JPH0548028U - Cordless digitizer - Google Patents

Abstract

(57) [Summary] [Purpose] In an electromagnetic induction type cordless digitizer,
The position indicator is provided with a plurality of switches, and the operating states of the switches are identified efficiently and accurately. [Structure] The position indicator is a processing device that selectively short-circuits a plurality of coils provided at different positions according to the operating state of the switch and connects the coils to the receiving coil group of the tablet.
A means for obtaining a reception pattern corresponding to the plurality of coils of the short-circuited position indicator is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic induction type cordless digitizer, in which a so-called position indicator is provided with a plurality of switches so that a plurality of input states can be detected.

[0002]

[Prior Art]

 In this type of cordless digitizer, a plurality of switches are generally provided on the position indicator, and the position indicator is provided with means for identifying the switch state. FIG. 3 is a configuration explanatory view showing an example of a cordless digitizer having such identification means. An alternating current sequentially sent from the drive circuit 3 is supplied at a predetermined time interval to the transmitting coil group 2 and a magnetic field of the transmitting coil group 2 generated by the supply of the alternating current is combined to generate a predetermined acting magnetic field. The position indicator 6, the receiving coil group 1 in which a predetermined induced voltage is generated due to the influence of the magnetic field acting by the coils of the transmitting coil group 2 and the position indicator, and the voltage signal induced in the receiving coil group 1 are detected. And a processing device 5 for controlling the drive circuit 3 and the sense circuit 4 and detecting the indicated position and the switch state of the position indicator 6 based on the voltage signal obtained from the sense circuit. ing. The identification means for identifying the switch state of the position indicator 6 of the processing device 5 is provided with means for switching the load of the coil provided in the position indicator 6 in accordance with the operating states of the plurality of switches, and the magnetic field acting on the means. Different types are used to detect the level of the voltage induced in the receiving coil group 1 installed on the tablet side (Fig. 4).

[0003]

[Problems to be solved by the device]

 In such a conventional device, it is desirable to make the difference or type (for example, level difference) of the magnetic fields acting according to the operating state of each switch as large as possible in order to make an accurate determination. This is because identification can be facilitated by increasing the difference. However, in this case, there is a problem that the number of identifiable switch operation states cannot be too large. The present invention was made to improve this point, and it is possible to identify many states and to provide a device that can be accurately discriminated.

[0004]

[Means for Solving the Problems]

 Therefore, in the present invention, a magnetic field action is generated between the coil group arranged in a predetermined direction and the coil or the magnetic body of the position indicator, and the plurality of coils of the coil group have the position indicator. In the cordless digitizer, which is configured to generate a predetermined voltage related to the position to be pointed, and which has a processing unit for detecting the induced conductive pressure generated in each coil and determining the pointed position of the position pointer, A plurality of coils or magnetic bodies arranged at different positions in the container, and a switch means for controlling ON / OFF of the action of the coils or magnetic body, and the processing device is provided with an ON / OFF state of the switch means. Identification means was provided for identification.

[0005]

[Action]

 The magnetic field applied by the coil or magnetic substance of the position indicator by each switch is a combination of the action of a plurality of coils or magnetic substances arranged in the position indicator. Due to this magnetic field, the induced voltage pattern generated in the coil group arranged on the tablet is different. The switch state can be identified by detecting and identifying the induced voltage pattern by the processing device.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The apparatus shown in FIG. 1 is a schematic explanatory view related to an embodiment of the present invention. In FIG. 1, the relationship between the receiving coil group 1 and the plurality of coils of the position indicator 6 is shown. As shown in FIG. 2, the position indicator 6 has three coils (position determination coil 61, first attribute identification coil 62 and second attribute identification coil 63), and the position determination coil 61 is As shown in FIG. 1, the receiver coil group 1 is composed of a single coil that has a size that substantially matches the width of each loop coil and that is short-circuited regardless of the switch. On the other hand, the first attribute identifying coil 62 and the second attribute identifying coil 63 are configured as a coil body having a smaller size than the position determining coil 61, as shown in the figure, and each of them has three switches S1, It is connected to S2 and S3. When only the switch S1 is closed, the position determining coil 61 and the second attribute identifying coil 63 are effective in the position indicator 6, and when the switch S2 is closed, the second position determining coil 61 and the second attribute identifying coil 63 are used. The first attribute identifying coil 62 is effective together with the position determining coil 61 instead of the attribute identifying coil 63, and when the switch S3 is closed, the three coils 61, 62 and 63 are all effective. When all the switches are open, only the position determining coil 61 is valid. Therefore, in this embodiment, the four switch operating states including the fact that all the switches are opened can be identified.

