JP2000321150A - Pinching detection sensor and pinching-preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat resistance property, expansion and contraction property, and flex property, and at the same time facilitate formation by composing a detection sensor by a flexible piezoelectric material that is subjected to polarization treatment by blending the sintering powder of piezoelectric ceramic to the organic based on a rubber elastic body and pinching an object between opening/closing parts that are composed of a traveling member and a contacting member for generating output. SOLUTION: A detection sensor 8 is made of a piezoelectric material, is provided along the end part of window glass 1, and an object touches a pinching detection sensor 8 or pinching vibration is propagated when the object is pinched between the window glass 1 and a window frame 6, thus detecting pinching. The window frame 6 as the contacting member forms an opening/closing part by the window glass 1 and the window frame 6. In this configuration, when the object touches the detection sensor 8, the detection sensor 8 is distorted and a voltage is generated according to the distortion. The generated voltage signal is converted by the impedance conversion part of a contact detection means, thus judging the contact of the object based on a filtering signal from a filtering part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch detection sensor for detecting a pinch of an object in an opening / closing section such as a window or a door, and a pinch prevention device for preventing pinch.

[0002]

2. Description of the Related Art A conventional pinch detection sensor and pinch prevention device of this type are as follows. As a first conventional example, as described in Japanese Patent Application Laid-Open No. Hei 6-33665, the motor is stopped by detecting the entrapment of an object when the window glass rises based on a change in the drive current of the power window motor. Was something.

A second prior art example is disclosed in
As described in Japanese Patent Publication No. 228, a conductor is provided on a fixed portion contact surface that comes into contact with the door when the door is closed, and a change in the capacitance of the conductor is detected to detect the entrapment of an object, thereby closing the door. Was to stop.

A third conventional example is disclosed in Japanese Patent Laid-Open No.
As described in Japanese Patent No. 29425, a pressure-sensitive switch composed of opposing conductive portions is incorporated in a sealing member of a window frame to detect pinching of an object and stop the motor.

A fourth prior art is disclosed in Japanese Patent Application Laid-Open
As described in JP-A-132669, a piezoelectric cable using a polyvinylidene fluoride (PVDF) copolymer as a piezoelectric material is disposed in a window frame, and output is output from the piezoelectric cable to detect pinching of an object. Met.

[0006]

However, the conventional anti-jamming device has the following problems.

In the first prior art, for example, if the object is soft like a human hand or finger, a change in the drive current of the motor is small if the hand or finger only touches the window. In addition, there is a problem that the pinch cannot be detected unless the window rises and a hand or finger is caught between the window and the window frame and the window rise stops.

Further, the second conventional example has a problem that when the conductor is wet due to rain, car washing, or the like, the capacitance of the conductor changes and erroneous detection of entrapment is caused.

In the third conventional example, there is a problem that the contact point of the pressure-sensitive switch is deteriorated due to aging and the contact is poor, and the sealing portion is deformed and the conductive portion is short-circuited. Was.

In a fourth conventional example, an organic polymer material (copolymer) such as polyvinylidene fluoride (PVDF) is used.
Is used as the piezoelectric material, the temperature is high (80 ° C.).
In the above case, the crystal structure changes and the sensitivity changes over time, and the heat resistance itself is low (about 100 ° C.). In addition, since it is configured in a cable shape, the elasticity and flexibility are low, and And it is difficult to arrange (support) it.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pinch detection sensor and a pinch prevention device according to the present invention mix a rubber elastic organic base material with a piezoelectric ceramic sintered powder and perform a polarization treatment. It is made of a flexible piezoelectric material, and is disposed in an opening / closing section composed of a moving member and an abutting member, and generates an output or changes its output when an object is pinched in the opening / closing section. is there.

According to the above invention, the displacement, distortion, and pressure change due to the contact of the object are detected by the pinch detection sensor made of the piezoelectric material, so that even a soft object such as a human hand or finger touches the opening / closing portion. Can be detected.

Further, since the pinch detection sensor made of a piezoelectric material converts distortion generated by contact with an object into an electric signal and outputs the signal, there is no erroneous detection even if the piezoelectric sensor becomes wet due to rain or car washing.

Further, since the pinch detection sensor made of a piezoelectric material does not have a contact such as a pressure-sensitive switch, there is no poor contact or short circuit, and the durability is good.

Further, the piezoelectric material is a flexible material obtained by compounding a sintered powder of a piezoelectric ceramic with an organic base material of a rubber elastic body and subjecting to polarization treatment, and is made of polyvinylidene fluoride (PVDF).
It has higher heat stability and heat resistance, has elasticity and flexibility, and is easier to mold.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The pinch detection sensor according to claim 1 of the present invention is made of a flexible piezoelectric material obtained by blending a piezoelectric ceramic sintered powder with a rubber elastic organic base material and performing a polarization treatment. The opening / closing unit includes a moving member and an abutting member, and generates an output or changes the output when the object is pinched in the opening / closing unit.

Since the pinch detection sensor is made of a piezoelectric material and generates or changes its output due to displacement, distortion, or pressure change due to the contact of the object, the pinch of the object to the opening / closing section can be detected. In addition to being resistant to erroneous detection even when wet and having no contacts, poor contact and short-circuiting are unlikely to occur, and high durability. Since it is a flexible material subjected to polarization treatment, it has higher heat stability and heat resistance than polyvinylidene fluoride (PVDF), has elasticity and flexibility, and is easy to mold.

In the pinch detection sensor according to a second aspect of the present invention, the piezoelectric ceramic is a sintered powder of at least one of lead titanate and lead zirconate titanate.

Further, it is possible to easily realize a pinch detection sensor made of a flexible piezoelectric material.

A pinch detection sensor according to a third aspect of the present invention is one in which a flexible electrode made of conductive rubber is formed on a piezoelectric material.

Since the electrodes are flexible in addition to the piezoelectric material, the elasticity and flexibility of the sandwiching detection sensor as a whole can be increased.

The pinch detection sensor according to claim 4 of the present invention is formed in a sheet shape.

Further, the sheet-like structure has a higher flexibility and is easier to dispose, and the thickness is thin, so that the installation space can be reduced.

A pinch detection sensor according to a fifth aspect of the present invention is disposed along at least one end of the contact member or the moving member.

Since the piezoelectric material has high flexibility and is easy to mold, it can be easily disposed at the end. In addition, since the elasticity is high, the end can be protected for safety.

The pinch detection sensor according to claim 6 of the present invention is disposed on a side visor of the contact member.

Since the heat resistance of the piezoelectric material is high, the piezoelectric material can be provided also in a side visor which can be exposed to direct sunlight and become high in temperature.

In the pinch detection sensor according to a seventh aspect of the present invention, the side visor of the contact member is made of a piezoelectric material.

In addition to the high heat resistance of the piezoelectric material,
Since it has elasticity and flexibility and is easy to mold, it has a degree of freedom in shape, and can also be used as a side visor, thereby reducing the number of parts.

In the pinch detection sensor according to claim 8 of the present invention, the sealing member for sealing the gap when the moving member comes into contact with the contact member is made of a piezoelectric material.

Since the piezoelectric material has elasticity and flexibility and is easy to mold, it has a high degree of freedom in shape, and can also serve as a sealing member, thereby reducing the number of parts.

A pinch detection sensor according to a ninth aspect of the present invention is provided so as to be fitted in an opening / closing portion.

Since the piezoelectric material has a high elasticity and is easy to mold, the fitting structure can be easily realized and the replacement is easy.

An anti-jamming device according to a tenth aspect of the present invention comprises a control means for detecting the jamming of an object in the opening / closing section based on the output of the jagging detection sensor and controlling the opening / closing operation of the opening / closing section. .

An erroneous detection, poor contact, short-circuit, and the like when wet, a high heat resistance, an elasticity and a bendability, and a molding sensor which is easy to mold. Opening and closing operation can be controlled.

An anti-jamming device according to an eleventh aspect of the present invention has a driving means for driving a moving member, and the control means stops driving of the moving member when it detects that an object is jammed in the opening / closing section. The driving means is controlled so as to perform the above operation.

When the pinch is detected, the pinch is not strongly pinched further, and at the same time, the pinch is hard to be damaged because of its elasticity and flexibility.

According to a twelfth aspect of the present invention, there is provided an anti-jamming device having driving means for driving a moving member, wherein the control means switches the moving member when the object is detected to be jammed in the opening / closing portion. The driving means is controlled so as to be driven in the opening direction.

When the entrapment is detected, the opening / closing portion is opened, so that the entrapment is not continued, and at the same time, since it has elasticity and flexibility, the entrapment is hard to be damaged.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an external view of an anti-jamming device according to Embodiment 1 of the present invention. This embodiment shows a case where the opening / closing section is applied to, for example, a power window for a vehicle. In the figure, 1 is a window glass as a moving member, 2 is a crank for moving up and down the window glass 1, and 3 is a crank 2.
The driving means is, for example, a pulse-driven electric motor. Reference numeral 4 denotes, for example, an open / close position detecting unit that counts a pulse signal applied to the drive unit 3 and detects the open / close position of the window glass 1. A control unit 5 controls the driving unit 3 by outputting a pulse signal, for example. Reference numeral 6 denotes a window frame as an abutting member, and an opening / closing portion 7 is formed by the window glass 1 and the window frame 6. Reference numeral 8 denotes a pinch detection sensor made of a piezoelectric material, which is disposed along the edge of the window glass 1 and contacts the pinch detection sensor 8 when the object is pinched between the window glass 1 and the window frame 6. In other words, the trapping is detected by transmitting the trapped vibration.

FIG. 2 is a cross-sectional view of the window glass 1 and the pinch detection sensor 8 at the position AA 'in FIG. A sheet-like pinch detection sensor 8 is provided along the edge 10 of the window glass by the adhesive 9. Entrapment detection sensor 8
A pair of electrodes 12 are formed on both surfaces of a piezoelectric material 11 which has been subjected to polarization treatment by mixing a sintered powder of lead zirconate titanate as a piezoelectric ceramic with an organic base material of a rubber elastic body. Specifically, the piezoelectric material 11 has a particle size of 10 to 10 as a piezoelectric ceramic with respect to chlorinated polyethylene 100 as an organic base material.
300 μm lead zirconate titanate sintered powder 1500
The parts by weight were sufficiently mixed with an open roll device so as to be uniformly dispersed, molded into an arbitrary thickness (for example, 0.5 mm) using a press machine, and electrodes were formed on the front and back surfaces with a conductive paint. The electrode may be a metal foil such as copper or aluminum.
This sheet was processed by a cutter into a shape conforming to the end 10 of the window, and polarized through an electrode surface (for example, the polarization voltage was a DC voltage of 5 to 50 KV / mm).

The mixing ratio between the organic base material and the piezoelectric ceramic, the molding thickness, the magnitude of the polarization voltage, and the like may be appropriately changed depending on the application, and are not limited to the present embodiment. Also, the disposing method may be a double-sided tape or the like without using an adhesive.

FIG. 3 is a configuration diagram of the window glass 1 and the pinch detection sensor 8 before being disposed. A sheet-shaped pinch detection sensor 8 is formed and arranged along the shape of the end 10 of the window glass 1. Reference numeral 13 denotes a lead wire for extracting output from the pair of electrodes 12.

FIG. 4 is an output characteristic diagram of the pinch detection sensor of this embodiment. Assuming that an object (for example, a driver's arm) is pinched between the window glass 1 and the window frame 6 at time t0, the pinch detection sensor generates an output as shown in FIG.

