Position sensor having at least two layers of light conductors

Details Position sensor having at least two layers of light conductors Position sensor having at least two layers of light conductors

1984-04-06

1986-09-02

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 340365P, H01J 516

Patent

active

046098160

ABSTRACT:
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 .mu.m. By locally exerting a force on the carrier material in which the light conductors are embedded, 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.

REFERENCES:
patent: 4480182 (1984-10-01), Ely et al.
patent: 4486095 (1984-12-01), Mitchelson

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