Projection type displaying apparatus and illumination system
First Claim
1. A projection type displaying apparatus, comprising:
- a light source;
optical modulating means;
projecting means for projecting an image generated by said optical modulating means on a screen; and
said screen;
wherein a center optical axis of rays of light projected by said projecting means are obliquely entered into said screen;
wherein said projecting means comprises;
first projecting optical means for converting an image generated by said optical modulating means into an intermediate image with trapezoidal distortion; and
second projecting optical means for converting said intermediate image with trapezoidal distortion into an image without trapezoidal distortion on said screen; and
wherein said first projecting optical means comprises two lenses which are not parallel to each other.
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Accused Products
Abstract
To provide an oblique projection type displaying apparatus for radiating rays of light which are nearly parallel with a light bulb, thereby preventing the brightness of a resultant image from becoming uneven, the apparatus comprises a light source, optical modulating means, projecting means for projecting an image generated by the optical modulating means on a screen, and the screen, wherein a center optical axis of rays of light projected by the projecting means are obliquely entered into the screen, wherein the projecting means comprises first projecting optical means for converting an image generated by the optical modulating means into an intermediate image with trapezoidal distortion, and second projecting optical means for converting the intermediate image with trapezoidal distortion into an image without trapezoidal distortion on the screen, and wherein the first projecting optical means comprises two lenses which are not parallel each other. In addition, the constructions of the light source, the reflection mirror for changing the optical path, and the screen are modified.
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Citations
22 Claims
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1. A projection type displaying apparatus, comprising:
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a light source; optical modulating means; projecting means for projecting an image generated by said optical modulating means on a screen; and said screen; wherein a center optical axis of rays of light projected by said projecting means are obliquely entered into said screen; wherein said projecting means comprises; first projecting optical means for converting an image generated by said optical modulating means into an intermediate image with trapezoidal distortion; and second projecting optical means for converting said intermediate image with trapezoidal distortion into an image without trapezoidal distortion on said screen; and wherein said first projecting optical means comprises two lenses which are not parallel to each other. - View Dependent Claims (2, 3, 7)
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4. A projection type displaying apparatus, comprising:
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a light source; optical modulating means; projecting means for projecting an image generated by said optical modulating means on a screen; and said screen; wherein a center optical axis of rays of light projected by said projecting means are obliquely entered into said screen; wherein said projecting means comprises; first projecting optical means for converting an image generated by said optical modulating means into an intermediate image with trapezoidal distortion; second projecting optical means for converting said intermediate image with trapezoidal distortion into an image without trapezoidal distortion on said screen; and an aperture stop mechanism for performing an optical adjustment, that is, for improving the quality of an image; and wherein said first projecting optical means comprises at least one set of two lenses which are not parallel to each other, said aperture stop mechanism being disposed in projecting optical means. - View Dependent Claims (5, 6)
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8. A projection type displaying apparatus, comprising:
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optical modulating means; projecting means for projecting an image generated by said optical modulating means on a screen; a reflection mirror for reflecting rays of light projected by said projecting means to said screen; wherein said reflecting mirror includes a plurality of successive elements in the path of the rays of light, the last of said elements of said reflection mirror being disposed parallel to said screen; and wherein a center optical axis of the rays of light projected by said projecting means has an incident angle α
to said screen, the incident angle α
being 60°
or more.
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9. An illumination system having a lighting unit, said lighting unit comprising a lamp, a reflector for reflecting, at an exit side of the reflector, a beam of light rays having a width greater than that of the reflector, and a light transmitting optical element arranged on the exit side of the reflector and having a face with a wall thickness which is gradually reduced at restricted sides of the beam, so that the light rays of the beam reflected by the reflector have a substantially even distribution.
- 10. An illumination system comprising a lamp, a reflector and a light transmitting optical device disposed on an exit side of the reflector, said optical device having a conical surface to produce a distribution of light rays in a beam reflected by the reflector which is substantially even.
- 16. An illumination system comprising a lamp, a reflector, and a light transmitting optical element disposed at an exit side of the reflector for displacing rays of light reflected by the reflector at sides thereof towards a central part of the rays of light, and for displacing rays of light at said central part towards said sides.
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21. An illumination system comprising a lamp, a reflector, and a plurality of light transmitting optical elements disposed on an exit side of the reflector for condensing rays of light reflected by the reflector, one of said light transmitting optical elements including two conical optical members, a first of which is convex, and a second of which is concave.
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22. An illumination system comprising a lamp, a reflector, and a light transmitting optical element disposed on an exit side of said reflector for condensing rays of light reflected by the reflector, said optical element comprising a conical member having one face of convex shape and an opposite face of concave shape.
Specification