Fire detection equipment

Abstract

The purpose of the present invention is to provide a fire detection device that can appropriately process light emitted in a detection space.　A sensor 100 for detecting fire in a monitoring region comprises: a detection space into which detection objects caused by fire flow; a light-emitting unit 71 that emits, into the detection space, emission light for detecting a detection object; and a light-receiving unit 72 that receives scattered light generated by the emission light being scattered by the detection object in the detection space. The detection space is provided with a first reflecting unit that does not reflect emission light toward the light-receiving unit 72 when emission light is irradiated, and a second reflecting unit that reflects emission light toward the light-receiving unit 72 when emission light is irradiated, the second reflecting unit being provided at a different position from that of the first reflecting unit. The emission light from the light-emitting unit 71 is directly irradiated on the first reflecting unit, and the emission light from the light-emitting unit 71 is not directly irradiated on the second reflecting unit.

Description

[Technical Field]

[0001] The present invention relates to a fire detection device. [Background technology]

[0002] Conventionally, scattered light detectors have been known (for example, Patent Document 1). These scattered light detectors detect fires based on scattered light generated by irradiating light onto smoke particles that have flowed into the detection space of the scattered light detector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-187462 Summary of the Invention [Problem to be solved by the invention]

[0004] In scattered light detectors, in order to improve the accuracy of fire detection, there has been a demand for technology that can appropriately process the light emitted into the detection space.

[0005] The present invention has been made in view of the above, and has an object to provide a fire detection device that is capable of appropriately processing light emitted into a detection space. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, a fire detection device according to claim 1 is a fire detection device for detecting a fire in a monitored area, comprising: a detection space into which a detection target caused by the fire flows; a light emitting unit that emits emission light into the detection space to detect the detection target; and a light receiving unit that receives scattered light generated when the emission light is scattered by the detection target in the detection space, wherein the detection space comprises: a first reflecting unit that does not reflect the emission light toward the light receiving unit when the emission light is irradiated; and a second reflecting unit that reflects the emission light toward the light receiving unit when the emission light is irradiated, the second reflecting unit being provided at a position different from the first reflecting unit, wherein the emission light from the light emitting unit is directly irradiated onto the first reflecting unit, and the emission light from the light emitting unit is directly irradiated onto the second reflecting unit. The detection space includes a fourth reflecting section that, when the emitted light is irradiated, captures a portion of the irradiated emitted light and does not reflect it toward the light receiving section and the second reflecting section, and reflects another portion of the irradiated emitted light toward the second reflecting section while diffusing the other portion, and the emitted light from the light emitting section is directly irradiated onto the first reflecting section and the fourth reflecting section.

[0007] Furthermore, the fire detection device described in claim 2 is the fire detection device described in claim 1, wherein the detection space is provided with a third reflecting section that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated, the third reflecting section being provided at a position different from the first reflecting section, and the first reflecting section reflects the emitted light directly irradiated from the light emitting section toward the third reflecting section.

[0008] Furthermore, the fire detection device described in claim 3 is the fire detection device described in claim 2, wherein the second reflecting portion is provided at a position opposite the light receiving portion, and the first reflecting portion and the third reflecting portion are provided on both sides of the second reflecting portion. [Effects of the Invention]

[0010] According to the fire detection device of claim 1, there is provided a first reflecting section that does not reflect the emitted light toward the light-receiving section when the emitted light is irradiated, and a second reflecting section that reflects the emitted light toward the light-receiving section when the emitted light is irradiated, and the emitted light from the light-emitting section is directly irradiated onto the first reflecting section, and the emitted light from the light-emitting section is not directly irradiated onto the second reflecting section, so that, for example, it is possible to prevent the emitted light from the light-emitting section from being directly irradiated onto the second reflecting section and the emitted light from being irradiated onto the light-receiving section, and therefore it is possible to appropriately process the light emitted into the detection space. For example, it is possible to prevent the light-receiving section from receiving a relatively large amount of light other than scattered light generated when the emitted light is scattered by the detection target due to a fire, and therefore it is possible to improve the accuracy of fire detection. Furthermore, by providing a fourth reflecting section that captures a portion of the irradiated outgoing light without reflecting it back to the light-receiving section and the second reflecting section, and that reflects the other portion of the irradiated outgoing light while diffusing it toward the second reflecting section, it is possible to prevent the light-receiving section from receiving a relatively large amount of light other than scattered light, thereby improving the accuracy of fire detection.Furthermore, it is possible to cause the light-receiving section to receive light with a relatively small amount of light, so that this light can be used to check the operation of the fire detection device.

[0011] Furthermore, according to the fire detection device described in claim 2, a third reflecting section is provided that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated, and the first reflecting section reflects the emitted light directly irradiated from the light emitting section toward the third reflecting section, thereby making it possible, for example, to diffuse and attenuate the emitted light irradiated toward the first reflecting section, thereby making it possible to prevent the light receiving section from receiving light with a relatively large amount of light other than scattered light.

[0012] Furthermore, according to the fire detection device described in claim 3, the second reflecting section is provided in a position opposite the light receiving section, and the first reflecting section and the third reflecting section are provided on both sides of the second reflecting section, respectively, thereby making it possible, for example, to appropriately process the light emitted into the detection space. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a side view of the sensor according to the present embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. [Figure 23] FIG. 2 is a perspective view of the smoke detection unit base. [Figure 24] FIG. 2 is a perspective view of the smoke detection unit base. [Figure 25] FIG. 2 is a side view of the smoke detection unit base. [Figure 26] FIG. 2 is a front view of the smoke detection unit base. [Figure 27] FIG. 2 is a rear view of the smoke detection unit base. [Figure 28] FIG. 2 is a diagram showing the inside of a detection space. [Figure 29] FIG. 2 is a diagram showing the inside of a detection space. [Figure 30] FIG. 2 is a diagram showing the inside of a detection space. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire detection device according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiment.

[0016] [Basic Concept of the Embodiment] First, the basic concept of the fire detection device according to this embodiment will be described. The fire detection device is a device for detecting fires in a monitored area. The "monitored area" is an area to be monitored by the fire detection device, and specifically refers to an indoor or outdoor area, such as a room, a stairwell, a hallway, or any other space.

[0017] In the following embodiment, the case where the "monitoring area" is a room will be described as an example.

[0018] [Specific details of each embodiment] Next, specific details of the embodiment will be described.

[0019] (composition) First, the configuration of the sensor of this embodiment will be described. Fig. 1 is a side view of the sensor according to this embodiment, Fig. 2 is a perspective view of the sensor, Fig. 3 is a front view of the sensor, Fig. 4 is a cross-sectional view taken along line AA in Fig. 3, and Figs. 5 and 6 are exploded perspective views of the sensor. In each figure, elements of the sensor 100 related to the features of the present application are illustrated and explained using reference numerals, and elements other than those explained may have the same configuration as conventional sensors. In Fig. 4, hatching of the cross section has been omitted for ease of explanation.

