JPH0546103Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a position indicator that indicates the position to be detected by a position detection device, etc., and it is similar to writing on a piece of paper with a fountain pen. This relates to a position indicator that gives a similar feeling.

[Conventional technology]

When a pen-shaped or other shaped position indicator is used to instruct a flat position indicator, the indicated position coordinates are detected and displayed on a display or other display means, stored, or There are position detection devices that print. The position indicator used in this position detection device has a pen shape such as a so-called stylus pen.
There are also some that have the functionality of a ballpoint pen so that you can write on them.

[Problem that the invention aims to solve]

Among the above-mentioned position indicators, the ballpoint pen type allows you to draw characters and figures on the piece of paper by placing a piece of paper on the position indicator and writing on it, and the position detection device detects the indicated coordinates. Display, storage, etc. are performed.

However, ballpoint pen type position indicators are sometimes not preferred because they have a hard feel when writing. That is, it is preferable that the position indicator has various types depending on the situation at the time of inputting the position.

Therefore, the object of this invention is to provide a fountain pen-shaped position indicator in order to increase the number of types of position indicators.

[Means for solving problems]

In order to achieve the above object, the position indicator according to this invention has a built-in resonant circuit consisting of a coil and a capacitor to tune to the radio waves emitted from the tablet and eliminate the electromagnetic field caused by the tuning. A position indicator for transmitting information to the tablet to indicate a position on the tablet, the coil of the resonant circuit and a metal piece shaped like a pen tip being connected to the position indicator so that the pen tip covers the coil. Provided at the tip,
The pen tip is configured to be able to change and restore freely in a direction perpendicular to the axial direction by applying and releasing pressure, and by changing the stray capacitance between the pen tip and the coil in accordance with the pressure. The coil is characterized in that the tuning frequency of the resonant circuit is changed to notify the tablet of the position of the position indicator and the change in the pen tip;
The pen tip is wound around a ferrite core, and the pen tip has a crack formed in the center so that when a dip pen or cartridge ink is used, the ink can be guided to the tip of the pen tip. It is a feature.

Furthermore, by incorporating a resonant circuit consisting of a coil and a capacitor, it tunes to the radio waves emitted from the tablet, transmits the electromagnetic field caused by the tuning to the tablet, and creates a position on the tablet that indicates the position on the tablet. The indicator is composed of two metal pieces with a dielectric interposed between them, one of the metal pieces having a pen tip shape is provided at the tip of the position indicator, and the metal piece having the pen tip shape applies pressure. A variable capacitance capacitor is configured such that it can be peeled off and repaired from the dielectric by applying and removing the pressure, and a resonant circuit is configured by connecting the capacitor to a coil. It is also characterized in that the position of the position indicator and the change in the pen tip due to the pressure are notified by an electromagnetic field transmitted to the tablet by changing the tuning frequency of the coil. is wound around a ferrite core, and the metal piece with the nib shape has a crack in the center so that the ink can be guided to the tip of the nib when using a dip pen or cartridge ink. It is characterized by the formation of

[Effect]

Since a pen tip is attached to the tip of the position indicator, when drawing characters or figures on the position indicator of the position detection device, it feels as if you are writing with a fountain pen.

In addition, if the ink flows out from the pen tip, by placing a piece of paper on the position indicator and operating the position indicator on it, characters or figures can be drawn on the piece of paper, and the position detection device can also The position coordinates indicated by the position indicator can be displayed and stored.

[Example] Hereinafter, the position indicator according to this invention will be specifically explained based on the example shown in FIGS. 1 to 10.

First, as a position detection device suitable for using this position indicator, there is a device described in Japanese Patent Application Laid-open No. 115220/1983, and an outline of this position detection device is explained according to Figs. 8 to 10. explain.

As shown in FIG. 8, this position detection device is composed of a control device 4 connected to an input/output panel 2 constituting a position indicator, a power supply device 6, and an input pen 8 as a position indicator. A position arbitrarily designated by the input pen 8 on the input/output panel 2 is detected.

The input/output panel 2 includes position detectors 10x and 1 in the X direction and the Y direction, as shown in FIGS. 8 and 9.
A flat display panel, for example, a liquid crystal display panel 12 as a display for displaying coordinates, is placed on the position detection unit 10 made of 0y, and these are housed in a case 14 made of non-metal.

The control device 4 includes a position detection control circuit that controls the position detection section 10, a display control circuit that controls the liquid crystal display panel 12, and an electronic computer that collectively controls these control circuits.

In addition, the power supply device 6 may include a well-known rectifier or transformer,
It consists of a DC-DC converter, etc., and supplies power to each circuit within the control device 4.

