JPH0424768B2 - - Google Patents

Info

Publication number
JPH0424768B2
JPH0424768B2 JP57227315A JP22731582A JPH0424768B2 JP H0424768 B2 JPH0424768 B2 JP H0424768B2 JP 57227315 A JP57227315 A JP 57227315A JP 22731582 A JP22731582 A JP 22731582A JP H0424768 B2 JPH0424768 B2 JP H0424768B2
Authority
JP
Japan
Prior art keywords
light
photodetector
beam splitter
lens
focusing means
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
JP57227315A
Other languages
English (en)
Japanese (ja)
Other versions
JPS59121634A (ja
Inventor
Fumitaka Kotaka
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP22731582A priority Critical patent/JPS59121634A/ja
Publication of JPS59121634A publication Critical patent/JPS59121634A/ja
Publication of JPH0424768B2 publication Critical patent/JPH0424768B2/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)
JP22731582A 1982-12-28 1982-12-28 光学的ピツクアツプ装置における焦点検出装置 Granted JPS59121634A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22731582A JPS59121634A (ja) 1982-12-28 1982-12-28 光学的ピツクアツプ装置における焦点検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22731582A JPS59121634A (ja) 1982-12-28 1982-12-28 光学的ピツクアツプ装置における焦点検出装置

Publications (2)

Publication Number Publication Date
JPS59121634A JPS59121634A (ja) 1984-07-13
JPH0424768B2 true JPH0424768B2 (ko) 1992-04-28

Family

ID=16858871

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22731582A Granted JPS59121634A (ja) 1982-12-28 1982-12-28 光学的ピツクアツプ装置における焦点検出装置

Country Status (1)

Country Link
JP (1) JPS59121634A (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2638778B2 (ja) * 1986-03-18 1997-08-06 日本電気株式会社 光ヘツド装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683849A (en) * 1979-12-11 1981-07-08 Matsushita Electric Ind Co Ltd Optical information reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683849A (en) * 1979-12-11 1981-07-08 Matsushita Electric Ind Co Ltd Optical information reader

Also Published As

Publication number Publication date
JPS59121634A (ja) 1984-07-13

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