JP3338610B2 - Fire detector with confirmation light - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector with a confirming light, and more particularly, to a thin, simple structure, which can be mounted at a position where the confirming light is easy to see, and the confirming light is bright and the visibility is further improved. About fire detectors with confirmation lights.

[0002]

2. Description of the Related Art Conventionally, various fire detectors have been proposed, and the fire detector is usually provided with a confirmation light for displaying an operation state when an alarm occurs. This confirmation light is used not only to check which fire detector is emitting when the fire detector emits an alarm, but also during an operation test such as a smoke test or heating test. It is also used to check whether the fire detector operates normally.

FIG. 7, 8 or 9 is a view schematically showing an example of a conventional fire detector with a confirmation light. The fire detector B shown in FIG. 7 is a confirmation light 10 composed of a light emitting element such as an LED.
1, a base portion 102 attached to a ceiling or the like, a head body 103 integrally formed so as to have a concave portion 103a at the center, and a sensor such as a smoke sensor and / or a temperature sensor provided at a central portion of the head body 103. (Not shown) and an electric circuit device (not shown) which is housed in the recess 103a of the head body 103 and operates the confirmation lamp 101 and a sensor (not shown) are provided. Circuit board 105. Then, the fire detector 1 of the head body 103
A hole 103c is formed in the lower side
Is provided, and the confirmation light 101 is
Mounted inside.

The fire detector C shown in FIG. 8 has a lower top surface S1 of the head body 103 than the fire detector B.
A hole 103c is provided on the outer peripheral side of the hole 03a.
03c. In this fire detector C, the head body 103 includes an upper head body portion 103x and a lower head body portion 103, as shown in the figure.
y, a so-called two-piece structure. And
In the fire detector C, the confirmation light 101 is set to the fire detector G
, The lower top surface S103a of the head body 103
Since a large circuit board must be used as the circuit board 105a on which the electric circuit device (not shown) is provided, the circuit board 105a is not provided in the recess 103a of the head body 103. Are housed in the head body 103.

[0005] In the fire detector D shown in FIG. 9, a light emitting element is used as a confirmation lamp 101, and a base 102
A protrusion 107 having a hole 107c is provided on the outer peripheral side surface S102b of the
c. In this fire detector D, a confirmation light 101 and an electric light for operating the confirmation light 101 are separately provided from a circuit board 105b provided with an electric circuit device (not shown) for operating a sensor (not shown). The configuration includes a circuit board 110 provided with a circuit device (not shown).

In the conventional fire detectors B, C and D,
In each case, a light emitting element such as an LED used as the confirmation light 101 has circuit boards 105, 105a,
S110b, S105b, S110
b is attached substantially vertically downward. 7, 8 or 9, reference numerals 121 and 121 denote blades, and the fire detector is generally provided with the blades (121, 121) provided on the head body 103 side (not shown). ), The head body 103 is attached to the base 102.
At the same time, the fire detector and the fire alarm are electrically connected.

Incidentally, a fire detector B as shown in FIG.
Uses an integrally molded product as the head body 103 and a small circuit board 105 that can be accommodated in the recess 103a of the head body 103, so that the manufacturing cost of the fire detector B can be kept low. Although there is an advantage that the confirmation light 101 is provided on the circuit board 105, the position of the confirmation light 101 is very close to the fire detection unit 104. For this reason,
When performing an operation test, such as a smoke test or a heating test, to determine whether or not the fire detector B operates normally, a ring test having a cylindrical tube 10a as shown by an imaginary line in FIG. When the detector 10 is installed below the fire detector B, the confirmation light 101
But enters the cylindrical body 10a of the burning tester 10,
There is a problem that the tester of the fire detector B cannot see the confirmation light 101.

In such a case, the tester or the like uses
Since it is checked whether or not the confirmation light 101 of the fire detector B is normally lit by tilting 0, there is a problem that the operation test takes time, and tilting the opening tester 10 causes an operation. There is a problem that the accuracy of the test is deteriorated. On the other hand, the fire detector C as shown in FIG.
01 is provided on the outer peripheral side of the head body 103. Therefore, even if the burning tester 10 is installed under the fire detector H, the confirmation light 101 is located outside the cylinder 10a of the burning tester 10. Therefore, there is an advantage that a tester or the like can easily confirm whether or not the confirmation lamp 101 normally lights without tilting the blow tester 10 during an operation test. Since a large-sized board must be used, the manufacturing cost of the circuit board 105a provided with the electric circuit device (not shown) increases, and the circuit board 105a is large. Since the circuit board 105a must be accommodated in the head body 103 having such a two-piece structure, the structure of the fire detector C becomes complicated and the manufacturing cost increases. There is a problem.

