JP2009080091A - Capacitive moisture sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that a membrane type sensor has required a uniform contact with a soft section such as the inside of an oral cavity as a section to be measured to acquire highly reproducible measurement results since a section having the highest density of electric lines of force is covered with a protective film to have only low sensitivity, that an increase in a force of pressing the sensor to the section to be measured has required a structure which resists the force, and that a structure on the sensor side of a measuring device has been complicated and increased in size in the case where an angle adjusting mechanism is provided. <P>SOLUTION: In a capacitive moisture sensor, two-system sensing enameled wires 3 and 4 connected to a capacitance detection circuit 2 are held in a state of approximate arrangement via a space 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a capacitance type moisture sensor used for measuring moisture in a portion such as a tongue in an oral cavity, for example.

  As one of intraoral moisture sensors for measuring the amount of moisture in the mouth, that is, saliva, a capacitive moisture sensor is used.

  Capacitance-type moisture sensors measure the amount of moisture by capacitance using the fact that the dielectric constant of moisture is higher than that of other parts of the human body. Since it is easy to increase the thickness, a thin film type sensor has attracted attention.

  23 and 24 are explanatory views conceptually showing an example of a thin film type capacitive moisture sensor, FIG. 23 is a system diagram including a plan view, and FIG. 24 is a cross-sectional view taken along the line GG of FIG. is there. Reference numeral a is an insulating substrate. On this substrate a, two systems of conductors b and c as a pair of sensing electrodes are formed in opposing comb shapes, and then these conductors b and c are formed. In order to protect the film, a protective film d is formed by coating or pasting. These two systems of conductors b and c are connected to the capacitance detection circuit g by lead wires e and f.

  The solid line h in FIG. 24 indicates the electric lines of force generated in such a sensor. Originally, if the moisture to be measured is located at a location where the electric line of force density is high, the efficiency is high and the sensitivity is high. However, since the portion with the highest electric field line density is covered with the protective film d, the moisture to be measured cannot reach that portion, and the efficiency is not so good.

On the other hand, in a conventional contact-type measuring instrument in which a rigid sensor is fixed to a gripping member and a measurer holds the gripping member and presses the sensor against the measurement site and makes contact, the sensor is pressed against the measurement site. If the contact condition changes depending on the direction of the force to be contacted and the degree of the force, the measurement value will vary. As a means for preventing this, for example, in the invention described in Patent Document 1, the sensor is a target. An angle adjustment mechanism that allows the sensor to tilt with respect to the gripping member so that the direction of the pressing force against the part is always perpendicular to the contact surface between the sensor and the measurement part, and a pressure sensor that detects the contact pressure is provided. ing.
JP 2005-205041 A

  As described above, the thin film type sensor has a low sensitivity because the part with the highest electric force line density is covered with a protective film, so if the measurement site is a soft part such as in the oral cavity, Therefore, a measurement result with good reproducibility cannot be obtained unless the sensor is uniformly contacted.

  However, since the thin film type sensor has a large area in contact with the measurement site due to the protective film and the surface is not flat, a sensor angle adjustment mechanism as shown in Patent Document 1 is provided, or the sensor is used as the measurement site. Unless the pressing force is increased, it is difficult to uniformly contact the sensor with the measurement site. In particular, when the measurement site is in the oral cavity, the contact state of the sensor with the measurement site cannot be visually observed at the time of measurement, so that accurate measurement is further difficult.

Further, when the force for pressing the sensor against the measurement site is increased, a structure for resisting the force is required. With the angle adjustment mechanism as shown in Patent Document 1, the structure on the sensor side of the measuring instrument becomes complicated and large. This causes the problem that
The present invention aims to solve the above problems.

  In order to achieve the above-described object, the present invention proposes a capacitance moisture sensor in which two sensing enamel wires connected to a capacitance detection circuit are held in close proximity via a space. .

  And in this invention, it can be set as the structure by which the enamel wire for sensing is hold | maintained by the support body which has rigidity in the said structure. In this case, the support can be a thick enamel wire or a frame of the enamel wire.

  Further, according to the present invention, in the above configuration, the sensing enamel wire is held in a close proximity state by a support made of a thin plate-like insulating member that is rigid and elastically deformable in the thickness direction. A capacitive moisture sensor is proposed. In this case, the thin plate-like insulating member can be a flexible printed board.

