ROTARY POLYGON MIRROR AND ITS MANUFACTURE

摘要

PURPOSE:To form the rotary polygon mirror easily at low manufacturing cost by providing a resin film which has a reflecting mirror surface molded by using a specular surface mold on flanks of polygonal shape parts of a base material molded out of aluminum or aluminum alloy material. CONSTITUTION:The base material which is in the shape of, for example, a regular hexagonal prism and has a through hole 4 for installing a rotary polygon mirror coaxial with the center axis of a regular hexagon onto a rotary driving shaft in its center is molded out of aluminum or aluminum alloy. A resin film 2 given surface precision as a reflecting mirror surface 2a molded by a specular surface mold is provided on >=1 flank that the polygonal shape part of the base material 1 has. A film 3 which functions as a reflection enhancing film and/or protection film is provided on the reflecting surface 2a.