EP0209269A2 - Emergency sign - Google Patents
Emergency sign Download PDFInfo
- Publication number
- EP0209269A2 EP0209269A2 EP86304861A EP86304861A EP0209269A2 EP 0209269 A2 EP0209269 A2 EP 0209269A2 EP 86304861 A EP86304861 A EP 86304861A EP 86304861 A EP86304861 A EP 86304861A EP 0209269 A2 EP0209269 A2 EP 0209269A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- battery
- comparator
- sign according
- emergency sign
- rectifier
- 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.)
- Withdrawn
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
- G08B7/062—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources indicating emergency exits
Definitions
- the present invention relates generally to an illuminated exit sign and, in particular, to a control circuit for supplying AC and DC power to a plurality of series connected light sources in an exit sign.
- emergency exit signs are known in the art including those that operate on either AC or DC power. Exit signs of this type frequently require two sets of illuminating lamps, one set for AC operation and a second set for DC operation. Many of the known emergency exit signs use incandescent light bulbs as an illuminating source which use a comparatively high amount of power, thus draining a battery rapidly during DC operation. Also, incandescent light bulbs have a tendency to burn out and must be replaced periodically, adding maintenance costs to the overall cost of the exit sign.
- an emergency exit sign and control circuit having light sources, which are preferably light emitting diodes, connected in a plurality of series combinations each having a predetermined number of light sources.
- the series combinations are connected in parallel across the output of the control circuit.
- the control circuit applies continuous power to the light sources during AC operation and charges a battery when required.
- An indicator on the exit sign shows the charging state of the battery.
- the control circuit pulses battery power to the light sources causing the illuminated display to flash. Battery power is continued until the battery reaches a predetermined minimum voltage, at which time the control circuit shuts the light sources off, or until AC power is restored, when the sign will again be continuously illuminated and the battery recharged.
- the present device thus provides an illuminated exit sign preferably using light emitting diodes which provide improved visibility, use low power for longer DC operation, and have a longer life for infrequent replacement.
- a correct voltage drop may be supplied across each light emitting diode without using series resistors.
- the elimination of series resistors from the device reduces power consumption and improves visibility of the exit sign.
- the present invention thus, provides an improved exit sign having many features distinguishable over the prior art.
- an illuminated emergency exit sign is shown generally at 10 having a housing 12 and a display board 14 with the word "EXIT" marked thereon at 16 and arrows pointing in opposed directions at 18.
- a second display board 14 substantially identical to the first may be mounted in the other side of the housing 12.
- FIG 2 shows a rear view of the display board 14 of Figure 1 having connections 20 for a plurality of light emitting diodes (LEDs).
- the connections 20 are arranged to spell the word "EXIT" 16 and to form the arrows 18.
- an LED 22 is shown in dotted outline connected at connecting points 24 and 26.
- the display board 14 includes first and second power connections 28 and 30 to which voltage is applied to illuminate the LEDs 22 of the exit sign 10.
- Figure 3 shows a series combinations 32 of three light emitting diodes 22 for use in the display board 14 of Figure 2.
- a forward voltage drop of 2.1 volts is required across each of the LEDs 22 for proper operation.
- the voltage drop required across the combination 32 of Figure 3 is 6.3 volts. Since the display board 14 of Figure 2 includes only the series combinations 32 of three LEDs 22, 6.3 volts must be applied across the power connection points 28 and 30 for proper operation.
- Figure 4 shows two light emitting diodes 22 connected in a series combination 34 which may be used in place of the three light emitting diodes 22 of Figure 3.
- the voltage required for application across the combination 34 of Figure 4 is 4.2 volts, therefore, should the display board 14 of Figure 2 be arranged in such a way as to include only LEDs 22 in series combinations 34 of two, a 4.2 volt power supply would be required at power connecting points 28 and 30.
- Figure 5 shows six series connected light emitting diodes 22.
- a 12.6 volt power supply must be applied across a combination 36 of Figure 5. Therefore, if the display board 14 of Figure 2 were arranged to include only light emitting diodes 22 in series combinations 36 of six, a 12.6 volt power supply must be applied to the leads 28 and 30. It may be seen from the foregoing that any number of series connected LEDs may be used in the present device.
- FIG. 6 shows a control circuit 40 for applying power to the display board 14 of Figure 2.
- the control circuit 40 includes a transformer 42, a bridge rectifier 44, a comparator 46, a multi-vibrator 48, a voltage regulator 50, and transistors 52, 54, 56, 58, 60, 62, and 64, as well fas a variety of other circuit elements to insure proper operation.
