Heat sensor

Abstract

To provide a heat sensor in which downsizing of a mounting substrate can be attained and restrictions in the arrangement of a light source device of an indicator lamp can be reduced.SOLUTION: A heat sensor comprises: a sensing section 2 which is exposed in a monitoring region 12 and senses heat; a guard structure 7 which is provided around the sensing section 2 and protects the sensing section 2 from an external force at the side of the monitoring region 12; and an indicator lamp 4 which performs an indication relating to a heat sensor 1. The indicator lamp 4 includes a planar visible part 42 that is at least partially located inside of the guard structure 7 in a planar view and is located around the sensing section 2, and at least a portion of the visible part 42 is visible from the side of the monitoring region 12 over the guard structure 7.SELECTED DRAWING: Figure 1

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 1-3, the indicator light is provided on the outside of a guard structure (thermistor guard) that protects the heat-detecting part when viewed from above. The LED that serves as the light source for both the heat detector 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 lamp is disposed outside the guard structure in a plan view, so the LED and the detector 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 arrangement 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 exposed to a monitored area for detecting heat, a guard structure disposed around the sensing unit for protecting the sensing unit from external forces from the monitored area, and an indicator light for displaying information related to the heat detector, at least a portion of the indicator light being inside the guard structure in a planar view and having a planar visible portion around the sensing unit, and at least a portion of the visible portion being 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, whereby the light source device of the visible portion is disposed in a position close to the sensing portion, thereby making it possible to reduce the size of the mounting board and reduce 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 monitored 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 exposed to a monitored area for detecting heat, a guard structure disposed around the sensing unit for protecting the sensing unit from external forces from the monitored area, and an indicator light for displaying information related to the heat detector, the indicator light being disposed within an area protected by the guard structure and having a planar visible portion, at least a portion of which is exposed and does not overlap 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 the mounting board to be made smaller, and reduces restrictions on the placement of the light source device of the indicator light. Also, according to this aspect, the visible portion is planar, with at least a portion of it exposed and not overlapping with the guard structure in a plan view. This makes it easier for the user to view the visible portion.

[0010] In one embodiment of the heat detector of the present invention, the heat detector further has a mounting board to which the sensing unit is electrically connected, the indicator light has 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 to 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-shaped member having a transparent or semi-transparent light diffusion portion. This allows the light diffusion portion to diffuse the light from the light source device. Therefore, the visible portion can reliably display information related to the heat detector. According to this aspect, the light diffusion section is disposed so as to overlap with the mounting board in a plan view. This shortens the distance between the light source device electrically connected to the mounting board and the light diffusion section. This allows the light from the light source device to be reliably 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] In one aspect of the present embodiment, the heat detector may have a cover portion provided between the mounting board 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 for exposing the visible portion. As a result, even when the cover portion is provided, the visible portion can be provided around the sensing portion such that at least a portion of the visible portion is disposed 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 cover portion and the side of the guard structure facing the visible portion may be a color capable of reflecting 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, so that the heat detector can display information related to 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 visualization portion can be adhered to the mounting substrate or other members surrounding the sensing portion.

[0024] In one embodiment of the heat detector of the present invention, 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 for exposing the visible portion, and the visible portion having a groove portion into which the adhesive can be injected, the groove portion reaching between the sensing portion and the visible portion as well as reaching the cover portion.

[0025] According to this aspect, by injecting adhesive into the groove, the adhesive can be filled 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 board can be sealed, and water, dust, etc. can be prevented from entering between the visible part and the mounting board. In addition, 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 board. Effect of the Invention

[0028] According to one aspect of the present embodiment, the mounting board can be made smaller, and restrictions on the arrangement of the light source device of the indicator lamp can be reduced. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a plan view of a heat detector according to a first embodiment. [Diagram 2] 2 is a cross-sectional view of the heat detector according to the first embodiment taken along line AA. FIG. [Diagram 3] FIG. 2 is a perspective view of a heat detector without a guard structure. [Figure 4] FIG. [Diagram 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. 4 is a perspective view showing a plate-shaped member to which a packing is attached. [Figure 7] 11 is a perspective view showing the heat detector after a plate-shaped member is installed on a mounting board. FIG. [Figure 8] 13 is a perspective view showing the heat detector after the inner cover part has been installed. FIG. [Figure 9] FIG. 11 is a perspective view showing a state in which adhesive is injected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an embodiment 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 duplicated explanations 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 lower side 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 detects heat. In this embodiment, the monitoring area 12 is an area below the ceiling surface 11, which is an area below and around the heat detector 1.

[0032] 1 to 3, the outer cover part 5 is provided on the outer periphery 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 in a vertical direction, with an outer periphery 521 (see FIG. 2) 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 as to open in the vertical direction, and the outer circumferential part is fixed to the inner circumferential part 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] 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 part of the mounting board 3 is disposed vertically above the inner cover part opening 61, and a part 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 part of them 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 air current. The sensing unit 2 is a rod-shaped member. The sensing unit 2 extends in the vertical direction and is disposed 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 unit 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 of a part of the 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 the lower side when installed on the ceiling surface facing upward. The plate-shaped member 43 is disposed with the opening facing in the vertical direction. As shown in FIGS. 1 to 3, the plate-shaped member 43 is disposed so that the sensing unit 2 is inserted into the plate-shaped member opening 44 and surrounds the sensing unit 2 in a plan view. The plate-shaped member 43 is provided with a transparent or opaque light diffusion portion 45. The light diffusion portion 45 has a number of reflective surfaces that reflect light, and each of the many reflective surfaces diffuses the reflected light. 2, the plate-shaped member 43 is disposed vertically below the mounting substrate 3 via annular packing 46. The packing 46 is disposed between the mounting substrate 3 and an inner portion of the plate-shaped member 43 in a plan view. The light source device 41 is electrically connected to the mounting board 3 on the vertically upper side of the light diffusion section 45 of the plate-shaped member 43. Light projected from the light source device 41 travels downward and passes through the light diffusion section 45 of the plate-shaped member 43. In this embodiment, the light source device 41 protrudes downward from the mounting board 3. The plate-shaped member 43 is formed with a recess 431 into which the light source device 41 protruding from the mounting board 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 a plan view is disposed inside the inner cover part opening 61, and the outer part of the plate-shaped member 43 in a plan view is disposed above the inner cover part 6 so as to overlap therewith.

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

[0040] 1 and 3, an adhesive 8 is filled in the groove portion 47 of the plate-shaped member 43 and the underside of the mounting substrate 3 around the sensing portion 2 on the inner side 441 of the plate-shaped member opening 44. The mounting substrate 3, the plate-shaped member 43, and the inner cover portion 6 are bonded together by the adhesive 8. 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, thereby 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 from the monitoring area. The guard structure 7 is disposed below the inner cover part 6 and supported by the outer cover part 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 an annular 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 a ring-shaped member 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 in a 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. The plurality of outer ribs 74 extend radially outward from the outer ring 72 in a plan view 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 FIG. 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 the radially adjacent inner ribs 73 between the inner ring 71 and the outer ring 72, and between the 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. That is, the visible part 42 is positioned between the outer ring 72 and the inner ring 71, and at least a part 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 portion 2, and the light source device 41 are manufactured by a known method and are brought into an assembled state as shown in FIG. 6, packing 46 is attached to the surface (the surface facing mounting board 3) that will be the upper side when plate-like member 43 is installed. Packing 46 is attached to the inner portion of plate-like member 43 in a plan view.

[0050] When assembling, the heat detector 1 is arranged so that its top and bottom are opposite to the orientation when it is installed on the ceiling. In other words, it is arranged so that the top side when it is installed on the ceiling will be the bottom side, and the bottom side when it is installed on the ceiling will be the top side. 7, the plate-like member 43 is placed on the mounting board 3 so that the packing 46 is in contact with the mounting board 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 board 3 and the plate-like member 43, and the plate-like member 43, the sensing part 2, and the part of the mounting board 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 the 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 arranged in a position where it overlaps with the sensing part 2, the visible part 42 (plate-like member 43) and the sensing part 2. In this manner, the heat detector 1 is manufactured.

[0051] According to the heat detector 1 according to the embodiment of the present invention, at least a part of the visible portion 42 is disposed around the sensing portion 2 inside the guard structure 7 in a plan view, and at least a part of the visible portion 42 is visible through the guard structure 7 from the monitored area 12 side. 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, according to this embodiment, the visible portion 42 is disposed 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 it 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 configured as a part of a plate-like member 43 having a transparent or semi-transparent light diffusion portion 45. This allows the light diffusion portion 45 to diffuse the light of the light source device 41. Therefore, the visible portion 42 can reliably indicate the operation of the sensing 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 board 3 in a plan view. This makes it possible to shorten the distance between the light source device 41 electrically connected to the mounting board 3 and the light diffusion section 45. This makes it possible to reliably project light from the light source device 41 onto the light diffusion section 45.

[0054] In the heat detector 1 according to the embodiment of the present invention, the light diffusing portion 45 is disposed 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 such that at least a part of it is disposed 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 board 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 the 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 space between the sensing portion 2 and the visible portion 42 with the adhesive 8 by injecting the adhesive 8 into the groove 47. In addition, 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 board 3. This makes it possible to seal the gap between the visible portion 42 and the mounting board 3, and to prevent water, dust, and the like from entering between the visible portion 42 and the mounting board 3. Furthermore, if a waterproof material is provided between the sensing portion 2 and the visible portion 42, it is possible to prevent the waterproof material from entering between the visible portion 42 and the mounting board 3.

[0059] Although the 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 without departing from the spirit of the present invention. The present invention is not limited by the above description, but is limited only by the scope of the attached claims.

[0060] In the above embodiment, the visible portion 42 is configured by a part of the plate-like member 43 having the 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 the plate-like member 43 having the light diffusion portion 45, so long as it can transmit and display the light from the light source device 41. In addition, 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 disposed so as to surround the periphery of the sensing unit 2. In contrast to this, as long as the visible unit 42 is disposed so as to surround the periphery of the sensing unit 2, the light diffusion unit 45 does not have to be disposed so as 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 is formed with the inner cover part opening 61 that exposes the visible part 42. However, the shape of the inner cover part 6 may be other than the above.

[0063] In the above embodiment, the adhesive 8 (waterproof material) is provided between the sensing unit 2 and the visible unit 42. In contrast, 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 is formed with 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 at which 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 portion 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 in 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 outside 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 thereto. The indicator light 4 may indicate information related to other heat detectors 1 in addition to the operation of the sensing unit 2. The present invention is also applicable to indicator lights that do not indicate the operation of the sensing unit 2 but instead indicate information related to 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 be a display when the heat detector 1 detects a decrease in sensitivity, a decrease in power supply voltage, or the like, or a communication interruption with a higher-level device. The display related to the other heat detector 1 is, 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 a lighting command for the heat detector 1 from a higher-level device. Furthermore, the heat detector 1 may be a wireless heat detector, in which case the indicator light may display an indication according to the strength of the radio waves received from a 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 made to have a color capable of reflecting the visible light emitted from the indicator light 4, so that the guard structure 7 and the inner cover portion 6 appear to shine in addition to the visible portion 42. In this way, the heat detector 1 can display information related to the heat detector 1 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 Adhesives (waterproofing materials) 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 a monitoring area to sense heat; a guard structure provided around the sensing unit to protect the sensing unit from external forces from the monitoring area; and an indicator light for indicating 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 portion of the visible portion is visible through the guard structure from the monitored area side.

2. A sensing portion exposed to a monitoring area to sense heat; a guard structure provided around the sensing unit to protect the sensing unit from external forces from the monitoring area; and an indicator light for indicating 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 portion 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 constituted by a part of a plate-like member having a transparent or semi-transparent light diffusing portion, The heat detector according to claim 3 , wherein the light diffusion portion is disposed so as to overlap with 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 is formed with an opening through which the visible portion is exposed.

7. The heat detector according to claim 6 , wherein at least a part of the cover portion and a side of the guard structure facing the visible portion have a color capable of reflecting visible light emitted from the indicator lamp.

8. The heat detector according to claim 1 , further comprising a waterproof material 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 portion 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 portion is electrically connected, The heat detector according to claim 1 , further comprising a packing provided between the visible portion and the mounting board.

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