JP2007075581A - Electrostatic capacity sensor for household appliance and vacuum cleaner provided with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic capacity sensor comprising an electrode for detecting an electrostatic capacity change of a user and a detection circuit for transforming the change detected by the electrode into an electric signal and a vacuum cleaner provided with the sensor. <P>SOLUTION: The electrostatic capacity sensor for a household appliance comprises the electrode 10 for detecting the electrostatic capacity change of the user and the detection circuit 20 for transforming the change detected by the electrode 10 into the electric signal. The vacuum cleaner incorporating the sensor is provided with a blower 3, a floor nozzle 7, a handle part 5, an extension pipe 6 and a detection means for detecting user's gripping state. The detection means comprises the electrode 10 provided on both of the handle part 5 and the extension pipe 6 or on either one and for detecting the electrostatic capacity change of the user and the detection circuit 20 for transforming the change detected by the electrode 10 into the electric signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a capacitive sensing device for home appliances that can detect whether or not a handle attached to the home appliance is being held by a human hand, and a vacuum cleaner including the same.

  In the conventional vacuum cleaner, a mechanical switch mechanism is provided in the grip portion of the handle portion to control operation and stop of the vacuum cleaner. In such a vacuum cleaner, a dust collecting chamber and an electric blower are provided in the cleaner body, one end of the hose is connected to the dust collecting chamber in the cleaner body, and the other end is connected to the handle portion. The extension pipe has one end connected to the handle portion and the other end connected to the floor nozzle. The handle portion has an in-handle pipe that allows dust from the extension pipe to pass to the hose side, and a grip portion is formed so as to be separated from the in-handle pipe, and a grip lever is provided in the grip portion. When the person grips the grip part, the grip lever moves, the lever switch arranged in the grip part turns on, and when the person does not grip the grip part, the grip lever returns to the original position, and the lever switch Turned off.

  The user of the electric vacuum cleaner grips the grip portion by hand and moves the floor nozzle through the extension pipe. At this time, the lever switch is turned on by gripping the grip lever of the grip portion, and the vacuum cleaner performs a suction operation. When it is desired to stop the operation of the vacuum cleaner, the grip lever of the grip portion may be released, the lever switch is turned off, and the suction operation of the vacuum cleaner is stopped. The operation of the vacuum cleaner can also be started and stopped by operating the on / off switch of the hand operating unit provided on the handle unit.

  In this way, if you want to move what was on the floor and clean it under cleaning, for example, press the off switch on the hand control unit to stop the operation, move the handle away from the hand and move the thing on the floor A series of operations are required to hold the handle again, press the on / off switch of the hand operating unit to start operation, and clean the place to be cleaned (see, for example, Patent Document 1).

JP 2001-252229 A (page 8-9, FIG. 4)

  According to the vacuum cleaner according to Patent Document 1, when detecting whether or not the user is gripping the grip portion of the vacuum cleaner, the detection range is limited only to a predetermined range of the grip portion, If the user's gripping method is constrained and user-friendliness is poor, or if the child is operating, or when cleaning a small part or gap with a short extension pipe, the detection is not possible. In addition to being unable to do so, it is difficult to operate the hand control unit, and thus a detection method capable of arbitrarily setting a range for detecting human grip is required.

The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a capacitive sensing device for home appliances that can easily detect whether or not it is grasped by a human hand. Objective.
In addition, the present invention can arbitrarily set the range of grip detection by a human hand to the handle portion, the grip portion, and the extension pipe, and is provided with detection means capable of grip detection in various gripping situations. The purpose of the present invention is to obtain an easy-to-use electric vacuum cleaner that can reduce the cleaning time without waste.

  A capacitance sensing device for home appliances according to the present invention comprises an electrode for detecting a change in capacitance of a person and a detection circuit for converting the change in capacitance detected by the electrode into an electric signal. It is.

  In addition, a vacuum cleaner equipped with a capacitive sensing device for home appliances includes an electric blower that sucks dust, a floor nozzle on which the suction force of the electric blower acts, and a handle for moving the floor nozzle Part, an extension pipe provided between the handle part and the floor nozzle, and a detection means for detecting a gripping state by a person, and the detection means is provided in both or one of the handle part and the extension pipe. And an electrode that detects a change in capacitance of a person and a detection circuit that converts the change in capacitance detected by the electrode into an electric signal.

