JP6899016B2 - Fire alarm - Google Patents

Description

The present invention relates to an equipment mounting structure mounted on a wall surface or a ceiling surface of a building, a mounting plate thereof, an alarm device that detects an abnormality such as a fire and issues an alarm, a fire alarm device, and a manufacturing method thereof.

This application is a Japanese patent application filed on October 28, 2015, Japanese Patent Application No. 2015-21508, a Japanese patent application filed on November 17, 2015, Japanese Patent Application No. 2015-224319, November 2015. Japanese Patent Application No. 2015-215527, which is an application dated 2nd, Japanese Patent Application 2015-234562, which is an application dated December 1, 2015, and Japanese Patent Application, which is an application dated April 22, 2016. It alleges the interests of Japanese Patent Application No. 2016-086052, which is incorporated herein by reference in its entirety.

For equipment that is mounted on an installation surface such as a wall surface or ceiling surface of a building, the equipment body may be fixed by a mounting plate. Such devices include, for example, fire alarms and gas alarms. The fire alarm detects smoke, heat, or flame generated by a fire with a sensor, and when a fire is detected, issues an alarm by voice or light.

One surface of the mounting plate is in contact with the installation surface of the building and is fixed, and the other surface is a surface on which the device body can be fixed. When mounting the device body on the installation surface, first, the mounting plate is screwed and fixed to the installation surface, and the device body is mounted and fixed to the fixed mounting plate. As a device mounting structure including a mounting plate and a device body, for example, there is one as listed in Patent Document 1.

A speaker for emitting sound is provided in the housing of the fire alarm. The speaker issues an alarm when a fire is detected. The speaker is fixed in the housing, and an acoustic hole is formed in the front portion of the housing at a position facing the speaker. The sound from the speaker is propagated to the front side of the housing through the acoustic holes. Examples of such a fire alarm include those listed in Patent Document 2.

For fire alarms that are mainly installed in houses, in order to easily perform operations such as the first power-on, periodic operation test, or alarm stop when an alarm is issued, it is mainly on the front of the housing. An operation button is provided. By pressing the operation button, the push button switch inside the fire alarm can be pressed, and various operations can be performed. In addition, the operation button may be provided with a drawstring attachment portion. When the fire alarm is installed in a high place, the operation button can be operated by pulling the drawstring by attaching the drawstring to the operation button. Examples of fire alarms provided with such operation buttons are those listed in Patent Document 3.

The fire alarm is attached to an installation surface such as a wall surface or ceiling surface of a building, detects smoke generated by a fire by a sensor unit, and when a fire is detected, issues an alarm by voice or light. Smoke detection in a fire alarm is performed by a smoke detector having a light emitting unit and a light receiving unit. The light receiving unit is arranged so that the light from the light emitting unit is not directly incident in the smoke detection unit. When smoke enters the smoke detection unit, a part of the light from the light emitting unit is scattered by the smoke, and the presence of the smoke can be detected by receiving the scattered light at the light receiving unit. Since the smoke detector detects smoke based on the above-mentioned principle, it is necessary to prevent light from the outside from entering the smoke detector. Therefore, the smoke detection unit cover is provided so as to cover the area of the smoke detection unit. The smoke detection part cover is provided with a plurality of wall parts rising from the base along the circumferential direction. This wall portion blocks light from the outside and prevents it from entering the light receiving portion. Examples of fire alarms having such a smoke detector cover are those listed in Patent Document 4.

Further, conventionally, a photoelectric smoke detector which is installed on the installation surface of a monitoring area and detects smoke in the monitoring area to give an alarm has been proposed (for example, Patent Document 5). Such a conventional photoelectric smoke detector is generally provided with a light emitting element, a light receiving element, a light receiving lens, a detection unit main body, and a smoke detection unit, and is divided from the light emitting element by a detection unit main body and a smoke detection unit. The light receiving lens collects the scattered light in the smoke detector based on the light emitted in the detection space, the light receiving element receives the collected light, and the detection space is based on the amount of light received by the light receiving element. It detected the smoke that had flowed into the light and issued an alarm. Here, when assembling such a photoelectric smoke detector, first, the light emitting element and the light receiving element are attached to a mounting mechanism (a hole having a shape corresponding to the light emitting element and the light receiving element, etc.) provided in the detection unit main body. ), The optical axes of the light emitting element and the light receiving element are determined, and in this state, the connecting wire (foot) of the light emitting element and the light receiving element is inserted into the through hole of the substrate, and then the connecting wire is soldered to the substrate. Was implemented.

JP-A-2007-47896 Japanese Unexamined Patent Publication No. 2012-14742 JP-A-2007-122414 Japanese Unexamined Patent Publication No. 2011-248545 JP-A-2010-39935

When the mounting plate is screwed to the installation surface, the head of the screw is exposed on the front side of the mounting plate, that is, on the mounting side of the main body of the device. If the head of the screw hits the device body when mounting the device body to the mounting plate, the device body may be damaged. For example, in the main body of a device in which a battery is mounted, the head of a screw may collide with the battery, which may damage the battery. In addition to that, the head of the screw may damage the wiring or the like of the main body of the device. In particular, when the device body is made thinner, the space margin in the device body becomes smaller, so that the head of the screw exposed from the mounting plate is more likely to affect the device body.

In a fire alarm, the sound level from the speaker is required to be equal to or higher than a predetermined level. That is, the sound pressure of the speaker must be equal to or higher than a predetermined value, but the diameter of the speaker that can be mounted is limited as the housing becomes smaller. Therefore, it is desired to increase the sound pressure while keeping the diameter of the speaker as it is.

In order to make the operation buttons easier to operate, it is desirable to increase the size of the operation buttons. However, when the size of the operation button is increased, the structure for the pressing operation and the returning operation to the original position becomes complicated, the number of parts of the operation button increases, or the shape of the operation button itself becomes complicated. It was. Due to the complicated structure of the operation buttons, the pressing operation may vary due to the component tolerance.

Fire alarms are required to be miniaturized. Since the wall of the smoke detector cover is formed in a substantially V-shaped cross section in order to improve the light blocking effect, the size in the radial direction is relatively large, which is a factor that hinders the miniaturization of the fire alarm. It was.
In addition, the fire alarm is provided with a speaker for issuing a sound, and if the speaker partially overlaps the smoke detector cover in the thickness direction of the housing, sufficient sound pressure can be obtained from the speaker. Since there is a possibility that they will disappear, it is necessary to arrange them so that they do not overlap. As fire alarms have become smaller and smaller in size, it has become difficult to arrange them so that they do not overlap.

However, in the mounting method as described above, since it is necessary to insert the connecting wire of the light emitting element and the light receiving element into the through hole of the substrate at the same time, the insertion work is difficult and it is troublesome to mount the light emitting element and the light receiving element. Was required. Further, since a mounting mechanism for mounting a light emitting element or a light receiving element is required on the detection unit main body, the mechanism of the detection unit main body becomes complicated, which is not preferable.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a device mounting structure and a mounting plate capable of preventing the screws for fixing the mounting plate from affecting the device body.
Further, the present invention has been made in view of the above problems, and provides an alarm device capable of increasing the sound pressure of a speaker mounted in a housing, saving space for speaker installation, and securely fixing the speaker. The purpose is to do.
Further, the present invention has been made in view of the above problems, and an object of the present invention is to provide an alarm device capable of performing a pressing operation and a returning operation to the original position without variation with a simple structure.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a fire alarm device in which the smoke detection unit can be miniaturized and the smoke detection unit cover can be arranged so as not to overlap with a speaker or the like in the housing. And.
Further, the present invention has been made in view of the above problems, and can simplify the mounting work of the detection means (corresponding to the light emitting element and the light receiving element) and the mechanism of the covering means (corresponding to the detection unit main body). It is an object of the present invention to provide an alarm device and a method for manufacturing the same, which can simplify the above.

In order to solve the above problem, the fire alarm device according to claim 1 is an alarm device attached to an installation surface of an object to be installed, and has an attachment surface facing the installation surface, and is contained in a housing. A fire alarm, which is an alarm device having a smoke detection unit , including a detection means for detecting smoke contained in a gas and a storage means for accommodating the detection means, and the smoke detection unit. Is provided with a smoke detection unit cover so as to surround the smoke detection area in which the sensor unit is arranged, the smoke detection unit cover has a plurality of light-shielding wall portions along the circumferential direction, and the light-shielding wall portion is simply. It has a plate shape and an arc-shaped surface portion that forms the outer peripheral surface of the smoke detection region, and a gap that communicates the inside and outside of the smoke detection region is formed between the adjacent light-shielding wall portions, and the sensor portion The light-shielding wall portions are arranged so as to overlap each other in the radial direction so that any of the light-shielding wall portions is located on the radiation centered on the detection position, and the accommodating means is arranged in a direction along the mounting surface. It has a first inflow opening extending to the inside, and has a first inflow opening for allowing the gas to flow into the inside of the accommodating means, and the detecting means has the smoke detection unit and the inspection means. A detection space is provided inside the smoke unit, and the detection means is configured to detect the smoke existing in the detection space, and the mounting surface along a direction orthogonal to the mounting surface. The distance from the detection space to the detection space, that is, the distance from the detection space to the farthest point from the mounting surface is from the mounting surface along the direction orthogonal to the mounting surface to the first inflow opening. The distance is set to be shorter than the distance to the portion of the first inflow opening closest to the mounting surface, and any part of the detection space is located at the first inflow opening. The detection space is provided on the mounting surface side of the first inflow opening so as not to cause smoke.
It is characterized by that.

The fire alarm according to claim 2 is the fire alarm according to claim 1, wherein the light-shielding wall portion is inclined in the radial direction from the base of the smoke detection portion cover along the circumferential direction of the smoke detection region. It is characterized in that it is arranged and erected so as to do so.

The fire alarm according to claim 3 is the fire alarm according to claim 1 or 2, wherein a light emitting portion is arranged in the smoke detection region and receives light from at least the light emitting portion of the light shielding wall portion. The surface is characterized in that an uneven shape is formed.

The fire alarm according to claim 4 is the fire alarm according to any one of claims 1 to 3, wherein the arc-shaped surface portion of the plurality of light-shielding wall portions serves as the outer peripheral surface of the smoke detection region. It is characterized by forming an intermittent surface along the outer circumference .

According to the invention of claim 1, it is possible to prevent light from directly incident on the sensor unit from the outside while keeping the diameter of the smoke detection unit cover to a minimum.
In addition, the smoke detection unit can be miniaturized while maintaining the function of blocking light from external light, and the smoke detection unit cover can be arranged so as not to overlap with the speaker or the like in the miniaturized housing.
Further, an intermittent circumferential surface can be formed on the outer peripheral side of the light-shielding wall portion, and the net member can be arranged on the outer peripheral side.

According to the second aspect of the present invention, adjacent light-shielding wall portions can be arranged so as to overlap each other in the radial direction while providing a gap between the light-shielding wall portions.

According to the invention of claim 3 , since the light from the light emitting portion is scattered by the uneven shape of the light-shielding wall portion, the reflected light of the light from the light emitting portion incident on the sensor portion is reduced, and the sensor portion. It is possible to prevent malfunction in.

It is a perspective view seen from the front side of the fire alarm of this Embodiment 1. It is a perspective view seen from the back side of a fire alarm. It is a rear view of the alarm body. It is a front view of the mounting plate. It is a perspective view of the screw tightened to the installation surface and a mounting plate. It is a vertical sectional view of a fire alarm. It is a front view of the fire alarm in this Embodiment 2-1. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 7 is a cross-sectional view taken along the line BB of FIG. It is a front view of the substrate part. It is a front view of the board part which attached the speaker. 11 is a cross-sectional view taken along the line AA of FIG. It is a front view of the substrate part used for the fire alarm of Embodiment 2-2. It is a front view of the substrate part used for the fire alarm of Embodiment 2-3. It is a front view of the fire alarm in the third embodiment. FIG. 15 is a cross-sectional view taken along the line AA of FIG. It is a front view of the operation button. It is a side view of the operation button. FIG. 17 is a cross-sectional view taken along the line AA of FIG. It is a perspective view which looked at the operation button from the back side. It is a perspective view from the back side of a fire alarm. FIG. 21 is an enlarged view of the vicinity of the rear extension portion in FIG. It is an enlarged view of the lower part of the housing in the BB cross section of FIG. FIG. 5 is an enlarged cross-sectional view of the lower portion of the housing in a state where the operation button is pressed from the state of FIG. It is a perspective view seen from the front side of the fire alarm device in Embodiment 4. It is a vertical sectional view of a fire alarm. It is a perspective view of the substrate part which has a smoke detection part. It is sectional drawing which showed the inside of the smoke detection part. FIG. 28 is an enlarged view of a range in which the detection position of the sensor portion and the light-shielding wall portion directly face each other. It is a perspective view of the alarm device which concerns on this Embodiment 5. It is a bottom view of the alarm device. It is a side view of the alarm device. FIG. 31 is a cross-sectional view taken along the line AA of FIG. 31. It is an exploded perspective view of the alarm device seen from the lower side. It is an exploded perspective view of the alarm device seen from the upper side. It is a bottom view of the mounting base. It is a top view of the mounting base. It is a bottom view of the back case. It is a top view of the back case. It is a front view of a back case. It is a top view of the front case. It is a front view of the front case. It is a bottom view of the detection part cover. It is a front view of the detection part cover in the state where the insect repellent net is omitted. It is the bottom view of the detection part main body. It is a top view of the detection part main body. It is a front view of the detection part main body. It is the bottom view of the circuit part. It is a top view of the circuit part. It is a front view of a circuit part. It is an enlarged perspective view of the detection part main body. FIG. 32 is a cross-sectional view taken along the line BB of FIG. 32. FIG. 52 is a cross-sectional view taken along the line CC of FIG. 52. It is a perspective view of a circuit board. It is sectional drawing which shows the circuit board and the mounting jig. It is a perspective view which shows the mounting jig in the initial state. It is a perspective view which shows the mounting jig in the state which the light emitting part, the light receiving part, and the shield are arranged in the mounting jig. It is a perspective view which shows the mounting jig with the circuit board mounted. It is a perspective view which shows the mounting jig with the top lid closed.

[Embodiment 1]
Embodiment 1 of the present invention will be described in detail with reference to the drawings. In the first embodiment, it is assumed that the device attached to the installation surface is a fire alarm. FIG. 1 shows a perspective view seen from the front side of the fire alarm according to the first embodiment, and FIG. 2 shows a perspective view seen from the back side of the fire alarm. The fire alarm of the first embodiment has an alarm main body 1 that detects the occurrence of a fire and issues an alarm, and a mounting plate 2 that attaches the alarm main body 1 to the installation surface.

The alarm body 1 has a housing 10 having a sensor or the like for detecting smoke inside. The housing 10 has a smoke inlet 12 on the side surface portion, and guides smoke from the smoke inlet 12 to the inside of the housing 10 and detects the smoke by a sensor.

The housing 10 has a front surface 11 facing the indoor side, and the front surface 11 has an operation button 13 for performing various operations and an acoustic hole for emitting sound from a speaker provided inside the housing 10. 14 is provided.

The mounting plate 2 is provided on the back side of the alarm body 1, and can fix the alarm body 1. The installation surface to which the mounting plate 2 is fixed is the wall surface of the house in the first embodiment. After the mounting plate 2 is fixed to the installation surface which is a vertical surface, the alarm body 1 is mounted and fixed to the mounting plate 2.

The mounting plate 2 has an alarm fixing surface portion 20 formed in a substantially ring shape having a hole in the central portion. An upper protruding portion 21 is formed at the upper end portion of the alarm fixing surface portion 20. The upper protrusion 21 is used when there is a place to be hooked on the installation surface in advance, but is not used in the first embodiment. A groove-shaped notch is formed at the root portion of the upper protruding portion 21, and when the upper protruding portion 21 is not used, this can be easily broken and removed.

FIG. 3 shows a rear view of the alarm main body 1. On the back surface of the alarm body 1, a battery storage portion 16 is formed at an upper portion, and a battery 17 is stored inside the battery storage portion 16. The battery housing portion 16 is formed in a concave shape that opens on the back side, and the opening is not covered with a lid. As a result, the housing 10 is made thinner by the thickness of the lid. Further, on the back surface of the alarm body 1, mounting plate fixing portions 15 are formed at three locations in the circumferential direction. The mounting plate fixing portion 15 is formed so that it can be rotationally locked to the mounting plate 2.

The structure of the mounting plate 2 will be described in more detail. FIG. 4 shows a front view of the mounting plate 2. On the alarm fixing surface portion 20 of the mounting plate 2, locking piece portions 24 are formed in a claw shape at three locations along the circumferential direction. The locking piece portion 24 is formed at a position corresponding to the mounting plate fixing portion 15 formed on the back surface portion of the alarm body 1, and can be rotationally locked.

