JP6440439B2 - Fire detector - Google Patents

Description

  The present invention relates to a fire detector having an indicator lamp, and more particularly to a technique effective when applied to a fire detector having a waterproof function.

In conventional fire detectors, an indicator lamp indicating that the detector is operating is generally provided at one location on the surface of the detector as disclosed in Patent Document 1, for example. It was. Fire detectors with one such indicator light have a problem in that the direction in which the display state can be confirmed is specified, and depending on the viewing direction, the indicator light cannot be seen and it is difficult to determine whether the detector is operating. there were.
In view of this, the present applicant has developed and acquired a patent for a fire detector in which lighting can be confirmed from any direction by causing the light emitting portion to shine in a ring shape (Patent Document 2).

Japanese Utility Model Publication No. 61-1511 Japanese Patent No. 5096549

The fire detector of the prior application patent described in Patent Document 2 did not consider the waterproof function. In developing a new fire detector with a ring-like light emitting part (light emitting part) described in Patent Document 2, the present inventors have examined the provision of a waterproof / dustproof function. It was.
When providing such a fire detector with a waterproof / dustproof function, it is common to provide a waterproof packing on the back side of the light emitting part, but with such a configuration, a dedicated waterproof packing that matches the shape of the light emitting part. This increases the cost and causes the waterproof packing to be seen through the transparent member constituting the light emitting portion. Therefore, it turned out that there exists a subject that the appearance of a light emission part worsens.

  Moreover, in the fire detector of Patent Document 2, since the rod-shaped light incident portion that guides light to the light emitting portion that shines in a ring shape penetrates the case, an O-ring is provided in the rod-shaped light incident portion. It was investigated. However, in such a configuration, a dedicated waterproof packing is not necessary, and thus an increase in cost can be avoided, but the O-ring of the light incident portion can still be seen through the transparent member, and the appearance of the light emitting portion is impaired. It turns out that there is a problem.

  The present invention has been made in view of the above problems, and in a fire detector having a light emitting part (light emitting part) that shines in a ring shape, it is possible to suppress an increase in cost and a decrease in the appearance of the light emitting part. It aims to provide a technology that can add waterproof and dustproof functions.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention provides:
A circuit board on which a circuit for detecting a fire is formed;
One or more light sources mounted or connected to the substrate;
A housing for housing the substrate and the light source;
In a fire detector comprising a light emitting unit that emits light on the surface side of the housing by light from the light source,
The casing has a dome-shaped main body case having an opening in the center and a space for storing the substrate and the light source therein, a back cover member attached to the main body case, and closing the opening. A transparent light transmissive window member,
The light emitting portion includes an annular light emitting portion disposed along an edge of the opening, one or more light introducing portions extending in a tangential direction of the annular light emitting portion, 1 or 2 or more rod-shaped light-incidence parts which inject the light from the said light source into each of 1 or 2 or more light introduction parts, and the coupling | bond part of the said light introduction part and the said light-incidence parts, and the said light incidence And a reflection part capable of reflecting the light from the part toward the light introduction part,
The main body case is formed with a through hole through which the light incident portion is inserted, and an O-ring capable of sealing a gap between the light incident portion and the through hole is inserted into the light incident portion. .

  According to the first aspect of the present invention, in a fire detector having a light emitting portion (light emitting portion) that shines in a ring shape, it can be waterproofed with a commercially available O-ring, and a dedicated waterproof packing is unnecessary. It is possible to realize waterproof and dustproof functions while keeping costs down. Further, since the waterproof O-ring is provided at a position shifted outward from the light emitting portion that shines in a ring shape, the waterproof O ring can be hidden by a pressing plate or the like, and the appearance of the light emitting portion is not deteriorated. Furthermore, since the light introduction part is extended in the tangential direction of the light emission part, the light from a light source can be efficiently introduced into the light emission part. In addition, when one light source, one light introduction part, and one light incident part are provided, although the light emission uniformity of the light emission part is inferior, the whole can be illuminated while reducing the number of parts. Further, by providing two or more light sources, light introducing parts, and light incident parts, the light emission uniformity of the light emitting part can be improved.

Preferably, the light emitting part is formed to have a rectangular or trapezoidal cross section, and the light introducing part has a rectangular or trapezoidal shape corresponding to the cross sectional shape of the light emitting part. Form.
According to such a configuration, since the light introducing portion has a shape corresponding to the cross-sectional shape of the light emitting portion, light incident from the light incident portion can be efficiently introduced into the light emitting portion.

Preferably, the light emitting portion is formed so that an outer peripheral surface thereof forms a polygon by a plurality of planes continuing at a predetermined angle.
As a result, the light introduced into the light emitting portion can be repeatedly reflected on the outer peripheral surface and traveled along the shape of the light emitting portion, so that the light can spread over the entire light emitting portion, thereby releasing the light. The uniformity of light emitted from the surface of the part can be improved.

