Smoke sensor

Abstract

To provide a smoke detector that can be made into a simple explosion-proof structure with a simple configuration and can obtain a simple shielding effect.SOLUTION: A smoke detector 1 includes: a holder 17 in which a recess 25 is formed; a holder substrate 19 on which a light emitting element 27 and a light receiving element 29 are provided and installed in the holder 17 within the recess 25 of the holder 17, such that the light emitting element 27 and the light receiving element 29 are located on the bottom side of the holder 17; a shield material 21 for light-receiving elements installed within the recess 25 of the holder 17 and surrounding the light receiving element 29; and an encapsulating material 23, which is filled between the holder substrate 19 and an opening 31 of the recess 25 in the recess 25 of the holder 17 and seals the opening 31 of the recess 25.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a smoke detector, and particularly to a smoke detector that detects smoke using a light-emitting element and a light-receiving element. [Background Art]

[0002] Conventionally, smoke detectors that detect smoke using a light-emitting element and a light-receiving element are known (see Patent Document 1). In a conventional smoke detector, a light-emitting element and a light-receiving element are provided on a substrate, and the light-receiving element is covered with a shielding material for electromagnetic shielding. In a conventional smoke detector, the shielding material is provided directly on the substrate. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent No. 5726627 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In some cases, a light-receiving element or the like is sealed with resin or the like to provide a simple explosion-proof structure for a smoke detector. However, in a conventional smoke detector, since the light-receiving element and the shielding material are directly provided on the substrate in a dark box, when sealing the light-receiving element and the like, it is necessary to dam the sealing material made of resin or the like, which complicates the structure.

[0005] An object of the present invention is to provide a smoke detector that can have a simple explosion-proof structure with a simple configuration, and can obtain an effective electromagnetic shielding effect while being simple. [Means for Solving the Problem]

[0006] A smoke detector according to an aspect of the present invention comprises a holder having a recess formed therein, a holder substrate provided with a light-emitting element and a light-receiving element, the holder substrate being installed in the holder within the recess of the holder such that the light-emitting element and the light-receiving element are located on the bottom side of the holder, a light-receiving element shielding material installed in the recess of the holder and surrounding the light-receiving element, and a sealing material being filled between the holder substrate and the opening of the recess within the holder and closing the opening of the recess.

[0007] Furthermore, the smoke detector according to an aspect of the present invention has a light-emitting element side light guide material that guides the light emitted from the light-emitting element to the light-receiving element, the holder is configured to have a bottom wall portion and a side wall portion so as to form the recess, the bottom wall portion has a through hole for the light-emitting element and a first through hole for the light-receiving element, the light-receiving element shielding material is formed in a box shape with a bottom plate portion and a side plate portion, and the holder substrate is the box shape of the light-receiving element The smoke detector is configured such that the light-receiving element shielding material engages with the holder substrate in a manner that closes the opening of the child shielding material, a second through-hole for the light-receiving element is formed in the bottom plate portion of the light-receiving element shielding material, the light-emitting element side light guide material extends from inside the recess of the holder to the outside of the holder through the through-hole for the light-emitting element, and the light-receiving element side light guide material extends from inside the recess of the holder to the outside of the holder through the first through-hole for the light-receiving element and the second through-hole for the light-receiving element.

[0008] Furthermore, a smoke detector according to an embodiment of the present invention is a smoke detector having a first main substrate that is separated from the holder and the holder substrate on the opening side of the recess of the holder and engages with the holder substrate, and a first substrate shielding material that is installed from the holder substrate to the first main substrate and surrounds the portion of the holder substrate near the light-receiving element and the portion of the first main substrate near the light-receiving element when viewed in the depth direction of the recess of the holder.

[0009] Furthermore, the smoke detector according to an embodiment of the present invention is a smoke detector having a second substrate shielding material which is formed in a box shape, has an opening that is closed by the first main substrate, engages with the first main substrate on the opposite side from the holder substrate, and surrounds the portion of the first main substrate near the light-receiving element when viewed in the depth direction of the recess of the holder.

[0010] Furthermore, a smoke detector according to an embodiment of the present invention is a smoke detector having a light-receiving element back-side shielding material which surrounds the light-receiving element on one side in the thickness direction of the holder substrate and covers the portion of the holder substrate on the back side of the light-receiving element on the other side in the thickness direction of the holder substrate.

[0011] A smoke detector according to an aspect of the present invention comprises a holder substrate of a holder on which a light-emitting element and a light-receiving element are arranged, a smoke chamber, and a smoke detector body, and detects smoke by detecting the scattering of light in the smoke chamber, wherein the holder substrate and the smoke chamber are separated by a partition wall of the smoke detector body, and a transparent rod-shaped light-emitting element side light guide material that penetrates the partition wall and guides the light of the light-emitting element into the smoke chamber, and a transparent rod-shaped light-receiving element side light guide material that penetrates the partition wall and guides the light from the smoke chamber to the light-receiving element are attached to the holder, and a shielding material for the light-receiving element surrounds the light-receiving element within the holder.