[0020] Note that the X, Y, and Z axes in each drawing are assumed to be mutually orthogonal, with the Z axis indicating the vertical direction (i.e., the lengthwise or thickness direction when the sensor 100 is installed), with the -Z direction being referred to as the front side and the +Z direction being referred to as the rear side. Also, the description will be given assuming that the X and Y axes indicate the horizontal direction (i.e., the lateral or widthwise direction when the sensor 100 is installed). Also, in the XY plane of FIG. 3, the direction away from the center of the sensor 100 will be referred to as the outer periphery side, and the direction approaching the center will be referred to as the inward side.

[0021] Note that reference line 801 in Fig. 1 is a center line that passes through the center of sensor 100 and is parallel to the vertical direction of the drawing, and is shown for convenience of explanation. Note that reference lines in the other drawings are also shown for convenience of explanation. Reference line 802 in Fig. 1 is a center line that passes through the center of detection element 700 and is parallel to the vertical direction of the drawing. Reference line 803 is a line that indicates the same height position as the front-most position of protrusion 23 (i.e., the same height position as the front-most position of step 231).

[0022] 3 is a center line that passes through the center of the sensor 100 and is parallel to the vertical direction of the drawing, and reference line 805 is a center line that passes through the center of the sensor 100 and is parallel to the horizontal direction of the drawing.

[0023] 4 is a center line that passes through the center of the light receiving portion 72 and is parallel to the up-down direction in the drawing, and reference line 807 is a center line that passes through the center of the light receiving portion 72 and is parallel to the left-right direction in the drawing. Reference line 808 in Fig. 4 is a line that indicates the same height position as the base 200, and reference line 809 is a line that indicates the same height position as the front-most position of the protrusion 23 (that is, the same height position as the front-most position of the step portion 231).

[0024] Reference lines 810 and 811 in FIGS. 5 and 6 are center lines that pass through the center of the sensor 100 and are parallel to the vertical direction of the drawings.

[0025] The detector 100 is a fire detection device provided in a monitored area, for example, a device for detecting a fire in the monitored area. The detector 100 is installed, for example, on a ceiling 900, which is an installation target.

[0026] The installation target of the sensor 100 is not limited to the ceiling 900, and it may also be, for example, a wall of a room (not shown), etc. However, in this embodiment, an example will be explained in which the installation target is the ceiling 900 (i.e., the sensor 100 is installed on the ceiling 900).

[0027] As shown in Figures 5 and 6, the detector 100 includes, for example, an outer cover 1, an inner cover 2, a smoke detection unit cover 3 (detection space cover), a smoke detection unit base 5, an insect screen 61 (Figure 6), a circuit board 62, a terminal board 63, a fitting 64, a detection element 700, a light-emitting unit 71, and a light-receiving unit 72.

[0028] (Configuration - Outer cover) 7 and 8 are perspective views of the outer cover, Fig. 9 is a side view of the outer cover, Fig. 10 is a front view of the outer cover, and Fig. 11 is a rear view of the outer cover. Note that in each figure, for the sake of convenience, with respect to multiple similar components (for example, connection portion 13, opening 14, etc. in Fig. 9), only some of the components will be described by assigning reference numerals (the same applies to other components in other figures).

[0029] In addition, the reference lines 812 and 814 in Figures 10 and 11 are center lines that pass through the center of the outer cover 1 and are parallel to the vertical direction of the drawing, and the reference lines 813 and 815 in Figures 10 and 11 are center lines that pass through the center of the outer cover 1 and are parallel to the horizontal direction of the drawing.

[0030] The outer cover 1 covers and houses the components of the detector 100 (the inner cover 2, the smoke detection unit cover 3, etc.) from the front side, and also forms part of the outer shape of the detector 100. The outer cover 1 is made of, for example, resin. The outer cover 1 includes, for example, a main body portion 11, a top plate portion 12, a connection portion 13, an opening portion 14, and a labyrinth portion 15 shown in FIG. 9.

[0031] (Configuration - Outer cover - Main body) The main body 11 is a part that has a substantially cylindrical shape with a predetermined diameter.

[0032] (Configuration - outer cover - top panel) The top plate 12 is a portion provided on the front side of the main body 11, and is a circular, flat plate-shaped portion with a diameter smaller than the outer periphery of the main body.

[0033] (Configuration - Outer cover - Connection part) The connection portion 13 is a portion that connects the main body portion 11 and the top plate portion 12 to each other, and is, for example, a portion that extends between the main body portion 11 and the top plate portion 12 as shown in FIG.

[0034] (Configuration - Outer cover - Opening) Opening 14 is an opening for allowing hot air currents to flow into and out of sensor 100. Opening 14 is formed in the gap between main body 11 and top plate 12, and is divided into multiple sections by multiple connecting sections 13.

[0035] The term "hot air current" refers to a fluid flow containing a detection target that occurs in association with a fire in the monitored area, for example, a relatively high-temperature fluid flow. The term "detection target" refers to an object detected by the detector 100, specifically, an object that occurs in association with a fire in the monitored area, for example, a concept including smoke particles that occur in association with a fire.

[0036] (Configuration - Outer cover - Labyrinth part) The labyrinth section 15 is a disturbance light processing section that prevents disturbance light from entering the detection space 300 (FIG. 4), and more specifically, it prevents disturbance light from entering the detection space 300 and introduces a fluid containing the detection target into the detection space 300. The labyrinth section 15 is provided outside the detection space 300. The labyrinth section 15 is provided on the opposite side of the disturbance light processing section from the mounting section for installing the sensor 100 on the ceiling 900, which is the installation target. The disturbance light processing section and the mounting section will be described later. The labyrinth section 15 includes, for example, a plurality of partition walls 151, as shown in FIG. 11.

[0037] The "detection space" 300 is a space for detecting smoke particles, which are the detection target caused by a fire, and is a light-shielded space.

[0038] The term "disturbance light" refers to light that is irradiated from outside the sensor 100 toward the sensor 100, and is a concept that includes, for example, natural light such as sunlight, or artificial light such as lighting.

[0039] The partition walls 151 are fixed to the rear surface of the top panel 12, protrude from the top panel 12 toward the rear by a predetermined height, and are adjacent to each other with a gap 152 between them. The partition walls 151 may be formed integrally with the top panel 12, or may be formed separately from the top panel 12 and fixed using an adhesive or the like. In this embodiment, however, the partition walls 151 are formed integrally with the top panel 12. In the assembled state of the sensor 100 shown in FIG. 1, the partition walls 151 are configured to stand upright from the upper surface (front surface) of the step portion 231 (see also FIG. 12 described below) of the inner cover 2. As shown in FIG. 11, the partition walls 151 extend from the inside to the outside of the sensor 100.

