Smoke detection device, detector, and detection system

Abstract

The present disclosure addresses the problem of providing a smoke detection device in which it is possible to easily adjust the smoke detection sensitivity. A smoke detection device (1) comprises: a substrate (10); a light-emitting unit (11); a light-receiving unit (12); a first optical member (111); and a second optical member (121). The light-emitting unit (11) is surface-mounted on a main surface (10A) side of the substrate (10). The light-receiving unit (12) is surface-mounted on the main surface (10A) side of the substrate (10). The first optical member (111) is provided on the light emission side of the light-emitting unit (11). The second optical member (121) is provided on the light entering side of the light-receiving unit (12). A void (Vd1) is present between the first optical member (111) and the second optical member (121).

Description

Smoke detection devices, detectors and detection systems

[0001] The present disclosure relates to a smoke detection device, a detector, and a detection system, and more particularly to a smoke detection device in which an emitter and a receiver are surface-mounted on a substrate, a detector including the smoke detection device, and a detection system including the detector.

[0002] Patent Document 1 describes a scattered radiation type optical smoke detector in which a light emitter and a light receiver that senses radiation from the light emitter are attached to a substrate. In this optical smoke detector, a measurement volume within a measurement chamber that is accessible to smoke particles is defined by the intersection volume of the light emission cone of the light emitter and the light reception cone of the receiver that can receive radiation scattered by the smoke particles. A low wall is provided between the light emitter and the receiver to prevent direct radiation from the light emitter to the receiver.

[0003] Special Publication No. 2021-522523

[0004] The following problem has been discovered from the background art. In the optical smoke detector of Patent Document 1, the smoke detection sensitivity is thought to vary depending on the proportion of the measurement volume in the measurement chamber. Therefore, it is conceivable to adjust the proportion of the measurement volume in the measurement chamber, and thus the smoke detection sensitivity, by changing the height of the bottom wall between the light emitter and the light receiver. However, it is not easy to adjust the smoke detection sensitivity using a single optical component such as the bottom wall.

[0005] An object of the present disclosure is to provide a smoke detection device, a detector, and a detection system that can facilitate adjustment of smoke detection sensitivity.

[0006] A smoke detection device according to one aspect of the present disclosure comprises a substrate, a light-emitting unit surface-mounted on a main surface side of the substrate, a light-receiving unit surface-mounted on the main surface side of the substrate, a first optical member provided on the light-emitting side of the light-emitting unit, and a second optical member provided on the light-receiving side of the light-receiving unit, and a gap exists between the first optical member and the second optical member.

[0007] A detector according to one aspect of the present disclosure comprises a housing having an opening and the smoke detection device, at least a portion of the smoke detection device being housed in the opening of the housing.

[0008] A detection system according to one aspect of the present disclosure includes the detector and a communication device that communicates with the detector.

[0009]

[0013] Fig. 1 is a conceptual diagram illustrating, in a line of sight parallel to a substrate, the positional relationship between a light-emitting unit and a first optical member and a second optical member and a light-receiving unit, as well as the directional relationship between an emission range indicating the range through which emitted light emitted from the light-emitting unit via the first optical member can pass and an incidence range indicating the range through which incident light incident on the light-receiving unit via the second optical member can pass, in a smoke detection device according to an embodiment of the present disclosure. Fig. 2 is a conceptual diagram illustrating the positional relationship and the directional relationship in a line of sight perpendicular to the substrate. Fig. 3A is a conceptual diagram illustrating the emission range and the incidence range when each of the first optical member and the second optical member is a refractive member, Fig. 3B is a conceptual diagram illustrating the emission range and the incidence range when each of the first optical member and the second optical member is a reflective member, and Fig. 3C is a conceptual diagram illustrating the emission range and the incidence range when each of the first optical member and the second optical member is a light-blocking member. Fig. 4A is a perspective view of the smoke detection device as viewed from the opposite side of the main surface of the substrate, and Fig. 4B is a perspective view of the smoke detection device as viewed from the main surface of the substrate. Fig. 5 is an exploded perspective view of the smoke detection device as viewed from the opposite side of the main surface of the substrate. Fig. 6 is an exploded perspective view of the smoke detection device as viewed from the main surface of the substrate. Fig. 7 is an exploded perspective view of a smoke detection device of a first modified example as viewed from the opposite side of the main surface of the substrate. Fig. 8 is an exploded perspective view of the smoke detection device of the first modified example as viewed from the main surface of the substrate. Fig. 9 is an exploded perspective view of a smoke detection device of a second modified example as viewed from the opposite side of the main surface of the substrate. Fig. 10 is an exploded perspective view of the smoke detection device of the second modified example as viewed from the main surface of the substrate. Fig. 11A is a perspective view showing a main part (first optical member, second optical member, and support member) of a smoke detection device of a third modified example as viewed from the main surface side of the substrate, Fig. 11B is a perspective view showing a main part of a smoke detection device of a fourth modified example as viewed from the main surface side of the substrate, Fig. 12A is a conceptual diagram conceptually showing a detector including the smoke detection device of the embodiment and a housing that houses a part of the smoke detection device of the embodiment, and Fig. 12B is a block diagram of a communication system including the same detector and a communication device.

[0010] (1) Overview First, an overview of the present disclosure will be described using Figures 1, 2, and 3A to 3C. Note that the arrangement of the light-emitting unit 11 and the light-receiving unit 12 is reversed between Figure 1 and Figures 3A to 3C (in other words, the viewpoint from which the smoke detection device 1 is viewed is reversed).

[0011] As shown in FIG. 1 , a smoke detection device 1 according to an embodiment of the present disclosure includes a substrate 10 , a light-emitting unit 11 , a light-receiving unit 12 , a first optical member 111 , and a second optical member 121 .

[0012] (1-1) Substrate The substrate 10 is a printed circuit board having a conductive pattern portion 15 (see FIGS. 6, 8, and 10; described later) printed on a main surface 10A.

[0013] (1-2) Light Emitting Unit, First Optical Member, and Emission Range The light emitting unit 11 includes a light emitting element, such as an LED (light-emitting diode).

[0014] The light emitting unit 11 of this embodiment is a surface-mounted light emitting module, and further includes a substrate on which light emitting elements are surface-mounted, and a lens provided on the surface of the substrate to cover the light emitting elements. The surface of the substrate constituting the light emitting unit 11 opposite to the surface on which the light emitting elements are surface-mounted is conductively bonded to the main surface 10A of the substrate 10, thereby surface-mounting the light emitting unit 11 on the substrate 10. The light emitting unit 11 receives a supply of power via a conductive pattern portion 15 (first conductive pattern portion 151: described below) formed on the substrate 10, and emits light according to the power.

[0015] 1 and 3A to 3C, the light-emitting unit 11 is surface-mounted on the main surface 10A side of the substrate 10. Therefore, the optical axis of the light-emitting unit 11 is perpendicular to the main surface 10A of the substrate 10, and the light-emitting unit 11 emits light that travels in a direction away from the main surface 10A within a certain range centered on a direction perpendicular to the main surface 10A of the substrate 10 (hereinafter referred to as the "normal direction").

[0016] 1 and 3A to 3C, the first optical member 111 emits light emitted from the light-emitting unit 11 in the normal direction to the main surface 10A of the substrate 10 toward an emission range Or1 having a cone shape with its apex located on the light emission side of the light-emitting unit 11 and its rotation axis tilted toward the second optical member 121 with respect to the normal direction to the main surface 10A of the substrate 10. The emission range Or1 is a range through which light (emitted light Og1) emitted from the light-emitting unit 11 via the first optical member 111 can pass.

[0017] (1-3) Light Receiving Unit, Second Optical Member, and Incident Range The light receiving unit 12 has a light receiving element, such as a photodiode (hereinafter referred to as "PD").

[0018] The light receiving unit 12 of this embodiment is a surface-mounted light receiving module, and further includes a substrate on which a light receiving element is surface-mounted, and a lens provided on the surface of the substrate so as to cover the light receiving element. The light receiving unit 12 is surface-mounted on the substrate 10 by electrically conductively bonding a surface of the substrate constituting the light receiving unit 12 opposite to the surface on which the light receiving element is surface-mounted to the main surface 10A of the substrate 10.

