TAPERED MICRO-ELECTRONIC MICRO-CONNECTION DEEP-CAVITY WELDING CAPILLARY

Abstract

A micro-electronic micro-connection deep-cavity welding capillary, comprising a cylindrical capillary body, one end of the capillary body is a frustoconical welding end, a stepped unfilled corner on an end face of the welding end in the lengthwise direction, the remaining end face of the welding end is a welding end face, a spherical segment-shaped through groove in the welding end face, a columnar first wire threading hole facing the interior of the capillary body in the other end face of the capillary body in the lengthwise direction, a columnar second wire threading hole that is coaxial with the first wire threading hole in a first side surface, not adjacent to the welding end face, of the unfilled corner, and a transition hole that connects the first wire threading hole to the second wire threading hole and has an isosceles-trapezoid-like cross section inside the capillary body.

Claims

1. A tapered micro-electronic micro-connection deep-cavity welding capillary, comprising a cylindrical capillary main body, wherein an end of the capillary main body is a pyramid-shaped welding end, a stepped unfilled corner is defined on an end surface of the welding end in a length direction of the capillary main body, a remaining end surface of the welding end is a welding end surface, a spherical through hole is defined on the welding end surface, a length direction of the spherical through hole is consistent with a length direction of a corner edge of the unfilled corner, a columnar first wire threading hole facing an interior of the capillary main body is defined on another end surface of the capillary main body in the length direction of the capillary main body, a columnar second wire threading hole coaxial with the first wire threading hole is defined on a first side surface, not adjacent to the welding end surface, of the unfilled corner, a diameter and a depth of the second wire threading hole are respectively smaller than a diameter and a depth of the first wire threading hole, a transition hole connecting the first wire threading hole and the second wire threading hole and with an isosceles-trapezoid section is defined inside the capillary main body, one end of a long diameter of the transition hole is connected to one end of the first wire threading hole located inside the capillary, another end of a short diameter of the transition hole is connected to one end of the second wire threading hole located inside the capillary, an extended included angle between two waistlines of the transition hole is a, and a range of a is 20 degree<a<90 degrees.

2. The tapered micro-electronic micro-connection deep-cavity welding capillary according to claim 1, wherein a side surface, adjacent to the welding end surface, of the unfilled corner is a second side surface, a V-shaped through hole is defined on the welding end surface located between the spherical through hole and the unfilled corner, a length direction of the V-shaped through hole is consistent with the a length direction of the corner edge of the unfilled corner, a third wire threading hole extending to one side surface of the V-shaped through hole is obliquely defined on the second side surface, and a height of one end of the third wire threading hole located inside the V-shaped through hole is lower than a height of the spherical through hole.

3. The tapered micro-electronic micro-connection deep-cavity welding capillary according to claim 2, wherein a bell mouth is defined at an end of the third wire threading hole located on the second side surface in an axis direction of the third wire threading hole.

4. The tapered micro-electronic micro-connection deep-cavity welding capillary according to claim 2, wherein an inclined angle between a central axis of the third wire threading hole and the second side surface is 45 degrees.

5. The tapered micro-electronic micro-connection deep-cavity welding capillary according to claim 2, wherein a diameter ratio of the first wire threading hole to the second wire threading hole is 3:1, and a diameter ratio of the second wire threading hole and the third wire threading hole is 3:1.

6. The tapered micro-electronic micro-connection deep-cavity welding capillary according to claim 1, wherein a depth-to-diameter ratio of the first wire threading hole is 38:1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a schematic structural view of this embodiment; and

[0025] FIG. 2 is a partial enlarged view of FIG. 1.

REFERENCE NUMERALS IN THE DRAWINGS

[0026] 1 capillary main body; [0027] 11 first wire threading hole; [0028] 12 second wire threading hole; [0029] 13 third wire threading hole; [0030] 14 transition hole; [0031] 2 welding end; [0032] 211 first side surface; [0033] 212 second side surface; [0034] 221 spherical through hole; [0035] 222 V-shaped through hole.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The embodiments of the present application will be described in detail below with reference to the drawings.

