JPS5698728A - Optical reader - Google Patents
Optical readerInfo
- Publication number
- JPS5698728A JPS5698728A JP113580A JP113580A JPS5698728A JP S5698728 A JPS5698728 A JP S5698728A JP 113580 A JP113580 A JP 113580A JP 113580 A JP113580 A JP 113580A JP S5698728 A JPS5698728 A JP S5698728A
- Authority
- JP
- Japan
- Prior art keywords
- rotated
- signal
- incident light
- reflected
- photodetector
- 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
Abstract
PURPOSE: To read information without any error, by comparing a signal rotated in the positive direction to incident light with a signal rotated in the negative direction by an optical reader which reads information by utilizing the rotation of linear polarization.
CONSTITUTION: Linearly polarized light is reflected by recording medium 1 and the plane of polarization is rotated by kerr rotation θk. The reflected light is further reflected by mirror 2 and then divided into two by beam splitter 3. Then, it is passed through detector 4 rotated by +θk from an extinction position to the incident light and detected by photodetector 5, and it is also passed through detector 8 rotated by -θk from the extinction position to the incident light and then detected by photodetector 9. In addition, when no information signal is recorded, reference values are stored in memories 6 and 10 and only when photodetectors 5 and 9 generate positive and negative signals, a read signal is generated by pulse signal generator 113.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP113580A JPS5698728A (en) | 1980-01-08 | 1980-01-08 | Optical reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP113580A JPS5698728A (en) | 1980-01-08 | 1980-01-08 | Optical reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5698728A true JPS5698728A (en) | 1981-08-08 |
Family
ID=11492994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP113580A Pending JPS5698728A (en) | 1980-01-08 | 1980-01-08 | Optical reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5698728A (en) |
-
1980
- 1980-01-08 JP JP113580A patent/JPS5698728A/en active Pending
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