[0019] 1 and 3A to 3C, the light receiving unit 12 is surface-mounted on the main surface 10A side of the substrate 10. Therefore, the optical axis of the light receiving unit 12 is perpendicular to the main surface 10A, similar to the optical axis of the light emitting unit 11, and the light receiving unit 12 receives light that travels in a direction approaching the main surface 10A within a certain range centered on a direction perpendicular to the main surface 10A of the substrate 10 (normal direction).

[0020] 1 and 3A to 3C, the second optical member 121 allows light from an incident range Ir1, which is a cone shape with its apex on the light incident side of the light receiving unit 12 and whose rotation axis is inclined toward the first optical member 111 with respect to the normal direction of the main surface 10A of the substrate 10, to be incident on the light receiving unit 12. The incident range Ir1 is a range through which light incident on the light receiving unit 12 via the second optical member 121 (hereinafter referred to as "incident light") can pass.

[0021] The light receiving unit 12 receives light (scattered light Sc1) incident through the second optical member 121, and outputs an electrical signal corresponding to the scattered light Sc1 through a conductive pattern unit 15 (second conductive pattern unit 152: described later) formed on the substrate 10.

[0022] (1-4) Positional Relationship Between the First and Second Optical Members, and Gap As shown in FIG. 1, the first optical member 111 is provided on the light-emitting side of the light-emitting unit 11. The second optical member 121 is provided on the light-incident side of the light-receiving unit 12. A gap Vd1 exists between the first optical member 111 and the second optical member 121.

[0023] (1-4-1) Function of the First Optical Member The first optical member 111 is an optical member that emits at least a portion of the light emitted from the light-emitting unit 11 (see FIGS. 3A to 3C) into an emission range Or1 within the gap Vd1 and directs the light toward a detection region Da1 (described below), which is the region where the emission range Or1 intersects with the entrance range Ir1.

[0024] The first optical member 111 emits at least a portion of the light emitted from the light-emitting unit 11 (emitted light Og1) into the emission range Or1 within the gap Vd1 and toward the detection area Da1 by at least one of changing the path of the light emitted from the light-emitting unit 11 and blocking the light emitted from the light-emitting unit 11 that is directed outside the detection area Da1.

[0025] The path of light refers to at least one of the traveling direction and the spread of light. In this embodiment, the first optical member 111 changes the traveling direction and the spread of light emitted from the light-emitting unit 11. However, the first optical member 111 may change only the traveling direction of the light emitted from the light-emitting unit 11 without changing the spread of the light. Alternatively, the first optical member 111 may change only the spread of the light emitted from the light-emitting unit 11 without changing the traveling direction of the light.

[0026] Specifically, light is emitted from the light-emitting section 11 in the normal direction to the main surface 10A of the substrate 10, and the first optical member 111 changes the path of the emitted light to a direction oblique to the normal direction to the main surface 10A and emits it.

[0027] 1 , 3A, and 3B , the first optical member 111 emits at least a portion of the light (emitted light Og1) emitted by the light-emitting unit 11 toward the detection region Da1 in the gap Vd1. The first optical member 111 has a function (first optical path changing function) of changing the path of the light from the light-emitting unit 11, for example, by at least one of refraction (see FIGS. 1 and 3A) and reflection (see FIG. 3B). Note that the first optical path changing function may include at least one of a first light focusing function that focuses the light from the light-emitting unit 11 and a first light scattering function that diffuses the light from the light-emitting unit 11.

[0028] 3C , the first optical member 111 may have a function (first light-blocking function) of blocking all light from the light-emitting unit 11 except for a portion of the light traveling toward the detection area Da1. Alternatively, the first optical member 111 may have both the first optical path changing function and the first light-blocking function.

[0029] The first optical member 111 is, for example, a lens prism (described later) as shown in Figures 1 and 3A. However, the first optical member 111 may also include a refractive member (described later) other than a lens prism. In general, the first optical member 111 may include any one type of optical member selected from the group consisting of a refractive member, a reflective member (described later: see Figure 3B), and a light-blocking member (described later: see Figure 3C), or a composite member (described later) that combines two or more types of optical members.

[0030] (1-4-2) Function of the Second Optical Member The second optical member 121 is an optical member for directing at least a portion of the scattered light Sc1 generated in the detection area Da1 within the gap Vd1 into the light receiving unit 12. The scattered light Sc1 is generated when light emitted from the first optical member 111 into the emission range Or1 and entering the detection area Da1 is scattered by smoke particles Sp1 present in the detection area Da1.

[0031] The second optical member 121 allows at least a portion of the scattered light Sc1 generated in the detection area Da1 to be incident on the light receiving unit 12 by at least one of changing the path of the scattered light Sc1 generated in the detection area Da1 that travels through the incident range Ir1 toward the vertex, and blocking light that is traveling toward the light receiving unit 12 other than the scattered light Sc1 generated in the detection area Da1.

[0032] Specifically, the second optical member 121 changes the path of the scattered light Sc1 traveling through the incident range Ir1 to the direction of the optical axis of the light receiving unit 12, toward the light receiving unit 12 (i.e., the normal direction of the main surface 10A, toward the main surface 10A).

[0033] 1, 3A, and 3B, the second optical member 121 causes the scattered light Sc1, which is generated when the emitted light Og1 from the first optical member 111 toward the detection region Da1 in the gap Vd1 is scattered by smoke particles Sp1 present in the detection region Da1, to enter the light receiving unit 12. The second optical member 121 has a function (second optical path changing function) of changing the path of the scattered light Sc1 traveling through the incident region Ir1 by, for example, at least one of refraction (see FIGS. 1 and 3A) and reflection (see FIG. 3B). Note that the second optical path changing function may include at least one of a second light focusing function that focuses the scattered light Sc1 traveling through the incident region Ir1 and a second light scattering function that diffuses the scattered light Sc1 traveling through the incident region Ir1.

[0034] 3C , the second optical member 121 may have a function (second light blocking function) of blocking light other than scattered light Sc1 that is generated in the detection area Da1 and travels through the incident range Ir1, among light that travels through the gap Vd1 toward the light receiving unit 12. Alternatively, the second optical member 121 may have both the second optical path changing function and the second light blocking function.

[0035] 1 and 3A, like the first optical member 111, the second optical member 121 may be, for example, a lens prism as shown in Fig. 1 and 3A, but may also include a refractive member (described later) other than a lens prism. In general, the second optical member 121 may include any one type of optical member selected from the group consisting of a refractive member, a reflective member (described later: see Fig. 3B), and a light-blocking member (described later: see Fig. 3C), or a composite member (described later) that combines two or more types of optical members.

[0036] (1-5) Advantages According to the above configuration, by using the first optical member 111 and the second optical member 121 to change the orientation of the emission range Or1 and the incidence range Ir1 (the respective traveling directions of the emission light Og1 and the scattered light Sc1), it becomes possible to adjust the detection area Da1, which is the area where the emission range Or1 and the incidence range Ir1 intersect, and thus it becomes easier to adjust the smoke detection sensitivity.

[0037] Here, adjusting the detection area Da1 refers to at least one of moving the detection area Da1 and adjusting the size of the detection area Da1. Moving the detection area Da1 means, for example, moving the detection area Da1 away from the substrate 10 or moving it to a desired position, such as the center of the gap Vd1. Depending on the installation state of the smoke detection device 1, smoke may be concentrated in a part of the gap Vd1. Even in such a case, smoke detection sensitivity can be improved by moving the detection area Da1 to the position where the smoke is concentrated (for example, by adjusting the orientation of the rotation axes of the emission range Or1 and the incidence range Ir1 in advance).

[0038] Furthermore, adjusting the size of the detection region Da1 preferably enlarges the detection region Da1. By increasing the extent of at least one of the emission range Or1 and the incidence range Ir1 using the first optical member 111 and the second optical member 121, the detection region Da1 can be enlarged, thereby improving the smoke detection sensitivity. On the other hand, by blocking a portion of at least one of the emission range Or1 and the incidence range Ir1, the increase in light directed outside the detection region Da1 can be suppressed, thereby suppressing the increase in noise components.

[0039] Therefore, according to the present disclosure, it is possible to provide a smoke detection device 1 that can easily adjust the detection area Da1 and, therefore, the smoke detection sensitivity. Furthermore, it is possible to provide a smoke detection device 1 that can detect smoke with high sensitivity even when the light-emitting unit 11 and the light-receiving unit 12 are surface-mounted on the main surface 10A of the substrate 10.

[0040] (2) Main Parts Next, main parts of the embodiment and first to fourth modified examples of the present disclosure will be described with reference to FIGS. 3A to 3C and FIGS. 11A and 11B.

[0041] (2-1) Types of First and Second Optical Members Each of the first and second optical members 111 and 121 includes one or a combination of two or more of a refractive member, a reflective member, and a light-shielding member.

[0042] (2-1-1) Refractive Member A refractive member is a member that refracts light. The refractive member in the embodiment and the third modified example is a lens prism. A lens prism is a member that has the function of a prism, such as total internal reflection of light, as well as the function of a lens, such as focusing to collect light or diffusing light. In a lens prism, the second surface is a reflective surface that internally reflects light, and at least one of the first to third surfaces is a curved surface. A lens prism has the function of changing the path of light by internal reflection and at least one of focusing and diffusing light.

[0043] Specifically, the lens prism may be, for example, a rectangular prism having a first surface and a second surface each formed as a flat surface and a third surface formed as a curved surface (for example, a convex surface).

[0044] (2-1-2) Reflecting Member A reflecting member is a member that reflects light. The reflecting member in the first and fourth modified examples is a reflecting mirror. The reflecting mirror is, for example, a plane mirror with a flat reflective surface, but may also be a concave mirror with a concave reflective surface, or a convex mirror with a flat and convex reflective surface.

[0045] A plane mirror has a reflective function that simply reflects light and changes its direction of travel. A concave mirror has a reflective function that reflects light and changes its direction of travel, and a converging function that collects light. A convex mirror has a reflective function that reflects light and changes its direction of travel, and a diffusing function that diffuses light.

[0046] (2-1-3) Light-shielding member: A light-shielding member is a member that blocks part of light. The light-shielding member in the second to fourth modifications is a light-shielding plate. The light-shielding plate has the function of, for example, blocking part of the diffused light and narrowing the diffusion range.

[0047] (2-1-4) Composite Member A composite member is a member that combines two or more types of refractive members, reflective members, and light-blocking members. The composite member is used for both the first optical member 111 and the second optical member 121, or for either one of them.

[0048] (2-1-5) Common Optical Member for First and Second Optical Members In the embodiment, as shown in FIGS. 1, 3A, and 5, the first optical member 111 and the second optical member 121 are both refractive members.

[0049] In the first modified example, as shown in FIGS. 3B and 7, the first optical member 111 and the second optical member 121 are both reflective members.

[0050] In the second modified example, as shown in FIGS. 3C and 10, the first optical member 111 and the second optical member 121 are both light-blocking members.

[0051] (2-1-6) Use of different types of optical members for the first optical member and the second optical member In the third modified example, as shown in FIG. 11A, the first optical member 111 is a composite member that combines a refractive member and a light-blocking member, and the second optical member 121 is a refractive member.

[0052] In the fourth modification, as shown in FIG. 11B, the first optical member 111 is a composite member that combines a reflecting member and a light blocking member, and the second optical member 121 is a reflecting member.

[0053] (2-2) Void The void Vd1 is a space that exists between the first optical member 111 and the second optical member 121 and that does not contain any member such as a barrier, through which external air can pass. For example, as shown in Fig. 1 , the void Vd1 is a space (for example, a quadrangular prism-shaped space) that extends from a region (for example, a rectangular region) on the main surface 10A of the substrate 10 that is sandwiched between the first optical member 111 and the second optical member 121 in the normal direction of the main surface 10A.

[0054] However, the region of the main surface 10A sandwiched between the first optical member 111 and the second optical member 121 is not limited to a rectangular region and may be a circular region, etc. Furthermore, the space extending in the normal direction of the main surface 10A is not limited to a quadrangular prism-shaped space and may be a cylindrical space, etc.

[0055] (2-2-1) Detection Area The detection area Da1 is the area of ​​the gap Vd1 that is the target of smoke detection. The detection area Da1 is the area where the emission range Or1 and the incidence range Ir1 intersect (overlap).

[0056] (2-2-2) Smoke Detection As shown in Figure 3A, when smoke particles Sp1 are present in the detection area Da1 within the gap Vd1, the emitted light Og1 emitted into the emission range Or1 is scattered by the smoke particles Sp1, and scattered light Sc1 is generated that travels through the incident range Ir1 toward the second optical member 121.

[0057] The path of the scattered light Sc1 is changed via the second optical member 121 and is incident on the light receiving unit 12. The light receiving unit 12 outputs an electrical signal corresponding to the scattered light Sc1, such as an electrical signal corresponding to the amount of smoke or an electrical signal indicating that smoke has been detected.

[0058] (3) Embodiments Next, embodiments of the present disclosure will be described with reference to Figures 1, 2, 3A, 4A, 4B, and 5. Note that, in the following, descriptions of previously mentioned matters will be omitted or simplified.

[0059] 1, the first optical member 111 is located slightly above the second optical member 121 when viewed from the direction along the main surface 10A of the substrate 10. However, the positional relationship between the first optical member 111 and the second optical member 121 when viewed from the direction along the main surface 10A can be changed as appropriate depending on, for example, the characteristics of the first optical member 111 and the second optical member 121.

[0060] Also, as shown in Figure 2, the optical axis AX1 of the first optical member 111 and the optical axis AX2 of the second optical member 121 intersect with each other at an angle within a range of 90 degrees to 120 degrees (e.g., 100 degrees) when viewed from the direction of the optical axes of the light-emitting unit 11 and the light-receiving unit 12 (in other words, the normal direction to the main surface 10A of the substrate 10).

[0061] Since the optical axis AX1 of the first optical member 111 and the optical axis AX2 of the second optical member 121 intersect with each other at an angle within the range of 90 degrees to 120 degrees, selective detection of scattered light Sc1 by smoke particles Sp1 becomes easier, thereby improving the smoke detection sensitivity.

[0062] (3-2) Detector As shown in Fig. 12B, the smoke detector 1 of this embodiment further includes a detector 16. The detector 16 detects the presence of smoke particles Sp1 in the gap Vd1 based on the electrical signal from the light-receiving unit 12. The detector 16 may also be capable of measuring the amount (e.g., concentration) of smoke present in the gap Vd1 based on the electrical signal from the light-receiving unit 12.

[0063] (3-3) Conductive Pattern Section As shown in Fig. 6, the substrate 10 has a conductive pattern section 15. The conductive pattern section 15 is a member configured with a thin plate-like pattern having electrical conductivity. The conductive pattern section 15 is provided so as to surround at least one of the light-emitting section 11 and the light-receiving section 12.

[0064] The conductive pattern portion 15 in this embodiment includes a first conductive pattern portion 151 surrounding the light-emitting portion 11 and a second conductive pattern portion 152 surrounding the light-receiving portion 12 .

[0065] In this way, the substrate 10 having the conductive pattern portion 15 can perform at least one of supplying power to the light emitting portion 11 and outputting an electrical signal from the light receiving portion 12 .

[0066] 1 and 3A, in this embodiment, when smoke particles Sp1 are present in the detection area Da1, light (emitted light Og1) emitted from the light-emitting unit 11 into the emission range Or1 via the first optical member 111 is scattered by the smoke particles Sp1, and part of the scattered light (scattered light Sc1) traveling through the incidence range Ir1 is incident on the light-receiving unit 12 via the second optical member 121. In this way, the light-receiving unit 12 receives the scattered light Sc1 and outputs an electrical signal to the detection unit 16, thereby enabling detection of the presence of smoke particles Sp1 in the detection area Da1.

[0067] For example, by changing the orientation of the emission range Or1 and the incidence range Ir1 (the respective directions of travel of the emission light Og1 and the scattered light Sc1) using the first optical member 111 and the second optical member 121, it is possible to adjust the detection area Da1, which is the area where the emission range Or1 and the incidence range Ir1 intersect, and thereby facilitate adjustment of the smoke detection sensitivity.

[0068] Furthermore, for example, by increasing the extent of the emission range Or1 and the incidence range Ir1 while blocking part of the emission range Or1 and the incidence range Ir1 using the first optical member 111 and the second optical member 121, it is possible to suppress an increase in light directed outside the detection area Da1, and therefore an increase in noise components. Therefore, even when the extent of light in at least one of the emission range Or1 and the incidence range Ir1 is increased, it is possible to suppress an increase in noise components, thereby improving smoke detection sensitivity.

[0069] (3-5) First Refractive Member and Second Refractive Member In this embodiment, the first optical member 111 includes a first refractive member 111Ra, and the second optical member 121 includes a second refractive member 121Ra. Each of the first refractive member 111Ra and the second refractive member 121Ra is a lens prism. Note that hereinafter, the first refractive member 111Ra may be referred to as the "first lens prism 111Ra," and the second refractive member 121Ra may be referred to as the "second lens prism 121Ra."

[0070] 3A, the first optical member 111 in this embodiment is a first lens prism 111Ra. The first lens prism 111Ra has a first surface (here, a flat surface) onto which light (diffused light) from the light-emitting unit 11 is incident, a second surface (here, a flat surface) onto which the light incident from the first surface is totally reflected by internal reflection, and a third surface (here, a convex surface) from which the light totally reflected by the second surface exits.

[0071] 3A, second optical member 121 in this embodiment includes second lens prism 121Ra. Second lens prism 121Ra has a first surface (convex in this case) onto which scattered light Sc1 generated when light emitted from the third surface of first lens prism 111Ra is scattered by smoke particles Sp1 is incident, a second surface (flat in this case) onto which the light incident from the first surface is totally reflected by internal reflection, and a third surface (flat in this case) from which the light totally reflected at the second surface exits.

[0072] In this way, the light emitted from the third surface of the second lens prism 121Ra in a direction along the optical axis of the light receiving unit 12 is efficiently received by the light receiving unit 12.

[0073] According to this configuration, by using the first lens prism 111Ra and the second lens prism 121Ra to change the orientation of each of the emission range Or1 and the incidence range Ir1, it is possible to easily adjust the detection area Da1 and, therefore, the smoke detection sensitivity.

[0074] Furthermore, when the first lens prism 111Ra and the second lens prism 121Ra are used, it is possible to change the extent of each of the emission range Or1 and the incidence range Ir1 (concentrating or diffusing light), which makes it easier to adopt various types of light-emitting units 11, from narrow-angle types to wide-angle types.

[0075] However, even if only one of the first lens prism 111Ra and the second lens prism 121Ra is used, it is possible to facilitate adjustment of the smoke detection sensitivity and to facilitate the adoption of various light-emitting units 11.

[0076] Furthermore, even if optical elements other than lens prisms (for example, simple prisms or simple lenses) are used as the first optical element 111 and the second optical element 121, it is possible to facilitate adjustment of the smoke detection sensitivity.

[0077] (3-6) Cover As shown in Figures 4B and 5, the smoke detection device 1 further includes a cover 13. The cover 13 includes a first cover 131 that covers the light-emitting unit 11 and a second cover 132 that covers the light-receiving unit 12.

[0078] (3-6-1) First Cover and Second Cover As shown in Fig. 5, the first cover 131 has a first hole 131a between the light-emitting unit 11 and the first optical member 111, through which light emitted from the light-emitting unit 11 passes. As shown in Fig. 5, the second cover 132 has a second hole 132a between the light-receiving unit 12 and the second optical member 121, through which light incident on the light-receiving unit 12 passes. The first cover 131 and the second cover 132 are integral with each other, as shown in Fig. 5.

[0079] In this way, by providing the first cover 131, the smoke detection device 1 can suppress noise caused by light other than the light emitted by the light-emitting unit 11 (i.e., light from outside the smoke detection device 1) entering the first optical member 111. Furthermore, by providing the second cover 132, the smoke detection device 1 can suppress noise caused by light other than the scattered light generated in the detection area Da1 within the gap Vd1 (i.e., scattered light generated outside the detection area Da1 or light from outside the smoke detection device 1) entering the light-receiving unit 12.

[0080] Furthermore, since the first cover 131 and the second cover 132 are integrated, the smoke detection device 1 can achieve at least one of the following: a reduced number of parts, easier manufacturing, and a stronger structure.

[0081] (3-6-2) As shown in Figures 4A and 5, the first attachment portion cover 13 further has a first attachment portion 133. The first attachment portion 133 is a member for attaching the cover 13 to the substrate 10. It is preferable that the cover 13 have two or more first attachment portions 133.

[0082] 5, the cover 13 has three first attachment portions 133. Specifically, in addition to the first cover 131 and the second cover 132 each having a first attachment portion 133, the cover 13 also has first attachment portions 133 on portions other than the first cover 131 and the second cover 132.

[0083] In this way, by providing the first mounting portion 133, the smoke detection device 1 can mount the cover 13 to the substrate 10 without increasing the number of parts.

[0084] (3-6-3) Support Member As shown in Figures 1, 2, 3A, 4A, 4B, and 5, the smoke detection device 1 of this embodiment further includes a support member 14. The support member 14 is a member that supports the first optical member 111 and the second optical member 121. The support member 14 includes a first support member 141 that supports the first optical member 111 and a second support member 142 that supports the second optical member 121. The first support member 141 and the second support member 142 are integral with each other.

[0085] In this embodiment, the first support member 141 and the second support member 142 hold the first refractive member 111Ra and the second refractive member 121Ra (specifically, the first lens prism 111Ra and the second lens prism 121Ra), respectively, as shown in Figures 1, 3A, and 5.

[0086] (3-6-4) Second Mounting Portion As shown in Fig. 5, the support member 14 has a second mounting portion 143. The second mounting portion 143 is a member for mounting the support member 14 to the cover 13. It is preferable that the support member 14 has two or more second mounting portions 143.

[0087] 5 , the first support member 141 and the second support member 142 each have a second mounting portion 143. However, the support member 14 may have only a single second mounting portion 143. Alternatively, instead of the support member 14 having the second mounting portion 143, the cover 13 may have the second mounting portion 143, or each of the cover 13 and the support member 14 may have the second mounting portion 143.

[0088] In the smoke detection device 1 of this embodiment, the provision of the support member 14 makes it possible to accurately maintain the positional relationship between the light-emitting unit 11 and the first optical member 111, and the positional relationship between the light-receiving unit 12 and the second optical member 121. Furthermore, the provision of the second mounting portion 143 in the support member 14 makes it possible to mount the support member 14 to the support member 14 without increasing the number of parts.

[0089] (3-6-5) As shown in FIGS. 4A, 4B, and 5, the labyrinth support member 14 further includes a plurality of labyrinths 144. The labyrinths 144 are arranged in a circle so as to surround the gap Vd1. Each of the labyrinths 144 has a V-shape when viewed from the normal direction of the main surface 10A of the substrate 10, and the apex corresponding to the tip of the V-shape faces in the same circumferential direction (for example, clockwise or counterclockwise). In this way, by arranging the V-shaped labyrinths 144 in a circle so as to surround the gap Vd1 and in the same circumferential direction, it is possible to suppress the intrusion of external light into the gap Vd1 while allowing external air to pass in and out of the gap Vd1.

[0090] (4) First Modification Next, a smoke detection device 1 according to a first modification will be described with reference to Figures 3B, 6, and 7. Note that, in the following, descriptions of matters common to the embodiment will be omitted or simplified.

[0091] 3B and 7, the first optical member 111 is a first reflecting member 111Re, and the second optical member 121 is a second reflecting member 121Re. Each of the first reflecting member 111Re and the second reflecting member 121Re is a reflecting mirror, and each of the first support member 141 and the second support member 142 supports the reflecting mirror. The reflecting mirror may be a reflecting surface formed on the support member 14. It is preferable that a reflective film made of metal such as aluminum is formed on the reflective surface by vapor deposition or the like.

[0092] In this modified example, as shown in FIG. 3B, the first reflecting member 111Re is used to change the direction of the emission range Or1) (the direction in which the emitted light Og1 travels), and the second reflecting member 121Re is used to change the direction of the incident range Ir1) (the direction in which the scattered light Sc1 travels), thereby facilitating the adjustment of the detection area Da1 and, in turn, the adjustment of the smoke detection sensitivity.

