Ultrasonic transducer

Abstract

The utility model discloses an ultrasonic transducer. The ultrasonic transducer is composed of an amplitude-change pole and a piezoelectric vibrator. The half part of the amplitude-change pole is provided with a chopper hole for mounting a chopper, a jackscrew hole for mounting a jackscrew to lock the chopper, and a wire passing hole; a mounting ring is arranged in the middle of the amplitude-change pole; the tail part of the amplitude-change pole is connected with the piezoelectric vibrator; meanwhile, the back of the chopper hole is provided with the retreat groove, so that the chopper is subjected to three-side force from the front end and the two rear side ends in the chopper hole of the transducer, and the chopper is fixed more stably.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of ultrasonic transducers, and is mainly used to improve the bonding wire quality of the same kind of ultrasonic transducers used in the industry. BACKGROUND

[0002] Bonding wire machines are widely used in the semiconductor packaging industry. With the development of the semiconductor packaging industry, new requirements for bonding wire quality are constantly being made in the industry. SUMMARY

[0003] The present invention discloses an ultrasonic transducer with a retreat groove on the back of the cleaver hole.

[0004] A widely used ultrasonic transducer for bonding wire machines is composed of a horn and a piezoelectric vibrator; the front part of the horn has a cleaver hole for installing a cleaver, a top wire hole for installing a top wire to lock the cleaver, and a wire passing hole; the middle part of the horn has a fixing ring for fixing the entire transducer; the tail part of the horn is connected with the piezoelectric vibrator. The cleaver is in the cleaver hole of the horn and is subjected to forces from two directions: one from the top wire and one from the back arc surface of the cleaver hole. Since the cleaver hole is larger than the cleaver, the cleaver is not directly constrained on both sides. In this way, when the transducer is working, due to ultrasonic vibration, the cleaver may slightly swing left and right in the cleaver hole due to the weak constraint on both sides, and this uncontrolled swing is amplified through the long cleaver, affecting the bonding wire quality.

[0005] The present invention sets a retreat groove on the back of the cleaver hole, so that the force originally received by the cleaver from the back becomes two forces on both sides of the back. In this way, the cleaver is subjected to a total force from three basically uniformly distributed directions in the cleaver hole, and is fixed more stably, improving the bonding wire quality. BRIEF DESCRIPTION OF DRAWINGS

[0006] The present invention will be further described below in conjunction with the drawings and examples.

[0007] Figure 1 Figure 1 is a schematic diagram of an existing ultrasonic transducer for a bonding wire machine in the industry.

[0008] Figure 2 Figure 3 is a schematic diagram of the force on the cleaver after the retreat groove is set on the back of the cleaver hole in the present invention.

[0009] Figure 3 Figure 4 is a schematic diagram of the horn in an embodiment of the present invention.

[0010] Figure 4 Figure 5 is a schematic diagram of the horn in another embodiment of the present invention.

[0011] Wherein: 1, amplitude rod, 2, piezoelectric vibrator, 3, chisel, 4, top wire, 11, amplitude rod front, 12, fixed ring, 13, amplitude rod rear, 111, chisel hole, 112, wire hole, 113, top wire mounting hole, 115, top wire thread bottom hole root hole, 116, retreat groove, f1, chisel force received by top wire, f2 and f3, chisel force received from the side rear close to the retreat groove on both sides. DETAILED DESCRIPTION

[0012] Figure 1 A schematic diagram of an ultrasonic transducer used in a wire bonding machine in the prior art. It consists of an amplitude rod 1 and a piezoelectric vibrator 2; the amplitude rod front 11 has a chisel hole 111 for installing a chisel 3, a top wire hole 113 for installing a top wire 4 to lock the chisel 3, and a wire hole 12; the amplitude rod middle has a fixed ring 12 to fix the entire transducer; the amplitude rod back 13 is connected with the piezoelectric vibrator 2. The chisel is in the chisel hole of the amplitude rod, and is subjected to forces from two directions: one from the top wire, and one from the back of the chisel hole.

[0013] The present application directly sets a retreat groove 116 on the back of the existing chisel hole, so that the force received by the chisel in the chisel hole is changed from the original two directions to three directions. The three forces are shown by the three thick arrows f1, f2, f3 in Figure 2 .

[0014] Figure 3 An embodiment of the present application is shown in the schematic diagram.

[0015] Figure 4 Another embodiment of the present application is shown in the schematic diagram. In this embodiment, in order to facilitate the machining of the top wire hole of the amplitude rod, when machining the thread hole of the top wire, the bottom hole is deep into the back of the chisel hole, and there is a top wire thread bottom hole root hole 115, which is perpendicular to the retreat groove.

Claims

1. An ultrasonic transducer, the transducer consisting of a horn and a piezoelectric vibrator, characterized in that: The amplitude lever has a chisel hole for installing a chisel, a top screw hole for installing a top screw to lock the chisel, and a wire passing hole; the middle part of the amplitude lever has a fixing ring; the tail part of the amplitude lever is connected with a piezoelectric vibrator; and the back part of the chisel hole is provided with a retreat groove.

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