CA2033580C - Hearing aid - Google Patents
Hearing aid Download PDFInfo
- Publication number
- CA2033580C CA2033580C CA002033580A CA2033580A CA2033580C CA 2033580 C CA2033580 C CA 2033580C CA 002033580 A CA002033580 A CA 002033580A CA 2033580 A CA2033580 A CA 2033580A CA 2033580 C CA2033580 C CA 2033580C
- Authority
- CA
- Canada
- Prior art keywords
- sound
- hearing aid
- tube
- user
- acoustic
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
- H04R25/456—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback mechanically
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
- H04R25/607—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of earhooks
Abstract
A hearing aid is disclosed in which the outside sound collected by a microphone is amplified and radiated from the earphone unit so as to be conducted to the user's external auditory meatus. The auditory tube is of an inside diameter approximately equal to that of the user's external auditory meatus and has one end arranged as a section for attachment to the user's auricle and the other end arranged as a reflectionless terminal. The earphone unit is mounted on the peripheral surface of the auditory tube with the sound radiating surface facing the inside of the tube.
Description
~:~~s~ ir.~ ~C~ ~~
SPECIFICATION
TITLE OF THE INVENTION
Hearing Aid BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a hearing aid.
Prior Art The hearing aid is so designed that outside sounds, such as the voice, are converted by a microphone into electrical signals which are amplified by an amplifier and supplied to an earphone after correction of the frequency characteristics thereof in accordance with the characteristics of the user's auditory sense, and the thus corrected voice output is supplied from the earphone to the user's external auditory meatus.
Most of the prior-art hearing aids are of the separate type consisting of a main body provided with a microphone unit and a earphone section separate from the main body. However, the separate type hearing aids are not in popular use because they are difficult to handle and cannot be used without being noticed by a third person. Recently, with miniaturization of components, brought about with the progress in the production technology, a unitary type hearing aid, in which the microphone unit, earphone un i t , ampl i f i a r and the sto rage batte ry a re accommodated i n a main body, has been presented to the market.
In general, the hearing aid is attached to the user's ~Q~3~~~
auricle, with the earphone stopping up the external auditory meatus. The user of the hearing aid may hear the sound output emanating from the attached earphone unit as the voice by such sound output reaching the tympanic membrane by way of the external auditory meatus and vibrating the tympanic membrane.
Since the conventional hearing aid is attached to the user's auricle, with the earphone stopping up the external auditory meatus, the sound signal reaching the user's tympanic membrane is reflected thereat to return to the earphone unit by way of the external auditory meatus so as to be reflected by the diaphragm or the housing of the earphone unit to proceed again towards the tympanic membrane. In this manner, both the sound directly emanati ng f rom the earphone uni t and the sound emanati ng f rom the earphone unit and reflected by the tympanic membrane and the earphone unit reach the tympanic membrane. With such conventional hearing aid, in which both the sound directly emanating from the earphone unit and the reflected sound reach the user's tympanic membrane, the user may be fatigued as he feels oppressed or as if the sound source were located within his or her own head. In addition, because of the presence of the reflected sound, it has been difficult to carry out a suitable correcting operation for the voice output by an electrical circuit.
On the other hand, the unitary type hearing aid is liable to howling and unstable operation, because the microphone unit and the earphone unit are mounted close to each other. Besides, the outside noise tends to be intruded to render it difficult for the user to hear the desired sound.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a hearing aid whereby the voice output may be corrected in accordance with characteristics of the user's auditory sense.
It is another object of the present invention to provide a hearing aid whereby the user does not feel oppressed or as if the sound source were located within the user's own head.
It is still another object of the present invention to provide a unitary type hearing aid in which the microphone unit and the earphone unit are mounted close to each other, wherein a sufficient howling margin may be assured to provide for a stable operation.
It is yet another object of the present invention to provide . a uriitary type hearing aid whereby the outside noise may hardly be intruded and the desired sound may be heard easily.
In accordance with the present invention, there is provided a hearing aid comprising an acoustic tube having an inside diameter about equal to the inside diameter of the user's external auditory meatus, and having its one end arrayed as a section for attachment to the user's auricle and its other end arranged as the terminal where no sound reflection may occur, a microphone unit for converting the outside sound into electrical ~~~~~8 signals, an earphone unit mounted on the peripheral surface of said acoustic tube with its sound radiating surface facing the inside of the acoustic tube, and an amplifier for amplifying electrical signals outputted from said microphone unit and supplying the amplified signals to said earphone unit.
