Reflector for uniformly illuminating an area, particularly a fil

Details Reflector for uniformly illuminating an area, particularly a fil Reflector for uniformly illuminating an area, particularly a fil

1981-06-19

1983-11-22

Walsh, Donald P.

Illumination

Light source and modifier

Including reflector

362297, 362346, 362347, 362348, 362350, F21V 700

Patent

active

044173008

ABSTRACT:
To provide for essentially uniform illumination throughout the area, for mple the film window of a film or slide projector, the reflector has at least two contours which form a reflector system, each contour being rotation-symmetrical with respect to the optical axis of the total system. The generatrices of the contours follow conical sections. The reflector is divided into zonal regions, with successive zonal regions lying on different contours. For example, two conical contours can be used, the contour of one conical section being such that spot illumination results, and the contour of the other conical section being such that a saddle-tight illumination is obtained so that the overall light output throughout the window is essentially uniform (see the additive of FIGS. 3a and 3b, as shown in FIG. 3c).

REFERENCES:
patent: 4208704 (1980-06-01), Draper
patent: 4218727 (1980-08-01), Shemitz
patent: 4351018 (1982-09-01), Fratty

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