JPS6160116A - Tablet input device - Google Patents

Abstract

PURPOSE:To specify the positions of contacts with a small number of scan frequency by setting the 1st and 2nd electrode lines to a tablet alternately in the prescribed number of pieces at the same interval as the segments and detecting the pulses scanned successively by means of a detection means having a contact with the tablet. CONSTITUTION:When a detection pen 12 has a contact with a tablet 11, a pen switch 13 works. A CPU first connects an MPX to a decoder DX1 with supply of a signal PSW and then the address signal AD which varies successively between 0 and 3 at a fixed time interval. Thus the DX1 detects the pulses which scanned successively the line groups 3-6 with the pen 12. These pulses are converted into the digital value accordant with the pulse height by the AD and stored in the prescribed address of a RAM. The CPU extracts the maximum one of signals S3-S6 corresponding to the scans of the 1st line groups 3-6 and and then the maximum and the next maximum ones of signals S7-S9 corresponding to the scans of the 2nd line groups 7-9 to discriminate that the pen 12 has a contact with the level close to the next maximum signal. Then the CPU sends the data TD showing contact areas of X and Y directions to a data processor, etc. via an IO.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tablet input device, and particularly to a companion tablet input device fitK that improves the electrode wire arrangement on the tablet and the pulse scanning method.

[Traditional martial arts]

The applicant previously filed Patent Application No. 2143 in 1982 as a tablet input device that improved the electrode wire connection on the tablet.
No. 01 and Patent Application No. 113442 filed in 1982.

In these tablet input devices, in addition to normal electrode lines for specifying coordinates, an invitation & line for scanning these electrode lines in blocks is arranged to shorten the scanning time.

[Problem that the invention seeks to solve]

But with this traditional tablet input device.

For example, in order to set the segment spacing to 61, in addition to arranging one normal electrode wire at 6-way spacing.

Since it is necessary to place another digit electrode wire in between, it is 1Mi.
The distance between stations, iM, and polar lines is 3, which is half the distance between segments.
As a result, the number of man-hours for pattern creation increases, the difficulty of processing increases, and the shielding effect of the upper electrode increases.
[There was a problem in that the signal level related to the poles was lowered.

[Means for solving problems]

Therefore, in the tablet input device of the present invention, the first electrode wires and the second electrode wires are arranged alternately on the tablet at the same intervals as the segments, and the first electrode wires are arranged every m, and the second electrode wires are arranged alternately at the same intervals as the segments. are connected in parallel every m10 and n (n is an odd number).

Scanning pulses were sequentially applied to these parallel-connected electrode wire groups, the pulses were detected by a detection means in contact with the tablet, and the contact position was determined based on the magnitude of the signal.

[For production]

That is, when different numbers of first electrode wires and second electrode wires are connected in parallel in this way, 1, for example, m = 7,
When n-1, the 1st, 8th,
15th, . . . belong to the same electrode line group, while the 1st, 8th, 1st electrode lines located next to them belong to the same electrode line group.
The 5th wire belongs to different electrode line groups, for example, the 8th wire belongs to the 2nd wire, the 15th wire belongs to the 6th wire, and so on.

Therefore, if each electrode wire group is scanned and the numbers of the first electrode wire group and the second electrode wire group closest to the contact position are determined from the timing of the detection pulse at that time,
From the combination, it is possible to determine which first electrode wire and second electrode wire the corresponding contact position is located between.

〔Example〕

The details of the present invention will be explained below based on illustrated embodiments. 1st
The figure shows an example of the electrode line arrangement in the X direction. In the figure, 1
2 is the first electrode wire, and 2 is the second electrode wire, and to distinguish them, they will be subscripted from A to L in order from the left. (The electrode wires 23 will be described later.) In this embodiment, the first electrode wires 1 are connected in parallel every sixth from the left to form electrode wire groups 3, 4, 5.6, and the second electrode wires 2 is 2 from the left
Every other book is connected to form an electrode wire group of 7°8.9.

FIG. 2 shows an example of a F;I lock configuration. In the figure 11
is a tablet board, and in addition to the electrode wire groups 3 to 9 in the X direction shown in FIG. 1, the electrode wire groups 3 to B of the first electrode wire 1 in the A scanning pulse is supplied to the

DX2. DYl and DY2 are also decoders, and like DXl,
A scanning pulse is supplied to each electrode line group 7-9, 21-24, and 25-27, respectively. AMP is an amplifier that amplifies the scanning pulse detected by the detection pen 12. A/D is an analog-to-digital converter that converts the analog value of the amplified scanning pulse into a digital value. NfPX is a multiplexer that connects each decoder DX1. T)X2. T) Switch and supply address signals to Yl and DY2. The CPU follows the programmed program and makes random access notes! Execute predetermined processing using JRA, M. (2) 0 is an input/output port through which take is exchanged between the central processing unit CPU and an external circuit. Note that in the following explanation, the name of each block will be omitted.

When the detection pen 12 comes into contact with the tablet 11, the pen switch 13 is activated and the signal PSW is supplied to the CPU via 10. OP T, J is this signal PS
In response to the arrival of W, a switching signal O1l is supplied to MPX, and its connection destination is first set as DXl. Next, the CPU supplies address signals A and D whose values sequentially change from 0 to 3 at one fixed time interval to DXI via MPX. 1) Xl follows these address signals A and D,
As described above, the primary scanning pulse is supplied to the nine electrode line groups 3 to B. This scanning pulse is applied to the electrode wire groups 3 to 6 and the detection pen 12.
Detected by the detection pen 12 due to the electrostatic bond between the pen tip of
6 and the signal S is supplied to AMP. An example of the signal S at this time is shown in FIG. In this figure, the vertical axis indicates pulse height H, the horizontal axis indicates time t, and signals S3 to S6 indicate signals S detected when scanning pulses are applied to electrode line groups 6 to B, respectively. This signal S is amplified by the AMP and converted into a digital value according to each pulse height 11 by the AD.

OPU receives this digital value supplied via IO as RA
Store it at a predetermined location in M. Next, OPU switches MPX and supplies address signals A and D to DX2. D
X2 corresponds to each electrode line group 7 to 9 according to this address signal AD.
When a scanning pulse is applied to 1 detection ben 12 as described above,
A signal S is detected. An example of the detection signal S at this time is shown in FIG. In this figure, signals 87 to S9 indicate signals S when scanning pulses are applied to electrode line groups 7 to 9, respectively, and these signals 87 to S9 are also digitally converted and R
It is stored in the predetermined locations of A and M.

Thereafter, in the same manner, the 1st column in the Y direction. Second electrode line group 21 to 27
A scanning pulse is also applied to.

The digital value of the detection signal S (not shown) at that time is RA
It is stored in a predetermined location of M.

Next, the OPU uses the digital value of this detection signal S to
The position where the detection pen 12 is still in contact is determined. The procedure for determining the contact position in the X direction will be explained using FIG. 1, FIG. 3, and FIG. 4. Note that the contact position in the X direction is between the first electrode wire 1 and the second electrode wire.
It is expressed by a combination of subscripts of electrode wire 2. For example, between electrode wire 1 and 26 is expressed as A, A.

Therefore, 1zu OP U is the first electrode wire group 3 to 6 in the X direction.
The digital values of signals 86 to S6 detected when scanning are compared, and the signal S having the maximum value among them is extracted. Third
In the illustrated example, signal S4 is extracted. The fact that the maximum value of the signal is 84 means that the detection pen 12 is in contact with the area Z4 of the electrode line group 4 shown in FIG. Next, the OPU extracts the largest and second signals among the signals 87-S9 detected during scanning of the second electrode line group 7-9 in the X direction. In the example of FIG. 4, the signal Sβ is the largest one, and the signal Sβ is the second one.
7 is detected. The maximum number is 88.

This means that the detection pen 12 is in contact with the range Z8 in FIG. 12 means that they are in contact.

Therefore, from this result, the area where the signal S shown in FIGS. 3 and 4 can be detected is the area where Z4 and Z87 overlap, that is, area BB, which is the contact area of the detection pen 12 at this time. . Note that this area can be specified by previously storing a table as shown in FIG. 5 in R, AM, and applying the above determination result to the table. (In Figure 5, the initial letter S of the signal is omitted).
For area AA, the maximum signal 8 when scanning the first electrode line group
3. Second electrode line group scanning time signal large signal S7. Similarly, it becomes the second signal S8 at that time, and is the same as that in area I)E. Therefore, in this embodiment, as shown in FIG. 1, a dummy electrode 1a2Z connected to the electrode line group 9 is arranged next to one electrode line, and two
So that the th signal becomes 89.

A distinction is made from the area D7'r. In addition, area A
, A is an unused area, there is no need to provide such a dummy electrode 2Z.

The above processing is similarly performed for the signal S obtained when scanning the Y electrode line groups 21 to 27, and the contact areas A A - L L in the Y direction are specified.

Then, the CPU sends data 'r'1) indicating the respective contact areas in the X direction 8 and the Y direction to a data processing device (not shown) or the like via T0.

〔Effect of the invention〕

As explained above, according to the present invention, the contact position of the detection means can be specified with a smaller number of scans than the single-digit electrode force type, and the areas between the electrode lines can be made into independent areas. A tablet input device can be obtained.

Note that in this embodiment, the maximum signal among the signals during scanning of the first electrode line group is used to specify the contact position.

The innermost signal and 2 of the signals during scanning of the second electrode line group
The second one was used, and the one with the largest signal related to the first electrode line group and the second one.

The region can be similarly specified using the maximum signal related to the second electrode line group.

[Brief explanation of the drawing]

The figure shows one embodiment of the tablet input device of the present invention.
The figure shows the arrangement of electrode lines in the X direction, Figure 2 is a block diagram of the device, Figure 3 is a waveform diagram showing the output signal when scanning the first electrode line group, and Figure 4 is the second electrode line group. FIG. 5 is a waveform diagram showing an output signal when scanning the area, and FIG. 5 is a diagram showing a table for specifying the contact area. 1...First electrode line, 2... -Second electrode line. 11...Tablet board 3-7.21-27...
...Electrode line group, 12...Detection means, DXi,
DX2. DYl, T)Y2... Electrode line group scanning means. OPU, ROM, RAM--A contact position determining means.

Claims (1)

[Claims] The first electrode wire and the second electrode wire are arranged alternately in the same direction, the first electrode wire is arranged every m, and the second electrode wire is arranged every m+n.
Every other book, a tablet connected in parallel to form an electrode line group, an electrode line group scanning means for sequentially applying a scanning pulse to the electrode line group, and an electrode line group scanning means that comes into contact with the tablet and detects the applied scanning pulse. A tablet input device comprising a detection means and a contact position determination means for determining a contact position of the detection means based on the magnitude of the detected scanning pulse signal.