JPH0470698B2 - - Google Patents
Info
- Publication number
- JPH0470698B2 JPH0470698B2 JP59242929A JP24292984A JPH0470698B2 JP H0470698 B2 JPH0470698 B2 JP H0470698B2 JP 59242929 A JP59242929 A JP 59242929A JP 24292984 A JP24292984 A JP 24292984A JP H0470698 B2 JPH0470698 B2 JP H0470698B2
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- reference level
- comparator
- disk
- focus position
- 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 - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000001934 delay Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 6
- 239000004926 polymethyl methacrylate Substances 0.000 description 6
- 230000004913 activation Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000000694 effects Effects 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
- G11B7/0945—Methods for initialising servos, start-up sequences
-
- 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
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24292984A JPS61122934A (ja) | 1984-11-16 | 1984-11-16 | 焦点位置制御装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24292984A JPS61122934A (ja) | 1984-11-16 | 1984-11-16 | 焦点位置制御装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61122934A JPS61122934A (ja) | 1986-06-10 |
| JPH0470698B2 true JPH0470698B2 (ko) | 1992-11-11 |
Family
ID=17096312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24292984A Granted JPS61122934A (ja) | 1984-11-16 | 1984-11-16 | 焦点位置制御装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61122934A (ko) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0775076B2 (ja) * | 1986-10-24 | 1995-08-09 | パイオニア株式会社 | フオ−カスサ−ボ引込装置 |
| JPH0664744B2 (ja) * | 1986-11-19 | 1994-08-22 | 松下電送株式会社 | 光デイスク装置のフオ−カスサ−ボ装置 |
| FR2770324B1 (fr) * | 1997-10-29 | 2000-01-28 | Atg Sa | Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique |
| JP2008140442A (ja) * | 2006-11-30 | 2008-06-19 | Toshiba Corp | 光ディスク装置及びフォーカス制御方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5694528A (en) * | 1979-12-28 | 1981-07-31 | Matsushita Electric Ind Co Ltd | Drawing-in method of focus servo |
| JPS57150147A (en) * | 1981-03-10 | 1982-09-16 | Matsushita Electric Ind Co Ltd | Optical type recorder and reproducer |
| JPS58179947A (ja) * | 1982-04-15 | 1983-10-21 | Olympus Optical Co Ltd | 光情報再生装置における合焦検出方式 |
-
1984
- 1984-11-16 JP JP24292984A patent/JPS61122934A/ja active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5694528A (en) * | 1979-12-28 | 1981-07-31 | Matsushita Electric Ind Co Ltd | Drawing-in method of focus servo |
| JPS57150147A (en) * | 1981-03-10 | 1982-09-16 | Matsushita Electric Ind Co Ltd | Optical type recorder and reproducer |
| JPS58179947A (ja) * | 1982-04-15 | 1983-10-21 | Olympus Optical Co Ltd | 光情報再生装置における合焦検出方式 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61122934A (ja) | 1986-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |