JP2005227242A - Electrostatic capacity type sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic capacity type sensor easily mountable to a mounting member while suppressing the projecting dimension of the sensor when mounted to the mounting member. <P>SOLUTION: This electrostatic capacity type sensor 1 is provided with a pair of sensor electrodes 31, 32 provided at a space; a shield electrode 33 surrounding the sensor electrodes 31, 32 with a space; and a covering member 36 formed of an insulating material to hold the sensor electrodes 31, 32 and the shield electrode 33. The covering member 36 has a mounting part 3a for mounting to a mounting member 4. The mounting part 3a is provided with a core member 33b with the same electric potential as the shield electrode 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a capacitive sensor used in a door driving device that automatically opens and closes an opening / closing body such as an automobile door, and relates to a capacitive sensor that detects an object such as a nearby human body.

Conventionally, in order to prevent an object such as a hand or a finger from being caught between a movable body such as an automatic opening / closing slide door or a power window of a vehicle such as an automobile and a fixed frame body such as a pillar. An anti-pinch device using a capacitive sensor has been proposed (see Patent Document 1).
This pinching prevention device is provided with a capacitance detection unit that outputs a detection signal corresponding to the capacitance formed between the sensor electrode and an object by installing a sensor electrode at a predetermined part of the frame. Upon receiving the detection signal output from the electrostatic capacitance detection unit and detecting that an object has been sandwiched between the frame and the movable body, the signal processing unit issues a pinching prevention command. It is configured as follows.

  The capacitance formed between the sensor electrode and the object is proportional to the area of the portion of the sensor electrode that is considered to face the object, and the distance between the sensor electrode and the object is half proportional. Accordingly, since this capacitance is defined by the distance between the two, the detection unit corresponding to this capacitance outputs the detection signal to the signal processing unit. Then, when the signal processing unit detects that the value of the received detection signal exceeds the threshold value for determining the object pinching, the signal processing unit issues a pinching prevention command to move the door or the sliding door in the opening direction. .

FIG. 7 is a perspective view of a main part of an automobile showing a state where it is installed on a slide door of a conventional capacitive sensor.
As shown in FIG. 7, conventionally, an automobile is provided with a so-called power slide door that automatically opens and closes by moving the slide door 200 in the front-rear direction by a door drive device 400 using a motor (not shown) as a drive source. There is something. The conventional door driving device 400 includes a device that automatically opens and closes the sliding door 200 by a user operating an operating means provided near a driver's seat or a door handle, and automatically opens and closes the sliding door 200. There is a device that detects that 200 has moved a predetermined distance by a manual force, activates the door driving device 400 in response to this, and automatically opens and closes the sliding door 200.

  Since the slide door 200 moved by the door driving device 400 automatically closes the slide door 200, there is a possibility that an object such as an occupant or a baggage is sandwiched between the slide door 200 and the pillar 110 or the front door 500. For this reason, conventionally, a capacitive sensor 300 of an anti-pinch device (not shown) is attached to the slide door 200 in order to prevent the pinch.

8 is an enlarged cross-sectional view in the XX direction of FIG.
In general, as shown in FIG. 8, the capacitive sensor 300 includes a detection electrode E1, a ground electrode E2, an insulator In sandwiched between the detection electrode E1 and the ground electrode E2, and the detection electrodes E1, And a covering member 310 made of an insulating material disposed so as to surround the periphery of the ground electrode E2 and the insulator In.
As shown in FIG. 8, the capacitive sensor 300 is attached via a bracket 600 to a flange portion 202 formed at a front end portion (front end portion 201) on the side to be closed in the slide door 200. Specifically, the capacitive sensor 300 is attached to the surface of the slide door 200 on the side of the vehicle interior R by attaching the bracket 600 to the L-shaped bracket 600 in plan view inside the flange portion 202 of the slide door 200. It is installed.

