JP2007249670A - Position indicator, position detector and computer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend the life of a built-in battery by minimizing power consumption in a position indicator. <P>SOLUTION: A signal transmitting part including a position indicating coil 11 and an oscillation circuit 12 of frequency f1 is provided at a pen tip, and a signal transmitting part including a position instructing coil 13 and an oscillation circuit 14 of frequency f2 is provided on an eraser side. A timing circuit 15 generating a rectangular wave signal of frequency is provided, and the output signal from the timing circuit 15 is directly supplied to the oscillation circuit 12, and also supplied to the oscillation circuit 14 through an inverter 16. In this circuit, each part is operated by receiving power supply from a battery not shown. In this circuit, a clock signal of a frequency having a cycle sufficiently longer than the time necessary for coordinate detection on a tablet side, for example, about 100 Hz is outputted from the timing circuit 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a position indicator, a position detection device, and a computer that are suitable for application to, for example, electromagnetic induction type position detection. More specifically, when the position indicator is incorporated with the power supply means to perform position detection, the use time of the built-in power supply can be extended.

  A position indicator used in a conventional position detecting device transmits a reflected signal in synchronization with a signal transmitted from a tablet provided with a loop coil, and the reflected signal is received by the loop coil of the tablet. The position is detected (for example, refer to Patent Document 1).

  Further, for example, in a position indicator formed in a pen shape, tuning circuits are provided at both ends of the pen shape, and on the other hand, writing information is transmitted, and on the other hand, erased information is transmitted. Some of them do this (for example, see Patent Document 2).

  On the other hand, it is possible to enhance the accuracy of position detection by increasing the transmission output by transmitting a signal using the power supply by incorporating a power supply means in the position indicator, or transmitting other identification information, etc. It has been proposed (see, for example, Patent Document 3).

That is, in the conventional position indicator, for example, writing is performed at one end of a pen-like form and erasing is performed at the other end. In such a position indicator, further power source means is incorporated to achieve better position detection. Etc. are proposed to be performed.
JP-A-2-53805 JP-A-8-96350 JP-A-10-214148

  For example, as a computer input device, a device called a so-called tablet / digitizer that detects a specified position on a board and inputs the position information is widely used. In such a tablet / digitizer, a position detection device is used to detect the designated position. Therefore, various techniques have been developed for detecting the position designated on the board. Among them, for example, an electromagnetic induction type position detection device such as the invention described in Patent Document 1 has a high detection accuracy. It is extremely effective in terms of height and reliability.

  In such an electromagnetic induction type position detecting device, a plurality of tuning circuits may be provided in the position indicator as in the invention described in Patent Document 2 for use in different applications such as writing and erasing. It is considered. In addition, as in the invention described in Patent Document 3, it has also been proposed to incorporate power supply means in the position indicator and to provide oscillation means to increase the transmission output to improve the accuracy of position detection. Further, it has been proposed to configure such a power supply means using a chargeable means such as an electric double layer capacitor.

  However, if a power supply means is built in the position indicator and a plurality of oscillation means are provided in place of the above-described plurality of tuning circuits, the consumption of the built-in power supply means depends on the number of oscillation means provided. The amount will double. Therefore, in the conventional technique, the usable time is shortened in the power supply means having the same capacity according to the number of the oscillating means provided, and the number of battery replacements is increased. Or it will be necessary to charge frequently, and the great problem of impairing the smooth operation of a position detection apparatus will arise.

  The present invention has been made in view of such problems, and an object of the present invention is to not increase power consumption significantly even if a plurality of oscillating means are provided. Thus, the number of battery replacements and the frequency of charging are reduced, and the operation of the position detection device can be performed smoothly.

  In order to solve the above problems and achieve the object of the present invention, the invention described in claim 1 includes a power supply means and a position for transmitting a signal for indicating at least the position to the position detection tablet. An indicator, comprising: a signal transmitter at a plurality of locations; and a control means for controlling each of the plurality of signal transmitters to an on state or an off state. is there.

  The position indicator according to claim 2 is characterized in that the plurality of signal transmission units are provided at least at both ends and transmit signals of the pen tip and the eraser.

  The position indicator according to claim 3 is characterized in that the control means sequentially operates a plurality of signal transmission units.

  According to a fourth aspect of the present invention, there is provided a position indicator that detects a direction directed toward the position detection tablet, and the control means is configured to detect the direction detection tablet based on the detection result of the direction detection means. The signal transmitter on the side to which it is directed is turned on.

  In the position indicator according to claim 5, the direction detecting means is a writing pressure detecting means, and the control means is configured to detect the signal transmitting unit on the side where a predetermined load or more is detected based on the detection result of the writing pressure detecting means. It is characterized by being turned on.

  In the position indicator according to claim 6, when a load exceeding a predetermined value is not detected from any of the detection results of the writing pressure detection unit, the control unit performs control to sequentially operate the plurality of signal transmission units. It is characterized by this.

  In the position indicator according to claim 7, the direction detecting means is a touch sensor means, and the control means turns on the signal transmission unit on the side where the touch is detected based on the detection result of the touch sensor means. It is characterized by.

  Furthermore, in order to achieve the object of the present invention, the invention described in claim 8 is a position indicator that includes a power supply means and transmits a signal for indicating at least the position to the position detection tablet. A position indicator having a signal transmission unit at a plurality of locations and provided with power control means for controlling transmission power in at least two stages for each of the plurality of signal transmission units.

  The position indicator according to claim 9 is characterized in that the plurality of signal transmission units are provided at least at both ends and transmit signals of the pen tip and the eraser.

  The position indicator according to claim 10 is provided with direction detecting means for detecting a direction directed to the position detecting tablet, and the power control means is based on the detection result of the direction detecting means. The transmission power from the signal transmission unit on the side directed to the outside is made stronger than the transmission power from the signal transmission unit on the other side.

  Furthermore, in order to achieve the object of the present invention, the invention described in claim 11 has a built-in power supply means, transmits a signal for instructing at least the position toward the position detection tablet, and at a plurality of locations. A position detection device having a position indicator having a signal transmission unit and provided with a power control means for controlling the transmission power of each of the plurality of signal transmission units. The position detection tablet includes a plurality of signal transmission units. The position detecting device is provided with a discriminating unit for discriminating each of the signals, and outputs information based on an instruction from the position indicator and information based on the discriminating unit.

  The position detecting device according to claim 12 is characterized in that the discriminating unit discriminates at least signals of a pen tip and an eraser provided at both ends of the position indicator.

  Furthermore, in order to achieve the object of the present invention, the invention described in claim 13 includes a power supply means, transmits a signal for indicating at least the position toward the position detection tablet, and also at a plurality of locations. A computer having a signal transmission unit and using a position indicator provided with a power control unit for controlling the transmission power of each of the plurality of signal transmission units, and for determining each of the signals from the plurality of signal transmission units And a computer that executes processing according to information based on an instruction from a position indicator and information based on determination by a determination unit.

  In the position detecting device according to the fourteenth aspect, the discriminating unit discriminates at least signals of a pen tip and an eraser provided at both ends of the position indicator.

  According to the position indicator, the position detection device, and the computer of the present invention, it is possible to improve the accuracy of position detection by incorporating the power source means in the position indicator, and even if a plurality of oscillation means are provided, power consumption is increased. Therefore, the position detecting device can be operated smoothly by suppressing the increase in consumption of the built-in power supply means, reducing the number of battery replacements and the frequency of charging.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a first embodiment of a position indicator to which the present invention is applied. In the embodiment described below, the position indicator functions are two types, ie, a pen tip (information entry) and an eraser (information erase). Different entries can be made, and more than two functions can be provided.

  In FIG. 1, a signal transmission unit including a position indicating coil 11 and an oscillation circuit 12 having a frequency f1 is provided on the pen tip side, and a signal transmission unit including a position indicating coil 13 and an oscillation circuit 14 having a frequency f2 is provided on the eraser side. Provided. In addition, a timing circuit (oscillator) 15 that generates a rectangular wave signal having a predetermined frequency with a duty of approximately 50% is provided, and an output signal from the timing circuit 15 is directly supplied to the oscillation circuit 12 as a drive signal. The voltage is supplied to the oscillation circuit 14 via the inverter 16.

