Patent ID: 7515322
Filing Date: 2009-04-07
Classification: G02B

Abstract:
1. A beam scanning device, comprising: a light source to emit a light beam; an optical deflector to deflect the light beam; an optical system including a fθ lens to guide the defected light beam to a scan surface to form an image thereon; a synchronization detecting sensor to detect the deflected light beam outside an area of the image; a light blocking member configured to block the deflected light beam on an exit side of said fθ lens outside an effective scan area that includes the area of the image and also includes an optical path extending to said synchronization detecting sensor; and a metal housing accommodating said light source, said optical deflector, said optical system, said light blocking member, and said synchronization detecting sensor, wherein said light blocking member is separate from said fθ lens, and is configured to block the deflected light beam on the exit side of said fθ lens in a region that extends in a beam scan direction from a discontinuous point of said fθ lens to outside the effective scan area, wherein said light blocking member is a single integral piece made of a metal plate including: