JPH1195903A - Coordinate indicator for coordinate reader, device and system for reading coordinate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make detectable the coordinate of an instructed position in an operating state without affecting the state of another coordinate indicator in the state of no operation and to make reportable the state of operation as well. SOLUTION: A touch switch 17 is provided to be turned on by lightly pressing an operating part 11 so that a coil 16 and a resonance capacitor are connected and when the touch switch 17 is turned on, a resonance circuit is constituted. Further, an operating switch 19 is provided to be turned on by pressing the operating part 11, the serial circuit of this switch and an operation capacitor is connected to the resonance circuit and when the operating switch is turned on, the resonance frequency of the resonance circuit is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate reading device for outputting a coordinate value and state information of a coordinate pointing device to an information processing device such as a computer, and more particularly to a coordinate pointing device used in the coordinate reading device. Things.

[0002]

2. Description of the Related Art A coordinate reading device is composed of a tablet as a coordinate reading plate and a coordinate indicator for designating a reading position. The coordinate reading device transmits read coordinate values and status information such as switches provided on the coordinate indicator to a computer or the like. Input device for outputting to an external device. A conventional coordinate reading device will be described with reference to FIG. Coordinate reading device 90
1 includes a tablet 920 and a coordinate indicator 930. The coordinate indicator 930 includes a resonance circuit 931 including a coil 932 and a first capacitor 933. Further, a series circuit of a switch 934 and a second capacitor 935 is connected to the resonance circuit 931 so that the resonance frequency changes according to ON / OFF of the switch 934.

On the other hand, on a tablet 920, a plurality of excitation lines DL1 to DL5 and sense lines SL1 to SL5 are arranged orthogonally, and these are scanning circuits 921 and 92.
2, one by one is sequentially selected. An AC excitation signal s901 is supplied to the excitation line from a coordinate calculation circuit 923 via a scanning circuit 921. The selected excitation line generates an AC magnetic field according to the excitation signal s901.

Since the excitation line and the sense line are orthogonal to each other, when the coordinate indicator 930 is not near the tablet 920, no induction signal is generated on the sense line. However, when the coordinate indicator 930 approaches, the excitation line is coupled to the sense line by the resonance circuit 931, and an induced signal s 902 corresponding to the position of the coordinate indicator 930 is generated on the sense line. Also, this induction signal s902 is
When the resonance frequency of the resonance circuit 931 of the coordinate indicator 930 changes, the phase difference from the excitation signal s901 changes.

[0005] Based on the guidance signal s902, the coordinate calculation circuit 923 calculates the coordinate value of the position indicated by the coordinate indicator. The status identification circuit 924 identifies the state of the switch 934 of the coordinate indicator 930 by detecting the phase difference. The coordinate values and the switch status detected in this manner are output to an externally connected computer or the like via the interface circuit 925.

The coordinate reading device is connected to a computer or the like, and executes a predetermined function according to the read coordinate values.
A system called a coordinate reading system can be configured. For example, software called "drawing software" or "paint software" is provided. By introducing these software, a system for drawing a picture can be configured. This system is referred to herein as a "drawing system."

The basic functions of a drawing system are to "draw" and "delete" a screen on a computer. These functions are functions realized by the computer software described above. However, in order to execute those functions selectively, it is necessary to give an external instruction. In a drawing system using a coordinate reading device as an input device, these instructions are performed based on the switch status of a switch provided on the coordinate indicator.

In a conventional coordinate reading device, a coordinate indicator called a stylus pen shown in FIG. 12 is used. A stylus pen 930 a has a pen switch and a side switch 937 that are turned on / off by pen pressure applied to a pen core 936.
And a switch referred to as a switch. The software assigns the status of these two switches to drawing and erasing. For example, it is used to draw when the coordinates are input while pressing the pen switch, and to erase when the coordinates are input while pressing the side switch.

In the case where a picture is drawn with a traditional stationery, for example, a paper and a pencil, an eraser is used to erase the picture on the paper. In order to configure the system in a manner similar to the operation environment using the stationery, a coordinate indicator has been proposed in which various measures are added. JP-A-8-335132
And JP-A-2-35512 disclose a configuration in which a resonance circuit and a switch for coordinate detection are also provided at the rear end of the stylus pen, and a switch frequency is changed by the switch to detect a switch status. ing.
In the stylus pen having such a configuration, if the stylus is inverted and instructed, the coordinate value can be calculated by coupling with the resonance circuit provided at the rear end, and an erasing instruction can be given by the switch status.

