DE2453364B2 - - Google Patents

Info

Publication number
DE2453364B2
DE2453364B2 DE19742453364 DE2453364A DE2453364B2 DE 2453364 B2 DE2453364 B2 DE 2453364B2 DE 19742453364 DE19742453364 DE 19742453364 DE 2453364 A DE2453364 A DE 2453364A DE 2453364 B2 DE2453364 B2 DE 2453364B2
Authority
DE
Germany
Prior art keywords
signal
oscillator
lens
control signal
low
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
DE19742453364
Other languages
German (de)
English (en)
Other versions
DE2453364A1 (de
DE2453364C3 (de
Inventor
Shigeo Mitaka Kato
Takeshi Kokubungi Maeda
Seiji Hachioji Yonezawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Priority claimed from JP12539573A external-priority patent/JPS5078340A/ja
Priority claimed from JP3796674A external-priority patent/JPS50132939A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of DE2453364A1 publication Critical patent/DE2453364A1/de
Publication of DE2453364B2 publication Critical patent/DE2453364B2/de
Application granted granted Critical
Publication of DE2453364C3 publication Critical patent/DE2453364C3/de
Expired 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
DE19742453364 1973-11-09 1974-11-11 Automatische Fokussiervorrichtung Expired DE2453364C3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12539573A JPS5078340A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-09 1973-11-09
JP3796674A JPS50132939A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-04-05 1974-04-05

Publications (3)

Publication Number Publication Date
DE2453364A1 DE2453364A1 (de) 1975-05-28
DE2453364B2 true DE2453364B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-06-22
DE2453364C3 DE2453364C3 (de) 1979-02-22

Family

ID=26377151

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19742453364 Expired DE2453364C3 (de) 1973-11-09 1974-11-11 Automatische Fokussiervorrichtung

Country Status (3)

Country Link
DE (1) DE2453364C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2251021A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7414695A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015474A1 (de) * 1979-05-09 1980-11-13 Hitachi Ltd Vorrichtung zum steuern der stellung eines lichtstrahls
DE3147758A1 (de) * 1980-12-02 1982-07-01 Olympus Optical Co., Ltd., Tokyo Vorrichtung zum automatischen scharfeinstellen des objektivs einer fotografischen stehbildkamera, fernsehkamera oder dgl.
DE3913229A1 (de) * 1988-09-19 1990-03-22 Pioneer Electronic Corp Wiedergabegeraet fuer optische informationen
DE3934744A1 (de) * 1989-10-18 1991-04-25 Krupp Gmbh Verfahren zur beruehrungslosen ermittlung der dicke transparenter werkstoffe und vorrichtung zur durchfuehrung des verfahrens

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280007A (en) * 1975-12-26 1977-07-05 Sony Corp Video disc
NL178915C (nl) * 1976-01-16 1986-06-02 Philips Nv Automatisch optisch focusseersysteem.
JPS52120805A (en) * 1976-04-02 1977-10-11 Sony Corp Servo apparatus
GB1603596A (en) * 1977-06-06 1981-11-25 Mca Disco Vision Optical transducer and focusing system
JPS54133305A (en) * 1978-04-07 1979-10-17 Hitachi Ltd Information recorder
JPS6053943B2 (ja) * 1978-11-30 1985-11-28 キヤノン株式会社 カメラの合焦検出装置
NL7904724A (nl) * 1979-06-18 1980-12-22 Philips Nv Optische aftastinrichting met fokusseerstelsel.
US5172366A (en) * 1988-09-19 1992-12-15 Pioneer Electronic Corporation Optical information reproducing apparatus with selective photodetector output
US20120133957A1 (en) * 2010-11-30 2012-05-31 Widman Michael F Laser confocal sensor metrology system
WO2013119775A1 (en) 2012-02-10 2013-08-15 Johnson & Johnson Vision Care, Inc. Method and apparatus for determining a thickness profile of an ophthalmic lens using a single point thickness and refractive index measurements

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015474A1 (de) * 1979-05-09 1980-11-13 Hitachi Ltd Vorrichtung zum steuern der stellung eines lichtstrahls
DE3147758A1 (de) * 1980-12-02 1982-07-01 Olympus Optical Co., Ltd., Tokyo Vorrichtung zum automatischen scharfeinstellen des objektivs einer fotografischen stehbildkamera, fernsehkamera oder dgl.
DE3913229A1 (de) * 1988-09-19 1990-03-22 Pioneer Electronic Corp Wiedergabegeraet fuer optische informationen
DE3934744A1 (de) * 1989-10-18 1991-04-25 Krupp Gmbh Verfahren zur beruehrungslosen ermittlung der dicke transparenter werkstoffe und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
NL7414695A (nl) 1975-05-13
FR2251021B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1979-06-08
DE2453364A1 (de) 1975-05-28
FR2251021A1 (en) 1975-06-06
DE2453364C3 (de) 1979-02-22

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
8328 Change in the person/name/address of the agent

Free format text: STREHL, P., DIPL.-ING. DIPL.-WIRTSCH.-ING. SCHUEBEL-HOPF, U., DIPL.-CHEM. DR.RER.NAT., PAT.-ANW., 8000 MUENCHEN