[0093] Furthermore, when the first reflecting member 111Re and the second reflecting member 121Re are used, costs can be reduced by forming a reflecting surface on each of the first supporting member 141 and the second supporting member 142, for example.

[0094] Furthermore, when the first reflecting member 111Re and the second reflecting member 121Re are used, by making the reflecting surfaces curved (for example, concave or convex), it becomes possible to change the extent of each of the emission range Or1 and the incidence range Ir1 (concentrating or diffusing light), thereby facilitating the adoption of various light-emitting units 11 ranging from narrow-angle types to wide-angle types.

[0095] However, by using only one of the first reflecting member 111Re and the second reflecting member 121Re, it is possible to achieve at least one of the following: facilitating adjustment of the smoke detection sensitivity, reducing costs, and facilitating the adoption of various light-emitting units 11.

[0096] (5) Second Modification Next, a smoke detection device 1 according to a second modification will be described with reference to Figures 3C, 8, and 9. Note that, in the following, descriptions of matters common to the embodiment will be omitted or simplified.

[0097] In this modification, as shown in FIGS. 3C and 9, the first optical member 111 is a first light-shielding member 111Sd, and the second optical member 121 is a second light-shielding member 121Sd.

[0098] 3C and 9, in this modification, the first light-shielding member 111Sd and the second light-shielding member 121Sd are each a light-shielding plate, and the first support member 141 and the second support member 142 each support a light-shielding plate. Note that the light-shielding plate may be formed integrally with the support member 14.

[0099] According to this modification, by using the first light-shielding member 111Sd and the second light-shielding member 121Sd to narrow the emission range Or1 and the incidence range Ir1 (blocking a portion of the light emitted from the light-emitting unit 11 and a portion of the light directed to the light-receiving unit 12), it is possible to suppress light directed from the light-emitting unit 11 to the outside of the detection area Da1 and to suppress light directed from the outside to the light-receiving unit 12, and thereby suppress an increase in noise components. Therefore, when the first light-shielding member 111Sd and the second light-shielding member 121Sd are used, by adopting a wide-angle light-emitting unit 11, it is possible to expand the detection area Da1 and thereby improve detection sensitivity.

[0100] However, even if only one of the first light-shielding member 111Sd and the second light-shielding member 121Sd is used, it is possible to facilitate adjustment of the detection sensitivity.

[0101] In each of the above-described embodiment, first modified example, and second modified example, at least one of the first optical member 111 and the second optical member 121 may include a composite member. A composite member is a member that combines two or more types of refractive members that refract light (first refractive member 111Ra, second refractive member 121Ra), reflective members that reflect light (first reflecting member 111Re, second reflecting member 121Re), and light-shielding members that block part of light (first light-shielding member 111Sd, second light-shielding member 121Sd). In the third and fourth modified examples, a case will be described in which the first optical member 111 includes a composite member.

[0102] (6) Third Modification Next, a smoke detection device 1 according to a third modification will be described with reference to Fig. 11A. Note that, in the following, descriptions of matters common to the embodiment and the second modification will be omitted or simplified.

[0103] In this modification, as shown in FIG. 11A, the first optical member 111 includes a composite member that combines a refractive member (first refractive member 111Ra) and a light-shielding member (first light-shielding member 111Sd).

[0104] According to this modified example, by using a composite member that combines two types of members, a refractive member (first refractive member 111Ra) and a reflective member (first reflective member 111Re), as the first optical member 111, it is possible to more accurately change the direction and extent of the emission range Or1 (i.e., the path of the emitted light Og1), thereby further adjusting the detection area Da1 and thereby further facilitating the adjustment of the detection sensitivity.

[0105] Furthermore, by using a composite member that combines a refractive member (second refractive member 121Ra) and a shading member (second shading member 121Sd) with the second optical member 121 instead of the first optical member 111, it is possible to further adjust the detection area Da1 and, in turn, to further facilitate the adjustment of the smoke detection sensitivity.

[0106] Furthermore, by using a composite member that combines a refractive member (first refractive member 111Ra, second refractive member 121Ra) and a shading member (first shading member 111Sd, second shading member 121Sd) for each of the first optical member 111 and the second optical member 121, it is possible to further adjust the detection area Da1, and thereby to further facilitate adjustment of the smoke detection sensitivity.

[0107] Furthermore, by using a composite member that combines three types of members, namely, a refractive member (first refractive member 111Ra, second refractive member 121Ra), a reflective member (first reflective member 111Re, second reflective member 121Re), and a light-shielding member (first light-shielding member 111Sd, second light-shielding member 121Sd), for either or both of the first optical member 111 and the second optical member 121, it is possible to more accurately change the direction and extent of the emission range Or1 (i.e., the path of the emitted light Og1) while blocking part of the light emitted from the light-emitting unit 11 and the light to the light-receiving unit 12, thereby employing a wide-angle type light-emitting unit 11 and further facilitating adjustment of the detection sensitivity.

[0108] (7) Fourth Modification Next, a smoke detection device 1 according to a fourth modification will be described with reference to Fig. 11B. Note that, in the following, descriptions of matters common to the first and second modifications will be omitted or simplified.

[0109] In this modification, as shown in FIG. 11B, the first optical member 111 includes a composite member that combines a reflective member (first reflective member 111Re) and a light-shielding member (first light-shielding member 111Sd).

[0110] According to this modification, by using a composite member that combines two types of members, a reflective member (first reflective member 111Re) and a light-blocking member (first light-blocking member 111Sd), as the first optical member 111, it is possible to more accurately change the direction and extent of the emission range Or1 (i.e., the path of the emitted light Og1), thereby further facilitating adjustment of the detection area Da1 and, in turn, adjustment of the detection sensitivity. Also, in this modification, while avoiding a complex configuration, it is possible to further facilitate adjustment of the detection sensitivity by employing, for example, a wide-angle light-emitting unit 11.

[0111] In addition, by using a composite member that combines a reflective member (second reflective member 121Re) and a shading member (second shading member 121Sd) with the second optical member 121 instead of the first optical member 111, it is possible to further adjust the detection area Da1 and, in turn, to further facilitate the adjustment of the smoke detection sensitivity.

[0112] Furthermore, by using a composite member that combines a reflective member (first reflective member 111Re, second reflective member 121Re) and a shading member (first shading member 111Sd, second shading member 121Sd) for each of the first optical member 111 and the second optical member 121, it is possible to further adjust the detection area Da1, and thereby to further facilitate adjustment of the smoke detection sensitivity.

[0113] (8) Other Embodiments: Detector Another embodiment of the present disclosure is a detector 30 including a housing 2 having an opening 21 and a smoke detection device 1, as shown in Fig. 12A . As shown in Fig. 12B , the smoke detection device 1 further includes a communication unit 17 in addition to a light-emitting unit 11, a light-receiving unit 12, and a detection unit 16. A portion of the smoke detection device 1 is housed in the opening 21 of the housing 2.

[0114] According to this embodiment, it is possible to easily adjust the smoke detection sensitivity.

[0115] (9) Other Embodiments: Detection System Another embodiment of the present disclosure is a detection system 100 including a detector 30 and a communication device 20, as shown in Fig. 12B. The communication device 20 communicates with the detector 30. The communication device 20 may be, for example, a receiver that receives a signal from the detector 30 indicating that smoke has been detected.

[0116] According to this embodiment, it is possible to easily adjust the smoke detection sensitivity.

[0117] (10) Other Modifications (10-1) Modifications of the Light Emitting Unit and the Light Receiving Unit The light emitting element of the light emitting unit 11 is not limited to an LED, and may be, for example, a laser diode (LD), or the like, and any type is acceptable.

[0118] In the embodiment, the light-emitting unit 11 is a surface-mounted light-emitting module that has a lens and a substrate in addition to the light-emitting element, but it does not have to have at least one of the lens and the substrate. That is, the light-emitting unit 11 may be a surface-mounted light-emitting module that does not have a lens but has a light-emitting element and a substrate. The light-emitting unit 11 may also be a light-emitting module that does not have a substrate, and in which the light-emitting element and the lens are mounted directly on the main surface 10A of the substrate 10. Furthermore, the light-emitting unit 11 may be the light-emitting element itself that is mounted directly on the main surface 10A of the substrate 10, without having a lens or a substrate.

[0119] The light receiving element included in the light receiving unit 12 is not limited to a PD, but may be, for example, a CMOS (Complementary Metal-Oxide-Semiconductor) or the like, and any type may be used.

[0120] In the embodiment, the light receiving unit 12 is a surface-mount type light receiving module having a light receiving element, a lens, and a substrate, but it may not have at least one of the lens and the substrate. That is, the light receiving unit 12 may be a surface-mount type light receiving module having a light receiving element and a substrate without a lens. The light receiving unit 12 may also be a type of light receiving module without a substrate, in which the light receiving element and lens are mounted directly on the main surface 10A of the substrate 10. Furthermore, the light receiving unit 12 may be a light receiving element itself mounted directly on the main surface 10A of the substrate 10 without a lens or a substrate.

[0121] (10-2) Modification of Location of Detector The detector 16 may be located outside the smoke detector 1. For example, the detector 30 may include the smoke detector 1 including the light-emitting unit 11 and the light-receiving unit 12, and the detector 16 provided outside the smoke detector 1.

[0122] Alternatively, the detector 30 may include the smoke detection device 1 including the light-emitting unit 11 and the light-receiving unit 12, and the communication unit 17, while the receiver may include the communication device 20 and the detection unit 16. In this case, in the detector 30, the communication unit 17 transmits an electrical signal from the light-receiving unit 12 to the receiver. In the receiver, the communication device 20 receives the electrical signal from the detector 30, and the detection unit 16 detects the occurrence of smoke in the environment in which the detector 30 is installed based on the received electrical signal.

[0123] (10-3) Modification of Refractive Members In the above embodiment, the refractive members (first refractive member 111Ra, second refractive member 121Ra) are lens prisms, but in this modification, they may be lenses. The lenses may be either a converging lens (for example, a convex lens) that has a converging function of refracting and collecting (concentrating) the light from the light-emitting unit 11, or a diffusing lens (for example, a concave lens) that has a diffusing function of refracting and spreading (diffusing) the light from the light-emitting unit 11, or a combination of the two types (for example, a compound lens that combines a convex lens and a concave lens).

[0124] The light-collecting function may be, for example, a function of collecting diffused light from the light-emitting unit 11 and making it closer to parallel light. The light-scattering function may be, for example, a function of further widening (widening the angle of view) the diffused light from the light-emitting unit 11.

[0125] Alternatively, the refractive members (first refractive member 111Ra, second refractive member 121Ra) may be prisms. The prism may be, for example, a right-angle prism. The right-angle prism bends incident light that is perpendicular to the first surface from the light-emitting unit by utilizing total internal reflection at the second surface corresponding to the hypotenuse of an isosceles right-angle triangle, and emits the outgoing light perpendicularly from the third surface. However, the angle between the incident light and the outgoing light may be within a range in which total reflection occurs at the second surface.

[0126] (10-4) Modification of the first mounting portion In each of the embodiment (see Figure 5), the first modification (see Figure 7) and the second modification (see Figure 9), the first mounting portion 133 is provided on the cover 13 (for example, each of the first cover 131 and the second cover 132), but in this modification, the substrate 10 may have the first mounting portion 133, or each of the substrate 10 and the cover 13 may have the first mounting portion 133.

[0127] (10-5) Modifications of the first support member and the second support part The first support member 141 and the second support member 142 are integral in each of the embodiment (see FIG. 5), the first modification (see FIG. 7), and the second modification (see FIG. 9), but in this modification they may be separate.

[0128] (10-6) Modifications Related to the Cover The smoke detection device 1 in this modification does not have to include the cover 13. In this modification, since there is no cover 13, the second attachment portion 143 is also unnecessary. Even in a smoke detection device 1 that does not include the cover 13, by storing a portion of the side on which the light-emitting unit 11 and the light-receiving unit 12 are arranged in the housing 2, it is possible to prevent light from entering the light-emitting unit 11 and the light-receiving unit 12 from outside the smoke detection device 1.

[0129] Alternatively, for example, in the housing 2 of Figure 12B, when the smoke detection device 1 is stored in the opening 21, an air passage is secured between the smoke detection device 1 and the opening 21, and the entire smoke detection device 1 without the cover 13 is configured to be stored in the opening 21, thereby preventing light from entering the light-emitting unit 11 and the light-receiving unit 12 from the outside.

[0130] (10-7) Further Modifications Regarding Use of Different Types of Optical Members In the third modification, the second optical member 121 may include a composite member (a refractive member (second refractive member 121Ra) and a light-shielding member (second light-shielding member 121Sd)) similar to that of the first optical member 111, or may include a composite member of a different combination from that of the first optical member 111. A composite member of a different combination from that of the first optical member 111 is, for example, a combination of a reflective member (second reflective member 121Re) and a light-shielding member (second light-shielding member 121Sd), or a combination of a refractive member (second refracting member 121Ra) and a reflective member (second reflective member 121Re).

[0131] In the fourth modified example, the second optical member 121 may include a composite member similar to that of the first optical member 111, or may include a composite member of a different combination from that of the first optical member 111. A composite member of a different combination from that of the first optical member 111 is, for example, a combination of a refractive member (second refractive member 121Ra) and a light-shielding member (second light-shielding member 121Sd), or a combination of a refractive member (second refractive member 121Ra) and a reflecting member (second reflecting member 121Re).

[0132] In other modified examples, the first optical member 111 and the second optical member 121 may be different types of members. That is, one of the first optical member 111 and the second optical member 121 may be a refractive member (first refractive member 111Ra, second refractive member 121Ra) and the other may be a reflective member (first reflecting member 111Re, second reflecting member 121Re). Alternatively, one of the first optical member 111 and the second optical member 121 may be a refractive member (first refractive member 111Ra, second refractive member 121Ra) and the other may be a light-shielding member (first light-shielding member 111Sd, second light-shielding member 121Sd), or one may be a reflective member (first reflecting member 111Re, second reflecting member 121Re) and the other a light-shielding member (first light-shielding member 111Sd, second light-shielding member 121Sd).

[0133] (10-8) Modifications regarding the positional relationship between the first optical member and the second optical member In the embodiment, the first optical member 111 is positioned slightly above the second optical member 121 when viewed from a direction along the main surface 10A of the substrate 10 (see Figures 1 and 3A), but it may also be positioned at the same position or slightly below.

[0134] In the embodiment, the optical axis AX1 of the first optical member 111 and the optical axis AX2 of the second optical member 121 intersect at an angle in the range of 90 degrees to 120 degrees when viewed from the normal direction of the main surface 10A of the substrate 10 (see FIG. 2 ), but the optical axis AX1 of the first optical member 111 and the optical axis AX2 of the second optical member 121 may be opposed to each other. In this modification, by providing a barrier or the like between the first optical member 111 and the second optical member 121, it is possible to detect smoke even if the optical axis AX1 of the first optical member 111 and the optical axis AX2 of the second optical member 121 are opposed to each other.

[0135] (10-9) Modification of Cover The smoke detection device 1 in the embodiment includes a cover 13 having a first cover 131 and a second cover 132. The first cover 131 and the second cover 132 are integral with each other, but the first cover 131 and the second cover 132 may be separate. The smoke detection device 1 in this modification includes the first cover 131 and the second cover 132 that is separate from the first cover 131.

[0136] Alternatively, the smoke detection device 1 in this modified example may include only one of the first cover 131 and the second cover 132. That is, even a smoke detection device 1 that includes the first cover 131 but not the second cover 132 can suppress noise caused by light other than light emitted by the light-emitting unit 11 (i.e., light from outside) entering the first optical member 111. Furthermore, even a smoke detection device 1 that includes the second cover 132 but not the first cover 131 can suppress noise caused by scattered light generated outside the detection region Da1 or light from outside entering the light-receiving unit 12.

[0137] (11) Summary The smoke detection device (1) according to the first aspect comprises a substrate (10), a light-emitting unit (11) surface-mounted on the main surface (10A) side of the substrate (10), a light-receiving unit (12) surface-mounted on the main surface (10A) side of the substrate (10), a first optical member (111) provided on the light-emitting side of the light-emitting unit (11), and a second optical member (121) provided on the light-incident side of the light-receiving unit (12), and a gap (Vd1) exists between the first optical member (111) and the second optical member (121).

[0138] According to this aspect, when smoke particles (Sp1) are present in the gap (Vd1), light (emitted light) emitted from the light-emitting unit (11) through the first optical member (111) into the gap (Vd1) is scattered by the smoke particles (Sp1), and the scattered light (scattered light Sc1) enters the light-receiving unit (12) through the second optical member (121). In this way, the light-receiving unit (12) receives the scattered light and outputs an electrical signal, thereby detecting the presence of smoke particles (Sp1) in the gap (Vd1).

[0139] For example, by changing the orientation of the emission range (Or1) and the incidence range (Ir1) (the direction of travel of the emission light Og1 and the scattered light Sc1) using the first optical member (111) and the second optical member (121), it is possible to adjust the detection area (Da1), which is the area where the emission range (Or1) and the incidence range (Ir1) intersect, and thus facilitate adjustment of the smoke detection sensitivity.

[0140] Furthermore, by using the first optical member (111) and the second optical member (121), for example, the extent of the emission range (Or1) and the incidence range (Ir1) can be increased while blocking a portion of the light emitted from the light-emitting unit (11) and the light to the light-receiving unit (12), thereby suppressing an increase in light directed outside the detection area (Da1) and, in turn, suppressing an increase in noise components. Therefore, even when the extent of the emission range (Or1) and the incidence range (Ir1) is increased, it is possible to suppress an increase in noise components, thereby further facilitating adjustment of the smoke detection sensitivity.

[0141] In the smoke detection device (1) according to the second aspect, in the first aspect, the first optical member (111) directs at least a portion of the light emitted from the light-emitting unit (11) toward the detection area (Da1) in the gap (Vd1). The second optical member (121) directs at least a portion of the scattered light generated in the detection area (Da1) in the gap (Vd1) to enter the light-receiving unit (12).

[0142] According to this aspect, by changing the directions of the emission range (Or1) and the incidence range (Ir1) (the traveling directions of the emission light Og1 and the scattered light Sc1) using the first optical member (111) and the second optical member (121), it is possible to easily adjust the detection area (Da1), which is the area where the emission range (Or1) and the incidence range (Ir1) intersect, and thus to easily adjust the smoke detection sensitivity.

[0143] In the smoke detection device (1) according to the third aspect, in the second aspect, the first optical member (111) directs at least a portion of the light emitted from the light-emitting unit (11) toward the detection area (Da1) by at least one of changing the path of the light emitted from the light-emitting unit (11) and blocking light emitted from the light-emitting unit (11) that is directed outside the detection area (Da1). The second optical member (121) directs at least a portion of the scattered light (Sc1) generated in the detection area (Da1) into the light-receiving unit (12) by at least one of changing the path of the scattered light (Sc1) generated in the detection area (Da1) and blocking light directed toward the light-receiving unit (12) other than the scattered light generated in the detection area (Da1).

[0144] According to this aspect, the first optical member (111) and the second optical member (121) increase the extent of at least one of the emission range (Or1) and the incidence range (Ir1), while shading a portion of at least one of the emission range (Or1) and the incidence range (Ir1), thereby suppressing the increase in light directed outside the detection area (Da1), and thereby suppressing the increase in noise components.

[0145] The smoke detection device (1) according to a fourth aspect is the smoke detection device (1) of any one of the first to third aspects, further comprising a first cover (131) that covers the light-emitting unit (11). The first cover (131) has a first hole (131a) between the light-emitting unit (11) and the first optical member (111). The first hole (131a) allows light emitted by the light-emitting unit (11) to pass through.

[0146] According to this aspect, it is possible to suppress noise caused by light other than the light emitted by the light-emitting section (11) (i.e., light from outside) entering the first optical member (111).

[0147] A smoke detection device (1) according to a fifth aspect is the smoke detection device (1) of any one of the first to fourth aspects, further comprising a second cover (132) that covers the light receiving unit (12). The second cover (132) has a second hole (132a) between the light receiving unit (12) and the second optical member (121). The second hole (132a) passes light that enters the light receiving unit (12).

[0148] According to this aspect, it is possible to suppress noise caused by light (i.e., light from outside) other than light that has passed through the second optical member (121) (scattered light Sc1) entering the light receiving unit (12).

[0149] A smoke detection device (1) according to a sixth aspect is any one of the first to third aspects, further comprising a cover (13). The cover (13) has a first cover (131) that covers the light-emitting unit (11) and a second cover (132) that covers the light-receiving unit (12). The first cover (131) has a first hole (131a) between the light-emitting unit (11) and the first optical member (111) through which light emitted from the light-emitting unit (11) passes. The second cover (132) has a second hole (132a) between the light-receiving unit (12) and the second optical member (121) through which light incident on the light-receiving unit (12) passes. The first cover (131) and the second cover (132) are integral with each other.

[0150] According to this aspect, it is possible to suppress noise caused by light other than the light emitted by the light-emitting unit (11) (i.e., light from the outside) entering the first optical member (111), and it is also possible to suppress noise caused by light other than the light (scattered light Sc1) that has passed through the second optical member (121) (i.e., light from the outside) entering the light-receiving unit (12). The first cover (131) and the second cover (132) are integral with each other, which makes it possible to achieve at least one of a reduction in the number of parts, simplification of manufacturing, and strengthening of the structure.

[0151] In the smoke detection device (1) according to the seventh aspect, in the sixth aspect, the cover (13) further has a first attachment portion (133) for attaching the cover (13) to the substrate (10).

[0152] According to this aspect, the cover (13) can be attached to the substrate (10) without increasing the number of parts.

[0153] The smoke detection device (1) according to the eighth aspect is any one of the first to third aspects, and further includes a support member (14) that supports the first optical member (111) and the second optical member (121).

[0154] According to this aspect, the positional relationship between the light-emitting section (11) and the first optical member (111), and the positional relationship between the light-receiving section (12) and the second optical member (121) can each be accurately maintained.

[0155] The smoke detection device (1) according to a ninth aspect is the seventh aspect, further comprising a support member (14) that supports the first optical member (111) and the second optical member (121). The support member (14) has a second mounting portion (143) for mounting the support member (14) to the cover (13).

[0156] According to this aspect, the support member (14) can accurately maintain the positional relationship between the light-emitting unit (11) and the first optical member (111), and the positional relationship between the light-receiving unit (12) and the second optical member (121). Furthermore, since the support member (14) has the second mounting portion (143), the support member (14) can be mounted to the support member (14) without increasing the number of parts.

[0157] In the smoke detection device (1) according to the tenth aspect, in any of the first to third aspects, at least one of the first optical member (111) and the second optical member (121) includes a refractive member (111Ra, 121Ra) that refracts light.

[0158] According to this aspect, by using the refractive members (111Ra, 121Ra), the orientation of at least one of the emission range (Or1) and the incidence range (Ir1) (the traveling direction of at least one of the emission light Og1 and the scattered light Sc1) can be changed, thereby facilitating adjustment of the detection area (Da1) and therefore adjustment of the detection sensitivity. Furthermore, when the refractive members (111Ra, 121Ra) are used, it is possible to change the extent of at least one of the emission range (Or1) and the incidence range (Ir1) (to focus or diffuse light), which makes it possible to easily adopt various light-emitting units (11) ranging from narrow-angle types to wide-angle types.

[0159] In the smoke detection device (1) according to the eleventh aspect, in any of the first to third aspects, at least one of the first optical member (111) and the second optical member (121) includes a reflective member (111Re, 121Re) that reflects light.

[0160] According to this aspect, by using the reflecting members (111Re, 121Re), the direction of at least one of the emission range (Or1) and the incidence range (Ir1) (the traveling direction of at least one of the emission light Og1 and the scattered light Sc1) can be changed, thereby facilitating adjustment of the detection area (Da1) and therefore adjustment of the detection sensitivity. Furthermore, when the reflecting members (111Re, 121Re) are used, for example, by forming a reflective surface on the support member (14), cost reduction can be achieved.

[0161] In addition, when using the reflective member (111Re, 121Re), by making the reflective surface a curved surface (for example, a concave or convex surface), it is possible to change the extent of at least one of the emission range (Or1) and the incidence range (Ir1) (to concentrate or diffuse light), thereby facilitating the adoption of various light-emitting units (11) ranging from narrow-angle types to wide-angle types.

[0162] In the smoke detection device (1) according to the twelfth aspect, in any of the first to third aspects, at least one of the first optical member (111) and the second optical member (121) includes a light-shielding member (111Sd, 121Sd) that blocks part of the light.

[0163] According to this aspect, by using the light-shielding members (111Sd, 121Sd) to narrow at least one of the emission range (Or1) and the incidence range (Ir1) (by blocking at least a portion of the light from the light-emitting unit 11 and the light to the light-receiving unit 12), it is possible to suppress an increase in light directed outside the detection area (Da1), and thus in noise components. Therefore, when the light-shielding members (111Sd, 121Sd) are used, by employing a wide-angle type light-emitting unit (11), it is possible to facilitate adjustment of the detection area (Da1), and therefore adjustment of the detection sensitivity.

[0164] In the smoke detection device (1) according to the thirteenth aspect, in any of the first to third aspects, at least one of the first optical member (111) and the second optical member (121) includes a composite member that combines two or more of a refractive member (111Ra, 121Ra) that refracts light, a reflective member (111Re, 121Re) that reflects light, and a light-shielding member (111Sd, 121Sd) that blocks part of the light.

[0165] According to this aspect, by using a composite member that combines two or more types of members selected from the group consisting of refractive members (111Ra, 121Ra), reflective members (111Re, 121Re), and light-shielding members (111Sd, 121Sd) for at least one of the first optical member (111) and the second optical member (121), it is possible to further adjust the detection area (Da1), and thereby further facilitate adjustment of the smoke detection sensitivity.

[0166] For example, by using a composite member that combines two types of members, a refractive member (111Ra) and a reflective member (111Re), as the first optical member (111), it is possible to more accurately change the direction and spread of the emission range (Or1) (the direction of travel and spread of the emitted light Og1), thereby further adjusting the detection area (Da1) and thereby further facilitating the adjustment of the detection sensitivity.

[0167] Furthermore, by using a composite member that combines three types of members, namely, a refractive member (111Ra), a reflective member (111Re), and a light-shielding member (111Sd), as the first optical member (111), it is possible to more accurately change the direction and spread of the emission range (Or1) (the direction of travel and spread of the emitted light Og1) while shading part of the light (emission range Or1), and thereby, for example, it is possible to employ a wide-angle type light-emitting unit (11) and further facilitate adjustment of the detection sensitivity.

[0168] In the smoke detection device (1) according to the fourteenth aspect, in the thirteenth aspect, the composite member is a member that combines either one of a refractive member (111Ra, 121Ra) and a reflective member (111Re, 121Re) with a light-shielding member (111Sd, 121Sd).

[0169] According to this aspect, by using a composite member that combines either a refractive member (111Ra, 121Ra) or a reflective member (111Re, 121Re) with a light-shielding member (111Sd, 121Sd), it is possible to avoid a complex configuration while, for example, employing a wide-angle type light-emitting unit (11), thereby making it possible to further facilitate adjustment of the detection sensitivity.

[0170] In the smoke detection device (1) according to the fifteenth aspect, in any of the first to third aspects, the substrate (10) has a conductive pattern portion (15) arranged to surround at least one of the light-emitting portion (11) and the light-receiving portion (12).

[0171] According to this aspect, the substrate (10) has the conductive pattern portion (15), so that at least one of the supply of power to the light-emitting portion (11) and the output of an electrical signal from the light-receiving portion (12) can be performed.

[0172] A detector (30) according to a sixteenth aspect includes a housing (2) having an opening (21) and the smoke detection device (1) according to any one of the first to fifteenth aspects. At least a portion of the smoke detection device (1) is housed in the opening (21) of the housing (2).

[0173] According to this aspect, it is possible to facilitate adjustment of the smoke detection sensitivity.

[0174] A detection system (100) according to a seventeenth aspect includes the detector (30) according to the sixteenth aspect and a communication device (20) that communicates with the detector (30).

[0175] According to this aspect, it is possible to facilitate adjustment of the smoke detection sensitivity.

[0176] DESCRIPTION OF SYMBOLS 1 Smoke detection device 10 Substrate 10A Main surface 11 Light-emitting section 12 Light-receiving section 111 First optical member 111Ra Refraction member 111Re Reflection member 111Sd Light-shielding member 121 Second optical member 121Ra Refraction member 121Re Reflection member 121Sd Light-shielding member 13 Cover 131 First cover 131a First hole 132 Second cover 132a Second hole 14 Support member 143 Second mounting section 15 Conductive pattern section 2 Housing 21 Opening 20 Communication device 30 Detector 100 Detection system Vd1 Gap Da1 Detection area Og1 Emitted light Sc1 Scattered light Or1 Emitting range Ir1 Incident range

Claims

1. A smoke detection device comprising: a substrate; a light-emitting unit surface-mounted on a main surface side of the substrate; a light-receiving unit surface-mounted on the main surface side of the substrate; a first optical member provided on the light-emitting side of the light-emitting unit; and a second optical member provided on the light-receiving side of the light-receiving unit, wherein there is an air gap between the first optical member and the second optical member.

2. A smoke detection device as described in claim 1, wherein the first optical member directs at least a portion of the light emitted from the light-emitting unit toward a detection area within the gap, and the second optical member directs at least a portion of the scattered light generated in the detection area within the gap toward the light-receiving unit.

3. A smoke detection device as described in claim 2, wherein the first optical member directs at least a portion of the light emitted from the light-emitting unit toward the detection area by at least one of changing the path of the light emitted from the light-emitting unit and blocking light emitted from the light-emitting unit that is directed outside the detection area, and the second optical member directs at least a portion of the scattered light generated in the detection area toward the light-receiving unit by at least one of changing the path of the scattered light generated in the detection area and blocking light directed toward the light-receiving unit other than the scattered light generated in the detection area.

4. A smoke detection device as claimed in any one of claims 1 to 3, further comprising a first cover that covers the light-emitting unit, the first cover having a first hole between the light-emitting unit and the first optical member that allows light emitted by the light-emitting unit to pass through.

5. A smoke detection device as claimed in any one of claims 1 to 4, further comprising a second cover that covers the light receiving unit, the second cover having a second hole between the light receiving unit and the second optical member that allows light incident on the light receiving unit to pass through.

6. A smoke detection device as claimed in any one of claims 1 to 3, further comprising a cover having a first cover that covers the light-emitting unit and a second cover that covers the light-receiving unit, wherein the first cover has a first hole between the light-emitting unit and the first optical member through which light emitted from the light-emitting unit passes, and the second cover has a second hole between the light-receiving unit and the second optical member through which light incident on the light-receiving unit passes, and the first cover and the second cover are integral.

7. The smoke detection device of claim 6, wherein the cover further comprises a first mounting portion for mounting the cover to the substrate.

8. A smoke detection device according to any one of claims 1 to 3, further comprising a support member that supports the first optical member and the second optical member.

9. A smoke detection device as described in claim 7, further comprising a support member that supports the first optical member and the second optical member, the support member having a second mounting portion for mounting the support member to the cover.

10. A smoke detection device according to any one of claims 1 to 3, wherein at least one of the first optical member and the second optical member includes a refractive member that refracts light.

11. A smoke detection device according to any one of claims 1 to 3, wherein at least one of the first optical member and the second optical member includes a reflective member that reflects light.

12. A smoke detection device according to any one of claims 1 to 3, wherein at least one of the first optical member and the second optical member includes a light-blocking member that blocks part of light.

13. A smoke detection device as claimed in any one of claims 1 to 3, wherein at least one of the first optical member and the second optical member includes a composite member that combines two or more of the following: a refractive member that refracts light, a reflective member that reflects light, and a light-shielding member that blocks part of light.

14. The smoke detection device according to claim 13, wherein the composite member includes a member that combines either one of the refractive member or the reflective member with the light-blocking member.

15. A smoke detection device according to any one of claims 1 to 3, wherein the substrate has a conductive pattern portion provided so as to surround at least one of the light-emitting portion and the light-receiving portion.

16. A detector comprising: a housing having an opening; and a smoke detection device according to any one of claims 1 to 15, wherein at least a portion of the smoke detection device is housed in the opening of the housing.

17. A detection system comprising: a detector according to claim 16; and a communication device for communicating with said detector.

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