JPS5749908A - Method and device for detecting focus - Google Patents
Method and device for detecting focusInfo
- Publication number
- JPS5749908A JPS5749908A JP55125252A JP12525280A JPS5749908A JP S5749908 A JPS5749908 A JP S5749908A JP 55125252 A JP55125252 A JP 55125252A JP 12525280 A JP12525280 A JP 12525280A JP S5749908 A JPS5749908 A JP S5749908A
- Authority
- JP
- Japan
- Prior art keywords
- reflecting surface
- photodetector
- constitution
- reflected light
- angle
- 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 abstract 3
- 230000007423 decrease Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
- G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
-
- 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
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55125252A JPS5749908A (en) | 1980-09-11 | 1980-09-11 | Method and device for detecting focus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55125252A JPS5749908A (en) | 1980-09-11 | 1980-09-11 | Method and device for detecting focus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5749908A true JPS5749908A (en) | 1982-03-24 |
| JPS647407B2 JPS647407B2 (enrdf_load_stackoverflow) | 1989-02-08 |
Family
ID=14905509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55125252A Granted JPS5749908A (en) | 1980-09-11 | 1980-09-11 | Method and device for detecting focus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5749908A (enrdf_load_stackoverflow) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6390860B2 (en) | 1997-04-18 | 2002-05-21 | Yazaki Corporation | Connector with a terminal deflection preventing mechanism |
| US9281596B2 (en) | 2013-08-26 | 2016-03-08 | Dai-Ichi Seiko Co., Ltd. | Connector terminal and method of fabricating the same |
-
1980
- 1980-09-11 JP JP55125252A patent/JPS5749908A/ja active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6390860B2 (en) | 1997-04-18 | 2002-05-21 | Yazaki Corporation | Connector with a terminal deflection preventing mechanism |
| US9281596B2 (en) | 2013-08-26 | 2016-03-08 | Dai-Ichi Seiko Co., Ltd. | Connector terminal and method of fabricating the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS647407B2 (enrdf_load_stackoverflow) | 1989-02-08 |
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