Coordinates input device

Details Coordinates input device Coordinates input device

1992-11-06

1996-05-21

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

055180787

ABSTRACT:
In a panel member of a coordinates input device, a first input unit and a second input unit are set on a pair of transparent electrodes and the first input unit only allows input by a member of a relatively large pressing pressure such as by using a pen. The second input unit also allows input by pressing with a member of a relatively small pressing pressure, such as a finger, and thus is not limited to a pen. In order to achieve a coordinates input device of enhanced accuracy in the reading of pressing position by accurately measuring the pressing level at the pressing position, the device possesses a structure in which an X-direction resistive film and a Y-direction resistive film are separated by a tiny clearance and, when the pressing position is pressed, various switches are controlled by a specified procedure such that the X-direction and Y-direction levels of the contact resistance due to the pressing of the position are detected and, only when the pressing levels are sufficient, are coordinates of the pressing position measured.

REFERENCES:
patent: 4306110 (1981-12-01), Nelson et al.
patent: 4581483 (1986-04-01), Ralston
patent: 4698460 (1987-10-01), Krein et al.
patent: 4929934 (1990-05-01), Ueda et al.
patent: 4992630 (1991-02-01), Mlezko
patent: 5008497 (1991-04-01), Asher
patent: 5010213 (1991-04-01), Moriwaki et al.
patent: 5062198 (1991-11-01), Sun
patent: 5181030 (1993-01-01), Itaya et al.
patent: 5231381 (1993-07-01), Duwaer

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