JPS5738405A - Method and device for detection of focal point - Google Patents
Method and device for detection of focal pointInfo
- Publication number
- JPS5738405A JPS5738405A JP11446380A JP11446380A JPS5738405A JP S5738405 A JPS5738405 A JP S5738405A JP 11446380 A JP11446380 A JP 11446380A JP 11446380 A JP11446380 A JP 11446380A JP S5738405 A JPS5738405 A JP S5738405A
- Authority
- JP
- Japan
- Prior art keywords
- reflected light
- light
- prism
- reflected
- miniature
- 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
- 238000001514 detection method Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 230000004907 flux Effects 0.000 abstract 1
- 230000003287 optical effect Effects 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)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11446380A JPS5738405A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
| KR1019810003016A KR850000421B1 (ko) | 1980-08-19 | 1981-08-19 | 초점 검출방법 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11446380A JPS5738405A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5738405A true JPS5738405A (en) | 1982-03-03 |
| JPS6343813B2 JPS6343813B2 (enrdf_load_stackoverflow) | 1988-09-01 |
Family
ID=14638361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11446380A Granted JPS5738405A (en) | 1980-08-19 | 1980-08-19 | Method and device for detection of focal point |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5738405A (enrdf_load_stackoverflow) |
| KR (1) | KR850000421B1 (enrdf_load_stackoverflow) |
-
1980
- 1980-08-19 JP JP11446380A patent/JPS5738405A/ja active Granted
-
1981
- 1981-08-19 KR KR1019810003016A patent/KR850000421B1/ko not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6343813B2 (enrdf_load_stackoverflow) | 1988-09-01 |
| KR850000421B1 (ko) | 1985-03-26 |
| KR830006707A (ko) | 1983-10-06 |
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