JPS5943489A - Electromagnetic induction type digitizer - Google Patents

Abstract

PURPOSE:To prevent the influence of an installation place and the influence of an external noise and to enhance the precision, by calculating a coordinate position on a basis of the distribution state of an electromotive force generated in an induction coil. CONSTITUTION:Plural conductors 1- are arranged at intervals of a certain length on an array board, and all conductors 1- have one ends connected and short-circuited and have the other ends connected to switches M1-Mn for every prescribed number of conductors. Outputs of switches M1-Mn are connected alternately and become the input signal of an amplifier A. Consequently, the electromotive force induced in the loop constituted with two conductors is inputted to the amplifier A. Switches M1-Mn and conductors are switched successively to input the output of the amplifier A to a sample holding circuit SH, and the output is inputted to a microprocessor MCP through an AD converter AD, and the position of the induction coil, namely, the center position of the coil is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a digitizer based on Equation 11 for calculating induced current distribution.

Typical conventional electromagnetic induction digitizers include a coil that excites an alternating magnetic field, and two sets of grid-like conductors, X and Y, which induce an electromotive force. Excitation = Fill-C: 1 curvature) Lux (σ1 pen-fold 'f'i-1'!: ÷ is housed in m
ill's grid conductor liY'! 'll17'' inini r
/User i5, perpendicular shape 〒'board'ri; dead 4l-
(-iiii;], 1, -, (I[: 2nd lead fp to A (i”; beg 1
．． l: 4 uA Zl"'('
8 lead IJ without adjacent! li] - (- Luo) Connect the upper part of the cursor and add the number I-"l to the excitation block in the cursor.
lz ~ number Mllz of 7 (j.

1 kurazu-・actual size, )=, 31st 18A: ill combination (・'
The electromotive force is induced from the loop at l, /, /, to the excitation coil (Kurzl).11. ．． 2) Be able to know the location.

, 1. I(1', Noff method (this 1-(I is the position reading capacity QJ:, loop interval 111i1-) is limited by the dimension between the conductors. Sa)-
(As the first row of the first row, knee)'s guiding thread treasure! jyf ya,
Loop or cliff part -] Place sea 2 on the top board so that it is small,
tTJhaJj(,:, :'IlIl magnetic field always makes the loop (combined 8
Two loops) occur 't inducing an electromotive force /:,) from the roots of Atre, - Ino I ☆ place - know, two and ga ma, - eight loops (koin) t-1,' ,) By changing the position of J, the ratio, etc., it is possible to know the position of Iyama i14 between the two lines.

In addition, in the above processing, the excitation of the magnetic field is performed using the lattice-like channel of the board. - ■ No, raise 7 [l be..

ni-no' niunatishita 1su&'J1, jIJ force・r
The electromotive force produced by the coil (this, I, and the other, 1.return) curve is J! Measure the value - J′ruζ1↓
(2) Since the digitizer is used to obtain three values, measurement errors may occur depending on the location where the digitizer is installed, or measurement errors may occur due to external noise. (Material or pen) loop: There are problems such as a difference in C1 depending on the height from the file and the gap, V), and the need for fine adjustment7. This invention IJ1, This is based on the above-L problem,
Since the jill fixed position is extracted from the absolute value of C(), the coordinate position is calculated from the distribution state of the electromotive force. 1.96 In 17, it is possible to use a high-precision electromagnetic induction type digitizer without being affected by the installation location or external noise. -J- is in it.

First, the measurement b'd of this invention is attached to the left-'
) and 1, (translationally, as shown in Figure 1.1 (C), an electromotive force of 1lfI is generated by the general digit excitation coil.), and the loop is 1° +
, l l)... has many duplicates and is 2 and is l'i81
"W'j" is 54 leaked.This position detection spirit (
・, 1. The higher the overlap density of loops per application area, the higher the number of loops.
・) A8, j, gate - is -LJ 3°1-7.1[
A J″ board (this is set as 1,
When the excitation coil is placed on the board 4', an electromotive force is induced in the excitation coil, and an electromotive force is induced in the excitation coil. City, Kogai [
j('yo, 'Pr'2 As shown in Figure 1, excitation 711
Symmetrical t, - with Lucy 1 as the center, which corresponds to Le.
Q L, which becomes the C curve. The position of the excitation −l generated between the centers of the loop 7 can be calculated as follows. Ru.

DJ'J, ij) "Ile position, i.e. 7b for induction,
Place the can that has the greatest power.
Each loop I(' 3.・(JRUKI1t!,
Since υ(-1) is distributed in the composition, iN'b(separation (rJ, etc.) from position X +) to a specific electromotive force, ij and (
(-5 Shiri, the position X\ of a certain loop and the symmetrical position (here j') Ai'.

The position of the other virtual loop
Fortune telling. -, that is, as shown in Figure 3 a, the 7th position of the attention loop on the descending side of the curve is
The position of the virtual loop on the upper row side of the curve at the position
yshi2, 71 power of both A, a-1! l"ru.

