GB1329698A - Microphones - Google Patents

Microphones

Info

Publication number
GB1329698A
GB1329698A GB1329698DA GB1329698A GB 1329698 A GB1329698 A GB 1329698A GB 1329698D A GB1329698D A GB 1329698DA GB 1329698 A GB1329698 A GB 1329698A
Authority
GB
United Kingdom
Prior art keywords
chamber
vent
bag
diaphragm
felt
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
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.)
Metson G H
Original Assignee
Metson G H
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 Metson G H filed Critical Metson G H
Publication of GB1329698A publication Critical patent/GB1329698A/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
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

1329698 Microphones G H METSON 15 Dec 1970 [25 Nov 1969] 57681/69 Heading H4J A carbon microphone inset for a telephone handset comprises a cup-shaped body 11 containing a granule chamber 1 and a rim clamped diaphragm 6. A pressure equalising vent 16 is provided in the easing at the rear of the diaphragm and is closed by a flexible damp-proof bag of e.g. PVC or polythene. The cavity 18 above the vent may be filled with a felt plug. The bag may alternatively be located within the air chamber defined by casing wall 11 and inner support member 7, the vent hole in this case being located off the axis of the inset. In another alternative, a separately vented chamber is formed within the just-defined chamber and the bag is located within this separate chamber and is in communication with the vent 16 via an external passageway (Fig. 2, not shown). Granule chamber 1 is closed by a nylon plug 5 which is held in place by the felt plug in cavity 18. The lower electrode 3 is clamped between fabric washers 9, 10. An apertured guard plate 12 has its peripheral edges 13 turned over to secure it to casing 11. A flexible cover 14 protects the main diaphragm 6. Acoustic mass is provided by three apertures 21 and a felt washer 22.
GB1329698D 1969-11-25 1969-11-25 Microphones Expired GB1329698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5768169 1969-11-25

Publications (1)

Publication Number Publication Date
GB1329698A true GB1329698A (en) 1973-09-12

Family

ID=10479792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1329698D Expired GB1329698A (en) 1969-11-25 1969-11-25 Microphones

Country Status (1)

Country Link
GB (1) GB1329698A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163875A (en) * 1978-02-09 1979-08-07 Northern Telecom Limited Telephone handset with transmitter having a one piece gasket for sealing and holding of transmitter members

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163875A (en) * 1978-02-09 1979-08-07 Northern Telecom Limited Telephone handset with transmitter having a one piece gasket for sealing and holding of transmitter members

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees