GB912142A - Improvements in or relating to electro-mechanical transducers - Google Patents
Improvements in or relating to electro-mechanical transducersInfo
- Publication number
- GB912142A GB912142A GB263060A GB263060A GB912142A GB 912142 A GB912142 A GB 912142A GB 263060 A GB263060 A GB 263060A GB 263060 A GB263060 A GB 263060A GB 912142 A GB912142 A GB 912142A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conductors
- copper
- jan
- annular space
- electro
- 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
- H04R9/06—Loudspeakers
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
912,142. Telephone instruments. PHILIPS ELECTRICAL INDUSTRIES Ltd. Jan. 25, 1960 [Jan. 28, 1959], No. 2630/60. Class 40 (4). In an electro-mechanical transducer particularly for use as a loud-speaker, a hollow cylindrical permanent magnet 4 attached by plate 3 and rod 2 to a diaphragm 1 is arranged so that it can move freely in an axial direction in the small annular space between two coaxial non-magnetic stationary conductors 5, 6, e.g. of copper, having axially extending slits 7, 8 (Fig. 2). The current supply terminals are at the walls of each slit and the current in the two conductors are in antiphase so that the fields in the annular space are in the same direction. Substantially all the lines of force from magnet 4, which is made, for example, of PtCo, length 10 mm. and wall thickness 2 mm., pass through the copper conductors if these are about 1 mm. thick. The total absence of iron in the magnetic circuit reduces asymmetries in the circuit which might result in lateral forces and hence unfavourable deformation of the response curve. Stripshaped conductors may replace the copper sleeves or wire wound coils may be used. Specification 469,093 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL235555 | 1959-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB912142A true GB912142A (en) | 1962-12-05 |
Family
ID=19751540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB263060A Expired GB912142A (en) | 1959-01-28 | 1960-01-25 | Improvements in or relating to electro-mechanical transducers |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT218089B (en) |
| BE (1) | BE586954A (en) |
| CH (1) | CH389689A (en) |
| DE (1) | DE1157656B (en) |
| FR (1) | FR1253988A (en) |
| GB (1) | GB912142A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4901357A (en) * | 1987-01-20 | 1990-02-13 | Albright Eugene A | Electromagnetic transducer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE411755A (en) * | 1934-10-19 | |||
| US2492255A (en) * | 1944-12-26 | 1949-12-27 | John O Angehrn | Sealed-coil type vibratory magnet loudspeaker |
| NL104049C (en) * | 1954-10-28 |
-
1960
- 1960-01-23 DE DEN17795A patent/DE1157656B/en active Pending
- 1960-01-25 CH CH77460A patent/CH389689A/en unknown
- 1960-01-25 GB GB263060A patent/GB912142A/en not_active Expired
- 1960-01-25 AT AT50760A patent/AT218089B/en active
- 1960-01-26 FR FR816733A patent/FR1253988A/en not_active Expired
- 1960-01-26 BE BE586954A patent/BE586954A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1157656B (en) | 1963-11-21 |
| AT218089B (en) | 1961-11-10 |
| CH389689A (en) | 1965-03-31 |
| BE586954A (en) | 1960-07-26 |
| FR1253988A (en) | 1961-02-17 |
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