  According to the capacitive sensing device for home appliances according to the present invention, the capacitance changes by being grasped by a human hand, and this change can be detected. Thus, it is possible to easily detect whether or not a person has touched.

  In addition, according to the vacuum cleaner according to the present invention, it is possible to easily set a detection range other than a predetermined range such as the grip portion, and to expand the range in which the operation can be stopped by the presence or absence of gripping, It can be set freely. In addition, since the shutdown operation is not performed by a mechanical switch, there are no moving parts, and repeated repeated use reduces mechanical fatigue, breakage of the force transmission path due to vibration and impact, and breaks down for a long time. Can be used without any sound during operation. Furthermore, the electrodes that detect changes in capacitance can detect human grip even when covered with a dielectric material such as plastic, so the appearance design can be determined freely, and dust It does not invade and is hard to break.

Embodiment 1 FIG.
1 is a perspective view of a vacuum cleaner according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a handle portion of the vacuum cleaner shown in FIG.
The vacuum cleaner main body 1 of such a vacuum cleaner is provided with a dust collection chamber 2 in the front of the interior and an electric blower 3 in the rear. The hose 4 has one end connected to the dust collection chamber 2 in the cleaner body 1 and the other end connected to the handle portion 5. The extension pipe 6 has one end connected to the handle portion 5 and the other end connected to the floor nozzle 7. The handle portion 5 has a handle inner pipe 5a that allows dust from the extension pipe 6 to pass to the hose 4 side, and a grip portion 5b is formed so as to be separated from the handle inner pipe 5a. Is provided with a grip lever 5c.

  The handle portion 5 is provided with an electrode 10 for capacitance detection. The electrode 10 includes a first electrode portion 10a, a second electrode portion 10b, and a third electrode portion 10c. . The first electrode part 10a is installed from the front upper part of the handle part 5 to the rear upper part of the grip part 5b, and the second electrode part 10b is passed from the rear lower part of the grip part 5b through the base part of the grip part 5b to the handle part. 5, the third electrode portion 10 c is installed from the lower front part of the handle part 5 to the lower rear part of the handle part 5. A detection circuit 20 for converting the capacitance change of the electrode 10 into a change in voltage value is provided near the base inside the grip portion 5b, and the first, second, and third electrode portions 10a, 10b, 10 c and the detection circuit 20 are connected by a connection line 30.

  Next, the operation will be described. When the user of the vacuum cleaner performs cleaning, the grip part 5b provided on the handle part 5 is gripped, and the floor nozzle 7 connected via the extension pipe 6 is moved to a place where it is desired to be cleaned. Suction. At this time, since the capacitance detecting electrode 10 is installed in the grip portion 5b, the capacitance of the electrode 10 when the person is not grasping and when grasping is changed. The electrode 10 is connected to the detection circuit 20 via the connection line 30, and the detection circuit 20 outputs a voltage value corresponding to the change in the capacitance of the electrode 10. Since the voltage value differs between when the person grips the grip portion 5b and when the person does not grip it, it is possible to control whether the vacuum cleaner operates by providing an arbitrary threshold value and determining whether or not it is gripped.

A change in capacitance due to a person's grip will be described with reference to FIG. FIG. 3 shows a case where, for example, plate electrodes having an area S are arranged in parallel with a distance D1. 3 (a) or 3 (c) shows the case where there is air between the parallel plate electrodes 40a and 40b, and FIG. 3 (b) or (d) shows that the dielectric corresponding to a human hand is between the parallel plate electrodes 40a and 40b. Indicates the case where it exists. In this case, the capacitance C between the electrodes is expressed by the following equation.
C = E0 × Er × S / D = E × S / D (1)
Where C is the capacitance (F), E0 is the dielectric constant of vacuum (F / meter), Er is the relative dielectric constant of the object between the two electrodes, S is the electrode area (square meter), and D is the distance between the electrodes ( M) and E indicate the dielectric constant (F / meter) of the object between the two poles, and there is a relationship of E = E0 × Er.

In FIG. 3 (a) or (c), it is known that the space between the parallel plate electrodes 40a and 40b is air, and the relative permittivity of air is about 1, and the capacitance is determined from the equation (1). On the other hand, the relative dielectric constant of the object 41 between the parallel plate electrodes 40a and 40b in FIG. 3B or FIG. 3D is about 80 for water, for example, and the object 41 is inserted between the parallel plate electrodes 40a and 40b. As a result, the dielectric constant increases and the capacitance C increases. The relative dielectric constant of a person is about 50 to 60, and the capacitance C greatly changes when inserted between parallel plate electrodes, as in the case of water. Also in the electrode 10 of the actual handle portion 5, when the person is not gripping, that is, when the person is gripping, that is, having a relative dielectric constant larger than that of air, compared to when there is air between the electrodes 10. When C is present instead of air, the capacitance C increases. Therefore, if a value corresponding to the capacitance of the electrode 10 is measured, it can be detected whether or not a person has grasped the vicinity of the electrode.
Here, the parallel plate electrode has been described as an example, but one electrode may be a ground (earth) at infinity, and the shape of the detection electrode may be a flat plate, a wire shape, a thin substrate pattern, Even if it is in the form of a metal block or plating, even if there is a plastic having a low relative dielectric constant between the detection electrode and another electrode, it is possible to detect gripping by a person.

  Next, a capacitance detection method will be described with reference to FIG. In FIG. 4, a capacitive element (electrode) 50 having a capacitance C1, a resistance element 51 having a resistance R1, and a Schmitt inverter 52 are connected to the oscillation circuit. An input voltage of the Schmitt inverter 52 is VC and an output voltage is VO. And When the input voltage VC of the Schmitt inverter 52 is charged by the charge / discharge characteristics of CR and reaches the inverted voltage to the Hi of the Schmitt inverter 52, the output voltage VO becomes Hi level. Next, when the voltage of the input voltage VC decreases due to the discharge characteristics and reaches the inverted voltage to Lo, the output voltage VO is inverted and becomes the LO level. Thereafter, by repeating this, the output voltage VO becomes a square wave oscillation waveform. The frequency is determined by the capacitor C1, the resistor R1, and the characteristics of the inverted voltage of the Schmitt inverter 52. If the characteristics of the Schmitt inverter 52 are constant, the oscillation frequency f is proportional to 1 / (C1 × R1).

  If the circuit of FIG. 4 is configured by using the electrode 10 of the handle portion 5 as the capacitor C1, the capacitance C1 increases due to the capacitance change caused by gripping a human hand, and therefore the oscillation frequency of the circuit decreases. By measuring this frequency, the capacitance change of the electrode 10 can be detected. The measurement of the oscillation frequency can be obtained, for example, by counting the rectangular wave number within a predetermined time.

  As described above, in the first embodiment, it is easy to freely dispose the electrode 10 on the handle portion 5 because it is detected that the electrostatic capacitance is changed by gripping a human hand. For this reason, it is possible to easily set a detection range other than a predetermined range such as the grip portion 5b, and it is possible to widen or freely set a range in which the operation can be stopped by the presence or absence of gripping. In addition, since no mechanical switch is used, there are no moving parts, there is little mechanical fatigue due to repetitive specifications, damage to the force transmission path due to vibration or impact, etc., and it can be used without breaking for a long time. No sound is generated. Furthermore, since the electrode 10 for detecting a change in capacitance can detect a person's grip even if it is covered with a dielectric material such as plastic, the appearance can be freely designed, and dust can enter. Not easy to break.

  Although the circuit 20 for detecting the change in capacitance is an oscillation circuit using the Schmitt inverter 52, it is needless to say that the circuit 20 has a characteristic that the waveform changes due to the change in the capacitance C. For example, as an oscillation active element, an analog IC such as an operational amplifier, a transistor, or an FET may be used in addition to a digital circuit such as a CMOS. Further, a frequency difference from a reference oscillation frequency generation circuit using a fixed CR may be taken out, or a circuit that converts the difference signal into an analog voltage value may be added.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view of the handle portion of the electric vacuum cleaner according to Embodiment 2 of the present invention. In the second embodiment, an electrode for detecting a change in capacitance is divided into at least two or more. That is, when an electrode is installed on the handle portion 5, it is necessary to provide an electrode at a site that is judged to be rarely held by a human hand because it increases the weight and is expensive. It is only necessary to install an electrode on the surface. For this reason, the electrodes are not integrated, but have a partial detection range divided into at least two locations.

