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WEPTECH offers cost-effective and void-free convection soldering also for challenging CMOS sensors

Meanwhile, the use of CMOS sensors has prevailed in industrial image processing and many well-known manufacturers use this type of image sensors. WEPTECH elektronik has been offering a special process since 2011 with which also CMOS sensors can be soldered onto circuit boards with long-term stability and thus positioned itself in 2016 with a press article in various specialist magazines. In recent years, the manufacturing technology has been optimized so that a reliable, cost-effective and efficient convection process is now available with which CMOS sensors can be soldered to printed circuit boards with little void. A number of assembled circuit boards in the 6-digit range with over 30 different sensor types for well-known camera manufacturers throughout Europe prove this.

The sensitive sensors are demanding in their handling and processing. In order to ensure that an industrial camera continuously delivers stable images, measures are necessary during the production of the hardware that improve the robustness of the image sensor. Ultimately, the circuit board has to withstand stress like temperature cycles or mechanical stress such as vibration. New CMOS sensors require a much more careful approach, due to increased sensor sizes, higher resolutions and speeds. This leads to a larger number of pins to be contacted with smaller distances and thus to a demanding production process for soldering the sensor on the board.

WEPTECH already talks continuously with its customers during the layout process to adapt the board design to the optimized production steps. This saves both partners time and money; especially since the costs of individual CMOS sensors can be quite high.

“Thanks to a special pretreatment and a new adjustment of the process parameters, the sensors can be soldered in line in a thermally gentle and almost void-free manner, strictly following the manufacturer's recommendations. The process is absolutely reproducible and robust. This has been proven by the cameras we manufacture in many different batches in intensive stress tests with climatic chambers, long-term operation and on/off operation." Walter Quinttus, Technology engineer at WEPTECH elektronik.