RIBBON BONDING TOOLS AND METHODS OF USING THE SAME
A ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion includes a working surface between a front edge of the tip portion and a back edge of the tip portion. The working surface includes a region defining at least one of a plurality of recesses and a plurality of protrusions. The working surface also defines at least one of (1) a first planar portion between the region and the front edge of the tip portion, and (2) a second planar portion between the region and the back edge of the tip portion.
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This application claims the benefit of International Patent Application No. PCT/US2010/023273 filed Feb. 5, 2010, which claims the benefit of U.S. Provisional Application Nos. 61/150,633; 61/150,596; 61/150,611; 61/150,625; 61/150,579; and 61/150,640, each of which was filed Feb. 6, 2009, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTIONThe present invention relates to bonding tools used in ribbon bonding systems, and more particularly, to improved tip portions of ribbon bonding tools.
BACKGROUND OF THE INVENTIONIn the processing and packaging of semiconductor devices, wire bonding continues to be a primary method of providing electrical interconnection between two locations within a package (e.g., between a die pad of a semiconductor die and a lead of a leadframe). To form wire loops to provide this interconnection, bonding tools (e.g., capillary tools used during ball bonding, wedge tools used in wedge bonding) are used to press a wire against a bonding location using ultrasonic, thermosonic, or thermocompressive energy.
In the assembly of certain devices (e.g., power semiconductor devices) ribbon bonding may be used to provide electrical interconnection between locations. For example, U.S. Patent Application Publication Nos. 2006/0163315 (entitled Ribbon Bonding Tool and Process) and 2007/0141755 (entitled Ribbon Bonding in an Electronic Package) relate to ribbon bonding and are incorporated herein by reference.
Various of the drawings disclosed herein (e.g.,
Certain ribbon bonding tools have features formed on the working surface such as those shown in U.S. Patent Application Publication No. 2006/0163315 entitled Ribbon Bonding Tool and Process.
Thus, it would be desirable to provide improved ribbon bonding tools.
SUMMARY OF THE INVENTIONAccording to an exemplary embodiment of the invention, a ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion includes a working surface between a front edge of the tip portion and a back edge of the tip portion. The working surface includes a region defining at least one of a plurality of recesses and a plurality of protrusions. The working surface also defines at least one of (1) a first planar portion between the region and the front edge of the tip portion, and (2) a second planar portion between the region and the back edge of the tip portion.
According to another exemplary embodiment of the present invention, a ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion includes a working surface between a front edge of the tip portion and a back edge of the tip portion. The working surface defines a plurality of recesses, wherein a portion of the recesses defined by the working surface adjacent at least one of the front edge and the back edge are deeper than others of the recesses.
According to another exemplary embodiment of the present invention, a ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion includes a working surface, wherein during engagement with a transducer of a ribbon bonding system, the working surface extends lower in a center region than (1) at a first surface region extending from a first edge of the working surface toward the center region, and (2) at a region extending from a second edge of the working surface toward the center region, a length of the first surface region being at least 25% of a length of the working surface from the first edge to the second edge, a length of the second surface region being at least 25% of a length of the working surface from the first edge to the second edge.
According to another exemplary embodiment of the present invention, a ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion including a working surface. The tip portion includes two side wall portions on either side of the working surface wherein a ribbon path is defined between the side wall portions.
According to another exemplary embodiment of the present invention, a ribbon bonding tool including a body portion is provided. The body portion includes a tip portion. The tip portion includes a working surface. The tip portion includes two side wall portions extending along an exterior surface of at least a portion of a back side of the ribbon bonding tool wherein a ribbon path is defined between the side wall portions.
The inventive ribbon bonding tools may also be integrated into inventive ribbon bonding systems including various elements such as bond head elements (e.g., ultrasonic transducers, ribbon cutter, ribbon material guides), as well as other elements.
Further, the invention may also be considered in connection with methods of forming ribbon loops. Such methods may include a step of forming a ribbon bond of a ribbon loop on a first bonding location, extending the ribbon material toward a second bonding location, forming another ribbon bond on the second bonding location, and separating the now completed ribbon loop from the ribbon supply (using a ribbon cutter, if desired, to assist in the separation). Such a method is accomplished using an inventive ribbon bonding tool (and other elements of a ribbon bonding system) according to the exemplary embodiments disclosed herein.
