JPS5445156A - Optical system - Google Patents
Optical systemInfo
- Publication number
- JPS5445156A JPS5445156A JP11139977A JP11139977A JPS5445156A JP S5445156 A JPS5445156 A JP S5445156A JP 11139977 A JP11139977 A JP 11139977A JP 11139977 A JP11139977 A JP 11139977A JP S5445156 A JPS5445156 A JP S5445156A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- semiconductor laser
- objective lens
- light
- coupling lens
- 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)
Abstract
PURPOSE: To make possible the formation of a minute circuler spot through the use of a semiconductor laser as a light source by disposing a coupling lens of a low magnification between the light source and an objective lens.
CONSTITUTION: A coupling lens 2 of a magnification below 7 times is disposed between a light source 1 and an objective lens 3. Then, even if a semiconductor laser having light emission regions of different aspect ratios is used as the light source 1, the light distribution entering the objective lens 3 becomes circular owing to the effect of the coupling lens 2 of a low magnification and the spot 4 having been stopped down onto a disc 5 becomes a minute circular shape. Hence, the dot information on the disc 5 may be accurately reproduced while the relatively large light output of the semiconductor laser is being effectively utnilized
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11139977A JPS5445156A (en) | 1977-09-16 | 1977-09-16 | Optical system |
US05/937,982 US4235507A (en) | 1977-09-16 | 1978-08-30 | Optical system to condense light from a semiconductor laser into a circular spot |
CA311,309A CA1109961A (en) | 1977-09-16 | 1978-09-14 | Optical system |
NLAANVRAGE7809382,A NL190494C (en) | 1977-09-16 | 1978-09-14 | Optical device for editing information. |
DE19782840294 DE2840294A1 (en) | 1977-09-16 | 1978-09-15 | OPTICAL SYSTEM |
FR7826599A FR2403575A1 (en) | 1977-09-16 | 1978-09-15 | OPTICAL SYSTEM FOR REPRODUCTION OF INFORMATION |
GB7837018A GB2006461B (en) | 1977-09-16 | 1978-09-15 | Optical system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11139977A JPS5445156A (en) | 1977-09-16 | 1977-09-16 | Optical system |
Related Child Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58089105A Division JPS59123A (en) | 1983-05-23 | 1983-05-23 | Optical system |
JP58089106A Division JPS592242A (en) | 1983-05-23 | 1983-05-23 | Optical information reproducer |
JP58089107A Division JPS59124A (en) | 1983-05-23 | 1983-05-23 | Optical system |
JP58089104A Division JPS592241A (en) | 1983-05-23 | 1983-05-23 | Optical system |
JP58089108A Division JPS59125A (en) | 1983-05-23 | 1983-05-23 | Optical system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5445156A true JPS5445156A (en) | 1979-04-10 |
JPS6211327B2 JPS6211327B2 (en) | 1987-03-12 |
Family
ID=14560157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11139977A Granted JPS5445156A (en) | 1977-09-16 | 1977-09-16 | Optical system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5445156A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5750335A (en) * | 1980-09-09 | 1982-03-24 | Mitsubishi Electric Corp | Optical information reproducer |
JPS59123A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS59125A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS59124A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS592241A (en) * | 1983-05-23 | 1984-01-07 | Hitachi Ltd | Optical system |
JPS5998329A (en) * | 1983-10-28 | 1984-06-06 | Hitachi Ltd | Optical information processing device |
-
1977
- 1977-09-16 JP JP11139977A patent/JPS5445156A/en active Granted
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5750335A (en) * | 1980-09-09 | 1982-03-24 | Mitsubishi Electric Corp | Optical information reproducer |
JPS6256581B2 (en) * | 1980-09-09 | 1987-11-26 | Mitsubishi Electric Corp | |
JPS59123A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS59125A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS59124A (en) * | 1983-05-23 | 1984-01-05 | Hitachi Ltd | Optical system |
JPS592241A (en) * | 1983-05-23 | 1984-01-07 | Hitachi Ltd | Optical system |
JPS5998329A (en) * | 1983-10-28 | 1984-06-06 | Hitachi Ltd | Optical information processing device |
JPS631652B2 (en) * | 1983-10-28 | 1988-01-13 | Hitachi Ltd |
Also Published As
Publication number | Publication date |
---|---|
JPS6211327B2 (en) | 1987-03-12 |
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