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SMT machine vision system

点击次数:0  信息来源:  发布时间:2018-08-14 17:59:16  【打印此页】  【关闭
High-performance placement machine in a widely used visual system. Vision of the system using the digital image processing technology, after the patch on the head of the suction nozzle absorbing components, in the process of moving to the patch position, by fixed on the patch or a fixed camera image on a certain position in the fuselage, and through image detection optical density distribution of the components, the optical density through the camera in digital form on many small precision CCD optical coupling of light sensor array, grey value of 0 ~ 255. Grey value is proportional to the optical density, the bigger the grey value, the digital image clearer. Digital information storage, coding, amplification, sorting and analysis, the result feedback to the control unit, and the treatment results in the output to the servo system to adjust the location of the compensating element from deviation, finally complete the patch.
Machine, then, based on the reference point on the PCB and components after the camera, how to realize the mount position automatic correction and achieve precise placement? This process is through a series of coordinate transformation between the machine to locate the element of SMT. We through the SMT process to elaborate the working principle of the system. First PCB through the transmission device is transmitted to a fixed position and fixed by the splint establishment and opening to the PCB basis points above, head photograph reference point on the PCB. By this time there are four coordinate system: substrate (Xp, Yp) coordinate system, the camera coordinate system on the head
Figure 2 deviation compensation element pasted on the value principle of confirmation
(Xca1 Ycal), image coordinate system (Xi, Yi) and machine coordinate system (Xm, Ym). The reference point, after the completion of photographic machine will base coordinate system through involvement with the camera and the image coordinate system transformation to the machine coordinate system, SMT position determine such goals. Then stick the opening pick up components after moving to a fixed camera position, a fixed camera for photographic elements. At this moment is also four coordinate system: stick the opening coordinate system is also a suction nozzle (Xn, Yn), a fixed camera coordinate system (Xca2 Yca2), image coordinate system (Xi, Yi) and machine coordinate system (Xm, Ym). Photo after the completion of the element, the machine in the center of the image coordinate system to calculate the component characteristics of coordinate, through involvement with the camera and the image coordinate system transformation to the machine coordinate system, the comparison in the same coordinate system components center coordinates and suction nozzle center coordinates. Two coordinate location deviation compensation value of the difference is the need to. And then to determine the goal of the SMT position according to the same coordinate system, the machine control unit and servo system can control accurately pasted on the machine.
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