A fire detector D as shown in FIG.
Since the confirmation light 101 is provided in the protruding portion 107 provided so as to protrude from the outer peripheral side surface of the base portion 102, even if the burning tester 10 is installed below the fire detector D, the confirmation light 10 is provided.
1 is located outside the cylindrical body 10a of the burning tester 10, so that the tester can easily confirm whether or not the confirmation lamp 101 of the fire detector D normally lights up during the operation test. However, apart from the circuit board 105b provided with an electric circuit device (not shown) for operating the sensor,
Confirmation light 101 and circuit board 1 for operating confirmation light 101
In this case, there is a problem that the structure of the fire detector D is complicated and the manufacturing cost is increased.

In the conventional fire detectors B, C and D,
In each case, as shown in the figure, the light emitting element used as the confirmation light 101 is attached substantially vertically downward to the lower surfaces S105b, S105ab, and S110b of the circuit boards 105, 105a, and 110. The degree of freedom is limited, and the fire detector cannot be made thinner, which also causes an increase in manufacturing cost.

Further, in the conventional fire detectors B, C, and D, when the head body 103 is attached to the base portion 102, the blades 121 of the base portion 102 are attached to the blades 121 of the head body 103 (not shown). Even if the fire detectors B, C, and D are not completely fitted, if the fire detectors B, C, and D are normal, if the operation test is performed, the confirmation lamp 101 is turned on. There was a problem that an installer or the like could not confirm whether or not the plug blade (not shown) of the head body 103 was completely fitted to the plug blades 121 of the base portion 102.

As a reference example of interest to the present invention, the present inventors have proposed that an electric circuit device (not shown) for operating a sensor or the like can be accommodated in a fire detecting section in order to solve the above-mentioned problems. Using a small single board, it is easy for the tester to visually check the presence or absence of the confirmation lamp during the operation test, and whether the head body is completely attached to the base part. A fire detector with a confirming light, which can easily confirm whether the fire detector has a simple structure and can be manufactured at a low cost, has been proposed (Japanese Patent Application No. Hei 7 (1999)).
-279426).

FIG. 10 is a view schematically showing an example of a fire detector with a confirmation light described in Japanese Patent Application No. 7-279426, and FIG. 10 (a) is an exploded perspective view showing the appearance. FIG. 10B is a cross-sectional view. The fire detector E with a confirmation light includes a light emitting element 101 such as an LED, a base 102 mounted on a ceiling or the like, a head body 103 detachably provided on the base 102, and a head body 10
3 is provided in the center of the fire detecting unit 10 and accommodates sensors (not shown) such as a smoke sensor and / or a temperature sensor.
4, a light emitting element 101, a circuit board 105 provided with an electric circuit device (not shown) for operating the light emitting element 101 and a sensor (not shown), and a light conducting member 106. I have.

The head body 103 is integrally formed so as to have a recess 103a at the center thereof.
A circuit board 105 is housed in a space formed by the fire detector 3a and the fire detecting unit 104. Further, the vicinity of the outer peripheral side surface S103b of the head body 103, more specifically, the lower top surface S103a connected to the fire detecting unit 104
A hole 103c is formed at a corner portion between the lower side top surface S103a and the outer peripheral side surface S103b provided so as to rise upward from the outer periphery of the lower side top surface S103a.

The light emitting element 101 is mounted so as to lie substantially parallel to the upper surface S105a of the circuit board 105 as shown in the figure. Then, the light conducting member 106
Is provided close to the side of the light emitting element 101 so that one end 106a is optically connected to the light emitting element 101, and is inserted through a hole 104c provided in the fire detecting unit 104; 106b is provided in the hole 103c of the head body 103.

In this example, the other end 106b is
The protrusion 106d is provided inside the hole 103c so as to form 6d, and the projection 106d can efficiently irradiate the light transmitted through the light conducting member 106 to the lower side of the fire detector E. As described above, the surface S106 is provided on the lower side. In the fire detector E, when the fire detector E issues a warning during an operation test such as a fire or a smoke test or a heating test, first, the light emitting element 101 is turned on. The light emitted from the light emitting element 101 enters the light conducting member 106 from one end 106a of the light conducting member 106, passes through the light conducting member 106, and is provided near the outer peripheral side surface S103b of the head body 103. Other end 106 provided in the hole 103c
b is radiated from the lower surface S106 of the protruding portion 106d in four downward circumferential directions.

With the above configuration, this fire detector E
It has the following excellent effects. Light emitted from the light emitting element 101 provided on the circuit board 105 is transmitted to the light conducting member 10.
6, the outer peripheral side surface S103 of the head body 103 is used.
b to the other end 106b of the light conducting member 106 provided in the hole 103c provided near the light conducting member 1b.
Since the other end 106b of the light emitting member 106 is used as a confirming light, even if an operation test is performed using the burning tester 10, the light conducting member 106 used as a confirming light is provided outside the cylindrical body 10a of the burning tester 10. Since the end 106b is located, the tester or the like can easily check whether or not the other end 106b is lit without tilting the roasting tester 10.
Inspection work is facilitated, and the operation test can be performed without tilting the bleeding tester 10, so that the accuracy of the operation test is increased.

The light emitting element 101 is connected to a circuit board 105.
Since it is provided above, there is no need to use a large substrate as the circuit board 105; Equipment (not shown)
Of the head body 10 as a circuit board 105 provided with
Since a small one that can be accommodated in the third recess 103a can be used, the manufacturing cost of the circuit board 105 provided with an electric circuit device (not shown) can be reduced.

Since a small circuit board 105 on which an electric circuit device (not shown) is provided can be used, it is necessary to use a two-piece head body 103 as shown in FIG. 7 as the head body. And the use of the integrally formed head body 103 having the concave portion 3a for accommodating the circuit board 105 at the center, the number of parts of the fire detector E can be reduced, and the manufacturing cost of the fire detector E can be reduced. Can be held down.

Further, since only one circuit board 105 provided with the electric circuit device is required, the manufacturing cost of the fire detector E can be kept low. In this fire detector E, the light emitting element 101 is substantially parallel to the upper surface S105a of the circuit board 105 on which the electric circuit device (not shown) for operating the light emitting element 101 and the sensor (not shown) is provided. Since the fire detector E is provided so as to lie down, the fire detector E can be made thinner, so that the degree of freedom in the design of the fire detector E is not restricted, and there is an excellent effect that the manufacturing cost can be reduced. .

[0021]

However, the above-mentioned fire detector E has a problem that the end 106b of the photoconductive member used as a confirmation light is not sufficiently bright.
The present inventors studied the cause of the other end 106b of the light conducting member 106 used as a confirmation light of the fire detector E not being so bright, and found that the shape of the light conducting member 106 used in the conventional fire detector E was Came to know that

FIG. 11 is a schematic sectional view showing the shape of the light conducting member 106 in an enlarged manner. Conventional light conducting member 10
In FIG. 6, since one end 106a is flat,
As shown in FIG. 1A, a light beam emitted from a light-emitting body (light source) a inside the light-emitting element 101 in the front direction is, as intended, one end 10.
6a, the light enters the light conducting member 106, and the light conducting member 1
06, the light is reflected by the reflection surface M106 and radiated downward from the other end 106b. Light rays in a direction deviated from the front direction with respect to the light-emitting body (light source) a inside the light-emitting element 101 are shown in FIG. As shown in FIG.
06, and is not radiated downward from the other end 106b.

With the shape of the light conducting member 106 shown in FIG. 11, it was found that about half or more of the amount of light incident from one end 106a was not emitted from the other end 106b. To easily solve such a problem, the thickness I of the light conducting member 106 may be increased or the curved surface of the other end 106b may be eliminated.
The former contradicts the thinning of the sensor, and the latter undesirably impairs the design aesthetics of the sensor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is thin, has a good design, can keep the manufacturing cost low, and has the visibility of the confirmation lamp when inspecting the fire detector. Another object of the present invention is to provide a fire detector with a confirmation light, which is excellent in that the confirmation light is bright and the visibility of the confirmation light is further improved when inspecting the fire detector.

