JPS5722266A - Exposure control device for copying machine - Google Patents
Exposure control device for copying machineInfo
- Publication number
- JPS5722266A JPS5722266A JP9720280A JP9720280A JPS5722266A JP S5722266 A JPS5722266 A JP S5722266A JP 9720280 A JP9720280 A JP 9720280A JP 9720280 A JP9720280 A JP 9720280A JP S5722266 A JPS5722266 A JP S5722266A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- output voltage
- reference voltage
- trigger pulse
- 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
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To automatically obtain always optimum exposure by adding the output voltage of a photodetecting circuit to the output voltage of a voltage forming circuit, applying the same to a comparator, comparing the same with preset reference voltage and controlling the quantity of light of an exposure lamp. CONSTITUTION:If there is an error between the output voltage of a waveform shaping circuit 34 and the reference voltage from a reference voltage generating circuit 39, the output voltage of an error amplifier 37 increases or decreases in accordance with the size of said error, in accordance with which, the generating phase of the trigger pulse outputted from a trigger pulse generating circuit 41 changes as well. Hence, the conduction angle of a thyristor 32 changes and this change is fed back to the amplifier 37 by the trigger pulse to a spurious load circuit 33. Therefore, the device operates as a whole in such a way that the output voltage of the circuit 34 is made equal to the reference voltage from the circuit 39, that is, the voltage applied across an exposure lamp 2 is made constant at all times against the voltage fluctuations of a power source 31.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9720280A JPS5722266A (en) | 1980-07-16 | 1980-07-16 | Exposure control device for copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9720280A JPS5722266A (en) | 1980-07-16 | 1980-07-16 | Exposure control device for copying machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5722266A true JPS5722266A (en) | 1982-02-05 |
JPS639208B2 JPS639208B2 (en) | 1988-02-26 |
Family
ID=14186016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9720280A Granted JPS5722266A (en) | 1980-07-16 | 1980-07-16 | Exposure control device for copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5722266A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0722843A (en) * | 1993-06-30 | 1995-01-24 | Nec Corp | Modulation degree control circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5182630A (en) * | 1975-01-16 | 1976-07-20 | Minolta Camera Kk |
-
1980
- 1980-07-16 JP JP9720280A patent/JPS5722266A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5182630A (en) * | 1975-01-16 | 1976-07-20 | Minolta Camera Kk |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0722843A (en) * | 1993-06-30 | 1995-01-24 | Nec Corp | Modulation degree control circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS639208B2 (en) | 1988-02-26 |
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