The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 1998
Filed:
Jan. 10, 1997
Yoshiharu Ooi, Yokohama, JP;
Tsuneo Wakabayashi, Yokohama, JP;
Shigeyuki Serizawa, Yokohama, JP;
Yoshiyuki Sonda, Yokohama, JP;
AG Technology Co., Ltd., Yokohama, JP;
Abstract
A projection type display apparatus comprising a light source apparatus which is provided with an elliptic mirror 12, a light source 11 disposed at the first focal point, a cone-like material disposed at the second focal point, a condenser lens 13, display elements 15R-15B, a color separating and synthesizing optical system, second condenser lenses 16R-16B and a projection lens 19. The cone-like material is one selected from the group of a convex cone lens, a concave cone lens 2, a convex cone-like reflector and a concave cone-like reflector 20. In the projection type display element, light emitted from the light source is introduced into the cone-like material and is emitted as divergent light through the conical surface of the cone-like material. The divergent light is introduced into the condenser lens 13 so that the light is rendered to be parallel light fluxes, which are color-separated and introduced into the display elements 15R-15B disposed for each color in order to form light fluxes of display colors. The light fluxes are again subjected to color synthesization, and the synthesized light is projected as a full color picture image on a screen through the projection lens 19. The projection type display apparatus provides a display having uniformity, a good contrast ratio and brightness.