Position detection system using laser speckle

Details Position detection system using laser speckle Position detection system using laser speckle

2005-09-08

2010-06-15

Lefkowitz, Sumati (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S173000, C345S175000, C178S018010, C178S018090

Reexamination Certificate

active

07737959

ABSTRACT:
A detection system. The detection system includes a substrate, a laser, and a sensor array. The substrate includes a first surface, a second surface conceptually divided into multiple areas, and a third surface. The laser is configured to emit electromagnetic radiation into the substrate and incident subsequently onto second surface areas. The sensor array is configured to capture electromagnetic radiation reflected from the second surface. If a first dielectric, having first dielectric constant, is in contact with some areas, electromagnetic radiation incident thereon experiences total internal reflection and if a second dielectric having second dielectric constant is in contact with other areas, some of the electromagnetic radiation incident thereon is reflected back into the substrate by the second dielectric. The sensor array is configured to detect laser speckle originating from the incidence of the electromagnetic radiation at the second surface and to detect electromagnetic radiation reflected from the second dielectric.

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