Furthermore, it is desirable to provide a pressing plate that has an opening larger than the opening and smaller than the outer shape of the light emitting portion and is attached to the front surface of the main body case.
As a result, it is possible to prevent the O-ring inserted into the light introduction part from being hidden from view from the outside and to prevent the appearance of the light emitting part from deteriorating.

Preferably, the pressing plate has a screw hole in the vicinity of a portion corresponding to the through hole through which the light incident portion is inserted, and is configured to be attached to the front surface of the main body case with a screw.
According to such a configuration, the O-ring can be pressed and deformed via the pressing plate with a tightening force by a screw, and the sealing performance can be improved.

Further, preferably, the said end of the body case front side of the front Kinuki hole, a recess for accommodating the O-ring,
A flange portion is formed in the light incident portion, and the flange portion is configured to be able to contact the O-ring housed in the recess.
As a result, the rigidity of the contact portion of the light introducing portion with the O-ring can be increased, thereby coupling the light incident portion and the light introducing path, which are easily deformed by the reaction force or thermal stress from the O-ring. It is possible to prevent the deterioration of the performance of the reflecting portion while reducing the deformation of the portion.

  ADVANTAGE OF THE INVENTION According to this invention, in a fire detector provided with the light emission part (light emission part) which shines in a ring shape, a waterproof and dustproof function can be added, suppressing a cost increase and the appearance of a light emission part falling. There is an effect.

The fire detector as an example of this invention is shown, (A) is a top view, (B) is sectional drawing. FIGS. 2A and 2B show a light emitting unit constituting the fire detector of FIG. 1, in which FIG. 1A is a plan view of the light emitting unit, and FIG. It is sectional drawing which shows the structure and effect | action of the light-incidence part and reflection part of the light emission part of FIG. It is a partially expanded sectional view which shows the seal structure of the light-incidence part of the light emission part of FIG. It is a top view which shows the modification of the light emission part which comprises the fire detector of FIG. It is a perspective view which shows the 2nd modification of the fire detector of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a fire detector 10 according to an embodiment of the present invention. (A) is a plan view, (B) is a sectional view taken along line BB in (A), The fire detector 10 is installed on the ceiling surface of the building with the upper side (the top of the head) in FIG. 1B facing downward. In the following description, the terms “upper” and “lower” are used on the basis of the posture of FIG.

  As shown in FIG. 1B, the fire detector 10 of the present embodiment is joined to a dome-shaped main body case 11 and a back surface side opening of the main body case 11 so as to be closed. The main body back cover 12, the printed wiring board 13 housed in the main body case 11, the light transmission window 14 that closes the front opening of the main body case 11, the light emitting portion 15 that glows in a ring shape (annular), the light emitting portion 15 includes an opaque decorative plate 16 provided on the upper surface of the main body case 11 so as to surround 15. In the present embodiment, the light emitting unit does not emit light itself, but means that emits light indirectly by light introduced from an external light source.

In the printed wiring board 13, for example, three flame detecting elements 17 a, 17 b, 17 c and light emitting elements 18 such as light emitting diodes (LEDs) and elements constituting a fire detection judging circuit so as to face the light transmitting window 14. (Not shown) is implemented.
The reason why the central opening 11a of the body case 11 is elliptical is that three flame detection elements 17a, 17b, and 17c are mounted on the printed wiring board 13, and one flame detection element is mounted. In this case, it may be circular. The flame detection elements 17a, 17b, and 17c can be composed of an infrared detection element or a light detection element that detects light having a desired wavelength.

The body case 11 is formed with an elliptical opening 11a at the center, and a recess 11b that is one step lower than the upper surface is provided around the opening 11a. A sealing material 19 made of packing or adhesive is provided between the peripheral edge of the light transmission window 14 that closes the central opening 11 a of the main body case 11 and the inner wall surface of the main body case 11. The main body case 11 can be formed of a resin or a metal such as aluminum or stainless steel.
The light transmission window 14 is formed in a plate shape with a material that can transmit light. The light emitting portion 15 is formed of a transparent resin such as an acrylic resin as a whole. The light emitting portion 15 penetrates the ring-shaped light emitting portion 15 a and the upper wall of the main body case 11 and faces the light emitting element 18. It comprises an incident part 15b and a light introduction path 15c for introducing light incident from the light incident part 15b into the light emitting part 15a. A waterproof / dustproof O-ring 20 is inserted into the base of the light incident part 15b. Has been. As the O-ring 20, a commercially available standard can be used.

