Patent ID: 9091957
Filing Date: 2015-07-28
Classification: G03G

Abstract:
1. An optical writer comprising: a light source substrate including a base and a plurality of light sources disposed on the base; a rod lens array comprising a plurality of rod lenses having an optical axis, the rod lens array having a higher linear expansion coefficient than a linear expansion coefficient of the base of the light source substrate and the rod lens array being configured to condense light from the light sources onto an image retainer; a holder supporting the light source substrate and the rod lens array; and restraining plates bonded to respective elongated faces of the rod lens array with thin adhesive layers, the elongated faces being parallel to the optical axis of the rod lenses, wherein the light source substrate is bonded directly or via an intermediate member to the holder with a thin adhesive layer, the rod lens array is bonded via the restraining plates to the holder with adhesive layers which are thicker than the thin adhesive layer, the restraining plates each have a shorter length in a direction perpendicular to the elongated faces of the rod lens array than a length of the restraining plate in a direction of the optical axis, and the restraining plates and the holder each have a lower linear expansion coefficient than the linear expansion coefficient of the rod lens array.