JPH0311007B2 - - Google Patents

Info

Publication number
JPH0311007B2
JPH0311007B2 JP56172400A JP17240081A JPH0311007B2 JP H0311007 B2 JPH0311007 B2 JP H0311007B2 JP 56172400 A JP56172400 A JP 56172400A JP 17240081 A JP17240081 A JP 17240081A JP H0311007 B2 JPH0311007 B2 JP H0311007B2
Authority
JP
Japan
Prior art keywords
light
output
photodetectors
detector
disk
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.)
Expired - Lifetime
Application number
JP56172400A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5873024A (ja
Inventor
Kaneki Matsui
Haruhisa Takiguchi
Yukio Kurata
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP56172400A priority Critical patent/JPS5873024A/ja
Publication of JPS5873024A publication Critical patent/JPS5873024A/ja
Publication of JPH0311007B2 publication Critical patent/JPH0311007B2/ja
Granted 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
    • G11B7/13—Optical detectors therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP56172400A 1981-10-27 1981-10-27 光学式情報処理装置 Granted JPS5873024A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56172400A JPS5873024A (ja) 1981-10-27 1981-10-27 光学式情報処理装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56172400A JPS5873024A (ja) 1981-10-27 1981-10-27 光学式情報処理装置

Publications (2)

Publication Number Publication Date
JPS5873024A JPS5873024A (ja) 1983-05-02
JPH0311007B2 true JPH0311007B2 (it) 1991-02-15

Family

ID=15941236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56172400A Granted JPS5873024A (ja) 1981-10-27 1981-10-27 光学式情報処理装置

Country Status (1)

Country Link
JP (1) JPS5873024A (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742218A (en) * 1985-03-11 1988-05-03 Hitachi, Ltd. Focus error detection apparatus utilizing focusing an front and rear sides of focal planes
JPH05210858A (ja) * 1991-10-29 1993-08-20 Internatl Business Mach Corp <Ibm> サーボ・クロストークを減少させるための収差補償を備えた光学式データ記憶システム
JP2685015B2 (ja) * 1995-03-17 1997-12-03 株式会社日立製作所 光ディスク装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53100203A (en) * 1977-02-15 1978-09-01 Mitsubishi Electric Corp Optical reproducer
JPS53123103A (en) * 1977-04-02 1978-10-27 Mansei Kogyo Kk Optical information reader

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53100203A (en) * 1977-02-15 1978-09-01 Mitsubishi Electric Corp Optical reproducer
JPS53123103A (en) * 1977-04-02 1978-10-27 Mansei Kogyo Kk Optical information reader

Also Published As

Publication number Publication date
JPS5873024A (ja) 1983-05-02

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