JPS5443756A - Optically recording and reproducing apparatus - Google Patents
Optically recording and reproducing apparatusInfo
- Publication number
- JPS5443756A JPS5443756A JP11073577A JP11073577A JPS5443756A JP S5443756 A JPS5443756 A JP S5443756A JP 11073577 A JP11073577 A JP 11073577A JP 11073577 A JP11073577 A JP 11073577A JP S5443756 A JPS5443756 A JP S5443756A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- disc
- light beam
- irradiated
- irradiate
- 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 simplify the optical conditions, to reduce the size of the apparatus and to generate stable reproduction signals having a high S/N ratio by using two light sources, which are suitable for recording and reproducing purposes, respectively, so that the iris positions of the respective beams may be adjusted by a focus controlling detector.
CONSTITUTION: A light beam a, which is produced by modulating the recording signals from a terminal A by a drive circuit 1, is generated from a semiconductor laser 2 so that it may be introduced through a condensing lens 3 and a tracking mirror 4 into the center of an iris lens 5. The light beam thus introduced is irised out the most at a point P into a fine spot, which is irradiated upon a disc 6 to record the information. The light beam 6 from a He-Ne laser 10 is enlarged by a projecting lens 11 so that it may be irradiated upon the disc 6 from the position out of the center of the lens 5. The splitter 12 changes the optical path of the reflected light c from the disc 6 to irradiate optical detectors 14 and 15. The output difference between the detectors 14 and 15 is fed to a lens drive device 13 so that the lens 5 may be moved up and down, even if the disc is vibrated by the rotations, so as to irradiate the fine spot P upon the disc.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52110735A JPS5942376B2 (en) | 1977-09-13 | 1977-09-13 | optical recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52110735A JPS5942376B2 (en) | 1977-09-13 | 1977-09-13 | optical recording and reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5443756A true JPS5443756A (en) | 1979-04-06 |
JPS5942376B2 JPS5942376B2 (en) | 1984-10-15 |
Family
ID=14543180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52110735A Expired JPS5942376B2 (en) | 1977-09-13 | 1977-09-13 | optical recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5942376B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6433736A (en) * | 1988-07-15 | 1989-02-03 | Sony Corp | Device for reproducing optical record |
-
1977
- 1977-09-13 JP JP52110735A patent/JPS5942376B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6433736A (en) * | 1988-07-15 | 1989-02-03 | Sony Corp | Device for reproducing optical record |
Also Published As
Publication number | Publication date |
---|---|
JPS5942376B2 (en) | 1984-10-15 |
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