FIG. 10 shows the configuration of the position detection control circuit in the X direction and the position detection section 10x.
48 loop coils C ₁ , C ₂ , . . . C ₄₈ are constructed by partially overlapping adjacent loop coils C. One ends of these loop coils C ₁ to C ₄₈ are respectively connected to one terminal group 16a of the selection circuit 16, and the other ends are respectively connected to another terminal group 16b. This selection circuit 16 is connected to the loop coil.
One of the loop coils _{C1 to C48} is sequentially selected, and this selection is made based on information from the processing device 18, and the selection contact 16c corresponding to the terminal group 16a and the selection contact 16c corresponding to the terminal group 16b are selected. selection contact 16d
This is done by switching in conjunction with the

The selection contacts 16c and 16d are a selection contact 20a and a selection contact 20b of the connection switching circuit 20, respectively.
It is connected to the. This connection switching circuit 20 connects one loop coil C ₁ selected by the selection circuit 16 alternately to a transmitting circuit 22 and a receiving circuit 24, and a terminal 20c connected to a selection contact 20a. , 20d and the terminal 20e, 20f connected to the selection contact 20b.
Terminals c and 20e are connected to the output terminal of the transmitting circuit 22, and terminals 20d and 20f are connected to the input terminal of the receiving circuit 24. Note that the selection contact 20a and the selection contact 20b of the connection switching circuit 20 operate in conjunction with each other to switch between transmission and reception.

A Y-direction position detection control circuit and a position detection section 10y configured in the same manner as described above are provided so that the position detection section 10y is substantially perpendicular to the position detection section 10x to detect the XY coordinates of the indicated position. A position detection device is configured.

One embodiment of the input pen 8 according to this invention, which is used in the above-mentioned position detection device, will be described with reference to FIGS. 1 to 3. The input pen 8 has a shape almost similar to a fountain pen, and consists of a pen shaft portion 80 and a cap 82 made of a non-metallic material such as synthetic resin. A pen nib part 84 is fixed to the tip of the pen shaft part 80 as a pen nib made of metal or non-metal, having a shape similar to the nib of a fountain pen and having appropriate elasticity. As shown in FIG. 1, a coil 86 serving as a position indicating means wound around a ferrite core is fixed to the inside of the pen nib portion 84.

Further, the pen shaft portion 80 includes a built-in capacitor 88 and other components that cooperate with the coil 86 to form a tuning circuit. This tuning circuit is constituted by a well-known parallel resonant circuit in which a capacitor 88 and a variable capacitor 90 are connected in parallel to both ends of the coil 86, as shown in FIG. The resonant frequency of this resonant circuit is selected to be a value that is in tune with the frequency of the radio waves transmitted by each loop coil _C1 of the position detecting section 10.

Further, a capacitor 94 is connected to both ends of the coil 86 via a switch 92, and when the switch 92 is turned on, it acts to delay the phase of the radio wave in the above-mentioned parallel resonant circuit by a predetermined angle. This switch 92 is provided at a location where one of the fingers is positioned when the input pen 8 is held for inputting, for example, and is used when drawing characters or figures on the input/output panel 2. It is turned on by pressing it. Furthermore, in the devices shown in FIGS. 4 to 7, a switch 92 is turned on when the pen tip 84 comes into contact with the input/output panel 2.

In the embodiment shown in FIGS. 4 and 5, a stray capacitance 98 is interposed between the metal pen tip 84 and the coil 86 wound around a ferrite core 96. , both ends of a capacitor 88 and a variable capacitor 90, which are connected in parallel, are connected.

Furthermore, in the embodiment shown in FIGS. 6 and 7,
A metal plate 100 is disposed at a metal pen tip 84 with an appropriate gap, and a dielectric 102 is interposed in the gap between the pen tip 84 and the metal plate 100 to form a capacitor. Further, when the pen tip portion 84 is bent, the pen tip portion 84 and the dielectric material 102 are appropriately separated. One end of the coil 86 wound around the ferrite core 96 is connected to the pen tip 84, and the other end is connected to the metal plate 100.

The operation of the input pen 8 according to the invention constructed as above will be explained below. Note that the details of the detection procedure of the above-mentioned position detection device are publicly known (Japanese Patent Application Laid-Open No. 115220/1983), so a summary of the detection procedure will be explained.

