JP2007200111A - Thermal sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal sensor capable of achieving maintenance and protection of thermal responsiveness which are contrary to each other with respect to a ferroelectric substance . <P>SOLUTION: The thermal sensor 1 includes a heat sensing part 10 for sensing heat in a monitoring area and a casing 41 for fixing the heat sensing part 10, wherein a protection film 30 for protecting the heat sensing part 10 is provided at a position closer to the monitoring area at least than to the heat sensing part 10. Thus, it is possible to prevent water and the like from entering the heat sensing part 10 from the monitoring area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat detector that senses heat in a monitoring area and issues an alarm according to a sensed state.

  Conventionally, heat detectors that detect the occurrence of a fire with the heat generated by the fire have been proposed. This heat sensor is roughly classified into a differential heat sensor and a constant temperature heat sensor based on the sensing principle. Such a heat sensor is generally configured to include a heat-sensitive part that senses heat in a monitoring region, and a sensor body that issues an alarm according to the sensing state of the heat-sensitive part.

  Among these, the heat sensitive unit is configured to include a sensor element that senses heat in the monitoring region and converts the sensed state into another state change. As the sensor element, a diaphragm that is deformed by expansion of air due to a temperature rise, a thermistor whose resistance value changes according to temperature, or a bimetal that deforms in a predetermined direction according to temperature is used.

  FIG. 10 is a longitudinal sectional view of a conventional heat sensor. The heat sensor 100 includes a heat sensitive part 101 and a sensor main body 102, and is installed on a mounting surface such as a ceiling surface C. The thermosensitive part 101 is directly connected to the inside of the sensor body 102 by an adhesive 103 (see, for example, Patent Document 1).

  However, such conventional heat detectors have various problems. That is, in a diaphragm-based heat sensor, a chamber having a certain expansion space is required in order to accurately detect a temperature increase rate of a predetermined value or more. Further, in the thermistor-based heat detector, in addition to the thermistor itself being bulky, a thermistor guide is provided around it to protect the thermistor, so that the heat detector becomes relatively large as a whole. Therefore, it has been difficult to reduce the thickness of the heat sensor. Alternatively, in a bimetal-based heat sensor, it is necessary to secure a deformation space for the bimetal. Therefore, it is difficult to reduce the size of these conventional heat detectors.

  In order to solve such a problem, it has been studied to use a ceramic element, which is a ferroelectric substance that outputs a pyroelectric current by a pyroelectric effect when the temperature changes, as a heat sensing element. Since this ferroelectric substance can be formed into a thin film, it is possible to downsize the entire heat detector by using it as a heat sensing element.

JP 2003-196760 A

  However, when such a ferroelectric substance is specifically put into practical use as a heat sensing element, a mounting structure for securing sufficient environmental resistance while maintaining its thermal response is required. That is, in order to ensure the thermal responsiveness of the ferroelectric material, it is possible to expose the ferroelectric material directly to the monitoring region as much as possible, and to transmit the temperature change in the monitoring region directly to the ferroelectric material. preferable. However, when a ferroelectric substance is simply exposed to the monitoring area, the ferroelectric substance is deformed by an external force received from the monitoring area, or the ferroelectric substance is deteriorated or corroded by various substances entering from the monitoring area. And so on.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a thermal sensor capable of simultaneously achieving the mutually contradictory purposes of maintaining and protecting thermal responsiveness related to a ferroelectric substance. To do.

  In order to solve the above-described problems and achieve the object, a heat sensor according to claim 1 is provided with a heat sensing means for sensing heat in a monitoring region and a housing for fixing the heat sensing means. The apparatus is characterized in that a protection means for protecting the heat sensitive means is provided at least at a position closer to the monitoring area than the heat sensitive means.

  The heat sensor according to claim 2 is the heat sensor according to claim 1, wherein a thin plate-like member is arranged at a position closer to the monitoring region than the heat-sensitive means, and the thin plate-like member has the heat detector. The side surface on the monitoring area side is substantially covered with the protection means, and the heat sensitive means is fixed to the side surface of the thin plate member opposite to the monitoring area side, and the housing is fixed to this side surface. It is characterized by.

  According to a third aspect of the present invention, there is provided the heat sensor according to the first aspect, wherein the heat sensitive means is substantially covered with the protection means.

  According to a fourth aspect of the present invention, there is provided the heat detector according to the third aspect, wherein a thin plate-like member is disposed at a position closer to the monitoring region than the heat sensitive means, and the thin plate-like member has the heat detector. The heat-sensitive means substantially covered with the protection means is fixed to the side surface opposite to the monitoring area side, and the housing is fixed to the side surface.

  The heat sensor according to claim 5 is the heat sensor according to any one of claims 1 to 4, wherein the heat-sensitive means includes a ferroelectric substance.

  The heat sensor according to claim 6 is the heat sensor according to any one of claims 1 to 5, wherein the protection means prevents moisture from entering the heat sensitive means from the monitoring region. It is characterized by being a moisture-proof film.

  The heat sensor according to claim 7 is the heat sensor according to any one of claims 1 to 6, wherein the casing and the thin plate member are formed of substantially the same material. It is characterized by that.

  According to this invention, since the protection means is provided on the monitoring area side of the heat sensitive means, the protection means prevents moisture and corrosive substances from entering from the monitoring area toward the heat sensitive means. Therefore, deterioration and corrosion of the heat sensitive means can be prevented, and the reliability of the heat detector can be maintained over a long period of time.

  In addition, according to the present invention, since the side surface on the monitoring region side of the thin plate member is substantially covered with the protection means, the thin plate member can be similarly protected in addition to the heat sensitive means.

  Further, according to the present invention, the thermal means is substantially covered with the protective means, so that the thermal means can be prevented from being deteriorated and corroded, and the rigidity of the thermal means can be improved to prevent the deformation.

  The best mode for carrying out the invention will be described below. First, [I] after explaining a basic concept common to each embodiment according to the present invention, [II] explaining specific contents of each embodiment, and [III] finally, with respect to each embodiment. A modification will be described. However, the present invention is not limited to each embodiment.

[I] Basic Configuration Common to Each Embodiment First, a basic configuration common to each embodiment will be described. The heat sensor according to each embodiment is installed on a mounting surface such as a ceiling, for example. This heat detector is configured to include a heat sensitive means for sensing heat in the monitoring area, a control means for giving an alarm according to a sensing state by the heat sensitive means, and a housing for protecting the control means.

  One of the features of the heat sensor according to each embodiment is the protection structure of the heat sensitive means. That is, when the heat sensitive means is exposed to the monitoring area, the heat sensitive means may be deformed by an external force received from the monitoring area, or may be deteriorated or corroded by various substances. Therefore, in each embodiment, a protection means for protecting the heat sensitive means is provided. With regard to the specific structure and arrangement of the protection means, different forms are adopted in the respective embodiments, and thereby different effects can be obtained.

[II] Specific Contents of Each Embodiment The specific contents of each embodiment will be sequentially described in detail below with reference to the accompanying drawings.

[Embodiment 1]
First, the first embodiment will be described. In the first embodiment, the side surface of the thin plate-like member on the monitoring area side is substantially covered with a protection means.

(About overall structure)
FIG. 1 is a longitudinal cross-sectional view of the heat sensor according to Embodiment 1, and FIG. 2 is a longitudinal cross-sectional view of the heat sensor in a state before connecting the heat-sensitive part and its peripheral part to the housing. As shown in FIGS. 1 and 2, the heat sensor 1 includes a heat sensitive part 10, a protective fixing part 20, a protective film 30, and a sensor main body 40. It is fixed to the mounting surface by a known method.

(About heat sensitive part 10)
Among these, the structure of the heat sensitive part 10 is demonstrated. 3 is a diagram showing the plan view and the longitudinal sectional view of the heat sensitive part and the protective fixing part in association with each other, FIG. 4 is a longitudinal sectional view of each part of FIG. 3 in an exploded state, and FIG. 5 is a plan view of the heat sensitive part. It is the figure which showed the figure and the longitudinal cross-sectional view in relation. The heat sensitive unit 10 senses heat in the monitoring region and outputs a current having a voltage corresponding to the heat, and corresponds to the heat sensitive means in the claims. The heat sensitive unit 10 includes a sensor element 11 and metal electrodes 12 and 13.

  Among these, the sensor element 11 is sensor means for converting the sensed state into another state change. The sensor element 11 outputs, for example, a pyroelectric current due to the pyroelectric effect when the temperature of the monitoring region changes, and is configured as a thin plate-like thermal sensor in which a ferroelectric substance such as ceramic is thinned. . The metal electrodes 12 and 13 are electrode means for outputting the pyroelectric current output from the sensor element 11 to the housing 41 via an electric wire (not shown).

  The heat-sensitive part 10 has a laminated structure in which a metal electrode 12, a sensor element 11, and a metal electrode 13 are sequentially polymerized, and the metal electrode is disposed outside the sensor element 11 (the side facing the monitoring region; hereinafter the same). Reference numeral 13 denotes a metal electrode 12 disposed inside the sensor element 11 (on the opposite side to the monitoring region; the same applies hereinafter). The sensor element 11, the metal electrode 12, and the metal electrode 13 are each formed in a substantially thin disk shape, and are stacked in a substantially concentric disk shape. Here, the diameter of each part increases in the order of the metal electrode 12, the sensor element 11, and the metal electrode 13. The sensor element 11 and the metal electrode 13 are adhered by an adhesive, and the metal electrode 12 is deposited on the sensor element 11.

(Protective fixing part 20)
Further, the protective fixing portion 20 includes a laminated outer material 20a and a laminated inner material 20b. Among these, the laminate outer material 20 a corresponds to the thin plate-like member in the claims, and is disposed outside the metal electrode 13. Further, the laminate inner material 20 b is disposed inside the metal electrode 12. Then, by sandwiching the heat sensitive portion 10 between the laminate outer material 20a and the laminate inner material 20b, the heat sensitive portion 10 can be protected from the external force from the monitoring region and the intrusion of corrosive components. In this respect, the protective fixing part 20 functions as a protective means for protecting the heat-sensitive part 10. Further, as will be described later, the thermosensitive part 10 is fixed to the housing 41 via the protective fixing part 20. In this sense, the protective fixing part 20 functions as a fixing means for fixing the heat-sensitive part 10 to the housing 41. Details of the protective fixing unit 20 will be described later.

(About protective film 30)
Here, the protective film 30 is affixed to the side surface on the monitoring region side of the laminate outer material 20a. This protective film 30 is for preventing the entry of a predetermined substance from the monitoring area into the heat sensitive part 10, and corresponds to the protective means in the claims. Details of the protective film 30 will be described later.

(Regarding the structure of the sensor body)
Next, the configuration of the sensor body 40 will be described. However, unless otherwise specified, the sensor body 40 can be configured in the same manner as a known sensor body. The sensor main body 40 includes a control unit (not shown) and a housing 41.

  The control unit receives the pyroelectric current output from the heat sensitive unit 10 and determines whether or not a fire has occurred by comparing the magnitude of the pyroelectric current with a predetermined threshold value, and according to the determination result. It is a control means which performs an alarm. For example, the control unit is configured as an IC (Integrated Circuit) and a program executed on the IC, and executes predetermined control.

  The housing 41 is a structure of the heat sensor 1 and is a fixing means for fixing the heat sensitive means. Although the specific material and manufacturing method of this housing | casing 41 are arbitrary, the housing | casing 41 is formed by resin molding, for example. As shown in FIGS. 1 and 2, a substantially disc-shaped connection surface portion 41 a is formed inside the vicinity of the lower end portion of the housing 41, and the heat sensitive material sandwiched by the protective fixing portion 20 described above is formed on the connection surface portion 41 a. The part 10 is fixed by welding.