  Further, in this circuit, power is supplied from a battery (not shown) to operate each part. In this circuit, the timing circuit 15 outputs a clock signal having a frequency sufficiently longer than the time required for coordinate detection on the tablet side, for example, about 100 Hz. As a result, when the clock signal is at a high level, the pen tip side oscillation circuit 12 operates, and when the clock signal is at a low level, the eraser side oscillation circuit 14 operates. Therefore, in this circuit, the power consumption on the side that is alternately inoperative is reduced.

  That is, in the first embodiment, the main factors for consuming power are the power consumed by the oscillation circuit 12 and the position indicating coil 11 connected thereto, and the power consumed by the oscillation circuit 14 and the position indicating coil 13 connected thereto. Power. On the other hand, in the first embodiment, since the pen tip side and the eraser side are controlled to operate alternately, power consumption on the non-operating side is reduced. As a result, the operator can freely use the pen tip and the eraser, and can reduce the power consumption and extend the battery life.

  Next, FIG. 2 shows a configuration of a second embodiment of a position indicator to which the present invention is applied. In FIG. 2, a resonance circuit 21 having a predetermined resonance frequency f0 including a coil 21a and a capacitor 21b is disposed on the pen tip side. On the eraser side, a resonance circuit 22 having a predetermined resonance frequency f0, which is composed of a coil 22a and a capacitor 22b, is disposed. Further, the microprocessor denoted by reference numeral 23 includes a ROM (Read Only Memory) and a RAM (Random Access Memory) not shown, and operates according to a predetermined program set in advance.

  The microprocessor 23 is connected to the oscillator 24 having the frequency f0 to generate a driving clock signal for the microprocessor 23 and a signal having the frequency f0 radiated from the resonance circuits 21 and 22. As a result, a signal having the frequency f0 is output from the terminal P0 of the microprocessor 23 at a predetermined timing. The output signal from the terminal P0 is output by the analog switch 25 to the resonance circuit 21 on the pen tip side, Or it is supplied to only one of the resonance circuits 22 on the eraser side.

  Furthermore, the microprocessor 23 is connected with a writing pressure detection unit 26 that detects writing pressure when operating on the pen tip side and a writing pressure detection unit 27 that detects writing pressure when operating on the eraser side. The pen pressure detectors 26 and 27 output the detected pen pressure as an 8-bit digital value, for example, and the microprocessor 23 operates to read these values periodically. Based on the read signal, the microprocessor 23 outputs a signal for controlling the analog switch 25 to the terminal P1. Reference numerals 28 and 29 are coupling capacitors.

  Thus, the analog switch 25 supplies a signal to the pen tip side when the signal from the terminal P1 of the microprocessor 23 is at a low level, and to the eraser side when the signal from the terminal P1 is at a high level. In this circuit, power is supplied from a battery (not shown) to operate each unit. Therefore, also in this circuit, the power consumption on the side of alternately inactivating is reduced. As a result, the operator can freely use the pen tip and the eraser, and can reduce the power consumption and extend the battery life.

  Further, FIG. 3 shows a configuration of a specific embodiment of a position pointing pen as a position pointing device adopting the above-described second embodiment. In FIG. 3, a pen tip 30 is provided at the lower left end of the drawing, and an eraser 31 is provided at the upper right end. The nib 30 and the eraser 31 simulate each stationery, and are formed of, for example, a resin product. In the vicinity of the nib 30 and the eraser 31, a coil 21a and a coil 22a are provided as position indicating coils.

  In addition, the pen tip 30 and the eraser 31 are connected to the pen pressure detection units 26 and 27 at the inner ends, respectively, and the pen pressure when the pen tip 30 and the eraser 31 are pressed becomes the pen pressure detection unit. 26 and 27 to be detected. The detected writing pressure is converted to, for example, an 8-bit digital value and supplied to a microprocessor 23 (not shown) provided on the circuit board 32. In addition, the battery 33 is incorporated in this position indicating pen, and power is supplied to the microprocessor 23 and the like on the circuit board 32.

  The operation of the position indicator according to the second embodiment is shown in FIG. That is, A in FIG. 4 shows the operation when the pen tip side is operated, and the microprocessor 23 reads the output data from the pen pressure detector 26 and the pen pressure on the pen tip side is equal to or higher than a predetermined value. The terminal P1 is fixed at a low level, and a signal is output from the terminal P0 at the timing shown in the figure. This signal is a signal having a frequency substantially equal to the resonance frequency f0 of the resonance circuit 21 as described above, and intermittent transmission is performed at a cycle of 150 μS following a continuous transmission period in which the signal is continuously output for a certain period or more.

  This intermittent transmission period is 9 times per cycle, and 1 bit is added to 8 bits of writing pressure information to distinguish between the pen tip side and the eraser side, and a total of 9 bits are sequentially transmitted. Further, as shown in the figure, in this embodiment, transmission is performed when the data to be transmitted is “0”, and transmission is not performed when the data to be transmitted is “1”, thereby representing “0” or “1”. Yes. Therefore, on the tablet side, reception is performed in accordance with these timings, and if the signal is detected, the transmission data from the position indicator can be detected as “0” if the signal is detected and “1” if the signal is not detected.

  FIG. 4B shows the operation when the eraser side is operated. The microprocessor 23 reads the output data from the writing pressure detection unit 27 and the writing pressure on the eraser side is greater than or equal to a predetermined value. Outputs a signal from the terminal P0 at a timing as shown in the figure with the terminal P1 fixed at a high level. This signal is supplied to the resonance circuit 22 and radiated at exactly the same timing as A in FIG. The operation shown in FIG. 4B is different from the operation on the pen tip side shown in FIG. 4A only in that the last bit of the data to be sent is “1”.

  Thereby, the tablet side can recognize that the reception result of the final data is “1” and recognize that the received signal is transmitted from the eraser side. FIG. 4C shows the operation when the pen pressure detection result on both the pen tip side and the eraser side is less than a predetermined value. By switching the terminal P1 between the high level and the low level alternately, The operation on the front side (A in FIG. 4) and the operation on the eraser side (B in FIG. 4) are alternately repeated. However, 8 bits of the writing pressure information in the figure are all “0”.

  As described above, in the present embodiment, intermittent transmission is performed subsequent to transmission that is continuous for a certain time or longer, so that the tablet can easily perform an operation that matches the timing of the position indicator. Further, the pen tip side and the eraser side can be distinguished even at one frequency. In addition, when neither the pen tip side nor the eraser side is operated, the pen tip side and the eraser side are operated alternately. The pen nib and the eraser can be used freely.

  In the position indicator as described above, the main factor that consumes power is the power consumed by the resonance circuit 21 and 22 supplied from the terminal P0 of the microprocessor 23 via the analog switch 25. . On the other hand, in the present embodiment, since only one of the resonance circuits 21 or 22 is operated by the analog switch 25 and the other is not operated, the power consumption is reduced and the battery life is extended. It is something that can be done.

  When either of the writing pressures is equal to or higher than the predetermined value described above and both of the writing pressures are lower than the predetermined value, the alternating pressure as shown in FIG. You may make it transfer to operation | movement. This is because the operator cannot suddenly switch from the pen side to the eraser side during normal use, and the actual operation frequently repeats the case where the pen pressure is above a certain value or not. Because it is possible. As a result, the operator can smoothly perform operations using the position indicator.

  Furthermore, in this embodiment, the analog switch 25 switches between the pen tip side and the eraser side. However, the microprocessor 23 is provided with two terminals that can output a signal of the frequency f0, and from either one. Only a signal may be output. In that case, output switching to the two terminals is controlled inside the microprocessor 23 using the signal output to the terminal P1. In this case, it is not necessary to provide an extra analog switch 25 and the number of terminals of the microprocessor 23 is the same.

  By the way, in 2nd Embodiment mentioned above, although switching with the pen point side and an eraser side is performed by each writing pressure detection, this switching can also be performed using another detection means. . FIG. 5 shows a configuration in the case where a touch sensor is used as the above-described detection unit as the third embodiment. In the following description of FIG. 5, the same reference numerals are given to the same parts as those in FIG.

  That is, in FIG. 5, electrodes 34 and 35 serving as touch sensors are provided, and rectangular wave output signals from the terminals P 2 and P 4 of the microprocessor 36 are supplied to the electrodes 34 and 35 via resistors 37 and 38. Is done. These electrodes 34 and 35 are connected to the terminals P3 and P5 of the microprocessor 36, and the potential is detected. Also in this circuit, power is supplied by a battery (not shown), and the operation of each part such as the microprocessor 36 is performed.

  In this third embodiment, for example, when the hand is not approaching the electrode 34, the rectangular signal output from the terminal P2 is detected at the terminal P3 due to slight waveform deterioration as shown in FIG. The On the other hand, for example, when the hand is approaching the electrode 34, the rectangular signal output from the terminal P2 is detected at the terminal P3 with significant waveform deterioration as shown in FIG. 6B. It will be. Therefore, by determining the change in the waveform, the microprocessor 39 can determine which of the electrodes 34 and 35 the hand is approaching.

  Further, FIG. 7 shows a configuration of a specific embodiment of the position pointing pen 39 as a position pointing device adopting the above-described third embodiment. That is, in FIG. 7, electrodes 34 and 35 are provided in the vicinity of the pen tip 30 and the eraser 31 that are sandwiched between fingers by the operator during the pen-shaped operation. Since the other internal structure is the same as that of the circuit board 35 provided with the microprocessor 36 except for the writing pressure detection units 26 and 27 from the configuration shown in FIG. 3, detailed illustration and description thereof will be omitted.

  Therefore, in this third embodiment, when the pen tip 30 or the eraser 31 is operated, the vicinity of the electrodes 34 and 35 is pinched by the operator's fingers, so that the pen tip 30 or The direction of the eraser 31 is determined. Thereby, the same processing as described in the description of FIG. 4 can be performed, and the pen tip 30 or the eraser 31 operated on the tablet side can be determined. The orientation of the pen tip 30 or the eraser 31 can be determined by changing the oscillation frequency.

  Further, FIG. 8 shows the configuration of a fourth embodiment of the position indicator according to the present invention. In the following description of FIG. 8 as well, the same reference numerals are given to the portions common to FIG.

  That is, in FIG. 8, a resonance circuit 21 having a predetermined resonance frequency f0 including a coil 21a and a capacitor 21b is arranged on the pen tip side. On the eraser side, a resonance circuit 22 having a predetermined resonance frequency f0, which is composed of a coil 22a and a capacitor 22b, is disposed. Further, the microprocessor denoted by reference numeral 40 includes a ROM (Read Only Memory) and a RAM (Random Access Memory) not shown, and operates according to a predetermined program set in advance.

  Further, the oscillator 24 having the frequency f0 is connected to the microprocessor 40, and a drive clock signal for the microprocessor 40 is generated and a signal having a frequency f0 radiated from the resonance circuits 21 and 22 is generated. As a result, the signal of the frequency f0 is output from the terminals P0 and P6 of the microprocessor 23 at a predetermined timing, and the output signals from these terminals P0 and P6 are respectively connected to the pen tip side via the capacitors 28 and 29. It is supplied to the resonance circuit 21 or the resonance circuit 22 on the eraser side.

  Furthermore, capacitors 41 and 42 are provided in parallel with the capacitors 28 and 29, respectively, and analog switches 43 and 44 are provided in series with these capacitors 41 and 42, respectively. These analog switches 43 and 44 are controlled by signals from terminals P 1 and P 7 of the microprocessor 40. The analog switches 43 and 44 are turned on when signals from the terminals P1 and P7 of the microprocessor 40 are at a high level, respectively.