Further, the alarm fixing surface portion 20 is provided with a plurality of screw hole portions 22 through which screws for fixing the mounting plate 2 to the installation surface can be inserted. In the first embodiment, of the plurality of screw hole portions 22, the screw hole portion 22 located in the upper 12 o'clock direction is used, and therefore the screw hole portion 22 will be described below.

The screw hole portion 22 has a large diameter at the lower portion and a small diameter at the upper portion, and has a continuous gourd-like shape. A rising portion 23 rising from the alarm fixing surface portion 20 is formed around the screw hole portion 22 so as to surround the screw hole portion 22. The rising portion 23 is formed so as to form a substantially elliptical shape when viewed from the front.

FIG. 5 shows a perspective view of the screw 30 tightened to the installation surface and the mounting plate 2. The screws 30 are pre-tightened to a certain position with respect to the installation surface. At this time, the head 31 of the screw 30 is in a floating state from the installation surface.

The screw hole portion 22 of the mounting plate 2 has a large diameter portion at the lower portion having a diameter through which the head 31 of the screw 30 can be inserted. Therefore, the screw 30 can be inserted through the lower portion of the screw hole portion 22, and the screw 30 can be made to penetrate the front surface side of the mounting plate 2. From this state, the mounting plate 2 is slid downward to position the screw 30 in the small diameter portion above the screw hole portion 22. Since the small diameter portion of the screw hole portion 22 is larger than the diameter of the screw 30 and smaller than the diameter of the head 31, the screw 30 is further tightened by locating the screw 30 in the small diameter portion of the screw hole portion 22. Therefore, the head portion 31 of the screw 30 can be pressed against the peripheral edge of the screw hole portion 22, and the mounting plate 2 can be fixed to the installation surface by the screw 30.

At this time, the screw 30 is tightened to a position where the head 31 of the screw 30 does not protrude from the surrounding rising portion 23. That is, when the mounting plate 2 is viewed from the side, the screw 30 is tightened until the head 31 is completely hidden by the rising portion 23. In this way, the rising portion 23 can also be used as a guideline for the depth at which the screw 30 is tightened.

FIG. 6 shows a vertical cross-sectional view of the fire alarm. The screw 30 is also shown in this figure. In a state where the mounting plate 2 is fixed to the installation surface by the screw 30, the head portion 31 of the screw 30 does not exceed the height of the rising portion 23 formed around the screw hole portion 22. That is, the height of the rising portion 23 is set so that the head 31 of the screw 30 does not protrude toward the front side of the rising portion 23.

The screw hole portion 22 for fixing the screw 30 is located above the mounting plate 2, and the battery 17 housed in the battery storage portion 16 of the alarm body 1 and the head 31 of the screw 30 face each other. Here, since the rising portion 23 having a height that does not project the head 31 is formed around the head 31 of the screw 30, the battery 17 does not come into contact with the head 31 of the screw 30. Can be done. That is, the head 31 of the screw 30 exposed from the mounting plate 2 to the front side can be prevented from affecting the alarm body 1.

Although the first embodiment of the present invention has been described above, the application of the present invention is not limited to the first embodiment, and various applications can be made within the scope of the technical idea thereof. For example, in the first embodiment, the height of the rising portion 23 is set to be approximately the same as the protruding height of the head 31 of the screw 30, but the rising portion 23 may be higher than the protruding height of the head 31. , It may be formed higher so as not to interfere with the alarm body 1. Further, the positions and the number of the screw hole portions 22 and the rising portions 23 are not limited to the first embodiment, and can be appropriately arranged as needed. Further, although the installation surface is a wall surface in the first embodiment, it may be a ceiling surface. Further, although the device is a fire alarm in the first embodiment, it may be another type of device such as a gas alarm.

[Embodiment 2]
Next, Embodiments 2-1 to 2-3 of the present invention will be described in detail with reference to the drawings. In the present embodiment 2-1 to 2-3, the alarm will be described as a fire alarm. FIG. 7 shows a front view of the fire alarm in the present embodiment 2-1. The fire alarm of the present embodiment 2-1 has an alarm main body 201 that detects the occurrence of a fire and issues an alarm.

The alarm body 201 has a housing 210 having a sensor or the like for detecting smoke inside. The housing 210 has a smoke inlet on the side surface, guides smoke from the smoke inlet to the inside of the housing 210, and detects smoke by an internal sensor.

The housing 210 has a front portion 211 facing the indoor side, and the front portion 211 has an operation button 214 for performing various operations and a speaker 217 provided inside the housing 210 to emit sound. The acoustic hole 215 of the above is provided.

FIG. 8 shows a cross-sectional view taken along the line AA of FIG. On the back surface of the alarm body 201, a battery storage portion 218 is formed at the upper part, and the battery 219 is stored inside the battery storage portion 218. The battery housing portion 218 is formed in a concave shape that opens on the back side, and the opening is not covered with a lid. As a result, the housing 210 is made thinner by the thickness of the lid.

A substrate portion 216 is arranged inside the housing 210, and a smoke detection portion 216a for detecting smoke flowing in from the smoke inflow inlet is provided in the substrate portion 216. Further, although not shown in FIG. 8, the speaker 217 is attached and fixed to the substrate portion 216.

FIG. 9 shows a cross-sectional view taken along the line BB of FIG. As shown in this figure, in the hollow portion formed inside the housing 210, the substrate portion 216 is arranged at a substantially central position in the thickness direction, and the front surface 217a of the speaker 217 fixed to the substrate portion 216 is an acoustic hole. Facing 215. Further, on the back surface side of the substrate portion 216, a space portion is formed between the substrate portion 216 and the rear surface portion 212 of the housing 210. Of the rear surface portion 212 of the housing 210, the region forming this space portion does not have a hole or the like and is closed.

FIG. 10 shows a front view of the substrate portion 216. As shown in this figure, the substrate portion 216 has a substantially circular shape with a part missing, and a sensor 216b for detecting smoke is arranged in the central portion. A speaker fixing portion 220 is formed on the peripheral portion of the substrate portion 216, and the speaker 217 is fixed here.

The speaker fixing portion 220 has a substantially circular rising portion 221 with a part missing, and the speaker 217 can be arranged inside the rising portion 221. The inside of the rising portion 221 forms a part of the substrate portion 216 and is a base surface portion 222 facing the back surface of the speaker 2217. A through portion 226 composed of a plurality of small holes is formed in the base surface portion 222.

A substantially T-shaped fixed locking piece 223 is provided on one side of the speaker fixing portion 220. The fixed locking piece portion 223 is integral with the substrate portion 216 and cannot move with respect to the substrate portion 216. Further, on one side of the speaker fixing portion 220 facing the fixed locking piece portion 223, a movable locking piece portion 224 that can move in a predetermined direction with respect to the substrate portion 216 is provided. The fixed locking piece 223 and the moving locking piece 224 are arranged so as to face each other in the radial direction of the speaker 217 fixed to the speaker fixing portion 2220.

The movable locking piece portion 224 is formed at the tip end portion of the elastic piece 225 that is cantileveredly supported by the substrate portion 216. The elastic piece 225 is cantileveredly supported on the outer peripheral portion of the base surface portion 222, whereby the elastic piece 225 can be elastically deformed with respect to the substrate portion 216 in the thickness direction thereof. As a result, the moving locking piece portion 224 can move with respect to the substrate portion 216 in the thickness direction thereof.

FIG. 11 shows a front view of the substrate portion 216 to which the speaker 217 is attached, and FIG. 12 shows a cross-sectional view taken along the line AA of FIG. The speaker 217 has a speaker body 217c having a substantially circular shape, and has a pair of ear portions 217d facing each other in the radial direction on the outer periphery of the speaker body 217c. The selvage portion 217d is formed with a locking recess 217e for locking the fixed locking piece portion 223 or the moving locking piece portion 224.

When attaching the speaker 217 to the speaker fixing portion 220, first, with one ear portion 217d side floating from the base surface portion 222, the locking recess 217e formed in the other ear portion 217d of the speaker 217 is fixed. Locking The locking piece 223 is locked. After that, when one ear portion 217d side is pressed against the moving locking piece portion 224, the elastic piece 225 is elastically deformed, and the moving locking piece portion 224 is locked with respect to the other ear portion 217d. As a result, the speaker 217 is locked to the speaker fixing portion 220 at two locations facing each other in the diameter direction, and the speaker 217 can be stably held by the substrate portion 216.

Since the speaker 217 is elastically locked and fixed to the substrate portion 216 at the selvage portion 217d facing in the radial direction, it is possible to prevent the fixed state of the speaker 217 from changing due to environmental changes such as temperature or humidity. be able to. Further, the speaker 217 is locked and fixed so as to be sandwiched by the fixed locking piece 223 and the moving locking piece 224, but the locking position is the ear portion 217d formed so as to protrude from the outer periphery of the speaker 217. Therefore, it is possible to prevent the speaker body 217c from being deformed and to prevent a decrease in sound pressure.

As shown in FIG. 9, in the speaker 217, the front surface 217a that vibrates and emits sound faces the front side of the substrate portion 216, and the back surface 217b faces the base surface portion 222. Since the base surface portion 222 is formed with a small hole-shaped penetrating portion 226, the back surface 217b of the speaker 217 is formed between the substrate portion 216 and the rear surface portion 212 of the housing 210 via the penetrating portion 226. It faces the space.

When the speaker 217 emits sound, the front surface 217a vibrates to generate sound, and the sound is propagated to the outside through the acoustic hole 215 of the housing 210. On the other hand, the vibration on the front side 217a side of the speaker 217 spreads to the entire speaker 217, and therefore the sound is also transmitted to the back side 217b side of the speaker 217. The sound resonates in the space portion on the rear surface portion 212 side of the housing 210 via the penetration portion 226 formed in the base surface portion 222, and is propagated to the outside.

The effect of sound resonance on the back surface 217b side of the speaker 217 differs depending on the diameter of the speaker 217, the volume and shape of the space on the rear surface 212 side of the housing 210, the area of the penetrating portion 226, and the like. In the present embodiment 2-1 the penetrating portion 226 is formed by a plurality of small holes, so that the area of the penetrating portion 226 can be adjusted so as to maximize the effect of resonance.

Specifically, a large number of small holes are formed in the base surface portion 222 in advance, and in a state where all the parts of the fire alarm are assembled, a sound is emitted from the speaker 217 and the sound pressure thereof is measured. Next, a part of the small holes formed in the base surface portion 222 is closed with a resin or the like, and sound is emitted from the speaker 217 again to measure the sound pressure. By repeating this, the number of small holes having the highest sound pressure is set as the number of small holes in the actual product. When manufacturing an actual product, a step of closing a part of the pre-formed small holes so as to have a set number of small holes is added to the substrate portion 216. This makes it possible to manufacture a fire alarm that maximizes the sound pressure from the speaker 217. The number of small holes may be adjusted individually or set for each production lot. It should be noted that, without making this adjustment, the penetrating portion 226 may be formed by all the same number of small holes.

In this way, the speaker is formed by forming a penetrating portion 226 communicating with the space portion formed between the substrate portion 216 and the rear surface portion 212 of the housing 210 on the base surface portion 222 facing the back surface portion 217b of the speaker 217. The sound pressure from 217 can be increased. That is, even if the diameter of the speaker 217 is reduced, a predetermined sound pressure can be achieved, so that the housing 210 can be miniaturized.

Further, since the penetrating portion 226 is formed by a plurality of small holes, the sound pressure of the speaker 217 can be maximized by adjusting the number of small holes, and since it is a small hole, smoke can be detected. It is also possible to prevent insects and the like from invading the portion 216a side.

Next, Embodiment 2-2 of the present invention will be described. FIG. 13 shows a front view of the substrate portion 230 used in the fire alarm of the second embodiment. In the present embodiment 2-2, the configuration other than the speaker fixing portion 231 provided on the substrate portion 230 is the same as that of the embodiment 2-1. Therefore, only the speaker fixing portion 231 will be described.

The speaker fixing portion 231 has a rising portion 232 that rises from the substrate portion 230 on the outer peripheral portion, and the inner region thereof is a base surface portion 233 that forms a part of the substrate portion 230. A fixed locking piece portion 234 is formed on one side of the base surface portion 233. On the side of the base surface portion 233 opposite to the side on which the fixed locking piece portion 234 is formed, two slit portions 237 extending from the end portion to a position beyond the center of the base surface portion 233 are formed. The two slit portions 237 are formed so as to be parallel to each other and have arc-shaped portions having different diameters. As a result, an elastic piece 236 that can be elastically deformed in the thickness direction of the substrate portion 230 is formed on the base surface portion 233.

At the tip of the elastic piece 236, a moving locking piece 235 is formed so as to face the fixed locking piece 234 and the speaker 217 in the radial direction. The elastic piece 236 of the present embodiment 2-2 is similar to the embodiment 2-1 in that it is cantileveredly supported by the substrate portion 30, but the slit portion 237 forming the elastic piece 236 has one end. Since the elastic piece 236 reaches a position beyond the center of the base surface portion 233 from the portion, the amount of deformation of the elastic piece 236 is larger than that in the case of the second embodiment. Therefore, when the speaker 217 is attached to the speaker fixing portion 231, the movable locking piece portion 235 can be easily locked in the locking recess 217e of the speaker 217, and the attachment work can be facilitated.

Further, the slit portion 237 formed in the base surface portion 233 also functions as a penetrating portion for communicating the back surface 217b of the speaker 217 and the space portion formed on the rear surface portion 212 side of the housing 210. Therefore, the effect of increasing the sound pressure from the speaker 217 can be obtained as in the embodiment 2-1.

Next, Embodiments 2-3 of the present invention will be described. FIG. 14 shows a front view of the substrate portion 240 used in the fire alarm of the second and third embodiments. Also in the present embodiment 2-3, the configuration other than the speaker fixing portion 241 provided on the substrate portion 240 is common to the embodiment 2-1. Therefore, only the speaker fixing portion 241 will be described.

The speaker fixing portion 241 has a rising portion 242 rising from the substrate portion 240 on the outer peripheral portion, and an inner region thereof is a base surface portion 243 forming a part of the substrate portion 240. A fixed locking piece portion 244 is formed on one side of the base surface portion 243. A moving locking piece 245 is formed on the side of the base surface portion 243 opposite to the side on which the fixed locking piece 244 is formed. The movable locking piece portion 245 is formed in an island-shaped portion 246 formed by connecting the substrate portion 240 with the substrate portion 240 by a bridge portion 247 having a small diameter.

Since the island-shaped portion 246 is connected to the substrate portion 240 by a small-diameter bridge portion 247, it is elastic in the plane direction of the substrate portion 240, specifically, in the direction away from the opposite fixed locking piece portion 244. It is possible to move around. As a result, the movable locking piece 245 can be moved. When the speaker 217 is attached to the speaker fixing portion 241, the speaker 217 in which one of the locking recesses 217e is locked to the fixed locking piece portion 244 moves the island-shaped portion 246 due to the elastic deformation of the bridge portion 247. By doing so, the other locking recess 217e can be locked to the moving locking piece 245.

Further, a gap portion 248 is formed between the island-shaped portion 246 and the substrate portion 240. Of these, the gap portion 248 formed on the center position side of the base surface portion 243 of the island-shaped portion 246 is arranged in the base surface portion 243, so that it is formed on the back surface 217b of the speaker 217 and the rear surface 212 side of the housing 210. It also functions as a penetrating part that communicates with the space part. Therefore, the effect of increasing the sound pressure from the speaker 217 can be obtained as in the embodiment 2-1.

Although the embodiments 2-1 to 2-3 of the present invention have been described above, the application of the present invention is not limited to the embodiments 2-1 to 2-3, and various applications are made within the scope of the technical idea thereof. Can be done. For example, in the above-described embodiments 2-1 to 2-3, the speaker fixing portion 220 has one fixed locking piece portion 223 and one moving locking piece portion 224, which are arranged to face each other. However, three or more locking pieces may be arranged at a plurality of locations in the circumferential direction of the speaker 217. In this case, at least one locking piece can be a moving locking piece and the other locking piece can be a fixed locking piece.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. In the third embodiment, the alarm device will be described as a fire alarm device. FIG. 15 shows a front view of the fire alarm according to the third embodiment. The fire alarm of the third embodiment has an alarm main body 301 that detects the occurrence of a fire and issues an alarm.

The alarm main body 301 has a housing 310 having a sensor or the like for detecting smoke inside. The housing 310 has a smoke inlet on the side surface, guides smoke from the smoke inlet to the inside of the housing 310, and detects the smoke by a sensor.

The housing 310 has a front surface 311 facing the indoor side, and the front surface 311 has an operation button 313 for performing various operations and an acoustic hole for emitting sound from a speaker provided inside the housing 310. 314 and are provided. An opening 310a is formed in the housing 310 in order to arrange the operation button 313 and expose it to the front side.

