Prior to executing the automated alignment of the lens to the sensor, adhesive is dispensed onto the periphery of the image sensor or sensor housing. The dispensed adhesive pattern may be in the form of beads (lines or circles) for larger form factor cameras or micro-dots for ultra-compact optical modules. Adhesive can be applied via positive dispense or jetting methods. During lens alignment, the lens is moved in free space within the bead of adhesive. Once the final lens position is determined, the adhesive is solidified, or cured, by initiating a polymer reaction via exposure to UV light.
Our Pixid systems utilize a vision-guided dispense substation for accurate and repeatable dispensing of adhesive for use in fixing the lens relative to the image sensor. Additionally, machine vision is used to automatically verify the quality of the dispense pattern, including an analysis of continuity, width measurement, and area. Kasalis has established working relationships with leading adhesive suppliers to help with the selection of adhesives for our customers' applications. This, combined with our in-house expertise with adhesive attach will ensure that appropriate considerations are made when selecting adhesives, dispensing options, and UV cure schedules.
© Kasalis Inc. 2017; Photo © Edua Wilde Photography 2015