JPH03244485A - Touch sensor - Google Patents

Abstract

PURPOSE:To have good performance of sensing the contacting condition with human body to such a degree as not requiring any variable resistor for adjustment of sensitivity by furnishing a sensing means which senses whether contacting is made with a human body on the basis of voltage variation in a capacitor resulting from movement of electric charges to the capacitor. CONSTITUTION:When a human body 4 capacity Cex is in contact with the terminal 5 of a touch sensor, electric changes charged on the human body 4 capacity Cex at turning-on of a switch 3 will move to a capacitor 7Co via the touch sensor terminal 5, an impedance circuit 6, and the switch 3, to be stored in the capacitor 7Co. This movement of electric charges will be repeated with turning-on of the switch 3 in accordance with the oscillation frequency of a pulse circuit 2 as long as the human body capacity Cex is in connection with the sensor terminal 5, to boost the voltage at the end of the capacitor 7. Measuring the voltage at the end of capacitor 7 using an appropriate voltage judging means allows sensing whether the touch sensor terminal 5 is touched by the human body 4 with a high sensitivity.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a touch sensor that detects a contact/non-contact state of a human body, etc., and specifically relates to a touch sensor for detecting a contact/non-contact state of a human body, etc. The present invention relates to a touch sensor for controlling a ball launcher by detecting whether or not a player is in contact with a player.

[Prior Art] Various pachinko gaming machines are installed in pachinko gaming machines, which play games by firing game balls using a ball firing device that is activated by a player's operation of an operation dial.

The batted ball firing device is operated by an operation dial operated by a player, and the operation dial has a touch plate that detects whether or not the player is grasping the operation dial based on whether or not the player's hand is in contact with the operation dial. A sensor is installed. When the player rotates the touch plate without touching it, the touch sensor is turned on and the ball firing device is activated.

As a conventional touch sensor having this type of touch plate, for example, one is known that utilizes the phenomenon of charging the capacitance of the human body and detects changes in the capacitance. Specifically, an oscillation circuit is provided inside, the oscillation circuit is caused to oscillate, and when a human body or the like comes into contact with the touch plate connected to the oscillation circuit, the balance of the oscillation is disrupted and the oscillation is stopped. The contact/non-contact state of the human body is detected based on the presence or absence of the contact.

[Problems to be Solved by the Invention] However, the conventional touch sensor described above is configured to detect the state of contact with the human body by using the phenomenon of charging the capacitance of the human body. Since the transient charging phenomenon is used, potential changes due to the capacitance of the human body are small, and the detection sensitivity in principle is not necessarily high. Therefore, a predetermined volume (amplifier gain adjustment, etc.) is required to adjust the detection sensitivity, and there are problems in terms of cost and time required to adjust the volume. There was a problem to be solved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a touch sensor that can detect the contact state of a human body well to the extent that a volume for sensitivity adjustment is not required.

[Means for Achieving the Object] In order to achieve the above object, the present touch sensor includes an oscillating means that oscillates a signal of a predetermined frequency, a switch that is switched in response to the signal, and the oscillating means and the switch. and a touch sensor terminal that is connected to the touch sensor terminal and can be contacted by a human body, etc., and a charge that is connected to the touch sensor terminal via the switch and that is transferred from the human body, etc. when the human body, etc. contacts the touch sensor terminal. The device is configured to include a capacitor that stores a charge, and a detection means that detects whether there is contact with a human body or the like based on a change in the voltage of the capacitor due to the movement of charge to the capacitor.

[Operation] If the touch sensor terminal is not touched by a human body, no electric charge is charged from the touch sensor terminal to the capacitor even when the switch is turned on, and if the touch sensor terminal is not touched by a human body, etc. In some cases, when the switch is turned on, the charge held by the human body, etc. moves repeatedly to the capacitor via the touch sensor terminal and the switch, increasing the voltage at the end of the capacitor, and based on the voltage change, the charge of the human body, etc. Since the presence or absence of contact is detected, it is possible to obtain a large potential difference by repeatedly accumulating the charge stored in the human body, etc., and the detection sensitivity can be significantly increased. It can be made unnecessary.

[Example] Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a diagram for explaining the present invention in detail. In the conventional example, changes in the capacitance of the human body are detected by using the charging phenomenon, but the detection principle of the present invention is that it uses the discharging phenomenon of the electric charge charged in the human body. are completely different.

To explain specifically using FIG. 1, 1 is a touch determination circuit (touch sensor) that is built into the touch handle control device and determines whether or not a human body has touched the touch plate of the operation dial. The touch determination circuit l includes an oscillation circuit (oscillation means) 2 that oscillates a signal of a predetermined frequency, a switch 3 that is turned on when the signal oscillated by the oscillation circuit 2 is at low level (L level), and For example, a resistor R, .
R, an impedance circuit 6 consisting of a diode D,
The capacitor 7 (C0) is connected to the other end of the switch 3 to which the impedance circuit 6 is connected, and stores the charge accumulated in the capacitance (Cex) 4 of the human body. In this case, the pulse signal oscillated by the oscillation circuit 2 is applied to the switch 3 via the impedance circuit 6, and the touch sensor terminal 5, which can be touched by the human body 4, is provided on the output side of the switch 3 via the switch 3. Connected to capacitor 7 (C0).

According to such a configuration, the human body 4 is connected to the touch sensor terminal 5.
When there is no capacitance (Cex) (that is, when the player is not in contact with the touch handle), the potential of the touch sensor terminal 5 changes when the switch 3, which turns on/off in synchronization with the pulse signal, is turned on. Since C8 is at L level, capacitor 7 (C8) is not charged and becomes OV.

Then, the capacitance (Cex) of the human body 4 is connected to the touch sensor terminal 5.
When the switch 3 is turned on, the capacitance of the human body 4 (
Cex) is charged to the touch sensor terminal 5,
It moves to capacitor 7 (C,) through impedance circuit 6 and switch 3, and is stored in capacitor 7 (C0). This charge movement is the capacitance of the human body 4 (Cex)
As long as C is connected to the sensor terminal 5, this is repeated as the switch 3 is turned on in accordance with the oscillation frequency of the pulse circuit 2, increasing the voltage at the end of the capacitor 7 (C,). Next, the capacitor 7 is determined using an appropriate voltage determination means.
By measuring the voltage at the end, presence or absence of contact with the touch sensor terminal 5 of the human body 4 can be detected with high sensitivity.

Next, a touch sensor based on the above principle will be described as an example.

FIGS. 2 to 4 are diagrams showing an embodiment of the touch sensor according to the present invention, with FIG. 2 showing its block diagram, FIG. 3 its circuit diagram, and FIG. 4 showing each part. A voltage waveform diagram of each measurement point is shown.

The touch handle control device 11, as shown in FIG.
A rectifier circuit 12 that rectifies 24 V AC supplied to the control device 11 into DC, and a rectified output (input voltage) rectified into DC and a set voltage that is stably constant against fluctuations in load (for example, 12V), and a power supply confirmation circuit 1 that confirms that the rectifier circuit 12 and the constant voltage circuit 13 are operating normally and a predetermined power is being supplied.
4, an oscillation circuit (oscillation means) 15 that internally oscillates a predetermined frequency, and touch input detection that detects whether a human body has touched the touch plate (touch sensor terminal) 16 based on the output of the oscillation circuit 15. A touch determination circuit (touch sensor) 18 that includes a circuit 17 and determines whether there is a human body contact.
, a driver 19 that amplifies the output level of the touch determination circuit 18 to a level sufficient to drive an output relay circuit 21 (described later), and a relay operation confirmation circuit that confirms that the driver 19 operates and the relay operation is normal. 20 and
The output relay circuit 21 opens and closes a power supply path for power supplied to a motor for firing a batted ball based on the output of a touch input determination circuit 18 driven by a driver 19. The touch input detection circuit 17 includes a high voltage input protection circuit 22 for protecting internal circuit elements when a high voltage is applied from the touch plate 16.
is installed. Further, the output relay circuit 21 is provided with a back electromotive voltage protection circuit 23 for preventing the internal circuit from being destroyed by the back electromotive force generated in the coil when the output relay is turned off.

FIG. 3 shows a circuit diagram of the touch handle control device 11.

As shown in the figure, the touch handle control device 11 includes the above-mentioned circuits, that is, a rectifier circuit 12 and a constant voltage circuit 1.
3. Equipped with a power supply confirmation circuit 14, an oscillation circuit 15, a touch input detection circuit 17, a driver 19, a relay operation confirmation circuit 2o, and an output relay circuit 21, and external power output terminals 31 and 32 for driving a motor, and a power supply terminal for supplying power. Power input terminal 33
．． 34 and an external terminal 35 to which the touch plate 16 is connected.

The rectifier circuit 12 is connected to a low voltage AC power source (for example, 24cm
) is used to rectify the AC 24V supplied from the power input terminals 33, 34 connected to the It is composed of a capacitor CI + for the power supply and a capacitor C1 for absorbing surges and removing high frequencies.

The constant voltage circuit 13 is for stably supplying a constant voltage (for example, 12V) against load fluctuations and input voltage fluctuations, and is for example used to improve the transient characteristics of the three-terminal regulator 41 and output changes. Capacitor for CI 8
It consists of

The output voltage (DC
12V) is supplied to the oscillation circuit 15 and the touch input detection circuit 17 via a power supply confirmation circuit 14 consisting of a light emitting diode 51 and a resistor Rl1. The light emitting diode 51 emits light when a predetermined voltage is output from the constant voltage circuit 13 to confirm the power supply state.

The oscillation circuit 15 has a predetermined oscillation frequency (for example, 14
．． 8KHz) signal and outputs a pulse signal based on the oscillation to the subsequent touch input detection circuit 17. Specifically, the Schmitt trigger 61, capacitor C
a Schmitt trigger oscillator 62 consisting of a resistor R3, a Schmitt trigger 63 that shapes the output of the oscillator 62 into a pulse signal, a transistor Tr,
, R1It R, , R14 and a transistor switch section 64 consisting of a speed-up capacitor Cll.

The collector of the transistor Tr is connected to the input side of the touch input detection circuit 17 as the output of the oscillation circuit 15. The touch input detection circuit 17 has a switch function that responds to a pulse signal generated by the oscillation of the Schmitt trigger oscillator 62 and turns on when the pulse signal is at L level, and an output capacitor that stores the charge of the capacitance (Cex) of the human body. Specifically, it has a switching PNP transistor (switch) Tr, an output capacitor C, a diode Dll, a resistor Ral to R1, and a Schmitt trigger 71. 72, and the touch input detection circuit 17 includes protection diodes D, . . . D8. A high voltage input protection circuit 22 consisting of the following is inserted. Also,
The three-terminal regulator 41 supplies a constant output voltage.
The terminal end of the output terminal of is grounded via a capacitor CM+. In addition, the diode DN1, the capacitor Csx, and the resistors Rm1 to R14 correspond to the impedance circuit 6 shown in FIG. This is a circuit for turning on/off. Further, the collector of the transistor Tr (that is, the output side of the oscillation circuit 15) is connected to a resistor R1 and a diode D.
.

It is connected to the emitter of a PNP transistor Tr for switching through a resistor R1, and a resistor Rs for input protection is connected between this diode D1 and a resistor R0.
A touch plate 16 that can be contacted by the human body is connected via a capacitor Csa for cutting off a DC component and an external terminal 35. Further, the PNP transistor Tr,
An output capacitor C0 is connected to the collector of the capacitor C0, and the output capacitor C0 is transferred from the human body through the touch plate 16, the external terminal 35, the capacitor C13, the resistor Rsat Ram, and the PNP transistor Tr due to the ON operation of the PNP transistor Tr. Stores electric charge. Further, the collector of the PNP transistor Tr is connected to the driver circuit 19 through a resistor Rsv and a Schmitt trigger 71, 72, and the output capacitor C0 is charged with electric charge, increasing the collector potential of the transistor Tr. Then, a transistor Tr (described later) inside the driver circuit 19 is turned on.

The Schmitt triggers 71 and 72 are inserted for waveform shaping of the output signal. Further, a resistor R having a relatively large resistance value is connected in parallel with the output capacitor C0.
, , are connected, and when no electric charge is supplied from the human body and the output to the driver circuit 19 decreases and the transistor Tr, which will be described later, is turned off, a current flows into the closed loop consisting of the output capacitor C0 and the resistor R3. The charge in the current output capacitor C is properly discharged.

The driver circuit 19 drives the output signal of the touch input detection circuit 17 based on the collector potential of the transistor Tr3 to a magnitude sufficient to drive an output relay 92 (described later) of the output relay circuit 21. ,
It is composed of a medium power transistor Tr and a resistor R41.

The output relay circuit 21 driven by the rectified power supply of the rectifier diode D I l l D + 1 is connected to the collector side of the transistor Tr,
The relay operation of the output relay circuit 21 is performed by the light emitting diode 8.
Relay operation confirmation circuit 20 consisting of 1 and resistor Rl
Confirmed by.

The output relay circuit 21 is for opening and closing the power supply path to the batted ball firing motor (not shown) in response to the judgment result of the touch judgment circuit 18. When 91 is turned off and energized (when energized)
It is composed of an output relay 92 that turns on a switch 91 when the switch 91 is turned on.

Further, a back electromotive force protection circuit 23 consisting of a diode D4 is provided in parallel with the output relay 92, and a back electromotive voltage generated when the output relay 92 is turned off by the back electromotive voltage protection circuit 23 causes a transistor Tr, etc. destruction is prevented.

Next, the effect will be explained.

The AC 24V supplied to the input terminals 33 and 34 of the touch handle control device 11 as a power source is rectified into DC by the rectifier circuit 12 and then input to the constant voltage circuit 13 . The constant voltage circuit 13 always maintains a constant set voltage (for example, 12 V) against fluctuations in the rectified output and load input to the constant voltage circuit 13 and applies it to the touch determination circuit 18 in the subsequent stage.
At the same time, its operation is confirmed by the power supply confirmation circuit 14.

In the oscillation circuit 15, a predetermined frequency (for example, 14.
8KHz) signal is oscillated. The oscillation frequency signal generated by this Schmitt trigger in the oscillation section 62 is waveform-shaped into a pulse signal close to a square wave by the next Schmitt trigger 63, and then sent to the transistor switch section which becomes the output stage of the oscillation circuit 15. 64.

The waveform-shaped oscillation frequency signal is input as a pulse signal to the base of the transistor Tr via the resistor R8 of the transistor switch section 64, and the transistor Tr changes depending on the input level.

A predetermined potential appears at the collector of the transistor Tr (see point A in FIG. 3) by turning on/off the transistor Tr. As a result, the pulse signal is transmitted to the PNP transistor Tr, which serves as a switch.
The signal is amplified to a magnitude sufficient to turn on/off the signal and is output to the touch input detection circuit 17. Specifically, when the oscillation frequency is at a high level (H level), a voltage inverted to L level by the Schmitt trigger 63 is applied to the base of the transistor Tr. Therefore,
The transistor Tr is turned off and no voltage drop occurs across the resistor Rlm, and the collector potential of the transistor Tr (ie, the output of the oscillation circuit 15) becomes H level (approximately 12 V in this case). Furthermore, when the oscillation frequency is at L level, a voltage inverted to H level by the Schmitt trigger 63 is applied to the base of transistor Tr, turning on transistor Tr and its collector potential being at L level (in this case, It becomes approximately O■). In this way, an output voltage corresponding to the frequency signal oscillated by the oscillation section 62 appears at the collector of the transistor Tr. Note that the potential level of the collector potential of this transistor Tr does not change depending on whether or not there is a touch.

The output of the oscillation circuit 15 is input to the emitter of the PNP transistor Tr through the resistor R31, the diode D1, and the resistor R3 of the touch input detection circuit 17, while the output is input to the emitter of the PNP transistor Tr through the resistor Rl l and the capacitor Cs m.
P is input to the base of transistor Tr. Therefore, when the oscillation frequency is at H level and the output of the oscillation circuit 15 is at H level, the PNP transistor Tr,
Since an H level voltage is applied to the base of the transistor Tr.

is turned off, and the oscillation circuit 15 side and the subsequent output capacitor C0 side are electrically disconnected. On the other hand, when the oscillation frequency is at L level, the output of the oscillation circuit 15 is at L level.
When the voltage is at the oscillation circuit 15 side, an L level voltage is applied to the base of the PNP transistor Tr, which turns on the oscillation circuit 15 side and the output capacitor C.
It is electrically connected to the 0 side. In other words, only when the oscillation frequency is at L level, the PNP transistor T
r is turned on, and the oscillation circuit 15 and the output capacitor C0 are connected.

An external terminal is connected between the oscillation circuit 15 and the output capacitor C1 (in this embodiment, the stage before the resistor R connected to the emitter of the transistor Tr) (see point B in Fig. 3), which has the above-mentioned connection relationship. 35. Capacitor C for DC cut
A touch plate 16 that can be touched by a human body is connected through a protective resistor R1 and a protective resistor R1, and the following operations are performed depending on whether or not a human body touches this touch plate 16.

The case where the human body is not in contact with the touch plate 16 (that is, the electric charge charged to the human body is not applied to the external terminal 35) is equivalent to the case where the touch plate 16 is not connected to the touch input detection circuit 17. At this time, the potential at point B in Figure 3 is as shown in Figure 4 (B).
“No T.

Indicated by ucr-r. Figure 4 (B) "No T.

As shown in "UCH", when the human body is not connected to the touch plate 16, the waveform has approximately the same potential difference as the output waveform of the oscillation circuit 15 (see FIG. 4(A)). When the human body is not in contact with the touch plate 16, the output of the oscillation circuit 15 is at H level and the PNP transistor Tr is off, and when the output of the oscillation circuit 15 is at L level, the transistor Tr is turned on and the touch plate 16 Even when the path leading to ~transistor Tr and ~output capacitor C0 is closed, the touch plate 16
Since no electric charge is applied to the capacitor C1, the capacitor C1 is not charged by discharge from the human body. In other words, the transistor Tr serving as a switch is turned on only when the pulse signal oscillated by the oscillation circuit 15 is at L level.
When the pulse signal is at H level, the transistor Tr,
Since the output capacitor C0 is also turned off, the potential level of the output capacitor C0 shown at point C in FIG. 3 is kept at a low potential (approximately 3 V) (see FIG. 4(C)).

On the other hand, when the human body is in contact with the touch plate 16 (that is, when the electric charge charged to the human body is applied to the external terminal 35), the potential at point B in FIG. 3 is as shown in FIG. 4 (B). As shown in "T OU CH", the potential of the L level increases and the potential difference between the H level and the L level becomes smaller, resulting in a state where oscillation occurs near the H level. Therefore, when the output of the oscillation circuit 15 shifts from the H level to the L level and the transistor Tr is turned on, the charges accumulated in the human body are transferred from the touch plate 16 to the transistor Tr.

The signal is transferred to the output capacitor C0 via the output capacitor C0, and is stored in the output capacitor C0. This charge movement is caused by the transistor T
As a result, the potential level of the output capacitor C0 portion shown at point C in Figure 3 rises to a high potential (approximately 7 cm) (see Figure 4 (C)). The potential level at the 0 point changes depending on the oscillation frequency of the oscillation circuit 15, and the higher the oscillation frequency, the more accumulation of charges in the output capacitor C0 due to repeated movement of charges increases, so the potential level increases quickly. Therefore, by increasing the oscillation frequency of the oscillation circuit 15, a detection output with a large dynamic range can be obtained, and detection accuracy can be further improved.

After the voltage shown at point C in FIG. That is, in the case of "No TOUCH", the voltage applied to the transistor Tr is low, so the transistor Tr is turned off, and therefore the output relay 92 of the output relay circuit 21 is stopped (
demagnetized).

As a result, the switch 91 interlocked with the output relay 92 is turned off, the power supply path for the motor for firing the ball is opened, and the operation of the motor is stopped. Also, “T OU
CH", a high voltage is applied to the transistor Tr, so the transistor Tr is turned on, and the output relay 92 is energized (excited).

As a result, the switch 91 is turned on, the power supply path for the motor is closed, and the motor is ready for operation.

The touch sensor 18 according to this embodiment, as described above,
an oscillation circuit 15 that oscillates a signal at a predetermined oscillation frequency;
a transistor Tr that is switched in response to a signal of the oscillation frequency; the oscillation circuit 15; and the transistor T.
r, and a touch plate 16 that can be contacted by the human body, and a capacitor C0 that is connected to the touch plate 16 via the transistor Tr and stores electric charge transferred from the human body. The capacitor C is switched by switching the transistor Tr according to the oscillation frequency, and the charge is transferred from the human body to the capacitor C0 when the human body contacts the touch plate 16.
Since the configuration is such that the presence or absence of human body contact is detected based on the voltage change of There is no charge to C0, and when a human body touches the touch plate 16, the touch plate 16 and the transistor Tr are turned on due to the on operation of the transistor Tr.
The electric charge held by the human body repeatedly moves to the capacitor C through , increasing the voltage at the end of the capacitor C0, and based on the voltage change, the presence or absence of contact with the human body is detected.
By repeatedly accumulating electric charges in the human body, a large potential difference can be obtained, the detection sensitivity can be significantly increased, and a volume or the like for sensitivity adjustment can be made unnecessary.

