JPS649656B2 - - Google Patents
Info
- Publication number
- JPS649656B2 JPS649656B2 JP11934583A JP11934583A JPS649656B2 JP S649656 B2 JPS649656 B2 JP S649656B2 JP 11934583 A JP11934583 A JP 11934583A JP 11934583 A JP11934583 A JP 11934583A JP S649656 B2 JPS649656 B2 JP S649656B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- photodetector
- focal position
- aperture
- receiving surface
- 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
- 238000001514 detection method Methods 0.000 claims description 30
- 230000003287 optical effect Effects 0.000 claims description 27
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000007740 vapor deposition 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
- 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
- G11B7/0912—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 by push-pull method
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11934583A JPS6010423A (ja) | 1983-06-30 | 1983-06-30 | 焦点位置誤差検出装置 |
| US06/625,609 US4705941A (en) | 1983-06-30 | 1984-06-28 | Apparatus for detecting a focusing state of an optical system |
| DE8484304501T DE3479935D1 (en) | 1983-06-30 | 1984-06-29 | Apparatus for detecting a focusing state of an optical system |
| EP84304501A EP0130831B1 (en) | 1983-06-30 | 1984-06-29 | Apparatus for detecting a focusing state of an optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11934583A JPS6010423A (ja) | 1983-06-30 | 1983-06-30 | 焦点位置誤差検出装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6010423A JPS6010423A (ja) | 1985-01-19 |
| JPS649656B2 true JPS649656B2 (en, 2012) | 1989-02-20 |
Family
ID=14759183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11934583A Granted JPS6010423A (ja) | 1983-06-30 | 1983-06-30 | 焦点位置誤差検出装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6010423A (en, 2012) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10639453B2 (en) | 2016-08-19 | 2020-05-05 | Sarah L. Olson | External catheter stabilizer |
| US11364366B2 (en) | 2018-12-21 | 2022-06-21 | Levity Products, Inc. | External catheter stabilizer |
-
1983
- 1983-06-30 JP JP11934583A patent/JPS6010423A/ja active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10639453B2 (en) | 2016-08-19 | 2020-05-05 | Sarah L. Olson | External catheter stabilizer |
| US11364366B2 (en) | 2018-12-21 | 2022-06-21 | Levity Products, Inc. | External catheter stabilizer |
| US12370347B2 (en) | 2018-12-21 | 2025-07-29 | Levity Products, Inc. | External catheter stabilizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6010423A (ja) | 1985-01-19 |
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