JPS55142423A - Detector of focus position for optical stylus - Google Patents

Detector of focus position for optical stylus

Info

Publication number
JPS55142423A
JPS55142423A JP5185279A JP5185279A JPS55142423A JP S55142423 A JPS55142423 A JP S55142423A JP 5185279 A JP5185279 A JP 5185279A JP 5185279 A JP5185279 A JP 5185279A JP S55142423 A JPS55142423 A JP S55142423A
Authority
JP
Japan
Prior art keywords
semiconductor laser
detector
focus position
photo detectors
optical stylus
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
JP5185279A
Other languages
Japanese (ja)
Inventor
Seio Watanabe
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5185279A priority Critical patent/JPS55142423A/en
Publication of JPS55142423A publication Critical patent/JPS55142423A/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
    • G11B7/0908—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 for focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To establish the unit low in the cost and high in the accuracy without time aging, by constituting the knife edge with the semiconductor laser itself through the use of upside-up type semiconductor laser. CONSTITUTION:The semiconductor laser is TJS type semiconductor laser, and the first and second photo detectors 9a, 9b are provided so that the extended surface of the end surface 22 near the light emitting point 21 is clipped at the back of the semiconductor laser 1. the output of the two photo detectors 9a, 9b is input to the differential amplifier 23 and the servo loop driving the electromagnetic drive section 24 with the differential output is constituted.
JP5185279A 1979-04-25 1979-04-25 Detector of focus position for optical stylus Pending JPS55142423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5185279A JPS55142423A (en) 1979-04-25 1979-04-25 Detector of focus position for optical stylus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5185279A JPS55142423A (en) 1979-04-25 1979-04-25 Detector of focus position for optical stylus

Publications (1)

Publication Number Publication Date
JPS55142423A true JPS55142423A (en) 1980-11-07

Family

ID=12898383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5185279A Pending JPS55142423A (en) 1979-04-25 1979-04-25 Detector of focus position for optical stylus

Country Status (1)

Country Link
JP (1) JPS55142423A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068390A2 (en) * 1981-06-22 1983-01-05 Kabushiki Kaisha Toshiba An optical head
EP0070552A2 (en) * 1981-07-20 1983-01-26 Kabushiki Kaisha Toshiba Optical head
EP0423295B1 (en) * 1989-04-25 1996-01-24 Thomson-Csf Optical reading device for an optical recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068390A2 (en) * 1981-06-22 1983-01-05 Kabushiki Kaisha Toshiba An optical head
EP0070552A2 (en) * 1981-07-20 1983-01-26 Kabushiki Kaisha Toshiba Optical head
EP0070552A3 (en) * 1981-07-20 1985-05-22 Kabushiki Kaisha Toshiba Optical head
EP0423295B1 (en) * 1989-04-25 1996-01-24 Thomson-Csf Optical reading device for an optical recording medium

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