Japanese Unexamined Patent Publication (Kokai) No. 1-320521 discloses an eraser for an electronic blackboard, which is not normally constructed, but is configured such that when pressed against a writing surface, a switch is closed to form a resonance circuit. ing. This eraser indicates a position to be erased, and has the same meaning as a coordinate indicator. When the eraser is pressed against a point to be erased, a resonance circuit is formed, and a coordinate value can be calculated by coupling with the resonance circuit. Further, by detecting this coordinate value, it can be identified as an erasing instruction.

[0011]

However, in the method of executing the erase function by pressing the side switch of the stylus pen as described above, for example, the index finger is moved to the position of the side switch while holding the stylus pen. The user has to perform an operation of pressing the button, and there is a disadvantage that the operability is poor. In addition, there was a sense of incongruity compared with the operation using the eraser, and it did not match the method based on intuition. Further, there is a problem that the side switch is pressed by mistake even when it is not used, so that the existence of the side switch itself has a problem.

The stylus pens disclosed in JP-A-8-335132 and JP-A-2-35512 can execute an erase function by inverting the pen. Since this method has an eraser attached to the rear end of the pencil, it can be said that the operation is closer to the operation using the eraser than the above method. However, the stylus pen will have the function of two coordinate indicators,
There is a disadvantage that the configuration becomes complicated.

The eraser disclosed in Japanese Patent Laid-Open Publication No. Hei 1-320521 is the one that is closest to the operation of the eraser as compared with the above method. However, in this eraser, the resonance circuit is not configured in a normal state, and therefore, the pointing position cannot be detected when the eraser is not pressed against the erasing surface. In the case where the position of the figure written on the writing surface as an electronic blackboard is the erase position of electronic data as it is, this eraser is also practical, but in the case of the drawing system, it is displayed on the display. Electronic data must be specified and then deleted. Therefore, it is necessary to have a state for detecting coordinates and a state for further notifying the state of the operation.
The eraser disclosed in Japanese Patent Application Laid-Open No. 1-320521 cannot notify the operation state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional coordinate pointing device, and an object thereof is to provide an operation similar to the operation of an eraser of a stationery in a drawing system. , When not in operation,
An object of the present invention is to realize a coordinate indicator which can be placed on a tablet and does not affect the input of another coordinate indicator, and which is capable of not only detecting coordinates but also notifying the state of the operation when operating.

[0015]

Means for solving the above problems of the coordinate indicator according to the present invention include: a resonance circuit having a coil for electromagnetic coupling; a switch for opening and closing the resonance circuit; Resonance frequency varying means connected to the resonance circuit and changing the resonance frequency of the resonance circuit by operation.

Further, based on this configuration, the first configuration using a different configuration for the means for opening and closing the resonance circuit is characterized by an operation section for receiving an operation force, a coil for electromagnetic coupling, A switch that opens and closes with an operating force, the switch is not configured in a state in which no force is applied to the operation unit, and is connected to the resonant circuit in a state in which a force is applied; A resonance frequency varying means for changing a resonance frequency of the resonance circuit by a force applied to the portion.

Further, based on the above configuration, the second configuration using a different configuration for the means for opening and closing the resonance circuit is characterized by a holding portion that is held by hand and receives a holding force, and a holding portion that receives an operating force. An operation unit, a coil for electromagnetic coupling, and a switch that opens and closes by the holding force, is not configured in a state where no force is applied to the holding unit,
There is provided a resonance circuit configured in a state where a force is applied, and resonance frequency variable means connected to the resonance circuit and changing a resonance frequency of the resonance circuit by a force applied to the operation unit.

In the coordinate indicator according to the first configuration or the second configuration, each component may be built in a substantially rectangular parallelepiped shape, or incorporated in an eraser-like casing of a stationery that can be held by hand. Furthermore, based on the above configuration, a third configuration using a different configuration for the means for opening and closing the resonance circuit is provided.
The features of the configuration are: mounting means for mounting the coordinate indicator to an external structure, an operating unit for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing according to the mounting state. It is not configured in the state where it is not attached,
There is provided a resonance circuit configured in a mounted state, and resonance frequency variable means connected to the resonance circuit and changing a resonance frequency of the resonance circuit by a force applied to the operation unit.

In the third configuration, the mounting means is a mounting hole for mounting on a stylus pen, and the resonance circuit has a switch that opens and closes depending on a mounting state. It can be configured not to be configured in a state where the stylus pen is not inserted but to be configured in an inserted state. Further, as a configuration similar to the third configuration and a configuration in which the mounting means derived from this configuration is a mounting hole-shaped portion for mounting on a stylus pen, the resonance circuit is not configured in a mounted state. Alternatively, it may be configured without mounting.

In the coordinate pointing device having the above configuration, the resonance frequency varying means is a series circuit of a switch and a reactance circuit, and the reactance circuit is connected to the resonance circuit by a force applied to the operation unit. In this case, a capacitor can be used as the reactance circuit. In the coordinate indicator having the above-described configuration, the resonance frequency variable unit may be configured by a variable reactance circuit whose reactance changes by a force applied to the operation unit. In this case, the variable reactance circuit may include a variable capacitance or a variable capacitance. Inductance can be used.

Further, a feature of the configuration of the coordinate reading apparatus according to the present invention is that the coordinate reading device is provided with each of the above configurations, and the coordinate value of the position indicated by the coordinate pointing device and the operating force are detected and output to the outside. It is configured to do so. Furthermore, a feature of the configuration of the coordinate reading system according to the present invention is that the coordinate reading device includes the coordinate indicator according to each of the above configurations, detects the coordinate value of the position indicated by the coordinate indicator and the operation force, and outputs the coordinate value to the outside. An apparatus and an information processing apparatus that connects the coordinate reading device and performs a predetermined process by inputting the coordinate value and the operation force.

In this coordinate reading system, the information processing apparatus includes a display device, and performs the graphic processing by inputting the coordinate values and the operating force. When the resonance circuit is configured, the information processing apparatus includes a display device. A display cursor is displayed at a position corresponding to the coordinate value on the display device, and in a state where the operation force is detected, of the display information displayed on the display device, the display cursor is displayed at a position corresponding to the coordinate value. May be configured to delete the displayed information.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A coordinate indicator according to a first embodiment of the present invention will be described with reference to FIGS. In the following description, the coordinate indicator according to the present invention will be referred to as an “erase indicator” to distinguish it from the conventional coordinate indicator. This is because the coordinate indicator according to the present invention is used to indicate a position to be erased. FIG. 1 is a sectional view of an erase indicator according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a use state of the erase indicator,
FIG. 3 is a circuit diagram of the erasure indicator.

First, the internal structure will be described with reference to FIG. The rectangular parallelepiped case 20 includes a ferromagnetic core 15.
The coil 16 wound around is provided. A capacitor (not shown) is connected to the coil 16 to form a resonance circuit. The core 15 is provided with a through hole in the axial direction of the coil 16 and is used as a guide hole when the operation unit 11 moves in the axial direction.

The operation unit 11 is for instructing an erasure position. As shown in FIG. 1, in the present embodiment, a shape is obtained by cutting a part of a corner from a rectangular parallelepiped so as to form a rectangular parallelepiped when combined with the case 20. Since the case 20 and the operation unit 11 may be configured to resemble the eraser of a stationery, the tip of the operation unit 11 may be hemispherical in addition to such a shape. It is also possible to appropriately set the slip resistance by, for example, sticking materials having different frictions to the contact portion.

The operating section 11 is provided with a shaft 12 which is movably inserted into a through hole of the core 15. A spring receiver 13 is provided on the side of the shaft 12 opposite to the operation unit 11. A spring A14 is provided between the spring receiver 13 and the case 20,
In a normal state, the spring receiver 13 is pushed in the direction of the operation unit 11. The operating portion 11 is in a position away from the case 20 as shown in the normal state, but when a force is applied to the distal end, the spring A14 is compressed and moves toward the case 20. When the force is removed, the spring A14 returns to the original position.

A contact switch 17 is provided on a surface of the case 20 facing the operation unit 11. The contact switch 17
The spring B18 is inserted between the case 20 and the case 20 so as to be movable. This switch is turned on when pressed, and in a normal state, is brought into a state close to the operation unit 11 as shown in the figure. Then, a force is applied to the operation unit 11 so that the operation unit 11 is turned on when the operation unit 11 moves toward the case 20. Further, the movement amount of the operation unit 11 is set to be larger than the movement amount for turning on the contact switch 17, so that the movement amount beyond the turning on of the switch is absorbed by the movement of the contact switch 17 itself. Like that. The spring B18 is for returning the contact switch 17 to the original position when the force is removed and the operation unit 11 returns to the original position.

Further, the case 20 is provided with another switch, an operation switch 19, on the surface facing the operation section 11. The operation switch 19 is also a switch that is turned on by being pressed by the operation unit 11. However, the operation switch 11 is turned on, the contact switch 17 is turned on first, and when the operation unit 11 is further moved, the switch is turned on. Keep a positional relationship. In the figure, the protruding height from the case 20 is lower than that of the contact switch 17, so that such a relationship is established. Although a switch fixed to the case 20 is shown in the drawing, a switch such as a spring B18 may be provided to release unnecessary pressing force.

Among the components described above, the coil 16, the contact switch 17, and the operation switch 19 are connected as shown in the circuit diagram of FIG. The coil 16 is connected to the resonance capacitor 21 via the contact switch 17 so that a resonance circuit is formed when the contact switch 17 is closed. The contact switch 17 is a switch that is off when not pressed by the operation unit 11. The operation switch 19 is connected in series with the operation capacitor 22, and is further connected in parallel with the resonance circuit. Operation switch 19
Is a switch that is off when not pressed by the operation unit 11.

The circuit of the erasure indicator 1 is in a normal state,
That is, the resonance circuit is not formed when the operation unit 11 does not press any switches. When the operation unit 11 moves, first, the contact switch 17 is turned on, and the resonance capacitor 21 is connected to the coil 16 to form a resonance circuit having a resonance frequency determined by the constants of the two.
When the operation unit 11 is further moved, the operation switch 19 is turned on, and the operation capacitor 22 is connected in parallel to the resonance circuit, so that the resonance frequency changes.

The erasure indicator 1 configured as described above is used as shown in FIG. FIG. 2 is a perspective view showing a use state. The case 20 is held by hand, and a position to be erased is lightly touched by the operation unit 11 to give an instruction. This state is a state in which a force that turns on the contact switch 17 is applied. Then, when giving an instruction for erasing, the operating unit 11 is pressed with further force. In this state, a force is applied so that the operation switch 19 is turned on.

Next, the operation of the coordinate reading device when the erasure indicator 1 having the above-described configuration is used will be briefly described. FIG. 9 is a block diagram showing the configuration of the coordinate reading device. The erasure indicator 1 is an erasure indicator having the above configuration. The configuration of the tablet 54 is the same as the configuration of the conventional coordinate reading device. First, the erasure indicator 1 is set to the tablet 54.
In the case where it is not above or simply placed, no resonance signal is generated in this state, and no induction signal is generated on the sense line SL *. Therefore, the coordinate calculation circuit 57 does not calculate a coordinate value.

As described above, the erasure indicator 1 is connected to the tablet 5
When lightly touching on 4, a resonance circuit is formed, and this resonance circuit is coupled with the excitation line DL * and the sense line SL *, so that the induction signal s2 is induced on the sense line SL *. The coordinate calculation circuit 57 receives the guidance signal s2 and calculates the coordinate value of the designated position.
The status identification circuit 58 identifies that the operation switch 19 has not been operated based on the phase information of the guide signal s2.

