Abstract A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system, and requires less space to mount. Rays of light emitted from a light valve of the projector are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays pass through the projection lens, are reflected by the parabolic mirror and then are brought to a parallel beam of light that is further collected by a Fresnel lens to finally form an image on a lenticular lens-screen.
A projector, comprising: an elliptical mirror having a primary focal point and a secondary focal point; a light valve emitting rays of light converging into the primary focal point of the elliptical mirror through an optical system; a projection lens disposed at the secondary focal point of the elliptical mirror; and a parabolic mirror having its focal point at the secondary focal point of the elliptical mirror so as to produce a parallel beam of light, whereby the rays of the parallel beam of light reflected by the parabolic mirror are collected to form an image.
Claim 2
Dependent Claim
96 words
A projector, comprising: an elliptical mirror having a primary focal point and a secondary focal point; a light valve emitting rays of light converging into the primary focal point of the elliptical mirror through an optical system; a projection lens disposed at the secondary focal point of the elliptical mirror; and a parabolic mirror having its focal point at the secondary focal point of the elliptical mirror so as to produce a parallel beam of light, whereby the rays of the parallel beam of light reflected by the parabolic mirror are collected to form an image.
Claim 3
Dependent Claim
23 words
The projector of 1, further comprising a light source and a beam spitter, wherein the light valve is a reflection type liquid-crystal display.
Claim 4
Dependent Claim
23 words
The projector of 1, further comprising a light source and a beam spitter, wherein the light valve is a reflection type liquid-crystal display.