utilized for further processing if desired in the external device.
A type of telemetry which is utilized in the electronic access device is particularly useful since it requires the use of very little power, thus prolonging the useful life of the access device battery 36.
It can be seen that the microprocessor 22 does not expend any energy in transmission except for turning the transistor Q1 on and off which is quite small. Thus no energy is used from the internal battery to power the inductor coil L1. This helps to prolong the life of the battery 36 and thereby the life of the device before battery rep7acement is required. Radio frequency communi-cation can be utilized for the communication link between L1 and L2. The coil L1 merely loads and unloads an exter-nally present RF field generated by the coil L2.
The device has an additional advantage since itdoes not transmit radio frequency energy it will not disturb devices in close proximity to it, or accidentally erase magnetic strips on credit cards.
1328~99 Means is provided for ascertaining when a low battery condition occurs and takes the form of a battery voltage measuring device 46 which is comprised of a compar-ator 47 that is provided with a suitable reference 48 suchas one having 1.2 volts. A voltage divider network 49 having resistors R3 and R4 reduces the voltage from the battery so that it can be compared with the 1.2 volt reference.
Operation and use of the electronic access device 11 may now be briefly described as follows. The electronic access device 11 can be programmed so that it contains additional information other than the identification number described in United States Letters Patent No. 4,864,115.
For example, the user's name (real estate broker), his phone number and his address can be programmed into the device using ASCII characters. Thus, when a real estate agent opens the key container of a lock box, in addition to his identification number being transferred into the lock box, listing information including his name, address and the like would also be transferred. This information is stored in the lock box. When the owner of the lock box arrives to poll the lock box to ascertain the number of visits and who visited the listed property, the information which is carried in the lock box can be read by the elec-tronic access device 11 of the present invention when it is inserted into the lock box. The scroll keys provided on the electronic access device can be actuated to cause information which has been passed into the electronic access device 11 from the lock box to scroll across the liquid crystal display 16. In this way it is possible for a listing agent to rapidly ascertain the activity which has occurred to a listed property. If necessary, the real estate agent can rescroll the ~' i information by depressing the appropriate keys on the keyboard 13. If desired, the listing real estate agent can make notes with respect to information appearing on the liquid crystal display 16. Thus it can be seen with such an electronic access device 11, the need for a telephone transmission to a central computer is eliminated. Utiliz~
ing the electronic access device 11 gives an immediate alphanumeric display making it possible to access all the entries in the lock box.
It should be appreciated that if desired a small speaker could be mounted on the printed circuit board of the device 12 which could be utilized for transmitting information telephonically to a computer terminal. The device can use FM, FSK, AM, or DTMF transmission. Syn-thetic speech can be added to speak the contents of the memory in addition to the display on the LCD display.
Alternatively, a special computer or reader could be utilized to read the information carried by the device. In other words, a real estate broker could take his device and read out all of the boxes in which he is the listing agent and thereby store the information contained in the differ-ent lock boxes. After he has made his rounds and collected the information he could come back to his office and obtain a printout of the information contained in the lock boxes.
It should be appreciated that a printout is not needed since the information is readily available on the display 16 merely by operating the scroll keys on the keyboard 13.
Another embodiment of the circuitry which can be provided on the electronic access device 11 is shown in Figure 3 and as hereinafter described includes active telemetry or telecommunication circuitry which permits communication between a master device and a slave device.
The 1~284~9 circuitry 51 which is shown in Figure 3 includes a micro-processor 52 of a conventional type controlled by a crystal clock 53 as well as a memory 54 connected by data and address lines 56 and 57.
A keyboard 58 is provided similar to the keyboard 13 but is different in that it is a full alphanumeric keyboard having all the alphabet characters from a to z, the numerals from 0 to 9 and various function keys.
The circuitry shown in Figure 3 as the circuitry in Figure 2 includes a display 61 of the same type as the display 16 in Figure 2 which is connected through a driver 62 to the microprocessor 52. A speaker 63 is coupled to the microprccessor 52 through a speech synthesizer 64 providing an audio output from the information supplied by the microprocessor to the LCD display 61. The speech synthesizer 64 can be programmed to provide a male or female voice.
