Video Measuring Machine Working With Probe
Time:2017-12-26 10:16 Author:administrator
Point Technologies Co., Ltd. Specially provide small-diameter metal line and the precision electrochemical measurement in the pipe and micro processing products and services. Recently, the company will combine motion control with vision of the machine to apply into a whole new field of semiconductor industry: a probe inspection.
The designer will combine Cognex machine vision systems with motion control to integrate into the automatic probe checkpoint PointScan in order to achieve faster speeds and higher detection accuracy, but also makes the whole system more easy to operate. The system can automatically record each test, while improving its reproducibility, it can also provide feedback information to facilitate a process improvement.
The external shape of the probe is very important for wafer-level test for the success of the operation, Point Technologies combined manual video detection with optical comparator to produce the probe on the probe card with the stringent requirements. But with the increasing IC chip production and demand for a probe, we need more labor to achieve it. Probe checks accounted for a large part of the manufacturing time, therefore, it’s necessary for us to design a system to make it automatic.
At the beginning, this company has done some work to assess the feasibility of using a machine vision system to improve the detection efficiency, in addition, the system must be able to be achieved repeatable measurements within 0.00002 inch. Our team know little about the vision systems, but they concluded that: you can choose Cognex In-Sight vision sensors, because the product is easy to use and equipped with the user software.
Steve Neely from Point Technologies Corporation Semiconductor manager, explains:. "just require little amount of investment, In-Sight will be able to help us prove that the machine vision can be used in our production, we can build a prototype system to prove that this concept is feasible in 4-5 weeks.
In-Sight is a powerful machine vision sensors, which includes a visual processing unit DSP-based, high-speed digital camera, built-in lighting control and built-in discrete I / O ports. It also provides real-time display standard VGA output, built-in Ethernet capabilities and a built-in serial port.
Neely said: "We do not have a formal training course , after we take 30 hours to know well In-Sight, we can set up the inspection program to provided with user manuals and telephone technical support, our team is skilled with its visual data tables environment, visual software tool library and built-in user interface quickly. Point Technologies company found that In-Sight is a very good validation tool, but is not suitable for the final application of their company. So the designers choose to customize the Cognex VisionPro PC-based vision systems. Upgrading the system into VisionPro platform spends more of their time learning, they also need help from the professional Cognex vision systems integration experts. But Neely said: "These are very worthwhile investment, so we used many times in the later visual code system.
One of the biggest challenges for machine vision applications is to choose a suitable imaging system in order to ensure image quality. After having a lot of light and optics experiments, the team installed an optical distortion which can eliminate high magnification telecentric lens and a 2x2-inch LED backlight diffuser to be able to generate the necessary appropriate image resolution.
Combination of visual and motion system
Neely said: "Our engineers combined visual, movement, user interface, network communication, with database using Microsoft Visual Basic to manage and control logic for visual guided motion control system. For example, if we have this system, we need help of the quick visual system which must be able to image capture, analysis and measurement and find the probe needs to synchronize the movement, first comprehensive examination of a probe, and then move to another probe. "
The company's team will apply the concept of a successful application into the plant's manufacturing system in half a year. Since the end of 2004, they have installed five sets of systems. These systems are mainly used for the measurement probe, can be used to measure the electrosurgical electrode and the other components of the medical instrument of the product.
After combining the visual system with the motor system ,the engineer have to calibrate this two systems, If the deformation of the optical lens, the mounting angle of the camera or due to a change resulting in a perspective view, which is a factor not only need to find the ratio of the pixel can be measured and the associated range. Vision System Tools library includes a special algorithm can correct these errors.
Reduce a lot of time to Inspect.
After the application of machine vision systems, the design team can make the computer control detection systems to detect all the work and most of the data analysis. Tests have shown that this makes the detection time is reduced to 1/10 of original one. one worker takes 20 minutes time to measure 12 probe and the data recorded on paper in the past. But PointScan takes less than two minutes to complete the measurement, recording data and automatically display the data for operator inspection.
It’s very important for Machine vision systems for accurate measurement of small parts and record the test results, these measurement data can be used to track parts, productivity, and help identify problems affect the efficiency of the process.
Data collected by the visual system can help people increase the production processes for understanding. PointScan provides the necessary feedback for operating personnel and quality management team, so that they can "reinventing" systems and processes successfully to improve and increase efficiency.
