JPS6484450A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPS6484450A JPS6484450A JP62242941A JP24294187A JPS6484450A JP S6484450 A JPS6484450 A JP S6484450A JP 62242941 A JP62242941 A JP 62242941A JP 24294187 A JP24294187 A JP 24294187A JP S6484450 A JPS6484450 A JP S6484450A
- Authority
- JP
- Japan
- Prior art keywords
- light
- changed
- circular
- elliptical
- light source
- 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
Abstract
PURPOSE:To simplify the optical system of a phase change type optical disk by providing a cylindrical lens to change a circular beam into an elliptical beam, detachably in the optical path of a laser beam. CONSTITUTION:At the time of information recording, after laser light 16 from the light source 15 of a semiconductor laser is changed into parallel light by a fourth lens 17, it is shape-corrected by two prisms 18,18', and is changed into the circular beam. Next, at the time of erasure, the cylindrical lens 22 is inserted previously between a 1/4 wavelength plate 20 and a mirror 21, and after the light emitted from the light source 15 is changed into the circular beam, it is changed into an elliptically polarized beam by letting it pass through the cylindrical lens 22, and is converged by an objective lens 7, and the elliptical light is irradiated to a recording layer 8. By this constitution, the circular light and the elliptical light can be irradiated by using one light source 15, and the optical system can be simplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62242941A JPS6484450A (en) | 1987-09-28 | 1987-09-28 | Optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62242941A JPS6484450A (en) | 1987-09-28 | 1987-09-28 | Optical disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6484450A true JPS6484450A (en) | 1989-03-29 |
Family
ID=17096498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62242941A Pending JPS6484450A (en) | 1987-09-28 | 1987-09-28 | Optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6484450A (en) |
-
1987
- 1987-09-28 JP JP62242941A patent/JPS6484450A/en active Pending
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