Pressure sensor equipped cable

Abstract

To provide a pressure sensor equipped cable capable of suppressing the effect of electrostatic discharge on the pressure sensor.SOLUTION: A pressure sensor equipped cable includes a pressure sensor and a cable connected to the pressure sensor. The pressure sensor includes a pad to which a conductor included in the cable is connected, and a diaphragm. The pressure sensor equipped cable includes a first adhesive for fixing the conductor to the pad, a conductive second adhesive for covering the pressure sensor and the first adhesive, and a third adhesive for providing insulation between the diaphragm and the second adhesive.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a cable with a pressure sensor. [Background technology]

[0002] Small pressure sensors of 1 mm or less are used for medical purposes. Pressure sensors measure the pressure of gas or liquid through a diaphragm using a pressure-sensitive element, convert it into an electrical signal, and output it. Some pressure sensors use a resistive circuit. A pressure sensor is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-173214 A Summary of the Invention [Problem to be solved by the invention]

[0004] Electrostatic discharge can destroy the pressure-sensitive element of a pressure sensor. Also, if the pressure sensor uses a resistive circuit, electrostatic discharge can change the resistance of the pressure-sensitive element, causing the output value to fluctuate.

[0005] As countermeasures against electrostatic discharge, measures such as providing an anti-static element in the resistive circuit and protecting the pressure sensor with a metal sleeve or the like can be considered. However, the former measure is difficult to implement because it increases the size of the pressure sensor, affects the resistance value of the resistive circuit, etc. Also, the latter measure is difficult to implement because it increases the size of the pressure sensor.

[0006] In one aspect of the present disclosure, it is preferable to provide a cable with a pressure sensor that can suppress the effects of electrostatic discharge on the pressure sensor. [Means for solving the problem]

[0007] One aspect of the present disclosure is a cable with a pressure sensor including a pressure sensor and a cable connected to the pressure sensor. The pressure sensor includes a pad to which a conductor included in the cable is connected, and a diaphragm. The cable with pressure sensor includes a first adhesive that fixes the conductor to the pad, a conductive second adhesive that covers the pressure sensor and the first adhesive, and a third adhesive that provides insulation between the diaphragm and the second adhesive.

[0008] When the pressure sensor cable according to one aspect of the present disclosure is subjected to electrostatic discharge, electricity passes preferentially through the conductive second adhesive. Furthermore, the third adhesive insulates between the diaphragm and the second adhesive. Therefore, electricity is less likely to flow from the second adhesive to the diaphragm. As a result, even when electrostatic discharge is received, it is possible to prevent the pressure-sensitive element of the pressure sensor from being destroyed or the output value from fluctuating.

[0009] Another aspect of the present disclosure is a cable with a pressure sensor, comprising a pressure sensor and a cable connected to the pressure sensor. The pressure sensor comprises a pad to which a conductor of the cable is connected, and a diaphragm. The cable with pressure sensor comprises a first adhesive that fixes the conductor to the pad, and a conductive second adhesive that covers the pressure sensor and the first adhesive. The first adhesive provides insulation between the diaphragm and the second adhesive.

[0010] When the cable with pressure sensor according to another aspect of the present disclosure is subjected to electrostatic discharge, electricity passes preferentially through the conductive second adhesive. Furthermore, the first adhesive insulates between the diaphragm and the second adhesive. Therefore, electricity is less likely to flow from the second adhesive to the diaphragm. As a result, even when electrostatic discharge is received, it is possible to prevent the pressure-sensitive element of the pressure sensor from being destroyed or the output value from fluctuating. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view illustrating a configuration of a cable with a pressure sensor according to the first embodiment. [Diagram 2] FIG. 2 is a side view illustrating a configuration of the cable with pressure sensor according to the first embodiment. [Diagram 3] FIG. 11 is a side view illustrating a configuration of a cable with a pressure sensor according to a second embodiment. [Figure 4] FIG. 11 is a side view illustrating a configuration of a cable with a pressure sensor according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. First Embodiment 1. Configuration of cable with pressure sensor 1 The configuration of the cable with pressure sensor 1 will be described with reference to Figs. 1 and 2. The cable with pressure sensor 1 includes a pressure sensor 3 and a cable 5. The cable 5 is connected to the pressure sensor 3. The pressure sensor 3 can detect the pressure of a gas or liquid. The cable with pressure sensor 1 is for medical use, for example. The cable with pressure sensor 1 can be used in endoscopes, catheters, probes, etc. The vertical size, horizontal size, and thickness of the pressure sensor 3 are, for example, 1 mm or less.

