US 6,606,087 B1 · Coordinate reader

Abstract

A coordinate reader includes a base member having a plurality of X-loop wires provided in a first surface of the base member, a plurality of Y-loop wires provided in a second surface of the base member, a first input plane provided over the plurality of X-coils and a second input plane provided over the plurality of Y-loop coils. When a coordinate input device generates an alternating magnetic field for inputting its coordinates into the coordinate reader, the coordinate reader detects signals generated on the X-loop wires and the Y-loop wires in response to the alternating magnetic field. Then, the coordinate reader determines, based on the detected signals, which of the first input plane or the second input plane the coordinate input device is placed on, and the coordinates of the coordinate input device on the first input plane or the second input plane.

Claims20

Dependent claims

A coordinate reader for detecting coordinates designated by an alternating magnetic field, comprising:

a base member comprising:
a first side including a first loop wire that generates a first signal in response to the alternating magnetic field, and a first input plane;
a second side including a second loop wire that generates a second signal in response to the alternating magnetic field, and a second input plane;
a signal detection unit that detects the first and the second signals;
an input plane determination unit that determines from which of the first input plane or the second input plane the coordinates are designated by the alternating magnetic field by using at least one of the first and the second signals;
and
a coordinate determination unit that determines a first coordinate and a second coordinate that are designated by the alternating magnetic field based on the detected first and second signals, respectively.

4 more elements

Dependencies are inferred from the claim text.

Coordinate reader

Life of this patent

Coordinate reader

Life of this patent

Abstract

Claims20