JPS5584909A - Information reading system by laser beam - Google Patents
Information reading system by laser beamInfo
- Publication number
- JPS5584909A JPS5584909A JP15902778A JP15902778A JPS5584909A JP S5584909 A JPS5584909 A JP S5584909A JP 15902778 A JP15902778 A JP 15902778A JP 15902778 A JP15902778 A JP 15902778A JP S5584909 A JPS5584909 A JP S5584909A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- spot
- reading system
- information reading
- original
- 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 subtract two output signals and perform two-dimensional edge emphasis processing of the information having been read by increasing the beam diameter of one of two laser beams of different wavelengths and superposing both to form a spot.
CONSTITUTION: The magnifications of the beam expander BE1 and BE2 are so set that the spot diameter emitted from a laser 10 becomes smaller than the spot diameter emitted from a laser 11. The both beams are synthesized in a half mirror 12 to form a scanning spot P on the original G. The reflected light from the original is detected with photo detectors 15, 16 and both signals are subtracted by a subtractor 21, whereby the edge-emphasized signal S2 is obtained. This yields such an information reading system which is so arranged as to have two-dimensional edge emphasis processing done by subtracting the output signals of the two photo detectors read with the two laser beams of different wavelengths.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15902778A JPS5584909A (en) | 1978-12-20 | 1978-12-20 | Information reading system by laser beam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15902778A JPS5584909A (en) | 1978-12-20 | 1978-12-20 | Information reading system by laser beam |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5584909A true JPS5584909A (en) | 1980-06-26 |
Family
ID=15684648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15902778A Pending JPS5584909A (en) | 1978-12-20 | 1978-12-20 | Information reading system by laser beam |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5584909A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5093822A (en) * | 1989-06-07 | 1992-03-03 | Hitachi, Ltd. | High-density magnetic recording and optical reproducing apparatus |
WO1997021214A1 (en) * | 1995-12-04 | 1997-06-12 | Yves Bernard Andre | Device for optically reading digital data from a medium, particularly a laser disk reader device |
WO1998022943A1 (en) * | 1996-11-15 | 1998-05-28 | Verity Group Plc | Optical disc reader |
-
1978
- 1978-12-20 JP JP15902778A patent/JPS5584909A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5093822A (en) * | 1989-06-07 | 1992-03-03 | Hitachi, Ltd. | High-density magnetic recording and optical reproducing apparatus |
WO1997021214A1 (en) * | 1995-12-04 | 1997-06-12 | Yves Bernard Andre | Device for optically reading digital data from a medium, particularly a laser disk reader device |
US6151291A (en) * | 1995-12-04 | 2000-11-21 | Andre; Yves Bernard | Device for optically reading digital data from a medium, particularly a laser disk reader device |
WO1998022943A1 (en) * | 1996-11-15 | 1998-05-28 | Verity Group Plc | Optical disc reader |
GB2334811A (en) * | 1996-11-15 | 1999-09-01 | Verity Group Plc | Optical disc reader |
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