JP7460372B2 - Heat detector - Google Patents

Description

The present invention relates to fire detectors, and in particular to technology that is effective when applied to heat detectors that use thermistors as heat-sensitive elements (sensors).

Heat detectors using a thermistor generally have a thermistor as a heat-sensitive element placed in the center of a dome-shaped casing, and the casing is mounted on the ceiling of a building with the thermistor facing downward. configured to detect occurrences. Further, some fire detector covers are provided with an operation indicator light that can be turned on so that it can be visually determined from the outside that the detector has detected a fire.
Conventionally, many operation indicator lights have a point-emitting type LED installed on the surface of a fire detector. In this case, a structure in which a point-emitting indicator light is installed at a location away from the center of the sensor is common, but this type of operation indicator light has a directional difference in visibility. Therefore, for fire detectors installed on the ceiling, the operation indicator light is placed on the entrance side so that it is easy to see when looking up from below to check the status of the operation indicator light. If the sensor is not installed facing the same direction, it will take time and effort to confirm the operation of the sensor when a fire is detected.

Therefore, in order to eliminate the directionality of the operation indicator light, multiple point-emitting type LEDs are installed on the sensor cover, a point-emitting type LED is installed on the top of the sensor head, or a flat part of the sensor cover is installed. Some are equipped with an indicator light that lights up in a ring shape.
On the other hand, in the case of a general heat sensor, in the manufacturing process, after the heat-sensitive element is soldered to the electronic board, when assembling the electronic board into the sensor housing, the diameter of the heat-sensitive element, which is opened in the housing, is Since the device is assembled by inserting the element into an opening of a certain size, there is a problem in that it is difficult to assemble. Furthermore, since there is no structure to protect the heat-sensitive element when it is mounted on an electronic board, there is a possibility that the heat-sensitive element may be damaged during assembly, and assembly requires skill.

In addition, as a heat sensor having a structure in which a thermistor is mounted on a printed wiring board constituting a fire detection circuit, and an insertion hole from which the thermistor projects is formed in the center of a cover that covers the board, for example, Patent Document 1 and There are some listed in 2.
Further, as a sensor in which a ring-shaped indicator light is provided on the flat part of the cover, for example, there is a sensor described in Patent Document 3.
Further, Patent Document 4 discloses a heat sensor in which a protector covering the head of the thermistor is formed of a translucent resin material, and a confirmation light is provided at the base of the protector to illuminate the entire protector, as disclosed in Patent Document 4 in Embodiment 2. It is listed as.

Japanese Patent Application Publication No. 05-266377 Japanese Patent Application Laid-Open No. 05-225459 Japanese Patent Application Publication No. 2001-14570 JP 2003-36488 A

In the case of heat detectors, it is difficult to install an operation indicator light on the top of the detector because the heat-sensitive element is located there, and if a ring-shaped indicator light is placed on the detector cover as in the detector described in Patent Document 3, there are issues such as increased costs due to the increased number of parts and difficulty in miniaturization. In particular, with heat detectors, the electronic boards have become smaller due to the miniaturization of electronic components, and as a result the detector housings have also become smaller, so it is difficult to arrange a ring-shaped operation indicator light in the structure described in Patent Document 3.

In addition, heat sensors often use a thermistor as the heat-sensitive element, but the thermistor is a thin and delicate element and is supported by soldering the two lead terminals of the element to the electronic board, so it is difficult to assemble. Sometimes it gets damaged during work. Moreover, the thermistor is assembled by installing it upright on an electronic board and inserting the heat-sensitive element through an opening on the surface of the sensor body, but if the opening is small, it is difficult to assemble, and if the opening is made large, dust may get inside the sensor. There was a problem that moisture could easily enter, which could have a negative effect on electronic circuits.

Patent document 4 describes a heat detector with a structure in which a mortar-shaped support member is provided at the base of the thermistor and the head of the thermistor is covered with a protector. As mentioned above, this heat detector has a protector made of a translucent resin material, and a confirmation light is provided at the base of the protector to guide light throughout the protector and cause it to emit light. However, there is no suggestion as to how the light will circulate, and the use of two light-emitting elements poses the problem that good light emission cannot be achieved with this method alone.

