Article and code engraving method
View Patent ↗An article allows an engraved code to be detected. The engraved code includes a plurality of dot dented portions defined on the article. Each of the dot dented portions has a quadrilateral pyramid shape with a coating layer on a prior stage dented portion having a quadrilateral pyramid shape. Corner dented portions dented at acute angles outward along a diagonal direction are defined at four corner positions of an opening peripheral edge portion of the prior stage dented portion.
1. An article comprising:
an engraved code including a plurality of dot dented portions,
wherein:
each of the plurality of dot dented portions is defined by coating a prior stage dented portion with a coating layer,
the prior stage dented portion includes a polygonal prior stage opening peripheral edge portion, and
a corner dented portion dented at an acute angle outward is defined at a corner position of the prior stage opening peripheral edge portion.
2. The article according to claim 1 , wherein:
the prior stage dented portion has a quadrilateral shape, and
the corner dented portion is dented at the acute angle outward along a diagonal direction of the prior stage opening peripheral edge portion.
3. The article according to claim 2 , wherein each of the plurality of dot dented portions has a quadrilateral pyramid shape including a quadrilateral opening peripheral edge portion with the coating layer defined on the prior stage dented portion having a quadrilateral pyramid shape including the prior stage opening peripheral edge portion.
4. The article according to claim 3 , wherein, for each of the plurality of dot dented portions, an angle defined by a wall surface of the dot dented portion and a surface orthogonal to a depth direction of the dot dented portion is 25 degrees or smaller.
5. The article according to claim 1 , wherein a bottom surface of the prior stage dented portion has a spherical shape.
6. The article according to claim 1 , wherein a thickness of the coating layer at the corner dented portion is thicker than another portion.
7. The article according to claim 1 , wherein the prior stage dented portion is defined by laser processing.
8. An article comprising:
a readout code including a plurality of dented dots defined on a surface of the article,
wherein:
an opening portion of each of the plurality of dented dots has a polygonal shape, and a corner of the opening portion includes a V-shaped corner protruding portion which protrudes at an acute angle outward in a diagonal direction, and
surface processing is performed on the plurality of dented dots.
9. An engraving method for engraving a readout code on an article, the engraving method comprising:
smoothing a surface of the article with laser light;
forming a plurality of dented dots as the readout code, on the surface of the article which has been smoothed, in a dented manner with laser light; and
performing surface processing on the readout code formed in the dented manner,
wherein an opening portion of each of the plurality of dented dots has a polygonal shape, and a corner of the opening portion includes a V-shaped corner protruding portion which protrudes at an acute angle outward in a diagonal direction.