GB257563A - Improvements in or relating to appliances for persons with defective hearing - Google Patents

Improvements in or relating to appliances for persons with defective hearing

Info

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
Application number
GB22184/25A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB257563A publication Critical patent/GB257563A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/02Transducers 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.
GB22184/25A 1925-08-27 1925-09-04 Improvements in or relating to appliances for persons with defective hearing Expired GB257563A (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
US1709747A (en) 1929-04-16
DE460940C (en) 1928-06-12
FR604032A (en) 1926-04-28

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