JPS59119490A - Coordinate detecting part of coordinate input device - Google Patents

Abstract

PURPOSE:To reduce the cost and at the same time to prevent the deterioration of a coordinate position accuracy by forming an electric wire having a constant section area and minute width in a rectangular wave form within an effective coordinate reading region and using the resistance value generated between both ends of the electric wire for a coordinate detecting part. CONSTITUTION:A wire 10 having a constant section area and minute width is formed on an electrically insulated sheet 1 as shown in the figure. The both ends 11 of the wire 10 are used as electrodes. Thus a coordinate detecting part is formed, and therefore the resistance value is generated between terminals 12 and 13. Then numbers 1-m are given to the wire 10 in the direction X, and a potential is applied between the terminals 12 and 13. Thus the potential varies in a range of O-V1 on a thin wire 1 and in a range of V1-V2 on a fine wire 2 respectively. Then the output potential VP of a point P is converted into a digital form by an A/D converter of resolution (m). Therefore the digital quantity shows the number (n) of the thin wire at the point P and also shows the X coordinates. In such a way, the coordinate detecting part is formed in a simple process. Furthermore the deterioration can be avoided for the accuracy of the coordinate position.

Description

[Detailed Description of the Invention] [Field of Application of the Invention j The present invention relates to a coordinate detection unit of a coordinate input device, and particularly to a coordinate detection unit for a coordinate input device. The present invention relates to a coordinate detection section of a coordinate input device suitable for improving accuracy and reducing cost by simplifying the process of creating the coordinate detection section.

[Prior art]

An example of a coordinate detection section of a conventional coordinate input device is shown in FIG. It has a structure in which a conductive wire group 2 is formed on an electrically insulating sheet 1, and a resistance layer 3 is formed at one or both ends of the wire group 20 in the groove. Electrodes 4 are arranged at both ends of the resistance layer.

FIG. 2 shows a configuration diagram of the current detection type coordinate input device. Conductive wire group 6 for coordinate position detection on both sides of pressure-sensitive conductive rubber sheet 50
Suppose that the conductive wire groups 6a, 6b are opposed to each other so that a*6b can be varied, and a point P connecting the electrodes 8a, 8b at both ends of the resistance layer 7a+7b to the current source 9 and the reference potential is pressurized. When Xj and Yi of , come into contact at point P, the current flowing n is determined by the resistance value between each terminal and Xi and Yi. These current values are 1. as shown in the figure.
~14, and the coordinates ML of point P (X p +Yp
) is Xp=x°i5/(1B+in)+Yp-y・'z/(
11+12)-(1). X and y are coefficients for converting to real coordinates.

FIG. 3 shows a configuration diagram of the potential detection type coordinate input device. The configuration is the same as in FIG. In this example, the coordinate values are determined over time. When the X coordinate of the pressurizing point P is obtained, a potential EFf is applied to the resistance layer 7b as shown in the figure. At this time, the potential ■ appearing on the conductive wire X1 that is in contact at the pressurizing point P
. ut is passed through the conductive wire Yt'f and taken out from the terminal pair 8a.

The X coordinate Xp at this time is Xp=x″Ra/(R5+RJ)
<2). X is a coefficient for converting to real coordinates. Similarly, the resistance layer 7aK potential E'ff: given.

Using the resistance layer 7b as an output terminal, Yp = 7''R+/(R+ + R2)
(3) is expressed as n. y is a coefficient for converting to real coordinates.

However, in the coordinate detecting section having the configuration shown in FIG. However, multiple processes such as providing terminals are required. Furthermore, due to the non-linearity of the resistance layer 3, is there a decrease in the N degree of the reading coordinate? ! There were drawbacks such as -1 delay.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks in the coordinate detection section of the conventional coordinate input device, to form a single process system, and to provide a configuration in which nonlinearity does not occur in the coordinate detection section, thereby reducing costs and reading coordinates. It is an object of the present invention to provide a coordinate detection section of a coordinate input device that does not cause a decrease in accuracy.

[Summary of the Invention J The present invention solves the inconvenience caused by the conventional coordinate detection unit consisting of a signal detection unit and a coordinate reading unit by a single process that utilizes the resistance value of fine conductive wires. We focused on the fact that the coordinate detection unit can be realized with a simple configuration.

[Invention σ) Examples]

A structural diagram of an embodiment of the present invention is shown in FIG. 41 below. On the electrical insulating sheet 1, the electrical cross section is fine +1j10Y
It is formed as shown in the figure, and its both ends 11 are used as electrodes.

Figure 5 shows the overall diagram. In order to realize a coordinate detection section with such a configuration, it is good to have a resistance value between terminals 12 and 13. The electric cross section fine wire 10 has a resistance value between the terminals 12 and 15, and the resistance does not depend on the material of the short electric cross section fine wire 10. For example, assume that the electrical cross-sectional area fine wire 10 is made of copper, and the cross section of this fine wire is 35 μm in length.

The width is 60 μm, the length of part a in the figure is 300 mE, the effective coordinate reading is, and the electrical cross-sectional area fine line 1o is 1024 in the taken area.
If this is the case, the total resistance value between the terminals 12 and 13 will be about 2.6Ω. Here, numbers 1 to m are assigned to the electric cross section fine M line 1o in the X direction as shown in the figure. When a potential E7 is applied between the terminals 12 and 13 as shown in the diagram, the potential on the fine wire 1 changes by 0V-V+VJT,
The potential v on the fine wire 2 changes from v to v2v. The overall relationship is as shown in FIG. Therefore, f'L, which converts the output potential VP at point P in FIG.
The minute line number nQ of the point is expressed, and this line also expresses the X coordinate at the same time.

By creating such a structure, it can be created by a single process of forming the short-area fine lines 10 on the electrical insulating sheet 1, and the use of the short-area fine lines 10 is effective coordinate reading area. This has the effect that a linear output can be obtained within n, and a decrease in coordinate position accuracy can be prevented.

FIG. 7 shows a structural diagram of a current detection type coordinate input device using the coordinate detection section of the present invention. Coordinate detection parts k according to the present invention are provided on both sides of the pressure-sensitive conductive rubber sheet 50.

The effective coordinate reading area coincides with the electric cross section fine a10.
It has a structure in which the long horizontal lines are opposed to each other so that they intersect at right angles.

As shown in the figure, for example, the current source 9 is connected to the terminal 14.15 of the Y-direction coordinate detection section 10a, and the X1 coordinate detection section 1
Connect terminals 16 and 17 of 0b to the reference potential. At this time, the coordinates (Xp*'ip) of the pressurizing point P are Xp=x°ix/(iS+ia), YP=3''12/(
11+12). x and y are coefficients for converting to real coordinates. Said current 1. ~IA is determined by the resistance value at each of the terminals 14 to 171 from point P, and this resistance value is determined by using the electrical cross-sectional area of the fine line.

There is an effect that a linear output can be obtained within the effective coordinate reading area.

FIG. 8 shows a structural diagram of a potential detection type coordinate input device using the coordinate detection section of the present invention. It has a structure similar to that shown in FIG. 7, with Xs on both sides of the pressure-sensitive conductive rubber sheet 50.

A Y-direction coordinate detection section is arranged. In this example, X.

The Y coordinate value will be determined over time. Now, if we want to find the X coordinate 7, we will apply a potential E between terminals 17 and 16 and
Potential V at point P on the direction coordinate detection section 10b. Pass ut through the Y-direction coordinate detection unit 10a to obtain terminals 14 and 15. At this time, Vout is expressed as Vout=ER+/(R+10Rz). Resistance R+lR2 each represents a resistance value from point P to terminal 16.17. Therefore, the X coordinate XP can be expressed as Xp-x-R+/(fh+R2). X is a coefficient for converting to real coordinates. Using the Nishi-like method, the Y coordinate is also the resistance 4I@'x Rs from point P to terminal 14°15, and if R4 is set, Yp='! ”
It is obtained by Rs/(Rs + Ra). y is a coefficient for converting to real coordinates.

With this structure, since a resistor with a fine line of 1° in area is used, a linear output can be obtained within the effective coordinate reading area, and a decrease in coordinate position accuracy can be prevented. There is. In the examples shown in Figures 7 and 8, the pressure-sensitive rubber sheet 5 is used as the pressure-sensitive material 4, but even a spacer that conducts vertically when pressurized and is insulated when not pressurized can have exactly the same effect. There is.

〔Effect of the invention〕

According to the present invention, the coordinate detecting section of the coordinate input device can be created by a single process in which the electric cross section fine line 10 is formed on the electrically insulating sheet material 1, and the electric cross section fine line 10 itself can be created. Since the resistance value of the is used to detect the coordinate position, the cost is reduced by simplifying the process of creating the coordinate detection section, and the electric cross section is fine! This has the effect of preventing a decrease in coordinate position accuracy due to the linearity of the resistance value in the +a1111i+8 orientation.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional coordinate detection section, Fig. 2 is a structural diagram of a conventional current detection type coordinate input device, Fig. 3 is a structural diagram of a conventional potential detection type sitting image input device, and Fig. 4 is a diagram of the present invention. A configuration diagram of the coordinate detection section, FIG. 5 is an overall diagram of the coordinate detection section according to the present invention, FIG. 6 is a diagram showing the relationship between minute line numbers and output potential, and FIG. 7 is a current detection type coordinate system using the coordinate detection section according to the present invention. FIG. 8 is a structural diagram of a current detection type coordinate input device using a coordinate detection section according to the present invention. Explanation of symbols 1... Electrical insulating sheet, 2... Conductive wire group, 6...
Resistance layer, 4...electrode, 4...pressure-sensitive conductive rubber sheet,
6a゛...Group of conductive wires for X-direction coordinate detection, 6b...X
Conductive wire group for direction coordinate detection, 7a, 7b...resistance layer-8
a, 8b...Terminal pair, 9...Current source, 10...Electric cross section fine wire, 11...Terminal pair -12, 13, 14,
15, 16, 17...terminals. 10a...Fine line for X direction coordinate detection, 10b...X
Fine line for detecting directional coordinates. 1 figure O 2 figure 3 figure 4 figure 5 Aχ literary system [B8 milk number off figure

Claims (1)

[Claims] 1. From one corner of the rectangular effective coordinate reading area on the electrically insulating sheet-like material, a series of electric wires having a fine width with an electric cross section are formed in the effective coordinate reading area in the form of a rectangular wave, and the electrical cross section is A coordinate detection section of a coordinate input device, characterized in that a resistance value generated between both ends of a fine line is used as the coordinate detection section.