JPS5465007A - Disc form recording carrier reader - Google Patents

Disc form recording carrier reader

Info

Publication number
JPS5465007A
JPS5465007A JP13170677A JP13170677A JPS5465007A JP S5465007 A JPS5465007 A JP S5465007A JP 13170677 A JP13170677 A JP 13170677A JP 13170677 A JP13170677 A JP 13170677A JP S5465007 A JPS5465007 A JP S5465007A
Authority
JP
Japan
Prior art keywords
light
conical body
recording carrier
disc
disc form
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.)
Granted
Application number
JP13170677A
Other languages
Japanese (ja)
Other versions
JPS5757769B2 (en
Inventor
Toshiaki Kashihara
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 JP13170677A priority Critical patent/JPS5465007A/en
Publication of JPS5465007A publication Critical patent/JPS5465007A/en
Publication of JPS5757769B2 publication Critical patent/JPS5757769B2/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To accurately read the signal on a disc by photoelectrically detecting the components distributing other than the exit light conical body of a read objective lens. CONSTITUTION:The light emitted and condensed from a read objective lens 26 radiates the pits 31 on a disc 31. The light having been reflected and refracted after radiating the pits 31 assumes a distribution like 29, becoming such that the light also exists other than the exit light conical body. The distribution of the largest quantity of light other than the exit light conical body is when the pit depth is lambda/ 4. This quantity of light is detected with photoelectric detectors 32, 33.
JP13170677A 1977-11-02 1977-11-02 Disc form recording carrier reader Granted JPS5465007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13170677A JPS5465007A (en) 1977-11-02 1977-11-02 Disc form recording carrier reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13170677A JPS5465007A (en) 1977-11-02 1977-11-02 Disc form recording carrier reader

Publications (2)

Publication Number Publication Date
JPS5465007A true JPS5465007A (en) 1979-05-25
JPS5757769B2 JPS5757769B2 (en) 1982-12-06

Family

ID=15064290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13170677A Granted JPS5465007A (en) 1977-11-02 1977-11-02 Disc form recording carrier reader

Country Status (1)

Country Link
JP (1) JPS5465007A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5769534A (en) * 1980-10-15 1982-04-28 Hitachi Ltd Optical track tracing device
JPS57500852A (en) * 1980-06-20 1982-05-13
JPS59104334U (en) * 1982-12-28 1984-07-13 パイオニア株式会社 pick up device
JPH01125731A (en) * 1987-07-29 1989-05-18 Laser Magnetic Storage Internatl Co Apparatus for condensation and tracking in optical system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945924U (en) * 1972-07-26 1974-04-22
JPS4998113A (en) * 1972-12-26 1974-09-17

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945924U (en) * 1972-07-26 1974-04-22
JPS4998113A (en) * 1972-12-26 1974-09-17

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57500852A (en) * 1980-06-20 1982-05-13
JPS5769534A (en) * 1980-10-15 1982-04-28 Hitachi Ltd Optical track tracing device
JPS59104334U (en) * 1982-12-28 1984-07-13 パイオニア株式会社 pick up device
JPH01125731A (en) * 1987-07-29 1989-05-18 Laser Magnetic Storage Internatl Co Apparatus for condensation and tracking in optical system

Also Published As

Publication number Publication date
JPS5757769B2 (en) 1982-12-06

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