Next, the erasure indicator 1 is pressed more strongly.
When the operation switch 19 is turned on, the resonance frequency of the resonance circuit changes, and the phase of the induction signal s2 changes. The status identification circuit 58 identifies that the operation switch 19 has been operated based on the change in the phase. The advantages of using the erasure indicator 1 according to the present invention are as follows. This erasure indicator 1 is intended to provide an environment resembling an eraser of a stationery in a coordinate reading device. A conventional stylus pen is equivalent to a writing instrument. Therefore, two coordinate indicators must be used simultaneously in the coordinate reading device. However, in a coordinate reading device of the type that is coupled by a resonance circuit, a plurality of coordinate indicators are placed on a tablet, and coordinates cannot be detected in a state in which a plurality of resonance circuits can be coupled. Therefore, the coordinate indicator corresponding to the eraser cannot be used if it is configured as a conventional coordinate indicator, that is, a constant resonance circuit is formed. This is because the eraser is always placed on the writing surface.

The erasure indicator 1 according to the above embodiment does not affect the function of the tablet at all if it is merely placed on the tablet. Therefore, input with the stylus pen is possible even in the placed state. When an erasing instruction is to be issued, the function as a coordinate indicator can be performed as described above. (Second Embodiment) Next, an erasure indicator according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view of an erase indicator according to a second embodiment of the present invention, and FIG. 5 is a perspective view showing a use state of the erase indicator.

In the first embodiment, the contact switch 17 is provided so that a resonance circuit is formed with a slight force applied to the operation unit 11. This contact switch 17
Is such that a resonance circuit is formed by natural operation. So if it is for this purpose,
The switch can be any type. In the second embodiment, a resonance circuit is configured when the erasure indicator is held by hand.

As shown in FIG. 4, a holding switch 23 is provided at a position where the case 20a is held by hand. Switch top 2
Reference numeral 4 denotes a part for operating the holding switch 23.
It is configured so as to have an integrated design. This holding switch 23 corresponds to the contact switch 17 of the first embodiment. The use state of the erase indicator 1a is as shown in FIG. The switch top 24 is provided at an appropriate position,
The holding switch 23 is turned on when held by hand. The circuit is the same as the circuit diagram shown in FIG. 3 except that the names of the switches are different from those of the first embodiment.

The erasure indicator 1a does not constitute a resonance circuit only by being placed on the tablet, and no coordinates are detected. When held by hand, the holding switch 23 is turned on to form a resonance circuit, and the coordinate value is calculated. If the operation unit 11 is further pressed against the tablet, it is identified that the resonance frequency has changed and the operation switch has been turned on.
Thus, it has the same function as the above embodiment. (Third Embodiment) Next, an erasure indicator according to a third embodiment of the present invention will be described with reference to FIGS. The erasure indicator according to this embodiment is configured to be attached to a rear end of a stylus pen or the like. FIG. 6 is a sectional view of an erasing indicator according to a third embodiment of the present invention, and FIG. 7 is a perspective view showing a mounted state of the erasing indicator.

The internal structure will be described with reference to FIG.
The case 20b has a cylindrical shape, and is provided with a core 15 and a coil 16 similar to those of the above embodiment. The operating portion 11b also has a shape extending to the cylinder of the case 20b, and is provided movably in the axial direction of the cylinder by the shaft 12b, the spring receiver 13, and the spring A14. These configurations are the same as those in the above embodiment. Only the operation switch 19b is provided on the surface of the case 20b facing the operation unit 11b. This operation switch 19
b is the same as in the above embodiment, and is turned on when the operation unit 11b moves.

A mounting hole 26 is provided on the surface of the case 20b opposite to the operation portion 11b. The mounting hole 26 is for inserting a rear end of the stylus pen or the like.
A mounting detection switch 25 is provided on the inner wall of the mounting hole 26.
This switch corresponds to the contact switch or the holding switch in the above embodiment, and is turned on when nothing is inserted into the mounting hole 26, and turned off when a stylus pen or the like is inserted.

The erasure indicator 1b configured as described above is
As shown in FIG. 7, it can be attached to the rear end of the stylus pen 930a or the like. In this state, since the resonance circuit is not formed, even if the stylus pen is placed on the tablet, the erase indicator 1b is not detected by the tablet. When the erasure indicator 1b is removed from the stylus pen 930a, a resonance circuit is formed. Therefore, if the erasure indicator 1b is pointed alone on the tablet, the coordinate value at that position is detected.
When the operation unit 11b is pressed, the operation switch 19 is pressed.
b turns on and its status is detected.

