JPS5455317A - Control system for quantity of light of pickup unit - Google Patents
Control system for quantity of light of pickup unitInfo
- Publication number
- JPS5455317A JPS5455317A JP12281677A JP12281677A JPS5455317A JP S5455317 A JPS5455317 A JP S5455317A JP 12281677 A JP12281677 A JP 12281677A JP 12281677 A JP12281677 A JP 12281677A JP S5455317 A JPS5455317 A JP S5455317A
- Authority
- JP
- Japan
- Prior art keywords
- light
- accumulation time
- light source
- charge accumulation
- variation
- 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
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To make it possible to hold a read signal level constant even if the an accumulation time varies with the period of a clock pulse, by detecting the variation of a charge accumulation type solid pickup element and by making a light-quantity control circuit control the quantity of light of a light source.
CONSTITUTION: Original 1, while being irradiated with light source 7, is read out by charge accumulation type solid pickup element 2, thereby driving video process amplifier 8. Velocity detector 5 detecting the variation in accumulation time of element 2 outputs its detection result to light-quantity control circuit 6, where the quantity of light of light source 7 is controlled. As a result, the quantity of light incident upon element 2 per unit time is varied in inverse proportion to the charge accumulation time of element 2, so that even if the accumulation time varies with the period of a clock pulse, it can be made possible to hold a read signal level constant
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12281677A JPS5455317A (en) | 1977-10-13 | 1977-10-13 | Control system for quantity of light of pickup unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12281677A JPS5455317A (en) | 1977-10-13 | 1977-10-13 | Control system for quantity of light of pickup unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5455317A true JPS5455317A (en) | 1979-05-02 |
Family
ID=14845337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12281677A Pending JPS5455317A (en) | 1977-10-13 | 1977-10-13 | Control system for quantity of light of pickup unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5455317A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56147275A (en) * | 1980-04-15 | 1981-11-16 | Ricoh Co Ltd | Manual subscanning type reader |
JPS583666U (en) * | 1981-06-30 | 1983-01-11 | 株式会社島津製作所 | image input device |
JPS6276965A (en) * | 1985-09-30 | 1987-04-09 | Nippon Kogaku Kk <Nikon> | Picture signal processor for ccd line sensor |
-
1977
- 1977-10-13 JP JP12281677A patent/JPS5455317A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56147275A (en) * | 1980-04-15 | 1981-11-16 | Ricoh Co Ltd | Manual subscanning type reader |
JPS6364935B2 (en) * | 1980-04-15 | 1988-12-14 | ||
JPS583666U (en) * | 1981-06-30 | 1983-01-11 | 株式会社島津製作所 | image input device |
JPS636937Y2 (en) * | 1981-06-30 | 1988-02-27 | ||
JPS6276965A (en) * | 1985-09-30 | 1987-04-09 | Nippon Kogaku Kk <Nikon> | Picture signal processor for ccd line sensor |
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