SECOND SURFACE LASER ABLATION
First Claim
Patent Images
1. A method comprising:
- providing a workpiece comprising a substrate, a coating layer disposed over a first surface of the substrate, and a mask disposed over a second surface of the substrate; and
removing a portion of the coating layer from the workpiece by directing a laser beam at the workpiece such that the laser beam passes through the substrate from the second surface to the first surface before the laser beam impinges on the coating layer;
wherein the first surface of the substrate and the second surface of the substrate are opposite surfaces of the substrate, and the mask selectively prevents removal of the coating layer from portions of the workpiece.
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Abstract
A method of removing material from an opposite side of workpiece includes directing a laser beam at a first side of the workpiece to remove the material from an opposite second side of the workpiece.
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Citations
36 Claims
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1. A method comprising:
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providing a workpiece comprising a substrate, a coating layer disposed over a first surface of the substrate, and a mask disposed over a second surface of the substrate; and removing a portion of the coating layer from the workpiece by directing a laser beam at the workpiece such that the laser beam passes through the substrate from the second surface to the first surface before the laser beam impinges on the coating layer; wherein the first surface of the substrate and the second surface of the substrate are opposite surfaces of the substrate, and the mask selectively prevents removal of the coating layer from portions of the workpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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providing a workpiece comprising a substrate and a coating layer disposed over a first surface of the substrate; and removing a portion of the coating layer from the workpiece by directing a laser beam at the workpiece such that the laser beam passes through the substrate before the laser beam impinges on the coating layer; wherein the laser beam is produced by a laser with a pulse duration in a range of 0.5 to 500 femtoseconds. - View Dependent Claims (24)
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25. A product comprising:
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a substrate; a coating layer disposed over a first surface of the substrate; and a portion of the first surface of the substrate that is substantially free of the coating layer; wherein an edge of the coating layer adjacent the portion of the first surface of the substrate that is substantially free of the coating layer forms an average angle with the first substrate surface in a range of 30°
to 120°
, the edge of the coating layer adjacent the portion of the first surface of the substrate that is substantially free of the coating layer has a characteristic length, L, that is a length of the portion of the edge of the coating layer in which a thickness of the coating layer tapers from a nominal coating layer thickness, t, to zero thickness, and L≦
100 μ
m. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A vehicle rearview mirror assembly comprising a product comprising:
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a substrate; a coating layer disposed over a first surface of the substrate; and a portion of the first surface of the substrate that is substantially free of the coating layer; wherein an edge of the coating layer adjacent the portion of the first surface of the substrate that is substantially free of the coating layer forms an average angle with the first substrate surface in a range of 30°
to 120°
, the edge of the coating layer adjacent the portion of the first surface of the substrate that is substantially free of the coating layer has a characteristic length, L, that is a length of the portion of the edge of the coating layer in which a thickness of the coating layer tapers from a nominal coating layer thickness, t, to zero thickness, and L≦
100 μ
m.
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Specification