| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily adjust the optical axis of a lens array used for an optical printing head. SOLUTION: A lens array 50 with a group of rod lenses 51 arranged with the optical axes parallel with each other, is inserted in a gap 32 between a pair of parallel walls 31a, 31b of holders 30a, 30b. The gap 32 has a width capable of tolerating tilt of the lens array 50. The parallel walls 31a, 31b have screw holes 39a, 40a, 41a, 30b, 40b, 41b of a plurality of kinds at different positions in the lens 51 optical axis direction such that the lens array is held between the tip ends of screws 42 screwed into the screw holes.</p> |