The position of the loop which is on the curve 1-ascending law and whose electromotive force Is becomes I′S ｼA＼ｼｼｼｼｼｼｼｼｼｼｼｼｼｼ＼＼＼＼＼＼＼＾ｼｼ＼＼＼＼ｼ＼＼＾ｼｼ＼＼＼＾＼＾ｲ], this Luso is close to Th and its electromotive force C becomes C｜ﾞﾞXlI41
1, the distance between these loops is ((, position
If the distance between n and X'X is IJ-, then the following equation holds true.

q: C-13 Uni r: A-RA -
I B ,', l' =c---1. ．． -(1...
(1)X'x = Xn 10r...
...) Also, the position of the excitation coil P,
No.-Uni--B-q) ・” (
3) Similarly, at 17, as in Figure 3 1), point Xx and X
'x to J! 1 in y town is -XI [-\"-=-"-(+, + X'n = X
n −r ′); 2 Δ−−13 = ′ (XX +Xn −−−−−1−−−q)
-9, (4) 2(, -- Summer λ Even if we go to the case of 1 page and 19゛, there are three loops σ
-) By setting the electromotive force to 11111, set f1' which is the maximum of the electromotive force (excitation -I N11: set)
If f7ji is not at the maximum of the loop, the detailed position of f7ji can be known even if there is collaboration between 1411-f- and loops.

Next, the configuration of the present invention will be explained in detail with reference to the embodiment shown in Figure 17ti.

284 As shown in Figure 284, the array board has multiple conductors 1,
... are arranged at regular intervals, and all 5!
'1-line 1.・・・ii-・The end is connected to the J-to C, and the other end is the predetermined number of wires 4U-, and the switch M is used to select one wire from multiple wires like a Marubuplexer etc.
, + , M2.

Ma...He stone is red-faced. Each switch~h
, M2... are connected every other output? N, that is, the output of the switch M+, Ms... of the southern number counter [] and the even number +1
The outputs of the four switches RN"2+ to 14 of 7F-I are connected to each other, and serve as input signals to the amplification circuit.

The above switching devices t'vl+, L・12... are Microbe I-4729-Ni1) C: i. Two switches that are in contact with each other are selected, and the two selected switches are Lines of force at the same position on the switch (if the conductor of one switch is the 11th from the 1st side of the switch, the conductor of the switch of the other switch is also on the left side 1] [1) or rl': is selected.In sub-1), the electromotive force induced in the loop formed by the two conductors is inputted to the amplifier.In this way, the switching vessel 1v
By sequentially switching the force lines f+, ~12, ..., the peak value of the electromotive force of the loop formed by the conductor wires (dl, Fig. 2 1) is distributed.The output to the above amplifier is is converted into a digit by the microprocessor MPC so that the peak j17j of C1 is converted into a digit by the converter AI) by the converter AI) by the converter AI), and then by the microprocessor MPC, the above (,3), 戊 or ( - According to equation 1), the position of the excitation coil, that is, the upper center of the coil, is calculated.

1,,i:F,・,Microphone [KozorosetsuzaMI'C manually inputs the peak value of the selected coil, selects the next switch or conductor 1, or selects this selection. First, each switch MI, \1i..., etc.
-J-, and then connect it to the switch, ++, Fih
...I:i+'i is missing,,'+(:I'm going to make a stream,
j) When the peak value due to the loop of the conducting wire selected 7 becomes less than the predetermined value, the selector's ]j9 gland is also sequentially selected]5. Iru's position, Nanano,
You can read the fortune between jlp1.

1.'(The other side of this invention is shown in FIG. 5, and this is explained. 1.lJJ 1-1C11 is the same as that shown in FIG. 4, but the number of switching devices is reduced. The processing speed has been improved and the processing speed has been improved.

As shown in Figure 5'), there are multiple snow lines 1. . . . is a predetermined number of 1 group and 1 to n1 cruise G+.

2. ...Gm, one end of each group's conductor V
, the number is 41Σ17-ko ・/3-7.This number is the +1 conversion of
It is connected to the input terminal of N2. Switcher N+ i-bow, group +, 2, Gry+, -+, switcher N2, cruise C, 2, 3... (yni are connected sequentially,゛NIPC
When operating the circuit Lj-, the cutter N+, N2 rJ,
Same 11. 'j jC is activated, so that the adjacent group is always selected) N4 -). These two switch N
1. Outside the output of N2, the output of the amplifier A1 is connected to the input switch S1, and is also connected to the selector switch S1. Group G+, nia,...
Conductors in the same position (in each group):, from the side [
The other ends of the force lines located at -1 are all connected to the input terminals of the switch N3. Similarly, the even number h' , F1-1, the conductors of groups G2, G4, etc. are also connected to the switch N4. Therefore, the microprocessor operates the switches Ns, Ns at the same time (, This is 7
Switchers N3 and N4 always connect the conductors at the same position for each cruise (from the control to L and C).
fl[1 conductor) is selected. , these two switchers N3 and N4 output 12, amplifier A2
11:N-) and is connected via a selector switch S2. ) 1-Sub amplifier △1. A2 is connected to the L-C sample bold circuit Sll via the changeover switch S3, so when the first contact Sa of the changeover switch S3 is closed, the output of the amplifier A1 is manually input to the sample hold circuit S11. When the second contact Sb is closed, output 2 is manually supplied to the amplifier. This sample bold circuit SL-C
CJ:, the peak value of the electromotive force manually applied from either amplifier A+, 8, 2 is detected, and this peak value is /~
-L) converter ■], the microprocessor MPC converts the above equation (3) or k
J and C calculations are performed using equations (4) to determine the position of the excitation coil.

