Light valve projector

Abstract

Abstract PURPOSE: To project incident light from a light source to a rectangular modulator and a projection lens as uniform illumination light by forming an incident aperture and a projection aperture of a non-imaging reflector respectively in rectangles having almost parallel edge parts and satisfying specific relational equations. CONSTITUTION: A converging optical system in the projecting device is provided with the non-imaging reflector 10 for converging light rays projected from a light source 2 through the incident aperture 12 having an incident angle 2θi in a large range and dimension Di and uniformly illuminating the projection aperture 20 having an outgoing angle 2θo in a small range and large dimension Do . The reflector 10 is constituted so as to have a composite parabolic reflector shape having two axes (x), (y) orthogonal to the optical axis 18 of the reflector 10 and satisfy relational equations I, II. Here, Dix and Diy are the dimension of the incident aperture 12, θix and θiy are maximum incident angles, Dox and Doy are the dimension of the projection aperture 20, θox and θoy are maximum out-going angles, and ni and no are respective refractive indexes of the apertures 12, 20. The edge parts of both the apertures 12, 20 are formed in parallel.

Inventors

• 👤 Arne L Duwaer
• 👤 アルネ・レックス・ドゥワエル
• 👤 Jill F Goldenberg
• 👤 ジル・フォーラー・ゴールデンベルグ

Bibliographic Details