High efficiency fiber optics illuminator with thermally controll

Details High efficiency fiber optics illuminator with thermally controll High efficiency fiber optics illuminator with thermally controll

1991-04-08

1992-03-24

Lazarus, Ira S.

Illumination

Revolving

362294, 385 15, 385 53, 385133, F21V 704

Patent

active

050993992

ABSTRACT:
A fiber optics illuminator includes a source of illumination on an optical axis and an optical element coaxially disposed on the optical axis, forming an image of the illumination source at an image plane. A housing encloses the source of illumination, the optical element and the image plane. A thermal control bushing is disposed on the optical axis at an exit aperture in the housing and includes an elongated, generally cylindrical glass rod coaxially disposed on the optical axis, having a first end at the image plane of the optical element, receiving illumination and heat, and a second end external to the housing. The thermal control bushing includes a means for dissipating heat from the glass rod by radiation outside the housing and by convection aided by a ventilating fan. An elongated fiber optics light guide has a light receiving end coaxially disposed adjacent to the second end of the glass rod, and a remote light-emitting end. In a preferred embodiment the glass rod includes a series of conjugate refocus planes spaced from the image plane at its light receiving end, and has a length such that the illumination at its light emitting end is substantially out of focus adjacent to the fiber optics light guide.

REFERENCES:
patent: 3446952 (1969-05-01), Sitter et al.
patent: 3681592 (1972-08-01), Hugelshofer
patent: 3770338 (1973-11-01), Helmuth
patent: 4321659 (1982-03-01), Wheeler
patent: 4496211 (1985-01-01), Daniel
patent: 4704660 (1987-11-01), Robbins
patent: 4747660 (1988-05-01), Nishioko et al.
patent: 4786127 (1988-11-01), Molnar
patent: 4883333 (1989-11-01), Yanez
patent: 4922385 (1990-05-01), Awai
patent: 4986622 (1991-01-01), Martinez

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