| 摘要 |
<p>PROBLEM TO BE SOLVED: To form a good printing image free from density irregularity by making it possible to almost equally arrange the intensities and sizes of all of beams irradiating a photosensitive element through an aspherical lens to effectively prevent the generation of beam blur. SOLUTION: A plurality of light emitting element arrays 2 formed by linearly arranging a large number of light emitting elements 2a are arranged on a base plate in a row and a plurality of aspherical lenses corresponding to the light emitting element arrays 2 in a ratio of 1:1 to constitute an optical printing head. In this printing head, the length of the light emitting elements 2a positioned in both end regions of the light emitting element arrays 2 is made larger than that of the light emitting elements 2a positioned in the central region of each of the arrays and a cylindrical lens 4 changed in curvature corresponding to the length of the light emitting elements 2a is arranged between the light emitting element arrays 2 and the aspherical lens.</p> |
