| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for suppressing the strength of ghost light. SOLUTION: The exposure head includes a reflected light attenuating member disposed between the first and second light emitting chips of a substrate. The optical length of a first imaging optical system has the following relations: h1<h4<h3 and h2<h4<h3, wherein h1 is the length of the first light emitting chip in the direction of an optical axis, h2 is the length of the second light emitting chip in the direction of the optical axis, h3 is a distance between the substrate and a light shielding portion in the direction of the optical axis, and h4 is the length of the reflected light attenuating member in the direction of an optical axis. COPYRIGHT: (C)2011,JPO&INPIT |
