JPH11232023A - Resistant film type input device and position detecting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resistant film type input device small in size, fast in signal processing speed and capable of detecting two points pressed at the same time and to provide a position detecting method therefor. SOLUTION: By switching a switching means respectively connected to electrodes Xa1 , Xa2 , Xb1 and Xb2 , a resistance measuring means is connected between the electrodes Xa1 and Xa2 and when full resistant films 10 and 11 are mutually conducted at two points P1 and P2 in the state of opening the electrodes Xb1 and Xb2 , resistance Rx1 between the point P1 closer to the electrodes Xa1 and Xa2 and the electrode Xa1 is measured by the resistance measuring means so that the X coordinate of the point P1 can be found from this measured value. Next, when the switch means is switched, the electrodes Xa1 and Xa2 are opened and the resistance measuring means is connected between the electrodes Xb1 and Xb2 , resistance Rx3 between the point P2 closer to the electrodes Xb1 and Xb2 and the electrode Xb1 is measured by the resistance measuring means and from this measured value, the X coordinate of the point P2 can be found.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistive input device for detecting a position depressed by a pen, a finger or the like, and a position detecting method therefor.

[0002]

2. Description of the Related Art FIG.
There was a so-called analog type as shown in FIG. In this resistive film type input device, a pair of substantially rectangular insulating sheets face each other with their four sides aligned, and a resistance is formed over the entire opposing surface of each insulating sheet, so that the entire resistive films 10 and 20 are formed. . The entire surface resistance films 10 and 20 are opposed to each other via a spacer (not shown), and are usually supported so that the entire surface resistance films 10 and 20 do not contact each other. Full resistance film 1
The electrodes Xa and Xb are formed on two opposing sides of 0, respectively, and the entire resistive film 10 on which the electrodes Xa and Xb are formed is formed.
Electrodes Ya and Yb are formed on two opposing sides of the overall resistance film 20 which are substantially orthogonal to the two sides.

As shown in FIG. 6, electrodes Xa and Ya are
Switch means S₁Through the voltage V₁Is applied and the switch
Switch means S₁Switching between electrodes Xa and Ya
One of them is voltage V₁Is applied. Further, the electrodes Xb, Y
b is a switch means S _Two, S_ThreeConnected to
Switch means S_Two, S_ThreeElectrode X by switching
One of b and Yb is connected to the ground,
The other of the electrodes Xb and Yb is connected to the voltage detecting means 30.
It is. The switch means S₁~ S_ThreeSwitches in conjunction
available.

Here, the whole surface resistance is applied by a pen 40 or a finger.
When the point P of the film 10 is depressed, the entire surface resistance films 10 and 2
0 conducts each other at the depressed portion (point P). S
Switch means S₁Is on the electrode Ya side, and the switch means S_TwoIs
On the pole Yb side, switch means S _ThreeOn the electrode Xb side
When switching is performed, the electrodes Ya,
Voltage V between Yb₁Is applied, and the resistance between the electrode Ya and the point P is
Ry₁And the resistance Ry between the electrode Yb and the point P_TwoAnd by partial pressure
The applied voltage is the resistance Rx between the electrode Xb and the point P._TwoThrough
It is input to the voltage detecting means 30. On the other hand, switch means S
₁Is on the electrode Xa side, and the switch means S_TwoIs on the electrode Xb side,
Switch means S_ThreeAre switched to the electrode Yb side, respectively.
Then, the voltage V is applied between the electrodes Xa and Xb of the overall resistance film 10.₁But
Applied, and a resistance Rx between the electrode Xa and the point P.₁And electrode Xb ~
Resistance Rx between points P_TwoAnd the voltage divided by the resistor R
y_TwoIs input to the voltage detecting means 30 via the. Accordingly
From the voltage detected by the voltage detecting means 30,
The X and Y coordinates of the 0, 20 pressed parts (point P)
Of the switch means corresponding to the point P.
Operation can be performed (Japanese Unexamined Patent Application Publication No. 7-334289).
Reference).

[0005] In a resistive film type input device, strip-like resistive films are arranged on two opposing surfaces of a pair of opposing insulating sheets in two directions (X direction and Y direction) orthogonal to each other. There was also a so-called matrix type formed. In this resistive film type input device, for example, one end of an X-direction resistive film formed on one of the insulating sheets is pulled up via a resistor, the voltage at the other end of the resistive film is detected, and the other insulating sheet is detected. Are successively grounded to the ground. Normally, the opposed sheets are supported so as not to contact each other, and when the opposed sheet is pressed with a pen or a finger or the like, the X-direction resistive film and the Y-direction resistive film corresponding to the pressed-down portions are pressed. Are conducted. Here, if the Y-direction resistance film grounded to the ground and the X-direction resistance film are not conducting, the voltage at the other end of the X-direction resistance film becomes high, and the Y-direction resistance grounded to the ground. If the resistance film and the resistance film in the X direction are conductive, the potential at the other end of the resistance film in the X direction becomes low.
The position of the depressed part can be detected from the potential of the other end of the resistive film in the direction.

[0006]

The above-mentioned resistive film type input
Among the devices, the analog type resistive film type input device
As shown in FIG.
Two points P on the membrane 10₁, P_TwoIs pushed down,
The anti-membrane 10, 20 is pushed down two points P₁, P_TwoIn each other
Is conducted. Here, the switch means S₁Is the electrode Xa side
And switch means S _TwoIs on the electrode Xb side, and the switch means S
_ThreeAre switched to the electrode Yb side,
Voltage V between electrodes Xa and Xb of sheet resistance film 10₁Is applied
Electrode Xa to point P₁Resistance Rx between₁And two points P₁, P
_TwoThe resistance Rx of the entire resistive films 10 and 20 between _Two, Ry_TwoIf
The sum of the formation resistance and the point P_Two-Resistance Rx between electrodes Xb_ThreeAnd by
Is divided by the point P_Two-Resistance Ry between electrodes Yb
_ThreeIs input to the voltage detecting means 30 via the. On the other hand, Sui
Switch means S₁Is on the electrode Ya side, and the switch means S_TwoIs an electrode
On the Yb side, switch means S_ThreeCut to the electrode Xb side
When the electrodes Ya and Y of the overall resistance film 20 have been replaced,
Voltage V between b₁Is applied, and the electrodes Ya to P₁Resistance between
Ry₁And two points P₁, P_TwoResistance Rx between_Two, Ry_TwoIf
The sum of the formation resistance and the point P _Two-Resistance Ry between electrodes Yb_ThreeAnd by
Is divided by the resistor Rx_ThreeThrough the voltage detection hand
Input to stage 30. That is, two points P₁, P_TwoThe average of
A potential proportional to the coordinates of the point corresponding to the value is detected
Cannot operate the part intended by the user
There was a problem. Especially in the FA field,
Important functions to increase the reliability and safety of
The switch that has
It is desirable to enable the function, but analog type resistive film
Since two-point pressing cannot be detected with the
Enabling the function of the switch when pressed
And could not.

On the other hand, in the matrix type resistive film type input device, since the pressed portion is detected by sequentially scanning the resistive films in the X and Y directions, when a plurality of points are simultaneously pressed down. However, it is possible to detect the position of each point, but if the operation area is large and it is necessary to increase the resolution, a pattern for connecting an external detection circuit to each of the resistive films in the X and Y directions is required. And the number of patterns provided around the operation surface has increased. Therefore, there is a problem that the area corresponding to the frame around the operation surface increases, and the outer shape of the product increases.
Further, since it is necessary to scan all the resistive films in the X and Y directions in order to detect the pressing point, there is a problem that the time of signal processing increases as the number of matrices increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a small-sized resistive film input device capable of detecting two-point pressing and having a high signal processing speed. It is in.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a pair of full resistance films which are opposed to each other and are electrically connected to each other at a depressed portion. Switch means respectively connected to both ends of the pair of the entire surface resistive film via the switch means, resistance measuring means for measuring the resistance value between the ends, The switch means opens one end of each of the pair of full resistance films and connects the resistance measurement means between the other ends, and the resistance measurement means between one ends of the pair of full resistance films. The connection and the state of opening the other end are alternately switched, and even when two points of the entire resistance film are simultaneously pushed down, the side close to the end of the entire resistance film to which the resistance measuring means is connected is connected. Dot position of It is possible to detect the resistance value proportional to, it is possible to determine the position of a point that has been pushed down from the resistance value, by switching alternately the ends for connecting the resistance measuring means, depressed simultaneously 2
The position of a point can be detected.

According to a second aspect of the present invention, in the first aspect of the present invention, the whole surface resistance film is formed in a substantially rectangular shape, and two pairs of the whole surface resistance film are provided so as to oppose each other with their sides aligned. The electrodes to which the switch means are respectively connected are formed on two opposing sides of the entire surface resistive film, and the switch means is respectively provided on two opposing sides of the other set of the entire resistive film substantially orthogonal to the two sides. Since the electrodes to be connected are respectively formed, the electrodes for connecting the resistance measuring means are alternately switched as in the first aspect of the invention.
It is possible to detect the positions of the two points pressed down at the same time.

According to the third aspect of the present invention, a pair of substantially rectangular full-length resistance films which are arranged to face each other with their sides aligned and which are electrically connected to each other at a depressed portion, and four end portions of the pair of full-length resistance films are provided. And a resistance measuring means connected between the one ends of the pair of full-surface resistance films via the switching means, and measuring a resistance value between the ends, wherein the switching means is A state in which one of the opposite ends of the pair of full-surface resistance films is opened and the resistance measuring means is connected between the other ends, and a state in which one of the opposite ends of the pair of full-surface resistance films is connected. The state where the resistance measuring means is connected and the state where the other end is opened are alternately switched. Even when two points of the entire resistance film are simultaneously pushed down, the side close to the end to which the resistance measuring means is connected is connected. To the position of the point Can be detected resistance value,
Since the position of the depressed point can be obtained from this resistance value, the position of the two points depressed simultaneously can be detected by switching the end to which the resistance measuring means is connected.

According to a fourth aspect of the present invention, in the third aspect of the present invention, electrodes to which switch means are respectively connected are formed on four sides of the entire surface resistive film, and the switch means comprises a pair of opposed full surface resistive films. A state in which the electrodes formed on one side of the sides are opened and the resistance measuring means is connected between the electrodes formed on the other side, and one of two opposite sides of the pair of full-surface resistance films The resistance measurement means is connected between the electrodes formed on the other side and the state in which the electrodes formed on the other side are respectively opened is alternately switched,
Similarly to the third aspect of the present invention, by switching the electrodes connected to the resistance measuring means, it is possible to detect the positions of the two points which are simultaneously depressed.

According to the fifth aspect of the present invention, a pair of full-surface resistance films are disposed so as to be electrically connected to each other at a depressed portion, and one end of each of the pair of full-resistance films is opened via a switch means. Connecting a resistance measuring unit between the other ends of the pair of full-surface resistance films via a switch unit and measuring a resistance value between the other ends of the pair of full-surface resistance films, A resistance measuring means is connected between one ends of the resistive films via a switch means, and the other ends of the pair of full-surface resistive films are respectively opened via a switch means, and the pair of the full-surface resistive films are connected to each other. The resistance value between the other ends is measured to detect the positions of the two points depressed from the two resistance values. Even when two points of the entire resistive film are depressed simultaneously, the resistance measuring means Is connected to the entire resistive film The resistance value proportional to the position of the point closer to the end can be detected, and the position of the point depressed can be determined from this resistance value. Can be detected alternately to detect the positions of two points that have been simultaneously depressed.

According to the sixth aspect of the present invention, a pair of substantially rectangular resistive films are disposed so as to face each other so as to be electrically connected to each other at the depressed portion, and electrodes are respectively disposed on four sides of the pair of resistive films. Is formed, and a pair of opposed resistive films 2
The electrodes formed on one side of the sides are opened via switch means, respectively, and the resistance measurement means is connected between the electrodes formed on the other side via switch means to obtain a resistance value between the electrodes. After the measurement, the resistance measuring means is connected via the switch means between the electrodes formed on one of the two opposing sides of the pair of full-surface resistance films, and the electrode formed on the other side is connected to the other side. Each is opened via the switch means, the resistance between the electrodes is measured, and the positions of the two points depressed from the two resistances are detected, and the two points of the entire resistive film are depressed simultaneously. In this case, the resistance measuring means can detect the resistance value in proportion to the position of the point closer to the connected electrode, and the position of the point depressed can be obtained from this resistance value. Electrode connecting means By switching each other, it is possible to detect the position of the two points which are depressed at the same time.

[0015]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) The resistive film type input device of the present embodiment is used for a programmable display or the like, and as shown in FIG. 1, a pair of substantially rectangular insulating sheets arranged so as to face each other with their sides aligned. 1 are provided on the entire surface facing the insulating sheet of the upper set in FIG. 1 to form the entire surface resistance films 10 and 11, and the opposing surfaces of the insulating sheet of the lower set in FIG. Resistors are provided over the entire surface to form the entire resistive films 20 and 21. Here, the entire surface resistive film 1
Spacers (not shown) are interposed between 0 and 11 and between the entire resistance films 20 and 21, respectively. Normally, the entire resistance films 10 and 11 and the entire resistance films 20 and 2 are provided by the spacers.
1 are supported so as not to contact each other.
Then, the full-resistance films 10 and 11 and the full-resistance films 2 are depressed by pressing down the full-resistance films 10 with a pen 40 or a finger.
0 and 21 conduct with each other.

[0016] are respectively electrodes Xa ₁ facing the two sides of the entire resistive layer 10, Xb ₁ is formed, electrodes Xa _1,
Electrodes Xa ₂ and Xb ₂ are formed on two sides of the overall resistance film 11 corresponding to Xb ₁ , respectively. On the other hand, electrode X
Electrodes Ya ₁ and Ya 2 are provided on two sides of the entire surface resistance film 20 substantially orthogonal to the two sides of the entire surface resistance film 10 on which a ₁ and Xb ₁ are formed, respectively.
Yb ₁ is formed, the electrode Ya _1, each of the two sides electrodes Ya ₂ the entire surface of resistive film 11 corresponding to Yb _1, Yb
₂ are formed.

As shown in FIG. 2, the switch means S ₁ is connected to the electrode Xa _1, Xb _1, the electrode Xa _2, Xb ₂ are connected to the switching means S _2. Switch means S
_1, S ₂ are switched by a not-shown CPU, by switching the switching means S _1, S _2, between the electrodes Xa _1, Xa _2, or a constant current source to either one of between the electrodes Xb _1, Xb ₂ 1 is connected to the voltage detecting means 30 composed of, for example, an A / D converter, and the other is opened.
Here, the constant current source 1 and the voltage detecting means 30 constitute a resistance measuring means.

For example, by switching the switch means S ₁ , S ₂ , one electrode X of the entire surface resistive films 10, 11 is formed.
a _1, between Xa ₂ to thereby connect the constant current source 1 and the voltage detecting means 30, the other electrode X of the entire resistive films 10 and 11
When b ₁ and Xb ₂ are respectively opened, the voltage detecting means 30
As a result, a voltage generated between the electrodes Xa ₁ and Xa ₂ is detected. Here, when the two points P ₁ and P ₂ of the overall resistance film 10 are pushed down, the overall resistance films 10 and 11 become two points P ₁ and P 2.
Conducting with each other at ₂ . 2 points P _1, since the direction of the point P ₁ than the point P ₂ among P ₂ is closer to the electrode Xa _1, Xa _2, electrode X
resistance between a _1, Xa ₂ is a resistor Rx ₁ of the entire resistive layer 10 between electrodes Xa ₁ ~ point P _1, the resistance Rx ₁ of the entire resistive layer 11 between electrodes Xa ₂ ~ point P ₂ '(= Rx ₁ ) (= 2
Rx ₁ ). Thus, electrodes Xa _1, Xa is between ₂ voltage proportional to the resistance 2Rx ₁ is generated, the entire surface resistance film 1 between the electrodes Xa ₁ ~ point P ₁ from the measured value of the voltage detecting means 30
Resistance Rx ₁ 0 can be obtained. Electrodes Xa _{1 to} X
b between _1, the resistance between the electrodes Xa ₂ ~Xb ₂ are known, since each is Rx _0, to determine the X-coordinate of the point P ₁ is pushed down by performing the calculation of (Rx ₁ / Rx ₀₎ Can be.

Next, the switch means S₁, S_TwoSwitch
And one electrode Xa of the entire resistive films 10 and 11₁, Xa_Two
Are respectively opened, and the other electrodes of the entire surface resistive films 10 and 11 are opened.
Xb ₁, Xb_TwoBetween the constant current source 1 and the voltage detecting means 30.
Then, the electrode Xb is detected by the voltage detecting means 30.₁, Xb
_TwoAn intervening voltage is detected. Where the resistive film
2 points P of 10₁, P_TwoIs pushed down, and the entire surface resistive film 1
0 and 11 are 2 points P₁, P _TwoWhen conducting with each other,
2 points P₁, P_TwoWithin the point P₁Point P than_TwoIs the electrode X
b₁, Xb_TwoThe electrode Xb₁, Xb_TwoResistance between
The value is the electrode Xb₁~ Point P_TwoThe resistance R of the entire surface resistive film 10 between
x_Three And the electrode Xb_Two~ Point P_TwoResistance of the entire surface resistive film 11 between
Value Rx_Three'(= Rx_Three) And (= 2Rx_Three)become. I
Therefore, the electrode Xb₁, Xb_TwoResistance 2Rx between_ThreeCompared to
The example voltage is generated, and the voltage is
Pole Xb₁~ Point P_TwoThe resistance Rx of the entire surface resistance film 10 between_Three Seeking
｛(Rx₀-Rx_Three) / Rx₀演 performance
The point P depressed by performing the calculation_TwoFind the X coordinate of
Can be

Further, by switching the switch means,
Electrode Ya of sheet resistance films 20 and 21₁, Ya_TwoConstant current source
1 and the voltage detecting means 30 and the electrode Yb
₁, Yb_TwoAre respectively opened, and the voltage detection means 30
Electrode Ya₁, Ya_TwoDetect the voltage generated between them. So
Then, from the measured value of the voltage detecting means 30, the electrode Ya₁, Y
a_TwoPoint P on the side closer to_TwoAnd the electrode Ya₁(Ya_Two) Between
Resistance Ry₁And the electrode Ya₁, Yb₁Resistance Ry between₀
And resistance Ry₁Operation (Ry₁/ Ry₀To do)
Therefore point P_TwoIs determined. Next, switch means
By switching, the electrodes Ya of the entire resistive films 20 and 21 are switched.₁, Ya
_TwoRespectively, and the electrodes Yb₁, Yb_Twowhile
The constant current source 1 and the voltage detecting means 30 are connected to
The output means 30₁, Yb_TwoVoltage generated between
Is detected. Then, from the measured value of the voltage detecting means 30,
Electrode Yb₁, Yb_TwoPoint P on the side closer to₁And the electrode Yb₁(Y
b _Two)_ThreeAnd the resistance Ry₀And resistance R
y_ThreeThe operation ｛(Ry₀-Ry_Three) / Ry₀｝ Do
And the point P₁Is determined.

As described above, the switch means S ₁ , S
₂ is one end of the entire surface resistive films 10 and 11 (that is, the electrode X
a ₁ , Xa ₂ ) are opened and the resistance measuring means is connected to the other end (ie, electrodes Xb ₁ , Xb ₂ ), and the resistance is connected to one end (ie, electrodes Xa ₁ , Xa ₂ ). Connect the measuring means and the other end (ie, electrode X
b ₁ , Xb ₂ ) is alternately switched between the open state and the open state, so that even if two points of the full-surface resistance films 10 and 11 are simultaneously pressed, the side close to any one end of the full-resistance films 10 and 11 Can be obtained respectively.
As for the Y coordinate, similarly to the X coordinate, the switch means is connected to one end of the entire surface resistive films 20 and 21 (that is, the electrode Y).
a ₁ , Ya ₂ ) are opened and the resistance measuring means is connected to the other end (that is, the electrodes Yb ₁ , Yb ₂ ), and the resistance value is connected to one end (ie, the electrodes Ya ₁ , Ya ₂ ). The measuring means is connected and the other end (that is, the electrode Y
b ₁ , Yb ₂ ) are alternately switched between open and closed states, so that even when two points of the full-surface resistance films 20 and 21 are pressed simultaneously, the side closer to one of the ends of the full-resistance films 20 and 21 Can be obtained respectively.
Therefore, the analog type full-surface resistance films 10, 11, 12
It is possible to detect the positions of two points that are simultaneously depressed by using 0 and 21. Even if the operation area, that is, the area of the entire resistive films 10 to 21 becomes larger than that of the digital type, external detection is performed. The circuit pattern for connecting to the circuit does not become large, and the processing time required for detecting the depressed position does not increase, and the processing speed does not decrease.

