| 摘要 |
A light scanning unit having a simple structure and a low-priced multi-beam shape is provided. The light scanning unit includes a composite light source in which a plurality of light sources for emitting coherent light having different wavelengths are arranged adjacent to one another and the optical axis of each light source are arranged substantially parallel to each other, such that the composite light source emits light at a divergence angle centering on an optical axis. The plurality of coherent emitted light comprising a light beam. The light scanning unit further comprises, and an optical system which comprises a collimator lens which is arranged on an approximately central axis of an optical axis of each light source constituting the composite light source, and collimates the light beam emitted from the composite light source, a cylinder lens for condensing the light beam emitted from the collimator lens, and a polygonal rotating mirror for scanning the light beam condensed by the cylinder lens in a main scanning direction on an exposed surface of an exposed object.
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