Phasenkontrastausgleichselement und Projektorartige Bildprojektionsvorrichtung

Details

Veröffentlichungs-Nr.

EP2985641

Aktenzeichen

EP14782780

Anmeldetag

9. April 2014

Veröffentlichung

23. März 2022

Erteilung

23. März 2022

Rechtsraum

EP

IPC

G02B5/30G02B1/11G02F1/13G02F1/1335G02F1/13363G03B21/00G03B21/14H04N9/31

Abstract

A phase difference compensating element that can effectively compensate polarization disturbance, and a projection-type image projecting device are provided. The phase difference compensating element includes: a birefringent layer (33) formed with a film stack of obliquely-deposited films, each of the obliquely-deposited films having a thickness equal to or smaller than the used wavelength; and an Rd-AR film (32) that is formed with a film stack of two or more kinds of dielectric films having different refractive indexes, and provides an arbitrary phase difference to a phase difference in obliquely-incident transmitted light in the birefringent layer (33). The phase difference Rd to be provided by the Rd-AR film (32) satisfies 1 < Rd(»)/Rd(»') < 1.5 (» < »'), at an arbitrary wavelength » in the used wavelength band and within an incident light angle range of 0 to 25 degrees.

Anmelder

Firma

Dexerials Corporation

Land

🇯🇵 Japan

Fachgebiete