BG20417A4 - - Google Patents
Info
- Publication number
- BG20417A4 BG20417A4 BG20269A BG2026972A BG20417A4 BG 20417 A4 BG20417 A4 BG 20417A4 BG 20269 A BG20269 A BG 20269A BG 2026972 A BG2026972 A BG 2026972A BG 20417 A4 BG20417 A4 BG 20417A4
- Authority
- BG
- Bulgaria
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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2119911A DE2119911B2 (de) | 1971-04-23 | 1971-04-23 | Elektroakustischer Wandler, insbe sondere Mikrofon fur Fernsprechanlagen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BG20417A4 true BG20417A4 (xx) | 1975-11-05 |
Family
ID=5805699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BG20269A BG20417A4 (xx) | 1971-04-23 | 1972-04-20 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3798392A (xx) |
| BE (1) | BE782498R (xx) |
| BG (1) | BG20417A4 (xx) |
| DE (1) | DE2119911B2 (xx) |
| FR (1) | FR2134023B2 (xx) |
| GB (1) | GB1350023A (xx) |
| IT (1) | IT1018506B (xx) |
| LU (1) | LU65209A1 (xx) |
| SE (1) | SE367752B (xx) |
| ZA (1) | ZA722575B (xx) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1032479A (en) * | 1974-09-16 | 1978-06-06 | Rudolf Gorike | Headphone |
| DE2937922A1 (de) * | 1979-09-19 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | Piezoelektrischer wandler |
| WO2014061584A1 (ja) * | 2012-10-15 | 2014-04-24 | Ｎｅｃカシオモバイルコミュニケーションズ株式会社 | 電気音響変換器、その製造方法、及びその電気音響変換器を用いた電子機器 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE88657C (xx) * | ||||
| US1757938A (en) * | 1925-04-13 | 1930-05-06 | Harvey C Hayes | Acoustic instrument |
| FR1084139A (fr) * | 1952-10-06 | 1955-01-17 | Microphone à condensateur pour réception directionnelle | |
| US2921993A (en) * | 1955-10-04 | 1960-01-19 | Electro Voice | Pressure gradient noise canceling microphone |
| US3206558A (en) * | 1961-09-22 | 1965-09-14 | Erie Technological Prod Inc | Microphone |
| DE1226647B (de) * | 1965-03-22 | 1966-10-13 | Siemens Ag | Elektroakustischer Wandler |
| BE759888A (fr) * | 1969-12-05 | 1971-06-04 | Siemens Ag | Transducteur electro-acoustique, notamment microphone pour installations telephoniques |
-
1971
- 1971-04-23 DE DE2119911A patent/DE2119911B2/de not_active Withdrawn
-
1972
- 1972-04-05 GB GB1556772A patent/GB1350023A/en not_active Expired
- 1972-04-17 ZA ZA722575A patent/ZA722575B/xx unknown
- 1972-04-18 US US00245105A patent/US3798392A/en not_active Expired - Lifetime
- 1972-04-20 BG BG20269A patent/BG20417A4/xx unknown
- 1972-04-21 FR FR7214194A patent/FR2134023B2/fr not_active Expired
- 1972-04-21 LU LU65209D patent/LU65209A1/xx unknown
- 1972-04-21 IT IT7322/72A patent/IT1018506B/it active
- 1972-04-21 BE BE782498A patent/BE782498R/xx active
- 1972-04-24 SE SE05378/72A patent/SE367752B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE367752B (xx) | 1974-06-04 |
| ZA722575B (en) | 1973-01-31 |
| LU65209A1 (xx) | 1972-07-13 |
| FR2134023A2 (xx) | 1972-12-01 |
| DE2119911B2 (de) | 1973-11-15 |
| FR2134023B2 (xx) | 1978-03-03 |
| BE782498R (fr) | 1972-10-23 |
| GB1350023A (en) | 1974-04-18 |
| IT1018506B (it) | 1977-10-20 |
| DE2119911A1 (de) | 1972-11-02 |
| US3798392A (en) | 1974-03-19 |