JPS5750334A - Optical recorder and reproducer - Google Patents
Optical recorder and reproducerInfo
- Publication number
- JPS5750334A JPS5750334A JP12743680A JP12743680A JPS5750334A JP S5750334 A JPS5750334 A JP S5750334A JP 12743680 A JP12743680 A JP 12743680A JP 12743680 A JP12743680 A JP 12743680A JP S5750334 A JPS5750334 A JP S5750334A
- Authority
- JP
- Japan
- Prior art keywords
- flux
- lens
- prism
- light flux
- error signal
- 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
- 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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To detect focus error signal without lowering the condensing efficiency, by separating the parallel beams given from a collimator lens into a main light flux and a secondary light flux with use of a prism having a specific form. CONSTITUTION:A prism 9 having a trapezoidal section is provided between a collimator lens 7 and an objective lens 2. This prism 9 can be formed also into a conical trapezoid. A light flux 1 made parallel by the lens 7 is separated into a main light flux 10 and a secondary light flux 11 through the prism 9. These light fluxes are irradiated on a disk 3 through the lens 2, and the flux 11 forms an image at a place apart from the flux 10. The reflected beams of these fluxes are made incident to a photodetector 5 via a convex lens 8. Accordingly the flux 11 is received by a 2- split optical detector to obtain a focus error signal. At the same time, the flux 10 is made incident to the lens 2 up to its full aperture to be stopped down to the limit of diffraction on a disk 3. In such way, the focus error signal can be detected without lowering the condensing efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12743680A JPS5750334A (en) | 1980-09-11 | 1980-09-11 | Optical recorder and reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12743680A JPS5750334A (en) | 1980-09-11 | 1980-09-11 | Optical recorder and reproducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5750334A true JPS5750334A (en) | 1982-03-24 |
Family
ID=14959896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12743680A Pending JPS5750334A (en) | 1980-09-11 | 1980-09-11 | Optical recorder and reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5750334A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4836962A (en) * | 1985-06-17 | 1989-06-06 | Katashi Aoki | Material injecting method and material measuring apparatus in injection molding machine |
-
1980
- 1980-09-11 JP JP12743680A patent/JPS5750334A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4836962A (en) * | 1985-06-17 | 1989-06-06 | Katashi Aoki | Material injecting method and material measuring apparatus in injection molding machine |
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