EXPOSURE DEVICE

PURPOSE:To obtain an exposure control function by means of an electrical signal at low cost by arranging a reflection type optical modulation element on the position of arranging an object to be copied in a device where a sensitive body is exposed with reflecting light beams from the object to be copied such as an original, etc. CONSTITUTION:In the device which copies to expose the character and picture information of an original, etc., in the sensitive body as optical quantity, the reflection type optical modulation element 10 whose reflection characteristic is altered by means of the electrical signal is arranged on the position of arranging the object to be copied. When the electrical signal is turned off, incident light beams 1 are transmitted or reflected as it is so that the light beams do not reach the sensitive body 7, but when the electrical signal is turned on, the light beams 1 become a scattered reflecting light beams 2 and a part of the scattered light beams passes through an optical lens 5 to expose the sensitive body 7. Thus the exposure of the sensitive body 7 can be controlled.