Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-03-22
1996-05-07
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 41, G02F 11335
Patent
active
055151850
ABSTRACT:
A single panel type liquid crystal display projector includes a flat LCD panel oriented perpendicularly to a first optical axis, lighting means having an illumination source surrounded by a parabolic reflecting mirror for irradiating parallel light onto a rear side of the flat LCD panel, and an optical lens system for focusing, wherein the optical lens system is provided with a retrofocusing optical lens system which is located between the lighting means and the flat LCD panel, a flat reflecting mirror installed so as to be inclined with respect to the first optical axis at a predetermined angle of inclination, spaced apart by a predetermined distance from the LCD panel along the first optical axis so as to reflect light traveling along the first optical axis onto a second optical axis, and a focusing lens system composed of multiple lens groups arranged on the second optical axis and spaced apart by a predetermined distance from the intersection of the flat reflecting mirror and the first optical axis. The burden in manufacturing the lens necessitated by an upward projection produced in the conventional method is reduced and the overall size of the apparatus is miniaturized by reducing the length of the optical axis with an optical axis changeable system using a flat reflecting mirror, the manufacturing cost for the apparatus can be reduced.
REFERENCES:
patent: 4989954 (1991-02-01), Yokoyama et al.
patent: 5060058 (1991-10-01), Goldenberg et al.
patent: 5123729 (1992-06-01), Kondo et al.
patent: 5144462 (1992-09-01), Otsuka et al.
patent: 5172254 (1992-12-01), Atarashi et al.
Miller Charles
Samsung Aerospace Industries Ltd.
Sikes William L.
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