JPS5627600A - Magnetic circuit of moving coil type transducer - Google Patents
Magnetic circuit of moving coil type transducerInfo
- Publication number
- JPS5627600A JPS5627600A JP10253879A JP10253879A JPS5627600A JP S5627600 A JPS5627600 A JP S5627600A JP 10253879 A JP10253879 A JP 10253879A JP 10253879 A JP10253879 A JP 10253879A JP S5627600 A JPS5627600 A JP S5627600A
- Authority
- JP
- Japan
- Prior art keywords
- slits
- magnetic
- moving coil
- center pole
- magnetic field
- 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.)
- Pending
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/021—Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
PURPOSE:To distribute a magnetic field evenly while suppressing the generation of an eddy current by equally dividing a center pole by radially forming slits at the magnetic pole part of the center pole and a front plate. CONSTITUTION:The columnar center pole has the tip part, fitted in a moving coil, cut by four narrow-width slits 10 penetrating center point 9 to obtain eight equal parts 14 of 45 deg.. The cutting depth of each slit is nearly equal to the maximum amplitude of the moving coil and the number of slits is changeable in accordance with the diameter of the center pole and the purpose of use, but normally about 2-6. Consequently, since the slits are cut in the passing direction of magnetic flux, the possibility that the magnetic resistance increases is a little and the deterioration of the magnetic density of a gap magnetic field is small. Additionally, the cutting effect of slits and the effect of conduction layer formation are involved mutually, so that the generation of an eddy current. Further, an even magnetic field is provided through equal-angle division of slits.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10253879A JPS5627600A (en) | 1979-08-10 | 1979-08-10 | Magnetic circuit of moving coil type transducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10253879A JPS5627600A (en) | 1979-08-10 | 1979-08-10 | Magnetic circuit of moving coil type transducer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5627600A true JPS5627600A (en) | 1981-03-17 |
Family
ID=14330041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10253879A Pending JPS5627600A (en) | 1979-08-10 | 1979-08-10 | Magnetic circuit of moving coil type transducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5627600A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339820A2 (en) * | 1988-04-26 | 1989-11-02 | Saad Gabr | Electromagnetic transducer |
WO1990005435A1 (en) * | 1988-11-07 | 1990-05-17 | Harman International Industries, Incorporated | Shallow loudspeaker with slotted magnet structure |
US5042072A (en) * | 1989-04-14 | 1991-08-20 | Harman International Industries, Inc. | Self-cooled loudspeaker |
US5081684A (en) * | 1988-11-07 | 1992-01-14 | Harman International Industries, Incorporated | Shallow loudspeaker with slotted magnet structure |
US5883967A (en) * | 1997-04-15 | 1999-03-16 | Harman International Industries, Incorporated | Slotted diaphragm loudspeaker |
EP1137320A2 (en) * | 2000-03-23 | 2001-09-26 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
EP2512154A1 (en) * | 2011-04-12 | 2012-10-17 | Harman International Industries, Incorporated | Loudspeaker magnet having a channel |
EP2512153A1 (en) * | 2011-04-12 | 2012-10-17 | Harman International Industries, Incorporated | Loudspeaker magnet assembly |
CN104320745A (en) * | 2014-10-24 | 2015-01-28 | 歌尔声学股份有限公司 | Speaker |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5187025A (en) * | 1975-01-28 | 1976-07-30 | Mitsubishi Electric Corp | SUPIIKANOJIKI KAIRO |
-
1979
- 1979-08-10 JP JP10253879A patent/JPS5627600A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5187025A (en) * | 1975-01-28 | 1976-07-30 | Mitsubishi Electric Corp | SUPIIKANOJIKI KAIRO |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339820A2 (en) * | 1988-04-26 | 1989-11-02 | Saad Gabr | Electromagnetic transducer |
EP0339820A3 (en) * | 1988-04-26 | 1991-03-20 | Saad Gabr | Electromagnetic transducer |
WO1990005435A1 (en) * | 1988-11-07 | 1990-05-17 | Harman International Industries, Incorporated | Shallow loudspeaker with slotted magnet structure |
US5081684A (en) * | 1988-11-07 | 1992-01-14 | Harman International Industries, Incorporated | Shallow loudspeaker with slotted magnet structure |
AU620185B2 (en) * | 1988-11-07 | 1992-02-13 | Harman International Industries Incorporated | Shallow loudspeaker with slotted magnet structure |
US5042072A (en) * | 1989-04-14 | 1991-08-20 | Harman International Industries, Inc. | Self-cooled loudspeaker |
US5883967A (en) * | 1997-04-15 | 1999-03-16 | Harman International Industries, Incorporated | Slotted diaphragm loudspeaker |
EP1137320A3 (en) * | 2000-03-23 | 2003-01-02 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
EP1137320A2 (en) * | 2000-03-23 | 2001-09-26 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
US6836551B2 (en) | 2000-03-23 | 2004-12-28 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
EP2512154A1 (en) * | 2011-04-12 | 2012-10-17 | Harman International Industries, Incorporated | Loudspeaker magnet having a channel |
EP2512153A1 (en) * | 2011-04-12 | 2012-10-17 | Harman International Industries, Incorporated | Loudspeaker magnet assembly |
US8548191B2 (en) | 2011-04-12 | 2013-10-01 | Harman International Industries, Incorporated | Loudspeaker magnet having a channel |
US8879774B2 (en) | 2011-04-12 | 2014-11-04 | Harman International Industries, Incorporated | Loudspeaker magnet assembly with two inner magnets comprising a central bore |
CN104320745A (en) * | 2014-10-24 | 2015-01-28 | 歌尔声学股份有限公司 | Speaker |
US9763011B2 (en) | 2014-10-24 | 2017-09-12 | Goertek, Inc. | Speaker |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1369404A (en) | Method and device for measuring a stress employing magneto striction | |
JPS5627600A (en) | Magnetic circuit of moving coil type transducer | |
GB1458296A (en) | ||
JPS51149008A (en) | Magnetic recording medium manufacturing method | |
GB1208738A (en) | Improvements in or relating to knitting machines having selection devices | |
SU698559A3 (en) | Solenoid-type electromagnetic device | |
JPS55120347A (en) | Sine wave magnetic pole type generator | |
JPS5284722A (en) | Thin film magnetic head and its production | |
SU581599A1 (en) | Band loudspeaker | |
US2408060A (en) | Electrical measuring instrument | |
US3806670A (en) | Current collector | |
JPS5634298A (en) | Magnetic circuit for speaker | |
JPS5241520A (en) | Electroacoustic converter | |
GB774195A (en) | Improvements in electrical generators | |
JPS5559470A (en) | Counter electrode in non-impact recording system | |
JPS55148718A (en) | High-frequency hardening method provided with short-circuit coil | |
JPS5240026A (en) | High-speed printing equipment | |
JPS53138380A (en) | Magnetic field detecting element | |
JPS5474409A (en) | Production of multi-track magnetic head | |
JPS5683A (en) | Magnetic bubble generator | |
JPS5681867A (en) | Magnetic brush developing device | |
JPS5325409A (en) | Magnetic head | |
JPS5244627A (en) | Magnet core type speaker | |
JPS5684024A (en) | Pulse generator | |
DEMIRKHANOV et al. | R-Om experimental setup for studying the interaction of high-frequency fields with a plasma(R-Om experimental setup for studying interaction of high frequency magnetic fields with plasma) |