Smoke sensor

Abstract

To provide a smoke sensor capable of miniaturizing a whole housing.SOLUTION: A smoke sensor (100) includes a first cover (11), a second cover (12), a sensing part (20), a speaker (40), and a control board (30). The control board (30) is stored in an internal space of a housing (10) so as to allow a first surface (31) to face the first cover (11) and to allow a second surface (32) to face the second cover (12). The internal space includes: a first space (101) formed between the first surface (31) and the first cover (11); and a second space (102) formed between the second surface (32) and the second cover (12). The speaker (40) is stored on a side of the first space (101) so as to be at least partially embedded in a recessed part provided in the first cover (11). The sensing part (20) is provided on a side of the second space (102).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to miniaturizing smoke detectors. [Background technology]

[0002] The smoke detector will trigger an alarm when the smoke concentration in the monitored room reaches a threshold value, indicating a fire has occurred.

[0003] The following smoke detector is known as a prior art (see, for example, Patent Document 1). The smoke detector disclosed in Patent Document 1 is arranged in a housing and includes a control board on which electronic components are mounted, a speaker that generates sound based on a signal input from the control board, and a spring terminal that connects the control board and the speaker. This configuration makes it possible to provide a detector that is highly resistant to vibrations and easy to use. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-46125 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, a conventional smoke detector will be specifically exemplified.

[0006] FIG. 6 is a perspective view illustrating a conventional smoke detector, and FIG. 7 is a perspective view illustrating a conventional smoke detector of a different type from the smoke detector shown in FIG.

[0007] A first conventional smoke detector 100A shown in FIG. 6 has a first cover 11A and a second cover 12A that form a housing 10A.

[0008] The first cover 11A has a contact surface 13A that contacts the installation surface of the wall or ceiling in the room to be monitored. The first conventional smoke detector 100A is installed in the room to be monitored via this contact surface 13A. Hereinafter, the room to be monitored will be referred to as the "monitoring area."

[0009] The second cover 12A has a vent 14 that connects the inside of the housing with the outside. When smoke occurs in the monitored area, the smoke flows into the inside of the housing 10A through the vent 14A.

[0010] 7 also has a first cover 11B and a second cover 12B that are engaged to form a housing 10B. Like the first conventional smoke detector 100A, the first cover 11B has an abutment surface 13B, and the second cover 12B has an air vent 14B.

[0011] FIG. 8 is a schematic diagram illustrating cross sections of the two types of smoke detectors shown in FIGS. 6 and 7, respectively.

[0012] In FIG. 8(A), a first conventional smoke detector 100A has a detector 20A, a control board 30A, a speaker 40A, and a battery 50A.

[0013] The sensing section 20A is a section that senses smoke flowing in through the ventilation opening 14A. The sensing section 20A is composed of an optical sensing unit (not shown) and a sensing area into which smoke flows in from the outside. The shaded area shown in Fig. 8(A) illustrates the sensing section 20A and the sensing area.

[0014] The control board 30A is a board on which a controller is mounted that controls the speaker 40A to output an alarm sound when smoke is detected by the detection unit 20A. The control board 30A operates using power supplied from the battery 50A, and causes the detection unit 20A to perform a detection operation and the speaker 40A to output an alarm sound.

[0015] 8(B) also includes a sensing unit 20B, a control board 30B, a speaker 40B, and a battery 50B. The functions and uses of these components are similar to those of the first conventional smoke detector 100A.

[0016] The sensing section 20B of the second conventional smoke sensor 100B includes a sensing area shown by the shaded area in FIG. 8(B) and an optical sensing unit 21B shown in FIG. 9, which will be described later.

[0017] The first conventional smoke sensor 100A shown in FIG. 8(A) and the second conventional smoke sensor 100B shown in FIG. 8(B) have different housing shapes.

[0018] That is, the housing 10A of the first conventional smoke sensor 100A has a protruding shape at the portion of the sensing unit 20A. Also, in the first conventional smoke sensor 100A, a speaker 40A is provided above the control board 30A.

[0019] For these reasons, the housing 10A of the first conventional smoke sensor 100A has a shape that extends in the height direction.

[0020] On the other hand, the second conventional smoke detector 100B is configured to eliminate the protruding portions of the first conventional smoke detector 100A. Also, the second conventional smoke detector 100B is configured such that the control board 30B and the speaker 40B are arranged side by side.

