Pointing device by sensing geomagnetic field
First Claim
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1. A pointing device of a computer comprising:
- a housing;
at least a button installed on the housing for generating a control signal when a user presses the button; and
a sensing module installed inside the housing comprising;
a first magnetism detector comprising a first sensing axis, the first magnetism detector generating a first sensing signal according to a relative change of the first sensing axis with respect to a geomagnetic field;
a second magnetism detector comprising a second sensing axis, the second magnetism detector generating a second sensing signal according to a relative change of the second sensing axis with respect to the geomagnetic field;
an amplifier connected to the first magnetism detector and the second magnetism detector for amplifying the first sensing signal and the second sensing signal; and
a decoder connected to the amplifier for generating a two-dimensional displacement signal according to the amplified first sensing signal and the amplified second sensing signal;
wherein the first sensing axis is not parallel with the second sensing axis and forms a predetermined angle with the second sensing axis, and the first magnetism detector and the second magnetism detector respectively sense changes of the first sensing axis and the second sensing axis with respect to the geomagnetic field when the user moves the pointing device such that the decoder generates the corresponding two-dimensional displacement signal according to the changes of the first sensing axis and the second sensing axis with respect to the geomagnetic field.
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Abstract
A pointing device of a computer includes a sensing module and a button. The sensing module has two magnetism detectors, each detector having a unique sensing axis. The magnetism detectors generate signals according to the relative changes of the sensing axes with respect to the geomagnetic field. The sensing signals and button signal are processed and transmitted to the computer for use in controlling the function of the computer.
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Citations
4 Claims
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1. A pointing device of a computer comprising:
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a housing;
at least a button installed on the housing for generating a control signal when a user presses the button; and
a sensing module installed inside the housing comprising;
a first magnetism detector comprising a first sensing axis, the first magnetism detector generating a first sensing signal according to a relative change of the first sensing axis with respect to a geomagnetic field;
a second magnetism detector comprising a second sensing axis, the second magnetism detector generating a second sensing signal according to a relative change of the second sensing axis with respect to the geomagnetic field;
an amplifier connected to the first magnetism detector and the second magnetism detector for amplifying the first sensing signal and the second sensing signal; and
a decoder connected to the amplifier for generating a two-dimensional displacement signal according to the amplified first sensing signal and the amplified second sensing signal;
wherein the first sensing axis is not parallel with the second sensing axis and forms a predetermined angle with the second sensing axis, and the first magnetism detector and the second magnetism detector respectively sense changes of the first sensing axis and the second sensing axis with respect to the geomagnetic field when the user moves the pointing device such that the decoder generates the corresponding two-dimensional displacement signal according to the changes of the first sensing axis and the second sensing axis with respect to the geomagnetic field. - View Dependent Claims (2, 3, 4)
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Specification