JPH07334291A - Digitizer - Google Patents

Abstract

PURPOSE:To decide the exact indicated position of a pen-shaped position indicator by detecting the inclination of the position indicator from an output signal from an inclination detection grid. CONSTITUTION:A grid 1 for inclination detection is composed of a plate-shaped substrate 11 composed of an insulating member equipped with prescribed thickness Q, first conductor 12 for outputting a signal (a) while being alternately arranged on the front and rear surfaces of the substrate 11 in the form of a turning zigzag pattern in a plan view, second conductor 13 for outputting a signal (b) while being insulated from the first conductor 12 and alternately arranged on the rear and front surfaces of the substrate 11 in the same zigzag pattern in a plan view opposite to the first conductor 12, and differential amplifier 14 for outputting difference (c) between the signals outputted from these two conductors. A controller calculates the indicated position coordinate of the conductor of a position indicator 2, simultaneously detects the inclining state of the position indicator 2 from the output signal of the grid 1 for inclination detection and corrects the calculated indicated position coordinate of the conductor of the position indicator 2 according to a corrected value corresponding to the detected inclining state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention determines the coordinates of a pointing device on the basis of a signal generated by electromagnetically coupling a plurality of conductors arranged on a tablet and a conductor of a pen-shaped pointing device. For more details on the digitizer to decide,
Even if the pen-shaped position indicator is tilted,
The present invention relates to a digitizer capable of accurately determining its coordinate position.

[0002]

2. Description of the Related Art As a conventional digitizer of this type, there is an electromagnetic induction type digitizer as shown in FIG. 9. In the figure, numeral 31 is a drive line group in which a plurality of drive coils are arranged at predetermined intervals in the Y direction. 311 is a drive circuit for selecting and connecting a specific drive coil from this drive line group to apply an AC signal, 2 is a position indicator having a resonance circuit including a coil 21, a capacitor 22, and a switch 23, and 32 is a plurality of position indicators. A sense line group in which sense coils are arranged at a predetermined interval in the X direction, 321 is a sense circuit for selecting and connecting a specific sense coil from this sense line group to take out a signal induced, and 5 is a drive circuit 311 and a sense circuit. It is a utilization circuit that controls the circuit 322 and is connected to a host device such as a computer. In this electromagnetic induction type digitizer, a drive circuit 311 selects a specific drive coil from a plurality of drive line groups 31 and applies an AC signal thereto. At this time, when the position indicator 2 is close to the selected drive coil, a voltage is excited in the resonance circuit of the position indicator 2 by mutual induction. Further, the current excited in the position indicator induces a voltage in the nearby sense coil due to the interaction. At the timing of selecting a specific drive coil, the utilization circuit 5 controls the sense circuit 321 to sequentially select and connect the sense coils and detect the voltage output from each.

In this digitizer, the voltage induced in the sense coil 32 when the pointing device 2 points on the tablet 6 is shown in FIG. 10 (a) with respect to the central position of the coil 21 of the position pointing device 2. The characteristic characteristic that the output distribution is as shown is held in advance as data, and the position indicator 2 is determined by the addresses of the sense coil 32 and the drive coil 31 that detect the above voltage based on this output characteristic.
It is configured to calculate and calculate the indicated position A of.

[0004]

In the conventional device,
Using a pen-shaped position indicator 2 as shown in FIG. 10 as a position indicator, with respect to the coil arrangement surface of the tablet 6,
The voltage induced in the sense coil 32 when the position pointing device 2 is pointed vertically has an output distribution as shown in FIG. However, for example, when the position pointing device 2 is tilted with respect to the coil arrangement surface of the tablet 6 and is pointed, the distribution characteristic of the output voltage induced in the sense coil 32 changes as shown in FIG. Resulting in. That is, in the conventional device, even when the position indicator is tilted to indicate, the output before changing the detection voltage of the sense coil and the address of each coil (that is, when the position indicator is positioned vertically) Since the designated position is calculated based on the characteristics, there is a problem that an error occurs in the determined position coordinates. Further, since the position coordinate B calculated by the tablet is the position of the coil 21 of the position indicator 2, when the position indicator 2 in the pen shape is tilted and designated, the calculated position coordinate B and the actual position are calculated. Indicator 2
However, the position coordinates A pointed by the pen tip do not match, and the position coordinate pointed by the pen tip of the position indicator 2 cannot be precisely detected.

The present invention has been made in view of these problems, and provides a digitizer capable of detecting an inclination of a pen-shaped position indicator and correcting an error to determine an accurate pointed position of the position indicator. The purpose is to provide.

[0006]

In order to achieve the above object, in the digitizer of the present invention, the tilt detecting grid of the pointing device which is electromagnetically coupled to the conductor of the pointing device and outputs a signal is used. The control device is configured to obtain the tilt direction and the magnitude of the tilt of the position indicator from the phase state and level state of the output signal of the tilt detection grid. Also, the conductor for determining the position of the position indicator is used as the inclination detecting means of the position indicator. In addition, two conductor grids in a zigzag pattern which are insulated from each other are arranged so as to alternate in the vertical direction of the tablet plane via plate members, and the output signal from this inclination detection grid is used. It is configured to detect the tilt of the position indicator.

[0007]

The controller of the digitizer calculates the pointing position coordinates of the conductor of the position pointing device, and at the same time, detects the tilted state of the position pointing device from the output signal of the tilt detecting grid, and the correction value according to the detected tilted state. Thus, the calculated pointing position coordinates of the conductor of the position pointing device are corrected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The digitizer of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a tilt detecting grid of a position indicator used in a digitizer of the present invention. The tilt detecting grid 1 includes a plate-shaped substrate 11 made of an insulating material having a predetermined thickness Q and a plan view rotation. First conductors 12 which are alternately arranged on the front and back surfaces of the substrate 11 in a zigzag pattern and output the signal a, and the first conductors 12 which are insulated from the first conductors 12 and have the same zigzag pattern in plan view. The second conductor, which is alternately arranged on the back surface and the front surface of the substrate 11 so as to be opposite to the conductor 12, and outputs the signal b, and outputs the difference c between the signals output from these first and second conductors. The differential amplifier 14 includes The inclination detecting grid of the position indicator in the figure is for detecting the inclination of the position indicator in the X direction, and the first and second conductors 12 and 13 are parallel to the Y axis in the figure and predetermined in the X direction. The conductors are formed in a pattern arranged at intervals P of X, and each conductor is X-shaped on the front and back surfaces of the substrate 11.
The conductors adjacent to each other in the direction are arranged alternately on the front and back sides. Further, one ends of the conductors 12 and 13 are grounded, the other end of the first conductor 12 is a negative input terminal of the differential amplifier 14, and the other end of the second conductor 13 is a differential amplifier 14. Connected to the positive input terminal.

The tablet has the same structure as the detecting grid for detecting the tilt in the X direction, and detects the tilt in the Y direction of the position indicator having the conductor pattern rotated by 90 degrees. As shown in FIG. 5, these X-direction and Y-direction tilt detection grids are stacked on the tablet 6 together with the conductor grid 3 for detecting the designated position coordinate of the position indicator 2. When the position indicator 2 is placed on the tablet 6, the position indicator 2 is electromagnetically coupled to the coordinate detecting grid 3 and at the same time interacts with the conductor of the tilt detecting grid 1 to cause a voltage. Induce.

FIG. 2 is a view for explaining the principle of the tilt state detecting method of the position indicator 2 by the tilt detecting grid 1. Also in the digitizer of the present invention, the position of the pen coil 21 of the position indicator including the error amount due to the inclination of the position indicator from the output signal of the conductor grid 3 for detecting the position coordinates of the position indicator is similar to the conventional device. Coordinate values are calculated. Now, the X coordinate of the pen coil 21 of the position indicator calculated from the output of the conductor grid 3 is an intermediate point Xn (= P in the X direction in Pn of the tilt detection grid 1 shown in FIG. 1).
/ 2).

First, when the position indicator 2 is positioned so as to be perpendicular to the plane of the tablet 6, that is, the substrate 11, as shown in FIG. Currents having the same amplitude and phase are induced in the second conductors 12 and 13 as shown in FIG. That is, the intermediate position X between the first and second conductors 12 and 13
In n, when the position indicator 2 is positioned vertically with respect to the tablet 6, the positional relationship between the pen coil 21 of the position indicator 2 and the first conductor 12, and the pen coil 21 and the second conductor of the position indicator 2 Since the positional relationship of 13 is the same,
The signals a and b output from the conductors 12 and 13 have the same amplitude and phase. Therefore, the differential amplifier 1
The output signal c from 4 has an amplitude of 0.

Next, as shown in FIG. 2B, when the position indicator 2 is positioned to be tilted in the direction a from the vertical direction of the tablet 6, the conductor on the side where the position indicator is tilted, that is, Since the first conductor 12 has a stronger degree of electromagnetic coupling than the second conductor 13, as shown in FIG. 3B, the amplitude is larger than that of the signal when the position indicator is vertically positioned. Is output from the first conductor 12. On the contrary, the signal b whose amplitude is small is output from the second conductor 13.
Is output. Therefore, the differential amplifier 14 outputs a signal c having a phase opposite to that of the signals induced in the conductors 12 and 13 and having a predetermined amplitude. Similarly, FIG. 2 (c)
When the position indicator 2 is tilted in the direction b from the vertical direction of the tablet 6 as shown in FIG. 3, the conductor on the side where the position indicator is tilted, that is, the second conductor 13 is the first conductor. Since the degree of electromagnetic coupling is stronger than that of the conductor 12 of FIG.
As shown in (c), the signal b whose amplitude is larger than the signal when the position indicator is vertically positioned is the second signal.
Is output from the conductor 13. On the contrary, the first conductor 12 outputs the signal a having a small amplitude. Therefore, the differential amplifier 14 outputs a signal c having the same phase as the signals induced in the conductors 12 and 13 and having a predetermined amplitude.

As described above, the inclination direction of the position indicator 2 is detected from the phase of the output signal c from the differential amplifier 14 of the inclination detection grid 1 of the position indicator, and the degree of inclination is detected from the amplitude. You can Further, the output signal c of the operational amplifier 14 is the calculated position X of the pen coil 21.
Since n has a constant characteristic according to the inclination state of the position indicator 2 at this position, the calculation is performed based on the output distribution characteristic shown in FIG. 10B according to each inclination and position. The correction value Δd for correcting the error in the coordinate position of the pen coil 21 and converting the corrected coordinate position of the pen coil into the position coordinate actually instructed by the pen tip 20 of the position indicator is preset. Values are calculated or measured, and stored and held as a correction value data table in the storage device of the apparatus.

FIG. 4 shows a correction value Δ corresponding to the X coordinate of the pen coil 21 calculated from the output of the conductor grid 3 and the signal c output from the differential amplifier 14 of the tilt detection grid 1.
It is a schematic explanatory drawing which shows the data table of d. The calculated values X0, X1, ..., Xn, ... In the figure are the conductor grids 3.
In the X coordinate of the pen coil 21 calculated from the output of, the other tilt states θ0, θ1, ..., θn, ... Of the signal c output from the operational amplifier 14 of the tilt detecting grid 1 of the position indicator. A value that represents the magnitude of phase and amplitude,
Each is set according to the resolution required for the digitizer,
The corresponding correction value Δd is calculated or measured in advance and stored and stored.

Further, like the data table 51 of the correction value concerning the X coordinate, the pen tip position of the position indicator is detected from the calculated Y coordinate of the position indicator and the output of the tilt detecting grid in the Y direction. Y coordinate correction value table 5
2 is also available.

When the coordinates of the position indicator are detected, the utilization circuit 5 uses the pen coil 2 calculated from the output of the conductor grid 3.
1 and the output of the tilt detection grid 1 to search this data table to find a correction value, and the position coordinate of the pen coil 21 is corrected by the correction value to adjust the pen tip position coordinate of the position indicator 2. And output. For example, when the inclination state a in the case shown in FIG. 2B is θn, X
The coordinate correction value Δd is Xn, θn, and this correction value is
A positive value is stored such that the pen tip position coordinate Xα of the position indicator is calculated by adding to the calculated X coordinate Xn. Similarly, when the inclination state b in the case shown in FIG. 2C is θn, the correction values Xn and θn are negative values such that the pen tip position coordinate Xβ is calculated by being added to Xn. It is stored.

Next, the operation of detecting the designated position coordinates of the position indicator by the digitizer using this tilt detecting grid will be described. FIG. 5 is a digitizer described in the specification of Japanese Patent Application No. 4-337894 filed by the applicant of the present invention, and includes a conductor grid 3 (loop coil group, first oscillating element) arranged on the tablet 6. , An amplifying means 4 (second oscillating element) and a coil of the position indicator 2 (third oscillating element) form an oscillating system, and the position indicating is made from the output of the amplifying means when the oscillating system is in an oscillating state And a digitizer configured to determine a designated position coordinate of the container. In the figure, 6
Is a tablet body, 1 is a grid for tilt detection of a position indicator, 2 is a pen-shaped position indicator, 3 is a group of X-side loop coils 31 sequentially arranged in relation to a position in the X direction, and a position in the Y direction Y-side loop coil group 3 sequentially arranged
2 is a conductor grid, and 5 is an X-side loop coil group 31
A more specific loop coil is selected, a specific loop coil is selected from the Y side loop coil group 32, each is connected to the input side and the output side of the amplifying means 4, and the output of this amplifying means 4 is taken in to indicate the position. It is a utilization circuit that determines the indicated position of the container 2.

In this digitizer, when the position indicator 2 which is the third oscillating element approaches the loop coil 3 which is the first oscillating element, the output of the amplifying means 4 (second oscillating element) is selected. Y-axis loop coil 32 (one conductor of the first oscillating element) → coil 21 of the position indicator 2 (third oscillating element) → selected X-axis loop coil 31 (the other conductor of the first oscillating element) ) → An oscillating system is formed in the input path of the amplifying means 4 (second oscillating element), and as a result, a signal indicating the indicated position of the position indicator 2 is output from the voltage of the amplifying means 4 which is the second oscillating element. The output signal is further taken into the utilization circuit 5 so that the position coordinates of the position pointer 2 can be determined. The operation of determining the coordinate position of the position indicator of the digitizer has been described in detail in the previous application, so the description thereof will be omitted.
In addition, the position of the coil 21 of the position indicator 2 is calculated by the coordinate position determination operation of the position indicator 2.

When the oscillating system is in an oscillating state, the magnetic field generated in the coil 21 of the position indicator 2 which is the third oscillating element causes the two conductors 12 and 13 of the tilt detecting grid 1.
A voltage is induced in the position indicator 2 from the differential amplifier 14.
A signal c having an amplitude and a phase according to the slope of is output. The output signal c of the differential amplifier 14 is the phase shifter 15
The phase shifter 15 shifts the output signal c of the differential amplifier 14 by a predetermined amount, synchronizes it with the output signal of the amplification means 4 of the oscillation system, and inputs the output signal d to the synchronous detection circuit 16. . The synchronous detection circuit 16 includes an inverting amplifier 161, a non-inverting amplifier 162, and a changeover switch 16 as shown in FIG.
3, a smoothing circuit 164 and an A / D converter 165. Further, FIG. 7 shows the synchronous detection circuit 16 respectively.
The signals input to or output from are shown. The signal d output from the differential amplifier 14 and synchronized with the output signal of the oscillation system is input to the inverting amplifier 161 and the non-inverting amplifier 162 of the synchronous detection circuit 16, respectively. Further, the changeover switch 163 receives the signal e output from the current amplifier 42 of the oscillation system. This changeover switch 163 is
When the phase of the signal e is positive, the non-inverting amplifier 162 is selected and connected, and when the phase of the signal e is negative, it is switched and connected to the inverting amplifier 161.

Now, consider a case where the position indicator 2 is in the state shown in FIG. 2B and the differential amplifier 14 outputs a signal c as shown in the lower diagram of FIG. 3B.
The output e from the current amplifier 42 of the oscillation system and the output d from the phase shifter 15 at this time are shown in FIGS. 7 (a) and 7 (b), respectively.
The signal is as shown in. The changeover switch 163 selects and connects the non-inverting amplifier 162 while the signal e has a positive phase, and selects and connects the inverting amplifier 161 while the signal e has a negative phase, so that its output d ′ is , Fig. 7
The signal is as shown in (c). The signal d ′ is converted into a signal having a constant amplitude as shown in FIG. 7D by the smoothing circuit 164, further converted into a digital signal f by the A / D converter 165, and then the utilization circuit 5 is used.
Output to 0. The utilization circuit 50 determines the inclination direction of the position indicator 2 depending on whether the amplitude of the signal f input from the synchronous detection circuit 16 is positive or negative, and the inclination of the position indicator 2 based on the magnitude of the amplitude of the signal f. Detect the degree of.

As a result, the utilization circuit 50 detects the position of the pen coil 21 of the position indicator 2 calculated from the output of the oscillation system and the tilt state θ of the position indicator 2 at that position. Next, the utilization circuit 50 is based on the X and Y coordinates of the pen coil 21 of the position indicator 2 calculated from the oscillation system and the tilt states of the position indicator 2 related to the X and Y directions detected by the tilt detection grid 1. , X-coordinate, Y-coordinate correction value tables 51 and 52 are searched, the respective correction values are searched, and the calculated pointed position coordinate value of the position indicator 2 is corrected to obtain the pen tip position coordinate of the position indicator 2. Output.

FIG. 8 is a diagram showing a second embodiment of the present invention. The X-axis grid 31 for detecting the coordinate in the X direction of the position indicator in the figure is a first one in which a plurality of conductors arranged in parallel with the Y axis and at a predetermined interval W in the X direction are formed in a comb-shaped pattern. Consists of a conductor grid 313 and a second conductor grid 314 formed in the same comb-like pattern as the first conductor grid 313 and insulated from the conductor grid 313 and displaced by W / 2 in the X direction. Has been done. For the X-axis grid 31, a desired conductor is selected from the first and second conductor grids 313 and 314, and the ground (GND), the open (OPEN), the amplification means 4, the negative side of the differential amplifier 14, , Sn, which are connected to the plus side, are connected to a switch circuit 71. The lower diagram of FIG. 8 is an enlarged view showing the configuration of each switch Sn of the switch circuit 71.
In the digitizer of the second embodiment, the X-axis grid 3 is used.
A Y-axis grid 32 and a switch circuit 72, each having the same configuration as that of the first embodiment and each conductor is arranged in parallel with the X-axis, are provided.

Also in this digitizer, when the position indicator 2 which is the third oscillating element approaches the conductor grid which is the first oscillating element, the output of the amplifying means 4 (the second oscillating element) → the switch circuit 72 Y connected to the amplification means 4
Conductor of the axial grid 32 (one conductor of the second oscillation element)
→ coil 21 of position indicator 2 (third oscillating element) → conductor of X-axis grid 32 (other conductor of first oscillating element) connected to amplifying means 4 by switch circuit 71 → amplifying means 4 (third oscillating element) The oscillation system is formed in the input path of the second oscillating element), and as a result, a signal indicating the indicated position of the position indicator 2 is output from the voltage of the amplifying means 4 which is the second oscillating element. It is configured to be taken into the utilization circuit 5 and to determine the pointed position coordinates of the position pointing device 2 and the like. In the coordinate position determining operation of the position indicator of this digitizer, the utilization circuit 50 selects two conductors from the comb pattern and connects them to the utilization circuit 50 and the ground, and the connected conductors form a loop coil, that is, an oscillating element. . The other coordinate city determining operation is similar to that described in the previous application, as in the above-described first embodiment.

The switches S1 to Sn of the switch circuits 71 and 72 have their corresponding conductors grounded, opened, amplifying means 4, the negative side of the differential amplifier 14 and the positive side of the differential amplifier 14 in accordance with the control signal of the utilization circuit. It is configured to connect to either side.

Next, the tilt detecting operation of the position indicator 2 in this digitizer will be described. Now, as shown in FIG.
The coil 21 of the position indicator 2 has switches S2 and S4.
Consider the case where it is located between the conductors 3141 and 3142 connected to. The utilization circuit 50 is a switch S2.
Is connected to the input of the amplifying means 4 and the switch S4 is controlled to connect 3142 to the ground. In this state, the oscillation system is in an oscillating state, so that a voltage signal is output from the conductor 3141 and input to the amplifying means 4. At the same time, the utilization circuit 50 controls the switch S1 to connect the conductor 3131 to the positive side input terminal of the differential amplifier 14, and controls the switch S5 to connect the conductor 3133 to the negative side input terminal of the differential amplifier 14. Then, the switch S6 is controlled to connect the conductor 3134 to the ground, and further the other switches are controlled to openly connect the other conductor. At this time, a voltage is induced in the two conductors 3131 and 3133 connected to the differential amplifier 14 by the magnetic field generated in the pen coil 21 of the position indicator 2 in the oscillating state, and the position indicator 2 is emitted from the differential amplifier 14. A signal having an amplitude and a phase according to the slope of is output. The utilization circuit 50 takes in the coordinate position of the coil 21 of the position indicator 2 determined from the output signal of the amplifying means 4 which is the second oscillating element connected to the conductor 3141 and the output of the differential amplifier 14, and corrects the correction value. A value to be corrected in the X direction is searched by referring to the data table. Also in the Y-axis direction, similarly, each switch of the switch circuit 72 is controlled so that the first
The conductors on the left and right sides of the conductor of the Y-axis grid 32 forming the oscillation element of are connected to the input terminals of the differential amplifier, and the value to be corrected in the Y direction of the position indicator in the Y direction is calculated from the output of this differential amplifier. Search for. The correction method of the pointing position coordinates of these position pointing devices is the same as that of the above-mentioned first embodiment, and according to this second embodiment, the position pointing is performed using the conductor grid for detecting the pointing position coordinates of the position pointing device. Since it is possible to detect the tilt state of the pointing device, there is an effect that it is not necessary to separately provide a unique conductor grid for detecting the tilt of the position pointing device. Further, like the device of the first embodiment, the conductor pattern of the tilt detecting grid of the position indicator is formed by a comb-like pattern like the conductor pattern of the second embodiment, and this tilt detecting grid is formed separately. It may be laminated on a tablet as a conductor grid to detect the tilt of the position indicator. In this case, the utilization circuit selects two conductors that are close to each other so as to sandwich the pen coil from the position coordinates of the pen coil of the position indicator calculated from the output of the oscillation system.
If connected and configured to detect the difference between the outputs of these conductors, the tilt of the position indicator can be detected.

