JPH0132131Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a handwriting input device that detects input position coordinates by sequentially sampling and scanning a plurality of electrodes spaced apart and facing each other orthogonally. Regarding.

[Conventional technology]

Pressure-sensitive handwriting input devices are used as terminal devices for computers and game machines. This type of handwriting input device is 2
A large number of parallel electrodes are formed on one sheet, and both sheets are arranged facing each other so that the parallel electrodes of each sheet intersect at right angles to form a matrix structure, and a pulse signal is sampled and scanned to one electrode. There is. Then, when the sheet is pressed, the electrodes of both sheets come into contact at the pressed portion, and a scanning pulse signal is output from the electrode to which the scanning pulse signal is applied to the other electrode as a detection pulse signal. The input position coordinates are detected by determining the timing of this detection pulse signal.

[Problems with conventional technology]

This pressure-sensitive type inputs data when it is pressed, but when inputting handwriting, the hand itself is often used to press the sheet in addition to the pen tip, so this part of the handwriting can also be mistaken. There was a problem that the data was entered incorrectly.

[Purpose of invention]

Therefore, the present invention provides a handwriting input device that can process input only for pressed areas of a certain size or less, such as those pressed by a pen tip, etc., while excluding large pressed areas such as the hand grip. It is intended to.

[Key points of the idea]

In order to achieve this purpose, the handwriting input device of the present invention determines the size of the pressed part, and if the size is less than a certain value, the key input process is performed as the pressed part to be input. The main point is that if there is a manual input, it is excluded from the key input.

[Configuration of Example]

Reference numeral 1 in FIG. 1 is a control section, and the control section 1 sends an addition command signal d to the sampling counter 2;
A subtraction command signal e and a reset signal f are given.
The sampling counter 2 performs addition or subtraction counting in accordance with the clock signal φ while the signal d or the signal e is applied at a high level. This count data is decoded into scanning pulse signals A ₁ to A _o by the decoder 3 and applied to each input electrode of the handwriting input section 4 .

The handwriting input unit 4 has a large number of parallel electrodes formed on two sheets, and the sheets are arranged facing each other with a spacer interposed between them so that the parallel electrodes of each sheet are orthogonal to each other to form a matrix structure. It is. The electrodes on one sheet of this handwriting input section 1 are configured as the input electrodes, and the electrodes on the other sheet are configured as output electrodes.

When the handwriting input section 4 is pressed, the input electrodes and output electrodes of both sheets come into contact, and the scanning pulse signal A ₁ ~
A _o is output from the input electrode to the output electrode. The outputs of the output electrodes are given to the encoder 5 as detection pulse signals B ₁ to _{B o} and encoded into detection data. This detection data is set in the buffer 6 by the read command signal g given from the control section 1, and the count data from the above-mentioned sampling counter 2 is also set in the buffer 6 by the read command signal g. These detection data and count data are given to the control section 1, and the input coordinate position of the pressed portion is determined.

In addition, the encoder 5 outputs the above detection pulse signal.
An input presence detection signal h, which is the logical sum of B ₁ to B _o , is output to the control section 1 . This input presence detection signal h is a signal that is output when any point of the handwriting input section 4 is pressed and any of the detection pulse signals B ₁ to _{B o} becomes high level. Based on the presence detection signal h, the control unit 1 detects that a press input has been performed.

This input presence detection signal h is also given to the counter 7 as a drive signal, and the counter 7 receives this input detection signal h.
While the clock signal φ is being given as a high level, the clock signal φ is counted, and when the count value becomes "4" or more, a clear signal i is given to the control section 1.
It is reset by a reset signal j from .
The above-mentioned carry signal i is a signal indicating that the pressed portion of the handwriting input section 4 is large enough to cover five or more input electrodes. Therefore, if the control section 1 is given the above-mentioned carry signal i, it will determine that the pressed part is the hand-held part and exclude it from key input.

Further, an input determination signal c is outputted from the control section 1 to the decoder 3, and this signal c causes the decoder 3 to simultaneously input all the input electrodes of the handwriting input section 4.
When a high level signal is given, the encoder 5
The presence or absence of a press input is detected based on the presence or absence of an input presence signal h from.

[Operation of the embodiment]

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3.

When the power is turned on, the control section 1 starts the flow process shown in FIG. 2, and first, the control section 1 continues to output the input determination signal c until the input presence detection signal h is obtained (steps S ₁ and S ₂ ). This signal c causes the decoder 3
From then on, all input electrodes of the handwriting input section 4 are connected to T ₁ in Figure 3.
At the same time, a high level signal is applied as shown in . Now, on the handwriting input unit 4, there are two pressing parts, the pressing part _P1 of the pen tip and the pressing part _Q1 of the right hand holding the pen, as shown in the shaded area in Fig. 1. Then, the voltage applied to the input electrode is
A high level signal is outputted to the output electrode at the pressed portion and given to the encoder 5, and an input presence detection signal h is given to the control section ₁ as shown in FIG. 3 T2.

As a result, the control unit 1 determines that there is a press input, stops outputting the input determination signal c (step S ₃ ), resets the sampling counter 2 with the reset signal f, and then outputs the addition command signal d.
Output as high level (step _S4 ). As a result, the sampling counter 2 is incremented, and the count data is decoded by the decoder 3 to generate a scanning pulse signal as shown in Fig. ₃ T3.
A ₁ to A _o are sequentially applied to the input electrodes of the handwriting input section 4. Then, when the scanning pulse signal A _n is applied to the input electrode at the left end of the pressing portion P ₁ , a detection pulse signal is outputted from the encoder 5 as shown in Fig. 3.
An input presence detection signal h as shown at T ₄ is given to the control unit 1.

As a result, the control unit 1 determines that the sampling scan has reached the pressed part _P1 (step
S ₅ ), the output of the addition command signal d is stopped, the addition operation of the sampling counter 2 is stopped, and the sampling scan is interrupted, and the read command signal g is stopped.
is output to set the count data and detection data at this point in the buffer 6, and a reset signal j is output.
Outputs and resets counter 7 (step
_S6 ). Next, the control section 1 outputs the addition command signal d at a high level for a time Δt corresponding to four pulses of the clock signal φ, thereby performing sampling scanning for four input electrodes (step S ₇ ).

Since the pressed part _P1 is pressed by a pen or the like, its area is small and occupies only one or two input electrodes, and in the sampling scan during this Δt, the area is already at T5 in Fig. ₃ . Input presence detection signal h is low
It has become a level. Therefore, the counter 7 does not output the carry signal i to the control section 1. If the signal i is not input during sampling during this period of Δt, the control unit 1 determines that the pressed portion _P1 is due to the pressure of the pen tip (step _S8 ), and causes the buffer 6 to perform the above step _S6 . The input position coordinates are determined based on the set count data and detection data, and key input processing is performed (step _S9 ).

Thereafter, the control unit 1 determines the presence or absence of handwritten input in steps _S1 and _S2 , specifies the position coordinates of the pressed part in steps _S3 to _S5 , and determines the size of the pressed part in steps _S6 to _S8 . , the input processing of the pressed position coordinates in step _S9 is repeated, and the moving coordinates of the pressed portion _P1 by the pen tip are inputted in sequence.

In this way, input processing for the pressed portion _Q1 by hand is automatically excluded.

In this way, in this device, the sampling scan is performed from the left side of the handwriting input section 4 through the processing of steps _S1 to _S9 , so when handwriting is input with the right hand, the pen tip pressed part P ₁ is detected, the subsequent sampling scan of the right side portion is omitted, and the position coordinates of the pressed portion are quickly determined.

Next, a case where handwritten input is performed with the left hand will be explained. In this case, as shown in Figure 1, the part where the pen tip is pressed by the left hand is P ₂ and the part where the pen tip is pressed is Q ₂
becomes. In this device, sampling scanning is performed from the left side of the handwriting input section 4 as described above, so at the time when the input presence detection signal h is output in step _S5 of the processing in steps _S1 to _S8 , This means that sampling has been performed up to the left end of the hand-held portion _Q2 . This hand portion _Q2 occupies more than five input electrodes. Therefore, Δt in step _S7
During the sampling scan in between, the input presence detection signal h continues to be output, and at time _T5 in FIG. As a result, the control section 1 determines that the pressed portion _Q2 is a manual press (step _S8 ), and no key input processing is performed for this pressed portion _Q2 .

