GB708773A - Improvements in or relating to sound recording apparatus - Google Patents
Improvements in or relating to sound recording apparatusInfo
- Publication number
- GB708773A GB708773A GB768552A GB768552A GB708773A GB 708773 A GB708773 A GB 708773A GB 768552 A GB768552 A GB 768552A GB 768552 A GB768552 A GB 768552A GB 708773 A GB708773 A GB 708773A
- Authority
- GB
- United Kingdom
- Prior art keywords
- former
- core
- carries
- pole pieces
- relating
- 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
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Magnetic Heads (AREA)
Abstract
708,773. Phonographic recorders. DECCA RECORD CO., Ltd. Feb. 4, 1953 [March 25, 1952], No. 7685/52. Class 40 (4) The moving coil 18 of a sound recorder for lateral-cut records is mounted for oscillatory movement between a ferro-magnetic core 15 and magnet pole pieces 10, 11 by torsionallyresilient members 20, 21, the coil being carried by a light alloy former 17 containing a viscous damping fluid which fills the gap between the former and the core. A narrowed portion 19 of the former carries a cutting stylus (not shown). The pole pieces and their spacers 12, 13 are secured to a brass plate 14 which carries a cylindrical brass support 16 for the ferromagnetic core.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB768552A GB708773A (en) | 1952-03-25 | 1952-03-25 | Improvements in or relating to sound recording apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB768552A GB708773A (en) | 1952-03-25 | 1952-03-25 | Improvements in or relating to sound recording apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB708773A true GB708773A (en) | 1954-05-12 |
Family
ID=9837829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB768552A Expired GB708773A (en) | 1952-03-25 | 1952-03-25 | Improvements in or relating to sound recording apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB708773A (en) |
-
1952
- 1952-03-25 GB GB768552A patent/GB708773A/en not_active Expired
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