  The present invention also proposes a capacitive moisture sensor in which the two systems of sensing enamel wires are held in close proximity by their own rigidity, not by the support, in the above configuration.

  Further, the present invention proposes a capacitance type moisture sensor in which the two systems of sensing enamel wires are arranged close to each other in the shape of an opposing comb or a meandering shape parallel to each other.

  Further, the present invention proposes a capacitance moisture sensor in which the two systems of sensing enamel wires are arranged close to each other in a lattice shape in the above configuration. Further, the present invention proposes a capacitive moisture sensor in which two systems of sensing enamel wires arranged close to each other in a lattice shape are knitted in a net shape.

  The present invention also proposes a capacitive moisture sensor having a linear body arranged between two systems of sensing enamel wires arranged close to each other in the above configuration.

  In the capacitance type moisture sensor of the present invention, the two enamel wires for sensing connected to the capacitance detection circuit are held in close proximity through the space, so that in the measurement, such as in the oral cavity It is the portion of the sensing enamel wire that contacts the measurement site, and since the contact area is small, stable contact is possible with a small force.

  Since the enameled wire for sensing can be deformed by its own elasticity, it can be satisfactorily contacted with a measurement site with a small force without using an angle adjusting mechanism, and has excellent durability.

  The support that holds the enameled wire for sensing can be a thick enameled wire or a frame of enameled wire, but it is also a thin plate that is rigid and elastically deformable in the thickness direction. If the insulating member, for example, a support made of a flexible printed circuit board is used to hold the sensor body in a close proximity state, the sensor body can be made thinner and deformable to follow the surface of the measurement site.

  In this case, since the contact area of the sensing enamel wire with the surface of the measurement site can be increased, high sensitivity can be achieved, and errors due to different pressing force and contact angle at the time of contact are reduced. be able to.

  In the capacitive moisture sensor of the present invention, the moisture to be measured can reach the space between the sensing enamel wires with the highest density of electric lines of force, so that efficient and highly sensitive measurement can be performed. .

  In the capacitance type moisture sensor of the present invention, the pair of electrodes of the capacitance type moisture sensor is composed of enameled wires. The sensitivity can be increased by narrowing and increasing the arrangement density of the sensing enamel wires.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
First, FIG. 1 is an explanatory view conceptually showing a first embodiment of a capacitance type moisture sensor according to the present invention, FIG. 1 is a system diagram including a plan view, and FIG. 2 is an AA of FIG. It is line sectional drawing.
Reference numeral 1 denotes a capacitance moisture sensor. This sensor 1 holds two systems of sensing enamel wires 3 and 4 connected to the capacitance detection circuit 2 in close proximity via a space 5. This is the configuration. Reference numerals 6 and 7 are lead wires for connecting the sensing enamel wires 3 and 4 and the capacitance detection circuit 2. In this embodiment, the enamel wires 3 and 4 are arranged close to each other in the shape of an opposing comb, and are held by an appropriate holding mechanism in this state, but the form of the close arrangement and an example of the holding mechanism will be described later. .

  In the present invention, the enamel wires 3 and 4 are resin materials such as enamel, polyester, polyurethane, polyimide, polyvinyl formal, nylon, polyamide imide, polyester imide, epoxy, etc. on a highly conductive wire such as a copper wire or an aluminum wire. Refers to an insulating layer coated. The thinner the insulating coating 9 in the enameled wires 3 and 4, the better in terms of measurement performance, but it can be appropriately set in consideration of damage during use. For example, when using a commercially available enameled wire, the film thickness is about 0.039 to 0.044 mm.

  In the above configuration, in the capacitive moisture sensor of the present invention, the two systems of sensing enamel wires 3 and 4 connected to the capacitance detection circuit are held in close proximity via the space 5. Therefore, as shown in FIG. 2B, only the sensing enamel wires 3 and 4 are in contact with the measurement site 10 such as in the oral cavity in the measurement, and thus a protective film is formed on the surface of the conductor. Since the contact area with the measurement site 10 is small compared to the conventional thin film type sensor, the sensing enamel wires 3 and 4 can be stably brought into contact with the measurement site 10 with a small force. .