[0025]

According to a first aspect of the present invention, there is provided a fire detector with a confirmation light, which is detachably provided on a light emitting element, a base, and a base. An integrally molded head body having a hole in the vicinity, a fire detection unit provided in the center of the head body and containing a sensor, and housed in a space formed by the recess and the fire detection unit of the head body A light emitting element, a circuit board provided with an electric circuit device for operating the light emitting element and the sensor, and a light conducting member, the light conducting member, one end of which is optically connected to the light emitting element, And it has a curved surface protruding in the light emitting element direction, the other end is provided in a hole provided near the outer peripheral side surface of the head body,
The other end of the light conducting member is used as a confirmation lamp.

In the fire detector with a confirmation light according to claim 1, one end of the light conducting member on the side optically connected to the light emitting element has a curved surface projecting in the direction of the light emitting element. The light emitted from the light conducting member is corrected into a substantially parallel light component along the light conducting member direction in the light conducting member, so that more light beams can be emitted from the other end of the light conducting member.

[0027] In the fire detector with a confirmation light according to the second aspect, one end of the light conducting member that is optically connected to the light emitting element emits the curvature of a curved surface projecting in the direction of the light emitting element from the light emitting element. Specifically, the curvature of a curved surface for correcting the light to be converted into a substantially parallel light component along the direction of the light conducting member in the light conducting member is specifically defined. That is, in the fire detector with the confirmation light according to claim 2, the curvature of the curved surface provided at one end of the light conducting member of the fire detector with the confirmation light according to claim 1 satisfies the following relationship.

R = f · (n−1) r is the curvature of a curved surface provided at one end of the light conducting member, and
Denotes a distance from an apparent light emitting position of the light emitting element to one end of the light conducting member, and n denotes a refractive index of the light conducting member. The fire detector with a confirmation light according to claim 3 is a light detector with a confirmation light according to claim 1 or 2, wherein light is transmitted from one end to the other end of the light conduction member in the light conduction member. By changing the reflection angle, the direction of light passing through the light conducting member
In order to make them substantially parallel, a portion not parallel to the outer shape of the light conducting member was provided.

In the fire detector with the confirmation light according to the third aspect, the reflection angle of the light in the light conducting member is changed between one end and the other end of the light conducting member, and the light passing through the light conducting member is changed. In order to make the direction substantially parallel, by providing a portion that is not parallel to the outer shape of the light conducting member, light components that are totally reflected within the light conducting member and are not emitted from the other end are reduced,
The other end becomes brighter when the light emitting element is turned on.

According to a fourth aspect of the present invention, there is provided a fire detector with a confirmation light according to any one of the first to third aspects, wherein the light conducting member of the fire detector with the confirmation light according to any one of the first to third aspects has the other end directed substantially vertically downward. In the vicinity of the other end, there is provided a reflecting surface which is bent at approximately 45 ° with respect to the vertical direction, and the reflecting surface is made as close to the light emitting element side as possible to increase its area.

In the fire detector with the confirmation light according to the fourth aspect, the angle of the reflection surface of the light conducting member is set to a direction in which light is easily emitted from the other end which is directed downward in the substantially vertical direction. Since the area of the reflection surface is increased, the other end becomes bright when the light emitting element is turned on. In the fire detector with a confirmation light according to claim 5, the surface at the other end of the light conducting member of the fire detector with a confirmation light according to any one of claims 1 to 4 is a light scattering surface.

In the fire detector with the confirmation light according to the fifth aspect, the surface of the other end of the light conducting member is a light scattering surface, so that when the light emitting element is turned on, the other end shines whitish. Confirmation is easy. A fire detector with a confirmation light according to claim 6 is the light conducting member when the head body of the fire detector with a confirmation light according to any one of claims 1 to 5 is completely fitted to the base portion. Is optically connected to the light emitting element.

In the fire detector with the confirmation light according to the sixth aspect, if the head body is not completely fitted to the base portion,
Since one end of the light conducting member is not optically connected to the light emitting element, the installer or the like performs an operation test after attaching the fire detector, and if the other end of the light conducting member used as a confirmation light does not light up. It can be easily known whether the fire detector does not operate normally or the head body is not completely fitted to the base portion.

A fire detector with a confirmation light according to a seventh aspect uses the fire detector with a confirmation light according to any one of the first to sixth aspects as a smoke detector with a confirmation light.
The sensor is a smoke sensor. The smoke sensor may be a light scattering type smoke sensor or a light attenuation type smoke sensor.

An eighth aspect of the present invention provides a fire detector with a confirmation light, wherein the fire detector with a confirmation light according to any one of the first to sixth aspects is used as a heat detector.
It is a heat sensor.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail based on embodiments of the present invention. (First Embodiment of the Invention) FIG. 1 is a schematic sectional view mainly showing a light conducting member which is a main part of a fire detector with a confirmation light according to the present invention, and FIG. It is a figure which shows roughly the fire detector with a confirmation light, FIG.2 (a) is an exploded perspective view which shows an external appearance, FIG.2 (b) is sectional drawing.

The fire detector A with a confirmation light includes a light emitting element 1 such as an LED and a base 2 mounted on a ceiling or the like.
And a head body 3 detachably provided on the base portion 2
And a fire detection unit 4 provided at the center of the head body 3 and containing sensors (not shown) such as a smoke sensor and / or a temperature sensor, the light emitting element 1, the light emitting element 1, and the sensor (not shown). And a photoconductive member 6 provided with a circuit board 5 on which an electric circuit device (not shown) for operating the same is operated.

The head body 3 has a recess 3a at the center thereof.
The circuit board 5 is housed in a space formed by the concave portion 3a and the fire detecting portion 4. Further, the outer peripheral side surface S3b of the head body 3
, More specifically, a lower top surface S103a connected to the fire detection unit 4, and an outer peripheral side surface S103b provided to rise upward from the outer periphery of the lower top surface S103a.
A hole 103c is formed in the corner of the above.

The light-emitting element 1 is mounted so as to lie substantially parallel to the upper surface S5a of the circuit board 5, as shown in the figure. The light conducting member 6 has one end 6a.
Is provided close to the side of the light emitting element 101 so as to be optically connected to the light emitting element 1, and is inserted through a hole 4c provided in the fire detecting section 4, and the other end 6b is connected to the head body. 3 is provided in the hole 3c.

The material of the light conducting member 6 is not particularly limited as long as it is a material having a high light transmittance. Examples of such a material include acrylic resin and glass material. An optical fiber may be used as the light conducting member 6 (the same applies to the following embodiments of the invention). The shape of the light conducting member 6 is not particularly limited as long as the light irradiated from the light emitting element 1 can be efficiently guided to the other end 6b of the light conducting member 6, and the cross section is square. And a round bar having a circular section (the same applies to the following embodiments of the invention).

FIG. 3 is a schematic diagram showing a state in which the head body 3 and the base 2 are fitted. FIG. 3A shows a state in which the plug blade 22 and the base 2 provided in the head body 3 are connected to each other. FIG. 3B shows a state in which the provided blade 21 is completely fitted with the provided blade 21.
FIG. 4 is a view showing a state in which fitting between the blade 2 and the blade 21 provided on the base portion 2 is insufficient.

As is apparent from FIG. 3, in this fire detector B, the blade 21 on the base part 2 side and the blade (22 shown by imaginary lines) provided on the head body 3 side are completely formed. ,
When fitted, light emitting element (light emitting element 1 shown by imaginary line)
The base 21 is provided with the blade 21 and the light conducting member 6, the head body 3 is provided with the blade 22 and the light emitting element 1, so that an optical connection with the one end 6 a of the light conducting member 6 is made. Each is provided.

In this example, the other end 6b is provided in the hole 3c so as to form the projection 6d.
Transmits the light transmitted through the light conducting member 6 to the fire detector A.
Has a surface S6 on the lower side so that the light can be efficiently irradiated on the lower side of. This fire detector A with a confirmation light is particularly characterized in that a curved surface R6a is optically connected to the light emitting element 1 and provided at one end 6a of the light conducting member 6.

The light emitted from the light emitting element 1 is corrected to a component (parallel light) along the direction of the light conducting member 6 by the curved surface R6a. FIG. 4 is a diagram for explaining a method of defining the curvature of the curved surface R6a. In FIG. 4, a is the light emitting element (light source) of the light emitting element 1, r 1 is the curvature of the light emitting element 1, b is the apparent light emitting position of the light emitting element (light source) a, and n 1 is the light emitting element 1, the refractive index of the resin portion, r is the curvature of the curved surface R6a of one end 6a of the light conducting member 6, n is the refractive index of the light conducting member 6, and D1 is the light emitting element (light source) a to the light emitting element. D2 is the distance from the apparent light emission position b to the tip of the light emitting element 1, and f is
The respective focal lengths of the light emitting elements 1 are shown.

