JPS5446310A - Voice coil motor - Google Patents

Voice coil motor

Info

Publication number
JPS5446310A
JPS5446310A JP11257777A JP11257777A JPS5446310A JP S5446310 A JPS5446310 A JP S5446310A JP 11257777 A JP11257777 A JP 11257777A JP 11257777 A JP11257777 A JP 11257777A JP S5446310 A JPS5446310 A JP S5446310A
Authority
JP
Japan
Prior art keywords
magnetic pole
ferromagnetic plate
flux
air gap
permanent 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.)
Granted
Application number
JP11257777A
Other languages
Japanese (ja)
Other versions
JPS5710666B2 (en
Inventor
Keiichi Tane
Yoshihiro Sato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11257777A priority Critical patent/JPS5446310A/en
Publication of JPS5446310A publication Critical patent/JPS5446310A/en
Publication of JPS5710666B2 publication Critical patent/JPS5710666B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Moving Of Heads (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

PURPOSE: To improve flux density in the gap where movable coil exists, by providing a plurality of air gap extending in circumferential direction of magnetic pole in ferromagnetic plate between permanent magnet and laminated magnetic pole.
CONSTITUTION: A plurality of air gaps 19 extending circumferentially in parallel are provided in ferromagnetic plate 18. With such ferromagnetic plate, magnetic flux at the center of permanent magnet never leaks from the edge of ferromagnetic plate but flows from magnetic pole 15 to air gap 4. Flux at the portion outside of magnetic pole 15 of permanent magnet 16 flows through outside portion of air gap 19 of ferromagnetic plate 18 to magnetic pole 15. Since flux of pemanent magnet is collected and leakage is reduced, flux density in air gap 4 is considerably increased
COPYRIGHT: (C)1979,JPO&Japio
JP11257777A 1977-09-21 1977-09-21 Voice coil motor Granted JPS5446310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11257777A JPS5446310A (en) 1977-09-21 1977-09-21 Voice coil motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11257777A JPS5446310A (en) 1977-09-21 1977-09-21 Voice coil motor

Publications (2)

Publication Number Publication Date
JPS5446310A true JPS5446310A (en) 1979-04-12
JPS5710666B2 JPS5710666B2 (en) 1982-02-27

Family

ID=14590193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11257777A Granted JPS5446310A (en) 1977-09-21 1977-09-21 Voice coil motor

Country Status (1)

Country Link
JP (1) JPS5446310A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03239150A (en) * 1990-02-13 1991-10-24 Hitachi Metals Ltd Voice coil type linear motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03239150A (en) * 1990-02-13 1991-10-24 Hitachi Metals Ltd Voice coil type linear motor

Also Published As

Publication number Publication date
JPS5710666B2 (en) 1982-02-27

Similar Documents

Publication Publication Date Title
JPS57146164A (en) Speed detecting device for disk type motor
JPS5446310A (en) Voice coil motor
JPS579197A (en) Speaker
JPS56129780A (en) Oscillatory type compressor
JPS5241520A (en) Electroacoustic converter
JPS5329527A (en) Rolled core with gap
JPS52119749A (en) Magnetic coupling
JPS567593A (en) Magnetic circuit for flat diaphragm speaker
JPS5577359A (en) Rotor for permanent magnet type synchronous machine
JPS5482228A (en) Converter
JPS5263709A (en) Film magnetic head of magnetic resistance effective type
JPS569676A (en) Vibratory compressor
JPS5411411A (en) Magnetic circuit
JPS52130307A (en) Bifacial magnetic field direction arrangement for magnetic disks
JPS5432715A (en) Manufacturing method of rotor for permanent magnet sync. machine
JPS5358604A (en) Super-thin type coreless dc motor
JPS5236704A (en) Stator of dc machine
JPS5267703A (en) Salient-pole field of rotary machine
JPS5240026A (en) High-speed printing equipment
JPS5799265A (en) Magnetic pole structure in electromagnetic fuel injection valve
JPS5346615A (en) Dc linear motor
JPS53100415A (en) Rotor having a permanent magnet
JPS5244627A (en) Magnet core type speaker
JPS5328366A (en) Magnetron u nit
JPS5461612A (en) Multipolar-multiplex inductor type synchroresolver