  Further, since the sensing enamel wires 3 and 4 can be deformed by their own elasticity, the measurement site 10 can be moved with a small force without using the angle adjusting mechanism described in Patent Document 1 described above. Good contact and excellent durability.

  Further, in this capacitance type moisture sensor 1, electric lines of force 11 are generated as shown in FIG. 2A, but in the measurement state shown in FIG. 2B, the water 12 to be measured has the highest electric force line density. Since it is located in the high space 5 between the enamel wires 3 and 4 for sensing, it is possible to efficiently perform highly sensitive measurement.

Next, FIGS. 3 and 4 show a second embodiment of the capacitive moisture sensor according to the present invention, FIG. 3 is a plan view, and FIG. 4 is a sectional view taken along line BB in FIG. . This embodiment corresponds to a specific example in which the two enamel wires 3 and 4 are arranged and held in close proximity to each other in an opposing comb shape.
In this embodiment, the lead wires 6 and 7 are thick enamel wires, and the tip ends of the lead wires 6 and 7 are attached to the sensing enamel wires 3, 4 as a support.
That is, an exposed portion 15 of the conductor from which the insulator 14 is partially removed is formed on the leading end side of the lead wires 6 and 7, and the sensing enamel wires 3 and 4 are orthogonal to the lead wires 6 and 7. A plurality of them are alternately arranged, and on the corresponding side of the lead wires 6 and 7, the insulating coating 9 at the end is peeled off to expose the conductors 8, and the exposed portions 15 of these conductors 8 and the lead wires 6 and 7 are exposed. The enameled wires 3 and 4 for sensing are electrically connected to the corresponding lead wires 6 and 7, respectively, by bringing them into contact and joining them by welding, brazing, or the like. Reference numeral 16 schematically represents a joint portion. As shown in FIG. 4 (not shown in FIG. 3), an adhesive 17 is applied to these electrical connection portions, and the lead wires 6 and 7 are sensed. Used for fixing to the enameled wires 3 and 4 and for insulating the electrical connection points. In addition, in the enamel wires 3 and 4 for sensing, an adhesive 17 is applied to an end portion on the side that is not electrically connected to the lead wires 6 and 7 to insulate the end portion.

  With the above configuration, the sensing enamel wires 3 and 4 are supported at both ends on the leading ends of the lead wires 6 and 7 having rigidity, so that the shape as a sensor is maintained and the reproducibility of measured values is good. A sensor can be constructed. Since the distal ends of the lead wires 6 and 7 can be elastically deformed to some extent, good contact with the measurement site 10 is possible with the elastic deformation of the sensing enamel wires 3 and 4.

Next, FIG. 5 and FIG. 6 are explanatory views showing a third embodiment of the capacitive moisture sensor according to the present invention, FIG. 5 is a system diagram including a plan view, and FIG. FIG.
In this embodiment, one end of a pair of lead wires 6, 7 made of enameled wire, in this case, the tip of the lead wire 7 is bent at a right angle, and the tip of the lead wires 6, 7 is made of enameled wire. The rectangular frame 18 is fixed. A plurality of sensing enamel wires 3 and 4 are arranged in a grid pattern vertically and horizontally on the rectangular frame 18 and supported by being knitted in a net shape. That is, in this configuration, the rectangular frame 18 corresponds to the support body having the rigidity described above.

  The end portions of the sensing enamel wires 3 and 4 arranged in a grid pattern in the vertical and horizontal directions on the lead wires 6 and 7 side respectively peel off the insulating film 9 to expose the conductor 8, and the corresponding lead wires 6 and 7 An exposed portion 15 of the conductor from which the insulator 14 is partially removed is formed at the tip, and the conductor 8 and the exposed portion 15 are brought into contact with each other and joined by welding, brazing, or the like in the same manner as described above. 3 and 4 are electrically connected to the corresponding lead wires 6 and 7, respectively. On the other hand, the other end portions of the sensing enamel wires 3 and 4 are electrically connected to each other by welding, brazing, or the like, similarly to the one end side. Then, as shown in FIG. 6 (not shown in FIG. 5), an adhesive 17 is applied to these electrical connection portions, and the lead wires 6 and 7, the sensing enamel wires 3 and 4, and the rectangular frame 18 It is used for fixing the electrical connections and for insulating the electrical connection points. Note that, as in the second embodiment, reference numeral 16 schematically indicates a joint.

