JP7208730B2 - fire detection device - Google Patents

Description

The present invention relates to fire detection devices.

Conventionally, techniques for irradiating a detection space inside a smoke sensor with detection light have been proposed for a smoke sensor that detects a fire in a monitored area. In this technique, for example, a housing that can accommodate a substrate on which components including a light emitting unit and a light receiving unit are mounted and a detection space, and a flat base provided on the detection space side of the substrate, and a base supporting the light emitting part and the light receiving part so that the light emitting part and the light receiving part are positioned on the side surface of the base on the detection space side. The light emitting unit is supported on the base so that the irradiation direction of the detection light emitted from the light emitting unit is substantially parallel to the detection space side of the base (for example, Patent Document 1 reference).

JP 2012-256250 A

However, in the conventional technique described above, since the base is flat, it is relatively difficult to secure a space between the base and the board for accommodating the components mounted on the board. As a result, there is a possibility that it may become difficult to increase the accommodation capacity of the parts. In addition, due to the shape of the substrate described above, when the detection light emitted from the light-emitting part is incident on the base, the incident detection light is reflected toward the light-receiving part, even if smoke is not detected. In spite of this, the amount of light received by the light-receiving unit may become excessively large, which may make it difficult to maintain the detection accuracy of a fire detection device such as a smoke sensor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fire detection device that can improve the housing capacity of components or maintain the detection accuracy of the fire detection device.

In order to solve the above-described problems and achieve the object, the fire detection device according to claim 1 is a fire detection device for detecting fire in a monitoring area, comprising a detection space for detecting a detection target and , a detection means for detecting the object to be detected by irradiating and receiving detection light in the detection space; The incident suppressing means comprises: a cover portion covering the outer periphery of the detection space; a base portion provided closer to the substrate than the cover portion and covering the substrate; a concave portion formed in a concave shape on a predetermined portion of the base portion, and the detecting means includes a first light emitting portion that emits first detection light, which is the detection light, and the first light emitting portion that has a different wavelength from the first detection light. A second light-emitting portion that emits second detection light, which is detection light, and a light-receiving portion that receives the first detection light and the second detection light, and the predetermined portion is the portion of the base portion. Including a detection space side portion, the concave portion is formed so as to be capable of suppressing reflection of the detection light incident on the detection space side portion toward the detection means, and the concave portion is the first light emitting portion. a first detection space-side recess located near the second light-emitting portion; a second detection space-side recess located near the light-receiving portion; Any one of the first detection space side recess, the second detection space side recess, or the third detection space side recess when viewed from a direction substantially the same as the depth direction of the recess is the first light emitting portion. The first detection space side concave portion, the second detection space side concave portion, and the third detection space side concave portion are arranged so as to overlap the optical axis, the optical axis of the second light emitting portion, and the optical axis of the light receiving portion. bottom.

The fire detection device according to claim 2 is the fire detection device according to claim 1, wherein the first detection space side recess, the second detection space side recess, and the third detection space side recess are adjacent to each other. and the depth of each of the first detection space side recess, the second detection space side recess, and the third detection space side recess is individually set according to the extent to which the reflection of the detection light is suppressed. bottom.

The fire detection device according to claim 3 is the fire detection device according to claim 1 or 2, wherein the predetermined portion includes a portion of the base portion on the side of the substrate, and the concave portion is the substrate. At least a portion of the component mounted on the recess is formed so as to be accommodated in the recess.

According to a fourth aspect of the present invention, there is provided a fire detection device according to the third aspect, wherein the predetermined portion includes a portion of the substrate side portion facing the component.

According to the fire detection device according to claim 1, the incident suppressing means for suppressing the incidence of ambient light into the detection space includes a cover portion that covers the outer periphery of the detection space, and a cover portion that is closer to the substrate than the cover portion. Since the incident suppressing means having the provided base portion and the concave portion formed by forming a predetermined portion of the base portion in a concave shape are provided, for example, components can be accommodated inside the concave portion. Therefore, since it becomes easy to secure a space for mounting components between the base portion and the substrate, it is possible to improve the accommodation of the components. Further, for example, the concave portion can suppress reflection of the detection light incident on the base portion toward the detecting means. Therefore, it is possible to prevent the amount of light received by the detection means from becoming excessive even though the detection target is not detected, and it is possible to maintain the detection accuracy of the fire detection device.
Further, since the predetermined portion includes the detection space side portion of the base portion, and the concave portion is formed so as to suppress reflection of the detection light incident on the detection space side portion toward the detection means, It is possible to suppress reflection of the detection light incident on the detection space side of the base portion toward the detection means, thereby further avoiding an excessive amount of light received by the detection means.

According to the fire detection device of claim 3, the predetermined portion includes the substrate-side portion of the portion of the base portion, and the recess is formed so that at least part of the component can be accommodated in the recess. A space for mounting a component can be formed in the part on the board side of the part, and it becomes easier to secure the space.

According to the fire detection device of claim 4, since the predetermined portion includes the portion facing the component in the portion on the substrate side, the space for mounting the component can be effectively formed, and the space can be made compact. It is possible to plan

It is a side view which shows the attachment condition of the fire detection apparatus which concerns on embodiment. It is a bottom view which shows the fire detection apparatus of the state which removed the mounting base. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; It is a figure which shows a detection part main body, (a) is a top view, (b) is a bottom view. It is a figure which shows the test result of a light reception test.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fire detection device according to the present invention will be described in detail below with reference to the drawings. First, [I] the basic concept of the embodiment will be described, then [II] the specific contents of the embodiment will be described, and finally [III] modifications of the embodiment will be described. However, the present invention is not limited by the embodiment.

