CPC G06F 3/0414 (2013.01) [G06F 3/042 (2013.01); G06F 3/0416 (2013.01)] | 22 Claims |
1. An input device comprising a plurality of optical vibration sensors mounted in a common housing, each optical vibration sensor comprising:
a diffractive optical element;
a light source arranged to illuminate said diffractive optical element such that a first portion of light passes through the diffractive optical element and a second portion of light is reflected from the diffractive optical element; and
a photo detector arranged to detect an interference pattern generated by said first and second portions of light;
wherein each optical vibration sensor is configured so that in use, after the first portion of light passes through the diffractive optical element, the first portion of light is reflected from a reflective surface onto the photo detector;
wherein the input device is adapted to be placed on or attached to a surface of a solid body; and
wherein the input device is configured:
using two or more of the optical vibration sensors, to detect vibrations in the solid body; and
to use at least one of (i) a relative phase of the vibrations and (ii) a relative amplitude of the vibrations to determine information regarding a point of contact of an object on the surface of the solid body.
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