FIG. 9 is an electric block diagram showing a configuration of a conventional capacitance type sensor.
In such a capacitive sensor 300, as shown in FIG. 9, charges are supplied from the charge supply circuit to the detection electrode E1 via the transmission circuit and the output amplifier. That is, since the detection electrode E1 and the ground electrode E2 constitute a capacitor, the potential V output through the detection amplifier is expressed by the following equation (1).
V = Q / (C1 + C2) (1)
(In the formula (1), Q represents the amount of electricity stored in the capacitive sensor (capacitor) 300, C1 represents the capacitance of the capacitive sensor 300 itself, and C2 represents static electricity. (It represents the electrostatic capacitance between the capacitive sensor 300 and the ground, that is, stray capacitance.)

When the human body approaches the capacitive sensor 300, the potential V changes due to the electrostatic capacity between the capacitive sensor 300 and the human body. That is, this potential V is expressed by the following equation (2).
V = Q / (C1 + C2 + C3) (2)
(However, in Formula (2), Q, C1, and C2 are the same as the above, and C3 represents the electrostatic capacitance between the capacitive sensor 300 and the human body.)

Therefore, C3 increases as the human body approaches the capacitive sensor 300, and as a result, the potential V output via the detection amplifier decreases. That is, the capacitive sensor 300 detects a human body based on such a change in potential V.
JP 2001-32628 (paragraphs 0002 to 0026, FIG. 1)

However, since the conventional capacitive sensor 300 is attached to the flange portion 202 of the front end 201 of the slide door 200 via the bracket 600, the length L (sensor protruding dimension) of the capacitive sensor 300 is obtained. Only protruding from the front end 201 is attached. As a result, when the sliding door 200 is moved in the forward direction of the arrow A and closed, the sensor 300 is close to the front door 500 when the sliding door 200 is closed. There was a risk of false detection.
Further, since the capacitive sensor 300 is disposed so as to protrude from the front end portion 201 of the slide door 200, there is a problem that the appearance is poor and the appearance is impaired.
Furthermore, since the capacitance type sensor 300 is installed on the slide door 200 by the bracket 600, a fixing member such as a screw for fixing the bracket 600 to the capacitance type sensor 300 or the slide door 200 is necessary. There was a problem that the number of parts and installation man-hours were large.

  Therefore, the present invention has been made to solve the problems of the prior art, and an object of the present invention is to suppress the sensor protruding dimension when attached to the attachment member and easily attach the attachment to the attachment member. It is an object of the present invention to provide a capacitive sensor that can be used.

  In order to solve the above-mentioned problem, a pair of sensor electrodes in which the capacitive sensor according to claim 1 is provided apart from each other, a shield electrode that surrounds and separates the sensor electrode, the sensor electrode, and the shield electrode And a covering member made of an insulating material for holding the covering member, the covering member having a mounting portion for mounting on the mounting member, and the shield electrode on the mounting portion And a core member having the same potential as that of the first electrode is provided.

According to the first aspect of the present invention, the capacitive sensor prevents the erroneous detection when the door is closed by setting the core member provided at the mounting portion to the same potential as the shield electrode, and has a disturbance preventing effect. Can be improved. Therefore, since the pinching threshold value when the door is closed can be set as large as possible, pinching detection sensitivity can be improved.
Further, since the attachment portion for attaching to the attachment member is provided, the capacitance type sensor can be fixed to the attachment member only by attaching the attachment portion to the attachment member. For this reason, the capacitance type sensor can be mounted simply by being pushed into the mounting member, the mounting operation is easy, the mounting bracket and the like are completely unnecessary, and the number of components can be reduced.
Further, the core member is preferably inserted into the attachment portion of the covering member, thereby preventing the attachment portion from being deformed and deformed by an external force by the core member and falling off from the attachment member. it can. For this reason, the strength of the attachment portion is increased, and the capacitance type sensor can be securely held.

  A capacitive sensor according to a second aspect is the capacitive sensor according to the first aspect, wherein the core member is integral with the shield electrode.

  According to the invention described in claim 2, since the core member and the shield member are integrated with the shield electrode, the core member and the shield member become one member. Therefore, the number of components in the capacitive sensor is reduced. Productivity can be improved by simplifying the structure of the capacitive sensor.

  The capacitance type sensor according to claim 3 is the capacitance type sensor according to claim 1 or 2, wherein the shield electrode and the core member are made of a conductive metal. To do.

  According to the third aspect of the present invention, the shield electrode and the core member are made of conductive metal, so that they constitute the skeleton of the capacitive sensor, so that the attachment portion is fixed to the attachment member. As a result, the holding force is improved, and a strong attachment strength can be obtained.

  The capacitance type sensor according to claim 4 is the capacitance type sensor according to any one of claims 1 to 3, wherein the attachment portion is attached to the attachment member. It has a fitting groove, the shield electrode is opened on the detection part side, and the core member and the fitting groove are formed on the opposite side to the detection part.

  According to the fourth aspect of the present invention, the core member and the fitting groove are formed so as to open on the side opposite to the detection portion, so that the opening direction of the fitting groove faces the direction of the attachment member. Therefore, the capacitance type sensor can be fixed to the mounting member by pushing the fitting groove into the mounting member. For this reason, since the part fitted to the fitting groove of the attachment member is immersed in the fitting groove, the protruding dimension of the capacitive sensor protruding from the attachment member is shortened to improve the appearance.

According to the capacitance type sensor of the first aspect, it is possible to prevent erroneous detection when the door is closed by setting the core member of the mounting portion to the same potential as the shield electrode. In addition, since the capacitance type sensor has an attachment portion for attaching to the attachment member, the capacitance type sensor can be fixed to the attachment member simply by attaching the attachment portion to the attachment member. Therefore, the mounting work is easy, the mounting bracket is not necessary, and the number of parts can be reduced. In addition, when a core member is inserted in the attachment part of the capacitance type sensor, the attachment part can prevent the attachment part from being deformed by an external force and falling off from the attachment member. The strength of the sensor increases, and the capacitive sensor can be held firmly.
According to the capacitive sensor of the second aspect, since the core member is integrated with the shield electrode, the number of components in the capacitive sensor is reduced, and the structure of the capacitive sensor is simplified. Productivity.
According to the capacitance type sensor of the third aspect, since the shield electrode and the core member are made of conductive metal, the holding force for fixing the attachment portion to the attachment member is improved, and the strong attachment strength is obtained. Can be obtained.
According to the capacitance type sensor of the fourth aspect, since the fitting groove is formed to open in the direction opposite to the detection portion, the opening direction of the fitting groove is the direction of the attachment member. Therefore, the capacitance type sensor can be fixed to the mounting member by pushing the fitting groove into the mounting member. As a result, the portion that fits into the fitting groove of the mounting member is immersed in the fitting groove, so that the sensor protruding dimension of the capacitive sensor protruding from the mounting member is shortened to improve the appearance. be able to.

Hereinafter, a capacitance type sensor according to an embodiment of the present invention will be described with reference to FIGS. In the embodiment of the present invention, “front” is the vehicle traveling direction side, and “rear” is the vehicle backward direction side.
FIG. 1 is a perspective view showing a state when a capacitive sensor according to an embodiment of the present invention is attached to a sliding door of an automobile. FIG. 2 is an explanatory diagram showing an outline of an anti-pinch device including the capacitive sensor according to the embodiment of the present invention. FIG. 3 is a block diagram showing an outline of an anti-pinch device including the capacitive sensor according to the embodiment of the present invention. 4 is a cross-sectional view taken along the line XX in FIG. 1. FIG. 4A is a cross-sectional view of the capacitance type sensor before being mounted on the slide door, and FIG. 4B is a view when mounted on the slide door. It is sectional drawing of the capacitive type sensor which shows the state of.

  The capacitance type sensor according to the present embodiment detects an object to be detected (hereinafter simply referred to as “object”) having a stray capacitance such as a human body based on the change in capacitance. Hereinafter, the capacitance type sensor 3 will be described by taking as an example a case where the capacitance type sensor 3 is used in an object pinching prevention device 2 for an automobile as shown in FIG. The anti-pinch device 2 is installed on an open / close body such as a slide door 4 (see FIGS. 1 and 2) that is automatically opened and closed by the door driving device 1. An embodiment of the present invention will be described by taking as an example a capacitance type sensor 3 installed on a sliding door 4 composed of an electric sliding door on the left side seat in the middle row that opens.