[0012] Furthermore, in the smoke detector according to an embodiment of the present invention, the space between the smoke detector body containing the holder substrate and the holder, separated by the partition wall, is filled with a sealing material having a refractive index lower than that of the transparent rod-shaped body. [Effects of the Invention]

[0013] According to the present invention, a smoke detector can be provided that has a simple structure and can be easily constructed to provide a simple explosion-proof structure, and can achieve an effective electromagnetic shielding effect despite its simplicity. [Brief explanation of the drawing]

[0014] [Figure 1] It is a perspective view of the smoke detector according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of the smoke detector according to an embodiment of the present invention. [Figure 3] It is a perspective view showing a state where an upper cover of the smoke detector is removed from the smoke detector according to an embodiment of the present invention. [Figure 4] It is a perspective view showing a state where a middle cover of the smoke detector is removed from the structure shown in FIG. 3. [Figure 5] It is a perspective view showing a state where a smoke chamber forming member is removed from the structure shown in FIG. 4. [Figure 6] It is a perspective view showing a state where a prism lens is removed from the structure shown in FIG. 5. [Figure 7] It is a perspective view showing a state where a smoke detector main body is removed from the structure shown in FIG. 6. [Figure 8] It is a perspective view showing a state where a first main substrate and a second main substrate are removed from the structure shown in FIG. 7, and is a perspective view of an optical system holder unit. [Figure 9] It is a perspective view showing a state where an optical system holder is removed from the structure shown in FIG. 8. [Figure 10] It is an exploded perspective view of the structure shown in FIG. 7. [Figure 11] It is a cross-sectional view of the structure shown in FIG. 6. [Figure 12] It is an enlarged view of section XII shown in FIG. 11. [Figure 13] It is a perspective view of an optical system holder substrate and a light receiving element shielding material of the smoke detector according to an embodiment of the present invention. [Figure 14] It is a perspective view of an optical system holder unit of the smoke detector according to an embodiment of the present invention. [Figure 15] It is a perspective view showing a state where a sealing material is removed from the structure shown in FIG. 14. [Figure 16] It is a perspective view of an optical system holder of the smoke detector according to an embodiment of the present invention. [Figure 17]It is another perspective view of the optical system holder of the smoke detector according to an embodiment of the present invention. [Figure 18] It is yet another perspective view of the optical system holder of the smoke detector according to an embodiment of the present invention. [Figure 19] It is a perspective view of the shield material for a light receiving element, the first substrate shield material, and the second substrate shield material of the smoke detector according to an embodiment of the present invention. [Figure 20] It is another perspective view of the shield material for a light receiving element, the first substrate shield material, and the second substrate shield material of the smoke detector according to an embodiment of the present invention. [Figure 21] It is yet another perspective view of the shield material for a light receiving element, the first substrate shield material, and the second substrate shield material of the smoke detector according to an embodiment of the present invention. [Figure 22] It is a view taken along arrow XXII in Fig. 20. [Figure 23] It is a diagram showing the operation of the smoke detector according to an embodiment of the present invention. [Figure 24] It is a diagram showing the operation of the smoke detector according to an embodiment of the present invention. MODE FOR CARRYING OUT THE INVENTION

[0015] The smoke detector (explosion-proof smoke detector) 1 according to an embodiment of the present invention is, for example, installed on the ceiling of a room to detect smoke in the room. As shown in Figs. 1 to 8, the smoke detector 1 is configured to include a smoke detector upper cover 3, a smoke detector middle cover 5, a smoke chamber forming member 7, a smoke detector main body 9, an optical system holder unit 11, a first substrate shield member 61, and a second substrate shield member 67.

[0016] For convenience of explanation herein, a predetermined direction in the smoke detector 1 is defined as the X direction, a predetermined direction orthogonal to the X direction is defined as the Y direction, and a direction orthogonal to both the X direction and the Y direction is defined as the Z direction. The Z direction is, for example, the vertical direction.

[0017] The smoke detector upper cover 3, smoke detector inner cover 5, smoke chamber forming material 7, and smoke detector body 9 are each integrally molded from, for example, synthetic resin. The smoke chamber forming material 7, smoke detector inner cover 5, smoke detector upper cover 3, optical system holder unit 11, first main circuit board (first smoke detector circuit board) 13, and second main circuit board (second smoke detector circuit board) 15 are integrally installed on the smoke detector body 9.

[0018] The optical system holder unit 11 comprises a holder (optical system holder) 17, a holder substrate (optical system holder substrate) 19, a light-receiving element shielding material (silicon photodiodes: SPD shield) 21, and a sealing material 23. The holder 17 is integrally molded from synthetic resin. A recess 25 is formed in the holder 17.

[0019] A light-receiving element (e.g., SPD; silicon photodiode) 29 is provided on the holder substrate 19. The holder substrate 19 is integrally installed in the holder 17 within the recess 25 of the holder 17, such that the light-receiving element 29 is located on the bottom side of the recess 25 of the holder 17. A light-emitting element (e.g., IR-LED) 27 is provided on the first main substrate 13. The light-emitting element 27 is inserted into the holder 17, and its positional relationship with the light-receiving element 29 is defined. As shown in Figure 11, the holder substrate 19 is configured to mount the electrodes (legs) of the light-receiving element 29, and the light-emitting element 27 is mounted on the first main substrate 13, with the holder 17 holding both the light-receiving element 29 and the light-emitting element 27.

[0020] The light-receiving element shielding material 21 is made of metal and is installed in the recess 25 of the holder 17, surrounding the light-receiving element 29. The sealing material 23 is filled between the holder substrate 19 and the opening 31 of the recess 25 of the holder 17, sealing the opening 31 of the recess 25. The light-receiving element shielding material 21 is provided for noise protection (electromagnetic shielding) of the light-receiving element 29. The light-receiving element shielding material 21 may also be electrically connected to the ground circuit of the holder substrate 19.

[0021] In the optical system holder unit 11, the holder 17, the light-emitting element 27, the light-receiving element 29, the holder substrate 19, the light-receiving element shielding material 21, and the sealing material 23 are integrated into one unit. The optical system holder unit 11 is assembled by first placing the light-receiving element shielding material 21, the holder substrate 19, etc., in the recess 25 of the holder 17 (see Figure 15), and then installing the sealing material 23 (see Figure 14).

[0022] As shown in Figure 11, the smoke detector 1 receives light emitted by the light-emitting element 27 with the light-receiving element 29. At this time, the light from the light-emitting element is scattered by the smoke, and the smoke is detected by the intensity of the scattered light received by the light-receiving element 29. That is, if there is no smoke between the light-emitting element 27 and the light-receiving element 29, the amount of light received by the light-receiving element 29 is very small. On the other hand, if there is smoke between the light-emitting element 27 and the light-receiving element 29, the amount of light received by the light-receiving element 29 increases. The smoke concentration is detected using this principle.

[0023] To further explain, the smoke detector 1 includes a light-emitting element side light guide material (for example, a transparent rod-shaped glass rod; a glass rod for IR-LEDs) 33 and a light-receiving element side light guide material (for example, a transparent rod-shaped glass rod; a glass rod for photodiodes) 35. The light-emitting element side light guide material 33 guides the light emitted from the light-emitting element side light guide material 33 to the light-receiving element 29. At this time, by making the refractive index of the sealing material 23 smaller than the refractive index of the light guide materials 33 and 35, it is prevented that the light passing through the light guide materials 33 and 35 leaks from the sides of the light guide materials 33 and 35. In this way, the guided light can be confined from the entrance to the exit of the light guide materials 33 and 35.

[0024] As shown in Figures 16 to 18, the holder 17 is constructed with a bottom wall portion 37 and a side wall portion 39. This creates a recess 25 in the holder 17. The bottom wall portion 37 of the holder 17 has a through hole 41 for a light-emitting element (see Figure 11) and a first through hole 43 for a light-receiving element (see Figures 11 and 12).

[0025] As shown in Figures 9, 10, 13, 19 to 22, the light-receiving element shielding material 21 is formed in a box shape with a bottom plate portion 45 and side plate portions 47. As shown in Figure 12, the holder substrate 19 engages with the light-receiving element shielding material 21 in such a manner that the holder substrate 19 closes the opening 49 of the box-shaped light-receiving element shielding material 21. A second through-hole 51 for the light-receiving element is formed in the bottom plate portion 45 of the light-receiving element shielding material 21.

[0026] As shown in Figure 11, the light-emitting element side light guide material 33 extends from inside the recess 25 of the holder 17 to the outside of the holder 17, passing through the through-hole 41 for the light-emitting element. As shown in Figures 11, 12, etc., the light-receiving element side light guide material 35 extends from inside the recess 25 of the holder 17 to the outside of the holder 17, passing through the first through-hole 43 and the second through-hole 51 for the light-receiving element (extending above the upper end of the holder 17).

[0027] As shown in Figures 11 and 12, the bottom wall portion 37 of the holder 17 is formed in a generally flat shape. The holder substrate 19 is also formed in a flat shape. The sealing material 23 is also formed in a generally flat shape. The depth direction (vertical direction; Z direction) of the recess 25 of the holder 17 coincides with the thickness direction of the bottom wall portion 37 of the holder 17, the thickness direction of the holder substrate 19, and the thickness direction of the sealing material 23. Furthermore, if we view the holder 17 (optical system holder unit 11) with the recess 25 of the holder 17 facing forward and the bottom wall portion 37 facing backward, that is, when the optical system holder unit 11 is viewed from above, the entire opening 31 of the recess 25 of the holder 17 is covered with the sealing material 23, and the holder substrate 19 is not visible (see Figure 14, etc.).

[0028] Furthermore, as shown in Figure 12, the light-receiving element 29 is located within a space (almost closed space) 53 enclosed by the holder substrate 19, the light-receiving element shielding material 21, and the light-receiving element side light guide material 35. When viewed in the depth direction of the recess 25 of the holder 17 (the thickness direction of the holder substrate 19; vertical direction), the light-receiving element 29 and the portion of the holder substrate 19 near the light-receiving element 29 are surrounded by the light-receiving element shielding material 21.

[0029] The optical system holder unit 11 is installed inside the smoke detector body 9. The light-emitting element side light guide material 33 and the light-receiving element side light guide material 35 extend above the upper surface of the smoke detector body 9, as shown in Figure 6, etc. A prism lens 54 or prism 54 is provided on the upper surface of the smoke detector body 9, as shown in Figure 5, etc., to guide the light emitted from the light-emitting element side light guide material 33 to the smoke chamber 59.

[0030] Furthermore, as shown in Figure 4, a smoke chamber forming material 7 is provided on the upper surface of the smoke detector body 9, and a smoke detector inner cover 5 is provided on the smoke detector body 9 so as to cover the upper surface of the smoke detector body 9 and the smoke chamber forming material 7 (see Figure 3). A through hole 55 and an insect screen (not shown) are provided in the center of the smoke detector inner cover 5. The smoke detector upper cover 3 is provided on the smoke detector inner cover 5 so as to cover the through hole 55 on the upper side of the smoke detector inner cover 5 (see Figure 1).

[0031] The smoke detector top cover 3 (smoke detector 1) is provided with a ventilation window 57 through which air can pass. The smoke detector body 9, the smoke chamber forming material 7, and the smoke detector inner cover 5 form a smoke chamber 59 (see Figure 3). As shown in Figures 3 to 6, the upper end of the light-emitting element side light guide material 33, the upper end of the light-receiving element side light guide material 35, and the prism lens 54 are arranged inside the smoke chamber 59.

[0032] With the light-emitting element 27 emitting light, smoke generated by a fire or the like passes through the ventilation window 57 and the through-hole 55 of the smoke detector inner cover 5 and enters the smoke chamber 59. As a result, the light emitted from the light-emitting element side light guide material 33 is scattered by the smoke, and the amount of light received by the light-receiving element 29 via the prism lens 54 and the light-receiving element side light guide material 35 increases. This allows smoke to be detected.

[0033] The first main circuit board 13 is installed inside the smoke detector body 9, as shown in Figure 11, etc. The first main circuit board 13 is formed in a flat shape and separates from the holder 17 and holder circuit board 19 on the opening 31 side (upper side) of the recess 25 of the holder 17, and engages with the holder circuit board 19. The thickness direction (Z direction) of the holder circuit board 19 and the thickness direction of the first main circuit board 13 coincide.

[0034] As shown in Figure 12, the smoke detector 1 is provided with a first substrate shielding material (for example, a shielding material for connection parts) 61. The first substrate shielding material 61 is made of metal and is installed from the holder substrate 19 to the first main substrate 13. Viewed in the depth direction of the recess 25 of the holder 17 (the thickness direction of the holder substrate 19; Z direction), the first substrate shielding material 61 surrounds the light-receiving element 29, the portion of the holder substrate 19 near the light-receiving element, and the portion of the first main substrate 13 near the light-receiving element.

[0035] As shown in Figure 12, a generally enclosed space 63 is formed by the holder substrate 19, the first substrate shielding material 61, and the first main substrate 13. Within this generally enclosed space 63, a portion of the circuit of the holder substrate 19 and a portion of the circuit of the first main substrate 13 are connected to each other by leads 65. The first substrate shielding material 61 is provided for noise countermeasures (electromagnetic shielding) at the connection point between the first main substrate 13 and the optical system holder unit 11. The first substrate shielding material 61 may also be electrically connected to the ground circuit of the holder substrate 19 or the first main substrate 13.

[0036] Furthermore, the smoke detector 1 is provided with a second substrate shielding material (for example, a shielding material for an amplifier circuit) 67, as shown in Figure 12, etc. The second substrate shielding material 67 is made of metal and is formed in a box shape, as shown in Figure 19, etc. The second substrate shielding material 67 engages with the first main substrate 13 on the opposite side from the holder substrate 19, such that its opening 69 is covered by the first main substrate 13. When viewed in the depth direction (Z direction) of the recess 25 of the holder 17, the second substrate shielding material 67 surrounds the area of ​​the first main substrate 13 near the light-receiving element 29 and the area of ​​the holder substrate 19 near the light-receiving element 29.

[0037] As shown in Figure 12, a generally enclosed space 71 is formed between the first main board 13 and the second board shielding material 67. The second board shielding material 67 shields the circuit (for example, the amplifier circuit) provided on the first main board 13 for noise reduction (electromagnetic shielding). The second board shielding material 67 may also be electrically connected to the ground circuit of the first main board 13.

[0038] Furthermore, the second main board 15 is positioned above the first main board 13. That is, the second main board 15 separates from the first main board 13 on the opposite side from the holder board 19 and engages with the first main board 13. The second substrate shielding material 67 separates from the second main board 15.

[0039] Looking at the recess 25 of the holder 17 in the depth direction (Z direction), as shown in Figure 22, the outer shape of the second substrate shield material 67 is larger than the outer shape of the first substrate shield material 61. Also, looking at it in the Z direction, the outer shape of the first substrate shield material 61 is larger than the outer shape of the light-receiving element shield material 21. Looking at it in the Z direction, the light-receiving element shield material 21 is located inside the first substrate shield material 61. Also, looking at it in the Z direction, most of the first substrate shield material 61 is located inside the second substrate shield material 67.

