JP3397519B2 - Coordinate input device and its coordinate input method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device for detecting a coordinate position pressed by a pen or a finger, and a coordinate input method thereof.
It is about law .

[0002]

2. Description of the Related Art As a conventional coordinate input device, for example,
It is known to use a resistive film type (pressure sensitive type), a capacitive coupling type, an electromagnetic induction and electromagnetic transfer type, an ultrasonic wave utilizing type, a stylus pen type, a light blocking type touch panel and the like.

The coordinate input device of the type (3) is constructed by stacking two or more glass plates or resin films (hereinafter referred to as "conductive films") having resistance films, and the two resistance films are formed at a designated position. It makes contact and energizes, and by detecting the potential at the contact point at that time, the resistance value from the reference surface to the contact point is detected, and the contact point is evaluated and converted into position coordinates.

The coordinate input device of the type (1) is composed of one or more glass or resin having a transparent electrode pattern in the form of a line or a loop coil in the x and y directions of the input surface, and is dedicated for the designated use. By processing a signal detected in the form of a pen and an electromagnetic wave, a recent transparent electrode pattern is specified at the designated portion, the designated portion is evaluated, and the coordinate is converted into position coordinates.

In the coordinate input device of the method (3), a plurality of vibration detecting means (sensors) are installed on the tablet which is the input surface, the input vibration is detected by the vibration input means, and the time and propagation required for the propagation are detected. The distance between the sensor and the vibration input means is calculated from the speed, and the input position coordinates are detected.

The coordinate input device of the type (1) detects a CRT scanning signal with a stylus pen contacting the CRT, specifies the position on the raster pattern from the detected scanning timing, and evaluates the position coordinates. .

In the coordinate input device of the method (1), a light beam of infrared rays or the like is stretched around the display surface of the display like a mesh and is blocked by a finger to detect a touch input, and which light receiving unit is detected. The touch input coordinates are specified depending on whether the light blocking is detected.

Further, the above coordinate input device and LCD
An information device that is integrated with a display device such as a device can input a gesture as a command with a pen-shaped writing instrument on the input surface, can be pasted as a memo by entering characters, or can perform character recognition to input characters. There are things you can do.

Further, in some of the above information devices, a keyboard image is displayed to be used as a "virtual keyboard". In this case, when actually used as a substitute for the keyboard, it is input with a finger. Therefore, the coordinate input device used for this purpose uses the above-mentioned resistive film system.

[0010]

However, in the conventional coordinate input device as described above, in particular,
In the case of, since the dedicated pen is used for inputting the coordinates, there is a problem that it is impossible to input using a pen other than the dedicated pen.

Further, particularly in the cases of and, since the coordinates can be input only one by one, there is a problem that a plurality of coordinates in a wide range cannot be input at the same time.

Further, the information equipment using the coordinate input device as described above has the following problems.

First, when a gesture is input as a command, a character is input and pasted as a memo, or character recognition is performed to perform character input, a pen-shaped coordinate indicator is desirable, but text data (in large quantities) When inputting character data), the keyboard is faster and more convenient as before. However, in this case, if the above-mentioned “virtual keyboard” is used instead of the keyboard, the resistance film method as described above is used, and therefore there is a problem that it is impossible to input a plurality of points on the “virtual keyboard”.

Here, when it becomes impossible to input a plurality of points on the "virtual keyboard", [s]
I can't use another key while holding down the [shift] or [cntrl] key.
Since you can only enter one point at a time, such as pointing to another key again after pointing to a key etc., it is not only necessary to change the operation of your finger on the actual keyboard, but also a shortcut key. As described above, there are cases in which input is impossible, and it cannot be a means for completely replacing a keyboard, that is, it cannot be a means for inputting a large amount of data at high speed.

Therefore, the present invention has been made in order to solve such a problem, and an object thereof is to provide a coordinate input device capable of simultaneously inputting a plurality of points and a coordinate input method thereof.

[0016]

In order to solve the above problems, the present invention has the following means.

According to another aspect of the present invention, there is provided a coordinate input device having two layers of resistance films to which a voltage is applied at both ends thereof, and the coordinate value of the position input by pressing on the resistance film is the input state. In the coordinate input device for obtaining from the output potential of the resistance film according to the above, a selection area for selecting the input state set in a part on the resistance film, and the outside of the selection area by pressing on the resistance film. It is determined that there is a one-point input state in which one point is input to the input terminal and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area. The determination means, the storage means for storing the coordinate value of the first point, the coordinate positions of the first point and the second point when the second point is input, and the input of the second point Output potential of the resistance film when made, and the coordinates stored in the storage means A storage means for storing an arithmetic expression for deriving the second point of the coordinate values consisting relational expression between by the determining means, when it is determined that the two-point simultaneous input state is stored in said storage means Depending on the coordinate value
After controlling the reversal of the direction of the voltage applied to the anti-membrane,
The second coordinate value is output from the resistive film based on the above equation.
It is characterized in that it is provided with a calculation control means for obtaining from the potential .

[0018]

According to a second aspect of the present invention, there is provided a coordinate input device having two layers of resistance films to which a voltage is applied at both ends thereof, and the coordinate value of the position input by pressing on the resistance film is the input state. In the coordinate input device for obtaining from the output potential of the resistance film according to the above, a selection area for selecting the input state set in a part on the resistance film, and the outside of the selection area by pressing on the resistance film. It is determined that there is a one-point input state in which one point is input to the input terminal and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area. The determination means, the storage means for storing the coordinate value of the first point, and the predetermined output component of the output potential of the resistive film are removed according to the coordinate value stored in the storage means, and then the removal is further performed. Output potential processing means for amplifying the generated output potential , The respective coordinate positions of the first point and the second point when the second point is input, the output potential of the resistive film when the second point is input, and stored in the storage means. If the two-point simultaneous input state is determined by the storage unit that stores the arithmetic expression for deriving the coordinate value of the second point, which is a relational expression with the coordinate values that have been set, and the determination unit, the above-mentioned two Arithmetic control means for obtaining the coordinate value of the dot from the output potential of the resistance film based on the arithmetic expression via the output potential processing means. Claim 3
The coordinate input method described above has a two-layer resistance film to which a voltage is applied at both ends thereof, and the coordinate value of the position input by pressing on the resistance film is changed according to the input state. In the coordinate input method of the coordinate input device which is obtained from the output potential of 1), a selection area for selecting the input state set in a part of the resistance film, and 1 outside the selection area by pressing on the resistance film. Judgment step of judging a one-point input state in which a point is input and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area And means for storing the coordinate value of the first point
A storing step of storing in a respective coordinate position of the first point and the second point of time of the input of the second point is made, the output potential of the resistive film when the input of the second point is made , The storage
When it is determined that the two-point simultaneous input state is determined in the storing step that stores the arithmetic expression for deriving the coordinate value of the second point that is a relational expression with the coordinate value stored in the means , and in the determining step. , According to the coordinate value stored in the storage means,
After controlling the reversal of the direction of the voltage applied to the anti-membrane ,
The second coordinate value is output from the resistive film based on the above equation.
And a calculation control step obtained from the potential . The coordinate input method according to claim 4 has a two-layered resistance film to which a voltage is applied at both ends, and the coordinate value of the position input by pressing on the resistance film is changed according to the input state. In a coordinate input method of a coordinate input device obtained from an output potential of the resistance film, a selection area for selecting the input state set in a part of the resistance film, and the selection area by pressing on the resistance film. 1 point is input outside 1
A determination step of determining a point input state and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area; and the first point According to the storing step of storing the coordinate value of the storage means in the storing means and the predetermined output component of the output potential of the resistance film is removed according to the coordinate value stored in the storing means , the removed output potential is further An output potential processing step for amplifying, coordinate positions of the first point and the second point when the second point is input, and an output potential of the resistive film when the second point is input. And a storage step of storing an arithmetic expression for deriving the coordinate value of the second point which is a relational expression with the coordinate value stored in the storage means , and the determination step, the two-point simultaneous input state is determined. In case of the above, the coordinate value of the second point is processed through the output potential processing step. And having a computation control step of obtaining the output potential of the resistive film on the basis of serial arithmetic expression.

[0020]

According to the coordinate input device of the first aspect, the arithmetic control means, when the judging means judges that the two points are simultaneously input, according to the coordinate value stored in the storing means,
After performing the reversal control of the direction of the voltage applied to the resistance film, the coordinate value of the second point is obtained from the output potential of the resistance film based on the arithmetic expression stored in the storage means.

[0021]

According to the coordinate input apparatus according to claim 2, the operation control means, when it is determined that two points simultaneous input state by determining means, the output potential process means the coordinate values of the second point It is determined from the output potential of the resistance film based on the above-mentioned calculation formula. According to the coordinate input method of claim 3 ,
The calculation control step is performed according to the coordinate value stored in the storing step when the determination step determines that two points are simultaneously input.
Control the direction of the voltage applied to the resistance film.
After that, the coordinate value of the second point is added to the arithmetic expression stored in the storage process.
Based on the output potential of the resistance film, According to the coordinate input method of claim 4 , in the calculation control step, the coordinate value of the second point is passed through the output potential processing means when the two-point simultaneous input state is determined in the determination step. It is obtained from the output potential of the resistance film based on an arithmetic expression.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing the structure of a coordinate input device according to this embodiment.

The present apparatus, the arithmetic control circuit 1 as an arithmetic control means for performing various calculations and control (decision hand stage), and I / O interface 2, an A / D converter 3, an amplifier 4a, 4b
A panel output switching unit 5 (detection means), a panel mode control unit 6, a panel terminal switching unit 7, and a touch panel 8
And a memory 9 storing various information such as various programs and arithmetic expressions.

The touch panel 8, as shown in FIG.
The shaft film 20a (electrodes are arranged in parallel to the y-axis) and the y-axis film 20b (electrodes are arranged in parallel to the x-axis) are composed of two conductive films 20 as a resistance film.

The conductive film 20 has a uniform resistance distribution, and electrodes 21 to which a voltage is applied are provided at both ends in a direction orthogonal to each other, each having a ground electrode 21a.

The touch panel 8 has a structure in which only the portions of the two conductive films 20 opposed to each other on the conductive surface sides and pressed by a finger or a pen are in contact with each other, and the output potential changes according to the change of the contact position. Therefore, it is possible to detect the coordinates and obtain the coordinates.
Voltage is applied to the other conductive film 2 facing each other.
The output is taken from 0. The output from the touch panel 8 is performed by outputting a high level signal to the panel output switch 5, and is input to the arithmetic control circuit 1 via the I / O interface 2 as a touch input detection signal. is there.

FIG. 2 shows a state in which a voltage is applied in the lateral direction of the x-axis film 20a and an output is taken out from the facing y-axis film 20b.

The panel terminal switching unit 7 is switched by the panel mode control unit 6 so that current flows when the touch panel 8 is pressed.

The memory 9 stores an arithmetic expression of the coordinate value of the second point in the two-point mode described later.

The arithmetic control circuit 1 has two input states (modes) for performing coordinate arithmetic processing. That is, there are two modes, a one-point input mode in which only one point is input, and a two-point input mode (two-point coordinate calculation mode) in which two points are simultaneously input. .

Further, the arithmetic control circuit 1 arbitrarily sets a predetermined area required for selecting the two modes on the touch panel 8, and only when the coordinate input of the predetermined area is made in the one-point input mode. The operation is performed in the two-point input mode until the transition to the two-point input mode and the next determination that there is no touch input.

Further, there is a one-point coordinate memory as a storage means inside the arithmetic control circuit 1, and the data held in this one-point coordinate memory is not updated when two points are input, and the data is stored only when one point is input. It will be updated.

Further, the arithmetic and control circuit 1 includes a touch panel 8
A touch input determination mode for determining whether or not a touch has been made is provided, and the panel mode control unit 6 is set via the I / O interface 2. When a touch input is made, each device is controlled to coordinate. This is to advance the detection procedure.

In this coordinate detection procedure, the arithmetic control circuit 1 sets the panel mode control unit 6 and switches the panel terminal switching unit 7, and the output potential of the touch panel 8 is switched to the panel output switching unit 5.
Is selected by the A / D converter 3 and amplified by the amplifier 4, and then converted into digital data by the A / D converter 3.
It should be noted that this coordinate detection procedure is performed twice for the x-axis and the y-axis.

The coordinates of the A / D conversion data acquired in the coordinate detection procedure are calculated by the arithmetic control circuit 1 according to the two modes of the one-point input or the two-point input = different arithmetic expressions (see the flowchart. Use later).

FIG. 3 shows the potential distribution of one conductive film 20, and equipotential lines are arranged at equal intervals in FIG. When a voltage is applied to the conductive film 20, a potential distribution at equal intervals occurs in its surface, and when a certain point is pressed with a finger or the like, the output potential changes depending on the position,
In FIG. 3, the output potential changes depending on the vertical position. That is, the same output can be obtained at the same horizontal position.

Here is how to obtain this output:
This will be described with reference to FIGS. 4 and 5.

In FIG. 4, when only one point, for example point B, is pressed, the lateral length of the panel is Lxo, the applied voltage is Eo, the distance between the pressed position and the reference surface (up to the ground electrode 21a). X1 = Ex / Eo × Lxo (1), where x1 is the shortest distance) and Ex is the output voltage. In case of 1-point input, position in the horizontal direction from equation (1) =
The x coordinate can be detected directly. The same applies to the y-coordinate, and the y-coordinate can be detected by switching the panel applied voltage, that is, by applying the voltage to the y-axis film 20b and extracting the output potential from the x-axis film 20a.

Here, DC or AC can be used as the power source applied to the panel, and it is possible to detect not only the potential but also the current shunt ratio.

It is assumed that the coordinate data at the time of inputting the last one point is used at the time of inputting two points, when the coordinate input device of the present invention is used as a virtual keyboard. When used as a keyboard, the operation of pressing two points (pressing two keys) cannot occur at exactly the same time. That is, normally, when pressing another Roman key while pressing the shift key, or when hitting another key while pressing the cntrl key, it is common to press one key as the operation of the finger (hand), The action of hitting another key is natural. Therefore, in this device, when two points are input (contact), one input point is almost fixed and does not move, and the other input point is detected as unknown input data. Two points are input at the same time. It utilizes the fact that there is nothing.

Even after the transition to the two-point coordinate value calculation mode, if the second point is not input, the obtained output potential does not change. At that time, whether to output the same two coordinate values or output only one point coordinate may be selected according to the usage conditions.

Here will be described what happens to the output potential when two points are input in the configuration as shown in FIG. First, FIG.
As described above, when points A and B are pressed simultaneously, that is, when there are two inputs, the current paths between points A and B are two paths of the upper and lower conductive films 20. Is. That is,
When the contact resistance at the contact points of the two conductive films 20 is small enough to be ignored by being pressed with sufficient pressure, points A and B
The resistance between the points is about half that of the unpressed state.

FIG. 5 shows equipotential lines when two points are input. The equipotential lines are broken from the state of parallel straight lines. Since the resistance value between the two points, which are the contact points, decreases, the interval of equipotential lines between the two points widens. The potential at the contact point (points A and B) is such that the resistance between A and B is approximately 1/2, so the potential Ea at point A is: Ea = (Δx / 2 + x1) / (Lxo−Δx / 2) × Eo (2) Similarly, the potential Eb at the point B is Eb = x1 / (Lxo−Δx / 2) × Eo (3). Therefore, the x-axis film 20a and the y-axis film 20
The output potential of b is not a value proportional to each coordinate value.

Next, a calculation method for obtaining the coordinates of the second point from the output potential will be described. The output potential of the x-axis film 20a changes not only by the two x-axis positions but also by the two y-axis positions. That is, the output potential also changes depending on the axial position of the opposing y-axis film 20b for taking out the output. The potentials at points A and B do not become the output potential. Since FIG. 4 is a schematic diagram, the extraction electrode position is the same as that of the x-axis film 20a.
As described above, the electrode positions of the conductive film 20 are orthogonally opposed to each other. When the resistance films of the two conductive films 20 have almost the same resistance value and the pressing at the contact point is sufficient and the contact resistance is sufficiently small, the distance between the point A and the extraction electrode surface (the shortest distance to the extraction electrode) ) Is ya and that at the point B is yb, the output potential Ex2 is as follows: Ex2 = (yb * Ea + ya * Eb) / (ya + yb) (4) Thus, the output of the resistance bridge is obtained.

Similarly, the output when a voltage is applied to the y-axis film 20b (for conventional y-coordinate detection) is shown in the following equation.

Ey2 = (x2 × E1 + x1 × E2) / (x1 + x2) (5) where Δx = x2-x1 E1 = (Δy / 2 + y1) / (Lyo-Δy / 2) × Eo E2 = y1 / (Lyo) −Δy / 2) × Eo Δy = y2-y1 Here, FIGS. 6 and 7 show plots of the actual output potentials of the conductive film 20 when two points are input. FIG. 6 is a plot of the output potential in the x direction, and FIG. 7 is a plot of the output potential in the y direction.

A known input point, that is, the final input point at the time of inputting one point is set as (x1, y1) as the first input point,
The newly pressed second point is defined as (x2, y2). 6,
In FIG. 7, the output potential value at the time of two-point input when the first point (x1, y1) is in the center of the touch panel 8, the value of (x2, y2) on the graph, and the output potential value (vertical axis) ) Uses standardized values. At this time, the coordinates of the center of the touch panel 8 are (0.5, 0.5) by standardization.

As shown in the graphs of FIGS. 6 and 7,
The output is uniquely determined for the value of (x2, y2). That is, two kinds of (x2, y2) values cannot be obtained from a pair of output potentials in the x and y directions when two points are input.

Therefore, in the arithmetic expressions of (4) and (5) above,
By substituting the coordinate data loaded from the one-point coordinate memory, the coordinate data of another point (x2, y
Since 2) is obtained, the output of this device to the host etc. outputs two coordinate data, the coordinate data (x2, y2) obtained by the operation and the coordinate data (x1, y1) used in the operation. It is possible.

Next, the operation of this embodiment having the above-mentioned configuration will be described.
Focusing on the operation of coordinate calculation by the arithmetic control circuit 1, FIG.
This will be described with reference to the flowchart of FIG. FIG. 8 shows the operation in the 1-point input mode, and FIG. 9 shows the operation in the 2-point coordinate calculation mode as a subroutine. still,
Unless otherwise specified, the arithmetic control circuit 1 performs the following operations.

First, when a touch input is made on the touch panel 8 by a user's finger or the like, the arithmetic and control circuit 1 switches the panel terminal switch 7 to select the touch input determination mode (S1).
Touch input determination is performed by (S2). Here, when there is a touch input, first, the arithmetic control circuit 1 sets the panel mode control unit 6 and switches the panel terminal switching unit 7 to calculate the x coordinate, and the output potential of the touch panel 8 is changed to It is amplified by the amplifier 4. After this, the A / D converter 3
Starts A / D conversion of this amplified output potential (S3).

Next, the arithmetic control circuit 1 judges whether or not the A / D conversion is completed (S4), and if not completed, continues the A / D conversion operation. If you are done,
The A / D converter 3 outputs the data after A / D conversion to the operational control circuit 1 as an x coordinate output via the I / O interface 2 (S5).

When the output of the x coordinate is completed, the operation control circuit 1 starts the A / D conversion for calculating the y coordinate (S6). Then, it is judged whether the A / D conversion is completed (S7), and if not completed, the A / D conversion is continued.
Performs conversion operation. When completed, the data after A / D conversion is output to the arithmetic control circuit 1 as the y-coordinate output via the I / O interface 2 (S8).

Next, the arithmetic and control circuit 1 again determines the touch input in the touch input determination mode (S9) and determines whether the touch has been completed during execution of the coordinate detection procedure (S10). If it is determined that the touch input has not been made (if the touch is completed in the middle of execution), the obtained data is also unreliable, and the acquired data is invalidated and discarded (S11).

If the touch is not yet finished, the obtained coordinate value is stored in the one-point coordinate memory in the arithmetic control circuit 1 and the memory value is updated (S12). It is determined whether or not it is within a predetermined area (S13), and when it is within the predetermined area, it jumps to the two-point coordinate calculation mode (subroutine = FIG. 9) (S14).
If it is not within the predetermined area, this ends the flow of the one-point input mode once.

When the coordinate values are present in the predetermined area and it is determined that two points are input, the process jumps to the subroutine of the two-point coordinate calculation mode in FIG.

First, when the x-axis film potential is detected (S15), the A / D converter 3 starts A / D conversion (S16).

Next, it is judged whether the A / D conversion is completed (S17), and if not completed, the A / D conversion operation is continued. When completed, the data is output to the arithmetic control circuit 1 via the I / O interface 2 (S18).

When the output of the x coordinate is completed, the film potential on the y axis is detected (S19), and the A / D conversion for calculating the y coordinate is started (S20). Next, it is judged whether or not the A / D conversion is completed (S21), and if not completed, the A / D conversion operation is continued. When completed, the data is output to the arithmetic control circuit 1 through the I / O interface 2 (S22). In addition, after capturing the data, the previous sampled 1-point input coordinate data is
It is loaded from the point coordinate memory (23). The arithmetic control circuit 1 uses this data as one of the data when two points are input, and calculates the coordinate value of the second point (24). When the calculation is completed, the touch input is discriminated again as in the case of one-point input (S25), and if there is a touch input, the processing procedure of FIG. 6 is repeatedly executed until the touch input is completed.

If the arithmetic control circuit 1 determines that the touch input is not made here (if the touch is completed during execution), the obtained data is also unreliable and the obtained data is invalidated and discarded. (S27) With this,
The 2-point coordinate calculation mode subroutine is ended.

According to the present embodiment having the above structure, the same touch panel 8 as the conventional one is used, and the two conductive films 2 are used.
Since the coordinate data of the second point (two unknowns of x coordinate and y coordinate) in the 2-point input mode is calculated from the output potential data of 0, the coordinate input device capable of 2-point input has a simple configuration. It can be realized.

Further, since a coordinate input device capable of simultaneously inputting two points can be realized with a simple structure without changing the touch panel unit, when this device is applied to an information device using a virtual keyboard, It is possible to construct a virtual keyboard whose input operation is the same as that of the actual keyboard.

(Second Embodiment) Next, a second embodiment of the present invention will be described.

The present embodiment has the same configuration as that of the first embodiment except for the panel terminal switch 7 and the arithmetic control circuit 1.

The panel terminal switching unit 7 has a switching operation of 1
It is simply configured by an electronic switch such as an FET so as to change according to the value of the point coordinate memory. .

Further, since the origin position of the coordinate obtained by the calculation is changed at the same time when the panel terminal switch 7 is switched, the calculation control circuit 1 is further configured to further perform the coordinate conversion process after the coordinate calculation process.

Next, how to switch the panel terminal switching unit 7 according to the value of the one-point coordinate memory will be described.

In FIG. 10 and FIG. 11, coordinate data (x1, y
1) shows the output potential when (0.1, 0.1) [= normalized value]. FIG. 10 is a plot of the output potential in the x direction, and FIG. 11 is a plot of the output potential in the y direction.

Compared to FIGS. 6 and 7, the output potential values in FIGS. 10 and 11 are not largely changed. The small amount of change in the output potential value indicates that the coordinate data (x
2, y2) leads to a decrease in calculation resolution. Actually, there is no problem in using it when virtual data is provided on the entire surface of the touch panel, but the touch panel becomes large, and when using part of it as a virtual keyboard for input, low resolution becomes a problem. .

Coordinate data (x1, y) is shown in FIGS.
X-axis film 20a when 1) is (0.9, 0.9)
And the value of the output potential of the y-axis film 20b. 12
Is a plot of the output potential in the x direction.
3 is a plot of the output potential in the y direction.

From this graph, (x1, y1) = (0.
It can be seen that a sufficient output range and higher resolution can be obtained than in the case of 1, 0.1).

Here, note that the actual coordinate values on the graph change depending on the direction of the applied voltage Eo in FIG. That is, when the direction of Eo is reversed, x1 = 0.1 becomes x1 = 0.9. Therefore, for example, (x1, y1)
= (0.1, 0.1), when the coordinate value leads to a decrease in calculation resolution when obtaining (x2, y2), switch the panel terminal switching unit 7 to obtain a sufficient output range. Good.

Therefore, according to the above configuration, by switching the panel terminal switching unit 7 and changing the direction of the applied voltage according to the value of the one-point coordinate memory, it is possible to input two points with high resolution.

(Third Embodiment) Next, a third embodiment of the present invention will be described.

FIG. 14 shows a block diagram of the configuration of this embodiment.

In addition to the structure of the first embodiment, this apparatus has slice circuits 10a and 10b for cutting DC components below the minimum output level of the touch panel 8 and an amplifier 4.
It is configured by providing variable amplifiers 11a and 11b in which a and 4b are variable.

The present apparatus having the above-mentioned configuration adopts a method for optimizing another detection range as a method for improving the resolution of the output potential, instead of the method for switching the applied voltage according to the second embodiment.

That is, since it is possible to judge that this method can obtain only the output in the range as shown in FIG. 8, it is possible to judge by looking at the value of the one-point coordinate memory, so that the output change is the input range of the A / D conversion. This is because the detection resolution is maximized if it coincides with the slice circuits 10a and 10b.
Is provided, the DC component below the minimum output level is cut, and the output of the touch panel 8 is processed by the variable amplifiers 11a and 11b at a maximum amplification rate that is not saturated at the maximum output.

As a result, a coordinate input device having a higher calculation resolution is realized.

Further, since the signal processing of the touch panel output is devised in accordance with the input position, when this device is applied to an information device using a virtual keyboard, it is sufficient even if the size of the virtual keyboard becomes small. It is possible to input coordinates with calculation resolution.

[0083]

As described in detail above, the present invention has the following effects.

[0084] According to the invention of claim 1 or 3, wherein, when it is determined that two points simultaneous input state, in response to store coordinate values, performs inversion control the direction of the voltage applied to the resistive film Therefore, with a simple configuration without adding a complicated device,
A coordinate input device capable of simultaneously inputting two points can be realized. This makes it possible to provide a coordinate input device that can form a virtual keyboard whose input operation is the same as that of the actual keyboard.

[0085]

According to the invention of claim 2 or 4 , the coordinate value of the second point is obtained through the output potential processing means in the state of simultaneous input of two points. Therefore, the coordinate input device having further sufficient calculation resolution. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a touch panel 8.

3 is a potential distribution diagram of the conductive film 20. FIG.

FIG. 4 is an explanatory diagram for obtaining an output potential of the touch panel 8.

FIG. 5 is a potential distribution diagram of the conductive film 20 when two points are input.

FIG. 6 is an output potential characteristic graph in the x direction [(x1, y1).
= (0.5, 0.5)].

FIG. 7 is a graph of an output potential characteristic in the y direction [(x1, y1).
= (0.5, 0.5)].

FIG. 8 is a flowchart showing the operation of the first exemplary embodiment of the present invention.

FIG. 9 is a flowchart showing an operation in a two-point input coordinate calculation mode.

FIG. 10 is an output potential characteristic graph in the x direction [(x1, y
1) = when (0.1, 0.1)].

FIG. 11 is an output potential characteristic graph in the y direction [(x1, y
1) = when (0.1, 0.1)].

FIG. 12 is an output potential characteristic graph in the x direction [(x1, y
1) = (0.9, 0.9)].

FIG. 13 is an output potential characteristic graph in the y direction [(x1, y
1) = (0.9, 0.9)].

FIG. 14 is a schematic block diagram of a third embodiment.