  Here, the rectangular frame 18 may be formed of a conductor such as metal if the rectangular frame 18 is formed of an insulator and is not in electrical contact with the conductor 8 of the sensing enamel wires 3 and 4. In addition, a method of fixing the rectangular frame 18 to the tips of the lead wires 6 and 7 is also appropriate.

  In the above configuration, the sensing enamel wires 3 and 4 are supported at both ends by the rectangular frame 18 and the lead wires 6 and 7, so that the shape as a sensor is maintained, and a sensor with good reproducibility of measured values is obtained. Can be configured. In this configuration, both end portions of the sensing enamel wires 3 and 4 are maintained so as not to be deformed by the rectangular frame 18, but the intermediate portion can be elastically deformed to some extent, so that the measurement site is good. Contact is possible.

  Further, in this configuration, moisture can be retained by surface tension in the lattice formed by the sensing enamel wires 3 and 4, so that measurement can be stabilized and sensitivity can be increased.

  Next, FIG. 7 and FIG. 8 are plan views showing fourth and fifth embodiments of the capacitive moisture sensor according to the present invention, and these embodiments show two systems of sensing enamel wires 3. 4 corresponds to a specific example in which the four are arranged in close proximity in a lattice shape.

  First, in FIG. 7, the enamel wires for sensing 3 and 4 are meandered in directions orthogonal to each other, and are knitted in a net shape every two adjacent wires, one end side is opened and the other end side is lead wires 6 and 7. The connection parts 19 and 20 are provided. In this configuration, the sensing enameled wires 3 and 4 knitted in a net shape can be held by their own rigidity, or by being fixed with an adhesive at their intersections.

  Next, in FIG. 8, the enamel wires 3 and 4 for sensing are meandered in directions orthogonal to each other and knitted in a net-like manner for each adjacent one, with one end open and the other end lead 6 7 is provided with connection portions 19 and 20. Also in this configuration, the sensing enameled wires 3 and 4 knitted in a mesh shape can be held by their own rigidity, or can be held by fixing them with an adhesive at their intersections.

  In the fourth and fifth embodiments described above, in order to hold the sensing enamel wires 3 and 4 in a state of being close to each other, the rectangular frame 18 in the second embodiment or the third embodiment. Since a support body such as the lead wires 6 and 7 is not required, the configuration can be greatly simplified.

Next, FIGS. 9, 10, and 11 are plan views showing sixth, seventh, and eighth embodiments of the capacitive moisture sensor according to the present invention, respectively. In these embodiments, unlike the fourth and fifth embodiments, the sensing enamel wires 3 and 4 meander in the same direction.
In the sixth embodiment of FIG. 9, the sensing enamel wires 3 and 4 are arranged in parallel so that the meandering portions do not overlap, and in the seventh embodiment of FIG. 10, the sensing enamel wires are arranged. 3, the meandering portions of the sensing enamel wires 3 and 4 are superposed so as to intersect with each other in the eighth embodiment of FIG.

  In the configurations of the sixth to eighth embodiments described above, the sensing enamel wires 3 and 4 are held by their own rigidity, and are also held by fixing them with an adhesive at their overlapping or intersecting points. In order to hold the sensing enamel wires 3 and 4 in close proximity, the rectangular frame 18 in the second embodiment and the lead wires 6 and 7 in the third embodiment themselves Since no support is required, the configuration can be greatly simplified.

  Next, FIG. 12 is a perspective view showing a ninth embodiment of the capacitive moisture sensor according to the present invention. In this embodiment, at least a part of the enamel wires for sensing 3 and 4 constituting the sensor is shown. Can be configured as a stranded wire.

  In this configuration, it is possible to detect a change in capacitance due to moisture entering between the sensing enamel wires 3 and 4 constituting the stranded wire with high sensitivity.

  Next, FIG. 13 is a perspective view conceptually showing a tenth embodiment of the capacitive moisture sensor according to the present invention. In this embodiment, a linear shape is provided between sensing enamel wires 3 and 4. The body 21 is arranged.