FIG. 5 is a block diagram showing the circuit processing of this embodiment. Contact detection means 14 for detecting contact of an object based on an output signal from a lead wire of the pinch detection sensor 8
Are an impedance conversion unit 15 for converting the impedance of an output signal from the pinch detection sensor 8, a first filtering unit 16 and a second filtering unit 17 for filtering an output signal from the impedance conversion unit 15, and the two filtering units. And a contact determination unit 18 that determines contact of an object based on an output signal from the device. The contact detecting means 14 may be entirely shielded by a metal case or the like in order to shield the signal processing circuit from electrical noise depending on the use environment, installation location, and the like.

Although not shown, the entrapment detection sensor 8
Is connected to a resistor for detecting disconnection / short circuit between the electrodes 12.

FIG. 6 shows an example of a circuit diagram for detecting the disconnection / short circuit. In the figure, Ps is the pinch detection sensor 8, and R1 is a resistor for disconnection detection, which is connected between the pair of electrodes 12 (p1 and p2 in the figure) as described above. R1 is connected to the power supply Vd via another resistor R2. R3 and R4 are resistors for deriving a signal from the pinch detection sensor 8, and Q1 is an FET for impedance conversion.
It is.

Next, the operation and operation will be described with reference to the drawings.

In FIG. 1, for example, when the drive means 3 is started by operating the drive switch of the power window installed in the vehicle in a state where the window glass 1 is below and the opening / closing section 7 is opened, or Assume that an object such as a part of a human body or a bag comes into contact with the pinch detection sensor 8 while the drive means 3 is operating to close the window glass 1. Since the pinch detection sensor 8 is distorted by the contact of the object, the pinch detection sensor 8 generates a voltage as shown in FIG. The generated voltage level changes depending on the magnitude of the distortion at the time of contact and the sensitivity of the pinch detection sensor 8 itself, that is, the piezoelectric constant of the piezoelectric material 11 and the like.

Next, the signal generated from the pinch detection sensor 8 is converted to a low impedance by the impedance conversion section 15 of the contact detection means 14. The impedance-converted signal is filtered by the first filtering unit 16 and the second filtering unit 17. FIG. 7 shows the filtering characteristics of the first filtering section 16 and the second filtering section 17. In the figure, the vertical axis represents power Pw and the horizontal axis represents frequency f. In the figure, when an object comes into contact, particularly when a part of a human body comes into contact, an output signal mainly having low frequency f1 as the center is output from the pinch detection sensor 8. Therefore, the filtering characteristic of the first filtering unit 16 is set to f1. In the case of application to a power window of a vehicle as in the present embodiment, f
2 (> f1) because the vibration of the vehicle itself is superimposed on the pinch detection sensor 8 as a noise component.
In order to catch this component, the filtering unit 17 changes the filtering characteristic to f
It is 2. Next, the contact determination unit 14 determines the contact of the object based on the filtered signals from the two filtering units.

FIG. 8 illustrates the criterion. The horizontal axis is the output signal Vf2 from the second filtering unit 17, and the vertical axis is the output signal Vf1 from the first filtering unit 16. In the figure, when the value of Vf1 / Vf2 is large as in the region D1, it is determined that the object has touched, and when the value of Vf1 / Vf2 is small as in the region D2, it is determined that there is no contact.

FIG. 9 is a judgment flowchart showing the procedure of the above judgment. When the SW of the power window is turned on in step 19, the drive means operates in step 20, Vf1 and Vf2 are calculated in step 21, and step 22
Calculates the ratio r between Vf1 and Vf2. Then step 2
In step 3, r is compared with a predetermined set value r0, and r> r
If it is 0, it is determined in step 24 that there is contact with the object, and in step 25 the driving means is stopped. Step 23
If r> r0 is not satisfied, it is determined in step 26 that there is no contact, and the processing from step 21 is continued until the closing of the window is detected in step 27. The detection of the closing of the window is performed, for example, by detecting that the current value applied to the motor of the driving means at the time of closing the window becomes a certain value or more. In step 25, the driving means may be reversed to lower the window.

In the above description, two filtering units are provided. However, the number of filtering units is not limited to two, and the characteristics and number of the filtering units can be optimized according to an application example so as to detect pinching. is there. In particular, when the output signal level when the object comes into contact with the vehicle is much higher than the level of vibration noise of the vehicle or the like, one filtering unit may be used, or in some cases, the filtering unit may not be used. The value of r may be optimized in advance by experiments or the like in consideration of the vibration characteristics of the vehicle and the like.

As shown in FIG. 6, by applying a voltage between the electrodes via the resistor R1 and monitoring the output VO1, disconnection of the electrodes can be detected. That is, FIG.
In normal operation, VO1 is equal to R
1, the partial pressure values of R2 and R3. Entrapment detection sensor 8
If the point p1 or the point p2 is equivalently opened when the electrode is disconnected, VO1 becomes the partial pressure value of R2 and R3. When the electrodes are short-circuited, equivalently, p1 and p2 are short-circuited, so that V1 becomes 0. As described above, it is possible to detect an abnormality such as a disconnection or a short circuit of the electrode of the pinch detection sensor 8 based on the value of V1, thereby improving the reliability.

With the above operation, the opening / closing operation of the opening / closing section can be stopped when the contact of the object is detected based on the output signal of the pinch detection sensor. In addition, the pinch detection sensor reduces the distortion caused by the contact with the object. Since the signal is converted into a typical signal and output, even if the pinch detection sensor gets wet due to rain, car washing, or the like, no erroneous detection is performed, and pinch can be prevented. Further, since the pinch detection sensor does not have a contact such as a pressure-sensitive switch, it is possible to realize a pinch prevention device with good durability without poor contact or short circuit.

Further, since the sandwiching detection sensor is formed in a thin sheet shape, it can be easily arranged even in a thin shape such as a window glass. Less is needed.

Also, as in the present embodiment, the pinch detection sensor is provided on the moving member side called the window glass.
Since there is no doubt that the contact occurs when the object is pinched, detection errors and detection delays are unlikely to occur. Similarly, in the case of an automobile, the window is positioned lower than the window frame, and when an object is sandwiched, it is considered that the window often comes in contact with the window glass earlier than the window frame. Before being pinched and causing damage to an object, it is possible to detect early by touching only the window glass side, and there is a high possibility of stopping before being pinched, which is safer.

