Smoke detection device, sensor device, and sensor system

Abstract

To facilitate the adjustment of smoke detection sensitivity. [Solution] The smoke detection device 1 comprises a housing H1, a light-emitting unit 11, and a light-receiving unit 12. The light-emitting unit 11 irradiates light into a detection space S1 within the housing H1. The light-receiving unit 12 receives light within a light-receiving range Ir1 that includes at least a part of the irradiation range Or1 of the light-emitting unit 11 within the detection space S1. The light-emitting unit 11 has a light-emitting element 1A and a first mounting substrate 1C including a first mounting surface 1Ca on which the light-emitting element 1A is mounted. The light-receiving unit 12 has a light-receiving element 2A and a second mounting substrate 2C including a second mounting surface 2Ca on which the light-receiving element 2A is mounted. The second mounting substrate 2C is either the same substrate as the first mounting substrate 1C or a different substrate from the first mounting substrate 1C. In the smoke detection device 1, the irradiation range Or1 is asymmetrical with respect to the central axis D1 of the light-emitting unit 11 which is perpendicular to the first mounting surface 1Ca, and / or the light-receiving range Ir1 is asymmetrical with respect to the central axis D2 of the light-receiving unit 12 which is perpendicular to the second mounting surface 2Ca.

Description

Technical Field

[0001] The present disclosure generally relates to a smoke detection device, a sensor device, and a sensor system. More specifically, the present disclosure relates to a smoke detection device including a light emitting unit and a light receiving unit, a sensor device including the smoke detection device, and a sensor system.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the optical smoke detector (smoke detection device) of Patent Document 1, it is considered that the smoke detection sensitivity changes depending on the ratio of the measurement volume occupied in the measurement chamber. Therefore, for example, by changing the height of the low wall between the light emitter (light emitting unit) and the light receiver (light receiving unit), it is conceivable to adjust the ratio of the measurement volume occupied in the measurement chamber and adjust the smoke sensing sensitivity. However, it is not easy to adjust the smoke sensing sensitivity only by changing the height of the low wall.

[0005] In view of the above reasons, the present disclosure is made, and an object thereof is to provide a smoke detection device, a sensor device, and a sensor system that facilitate adjustment of smoke detection sensitivity. [Means for solving the problem]

[0006] A smoke detection device according to one aspect of the present disclosure comprises a housing, a light-emitting unit, and a light-receiving unit. The light-emitting unit irradiates light into a detection space within the housing. The light-receiving unit receives light within a light-receiving range that includes at least a portion of the irradiation range of the light-emitting unit within the detection space. The light-emitting unit has a light-emitting element and a first mounting substrate including a first mounting surface on which the light-emitting element is mounted. The light-receiving unit has a light-receiving element and a second mounting substrate including a second mounting surface on which the light-receiving element is mounted. The second mounting substrate is the same substrate as the first mounting substrate, or a different substrate from the first mounting substrate. In the smoke detection device, the irradiation range is asymmetrical with respect to the central axis of the light-emitting unit perpendicular to the first mounting surface, and / or the light-receiving range is asymmetrical with respect to the central axis of the light-receiving unit perpendicular to the second mounting surface.

[0007] A sensor device according to one aspect of the present disclosure comprises the above-mentioned smoke detection device and a housing for housing the smoke detection device.

[0008] A sensor system according to one aspect of this disclosure comprises the above-mentioned sensor device and a receiving device that communicates with the sensor device. [Effects of the Invention]

[0009] According to this disclosure, there is an advantage in that the smoke detection sensitivity can be easily adjusted. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of a smoke detection device according to one embodiment. [Figure 2] Figure 2 is a perspective view of the smoke detection device shown above, seen from below. [Figure 3] Figure 3 is a side view of the light-emitting section of the smoke detection device described above. [Figure 4]Figure 4 is a conceptual diagram showing the illumination range of the light-emitting part of the smoke detection device described above, viewed from diagonally above. [Figure 5] Figure 5 is a conceptual diagram showing the illumination range of the light-emitting part of the smoke detection device described above, as viewed from directly below. [Figure 6] Figure 6 is a conceptual diagram showing the illumination range of the light-emitting part of the comparative example smoke detection device, viewed from diagonally above. [Figure 7] Figure 7 is a conceptual diagram showing the illumination range of the light-emitting part of the comparative example smoke detection device as viewed from directly below. [Figure 8] Figure 8 is a conceptual diagram of the illumination range and light reception range of the light-emitting unit and light-receiving unit in a smoke detection device according to one embodiment, when viewed along the normal direction of the substrate. [Figure 9] Figure 9 is a schematic conceptual diagram showing a detector (sensor device) equipped with the smoke detection device described above. [Figure 10] Figure 10 is a block diagram of a sensor system comprising the detector and communication device (receiving device) described above. [Figure 11] Figure 11 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the modified example 1 of the smoke detection device described above. [Figure 12] Figure 12 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the smoke detection device described above in Modification 2. [Figure 13] Figure 13 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the modified example 3 of the smoke detection device described above. [Figure 14] Figure 14 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the modified smoke detection device described above (modification 4). [Figure 15] Figure 15 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the modified example 5 of the smoke detection device described above. [Figure 16] Figure 16 is a conceptual diagram showing the illumination range of the light-emitting part and the light-receiving range of the light-receiving part within the housing of the modified example 6 of the smoke detection device described above. [Figure 17]FIG. 17 is a conceptual diagram of a light emitting unit in the housing in Modification 7 according to the same smoke detection device. [Figure 18] FIG. 18 is a conceptual diagram of a light emitting unit in Modification 8 according to the same smoke detection device.

Embodiments for Carrying Out the Invention

[0011] (Overview) Hereinafter, a smoke detection device, a sensor device, and a sensor system according to embodiments and modifications will be described with reference to the drawings. Note that the following embodiments and modifications are merely one of various embodiments of the present disclosure. Further, the following embodiments and modifications can be variously changed according to design and the like as long as the object of the present disclosure can be achieved. Also, the configurations of the following modifications can be appropriately combined with the following embodiments or other modifications. In addition, the drawings described in the present disclosure are schematic diagrams, and the respective ratios of the sizes and thicknesses of the respective components in the drawings do not necessarily reflect the actual dimensional ratios.

[0012] As shown in FIG. 1, a smoke detection device 1 according to one aspect includes a housing H1, a light emitting unit 11, and a light receiving unit 12. The light emitting unit 11 irradiates light onto a detection space S1 within the housing H1. The light receiving unit 12 receives light within a light receiving range Ir1 that includes at least a part of the irradiation range Or1 of the light emitting unit 11 within the detection space S1. The range where the irradiation range Or1 and the light receiving range Ir1 overlap may hereinafter be referred to as a detection region Da1 (see FIG. 1).

[0013] As shown in Figures 1 and 3, the light-emitting unit 11 includes a light-emitting element 1A and a first mounting substrate 1C including a first mounting surface 1Ca on which the light-emitting element 1A is mounted. As shown in Figure 1, the light-receiving unit 12 includes a light-receiving element 2A and a second mounting substrate 2C including a second mounting surface 2Ca on which the light-receiving element 2A is mounted. The second mounting substrate 2C is either the same substrate as the first mounting substrate 1C or a different substrate from the first mounting substrate 1C. In the smoke detection device 1, the irradiation range Or1 is asymmetrical with respect to the central axis D1 of the light-emitting unit 11 perpendicular to the first mounting surface 1Ca, and / or the light-receiving range Ir1 is asymmetrical with respect to the central axis D2 of the light-receiving unit 12 perpendicular to the second mounting surface 2Ca. In the following description, the characteristic that the irradiation range Or1 is asymmetrical with respect to the central axis D1 of the light-emitting unit 11 perpendicular to the first mounting surface 1Ca may be referred to as the "asymmetric irradiation characteristic". Furthermore, in the following explanation, the characteristic in which the light-receiving range Ir1 is asymmetrical with respect to the central axis D2 of the light-receiving unit 12 perpendicular to the second mounting surface 2Ca may be referred to as "asymmetric light-receiving characteristics." In short, the smoke detection device 1 has at least one of asymmetric irradiation characteristics and asymmetric light-receiving characteristics.

[0014] According to the configuration of the smoke detection device 1 described above, the smoke detection device 1 has at least one of asymmetric irradiation characteristics and asymmetric light reception characteristics, making it easy to adjust the ratio of the overlapping range (detection area Da1) between the irradiation range Or1 and the light reception range Ir1 within the detection space S1. As a result, the smoke detection device 1 has the advantage of making it easier to adjust the smoke detection sensitivity.

[0015] In the following embodiments, it is assumed that the smoke detection device 1 has both asymmetric irradiation characteristics and asymmetric light reception characteristics, but it may also have only asymmetric irradiation characteristics or only asymmetric light reception characteristics.

[0016] Furthermore, in the following embodiments, as an example, it is assumed that the second mounting substrate 2C is a different substrate from the first mounting substrate 1C, as shown in Figure 1. However, the second mounting substrate 2C may be the same substrate as the first mounting substrate 1C.

