GB705523A - Improvements relating to microphones - Google Patents

Improvements relating to microphones

Info

Publication number
GB705523A
GB705523A GB2385351A GB2385351A GB705523A GB 705523 A GB705523 A GB 705523A GB 2385351 A GB2385351 A GB 2385351A GB 2385351 A GB2385351 A GB 2385351A GB 705523 A GB705523 A GB 705523A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
granule
front electrode
granule chamber
electrodes
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
GB2385351A
Inventor
Ronald Ernest Charles Brown
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 Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB1812752A priority Critical patent/GB705549A/en
Priority to GB2385351A priority patent/GB705523A/en
Publication of GB705523A publication Critical patent/GB705523A/en
Expired legal-status Critical Current

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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

705,523. Microphones. SIEMENS BROS. & CO., Ltd. July 17, 1952 [Oct. 12, 1951], No. 23853/51. Class 40 (4) The casing of a carbon granule microphone comprises a cylindrical outer part 1, which has a flange 2 supporting the diaphragm 8 and is bonded by insulating material 7, such as a thermoplastic, to a cup-shaped inner part 3 which forms the wall of the granule chamber and supports on its base the back electrode 17. A hemispherical front electrode 9 fits into an aperture in the centre of the diaphragm 8, and the only opening into the granule chamber is closed by the front electrode, the diaphragm, and washers 22, 23. The electrical paths between the wall of the granule chamber and the front electrode are long compared with the shortest direct paths between the two electrodes in order to minimise leakage. Each part 1, 3 of the casing has a lug such as 26 formed integrally with it to enable connection to be made to the electrodes, the lug connecting with the inner part 3 being insulated from the outer part 1. A guard plate 13 and cover plate 14 are provided with staggered perforations. The granule chamber is airtight and watertight, and excessive distortion of the diaphragm due to low ambient pressure may be prevented by a pillar 16 secured to the guard plate 13. This feature is claimed in Specification 705,549.
GB2385351A 1951-10-12 1951-10-12 Improvements relating to microphones Expired GB705523A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1812752A GB705549A (en) 1951-10-12 1951-10-12 Improvements relating to microphones
GB2385351A GB705523A (en) 1951-10-12 1951-10-12 Improvements relating to microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2385351A GB705523A (en) 1951-10-12 1951-10-12 Improvements relating to microphones

Publications (1)

Publication Number Publication Date
GB705523A true GB705523A (en) 1954-03-17

Family

ID=10202373

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1812752A Expired GB705549A (en) 1951-10-12 1951-10-12 Improvements relating to microphones
GB2385351A Expired GB705523A (en) 1951-10-12 1951-10-12 Improvements relating to microphones

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1812752A Expired GB705549A (en) 1951-10-12 1951-10-12 Improvements relating to microphones

Country Status (1)

Country Link
GB (2) GB705549A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995125A (en) * 1975-06-30 1976-11-30 Wheelock Signals, Inc. Protective grille

Also Published As

Publication number Publication date
GB705549A (en) 1954-03-17

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