Next, the control section 1 outputs a reset signal f to the sampling counter 2, sets the content of the sampling counter 2 to "0", and then outputs a subtraction command signal e (step _S10 ). As a result, sampling counter 2 performs subtraction counting,
The count data is decoded by the decoder 3, and scanning pulse signals _Ao to _A1 are sequentially outputted in reverse order as shown in FIG. ₆ T6. However,
The input electrodes of the handwriting input unit 4 are sampled and scanned from the right side, and when the scanning pulse signal A _n is applied to the rightmost input electrode of the pen tip pressing portion P ₂ , the input electrodes of the handwriting input unit ₄ are scanned from the encoder 5 as shown in FIG. The input presence detection signal h is given to the control section 1 (step S ₁₁ ).

As a result, the control unit 1 stops outputting the subtraction command signal e, stops driving the sampling counter 2, interrupts the sampling scan, and
A read command signal g is output to set the count data and detection data in the buffer 6, and a reset signal j is output to reset the counter 7 (step _S12 ). Next, the control section 1 outputs the subtraction command signal e for a time Δt corresponding to the clock signal φ4 to perform sampling scanning for four input electrodes (step _S13 ). In this case, since the pressed part _P2 is the pressed part by the pen tip, it occupies only one or two input electrodes, and the input presence detection signal h is not output in the sampling scan between Δt, so as shown in FIG.
At time _T8 , the counter 7 does not output the carry signal i. As a result, the control unit 1 controls the pressing portion P ₂
It is determined that this is due to the pressing of the pen tip (step _S14 ), the input position coordinates are determined based on the count data and detection data set in the buffer 6 in step _S12 , and key input processing is performed ( Step S ₁₅ ).

Thereafter, the control unit 1 excludes the manual pressing part _Q2 from the input processing in steps _S1 to _S8 , and
Identification of the position coordinates of the pressed part of S ₁₀ to S ₁₁ , steps
Determining the size of the pressed part of S ₁₂ to S ₁₄ , steps
The process of inputting the pressed position coordinates in _S15 is repeated, and the movement coordinates of the pressed part _P2 by the pen tip are sequentially inputted.

In this way, input processing is performed only for the pressed portion _P2 by the pen tip.

If the handwriting input section 4 only has a part pressed by hand, the key input processing target will be the sampling scan from the left side in steps S ₁ to S ₈ , or the sampling scan from the right side in steps S ₁₀ to S ₁₄ . Therefore, input processing of the pressed position coordinates is not performed at all.

Note that the direction of the sampling scan is not limited to being performed from both the left and right sides, but can be performed in one direction over the entire handwriting input surface, and then by determining the time during which the signal h has been output, the pressure part can be scanned. It is also possible to detect the size. According to this method, the number of output electrodes occupied by the pressing portion is determined. Further, the time period Δt for determining the size of the pressed portion may be varied depending on the density of the input electrodes.

[Effect of idea]

As described above, the present invention determines the size of the pressed part, and if the size is less than a certain value, it is processed as a pressed part such as a pen tip, and if the size is more than a certain value, it is treated as a pressed part. It is designed to be excluded from key input, so you can input handwriting even with your hands on it.

[Brief explanation of the drawing]

FIG. 1 is an overall block circuit diagram of one embodiment of the handwriting input device, FIG. 2 is a flowchart of handwriting input processing, and FIG. 3 is a time chart of signals of various parts of the circuit of FIG. 1...Control unit, 2...Sampling counter,
3...Decoder, 4...Handwriting input section, 5...Encoder, 6...Buffer, 7...Counter.

Claims (1)

[Claims for Utility Model Registration] Position coordinate input means consisting of an input electrode group and an output electrode group arranged in a matrix; a scanning means for sequentially applying sampling signals to the input electrode group of the position coordinate input means; a detection means for detecting the sampling signal output from the output electrode group through the pressing part of the coordinate input means; a counting means for counting the continuous output signals of the sampling signal detected by the detection means; and the counting means. 1. A handwriting input device comprising input processing means for processing the sampling signal detected by the detection means as a position coordinate input signal only when the count value by the detection means is less than or equal to a predetermined value.