[0040] With this configuration, the hot air current is introduced into the detection space 300 through the gaps 152 between the partition walls 151. Furthermore, ambient light is blocked by the partition walls 151 and does not enter the detection space 300.

[0041] (Configuration - Inner cover) 12 and 13 are perspective views of the inner cover, FIG. 14 is a side view of the inner cover, FIG. 15 is a front view of the inner cover, and FIG. 16 is a rear view of the inner cover.

[0042] 15 and 16 indicates the major axis of the ellipse that is the circumferential shape of the protrusion 23 (FIG. 15), and also indicates the center line that passes through the center of the inner cover 2 and is parallel to the left-right direction in the drawing. The minor axis 230A in FIG. 15 and 16 indicates the minor axis of the ellipse that is the circumferential shape of the protrusion 23 (FIG. 15), and also indicates the center line that passes through the center of the inner cover 2 and is parallel to the up-down direction in the drawing.

[0043] The inner cover 2 covers and houses the components of the detector 100 (such as the smoke detection unit cover 3), and is circular in front view. The inner cover 2 is made of, for example, resin. The inner cover 2 includes, for example, a first opening 21, a second opening 22, and a protrusion 23 as shown in FIG. 12.

[0044] (Configuration - Inner cover - First opening) The first opening 21 is an opening for allowing the hot air current to flow into the detection space 300 and for allowing the hot air current to flow out from the detection space 300. As shown in Fig. 15 , the first opening 21 is, for example, a circular opening provided in the center of the inner cover 2 when viewed from the front.

[0045] (Configuration - Inner cover - Second opening) The second opening 22 is an opening through which the detection element 700 is inserted and disposed. As shown in Fig. 15 , the second opening 22 is, for example, a rectangular opening that has an elliptical shape when viewed from the front and is provided on both sides of the protruding portion 23 on the major axis 230 of the protruding portion 23.

[0046] (Configuration - Inner cover - Protrusion) The protruding portion 23 is a portion that protrudes toward the front side from the base portion 200 (FIGS. 12, 14, and 15) of the inner cover 2. As shown in FIG. 15, the protruding portion 23 has, for example, an elliptical shape when viewed from the front, and includes a step portion 231.

[0047] The step portion 231 is a part of the protrusion 23 and is a portion that protrudes and is higher than the base portion 200 .

[0048] (Configuration - Smoke detector cover) 17 to 19 are perspective views of the smoke detection unit cover, FIG. 20 is a side view of the smoke detection unit cover, FIG. 21 is a front view of the smoke detection unit cover, and FIG. 22 is a rear view of the smoke detection unit cover.

[0049] 21 is a center line that passes through the center of the smoke detection unit cover 3 and is parallel to the vertical direction of the drawing, and reference line 818 is a center line that is perpendicular to this. Optical axis 901 indicates the optical axis of the light-emitting unit 71 (FIG. 28) in the assembled detector 100. Optical axis 902 indicates the optical axis of the light-receiving unit 72 (FIG. 28) in the assembled detector 100. Reference line 817 in FIG. 22 is a center line that passes through the center of the smoke detection unit cover 3 and is parallel to the vertical direction of the drawing, and reference line 819 is a center line that is perpendicular to this.

[0050] The smoke detection unit cover 3, together with the smoke detection unit base 5, covers the detection space 300 (FIG. 4), the light-emitting side optical element 712 (FIGS. 5 and 6), and the light-receiving side optical element 722, i.e., it separates the inside and outside of the detection space 300. The smoke detection unit cover 3 is made of, for example, resin. A detailed description of this smoke detection unit cover 3 will be given later.

[0051] (Configuration - Smoke detector base) 23 and 24 are perspective views of the smoke detector base, FIG. 25 is a side view of the smoke detector base, FIG. 26 is a front view of the smoke detector base, and FIG. 27 is a rear view of the smoke detector base.

[0052] The smoke detector base 5, together with the smoke detector cover 3, covers the detection space 300 (FIG. 4), the light-emitting side optical element 712 (FIGS. 5 and 6), and the light-receiving side optical element 722, i.e., it separates the inside and outside of the detection space 300. The smoke detector base 5 is made of, for example, resin. The smoke detector base 5 is, for example, flat-plate shaped overall, and includes a light-emitting side housing section 51 (FIGS. 23 and 26), a light-receiving side housing section 52, and an attenuation section 53.

[0053] (Configuration - Smoke detector base - Each storage unit) The light-emitting side housing portion 51 is a portion that houses the light-emitting side optical element 712 (FIGS. 5 and 6).

[0054] The light-receiving side housing portion 52 is a portion that houses the light-receiving side optical element 722 (FIGS. 5 and 6).

[0055] (Configuration - Smoke detector base - Attenuation unit) The attenuation section 53 is a false alarm countermeasure that suppresses an increase in output due to dust or condensation, i.e., prevents the increase in output due to dust or condensation from being mistakenly detected as smoke particles, and is provided, for example, in a predetermined area on the front surface that forms the inner surface of the detection space 300 in the smoke detector base 5. The attenuation section 53 is formed, for example, by a combination of many ridges and grooves.

[0056] (Composition - Insect net) 6 is intended to prevent insects from entering the detection space 300 (FIG. 4) while allowing hot air currents to flow in and out of the detection space 300. The insect screen 61 is, for example, circular and provided at the first opening 21 of the inner cover 2, and is provided with a plurality of small holes (not shown) of a predetermined diameter that allow hot air currents to flow in and out and prevent insects from entering.

[0057] (Configuration - Board) 5 and 6 is a circuit board on which an electric circuit including various elements, ICs, electric wiring, etc. is mounted. As shown in Fig. 6, for example, a light-emitting element 711 and a light-receiving element 721 are mounted on the front surface of the board 62. In addition to these elements, a detection element 700 is also mounted on the board 62.

[0058] (Configuration - terminal board) 5 and 6 covers the components (smoke detection unit cover 3, etc.) of detector 100 from the rear side. Terminal board 63 is attached to ceiling 900 via fittings 64, i.e., it is an attachment part for attaching detector 100 to ceiling 900.

[0059] (Configuration - Fitting) The fitting 64 is detachably attached to the terminal board 63 and to a mounting structure on the ceiling 900 side (for example, a structure that fits or engages with the fitting 64 to fix the fitting 64). By using this fitting 64, the sensor 100 including the terminal board 63 can be attached to the ceiling 900. It should be noted that the fitting 64 may be interpreted as corresponding to the "mounting portion."

