JP6308528B2 - Capacitive input device - Google Patents

Description

  The present invention relates to an input device, and more particularly to an electrostatic capacitance type input device that performs an input operation by bringing a plurality of operating bodies into contact with or close to an operation surface.

  In recent years, as an input device such as a touch pad of a notebook PC or a touch panel of a portable information terminal called a tablet PC or a smartphone, it has a plurality of detection electrodes and capacitance detection means connected to them, and comes into contact with the operation surface. Alternatively, a capacitance-type input device that detects an input operation on an operation surface based on a change in capacitance caused by an operation body such as a fingertip of an adjacent operator is widely used.

  In recent years, a technique called multi-touch operation has been put into practical use in which a plurality of operating bodies are brought into contact with the operation surface of such a capacitive input device to perform an input operation. As a technique related to the multi-touch operation in the capacitive input device, Patent Document 1 and the like are disclosed. FIG. 8 is an explanatory diagram relating to the configuration of a conventional capacitive input device, and shows the configuration of the information processing apparatus 100 according to Patent Document 1 and a touch panel display 108 to which the information processing apparatus 100 is connected.

  As illustrated in FIG. 8, the information processing apparatus 100 includes a detection unit 111, a first acquisition unit 112, a holding unit 113, a determination unit 114, a second acquisition unit 115, a determination unit 116, a pinch control unit 117, and display control. Part 118 and storage part 119. The information processing apparatus 100 is connected to a touch panel display 108 having a capacitive touch panel (input device) and a display device (output device) such as a liquid crystal display via a system bus or an interface. .

  The touch panel display 108 detects a touch point that is a point where a user's fingertip or the like (operation body) comes into contact. When the touch panel display 108 detects a touch point, information about the touch point (such as the position of the touch point and the time when the touch is detected) is notified from the touch panel display 108 to the information processing apparatus 100.

  The detection unit 111 analyzes information on the touch point notified from the touch panel display 108. The 1st acquisition part 112 makes the holding part 113 hold | maintain the information which shows the position of the detected touch point, and the time when the touch was detected for every touch point. The determination unit 114 determines whether the position information of the detected touch point has been updated.

  The second acquisition unit 115 calculates the distance between the two points and the amount of change in the distance between the two points based on the information acquired by the first acquisition unit 112 when there are two or more touch points. doing. The determination unit 116 determines the operation content (such as a pinch operation) based on the information calculated by the second acquisition unit 115.

  The pinch control unit 117 performs control corresponding to a pinch operation (an operation for changing the interval between two fingertips). The display control unit 118 controls the touch panel display 108 to display a predetermined image based on the operation content determined by the determination unit 116. The storage unit 119 stores information related to the display image.

JP 2013-178636 A

  As a method of detecting an input to the operation surface in such a capacitance type input device, a method of setting a threshold value related to the amount of change in capacitance and detecting the input based on the set threshold value is common. is there. However, when an input operation is performed by bringing a plurality of operating bodies into contact with or in proximity to the operating surface, when an operating body (for example, an index finger) is brought into contact with the operating surface to perform the first input, There were cases where other operating bodies (other fingers, etc.) were close to the operating surface. Also, when the operating environment changes due to the operator touching a metal member placed near the operating surface and performing an operation, the capacitance may change as the operating environment changes. There was sex.

  For this reason, if the operating tool is brought close to the operating surface against the intention in a state where the operating environment has changed, the capacitance changes due to the change in the operating environment, and the operation close to the operating surface is made against the intention. There was a possibility that a change in capacitance due to the body was erroneously detected as the second input. On the other hand, if the threshold value is set too large in order to suppress such erroneous detection, there is a possibility that an input made intentionally becomes a detection failure. In addition, there is a possibility that an input operation unintended by the operator may be executed due to such erroneous detection of input or detection omission.

  The present invention has been made in view of such a situation of the prior art, and an object thereof is to perform an unintended input operation when an operation is performed by bringing a plurality of operating bodies into contact with or close to the operation surface. An object of the present invention is to provide a capacitance type input device capable of suppressing the above.

In order to solve this problem, the capacitance-type input device according to claim 1 is configured such that an operation surface that is touched or approached by an operating body and a capacitance that accompanies the contact or proximity of the operating body to the operating surface. a capacitance detection unit that detects a change, an electrostatic capacitive input device and a determination unit for determining the contents of the multi-touch operation based on the change of the electrostatic capacity detection unit has detected, The determination unit sets a first threshold value related to a change amount of capacitance detected by the capacitance detection unit, and the capacitance detection unit sets a first threshold value where the change amount of capacitance exceeds the first threshold value. And detecting that the first input in the multi-touch operation has been made, and setting a second threshold value greater than the first threshold value based on the amount of change in the first change, State in which the capacitance detection unit detects the first change In addition, when the capacitance variation detected the second change exceeding the second threshold value, and judging a second input of the multi-touch operation is performed.

  With this type of capacitance-type input device, even if there is a change in the operating environment, when multiple inputs are made in the same operating environment, the amount of change in the capacitance corresponding to those inputs is comparable. It is easy to become. Therefore, by setting a second threshold value that is larger than the first threshold value based on the amount of change in capacitance in the first change, and detecting the second input based on the second threshold value, Even when there is a change, it is possible to prevent a change in capacitance due to the operating body close to the operation surface from being unintentionally erroneously detected as the second input. In addition, the second threshold value can be optimized by setting the second threshold value based on the change amount of the capacitance in the first change, and the second threshold value can be prevented from becoming excessively large. And thereby, it can prevent that the 2nd input made intentionally becomes detection failure. As a result, when an input operation is performed by bringing a plurality of operating bodies into contact with or close to the operation surface, it is possible to prevent an unintended input operation from being performed.

  The capacitance-type input device according to claim 2, wherein the determination unit detects a change amount in the first change and the second change when the capacitance detection unit detects the second change. The second threshold value is reset based on the larger change amount of the change amounts in the change.

  In the capacitance-type input device having this configuration, the second change based on the larger change amount of the change amount of the capacitance in the first change and the change amount of the capacitance in the second change. By resetting the threshold value, the second threshold value can be optimized even when the operating environment changes after the second threshold value is set. And it can suppress further that unintended input operation is performed by detecting a 2nd input based on the optimized 2nd threshold value.

  The capacitance type input device according to claim 3, wherein when the capacitance detection unit detects a plurality of the second changes, the determination unit includes a change amount in the first change and a plurality of change amounts. The second threshold value is reset based on the larger change amount of the maximum change amount in the second change.

  In the capacitance-type input device having this configuration, the larger change amount of the change amount of the capacitance in the first change and the maximum change amount of the capacitance in the plurality of second changes. By resetting the second threshold value based on the second threshold value, the second threshold value can be optimized even when the operating environment changes during the detection of the plurality of second inputs. And it can suppress further that unintended input operation is performed by detecting a 2nd input based on the optimized 2nd threshold value.

  The capacitance-type input device according to claim 4, wherein the determination unit sets the second threshold value so as to be a value between 50% and 90% of a reference change amount. .

  In the capacitance-type input device having this configuration, by setting the second threshold value to 50% or more of the reference variation amount, the capacitance change due to the operation body that is intentionally brought into contact with or close to the operation surface can be obtained. Thus, it is possible to easily distinguish the change in capacitance due to the operation body close to the operation surface against the intention. And it can make it easy to prevent that the change of the electrostatic capacitance by the operation body which adjoined the operation surface contrary to the intention is erroneously detected as the second input. In addition, by setting the second threshold value to 90% or less of the reference change amount, the change amount of the capacitance corresponding to the second input intentionally made is smaller than the reference change amount. Even in the case of variation, it is possible to easily prevent the second input made intentionally from becoming a detection failure. As a result, it is possible to further suppress execution of an unintended input operation.

  According to the present invention, it is possible to provide a capacitance type input device capable of suppressing an unintended input operation from being performed when an operation is performed by bringing a plurality of operating bodies into contact with or close to the operation surface. Can do.

It is explanatory drawing which shows the structure of the electrostatic capacitance type input device which concerns on embodiment of this invention. It is explanatory drawing which shows the laminated structure of the operation panel which concerns on embodiment of this invention. It is explanatory drawing which shows the usage example of the electrostatic capacitance type input device which concerns on embodiment of this invention. It is explanatory drawing regarding input operation which concerns on embodiment of this invention. It is explanatory drawing regarding the detection method of the input which concerns on embodiment of this invention. It is explanatory drawing which shows the example of a change of the electrostatic capacitance which concerns on embodiment of this invention. It is a flowchart which shows the detection procedure of the input which concerns on embodiment of this invention. It is explanatory drawing regarding the structure of the conventional electrostatic capacitance type input device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the directions in each figure will be described with X1 on the left, X2 on the right, Y1 on the front, Y2 on the back, Z1 on the top, and Z2 on the bottom.

