JPS6082987A - Coordinate indicating method, coordinate indicating device and receiving device - Google Patents

Abstract

PURPOSE:To execute an input to the most faithful form to the human sense, to indicate a coordinate of a digital display, and to reduce an occupied area of a device by deriving a coordinate on a plane basing on an arrival time of an ultrasonic wave to a fixed point from an ultrasonic wave generating source. CONSTITUTION:An ultrasonic generator R which becomes a ring-like coordinate position is fitted to a fingertip, an oscillator 1 is installed to its wrist, and the ultrasonic generator R and the oscillator 1 are connected by a wire 3. A receiving device 6 is placed so as to be overlapped onto the (x) axis of the (x) (y) plane and in the positive direction, has a bar-shaped base member 7 of a trapezoidal cross section, provided with the first, the second and the third ultrasonic detectors (receivers) SO, S1 and S2 at a suitable interval in its longitudinal direction, and also has a microprocessor for controlling together their reception controlling circuit and a counter. In this way, the receiving device 6 receives an ultrasonic wave from the ultrasonic generator R by the receivers SO, S1 and S2, derives (X) (Y) coordinates of the ultrasonic generating source R by operating basing on an arrival time difference, and transmits them to a main processor by cable or radio.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for digitally indicating the coordinates of an arbitrary point, and a coordinate indicating device and a receiving device used directly in this method, and particularly relates to a method for digitally indicating the coordinates of an arbitrary point on a plane. The present invention relates to a method for indicating coordinates, a coordinate indicating device, and a receiving device. .

Conventionally, a tablet type device is known as a device for inputting characters and figures consisting of points on a plane. This device digitally detects and outputs the XY coordinates of a point by touching the entire tip of the indicator pen to any point on the tablet, which is a flat input surface with coordinates determined over the entire surface. It is used for computer online handwritten character recognition, X-Y70 ivy, and graphic display input for characters and graphics. However, this tablet type character/figure input device is made of stone and iron.
The feeling of writing letters and drawing figures is difficult for the operator, and there is an awkwardness in the feeling of using the pointing pen.

In addition, in the tablet type character/figure input device,
A method is also known in which an instruction box called a mouse, which incorporates a running ball, is used instead of an instruction pen. However, this tablet-type character/graphic input device also gives all operators the feeling of rolling a ball on a board, and as with the pointing pen, there is an awkward feeling in using the pointing box.

Reed, the above two examples of tablet type character/graphic input devices are
Both methods have the disadvantage that they can only provide coordinate information of the point where the pointing pen or pointing box touches the tablet, that is, the point on the plane.

A specific object of the present invention is to provide a complete method of specifying coordinates for inputting the coordinates of an arbitrary point on a plane in a form most faithful to human senses and digitally displaying the coordinates.

Another object of the specific invention is to provide a coordinate indicating method in which the receiving device does not occupy a large space on the desk.

A specific invention for achieving the object of CTT et al. places an ultrasonic generator at any point on a plane, and places the ultrasonic generator at a fixed point on each of two hyperbolas existing on the plane, A feature is that the coordinates of the position of the ultrasonic generator are determined as the intersection of the two hyperbolas, based on the time difference between the ultrasonic waves reaching the respective ultrasonic detectors from the ultrasonic generator.

A second object of the invention is to provide a coordinate indicating device that is directly used in the method according to the specific invention.

A second invention for achieving all of these objects includes an ultrasonic generator that is driven by an oscillator to generate ultrasonic waves and is placed at any point on a plane, and two bifi II wires that are located on the plane. A receiving device having a surface shape that covers all fixed points,
The present invention is characterized by comprising a base member, and a receiving device incorporating ultrasonic detectors at all foot points of the two hyperbolas in the base member.

A third object of the invention is to provide a receiving device M'<< that is directly used in the method according to the specific invention. A third invention to achieve this objective is a plurality of ultrasonic detectors that detect all ultrasonic waves from an ultrasonic generator and output all detection signals, and each ultrasonic detector based on these detection signals. In addition to outputting all the corresponding gate signals, there is also a reception control circuit that outputs all 9 interrupt signals upon detecting all ultrasonic waves, and these gates (when the i4-signal is on, the pulse signal from the clock is It is characterized by being equipped with a plurality of counters for counting, and a micro processor that reads the count value of each counter using an interrupt signal and performs 65 nk processing to obtain the coordinates of the MVL generator.

Hereinafter, preferred embodiments of the present invention will be explained in detail based on FIGS. 1 to 10. In order to do this, the principle of the coordinate indicating device will be explained based on FIGS. 1 to 4. At xy 1,000 lJ in Figure 1, r(X, y
) as the sound source, S o (-Ding, o) and St (''-, O)
If C is the difference in the propagation distance of the sound waves calculated from the clock readings in the receivers SO and 81, then
The sound source r(d, lies on the curve base of the following equation.

x=o (C=O) ・・・・・・(2) At this time, 2
The locus of a point with a constant difference in distance from the fixed point So, 81 becomes a hyperbola.

Next, in the xy plane Wj of Fig. 2, let r(X+y) be the sound source, and SO(x Op On , 81(xl, O)
and S2 (x 2 t O) are receivers, respectively,
Ct=llS18211 and e2=llsO8211 between receivers S1 and 82 and between receivers SO and 52, respectively.
XL + X2 net sound wave distance difference, a12 ''' + a0
2-'' and C1〆0 (plate=1.2), the sound source r is one of the solutions of the following two simultaneous equations. however,
As a solution, one that exists in the first quadrant of the xy plain simple is adopted. Furthermore, the actual coordinates of the sound source r are determined by the receiver S of the sound wave signal
o Considering the time of arrival at S, S, and S2, identify all of the solutions.

Each equation (3) (4) Although the sound source r(X, y) is changed,
In this case, consider all of the following:

FIG. 3 is a hyperbolic diagram of the above equation (1). When determining the sound source rf using only the distance difference C for each fixed point A and B, each curve Ql,
There are two points r r r b on Q2, and one must be decided.

This determination is as follows: ■If distance raA is longer than distance rbB, fixed point B
If there is a sound source on the track mQ1 that can be requested using the upper receiver as a mask, and the distance 7 blocks below is longer than the distance raA, then the fixed point A
A sound source that can be claimed using the upper receiver as a mask exists on the curve Q2, as shown below.

FIG. 4 shows two hyperbolas and the position of the sound source at the intersection of these two hyperbolas.

In this case, there are two intersection points Kl, 2 in the first quadrant. Then, as in FIG. 3, each receiver s.

- Decide which of S2 will become a mask. Receiver S
If 1 is a mask, the solution is to set the intersection Kl on the curve Q3, and if the receiver S2 is a mask, the solution is to set 2 to the intersection on the curve Q4.

As shown in FIG. 5, a ring-shaped ultrasonic generator R is inserted into the tip of the index finger of the right hand, and an oscillator 1 is attached to the wrist of the right hand. This oscillator 1 may be worn on a finger, hand, arm, or the like. As shown in FIG. 6, the excavator 1 has 40 kHz oscillation elements 2a, 1
It consists of a 0011z oscillation resistor 2b, a pulse counter gate 4, a driver 5, and a small battery (not shown). The ultrasonic generator box and the oscillator 51 are connected by a wire 3.

40 kJJz oscillation element 2a in the excavator 1 and 1°0
In combination with the 11z oscillation element 2b, the ultrasonic generator generates two pulses of 40 kHz ultrasonic waves every 10 msec.

The ultrasonic generator R and the oscillator 1 may be integrated into a pen shape. In this case, use an ultrasonic generator R at the pen tip.
is provided, and an oscillator 1 is built into the pen shaft.

