JPS58127275A - Electromagnetic induction type co-ordinate reader - Google Patents

Abstract

PURPOSE:To raise a sense line loop in case of scanning the whole surface to 5 times of a usual one, to shorten a detecting time of a position indicated by a coordinate indicator, and to obtain an exact co-ordinate output, by providing 2 parallel electric conductors forming an optional sense line, and a selecting circuit. CONSTITUTION:In accordance with a scanning address signal from a controlling circuit 11, 2 sense lines S0 and S1, S1 and S2- are selected in order by a selecting circuit 12, a sense line loop is formed, induced voltage generated in its sense line is converted to a digital value by a quantizing circuit 15, and a co-ordinate value is generated by an operating circuit 16. Subsequently, the sense lines S0, S1 and S1, S2- in case of scanning the whole surface are selected by 5 units such as the sense lines S0, S5, S10-, and a sense loop of 5 times of a usual one is formed. By forming the sense loop of 5 times in this way, the whole surface scanning time is raised, a detecting time of a position indicated by a co-ordinate indicator 13 is shortened to 1/5, and an exact co-ordinate position is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic induction type coordinate reading device that speeds up the start of coordinate generation when inputting position information to a coordinate indicator in a coordinate reading device. be.

As shown in Figure 1, the conventional electromagnetic induction type positioning and marking system* has multiple sense lives X1 on the X and Y axes.
A selection circuit 2 that sequentially scans X@, ``In and Y, , Y, , -Y!l into a scanning atresm from the control circuit 1, and a coordinate indicator 5 that generates an alternating magnetic field and its state. a quantization circuit 5 that amplifies the induced voltage generated on the sense line by the coordinate indicator S and converts it into a digital quantity, and an arithmetic circuit that generates 19 coordinate values for the digitized induced voltage and the scanning address at that time. 6. This conventional device has a scanning address sent from the control circuit 1 to the selection circuit 2. 1 and sequentially scan the sense fins to detect the position of the coordinate indicator, and when the -1 position is detected, from now on, only several sense lines on the right and left are scanned around the above detection point to generate coordinates. Engineering (known) The former is called full scan and the latter is called partial scan, but when you start using a coordinate indicator, first detect the approximate position of the coordinate indicator by full scan, then repeat partial scan to generate coordinates. It is something. In full-scale scanning, as mentioned above, the sense lines are sequentially scanned, so it takes time to detect the position of the coordinate indicator, that is, the scanning start point for moving to partial scanning, and the coordinate indicator must be used at a certain speed. In this case, the scan start point is detected a little later than the initial position actually indicated on the coordinate indicator, and the coordinate values generated by the arithmetic circuit are slightly off from the actual position. It had

In order to eliminate the drawback of the first conventional circuit, the present invention has a second feature.
By using the sense line structure, selection circuit, and control circuit shown in the figure, the object is to speed up the detection of the scan start point in full-surface scanning. An embodiment of the present invention will be described in detail below with reference to FIG. The sense lines in FIG. 2 are shown with x@O and K for convenience of explanation.

Using the scanning address signal sent from the control circuit 11, the selection circuit 12 sequentially selects two senses @8. and 5ly81 and Ell
... is selected to form a sense line loop, and the pressure generated on the sense line is converted into digital violet by the quantum circuit 15 and sent to the arithmetic circuit 16! Generate jl coordinates. Here, the feature of this circuit is that there is scanning during full-scale scanning, and during full-scale scanning, the sense selection is B. and 8 seconds.

B1 and 8th breath... In other words, form a 7th loop that is 5 times the normal number, and if the coordinate indicator is not detected within that loop, select the center loop (for example, sense Isn and If it is a loop formed by Pi, the loop formed by senses 418m and 83) is used as the scanning start point, and partial scanning is started to start coordinate generation.

As described above, the coordinate generation after the tit partial scan of the present invention is the same as that of the conventional device, but according to this embodiment, the sense line loop during the entire surface scan is performed in a loop that is 5 times the normal loop.
x b, the overall scanning time can be increased five times. Therefore, the present device has the effect of reducing the time required to detect the position indicated by the coordinate indicator to Q115 in the conventional method, promptly starting coordinate generation, and outputting more accurate coordinates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional device, and FIG. 2 is a block diagram showing an embodiment of the present invention. 11... Control circuit 12... Selection circuit 15...
・Coordinate indicator 14... Coil electric circuit 15...
Quantization circuit 16...Arithmetic circuit and above Applicant Daini Seiko Co., Ltd. Representative Patent Attorney Level 1v! I

Claims (1)

[Claims] A selection circuit that sequentially selects two groups of parallel conductors that are orthogonal to each other on the same plane, that is, a sense line and a sense life one by one; a sense circuit that is a new sense circuit; a coordinate indicator having a coil that generates an alternating magnetic field; and a coordinate indicator. a coil drive circuit that drives the coil, a quantization circuit that converts the induced voltage generated on one sense line in the coordinate indicator into a digital quantity, and a control circuit that determines the scan address for selecting the sense line and sends it to the selection circuit. In the electromagnetic induction system, which is composed of an arithmetic circuit that generates coordinate values based on the digitized induced voltage that passes through the control circuit and the scanning atres at that time, an NK sense line is formed. A coordinate reading device characterized by having two parallel conductor groups and a selection circuit, which speeds up 19-zigzag generation.