JP2007005110A - Terminal connection part and terminal connection method of pressure-sensitive sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in case a pressure-sensitive sensor 1 of a cable shape is connected to a coaxial cable 11, it is hard to position center electrodes 2, 12 in opposition, or it takes time for winding or the like of an insulating tape 2. <P>SOLUTION: Since terminal parts 6, 16 of both the pressure-sensitive sensor 1 and the coaxial cable 11 are put adjacent to each other so that an extension direction of their center axes be almost in the same direction, positioning at the time of soldering of each center electrode with the other is made easy. Further, since an end of the terminal connection part 35 is open-ended, a process of conducting between the center electrodes 2, 12 or between outer electrodes 4, 14, or even a process of securing insulation between the center electrodes 2, 12 and the outer electrodes 4, 14 are easily carried out, so that automatization is easy and rationalization of works is easier than in a conventional structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a terminal connection portion and a terminal connection method of a pressure sensor that connect a cable-shaped pressure sensor to a coaxial cable.

  Conventional techniques for connecting a cable-shaped pressure sensor to a coaxial cable include the following. FIG. 3 shows a structural diagram of a connecting portion according to the prior art in the order of processing steps. In step 1 of FIG. 3, the pressure sensor 1 is formed by coaxially forming a center electrode 2, a pressure sensitive layer 3, an outer electrode 4, and a covering layer 5. The coaxial cable 11 includes a center electrode 12, an insulating layer 13, an outer electrode 14, and a jacket layer 15. In this step, the center electrodes 2 and 12 are connected to each other by soldering at the connection portion 20. Next, in step 2, the insulating tape 21 is wound on the vicinity of the soldering portion. In step 3, a conductive tape 22 that connects the outer electrodes 4 and 14 is wound on the insulating tape 21. Further, in step 4, the heat-shrinkable tube 23 inserted in advance in the pressure-sensitive sensor 1 or the coaxial cable 11 covers the conductive tape 22 and is thermally processed. Thereby, the heat shrinkable tube 23 is in close contact with the covering layer 5 and the covering layer 15, and the connection portion 20 is sealed.

In general, there are some which are processed in a dedicated facility such as a cable factory using a dedicated connector (see Patent Document 1).
JP 2001-176623 A

  However, in the case where connection work using a connector is not performed in a dedicated factory, in the above-described conventional connection portion 20, when the center electrodes 2 and 12 are soldered to each other, the center electrodes 2 and 12 face each other. It was necessary and positioning was difficult.

  Further, since the center electrodes 2 and 12 have a small outer diameter, winding the insulating tape 21 around the center electrode is a troublesome work, and the winding may be loosened and the insulating tape 21 may be displaced to impair insulation properties. There was also.

  Further, in order to seal the outermost layer of the connecting portion 20 with the heat shrinkable tube 23, there is a trouble that the heat shrinkable tube 23 must be inserted into the pressure-sensitive sensor 1 or the coaxial cable 11 in advance. It was.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a terminal connection portion that does not require time and effort for connecting a pressure-sensitive sensor to a coaxial cable.

  In order to solve the conventional problem, since the terminal portions are adjacent to each other so that the extending directions of the central axes in the terminal portions of both the pressure sensor and the coaxial cable are substantially the same direction, for example, the center electrodes Positioning during soldering becomes easy. In addition, since one end of the terminal connection part is an open end, it is easy to carry out the process of making the center electrodes or the outer electrodes conductive, the process of ensuring insulation between the center electrode and the outer electrode, etc., and easy to mechanize It is possible and the work can be streamlined more than the conventional configuration.

  Since the terminal connection part of the pressure-sensitive sensor of the present invention is such that the terminal parts are adjacent to each other so that the extension direction of the central axis in the terminal part of both the pressure-sensitive sensor and the coaxial cable is substantially the same direction. Positioning at the time of soldering of electrodes becomes easy. In addition, since one end of the terminal connection part is an open end, it is easy to carry out the process of making the center electrodes or the outer electrodes conductive, the process of ensuring insulation between the center electrode and the outer electrode, etc., and easy to mechanize It is possible and the work can be streamlined more than the conventional configuration.