The pinch detection sensor is made of a piezoelectric material in which a piezoelectric ceramic is mixed with a rubber elastic body, and the piezoelectric ceramic has excellent heat resistance against depolarization. Even if it is arranged, the durability is good, and the reliability when detecting contact with an object is improved. Further, since the rubber elastic body is used, the workability is good, and it can correspond to an arbitrary shape.

Since the contact detecting means detects only a specific frequency component generated when the object comes into contact with the signal output from the pinch detection sensor, for example, vibration other than contact with the object, such as vibration due to the opening / closing operation of the opening / closing section or extraneous vibration. The contact signal of the object can be detected by distinguishing the output signal of the pinch detection sensor due to the vibration from the output signal of the contact with the object, and the detection accuracy is improved.

If the output signal indicating whether or not an object has come into contact is made valid only when the open / close position signal output from the open / close position detecting unit is within a predetermined set range, the open / close position exceeds the set range. When the opening / closing section is normally closed, the pinch detection sensor contacts the window frame and a signal is output, and even if the contact detection means detects that there is contact with an object, the detection signal is ignored and the opening / closing section is closed. Operation can be completed.

The pinch detection sensor has a resistor between the electrodes on the tip side of the sensor for detecting disconnection or short circuit of the sensor, and applies a voltage between the electrodes via the resistor to monitor the disconnection of the electrode. And short circuit can be detected, so that the reliability can be improved.

Further, since it is possible to determine an abnormality in the sensitivity of the pinch detection sensor based on a signal output from the pinch detection sensor when the opening / closing section is closed, the reliability in detecting contact with an object is improved.

In the above embodiment, one pinch detection sensor is provided. However, if two pinch detection sensors are provided, for example, the following effects can be obtained.

First, if one is provided in the opening / closing section for detecting the sandwiching and the other is provided for detecting the vibration of the vehicle, the difference between the two outputs is obtained to obtain the output due to the vibration of the vehicle. Can be offset, and the accuracy of pinch detection is improved.

Further, by providing the movable member side and the contacting member side, and stopping the driving of the driving means only when both of them generate the output of pinching, the accuracy of pinching prevention is improved. For example, if the driver's elbow touches the window glass when the window glass starts to rise from the fully opened state, it does not lead to pinching, so there is no need to originally stop the driver. (If it stops, you must press the switch again.)
In such a case, it can be stopped only when it is really pinched, without stopping.

Here, the piezoelectric material of the present invention (the organic base material is a chlorinated polyethylene and the piezoelectric ceramic is a sintered powder of lead zirconate titanate) and a conventional polyvinylidene fluoride (PVD)
In order to compare F), when a person enters the floor for each elapsed time while adjusting the temperature of the piezoelectric material to 100 ° C with a heating element, molding it to the size of about 2 tatami mats each and installing it on the floor Were measured and compared. At this time, the subject weighed 6
At 3 kg, both of the present invention product and the conventional product before heat generation were designed so that the generated voltages upon entering the bed were both 200 mV. The result is shown in FIG. The elapsed time is plotted on the horizontal axis, and the generated voltage is plotted on the vertical axis. The generated voltage a of the piezoelectric material of the present invention has almost flat characteristics with no change with time, but the generated voltage b of the conventional piezoelectric material gradually increases. The voltage drops. That is, the piezoelectric material of the present invention can stably maintain sensitivity for a longer time than the conventional piezoelectric material.

Since a polyvinylidene fluoride film is conventionally used, if it is left at a high temperature of 100 ° C. for a long time, molecular crystals of polyvinylidene fluoride which have been oriented in the direction in which a voltage is generated will be formed. This is presumably because the crystal structure changes due to the disorder and the generated voltage gradually decreases. On the other hand, since the heat resistance of the lead zirconate titanate sintered powder of the present invention is 300 ° C. to 350 ° C., the polarized crystal structure does not change even when left at 100 ° C., and the sensitivity is stable. It is thought that it can be maintained.

Although a sintered powder of lead zirconate titanate was used in this example, the heat resistance was high and the orientation of the crystal structure due to polarization, that is, a voltage was generated in response to a pressure load. What is necessary is just to have a property (piezoelectricity). For example, the same result as described above can be obtained by using a sintered powder of lead titanate.

(Embodiment 2) FIG. 11 is an external view of an anti-jamming device according to Embodiment 2 of the present invention, and FIG.
FIG. In this embodiment, the entrapment detection sensor 8 is provided on a side visor 28 for rain protection.
The side visor 28 attached to the window frame 6 has a hole 29 for fitting, and the piezoelectric material 11 of the pinch detection sensor 8 is provided.
Are provided by fitting the projections 30 provided in the holes 29 into the holes 29.

Since the piezoelectric material 11 is obtained by blending a piezoelectric ceramic sintered powder with a rubber elastic organic base material, flexibility and
It is excellent in elasticity and flexibility, can be fitted even if the shape of the side visor 28 is a curved surface, and can be formed into a complicated shape such as the projection 30 because of easy molding.

If the fitting can be performed as in the present embodiment, the workability of the arrangement is improved. In some cases, it can be replaced.

Further, since the pinch detection sensor is made of a piezoelectric material having high heat resistance, there is no problem even in a position exposed to direct sunlight, such as a side visor, and the pinch detection sensor has an effect of maintaining stable sensitivity to pinch detection.

In this embodiment, since the tip of the piezoelectric material 11 (where the electrode 12 is located) protrudes from the end of the side visor 28, the protruding portion is the most flexible compared to the other portions. And the sensitivity can be improved.

