JP2000346721A - Catching detector and opening/closing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catching detector having high detection accuracy and an opening/closing apparatus. SOLUTION: A flexible stripe piezoelectric sensor 6 is supported by an window frame 4 at a supporting part 10 in the widthwise direction thereof. When the piezoelectric sensor 6 touches an object M, an abutting part 11 is deformed flexibly and since a widthwise flexure is imparted in addition to a longitudinal flexure, a large deformation is produced and the output signal from the piezoelectric sensor 6 is increased. Since the signal component of catching can be discriminated easily from the signal component of external vibration or electric noise, detection accuracy can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch detection device for detecting a pinch of an object between an opening and an opening / closing portion for opening / closing the opening, and an opening / closing device.

[0002]

2. Description of the Related Art A conventional pinch detection device is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 10-132669. As shown in FIG. 18, a piezo cable 1 made of a high-molecular piezoelectric material such as polyvinylidene fluoride is disposed along a window frame 2 of an automobile, and a window frame 2 and a window glass are formed based on an output signal of the piezo cable 1. 3 is to detect that an object is caught between the object No. 3 and the object No. 3.

[0003]

However, in the conventional pinch detection device, since the piezo cable 1 is disposed along the window frame 2 of the automobile, when a soft object such as a finger is pinched, the window frame 2 is not used. And the deformation of the piezo cable 1 is small. Therefore, it is necessary to increase the amplification factor during signal processing, and it is difficult to distinguish between the original signal component at the time of pinching and the signal component due to extraneous vibration or electrical noise, and the pinch detection accuracy is poor. there were.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an entrapment detection device and an opening / closing device with high detection accuracy.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a band-shaped flexible pressure-sensitive means is provided on at least one of an opening and an opening / closing part, and the pressure-sensitive means has a width. In a part of the direction, there is provided a supporting portion supported by at least one of the opening and the opening / closing portion, and a bendable contact portion that comes into contact with an object. When the pressure sensing means comes into contact with the object, the contact portion is flexibly deformed, and in addition to the bending in the longitudinal direction, the bending in the width direction is added, so that a larger deformation amount than in the past can be obtained and the pressure sensing means can be obtained. The output signal from is increased. for that reason,
It is not necessary to increase the amplification factor in signal processing, and it is easy to distinguish between the original signal component at the time of pinching and the signal component due to extraneous vibration or electrical noise, and the pinching detection accuracy can be improved.

[0006]

According to the first aspect of the present invention, there is provided a pressure sensitive device having a belt-shaped flexible member disposed on at least one of an opening and an opening / closing portion. Is provided with a support part supported by at least one of the opening part and the opening / closing part in a part in the width direction, and a flexible contact part that comes into contact with an object. When the pressure sensing means comes into contact with the object, the contact portion is flexibly deformed, and in addition to the bending in the longitudinal direction, the bending in the width direction is added, so that a larger deformation amount than in the past can be obtained and the pressure sensing means can be obtained. The output signal from is increased. Therefore, it is not necessary to increase the amplification factor during signal processing, and it is easy to distinguish between the original signal component at the time of pinching and the signal component due to extraneous vibration or electrical noise, and the pinching detection accuracy can be improved. .

According to a second aspect of the present invention, the contact portion is formed by curving the whole in the width direction so that the contact surface with the object is convex, and the support portions are provided at both ends in the width direction. The contact portion is widened, and the detection accuracy can be further improved.

According to a third aspect of the present invention, a plurality of abutting portions are formed by curving the whole at the center in the width direction to form a C-shape, and a supporting portion is provided at the center in the width direction. Similarly, the contact portion is widened, and the detection accuracy can be further improved.

According to a fourth aspect of the present invention, the pressure sensing means includes an elastic body around the contacting portion to protect the contacting portion, and the contacting portion is protected by the elastic body, so that the durability is improved. be able to.

According to a fifth aspect of the present invention, the pressure sensing means includes a deformation restricting portion for restricting deformation of the contact portion, and excessive deformation of the contact portion is limited by the deformation restricting portion. Can be improved.

According to a sixth aspect of the present invention, the pressure sensing means comprises a piezoelectric sensor formed by mixing a rubber elastic organic base material with a sintered powder of a piezoelectric ceramic, molding the mixture, and performing polarization processing. Durability can be improved.

According to a seventh aspect of the present invention, there is provided the entrapment detection device according to any one of the first to seventh aspects, wherein the opening / closing operation of the opening / closing portion is performed so as to cancel the entrapment when the entrapment is determined based on the output signal of the judging means. Since it has a control means for controlling, it is possible to accurately determine the entrapment and release the entrapment during the entrapment, so that unnecessary entrapment can be prevented.

According to the eighth aspect of the present invention, since the opening / closing portion is a power window or an electric sunroof of an automobile, it is possible to prevent unnecessary entrapment between the power window and the electric sunroof.

According to the ninth aspect of the present invention, since the opening / closing section is an automatic door of an automobile building, unnecessary pinching by the automatic door can be prevented.

[0015]

1 to 1 show an embodiment of the present invention.
This will be described with reference to FIG.

(Embodiment 1) The invention of Embodiment 1 will be described with reference to FIGS.

FIG. 1 is an external view of a pinch detection device and an opening / closing device according to the first embodiment of the present invention, which is applied to a power window of an automobile. FIGS. 2A and 2B show FIG.
2A is a cross-sectional configuration view at the position AA ′, wherein FIG. 2A shows a state where the object M is not sandwiched, and FIG. 2B shows a state where the object M is sandwiched.

First, the configuration of the pinch detection device according to the first embodiment of the present invention is as follows. In FIG. 1, reference numeral 4 denotes a window frame as an opening, and reference numeral 5 denotes a window glass as an opening / closing unit. A piezoelectric sensor 6 as a pressure-sensitive means is disposed on the periphery of the window frame 4. 7 is a window frame 4 based on an output signal of the piezoelectric sensor 6.
The judging means judges whether an object is caught between the door and the window glass 5, and is provided in the door main body near the side mirror mounting position of the door.

The opening and closing device according to the first embodiment of the present invention comprises the above-described pinch detection device, a power window driving device 8 for opening and closing the window glass 5, and control means 9 for controlling the power window driving device 8. Here, the power window driving device 8 includes a motor 8a, a wire 8b, a support 8c for the window glass 5, a guide 8d, and the like. The wire 8b is moved by the motor 8a, and the support 8c connected to the wire 8b
Is moved up and down along the guide 8d so that the window glass 5
Open and close. The power window driving device 8 is not limited to the above-described system using wires, but may be another system. The control means 9 includes a motor 8a
And may be integrated.

As shown in FIGS. 2A and 2B, the piezoelectric sensor 6 comprises a support portion 10 and a contact portion 11, and the support portion 10 is fitted into a slot 12 formed in the window frame 4. Is supported by the window frame 4. When the object M is interposed between the window frame 4 and the window glass 5 as shown in FIG. 12 is a weather strip.
The contact portion 11 is supported by the window frame 4 so as to be substantially parallel to the direction in which the window glass 5 opens and closes. 2 (a) and 2 (b)
In the figure, the left side of the window glass 5 is the vehicle interior, and the right side is the vehicle exterior.

FIGS. 3A and 3B are external views of the piezoelectric sensor 6. FIG. 3A illustrates a state where the object M is not sandwiched, FIG. 3B illustrates a state where the object M is sandwiched, and FIG. 3B illustrates a state where the piezoelectric sensor 6 illustrated in FIG. FIG. 2 is a view as viewed from the vehicle interior side. The piezoelectric sensor 6 includes a piezoelectric layer 1 in which a sintered ceramic powder is mixed with a rubber elastic organic base material.
4 and the flexible electrodes 15 and 16 are laminated, and the support portion 110 for supporting the window frame 4 is formed by the piezoelectric layer 14 and the electrode 1.
5 and 16 are formed by being fixedly adhered to one end of each of them and molded and polarized, and have excellent flexibility and generate an output signal corresponding to the deformation. As the rubber elastic body, for example, chlorinated polyethylene is used, and as the piezoelectric ceramic, for example, a sintered powder of lead zirconate titanate is used. Electrodes 15, 16
For example, silver paste or conductive rubber is used. The support portion 10 is made of an elastic member such as rubber, and the slot portion 12 of the window frame 4 is formed.
It is possible to fit in. A protective layer such as a resin film or a rubber sheet may be further provided on the electrodes 15 and 16, or a shield layer for electrical shielding may be further provided thereon.

The judging means 7 is directly mounted on the end of the piezoelectric sensor 6 as shown in FIG. Therefore, a lead wire or a connector for connecting between the piezoelectric sensor 6 and the judging means 7 becomes unnecessary. Further, the judging means 7 is disposed in the door body near the side mirror mounting position as shown in FIG. 1, and the piezoelectric sensor 6 is not extended and disposed at a place other than the window frame 4, so that the window is not provided. Unnecessary vibrations are not sensed outside the frame 4. The judging means 7 has a built-in FET for converting the impedance of the output signal of the piezoelectric sensor 6, an operational amplifier for amplifying the signal, a signal processing circuit for entrapment judging described later, and the like. A charge amplifier circuit may be used instead of the FET. In order to remove extraneous electrical noise, the entire judging means 7 may be covered with a shield member to be electrically shielded, or a through-capacitor, an EMI filter, or the like may be added to the input / output section of the circuit.

Next, the operation will be described. When the object M is sandwiched between the window frame 4 and the window glass 5, the piezoelectric sensor 6 comes into contact with the object M, and the contact portion 11 is bent and largely deformed as shown in FIG. FIG. 4 is a characteristic diagram showing the output signal V from the piezoelectric sensor 6, the determination output J of the determination means 7, and the voltage Vm applied to the motor 8a at this time. Motor 8 at time t1
The window glass 5 is raised by applying a voltage of + Vd to a.
When the pinching occurs, a signal (a signal component larger than the reference potential V0 in FIG. 4) corresponding to the acceleration of the deformation of the contact portion 11 is output from the piezoelectric sensor 6 due to the piezoelectric effect. At this time, in the conventional pinch detecting device, the deformation of the piezo cable 1 at the time of pinching is only bending in the longitudinal direction, but in the case of the present embodiment, as shown in FIG. 2B and FIG. Since the sensor 6 is provided with a bend in the width direction in addition to the bend in the longitudinal direction, a larger deformation amount than in the related art can be obtained.
The acceleration which is the next differential value also increases, and as a result, the output signal of the piezoelectric sensor 6 also increases.

The determination means 7 determines the amplitude | V-V of V from V0.
If 0 | is greater than or equal to D0, it is determined that pinching has occurred, and at time t2, a pulse signal of Lo → Hi → Lo is output as a determination output. When this pulse signal is received, the control means 9 stops applying the voltage of + Vd to the motor 8a, applies the voltage of -Vd for a certain time, lowers the window glass 5 by a certain amount, and releases the pinch. At the time of releasing the entrapment, the piezoelectric sensor 6 outputs a signal (a signal component smaller than the reference potential V0 in FIG. 4) corresponding to the acceleration at which the deformation of the contact portion 11 is restored.

At the time of pinching, whether V is larger or smaller than V0 depends on the bending direction and the polarization direction of the piezoelectric sensor 6, the assignment of electrodes (which is the reference potential), the piezoelectric sensor 6
However, since the determination means 7 determines the entrapment based on the amplitude of V from V0, the determination means 7
Entrapment can be determined regardless of the magnitude of 0.

According to the pinch detecting device of the first embodiment, when the piezoelectric sensor 6 (pressure sensing means) comes into contact with an object, the contact portion 11 is flexibly deformed and a large amount of deformation is obtained. The output signal from the sensor 6 (pressure sensing means) increases. Therefore, it is not necessary to increase the amplification factor during signal processing as in the past, and it is easy to distinguish between the original signal component at the time of pinching and the signal component due to extraneous vibration or electrical noise, improving the detection accuracy of pinching. There is an effect that can be done.

A conventional pinch detecting device is a piezo cable 1 made of a piezoelectric polymer material such as polyvinylidene fluoride.
Is used, the sensitivity decreases due to depolarization at high temperatures, but according to the entrapment detection device of Example 1,
Since the piezoelectric sensor 6 (pressure-sensitive means) is formed by mixing and shaping a piezoelectric ceramic sintered powder with an organic base material of a rubber elastic body and performing polarization processing, the effect of improving high-temperature durability can be obtained. is there.

Further, according to the opening / closing device of the first embodiment, the pinching is accurately judged by the judging means 7 and the motor 8a is controlled by the control means 9 to lower the window glass 5 to release the pinching. There is an effect that unnecessary pinching can be prevented.

Further, according to the opening / closing device of the first embodiment, it is possible to prevent unnecessary entrapment in the power window (opening / closing portion) of the door of the automobile.

Although the piezoelectric sensor 6 is supported by the window frame 4 in the above embodiment, the piezoelectric sensor 6 may be supported by the window glass 5 as shown in FIGS. 5 (a) and 5 (b). Here, FIG. 5A shows a state in which the object M is not sandwiched, and FIG. 5B shows a state in which the object M is sandwiched. It is. According to this configuration, when the object M is sandwiched between the window frame 4 and the window glass 5, as shown in FIG.
Is bent and greatly deformed.
Is determined by the control means 9 and the motor 8
a is reversed and the window glass 5 is lowered to release the pinch. Here, usually, when an object is sandwiched, the object M
Touches the window glass 5 side before contacting the window frame 4 side, rises together with the window glass 5 and is sandwiched by the window frame 4, but according to the configuration in which the piezoelectric sensor 6 is supported by the window glass 5, Is determined to be a pinch when it comes into contact with the piezoelectric sensor 6, and the window glass 5 can be lowered to release the pinch, so that unnecessary pinching as a switchgear can be further prevented.

As shown in FIGS. 6A and 6B, the piezoelectric sensor 6 may be provided with an elastic body 17 around the contact portion 11 for protecting the contact portion 11. Here, FIG.
6 shows a state in which the object M is not sandwiched, and FIG. 6B shows a state in which the object M is sandwiched.
It is sectional drawing in the -A 'position. According to this configuration, even if the object M is sandwiched between the window frame 4 and the window glass 5 as shown in FIG. 6B, the contact portion 11 is protected by the elastic body 17, so that the piezoelectric sensor 6 While suppressing excessive deformation, wear and damage of the piezoelectric sensor 6 can be prevented, and the durability of the piezoelectric sensor 6 can be improved.

In the above configuration, the contact portion 11 is supported by the window frame 4 so as to be parallel to the surface of the window glass 5. However, the present invention is not limited to such a support configuration. Any configuration may be used as long as 11 is bent and greatly deformed. For example, as shown in FIGS. 7A and 7B, the contact portion 11 may be supported by the window frame 4 so as to be perpendicular to the surface of the window glass 5. Here, FIG. 7A shows a state in which the object M is not sandwiched, and FIG. 7B shows a state in which the object M is sandwiched. It is. According to this configuration, since there are few protrusions in the vertical direction from the window frame 4, the appearance is good in design.

The piezoelectric sensor 6 may be supported on the outside of the window frame 4 or on both the inside and outside of the window frame 4. Further, the structure may be such that it is supported by the weather strip 12 or the side sun visor.

(Embodiment 2) The invention of Embodiment 2 will be described with reference to FIGS.

FIGS. 8 (a) and 8 (b) are cross-sectional views of the pinch detecting device and the opening / closing device according to the second embodiment of the present invention.
-A 'position. Here, FIG. 8A illustrates a state in which the object M is not sandwiched, and FIG. 8B illustrates a state in which the object M is sandwiched. The difference between the second embodiment and the first embodiment is that, as shown in FIGS. 8A and 8B, the support portions 10a and 10b are provided at both ends of the piezoelectric sensor 6 as pressure sensing means.
And a slot 12 formed in the window frame 4 as an opening
a, 12b to support it, and to support the object M except for the both ends.

FIG. 9 is an external view of the piezoelectric sensor 6. The piezoelectric sensor 6 is formed by laminating a piezoelectric layer 18 and flexible electrodes 19 and 20, and bending the whole in the width direction so that the contact surface with the object M is a convex surface to form the contact portion 11. Are provided with support portions 10a and 10b at both ends. Piezoelectric layer 18 and electrode 1
9 and 20, and the supporting portions 10a and 10b are made of the same material as in the first embodiment. The configuration other than the above is the same as that of the first embodiment, and a detailed description is omitted.

With the above configuration, according to the pinch detection apparatus of the second embodiment, when the object M is pinched between the window frame 4 and the window glass 5, the piezoelectric sensor 6 comes into contact with the object M, and FIG.
As shown in (b), the contact portion 11 is bent and largely deformed. At this time, since the contact surface between the piezoelectric sensor 6 and the object M is wider than in the first embodiment, there is an effect that the detection accuracy can be further improved.

In the above embodiment, the piezoelectric sensor 6 is supported by the window frame 4. However, as shown in FIGS. 10A and 10B, the piezoelectric sensor 6 may be supported by the window glass 5. There is a similar effect. Here, FIG.
10B shows a state in which the object M is not pinched, and FIG. 10B shows a state in which the object M is pinched.
FIG. 3 is a cross-sectional configuration diagram at a position.

Further, as shown in FIGS. 11A and 11B, the piezoelectric sensor 6 may be provided with a deformation restricting portion 21 for restricting the deformation of the contact portion 11 inside the curved portion. Here, FIG. 11A shows a state in which the object M is not sandwiched,
FIG. 11B shows a state in which the object M is sandwiched, and is a cross-sectional configuration diagram at the position AA ′ in FIG. According to this configuration, as shown in FIG.
Even if the object M is sandwiched between the window glass 5 and the window glass 5, excessive deformation of the contact portion 11 is limited by the deformation limiting portion 21, so that durability can be improved.

(Embodiment 3) The invention of Embodiment 3 will be described with reference to FIGS.

FIGS. 12 (a) and 12 (b) are cross-sectional structural views of the pinch detecting device and the opening / closing device according to the third embodiment of the present invention, and correspond to the position AA 'in FIG. Here, FIG. 12A shows a state in which the object M is not sandwiched, and FIG. 12B shows a state in which the object M is sandwiched. Embodiment 3 is different from Embodiments 1 and 2 in that, as shown in FIGS. 12A and 12B, a piezoelectric sensor 6 as a pressure sensing means includes a plurality of contact portions 1.
1a and 11b.

FIG. 13 is an external view of the piezoelectric sensor 6. The piezoelectric sensor 6 includes a piezoelectric layer 22 and flexible electrodes 23 and 24.
And a plurality of contact portions 11a and 11b are formed by curving the whole in the shape of a C at the center in the width direction, and the support portion 10 is provided at the center in the width direction. Piezoelectric layer 22 and electrode 2
3 and 24 use the same material as in the first embodiment. The configuration other than the above is the same as that of the first embodiment, and a detailed description is omitted.

With the above configuration, according to the pinch detection apparatus of the third embodiment, when the object M is pinched between the window frame 4 and the window glass 5, the piezoelectric sensor 6 comes into contact with the object M, and FIG.
The contact portions 11a and 11b are bent and greatly deformed as shown in FIG. At this time, the piezoelectric sensor 6 has a plurality of contact portions 11a,
11b, the contact surface between the piezoelectric sensor 6 and the object M is wider than in the first embodiment, so that the detection accuracy can be further improved.

In the above embodiment, the piezoelectric sensor 6 is supported by the window frame 4. However, as shown in FIGS. 14A and 14B, the piezoelectric sensor 6 may be supported by the window glass 5. There is a similar effect. Here, FIG.
14 (b) shows a state where the object M is not pinched, and FIG. 14 (b) shows a state where the object M is pinched.
FIG. 3 is a cross-sectional configuration diagram at a position.

In the first to third embodiments, the piezoelectric sensor 6 has one piezoelectric layer. However, the piezoelectric sensor 6 may have a plurality of piezoelectric layers like a bimorph type piezoelectric sensor. FIG. 15 shows an embodiment of the present invention, in which piezoelectric layers 25 and 26, electrodes 27, 28 and
The piezoelectric sensor 6 is formed by laminating the piezoelectric sensors 9. According to this configuration, since the plurality of piezoelectric layers are provided, the sensitivity is improved.

FIG. 16 is an external view of another embodiment of the piezoelectric sensor 6. As shown in FIG.
1 and 32 are laminated, and folded back at the center in the width direction to form the electrode 32.
The supporting portions 10 are brought into close contact with each other, and the piezoelectric layer 30 and the electrodes 31,
The piezoelectric sensor 6 may be configured to be in close contact with both ends of the piezoelectric sensor 32. With this configuration, sensitivity is improved, and the effect of electrical noise can be eliminated because the electrode 31 has a role of a shield.

In the first embodiment, the support portion 10 of the piezoelectric sensor 6 is fitted into the slot 12 provided in the window frame 4 to support the piezoelectric sensor 6 on the window frame 4, but as shown in FIG.
The configuration in which the piezoelectric sensor 6 is supported on the window frame 4 by the clip 33 may be used, and the efficiency of the mounting operation can be improved.

In the above embodiment, the present invention is applied to a power window of an automobile. However, the present invention may be applied to an electric sunroof.

The present invention may be applied to an automatic door of an automobile, a train, an airplane, a building, or an electric shutter of a garage or a store.

The pressure sensing means is not limited to a piezoelectric sensor. For example, another sensor that generates an output signal according to deformation, such as a capacitance type, a pressure sensitive resistance type, or a light transmission amount detection type, may be used. You may.

