JP2010218188A - Alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm for reducing any influence of vibration from a sound emitting component on an electronic component mounted on a circuit board. <P>SOLUTION: The alarm is provided with: a state (fire) detection part 2 for detecting a state (fire); a circuit board 3 on which the state (fire) detection part is mounted; a sound emitting component 4 for ringing alarm sound; and a casing 1 having a body 11 and a cover part 21 in which the circuit board 3 and the sound emitting component 4 are housed so as to be almost horizontally arranged, and so as not to be brought into contact with each other. The circuit board 3 is fixed to a plurality of support bodies 25 formed in the cover part 21, and the sound emitting component 4 is configured by fixing a flange section 41 for attachment to a body column 12 formed in the body 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an alarm device.

  For example, as a fire detector as an example of a conventional alarm device, “a piezoelectric buzzer 6 is mounted on a printed circuit board 7 and the printed circuit board 7 is screwed and fixed to the bottom surface of the body 3. A sensor portion 4 is attached to the top of the substantially mountain-shaped cover 2. A pair of pressing ribs 10 project from the inner surface of the cover 2 facing the piezoelectric buzzer 6 so as to contact the piezoelectric buzzer 6. Furthermore, a pair of side ribs 11 are provided on the bottom surface of the body 3 so as to abut against the peripheral surface of the piezoelectric buzzer 6. The plane including the pressing rib 10 and the plane including the side rib 11 are substantially orthogonal to each other. Therefore, the movement of the piezoelectric buzzer 6 in the vertical direction is restricted by the pressing rib 10 and the movement of the front and rear or the left and right is restricted by the side ribs 11 ”(see, for example, Patent Document 1).

JP-A-8-124058 (Summary, FIG. 1)

  In the technique disclosed in Patent Document 1, when the volume from the piezoelectric buzzer 6 is large, the cover 2 itself resonates due to the vibration of the piezoelectric buzzer 6. At this time, if the fixing balance between the body 3 and the printed circuit board 7 is poor, the vibration is transmitted to the printed circuit board 7, and as a result, there is a possibility that the electronic components on the printed circuit board 7 may be adversely affected. there were.

  The present invention has been made in order to solve the above-described problems, and provides an alarm device capable of reducing the influence of vibration from a sounding component on electronic components mounted on a circuit board. With the goal.

  An alarm device according to the present invention includes a state detection unit that detects a state, a circuit board on which the state detection unit is mounted, a sound generation component that sounds an alarm sound, a main body unit, and a cover unit. The circuit board is fixed to a plurality of supports provided in the cover portion, and the sound generating component has a mounting portion attached to the main body portion. It is fixed to the main body column provided.

  In addition, an alarm device according to the present invention includes a state detection unit that detects a state, a circuit board on which the state detection unit is mounted, a sound generation component that sounds an alarm sound, a main body unit, and a cover unit. And a housing that accommodates the sound generating parts in a side-by-side arrangement so that they do not contact each other, and the circuit board is fixed to a plurality of supports provided on the cover part, and the sound generating parts are mounted on the main body. It is sandwiched between a main body column provided in the part and a cover column provided in the cover part so that at least a part of the main body column vertically overlaps the main body column.

  In addition, the alarm device according to the present invention is provided with a pair of sounding part mounting parts near both sides of the sounding part, and a pair of main body columns so as to face the mounting part, And the main body support are fixed.

  In the alarm device according to the present invention, a plurality of supports are provided at two or more locations at substantially equal intervals.

  In the present invention, the circuit board and the sound production component are accommodated in the casing so as not to be in contact with each other, the circuit board is fixed to a plurality of supports provided in the cover portion, and the sound production component is attached to the mounting portion. However, the vibration transmission path from the sound producing component is a path of the main body part → the cover part → the circuit board. Accordingly, the vibration from the sound producing component is sufficiently attenuated before reaching the circuit board, and the influence on the electronic component mounted on the circuit board can be sufficiently reduced.

