Patent ID: 9501176
Filing Date: 2016-11-22
CPC Classification: G06F,G06K

Claim Text:
1. A method for using an optical pen, comprising: when a tip of a stylus is in contact with a location of an image on a surface, employing three or more line of sight light detectors on the optical pen to separately detect reflected light from three points around the location, wherein the three or more line of sight light detectors are positioned at angular locations offset along the directional orientation of the stylus formed by the tip, and wherein the detected reflected light is provided by one or more remotely located light sources that are separate from the optical pen; employing the detected lights from line of sight detectors to determine a position and an orientation of the tip of the stylus and the location on the surface; storing information for the position, orientation and location; and modifying the image based on the stored information.