[0017] (detail) (1) Overall structure The smoke detection device 1, sensor device (detector 30), and sensor system 100 according to this embodiment will be described in detail below with reference to Figures 1 to 10.

[0018] As shown in Figure 10, the sensor system 100 includes a sensor device (here, a detector 30) and a receiving device (here, a communication device 20) that communicates with the sensor device (detector 30). The communication device 20 is connected to the detector 30 wirelessly via, for example, a network 200 (see Figure 10), and receives a signal from the detector 30 indicating that smoke has been detected (for example, a fire detection signal). The communication method between the communication device 20 and the detector 30 is not limited to wireless; it may also be wired. The communication device 20 may be, for example, a receiver for an automatic fire alarm system. Although only one detector 30 is shown in Figure 10, the number of detectors 30 in the sensor system 100 is not particularly limited, and it may include one or more detectors 30.

[0019] The detector 30 can be installed, for example, on the ceiling or wall of a facility such as a house or commercial building. As shown in Figure 9, the detector 30 (sensor device) comprises a smoke detection device 1 and a housing 2 that houses the smoke detection device 1.

[0020] In the following explanation, for the sake of clarity, we may define the vertical direction assuming that the detector 30 is installed on the ceiling. In Figure 9, the direction in which the smoke detection device 1 and the housing 2 are aligned corresponds to the vertical direction, with the side of the housing 2 where the smoke detection device 1 is located being referred to as the "lower side," and the opposite side as the "upper side." The detector 30 can be installed on the ceiling in such a manner that the upper surface of the housing 2 faces the ceiling. However, this definition of direction is not intended to limit the usage of the detector 30.

[0021] The smoke detection device 1 is, for example, a so-called scattered light type smoke detection device. As shown in Figure 1, the smoke detection device 1 comprises a light-emitting unit 11 and a light-receiving unit 12. When smoke (smoke particles Sp1: see Figure 1) is present inside the smoke detection device 1, the light emitted from the light-emitting unit 11 that is scattered by the smoke particles Sp1 enters the light-receiving unit 12, thereby detecting the smoke. The detector 30 transmits a fire detection signal to the communication device 20 according to the smoke detection result by the smoke detection device 1.

[0022] The storage enclosure 2 (see Figure 9) has an opening 21 on its lower side. In the example shown in Figure 9, the storage enclosure 2 houses the smoke detection device 1 in such a manner that the upper part of the smoke detection device 1 is inserted into the opening 21.

[0023] Furthermore, as shown in Figure 10, the detector 30 further includes a communication unit 17 and a gas detection unit 18. The communication unit 17 has a communication interface for wireless communication with the communication device 20. The gas detection unit 18 is housed in the housing 2. The gas detection unit 18 detects gas. Specifically, the gas detection unit 18 detects gas leaks or the generation of CO (carbon monoxide) due to incomplete combustion. The detector 30 transmits a gas detection signal to the communication device 20 according to the gas detection result from the gas detection unit 18. Note that the gas detection unit 18 is not essential, and the detector 30 does not need to be equipped with a gas detection unit 18.

[0024] (2) Detailed configuration of the smoke detection device As shown in Figure 1, the smoke detection device 1 comprises a substrate 10, a light-emitting unit 11, a light-receiving unit 12, a detection unit 16 (see Figure 10), a housing H1, and a light-shielding unit 161.

[0025] As shown in Figure 2, the substrate 10 is a rectangular plate. The substrate 10 is a printed circuit board with a conductive pattern printed on its mounting surface 10A (see Figure 1: bottom surface). The light-emitting unit 11 is surface-mounted on the mounting surface 10A of the substrate 10. The light-receiving unit 12 is also surface-mounted on the mounting surface 10A of the substrate 10. In other words, both the light-emitting unit 11 and the light-receiving unit 12 are surface-mounted on the substrate 10. The substrate 10 is attached to the top of the housing H1 (cover 13: see Figure 2). However, the cover 13 is provided with window holes for leading out the light-emitting unit 11 and the light-receiving unit 12, so that when the substrate 10 is attached to the top of the housing H1, parts of the light-emitting unit 11 and the light-receiving unit 12 (lenses L1 and L2, described later) are exposed inside the housing H1.

[0026] The light-emitting unit 11 irradiates light into the detection space S1 (see Figure 1) inside the housing H1. As shown in Figures 1 and 3, the light-emitting unit 11 includes a light-emitting element 1A and a first mounting substrate 1C which includes a first mounting surface 1Ca (in this case, the bottom surface) on which the light-emitting element 1A is mounted.

[0027] The detection space S1 is a space within the housing H1 that allows external air to enter and exit, and is free from barriers or other structural elements. The detection space S1 is formed by the air gap Vd1 (see Figure 8) between the light-emitting unit 11 and the light-receiving unit 12.

[0028] The light-emitting unit 11 is a surface-mount type light-emitting module. The light-emitting unit 11 is, for example, a package-type light-emitting module (package LED: light-emitting diode). The light-emitting element 1A is, for example, a chip-type LED element. There is one light-emitting element 1A. However, there may be two or more light-emitting elements 1A.

[0029] The first mounting substrate 1C is a rectangular plate. The first mounting substrate 1C is provided with electrodes (lead frames) to which the light-emitting element 1A, surface-mounted on the first mounting surface 1Ca, is connected by bonding wires or the like. The lead frames of the first mounting substrate 1C are joined to the conductive pattern on the mounting surface 10A of the substrate 10, thereby electrically connecting the light-emitting element 1A to the substrate 10. The light-emitting unit 11 receives power through the conductive pattern formed on the substrate 10 and emits light corresponding to the power. The optical axis C1 of the light-emitting element 1A (see Figure 3) is perpendicular to the mounting surface 10A of the substrate 10. The light-emitting unit 11 emits light that propagates away from the mounting surface 10A of the substrate 10.

[0030] The light-emitting unit 11 further includes a first optical member 1B (see Figures 1 and 3) that controls the light distribution of the light-emitting element 1A. In particular, as an example, the first optical member 1B includes a lens L1 (see Figure 3).

[0031] The lens L1 is fixed to the first mounting substrate 1C so as to cover at least the light-emitting element 1A. The lens L1 has a convex lens surface on its lower side. The lens L1 has a recess that is indented downwards on its upper side, and the light-emitting element 1A, which is surface-mounted on the first mounting surface 1Ca, is housed within this recess.

[0032] The illumination range Or1 of the light-emitting unit 11 (see Figures 1, 4, and 5) is the range through which light emitted from the light-emitting unit 11 can pass. Here, as described above, the smoke detection device 1 has an asymmetric illumination characteristic in which "the illumination range Or1 is asymmetric with respect to the central axis D1 of the light-emitting unit 11 (see Figures 1, 4, and 5: virtual axis) perpendicular to the first mounting surface 1Ca." The central axis D1 passes through, for example, the vertex of the convex lens surface of the lens L1. Also, the central axis D1 passes through, for example, the center of the first mounting substrate 1C in a plan view.

[0033] Here, as an example, the "asymmetry" of the illumination range Or1 is achieved by positioning the light-emitting element 1A offset from the center of the first mounting substrate 1C in a plan view. In other words, when viewed along the central axis D1 of the light-emitting section 11, the center of the lens L1 (here, the vertex of the convex lens surface) and the center of the light-emitting element 1A are separated from each other. That is, the optical axis C1 of the light-emitting element 1A (see Figure 3) is parallel to the central axis D1 passing through the vertex of the convex lens surface of the lens L1, but is offset from this central axis D1. Therefore, as shown in Figure 3, the light from the light-emitting element 1A (see the light rays in Figure 3) is emitted in a direction biased to one side through the lens L1, thereby achieving the "asymmetry" of the illumination range Or1. In the example in Figure 1, the light-emitting element 1A is offset from the central axis D1 in the direction away from the light-receiving section 12.

[0034] Furthermore, the "asymmetry" of the irradiation range Or1 is not limited to being achieved by the optical axis C1 of the light-emitting element 1A being offset from the central axis D1. For example, as in the configuration of Modification 8 described later, if the lens surface of the lens L1 is surface-treated to emit light in a direction biased to one side, the "asymmetry" of the irradiation range Or1 can be achieved even if the optical axis C1 of the light-emitting element 1A coincides with the central axis D1.

[0035] Figure 3 illustrates, for convenience, the three axes (x-axis, y-axis, and z-axis) of a non-physical three-dimensional Cartesian coordinate system. The z-axis is parallel to the vertical direction and coincides with the central axis D1. The x-axis is parallel to the longitudinal direction of the first mounting substrate 1C. The y-axis is parallel to the width direction of the first mounting substrate 1C. In the example in Figure 3, the light-emitting element 1A is positioned towards the positive side of the y-axis with respect to the central axis D1, so that the light from the light-emitting element 1A is emitted via the lens L1 at an angle to the negative side of the y-axis with respect to the central axis D1. As shown in Figure 8, when the light-emitting section 11 and the light-receiving section 12 are viewed along the normal direction of the substrate 10, the light-emitting section 11 (first mounting substrate 1C) is positioned such that its longitudinal direction (direction of the x-axis) is oblique to the direction in which the light-emitting section 11 and the light-receiving section 12 are aligned.

[0036] Figures 4 and 5 show conceptual diagrams of the illumination range Or1 of the light-emitting unit 11 when the light from the light-emitting unit 11 is shone onto a virtual plane. Figure 4 shows the illumination range Or1 of the light-emitting unit 11 when viewed from diagonally above, and Figure 5 shows the illumination range Or1 of the light-emitting unit 11 when viewed from directly below. The illumination range Or1 is an oblique cone shape with an elliptical base (shown by dot hatching) on ​​the virtual plane. Figures 1, 4, and 5 exemplify the emitted light Og1 passing through the central axis Ax1 (see Figure 8) of the oblique cone-shaped illumination range Or1.

[0037] On the other hand, Figures 6 and 7 show conceptual diagrams of the illumination range Or1X of the light-emitting unit 11X when the light from the comparative example's light-emitting unit 11X is shone onto a virtual plane. Figure 6 shows the illumination range Or1X of the light-emitting unit 11X when viewed from diagonally above, and Figure 7 shows the illumination range Or1X of the light-emitting unit 11X when viewed from directly below. The illumination range Or1X is a right-circular cone with a circular base (shown by dot hatching) on ​​the virtual plane. Figure 6 exemplifies the emitted light Og1X passing through the center line of the right-circular cone-shaped illumination range Or1X. The light-emitting element of the light-emitting unit 11X is surface-mounted on the mounting substrate at a position through which the central axis D1X passes. In other words, the optical axis of the light-emitting element of the light-emitting unit 11X is located at a position that coincides with the central axis D1X.

[0038] As shown in Figures 6 and 7, the irradiation range Or1X of the comparative example light-emitting unit 11X can be said to be symmetric with respect to the central axis D1X of the light-emitting unit 11X. In other words, the irradiation range Or1X of the light-emitting unit 11X can also be said to be symmetric with respect to the optical axis of the light-emitting element of the light-emitting unit 11X. In contrast, as shown in Figures 4 and 5, the irradiation range Or1 of the light-emitting unit 11 can be said to be asymmetric with respect to the central axis D1 of the light-emitting unit 11. In other words, the irradiation range Or1 of the light-emitting unit 11 can also be said to be asymmetric with respect to the optical axis C1 (parallel to the z-axis) of the light-emitting element 1A.

[0039] Because the smoke detection device 1 has asymmetric irradiation characteristics, the irradiation range Or1 of the light-emitting unit 11 tends to overlap with the light-receiving range Ir1 of the light-receiving unit 12 within the detection space S1, making it easier to adjust the detection area Da1.

[0040] The light-receiving unit 12 receives light within a light-receiving range Ir1 that includes at least a portion of the illumination range Or1 of the light-emitting unit 11 within the detection space S1 (see Figure 1). As shown in Figure 1, the light-receiving unit 12 includes a light-receiving element 2A and a second mounting substrate 2C that includes a second mounting surface 2Ca (in this case, the bottom surface) on which the light-receiving element 2A is mounted.

[0041] The light-receiving unit 12 is a surface-mount type light-receiving module. The light-receiving unit 12 is, for example, a package-type light-receiving module. The light-receiving element 2A is, for example, a photodiode element. The light-receiving element 2A receives light traveling toward the mounting surface 10A of the substrate 10 and converts it into an electrical signal. There is one light-receiving element 2A. However, there may be two or more light-receiving elements 2A.

[0042] The second mounting substrate 2C is a rectangular plate. The second mounting substrate 2C is a different substrate (i.e., a separate substrate) from the first mounting substrate 1C. The second mounting substrate 2C is provided with electrodes (lead frames) to which the photodetector 2A, surface-mounted on the second mounting surface 2Ca, is connected. The lead frames of the second mounting substrate 2C are joined to the conductor pattern on the mounting surface 10A of the substrate 10, thereby electrically connecting the photodetector 2A to the substrate 10. The optical axis of the photodetector 2A is perpendicular to the mounting surface 10A of the substrate 10.

[0043] The light-receiving unit 12 further includes a second optical member 2B (see Figure 1) that controls the light distribution of the light received by the light-receiving element 2A. Here, as an example, the second optical member 2B includes a lens L2 (see Figure 1).

[0044] The lens L2 is fixed to the second mounting substrate 2C so as to cover at least the photodetector 2A. The lens L2 has a convex lens surface on its lower side. On its upper side, the lens L2 has a recess that is indented downwards, and the photodetector 2A, which is surface-mounted on the second mounting surface 2Ca, is housed within this recess.

[0045] The light-receiving range Ir1 (see Figure 1) of the light-receiving unit 12 is the range through which light incident on the light-receiving unit 12 can pass. The light-receiving unit 12 (light-receiving element 2A) receives light scattered by smoke particles Sp1 within the detection area Da1 (the area where the irradiation area Or1 and the light-receiving range Ir1 overlap) from the light emitted from the light-emitting unit 11 (scattered light Sc1: see Figure 1), and converts it into an electrical signal corresponding to the amount of scattered light Sc1. This electrical signal can be said to be, for example, a signal corresponding to the smoke concentration. The light-receiving unit 12 outputs an electrical signal corresponding to the smoke concentration to the detection unit 16 via a conductive pattern formed on the substrate 10. The light-receiving unit 12 may also output an electrical signal to the detection unit 16 indicating that smoke has been detected.

[0046] Here, the smoke detection device 1 has an asymmetric light-receiving characteristic, as described above, in that "the light-receiving range Ir1 is asymmetric with respect to the central axis D2 (see Figure 1: virtual axis) of the light-receiving section 12 which is perpendicular to the second mounting surface 2Ca." The central axis D2 passes through, for example, the vertex of the convex lens surface of the lens L2. Also, the central axis D2 passes through, for example, the center of the second mounting substrate 2C in a plan view.

[0047] Here, as an example, the "asymmetry" of the light-receiving range Ir1 is achieved by positioning the light-receiving element 2A offset from the center of the second mounting substrate 2C in a plan view. In other words, when viewed along the central axis D2 of the light-receiving unit 12, the center of the lens L2 (here, the vertex of the convex lens surface) and the center of the light-receiving element 2A are separated from each other. That is, the optical axis of the light-receiving element 2A is parallel to the central axis D2 passing through the vertex of the convex lens surface of the lens L2, but is offset from this central axis D2. Therefore, even light traveling diagonally from the detection area Da1 (scattered light Sc1) is more likely to be directed towards the light-receiving element 2A via the lens L2. The light-receiving range Ir1 is also obliquely conical, similar to the illumination range Or1 shown in Figures 4 and 5. In the example in Figure 1, the light-receiving element 2A is offset from the central axis D2 in the direction away from the light-emitting unit 11. Furthermore, in the example shown in Figure 1, scattered light Sc1 passing through the central axis Ax2 (see Figure 8) of the oblique cone-shaped light-receiving range Ir1 is illustrated.

[0048] Furthermore, the "asymmetry" of the light-receiving range Ir1 is not limited to being achieved by the optical axis of the light-receiving element 2A being offset from the central axis D2. For example, by surface-processing the lens surface of the lens L2 to create a configuration that receives light from a direction biased to one side, the "asymmetry" of the light-receiving range Ir1 can be achieved even if the optical axis of the light-receiving element 2A coincides with the central axis D2.

[0049] Because the smoke detection device 1 has asymmetric light-receiving characteristics, the light-receiving range Ir1 of the light-receiving unit 12 is more likely to overlap with the irradiation range Or1 of the light-emitting unit 11 within the detection space S1, making it easier to adjust the detection area Da1.

[0050] Incidentally, as shown in Figure 8, the central axis Ax1 of the irradiation range Or1 and the central axis Ax2 of the light-receiving range Ir1 intersect each other at an angle within the range of 90 to 120 degrees (for example, 100 degrees) when viewed from the direction of the central axis D1 (in other words, the normal direction of the mounting surface 10A of the substrate 10). Therefore, selective detection of scattered light Sc1 by smoke particles Sp1 becomes easier, and the smoke detection sensitivity can be improved.

[0051] The detection unit 16 (see Figure 10) includes, for example, a computer system having one or more processors and memory. At least some of the functions of the detection unit 16 are realized by the computer system's processor executing a program recorded in the computer system's memory. The program may be recorded in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card.

[0052] The detection unit 16 is provided, for example, on the substrate 10. Based on the electrical signal from the light receiving unit 12, the detection unit 16 detects the presence of smoke particles Sp1 caused by a fire or the like in the detection space S1 and transmits a fire detection signal from the communication unit 17 to the communication device 20. The detection unit 16 may also be capable of measuring the amount (e.g., concentration) of smoke present in the detection space S1 based on the electrical signal from the light receiving unit 12.

[0053] As shown in Figure 2, the housing H1 has a cover 13 and a case 14.