[0021] For this reason, the housing 10B of the second conventional smoke detector 100B has a flatter shape than the housing 10A of the first conventional smoke detector 100A. Therefore, even when the second conventional smoke detector 100B is installed indoors, it can be made less noticeable than the first conventional smoke detector 100A.

[0022] However, in the second conventional smoke detector 100B, the area of ​​the contact surface 13B is increased due to the reduced height. Therefore, although the height of the second conventional smoke detector 100B can be reduced, the housing of the entire detector has not yet been made smaller.

[0023] It is also possible to miniaturize the entire detector by miniaturizing each component, such as the speaker 40B or the battery 50B. However, reducing the size of the speaker 40B limits the output volume, making it difficult to output a loud alarm. Also, reducing the size of the battery 50B shortens the power supply life, making it difficult to use continuously for a long period of time. Therefore, there is a limit to how much these components can be miniaturized.

[0024] The smoke detector according to Patent Document 1 also has the control board and speaker arranged side by side, similar to the second conventional smoke detector 100B. Therefore, the area of ​​the contact surface is large in the smoke detector according to Patent Document 1, similar to the second conventional smoke detector 100B.

[0025] Furthermore, when the control board 30B and the speaker 40B are arranged side by side, other problems may arise in addition to the wide contact surface.

[0026] FIG. 9 is a perspective view of the second conventional smoke detector 100B shown in FIG. 7 when viewed through the second cover 12B.

[0027] In the second conventional smoke detector 100B, the control board 30B and the speaker 40B are arranged side by side, which tends to create a space that is difficult to use, i.e., a dead space. In the example of Fig. 9, the dashed area S surrounded by the speaker 40B and the battery 50B is a dead space, so the area that should be used as the control board 30B cannot be used.

[0028] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a smoke detector that can reduce the size of the entire housing. [Means for solving the problem]

[0029] The smoke detector of the present disclosure comprises a first cover having a contact surface that contacts the installation surface, a second cover arranged to face the opposite surface of the contact surface, a detection unit that detects smoke, a speaker that emits an alarm sound, and a control board equipped with a controller that controls the speaker to output an alarm sound when smoke is detected by the detection unit, wherein the detection unit, the speaker, and the control board are arranged in an internal space of a housing formed by the first cover and the second cover, and the control board is housed in the internal space so that its first surface faces the first cover and its second surface faces the second cover, and the internal space has a first space formed between the first surface and the first cover and a second space formed between the second surface and the second cover, and the speaker is housed on the first space side so that at least a portion of it is embedded in a recess provided in the first cover, and the detection unit is arranged on the second space side. [Effects of the Invention]

[0030] According to the present disclosure, a smoke detector can be obtained that can reduce the size of the entire housing. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a perspective view showing a smoke detector according to a first embodiment of the present disclosure. [Figure 2] 2 is a perspective view of the smoke detector shown in FIG. 1 with a second cover and a second inner cover removed. FIG. [Figure 3] 2 is a perspective view of the smoke detector shown in FIG. 1 as seen from below, with a first cover removed. FIG. [Figure 4] 2 is a perspective view showing only a first cover and a speaker in the smoke detector shown in FIG. 1. FIG. [Figure 5] 2A and 2B are schematic diagrams illustrating cross sections of a conventional smoke detector and the smoke detector shown in FIG. 1 . [Figure 6] FIG. 1 is a perspective view illustrating a conventional smoke detector. [Figure 7] FIG. 7 is a perspective view illustrating a conventional smoke detector of a different type from the smoke detector shown in FIG. 6. [Figure 8] 8A and 8B are schematic diagrams illustrating cross sections of the two types of smoke detectors shown in FIGS. 6 and 7, respectively. [Figure 9] FIG. 8 is a perspective view of the second conventional smoke detector shown in FIG. 7 when viewed through a second cover. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, preferred embodiments of the smoke detector of the present disclosure will be described with reference to the drawings. The smoke detector according to the present disclosure has a first cover with a contact surface that contacts the installation surface of the wall or ceiling of the monitoring area, and a second cover that is provided facing the opposite surface of the contact surface. The smoke detector according to the present disclosure also has a configuration in which a control board, a speaker, and a sensing unit are provided in the internal space of the housing formed by the first and second covers.