When starting to use the fire alarm, the power can be turned on by first pressing the operation button 313. When the power is turned on, the fire alarm starts detecting a fire. Further, after the power is turned on, the sensor can be tested by pressing the operation button 313 in the normal state. Normal tests can also be performed on dead batteries, replacement deadline messages, and speaker disconnections. Further, when a fire is detected by the sensor and an alarm is issued, the alarm can be stopped by pressing the operation button 313. In this way, the operation button 313 can cause the fire alarm to perform different operations depending on the situation with one pressing operation.

FIG. 16 shows a cross-sectional view taken along the line AA of FIG. As shown in this figure, a battery storage portion 316 is formed in the upper portion on the back surface of the alarm main body 301, and the battery 317 is stored inside the battery storage portion 316. The battery housing portion 316 is formed in a concave shape that opens on the back side, and the opening is not covered with a lid. As a result, the housing 310 is made thinner by the thickness of the lid.

The operation button 313 has an operation unit 320 exposed from the opening 310a of the housing 310. The operation unit 320 is substantially flush with the front surface 311 of the housing 310, and the operation unit 320 can be operated so as to press the operation unit 320 toward the back side of the housing 310. A switch 318 is arranged in the housing 310 so as to face the operation unit 320 of the operation button 313, and the switch 318 is pressed as the operation button 313 is pressed. When the switch 318 is pressed, the fire alarm can detect the pressing operation of the operation button 313.

The configuration of the operation button 313 will be described in more detail. 17 is a front view of the operation button 313, FIG. 18 is a side view of the operation button 313, FIG. 19 is a sectional view taken along the line AA of FIG. 17, and FIG. 20 is a rear view of the operation button 313. The perspective views are shown respectively. The operation button 313 is a pair of an operation unit 320 formed in a substantially elliptical shape in the front view, which is long in the vertical direction, and a pair of outward extension portions 321 hanging downward from the lower end portion which is one end of the operation unit 320. It has an elastic piece 323 that hangs downward from the lower end of the operation unit 320 between the outer extension portions 321 and a rear extension portion 325 that extends from the operation portion 320 toward the back surface side. The two outward extending portions 321 and the rear extending portion 325 are integrated to form a substantially U-shaped cross section that opens downward.

Rotating shaft portions 322 protruding sideways are formed on the outwardly extending surfaces of the outward extending portion 321. The rotating shaft portion 322 is rotatably locked to the bearing portion 310b of the housing 310. As a result, the operation button 313 can rotate in the direction of tilting toward the back side with the rotation shaft portion 322 as the center.

As shown in FIG. 19, the elastic piece 323 is formed in a thin plate shape and can be elastically deformed along the pressing direction of the operating portion 320. A locking portion 324 projecting to the front side is formed at the tip of the elastic piece 323. As shown in FIG. 16, the locking portion 324 is locked to the locking receiving portion 310c formed near the lower end of the inner surface of the housing 310. In this locked state, the elastic piece 323 is slightly urged in the direction in which the operation button 313 returns from pressing, that is, on the front side of the alarm body 301.

The operation button 313 has an edge portion 328 around the operation unit 320. Further, the housing 310 has a step portion 310d at the edge portion of the opening 310a, and the edge portion 328 of the operation button 313 is in contact with the step portion 310d from the back surface side. As described above, since the operation button 313 is urged to the front side of the alarm body 301 by the elastic piece 323, the edge portion 328 of the operation button 313 is in a state of being pressed against the step portion 310d of the housing 310. It has become. As a result, it is possible to prevent the operation button 313 from wobbling or falling off due to an unexpected force.

The elastic piece 323 is originally urged in the return direction of the operation button 313 in this way, but when the operation button 313 is pressed and tilted about the rotating shaft portion 322, the locking portion 324 at the lower end is molded. Since it is locked to the body 310, it is elastically deformed so as to warp toward the back side, and the operation button 313 is urged in the return direction with a stronger force.

As shown in FIG. 20, the rear extending portion 325 is formed with a lateral slit portion 326 in the vicinity of the rear end. FIG. 21 shows a perspective view from the rear side of the fire alarm. As shown in this figure, the rear extension portion 325 of the operation button 313 is exposed on the back side of the housing 310.

FIG. 22 shows an enlarged view of the vicinity of the rear extension portion 325 in FIG. 21. In this figure, a state in which the drawstring 330 is attached to the rear extension portion 325 is shown. The tip of the drawstring 330 can be inserted through the slit 326. A knot is formed at the tip of the drawstring 330, and the width of the slit portion 326 is set to be larger than the diameter of the drawstring 330 and smaller than the diameter of the knot. Therefore, a knot is formed in advance at the tip of the drawstring 330, a portion of the drawstring 330 opposite to the tip side of the knot is inserted into the slit portion 326, and the drawstring 330 is pulled downward. The drawstring 330 can be easily attached to the operation button 313. Since the slit portion 326 to which the drawstring 330 is attached is formed rearward and upward with respect to the rotary shaft portion 322, by pulling the drawstring 330 downward, the operation button 313 is moved to the back with the rotary shaft portion 322 as the center. It can be rotated in the direction of tilting to the side.

Since the slit portion 326 is formed near the rear end of the rear extending portion 325, the width of the rear end portion 325a, which is a portion between the slit portion 326 and the rear end of the rear extending portion 325, becomes smaller. There is. Therefore, the rear end portion 325a of the rear extending portion 325 can be deformed in the direction of widening the width of the slit portion 326.

When a large force is applied to the drawstring 330, if the force is transmitted to the operation button 313 as it is, the operation button 313 and the housing 310 may be damaged. Since the slit portion 326 can be deformed in the direction of widening, when a large downward force is applied to the drawstring 330, the knot expands the slit portion 326 and pulls out as it is. It is possible to prevent a large force from being applied to the operation unit 320. The magnitude of the force with which the knot of the drawstring 330 is pulled out from the slit portion 326 can be appropriately set according to the strength of the operation button 313 and the housing 310, but in the third embodiment, it is about 8 to 10 kg.

FIG. 23 shows an enlarged view of the lower part of the housing 310 in the BB cross section of FIG. As shown in this figure, a U-shaped bearing portion 310b that opens upward is formed inside the housing 310, and the rotating shaft portion 322 of the operation button 313 is housed in the bearing portion 310b so that it can rotate freely. It has become.

FIG. 24 shows an enlarged cross-sectional view of the lower part of the housing 310 in a state where the operation button 313 is pressed from the state of FIG. Since the operation button 313 is rotatable about the rotation shaft portion 322 located below, when the operation unit 320 is pressed, the upper side of the operation unit 320 is tilted toward the back side as shown in FIG. 24. Then, the operation unit 320 presses the switch 318 in the housing 310. At this time, as described above, the elastic piece 323 of the operation button 313 urges the operation button 313 in the returning direction by locking the locking portion 324 to the locking receiving portion 310c of the housing 310. However, it is elastically deformed so as to further urge the operation button 313 in the returning direction from that state. Therefore, when the hand is released from the operation unit 320, the operation button 313 can return to the original position. When the drawstring 330 is attached to the rear extension portion 325 and the drawstring 330 is pulled, the operation button 313 operates in the same manner.

In this way, by configuring the push button with the housing 310 having the bearing portion 310b and the operation button 313 which is integrated as a whole and has the rotating shaft portion 322, the pressing operation and the returning operation can be performed with a simple structure. it can. In addition, since the number of parts is small, it is possible to suppress variations in pressing operations due to component tolerances.

Further, since the rotation shaft portion 322, which is the rotation center of the operation button 313, is formed on the outward extending portion 321 below the operation portion 320 to be pressed, the pressing depth of the operation portion 320 is sufficiently sufficient. Can be secured. In particular, since the operating portion 320 has a substantially elliptical shape that is long in the vertical direction, the distance from the rotating shaft portion 322 can be increased and the pressing depth can be increased.

Further, an elastic piece 323 having a locking portion 324 at the tip portion is formed at the lower portion of the operation button 313, and the locking portion 324 is locked to the housing 310, so that when the operation portion 320 is pressed, the operating portion 320 is pressed. Since the elastic piece 323 is elastically deformed and the operation button 313 is urged in the returning direction, the operation button 313 can be restored when the hand is released from the operation unit 320. Further, the elastic piece 323 urges the operation button 313 in the return direction in a state where the locking portion 324 is locked to the housing 310, and the edge portion 328 of the operation button 313 is rearward to the stepped portion 310d of the housing 310. Since it is in contact from the side, it is possible to prevent the operation button 313 from wobbling or coming off the housing 310 and falling off.

Although the third embodiment of the present invention has been described above, the application of the present invention is not limited to the third embodiment, and various applications can be made within the scope of the technical idea thereof. For example, the position, size, and shape of the operation button 313 in the alarm body 301 are not limited to the third embodiment. In the third embodiment, the operation button 313 has a long shape in the vertical direction, but may have a long shape in the horizontal direction, or may have a circular shape or a quadrangular shape. Further, the position of the rotation shaft portion 322 of the operation button 313 is not limited to the lower end portion, and may be the upper end portion, the left and right end portions, or the like. Further, in the third embodiment, the alarm device is a fire alarm device, but it may be another type of alarm device such as a gas alarm device.

[Embodiment 4]
Finally, Embodiment 4 of the present invention will be described in detail with reference to the drawings. FIG. 25 shows a perspective view of the fire alarm according to the fourth embodiment as viewed from the front side. The fire alarm of the fourth embodiment has an alarm main body 401 that detects the occurrence of a fire and issues an alarm, and a mounting plate 402 that attaches the alarm main body 401 to the installation surface.

The alarm body 401 has a housing 410 having a sensor or the like for detecting smoke inside. The housing 410 has a smoke inlet 412 on the side surface, guides smoke from the smoke inlet 412 to the inside of the housing 410, and detects the smoke by a sensor.

The housing 410 has a front surface 411 facing the indoor side, and the front surface 411 has an operation button 413 for performing various operations and an acoustic hole for emitting sound from a speaker provided inside the housing 410. 414 is provided.

The mounting plate 402 is provided on the back side of the alarm main body 401, and the alarm main body 401 can be fixed. The installation surface to which the mounting plate 402 is fixed is the wall surface of the house in the fourth embodiment. However, the installation surface such as the ceiling surface of the house may be another surface. After the mounting plate 402 is fixed to the installation surface which is a vertical surface, the alarm main body 401 is mounted and fixed to the mounting plate 402.

FIG. 26 shows a vertical cross-sectional view of the fire alarm. The mounting plate 402 has a screw hole portion 421, and is fixed to the installation surface by a screw 22 inserted through the screw hole portion 421. Further, the mounting plate 402 has an alarm fixing surface portion 420 for fixing the back side of the alarm main body 401. The alarm body 401 is locked and fixed to the alarm fixing surface portion 420.

The alarm main body 401 has a battery storage unit 416 in the upper part of the housing 410, and the battery 417 is housed in the battery storage unit 416. Further, inside the housing 410, a smoke detection unit 430 for detecting the smoke flowing in from the smoke inflow inlet 412 is arranged. The smoke detection unit 430 is provided on the substrate unit 432 housed in the housing 410, has a smoke detection area 431 for blocking light from the outside and detecting invading smoke, and has the smoke detection area 431. It has a smoke detector cover 433 to cover.

FIG. 27 shows a perspective view of the substrate portion 432 having the smoke detection portion 430. As shown in this figure, the substrate portion 432 has a substantially circular shape with a part missing, and is provided so that the smoke detection portion cover 433 covers the central portion. The top surface of the smoke detector cover 433 is a circular base 440. A net member 434 for preventing insects and the like from invading the smoke detection area 431 is provided on the outer peripheral surface portion of the smoke detection unit cover 433. Further, a speaker accommodating portion 432a for accommodating and fixing the speaker 418 is formed on the peripheral portion of the substrate portion 432.

FIG. 28 shows a cross-sectional view showing the inside of the smoke detection unit 430. A plurality of light-shielding wall portions 441 are erected on the smoke detection portion cover 433 from the base portion 440 toward the substrate portion 432. As shown in this figure, the light-shielding wall portion 441 of the smoke detection portion cover 433 has a veneer shape extending in one direction, and the plurality of light-shielding wall portions 441 cover the entire circumference of the smoke detection region 431. Surrounding. The extending direction of the light-shielding wall portion 441 is oriented in both the circumferential direction and the radial direction of the smoke detection region 431. A gap is provided between the light-shielding wall portions 441 so that smoke can enter the smoke detection area 431. On the other hand, one end portion 441a of the light-shielding wall portion 441 and the other end portion 441b of the adjacent light-shielding wall portion 441 are arranged so as to overlap each other in the circumferential direction.

An arcuate surface portion 441c forming the outer peripheral surface of the smoke detection region 431 is formed on the outer peripheral surface of one end portion 441a of the light-shielding wall portion 441. The arc-shaped surface portion 441c forms an intermittent circumferential surface due to the plurality of light-shielding wall portions 441. Along the arcuate surface portion 441c, the net member 434 is arranged and fixed so as to form the outer peripheral surface of the smoke detection portion cover 433.

Inside the smoke detection area 431, a light emitting unit 435 and a sensor unit 436 are arranged at the installation base 437. The light emitting unit 435 is composed of a laser diode, an infrared LED, or the like capable of emitting light, and is arranged so as to face the upper center side of the smoke detection area 431. The sensor unit 436 is arranged on the opposite side across the center of the smoke detection area 431 and faces the upper center side of the smoke detection area 431. The sensor unit 436 is composed of a photodiode or the like that can detect the light incident on the detection position 436a.

Since the light from the light emitting unit 435 is emitted diagonally upward of the sensor unit 436, the light is not normally detected by the sensor unit 436. On the other hand, when smoke enters the smoke detection region 431, the light from the light emitting unit 435 is scattered by the smoke, and a part of the light is incident on the detection position 436a of the sensor unit 436. As a result, the sensor unit 436 can detect the light and detect the presence of smoke.

The smoke detection area 431 is surrounded by a light-shielding wall portion 441 so that light from the outside cannot enter, and the light-shielding wall portion 441 is formed of a material that hardly reflects light. ing. However, since the light-shielding wall portion 441 facing the light-emitting portion 435 directly receives the strong light from the light-emitting portion 435, a part of the light is reflected. When the reflected light is incident on the sensor unit 436, the sensor unit 436 may detect the light even though there is no smoke. In order to prevent this, a concave-convex surface portion 441d is formed on the inner peripheral surface of the light-shielding wall portion 441 that receives the light from the light emitting portion 435. When light is reflected by the uneven surface portion 441d, the light is scattered by the unevenness, so that the amount of reflected light incident on the detection position 436a of the sensor portion 436 can be reduced and malfunction can be prevented.

FIG. 29 shows an enlarged view of the vicinity of the smoke detection area 431 in FIG. 28. Of the lines extending radially from the detection position 436a of the sensor unit 436, the line passing through the other end portion 441b of the light shielding wall portion 441 is on the outer peripheral side of the other end portion 441b of the light shielding wall portion 441 and is adjacent to the light shielding wall portion 441. It intersects with one end 441a. For example, the line of the broken line R1 passes through the other end portion 441b of the light-shielding wall portion 441 and extends over the one end portion 441a of the adjacent light-shielding wall portion 441. The same applies to the broken line R2 and the broken line R3. Further, the same applies to the light-shielding wall portion 441 other than those shown by the broken lines R1 to R3. That is, one of the light-shielding wall portions 441 is always located on the radiation centered on the detection position 436a of the sensor portion 436. As described above, the light-shielding wall portion 441 is arranged so that the light incident on the smoke detection region 431 from the outside does not directly reach the detection position 436a of the sensor portion 436.

In this way, the light-shielding wall portions 441 are arranged so as to overlap each other in the radial direction so that any of the light-shielding wall portions 441 is located on the radiation centered on the detection position 436a of the sensor unit 436. The light from the outside passing through the gap between the light-shielding wall portions 441 does not directly reach the detection position 436a of the sensor unit 436, and the sensor unit 436 detects only the scattered light from the light emitting unit 435. Therefore, it is possible to reliably prevent the sensor unit 436 from malfunctioning due to external light. Further, the light-shielding wall portion 441 can prevent not only the detection position 436a of the sensor portion 436 but also the incident of external light into the central region of the smoke detection region 431. In the smoke detection region 431, when external light is incident on the region between the light emitting unit 435 and the sensor unit 436, it is scattered by low-concentration smoke or the like, and the light is not directly incident on the detection position 436a of the sensor unit 436. However, there is a possibility that it is indirectly incident on this and causes a malfunction, but since the incident of external light on the central region of the smoke detection region 431 is blocked by the light-shielding wall portion 441, the malfunction can be prevented.

The light-shielding wall portion 441 has a veneer shape extending in one direction, and the overlapping of the light-shielding wall portions 441 in the radial direction is also minimized, so that the diameter of the smoke detection part cover 433 can be reduced. it can. In FIG. 28, the speaker 418 housed in the speaker storage portion 432a is shown by a broken line, but the speaker 418 and the light-shielding wall portion 441 are arranged so as not to overlap each other in the thickness direction of the housing 410. Therefore, the sound from the speaker 418 is not blocked by the light-shielding wall portion 441, and the sound pressure at the time of alarm can be sufficiently secured. Further, since the diameter of the smoke detection unit cover 433 can be reduced, the size of the alarm main body 401 can be reduced.

