JPH0548531B2 - - Google Patents
Info
- Publication number
- JPH0548531B2 JPH0548531B2 JP23975184A JP23975184A JPH0548531B2 JP H0548531 B2 JPH0548531 B2 JP H0548531B2 JP 23975184 A JP23975184 A JP 23975184A JP 23975184 A JP23975184 A JP 23975184A JP H0548531 B2 JPH0548531 B2 JP H0548531B2
- Authority
- JP
- Japan
- Prior art keywords
- lead compensation
- phase lead
- circuit
- compensation circuit
- output
- 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
- 238000001514 detection method Methods 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims 3
- 230000005855 radiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003746 surface roughness 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
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 |
|---|---|---|---|
| JP23975184A JPS61117736A (ja) | 1984-11-13 | 1984-11-13 | 自動焦点制御装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23975184A JPS61117736A (ja) | 1984-11-13 | 1984-11-13 | 自動焦点制御装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61117736A JPS61117736A (ja) | 1986-06-05 |
| JPH0548531B2 true JPH0548531B2 (en, 2012) | 1993-07-21 |
Family
ID=17049382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23975184A Granted JPS61117736A (ja) | 1984-11-13 | 1984-11-13 | 自動焦点制御装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61117736A (en, 2012) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63177322A (ja) * | 1986-12-27 | 1988-07-21 | Alpine Electron Inc | フオ−カスサ−ボ回路 |
-
1984
- 1984-11-13 JP JP23975184A patent/JPS61117736A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61117736A (ja) | 1986-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |