GB552328A - Improvements in or relating to loud speakers and the like - Google Patents

Improvements in or relating to loud speakers and the like

Info

Publication number
GB552328A
GB552328A GB15642/41A GB1564241A GB552328A GB 552328 A GB552328 A GB 552328A GB 15642/41 A GB15642/41 A GB 15642/41A GB 1564241 A GB1564241 A GB 1564241A GB 552328 A GB552328 A GB 552328A
Authority
GB
United Kingdom
Prior art keywords
piece
pole
bush
centred
fitting
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
Application number
GB15642/41A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RESLO SOUND EQUIPMENT Ltd
Original Assignee
RESLO SOUND EQUIPMENT Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RESLO SOUND EQUIPMENT Ltd filed Critical RESLO SOUND EQUIPMENT Ltd
Priority to GB15642/41A priority Critical patent/GB552328A/en
Publication of GB552328A publication Critical patent/GB552328A/en
Priority to FR940616D priority patent/FR940616A/en
Priority to US755699A priority patent/US2490227A/en
Expired legal-status Critical Current

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

Abstract

552,328. Loud speakers &c. RESLO (SOUND EQUIPMENT), Ltd., MURKHAM, L. W. Dec. 4, 1941, No. 15642. [Class 40 (iv)] In a loud-speaker or microphone of the moving coil type having an annular gap between the inner pole-piece 7 and an outer pole-piece 5, the diaphragm unit and the outer pole-piece are centred by fitting them in a common circular recess 4 which may be formed in the rear surface of the front 2 of the housing. The inner pole-piece 7 is centred by a non- magnetic bush 8 mounted on the back of the pole-piece 5, the pole-piece 7 fitting in the bush and having a shoulder 9 which limits its rearward movement. A single screw 10 secures the pole-pieces 5, 7, magnet 12 and plate 11 rigidly together. Screws 14 press the pole-piece 5 into the recess 4, thereby clamping the diaphragm unit in position. To reduce air damping, holes 15 are made in the outer pole-piece 5 and bush 8, and additional holes 16 (in the bush 8) and 17 (in the plate 11) permit, air to escape from the annular gap. The bush 8 is attached to the rear side of the pole-piece 5 by heat springing. In a modification, Fig. 3 (not shown), the outer casing has an opening communicating with the atmosphere provided with a shield so arranged that rain cannot enter the casing in any position.
GB15642/41A 1941-12-04 1941-12-04 Improvements in or relating to loud speakers and the like Expired GB552328A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB15642/41A GB552328A (en) 1941-12-04 1941-12-04 Improvements in or relating to loud speakers and the like
FR940616D FR940616A (en) 1941-12-04 1946-04-02 Improvements to speakers and similar devices
US755699A US2490227A (en) 1941-12-04 1947-06-19 Electrodynamic loud-speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15642/41A GB552328A (en) 1941-12-04 1941-12-04 Improvements in or relating to loud speakers and the like

Publications (1)

Publication Number Publication Date
GB552328A true GB552328A (en) 1943-04-01

Family

ID=10062818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15642/41A Expired GB552328A (en) 1941-12-04 1941-12-04 Improvements in or relating to loud speakers and the like

Country Status (3)

Country Link
US (1) US2490227A (en)
FR (1) FR940616A (en)
GB (1) GB552328A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501031A (en) * 1945-11-30 1950-03-21 Rca Corp Magnetic field structure for dynamic loud-speakers and the like
US2501032A (en) * 1945-11-30 1950-03-21 Rca Corp Permanent magnet assembly for electrodynamic loud-speakers

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755343A (en) * 1951-10-05 1956-07-17 Univ Loudspeakers Inc Blast-proof and submergence-proof sound reproducing device
DE968466C (en) * 1952-02-23 1958-02-20 Siemens Ag Pressure chamber loudspeaker, especially with a dome membrane
US2942071A (en) * 1954-10-01 1960-06-21 Rca Corp Horn-type transducer
US3258543A (en) * 1962-10-01 1966-06-28 Electro Voice Dynamic microphone
US4031337A (en) * 1974-12-16 1977-06-21 Matsushita Electric Industrial Co., Ltd. Loudspeaker
JP2905350B2 (en) * 1992-11-18 1999-06-14 スター精密 株式会社 Electroacoustic transducer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766473A (en) * 1928-05-05 1930-06-24 Bell Telephone Labor Inc Electrodynamic device
US1869178A (en) * 1930-08-15 1932-07-26 Bell Telephone Labor Inc Sound translating device
US1847702A (en) * 1931-05-02 1932-03-01 Bell Telephone Labor Inc Sound translating device
US2295483A (en) * 1934-06-04 1942-09-08 Jensen Radio Mfg Company Loudspeaker
BE412830A (en) * 1934-12-29
GB490750A (en) * 1937-02-19 1938-08-19 Leonard Young Electro-dynamic devices for interconverting electrical oscillations and sound waves
US2403535A (en) * 1944-03-18 1946-07-09 Texas Co Well sounding microphone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501031A (en) * 1945-11-30 1950-03-21 Rca Corp Magnetic field structure for dynamic loud-speakers and the like
US2501032A (en) * 1945-11-30 1950-03-21 Rca Corp Permanent magnet assembly for electrodynamic loud-speakers

Also Published As

Publication number Publication date
FR940616A (en) 1948-12-17
US2490227A (en) 1949-12-06

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