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PixArt Imaging Confidential

4

Overview of Optical Mouse Sensor Assembly

PixArt Imaging provides an IGES file drawing describing the base plate molding features for lens and PCB alignment. PMW3320DB-TYDU

sensor is designed for mounting on a through-hole PCB. There is an aperture stop and features on the package that align to the lens. The

LM31-LNG lens provides optics for the imaging of the surface as well as illumination of the surface at the optimum angle. Features on the

lens align it to the sensor, base plate, and clip with the LED. The LED clip holds the LED in relation to the lens. The LED must be inserted

into the clip and the LED‘s leads formed prior to loading on the PCB.

The HSDL-4261 IR LED is recommended for illumination.

Figure 4. Recommended PCB Mechanical Cutouts and Spacing (Top View)