JPS5738404A - Method and device for detection of focal point - Google Patents
Method and device for detection of focal pointInfo
- Publication number
- JPS5738404A JPS5738404A JP11445880A JP11445880A JPS5738404A JP S5738404 A JPS5738404 A JP S5738404A JP 11445880 A JP11445880 A JP 11445880A JP 11445880 A JP11445880 A JP 11445880A JP S5738404 A JPS5738404 A JP S5738404A
- Authority
- JP
- Japan
- Prior art keywords
- reflected light
- reflected
- light
- detecting
- critical 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.)
- Pending
Links
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
-
- 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)
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445880A JPS5738404A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
| KR1019810003017A KR830006708A (ko) | 1980-08-19 | 1981-08-19 | 초점검출방법 및 장치 |
| KR2019850001878U KR850000649Y1 (ko) | 1980-08-19 | 1985-02-25 | 초점 검출장치 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445880A JPS5738404A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5738404A true JPS5738404A (en) | 1982-03-03 |
Family
ID=14638229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11445880A Pending JPS5738404A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5738404A (ko) |
| KR (1) | KR830006708A (ko) |
-
1980
- 1980-08-19 JP JP11445880A patent/JPS5738404A/ja active Pending
-
1981
- 1981-08-19 KR KR1019810003017A patent/KR830006708A/ko unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR830006708A (ko) | 1983-10-06 |
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