[0013] The pressure sensor 3 has a plate-like shape that is rectangular in plan view. The direction parallel to the long side of the rectangle, which is from right to left in Figures 1 and 2, is defined as the X1 direction. The opposite direction to the X1 direction is defined as the X2 direction. One of the main surfaces of the pressure sensor 3 is defined as the first surface 4. The first surface 4 is parallel to the X1 direction and the X2 direction.

[0014] The pressure sensor 3 includes a diaphragm 7, an electrical inspection pad 9, and a conductor connection pad 11. The diaphragm 7, the electrical inspection pad 9, and the conductor connection pad 11 are each formed on the first surface 4. The diaphragm 7 is on the X1 direction side of the first surface 4. The conductor connection pad 11 is on the X2 direction side of the first surface 4. The electrical inspection pad 9 is between the diaphragm 7 and the conductor connection pad 11 in the X1 and X2 directions.

[0015] There are provided a plurality of conductor connection pads 11. The plurality of conductor connection pads 11 are arranged at intervals along a direction perpendicular to the X1 direction and the X2 direction. Each of the conductor connection pads 11 extends parallel to the X1 direction and the X2 direction.

[0016] A resistance bridge (not shown) is attached to the back side of the diaphragm 7. The diaphragm 7 is distorted according to the pressure at the location where the pressure sensor 3 is installed. The resistance of the resistance bridge changes according to the amount of distortion of the diaphragm 7. The pressure sensor 3 outputs an electrical signal that reflects the resistance of the resistance bridge. The output electrical signal represents the pressure at the location where the pressure sensor 3 is installed.

[0017] The cable 5 includes a plurality of electric wires 13, a shield 15, and a sheath 17. The shield 15 is provided on the outer periphery of the plurality of electric wires 13. The sheath 17 is provided on the further outer periphery of the shield 15. Each electric wire 13 includes a conductor 19 and an insulator 21. The insulator 21 covers the conductor 19.

[0018] The longitudinal direction of the cable 5 is parallel to the X1 and X2 directions. In the portion of the cable 5 on the X1 direction side, the shield 15 and the sheath 17 are removed to expose the multiple electric wires 13. The portion of the electric wires 13 that is not covered by the shield 15 and the sheath 17 and where the insulator 21 is exposed is referred to as an exposed electric wire portion 13B.

[0019] End 15A of shield 15 on the X1 direction side is further toward the X1 direction than end 17A of sheath 17 on the X1 direction side. Therefore, a portion of shield 15 that is further in the X1 direction than end 17A (hereinafter referred to as exposed shield portion 15B) is exposed and not covered by sheath 17. The end of shield 15 on the X2 direction side is electrically connected to, for example, ground.

[0020] Of the conductor 19, the insulator 21 is removed from a conductor end 19A on the X1 direction side, exposing the conductor 19. The end 21A on the X1 direction side of the insulator 21 is located further in the X1 direction than the end 15A. Each of the multiple conductor end portions 19A is electrically connected to one conductor connection pad 11 via solder or the like.

[0021] The cable 1 with pressure sensor includes a first adhesive 31. The first adhesive 31 fixes the conductor end 19A to the conductor connection pad 11. As shown in FIG. 1, when viewed from a direction perpendicular to the first surface 4, the first adhesive 31 covers the entire conductor connection pad 11 and the entire conductor end 19A. The first adhesive 31 further covers a portion of the electric wire exposed portion 13B on the X1 direction side. The first adhesive 31 does not cover the diaphragm 7, the electrical inspection pad 9, and the shield exposed portion 15B. Even if an external force acts on the cable 5, the first adhesive 31 can prevent the conductor end 19A from coming off the conductor connection pad 11.

[0022] 2, when viewed from a direction parallel to the first surface 4 and perpendicular to the X1 and X2 directions, the first adhesive 31 covers part of the first surface 4 and part of the side surface 33 of the surface of the pressure sensor 3. The side surface 33 is a side surface located in the X2 direction. The first adhesive 31 does not cover other parts of the surface of the pressure sensor 3.

[0023] The first adhesive 31 covers the entire periphery of the conductor end 19A and the exposed wire portion 13B in the portion located on the X2 direction side of the pressure sensor 3. The first adhesive 31 is made of an insulating material. The first adhesive 31 is, for example, an epoxy adhesive, a cyanoacrylate adhesive, or the like.

[0024] The cable with pressure sensor 1 includes a third adhesive 35. As shown in Figs. 1 and 2, the third adhesive 35 covers the entire pressure sensor 3 and the entire first adhesive 31. The third adhesive 35 also covers the diaphragm 7 and the electrical inspection pad 9. The third adhesive 35 does not cover the shield exposed portion 15B. The third adhesive 35 extends further in the X2 direction than the first adhesive 31. The third adhesive 35 covers a portion of the electric wire exposed portion 13B that is on the X1 direction side.

