JPS6443820A - Lens actuator - Google Patents

Lens actuator

Info

Publication number
JPS6443820A
JPS6443820A JP20068487A JP20068487A JPS6443820A JP S6443820 A JPS6443820 A JP S6443820A JP 20068487 A JP20068487 A JP 20068487A JP 20068487 A JP20068487 A JP 20068487A JP S6443820 A JPS6443820 A JP S6443820A
Authority
JP
Japan
Prior art keywords
magnetic
cover
magnetic field
substance
control
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
JP20068487A
Other languages
Japanese (ja)
Inventor
Tadashi Nomura
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP20068487A priority Critical patent/JPS6443820A/en
Publication of JPS6443820A publication Critical patent/JPS6443820A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To form a bias magnetic field with a small quantity of the energy consumption and penetration of heat and to attain a focus control and a tracking control without receiving the bad influence of a magnetic field by providing the cover of a ferro-magnetic substance on the surface along a recording medium. CONSTITUTION:On the surface along a recording medium 2 of an lens actuator, a cover 6 of the ferromagnetic substance is arranged. For this reason, since many magnetic fluxes to generate an electromagnetic 3 use a ferromagnetic substance cover 6 as a magnetic path, the magnetic resistance of the magnetic path is largely reduced, and a magnetic flux density also rises. Consequently, a sufficient bias magnetic field necessary to recording can be generated by a small quantity of the energy consumption and generation of heat. Since a driving force generating part to control the position of a converging lens is magnetically shielded by the ferro-magnetic substance cover 6, the satisfactory focus control and tracking control can be executed without receiving the bad influence of a bias magnetic field due to the electromagnet 3.
JP20068487A 1987-08-11 1987-08-11 Lens actuator Pending JPS6443820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20068487A JPS6443820A (en) 1987-08-11 1987-08-11 Lens actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20068487A JPS6443820A (en) 1987-08-11 1987-08-11 Lens actuator

Publications (1)

Publication Number Publication Date
JPS6443820A true JPS6443820A (en) 1989-02-16

Family

ID=16428528

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20068487A Pending JPS6443820A (en) 1987-08-11 1987-08-11 Lens actuator

Country Status (1)

Country Link
JP (1) JPS6443820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01118249A (en) * 1987-10-30 1989-05-10 Seiko Epson Corp Magneto-optical recording and reproducing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5794906A (en) * 1980-12-05 1982-06-12 Ricoh Co Ltd Optical magnetic recorder
JPS62119762A (en) * 1985-11-20 1987-06-01 Hitachi Ltd Photomagnetic disk device
JPS6356835A (en) * 1986-08-27 1988-03-11 Canon Inc Magneto-optical information recorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5794906A (en) * 1980-12-05 1982-06-12 Ricoh Co Ltd Optical magnetic recorder
JPS62119762A (en) * 1985-11-20 1987-06-01 Hitachi Ltd Photomagnetic disk device
JPS6356835A (en) * 1986-08-27 1988-03-11 Canon Inc Magneto-optical information recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01118249A (en) * 1987-10-30 1989-05-10 Seiko Epson Corp Magneto-optical recording and reproducing device

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