Optical inspection apparatus

Details Optical inspection apparatus Optical inspection apparatus

1991-05-10

1993-06-08

Ben, Loha

Optical: systems and elements

Lens

With viewed object or viewed field illumination

359800, 356391, G02B 2702

Patent

active

052184811

ABSTRACT:
An optical projection system for projecting a magnified image of an object includes a 1:2 relay lens having a magnification of .times.0.5. The object is illuminated by a collimated substantially parallel light beam from a source and the 1:2 relay lens produces an intermediate shadow image at its focal plane. A projection lens is located to project a magnified final image of the intermediate image on the screen. While it is preferred that the relay lens has a magnification of .times.0.5, the relay lens may have a different magnification less than .times.1.

REFERENCES:
patent: 2552238 (1951-05-01), Turner et al.
patent: 2552272 (1951-05-01), Fultz
patent: 2776696 (1957-01-01), Meier
patent: 3539798 (1970-11-01), Perry
patent: 3917391 (1975-11-01), Padula et al.

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