Variable beam width lighting device

Details Variable beam width lighting device Variable beam width lighting device

1986-03-10

1988-03-01

Dolinar, Andrew M.

Illumination

Light source and modifier

Adjustable or repositionable light source or light source...

362263, 362306, 362350, F21V 722, F21P 300

Patent

active

047290773

ABSTRACT:
A variable beam width lighting device including a luminaire assembly having a luminaire fixture to which are operatively mounted a reflector and a lamp and to which is operatively supplied electrical power to produce a light beam. An adjustable lamp positioning means is mounted between the lamp and the luminaire fixture. The adjustable lamp positioning means is responsive to a power means to move the lamp relative to the reflector to vary the width of the light beam between a narrow beam and a wide beam according to choice. The reflecting properties of the reflector are varied to produce smooth transition characteristics when the beam width is changed.

REFERENCES:
patent: 1313739 (1919-08-01), Ryerson
patent: 1512158 (1924-10-01), Bragg et al.
patent: 2109056 (1938-02-01), Bardwell et al.
patent: 4423471 (1983-12-01), Gordin et al.
patent: 4602321 (1986-07-01), Bornhorst

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