JPS57100636A - Optical information reader - Google Patents

Optical information reader

Info

Publication number
JPS57100636A
JPS57100636A JP17702480A JP17702480A JPS57100636A JP S57100636 A JPS57100636 A JP S57100636A JP 17702480 A JP17702480 A JP 17702480A JP 17702480 A JP17702480 A JP 17702480A JP S57100636 A JPS57100636 A JP S57100636A
Authority
JP
Japan
Prior art keywords
mirror
focus lens
error signal
lens
reflected
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
JP17702480A
Other languages
Japanese (ja)
Other versions
JPH0213374B2 (en
Inventor
Nobuyuki Kaneko
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.)
TRIO KENWOOD CORP
Trio KK
Kenwood KK
Original Assignee
TRIO KENWOOD CORP
Trio KK
Kenwood KK
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 TRIO KENWOOD CORP, Trio KK, Kenwood KK filed Critical TRIO KENWOOD CORP
Priority to JP17702480A priority Critical patent/JPS57100636A/en
Publication of JPS57100636A publication Critical patent/JPS57100636A/en
Publication of JPH0213374B2 publication Critical patent/JPH0213374B2/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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To increase frequency response range up to a high frequency band, by reducing the weight of a driving part by obtaining a beam which centers on the optical axis of a focus lens by displacing a mirror synchronizing with the parallel movement of the focus lens in a disk radius direction, and by making its reflected light incident to a disk. CONSTITUTION:Light emitted from a laser 7 is passed through a beam splitter 9 to obtain a parallel beam, which is reflected by a mirror 12 and then passed through an lambda/4 plate 10 and a focus lens 5 to be focused on a disk 1. Its reflected light travels backward, and is reflected by the beam splitter 9 to be focused on a detector 2 through a cylinder lens 8. A focus error signal and a tracking error signal are detected as an output difference (B1+B3)-(B2+B4) and a (B1+ B4)-(B2+B3). The tracking error signal is applied to driving devices which drives the focus lens 5 in a direction X and the mirror in an S, thereby moving the lens 5 and mirror 12 synchronously. Consequently, the weight of the driving part is reduced and frequency response range is increased.
JP17702480A 1980-12-15 1980-12-15 Optical information reader Granted JPS57100636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17702480A JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17702480A JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Publications (2)

Publication Number Publication Date
JPS57100636A true JPS57100636A (en) 1982-06-22
JPH0213374B2 JPH0213374B2 (en) 1990-04-04

Family

ID=16023817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17702480A Granted JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Country Status (1)

Country Link
JP (1) JPS57100636A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914138A (en) * 1982-07-14 1984-01-25 Minolta Camera Co Ltd Tracking control optical system of optical disk

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135340A (en) * 1979-04-06 1980-10-22 Discovision Ass Apparatus for keeping scanning means in place

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135340A (en) * 1979-04-06 1980-10-22 Discovision Ass Apparatus for keeping scanning means in place

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914138A (en) * 1982-07-14 1984-01-25 Minolta Camera Co Ltd Tracking control optical system of optical disk

Also Published As

Publication number Publication date
JPH0213374B2 (en) 1990-04-04

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