Embodiment

[0037] As shown in FIG. 1 and FIG. 2, a tapered micro-electronic micro-connection deep-cavity welding capillary is provided, which includes a cylindrical capillary main body 1, an end of the capillary main body 1 is a pyramid-shaped welding end 2, a stepped unfilled corner is defined on an end surface of the welding end 2 in a length direction of the capillary main body 1, a remaining end surface of the welding end 2 is a welding end surface, a spherical through hole 221 is defined on the welding end surface, a length direction of the spherical through hole 221 is consistent with a length direction of a corner edge of the unfilled corner, and the spherical through hole 221 is configured to stably mount the gold wire after it is threaded out.

[0038] A columnar first wire threading hole 11 facing an interior of the capillary main body 1 is defined on another end surface of the capillary main body 1 in the length direction of the capillary main body 1. In addition, the welding end 2 described above forms a stepped unfilled corner. One side surface of the step is a first side surface 211, and another side surface of the step is a second side surface 212. A columnar second wire threading hole 12 coaxial with the first wire threading hole 11 is defined on the first side surface 211, not adjacent to the welding end surface, of the unfilled corner, and a diameter and a depth of the second wire threading hole 12 are respectively smaller than a diameter and a depth of the first wire threading hole 11. Due to the different diameters, a connection portion may form an inner wall on an edge of the first wire threading hole 11 to block the threading of the gold wire if the first wire threading hole 11 is directly connected to the second wire threading hole 12 inside the capillary main body 1, so a transition connection is required between the first wire threading hole 11 and the second wire threading hole 12.

[0039] A section of a transition hole is similar to a cone, a transition hole 14 connecting the first wire threading hole 11 and the second wire threading hole 12 and having an isosceles-trapezoid cross section is defined inside the capillary main body 1, one end of a long diameter of the transition hole 14 is connected to one end of the first wire threading hole 11 located inside the capillary, another end of a short diameter of the transition hole 14 is connected to one end of the second wire threading hole 12 located inside the capillary, an extended included angle between two waistlines of the transition hole 14 is a, and a range of a is 20 degree<a<90 degrees.

[0040] In one of the embodiments, if the gold wire is directly overlapped on the welding end surface around the unfilled corner after threading out, the part of the gold wire which is threaded out is all exposed to the outside of the capillary, and is not conducive to the protection of the gold wire. A side surface, adjacent to the welding end surface, of the unfilled corner is the second side surface 212, a V-shaped through hole 222 is defined on the welding end surface located between the spherical through hole 221 and the unfilled corner, a length direction of the V-shaped through hole 222 is consistent with a length direction of the corner edge of the unfilled corner, a third wire threading hole 13 extending to one side surface of the V-shaped through hole is obliquely defined on the second side surface 212, and a height of one end of the third wire threading hole 13 located inside the V-shaped through hole is lower than a height of the spherical through hole 221. The part of the gold wire which is threaded out is then threaded into the third wire threading hole 13 and threaded out of the V-shaped through hole 222. The V-shaped through hole 222 plays a certain protective role for the gold wire, and the gold wire bypasses two ends of the V-shaped through hole 222 and is overlapped on the spherical through hole 221.

[0041] In one of the embodiments, a bell mouth is defined at an end of the third wire threading hole 13 located on the second side surface 212 in an axis direction of the third wire threading hole 13, which reduces a bending degree of the gold wire, prevents the gold wire from breaking, and ensures the strength of the gold wire.

[0042] In one of the embodiments, an included angle between a central axis of the third wire threading hole 13 and the second side surface 212 is 45 degrees.

[0043] Further, a diameter ratio of the first wire threading hole 11 to the second wire threading hole 12 is 3:1, and a diameter ratio of the second wire threading hole 12 and the third wire threading hole 13 is 3:1, the first wire threading hole 11, the second wire threading hole 12 and the third wire threading hole 13 are stepped to form a guiding role on the gold wire.

[0044] Furthermore, a depth-to-diameter ratio of the first wire threading hole 11 is 38:1, and the depth-to-diameter ratio is the ratio of the depth to the diameter. The depth-to-diameter ratio is relatively large and the diameter is moderate, so as to avoid the bending and breaking of the gold wire as it encounters the burr in the hole. In addition, the hole is processed by electric spark to reach a higher accuracy.

[0045] Only some embodiments of the present application are described specifically and in detail in the above content, which should not be taken as limitation to the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all fall within the protection scope of the present application.