Fiber optic zoom-and-dim pin-spot luminaire

Details Fiber optic zoom-and-dim pin-spot luminaire Fiber optic zoom-and-dim pin-spot luminaire

1992-07-06

1993-12-07

Ullah, Akm E.

Optical waveguides

With optical coupler

Input/output coupler

362 32, 362336, G02B 600, G02B 636

Patent

active

052689778

ABSTRACT:
A fiber optic zoom-and-dim pins-pot luminaire includes a tubular housing having a proximal end and a distal end having a composite macro lens on an optical axis. A light emitter slidably disposed in a support tube at the proximal end of the housing is a fiber optic light guide having a first end accepting light from a remote source of illumination and a second emitting light on the optical axis. The composite macro lens forms a principal focus at a first focal plane to produce a narrow beam. The macro lens includes a plurality of micro lenses contiguous with portions of the macro lens, each micro lens having a focus at a second focal plane axially displaced from the principal focus of the macro lens. The luminaire is zoomed to a progressively wider beam of uniform intensity by moving the light emitter along the optical axis from the first focal plane, at which the second focal plane is out of focus; to the second focal plane, at which the first focal plane is out of focus. By retracting the light emitter into the support tube, the light may be dimmed at any position in the zoom range, or may be zoomed to another beam width at any desired brightness.

REFERENCES:
patent: 1495521 (1924-05-01), Kopp
patent: 2887568 (1959-05-01), Franck
patent: 4815807 (1989-03-01), Kaneko et al.
patent: 4821114 (1989-04-01), Gebhardt
patent: 4953549 (1990-09-01), Mori

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