JPS5744236A - Optical information reproducer - Google Patents

Optical information reproducer

Info

Publication number
JPS5744236A
JPS5744236A JP55120045A JP12004580A JPS5744236A JP S5744236 A JPS5744236 A JP S5744236A JP 55120045 A JP55120045 A JP 55120045A JP 12004580 A JP12004580 A JP 12004580A JP S5744236 A JPS5744236 A JP S5744236A
Authority
JP
Japan
Prior art keywords
shift
lens
detectors
shielder
caused
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
JP55120045A
Other languages
Japanese (ja)
Inventor
Ikuo Matsuda
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55120045A priority Critical patent/JPS5744236A/en
Priority to DE19813134100 priority patent/DE3134100A1/en
Priority to FR8116488A priority patent/FR2489574A1/en
Publication of JPS5744236A publication Critical patent/JPS5744236A/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • 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
    • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1359—Single prisms
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders

Abstract

PURPOSE: To realize the installation of a detector that detects the focusing shift and the tracking shift within a plane that crosses the same area on the optical axis, by using a cylindrical lens in a combination of a Foucault system and a far-field system.
CONSTITUTION: The parallel light flux 20 reflected from a disk is cut to about half by a wedge-type light shielder 21 and made incident to a 4-split photodetector 24 after passing through a detector lens 22 and a cylindrical lens 23. In this case, the direction of the edge of the shielder 21 that shields the light is perpendicular to the track direction F. Two different focuses B and A are caused in the direction perpendicular to the axial direction of the lens 23. Accordingly, a spot shown by a dotted line is caused, and the focusing shift and the tracking shift are detected by detection signals (a+b)-(c+d) and (a+d)-(b+c) of detectors 24aW24d, respectively. Thus these detectors can be distributed on the same plane.
COPYRIGHT: (C)1982,JPO&Japio
JP55120045A 1980-08-29 1980-08-29 Optical information reproducer Pending JPS5744236A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP55120045A JPS5744236A (en) 1980-08-29 1980-08-29 Optical information reproducer
DE19813134100 DE3134100A1 (en) 1980-08-29 1981-08-28 Optoelectronic focusing and tracking detection system
FR8116488A FR2489574A1 (en) 1980-08-29 1981-08-28 OPTO-ELECTRONIC SYSTEM FOR DETECTION OF FOCUSING AND EXACT TRACK ADJUSTMENT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55120045A JPS5744236A (en) 1980-08-29 1980-08-29 Optical information reproducer

Publications (1)

Publication Number Publication Date
JPS5744236A true JPS5744236A (en) 1982-03-12

Family

ID=14776526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55120045A Pending JPS5744236A (en) 1980-08-29 1980-08-29 Optical information reproducer

Country Status (3)

Country Link
JP (1) JPS5744236A (en)
DE (1) DE3134100A1 (en)
FR (1) FR2489574A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
JPS57195634U (en) * 1981-06-05 1982-12-11
DE3280232D1 (en) * 1981-06-22 1990-09-27 Toshiba Kawasaki Kk OPTICAL HEAD.
JPS59167858A (en) * 1983-03-15 1984-09-21 Toshiba Corp Optical head
JPS61177645A (en) * 1985-01-31 1986-08-09 Fujitsu Ltd Focus error control system

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR205243A1 (en) * 1972-05-11 1976-04-21 Philips Nv APPARATUS FOR READING A FLAT REFLECTOR RECORDING CARRIER
US4150399A (en) * 1974-11-13 1979-04-17 U.S. Philips Corporation Apparatus for reading a record carrier with an optical information structure
FR2313716A1 (en) * 1975-06-03 1976-12-31 Thomson Brandt OPTICAL READING SYSTEM BY REFLECTION OF AN INFORMATION MEDIA
NL182990C (en) * 1975-07-07 1988-06-16 Philips Nv DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.
FR2325953A1 (en) * 1975-09-29 1977-04-22 Thomson Brandt OPTICAL FOCUSING SENSOR AND FOCUSING DEVICE INCLUDING SUCH A SENSOR
FR2325987A1 (en) * 1975-09-29 1977-04-22 Thomson Brandt OPTICAL READING DEVICE FOR A RECORDING
US4025949A (en) * 1975-12-31 1977-05-24 Zenith Radio Corporation Symmetrical astigmatic focus sensing system
GB1532345A (en) * 1976-06-25 1978-11-15 Hitachi Ltd Information play-back apparatus
US4290132A (en) * 1977-05-11 1981-09-15 Pioneer Electronic Corporation Focus servo device for use in an optical information read-out device
NL7803969A (en) * 1978-04-14 1979-10-16 Philips Nv OPTO-ELECTRONIC FOCUS ERROR DETECTION SYSTEM.
JPS54155832A (en) * 1978-05-30 1979-12-08 Canon Inc Focusing detector
JPS55927A (en) * 1978-06-16 1980-01-07 Pioneer Video Corp Focus servo unit of optical information reader
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader
GB2057218B (en) * 1979-06-25 1984-02-29 Olympus Optical Co Detecting focussing error
FR2460523A1 (en) * 1979-06-29 1981-01-23 Thomson Csf SEMICONDUCTOR LASER SOURCE OPTICAL READING HEAD AND DEVICE FOR REFLECTING AN INFORMATION MEDIUM COMPRISING SUCH AN OPTICAL HEAD

Also Published As

Publication number Publication date
DE3134100A1 (en) 1982-06-09
FR2489574A1 (en) 1982-03-05

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