Image projection apparatus and projection screen

Details Image projection apparatus and projection screen Image projection apparatus and projection screen

1995-01-27

1997-10-07

Malley, Daniel P.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

359453, 359460, G03B 2160

Patent

active

056754345

ABSTRACT:
An image projection apparatus of a rear projection type according to the present invention includes: a display portion having three image sources respectively displaying red, green, and blue images; a screen portion on which the red, green, and blue images are projected; and a projection member positioned between the display portion and the screen portion. The screen portion includes an optical member converting a plurality of light beams output from the display portion into a plurality of substantially collimated light beams, and a rear face and a front face provided at a predetermined interval. The rear face is positioned between the front face and the optical member, the rear face and the front face respectively having an array of cylindrical lenses, the optical axial plane of each cylindrical lens on the front screen face substantially coinciding with the optical axial plane of a corresponding cylindrical lens on the rear screen face. Each cylindrical lens on the front face outputs a light beam which is incident on the corresponding lens on the rear face obliquely to the optical axial plane at the same angle as that of a light beam which is incident on the plane parallel to the optical axial plane, on both sides of the optical axial plane.

REFERENCES:
patent: 4852981 (1989-08-01), Suda
patent: 5066099 (1991-11-01), Yoshida et al.
patent: 5076661 (1991-12-01), Bradley
patent: 5300942 (1994-04-01), Dolgoff
patent: 5400114 (1995-03-01), Yoshida et al.

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