JPS56169233A - Reproducer for optical rotary disk - Google Patents

Reproducer for optical rotary disk

Info

Publication number
JPS56169233A
JPS56169233A JP7337880A JP7337880A JPS56169233A JP S56169233 A JPS56169233 A JP S56169233A JP 7337880 A JP7337880 A JP 7337880A JP 7337880 A JP7337880 A JP 7337880A JP S56169233 A JPS56169233 A JP S56169233A
Authority
JP
Japan
Prior art keywords
spot
disk
reduction
spot diameter
driven
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
JP7337880A
Other languages
Japanese (ja)
Inventor
Kazuo Mori
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7337880A priority Critical patent/JPS56169233A/en
Publication of JPS56169233A publication Critical patent/JPS56169233A/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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces

Abstract

PURPOSE:To lessen deterioration in S/N ratio due to a level difference of a reproduced signal and reduction in the quantity of light, by adjusting a spot diameter on a disk to the best state at any time according to the radius position of the spot. CONSTITUTION:The rotational frequency of a radical feed motor 15 is measured by a position detecting circuit 34: and the feed motor is driven through an amplifier 35, and a supporting base 39 for a diffusion lens 5 is also driven through a reduction gear 37 and a fine adjustment device 38. When the gain is so adjusted in advance that the best spot diameters are obtained at the internal circumference and external circumference of a disk 1, a spot diameter between the both is adjusted to the best value automatically. As the position of the spot gets closer and closer to the external circumference of the disk 1, the supporting base 39 for the diffusion lens 5 is moved as shown by an arrow 40 to increase the spot diameter. Consequently, deterioration in S/N ratio due to a level difference of a reproduced signal and reduction in the quantity of light is lessened.
JP7337880A 1980-05-28 1980-05-28 Reproducer for optical rotary disk Pending JPS56169233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7337880A JPS56169233A (en) 1980-05-28 1980-05-28 Reproducer for optical rotary disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7337880A JPS56169233A (en) 1980-05-28 1980-05-28 Reproducer for optical rotary disk

Publications (1)

Publication Number Publication Date
JPS56169233A true JPS56169233A (en) 1981-12-25

Family

ID=13516455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7337880A Pending JPS56169233A (en) 1980-05-28 1980-05-28 Reproducer for optical rotary disk

Country Status (1)

Country Link
JP (1) JPS56169233A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614176A1 (en) * 1993-03-04 1994-09-07 Nikon Corporation Optical disk reproducing method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614176A1 (en) * 1993-03-04 1994-09-07 Nikon Corporation Optical disk reproducing method and apparatus

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