JPS5722262A - Exposure control device for copying machine - Google Patents
Exposure control device for copying machineInfo
- Publication number
- JPS5722262A JPS5722262A JP9677680A JP9677680A JPS5722262A JP S5722262 A JPS5722262 A JP S5722262A JP 9677680 A JP9677680 A JP 9677680A JP 9677680 A JP9677680 A JP 9677680A JP S5722262 A JPS5722262 A JP S5722262A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- light
- original
- thyristor
- control device
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
PURPOSE:To make a titled device more reliable and improve operativity by controlling the quantity of light of a light source for exposure by electronic phase angle controlling. CONSTITUTION:In the case of an original of a dark ground texture, the reflected light from the original is less, and consequently the output voltage of a photodetecting circuit 36 is low. Then, a trigger pulse generating circuit 37 and a trigger circuit 39 control a thyristor 32 so as to increase its conduction angle, thereby increasing the quantity of light of a fluorescent lamp 2. On the other hand, in the case of an originl of a pale ground texture, the reflected light from the original increases, and consequently the output voltage of the circuit 36 is high. Then, the circuit 37 and the circuit 39 control the thyristor 32 so as to decrease its conduction angle, thereby decreasing the quantity of light of the lamp 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9677680A JPS5722262A (en) | 1980-07-15 | 1980-07-15 | Exposure control device for copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9677680A JPS5722262A (en) | 1980-07-15 | 1980-07-15 | Exposure control device for copying machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5722262A true JPS5722262A (en) | 1982-02-05 |
JPH0448377B2 JPH0448377B2 (en) | 1992-08-06 |
Family
ID=14174031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9677680A Granted JPS5722262A (en) | 1980-07-15 | 1980-07-15 | Exposure control device for copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5722262A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59116729A (en) * | 1982-12-24 | 1984-07-05 | Sanpack:Kk | Light source for photography |
JPS59185320A (en) * | 1983-04-07 | 1984-10-20 | Sanpack:Kk | Photographing light source for video or the like |
JPS60120337A (en) * | 1983-12-05 | 1985-06-27 | Sanpack:Kk | Light source for photography or video taking |
JPH0314634U (en) * | 1990-06-26 | 1991-02-14 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5182630A (en) * | 1975-01-16 | 1976-07-20 | Minolta Camera Kk | |
JPS5548766A (en) * | 1978-10-04 | 1980-04-08 | Ricoh Co Ltd | Dimming method of copying machine |
-
1980
- 1980-07-15 JP JP9677680A patent/JPS5722262A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5182630A (en) * | 1975-01-16 | 1976-07-20 | Minolta Camera Kk | |
JPS5548766A (en) * | 1978-10-04 | 1980-04-08 | Ricoh Co Ltd | Dimming method of copying machine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59116729A (en) * | 1982-12-24 | 1984-07-05 | Sanpack:Kk | Light source for photography |
JPS59185320A (en) * | 1983-04-07 | 1984-10-20 | Sanpack:Kk | Photographing light source for video or the like |
JPS60120337A (en) * | 1983-12-05 | 1985-06-27 | Sanpack:Kk | Light source for photography or video taking |
JPH0314634U (en) * | 1990-06-26 | 1991-02-14 | ||
JPH0535386Y2 (en) * | 1990-06-26 | 1993-09-08 |
Also Published As
Publication number | Publication date |
---|---|
JPH0448377B2 (en) | 1992-08-06 |
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