The present invention has been made in light of the above-mentioned problems, and its object is to improve the ease of assembly of a heat detector that uses a thermistor as a thermal element, as well as to improve the visibility of the operation indicator light.
Another object of the present invention is to provide a heat detector which can be made compact and has a reduced number of parts, thereby reducing costs.

In order to achieve the above object, the present invention has the following features:
A circuit board on which components constituting a heat-sensitive element and a detection circuit are mounted is housed inside a casing consisting of a main body case and a main body cover that covers the opening side of the main body case, and the main body cover has a circuit board on which components constituting a heat-sensitive element and a detection circuit are mounted. Openings are formed at corresponding positions, and a head member is provided that includes a plurality of rectifying fins that form an inlet through which outside air can flow in, and that forms a space that the tip of the heat-sensitive element faces and that covers the opening. In the heat sensor that is
A cylindrical insertion portion having an inner diameter larger than the diameter of the heat-sensitive element, a conical taper portion extending downward and outward from the lower end of the cylindrical insertion portion, and a flange extending horizontally outward from the lower end of the tapered portion. an element support member made of a light-transmitting material and mounted on the circuit board such that the cylindrical insertion portion is positioned around the heat-sensitive element;
The collar portion of the element support member includes a light introduction portion into which light from a light emitting element mounted on the circuit board can be introduced, and a light that reflects the light introduced from the light introduction portion in the direction of the tapered portion. The structure is such that a reflecting section is provided.

According to the heat sensor having the above configuration, since the element support member has the insertion cylindrical part whose inner diameter is larger than the diameter of the heat-sensitive element and the mortar-shaped taper part, the heat-sensitive element mounted on the circuit board This makes it easier to insert and improve assembly. In addition, a light introduction part capable of introducing light from a light emitting element mounted on a circuit board and a light introduction part capable of introducing light from a light emitting element mounted on a circuit board are provided in a flange provided at the lower end of a mortar-shaped taper part formed of a light-transmitting material. Since a light reflecting part is provided to reflect the light emitted in the direction of the taper part, the entire taper part can be illuminated, and the light emitted from the taper part can be seen from any 360° direction, improving visibility. can be improved. Furthermore, since the element support member also serves as an operation indicator light, it is possible to downsize the sensor, reduce the number of parts, and reduce costs.

Here, it is desirable that a light exit portion protruding downward along the circumferential direction is formed on the peripheral portion of the flange portion of the element support member, and that a slit is formed in the main body cover into which the light exit portion fits and which is exposed on the surface of the main body cover.
Alternatively, the flange portion of the element support member may be formed with a plurality of convex portions arranged in a circumferential direction, and the main body cover may be formed with a plurality of windows into which the convex portions fit and which are exposed on the surface of the main body cover.
The light exit portion is formed, for example, as an annular rib. According to the above-mentioned configuration, the entire tapered portion and the light exit portion formed along the circumferential direction or the plurality of convex portions arranged in the circumferential direction can be illuminated, so that the light emitting area can be increased and the visibility can be further improved.

Moreover, desirably, the inside of the insertion cylindrical portion of the element support member is configured to be filled with resin.
This holds the base of the heat-sensitive element (thermistor) and improves resistance to external forces, making it difficult for dust and moisture to enter the housing space of the circuit board, and preventing dust and moisture from having a negative effect on the circuit board. Can be done.
Preferably, the collar portion of the element support member is provided with a columnar light introducing portion on the opposite side corresponding to the light reflecting portion, and an end surface of the light introducing portion is surface-mounted on the circuit board. The light emitting elements facing each other are configured to face each other.
According to this configuration, a surface-mount type element can be used as the light emitting element, so that the element support member can be easily attached to the circuit board.

Alternatively, the light emitting element is a bullet-shaped element, and a lead terminal is mounted on the circuit board,
A concave light introduction part is provided on the back surface of the flange of the element support member so as to correspond to the light emitting element, and the light introduction part is arranged to face the light emitting element mounted on the circuit board. Configure.
According to this configuration, since it is not necessary to provide the element support member with a columnar light introduction part, the shape of the element support member can be simplified, and component costs can be reduced.

Preferably, the element support member is formed with a locking piece that protrudes toward the circuit board and has a claw at its tip,
The circuit board has a portion around a mounting portion of the heat-sensitive element, and engagement holes through which the hooks of the engagement pieces can be inserted are formed in a number corresponding to the number of the engagement pieces.
The locking piece is inserted into the engagement hole and locked therein, thereby mounting the element support member to the circuit board.

According to the above configuration, the element support member can be attached to the circuit board simply by engaging the locking piece on the element support member with the engagement hole on the circuit board, and since the lower end of the insertion cylindrical portion of the element support member is joined to the surface of the circuit board, resin can be easily filled into the insertion cylindrical portion of the thermistor by facing the nozzle of a dispenser to the inside of the mortar-shaped tapered portion at the top of the element support member.

According to the heat sensor according to the present invention, in a heat sensor using a thermistor as a heat-sensitive element, ease of assembly can be improved, and visibility of an operation indicator light can be improved. Further, according to the present invention, it is possible to realize a heat sensor that can be downsized and reduce the number of parts to reduce costs.

1 is a front cross-sectional explanatory view showing a first embodiment of a heat sensor according to the present invention; FIG. (A) is a front sectional explanatory view showing a specific example of an element support member constituting the heat sensor of the first embodiment, and (B) is a bottom view thereof. FIG. 7 is a front cross-sectional explanatory view showing a second embodiment of the heat sensor according to the present invention. (A) is a front sectional explanatory view showing a specific example of the element support member constituting the heat sensor of the second embodiment, and (B) is a bottom view thereof. 10A and 10B are explanatory front sectional views showing an example of a configuration of an element support member constituting a heat detector according to a modified example, and FIG. It is a front cross-sectional explanatory view which shows the modification of an element support member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a heat detector according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an explanatory front sectional view of a heat detector according to a first embodiment, and FIG. 2 shows a specific example of an element support constituting the heat detector according to the first embodiment.
The heat detector 10 of this embodiment is a detector that uses a thermistor 11 as a heat-sensitive element and can detect a fire by detecting the change in electrical resistance that occurs when air heated by the heat generated by a fire comes into contact with the thermistor 11, and is configured for use by being installed on the ceiling surface of a building with the tip of the thermistor 11 facing downward.

As shown in FIG. 1, the heat sensor 10 of this embodiment has an accommodation recess for accommodating a heat sensing component and can be inserted into a mounting opening provided in the ceiling of a building. The main body case 12 has a cylindrical bottom shape, and the main body cover 13 has a protector portion 13A in the center that covers the tip of the thermistor 11 and is coupled to the main body case 12 so as to cover the lower opening of the main body case 12. The main body case 12 and the main body cover 13 form a housing having a housing space inside. Although not shown, a terminal block is provided on the upper part of the main body case 12 for electrically connecting the wiring arranged on the back surface of the ceiling and the internal circuit board.

The heat sensor 10 also includes a circuit board 14 that is accommodated in a housing recess of the main body case 12 and fixed to a boss portion at the bottom of the main body case 12 by screws (not shown), and the thermistor is located approximately in the center of the circuit board 14. 11 is mounted, and has a cylindrical portion 15a through which the thermistor 11 can be inserted, and an element support member 15 in the shape of an inverted mortar, which is joined to the surface of the circuit board 14 with the base of the thermistor 11 inserted therein. There is. The thermistor 11 is mounted on the circuit board 14, and the base of the thermistor 11 is filled and solidified in the cylindrical part 15a at the top of the element support member 15 through which the base of the thermistor 11 is inserted. It is constructed to support.

The body cover 13 has a body portion which is generally in the shape of a flat disk, with an opening formed in the center of the body portion, and a protector portion 13A provided so as to cover the opening from below.
The circuit board 14 is composed of a printed wiring board on whose top and bottom surfaces electronic components such as resistors, capacitors, and ICs (semiconductor integrated circuits) that constitute an electronic circuit for fire detection are mounted, and approximately in the center of the circuit board 14, the tips of the two lead terminals of the thermistor 11 penetrate the circuit board 14 and protrude from the top surface, and are connected to the circuit board 14 by soldering or the like.
Furthermore, a light emitting element 17 such as an LED (light emitting diode) is surface-mounted on a predetermined portion of the circuit board 14 .

The element support member 15 is made of a translucent material such as polycarbonate resin, and as shown in FIG. a flange portion 15c extending horizontally outward from the lower end of the tapered portion 15b; and a plurality of flange portions (15c) that are erected upward from the outer peripheral surface of the tapered portion 15b and have outward claws at their tips. For example, three (3) locking pieces 15d for attachment are provided. Further, a number of engagement holes corresponding to the number of the locking pieces 15d through which the claws of the locking pieces 15d can be inserted are formed in corresponding parts of the circuit board 14, and the locking pieces 15d support the element. A member 15 is adapted to be attached to the circuit board 14. In addition, in FIG. 1 and FIG. 2, only one of the plurality of (three) locking pieces 15d is shown for convenience of illustration. However, only one locking piece 15d may be provided.

As described above, the element support member 15 has a cone-shaped tapered portion 15b, which allows for easy assembly when mounting the element support member 15 on the circuit board 14 on which the thermistor 11 is mounted. After mounting the element support member 15 on the circuit board 14 by inserting the thermistor 11 through the cylindrical portion 15a, resin can be easily filled into the cylindrical portion 15a for inserting the thermistor by aligning the nozzle of a dispenser to face the inside of the tapered portion 15b.

Further, a step portion (recess) 13b is provided on the upper surface of the opening edge of the disc-shaped main body portion of the main body cover 13, and the lower surface of the collar portion 15c of the element support member 15 is joined to this step portion 13b. It is configured. A film or layer having good light reflectance, such as aluminum, may be formed on the inner surface of the stepped portion 13b of the main body cover 13 to which the flange portion 15c is joined.
Furthermore, a cylindrical light guide portion 15e is provided on the collar portion 15c of the element support member 15, corresponding to the position of the light emitting element 17 mounted on the circuit board 14, and a columnar light guide portion 15e is provided in the light guide portion 15e. A light reflecting portion 15f is provided on a corresponding surface portion (lower surface portion in the figure). The end surface of the light guide portion 15e, that is, the surface facing the light emitting element 17, is formed into a concave shape so that light from the light emitting element 17 can be sufficiently introduced.

As shown in FIG. 2(A), the light reflecting portion 15f has an inclined surface perpendicular to the tapered portion 15b when cut vertically, and is a V-shaped recess (groove) when viewed from the direction of the arrow C in FIG. 2(B). It is formed to reflect the light guided from the light guiding portion 15e in the inclined direction of the tapered portion 15b shown in FIG. 2(A) and in the circumferential direction of the flange portion 15c shown in FIG. 2(B). The surface of the element support member 15 on the circuit board side may be microfabricated with a number of thin linear grooves, so that the entire inner surface of the tapered portion 15b emits light more brightly by reflecting the light that hits the grooves. In addition, microfabrication of the element support member 15 makes it like frosted glass, which has the effect of making it impossible to see inside the sensor from the outside. In addition, fine particles that diffusely reflect light may be mixed into the material forming the element support member 15.

The protector part 13A shown in FIG. 1, which is integrally formed with the main body cover 13, has a plurality of (for example, six) rectifying fins 13c that extend radially in a plan view, and the tips (lower ends in FIG. 1) of these rectifying fins 13c are connected to each other. A disc-shaped head cover 13d to be coupled is provided, and the tip of the thermistor 11 is located in a space surrounded by the plurality of rectifying fins 13c and the head cover 13d, and the airflow is configured to pass between each of the rectifying fins 13c. has been done. The head cover 13d has a diameter smaller than the diameter of the base (upper part in the figure) of the protector part 13A, and is formed to have an inverted trapezoidal shape when the sensor is viewed from the side. Furthermore, although the rectifying fins 13c are arranged vertically in FIG. 1, they may be arranged horizontally (not shown).

