JPS61139938A - フオ−カス制御装置 - Google Patents
フオ−カス制御装置Info
- Publication number
- JPS61139938A JPS61139938A JP26248084A JP26248084A JPS61139938A JP S61139938 A JPS61139938 A JP S61139938A JP 26248084 A JP26248084 A JP 26248084A JP 26248084 A JP26248084 A JP 26248084A JP S61139938 A JPS61139938 A JP S61139938A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflected light
- optical axis
- focus control
- optical means
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000012780 transparent material Substances 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
- G11B7/0908—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)
- Optical Recording Or Reproduction (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26248084A JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26248084A JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61139938A true JPS61139938A (ja) | 1986-06-27 |
| JPH0430647B2 JPH0430647B2 (enrdf_load_stackoverflow) | 1992-05-22 |
Family
ID=17376368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26248084A Granted JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61139938A (enrdf_load_stackoverflow) |
-
1984
- 1984-12-12 JP JP26248084A patent/JPS61139938A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0430647B2 (enrdf_load_stackoverflow) | 1992-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |