JPH0517731U - Electromagnetic induction type digitizer position indicator - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The operating means of the position indicator should be made non-contact to extend the service life. [Configuration] Coil 11 and capacitor 12 of position indicator 1
Since an LC resonance circuit that resonates at a predetermined frequency is formed, a resonance current is generated in the position indicator 1 and a new magnetic field is directed from the coil 11 of the position indicator 1 to the tablet. Occurs. A plurality of attribute identifying coils 131, 132, 1 for changing the type of magnetic field
33 and 134 and a plurality of operation means 14 provided corresponding to each of these attribute identifying coils are provided, and a core 141 is provided in each, and this core is inserted into and removed from the corresponding attribute identifying coil. By doing so, the type of magnetic field generated from the coil 11 of the position pointing device 1, that is, different frequency or different phase can be given to each operating means 14. In this way, as the operating means, a contactless operating means is used instead of the conventional switch with contacts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a digitizer for reading designated position coordinates on a surface and, more particularly, to a device for reading by utilizing an electromagnetic induction phenomenon.

[0002]

[Prior Art]

 Generally, an electromagnetic induction type digitizer of this type has a tablet plate in which a plurality of grid lines are spread in the XY directions, and a processing circuit which detects and processes the voltage induced in the plurality of grid plates of the tablet plate. And a tablet consisting of. Further, the tablet further has a position indicator as a magnetic field generating means for generating a magnetic field with respect to the plurality of grid lines. When the position indicator is positioned at any position on the tablet plate of the tablet and a switch provided on the position indicator is operated, a predetermined magnetic field is generated from the position indicator. Then, this magnetic field acts on a plurality of grid lines provided on the tablet plate, and a predetermined voltage is induced on these grid lines by an electromagnetic induction phenomenon. The processing circuit on the tablet side was configured to take out this induced voltage and detect the pointing position of the position pointing device.

Further, some devices of this type have a means for informing the tablet side of what the position indicated by the position indicator means. For example, if you make a straight line from one position on the tablet plate to another position, the position indicator points to two points on the tablet plate and an operation to generate a magnetic field is performed on the two points. Be seen. Then, a straight line between these two points is drawn on, for example, a CRT screen connected to this tablet device. In this case, it may be desired to display different colors when performing such an operation. In such a case, this can be achieved by providing a plurality of operating means on the position indicator side and previously giving a specific meaning (attribute) to each of these operating means. Specifically, by operating a plurality of operating means, it is configured to change the frequency, phase, etc. of the magnetic field generated from the position indicator. For example, if there are several frequencies in the magnetic field from the position indicator side, the processing circuit on the tablet side can detect the frequency of the induced voltage, so the frequency of the magnetic field generated from the position indicator is Can be recognized and the attributes of the pointing device can be known.

As described above, the position indicator of the conventional electromagnetic induction type digitizer is generally configured so as to be able to generate a plurality of types of magnetic fields. As a specific configuration, a method was used in which various loads were switched and connected to the magnetic field generation circuit of the position indicator by a plurality of switches.

[0005]

[Problems to be solved by the device]

 As described above, the conventional position indicator of this type changes the generated magnetic field by connecting or disconnecting various loads using a plurality of switches. A digitizer having this kind of position indicator is often used, for example, by being connected to a CAD device, and the switch is frequently turned on and off. Therefore, the switch has a drawback that its function as a switch deteriorates due to wear of its contacts. This invention was made to improve this point.

[0006]

[Means for Solving the Problems]

 For this reason, in this invention, an operating means for changing the circuit constant of the magnetic field generating circuit of the position indicator in a non-contact manner is provided.

[0007]

[Action]

 Since the contactless operating means is configured to change the magnetic field generated by the position indicator, the service life is extended.

[0008]

【Example】

 1 to 4 show respective embodiments of the position indicator according to the present invention. FIG. 1 shows a circuit configuration of a position indicator used in a so-called magnetic field exchange type cordless digitizer, FIG. 2 is a circuit configuration of a position indicator of an ordinary cordless digitizer, and FIG. 3 is a contactless operation means of the position indicator. An example is shown, and FIG. 4 shows a circuit configuration of another position indicator.

First, referring to FIG. 1, a position indicator that can be used in a so-called magnetic field exchange type cordless digitizer will be described. The position indicator shown in FIG. 1 can be used, for example, in a so-called magnetic field transfer type digitizer described in Japanese Patent Laid-Open No. 59-3537. This digitizer device has a plurality of drive line groups extending in the X direction and a plurality of sense line groups extending in the Y direction on a tablet plate. Then, for example, an alternating current having a predetermined frequency is sequentially supplied to the drive line group extending in the X direction. A magnetic field having a predetermined frequency is generated from a specific drive line by this alternating current, and the coil 11 of the position indicator 1 as shown in FIG. 1 is excited. Since the coil 11 and the capacitor 12 form an LC resonance circuit that resonates at a predetermined frequency, a large resonance current that resonates in the magnetic field of the alternating current flowing through the drive line is generated in the position indicator 1. Therefore, a new magnetic field is generated from the coil 11 of the position indicator 1 toward the tablet by this resonance current, and the function as a position indicator can be achieved.