The on / off state of the attachment detection switch may be reversed to constitute the erasure indicator. That is,
That is, the resonance circuit is configured in the mounted state, and is not configured in the unmounted state. In this case, since the erasure indicator alone does not function, placing it on the tablet does not affect reading by the stylus pen. (Fourth Embodiment: Configuration of Coordinate Reading Apparatus and Coordinate Reading System) Coordinate reading is performed by using the above-described erasure indicator, and by connecting the coordinate reading apparatus and an information processing apparatus such as a computer. The system can be configured.

Since various types of coordinate reading devices having a resonance circuit in the coordinate pointing device have been proposed, they will be realized by any configuration, and the description of the technology relating to the coordinate reading device body will be omitted. As already explained, FIG.
1 is a block diagram of an embodiment of a coordinate reading device using an erasure indicator according to the present invention. The coordinate reading device thus configured is connected to an information processing device such as a computer, and a coordinate value, a switch status of a coordinate indicator, and the like are input from the coordinate reading device, and coordinates for performing a process determined based on the input information are input. A reading system can be configured. FIG. 8 is a configuration diagram of a coordinate reading system according to the present invention.
The coordinate reading device 50 includes the stylus pen 930a and the first
And the tablet 54 according to the embodiment. The coordinate reader 50 is provided with a standard interface circuit such as a serial interface, and is connected to the computer 60. The computer 60 is installed with application software, for example, drawing software, and executes its functions.

The following operation is possible in the coordinate reading system according to the present invention. FIG. 10 is an explanatory diagram showing display and erasing operations in a drawing system in which drawing software is introduced. As shown in FIG. 10A, a display graphic 63 is displayed on the display screen of the display device 61. The display graphic 63 displays a figure according to the coordinate values input by the stylus pen.
As described above, when inputting with the stylus pen, leaving the erasure indicator 1 on the tablet 54 does not affect the input.

When erasing the display graphic 63, the erasure indicator 1 is first pressed lightly on the tablet 54 to give an instruction. In this state, the contact switch is turned on to form a resonance circuit, and the coordinate value of the indicated position is detected. The computer 60 inputs the coordinate values and displays the display cursor 62 at the corresponding position on the display screen. In this state, the operator can specify the position of the display graphic to be deleted.

Once the position of the display graphic to be erased is determined,
The operator further pushes the erase indicator 1 at that position. In this state, the operation switch is turned on, the resonance frequency of the resonance circuit changes, and the operation is detected by the tablet 54. The computer 60 inputs the operated status, and erases the display figure at the position corresponding to the coordinate value input at the same time. (FIG. 10 (b)) As described above, if the erasure indicator 1 according to the present invention is used, the position to be erased can be displayed and confirmed on the display device.
Further, the status of the erasure can be notified to the position thus confirmed. Such an operation cannot be realized by the conventional eraser disclosed in, for example, JP-A-1-320521.

[0047]

The coordinate indicator, the coordinate reading device, and the coordinate reading system according to the present invention have been described.
Each of these configurations can be implemented with various variations. Hereinafter, some embodiments will be described. First, in the erasure indicator according to the above embodiment, the means for notifying the operation state is a series circuit of a switch and a capacitor, and the resonance frequency of the resonance circuit is changed by turning on / off the switch. Is detected to identify the state of the operation. For example, in the first embodiment, the operation switch 1
9 and the operating capacitor 22 correspond to this.

As a means for notifying the operation state in the field of the coordinate reading apparatus, a technique of continuously changing the inductance of the coil by the pen pressure in order to detect the pen pressure of the stylus pen is known. The present invention can be applied to a coordinate indicator employing this technique. FIG.
FIG. 1 is a sectional view of an erase indicator according to the fifth embodiment of the present invention, and FIG. 12 is a circuit diagram of the erase indicator. As shown in FIG. 11, a moving core 27 made of a ferromagnetic material is newly provided on the shaft 12c of the operation unit 11c. Operation unit 11
As c moves, the distance between the moving core 27 and the core 15 changes, and as a result, the inductance of the coil 16c changes. Other configurations are the same as those of the first embodiment. The circuit diagram is as shown in FIG. As in the first embodiment, when the operation unit 11c is lightly pressed, the contact switch 17 closes to form a resonance circuit. The coil 16c is a variable inductance that changes with the movement of the operation unit 11c.