FIG. 13 is a flowchart showing the procedure for judging pinching. When the SW of the power window is turned on in step 31, the opening / closing section is operated by the driving means in the direction of closing in step 32, and in step 33, the output V1 of the pinch detection sensor is detected. Next, at step 34, V1 is compared with a predetermined set value Vs, and V1> V
If it is s, it is determined in step 35 that there is contact with the object, and in step 36, the opening / closing section is operated by the driving means in the opening direction. If it is not V1> Vs in step 34, it is determined in step 37 that there is no contact, and the processing in step 33 and thereafter is continued until the closing of the window is detected in step 38. In step 36, the driving direction is reversed (the window is lowered) by the driving means. In this case, the sandwiched object can be immediately extracted.

(Embodiment 3) FIG. 14 is a sectional view of a main part of an anti-jamming device according to Embodiment 3 of the present invention. This embodiment has a configuration in which the pinch detection sensor 8 also serves as the side visor 28. When the weather strip 39 as a sealing member for sealing the gap when the window comes into contact with the window frame 6 is fitted into the window frame 6 and fixed, the pinch detection sensor 8 (side visor 28) is also held at the same time. is there. The sandwiching detection sensor 8 (side visor 28) has a flexible electrode 12 made of conductive rubber disposed on the piezoelectric material 11 and is bent in this state as shown in FIG.
Covered with 0. The electrodes are protected by the molding material 40 to increase the water resistance, and the use of a molding material of a strong material can also serve as a reinforcement.

According to this embodiment, the entrapment detection sensor 8
Also serves as the side visor 28, so that the number of parts and the assembly process can be reduced.

According to this embodiment, the electrode 12 is formed of flexible conductive rubber, and the pinch detection sensor as a whole has elasticity and bendability, and has a high degree of freedom regarding the shape and arrangement method. Improve dramatically. As shown in FIG. 14 of this embodiment, it is also possible to bend the pinch detection sensor 8 together with the electrode.

(Embodiment 4) FIG. 15 is a sectional view of a main part of an anti-jamming device according to Embodiment 4 of the present invention. This embodiment has a configuration in which the pinch detection sensor 8 also serves as the weather strip 39. In other words, it can be said that the pinch detection sensor 8 (weather strip 39) is provided along the edge of the window frame 6.

According to this embodiment, the entrapment detection sensor 8
Also serves as the weather strip 39, so that the number of parts and the assembling process can be reduced.

According to the present embodiment, the pinch detection sensor 8 is located close to the position where the window glass comes into contact with the window frame, and is located at a position where pressure is likely to be applied when an object is actually pinched. Good pinch detection is possible.

According to the present embodiment, the pinch detection sensor 8 is provided on the window frame 6, but the window frame 6 is generally rigid, and the pinch detection sensor 8 is reinforced.

(Embodiment 5) FIG. 16 is a sectional view of a pinch detection sensor according to Embodiment 5 of the present invention, and FIG. In this embodiment, the pinch detection sensor 8 is provided so as to cover the end 10 of the window glass 1. A hole 41 is partially formed in the window glass 1, and a claw 42 at a position corresponding to the hole 41 and a claw 43 applied to the end portion 10 are formed in the sandwiching detection sensor 8. When arranging, the end 10 of the window glass 1 may be inserted between the claws 42 and 43 so that the claws 42 fit into the holes 41.
Such fitting is easy because the piezoelectric material 11 is flexible.

In this embodiment, the edge 10 of the window glass 1 is covered, so that the edge can be protected. Usually, when the edge of the window glass is formed by cutting, it is very dangerous and some processing (polishing processing or the like) is required. However, by covering with the sandwiching detection sensor 8, the trouble of the conventional processing can be saved. .

(Embodiment 6) FIG. 18 is a sectional view of a pinch detection sensor according to Embodiment 6 of the present invention. A window glass as a moving member is composed of laminated glasses 1a, 1b, and 1c, and holds the sandwiching detection sensor 8 on the laminated glass 1b with the laminated glasses 1a and 1c interposed therebetween. The molding material 40 integrally molds the laminated glass and the sandwiching detection sensor 8. In this embodiment, since many parts of the sandwiching detection sensor 8 are hidden by the laminated glass, they are almost inconspicuous. If the pinch detection sensor 8 is formed in a thin sheet shape (film shape) as shown in FIG. 18, it can be accommodated within the thickness of the window glass, and the finish becomes clear, and there is an effect that the design of the car is hardly damaged.

(Embodiment 7) FIG. 19 is a sectional view of a pinch detection sensor according to Embodiment 7 of the present invention. The pinch detection sensor 8 according to the present embodiment is configured between the weather strip 39 and the window frame 6.
By being fitted, the sandwiching detection sensor 8 is inevitably positioned and fixed. With such a configuration, there is an effect that the mounting operation of the pinch detection sensor 8 is facilitated. In the present embodiment, pressure is applied to the pinch detection sensor via the weather strip 39 due to pinching of the object.

(Eighth Embodiment) FIG. 20 is a sectional view of a pinch detection sensor according to an eighth embodiment of the present invention. The pinch detection sensor 8 of this embodiment is disposed on the weather strip 39.

(Embodiment 9) FIG. 21 is a sectional view of a pinch detection sensor according to Embodiment 8 of the present invention. The pinch detection sensor 8 of this embodiment is disposed on the window frame 6.

(Embodiment 10) FIGS. 22 and 23 are sectional views of a sandwiching detection sensor according to Embodiment 10 of the present invention. FIG.
Reference numeral 2 denotes a mounted state, in which two cable-shaped sandwiching detection sensors 8 are inserted into the gap between the weather strips 39.
This is because the pinch detection sensor 8 is inserted into the space originally provided for the purpose of increasing the flexibility of the weather strip, and it is necessary to perform special processing on the opening and closing portions such as the weather strip 39 and the window frame 6. No mounting work is easy. FIG. 23 is an enlarged cross-sectional view of the cable-shaped pinch detection sensor 8 shown in FIG. As shown in FIG. 23, the sandwiching detection sensor 8 has the piezoelectric material 11 disposed between the center electrode 12a and the outer layer electrode 12b,
To form a coaxial cable. In this case, the outer electrode 12b can also serve as an electric shield layer. Specifically, the pinch detection sensor 8 is formed into a coaxial cable shape by, for example, extruding and tubing a piezoelectric material 11 on a nickel-plated copper core wire-shaped center electrode 12a to cover and form the center electrode 12a.
A copper wire outer electrode 12b may be provided concentrically on 1 and a coating material 44, which is an insulating jacket of vinyl chloride, may be provided outside the outer electrode 12b.