In this embodiment, the electrodes Xa _{1 to} Xb ₁
The calculation is performed with the resistances Rx ₀ , Rx ₀ ′ between Xa _{2 and} Xb ₂ known, but in order to eliminate errors due to variations in the entire resistance films 10 and 11 and variations in the constant current source 1, In an initial state such as startup, for example, the electrodes Xb ₁ and Xb ₂ are short-circuited, the constant current source 1 and the voltage detecting means 30 are connected between the electrodes Xa ₁ and Xa ₂ ,
_{1 ~Xb 1} and between the electrodes Xa ₂ ～Xb measuring the resistance value of the total of between _2, based on this measurement may be performed the above calculation. Also similarly the Y direction, in the initial state, for example, the electrodes Yb _1, Yb ₂ between short-circuited, by connecting a constant current source 1 and the voltage detecting means 30 between the electrodes Ya _1, Ya _2, electrodes Ya ₁ ~ Between Yb ₁ and electrodes Ya _{2 to} Yb
A total resistance value between the _two may be measured, and the above-described calculation may be performed based on the measured value.

(Embodiment 2) FIG. 3 is a schematic configuration diagram of a resistive film type input device according to this embodiment. In the resistive film type input device according to the first embodiment, two pairs of the entire resistive films are provided. In the present embodiment, a pair of substantially rectangular insulating sheets are arranged to face each other so as to face each other. A resistor is provided on the entire opposing surface to form resistive films 10 and 20 on the entire surface.

Two opposing sides of the four sides of the entire surface resistive film 10
Has electrode Xa₁, Xb₁Are provided, and electrodes are provided on the other two sides.
Ya₁, Yb₁Is provided. The electrode Xa₁,
Xb ₁Are provided on all sides corresponding to the two sides of the overall resistance film 10 provided with
Electrodes Xa are provided on two sides of the sheet resistance film 20, respectively._Two, Xb_TwoBut
Provided, the electrode Ya₁, Yb₁The whole surface resistive film provided with
Each of the two sides of the overall resistance film 20 corresponding to the two sides of
Electrode Ya_Two, Yb_TwoIs provided.

As shown in FIG. 4, the switch means S ₁ is connected to the electrode Xa _1, Xb _1, the electrode Xa _2, Xb ₂ are connected to the switching means S _2. Switch means S
_1, S ₂ are switched by a not-shown CPU, by switching the switching means S _1, S _2, between the electrodes Xa _1, Xa _2, or a constant current source to either one of between the electrodes Xb _1, Xb ₂ 1 and the voltage detecting means 30 are connected, and the other is opened.

For example, switch means S₁, S_TwoSwitching
Thus, the entire surface of the resistive films 10 and 20 are formed on one side
Electrode Xa₁, Xa_TwoA constant current source 1 and a voltage detecting means 3
0 and the electrode Xa₁, Xa_TwoIs formed
Xb formed on the side opposite to the side₁, X
b_TwoAnd the electrode Xa is detected by the voltage detecting means 30.₁, X
a_TwoDetect the voltage generated between them. Where the resistive film
2 points P of 10₁, P_TwoIs pushed down, and the entire surface resistive film 1
0 and 20 are 2 points P₁, P_TwoAt the point P
_TwoPoint P than₁Is the electrode Xa₁, Xa_TwoSo close to
Electrode Xa₁, Xa _TwoThe resistance value between the electrodes Xa₁~ Point P₁
Resistance Rx between₁And electrode Xa_Two~ Point P₁Resistance Rx between₁'
(= Rx₁) And (= 2Rx₁) And the resistance 2Rx
₁Is proportional to the electrode Xa₁, Xa_TwoOccur in between.
Electrode Xa₁~ Xb₁Electrode Xa_Two~ Xb_TwoThe resistance between
Known and each Rx₀Therefore, the voltage detecting means
From the 30 measurements, the resistance Rx₁And (Rx₁/ R
x₀), The depressed point P₁
Can be detected.

Next, the switching means S ₁ , S ₂ are switched to open the electrodes Xa ₁ , Xa ₂ of the entire resistance films 10, 20, and the constant current source 1 and the voltage detection between the entire resistance films 10, 20. The voltage detecting means 30 detects the voltage generated between the electrodes Xb ₁ and Xb ₂ . Here, when the two points P ₁ and P ₂ of the overall resistance film 10 are pushed down and the entire resistance films 10 and 20 conduct at the two points P ₁ and P ₂ , respectively, the point P ₂ is higher than the point P _1. The electrodes Xb ₁ ,
Since it is close to Xb ₂ , the resistance between the electrodes Xb ₁ and Xb ₂ becomes
Resistance Rx ₃ between the electrodes Xb ₁ ~ point P ₂ and the electrodes Xb ₂ ~ point P
The sum is equal to the resistance Rx ₃ ′ (= Rx ₃ ) between the _two (= 2Rx ₃ ), and voltages proportional to the resistance 2Rx ₃ are applied to the electrodes Xb ₁ and Xb.
Occurs between the _two . Therefore, the calculated resistance Rx ₃ from the measured value of the voltage detection unit _{30, {(Rx 0 -Rx 3} ) / Rx
By performing the calculation of the _0}, it is possible to detect the X-coordinate of a point depressed P _2.

In the same manner as described above, the CPU switches the switch means so that the constant current source 1 and the voltage detecting means 30 are provided between the electrodes Ya ₁ and Ya ₂ formed on one side of the entire resistive films 10 and 20.
With connecting and electrodes Ya _1, Ya ₂ electrode Yb ₁ formed on the formed sides and opposite sides, Yb ₂ were opened respectively, electrodes Ya ₁ by the voltage detection means 30, Y
detecting a voltage generated between a _2. Here, the two points P ₁ and P ₂ of the overall resistance film 10 are pushed down, and the overall resistance film 1 is lowered.
If 0,20 conducts each other at two points P _1, P _2, two points P _1, it is the electrode Ya of the point P ₂ than the point P ₁ among the P _2
1 and Ya ₂ , the resistance between the electrodes Ya ₁ and Ya ₂ becomes the resistance Ry ₁ between the electrode Ya ₁ and the point P ₂ and the resistance between the electrodes Ya ₂ and Ya ₂ .
The sum with the resistance Ry ₁ ′ (= Ry ₁ ) between the points P ₂ (= 2R
y ₁ ), and a voltage proportional to the resistance 2Ry ₁ is applied to the electrode Ya.
_1, generated between Ya _2. Between the electrodes Ya ₁ ~Yb _1, the resistance between the electrodes Ya ₂ ~Yb ₂ are known, respectively Ry ₀
Therefore, the resistance Ry _{1 is obtained} from the measured value of the voltage detecting means 30.
Is calculated, and (Ry ₁ / Ry ₀ ) is calculated, whereby
It can be determined Y coordinate of the point P _2.

Next, by switching the switch means, the entire surface resistance is changed.
Electrodes Ya of the anti-films 10 and 20₁, Ya _TwoTo release
And the electrode Yb₁, Yb_TwoConstant current source 1 and voltage detection
The stage 30 is connected, and the electrode Y is detected by the voltage detecting means 30.
b₁, Yb_TwoDetect the voltage generated between them. Where 2
Point P₁, P_TwoWithin the point P_TwoPoint P than₁Is the electrode Yb
₁, Yb_Two, The electrode Yb₁, Yb_TwoResistance value between
Is the electrode Yb₁~ Point P₁Resistance Ry between_ThreeAnd the electrode Yb_Two~
Point P₁Resistance Ry between_Three'(= Ry_Three) And (= 2R
y_Three) And the resistance 2Ry_ThreeIs proportional to the electrode Yb
₁, Yb_TwoOccur in between. Therefore, the voltage detecting means 3
From the measured value of 0, the resistance Ry_ThreeAnd ｛(Ry₀-R
y_Three) / Ry₀By performing the calculation of｝, the point P₁Of Y
The coordinates can be determined.

Thus, the switch means S ₁ , S ₂
Electrodes Xa formed on one side of the entire surface resistive films 10 and 20, respectively.
_1, the electrode with connecting a constant current source 1 and the voltage detecting means 30 between Xa ₂ Xa _1, the sides respectively formed electrodes X of Xa ₂ is a side opposed formed entirely resistive film 10, 20
b ₁ , Xb ₂ are opened, and the entire resistive film 10, Xb ₂ is opened.
By opening the 20 electrodes Xa ₁ and Xa ₂ respectively and alternately switching the state where the constant current source 1 and the voltage detecting means 30 are connected between the electrodes Xb ₁ and Xb ₂ , the entire resistive films 10 and 20 are switched. Even when the points are depressed at the same time, the X coordinate of the point closer to _{one of} the electrodes Xa ₁ , Xa ₂ or the electrodes Xb ₁ , Xb ₂ can be obtained. As for the Y coordinate, similarly to the X coordinate, the switching means connects the constant current source 1 and the voltage detecting means 30 between the electrodes Ya ₁ and Ya ₂ formed on one side of the entire resistive films 10 and 20, respectively. A state in which the electrodes Yb ₁ and Yb ₂ formed on the sides of the entire resistive films 10 and 20 facing the sides on which the electrodes Ya ₁ and Ya ₂ are formed, respectively, is opened, and the electrodes Ya _{1 of the} full resistive films 10 and 20 are opened. , Ya ₂ , respectively, and alternately switching the state in which the constant current source 1 and the voltage detecting means 30 are connected between the electrodes Yb ₁ , Yb ₂ , thereby simultaneously pressing down the two points of the entire resistive films 10, 20. The electrodes Ya ₁ and Ya ₂ or the electrodes Yb
The Y coordinate of a point closer to either ₁ or Yb ₂ can be obtained. Therefore, it is possible to detect the positions of two points that are simultaneously depressed using the analog type full-surface resistive films 10 and 20, and the digital type can be compared with the digital type.
Even if the operation area increases, the circuit pattern for connecting to an external detection circuit does not increase, and the processing speed does not decrease. Also, compared to the first embodiment,
The resistance film type input device can be realized by the two full-surface resistance films 10 and 20, and the number of the whole-surface resistance films can be reduced, and the cost can be reduced.

In this embodiment, the electrodes Xa _{1 to} Xb ₁
The calculation is performed with the resistances Rx ₀ and Rx ₀ ′ between Xa _{2 and} Xb ₂ being known, but in order to eliminate errors due to variations in the entire resistance films 10 and 20 and variations in the constant current source 1, in the initial state, such as during start-up, for example, electrodes Xb _1, Xb ₂ between short-circuited to detect the constant current source 1 and the voltage detecting means 30 between the electrodes Xa _1, Xa _2, electrodes Xa ₁
The total resistance between the electrodes Xa ₁ and Xa ₂ and the electrodes Xa _{2 and} Xb ₂ may be measured, and the above-described calculation may be performed based on the measured values. Similarly, in the Y direction, in the initial state, for example, the electrodes Yb ₁ and Yb ₂ are short-circuited and the electrodes Yb ₁ and Yb ₂ are short-circuited.
a _1, Ya detects a constant current source 1 and the voltage detecting means 30 between ₂ and between the electrodes Ya ₁ ～Yb ₁ and electrode Ya ₂ ～Yb resistance value of the total of between ₂ were measured, based on this measurement value The above calculation may be performed.

[0032]

As described above, according to the first aspect of the present invention, a pair of full resistance films which are disposed opposite to each other and are electrically connected to each other at a depressed portion, and which are respectively connected to both ends of the pair of full resistance films. Switch means, and resistance measuring means connected to one end of the pair of full-surface resistance films via the switch means and measuring a resistance value between the ends. A state in which one end of the resistive film is opened and the resistance measuring means is connected between the other ends, and a state in which the resistance measuring means is connected between one end of the pair of entire resistive films and the other end is connected. Are alternately switched to open states, and even when two points on the entire resistance film are simultaneously pushed down, the resistance measurement means is proportional to the position of the point on the side closer to the end of the resistance film connected thereto. Detecting resistance value Since the position of the point depressed can be obtained from the resistance value, by alternately switching the end to which the resistance measuring means is connected, the two points simultaneously depressed by the analog type resistive film type input device can be obtained. There is an effect that the position of a point can be detected. Moreover, even if the area of the entire resistive film increases, the pattern for connecting the resistive film to an external detection circuit does not increase or the processing speed does not decrease as in the digital type. There is an effect that a high-speed resistive film type input device can be realized.

According to a second aspect of the present invention, the entire surface resistive film is formed in a substantially rectangular shape, and two sets of a pair of full surface resistive films arranged so as to face each other are provided. 2
An electrode to which the switch means is connected is formed on each side, and an electrode to which the switch means is connected is formed on two opposite sides of the other set of the entire surface resistive film substantially orthogonal to the two sides. Claim 1
Similarly to the invention of the third aspect, by alternately switching the electrodes connected to the resistance measuring means, there is an effect that the positions of two points which are simultaneously depressed can be detected.

According to a third aspect of the present invention, there is provided a pair of substantially rectangular full-surface resistance films which are opposed to each other with their sides aligned and which are electrically connected to each other at a depressed portion, and four end portions of the pair of full-surface resistance films. And a resistance measuring means connected between the one ends of the pair of full-surface resistance films via the switching means, and measuring a resistance value between the ends, wherein the switching means is A state in which one of the opposite ends of the pair of full-surface resistance films is opened and the resistance measuring means is connected between the other ends, and a state in which one of the opposite ends of the pair of full-surface resistance films is connected. The state where the resistance measuring means is connected and the state where the other end is opened are alternately switched. Even when two points of the entire resistance film are simultaneously pushed down, the side close to the end to which the resistance measuring means is connected is connected. Proportional to the position of the point The resistance value can be detected, and the position of the depressed point can be obtained from the resistance value. Therefore, by alternately switching the end to which the resistance measuring means is connected, the analog resistance film type input device can be obtained. Thus, there is an effect that the positions of the two points pressed down at the same time can be detected. Moreover, even if the area of the entire resistive film increases, the pattern for connecting the resistive film to an external detection circuit does not increase or the processing speed does not decrease as in the digital type. There is an effect that a high-speed resistive film type input device can be realized.

According to a fourth aspect of the present invention, electrodes to which switch means are respectively connected are formed on four sides of the entire surface resistive film, and the switch means is provided on one side of two opposing sides of the pair of overall resistive films. The electrodes formed on the other side are opened and the resistance measuring means is connected between the electrodes formed on the other side, and the electrodes formed on one side of two opposite sides of the pair of full-surface resistance films. A state in which the resistance measuring means is connected therebetween and the state in which the electrodes formed on the other side are respectively opened are alternately switched. Similarly to the invention of claim 3, by switching the electrode connecting the resistance measuring means. There is an effect that the positions of two points that are simultaneously pushed down can be detected.

According to a fifth aspect of the present invention, a pair of full-surface resistive films are disposed opposite to each other so as to be electrically connected to each other at a portion where the resistive film is depressed.
One end of each of the pair of full-surface resistance films is opened via switching means, and resistance measurement means is connected between the other ends of the pair of full-surface resistance films via switching means, and the pair of full-surface resistance films is connected. After measuring the resistance value between the other ends of the resistive film, a resistance measuring means is connected between one ends of the pair of overall resistive films via a switch means, and the other of the pair of overall resistive films is connected. Are opened through switch means, and the resistance between the other ends of the pair of overall resistance films is measured to detect the positions of two points depressed from the two resistances. Therefore, even when two points on the entire surface resistive film are simultaneously pressed down, the resistance measuring means can detect a resistance value proportional to the position of a point closer to the end of the connected entire surface resistive film. Find the position of the point depressed from the resistance value Since it is Rukoto, by switching the end of the entire resistive film connected to resistance measuring means alternately, there is an effect that can detect the position of the two points that are simultaneously depressed by the resistance film type input device of analog.

According to a sixth aspect of the present invention, a pair of substantially rectangular full-surface resistive films are disposed so as to be opposed to each other so as to be electrically connected to each other at a depressed portion, and electrodes are respectively provided on four sides of the pair of general-purpose resistive films. Are formed, and the electrodes formed on one of the two opposite sides of the pair of full-surface resistive films are opened via the switch means, and the switch means is provided between the electrodes formed on the other side via the switch means. After measuring the resistance value between the electrodes by connecting the resistance measuring means, the resistance measuring means is connected via a switching means between the electrodes formed on one of two opposing sides of the pair of overall resistive films. At the same time, the electrodes formed on the other side are opened via switch means, and the resistance between the electrodes is measured to detect the positions of the two points depressed from the two resistances. And the two points of the overall resistive film are Even when the resistance is lowered, the resistance measuring means can detect a resistance value proportional to the position of the point closer to the connected electrode, and the position of the depressed point can be obtained from the resistance value. By alternately switching the electrodes connected to the resistance measuring means, there is an effect that the positions of two points simultaneously depressed by the analog resistive film type input device can be detected.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a resistive film type input device according to a first embodiment.

FIG. 2 is a circuit diagram illustrating the operation of the above.

FIG. 3 is a schematic configuration diagram illustrating a resistive film type input device according to a second embodiment.

FIG. 4 is a circuit diagram illustrating an operation of the above.

FIG. 5 is a schematic configuration diagram showing a conventional resistive film type input device.

FIG. 6 is a circuit diagram illustrating the operation of the above.

FIG. 7 is an explanatory diagram illustrating an operation at the time of two-point pressing in the above.

FIG. 8 is a circuit diagram illustrating an operation at the time of two-point pressing in the above.

[Explanation of symbols]

10,11 entirely resistive film P _1, P ₂ points Rx _1, Rx ₃ resistance _{Xa 1, Xa 2, Xb 1} , Xb 2 electrode

Continuing on the front page (72) Inventor Kyosuke Iribe 1048 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Works, Ltd.

Claims (6)

[Claims] 1. A pair of full-surface resistance films which are arranged opposite to each other and are electrically connected to each other at a depressed portion, and switch means respectively connected to both ends of the pair of full-surface resistance films;
A resistance measuring means connected to one end of the pair of full-surface resistance films via a switch means, and measuring a resistance value between the ends, wherein the switch means comprises one of the pair of full-resistance films. A state in which the ends are opened and the resistance measuring means is connected between the other ends, and a state in which the resistance measuring means is connected between one ends of the pair of full-surface resistance films and the other ends are opened respectively. And a resistance film type input device characterized by alternately switching between (a) and (b). 2. The whole-surface resistance film is formed in a substantially rectangular shape, and two sets of a pair of whole-surface resistance films disposed so as to face each other with their sides aligned are provided.
Electrodes to which the switch means are respectively connected are formed on two opposing sides of one set of full-resistance films, and a switch is formed on two opposing sides of the other set of full-resistance films that are substantially orthogonal to the two sides. 2. The resistive film input device according to claim 1, wherein said means is connected to each of said electrodes. 3. The display device according to claim 1, wherein said plurality of sides are opposed to each other.
A pair of substantially rectangular full-surface resistance films that are conductive to each other at the depressed portion, switch means respectively connected to four ends of the pair of full-resistance films, and one end of the pair of full-resistance films. A resistance measuring unit connected via switch means for measuring a resistance value between the ends, wherein the switch means opens one of the opposite ends of the pair of full-surface resistance films and opens the other end. The state in which the resistance measuring means is connected between the parts and the state in which the resistance measuring means is connected between one end of the pair of opposed resistive films and the other end is opened are alternately switched. A resistive film type input device. 4. An electrode connected to a switch means on each of four sides of the entire surface resistive film, wherein the switch means comprises an electrode formed on one of two opposite sides of a pair of the entire resistive films. Are opened, and the resistance measuring means is connected between the electrodes formed on the other side, and the resistance measuring means is connected between the electrodes formed on one of the two opposing sides of the pair of overall resistive films. And alternately switching between a state of opening the electrodes formed on the other side and a state of opening the electrodes formed on the other side, respectively. 5. A pair of full-surface resistive films are opposed to each other so as to be electrically connected to each other at a depressed portion, and one end of each of the pair of full-surface resistive films is opened via a switch means. A resistance measuring means is connected between the other ends of the resistive films via a switch means, and after measuring a resistance value between the other ends of the pair of overall resistive films, one of the pair of overall resistive films is measured. While connecting the resistance measuring means through the switch means between the ends, the other end of the pair of full-surface resistive films are respectively opened through the switch means,
Measuring the resistance value between the other ends of the pair of overall resistance films to detect the positions of two points depressed from the two resistance values; Method. 6. A pair of substantially rectangular resistive films are arranged so that their sides are opposed to each other so as to be electrically connected to each other at a portion where the pair of substantially rectangular resistive films are pushed down. The electrodes formed on one of the two opposing sides of the entire surface resistive film are opened via switching means, and the resistance measuring means is provided between the electrodes formed on the other side via switching means. After connecting and measuring the resistance value between the electrodes, the resistance measurement means is connected via a switch means between the electrodes formed on one of two opposite sides of the pair of full-surface resistance films, and the other is connected. The electrodes formed on the sides are opened through switch means, the resistance between the electrodes is measured, and the positions of two points depressed from the two resistances are detected. A method for detecting the position of a resistive input device.