The grip part electrode 11 for detecting a change in capacitance is an electrode for detecting the grip part 5b of the handle part 5 and the handle part front electrode 12 grips the front part of the handle part 5. In this case, the electrodes are used to detect this, and are each connected to the detection circuit 20 by a connection line 30. The range where these electrodes 11 and 12 do not exist, that is, the vicinity of the base of the grip portion 5b and the lower portion of the grip portion 5b behind the handle portion 5 is a range in which it is determined that the frequency of human gripping is low.
As described above, in the second embodiment, since the detection range is installed only in a necessary portion, there are few problems in detecting the presence / absence of gripping of a human hand in a normal usage, and this can reduce the weight and can be inexpensive. Can be configured. In the second embodiment, the electrodes 11 and 12 are divided into two, but the same effect can be obtained even if the number of divisions is further increased.

Embodiment 3 FIG.
FIG. 6 is an explanatory view of the handle portion and the extension pipe of the electric vacuum cleaner according to Embodiment 3 of the present invention. In the third embodiment, an electrode for detecting capacitance is also provided on the extension pipe 7. That is, the grip part electrode 13 is provided in the grip part 5 b, the handle part rear electrode 14 is provided in the handle part 5 below the grip part 5 b, the handle part front electrode 15 is provided in front of the handle part 5, and the extension pipe 6 is extended to the extension pipe 6. An electrode 16 is provided. Thus, by providing the extension pipe 6 with the extension pipe electrode 16 and electrically connecting it, it is possible to detect gripping by a human hand even when the extension pipe 6 is gripped. In addition, what is necessary is just to comprise the electrical connection of the extension pipe electrode 16 of the extension pipe 6 and the detection circuit of the handle | steering-wheel part 5 similarly to joining of the wiring of the electric power feeding to the power brush of the conventional floor nozzle, for example.

  As described above, according to the third embodiment, since the extension pipe electrode 16 is also installed in the extension pipe 6, it is gripped when a short child uses it or when a gap or a fine part is cleaned. In some cases, the extension pipe 6 can detect the presence / absence of gripping, can detect gripping in a wider range, expands the range in which the detecting means functions effectively, and is easy to use.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view of the handle portion of the electric vacuum cleaner according to Embodiment 4 of the present invention. In the fourth embodiment, at least two or more partial detection ranges are provided, and two or more detection circuits are provided. Both the grip part electrode 17 and the handle part rear electrode 18 are connected to the first detection circuit 21 by a connection line 30, and the handle part front electrode 19 is connected to the second detection circuit 22 by a connection line 31. The first and second detection circuits 21 and 22 are configured to output capacitance changes of the electrodes 17 and 18 and the electrode 19 connected thereto, respectively.

  Next, the operation will be described. Since the handle portion front electrode 19 is connected to the second detection circuit 22 on a one-to-one basis, the detection sensitivity is improved. This is because the electrode is small and the gripping range of the human hand is relatively wide compared to the capacity change rate when the gripping range by the human hand is relatively large and the electrode is small. This is because the capacitance change rate of the handle portion front electrode 19 increases according to the arrangement such as the handle portion front electrode 19 that is touched and the second detection circuit 22. Further, in the first detection circuit 21 to which the grip portion electrode 17 and the handle portion front electrode 18 are connected, the vacuum cleaner is operated when a person grips it, and the second detection circuit 22 to which the handle portion front electrode 19 is connected. In this case, if it is determined and controlled to stop the vacuum cleaner when a person grips it, different functions can be provided depending on the gripping location.

As described above, according to the fourth embodiment, it is possible to increase the capacitance change rate of an electrode to improve the detection sensitivity of a person's grip, or to provide a different function for each electrode. A highly functional vacuum cleaner can be provided.
Note that by increasing the number of electrodes or the number of detection circuits, higher sensitivity and higher functionality can be achieved.

Embodiment 5. FIG.
When operating the vacuum cleaner, the grip part 5b, the handle part 5 and the hose 4 are often in contact with each other so that the lower part is supported from below, and the upper part may be separated from the palm. For this reason, if an attempt is made to detect a hand contact at the top, the detection becomes unstable. Therefore, by providing the detection electrode on a part or all of the lower half of the grip portion 5b, the handle portion 5 or the hose 4, the portion of the electrode that does not contribute to detection can be omitted and reduced in weight, and can be configured at low cost. it can.

Embodiment 6 FIG.
FIG. 8 is an enlarged cross-sectional view of a part of the extension pipe of the vacuum cleaner according to Embodiment 6 of the present invention. In the drawing, the extension pipe 6 is divided into two parts, an upper surface side part 60 and a lower surface side part 61, and the upper surface side part 60 has a flow path 60a through which sucked dust is passed. The lower surface part 61 has a space 61a, and a filter film layer 62 for electromagnetic shielding is provided on the surface of the upper surface part 60 on the side close to the flow path 60a. Between the lower surface 61b of the space 61a of the lower surface part 61 and the filter film layer 62, an electrostatic capacitance electrode 16a having an arbitrary length is fixedly disposed at an arbitrary position so as to be sandwiched between them.
As described above, in the sixth embodiment, the capacitance electrode 16 a having an arbitrary length is provided inside the lower surface part 61 of the extension pipe 6.

  Next, the operation will be described. When a person grips the pipe, the thumb f1 grips the upper surface side part 60, and the other finger f2 grips the lower surface side part 61 to cover a part of the extension pipe 6. Thus, when the person holds the extension pipe 6 with the extension pipe 6 in which the capacitance electrode 16a for detecting the person's capacitance is embedded in the lower surface part 61, it is reliably detected that the extension pipe 6 has been held. Is done.

  When the electric blower 3 is driven, dust is sucked in. However, when dust passes through the flow path 60a, static electricity may be generated due to friction between the dust flowing in the flow path 60a and the inner wall of the extension pipe 6. However, since the shielding filter film layer 62 for shielding static electricity is provided on the flow path 52 side in the space portion 61a, it is possible to shield the static electricity and reliably detect the human capacitance. It becomes possible. Thus, the capacitance electrode 16a is not erroneously detected by the influence of the transient signal of static electricity.

Embodiment 7 FIG.
FIG. 9 is an enlarged cross-sectional view of a part of the extension pipe of the electric vacuum cleaner according to Embodiment 7 of the present invention. In the seventh embodiment, for the operation stop having one or more independent surface areas at arbitrary positions at arbitrary positions on the upper surface plate member 60b of the upper surface side part 60 of the extension pipe 6 shown in the sixth embodiment. The upper surface side capacitance electrode 16b (or mechanical switch 70) is embedded and constitutes a sensor (or switch) for responding to a sudden shutdown.

  Next, the operation will be described. The cleaner is operated according to the capacitance detected by the capacitance electrode 16a provided on the lower surface side part 61. At this time, since the capacitance electrode 16 a is provided in the lower surface part 61, the operation can be performed regardless of where the extension pipe 6 is gripped. When an emergency stop is desired, the operation can be stopped at any time by the upper surface side capacitance electrode 16b (mechanical switch 70).

Embodiment 8 FIG.
FIG. 10 is an enlarged cross-sectional view of a part of the extension pipe of the electric vacuum cleaner according to the eighth embodiment of the present invention, and detection is performed more efficiently in the capacitance electrode 16a shown in the sixth and seventh embodiments. The electrode pattern which can be performed is shown.
FIG. 10A shows a case where electrode lines are formed long in the longitudinal direction (left and right direction in the figure) of the extension pipe 6 in the electrode pattern, and a plurality of longitudinal electrodes are provided side by side substantially parallel to the longitudinal direction. The ends of the longitudinal electrodes are alternately intersected to form a wedge shape having a U shape or an inverted U shape.
FIG. 10B shows a case where electrode lines are formed in the short direction (vertical direction in the figure) of the extension pipe 6 in the electrode pattern, and a plurality of short direction electrodes are provided in parallel with the short direction. Then, the end portions of the adjacent short direction electrodes are alternately crossed to form a wedge shape having a U shape or an inverted U shape.

As shown in Formula (1) of Embodiment 1, the capacitance C between the electrodes is expressed by the following formula.
C = E0 × Er × S / D = E × S / D (1)
Where C is the capacitance (F), E0 is the dielectric constant of vacuum (F / meter), Er is the relative dielectric constant of the object between the two electrodes, S is the electrode area (square meter), and D is the distance between the electrodes ( M) and E indicate the dielectric constant (F / meter) of the object between the two poles.
As shown in the equation (1), the capacitance C increases in proportion to the electrode area S and decreases in inverse proportion to the interelectrode distance D. That is, the capacitance C can be efficiently detected by providing the electrode area S as large as possible and decreasing (narrowing) the inter-electrode distance D.