(Embodiment 11) FIG. 24 shows Embodiment 9 of the present invention.
3 is an operation block diagram of the pinch detection sensor of FIG. FIG.
3 also shows a cross section of the pinch detection sensor 8. This embodiment is different from the other embodiments in that the pinch detection sensor 8 is formed by laminating two piezoelectric materials 11a and 11b provided with electrodes 12c and 12d and 12e and 12f, thereby forming the pinch detection sensor 8. Electrodes 12e and 1 of the piezoelectric material 11b
A signal application unit 45 for applying a voltage signal of a specific frequency to 2f to generate vibration is provided, and the contact detection unit 14 is configured to pinch based on an output signal generated between the electrodes 12c and 12d of another piezoelectric material 11a due to the vibration. A pressure calculator 46 for calculating the pressure applied to the detection sensor 8;
Determination unit 4 that determines the contact of an object based on the output signal of
7 is provided. The contact detecting means 14 includes a first band-pass filter 48 having a center frequency of the frequency f3 generated by the signal applying section 45 and a second band-pass filter 49 having a center frequency of f1 in FIG. The outside of the pinch detection sensor 8 may be sealed with a protective layer such as PET or a metal film for electric shielding.

Next, the operation and operation will be described.

In other words, in other embodiments, the entrapment is detected by the output of the entrapment detection sensor, whereas in this embodiment, the entrapment is detected by a change in the output of the entrapment detection sensor. .

In the pinch detection sensor 8, the signal application section 45
Material 11b according to the voltage signal of frequency f3 generated in
Vibrates. Then, a piezoelectric electromotive force is generated in the piezoelectric material 11a according to the vibration. The generated output signal is filtered by a first band pass filter 48. At this time, the signal waveforms of the oscillation signal V3 of the signal application unit 45 and the output V4 of the first bandpass filter 48 are shown in FIGS. 25 (a) and 25 (b), respectively.
become that way. In FIGS. 25A and 25B, the vertical axis represents V3 and V3.
4. The horizontal axis is time t, and it is assumed that the object has come into contact with the pinch detection sensor 8 and the pressure Pr1 has been applied at time t1.
In a state where the object is not in contact (t <t1), the amplitude of V4 is D40. Then, when the object comes into contact at time t1 and the pressure Pr1 is applied to the pinch detection sensor 8, the amplitude of V4 changes to D41. Here, there is a relationship between the amplitude D4 of V4 and the pressure Pr as shown in FIG. 26, and D4 has a characteristic of decreasing as the pressure Pr increases. Since this characteristic changes depending on the oscillation frequency f3, the shape of the piezoelectric materials 11a and 11b, and the like, it may be optimized in advance by experiments or the like according to the application. The pressure calculation unit 46 calculates Pr1 from D41 based on the relationship in FIG. And the contact determination unit 47
If Pr1 is equal to or greater than a certain threshold Pr0, it is determined that the object has touched, and if Pr1 is smaller than Pr0, it is determined that there is no contact with the object. When the contact of the object is detected as described above during the closing operation of the moving member such as the window glass, the closing operation is reversed to prevent the object from being pinched.

According to the above-described operation, for example, when the vibration during running of the vehicle is applied to the pinch detection sensor 8 disposed on the window frame, the piezoelectric sensor 8 detects the vibration and the distortion as in the first embodiment. In this case, it may be difficult to distinguish between the output signal of the pinch detection sensor 8 due to the traveling vibration and the output signal of the pinch detection sensor 8 due to the contact with the object. A signal corresponding to the pressure is output, and the pressure calculation unit 4 of the contact detection unit 14 is output.
Since the contact pressure of the object is detected by 6 and the contact is determined by the contact determination unit 47, the contact of the object can be detected with high accuracy even when the running vibration as described above is applied.

The contact determination section 47 determines that an object has contacted if Pr1 is equal to or greater than a certain threshold Pr0.
The contact of the object may be determined based on the change rate or the variation pattern of the object.

Further, as shown in FIG.
4 includes a second band-pass filter 49 having a center frequency of f1, and a contact determination unit 47 detects contact of an object based on output signals of both the second band-pass filter 49 and the pressure calculation unit 46. It may be configured. The operation of this configuration will be described below. FIG. 25C shows the signal waveform of the output V5 of the second bandpass filter 49. In the figure, the vertical axis is V5, and the horizontal axis is time t. Time t
When an object comes into contact with the pinch detection sensor at 1, the piezoelectric material 1
Vibration at frequency f3 due to the piezoelectric material 11a and vibration near f1 lower than f3 due to contact with an object are applied to 1a, and a signal having a frequency component in which f3 and f1 are superimposed is output from the piezoelectric material 11a. You. On the basis of this output signal, the pressure calculating section 46 performs the first band pass filter 4
8, the pressure Pr is calculated as described above, and the output V5 of the second bandpass filter 49 is, for example, as shown in FIG.
A signal having an amplitude D5 appears at the frequency f1 as shown in FIG.
Then, in the contact determination section 47, for example, a threshold value D5
In the case of 0 or more, it is assumed that an external vibration such as a running vibration of a car is applied to the pinch detection sensor 8 and that P
The contact of the object is determined based on the value of r. D5 is D5
If it is smaller than 0, the change rate and the change pattern of D5 and Pr
Is determined based on at least one of the values of.
Accordingly, the presence or absence of external vibration is determined by the output signal of the pinch detection sensor 8, and the contact determination is performed by switching the threshold value of the contact determination according to the presence or absence of external vibration. Therefore, only the vibration detected by the pinch detection sensor or only the pressure is detected. The detection accuracy is improved as compared with the case of detecting the contact of the object with the.

