Optics: image projectors – Composite projected image – Multicolor picture
Patent
1999-01-25
2000-11-21
Metjahic, Safet
Optics: image projectors
Composite projected image
Multicolor picture
353 34, 348744, 348750, 349 5, 349 8, 359629, 359637, G03B 2114
Patent
active
061492760
ABSTRACT:
There is provided an image projector including (a) a light source, (b) a reflection mirror for reflecting flux of light emitted from the light source, (c) an image display unit for forming images, and (d) a relay system for transferring the flux of light to the image display unit, the relay system including a relay lens having a first convex surface through which the flux of light enters therein and a second convex surface through which the flux of light exits therefrom, a ratio of a radius of curvature of the first convex surface to a radius of a curvature of the second convex surface being determined in such a manner that aberration out of an optical axis of the relay lens is increased to thereby cause a converging point of the flux of light to displace from a calculated focal distance. For instance, the ratio is determined in the range of about 1:2 to about 1:3. The relay lens preferably has a focal distance in the range of about 40 to 60 mm, and is made of material having an index of refraction in the range of about 1.5 to 1.65. The above-mentioned image projector increases aberration thereof. If a relay lens has greater aberration, a greater amount of flux of light is converged at a point spaced away from a focus in an optical axis of the relay lens. As a result, it is possible to compensate for non-uniformity in brightness, caused by dispersion in a converging point in a projection lens.
REFERENCES:
patent: 4943154 (1990-07-01), Miyatake et al.
patent: 5953152 (1999-09-01), Hewlett
Takeuchi Tadashi
Uchida Hiroshi
Leroux E P
Metjahic Safet
NEC Corporation
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