First, the sliding door 4 and the pinching prevention device 2 will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, the slide door 4 provided on the side portion of the vehicle body 5 includes a so-called power slide door that automatically closes the door opening 52 by the door driving device 1. The electric power type sliding door 4 includes a static prevention device 2 (see FIG. 3) formed in an appropriate shape along the closing end 4a facing the pillar 51 of the sliding door 4 to be opened and closed. A capacitive sensor 3 is extended.
The slide door 4 corresponds to an “attachment member” described in the claims.

The pinching prevention device 2 shown in FIG. 3 detects the pinching of the object by the detection circuit unit 6 detecting a potential that drops when the object approaches the capacitive sensor 3, and receives a command from the detection circuit unit 6. It is a device that prevents an object from being caught by causing a reverse current to flow from the ECU 7 to the door driving device 1 based on the signal. The anti-pinch device 2 processes an electrostatic capacitance detection circuit unit 6 that receives an object detection signal transmitted when an object approaches the capacitive sensor 3 and a signal from the detection circuit unit 6. An ECU (Electronic Control Unit) 7 and a door drive device 1 that stops or moves the sliding door 4 in the opening direction according to a pinching prevention command from the ECU 7 are provided. The sliding door 4 is automatically closed by the door driving device 1.
Such automatic opening and closing of the sliding door 4 by the door driving device 1 is performed by a switch (not shown) installed in a driver's seat away from the sliding door 4 or a sensor that detects a sliding door that moves in the closing direction by manual force. This is performed by a signal from (not shown). The slide door 4 is provided with a pinching prevention device 2 that detects that an object has been pinched between the slide door 4 and the vehicle body 5. The anti-pinch device 2 as a safety device of the slide door 4 detects that the person is approaching or an object such as a person's hand is caught by the capacitive sensor 3 when the slide door 4 is closed. At times, the electric motor (not shown) of the door drive device 1 is urgently controlled to move the slide door 4 in the opening direction.

  The detection circuit unit 6 includes a first reference capacitor C1, a second reference capacitor C2, a charge supply circuit 61 that repeatedly charges and discharges and supplies a potential to the difference detection circuit 62 when the slide door 4 is opened, A difference detection circuit 62 that detects a difference value between the capacitance values generated between the first and second sensor electrodes 31 and 32 as the object approaches, and the difference value is equal to or greater than a predetermined non-contact detection threshold value or the difference The signal processing circuit 63 detects whether the value is equal to or less than a predetermined contact detection threshold value.

Next, the electrical connection relationship of the pinching prevention device 2 will be described with reference to FIG.
The first sensor electrode 31 is connected to the charge supply circuit 61 via a first reference capacitor C1 of the capacitive sensor 3 to be described later. The second sensor electrode 32 is connected to the charge supply circuit 61 via the second reference capacitor C2. The shield electrode 33 is connected to the charge supply circuit 61. One of the first reference capacitors C <b> 1 is connected to the charge supply circuit 61 and the other is connected to the difference detection circuit 62. The charge supply circuit 61 is connected to the signal processing circuit 63 via the differential detection circuit 62. One of the ECUs 7 is connected to the signal processing circuit 63 and the other is connected to the door driving device 1.

Next, the capacitive sensor 3 will be described with reference to FIGS. 1 and 4 (a) and 4 (b).
As shown in FIG. 1, the capacitive sensor 3 has a substantially rectangular cross section and is elongated, and the slide door 4 is attached from the upper end to the lower end of the end portion 4 a on the door opening 52 closing side. . The electrostatic capacity type sensor 3 has an outer portion formed by a covering member 36 and is attached to a flange portion 4b formed at the front end portion 4a of the slide door 4 as shown in FIG.