  In addition, the circuit board and the sounding component are accommodated in the casing so as not to be in contact with each other side by side, the circuit board is fixed to a plurality of supports provided in the cover part, and the sounding part is attached to the main body. The transmission path of vibration from the sound producing part is the body part → cover because it is sandwiched between the main body pillar provided in the part and the cover pillar provided in the cover part so that at least a part of the main body pillar overlaps vertically Part → circuit board. Accordingly, the vibration from the sound producing component is sufficiently attenuated before reaching the circuit board, and the influence on the electronic component mounted on the circuit board can be sufficiently reduced. In addition, the main body part, the cover part, and the sound producing part can be fixed together.

  In addition, a pair of sounding part mounting parts are provided near both sides of the sounding part, and a pair of main body columns are provided so as to face the mounting part, so that the mounting part and the main body column are fixed near both sides of the sounding part. As a result, the vibration transmitted from the sound producing component to the main column can be reduced as compared with the case of fixing at a distant position.

  In addition, since the plurality of support bodies are provided at two or more positions at approximately equal intervals, the influence on the electronic components mounted on the circuit board when the vibration of the sound producing component is transmitted to the circuit board can be reduced. .

It is sectional drawing of the fire alarm device 100 which concerns on Embodiment 1 of this invention. It is a bottom view of the fire alarm device 100 which concerns on Embodiment 1 of this invention. It is a YY cross-sectional schematic diagram of FIG. 4A is a bottom view of the main body 11 in FIG. 1, and FIG. 4B is a side view in the direction of arrow A in FIG. 4A. It is a top view in the state where circuit board 3 was attached to cover part 21 of FIG. It is principal part sectional drawing of the fire alarm 100 which concerns on Embodiment 2 of this invention. FIG. 7 is a plan view of a state in which the circuit board 3 is attached to the cover portion 21 of FIG. 6 and the sound generation component is placed on the cover column 27 provided on the cover portion 21. 8A is a bottom view of the main body 11 in FIG. 6, and FIG. 8B is a side view in the direction of arrow B in FIG. 8A.

Below, the case where this invention is applied to the fire alarm which a state detection part detects a fire is demonstrated to an example.
Fire alarms include various fire alarms such as fire alarms that detect smoke with light emitting and receiving elements, fire alarms that detect heat with heat sensitive elements, and fire alarms that detect flame with pyroelectric elements. Exists. In each of the following embodiments, a case will be described in which the present invention is applied to a fire alarm device that detects smoke with a light emitting element and a light receiving element.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of a fire alarm 100 according to Embodiment 1 of the present invention. FIG. 1 corresponds to a cross section of the XX portion of FIG. 2 below, but for convenience of explanation, the fire alarm device 100 is illustrated in an arrangement state in which the orientation of the illustration is changed and the ceiling surface is installed. FIG. 2 is a bottom view of fire alarm 100 according to Embodiment 1 of the present invention. 1 and 2 are the same as those in Embodiment 2 described later. 3 is a schematic cross-sectional view taken along the line YY in FIG. 4A is a bottom view of the main body 11 in FIG. 1, and FIG. 4B is a side view in the direction of arrow A in FIG. 4A. FIG. 5 is a plan view of the state in which the circuit board 3 is attached to the cover portion 21 of FIG. Hereinafter, the fire alarm device 100 according to the present embodiment will be described with reference to FIGS. In the following description, it demonstrates according to the up-down and left-right direction of FIG.1 and FIG.3.

  The fire alarm 100 is housed in the housing 1, the fire detection unit 2 that detects fire, the circuit board 3 on which the fire detection unit 2 and the like are mounted, and when a fire is detected. For example, a sounding component 4 including a piezoelectric element (speaker, buzzer, etc.) that sounds an alarm sound is provided, and the circuit board 3 and the sounding component 4 are accommodated substantially sideways in the housing 1.

  The housing 1 includes a disk-shaped main body 11 and a bottomed cylindrical cover 21 that covers the main body 11. The cover portion 21 has a shape in which the bottom surface portion 22 is inclined downward from the outer peripheral portion toward the central portion. A smoke inlet 23 for allowing smoke to flow into the fire detection unit 2 is opened at substantially the center of the bottom surface portion 22 of the cover portion 21. The fire detection unit 2 detects smoke generated in the event of a fire, and includes a light emitting element (not shown) and a light receiving element (not shown) inside. And a fire is detected by the increase in the received light quantity of the scattered light which generate | occur | produces when smoke flows into the fire detection part 2. FIG. The fire detection unit 2 is accommodated in the housing 1 such that the bottom side thereof faces the smoke inlet 23 of the cover unit 21.

