BONDING TOOL AND METHOD FOR PRODUCING A BONDING TOOL

Abstract

A production method for a bonding tool with a body that has an elongated tool shank of the bonding tool and a tool tip adjoining the tool shank, and with a blind hole that is provided in the region of an elongated tool shank of the bonding tool and that is carried into the region of a tool tip, wherein a contact surface of the bonding tool is provided on the tool tip, comprising the following production steps: first a through opening is produced that is carried through the tool shank to the tool tip; then the through opening is closed in the region of the tool tip by a terminating element inserted into the body.

Claims

1. A production method for a bonding tool comprising a body that has an elongated tool shank of the bonding tool and a tool tip adjoining the tool shank, and comprising a blind hole that is provided in a region of an elongated tool shank of the bonding tool and that is carried into a region of a tool tip, wherein a contact surface of the bonding tool is provided on the tool tip, the method comprising: producing a through opening that is carried through the tool shank to the tool tip; and closing the through opening in the region of the tool tip by a terminating element inserted into the body.

2. The production method according to claim 1, wherein the terminating element is inserted into the through opening.

3. The production method according to claim 1, wherein a lateral opening that intersects the through opening is produced in the bonding tool, and wherein the terminating element is introduced into the lateral opening.

4. The production method according to claim 1, wherein the terminating element is produced oversize with respect to a cross-section of the through opening or the lateral opening, and then is inserted into the through opening or into the lateral opening such that a press fit is formed after the joining.

5. The production method according to claim 1, wherein a thread is produced on at least sections of the through opening and/or the lateral opening, and wherein a setscrew is screwed into the thread as a terminating element.

6. The production method according to claim 1, wherein a contact geometry that has the contact surface is produced on the bonding tool in the region of the tool tip, wherein the tool tip and the terminating element inserted into the bonding tool are shaped for this purpose.

7. The production method according to claim 6, wherein the contact geometry is produced on the tool tip after the terminating element is inserted into the bonding tool.

8. A bonding tool, in particular for an ultrasonic laser bonding device, the bonding tool comprising: a body extending in a longitudinal direction of the bonding tool having a tool shank and a tool tip that adjoins the tool shank; a contact surface provided on the tool tip on an end face facing away from the tool shank; a longitudinal opening designed in the manner of a blind hole is provided on the bonding tool, the longitudinal opening longitudinally extending in a region of the tool shank and which is carried into the region of the tool tip; and a through opening, provided to form the blind hole in the bonding tool, is closed by a terminating element provided in the region of the tool tip.

9. The bonding tool according to claim 8, wherein a contact geometry on which the contact surface is formed is implemented on the tool tip, and wherein the terminating element provides at least a part of the contact geometry.

10. The bonding tool according to claim 8, wherein the terminating element is designed to be rotationally symmetric with respect to a terminating element longitudinal axis.

11. The bonding tool according to claim 8, wherein the terminating element longitudinal axis of the terminating element intersects a longitudinal axis of the through opening and/or is orthogonal and/or coaxial to the same.

12. The bonding tool according to claim 8, wherein a setscrew is provided as the terminating element, and wherein the setscrew is screwed into a thread provided in the through opening and/or in a lateral opening that intersects the through opening.

13. The bonding tool according to claim 8, wherein a locating edge for the terminating element is provided on the through opening or on the lateral opening against which locating edge the terminating element is placed.

14. The bonding tool according to claim 8, wherein an assembly bevel is implemented on the terminating element, and/or wherein the terminating element forms a blind hole bottom of the blind hole, and/or wherein the terminating element has an opening which the laser beam enters.