Next, to explain the control example of the second embodiment shown in FIG. 5, in the first stage, the changeover switch S+ opens the contact,
The changeover switch S2 closes the contact, and the [L changeover switch 5
s (rl first contact Sa is selected, switch N3
, N4 selects an arbitrary position and stops. In this state, the switch N1. Activate N2 and add + to the group
, G2..., select the group with the maximum electromotive force, and switch to 'A'.
; Select and hold the largest group in Nl and N2.

;J4!7; In the second stage, selector switch SI is set to J.
: The contact is closed, the changeover switch S2 opens the contact, the changeover switch S3 selects the second contact SL), and the changeovers N1 and N2 remain in the above state. In this state, the microprocessor MPC sequentially switches the switches Ns and N4, and the position of the excitation coil can be calculated from the above equations (3) and (4) and the addresses of the switches N+ and N2. Note that depending on the position Xp of the excitation coil, the switches N+ and N2 are switched to select the group located adjacent to the group currently being selected and held, and the calculations based on equations (2) and (3) are performed. Sometimes it helps.

In addition, in the above example, an alternating magnetic field was generated in the coil provided in the curloon (including the pen), or an alternating magnetic field was generated in the selected loop coil, and the induced electromotive force was detected with the coil provided in the kernel. You may be able to do it.

As shown below, this function calculates the position of an arbitrary loop coil and a virtual loop coil that has the same detection value as this loop coil, and sets the cursor (including Ben) to the
Since the position of the cursor coil is found, the position of the cursor coil can be easily detected. In addition, the loop coil installed on the panel 1 is made of conducting wires arranged at a constant pitch, and each conducting wire forms a loop, which simplifies the structure of the array and increases the detection speed. -There is an advantage that

In addition, instead of calculating the coordinate position from the absolute value of the electromotive force generated from the excitation coil to the induction coil as in the conventional example, the coordinate position is calculated from the distribution state of the electromotive force. The influence of the location and the influence of external 7 noise are generated in each loop and canceled out, so the accuracy is very high without being influenced by the outside. Since C is not required, the circuit can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a loop coil for detailed explanation of the present invention, Fig. 2 a, 1] is a graph showing current distribution,
3a and I) are graphs showing the principle of this invention, FIG. 4 is a block diagram showing one example of this invention, and FIG. 5 is a block diagram showing the other side of this invention. 1...Conducting wire, A, A+, A2...Amplifier,
A I-)...8-D converter, M+, M2,...
...N+, N2...switcher, SH...sample hold circuit, MPC...microprocessor, S+
, S2, Sa...changeover switch. Special W “Applicant Oskon Miko Co., Ltd. Sekido Agent
Sickle H'' Sentence 2 Procedural Amendment (Master) l ・li l'lσ) Hand 11.41 Japanese 57 a) Intestine - Hu 1 No. 154258 So 25
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``I'''' ■ C C [, 2) 1 Ra no L - ゛ between σ input 1 all ``This T also loops Xr1 and Xn+l,,l
: Between (1,, + j i + this + J? is supported. 3, Ibid. 1:30, 1st line 4. Drawing σ] The first is I and Figure 5 on the separate sheet.

Claims (1)

[Claims] (1) In a digitizer equipped with a loop coil provided on a panel and a movably provided TJ moving coil, a chair J between the ITJ moving coil and the selected loop coil is used.
A means is provided for passing an alternating current through one of the coils to thereby excite an alternating magnetic field, and a means for detecting the induced alternating magnetic field on the other side is provided, and the loop coil at a certain position exhibits the same detected value as this loop coil. An electromagnetic induction digitizer which is provided with arithmetic means for determining the position of a virtual loop coil and calculating an in-N' device of a moving coil. +z+ 1. The loop coil provided on the recorder 1 is a plurality of conductive wires arranged at a constant pitch, one end of all the conductive wires is connected and short-circuited, and the other end of the conductive wire is connected to -
・It is characterized by connecting the fixed number of switches to the input 'l: +i of the switch, selecting 2.2 switches in sequence, and selecting a conductor from each of the selected switches to form a loop. Patent ijl'l Jζ(tsu': I-encircle, electromagnetic induction type tie described in paragraph 1→J'. With the conductor (tsu,
Group a certain number of these conducting wires and connect them so that one end of each wire is short-circuited.11-4. , I.J.
! In addition to each group, connect the conductor at the same position of each group to the input terminal of the device.
L and 2nd each. The third switch K(ko) Me L,
'R1'n-1'; ff )J characterized in that two adjacent loops are selected from the first switch, and a conductor is selected and looped from the switch to the second and third switches.
The electromagnetic induction digitizer 1 according to item 1.