JPS5752006A - Method and device for detecting focus - Google Patents
Method and device for detecting focusInfo
- Publication number
- JPS5752006A JPS5752006A JP55114464A JP11446480A JPS5752006A JP S5752006 A JPS5752006 A JP S5752006A JP 55114464 A JP55114464 A JP 55114464A JP 11446480 A JP11446480 A JP 11446480A JP S5752006 A JPS5752006 A JP S5752006A
- Authority
- JP
- Japan
- Prior art keywords
- luminous flux
- reflected
- prism
- quarter
- condensed
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- 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
-
- 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
- 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
- G11B2007/0919—Critical angle methods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55114464A JPS5752006A (en) | 1980-08-19 | 1980-08-19 | Method and device for detecting focus |
US06/292,929 US4422168A (en) | 1980-08-19 | 1981-08-14 | Method and apparatus for detecting a focussing condition of an objective lens |
KR1019810003015A KR830006706A (ko) | 1980-08-19 | 1981-08-19 | 대물렌즈의 집속조건 검출용 장치 및 방법 |
DE3132818A DE3132818C2 (de) | 1980-08-19 | 1981-08-19 | Vorrichtung zum Steuern des Fokussierzustandes eines Objektivs in bezug auf eine Videoplatte |
KR2019850006215U KR850002997Y1 (ko) | 1980-08-19 | 1985-05-25 | 대물렌즈의 집속 조건 검출장치 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55114464A JPS5752006A (en) | 1980-08-19 | 1980-08-19 | Method and device for detecting focus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5752006A true JPS5752006A (en) | 1982-03-27 |
JPS6339979B2 JPS6339979B2 (ja) | 1988-08-09 |
Family
ID=14638387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55114464A Granted JPS5752006A (en) | 1980-08-19 | 1980-08-19 | Method and device for detecting focus |
Country Status (4)
Country | Link |
---|---|
US (1) | US4422168A (ja) |
JP (1) | JPS5752006A (ja) |
KR (1) | KR830006706A (ja) |
DE (1) | DE3132818C2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59231740A (ja) * | 1983-06-14 | 1984-12-26 | Seiko Instr & Electronics Ltd | 対物レンズ装置 |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4504938A (en) * | 1981-04-07 | 1985-03-12 | Victor Company Of Japan, Limited | Device for feedback controlling focus of an optical system in an information recording/reproducing apparatus |
DE3280201D1 (de) * | 1981-07-20 | 1990-08-02 | Toshiba Kawasaki Kk | Optischer kopf. |
DE3280137D1 (de) * | 1981-09-17 | 1990-04-19 | Toshiba Kawasaki Kk | Ein optischer kopf. |
US4626679A (en) * | 1982-09-22 | 1986-12-02 | Canon Kabushiki Kaisha | Optical head and method of detecting the focus thereof |
JPS5990007A (ja) * | 1982-11-16 | 1984-05-24 | Olympus Optical Co Ltd | 光学式寸度測定装置 |
US4656348A (en) * | 1983-04-12 | 1987-04-07 | Kabushiki Kaisha Toshiba | Optical head |
JPH0782655B2 (ja) * | 1983-04-28 | 1995-09-06 | オリンパス光学工業株式会社 | 光ヘッド |
JPS60197950A (ja) * | 1984-03-22 | 1985-10-07 | Toshiba Corp | 光学ヘツド |
US5416755A (en) * | 1985-02-28 | 1995-05-16 | Canon Kabushiki Kaisha | Optical pickup using split beams impinging on different photo-detector areas |
US4742218A (en) * | 1985-03-11 | 1988-05-03 | Hitachi, Ltd. | Focus error detection apparatus utilizing focusing an front and rear sides of focal planes |
WO1987002499A1 (en) * | 1985-10-10 | 1987-04-23 | Opticon Technology Incorporated | Apparatus for recording and reading optical data marks on an optical medium |