[0060] Furthermore, although not shown in the present embodiment, it is also possible to mount sensor 100 on ceiling 900 using a mounting base, which is a circular, plate-shaped member having approximately the same diameter as terminal board 63, and when this mounting base is used, the mounting base may be interpreted as corresponding to the "mounting portion." Note that the "mounting base" is a member that is provided between sensor 100 and ceiling 900 and that is used to install and mount sensor 100 on ceiling 900, but a known configuration can be applied, so detailed description will be omitted.

[0061] (Configuration - Detector element) 5 and 6 is a heat detection element that detects the heat of a hot airflow generated in association with a fire in the monitored area. The detection element 700 can be configured using, for example, a thermistor that detects a temperature corresponding to the heat and outputs temperature information indicating the detected temperature. The detection element 700 is mounted on the substrate 62 and inserted into the second opening 22 of the inner cover 2 in FIG. 12, with a portion of the detection element 700 protruding from the front side of the inner cover 2. Note that the detection element 700 does not necessarily have to be installed; if it is installed, it will be operated as a combined smoke and heat detector, and if it is not installed, it will be operated as a smoke-only detector.

[0062] (Configuration - Light-emitting part) 28 to 30 are diagrams showing the inside of the detection space. In addition, in Fig. 28 to Fig. 30, the interior of the smoke detection unit cover 3 is shown as viewed from the front side in the assembled detector 100, and for the sake of convenience, the attenuation unit 53 (Fig. 26) of the smoke detection unit base 5 and the like are omitted. In addition, in Fig. 29 and Fig. 30, the path of the light emitted from the light-emitting unit 71 is illustrated by arrows A1 to A6. In particular, arrows A1 to A6 illustrate the path of the light emitted from the light-emitting unit 71 in a direction parallel to the smoke detection unit base 5 (i.e., a direction parallel to the XY plane in Fig. 3).

[0063] 28 is a light emitting means that emits light for detecting smoke particles, which are the detection target, into the detection space 300. The light emitting unit 71 includes, for example, a light emitting element 711 and a light emitting side optical element 712, as shown in FIGS.

[0064] (Configuration - Light-emitting part - Light-emitting element) The light emitting element 711 is a component that emits light (emitted light), and can be configured using, for example, a light emitting diode (LED). The light emitting element 711 is mounted on the substrate 62.

[0065] (Configuration - Light-emitting part - Light-emitting optical element) The light-emitting side optical element 712 is a component that guides the light emitted by the light-emitting element 711 into the detection space 300 and emits it therefrom, and can be configured using, for example, a prism. The light-emitting side optical element 712 is housed in the smoke detection unit cover 3 and the smoke detection unit base 5, for example.

[0066] The light-emitting side optical element 712 is configured, for example, to emit light from the light-emitting element 711 mainly in a direction parallel to the smoke detection unit base 5 (that is, a direction parallel to the XY plane in FIG. 3). The light-emitting side optical element 712 is also configured, for example, to emit emitted light toward the first reflecting portion 401 and the fourth reflecting portion 404 in FIG. 28. The first reflecting portion 401 and the fourth reflecting portion 404 will be described later.

[0067] (Configuration - light receiving section) 28 is a light receiving means that receives scattered light generated when emitted light is scattered by smoke particles, which are the detection target, in the detection space 300. The light receiving unit 72 includes, for example, a light receiving element 721 and a light receiving side optical element 722, as shown in FIGS.

[0068] (Configuration - Light receiving section - Light receiving element) The light receiving element 721 is a component that receives light (scattered light, etc.), and can be configured using a photodiode, for example. The light receiving element 721 is mounted on the substrate 62.

[0069] (Configuration - Light receiving section - Light receiving optical element) The light-receiving side optical element 722 is a component that guides light in the detection space 300 to the light-receiving element 721, and can be configured using, for example, a prism. The light-receiving side optical element 722 is housed in the smoke detection unit cover 3 and the smoke detection unit base 5.

[0070] The light-receiving side optical element 722 is configured to guide scattered light that has been scattered by smoke particles and entered the light-receiving side optical element 722, and light that has been reflected by the second reflecting portion 402 and entered the light-receiving side optical element 722, to the light-receiving element 721. The light-receiving side optical element 722 is directed toward the second reflecting portion 402 so as to receive the light reflected by the second reflecting portion 402.

[0071] (Configuration - Other - Gas Sensor) In addition to the above configuration, a gas sensor (for example, a CO gas sensor) for detecting fire gas may be installed.

[0072] (Configuration - Smoke detector cover details) Next, details of the smoke detection unit cover 3 will be described. As shown in Fig. 17 to Fig. 19, the smoke detection unit cover 3 includes, for example, an opening 31, a light-emitting side housing section 32, a light-receiving side housing section 33, an inclined side wall section 34, a right-angled side wall section 35, a first wall section 41, a second wall section 42, a third wall section 43, a fourth wall section 44, a fifth wall section 45, a sixth wall section 46, a seventh wall section 47, and an adjustment section 48. Furthermore, as shown in Fig. 28, the smoke detection unit cover 3 includes, for example, a first reflecting section 401, a second reflecting section 402, a third reflecting section 403, and a fourth reflecting section 404.

[0073] (Configuration - Smoke detector cover details - Opening) The opening 31 is an opening for allowing the hot air flow to flow into the detection space 300 and for allowing the hot air flow to flow out from the detection space 300. The opening 31 is, for example, a circular opening as shown in FIG. 21 , and has approximately the same diameter as the first opening 21 of the inner cover 2.

[0074] (Configuration - Details of the smoke detector cover - Each storage section) The light-emitting side accommodating section 32 is a section that accommodates the light-emitting side optical element 712 (Figures 5 and 6), and is a section that is provided in a position corresponding to the light-emitting side accommodating section 51 of the smoke detection unit base 5 in the assembled state of the detector 100.

[0075] The light-receiving side accommodating section 33 is a section that accommodates the light-receiving side optical element 722 (Figures 5 and 6), and is a section that is provided in a position corresponding to the light-receiving side accommodating section 52 of the smoke detection unit base 5 in the assembled state of the detector 100.

[0076] (Configuration - Details of smoke detector cover - Inclined side wall) The inclined side wall portion 34 is a portion that forms part of the side surface of the smoke detection unit cover 3, and is provided in a position facing the light receiving side housing portion 33 across the opening 31 when viewed from the front, as shown in Figures 17 and 21. The inclined side wall portion 34 is inclined, for example, from the outer periphery of the smoke detection unit cover 3 toward the inside when viewed from the front, so as to be toward the front side (the lower side of the drawing in Figure 20).

[0077] (Configuration - Details of smoke detector cover - Right-angle side wall) The right-angled side wall 35 forms part of the side of the smoke detection unit cover 3, and is the part that is perpendicular to the flat plate-shaped part of the smoke detection unit base 5 in the assembled detector 100, as shown in Figures 18 and 22. The right-angled side wall 35 is the part that is provided next to the light-receiving-side housing 33.

[0078] (Configuration - Smoke detector cover details - each wall section) The first wall portion 41 to the seventh wall portion 47 are portions provided so as to stand on the inner surface of the inclined side wall portion 34, and are also portions provided with gaps between them. The first wall portion 41 to the seventh wall portion 47 are provided inside the detection space 300, for example, in the assembled sensor 100. The first wall portion 41 to the seventh wall portion 47 may be formed integrally with the smoke detection unit cover 3, or may be formed separately from the smoke detection unit cover 3 and then fixed using an adhesive or the like, but in this embodiment they are formed integrally (the same applies to the adjustment portion 48).

[0079] (Configuration - Smoke detector cover details - Adjustment section) The adjustment section 48 is a section that functions as a fourth reflecting section 404 (described later), and is, for example, a section that is provided on the inner surface of the right-angled sidewall section 35. As shown in FIGS. 18 and 28 , the adjustment section 48 is formed, for example, by a combination of numerous ridges and grooves. The slopes and heights (or depths) of the ridges and grooves of this adjustment section 48 are configured, for example, to capture a portion of the outgoing light irradiated onto the adjustment section 48 (for example, the outgoing light irradiated onto the grooves) and not reflect it toward the light receiving section 72 and the second reflecting section 402, and to diffuse and reflect the other portion of the irradiated outgoing light (for example, the outgoing light irradiated onto the peaks of the ridges) toward the second reflecting section 402. Note that when light is diffused, the following description will be given assuming that the light is attenuated.

[0080] (Configuration - Details of smoke detector cover - First reflector) The first reflecting portion 401 is a portion provided in the detection space 300, and is a portion that does not reflect the emitted light toward the second reflecting portion 402 and the light receiving portion 72 when the emitted light is irradiated thereto. The first reflecting portion 401 is the portion shown by hatching in Fig. 28, that is, the portion that is surrounded by the first wall portion 41 and the third wall portion 43, and is the portion where the first wall portion 41 to the third wall portion 43 are provided. For example, when the emitted light is irradiated thereto, the first reflecting portion 401 captures a portion of the emitted light and reflects another portion of the emitted light toward the third reflecting portion 403 while diffusing the other portion of the emitted light.

[0081] Note that "not reflecting emitted light toward the light receiving unit 72" is a concept that indicates, for example, that emitted light of an amount that would affect the operation of the sensor 100 is not reflected toward the light receiving unit 72. Also, "the first reflecting unit 401 reflects emitted light" is a concept that indicates, for example, that the components of the sensor 100 that are provided on the first reflecting unit 401 (for example, the first wall unit 41 to the third wall unit 43) reflect the emitted light. Similar expressions relating to other reflecting units also have the same concept.

[0082] Furthermore, the area corresponding to the first reflecting portion 401 shown by hatching in FIG. 28 may be interpreted as corresponding to the "predetermined area."

[0083] (Configuration - Details of smoke detector cover - Second reflector) The second reflecting portion 402 is a portion provided in the detection space 300, which reflects the emitted light toward the light receiving portion 72 when the emitted light is irradiated thereto, and is a portion provided in a position different from that of the first reflecting portion 401. The second reflecting portion 402 is the portion shown by hatching in Fig. 28, that is, the portion surrounded by the third wall portion 43 and the sixth wall portion 46, and is the portion where the third wall portion 43 to the sixth wall portion 46 are provided. The second reflecting portion 402 is a portion provided in a position facing the light receiving portion 72, for example.

[0084] (Configuration - Details of smoke detector cover - Third reflector) The third reflecting portion 403 is a portion provided in the detection space 300, which does not reflect the emitted light toward the second reflecting portion 402 and the light receiving portion 72 when the emitted light is irradiated thereto, and is a portion provided at a position different from that of the first reflecting portion 401. The third reflecting portion 403 is the portion shown by hatching in FIG. 28, that is, the portion surrounded by the sixth wall portion 46 and the seventh wall portion 47.

[0085] The third reflecting portion 403 is, for example, a portion provided on the opposite side of the first reflecting portion 401 with respect to the second reflecting portion 402 in a front view. In other words, the third reflecting portion 403 and the first reflecting portion 401 are portions provided on both sides of the second reflecting portion 402 in a front view.

[0086] For example, when emitted light is irradiated onto the third reflecting portion 403, the third reflecting portion 403 captures a part of the emitted light and reflects the other part of the emitted light toward the first reflecting portion 401 while diffusing the light.

[0087] (Configuration - Details of smoke detector cover - 4th reflector) The fourth reflecting section 404 is a section provided in the detection space 300, and when irradiated with output light, captures a portion of the irradiated output light without reflecting it toward the light receiving section 72 and the second reflecting section 402, and reflects the other portion of the irradiated output light while diffusing it toward the second reflecting section 402. The fourth reflecting section 404 is a section formed by the adjusting section 48 as shown in FIG.

[0088] In addition, the four reflecting sections, the first reflecting section 401 to the fourth reflecting section 404, or each component of the sensor 100 that constitutes these reflecting sections may be interpreted as corresponding to the "internal turbulence light processing section," or alternatively, only the first reflecting section 401 and the third reflecting section 403, or only each component of the sensor 100 that constitutes these reflecting sections, may be interpreted as corresponding to the "internal turbulence light processing section."

[0089] The “internal disturbance light processing section” is a section that processes internal disturbance light other than scattered light that occurs within the detection space 300 due to emitted light, and is, for example, provided inside the detection space 300.

[0090] "Internal disturbance light" is a concept that refers to light other than scattered light scattered by smoke particles among the light emitted from the light-emitting unit 71, and includes, for example, the emitted light itself or reflected emitted light.

[0091] "Processing turbulent light" is a concept that indicates adjusting the direction or amount of turbulent light, and includes, for example, reflecting and diffusing turbulent light, or capturing and attenuating turbulent light.

[0092] (Assembly procedure for detector) Next, a description will be given of a procedure for assembling the sensor 100. Here, an example of a procedure for assembling the sensor 100 will be described mainly with reference to FIGS.

[0093] First, the light-emitting side optical element 712 and the light-receiving side optical element 722 are housed in the light-emitting side housing portion 51 (FIGS. 23 and 26) and the light-receiving side housing portion 52 of the smoke detector base 5.

[0094] Next, the smoke detector cover 3 is attached to the smoke detector base 5 by any method (for example, by using the engagement structure provided in each component). In this case, the light-emitting side optical element 712 and the light-receiving side optical element 722 are also housed in the light-emitting side housing portion 32 (FIG. 19) and the light-receiving side housing portion 33 of the smoke detector cover 3.

