one. background
In recent years, with the LED market demand and capacity increasing, the production of LED by manpower has been far from meeting the market demand; many equipment manufacturers are also developing different varieties, different types of special or universal automatic solid crystal machine. The development and demand of LED have increased the perfection of LED equipment, and also accelerated the improvement of the solid crystal machine. The manufacturers have also joined the competition of LED manufacturing equipment. This device is a fully automatic LED high-speed solid crystal machine.
two. Solid crystal machine technology introduction and specification
Solid crystal machine mainly consists of six major components
1. Suction oscillating arm system: composed of pick-up head assembly and welding arm
2. Dispensing system: driving the dispensing arm to rotate and move up and down to drive the rotation of the disc.
3, ejector system: consists of ejector pins and vacuum discs for separating wafers
4, wafer stage system: consists of two linear motor drive XY platform and a calibration mechanism
5, in and out of the material system: control the stent into the material.
6. Optical system: Sub-half crystal optical system and solid crystal optical system, respectively, for the absorption and welding of the chip.
Equipment work flow can be roughly divided into the following steps: 1 take crystal; 2 suction crystal; 3 dispensing; 4 solid crystal; 5 home. As shown in Figure 1 below. The specific workflow is shown in Figure 2.
Figure 1 Full-automatic LED high-speed solid crystal machine equipment
Figure 2 solid crystal machine work flow chart
three. Solid crystal machine process requirements
1, after the wafer is attached, the glue coverage exceeds 3/4.
2. The glue overflow height cannot exceed 80% of the wafer height.
3, the wafer tilt ± 5 degrees.
4. When each axis servo driver fails, the fault signal should be transmitted to the upper computer. The upper computer sends a fault clear signal to clear the fault in time.
5, suction crystal, solid crystal platform driver coordination to be coordinated, the single axis in place time should be less than 5ms, and overshoot less than plus or minus 5 pulses.
6, swing arm axis reciprocating time as short as possible to improve work efficiency.
four. Solid crystal machine process features and difficulties
1, a machine for a variety of LED solid crystal operations.
2. Using the dual-vision positioning system, once it is found that there is a deviation in the absorption susceptibility, the linear motor XY platform driver can quickly respond to the compensation of a small distance, making the solid crystal precision high. As shown in FIG. 3, the horizontal axis represents time s and the vertical axis represents pulse puls.
Figure 3 Visual Positioning Compensation Follow
3, modular automatic teaching, set simple and fast.
Figure 4 Comparison of Pulses and Encoder Feedback Pulses from Host Computer in Automatic Teaching
4. It can be diversified by point-by-point positioning or by two-point positioning.
5, the bracket plate loading and unloading, different products only need to replace the fixture.
6, standard humane Windows interface design.
Fives. QXL with solid crystal machine program introduced
1. There are six major parts of the LED automatic solid crystal machine. Among them, the high-accuracy Sutra linear motor X/Y platform driver for the driver is QXL high-end servo driver, see Figure 5 below; the solid crystal linear motor B/C platform adopts QXL. High-end servo drive, see Figure 6 below; Swing arm platform swing arm axis W uses DDR with QXL servo driver, see Figure 7 below; upper and lower suction arm adopts ordinary rotary servo motor with corresponding driver; dispensing system consists of two AC servo motors The dispensing arm is separately driven to rotate and move up and down. A stepper motor drives the rubber disk to perform a rotary motion. See Figure 8 below.
Figure 5 Suction crystal XY platform Figure 6 Solid crystal BC platform
Figure 7 Swing arm DDR platform Figure 8 Dispensing platform
2. Figure 9 below shows the application site.
Figure 9 automatic LED solid crystal application debugging site picture
The lower left corner of Figure 9 is the QXL high-end servo driver. The QXL with linear motor and DDR perfectly fulfills the requirements for high-speed and high-precision of the LED die-bonding machine. The following figure 10 shows the application results. The PDose and the motor are generated by the upper computer. Location Pos follows the situation. The horizontal axis represents time, the unit is s, and the vertical axis represents the number of pulses.
Fig. 10 Response time and overshoot of crystal pick-up and die-bonding platform for QX with linear motor
six. Scheme advantages
1. Suction crystal and solid crystal platform adopt linear motor with QXL high-end servo driver. Compared with the traditional rotary servo, the production and processing efficiency is improved, and the high-speed and high-precision performance of the linear motor is exerted. Drive response time <5ms, overshoot less than 5 pulses.
2. The traditional swing arm axis generally adopts a rotary servo motor. This fully automatic LED solid crystal swing arm axis adopts a DDR torque motor with a QXL high-end servo driver to shorten the reciprocating time of the single-axis swing arm, and can shorten the time by approximately 15%. time. The processing efficiency has been significantly improved.
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