JPS6467723A - Pick-up device for optical disk - Google Patents
Pick-up device for optical diskInfo
- Publication number
- JPS6467723A JPS6467723A JP22577387A JP22577387A JPS6467723A JP S6467723 A JPS6467723 A JP S6467723A JP 22577387 A JP22577387 A JP 22577387A JP 22577387 A JP22577387 A JP 22577387A JP S6467723 A JPS6467723 A JP S6467723A
- Authority
- JP
- Japan
- Prior art keywords
- optical disk
- light
- focusing
- goes
- laser
- 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
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To simplify a device and adjustment by also executing focusing detection with a beam for tracking from a semiconductor laser. CONSTITUTION:A laser beam 22, which is outgoing from a laser diode 21, goes to be a parallel light with a collimator lens 23 and transmits a polarizing beam spriter 24 and a 1/4 wavelength board 25. Then, the laser beam 22 goes to be the light of a circularly polarized light from a linearly polarized light and it is condensed by an objective lens 26 and irradiated as a spot light on an optical disk 27. Here, beams 22b and 22c for focusing and tracking control can be utilized also as a beam for focusing control by giving them an angle with diffraction gratings 28a and 28b and projecting them through mirrors 29a and 29b on the optical disk 27. Thus, both the device and the adjustment are simplified.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22577387A JPS6467723A (en) | 1987-09-08 | 1987-09-08 | Pick-up device for optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22577387A JPS6467723A (en) | 1987-09-08 | 1987-09-08 | Pick-up device for optical disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6467723A true JPS6467723A (en) | 1989-03-14 |
Family
ID=16834567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22577387A Pending JPS6467723A (en) | 1987-09-08 | 1987-09-08 | Pick-up device for optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6467723A (en) |
-
1987
- 1987-09-08 JP JP22577387A patent/JPS6467723A/en active Pending
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