With the hearing aid of the present invention, the outside voice sound is converted by the microphone unit into electrical signals which are amplified by the amplifier and supplied to the earphone unit. The earphone unit transmits the voice output corresponding to these electrical signals and hence to the outside voice signal to the external auditory meatus by way of the acoustic tube.
The acoustic tube is of an inside diameter approximately equa'1 to the external auditory meatus and thus functions as an acoustic duct having the same acoustic impedance as that of the external acoustic meatus. On the other hand, since the acoustic tube has one end formed as the attachment section for attaching the hearing aid at the user's auricle and the other end as the terminal free from sound reflection, there is no risk that the sound once reflected by the tympanic membrane be again reflected towards the tympanic membrane.
In accordance with the present invention, the voice output from the earphone unit is transmitted to the external auditory meatus by way of the acousti c tube , so that the voi ce output f rom the earphone unit reaches the tympanic membrane by way of an 2~3~~~
acoustic duct having a constant acoustic impedance. Since there is no risk that the sound once reflected by the tympanic membrane be reflected at the terminal of the acoustic tube to be again transmitted to the external auditory meatus, the user feels that the sound source is at a fixed position without feeling oppressed or as if the sound source were within his or her own head. The hearing aid of the present invention is stable in acoustic characteristics and free from sound reflection, because the acoustic tube is attached at the user's auricle in a constant state at all times by means of the attachment section at one end of the tube and functions as the acoustic duct having the same acoustic impedance as that of the external acoustic meatus. The voice output may be corrected in accordance with characteristics of the user's auditory sense by adjusting the amplifier characteristics. In addition, since the earphone unit is mounted within the inside of the acoustic tube, the hearing aid is of the unitary type capable of performing a stable operation with an enlarged howling margin, in which the outside noise may hardly be intruded and solely the desired sound may be heard easily.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block diagram showing the basic structure of a hearing aid according to the present invention, with an annexed electrical circuit.
Fig. 2 is a perspective view showing the hearing aid according to the present invention.
~~~~~~~J
DESCRIPTION OF PREFERRED EMBODIMENT
By referring to the drawings, a preferred embodiment of the hearing aid according to the present invention will be explained in detail.
Referring to Fig. 1, showing a basic structure of the hearing according to the present invention, the bearing aid shown therein has a main body 10 including an acoustic tube 1, on earphone unit 2 attached to the peripheral surface of the acoustic tube 1 with a sound radiating surface 2a thereof facing the inside of the tube 1, a microphone unit 3 for converting the outside sound of the acoustic sound 1 into electrical signals, and an amplifier 4 for amplifying electrical signals outputted from the microphone unit 3 and supplying the amplified signals to the earphone unit 2. °--The main body 10 of the hearing aid is also provided with a variable resistance or adjustment volume 5 for variably setting the characteristics of the amplifier 4 for adjusting the sound quality, an operating knob 5a for the adjustment volume 5, a battery 6 as a driving electrical source, a power source switch 7 and an operating knob 7a for the switch 7.
Referring to Fig. 2, the acoustic tube 1 may be flexed along . the contour of an auricle D so as to function as an ear hanger . led out from the main body 10 which is arranged at back of the auricle D.
As shown in the schematics of Fig. 1, the acoustic tube 1 2~~~~~
has a uniform inside diameter W approximately equal to the inside diameter W~ of the external auditory meatus A. The acoustic tube 1 is in the form of an elongate tube having the uniform inside diameter W, one open end 1a of which is provided with an attachment section 8 for attachment to the auricle D and the other open end 1b of which is formed as a terminal where sound reflection is precluded.
The attachment section 8 for attachment to the auricle D is formed as a flexible piece of synthetic resin material having an end section of reduced thickness which is inserted into and attached to an entrance C of the external auditory meatus A.
The inside diameter W~ of the attachment section 8 is selected to be equal to the inside diameter W of the auditory tube 1, that is, approximately equal to the inside diameter WD
of the external auditory meatus A.
The earphone unit 2 is mounted on the acoustic tube 1 with its sound radiating surface 2a substantially flush with the inner peripheral surface of the tube 1 and facing the inside of the tube 1. With the sound radiating surface 2a substantially flush with the inner peripheral surface of the acoustic tube 1, the earphone uni t 2 i s mounted on the acousti c tube 1 wi thout the risk of disturbing the acoustic impedance characteristics of the acoustic tube 1.