Here, the focal length f of the light emitting element 1 is expressed by the following equation. f = r1 / (n1-1)... Also, n / D1 = N / D2 + 1 / f.
Here, N indicates the refractive index of air. From the above, D2 = n1 / (n1 / D1- (n1-1) / r1) is obtained.

In order to make the light shining at the apparent light emitting position b into parallel light in the light conducting member 6, the curved surface R6a of one end 6a of the light conducting member 6 needs to have a curvature r shown below. f = r / (n−1) Therefore, r = f · (n−1), and r can be calculated.

In the fire detector A, when the fire detector A issues an alarm during a fire, an operation test such as a smoke test or a heating test, the light emitting element 1 is first turned on. Then, the light emitted from the light emitting element 1 enters the light conducting member 6 from one end 6 a of the light conducting member 6 and passes through the inside of the light conducting member 6.
Radiation is radiated downward from a surface S6 below the protrusion 6d of the other end 6b provided in the hole 3c provided near the outer peripheral side surface S3b of the head body 3.

Further, in the fire detector A, one end 6a of the light conducting member 6 on the side optically connected to the light emitting element 1 is provided.
Since the curved surface R6a projecting in the direction of the light emitting element 1 has a predetermined curvature r, the light emitted from the light emitting element 1 is corrected into a component (parallel light) along the light conducting member 6 in the light conducting member 6. Thus, more light can be emitted from the other end 6b of the light conducting member 6.

Therefore, as compared with the conventional fire detector E,
When the light emitting element 1 is turned on, the other end 6b of the light conducting member 6 used as a confirmation lamp is bright. In the following embodiments of the invention,
Since the configuration is the same as that of the fire detector A except that the shape of the light conducting member 6 is different, the shape of the light conducting member will be mainly described. (Embodiment 2) FIG. 5 is a view schematically showing another example of a fire detector with a confirmation light according to the present invention, centering on a light conducting member.

The light conducting member 61 has the same shape as the light conducting member 6 shown in FIG. 1 except for the following points.
Corresponding members are denoted by corresponding reference numerals,
The description is omitted. This light conducting member 61 changes the reflection angle of light in the light conducting member 61 between one end 6a and the other end 6b on the side optically connected to the light emitting element 1,
In order to make the direction of light passing through the light conducting member 61 substantially parallel, portions that are not parallel to each other are provided on the outer shape of the light conducting member.

More specifically, in this example, a side surface Wb facing the side surface Wa of the light conducting member 61 is formed in the region P by the side surface W.
a from the one end 6a to the other end 6b so that the distance is gradually widened so that the light is not parallel to the side surface Wa and the side surface W.
b, as the reflection is repeated, the incident angle and the reflection angle are gradually increased so that the light transmitted through the light conducting member 61 becomes substantially parallel light along the light conducting member 61.
It is provided so as to have a predetermined inclination. (Embodiment 3) FIG. 6 is a view schematically showing another example of a fire detector with a confirmation light according to the present invention, centering on a light conducting member.

The light conducting member 62 has the same shape as the light conducting member 6 shown in FIG. 1 except for the following points.
Corresponding members are denoted by corresponding reference numerals,
The description is omitted. In the light conducting member 62, the other end 6b of the light conducting member 62 is oriented substantially vertically downward (in the direction indicated by an arrow in the drawing), and is substantially vertically oriented near the other end 6b. On the other hand, it has a reflecting surface M62 bent at approximately 45 °. In this example, the reflecting surface M62 is provided so as to be close to the light emitting element 1 while maintaining the angle of the reflecting surface M62 so that the area of the reflecting surface M62 is as large as possible.

In the fire detector with the confirmation light using the light conducting member 62, light is emitted from the other end 6b of the light conducting member 62, the other end 6b of which the reflecting surface M62 is directed downward substantially in the vertical direction. Since the direction of the light-emitting element 1 is defined and the area of the reflection surface M62 is increased, the other end 6b of the light-emitting element 1 at the time of lighting is brightened. Although not shown, in order to obtain a light scattering effect on the surface of the other end 6b of the light conducting members 6, 61 and 62, so-called graining is performed to make the surface of the other end 6b a light scattering surface. Is also good.

