GB672465A - Permanent magnet structure for a loudspeaker - Google Patents
Permanent magnet structure for a loudspeakerInfo
- Publication number
- GB672465A GB672465A GB13777/50A GB1377750A GB672465A GB 672465 A GB672465 A GB 672465A GB 13777/50 A GB13777/50 A GB 13777/50A GB 1377750 A GB1377750 A GB 1377750A GB 672465 A GB672465 A GB 672465A
- Authority
- GB
- United Kingdom
- Prior art keywords
- permanent magnet
- loudspeaker
- magnet structure
- pole tip
- magnet
- 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)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
672,465. Permanent magnets. ROLA CO., Inc. June 1, 1950, No. 13777/50. Class 35. A permanent magnet structure for a loud-speaker has pole tip 31 and a permanent magnet 30 having isotropic and anisotropic characteristics respectively and an annular pole 20 supported by the structure and surrounding the pole tip 31 and part of the magnet 30 so as to provide an air gap for the voice coil 51.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63015A US2517727A (en) | 1948-12-02 | 1948-12-02 | Permanent magnet structure for electrodynamic loud-speakers |
GB13777/50A GB672465A (en) | 1950-06-01 | 1950-06-01 | Permanent magnet structure for a loudspeaker |
FR1019894D FR1019894A (en) | 1950-06-01 | 1950-06-09 | Permanent magnet for speaker |
US23856D USRE23856E (en) | 1950-06-01 | 1951-07-27 | Permanent magnet structure for |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13777/50A GB672465A (en) | 1950-06-01 | 1950-06-01 | Permanent magnet structure for a loudspeaker |
Publications (1)
Publication Number | Publication Date |
---|---|
GB672465A true GB672465A (en) | 1952-05-21 |
Family
ID=10029174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13777/50A Expired GB672465A (en) | 1948-12-02 | 1950-06-01 | Permanent magnet structure for a loudspeaker |
Country Status (3)
Country | Link |
---|---|
US (2) | US2517727A (en) |
FR (1) | FR1019894A (en) |
GB (1) | GB672465A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2974204A (en) * | 1954-07-06 | 1961-03-07 | Kane Corp Du | Transducer |
US2964597A (en) * | 1954-12-10 | 1960-12-13 | Rca Corp | Loudspeaker magnetic field structure |
USRE26030E (en) * | 1956-02-28 | 1966-05-24 | Dynamic transducer | |
US4327257A (en) * | 1979-09-10 | 1982-04-27 | Schwartz Leslie H | Alignment device for electro-acoustical transducers |
US6963652B1 (en) | 2003-04-18 | 2005-11-08 | James M Colombo | Low frequency generator |
FR2865608B1 (en) * | 2004-01-23 | 2007-02-09 | Robert Rigondeau | ELECTOACOUSTIC TRANSDUCER AND SPEAKER COMPRISING IT |
US20070242849A1 (en) * | 2006-04-13 | 2007-10-18 | Galax Multimedia Co., Ltd. | Loudspeaker with high power efficiency and low resonance frequency |
US7675202B1 (en) | 2007-07-18 | 2010-03-09 | Benjamin Huang | Isotropic ring magnet linear voice coil motor |
US9699565B2 (en) * | 2014-12-07 | 2017-07-04 | Cardas Audio Ltd. | Loudspeaker using contour field hard magnet poles and yoke construction |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB297183A (en) * | 1927-07-21 | 1928-09-20 | British Thomson Houston Co Ltd | Improvements relating to devices for the interconversion of electrical and mechanical vibrations, such as loud-speakers |
US1955248A (en) * | 1928-04-18 | 1934-04-17 | Messick Charies | Magnetic movement |
US1918164A (en) * | 1929-09-10 | 1933-07-11 | William L Woolf | Acoustic device |
BE414989A (en) * | 1935-04-13 | |||
US2458158A (en) * | 1942-11-25 | 1949-01-04 | Permoflux Corp | Magnetically shielded electrodynamic sound reproducer |
-
1948
- 1948-12-02 US US63015A patent/US2517727A/en not_active Expired - Lifetime
-
1950
- 1950-06-01 GB GB13777/50A patent/GB672465A/en not_active Expired
- 1950-06-09 FR FR1019894D patent/FR1019894A/en not_active Expired
-
1951
- 1951-07-27 US US23856D patent/USRE23856E/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1019894A (en) | 1953-01-27 |
USRE23856E (en) | 1954-07-27 |
US2517727A (en) | 1950-08-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB672465A (en) | Permanent magnet structure for a loudspeaker | |
ES416111A1 (en) | Movable magnet loudspeaker | |
GB677225A (en) | Improvements in or relating to electro-acoustic transducers | |
GB1460744A (en) | Loud speakers of the moving coil type | |
GB653923A (en) | Improvements in or relating to electro-acoustic transducers | |
GB672467A (en) | Improvements in and relating to sound reproducing devices | |
GB311486A (en) | Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers | |
GB341531A (en) | Loud speakers | |
GB1229040A (en) | ||
GB643518A (en) | Improvements in or relating to transducers | |
CH310549A (en) | Electrodynamic loudspeaker, the magnet system of which contains a core and an annular pole piece surrounding a core end at an air gap. | |
GB643465A (en) | Improvements relating to loudspeakers | |
GB670876A (en) | Improvements in loud speakers | |
GB646180A (en) | Improvements in electrodynamic recording devices | |
GB703809A (en) | Improvements relating to moving coil loudspeakers and other forms of transducer | |
GB1002128A (en) | Improvements in and relating to electric-acoustic transducers | |
JPS5244627A (en) | Magnet core type speaker | |
GB696126A (en) | Improvements in magnets with annular gaps | |
GB603649A (en) | Improvements in sound-reproducing devices | |
GB304709A (en) | Improvements in or relating to telephonic sound reproducing instruments | |
GB624566A (en) | Improvements in or relating to electromagnetic vibratory devices | |
GB674875A (en) | Improvements in permanent magnet assemblies for moving coil loudspeakers, microphones and other instruments | |
GB664812A (en) | Improvements in or relating to loudspeakers | |
GB719188A (en) | Improvements in or relating to electro-dynamic loud-speakers | |
GB705330A (en) | Improvements relating to electromagnetic telephone instruments |