Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Reflector
Patent
1989-10-10
1991-02-12
Wieder, Kenneth
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Reflector
313114, 362297, 362346, H01J 516
Patent
active
049926950
ABSTRACT:
A parabolic reflector differs from a standard paraboloid configuration by defining a relatively small, reflective cone on its reflective surface which is axially aligned with the longitudinal axis of the parabolic reflector. The reflective surface of the cone in any cross section taken through the conical axis and is so contoured that light impinging from a light source disposed forwardly of the reflector on the longitudinal axis thereof will strike the concave reflective surface of the cone, and reflect against the main parabolic reflecting dish, where it is re-reflected forwardly and parallel, thus eliminating the light from the lamp passing close to the longitudinal axis which would otherwise reflect back through the lamp rather than alongside it. This reflector is designed for use with high power HMI lamps from 1200 to 18 kw which are used for motion picture and television set lighting. Cone angle is from 15 degrees to 45 degrees maximum.
REFERENCES:
patent: 2799791 (1957-07-01), Honing et al.
Branscomb Ralph S.
Wieder Kenneth
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