In the position indicator shown in FIG. 1, a plurality of attribute identifying coils 131, 132, 133 and 134 are provided in order to change the kind of magnetic field generated by such a magnetic field transfer type position indicator. A plurality of operating means 14 are provided corresponding to each of these attribute identifying coils. Each operating means 14 is provided with a core 141, and by inserting / removing this core into / from a corresponding attribute identifying coil, the type of magnetic field generated from the coil 11 of the position indicator 1, that is, different frequency or different. The phase can be provided for each operating means 14.

The position indicator 1 shown in FIG. 2 is used for an ordinary cordless digitizer, and is the position indicator shown in FIG. 1 provided with an alternating current source 15. It is configured so that various magnetic fields can be generated according to the alternating current from the alternating current source 15.

FIG. 3 is a diagram for explaining a method of attaching the operating means 14. The position indicator 1 is provided with a printed circuit board 16 for forming a magnetic field generating circuit thereof, and a plurality of attribute identifying coils are installed on the printed circuit board 16. For example, to describe the first operating means 14, the first attribute identifying coil 131 is installed at a predetermined position on the printed board 16. The operating means 14 having the core 141 is supported by the attribute identifying coil 131 so as to be removable. The core 141 penetrates into the attribute identifying coil 131 when the operating step 14 is pushed in, and has an inductance different from that when the operating step 14 is not pushed in.

Therefore, in the position indicator shown in FIG. 1 or 2, five kinds of different magnetic fields can be generated even when the operating means 14 is not operated. By providing a circuit (not shown) for discriminating between these different magnetic fields (for example, a device having a frequency discriminating circuit is disclosed in Japanese Patent Laid-Open No. 2-178823), five types of magnetic fields can be obtained. The attributes can be identified.

The position indicator 1 shown in FIG. 4 relates to the device of the second embodiment according to the present invention, and is inserted into and removed from the two capacitors 121 and 122 by the operating means of the position indicator 1 which is not shown. It has two dielectrics 123 and 124. Since the capacities of the capacitors 121 and 122 can be changed by removing and inserting the dielectrics 123 and 124, the position indicator 1 can also generate a plurality of types of magnetic fields.

[0016]

[Effect of the device]

 As described above, according to the present invention, it is possible to implement the position indicator capable of generating a plurality of magnetic fields by the non-contact operation means, and it is possible to provide the position indicator having a long life.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a position indicator according to an embodiment of the present invention.

FIG. 2 is a structural explanatory view of a position indicator according to another embodiment of the present invention.

FIG. 3 is a configuration diagram showing an example of operating means of the position indicator shown in FIGS. 1 and 2.

FIG. 4 is a structural explanatory view of a position indicator according to a second embodiment of the present invention.

[Explanation of symbols]

 1: Position indicator 11: Magnetic field generation coil 12: Capacitor 13: Attribute identification coil 14: Operating means

Claims (2)

[Scope of utility model registration request] 1. A position indicator having a coil and a capacitor as magnetic field generating means, a tablet provided with a plurality of grid line groups for receiving a magnetic field from the position indicator and inducing a voltage, and a plurality of tablets of the tablet. In the position indicator of the electromagnetic induction type digitizer, which takes out the voltage induced in the grid line group, detects the position indicated by the position indicator, and identifies the attribute of the position indicator, the position indicator is At least a magnetic field generating coil for generating a magnetic field and a plurality of attribute identifying coils for giving changes to the generated magnetic field are provided, and the above-mentioned position indication is provided in a one-to-one correspondence with these attribute identifying coils. A pointing device for an electromagnetic induction type digitizer, comprising a plurality of operating means for respectively changing the inductance of the circuit of the device. 2. A position indicator having a coil and a capacitor as magnetic field generating means, a tablet provided with a plurality of grid line groups for receiving a magnetic field from the position indicator and inducing a voltage, and a plurality of tablets of the tablet. In the position indicator of the electromagnetic induction type digitizer, which takes out the voltage induced in the grid line group, detects the position indicated by the position indicator, and identifies the attribute of the position indicator, the position indicator is At least a magnetic field generating coil for generating a magnetic field and a plurality of attribute identifying capacitors for changing the generated magnetic field are provided, and the above-mentioned position indication is provided corresponding to the attribute identifying capacitors in a one-to-one correspondence. A pointing device for an electromagnetic induction type digitizer, comprising a plurality of operating means for changing the capacitance of a circuit of the device.