[I] Basic concept of the embodiment First, the basic concept of the embodiment will be described. Embodiments generally relate to a fire detection apparatus for detecting and announcing a fire in a monitored area.

Here, the "fire detection device" is a device that optically detects and reports a fire in the monitored area, and is a concept that includes, for example, an optical fire detector and a fire alarm. . A "monitored area" is an area to be monitored, and is a concept including, for example, an area inside a building, an area outside the building, and the like. In addition, although the specific structure and type of "building" is arbitrary, for example, the concept includes detached houses, collective housing such as apartments and condominiums, office buildings, event facilities, commercial facilities, public facilities, etc. is. In addition, "notify" is a concept including, for example, outputting predetermined information to an external device, displaying or outputting predetermined information via output means (display means or audio output means), etc. be. In the following embodiments, a case where the "fire detection device" is an "optical fire sensor" and the "monitored area" is an "internal area of an office building" will be described.

[II] Specific contents of the embodiment Next, specific contents of the embodiment will be described.

(Constitution)
First, the configuration of the fire detection device according to the embodiment will be described. FIG. 1 is a side view showing how the fire detection device according to the embodiment is mounted. FIG. 2 is a bottom view showing the fire detection device with a mounting base, which will be described later, removed. 3 is a cross-sectional view taken along line AA of FIG. 2. FIG. In the following description, the X direction in FIG. 1 is the horizontal direction of the fire detection device (+X direction is the left direction of the fire detection device, -X direction is the right direction of the fire detection device), and the Y direction in FIG. 2 is the fire detection device. The front and back direction (+Y direction is the front direction of the fire detection device, -Y direction is the rear direction of the fire detection device), the Z direction in FIG. The direction is referred to as the downward direction of the fire detector). Further, with reference to the center position of the detection space described later in FIG. 3, the direction away from the detection space described later will be referred to as "outside", and the direction approaching the detection space described later will be referred to as "inside".

The fire detection device 1 is a device that detects and reports a detection target (for example, smoke) contained in gas. This fire detection device 1 is installed indoors in a building on an installation surface 2 on the lower surface of the ceiling of the building. As shown in FIGS. It has an inflow space 40 , an insect screen 50 , a detection space 60 , a detection section cover 70 , a detection section main body 80 , a terminal board 90 and a substrate 100 .

(Configuration - Mounting base)
Returning to FIG. 1 , the mounting base 10 is mounting means for mounting the outer cover 20 on the installation surface 2 . The mounting base 10 is configured using, for example, a known mounting base for a fire detection device (for example, a substantially plate-shaped mounting base made of resin) or the like, and as shown in FIG. It is fixed with a fixture or the like.

(Configuration - outer cover)
The outer cover 20 is a cover that covers the inner cover 30 , the inflow space 40 , the insect screen 50 , the detection space 60 , the detection section cover 70 , the detection section main body 80 , the terminal board 90 and the substrate 100 . The outer cover 20 is made of, for example, a light-shielding resin material. As shown in FIGS. 24.

Out of these, the outer cover main body 21 is the basic structure of the outer cover 20 . The outer cover main body 21 is formed of, for example, a substantially hollow columnar body whose upper and lower surfaces are open, and as shown in FIG. and fixed to the mounting base 10 by a fitting structure (or fixture) or the like.

Also, the top surface portion 22 is a partitioning means for partitioning the inflow space 40 . The top surface portion 22 is formed of, for example, a substantially circular plate-like body, and is provided substantially horizontally below the outer cover main body 21 as shown in FIGS. 1 to 3 . Further, as shown in FIG. 2, the top surface portion 22 is provided with a display hole 22a. The display hole 22a is a through hole for guiding light emitted from a display unit, which will be described later, to the outside of the fire detection device 1 through the light guide 104a and the display hole 22a shown in FIG.

Further, the first rib portion 23 is partitioning means for partitioning the inflow space 40 . The first rib portion 23 is formed of a substantially plate-like body and provided vertically between the outer cover main body 21 and the top surface portion 22. Specifically, as shown in FIGS. , a plurality of them are provided radially from the vicinity of the center of the outer cover 20 and are connected to the outer cover main body 21 and the top surface portion 22 .

Further, the second rib portion 24 is partitioning means for partitioning the inflow space 40 . The second rib portion 24 is formed of a substantially plate-like body, and is provided vertically between the outer cover main body 21 and the top surface portion 22. Specifically, as shown in FIGS. In addition, it is provided between the inner ends of adjacent first rib portions 23 and connected to the outer cover main body 21 and the top surface portion 22 .

(Configuration - inflow space)
Returning to FIG. 1 , the inflow space 40 is a space for causing the gas outside the fire detection device 1 to flow into the fire detection device 1 . A plurality of inflow spaces 40 are formed inside the outer cover 20. Specifically, as shown in FIGS. , the second rib portion 24 , and the inner cover 30 form an inflow space 40 .

(Configuration - inner cover)
The inner cover 30 is a cover that covers the detection space 60 , the detection section cover 70 , the detection section main body 80 , and the substrate 100 , and also serves as partitioning means for partitioning the inflow space 40 . The inner cover 30 is, for example, a substantially hollow cylindrical body with an open upper surface, and is made of a light-shielding resin material. As shown in FIG. 30 is provided so as to face the top surface portion 22 of the outer cover 20 with the inflow space 40 interposed therebetween. Further, as shown in FIG. 3, a first opening 30a is formed in the lower side portion of the inner cover 30. As shown in FIG. The first opening 30a is an opening for sending the gas that has flowed into the inflow space 40 to the detection space 60. As shown in FIG. provided in the vicinity.

(configuration - detection space)
The detection space 60 is a space for detecting a detection target, and as shown in FIG. is formed as

(Construction - detector cover)
The detection unit cover 70 is partitioning means for partitioning the detection space 60 and is incident suppressing means for suppressing disturbance light from entering the detection space 60 . The detector cover 70 is a substantially hollow columnar body with an open upper surface, and is made of a light-blocking resin material. Moreover, as shown in FIG. 3, the detection section cover 70 is located inside the inner cover 30 so that the lower side portion of the detection section cover 70 extends from the top of the outer cover 20 via the first opening 30a and the inflow space 40 . It is arranged so as to face the surface portion 22 and is fixed to the detection portion main body 80 . Further, as shown in FIG. 3, a second opening 70a is formed in the lower side portion of the detection section cover 70. As shown in FIG. The second opening 70a is an opening for allowing the gas sent from the first opening 30a to flow into the detection space 60. As shown in FIG. It is provided in a portion corresponding to one opening 30a. It should be noted that the detection section cover 70 corresponds to the "cover section" in the claims.

(Composition - insect screen)
The insect net 50 is a net for preventing insects outside the fire detection device 1 from entering the detection space 60 . The insect screen 50 is constructed using a mesh-like circular net, and is attached to the detection section cover 70 as shown in FIG.

(Construction - detector body)
The detector main body 80 is mounting means for mounting the detector cover 70 , and is incident suppressing means for suppressing disturbance light from entering the detection space 60 . The detector main body 80 is a thick plate-shaped body (for example, a substantially circular plate-shaped body) made of, for example, a light-shielding resin material, and is closer to the substrate 100 than the detector cover 70 ( Specifically, as shown in FIG. 3, it is arranged so as to cover the upper surface of the detection unit cover 70, and is fixed to the substrate 100 by a fixture or the like. It is The details of the configuration of the detection unit main body 80 will be described later. Also, the detection unit main body 80 corresponds to the "base unit" in the scope of claims.

(Configuration - terminal board)
Returning to FIG. 3 , the terminal board 90 is housing means for housing the inner cover 30 , the detection section cover 70 , the detection section main body 80 , and the board 100 . The terminal board 90 has a substantially hollow columnar shape with an open lower surface, and is made of, for example, a light-shielding resin material. 3, the terminal board 90 is provided so as to cover the inner cover 30, the detection section cover 70, the detection section main body 80, and the substrate 100 from above, and has a fitting structure with respect to the outer cover 20. etc., and is fixed to the mounting base 10 by a fixture or the like through a first mounting hole (not shown) formed in the mounting member 91 .

(Configuration - substrate)
The substrate 100 is mounting means on which various electric circuits (not shown) are mounted. The board 100 is configured using, for example, a known flat circuit board or the like, and as shown in FIG. It is arranged substantially horizontally and fixed to the terminal board 90 by a fixture through a mounting hole (not shown) formed in the terminal board 90 and a second mounting hole (not shown) formed in the mounting member 91. there is

Further, on the substrate 100, in addition to mounting components C (for example, known electrical components) shown in FIG. 2 A light-emitting part, a light-receiving part, a display part, a communication part, a power supply part, a control part, and a storage part are mounted (all not shown).

(Configuration - substrate - first light emitting part, second light emitting part, light receiving part)
Among these, the first light emitting section is a first light emitting means for irradiating detection light (hereinafter referred to as "first detection light") into the detection space 60, and is, for example, a known light emitting element (an example of which is an infrared LED). is configured using Further, the second light emitting unit is second light emitting means for irradiating the detection space 60 with detection light having a wavelength different from that of the first detection light (hereinafter referred to as "second detection light"). (Blue LED etc. as an example) is used. Further, the light receiving unit receives scattered light due to smoke of the first detection light emitted from the first light emitting unit, outputs a first light receiving signal according to the received scattered light, and emits light from the second light emitting unit. light receiving means for receiving the scattered light of the second detection light from the smoke and outputting a second light receiving signal corresponding to the received scattered light, for example, using a known light receiving element (such as a photodiode as an example) It is configured. In addition, the method of installing the first light emitting unit, the second light emitting unit, and the light receiving unit is arbitrary, but in the embodiment, the first detection light emitted from the first light emitting unit or the second light emitting unit or the second It is installed so that the detected light can be prevented from directly entering the light receiving section through various prism lens sections described later. For example, as shown in FIG. 4B, which will be described later, the optical axis L1 of the first light emitting portion (hereinafter referred to as "first light emitting side optical axis L1") and the optical axis L3 of the light receiving portion (hereinafter referred to as "light receiving side The first light emitting unit and the light receiving unit are installed at a position where the angle with the optical axis L3” is about 135°. Further, the second light emitting unit and the light receiving unit are arranged at a position where the angle between the optical axis L2 of the second light emitting unit (hereinafter referred to as "second light emitting side optical axis L2") and the light receiving side optical axis L3 is about 90°. is installed. The "first light emitting section", the "second light emitting section", and the "light receiving section" described above correspond to the "detector" in the claims.

(Configuration - board - display part, communication part, power supply part)
In addition, the display unit emits light (hereinafter referred to as “display light”) toward the outside of the fire detection device 1 to display predetermined information (for example, information indicating whether or not a fire has been detected). This is display means, and is configured using, for example, known display means (LED, etc.). The method of projecting light from the display unit is arbitrary, but for example, insertion holes (not shown) provided in each of the detection unit cover 70, the detection unit main body 80, and the inner cover 30, and an outer cover described later. 20 through a light guide 104a inserted into the display hole 22a of the display unit 20, and directing the display light from the display unit toward the outside of the fire detection device 1 to project the light. Also, the communication unit is communication means for communicating with an external device (for example, a receiver, etc.). The power supply unit is power supply means for supplying electric power supplied from a commercial power supply or a battery (not shown) to each unit of the fire detection apparatus 1 .

(Configuration - substrate - control unit, storage unit)
Also, the control unit is control means for controlling the fire detection device 1 . Specifically, this control unit includes a CPU, various programs interpreted and executed on the CPU (including a basic control program such as an OS, and an application program that is started on the OS and realizes a specific function), programs, and It is a computer configured with an internal memory such as a RAM for storing various data. The storage unit is storage means for storing programs and various data necessary for the operation of the fire detection device 1 . This storage unit is configured using a rewritable recording medium, and can use, for example, a non-volatile recording medium such as a flash memory.

(Structure - details of the structure of the main body of the detection unit)
Next, the details of the configuration of the detector main body 80 will be described. 4A and 4B are diagrams showing the detection unit main body 80, where (a) is a plan view and (b) is a bottom view. In FIG. 4B, the first light-emitting side optical axis L1, the second light-emitting side optical axis L2, and the light-receiving side optical axis L3 are indicated by imaginary lines. However, the detection unit main body 80 can be manufactured with any shape, method, and material, unless otherwise specified.

In the embodiment, as shown in FIG. 4, the detector main body 80 is provided with a first prism lens portion 81a, a second prism lens portion 81b, a third prism lens portion 81c, and a chamber portion 82. .

(Structure-details of structure of main body of detection unit-first prism lens unit, second prism lens unit, third prism lens unit)
The first prism lens section 81a is for changing the direction of the first detection light from the first light emitting section so that the first detection light enters the detection space 60 (specifically, the first The direction of the detection light is changed so as to be substantially parallel to the side surface of the detection unit main body 80 on the side of the detection space 60). The first prism lens portion 81a is configured using, for example, a known prism lens (the same applies to the second prism lens portion 81b and the third prism lens portion 81c), and as shown in FIG. , are provided in a first chamber portion 83 which will be described later. The second prism lens portion 81b is for changing the direction of the second detection light from the second light emitting portion so that the second detection light is incident on the detection space 60, as shown in FIG. , is provided in a second chamber portion 84 to be described later. The third prism lens portion 81c is for changing the direction of the scattered light received from the detection space 60 so that the scattered light enters the light receiving portion. It is provided in the third chamber part 85 .

(Structure-details of structure of main body of detection unit-chamber)
Returning to FIG. 3, the chamber section 82 is for supporting the first prism lens section 81a, the second prism lens section 81b, the third prism lens section 81c, and the detection section cover . As shown in FIGS. 3 and 4, the chamber section 82 is provided on the lower surface of the detection section main body 80, and includes a first chamber section 83, a second chamber section 84, and a third chamber section 85. .

Among these, the first chamber portion 83 supports a part of the first prism lens portion 81a and the detection portion cover 70, and is formed of, for example, a hollow body having an open top surface and a bottom surface. , the second chamber portion 84 and the third chamber portion 85) are provided at positions corresponding to the first light emitting portions, as shown in FIG. Further, as shown in FIG. 4, the first chamber portion 83 includes a first incident port 83a for causing the first detection light emitted from the first light emitting portion to enter the first prism lens portion 81a, a first A first entrance 83b is provided for causing the first detection light whose direction has been changed by the prism lens portion 81a to enter the detection space 60. As shown in FIG.

The second chamber portion 84 supports the second prism lens portion 81b and another part of the detection portion cover 70, and is provided at a position corresponding to the second light emitting portion as shown in FIG. ing. Further, as shown in FIG. 4, the second chamber section 84 includes a second entrance 84a for allowing the second detection light emitted from the second light emitting section to enter the second prism lens section 81b, a second A second entrance 84b is provided for allowing the second detection light whose direction is changed by the prism lens portion 81b to enter the detection space 60 .

The third chamber portion 85 supports the third prism lens portion 81c and another part of the detection portion cover 70, and is provided at a position corresponding to the light receiving portion as shown in FIG. . In addition, as shown in FIG. 4, the third chamber section 85 has a third entrance 85a for allowing the scattered light from the detection space 60 to enter the third prism lens section 81c, and the third prism lens section 81c. A third entrance 85b is provided for causing the scattered light whose direction has been changed to enter the light receiving section.

Although the method of forming the chamber portion 82 is arbitrary, for example, the chamber portion 82 and the detection portion main body 80 may be integrally formed by injection molding a resin material having a light blocking effect.

The first prism lens portion 81a, the second prism lens portion 81b, the third prism lens portion 81c, and the detection portion cover 70 may be attached by any method. After the lens portion 81c is vertically inserted into each of the first chamber portion 83 to the third chamber portion 85, a part of the upper portion of the detection portion cover 70 is fitted into the first chamber portion 83 to the third chamber portion 85. It corresponds to attaching by

(Configuration - containment structure)
Next, the accommodation structure of the detection unit main body 80 will be described. The features of the accommodation structure for improving the accommodation of the component C mounted on the substrate 100 (indicated by imaginary lines in FIG. 4A, hereinafter simply referred to as "component C") are described in the embodiment. Now, it will be as shown below.

That is, as shown in FIG. 4A, the detection unit body 80 includes a first substrate-side recess 86a, a second substrate-side recess 86b, a third substrate-side recess 86c, a fourth substrate-side recess 86d, and a fifth substrate-side recess 86d. A side recess 86e is provided.

The first board side recess 86a, the second board side recess 86b, the third board side recess 86c, the fourth board side recess 86d, and the fifth board side recess 86e are recesses for accommodating the component C. These first substrate-side recessed portion 86a, second substrate-side recessed portion 86b, third substrate-side recessed portion 86c, fourth substrate-side recessed portion 86d, and fifth substrate-side recessed portion 86e are part of the detection portion main body 80 on the substrate 100 side (predetermined part (in FIG. 3, the upper part of the detection unit main body 80)) is formed into a concave shape. Specifically, as shown in FIG. 4A, the first substrate-side concave portion 86a is formed in a portion corresponding to the first chamber portion 83 or a portion in the vicinity thereof in the portion of the detection portion main body 80 on the substrate 100 side. It is configured by forming a portion facing a portion of the component C in a concave shape. Further, the second substrate-side concave portion 86b is a portion corresponding to or near the second chamber portion 84 in the portion of the detection portion main body 80 on the substrate 100 side, and faces another portion of the component C. It is constructed by forming a part into a concave shape. Further, the third substrate-side concave portion 86c is a portion corresponding to or near the third chamber portion 85 in the portion of the detection portion main body 80 on the substrate 100 side, and faces another portion of the component C. It is constructed by forming a part into a concave shape. Further, the fourth substrate-side concave portion 86d is the outer edge portion of the portion other than the chamber portion 82 and the vicinity thereof in the portion of the detection portion main body 80 on the substrate 100 side, and faces another portion of the component C. It is constructed by forming a part into a concave shape. In addition, the fifth substrate side recess 86e includes the first substrate side recess 86a, the second substrate side recess 86b, and the fourth substrate side recess 86a and the second substrate side recess 86b in the portion other than the chamber portion 82 in the portion of the detection portion main body 80 on the substrate 100 side. A portion adjacent to the recess 86d and facing another portion of the component C is formed in a recessed shape.

Also, the sizes of the first substrate-side recessed portion 86a, the second substrate-side recessed portion 86b, the third substrate-side recessed portion 86c, the fourth substrate-side recessed portion 86d, and the fifth substrate-side recessed portion 86e are arbitrary. , the size is set so that the component C facing each recess can be accommodated. Specifically, as shown in FIG. 4A, the size of the planar shape of each recess is as follows: fourth substrate side recess 86d, fifth substrate side recess 86e, second substrate side recess 86b, third substrate side recess 86b, The side recessed portion 86c and the first substrate side recessed portion 86a are set larger in this order. However, it is not limited to this, and may be changed according to the size and number of components C, for example. Moreover, since it is desirable to make the depth of each recess as shallow as possible so that the parts C facing each other can be accommodated, the depth of each recess may be set individually based on, for example, experimental results. Alternatively, from the viewpoint of manufacturability of the detection unit main body 80, the depth may be set to be uniform.

The first substrate-side recess 86a, the second substrate-side recess 86b, the third substrate-side recess 86c, the fourth substrate-side recess 86d, and the fifth substrate-side recess 86e may be formed by any method. A first substrate side recess 86a, a second substrate side recess 86b, a third substrate side recess 86c, a fourth substrate side recess 86d, a fifth substrate side recess 86e, and a detection It may be integrally formed with the main body 80 . Alternatively, it may be formed by performing notch processing on the detection unit body 80 formed by injection molding a resin material having a light blocking effect (a first detection space side concave portion 87a and a second detection space side concave portion 87a, which will be described later). The method of forming the space-side concave portion 87b and the third detection space-side concave portion 87c is substantially the same).

With such an accommodation structure, the components C are accommodated inside the first board side recess 86a, the second board side recess 86b, the third board side recess 86c, the fourth board side recess 86d, and the fifth board side recess 86e. be able to. Therefore, it becomes easier to secure a space for mounting the component C between the detection unit main body 80 and the substrate 100, so that the capacity to accommodate the component C can be improved. In particular, a space for mounting the component C can be formed in the portion of the detection unit main body 80 on the board 100 side, which makes it easier to secure the space. Also, the first substrate side recess 86a, the second substrate side recess 86b, the third substrate side recess 86c, the fourth substrate side recess 86d, and the fifth substrate side recess 86e are the portions of the detection unit main body 80 on the substrate 100 side. Since it is provided in a portion facing the component C, it is possible to effectively form a space for mounting the component C and to make the space compact.

(Construction-reflection suppression structure)
Next, the anti-reflection structure of the detector main body 80 will be described. The features of the reflection suppression structure for suppressing reflection of the first detection light or the second detection light incident on the detection section main body 80 toward the light receiving section are as follows in the embodiment.

That is, as shown in FIG. 4B, the detection unit body 80 is provided with a first detection space side recess 87a, a second detection space side recess 87b, and a third detection space side recess 87c.

The first detection space side recessed portion 87a, the second detection space side recessed portion 87b, and the third detection space side recessed portion 87c reflect the first detection light or the second detection light incident on the detection portion main body 80 toward the light receiving portion. It is a concave portion for suppressing that. Here, "suppressing the reflection of the first detection light or the second detection light incident on the detection unit main body 80 toward the light receiving unit" means, for example, the first detection light or the second detection light incident on the detection unit main body 80 or Reflecting the second detection light in a direction other than the direction toward the light receiving section, and reflecting the first detection light or the second detection light incident on the detection section main body 80 to a portion of the first detection space side concave portion 87a or the like. It corresponds to reflecting such that it is incident toward the .

