JPH04245521A - Two-dimensional displacement detector - Google Patents

Abstract

PURPOSE:To offer a two-dimensional displacement detector having a long lifetime which is excellent in the environmental resistance and the detecting reliability. CONSTITUTION:The two-dimensional displacement detector is provided with a stator 16 and a slider 17. The stator 16 consists of four gears 12-15, and the windings 1 are wound round all gears 12-15 so that the magnetic poles of the gears adjacent to each other have the phases opposite to each other in an energizing state. Furthermore two pairs of gears 12, 14 and 13, 15 are defined with combination of gears which are not adjacent to each other among those gears 12-15. The windings 2 and 3 are wound round the gears 12-15 so that the magnetic poles of the gears opposite to each other has the phases opposite to each other in an energizing state. Meanwhile the slider 17 can move in an area enclosed by the gears 12-15 in two degrees of freedom and is identical with a magnetic body having the same shape at the parts opposite to the gears 12-15 respectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-dimensional displacement detector which is mainly used as an input device for the operation of a control machine and for multi-directional operation of a display device such as a CRT.

0002

2. Description of the Related Art Conventionally, a two-dimensional displacement detector called a joystick using two potentiometers has been used as an input device for operating a control machine or for multi-directional operation of a display device such as a CRT. FIG. 7 is a perspective view showing an example of a joystick, and the potentiometer 35 is connected to the movable part 3.
1 and is coupled so that its input shaft moves in conjunction with the movement of the lever 30 in the X direction. This allows the potentiometer 35 to indicate the movement of the lever 30 in the X direction by a change in its resistance.

The movable part 31 is supported by a fixed part 32 fixed to a stand 33 so as to move in conjunction with the movement of the lever 30 in the Y direction, and the potentiometer 34 is fixed to the fixed part 32, and the movable part 31 The input shaft is connected so that it moves in conjunction with the movement of the input shaft. This allows the potentiometer 34 to indicate the movement of the lever 30 in the Y direction by a change in its resistance. From the above, this joystick can be used to simultaneously indicate two displacements as resistance changes by tilting the lever 30, and can be used as an input device for two parameters such as direction.

0004

The potentiometer used in the above-mentioned joystick is generally provided with an electrode that slides on a resistor in conjunction with the input shaft. Therefore, there was a problem that the electrodes were easily worn out and the lifespan of the two-dimensional displacement detector was shortened.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a long-life two-dimensional displacement detector.

[0006]

[Means for Solving the Problems] The present invention relates to a two-dimensional displacement detector, which is mainly used as an input device for multi-directional operation of a control machine and a display device such as a CRT. The above-mentioned object of the invention is to consist of a magnetic material having four teeth, and to provide a first magnetic body to all four teeth so that the magnetic poles of adjacent teeth among the four teeth are in an opposite phase state when energized. A winding wire is wound, and non-adjacent teeth of the four teeth are combined to form two sets, and the two sets are arranged such that the magnetic poles of the opposing teeth of each set are in an opposite phase state when energized. a stator each having a second winding wire and a third winding wire wound thereon; and a stator movable with two degrees of freedom within a region surrounded by the four teeth;
By providing a slider made of a magnetic material, each of which faces the four teeth and the opposing portions have the same shape, the structure has a fulcrum equidistant from the four teeth, and the center portion of the slider By additionally providing a penetrating lever, the above structure further includes an excitation means for applying an excitation signal to the first winding, and an excitation means for applying an excitation signal to the first winding, and an excitation means for applying an excitation signal to the second and third windings during application of the excitation signal. By additionally comprising an analog/digital conversion means for converting each of the signals into numerical values, and a numerical conversion means for converting the two numerical values digitized by the analog/digital conversion means into displacement amounts in two directions of the slider. achieved.

[0007]

[Operation] Since the two-dimensional displacement detector of the present invention utilizes changes in magnetism to detect displacement, the two-dimensional displacement detector itself can be extended in life by making the detection section non-contact structure.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a two-dimensional displacement detector according to the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is a sectional view taken along line II.

The stator 16 is made of a soft magnetic material such as a silicon steel plate, and has four teeth 12, 13, 14, 1 provided on four sides.
5 is fixed to the casing 20. Furthermore, each tooth 12, 13, 14, 15 emits four loops of magnetic flux as shown by the arrows in FIG. 4,5,6,7
It is wrapped through. In addition, among the four teeth, the sets 12, 14 and 13, 15 which are not adjacent to each other are connected to the bobbins 8, 10 and 9, 11 by windings 2 and 3 in a direction that cancels the electromotive force against the magnetic flux. It is wrapped through. That is, when the windings 2 and 3 are energized, the opposing teeth 12 and 14
and windings 2 and 3 so that the magnetic poles of 13 and 15 are in opposite phase.
is wrapped.

The slider 17 is made of a soft magnetic material such as a silicon steel plate, and each portion facing the teeth 12, 13, 14, 15 always has the same circular shape. The slider 17 is supported by the guide 19 so as to be kept horizontally at all times, and the slider 17 has teeth in the center.
Joint 2 equidistant from 2, 13, 14, 15
A lever 18 having 6 as a fulcrum is installed therethrough. Therefore,
The slider 17 is configured to move horizontally in the direction in which the lever 18 is pushed down, and the slider 17 is configured to move in two degrees of freedom in the X direction and the Y direction in accordance with the movement of the lever 18.

