GB649707A - Improvements in or relating to acoustic instruments provided with diaphragms - Google Patents
Improvements in or relating to acoustic instruments provided with diaphragmsInfo
- Publication number
- GB649707A GB649707A GB35462/46A GB3546246A GB649707A GB 649707 A GB649707 A GB 649707A GB 35462/46 A GB35462/46 A GB 35462/46A GB 3546246 A GB3546246 A GB 3546246A GB 649707 A GB649707 A GB 649707A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- passages
- bore
- instrument
- cushion
- 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
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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/10—Telephone receivers
Abstract
649,707. Sound transmitting and receiving devices. PHILIPS LAMPS, Ltd. Nov. 29, 1946, No. 35462. Convention date, Dec. 3, 1945. [Class 40 (iv)] An electrodynamic telephone instrument having an air cushion 7 between the diaphragm 2 and the magnetic system 6 has a central bore 11 in the central pole 4 of the magnet into which damping material 12 is fitted in such a manner as to create air passages 13 parallel to the bore 11 to couple the said air cushion 7 to the air chamber 14 acoustically, the number and size of the passages being such as to provide a resonance peak in the response curve towards the lower end of the audio frequency range adequately damped to extend the frequency characteristic curve towards the region of lowest frequency. A second chamber 10 is also coupled to the cushion 7 via an air gap 3 and gap 8 formed by a ring 9 of non-magnetic material to give the instrument a level characteristic over the whole speech band. Damping material of non-magnetic metal bars assembled as in Fig. 1a has been found to give satisfactory results and a coil of corrugated metal inserted axially in the bore is named as an alternative. A further embodiment, Fig. 4 (not shown), is of a pressure gradient instrument in which the ends of the passages remote from air cushion 7 are open to the atmosphere.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL649707X | 1945-12-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB649707A true GB649707A (en) | 1951-01-31 |
Family
ID=19792018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35462/46A Expired GB649707A (en) | 1945-12-03 | 1946-11-29 | Improvements in or relating to acoustic instruments provided with diaphragms |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB649707A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE952358C (en) * | 1950-11-24 | 1956-11-15 | Holmberg & Co | Electrodynamic converters such as telephones, microphones, small loudspeakers or the like. |
| DE968466C (en) * | 1952-02-23 | 1958-02-20 | Siemens Ag | Pressure chamber loudspeaker, especially with a dome membrane |
-
1946
- 1946-11-29 GB GB35462/46A patent/GB649707A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE952358C (en) * | 1950-11-24 | 1956-11-15 | Holmberg & Co | Electrodynamic converters such as telephones, microphones, small loudspeakers or the like. |
| DE968466C (en) * | 1952-02-23 | 1958-02-20 | Siemens Ag | Pressure chamber loudspeaker, especially with a dome membrane |
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