Now, consider that the coils 61, 62, 63 of the position indicator 6 shown in FIG. 2 are in the state as shown in FIG. For example, if the transmitting coil group 2 or the like as shown in FIG. 3 acts or the position indicator 6 itself has a magnetic field generating means, the switch S3 shown in FIG. 2 is connected, and each of the three coils 61, When all 62 and 63 generate an effective acting magnetic field, the maximum voltage is induced in the loop coil (Fig. 1) indicated by the order "0" as shown in Fig. 5, and the orders "4" and "-4" are given. A peak voltage of opposite polarity is generated in the loop coil indicated by "." This has a symmetrical shape when the loop coil having the rank "0" is centered.

Next, when the switch S2 shown in FIG. 2 is connected, the position determining coil 61 and the first attribute discriminating coil 62 become effective in the coil of the position indicator 6, so that as shown in FIG. ] And a peak voltage is induced in the loop coil shown in the order "4". Similarly, when the switch S1 is connected, peak voltages are induced in the loop coils of the ranks "0" and "-4" respectively (Fig. 7). As shown in, a large induced voltage is generated in the loop coil of the order "0" due to only the action of the position determining coil 61.

Therefore, in the processing apparatus of this embodiment, the position where the maximum positive peak value is detected (the position of the loop coil) when the upper peak is the positive peak in FIGS. Is a pointing position of the position indicator 6, and has a peak detecting means for detecting whether or not a negative peak value exists in the loop coils at symmetrical positions on the left and right around the maximum positive peak value. The operating state of each switch can be identified by the detection results of these peak values.

[0010]

[Effect of the device]

 As described above, according to the present invention, in the electromagnetic induction type cordless digitizer, the plurality of switches of the position pointing device can be efficiently and accurately identified.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a receiving coil group and a position indicator coil group according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of each part of the position indicator of FIG.

FIG. 3 is a diagram illustrating the configuration of a general electromagnetic induction digitizer.

FIG. 4 is a schematic diagram showing an example of switch identification of the digitizer shown in FIG.

5 is a signal diagram showing a state in which a switch S3 of the position indicator shown in FIG. 2 is connected.

6 is a signal diagram showing a state in which a switch S2 of the position indicator of FIG. 2 is connected.

7 is a signal diagram showing a state in which a switch S1 of the position indicator shown in FIG. 2 is connected.

8 is a signal diagram showing a state in which all switches of the position indicator of FIG. 2 are opened.

[Explanation of symbols]

 1: Receiving coil group 6: Position indicator

Claims (1)

[Scope of utility model registration request] 1. A magnetic field effect is generated between a coil group arranged in a predetermined direction and a coil or a magnetic body of a position indicator, and a plurality of coils of the coil group are positioned by the position indicator. A cordless digitizer having a processing device configured to generate a predetermined voltage related to the coil, detecting an induced voltage generated in each of the coils, and determining a pointing position of the pointing device. A plurality of coils or magnetic bodies arranged differently from each other and a switch means for controlling ON / OFF of the action of the coil or magnetic body are provided, and the processing device is provided with an identification means for identifying an ON / OFF state of the switch means. A cordless digitizer characterized by that.