JPS60134324A - Coordinate reader - Google Patents

Abstract

PURPOSE:To read writing data of a graphic, etc. with high accuracy by providing a medium of prescribed thickness by a nonmagnetic material on a detecting scanning board. CONSTITUTION:A magnetic field is generated in a coordinate indicator by a signal from a controlling circuit, and a calling-on signal is generated on a detecting scanning board 1. This detecting scanning board 1 is scanned by an X and Y direction scanning circuit, an operation for detecting a position of a scanning line and determining a coordinate value is execured, and its data is obtained. Said magnetic field is generated by sense lines SLa-SLc consisting of a coil of the detecting scanning board 1, and this magnetic field is detected by a coil 4a of the coordinate indicator. In this case, a medium M of a prescribed thickness D is provided by a nonmagnetic material on the detecting scanning board 1, and even if the coil 4a is inclined theta, a distribution of a magnetic flux is equalized, and the accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a coordinate system that can output highly accurate coordinate values even when the pen-shaped seat edge indicator is handled with respect to the inclination of the pen-shaped seat edge indicator when the pen-shaped coordinate indicator is used to mark down the map. This relates to a reading device.

FIG. 1 is a block diagram showing the coordinate reading device, in which 1 is a detection scanning board, 2 is an X-direction scanning circuit, 3 is a Y-direction scanning circuit, 4 is a coordinate indicator, 5 is an oscillation circuit, and 6 is a cylindrical control. circuit, 7
8 is an amplifier circuit, and 8 is an arithmetic circuit. The operation is such that an oscillation signal is output from the control circuit w-6 to the oscillation circuit 5.
drives the coordinate indicator 4, and the coordinate indicator 4 generates a magnetic field,
A guiding signal is generated on the detection scanning board 1. The X-direction scanning circuit 2 and the Y-direction scanning circuit 6 scan the detection scanning board 1 from X to xn.
The signals are scanned alternately from Yl to Yn, and the generated signals are sequentially sent to the amplifier circuit 7. The amplifier circuit 7 performs waveform shaping and quantization on the input signal, and then sends the signal to the control circuit 6 and the arithmetic circuit 8.
Output to 1. Performs calculations to detect the position of each scanning line and determine coordinate values, and outputs the data. Since the electromagnetic induction method is used to detect the position of the coordinate indicator 4, as shown in Fig. 2) and (b) K, the excitation coil 4a built in the coordinate indicator 4 is By tilting the indicator 4, the position of the excitation coil 4a always changes according to the inclination angle θ, so Va, -Vb, and V shown in FIG. 2(b)
c is guided to each of the sense lines 8La, SLb, and SLc, and the coordinate q including the eye difference cannot be calculated, making it impossible to detect the normal coordinate p.

The present invention has been made in order to alleviate the above-mentioned drawbacks of the conventional device, and its gist is that a non-magnetic material with a certain thickness is placed between the coordinate indicator and the detection scanning plate. so that the ratio of the induced voltage generated on the detection scanning board is not much different between when the coordinate indicator is in the vertical position and when it is in the tilted position, so that the error in the arithmetic circuit output data is small. The purpose of the present invention is to provide a coordinate reading device that allows the following.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a comparison of one embodiment of the present invention, and SLa, SLb, and SLc shown in the figure are sense lines made of coils for detecting magnetic flux generated by the coordinate indicator. M
This is a medium placed on the scratch detection scanning board 1, and has a constant thickness D. The magnetic flux distribution and each sense line Sla, SLb when the coil 4a of the coordinate indicator is arranged at an inclination angle θ on the scanning plate 1 with the media M interposed therebetween.
Induction 'IF, FlEVa', Vb' occurring in SLc
, Vc'.

Although the coordinate indicator is tilted, because of the presence of the medium M, the distribution of magnetic flux becomes uniform, and the calculation result shows a value close to the coordinate value of p, such as Vc' in va'.

As explained above, according to the present invention, in a coordinate reading device using an electromagnetic induction method, coordinate values are tilted by providing a non-magnetic medium with a certain thickness on the detection scanning plate. It is also possible to obtain values close to the true data. Therefore, there is no time limit for the operation of the coordinate indicator, which reduces the mental pain of the operator and, as a result, has the effect of improving the overall accuracy of written data such as characters and figures.

The certain thickness D of the media M means the pitch L of the sense lines that detect the magnetic field, and the inner diameter R of the coil of the coordinate indicator 4.
When is the distance H from the center of the coordinate indicating coil to the recording surface, then L:8:R-8=H.

It refers to a value that is 0.5 to 1.5 times R4 or H.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional coordinate reading device, and Figure 2 is (
a) and (b) are explanatory diagrams showing inclination errors, and FIG. 3 is a side view for explaining the effects of the present invention. 1...Detection scanning board 2...X direction scanning circuit 3...Y direction scanning circuit 4...Coordinate indicator 5...Oscillation Circuit 6...Control circuit 7...Amplification circuit 8...Arithmetic circuit 4a...Excitation coil SLa, b, c...Detection coil Person Seiko Electronic Industries Co., Ltd. Agent Patent Attorney Mogami Kawakadeda Figure 1

Claims (1)

[Claims] A coordinate reading device using an electromagnetic induction method, characterized in that a medium of a constant thickness is positioned between a coordinate indicator and a detection scanning plate to reduce errors in coordinate values due to the inclination of the coordinate indication.