JPS57210458A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS57210458A
JPS57210458A JP56096130A JP9613081A JPS57210458A JP S57210458 A JPS57210458 A JP S57210458A JP 56096130 A JP56096130 A JP 56096130A JP 9613081 A JP9613081 A JP 9613081A JP S57210458 A JPS57210458 A JP S57210458A
Authority
JP
Japan
Prior art keywords
recording medium
optical reader
light beam
read
parallel beam
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
JP56096130A
Other languages
Japanese (ja)
Inventor
Susumu Sakano
Yuji Takeda
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56096130A priority Critical patent/JPS57210458A/en
Publication of JPS57210458A publication Critical patent/JPS57210458A/en
Pending 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To eliminate the influence of the upward and downward movement of a recording medium, by collimating a read light beam with which the recording medium is irradiated. CONSTITUTION:A light beam emitted 2 from a semiconductor laser 1 is passed through the 1st and 2nd convergent lenses 10 and 11 to obtain a parallel beam, which is reflected by a recording medium to illuminate a detector 9. The parallel beam has a 0.6mum diameter. Consequently, even when a recording medium moves up and down, recorded information is read.
JP56096130A 1981-06-22 1981-06-22 Optical reader Pending JPS57210458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56096130A JPS57210458A (en) 1981-06-22 1981-06-22 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56096130A JPS57210458A (en) 1981-06-22 1981-06-22 Optical reader

Publications (1)

Publication Number Publication Date
JPS57210458A true JPS57210458A (en) 1982-12-24

Family

ID=14156799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56096130A Pending JPS57210458A (en) 1981-06-22 1981-06-22 Optical reader

Country Status (1)

Country Link
JP (1) JPS57210458A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181879A (en) * 1984-02-29 1985-09-17 Toshiba Corp Photoelectric converting device
JPS61155967U (en) * 1985-03-20 1986-09-27
JPS6284440A (en) * 1985-10-09 1987-04-17 Mitsubishi Electric Corp Information reader on surface of flat recording medium
JPS6372655U (en) * 1986-10-25 1988-05-16

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181879A (en) * 1984-02-29 1985-09-17 Toshiba Corp Photoelectric converting device
JPH057750B2 (en) * 1984-02-29 1993-01-29 Tokyo Shibaura Electric Co
JPS61155967U (en) * 1985-03-20 1986-09-27
JPS6284440A (en) * 1985-10-09 1987-04-17 Mitsubishi Electric Corp Information reader on surface of flat recording medium
JPS6372655U (en) * 1986-10-25 1988-05-16

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