[0051]

As is clear from the above embodiment, according to the first aspect of the present invention, at least one of the opening and the opening / closing portion is provided with a band-shaped flexible pressure-sensitive means, and the pressure-sensitive means is provided. The means includes a support portion supported by at least one of the opening and the opening / closing portion in a part of the width direction, and a bendable contact portion that comes into contact with the object. Since it is flexibly deformed, and bends in the width direction are added in addition to the bends in the longitudinal direction, a larger amount of deformation than before can be obtained and the output signal from the pressure-sensitive means increases. Therefore, it is not necessary to increase the amplification factor during signal processing, and it is easy to distinguish between the original signal component at the time of pinching and the signal component due to extraneous vibration or electrical noise, and the pinching detection accuracy can be improved. There is such an effect.

According to the second aspect of the present invention, the contact portion is formed by bending the whole in the width direction so that the contact surface with the object is convex, and the support portions are provided at both ends in the width direction. There is an effect that the contact portion is widened and the detection accuracy can be further improved.

According to a third aspect of the present invention, a plurality of abutting portions are formed by curving the whole in a C-shape at the center in the width direction, and a supporting portion is provided at the center in the width direction. Similarly, there is an effect that the contact portion is widened and the detection accuracy can be further improved.

According to a fourth aspect of the present invention, the pressure sensing means includes an elastic body around the contacting portion to protect the contacting portion. The contacting portion is protected by the elastic body, so that the durability is improved. There is an effect that can be.

According to a fifth aspect of the present invention, the pressure sensing means includes a deformation restricting portion for restricting deformation of the contact portion, and excessive deformation of the contact portion is limited by the deformation restricting portion. Is improved.

According to a sixth aspect of the present invention, there is provided a piezoelectric sensor in which the pressure-sensitive means is constituted by mixing a rubber-elastic organic base material with a sintered powder of a piezoelectric ceramic, molding the mixture, and performing polarization processing. There is an effect that durability can be improved.

According to a seventh aspect of the present invention, there is provided the entrapment detecting device according to any one of the first to seventh aspects, wherein the opening and closing operation of the opening / closing portion is performed so as to cancel the entrapment when the entrapment is determined based on the output signal of the judging means. It has a control means for controlling, and has the effect that it is possible to accurately determine the entrapment and to release the entrapment during the entrapment, thereby preventing unnecessary entrapment.

Further, since the opening / closing portion is a power window or an electric sunroof of an automobile, an unnecessary pinch between the power window and the electric sunroof can be prevented.

According to the ninth aspect of the present invention, since the opening / closing section is an automatic door of an automobile, a train, an airplane, or a building, there is an effect that unnecessary pinching by the automatic door can be prevented.

[Brief description of the drawings]

FIG. 1 is an external view of a pinch detection device and an opening / closing device according to a first embodiment of the invention;

FIG. 2A is a cross-sectional configuration view taken along the line AA ′ in FIG. 1 when the object M is not sandwiched. FIG. 2B is a sectional view taken along the line AA ′ in FIG. 1 when the object M is sandwiched. Cross-sectional configuration diagram

FIG. 3A is an external view of a piezoelectric sensor in a state where an object M is not sandwiched in the same device. FIG. 3B is an external view of a piezoelectric sensor in a state where an object M is sandwiched in the same device.

FIG. 4 is a characteristic diagram showing an output signal V from a piezoelectric sensor of the apparatus, a determination output J of a determination unit, and a voltage Vm applied to a motor.

FIG. 5A is a cross-sectional view showing a state in which an object M is not sandwiched when the piezoelectric sensor of the device is supported on a window glass. FIG. 5B is an object when the piezoelectric sensor of the device is supported on a window glass. Cross-sectional configuration diagram in a state where M is sandwiched

FIG. 6 (a) is a cross-sectional configuration diagram in a state where the object M is not sandwiched when the piezoelectric sensor of the device has an elastic body around the contact portion to protect the contact portion. Cross-sectional configuration diagram in a state in which an object M is sandwiched when the piezoelectric sensor includes an elastic body that protects the contact portion around the contact portion

FIG. 7A is a cross-sectional view of a state in which an object M is not sandwiched when the contact portion of the device is supported by a window frame so as to be perpendicular to a surface of a window glass. Cross-sectional configuration diagram in a state where an object M is sandwiched when the contact portion is supported by a window frame so as to be perpendicular to the surface of the window glass

FIG. 8A is a cross-sectional configuration view of the pinch detection device and the opening / closing device according to the second embodiment of the present invention in a state where the object M is not pinched; Cross-sectional configuration diagram in a state where M is sandwiched

FIG. 9 is an external view of a piezoelectric sensor of the device.

