GB295342A - Improvements in or relating to telephonic apparatus - Google Patents
Improvements in or relating to telephonic apparatusInfo
- Publication number
- GB295342A GB295342A GB1198827A GB1198827A GB295342A GB 295342 A GB295342 A GB 295342A GB 1198827 A GB1198827 A GB 1198827A GB 1198827 A GB1198827 A GB 1198827A GB 295342 A GB295342 A GB 295342A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conductor
- supported
- telephonic
- magnetic
- diaphragms
- 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
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Telephone Set Structure (AREA)
Abstract
295,342. Turner, P. K., and Rickets, W. J. May 4, 1927. Magnetic instruments; diaphragms.- In a telephone transmitter or receiver a short-circuited conductor located in a unidirectional field is magnetically linked with the telephonic coils. As shown in Fig. 1, two diaphragms g, g<1> of a receiver or transmitter are connected by pairs of struts h to a shortcircuited conductor d which is pivoted so that its sides oscillate in unidirectional fields produced in the gaps y, y<1> formed between the polar extensions a<1>, a<2> of a permanent or electro-magnet a and a central magnetic member b, supported on extensions a<3>, a<4>. The telephonic coils c, c<1> are supported on the central member b. The closed circuit conductor may be rectangular, circular or triangular and may be made wholly of conducting material such as copper, aluminium or iron or partly of iron and partly of a better conducting material. Instead of completing the magnetic circuit of the member b through the magnet a separate soft iron flux paths may be provided. The magnetic system is supported by vertical supports k, k<1> on a base m, the diaphragms g, g<1> being supported between a ring i of soft material and a strip j of flexible material. In the modification shown in Fig. 4, the conductor comprises two loops having a common central side d<1>. The outer sides are located in gaps y, y<1> formed between the poles a<1>, a<2> of an electromagnet a and the links of an auxiliary magnetic circuit r associated with the telephonic coil c. The electromagnet is permanently excited by coil s, s<1>, and the conductor is supported for reciprocating motion by ligaments k on pins t<1> fixed to the pole pieces. Alternatively the ligaments may extend through holes on the pole pieces to external tensioning means. The conductor is mounted on a diaphragm g flexible supported at u' and provided with a supplementary cone g*. In a further modification one side only of the closed circuit conductor is located in an air gap, the other side forming the axis of oscillation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1198827A GB295342A (en) | 1927-05-04 | 1927-05-04 | Improvements in or relating to telephonic apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1198827A GB295342A (en) | 1927-05-04 | 1927-05-04 | Improvements in or relating to telephonic apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB295342A true GB295342A (en) | 1928-08-07 |
Family
ID=9996361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1198827A Expired GB295342A (en) | 1927-05-04 | 1927-05-04 | Improvements in or relating to telephonic apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB295342A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2149272A (en) * | 1983-10-26 | 1985-06-05 | Adam Kovacs | Electromechanical transducer |
-
1927
- 1927-05-04 GB GB1198827A patent/GB295342A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2149272A (en) * | 1983-10-26 | 1985-06-05 | Adam Kovacs | Electromechanical transducer |
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