  1st invention is a terminal connection part of the pressure sensor which connects a cable-shaped pressure sensor with a coaxial cable, Comprising: The extension direction of the central axis in the terminal part of both the said pressure sensor and the said coaxial cable is substantially the same Since the terminal portions are adjacent to each other in the direction, for example, positioning at the time of soldering the center electrodes becomes easy. In addition, since one end of the terminal connection part is an open end, it is easy to carry out the process of making the center electrodes or the outer electrodes conductive, the process of ensuring insulation between the center electrode and the outer electrode, etc., and easy to mechanize It is possible and the work can be streamlined more than the conventional configuration.

  According to a second aspect of the present invention, in the first aspect of the invention, an insulating portion that insulates a center electrode connecting portion connecting the center electrodes of both the pressure sensor and the coaxial cable from the outer electrodes of both the pressure sensor and the coaxial cable. The insulating portion is formed by thermal processing by inserting a heat-shrinkable tube from the open end side of the terminal connecting portion into a portion where the center electrodes are connected to each other.

  And since the heat-shrinkable tube can be inserted from the open end side of the terminal connection portion into the portion where the center electrodes are connected, there is no need to wrap the insulating tape as in the conventional case, and the work can be rationalized. Thus, there is no concern that the insulating tape is displaced and the insulating property is impaired as in the conventional case, and the reliability is improved.

  In the third invention, in particular, the outer electrode and the insulating portion of both the pressure sensor of the second invention and the coaxial cable are molded with a conductive resin, and the outer electrodes are electrically connected to each other through the conductive resin. The terminal connection part can be sealed.

  In the fourth invention, in particular, in the third invention, the pressure-sensitive sensor and the coaxial cable are molded so as to branch in a predetermined direction, and the layout of the pressure-sensitive sensor and the freedom of signal derivation by the coaxial cable are improved. To do.

  A fifth invention is a pressure sensor terminal connecting method for connecting a cable-shaped pressure sensor to a coaxial cable, and is a pressure sensor terminal connecting method for connecting a cable-shaped pressure sensor to a coaxial cable. A step of adjoining the end portions so that the extension directions of the central axes of the end portions of both the pressure sensor and the coaxial cable are substantially the same direction, and the center electrode of the pressure sensor and the coaxial cable at the adjacent locations. A step of connecting each other by caulking, soldering or the like, a step of inserting a heat-shrinkable tube in the vicinity of the portion where the center electrodes are connected to each other, heat-processing, and covering the vicinity of the heat-shrinkable tube and the pressure-sensitive sensor And a step of performing molding with a conductive resin so that the outer electrodes of the coaxial cable are electrically connected to each other.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 shows a structural diagram of a terminal connection portion of a pressure-sensitive sensor according to a first embodiment of the present invention in the order of processing steps.

  First, in the process 1 of FIG. 1, the terminal part is such that the extending direction of the central axis (directions of arrows A and B in the figure) of the terminal parts 6 and 16 of both the pressure sensor 1 and the coaxial cable 11 is substantially the same direction. Adjacent each other. Next, in step 2, the pressure sensitive sensor 1 and the center electrodes 2 and 12 of the coaxial cable 11 are connected to each other by the center electrode connecting portion 31 made of a caulking jig in the place where the end portions are adjacent to each other in the above step. In step 3, a heat-shrinkable tube is inserted from the direction C in the drawing in the vicinity of the portion where the center electrodes 2 and 12 are connected by the center electrode connecting portion 31, and the insulating portion 32 is formed by thermal processing.

  Further, in step 4, molding is performed with a conductive resin so as to cover the vicinity of the insulating portion 32 and to electrically connect the pressure sensitive sensor 1 and the outer electrodes 4 and 14 of the coaxial cable 11, thereby forming the mold portion 33. . At this time, the pressure sensor 1 and the coaxial cable 11 are branched and molded in the D direction and the E direction, respectively. Note that the direction of each branch can be arbitrarily designed. Further, although there is a gap 34 between the pressure sensor 1 and the coaxial cable 11, the gap 34 is also completely sealed by the fluidity of the conductive resin at the time of molding.

The terminal connection part 35 is completed by the above process.

As the pressure sensor, a cable-shaped piezoelectric sensor, a capacitance sensor, a triboelectric sensor, or the like is used.

  The center electrode connecting portion 31 may be formed by soldering, or may be formed of a metal tape with a conductive adhesive.

  With the above configuration, the terminal portions are adjacent to each other so that the extending directions of the central axes of the terminal portions 6 and 16 of both the pressure sensor 1 and the coaxial cable 11 (arrow directions A and B in the figure) are substantially the same direction. Therefore, the positioning at the time of soldering the center electrodes 2 and 12 becomes easy.

  Moreover, since one end of the terminal connection part 35 is an open end, the process which makes the center electrodes 2 and 12 and outer electrodes 4 and 14 conduct | electrically connect, and insulation between the center electrodes 2 and 12 and the outer electrodes 4 and 14 are carried out. It is easy to perform processing and the like, and can be easily mechanized, so that the work can be more rational than the conventional configuration.

  In addition, since the insulating portion 32 can be formed by inserting a heat-shrinkable tube from the open end side of the terminal connecting portion 35 into the portion where the center electrodes 2 and 12 are connected to each other and performing heat processing, the insulating portion 32 is insulated as in the past. There is no need to wind the tape, the work can be rationalized, and there is no concern that the insulating tape is displaced and the insulation is impaired as in the conventional case, and the reliability is improved.

  The outer electrodes 4 and 14 of both the pressure sensor 1 and the coaxial cable 11 and the insulating portion 32 are molded with a conductive resin, and the outer electrodes 4 and 14 are electrically connected to each other through the conductive resin. The connection part 35 can be sealed.

  Further, the molding process can be mechanized, and the heat-shrinkable tube must be inserted into the pressure-sensitive sensor 1 or the coaxial cable 11 in advance for sealing the connecting portion as in the conventional configuration. There is no troublesome manual work.

Moreover, since the pressure-sensitive sensor 1 and the coaxial cable 11 are molded so as to branch in a predetermined direction, the layout of the pressure-sensitive sensor and the degree of freedom of signal derivation by the coaxial cable are improved.

  In addition, although the insulating part 32 of the said 1st Embodiment was formed with the heat-shrinkable tube, you may form by the mold process by a nonelectroconductive resin, and since a mold process can be mechanized, an operation | work is rationalized more. .

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG.

  The cable-shaped pressure-sensitive sensor in which the coaxial cable is connected by the terminal connection unit described in the first embodiment is used for detecting foreign matter contact in an automatic opening / closing door such as an electric sliding door of an automobile, for example. I can do it. This embodiment will be described with reference to FIG.

  FIG. 2A is a configuration diagram in which the pressure-sensitive sensor 1 according to the first embodiment is used for detecting foreign object contact of the electric slide door 41 of the automobile. In FIG. 2A, the pressure-sensitive sensor 1 is composed of, for example, a cable-shaped piezoelectric sensor, and is connected to the coaxial cable 11 via the terminal connection portion 35. The pressure sensitive sensor 1 is disposed in a protector 36 made of synthetic rubber, thermoplastic elastomer or the like. The pressure-sensitive sensor 1 may be inserted into the protector 36 while injecting compressed air. Alternatively, the pressure sensor 1 may be simultaneously extruded and molded when the protector 36 is extruded. Both ends of the protector 36 are sealed to prevent moisture from entering.

  A shield-type relay connector 37 is attached to the end of the coaxial cable 11. The protector 36 is attached to the end 42 of the electric slide door 41. At this time, the coaxial cable 11 is inserted into the panel of the electric slide door 41 through a through hole 43 provided in the vicinity of the lower end of the end portion 42, and the relay connector 37 is connected to the shield type relay connector 44 of the other party. The relay connector 44 is attached to one end of the coaxial cable 45, and a shield-type connector 46 is attached to the other end of the coaxial cable 45. The connector 46 is connected to a controller 47 that controls driving of the electric slide door 41.

  With these configurations, the output signal of the pressure-sensitive sensor 1 is propagated to the controller 47 via the coaxial cables 11 and 45, subjected to predetermined filter processing and amplification processing, and compared with a threshold value. That is, when the pressure sensor 1 is deformed when a foreign object contacts the protector 36 during the electric sliding door closing operation, an output signal corresponding to the deformation is output from the pressure sensor 1. When the output signal of the pressure-sensitive sensor 1 is subjected to the above processing and becomes equal to or greater than the threshold value, it is determined that there is a foreign object contact, the electric sliding door closing operation is stopped, and the opening operation is reversed. Then, contact with unnecessary foreign matter and pinching with the body are avoided.

  Even if the pressure sensitive sensor 1 is a high impedance sensor such as a piezoelectric sensor, the electrical noise is generated by using the coaxial cables 11 and 45 and the shield type connectors 37, 44 and 46 in the signal propagation path to the controller 47. Since the intrusion of components is shielded, it is not affected by strong electric field noise. In this case, it is further preferable to incorporate the controller 47 in an electrically shielded case.

  In addition, since the coaxial cables 11 and 45 are used in the signal propagation path other than the area where the contact of the foreign object is detected, even if the vibration of the vehicle body is applied to the coaxial cables 11 and 45 inside the door panel, Since the generation of charges from the coaxial cables 11 and 45 is extremely small or not at all, it is hardly affected by vibration noise.

Even when the pressure sensor 1 is a high impedance sensor such as a piezoelectric sensor, a signal input to the controller 47 via the coaxial cables 11 and 45 may be processed by a normal voltage amplification type amplifier. When the electrostatic capacitance C2 of the coaxial cables 11 and 45 is so large that it cannot be ignored with respect to the electrostatic capacitance C1 of the pressure sensor 1, if the charge generated by the pressure sensor 1 is Q, the generated voltage V is V = Q / Due to the relationship of (C1 + C2), it is smaller than the net generated voltage (= Q / C1) in the pressure sensitive sensor 1. In such a case, it is preferable to process a signal input to the controller 47 by a charge amplifier. When the charge amplifier is used, the output voltage is determined by the ratio of the charge generated by the pressure sensor 1 and the feedback capacitor of the charge amplifier regardless of the capacitance of the coaxial cables 11 and 45. Such a loss can be suppressed.

  Further, as a general usage of the pressure sensor 1, a detection circuit including the above-described filter processing circuit, amplification processing circuit, threshold value comparison circuit, and the like is provided at the end of the pressure sensor 1 (corresponding to the terminal connection unit 35). Although there is a configuration in which the detection signal is transmitted from the detection circuit to the controller 47 through a normal lead wire, according to the second embodiment, the detection circuit can be integrated into the controller 47. There is an advantage that the entire system can be rationalized rather than the configuration in which the detection circuit is connected to the end of the pressure-sensitive sensor 1.

  When a cable-shaped piezoelectric sensor is used for the pressure-sensitive sensor 1, it is desirable that the protector 36 be made of a material or a cross-sectional shape that makes the piezoelectric sensor as easy to deform as possible when a foreign object comes into contact. This is because the piezoelectric sensor generates an output voltage proportional to the deformation acceleration. For example, FIG. 2B shows a cross-sectional view of the protector 36 at the FF position in FIG. As shown in FIG. 2B, the protector 36 has a hollow portion 38 inside, and the pressure-sensitive sensor 1 is easily deformed in the direction of the hollow portion 38 when a foreign object comes into contact with the protector 36. . Providing such a hollow portion 38 improves the sensitivity of the pressure-sensitive sensor 1 and also has a buffering action when foreign matter comes into contact with the protector 36, thereby reducing the load on the touched foreign matter.