[0054] The cover 13 is a roughly disc-shaped portion. The cover 13 is attached to the substrate 10. The cover 13 covers the light-emitting unit 11 and the light-receiving unit 12 mounted on the substrate 10 from below. The cover 13 has a pair of window holes into which the light-emitting unit 11 and the light-receiving unit 12 are inserted, exposing at least lenses L1 and L2 to the detection space S1 below. The presence of the cover 13 helps to suppress noise caused by light other than the light emitted by the light-emitting unit 11 (for example, light from outside the smoke detection device 1) entering the detection space S1. Furthermore, the presence of the cover 13 helps to suppress noise caused by light other than scattered light generated in the detection area Da1 (for example, light from outside the smoke detection device 1) entering the light-receiving unit 12.

[0055] Case 14 is a roughly cylindrical portion with an open top. Case 14 is attached to cover 13 such that the open top surface is covered by cover 13. Case 14 has a plurality of labyrinths 144, as shown in Figure 2. The plurality of labyrinths 144 are arranged in a circle to surround the gap Vd1 (see Figure 8), i.e., the detection space S1. Each of the plurality of labyrinths 144 has a V shape when viewed from the direction normal to the mounting surface 10A of the substrate 10, and the apex corresponding to the tip of the V-shape faces the same direction in the circumferential direction (for example, clockwise or counterclockwise). In this way, by arranging multiple V-shaped labyrinths 144 in a circular pattern surrounding the void Vd1 and in the same direction circumferentially, it is possible to suppress the intrusion of external light into the void Vd1 while allowing external air to enter and exit the void Vd1 through the gaps between adjacent labyrinths 144.

[0056] The light-shielding portion 161 (see Figure 1) is positioned between the light-emitting portion 11 and the light-receiving portion 12 to suppress light emitted from the light-emitting portion 11 from directly entering the light-receiving portion 12. The light-shielding portion 161 is provided, for example, on the lower surface of the cover 13 (not shown in Figure 1). The light-shielding portion 161 may be, for example, a wall formed continuously and integrally with the lower surface of the cover 13. As shown in Figure 1, it is preferable that the irradiation range Or1 and the light-receiving range Ir1 are set so as not to overlap with the light-shielding portion 161. By providing the light-shielding portion 161, false detection of smoke caused by light emitted from the light-emitting portion 11 directly entering the light-receiving portion 12 can be suppressed.

[0057] (3) Method for detecting smoke In this embodiment, as shown in Figure 1, when smoke particles Sp1 are present in the detection region Da1, the light emitted from the light-emitting unit 11 in the irradiation range Or1 (emission range) (emission light Og1) is scattered by the smoke particles Sp1. Of the scattered light, the light that travels through the light-receiving range Ir1 (incident range) (scattered light Sc1) is incident on the light-receiving unit 12. 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 the detection of the presence of smoke particles Sp1 in the detection region Da1.

[0058] (4) Advantages The smoke detection device 1 according to this embodiment has at least one of asymmetric irradiation characteristics and asymmetric light reception characteristics. Therefore, for example, by adjusting the distance between the light-emitting unit 11 and the light-receiving unit 12, or by adjusting the orientation of the irradiation range Or1 and the light-receiving range Ir1, it is easy to adjust the proportion of the detection area Da1, which is the overlapping area between the irradiation range Or1 and the light-receiving range Ir1. As a result, it is possible to easily adjust the smoke detection sensitivity.

[0059] Here, "adjustment of detection area Da1" refers to at least one of the following: moving the detection area Da1, or 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 detection space S1. Depending on the installation state of the smoke detection device 1, smoke may be unevenly distributed in a part of the detection space S1. Even in such cases, the smoke detection sensitivity can be improved by moving the detection area Da1 to the unevenly distributed position of the smoke (for example, by adjusting the orientation of the central axis Ax1 of the irradiation range Or1 and the central axis Ax2 of the light receiving range Ir1 in advance).

[0060] Furthermore, the adjustment of the size of the detection area Da1 preferably involves expanding the detection area Da1. By increasing the extent of the irradiation range Or1 and the light reception range Ir1 through asymmetric irradiation and asymmetric light reception characteristics, the detection area Da1 can be expanded, and consequently, the smoke detection sensitivity can be improved.

[0061] Furthermore, for example, even without additional reflective or refracting components around the light-emitting section 11 and / or light-receiving section 12, it is easy to form a detection area Da1 where the illumination area Or1 and the light-receiving area Ir1 overlap. As a result, the number of components can be reduced.

[0062] (5) Variant The following lists modifications of the above embodiment. In the description of the following modifications, elements similar to those in the above embodiment may be given the same reference numerals and their descriptions may be omitted as appropriate.

[0063] (5.1) Variation 1 The following describes the smoke detection device 1 according to Modification 1 with reference to Figure 11.

[0064] The smoke detection device 1 according to Modification 1 further comprises one or more (in this case, one) third optical members E1 disposed between the light-emitting unit 11 and the light-receiving unit 12. The third optical member E1 has a light-receiving unit-side optical member 121 disposed on the light-receiving unit 12 side.

[0065] The optical member 121 on the light-receiving side according to Modification 1 is an optical member for facilitating the incidence of at least a portion of the scattered light Sc1 generated in the detection region Da1 by the light-receiving unit 12. The scattered light Sc1 is generated when light emitted from the light-emitting unit 11 to the irradiation area Or1 enters the detection region Da1 and is scattered by smoke particles Sp1 present in the detection region Da1.

[0066] In Modification 1, as an example, the light-receiving optical member 121 is a lens prism 121Ra (refracting member), as shown in Figure 11. In the example in Figure 11, there is one lens prism 121Ra, but the number of lens prisms 121Ra is not particularly limited and may be two or more. The light-receiving optical member 121 may also include a refractive member other than the lens prism 121Ra. The light-receiving optical member 121 may include one type of optical member from among a refractive member, a reflective member, and a light-shielding member, or a composite member combining two or more types of optical members.

[0067] The lens prism 121Ra has a first surface (here, a convex surface) into which scattered light Sc1, generated by scattering by smoke particles Sp1, is incident; a second surface (here, a flat surface) into which light incident from the first surface undergoes total internal reflection; and a third surface (here, a flat surface) into which the light totally reflected from the second surface is emitted.

[0068] The lens prism 121Ra is held, for example, on the peripheral wall of the case 14, near the lower part of the light-receiving unit 12, with its third surface (emitting surface) facing the light-receiving unit 12. The lens prism 121Ra collects the scattered light Sc1 generated in the detection area Da1 that travels towards the light-receiving unit 12 within the light-receiving range Ir1, and changes its path to a path that is approximately normal to the mounting surface 10A of the substrate 10. Light emitted from the third surface of the 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. In other words, the lens prism 121Ra makes it easier for the light-receiving unit 12 to receive the scattered light Sc1. To put it another way, the path of the scattered light Sc1 is adjusted by the lens prism 121Ra to be along the optical axis of the light-receiving element 2A of the light-receiving unit 12.

[0069] The smoke detection device 1 according to Modification 1 has asymmetric irradiation characteristics. On the other hand, the smoke detection device 1 according to Modification 1 may or may not have asymmetric light reception characteristics.

[0070] According to the configuration of Modified Example 1, the lens prism 121Ra makes it easier to adjust the expansion of the light-receiving range Ir1.

[0071] Furthermore, even if the smoke detection device 1 has an asymmetric illumination characteristic but lacks an asymmetric light reception characteristic, the presence of the lens prism 121Ra makes it easier to adjust the scattered light Sc1 to align more closely with the optical axis of the light-receiving element 2A. In other words, the lens prism 121Ra makes it easier to compensate for the smoke detection device 1's lack of asymmetric light reception characteristics. As a result, it becomes easier to adjust the smoke detection sensitivity.

[0072] Furthermore, even if the smoke detection device 1 has both asymmetric illumination and asymmetric light reception characteristics, the lens prism 121Ra makes it easier to adjust the scattered light Sc1 so that it is more aligned with the optical axis of the light-receiving element 2A. As a result, the adjustment of the smoke detection sensitivity can be made easier.

[0073] Furthermore, the light-receiving optical element 121 may include a simple prism and / or a simple lens instead of (or in addition to) the lens prism 121Ra.

[0074] (5.2) Variation 2 The following describes the smoke detection device 1 according to modified example 2 with reference to Figure 12.

[0075] The smoke detection device 1 according to Modification 2 further comprises one or more (in this case, one) third optical members E1 positioned between the light-emitting unit 11 and the light-receiving unit 12, similar to Modification 1. The third optical member E1 has a light-receiving unit-side optical member 121 positioned on the light-receiving unit 12 side, similar to Modification 1.

[0076] The optical member 121 on the light-receiving side in Modification 2 is an optical member that facilitates the incidence of at least a portion of the scattered light Sc1 generated in the detection region Da1 by the light-receiving unit 12. In Modification 2, as an example, the optical member 121 on the light-receiving side is a reflective member 121Re (reflector) that reflects light, as shown in Figure 12.

[0077] In the example shown in Figure 12, there is one reflective member 121Re, but the number of reflective members 121Re is not particularly limited and may be two or more. The light-receiving optical member 121 may include reflective members other than the reflective member 121Re. The light-receiving optical member 121 may include one type of optical member from among refractive members, reflective members, and light-shielding members, or a composite member combining two or more types of optical members.

[0078] The reflective member 121Re is held, for example, on the peripheral wall of the case 14, near the lower part of the light-receiving unit 12, such that the reflective surface 1210 of the reflective member 121Re faces the light-receiving unit 12 while being inclined with respect to the mounting surface 10A of the substrate 10. Preferably, a reflective film of a metal such as aluminum is formed on the reflective surface 1210 by vapor deposition or the like.

[0079] The reflective member 121Re may be formed as a continuous and integral part of the case 14. For example, the reflective surface 1210 may be formed on a projection that is continuously and integrally formed with the case 14. In the example of Figure 12, the reflective member 121Re is a plane mirror with a flat reflective surface 1210, but it may also be a concave mirror with a concave reflective surface 1210, or a convex mirror with a flat reflective surface 1210.

[0080] The reflective member 121Re changes the path of the scattered light Sc1 generated in the detection region Da1 that travels towards the light receiving unit 12 within the light receiving range Ir1, so that it aligns with the direction approximately normal to the mounting surface 10A of the substrate 10. Therefore, the reflective member 121Re makes it easier for the light receiving unit 12 to receive the scattered light Sc1. In other words, the path of the scattered light Sc1 is adjusted by the reflective member 121Re so that it aligns with the optical axis of the light receiving element 2A of the light receiving unit 12.

[0081] The smoke detection device 1 according to Modification 2 has asymmetric irradiation characteristics. On the other hand, the smoke detection device 1 according to Modification 2 may or may not have asymmetric light reception characteristics.

[0082] According to the configuration of the modified example 2, the reflective member 121Re makes it easier to adjust the expansion of the light-receiving range Ir1.

[0083] Furthermore, even if the smoke detection device 1 has an asymmetric irradiation characteristic but lacks an asymmetric light reception characteristic, the presence of the reflective member 121Re makes it easier to adjust the scattered light Sc1 to align more closely with the optical axis of the light-receiving element 2A. In other words, the reflective member 121Re makes it easier to compensate for the smoke detection device 1's lack of asymmetric light reception characteristics. As a result, it becomes easier to adjust the smoke detection sensitivity.

[0084] Furthermore, even if the smoke detection device 1 has both asymmetric irradiation and asymmetric light reception characteristics, the reflective member 121Re makes it easier to adjust the scattered light Sc1 so that it is more aligned with the optical axis of the light-receiving element 2A. As a result, the adjustment of the smoke detection sensitivity can be made easier.

[0085] (5.3) Modification 3 The following describes the smoke detection device 1 according to modified example 3 with reference to Figure 13.

[0086] The smoke detection device 1 according to Modification 3 further comprises one or more (in this case, one) third optical members E1 positioned between the light-emitting unit 11 and the light-receiving unit 12, similar to Modification 1. The third optical member E1 has a light-receiving unit-side optical member 121 positioned on the light-receiving unit 12 side, similar to Modification 1.

[0087] The optical member 121 on the light-receiving side in Modification 3 is an optical member for blocking a portion of the scattered light Sc1 generated in the detection region Da1 and / or light other than scattered light Sc1 (disturbing light) that is directed toward the light-receiving unit 12. In Modification 3, as an example, the optical member 121 on the light-receiving side is a light-shielding member 121Sd (light-shielding plate), as shown in Figure 13.

[0088] In the example shown in Figure 13, there is one light-shielding member 121Sd, but the number of light-shielding members 121Sd is not particularly limited and may be two or more. The light-receiving optical member 121 may include light-shielding members other than the light-shielding member 121Sd. The light-receiving optical member 121 may include one type of optical member from among a refractive member, a reflective member, and a light-shielding member, or a composite member combining two or more types of optical members.

[0089] The light-shielding member 121Sd is a plate-shaped member. The light-shielding member 121Sd is held, for example, on the peripheral wall of the case 14, near the lower part of the light-receiving section 12, such that the upper surface of the light-shielding member 121Sd faces a part of the light-receiving section 12. The light-shielding member 121Sd may be formed as a continuous and integral part of the case 14.

[0090] The light-shielding member 121Sd may be positioned, for example, so as not to overlap with the light-receiving range Ir1, while blocking light other than scattered light Sc1. Alternatively, the light-shielding member 121Sd may overlap with a portion of the light-receiving range Ir1, thereby narrowing the light-receiving range Ir1.

[0091] In the modified example 3, the smoke detection device 1 preferably has both asymmetric irradiation characteristics and asymmetric light reception characteristics.

[0092] In the configuration of Modified Example 3, the presence of the light-shielding member 121Sd helps to suppress the incidence of light other than scattered light Sc1 (for example, light directed from the outside toward the light-receiving unit 12) into the light-receiving unit 12, thereby suppressing noise caused by the incidence of light other than scattered light Sc1 (disturbing light). Furthermore, the light-shielding member 121Sd can also narrow the light-receiving range Ir1.

[0093] (5.4) Modification 4 The following describes the smoke detection device 1 according to modified example 4 with reference to Figure 14.

[0094] The smoke detection device 1 according to modified example 4 further comprises one or more (in this case, two) third optical members E1 disposed between the light-emitting unit 11 and the light-receiving unit 12. The one or more third optical members E1 have a light-emitting unit-side optical member 111 disposed on the light-emitting unit 11 side and a light-receiving unit-side optical member 121 disposed on the light-receiving unit 12 side so as to be spaced apart from the light-emitting unit-side optical member 111.

[0095] The optical member 121 on the light-receiving side in Modification 4 is the same as the optical member 121 on the light-receiving side in Modification 1 (see Figure 11), so its explanation is omitted here. The optical member 111 on the light-emitting side in Modification 4 is a member for changing the path of light so that at least a portion of the light emitted from the light-emitting unit 11 is directed towards the detection area Da1.

[0096] In Modification 4, both the light-emitting optical member 111 and the light-receiving optical member 121 are lens prisms (111Ra, 121Ra: refractive members). The lens prism 121Ra in Modification 4 is the same as the lens prism 121Ra in Modification 1 (see Figure 11), so its explanation is omitted here. Also, since the lens prism 111Ra in Modification 4 is a component with the same configuration as the lens prism 121Ra, its explanation may be omitted as appropriate.

[0097] In the example shown in Figure 14, there is one lens prism each of 111Ra and 121Ra, but the number of lens prisms is not particularly limited. Each of the light-emitting optical member 111 and the light-receiving optical member 121 may include one type of optical member from among a refractive member, a reflective member, and a light-shielding member, or a composite member combining two or more types of optical members.

[0098] The lens prism 111Ra has a first surface (here, a flat surface) into which the light Og1 emitted from the light-emitting part 11 is incident, a second surface (here, a flat surface) into which the light incident from the first surface undergoes total internal reflection, and a third surface (here, a convex surface) from which the light totally reflected from the second surface is emitted.

[0099] The lens prism 111Ra is held, for example, on the peripheral wall of the case 14, near the lower part of the light-emitting unit 11, with its first surface (incident surface) facing the light-emitting unit 11. The lens prism 111Ra changes the path of the light Og1 emitted from the light-emitting unit 11 so that it is directed toward the detection region Da1. The light emitted from the third surface of the lens prism 111Ra is efficiently scattered by the smoke particles Sp1 present in the detection region Da1. In other words, the lens prism 111Ra makes it easier for the emitted light Og1 to be scattered by the smoke particles Sp1.

[0100] The smoke detection device 1 according to Modification 4 may have both asymmetric irradiation characteristics and asymmetric light reception characteristics, or it may have only one of them.

[0101] According to the configuration of Modified Example 4, the lens prisms 111Ra and 121Ra make it easier to adjust the expansion of the illumination range Or1 and the light-receiving range Ir1. Note that the light-emitting optical member 111 may include a simple prism and / or a simple lens instead of (or in addition to) the lens prism 111Ra. Similarly, the light-receiving optical member 121 may include a simple prism and / or a simple lens instead of (or in addition to) the lens prism 121Ra.

[0102] The third optical member E1 according to modified example 4 may have only the light-emitting optical member 111 and may not have the light-receiving optical member 121. In that case, it is preferable that the smoke detection device 1 has at least asymmetric light-receiving characteristics.

[0103] (5.5) Variation 5 The smoke detection device 1 according to Modification 5 will be described below with reference to Figure 15.

[0104] The smoke detection device 1 according to Modification 5 further comprises one or more (in this case, two) third optical members E1, similar to Modification 4. Each of the one or more third optical members E1 has a light-emitting optical member 111 and a light-receiving optical member 121, similar to Modification 4.

[0105] The optical member 121 on the light-receiving side in Modification 5 is the same as the optical member 121 on the light-receiving side in Modification 2 (see Figure 12), so its explanation is omitted here. The optical member 111 on the light-emitting side in Modification 5 is a member for changing the path of light so that at least a portion of the light emitted from the light-emitting unit 11 is directed towards the detection area Da1.

[0106] In Modification 5, both the light-emitting optical member 111 and the light-receiving optical member 121 are reflective members (111Re, 121Re: reflectors). The reflective member 121Re in Modification 5 is the same as the reflective member 121Re in Modification 2 (see Figure 12), so its explanation is omitted here. Also, since the reflective member 111Re in Modification 5 has the same configuration as the reflective member 121Re, its explanation may be omitted as appropriate.

[0107] In the example shown in Figure 15, there is one reflective member 111Re and one reflective member 121Re, but the number of reflective members is not particularly limited. Each of the light-emitting optical member 111 and the light-receiving optical member 121 may include one type of optical member from among a refractive member, a reflective member, and a light-shielding member, or a composite member combining two or more types of optical members.

[0108] The reflective member 111Re is held, for example, on the peripheral wall of the case 14, so that its reflective surface 1110 faces the light-emitting part 11 in an inclined state with respect to the mounting surface 10A of the substrate 10, near the lower part of the light-emitting part 11. Preferably, a reflective film of a metal such as aluminum is formed on the reflective surface 1110 by vapor deposition or the like.

[0109] The reflective member 111Re may be formed as a continuous and integral part of the case 14. For example, the reflective surface 1110 may be formed on a projection that is continuously and integrally formed with the case 14. In the example of Figure 15, the reflective member 111Re is a plane mirror with a flat reflective surface 1110, but it may also be a concave mirror with a concave reflective surface 1110, or a convex mirror with a flat reflective surface 1110.

[0110] The reflective member 111Re reflects a portion of the light Og1 emitted from the light-emitting unit 11, changing its path so that it is directed towards the detection area Da1. As a result, the light Og1 emitted from the light-emitting unit 11 is efficiently scattered by the smoke particles Sp1 present in the detection area Da1. In other words, the reflective member 111Re makes it easier for the emitted light Og1 to be scattered by the smoke particles Sp1.

[0111] The smoke detection device 1 according to Modification 5 may have both asymmetric irradiation characteristics and asymmetric light reception characteristics, or it may have only one of them.

[0112] According to the configuration of Modified Example 5, the reflective members 111Re and 121Re make it easier to adjust the extent of the illumination range Or1 and the light receiving range Ir1.

[0113] The third optical member E1 according to modified example 5 may have only the light-emitting optical member 111 and may not have the light-receiving optical member 121. In that case, it is preferable that the smoke detection device 1 has at least asymmetric light-receiving characteristics.

[0114] (5.6) Variation 6 The smoke detection device 1 according to modified example 6 will be described below with reference to Figure 16.

[0115] The smoke detection device 1 according to Modification 6 further comprises one or more (in this case, two) third optical members E1, similar to Modification 4. Each of the one or more third optical members E1 has, similar to Modification 4, an optical member 111 on the light-emitting side and an optical member 121 on the light-receiving side.

[0116] The optical member 121 on the light-receiving side in Modification 6 is the same as the optical member 121 on the light-receiving side in Modification 3 (see Figure 13), so its explanation is omitted here. The optical member 111 on the light-emitting side in Modification 6 is an optical member for blocking a portion of the light Og1 emitted from the light-emitting unit 11 and / or light other than the emitted light Og1 (disturbing light).

[0117] In Modification 6, both the light-emitting optical member 111 and the light-receiving optical member 121 are light-shielding members (111Sd, 121Sd: light-shielding plates). The light-shielding member 121Sd in Modification 6 is the same as the light-shielding member 121Sd in Modification 3 (see Figure 13), so its explanation is omitted here. Also, since the light-shielding member 111Sd in Modification 6 has the same configuration as the light-shielding member 121Sd, its explanation may be omitted as appropriate.

[0118] In the example shown in Figure 16, there is one each of the light-shielding members 111Sd and 121Sd, but the number of light-shielding members is not particularly limited. Each of the light-emitting optical member 111 and the light-receiving optical member 121 may include one type of optical member from among the refractive members, reflective members, and light-shielding members, or a composite member combining two or more types of optical members.

[0119] The light-shielding member 111Sd is a plate-shaped member. The light-shielding member 111Sd is held, for example, on the peripheral wall of the case 14, near the lower part of the light-emitting part 11, such that the upper surface of the light-shielding member 111Sd faces a part of the light-emitting part 11. The light-shielding member 111Sd may be formed as a continuous and integral part with the case 14.

[0120] The light-shielding member 111Sd may be positioned, for example, to block light other than the emitted light Og1 while not overlapping with the irradiation range Or1. Alternatively, the light-shielding member 111Sd may overlap with a part of the irradiation range Or1 and be positioned to narrow the irradiation range Or1.

[0121] In the modified example 6, the smoke detection device 1 preferably has both asymmetric irradiation characteristics and asymmetric light reception characteristics.

[0122] According to the configuration of modified example 6, the presence of light-shielding members 111Sd and 121Sd further suppresses noise caused by ambient light. In addition, the light-shielding members 111Sd and 121Sd can also narrow the irradiation range Or1 and the light-receiving range Ir1.

[0123] The third optical member E1 according to modified example 6 may have only the light-emitting optical member 111 and may not have the light-receiving optical member 121.

[0124] (5.7) Variation 7 The following describes the smoke detection device 1 according to modified example 7 with reference to Figure 17.

[0125] In the smoke detection device 1 according to Modification 7, the first mounting surface 1Ca of the first mounting substrate 1C is non-parallel to the mounting surface 10A of the substrate 10 on which the light-emitting unit 11 is surface-mounted. Here, as an example, when the light-emitting unit 11 is surface-mounted on the mounting surface 10A of the substrate 10, the first mounting surface 1Ca is parallel to the normal direction (up and down direction) of the mounting surface 10A. The first mounting surface 1Ca faces the light-receiving unit 12 (not shown in Figure 17). The optical axis C1 of the light-emitting element 1A surface-mounted on the first mounting surface 1Ca (side surface) is parallel to the mounting surface 10A. In short, the optical axis C1 of the light-emitting element 1A is oriented horizontally.

[0126] The smoke detection device 1 according to Modification 7 has asymmetric irradiation characteristics. That is, the optical axis C1 of the light-emitting element 1A is parallel to the central axis D1 passing through the vertex of the convex lens surface of the lens L1, but is positioned offset from the central axis D1. In the example of Figure 17, the light-emitting element 1A is offset from the central axis D1 towards the mounting surface 10A of the substrate 10. Therefore, although the optical axis C1 of the light-emitting element 1A is parallel to the mounting surface 10A, its irradiation range Or1 is asymmetric with respect to the central axis D1 and is oriented in approximately the same direction as the irradiation range Or1 of the smoke detection device 1 of the above embodiment.

[0127] Furthermore, the smoke detection device 1 is equipped with a light-shielding section 161A positioned between the light-emitting section 11 and the light-receiving section 12 to suppress light emitted from the light-emitting section 11 from directly entering the light-receiving section 12.

[0128] The light-shielding portion 161A is provided, for example, on the lower surface of the cover 13 (not shown in Figure 17). The light-shielding portion 161A may be, for example, a wall formed in a continuous and integral manner with the lower surface of the cover 13. In the example in Figure 17, the light-shielding portion 1610 has an inclined surface 1610 such that it moves further away from the light-emitting portion 11 as it moves away from the mounting surface 10A of the substrate 10. It is preferable that the irradiation range Or1 is set so as not to overlap with the light-shielding portion 161A.

[0129] According to the configuration of Modified Example 7, even when the first mounting surface 1Ca is not parallel to the mounting surface 10A, the smoke detection sensitivity can be adjusted more easily. In addition, the presence of the light-shielding section 161A suppresses false detection of smoke caused by light emitted from the light-emitting section 11 directly entering the light-receiving section 12.

[0130] As another example of Modification 7, the optical axis of the light-receiving element 2A of the light-receiving unit 12 may be oriented horizontally. That is, the second mounting surface 2Ca of the second mounting substrate 2C of the light-receiving unit 12 may be non-parallel to the mounting surface 10A of the substrate 10. In that case, when the light-receiving unit 12 is surface-mounted on the mounting surface 10A of the substrate 10, the second mounting surface 2Ca is parallel to the normal direction (up and down direction) of the mounting surface 10A. The second mounting surface 2Ca faces the light-emitting unit 11 side. The optical axis of the light-receiving element 2A surface-mounted on the second mounting surface 2Ca (side surface) is parallel to the mounting surface 10A.

[0131] (5.8) Variation 8 The following describes the smoke detection device 1 according to modified example 8 with reference to Figure 18.

[0132] In the smoke detection device 1 according to modified example 8, the first optical member 1B includes a light-shielding portion 1Ba. The first optical member 1B may also include a reflective portion 1Bb.

[0133] A light-shielding portion 1Ba is provided on a portion of the surface of the lens L1 of the light-emitting portion 11. In the example shown in Figure 18, the light-shielding portion 1Ba is provided on the surface of the lens L1 in a region that is on the optical axis C1 side of the central axis D1. The light-shielding portion 1Ba may also be provided on the surface of the lens L1 in a region that is on the opposite side of the optical axis C1 from the central axis D1 (towards the light-receiving portion 12).

[0134] Alternatively, a reflective portion 1Bb may be provided instead of the light-shielding portion 1Ba, or both the light-shielding portion 1Ba and the reflective portion 1Bb may be provided in a portion of the surface of the lens L1. The light-shielding portion 1Ba and the reflective portion 1Bb may be formed by surface treatment (polishing, etc.) of the lens L1, or by coating treatment on the surface of the lens L1.

[0135] According to the configuration of Modified Example 8, the presence of a light-shielding section 1Ba and / or a reflective section 1Bb makes it easier to adjust the irradiation range Or1, and as a result, it becomes easier to adjust the smoke detection sensitivity.

[0136] Furthermore, with the configuration of Modification 8, even if the optical axis C1 of the light-emitting element 1A coincides with the central axis D1, the "asymmetry" of the irradiation range Or1 can be achieved.

[0137] As another example of Modification 8, the second optical member 2B of the light-receiving unit 12 may include a light-shielding portion, similar to the light-shielding portion 1Ba described above. Also, the second optical member 2B of the light-receiving unit 12 may include a reflective portion, similar to the reflective portion 1Bb described above.

[0138] (5.9) Other variations The light-emitting element 1A of the light-emitting unit 11 is not limited to an LED element, but may be, for example, a laser diode (LD). Similarly, the light-receiving element 2A of the light-receiving unit 12 is not limited to a photodiode element, but may be, for example, a CMOS (Complementary Metal-Oxide-Semiconductor).

[0139] The detection unit 16 may be located outside the smoke detection device 1. For example, the detector 30 may include a smoke detection device 1 equipped with a light-emitting unit 11 and a light-receiving unit 12, and a detection unit 16 provided outside the smoke detection device 1.

[0140] Alternatively, the detector 30 may comprise a smoke detection device 1 having a light-emitting unit 11 and a light-receiving unit 12, and a communication unit 17, while the receiver may comprise a communication device 20 and a 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 generation of smoke in the environment where the detector 30 is installed based on the received electrical signal.

[0141] In the above embodiment, the second mounting substrate 2C is a different substrate from the first mounting substrate 1C. However, the second mounting substrate 2C may be the same substrate as the first mounting substrate 1C. In that case, the light-emitting element 1A and the light-receiving element 2A are mounted on the same substrate.

[0142] The first mounting board 1C may have one or more other electronic components mounted on it in addition to the light-emitting element 1A. The first mounting board 1C may also be a printed circuit board.

[0143] Similarly, the second mounting board 2C may have one or more other electronic components mounted on it in addition to the light-receiving element 2A. The second mounting board 2C may also be a printed circuit board. Furthermore, the second mounting board 2C may be the same board as the first mounting board 1C, and that same board may also be a printed circuit board. The printed circuit board on which the light-emitting element 1A and the light-receiving element 2A are mounted may have one or more other electronic components mounted on it.

[0144] In the above embodiment, both the light-emitting unit 11 and the light-receiving unit 12 are surface-mounted on the substrate 10. However, the light-emitting unit 11 and the light-receiving unit 12 may be surface-mounted on separate substrates.

[0145] Furthermore, the light-emitting unit 11 is not limited to being mounted (directly) on the substrate 10. For example, the light-emitting unit 11 may be surface-mounted on the second mounting substrate 2C of the light-receiving unit 12. In other words, the first mounting substrate 1C on which the light-emitting element 1A is mounted may be mounted on the second mounting substrate 2C of the light-receiving unit 12. The first mounting substrate 1C may be mounted on the second mounting substrate 2C, and the second mounting substrate 2C may be mounted on the substrate 10.

[0146] Furthermore, the light-receiving unit 12 is not limited to being mounted (directly) on the substrate 10. For example, the light-receiving unit 12 may be surface-mounted on the first mounting substrate 1C of the light-emitting unit 11. In other words, the second mounting substrate 2C on which the light-receiving element 2A is mounted may be mounted on the first mounting substrate 1C of the light-emitting unit 11. The second mounting substrate 2C may be mounted on the first mounting substrate 1C, and the first mounting substrate 1C may be mounted on the substrate 10.

[0147] In Modification 1 and Modification 4, the optical member 111 on the light-emitting part side and the optical member 121 on the light-receiving part side were lens prisms (refracting members), but they may also be lenses. The lens may be one of the following types: a condensing lens (e.g., a convex lens) that has a light-gathering function to refract and collect (concentrate) the light from the light-emitting part 11, and a diffusing lens (e.g., a concave lens) that has a light-diffusing function to refract and spread (diffuse) the light from the light-emitting part 11, or a combination of the two types (e.g., a composite lens combining a convex lens and a concave lens). The light-gathering function may be, for example, a function to collect the diffused light from the light-emitting part 11 and make it closer to parallel light. The diffusing function may be, for example, a function to further spread (widen the angle of) the diffused light from the light-emitting part 11.

[0148] In Modification 1 and Modification 4, the light-emitting optical member 111 and the light-receiving optical member 121 were lens prisms (refracting members), but they may also be prisms. For example, a right-angle prism. When the light-emitting optical member 111 is a right-angle prism, the right-angle prism utilizes total internal reflection due to internal reflection at the second surface corresponding to the hypotenuse of an isosceles right triangle, for example, to bend the incident light that enters the first surface from the light-emitting part 11 perpendicularly at a right angle, and emit the exit light perpendicularly from the third surface. However, the angle between the incident light and the exit light only needs to be within the range in which total internal reflection occurs at the second surface.

[0149] The smoke detection device 1 does not necessarily have a cover 13. The circuit board 10 may be mounted directly to the case 14 so as to cover the open top surface of the case 14 instead of the cover 13.

[0150] In each of the modifications 4 to 6, the light-emitting optical member 111 and the light-receiving optical member 121 are of the same type. However, the light-emitting optical member 111 and the light-receiving optical member 121 may be different types of optical members. Specifically, the light-emitting optical member 111 may be a lens prism 111Ra, and the light-receiving optical member 121 may be a reflective member 121Re or a light-shielding member 121Sd. The light-emitting optical member 111 may be a reflective member 111Re, and the light-receiving optical member 121 may be a lens prism 121Ra or a light-shielding member 121Sd. The light-emitting optical member 111 may be a light-shielding member 111Sd, and the light-receiving optical member 121 may be a lens prism 121Ra or a reflective member 121Re.

[0151] Furthermore, the light-emitting optical member 111 may be a composite member containing two or more of the following materials: a lens prism 111Ra, a reflective member 111Re, and a light-shielding member 111Sd. Similarly, the light-receiving optical member 121 may be a composite member containing two or more of the following materials: a lens prism 121Ra, a reflective member 121Re, and a light-shielding member 121Sd. If both the light-emitting optical member 111 and the light-receiving optical member 121 are composite members, the combination of materials may be the same or different.

[0152] In the above embodiment, the central axis Ax1 of the irradiation range Or1 and the central axis Ax2 of the light-receiving range Ir1 intersect at an angle within the range of 90 to 120 degrees when viewed from the normal direction of the mounting surface 10A of the substrate 10 (see Figure 8). However, this is not limited to this, and the central axes Ax1 and Ax2 may face each other. By providing a barrier such as a light-shielding section 161 or a light-shielding section 161A between the light-emitting section 11 and the light-receiving section 12, it is possible to detect smoke even if the central axes Ax1 and Ax2 face each other.

[0153] (summary) Based on the embodiments described above, the following aspects are disclosed.

[0154] The smoke detection device (1) according to the first embodiment comprises a housing (H1), a light-emitting unit (11), and a light-receiving unit (12). The light-emitting unit (11) irradiates light into a detection space (S1) within the housing (H1). The light-receiving unit (12) receives light within a light-receiving range (Ir1) that includes at least a portion of the irradiation range (Or1) of the light-emitting unit (11) within the detection space (S1). The light-emitting unit (11) has a light-emitting element (1A) and a first mounting substrate (1C) including a first mounting surface (1Ca) on which the light-emitting element (1A) is mounted. The light-receiving unit (12) has a light-receiving element (2A) and a second mounting substrate (2C) including a second mounting surface (2Ca) on which the light-receiving element (2A) is mounted. The second mounting substrate (2C) is either the same substrate as the first mounting substrate (1C), or a different substrate from the first mounting substrate (1C). In the smoke detection device (1), the irradiation range (Or1) is asymmetric with respect to the central axis (D1) of the light-emitting section (11) perpendicular to the first mounting surface (1Ca), and / or the light-receiving range (Ir1) is asymmetric with respect to the central axis (D2) of the light-receiving section (12) perpendicular to the second mounting surface (2Ca).

[0155] According to the above embodiment, it is easy to adjust the ratio of the overlapping area (detection region Da1) between the irradiation area (Or1) and the light-receiving area (Ir1) within the detection space (S1). As a result, there is an advantage in that the smoke detection sensitivity can be easily adjusted.

[0156] With respect to the smoke detection device (1) according to the second embodiment, in the first embodiment, the light-emitting unit (11) further includes a first optical member (1B) that controls the light distribution of the light-emitting element (1A).

[0157] According to the above embodiment, the light-emitting unit (11) having a first optical member (1B) makes it easier to adjust the smoke detection sensitivity.

[0158] With respect to the smoke detection device (1) according to the third embodiment, in the second embodiment, the first optical member (1B) includes a lens (L1).

[0159] According to the above embodiment, the provision of a lens (L1) makes it easier to adjust the smoke detection sensitivity.

[0160] With respect to the smoke detection device (1) according to the fourth embodiment, in the third embodiment, the illumination range (Or1) is asymmetrical with respect to the central axis (D1) of the light-emitting part (11). When viewed along the central axis (D1) of the light-emitting part (11), the center of the lens (L1) and the center of the light-emitting element (1A) are separated from each other.

[0161] According to the above embodiment, it is easier to realize a configuration in which the irradiation range (Or1) is asymmetric with respect to the central axis (D1) of the light-emitting part (11), and the smoke detection sensitivity can be adjusted more easily.

[0162] With respect to the smoke detection device (1) according to the fifth embodiment, in any one of the second to fourth embodiments, the first optical member (1B) includes a light-shielding portion (1Ba).

[0163] According to the above embodiment, the provision of a light-shielding section (1Ba) makes it easier to adjust the smoke detection sensitivity.

[0164] With respect to the smoke detection device (1) according to the sixth embodiment, in any one of the second to fifth embodiments, the first optical member (1B) includes a reflector (1Bb).

[0165] According to the above embodiment, the presence of a reflective section (1Bb) makes it easier to adjust the smoke detection sensitivity.

[0166] With respect to the smoke detection device (1) according to the seventh embodiment, in any one of the first to sixth embodiments, the light receiving unit (12) further includes a second optical member (2B) that controls the light distribution of the light received by the light receiving element (2A).

[0167] According to the above embodiment, the light-receiving unit (12) has a second optical member (2B), which makes it easier to adjust the smoke detection sensitivity.

[0168] The smoke detection device (1) according to the eighth embodiment further comprises one or more third optical members (E1) disposed between the light-emitting unit (11) and the light-receiving unit (12) in any one of the first to seventh embodiments.

[0169] According to the above embodiment, by including the third optical element (E1), the smoke detection sensitivity can be adjusted more easily.

[0170] With respect to the smoke detection device (1) according to the ninth embodiment, in the eighth embodiment, one or more third optical members (E1) include a light-emitting optical member (111) disposed on the light-emitting part (11) side and a light-receiving optical member (121) disposed on the light-receiving part (12) side so as to be spaced apart from the light-emitting optical member (111).

[0171] According to the above embodiment, the provision of an optical member (111) on the light-emitting side and an optical member (121) on the light-receiving side makes it easier to adjust the smoke detection sensitivity.

[0172] The smoke detection device (1) according to the tenth embodiment further comprises, in any one of the first to ninth embodiments, a light-shielding unit (161, 161A) disposed between the light-emitting unit (11) and the light-receiving unit (12) to suppress light emitted from the light-emitting unit (11) from directly entering the light-receiving unit (12).

[0173] According to the above embodiment, by providing light-shielding parts (161, 161A), the smoke detection sensitivity can be adjusted more easily.

[0174] The smoke detection device (1) according to the 11th embodiment further comprises a substrate (10) on which both a light-emitting unit (11) and a light-receiving unit (12) are surface-mounted, in any one of the first to tenth embodiments.

[0175] According to the above embodiment, the number of components can be reduced and the configuration can be simplified compared to the case in which the light-emitting unit (11) and the light-receiving unit (12) are surface-mounted on separate substrates.

[0176] The smoke detection device (1) according to the twelfth embodiment further comprises a substrate (10) on which a light-emitting unit (11) is surface-mounted, in any one of the first to eleventh embodiments. The first mounting surface (1Ca) of the first mounting substrate (1C) is non-parallel to the mounting surface (10A) of the substrate (10) on which the light-emitting unit (11) is surface-mounted.

[0177] According to the above embodiment, even when the first mounting surface (1Ca) is not parallel to the mounting surface (10A), the smoke detection sensitivity can be adjusted more easily.

[0178] The sensor device (detector 30) according to the 13th embodiment comprises a smoke detection device (1) according to any one of the 1st to 12th embodiments, and a housing (2) for housing the smoke detection device (1).

[0179] According to the above embodiment, a sensor device can be provided that facilitates the adjustment of smoke detection sensitivity.

[0180] The sensor device (detector 30) according to the 14th embodiment further comprises a gas detection unit (18) housed in a housing (2) for detecting gas, as in the 13th embodiment.

[0181] According to the above embodiment, in a sensor device equipped with a gas detection unit (18), it is possible to easily adjust the smoke detection sensitivity.

[0182] The sensor system (100) according to the 15th embodiment comprises a sensor device (detector 30) according to the 13th or 14th embodiment, and a receiving device (communication device 20) that communicates with the sensor device (detector 30).

[0183] According to the above embodiment, a sensor system (100) that facilitates adjustment of smoke detection sensitivity can be provided. [Explanation of Symbols]

[0184] 1. Smoke detection device 2 Storage enclosure 10 circuit boards 10A Mounting surface 11 Light-emitting part 1A Light-emitting element 1B First optical component 1Ba Light-shielding part 1Bb Reflector 1C First mounting board 1Ca First Implementation Surface 12 Light receiving part 2A Photodetector 2B Second optical component 2C Second mounting board 2Ca Second implementation surface 18 Gas detection unit 20. Communication equipment (receiving equipment) 30 Detectors (sensor devices) 100 Sensor Systems 111 Light-emitting optical component 121 Optical component on the light-receiving side 161, 161A Light shielding part D1 center axis D2 center axis E1 Third optical component H1 cabinet Ir1 light receiving range L1 Lens Or1 Irradiation range S1 Detection Space

Claims

1. The casing and A light-emitting unit that irradiates light into the detection space within the housing, A light receiving unit that receives light within a light receiving range that includes at least a portion of the irradiation range of the light-emitting unit within the detection space, Equipped with, The light-emitting unit comprises a light-emitting element and a first mounting substrate including a first mounting surface on which the light-emitting element is mounted. The light-receiving unit comprises a light-receiving element and a second mounting substrate including a second mounting surface on which the light-receiving element is mounted. The second mounting board is either the same board as the first mounting board or a different board from the first mounting board. The irradiation range is asymmetrical with respect to the central axis of the light-emitting portion perpendicular to the first mounting surface, and / or the light-receiving range is asymmetrical with respect to the central axis of the light-receiving portion perpendicular to the second mounting surface. Smoke detection device.

2. The light-emitting unit further includes a first optical member that controls the light distribution of the light-emitting element. The smoke detection device according to claim 1.

3. The first optical component includes a lens, The smoke detection device according to claim 2.

4. The irradiation range is asymmetrical with respect to the central axis of the light-emitting part, When viewed along the central axis of the light-emitting part, the center of the lens and the center of the light-emitting element are separated from each other. The smoke detection device according to claim 3.

5. The first optical member includes a light-shielding portion, The smoke detection device according to claim 2.

6. The first optical member includes a reflective portion, The smoke detection device according to claim 2.

7. The light-receiving unit further includes a second optical member that controls the light distribution of the light received by the light-receiving element. The smoke detection device according to claim 1.

8. The system further comprises one or more third optical members disposed between the light-emitting portion and the light-receiving portion. The smoke detection device according to claim 1.

9. The one or more third optical members are, The light-emitting optical member arranged on the light-emitting side, The light-receiving optical member is positioned on the light-receiving side so as to be spaced apart from the light-emitting optical member. The smoke detection device according to claim 8.

10. The system further includes a light-shielding section disposed between the light-emitting section and the light-receiving section to suppress light emitted from the light-emitting section from directly entering the light-receiving section. The smoke detection device according to claim 1.

11. The substrate further comprises a surface-mounted substrate on which both the light-emitting unit and the light-receiving unit are attached. The smoke detection device according to claim 1.

12. The substrate further comprises the aforementioned light-emitting unit on which the substrate is surface-mounted. The first mounting surface of the first mounting substrate is non-parallel to the mounting surface of the substrate on which the light-emitting portion is surface-mounted. The smoke detection device according to claim 1.

13. A smoke detection device according to any one of claims 1 to 12, A housing for the smoke detection device, Equipped with, Sensor device.

14. The aforementioned housing is further equipped with a gas detection unit for detecting gas, The sensor device according to claim 13.

15. The sensor device according to claim 13, A receiving device that communicates with the aforementioned sensor device, Equipped with, Sensor system.

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