In the above-mentioned embodiments, the output of the inclination detection grid is constructed so as to directly detect the phase of the signal generated in the two conductors. For example, the signals output from the two conductors are rectified by the synchronous detection circuits, respectively. Then, it is processed as a DC signal, and the direction of the tilt of the position indicator is detected by detecting the positive / negative of the output signal of the differential amplifier based on the phase shift of these two signals. You may comprise so that each amount may be detected and a correction value may be calculated. In this case, in each of the above embodiments, an example in which the correction value data table is used to calculate the correction value has been shown, but the correction value is calculated each time from the tilt direction and tilt amount of the position indicator thus obtained. It may be configured as follows. Further, in the above-mentioned embodiment, the tilt detecting grid is adopted in the digitizer which forms the oscillation system by the position indicator, the conductor of the tablet and the amplifying means, and determines the indicated position of the position indicator from the oscillation state of the oscillation system. However, the coil in the position indicator may be excited by an electromagnetically coupled cordless digitizer as described in the prior art or a driving means provided in the position indicator or connected by a cord. It can also be used for various electromagnetic induction type digitizers.

[0027]

As described above, according to the digitizer of the present invention, even when the pen-shaped position indicator is used, the position indicated by the position indicator can be corrected according to the inclination of the position indicator. It is possible to accurately detect the coordinates of the position indicated by the pen tip of the position indicator.

[Brief description of drawings]

FIG. 1 is a diagram showing a tilt detection grid of a position indicator of a digitizer of the present invention.

FIG. 2 is an explanatory diagram showing the principle of tilt detection of the position indicator of the present invention.

FIG. 3 is an explanatory diagram showing an output of a tilt detection grid of the present invention.

FIG. 4 is an explanatory diagram showing a correction value data table of the present invention.

FIG. 5 is a diagram showing a digitizer of the present invention.

FIG. 6 is a diagram showing a synchronous detection circuit.

FIG. 7 is a diagram showing signals input to and output from a synchronous detection circuit.

FIG. 8 is a diagram showing a second embodiment of the digitizer of the present invention.

FIG. 9 is a diagram showing a conventional device.

FIG. 10 is an explanatory diagram showing a distribution characteristic of an output voltage induced in a tablet.

[Explanation of symbols]

 1 Tilt detection grid of position indicator 2 Pen-shaped position indicator 3 Conductor grid 4 Amplifying means 5 Utilization circuit 6 Tablet

Claims (3)

[Claims] 1. A tablet and a position indicator, wherein the position indicator of the position indicator on the tablet is based on a signal generated by the interaction between the position determining element group arranged on the tablet and the position indicating element of the position indicator. In a digitizer for determining pointing position coordinates, a first tilt detecting element that interacts with a position pointing element of the position pointing device to generate a first tilt signal on a tablet, and a position pointing element of the position pointing device. A second tilt detection element that interacts with each other to generate a second tilt signal is provided, and the phase state and level state of the generated first and second tilt signals are detected and the detected phase state is detected. And a tilt detecting means for determining the tilt direction of the position indicator and the magnitude of the tilt of the position indicator from the detected level state. . 2. A digitizer having a tablet in which a position determining element group is formed by a plurality of conductors sequentially arranged in a position determining direction, wherein the position determining element is used as a first tilt detecting element and a second tilt detecting element. A digitizer according to claim 1, characterized in that a conductor selected from the group is used. 3. The tilt detecting element has two conductor grids having two zigzag patterns which are insulated from each other, and the conductor grids alternate in the vertical direction of the tablet plane through a plate member. And outputs the difference between the signals generated by the two conductor grids by interacting with the position indicating element of the position indicator, and the phase state and level of this output signal. 2. The digitizer according to claim 1, wherein the direction of the tilt of the position indicator and the magnitude of the tilt of the position indicator are respectively detected by detecting the state.