JPS56156938A - Focus control device of laser beam - Google Patents

Focus control device of laser beam

Info

Publication number
JPS56156938A
JPS56156938A JP5977480A JP5977480A JPS56156938A JP S56156938 A JPS56156938 A JP S56156938A JP 5977480 A JP5977480 A JP 5977480A JP 5977480 A JP5977480 A JP 5977480A JP S56156938 A JPS56156938 A JP S56156938A
Authority
JP
Japan
Prior art keywords
lens
disk
laser beam
optimum
constitution
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
JP5977480A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical Co 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP5977480A priority Critical patent/JPS56156938A/en
Priority to DE19813117733 priority patent/DE3117733A1/en
Publication of JPS56156938A publication Critical patent/JPS56156938A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0937—Piezo-electric actuators
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids

Abstract

PURPOSE: To ensure the optimum in-focus state with a simple and inexpensive structure, by using an electrostrictive element as the support member of a lens which focuses the laser beam.
CONSTITUTION: The optical beam sent from a laser device 2 is focused by a lens 6 at a focal control part 3 and then given onto a disk 1 via a half-mirror 4 and enters an optical sensor 5. The lens 6 is held at its surroundings by an elastic holding member 7 such as rubber or the like and at the same time held by an electrostrictive element 8 made of a bimorph element at four areas. The application voltage 10 to said element 8 is controlled by a volume 11, and thus the lens is kept horizontal to the disk 1. Under such conditions, the lens 6 moves up and down to vary the spot state on the disk 1. In such way, the optimum in-focus state is ensured with a simple and inexpensive constitution.
COPYRIGHT: (C)1981,JPO&Japio
JP5977480A 1980-05-06 1980-05-06 Focus control device of laser beam Pending JPS56156938A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5977480A JPS56156938A (en) 1980-05-06 1980-05-06 Focus control device of laser beam
DE19813117733 DE3117733A1 (en) 1980-05-06 1981-05-05 Control device for the optical focusing of a laser light beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5977480A JPS56156938A (en) 1980-05-06 1980-05-06 Focus control device of laser beam

Publications (1)

Publication Number Publication Date
JPS56156938A true JPS56156938A (en) 1981-12-03

Family

ID=13122965

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5977480A Pending JPS56156938A (en) 1980-05-06 1980-05-06 Focus control device of laser beam

Country Status (2)

Country Link
JP (1) JPS56156938A (en)
DE (1) DE3117733A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116603A (en) * 1982-12-23 1984-07-05 Yokogawa Hokushin Electric Corp Actuator for moving light source

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685767A (en) * 1984-02-27 1987-08-11 Matsushita Electric Industrial Co., Ltd. Fine adjustment apparatus for optical system lens
KR100296389B1 (en) * 1998-08-14 2001-08-07 박태진 2-axis actuator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116603A (en) * 1982-12-23 1984-07-05 Yokogawa Hokushin Electric Corp Actuator for moving light source
JPH0223848B2 (en) * 1982-12-23 1990-05-25 Yokogawa Electric Corp

Also Published As

Publication number Publication date
DE3117733A1 (en) 1982-01-21

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