The cross section of the light emitting portion 15a may be a horizontally long rectangle or a trapezoidal shape having a tapered surface inside, and the upper surface may be a gently curved surface or a roof shape in which two flat surfaces are abutted.
The decorative plate 16 is shaped so that a part thereof overlaps the peripheral edge of the light emitting portion 15a of the light emitting portion 15, and is joined so as to straddle the surface of the light emitting portion 15a and the surface of the main body case 11. The light emitting unit 15 is configured to function as a pressing plate. The decorative plate 16 may be fixed with an adhesive, or may be coupled to the main body case 11 with locking claws formed on the inner peripheral edge thereof, or may be attached to the main body case 11 with screws as will be described later. .

FIG. 2 shows a detailed structure of the light emitting unit 15. Among these, (A) is a plan view and (B) is a partially enlarged perspective view.
As shown in FIG. 2A, the light emitting unit 15 in the fire detector of the present embodiment includes a light emitting unit 15a having an elliptical ring shape, and a light emitting unit extending in a tangential direction from the light emitting unit 15a. And a pair of light introduction paths 15c to be introduced into 15a. The lower surface of the light emitting portion 15 a is generally flat, and comes into wide contact with the upper surface of the main body case 11. Although it is conceivable to provide the light introduction path 15c so as to be orthogonal to the light emission part 15a instead of the tangential direction, in this case, there is a light introduction path 15c, the light emission part 15a, and a reflection part that changes the direction of light at the coupling site. Although necessary, by providing the light introduction path 15c so as to extend in the tangential direction of the light emitting portion 15a, the reflection portion can be made unnecessary.

  Further, as shown in FIGS. 2B and 3A, the light emitting unit 15 includes a rod-shaped light incident unit 15b facing the light emitting element 18 extending downward from the tip of the light introduction path 15c, A reflecting portion 15d having an inclination of about 45 degrees for reflecting light incident from the end face of the light incident portion 15b toward the light introduction path 15c, and a flange portion 15e provided in the vicinity of the reflecting portion 15d. . As shown in FIG. 3B, the light incident portion 15b is disposed so that the lower end surface thereof faces the light emitting element 18, and the light incident from the end surface is reflected toward the light introduction path 15c by the reflection portion 15d. Is done.

  On the surface of the light emitting portion 15a (including the exposed-side surface and the case-side surface), a large number of fine grooves (microstructure portions) that are fine hairline-like grooves are formed in a mesh shape. The light introduced into the light emitting portion 15a is reflected in various directions by these narrow grooves, and emits light so that the whole emits light almost uniformly. Instead of the groove, the protrusion may be formed in a hairline shape. Instead of providing a fine structure including a fine groove or protrusion on the surface of the light emitting portion, fine particles that diffusely reflect light may be mixed inside the light incident portion.

  Further, in the present embodiment, although not particularly limited, the light introduction path 15c is formed so that the cross section has a rectangular shape, and the reflection portion 15d has a rectangular shape corresponding to the cross sectional shape of the light introduction path 15c. It is formed to make. Thereby, the light incident from the light incident portion 15b can be efficiently introduced into the light emitting portion 15a having the same rectangular shape. When the cross-sectional shape of the light emitting portion 15a is trapezoidal, the cross-sectional shape of the light introduction path 15c may be trapezoidal correspondingly. Even when the light emitting portion 15a has a trapezoidal cross section, the light introduction path 15c may have a rectangular cross section.

  In the present embodiment, by providing the flange portion 15e, the O-ring 20 engaged with the outer periphery of the light incident portion 15b is interposed between the flange portion 15e and the main body case 11 as shown in FIG. The sealing property can be enhanced by sandwiching and deforming. Further, by providing the flange portion 15e, the rigidity of the contact portion of the light introduction path 15c with the O-ring 20 can be increased, and thereby the repulsive force and thermal stress from the O-ring 20 act to easily deform. It is possible to prevent deterioration of the performance of the reflecting portion 15d while reducing deformation of the coupling portion between the light incident portion 15b and the light introduction path 15c.

  Further, in the present embodiment, a through hole 11c through which the light incident portion 15b is inserted is provided in the main body case 11, and an accommodation recess 15d of the O-ring 20 is formed in the upper portion of the through hole 11c. The storage recess 15d is formed to be slightly shallower than the diameter of the O-ring 20, whereby the O-ring 20 sandwiched between the flange portion 15e and the main body case 11 is pressed and deformed to emit light. The lower surface of the light emitting portion 15 a forming the ring shape of the portion 15 is in contact with the upper surface of the main body case 11 so that no gap is generated.

Next, a modified example of the fire detector of the above embodiment will be described.
As shown in FIG. 5 (A), the first modification is provided with a plurality of planes that form a predetermined angle on the outer peripheral surface of the light emitting portion 15a that forms a ring shape that constitutes the light emitting portion 15. By forming the outer shape to be a polygon (for example, an octagon) in plan view, as shown in FIG. 5B, the light introduced into the light emitting portion 15a by the light introduction path 15c is transmitted on the outer peripheral surface. The reflection is repeated and proceeds along the shape of the light emitting portion 15a so that the light spreads over the entire light emitting portion 15a.
By adopting such a configuration, it is possible to improve the uniformity of light emitted from the surface of the light emitting portion 15a as compared to the case where it is not adopted.

As shown in FIG. 6, in the second modification, a decorative plate 16 that is provided on the front surface side of the light emitting unit 15 and functions as a pressing plate that holds the light emitting unit 15 so as not to come out of the main body case 11 is provided with screws 21, 21. It is comprised so that it may fix to the main body case 11. In this way, by fixing the decorative plate 16 to the main body case 11 with the screws 21 and 21, inspection and repair can be easily performed as compared with the method of fixing with the adhesive.
Further, in this modification, the position of the screw hole 11d on the front surface of the main body case 11 through which the screws 21 and 21 are inserted is set in the vicinity of the through hole 11d through which the light introduction path 15c constituting the light emitting unit 15 is inserted. ing. Accordingly, there is an advantage that the sealing performance of the O-ring 20 can be improved by increasing the force for clamping the O-ring 20 as compared with the case where the screw is fixed at a position away from the through hole 11d.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments and can be appropriately changed without departing from the gist of the invention. For example, in the above-described embodiment, the light emitting portion 15a of the light emitting portion 15 is shown in an elliptical shape, but may be formed in a circular shape, an oval shape, a polygonal shape, or the like as long as it is annular. Furthermore, the number of the light incident portions 15b is not limited to two, and three or more light incident portions 15b may be provided.
Further, the light emitting unit of the present invention is not necessarily composed of one member as described in the above embodiment, and may be configured by combining a plurality of components.

  Furthermore, a coating material that functions as a light reflecting material is applied to the contact surface with the light emitting unit 15 of the main body case 11 or the inclined surface of the reflecting unit 15d, or a metal foil or a metal film is applied or formed (evaporated). May be. In the embodiment, the light emitting element 18 is mounted on the printed wiring board 13. However, the light emitting element 18 is disposed at a position away from the printed wiring board 13, and a circuit on the printed wiring board 13 is formed by a lead wire or the like. It is good also as a structure connected to. The light emitting element 18 is not limited to an LED (light emitting diode) but may be a lamp or the like.

DESCRIPTION OF SYMBOLS 10 Fire detector 11 Main body case 12 Main body back cover 13 Printed wiring board 14 Light transmission window 15 Light emission part 15a Light emission part 15b Light incident part 15c Light introduction part 15d Reflection part 15e Flange part 16 Decorative plate (holding plate)
17 Flame detecting element 18 Light emitting element 19 Sealing material 20 O-ring

Claims (6)

A circuit board on which a circuit for detecting a fire is formed;
Two or more light sources mounted or connected to the substrate;
A housing for housing the substrate and the light source;
In a fire detector comprising a light emitting unit that emits light on the surface side of the housing by light from the light source,
The casing has a dome-shaped main body case having an opening in the center and a space for storing the substrate and the light source therein, a back cover member attached to the main body case, and closing the opening. A transparent light transmissive window member,
The light emitting portion includes an annular light emitting portion disposed along an edge of the opening, one or more light introducing portions extending in a tangential direction of the annular light emitting portion, 1 or 2 or more rod-shaped light-incidence parts which inject the light from the said light source into each of 1 or 2 or more light introduction parts, and the coupling | bond part of the said light introduction part and the said light-incidence parts, and the said light incidence And a reflection part capable of reflecting the light from the part toward the light introduction part,
The main body case is formed with a through hole through which the light incident portion is inserted, and an O-ring capable of sealing a gap between the light incident portion and the through hole is fitted into the main body case. Fire detector. The light emitting part is formed so that the cross section is rectangular or trapezoidal,
2. The fire detector according to claim 1, wherein the light introducing portion is formed to have a rectangular or trapezoidal cross section corresponding to a cross sectional shape of the light emitting portion.   3. The fire detection according to claim 1, wherein the light emitting portion is formed so that an outer peripheral surface thereof forms a polygon by a plurality of planes continuing at a predetermined angle. 4. vessel.   The fire according to any one of claims 1 to 3, further comprising a pressing plate that has an opening that is larger than the opening and smaller than the outer shape of the light emitting portion and is attached to the front surface of the main body case. sensor.   The said holding | maintenance board has a screw hole in the vicinity of the site | part corresponding to the through-hole by which the said light-incidence part is penetrated, It mounts | wears with the front surface of the said main body case with a screw. Fire detector. The said end of the body case front side of the front Kinuki hole, recess for accommodating the O-ring is provided,
The fire detector according to claim 5, wherein a flange portion is formed in the light incident portion, and the flange portion is configured to be able to contact the O-ring accommodated in the recess.

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