- a power line such as a110 volt AC power line, is connected across leads 66 and 68 of the transformer 42 producing, in a preferred embodiment, a 10 volt AC signal at outputs 70 and 72 of the transformer 42.
- the 10 volt AC signal is applied through test switch 74, the importance of which will be discussed hereinafter, to inputs 76 and 78 of the bridge rectifier 44.
- a full wave rectified signal appears at rectifier outputs 80 and 82 which is applied through resistor 84 to the voltage regulator 50 at an input 88.
- the voltage regulator 50 of a preferred embodiment is a 5 volt regulator and has a ground connection 90 and an output 92.
- the ground connection 90 is connected to circuit ground through three series connected diodes 94, 96 and 98. This results in the output voltage of the regulator 50 being raised by 6.3 volts, or the sum of the 2.1 volt drop across each of the diodes 94, 96 and 98.
- the regulator output is then fed through diode 100 to the power connections 28 and 30, which are the same power connections as on the display board 14 shown in Figure 2.
- the full wave rectified signal is fed through resistor 102 and filtered by capacitor 104 to produce an essentially DC signal.
- the DC signal is divided by voltage divider resistors 106 and 108 and applied through resistor 110 to base 112 of the transistor 52.
- the application of power to the base 112 of transistor 52 causes the transistor 52 to begin conducting, which acts through resistor 114 to pull pin 116 of the comparator 46 below a threshold level.
- the resistors 118 and 120 had been maintaining the pin 116 above the threshold level, which in a preferred embodiment is 5.85 volts. Pulling the voltage a pin 116 below the threshold level results in a low state being produced at pin 122 of the comparator 46.
- the low is applied through resistor 124 to base 126 of the transistor 56 to cause the transistor 56 to assume a non-conducting state.
- the transistor 52 will cease conducting and allow the voltage at the pin 116 of the comparator 46 to rise above the threshold level which will result in a high signal at the pin 122 of the comparator 46.
- the high signal at the pin 122 is applied through the resistor 124 to the base 126 of the transistor 56, causing the transistor 56 to commence conducting and draw current through resistors 128 and 130.
- the flow of current through the voltage divider resistors 128 and 130 causes a voltage to be applied to base 132 of the transistor 58 so that transistor 58 is turned on which causes voltage from battery 134 to be applied to pins 136 and 138 of the multi-vibrator, or timer, 48.
- the application of power to the pins 136 and 138 causes output 140 of the timer 48 to oscillate.
- the oscillating signal is applied to base 142 of the transistor 60 through resistor 144. Consequently, the transistor 60 switches on and off at the timer oscillation rate.
- the switching of transistor 60 operates through resistors 146 and 148 to cause the transistor 62 likewise to switch on and off at the timer oscillation rate.
- Each time the transistor 62 is switched on it applies voltage from the battery 134 to the power leads 28 and 30 of the display board 14, and each time the transistor is switched off, the battery voltage is disconnected from the power leads 28 and 30. Therefore, interruption of AC line power to the circuit results in the LEDs 22 in the exit sign 10 flashing at the oscillation rate of the timer 48.
- Capacitor 154 is of sufficiently high capacitance value to enable the pin 152 to remain high.
- the pin 122 will assume a low state, cutting off the transistor 56 and in turn cutting off the transistor 58. This has the effect of disconnecting the battery 134 from the power connections 28 and 30.
- Pin 156 of the comparator 46 senses the battery voltage during AC power through resistors 158 and 160 and capacitor 162. Hysteresis is built into the comparator 46 by the provision of feedback to the pin 156 so that upper and lower threshold levels are established for sensing battery voltage. When the pin 156 reaches the lower threshold limit, indicating that the battery 134 voltage is low, a low state is produced on pin 164 of the comparator 46, and when the pin 156 reaches the higher threshold limit, indicating that the battery 134 is fully charged, a high signal is produced on the pin 164.
- a low state at the pin 164 turns on the transistor 64 which applies charging current to the battery 134 through diode 166.
- a low state on the pin 164 also draws current through diode 168, which is a light emitting diode, indicating that the battery is charging.
- the high state at the pin 164 turns off the transistor 64 and the light emitting diode 168 and applies a high signal to base 170 of the transistor 54, causing it to conduct.
- the transistor 54 When the transistor 54 is turned on, it draws current through light emitting diode 172 which indicates that the battery 134 is fully charged.