When the loop coil C ₁ is connected to the transmission circuit 22, radio waves based on the input signal P sent out from the transmission circuit 22 are generated from the loop coil C ₁ . At this time, if the input pen 8 is present near the loop coil _C1 , the radio wave excites the coil 86 of the input pen 8, and an induced voltage synchronized with the input signal P is generated in the tuned circuit. After that, when the connection of the loop coil C ₁ is switched to the receiving circuit 24,
The radio waves from the loop coil _C1 disappear immediately, but since there is no circuit change in the tuning circuit of the input pen 8, the induced voltage gradually attenuates. The coil 86 generates a radio wave by the current flowing through the tuned circuit based on this induced voltage, and this radio wave excites the loop coil C ₁ contrary to the above, and the induced voltage is generated in the loop coil C ₁ . will occur. At this time, the loop coil
Since C ₁ is connected to the receiving circuit 24, this induced voltage is input as the receiving signal Q from the receiving circuit 24 to the processing device 18.

In this way, the connection of the loop coil C ₁ is sequentially switched while alternately switching the connection of the loop coil C ₁ to the transmitting circuit 22 and the receiving circuit 24. When the input pen 8 is located above the loop coil C ₁ ,
The induced voltage V ₁ generated in this loop coil C ₁ ,
Comparing the induced voltages V _{i- 1 and V i+1 generated in the adjacent loop coil C i-1} and loop coil C _{i+1 ,} V _i is the largest, and V _i-1 , V _i-2 ,... ..., V _io and gradually become smaller as V _i+1 , V _i+2 , ..., V _i+o . A processing device 18 processes the values of these induced voltages.
Since the loop coil C ₁ pointed to by the input pen 8 can be detected by comparing with
This indicated position can be detected as XY coordinates.

Furthermore, in the input pen 8 shown in FIG. 1, when the switch 92 is turned on, the phase of the current at the resonant frequency of the tuned circuit built into the input pen 8 lags the phase of the voltage by a predetermined angle. , Therefore, the phase of the received signal Q also lags the phase of the input signal P by a predetermined angle. If the processing device 18 detects that this phase difference has occurred, it is possible to detect whether the switch 92 is ON or OFF. Therefore, in the embodiment shown in FIG. 1, when drawing characters or figures, the desired characters or figures can be input into the position detection device by turning on the switch 92 with the fingertip holding the input pen 8.

In the embodiment shown in FIGS. 4 and 5, in order to draw characters or figures on the input/output panel 2, the input pen 8 is brought into contact with the surface of the input/output panel 2 (touched). At this time, apply a slight amount of force as you would when using a regular fountain pen. When receiving this force, the pen tip 84 bends slightly and moves in a direction perpendicular to the axial direction of the pen shaft, causing the pen tip 84 and the coil 86 to
The gap between the two becomes slightly larger. Therefore, the capacitance of the stray capacitance 98 interposed between the pen tip portion 84 and the coil 86 changes, and this change in capacitance causes a change in the phase difference between the current and voltage flowing through the tuning circuit. Therefore, when this change in phase difference occurs, input to the position detection device can be performed. That is, position coordinates are displayed and stored by bringing the input pen 8 into contact with the flat surface of the input/output panel 2 like when using a fountain pen. When the pen tip 84 is separated from the surface of the input/output panel 2, the pen tip 84 is restored from its bent state due to its own elastic force to the state before pressure was applied.

In the embodiment shown in FIGS. 6 and 7, when the pen is touched, the pen tip 84 is slightly bent, and the pen tip 84 is peeled off from the dielectric 102, and as shown in FIG. A gap G is created. A capacitor is formed by the pen tip portion 84 and the metal plate 100, and the capacitance C of this capacitor is
is, C=ε・S/d (ε: dielectric constant, S: area of electrode plate, d:
Since the distance between the electrode plates is expressed as follows, as described above, when the distance between the pen tip 84 and the metal plate 100 increases, d changes and the capacitance C of the capacitor changes. Therefore, since a change occurs in the phase difference between the current and voltage flowing through the tuning circuit, it is possible to manually apply power to the position detection device when this phase difference changes. Therefore, position coordinates are displayed and stored only when the pen is touched. Note that if the pen tip section 84 is separated from the input/output panel 2,
The pen tip portion 84 is restored to its original state by its own elastic force.

In the embodiments described above, ink is not allowed to pass through the pen nib 84, but ink is allowed to pass through the pen nib 84 by applying a moisture-proof and waterproof finish to the ferrite core and coil 86 by coating with silicone or the like. be able to. When passing ink, as shown in FIG. 3, a crevice is cut into the nib portion 84 to guide the flow of ink, similar to the nib of a fountain pen or the like. In addition, there are so-called dip pen type ones in which the pen tip part 84 is immersed in an ink pot,
It does not matter if it is of a type in which cartridge ink is loaded into the pen shaft portion 80. Particularly when cartridge ink is used, the writing experience is closer to that of writing with a fountain pen. Moreover, if you fix a piece of paper on the input/output panel 2, you can actually draw characters or figures on the piece of paper, and at the same time, the position detection device displays and stores it, and further processes such as printing can be performed. can be done.