  In addition, an acoustic hole 24 for releasing an alarm sound emitted from the sound producing component 4 to the outside of the housing 1 is provided on the bottom surface portion 22 of the cover portion 21, and the sound producing component 4 faces the acoustic hole 24. Is accommodated in the housing 1. The casing 1 is provided with a warning sound stop switch 31 for stopping the warning sound from the sound producing component 4.

  In this example, the sound generating component 4 as a vibration source is fixed to the main body 11 side, and the circuit board 3 to be protected from vibration is fixed to the cover 21 side, and the circuit board 3 and the sound generating component 4 are arranged substantially side by side so as not to contact each other. It is characterized in that it is possible to suppress the vibration of the sound producing component 4 from being transmitted to the circuit board 3 by being housed in the housing 1. Hereinafter, the fixing structures of the sound producing component 4 and the circuit board 3 will be described in detail.

(Fixing structure of sound producing part 4)
As shown in FIGS. 3 and 4, the main body portion 11 to which the sound producing component 4 is fixed includes a pair of main body support columns 12 erected toward the cover portion 21 side. A screw hole 12 a that communicates with a pair of insertion holes 41 a provided in the mounting flange 41 of the sound producing component 4 is formed on the lower surface of the pair of main body columns 12. The sound producing component 4 is fixed to the main body column 12 by tightening the screw 13 inserted into the insertion hole 41 a into the screw hole 12 a of the main column 12.

  In the mounting flange portion 41 of the sound producing component 4, a pair of insertion holes 41 a for inserting the screw 13 are provided in the vicinity of both the left and right sides of the sound producing component 4. Thus, by fixing the vicinity of the vibration source to the main body column 12, the vibration of the sound producing component 4 is prevented from increasing in the process of being transmitted to the main column 12.

  Further, on the cover portion 21 side of the main body portion 11, a pressing column 14 is erected downward from between the pair of main column columns 12, and the front end surface (lower end surface) of the pressing column 14 is a sound producing component. 4 is abutted against the upper surface of 4 and regulates the vertical vibration of the sound producing component 4. Unlike the patent document 1, the sound producing component 4 attached in this way is accommodated in the housing 1 without contacting the cover portion 21.

(Fixed structure of circuit board 3)
As shown in FIGS. 1 and 5, the cover portion 21 to which the circuit board 3 is fixed has a plurality of (three in this case) cover columns 25 erected from the bottom surface portion 22 toward the main body portion 11 side. The upper surface of the cover column 25 is formed with a screw hole 25a communicating with the insertion hole 3a provided in the circuit board 3. The circuit board 3 is placed on the cover column 25, and the screw 26 inserted through the insertion hole 3 a of the circuit substrate 3 is fastened to the screw hole 25 a of the cover column 25 to be fixed to the cover column 25. The fixing points (screwing points) are distributed in the plane of the circuit board 3 so that the fixing points of the circuit board 3 are not biased in the plane of the circuit board 3. Specifically, it arrange | positions so that the space | interval of each screwing location may become equal intervals, and the cover support | pillar 25 is also arrange | positioned so that it may mutually become equal intervals according to the screwing location. In the example of FIG. 5, screw locations are arranged at positions that constitute a substantially equilateral triangle. By arranging in this way, the vibration when the vibration of the sound producing component 4 is transmitted to the circuit board 3 is dispersed, and the electronic components mounted on the circuit board 3 (particularly, capacitors and microcomputers that are weak against vibration), etc. It is possible to reduce the influence on each circuit including.

  Further, a plurality (three in this case) of hook portions 27 are provided at equal intervals on the outer peripheral portion of the cover portion 21, and the hook receiving portions 15 (see FIG. The cover part 21 and the main body part 11 are fixed with good balance. Further, the circuit board 3 is configured not to contact the main body 11 and the sound producing component 4 directly or indirectly in a state where the cover 21 is attached to the main body 11. Furthermore, a fixing part (hook receiving part 15 and hook part 27) for fixing the main body part 11 and the cover part 21 and a fixing part (cover column 25 and screw) for fixing the cover part 21 and the circuit board 3 are provided. The fixing portions are arranged so that the holes 3a) are located as far as possible from each other. This prevents the vibration from the sound producing component 4 from being transmitted to the circuit board 3 as much as possible.

  In the fire alarm device 100 configured as described above, the sound producing component 4 rings and vibrates when the fire detection unit 2 detects a fire. This vibration is transmitted from the sound producing component 4 to the entire main body 11 through the main body column 12. Here, since the main body column 12 and the mounting flange portion 41 of the sounding component 4 are fixed in the vicinity of the sounding component 4, vibration transmitted to the main body column 12 is reduced as compared with the case where the main column 12 is fixed at a distant position. it can. In addition, since the upper surface of the sound producing component 4 is held by the holding column 14, the vertical vibration of the sound producing component 4 is suppressed.

  The vibration transmitted to the main body portion 11 is transmitted to the cover portion 21 and further transmitted to the circuit board 3. Transmission of vibration from the cover portion 21 to the circuit board 3 is performed via a fixing portion (screwing location) for fixing both, but in this example, the screwing locations are equally spaced from each other. Therefore, the vibration is evenly distributed in the circuit board 3. Therefore, it is possible to reduce the influence of vibration on the electronic components mounted on the circuit board 3.

  Further, a fixing part (hook receiving part 15 and hook part 27) for fixing the main body part 11 and the cover part 21 and a fixing part (cover support column 25 and screw) for fixing the cover part 21 and the circuit board 3 are provided. Since the holes 3a) are positioned as far as possible from each other, the influence of vibration on the electronic components mounted on the circuit board 3 can be reduced also from this point.

  The circuit board 3 is accommodated in the housing 1 so as not to contact the sound producing component 4 and the main body 11, and the vibration transmission path from the sound producing component 4 is the main body 11 → the cover 21 → the circuit board. The route is 3. Therefore, the vibration from the sound producing component 4 is sufficiently attenuated in the path until it reaches the circuit board 3, and the influence on the electronic components mounted on the circuit board 3 can be sufficiently reduced.

  As described above, the fire alarm device 100 of the present example can reduce the influence of vibration on the electronic components and the like mounted on the circuit board 3 when the alarm sound is sounded. Therefore, even if the alarm sound is loud, the function of the original electrical component can be maintained, and the fire alarm device 100 can function normally without malfunctioning. When stopping the alarm sound, the switch 31 is pressed to stop.

Embodiment 2. FIG.
In the second embodiment, the cover portion 21 is also fixed together at the fixing portion of the sound producing component 4 of the first embodiment.

FIG. 6 is a cross-sectional view of a main part of the fire alarm 100 according to Embodiment 2 of the present invention, and is a YY cross section of FIG. FIG. 7 is a plan view of the state in which the circuit board 3 is attached to the cover portion 21 of FIG. 6 and the sound producing component 4 is placed on the cover column 28 provided on the cover portion 21. 8A is a bottom view of the main body 11 in FIG. 6, and FIG. 8B is a side view in the direction of arrow B in FIG. 8A. 6 to 8, the same parts as those of the thirteenth embodiment shown in FIGS. In the following, the second embodiment will be described focusing on the differences from the first embodiment.
Instead of the screw hole 12a of the first embodiment, the main body column 12 is formed with a through hole 12b having a recess. The cover portion 21 is provided with a pair of cover struts 28 extending toward the main body portion 11 so as to face the pair of main body struts 12. A screw hole 28 a that communicates with the through hole 12 b of the main body column 12 and the insertion hole 41 a of the mounting flange portion 41 is provided on the front end surface of the cover column 28.

  In the housing 1 configured as described above, the mounting flange portion 41 is sandwiched between the front end surface of the cover column 28 and the lower surface of the main body column 12. Then, the screw 13 is inserted into the through hole 12b of the main body column 12 and the insertion hole 41a of the mounting flange portion 41, the head of the screw 13 is locked to the step of the through hole 12b, and the shaft portion of the screw 13 is covered. These are fixed together by being fastened to the screw holes 28a of the columns 28.

  In the first embodiment, the three hook portions 27 are provided at equal intervals on the outer peripheral portion of the cover portion 21. However, in the second embodiment, the cover portion 21 and the main body portion are provided at two locations on the mounting flange portion 41. In this case, the hook portion 27 is provided at one location in order to be fixed to the screw 11. The hook portion 27 is arranged at the apex portion of the isosceles triangle with the two fixing locations of the mounting flange portion 41 on the base side of the isosceles triangle on the outer periphery of the cover portion 21. Provided. Thereby, the main-body part 11 and the cover part 21 can be fixed with sufficient balance.

  In the second embodiment, the mounting flange portion 41 of the sound producing component 4 comes into contact with the cover portion 21, but since the position is securely fixed by the screw 13, vibration transmitted to the cover portion 21 can be negligible. . Therefore, most of the vibration from the sound producing component 4 is transmitted from the main body 11 → the cover 21 → the circuit board 3.

  According to the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained, and the main body 11, the sound producing component 4, and the cover 21 can be fixed together by the screw 13.

  The cover column 28 may be configured to be arranged so that at least a part thereof overlaps the main column 12 and can be fixed by sandwiching the mounting flange 41 together with the main column 12.

  In each of the above embodiments, the sound generating component 4 is fixed to the main body 11 and the circuit board 3 is fixed to the cover 21. However, the circuit board 3 is fixed to the main body 11 and the sound generating component 4 is fixed to the cover 21. It is good also as the structure which carried out.

  In the present embodiment, the present invention is applied to the fire alarm 100 that detects smoke by the light emitting element and the light receiving element, but the fire alarm 100 that detects heat by the thermal element and the fire that detects flame by the pyroelectric element. The present invention can be implemented in various fire alarm devices 100 such as the alarm device 100. Furthermore, the present invention may be applied to an alarm device for detecting an abnormality.

  DESCRIPTION OF SYMBOLS 1 Case, 2 Fire detection part, 3 Circuit board, 3a Insertion hole, 4 Sound production | generation part, 11 Main body part, 12 Main body support | pillar, 12a Screw hole, 12b Through-hole, 13 Screw, 14 Pressing support | pillar, 15 Hook receiving part, 21 Cover part, 22 Bottom part, 23 Smoke inlet, 24 Acoustic hole, 25 Cover column, 25a Screw hole, 26 Screw, 27 Hook part, 28 Cover column, 28a Screw hole, 31 Switch, 41 Mounting flange part, 41a Insertion hole, 100 fire alarm.

Claims (4)

A state detector for detecting the state;
A circuit board on which the state detection unit is mounted;
A sounding part that sounds an alarm sound;
A main body portion and a cover portion, and a housing that accommodates the circuit board and the sounding component so as not to contact each other substantially side by side,
The circuit board is fixed to a plurality of supports provided in the cover part,
The alarm part, wherein the sound generating component is fixed to a main column provided in the main unit. A state detector for detecting the state;
A circuit board on which the state detection unit is mounted;
A sounding part that sounds an alarm sound;
A main body portion and a cover portion, and a housing that accommodates the circuit board and the sounding component so as not to contact each other substantially side by side,
The circuit board is fixed to a plurality of supports provided in the cover part,
The sound generating part is clamped between a main body column provided in the main body unit and a cover column provided in the cover unit so that at least a part of the mounting part overlaps the main body column vertically. Alarm device characterized.   A pair of the attachment parts of the sound producing part is provided near both sides of the sound producing part, and a pair of the main body struts are provided so as to face the attachment part, and the attachment part and the body are provided near both sides of the sound producing part. 3. The alarm device according to claim 1, wherein the support post is fixed.   The alarm device according to any one of claims 1 to 3, wherein the plurality of supports are provided at two or more locations at substantially equal intervals.

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