FIG. 10A is a cross-sectional configuration diagram in a state where an object M is not sandwiched when the piezoelectric sensor of the device is supported on a window glass. FIG. 10B is an object when the piezoelectric sensor of the device is supported on a window glass. Cross-sectional configuration diagram in a state where M is sandwiched

FIG. 11A is a cross-sectional view of a state in which the object M is not sandwiched when the piezoelectric sensor includes a deformation restricting portion that restricts deformation of the contact portion inside a curved inside of the piezoelectric sensor. Cross-sectional configuration diagram in a state where an object M is sandwiched when a deformation limiting portion that limits deformation of the contact portion is provided inside

FIG. 12 (a) is a cross-sectional view of a state in which an object of the pinch detection device and the opening / closing device according to the third embodiment of the invention is not pinched; and (b) an object of the pinch detection device and the opening / closing device according to the third embodiment of the invention. Cross-sectional configuration diagram in a sandwiched state

FIG. 13 is an external view of a piezoelectric sensor of the device.

FIG. 14A is a cross-sectional view of a state where an object M is not sandwiched when the piezoelectric sensor of the device is supported on a window glass; FIG. 14B is a diagram illustrating an object when the piezoelectric sensor of the device is supported on a window glass; Cross-sectional configuration diagram in a state where M is sandwiched

FIG. 15 is an external view of another embodiment of the piezoelectric sensor.

FIG. 16 is an external view of another embodiment of the piezoelectric sensor.

FIG. 17 is another configuration diagram of supporting a piezoelectric sensor on a window frame.

FIG. 18 is an external view of a conventional pinch detection device.

[Explanation of symbols]

 Reference Signs List 4 window frame (opening part) 5 window glass (opening / closing part) 6 piezoelectric sensor (pressure sensing means) 7 determination means 9 control means 10 support parts 10a, 10b support part 11 contact part 11a, 11b contact part 17 elastic body 21 Deformation limit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Koji Yoshino 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor: Yu Fukuda 1006, Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 1006 Kadoma, Kadoma Matsushita Electric Industrial Co., Ltd. GB06 GC06 GD03 HA01 KA13 KA15 3D127 AA02 BB01 CB05 CC05 DF04 DF35

Claims (9)

[Claims] An opening, an opening / closing unit for opening and closing the opening, and a belt-shaped flexible member disposed at at least one of the opening and the opening / closing unit for generating an output signal according to deformation. Pressure sensing means, and determination means for judging whether an object is caught between the opening and the opening / closing section based on an output signal of the pressure sensing means, wherein the pressure sensing means is provided in a part of the width direction. And a support portion supported by at least one of the opening portion and the opening / closing portion, and a bendable contact portion that contacts the object. 2. The pressure sensing means according to claim 1, wherein the contact portion is formed by curving the whole in the width direction so that the contact surface with the object is convex, and the support portions are provided at both ends in the width direction. Entrapment detection device. 3. The pinching device according to claim 1, wherein the pressure-sensitive means is entirely curved in a C-shape at the center in the width direction to form a plurality of contact portions, and a support portion is provided at the center in the width direction. Detection device. 4. The pinch detection device according to claim 1, wherein the pressure sensing means has an elastic body around the contact portion to protect the contact portion. 5. The pinch detecting device according to claim 1, wherein the pressure sensing means includes a deformation restricting portion for restricting deformation of the contact portion. 6. The pressure sensor according to claim 1, wherein said pressure-sensitive means comprises a piezoelectric sensor formed by mixing a sintered body of piezoelectric ceramic with an organic base material of a rubber elastic body, molding and polarizing. An entrapment detection device as described. 7. An apparatus according to claim 1, further comprising control means for controlling an opening / closing operation of an opening / closing section so as to cancel the entrapment when the entrapment is determined based on an output signal of the judging means. Switchgear. 8. The opening and closing device according to claim 7, wherein the opening and closing unit is a power window or an electric sunroof of an automobile. 9. The switchgear according to claim 7, wherein the switchgear is an automatic door of a car, train, airplane or building.