Although the fourth embodiment of the present invention has been described above, the application of the present invention is not limited to the fourth embodiment, and various applications can be made within the scope of the technical idea thereof.

[Embodiment 5]
(Basic concept of Embodiment 5)
First, the basic concept of the fifth embodiment will be described. A fifth embodiment relates to an alarm device that is generally attached to an installation surface of an object to be installed and has an attachment surface that faces the installation surface. Here, the "alarm device" is a device that gives an alarm, specifically, a device that gives an alarm about a substance to be detected contained in a gas in a monitoring area, for example, a gas alarm. And a concept including a fire alarm (smoke alarm) and the like. The "monitoring area" is an area to be monitored, specifically, an area in which an alarm device is installed, for example, an area in a house (for example, a room), an area in a building other than a house. It is a concept including. Further, the "installation object" is an object to which the alarm device is installed, and examples thereof include a ceiling and a wall in the monitoring area. The "installation surface" is the surface of the installation object on which the alarm device is installed, for example, the surface on the ceiling on the monitoring area side (that is, the lower surface of the ceiling) and the surface on the wall on the monitoring area side (that is, the surface). , The indoor side of the wall) and the like. Further, the "mounting surface" is a surface provided on the alarm device, and specifically, a surface to be mounted on the installation surface in a state of facing the installation surface. Further, the “substance to be detected” is a substance to be detected, specifically, a substance contained in a gas, and is a concept including, for example, carbon monoxide in the gas, smoke, and the like.

In the following embodiment 5, the "detected substance" is "smoke", the "alarm device" is a "fire alarm (smoke alarm)" that gives an alarm based on the scattered light from the smoke, and the "monitoring area". Will be described when "is a room as an area in a house". Further, as the "installation target", as described above, "ceiling" or "wall" and the like can be mentioned, but the case where the "installation target" is the "ceiling" is illustrated below, and the "installation target" is shown. Even if the "thing" is a "wall", it will be taken up and explained as appropriate.

(Constitution)
First, the configuration of the alarm device according to the fifth embodiment will be described. 30 is a perspective view of the alarm device according to the fifth embodiment, FIG. 31 is a bottom view of the alarm device, FIG. 32 is a side view of the alarm device, and FIG. 33 is A of FIG. 31. FIG. 34 is an exploded perspective view of the alarm device viewed from below, and FIG. 35 is an exploded perspective view of the alarm device viewed from above. In the following description, the XYZ directions shown in each figure are directions orthogonal to each other, and specifically, the Z direction is the vertical direction (that is, the direction in which gravity acts), and the X direction and Assuming that the Y direction is a horizontal direction orthogonal to the vertical direction, for example, the Z direction is referred to as the height direction, the + Z direction is referred to as the upper side (plane), and the -Z direction is referred to as the lower side (bottom surface). explain. Further, the following terms related to the "XYZ directions" are convenient expressions for explaining the relative positional relationship (or direction) of each component in the illustrated alarm device 5100. As a result, the direction away from the detection space 534 is referred to as "outside" and the direction approaching the detection space 534 is referred to as "inside" with reference to the central position of the detection space 534 in the case 502 of FIG. 33.

The alarm device 5100 shown in each of these figures is an alarm means for detecting and giving an alarm by detecting smoke, which is a substance to be detected, contained in the gas. Specifically, as shown in FIG. 32, in the ceiling of the monitoring area. An installation surface 5900 that is a lower (-Z direction) surface (that is, a lower surface), or an installation surface (hereinafter, not shown) that is a surface on the monitoring area side (that is, the indoor side surface of the wall) in the wall of the monitoring area. It is used by being mounted on a wall mounting surface), and specifically includes a mounting base 501, a case 502, a detection unit cover 503 in FIG. 34, a detection unit main body 504, and a circuit unit 50505. In the following, the installation surface 5900 extends in the direction along the XY plane (that is, the horizontal direction), and the “wall installation surface” (not shown) is orthogonal to the installation surface 5900 (that is, the vertical direction). The case where it spreads to is described. Hereinafter, the configuration of the entire alarm device 5100 will be described, and then the details of each configuration will be described.

(Configuration-Mounting base)
First, FIG. 36 is a bottom view of the mounting base, and FIG. 37 is a plan view of the mounting base. The mounting base 501 shown in FIG. 32 is a mounting means for mounting the case 502 to the mounting surface 5900 or a “wall mounting surface” (not shown). Specifically, the case 502 and the mounting surface 5900 or not shown are shown. It is used between the "wall mounting surface" of the above, and more specifically, the mounting hook 511 of FIG. 36 and the main body portion 512 are provided.

(Configuration-Mounting base-Mounting hook)
The mounting hook 511 of FIG. 36 is for mounting (that is, installing) the mounting base 501 on the mounting surface 5900 or a “wall mounting surface” (not shown), and specifically, it protrudes from the main body 512. It is a projecting piece and includes, for example, a screw hole 5111. The screw hole 5111 is a hole through which a mounting screw (not shown) for mounting the mounting base 501 is inserted. Then, by continuously inserting the mounting screws through the screw holes 5111 and the installation surface 5900 or the "wall installation surface" (not shown), the mounting base 501 is inserted into the installation surface 5900 or the "wall installation surface" (not shown). Can be attached to.

(Configuration-Mounting base-Main body)
The main body 512 of FIG. 36 is the main body of the mounting base 501, for example, which extends in the direction along the XY plane and has a disk shape having a predetermined diameter, and is integrally formed with the mounting hook 511. More specifically, the case-side facing surface 512A and the installation surface-side facing surface 512B of FIG. 37 are provided. As shown in FIG. 32, the case-side facing surface 512A of FIG. 36 is a surface on which the case 502 is mounted in a state of facing the case 502, and the installation surface-side facing surface 512B is in a state of facing the installation surface 5900. It is a mounting surface to be mounted on the installation surface 5900 (that is, a mounting surface extending in a direction along the XY plane). Further, as shown in FIG. 36, the main body portion 512 includes a screw hole 5121 and an engaging portion 5122. The screw hole 5121 is a hole through which a mounting screw (not shown) for mounting the mounting base 501 is inserted into the mounting surface 5900. Then, the mounting base 501 can be mounted on the installation surface 5900 by continuously inserting the mounting screws through the insertion holes 121 and the installation surface 5900. Further, the engaging portion 5122 is an attaching means to which the case 502 of FIG. 32 is attached, and specifically, it engages with the engaging portion 5214 of the back case 521 described later in FIG. 35. The outer diameter of such a main body 512 can be arbitrarily set, but it is assumed that the outer diameter is set to be the same size as the existing mounting base (for example, about 10 cm). explain.

(Structure-Case)
Next, the case 502 of FIG. 32 is an accommodating means for accommodating the detection unit cover 503, the detection unit main body 504, and the circuit unit 505 (hereinafter, the object to be accommodated) of FIG. 34, specifically, the mounting base 501. It is attached to the installation surface 5900 via the above, and more specifically, the back case 521 and the front case 522 of FIG. 34 are provided.

(Composition-Case-Back case)
38 is a bottom view of the back case, FIG. 39 is a plan view of the back case, and FIG. 40 is a front view of the back case. As shown in FIG. 34, the back case 521 in each of these drawings is a first storage means for storing the “object to be stored” from the mounting base 501 side (that is, the upper side (+ Z direction)), and is coupled to the front case 522. By doing so, a gap is formed between the front case 522 and the external inflow opening 523, which will be described later in FIG. 32. Further, the back case 521 is an external guiding means for guiding the gas moving outside the case 502 of FIG. 33 (including the gas moving along the installation surface 5900) to the inside of the case 502, and also. It is an internal guiding means for guiding the gas moving inside the case 502 to the detection space 534 described later, and specifically, it forms a gas flow path with the detection unit main body 504.

The back case 521 of FIGS. 38 to 40 is, for example, widened in the direction along the XY plane and has a disk shape having a diameter larger than that of the mounting base 501 (“back case 521” described later). It is made of resin and is integrally formed as a whole (including the internal member of the), and more specifically, it includes a back case side facing wall 5211 and a back case side outer peripheral wall 5212. The back case side facing wall 5211 of FIG. 33 forms a portion of the back case 521 that extends in the direction along the XY plane, that is, faces the mounting base 501, and is the guide recess 5211a of FIG. 34. To be equipped. The induction recess 5211a is an induction means for inducing a gas into the detection space 534 of FIG. 33, and the details thereof will be described later. Further, the back case side outer peripheral wall 5212 is a first outer wall forming a portion (outer wall) extending in the height direction (Z direction) of the back case 521, and is outside from the outer edge portion of the back case side facing wall 5211. It extends toward the lower side (-Z direction) while spreading toward.

Further, in more detail, the back case 521 of FIG. 38 includes a component case 5611 to 5616, short fins 5621 to 5623, long fins 5631, 5632, prevention pieces 5641, 5642, and ribs 5651 to 5569 (hereinafter, "configuration"). The product case 5611 to 5616, short fins 5621 to 5623, long fins 5631, 5632, prevention pieces 5641, 5642, and ribs 5651 to 5569 "are collectively referred to as" internal members of the back case 521 "). First, the component cases 5611 to 5616 are accommodating means for accommodating the components constituting the alarm device 5100, and specifically, accommodating the component accommodating space which is a space for accommodating the components. It has a wall. Further, the component cases 5611 to 5616 (specifically, the accommodating walls of the component cases 5611 to 5616) are guiding means for guiding the gas to the detection space 534 of FIG. 33, and function as the guiding means. , It is provided in consideration of the location of the components. Further, the short fins 5621 to 5623 are guiding means for guiding the gas into the detection space 534 of FIG. 33, and specifically, are protrusions extending from the component cases 5611 to 5623 of FIG. 38. Further, the long fins 5631 and 5632 are guiding means for guiding the gas into the detection space 534 of FIG. 33, and specifically, are pieces extending from the ribs 5657 and 5569 of FIG. 38, which will be described later, from the short fins 5621. Is long enough. Further, the prevention pieces 5641 and 5642 are guiding means for guiding the gas into the detection space 534 of FIG. 33, and dust contained in the gas flowing into the inside through the slits 5213a and 5213b described later in FIG. 38. Is a preventive means for preventing the invasion of the detection space 534 of FIG. 33. The ribs 5651 to 5569 in FIG. 38 are guiding means for guiding the gas to the detection space 534, and are reinforcing means for reinforcing the back case 521, and between the front case 522 and the back case 521 in FIG. 35. It is a position-determining means for determining the relative positional relationship (that is, the width of the external inflow opening 523 of FIG. 32) in the height direction (Z direction) of the above, and specifically, the external inflow opening 523 and the case 502 of FIG. 32. It is intended to partition the inside of the above, and is provided on, for example, the back case side facing wall 5211. The "width of the external inflow opening 523" indicates the distance from the upper end to the lower end of the external inflow opening 523. Further, in the following description, when it is not necessary to distinguish the ribs 565 to 5569 from each other, they are appropriately collectively referred to as "rib 565", and the details of the "internal member of the back case 521" will be described later.

(Structure-Case-Front case)
FIG. 41 is a plan view of the front case, and FIG. 42 is a front view of the front case. As shown in FIG. 34, the front case 522 of each of these figures accommodates the "accommodation object" from the side opposite to the mounting base 501 side (that is, the lower side (+ Z direction)) with the "accommodation object" in between. This is the second accommodating means, and specifically, by being coupled with the back case 521, a gap as the external inflow opening 523 of FIG. 32 is formed between the back case 521 and the back case 521. Here, the "external inflow opening" 23 is an inflow means for allowing the gas outside the case 502 to flow into the inside of the case 502, and in particular, the gas moving along the installation surface 5900 outside the case 502 is the case. It is the first inflow opening that flows into the inside of the 502, and is a gap formed between the back case 521 and the front case 522 of the case 502 so as to extend in the direction along the XY plane. The width of the external inflow opening 523 can be arbitrarily set in consideration of preventing dust, ambient light, or the intrusion of the user's finger, and the impression given to the user by the appearance of the alarm device 5100. , Here, for example, it will be described below assuming that it is set to 3 to 5 (mm). Further, the front case 522 is an external guiding means for guiding the gas moving outside the case 502 of FIG. 33 (including the gas moving along the installation surface 5900) to the inside of the case 502.

The front case 522 of FIGS. 41 and 42, for example, extends in a direction along the XY plane and has a disk shape having a diameter larger than that of the back case 521, and is integrally formed as a whole. It is made of a resin, and more specifically, it includes an exposed wall 5221 on the front case side and an outer peripheral wall 5222 on the front case side. First, the front case side exposed wall 5221 forms a portion of the front case 522 that extends in the direction along the XY plane, that is, is exposed so as to be mainly visible to the user. Further, the outer peripheral wall 5222 on the front case side of FIG. 33 is a second outer wall forming a portion (outer wall) extending in the height direction (Z direction) of the front case 522, and is an outer edge of the exposed wall 5221 on the front case side. It extends from the portion toward the outside and extends toward the upper side (+ Z direction).

Further, the front case 522 of FIG. 35 includes a push button 5223, a screw boss 5224, and a support portion 5225 in more detail. First, the push button 5223 is an operating means for operating the alarm device 5100, specifically, for pushing the switch 5555 of the circuit unit 505, which will be described later in FIG. 34, from the outside of the front case 522. Further, the screw boss 5224 of FIG. 35 is a position that determines the relative positional relationship (that is, the width of the external inflow opening 523 of FIG. 32) in the height direction (Z direction) between the front case 522 and the back case 521. It is a determining means, and is also a fixing means for fixing the front case 522 and the back case 521 of FIG. 35 to each other. Specifically, it is provided on the upper (+ Z) surface of the front case side exposed wall 5221. For example, it is provided with a predetermined screw hole and has a pillar shape that stands upright in the height direction (Z direction). Further, the support portion 5225 is a support means for supporting the detection unit main body 504, and specifically, a plurality of support portions 5225 are provided on the front case side outer peripheral wall 5222 side of the upper (+ Z) surface of the front case side exposed wall 5221. It is a piece that is.

(Configuration-Detector cover)
Next, FIG. 43 is a bottom view of the detection unit cover, and FIG. 44 is a front view of the detection unit cover in a state where the insect repellent net is omitted. The detection unit cover 503 in each of these figures is for detecting smoke using scattered light, specifically, is for partitioning the detection space 534 in FIG. 33, and is above the detection unit main body 504. It is provided at (+ Z). The detection unit cover 503, the detection space 534, a part of the detection unit main body 504, the light emitting unit 552 described later, and the light receiving unit 553 correspond to the detection means. As shown in FIG. 34, the detection unit cover 503 has a cylindrical shape in which one of the openings is closed, and more specifically, the detection unit cover 503 includes a ceiling plate 531, a labyrinth 532, and an insect screen 533. Here, the “detection space” 534 in FIG. 33 is a space for detecting smoke. The ceiling plate 531 of FIG. 34 covers the detection space 534. Specifically, the ceiling plate 531 is formed in a disk shape having a diameter smaller than that of the case 502, and the labyrinth 532 is integrated on the lower surface (-Z direction). Is formed. The labyrinth 532 is a partition wall that partitions the detection space 534, and specifically, prevents ambient light from entering the detection space 534. For example, as shown in FIG. 43, the edge of the ceiling plate 531. A plurality of them are provided along the above. With this configuration, an internal inflow opening 535 is formed between adjacent objects in the labyrinth 532. Here, the "internal inflow opening" 535 is a second inflow opening that allows gas to flow into the detection space 534, and is formed as a gap between the labyrinths 532. In the following, when distinguishing each of the plurality of internal inflow openings 535, the reference numerals "535" are followed by the letters "a", "b" and the like, for example, the reference numerals "535a", the reference numeral "535b" and the like. When the plurality of internal inflow openings 535 are not distinguished from each other, the description will be made using the reference numeral “535” (the same applies to the labyrinth 532). Returning to FIG. 34, the insect repellent net 533 is an insect repellent means for preventing insects from entering the detection space 534 while allowing outside air to enter the detection space 534 through the small holes of the insect repellent net 533. The labyrinth 532 is formed in an annular shape surrounding the outer circumference, and has a large number of small holes having a size that makes it difficult for insects to invade on its side surface.

(Configuration-Detector body)
Next, FIG. 45 is a bottom view of the detection unit main body, FIG. 46 is a plan view of the detection unit main body, and FIG. 47 is a front view of the detection unit main body. As shown in FIG. 33, the detection unit main body 504 in each of these drawings is an arrangement means for arranging the detection unit cover 503, and is a partition means for partitioning the detection space 534 together with the detection unit cover 503. Further, the detection unit main body 504 is a covering means for covering the circuit board 551, and the detection unit cover 503 is arranged on the opposite side of the detection unit main body 504 from the circuit board 551. Specifically, the gas flowing into the case 502 from the external inflow opening 523 is shielded from entering between the detection unit main body 504 and the front case 522, and then the gas flow path is established between the back case 521. It is what forms. For example, the detection unit main body 504 extends from the detection unit cover 503 side of FIG. 33 to the external inflow opening 523 side in the direction along the XY plane, and as shown in FIG. 35, from the ceiling plate 531 of the detection unit cover 503. Also has a large diameter and is slightly smaller than the front case 522, and has a disk shape with a part cut out, and a part of the inside is on the lower side (-Z direction). ) To the upper side (+ Z direction), and is made of resin which is integrally formed as a whole. In addition, "slightly smaller diameter than the front case 522" means that the diameter of the detection unit main body 504 means that the detection main body side end portion 5400a abuts on the front case side end portion 5222a from the inside, as shown in FIG. 33. It indicates that the "diameter" is such that (or approaches). The "detection body side end" 5400a is an outer edge of the detection body 504 and is an edge on the outside inflow opening 523 side.

More specifically, the detection unit main body 504 of FIG. 35 includes a flange portion 541, an inclined portion 542, a raised portion 543, a detection portion main body notch portion 544, a speaker housing portion 545, and an element cover 546 of FIGS. 45 to 47. To be equipped. The flange portion 541 is a portion of the detection unit main body 504 that extends in a direction along the outer XY plane, and includes a positioning recess 411. The positioning recesses 411 are positioning means for positioning the ribs 565 of the back case 521 with respect to the detection unit main body 504. Specifically, a plurality of positioning recesses 411 are provided on the outer edge portion of the flange portion 541 and are provided on the upper side. It is recessed from (+ Z side) to the lower side (-Z side). Further, the inclined portion 542 is a portion continuous from the flange portion 541, and the flange portion 541 (direction along the XY plane) is provided in order to provide the detection space 534 in FIG. 33 on the upper side (+ Z direction) of the external inflow opening 523. ), Which is inclined toward the upper side (+ Z direction). Further, the raised portion 543 is a portion where the detection portion cover 503 is provided, is located above the flange portion 541 (+ Z direction), and extends continuously from the inclined portion 542 in the direction along the XY plane. It is the part that is. The arrangement recess 5431 shown in FIG. 35 is formed on the upper surface (+ Z direction) of the raised portion 543. The arrangement recess 5431 is a portion where the detection unit cover 503 is arranged, and specifically, is a circular recess having a diameter corresponding to the outer diameter of the detection unit cover 503. Further, the detection unit main body cutout portion 544 is a portion cut out in a shape corresponding to the outer shape of the component case 5616 in order to provide the component case 5616 described later for the alarm device 5100. Further, in order to accommodate a speaker (not shown) between the detection unit main body 504 and the front case 522, the speaker accommodating portion 545 is from the lower side (−Z direction) to the upper side so as to correspond to the outer shape of the accommodating speaker. It is a part that rises toward (+ Z direction). The speaker is an output means that outputs an alarm based on the amount of reflected light received by the light receiving unit 553. The specific mode of the voice output from the speaker is arbitrary, and a synthetic voice generated as needed, a pre-recorded voice, an alarm sound, or the like can be output. Further, the element cover 546 covers the light emitting unit 552 and the light receiving unit 553 described later in the circuit unit 505 from the upper side (+ Z direction) to prevent dust from accumulating on the light emitting unit 552 and the light receiving unit 553. , Is formed integrally with the placement recess 5431 near the center of the placement recess 5431 in the raised portion 543. The details of the flange portion 541 and the speaker housing portion 545 will be described later.

(Structure-Circuit part)
Next, FIG. 48 is a bottom view of the circuit unit, FIG. 49 is a plan view of the circuit unit, and FIG. 50 is a front view of the circuit unit. The circuit unit 505 in each of these figures is a circuit means for forming an electric circuit for performing an alarm, and more specifically, a circuit board 551, a light emitting unit 552, a light receiving unit 551, a shield 554, a switch 555, and a power connector. It is equipped with CN1. The circuit board 551 is a mounting means on which each element of the alarm device 5100 is mounted, and in particular, is a board on which the light emitting unit 552 and the light receiving unit 553 are mounted. Specifically, the mounting surface on the upper side (+ Z direction). Through-holes and the through-holes at predetermined positions so that each element can be mounted on the lower mounting surface (hereinafter, lower mounting surface) or the lower (-Z direction) mounting surface (hereinafter, lower mounting surface) using solder or the like. Terminals and the like are provided so as to surround the above. Specifically, as shown in FIG. 33, the light emitting unit 552 is mounted on the upper mounting surface of the circuit board 551 so that light can be emitted toward the detection space 534 provided above the light emitting unit 552 (+ Z direction). It is an element to be used, for example, a light emitting diode. The light receiving unit 553 is a light receiving means for receiving the scattered light generated by the light emitted by the light emitting unit 552 being scattered by smoke particles, and specifically, above the light receiving unit 553 (+ Z direction). An element mounted on the upper mounting surface of the circuit board 551 so that light from the detection space 534 provided can be received, and is, for example, a photodiode. The shield 554 of FIG. 50 is a shielding means for electromagnetically shielding the light receiving portion 553, and is a supporting means for supporting the light receiving portion 553 with respect to the circuit board 551. Specifically, the circuit board 551 It is a conductive element mounted on the upper mounting surface of the above, and is formed of, for example, metal. The switch 555 of FIG. 48 is an operating means for operating the alarm device 5100, and specifically, is an element mounted on the lower mounting surface of the circuit board 551, and is, for example, a push switch. The power connector CN1 of FIG. 49 is a supply means for supplying a power supply voltage to the alarm device 5100, and specifically, is for supplying a power supply voltage from a battery (not shown) as a power source. Therefore, it is mounted on the upper mounting surface of the circuit board 551.

(Composition-Details)
Next, the configuration of the alarm device 5100 according to the fifth embodiment will be described in more detail. Specifically, the configurations of the detection unit main body 504, the circuit board 551, and the front case 522 will be described in detail.

(Structure-Details-Detector body)
First, the details of the flange portion 541, the battery holding spring 548, and the speaker accommodating portion 545 in the detection unit main body 504 will be described. FIG. 51 is an enlarged perspective view of the detection unit main body 504.

(Structure-Details-Detection body-Flange)
The flange portion 541 is a flange for promoting the inflow of gas into the detection space 534, and is a flange integrally formed with the outer edge portion of the detection portion main body 504. Specifically, as shown in FIG. 33, the flange portion 541 extends to a position where it abuts on the inner peripheral surface of the front case 522, and the flange portion 541 extends the outer edge of the detection unit main body 504 and the front case. The gap with the inner peripheral surface of 522 is sealed. As a result, it is possible to prevent smoke from entering the space between the detection unit main body 504 and the front case 522 from the external inflow opening 523 through the gap, and the amount of smoke flowing into the detection space 534. Can be increased. The thickness and material of the flange portion 541 are arbitrary, and in the fifth embodiment, the flange portion 541 is formed of the same thickness and the same material (resin) as the other portion of the detection unit main body 504.

(Configuration-Details-Detector body-Battery holding spring)
The battery holding spring 548 is a power supply urging means for urging and holding the power supply unit that supplies power to the alarm device 5100, and is a power supply urging means integrally formed with the detection unit main body 504. Specifically, as shown in the drawing, the battery holding spring 548 is provided at a predetermined interval along the edge of the detection unit main body notch 544 on the lower surface (−Z direction) of the detection unit main body 504. It is formed in two places. Here, the battery holding spring 548 has a substantially U-shape that protrudes downward (−Z direction) from the arrangement location, is bent outward (−X direction), and then projects upward (+ Z direction). The power supply unit is configured to be able to be urged from the notch portion 544 of the detection unit main body toward the outside (-X direction). The space between the base portion and the tip portion of the battery holding spring 548 will be referred to as "biased space" 549 below.

Here, as shown in FIGS. 34, 35, and 38, the component case 5616 of the back case 521 is notched in the downward direction (−Z direction) at a position corresponding to the battery holding spring 548. Two component case notches 5617 are provided. The component case notch 5617 is not provided through in the height direction (Z direction), and is notched at a height of about half that of the component case 5616. The portion of the component case 5616 above the component case notch 5617 (in the + Z direction) is hereinafter referred to as a "stopper portion" 5618.

When the back case 521 and the detection unit main body 504 are combined, the battery holding spring 548 is inserted into the component case notch 5617, and the stopper portion 5618 is interposed inside the urging space 549 of the battery holding spring 548. To do. By interposing the stopper portion 5618 inside the urging space 549 in this way, the bending of the battery holding spring 548 in the inner direction (+ X direction) is regulated by the stopper portion 5618, so that the battery holding spring is stored when the battery is stored. It is possible to prevent the 548 from being plastically deformed due to excessive bending. As described above, in the fifth embodiment, the battery holding spring 548 is not provided in the back case 521 integrally with the stopper portion 5618, but is provided in the detection unit main body 504 separated from the back case 521. Therefore, as compared with the case where the battery holding spring 548 is provided in the component case 5616 of the back case 521, the tip position (position of the end portion in the −X direction) of the battery holding spring 548 can be suppressed inward (+ X direction). The component case 5616 can be miniaturized. As described above, the component case 5616, which is a component that obstructs the airflow to the detection space 534, can be miniaturized, so that the inflow of the airflow into the detection space 534 can be increased and the detection accuracy can be improved. Further, as compared with the case where the battery holding spring 548 is formed in the case 502 by forming a component such as the battery holding spring 548 in which stress is always applied from the battery when the battery is stored in the detection unit main body 504 which cannot be visually recognized from the outside. It is possible to prevent poor appearance due to deformation based on the above stress.

(Structure-Details-Detection unit body-Speaker storage unit)
The speaker storage unit 545 is a storage means for storing a speaker that outputs an alarm, and is a storage means integrally formed with the detection unit main body 504. The speaker accommodating portion 545 is a plate-shaped member formed at a position corresponding to the speaker in the detection unit main body 504 and projecting downward (−Z direction), and is a circle having an inner diameter slightly larger than the outer shape of the speaker. It is an annular member. Here, "slightly large" is arbitrary as long as it is at least large enough to accommodate the speaker, and for example, a gap of several millimeters is formed between the outer circumference of the speaker and the inner circumference of the speaker accommodating portion 545. It doesn't matter how big it is. Here, as shown in FIG. 50, a plurality of speaker holes are formed at the position where the speaker accommodating portion 545 is formed in the detection unit main body 504, and the alarm sound emitted from the speaker is transmitted through the speaker holes. It also flows upward (+ Z direction).

(Structure-Details-Placement recess)
Next, the details around the arrangement recess 5431 in the detection unit main body 504 will be described. 52 is a cross-sectional view taken along the line BB of FIG. 32, and FIG. 53 is a cross-sectional view taken along the line CC of FIG. 52. As shown in FIGS. 52 and 53 and FIGS. 45 to 47 described above, the upper surface (+ Z side surface) of the detection unit main body 504 is roughly represented by a light emitting recess 5432 and a light receiving recess 5433. A groove portion 5434 and an outer edge wall 5435 are provided, and as shown in FIG. 51 described above, a lower surface of the detection unit main body 504 (a surface on the side facing the circuit board 551; a surface on the −Z side). Is provided with a light-shielding frame portion 5438. In FIG. 53, the optical axis of the light emitting unit 552 is shown by a long-dashed line, and the optical axis of the light receiving unit 553 is shown by a long-dashed line.

(Structure-Details-Arrangement recess-Light emitting recess)
The light emitting recess portion 5432 is a detection accuracy reduction suppressing means for suppressing a deterioration in detection accuracy due to the position of dust on the optical axis of the light emitting unit 552. Specifically, the light emitting recess 5432 is a recess integrally formed with the arranged recess 5431 at a position closer to the light emitting portion 552 than the center of the arranged recess 5431, and the specific shape is arbitrary. In the fifth embodiment, as shown in FIG. 53, the outermost surface is a slope, which is a cross-sectional view trap-shaped depression.

Here, a light emitting hole 5436 penetrating the detection unit main body 504 is formed on the slope portion. The light emitting hole 5436 is a hole for introducing light from the light emitting unit 552 into the detection space 534 through the detection unit main body 504. Specifically, it is a hole provided on the optical axis of the light emitting portion 552 in the light emitting recessed portion 5432, and is formed so as to penetrate the slope of the light emitting recessed portion 5432. The size and shape of the diameter of the light emitting hole 5436 are arbitrary as long as the light of the light emitting unit 552 can be introduced into the detection space 534, and experiments and analyzes are performed based on, for example, the projection angle and the amount of light of the light emitting unit 552. The appropriate size and shape can be determined by such means.

Returning to the description of the light emitting recess 5432, by providing the light emitting recess 5432 in this way and recessing the position inside the light emitting hole 5436 (on the right side in FIG. 53), dust is generated on the bottom surface of the light emitting recess 5432. Even if some dust is accumulated, the dust is not located on the optical axis until the accumulated dust reaches the height of the light emitting hole 5436. Therefore, it is possible to suppress a decrease in detection accuracy due to the position of dust on the optical axis of the light emitting unit 552. Here, it is preferable that the depth of the light emitting recessed portion 5432 is deeper in order to prevent a decrease in detection accuracy due to accumulation of dust. That is, if the light emitting recess 5432 is shallow, only a small amount of dust accumulates on the bottom surface of the light emitting recess 5432, and the dust is located on the optical axis of the light emitting portion 552, and the light is reflected by the dust. There is a possibility that smoke will be erroneously detected, but such a situation can be prevented by deepening the light emitting recess 5432 so that a large amount of dust can be accumulated. However, if it is too deep, the thickness of the entire detection unit main body 504 becomes large, which in turn increases the size of the entire alarm device 5100, which is not preferable. In the fifth embodiment, a depression having a depth of about 3 mm is provided.

(Structure-Details-Arrangement recess-Light receiving recess)
The light receiving recess portion 5433 is a detection accuracy reduction suppressing means for suppressing a deterioration in detection accuracy due to the position of dust on the optical axis of the light receiving portion 553. Specifically, the light receiving recess 5433 is a recess integrally formed with the arranged recess 5431 at a position closer to the light receiving portion 553 than the center of the arranged recess 5431, and the specific shape is arbitrary. In the fifth embodiment, as shown in FIG. 50, the outermost surface is a slope, which is a cross-sectional view trap-shaped depression.

Here, a light receiving hole 5437 is formed in the slope portion. The light receiving hole 5437 is a hole for introducing light from the detection space 534 through the detection unit main body 504 and into the light receiving unit 553. Specifically, it is a hole provided on the optical axis of the light receiving portion 553 in the light receiving recess 5433, and is formed so as to penetrate the slope of the light receiving recess 5433. The size and shape of the diameter of the light receiving hole 5437 are arbitrary as long as light can be introduced into the light receiving portion 553. For example, a lens portion provided on the surface of the light receiving portion 553 on the detection space 534 side and having a light collecting function. It may be formed in the same size and shape as (reference notation omitted).

Returning to the explanation of the light receiving recess 5433, by providing the light receiving recess 5433 in this way and denting the position inside the light receiving hole 5437 (left side in FIG. 53), dust is generated on the bottom surface of the light receiving recess 5433. Even if some dust is accumulated, the dust is not located on the optical axis until the accumulated dust reaches the height of the light receiving hole 5437. Therefore, it is possible to suppress a decrease in detection accuracy due to the position of dust on the optical axis of the light receiving unit 553. Here, it is preferable that the depth of the light receiving recess 5433 is deeper in order to prevent the detection accuracy from being lowered due to the accumulation of dust, as in the case of the light emitting recess 5432 described above. In the fifth embodiment, a depression having a depth of about 3 mm is provided.

(Structure-Details-Placement recess-Groove)
The groove portion 5434 is a groove portion 5434 formed around the light emitting hole 5436 and the light receiving hole 5437 on the surface of the detection unit main body 504 facing the detection space 534, and is a groove recessed toward the side opposite to the detection space 534. is there. Specifically, the groove portion 5434 is a groove formed integrally with the arrangement recess 5431 so as to cover the periphery of the light emitting recess 5432 and the light receiving recess 5433, and is more than the arrangement recess 5431. This is a portion that is one step lower toward the opposite side (that is, the lower side) of the detection space 534. By providing the groove portion 5434 which is one step lower in the arrangement recess 5431 in this way, the dust that has entered the detection space 534 accumulates in the groove portion 5434, so that the dust is highly accumulated on the surface of the element cover 546. Can be prevented. Therefore, it is possible to prevent a situation in which the detection accuracy is lowered because the accumulated dust is located on the optical axis of the light emitting unit 552 and the light receiving unit 553. The depth of the groove 5434 is arbitrary, but may be, for example, about 1 mm to 2 mm.