[0095] Next, the substrate 62 (FIG. 4) on which the light-emitting element 711, the light-receiving element 721, and the detecting element 700 are mounted is attached to the terminal board 63 from the front side (upper side in FIG. 6) of the terminal board 63 by any method (for example, by screwing). Also, the fitting 64 is attached to the terminal board 63 from the rear side (lower side in FIG. 6) of the terminal board 63 by any method (for example, by screwing).

[0096] Next, the smoke detector base 5 with the smoke detector cover 3 attached is attached to the substrate 62 from the front side of the substrate 62 (upper side of the drawing in Figure 6) using any method (for example, a method using the engagement structure provided in each component, or a method of screwing together with screws, etc.).

[0097] Next, the inner cover 2 is attached to the terminal board 63 from the front side (upper side in FIG. 6) of the terminal board 63 to which the smoke detection unit cover 3 and the like are attached, by any method (for example, a method using an engagement structure provided on each component). In this case, a part of the detection element 700 is inserted into the second opening 22 (FIG. 12) of the inner cover 2 and protrudes from the inner cover 2 toward the front side, as shown in FIG.

[0098] Next, the insect screen 61 is installed in the first opening 21 of the inner cover 2.

[0099] Next, the outer cover 1 is attached to the terminal board 63 from the front side (upper side in FIG. 6) of the terminal board 63 to which the inner cover 2 and other components are attached, using any method (for example, a method that utilizes the engagement structure provided on each component). In this case, as shown in FIG. 1, the labyrinth portion 15 of the outer cover 1 abuts against the protruding portion 23 of the inner cover 2. Furthermore, a part of the partition wall 151 of the labyrinth portion 15 (the crossing portion that intersects in a crisscross shape at the center of the outer cover 1 in FIG. 11) presses down on the insect screen 61, thereby fixing the insect screen 61 to the sensor 100. In this way, the assembly of the sensor 100 shown in FIGS. 1 to 4 is completed.

[0100] (Path of emitted light (processing of turbulent light)) Next, the path of the light emitted from the light-emitting unit 71 will be described. That is, the processing of internal turbulence light by each reflecting unit will be described. As shown by arrows A1 to A6 in Figs. 29 and 30, the light emitted from the light-emitting unit 71 is directly irradiated onto, for example, the first reflecting unit 401 and the fourth reflecting unit 404, but is not directly irradiated onto the second reflecting unit 402 or the light-receiving unit 72. Note that "directly irradiated" is a concept that indicates that the light is directly irradiated without being reflected or scattered.

[0101] (Path of outgoing light - outgoing light directly incident on the first reflector) As shown in Figure 29, a portion of the emitted light directly irradiated onto the first reflecting portion 401 is captured between the first wall portion 41 and the second wall portion 42, or between the second wall portion 42 and the third wall portion 43, as shown by arrows A2 and A4, and is not reflected by other reflecting portions and the light receiving portion 72.

[0102] Furthermore, as indicated by arrows A1 and A3, another portion of the emitted light directly incident on the first reflecting portion 401 is reflected by the first wall portion 41 or the second wall portion 42 while being diffused toward the third reflecting portion 403. Thereafter, the reflected emitted light is captured by the third reflecting portion 403 or reflected by the first reflecting portion 401, and is not reflected by the second reflecting portion 402, the fourth reflecting portion 404, or the light receiving portion 72.

[0103] (Path of the exiting light - exiting light directly incident on the fourth reflector) Also, as shown in Figure 30, a portion of the emitted light directly irradiated onto the fourth reflecting portion 404 is captured in the groove portion of the adjustment portion 48 that forms the fourth reflecting portion 404, as shown by arrow A6, and is not reflected by other reflecting portions and the light receiving portion 72.

[0104] Furthermore, as indicated by arrow A5, another portion of the emitted light directly incident on fourth reflecting portion 404 is reflected and diffused by the top of the mountain portion of adjustment portion 48 that forms fourth reflecting portion 404 toward second reflecting portion 402. Thereafter, the reflected emitted light is reflected and diffused by third wall portion 43 of second reflecting portion 402 toward light receiving portion 72.

[0105] That is, in this case, the emitted light, which has been reflected and diffused multiple times after being emitted from the light-emitting unit 71 and has a relatively small amount of light, is received by the light-receiving unit 72. Note that the amount of light here is sufficiently smaller than the amount of light scattered by smoke particles and can be distinguished from the amount of scattered light. Therefore, it is possible to confirm whether the detector 100 is operating normally by emitting light from the light-emitting unit 71 at a predetermined cycle and determining whether the light-receiving unit 72 can receive the emitted light, which has a relatively small amount of light, at the timing corresponding to the timing of the emission.

[0106] (Path of emitted light - Smoke detector base side) It is also assumed that part of the emitted light will be irradiated onto the smoke detection unit base 5 within the detection space 300. In this case, since the smoke detection unit base 5 is provided with an attenuation section 53 (Figure 23), this attenuation section 53 can attenuate the irradiated emitted light, allowing the sensor 100 to operate normally.

[0107] In addition, when the detector 100 is installed on the ceiling 900 as shown in Figure 1, the attenuation section 53 of the smoke detection unit base 5 is oriented, for example, vertically downward as shown in Figure 23, thereby preventing dust and other particles from accumulating in the grooves of the attenuation section 53 and preventing diffuse reflection caused by the dust and other particles.

[0108] (Prevents the entry of external light) Next, we will explain how to prevent the entry of disturbance light. In Figure 1, disturbance light from outside the sensor 100 is blocked by the multiple partition walls 151 (Figure 11) of the labyrinth section 15, so that disturbance light is prevented from entering the detection space 300 through the opening 31 of the smoke detection section cover 3.

[0109] (hot air flow supply) Next, the supply of a hot air current containing smoke particles to the detector 100 when a fire breaks out in the monitored area will be described.

[0110] First, in FIG. 1, a hot air current generated in the monitoring area flows into the interior of the outer cover 1 through the opening 14 of the outer cover 1.

[0111] Next, part of the inflowing hot air current is supplied to the detection element 700 along the outer peripheral wall of the step portion 231. Another part of the inflowing hot air current is supplied from the outer peripheral side of the detector 100 to the inside through the gaps 152 (FIG. 11) between the multiple partition walls 151 of the labyrinth portion 15, and flows into the detection space 300 through the first opening 21 of the inner cover 2 and the opening 31 of the smoke detection unit cover 3. In particular, since an insect screen 61 (FIG. 6) is provided at the first opening 21 of the inner cover 2, the hot air current flows into the detection space 300 through multiple small holes (not shown) in the insect screen 61.

[0112] Here, since the first opening 21 of the inner cover 2 and the opening 31 of the smoke detection unit cover 3 are circular, the variation in the inflow characteristics of the hot air flow relative to the inflow direction is kept relatively small, making it possible to reliably allow hot air flow from any direction into the detection space 300.

[0113] (Fire detection operation) Next, we will explain the operation of fire detection by sensor 100. Sensor 100 performs an operation to detect a fire based on, for example, the amount of light received by light receiving unit 72 or the temperature of the hot air current detected by detection element 700, but since this operation can be performed using known operations, only an outline will be explained.

[0114] (Fire detection operation - when no fire is detected) For example, if no fire has broken out in the monitored area, no hot air current containing smoke particles will flow into detection space 300 in Fig. 28, and therefore light receiving unit 72 will receive a relatively small amount of light that is emitted from light emitting unit 71, then reflected by fourth reflecting unit 404 and second reflecting unit 402. In this case, sensor 100 will not detect a fire.

[0115] Furthermore, since the hot airflow containing smoke particles is not supplied to the detection element 700, the temperature detected by the detection element 700 is at room temperature level. In this case, the detector 100 does not detect a fire.

[0116] (Fire detection operation - when detecting a fire) On the other hand, for example, if a fire breaks out in the monitored area, a hot air current containing smoke particles will flow into detection space 300 in Fig. 28, and the light emitted from light-emitting unit 71 will be irradiated onto the smoke particles, generating a relatively large amount of scattered light, which will be received by light-receiving unit 72. In this case, sensor 100 will detect the fire.

[0117] Also, for example, a hot air current containing smoke particles is supplied to the detection element 700, causing the temperature detected by the detection element 700 to rise to a predetermined level. In this case, the detector 100 detects a fire.

[0118] The fire detection operation described here is an example and is not limiting. More specifically, the following operation may be performed.

[0119] For example, the light receiving unit 72 may be configured to detect a fire when it receives a relatively large amount of light and the temperature detected by the detection element 700 rises to a predetermined level, or the light receiving unit 72 may be configured to detect a fire when it receives a relatively large amount of light, regardless of the temperature detected by the detection element 700.

[0120] (Effects of the embodiment) As described above, according to the embodiment, the first reflecting portion 401 does not reflect the emitted light toward the light-receiving portion 72 when irradiated with the emitted light, and the second reflecting portion 402 reflects the emitted light toward the light-receiving portion 72 when irradiated with the emitted light is provided, and the emitted light from the light-emitting portion 71 is directly irradiated onto the first reflecting portion 401, but the emitted light from the light-emitting portion 71 is not directly irradiated onto the second reflecting portion 402. This makes it possible to prevent, for example, the emitted light from the light-emitting portion 71 from being directly irradiated onto the second reflecting portion 402 and being irradiated onto the light-receiving portion 72, and therefore makes it possible to appropriately process the light emitted into the detection space 300. For example, it is possible to prevent the light-receiving portion 72 from receiving a relatively large amount of light other than scattered light generated when the emitted light is scattered by smoke particles caused by a fire, and therefore makes it possible to improve the accuracy of fire detection.

[0121] In addition, the device is provided with a third reflecting section 403 that does not reflect the emitted light toward the light receiving section 72 when the emitted light is irradiated, and the first reflecting section 401 reflects the emitted light directly irradiated from the light emitting section 71 toward the third reflecting section 403, thereby making it possible to, for example, diffuse and attenuate the emitted light irradiated to the first reflecting section 401, and therefore to prevent the light receiving section 72 from receiving light with a relatively large amount of light other than scattered light.

[0122] Furthermore, the second reflecting section 402 is provided at a position opposite the light receiving section 72, and the first reflecting section 401 and the third reflecting section 403 are provided on either side of the second reflecting section 402, thereby making it possible to appropriately process, for example, the light emitted into the detection space 300.

[0123] Furthermore, by providing the fourth reflecting section 404, which captures a portion of the irradiated outgoing light and does not reflect it toward the light-receiving section 72 and the second reflecting section 402, and which reflects the other portion of the irradiated outgoing light while diffusing it toward the second reflecting section 402, it is possible to prevent the light-receiving section 72 from receiving a relatively large amount of light other than scattered light, thereby improving the accuracy of fire detection. Also, since it is possible to cause the light-receiving section 72 to receive light with a relatively small amount of light, it is possible to use that light to check the operation of the detector 100.

[0124] [Modifications to the embodiment] Although the embodiments of the present invention have been described above, the specific configurations and means of the present invention can be modified and improved as desired within the scope of the technical ideas of the inventions set forth in the claims. Such modifications will be described below.

[0125] (About the problem to be solved and the effects of the invention) First, the problems that the invention aims to solve and the effects of the invention are not limited to those described above, and the present invention may solve problems that are not described above or achieve effects that are not described above, or may solve only some of the problems that are described or achieve only some of the effects that are described.

[0126] (About the labyrinth section) In the above embodiment, the labyrinth portion 15 in Fig. 8 is provided on the outer cover 1, but this is not limiting. For example, the labyrinth portion 15 may be provided on the inner cover 2. Specifically, the labyrinth portion 15 may be formed integrally with the inner cover 2, or the labyrinth portion 15 may be formed separately and fixed to the inner cover 2 using an adhesive or the like.

[0127] (Regarding the adjustment part) In the above embodiment, the case where the adjustment unit 48 in FIG. 18 has a structure formed by a combination of numerous ridges and grooves has been described, but this is not limiting. For example, the adjustment unit 48 may be configured as a flat plate-like portion without ridges or grooves. In this case, taking into consideration that the light emitted from the light-emitting unit 71 is reflected by the flat plate-like portion at a reflection angle corresponding to the angle of incidence, the flat plate-like portion may be configured as follows. For example, the light-receiving unit 72 may be configured to receive a relatively small amount of light by configuring the flat plate-like portion so that a portion of the divergent emitted light is reflected by the flat plate-like portion toward the second reflecting unit 402 and another portion of the divergent emitted light is reflected toward the first reflecting unit 401.

[0128] (Regarding the ambient light processing section) In the above embodiment, the labyrinth portion 15 is used as the disturbance light processing portion, but this is not limiting. For example, a prevention member for preventing disturbance light from entering the detection space 300 may be provided separately from the labyrinth portion 15, and the prevention member may be used as the disturbance light processing portion.

[0129] (About combinations) The features of the above-described embodiment and the features of the modifications may be combined in any manner.

[0130] (Addendum) The fire detection device of Appendix 1 is a fire detection device for detecting fires in a monitored area, and comprises: a detection space into which a detection target caused by the fire flows; an emitter that emits emission light into the detection space to detect the detection target; and a light receiving unit that receives scattered light generated when the emission light is scattered by the detection target in the detection space, wherein the detection space comprises: a first reflector that does not reflect the emission light toward the light receiving unit when the emission light is irradiated; and a second reflector that reflects the emission light toward the light receiving unit when the emission light is irradiated, the second reflector being located at a position different from the first reflector, and wherein the emission light from the light emitting unit is directly irradiated onto the first reflector, and the emission light from the light emitting unit is not directly irradiated onto the second reflector.

[0131] The fire detection device of Appendix 2 is the fire detection device described in Appendix 1, wherein the detection space comprises a third reflecting section that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated, the third reflecting section being provided at a position different from the first reflecting section, and the first reflecting section reflects the emitted light directly irradiated from the light emitting section toward the third reflecting section.

[0132] The fire detection device of Appendix 3 is the fire detection device described in Appendix 2, wherein the second reflecting unit is provided at a position opposite the light receiving unit, and the first reflecting unit and the third reflecting unit are provided on both sides of the second reflecting unit.

[0133] The fire detection device of Supplementary Note 4 is a fire detection device described in any one of Supplementary Notes 1 to 3, wherein the detection space includes a fourth reflecting section that, when the emitted light is irradiated, captures a portion of the irradiated emitted light and does not reflect it toward the light receiving section and the second reflecting section, and reflects another portion of the irradiated emitted light toward the second reflecting section while diffusing it, and the emitted light from the light emitting section is directly irradiated onto the first reflecting section and the fourth reflecting section.

[0134] (Effect of supplementary notes) The fire detection device described in Supplementary Note 1 includes a first reflecting section that does not reflect the emitted light toward the light-receiving section when the emitted light is irradiated, and a second reflecting section that reflects the emitted light toward the light-receiving section when the emitted light is irradiated. The emitted light from the light-emitting section is directly irradiated onto the first reflecting section, and the emitted light from the light-emitting section is not directly irradiated onto the second reflecting section. This prevents, for example, the emitted light from the light-emitting section from being directly irradiated onto the second reflecting section and being irradiated onto the light-receiving section, thereby making it possible to appropriately process the light emitted into the detection space. For example, it is possible to prevent the light-receiving section from receiving a relatively large amount of light other than scattered light generated when the emitted light is scattered by the detection target due to a fire, thereby improving the accuracy of fire detection.

[0135] According to the fire detection device described in Appendix 2, the device is provided with a third reflecting section that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated, and the first reflecting section reflects the emitted light directly irradiated from the light emitting section toward the third reflecting section, thereby making it possible, for example, to diffuse and attenuate the emitted light irradiated toward the first reflecting section, thereby making it possible to prevent the light receiving section from receiving light with a relatively large amount of light other than scattered light.

[0136] According to the fire detection device described in Appendix 3, the second reflecting section is provided in a position opposite the light receiving section, and the first reflecting section and the third reflecting section are provided on both sides of the second reflecting section, respectively, thereby making it possible, for example, to appropriately process the light emitted into the detection space.

[0137] According to the fire detection device described in Supplementary Note 4, by providing a fourth reflecting section that captures a portion of the irradiated outgoing light without reflecting it to the light-receiving section and the second reflecting section, and that reflects the other portion of the irradiated outgoing light while diffusing it toward the second reflecting section, it is possible to prevent the light-receiving section from receiving a relatively large amount of light other than scattered light, thereby improving the accuracy of fire detection. Also, since it is possible to cause the light-receiving section to receive light with a relatively small amount of light, it is possible to use that light to check the operation of the fire detection device. [Explanation of symbols]

[0138] 1 Outer cover 2 Inner cover 3 Smoke detector cover 5 Smoke detector base 11 Main body 12 Top plate 13 Connection 14 Openings 15 Labyrinth Club 21 First opening 22 Second opening 23 Protrusion 31 Opening 32 Light-emitting side housing section 33 Light receiving side housing 34 Slanted side wall section 35 Right-angle side wall 41 1st wall 42 2nd wall section 43 Third wall 44 4th wall 45 Fifth wall 46 6th wall 47 7th wall 48 Adjustment part 51 Light-emitting side housing section 52 Light receiving side housing 53 Attenuation section 61 Insect net 62 PCB 63 Terminal board 64 Metal fittings 71 Light-emitting part 72 Light receiving part 100 sensors 151 Compartment wall 152 Gap 200 base 230 long axis 230A short shaft 231 Multilayered section 300 Detection Space 401 1st reflection section 402 2nd reflection section 403 Third reflection section 404 4th reflection section 700 detector element 711 Light-emitting element 712 Light-emitting optical element 721 Photodetector 722 Light receiving optical element 801 Baseline 802 Reference Line 803 Reference Line 804 Reference Line 805 Reference Line 806 Reference Line 807 Reference Line 808 Reference Line 809 Reference Line 810 Reference Line 811 Reference Line 812 Reference Line 813 Reference Line 814 Reference Line 815 Baseline 816 Reference Line 817 Reference Line 818 Reference Line 819 Reference Line 900 ceiling 901 Optical axis 902 Optical axis A1 Arrow A2 Arrow A3 Arrow A4 arrow A5 Arrow A6 Arrow

Claims

1. 1. A fire detection device for detecting fires in a monitored area, comprising: a detection space into which a detection target caused by the fire flows; a light emitting unit that emits light for detecting the detection target into the detection space; a light receiving unit that receives scattered light generated when the emitted light is scattered by the detection object in the detection space, The detection space is a first reflecting section that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated; a second reflecting section that reflects the emitted light toward the light receiving section when the emitted light is irradiated thereto, the second reflecting section being provided at a position different from that of the first reflecting section; the emitted light from the light emitting portion is directly irradiated onto the first reflecting portion, the emitted light from the light emitting portion is not directly irradiated onto the second reflecting portion, The detection space is a fourth reflecting section that, when the emitted light is irradiated, captures a portion of the irradiated emitted light and does not reflect it toward the light receiving section and the second reflecting section, and reflects another portion of the irradiated emitted light toward the second reflecting section while diffusing it; the emitted light from the light emitting unit is directly irradiated onto the first reflecting unit and the fourth reflecting unit; Fire detection equipment.

2. the detection space includes a third reflecting section that does not reflect the emitted light toward the light receiving section when the emitted light is irradiated thereto, the third reflecting section being provided at a position different from that of the first reflecting section, The first reflecting portion reflects the emitted light directly emitted from the light emitting portion toward the third reflecting portion. The fire detection device according to claim 1 .

3. the second reflecting portion is provided at a position facing the light receiving portion, The first reflecting portion and the third reflecting portion are provided on both sides of the second reflecting portion, respectively. The fire detection device according to claim 2.

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