(Details of the protective fixing part 20)
Next, the protective fixing unit 20 will be described in more detail. The laminate outer member 20a and the laminate inner member 20b are formed in a substantially thin disk shape having a diameter sufficiently larger than the heat sensitive part 10 so that the heat sensitive part 10 can be sandwiched between them. Moreover, the diameter of the laminate outer material 20a is larger than that of the laminate inner material 20b so that the outer peripheral portion of the laminate outer material 20a is exposed to the outside of the laminate inner material 20b. And the adhesive material is apply | coated to the surface at the side of the metal electrode 13 of the laminate outer material 20a, and the surface at the side of the metal electrode 12 of the laminate inner material 20b. Therefore, by bonding the laminate outer material 20a and the laminate inner material 20b with the heat sensitive portion 10 interposed therebetween, the heat sensitive portion 10 is sandwiched between the laminate outer material 20a and the laminate inner material 20b.

  Specific materials and dimensions of the laminate outer material 20a and the laminate inner material 20b are arbitrary. For example, the laminate outer material 20a is made of a resin, and the thickness thereof is strength, stress absorption characteristics, ease of formation, and In consideration of heat transferability to the heat sensitive part 10, it is 0.2 mm or less. The laminate inner material 20b is made of resin, and has a thickness of 0.05 mm or less, for example. The heat resistant temperature of the laminate outer material 20a and the laminate inner material 20b is preferably 85 ° C. or higher in consideration of the operating temperature of the heat sensor 1 and the melting temperature of the resin.

  In particular, since the laminate outer material 20 a is directly welded and fixed to the housing 41, it is preferable that the laminate outer material 20 a is formed of substantially the same type of resin as the housing 41. Here, “substantially the same type” means the type of identity that is within a range that can ensure a certain degree of affinity when the laminate outer material 20a and the casing 41 are welded, and is formed of completely the same type of resin. In addition, a case where a different additive is added to the same substrate to form a resin, or a case where the same material is made into a resin under different conditions is included. For example, when the casing 41 is formed of a polycarbonate, the laminate outer material 20a is formed of a polycarbonate film.

  Further, as shown in FIG. 3, the laminate inner member 20b includes a notch 20c. The notch 20c is formed as a notch in a substantially U-groove provided from the outer periphery of the laminate inner member 20b toward the center. Here, by directly soldering an electric wire or the like electrically connected to the control unit to the metal electrode 12 and the metal electrode 13 partially exposed from the notch 20c, the heat-sensitive unit 10 and the control unit are electrically connected. Can be connected. However, the connection method of the electric wire with respect to the metal electrode 12 or the metal electrode 13 is not limited to this structure, and other arbitrary methods can be taken. For example, a small-diameter electric wire connected to the metal electrode 12 or the metal electrode 13 The laminate may be laminated together with the metal electrode 12 and the metal electrode 13 with the laminate outer material 20a and the laminate inner material 20b, and the electric wires may be drawn laterally from between the laminate outer material 20a and the laminate inner material 20b.

(Details of the protective film 30)
Next, the protective film 30 will be described in more detail. This protective film 30 is for preventing the entry of a predetermined substance from the monitoring area into the heat sensitive part 10, and corresponds to the protective means in the claims. Here, as the predetermined substance, all kinds of single type or plural types capable of degrading or corroding the thermosensitive part 10 are applicable, and a material corresponding to the predetermined substance can be selected. For example, when the predetermined substance is moisture, a moisture-proof film for preventing moisture from entering can be selected as the protective film 30. Alternatively, when corrosive gases (sulfur dioxide (SO 2), hydrogen sulfide (H 2 S), nitrogen dioxide (NO 2), chlorine (Cl 2), etc.) are assumed as the predetermined substance, these protective gases 30 are used as the protective film 30. A fluororesin film for preventing infiltration can be selected.

  The protective film 30 is disposed on at least the side surface on the monitoring region side of both side surfaces of the laminate outer material 20a. More specifically, the protective film 30 is formed in a circular thin plate shape having substantially the same diameter as the laminate outer material 20a, and substantially completely covers the side surface of the laminate outer material 20a. Therefore, it is possible to prevent the predetermined substance from the monitoring region from passing through the laminate outer material 20a and reaching the heat sensitive part 10. Further, the protective film 30 may be provided in a wider range. For example, the whole including both side surfaces of the laminated outer material 20a may be covered with the protective film 30. However, since the laminate outer material 20a is directly welded and fixed to the housing 41 as will be described later, the contact portion with the housing 41 is not disturbed by the protective film 30. About, it is preferable to cut out the protective film 30.

  The thickness of the protective film 30 can be arbitrarily determined as long as the entry of a predetermined substance can be prevented, and may vary depending on the material, how many layers are provided, etc. It is preferable to make the protective film 30 as thin as possible so as not to inhibit transmission. For example, the protective film 30 is formed in a film shape having a thickness of about 50 to 100 μm and fixed to the side surface of the laminate outer material 20a. In addition, the specific fixing method of the protective film 30 to the laminate outer material 20a is arbitrary, and different fixing methods can be adopted depending on the material of the laminate outer material 20a and the protective film 30. For example, a thin double-sided tape, a thinly applied adhesive The protective film 30 can be fixed to the laminate outer material 20a by an agent or vapor deposition.

  The main effects of the protective film 30 configured as described above are as follows. That is, as described above, the protective fixing unit 20 functions as a protective unit that protects the heat sensitive unit 10. However, since the protective fixing part 20 also has a function as a fixing means for fixing the thermosensitive part 10 to the casing 41, considering the mutual bondability between the laminate outer material 20a and the casing 41, these are mutually connected. Preferably, they are formed from substantially the same type of resin, and the choice of materials for forming the laminate outer material 20a is significantly limited. Furthermore, in order to maintain the heat transfer efficiency from the monitoring region to the heat-sensitive part 10, it is preferable that the laminate outer material 20a is as thin as possible, and the shape of the laminate outer material 20a is also limited. Since these materials and shapes are limited, it is difficult to completely prevent moisture and gas from permeating through the laminate outer material 20a. Further, when an adhesive having a high water permeability is used as an adhesive for bonding the laminate outer material 20a and the laminate inner material 20b to each other, the adhesive induces moisture to permeate the laminate outer material 20a. It can be a cause. Accordingly, there is a possibility that moisture or gas may pass through the laminate outer material 20a and touch the heat sensitive part 10, and in this case, the metal electrode 12 or the metal electrode 13 is oxidized, the sensor element 11 is corroded, When moisture enters between the sensor element 11 and the metal electrode 12 or the metal electrode 13, there is a possibility of causing a short circuit. For this reason, in order to protect the heat sensitive part 10, it is useful to construct a second protective structure by the protective film 30 in addition to the protective fixing part 20.

(Effect of Embodiment 1)
As described above, according to the first embodiment, the protective film 30 provided on the laminate outer material 20a can prevent the entry of the predetermined substance from the monitoring region to the heat sensitive part 10, and thus the deterioration and corrosion of the heat sensitive part 10 can be prevented. In particular, by using a moisture-proof film as the protective film 30, it is possible to prevent moisture from entering the heat-sensitive part 10, and to prevent deterioration and short-circuiting of the heat-sensitive part 10. Moreover, since the thin film which does not inhibit heat transfer is used as the protective film 30, the thermal responsiveness of the heat sensitive part 10 can be maintained at a high level. Therefore, it is possible to reconcile the mutually conflicting issues of maintaining and protecting the thermal responsiveness related to the heat sensitive part 10. Furthermore, since the protective film 30 having such an effect is provided on the monitoring region side with respect to the laminate outer material 20a, the laminate outer material 20a can be similarly protected.

