JPS552212A - Copying apparatus - Google Patents
Copying apparatusInfo
- Publication number
- JPS552212A JPS552212A JP7387278A JP7387278A JPS552212A JP S552212 A JPS552212 A JP S552212A JP 7387278 A JP7387278 A JP 7387278A JP 7387278 A JP7387278 A JP 7387278A JP S552212 A JPS552212 A JP S552212A
- Authority
- JP
- Japan
- Prior art keywords
- light
- lamps
- detector
- change
- fluorescent lamp
- 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 prevent the change in image density with a change in the quantity of light of exposure lamps by directly detecting the change in the quantity of light of fluorescent lamps which cannot be achieve only by tube wall temperature controlling of the fluorescent lamps and automatically controlling the developing bias voltage according to the detection contents. CONSTITUTION:A pair of fluorescent lamps 2, 2 as exposure lamps are provided in the position below an original platen 1. A detector 6 is provided near the fluorescent lamp 2. The detector 6 detects the quantity of light of the fluorescent lamp 2 with its photometric element such as Cds element or photodiode and converts the same to an electric signal. The output signal of the detector 6 is supplied a control circuit 7 consisting of a light quantity detecting circuit 8, changeover switch 9 and bias resistances 101 thru 103 of respectively different resistance values. The light quantity detecting circuit 8 compares the quantity of light of the fluorescent lamp 2 having been detected and the preset optimum exposure and controls the changeover switch 9 according to this, thereby controlling the developing bias voltage being applied to a developing device 12.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7387278A JPS552212A (en) | 1978-06-19 | 1978-06-19 | Copying apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7387278A JPS552212A (en) | 1978-06-19 | 1978-06-19 | Copying apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS552212A true JPS552212A (en) | 1980-01-09 |
Family
ID=13530708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7387278A Pending JPS552212A (en) | 1978-06-19 | 1978-06-19 | Copying apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS552212A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0223237A2 (en) * | 1985-11-18 | 1987-05-27 | Kabushiki Kaisha Toshiba | Automatic developing apparatus |
JPH03239272A (en) * | 1990-02-17 | 1991-10-24 | Canon Inc | Illuminating device and copying device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5243439A (en) * | 1975-10-03 | 1977-04-05 | Ricoh Co Ltd | Generator for the bias voltage for the electrophotographic copying machine |
-
1978
- 1978-06-19 JP JP7387278A patent/JPS552212A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5243439A (en) * | 1975-10-03 | 1977-04-05 | Ricoh Co Ltd | Generator for the bias voltage for the electrophotographic copying machine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0223237A2 (en) * | 1985-11-18 | 1987-05-27 | Kabushiki Kaisha Toshiba | Automatic developing apparatus |
JPH03239272A (en) * | 1990-02-17 | 1991-10-24 | Canon Inc | Illuminating device and copying device |
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