Patent ID: 7663792

Claim:
A reflection mirror unit for a document on a platen, comprising: first and second reflection mirrors, a base frame comprising a plate member and having a sliding portion adapted to slidably engage a guide rail located in a sub-scanning direction for the document on the platen, and first coupling portions, and a mirror support frame comprising a plate member and having a mirror mounting portion for supporting the first and second reflection mirrors opposite to each other with a predetermined angle, and second coupling portions coupled with the first coupling portions by which the mirror support frame is coupled to the base frame, wherein the mirror mounting portion comprises a pair of opposite bent pieces formed by bending the mirror support frame so as to support opposite ends of the first and second reflection mirrors in a main scanning direction, the first coupling portions of the base frame comprises slit fitting holes engaging the pair of bent pieces, each of the slit fitting holes has sandwiching sidewall surfaces that define a distance between the pair of bent pieces in the main scanning direction and an abutting surface that defines a position of the bent piece in the sub-scanning direction, and each of the second coupling portions of the mirror support frame comprises a slit recessed groove formed in each of the pair of bent pieces so that when the second coupling portion is fitted into the slit-like fitting hole, the second coupling portion defines vertically opposite positions of the first and second reflection mirrors.