JP2534468Y2 - Coordinate position detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless type coordinate position detecting device which does not require a cursor and a connecting cable for connecting a cursor and a tablet body for reading the indicated position coordinates on a surface. Wiring structure.

[0002]

2. Description of the Related Art A conventional apparatus of this kind is disclosed in
There is an apparatus disclosed in JP-A-204717. This device is composed of a power supply coupling coil that receives an AC magnetic field of a predetermined frequency generated from a power grid plate on the tablet side and captures a voltage in a cursor, and a DC converter that rectifies the captured voltage and converts it to a DC voltage And an oscillator that receives a DC voltage and generates a predetermined signal, and a magnetic field generating coil that is connected to the oscillator and generates a magnetic field. A cursor is formed, and a coordinate position is determined using a magnetic field output from the magnetic field generating coil. It is to detect.

A grid plate for a power supply of this coordinate position detecting device is provided with first and second conductor patterns formed in a lattice shape, and these conductor patterns are mutually shifted by a quarter pitch (period). Have been. The conductor patterns are sequentially connected in series by end connection conductors, and are connected such that currents flowing through conductors adjacent to each other are reversed. With such a configuration, a magnetic field acting on the power supply coupling coil of the cursor is generated regardless of the position of the cursor.

[0004]

The AC magnetic field generated by the power grid plate has a constant amplitude at any position on the tablet plane in order to keep the voltage induced in the power supply coupling coil of the cursor constant. Is required. In the power grid plate of the conventional coordinate position detecting device described above, since the end connection conductor does not exist at the end opposite to the end where the end connection conductor exists, the conductor pattern has symmetry as a whole, and thus the magnetic field And the voltage induced in the power supply coupling coil of the cursor is not constant. In addition, if the pattern on the power grid is a transmission line, generally, when the transmission line becomes long, impedance matching cannot be performed, and therefore, a reflected wave is present and a standing wave is generated. In the above-described conventional coordinate position detecting device, when the device is enlarged, the power supply grid is also enlarged, and the conductor pattern is lengthened accordingly. Another problem is that a uniform magnetic field is generated. The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a coordinate position detecting device capable of obtaining a magnetic field having a constant amplitude at any position on a tablet plane. is there.

[0005]

In order to achieve this object, a coordinate position detecting device according to the present invention comprises a tablet formed by forming a plurality of types of grid-like conductive patterns, and a tablet fixed on a plane of the tablet. A power grid plate for generating an AC magnetic field having an amplitude of, and a power supply coupling coil mounted on the tablet and coupled to an AC magnetic field generated on the tablet to induce an AC voltage, and rectifying the induced AC voltage A cursor having rectifying means serving as a cursor power supply and generating an electromagnetic field in combination with the conductor pattern; a power supply circuit for generating a polyphase alternating current to be supplied to the conductor pattern of the power grid plate; and the cursor And a processing device for inputting a voltage induced in the conductor pattern by an electromagnetic field from the processor and performing signal processing to calculate a plane coordinate position of the cursor. A detection device, the conductor pattern of the power supply grid in plate first pattern and the second formed by stacked and insulated from each other in the grid plate
Each of the conductors of the first and second patterns is alternately connected at opposite ends, and a current in the same direction is applied to each conductor of the first and second patterns. Are connected so as to flow, and resistors for impedance matching are inserted into the circuits of the first and second patterns.

[0006]

According to the present invention, an alternating magnetic field is generated at opposite ends. Also, due to the impedance matching resistance, there is no reflected wave on the pattern, but only a traveling wave.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a conductor pattern of a power grid plate of the coordinate position detecting device according to the present invention. In the figure,
Reference numerals 101 and 102 denote grid plates, which are used by being stacked. q ₁ , q ₂ , q ₃ and q ₄ indicate terminals, respectively. Each of the grid plates 101 and 102 has
A conductor pattern including a first pattern 1 indicated by a solid line and a second pattern 2 indicated by a dotted line is formed.

The directions of the conductors of the first and second patterns are parallel to the Y axis, and the pitch of the arrangement is D / 2.
They are connected in series by end connection conductors indicated by reference numerals 3, 4, 5, and 6. The conductors on the grid plate 102 are arranged with a spatial phase difference of D / 4 in the arrangement pitch direction with respect to the conductors on the grid plate 101.

The first pattern 1 and the second pattern 2 are stacked in a direction perpendicular to the XY plane while being insulated from each other, and the corresponding conductor patterns are formed on the plane of the power supply grid plate. Although they are arranged at positions where they are overlapped by projection, in FIG. 1, for convenience of explanation, the solid line and the dotted line are slightly separated. The same applies to the end connection conductor.

The end connection conductors 4 and 6 of the first pattern 1 and the end connection conductors 3 and 5 of the second pattern 2 are connected in series in the first and second patterns 1 and 2 in a section where they do not exist. Connected so that the currents flowing through the conductors adjacent to each other are reversed. In addition, the first pattern 1 is connected to the conductor of the first pattern 1 and the conductor of the second pattern 2 located at the same plane position so that a current flows in the same direction.
And the second pattern 2 are connected.

The reference numerals 8, 9, 10 and 11 in FIG.
The second pattern cannot be formed on the back surface of the connection conductor pattern indicated by. For this reason, this portion needs to be excluded from the magnetic field generation region having a constant amplitude. Further, a resistor 15 for impedance matching is inserted into the connecting conductor patterns 8 and 10 in the first and second patterns 1 and 2.

With such a configuration, the end connection conductors 3 and 4 of the first and second patterns 1 and 2 are present in a section where they do not exist. Is symmetrical except for the portion of the conductor 8, and the grid plates 301 and 302 have a wider area constituting a magnetic field having a constant amplitude as a whole.

Further, impedance matching is achieved in the first and second patterns 1 and 2 and signal reflection at the power receiving end does not occur. ) Has only traveling waves. Therefore, even if the device becomes larger and the power supply grid becomes larger and the conductor pattern becomes longer, impedance matching is ensured, so that a constant magnetic field is always generated on the power supply grid.

FIG. 2 shows a second embodiment of the conductor pattern of the power grid plate of the coordinate position detecting device according to the present invention. In the second embodiment, the grid plates 201, 2
02, a conductor pattern composed of a first pattern 1 indicated by a solid line and a second pattern 2 indicated by a dotted line is formed, and the pitch of the arrangement is such that the arrangement direction is perpendicular to the conductor direction. Is D / 2 and the first pattern 1
The end connection conductor 4 of the second pattern 2 and the end connection conductor 3 of the second pattern 2 sequentially connect the first and second patterns 1 and 2 in series in a section where they do not exist. This is the same configuration as in the first embodiment. The difference from the first embodiment is that the direction of the conductor is 45 ° with respect to the X axis.

With such a configuration, in the first embodiment, two types of power grid plates, that is, a power grid plate of an X-direction conductor pattern and a power grid plate of a Y direction are required, but in the second embodiment, Can be handled by one type of power grid plates 201 and 202 as shown in FIG. Also in the second embodiment, a resistor 15 for impedance matching is inserted into the connection conductor pattern 13 in the first and second patterns 1 and 2.

Also in the second embodiment, the grid plates 201 and 202 have a wider area constituting a magnetic field having a constant amplitude as a whole. In addition, even if the first and second patterns 1 and 2 are long, impedance matching is achieved.
A constant magnetic field is always generated on the power grid.

[0017]

According to the present invention, as described above, the amplitude of the generated magnetic field can be made uniform over a wide area. In addition, since a resistor for impedance matching is inserted into the circuit of the conductor pattern, impedance matching can be achieved even if the conductor pattern becomes longer. Therefore, even if the device becomes larger and the power supply grid becomes larger, the power supply grid becomes larger. A constant magnetic field is always generated on the upper side, the voltage induced in the power supply coupling coil of the cursor becomes constant, and there is an effect that a highly accurate coordinate position detecting device can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a conductor pattern of a power grid plate of a coordinate position detecting device according to the present invention.

FIG. 2 is a plan view of a conductor pattern of a power grid plate of a second embodiment of the coordinate position detecting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st conductor pattern 2 2nd conductor pattern 3 end connection conductor 4 end connection conductor 5 end connection conductor 6 end connection conductor 8 connection conductor pattern 9 connection conductor pattern 10 connection conductor pattern 11 connection conductor pattern 12 connection Conductor pattern 15 Impedance matching resistor 101 Grid plate 102 Grid plate 201 Grid plate 202 Grid plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A tablet formed by forming a plurality of types of grid-like conductor patterns, a power grid plate for generating an alternating magnetic field having a constant amplitude on a plane of the tablet,
A power supply coupling coil that is mounted on the tablet and couples to an AC magnetic field generated on the tablet to induce an AC voltage; and a rectifying unit that rectifies the induced AC voltage to be a cursor power supply, and A cursor that generates an electromagnetic field by coupling, a power supply circuit that generates a polyphase alternating current to be supplied to the conductor pattern of the power supply grid plate, and a voltage induced in the conductor pattern by the electromagnetic field from the cursor are input. And a processing device for performing signal processing to calculate the planar coordinate position of the cursor, wherein the conductor patterns in the power grid plate are formed by being insulated and stacked on the grid plate. A first pattern and a second pattern, each of the conductors of the first and second patterns being respectively opposite ends , And are connected so that currents in the same direction flow through the conductors of the first and second patterns, and resistors for impedance matching are inserted into the circuits of the first and second patterns. A coordinate position detecting device characterized in that: