thermal sensor

Abstract

A heat detector is provided that can reduce the size of a mounting board and reduce restrictions on the placement of a light source device for an indicator lamp. [Solution] The device comprises a sensing unit 2 exposed to the monitored area 12 and sensing heat, a guard structure 7 arranged around the sensing unit 2 to protect the sensing unit 2 from external forces from the monitored area 12, and an indicator light 4 that displays information about the heat detector 1, at least a portion of which is inside the guard structure 7 in a planar view and has a planar visible portion 42 around the sensing unit 2, and at least a portion of the visible portion 42 is visible through the guard structure 7 from the monitored area 12 side.

Description

[Technical Field]

[0001] The present invention relates to a heat detector. [Background technology]

[0002] Heat detectors are provided with an indicator light to indicate that they are in operation. In the heat detectors disclosed in Patent Documents 1 to 3, the indicator light is provided on the outside of a guard structure (thermistor guard) that protects the heat-sensing part when viewed from above. The LED that serves as the light source for both the sensing part and the indicator light is electrically connected to a built-in mounting board. The plan view refers to the state when viewed from above and below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4625046 [Patent Document 2] Japanese Patent Application Publication No. 08-180273 [Patent Document 3] Patent No. 6681129 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the heat detectors disclosed in Patent Documents 1 to 3, the indicator light is located outside the guard structure in a plan view, so the LED and the sensor are electrically connected to the mounting board at positions separated from each other, which requires the mounting board to be larger and places restrictions on the placement of the LED.

[0005] The present invention provides a heat detector that can reduce the size of a mounting board and reduce restrictions on the placement of a light source device for an indicator lamp. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a heat detector according to one embodiment of the present invention comprises a sensing unit that is exposed to a monitored area and senses heat, a guard structure that is arranged around the sensing unit and protects the sensing unit from external forces from the monitored area, and an indicator light that displays information about the heat detector, at least a portion of which is inside the guard structure in a planar view and has a planar visible portion around the sensing unit, and at least a portion of the visible portion is visible through the guard structure from the monitored area side.

[0007] According to this aspect, at least a portion of the visible portion is disposed inside the guard structure in a plan view and around the sensing portion, thereby disposing the light source device of the visible portion in a position close to the sensing portion, thereby enabling the mounting board to be made smaller and reducing restrictions on the placement of the light source device. According to this aspect, the visible portion is disposed in a planar shape around the sensing portion, and at least a portion of the visible portion is visible from the monitoring area through the guard structure, making it easy for the user to view the visible portion.

[0008] A heat detector according to one embodiment of the present invention comprises a sensing unit that is exposed to a monitored area and senses heat, a guard structure that is disposed around the sensing unit and protects the sensing unit from external forces from the monitored area, and an indicator light that displays information about the heat detector. The indicator light is disposed within the area protected by the guard structure and has a planar visible portion that is exposed at least partially without overlapping with the guard structure in a planar view.

[0009] According to this aspect, the visible portion is disposed within an area protected by the guard structure. This allows the light source device of the visible portion to be disposed in a position close to the sensing portion. This allows for a reduction in the size of the mounting board and reduces restrictions on the placement of the light source device of the indicator light. Furthermore, according to this aspect, the visible portion has a planar shape, at least a portion of which is exposed and does not overlap with the guard structure in a plan view. This makes it easier for the user to see the visible portion.

[0010] In one embodiment of the heat detector of this invention, the heat detector may further have a mounting board to which the sensing unit is electrically connected, the indicator light may have a light source device electrically connected to the mounting board, and the visible unit may display light projected from the light source device.

[0011] According to this aspect, since the visible portion and the sensing portion are disposed in close proximity to each other, the position on the mounting board where the heat detector is electrically connected and the position where the light source device is electrically connected can be disposed in close proximity to each other, which makes it possible to reduce the size of the mounting board and reduce restrictions on the placement of the light source device.

[0012] In a heat detector according to one embodiment of the present invention, the visible portion is formed by a part of a plate-like member having a transparent or translucent light diffusing portion, and the light diffusing portion may be arranged to overlap the mounting substrate in a planar view.

[0013] According to this aspect, the visible portion is formed of a part of a plate-like member having a transparent or translucent light diffusing portion, which can diffuse the light from the light source device, thereby enabling the visible portion to reliably display information related to the heat detector. According to this aspect, the light diffusion section is disposed so as to overlap the mounting substrate in a plan view, thereby shortening the distance between the light source device electrically connected to the mounting substrate and the light diffusion section, thereby ensuring that light from the light source device is projected onto the light diffusion section.

[0014] In the heat detector according to the present embodiment, the light diffusion portion may be disposed so as to surround the periphery of the sensing portion.

[0015] According to this aspect, the user can easily view the visible portion.

[0016] A heat detector according to one aspect of the present invention may have a cover portion provided between the mounting substrate and the guard structure, and the cover portion may have an opening formed therein to expose the visible portion.

[0017] According to this aspect, the cover portion has an opening that exposes the visible portion, so that even when the cover portion is provided, the visible portion can be provided around the sensing portion so that at least a portion of the visible portion is located inside the guard structure in a plan view.

[0018] In a heat detector according to one embodiment of the present invention, at least a portion of the side of the guard structure facing the visible portion and at least a portion of the cover portion may be a color that can reflect visible light emitted from the indicator light.

[0019] According to this aspect, the guard structure can reflect the visible light emitted from the indicator lamp, allowing the heat detector to display information about the heat detector using not only the visible light emitted from the indicator lamp but also the light reflected by the guard structure and the cover.

[0020] In the heat detector according to the present embodiment, a waterproof material may be provided between the sensing portion and the visible portion.

[0021] According to this aspect, the waterproofness of the sensing unit can be improved.

[0022] In the heat detector according to the present embodiment, the waterproof material may be an adhesive.

[0023] According to this aspect, the visible portion can be adhered to the mounting substrate or other members around the sensing portion.

[0024] In one embodiment of the heat detector, the heat detector further has a mounting board to which the sensing portion is electrically connected, and a cover portion provided between the mounting board and the guard structure, the cover portion having an opening that exposes the visible portion, and the visible portion having a groove portion into which the adhesive can be injected, and the groove portion may be configured to reach between the sensing portion and the visible portion as well as reach the cover portion.

[0025] According to this aspect, by injecting adhesive into the groove, the adhesive can fill the gap between the sensing portion and the visible portion. Also, the adhesive injected into the groove and reaching the cover portion can bond the visible portion and the cover portion.

[0026] In the heat detector according to the present embodiment, a packing may be provided between the visible portion and the mounting board.

[0027] According to this aspect, the gap between the visible part and the mounting substrate can be sealed, preventing water, dust, etc. from entering between the visible part and the mounting substrate. Furthermore, if a waterproof material is provided between the sensing part and the visible part, the waterproof material can be prevented from entering between the visible part and the mounting substrate. [Effects of the Invention]

[0028] According to one aspect of this embodiment, it is possible to reduce the size of the mounting board and reduce restrictions on the placement of the light source device of the indicator lamp. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a plan view of a heat detector according to a first embodiment. [Figure 2] 2 is a cross-sectional view of the heat detector according to the first embodiment taken along line AA. FIG. [Figure 3] FIG. 1 is a perspective view of a heat detector without a guard structure. [Figure 4] FIG. [Figure 5] FIG. 2 is a perspective view showing the heat detector before a plate-shaped member is mounted on a mounting board. [Figure 6] FIG. 2 is a perspective view showing a plate-shaped member to which a packing is attached. [Figure 7] FIG. 10 is a perspective view showing the heat detector after the plate-shaped member is installed on the mounting board. [Figure 8] FIG. 10 is a perspective view showing the heat detector after the inner cover part has been installed. [Figure 9] FIG. 10 is a perspective view showing a state in which adhesive is injected. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are designated by the same reference numerals, and redundant description will be omitted.

[0031] A heat detector 1 according to an embodiment of the present invention shown in Figures 1 and 2 is attached to a ceiling surface 11. The heat detector 1 shown in Figure 1 shows the surface that will be the underside when attached to the ceiling surface 11. The heat detector 1 has a circular shape when viewed from above and below. The heat detector 1 has a sensing unit 2, a mounting board 3, an indicator light 4, an outer cover unit 5, an inner cover unit 6 (cover unit), and a guard structure 7. The sensing unit 2 is exposed to a monitoring area 12 and senses heat. In this embodiment, the monitoring area 12 is the area below the ceiling surface 11, which is the area below and around the heat detector 1.

[0032] 1 to 3, the outer cover part 5 is provided on the outer peripheral side of the heat detector 1 in a plan view. In Fig. 3, the heat detector 1 is shown upside down, and the guard structure 7 is omitted. The outer cover part 5 has a cylindrical part 51 and an annular part 52. The cylindrical part 51 is a cylindrical member. The cylindrical part 51 is provided on the outer periphery of the heat detector 1 in a plan view, with an opening in the vertical direction. An upper end part 511 (see FIG. 2) of the cylindrical part 51 is in contact with the ceiling surface 11. The annular part 52 is an annular member having a circular annular part opening 53 on the inside. The annular part 52 is provided on the outer periphery 521 (see FIG. 2) with an opening in the vertical direction, and an outer periphery edge 521 (see FIG. 2) is connected to a lower end part 512 (see FIG. 2) of the cylindrical part 51. In this embodiment, the cylindrical part 51 and the annular part 52 are integrally formed.

[0033] The inner cover part 6 is fitted into the annular part opening 53 of the annular part 52. The inner cover part 6 is an annular member having a circular inner cover part opening 61 on the inside. The inner cover part 6 is oriented so that it opens in the vertical direction, and its outer periphery is fixed to the inner periphery of the annular part 52. The inner cover part opening 61 is located in the center of the heat detector 1 in a plan view.

[0034] As shown in FIG. 2, the mounting board 3 is disposed inside the outer cover part 5 and above the inner cover part 6. The mounting board 3 is disposed in the center of the heat detector 1 in a plan view. A portion of the mounting board 3 is disposed vertically above the inner cover part opening 61, and a portion is disposed vertically above the inner cover part 6. The components of the heat detector 1, such as the control unit, are disposed inside the outer cover part 5 and above the inner cover part 6, and a portion is electrically connected to the mounting board 3.

[0035] The sensing unit 2 is a detection element that detects temperature due to heat or hot airflow. The sensing unit 2 is a rod-shaped member. The sensing unit 2 extends vertically and is arranged in the center of the heat detector 1 in a plan view. The sensing unit 2 passes through the inner cover opening 61. The upper side of the sensing unit 2 is electrically connected to the mounting board 3. The lower side of the sensing unit 2 protrudes downward beyond the inner cover 6.

[0036] The indicator light 4 indicates the operation of the sensing unit 2. The indicator light 4 has a light source device 41 (see FIG. 2) and a visible unit 42. The light source device 41 is, for example, an LED element, and is electrically connected to the mounting board 3. The indicator light 4 of this embodiment has two light source devices 41. The light source devices 41 are arranged on both sides of the sensing unit 2 in a plan view.

[0037] The visible portion 42 is formed by a part of a plate-shaped member 43. As shown in FIG. 4, the plate-shaped member 43 is an annular, plate-shaped member having a circular plate-shaped member opening 44 on the inside. FIG. 4 shows the plate-shaped member 43 with the surface that will be on the bottom when installed on a ceiling surface facing up. The plate-shaped member 43 is arranged with its opening facing up and down. As shown in FIGS. 1 to 3, the sensing unit 2 is inserted into the plate-shaped member opening 44 of the plate-shaped member 43, and the plate-shaped member 43 is arranged to surround the sensing unit 2 in a plan view. The plate-shaped member 43 has a transparent or opaque light diffusion portion 45. The light diffusion portion 45 has multiple reflective surfaces that reflect light, and each of the multiple reflective surfaces diffuses the reflected light. 2, the plate-like member 43 is disposed vertically below the mounting substrate 3 via an annular packing 46. The packing 46 is disposed between the mounting substrate 3 and the inner portion of the plate-like member 43 in a plan view. The light source device 41 is electrically connected to the mounting substrate 3 on the vertically upper side of the light diffusion portion 45 of the plate-shaped member 43. Light emitted from the light source device 41 travels downward and passes through the light diffusion portion 45 of the plate-shaped member 43. In this embodiment, the light source device 41 protrudes downward from the mounting substrate 3. The plate-shaped member 43 is formed with a recess 431 into which the light source device 41 protruding from the mounting substrate 3 is inserted. By inserting the light source device 41 into the recess 431 of the plate-shaped member 43, the positioning of the plate-shaped member can be easily performed.

[0038] The inner cover part 6 is disposed below the plate-shaped member 43. The inner part of the plate-shaped member 43 in plan view is disposed inside the inner cover part opening 61, and the outer part of the plate-shaped member 43 in plan view is disposed above the inner cover part 6, overlapping it.

[0039] Grooves 47 extending in the radial direction are formed on the lower surface of the plate-like member 43. In this embodiment, two grooves 47 are provided. The inner end of each groove 47 in plan view reaches the mounting board 3 around the sensing unit 2, and the outer end reaches the inner peripheral edge 62 of the inner cover unit 6 (the edge of the inner cover unit opening 61).

[0040] 1 and 3, an adhesive 8 is filled in the groove 47 of the plate-shaped member 43 and the inside 441 of the plate-shaped member opening 44, under the mounting substrate 3 around the sensing unit 2. The adhesive 8 bonds the mounting substrate 3, the plate-shaped member 43, and the inner cover unit 6 together. The adhesive 8 also has waterproof properties. The adhesive 8 seals the sensing portion 2 and the mounting substrate 3 around the sensing portion 2, ensuring waterproof properties.

[0041] 1 and 2, the guard structure 7 is a thermistor guard or the like, which is provided around the sensing unit 2 and protects the sensing unit 2 from external forces in the monitoring area. The guard structure 7 is disposed below the inner cover 6 and is supported by the outer cover 5. The guard structure 7 has an inner ring 71, an outer ring 72, an inner rib 73, and an outer rib 74.

[0042] The inner ring 71 is a circular ring-shaped member. The inner ring 71 is disposed below the sensing unit 2 with its opening facing up and down. In plan view, the center of the inner ring 71 and the sensing unit 2 are disposed so as to overlap each other.

[0043] The outer ring 72 is an annular member that is larger than the inner ring 71. The outer ring 72 is arranged coaxially with the inner ring 71 and opens in the vertical direction. The inner peripheral edge of the outer ring 72 and the outer peripheral edge of the inner ring 71 are arranged with a gap between them. The outer ring 72 is located above the inner ring 71. The sensing unit 2 is arranged inside the inner ring 71.

[0044] The inner rib 73 connects the inner ring 71 and the outer ring 72. The inner rib 73 is a rod-shaped member. A plurality of inner ribs 73 are provided. The plurality of inner ribs 73 are arranged at intervals in the circumferential direction, extending radially from the inner ring 71 toward the outer ring 72 in a plan view. One end of each of the plurality of inner ribs 73 is connected to the inner ring 71, and the other end is connected to the outer ring 72.

[0045] The outer rib 74 is connected to the outer ring 72 and fixed to the outer cover part 5. The outer rib 74 is a rod-shaped member. A plurality of outer ribs 74 are provided. In a plan view, the plurality of outer ribs 74 extend radially outward from the outer ring 72 and are arranged at intervals in the circumferential direction. One end of each of the plurality of outer ribs 74 is connected to the outer ring 72 and the other end is fixed to the outer cover part 5. The annular part 52 of the outer cover part 5 is provided with a fixing part 54 (see Figure 1) that fixes the outer rib 74 to the edge part of the annular part opening 53.

[0046] The guard structure 7 has openings on the inside of the inner ring 71, between radially adjacent inner ribs 73 between the inner ring 71 and the outer ring 72, and between radially adjacent outer ribs 74 between the outer rib 74 and the outer cover part 5. These openings are configured to allow air to pass through. The guard structure 7 is disposed inside the annular opening 53 of the outer cover part 5 in a plan view. The openings between the inner ribs 73 and the openings between the outer ribs 74 are designed to be large enough to prevent fingers from entering.

[0047] The inner rib 73 and the outer rib 74 are both positioned inside the inner peripheral edge of the outer cover part 5 in a plan view. The inner rib 73 is positioned inside the inner peripheral edge 62 of the inner cover part 6 in a plan view. The outer rib 74 is positioned outside the inner peripheral edge 62 of the inner cover part 6 in a plan view. The part of the visible part 42 (plate-shaped member 43) that is positioned inside the inner cover part opening 61 is positioned inside the outer ring 72 in a plan view. The inner peripheral edge of the visible part 42 almost overlaps with the inner ring 71 in a plan view. In other words, the visible part 42 is positioned between the outer ring 72 and the inner ring 71, and at least a portion of the visible part 42 is exposed to the monitoring area 12 without overlapping with the guard structure 7, and is visible to the user from the monitoring area 12 through the guard structure 7.

[0048] The light source device 41 is disposed in a portion of the visible portion 42 that is disposed inside the inner cover portion opening 61, i.e., at a position that does not overlap in the vertical direction with the inner cover portion 6. Therefore, the light source device 41 is also disposed inside the outer ring 72 in a plan view.

[0049] Next, a method for manufacturing the heat detector 1 according to this embodiment will be described. The mounting substrate 3, the sensing unit 2, and the light source device 41 are manufactured by a known method and are assembled as shown in FIG. 6, packing 46 is attached to the surface (the surface facing the mounting board 3) that will be the upper side when the plate-like member 43 is installed. The packing 46 is attached to the inner part of the plate-like member 43 in a plan view.

[0050] When assembling, the heat detector 1 is placed so that its top and bottom are facing in the opposite direction to when it is installed on the ceiling. In other words, the top side when it is attached to the ceiling will be the bottom side, and the bottom side when it is attached to the ceiling will be the top side. 7, the plate-like member 43 is placed on the mounting substrate 3 so that the packing 46 is in contact with the mounting substrate 3. Inside the plate-like member 43, the sensing unit 2 is disposed. The inner cover part 6 is installed as shown in Fig. 8. The inner cover part 6 is placed on the mounting substrate 3 and the plate-like member 43, and the plate-like member 43, the sensing part 2, and the part of the mounting substrate 3 around the sensing part 2 are exposed from the inner cover part opening 61. 9, adhesive 8 is injected into groove 47 of plate-shaped member 43, and adhesive 8 fills groove 47 and the inside of plate-shaped member opening 44 of plate-shaped member 43. Adhesive 8 is cured. The outer cover part 5 and guard structure 7 are attached to the mounting board 3, the sensing part 2, the indicator light 4 and the inner cover part 6, and the guard structure 7 is positioned so as to overlap the sensing part 2, the visible part 42 (plate-like member 43) and the sensing part 2. In this way, the heat detector 1 is manufactured.

[0051] In the heat detector 1 according to the embodiment of the present invention, at least a part of the visible portion 42 is arranged around the sensing unit 2 inside the guard structure 7 in a plan view, and at least a part of the visible portion 42 is visible from the monitored area 12 side through the guard structure 7. This allows the light source device 41 to be arranged in close proximity to the sensing unit 2. This makes it possible to reduce the size of the mounting board 3 and reduce restrictions on the arrangement of the light source device 41. Furthermore, according to this embodiment, the visible portion 42 is arranged in a planar shape around the sensing unit 2, and at least a part of the visible portion 42 is visible from the monitored area 12 side through the guard structure 7. This makes it easy for the user to view the visible portion 42.

[0052] Furthermore, in the heat detector 1 according to the embodiment of the present invention, the visible portion 42 is disposed within an area protected by the guard structure. This allows the light source device 41 to be disposed in a position close to the sensing portion 2. This allows the mounting board 3 to be made smaller, and also reduces restrictions on the placement of the light source device 41. Furthermore, in the heat detector 1 according to the embodiment of the present invention, the visible portion 42 has a planar shape such that at least a part of the visible portion 42 is exposed and does not overlap with the guard structure 7 in a plan view. This makes it easy for the user to view the visible portion 42.

[0053] In the heat detector 1 according to the embodiment of the present invention, the visible portion 42 is formed from a part of a plate-like member 43 having a transparent or translucent light diffusion portion 45. This allows the light diffusion portion 45 to diffuse the light from the light source device 41. Therefore, the visible portion 42 can reliably indicate the operation of the detection unit 2. Furthermore, in the heat detector 1 according to the embodiment of the present invention, the light diffusion section 45 is disposed so as to overlap with the mounting substrate 3 in a plan view. This makes it possible to shorten the distance between the light source device 41 electrically connected to the mounting substrate 3 and the light diffusion section 45. This allows the light from the light source device 41 to be reliably projected onto the light diffusion section 45.

[0054] In the heat detector 1 according to the embodiment of the present invention, the light diffusion portion 45 is arranged so as to surround the periphery of the sensing portion 2. This makes it easier for the user to visually recognize the visible portion .

[0055] In the heat detector 1 according to the embodiment of the present invention, the inner cover part 6 is formed with an inner cover part opening 61 that exposes the visible part 42. As a result, even when the inner cover part 6 is provided, the visible part 42 can be provided around the sensing part 2 so that at least a part of it is positioned inside the guard structure 7 in a plan view.

[0056] In the heat detector 1 according to the embodiment of the present invention, an adhesive 8 (waterproof material) is provided between the sensing portion 2 and the visible portion 42. This allows the visible portion 42 to be adhered to the mounting substrate 3 around the sensing portion 2, other members, etc. Furthermore, according to the heat detector 1 according to the embodiment of the present invention, the waterproofness of the sensing part 2 can be improved.

[0057] In the heat detector 1 according to the embodiment of the present invention, a groove 47 into which adhesive 8 can be injected is formed in the visible portion 42, and the groove 47 reaches between the sensing portion 2 and the visible portion 42 and also reaches the inner cover portion 6. This makes it possible to fill the gap between the sensing portion 2 and the visible portion 42 with adhesive 8 by injecting the adhesive 8 into the groove 47. Furthermore, the adhesive 8 injected into the groove 47 and reaching the inner cover portion 6 can bond the visible portion 42 and the inner cover portion 6 together.

[0058] In the heat detector 1 according to the embodiment of the present invention, a packing 46 is provided between the visible portion 42 and the mounting substrate 3. This seals the gap between the visible portion 42 and the mounting substrate 3, preventing water, dust, and the like from entering between the visible portion 42 and the mounting substrate 3. Furthermore, if a waterproof material is provided between the sensing portion 2 and the visible portion 42, the waterproof material can be prevented from entering between the visible portion 42 and the mounting substrate 3.

[0059] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of the configuration are possible within the scope of the present invention. The present invention is not limited by the above description, but is limited only by the scope of the appended claims.

[0060] In the above embodiment, the visible portion 42 is configured by a part of a plate-like member 43 having a transparent or translucent light diffusion portion 45, and the light diffusion portion 45 is disposed so as to overlap the mounting substrate 3 in a plan view. In contrast, the visible portion 42 does not have to be configured by a plate-like member 43 having a light diffusion portion 45, as long as it can transmit and display light from the light source device 41. Furthermore, the shape of the visible portion 42 does not have to be plate-like or annular.

[0061] In the above embodiment, the light diffusion unit 45 is arranged to surround the periphery of the sensing unit 2. In contrast to this, as long as the visible unit 42 is arranged around the periphery of the sensing unit 2, the light diffusion unit 45 does not have to be arranged to surround the periphery of the sensing unit 2.

[0062] In the above embodiment, the inner cover part 6 is provided between the mounting board 3 and the guard structure 7, and the inner cover part 6 has an inner cover part opening 61 that exposes the visible part 42. However, the shape of the inner cover part 6 may be other than that described above.

[0063] In the above embodiment, an adhesive 8 (waterproof material) is provided between the sensing unit 2 and the visible unit 42. However, a waterproof material other than the adhesive 8 may be provided between the sensing unit 2 and the visible unit 42, or a waterproof material may not be provided as long as waterproofness can be ensured.

[0064] In the above embodiment, the visible portion 42 has a groove 47 into which the adhesive 8 can be injected, and the groove 47 reaches between the sensing portion 2 and the visible portion 42 and also reaches the inner cover portion 6. However, the position where the adhesive 8 is injected may be other than the above, and the visible portion 42 may not necessarily have a groove 47.

[0065] In the above embodiment, the packing 46 is provided between the visible portion 42 and the mounting substrate 3. However, the packing 46 does not necessarily have to be provided between the visible portion 42 and the mounting substrate 3.

[0066] In the above embodiment, the guard structure 7 has an inner ring 71, an outer ring 72, an inner rib 73, and an outer rib 74. However, the guard structure 7 may have a form other than the above as long as it can protect the sensing unit 2. Furthermore, in the above embodiment, the visible portion 42 is disposed between the outer ring 72 and the inner ring 71 of the guard structure 7 in a plan view, but this is not limited thereto, and it is sufficient that the visible portion 42 is disposed inside the inner peripheral edge of the outer cover portion 5 in a plan view, that is, inside the guard structure 7 in a plan view. For example, the visible portion 42 may be present on the entire portion exposed from the annular portion opening 53 of the inner cover portion 6, or the visible portion 42 may be present only on the outside of the outer ring 72. It is sufficient that at least a portion of the visible portion 42 is disposed inside the guard structure 7 in a plan view.

