Optical: systems and elements – Protection from moisture or foreign particle – Optical element rotates
Patent
1993-07-28
1995-03-28
Henry, Jon W.
Optical: systems and elements
Protection from moisture or foreign particle
Optical element rotates
152565, G02B 2700, F21V 3300
Patent
active
054022649
ABSTRACT:
An optical inspection system (10) has an inspection region (20) through which articles (12) pass and are illuminated by illumination (22) provided by an illumination source (30). The source is shielded from the inspection region by a protective shield or tube (32) transmissive of the illumination. A cleaning element (42), such as a plastic string, contacts a major surface (45) of the tube and dislodges contaminants (63) from the major surface as the tube rotates. The cleaning element has an active portion (60) held in contact with the major surface by tension in the cleaning element applied at tension locations (56, 58). The cleaning element describes part of a spiral or helix; it preferably occupies less than about 360 degrees, more preferably between about 30 and about 270 degrees, and still more preferably about 120 to about 240 degrees, of arc measured about the axis of the tube. The cleaning element flexes significantly under compression but remains taut under tension; it may be a monofilament or of woven construction; it has a maximum cross-sectional dimension D.sub.c that is much less than the maximum cross-sectional dimension D.sub.T of the tube.
REFERENCES:
patent: 3145249 (1964-08-01), Meltzer
patent: 3495366 (1970-02-01), Allen
patent: 4285090 (1981-08-01), Jurkowski
patent: 5068770 (1991-11-01), Baziuk
patent: 5161055 (1992-11-01), Blechschmidt
Key Technology, Inc., brochure entitled "ColorSort.RTM. II: A Profile in Productivity" (1991).
Gray Calvin G.
Wilbur John H.
Henry Jon W.
Simco/Ramic Corporation
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