JPS55166772A - Light quantity control system of optical reader - Google Patents
Light quantity control system of optical readerInfo
- Publication number
- JPS55166772A JPS55166772A JP7529979A JP7529979A JPS55166772A JP S55166772 A JPS55166772 A JP S55166772A JP 7529979 A JP7529979 A JP 7529979A JP 7529979 A JP7529979 A JP 7529979A JP S55166772 A JPS55166772 A JP S55166772A
- Authority
- JP
- Japan
- Prior art keywords
- light
- read
- light source
- detected
- control system
- 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 keep the quantity of real light constant by photodetecting light which does not contribute to a code read and controlling the quantity of light from light source, based on the photo-detected light. CONSTITUTION:The code of article 7 placed on scanning window 6 is read with light arriving from light source 1 by way of reflecting plate 2 and rotary mirror 13. Reflecting plate 2 is driven at not less than a normal read scanning angle. Then, light which does not contribute to the read is detected by photodetecting method 9. The detected light is led to light source driving method 11 via feedback method 10. Consequently, the quantity of light from light source 1 can be kept constant without reference fluctuations of a temperature, etc.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7529979A JPS55166772A (en) | 1979-06-14 | 1979-06-14 | Light quantity control system of optical reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7529979A JPS55166772A (en) | 1979-06-14 | 1979-06-14 | Light quantity control system of optical reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55166772A true JPS55166772A (en) | 1980-12-26 |
Family
ID=13572222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7529979A Pending JPS55166772A (en) | 1979-06-14 | 1979-06-14 | Light quantity control system of optical reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55166772A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60115910A (en) * | 1983-11-28 | 1985-06-22 | Kubota Ltd | Beam light projecting device |
JPS60129724A (en) * | 1983-12-19 | 1985-07-11 | Canon Inc | Optical laser scanning device |
EP0158288A2 (en) * | 1984-04-11 | 1985-10-16 | Sharp Kabushiki Kaisha | Photoelectric reading apparatus |
-
1979
- 1979-06-14 JP JP7529979A patent/JPS55166772A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60115910A (en) * | 1983-11-28 | 1985-06-22 | Kubota Ltd | Beam light projecting device |
JPH0335645B2 (en) * | 1983-11-28 | 1991-05-29 | Kubota Kk | |
JPS60129724A (en) * | 1983-12-19 | 1985-07-11 | Canon Inc | Optical laser scanning device |
EP0158288A2 (en) * | 1984-04-11 | 1985-10-16 | Sharp Kabushiki Kaisha | Photoelectric reading apparatus |
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