GB812348A - Improvements in and relating to electro magnetic transducers - Google Patents

Improvements in and relating to electro magnetic transducers

Info

Publication number
GB812348A
GB812348A GB1643954A GB1643954A GB812348A GB 812348 A GB812348 A GB 812348A GB 1643954 A GB1643954 A GB 1643954A GB 1643954 A GB1643954 A GB 1643954A GB 812348 A GB812348 A GB 812348A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
atmosphere
path
casing
centre
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
GB1643954A
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.)
Individual
Original Assignee
Individual
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB812348A publication Critical patent/GB812348A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/08—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

812,348. Microphones. MURKHAM, L. W. Aug. 22, 1955 [June 3, 1954], No. 16439/54. Class 40 (4). In a moving coil transducer the air gap is connected to atmosphere on the side remote from the diaphragm through an acoustic path which is restricted to eliminate the effect on the diaphragm of resonance in the path. A substantially annular path between the centre pole 10 of a microphone, Fig. 1, and an internally ribbed non-magnetic sleeve 16 connects the gap to atmosphere through an annular path 16a and holes 11a. The diaphragm 14 is clamped between spacing washers 18, 19, by a clamping piece 17 and a block 20 the contours of which correspond with that of the diaphragm by a part 28 of the casing. Vents 22 connect the diaphragm to atmosphere. The instrument employs a permanent magnet 12 and the interengaging shoulders on parts 13, 16 and 17 serve to locate the polepiece 13 and centre the diaphragm. A boring in the central pole 10 communicates through a narrow bore 10a with the dished portion of the diaphragm to modify the damping characteristic. Openings in casing 23 are covered with protective gauzes 23a and 24-26.
GB1643954A 1954-06-03 Improvements in and relating to electro magnetic transducers Expired GB812348A (en)

Publications (1)

Publication Number Publication Date
GB812348A true GB812348A (en) 1959-04-22

Family

ID=1732308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1643954A Expired GB812348A (en) 1954-06-03 Improvements in and relating to electro magnetic transducers

Country Status (1)

Country Link
GB (1) GB812348A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790724A (en) * 1971-04-14 1974-02-05 Philips Corp Electromagnetic microphone including at least one acoustic resistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790724A (en) * 1971-04-14 1974-02-05 Philips Corp Electromagnetic microphone including at least one acoustic resistance

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