JPS60134320A - Coordinate reader - Google Patents

Abstract

PURPOSE:To detect quickly a position by stopping temporarily a scan of a scanning line which has detected a peak, and executing continuously a scan of a scanning line which has not detected the peak yet. CONSTITUTION:A coordinate reader is formed by a coordinate operating circuit 1, a scanning signal generator 2 for generating a synchronizing signal (a) and a reference scanning signal (b), X and Y scanning circuits 6, 7 to which X and Y scanning signals (e), (f) are inputted, etc. When an alternating magnetic field generator 11 approaches scanning lines 12, 13, a peak detecting circuit 16 detects a peak of a calling-on signal superposed thereon, and detects a position of a coordinator. In this case, this device is provided with sr latches 17, 18 for stopping a scan of the scanning line concerned until a synchronizing signal is generated thereafter, when the peak has been detected, and AND circuits 19, 20, for controlling a peak detecting signal inputted to said latch to X and Y. In this way, a scan of the scanning line which has detected the peak is stopped until the next synchronizing signal is generated, and a scan of the scanning line which has not detected the peak yet is executed continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies an alternating magnetic field generated from a coordinate indicator to a conducting wire laid on a tablet, detects the magnitude of the induced voltage induced in this conducting wire, and calculates the position of the coordinate indicator. The present invention relates to an automatic coordinate reading device for determining coordinates.

FIG. 1 shows the circuit bottom of a conventional coordinate reading device, and FIG. 2 shows its timing chart.

Conventionally, this type of coordinate reading device includes a coordinate calculation circuit 1, a -coordinate scanning synchronization signal G output from this circuit, and a scanning signal generator that generates a reference scanning signal G in synchronization with this signal. 2, and a flip-flop 3 to J- for alternately dividing this reference scanning signal into X scanning lines and X scanning lines for each scanning.
, and AND circuits 4 and 5, and X and Y scanning signals e and f are input thereto. ! , the Y scanning circuits 6 and 7 and the scanning circuit select the X analog switch 8, the Y switching switch 9, the AC signal source 10, the alternating magnetic field generator 11, the X scanning line 12, and the 13, an analog circuit 14 that detects and amplifies the induced signal, a MU/D converter 15 that exchanges the amplified induced signal into a digital value, and a peak detection circuit 16 that outputs the peak detection signal Jil,H. I'm here. Then, the peak detection circuit 16 moves the alternating magnetic field generator 11 closer to the scanning lines 12 and 13 to
The peak of the induced signal superimposed on the scanning line (X scanning line) is detected, and a peak detection signal 1 (H) is generated. This signal is input to the coordinate calculation circuit 1 and is input to the X scanning circuit 7 (X scanning circuit 6).
Immediately after the peak is detected, the X scanning circuit 7 (X scanning circuit 6) continues scanning in order to mutually scan l:Y9 using the scan address generated by was. However, with this scanning method,
Since unnecessary scanning is performed immediately after a peak is detected, the scanning of the scanning line where the peak is not detected is slow, and the detection of the position of the coordinate indicator is delayed.

The present invention is intended to quickly eliminate the above-mentioned drawbacks in an electromagnetic induction title reading device by bringing a coordinate indicator having an excitation winding that generates an alternating magnetic field closer to the scanning line. The peak of the induced signal that overlaps with the X scanning line (X scanning line) is detected, and the scanning of the scanning line where the peak was detected is stopped when the next synchronization signal is generated, and the scanning line 7 where the peak is not detected is stopped. By continuously performing the scanning, the position of the coordinate indicator can be quickly detected. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coordinate reading device according to the present invention will be described below as a circuit configuration based on the drawings. FIG. 3 shows the circuit configuration of the coordinate reading device according to the present invention, and the parts with the same configuration as the conventional one are
The same reference numerals as those in the figure are used to omit the explanation. 17 is an SR latch for stopping scanning of the X scanning line until a synchronization signal is generated when the peak of the X coordinate is detected, and 18 is an SR latch for stopping the scanning of the The peak detection signal input to the BR latch 19s20ij8R latch 17 and 18 for stopping scanning of the scanning line is
It is an AND circuit that controls the

FIG. 4 shows a timing chart of the circuit of the coordinate reading device according to the present invention, where J is a synchronization signal, X is a reference scanning signal,
L is the selection signal for X scanning, M is the selection signal for Y scanning, % N
teeth! 71: Scan signal 1P is a Y scan signal, R is a Y scan peak detection signal, S is an X scan stop control signal, and Tf'i is a Y scan stop control signal.

Next, the operation will be explained.

By bringing the alternating magnetic field generator 11 close to the scanning lines 12 and 13, the peak of the induced signal superimposed on the X scanning line is detected, a peak detection signal Rtl- is generated, and the AND circuit 1
9 and 20, the logical product of the Y scanning selection signal and g
sR latch 18 is set 3, XY constant scan selection signal is activated,
7 lip flops 3 are preset to J-, which generates M, and fixed to Y scan selection.

Thereafter, X scanning is continuously performed until the coordinate calculation circuit 1 outputs the synchronization signal J for one coordinate scanning.

Furthermore, the circuit configuration shown in FIG. 5 shows a second embodiment according to the present invention, and parts having the same configuration as the conventional one are given the same reference numerals as in FIG. 1, and the explanation is omitted. equipped. This is a coordinate calculation circuit, and software implementing the function of stopping the scanning of the scanning line where the peak has been detected and continuously scanning in the other direction perpendicular to the scanning in the one direction is shown in Fig. 6. Figure (c) shows a flowchart of the X/Y scanning routine, and the program 31 is based on software, software, and a timer, although not shown here. By checking the one-coordinate scanning start flag generated by the synchronization generation routine for each coordinate, it is determined whether or not it is the start of scanning. If the program is 32mm and the scan is started, the x/Y switching flag is set to logic 1.
and set it to perform X/Y alternate scanning. Program 33c performs the logical OR of the X/Y scan flag used in the previous scan and the X/Y switching grab, sets the result f and the X/Y scan flag, and determines the next scan direction.

When the X/Y switching flag is set to logic 1, each time an exclusive OR is performed, logic 1. The logic φ is alternately scanned by JX/Y, and the X/Y switching flag is set to the logic ψ.
The state of the X/Y switching flag changes to X/Y or Y(2) continuous scanning without any change. The program wing checks the scanning direction determined by the program 33, and outputs the next scanning address in the programmer 36.

FIG. 6(b) is a flowchart of the peak detection interrupt routine.
The program 37 checks whether the peak detection signal generated by the peak detection circuit is generated from the X or Y scan by checking the X/Y scan flag, and the program 37 checks the X/Y scan flag. During the process, the program 37 determines that a peak detection signal has occurred, and the next X/Y
When the scan is set to Y scan (, X/'l scan flag is set to logic ψ, the program 39 stores the scanned address as the peak address in the memory. The program 40.41 is the program 37 This is a program for when it is determined that a peak detection signal has occurred during X scanning.Program 4z is for stopping scanning in the direction in which the peak was detected and continuously scanning in the other orthogonal direction. ni, X/
Set the Y switching flag to logic φ. The scanning of the other edges X and Y is performed continuously in the other direction orthogonal to the direction in which the peak was detected until the 1M mark scanning start flag is set in the synchronization generating routine for each return mark.

According to the present invention, as explained in the above embodiments, the scanning of the scanning line where the peak has been detected is opened and stopped when the primary synchronization signal is generated, and the scanning of the scanning line where the peak has been detected is continued. By doing this, you can quickly detect the position of the coordinate indicator.

[Brief explanation of the drawing]

FIG. 1 is a circuit cross-sectional diagram of a conventional coordinate reading device, FIG. 2 is a timing chart of the circuit shown in FIG. 1, FIG. 3 is a circuit cross-sectional diagram of the coordinate reading device of this embodiment, and FIG. FIG. 5 is a diagram showing the timing of the circuit shown in FIG.
6 shows a circuit configuration implemented by software using a -r microprocessor, and FIG. 6 shows a flowchart of the software of this embodiment. 1. IK standard calculation circuit, z-”yll flaw signal generator 30
Base scanning signal f: J- for dividing into X scan line and Y scan line
flip-flop, 60. ! scanning circuit, 7. , Y71: check circuit 80. x analog switch, 9. ,! Analog Nuitschi 11,
, 5e magnetic field generator t2ms" scan line, 13ee" scan line 160. Peak detection circuit 17, SR latch 18 for stopping scanning of the X scanning line when detecting the peak of the X coordinate. SR latch 210 for stopping scanning of the X scanning line when a coordinate peak is detected. Coordinate calculation circuit equipped with a microprocessor.゛ Applicant Seiko Electric Rod Industry Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Claims] Sequentially applying scanning signals to a plurality of xYX scanning lines laid out in parallel on a tablet having an XY scanning circuit and analog switch group, and bringing a coordinate indicator having an excitation winding that generates an alternating magnetic field onto these scanning lines close to each other. Accordingly, in a coordinate reading device that determines the position of a coordinate indicator by detecting a guidance signal superimposed on the scanning signal, a peak detection section connected to the XY analog switch group, and a peak detection section connected to the peak detection section are provided. The device is equipped with an arithmetic circuit that sequentially scans orthogonal scanning lines in one direction for each scanning line, stops scanning for a specific period of time in which a peak is detected by the peak detection section, and then scans the scanning line orthogonal to that scanning line. A coordinate reading device characterized in that scanning in the other direction is performed continuously during a period when scanning of a scanning line in which a peak has been detected is stopped, thereby speeding up position detection of a coordinate indicator.