As described above, if the light scattering effect is obtained on the surface of the other end 6b, when the light emitting element 1 is turned on, the other end 6b shines whitish, so that the confirmation lamp can be easily checked. The fire detector with a confirmation light according to the present invention has a simple structure, and can easily confirm whether or not the confirmation light is lit during an operation test, and can be manufactured at low cost. It can be suitably used as a fire detector.

[0055]

According to the fire detector with the confirmation light according to the first aspect of the present invention, one end of the light conducting member on the side optically connected to the light emitting element has a curved surface projecting in the direction of the light emitting element. The light emitted from the light emitting element is modified into a substantially parallel light component along the light conducting member in the light conducting member, so that more light can be emitted from the other end of the light conducting member.

Therefore, when the fire detector is inspected, the confirmation light is bright, and when the fire detector is inspected, the visibility of the confirmation light is further improved. In the fire detector with the confirmation light according to claim 2, one end of the light conducting member of the fire detector with the confirmation light according to claim 1 which is optically connected to the light emitting element projects in the direction of the light emitting element. Since the curvature of the curved surface to be provided is such that light emitted from the light emitting element is corrected in the light conducting member to be substantially parallel light in the direction of the light conducting member, thereby more light rays are emitted from the other end of the light conducting member. The fire detector with a confirmation light according to claim 3 can emit radiation.
Or, between one end and the other end of the light conducting member of the fire detector with the confirmation light according to 2, changes the reflection angle of light in the light conducting member, and makes the direction of light passing through the light conducting member substantially parallel. By providing a portion that is not parallel to the outer shape of the light conducting member, light components that are totally reflected within the light conducting member and are not emitted from the other end are reduced, so that the other end when the light emitting element is turned on becomes brighter. Become.

In the fire detector with the confirmation light according to the fourth aspect, the angle of the reflection surface of the light conducting member is set to a direction in which light is more likely to be emitted from the other end which is directed downward substantially in the vertical direction. Since the area of the reflection surface is increased, the other end of the light emitting element at the time of lighting is bright. In the fire detector with the confirmation light according to claim 5, the surface of the other end of the light conducting member is a light scattering surface, so that when the light emitting element is turned on, the other end shines whitish, so that the confirmation of the confirmation light can be performed. Easy to do.

In the fire detector with the confirmation light according to the sixth aspect, if the head body is not completely fitted to the base,
Since one end of the light conducting member is not optically connected to the light emitting element, the installer or the like performs an operation test after attaching the fire detector, and if the other end of the light conducting member used as a confirmation light does not light up. It can be easily known whether the fire detector does not operate normally or the head body is not completely fitted to the base portion.

In the fire detector with a confirmation light according to the present invention, light emitted from the light emitting element provided on the circuit board is provided near the outer peripheral side surface of the head body by using a light conducting member. Since the other end of the light conducting member is guided to the other end of the light conducting member provided in the hole provided and the other end of the light conducting member is used as a confirmation light, even if an operation test is performed using a Since the other end of the light conducting member used as the confirmation light is located outside the cylindrical body, the tester or the like can easily check whether or not the other end is lit without tilting the blow tester. This makes inspection work easier,
Since the operation test can be performed without tilting the roasting tester, the accuracy of the operation test is improved.

Further, since the light-emitting element is provided on the circuit board, it is not necessary to use a large substrate as the circuit board. As a circuit board provided with an electric circuit device (not shown) for operating the electric circuit device (not shown), a small circuit board that can be accommodated in the recess of the head body can be used. The manufacturing cost of the obtained circuit board can be kept low.

Further, since a small circuit board on which an electric circuit device (not shown) is provided can be used, it is not necessary to use a two-piece head body as the head body, and the recess for accommodating the circuit board is not required. Can be used, and the number of parts of the fire detector can be reduced, so that the manufacturing cost of the fire detector can be reduced.

Further, since only one circuit board provided with the electric circuit device is required, the manufacturing cost of the fire detector E can be kept low. In addition, since the light emitting element is provided on the upper surface of the circuit board so as to lie substantially in parallel, the fire detector can be made thinner, so that the freedom of design of the fire detector is not restricted, thereby reducing the manufacturing cost. There are excellent effects such as lowering.

Furthermore, since only one light emitting element and one circuit board provided with the electric circuit device are required, the manufacturing cost of the fire detector can be kept low.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view mainly showing a light conducting member as a main part of a fire detector with a confirmation light according to the present invention.

