1. Camera Resolution and Transmission Interface
The goal of our work is to obtain the appropriate image, extract useful information or control the repair process, to inspect, detect, mark, and classify Phone PCB defects in real-time.
In order to improve the accuracu, 1.3 megapixel camera can basically meet the needs, but sometimes because of the effect of edge sharpness, when extracting the edge, just shift a pixel, then the accuracy is greatly affected.
Choose a USB, 5 megapixel Gige camera based on the distance, stability, and data size (bandwidth) of the transmission.
Therefore, if we choose a 5 million camera, we can also allow the extracted edge to deviate by about 5 pixels, which is a good guarantee of measurement accuracy.
2. CCD & CMOS
If the PCB to be photographed is moving, and the PCB to be processed is also an PCB moving in real time, then of course, a 4K CCD Camera with a CCD chip is most suitable. However, some manufacturers’ CMOS cameras can also be used as CCDs if they use frame exposure.
Also, if the PCB moves at a very slow speed, the distance of the movement of the PCB is small within the exposure time range we set, and the pixel size is also within one or two pixels.
Therefore, it is also suitable to select a 5MP CMOS camera. Because within the exposure time, the deviation of one or two pixels is not visible to the human eye (if it is not used for measurement), but the deviation of more than 2 pixels, the image taken by the PCB has a smear. In the case, you can not choose CMOS camera.
3. Frame rate and Linear array & area array
Depending on the speed to be detected, the frame rate of the selected camera must be greater than or equal to the detection speed. In the situation of equal to the time you process the image must be fast, and must be completed within the exposure and transmission time of the camera.
With the circumstances of the detection accuracy is very high, the resolution of the area array camera does not meet the requirements, of course, the linear array camera is an inevitable choice.
4. CCD Target surface
The size of the target surface affects the length of the focal length of the 8-50mm Camera lens. At the same viewing angle, the larger the target size, the longer the focal length.
Generally speaking, the CCD target surface should be combined with the physical installation space to determine whether the working distance of the lens is within the installation space. And the size of the lens is required to be greater than or equal to the camera’s target size.
All of these factors need special attention when you purchase an industrial camera. Phonefix focuses on phone repair, phone repair tools, microscope, industrial camera etc.
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