Exposure device and method for producing the same

摘要

There is provided an exposure device including an exposure head having a light-emitting member which has a plurality of light-emitting sections arranged in a row and a casing which holds the light-emitting member and which is elongated in a longitudinal direction orthogonal to an optical axis direction of a light emitted from the light-emitting sections; and an elongated frame member fixed to the casing and having a reference portion at which the frame member is positioned with respect to the light-emitting sections; wherein the frame member is fixed to the casing such that the frame member is positioned with respect to the light-emitting sections in both of the longitudinal direction and a width direction of the casing, the width direction being orthogonal to the longitudinal direction and the optical axis direction. The exposure device is capable of performing exposure precisely at a desired exposure position.

主权项

1. An image forming apparatus, comprising:
a photosensitive drum; an exposure head having a first edge and a second edge separated from the first edge in a longitudinal direction, the exposure head having a first length in the longitudinal direction, and the exposure head including:
a light-emitting member which comprises a plurality of light-emitting sections arranged in the longitudinal direction; anda casing configured to hold the light-emitting member; and a supporting member having a second length, in the longitudinal direction, that is longer than the first length and having a third edge and a fourth edge separated from the third edge in the longitudinal direction, the supporting member being disposed at a side, of the exposure head, opposite to the photosensitive drum, wherein the supporting member supports the exposure head at a point between the first edge and the second edge in the longitudinal direction, wherein the supporting member holds the exposure head at a distance away from a surface of the supporting member that faces the exposure head, and wherein the supporting member comprises:
a first protrusion extending beyond the exposure head toward a surface of the photosensitive drum, the first protrusion being disposed between, in the longitudinal direction, the third edge of the supporting member and the first edge of the exposure head;a second protrusion extending beyond the exposure head toward a surface of the photosensitive drum, the second protrusion being disposed between, in the longitudinal direction, the fourth edge of the supporting member and the second edge of the exposure head;a first cam positioned between the surface of the supporting member and the exposure head, the first cam being positioned at a point between the first edge and the second edge in the longitudinal direction, and the first cam being configured to hold the exposure head at the distance away from the surface of the supporting member;a second cam positioned between the surface of the supporting member and the exposure head, the second cam being positioned at a point between the first edge and the second edge in the longitudinal direction, and the second cam being configured to hold the exposure head at the distance away from the surface of the supporting member; anda first positioning pin arranged between the first cam and the second cam to position the supporting member with respect to the exposure head, the first positioning pin being inserted into a first hole of the exposure head.