15. The bonding tool according to claim 8, wherein the blind hole extends in the longitudinal direction of the bonding tool, and/or wherein the blind hole has a constant cross-section and/or a circular cross-section in the longitudinal direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:

[0035] FIG. 1 shows a first production step for a bonding tool according to the invention in a sectional representation,

[0036] FIG. 2 shows the fully produced bonding tool from FIG. 1 in a sectional representation,

[0037] FIG. 3 shows a bonding tool according to the invention in a sectional representation,

[0038] FIG. 4 shows a sectional representation of a body of the bonding tool according to the invention,

[0039] FIG. 5 shows the fully produced bonding tool from FIG. 4 with a terminating element inserted into the body,

[0040] FIG. 6 shows a bonding tool according to the invention in a sectional representation,

[0041] FIG. 7 shows a bonding tool according to the invention in a sectional representation,

[0042] FIG. 8 shows a bonding tool according to the invention in a sectional representation, and

[0043] FIG. 9 shows a bonding tool according to the invention with a lateral opening provided in the region of a tool tip and with the terminating element inserted into the lateral opening, in a sectional representation.

DETAILED DESCRIPTION

[0044] A bonding tool according to FIGS. 1 and 2 includes a body produced as a single piece having an elongated tool shank 1 and a tool tip 2 that adjoins the tool shank 1 at its end, as well as a terminating element 4. Provided on the body is a longitudinal opening implemented as a blind hole 3.2 that extends through the tool shank 1 to the region of the tool tip 2. The blind hole 3.2 is produced by the means that a through hole 3.1 is initially produced, which is then closed by the terminating element 4. To this end, the terminating element 4 is inserted into the through opening 3.1 in the region of the tool tip 2. By way of example, in this case the terminating element 4 is designed to be rotationally symmetric with respect to a terminating element longitudinal axis 7 of the same, and the terminating element longitudinal axis 7 of the terminating element 4 in the installed state is oriented coaxially to a longitudinal axis 8 of the through opening 3.1 or of the blind hole 3.2, respectively.

[0045] The tool tip 2 of the bonding tool is geometrically determined by a wedge-shaped tapering outer geometry of the bonding tool. The wedge-shaped geometry of the bonding tool is frequently used for ultrasonic bonding tools, for example.

[0046] To join the terminating element 4 to the body of the bonding tool, the terminating element 4 can be cooled to a low temperature and then inserted into the through opening 3.1 to form the blind hole 3.2, for example. In this regard, a press fit or force fit is formed after the joining, which is to say after the insertion of the terminating element 4 and the equalization of the temperatures of the terminating element 4 and the body of the bonding tool. The terminating element 4 is frictionally retained in the region of the tool tip 2 in this regard.

[0047] A contact surface 5 of the bonding tool is provided on an end face in the region of the tool tip 2. The terminating element 4 closes the through opening 3.1 in the region of the contact surface 5. An end face of the terminating element 4 forms a part of the contact surface 5 of the bonding tool in this regard.

[0048] According to an alternative embodiment of the invention from FIG. 3, a contact geometry 9 that has the contact surface 5 is provided on the bonding tool on an end face provided in the region of the tool tip 2. The contact geometry 9 is wedge-shaped in design. It serves to guide a bond wire that is to be integrally joined with an electrically conductive contact partner in the region of the tool tip 2 during the bonding process or to guarantee an exact position of the bond wire during the bonding. The contact geometry 9 is implemented such that a part thereof is formed by the body, and another part thereof is formed by the terminating element 4. The contact surface 5 is formed partly on the body and partly on the terminating element 4 of the bonding tool in this regard.

[0049] The terminating element 4 according to the second embodiment of the invention can, as stated above, be inserted into the through opening 3.1 flush with an end face of the body. The terminating geometry can then be produced on the bonding tool after insertion of the terminating element 4. For example, the terminating element 4 can be inserted into the through opening 3.1 such that it is recessed from the end face of the bonding tool to produce the blind hole 3.2. In this design, an installation dimension for the terminating element 4 is determined such that a continuous contact surface 5 is the result after production of the contact geometry 9.

[0050] Alternatively, a contact geometry 9 with a discontinuous or interrupted contact surface 5 can be produced by inserting the terminating element 4 into the through opening 3.1 deeply enough that the terminating element 4 is processed only locally at its end face when the contact geometry 9 is produced.