As shown in FIG. 4A, the capacitance type sensor 3 includes a detection unit 3c in which a first sensor electrode 31, a second sensor electrode 32, a shield electrode 33, and an insulator 35 are provided, and a sliding door. A mounting portion 3a for mounting the capacitive sensor 3 is integrally formed on the four flange portions 4b. The capacitive sensor 3 includes a first sensor electrode 31, a second sensor electrode 32, an insulator 35 sandwiched between the first and second sensor electrodes 31, 32, and the first and second sensor electrodes 31. , 32 and a shield electrode 33 that is driven at the same potential, and the first and second sensor electrodes 31, 32, the insulator 35, and a covering member 36 made of an insulating material that holds the shield electrode 33 in place. Yes. The capacitive sensor 3 has three electrodes, a first sensor electrode 31, a second sensor electrode 32, and a shield electrode 33, and these electrodes are covered by a covering member 36 made of an insulating material such as synthetic rubber or synthetic resin. Covered and held.
In addition, the capacitive sensor 3 has the attachment portion 3a attached to the flange portion 4b of the slide door 4, and the detection portion 3c adjacent to the attachment portion 3a prevents water droplets such as rain from being applied. The flange portion 4b is disposed on the vehicle compartment R side.

As shown in FIG. 4A, the first sensor electrode 31 and the second sensor electrode 32 are formed of a strip-shaped conductive material having a constant width and a fixed length. Examples of the conductive material constituting the first and second sensor electrodes 31 and 32 include metal, conductive rubber, and conductive resin. The first sensor electrode 31 is provided in the vicinity along the detection surface 3d of the detection unit 3c that detects an adjacent object.
The first sensor electrode 31 and the second sensor electrode 32 correspond to “sensor electrodes” recited in the claims.

  The second sensor electrode 32 is formed of a strip-shaped conductive material having a narrow width compared to the width of the first sensor electrode 31 and having a length equal to the length of the first sensor electrode 31. Is smaller than the area of the first sensor electrode. The second sensor electrode 32 is disposed in parallel to the rear side of the first sensor electrode 31 via an insulator 35 made of air, for example, and is provided apart from the first sensor electrode 31 to be a pair of sensor electrodes. Is configured.

The shield electrode 33 prevents disturbance to the first and second sensor electrodes 31 and 32, and provides directivity of the electric lines of force of the first and second sensor electrodes 31 and 32 in the direction of the detection unit 3c. It is made of a conductive metal and constitutes the skeleton of the capacitive sensor 3. The shield electrode 33 may be formed of conductive hard rubber or conductive hard resin. The shield electrode 33 is formed by a body portion 33a having a U-shaped cross section disposed so as to surround the first and second sensor electrodes 31, 32 and the insulator 35 at a predetermined interval, and a covering member 36. The section inserted into the formed attachment portion 3a is formed of a single member formed integrally with a U-shaped core member 33b.
The main body 33a is formed in a U-shape with an opening on the detection unit 3c side, and the first and second sensor electrodes 31 and 32 are arranged in the main body 33a to protect against disturbance or external force. In addition, it is a member for giving directivity to the direction of the detection unit 3c.
The core member 33b is a reinforcing member provided in the covering member 36 that forms the fitting groove 3b of the attachment portion 3a. The core member 33b is formed along the fitting groove 3b and opened to the flange portion 4b side. Has a mold.

The covering member 36 is made of hard, insulating synthetic rubber or synthetic resin so that the capacitance type sensor 3 does not lose its shape. The covering member 36 has a fitting groove 3b that opens to the opposite side to the detection portion 3c and is attached to the flange portion 4b of the slide door 4. A plurality of so-called lip packing-like ridges 3e are formed on the inner wall of the fitting groove 3b on the vehicle interior R side and the inner wall on the outdoor side of the fitting groove 3b. The protrusion 3e is formed of a protruding piece formed obliquely in the direction toward the inner wall of the fitting groove 3b, so that the flange portion 4b is easily press-fitted and is not easily removed.
The covering member 36 may be formed such that the protrusion 3e is two-color molded with soft synthetic rubber or soft synthetic resin so that the protrusion 3e is in close contact with the flange portion 4b.

Next, the operation of the capacitive sensor 3 according to the embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b).
When the capacitance type sensor 3 is attached to the slide door 4, as shown in FIG. 4A, the fitting groove 3b is press-fitted into the flange portion 4b. Then, as shown in FIG. 4B, the capacitive sensor 3 is attached so that the fitting groove 3b covers the flange portion 4b. Since the capacitance type sensor 3 has the fitting groove 3b for mounting on the slide door 4, the capacitance type sensor 3 can be fixed simply by pushing the fitting groove 3b into the flange portion 4b. The mounting operation of the sensor 3 is simplified.

