| 摘要 |
An exposure head includes first and second light-emitting element rows formed by disposing light-emitting elements in a first direction on a light-transmitting substrate. A first photosensor is disposed at a first side in a second direction perpendicular to the first direction on the light-transmitting substrate to receive light emitted from the light-emitting elements of the first and second light-emitting element rows. A second photosensor is disposed in the second direction at a second side opposite to the first side on the light-transmitting substrate to receive light emitted from the light-emitting elements of the first and second light-emitting element rows. An image-forming optical system forms an image with light emitted from the light-emitting elements.
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