| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve such a problem: that light rays passing through a part other than a lens part and light rays intruding into an adjacent lens system become stray light and the resolving power is degraded, in an image formation system of forming a linear light source image on an image formation surface which is the surface of photoreceptor etc., with regard to an erect real image optical system constituted by stacking a plurality of lens plates forming a lens array; and that the lens sheet and a light shielding plate deviate from each other to result in the degradation of modulation transfer function (MTF) because a temperature changes when an opaque light shielding plate is inserted between the individual lens plates, and because the linear expansion coefficients are different between the lens sheet and the light shielding plate. <P>SOLUTION: First and second lens plates 11, 12 form an inverted image and form an inverted image of the light source 1 on an intermediate image forming surface 15. A light shielding means S0 provided with an aperture part SA transmitting only the inverted image is arranged on the intermediate image forming surface 15. Third and fourth lens plates 13, 14 and the set of first and second lens plates are disposed symmetrically with respect to the intermediate image forming surface 15. The inverted image of the intermediate image forming surface 15 is formed again as an inverted image on an image surface 3 and, as a result, an same-size erect real image of the light source having a high MTF is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