Further, the first detection space side recessed portion 87a, the second detection space side recessed portion 87b, and the third detection space side recessed portion 87c are the portions of the detection portion main body 80 on the side of the detection space 60 (predetermined portions; ) of the main body 80 is formed in a concave shape. Specifically, as shown in FIG. 4B, the first detection space side concave portion 87a is located at the first entrance 83b of the first chamber portion 83 in the portion of the detection portion main body 80 on the detection space 60 side. It is configured by forming the neighboring portion in a concave shape. The second detection space side recess 87b is a portion of the detection space 60 side of the detection unit main body 80 that is in the vicinity of the second entrance 84b of the second chamber portion 84 and adjacent to the first detection space side recess 87a. is formed in a concave shape. The third detection space side recess 87c is a portion of the detection space 60 side of the detection unit main body 80 that is in the vicinity of the third entrance 85a of the third chamber portion 85 and adjacent to the second detection space side recess 87b. is formed in a concave shape.

The first detection space side recessed portion 87a, the second detection space side recessed portion 87b, and the third detection space side recessed portion 87c may be installed in any manner. The second detection space side concave portion 87b and the third detection space side concave portion 87c are arranged at positions where the first detection light or the second detection light can enter. Specifically, when viewed from the plane direction, in the portion of the detecting portion main body 80 on the detection space 60 side, the portion overlapping the first light emitting side optical axis L1, the second light emitting side optical axis L2, or the light receiving side optical axis L3. are placed. For example, as shown in FIG. 4B, in a portion of the detection space 60 side of the detection unit main body 80 that overlaps the first light-emitting side optical axis L1 and the light-receiving side optical axis L3 when viewed from the plane direction, a second 1 detection space side concave portion 87a may be arranged. In addition, when viewed from the plane direction, of the detection space 60 side portion of the detection unit main body 80, the first light emitting side optical axis L1, the second light emitting side optical axis L2, and the light receiving side optical axis L3 2 detection space side concave portion 87b may be arranged. In addition, when viewed from the plane direction, a third A detection space side recess 87c may be arranged.

Further, although the sizes of the first detection space side recess 87a, the second detection space side recess 87b, and the third detection space side recess 87c are arbitrary, in the embodiment, the detection portion main body 80 (specifically, , the first detection space side recessed portion 87a, the second detection space side recessed portion 87b, or the third detection space side recessed portion 87c) is suppressed from being reflected toward the light receiving portion. It is set to a size that makes it possible. Specifically, since it is desirable that the size of the planar shape of each concave portion is as small as possible to suppress reflection of the first detection light or the second detection light toward the light receiving portion, for example, experimental results (In FIG. 4B, the second detection space side recessed portion 87b, the first detection space side recessed portion 87a, and the third detection space side recessed portion 87c are set larger in this order.) . In addition, since it is desirable to make the depth of each concave portion as shallow as possible to suppress reflection of the first detection light or the second detection light toward the light receiving portion, for example, based on experimental results, etc. May be set.

With such a reflection suppressing structure, the first detection light or the second detection light incident on the detection unit main body 80 is controlled by the first detection space side recessed portion 87a, the second detection space side recessed portion 87b, and the third detection space side recessed portion 87c. can be suppressed from being reflected toward the light receiving section. Therefore, it is possible to prevent the amount of light received by the light receiving unit from becoming excessive even though the detection target is not detected, and the detection accuracy of the fire detection device 1 can be maintained. In particular, the first detection light or the second detection light incident on the detection space 60 side surface of the detection unit main body 80 can be suppressed from being reflected toward the light receiving unit, further preventing the amount of light received by the light receiving unit from becoming excessive. can be avoided.

(About the action of the fire detection device)
Next, the operation of the fire detection device 1 configured in this manner will be described.

That is, for example, when assembling the fire detection device 1, the first substrate-side recess 86a, the second substrate-side recess 86b, the third substrate-side recess 86c, the fourth substrate-side recess 86d, and the fifth substrate-side recess 86d are mounted on the detection unit main body 80. By providing the side recesses 86e, components can be placed inside the first board side recesses 86a, the second board side recesses 86b, the third board side recesses 86c, the fourth board side recesses 86d, and the fifth board side recesses 86e. Since C is accommodated, component C can be reliably accommodated.

Further, for example, in a state where the fire detection device 1 is attached to the installation surface 2, the first detection light or the second detection light emitted from the first light emitting unit or the second light emitting unit is emitted from the first detection space side concave portion 87a, When incident on the second detection space side recessed portion 87b or the third detection space side recessed portion 87c, the incident first detection space side recessed portion 87a, the second detection space side recessed portion 87b or the third detection space side recessed portion 87c. Since the detection light or the second detection light is suppressed from being reflected toward the light receiving section, it is possible to avoid an excessive amount of light received by the light receiving section even though the detection target is not detected.

(Test results)
Next, test results of the light receiving test for the fire detection device 1 will be described. Here, the “light-receiving test” refers to a state in which there is no detection target in the detection space 60, and the light-receiving unit is tested when the first detection light or the second detection light is emitted from the first light-emitting unit or the second light-emitting unit. This test measures the amount of light received.

Moreover, although the test method of this light reception test is arbitrary, it is performed as follows, for example. That is, first, a fire detection device including any one of a first detection unit main body to a fourth detection unit main body described below is installed in a place where there is no detection target. Next, the first detection light is emitted only from the first light emitting section for 60 seconds, and the amount of light received by the light receiving section at this time is measured. Then, the average value of the amount of received light measured for 60 seconds is specified as the amount of received light to be measured.

Here, the test objects used in the light receiving test are classified into four types from the first detection unit main body to the fourth detection unit main body. Among these, the first detection portion main body is the detection portion main body 80 in which a concave portion is not formed in the detection space 60 side portion of the detection portion main body 80 . The second detection section main body is the detection section main body 80 in which a third detection space side concave portion 87c is formed in a portion of the detection section main body 80 on the detection space 60 side. The third detection section main body is the detection section main body 80 in which a second detection space side concave portion 87b and a third detection space side concave portion 87c are formed in the detection space 60 side portion of the detection portion main body 80 . In addition, in the fourth detection section main body, a first detection space side recess 87a, a second detection space side recess 87b, and a third detection space side recess 87c are formed in the detection space 60 side portion of the detection section main body 80. This is the detection unit main body 80 .

Next, the details of the test results of the light receiving test will be described. FIG. 5 is a diagram showing test results of the light receiving test. As shown in FIG. 5, the amount of light received by the main body of the first detection unit was 30 (A/D conversion value). On the other hand, the amount of light received by the second to fourth detection unit main bodies was less than 30 (A/D conversion value), which was smaller than the amount of light received by the first detection unit main body. In particular, the amount of light received by the main body of the fourth detection portion was about half the amount of light received by the main body of the first detection portion because the amount of light received (A/D conversion value) was 15.

From the test results shown in FIG. 5, it can be seen that the first detection light incident on the detection unit main body 80 can be suppressed from being reflected toward the light receiving unit. The effectiveness of providing at least one of the concave portion 87b and the third detection space side concave portion 87c was confirmed.

(Effect of Embodiment)
As described above, according to the embodiment, the detection unit cover 70 that covers the outer circumference of the detection space 60 and the detection unit cover 70 is an incident suppressing means for suppressing the incidence of ambient light into the detection space 60 . Since the incident suppressing means having the detection unit main body 80 provided on the substrate 100 side and the recess formed by forming a predetermined portion of the detection unit main body 80 in a concave shape are provided, for example, the first substrate side recess 86a of the recesses , the second substrate-side recess 86b, the third substrate-side recess 86c, the fourth substrate-side recess 86d, and the fifth substrate-side recess 86e. Therefore, it becomes easier to secure a space for mounting the component C between the detection unit main body 80 and the substrate 100, so that the capacity to accommodate the component C can be improved. Further, for example, one detection space side concave portion, the second detection space side concave portion 87b, and the third detection space side concave portion 87c among the concave portions prevent the detection light incident on the detection portion main body 80 from being reflected toward the light receiving portion. can be suppressed. Therefore, it is possible to prevent the amount of light received by the light receiving unit from becoming excessive even though the detection target is not detected, and the detection accuracy of the fire detection device 1 can be maintained.

Further, the predetermined portion includes a portion of the detection unit main body 80 on the substrate 100 side, and includes a first substrate-side recess 86a, a second substrate-side recess 86b, a third substrate-side recess 86c, a fourth substrate-side recess 86d, and the fifth substrate-side recess 86e are formed so that at least a part of the component C can be accommodated in these recesses, so that a space for mounting the component C can be formed in the portion of the detection unit main body 80 on the substrate 100 side. , it becomes easier to secure the space.

In addition, since the predetermined portion includes the portion facing the component C in the portion on the substrate 100 side, the space for mounting the component C can be effectively formed, and the space can be made compact.

Further, the predetermined portion includes the detection space 60 side portion of the detection portion main body 80, and detects the first detection space side recessed portion 87a, the second detection space side recessed portion 87b, and the third detection space side recessed portion 87c. Since the detection light incident on the part on the space 60 side can be suppressed from being reflected toward the light receiving section, the detection light incident on the side surface of the detection section main body 80 on the detection space 60 side is reflected toward the light receiving section. It is possible to prevent the amount of light received by the light-receiving section from becoming excessive.

[III] Modifications to the Embodiments Although the embodiments according to the present invention have been described above, specific configurations and means of the present invention are within the scope of the technical ideas of each invention described in the claims. In can be optionally modified and improved. Such modifications will be described below.

(Problem to be solved and effect of invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the contents described above, and may differ depending on the details of the implementation environment and configuration of the invention. or only part of the effects described above.

(About fire detection device)
Although the fire detection device 1 has the inner cover 30 in the above embodiment, the present invention is not limited to this, and the inner cover 30 may be omitted, for example.

(About the detector body)
In addition, in the above-described embodiment, the detector main body 80 is provided with the housing structure and the antireflection structure. may

(About substrate)
In the above embodiment, the substrate 100 is mounted with the first light emitting unit and the second light emitting unit. However, the present invention is not limited to this. May be omitted. In this case, for example, only one or only two of the first detection space side recess 87a, the second detection space side recess 87b, or the third detection space side recess 87c may be omitted.

(Containment structure)
In the above embodiment, the number of recesses provided in the substrate 100 side portion of the detection unit main body 80 is five, but the number is not limited to this, and may be less than five, or , may be six or more.

(Regarding antireflection structure)
In the above embodiment, the number of recesses provided in the detection space side portion of the detection unit main body 80 is three, but the number is not limited to this, and the number may be less than three, or , may be four or more.

(Appendix)
The fire detection device of Supplementary Note 1 is a fire detection device for detecting a fire in a monitoring area, and includes a detection space for detecting a detection target, and irradiation and reception of detection light in the detection space. a substrate on which components including detection means for detecting a detection target are mounted; and a cover portion, which is an incident suppression means for suppressing disturbance light from entering the detection space and covers the outer periphery of the detection space. an incident suppressing means having a base portion which is provided closer to the substrate than the cover portion and which covers the substrate;

Further, the fire detection device of appendix 2 is the fire detection device of appendix 1, wherein the predetermined portion includes a portion of the base portion on the side of the substrate, and the concave portion is mounted on the substrate. At least part of the component is formed to be accommodated in the recess.

Further, the fire detection device according to Supplementary Note 3 is the fire detection device according to Supplementary Note 2, wherein the predetermined portion includes a portion facing the component among the portions on the board side.

Further, the fire detection device of Appendix 4 is the fire detection device according to any one of Appendixes 1 to 3, wherein the predetermined portion includes a portion of the base portion on the detection space side, and the concave portion is formed so as to be able to suppress reflection of the detection light incident on the detection space side portion toward the detection means.

(Effect of Supplementary Note)
According to the fire detection device described in Supplementary Note 1, the incident suppression means for suppressing the incidence of ambient light into the detection space includes the cover portion that covers the outer circumference of the detection space, and the cover portion provided closer to the substrate than the cover portion. Since the incident suppressing means having the base portion which is formed on the base portion and the concave portion formed by forming a predetermined portion of the base portion in a concave shape are provided, for example, components can be accommodated inside the concave portion. Therefore, since it becomes easy to secure a space for mounting components between the base portion and the substrate, it is possible to improve the accommodation of the components. Further, for example, the concave portion can suppress reflection of the detection light incident on the base portion toward the detecting means. Therefore, it is possible to prevent the amount of light received by the detection means from becoming excessive even though the detection target is not detected, and it is possible to maintain the detection accuracy of the fire detection device.

According to the fire detection device described in Supplementary Note 2, the predetermined portion includes the substrate-side portion of the portion of the base portion, and the recess is formed so that at least part of the component can be accommodated in the recess. A space for mounting components can be formed in the portion on the substrate side of the substrate, and the space can be secured more easily.

According to the fire detection device described in appendix 3, since the predetermined portion includes the portion facing the component in the portion on the board side, the space for mounting the component can be effectively formed, and the space can be made compact. becomes possible.

According to the fire detection device described in appendix 4, the predetermined portion includes the detection space side portion of the base portion, and the detection light incident on the detection space side portion of the concave portion is reflected toward the detection means. Since it is formed so as to be able to suppress the amount of light received by the detection means, it is possible to suppress the reflection of the detection light incident on the detection space side of the base portion toward the detection means, thereby further avoiding an excessive amount of light received by the detection means. be able to.

Reference Signs List 1 fire detection device 2 installation surface 10 mounting base 20 outer cover 21 outer cover body 22 top surface 22a display hole 23 first rib 24 second rib 30 inner cover 30a first opening 40 inflow space 50 insect screen 60 detection space 70 detector cover 70a second opening 80 detector main body 81a first prism lens 81b second prism lens 81c third prism lens 82 chamber 83 first chamber 83a first inlet 83b first inlet 84 Second Chamber Part 84a Second Entrance 84b Second Entrance 85 Third Chamber Part 85a Third Entrance 85b Third Entrance 86a First Substrate Side Recess 86b Second Substrate Side Recess 86c Third Substrate Side Recess 86d Fourth Board-side recess 86e Fifth board-side recess 87a First detection space-side recess 87b Second detection space-side recess 87c Third detection space-side recess 90 Terminal board 91 Mounting member 100 Board 104a Light guide C Part L1 First light-emitting side optical axis L2 Second light-emitting side optical axis L3 Light-receiving side optical axis

Claims (4)

A fire detection device for detecting fire in a monitored area, comprising:
a detection space for detecting a detection target;
a substrate on which components are mounted, including detection means for detecting the detection target by irradiating and receiving detection light in the detection space;
An incident suppressing means for suppressing ambient light from entering the detection space, comprising: a cover portion covering an outer periphery of the detection space; and a base portion provided closer to the substrate than the cover portion. an incident suppression means having a base covering the substrate;
a concave portion in which a predetermined portion of the base portion is formed in a concave shape ;
The detection means includes a first light emitting section that emits first detection light, which is the detection light, and a second light emission section that emits second detection light, which is the detection light having a wavelength different from that of the first detection light. , a light receiving unit that receives the first detection light and the second detection light,
The predetermined portion includes a portion on the detection space side of the portion of the base portion,
forming the concave portion so as to suppress reflection of the detection light incident on the detection space side portion toward the detection means;
The recess includes a first detection space-side recess located near the first light-emitting portion, a second detection space-side recess located near the second light-emitting portion, and a third recess located near the light-receiving portion. and a detection space side recess,
Any one of the first detection space side recess, the second detection space side recess, or the third detection space side recess when viewed from a direction substantially the same as the depth direction of the recess is the first light emitting portion. the first detection space side concave portion, the second detection space side concave portion, and the third detection space side concave portion so as to overlap the optical axis of the second light emitting portion and the optical axis of the light receiving portion. placed,
Fire detection device. arranging the first detection space side recess, the second detection space side recess, and the third detection space side recess adjacent to each other;
The depth of each of the first detection space side recess, the second detection space side recess, and the third detection space side recess is individually set according to the extent to which reflection of the detection light is suppressed,
A fire detection device according to claim 1. the predetermined portion includes a portion of the base portion that is closer to the substrate;
The recess is formed so that at least part of the component mounted on the substrate can be accommodated in the recess,
The fire detection device according to claim 1 or 2 . The predetermined portion includes a portion of the substrate-side portion that faces the component,
A fire detection device according to claim 3 .

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