JP2022116290A - sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor capable of expanding a range in which sound pressure can be ensured at a certain level or more.

SOLUTION: A smoke sensor 100 comprises: a cylindrical housing in which an opening 1 is formed in a side surface 11B; a fire detector Det that detects smoke or heat; a speaker 8 that generates sound by detecting smoke or heat; and a partition member 30 that partitions a first space which is a passage from the opening to the fire detector, and a second space in which the speaker is provided. A speaker hole 4A8 is formed in the partition member at a position where a speaker is provided, and a sound wave emitted from the speaker hole to the first space propagate from the speaker hole side to the opening side. The housing has a flat facing surface 11A that faces the partition member with the first space between them. A portion of the facing surface facing the fire detector is a closed surface, and the facing surface faces a portion of the partition member in which the speaker hole is formed, and reflects the sound wave emitted from the speaker hole to the first space to propagate the sound wave to the opening.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a fire sensor (hereinafter referred to as a sensor) such as a heat sensor and a smoke sensor for sensing heat and smoke during a fire, and more particularly to a sensor provided with a speaker.

A conventional sensor has been proposed that includes a head cover provided at the bottom of a housing and a speaker housed in the head cover (see Patent Document 1, for example). The head cover of the smoke sensor of Patent Document 1 is a bottomed cylindrical member having a bottom surface and a peripheral wall. The peripheral wall of the head cover is formed with an air window through which smoke passes, and the bottom surface of the head cover is formed with sound holes through which sound waves generated by the speaker pass.

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

In Patent Document 1, sound waves generated by vibrations of the lower surface (front surface) of the speaker pass through sound holes in the bottom surface of the head cover and are propagated to the living space, and sound waves generated by vibration of the upper surface (back surface) of the speaker are transmitted through air windows in the peripheral wall of the head cover. is propagated to the living space through the Here, the sound wave caused by the vibration of the lower surface of the speaker and the sound wave caused by the vibration of the upper surface of the speaker are opposite in phase. For this reason, the sound waves that have passed through the air windows in the peripheral wall of the head cover and propagated to the living space are attenuated by the sound waves that have passed through the sound holes in the bottom surface of the head cover and propagated to the living space. Therefore, when the speaker of the smoke sensor of Patent Document 1 generates sound, there is a problem that the range in which a certain level or more of sound pressure can be secured is narrowed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sensor capable of expanding the range in which a certain level or more of sound pressure can be secured.

The sensor according to the present invention includes a housing having a cylindrical side surface with an opening formed therein, a fire detection unit provided in the housing for detecting smoke and heat, and a fire detection unit provided in the housing. It separates a speaker that generates sound when smoke or heat is detected by the fire detection unit, a first space that is a passage from the opening to the fire detection unit, and a second space that is provided with the speaker. and a partitioning member provided within the housing, the partitioning member having a speaker hole formed at a position where the speaker is provided, and the housing configured to receive sound waves radiated from the speaker hole into the first space. is configured to propagate from the speaker hole side to the opening side. The facing portion is a closed surface with no hole formed therein, and the facing surface portion faces a portion of the partition member where the speaker hole is formed, and blocks sound waves radiated from the speaker hole into the first space. It has a reflecting surface that reflects and propagates sound waves to the opening.

The sensor according to the present invention includes a housing having a cylindrical side surface portion in which an opening is formed, a fire detection unit provided in the housing for detecting smoke and heat, and a fire detection unit provided in the housing. It separates a speaker that generates sound when smoke or heat is detected by the fire detection unit, a first space that is a passage from the opening to the fire detection unit, and a second space that is provided with the speaker. and a partitioning member provided in the housing, wherein the first space is provided above the second space, and the partitioning member has a speaker hole formed at a position where the speaker is provided. The housing is configured such that sound waves radiated from the speaker hole to the first space are propagated from the speaker hole side to the opening side.

According to the sensor of the present invention, since it has the above configuration, it is possible to expand the range in which a certain level or more of sound pressure can be secured.

It is a figure which shows the external appearance of the smoke sensor 100 which concerns on embodiment. FIG. 2 is a perspective view of the components of the smoke sensor 100 in an exploded state; 1A shows a cross section of the first cover 11 taken along the line AA shown in FIG. 1(a). It is a BB sectional view shown in FIG.1(b). The DD end face shown in FIG. 4 of the base part 3 and the lid part 4 is shown. It is a CC cross-sectional view shown in FIG. 1(a). A modification (smoke sensor 101) of the smoke sensor 100 according to the embodiment is shown.

Embodiment.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a sensor according to the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by the embodiments described below. In addition, in the following drawings including FIG. 1, the size relationship of each component may differ from the actual one.

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. FIG. 2 is an exploded perspective view of each component of the smoke sensor 100. FIG. FIG. 3 shows the AA section of the first cover 11 shown in FIG. 1(a). FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. 1(b). The configuration of the smoke sensor 100 will be described with reference to FIGS. 1 to 4. FIG.

The smoke sensor 100 is installed, for example, in a monitored space such as a room of a house. As shown in FIG. 1, the smoke detector 100 is attached to the ceiling 200, for example. As shown in FIGS. 1 and 2, the smoke sensor 100 includes a housing 10 including a bottomed cylindrical first cover 11 and a second cover 12 serving as a lid for the first cover 11. I have. Further, as shown in FIGS. 2 and 4, the smoke sensor 100 is housed in the housing 10, and includes a dividing member 30 that vertically divides the space inside the housing 10, and a fire sensor provided in the dividing member 30. and a detection unit Det. The fire detection section Det includes a darkroom section Drm having a light shielding function, and a light receiving section and a light emitting section of the substrate 6 which will be described later. The darkroom portion Drm is housed in the housing 10 and is formed by an optical bench cover 5 having a light shielding function, a labyrinth wall Lb housed in the optical bench cover 5 and having a light shielding function, and a lid portion 4 to be described later. and an optical bench 4A6. As shown in FIGS. 2 and 4, the smoke sensor 100 includes a substrate 6 housed in a partition member 30, a battery 7 for supplying operating power to various circuits provided on the substrate 6, and a partition. A speaker 8 is housed in the member 30 and produces sound. Furthermore, as shown in FIG. 2 , the smoke sensor 100 is provided with the first cover 11 and has a pushing member 20 that is pushed by an inspector when inspecting the smoke sensor 100 .

As shown in FIGS. 1A and 2, the first cover 11 of the housing 10 is formed with an opening 1 extending in the circumferential direction. A plate-shaped partition member 1 a is provided in the opening 1 of the housing 10 . The opening 1 has an upper opening 1A and a lower opening 1B. An upper opening 1A is provided on the upper side of the partition member 1a, and a lower opening 1B is provided on the lower side of the partition member 1a. The first cover 11 includes a flat facing surface portion 11A and a cylindrical side surface portion 11B. An opening 11A1 closed by the pushing member 20 is formed in the facing surface 11A. As shown in FIGS. 1 and 3, the facing surface portion 11A is formed with an outer surface Sf1, which is a design surface, and an inner surface Sf2, which is the back surface of the outer surface Sf1 and faces the partition member 30. As shown in FIGS. 2 and 3, the facing surface portion 11A includes a circular concave portion 11A2 in which the lid-shaped portion 5A of the optical bench cover 5 is arranged, and a support portion in which the shaft portion 21 of the pushing member 20 is arranged. 11A3. The facing surface portion 11A has a cylindrical shape to which introduction plates a1 to a4 that guide the smoke flowing into the housing 10 from the opening 1 to the optical bench cover 5 and screws inserted into the respective insertion portions 3B1 are fastened. and an insertion portion b.

The recessed portion 11A2 is recessed in the direction from the base portion 3 toward the facing surface portion 11A so as to suppress interference with the optical bench cover 5. As shown in FIG. The side surface portion 11</b>B includes a vertically extending main rib 13 , vertically extending sub-ribs 14 provided between adjacent main ribs 13 , and a cylindrical portion 15 provided on the peripheral edge of the partition member 30 . . The lower end of the main rib 13 is connected to the facing surface portion 11A, and the upper end of the main rib 13 is connected to the cylindrical portion 15. As shown in FIG. The sub-ribs 14 are thinner than the main ribs 13. A lower end of the sub-rib 14 is connected to the facing surface portion 11A, and an upper end of the sub-rib 14 is connected to the cylindrical portion 15. As shown in FIG. A central angle at the center O1 of a pair of adjacent main ribs 13 is 90 degrees. Here, the planar view shape of the facing surface portion 11A is circular, and the center O1 corresponds to the center of the facing surface portion 11A. Eight sub-ribs 14 are formed on the first cover 11 . A central angle at the center O1 of a pair of adjacent sub-ribs 14 is 30 degrees. The tubular portion 15 is a member surrounding the partition member 30, and can be configured, for example, in a cylindrical shape. The second cover 12 is provided above the first cover 11 .

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

An opening 11A1 is formed in the facing surface portion 11A, but portions other than the opening 11A1 are closed. The opening 11A1 is also closed by the pushing member 20. As shown in FIG. As shown in FIGS. 2 and 3, the opposing surface portion 11A is formed with a reflecting surface Rf positioned below the speaker hole 4A8. Reflecting surface Rf is included in inner surface Sf2. The reflecting surface Rf reflects the sound wave of the speaker 8 and propagates the sound wave radially from the speaker hole 4A8 side to the opening 1 side. No holes are formed in the reflecting surface Rf. In other words, the speaker hole is not formed in the first cover 11 . This contributes to improving the aesthetic appearance of the design surface of the smoke sensor 100 . It also has the effect of preventing the insertion and intrusion of foreign matter.

As shown in FIG. 2, the partition member 30 includes a base portion 3 having a wall portion 3A and a lid portion 4 covering the substrate 6 and the speaker 8. As shown in FIG. Inside the wall portion 3A of the base portion 3, a smoke detection space 3A3 is formed. The base portion 3 includes a ring-shaped edge portion 3B, a recessed battery housing portion 3C housing the battery 7, and a recessed speaker housing portion 3D housing the speaker 8. The base portion 3 also includes a substrate placement portion 3E on which the substrate 6 is provided, and a support portion 3F that is formed on the edge portion 3B and protrudes toward the facing surface portion 11A. A substrate 6 is provided around the wall portion 3A. Edge portion 3B is provided along the inner peripheral surface of tubular portion 15 of first cover 11 . The edge portion 3B is formed with two insertion portions 3B1 into which screws (not shown) for fixing the base portion 3 and the first cover 11 are inserted. The battery containing portion 3C has a partition wall 3E1 that partitions the side on which the battery 7 is arranged and the side on which the substrate 6 is provided. A battery 7 is provided on the upper side of the battery housing portion 3C. The speaker housing portion 3D is a wall portion that surrounds the speaker 8. As shown in FIG. The speaker housing portion 3D is provided in an arc shape. The base portion 3 also has a surface portion 3D1 facing the upper surface of the speaker 8. As shown in FIG. The substrate placement portion 3E faces the edge of the substrate 6. As shown in FIG. The support portion 3F rotatably supports the shaft portion 21 of the pushing member 20. As shown in FIG.

As shown in FIG. 2, the lid portion 4 includes a lid main body 4A, a flange portion 4B provided on the edge of the lid main body 4A, and an optical bench cover 5 that allows smoke that has flowed into the housing 10 from the opening 1 to pass through. and a columnar introduction member 4C for guiding. The lid body 4A includes a plate-shaped speaker hole forming portion 4A1 having a speaker hole 4A8 formed therein, a wall portion 4A2 formed around the periphery of the speaker hole forming portion 4A1, and a wall portion 4A3 described later with reference to FIG. and an insertion portion 4A4 into which a screw (not shown) provided in one of the two insertion portions 3B1 is inserted. The lid main body 4A has an LED hole 4A5 through which an LED (not shown) of the substrate 6 that is lit when the switch 6A of the substrate 6 is pressed, etc., and an optical bench 4A6 provided with the optical bench cover 5 are 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 of the substrate 6 is inserted are formed. As shown in FIG. 4, the optical bench 4A6 is formed with a through hole 4A7 that communicates the darkroom portion Drm and the smoke detection space 3A3.

The optical bench cover 5 is a bowl-shaped member. The optical bench cover 5 is provided on the facing surface portion 11A of the first cover 11, and includes a lid-like portion 5A attached to the lid portion 4, and a cylindrical mesh portion having a plurality of holes through which smoke passes. 5B. The lid-shaped portion 5A and the mesh portion 5B have a light shielding function like the labyrinth wall Lb. Further, the mesh portion 5B prevents dust, insects, and the like from entering the darkroom portion Drm.

The substrates 6 are provided in parallel in the horizontal direction. Further, as shown in FIG. 2, the substrate 6 includes a light-emitting portion that can be configured by, for example, an LED, and a light-receiving portion that receives light from the light-emitting portion. Further, the substrate 6 has a shield case 6B for protecting the circuit of the light receiving section. Further, the substrate 6 is formed with an optical system placement portion 6C, which is a notch portion formed in accordance with the peripheral shape of the wall portion 3A of the base portion 3. As shown in FIG. The optical system arrangement portion 6C is provided with the light emitting portion and the light receiving portion described above.

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

As shown in FIGS. 2 and 3, the pushing member 20 includes a rotatable shaft portion 21 sandwiched between the support portion 3F of the base portion 3 and the support portion 11A3 of the facing surface portion 11A of the first cover 11, A push-in surface portion 22 connected to the shaft portion 21 and closing the opening portion 11A1 of the first cover 11 is provided.

FIG. 5 shows the DD end face shown in FIG. 4 of the base portion 3 and the lid portion 4. FIG. The configuration of the smoke sensor 100 will be continued with reference to FIG. The wall portion 3A includes a hole portion 3A1 facing the light emitting portion for smoke detection, a hole portion 3A2 facing the light receiving portion for smoke detection, and a projecting portion 3A4 that normally prevents the light from the light emitting portion from entering the light receiving portion. It has A smoke detection space 3A3 is formed inside the wall portion 3A. The smoke detection space 3A3 communicates with the darkroom section Drm described above.

A wall portion 4A2 of the lid portion 4 is provided around the speaker housing portion 3D. A wall portion 4A3 of the lid portion 4 is provided around the wall portion 3A and the substrate placement portion 3E. The wall portion 4A3 is hidden and not visible in FIG. 2 already described, but is formed on the back surface of the formation surface of the optical bench 4A6.

As shown in FIG. 4, inside the housing 10, a first space SP1, which is a smoke passage from the opening 1 to the optical bench cover 5, is formed. Further, as shown in FIG. 2, a second space SP2 in which the speaker 8 is provided is formed inside the housing 10. As shown in FIG. 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.

FIG. 6 is a sectional view taken along the line CC shown in FIG. 1(a). The operation of smoke detector 100 will now be described with reference to FIG. 6 and FIGS. 1-5 described above. When a fire or the like occurs, smoke flows through the opening 1 of the housing 10 into the first space SP1. The smoke that has flowed into the first space SP1 is guided to the optical bench cover 5 of the darkroom section Drm of the fire detection section Det by the introduction plate a1 and the like. Then, the smoke that has reached the periphery of the optical bench cover 5 flows into the space inside the optical bench cover 5 (the darkroom portion Drm of the fire detector Det) through the holes of the mesh portion 5B. The smoke that has flowed into the space inside the optical bench cover 5 flows into the through hole 4A7 of the lid portion 4 after passing through the labyrinth wall Lb. The smoke that has flowed into the through hole 4A7 flows into the smoke detection space 3A3. The smoke contains fine particles. These particles are heavier than smoke, so they are less likely to rise. Therefore, the particles remain on the optical bench cover 5, and the smoke flows into the smoke detection space 3A3. As a result, the smoke sensor 100 has improved fire detection accuracy. When smoke flows into the smoke detection space 3A3, the light emitted from the light emitting portion of the substrate 6 is scattered in the smoke detection space 3A3. The smoke sensor 100 senses a fire by detecting the scattered light with the light receiving portion of the substrate 6 .

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. When the diaphragm of the speaker 8 vibrates, the diaphragm of the speaker 8 generates sound waves, which are compressional waves. A sound wave generated by the speaker 8 propagates through the air and passes through the speaker hole 4A8. A part of the sound wave that has passed through the speaker hole 4A8 is reflected by the reflecting surface Rf of the facing surface portion 11A. As shown in FIG. 6, the sound wave Sw reflected by the reflecting surface Rf of the opposing surface portion 11A propagates radially from the speaker hole 4A8 side to the opening portion 1 side. The other part of the sound wave that has passed through the speaker hole 4A8 is diffracted by the speaker hole 4A8, and then propagates directly to the opening 1, or propagates to the opening 1 while being reflected by the partition member 30 or the facing surface 11A.