(Embodiment 2)
Next, a second embodiment will be described. The heat detector according to the second embodiment has a configuration in which the heat-sensitive means and the electrode means are substantially covered with the protection means. The structure not particularly described is the same as that of the above-described first embodiment, and the same configuration is denoted by the same reference numeral as that used in the first embodiment, and the description thereof will be given as necessary. Omitted.

  6 is a longitudinal cross-sectional view of the heat sensor according to the second embodiment, and FIG. 7 is a vertical cross-sectional view of the heat sensor in a state before connecting the heat-sensitive part and the casing. As shown in FIGS. 6 and 7, the heat sensor 2 includes a heat sensitive part 10, a protective fixing part 20, protective films 50 and 51, and a sensor main body 40.

(About the structure of the protective fixing part 20)
Unlike the first embodiment, the protective fixing unit 20 is configured to include only the laminate outer material 20a on the monitoring region side. That is, the laminated inner material 20b of the first embodiment is omitted, and the function of the laminated inner material 20b is replaced by the protective film 51.

(About the structure of the protective films 50 and 51)
Next, the structure of the protective films 50 and 51 will be described. FIG. 8 is a diagram showing a plan view and a longitudinal sectional view of the heat-sensitive part in a state of being sandwiched between protective films, and FIG. 9 is a longitudinal sectional view of each part of FIG. 8 in an exploded state. The heat sensitive part 10 is covered with a pair of protective films 50 and 51, and is fixed to the protective fixing part 20 via the protective films 50 and 51.

  The protective films 50 and 51 are for preventing the entry of a predetermined substance from the monitoring area into the heat sensitive part 10 and correspond to the protection means in the claims. Specifically, each of the protective films 50 and 51 is a thin resin film similar to the protective film 30 of the first embodiment, has a disk shape with a slightly larger diameter than the heat-sensitive portion 10, and the pair of protective films 50. , 51, the heat-sensitive part 10 is disposed between the protective films 50 and 51. Therefore, the protective film 50 disposed closer to the monitoring area than the heat-sensitive part 10 can prevent moisture and corrosive gas from entering the heat-sensitive part 10, thereby improving the environmental resistance of the heat-sensitive part 10. it can. Furthermore, the protective film 51 disposed on the opposite side of the protective film 50 can prevent moisture and corrosive gas from entering the heat sensitive part 10 from the housing 41, further improving the environmental resistance of the heat sensitive part 10. Can be increased. In particular, since the heat-sensitive part 10 is directly sandwiched between the protective films 50 and 51, the rigidity of the heat-sensitive part 10 can be increased, the heat-sensitive part 10 is reinforced, and the heat-sensitive part 10 is deformed by receiving external force. Can be prevented.

  In addition, although the fixing method of the protective films 50 and 51 with respect to the heat sensitive part 10 or the protective fixing part 20 is arbitrary, for example, first, hot melt is apply | coated to the surface which opposes the heat sensitive part 10 in each protective film 50 and 51. Then, in a state where the heat sensitive part 10 is sandwiched between the protective films 50 and 51, heat is applied to the protective films 50 and 51 to melt the hot melt, whereby the protective films 50 and 51 and the heat sensitive part 10 are mutually connected. Paste to. Next, the protective films 50 and 51 are bonded to the laminated outer material 20a with a thin double-sided tape or a thinly applied adhesive.

(Effect of Embodiment 2)
As described above, according to the second embodiment, in addition to the effects similar to those of the first embodiment, since the heat sensitive part 10 is sandwiched between the protective films 50 and 51, the rigidity of the heat sensitive part 10 can be increased. The heat sensitive part 10 can be prevented from being deformed by receiving external force.

[III] Modifications to Each Embodiment While the embodiments of the present invention have been described above, the specific configuration and means of the present invention are within the scope of the technical idea of each invention described in the claims. It can be arbitrarily modified and improved within. Hereinafter, such a modification will be described.

(Regarding the application field of the present invention)
The application object of the present invention is not limited to the above-described heat sensor, but can be similarly applied to all devices that sense heat in the monitoring area, for example, a fire alarm, a heat detector, or a heat ray sensor. .