The receiving devices 6 are arranged on the X axis of the xy plane so as to overlap in the positive direction. The receiving device 6 has a bar-shaped base member 7 with a trapezoidal cross section, and first and second base members arranged at an appropriate interval in the longitudinal direction of the base member 7, which detect all 40 kHz ultrasonic waves. and a third ultrasonic detector (
Receiver) has all So, St, and S2. A reception control circuit 9 (see FIG. 8) that controls the signals obtained from these first, second, and third ultrasonic detectors So, Sl, and S2, and a counter circuit 10 (see FIG. 8). , these receiving control circuit 9, counter circuit 10, and a microprocessor 11 (see FIG. 8) that performs total integrated control are integrated into the receiving device 6.
It is included in 1.

The receiving device 6 transmits the xy coordinates of the ultrasonic generator R to the main processor t12. This transmission may be done by cable or wirelessly.

The first ultrasonic detector SO is located at the origin. 1st, 2nd and 3rd ultrasonic detector S O, S 1 and S2
The mutual spacing is arbitrary. However, it is appropriate to set it to about 15.

The first, second and third ultra-high wave detectors So, S1 and S2 have the same configuration, and the circuit thereof is shown in FIG. Therefore, the first ultrasonic detector SO will be explained. This first super wave detector SO includes a sound collecting element 13, a shaping circuit 14 following this sound collecting element 13,
A first D-type lip flop 1 following this shaping circuit 14
It consists of 5.

As the shaping circuit 14, for example, a Schmitt trigger circuit is employed. The output Q of the first D flip-flop 15 is supplied to the reception control circuit 90 input terminal TO as a detection signal SGO. Therefore, the second and third ultrasonic wave detectors S1
and Sz (t4 signals SG+ and SG2 are supplied to respective input terminals TI and T2 of the reception control circuit 9.

The reception control circuit 9, as shown in FIG.
First, second and third ultrasonic detectors So.

Sl and Sz valley detection signals 8Go, SGi and SG2
a second D flip-flop 17 to which the output of the OR circuit 16 is supplied to the clock input terminal; and the 5th D7 lip flops 18, 19 and 20, as well as the OR circuit 16, the i-th, second and third ultrasonic detectors So, Sl and S.
z's respective detections (IA SGO, SGI and S02
a NAND circuit 21 into which is input, a first, second and third
The detection signals SGO, SUl and SG2 of the ultrasonic detectors So, 81 and Sz are connected to three knot circuits 22a.
~22c are all supplied as one inverting input through the first, second and third N01 (circuits 23, 24 and 25
As the other inverted input of , start (, j No. S T
AR, T are supplied. This start signal 5TAR
.
7 are also provided as 7 inputs.

The first, second and third NO circuits 23, 24 and 2
The output of 5 is fed to the reset input terminals of the 3rd, 4th and i 51) flyknob frogs 18, 19 and 20.

The above relationship 1b1] f, l11 circuit 9 each 1] flip 7
Nine outputs are output to each gate circuit 32, 33, and 34. Each gate circuit 32, 33.34 connects the -power to a clock 29 that outputs clock pulses with a frequency of 5 to 10 MHz, and connects the other power to each counter 26, 27, 28.
is connected to. When the gate circuit is turned on by the gate information, the clock pulse from the clock 29 is output to all counters, and the p counter starts counting. When the gate circuit is turned off by the -i gate signal, the counter Since no clock pulse is input to the counter, the counter does not count.

The reset signal R of the reception control circuit 9 is generated by outputting the start signal S '1' ART output from the microprocessor 11 to each counter 26, 27, 28 as a reset signal R.

Clear 28.

When the three No. 46 signals SGO, SGI, and SGZ from the ultrasonic detectors So, Sl, and Sz are input to the reception control circuit 9, the NAND circuit 21 outputs an interrupt signal INT-i to the microprocessor 11. microprocessor 1
1 outputs an address signal to the decoder 31 and also outputs it to the control signal tone multiplexer 30 in response to the interrupt signal INT. The decoder 31 is connected to each of the counters 26, 27 and 28, and outputs the count value stored in the p counter to the multiplexer 30 through the entire bus 35 in response to the im signal from the decoder 31. 16-bit data from the counter is output to the microprocessor 11 as 8-bit data.If the microprocessor 11 can input all 16-bit data, then 1. 30 is uneasy.The microprocessor 11 registers the valley counter 26.
, 27. When all data is input from 28, one of the data is KL 011, so use this as a mask,
The other two are treated as slaves as data delayed in proportion to the total distance.

Then, based on this mask and slave data, calculate the syllables calculated by equations (3) and (4) above, and calculate the ultrasonic generator 1 (・(/JXy coordinates.
No. 5TART is output to the reception control circuit 9.

FIG. 10 shows a timing chart of the receiving device 6.

In the figure, Lee, Ha, and Ho are connected to each ultrasonic detector S2. S
0 and 81 detection signals "SG2.5 (jO.

It is SGI. Gate signals Ez, Eo, and Ex outputted from the reception control circuit 9 are sent to the ports 2 and 2.

NT is the interrupt signal output from the control circuit 9.
, te is the data input time of the microprocessor 11, ri is the calculation time of the microprocessor 11, or the start signal STA output from the microprocessor 11
RT f is shown respectively.

The operation of the coordinate indicating device according to this embodiment will be explained in detail below. Among the first, second and third ultrasonic detectors 80, 81 and S2, for example, the third ultrasonic detector S2 detects the first rise of the ultrasonic wave from the ultrasonic generator R. When detected as the first rising edge p of the square pulse signal converted as a signal, the first rising edge of the square pulse I, J+3', is
OR circuit] 6, NAND circuit 21 and third NOR [
] is supplied to the OR circuit 16 and the third No. circuit 25.
5 and 2nd D Frisogefrog 17 are all active. In addition to this, 3rd and Q4. l) Frisopnolog 18
and 19 become active, and at the same time, the fifth D fling 20 remains inactive. This is all of Figure 10.
Detection of ultrasonic detector S2 at time tQ '+=
By the rising 9 of 3-8Cx 2, the 10th N:・-
As shown in FIG.
Gate signals EO and El of 19 and 19 fall simultaneously.

On the other hand, the gate signal E2 of the 5D control flop 2° is maintained at a high level 1f as shown in FIG.
It is.

As each gate signal Eo, gt falls, each gate circuit 32, 33 turns "on" and outputs a clock pulse from the clock 29 to each counter 26, 27.

Then, each counter 26, 27 starts counting. On the other hand, since the gate signal level 2 is the It H1 level, the gate circuit 34 is in the "off" state and the counter 28
is 11 of 'O゛ without counting.

Next to the third ultrasonic detector S2, the first ultrasonic detector SO detects the first rise of the ultrasonic wave from the ultrasonic detector box in the same manner as in the case of the third ultrasonic detector S2, Detection signal SG
It is output to the reception control circuit 9 as I. This detection signal is
0 circuit 16, NAND circuit 21 and NOT circuit 22a
' - is supplied to the first NOR circuit 23 through the NOR circuit 23 and remains active continuously. In addition to the OR circuit 16 and the second D flip-flop 17, the first NOR circuit 23 is all activated.

As a result, the third D7 lip 70 knob 18 is newly rendered inactive. Therefore, as shown at time t1 in FIG. 10, the signal EO of the 3D flip-flop 8 rises.

When the gate signal Eo rises, the gate circuit 32 turns off and the first counter 26 stops counting.

Finally, when the second ultrasonic detector S1 detects the first rise of the ultrasonic wave from the ultrasonic generator, the second NOR circuit 2
4 and the NAND circuit 21 are newly activated. Accordingly, the 3rd, 4th and 5th D control frogs 18.19
and 20 are inactive.As shown at time t2 in FIG. At the same time, the entire count is stopped, and the interrupt signal INT from the NAND circuit 21 falls as shown in FIG. calculates syllables from 13 to t4 based on the first data as shown in Figure 10, and outputs the xy coordinates f, n of the ultrasonic generator. C, Figure 1 O・N・Time t5
The start signal STA T is output to the receiving 1J control cape circuit 9 as shown in FIG. This p, valley frigflop 15
~20, each counter 26-2B is reset.

(-L”r, as shown in the 10th section time t□, each detection signal SGo to SG2, gate signal EO to E1, and interrupt signal I
NT returns to the initial state and starts the next ultrasonic generator R.
wait for a signal from

As described above, the present invention calculates the coordinates of the ultrasonic source on a plane based on the arrival time of the ultrasonic wave from the ultrasonic source to a fixed point. Unlike the case of , there is no awkward feeling in using the ultrasonic generator and oscillator.

1. In order to input the position 117 information of the ultrasonic generator,
Three-dimensional coordinates can also be indicated, although there are some limitations since this ultrasound generator does not need to be in contact with a flat surface.

In addition, since the ultrasonic generation source is located at the intersection of two hyperbolic doors, the ultrasonic receiving device only needs to have a planar shape that can cover the fixed point of the hyperbola. The total area required can be made extremely small.

However, as is clear from the groove bottom of the second invention, there is no restriction on the installation location of the oscillator.

[Brief explanation of the drawing]

FIG. 1 is a graph explaining the principle underlying the coordinate indicating device according to the present invention, FIGS. 2 to 4 are graphs explaining the principle of the coordinate indicating device according to the embodiment, and FIG. ,
A system diagram of the coordinate indicating device, FIG. 6 is a coupling circuit diagram of the ultrasonic generator and oscillator of the coordinate indicating device, FIG. 7 is a circuit diagram of the ultrasonic detector, and FIG. 8 is a reception control circuit. ,
FIG. 9 is a combined block diagram of the counter circuit and microprocessor, FIG. 9 is a detailed circuit diagram of the reception control circuit 9, and FIG. 10 is a time chart for explaining the present invention. 1 also... Ultrasonic generator, l... Oscillator, 6... Receiving device, 7... Base section side, 9... Reception controller circuit,
1o... Counter circuit, 11... Microprocessor, 26... First counter, 27... Second counter, 28... Third counter, 29... Clock, SO
...first ultrasonic detector, Sl...second ultrasonic detector, S2...third ultrasonic detector. Figure 1 @ Figure 2 Figure 3 / Figure 4 Figure 5

Claims (8)

[Claims] (1) Place an ultrasonic detector at any point on the plane, and place an ultrasonic detector (i-) at each fixed point of the two hyperbolas existing on the plane, and place the A seated image indicating device that determines the coordinates of the position of the ultrasonic generator as the intersection of the two hyperbolas based on the time difference between the ultrasonic waves reaching the ultrasonic detector. (2) It has an ultrasonic generator that is driven by an oscillator to generate ultrasonic waves and is placed at any point on a plane, and a planar shape that covers all fixed points of two hyperbolas existing on the plane. On the base side of the receiving device and this base member,
A coordinate indicating device comprising a receiving device incorporating ultrasonic detectors at all fixed points of the two hyperbolas. (3) The coordinate indicating device according to claim (2), characterized in that the fixed points of the two hyperbolas are replaced by three fixed points. (4) The coordinate indicating device according to claim (2), wherein the ultrasonic generator is a ring that is inserted into a fingertip. (5) The coordinate indicating device according to claim (2), in which the oscillator has a built-in battery and is worn on a part of the human body. (6) The coordinate indicating device according to claim (2), wherein the base member is bar-shaped. (7) Claim No. 2 in which the ultrasonic generator is provided at the tip of the indicating pen, and the oscillator is provided at the shaft of the indicating pen.
) Coordinate indicating device described in paragraph 1. (8) A plurality of ultrasonic detectors that detect ultrasonic waves from an ultrasonic generator and output all detection signals, and output gate signals corresponding to each ultrasonic detector based on these detection signals, and A reception control circuit that outputs all interrupt signals upon detecting an ultrasonic wave, a plurality of counters that count pulses from the clock when the gate (E) is on, and a reception control circuit that outputs all interrupt signals when the 7. A receiving device characterized by a microprocessor that calculates the coordinates of an ultrasonic generator by reading all of the count values.