Optics: image projectors – Distortion compensation
Patent
1991-12-27
1994-02-01
Cuchlinski, Jr., William A.
Optics: image projectors
Distortion compensation
353 37, 353 34, G03B 2100
Patent
active
052836029
ABSTRACT:
An optical system for a projector which is capable of compensating the keystoning. The system comprises a light source, a light condensing part, a projected object, an image projecting part for focusing and projecting the image on a screen, and an optical path diversifying mirror. The optical path diversifying mirror is arranged as inclined at 45.degree. angle of inclination with respect to the optical path of the light and also as being capable of parallel moving with the optical path toward or away from the projected object, thereby upwardly and downwardly projecting the image without occurrence of the keystoning on the screen. The present invention is applied for a three panel type of LCD projector comprising a plurality of projected objects, and an image projecting lens part for composing. The optical system of the LCD projector comprises at least one optical path diversifying mirror which is arranged in order to correspond to each projected object and also capable of moving in parallelism and also diversifying the optical path of the light. The optical system of this invention provides advantages in that it projects a clear image without occurrence of the keystoning on a screen disposed at a desired position regardless of the height of the projector and the screen.
REFERENCES:
patent: 3547530 (1970-12-01), Poole
patent: 4002408 (1977-01-01), Amma
patent: 4089599 (1978-05-01), Kuboshima
patent: 4846570 (1989-07-01), Kanai
patent: 4863263 (1989-09-01), Kanai
patent: 4864390 (1989-09-01), McKechnie et al.
patent: 4974958 (1990-12-01), Yoshida
Cuchlinski Jr. William A.
Dowling William C.
Goldstar Co. Ltd.
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