  On the other hand, the microprocessor 40 is connected to a writing pressure detection unit 26 that detects writing pressure when operating on the pen tip side and a writing pressure detection unit 27 that detects writing pressure when operating on the eraser side. These writing pressure detection units 26 and 27 output the detected writing pressure as, for example, an 8-bit digital value, and the microprocessor 40 operates to read these values periodically. The microprocessor 40 outputs signals for controlling the analog switches 43 and 44 to the terminals P1 and P6 based on the read signal.

  As a result, when the signal from the terminal P1 of the microprocessor 40 is at a low level, the analog switches 43 and 44 enhance the signal supplied to the pen tip side resonance circuit 21 in parallel with the capacitors 28 and 41, and the terminal P7. When the signal from is low level, the capacitors 29 and 42 are arranged in parallel, and the signal supplied to the resonance circuit 22 on the eraser side is enhanced. In the circuit of FIG. 8 as well, power is supplied by a battery (not shown) and each unit operates.

  The operation of the fourth embodiment configured as described above will be described below. A signal with a frequency f 0 is output from the terminal P 0 of the microprocessor 40 at the same timing as A in FIG. 4 and supplied to the resonance circuit 21 via the capacitor 28. Similarly, a signal having a frequency f 0 is output from the terminal P 6 of the microprocessor 40 at the same timing as B in FIG. 4 and supplied to the resonance circuit 22 via the capacitor 29. Signals from these terminals P0 and P6 are output simultaneously, and a signal of frequency f0 is always supplied to the resonance circuits 21 and 22.

  In this embodiment, the detection result by the writing pressure detection unit 26 is transmitted from the terminal P0, and the detection result by the writing pressure detection unit 27 is transmitted from the terminal P6. For this reason, in this embodiment, signals are transmitted from both the pen tip side and the eraser side, but in the tablet, the signal on the approaching side is strongly detected.

  Furthermore, in this embodiment, a capacitor 41 is connected in parallel with the capacitor 28 via an analog switch 43. A capacitor 42 is connected in parallel with the capacitor 29 via an analog switch 44. Further, the microprocessor 40 periodically outputs output values from the writing pressure detection unit 26 that detects writing pressure when operating on the pen tip side and the writing pressure detection unit 27 that detects writing pressure when operating on the eraser side. I am reading.

  Therefore, when the pen pressure on the pen tip side (output value from the pen pressure detection unit 26) is equal to or higher than a predetermined value, the microprocessor 40 sets the terminal P1 to the high level to turn on the analog switch 43. As a result, the coupling capacitance when the signal output from the terminal P0 is supplied to the resonance circuit 21 is increased, so that the power of the signal transmitted from the resonance circuit 21 is increased.

  When the eraser side writing pressure (output value from the writing pressure detection unit 27) is equal to or higher than a predetermined value, the microprocessor 40 sets the terminal P7 to the high level to turn on the analog switch 44. As a result, the coupling capacitance when the signal output from the terminal P6 is supplied to the resonance circuit 22 increases, so that the power of the signal transmitted from the resonance circuit 22 increases.

  Therefore, in this embodiment, the signal can be stably detected on the tablet side by increasing the transmission power on the operating side by the operation as described above. In addition, since the power on the unused side can be minimized, the power consumption is reduced and the life of the battery can be extended. When the writing pressure on one side is equal to or higher than a predetermined value, the transmission on the other side may be completely stopped.

  Further, in this embodiment, when one of the transmissions is completely stopped, when the operation is quickly switched from the pen to the eraser or from the eraser to the pen, the tablet immediately after the switching is not detected, There may be a delay in recognition. However, it is possible to cope with quick switching by always performing weak transmission as in the present embodiment, and to recognize immediately. At this time, the stability of the detected coordinates is reduced for the first short time, but the stability is improved by shifting to the normal power.

  FIG. 9 is a block diagram showing a configuration of an embodiment of a position detection apparatus and a computer to which the present invention is applied.