In addition, in the above description, an example was shown in which the touch determination circuit (touch sensor) 18 according to the present invention is applied to a touch handle control device 11 that performs control by detecting whether or not a player is touching an operation dial. However, it is not limited to this,
It is applicable to anything that attempts to detect the contact state of a human body (or an object with low capacitance). For example, a touch plate may be attached to a door handle or the like and used as a touch sensor that determines whether a person enters a room based on the presence or absence of contact.

Further, although an example has been shown in which the touch determination circuit (touch sensor) 18 is installed in the handle control device 11, it may be installed in the batted ball launching device, and is not limited to this, and can be installed in various devices of a pachinko game machine. It may be installed or may be attached as a single unit.

Further, although an oscillation circuit using a Schmitt trigger is used as an example of the oscillation means, any oscillation means may be used as long as it oscillates a predetermined oscillation frequency signal, such as a multi-stage inverter. An oscillation circuit using
A C oscillation circuit, a crystal oscillation circuit, etc. may also be used.

Furthermore, although a PNP transistor is used as an example of the switch, the switch is not limited to a transistor as long as it can be switched in accordance with the oscillation frequency of the oscillation means. Furthermore, since this embodiment uses a switch (PNP transistor) that is turned on when the oscillation of the oscillation means is at L level, the circuit configuration itself can be made simple, but the point is that the oscillation Any switch may be used as long as it can switch the connection between the touch plate and the capacitor in accordance with the frequency.

[Effects of the Invention] The touch sensor according to the present invention includes an oscillating means for oscillating a signal of a predetermined frequency as described above, a switch that is switched in response to the signal, and a structure between the oscillating means and the switch. a touch sensor terminal that is connected to the touch sensor terminal and can be contacted by a human body, etc., and a capacitor that is connected to the touch sensor terminal via the switch and stores electric charge transferred from the human body, etc. when the human body, etc. contacts the touch sensor terminal. ,
Since the configuration includes a detection means for detecting the presence or absence of contact with a human body, etc. based on the voltage change of the capacitor due to the movement of charge to the capacitor, the switch is activated when the touch sensor terminal is not touched by a human body, etc. Even when the touch sensor terminal is turned on, there is no charge from the touch sensor terminal to the capacitor, and if the touch sensor terminal is touched by a human body, the touch sensor terminal and the switch are turned on. The charge held by the human body, etc. moves repeatedly to the capacitor via the capacitor, increasing the voltage at the end of the capacitor, and based on the voltage change, the presence or absence of contact with the human body, etc. is detected, so the charge stored in the human body, etc. By repeatedly accumulating , a large potential difference can be obtained, the detection sensitivity can be greatly increased, and a volume etc. for sensitivity adjustment can be made unnecessary.

[Brief explanation of drawings]

Fig. 1 is a principle explanatory diagram for explaining the present invention in detail, Figs. 2 to 4 show embodiments of the invention, and Fig. 2 shows a touch handle control having a touch sensor. FIG. 3 is a block diagram of the device; FIG. 3 is a circuit diagram of a touch handle control device having a touch sensor; FIG. 4 is a voltage waveform diagram at measurement points of each part of the circuit of the touch handle control device. 1... Touch determination circuit (touch sensor), 2...
・Oscillation circuit (oscillation means), 3... switch, 4...
... human body, 5... touch sensor terminal, 7... capacitor, 11... touch handle control device, 15...
... Oscillation circuit (oscillation means), 16 ... Touch plate (touch sensor terminal), 17 ... Touch input detection circuit, 18 ... Touch judgment circuit (touch sensor)
, Tr,...PNP transistor (switch), C
0...Output capacitor (capacitor). Figure 2 3 Figure

Claims (1)

[Claims] an oscillating means for oscillating a signal of a predetermined frequency; a switch that is switched in response to the signal; a touch sensor terminal that is connected between the oscillating means and the switch and can be contacted by a human body; a capacitor connected to the touch sensor terminal via the touch sensor terminal and storing charge transferred from the human body etc. when the human body etc. contacts the touch sensor terminal, and a voltage change of the capacitor due to the transfer of charge to the capacitor. A touch sensor comprising a detection means for detecting the presence or absence of contact with a human body or the like.