Position sensor

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G - Physics

06

K

340/135.1

G06K 11/06 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1228407

14 ABSTRACT: Position sensor. The force-sensitive position sensor or writing tablet is composed (for each of the two coordinate directions) of two layers of parallel extending light conductors having a spacing of 0.1 mm or less, the distance between the two layers being approximately 5 µm. By locally exerting a force on the carrier material in which the light conductors ar embedded (for example), by means of the tip of a stylus), the light conductors are geometrically deformed. These deformations cause a variation of the optical coupling between the two locally deformed conductors, thus causing a detectable transfer of light (variation) from one conductor to the other. By connection of one layer to a light source and the other layer to a suitable detector, a force-sensitive position sensor can be constructed by means of electro-optical means.

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