Beam scanning apparatus.

摘要

The improved beam scanning apparatus has an optical element (3) that is driven to rotate by means of a drive means so as to be capable of continuous angular displacement with respect to the beam from a light source (1). The optical element (3) deflects the incident beam so that it is focused to form image on the image plane (5). It is provided with an entrance face (S1), a reflecting face (S2) and an exit face (S3) which have their shape specified in such a way as to achieve effective correction of aberration, provide higher resolution, and reduce the size and cost of the apparatus. <IMAGE>