[0067] In the above embodiment, the indicator light 4 indicates the operation of the sensing unit 2, but this is not limited to this. The indicator light 4 may also indicate the operation of other heat detectors 1 in addition to the operation of the sensing unit 2. The indicator light 4 may also be an indicator light that does not indicate the operation of the sensing unit 2 but indicates the operation of other heat detectors 1. The display related to the other heat detector 1 is, for example, a display related to an abnormality in the heat detector 1. It may also be a display when the heat detector 1 detects a loss of communication with a higher-level device, such as a decrease in sensitivity or a drop in power supply voltage. The display related to the other heat detector 1 is also, for example, a display accompanying a response from the heat detector 1. It may be a display when the heat detector 1 responds based on a remote operation test or lighting command to the heat detector 1 from a higher-level device. The heat detector 1 may also be a wireless heat detector, in which case the indicator light may display an indication depending on the strength of the radio waves received from the wireless repeater.

[0068] At least a part of the side of the guard structure 7 facing the visible portion 42 and the inner cover portion 6 may be colored to reflect the visible light emitted from the indicator light 4, so that the guard structure 7 and the inner cover portion 6 appear to glow in addition to the visible portion 42. In this way, the heat detector 1 can display information about itself using not only the visible light emitted from the indicator light 4 but also the light reflected by the guard structure 7 and the inner cover portion 6. [Explanation of symbols]

[0069] 1 heat detector 2 Sensing part 3 Mounting board 4 Indicator light 6 Inner cover part (cover part) 7 Guard structure 8 Adhesive (Waterproofing Material) 12 Monitoring area 41 Light source device 42 Visible part 43 Plate-shaped members 45 Light diffusion section 46 Gasket 47 Groove 61 Inner cover opening (opening)

Claims

1. a sensing portion exposed to the monitoring area to sense heat; a guard structure provided around the sensing unit to protect the sensing unit from external forces on the monitoring area side; and an indicator light that displays information about the heat detector; The indicator light is At least a part of the guard structure is inside the guard structure in a plan view and has a planar visible portion around the sensing portion, A heat detector in which at least a part of the visible portion is visible through the guard structure from the monitoring area side.

2. a sensing portion exposed to the monitoring area to sense heat; a guard structure provided around the sensing unit to protect the sensing unit from external forces on the monitoring area side; and an indicator light that displays information about the heat detector; The indicator light is A heat detector that is arranged within an area protected by the guard structure and has a planar visible portion, at least a portion of which is exposed and does not overlap with the guard structure in a plan view.

3. The heat detector further includes a mounting substrate to which the sensing unit is electrically connected, the indicator lamp has a light source device electrically connected to the mounting board, 3. The heat detector according to claim 1, wherein the visible portion displays light projected from the light source device.

4. the visible portion is configured as a part of a plate-like member having a transparent or translucent light diffusing portion, The heat detector according to claim 3 , wherein the light diffusion portion is disposed so as to overlap the mounting substrate in a plan view.

5. The heat detector according to claim 4 , wherein the light diffusion portion is disposed so as to surround the periphery of the sensing portion.

6. a cover portion provided between the mounting board and the guard structure; The heat detector according to claim 3 , wherein the cover portion has an opening for exposing the visible portion.

7. The heat detector according to claim 6, wherein at least a portion of the cover portion and a side of the guard structure facing the visible portion are colored to reflect visible light emitted from the indicator light.

8. The heat detector according to claim 1 , wherein a waterproof material is provided between the sensing portion and the visible portion.

9. The heat detector according to claim 8, wherein the waterproof material is an adhesive.

10. The heat detector further includes a mounting substrate to which the sensing unit is electrically connected, a cover portion provided between the mounting board and the guard structure; an opening for exposing the visible portion is formed in the cover portion; a groove into which the adhesive can be injected is formed in the visible portion; The heat detector according to claim 9 , wherein the groove portion extends between the sensing portion and the visible portion and also extends to the cover portion.

11. The heat detector further includes a mounting substrate to which the sensing unit is electrically connected, The heat detector according to claim 1 , further comprising a packing provided between the visible portion and the mounting substrate.

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