JPS5639A - Optical recording and reproducing unit - Google Patents
Optical recording and reproducing unitInfo
- Publication number
- JPS5639A JPS5639A JP7531179A JP7531179A JPS5639A JP S5639 A JPS5639 A JP S5639A JP 7531179 A JP7531179 A JP 7531179A JP 7531179 A JP7531179 A JP 7531179A JP S5639 A JPS5639 A JP S5639A
- Authority
- JP
- Japan
- Prior art keywords
- light
- cylindrical lenses
- spot
- semiconductor laser
- high power
- 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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE: To enable to condense the light beam with high power on the light recording disc surface as fine spot and to always hold the spot on the disc surface, by using two cylindrical lenses.
CONSTITUTION: By coinciding the foci of the concave and convex cylindrical lenses 22, 23, as shown in the point F, the light of the semiconductor laser 11 constituting rectangular light emission form, is converted into almost circular or square parallel light and is led to the objective lens 13. Accordingly, the light beam of high power can be condensed on the surface of the disc 21 as fine spot. Further, since two sets of cylindrical lenses 22, 23 are used to increase the condensing performance of the semiconductor laser, and focus control is made by using the convex lens 24 in the reflection optical path separated from the incident optical path with the beam splitter inserted between the two lenses 22 and 23, enabling to keep constant the distance between the condensing objective lens 13 and the optical recording medium 21.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7531179A JPS5639A (en) | 1979-06-14 | 1979-06-14 | Optical recording and reproducing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7531179A JPS5639A (en) | 1979-06-14 | 1979-06-14 | Optical recording and reproducing unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5639A true JPS5639A (en) | 1981-01-06 |
JPS6161450B2 JPS6161450B2 (en) | 1986-12-25 |
Family
ID=13572573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7531179A Granted JPS5639A (en) | 1979-06-14 | 1979-06-14 | Optical recording and reproducing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5639A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0194536A (en) * | 1987-10-05 | 1989-04-13 | Canon Inc | Optical head device |
JPH01124168U (en) * | 1987-10-26 | 1989-08-23 | ||
JPH0276592A (en) * | 1988-08-10 | 1990-03-15 | Rhone Poulenc Chim | Production of lactic acid |
-
1979
- 1979-06-14 JP JP7531179A patent/JPS5639A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0194536A (en) * | 1987-10-05 | 1989-04-13 | Canon Inc | Optical head device |
JPH01124168U (en) * | 1987-10-26 | 1989-08-23 | ||
JPH0276592A (en) * | 1988-08-10 | 1990-03-15 | Rhone Poulenc Chim | Production of lactic acid |
Also Published As
Publication number | Publication date |
---|---|
JPS6161450B2 (en) | 1986-12-25 |
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