JPS5641A - Processor for optical information - Google Patents

Processor for optical information

Info

Publication number
JPS5641A
JPS5641A JP7466479A JP7466479A JPS5641A JP S5641 A JPS5641 A JP S5641A JP 7466479 A JP7466479 A JP 7466479A JP 7466479 A JP7466479 A JP 7466479A JP S5641 A JPS5641 A JP S5641A
Authority
JP
Japan
Prior art keywords
coupling lens
disc
isotropic
numerical aperture
range
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.)
Granted
Application number
JP7466479A
Other languages
Japanese (ja)
Other versions
JPS6153775B2 (en
Inventor
Seiji Yonezawa
Toshio Sugiyama
Masahiro Oshima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7466479A priority Critical patent/JPS5641A/en
Priority to US06/152,297 priority patent/US4333173A/en
Priority to FR8013059A priority patent/FR2459513B1/en
Priority to NL8003411A priority patent/NL8003411A/en
Priority to DE19803022299 priority patent/DE3022299A1/en
Priority to CA000353936A priority patent/CA1136273A/en
Priority to GB8019469A priority patent/GB2053553B/en
Publication of JPS5641A publication Critical patent/JPS5641A/en
Publication of JPS6153775B2 publication Critical patent/JPS6153775B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives
    • G02B13/10—Anamorphotic objectives involving prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0972—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
    • G11B7/08—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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • G11B7/13—Optical detectors therefor
    • 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
    • G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section

Abstract

PURPOSE:To form the spot of all directions on the disc efficiently and to enable to increase the range of automatic focus drawing, by increasing the numerical aperture of coupling lens and locating the prism at the post stage of the coupling lens. CONSTITUTION:To the semiconductor laser element 1 having non-isotropic spread angle, the coupling lens has greate automatic focussing drawing range to greater numberical aperture allowing to realize perfect automatic focussing to the up and down movement of the disc 4. Then, by using the coupling lens 2 having greater numerical aperture and inserting the prism 7 immediately after the coupling lens 2, the conversion of isotropic beam can be made. This light beam can obtain the isotropic spot 5 on the disc 4 by means of the objective lens 3, and since the numerical aperture of the coupling lens 2 is taken greater, the feedback of reflection light to the semiconductor laser 1 is greater, allowing to extend the range of automatic focus drawing.
JP7466479A 1979-06-15 1979-06-15 Processor for optical information Granted JPS5641A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP7466479A JPS5641A (en) 1979-06-15 1979-06-15 Processor for optical information
US06/152,297 US4333173A (en) 1979-06-15 1980-05-22 Optical information processor with prismatic correction of laser beam shape
FR8013059A FR2459513B1 (en) 1979-06-15 1980-06-12 OPTICAL INFORMATION PROCESSING UNIT
NL8003411A NL8003411A (en) 1979-06-15 1980-06-12 DEVICE FOR PROCESSING OPTICAL INFORMATION.
DE19803022299 DE3022299A1 (en) 1979-06-15 1980-06-13 OPTICAL INFORMATION PROCESSING DEVICE
CA000353936A CA1136273A (en) 1979-06-15 1980-06-13 Optical information processor
GB8019469A GB2053553B (en) 1979-06-15 1980-06-13 Optical information processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7466479A JPS5641A (en) 1979-06-15 1979-06-15 Processor for optical information

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP60220062A Division JPS61216145A (en) 1985-10-04 1985-10-04 Optical information processor
JP60220061A Division JPS61216144A (en) 1985-10-04 1985-10-04 Optical information processor

Publications (2)

Publication Number Publication Date
JPS5641A true JPS5641A (en) 1981-01-06
JPS6153775B2 JPS6153775B2 (en) 1986-11-19

Family

ID=13553719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7466479A Granted JPS5641A (en) 1979-06-15 1979-06-15 Processor for optical information

Country Status (1)

Country Link
JP (1) JPS5641A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58218906A (en) * 1982-06-15 1983-12-20 株式会社ダイキ Accessory producing apparatus
JPS59110048A (en) * 1982-12-15 1984-06-25 Hitachi Ltd Reproducing device for semiconductor laser information
JPS6289018A (en) * 1985-10-15 1987-04-23 Konishiroku Photo Ind Co Ltd Beam shaping optical system
JPS62298034A (en) * 1986-06-17 1987-12-25 Nec Corp Optical head
JPH06195743A (en) * 1992-09-10 1994-07-15 Toshiba Corp Optical head apparatus
US6154433A (en) * 1992-09-10 2000-11-28 Kabushiki Kaisha Toshiba Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01267585A (en) * 1988-04-19 1989-10-25 Kazuhiro Hase Magnetic field distribution display tool

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50147341A (en) * 1974-05-15 1975-11-26
JPS5153833A (en) * 1974-11-06 1976-05-12 Nippon Selfoc Co Ltd HIKARIBIIMUHENKANBUNKATSUKI
JPS5184206A (en) * 1974-12-09 1976-07-23 Teletype Corp
JPS5224542A (en) * 1975-08-20 1977-02-24 Canon Inc Optical system for shaping a beam
JPS5265406A (en) * 1975-11-27 1977-05-30 Hitachi Ltd Inforamtion reproduction device
JPS5348504A (en) * 1976-10-13 1978-05-02 Matsushita Electric Ind Co Ltd Optical recorder/reproducer
JPS53100844A (en) * 1977-02-15 1978-09-02 Canon Inc Beam shaping optical system
JPS5455184A (en) * 1977-10-11 1979-05-02 Canon Inc Semiconductor laser light source unit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50147341A (en) * 1974-05-15 1975-11-26
JPS5153833A (en) * 1974-11-06 1976-05-12 Nippon Selfoc Co Ltd HIKARIBIIMUHENKANBUNKATSUKI
JPS5184206A (en) * 1974-12-09 1976-07-23 Teletype Corp
JPS5224542A (en) * 1975-08-20 1977-02-24 Canon Inc Optical system for shaping a beam
JPS5265406A (en) * 1975-11-27 1977-05-30 Hitachi Ltd Inforamtion reproduction device
JPS5348504A (en) * 1976-10-13 1978-05-02 Matsushita Electric Ind Co Ltd Optical recorder/reproducer
JPS53100844A (en) * 1977-02-15 1978-09-02 Canon Inc Beam shaping optical system
JPS5455184A (en) * 1977-10-11 1979-05-02 Canon Inc Semiconductor laser light source unit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58218906A (en) * 1982-06-15 1983-12-20 株式会社ダイキ Accessory producing apparatus
JPS6132005B2 (en) * 1982-06-15 1986-07-24 Daiki Kk
JPS59110048A (en) * 1982-12-15 1984-06-25 Hitachi Ltd Reproducing device for semiconductor laser information
JPS6289018A (en) * 1985-10-15 1987-04-23 Konishiroku Photo Ind Co Ltd Beam shaping optical system
JPH0533767B2 (en) * 1985-10-15 1993-05-20 Konishiroku Photo Ind
JPS62298034A (en) * 1986-06-17 1987-12-25 Nec Corp Optical head
JPH06195743A (en) * 1992-09-10 1994-07-15 Toshiba Corp Optical head apparatus
US6154433A (en) * 1992-09-10 2000-11-28 Kabushiki Kaisha Toshiba Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head

Also Published As

Publication number Publication date
JPS6153775B2 (en) 1986-11-19

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