Copying apparatus provided with an automatic light exposure control system

Claim 1

A copying apparatus comprising: a light source for transmitting a defined amount of light onto an original document to be copied and an automatic light exposure control system for selectively setting the amount of said transmitted light from said light source on the basis o data of light reflected by said original document and data of light reflected from a reference document at a plurality of levels, said automatic light exposure control system including a RAM, means for detecting data in the amount of reflected light from a reference document to which light is applied at a plurality of levels, a storage means for storing said data of reflected light corresponding to said plurality of levels with respect to said reference document, said storage means consisting of a memory area provided in said RAM, and an exposure control means for regulating said defined amount of light from said light source at said plurality of levels relative to said reflected light from said reference document and light reflected from said original document; whereby the amount of transmitted light from said light source is automatically controlled on the basis of said data of reflected light of the reference document stored in said storage means and said data of reflected light of said original document to be copied.