(Structure-Details-Placement recess-Outer edge wall)
The outer edge wall 5435 is a wall portion raised from the detection unit main body 504 toward the detection space 534 side around the light emitting recess 5432 and the light receiving recess 5433 on the surface of the detection unit main body 504 on the detection space 534 side. .. Specifically, the outer edge wall 5435 is a resin wall provided on the surface of the groove portion 5434, and is along the outer edge of the light emitting recess 5432 and the light receiving recess 5433 on the mounting surface side (that is, the upper surface side). It is a formed wall. The thickness of the outer edge wall 5435 is arbitrary as long as sufficient strength can be maintained, but in the fifth embodiment, a plate-like body having a thickness of about 1 mm is exhibited. Further, the height of the outer edge wall 5435 is arbitrary as long as it does not interfere with the optical axis. For example, in the fifth embodiment, the height is formed to be a uniform height of about 1.5 mm, but the height is not limited to this. It may be formed.

By providing the outer edge wall 5435 in this way, as shown in FIG. 53, the outer edge wall 5435 is located between the light emitting portion 552 and the light receiving portion 553, so that the light is received directly by the light receiving portion 553 without passing through the detection space 534. It is possible to prevent erroneous detection. Further, the outer edge wall 5435 can prevent dust accumulated in the groove portion 5434 from falling to the light emitting portion 552 and the light receiving portion 553 via the light emitting portion 5436 and the light receiving hole 5437, and the light emitting portion 552 and the light receiving portion 553 can be prevented from falling. It is possible to prevent a decrease in detection accuracy due to the accumulation of dust on the surface of the surface. Further, it is possible to prevent the dust accumulated in the groove 5434 from falling from the groove 5434 to the bottom surface of the light emitting recess 5432 and the bottom surface of the light receiving recess 5433 and accumulating, and it is possible to prevent the dust from falling and accumulating. It is possible to prevent a decrease in detection accuracy due to the dust accumulated on the bottom surface of the light emitting unit 552 and the light receiving unit 553 being located on the optical axis.

(Structure-Details-Arrangement recess-Shading frame part)
The light-shielding frame portion 5438 is a light-shielding means formed around the light-emitting hole 5436 or the light-receiving hole 5437 on the surface of the detection unit main body 504 facing the circuit board 551, and is arranged so as to be raised toward the substrate. , A light-shielding means that covers the periphery of the light-emitting unit 552 and the light-receiving unit 553. Specifically, the light-shielding frame portion 5438 is a frame-like body having a lower surface as an open surface, and is formed so as to project downward from the lower surface (the surface in the −Z direction) of the detection unit main body 504. When the detection unit main body 504 and the circuit board 551 are combined, the light emitting unit 552 and the light receiving unit 553 attached to the circuit board 551 are housed inside the light shielding frame unit 5438, and the light emitting unit 552 and the light receiving unit 552 receive light. It is arranged so as to cover the front, back, left and right of the portion 553.

In this way, by covering the light emitting unit 552 and the light receiving unit 553 with the light shielding frame unit 5438, the light emitting unit 552 detects the light emitting unit 553 without passing through the detection space 534 (that is, wrapping around the lower part of the detection unit main body 504). It is possible to prevent the light from reaching and allow the light to pass through the correct route (the route through which the light from the light emitting unit 552 reaches the light receiving unit 553 via the light emitting hole 5436, the detection space 534, and the light receiving hole 5437). False detection can be prevented. In the fifth embodiment, the light-shielding frame portion 5438 has a shape that covers both the light-emitting portion 552 and the light-receiving portion 553, but the shape is not limited to this, and a shape that covers only one of them may be used.

(Configuration-Details-Circuit board)
Subsequently, the details of the circuit board 551 will be described. FIG. 54 is a perspective view of the circuit board 551. As shown in FIG. 54, the circuit board 551 generally includes a light emitting unit 552, a light receiving unit 553, a shield 554, and a substrate hole 556.

First, the light emitting unit 552 is a light emitting means (light emitting side detecting means) that emits light to the detection space 534, and is a light emitting means that emits light in a direction toward the mounting surface of the alarm device 5100, and is known. It is formed as a light emitting diode, and the optical axis at a predetermined angle is determined by mounting the two connecting wires (feet) on the circuit board 551 in a state of being bent at a predetermined angle.

Further, the light receiving unit 553 is a light receiving means for receiving the reflected light of the light projected from the light emitting unit 552 into the detection space 534, and whether or not the substance to be detected is contained based on the amount of the received light. It is a light receiving means (light receiving side detecting means) for detecting the light intensity, is formed as a known photodiode, and is integrally formed with the shield 554.

Further, the shield 554 is a noise prevention means for preventing noise to the light receiving portion 553, and the light of the light receiving portion 553 is formed by being integrally formed with the light receiving portion 553 so that the light receiving portion 553 faces a predetermined direction. It is a noise prevention means for fixing the axis. Specifically, the shield 554 is arranged on the upper surface (+ Z direction) of the circuit board 551 so as to face the light emitting portion 552, and the bottom surface of the shield 554 is parallel to the circuit board 551 and is a shield. The surface of the 554 on the side facing the light emitting portion 552 is an inclined surface (the surface on which the light receiving portion 553 is mounted) inclined by a predetermined angle from the vertical direction, and the bottom surface and the inclined surface form an acute angle. That is, when the shield 554 is mounted on the circuit board 551, the optical axis of the light receiving unit 553 is determined by the shape of the shield 554.

Further, the substrate hole 556 is a hole provided at a position corresponding to the bent portion of the light emitting portion 552, and an optical axis adjusting pin 5701 for determining the mounting angle of the light emitting portion 552 with respect to the circuit board 551 is inserted. It is a possible hole. Specifically, the substrate hole 556 is a hole formed on the light receiving portion 553 side from the attachment position of the connecting line of the light emitting portion 552, and the shape and diameter of this hole are as long as the optical axis adjusting pin 5701 can be inserted. Although it is optional, in the fifth embodiment, it is a circular hole having a diameter of about 5 mm. Here, the "optical axis adjusting pin" 5701 is an angle determining instrument used when determining the mounting angle of the light emitting unit 552 with respect to the circuit board 551, and is a concept including, for example, an arbitrary rod-shaped jig. Since the surface of the light emitting portion 552 facing the substrate hole 556 is a curved surface, the tip of the optical axis adjusting pin 5701 should be a concave surface having a shape corresponding to the curved surface so as to easily hold the light emitting portion 552. Is preferable.

(Structure-Details-Table case)
Next, the details of the table case 522 will be described. Here, on the upper surface (the surface on the + Z direction side) of the front case 522, an obstruction projection 5226 (see FIGS. 35 and 41) projecting upward (in the + Z direction) is formed. The blocking projection 5226 is a closing means for closing the substrate hole 556 while accommodating the light emitting portion 552, the light receiving portion 553, and the detecting portion main body 504, and is a supporting means capable of supporting the light emitting portion 552. Specifically, the blocking projection 5226 is provided at a position corresponding to the substrate hole 556 of the circuit board 551 in the front case 522 (a position directly below the substrate hole 556 (-Z direction)), and the substrate hole 556 It is a protrusion having a diameter that can be inserted into the protrusion. Here, "insertable" means having an outer diameter smaller than the inner diameter of the substrate hole 556, but it is preferable that the outer diameter is closer to the inner diameter of the substrate hole 556. By closing the substrate hole 556 with the blocking projection 5226 in this way, it is possible to prevent the light of the light emitting portion 552 from wrapping around to the lower side (-Z direction) of the circuit board 551 through the substrate hole 556, and the light receiving portion. It is possible to reduce the possibility that the 553 receives the wraparound light and erroneously detects the generation of smoke. Further, when visible light is used as the light of the light emitting unit 552, it is possible to prevent an appearance defect due to the visible light being transferred to the front case 522 through the substrate hole 556.

Here, the height of the obstruction projection 5226 (length in the Z direction) is at least a length such that the tip of the obstruction projection 5226 is inserted into the substrate hole 556 when the circuit board 551 is installed in the front case 522. It is arbitrary as long as it has, but it is more preferable that the length is such that the light emitting portion 552 can be supported. "Available to support the light emitting unit 552" means that by supporting the light emitting unit 552, it is possible to prevent the connection line of the light emitting unit 552 from being bent when an impact or the like is applied to the light emitting unit 552. For example, since the tip of the obstruction projection 5226 interferes with the light emitting portion 552, the light emitting portion 552 is fixedly supported, and the tip of the obstruction projection 5226 does not interfere with the light emitting portion 552, so that the light emitting portion 552 By being located slightly downward (−Z direction), it includes preventing bending beyond the permissible range of the light emitting unit 552. The tip shape of the closing protrusion 5226 is arbitrary, and may have a concave shape corresponding to the curved surface shape so as to easily support the light emitting portion 552 which is a curved surface shape, for example.

(Mounting method for circuit board)
Subsequently, a mounting method for mounting the light emitting unit 552, the light receiving unit 553, and the shield 554 on the circuit board 551 will be described in the fifth embodiment.

First, the configuration of the mounting jig 5700 used in the mounting method will be briefly described. FIG. 55 is a cross-sectional view showing a circuit board 551 and a mounting jig 5700. As shown in FIG. 55, the mounting jig 5700 includes a base 5710 and an upper lid 5720, and is configured so that a circuit board 551 can be interposed between the base 5710 and the upper lid 5720.

First, the configuration of the base 5710 will be described. The base 5710 includes a light emitting portion pocket 5711 and a light receiving portion pocket 5712.

The light emitting unit pocket 5711 is a recess having a size and shape capable of accommodating the light emitting unit 552, and in a state where the light emitting unit 552 is housed in the light emitting unit pocket 5711, the positional relationship between the light emitting unit 552 and the circuit board 551 is determined. This is the positional relationship when the light emitting unit 552 is finally mounted on the circuit board 551. Here, the bottom surface (+ Z direction end surface) of the light emitting portion pocket 5711 exhibits a slope shape at an angle corresponding to the bending angle of the connecting line of the light emitting portion 552 (an angle parallel to the optical axis of the light emitting portion 552). .. The reason for having such a slope shape will be described later.

Further, the light receiving portion pocket 5712 is a recess having a size and shape capable of accommodating the shield 554 integrally formed with the light receiving portion 553, and the light receiving portion 553 (and the shield 554) is accommodated in the light receiving portion pocket 5712. The positional relationship between the light receiving unit 553 and the circuit board 551 is the positional relationship when the light receiving unit 553 is finally mounted on the circuit board 551. Here, the bottom surface (end surface in the + Z direction) of the light receiving portion pocket 5712 exhibits a slope shape having an angle corresponding to the inclination angle of the shield 554. The reason for having such a slope shape will be described later.

Here, in a state where the light receiving portion 553 is housed in the light receiving portion pocket 5712, the light receiving portion 553 is pressed against the circuit board 551. Specifically, the base 5710 is provided with an urging hole 5716, and a slide member 5713 is slidably stored inside the urging hole 5716, and the light receiving portion pocket 5712 is the slide member. It is formed at the end in the −Z direction of 5713. A spring 5714 is arranged on the bottom surface (+ Z direction end face) of the basting hole 5716, and the slide member 5713 is urged in the direction toward the circuit board 551 (-Z direction), thereby receiving light. The light receiving portion 553 housed in the portion pocket 5712 is pressed against the circuit board 551. The specific method of pressing the light receiving portion 553 against the circuit board 551 is not limited to this, and for example, an elastic member such as rubber may be applied instead of the spring 5714 described above.

Next, the configuration of the upper lid 5720 will be described. The upper lid 5720 is rotatably attached to the base 5710 with one end as a base point as a whole. A planar exposed hole 5721 slightly smaller than the circuit board 551 is provided in the central portion of the upper lid 5720 in a plan view. When the upper lid 5720 is closed, the circuit board is provided through the exposed hole 5721. The vicinity of the center of the 551 (the portion including the light emitting portion pocket 5711 and the light receiving portion pocket 5712 described above) is exposed to the outside (see FIG. 59 and the like described later), and the outer edge portion of the circuit board 551 is suppressed and fixed by the upper lid 5720. ..

The mounting method using the mounting jig 5700 as described above will be described below. FIG. 56 is a perspective view showing the mounting jig 5700 in the initial state. In this state, the upper lid 5720 is in the open state. FIG. 57 is a perspective view showing a mounting jig 5700 in a state where the light emitting unit 552, the light receiving unit 553, and the shield 554 are arranged on the mounting jig 5700. As described above, first, the light emitting portion 552 is housed inside the light emitting portion pocket 5711, and the shield 554 (the shield 554 in which the light receiving portion 553 is integrally formed) is housed inside the light receiving portion pocket 5712. Here, the light emitting unit 552 is housed in a state where the connecting line of the light emitting unit 552 is bent at a predetermined angle by using another known jig (forming jig or the like) in advance. As described above, the bottom surface (+ Z direction end face) of the light emitting portion pocket 5711 has a slanted shape, and when the light emitting portion 552 is accommodated, the light emitting portion 552 is arranged so as to form a predetermined angle. Since the angle of the slope of the bottom surface (end surface in the + Z direction) corresponds to the bending angle of the connecting line, the connecting line of the light emitting unit 552 is arranged along the vertical direction in the state where the light emitting unit 552 is housed. Further, the + Z direction end of the shield 554 has a slope shape as described above, and the bottom surface (+ Z direction end face) of the light receiving portion pocket 5712 also has a slope shape corresponding to this shape, so that the shield 554 is accommodated. When this is done, the end face (end face in the −Z direction) of the shield 554 on the circuit board 551 side becomes horizontal along the circuit board 551.

Subsequently, the circuit board 551 is placed on the base 5710 of the mounting jig 5700 (the light emitting unit 552 and the light receiving unit 553 that detect whether or not the gas flowing into the detection space 534 contains the substance to be detected are placed. Mounting step of mounting the element on a circuit board 551 on which the element can be mounted at a predetermined angle). FIG. 58 is a perspective view showing a mounting jig 5700 in a state where the circuit board 551 is mounted. Here, the mounting jig 5700 is formed with a positioning protrusion 5715, and the circuit board 551 is placed so that the positioning protrusion 5715 penetrates the positioning hole 557 formed in the circuit board 551. Therefore, the position of the circuit board 551 with respect to the base 5710 can be uniquely determined. At this time, the connection lines of the light emitting unit 552, the shield 554, and the light receiving unit 553 are inserted into each through hole provided in the circuit board 551.

Subsequently, the circuit board 551 is fixed by closing the upper lid 5720. FIG. 59 is a perspective view showing a mounting jig 5700 with the upper lid 5720 closed. In order to prevent the circuit board 551 from moving further, the upper lid 5720 may be held down by a known pin or the like.

Finally, in the state shown in FIG. 59, the light emitting unit 552, the light receiving unit 553, and the shield 554 are electrically mounted on the circuit board 551 (the light emitting unit 552 and the light receiving unit 553 attached to the circuit board 551 in the mounting process). Is electrically mounted on the circuit board 551 while maintaining a predetermined angle (angle at the time of mounting)). As shown in the drawing, a part of the circuit board 551 is exposed by the exposed hole 5721 of the upper lid 5720, so that the circuit board 551 can be directly soldered even when the upper lid 5720 is closed. Specifically, first, the optical axis adjusting pin 5701 (see FIG. 55) was inserted into the substrate hole 556 provided in the circuit board 551, and the light emitting portion 552 was pressed and fixed to the + Z direction end face of the light emitting portion pocket 5711. In this state, the connecting wire of the light emitting portion 552 protruding from the through hole of the circuit board 551 is soldered to the circuit board 551 for mounting. In this way, the light emitting portion 552 is held diagonally inside the light emitting portion pocket 5711 by the force pressed by the optical axis adjusting pin 5701, so that the installation position and the angle are uniquely determined. Subsequently, the connecting wire of the light receiving portion 553 protruding from the through hole of the circuit board 551 is soldered to the circuit board 551 for mounting. The installation position and angle of the light receiving unit 553 are uniquely determined by being suppressed by the urging force in the −Z direction with respect to the circuit board 551 as described above.

This completes the description of the mounting method for mounting the light emitting unit 552, the light receiving unit 553, and the shield 554 on the circuit board 551. Then, the detection unit main body 504 interposed between the circuit board 551 and the detection space 534 is installed (covered) so as to cover the circuit board 551 and the light emitting unit 552 and the light receiving unit 553 mounted on the circuit board 551. The alarm device 5100 can be manufactured by accommodating each component between the means installation process (see FIG. 35, etc.) and the case 502.

