JPS58127280A - Co-ordinate reader - Google Patents

Abstract

PURPOSE:To eliminate an error caused by inclination of a co-ordinate indicator, by providing 2 exciting coils and 2 co-ordinate calculating circuits, and correcting 2 co-ordinate values calculated by an induced voltage value of each exciting coil. CONSTITUTION:A controlling circuit 10 alternately selects 2 exciting coils 6a, 6b and 2 co-ordinate value calculating circuits 9a, 9b by an exciting coil selecting circuit 12. The circuits 9a, 9b calculate a co-ordinate value of a position indicated by a co-ordinate indicator, by an induced voltage value induced by the corresponding coils 6a, 6b. In this case, when a distance between a coil 5a and a sense line, a distance between the coils 5a, 5b, a co-ordinate value calculated by the coil 5a, and a co-ordinate value calculated by the coil 5b are denoted as H1, H2, X1 and X2, respectvely, a circuit 13 calculates a co-ordinate value X of a position indicated by the co-ordinate indicator, by X=((H1+H2)/H2).X1)- (H1/H2).X2.

Description

[Detailed Description of the Invention] This Komei has a pen-shaped holder with an excitation coil,
Pen type WI! This invention relates to an S standard reading V device that detects a binding electromotive voltage caused by a symmetry field generated by a heat indicator and calculates an ffl health value.

The imi*indicator in the conventional coordinate reading device has one wJill coil, and the M41i value is calculated from the induced voltage L in the a field generated by this excitation coil.

It is a version of the conventional coordinate reading device shown in Figure 1.
Figure 2 is a diagram showing layers only in one axis direction at 1%.
C is e * 1, the th! - In.

1iJX @ sense line, 2 pieces! Axis sense line selection circuit, black! -Sense Line 4! Axis sense line selection circuit, S is excitation coil, 6 is excitation coil drive circuit, 7 amplification @a is multiplexing circuit, ! 1 is a foot #i value calculation circuit, and 10 is a side guard circuit. The first coil 5 is excited by the excitation coil drive circuit 6, and an alternating current IIm field is generated. The X-axis sense line 1 is selected by the x-axis sense line selection circuit 2, and an induced voltage is generated in each sense line by an alternating 11m field generated by the nine excitation coils. This induced voltage is amplified by the multiplier 1, and the multiplex circuit IK p digital 1
The n value is converted into an ant value. 1III1141 circuit 1G is the above circuit k rb
+1111t, 1cIJ's processing is about Y-axis coordinate sensitivity, Y-axis sense line 2 work! Perform 9 operations in the axis sense line selection circuit w14.

However, in the conventional sitting image reading device, as shown in FIG. This method has the disadvantage that a deviation Mt occurs in the position, and an error r occurs in the coordinate values of the position indicated by the tip of the seat collar holder.

The present invention eliminates the above-mentioned L5 defect hair and coordinates finger? IC6
The purpose is to remove errors caused by the slope of h.
/).

The following describes the M image Idr and the device used in the present invention.
I will explain V in detail. FIG. 3 shows the coordinate reading device according to the present invention. In FIG.
．． ! The axis sense line selection circuit 4, increase #At 17, and quantization circuit 8 are the same as in the conventional sitting image reading 9 acupuncture device.

5a, 5k have two coils according to the invention, 6*, 6
13 is a wJiB coil drive circuit for driving two magnetically moving coils.

9a and 9b are the coordinate value calculation circuits convected to the excitation coil of JtL, and 11 selects the excitation coil drive circuit.
I21W & coil selection circuit, 12 is a coordinate value calculation selection circuit, and 1s is a merging circuit 1. The control circuit 10 includes Ma coil selection (b) jli 511 and coordinate value calculation selection path 12.
Therefore, two excitation coils 6a, 4b and two Nk
41 value calculation circuit? Select turtle and 9b1 alternately. The coordinate value calculation circuit calculates the position of each excitation coil p based on the value of n times the electromotive force induced by the corresponding excitation coil. 11th regular episode [15 is 19. in these two sets of poems 41Ii11i. Outputs the coordinate value kW of the position indicated by the coordinate indicator. Figure 4 is a diagram for explaining the processing performed by the correction circuit.
1t-indicates, H2 indicates rejection between the two excitation coils,
The casing 2x1 is the n coordinate value calculated by the #I foundation coil iaK, and Xl is the n II! coordinate value calculated by the exciting coil sbK. ! 4] III [
The exposure correction circuit calculates X'7 using a linear equation.

As described above, in the present invention, two excitation coils and two coordinates are set at the output j13, and the induced pressure i by each excitation coil is 1.
It has the characteristic that the two sets of coordinate values calculated by m and 9 can be removed by applying a correction circuit to an error τ due to the inclination angle of the coordinate indicator.

[Brief explanation of drawings]

Figure 1 shows a conventional coordinate reading device.
The figure is an explanatory diagram illustrating the errors that occur in a conventional coordinate indicator reading device. Fig. 43 is a block diagram showing the coordinate reading device according to the present invention, and Fig. 4 shows the coordinate reading device according to the present invention. 6 with an explanatory diagram to clarify
/:J. 1...X-axis sense line 2,...XIIIB sense line selection circuit 6...Y
Cap sense line 4... Y-axis sense line selection IR circuit 5.5a, 5b... Excitation coil 6.6a, 4E)... Excitation coil drive circuit 7... Masu @ Rin 8... Quantization Circuit 9.9a, Wb・
...Coordinate value calculation circuit 10...Control circuit 11
... tiJ magnetic coil selection circuit 12 ... Coordinate value calculation selection circuit 13 ... Correction circuit and above Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] A pen deaf seat indicator having an excitation coil that generates an alternating magnetic field, and detects the rust-pressure r induced by the alternating magnetic field and detects the position indicated by the seat indicator. - In the WktlIA reading device consisting of a tablet for calculation, two excitation coils are provided which are alternately excited in the pen-shaped coordinate indicator, and two excitation coils are provided to each excitation coil from a crocodile electromotive force induced by L. The coordinate value of the set [calculated, 1 according to the tilt of the seated image indicator]
a! Correcting the error of the 41 value [Characteristic locus 41 [
gun capture device