GB325067A - Improvements in or relating to electro-magnetic vibratory devices for use for example in the recording or reproduction of sound - Google Patents
Improvements in or relating to electro-magnetic vibratory devices for use for example in the recording or reproduction of soundInfo
- Publication number
- GB325067A GB325067A GB73429A GB73429A GB325067A GB 325067 A GB325067 A GB 325067A GB 73429 A GB73429 A GB 73429A GB 73429 A GB73429 A GB 73429A GB 325067 A GB325067 A GB 325067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pole
- armature
- magnet
- sound
- limb
- 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
- H04R11/00—Transducers of moving-armature or moving-core type
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
325,067. Gramophone Co., Ltd., Whitaker, A., and Payne, E. M. Jan. 8, 1929. Magnetic instruments; phonographic recorders and reproducers.-An electromagnetic vibratory device, more particularly for use in converting electrical oscillations into sound and vice versa, comprises a permanent magnet and an armature mounted for vibration between, and towards and away from, a pair of magnet poles, and transversely with respect to a third magnet pole thereby varying the overlapping area between the armature and third magnet pole, a magnetic circuit separate from the polarizing magnet being provided for the oscillatory magnetic flux. In the construction shown, one limb 3 of a U-shaped permanent magnet is attached to a back plate 1 and the other limb 4, which is tapered nearly to a point, projects downwards in front of the device. A laminated pole piece 5, having two pole tips 6 which project inwardly in the plane of and beneath the pole 4, is attached to the plate 1 in contact with the limb 3. A coil 7 is arranged around one or both of the forwardly projecting portions of the pole piece 5. The pole piece 5 and pole tips 6 constitute a circuit for the oscillatory magnetic flux which is separate from the permanent polarizing magnet. An armature 17 is pivoted about an axis 15 lying between the pole tips 6 and pole 4 so that during vibration of the armature, the overlapping area between the tip thereof and the pole 4 is varied, thereby furnishing a centring force for the armature. Either end of the armature may be connected by a rod 18 to a diaphragm 16 or the rod 18 may be attached to the centre of the armature and a suitable hole therefor provided in the right-hand pole tip 6. The Provisional Specification describes a device for the recording or reproduction of sound, employing a similar construction of magnetic circuit to that described above, the armature in this case being operated by a stylus. Specification 312,468 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB73429A GB325067A (en) | 1929-01-08 | 1929-01-08 | Improvements in or relating to electro-magnetic vibratory devices for use for example in the recording or reproduction of sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB73429A GB325067A (en) | 1929-01-08 | 1929-01-08 | Improvements in or relating to electro-magnetic vibratory devices for use for example in the recording or reproduction of sound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB325067A true GB325067A (en) | 1930-02-13 |
Family
ID=9709594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB73429A Expired GB325067A (en) | 1929-01-08 | 1929-01-08 | Improvements in or relating to electro-magnetic vibratory devices for use for example in the recording or reproduction of sound |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB325067A (en) |
-
1929
- 1929-01-08 GB GB73429A patent/GB325067A/en not_active Expired
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