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US 6,322,958 B1Granted
Laser marking method and apparatus, and marked member
AssigneeSumitomo Heavy Industries, Ltd.
InventorKenichi Hayashi
Life of this patent
Estimating the term…
Abstract
A laser beam is radiated from a laser source. The laser beam radiated from the laser source is converged at a converging point inside of a work member to form cracks at the converging point and in its nearby area, by making a cross section of the laser beam at the converging point have a shape long in a first direction perpendicular to an optical axis of the laser beam. Markers easy to increase contrast can be formed in the work member.
Claims10
A marking method comprising the steps of:
- radiating a laser beam from a laser source;
- and
- converging the laser beam radiated from the laser source at a converging point inside of a work member to form cracks at the converging point and in its nearby area, by making a cross section of the laser beam at the converging point have a shape long in a first direction perpendicular to an optical axis of the laser beam.
A marking apparatus comprising:
- a laser source for radiating a laser beam;
- a beam shaper for shaping a shape of a cross section of the laser beam radiated from said laser source so as to make the cross section have a shape long in a first direction perpendicular to an optical axis of the laser beam;
- a converging lens for converging the laser beam shaped by said beam shaper;
- and
- a holder for holding a work member so as to set a converging point of the laser beam converged by said converging lens to a position inside of the work member.
2 more elements
A marked member comprising:
- a transparent member;
- and
- markers formed in said transparent member, each of said markers including a linear portion having optical characteristics different from a nearby region and a pair of areal cracks extending from the linear portion in opposite directions.
Dependencies are inferred from the claim text.