JPS639306B2 - - Google Patents
Info
- Publication number
- JPS639306B2 JPS639306B2 JP55114453A JP11445380A JPS639306B2 JP S639306 B2 JPS639306 B2 JP S639306B2 JP 55114453 A JP55114453 A JP 55114453A JP 11445380 A JP11445380 A JP 11445380A JP S639306 B2 JPS639306 B2 JP S639306B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflected
- incident
- disk
- rays
- 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 65
- 230000003287 optical effect Effects 0.000 description 34
- 238000010586 diagram Methods 0.000 description 14
- 230000004907 flux Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000002834 transmittance 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
-
- 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
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 |
|---|---|---|---|
| JP11445380A JPS5738403A (en) | 1980-08-19 | 1980-08-19 | Focal point detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11445380A JPS5738403A (en) | 1980-08-19 | 1980-08-19 | Focal point detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5738403A JPS5738403A (en) | 1982-03-03 |
| JPS639306B2 true JPS639306B2 (nl) | 1988-02-26 |
Family
ID=14638104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11445380A Granted JPS5738403A (en) | 1980-08-19 | 1980-08-19 | Focal point detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5738403A (nl) |
-
1980
- 1980-08-19 JP JP11445380A patent/JPS5738403A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5738403A (en) | 1982-03-03 |
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