OPTICAL SCANNING DEVICE, AND IMAGE FORMING APPARATUS EQUIPPED WITH THE SAME

摘要

An optical scanner includes a polygonal mirror; a mirror for reflecting the beam from the polygonal mirror; an optical box having a cap and containing the mirror;a first mirror regulating portion in a direction of a normal line of the mirror, the first regulating portion being provided opposed to such a surface of the reflecting surface and a back surface as is closer to the cap; and a second mirror regulating portion in a beam sub-scanning direction, the second regulating portion being provided opposed to such a surface of the mirror as is closer to the cap; wherein the mirror has a plurality of apex lines, and the first regulating portion and the second regulating portion are disposed at positions which are remoter from the cap than the apex line that is closest to the cap, with respect to a direction perpendicular to a main scan direction.

主权项

1. An optical scanning apparatus comprising:
a light source; a rotatable polygonal mirror for deflecting a beam from said light source; a mirror for reflecting the beam deflected by said rotatable polygonal mirror toward a predetermined surface; an optical box and a closing member mounted to said optical box, wherein said mirror is accommodated in a space defined by said optical box and said closing member; a first regulating portion for regulating a movement of said mirror in a direction of a normal line of a reflecting surface of said mirror, said first regulating portion being provided opposed to such a surface of the reflecting surface of said mirror and a back surface of said mirror as is closer to said closing member; and a second regulating portion for regulating a movement of said mirror in a beam sub-scanning direction of said mirror, said second regulating portion being provided opposed to such a surface of surfaces of said mirror perpendicular to the sub-scanning direction as is closer to said closing member; wherein said mirror has a plurality of apex line, and said first regulating portion and said second regulating portion are disposed at positions which are remoter from said closing member than the apex line that is closest to said closing member, with respect to a direction perpendicular to a main scan direction.