Patent Number: 7,612,939

Title: Transmissive phase plate, polarized beam splitter, and projection display

Abstract: A transmissive phase plate with a function of correcting direction of polarization of light rays in an incident divergent or convergent light flux in addition to functions as a wave plate. Conditions of polarization of incident light rays are corrected by a polarization-correcting optical multi-layer coating which is formed by alternately depositing a high refractivity layer and a low refractivity layer on curved substrative surface of a predetermined radius of curvature. The transmissive phase plate can be applied to correct conditions of polarization of incident light rays of a polarized beam splitter for the purpose of improving contrast ratio of a projection display.

Inventors: Kato; Shigeru (Tochigi, JP), Komatsu; Takuya (Tochigi, JP), Kawamura; Yoshiji (Tochigi, JP)

Assignee: Fujinon Corporation

International Classification: G02B 5/30 (20060101); G02B 27/28 (20060101)

Expiration Date: 1/03/02017