Attachment lens

Details Attachment lens Attachment lens

1999-06-24

2000-05-09

Epps, Georgia

Optical: systems and elements

Lens

385124, G02B 306, G02B 602

Patent

active

060611847

ABSTRACT:
An attachment lens is provided for an annular fiber optic illumination system which extends along a rotational axis for distributing the intensity of light beams emanating annularly from a light emanating surface of the fiber optic illumination system onto an object to be illuminated. The attachment lens comprises a ring-shaped optical element to be arranged concentrically with respect to the annular light beams and the rotational axis in a desired distance from the light emanating surface of the fiber optic illumination system. The ring-shaped optical element has a first rotationally symmetrical zone of a refractive power which increases towards the rotational axis for the annular light beams emanating from the fiber optic illumination system, and a second zone substantially for light beams which are aligned or parallel to said rotational axis. The second zone is adjacent the first zone and concentric to it and substantially free of any refractive power.

REFERENCES:
patent: 5329936 (1994-07-01), Lafferty
Applied Optics, vol. 23, No. 16, Aug. 15, 1984, pp 2670/71, "Illuminator for dark field . . ." Douglas S. Goodman.

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