Furthermore, in the embodiments described above, the position indicator is cordless, that is, the position indicator has a built-in tuning circuit that corresponds to the frequency of radio waves emitted from the position detection device. This idea can also be used in containers. For example, it can also be applied to the "position detection device" disclosed in Japanese Patent Publication No. 3-68408. In this case, a means (a bar magnet in the embodiment) for indicating the position to the position detection device may be provided near the pen tip. Additionally, in this case, the thickness of the lines displayed on the display can be changed according to the pressure of the pen tip, so that the lines can be displayed as if they were actually written on paper with a fountain pen. Furthermore, JP-A-1-53223
If used in the ``coordinate input device'' of the issue, it is possible to display the thickness of a line on a display as if it were actually written on paper with a fountain pen, without the need for a magnet as described above.

[Effect of idea]

As explained above, according to the position indicator according to this invention, since the pen tip is provided at the tip, when inputting with this position indicator, the user feels as if he is writing with a fountain pen. Therefore,
By increasing the shape of the position indicator to resemble a fountain pen, it has the effect of improving taste and taste.

Further, since the coil constituting the tuning circuit is arranged near the pen tip, the input position and the detection position can be made to almost match, allowing highly accurate input.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of this invention; Fig. 1 is a cross-sectional view of the tip of the position indicator cut in the longitudinal direction, Fig. 2 is a configuration diagram of the tuning circuit,
FIG. 3 is a perspective view showing the appearance of this position indicator. 4 and 5 show other embodiments, with FIG. 4 being a sectional view corresponding to FIG. 1, and FIG. 5 being a configuration diagram of a tuning circuit corresponding to FIG. 2. 6th
7 and 7 show still another embodiment, FIG. 6 is a sectional view corresponding to FIG. 1, and FIG. 7 is a sectional view similar to FIG. 6 showing a state in use. 8 to 10 are diagrams for explaining the outline of the position detection device, FIG. 8 is a configuration diagram of the position detection device, and FIG. 9 is a sectional view taken along the line - in FIG. are omitted, and the 10th
The figure is a configuration diagram of a position detection control circuit and a position detection section. 2... Input/output panel, 4... Control device, 6...
Power supply device, 8...Input pen (position indicator), 10
...Position detection section, 80 ... Pen shaft section, 82 ... Cap, 84 ... Pen tip section, 86 ... Coil, 8
8... Capacitor, 90... Variable capacitor, 9
2...Switch, 94...Capacitor, 96...
Ferrite core, 98... Stray capacitance, 100...
Metal plate, 102...dielectric material.

Claims (1)

[Claims for Utility Model Registration] (1) By incorporating a resonant circuit consisting of a coil and a capacitor, it tunes to the radio waves emitted from the tablet and transmits the electromagnetic field caused by the tuning to the tablet; The position indicator indicates a position on the tablet, and the coil of the resonant circuit and a metal piece shaped like a pen tip are provided at the tip of the position indicator so that the pen tip covers the coil. The pen tip is configured to be able to change and repair itself in a direction perpendicular to the axial direction by applying and releasing pressure, and by changing the stray capacitance between the pen tip and the coil in accordance with the pressure. . A position indicator, characterized in that the position of the position indicator and a change in the pen tip are notified to the tablet by changing the tuning frequency of the resonant circuit. (2) The position indicator according to claim 1, wherein the coil is wound around a ferrite core. (3) The pen tip is characterized in that, when a dip pen or cartridge ink is used, a crack is formed in the center of the pen tip so that the ink can be guided to the tip of the pen tip. 2
The position indicator described in any of the above. (4) By incorporating a resonant circuit consisting of a coil and a capacitor, it tunes to the radio waves emitted from the tablet, transmits the electromagnetic field caused by the tuning to the tablet, and indicates the position on the tablet. The position indicator is composed of two metal pieces with a dielectric interposed between them, one of the metal pieces having a pen tip shape is provided at the tip of the position indicator, the metal piece having the pen tip shape is A variable capacitance capacitor is configured to be detachable and repairable from the dielectric by applying and removing pressure, and a resonant circuit is configured by connecting the capacitor to a coil, and the resonance circuit is configured to be resonant with the pressure. A position indicator characterized in that, by changing the tuning frequency of a circuit, the position of the position indicator and the change in the pen tip due to the pressure are notified by an electromagnetic field transmitted to the tablet. vessel. (5) The position indicator according to claim 4, wherein the coil is wound around a ferrite core. (6) A claim characterized in that the metal piece having the shape of a pen tip has a crack formed in the center so that the ink can be guided to the tip of the pen tip when a dip pen or cartridge ink is used. The position indicator according to claim 4 or 5.