The active telemetry circuitry 65 of the circui-try shown in Figure 3 consists of the coil L1 which func-tions in a manner similar to the coil L1 in Figure 2. It is coupled through a filter network 66 consisting of a diode Dl, a capacitor Cl and a resistor R1 to the input I
of the microprocessor 52. The output 0 of the micropro-cessor 52 is coupled to the gate of a high frequency gatable oscillator 67 having a frequency range from ap-proximately 10 khz to 1 megahertz. The output of the oscillator 67 is connected to a transistor Q1 which can be a P N P transistor or a P channel MOSFET transistor. The transistor Q1 is connected to the coil L1 and supplies energy to the coil L1 to cause it to radiate 1~28~99 radio frequency energy which can be picked up by the pick-up coil of an external device of the type described in conjunction with Figure 2. The output from the micropro-cessor 52 typically is in the form of pulse width modula-tion.
Operation and use of the circuitry shown in Figure 3 in conjunction with electronic access device with visible display is very similar to that hereinbefore described in conjunction with Figure 2. The principal difference is that active telemetry is utilized in the circuitry shown in Figure 3 whereas passive telemetry is utilized in the circuitry shown in Figure 2. As hereinbefore explained, the electronic access devices are particularly adapted for use with external devices such as lock boxes. The electronic access devices with active telemetry can be utilized in place of a central station and can be programmed for receiving a program for generating cyclic codes that are needed for electronic access devices and for reading and displaying the information contained in the lock boxes. In such an application, the master device would have a complete alphanumeric keyboard 58 of the type hereinbefore described. Slave devices for utilization with such a master device would only need a limited keyboard such as the type shown in Figure 2. The master device with the complete alphanumeric keyboard makes it possible to enter user names and other information when programming the slave devices. The master device is capable of generating cyclic codes to validate the slave devices. If desired, it should be appreciated that the slave devices can also be of the type described in United States Letters Patent No.
5This invention relates to an electronic access device with visual display.
In United States Letters Patent No. 4,864,115 there is disclosed an electronic access device comprising a card which can be utilized in connection with a lock box of the type described in United States Letters Patent No.
4,609,780. ~owever, the electronic access device dis-closed in said United States Letters Patent No. 4,609,780 does not have a visual display and has other limitations.
There is therefore a need for a new and improved electronic access device.
In general, it is an object of the present invention to provide an electronic access device which has a visual display.
Another object of the invention is to provide a device of the above character in which information can be scrolled in the visual display.
Another object of the invention is to provide a device of the above character which can be utilized in connection with lock boxes.
,, ,. ~
Another object of the invention is to provide a device of the above character which eliminates the need for telephone transmissions from a lock box.
Another object of the invention is to provide a device of the above character which utilizes active telem-etry.
Another object of the invention is to provide a device of the above character in which a visual display can be given of the entries which have been made in the lock box.
Another object of the invention is to provide a device of the above character which produces an audible signal for telephonic transmission.
Another object of the invention is to provide a device of the above character which has a long life.
Another object of the invention is to provide a device of the above character which gives a low battery indication on the LCD display.
Another object of the invention is to provide a device of the above character in which information can be transmitted to a computer terminal.
Another object of the invention is to provide a device of the above character which can have the informa-tion contained therein read by a reader (via RF telemetry).
Another object of the invention is to provide a device of the above character which is capable of two way high speed transmission.
1328~99 Additional objects and features of the invention will appear from the following description in which the preferred embodiments are set forth in detail in conjunc-tion with the accompanying drawings.
Figure 1 is a front elevational view of an elec-tronic access device with visual display incorporating the present invention.
Figure 2 is a circuit diagram of the circuitry utilized in the electronic access device shown in Figure 1.
Figure 3 is a circuit diagram of another embodi-ment of the electronic circuitry which can be utilized inthe electronic access device shown in Figure 1.
In general, the present electronic access device consists of a printed circuit board. A microprocessor is carried by the printed circuit board. Key pad means is carried by the board and is connected to the microprocessor for inserting information into the microprocessor. Coil means is carried by the printed circuit board and is connected to the microprocessor for receiving and transmit-ting information with respect to the microprocessor.Visual display means is carried by the printed circuit board and is coupled to the microprocessor for displaying information in the microprocessor.
