JPS6464127A - Optical head of optical axis correcting system - Google Patents

Optical head of optical axis correcting system

Info

Publication number
JPS6464127A
JPS6464127A JP62221762A JP22176287A JPS6464127A JP S6464127 A JPS6464127 A JP S6464127A JP 62221762 A JP62221762 A JP 62221762A JP 22176287 A JP22176287 A JP 22176287A JP S6464127 A JPS6464127 A JP S6464127A
Authority
JP
Japan
Prior art keywords
light
optical system
error signal
misalignment
detecting
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
JP62221762A
Other languages
Japanese (ja)
Inventor
Koji Ichikawa
Akira Saito
Masamichi Ito
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 JP62221762A priority Critical patent/JPS6464127A/en
Publication of JPS6464127A publication Critical patent/JPS6464127A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To detect the misalignment without exerting any undesirable influence on a recording/reproducing optical system, by detecting a misalignment quantity of a return light from a difference of the light receiving quantity of a light receiving and detecting part, and detecting a track error signal obtained from the return light, based on the misalignment quantity. CONSTITUTION:A light beam which is emitted by a semiconductor laser 16 becomes parallel by a collimator lens 17, and a parallel light beam 21 is formed. This beam 21 is made incident on a variable optical system 23 through a polarization beam splitter 18 and a 1/4 wavelength plate 19, reflected by a mirror 24 and goes to a light spot by an objective lens 25. Subsequently, a return light 22 which is reflected by the recording surface of an optical disk 27 advances to a static optical system 20 from the optical system 23. This light goes to an S polarized light from a P polarized light by passing through the plate 19 two times, and brought to total reflection in the direction orthogonal to the direction of going by the next splitter 18. This light 22 is separated into light receiving analyzers D-I, D-II for reflecting it by a half mirror 14, or allowing it to transmit through, through a lens 15, calculated by circuits 11-I, 11-II and amplifiers 12, 13, and a focal error signal AF and an error signal TR' are obtained.
JP62221762A 1987-09-04 1987-09-04 Optical head of optical axis correcting system Pending JPS6464127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62221762A JPS6464127A (en) 1987-09-04 1987-09-04 Optical head of optical axis correcting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62221762A JPS6464127A (en) 1987-09-04 1987-09-04 Optical head of optical axis correcting system

Publications (1)

Publication Number Publication Date
JPS6464127A true JPS6464127A (en) 1989-03-10

Family

ID=16771804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62221762A Pending JPS6464127A (en) 1987-09-04 1987-09-04 Optical head of optical axis correcting system

Country Status (1)

Country Link
JP (1) JPS6464127A (en)

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