Patent ID: 9223418
Filing Date: 2015-12-29
Classification: G02B,G06F,G06K

Abstract:
1. A pen digitizer, comprising: light guides configured coaxial within a housing of the pen digitizer to encircle an imaging tip of the pen digitizer, the light guides configured to focus light around the imaging tip of the pen digitizer through which encoded bits of a segment in an encoded micro pattern are imaged; a photo array configured to optically image reflected light from the encoded bits as a segment image of the encoded micro pattern; a digital signal processor configured to receive the segment image from the photo array and generate segment data that represents the encoded bits of the segment that is imaged; and a transmitter configured to communicate the segment data to a computing device that generates a segment trapezoid based on the segment data and determines a tilt angle of the pen digitizer based on a transition from the segment trapezoid to a squared segment image.