JPH057769B2 - - Google Patents

Info

Publication number
JPH057769B2
JPH057769B2 JP57079911A JP7991182A JPH057769B2 JP H057769 B2 JPH057769 B2 JP H057769B2 JP 57079911 A JP57079911 A JP 57079911A JP 7991182 A JP7991182 A JP 7991182A JP H057769 B2 JPH057769 B2 JP H057769B2
Authority
JP
Japan
Prior art keywords
optical
lens
reflected light
astigmatism
concave 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 - Lifetime
Application number
JP57079911A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58199447A (ja
Inventor
Hideo Suenaga
Toshio Sugyama
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 JP57079911A priority Critical patent/JPS58199447A/ja
Publication of JPS58199447A publication Critical patent/JPS58199447A/ja
Publication of JPH057769B2 publication Critical patent/JPH057769B2/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

Landscapes

  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
JP57079911A 1982-05-14 1982-05-14 光学式読取装置 Granted JPS58199447A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57079911A JPS58199447A (ja) 1982-05-14 1982-05-14 光学式読取装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57079911A JPS58199447A (ja) 1982-05-14 1982-05-14 光学式読取装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP5311493A Division JPH0827947B2 (ja) 1993-12-13 1993-12-13 光学式トラッキングエラー検出方法及び検出機構

Publications (2)

Publication Number Publication Date
JPS58199447A JPS58199447A (ja) 1983-11-19
JPH057769B2 true JPH057769B2 (en]) 1993-01-29

Family

ID=13703465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57079911A Granted JPS58199447A (ja) 1982-05-14 1982-05-14 光学式読取装置

Country Status (1)

Country Link
JP (1) JPS58199447A (en])

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958637A (ja) * 1982-09-28 1984-04-04 Sony Corp 光学式再生装置
JPS6235421U (en]) * 1985-08-16 1987-03-02
US5623509A (en) * 1994-03-01 1997-04-22 Seiko Epson Corporation Semiconductor laser and light-sensing device using the same

Family Cites Families (4)

* 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
JPS54133354A (en) * 1978-04-07 1979-10-17 Hitachi Ltd Optical system
JPS5935875Y2 (ja) * 1978-10-24 1984-10-03 三洋電機株式会社 焦点位置検出装置
JPS6012693B2 (ja) * 1979-01-22 1985-04-03 日本ビクター株式会社 光学的情報再生装置における自動焦点合せ装置

Also Published As

Publication number Publication date
JPS58199447A (ja) 1983-11-19

Similar Documents

Publication Publication Date Title
CA1203621A (en) Optical head in a recording and reading device for a data carrier
HK76293A (en) Optical scanning device, mirror objective suitable for use therein and an optical recording and/or reproducing apparatus provided therewith
US4924082A (en) Optical scanning device, mirror objective suitable for use in said device and optical write and/or read apparatus provided with said device
JPS6334532B2 (en])
US4940890A (en) Optical scanning device, mirror objective suitable for use in said device and optical write and/or read apparatus provided with said device
JPH057769B2 (en])
JPS6322370B2 (en])
JPH0460931A (ja) 光ピックアップ
JP2656036B2 (ja) 光ヘツド
JPS6123575B2 (en])
JP2636245B2 (ja) 光磁気記憶用光ヘッド
JPS63247925A (ja) 光ヘツド
JPS6213231Y2 (en])
JPH06203400A (ja) 光学式トラッキングエラー検出方法及び検出機構
JPS62145545A (ja) ピツクアツプ装置
JP2506972B2 (ja) 光ピックアップ装置
JP4776601B2 (ja) 光ピックアップ装置
JP2655747B2 (ja) 光ピックアップ
JP2790264B2 (ja) 光ピックアップ
JPH0714205A (ja) 光学ヘッドおよび調整方法
JPH0519853Y2 (en])
JP2009080882A (ja) 光ピックアップ装置
JPS63136334A (ja) 光ヘツド装置
JPS59231738A (ja) 光ピツクアツプ
JPS62248139A (ja) 焦点検出装置