Pointing device
First Claim
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1. A pointing device comprising:
- a sensor for detecting respective components of an applied external force in the X direction and Y direction, converting said components to signals and outputting the signals;
an amplifier section for respectively amplifying outputs from the sensor;
a reference voltage generator for outputting to the amplifier section a reference voltage for adjusting an offset voltage output from the amplifier section when no external force moving the cursor is applied to the sensor; and
a microcomputer for modifying a coefficient, used when a reference voltage for determining a cursor speed is calculated, in response to the size of an output from the amplifier section.
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Abstract
In the pointing device of the present invention, a sensor is connected via an amplifier section to a microcomputer. Further, a reference voltage generator is connected to the microcomputer and the amplifier section. With this construction, the microcomputer modifies a coefficient, used when calculating a reference voltage for determining a cursor speed, in response to the size of a force applied to the sensor by an operator.
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Citations
8 Claims
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1. A pointing device comprising:
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a sensor for detecting respective components of an applied external force in the X direction and Y direction, converting said components to signals and outputting the signals; an amplifier section for respectively amplifying outputs from the sensor; a reference voltage generator for outputting to the amplifier section a reference voltage for adjusting an offset voltage output from the amplifier section when no external force moving the cursor is applied to the sensor; and a microcomputer for modifying a coefficient, used when a reference voltage for determining a cursor speed is calculated, in response to the size of an output from the amplifier section. - View Dependent Claims (2, 3, 4, 5, 8)
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6. A personal computer utilizing a pointing device, the pointing device comprising:
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a sensor for detecting respective components of an applied external force in the X direction and Y direction, converting to the components signals and outputting the signals; an amplifier section for respectively amplifying outputs from the sensor; a reference voltage generator, for outputting to the amplifier section a reference voltage for adjusting an offset voltage output from the amplifier section when no external force moving the cursor is applied to the sensor; and a microcomputer for modifying a coefficient, used when a reference voltage for determining a cursor speed is calculated, in response to the size of an output from the amplifier section.
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7. A method for calculating a speed of a pointing device cursor, comprising the steps of,
(a) initializing an offset voltage, (b) monitoring and adjusting the offset voltage every fixed time, (c) reading outputs from an amplifier, (d) calculating amplifier output change amounts, (e) determining whether or not the change amounts are larger than a specified voltage, (f) determining whether or not it is time to adjust the offset voltage, (g) reinitializing the offset voltage at the time of adjusting the offset voltage, if the change amounts are less than the specified voltage, (h) calculating a reference voltage for determining a cursor speed from the amplifier output change amounts, and (i) assembling data and outputting the data to a host device.
Specification