[0040] In smoke detector 1, as described above, the light-receiving element shielding material 21 surrounds the light-receiving element 29 on one side (lower side) in the thickness direction of the holder substrate 19. In smoke detector 1, the light-receiving element back-side shielding material (anti-light-receiving element side shielding material) may be configured to cover the portion of the holder substrate 19 on the back side of the light-receiving element 29 on the other side (upper side) in the thickness direction of the holder substrate 19. The light-receiving element back-side shielding material may be provided integrally with the holder 17, for example. The light-receiving element 29 and a predetermined portion of the holder substrate 19 may be arranged within the space surrounded by the light-receiving element shielding material 21 and the light-receiving element back-side shielding material. This shields the light-receiving element 29 and the circuit for this light-receiving element 29 (a circuit that is prone to malfunction due to noise).

[0041] Let's describe the smoke detector 1 in more detail. The smoke detector body 9 is formed in a low, bottomed cylindrical shape. The holder 17 of the optical system holder unit 11 is composed of a main body 73, a first protruding portion 75, and a second protruding portion 77, as shown in Figures 16 to 18. The main body 73 is formed in an elongated rectangular box shape in the X direction. The first protruding portion 75 protrudes from the main body 73 on one side in the X direction to one side in the Y direction. The second protruding portion 77 is formed in a rectangular box shape and protrudes from the main body 73 on the other side in the X direction to one side in the Y direction (the same side as the first protruding portion 75).

[0042] A light-emitting element 27 is installed within the first protruding portion 75, and a light-receiving element 29 and a light-receiving element shielding material 21 are installed within the second protruding portion 77. The holder substrate 19 is configured to include the first portion 79 and the second portion 83, as shown in Figure 9, etc.

[0043] The first portion 79 is formed in an elongated rectangular shape in the X direction. The second portion 83 protrudes from the first portion 79 on one side in the X direction and on one side in the Y direction. When viewed in the Z direction, the holder substrate 19 is formed in a shape that fits just within the recess 25 of the holder 17, except for the first protruding portion 75 of the holder 17.

[0044] The light-receiving element 29, provided on the first main substrate 13, is provided on the second portion 83 of the holder substrate 19. The light-receiving element shielding material 21 is formed in a rectangular box shape with a bottom plate portion 45 and side plate portions 47, as shown in Figure 19, etc. The sealing material 23 is formed in a flat plate shape with a predetermined thickness. The lower surface of the sealing material 23 is in contact with the upper surface of the holder substrate 19. The upper surface of the sealing material 23 faces the opening 31 of the recess 25 of the holder 17.

[0045] The first main substrate 13 is formed in a disc shape. The second main substrate 15 is also formed in a disc shape similar to the first main substrate 13. When viewed in the Z direction, almost the entirety of the first main substrate 13 and almost the entirety of the second main substrate 15 overlap each other. Also, in the Z direction, from top to bottom, the second main substrate 15, the first main substrate 13, and the optical system holder unit 11 are arranged in this order. By dividing the main substrate into the first main substrate 13 and the second main substrate 15, the size of the smoke detector 1 when viewed in the Z direction can be reduced.

[0046] The first main board 13, the second main board 15, and the holder 17 are filled with sealing material 23 inside the smoke detector body 9. This makes it possible to create a safety smoke detector that prevents fires caused by electrical circuits. Furthermore, the sealing material 23 filled in the opening 31 of the recess 25 of the holder 17 and the sealing material 23 filled inside the smoke detector body 9 may be of different types.

[0047] The sealing material 23 fills the inside of the smoke detector body 9 shown in Figure 11. However, the space 53 housing the end faces of the light-receiving element 29 and the light-receiving element-side light guide material 35, and the space housing the end faces of the light-emitting element 27 and the light-emitting element-side light guide material 33, are not filled with the sealing material 23 and are instead filled with a gas such as air or are vacuum spaces. This allows for efficient optical coupling between the end faces of the light-receiving element 29 and the light-receiving element-side light guide material 35, and between the end faces of the light-emitting element 27 and the light-emitting element-side light guide material 33. Examples of sealing material 23 include urethane resin, epoxy resin, and silicone resin.

[0048] The light-emitting element side light guide material 33 and the light-receiving element side light guide material 35 are formed in a cylindrical shape. The central axis of the light-emitting element side light guide material 33 and the central axis of the light-receiving element side light guide material 35 extend in the Z direction. As described above, the upper ends of the light-emitting element side light guide material 33 and the upper ends of the light-receiving element side light guide material 35 protrude above the upper surface of the smoke detector body 9 and are located inside the smoke chamber 59.

[0049] Furthermore, as shown in Figures 7 to 9, the smoke detector 1 is equipped with light-emitting elements (e.g., LEDs) 85 and (e.g., transparent glass rods) 87 for operation indicator lights. The light-emitting elements 85 for operation indicator lights are provided at both ends in the longitudinal direction of the first portion 79 of the holder substrate 19. The light guide material 87 for operation indicator lights is formed in a cylindrical shape, similar to the light-emitting element side light guide material 33 and the light-receiving element side light guide material 35. The central axis of the light guide material 87 for operation indicator lights extends in the Z direction. The light guide materials 87 for operation indicator lights are provided in pairs. The light emitted from each of the pair of light-emitting elements 85 for operation indicator lights is guided by each of the light guide materials 87 for operation indicator lights.

[0050] For the light guide material 87, a material with a higher refractive index than the encapsulating material 23 is advantageous in terms of light confinement effect. In particular, for the light-emitting element side light guide material 33 and the light-receiving element side light guide material 35, efficient light transmission is required, so materials with a greater light confinement effect are advantageous. For example, as a glass material, optical glass, heavy flint glass, sapphire glass, etc., with refractive indices of 1.45 to 1.8 can be appropriately selected. Alternatively, a coating with a refractive index lower than that of the light-emitting element side light guide material 33, the light-receiving element side light guide material 35, and the light guide material 87 may be applied to the light-emitting element side light guide material 33, the light-receiving element side light guide material 35, and the light guide material 87 to achieve a light confinement effect.

[0051] As shown in Figures 4 to 6, the upper end of the light guide material 87 of the light-emitting element 85 for the indicator light protrudes above the upper surface of the smoke detector body 9 and is located outside the smoke chamber 59. The light emitted by the light-emitting element 85 for the indicator light and emitted from the upper end of the light guide material 87 for the indicator light passes through the light guide portion of the smoke detector inner cover 5 and the smoke detector upper cover 3 and comes out into the smoke detector 1. This makes it visible that the smoke detector 1 is operating.

[0052] As described above, the holder board 19 and the first main board 13 are connected by a lead 65, but the smoke detector 1 is also provided with another lead 89, as shown in Figure 11. The holder board 19, the first main board 13, and the second main board 15 are connected as appropriate by the lead 89.

[0053] The first substrate shield material 61 is formed in a rectangular cylindrical shape, as shown in Figures 19 and 20. The second protruding portion 77 of the holder 17 of the optical system holder unit 11 passes through the rectangular cutout 91 formed in the first substrate shield material 61. The second substrate shield material 67 is composed of a low rectangular cylindrical portion 90 and a rectangular flat plate-shaped lid portion 92 that closes one of the openings of the rectangular cylindrical portion 90.

[0054] Furthermore, the smoke detector 1 is equipped with a communication unit 93 for communication operations, as shown in Figures 23 and 24. The smoke detector 1 communicates with the receiver 95 and the adjustment device 97 using the communication unit 93.

[0055] The smoke detector 1 repeats the operation shown in Figure 23 every second. In step S1, a timer interrupt is generated. In step S3, the circuits provided on boards 13, 15, and 19 are activated. In step S5, the light-emitting element 27 emits light. In step S7, if there is smoke in the smoke chamber 59, scattered light is generated. In step S9, the light-receiving element 29 receives the light. In step S11, a fault is detected, and the amount of light received by the light-receiving element 29 is converted from digital to digital. This allows the smoke detector 1 to detect the concentration of smoke. In step S13, the memory is updated. In step S15, the circuit is stopped.

[0056] Furthermore, as shown in Figure 24, the receiver 95 commands the smoke detector 1 to illuminate the operation indicator light. As a result, the light-emitting element 85 for the operation indicator light in the smoke detector 1 illuminates. The smoke detector 1 also sends the detected smoke concentration to the receiver 95. The receiver 95 determines whether the smoke concentration exceeds a predetermined threshold, and if it does, it issues an alarm and commands other devices 99 to trigger an alarm or take fire extinguishing action.

[0057] The smoke detector 1 comprises a holder 17 having a recess 25 formed therein, and a holder substrate 19 installed in the holder 17 within the recess 25 of the holder 17 such that the light-emitting element 27 and the light-receiving element 29 are located on the bottom side of the holder 17.

[0058] Furthermore, the smoke detector 1 is configured to include a light-receiving element shielding material 21 installed in the recess 25 of the holder 17 and surrounding the light-receiving element 29, and a sealing material 23 filled between the holder substrate 19 and the opening 31 of the recess 25 of the holder 17. The sealing material 23 closes the opening 31 of the recess 25. This allows for a simple explosion-proof structure with a simple configuration, and provides an effective electromagnetic shielding effect despite its simplicity.

[0059] Furthermore, in the smoke detector 1, the optical system holder unit 11 is formed by integrating the holder 17, the light-emitting element 27, the light-receiving element 29, the holder substrate 19, the shield for the light-receiving element 21, and the sealing material 23. This simplifies the process of installing the optical system holder unit 11 onto the substrates 13, 15, etc. of the smoke detector 1 when assembling it, making assembly easier. In addition, in the smoke detector 1, the sealing material 23 that seals the opening 31 of the recess 25 of the holder 17 is filled between the holder substrate 19 and the opening 31 of the recess 25 of the recess 25. This makes it easier to seal the light-receiving element 29 and the shield for the light-receiving element 21. Alternatively, the recess 25 may be covered with a lid-like member instead of the sealing material 23.

[0060] Furthermore, the smoke detector 1 is configured to include a light-emitting element-side light guide material 33 to which the light emitted by the light-emitting element 27 is guided, and a light-receiving element-side light guide material 35 to which the light emitted from the light-emitting element-side light guide material 33 and scattered is guided to the light-receiving element 29. In addition, in the smoke detector 1, the holder substrate 19 engages with the light-receiving element shielding material 21 in such a manner that the holder substrate 19 closes the opening 49 of the box-shaped light-receiving element shielding material 21. Moreover, in the smoke detector 1, the light-receiving element-side light guide material 35 extends from inside the recess 25 of the holder 17 to the outside of the holder 17 by passing through the first through hole 43 and the second through hole 51 for the light-receiving element. As a result, even the light-receiving element 29, which is surrounded by the light-receiving element shielding material 21, can reliably detect the light emitted by the light-emitting element 27.

[0061] Furthermore, the smoke detector 1 is configured to include a first substrate shielding material 61 and a first main board 13 that is separated from the holder 17 and holder substrate 19 on the opening 31 side of the recess 25 of the holder 17 and engages with the holder substrate 19. The first substrate shielding material 61 is installed from the holder substrate 19 to the first main board 13 and, when viewed in the depth direction of the recess 25 of the holder 17, surrounds the portion of the holder substrate 19 near the light-receiving element 29 and the portion of the first main board 13 near the light-receiving element 29. In addition, the first substrate shielding material 61 surrounds the leads 65 etc. that connect the holder substrate 19 and the first main board 13. This allows for accurate shielding of the electrical connection between the holder substrate 19 and the first main board 13.

[0062] Furthermore, the smoke detector 1 is provided with a second substrate shielding material 67. The second substrate shielding material 67 is formed in a box shape, and its opening 69 is closed by the first main substrate 13, engaging with the first main substrate 13 on the opposite side from the holder substrate 19. Also, the second substrate shielding material 67 surrounds the area of ​​the first main substrate 13 near the light-receiving element 29 when viewed in the depth direction of the recess 25 of the holder 17. This allows for accurate shielding of the amplifier circuit of the light-receiving element 29 if it is provided on the first main substrate 13.

[0063] The smoke detector 1 described above comprises a holder substrate 19 of a holder 17 on which a light-emitting element 27 and a light-receiving element 29 are arranged, a smoke chamber 59, and a smoke detector body 9. This smoke detector 1 detects smoke by detecting the scattering of light within the smoke chamber 59. The holder substrate 19 and the smoke chamber 59 are separated by a partition wall 8 (see Figures 7, 11, etc.) of the smoke detector body 9. A transparent rod-shaped light-emitting element side light guide material 33, which penetrates the partition wall 8, guides light from the light-emitting element 27 into the smoke chamber 59, and a transparent rod-shaped light-receiving element side light guide material 35, which penetrates the partition wall 8, guides light from the smoke chamber 59 to the light-receiving element 29. These are attached to the holder 17, and a light-receiving element shielding material 21 surrounds the light-receiving element 29 within the holder 17.

[0064] Furthermore, in the smoke detector 1 described above, the space between the smoke detector body 9, which houses the holder substrate 19, and the holder 17, separated by a partition wall 8, is filled with a sealing material 23 having a lower refractive index than the transparent rod-shaped body.

[0065] Although this embodiment has been described above, this embodiment is not limited to these, and various modifications are possible within the scope of the gist of this embodiment. [Explanation of Symbols]

[0066] 1 smoke detector 8 Partition walls 13. First main board 17 Holder 19 Holder board 21 Shielding material for light-receiving elements 23. Sealing material 25 recesses 27 Light-emitting element 29. Photodetector 31. Opening (opening in the recess of the holder) 33. Light guide material on the light-emitting element side 35 Light-receiving element side light guide material 37 Bottom wall 39 Side wall section 41 Through hole for light-emitting element 43 First through-hole for photodetector 45 Bottom plate part 47 Side plate part 49. Aperture (Aperture of the shielding material for the light-receiving element) 51 Second through-hole for photodetector 61. First substrate shielding material 67 Second substrate shielding material 69. Opening (opening of the second substrate shielding material)

Claims

1. A holder having a recess formed therein, A light-emitting element and a light-receiving element are provided, and the light-emitting element and the light-receiving element are located on the bottom side of the holder, and the holder substrate is installed in the holder within the recess of the holder, A light-receiving element shielding material is installed in the recess of the holder and surrounds the light-receiving element, A sealing material is filled between the holder substrate and the opening of the recess in the holder, and closes the opening of the recess. A light guide material on the light-emitting element side, through which the light emitted by the light-emitting element is guided, A light guide material on the light-receiving element side that guides the light emitted and scattered from the light-emitting element side light guide material to the light-receiving element, It has, The holder is configured to include a bottom wall and a side wall, thereby forming the recess. The bottom wall portion has a through hole for the light-emitting element and a first through hole for the light-receiving element. The light-receiving element shielding material is formed in a box shape with a bottom plate portion and a side plate portion, and the light-receiving element shielding material is engaged with the holder substrate in such a manner that the holder substrate closes the opening of the box-shaped light-receiving element shielding material. A second through-hole for the light-receiving element is formed in the bottom plate portion of the shielding material for the light-receiving element. The light guide material on the light-emitting element side extends from within the recess of the holder to the outside of the holder, passing through the through hole for the light-emitting element. A smoke detector in which the light-receiving element side light guide material extends from within the recess of the holder to the outside of the holder, passing through a first through-hole for the light-receiving element and a second through-hole for the light-receiving element.

2. A holder having a recess formed therein, A light-emitting element and a light-receiving element are provided, and the light-emitting element and the light-receiving element are located on the bottom side of the holder, and the holder substrate is installed in the holder within the recess of the holder, A light-receiving element shielding material is installed in the recess of the holder and surrounds the light-receiving element, A sealing material is filled between the holder substrate and the opening of the recess in the holder, and closes the opening of the recess. A first main board that is separated from the holder and the holder substrate at the opening side of the recess of the holder and engages with the holder substrate, A first substrate shield material is installed extending from the holder substrate to the first main substrate, and, when viewed in the depth direction of the recess of the holder, surrounds the portion of the holder substrate near the light-receiving element and the portion of the first main substrate near the light-receiving element, A smoke detector.

3. A holder having a recess formed therein, A light-emitting element and a light-receiving element are provided, and the light-emitting element and the light-receiving element are located on the bottom side of the holder, and the holder substrate is installed in the holder within the recess of the holder, A light-receiving element shielding material is installed in the recess of the holder and surrounds the light-receiving element, A sealing material is filled between the holder substrate and the opening of the recess in the holder, and closes the opening of the recess. A light guide material on the light-emitting element side, through which the light emitted by the light-emitting element is guided, A light guide material on the light-receiving element side that guides the light emitted and scattered from the light-emitting element side light guide material to the light-receiving element, It has, The holder is configured to include a bottom wall and a side wall, thereby forming the recess. The bottom wall portion has a through hole for the light-emitting element and a first through hole for the light-receiving element. The light-receiving element shielding material is formed in a box shape with a bottom plate portion and a side plate portion, and the light-receiving element shielding material is engaged with the holder substrate in such a manner that the holder substrate closes the opening of the box-shaped light-receiving element shielding material. A second through-hole for the light-receiving element is formed in the bottom plate portion of the shielding material for the light-receiving element. The light guide material on the light-emitting element side extends from within the recess of the holder to the outside of the holder, passing through the through hole for the light-emitting element. The light-receiving element side light guide material extends from within the recess of the holder to the outside of the holder, passing through the first through-hole for the light-receiving element and the second through-hole for the light-receiving element. A first main board that is separated from the holder and the holder substrate at the opening side of the recess of the holder and engages with the holder substrate, A first substrate shield material is installed extending from the holder substrate to the first main substrate, and, when viewed in the depth direction of the recess of the holder, surrounds the portion of the holder substrate near the light-receiving element and the portion of the first main substrate near the light-receiving element, A smoke detector.

4. The smoke detector according to claim 2, further comprising a second substrate shielding material which is formed in a box shape, has an opening which is closed by the first main substrate, engages with the first main substrate on the opposite side from the holder substrate, and surrounds the portion of the first main substrate near the light-receiving element when viewed in the depth direction of the recess of the holder.

5. A holder having a recess formed therein, A light-emitting element and a light-receiving element are provided, and the light-emitting element and the light-receiving element are located on the bottom side of the holder, and the holder substrate is installed in the holder within the recess of the holder, A light-receiving element shielding material is installed in the recess of the holder and surrounds the light-receiving element, A sealing material is filled between the holder substrate and the opening of the recess in the holder, and closes the opening of the recess. It has, The light-receiving element shielding material surrounds the light-receiving element on one side in the thickness direction of the holder substrate. A smoke detector having a light-receiving element back-side shielding material that covers the portion of the holder substrate on the other side in the thickness direction of the holder substrate that is on the back side of the light-receiving element.

6. A holder having a recess formed therein, A light-emitting element and a light-receiving element are provided, and the light-emitting element and the light-receiving element are located on the bottom side of the holder, and the holder substrate is installed in the holder within the recess of the holder, A light-receiving element shielding material is installed in the recess of the holder and surrounds the light-receiving element, A sealing material is filled between the holder substrate and the opening of the recess in the holder, and closes the opening of the recess. A light guide material on the light-emitting element side, through which the light emitted by the light-emitting element is guided, A light guide material on the light-receiving element side that guides the light emitted and scattered from the light-emitting element side light guide material to the light-receiving element, It has, The holder is configured to include a bottom wall and a side wall, thereby forming the recess. The bottom wall portion has a through hole for the light-emitting element and a first through hole for the light-receiving element. The light-receiving element shielding material is formed in a box shape with a bottom plate portion and a side plate portion, and the light-receiving element shielding material is engaged with the holder substrate in such a manner that the holder substrate closes the opening of the box-shaped light-receiving element shielding material. A second through-hole for the light-receiving element is formed in the bottom plate portion of the shielding material for the light-receiving element. The light guide material on the light-emitting element side extends from within the recess of the holder to the outside of the holder, passing through the through hole for the light-emitting element. The light-receiving element side light guide material extends from within the recess of the holder to the outside of the holder, passing through the first through-hole for the light-receiving element and the second through-hole for the light-receiving element. The light-receiving element shielding material surrounds the light-receiving element on one side in the thickness direction of the holder substrate. A smoke detector having a light-receiving element back-side shielding material that covers the portion of the holder substrate on the other side in the thickness direction of the holder substrate that is on the back side of the light-receiving element.

Images