Scanning exposure type image forming device

Abstract

Abstract PURPOSE:To make an equivalent projecting surface coincide with an equivalent focusing surface and to prevent the occurrence of defocusing and strain by installing a rotation driving means for setting a tilt angle and a shift driving means for correcting the length of an optical path on the supporting part of a scanning mirror. CONSTITUTION:The rotation driving means 13 installed on the supporting part 12 of the scanning mirror 3 drives a motor M3 to control the tilt angle alpha of the scanning mirror 3. The shift driving means 14, on the other hand, shifts the supporting board 15 for the motor M2 to the optical axis direction (y) of a projecting lens with the aid of a motor M1, a boring screw 16 and a guide frame 17 so as to control the position in the (y) direction of the scanning mirror 3. In such constitution, the tilt angle alpha and the shift position (y) of the scanning mirror 3 can be simultaneously adjusted and the equivalent projecting surface C of a point (f) on a microfilm 1 can be made coincide with a point P on the equivalent focusing surface H, so that the defocusing and the strain of a copied image can be prevented from occuring.

Inventors

• 👤 Satoshi Iwasaki

Bibliographic Details