Inner drum exposure apparatus

摘要

The inner drum exposure apparatus records an image by scanning a recording material held on an arcuate inner peripheral surface of a support with a circularly polarized light beam that is emitted from a light source and modulated in accordance with image information and deflected by a total internal reflection mirror plane of a rotatably driven scanning device such as a spinner. The image is record on the recording material by scanning the recording material with the modulated light beam using the scanning unit. The scanning unit further includes an optical member having on its surface a polarizing beam splitter plane spaced apart from the mirror plane by a predetermined distance. Two beam spots formed on the recording material by two parallel beams obtained by the polarizing beam splitter plane and the mirror plane are combined into a synthetic beam spot in which the beam spots are disposed side by side in a sub scanning direction so as to overlap each other.