- the diodes 168 and 172 are preferably of different colors for ease of identification.
- test switch 74 Operation of the normally closed test switch 74 to an open position disconnects the bridge rectifier 44 from AC power enabling the control circuit 40 to switch to battery power.
- the test switch thus, tests the circuit operation and the condition of the battery 134.
- an illuminated exit sign and a control circuit that uses low power and long life light emitting diodes and that functions on AC or DC power. Furthermore, during a power shortage, when an illuminated exit sign is needed most, the light sources within the present sign flash drawing attention to itself.
- the present invention also provides means for automatically charging a battery so that the lights are illuminated at their brightest for the longest possible time during a power outage.
Abstract
Description
- The present invention relates generally to an illuminated exit sign and, in particular, to a control circuit for supplying AC and DC power to a plurality of series connected light sources in an exit sign.
- Many types of emergency exit signs are known in the art including those that operate on either AC or DC power. Exit signs of this type frequently require two sets of illuminating lamps, one set for AC operation and a second set for DC operation. Many of the known emergency exit signs use incandescent light bulbs as an illuminating source which use a comparatively high amount of power, thus draining a battery rapidly during DC operation. Also, incandescent light bulbs have a tendency to burn out and must be replaced periodically, adding maintenance costs to the overall cost of the exit sign.
- It would be an improvement over the prior art exit signs to provide a single illuminating source for both AC and DC operation which consumes relatively little power and which has a comparatively long life so that it requires infrequent replacement.
- It is an object of the present invention to provide a highly visible emergency exit sign which requires infrequent maintenance.
- It is another object of the present invention to provide a highly visible emergency exit sign which requires infrequent maintenance.
- It is another object of the present invention to provide an exit sign control circuit that automatically charges a battery during AC operation and that, upon power failure, switches to DC operation and increases the visibility of its display.
- The above objects are inventively achieved in an emergency exit sign and control circuit having light sources, which are preferably light emitting diodes, connected in a plurality of series combinations each having a predetermined number of light sources. The series combinations are connected in parallel across the output of the control circuit. The control circuit applies continuous power to the light sources during AC operation and charges a battery when required. An indicator on the exit sign shows the charging state of the battery. When a power failure occurs, the control circuit pulses battery power to the light sources causing the illuminated display to flash. Battery power is continued until the battery reaches a predetermined minimum voltage, at which time the control circuit shuts the light sources off, or until AC power is restored, when the sign will again be continuously illuminated and the battery recharged.
- The present device thus provides an illuminated exit sign preferably using light emitting diodes which provide improved visibility, use low power for longer DC operation, and have a longer life for infrequent replacement. By connecting the light emitting diodes in series combinations, a correct voltage drop may be supplied across each light emitting diode without using series resistors. The elimination of series resistors from the device reduces power consumption and improves visibility of the exit sign. The present invention, thus, provides an improved exit sign having many features distinguishable over the prior art.
-
- Figure 1 is a perspective view of an emergency exit sign embodying the principles of the present invention.
- Figure 2 is a rear elevational view of a display portion of the exit sign of Figure 1, including connections for light emitting diodes in series combinations of three.
- Figure 3 is an electrical diagram showing three series connected light emitting diodes.
- Figure 4 is an electrical diagram showing two series connected light emitting diodes.
- Figure 5 is an electrical diagram showing six series connected light emitting diodes.
- Figure 6 is a circuit diagram of a control circuit for use in the emergency exit sign of Figure 1.