  In FIG. 9, for example, a sensor coil group 1 composed of a plurality of loop coils is provided. The sensor coil group 1 is configured so that the long sides of loop coils (abbreviated by line segments) that perform electromagnetic induction intersect each other as shown in the figure so as to detect in the X-axis direction and in the Y-axis direction. Provided. Note that the solid line (X axis) and broken line (Y axis) loop coils in the drawing are provided in different layers. Therefore, the position indicating pen 39 having the pen tip 30 and the eraser 31 described above is used close to such a sensor coil group 1.

  Further, the plurality of loop coils constituting the sensor coil group 1 are sequentially and repeatedly provided so that the coil wiring has a predetermined pitch. Further, each end portion is connected to the selection circuit 4X or the selection circuit 4Y for each layer, and the loop coils are sequentially selected to be scanned and driven. The selection by the selection circuit 4X or 4Y is performed according to a control signal from the control circuit 5. Therefore, in the control circuit 5, the position of the selected loop coil in the sensor coil group 1 is always grasped.

  The signal received by the loop coil selected by the selection circuit 4X or 4Y is supplied to the band-pass filter 52 that passes the specific frequency f0 through the common amplifier 51, and the signal that has passed is detected by the detector. 53. Further, the signal detected by the detector 53 is supplied to the analog-digital converter 55 through the sample hold circuit 54, and the digitally converted signal is input to the control circuit 5. As a result, the control circuit 5 grasps the magnitude of the received signal and the position of the received loop coil.

  Therefore, according to the configuration of FIG. 9, it is possible to form a position detection device by detecting the approached position of the position pointing pen 39 in the control circuit 5. Further, by using the control circuit 5 as a central processing unit that performs processing based on an arbitrary program, the computer can be formed as a computer that performs processing according to the position where the position pointing pen 39 is approached. In this case, by controlling so that only one of the resonance circuits built in the position pointing pen 39 operates, power consumption can be reduced and the life of the built-in battery can be extended.

  Thus, according to the position indicator of the present invention, the position indicator has a built-in power supply means and transmits a signal for instructing at least the position toward the position detection tablet, and has signal transmission units at a plurality of locations. In addition, by providing a control unit that controls each of the plurality of signal transmission units to an on state or an off state, power consumption can be reduced and the life of the built-in battery can be extended.

  Further, according to the position indicator of the present invention, the position indicator has a built-in power supply means and transmits a signal for instructing at least the position toward the position detection tablet, and the signal transmitter is provided at a plurality of locations. And providing a power control means for controlling the transmission power in at least two stages for each of the plurality of signal transmission units, thereby reducing power consumption and extending the life of the built-in battery.

  Furthermore, according to the position detection device of the present invention, the power supply means is built in, and a signal for instructing at least the position is transmitted toward the position detection tablet. A position detection device having a position indicator provided with a power control means for controlling the transmission power of each transmission unit, wherein the position detection tablet is provided with a determination means for determining each of a plurality of signal transmission units, By outputting the information based on the indication of the indicator and the information based on the discrimination of the discrimination means, the power consumption in the position indicator can be reduced and the life of the built-in battery can be extended.

  Furthermore, according to the computer of the present invention, the power supply means is incorporated, and at least a signal for indicating the position is transmitted toward the position detection tablet, and the signal transmission unit is provided at a plurality of locations, and the plurality of signal transmission units A computer using a position indicator provided with a power control means for controlling the transmission power of each of the plurality of signal transmitters, having a judging means for discriminating each of a plurality of signal transmitting sections, and information based on an instruction from the position indicator and a judging means By executing the process according to the information based on the determination, the power consumption in the position indicator can be reduced and the life of the built-in battery can be extended.

  Note that the present invention is not limited to the above-described embodiment, and the functions of the position indicator that are two types of nib (information entry) and eraser (information deletion) are, for example, entry in different colors. In addition, it is possible to correspond to entry with different handwriting thicknesses, and more than two types of functions can be provided. Furthermore, the present invention can be variously modified without departing from the scope of the claims.

