JPS5794941A - Optical information detector - Google Patents

Optical information detector

Info

Publication number
JPS5794941A
JPS5794941A JP4528781A JP4528781A JPS5794941A JP S5794941 A JPS5794941 A JP S5794941A JP 4528781 A JP4528781 A JP 4528781A JP 4528781 A JP4528781 A JP 4528781A JP S5794941 A JPS5794941 A JP S5794941A
Authority
JP
Japan
Prior art keywords
convergent lens
light beam
optical axis
error signal
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.)
Granted
Application number
JP4528781A
Other languages
Japanese (ja)
Other versions
JPS5927972B2 (en
Inventor
Kenjiro Goto
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.)
Mansei Kogyo KK
Original Assignee
Mansei Kogyo KK
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 Mansei Kogyo KK filed Critical Mansei Kogyo KK
Priority to JP56045287A priority Critical patent/JPS5927972B2/en
Publication of JPS5794941A publication Critical patent/JPS5794941A/en
Publication of JPS5927972B2 publication Critical patent/JPS5927972B2/en
Expired 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

Landscapes

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

Abstract

PURPOSE:To obtain an accurate information signal and an accurate focus error signal by one light beam by setting the optical axis of a convergent lens perpendicular to a disk and by aligning the optical axis to the center line of the light beam. CONSTITUTION:A light beam 5 is incident to the entire aperture part of a convergent lens 10 from below so that an optical axis 10a and a center axis 5a are coincident with each other, and this light beam 5 is reduced through the convergent lens 10 to be focused on a disk 1 as a fine spot. Light diffracted by a pit 2 is made incident to a four-split type photoelectric element 11 which has a through-hole 11a concentric with the convergent lens 10 at the upper position of the convergent lens 10. Its outputs are synthesized to obtain a tracking error signal and a focus error signal is also obtained by a differential photoelectric element 9.
JP56045287A 1981-03-27 1981-03-27 optical information detection device Expired JPS5927972B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045287A JPS5927972B2 (en) 1981-03-27 1981-03-27 optical information detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045287A JPS5927972B2 (en) 1981-03-27 1981-03-27 optical information detection device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP11142076A Division JPS5336418A (en) 1976-09-17 1976-09-17 Device for reading optical information

Publications (2)

Publication Number Publication Date
JPS5794941A true JPS5794941A (en) 1982-06-12
JPS5927972B2 JPS5927972B2 (en) 1984-07-10

Family

ID=12715091

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045287A Expired JPS5927972B2 (en) 1981-03-27 1981-03-27 optical information detection device

Country Status (1)

Country Link
JP (1) JPS5927972B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876841A (en) * 1972-05-11 1975-04-08 Philips Corp Apparatus for reading a flat reflecting record carrier with autofocusing means

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876841A (en) * 1972-05-11 1975-04-08 Philips Corp Apparatus for reading a flat reflecting record carrier with autofocusing means

Also Published As

Publication number Publication date
JPS5927972B2 (en) 1984-07-10

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