JPH0353317Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coordinate detection device for detecting the coordinates of an excitation device such as an electromagnetic pen or a cursor on a tablet.

[Conventional technology]

The coordinate detection device has an X-axis consisting of two conductive wires (sin wire, cosine wire) arranged in a meandering pattern and shifted in phase at the same pitch, and a comb-like conductive wire (selector wire) arranged overlapping these conductive wires. Y-axis wiring consisting of conductive wires with the same configuration perpendicular to these conductive wires is provided, and by positioning an electromagnetic device such as an electromagnetic pen or cursor on the tablet, its coordinates can be detected. do.

Such a coordinate detecting device has the disadvantage that it is necessary to sequentially scan the selector line for each comb tooth, requiring a complicated device and scanning time. To eliminate this drawback,
A device as described in Japanese Patent Application Laid-Open No. 159191/1983 has been proposed. The outline of this coordinate detection device will be explained below with reference to the drawings.

Figures 3a and 3b are wiring diagrams for the X axis. In FIG. 3a, reference numeral 1 denotes first conductive wires arranged in a meandering manner at equal intervals, the pitch of which is indicated by p. Reference numeral 2 denotes a second conductive wire arranged in a meandering manner at equal intervals, and is arranged at the same pitch p as the pitch of the conductive wire 1. The conductive wire 2 is arranged shifted by 1/4 pitch with respect to the conductive wire 1. 12 and 12a are terminals at both ends of the conducting wire 2. Further, in FIG. 3b, numeral 3 indicates a third conductive wire arranged in a meandering manner at equal intervals, and the pitch thereof is indicated by q. 13 and 13a are terminals at both ends of the conducting wire 3. A fourth conducting wire 4 is arranged in a meandering manner at equal intervals, and is arranged at the same pitch as the pitch q of the conducting wire 3. This conducting wire 4 is arranged with a 1/4 pitch shift from the conducting wire 3. 14,
14a are terminals at both ends of the conducting wire 4.

The total length of the conductor 3 arrangement is selected to be equal to the total length l of the conductor 1 arrangement, and
The number of pitches is selected to be one pitch smaller than the number of pitches of the conducting wire 1. Now, if the number of pitches of the conducting wire 1 is n, the total length l is expressed by the following formula.

l=np=(n-1)q Each conductor wire 1, 2, 3, and 4 is insulated from each other while maintaining the relationship shown in the diagram and with the starting ends of conductor wire 1 and conductor wire 3 aligned. and can be stacked.

In such a wiring, it is assumed that the electromagnetic device 6, such as a cursor, is now in the Kth pitch of the conducting wire 1. This position X is equal to the position at a distance s from the reference line of the pitch where the conducting wire 3 is located. Because the electromagnetic device 6 is placed at position
An alternating signal whose amplitude is modulated according to the distance r is induced.

In an arithmetic/control unit (not shown), after integrating the alternating signal induced in the conductor 1 out of the two alternating signals, the alternating signal induced in the conductor 2 is added, and thereby a phase modulation having a phase corresponding to the amplitude is performed. I get a signal. The phase difference between this phase modulated signal and the signal applied to the electromagnetic device 6 is taken out, and this phase difference is converted into the number of pulses _F1 of clock pulses having a frequency corresponding to the pitch p. This number of pulses F ₁ is a numerical value representing the distance r.

In exactly the same way, the voltage induced in the conducting wires 3 and 4 is subjected to the above processing to obtain the number of pulses F ₂ corresponding to the distance s. Of course, this pulse number F ₂ is pitch q
It is obtained from a clock pulse with a frequency corresponding to .

Next, the difference ΔF (ΔF=F ₁ −F ₂ ) between the numerical values F ₁ and F ₂ is determined. This value ΔF is the number of pulses corresponding to position X. The actual coordinates of position X are calculated by multiplying the resulting number of pulses by the resolution per pulse of the clock pulse.

The X-axis coordinate detection has been described above, but the Y-axis coordinates are also detected by placing the same wiring as shown in Figure 1 a and b in a perpendicular direction and using the same method. can do. With such a device, an excellent effect can be obtained that eliminates the need for a complicated scanning device and a long scanning time.

By the way, in the conventional device described above, the detection area has a length np in each axial direction. Therefore, the detection area np can be freely expanded by increasing the pitch number n, the pitch p, or both. However, as the pitch p increases, the distance between the electromagnetic device 6 and each conducting wire increases, the voltage induced in each conducting wire becomes smaller, noise becomes more likely to be mixed in, and furthermore, if the upper limit of the number of detection pulses is a constant value, As a result, the resolution becomes lower and detection accuracy inevitably deteriorates. Further, in a board on which each conducting wire is wired, the number of pitches n is naturally limited in order to arrange four types of conducting wires on both sides of the board without overlapping. Taking these things into consideration, there is a limit to the expansion of the detection area np, and there is a problem in that it is difficult to apply the above-mentioned coordinate detection device to a medium-sized or larger coordinate detection device.

[Purpose of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a coordinate detection device capable of solving the problems of the prior art described above and expanding the detection area.

[Summary of the idea]

To achieve the above object, the present invention provides a first set of wiring consisting of two conductors wired in a meandering manner at the same first pitch, and two wires wired in a meandering manner at the same second pitch. a second set of wires each consisting of two conductive wires, and at least one extension region each consisting of two conductive wires connected at the same pitch to the ends of each set of wires; The electromagnetic device is characterized in that it is provided with an area detection unit that detects the area where the electromagnetic device is located, and the position of the electromagnetic device is calculated based on the induced voltage of the electromagnetic device and the detection signal of the area detection unit.

[Example of idea]

Hereinafter, the present invention will be explained based on the illustrated embodiment with one extension area.

FIG. 1 is a wiring diagram for the X-axis of a coordinate detection device according to an embodiment of the present invention. In the figure, numerals 8 and 9 are insulating substrates, and required wiring is provided on the front and back surfaces of the substrates by, for example, printing. 1A indicates a meandering conducting wire corresponding to the conducting wire 1 shown in FIG. 3a, and has the same pitch p and pitch number n as the conducting wire 1. 1A ₀ ,...1
A(n-1), _1Ao indicates the reference line of each pitch of the conducting wire 1A. 2A indicates a reference line corresponding to the conductor 2 shown in FIG. 3a. 2A indicates a meandering conductor wire corresponding to the conductor wire 2 shown in FIG. 3a, and has the same pitch p and pitch number n as the conductor wire 2. 2A ₀ ...2
A(n-1), 2A _o indicates the reference line of each pitch of the conducting wire 2A.

3A indicates a meandering conducting wire corresponding to the conducting wire 3 shown in FIG. 3b, and has the same pitch q and pitch number (n-1) as the conducting wire 3. 3A ₀ ,...,3A
(n-2) 3A (n-1) indicates the reference line of each pitch of the conducting wire 3A. 4A indicates a meandering conducting wire corresponding to the conducting wire 4 shown in FIG. 3b, and has the same pitch q and pitch number (n-1) as the conducting wire 4. 4A ₀ ,
..., 4A (n-2), 4A (n-1) are conductor wires 4A
The reference line of each pitch is shown.

A coordinate detection area A is configured by the conductive wires 1A, 2A, 3A, and 4A. This coordinate detection area A is the same area as the coordinate detection area shown in FIGS. 3a and b {np=
(n-1). q).

1B is a conductor wire wired with the same pitch p and the same number of pitches n as the conductor wire 1A, and its starting end is connected to the reference line 1A _o of the conductor wire 1A. 1B ₁ ...
...1B(n-1), 1B _o indicate the reference line of each pitch of the conducting wire 1B. The first reference line of conductor 1B (conductor 1
Reference line 1A of A (reference line corresponding to ₀ ) is reference line 1
A _o , and this becomes the reference line 1B ₀ . 2B is a conductor wire wired with the same pitch p and the same number of pitches n as the conductor wire 2A, and the reference line 2A _o of the conductor wire 2A.
Its starting end is connected to. 2B ₀ ,...,2
B(n-1), 2B(n-1), and 2B _o indicate the reference lines of each pitch of the conducting wire 2B. Reference line 2 of conductor 2A
A _o becomes the first reference line 2B ₀ of the conductor 2B.

3B is a conductor wire wired with the same pitch q and the same number of pitches (n-1) as the conductor wire 3A, and the starting end of this conductor wire 3B is the reference line 3A (n-1) of the conductor wire 3A.
It is connected to the. 3B ₀ ,..., 3B(n-2),
3B(n-1) is the reference line of each pitch of the conducting wire 3B, and the reference line 3A(n-1) of the conducting wire 3A is the reference line of the conducting wire 3B.
B's first reference line 3B becomes ₀ . 4B is conductor 4A
The conductive wire 4B is wired with the same pitch q and the same number of pitches (n-1), and the starting end of this conductive wire 4B is connected to the reference line 4A (n-1) of the conductive wire 4A. 4B ₀ ,..., 4B(n-2), 4B(n-1)
are the reference lines of each pitch of the conductor 4B, and the conductor 4A is the reference line of each pitch.
The reference line 4A(n-1) becomes the first reference line _4B0 of the conducting wire 4B.

A coordinate detection area B is configured by the conducting wires 1B, 2B, 3B, and 4B. This coordinate detection area B is an area continuous with the coordinate detection area A, and is the same area {np=(n-1). q}. Conductor 1
A, 1B are conductive wires 2A, 2B on the surface of the insulating substrate 8.
are printed on the back surface of the insulating substrate 8, conductive wires 3A and 3B are wired on the surface of the insulated substrate 9, and conductive wires 4A and 4B are wired on the back surface of the insulated substrate 9 by printing or the like. The surfaces are insulated.