  First, the configuration of the input device 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is an explanatory diagram illustrating a configuration of a capacitive input device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a laminated structure of the operation panel according to the embodiment of the present invention. FIG. 3 is an explanatory diagram showing an example of use of the capacitive input device according to the embodiment of the present invention. FIG. 4 is an explanatory diagram regarding an input operation according to the embodiment of the present invention. 4A is an explanatory diagram relating to a normal operation, FIG. 4B is a first explanatory diagram relating to a multi-touch operation, and FIG. 4C is a second explanatory diagram relating to a multi-touch operation. It is.

  As shown in FIG. 3, the input device 1 according to the embodiment of the present invention is a capacitive input device such as a touch pad used in an electronic device 80 such as a notebook PC. As shown in FIG. 1, the input device 1 includes an operation panel 10, a plurality of detection electrodes 20, a changeover switch unit 30, a signal generation unit 40, a capacitance detection unit 50, a determination unit 60, And a control unit 70.

  As shown in FIG. 3, the operation panel 10 is a plate-like member attached to a metal frame portion 81 such as a palm rest of the electronic device 80. As shown in FIG. 2, the operation panel 10 is formed by laminating a first electrode forming layer L1 and a second electrode forming layer L2 on which the detection electrode 20 is formed, vertically with an insulating layer or the like not shown. Is done. A protective layer Lp is formed on the operation panel 10, and the surface of the protective layer Lp serves as an operation surface 11 that receives an input operation. When performing an input operation on the input device 1, as shown in FIG. 4, the operator performs an input operation by bringing an operating body 90 such as a fingertip into contact with or close to the operation surface 11.

  As illustrated in FIG. 2, the detection electrode 20 includes a plurality of first detection electrodes 21 and a plurality of second detection electrodes 22. The first detection electrodes 21 are substantially rectangular electrodes extending in the front-rear direction, and are arranged in parallel on the first electrode formation layer L1 of the operation panel 10 at equal intervals along the left-right direction. The second detection electrodes 22 are substantially rectangular electrodes extending in the left-right direction, and are arranged side by side at equal intervals along the front-rear direction on the second electrode formation layer L2 of the operation panel 10.

  The changeover switch unit 30 is a circuit having a plurality of switch elements capable of switching connections. As shown in FIG. 1, a plurality of first detection electrodes 21, a plurality of second detection electrodes 22, a signal generation unit 40, and a capacitance detection unit 50 are connected to the changeover switch unit 30. The changeover switch unit 30 includes a predetermined first detection electrode 21 of the plurality of first detection electrodes 21 connected to the signal generation unit 40, and a predetermined first of the plurality of second detection electrodes 22. 2 The connection state is switched so that the detection electrode 22 is connected to the capacitance detection unit 50.

  The signal generating unit 40 generates an alternating current electric signal for driving (hereinafter abbreviated as a driving signal), and applies the generated driving signal to the first detection electrode 21 connected to itself.

  The capacitance detection unit 50 detects an electrical signal transmitted from the first detection electrode 21 to the second detection electrode 22 corresponding to the drive signal. Then, based on the detected electrical signal, the capacitance detection unit 50 includes a first detection electrode 21 to which the signal generation unit 40 is connected and a second detection electrode 22 to which the capacitance detection unit 50 is connected. The capacitance generated during the period and the change of the capacitance with time are detected. Hereinafter, description will be given with the electrostatic capacitance between the first detection electrode 21 and the second detection electrode 22 detected by the electrostatic capacitance detection unit 50 as the electrostatic capacitance Cs.

  The determination unit 60 detects an input (hereinafter, abbreviated as an input) performed by bringing the operating body 90 into contact with or close to the operation surface 11 based on the change in the capacitance Cs detected by the capacitance detection unit 50. A position on the operation surface 11 (hereinafter, abbreviated as an operation position) where the operation body 90 is brought into contact with or close to the operation body 90 is detected, and what input operation is performed based on the detected operation position and the change in the operation position ( Hereinafter, the operation content is abbreviated.

  The control unit 70 controls the changeover switch unit 30, the signal generation unit 40, the capacitance detection unit 50, and the determination unit 60. In addition, the control unit 70 is connected to an external circuit on the electronic device 80 side (not shown), acquires information regarding the operation content determined by the determination unit 60 and transmits the acquired information to the external circuit.

  Next, an input operation according to the embodiment of the present invention will be described. As illustrated in FIG. 4, the input device 1 corresponds to a normal operation and a multi-touch operation. As shown in FIG. 4A, the normal operation is an operation performed by bringing one operating body 90 (for example, an index finger) close to or in contact with the operation surface 11. The operation body 90 may be slid in a predetermined direction while being close to or in contact with the operation surface 11. The multi-touch operation is an operation such as a pinch operation or a swipe operation performed by bringing a plurality of operation bodies 90 into contact with the operation surface 11. As shown in FIG. 4B, the pinch operation is an operation for changing the interval between a plurality of operation bodies 90 (for example, index finger and thumb) brought into contact with the operation surface 11. As shown in FIG. 4C, the swipe operation is an operation of moving a plurality of operation bodies 90 (for example, index finger and middle finger) in contact with the operation surface 11 in the same direction.

In order to cope with such a multi-touch operation, the determination unit 60 detects and detects an input corresponding to each operation body 90 when each of the operation bodies 90 is brought into contact with the operation surface 11. The operation position corresponding to each input is detected. In the following description, the first input made intentionally in the multi-touch operation is set as the first input, and the description will proceed with the change in the capacitance Cs caused by the first input as the first change. Furthermore, the intention to have been made input after the first input as a second input, the description will change in capacitance Cs of the second input as the second change. There may be a plurality of second inputs.

  Next, an input detection method according to an embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an explanatory diagram relating to an input detection method according to the embodiment of the present invention. FIG. 5A schematically shows the state of the operation panel 10 when the operation body 90 is not in contact with or close to the operation surface 11, and FIG. 5B shows the operation body 90 in contact with the operation surface 11. FIG. 5C schematically shows the state of the operation panel 10 when the operating body 90 is brought close to the operation surface 11.

  FIG. 6 is an explanatory diagram illustrating an example of a change in capacitance according to the embodiment of the present invention. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the amount of change ΔC in capacitance. FIG. 6A shows an example of change in the capacitance Cs in a normal operating environment. A solid line A1 indicates a change in the capacitance Cs from a state where the operating body 90 is not in contact with or close to the operating surface 11 to a state where the operating body 90 is intentionally brought into contact with the operating surface 11. A chain line A2 indicates a change in the capacitance Cs from a state where the operating body 90 is not in contact with or close to the operating surface 11 to a state where the operating body 90 is close to the operating surface 11 unintentionally. FIG. 6B shows a change example of the capacitance Cs in an operation environment different from normal. A solid line A3 indicates a change in the capacitance Cs from a state in which the operating body 90 is not in contact with or close to the operating surface 11 to a state in which the operating body 90 is in contact with the operating surface 11 intentionally. A chain line A4 indicates a change in the capacitance Cs from a state where the operating body 90 is not in contact with or close to the operating surface 11 to a state where the operating body 90 is close to the operating surface 11 unintentionally.

  As described above, the determination unit 60 detects an input based on a change in the capacitance Cs detected by the capacitance detection unit 50. As shown in FIG. 5, when the operating body 90 is brought into contact with or close to the operation surface 11, the first detection electrode 21 and the second detection electrode 22 corresponding to the positions at which the operating body 90 is brought into contact or close to. The capacitance Cs between and changes. Such a change in the capacitance Cs occurs even when the operating body 90 is intentionally brought into contact with or close to the operating body 90, or when the operating body 90 is approached against the intention. However, the amount of change in the capacitance Cs increases as the distance between the operation body 90 and the operation surface 11 decreases. When the operating body 90 is intentionally brought into contact with or close to the operating body 90, the distance between the operating body 90 and the operating surface 11 is likely to be close. And the operation surface 11 are likely to be long. As a result, when the operating body 90 is intentionally brought into contact or close, the amount of change in the capacitance Cs tends to be large, and when the operating body 90 is close to the intention, the capacitance Cs is changed. The amount of change tends to be small.

  Therefore, as shown in FIG. 6A, the first threshold value Th1 relating to the amount of change in the capacitance Cs is set, and the operating body 90 is intentionally brought into contact or proximity based on the first threshold value Th1. It is possible to identify whether the capacitance Cs has changed or whether the capacitance Cs has changed due to the proximity of the operating body 90 against the intention. In the present embodiment, the determination unit 60 sets the first threshold Th1 in advance, and the capacitance detection unit 50 detects the change in which the change amount of the capacitance Cs exceeds the first threshold Th1. Is determined to have been entered. Such an input detection method is used for detection of an input in a normal operation and detection of a first input in a multi-touch operation.

  When performing a multi-touch operation, when one operation body 90 is brought into contact with the operation surface 11 to perform a first input, another operation body 90 approaches the operation surface 11 unintentionally. There are cases. As described above, even when the operating body 90 is close to the operation surface 11 against the intention, the capacitance Cs changes. Moreover, the capacitance Cs may vary depending on the operating environment. For example, in an operating environment in which an operator performs an input operation by touching a part of the operating body 90 (such as an operator's palm) to the metal frame 81 on the electronic device 80 side, the detection electrode 20 and the operating body 90 May be electrically coupled (capacitive coupling or the like) through the metal frame portion 81, and the capacitance Cs may vary accordingly.

  In such an operating environment, as shown in FIG. 6B, even when the operating body 90 is close to the operating surface 11 against the intention, the static operation by the operating body 90 close to the operating surface 11 is avoided. The change in the capacitance Cs accompanying the change in the operating environment is added to the change in the capacitance Cs, and the amount of change in the capacitance Cs may exceed the first threshold Th1. On the other hand, in the multi-touch operation, even if there is such a change in the operation environment, when a plurality of inputs are performed in the same operation environment, the amount of change in the capacitance Cs corresponding to each input is approximately the same. It is easy to become. That is, the change amount of the capacitance Cs in the first change is likely to be approximately the same as the change amount of the capacitance Cs in the second change.

  Therefore, as shown in FIG. 6B, a second threshold value Th2 larger than the first threshold value Th1 is set based on the change amount of the capacitance Cs in the first change, and based on the second threshold value Th2. By detecting the input, even if there is a change in the operating environment, it is possible to prevent a change in the capacitance Cs caused by the operating body 90 close to the operating surface 11 from being unintentionally detected as an input. Can do. In the present embodiment, the determination unit 60 sets the second threshold value Th2 after the capacitance detection unit 50 detects the first change, and then the capacitance detection unit 50 detects the first change. In addition, when the second change in which the amount of change in the capacitance Cs exceeds the second threshold Th2 is detected, it is determined that the intended second input has been made.

  Next, a method for setting the first threshold Th1 and the second threshold Th2 will be described. Since the first threshold Th1 is used for detection of an input in a normal operation and detection of a first input in a multi-touch operation, the input can be detected even when the operating body 90 is brought close to the operation surface 11. It is desirable to set a relatively small value with respect to the amount of change in the capacitance Cs serving as a reference. In the present embodiment, the first threshold Th1 is set to be about 30% of the amount of change in the capacitance Cs in the first change.

  The first threshold Th1 may be set in advance based on an assumed value of the change amount of the capacitance Cs in the first change, or may be set to the actual change amount of the capacitance Cs in the first change. Although it may be set based on this, in the present embodiment, the first threshold Th1 is set in advance based on the assumed value of the change amount of the capacitance Cs in the first change.

  Since the second threshold value Th2 is set after detecting the first change, it is set based on the actual change amount of the capacitance Cs in the first change. The second threshold Th2 is a value obtained by adding the variation width of the change amount of the capacitance Cs in the second change to the first threshold Th1 and the fluctuation width of the capacitance Cs accompanying a change in the operating environment. Is preferably set as a large value. On the other hand, when the second threshold value Th2 is set too large, the change is made when the change amount of the capacitance Cs in the second change is slightly smaller than the change amount of the reference capacitance Cs. There is a possibility that the second input will be missed. Therefore, it is desirable to set the second threshold Th2 as a value smaller than a value obtained by subtracting the variation width of the change amount of the capacitance Cs in the second change from the change amount of the reference capacitance Cs.

  The variation width of the change amount of the capacitance Cs in the second change may be about 10% of the change amount of the reference capacitance Cs. In addition, the fluctuation range of the capacitance Cs accompanying the change in the operating environment may be about 10% of the change amount of the reference capacitance Cs. Therefore, in the present embodiment, the second threshold Th2 is set to be a value from 50% to 90% of the amount of change in the reference capacitance Cs.

  In order to appropriately cope with a change in the operating environment, when a new input having a change amount of the capacitance Cs larger than the change amount of the reference capacitance Cs is detected, the second threshold Th2 is detected. It is desirable to appropriately review the criteria for setting the value and optimize the second threshold Th2. In the present embodiment, when the second input is detected after the second threshold Th2 is set, the second threshold Th2 is the amount of change in the capacitance Cs1 in the first change and the second change in the second change. It is reset based on the larger change amount of the change amount of the capacitance Cs. In addition, when a plurality of second inputs are detected after the second threshold Th2 is set, the second threshold Th2 is the amount of change in the capacitance Cs in the first change and the plurality of second inputs. It is reset based on the larger change amount of the maximum change amount of the capacitance Cs in the change.

  Next, an input detection procedure according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing an input detection procedure according to the embodiment of the present invention. In FIG. 7, the first threshold Th1 is set in advance.

  As shown in FIG. 7, first, in step S1, the capacitance detection unit 50 detects a change in the capacitance Cs. In step S2, the determination unit 60 detects the first input based on the first threshold Th1. In step S3, the control unit 70 makes a determination based on the presence or absence of the first input. If it is determined in step S3 that there is no first input, the process returns to step S1 and the procedure from step S1 is repeated. If it is determined in step S3 that the first input is present, the process moves to step S4.

  Next, in step S4, the determination unit 60 detects an operation position corresponding to the first input. In step S5, the determination unit 60 sets the second threshold Th2 based on the change amount of the capacitance Cs in the first change. Next, in step S6, the determination unit 60 detects the second input based on the second threshold Th2. In step S7, the control unit 70 makes a determination based on the presence / absence of the second input. If it is determined in step S7 that there is no second input, the process moves to step S10. If it is determined in step S7 that the second input is present, the process moves to step S8.

  Next, in step S8, the determination unit 60 detects an operation position corresponding to the second input. In step S9, the determination unit 60 determines the first change based on the larger change amount of the change amount of the capacitance Cs1 in the first change and the change amount of the capacitance Cs in the second change. 2 Reset the threshold Th2. When a plurality of second inputs are detected, the determination unit 60 determines the maximum amount of change in the capacitance Cs in the first change and the change amount in the capacitance Cs in the plurality of second changes. The second threshold value Th2 is reset based on the larger change amount.

  Next, in step S10, the determination unit 60 determines the operation content based on the operation position corresponding to the first input and the operation position corresponding to the second input. Then, information regarding the operation content is transmitted to the external circuit. Next, in step S11, the control unit 70 determines whether or not to continue detection. In step S11, when continuing detection, it returns to step S1 and repeats the procedure after step S1. In step S11, when the detection is not continued, the control unit 70 ends the detection according to a predetermined procedure. After that, the detection such as the second threshold Th2 may be initialized and the detection may be resumed. In the present embodiment, the input device 1 detects input according to such a procedure.

  Next, the effect of this embodiment will be described. The input device 1 according to the present embodiment is compatible with a multi-touch operation in which a plurality of operation bodies 90 are brought into contact with the operation surface 11 to perform an input operation. In the multi-touch operation, even if there is a change in the operation environment, when a plurality of inputs are performed in the same operation environment, the amount of change in the capacitance Cs corresponding to these inputs tends to be approximately the same. Therefore, by setting the second threshold Th2 larger than the first threshold Th1 based on the change amount of the capacitance Cs in the first change, and detecting the second input based on the second threshold Th2. Even when there is a change in the operation environment, it is possible to prevent a change in the capacitance Cs caused by the operation body 90 close to the operation surface 11 from being unintentionally detected as a second input. In addition, the second threshold value Th2 is optimized by setting the second threshold value Th2 based on the change amount of the capacitance Cs in the first change, thereby preventing the second threshold value Th2 from becoming excessively large. it can. And thereby, it can prevent that the 2nd input made intentionally becomes detection failure. As a result, it is possible to suppress an unintended input operation from being performed when an input operation is performed by bringing the operation surface 11 into contact with the operation surface 11.

  In the input device 1 of the present embodiment, the change in the capacitance Cs due to the operation body 90 intentionally brought close to the operation surface 11 and the capacitance due to the operation body 90 close to the operation surface 11 against the intention. When the change in Cs can be reliably identified, the input operation may be performed by bringing the plurality of operation bodies 90 close to the operation surface 11. In such a case, even when an input operation is performed with a plurality of operation bodies 90 being close to the operation surface 11, the same effect as when an input operation is performed with the plurality of operation bodies 90 in contact with the operation surface 11 is obtained. Can be obtained.