FIG. 2 is a block diagram showing an example of a detection device using the above-described two-dimensional displacement detector of the present invention, in which a microcomputer 40 receives a data request command S at fixed cycle timing or by external serial communication.
At the timing when COM is received via the serial communication interface 44, an excitation command signal PO is output to the excitation circuit 41. The excitation circuit 41 receives an excitation command signal P
When O is received, the teeth 12, 13, 14, 15 of the stator 16
The winding 1 wound around the coil 1 is excited by a square wave pulse signal P1. At this time, if the position equidistant from the four teeth is taken as the origin of the orthogonal coordinates
The electromotive voltage signals P2 and P3 output from the teeth 12, 1
Due to the difference in magnetic resistance due to the difference in air gaps between the slider 17 and the slider 17, the signal P1, which excites the winding 1, is amplitude-modulated by XC and YC.

Electromotive voltage signal P output from windings 2 and 3
2 and P3 are converted into numerical signals DX and DY by A/D converters 42 and 43, respectively, and output to the microcomputer 40. After the microcomputer 40 corrects detection errors included in the numerical signals DX and DY,
Unit conversion, coordinate conversion, etc. are performed and output to the serial communication interface 44 as two numerical signals D1 and D2 indicating the displacement of the slider 17. The serial communication interface 44 is adapted to output the two numerical signals D1 and D2 indicating the displacement of the slider 17 to the outside as serialized numerical signals SD1 and SD2.

FIG. 5 is a plan view showing another example of the two-dimensional displacement detector of the present invention, FIG. 6 is a sectional view taken along line II, and FIG.
Components that are the same as those in FIG.

The stator 24 is made of a soft magnetic material such as a silicon steel plate, and has four teeth 12, 13, 14, 1 provided on four sides.
5 is fixed to the casing 23. Furthermore, each tooth 12, 13, 14, 15 has a winding 1 attached to a bobbin 4.
, 5, 6, and 7 in the same manner as the two-dimensional displacement detector shown in FIG. Also, 12 of the 4 teeth are not adjacent.
, 14 and 13, 15, windings 2 and 3 are wound through bobbins 8, 10 and 9, 11 in the same manner as in the two-dimensional displacement detector shown in FIG.

The slider 25 is made of a soft magnetic material such as a silicon steel plate, and each portion facing the teeth 12, 13, 14, 15 always has the same square shape. A lever 21 having a universal joint 22 as a fulcrum, which is equidistant from the teeth 12, 13, 14, and 15, is inserted through and coupled to the center of the slider 25. Therefore, the slider 25 always moves toward the direction in which the lever 21 is pushed down.
The direction of the surface facing 13, 14, and 15 in the XY plane is configured to move without changing, and the slider 25 is configured to move approximately in the X direction and Y direction with two degrees of freedom in accordance with the movement of the lever 21. It has become.

[0016] In such a two-dimensional displacement detector, 4
The position equidistant from the teeth is the origin of the orthogonal coordinates XY, and the center position of the slider 25 is the coordinate (
XC, YC), when winding 1 is excited, winding 2
The two electromotive voltage signals output from the teeth 12 and 3 are
3, 14, 15 and the slider 25 due to the difference in magnetic resistance due to the difference in the air gap, the signal becomes a signal obtained by exciting the winding 1 and amplitude-modulating it by XC and YC. Therefore,
If connected to the detection device shown in Figure 2, the slider 25
The displacement can be quantified and detected.

[0017] Furthermore, with the four teeth of the stator facing outward,
The present invention can also be implemented with a structure in which the slider surrounds the stator. Furthermore, the winding can be excited by the detection device not only by pulses but also by alternating current such as a sine wave.

[0018]

As described above, according to the two-dimensional displacement detector of the present invention, it is possible to eliminate the contact part, that is, the wear part of the detection part like a conventional joystick, so that it has a long life and environmental resistance. Excellent, high detection reliability can be maintained. Furthermore, since the structure is simple, costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a two-dimensional displacement detector of the present invention.

FIG. 2 is a block diagram showing an example of a detection device using the two-dimensional displacement detector shown in FIG. 1;

FIG. 3 is a plan view of the two-dimensional displacement detector shown in FIG. 1;

FIG. 4 is a sectional view taken along line II of the two-dimensional displacement detector shown in FIG. 3;

FIG. 5 is a plan view showing another example of the two-dimensional displacement detector of the present invention.

FIG. 6 is a sectional view taken along line II of the two-dimensional displacement detector shown in FIG. 5;

FIG. 7 is a perspective view showing an example of a joystick that is a conventional two-dimensional displacement detector.

[Explanation of symbols]

1 Winding wire 2 Winding wire 3 Winding wire 12 Teeth 13 Teeth 14 Teeth 15 Teeth 16 Stator 17 Slider 24 Stator 25 Slider 40 Microcomputer 41 Excitation circuit 42 A/D converter 43 A/D converter

Claims (4)

[Claims] [Claim 1] Consisting of a magnetic material having four teeth, all four teeth have first magnetic poles so that the magnetic poles of adjacent teeth among the four teeth are in an opposite phase state when energized. A winding is wound, and non-adjacent teeth among the four teeth are combined to form two sets, and each of the two sets is arranged such that the magnetic poles of the opposing teeth of each set are in an opposite phase state when energized. a stator having a second winding and a third winding wound thereon; and a stator which is movable with two degrees of freedom within a region surrounded by the four teeth, and which faces the four teeth. A two-dimensional displacement detector comprising a slider made of a magnetic material, each part of which has the same shape. 2. The two-dimensional displacement detector according to claim 1, wherein the slider has a circular shape. 3. The two-dimensional displacement detector according to claim 1, further comprising a lever having a fulcrum equidistant from the four teeth and passing through the center of the slider. 4. Excitation means for applying an excitation signal to the first winding; and excitation means for applying an excitation signal to the first winding;
analog/digital conversion means for converting into numerical values each of the signals output from the windings; and numerical conversion means for converting the two numerical values digitized by the analog/digital conversion means into displacement amounts in two directions of the slider. A detection device using the two-dimensional displacement detector according to claim 1.