In any of the electrode patterns, the capacitance electrode 16a is formed by forming a wedge-shaped electrode wire formed in a wire shape, a flat plate shape or the like on the surface of a base material such as a plastic thin film. A shape in which the electrode width A is increased to increase the area and the distance D between the electrodes is narrowed is formed on the base material.
This shape makes it possible to reliably detect a change in capacitance.

Embodiment 9 FIG.
FIG. 11 is an explanatory view showing a configuration of a switch for controlling the rotation state of the electric blower of the electric vacuum cleaner according to the present invention, which is formed at any position of the handle portion 5, the grip portion 5b, and the extension pipe 6. It has been done.
FIG. 11A shows a display design unit 80 that presents a driving operation provided at an arbitrary position of the extension pipe 6. The display design unit 80 is provided with a static operation mark 81 and a strong operation mark 83, and an intermediate operation mark 82 between which the static operation mark 81 and the strong operation mark 83 can perform weak operation and intermediate operation. Is provided.
FIG. 11B shows an equivalent pattern portion 85 formed by a capacitance electrode disposed on the lower surface of the display design portion 80. An equivalent pattern portion 85 is disposed on the lower surface of the display design portion 80, and an equivalent pattern 91 of the static operation mark 81 and an equivalent pattern 93 of the strong operation mark 83 are provided between the static operation mark 81 and the strong operation mark 83. The intermediate operation mark 82 is provided with an equivalent pattern 92a for weak operation and an equivalent pattern 92b for intermediate operation.

The corresponding pattern portion 85 is formed in a wedge shape, a circular shape, a quadrangular shape, or the like, and each corresponding pattern formed in the corresponding pattern portion 85 in order to detect that a human finger has surely contacted each mark. 91, 92a, 92b, and 93 are formed with an arbitrary distance L between patterns.
Thereby, for example, when a human finger comes in contact with the static operation mark 81 of the display design unit 80, the equivalent pattern 91 for silent operation positioned under the static operation mark 81 detects the capacitance of the finger alone. Thus, the adjacent weak driving equivalent pattern 92a is prevented from detecting the finger. Therefore, depending on the position of the finger, each of the corresponding patterns 91, 92a, 92b, and 93 individually detects the capacitance of the finger and rotates the electric blower 3 according to the operation.

In the first to fifth embodiments, even if the electrodes 10 to 19 and the detection circuits 20 to 22 are configured in the straight handle portion 5 from which the grip portion 5b does not protrude, the same effect can be obtained.
In addition, a power supply electric wire built in an extension pipe, a handle portion, or a hose of a conventional vacuum cleaner can be configured as a detection electrode for capacitance. Furthermore, when the extension pipe electrode 16 is provided on the extension pipe 6, even if the extension pipe 6 is removed, the electrodes 10 to 15 and 17 to 19 of other parts such as the handle portion 5 can be detected. You can also Further, the detection circuits 20 to 22 and the determination circuit may be appropriately divided and installed in the cleaner body 1 and the handle portion 5. Furthermore, the shape of the electrodes 10 to 19 may be a twisted wire, a single wire, or a flat plate such as a pattern, may not be covered, and the electrode on the ground side may be omitted.

In the first to ninth embodiments described above, the case of the electric vacuum cleaner has been described. However, not only the electric vacuum cleaner but also an electrode and a circuit that detect capacitance with respect to a part that is attached to a home appliance and that is held by a human being. Can be installed. For example, an electrode for detecting capacitance according to the present invention can be configured on a grip for opening and closing a door of a microwave oven.
12A is a perspective view of the microwave oven, and FIG. 12B is a cross-sectional view of the grip of the microwave oven. In the figure, the front door 101 of the main body 100 of the microwave oven is provided with a grip 103 held by a human hand to open and close the front door 101. An electrode 10 for detecting capacitance is provided in the grip 103 so as to be sandwiched between the filter film layers 62. Although a strong electromagnetic wave is generated in the microwave oven, the filter film layer 62 can prevent malfunction due to the influence of the electromagnetic wave.
When a human holds the grip 103, the capacitance is detected by the capacitance detection electrode 10. By detecting the human capacitance, the gears (not shown) of the electrical machine part for opening and closing the front door 101 are operated to support the opening and closing of the front door 101 easily and automatically. To do.

