EXPOSURE DEVICE AND IMAGE FORMING APPARATUS USING IT

摘要

PROBLEM TO BE SOLVED: To provide an exposure device for controlling light intensity with high precision by improving reliability of light intensity detection therein and an image forming apparatus using the exposure device.

SOLUTION: The exposure device includes a light emitting element array having a plurality of organic electroluminescent elements 110 arranged on a substrate, a light detecting element 120 that detects light emitted from the organic electroluminescent elements 110, and a light intensity detecting circuit C that processes an output of the light detecting element 120. The light intensity detecting circuit C includes a capacitive element 140 connected to the light detecting element 120 and a select-transistor 130 that is connected to the capacitive element 140 and draws out charges accumulated in the capacitive element 140. Furthermore, the select-transistor 130 and the light detecting element 120 are isolated from each other with the capacitive element 140 interposed therebetween.

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