TOUCH TRACKING OPTICAL INPUT DEVICE

摘要

A trackpad has a cover abutting a housing. The cover includes a body that is transparent to infrared light and visible light. A first ink, deposited in a first area on a surface of the cover body, is transmissive to the infrared light and substantially opaque to visible light. A second ink is deposited in at least one second area on the surface of the cover body and is transmissive to visible light. A first emitter, within the housing, produces infrared light that is transmitted through the cover. A second emitter, within the housing, produces visible light that is transmitted through each second area of the cover. An optical sensor is provided within the housing for receiving infrared light that is reflected by an external object back through the cover.