[0033] The control board of the present disclosure is housed in the internal space of the housing so that the first surface faces the first cover and the second surface faces the second cover, and the speaker is technically housed in the space formed between the first surface of the control board and the first cover so that at least a portion of the speaker is embedded in a recess provided in the first cover.

[0034] By having such technical features, the smoke detector of the present disclosure can achieve a reduction in the size of the entire housing.

[0035] Embodiment 1 Fig. 1 is a perspective view showing a smoke detector according to a first embodiment of the present disclosure, in which Fig. 1(A) is a perspective view showing the appearance of smoke detector 100, and Fig. 1(B) is a perspective view showing the smoke detector with second cover 12 removed.

[0036] As shown in FIG. 1(A), the smoke detector 100 has a first cover 11 and a second cover 12, which are engaged with each other to form a housing 10.

[0037] The first cover 11 has an abutment surface 13. The smoke detector 100 is attached to an installation surface such as a wall or ceiling within a monitoring area by fixing the abutment surface 13 in contact with the installation surface.

[0038] The second cover 12 is provided so as to face an opposite surface 15, which is the surface opposite to the contact surface 13, as shown in FIG. 4 described later.

[0039] The second cover 12 has a vent 14 that connects the internal space of the housing 10 with the outside, and if smoke occurs within the monitored area, the smoke will flow into the interior of the housing 10 through this vent 14.

[0040] 1(B), removing the second cover 12 exposes the second inner cover 18 and the optical sensing unit 21. The second inner cover 18 is provided to protect the control board 30, which will be described later.

[0041] The second inner cover 18 is provided with a through hole 18A, the purpose of which will be described later, and the optical sensing unit 21 will also be described later.

[0042] Fig. 2 is a perspective view of the smoke detector 100 shown in Fig. 1 with the second cover 12 and the second middle cover 18 removed. Fig. 3 is a perspective view of the smoke detector 100 shown in Fig. 1 viewed from below, showing the state with the first cover 11 removed.

[0043] In FIG. 2, part of the outline of the second cover 12 is shown by a broken line, and in FIG. 3, FIGS. 3(A) and 3(B) are shown.

[0044] 3(A) is a diagram showing a state in which the first cover 11 has been removed to expose the first inner cover 17, and FIG. 3(B) is a diagram showing a state in which the first inner cover 17 has been removed to expose the control board 30. The first inner cover 17, together with the second inner cover 18, is provided to protect the control board 30.

[0045] 2, smoke detector 100 includes a sensing unit 20, a control board 30, a speaker 40, and a battery 50. The sensing unit 20, control board 30, speaker 40, and battery 50 are provided in the internal space of housing 10 formed by first cover 11 and second cover 12.

[0046] The sensing section 20 is a part that senses smoke and includes a sensing area and an optical sensing unit 21. Here, the sensing area refers to the area surrounded by the second cover 12 and the control board 30 in Fig. 2, but more specifically, the internal area surrounded by the second cover 12 and the second middle cover 18 is the sensing area.

[0047] The optical sensing unit 21 includes a light-emitting element and a light-receiving element. When smoke is generated in the monitoring area where the unit is installed and flows into the optical sensing unit 21 through the ventilation opening 14, the light from the light-emitting element hits the smoke particles and is diffusely reflected. The optical sensing unit 21 uses this characteristic to detect smoke.

[0048] The speaker 40 is a device that converts an electrical signal from the control board 30 into sound and emits a warning sound.

[0049] The control board 30 is a board on which a controller is mounted, which controls the speaker 40 to output an alarm sound when smoke is detected by the detector 20. The control board 30 is housed and protected by the first inner cover 17 and the second inner cover 18.

[0050] The battery 50 is a storage battery that supplies power to the control board 30. With power supplied from the battery 50, the control board 30 causes the sensing unit 20 to perform sensing operation and causes the speaker 40 to output a warning sound.

[0051] Here, the sensing unit 20 is provided on one surface of the control board 30, that is, on the side of the second surface 32 facing the second cover 12.

[0052] In contrast, the speaker 40 is provided on the other surface of the control board 30, that is, on the first surface 31 side facing the first cover 11, as shown in FIG. 3(B).

[0053] 2, the control board 30 is provided with a through hole 33. The through hole 33 is provided so as to penetrate from the first surface 31 to the second surface 32. Note that the dimensions, shape, etc. of the through hole 33 are not limited to those shown in FIG.

[0054] FIG. 4 is a perspective view showing only the first cover 11 and the speaker 40 in the smoke detector 100 shown in FIG.

[0055] As described above, the speaker 40 is provided on the first surface 31 side of the control board 30, but in addition, as shown in Figure 2, it is provided at a position where a warning sound is output through the through hole 33.

[0056] That is, the through-hole 33 is provided so as not to block the warning sound output from the speaker 40. Also, in order to not block the warning sound from the speaker 40, a through-hole 18A is provided in the second inner cover 18 shown in FIG. 1(B) at the same position.

[0057] 4, speaker 40 is housed so that at least a portion of it is embedded in a recess provided in first cover 11. Here, the depth of the recess in first cover 11 may be deep enough to embed the entire speaker 40, or deep enough to embed only a portion of speaker 40.

[0058] FIG. 5 is a schematic diagram illustrating a cross section of a conventional smoke detector and the smoke detector 100 shown in FIG.

[0059] Here, Fig. 5(A) is the same as Fig. 8(A) above and is a schematic diagram showing a cross section of a first conventional smoke sensor 100A. Fig. 5(B) is the same as Fig. 8(B) above and is a schematic diagram showing a cross section of a second conventional smoke sensor 100B. Fig. 5(C) is a schematic diagram showing a cross section of a smoke sensor 100 in embodiment 1. Note that Fig. 5(C) omits the first inner cover 17 and the second inner cover 18.

[0060] As shown in Figure 5(C), the control board 30 is housed in the internal space of the housing 10 so that the first surface 31 faces the first cover 11 and the second surface 32 faces the second cover 12.

[0061] In addition, the internal space of the housing 10 has a first space 101 formed between the first surface 31 and the first cover 11, and a second space 102 formed between the second surface 32 and the second cover 12.

[0062] The speaker 40 is housed on the first space 101 side so that at least a portion of the speaker 40 is embedded in a recess provided in the first cover 11. On the other hand, the sensing unit 20 is provided on the second space 102 side.

[0063] The battery 50 is disposed so as to penetrate the control board 30 and straddle the first space 101 and the second space 102, and is disposed at a position spaced apart from the speaker 40 by a predetermined distance or more.

[0064] As in embodiment 1, by providing the speaker 40 in the first space 101, the area of ​​the contact surface 13 can be reduced compared to the second conventional smoke detector 100B in which the control board 30B and the speaker 40B are arranged side by side.

[0065] Furthermore, by storing speaker 40 so that at least a portion of it is embedded in the recess of first cover 11, the height can be reduced compared to first conventional smoke detector 100A shown in FIG. 5(A).

[0066] That is, the height direction of the smoke detector 100 shown in Fig. 5(C) can be made approximately the same as that of the second conventional smoke detector 100B shown in Fig. 5(B).The area of ​​the smoke detector 100 shown in Fig. 5(C) that abuts on the installation surface such as a wall or ceiling can be made approximately the same as that of the first conventional smoke detector 100A shown in Fig. 5(A).

[0067] In the smoke detector 100 of the first embodiment, it is also possible to provide the speaker 40 in the second space 102 instead of the first space 101. However, providing the speaker 40 in the second space 102 would compress the sensing area of ​​the sensing unit 20, thereby affecting the detection of smoke by the sensing unit 20. For this reason, in the first embodiment, the speaker 40 is provided in the first space 101.

[0068] Furthermore, in the smoke detector 100, the speaker 40 is provided in the first space 101, and therefore does not appear on the second surface 32 of the control board 30, as shown in FIG.

[0069] On the other hand, in the second conventional smoke detector 100B, the speaker 40B appears on a horizontal plane including the surface of the control board 30B, as shown in Fig. 9. Because the speaker 40B appears on the surface of the control board 30B in this way, a dead space is formed between the speaker 40B and the battery 50B.

[0070] In contrast to this, in the first embodiment, as described above, the speaker 40 does not appear on the second surface 32 of the control board 30. Therefore, no dead space is created between the speaker 40 and the battery 50.

[0071] On the other hand, in FIG. 5(C), if the speaker 40 and the battery 50 are close to each other in the horizontal direction, a dead space may be formed between the through-hole 33 corresponding to the position of the speaker 40 and the battery 50.

[0072] For this reason, in the first embodiment, the speaker 40 and the battery 50 are spaced apart in the horizontal direction by a predetermined distance or more, thereby reducing the dead space created by the through-hole 33 and the battery 50.

[0073] Here, the predetermined distance is a distance that does not create a dead space between the through-hole 33 and the battery 50, and further, a distance that maintains the strength and durability of the control board 30 at the narrowest part.

[0074] As described above, by adopting the configuration of the first embodiment, it is possible to reduce the occurrence of dead space and ensure the board area of ​​the control board 30.

[0075] The smoke detector 100 has the following features and can achieve the following effects.

[0076] Smoke detector 100 comprises a first cover 11 having a contact surface 13 that contacts the installation surface, and a second cover 12 that is provided so as to face the opposite surface 15 of contact surface 13. Smoke detector 100 also comprises a sensing unit 20 that detects smoke, a speaker 40 that emits an alarm sound, and a control board 30 that controls speaker 40 to output the alarm sound when smoke is detected by sensing unit 20.

[0077] The sensing unit 20, speaker 40, and control board 30 are provided in the internal space of the housing 10 formed by the first cover 11 and the second cover 12. The control board 30 is housed in the internal space so that its first surface 31 faces the first cover 11 and its second surface 32 faces the second cover 12. The internal space has a first space 101 formed between the first surface 31 and the first cover 11, and a second space 102 formed between the second surface 32 and the second cover 12.

[0078] Furthermore, the speaker 40 is housed on the first space 101 side so that at least a portion of it is embedded in a recess provided in the first cover 11, and the sensing unit 20 is provided on the second space 102 side.

[0079] This makes it possible to obtain a smoke detector 100 in which the overall housing can be made smaller. That is, as shown in Figures 5(A) and 5(B) above, the first cover 11 originally had a certain thickness so that the batteries 50A, 50B could be embedded therein. By utilizing this thickness to embed the speaker 40 in the first cover 11, it is possible to achieve a reduction in size in the height direction. Furthermore, by arranging the speaker 40 below the control board 30 rather than next to it, it is possible to achieve a reduction in size in the width direction.

[0080] The control board 30 is provided with a through-hole 33 that penetrates from the first surface 31 to the second surface 32. The speaker 40 is disposed on the first space 101 side so that a warning sound is output from the first space 101 to the second space 102 side via the through-hole 33.

[0081] Therefore, the warning sound can be prevented from being blocked by the control board 30.

[0082] In addition, the control board 30 is further equipped with a battery 50 for power supply, which is arranged to penetrate the control board 30 and straddle the first space 101 and the second space 102, and is arranged at a position at least a predetermined distance away from the speaker 40.

[0083] This reduces the occurrence of dead space. [Explanation of symbols]

[0084] 10 housing, 11 first cover, 12 second cover, 13 abutment surface, 14 ventilation hole, 15 opposite surface, 17 first middle cover, 18 second middle cover, 18A through hole, 20 sensing part, 21 optical sensing unit, 30 control board, 31 first surface, 32 second surface, 33 through hole, 40 speaker, 50 battery, 100 smoke detector, 101 first space, 102 second space.

Claims

1. a first cover having a contact surface that contacts the installation surface; a second cover provided to face the opposite surface of the abutting surface; A sensor that detects smoke; a speaker that emits a warning sound; a control board on which a controller is mounted that controls the speaker to output an alarm sound when smoke is detected by the detector; Equipped with the sensing unit, the speaker, and the control board are provided in an internal space of a housing formed by the first cover and the second cover, the control board is housed in the internal space such that a first surface faces the first cover and a second surface faces the second cover; the internal space includes a first space formed between the first surface and the first cover, and a second space formed between the second surface and the second cover, The speaker is housed on the first space side so that at least a portion of the speaker is embedded in a recess provided in the first cover, The sensing unit is provided on the second space side. Smoke detector.

2. the control board is provided with a through-hole that penetrates from the first surface to the second surface, The speaker is disposed on the first space side so that a warning sound is output from the first space to the second space side through the through hole.

10. The smoke detector of claim 1.

3. The control board is further equipped with a battery for power supply, The battery is disposed so as to penetrate the control board and straddle the first space and the second space, and is disposed at a position spaced apart from the speaker by a predetermined distance or more.

3. The smoke detector of claim 2.

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