With the acoustic tube 1 is mounted in position, with the foremost part of the attachment section 8 introduced into the 2~~~~8~
entrance C to the external auditory meatus A, the acoustic tube 1 provides a sound duct having a substantially constant inside diameter from a tympanic membrane B in the external auditory meatus A to the opposi to openi ng end 1 b as the ref 1 ecti onl ess terminal of the acoustic tube 1 and thus exhibiting a constant acoustic impedance.
Thus the voice output from the earphone unit 2 is not reflected when propagated towards the external auditory meatus A by way of the acoustic tube 1, while the sound reflected back at 'the tympanic membrane B is also not reflected when propagated from the external acoustic meatus A towards the acoustic tube 1.
In addition, since the opposite side opening 1b of the acoustic tube 1 is formed as the terminal where sound reflection is precluded, there is no possibility that the voice output propagated from the earphone unit 2 towards the acoustic tube 1 or the reflected sound propagated from the external auditory meatus A be reflected at the opposite side opening 1b. Hence, there is no possibility that the sound reflected at the tympanic membrane B be reflected back at the earphone unit 2 to be propagated back towards the external auditory meatus A.
With the above described hearing aid, since the reflected sound at the tympanic membrane B is not reflected at the earphone unit 2 so as to be propagated back towards the external auditory meatus A, the sense of the location of the sound source may be clearer, such that the user is free from fatigue or oppression 2~~~a~~i~
or the sense of a stationary sound source caused by sound reflection. On the other hand, extremely stable acoustic characteristics may be achieved since the acoustic tube 1 is attached to the user's auricle D in the same state at all times by means of the attachment section 8 at the one end side for functioning as the sound duct having the same acoustic impedance as that of the external acoustic meatus A. Besides, since there occurs no sound reflection, as mentioned previously, the voice output may be suitably corrected in accordance with acoustic characteristics of the user's auditory sense by operating the adjustment volume 5 for variably setting the characteristics of the amplifier 4 and thereby suitably adjusting the sound quality.
The earphone unit 2 is arranged within the inside of the acoustic tube 1 for improving howling margin to assure a stable operation.
On the other hand, the desired sound may be heard more easily, inasmuch as the sound from outside can hardly be intruded and the wider dynamic range may be achieved.
SPECIFICATION
TITLE OF THE INVENTION
Hearing Aid BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a hearing aid.
Prior Art The hearing aid is so designed that outside sounds, such as the voice, are converted by a microphone into electrical signals which are amplified by an amplifier and supplied to an earphone after correction of the frequency characteristics thereof in accordance with the characteristics of the user's auditory sense, and the thus corrected voice output is supplied from the earphone to the user's external auditory meatus.
Most of the prior-art hearing aids are of the separate type consisting of a main body provided with a microphone unit and a earphone section separate from the main body. However, the separate type hearing aids are not in popular use because they are difficult to handle and cannot be used without being noticed by a third person. Recently, with miniaturization of components, brought about with the progress in the production technology, a unitary type hearing aid, in which the microphone unit, earphone un i t , ampl i f i a r and the sto rage batte ry a re accommodated i n a main body, has been presented to the market.
In general, the hearing aid is attached to the user's ~Q~3~~~
auricle, with the earphone stopping up the external auditory meatus. The user of the hearing aid may hear the sound output emanating from the attached earphone unit as the voice by such sound output reaching the tympanic membrane by way of the external auditory meatus and vibrating the tympanic membrane.
Since the conventional hearing aid is attached to the user's auricle, with the earphone stopping up the external auditory meatus, the sound signal reaching the user's tympanic membrane is reflected thereat to return to the earphone unit by way of the external auditory meatus so as to be reflected by the diaphragm or the housing of the earphone unit to proceed again towards the tympanic membrane. In this manner, both the sound directly emanati ng f rom the earphone uni t and the sound emanati ng f rom the earphone unit and reflected by the tympanic membrane and the earphone unit reach the tympanic membrane. With such conventional hearing aid, in which both the sound directly emanating from the earphone unit and the reflected sound reach the user's tympanic membrane, the user may be fatigued as he feels oppressed or as if the sound source were located within his or her own head. In addition, because of the presence of the reflected sound, it has been difficult to carry out a suitable correcting operation for the voice output by an electrical circuit.
