Polarization bimusupuritsuta null for laser printer device

摘要

PURPOSE: To provide a polarizing beam splitter for a laser printer device where the fluctuation of quenching ratio to the fluctuation of the incident angle of incident light is restrained to be small. ;CONSTITUTION: In the polarizing beam splitter 107 for the laser printer device which is provided with a multilayer film 303 on the bonded surface of a pair of prisms 301 and 302, and which branches an energy beam made incident at the incident angle in accordance with a scanning angle at each position on the bonded surface after scanning in the major axis direction of the prism with center at an incident position at a Brewster's angle in order to simultaneously form electrostatic latent images at two spots of a photoreceptor to two directions in accordance with a polarized light component; the optical film thickness of each thin film constituting the multilayer film 303 is set thinner than the optical film thickness that the optical path length of the energy beam made incident at the Brewster's angle is about λ₀/4.;COPYRIGHT: (C)1995,JPO