GB286719A - Improvements relating to electro-magnetic sound recorders and reproducers - Google Patents
Improvements relating to electro-magnetic sound recorders and reproducersInfo
- Publication number
- GB286719A GB286719A GB6884/28A GB688428A GB286719A GB 286719 A GB286719 A GB 286719A GB 6884/28 A GB6884/28 A GB 6884/28A GB 688428 A GB688428 A GB 688428A GB 286719 A GB286719 A GB 286719A
- Authority
- GB
- United Kingdom
- Prior art keywords
- secured
- casing
- armature
- castings
- filled
- 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/16—Mounting or connecting stylus to transducer with or without damping means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
Abstract
286,719. British Thomson-Houston Co., Ltd., (Assignees of Robinson, L. T.). March 10, 1927, [Convention date]. Magnetic instrurnents.-An electromagnetic device for recording sound or for reproducing sound from a record comprises a casing formed from castings 3, end-plates 4, and top and bottom plates 5, 6, the casing being filled with a damping liquid 7, such as oil, in which a laminated armature 12 is adapted to vibrate between polepieces 9 set into the castings 3 and surrounding the coils 10. The pole-pieces are secured to the ends of a horseshoe magnet 8 which spans the casing. A rod 16 secured to the lower end of the armature and carrying the stylus 17, extends through a flexible diaphragm 18, Fig. 2, or 20, Fig 3, secured at its outer end to the plate, 6. The armature, which is supported by a ligament 13 secured to tensioning screws 14, carries at its upper end a vane 23 which is enclosed to a greater or lesser extent by an adjustable hollow member 24. the screw stud 25 on which extends through the top plate 5. Screw plugs 21 are provided in the top plate to allow the casing to be filled and emptied.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US174355A US1760527A (en) | 1927-03-10 | 1927-03-10 | Electrical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB286719A true GB286719A (en) | 1928-11-22 |
Family
ID=22635864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6884/28A Expired GB286719A (en) | 1927-03-10 | 1928-03-05 | Improvements relating to electro-magnetic sound recorders and reproducers |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1760527A (en) |
| DE (1) | DE546861C (en) |
| FR (1) | FR651366A (en) |
| GB (1) | GB286719A (en) |
| NL (1) | NL29665C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2514379A (en) * | 1947-08-25 | 1950-07-11 | Jr Charles R Douglass | Electrodynamic recording head |
-
0
- NL NL29665D patent/NL29665C/xx active
-
1927
- 1927-03-10 US US174355A patent/US1760527A/en not_active Expired - Lifetime
-
1928
- 1928-03-05 GB GB6884/28A patent/GB286719A/en not_active Expired
- 1928-03-09 FR FR651366D patent/FR651366A/en not_active Expired
- 1928-03-09 DE DEA53496D patent/DE546861C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE546861C (en) | 1932-03-21 |
| US1760527A (en) | 1930-05-27 |
| NL29665C (en) | |
| FR651366A (en) | 1929-02-18 |
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