GB401476A - Improvements in or relating to permanent magnets - Google Patents
Improvements in or relating to permanent magnetsInfo
- Publication number
- GB401476A GB401476A GB2661332A GB2661332A GB401476A GB 401476 A GB401476 A GB 401476A GB 2661332 A GB2661332 A GB 2661332A GB 2661332 A GB2661332 A GB 2661332A GB 401476 A GB401476 A GB 401476A
- Authority
- GB
- United Kingdom
- Prior art keywords
- steel
- whilst
- coercive force
- per cent
- sound reproducing
- 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
- H04R9/025—Magnetic circuit
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Surgical Instruments (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
401,476. Sound reproducing and transmitting devices. JESSOP & SONS, Ltd., W. and GOULD, J. E., Brightside Works, Sheffield. Sept. 26, 1932, No. 26613. [Class 40 (iv).] A permanent magnet having an annular air-gap, and more particularly for a moving coil sound reproducing instrument, has at least one of the members forming the polepieces of steel having a coercive force of not less than one hundred c.g.s. units and another part of steel of coercive force between thirty and eighty units. As shown, the former member forms the centre pole B, which may contain 6 to 35 per cent cobalt whilst the part A is of lower coercive force steel, such as 6 per cent tungsten or chromium steel whilst the perforated pole member C is of similar material or may be of soft iron or mild steel. In Fig. 3 the member A has four limbs but alternatively may have two whilst the Fig. 6 arrangement may be modified by making parts A and C integral. The components A, B and C may be screwed, riveted or welded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2661332A GB401476A (en) | 1932-09-26 | 1932-09-26 | Improvements in or relating to permanent magnets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2661332A GB401476A (en) | 1932-09-26 | 1932-09-26 | Improvements in or relating to permanent magnets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB401476A true GB401476A (en) | 1933-11-16 |
Family
ID=10246369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2661332A Expired GB401476A (en) | 1932-09-26 | 1932-09-26 | Improvements in or relating to permanent magnets |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB401476A (en) |
-
1932
- 1932-09-26 GB GB2661332A patent/GB401476A/en not_active Expired
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