In the heat sensor of this embodiment having the above configuration, when the light emitting element 17 is turned on while installed on the ceiling of a building, the entire tapered part 15b of the element support member 15 emits light, Since the light is visible from between the plurality of rectifying fins 13c, that is, from any direction of 360°, there is no directionality for visual recognition. Therefore, there is no need to worry about the angle when installing on the ceiling surface, and the installation work can be completed in a short time. Moreover, the light emitting area is larger than that of a sensor equipped with a conventional point-emitting indicator light, and the light emitted from the tapered portion 15b also hits the surface of the rectifying fin 13c and is reflected, causing an apparent light emission. Visibility is improved because the surface is larger.

Furthermore, in the heat sensor 10 of this embodiment, since the element support member 15 also serves as an operation indicator light, a storage space for the thermistor 11 is formed as in the sensor described in Patent Document 3. Compared to a configuration in which a ring-shaped operation indicator light is formed with a separate member from the component (element support) and attached to the main body cover, the entire sensor can be made smaller, and it is also described in Patent Document 4. The number of parts can be reduced compared to a structure in which the element support, the protector as an indicator light, and the main body cover are made up of separate members like a sensor, thereby achieving cost reduction.

Further, the heat sensor 10 of this embodiment has a configuration in which a mortar-shaped element support member 15 having a relatively large opening is provided and the thermistor 11 is inserted therethrough, so that assembly workability is improved and the element support member 15 Since the gap between the inner wall of the cylindrical portion 15a and the base of the thermistor 11 is filled with resin, the thermistor 11 can be supported in a stable state, and dust and moisture are difficult to enter into the housing space of the circuit board. It is possible to prevent moisture and moisture from having an adverse effect on the circuit board.

Second Example
FIG. 3 is an explanatory front sectional view of the heat detector of the second embodiment, and FIG. 4 shows a specific example of an element support member 15 constituting the heat detector of the second embodiment.
Similar to the heat detector of the first embodiment, the heat detector 10 of the second embodiment includes a thermistor 11 as a heat-sensitive element, a body case 12 that houses a circuit board 14, a body cover 13 having a protector portion 13A that covers the tip of the thermistor 11, and an inverted cone-shaped element support member 15 that is joined to the surface of the circuit board 14. The difference from the heat detector of the first embodiment is that the shape of the element support member 15 is different, and that the shape of the body cover 13 has been changed in accordance with the change in the shape of the element support member 15. The second embodiment will be described below with an emphasis on these differences.

As shown in Figure 4 (A), the element support member 15 in the heat detector 10 of this embodiment has a cylindrical portion 15a, a tapered portion 15b, a flange portion 15c, a locking piece 15d and a light-guiding portion 15e, and differs from the element support member 15 of the first embodiment in that it is provided with a rib-shaped light-emitting portion 15g that protrudes downward along the outer periphery of the flange portion 15c.
In addition, due to the provision of light exit portion 15g, light reflecting portion 15f formed on the surface of flange portion 15c corresponding to light guiding portion 15e is formed so as to form a V shape when cross-sectioned in the vertical direction so as to reflect light from light guiding portion 15e to the outside, i.e., light exit portion 15g, which differs from element support member 15 of the first embodiment.
The light exit portion 15g has a ring shape when viewed from below as shown in Fig. 4(B). The light reflecting portion 15f is formed as a groove having a V-shaped cross section when viewed from the direction of the arrow C in Fig. 4(B) as in the first embodiment.

Furthermore, in association with the provision of a rib-like light-emitting portion 15g that protrudes downward along the outer periphery of the flange portion 15c, a slit 13e is formed in the body cover 13 as shown in Fig. 3, and the light-emitting portion 15g is fitted into this slit 13e so that its head faces the surface of the body cover 13. The slit 13e has a ring shape in a plan view corresponding to the light-emitting portion 15g.
As shown in Fig. 4A, the head of the light output section 15g is formed to have a shape that bulges downward, so that light is emitted from the light output section 15g while spreading due to a lens effect. The back surface of the light output section 15g may be microfabricated with a large number of thin linear grooves, as in the back surface of the tapered section 15b. Also, fine particles that diffusely reflect light may be mixed into the material forming the element support member 15.

In this way, in the second embodiment, the ring-shaped slit 13e is formed in the body cover 13, so that the body cover 13 is divided into an outer plate and an inner plate, but the flow straightening fin 13c of the protector part 13A is made larger than in the first embodiment, and the base of the flow straightening fin 13c is formed to straddle the outer plate and the inner plate. As a result, the outer plate and the inner plate of the body cover 13 are connected to each other by the flow straightening fin 13c, and cannot be separated.

In the heat detector of the second embodiment configured as described above, when the light emitting element 17 is turned on while the heat detector is installed on the ceiling surface of a building, the entire tapered portion 15b of the element support member 15 and the ring-shaped light emitting portion 15g emit light, and the light is visible from between the multiple straightening fins 13c, i.e., from any direction of 360°, so there is no directionality in visibility and the total light emitting area is larger than that of the heat detector of the first embodiment. Also, the light emitted from the light emitting portion 15g illuminates the side surface of the straightening fins 13c, further improving visibility.
Furthermore, although the size of the straightening fins 13c is slightly larger than that of the heat detector of the first embodiment, the size of the main body cover 13 can be made approximately the same as that of the main body cover of the heat detector of the first embodiment, making it possible to reduce the size compared to conventional detectors and to reduce the number of parts as in the first embodiment.

(Modification 1)
FIGS. 5A and 5B show a modification of the heat sensor of the second embodiment. Of these, FIG. 5(A) is a cross-sectional explanatory diagram of the element support member 15, and FIG. 5(B) is a diagram showing the central portion (protector portion) of the main body cover 13 viewed from below. Incidentally, FIG. 5(A) shows a cross section taken along the line AA in FIG. 5(B).

As shown in FIG. 5A, the heat sensor of this modification is formed so that the flange 15c of the element support member 15 protrudes outward, and the surface (lower surface in the figure) of the flange 15c Trapezoidal convex portions 15h close to rectangular shapes are formed in rows in the circumferential direction at a predetermined pitch. Further, as shown in FIG. 5(B), the main body cover 13 is provided with a plurality of windows 13f that are arranged in the circumferential direction and that can fit into the convex portion 15h. The back surface of the convex portion 15h may be microfabricated with a large number of thin linear grooves. Note that the shape of the convex portion 15h is not limited to a trapezoid (pseudo-rectangle), and may be any shape such as a rhombus, circle, or ellipse.
The heat sensor of this modification can also achieve substantially the same effects as the heat sensor of the second embodiment, and can also enhance the design effect.

(Modification 2)
FIG. 6 shows another modification common to the above embodiment.
In the modification shown in FIG. 6, instead of providing the cylindrical light guide 15e on the flange 15c of the element support member 15, a light guide 15e' made of a recess is provided on the back surface of the flange 15c, and the circuit board A bullet-shaped light emitting element 17 is provided at a portion facing the light guide portion 15e'. This light emitting element 17 is mounted by soldering lead terminals to the circuit board 14. Further, the collar portion 15c is provided with a light reflecting portion 15f on the surface (lower surface in the figure) of a portion corresponding to the light guide portion 15e'.
In the modification shown in FIG. 6, the light reflecting portion 15f has a rectangular shape when cut in the vertical direction, but it may be formed into a triangular shape as in FIG. 2. Note that the light reflecting portion 15f is constituted by a recess (groove) having a V-shaped cross section when viewed from the direction of arrow C, similarly to the previous embodiment and the modified example.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, only one light guide portion 15e or 15e' is provided on the flange portion 15c of the element support member 15, but the light guide portions 15e or 15e' may be provided at multiple locations, and multiple light emitting elements 17 may be provided corresponding to the light guide portions 15e or 15e'. Also, in the above embodiment, the taper portion 15b of the element support member 15 is provided with a locking piece 15d for mounting the element support member 15 to the circuit board 14, but the locking piece 15d may be provided on the flange portion 15c.
Furthermore, in the heat detector 10 of the above embodiment, resin is filled only inside the cylindrical portion 15a of the element support member 15, but it is also possible to configure the entire back and front sides of the circuit board 14 to be covered with resin to enhance waterproofing.

