Video projecting apparatus

Details Video projecting apparatus Video projecting apparatus

1978-08-25

1980-03-18

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 931

Patent

active

041942167

ABSTRACT:
An apparatus for projecting a compound video image onto a screen generally includes a plurality of image sources, such as cathode ray tubes, each forming a respective primary color image, and a plurality of lenses projecting the images from the image sources onto the screen to form a compound image. The projecting lenses are arranged so that the principal axes thereof are parallel to one another and arranged in a substantially symmetrical manner with respect to the center of the screen. Each of the color image sources includes an imaginary central axis normal to the plane of the image formed by the respective cathode ray tube, with each of the central axes being epaxially displaced from the principal axes of the respective projecting lenses and at least one of the imaginary central axes being outwardly inclined in respect to the principal axis of the respective projecting lens, with the degree of such inclination being determined in correspondence with the refractive index of the transparent material of the face plate of the respective cathode ray tube for the color of the respective color image.

REFERENCES:
patent: 4087835 (1978-05-01), Nishimura et al.

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