Patent ID: 6339491
Filing Date: 2002-01-15
Classification: B41J,G02B

Abstract:
A dustproof structure of an optical box, which is used in an optical box which includes a light source section which emits laser beams, a polygon section comprised of deflecting means for deflecting laser beams and an optical system by which laser beams deflected by the deflecting means are converged on a photosensitive material, and an exit section which emits the laser beams emitted from the polygon section outside the optical box, comprising:an opening formed in the optical box for guiding the laser beams to the photosensitive material; and pressurizing means for pressurizing an interior of the optical box by supplying air to the interior of the optical box, thereby preventing intrusion of dust from said opening and from outside of the optical box, wherein the light source section, the polygon section, and the exit section are provided in such a manner that differences in the degree of sealing are made among chambers in which the three sections are disposed by partitioning.