In the case of a soft and thin object such as clothes, the output signal of the pinch detection sensor 8 is small if the clothes are in contact, and it is difficult to detect the contact, which may lead to pinch. Even when the moving member such as the window glass is in the closed state, it detects that the output Pr or the output V5 fluctuates due to the pulling of the clothes, etc., determines that there is contact with the object, and performs the opening operation of the driving means. Is also good.

Further, another pinch detection sensor is provided in a portion of the window frame or the support of the window frame where the object does not come into contact, and an output signal of the pinch detection sensor for detecting contact and an output signal of the pinch detection sensor are provided. By calculating the difference between the two, a component of extraneous vibration such as running vibration may be removed from the output signal of the detecting piezoelectric sensor, and only the signal due to the contact of the object may be extracted to detect the contact of the object.

(Embodiment 12) FIG. 27 shows Embodiment 1 of the present invention.
2 is a cross-sectional view of the pinch detection sensor No. 2; This embodiment corresponds to a hard-top type vehicle having no window frame at the door. The window frame 6a is formed on the vehicle body side, and the detection sensor 8 is disposed between the weather strip 39 on the window frame 6a. . In the case of the present embodiment, there is an effect that not only the pinching due to the closing operation of the window glass 1 but also the closing operation of the door itself can be detected.

The configurations of the above embodiments are not limited to the configurations described above, but can be partially replaced or combined with the configurations shown in other embodiments. For example, in the case of the embodiment in which the pinch detection sensor is disposed on the window glass with respect to the position of the pinch detection sensor, the window frame, the side visor, and the weather strip are replaced as shown in other embodiments. Alternatively, what is provided at the end may be provided at a position other than the end.
Although several types of electrodes are shown, they may be interchanged. As for the shape, a sheet shape, a cable shape, an integrated type with other components, and the like may be respectively replaced. The same applies to the case of bonding and the case of fitting. Although the effects of the embodiments may be different, the respective configurations are not limited, and an optimum combination may be selected according to the purpose.

In the above-described embodiment, the anti-jamming device using the jamming detection sensor in the power window for a vehicle has been described. However, the anti-jamming device may be used not only for windows but also for doors such as doors and sunroofs. The present invention can be applied to a device in which a gap between the contact member and the moving member changes due to the movement of the moving member, that is, a device in which there is a possibility that an object is sandwiched.

[0102]

As described above, in the pinch detection sensor according to the first aspect of the present invention, the pinch detection sensor is made of a piezoelectric material, and generates or outputs an output by displacement, distortion or pressure change due to contact with an object. Changes, so that it is possible to detect the pinching of an object in the opening / closing part, and it is difficult for erroneous detection to occur even if it gets wet. The material is flexible, which is obtained by compounding a sintered body of piezoelectric ceramic with a rubber elastic organic base material and polarization processing, so it has higher heat stability and heat resistance than polyvinylidene fluoride (PVDF). It has the effect of having elasticity and flexibility and being easy to mold.

Further, since the pinch detection sensor according to the second aspect is a sintered powder of at least one of lead titanate and lead zirconate titanate, the pinch detection sensor is made of a piezoelectric material which is easily flexible. There is an effect that can be realized.

In the pinch detection sensor according to the third aspect of the present invention, since a flexible electrode made of conductive rubber is formed on the piezoelectric material, the electrode is flexible in addition to the piezoelectric material. There is an effect that the elasticity and the flexibility of the entire entrapment detection sensor can be increased.

Further, since the pinch detection sensor according to the fourth aspect of the present invention is formed in a sheet shape, it is more flexible and easy to dispose, and the thickness is reduced, so that the installation space can be reduced. is there.

Further, since the pinch detection sensor according to the fifth aspect of the present invention is disposed along at least one end of the contact member or the moving member, the piezoelectric material has high flexibility and is easy to mold. In addition to being easily disposed at the end, the elasticity is high, so that the end can be protected for safety.

Further, the pinch detection sensor according to claim 6 of the present invention is provided on the side visor of the contact member. However, since the heat resistance of the piezoelectric material is high, the sensor is exposed to direct sunlight outdoors to a high temperature. It can also be placed on side visors that are likely to be.

Further, in the pinch detection sensor according to claim 7 of the present invention, the side visor of the contact member is made of a piezoelectric material. There is an effect that the molding is easy and there is a degree of freedom in the shape, the side visor can also be used, and the number of parts can be reduced.

In the pinch detection sensor according to claim 8 of the present invention, the sealing member for sealing the gap when the moving member comes into contact with the contact member is made of a piezoelectric material. Since it has flexibility and is easy to mold, there is a degree of freedom in its shape, and it can also serve as a sealing member, which has the effect of reducing the number of parts.

Further, the pinch detection sensor according to the ninth aspect of the present invention is disposed by being fitted in the opening / closing section. However, since the piezoelectric material has high elasticity and is easy to mold, a simple configuration can be adopted. This has the effect of being realizable and easy to replace.

Further, the anti-jamming device according to claim 10 of the present invention is provided with control means for detecting the jamming of an object in the opening / closing section based on the output of the jamming detection sensor and controlling the opening / closing operation of the opening / closing section. It is a pinch sensor that is hard to cause false detection, contact failure and short circuit when wet, has high heat resistance, has elasticity and flexibility, and is easy to mold.
There is an effect that the opening / closing operation of the opening / closing section can be controlled by accurately detecting the entrapment.

Further, the anti-jamming device according to claim 11 of the present invention has a driving means for driving the moving member, and the control means drives the moving member when the jamming of the object into the opening / closing portion is detected. The driving means is controlled so as to stop the operation. When the entrapment is detected, the entrapment is not performed any more strongly, and at the same time, it has an elasticity and bendability, so that the entrapment is hardly damaged.

