Multi-directional surface illuminator

Details Multi-directional surface illuminator Multi-directional surface illuminator

1984-02-27

1986-01-28

Walsh, Donald P.

Illumination

Supports

Magnetic

362 32, 362 33, 362 97, 362140, 362235, 362268, 362305, 362367, 350525, 354 79, G02B 2110

Patent

active

045675511

ABSTRACT:
An annular Fresnel lens surrounds a tubular barrel or sleeve containing an objective lens system, which is focussed on an object that is positioned a predetermined distance beyond one end of the barrel. Four independently operable light sources are arranged in equi-angularly spaced relation around the outside of the lens barrel to direct light onto each of four mirrors, which are mounted in intersecting planes around the outside of the lens barrel to reflect light in four quadrants onto the side of the Fresnel lens remote from said object. The Fresnel lens focuses light from the mirrors obliquely onto the object, an image of which is thus projected by the objective lens through the lens barrel toward, for example, a video sensor, which forms part of a video inspection machine.

REFERENCES:
patent: Re22848 (1947-03-01), Wilder
patent: 3064523 (1962-11-01), Meltzer
patent: 3433940 (1969-03-01), Baez
patent: 4006487 (1977-02-01), Allen
patent: 4475796 (1984-10-01), Kimura

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