The sound wave Sw reaching the opening 1 spreads radially around the smoke sensor 100 . The sound wave Sw reaching the opening 1 is diffracted at the opening 1 and propagates below the smoke sensor 100 as well. In addition, the sound wave generated on the upper surface of the diaphragm of the speaker 8 is opposite in phase to the sound wave generated on the lower surface of the diaphragm of the speaker 8, but the sound wave generated on the upper surface of the diaphragm of the speaker 8 vibrates the surface portion 3D1 and the like. is attenuated by 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, effects of the embodiment will be described. The housing 10 of the smoke sensor 100 is configured such that the sound wave Sw radiated from the speaker hole 4A8 to the first space SP1 propagates from the speaker hole 4A8 side to the opening 1 side. That is, the sound wave Sw that has passed through the speaker hole 4A8 is reflected by the housing 10, the reflected sound wave Sw radially propagates from the speaker hole 4A8 side to the opening 1 side, and the sound wave Sw that reaches the opening 1 detects smoke. It spreads radially around the container 100 . Therefore, the smoke sensor 100 can expand the range in which a certain level or more of sound pressure can be secured when the speaker 8 generates sound.

Further, as described in the operation of the smoke sensor 100, the sound waves generated on the lower surface of the diaphragm of the speaker 8 are suppressed from being attenuated by the sound waves generated on the upper surface of the diaphragm of the speaker 8. Therefore, the smoke sensor 100 can further expand the range in which a certain level or more of sound pressure can be secured when the speaker 8 generates sound.

The facing surface portion 11A of the smoke sensor 100 faces the portion of the partition member 30 where the speaker hole 4A8 is formed, and reflects the sound wave Sw radiated from the speaker hole 4A8 to the first space SP1 to generate the sound wave. It has a reflecting surface Rf that propagates Sw to the opening 1 . The reflecting surface Rf is a closed surface without holes so that the reflecting surface Rf can effectively reflect the sound wave Sw. In other words, the reflective surface Rf can more reliably reflect the sound wave propagated from the speaker hole 4A8 and propagate it to the opening 1 side more reliably.

Since the facing surface portion 11A of the smoke sensor 100 is a flat member, the outer surface Sf1 of the facing surface portion 11A, that is, the design surface is a flat surface. Since the design surface of the opposing surface portion 11A of the smoke sensor 100 is flat in this manner, the smoke sensor 100 has an excellent appearance. Further, since the facing surface portion 11A of the smoke sensor 100 is a flat member, the sound wave Sw radiated from the speaker hole 4A8 into the first space SP1 is reflected by the facing surface portion 11A, and reaches the opening 1 more reliably. reach. Therefore, the smoke sensor 100 tends to spread the sound wave radially around the smoke sensor 100, and the smoke sensor 100 has a higher effect of expanding the range in which the sound pressure can be secured above a certain level when the speaker 8 generates sound. ing.

Also, an opening 11A1 is formed in the opposing surface portion 11A of the smoke sensor 100, but is closed by the pushing member 20. As shown in FIG. Therefore, the facing surface portion 11A of the smoke sensor 100 has no open portion. Therefore, even if the smoke sensor 100 is provided with the opening 11A1 and the push-in member 20 so as to facilitate inspection of the smoke sensor 100, the smoke sensor 100 has the above-described excellent aesthetic effect and It has the effect of expanding the range in which a certain level or more of sound pressure can be secured.

FIG. 7 shows a modification (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 opposite to that of the embodiment. That is, the first space SP1 is provided above the second space SP2. The configuration of the smoke sensor 101 according to the modification will be described.

The smoke sensor 101 includes a housing 71, a partition member 74 separating the first space SP1 and the second space SP2, an optical bench cover 75 provided on the partition member 74, and a and a speaker 78 provided under the partition member 74 . A housing 71 accommodates a partition member 74 , an optical bench cover 75 , a substrate 76 and a speaker 78 . The housing 71 includes a cylindrical side surface portion 71b having an opening 71A, a facing surface portion 71a provided above the partition member 30, and a flat design surface 71c. A reflecting surface Rf is formed on the lower surface of the facing surface portion 71a.

The partition 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-like portion 75A facing the opposing surface portion 71a, and a cylindrical mesh portion 75B having a plurality of holes through which smoke passes. Further, the optical bench cover 75 is provided with a labyrinth wall 75C having a light shielding function. The optical bench cover 75, the labyrinth wall 75C, and the optical bench 74C constitute the darkroom portion Drm. The substrate 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 partitioning member 74, and the light emitting section 76A and the light receiving section 76B face the dark room section 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 sensor 101 also has a battery. In a modified example, the partitioning member 74 may have a configuration corresponding to the battery accommodating portion 3C of the partitioning member 30. FIG. Also, in a variant, the battery can be arranged in the second space SP2.

Smoke sensor 101 according to the modification has the same effects as smoke sensor 100 according to the embodiment. Also, in the above description, the case where the sensor is a smoke sensor has been described as an example, but the present invention is not limited to this. The configurations and the like of the embodiments and modifications can also be applied to heat sensors. A heat sensor is a sensor that detects the occurrence of a fire by the heat generated when the fire occurs. For example, in the case of a differential heat sensor, the fire detection section corresponds to a configuration such as a thermistor, and in the case of a constant temperature type heat sensor, the fire detection section 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 the partition member 30. In the modified example, the first space SP1 and the second space SP1 A configuration in which the space SP2 is vertically separated by the partition member 74 has been described as an example. That is, in the embodiment and the modified example, the first space SP1 and the second space SP2 are vertically separated from each other, but the configuration is not limited to this. A sensor that is not separated vertically, for example, a sensor that is separated horizontally or obliquely by a partition member, or a sensor that partitions one space into two or more, is an embodiment. It is possible to obtain the same effect as the effect in the above and the effect in the modified example.

1 opening 1A upper opening 1B lower opening 1a partition member 3 base 3A wall 3A1 hole 3A2 hole 3A3 smoke detection space 3A4 projection 3B edge 3B1 insertion part , 3C battery housing portion, 3D speaker housing portion, 3D1 surface portion, 3E board placement portion, 3E1 partition wall, 3F support portion, 4 lid portion, 4A lid body, 4A1 speaker hole forming portion, 4A2 wall portion, 4A3 wall portion, 4A4 Insertion part 4A6 Optical bench 4A7 Through hole 4A8 Speaker hole 4A9 Switch hole 4B Flange part 4C Introduction member 4D5 LED hole 5 Optical bench cover 5A Lid-shaped part 5B Mesh part 6 Substrate 6A Switch , 6B shield case, 6C optical system arrangement portion, 7 battery, 8 speaker, 10 housing, 11 first cover, 11A facing surface portion, 11A1 opening portion, 11A2 concave portion, 11A3 support portion, 11B side portion, 12 second second cover, 13 main rib, 14 sub-rib, 15 cylindrical portion, 20 pushing member, 21 shaft portion, 22 pushing surface portion, 30 partitioning member, 71 housing, 71A opening, 71a facing surface portion, 71b side surface portion, 71c design surface, 74 partitioning member, 74A speaker hole forming portion, 74B speaker hole, 74C optical bench, 75 optical bench cover, 75A lid-shaped portion, 75B mesh portion, 75C labyrinth wall, 76 substrate, 76A light emitting portion, 76B light receiving portion, 78 speaker, 100 smoke detector, 101 smoke detector, 200 ceiling, Det fire detection part, Drm dark room part, Lb labyrinth wall, O1 center, O2 center, Pr surface, Rf reflection 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 portion.

Claims (3)

a housing having a cylindrical side surface with an opening;
A fire detection unit that is provided in the housing and detects smoke and heat;
a speaker that is provided in the housing and that generates sound by detecting smoke or heat by the fire detection unit;
a partitioning member provided in the housing for partitioning 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;
with
A speaker hole is formed in the partition member at a position where the speaker is provided,
The housing is configured such that sound waves radiated from the speaker hole to the first space propagate from the speaker hole side to the opening side,
The housing has a flat plate-like facing surface facing the partition member with the first space therebetween,
A portion of the facing surface portion facing the fire detection unit is a closed surface in which no holes are formed,
The facing surface portion faces a portion of the partition member where the speaker hole is formed, reflects the sound wave radiated from the speaker hole into the first space, and directs the sound wave to the opening. A sensor characterized by having a reflective surface for propagating. a housing having a cylindrical side surface with an opening;
A fire detection unit that is provided in the housing and detects smoke and heat;
a speaker that is provided in the housing and that generates sound by detecting smoke or heat by the fire detection unit;
a partitioning member provided in the housing for partitioning 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;
with
The first space is provided above the second space,
A speaker hole is formed in the partition member at a position where the speaker is provided,
The sensor, wherein the housing is configured such that a sound wave radiated from the speaker hole to the first space propagates from the speaker hole side to the opening side. The housing has a flat plate-like facing surface facing the partition member with the first space therebetween,
The facing surface portion faces a portion of the partition member where the speaker hole is formed, reflects the sound wave radiated from the speaker hole into the first space, and directs the sound wave to the opening. 3. The sensor of claim 2, comprising a propagating reflective surface.

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