JPH096530A - Coordinate position input device - Google Patents

Abstract

(57) [Summary] [Object] It is an object of the present invention to provide a coordinate position input device used for an information device, which does not need to adjust the variation of the coordinate position detection unit. An amplifier unit 3 that amplifies the output voltage (a) of the Hall element 1, an A / D converter unit 5 that converts the amplified electric signal into a digital signal, and a control unit 9 that calculates the converted digital signal. The D / A converter 7 for converting the calculated digital signal into an electric signal, and the structure in which the converted electric signal is fed back as the control voltage (b) of the Hall element 1 are provided. The coordinate position input device itself can adjust the variation of the Hall element 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate position input device used for inputting a screen cursor coordinate position of an information device.

[0002]

2. Description of the Related Art A conventional coordinate position input device of this type will be described below with reference to the drawings.

FIG. 2 is a block diagram showing the structure of a conventional coordinate position input device. In FIG.
Is a variable resistor, 23 is an amplifier, 24 is an A / D converter, 2
Reference numeral 5 is a control unit.

The coordinate position in the conventional coordinate position input device configured as described above is converted into an electric signal by the detection unit 21, but the electric signal does not always have the same value but has a variation, and therefore the detection is performed. The variation of the electric signal from the unit 21 is adjusted by the variable resistor 22 and enters the amplification unit 23. The electric signal amplified by the amplification unit 23 is converted into the A / D conversion unit 24.
It is configured to be converted into a digital signal and input to the control unit 25.

[0005]

However, in the above-described conventional configuration, the work of adjusting the variation of the electric signal from the detection section 21 by the variable resistor 22 must be performed, which complicates the configuration and reduces the accuracy. There was a problem that it was bad.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an accurate coordinate position input device that does not require the work of adjusting the variation of the electric signal from the detection unit. .

[0007]

In order to solve this problem, a coordinate position input device of the present invention comprises a detection unit for converting the coordinate position into an electric signal, and an amplification unit for amplifying the electric signal from the detection unit. , An A / D converter for converting the electric signal amplified by the amplifier into a digital signal, a controller for calculating the digital signal of the A / D converter, and the calculated digital signal for conversion into an electric signal The converter is composed of a converter, and an electric signal from the converter is fed back to the detector.

[0008]

With this configuration, the value of the electric signal from the detection unit is calculated by the control unit, and the variation of the detection unit can be adjusted in the coordinate position input device in order to return to the detection unit again.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the coordinate position input device according to the embodiment. In FIG. 1, 10 is X.
The directional coordinate position detection unit 1 is a Hall element, 3 is an amplifier unit, 5 is an A / D conversion unit, and 7 is a D / A conversion unit. Further, 11 is a Y-direction coordinate position detector, 2 is a Hall element,
Reference numeral 4 is an amplifier section, 6 is an A / D conversion section, 8 is a D / A conversion section, and 9 is a control section. Note that the X-direction coordinate position detection unit 10 and the Y-direction coordinate position detection unit 11 have the same operation principle, and therefore the description will be given by the X-direction coordinate position detection unit 10.

First, the output voltage (a) of the Hall element 1 is proportional to the product of the control voltage (b) of the Hall element 1 and the magnetic flux density applied to the Hall element 1. Since the proportional constant varies depending on the Hall element 1, the output voltage (a) also varies.
When this principle is used, the variation of the proportional constant can be canceled by changing the control voltage (b), so that the output voltage (a)
Can be adjusted to any value. That is, the output voltage (a) of the Hall element 1 of FIG. 1 is amplified by the amplifier unit 3,
The A / D converter 5 converts the digital signal into a digital signal, and the controller 9 fetches the digital signal. The D / A converter 7 controls the control voltage (b) of the Hall element 1 so that the digital signal has an arbitrary value. By controlling (1), it is possible to adjust the variation in the output voltage (a) of the Hall element 1.

Also in the Y-direction coordinate position detecting section 11, the control voltage (d) of the hall element 2 and the output voltage (c) of the hall element 2 are used in the same manner as in the X-direction coordinate position detecting section 10.
Can be adjusted.

When the detection of the coordinate position in the X direction and the detection of the coordinate position in the Y direction are performed with a temporal shift, the D / A conversion unit 7 of the X direction coordinate position detection unit 10 and the Y direction coordinate position are detected. Since the D / A converter 8 of the detector 11 is not used at the same time, either one may be used, and the electric signal from the one D / A converter is fed back to both the Hall element 1 and the Hall element 2. It is also possible.

Further, in detecting the coordinate position in the X direction and the coordinate position in the Y direction, two Hall elements are arranged in each direction, and the output voltage signals of the two Hall elements are differentially amplified. Thereby, the fluctuation of the output voltage due to the environmental factor can be canceled out, and more accurate detection can be performed.

[0015]

As is apparent from the above description, according to the present invention, a detection section for converting a coordinate position into an electric signal, an amplification section for amplifying the electric signal from the detection section, and an amplification section for amplifying the electric signal. An A / D converter for converting the electric signal into a digital signal, a controller for calculating the digital signal of the A / D converter, a D / A converter for converting the calculated digital signal into an electric signal, With the configuration in which the electric signal from the D / A conversion unit is fed back to the detection unit, the electric signal from the coordinate position detection unit can be controlled to an arbitrary value by the coordinate position input device itself of the present invention. Therefore, it is possible to realize the coordinate position input device capable of stably exhibiting excellent performance without the need to adjust the variation of the electric signal from the detection unit with the variable resistor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a coordinate position input device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional coordinate position input device.

[Explanation of symbols]

 1 Hall element 2 Hall element 3 Amplifier section 4 Amplifier section 5 A / D conversion section 6 A / D conversion section 7 D / A conversion section 8 D / A conversion section 9 Control section

Claims (1)

[Claims] 1. A detection unit for converting a coordinate position into an electric signal, an amplification unit for amplifying the electric signal from the detection unit, and an A / D conversion for converting the electric signal amplified by the amplification unit into a digital signal. Section, a control section for calculating a digital signal of the A / D conversion section, and a conversion section for converting the digital signal calculated by the control section into an electric signal. The electric signal from the conversion section is sent to the detection section. A coordinate position input device configured to return.