| 摘要 |
A light source device includes a light source, a coupling lens, a first opening plate, a second opening plate, a photoreceptor, a package member, a cover glass, a half mirror, and a light source control device. In relation to a main-scanning corresponding direction and a sub-scanning corresponding direction, divergence angles &thetas;m and &thetas;s of a light beam output from the light source, emission angles &thetas;m1 and &thetas;s1 of a light beam passing through an opening portion A, and emission angles &thetas;m2 and &thetas;s2 of a light beam passing through an opening portion B satisfy relationships |(&thetas;m1-&thetas;m2)/&thetas;m|≦̸0.085 and |(&thetas;s1-&thetas;s2)/&thetas;s|≦̸0.085.
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