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US 7,597,231 B2Granted
Wire bonding capillary tool having multiple outer steps
AssigneeSmall Precision Tools, Inc.
InventorJaime Castaneda
Life of this patent
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Abstract
A bonding tool for bonding a fine wire to a substrate, said bonding tool comprising an at least substantially cylindrical portion having a concentric capillary therein through which the fine wire runs; a working tip portion formed at an end of the cylindrical portion being tapered towards the tip thereof, said working tip portion having an annular chamfer at the tip thereof; wherein the concentric capillary opens into the annular chamfer of the working tip, and wherein the diameter of the cylindrical portion decreases consecutively at a plurality of discrete intervals along the length of the cylindrical portion towards the working tip portion.
Claims26
A bonding tool for bonding a fine wire to a substrate, said bonding tool comprising:
- a first substantially cylindrical portion having a first latitudinal cross-sectional average width and a length, wherein the first latitudinal cross-sectional average width is substantially constant along the length of the first substantially cylindrical portion;
- a second substantially cylindrical portion adjacent to the first substantially cylindrical portion and having a second latitudinal cross-sectional average width and a length, wherein the second latitudinal cross-sectional average width is substantially constant along the length of the second substantially cylindrical portion, and the second latitudinal cross-sectional average width is smaller than the first latitudinal cross-sectional average width;
- a third cylindrical portion adjacent to the second substantially cylindrical portion and having a third latitudinal cross-sectional average width and a length, wherein the third latitudinal cross-sectional average width is substantially constant along the length of the third cylindrical portion, and the third latitudinal cross-sectional average width is smaller than the second latitudinal cross-sectional average width;
- and
- a working tip portion having a length and a width adjacent to an end of the third substantially cylindrical portion and being tapered toward a tip of the working tip portion, said working tip portion having an annular chamfer at the tip thereof;
- wherein each of the first, second, and third substantially cylindrical portion defines therein a concentric capillary through which the fine wire runs;
- wherein the concentric capillary opens into the annular chamfer of the working tip;
- and
- wherein the first substantially cylindrical portion transitions to the second substantially cylindrical portion at a first discrete interval, and the second substantially cylindrical portion transitions to the third substantially cylindrical portion at a second discrete interval alone a length of the bonding tool.
6 more elements
A bonding device for forming a metallurgical bond between a fine wire to a substrate, said bonding device comprising:
- (i) a bonding tool for bonding a fine wire to a substrate, said bonding tool comprising:
- a first substantially cylindrical portion having a first latitudinal cross-sectional average width and a length, wherein the first latitudinal cross-sectional average width is substantially constant along the length of the first substantially cylindrical portion;
- a second substantially cylindrical portion adjacent to the first substantially cylindrical portion and having a second latitudinal cross-sectional average width and a length, wherein the second latitudinal cross-sectional average width is substantially constant along the length of the second substantially cylindrical portion, and the second latitudinal cross-sectional average width is smaller than the first latitudinal cross-sectional average width;
- a third cylindrical portion adjacent to the second substantially cylindrical portion and having a third latitudinal cross-sectional average width and a length, wherein the third latitudinal cross-sectional average width is substantially constant along the length of the third cylindrical portion, and the third latitudinal cross-sectional average width is smaller than the second latitudinal cross-sectional average width;
- and
- a working tip portion having a length and a width adjacent to an end of the third substantially cylindrical portion and being tapered toward a tip of the working tip portion, said working tip portion having an annular chamfer at the tip thereof;
- wherein each of the first, second, and third substantially cylindrical portion defines therein a concentric capillary through which the fine wire runs;
- wherein the concentric capillary opens into the annular chamfer of the working tip;
- and
- wherein the first substantially cylindrical portion transitions to the second substantially cylindrical portion at a first discrete interval, and the second substantially cylindrical portion transitions to the third substantially cylindrical portion at a second discrete interval along a length of the bonding tool;
- and
- (ii) a nano-scale ultrasonic energy source connected to said bonding tool to transmit ultrasonic energy to the bonding tool.
9 more elements
Dependencies are inferred from the claim text.