In this embodiment, the resonance frequency of the resonance circuit changes continuously as the operation section 11c moves. In the tablet, the state of the continuous operation applied to the operation unit 11c can be detected by detecting the continuous change of the resonance frequency. Further, a similar configuration may be adopted using a variable capacitor instead of the variable inductance. Further, the coordinate reading device or the coordinate reading system may be configured using the erasure indicator configured to continuously change the resonance frequency as described above.

[0050]

As described above, according to the present invention, the coordinate indicator used in the coordinate reading device includes the switch for opening and closing the resonance circuit, and the resonance frequency variable means for changing the resonance frequency of the resonance circuit by operation. Was. According to the coordinate indicator configured as described above, even if the coordinate indicator is placed on the tablet of the coordinate reading device, a resonance circuit is not usually formed, so that the input operation by another coordinate indicator is affected. Do not give. On the other hand, when the coordinate indicator is operated, the switch is closed to form a resonance circuit, and the resonance frequency changes according to the operation. Therefore, the tablet can detect the state of the operation in addition to detecting the coordinate value of the position designated by the coordinate indicator.

Therefore, if the coordinate reading device using this coordinate indicator is used, for example, to realize the erasing function of the drawing system, the position to be erased can be displayed on the display and confirmed by the coordinate value. After the position is determined, an erasing instruction can be notified. In this way, an operation similar to the operation of the eraser of the stationery can be performed in the drawing system, and the operability of such a system can be improved in addition to the advantage of the electronic drawing system.

[Brief description of the drawings]

FIG. 1 is a sectional view of an erase indicator according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a use state of the erasure indicator according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of the erase indicator according to the first embodiment of the present invention.

FIG. 4 is a sectional view of an erase indicator according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a use state of an erasure indicator according to a second embodiment of the present invention.

FIG. 6 is a sectional view of an erase indicator according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing a mounted state of an erasure indicator according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a coordinate reading device and a coordinate reading system according to the present invention.

FIG. 9 is a block diagram of a coordinate reading device according to the present invention.

FIG. 10 is an explanatory diagram showing display and erasing operations in a drawing system as an example of a coordinate reading system according to the present invention.

FIG. 11 is a sectional view of an erase indicator according to a fifth embodiment of the present invention.

FIG. 12 is a circuit diagram of an erase indicator according to a fifth embodiment of the present invention.

FIG. 13 is an external perspective view of a conventional stylus pen.

FIG. 14 is a block diagram of a conventional coordinate reading device.

[Explanation of symbols]

 1, 1a, 1b, 1c Erasing indicator 11, 11b, 11c Operating part 12, 12b, 12c Shaft 13 Spring receiver 14, 14c Spring A 15 Core 16, 16c Coil 17 Contact switch 18 Spring B 19, 19b Operation switch 20, 20a, 20b, 20c Case 21 Resonant Capacitor 22 Operation Capacitor 23 Holding Switch 24 Switch Top 25 Mounting Detection Switch 26 Mounting Hole 27 Moving Core 50 Coordinate Reading Device 51 Stylus Pen 52 Pen Core 53 Side Switch 54 Tablet SL1 to SL5 Sense Line DL1 DL5 excitation line 55, 56 operation circuit 57 coordinate calculation circuit 58 status identification circuit 59 interface circuit 60 computer 61 display device 62 display cursor 63 display figure 70 coordinate reading system Tem

Claims (16)