On the other hand, the unitary type hearing aid is liable to howling and unstable operation, because the microphone unit and the earphone unit are mounted close to each other. Besides, the outside noise tends to be intruded to render it difficult for the user to hear the desired sound.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a hearing aid whereby the voice output may be corrected in accordance with characteristics of the user's auditory sense.
It is another object of the present invention to provide a hearing aid whereby the user does not feel oppressed or as if the sound source were located within the user's own head.
It is still another object of the present invention to provide a unitary type hearing aid in which the microphone unit and the earphone unit are mounted close to each other, wherein a sufficient howling margin may be assured to provide for a stable operation.
It is yet another object of the present invention to provide . a uriitary type hearing aid whereby the outside noise may hardly be intruded and the desired sound may be heard easily.
In accordance with the present invention, there is provided a hearing aid comprising an acoustic tube having an inside diameter about equal to the inside diameter of the user's external auditory meatus, and having its one end arrayed as a section for attachment to the user's auricle and its other end arranged as the terminal where no sound reflection may occur, a microphone unit for converting the outside sound into electrical ~~~~~8 signals, an earphone unit mounted on the peripheral surface of said acoustic tube with its sound radiating surface facing the inside of the acoustic tube, and an amplifier for amplifying electrical signals outputted from said microphone unit and supplying the amplified signals to said earphone unit.
With the hearing aid of the present invention, the outside voice sound is converted by the microphone unit into electrical signals which are amplified by the amplifier and supplied to the earphone unit. The earphone unit transmits the voice output corresponding to these electrical signals and hence to the outside voice signal to the external auditory meatus by way of the acoustic tube.
The acoustic tube is of an inside diameter approximately equa'1 to the external auditory meatus and thus functions as an acoustic duct having the same acoustic impedance as that of the external acoustic meatus. On the other hand, since the acoustic tube has one end formed as the attachment section for attaching the hearing aid at the user's auricle and the other end as the terminal free from sound reflection, there is no risk that the sound once reflected by the tympanic membrane be again reflected towards the tympanic membrane.
In accordance with the present invention, the voice output from the earphone unit is transmitted to the external auditory meatus by way of the acousti c tube , so that the voi ce output f rom the earphone unit reaches the tympanic membrane by way of an 2~3~~~
acoustic duct having a constant acoustic impedance. Since there is no risk that the sound once reflected by the tympanic membrane be reflected at the terminal of the acoustic tube to be again transmitted to the external auditory meatus, the user feels that the sound source is at a fixed position without feeling oppressed or as if the sound source were within his or her own head. The hearing aid of the present invention is stable in acoustic characteristics and free from sound reflection, because the acoustic tube is attached at the user's auricle in a constant state at all times by means of the attachment section at one end of the tube and functions as the acoustic duct having the same acoustic impedance as that of the external acoustic meatus. The voice output may be corrected in accordance with characteristics of the user's auditory sense by adjusting the amplifier characteristics. In addition, since the earphone unit is mounted within the inside of the acoustic tube, the hearing aid is of the unitary type capable of performing a stable operation with an enlarged howling margin, in which the outside noise may hardly be intruded and solely the desired sound may be heard easily.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block diagram showing the basic structure of a hearing aid according to the present invention, with an annexed electrical circuit.
Fig. 2 is a perspective view showing the hearing aid according to the present invention.
~~~~~~~J
DESCRIPTION OF PREFERRED EMBODIMENT
By referring to the drawings, a preferred embodiment of the hearing aid according to the present invention will be explained in detail.
Referring to Fig. 1, showing a basic structure of the hearing according to the present invention, the bearing aid shown therein has a main body 10 including an acoustic tube 1, on earphone unit 2 attached to the peripheral surface of the acoustic tube 1 with a sound radiating surface 2a thereof facing the inside of the tube 1, a microphone unit 3 for converting the outside sound of the acoustic sound 1 into electrical signals, and an amplifier 4 for amplifying electrical signals outputted from the microphone unit 3 and supplying the amplified signals to the earphone unit 2. °--The main body 10 of the hearing aid is also provided with a variable resistance or adjustment volume 5 for variably setting the characteristics of the amplifier 4 for adjusting the sound quality, an operating knob 5a for the adjustment volume 5, a battery 6 as a driving electrical source, a power source switch 7 and an operating knob 7a for the switch 7.
Referring to Fig. 2, the acoustic tube 1 may be flexed along . the contour of an auricle D so as to function as an ear hanger . led out from the main body 10 which is arranged at back of the auricle D.
As shown in the schematics of Fig. 1, the acoustic tube 1 2~~~~~
has a uniform inside diameter W approximately equal to the inside diameter W~ of the external auditory meatus A. The acoustic tube 1 is in the form of an elongate tube having the uniform inside diameter W, one open end 1a of which is provided with an attachment section 8 for attachment to the auricle D and the other open end 1b of which is formed as a terminal where sound reflection is precluded.
The attachment section 8 for attachment to the auricle D is formed as a flexible piece of synthetic resin material having an end section of reduced thickness which is inserted into and attached to an entrance C of the external auditory meatus A.
The inside diameter W~ of the attachment section 8 is selected to be equal to the inside diameter W of the auditory tube 1, that is, approximately equal to the inside diameter WD
of the external auditory meatus A.
The earphone unit 2 is mounted on the acoustic tube 1 with its sound radiating surface 2a substantially flush with the inner peripheral surface of the tube 1 and facing the inside of the tube 1. With the sound radiating surface 2a substantially flush with the inner peripheral surface of the acoustic tube 1, the earphone uni t 2 i s mounted on the acousti c tube 1 wi thout the risk of disturbing the acoustic impedance characteristics of the acoustic tube 1.
With the acoustic tube 1 is mounted in position, with the foremost part of the attachment section 8 introduced into the 2~~~~8~
entrance C to the external auditory meatus A, the acoustic tube 1 provides a sound duct having a substantially constant inside diameter from a tympanic membrane B in the external auditory meatus A to the opposi to openi ng end 1 b as the ref 1 ecti onl ess terminal of the acoustic tube 1 and thus exhibiting a constant acoustic impedance.
Thus the voice output from the earphone unit 2 is not reflected when propagated towards the external auditory meatus A by way of the acoustic tube 1, while the sound reflected back at 'the tympanic membrane B is also not reflected when propagated from the external acoustic meatus A towards the acoustic tube 1.
In addition, since the opposite side opening 1b of the acoustic tube 1 is formed as the terminal where sound reflection is precluded, there is no possibility that the voice output propagated from the earphone unit 2 towards the acoustic tube 1 or the reflected sound propagated from the external auditory meatus A be reflected at the opposite side opening 1b. Hence, there is no possibility that the sound reflected at the tympanic membrane B be reflected back at the earphone unit 2 to be propagated back towards the external auditory meatus A.
With the above described hearing aid, since the reflected sound at the tympanic membrane B is not reflected at the earphone unit 2 so as to be propagated back towards the external auditory meatus A, the sense of the location of the sound source may be clearer, such that the user is free from fatigue or oppression 2~~~a~~i~
or the sense of a stationary sound source caused by sound reflection. On the other hand, extremely stable acoustic characteristics may be achieved since the acoustic tube 1 is attached to the user's auricle D in the same state at all times by means of the attachment section 8 at the one end side for functioning as the sound duct having the same acoustic impedance as that of the external acoustic meatus A. Besides, since there occurs no sound reflection, as mentioned previously, the voice output may be suitably corrected in accordance with acoustic characteristics of the user's auditory sense by operating the adjustment volume 5 for variably setting the characteristics of the amplifier 4 and thereby suitably adjusting the sound quality.
The earphone unit 2 is arranged within the inside of the acoustic tube 1 for improving howling margin to assure a stable operation.
On the other hand, the desired sound may be heard more easily, inasmuch as the sound from outside can hardly be intruded and the wider dynamic range may be achieved.
Claims (5)
1) A hearing and comprising an acoustic tube having an inside diameter about equal to the inside diameter of the user's external auditory meatus, and having its one end arranged as a section for attachment to the user's auricle and its other end arranged as the terminal where sound reflection is precluded, a microphone unit for converting the outside sound into electrical signals, an earphone unit mounted on the peripheral surface of said acoustic tube with its sound radiating surface facing the inside of the acoustic tube, and an amplifier for amplifying electrical signals outputted from said microphone unit and supplying the amplified signals to said earphone unit.
2) The hearing aid according to claim 1 wherein the sound radiating surface of said earphone unit is flush with the inner surface of said auditory tube.
3) The hearing aid according to claim 2 wherein said auditory tube has a substantially uniform inside diameter from said attachment section to a reflectionless terminal section.
