This part is a kind of semiconductor called PLN2020.

Function of this product has Twin-Eye Laser Sensor.

Manufacturers : Philips

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Some of the text within the PDF file :

Complete navigation sensor PLN2020 t4U ee twin-eye h laser sensor that works on virtually all surfaces S a t Introduction a DPLN2020 twin-eye laser sensor is a highThe Philips’ . precision, low-power consuming, small-sized, w ultra-fast, single-component, laser-based tracking device for use in w computer mice, identification devices, printers and mobile w phones. Philips Laser Sensors General information The PLN2020 is a fully integrated single-component, robust, self-aligning and small-sized (<180 mm3) laserbased tracking device. The 11-pin 3.85-mm high twin-eye laser sensor has a printed circuit board footprint of a mere 6.8 mm x 6.8 mm and incorporates lenses for its two lasers in the package assembly. Thanks to a dedicated laser power control scheme, energy use is limited to a minimu [ ... ]

PLN2020 PDF Datasheet Download