JP7473592B2 - sensor - Google Patents

Description

The present invention relates to fire detectors (hereinafter referred to as detectors) such as heat detectors and smoke detectors that detect heat and smoke during a fire, and in particular to detectors equipped with speakers.

Conventional detectors have been proposed that include a head cover attached to the bottom of the housing and a speaker housed in the head cover (see, for example, Patent Document 1). The head cover of the smoke detector in Patent Document 1 is a bottomed tubular member that has a bottom surface and a peripheral wall. An air window is formed in the peripheral wall of the head cover through which smoke can pass, and a sound hole is formed in the bottom surface of the head cover to pass sound waves generated by the speaker.

JP 2005-352932 A (for example, paragraphs 0066-0069 and FIG. 7)

In Patent Document 1, sound waves caused by vibrations of the lower surface (front surface) of the speaker are propagated into the living space through sound holes in the bottom surface of the head cover, and sound waves caused by vibrations of the upper surface (back surface) of the speaker are propagated into the living space through air windows in the peripheral wall of the head cover. Here, the sound waves caused by vibrations of the lower surface of the speaker and the sound waves caused by vibrations of the upper surface of the speaker are in opposite phase. For this reason, the sound waves propagated into the living space through the air windows in the peripheral wall of the head cover are weakened by the sound waves propagated into the living space through sound holes in the bottom surface of the head cover. Therefore, when the speaker of the smoke detector in Patent Document 1 generates sound, there is an issue that the range in which a certain level of sound pressure can be secured is narrowed.

The present invention was made to solve the above problems, and aims to provide a detector that can expand the range in which a certain level of sound pressure can be maintained.

The detector of the present invention comprises a housing having a cylindrical side portion with an opening through which smoke flows , a fire detection unit provided within the housing for detecting smoke and heat, a speaker provided within the housing for generating sound when the fire detection unit detects smoke or heat, and a plate-shaped partition member provided within the housing for dividing a first space which is a passage from the opening to the fire detection unit and a second space in which the speaker is provided, the partition member having an opening formed therein, and the housing being configured so that sound waves from the speaker radiated from the second space to the first space through the opening propagate toward the opening side, the housing having a flat opposing surface portion facing the partition member, and the portion of the opposing surface portion facing the fire detection unit is a closed surface with no holes formed therein, and the opposing surface portion faces the portion of the partition member where the opening is formed, and has a reflective surface that reflects sound waves and propagates them to the opening.

The detector of the present invention comprises a housing having a cylindrical side portion with an opening through which smoke flows , a fire detection unit provided within the housing for detecting smoke and heat, a speaker provided within the housing for generating sound when the fire detection unit detects smoke or heat, and a plate-shaped partition member provided within the housing for separating a first space which is a passageway from the opening to the fire detection unit from a second space in which the speaker is provided, the first space being provided above the second space, an opening being formed in the partition member, and the housing being configured so that sound waves from the speaker radiated from the opening into the first space propagate toward the opening side.

The detector according to the present invention has the above-mentioned configuration, so that the range in which a certain level of sound pressure can be maintained can be expanded.

1 is a diagram showing the external appearance of a smoke detector 100 according to an embodiment. FIG. 2 is an exploded perspective view of the components of the smoke detector 100. 1A shows a cross section of the first cover 11 taken along the line AA shown in FIG. 1B is a cross-sectional view taken along the line B-B of FIG. 5 shows the end faces of the base portion 3 and the lid portion 4 taken along the line DD shown in FIG. 1(a) is a cross-sectional view taken along the line CC shown in FIG. 1 shows a modified example (smoke detector 101) of the smoke detector 100 according to the embodiment.

Embodiment
Hereinafter, an embodiment of a sensor according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below. Also, in the following drawings including FIG. 1, the size relationship of each component may differ from the actual one.

Figure 1 is a diagram showing the external appearance of a smoke detector 100 according to an embodiment. Figure 1(a) is a side view showing the external appearance of the smoke detector 100, and Figure 1(b) is a bottom view showing the external appearance of the smoke detector 100. Figure 2 is a perspective view showing the components of the smoke detector 100 in an exploded state. Figure 3 shows a cross section of the first cover 11 taken along line A-A in Figure 1(a). Figure 4 is a cross section of the first cover 11 taken along line B-B in Figure 1(b). The configuration of the smoke detector 100 will be described with reference to Figures 1 to 4.

The smoke detector 100 is installed in a monitored space such as a room in a house. As shown in FIG. 1, the smoke detector 100 is attached to a ceiling 200, for example. As shown in FIGS. 1 and 2, the smoke detector 100 includes a housing 10 including a first cover 11 having a bottomed cylindrical shape and a second cover 12 that serves as a lid for the first cover 11. As shown in FIGS. 2 and 4, the smoke detector 100 includes a partition member 30 that is housed in the housing 10 and partitions the space in the housing 10 into upper and lower parts, and a fire detection unit Det provided in the partition member 30. The fire detection unit Det includes a darkroom section Drm having a light-shielding function, and a light-receiving unit and a light-emitting unit of a substrate 6 described later. The darkroom section Drm includes an optical bench cover 5 that is housed in the housing 10 and has a light-shielding function, a labyrinth wall Lb that is housed in the optical bench cover 5 and has a light-shielding function, and an optical bench 4A6 formed in a lid section 4 described later. As shown in Figures 2 and 4, the smoke detector 100 includes a board 6 housed in a partition member 30, a battery 7 that supplies operating power to various circuits provided on the board 6, and a speaker 8 that is housed in the partition member 30 and produces sound. As shown in Figure 2, the smoke detector 100 also includes a push-in member 20 that is provided on the first cover 11 and that is pushed by an inspector when inspecting the smoke detector 100.

1(a) and 2, the first cover 11 of the housing 10 has an opening 1 extending in the circumferential direction. A plate-shaped partition member 1a is provided in the opening 1 of the housing 10. The opening 1 has an upper opening 1A and a lower opening 1B. The upper opening 1A is provided on the upper side of the partition member 1a, and the lower opening 1B is provided on the lower side of the partition member 1a. The first cover 11 has a flat opposing surface portion 11A and a cylindrical side portion 11B. The opposing surface portion 11A has an opening 11A1 that is closed by a pushing member 20. As shown in FIG. 1 and FIG. 3, the opposing surface portion 11A has an outer surface Sf1 that is a design surface, and an inner surface Sf2 that is the back side of the outer surface Sf1 and faces the partition member 30. 2 and 3, the facing surface 11A has a circular recessed portion 11A2 in which the lid portion 5A of the optical bench cover 5 is disposed, and a support portion 11A3 in which the shaft portion 21 of the pushing member 20 is disposed. The facing surface 11A also has guide plates a1 to a4 that guide smoke that has flowed into the housing 10 from the opening 1 to the optical bench cover 5, and a cylindrical insertion portion b to which the screws inserted into each insertion portion 3B1 are fastened.

The concave portion 11A2 is recessed in a direction from the base portion 3 toward the opposing surface portion 11A so as to suppress interference with the optical bench cover 5. The side portion 11B includes a main rib 13 extending in the vertical direction, a sub-rib 14 provided between adjacent main ribs 13 and extending in the vertical direction, and a cylindrical portion 15 provided on the periphery of the partition member 30. The lower end of the main rib 13 is connected to the opposing surface portion 11A, and the upper end of the main rib 13 is connected to the cylindrical portion 15. The sub-rib 14 is thinner than the main rib 13. The lower end of the sub-rib 14 is connected to the opposing surface portion 11A, and the upper end of the sub-rib 14 is connected to the cylindrical portion 15. The central angle at the center O1 of a pair of adjacent main ribs 13 is 90 degrees. Here, the planar shape of the opposing surface portion 11A is circular, and the center O1 corresponds to the center of the opposing surface portion 11A. In addition, eight sub-ribs 14 are formed on the first cover 11. The central angle at the center O1 of a pair of adjacent sub-ribs 14 is 30 degrees. The tubular portion 15 is a member that surrounds the partition member 30 and can be configured, for example, in a cylindrical shape. The second cover 12 is provided on the top of the first cover 11.

The introduction plates a1 to a4 protrude from the opposing surface portion 11A side toward the partition member 30 side. The introduction plates a1 and a2 are arranged parallel to the longitudinal direction of the battery 7. The introduction plates a3 and a4 are arranged radially around the recessed portion 11A2. Here, as shown in FIG. 3, a virtual plane passing through the center O2 and center O1 of the recessed portion 11A2 is defined as a surface Pr. Also, one portion of the smoke detector 100 divided by the surface Pr is defined as region Rg1, and the other portion of the smoke detector 100 divided by the surface Pr is defined as region Rg2. The battery storage portion 3C and the battery 7 are provided on the surface Pr. The introduction plate a1, the speaker hole forming portion 4A1, the speaker 8, etc. are provided in the region Rg1. The introduction plates a2 and a3 are provided in the region Rg2. Nine introduction plates a4 are provided. Four introduction plates a4 are provided in region Rg1, four introduction plates a4 are provided in region Rg2, and one introduction plate a4 is provided on surface Pr.

An opening 11A1 is formed in the facing surface 11A, but the portion other than the opening 11A1 is blocked. The opening 11A1 is also blocked by a push-in member 20. As shown in Figs. 2 and 3, the facing surface 11A is formed with a reflecting surface Rf located below the speaker hole 4A8. The reflecting surface Rf is included in the inner surface Sf2. The reflecting surface Rf reflects sound waves from the speaker 8 and propagates the sound waves radially from the speaker hole 4A8 side to the opening 1 side. No holes are formed in the reflecting surface Rf. In other words, no speaker hole is formed in the first cover 11. This contributes to improving the aesthetic appearance of the design surface of the smoke detector 100. It also has the effect of preventing the insertion or intrusion of foreign objects.

2, the partition member 30 includes a base portion 3 having a wall portion 3A, and a cover portion 4 that covers the substrate 6 and the speaker 8. A smoke detection space 3A3 is formed inside the wall portion 3A of the base portion 3. The base portion 3 includes an annular edge portion 3B, a concave battery storage portion 3C that stores the battery 7, and a concave speaker storage portion 3D that stores the speaker 8. The base portion 3 also includes a substrate placement portion 3E in which the substrate 6 is provided, and a support portion 3F formed on the edge portion 3B and protruding to the opposing surface portion 11A. The substrate 6 is provided around the wall portion 3A. The edge portion 3B is provided along the inner peripheral surface of the cylindrical portion 15 of the first cover 11. The edge portion 3B has two insertion portions 3B1 into which screws (not shown) that fix the base portion 3 and the first cover 11 are inserted. The battery storage portion 3C includes a partition wall 3E1 that partitions the side where the battery 7 is arranged from the side where the substrate 6 is provided. A battery 7 is provided above the battery housing 3C. The speaker housing 3D is a wall that surrounds the speaker 8. The speaker housing 3D is formed in an arc shape. The base 3 also has a surface 3D1 that faces the top surface of the speaker 8. The board placement section 3E faces the edge of the board 6. The support section 3F rotatably supports the shaft 21 of the pressing member 20.

2, the lid 4 includes a lid body 4A, a flange 4B provided on the edge of the lid body 4A, and a columnar guide member 4C that guides smoke that has flowed into the housing 10 from the opening 1 to the optical base cover 5. The lid body 4A includes a plate-shaped speaker hole forming portion 4A1 in which a speaker hole 4A8 is formed, a wall portion 4A2 formed on the periphery of the speaker hole forming portion 4A1, a wall portion 4A3 described in FIG. 5 below, and an insertion portion 4A4 into which a screw (not shown) provided on one of the two insertion portions 3B1 is inserted. The lid body 4A also includes an LED hole 4A5 exposing an LED (not shown) on the board 6 that lights up when the switch 6A on the board 6 is pressed, an optical base 4A6 on which the optical base cover 5 is provided, a speaker hole 4A8 through which sound waves generated by the speaker 8 pass, and a switch hole 4A9 into which the switch 6A on the board 6 is inserted. As shown in FIG. 4, the optical bench 4A6 has a through hole 4A7 that connects the darkroom section Drm to the smoke detection space 3A3.

