Patent ID: 7760409
Filing Date: 2010-07-20
Classification: G02B

Abstract:
1. An optical beam scanning apparatus comprising: a housing unit having plural positioning members, a light source configured to emit one or plural luminous fluxes, a pre-deflection optical system configured to form a luminous flux emitted from the light source to image the luminous flux as a line image in a direction corresponding to a main scanning direction, a scanning unit configured to scan the imaged luminous flux by the pre-deflection optical system against a scanning subject, and a post-deflection optical system configured to image the luminous flux scanned by the scanning unit on the scanning subject, in which at least one optical parts configured to image the luminous flux scanned from the scanning unit on the scanning subject is provided, the optical parts having plural projections provided on a vertical surface to the sub-scanning direction formed in the effective region in the optical parts, through which the luminous flux passes, the projection being protruded in the sub-scanning direction, the respective projections being interfitted into an engaging groove to be a pair with the projection which the positioning member has and then engaged in a concave-convex shape with the housing unit in the main scanning direction, and the positioning member supporting the projection while being made opposing to the projection.