The invention is best understood from the following detailed description when read in connection with the accompanying drawing. It is emphasized that, according to common practice, the various features of the drawing are not to scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity. Included in the drawing are the following figures:
According to certain exemplary embodiments of the present invention, the working surface (also known as a “foot”) of a ribbon bonding tool includes a region defining at least one of a plurality of recesses and a plurality of protrusions (such as in a waffle or grid pattern). The working surface also defines at least one planar portion, along at least one edge of the working surface.
In the configuration shown in
Referring now to
The features on the working surface are not limited to protrusions, but may include recesses, or both recesses and protrusions.
While
While the groove plane GP is illustrated as curving along the front to back direction (i.e., from the front edge of the working surface to the back edge of the working surface), the groove plane GP could extend from one side edge of the working surface to the other side edge of the working surface. Further, the working surface of the ribbon bonding tool could have a curved (or varying depth) groove plane that extends in both the front to back direction (as in
While FIGS. 9A and 10A-10C illustrate ribbon bonding tools including a curved groove plane, the bottom surface of the tool continues to be substantially flat (i.e., extending along plane “BSP” shown in
Referring to
Although
Although
As illustrated in
Referring specifically to
Referring specifically to
The various exemplary ribbon bonding tools disclosed herein may have varying characteristics. For example, while certain of the drawings disclose the working surface as being substantially planar (e.g.,
Various embodiments of the present invention include features on or adjacent the working surface of a ribbon bonding tool including, for example, protrusions/teeth, recesses/grooves, rounded edges, side walls portions, amongst others. Such features may be formed by various methods (e.g., using computer control) including, for example, laser-machining, fluid-jet milling, direct molding, mechanical grinding, or EDM (electrical discharge machining).
Although the present invention includes the aforementioned features (e.g., protrusions/teeth, recesses/grooves, rounded edges, side walls portions) having exemplary shapes/dimensions, it is understood that alternative shapes/dimensions are contemplated.
Although the invention is illustrated and described herein with reference to specific embodiments, the invention is not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope and range of equivalents of the claims and without departing from the invention.
Claims
1. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface between a front edge of the tip portion and a back edge of the tip portion, the working surface including a region defining at least one of a plurality of recesses and a plurality of protrusions, the working surface also defining at least one of (1) a first planar portion between the region and the front edge of the tip portion, and (2) a second planar portion between the region and the back edge of the tip portion.
2. The ribbon bonding tool of claim 1 wherein the working surface defines both the first planar portion and the second planar portion.
3. The ribbon bonding tool of claim 2 wherein the working surface also defines (1) a third planar portion between the region and a first side of the tip portion, and (2) a fourth planar portion between the region and a second side of the tip portion.
4. The ribbon bonding tool of claim 1 wherein the region defining at least one of a plurality of recesses and a plurality of protrusions is a waffle or a grid pattern of protrusions and recesses.
5. The ribbon bonding tool of claim 4 wherein the protrusions have rounded edges.
6. The ribbon bonding tool of claim 1 wherein the region defines a plurality of protrusions extending above a planar surface of the working surface.
7. The ribbon bonding tool of claim 6 wherein the plurality of protrusions are round.
8. The ribbon bonding tool of claim 6 wherein the plurality of protrusions are rectangular.
9. The ribbon bonding tool of claim 6 wherein the plurality of protrusions are diamond shaped.
10. The ribbon bonding tool of claim 6 wherein the plurality of protrusions are arranged in at least one row.
11. The ribbon bonding tool of claim 6 wherein the plurality of protrusions are arranged in at least two rows.
12. The ribbon bonding tool of claim 6 wherein the plurality of protrusions include rounded edges.
13. The ribbon bonding tool of claim 1 wherein the region defines a plurality of recesses extending below a planar surface of the working surface.
14. The ribbon bonding tool of claim 13 wherein the plurality of recesses are round.
15. The ribbon bonding tool of claim 13 wherein the plurality of recesses are rectangular.
16. The ribbon bonding tool of claim 13 wherein the plurality of recesses are diamond shaped.
17. The ribbon bonding tool of claim 13 wherein the plurality of recesses are arranged in at least one row.
18. The ribbon bonding tool of claim 13 wherein the plurality of recesses are arranged in at least two rows.
19. The ribbon bonding tool of claim 1, wherein a length of the working surface is defined between the front edge and the back edge, and wherein the first planar portion extends along between 5-40 percent of the length.
