JPS5570942A - Tracking error detector - Google Patents
Tracking error detectorInfo
- Publication number
- JPS5570942A JPS5570942A JP14238878A JP14238878A JPS5570942A JP S5570942 A JPS5570942 A JP S5570942A JP 14238878 A JP14238878 A JP 14238878A JP 14238878 A JP14238878 A JP 14238878A JP S5570942 A JPS5570942 A JP S5570942A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- tracking error
- semiconductor laser
- spot
- 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 Recording Or Reproduction (AREA)
Abstract
PURPOSE:To obtain the tracking error information, by locating the spot image of point light source to track direction and combining the condition change information with self coupling effect of semiconductor laser, in the optical system disc player. CONSTITUTION:The light from the semiconductor laser light source 2 is reflected on the video disc surface 4 via the lenses 3, 3', the light including the recording information returns to the light source 2, and the light including the self coupling effect of the light source 2 is incident to the information reading photo detector 1. In this case, when the light spot 5 from the light source 2 is located on the track, the light sources 2a, 2b are located so that the light spots 5a, 5b from the semiconductor laser light sources 2a, 2b are positioned by clipping the track and the light emitting plane of each light source is on the plane almost orthogonal to the light axis. Accordingly, the light output from the light sources 2a and 2b is changed on the position change of the spot 5, and the tracking error signal can be obtained with the operation 8 of the output of the photo detectors 1a and 1b corresponded.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14238878A JPS5570942A (en) | 1978-11-20 | 1978-11-20 | Tracking error detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14238878A JPS5570942A (en) | 1978-11-20 | 1978-11-20 | Tracking error detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5570942A true JPS5570942A (en) | 1980-05-28 |
JPS6136296B2 JPS6136296B2 (en) | 1986-08-18 |
Family
ID=15314195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14238878A Granted JPS5570942A (en) | 1978-11-20 | 1978-11-20 | Tracking error detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5570942A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4759007A (en) * | 1981-12-10 | 1988-07-19 | Discovision Associates | Storage medium track pitch detector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6445859A (en) * | 1987-08-10 | 1989-02-20 | Hirano Kinzoku Co Ltd | Tenter type hot air treatment apparatus |
-
1978
- 1978-11-20 JP JP14238878A patent/JPS5570942A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4759007A (en) * | 1981-12-10 | 1988-07-19 | Discovision Associates | Storage medium track pitch detector |
Also Published As
Publication number | Publication date |
---|---|
JPS6136296B2 (en) | 1986-08-18 |
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