It is a perspective view of the vacuum cleaner which concerns on Embodiment 1 of this invention. It is sectional drawing of the handle | steering-wheel part shown in FIG. It is explanatory drawing which shows the electrostatic capacitance change in a parallel plate electrode. FIG. 3 is an oscillation circuit diagram configured by a capacitor and a resistor. It is sectional drawing of the handle | steering-wheel part at the time of dividing the electrode which concerns on Embodiment 2 of this invention into two or more. It is explanatory drawing at the time of providing the electrode which concerns on Embodiment 3 of this invention in a handle | steering-wheel part and an extension pipe. It is sectional drawing of the handle | steering-wheel part at the time of dividing | segmenting the electrode which concerns on Embodiment 4 of this invention into two or more, and providing two or more detection circuits. It is sectional drawing to which a part of extension pipe concerning Embodiment 6 of the present invention was expanded. It is sectional drawing to which a part of extension pipe concerning Embodiment 7 of the present invention was expanded. It is sectional drawing which shows the electrode pattern of the electrode for electrostatic capacitance of the extension pipe which concerns on Embodiment 8 of this invention. It is explanatory drawing which shows the structure of the switch for controlling the rotation state of the electric blower concerning Embodiment 9 of this invention. It is the perspective view and sectional drawing at the time of providing the electrode for electrostatic capacitances which concerns on this invention in a microwave oven.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner body, 2 Dust collection chamber, 3 Electric blower, 4 Hose, 5 Handle part, 5b Grip part, 5c Grip lever, 6 Extension pipe, 7 Floor nozzle, 10 Capacitance detection electrode, 11 Grip part Electrode, 12 Handle part front electrode, 13 Grip part electrode, 14 Handle part rear electrode, 15 Handle part front electrode, 16 Extension pipe electrode, 16a Electrostatic capacity electrode, 17 Grip part electrode, 18 Handle part rear electrode, 19 Handle Part front electrode, 20, 21, 22 detection circuit, 30, 31 connecting line, 60 upper surface side part, 61 lower surface side part, 60a flow path, 61a space part, 62 filter membrane layer, 100 microwave oven body, 103 grip.

Claims (9)

  A capacitive sensing device for home appliances, comprising an electrode for detecting a change in capacitance of a person and a detection circuit for converting the change in capacitance detected by the electrode into an electric signal.   The capacitance sensing device for home appliances according to claim 1, wherein the detection range of the electrode for detecting a change in capacitance is composed of at least two separate partial detection ranges.   The detection range of the electrode for detecting a change in capacitance is composed of at least two or more separate partial detection ranges, and includes the detection circuit corresponding to at least one or more partial detection ranges, and is independent according to the partial detection range. The capacitive sensing device for home appliances according to claim 2, wherein the detected signal can be taken out.   4. The capacitive sensing device for home appliances according to claim 1, wherein external noise is shielded by a filter film layer for shielding.   An electric blower for sucking dust, a floor nozzle on which the suction force of the electric blower acts, a handle part for moving the floor nozzle, and an extension pipe provided between the handle part and the floor nozzle, Detecting means for detecting a gripping state by a person, and the detecting means is provided on both or one of the handle portion and the extension pipe, and detects an electrostatic change of the person, and the electrode. A vacuum cleaner comprising: a detection circuit that converts a detected capacitance change into an electrical signal.   6. The electric vacuum cleaner according to claim 5, wherein a detection range of the electrode for detecting a change in capacitance is a lower half of at least one of the handle portion and the extension pipe.   The extension pipe is divided into parts on the upper surface side and the lower surface side, a flow path portion is formed in the upper surface side part, a space portion is provided in the lower surface side part, and the electrode is formed on the lower surface side of the space portion of the lower surface side part. The vacuum cleaner according to claim 5 or 6, wherein a filter film layer for shielding that shields external noise is provided on the upper surface side.   8. The electric vacuum cleaner according to claim 5, wherein the electrode wire of the electrode is repeatedly bent left and right or up and down. The vacuum cleaner according to claim 7 or 8, wherein a plurality of the electrodes are provided and the electrodes are arranged at an arbitrary interval.

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