Sensor

Abstract

To provide a sensor capable of expanding a range where a sound pressure can be secured to a fixed value or more.SOLUTION: The detector includes a housing having a tubular side surface part in which an opening part through which smoke flows in is formed, a fire detecting part provided in the housing and configured to detect smoke or heat, a speaker provided in the housing and configured to generate a sound in response to detection of smoke or heat by the fire detecting part, and a first space that is a passage from the opening part to the fire detecting part and a second space in which the speaker is provided. And a plate-shaped partition member provided in the housing, in which an opening is formed in the partition member, the housing is configured such that a sound wave of the speaker emitted from the second space to the first space through the opening propagates toward the opening, the housing has a flat plate-shaped facing surface portion facing the partition member, and the facing surface portion has a reflecting surface that faces a portion of the partition member where the opening is formed and reflects the sound wave to propagate the sound wave to the opening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] 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. [Background technology]

[0002] A conventional smoke detector has been proposed that includes 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 cylindrical member with a bottom and a peripheral wall. An air window is formed in the peripheral wall of the head cover to allow smoke to pass through, and a sound hole is formed in the bottom of the head cover to allow sound waves generated by the speaker to pass through. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-352932 (for example, paragraphs 0066-0069 and FIG. 7) Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, sound waves generated 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, while sound waves generated by vibrations of the upper surface (rear 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 generated by vibrations of the lower surface of the speaker and the sound waves generated by vibrations of the upper surface of the speaker are out of phase with each other. Therefore, 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, the range in which a certain level of sound pressure can be maintained is narrowed.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a sensor that can expand the range in which a certain level of sound pressure can be ensured. [Means for solving the problem]

[0006] The detector of the present invention comprises a housing having a cylindrical side portion with an opening through which smoke flows in, a fire detection unit provided within the housing for detecting smoke and heat, a speaker provided within the housing for emitting sound when the fire detection unit detects smoke or heat, and a plate-shaped partition member provided within the housing that separates 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 partition member having an opening formed in it, 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, the housing having a flat opposing surface portion facing the partition member, the opposing surface portion facing the part of the partition member where the opening is formed, and having a reflective surface that reflects sound waves and propagates them toward the opening. [Effects of the Invention]

[0007] According to the sensor of the present invention, since it has the above-mentioned configuration, it is possible to expand the range in which a certain level of sound pressure or more can be ensured. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the appearance of a smoke detector 100 according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the components of the smoke detector 100. [Figure 3] 1(a) shows a cross section of the first cover 11 taken along the line AA shown in FIG. [Figure 4] FIG. 1B is a cross-sectional view taken along the line BB shown in FIG. [Figure 5] 5 shows the DD end faces of the base part 3 and the lid part 4 shown in FIG. [Figure 6]FIG. 1(b) is a cross-sectional view taken along the line CC shown in FIG. [Figure 7] 1 shows a modified example (smoke sensor 101) of the smoke sensor 100 according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment Hereinafter, embodiments 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 embodiments described below. Also, the size relationships between the components in the following drawings, including FIG. 1, may differ from the actual size relationships.

[0010] FIG. 1 is a diagram showing the appearance of a smoke sensor 100 according to an embodiment. FIG. 1(a) is a side view showing the appearance of the smoke sensor 100, and FIG. 1(b) is a bottom view showing the appearance of the smoke sensor 100. FIG. 2 is a perspective view showing the components of the smoke sensor 100 in an exploded state. FIG. 3 shows a cross section of the first cover 11 taken along line AA shown in FIG. 1(a). FIG. 4 is a cross section of the first cover 11 taken along line BB shown in FIG. 1(b). The configuration of the smoke sensor 100 will be described with reference to FIGS. 1 to 4.