  Further, in the input device 1 of the present embodiment, when the second input is detected after the second threshold Th2 is set, the determination unit 60 determines the amount of change in the capacitance Cs in the first change. The second threshold Th2 is reset based on the larger change amount of the change amount of the capacitance Cs in the second change. Therefore, even when the operating environment changes after the second threshold Th2 is set, the second threshold Th2 can be optimized. Then, by detecting the second input based on the optimized second threshold Th2, it is possible to further suppress an unintended input operation from being performed.

  In the input device 1 according to the present embodiment, when the determination unit 60 detects a plurality of second changes corresponding to the plurality of second inputs, the change in the capacitance Cs in the first change. The second threshold Th2 is reset based on the larger change amount of the amount and the maximum change amount of the capacitance Cs in the plurality of second changes. Therefore, even when the operating environment changes in the middle of detecting a plurality of second inputs, the second threshold value Th2 can be optimized. Then, by detecting the second input based on the optimized second threshold Th2, it is possible to further suppress an unintended input operation from being performed.

  Further, in the input device 1 of the present embodiment, the capacitance by the operating body 90 that is intentionally brought into contact with or close to the operation surface 11 by setting the second threshold Th2 to 50% or more of the reference change amount. It is possible to easily identify the change in Cs and the change in the capacitance Cs caused by the operation body 90 close to the operation surface 11 against the intention. And it can make it easy to prevent that the change of the electrostatic capacitance Cs by the operation body 90 which adjoined the operation surface 11 contrary to the intention is misdetected as a 2nd input. In addition, by setting the second threshold Th2 to 90% or less of the reference change amount, the change amount of the capacitance Cs corresponding to the second input that is intentionally made is smaller than the reference change amount. Therefore, even if the input is slightly smaller, it is possible to easily prevent the second input made intentionally from becoming a detection failure. As a result, it is possible to further suppress execution of an unintended input operation.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to said embodiment, In the range which does not deviate from the objective of this invention, it can change suitably.

  For example, in the embodiment of the present invention, the input device 1 may be used for purposes other than those described above. For example, the input device 1 may be used for a touch panel such as a tablet PC or a smartphone, an input device for a game machine, an input device for an in-vehicle electronic device, or other applications.

  In the embodiment of the present invention, the detection electrode 20 may have an arrangement or shape other than those described above. For example, the first detection electrode 21 may be formed on the second electrode formation layer L2, and the second detection electrode 22 may be formed on the first electrode formation layer L1. The first detection electrodes 21 may be arranged in parallel along a direction other than the left-right direction, and the second detection electrodes 22 may be arranged in parallel along a direction other than the front-rear direction.

DESCRIPTION OF SYMBOLS 1 Input device 10 Operation panel 11 Operation surface 20 Detection electrode 21 1st detection electrode 22 2nd detection electrode 30 Changeover switch part 40 Signal generation part 50 Capacitance detection part 60 Determination part 70 Control part

Claims (4)

An operation surface that the operating body comes into contact with or close to, and
A capacitance detection unit that detects a change in capacitance due to contact or proximity of the operating body to the operation surface;
A determining unit content of the multi-touch operation based on the change of the electrostatic capacity detection unit has detected,
A capacitive input device comprising:
The determination unit
Setting a first threshold for the amount of change in capacitance detected by the capacitance detector;
If the amount of change before Kisei capacity detects the first change exceeding the first threshold value,
While determining that the first input in the multi-touch operation has been made,
Based on the amount of change in the first change, a second threshold value that is larger than the first threshold value is set,
In addition to the state in which the capacitance detection unit detects the first change, when detecting a second change in which the amount of change in capacitance exceeds the second threshold,
It is determined that the second input in the multi-touch operation is made, and the capacitance type input device. The determination unit
When the capacitance detection unit detects the second change,
Of the amount of change in the first change and the amount of change in the second change,
The second threshold is reset based on the larger change amount,
The capacitive input device according to claim 1. The determination unit
When the capacitance detection unit detects a plurality of the second changes,
Of the amount of change in the first change and the maximum value of the amount of change in the plurality of second changes,
The second threshold is reset based on the larger change amount,
The capacitive input device according to claim 2. The determination unit
To be a value from 60% to 90% of the standard change amount,
The second threshold value is set,
The electrostatic capacitance type input device according to any one of claims 1 to 3.