More in particular, the electronic access device 11 having a visual display in many respects is very similar to the electronic access device disclosed in United States Letters Patent No. 4,864,115. As disclosed therein such an electronic access device includes a printed circuit board 12 which has a key pad or keyboard assembly 13 mounted on the front side thereof. The key pad assembly includes a plurality of keys 14 in which 10 of the keys carry the arabic numerals 0-9 and in which other keys carry other suitable indicia. These indicia have been indicated as the letters A-G for convenience of illustration. However, if it is preferable that the exact purpose or function of the key be provided thereon, these functions can be as follows:
A Obtain Key B Remove Shackle C Update Device D 24 Hour Use E Daytime Use F Interrogate Box G Printer Enable In addition, other keys 14 serve as scroll keys in which one of the keys has an arrow facing to the left and the other key has an arrow facing to the right as shown in Figure 1. The remaining key can be identified as the "Clear" and "On" key.
A 10-character alphanumeric liquid crystal display 16 is carried by the upper extremity of the printed circuit board 12 and is connected to circuitry 21 carried by the printed circuit board 12 as shown schematically in Figure 2. As shown in Figure 2, the circuitry 21 includes a microprocessor 22 of a conventional type which is con-trolled by a crystal clock 23. Several peripherals are connected to the microprocessor 22 and take the form of a memory 24 which is connected to the microprocessor by data lines 26 and address lines 27. The memory 23 can be of any suitable size ranging from lk up to 64k. A key pad or keyboard assembly 13 is connected to the microprocessor which is capable of ascertaining key depressions in the keyboard assembly 13. The microprocessor 22 is also connected to the LCD
display 16 by a conventional LCD driver 31 which is con-nected to the microprocessor 22.
A battery 36 such as a lithium battery is mounted on the printed circuit board and supplies a suitable voltage such as three volts. The battery is connected to passive telecommunication circuitry 37 also carried by the printed circuit board. The circuitry 37 is used for communicating with an external device 38 such as a lock box of the type described in United States Letters Patent No.
4,609,780. The passive telecommunication circuitry 37 includes a coil L1 which is adapted to communicate with a coil L2 forming a part of the external device 38. The coil L1 is connected across a full wave diode bridge rectifier 41. The output of the rectifier 41 is supplied through a protective network 42 consisting of a resistor Rl, a diode Dl and a zener diode D2 to an input I of the micropro-cessor 22. The protective network 42 serves to protect the microprocessor 22 from inductive spikes which might be picked up by the communication coil L1. The diode D2 has an appropriate breakdown voltage which is less than the breakdown voltage of the transistor Q1. A capacitor C1 in conjunction with a resistor R2 provides appropriate filter-ing. With the electronic access device 11 shown in Figure 1 and which includes the circuitry shown in Figure 2, power consumption from the battery is minimal during transmission and reception. The same coil L1 is utilized for both transmission and reception. During the reception, the voltage induced in the coil Ll within the electronic access device is rectified by the bridge rectifier 41 and supplied to the microprocessor input I through the protective network.
- 6 - 1328~99 By way of example, the transmission typically received by the coil L1 is pulse width modulated, which information is supplied to the microprocessor 22. The microprocessor converts the information into digital l's and O's for storage in the memory 23. The output of the microprocessor is supplied on the terminal 0 to the gate of a N-channel MOSFET transistor Q1. The drain of the tran-sistor Q1 is connected to the ~ridge rectifier 41.
With the electronic access device 11 shown inFigure 1 and which includes the circuitry shown in Figure 2, power consumption from the battery is minimal during transmission and reception. The same coil L1 is utilized for both transmission and reception. During the reception, the voltage induced in the coil L1 within the electronic access device is rectified by the bridge rectifier 41 and supplied to the microprocessor input I through the protec-tive network.
The resistor R2 and the capacitor C1 provide afilter with a RC time constant which is less that 1/10th the shortest pulse width in the pulse wave transmission being received by the electronic access device. The voltage induced in the coil L1 is equal to or greater than 3 volts so that no amplification is requir~d within the access device.
During transmission from the electronic access device, the microprocessor 22 reads the contents from the memory 23 and serially transmits a pulse width modulated stream of data through the output 01. The transistor Ql is turned on for the appropriate duration, depending on whether it is an O or a 1. When the transistor Q1 turns on, a low impedance load is placed across the coil L1 and when the _ 7 _ 1 3 2 8 ~ ~ 9 transistor Q1 is turned off, the loading on the coil L1 is removed.