(Effect of Embodiment 5)
As described above, according to the fifth embodiment, since the detection unit main body 504 does not interfere with the circuit board 551, the light emitting unit 552, and the light receiving unit 553, the light emitting unit 552 and the light receiving unit 553 are set in the detection unit main body 504. After that, the work of covering the detection unit main body 504 with the circuit board 551 and simultaneously inserting the connection lines of the light emitting unit 552 and the light receiving unit 553 into the through hole of the circuit board 551 can be omitted, and the light emitting unit 552 and the light receiving unit 553 are mounted. The work can be simplified, and it is not necessary to provide the detection unit main body 504 with a mechanism for attaching the light emitting unit 552 and the light receiving unit 553, and the mechanism of the detection unit main body 504 is simplified to improve the productivity of the alarm device 5100. It becomes possible to improve.

Further, since the detection means includes the light receiving unit 553 and the shield 554 is integrally formed with the light receiving unit 553, the mounting work of the light receiving unit 553 and the shield 554 can be simplified, and the light receiving unit 504 is mounted on the light receiving unit main body 504. It is no longer necessary to provide the detection unit main body 504 with a mechanism for attaching the 553 and the shield 554, and the mechanism of the detection unit main body 504 can be simplified to improve the productivity of the alarm device 5100.

Further, since the outer edge portion of the detection unit main body 504 is provided with the flange portion 541 for promoting the inflow of gas into the detection space 534, the amount of gas inflow into the detection space 534 can be increased and the detection accuracy can be improved. It will be possible.

Further, since the battery holding spring 548 on which the stress from the power supply unit always acts is integrally formed with the detection unit main body 504 which cannot be visually recognized from the outside, it is compared with the case where the battery holding spring 548 is provided in a mechanism which can be visually recognized from the outside such as the case 502. Therefore, the deformation due to the stress becomes inconspicuous, and the appearance defect can be prevented.

Further, since the speaker accommodating portion 545 for accommodating the speaker connected to the circuit board 551 is integrally formed with the detection unit main body 504, the output means can be arranged on the same surface side as the circuit board 551 in the detection unit main body 504, and the speaker can be arranged. It is possible to simplify the connection to the circuit board 551 and improve the productivity of the alarm device 5100.

Further, since the circuit board 551 is provided with a substrate hole 556 through which the optical axis adjusting pin 5701 can be inserted, the mounting angle of the light emitting unit 552 can be adjusted by an extremely easy method of inserting the optical axis adjusting pin 5701 to suppress the light emitting unit 552. It can be easily determined, and the productivity of the alarm device 5100 can be improved.

Further, since the case 502 is provided with a closing projection 5226 that closes the substrate hole 556, it is possible to prevent erroneous detection due to the light of the light emitting portion 552 wrapping around from the substrate hole 556 and being received by the light receiving portion 553. It is possible to improve the detection accuracy.

Further, since the blocking projection 5226 can support the light emitting portion 552, the angle of the light emitting portion 552 changes when an external force is applied to the light emitting portion 552 for some reason, and the detection accuracy deteriorates. It becomes possible to prevent.

Further, since the detection unit main body 504 includes a light emitting hole 5436 and a light receiving hole 5437, the detection unit main body 504 covers the circuit board 551 to suppress the accumulation of dust on the circuit board 551, and the light emitting hole 5436 and the light receiving hole 5436 and the light receiving hole. The 5437 can be configured so as not to obstruct the optical axes of the light emitting unit 552 and the light receiving unit 553.

Further, since the groove portion 5434 recessed toward the side opposite to the detection space 534 is provided around the light emitting hole 5436 and the light receiving hole 5437, the dust is raised above the detection unit main body 504 by accumulating the dust in the groove portion 5434. It is possible to prevent the dust from accumulating, and the dust accumulated around the light emitting hole 5436 or the light receiving hole 5437 in the detection unit main body 504 is located on the light emitting shaft or the light receiving shaft, so that the detection accuracy is lowered. Can be prevented.

Further, since the light emitting frame portion 435 is provided so as to be raised around the light emitting hole 5436 or the light receiving hole 5437 and covers the periphery of the light emitting unit 552 or the light receiving unit 553, the light from the light emitting unit 552 is detected in the detection space 534. It is possible to prevent erroneous detection due to being directly received by the light receiving unit 553 without passing through the detection unit main body 504, and dust accumulated in the detection unit main body 504 is transmitted from the detection unit main body 504 through the light emitting unit 5436 and the light receiving hole 5437. It is possible to prevent a situation in which the detection accuracy is lowered by falling on the 552 or the light receiving unit 553 and accumulating on the surface of the light emitting unit 552 or the light receiving unit 553.

Further, since the light emitting unit 552 and the light receiving unit 553 are attached to the circuit board 551 and electrically mounted, and then the detection unit main body 504 is installed, the light emitting unit 552 and the light receiving unit 553 are set on the detection unit main body 504. It is possible to omit the work of covering the detection unit main body 504 with the circuit board 551 and simultaneously inserting the connection lines of the light emitting unit 552 and the light receiving unit 553 into the through holes of the circuit board 551, and mounting the light emitting unit 552 and the light receiving unit 553. It is not necessary to provide a mechanism for attaching the light emitting unit 552 and the light receiving unit 553 on the detection unit main body 504, and the mechanism of the detection unit main body 504 is simplified to improve the productivity of the alarm device 5100. It becomes possible to do.

(Modified example with respect to the fifth embodiment)
Although the fifth embodiment of the present invention has been described above, the specific configuration and means of the present invention may be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can be done. Hereinafter, such a modification will be described.

(About the problem to be solved and the effect of the invention)
First, the problem to be solved by the invention and the effect of the invention are not limited to the above-mentioned contents, and may differ depending on the implementation environment and the details of the configuration of the invention, and only a part of the above-mentioned problems. Or may produce only some of the effects described above.

(About distribution and integration)
Further, the above-described configuration is a functional concept, and does not necessarily have to be physically configured as shown in the figure. That is, the specific form of dispersion or integration of each part is not limited to the one shown in the drawing, and all or a part thereof can be functionally or physically dispersed or integrated in any unit. For example, the case 502 of the alarm device 5100 and the mounting base 501 may be integrally configured so that the integrally configured one can be directly mounted on the installation surface of the monitoring area.

(About the optical axis adjustment pin)
In the fifth embodiment, the optical axis adjusting pin 5701 is inserted through the substrate hole 556 to fix the light emitting portion 552, and the optical axis adjusting pin 5701 is removed after soldering in the fixed state. However, the optical axis adjusting pin 5701 may be adhered to the circuit board 551 by a known method.

(About mounting jig)
In the fifth embodiment, the mounting jig 5700 has a structure in which the upper lid 5720 is rotatably attached to the base 5710 and the circuit board 551 is sandwiched between the base 5710 and the upper lid 5720, but the circuit board 551 can be fixed. However, the upper lid 5720 may be omitted, and a member (for example, a hook) capable of fixing the circuit board 551 to the base 5710 may be provided, or the circuit board 551 may be provided with the base 5710. It may be fixed with screws, bolts or the like, or the circuit board 551 may be fitted into the base 5710 and fixed.

[Additional Notes]
The device mounting structure described in Appendix 1 is a device mounting structure in which the device body is mounted to the installation surface by a mounting plate, and the mounting plate has a screw hole portion through which a screw for fixing to the installation surface is inserted. Around the screw hole portion, a rising portion having a height equal to or higher than the head of the screw is formed.
The device mounting structure described in Appendix 2 is the device mounting structure described in Appendix 1, wherein the mounting plate has a device fixing surface portion for fixing the device body, and the device body is locked to the device fixing surface portion. It is characterized in that the locking piece portion and the screw hole portion are formed, and the rising portion is formed so as to rise from the device fixing surface portion.
The device mounting structure according to Appendix 3 is the device mounting structure according to Appendix 1 or 2, wherein the device main body has a battery storage portion for storing a battery, and the battery storage portion opens toward the mounting plate. The screw hole portion is formed at a position facing the battery housing portion.
The device mounting structure according to Appendix 4 is the device mounting structure according to any one of Supplements 1 to 3, wherein the device main body is a fire alarm that detects the occurrence of a fire and issues an alarm.
The mounting plate according to Appendix 5 is a mounting plate for mounting the device main body to the installation surface, and the mounting plate has a screw hole portion through which a screw for fixing to the installation surface is inserted. A rising portion having a height equal to or higher than the head of the screw is formed around the hole portion.
The mounting plate according to Appendix 6 is the mounting plate according to Appendix 5, wherein the mounting plate has a device fixing surface portion for fixing the device main body, and the device fixing surface portion is locked to lock the device main body. It is characterized in that one portion and the screw hole portion are formed, and the rising portion is formed so as to rise from the device fixing surface portion.
The alarm device according to Appendix 7 is an alarm device having a speaker that emits sound from the front in a housing, and the housing has a substrate portion having a speaker fixing portion for arranging and fixing the speaker inside, and the housing. An acoustic hole is formed in the front portion of the speaker at a position facing the front surface of the speaker, and the speaker fixing portion is locked to a base surface portion facing the back surface portion of the speaker and a peripheral portion of the speaker. The base surface portion has one or a plurality of penetrating portions.
In the alarm device according to the appendix 8, the substrate portion is housed in the hollow inside of the housing, and a space portion is formed between the substrate portion and the rear surface portion of the housing. At the same time, the space portion is characterized in that at least the rear surface portion side of the housing is closed.
The alarm device according to the appendix 9 is the alarm device according to the appendix 7 or 8, wherein the locking portion is composed of a plurality of locking pieces provided along the circumferential direction of the speaker formed in a substantially circular shape. It is a feature.
The alarm device according to the appendix 10 is the alarm device according to the appendix 7 or 8, wherein the locking portion is composed of a pair of locking pieces facing each other in the diameter direction of the speaker formed in a substantially circular shape. It is a feature.
The alarm according to Appendix 11 is the alarm according to Appendix 9 or 10, wherein the locking piece portion is elastically movable with respect to the fixed locking piece portion fixed to the substrate portion and the substrate portion. It is characterized by being composed of a movable locking piece.
The alarm device according to Appendix 12 is the alarm device according to Appendix 11, wherein the moving locking piece portion is formed of an elastic piece that is cantileveredly supported on the base surface portion.
The alarm device according to Supplementary Note 13 is the alarm device according to any one of Supplementary note 7 to 12, wherein the penetration portion is composed of a plurality of small holes formed in the base surface portion.
The alarm device according to Appendix 14 is the alarm device according to Appendix 11, wherein the moving locking piece portion is elastically deformable by two slit portions extending from one end portion of the base surface portion to a position at least beyond the center of the base surface portion. It is characterized in that it is formed in the elastic piece, and the slit portion serves as the penetrating portion.
The alarm device according to the appendix 15 is the alarm device according to the appendix 11, wherein the moving locking piece portion is formed in an island-shaped portion connected to the substrate portion by a small-diameter bridge portion. The gap between the island-shaped portion and the base surface portion is the penetrating portion.
The alarm device according to Appendix 16 is an alarm device having a housing and an operation button provided on the housing and capable of pressing and returning operations. The operation button has a rotating shaft portion on an outer peripheral portion thereof. The housing has an opening for accommodating the operation button, and has a bearing portion for holding the rotation shaft portion at the edge of the opening, and the operation button returns the operation button to the housing. It is characterized by having a locking portion that is locked in a state of being urged in the operating direction.
The alarm device according to the appendix 17 is the alarm device according to the appendix 16, wherein the operation button is provided with the rotating shaft portion in the vicinity of one end portion and is long from one end portion to the other end portion where the rotating shaft portion is provided. It is characterized by having a shape.
The alarm according to the appendix 18 is the alarm according to the appendix 16 or 17, wherein the operation button extends outward from an operation unit exposed from the opening and one end of the operation unit. It is characterized in that it has a portion and the rotating shaft portion is provided on the outward extending portion.
The alarm device according to the appendix 19 is the alarm device according to the appendix 18, in which the operation button is extended from one end of the operation unit in the same direction as the outward extension portion and is in line with the outer extension portion. It has an elastic piece to be provided, and the locking portion is formed at the tip end portion of the elastic piece.
The alarm device according to the appendix 20 is the alarm device according to any one of the appendices 16 to 19, wherein the operation button has a rear extension portion extending rearward, and the rear extension portion is pulled. It has a slit portion through which a string is inserted, and the slit portion is characterized in that it can be deformed in a direction in which the width increases.
The fire alarm according to Appendix 21 is a fire alarm having a smoke detection unit in a housing, and the smoke detection unit is provided with a smoke detection unit cover so as to surround a smoke detection area in which the sensor unit is arranged. The smoke detection portion cover has a plurality of light-shielding wall portions along the circumferential direction, the light-shielding wall portion has a single plate shape, and the inside and outside of the smoke detection region are communicated between the adjacent light-shielding wall portions. A gap is formed, and the light-shielding wall portions are arranged so as to overlap each other in the radial direction so that any of the light-shielding wall portions is located on the radiation centered on the detection position of the sensor portion. It is characterized by that.
The fire alarm according to the appendix 22 is the fire alarm according to the appendix 21 so that the light-shielding wall portion is inclined in the radial direction from the base of the smoke detection portion cover along the circumferential direction of the smoke detection region. It is characterized by being placed and erected in.
The fire alarm according to Appendix 23 is the fire alarm according to Appendix 21 or 22, wherein the light-shielding wall portion has an arc-shaped surface portion forming an outer peripheral surface of the smoke detection region.
The fire alarm according to Appendix 24 is the fire alarm according to any one of Supplements 21 to 23, wherein a light emitting portion is arranged in the smoke detection region, and at least from the light emitting portion of the light shielding wall portion. The surface that receives light is characterized in that an uneven shape is formed.
The alarm device according to Appendix 25 is a substrate on which an element can be mounted and a detection means electrically mounted on the substrate, and whether or not the gas flowing into the detection space contains a substance to be detected. The detection means for detecting the gas and the covering means arranged so as to cover the substrate and the detection means without interfering with the detection means, and are interposed between the substrate and the detection space. It is provided with a covering means.
The alarm device according to Appendix 26 is the alarm device according to Appendix 25, wherein the detection means includes a light receiving means for detecting whether or not a substance to be detected is contained based on the amount of light received. The alarm device is a noise preventing means for preventing noise to the light receiving means, and is formed by being fixed to the light receiving means so that the light receiving means faces a predetermined direction, so that the optical axis of the light receiving means can be set. Provide a definite noise prevention means.
The alarm device according to the appendix 27 is a flange for promoting the inflow of the gas into the detection space in the alarm device according to the appendix 25 or 26, and is integrally formed on the outer edge portion of the covering means. Equipped with a flange.
The alarm device according to Appendix 28 is a power supply urging means for urging and holding a power supply unit that supplies power to the alarm device in the alarm device according to any one of Appendix 25 to 27. The power supply urging means integrally formed with the covering means is provided.
The alarm device according to the appendix 29 is a storage means for accommodating an output means for outputting an alarm in the alarm device according to any one of the appendices 25 to 28, and is a storage means integrally formed with the covering means. To be equipped.
The alarm device according to the appendix 30 is the alarm device according to any one of the appendices 25 to 29. The detection means is a light emitting means that emits light with respect to the detection space, and is from a mounting position with respect to the substrate. It is equipped with a light emitting means that is arranged in a state of being bent in a predetermined direction.
The substrate is a substrate hole provided at a position corresponding to a bent portion of the light emitting means, and includes a substrate hole through which an angle determining device for determining the mounting angle of the light emitting means with respect to the substrate can be inserted. ..
The alarm device according to the appendix 31 is an accommodating means for accommodating the detection means and the covering means inside in the alarm device according to the appendix 30, and the substrate in a state where the detecting means and the covering means are accommodated. A housing means having a closing means for closing the hole is provided.
The alarm device according to the appendix 32 is the alarm device according to the appendix 31, and the blocking means is a supporting means capable of supporting the detecting means.
The alarm device according to the appendix 33 is the alarm device according to any one of the items 25 to 32. The detection means is based on the light emitting side detecting means that emits light to the detection space and the amount of light received. Based on this, the light receiving side detecting means for detecting whether or not the substance to be detected is contained in the gas flowing into the detection space is provided, and the covering means passes through the covering means from the light emitting side detecting means. It has a light emitting hole for introducing light into the detection space, and a light receiving hole for introducing reflected light from the detection space to the light receiving side detecting means through the covering means.
The alarm device according to the appendix 34 is a groove formed around the light emitting hole or the light receiving hole on the surface of the covering means facing the detection space in the alarm device according to the appendix 33. It is provided with a groove that is recessed toward the side opposite to the detection space.
The alarm device according to Appendix 35 is, in the alarm device according to Appendix 33 or 34, a light-shielding means formed around the light emitting hole or the light receiving hole on the surface of the covering means facing the substrate. A light-shielding means that is arranged so as to be raised toward the substrate and that covers the periphery of the light-emitting side detecting means or the light-receiving side detecting means is provided.
In the method of manufacturing an alarm device according to Appendix 36, a detection means for detecting whether or not a substance to be detected is contained in the gas flowing into the detection space is attached to a substrate on which an element can be mounted at a predetermined angle. A mounting step of electrically mounting the detection means mounted on the substrate in the mounting step on the substrate while maintaining the predetermined angle, and a mounting step of electrically mounting the detection means on the substrate and the mounting step on the substrate. The covering means installation step of installing the covering means interposed between the substrate and the detection space so as to cover the mounted detection means is included.

[Effect of appendix]
According to the invention of Appendix 1, even if an object approaches the head of the screw from the front, it can be prevented from coming into contact with the rising portion and coming into contact with the head of the screw.
Further, the head of the screw of the mounting plate can be prevented from affecting the front side thereof. In addition, the rising part can be used as a guideline for the screw tightening depth, and the tightening depth and strength can be set appropriately according to the thickness of the mounting plate. Can be securely fixed to the installation surface.
According to the invention according to Appendix 2, even if the mounting plate side of the device body approaches the head of the screw, it contacts the rising portion and does not touch the head of the screw, so that the screw affects the device body. Can be prevented.
According to the invention according to Appendix 3, even if the battery approaches the head of the screw, it abuts on the rising portion and does not abut on the head of the screw, so that it is possible to prevent the screw from affecting the battery.
According to the invention according to Appendix 4, in the fire alarm, the head of the screw can be prevented from affecting the alarm body.
According to the invention according to Appendix 5, even if the device body approaches the screw head from the front, it abuts on the rising portion and does not abut on the screw head, so that the screw head affects the device body. Can be avoided.
Further, the head of the screw of the mounting plate can be prevented from affecting the main body of the device. In addition, the rising part can be used as a guideline for the screw tightening depth, and the tightening depth and strength can be set appropriately according to the thickness of the mounting plate. Can be securely fixed to the installation surface.
According to the invention according to Appendix 6, even if the mounting plate side of the device body approaches the head of the screw, it contacts the rising portion and does not touch the head of the screw, so that the screw affects the device body. Can be prevented.
According to the invention according to Appendix 7, a part of the sound generated by the vibration on the front side of the speaker can be transmitted to the back surface of the speaker through the penetrating portion, and can be efficiently resonated in the housing, and the sound pressure can be obtained. Can be improved.
Further, by resonating a part of the sound from the speaker in the housing, the sound pressure from the speaker can be improved. As a result, even a speaker having a small diameter can obtain a sound pressure equal to or higher than a predetermined value, so that the size of the housing can be reduced.
According to the invention according to Appendix 8, a closed space portion is formed between the substrate portion and the rear surface portion of the housing, and the sound from the speaker guided through the penetrating portion can be more easily resonated, and the sound can be easily resonated. The pressure can be further improved.
According to the invention according to Appendix 9, since the speaker is locked and fixed at a plurality of positions in the circumferential direction by the locking single portion, the speaker can be stably fixed to the substrate portion, and the speaker can be fixed due to environmental changes such as temperature or humidity. It is possible to suppress the change in the fixed state of.
According to the invention of Appendix 10, since the speaker is locked and fixed so as to be sandwiched between a pair of locking pieces from both sides, the speaker can be stably fixed to the substrate portion, and environmental changes such as temperature and humidity can be changed. Therefore, it is possible to suppress the change in the fixed state of the speaker.
According to the invention according to Appendix 11, one end of the speaker can be locked to the fixed locking piece, and then the other end of the speaker can be easily locked and fixed to the moving locking piece. The fixing work can be facilitated.
According to the invention of Appendix 12, the movable locking piece can be made elastically movable with a simple structure.
According to the invention of Appendix 13, it is possible to prevent the invasion of insects and the like through the penetrating portion, and it is possible to optimize the improvement of the sound pressure of the speaker by closing a part of the small holes.
According to the invention according to Appendix 14, the amount of deformation of the elastic piece can be increased, the locking and fixing of the speaker can be facilitated, and the slit portion becomes a penetrating portion, so that it is not necessary to form a separate penetrating portion, and the structure Can be simplified.
According to the invention of Appendix 15, the movable locking piece can be elastically moved with a simple structure, and the gap becomes a penetrating portion, so that it is not necessary to form a separate penetrating portion and the structure is simplified. it can.
According to the invention of Appendix 16, the operation button can be pressed so as to be tilted about the rotation shaft portion, and the locking portion is urged against the housing in the return operation direction of the operation button. The operation buttons can be securely fixed to the housing.
Further, the operation button can be pressed and returned with a simple structure, and since the number of parts is small, it is possible to suppress variations in the pressing operation due to component tolerances.
According to the invention of Appendix 17, the distance between the portion to be pressed and the rotating shaft portion can be increased, and a sufficient pressing depth of the operation button can be secured.
According to the invention of Appendix 18, the rotating shaft portion can be further separated from the operation portion, and the pressing depth of the operation button can be further increased.
According to the invention of Appendix 19, the operation button can be reliably operated in the return direction by the elastic deformation of the elastic piece due to the pressing of the operation button.
According to the invention of Appendix 20, when a drawstring is provided in the slit portion, when a large force is applied to the drawstring, the slit portion is deformed and the drawstring is pulled out, so that a large force is applied to the operation button and the housing. Can be prevented from being added.
According to the invention of Appendix 21, it is possible to prevent light from directly incident on the sensor portion from the outside while keeping the diameter of the smoke detection portion cover to a minimum.
In addition, the smoke detection unit can be miniaturized while maintaining the function of blocking light from external light, and the smoke detection unit cover can be arranged so as not to overlap with the speaker or the like in the miniaturized housing.
According to the invention of Appendix 22, the adjacent light-shielding wall portions can be arranged so as to overlap each other in the radial direction while providing a gap between the light-shielding wall portions.
According to the invention of Appendix 23, an intermittent circumferential surface can be formed on the outer peripheral side of the light-shielding wall portion, and the net member can be arranged on the outer peripheral side.
According to the invention of Appendix 24, since the light from the light emitting portion is scattered by the uneven shape of the light-shielding wall portion, the reflected light of the light from the light emitting portion incident on the sensor portion is reduced, and the sensor portion has. Malfunction can be prevented.
According to the alarm device described in Appendix 25, since the covering means does not interfere with the substrate and the detecting means, all the detecting means are set in the covering means, and then the covering means is covered with the substrate to form a through hole in the substrate. The work of simultaneously inserting the connecting wires of the detection means can be omitted, the mounting work of the detection means can be simplified, and the mechanism for attaching the detection means does not need to be provided in the covering means, so that the mechanism of the covering means It is possible to improve the productivity of the alarm device by simplifying the above.
According to the alarm device described in Appendix 26, since the detecting means includes the light receiving means and the noise preventing means is integrally formed with the light receiving means, the mounting work of the light receiving means and the noise preventing means can be simplified. It is not necessary to provide the covering means with a mechanism for attaching the light receiving means and the noise preventing means to the covering means, and the mechanism of the covering means can be simplified to improve the productivity of the alarm device.
According to the alarm device described in Appendix 27, since the outer edge of the covering means is provided with a flange for promoting the inflow of gas into the detection space, the amount of gas inflow into the detection space can be increased and the detection accuracy is improved. It becomes possible to make it.
According to the alarm device described in Appendix 28, since the power supply urging means on which the stress from the power supply unit always acts is integrally formed with the covering means which cannot be seen from the outside, it can be visually recognized from the outside like the accommodating means. Deformation due to the stress becomes less noticeable as compared with the case where the mechanism is provided, and poor appearance can be prevented.
According to the alarm device described in Appendix 29, since the storage means for accommodating the output means connected to the substrate is formed integrally with the covering means, the output means can be arranged on the same surface side as the substrate in the covering means, and the output means can be arranged. It is possible to improve the productivity of the alarm device by simplifying the connection to the board.
According to the alarm device described in Appendix 30, since the substrate is provided with a substrate hole through which the angle determining device can be inserted, the mounting angle of the light emitting means can be determined by an extremely easy method of inserting the angle determining device to suppress the light emitting means. It can be easily determined, and the productivity of the alarm device can be improved.
According to the alarm device described in Appendix 31, since the accommodating means is provided with the closing means for closing the substrate hole, it is possible to prevent erroneous detection due to the light of the light emitting means wrapping around from the substrate hole and being received by the light receiving means. This makes it possible to improve the detection accuracy.
According to the alarm device described in Appendix 32, since the blocking means can support the detecting means, the angle of the detecting means changes when an external force is applied to the detecting means for some reason, and the detection accuracy deteriorates. It is possible to prevent this from happening.
According to the alarm device described in Appendix 33, since the covering means includes a light emitting hole and a light receiving hole, the coating means covers the substrate to suppress the accumulation of dust on the substrate, and the light emitting hole and the light receiving hole emit light. The configuration can be such that the optical axes of the side detecting means and the light receiving side detecting means are not obstructed.
According to the alarm device according to the appendix 34, since the groove portion recessed toward the side opposite to the detection space is provided around the light emitting hole and the light receiving hole, the dust is accumulated on the groove portion to collect the dust on the covering means. It is possible to prevent the dust from accumulating at a high level, and it is possible to prevent the detection accuracy from being lowered due to the dust accumulated around the light emitting hole or the light receiving hole in the covering means being located on the light emitting shaft or the light receiving shaft. it can.
According to the alarm device according to Appendix 35, the light emitting side detecting means is provided so as to be arranged so as to be raised around the light emitting hole or the light receiving hole and to cover the periphery of the light emitting side detecting means or the light receiving side detecting means. It is possible to prevent erroneous detection due to the light from the light receiving directly received by the light receiving side detection means without passing through the detection space, and dust accumulated in the covering means is transmitted from the covering means through the light emitting hole or the light receiving hole. It is possible to prevent a situation in which the detection accuracy is lowered by falling on the light emitting side detecting means or the light receiving side detecting means and accumulating on the surface of the light emitting side detecting means or the light receiving side detecting means.
According to the method for manufacturing an alarm device according to Appendix 36, since the detecting means is attached to the substrate and electrically mounted, and then the covering means is installed, all the detecting means are set in the covering means and then covered. It is possible to omit the work of covering the means with the substrate and inserting the connection line of each detection means into the through hole of the board at the same time, simplifying the mounting work of the detection means, and covering the mechanism for attaching the detection means. It is not necessary to provide the means, and the mechanism of the covering means can be simplified to improve the productivity of the alarm device.

[Embodiment 1]
1 Alarm body 2 Mounting plate 10 Housing 11 Front surface 12 Smoke inflow port 13 Operation button 14 Sound hole 15 Mounting plate fixing part 16 Battery storage part 17 Battery 20 Alarm fixing surface part 21 Upper protruding part 22 Screw hole part 22a Insertion part 22b Slide part 23 Rising part 24 Locking piece part 30 Screw 31 Head [Embodiment 2-1 to 2-3]
201 Alarm body 210 Housing 211 Front surface 212 Rear surface 214 Operation button 215 Sound hole 216 Board part 217 Speaker 217c Speaker body 217d Ear part 217e Locking recess 218 Battery storage part 219 Battery 220 Speaker fixing part 221 Rising part 222 Base surface part 223 Fixed locking piece 224 Moving locking piece 225 Elastic piece 226 Penetration part 230 Board part 231 Speaker fixing part 232 Rising part 233 Base surface part 234 Fixed locking piece part 235 Moving locking piece part 236 Elastic piece 237 Slit part 240 Board part 241 Speaker fixing part 242 Rising part 243 Base surface part 244 Fixed locking piece part 245 Moving locking piece part 246 Island-shaped part 247 Bridge part 248 Gap part [Embodiment 3]
301 Alarm body 302 Mounting plate 310 Housing 310a Opening 310b Bearing 310c Locking receiver 310d Step 311 Front 312 Smoke inlet 313 Operation button 314 Sound hole 320 Operation 321 Outer extension 322 Rotating shaft 323 Elastic piece 324 Locking part 325 Rear extension part 326 Slit part 328 Edge part [Embodiment 4]
401 Alarm body 402 Mounting plate 410 Housing 411 Front front 421 Smoke inlet 413 Operation button 414 Sound hole 416 Battery storage 417 Battery 418 Speaker 430 Smoke detection part 431 Smoke detection area 432 Board part 433 Smoke detection part cover 434 Net member 435 Light emitting part 436 Sensor part 436a Detection position 437 Installation base part 440 Base part 441 Light-shielding wall part 441c Arc-shaped surface part 441d Concavo-convex surface part [Embodiment 5]
501 Mounting base 502 Case 503 Detection part cover 504 Detection part main body 505 Circuit part 511 Mounting hook 512 Main body part 512A Case side facing surface 512B Installation surface side facing surface 521 Back case 522 Front case 523 External inflow opening 531 Ceiling plate 532 Labyrinth 532e Labyrinth 533 Insect net 534 Detection space 535 Internal inflow opening 535a Internal inflow opening 535b Internal inflow opening 535c Internal inflow opening 535d Internal inflow opening 535e Internal inflow opening 541 Flange part 542 Inclined part 543 Raised part 544 Storage part 546 Element cover 547 Insertion hole 548 Battery holding spring 549 Bounce space 551 Circuit board 552 Light emitting part 553 Light receiving part 554 Shield 555 Switch 556 Board hole 557 Positioning hole 565 Rib 5100 Alarm device 5111 Screw hole 5121 Screw hole 5121 Part 5211 Back case side facing wall 5211a Induction recess 5211b Facing surface 5212 Back case side outer peripheral wall 5212a Back case side end 5213a Slit 5213b Slit 5214 Engaging part 5221 Front case side exposed wall 5222 Front case side outer peripheral wall 5222a Front case side end Part 5223 Push button 5224 Screw boss 5225 Support part 5226 Closing protrusion 5400a Detection part Main body side end 5411 Positioning recess 5431 Arrangement recess 5432 Light emitting recess 5433 Light receiving recess 5434 Groove 5435 Outer edge wall 5436 Light emitting hole 5437 Light receiving hole 5438 Component case 55612 Component case 55613 Component case 55613a Fixing screw 55613b Insertion hole 55614 Component case 55614a Fixing screw 55614b Insertion hole 55615 Component case 55616 Component case 55616a Outer housing wall 55616a Outer housing wall 556 Stopper part 55621 Short fin 55622 Short fin 55623 Short fin 55631 Long fin 55632 Long fin 55641 Prevention piece 55642 Prevention piece 55651 Rib 55652 Rib 55653 Rib 55654 Rib 55655 Rib 55656 Rib 55657 Rib 55658 Rib 55569 Rib 5700 Mounting jig 5701 Optical axis adjustment pin 5710 Base 5711 Light emitting part pocket 5712 Light receiving part pocket 5713 Slide member 5714 Spring 5715 Positioning protrusion 5716 Hole 5900 Installation surface Ar1 area Ar2 area Ar3 area CN1 Power connector F1 arrow F2 arrow F3 arrow F4 arrow F5 arrow F21 arrow F22 arrow P1 External stagnation point P2 Internal stagnation point

Claims (4)

A fire alarm that is an alarm device that is attached to the installation surface of an object to be installed, has an attachment surface that faces the installation surface, and has a smoke detector inside the housing.
A detection means for detecting smoke contained in gas, and
The accommodating means for accommodating the detecting means is provided.
The smoke detection unit is provided with a smoke detection unit cover so as to surround the smoke detection area in which the sensor unit is arranged, and the smoke detection unit cover has a plurality of light-shielding wall portions along the circumferential direction.
The light-shielding wall portion has a veneer shape and has an arc-shaped surface portion forming an outer peripheral surface of the smoke detection region, and a gap is formed between the adjacent light-shielding wall portions to communicate the inside and outside of the smoke detection region. At the same time, the light-shielding wall portions are arranged so as to overlap each other in the radial direction so that any of the light-shielding wall portions is located on the radiation centered on the detection position of the sensor portion .
The accommodating means has a first inflow opening extending in a direction along the mounting surface, and has a first inflow opening for allowing the gas to flow into the inside of the accommodating means.
The detection means has the smoke detection unit, a detection space is provided inside the smoke detection unit, and the detection means is configured to detect the smoke existing in the detection space.
The distance from the mounting surface to the detection space along the direction orthogonal to the mounting surface, and the distance from the detection space to the farthest point from the mounting surface is orthogonal to the mounting surface. The distance from the mounting surface to the first inflow opening along the direction of movement is set to be shorter than the distance to the portion of the first inflow opening closest to the mounting surface. The detection space is provided on the mounting surface side of the first inflow opening so that no part of the detection space is located in the first inflow opening.
A fire alarm that features that. The fire alarm according to claim 1, wherein the light-shielding wall portion is arranged and erected from the base portion of the smoke detection portion cover so as to be inclined in the radial direction along the circumferential direction of the smoke detection region. vessel. The first or second aspect of the present invention, wherein a light emitting portion is arranged in the smoke detection region, and an uneven shape is formed on at least a surface of the light shielding wall portion that receives light from the light emitting portion. Fire alarm. The invention according to any one of claims 1 to 3, wherein the arcuate surface portion of the plurality of light-shielding wall portions forms an intermittent surface along the outer periphery of the smoke detection region as the outer peripheral surface. Fire alarm.

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