JPH0150975B2 - - Google Patents
Info
- Publication number
- JPH0150975B2 JPH0150975B2 JP6528881A JP6528881A JPH0150975B2 JP H0150975 B2 JPH0150975 B2 JP H0150975B2 JP 6528881 A JP6528881 A JP 6528881A JP 6528881 A JP6528881 A JP 6528881A JP H0150975 B2 JPH0150975 B2 JP H0150975B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- thin film
- prism
- reflected
- incident
- 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 52
- 239000010409 thin film Substances 0.000 claims description 37
- 230000008859 change Effects 0.000 claims description 19
- 239000010408 film Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 description 17
- 239000010410 layer Substances 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/14—Mountings, adjusting means, or light-tight connections, for optical elements for lenses adapted to interchange lenses
- G02B7/16—Rotatable turrets
-
- 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
-
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
-
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
- G11B2007/0919—Critical angle methods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6528881A JPS57181504A (en) | 1981-05-01 | 1981-05-01 | Detection of focus |
| US06/339,718 US4505584A (en) | 1981-01-22 | 1982-01-15 | Method and apparatus for detecting focussing error signal of objective lens |
| NLAANVRAGE8200220,A NL184245C (nl) | 1981-01-22 | 1982-01-21 | Inrichting voor het verkrijgen van een focusseringsfoutsignaal van een objectieflens met betrekking tot een voorwerp waarop door de objectieflens een lichtbundel moet worden gefocusseerd. |
| FR8200918A FR2498340A1 (fr) | 1981-01-22 | 1982-01-21 | Procede et appareil de detection d'un signal d'erreur de focalisation d'un objectif |
| KR8200249A KR850001924B1 (en) | 1981-01-22 | 1982-01-21 | The method and apparatus for detecting a focussing error signal of objective lens |
| GB08201844A GB2110499B (en) | 1981-01-22 | 1982-01-22 | Method and apparatus for detecting focussing error signal of objective lens |
| DE3201964A DE3201964C2 (de) | 1981-01-22 | 1982-01-22 | Vorrichtung zum Scharfstellen eines Objektivs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6528881A JPS57181504A (en) | 1981-05-01 | 1981-05-01 | Detection of focus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57181504A JPS57181504A (en) | 1982-11-09 |
| JPH0150975B2 true JPH0150975B2 (enExample) | 1989-11-01 |
Family
ID=13282592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6528881A Granted JPS57181504A (en) | 1981-01-22 | 1981-05-01 | Detection of focus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57181504A (enExample) |
-
1981
- 1981-05-01 JP JP6528881A patent/JPS57181504A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57181504A (en) | 1982-11-09 |
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