  Since the flange portion 4b is immersed in the capacitive sensor 3 by being fitted in the fitting groove 3b, the sensor protruding dimension L1 from the flange portion 4b of the capacitive sensor 3 is several millimeters. And a little. The capacitive sensor 3 has a small sensor protrusion dimension L1, thereby improving the appearance and reducing contact of the occupant with the capacitive sensor 3 when getting on and off the vehicle. .

  Even when an external force is applied to the analog attachment part 3a or the like, the electrostatic capacity type sensor 3 is inserted into the attachment part 3a by the core member 33b of the shield electrode 33. It can be prevented that the joint groove 3b loses its shape due to external force and the capacitive sensor 3 falls off the flange portion 4b. As described above, the strength of the attachment portion 3a and the fitting groove 3b is increased by the core member 33b, and the capacitive sensor 3 can be firmly fixed to the flange portion 4b.

  And since the 1st and 2nd sensor electrodes 31 and 32 are covered with the shield electrode 33, since it can reduce that external force is loaded, durability with respect to external force can be improved. The shield electrode 33 has a U-shaped body portion 33a and a U-shaped core member 33b which are integrally formed and connected to increase the strength. Therefore, the shape can be prevented.

  In addition, since a plurality of protrusions 3e are formed in the fitting groove 3b in which the flange part 4b is mounted, the protrusions 3e are in close contact with the front and back surfaces of the flange part 4b. The sensor 3 can be firmly fixed to the flange portion 4b.

Next, the operation of the anti-pinch device 2 using the capacitive sensor 3 will be described mainly with reference to FIG.
FIG. 5 is a flowchart showing the operation of the pinching prevention device using the capacitive sensor according to the embodiment of the present invention.

First, by turning on an ignition switch (not shown), the engine is started and the anti-pinch device 2 can be activated. The sliding door 4 shown in FIGS. 1 and 2 is closed by a switch (not shown) or the like provided in the driver's seat or the like during traveling of the vehicle, and the sliding door 4 and the door opening 52 are closed. There are no objects in between.
When the occupant gets on and off the vehicle, by operating the switch (not shown) or the like to move the slide door 4 rearward and the door opening 52 opens, the first sensor electrode shown in FIG. 31 and the second sensor electrode 32 are charged with charge from the charge supply circuit 61 (step S1).

  When the sliding door 4 starts to move in the closing direction by the door driving device 1, an encoder (not shown) generated in response to rotation of an electric motor (not shown) provided in the door driving device 1. With this pulse signal, the ECU 7 detects that the door driving device 1 is moving the slide door 4 (see FIG. 2) in the closing direction (step S2), and proceeds to step S3.

  In step S <b> 3, the difference value of the electric charge corresponding to the capacitance is input to the first sensor electrode 31 and the second sensor electrode 32 of the capacitance type sensor 3 and is detected by the potential.

Subsequently, the signal processing circuit 63 determines, based on the difference value of the output of the difference detection circuit 62, whether or not the object has been caught depending on whether or not the object has been caught or not (step S4). If the difference value is equal to or smaller than the predetermined threshold value, it is determined that no object is caught, and the process returns to step S3 to detect the difference value again.
On the other hand, when the difference value is equal to or smaller than the predetermined threshold value, it is determined that the object is caught, and the process proceeds to step S5.

  When an object is caught in the slide door 4, the signal processing circuit 63 issues a command signal for stopping the door drive device 1 via the ECU 7, thereby stopping the door drive device 1 instantaneously or opening the slide door 4. Invert to move in the direction. When the slide door 4 returns to the door open position, the drive of the door drive device 1 is stopped. Thus, one cycle of processing is completed.

  In step S <b> 4, the signal processing circuit 63 issues a command to switch the driving direction of the door driving device 1, so that the sliding door 4 is instantaneously stopped or reversed. Or an object close to the capacitive sensor 3 of the sliding door 4 can be prevented.

  The capacitive sensor according to the embodiment of the present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. It goes without saying that the invention extends to these modified and changed inventions.