  Moreover, although the above showed the application example to the electric slide door of a motor vehicle, you may apply to opening-and-closing parts, such as a hatchback door of a motor vehicle, and a sunroof power window. Moreover, you may apply to automatic doors, such as a building and a train.

As described above, the terminal connection portion of the pressure-sensitive sensor according to the present invention can provide a terminal connection portion that does not require time and labor for connecting the cable-shaped pressure-sensitive sensor to the coaxial cable.
Therefore, it is suitable when it is not desired to be influenced by unnecessary vibration in the path for deriving a signal from the pressure sensor. For example, it can be applied as a sensor for a security system for security that is installed on a fence for a house fence or facility boundary to detect an intruder, and is affected by unnecessary vibrations other than the fence or fence. Therefore, a practical crime prevention system that can detect only the vibrations of fences and fences by intruders becomes possible.

Processing steps and configuration diagram of terminal connection portion of pressure-sensitive sensor according to Embodiment 1 of the present invention (A) The block diagram which used the pressure-sensitive sensor 1 in Embodiment 2 of this invention for the foreign material contact detection of the electric slide door 41 of a motor vehicle (b) Sectional drawing of the protector 36 in the FF position of Fig.2 (a) Process and structure diagram of connecting part processing by conventional technology

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure sensor 2 Center electrode 3 Pressure sensitive layer 4 Outer electrode 5 Covering layer 6 Terminal part 11 Coaxial cable 12 Center electrode 13 Insulating layer 14 Outer electrode 15 Outer layer 16 Terminal part 31 Center electrode connection part 32 Insulating part 33 Mold part 35 Terminal connection

Claims (5)

A terminal connecting portion of a pressure sensitive sensor for connecting a cable-shaped pressure sensitive sensor to a coaxial cable, the terminal portion so that the extension direction of the central axis in both terminal portions of the pressure sensitive sensor and the coaxial cable is substantially the same direction. The terminal connection part of the pressure sensor characterized by connecting the center electrodes and the outer electrodes of both the pressure sensor and the coaxial cable so that they are adjacent to each other, and one end of the terminal connection part is an open end. . A center electrode connecting portion that connects the center electrodes of both the pressure sensor and the coaxial cable is provided with an insulating portion that insulates from the outer electrodes of both the pressure sensor and the coaxial cable, and the insulating portion connects the center electrodes to each other. The terminal connection part of the pressure-sensitive sensor according to claim 1, wherein a heat-shrinkable tube is inserted into the part from the open end side of the terminal connection part and is molded by thermal processing. The terminal connection part of the pressure-sensitive sensor according to claim 2, wherein the outer electrode and the insulating part of both the pressure-sensitive sensor and the coaxial cable are molded with a conductive resin. The terminal connection part of the pressure sensor of Claim 3 molded so that a pressure sensor and a coaxial cable may branch in a predetermined direction. A terminal connection method for pressure-sensitive sensors, in which a cable-shaped pressure-sensitive sensor is connected to a coaxial cable, wherein the extension portions of the central axes of both ends of the pressure-sensitive sensor and the coaxial cable are substantially in the same direction. A step of adjoining each other, a step of connecting the center electrode of the pressure sensor and the coaxial cable by caulking or soldering at an adjacent location, and inserting a heat-shrinkable tube in the vicinity of the site where the center electrodes are connected And at least a step of performing heat processing, and a step of performing molding with a conductive resin so as to cover the vicinity of the heat-shrinkable tube and to connect the outer electrodes of the pressure-sensitive sensor and the coaxial cable to each other. To connect the terminal of the pressure sensor.

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