A light width controller is disclosed including a light width controlling mirror of a refractive index n2, the mirror having: a first surface of an angle a1 with respect to horizontal; a second surface of a different angle a2 with respect to horizontal; and a reflection layer for reflecting light incident on the second surface. The first and second surfaces are not parallel. Light that has passed through a medium of a refractive index of n1 smaller than n2 and then has passed through the first surface is incident upon, and then reflected from, the second surface. Also, an image projector utilizing such a light width controller is disclosed.
A projection optical system includes a light source emitting light, a light valve with a surface in front of the light source, and a wedge prism disposed in the optical path from the light source to the light valve. By means of the wedge prism with different sectional thickness, the optical path and focus position of the light beam can be corrected. Therefore, the distortion produced by oblique incidence on to the light valve can be improved such that the light optical focus on the surface of the light valve to achieve the improvement of light spot on light valve and raise the uniformity, collection efficiency, and brightness.
A light source unit includes: a plurality of light sources that provide light beams; and an optical-path changing section that outputs the light beams emitted from the light sources such that the light beams are substantially parallel to one another and the distance therebetween are smaller than the distance at entering from the light sources, thereby changing the optical path of the light beams.
An improved optical apparatus for an LCD projector capable of more effectively focussing a light on an LCD panel of a high vision or a wide vision, and achieving a desired wave length and a better contrast of a picture, which includes a second polarizing unit for separating a green component from the visible ray transmitted from the white light source, for polarizing the green component into a P-wave component light, and for evenly transmitting on an LCD panel having a 16:9 format display ratio by correcting a brightness non-uniformity of the P-wave component light; a third polarizing unit for separating a blue component from the visible ray transmitted from the white light source, for polarizing the blue component into a P-wave component light, and for evenly transmitting on an LCD panel having a 16:9 format display ratio by correcting a brightness non-uniformity of the P-wave component light; a color mixer for the red, green, and blue components which are obtained by the first through third polarizing units; and a projection lens for projecting the thusly mixed color rays on a screen.
An optical illumination system and an image projection system including the same include a light source, at least one illuminating lens and a Mangin mirror that illuminate light emitted from the light source on a predetermined reflective device, the Mangin mirror including a concave refracting surface that refracts and transmits light incident from the illuminating lens, and a convex reflecting surface disposed behind the concave refracting surface to internally reflect the light refracted by the concave refracting surface back toward the concave refracting surface and tilted with respect to the illuminating lenses. The light reflected from the convex reflecting surface and then refracted through the concave refracting surface propagates along a path that is different from a path of the light emitted from the illuminating lens.