WO1987005142A1 (en) * | 1986-02-24 | 1987-08-27 | Sony Corporation | Device for detecting focus |
EP0253613B1 (en) * | 1986-07-14 | 1991-11-21 | Sharp Kabushiki Kaisha | Optical head |
DE3730555A1 (de) * | 1986-09-12 | 1988-03-24 | Olympus Optical Co | Optische informations-aufzeichnungs/wiedergabe-einrichtung |
JPS63163313A (ja) * | 1986-12-25 | 1988-07-06 | Mitaka Koki Kk | 非接触自動焦点位置合わせ装置 |
JP2596545B2 (ja) * | 1987-01-07 | 1997-04-02 | パイオニア株式会社 | 焦点誤差検出装置及びこれに用いられる光検出器の受光領域幅の選定方法 |
JPS63257925A (ja) * | 1987-04-15 | 1988-10-25 | Nippon Coinco:Kk | 光ヘツドの焦点制御信号検出装置 |
US5060212A (en) * | 1987-08-17 | 1991-10-22 | Ricoh Company, Ltd. | Integrated optical pick-up device |
JP2904422B2 (ja) * | 1989-07-19 | 1999-06-14 | パイオニア株式会社 | 光ヘッド |
US4998011A (en) * | 1989-11-17 | 1991-03-05 | Applied Magnetics Corporation | Flat plate focus sensing apparatus |
US5101393A (en) * | 1990-07-25 | 1992-03-31 | Hewlett-Packard Company | Optical position error detection using complementary steep angle reflections/transmissions |
US5245174A (en) * | 1990-10-15 | 1993-09-14 | Applied Magnetics Corporation | Focus sensing apparatus utilizing a reflecting surface having variable reflectivity |
GB2248989B (en) * | 1990-10-15 | 1995-05-24 | Applied Magnetics Corp | Focus sensing apparatus and method |
US5657164A (en) * | 1991-05-28 | 1997-08-12 | Discovision Associates | Optical beamsplitter |
US5331622A (en) * | 1991-05-28 | 1994-07-19 | Applied Magnetics Corporation | Compact optical head |
JPH07199052A (ja) * | 1993-12-28 | 1995-08-04 | Olympus Optical Co Ltd | 焦点検出方法および距離測定方法 |
US6167006A (en) | 1995-03-31 | 2000-12-26 | Kabushiki Kaisha Toshiba | Optical information recording/reproducing apparatus based on tracking control of irradiated light |
KR100374451B1 (ko) * | 1995-10-27 | 2003-05-09 | 마쯔시다덴기산교 가부시키가이샤 | 광헤드 |
EP0951014A3 (en) * | 1998-04-14 | 2000-02-23 | Deutsche Thomson-Brandt Gmbh | Device for reading from or writting to optical recording media |
US20090245068A1 (en) * | 2008-03-31 | 2009-10-01 | Panasonic Corporation | Optical pickup device and optical disc drive |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7703077A (nl) * | 1977-03-22 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
JPS5821334B2 (ja) * | 1978-12-25 | 1983-04-28 | 株式会社東芝 | 自動焦点調節装置 |
GB2057218B (en) * | 1979-06-25 | 1984-02-29 | Olympus Optical Co | Detecting focussing error |
NL7907216A (nl) * | 1979-09-28 | 1981-03-31 | Philips Nv | Optisch fokusfout-detektiestelsel. |
US4357533A (en) * | 1980-07-14 | 1982-11-02 | Discovision Associates | Focus detector for an optical disc playback system |
-
1980
- 1980-08-19 JP JP55114464A patent/JPS5752006A/ja active Granted
-
1981
- 1981-08-14 US US06/292,929 patent/US4422168A/en not_active Expired - Lifetime
- 1981-08-19 KR KR1019810003015A patent/KR830006706A/ko unknown
- 1981-08-19 DE DE3132818A patent/DE3132818C2/de not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59231740A (ja) * | 1983-06-14 | 1984-12-26 | Seiko Instr & Electronics Ltd | 対物レンズ装置 |
Also Published As
Publication number | Publication date |
---|---|
US4422168A (en) | 1983-12-20 |
DE3132818A1 (de) | 1982-04-29 |
JPS6339979B2 (ja) | 1988-08-09 |
DE3132818C2 (de) | 1986-10-09 |
KR830006706A (ko) | 1983-10-06 |
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