GB257563A - Improvements in or relating to appliances for persons with defective hearing - Google Patents
Improvements in or relating to appliances for persons with defective hearingInfo
- Publication number
- GB257563A GB257563A GB22184/25A GB2218425A GB257563A GB 257563 A GB257563 A GB 257563A GB 22184/25 A GB22184/25 A GB 22184/25A GB 2218425 A GB2218425 A GB 2218425A GB 257563 A GB257563 A GB 257563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- amplifier
- chamber
- microphone
- fine
- 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
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/02—Transducers using more than one principle simultaneously
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Telephone Set Structure (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
257,563. Siemens & Halske Akt.-Ges. Aug. 27, 1925. [Convention date]. Portable sets ; magnetomicrophonic relays ; diaphragms. - An appliance for deaf persons comprises a microphone amplifier having a fine carbon filling and a radially stretched diaphragm which is rendered insensible to sound oscillations so that it is actuated exclusively by an electromagnet system. The amplifier is located in a flat box adapted to be carried in the pocket. The amplifier has a single diaphragm, preferably of thin metal foil, with a centrally attached iron armature, which is acted upon by a magnet system, while the other side of the diaphragm bounds a microphone chamber. The granules in the microphone are fine in relation to the size of the chamber . The amplifier microphone is housed, with a transmitter microphone 1, Fig. 1, in a flat box 2 which is provided with a switch 9 and a regulating resistance 10, and contains a dry cell 3. A lead 4 connects the amplifier with the ear telephone 5. The amplifier microphone comprises a granule chamber 11, Fig. 2, formed in a block of insulating material 16 and closed by a diaphragm 12 of metal foil, preferably of phosphor bronze of a thickness of .01 mm. and gilded. The chamber, which is of a depth of a few millimeters, is filled with fine grains of carbon. The central part of the back of the chamber consists of a conducting surface 13. The diaphragm 12 is secured to a ring, preferably by soldering, and is stretched by an annular ridge 17 on the body 16. To the centre of the diaphragm is soldered a disc 14 of iron of about .2 mm. in thickness. The construction of the diaphragm, together with the granule packing, renders the diaphragm aperiodic, but a felt ring may be located in the chamber. The magnet system is provided with concentric poles, a central rod 18 and an annular plate 19 surrounding the rod 18, connected by polepieces 21, 22 respectively to the poles of a permanent magnet 20 which consists of a diametrically magnetized ring.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES71274D DE460940C (en) | 1925-08-27 | 1925-08-27 | Portable hearing aid device with amplifier arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB257563A true GB257563A (en) | 1926-12-02 |
Family
ID=5966502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22184/25A Expired GB257563A (en) | 1925-08-27 | 1925-09-04 | Improvements in or relating to appliances for persons with defective hearing |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1709747A (en) |
| DE (1) | DE460940C (en) |
| FR (1) | FR604032A (en) |
| GB (1) | GB257563A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673898A (en) * | 1951-06-01 | 1954-03-30 | Sonotone Corp | Wearable hearing aid having external microphone with penetrating pin connector structure |
| DE1114731B (en) * | 1957-10-16 | 1961-10-05 | Wasagchemie Ag | Disposable piston valve for spray fluid delivery lines |
-
1925
- 1925-08-27 DE DES71274D patent/DE460940C/en not_active Expired
- 1925-09-04 GB GB22184/25A patent/GB257563A/en not_active Expired
- 1925-09-08 FR FR604032D patent/FR604032A/en not_active Expired
-
1926
- 1926-08-19 US US130291A patent/US1709747A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR604032A (en) | 1926-04-28 |
| DE460940C (en) | 1928-06-12 |
| US1709747A (en) | 1929-04-16 |
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