PURPOSE:To improve the optical response characteristics of a complete adhesion type direct reading photoelectric conversion device by simultaneously irradiating a photoelectric conversion element with a bias in the fixed amount of light from the back of the photoelectric conversion element together with reflected beams from a draft. CONSTITUTION:Beams from a light source 7 are projected from the back of a glass substrate 1 through a lighting window 3, and transmitted beams 10 from a light-shielding film 2 are introduced to a photoelectric conversion elememt 5 as bias beams in a fixed amount together with reflected beams 9 from a draft surface 8. Since bias beams are applied in this manner, optical response is reduced, and the speed of operation of a facsimile, etc. can be increased. Since bias beams in the fixed amount of light are projected to the photoelectric conversion element at all times in comparison with reflected beams as a draft signal, on the other hand, an S/N ratio is lowered, but the ratio is negligible when it is brought to 1/10 or less.
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