Further, the anti-jamming device according to claim 12 of the present invention has driving means for driving the moving member,
The control means controls the driving means so as to drive the moving member in the opening direction of the opening / closing section when detecting the entrapment of the object in the opening / closing section. At the same time, there is an effect that the sandwiched material is hard to be damaged because of its elasticity and flexibility.

[Brief description of the drawings]

FIG. 1 is an external view of an anti-jamming device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same device at A-A 'position.

FIG. 3 is an external view of a pinch detection sensor and a window glass of the device.

FIG. 4 is a characteristic diagram showing an output of a pinch detection sensor of the device.

FIG. 5 is a block diagram of the apparatus.

FIG. 6 is a circuit diagram for detecting disconnection of the apparatus.

FIG. 7 is a characteristic diagram showing filtering characteristics of a first filtering unit and a second filtering unit of the device.

FIG. 8 is a characteristic diagram showing a criterion for determining contact of an object with an opening / closing unit of the apparatus.

FIG. 9 is a flowchart showing the operation of the apparatus.

FIG. 10 is a characteristic diagram comparing changes in generated voltage of a piezoelectric material of the device and a conventional piezoelectric material with respect to elapsed time.

FIG. 11 is an external view of an anti-jamming device according to a second embodiment of the present invention.

FIG. 12 is a cross-sectional view of the same device at the position B-B ′.

FIG. 13 is a flowchart showing the operation of the apparatus.

FIG. 14 is a cross-sectional view illustrating a main part of an anti-jamming device according to a third embodiment of the present invention.

FIG. 15 is a cross-sectional view illustrating a main part of an anti-jamming device according to a fourth embodiment of the present invention.

FIG. 16 is a cross-sectional view illustrating a main part of an anti-jamming device according to a fifth embodiment of the present invention.

FIG. 17 is an external view of a pinch detection sensor and a window glass of the device.

FIG. 18 is a cross-sectional configuration diagram of a main part of an anti-jamming device according to a sixth embodiment of the present invention.

FIG. 19 is a cross-sectional view illustrating a main part of an anti-jamming device according to a seventh embodiment of the present invention.

FIG. 20 is a cross-sectional configuration view of a main part of an anti-jamming device according to an eighth embodiment of the present invention.

FIG. 21 is a cross-sectional view illustrating a main part of an anti-jamming device according to a ninth embodiment of the present invention.

FIG. 22 is a cross-sectional view illustrating a main part of an anti-jamming device according to a tenth embodiment of the present invention.

FIG. 23 is a sectional view of a pinch detection sensor of the device.

FIG. 24 is an operation block diagram of an anti-jamming device according to an eleventh embodiment of the present invention.

25A is a waveform characteristic diagram of an oscillation signal V3 of a signal applying unit of the same device. FIG. 25B is a waveform characteristic diagram of an output V4 of a first band-pass filter. Waveform characteristic diagram showing output waveform

FIG. 26 shows the output V of the first band pass filter of the device.
4 is a characteristic diagram showing the relationship between the amplitude D4 of FIG. 4 and the pressure Pr.

FIG. 27 is a sectional view showing a main part of an anti-jamming device according to a twelfth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Window glass (moving member) 1a, 1b, 1c Laminated glass (moving member) 3 Driving means 5 Control means 6, 6a Window frame (contact member) 7 Opening / closing part 8 Pinching detection sensor 10 End part 11, 11a, 11b Piezoelectric Material 12 Electrode 28 Side visor 39 Weather strip (sealing member)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 3/24 C08L 21/00 C08L 21/00 E05F 15/20 E05F 15/20 B60J 1/17 A (72 Inventor Biao Nagai 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Masahiko Ito 1006 Odaka Kazuma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 1006 Kadoma, Ichidai-ji Matsushita Electric Industrial Co., Ltd. GB13 GD03 GD09 HA01 KA13 LA08 3D127 AA02 AA19 BB01 CB01 CB05 CC05 DD12 DE12 DE25 DE27 DF01 DF04 DF08 DF35 DF36 EE15 EE16 EE20 EE27 FF06 FF08 FF14 FF29 GG00 GG07 4J002 AC001 DE186 GM00 GN00 GQ00

Claims (12)

[Claims] An opening / closing unit comprising a flexible piezoelectric material obtained by mixing a piezoelectric ceramic sintered powder with a rubber elastic organic base material and subjecting to polarization processing, and comprising a moving member and a contact member. And a pinch detection sensor that generates an output or changes its output when the object is pinched in the opening / closing section. 2. The pinch detection sensor according to claim 1, wherein the piezoelectric ceramic is a sintered powder of at least one of lead titanate and lead zirconate titanate. 3. The pinch detection sensor according to claim 1, wherein a flexible electrode made of conductive rubber is formed on the piezoelectric material. 4. The pinch detection sensor according to claim 1, wherein the pinch detection sensor is formed in a sheet shape. 5. The device according to claim 1, wherein the contact member or the moving member is disposed along at least one end of the moving member.
An entrapment detection sensor according to the item. 6. The pinch detection sensor according to claim 1, wherein the pinch detection sensor is provided on a side visor of the contact member. 7. The pinch detection sensor according to claim 1, wherein the side visor of the contact member is made of a piezoelectric material. 8. The pinch detection sensor according to claim 1, wherein the sealing member for sealing a gap when the moving member contacts the contact member is made of a piezoelectric material. 9. The pinch detection sensor according to claim 1, wherein the pinch detection sensor is disposed so as to be fitted in the opening / closing section. 10. A pinch comprising a control means for detecting a pinch of an object in the opening / closing section based on an output of the pinch detection sensor according to claim 1 and controlling an opening / closing operation of the opening / closing section. Prevention device. 11. A driving unit for driving a moving member, wherein the control unit controls the driving unit so as to stop driving the moving member when an object is detected to be caught in the opening / closing unit. The anti-jamming device according to claim 10. 12. A driving unit for driving a moving member, wherein the control unit controls the driving unit to drive the moving member in a direction in which the opening / closing portion opens when an object is detected to be caught in the opening / closing portion. The anti-jamming device according to claim 10, wherein: