JP2020102147A - Alarm unit - Google Patents

Abstract

To provide an alarm device with an improved visibility of light.SOLUTION: An alarm device that emits an alarm when an abnormal condition is detected comprises an upper case 11 and an LED 40 provided on a printed circuit board 30. The upper case 11 has lamp grooves 15 and 16 and a hole 11a for guiding light from the LED 40. The lamp grooves 15 and 16 reflect the light emitted from the hole 11a.SELECTED DRAWING: Figure 5

Description

The present invention relates to an alarm device.

An alarm device that detects a gas leak or the generation of carbon monoxide and issues an alarm is generally provided with a lamp such as an LED inside the alarm device, and the light of the lamp is emitted to the outside through a lens provided on the upper cover ( See, for example, Patent Documents 1 to 3.). In the alarm device proposed in Patent Document 1, a lens portion is provided at a corner of one side surface of a rectangular box-shaped housing, and a display panel is mounted on a substrate so as to face a display window through the lens portion. ing. Further, in the alarm device proposed in Patent Documents 2 and 3, a tapered surface is provided between a front surface of a rectangular box-shaped housing and a side surface orthogonal to the front surface, and an opening portion is formed in the tapered surface. A PC board that covers the opening is provided, and the LEDs are arranged on the back side of the opening.

JP, 2017-58716, A JP, 2005-18174, A JP 2006-338693 A

When the alarm device is installed on the ceiling, the visibility from the direction other than the side surface provided with the lens portion or the surface facing the tapered surface provided with the opening is deteriorated. In addition, the provision of a lens on the alarm increases the manufacturing cost.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an alarm device that has good visibility of light and has reduced cost.

In order to achieve the above-mentioned object, the alarm device according to the present invention is characterized by the following (1) to (6).
(1) An alarm device that emits an alarm when an abnormal state is detected,
A case,
A light source provided in the case,
The case is
An inclined surface or a curved surface provided on a part of the case,
A light guide portion that guides light from the light source, the light guide portion being provided on the inclined surface or the curved surface,
The sloping surface or the curved surface reflects the light emitted from the light deriving unit.
(2) The alarm device according to (1) above, wherein the case further includes a bridge provided on an upper portion of the light guiding portion.
(3) The bridge has an inclined surface or a curved surface facing the light source, and directs the light guided from the light guiding section to at least one of the inclined surface or the curved surface of the case and the outside of the case. The alarm device according to (2) above, which is reflected toward the alarm device.
(4) The alarm device according to (2) or (3), wherein the sloped surface or the curved surface of the case is provided on both sides of the bridge.
(5) The alarm device according to any one of (1) to (4) above, wherein a tapered wall having a width wider than that of the light guiding portion is provided on an inclined surface or a curved surface of the case.
(6) The case has a circular shape,
The light source is provided inside the case,
The inclined surface or the curved surface of the case is a part of a groove extending in the radial direction of the circle, which is recessed so that the part of the case is close to the end of the light source,
The light guide portion is a hole provided in the upper part of the light source in the part of the groove,
The alarm device according to any one of (2) to (4) above, wherein the bridge is provided over the opening of the groove.

According to the alarm device having the above configuration (1), the light emitted from the light source is reflected by the inclined surface or the curved surface, so that the visibility is improved. Further, since the lens is not provided in the case, the cost for providing the lens can be reduced, and the illuminance of light becomes higher than that in the case of passing through the lens, so that the visibility is improved.

According to the alarm device having the above configuration (2), the distance from the light source to the finger can be maintained by the bridge. Therefore, if there is no bridge, static electricity may fly from the human body (finger) into the case through the light lead-out portion, but this bridge can prevent failure of the alarm device due to static electricity. The light source can be protected by the bridge. Further, the light emitted from the light source and led out from the light lead-out portion hits the bridge and is diffused, so that the visibility from multiple directions is improved. Further, since the direct light emitted from the light guiding portion is blocked by the bridge, it is possible to prevent the direct light from entering the eyes.

According to the alarm device having the above configuration (3), the light reflected by the sloped surface or the curved surface of the bridge strikes the sloped surface or the curved surface of the case, so that the sloped surface or the curved surface of the case emits surface light. In addition, the light reflected by the slope or the curved surface of the bridge is emitted to the outside of the case, so that the light reflected by the slope or the curved surface of the bridge can be visually recognized in addition to the light directly guided from the light guiding portion. Therefore, the visibility is improved.

According to the alarm device having the above configuration (4), the light reflected by the bridge is reflected by the slopes or curved surfaces on both sides of the bridge, so that the visibility is further improved.

According to the alarm device having the above configuration (5), the light from the light guiding portion (light source) is diffused by the tapered wall, so that the visibility is further improved.

According to the alarm device of the above configuration (6), the light from the light source is led out from the hole, reflected by the bridge, and filled in the groove extending in the radial direction of the circular case. Therefore, when the light guide portion (light source) and the groove are provided in the peripheral portion of the case, the light can be seen from the opposite side in the radial direction of the case, and the visibility is improved.

According to the present invention, the light emitted from the light source is reflected by the inclined surface or the curved surface, so that it is possible to provide the alarm device in which the visibility of the light is improved.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter, referred to as “embodiment”) with reference to the accompanying drawings. ..

FIG. 1 is a perspective view showing the external appearance of the alarm device of this embodiment. FIG. 2 is an enlarged view of the vicinity of the lamp section shown in FIG. FIG. 3 is a sectional view taken along the line AA of the lamp portion shown in FIG. FIG. 4 is a plan view of the lamp unit shown in FIG. FIG. 5 is a diagram for explaining the mechanism of surface emission of the lamp section shown in FIG. FIG. 6 is a diagram for explaining a light emitting state of the lamp unit shown in FIG. FIG. 7 is a diagram showing the alarm device 1A of the first embodiment. FIG. 8 is a diagram showing an alarm device 1B of the second embodiment. FIG. 9 is a diagram showing an alarm device 1C of the third embodiment.

Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of an alarm device 1 of this embodiment. FIG. 2 is an enlarged view of the vicinity of the lamp section shown in FIG. FIG. 3 is a sectional view taken along the line AA of the lamp portion shown in FIG. FIG. 4 is a plan view of the lamp unit shown in FIG. The alarm device 1 of the present embodiment is a ceiling-mounted type that is used by being mounted on the ceiling, detects city gas lighter than air and carbon monoxide in combustion exhaust gas to detect gas leakage and incomplete combustion equipment. When an abnormal state such as combustion is detected, a warning is given by emitting light and generating a buzzer sound.

As shown in FIG. 1, the alarm device 1 includes a case body 10 including an upper case 11 and a lower case 12, a printed circuit board 30 (see FIG. 3) housed in the case body 10, and a part of the upper case 11. And a lamp unit 13 provided on the. The case body 10 includes a circular upper case 11 and a circular lower case 12 that fits into the upper case 11. The lower case 12 is attached to a mounting base provided on a ceiling (not shown). A printed circuit board 30 is provided inside the case body 10. On the upper case 11 side of the printed circuit board 30, a plurality of light source LEDs (hereinafter simply referred to as LEDs) 40, various electronic components such as a central processing unit (CPU) not shown, and gas leaks to be detected are detected. A gas sensor, a CO sensor that detects the concentration of carbon monoxide, an alarm buzzer that generates an alarm sound, and the like are mounted. Based on the detection signals detected by the gas sensor and the CO sensor, the CPU outputs an alarm signal to the LED 40 and an alarm buzzer when it detects that the gas has leaked or the carbon monoxide concentration has exceeded the specified value. Is emitted to generate an alarm buzzer sound. Note that the warning by the warning buzzer may not be issued and only the warning by the light emission of the LED 40 may be issued. The plurality of LEDs 40 are composed of, for example, three LEDs corresponding to green, yellow, and red, and are arranged at positions corresponding to the lamp section 13 on the printed circuit board 30. That is, the LED 40 is provided on the case body 10 via the printed circuit board 30.

The configuration of the ramp unit 13 will be described with reference to FIGS. 2, 3, and 4. The lamp portion 13 has a structure for causing the light from the LED 40 traveling straight ahead to emit light over a wide area, and is provided near the outer peripheral edge of the upper case 11 (a position closer to the outer peripheral edge than the central position of the upper case 11). In the present embodiment, the left side in FIG. 3 is called the front and the right side is called the rear. The lamp unit 13 has a unit including a bridge 14 and lamp grooves 15 and 16 in three rows corresponding to respective positions of the three LEDs 40.

The bridge 14 is formed concentrically with the outer circumference of the upper case 11, and is installed in the openings of the ramp grooves 15 and 16 in a direction perpendicular to the extending direction of the ramp grooves 15 and 16. The bridge 14 is provided right above the LED 40 and reflects the light from the LED 40 into the lamp grooves 15 and 16. The width of the bridge 14 is formed to be sufficiently shorter than the length in the extending direction of the lamp grooves 15 and 16 in a plan view (see FIG. 4 ), and the light reflected inside the lamp grooves 15 and 16 is generated by the bridge 14. It is diffused to the outside of the upper case 11 through the openings on both sides. As shown in FIG. 3, the bridge 14 has a bridge bottom surface 14a and a bridge side surface 14b. The bridge bottom surface 14a is formed by a V-shaped inclined surface in the cross-sectional view of FIG. 3, and the light emitted from the LED 40 is directly above the LED 40 inside the lamp grooves 15 and 16 described later and outside the upper case 11 (see FIG. 5, see FIG. 6). The bridge side surface 14b connects the bridge bottom surface 14a and the upper surface of the upper case 11. In addition, the bridge bottom surface 14a may be formed by a curved surface instead of an inclined surface.

The ramp grooves 15 and 16 are grooves (slopes or curved surfaces) formed by pushing down a part of the upper surface of the upper case 11 to the vicinity of the tip of the LED 40 (depressing the inside of the case body 10 ). It extends in a substantially radial direction (direction intersecting with the peripheral portion of the upper case 11). The upper case 11 has a hole 11a (light lead-out portion) for leading out light from the LED 40, just above the LED 40 and at the end of the lamp grooves 15 and 16. That is, the lamp groove 15 extends forward from the hole 11a (LED40) (toward the peripheral portion of the upper case 11), and the lamp groove 16 extends rearward from the hole 11a (LED40) (the central portion of the upper case 11). Toward).

The upper case 11 is provided with a hole 11a communicating with the printed circuit board 30, but this design is suitable for a ceiling-mounted alarm device. Since the alarm device for LP gas is installed within 30 cm from the floor surface, if there is a hole (hole) or gap in the alarm device, water and oil will likely enter the inside of the alarm device. The alarm is designed to have no holes or gaps that communicate with the internal board. However, in the case of a ceiling-mounted alarm device, what is considered to be attached to the alarm device is a gas such as steam or water vapor, and it is unlikely that liquid or the like will directly enter the alarm device. In addition, since the ceiling-mounted alarm device is turned upside down during installation, even if there are holes or gaps in the case, it is more difficult for water and oil to adhere to the substrate than for the LP gas alarm device. It is an environment. Therefore, in the present embodiment, the lamp grooves 15, 16 and the hole 11a are provided in the upper case 11, but the lens that covers the opening is unnecessary. Therefore, the cost for providing the lens can be reduced. On the other hand, since the alarm device 1 does not have a lens, static electricity may fly from the human body (finger) into the case body 10 through the hole 11a. In this regard, as shown in FIG. 3, by providing the bridge 14, the static electricity distance from the upper surface of the bridge 14 to the printed circuit board 30 can be secured, so that the failure of the alarm device 1 due to static electricity can be prevented. That is, the bridge 14 plays a role of preventing static electricity in addition to the role of diffusing the light from the LED 40 therebelow. Further, the LED 14 can be protected by the bridge 14. Further, by blocking the direct light emitted from the LED 40 through the hole 11a by the bridge 14, it is possible to prevent the direct light from entering the eyes.

Further, the structure of the lamp grooves 15 and 16 and the mechanism of surface emission of the lamp portion 13 will be described with reference to FIGS. 5 and 6. 5A and 5B are views for explaining the mechanism of surface emission of the lamp unit 13 shown in FIG. 3, FIG. 5A is a sectional view taken along the line AA in FIG. 2 of the lamp unit 13, and FIG. 5B is a lamp unit. 13 is a plan view of FIG. 13, and FIG. 5C is a schematic view showing a light emitting state of the lamp unit 13. FIG. 6 is a diagram for explaining a light emitting state of the lamp unit 13 shown in FIG. The LED 40 is shown in a simplified manner in FIG. The lamp groove 15 has a bottom wall 15a, a first reflection wall 15b, a second reflection wall 15c, and a peripheral wall 15d. The bottom wall 15a has a curved wall surface, and reflects the light emitted from the LED 40 and the light reflected by the bridge bottom surface 14a. The first reflection wall 15b forms a taper wider than the hole 11a (LED40) and is connected to the bottom wall 15a, the second reflection wall 15c, and the peripheral wall 15d. The first reflecting wall 15b and the rear side wall of the peripheral wall 15d connected to the first reflecting wall 15b diffuses the light emitted from the LED 40 and reflected by the bridge bottom surface 14a, and the diffused light is second reflected. The light is reflected to the wall 15c and the side wall of the peripheral wall 15d that is connected to the second reflection wall 15c. The second reflection wall 15c receives the light reflected by the bridge bottom surface 14a and the first reflection wall 15b together with the side wall of the peripheral wall 15d connected to the second reflection wall 15c, and makes the entire lamp unit 13 emit light brighter. The peripheral wall 15d connects the bottom wall 15a, the first reflection wall 15b, and the second reflection wall 15c to the upper surface of the upper case 11. The lamp groove 16 has the same configuration as the lamp groove 15, and includes a bottom wall 16a, a first reflection wall 16b, a second reflection wall 16c, and a peripheral wall 16d. As shown in the sectional views of FIGS. 3 and 6, the bottom walls 15a and 16a of the ramp grooves 15 and 16 form curved surfaces having similar curvatures. In the ramp grooves 15 and 16, the normal direction of the bottom walls 15a and 16a is an angle from the thickness direction of the case body 10 (the normal direction of the mounting surface of the printed circuit board 30) from the end on the hole 11a side. It changes so as to continuously increase toward the ends on the side connected to the peripheral walls 15d and 16d. In addition, the normal direction of the side wall of the peripheral walls 15d and 16d that is connected to the bottom walls 15a and 16a has an angle with the thickness direction of the case body 10 (the normal direction to the mounting surface of the printed circuit board 30) that is the bottom wall. It is smaller than the maximum value in 15a and 16a.

The entire lamp section 13 (the surface that receives the light from the LED 40 and its reflected light) is mirror-finished. Therefore, the reflectance of light is improved. Thus, the light from the LED 40 causes the entire lamp unit 13 to emit light.

According to the alarm device 1 of the present embodiment, the light from the LED 40 is led out from the hole 11a, reflected by the bridge 14, and filled in the lamp grooves 15 and 16 extending in the radial direction of the upper case 11. Therefore, when the lamp portion 13 is provided on the peripheral portion (front side) of the upper case 11, light can be seen from the rear side (opposite side in the radial direction of the upper case 11) and the visibility is improved. In particular, since the bottom walls 15a and 16a of the lamp grooves 15 and 16 are curved, it is easy to collect light, and there is a great effect on light diffusion. Further, the curved bottom walls 15a and 16a also collect the reflected light from the bridge 14 to further increase the illuminance of the light. Further, as shown in FIG. 6, the light emitted from the LED 40 and led out from the hole 11a is reflected to the outside of the upper case 11 by the bridge bottom surface 14a, so that the light can be visually recognized from the rear of the alarm device 1. In addition, since the lens is not provided in the upper case 11, the cost for providing the lens can be reduced, and the illuminance of light is higher than that when light is transmitted through the lens, so that the visibility is improved. The wall surfaces of the bottom walls 15a and 16a do not necessarily have to be curved surfaces, and may be sloped surfaces. When the wall surfaces of the bottom walls 15a and 16a form slopes, the light collecting property and the light diffusing property are inferior to when the wall surfaces of the bottom walls 15a and 16a are curved surfaces, but the light reflected from the bridge 14 is collected. Thus, a highly visible alarm device can be realized.

7(a) and 7(b) are plan views, FIG. 7(c) is a perspective view from the front, and FIG. 7(d) is a diagram showing an alarm device 1A of the first embodiment. FIG. 4 is a perspective view from the rear. In the alarm device 1A, the bridge 14 and the ramp groove 16 are not provided in the alarm device 1, and the length of the ramp groove 15 is shorter than that of the ramp groove 15 shown in FIGS. As shown in FIG. 7D, the light of the LED 40 cannot be seen from the rear, but as shown in FIGS. 7A to 7C, the light can be clearly seen from the front.

8(a) and 8(b) are plan views, FIG. 8(c) is a perspective view from the front, and FIG. 8(d) is a diagram showing an alarm device 1B of the second embodiment. FIG. 4 is a perspective view from the rear. The alarm device 1B is the alarm device 1A provided with a bridge 14 and a ramp groove 16. In FIG. 8, the length of the ramp grooves 15 and 16 is longer than that of the ramp groove 15 of FIG. 7 and shorter than that of the ramp grooves 15 and 16 of FIGS. Compared with the alarm device 1A of FIG. 7, the length of the lamp grooves 15 and 16 is extended and the light emitting area is increased, so that the light of the LED 40 can be clearly seen from the front as shown in FIGS. 8(a) to 8(c). In addition, as shown in FIG. 7D, light can be seen from the rear. In addition, since the alarm device 1B has the bridge 14, measures against static electricity are also realized.

9(a) and 9(b) are plan views, FIG. 9(c) is a perspective view from the front, and FIG. 9(d) is a diagram showing an alarm device 1C of the third embodiment. FIG. 4 is a perspective view from the rear. The alarm device 1C has the same main configuration as the alarm device 1, is longer than the lamp grooves 15 and 16 in FIG. 8, and the shape of the lamp grooves 15 and 16 is also improved. As shown in FIGS. 9(a) to 9(c), the alarm device 1C emits light with a larger amount of light than that of the alarm device 1B shown in FIG. 8, and as shown in FIG. The light became more visible.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. can be appropriately made. In addition, the material, shape, size, numerical value, form, number, arrangement position, etc. of each constituent element in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved. For example, in the above example, the case where the present invention is applied to the alarm device 1 for issuing an alarm for gas leakage or the like has been described. However, when a fire occurs, the LED 40 and the lamp unit 13 sense heat to give an alarm. It may be provided in a fire alarm. In the above example, three LEDs 40 and three lamp grooves 15 and 16 are provided, but one, two, or four or more LEDs and lamp grooves may be provided.

Furthermore, in the above example, the tip of the LED 40 does not protrude from the hole 11a provided in the upper case 11, and the hole 11a functions as a light guiding section that guides the light from the LED 40. Not limited. As another aspect of the light guiding portion, the tip portion of the LED or other light source is projected from the hole 11a into the lamp grooves 15 and 16 (upper surface of the upper case 11), and the light source is disposed in the lamp grooves 15 and 16. The mode etc. which are carried out are considered.

Here, the features of the alarm device according to the embodiment of the present invention described above will be briefly summarized and listed below in [1] to [6].
[1] An alarm device (1) for issuing an alarm by emitting light when an abnormal state is detected,
A case (case body 10 (upper case 11)),
A light source (LED40) provided in the case,
The case is
An inclined surface or a curved surface (ramp groove 15, 16) provided in a part of the case,
A light guide portion (hole 11a) provided on the inclined surface or the curved surface for guiding light from the light source,
The sloping surface or the curved surface reflects the light emitted from the light deriving unit.
[2] The alarm device according to [1], wherein the case further includes a bridge (14) provided on an upper portion of the light guiding portion.
[3] The bridge has an inclined surface or a curved surface (bridge bottom surface 14a) facing the light source, and allows the light guided from the light guiding portion to pass through the inclined surface or the curved surface of the case and the outside of the case. The alarm device according to the above [2], wherein the alarm device reflects the light toward at least one of them.
[4] The alarm device according to the above [2] or [3], wherein the inclined surface or the curved surface of the case is provided on both sides of the bridge.
[5] In any one of [1] to [4] above, a tapered wall (first reflection wall 15b) wider than the light guiding portion is provided on the inclined surface or the curved surface of the case. The alarm device described.
[6] The case (upper case 11) has a circular shape,
The light source (LED40) is provided inside the case,
The inclined surface or the curved surface of the case is a part of the groove (lamp groove 15, 16) extending in the radial direction of the circle, which is recessed so that the part of the case is close to the end of the light source ( Bottom walls 15a, 16a),
The light guiding portion is a hole (11a) provided in the upper part of the light source in the part of the groove,
The bridge (14) is installed on the opening of the groove. The alarm device according to any one of the above [2] to [4].

1, 1A, 1B, 1C Alarm device 10 Case body 11 Upper case 11a Hole 12 Lower case 13 Lamp part 14 Bridge 14a Bridge bottom surface 14b Bridge side surface 15,16 Lamp groove 15a, 16a Bottom wall 15b, 16b First reflection wall 15c, 16c Second reflective walls 15d, 16d Peripheral wall 30 Printed circuit board 40 LED

Claims (6)

An alarm device that emits an alarm when an abnormal condition is detected,
A case,
A light source provided in the case,
The case is
An inclined surface or a curved surface provided on a part of the case,
A light guide portion that guides light from the light source, the light guide portion being provided on the inclined surface or the curved surface,
The sloping surface or the curved surface reflects the light emitted from the light deriving unit. The alarm device according to claim 1, wherein the case further includes a bridge provided on an upper portion of the light guiding portion. The bridge has an inclined surface or a curved surface facing the light source, and directs the light guided from the light guiding section toward at least one of the inclined surface or the curved surface of the case and the outside of the case. The alarm device according to claim 2, which is reflected. The alarm device according to claim 2 or 3, wherein the sloped surface or the curved surface of the case is provided on both sides of the bridge. The alarm device according to any one of claims 1 to 4, wherein a tapered wall that is wider than the light guiding portion is provided on the inclined surface or the curved surface of the case. The case has a circular shape,
The light source is provided inside the case,
The inclined surface or the curved surface of the case is a part of a groove extending in the radial direction of the circle, which is recessed so that the part of the case is close to the end of the light source,
The light guide portion is a hole provided in the upper part of the light source in the part of the groove,
The alarm device according to any one of claims 2 to 4, wherein the bridge is installed in an opening portion of the groove.