[0051] According to a third embodiment of the invention from FIG. 4 and FIG. 5, the contact geometry 9 can be produced on the body of the bonding tool that has the through opening 3.1 before the terminating element 4 is inserted into the through opening 3.1 to produce the blind hole 3.2. In this regard, the terminating element 4 is inserted into the through opening 3.1 after the contact geometry 9 is produced, and is positioned there such that an end face of the terminating element 4 that faces the tool-tip-side end face is located above the contact geometry 9 with respect to the depicted orientation of the bonding tool.

[0052] According to a fourth embodiment of the invention shown in FIG. 6, an assembly bevel 11 is provided on the terminating element 4. Due to the provision of the assembly bevel 11, the terminating element 4 can be inserted into the through opening 3.1 to produce the blind hole 3.2 of the bonding tool in an especially simple manner. In this regard, the assembly bevel 11 is provided on an end face of the terminating element 4 that faces away from the contact geometry 9 or the contact surface 5 in the assembled state of the bonding tool, and the terminating element 4 is inserted into the body of the bonding tool through an aperture of the through opening 3.1 that is provided in the region of the contact surface 5 or the contact geometry 9. At the same time, the assembly bevel 11, which forms the bottom of the blind hole or a part thereof, can deflect a laser beam that is guided in the blind hole 3.2 in the direction of an internal lateral surface of the blind hole 3.2, and thus facilitate targeted heating of the bonding tool in the region of the tool tip 2.

[0053] According to a fifth embodiment of the invention shown in FIG. 7, provision is made that the through opening 3.1 has a cross-sectional transition in the region of the tool tip 2, and that a locating edge 10 for the terminating element 4 is formed by the cross-sectional transition. The terminating element 4 has a maximum outer diameter that is precisely tailored to the largest inner diameter of the through opening 3.1, taking into account the joint dimensions of a press fit. Furthermore, the terminating element 4 tapers toward the assembly bevel 11. In this regard, the terminating element 4 can be inserted into the through opening 3.1 precisely to the locating edge 10. Thus, in the assembled state the terminating element 4 rests against the locating edge 10 and consequently always has an exactly defined position with respect to the body of the bonding tool.

[0054] According to a sixth embodiment of the invention from FIG. 8, the locating edge 10, which is produced on the body of the bonding tool, is designed to be oblique with respect to the longitudinal axis 8 of the blind hole 3.2 or of the through opening 3.1. In a corresponding manner, a contact bevel is formed on the terminating element 4 with which the terminating element 4 is placed against the locating edge 10 formed on the body. In this regard, an exact positioning of the terminating element 4 in the through opening 3.1 is also guaranteed according to the sixth exemplary embodiment of the invention. In addition, the contact bevel serves as an assembly bevel 11 for the terminating element 4.

[0055] According to an alternative embodiment of the invention from FIG. 9, a lateral opening 6, which intersects the through opening 3.1 extending in the longitudinal direction of the body, is provided on the body of the bonding tool in the region of the tool tip. The terminating element 4 is then provided in the lateral opening 6. The terminating element 4 is inserted into the lateral opening 6 in such a manner, and a cross-section of the lateral opening 6 is dimensioned in such a mannerwith respect to a cross-section of the through opening 3.1that the terminating element 4 completely closes the through opening 3.1 to form the blind hole 3.2. Consequently, herein contrast to the abovementioned exemplary embodiments of the inventionan additional opening is provided in the bonding tool, and the terminating element 4 is inserted into the additional opening to close the through opening 3.1. The terminating element 4 has an assembly bevel 11 as explained above.

[0056] As stated above, a press fit or force fit can always be formed between the body and the terminating element 4 to frictionally secure the terminating element 4. Alternatively, provision can be made that the terminating element 4 is adhesive-bonded or otherwise integrally fixed in the through opening 3.1 or the lateral opening 6, for example. Likewise, provision can be made that a thread is formed on at least portions of the region of the lateral opening 6 or of the through opening 3.1, and that a setscrew (headless screw) is screwed into the thread as the terminating element 4 to close the through opening 3.1 and to form the blind hole 3.2.

[0057] The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.