Optics: image projectors – Unitary plural refracting surfaces
Reexamination Certificate
1998-08-14
2001-02-06
Dowling, William (Department: 2851)
Optics: image projectors
Unitary plural refracting surfaces
C353S034000
Reexamination Certificate
active
06183094
ABSTRACT:
This application is based on the application No. 9-226365 filed in Japan, the content of which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to an illuminating apparatus and to a light projecting apparatus suitable for an image projecting device such as a liquid crystal projector.
2. Description of the Related Art
Conventionally, in a liquid crystal projector that projects images formed on liquid crystal panels, it is desirable for the illuminating apparatus that illuminates the liquid crystal panels to concentrate the light from the light source onto the liquid crystal panels to the extent possible, so that the light from the light source may be used as efficiently as possible.
However, in order to deal with variation in the accuracy of the component parts, it is necessary for an illuminating apparatus to illuminate an area slightly larger than the liquid crystal panel. This extra use of light reduces the efficiency in the use of the light from the light source.
In addition, to make it lightweight and for ease in mass production, a formed resin product is generally used for the housing that contains the illuminating optical system. As a result, in order to alter the positions of the liquid crystal panels and mirrors mounted in the housing, the mold must be changed, which is costly and time-consuming.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an improved illuminating apparatus and light projecting optical apparatus.
Another object of the present invention is to provide an illuminating apparatus and light projecting optical apparatus that can concentrate the light from the light source on the illumination object to the extent possible.
These objects are attained by means of an illuminating apparatus having a construction comprising a light source emitting a light, an optical integrator including a first lens array and a second lens array, a dividing optical system dividing the light emitting from the light source into three wavelength ranges, three panels having formed images thereon such that the formed images correspond to the divided lights, a composition optical system composing three image lights from the formed images on the panels, an optical element provided between the light source and the panel and transmitting a light ray emitted from the light source, and a projection optical system projecting the composed image light, wherein the optical element is movably supported in order to adjust a position of an illumination light on the illumination object.
The invention itself, together with further objects and attendant advantages, will be understood by reference to the following detailed description taken in conjunction with the accompanying drawings.
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Dowling William
Minolta Co. , Ltd.
Sidley & Austin
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