JPH058499B2 - - Google Patents

Info

Publication number
JPH058499B2
JPH058499B2 JP59161876A JP16187684A JPH058499B2 JP H058499 B2 JPH058499 B2 JP H058499B2 JP 59161876 A JP59161876 A JP 59161876A JP 16187684 A JP16187684 A JP 16187684A JP H058499 B2 JPH058499 B2 JP H058499B2
Authority
JP
Japan
Prior art keywords
disk
half mirror
information track
optical path
astigmatism
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
JP59161876A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6139942A (ja
Inventor
Hiroyuki Nakamura
Masayuki Ito
Toshiki Matsuno
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP16187684A priority Critical patent/JPS6139942A/ja
Publication of JPS6139942A publication Critical patent/JPS6139942A/ja
Publication of JPH058499B2 publication Critical patent/JPH058499B2/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP16187684A 1984-08-01 1984-08-01 光ピツクアツプ Granted JPS6139942A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16187684A JPS6139942A (ja) 1984-08-01 1984-08-01 光ピツクアツプ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16187684A JPS6139942A (ja) 1984-08-01 1984-08-01 光ピツクアツプ

Publications (2)

Publication Number Publication Date
JPS6139942A JPS6139942A (ja) 1986-02-26
JPH058499B2 true JPH058499B2 (en, 2012) 1993-02-02

Family

ID=15743654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16187684A Granted JPS6139942A (ja) 1984-08-01 1984-08-01 光ピツクアツプ

Country Status (1)

Country Link
JP (1) JPS6139942A (en, 2012)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6310326A (ja) * 1986-07-01 1988-01-16 Sanyo Electric Co Ltd 光ピツクアツプ装置
JPH064412Y2 (ja) * 1988-07-27 1994-02-02 パイオニア株式会社 光ピックアップ装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337722A (en) * 1976-09-20 1978-04-07 Ebata Shiyouji Kk Method of producing concrete piles
NL7703076A (nl) * 1977-03-22 1978-09-26 Philips Nv Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.

Also Published As

Publication number Publication date
JPS6139942A (ja) 1986-02-26

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