[0011] The smoke detector 100 is installed in a monitored space, such as the interior of 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 cylindrical first cover 11 with a bottom 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 housed in the housing 10 and dividing the space within the housing 10 into upper and lower sections, 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-blocking function and a light-receiving unit and a light-emitting unit on a substrate 6, which will be described later. The darkroom section Drm includes an optical bench cover 5 housed in the housing 10 and having a light-blocking function, a labyrinth wall Lb housed in the optical bench cover 5 and having a light-blocking function, and an optical bench 4A6 formed on a lid section 4, which will be described later. 2 and 4, the smoke detector 100 includes a circuit board 6 housed in a partition member 30, a battery 7 that supplies operating power to various circuits provided on the circuit board 6, and a speaker 8 that is housed in the partition member 30 and produces sound. Furthermore, as shown in FIG. 2, the smoke detector 100 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.

[0012] As shown in FIGS. 1(a) and 2, an opening 1 extending in the circumferential direction is formed in a first cover 11 of the housing 10. 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 above the partition member 1a, and the lower opening 1B is provided below the partition member 1a. The first cover 11 has a flat opposing surface portion 11A and a cylindrical side surface portion 11B. The opposing surface portion 11A has an opening 11A1 that is closed by a push-in member 20. As shown in FIGS. 1 and 3, the opposing surface portion 11A has an outer surface Sf1 that serves as a design surface and an inner surface Sf2 that is the back surface 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-shaped 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.

[0013] The recessed portion 11A2 is recessed from the base portion 3 toward the opposing surface portion 11A to suppress interference with the optical bench cover 5. The side surface portion 11B includes main ribs 13 extending vertically, sub-ribs 14 extending vertically between adjacent main ribs 13, and a cylindrical portion 15 provided on the periphery of the partition member 30. The lower ends of the main ribs 13 are connected to the opposing surface portion 11A, and the upper ends of the main ribs 13 are connected to the cylindrical portion 15. The sub-ribs 14 are thinner than the main ribs 13. The lower ends of the sub-ribs 14 are connected to the opposing surface portion 11A, and the upper ends of the sub-ribs 14 are connected to the cylindrical portion 15. A central angle at the center O1 of a pair of adjacent main ribs 13 is 90 degrees. Here, the opposing surface portion 11A has a circular shape in a plan view, and the center O1 corresponds to the center of the opposing surface portion 11A. Eight sub-ribs 14 are formed on the first cover 11. The central angle between a pair of adjacent sub-ribs 14 at the center O1 is 30 degrees. The tubular portion 15 is a member that surrounds the partition member 30 and can be configured in a cylindrical shape, for example. The second cover 12 is provided on top of the first cover 11.

[0014] The introduction plates a1 to a4 protrude from the opposing surface portion 11A toward the partition member 30. 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, an imaginary plane passing through the centers O2 and O1 of the recessed portion 11A2 is defined as a surface Pr. One portion of the smoke detector 100 divided by the surface Pr is defined as an area Rg1, and the other portion of the smoke detector 100 divided by the surface Pr is defined as an area Rg2. The battery accommodating 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 area Rg1. The introduction plates a2 and a3 are provided in the area Rg2. Nine introduction plates a4 are provided. Four introduction plates a4 are provided in the region Rg1, four introduction plates a4 are provided in the region Rg2, and one introduction plate a4 is provided on the surface Pr.

[0015] An opening 11A1 is formed in the facing surface portion 11A, but the portion other than the opening 11A1 is closed. The opening 11A1 is also closed by a push-in member 20. As shown in FIGS. 2 and 3, the facing surface portion 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.

[0016] As shown in FIG. 2, the partition member 30 includes a base portion 3 having a wall portion 3A and a lid portion 4 that covers the circuit board 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 recessed battery housing portion 3C that houses a battery 7, and a recessed speaker housing portion 3D that houses a speaker 8. The base portion 3 also includes a circuit board placement portion 3E on which the circuit board 6 is provided, and a support portion 3F formed on the edge portion 3B and protruding toward the opposing surface portion 11A. The circuit board 6 is provided around the periphery of the wall portion 3A. The edge portion 3B is provided along the inner circumferential surface of the cylindrical portion 15 of the first cover 11. The edge portion 3B is formed with two insertion portions 3B1 into which screws (not shown) are inserted to fasten the base portion 3 and the first cover 11. The battery accommodating section 3C has a partition wall 3E1 that separates the side where the battery 7 is placed from the side where the board 6 is provided. The battery 7 is provided on the upper side of the battery accommodating section 3C. The speaker accommodating section 3D is a wall that surrounds the speaker 8. The speaker accommodating section 3D is formed in an arc shape. The base section 3 also has a surface section 3D1 that faces the upper 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 section 21 of the pushing member 20.

[0017] As shown in FIG. 2, the lid 4 includes a lid main body 4A, a flange 4B provided on the edge of the lid main 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 main 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 main body 4A also includes an LED hole 4A5 that exposes 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 is formed with a through-hole 4A7 that connects the darkroom portion Drm and the smoke detection space 3A3.

[0018] The optical bench cover 5 is a bowl-shaped member. The optical bench cover 5 is provided on the opposing surface 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 with multiple 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. The mesh portion 5B also prevents dust, insects, etc. from entering the darkroom portion Drm.

[0019] 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 that can be configured with 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 formed to match the peripheral shape of the wall section 3A of the base section 3. The above-mentioned light-emitting section and light-receiving section are provided in the optical system arrangement section 6C.

[0020] 2, the speaker 8 is provided between the base 3 and the lid 4. Specifically, the speaker 8 is housed within 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.

[0021] As shown in Figures 2 and 3, the pushing member 20 comprises 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 blocking the opening 11A1 of the first cover 11.

[0022] Figure 5 shows the double-ended end faces of the base 3 and the lid 4 shown in Figure 4. The configuration of the smoke detector 100 will be described again with reference to Figure 5. The wall 3A has a hole 3A1 through which the light-emitting element for smoke detection faces, a hole 3A2 through which the light-receiving element for smoke detection faces, and a protrusion 3A4 that constantly prevents light from the light-emitting element from entering the light-receiving element. A smoke detection space 3A3 is formed inside the wall 3A. The smoke detection space 3A3 is in communication with the darkroom Drm described above.

[0023] A wall 4A2 of the lid 4 is provided around the speaker housing portion 3D. Furthermore, a wall 4A3 of the lid 4 is provided around the wall 3A and around the board placement portion 3E. Although the wall 4A3 is hidden and not visible in Figure 2 already described, it is formed on the back side of the surface on which the optical bench 4A6 is formed.

[0024] As shown in Fig. 4, a first space SP1 is formed within the housing 10 as a passage for smoke from the opening 1 to the optical bench 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 separated vertically by a speaker hole forming portion 4A1.

[0025] FIG. 6 is a cross-sectional view taken along CC in FIG. 1(a). Next, the operation of the smoke detector 100 will be described with reference to FIG. 6 and the above-mentioned FIGS. 1 to 5. 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 by the guide plate a1 or the like to the optical bench cover 5 of the darkroom section Drm of the fire detection unit Det. 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 in the lid section 4. The smoke that flows into the through-hole 4A7 flows into the smoke detection space 3A3. Note that the smoke contains fine particles. These particles are heavier than smoke and therefore do not rise easily. As a result, these 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.

[0026] When the light receiving portion of the substrate 6 detects this 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. As 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 portion 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 portion 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.

[0027] The sound waves Sw that reach the opening 1 spread radially from the smoke detector 100 as the center. The sound waves Sw that reach the opening 1 are diffracted at the opening 1 and also propagate downward from the smoke detector 100. Furthermore, 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.

[0028] Next, the effects of the embodiment will be described. Housing 10 of smoke sensor 100 is configured so that sound waves Sw emitted from speaker hole 4A8 into first space SP1 propagate from speaker hole 4A8 toward opening 1. That is, sound waves Sw that pass through speaker hole 4A8 are reflected by housing 10, and the reflected sound waves Sw propagate radially from speaker hole 4A8 toward opening 1, and sound waves Sw that reach opening 1 spread radially with smoke sensor 100 as the center. Therefore, smoke sensor 100 can expand the range in which a certain level of sound pressure can be maintained when speaker 8 generates sound.

[0029] Furthermore, as explained in the operation of smoke detector 100, sound waves generated on the lower surface of the diaphragm of speaker 8 are prevented from being attenuated by sound waves generated on the upper surface of the diaphragm of speaker 8. Therefore, smoke detector 100 can further expand the range in which a certain level of sound pressure can be maintained when speaker 8 generates sound.

[0030] 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 emitted 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.

[0031] Because the facing surface portion 11A of the smoke sensor 100 is a flat member, the outer surface Sf1, i.e., the design surface, of the facing surface portion 11A is a flat surface. In this way, because the design surface of the facing surface portion 11A of the smoke sensor 100 is a flat surface, the smoke sensor 100 has an excellent aesthetic appearance. Furthermore, because the facing surface portion 11A of the smoke sensor 100 is a flat member, the sound waves Sw emitted from the speaker hole 4A8 into the first space SP1 are reflected by the facing surface portion 11A and more reliably reach the opening 1. Therefore, the smoke sensor 100 easily spreads the sound waves radially from the smoke sensor 100 as the center, and the smoke sensor 100 has a greater effect in expanding the range in which a certain level of sound pressure can be maintained when the speaker 8 generates sound.

[0032] Furthermore, although an opening 11A1 is formed in the facing surface 11A of the smoke detector 100, it is blocked by the pushing member 20. Therefore, there is no open portion in the facing surface 11A of the smoke detector 100. Therefore, even though the smoke detector 100 is provided with the opening 11A1 and the pushing member 20, etc., to facilitate inspection of 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.

[0033] 7 shows a modified example (smoke sensor 101) of the smoke sensor 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 sensor 101 according to the modified example will be described.

[0034] The smoke detector 101 includes 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 includes 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 reflecting surface Rf is formed on the underside of the opposing surface portion 71a.

[0035] The partitioning member 74 includes a flat speaker hole forming portion 74A and an optical bench 74C on which an optical bench cover 75 is provided. A speaker hole 74B is formed in the speaker hole forming portion 74A. The optical bench cover 75 includes a lid-shaped portion 75A facing the opposing surface portion 71a and a cylindrical mesh portion 75B with multiple holes through which smoke passes. The optical bench cover 75 also includes a labyrinth wall 75C with a light-blocking function. The optical bench cover 75, labyrinth wall 75C, and optical bench 74C form the darkroom portion Drm. The board 76 includes a light-emitting portion 76A formed by an LED or the like and a light-receiving portion 76B formed by a light-receiving element or the like. Two holes are formed in the partitioning member 74, and the light-emitting portion 76A and the light-receiving portion 76B face the darkroom portion Drm through the two holes. A speaker 78 is provided directly below the speaker hole forming portion 74A.

[0036] 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 accommodating section 3C of the partition member 30. Also, in a modified example, the battery can be disposed in the second space SP2.

[0037] The smoke detector 101 according to the modified example has the same effect as the smoke detector 100 according to the embodiment. Although the above description has been given using the case where the detector is a smoke detector as an example, 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.

[0038] In the embodiment, an example is described in which the first space SP1 and the second space SP2 are separated vertically by the partition member 30, and in the modified example, an example is described in which the first space SP1 and the second space SP2 are separated vertically by the partition member 74. That is, in the embodiment and modified example, an example is described in which the first space SP1 and the second space SP2 are separated vertically, but this is not limited to a vertical separation. A sensor that is not separated vertically, for example, a sensor that is separated horizontally or diagonally by a partition member, can 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. [Explanation of symbols]

[0039] 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 pushing member, 21 shaft section, 22 pushing 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-shaped 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 dark room 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

[Claim 1] a housing having a cylindrical side portion with an opening through which smoke flows; a fire detection unit provided in the housing and configured to detect smoke and heat; a speaker provided in the housing, which generates a sound when the fire detection unit detects smoke or heat; a plate-shaped partition member disposed within the housing, the partition member separating 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 An opening is formed in the partition member, the housing is configured so that sound waves from the speaker radiated from the second space to the first space through the opening propagate toward the opening, the housing has a flat-plate-shaped opposing surface portion facing the partition member, The opposing surface portion faces the 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 sensor characterized by:

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