JPS54155709A - Corrector for quantity of light for photoelectric conversion - Google Patents
Corrector for quantity of light for photoelectric conversionInfo
- Publication number
- JPS54155709A JPS54155709A JP6379078A JP6379078A JPS54155709A JP S54155709 A JPS54155709 A JP S54155709A JP 6379078 A JP6379078 A JP 6379078A JP 6379078 A JP6379078 A JP 6379078A JP S54155709 A JPS54155709 A JP S54155709A
- Authority
- JP
- Japan
- Prior art keywords
- light
- photoelectric conversion
- original
- peak value
- power voltage
- 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.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 title abstract 5
Landscapes
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To make it possible to obtain the constant quality of photoengraving by keeping a photoelectric conversion peak value invariably constant by enabling a photo-current control circuit to attain the individual or interlocking control of the power voltage of a light source.
CONSTITUTION: The beams of light from light sources 4 and 4' are reflected by original 1 and led to photoelectric converting element 7, which generates an electric signal proportional to the light and shade of the picture element of original 1. For the purpose, element 7 is used whose photoelectric conversion rate depends upon the power voltage, and photo-current control circuit 15 is provided which compares the photoelectric conversion peak value where the reflection factor of the original is the highest to the reference voltage; this circuit 15 performs the individual or interlocking control of the power voltage of element 7 and power voltages of light sources 4 and 4', thereby keeping the photoelectric conversion peak value invariably constant. Consequently, the variation of the quantity of light from original 1 is suppressed to obtain the constant quality of photoengraving.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6379078A JPS54155709A (en) | 1978-05-30 | 1978-05-30 | Corrector for quantity of light for photoelectric conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6379078A JPS54155709A (en) | 1978-05-30 | 1978-05-30 | Corrector for quantity of light for photoelectric conversion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54155709A true JPS54155709A (en) | 1979-12-08 |
| JPS6253984B2 JPS6253984B2 (en) | 1987-11-12 |
Family
ID=13239517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6379078A Granted JPS54155709A (en) | 1978-05-30 | 1978-05-30 | Corrector for quantity of light for photoelectric conversion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54155709A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56147276A (en) * | 1980-04-15 | 1981-11-16 | Ricoh Co Ltd | Manual subscanning type reader |
| JPS571956A (en) * | 1980-06-04 | 1982-01-07 | Fuji Photo Film Co Ltd | Setting device for gain in reading radiation picture information |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4847213U (en) * | 1971-10-05 | 1973-06-21 |
-
1978
- 1978-05-30 JP JP6379078A patent/JPS54155709A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4847213U (en) * | 1971-10-05 | 1973-06-21 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56147276A (en) * | 1980-04-15 | 1981-11-16 | Ricoh Co Ltd | Manual subscanning type reader |
| JPS571956A (en) * | 1980-06-04 | 1982-01-07 | Fuji Photo Film Co Ltd | Setting device for gain in reading radiation picture information |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6253984B2 (en) | 1987-11-12 |
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