IMAGE FORMING APPARATUS

PURPOSE:To reduce the cost of an image forming apparatus by changing the operating condition f an automatic exposure sensor so as to actuate the sensor also as a copy detecting sensor. CONSTITUTION:Light radiated from the light emitting portion of an automatic exposure(AE) sensor 5 which detects cop...

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description PURPOSE:To reduce the cost of an image forming apparatus by changing the operating condition f an automatic exposure sensor so as to actuate the sensor also as a copy detecting sensor. CONSTITUTION:Light radiated from the light emitting portion of an automatic exposure(AE) sensor 5 which detects copy density is applied to a copy and the reflected light is received by a light receiving portion. The quantity of the reflected light is received with the density of the copy and the output is varied accordingly. When signals for turning transistors Tr 1 and Tr 2 on are applied to respective terminals 1, 2 at a set value changing device 6 the gain 1 and the reference value of a set value for AE are selected. When signals for turning the transistors Tr 1, Tr 2 off are applied to the respective terminals 1, 2 the gain 2 and the reference value of a set value for copy detection are selected. The sensor for detecting copy density is thus used also as a sensor for detecting copies by changing the operating condition of the sensor.
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CONSTITUTION:Light radiated from the light emitting portion of an automatic exposure(AE) sensor 5 which detects copy density is applied to a copy and the reflected light is received by a light receiving portion. The quantity of the reflected light is received with the density of the copy and the output is varied accordingly. When signals for turning transistors Tr 1 and Tr 2 on are applied to respective terminals 1, 2 at a set value changing device 6 the gain 1 and the reference value of a set value for AE are selected. When signals for turning the transistors Tr 1, Tr 2 off are applied to the respective terminals 1, 2 the gain 2 and the reference value of a set value for copy detection are selected. 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subjects ACCESSORIES THEREFOR
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
title IMAGE FORMING APPARATUS
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