Oblique led illuminator device

Details Oblique led illuminator device Oblique led illuminator device

1997-12-09

1999-04-27

Quach, Y.

Illumination

Work-table lighting system

362246, 362800, F21V 500

Patent

active

058971955

ABSTRACT:
The illuminator has a cylindrical or truncated-conical array of LEd's producing collimated light beams that are directed onto axially-spaced, inclined surfaces formed on the outer periphery of a hollow, similarly shaped (i.e., cylindrical or truncated-conically shaped) Fresnel-like diffuser which refracts and directs rings of light beams onto the surface of a workpiece at angles of incidence ranging anywhere from 15.degree. to 80.degree.. The array of LED's surrounds the associated Fresnel-like diffuser coaxially thereof, and in turn is surrounded by a circuit board which supplies power selectively to illuminate LED's in the array thereof. The Fresnel-like diffusers have in the outer peripheral surfaces thereof circumferential grooves forming on their outer surfaces annular, prism-shaped projections which differ in shape depending upon the desired angle of incidence of the light beams that are to be projected thereby onto a workpiece.

REFERENCES:
patent: 4893223 (1990-01-01), Arnold
patent: 5690417 (1997-11-01), Polidor et al.

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