[Explanation of symbols]

1 Operation control circuit 2 I / O interface 3 A / D converter 4a, 4b amplifier 5 panel output switch 6 Panel mode controller 7 panel terminal changer 8 touch panel 9 memory 10a, 10b slice circuit 11a, 11b variable amplifier

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryozo Yanagisawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Katsuyuki Kobayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Yuichiro Yoshimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) Reference JP-A-1-269120 (JP, A) JP-A-5-265632 (JP , A) JP-A-4-60715 (JP, A) JP-A-1-318110 (JP, A) Actually developed 63-103138 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G06F 3/03-3/037

Claims (4)

(57) [Claims] 1. A resistance film of two layers to which a voltage is applied is provided at both ends, and the coordinate value of the position input by pressing on the resistance film is output by the resistance film according to the input state. In a coordinate input device obtained from a potential, a selection area for selecting the input state set in a part of the resistance film, and one point is input outside the selection area by pressing on the resistance film 1 Determination means for determining a point input state and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area; and the first point Storage means for storing the coordinate values of, the coordinate positions of the first point and the second point when the second point is input, and the resistive film of the resistance film when the second point is input. The above-mentioned 2 consisting of a relational expression between the output potential and the coordinate value stored in the storage means. Storage means for storing a calculation formula for deriving the coordinate value of the eye, by the determining means, when it is determined that the two-point simultaneous input state, according to the stored coordinates in the storage unit
Control the direction of the voltage applied to the resistance film.
After that, the coordinate value of the second point is calculated based on the above equation.
A coordinate input device, comprising: arithmetic control means for obtaining an output potential of the anti-membrane . 2. A resistance film of two layers to which a voltage is applied is provided at both ends, and the coordinate value of a position input by pressing on the resistance film is output by the resistance film according to the input state. In a coordinate input device obtained from a potential, a selection area for selecting the input state set in a part of the resistance film, and one point is input outside the selection area by pressing on the resistance film 1 Determination means for determining a point input state and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area; and the first point Storage means for storing the coordinate values of the output voltage, and an output for amplifying the removed output potential after removing a predetermined output component of the output potential of the resistance film according to the coordinate values stored in the storage means. No potential processing means and no input of the second point From the relational expressions of the coordinate positions of the first point and the second point, the output potential of the resistive film when the second point is input, and the coordinate value stored in the storage means. In the case where it is determined by the storage unit that stores the arithmetic expression for deriving the coordinate value of the second point, and the determination unit is in the two-point simultaneous input state, the coordinate value of the second point is the output potential. A coordinate input device, comprising: an arithmetic control unit that obtains the output potential of the resistive film based on the arithmetic expression via a processing unit. 3. A resistance film of two layers to which a voltage is applied is provided at both ends, and the coordinate value of the position input by pressing on the resistance film is output by the resistance film according to the input state. In the coordinate input method of a coordinate input device obtained from an electric potential, a selection area for selecting the input state set in a part of the resistance film, and one point outside the selection area by pressing on the resistance film A determination step of determining a one-point input state to be input and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area; A storage step of storing the coordinate value of the first point in a storage means, the coordinate positions of the first point and the second point when the second point is input, and the second point are input. an output potential of the resistive film when a, stored in the storage unit coordinate values A storage step for storing a calculation formula for deriving the consisting equation the coordinates of the second point, in the determination step, when it is determined that the two-point simultaneous input state is stored in said storage means According to the coordinate values,
After controlling the reversal of the direction of the voltage applied to the resistive film,
The coordinate value of the second point is calculated from the resistance film based on the arithmetic expression.
A coordinate input method, which comprises a calculation control step of obtaining from an output potential . 4. A resistance film of two layers to which a voltage is applied is provided at both ends, and the coordinate value of a position input by pressing on the resistance film is output by the resistance film according to the input state. In the coordinate input method of a coordinate input device obtained from an electric potential, a selection area for selecting the input state set in a part of the resistance film, and one point outside the selection area by pressing on the resistance film A determination step of determining a one-point input state to be input and a two-point simultaneous input state in which the second point is continuously input while the first point is input in the selection area; According to the storing step of storing the coordinate value of the first point in the storing means, a predetermined output component of the output potential of the resistive film is removed according to the coordinate value stored in the storing means , and the removal is further performed. And an output potential processing step for amplifying the output potential An output potential of the resistive film when the coordinate position of the first point and the second point of time of the input of the second point is made, the input of the second point is made, stored in said storage means The storage step of storing an arithmetic expression for deriving the coordinate value of the second point, which is a relational expression with the coordinate values, and the two points if the two-point simultaneous input state is determined in the determination step. And a calculation control step of obtaining coordinate values of eyes from the output potential of the resistance film based on the calculation formula through the output potential processing step.