Chip picking head

Abstract

The invention provides a chip picking head which comprises a base, a vacuum suction head penetrating into the base, a lifting driving device and a rotating driving device. The vacuum suction head comprises an air guide rod, a suction nozzle connected to the bottom of the air guide rod, and an air suction device connected to the top of the air guide rod. The lifting driving device comprises a cylinder. The cylinder comprises a piston rod which can stretch out downwards and abut against the vacuum suction head to drive the air guide rod to move down. The rotating driving device can drive the airguide rod to rotate so as to drive the suction nozzle to rotate. By controlling the air pressure of the cylinder, the press-down force of the suction nozzle is controlled, compared with a mode of controlling the press-down force of the suction nozzle through a motor, the precision is higher, errors are lower, the press-down force of the suction nozzle can be better controlled, and chips are prevented from damage. By driving the suction nozzle to rotate through the rotating driving device, the control over the rotating angle of the chips can be realized, the chips can be better aligned with bonding pads on circuit boards, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of chip manufacturing, in particular to a chip pick-up head. Background technique [0002] Die pickup head is a precision instrument for transferring chips, used to pick up chips from tapes and attach them to circuit boards. When the pick-up head attaches the chip to the circuit board, there will be a pressing force. Since the chip is relatively fragile and easily damaged, the chip pick-up head is required to have precise control of the pressing force. Most of the existing chip pick-up heads control the downforce by means of a motor, and realize the downforce control by controlling the motor current. However, since the motor is a nonlinear component, and the current fluctuation of the motor is relatively serious when the motor is working, this control The error of the method is relatively large, and it is difficult to accurately control the downforce of the pickup head. In addition, the SMT process also requires the...

AI Technical Summary

Problems solved by technology

Most of the existing chip pick-up heads control the downforce by means of a motor, and realize the downforce control by controlling the motor current. However, since the motor is a nonlinear component, and the current fluctuation of the motor is relatively serious when the motor is working, this control The error of the method is relatively large, and it is difficult to accurately control the downforce of the pickup head

In addition, the SMT process also requires the chip to be completely aligned with the pad of the circuit board, but the existing technology can only control the relative position of the chip and the pad, but cannot control the rotation angle of the chip, which will easily cause the chip to be placed crookedly, affecting the appearance, and even May cause false welding, resulting in product quality problems

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