  In this configuration, moisture can be retained by the surface tension in the lattice formed by the sensing enamel wires 3 and 4 and the linear body 21, so that measurement can be stabilized and sensitivity can be increased.

  Next, FIGS. 14 to 22 show an eleventh embodiment of a capacitive moisture sensor according to the present invention. This embodiment has sensing enamel wires 3 and 4 having rigidity. And it hold | maintains in the adjacent arrangement | positioning state by the support body comprised from the thin-plate-shaped insulating member which can be elastically deformed in the thickness direction.

First, FIG. 14 and FIG. 15 are plan views of a thin plate-like insulating member 101 for constituting a support, and this thin plate-like insulating member 101 is a material that can be elastically deformed in the thickness direction. In this embodiment, A flexible printed circuit board in which a copper foil 103 is provided on the surface of the polyimide plate 102 is used. The left side of the thin plate-like insulating member 101 is formed in a rectangular frame-like portion 104 and the right side is formed with a belt-like plate-like portion 105, and the rectangular frame-like portion 104 is knitted into a lattice network as shown in FIG. The sensing enameled wires 3 and 4 are electrically and mechanically connected and held, and the belt-like portion 105 has sensing enameled wires 3 and 4 and a capacitance detection circuit not shown. A conductor pattern for electrically connecting the two is formed.
is doing.

  That is, the thin plate-like insulating member 101 is processed and, as shown in FIG. 16, two pairs of opposed conductor patterns 106a, 106a; 106b for connecting the sensing enamel wires 3 and 4 to the rectangular frame portion 104. , 106b and conductor patterns 107a, 107b used as lead wires for connecting to the capacitance detection circuit are formed on the band plate-like portion 105. The conductor patterns 107a, 107b It is formed continuously with the respective conductor patterns 106 and 106b on the plate-like portion 105 side.

  In this embodiment, the reinforcing plate 108 is laminated on a part of the back surface on one end side of the band plate-like portion 105. (Refer to FIG. 22) Further, the conductor patterns 106 and 107 formed as described above can be subjected to reinforcement processing such as another metal plating as required.

  Next, as shown in FIG. 17, the coatings on both ends of the sensing enamel wires 3 and 4 knitted in a lattice network are removed, and these coating removal portions 109 are positioned on the conductor patterns 106a and 106b, thereby sensing. The enamel wires 3 and 4 are placed on the rectangular frame-shaped portion 104.

  In this state, the film removing portion 109 is electrically and mechanically joined to the conductor patterns 106a and 106b by welding of solder 110, a conductive adhesive or a conductive sheet.

  Next, as shown in FIGS. 19 to 22, a sensor is configured by laminating an insulating film 111 on the surface side of the thin plate-like insulating member 101 except for a part on one end side of the band plate-like portion 105.

  In the capacitance type moisture sensor configured as described above, the sensing enamel wires 3 and 4 knitted in a lattice network are held by the thin plate-like insulating member 101, so that the thickness of the sensor can be reduced. Since the cylindrical insulating member 101 can be elastically deformed in the thickness direction, the deformable property can follow the surface of the measurement site.

  Therefore, for example, the contact area of the sensing enamel wires 3 and 4 with respect to the surface of the measurement site in the oral cavity can be increased, so that high sensitivity can be achieved and the surface of the measurement site can be tracked. Further, errors due to different pressing force and contact angle at the time of contact can be reduced.

  In this configuration, when used as a moisture sensor in the oral cavity, it is easy to put the sensor body into and out of the oral cavity, and the mouth can be closed at the time of measurement. Has the advantage of not giving discomfort such as pain.

  In the eleventh embodiment described above, the sensing enamel wires 3 and 4 are formed in a lattice network shape, but can also be formed in a comb-teeth shape or the like in the above-described other embodiments. Of course, the configuration of the sensing enamel wires 3 and 4 can be used.

  In this embodiment, as described above, in the method in which the film removal portion 109 of the sensing enamel wires 3 and 4 is bonded to the conductor patterns 106a and 106b by welding a conductive sheet, the welding temperature is set. Since bonding can be performed at a temperature (160 ± 5 ° C) lower than the temperature at solder 110 (240 ° C or higher), a material that is cheaper than polyimide, such as nylon, is used as the substrate material for the flexible printed circuit board. There is a possibility of being able to do it.