- In Figure 1, an illuminated emergency exit sign is shown generally at 10 having a
housing 12 and adisplay board 14 with the word "EXIT" marked thereon at 16 and arrows pointing in opposed directions at 18. Asecond display board 14 substantially identical to the first may be mounted in the other side of thehousing 12. - Figure 2 shows a rear view of the
display board 14 of Figure 1 havingconnections 20 for a plurality of light emitting diodes (LEDs). Theconnections 20 are arranged to spell the word "EXIT" 16 and to form thearrows 18. For purpose of illustration, anLED 22 is shown in dotted outline connected at connectingpoints display board 14 includes first andsecond power connections LEDs 22 of theexit sign 10. By examination of Figure 2, it can be seen that theLED connections 20 are linked in series combinations of three throughout thedisplay board 14 and that each series combination is connected in parallel across thepower connections - Figure 3 shows a
series combinations 32 of threelight emitting diodes 22 for use in thedisplay board 14 of Figure 2. A forward voltage drop of 2.1 volts is required across each of theLEDs 22 for proper operation. Thus, the voltage drop required across thecombination 32 of Figure 3 is 6.3 volts. Since thedisplay board 14 of Figure 2 includes only theseries combinations 32 of threeLEDs 22, 6.3 volts must be applied across thepower connection points - Figure 4 shows two
light emitting diodes 22 connected in a series combination 34 which may be used in place of the threelight emitting diodes 22 of Figure 3. The voltage required for application across the combination 34 of Figure 4 is 4.2 volts, therefore, should thedisplay board 14 of Figure 2 be arranged in such a way as to include onlyLEDs 22 in series combinations 34 of two, a 4.2 volt power supply would be required atpower connecting points - Similarly, Figure 5 shows six series connected
light emitting diodes 22. For proper operation, a 12.6 volt power supply must be applied across a combination 36 of Figure 5. Therefore, if thedisplay board 14 of Figure 2 were arranged to include onlylight emitting diodes 22 in series combinations 36 of six, a 12.6 volt power supply must be applied to theleads - Figure 6 shows a control circuit 40 for applying power to the
display board 14 of Figure 2. The control circuit 40 includes atransformer 42, abridge rectifier 44, acomparator 46, a multi-vibrator 48, avoltage regulator 50, andtransistors leads transformer 42 producing, in a preferred embodiment, a 10 volt AC signal atoutputs transformer 42. The 10 volt AC signal is applied throughtest switch 74, the importance of which will be discussed hereinafter, toinputs bridge rectifier 44. A full wave rectified signal appears atrectifier outputs 80 and 82 which is applied through resistor 84 to thevoltage regulator 50 at aninput 88. Thevoltage regulator 50 of a preferred embodiment is a 5 volt regulator and has aground connection 90 and anoutput 92. Theground connection 90 is connected to circuit ground through three series connecteddiodes regulator 50 being raised by 6.3 volts, or the sum of the 2.1 volt drop across each of thediodes diode 100 to thepower connections display board 14 shown in Figure 2. - The full wave rectified signal is fed through
resistor 102 and filtered bycapacitor 104 to produce an essentially DC signal. The DC signal is divided byvoltage divider resistors 106 and 108 and applied throughresistor 110 tobase 112 of thetransistor 52. The application of power to thebase 112 oftransistor 52 causes thetransistor 52 to begin conducting, which acts throughresistor 114 to pullpin 116 of thecomparator 46 below a threshold level. Theresistors pin 116 above the threshold level, which in a preferred embodiment is 5.85 volts. Pulling the voltage apin 116 below the threshold level results in a low state being produced atpin 122 of thecomparator 46. The low is applied throughresistor 124 tobase 126 of the transistor 56 to cause the transistor 56 to assume a non-conducting state. - If AC power is interrupted, the
transistor 52 will cease conducting and allow the voltage at thepin 116 of thecomparator 46 to rise above the threshold level which will result in a high signal at thepin 122 of thecomparator 46. The high signal at thepin 122 is applied through theresistor 124 to thebase 126 of the transistor 56, causing the transistor 56 to commence conducting and draw current throughresistors voltage divider resistors base 132 of thetransistor 58 so thattransistor 58 is turned on which causes voltage frombattery 134 to be applied topins pins output 140 of the timer 48 to oscillate. The oscillating signal is applied tobase 142 of the transistor 60 throughresistor 144. Consequently, the transistor 60 switches on and off at the timer oscillation rate. The switching of transistor 60 operates throughresistors transistor 62 likewise to switch on and off at the timer oscillation rate. Each time thetransistor 62 is switched on, it applies voltage from thebattery 134 to the power leads 28 and 30 of thedisplay board 14, and each time the transistor is switched off, the battery voltage is disconnected from the power leads 28 and 30. Therefore, interruption of AC line power to the circuit results in theLEDs 22 in theexit sign 10 flashing at the oscillation rate of the timer 48. - As the