[Claims] 1. A resonance circuit having a coil for electromagnetic coupling, a switch for opening and closing the resonance circuit, and a resonance frequency variable means connected to the resonance circuit and changing a resonance frequency of the resonance circuit by operation. A coordinate indicator for a coordinate reading device, wherein the coordinate indicator is provided. 2. An operation unit for receiving an operation force, a coil for electromagnetic coupling, and a switch which is opened and closed by the operation force, wherein the switch is configured in a state where no force is applied to the operation unit. A resonance circuit configured in a state where a force is applied thereto, and resonance frequency variable means connected to the resonance circuit and changing a resonance frequency of the resonance circuit by a force applied to the operation unit. Coordinate reading device of the coordinate reading device. A holding portion for receiving a holding force held by hand, an operating portion for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing by the holding force; A resonance circuit that is not configured in a state where a force is not applied to the portion, and is configured in a state where a force is applied; a resonance frequency that is connected to the resonance circuit and that changes a resonance frequency of the resonance circuit by a force applied to the operation unit A coordinate indicator of a coordinate reading device, comprising a variable means. 4. A coordinate pointing device for a coordinate reading apparatus according to claim 2, wherein said coordinate pointing device is built in a substantially rectangular parallelepiped casing. 5. A mounting means for mounting the coordinate indicator on an external structure, an operating unit for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing according to the mounting state. And a resonance circuit that is not configured in a non-mounted state and is configured in a mounted state, and a resonance frequency variable unit that is connected to the resonance circuit and that changes a resonance frequency of the resonance circuit by a force applied to the operation unit. A coordinate indicator for a coordinate reading device, wherein the coordinate indicator is provided. 6. A mounting means for mounting the coordinate indicator on an external structure, an operation unit for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing according to the mounting state. However, it is not configured in the mounted state,
A coordinate reading device comprising: a resonance circuit configured in a non-attached state; and a resonance frequency variable unit connected to the resonance circuit and configured to change a resonance frequency of the resonance circuit by a force applied to the operation unit. Coordinate indicator. 7. A mounting hole for mounting the coordinate indicator on a stylus pen, an operating unit for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing depending on the mounting state. A resonance circuit that is not configured in a state in which the stylus pen is not inserted into the mounting hole, but is configured in an inserted state; and a resonance circuit that is connected to the resonance circuit and that is applied to the operation unit by a force applied to the operation unit. A coordinate pointing device for a coordinate reading device, comprising: resonance frequency changing means for changing a resonance frequency. 8. A mounting hole for mounting the coordinate indicator on a stylus pen, an operating unit for receiving an operating force, a coil for electromagnetic coupling, and a switch for opening and closing according to the mounting state. A resonance circuit that is not configured in a state where the stylus pen is inserted into the mounting hole, and is configured in a state where the stylus pen is not inserted. A coordinate pointing device for a coordinate reading device, comprising: resonance frequency changing means for changing a resonance frequency. 9. The resonance frequency varying means is a series circuit of a switch and a reactance circuit, wherein the reactance circuit is connected to the resonance circuit by a force applied to the operation unit. 9. The coordinate indicator of the coordinate reading device according to claim 1. 10. The coordinate indicator according to claim 9, wherein the reactance circuit is a capacitor. 11. The coordinate pointing device according to claim 1, wherein the resonance frequency varying means is a variable reactance circuit whose reactance changes according to a force applied to the operation unit. 12. The coordinate indicator according to claim 11, wherein the variable reactance circuit is a variable capacitance. 13. The coordinate indicator according to claim 11, wherein the variable reactance circuit is a variable inductance. 14. A coordinate comprising the coordinate indicator according to claim 1, wherein a coordinate value of a position indicated by said coordinate indicator and said operating force are detected and output to the outside. Reader. 15. A coordinate reading device comprising: the coordinate indicator according to claim 1; and a coordinate reading device that detects a coordinate value of a position indicated by the coordinate indicator and the operating force and outputs the detected operation force to the outside. A coordinate reading system comprising: a coordinate reading device connected thereto; and an information processing device that performs a predetermined process by inputting the coordinate value and the operation force. 16. A coordinate reading device comprising: the coordinate indicator according to claim 1; and a coordinate reading device that detects a coordinate value of a position indicated by the coordinate indicator and the operating force and outputs the operation force to the outside. A coordinate reading device is connected to the information processing device. The information processing device includes a display device, and performs the graphic processing by inputting the coordinate values and the operation force. The information processing device includes the resonance circuit. In the state, a display cursor is displayed at a position corresponding to the coordinate value on the display device, and in the state where the operation force is detected, among the display information displayed on the display device, according to the coordinate value. A coordinate reading system for erasing display information displayed at a position.