FIG. 2 is a view schematically showing another example of the fire detector with a confirming light according to the present invention. FIG. 2 (a) is an exploded perspective view showing the appearance, and FIG. It is sectional drawing.

FIG. 3 is a schematic diagram showing a fitting state between a head body and a base portion. FIG. 3A shows that a blade provided on the head body and a blade provided on the base portion are completely connected. FIG. 3B is a diagram showing a state in which the blade provided on the head body and the blade provided on the base portion are insufficiently fitted.

FIG. 4 is a view schematically showing another example of the fire detector with a confirmation light according to the present invention, centering on a light conducting member.

FIG. 5 is a view schematically showing another example of the fire detector with a confirmation light according to the present invention, centering on a light conducting member.

FIG. 6 is a partially cutaway sectional view schematically showing another example of the fire detector with a confirmation light according to the present invention.

FIG. 7 is a view schematically showing an example of a conventional fire detector with a confirmation light, and FIG. 7 (a) is an exploded perspective view, and FIG.
(B) is a sectional view.

FIG. 8 is a view schematically showing an example of a conventional fire detector with a confirmation light, and FIG. 8 (a) is an exploded perspective view, and FIG.
(B) is a sectional view.

FIG. 9 is a view schematically showing an example of a conventional fire detector with a confirmation light, and FIG. 9 (a) is a perspective view and FIG.
(B) is a sectional view.

FIG. 10 is a view schematically showing an example of a fire detector with a confirmation light described in Japanese Patent Application No. 7-279426;
10A is a perspective view, and FIG. 10B is a cross-sectional view.

FIG. 11 is a schematic sectional view mainly showing a light conducting member of a fire detector with a confirmation light described in Japanese Patent Application No. 7-279426, and FIG. (Light source) The light trace of the light beam emitted from the front direction is schematically shown,
FIG. 11B schematically shows a light trace of a light beam in a direction deviating from a front direction with respect to a light emitter (light source) inside the light emitting element.

[Explanation of symbols]

 A Fire detector with confirmation light 1 Light emitting element 2 Base 3 Head body 3a Recess 3c, 13c Hole 4 Fire detector 5 Circuit board 6, 61, 62 Light conducting member 6a One end of light conducting member S6a Curved surface 6b Light conducting member The other end of 21, 22

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-81577 (JP, A) JP-A-2-257399 (JP, A) JP-A 7-3089 (JP, U) JP-A-56 65446 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 17/10 G08B 17/00

Claims (8)

(57) [Claims] A light-emitting element, a base portion, a head body which is detachably provided on the base portion, has a concave portion in the center, and has a hole near an outer peripheral side surface; A fire detection unit provided at a central portion of the head unit and housing a sensor, housed in a space formed by the recess of the head body and the fire detection unit, and including the light emitting element, the light emitting element and the sensor. A circuit board provided with an electric circuit device to be operated; and a light conducting member, one end of the light conducting member being optically connected to the light emitting element, and
The other end is provided in a hole provided near the outer peripheral side surface of the head body, and the other end of the light conducting member is used as a confirmation light. Lighted fire detector. 2. The fire detector according to claim 1, wherein a curvature of a curved surface provided at one end of the light conducting member satisfies the following relationship. r = f · (n−1) r is the curvature of a curved surface provided at one end of the light conducting member, f
Denotes a distance from an apparent light emitting position of the light emitting element to one end of the light conducting member, and n denotes a refractive index of the light conducting member. 3. The light-conducting member has a reflection angle of light in the light-conducting member changed from one end to the other end,
To make the direction of light passing through the light conducting member approximately parallel,
2. A portion which is not parallel to the outer shape of the light conducting member.
Or a fire detector with a confirmation light according to 2. 4. The light conducting member has the other end directed substantially downward in the vertical direction, and a reflection surface bent at approximately 45 ° with respect to the vertical direction near the other end. The fire detector with a confirming light according to any one of claims 1 to 3, wherein the fire sensor has a reflecting surface as large as possible. 5. The fire detector according to claim 1, wherein the surface of the other end of the light conducting member is a light scattering surface. 6. An end of the light conducting member is optically connected to the light emitting element when the head body is completely fitted to the base.
A fire detector with a confirmation light according to claim 1. 7. The fire detector according to claim 1, wherein the sensor is a smoke sensor. 8. The fire detector according to claim 1, wherein the sensor is a heat sensor.