  FIG. 6 is a view showing a modified example of the capacitive sensor according to the embodiment of the present invention. FIG. 6A is a sectional view of the capacitive sensor showing a state before being mounted on the slide door. b) It is sectional drawing of an electrostatic capacitance type sensor which shows a state when mounted | worn with a slide door.

For example, the electrostatic capacitance type sensor 3 is configured such that the shield electrode 33 inserted into the covering member 36 shown in FIGS. 4A and 4B is connected to the detection unit 3c as shown in FIGS. 6A and 6B. A U-shaped shield electrode 37 covering the first sensor electrode 31, the second sensor electrode 32 and the insulator 35, and a U-shaped core provided so as to cover the fitting groove 3b of the mounting portion 3a. It may be separated from the member 38.
The capacitance type sensor 3 can obtain the same operation and effect as the above-described embodiment even if the U-shaped shield electrode 37 and the core member 38 which are separately provided are provided in the covering member 36. be able to.

Note that the attachment member to which the capacitance type sensor 3 is attached is not limited to the slide door 4, and may be an opening / closing body that is automatically opened and closed by an automatic opening / closing device such as the door driving device 1. It may be a hinged door, gull-wing door, back door, trunk, sunroof or the like.
Further, the capacitance type sensor 3 is not limited to be installed on the movable body side such as the slide door 4, and for example, a front side provided on the side of the door opening 52 of the vehicle body 5 on the side where the slide door 4 is closed. You may install in the fixed body side, such as the door 8 and the pillar 5 (refer FIG. 1).

It is a perspective view which shows a state when the capacitive type sensor which concerns on embodiment of this invention is attached to the sliding door of a motor vehicle. It is explanatory drawing which shows the outline of the pinching prevention apparatus provided with the electrostatic capacitance type sensor which concerns on embodiment of this invention. It is a block diagram which shows the outline of the pinching prevention apparatus provided with the electrostatic capacitance type sensor which concerns on embodiment of this invention. It is sectional drawing in the XX line in FIG. 1, (a) is sectional drawing of the electrostatic capacitance type sensor which shows the state before mounting | wearing with a sliding door, (b) The state when mounting | wearing with a sliding door is shown. It is sectional drawing of an electrostatic capacitance type sensor. It is a flowchart which shows the action | operation of the pinching prevention apparatus using the electrostatic capacitance type sensor which concerns on embodiment of this invention. It is a figure which shows the modification of the capacitive type sensor which concerns on embodiment of this invention, (a) is sectional drawing of the capacitive type sensor which shows the state before mounting | wearing with a sliding door, (b) A sliding door It is sectional drawing of the electrostatic capacitance type sensor which shows a state when mounted | worn to. It is a principal part perspective view of the motor vehicle shown in the state installed in the slide door of the conventional electrostatic capacitance type sensor. It is a XX direction expanded sectional view of Drawing 7. It is an electric block diagram which shows the structure of the conventional electrostatic capacitance type sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door drive device 2 Pinching prevention device 3 Capacitance type sensor 3a Mounting part 3b Fitting groove 3c Detection part 4 Sliding door (removal member)
4b Flange 31 First sensor electrode (sensor electrode)
32 Second sensor electrode (sensor electrode)
33, 37 Shield electrode 33b, 38 Core member 36 Cover member

Claims (4)

A pair of sensor electrodes provided apart from each other;
A shield electrode surrounding the sensor electrode in a spaced manner;
A covering member made of an insulating material for holding the sensor electrode and the shield electrode;
A capacitive sensor comprising:
The covering member has a mounting portion for mounting on the mounting member,
The capacitive sensor according to claim 1, wherein a core member having the same potential as that of the shield electrode is provided in the attachment portion.   The capacitive sensor according to claim 1, wherein the core member is integral with the shield electrode.   The capacitive sensor according to claim 1, wherein the shield electrode and the core member are made of a conductive metal. The mounting portion includes a fitting groove for mounting on the mounting member,
The shield electrode opens the detection unit side,
4. The capacitive sensor according to claim 1, wherein the core member and the fitting groove are formed so as to open to the opposite side of the detection unit. 5.

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