The optical bench cover 5 is a bowl-shaped member. The optical bench cover 5 is provided on the opposing surface portion 11A of the first cover 11 and comprises a lid-shaped portion 5A attached to the lid portion 4, and a cylindrical mesh portion 5B having a plurality of holes through which smoke can pass. The lid-shaped portion 5A and the mesh portion 5B have a light-blocking function similar to the labyrinth wall Lb. In addition, the mesh portion 5B prevents dust, insects, etc. from entering the darkroom portion Drm.

The substrate 6 is arranged parallel to the horizontal direction. As shown in FIG. 2, the substrate 6 is provided with a light-emitting section, which can be constituted by an LED or the like, and a light-receiving section that receives light from the light-emitting section. The substrate 6 is also provided with a shielding case 6B that protects the circuit of the light-receiving section. Furthermore, the substrate 6 is formed with an optical system arrangement section 6C, which is a cutout section formed to match the peripheral shape of the wall section 3A of the base section 3. The optical system arrangement section 6C is provided with the above-mentioned light-emitting section and light-receiving section.

As shown in FIG. 2, the speaker 8 is provided between the base 3 and the lid 4. Specifically, the speaker 8 is housed in the speaker housing 3D of the base 3, the surface 3D1 of the base 3, and the speaker hole forming portion 4A1 of the lid 4. A diaphragm is provided on the underside of the speaker 8.

As shown in Figures 2 and 3, the pushing member 20 has a rotatable shaft portion 21 sandwiched between the support portion 3F of the base portion 3 and the support portion 11A3 of the opposing surface portion 11A of the first cover 11, and a pushing surface portion 22 connected to the shaft portion 21 and closing the opening portion 11A1 of the first cover 11.

Figure 5 shows the D-D end faces of the base 3 and lid 4 shown in Figure 4. The configuration of the smoke detector 100 will be further described with reference to Figure 5. The wall 3A has a hole 3A1 through which the light-emitting part for smoke detection faces, a hole 3A2 through which the light-receiving part for smoke detection faces, and a protrusion 3A4 that constantly prevents light from the light-emitting part from entering the light-receiving part. A smoke detection space 3A3 is formed inside the wall 3A. The smoke detection space 3A3 is connected to the darkroom part Drm described above.

A wall portion 4A2 of the lid portion 4 is provided around the speaker housing portion 3D. In addition, a wall portion 4A3 of the lid portion 4 is provided around the wall portion 3A and around the board placement portion 3E. Although the wall portion 4A3 is hidden and not visible in FIG. 2 already described, it is formed on the back side of the formation surface of the optical bench 4A6.

As shown in FIG. 4, a first space SP1 is formed within the housing 10, which is a passage for smoke from the opening 1 to the optical table cover 5. Also, as shown in FIG. 2, a second space SP2 in which a speaker 8 is provided is formed within the housing 10. The second space SP2 is provided above the first space SP1. The first space SP1 and the second space SP2 are vertically separated by the speaker hole forming portion 4A1.

Figure 6 is a cross-sectional view taken along the line C-C shown in Figure 1(a). Next, the operation of the smoke detector 100 will be described with reference to Figure 6 and Figures 1 to 5 described above. When a fire or the like occurs, smoke flows into the first space SP1 through the opening 1 of the housing 10. The smoke that flows into the first space SP1 is guided to the optical bench cover 5 of the darkroom section Drm of the fire detection unit Det by the introduction plate a1 or the like. Then, the smoke that reaches the periphery of the optical bench cover 5 flows into the space inside the optical bench cover 5 (the darkroom section Drm of the fire detection unit Det) through the holes in the mesh section 5B. The smoke that flows into the space inside the optical bench cover 5 passes through the labyrinth wall Lb and then flows into the through hole 4A7 of the cover section 4. The smoke that flows into the through hole 4A7 flows into the smoke detection space 3A3. Note that fine particles are mixed in the smoke. These particles are heavier than smoke and therefore do not rise easily. As a result, the particles remain on the optical bench cover 5, and smoke flows into the smoke detection space 3A3. This improves the fire detection accuracy of the smoke detector 100. When smoke flows into the smoke detection space 3A3, the light from the light-emitting portion of the substrate 6 is scattered in the smoke detection space 3A3. The light-receiving portion of the substrate 6 detects this scattered light, and the smoke detector 100 detects a fire.

When the light receiving section of the substrate 6 detects the scattered light, the control circuit of the substrate 6 causes the speaker 8 to generate sound. When the speaker 8 generates sound, the diaphragm of the speaker 8 vibrates. When the diaphragm of the speaker 8 vibrates, the diaphragm of the speaker 8 generates sound waves, which are compressional waves. The sound waves generated by the speaker 8 propagate through the air and pass through the speaker hole 4A8. A part of the sound waves that pass through the speaker hole 4A8 are reflected by the reflecting surface Rf of the opposing surface portion 11A. As shown in FIG. 6, the sound waves Sw reflected by the reflecting surface Rf of the opposing surface portion 11A propagate radially from the speaker hole 4A8 side to the opening 1 side. The other part of the sound waves that pass through the speaker hole 4A8 are diffracted by the speaker hole 4A8 and then propagate, for example, directly to the opening 1, or propagate to the opening 1 while being reflected by the partition member 30 or the opposing surface portion 11A.

The sound waves Sw that reach the opening 1 spread radially from the smoke detector 100. The sound waves Sw that reach the opening 1 are diffracted at the opening 1 and also propagate below the smoke detector 100. The sound waves generated on the upper surface of the diaphragm of the speaker 8 are in opposite phase to the sound waves generated on the lower surface of the diaphragm of the speaker 8, but the sound waves generated on the upper surface of the diaphragm of the speaker 8 are attenuated by vibrating the surface portion 3D1, etc. Therefore, the sound waves generated on the upper surface of the diaphragm of the speaker 8 are prevented from attenuating the sound waves generated on the lower surface of the diaphragm of the speaker 8.

Next, the effects of the embodiment will be described. The housing 10 of the smoke detector 100 is configured so that the sound waves Sw radiated from the speaker hole 4A8 into the first space SP1 propagate from the speaker hole 4A8 side to the opening 1 side. In other words, the sound waves Sw that pass through the speaker hole 4A8 are reflected by the housing 10, and the reflected sound waves Sw propagate radially from the speaker hole 4A8 side to the opening 1 side, and the sound waves Sw that reach the opening 1 spread radially with the smoke detector 100 as the center. Therefore, the smoke detector 100 can expand the range in which a certain level of sound pressure can be secured when the speaker 8 generates sound.

In addition, as explained in the operation of the smoke detector 100, the sound waves generated on the underside of the diaphragm of the speaker 8 are prevented from being attenuated by the sound waves generated on the upper side of the diaphragm of the speaker 8. Therefore, the smoke detector 100 can further expand the range in which a certain level of sound pressure can be secured when the speaker 8 generates sound.

The opposing surface portion 11A of the smoke detector 100 faces the portion of the partition member 30 where the speaker hole 4A8 is formed, and has a reflecting surface Rf that reflects sound waves Sw radiated from the speaker hole 4A8 into the first space SP1 and propagates the sound waves Sw toward the opening 1. The reflecting surface Rf is a closed surface with no holes formed therein so that the sound waves Sw can be effectively reflected. In other words, the reflecting surface Rf can more reliably reflect the sound waves propagating from the speaker hole 4A8 and more reliably propagate them toward the opening 1.

Since the facing surface portion 11A of the smoke detector 100 is a flat plate-shaped member, the outer surface Sf1 of the facing surface portion 11A, i.e., the design surface, is a flat surface. In this way, since the design surface of the facing surface portion 11A of the smoke detector 100 is a flat surface, the smoke detector 100 has an excellent aesthetic appearance. Furthermore, since the facing surface portion 11A of the smoke detector 100 is a flat plate-shaped member, the sound waves Sw radiated from the speaker hole 4A8 to the first space SP1 are reflected by the facing surface portion 11A and reach the opening 1 more reliably. Therefore, the smoke detector 100 easily spreads the sound waves radially from the smoke detector 100 as the center, and the smoke detector 100 has a greater effect of expanding the range in which a certain level of sound pressure can be secured when the speaker 8 generates sound.

In addition, an opening 11A1 is formed on the facing surface 11A of the smoke detector 100, but it is blocked by the pushing member 20. Therefore, there is no open portion on the facing surface 11A of the smoke detector 100. Therefore, even if the smoke detector 100 is provided with the opening 11A1 and the pushing member 20, etc., to make it easier to inspect the smoke detector 100, the smoke detector 100 still has the above-mentioned effects of excellent aesthetics and the effect of expanding the range in which a certain level of sound pressure can be maintained.

Figure 7 shows a modified example (smoke detector 101) of the smoke detector 100 according to the embodiment. In the modified example, the vertical relationship between the first space SP1 and the second space SP2 is reversed from that in the embodiment. In other words, the first space SP1 is provided above the second space SP2. The configuration of the smoke detector 101 according to the modified example will be explained.

The smoke detector 101 comprises a housing 71, a partition member 74 that separates the first space SP1 and the second space SP2, an optical base cover 75 provided on the partition member 74, a board 76 provided below the partition member 74, and a speaker 78 provided below the partition member 74. The housing 71 houses the partition member 74, the optical base cover 75, the board 76, and the speaker 78. The housing 71 comprises a cylindrical side portion 71b in which an opening 71A is formed, an opposing surface portion 71a provided on the upper side of the partition member 30, and a design surface 71c which is a flat surface. A reflective surface Rf is formed on the lower surface of the opposing surface portion 71a.

The partition member 74 includes a flat speaker hole forming portion 74A and an optical base 74C on which an optical base cover 75 is provided. A speaker hole 74B is formed in the speaker hole forming portion 74A. The optical base cover 75 includes a lid-shaped portion 75A facing the opposing surface portion 71a and a cylindrical mesh portion 75B in which a plurality of holes through which smoke passes are formed. The optical base cover 75 also includes a labyrinth wall 75C having a light-shielding function. The optical base cover 75, the labyrinth wall 75C, and the optical base 74C form the darkroom portion Drm. The board 76 includes a light-emitting portion 76A composed of an LED or the like and a light-receiving portion 76B composed of a light-receiving element or the like. Two holes are formed in the partition member 74, and the light-emitting portion 76A and the light-receiving portion 76B face the darkroom portion Drm through the two holes. The speaker 78 is provided directly below the speaker hole forming portion 74A.

Although not shown in FIG. 7, the smoke detector 101 also includes a battery. In a modified example, the partition member 74 may have a configuration corresponding to the battery storage section 3C of the partition member 30. Also, in a modified example, the battery can be disposed in the second space SP2.

The smoke detector 101 according to the modified example has the same effect as the smoke detector 100 according to the embodiment. In the above, the detector is a smoke detector, but the present invention is not limited to this. The configurations of the embodiment and modified example can also be applied to a heat detector. A heat detector is a detector that detects the occurrence of a fire by the heat generated when a fire occurs. For example, in the case of a differential heat detector, the fire detection unit corresponds to a configuration such as a thermistor, and in the case of a constant temperature heat detector, the fire detection unit corresponds to a configuration such as a bimetal.

In the embodiment, an example is described in which the first space SP1 and the second space SP2 are vertically separated by a partition member 30, and in the modified example, an example is described in which the first space SP1 and the second space SP2 are vertically separated by a partition member 74. In other words, in the embodiment and modified example, an example is described in which the first space SP1 and the second space SP2 are vertically separated, but this is not limited to a vertically separated form. A sensor that is not vertically separated, for example, a sensor that is horizontally or diagonally separated by a partition member, may also be used, and even a sensor in which one space is divided into two or more spaces can provide the same effects as those in the embodiment and modified example.

1 opening, 1A upper opening, 1B lower opening, 1a partition member, 3 base portion, 3A wall portion, 3A1 hole portion, 3A2 hole portion, 3A3 smoke detection space, 3A4 protrusion portion, 3B edge portion, 3B1 insertion portion, 3C battery storage portion, 3D speaker storage portion, 3D1 surface portion, 3E board arrangement portion, 3E1 partition wall, 3F support portion, 4 lid portion, 4A lid main body, 4A1 speaker hole forming portion, 4A2 wall portion, 4A3 wall portion, 4A4 insertion portion, 4A6 optical base, 4A7 through hole, 4A8 speaker hole, 4A9 switch hole, 4B flange portion, 4C introduction member, 4D5 LED hole, 5 optical base cover, 5A lid-shaped portion, 5B mesh portion, 6 board, 6A switch, 6B shield case, 6C Optical system arrangement section, 7 Battery, 8 Speaker, 10 Housing, 11 First cover, 11A Opposing surface section, 11A1 Opening, 11A2 Concave section, 11A3 Support section, 11B Side section, 12 Second cover, 13 Main rib, 14 Sub-rib, 15 Cylindrical section, 20 Push-in member, 21 Shaft section, 22 Push-in surface section, 30 Partition member, 71 Housing, 71A Opening, 71a Opposing surface section, 71b Side section, 71c Design surface, 74 Partition member, 74A Speaker hole forming section, 74B Speaker hole, 74C Optical base, 75 Optical base cover, 75A Lid section, 75B Mesh section, 75C Labyrinth wall, 76 Substrate, 76A Light emitting section, 76B Light receiving section, 78 Speaker, 100 Smoke detector, 101 Smoke detector, 200 ceiling, Det fire detection section, Drm darkroom section, Lb labyrinth wall, O1 center, O2 center, Pr surface, Rf reflecting surface, Rg1 area, Rg2 area, SP1 first space, SP2 second space, Sf1 outer surface, Sf2 inner surface, Sw sound wave, a1 introduction plate, a2 introduction plate, a3 introduction plate, a4 introduction plate, b insertion section.

Claims (3)

A housing having a cylindrical side portion with an opening through which smoke flows in ;
a fire detection unit provided in the housing and configured to detect smoke and heat;
a speaker provided in the housing and configured to generate a sound when the fire detection unit detects smoke or heat;
a plate-shaped partition member disposed within the housing, partitioning a first space that is a passage from the opening to the fire detection unit and a second space in which the speaker is disposed;
Equipped with
The partition member has an opening formed therein ,
the housing is configured such that sound waves from the speaker radiated from the second space to the first space through the opening propagate toward the opening side,
The housing has a flat-plate-shaped opposing surface portion facing the partition member,
The portion of the facing surface facing the fire detection unit is a closed surface having no holes formed therein,
The opposing surface portion faces a portion of the partition member where the opening is formed, and has a reflecting surface that reflects the sound waves and propagates the sound waves toward the opening. A housing having a cylindrical side portion with an opening through which smoke flows in ;
a fire detection unit provided in the housing and configured to detect smoke and heat;
a speaker provided in the housing and configured to generate a sound when the fire detection unit detects smoke or heat;
a plate-shaped partition member disposed within the housing, partitioning a first space that is a passage from the opening to the fire detection unit and a second space in which the speaker is disposed;
Equipped with
The first space is provided above the second space,
The partition member has an opening formed therein ,
The sensor, wherein the housing is configured so that sound waves from the speaker radiated from the opening into the first space propagate toward the opening side. The housing has a flat-plate-shaped opposing surface portion facing the partition member,
The sensor according to claim 2, characterized in that the opposing surface portion faces a portion of the partition member in which the opening is formed, and has a reflective surface that reflects the sound waves radiated into the first space and propagates the sound waves to the opening.

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