Surface illuminator

Details Surface illuminator Surface illuminator

1978-03-06

1980-09-23

Haroian, Harry N.

Optics: image projectors

Structurally related projector and screen

Profile or silhouette

356391, 353 85, G03B 2124

Patent

active

042239869

ABSTRACT:
The light source comprises an elongate arc lamp surrounded by a paraboloidal reflector which, in one embodiment, projects an annular beam of light onto an annular reflector, or mirror, which in turn projects the light onto a workpiece. Reflected light from the workpiece is projected backwardly through an opening in the center of the mirror and is projected in known manner onto a viewing screen. In a second embodiment the mirror comprises a transparent member having a reflective spot (e.g., silver) in its center. In each embodiment a glass light filter is positioned between the light source and the associated mirror to filter out all but yellow and green light, and is inclined to the axis of the associated arc lamp to prevent direct reflection of ultraviolet light back at the lamp. The paraboloidal reflectors concentrate and direct collimated light toward the associated mirror thus eliminating need to employ separate collimating lenses and high wattage lamps.

REFERENCES:
patent: 2949057 (1960-08-01), Polidor
patent: 3143035 (1964-08-01), Morgan
patent: 3566101 (1971-02-01), Hagner
patent: 3806236 (1974-04-01), Downing
patent: 3827782 (1974-08-01), Boudouris et al.
patent: 3922085 (1975-11-01), Sheets

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