transistor 58 begins conducting, battery voltage is also applied throughdiode 150 to pin 152 of thecomparator 46.Capacitor 154 is of sufficiently high capacitance value to enable thepin 152 to remain high. - Should AC power remain off for a long period of time and the battery voltage drop below the threshold set at the
pin 116 of thecomparator 46, thepin 122 will assume a low state, cutting off the transistor 56 and in turn cutting off thetransistor 58. This has the effect of disconnecting thebattery 134 from thepower connections - Should AC line power resume, the
transistor 52 again is turned on which results in power being supplied to the load as described above.Pin 156 of thecomparator 46 senses the battery voltage during AC power throughresistors capacitor 162. Hysteresis is built into thecomparator 46 by the provision of feedback to thepin 156 so that upper and lower threshold levels are established for sensing battery voltage. When thepin 156 reaches the lower threshold limit, indicating that thebattery 134 voltage is low, a low state is produced onpin 164 of thecomparator 46, and when thepin 156 reaches the higher threshold limit, indicating that thebattery 134 is fully charged, a high signal is produced on thepin 164. A low state at thepin 164 turns on thetransistor 64 which applies charging current to thebattery 134 throughdiode 166. A low state on thepin 164 also draws current throughdiode 168, which is a light emitting diode, indicating that the battery is charging. - As the
battery 134 charges it will eventually become fully charged causing thepin 156 to reach the upper threshold limit which produces a high state atpin 164. The high state at thepin 164 turns off thetransistor 64 and thelight emitting diode 168 and applies a high signal to base 170 of thetransistor 54, causing it to conduct. When thetransistor 54 is turned on, it draws current throughlight emitting diode 172 which indicates that thebattery 134 is fully charged. Thediodes - Operation of the normally closed
test switch 74 to an open position disconnects thebridge rectifier 44 from AC power enabling the control circuit 40 to switch to battery power. The test switch, thus, tests the circuit operation and the condition of thebattery 134. - Thus, there has been shown and described an illuminated exit sign and a control circuit that uses low power and long life light emitting diodes and that functions on AC or DC power. Furthermore, during a power shortage, when an illuminated exit sign is needed most, the light sources within the present sign flash drawing attention to itself. The present invention also provides means for automatically charging a battery so that the lights are illuminated at their brightest for the longest possible time during a power outage.
- As is apparent from the foregoing specification, the invention is susceptible of being embodied with various alterations and modifications which may differ particularly from those that have been described in the preceding specification and description. It should be understood that I wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of my contribution to the art.
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US74981385A | 1985-06-28 | 1985-06-28 | |
US749813 | 1985-06-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0209269A2 true EP0209269A2 (en) | 1987-01-21 |
EP0209269A3 EP0209269A3 (en) | 1989-01-11 |
Family
ID=25015306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86304861A Withdrawn EP0209269A3 (en) | 1985-06-28 | 1986-06-24 | Emergency sign |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0209269A3 (en) |
JP (1) | JPH07114151B2 (en) |
CA (1) | CA1250972A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201558A (en) * | 1987-02-24 | 1988-09-01 | Polynesie Francaise | Generator for the production of electrical energy particularly from solar energy |
WO1990014647A1 (en) * | 1989-05-24 | 1990-11-29 | Bay Industrial & Mine Tech Inc. | Portable safety device for attracting visual attention |
US5220739A (en) * | 1991-06-06 | 1993-06-22 | Dci Marketing, Inc. | Merchandise accentuator |
GB2271228A (en) * | 1992-10-01 | 1994-04-06 | Fps Power Systems Oy Ab | Controlling charging of a battery in an uninterruptible power supply |
GB2318001A (en) * | 1996-10-07 | 1998-04-08 | Nec Corp | Power supply switching circuit; battery protection |
FR2831980A1 (en) * | 2001-11-08 | 2003-05-09 | Airbus France | METHOD FOR MANAGING A LUMINOUS INFORMATION DEVICE AND DEVICE USING THE SAME, IN PARTICULAR IN THE AVIONIC DOMAIN |
FR2831979A1 (en) * | 2001-11-08 | 2003-05-09 | Airbus France | LUMINOUS INFORMATION DEVICE CONCERNING THE OPERATING STATE OF A SYSTEM AND METHOD FOR MANAGING SUCH A DEVICE, IN PARTICULAR IN THE AVIONIC DOMAIN |
US6859145B2 (en) | 2003-04-03 | 2005-02-22 | Scott Wilker | Safety system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2078839A1 (en) * | 1991-09-25 | 1993-03-26 | Marc Hoffman | Double refraction and total reflection solid nonimaging lens |
US6570505B1 (en) | 1997-12-30 | 2003-05-27 | Gelcore Llc | LED lamp with a fault-indicating impedance-changing circuit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4283657A (en) * | 1976-03-25 | 1981-08-11 | Lampiridae Associates | Exit illuminating system |
US4298869A (en) * | 1978-06-29 | 1981-11-03 | Zaidan Hojin Handotai Kenkyu Shinkokai | Light-emitting diode display |
WO1982001436A1 (en) * | 1980-10-17 | 1982-04-29 | Karl L Edstroem | A system for indicating an emergency exit |
US4384317A (en) * | 1979-11-01 | 1983-05-17 | John R. Hart | Solar powered lighting system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS492273U (en) * | 1972-04-06 | 1974-01-10 | ||
JPS50154096A (en) * | 1974-05-31 | 1975-12-11 | ||
JPS52138634A (en) * | 1976-05-15 | 1977-11-18 | Matsushita Electric Works Ltd | Battery checker for emergency lamp |
JPS5820270B2 (en) * | 1977-07-25 | 1983-04-22 | 株式会社林原生物化学研究所 | How to make kurkan |
JPS5653551A (en) * | 1979-10-03 | 1981-05-13 | Toshiba Electric Equip | Battery charger |
JPS57112405U (en) * | 1980-12-29 | 1982-07-12 |
-
1986
- 1986-01-08 CA CA000499221A patent/CA1250972A/en not_active Expired
- 1986-06-24 EP EP86304861A patent/EP0209269A3/en not_active Withdrawn
- 1986-06-27 JP JP61151302A patent/JPH07114151B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4283657A (en) * | 1976-03-25 | 1981-08-11 | Lampiridae Associates | Exit illuminating system |
US4298869A (en) * | 1978-06-29 | 1981-11-03 | Zaidan Hojin Handotai Kenkyu Shinkokai | Light-emitting diode display |
US4384317A (en) * | 1979-11-01 | 1983-05-17 | John R. Hart | Solar powered lighting system |
US4384317B1 (en) * | 1979-11-01 | 1999-07-13 | Flex O Lite Inc | Solar powered lighting system |
WO1982001436A1 (en) * | 1980-10-17 | 1982-04-29 | Karl L Edstroem | A system for indicating an emergency exit |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201558A (en) * | 1987-02-24 | 1988-09-01 | Polynesie Francaise | Generator for the production of electrical energy particularly from solar energy |
GB2201558B (en) * | 1987-02-24 | 1991-07-03 | Polynesie Francaise | Generator for the production of electrical energy particularly from solar energy |
WO1990014647A1 (en) * | 1989-05-24 | 1990-11-29 | Bay Industrial & Mine Tech Inc. | Portable safety device for attracting visual attention |
US5220739A (en) * | 1991-06-06 | 1993-06-22 | Dci Marketing, Inc. | Merchandise accentuator |
GB2271228A (en) * | 1992-10-01 | 1994-04-06 | Fps Power Systems Oy Ab | Controlling charging of a battery in an uninterruptible power supply |
GB2318001B (en) * | 1996-10-07 | 2000-10-11 | Nec Corp | Power supply switching circuit with protection function |
GB2318001A (en) * | 1996-10-07 | 1998-04-08 | Nec Corp | Power supply switching circuit; battery protection |
FR2831980A1 (en) * | 2001-11-08 | 2003-05-09 | Airbus France | METHOD FOR MANAGING A LUMINOUS INFORMATION DEVICE AND DEVICE USING THE SAME, IN PARTICULAR IN THE AVIONIC DOMAIN |
FR2831979A1 (en) * | 2001-11-08 | 2003-05-09 | Airbus France | LUMINOUS INFORMATION DEVICE CONCERNING THE OPERATING STATE OF A SYSTEM AND METHOD FOR MANAGING SUCH A DEVICE, IN PARTICULAR IN THE AVIONIC DOMAIN |
EP1315404A1 (en) * | 2001-11-08 | 2003-05-28 | Airbus France | Illuminated display device for displaying the operating state of a system, in particular for avionics |
EP1315405A1 (en) * | 2001-11-08 | 2003-05-28 | Airbus France | Method of managing a display device for airplane |
US6885297B2 (en) | 2001-11-08 | 2005-04-26 | Airbus France | Process for management of a light signaling device, and a device using this process, particularly for avionics |
US6917164B2 (en) | 2001-11-08 | 2005-07-12 | Airbus France | Light signaling device related to the operating state of a system |
US6859145B2 (en) | 2003-04-03 | 2005-02-22 | Scott Wilker | Safety system |
Also Published As
Publication number | Publication date |
---|---|
JPS6210899A (en) | 1987-01-19 |
CA1250972A (en) | 1989-03-07 |
EP0209269A3 (en) | 1989-01-11 |
JPH07114151B2 (en) | 1995-12-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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