Patent ID: 7782353
Filing Date: 2010-08-24
Classification: G02B,G03G

Abstract:
1. An image-forming device comprising: a main casing; and a plurality of image-carrying members, provided in a main casing, for rotating about respective rotational axes, and juxtaposed in a single direction; and an optical scanning unit provided in the main casing comprising: a plurality of laser generators provided one-to-one relationship to the plurality of image-carrying members to emit respective laser beams; a single rotatable polygon mirror that deflects the respective laser beams to scan the respective image-carrying members therewith; a plurality of mirrors wherein each of the plurality of mirrors corresponds to one of the plurality of image-carrying members to guide the respective laser beams along respective optical paths to the respective image-carrying members; and a plurality of lenses, wherein each of the plurality of lenses corresponds to one of the plurality of image-carrying members, and each lens of the plurality of lenses is provided in the respective optical path of the corresponding image-carrying members, and between the respective mirrors and the respective image-carrying members, and wherein distances from the respective mirrors to the respective image-carrying members are substantially equal to one another for each corresponding mirror and image-carrying member, wherein the optical scanning unit comprises: