Projector apparatus

Details Projector apparatus Projector apparatus

1999-07-19

2000-10-24

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

359618, 359619, 353 22, 353 31, 349 5, 349 7, G02B 2710

Patent

active

061376353

ABSTRACT:
To correct on-axis chromatic aberration of a projection lens easily and at low cost by using a transparent plate between an optical modulator for a primary color component and a beam combining optical system. When a standard projection lens 11 having a medium focal length is used, parallel-plane glass plates 27, 28, and 29 of the same thickness (1 mm for example) may be inserted in each component beam. However, when the projection lens is changed to one having a different focal length, at least one of the parallel-plane glass plates is replaced in order to suppress the occurrence of on-axis chromatic aberration for that color component caused by the change in focal length.

REFERENCES:
patent: 4043641 (1977-08-01), Gottlieb
patent: 4909601 (1990-03-01), Yajima et al.
patent: 5353156 (1994-10-01), Chung
patent: 5757505 (1998-05-01), Mizutani
patent: 5967635 (1999-10-01), Tani et al.

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