It is a block diagram which shows the structure of 1st Embodiment of the position indicator to which this invention is applied. It is a block diagram which shows the structure of 2nd Embodiment of the position indicator to which this invention is applied. It is a block diagram for the description. It is a wave form diagram for the explanation. It is a block diagram which shows the structure of 3rd Embodiment of the position indicator to which this invention is applied. It is a wave form diagram for explanation of the operation. It is a block diagram for the description. It is a block diagram which shows the structure of 5th Embodiment of the position indicator to which this invention is applied. It is a block diagram which shows the structure of embodiment of the position detection apparatus and computer to which this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11, 13 ... Position indication coil, 12, 14 ... Oscillation circuit, 15 ... Timing circuit, 16 ... Inverter, 21a, 22a ... Coil, 21b, 22b ... Capacitor, 21, 22 ... Resonance circuit, 23 ... Microprocessor, 24 ... Oscillator, 25 ... analog switch, 26,27 ... pen pressure detector, 28,29 ... coupling capacitor

Claims (14)

A position indicator that has a built-in power supply means and transmits a signal for indicating at least the position toward the position detection tablet,
It has signal transmitters at multiple locations,
Control means for controlling each of the plurality of signal transmission units to be in an on state or an off state is provided. 2. The position indicator according to claim 1, wherein the plurality of signal transmission units are provided at least at both ends and transmit pen tip and eraser signals. The position indicator according to claim 1, wherein the control unit sequentially operates the plurality of signal transmission units. Providing a direction detecting means for detecting a direction directed to the position detection tablet;
2. The position indicator according to claim 1, wherein the control unit turns on a signal transmission unit directed to the position detection tablet based on a detection result of the direction detection unit. 3. The direction detection means is a writing pressure detection means,
5. The position indicator according to claim 4, wherein the control unit turns on a signal transmission unit on the side where a load greater than or equal to a predetermined amount is detected based on a detection result of the writing pressure detection unit. 6. The control unit performs control to sequentially operate the plurality of signal transmission units when a load exceeding a predetermined value is not detected from any of the detection results of the writing pressure detection unit. Position indicator. The direction detection means is touch sensor means,
5. The position indicator according to claim 4, wherein the control means turns on the signal transmission unit on the side where the touch is detected based on the detection result of the touch sensor means. A position indicator that has a built-in power supply means and transmits a signal for indicating at least the position toward the position detection tablet,
It has signal transmitters at multiple locations,
Each of the plurality of signal transmission units is provided with power control means for controlling transmission power in at least two stages. The position indicator according to claim 8, wherein the plurality of signal transmission units are provided at least at both ends to transmit pen tip and eraser signals. Providing a direction detecting means for detecting a direction directed to the position detection tablet;
The power control means, based on the detection result of the direction detection means, the transmission power from the signal transmitter on the side directed to the position detection tablet is higher than the transmission power from the signal transmitter on the other side The position indicator according to claim 8, wherein the position indicator is strengthened. Built-in power supply means transmits a signal for instructing at least the position toward the position detection tablet, and has signal transmission units at a plurality of locations, and controls the transmission power of each of the plurality of signal transmission units. A position detection device provided with a position indicator provided with power control means,
The position detection tablet is provided with determination means for determining signals from the plurality of signal transmission units,
A position detection device that outputs information based on an instruction from the position indicator and information based on determination by the determination means. The position detection device according to claim 11, wherein the determination unit is provided at least at both ends of the position indicator and determines signals of a pen tip and an eraser. Built-in power supply means transmits a signal for instructing at least the position toward the position detection tablet, and has signal transmission units at a plurality of locations, and controls the transmission power of each of the plurality of signal transmission units. A computer using a position indicator provided with power control means,
Determining means for respectively determining signals from the plurality of signal transmission units;
A computer that executes processing according to information based on an instruction from the position indicator and information based on determination by the determination unit. The computer according to claim 13, wherein the determination unit is provided at least at both ends of the position indicator and determines signals of a pen tip and an eraser.

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