CA1195424A - Control circuitry for preliminary focusing of light on a record medium surface in an optical reproducing apparatus - Google Patents
Control circuitry for preliminary focusing of light on a record medium surface in an optical reproducing apparatusInfo
- Publication number
- CA1195424A CA1195424A CA000418765A CA418765A CA1195424A CA 1195424 A CA1195424 A CA 1195424A CA 000418765 A CA000418765 A CA 000418765A CA 418765 A CA418765 A CA 418765A CA 1195424 A CA1195424 A CA 1195424A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- focus
- reproducing apparatus
- level
- optical reproducing
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001481828 Glyptocephalus cynoglossus Species 0.000 description 1
- 101100521130 Mus musculus Prelid1 gene Proteins 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000011073 invertase Nutrition 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
-
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57002146A JPS58121137A (ja) | 1982-01-09 | 1982-01-09 | 光学式デイスク再生装置のフオ−カス引込み回路 |
| JP2146/82 | 1982-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1195424A true CA1195424A (en) | 1985-10-15 |
Family
ID=11521204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000418765A Expired CA1195424A (en) | 1982-01-09 | 1982-12-30 | Control circuitry for preliminary focusing of light on a record medium surface in an optical reproducing apparatus |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4512003A (en, 2012) |
| JP (1) | JPS58121137A (en, 2012) |
| KR (1) | KR910005640B1 (en, 2012) |
| CA (1) | CA1195424A (en, 2012) |
| DE (1) | DE3300554A1 (en, 2012) |
| FR (1) | FR2522859B1 (en, 2012) |
| GB (1) | GB2115579B (en, 2012) |
| NL (1) | NL192146C (en, 2012) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3380426D1 (en) * | 1982-06-04 | 1989-09-21 | Sony Corp | Optical disc reproducer |
| JPS5928828U (ja) * | 1982-08-17 | 1984-02-22 | パイオニア株式会社 | 情報検出用スポツト光の集束位置移動制御装置 |
| JPS6089840A (ja) * | 1983-10-22 | 1985-05-20 | Olympus Optical Co Ltd | 自動焦点引込み装置 |
| JPS6134734A (ja) * | 1984-07-25 | 1986-02-19 | Sony Corp | 光学式デイスクプレ−ヤ |
| DE3508525A1 (de) * | 1985-03-09 | 1986-09-11 | Thomson Brandt Gmbh | Fokus-such-einrichtung fuer beruehrungslose abtastung |
| US4700056A (en) * | 1985-11-13 | 1987-10-13 | Optotech, Inc. | Objective lens focus initialization system |
| JPH0695425B2 (ja) * | 1987-04-15 | 1994-11-24 | パイオニア株式会社 | デイスク検出方式 |
| US4998233A (en) * | 1988-02-12 | 1991-03-05 | International Business Machines Corporation | Acquiring focus in optical systems using a focus error signal and a laser drive signal |
| US5101392A (en) * | 1988-11-21 | 1992-03-31 | Kabushiki Kaisha Toshiba | Information recording apparatus |
| US5020045A (en) * | 1988-12-19 | 1991-05-28 | Eastman Kodak Company | Focus acquisition servo system and associated method |
| JPH0719381B2 (ja) * | 1989-10-04 | 1995-03-06 | 松下電器産業株式会社 | フォーカス引き込み方式 |
| DE69320997T2 (de) * | 1992-08-04 | 1999-03-11 | Sony Corp., Tokio/Tokyo | Wiedergabegerät |
| US5629912A (en) * | 1995-01-30 | 1997-05-13 | Sony Corporation | Focusing servo controlling apparatus |
| WO2006021931A1 (en) * | 2004-08-27 | 2006-03-02 | Koninklijke Philips Electronics N.V. | System for scribing a visible label |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2330062A1 (fr) * | 1975-10-31 | 1977-05-27 | Thomson Brandt | Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif |
| SE7813460L (sv) * | 1978-03-27 | 1979-09-28 | Mca Disco Vision | Videoskivspelare |
| JPS54164522U (en, 2012) * | 1978-05-11 | 1979-11-17 | ||
| JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
| JPS5694528A (en) * | 1979-12-28 | 1981-07-31 | Matsushita Electric Ind Co Ltd | Drawing-in method of focus servo |
| US4446546A (en) * | 1981-12-31 | 1984-05-01 | Magnetic Peripherals Inc. | Focus initialization system for optical recording |
-
1982
- 1982-01-09 JP JP57002146A patent/JPS58121137A/ja active Granted
- 1982-12-29 US US06/454,330 patent/US4512003A/en not_active Expired - Lifetime
- 1982-12-30 CA CA000418765A patent/CA1195424A/en not_active Expired
- 1982-12-30 FR FR8222152A patent/FR2522859B1/fr not_active Expired
-
1983
- 1983-01-04 NL NL8300016A patent/NL192146C/nl not_active IP Right Cessation
- 1983-01-06 KR KR1019830000032A patent/KR910005640B1/ko not_active Expired
- 1983-01-10 GB GB08300509A patent/GB2115579B/en not_active Expired
- 1983-01-10 DE DE19833300554 patent/DE3300554A1/de active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB8300509D0 (en) | 1983-02-09 |
| US4512003A (en) | 1985-04-16 |
| FR2522859B1 (fr) | 1986-05-09 |
| JPS58121137A (ja) | 1983-07-19 |
| DE3300554C2 (en, 2012) | 1993-05-27 |
| GB2115579A (en) | 1983-09-07 |
| NL8300016A (nl) | 1983-08-01 |
| JPH0410129B2 (en, 2012) | 1992-02-24 |
| KR910005640B1 (ko) | 1991-08-01 |
| KR840003510A (ko) | 1984-09-08 |
| NL192146C (nl) | 1997-02-04 |
| NL192146B (nl) | 1996-10-01 |
| GB2115579B (en) | 1985-06-05 |
| FR2522859A1 (fr) | 1983-09-09 |
| DE3300554A1 (de) | 1983-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |