| 摘要 |
An image-exposing apparatus includes an optical device which mixes lights coming from different directions and emits a mixed light in a unilateral direction. The optical device includes first, second and third transparent members receiving first, second and third lights from first, second and third light-emitting element rows, respectively, a first composition plane, at which the first and second transparent members are joined and form a first light selective film, a second composition plane, at which the first and third transparent members are joined and form a second light selective film, and a wavelength controlling element which excludes a wavelength region of the first light from a region between a wavelength at which P-polarization changes from transmission to reflection in the first composition plane and another wavelength at which S-polarization changes from transmission to reflection in the first composition plane.
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