[0025] The third adhesive 35 is made of an insulating material. The third adhesive 35 is, for example, a silicone-based adhesive. For example, an adhesive having a Shore A hardness of 20 to 65 can be used as the third adhesive 35. The third adhesive 35 is preferably softer than the first adhesive 31 and has a softness that does not affect pressure sensing (i.e., the distortion of the diaphragm 7). The thickness of the portion of the third adhesive 35 that covers the diaphragm 7 is preferably such that it does not hinder the distortion of the diaphragm 7.

[0026] The cable 1 with pressure sensor includes a second adhesive 37. As shown in Figs. 1 and 2, the second adhesive 37 covers the entire third adhesive 35. As described above, the third adhesive 35 covers the entire pressure sensor 3 and the entire first adhesive 31, and therefore the second adhesive 37 covers the entire pressure sensor 3 and the entire first adhesive 31. It is preferable that the thickness of the portion of the second adhesive 37 that covers the diaphragm 7 is such that it is difficult to prevent the distortion and deformation of the diaphragm 7.

[0027] In this specification, when object A "covers" object B, it means that object A is present on the outer periphery of object B. Object A may be in direct contact with object B, or another object may be present between object A and object B.

[0028] The second adhesive 37 covers the shield exposed portion 15B and is in direct contact with the shield exposed portion 15B. The second adhesive 37 is made of a conductive material. The conductivity of the second adhesive 37 is, for example, 1×10 -1 Ω cm or more 4×10 -5 It is preferable that the resistivity is Ω·cm or less.

[0029] The second adhesive 37 includes, for example, a resin and conductive fine particles. The conductive fine particles are dispersed in the resin. Examples of the resin include silicone resin. Examples of the conductive fine particles include carbon fine particles and silver fine particles. The second adhesive 37 is preferably softer than the first adhesive 31.

[0030] 2, the third adhesive 35 is present between the diaphragm 7 and the electrical testing pad 9 and the second adhesive 37. The third adhesive 35 provides insulation between the diaphragm 7 and the electrical testing pad 9 and the second adhesive 37.

[0031] The cable with pressure sensor 1 can be manufactured, for example, by the following method. With the conductor end 19A electrically connected to the conductor connection pad 11, a first adhesive 31 is applied using a syringe needle or the like and cured to fix the conductor end 19A to the conductor connection pad 11. Next, a third adhesive 35 is applied by dipping or the like and cured. Next, a second adhesive 37 is applied by dipping or the like and cured. By applying the second adhesive 37 and the third adhesive 35 by dipping, it is possible to prevent the occurrence of areas where no adhesive is applied.

[0032] 2. Benefits of the Pressure Sensor Cable 1 (1A) When the cable with pressure sensor 1 is subjected to electrostatic discharge, electricity flows preferentially through the conductive second adhesive 37 and to the ground via the shield 15. Electricity is less likely to flow to the pressure sensor 3. Therefore, even when electrostatic discharge is received, it is possible to prevent the pressure-sensitive element of the pressure sensor 3 from being destroyed and the output value from fluctuating.

[0033] (1B) The third adhesive 35 insulates the diaphragm 7 and the electrical inspection pad 9 from the second adhesive 37. Therefore, electricity generated by electrostatic discharge is unlikely to flow to the diaphragm 7 and the electrical inspection pad 9.

[0034] (1C) For example, the second adhesive 37 and the third adhesive 35 are softer than the first adhesive 31. In this case, the second adhesive 37 and the third adhesive 35 are less likely to prevent the distortion and deformation of the diaphragm 7 caused by pressure changes. As a result, the second adhesive 37 and the third adhesive 35 are less likely to affect the pressure detection by the pressure sensor 3. In addition, the first adhesive 31 is harder than the second adhesive 37 and the third adhesive 35, so the conductor end 19A can be fixed to the conductor connection pad 11 more firmly.

[0035] (1D) The cable 1 with pressure sensor includes a shield 15. The second adhesive 37 electrically connects to the shield 15. Therefore, when the cable 1 with pressure sensor is subjected to electrostatic discharge, electricity can flow to the shield 15. As a result, it is possible to further prevent the pressure-sensitive element of the pressure sensor 3 from being destroyed and the output value from fluctuating.

[0036] (1E) The cable with pressure sensor 1 can suppress the size of the pressure sensor 3 from increasing and the resistance value of the resistive circuit from being affected, compared to the case where conventional electrostatic discharge countermeasures are implemented. <Second embodiment> 1. Differences from the first embodiment The second embodiment has a basic configuration similar to that of the first embodiment, and therefore differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

[0037] In the first embodiment described above, the third adhesive 35 covers the entire pressure sensor 3 and the entire first adhesive 31. In contrast, the second embodiment differs from the first embodiment in that the third adhesive 35 is provided only on the first surface 4, as shown in FIG.

[0038] The third adhesive 35 covers the first surface 4 of the pressure sensor 3, but does not cover the other surfaces. The third adhesive 35 does not cover the conductor end 19A and the portion of the first adhesive 31 that is located on the X2 direction side of the pressure sensor 3. In addition, the third adhesive 35 does not cover the electric wire exposed portion 13B.

[0039] 2. Benefits of the Pressure Sensor Cable 1 According to the second embodiment described above in detail, the effects of the first embodiment described above are achieved. <Third embodiment> 1. Differences from the first embodiment The third embodiment has a basic configuration similar to that of the first embodiment, and therefore differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configurations, and the preceding description will be referred to.

[0040] In the above-described first embodiment, the first adhesive 31 and the third adhesive 35 are provided. In contrast, in the third embodiment, as shown in Fig. 4, the first adhesive 31 covers the same area as the first adhesive 31 and the third adhesive 35 in the first embodiment.

[0041] The first adhesive 31 is present between the diaphragm 7 and the electrical testing pad 9 and the second adhesive 37. The first adhesive 31 insulates the diaphragm 7 and the electrical testing pad 9 from the second adhesive 37. The first adhesive 31 is made of an insulating material. Similarly to the third adhesive 35, the first adhesive 31 is preferably made of a soft material.

[0042] 2. Benefits of the Pressure Sensor Cable 1 According to the third embodiment described above in detail, in addition to the effects (1A), (1D) to (1E) of the first embodiment described above, the following effect is also obtained.

[0043] (3A) The first adhesive 31 insulates the diaphragm 7 and the electrical inspection pad 9 from the second adhesive 37. Therefore, electricity generated by electrostatic discharge is unlikely to flow to the diaphragm 7 and the electrical inspection pad 9. <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0044] (1) In each of the above embodiments, the cable 5 may include a ground wire instead of the shield 15 or in addition to the shield 15. The ground wire is connected to the ground at the end on the X2 direction side, for example. The second adhesive 37 may be electrically connected to the ground wire. In this case, too, the same effect as when the second adhesive 37 is connected to the shield 15 can be achieved.

[0045] (2) The function of one component in each of the above embodiments may be shared by multiple components, or the functions of multiple components may be performed by one component. Also, part of the configuration of each of the above embodiments may be omitted. Also, at least part of the configuration of each of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0046] (3) In addition to the above-described cable with pressure sensor 1, the present disclosure can be realized in various forms, such as a system including the cable with pressure sensor 1 as a component, a method for manufacturing the cable with pressure sensor 1, etc. [Explanation of symbols]

[0047] 1...cable with pressure sensor, 3...pressure sensor, 4...first surface, 5...cable, 7...diaphragm, 9...electrical inspection pad, 11...conductor connection pad, 13...electric wire, 13B...exposed wire portion, 15...shield, 15A...end, 15B...exposed shield portion, 17...sheath, 17A...end, 19...conductor, 19A...conductor end, 21...insulator, 21A...end, 31...first adhesive, 33...side, 35...third adhesive, 37...second adhesive

Claims

1. A cable with a pressure sensor comprising a pressure sensor and a cable connected to the pressure sensor, The pressure sensor includes a pad to which a conductor of the cable is connected, and a diaphragm. a first adhesive for securing the conductor to the pad; a conductive second adhesive covering the pressure sensor and the first adhesive; a third adhesive for insulating the diaphragm from the second adhesive; Equipped with Cable with pressure sensor.

2. 2. The cable with pressure sensor according to claim 1, the second adhesive and the third adhesive are softer than the first adhesive; Cable with pressure sensor.

3. A cable with a pressure sensor comprising a pressure sensor and a cable connected to the pressure sensor, The pressure sensor includes a pad to which a conductor of the cable is connected, and a diaphragm. a first adhesive for securing the conductor to the pad; a conductive second adhesive covering the pressure sensor and the first adhesive; Equipped with The first adhesive provides insulation between the diaphragm and the second adhesive. Cable with pressure sensor.

4. The cable with pressure sensor according to any one of claims 1 to 3, The cable includes a shield or a ground wire, The second adhesive is electrically connected to the shield or the ground wire. Cable with pressure sensor.

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