11 is a terminal pulled out from the starting end of the conductor 1A, 11
A is the terminal end of the conductor 1A in area A (reference line 1
The terminal 11B is a terminal drawn out from _the terminal end (reference line 1B _o ) of the conducting wire 1B. 1
2 is a terminal pulled out from the starting end of the conductor 2A, 12A is the terminal end of the conductor 2A in area A (reference line 2A _o )
The terminal 12B drawn out from the terminal 12B is a terminal drawn out from the terminal end (reference line 2B _o ) of the conducting wire 2B. Similarly,
13 is a terminal pulled out from the starting end of conductor 3A, 13A
is the end of the conductor 3A in area A (reference line 3A
The terminal pulled out from (n-1)), 13B is the conductor 3B
This is a terminal drawn out from the terminal end (reference line 3B (n-1)). 14 is a terminal drawn out from the starting end of the conducting wire 4A, and 14A is a terminal drawn out from the terminal end (reference line 4A (n-1)) of the conducting wire 4A in area A. Terminal 14B is drawn out from the terminal end of the conducting wire 4B (reference line 4B (n-1)) This is the terminal pulled out from.

Next, the operation of this embodiment will be explained with reference to the detected numerical value characteristic diagram shown in FIG. First, terminal 1
1, 11B, terminal 12, 12B, terminal 13, 13
B, terminals 14, 14B are connected to an arithmetic/control unit (not shown) of the coordinate detection device. Here, as mentioned above, the coordinates where the excitation device is located are:
It is calculated as the distance obtained from the reference line of each region by multiplying the number of pulses ΔF by the resolution per clock pulse. Then, each conductor wire 1A and 1B, 2A and 2B, 3 arranged in area A and area B
Since A and 3B and 4A and 4B are connected to each other, and have the same wiring structure with the starting and ending points coincident, the characteristics of the detected numerical values in each area are the same. That is, the detected numerical value in the X-axis direction has the same characteristic repeatedly as shown in FIG.

Now, when the electromagnetic device 6 is placed in the position shown in Fig. 1,
A detected value P ₆ corresponding to the position of the electromagnetic device 6 is detected. However, at this stage, the detection value P ₆
It is unclear whether is the value in area A or the value in area B. Therefore, after calculating the number P ₆ , the calculation
In the control section, terminals 11, 11A, terminals 12, 12
A, terminals 13 and 13A, and terminals 14 and 14A are selected, and the presence or absence of a signal between these terminals, such as the magnitude and polarity of the induced voltage, is checked. In the case of FIG. 1, since no signal is detected between terminals 12 and 12A, the numerical value _P6 is determined to be a numerical value in area B. (If a signal is detected, it is determined that the electromagnetic device 6 is in region A). Therefore,
The detected numerical value corresponding to the position of the electromagnetic device 6 is a value obtained by adding the numerical value _P6 to the maximum value Pmax of the detected numerical values in the area A (Pmax+ _P6 ), and this X-axis coordinate value can be obtained.

Note that the coordinates of the Y-axis can also be obtained by configuring the same wiring as the wiring shown in FIG. 1, overlapping them at right angles to each other, and performing the same processing.

With such a configuration, in this embodiment, the coordinate detection area can be expanded to twice that of the conventional one.

In addition, in the above embodiment, an example was explained in which one same wiring configuration is connected and arranged in a conventional wiring configuration, but it is not limited to one, but a plurality of wiring configurations may be used, or the same wiring configuration may be used. It is obvious that wiring configurations that are cut midway may be connected and arranged. Furthermore, in the above embodiment, an example was described in which three terminals are drawn out for each of the four types of conducting wires on one axis, but the present invention is not limited to this. Area determination may also be performed by pulling out a terminal from the end of an intermediate area of an arbitrary set of conducting wires.

[Effect of idea]

As described above, in the present invention, a similar wiring structure is connected and arranged to a wiring structure of four types of conducting wires, so that the coordinate detection area can be expanded.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram for the X-axis of a coordinate detection device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram of detected numerical values of the device shown in Fig. 1, and Fig. 3 a and b are conventional coordinate detection devices. It is a wiring diagram for the X axis. 1A, 1B, 2A, 2B, 3A, 3B, 4A,
4B...Conducting wire, 6...Electromagnetic device.

Claims (1)

[Claims for Utility Model Registration] 1. A first set of wiring consisting of two conductive wires laid in a meandering manner with each having the same first pitch and being out of phase with each other, and each having the same second pitch. A second set of wiring consisting of two conductive wires which are laid in a meandering manner with a phase shift from each other, one of which has the same laying start position and termination position as the corresponding conductor of the first set. a first extension portion of the wiring, which is connected to an end of each conductive wire of the first set of wires and has the first pitch; and each of the second set of wires. at least one extension region configured with wiring of a second extension portion made up of two conductor wires connected to the terminal end of the conductor wire and having the second pitch; a detection unit that detects the position of the excitation device based on a reference;
a switching means for switching the terminal end of each region connected to the starting end of each conducting wire; an area detection section for detecting the region where the excitation device is located by the switching means; A coordinate detection device comprising: a calculation section that calculates the position of the excitation device based on a detection signal. 2. Utility Model Registration Scope of Claim 1. The coordinate detection device according to claim 1, wherein each conductor wire is laid in the extension area in a number of pitches that is equal to or less than the number of pitches in the area.