Laser scanning apparatus using a fan style grating plate
AssigneeMinnesota Mining and Manufacturing Company
InventorCharles C. Lee
Life of this patent
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Abstract
A laser scanner apparatus using a laser reference beam that is directed to and scans a grating plate which is used for producing a data clock for the apparatus. The grating plate has a line grating formed by a plurality of lines that are equally spaced along the scan of the grating plate by the laser reference beam. The plurality of lines, if extended, intersect at a single point. The grating plate can have more than one such line grating.
Claims5
A grating plate having a line grating, the line grating including a set of a plurality of lines defined relative to a reference line wherein said plurality of lines intersect with the reference line at equally spaced points along such reference line, all of said plurality of lines, if extended, intersecting at a single point and a line that is orthogonal to said reference line and spaced at a distance from said set that is greater than the distance between two adjacent lines of said set measured along said reference line.
A laser scanner apparatus including:
- a grating plate having a line grating, the line grating including a set of a plurality of lines defined relative to a reference line wherein said plurality of lines intersect with the reference line at equally spaced points along such reference line, all that is of said plurality of lines, if extended, intersecting at a single point and a line orthogonal to said reference line and spaced at a distance from said set that is greater than the distance between two adjacent lines of said set measured along said reference line;
- a laser for providing a reference laser beam;
- and
- means for directing said reference laser beam to said lens grating for movement along a line parallel to said reference line.
Dependencies are inferred from the claim text.