10 Heat sensor 11 Thermistor (thermal element)
12 Main body case 13 Main body cover 13A Protector part 13b Step part 13c Rectifying fin 13d Head cover 13e Slit 14 Circuit board 15 Element support member 15a Cylindrical part 15b Tapered part 15c Flange part 15d Locking piece 15e, 15e' Light guiding part 15f Light reflecting part 15g Light output part 15h Convex part 16 Insulating resin (filler)
17 Light emitting element

Claims (7)

A circuit board on which components constituting a heat-sensitive element and a detection circuit are mounted is housed inside a housing consisting of a main body case and a main body cover that covers the opening side of the main body case, and the main body cover has a circuit board on which components constituting a heat-sensitive element and a detection circuit are mounted. Openings are formed at corresponding positions, and a head member is provided that includes a plurality of rectifying fins forming an inlet through which outside air can flow in, and that forms a space facing the tip of the heat-sensitive element and that covers the opening. In the heat sensor that is
A cylindrical insertion portion having an inner diameter larger than the diameter of the heat-sensitive element, a conical taper portion extending downward and outward from the lower end of the cylindrical insertion portion, and a flange extending horizontally outward from the lower end of the tapered portion. an element support member made of a light-transmissive material and mounted on the circuit board such that the cylindrical insertion portion is positioned around the heat-sensitive element;
The collar portion of the element support member includes a light introduction portion into which light from a light emitting element mounted on the circuit board can be introduced, and a light that reflects the light introduced from the light introduction portion in the direction of the tapered portion. A heat sensor characterized by being provided with a reflective section. The heat detector according to claim 1, characterized in that a light-emitting portion that protrudes downward along the circumferential direction is formed on the peripheral edge of the flange of the element support member, and a slit is formed in the main body cover into which the light-emitting portion fits and which is exposed on the surface of the main body cover. A plurality of convex portions are formed in line in the circumferential direction on the collar portion of the element support member, and the convex portions are fitted into the main body cover, and a plurality of convex portions are formed in line with each other along the circumferential direction, and are exposed on the surface of the main body cover. The heat sensor according to claim 1, further comprising a window. A heat detector according to any one of claims 1 to 3, characterized in that the inside of the cylindrical insertion portion of the element support member is filled with resin. The light emitting element is provided with a columnar light introduction part on the opposite side of the collar part of the element support member in correspondence with the light reflection part, and an end surface of the light introduction part is surface mounted on the circuit board. The heat sensor according to any one of claims 1 to 4, wherein the heat sensor is configured such that the two heat sensors face each other. The light emitting element is a bullet-shaped element, and a lead terminal is mounted on the circuit board;
A heat detector as described in any one of claims 1 to 4, characterized in that a concave light introduction portion is provided on the back surface of the flange portion of the element support member corresponding to the light emitting element, and the light introduction portion is configured to face the light emitting element mounted on the circuit board. A locking piece that protrudes toward the circuit board and has a claw at its tip is formed on the element support member,
A number of engagement holes through which claws of the locking pieces can be inserted are formed around a mounting portion of the heat-sensitive element of the circuit board, the number of which corresponds to the number of locking pieces,
The heat sensing device according to claim 1, wherein the element support member is attached to the circuit board by inserting and locking the locking piece into the engagement hole. vessel.

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