LED illuminating device for providing a uniform light spot

Details LED illuminating device for providing a uniform light spot LED illuminating device for providing a uniform light spot

1997-12-23

2000-03-07

Tso, Laura K.

Illumination

Plural light sources

With modifier

362 19, 362 33, 362231, 362800, F21V 502

Patent

active

060330872

ABSTRACT:
An illuminating device including a cylindrical main body that is provided with a circularly arranged plurality of LEDs of different colors so as to be used in, for instance, an optical inspection apparatus. The illuminating device further includes a light diffusing element, light-condensing lens and a polarizing element or a prism having polarizing surfaces, which are all installed inside the cylindrical main body. The LED lights are corrected in intensity to be even by the light-diffusing element, pass through the light-condensing lens and further pass through the prism so as to be directed toward a single point and form a superimposed light illuminating an object, thus a CCD camera that is provided in the center of the cylindrical main body can take an image of the object.

REFERENCES:
patent: 4947291 (1990-08-01), McDermott
patent: 5039832 (1991-08-01), Polacek et al.
patent: 5400229 (1995-03-01), Lin
patent: 5580163 (1996-12-01), Johnson, II
patent: 5685637 (1997-11-01), Chapman et al.
patent: 5690417 (1997-11-01), Polidor et al.

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