JPS6455754A - Optical head - Google Patents
Optical headInfo
- Publication number
- JPS6455754A JPS6455754A JP62213464A JP21346487A JPS6455754A JP S6455754 A JPS6455754 A JP S6455754A JP 62213464 A JP62213464 A JP 62213464A JP 21346487 A JP21346487 A JP 21346487A JP S6455754 A JPS6455754 A JP S6455754A
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- wavelength
- laser
- objective lens
- executed
- 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
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To drive an objective lens only to a focus control, to simplify and miniaturize a driving mechanism and to attain a high speed access, by varying the light emitting wavelength of a semiconductor laser and controlling the beam width of a laser beam through a beam shaping prism. CONSTITUTION:In accordance with the output of a photodetector 7 of a light emitting wavelength variable means 10, an injecting current is feedback- controlled and the wavelength of the laser beam from a semiconductor laser 1 is desired and controlled. The laser beam becomes a parallel light flux by a collimator lens 2, becomes a laser beam to control one side beam width in accordance with the wavelength with a triangular prism 3 and is outputted through an objective lens 5. Consequently, when the wavelength of the laser beam from the laser 1 is changed, a tracking control is executed, the objective lens is driven only to a focus control, the driving mechanism can be simplified and miniaturized, the oscillation generation at the time of the seek is prevented and the high speed access can be executed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213464A JPH0778901B2 (en) | 1987-08-27 | 1987-08-27 | Optical head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213464A JPH0778901B2 (en) | 1987-08-27 | 1987-08-27 | Optical head |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6455754A true JPS6455754A (en) | 1989-03-02 |
JPH0778901B2 JPH0778901B2 (en) | 1995-08-23 |
Family
ID=16639639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62213464A Expired - Fee Related JPH0778901B2 (en) | 1987-08-27 | 1987-08-27 | Optical head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0778901B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02244432A (en) * | 1989-03-16 | 1990-09-28 | Nec Corp | Optical disk device |
US5202868A (en) * | 1989-05-24 | 1993-04-13 | Kyocera Corporation | Method of displacing a beam converging position and apparatus thereof |
-
1987
- 1987-08-27 JP JP62213464A patent/JPH0778901B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02244432A (en) * | 1989-03-16 | 1990-09-28 | Nec Corp | Optical disk device |
US5202868A (en) * | 1989-05-24 | 1993-04-13 | Kyocera Corporation | Method of displacing a beam converging position and apparatus thereof |
Also Published As
Publication number | Publication date |
---|---|
JPH0778901B2 (en) | 1995-08-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |