JPH01209521A - Tablet input device - Google Patents

Abstract

PURPOSE:To decrease the number of component parts of a tablet and at the same time to improve detecting speed for the coordinate positions by combining three types of electrode lines. CONSTITUTION:The 1st electrode lines A of a tablet 27 are connected in parallel at every other {m(m+n)+1} pieces together with the 2nd electrode lines B connected at every other (m) pieces, and the 3rd electrode lines C connected at every other (m+n) pieces respectively. Then the numbers of electrode line groups 1-10 and 11-20 of the electrode lines A-C which are closest to the abutting positions of a signal detecting pen 28 are calculated from the values of the detecting pulse signals detected by the pen 28 when the pulses are successively applied to those groups 1-10 and 11-20. Then it is possible to decide either one of the lines A-C that is closest to the abutting position of the pen 28 based on the combination of the numbers of groups 1-10 and 11-20. As a result, the abutting positions of the pen 28 can be easily fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tablet input device, and more particularly to a tablet input device that employs a capacitive coupling method and improves the electrode wire arrangement of the tablet and the method for specifying coordinate positions on the tablet.

(Prior art VFI) The applicant of the present invention previously proposed a tablet input device that improved the electrode wire connection of the tablet in Japanese Patent Application No. 59-182370.
No. (Japanese Unexamined Patent Publication No. 61-60117), first electrode wires and second electrode wires are arranged alternately in parallel on the tablet at the same intervals as the segments, and the first electrode wires are arranged every .

The second electrode wires are connected in parallel every (m+n) (n is an odd number) to form an electrode wire group, and a predetermined immediate pulse is applied to the indicating means that contacts the tablet and indicates the desired coordinates. We have filed an application for a tablet input device that determines the contact position of the indicating means based on the magnitude of the pulse signal generated in each electrode wire group when applied.

(Problems to be Solved by the Invention) However, in the conventional tablet input device, it is complicated to specify the electrode wires detected by the detection means, and furthermore, the number of parts is increased due to the combination of electrode wires.

(Means to be Solved by the Invention) Therefore, in the present invention, the first electrode wire, the second electrode wire, and the third electrode wire are sequentially arranged in parallel, and the first electrode wire is (m
(m+n)+1) every other book.

The second electrode wire is every m, and the third electrode wire is (m+n)
A tablet connected in parallel every other time to form an electrode wire group, a scanning pulse applying means for applying a scanning pulse to each of the electrode wire groups, and a tablet connected in parallel in accordance with the scanning pulse applied from the scanning pulse applying means. A tablet input device comprising: a detection means for detecting a generated potential; and a coordinate specifying means for specifying coordinates of a position indicated by the detection means on the tablet based on the potential generated on the tablet detected by the detection means. This is what we propose.

(Operation) That is, when different numbers of first electrode wires, second electrode wires, and third electrode wires are connected in parallel.

For example, m=2. When n=1, 1=-1.

1st, 6th, 11th, etc. of the first electrode wire
... belong to the same electrode wire group, the second, fourth, sixth, ... of the second electrode wire belong to the same electrode wire group, and the third electrode 2nd and 5th line.

The 8th ...... belongs to the same electrode line group,
The sixth electrode line of the first electrode line is 1. the sixth of the second electrode wire;
They belong to different electrode wire groups so as to be in contact with the fifth of the third electrode wires. Therefore, pulses are sequentially applied to each electrode wire group, and based on the magnitude of the detection pulse signal detected by the signal detection pen at that time, the electrode wire group of the first electrode wire closest to the contact position of the signal detection pen, the If the numbers of the second electrode wire group and the third electrode wire group are determined.

From the combination, which first electrode wire is the contact position,
It is possible to judge whether it is close to the second electrode line or the third electrode line, and it is also possible to judge whether it is close to the second electrode line or the third electrode line.
The third, second and third electrode lines are the first electrode line, the second electrode line,
Corresponding to any of the third electrode wires, by calculating the magnitude of the potential of the pulse as (1st - 2nd) / (1st - 3rd), the electrode wire near the contact position is The location of the group is detected.

The contact position is determined.

(Example) The drawings show one example of the present invention, and the drawings show one example of the present invention.
The figure shows the arrangement of electrode lines in the X direction of the tablet. Reference numeral A is a first electrode line, reference numeral B is a second electrode line, and reference numeral C is a third electrode line. In this embodiment, the first electrode wires are connected in parallel every fourth from the left to form electrode wire groups 1 and 2.
3.4, 5, and every other second electrode wire is connected in parallel from the left to form an electrode wire group 8, 9, 10. The reference number is No. 1. Second. The distance between each of the third electrode lines is indicated, and the reference numeral indicates the number of the electrode line from the left side of the tablet 27.

FIG. 2 shows an overall block diagram. Reference numeral 27 is a tablet, and electrode wire groups 1 to 1 in the X direction shown in FIG.
In addition to electrode wire group 10, electrode wire groups 11 to 20 having a similar configuration are also arranged in the Y direction. Reference numeral 28 is a signal detection pen that detects the potential of scanning pulses sequentially applied to the tablet 27 from the CPU 21 via drivers 30 to 35. The potential of the pulse signal detected by the signal detection pen 28 is passed through the amplifier 26 and further via the A/D converter 25.

The CPU 21 receives the potential of the pulse signal detected by the signal detection pen 28 as detection data. The CPU 21 also uses data tables TABLEI and TAB for detecting the position where the signal detection pen 28 is in contact with the tablet 27.
LE2. ROM22 that stores TABLE3, and ADMAX, AD2ND, and AD3R that store detected data and electrode line group numbers of the detected data when the program is executed.
D, LNMAX, LN2ND.

r=N3ttD, XWKI, XWK2. It is also connected to a RAM 23 for use as a work area for X and an interface 24 for connection to a host computer or the like.

An example of the operation of the present invention will be described using a flowchart of position detection in the X direction. First, apply CP to electrode wire groups 1 to 10.
A J@th pulse is applied from U21 via drivers 30 to 35, and the potential of the pulse signal detected by signal detection pen 28 in contact with tablet 27 is transferred via amplifier 26 and A/D converter 25. The obtained detection data and the maximum value at that time are stored in the RAM 23. (Step 1) If among the data detected by the signal detection pen 28 from the electrode wire groups 1 to 10, if the detected potential of the top three electrode wire groups is less than a certain reference value data, the signal detection pen 28 detects the data on the tablet 27. If it is determined that there is no contact, step 25
), performs various error processing (step 26), and ends. If it is determined that the signal detection pen 28 is in contact with the tablet 27, the process proceeds to step 2. R in step 1
The maximum value of detection data stored in AM23 is stored in RAM2.
In step 2), the number of the electrode line group at that time is stored in (LNMAX).

(Step 3) Similarly, store the second largest detection data in (AD2ND) of the RAM 23. Step 4)
The number of the electrode line group at that time is stored in (LN2ND) (step 5). Also, the third largest detection data is R
The number of the electrode line group at that time is stored in (LN3RD) (step 6).
Step 7).

Next, the detection data stored in steps 2 and 4.6 is calculated as (maximum value - 2nd)/l maximum value - 3rd),
Furthermore, the signal detection pen 28 is multiplied by 172, which is the distance between the electrode lines on the tablet 27, and stored in (XWK2) of the RAM 23 (step 8).
The distance from the contact position on 7 to the nearest electrode wire group is calculated.

