Optics: motion pictures – Special effects – Sets
Patent
1975-08-18
1977-04-19
Griffin, Donald A.
Optics: motion pictures
Special effects
Sets
353 28, 354110, 354126, A63J 500, G03B 2126, G03B 3500, G03B 1502
Patent
active
040185192
ABSTRACT:
A special polarizing beam splitting unit is employed in a composite photography system which utilizes an autocollimating screen having the capability of reflecting light with virtually no scatter or dispersion. A projector projects a background subject image onto the autocollimating screen, the image traversing first a path along an axis generally parallel to the plane of the autocollimating or projection screen and then by means of the polarizing beam splitting unit via a path extending along an axis normal to the plane of the projection screen. The subject is positioned between the polarizing beam splitting unit and the projection screen. A source of fill light is directed onto the subject through a washout suppression screen containing a polarizing filter oriented so that its plane of polarization is perpendicular to that of the polarization filter contained in the beam splitting unit. The suppression screen also includes an absorbing filter for attenuating visible blue light.
A camera is positioned so as to receive light that is reflected from both the autocollimating screen and the subject. The autocollimating or projection screen does not depolarize the light reflected therefrom, but the subject does so that only that portion of the reflected light residing in the plane of polarization passes through the polarizing beam splitting unit to the camera, thereby enabling the fill light to perform its intended purpose.
REFERENCES:
patent: 2336508 (1943-12-01), Smith et al.
patent: 2651233 (1953-09-01), Tondreau et al.
patent: 2727427 (1955-12-01), Jenkins
patent: 2727429 (1955-12-01), Jenkins
patent: 3277782 (1966-10-01), Smith
patent: 3305295 (1967-02-01), De Montremy
patent: 3322487 (1967-05-01), Renner
patent: 3588219 (1971-06-01), Lusted
British Journal of Photography, vol. 112, No. 5469, May 14, 1965, Transflex, pp. 407-409.
Griffin Donald A.
Peterson Stuart R.
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