  In the capacitive moisture sensor of the present invention, as described above, it is possible to stably contact the measurement site with a small force with a simple configuration, and the moisture to be measured has the highest electric force line density. Since it can reach the space between high sensing enamel wires, it can perform highly sensitive and efficient measurement, so it has a very high industrial applicability as a sensor for measuring moisture in the oral cavity. is there.

  The electrostatic capacity type moisture sensor of the present invention can be used as a moisture sensor in the oral cavity as described above, and also as a moisture sensor for other parts of the body, for example, the face, etc. It can also be used for the target.

1 is a system diagram including a plan view conceptually showing a first embodiment of a capacitive moisture sensor according to the present invention. It is the sectional view on the AA line of FIG. It is a top view which shows notionally 2nd Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is the BB sectional view taken on the line of FIG. It is a systematic diagram including the top view which shows conceptually 3rd Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is CC sectional view taken on the line of FIG. It is a top view which shows notionally 4th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a top view which shows notionally 5th Embodiment of the capacitive moisture sensor which concerns on this invention. It is a top view which shows notionally 6th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a top view which shows notionally 7th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a top view which shows notionally 8th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a perspective view which shows notionally 9th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a perspective view which shows notionally 10th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a top view which shows the element of 11th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is the DD sectional view taken on the line of FIG. It is a top view which shows the state in the middle of processing the element of FIG. 14 and comprising a sensor. It is a top view which shows the other element of 11th Embodiment of the electrostatic capacitance type moisture sensor which concerns on this invention. It is a top view which shows the state in the middle of processing the element of FIG. 14, FIG. 17 and comprising a sensor. It is a top view which shows the state which processed the element of FIG. 14, FIG. 17 and comprised the sensor. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is the GG sectional view taken on the line of FIG. It is a systematic diagram including a plan view conceptually showing an example of a conventional thin film type capacitive moisture sensor. It is the HH sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitance type | mold moisture sensor 2 Capacitance detection circuit 3, 4 Enamel wire 5 Space 6, 7 Lead wire 8 Conductor 9 Insulation coating 10 Measurement part 11 Electric force line 12 Moisture 13 Binding member 14 Insulator 15 Exposed part 16 Solder 17 Adhesive 18 Square frame 19, 20 Coupling member 21 Linear body 101 Thin plate insulating member 102 Polyimide plate 103 Copper foil 104 Square frame portion 105 Strip plate portions 106a, 106b Conductive patterns 107a, 107b Conductive pattern 108 Reinforcing plate 109 Film removal part 110 Solder 111 Insulation film

Claims (12)

An electrostatic capacitance type moisture sensor characterized in that two systems of sensing enamel wires connected to an electrostatic capacitance detection circuit are held in close proximity through a space. 2. The capacitive moisture sensor according to claim 1, wherein the sensing enamel wire is held in a close-positioned state by a rigid support. The capacitive moisture sensor according to claim 2, wherein the support is an enameled wire. The capacitive moisture sensor according to claim 2, wherein the support is a frame of an enameled wire. The sensing enameled wire is held in a close proximity state by a support body made of a thin plate-like insulating member that has rigidity and is elastically deformable in the thickness direction. Capacitive moisture sensor. The capacitive moisture sensor according to claim 5, wherein the thin plate-like insulating member is a flexible printed circuit board. 2. The capacitive moisture sensor according to claim 1, wherein two systems of sensing enamel wires are held in close proximity due to their own rigidity. The capacitive moisture sensor according to any one of claims 1 to 7, wherein two systems of sensing enamel wires are arranged close to each other in an opposing comb shape. The capacitive moisture sensor according to any one of claims 1 to 7, wherein two systems of sensing enamel wires are arranged close to each other in a parallel meandering shape. The capacitive moisture sensor according to any one of claims 1 to 7, wherein two systems of sensing enamel wires are arranged close to each other in a lattice shape. 11. The capacitance type moisture sensor according to claim 10, wherein two systems of sensing enamel wires arranged close to each other in a lattice shape are knitted in a net shape. The capacitance type moisture sensor according to any one of claims 1 to 11, wherein a linear body is disposed between two systems of sensing enamel wires arranged close to each other.

Images