Method and apparatus for optical inspection of transparent artic

Details Method and apparatus for optical inspection of transparent artic Method and apparatus for optical inspection of transparent artic

1985-01-15

1986-10-28

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250224, 356240, G01N 2190, G01N 2115

Patent

active

046200908

ABSTRACT:
A method and an apparatus for optical inspection of transparent articles. The method and apparatus use a light beam scanning field which is separated into at least two portions. The field portions are directed at the article at differing angles of incidence such that they eliminate blind spots caused by portions of the apparatus which block the passage of the light through the article. A feature of the invention is its provision of a folded optical path to increase the length the beam travels between the beam generator and the object beyond the physical distance between the beam generator and the object.

REFERENCES:
patent: 3338130 (1967-08-01), Gaffard
patent: 3361025 (1968-01-01), Gaffard
patent: 3410643 (1968-11-01), Jorgensen
patent: 3851975 (1974-12-01), Serret
patent: 3942001 (1976-03-01), O'Connor
patent: 3987301 (1976-10-01), O'Connor
patent: 3989387 (1976-11-01), Hategan
patent: 4293219 (1981-10-01), Ducloux
patent: 4368982 (1983-01-01), Van Arnam et al.

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