20. The ribbon bonding tool of claim 1, wherein a length of the working surface is defined between the front edge and the back edge, and wherein the second planar portion extends along between 5-40 percent of the length.
21. The ribbon bonding tool of claim 1, wherein a length of the working surface is defined between the front edge and the back edge, and wherein each of the first planar portion and the second planar portion extends along between 5-40 percent of the length.
22. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool Including a body portion including a tip portion, the tip portion including a working surface between a front edge of the tip portion and a back edge of the tip portion, the working surface including a region defining at least one of a plurality of recesses and a plurality of protrusions, the working surface also defining at least one of (1) a first planar portion between the region and the front edge of the tip portion, and (2) a second planar portion between the region and the back edge of the tip portion.
23. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface between a front edge of the tip portion and a back edge of the tip portion, the working surface defining a plurality of recesses, wherein a portion of the recesses defined by the working surface adjacent at least one of the front edge and the back edge are deeper than others of the recesses.
24. The ribbon bonding tool of claim 23 wherein a portion of the recesses defined by the working surface adjacent both the front edge and the back edge are deeper than others of the recesses.
25. The ribbon bonding tool of claim 24 wherein a depth of the plurality of recesses follows a profile such that a depth of the recesses is shallower at a central portion of the working surface, and increases toward the front and the back edges.
26. The ribbon bonding tool of claim 25 wherein the profile is a curved profile.
27. The ribbon bonding tool of claim 25 wherein a depth of the plurality of recesses follows another profile such that a depth of the recesses is shallower at a central portion of the working surface, and increases toward side edges of the working surface.
28. The ribbon bonding tool of claim 27 wherein the profile, and the another profile, are curved profiles.
29. The ribbon bonding tool of claim 24 wherein a depth of the plurality of recesses follows a profile such that a depth of the recesses is shallower at a central portion of the working surface, and increases in each direction extending toward a periphery of the working surface.
30. The ribbon bonding tool of claim 29 wherein the profile is a curved profile.
31. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool including a body portion including a tip portion, the tip portion including a working surface between a front edge of the tip portion and a back edge of the tip portion, the working surface defining a plurality of recesses and a plurality of protrusions, wherein a portion of the recesses adjacent at least one of the front edge and the back edge are deeper than others of the recesses.
32. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface, at least a portion of the working surface following a curved path, the portion including an area of the working surface extending away from a first edge of the working surface, the portion also including an area of the working surface extending away from a second edge of the working surface, the portion of the working surface following the curved path includes at least 50% of a length between the first edge and the second edge.
33. The ribbon bonding tool of claim 32 wherein the portion of the working surface following the curved path includes an entire length between the first edge and the second edge.
34. The ribbon bonding tool of claim 33 wherein the first edge is a front edge and a second edge is the back edge.
35. The ribbon bonding tool of claim 33 wherein the first edge is a first side edge and the second edge is a second side edge.
36. The ribbon bonding tool of claim 32 wherein the first edge is a front edge and a second edge is the back edge.
37. The ribbon bonding tool of claim 32 wherein the first edge is a first side edge and the second edge is a second side edge.
38. The ribbon bonding tool of claim 32 for use in an ultrasonic system wherein the curved path is defined by a radius extending from (1) a location of the ribbon bonding tool that coincides with a first vibrational node of the ribbon bonding tool in the ultrasonic system to (2) the working surface.
39. The ribbon bonding tool of claim 38 wherein the radius is between 2-15 mm.
40. The ribbon bonding tool of claim 38 wherein the radius is between 2-10 mm.
41. The ribbon bonding tool of claim 38 wherein the radius is between 3-5 mm.
42. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool including a body portion including a tip portion, the tip portion including a working surface, at least a portion of the working surface following a curved path, the portion including an area of the working surface extending away from a first edge of the working surface, the portion also including an area of the working surface extending away from a second edge of the working surface, the portion of the working surface following the curved path includes at least 50% of a length between the first edge and the second edge.
43. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface, wherein during engagement with a transducer of a ribbon bonding system, the working surface extends lower in a center region than (1) at a first surface region extending from a first edge of the working surface toward the center region, and (2) at a region extending from a second edge of the working surface toward the center region, a length of the first surface region being at least 25% of a length of the working surface from the first edge to the second edge, a length of the second surface region being at least 25% of a length of the working surface from the first edge to the second edge.
44. The ribbon bonding tool of claim 43 wherein the first surface region is chamfered in a direction from the first edge toward the center region, and the second surface region is chamfered in a direction from the second edge toward the center region.
45. The ribbon bonding tool of claim 43 wherein the first surface region is curved in a direction from the first edge toward the center region, and the second surface region is curved in a direction from the second edge toward the center region.
46. The ribbon bonding tool of claim 43 wherein the first edge is a front edge and a second edge is the back edge.
47. The ribbon bonding tool of claim 43 wherein the first edge is a first side edge and the second edge is a second side edge.
48. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool including a body portion including a tip portion, the tip portion including a working surface, wherein during engagement with a transducer of a ribbon bonding system, the working surface extends lower in a center region than (1) at a first surface region extending from a first edge of the working surface toward the center region, and (2) at a region extending from a second edge of the working surface toward the center region, a length of the first surface region being at least 25% of a length of the working surface from the first edge to the second edge, a length of the second surface region being at least 25% of a length of the working surface from the first edge to the second edge.
49. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface, the tip portion including two side wall portions on either side of the working surface wherein a ribbon path is defined between the side wall portions.
50. The ribbon bonding tool of claim 49 wherein the side wall portions are tapered such that the ribbon path is larger at a bottom edge of the tool than it is at the working surface.
51. The ribbon bonding tool of claim 49 wherein the side wall portions are curved such that the ribbon path is larger at a bottom edge of the tool than it is at the working surface.
52. The ribbon bonding tool of claim 49 wherein the side wall portions are chamfered such that the ribbon path is larger at a bottom edge of the tool than it is at the working surface.
53. The ribbon bonding tool of claim 49 wherein the two side wall portions extend at least partially along a back side of the ribbon bonding tool such that the ribbon path is defined along a portion of the back side of the ribbon bonding tool and along the working surface.
54. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool including a body portion including a tip portion, the tip portion including a working surface, the tip portion including two side wall portions on either side of the working surface wherein a ribbon path is defined between the side wall portions.
55. A ribbon bonding tool comprising:
- a body portion including a tip portion,
- the tip portion including a working surface, the tip portion including two side wall portions extending along an exterior surface of at least a portion of a back side of the ribbon bonding tool wherein a ribbon path is defined between the side wall portions.
56. The ribbon bonding tool of claim 55 wherein the side wall portions are tapered such that the ribbon path is smaller at an interior surface of the ribbon path than at an outer edge of the ribbon path defined between the two side wall portions.
57. The ribbon bonding tool of claim 55 wherein the side wall portions are curved such that the ribbon path is smaller at an interior surface of the ribbon path than at an outer edge of the ribbon path defined between the two side wall portions.
58. The ribbon bonding tool of claim 55 wherein the side wall portions are chamfered such that the ribbon path is smaller at an interior surface of the ribbon path than at an outer edge of the ribbon path defined between the two side wall portions.
59. The ribbon bonding tool of claim 55 wherein the two side wall portions extend at least partially along a bottom edge of the ribbon bonding tool such that the ribbon path is defined along at least a portion of the back side of the ribbon bonding tool and along at least a portion of the bottom edge.
60. A ribbon bonding system comprising:
- a transducer; and
- a ribbon bonding tool supported by the transducer, the ribbon bonding tool including a body portion including a tip portion, the tip portion including a working surface, the tip portion including two side wall portions extending along an exterior surface of at least a portion of a back side of the ribbon bonding tool wherein a ribbon path is defined between the side wall portions.
Type: Application
Filed: Feb 5, 2010
Publication Date: Dec 1, 2011
Applicant: ORTHODYNE ELECTRONICS CORPORATION (Irvine, CA)
Inventors: Mark A. Delsman (Irvine, CA), Theodore J. Copperthite (Laguna Hills, CA), Garrett W. Jones (Newport Beach, CA), Todd J. Walker (Lake Forrest, CA), Tick-Kwang Loh (Irvine, CA), Jay C. McCandless (Irvine, CA)
Application Number: 13/145,676
International Classification: B23K 3/00 (20060101);