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved. For example, even when the deterioration and deformation of the heat-sensitive means cannot be completely prevented by the protection means, the object of the present invention is achieved as long as the deterioration and deformation can be prevented even slightly.

(Thermosensitive part)
The heat sensitive unit may have any configuration as long as it can sense heat in the monitoring region. For example, there may be other components in addition to the sensor element, the metal electrode, and the metal part. Further, the metal electrode and the metal portion may be other metals or conductive materials, and the ferroelectric material of the sensor element may not be in the form of a thin film.

(Protection measures)
As the protective means, in addition to the thin disk-shaped film as described above, an arbitrary-shaped protective means can be used. For example, when the heat-sensitive part is formed in a square shape, square-shaped protection means that matches this shape may be provided. Or you may cover only a part of a heat sensitive part and a protection fixing | fixed part with a protection means. Moreover, when covering both surfaces of the heat sensitive part with the protection means as in the second embodiment, the protection means on the monitoring area side and the protection means on the non-monitoring area side are formed with different thicknesses. Also good.

  The present invention can be applied to various devices such as a heat detector and a fire alarm that detect heat and give an alarm according to the detection state, and a thermal response related to a ferroelectric substance in the heat detector and the fire alarm. It is useful to achieve the mutually contradictory purposes of maintaining and protecting sex at the same time.

1 is a longitudinal sectional view of a heat detector according to Embodiment 1. FIG. It is a longitudinal cross-sectional view of the heat sensor in the state before connecting a heat sensitive part and its peripheral part, and a housing | casing. It is the figure which linked and showed the top view and longitudinal cross-sectional view of a heat sensitive part and a protection fixing | fixed part. It is a longitudinal cross-sectional view of the state which decomposed | disassembled each part of FIG. It is the figure which linked and showed the top view and longitudinal cross-sectional view of a heat sensitive part. 6 is a longitudinal sectional view of a heat detector according to Embodiment 2. FIG. It is a longitudinal cross-sectional view of the heat sensor in the state before connecting a heat sensitive part etc. and a housing | casing. It is the figure which linked and showed the top view and longitudinal cross-sectional view of the heat sensitive part in the state clamped by the protective film. It is a longitudinal cross-sectional view of the state which decomposed | disassembled each part of FIG. It is a longitudinal cross-sectional view of the conventional heat sensor.

Explanation of symbols

1, 2, 100 Heat sensor 10, 101 Thermosensitive part 11 Sensor element 12 Metal electrode 13 Metal electrode 20 Protective fixing part 20a Laminate outer material 20b Laminate inner material 20c Notch 30, 50, 51 Protective film 40, 102 Sensor body 41 Housing 41a Connection surface 103 Adhesive C Ceiling

Claims (7)

In a heat sensor comprising a heat sensing means for sensing heat in a monitoring area, and a housing for fixing the heat sensing means,
A protective means for protecting the thermal means at least at a position on the monitoring area side of the thermal means;
A heat sensor characterized by A thin plate-like member is disposed at a position closer to the monitoring area than the thermal means,
The side surface on the monitoring area side of the thin plate member is substantially covered with the protection means,
The thermosensitive means is fixed to the side surface of the thin plate-like member opposite to the monitoring region side, and the housing is fixed to the side surface.
The heat sensor according to claim 1. Substantially covering the thermal means with the protective means;
The heat sensor according to claim 1. A thin plate-like member is disposed at a position closer to the monitoring area than the thermal means,
Fixing the heat-sensitive means substantially covered by the protection means to the side surface of the thin plate-like member opposite to the monitoring area side, and fixing the housing to the side surface;
The heat sensor according to claim 3. The thermal means comprises a ferroelectric material;
The heat sensor according to any one of claims 1 to 4, wherein: The protection means is a moisture-proof film for preventing moisture from entering the heat-sensitive means from the monitoring area;
The heat sensor according to any one of claims 1 to 5, wherein The casing and the thin plate member are formed from substantially the same material,
The heat sensor according to claim 1, wherein

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