During transmission by the electronic access device, the external device 38 supplies and maintains an unmodulated radio frequency field surrounding the access device coil Ll. The loading and unloading of the coil L1 by the turning on and off of the transistor Q1 modulates the loading effect of the coil L1 on the coil L2 of the external device 38 and thus essentially creates an ampli-tude modulated pulse width modulated signal across the coil L2. The external device 38 demodulates this information so that it can be utilized for further processing if desired in the external device.
A type of telemetry which is utilized in the electronic access device is particularly useful since it requires the use of very little power, thus prolonging the useful life of the access device battery 36.
It can be seen that the microprocessor 22 does not expend any energy in transmission except for turning the transistor Q1 on and off which is quite small. Thus no energy is used from the internal battery to power the inductor coil L1. This helps to prolong the life of the battery 36 and thereby the life of the device before battery rep7acement is required. Radio frequency communi-cation can be utilized for the communication link between L1 and L2. The coil L1 merely loads and unloads an exter-nally present RF field generated by the coil L2.
The device has an additional advantage since itdoes not transmit radio frequency energy it will not disturb devices in close proximity to it, or accidentally erase magnetic strips on credit cards.
1328~99 Means is provided for ascertaining when a low battery condition occurs and takes the form of a battery voltage measuring device 46 which is comprised of a compar-ator 47 that is provided with a suitable reference 48 suchas one having 1.2 volts. A voltage divider network 49 having resistors R3 and R4 reduces the voltage from the battery so that it can be compared with the 1.2 volt reference.
Operation and use of the electronic access device 11 may now be briefly described as follows. The electronic access device 11 can be programmed so that it contains additional information other than the identification number described in United States Letters Patent No. 4,864,115.
For example, the user's name (real estate broker), his phone number and his address can be programmed into the device using ASCII characters. Thus, when a real estate agent opens the key container of a lock box, in addition to his identification number being transferred into the lock box, listing information including his name, address and the like would also be transferred. This information is stored in the lock box. When the owner of the lock box arrives to poll the lock box to ascertain the number of visits and who visited the listed property, the information which is carried in the lock box can be read by the elec-tronic access device 11 of the present invention when it is inserted into the lock box. The scroll keys provided on the electronic access device can be actuated to cause information which has been passed into the electronic access device 11 from the lock box to scroll across the liquid crystal display 16. In this way it is possible for a listing agent to rapidly ascertain the activity which has occurred to a listed property. If necessary, the real estate agent can rescroll the ~' i information by depressing the appropriate keys on the keyboard 13. If desired, the listing real estate agent can make notes with respect to information appearing on the liquid crystal display 16. Thus it can be seen with such an electronic access device 11, the need for a telephone transmission to a central computer is eliminated. Utiliz~
ing the electronic access device 11 gives an immediate alphanumeric display making it possible to access all the entries in the lock box.
It should be appreciated that if desired a small speaker could be mounted on the printed circuit board of the device 12 which could be utilized for transmitting information telephonically to a computer terminal. The device can use FM, FSK, AM, or DTMF transmission. Syn-thetic speech can be added to speak the contents of the memory in addition to the display on the LCD display.
Alternatively, a special computer or reader could be utilized to read the information carried by the device. In other words, a real estate broker could take his device and read out all of the boxes in which he is the listing agent and thereby store the information contained in the differ-ent lock boxes. After he has made his rounds and collected the information he could come back to his office and obtain a printout of the information contained in the lock boxes.
It should be appreciated that a printout is not needed since the information is readily available on the display 16 merely by operating the scroll keys on the keyboard 13.
Another embodiment of the circuitry which can be provided on the electronic access device 11 is shown in Figure 3 and as hereinafter described includes active telemetry or telecommunication circuitry which permits communication between a master device and a slave device.
The 1~284~9 circuitry 51 which is shown in Figure 3 includes a micro-processor 52 of a conventional type controlled by a crystal clock 53 as well as a memory 54 connected by data and address lines 56 and 57.
A keyboard 58 is provided similar to the keyboard 13 but is different in that it is a full alphanumeric keyboard having all the alphabet characters from a to z, the numerals from 0 to 9 and various function keys.
The circuitry shown in Figure 3 as the circuitry in Figure 2 includes a display 61 of the same type as the display 16 in Figure 2 which is connected through a driver 62 to the microprocessor 52. A speaker 63 is coupled to the microprccessor 52 through a speech synthesizer 64 providing an audio output from the information supplied by the microprocessor to the LCD display 61. The speech synthesizer 64 can be programmed to provide a male or female voice.
The active telemetry circuitry 65 of the circui-try shown in Figure 3 consists of the coil L1 which func-tions in a manner similar to the coil L1 in Figure 2. It is coupled through a filter network 66 consisting of a diode Dl, a capacitor Cl and a resistor R1 to the input I
of the microprocessor 52. The output 0 of the micropro-cessor 52 is coupled to the gate of a high frequency gatable oscillator 67 having a frequency range from ap-proximately 10 khz to 1 megahertz. The output of the oscillator 67 is connected to a transistor Q1 which can be a P N P transistor or a P channel MOSFET transistor. The transistor Q1 is connected to the coil L1 and supplies energy to the coil L1 to cause it to radiate 1~28~99 radio frequency energy which can be picked up by the pick-up coil of an external device of the type described in conjunction with Figure 2. The output from the micropro-cessor 52 typically is in the form of pulse width modula-tion.
Operation and use of the circuitry shown in Figure 3 in conjunction with electronic access device with visible display is very similar to that hereinbefore described in conjunction with Figure 2. The principal difference is that active telemetry is utilized in the circuitry shown in Figure 3 whereas passive telemetry is utilized in the circuitry shown in Figure 2. As hereinbefore explained, the electronic access devices are particularly adapted for use with external devices such as lock boxes. The electronic access devices with active telemetry can be utilized in place of a central station and can be programmed for receiving a program for generating cyclic codes that are needed for electronic access devices and for reading and displaying the information contained in the lock boxes. In such an application, the master device would have a complete alphanumeric keyboard 58 of the type hereinbefore described. Slave devices for utilization with such a master device would only need a limited keyboard such as the type shown in Figure 2. The master device with the complete alphanumeric keyboard makes it possible to enter user names and other information when programming the slave devices. The master device is capable of generating cyclic codes to validate the slave devices. If desired, it should be appreciated that the slave devices can also be of the type described in United States Letters Patent No.
4,864,115.
.~
With the use of the active telemetry shown in Figure 3, it can be seen that battery power is utilized during transmission of information to create electromag-netic or radio frequency radiation to convey the informa-tion to an external device. As pointed out previously, battery power is not required for this function with the circuitry shown in Figure 2.
From the foregoing it can be seen that in connec-tion with the present invention it has been possible to provide an electronic access device which has a visual display I Q provide an immediate readout when desired, as for example, from a lock box to ascertain the activity with respect to that lock box. Device to device communication is possible. Trans-telephonic communication is possible utilizing the audio output, thereby making it possible to transmit information from a device to a central computer.
~he device 11 is capable of performing several central computer functions, such as generating cyclic codes, programming slave access devices and interrogating slave access devices and lock boxes.
A speaker/microphone can be provided for inter-facing with telephonic communication devices. High speed communication is possible with the electronic access devices making it possible to transmit substantial amounts of information, as for example, the user's true identity, by supplying the full name and the telephone number of the user upon each opening of the lock box. High speed two-way communication is provided between the electronic access devices and external devices ~,, 1328~99 such as lock boxes. The alphanumeric display provided by the liquid crystal display provides an immediate readout from lock boxes to give the activity with respect to that lock box. The electronic access devices, even though having these capabilities, can have a life ranging from 3 to 5 years. A low battery indication is provided on the liquid crystal display. Large internal memory can be provided. The circuitry provided permits the use of low cost CMOS microprocessors.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
.~
With the use of the active telemetry shown in Figure 3, it can be seen that battery power is utilized during transmission of information to create electromag-netic or radio frequency radiation to convey the informa-tion to an external device. As pointed out previously, battery power is not required for this function with the circuitry shown in Figure 2.
From the foregoing it can be seen that in connec-tion with the present invention it has been possible to provide an electronic access device which has a visual display I Q provide an immediate readout when desired, as for example, from a lock box to ascertain the activity with respect to that lock box. Device to device communication is possible. Trans-telephonic communication is possible utilizing the audio output, thereby making it possible to transmit information from a device to a central computer.
~he device 11 is capable of performing several central computer functions, such as generating cyclic codes, programming slave access devices and interrogating slave access devices and lock boxes.
A speaker/microphone can be provided for inter-facing with telephonic communication devices. High speed communication is possible with the electronic access devices making it possible to transmit substantial amounts of information, as for example, the user's true identity, by supplying the full name and the telephone number of the user upon each opening of the lock box. High speed two-way communication is provided between the electronic access devices and external devices ~,, 1328~99 such as lock boxes. The alphanumeric display provided by the liquid crystal display provides an immediate readout from lock boxes to give the activity with respect to that lock box. The electronic access devices, even though having these capabilities, can have a life ranging from 3 to 5 years. A low battery indication is provided on the liquid crystal display. Large internal memory can be provided. The circuitry provided permits the use of low cost CMOS microprocessors.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (21)
1. In an electronic access device for use with a lock device, a printed circuit board, a microprocessor carried by the printed circuit board, keyboard means connected to the microprocessor for inserting information into the microprocessor, coupling means coupled to the microprocessor and adapted to receive information from the lock device to be conveyed to the microprocessor and adapted to transmit information from the microprocessor to the lock device, and an alphanumeric visual display means coupled to the microprocessor for visually displaying information which is carried in the microprocessor and supplied to or from the lock device.
2. A device as in Claim 1 wherein the keyboard means is a full alphanumeric keyboard and scroll keys for scroll-ing information received from the lock device.
3. A device as in Claim 1 wherein the coupling means includes electronic circuitry.
4. A device as in Claim 3 wherein said electronic circuitry is passive electronic circuitry.
5. A device as in Claim 3 wherein said electronic circuitry is active electronic circuitry.
6. A device as in Claim 5 wherein said active elec-tronic circuitry includes transistor means and a high frequency gatable oscillator connected to the transistor.
7. A device as in Claim 4 wherein said passive elec-tronic circuitry includes a bridge and transistor means coupled between the microprocessor and the bridge.
8. A device as in Claim 3 wherein said electronic circuitry includes filter means.
9. A device as in Claim 1 together with a battery carried by the device and connected to the microprocessor.
10. A device as in Claim 9 together with low battery comparison means coupled to the battery and to the micro-processor to provide a low battery indication on the display in the event a low battery condition occurs.
11. A device as in Claim 1 wherein said display is a liquid crystal display.
12. A device as in Claim 1 together with a clock coupled to the microprocessor.
13. A device as in Claim 1 together with acoustical communication means coupled to the microprocessor.
14. A device as in Claim 13 wherein said acoustical communication means includes a synthetic speech synthesiz-er.
15. In an electronic access device for use with a lock device, a printed circuit board, a microprocessor carried by the printed circuit board, keyboard means carried by the printed circuit board and connected to the microprocessor for inserting information into the micropro-cessor, coupling means carried by the printed circuit board and coupled to the microprocessor and adapted to receive information from the lock device and adapted to transmit information to the lock device, and an alphanumeric visual display means coupled to the microprocessor for visually displaying information which is carried in the micropro-cessor and supplied to or from the lock device.
16. A device as in Claim 15 wherein said keyboard means is a complete alphanumeric keyboard.
17. A device as in Claim 15 wherein said coupling means comprises active electronic circuitry, said circuitry comprising transistor means connected to said coupling means and a high frequency gatable oscillator coupled to the microprocessor and coupled to the transistor.
18. A device as in Claim 15 together with filter means connected between the coupling means and the input to the microprocessor.
19. A device as in Claim 17 together with a battery carried by the device and connected to the microprocessor and to the active electronic circuitry.
20. A device as in Claim 19 together with low voltage battery ascertaining circuitry connected to the battery and coupled to the microprocessor for giving an indication when a low battery condition occurs.
21. A device as in Claim 15 together with audible communication means coupled to the microprocessor and carried by the device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/899,338 US4800255A (en) | 1986-08-22 | 1986-08-22 | Electronic access card with visual display |
| US899,338 | 1986-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1328499C true CA1328499C (en) | 1994-04-12 |
Family
ID=25410809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000545118A Expired - Lifetime CA1328499C (en) | 1986-08-22 | 1987-08-21 | Electronic access device with visual display |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4800255A (en) |
| CA (1) | CA1328499C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US4800255A (en) | 1989-01-24 |
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