JPS6488696A - Method and device for reading optical recording - Google Patents
Method and device for reading optical recordingInfo
- Publication number
- JPS6488696A JPS6488696A JP62244732A JP24473287A JPS6488696A JP S6488696 A JPS6488696 A JP S6488696A JP 62244732 A JP62244732 A JP 62244732A JP 24473287 A JP24473287 A JP 24473287A JP S6488696 A JPS6488696 A JP S6488696A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reading
- lambda2
- lambda1
- signal
- 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 discriminate whether the change of the reflectance and the transmissivity of reading light depends on a recording signal or not by irradiating more than two wave lengths or white light on an optical recording member as the reading light and taking the ratio of the light intensity more than two wavelengths of the reflected light or the transmitted light as a reading signal. CONSTITUTION:The reading lights lambda1, lambda2 emitted from light source parts 1, 2 are synthesized by mirrors 3, 4 and transmitted through the recording signal part 7 of the recording member 6 as 1 synthesized reading light 5. The transmitted light is divided into wavelength components lambda1, lambda2 by a spectral element 10 and respectively reach detectors 11, 12. The output of the detector enters a computing element 14 and is outputted as a wavelength intensity ratio lambda1/lambda2. Herein, the two light sources 1, 2 are used and the same effect may be obtained by using a single white light source. Thereby, the signal and a stain can be discriminated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62244732A JPS6488696A (en) | 1987-09-29 | 1987-09-29 | Method and device for reading optical recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62244732A JPS6488696A (en) | 1987-09-29 | 1987-09-29 | Method and device for reading optical recording |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488696A true JPS6488696A (en) | 1989-04-03 |
Family
ID=17123069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62244732A Pending JPS6488696A (en) | 1987-09-29 | 1987-09-29 | Method and device for reading optical recording |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488696A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03216779A (en) * | 1990-01-22 | 1991-09-24 | Toppan Printing Co Ltd | Method and device for reading mark |
US5179422A (en) * | 1991-05-15 | 1993-01-12 | Environmental Research Institute Of Michigan | Contamination detection system |
-
1987
- 1987-09-29 JP JP62244732A patent/JPS6488696A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03216779A (en) * | 1990-01-22 | 1991-09-24 | Toppan Printing Co Ltd | Method and device for reading mark |
US5179422A (en) * | 1991-05-15 | 1993-01-12 | Environmental Research Institute Of Michigan | Contamination detection system |
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