Image forming method

Abstract

An image-forming method using an exposure head having plural beam light sources that correspond to each exposure point and that emit each light with the same wavelength, to subject to exposure a light-sensitive material provided at least with a light-sensitive silver halide emulsion and a binder on a support, which method comprises arranging M sets of the beam light sources in a sub-scanning direction, perpendicular to a main scanning direction, along which the exposure head is moved, at predetermined intervals, and allowing the light-sensitive material to move in the sub-scanning direction, in steps of a distance of (the length of the exposure head in the aligned direction)/N (N≧2), to carry out superposing exposure N times, with an exposure time per exposure being 10−3 sec or less, thereby forming M×N pixels per exposure head in every M sets of exposure point, to form an image, wherein the silver halide emulsion contains Ir, in an amount to be added of 10−7 to 10−10 mol per mol of silver halide. This method can eliminate or improve uneven density of exposure, particularly streaks on an image caused by a difference in the hysteresis-of multiple exposure of light source points at both ends of an exposure head in a scanning exposure-type image-forming method that uses in which plural exposure light sources whose exposure time per exposure is 10-3 sec or less.

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