JPS6464136A - Lens focusing actuator - Google Patents

Lens focusing actuator

Info

Publication number
JPS6464136A
JPS6464136A JP22260287A JP22260287A JPS6464136A JP S6464136 A JPS6464136 A JP S6464136A JP 22260287 A JP22260287 A JP 22260287A JP 22260287 A JP22260287 A JP 22260287A JP S6464136 A JPS6464136 A JP S6464136A
Authority
JP
Japan
Prior art keywords
powder
coupled
permanent magnet
movable part
auxiliary magnetic
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
Application number
JP22260287A
Other languages
Japanese (ja)
Inventor
Hiroshi Ito
Michio Yanagisawa
Tsugio Ide
Mitsuhiro Horikawa
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP22260287A priority Critical patent/JPS6464136A/en
Publication of JPS6464136A publication Critical patent/JPS6464136A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To eliminate the need of a power supply to a movable part, to easily enhance the accuracy of the mechanism, and to speed up an optical memory, by using an Nd-Fe-B series rare earth permanent magnet for the movable part of a lens focusing actuator, and constituting all the movable parts of ring-shaped components. CONSTITUTION:To a lens holder 102 to which an objective lens 101 of an optical head is coupled, an auxiliary magnetic pole 103 is coupled, and auxiliary magnetic poles 103, 104 to which a coupled permanent magnet 105 are supported by a plastic sleeve 106. At the outside of this sleeve 106, coils 107, 108 are arranged, and a magnetic circuit is constituted of a yoke 109. This permanent magnet 105 is a magnet of Nd-Fe-B series compound rare earth, and the auxiliary magnetic poles 103, 104 consist of a magnetic pole brought to a green compact by mixing Fe powder, Co powder and Mn powder. Also, all movable parts of a lens focusing actuator are constituted of ring-shaped components, a current in the reverse direction is allowed to flow to the coils 107, 108, it is contrived to make the movable part light in weight, and the high speed responsiveness of the actuator is improved.
JP22260287A 1987-09-04 1987-09-04 Lens focusing actuator Pending JPS6464136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22260287A JPS6464136A (en) 1987-09-04 1987-09-04 Lens focusing actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22260287A JPS6464136A (en) 1987-09-04 1987-09-04 Lens focusing actuator

Publications (1)

Publication Number Publication Date
JPS6464136A true JPS6464136A (en) 1989-03-10

Family

ID=16785038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22260287A Pending JPS6464136A (en) 1987-09-04 1987-09-04 Lens focusing actuator

Country Status (1)

Country Link
JP (1) JPS6464136A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054872A1 (en) * 1998-04-17 1999-10-28 Koninklijke Philips Electronics N.V. Optical scanning device comprising a lens system with a compact actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054872A1 (en) * 1998-04-17 1999-10-28 Koninklijke Philips Electronics N.V. Optical scanning device comprising a lens system with a compact actuator

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