JPS639305B2 - - Google Patents

Info

Publication number
JPS639305B2
JPS639305B2 JP10635380A JP10635380A JPS639305B2 JP S639305 B2 JPS639305 B2 JP S639305B2 JP 10635380 A JP10635380 A JP 10635380A JP 10635380 A JP10635380 A JP 10635380A JP S639305 B2 JPS639305 B2 JP S639305B2
Authority
JP
Japan
Prior art keywords
light
prism
polarized light
incident
objective lens
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
Application number
JP10635380A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5733443A (en
Inventor
Tooru Musha
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP10635380A priority Critical patent/JPS5733443A/ja
Publication of JPS5733443A publication Critical patent/JPS5733443A/ja
Publication of JPS639305B2 publication Critical patent/JPS639305B2/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
    • G11B7/08—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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP10635380A 1980-08-04 1980-08-04 Focus detector Granted JPS5733443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10635380A JPS5733443A (en) 1980-08-04 1980-08-04 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10635380A JPS5733443A (en) 1980-08-04 1980-08-04 Focus detector

Publications (2)

Publication Number Publication Date
JPS5733443A JPS5733443A (en) 1982-02-23
JPS639305B2 true JPS639305B2 (xx) 1988-02-26

Family

ID=14431405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10635380A Granted JPS5733443A (en) 1980-08-04 1980-08-04 Focus detector

Country Status (1)

Country Link
JP (1) JPS5733443A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0288801A (ja) * 1988-09-24 1990-03-29 Haiteku Mokuzai Sangyo Kk 路面等の舗装方法
JPH02120504U (xx) * 1989-03-14 1990-09-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0288801A (ja) * 1988-09-24 1990-03-29 Haiteku Mokuzai Sangyo Kk 路面等の舗装方法
JPH02120504U (xx) * 1989-03-14 1990-09-28

Also Published As

Publication number Publication date
JPS5733443A (en) 1982-02-23

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