JPS55153136A - Optical reproducing device - Google Patents
Optical reproducing deviceInfo
- Publication number
- JPS55153136A JPS55153136A JP5950879A JP5950879A JPS55153136A JP S55153136 A JPS55153136 A JP S55153136A JP 5950879 A JP5950879 A JP 5950879A JP 5950879 A JP5950879 A JP 5950879A JP S55153136 A JPS55153136 A JP S55153136A
- Authority
- JP
- Japan
- Prior art keywords
- spot
- track
- polarizer
- tracking
- switch
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To make it easy to manufacture devices by dividing light from one light source via a polarizer according to time and then by forming a reading spot at the center of a track and a tracking spot at its side edge part.
CONSTITUTION: A beam from laser 24 is focused on track 7 on a disk by way of lenses 3 and 5. Polarizer 25 at a halfway point of a beam path is applied with the output of selective signal generator 22 via polarization driving circuit 26. With polarizer 25 OFF, a read spot is image-formed in the center of track 7 and with polarizer 25 ON, a tracking spot is image-formed at the side-edge part of track 7. Light beams from both the spots are reflected by half mirror 4 in sequence and supplied as output signals to switch 11 by way of photodetector 9 and amplifier 10. Signal generator 22 sends a tracking spot signal from switch 11 to servo system 38 and a read spot signal to reproduction system 37. Consequently, it is made easy to manufacture devices.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5950879A JPS55153136A (en) | 1979-05-14 | 1979-05-14 | Optical reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5950879A JPS55153136A (en) | 1979-05-14 | 1979-05-14 | Optical reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55153136A true JPS55153136A (en) | 1980-11-28 |
Family
ID=13115261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5950879A Pending JPS55153136A (en) | 1979-05-14 | 1979-05-14 | Optical reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55153136A (en) |
-
1979
- 1979-05-14 JP JP5950879A patent/JPS55153136A/en active Pending
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