JPS57123538A - Optical pickup - Google Patents

Optical pickup

Info

Publication number
JPS57123538A
JPS57123538A JP56008394A JP839481A JPS57123538A JP S57123538 A JPS57123538 A JP S57123538A JP 56008394 A JP56008394 A JP 56008394A JP 839481 A JP839481 A JP 839481A JP S57123538 A JPS57123538 A JP S57123538A
Authority
JP
Japan
Prior art keywords
collimating lens
astigmatism
detector
optical pickup
astigmatic
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
JP56008394A
Other languages
Japanese (ja)
Other versions
JPS6115498B2 (en
Inventor
Riichi Saeki
Yoshio Miyake
Toshio Takei
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 JP56008394A priority Critical patent/JPS57123538A/en
Publication of JPS57123538A publication Critical patent/JPS57123538A/en
Publication of JPS6115498B2 publication Critical patent/JPS6115498B2/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
    • G11B7/0908—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 for focusing only

Abstract

PURPOSE:To reduce the size of an optical pickup by slantingly guiding reflected light to a collimating lens which has astigmatism and by obtaining the astigmatism by the collimating lens. CONSTITUTION:Laser light 2 emitted by a laser generation source 1 is collimated by a collimating lens 3 and made incident to a polarization beam splitter 4. The collimating lens 3 has neither spherical aberration nor coma aberration, but has astigmatism. Therefore, the laser light emitted from the collimating lens 3 strikes a four-quadrant detector 15 as astigmatic luminous flux. The astigmatic luminous flux is detected by the detector 15 to detect an out-of-focus state on a disk surface. Further, the laser generation source 1 and detector 15 are provided closely to each other, so they can be stored in one package.
JP56008394A 1981-01-22 1981-01-22 Optical pickup Granted JPS57123538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56008394A JPS57123538A (en) 1981-01-22 1981-01-22 Optical pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56008394A JPS57123538A (en) 1981-01-22 1981-01-22 Optical pickup

Publications (2)

Publication Number Publication Date
JPS57123538A true JPS57123538A (en) 1982-08-02
JPS6115498B2 JPS6115498B2 (en) 1986-04-24

Family

ID=11691968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56008394A Granted JPS57123538A (en) 1981-01-22 1981-01-22 Optical pickup

Country Status (1)

Country Link
JP (1) JPS57123538A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152549A (en) * 1983-02-18 1984-08-31 Canon Inc Optical pickup
JPS62129951A (en) * 1985-11-30 1987-06-12 Toshiba Corp Optical head
JPS63153732A (en) * 1986-12-18 1988-06-27 Canon Electronics Inc Focus detector
EP0722167A1 (en) * 1994-07-29 1996-07-17 Sony Corporation Optical pickup apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1298585C (en) * 1986-05-01 1992-04-07 Jeffrey C. Johnson Low velocity air seal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152549A (en) * 1983-02-18 1984-08-31 Canon Inc Optical pickup
JPH059855B2 (en) * 1983-02-18 1993-02-08 Canon Kk
JPS62129951A (en) * 1985-11-30 1987-06-12 Toshiba Corp Optical head
JPS63153732A (en) * 1986-12-18 1988-06-27 Canon Electronics Inc Focus detector
EP0722167A1 (en) * 1994-07-29 1996-07-17 Sony Corporation Optical pickup apparatus

Also Published As

Publication number Publication date
JPS6115498B2 (en) 1986-04-24

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