Next, it is determined whether the number stored in (LNMAX) of the RAM 23 belongs to the electrode line A, B, or C (step 9). If it belongs to the electrode line A, then R
The number stored in (LN2ND) of AM23 is B,
It is determined which electrode line of C belongs to (step 10). Similarly, if the number stored in (LNMAX) of the RAM 23 belongs to the electrode line of B,
The number stored in (LN2ND) of RAM23 is A,
It is determined which electrode line of C belongs to (step 11), and if the number stored in (LNMAX) of the RAM 23 belongs to the electrode line of C, the RAM
It is determined whether the number stored in (LM2ND) of No. 23 belongs to the electrode wire A or H (Step 1
2), in step 13, from steps 9 and 10, RA
The number stored in (LN3RD) of M23 belongs to the electrode line C, and it can be determined that the signal detection pen 28 is located slightly closer to the electrode line B than the electrode line A.
(XWK 1
is stored in In step 14, in step 13, RA
Multiply the L number stored in (XWK 1) of M23 by the distance between the electrode lines on the tablet 27, and add the result and the value stored in RAM 23 (XWK, 1) in step 8. , the signal detection pen 28 is connected to the tablet 27
The position of the X coordinate that is in contact with the top is determined, and the
(X) and ends. In step 15, it is determined that the number stored in (LN3RD) of the RAM 23 from steps 9 and 10 belongs to the electrode line B, and that the signal detection pen 28 is located slightly closer to the electrode line C than the electrode line A. Yes, RAM23 (LNMAX), (LN2ND)
The calculation result is allocated to the ROM 22. From the data table TABLEI, find the number L of the electrode wire from the left side on the tablet 27,
RAM23 (XWKI)L: Stored. Then, in step 16, in step 15, the (XWK
1) Multiply the L number stored in step 8 by the distance between the electrode wires on the tablet 27, and use the result to calculate R in step 8.
The X coordinate position where the signal detection pen 28 is in contact with the tablet 27 is determined by subtracting the value stored in (XWK2) of the AM 23, and is stored in (X) of the RAM 23, and the process ends. In step 17, from steps 9 and 11, R
The number stored in (LN3RD) of AM23 belongs to the electrode line C, and it can be determined that the signal detection pen 28 is located slightly closer to the electrode line B, and the number stored in (LNMAX), ( LN2ND) is calculated, and from the data table TABLE2 assigned to the ROM22, the number L of the electrode wire from the left on the tablet 27 is calculated, and
). Then, in step 18, step 1
Step 7: Multiply the L number stored in (XWKI) of the RAM 23 by the distance 11D between the electrode lines on the tablet 27, and subtract from the result the value stored in (XWK2) of the RAM 23 in step 8. The X coordinate position where the signal detection pen 28 is in contact with the tablet 27 is determined, and the
23 (X) and ends. In step 19, it is determined that the number stored in (LN3RD) of the RAM 23 from steps 9 and 11 belongs to the electrode line A, and that the signal detection pen 28 is located slightly closer to the electrode line C than the electrode line B. Yes, RAM23 (LNMAX), (LN2N
From data table TAB LE2, which is calculated with D) and allocated to ROM22 based on the result,
The number L of the electrode wire from the left side on the tablet 27 is determined and stored in the RAM 23 (XWKI). and,
In step 20, in step 19, the RAM 23 (XWK
Multiply the L number stored in I) by the distance between the electrode lines on the tablet 27, and the result is stored in the RAM in step 8.
By adding the value stored in (XWK2) of 23, the X coordinate position where the signal detection pen 28 is in contact with the tablet 27 is determined and stored in (X) of the RAM 23, and the process ends. In step 21, from steps 9 and 12, RA
The number stored in (LN3RD) of M23 belongs to the electrode line B, and it can be determined that the signal detection pen 28 is located slightly closer to the electrode line A than the electrode line C.
LNMAX) and (LN2ND) are calculated, and based on the result, the electrode wire number L from the left side on the tablet 27 is calculated from the data table TABLE3 allocated to the ROM22, and the number L of the electrode wire from the left side on the tablet 27 is calculated.
is stored in Then, in step 22, step 21
Multiply the L number stored in (XWKI) of the RAM 23 by the distance between the electrode lines on the tablet 27, and add the value stored in (XWK 2) of the RAM 23 in step 8 to the result. The X coordinate position where the signal detection pen 28 is in contact with the tablet 27 is determined.

It is stored in (X) of the RAM 23 and ends. Step 2
3, from steps 9 and 12 the RAM 23 (LN3R
The number stored in D) belongs to the electrode line A, and it can be determined that the signal detection pen 28 is located slightly closer to the electrode line B than the electrode line C.
N2ND), and the result is used in ROM2.
From the data table TABLE3 assigned to 2, the number L of the electrode wire from the left side on the tablet 27
is calculated and stored in (XWKI) of the RAM 23. Then, in step 24, (X
Multiply the L number stored in (WKl) by the distance between the electrode lines on the tablet 27, and subtract from the result the value stored in (XWK2) of the RAM 23 in step 8.
X where the signal detection pen 28 is in contact with the tablet 27
The coordinate position is determined and stored in (X) of the RAM 23, and the process ends.

(Effects of the Invention) Since the present invention has a diagonally upward configuration, the number of component parts of the tablet can be reduced and the coordinate position detection speed can be improved by combining three types of electrode wires.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an X-direction electrode line arrangement diagram, FIG. 2 is a block diagram, and FIGS. 3 to 5 are flowcharts. 1-10.11-20... Electrode wire group, 21...
...CPU, 22...ROM, 23...
...RAM, 25...A/D converter, 2
6...Amplifier, 27...Tablet,
28...Signal detection pen, 30-35...
・Driver, A, B, C... Electrode wire

Claims (1)

[Claims] The first electrode line, the second electrode line, and the third electrode line are sequentially arranged in parallel, and the first electrode line is {m(m+n)+1}
Every other book, every m second electrode wires and every (m+n) third electrode wires are connected in parallel to form an electrode wire group, and a scanning pulse is applied to each of the electrode wire groups. a scanning pulse applying means for applying a scanning pulse; a detecting means for detecting a potential generated on the tablet in response to the scanning pulse applied from the scanning pulse applying means; and coordinate specifying means for specifying coordinates of a position indicated by the detecting means on the tablet.