JPS6486666A - Original reader - Google Patents
Original readerInfo
- Publication number
- JPS6486666A JPS6486666A JP62242629A JP24262987A JPS6486666A JP S6486666 A JPS6486666 A JP S6486666A JP 62242629 A JP62242629 A JP 62242629A JP 24262987 A JP24262987 A JP 24262987A JP S6486666 A JPS6486666 A JP S6486666A
- Authority
- JP
- Japan
- Prior art keywords
- level
- photoelectric conversion
- signal
- conversion means
- exposure time
- 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
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE:To obtain an excellent reproduced picture by detecting an electric signal corresponding to a white reference board and controlling the exposure time in response to the level of the electric signal thereby outputting the picture signal of a constant level even if the lightness of the light source is fluctuated. CONSTITUTION:A photoelectric conversion means 20 reads a face of an original to be read and reads also the surface of the white reference board 6. A detection means 8 detects a signal corresponding to the surface of the white reference board 6 from the output signal of the photoelectric conversion means 20. A control means 40 applies the control so as to prolong the exposure time of the photoelectric conversion means 20 when the level of the signal detected by the detection means 8 is lower and when the level of the detected signal is high, the control is applied to reduce the exposure time of the means 20. Thus, the output level of the photoelectric conversion means 20 is made constant independently of the fluctuation of the luminous quantity of the light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62242629A JPS6486666A (en) | 1987-09-29 | 1987-09-29 | Original reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62242629A JPS6486666A (en) | 1987-09-29 | 1987-09-29 | Original reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6486666A true JPS6486666A (en) | 1989-03-31 |
Family
ID=17091894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62242629A Pending JPS6486666A (en) | 1987-09-29 | 1987-09-29 | Original reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6486666A (en) |
-
1987
- 1987-09-29 JP JP62242629A patent/JPS6486666A/en active Pending
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