GB812348A - Improvements in and relating to electro magnetic transducers - Google Patents
Improvements in and relating to electro magnetic transducersInfo
- 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
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.
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)
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 |
-
1954
- 1954-06-03 GB GB1643954A patent/GB812348A/en not_active Expired
Cited By (1)
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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