4) The hearing aid according to claim 2 wherein said amplifier may be operated from outside to vary its amplification factor.
5) The hearing aid according to claim 1 wherein said acoustic tube is flexible.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP001195/90 | 1990-01-12 | ||
| JP1990001195U JP2504932Y2 (en) | 1990-01-12 | 1990-01-12 | hearing aid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2033580A1 CA2033580A1 (en) | 1991-07-13 |
| CA2033580C true CA2033580C (en) | 2000-07-25 |
Family
ID=11494678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002033580A Expired - Lifetime CA2033580C (en) | 1990-01-12 | 1991-01-03 | Hearing aid |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5228089A (en) |
| EP (1) | EP0437323B1 (en) |
| JP (1) | JP2504932Y2 (en) |
| KR (1) | KR100249953B1 (en) |
| CA (1) | CA2033580C (en) |
| DE (1) | DE69109307T2 (en) |
| DK (1) | DK0437323T3 (en) |
| MY (1) | MY106359A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0879878A (en) * | 1994-09-05 | 1996-03-22 | Sony Corp | Headphone device |
| US5694475A (en) * | 1995-09-19 | 1997-12-02 | Interval Research Corporation | Acoustically transparent earphones |
| US20020197182A1 (en) * | 2001-06-22 | 2002-12-26 | Ozone Generator | Method and apparatus for directing ultrasonic energy |
| JP5246695B2 (en) * | 2008-10-03 | 2013-07-24 | リオン株式会社 | Hearing aid |
| US20100163334A1 (en) * | 2008-12-31 | 2010-07-01 | Hua David Jiang | Sound maximizing ammellescope |
| US8588880B2 (en) | 2009-02-16 | 2013-11-19 | Masimo Corporation | Ear sensor |
| KR101483042B1 (en) * | 2013-12-09 | 2015-01-19 | 지영택 | A Jointed Kite Reel with Polygonal Structure |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL278159A (en) * | 1961-05-12 | 1900-01-01 | ||
| US3757769A (en) * | 1971-11-01 | 1973-09-11 | Grason Stadler Comp Inc | Acoustic admittance testing apparatus |
| US3787643A (en) * | 1972-11-07 | 1974-01-22 | American Danish Oticon | Hearing aid device |
| DE7918029U1 (en) * | 1979-06-22 | 1980-12-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | SMALL HEATER |
| NL8400925A (en) * | 1984-03-23 | 1985-10-16 | Philips Nv | HEARING AID, IN PARTICULAR BEHIND-THE-EAR HEARING AID. |
| CA1336295C (en) * | 1988-09-21 | 1995-07-11 | Masayoshi Miura | Sound reproducing apparatus |
| EP0416155A1 (en) * | 1989-09-07 | 1991-03-13 | Siemens Aktiengesellschaft | Behind-the-ear hearing aid |
-
1990
- 1990-01-12 JP JP1990001195U patent/JP2504932Y2/en not_active Expired - Lifetime
-
1991
- 1991-01-03 CA CA002033580A patent/CA2033580C/en not_active Expired - Lifetime
- 1991-01-04 EP EP91300057A patent/EP0437323B1/en not_active Expired - Lifetime
- 1991-01-04 DE DE69109307T patent/DE69109307T2/en not_active Expired - Lifetime
- 1991-01-04 DK DK91300057.6T patent/DK0437323T3/en active
- 1991-01-09 MY MYPI91000028A patent/MY106359A/en unknown
- 1991-01-11 KR KR1019910000312A patent/KR100249953B1/en not_active IP Right Cessation
- 1991-01-14 US US07/640,830 patent/US5228089A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DK0437323T3 (en) | 1995-05-29 |
| DE69109307D1 (en) | 1995-06-08 |
| EP0437323B1 (en) | 1995-05-03 |
| KR910015190A (en) | 1991-08-31 |
| EP0437323A3 (en) | 1992-05-20 |
| KR100249953B1 (en) | 2000-03-15 |
| US5228089A (en) | 1993-07-13 |
| EP0437323A2 (en) | 1991-07-17 |
| CA2033580A1 (en) | 1991-07-13 |
| DE69109307T2 (en) | 1995-10-12 |
| MY106359A (en) | 1995-05-30 |
| JP2504932Y2 (en) | 1996-07-24 |
| JPH0392898U (en) | 1991-09-20 |
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