Fire detector

Abstract

To make it possible to identify a type of a fire sensor without damaging appearance thereof.SOLUTION: According to a fire sensor comprising an operation pilot lamp lighting or flickering during fire detection, shape patterns each for identifying a type of the fire sensor is arranged on a surface of a transparent member that becomes a display part of the operation pilot lamp, and the shape patterns are made to be formed in the same system color as that of appearance of the fire sensor. Further, the detection part is provided at a central part of a housing of the fire sensor, and the shape patterns are made to be formed at positions facing each other so as to sandwich the detection part of the housing.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a fire detector that detects abnormalities such as heat and smoke during a fire, and in particular to a technique that is effective when applied to cases where it is desired to be able to identify the type of heat detector or smoke detector. [Background technology]

[0002] There are various types of fire detectors available, such as heat detectors that use a heat-sensing element such as a thermistor, smoke detectors equipped with a photoelectric element that detects smoke generated by a fire, and infrared detectors equipped with an infrared sensor that detects infrared rays emitted from flames. Furthermore, even if the basic structure of the same type of fire detector is the same, there are different types, such as those with different sensitivities and those that are waterproof or not. Therefore, when installing a fire detector in a building, it is necessary to check the type of fire detector before installing it. Therefore, conventionally, a sticker for identifying the type of fire detector is attached to the surface of the fire detector housing, or the color of the insect screen is changed to make it easier to identify, as in the invention described in Patent Document 1. Also, most fire detectors have a housing (case) that is mainly white so that they are not noticeable when the detector is not triggering an alarm.

[0003] On the other hand, fire detectors are equipped with an operation indicator light that lights up or flashes when a fire is detected or when operation is confirmed during inspection, etc., and this operation indicator light is required to be highly visible when installed on a ceiling surface, for example. Among fire detectors, those using thermistors are generally configured to detect the occurrence of a fire by arranging the thermistor as a heat sensing element in the center of a dome-shaped housing, and attaching the housing to the ceiling surface of a building so that the thermistor faces downward. A window is provided in a part of the fire detector body (housing), and the light-emitting display of the operation indicator light can be seen through the window (for example, Patent Document 2). Some fire detectors are also configured so that the head of a bullet-shaped LED (light-emitting diode) is directly exposed on the surface of the fire detector body (for example, Figure 9 of Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 02-123690 [Patent Document 2] Japanese Patent Application Publication No. 11-175860 [Patent Document 3] Japanese Patent Application Publication No. 08-180273 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, if a type identification sticker that does not take into account the color of the fire detector housing is attached or the color of the insect screen is changed, the color will be different from the surface of the housing, and will stand out when installed on a ceiling or the like, marring the appearance (disrupting the harmony of the appearance). In addition, since the ceiling surface on which the fire detector is installed is often white or a white-based color, installing a fire detector with a white base color makes the fire detector less noticeable. However, many conventional fire detectors use black thermistors, and the thermistor is arranged in the center of the housing facing downwards, and a protector is provided to protect the thermistor, and the protector has radial fins centered on the thermistor to make it easier to capture hot air currents. Therefore, conventional fire detectors have a problem that even if the fire detector itself is not noticeable, the black thermistor stands out, and the fire detector does not blend in with the surrounding colors.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it possible to identify the type of fire detector without impairing the appearance. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides A fire detector equipped with an operation indicator light that lights up or flashes when a fire is detected, A shape pattern for identifying the type of the fire detector is disposed on a surface of a light-transmitting member which serves as an indicator of the operation indicator light, The shape pattern is formed in the same color system as the exterior of the fire detector.

[0008] According to the fire detector configured as described above, in a fire detector having an operation indicator light, it is possible to display the type of the fire detector without creating an uncomfortable feeling in the environment.

[0009] Here, preferably, a detection unit is provided in a central portion of a housing of the fire detector, The shape patterns are formed at opposing positions on the housing with the detection unit therebetween.

[0010] According to this configuration, a plurality of shape patterns for identifying the type of fire detector are provided, which makes the shape patterns easier to check and provides a good balance.

[0011] Alternatively, a detection unit is provided in a central portion of a housing of the fire detector, The housing is provided with a protector portion having a plurality of legs erected on a surface of the housing and covering the detection portion, The geometric pattern is disposed between the plurality of legs.

[0012] In addition, a detection unit is provided in the center of the housing of the fire detector, The shape pattern may be disposed on a surface of the light-transmitting member provided outside the detection unit.

[0013] Furthermore, the housing is provided with a protector portion having legs erected on a surface of the housing and covering the detection portion, The shape pattern is disposed on a surface of the light-transmitting member provided on the outside of the detection unit, including an extension of the leg portion.

[0014] Also, it is preferable that the size of the light-transmitting member is larger than the size of the shape pattern. Effect of the Invention

[0015] The fire detector according to the present invention has the advantage that, during monitoring (when the operation indicator light is off), it blends in with the surrounding colors and makes it possible to identify the type of fire detector without marring the appearance. [Brief description of the drawings]

[0016] [Figure 1] 1A and 1B show an embodiment in which the present invention is applied to a heat detector, in which FIG. [Diagram 2] 2A and 2B show a detailed configuration example of an inner cover constituting the heat detector of the embodiment of FIG. 1, in which (A) is a front cross-sectional view and (B) is a bottom view. [Diagram 3] 3A is a diagram showing an area covered when the outer cover is placed on the inner cover in FIG. 2, and FIG. 3B is a diagram showing an example of a shape pattern for type identification provided on a light emitting portion. [Figure 4] 1. FIG. 4 is a front sectional view showing a modified example of the heat detector according to the embodiment of FIG. [Diagram 5] 1A and 1B show another example of the configuration of the inner cover constituting the heat detector of the embodiment in FIG. 1, where (A) is a front cross-sectional view and (B) is a bottom view. [Figure 6] 1. FIG. 4 is a front sectional view showing still another configuration example of the inner cover constituting the heat detector of the embodiment in FIG. [Figure 7] 13 shows another example of the configuration of the inner cover and the protector portion, where (A) is a front cross-sectional view and (B) is a bottom view. [Figure 8] 1A and 1B show an embodiment in which the present invention is applied to a smoke detector, in which (A) is a front view and (B) is a perspective view. [Figure 9] 13A and 13B show a modified example of the present invention, in which FIG. 13A is a bottom view showing the modified example applied to a heat detector, and FIG. 13B is a perspective view showing the modified example applied to a smoke detector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a heat detector according to the present invention will be described with reference to the drawings. Fig. 1(A) shows a front cross-sectional view of the heat detector of the embodiment, and Fig. 1(B) shows a perspective view of the heat detector of the embodiment. The heat detector 10 of this embodiment is a detector that uses a thermistor as a heat sensing element and can detect a fire by detecting a change in electrical resistance that occurs when air heated by the heat generated by a fire comes into contact with the thermistor, and is configured to be installed and used on the ceiling surface of a building.

[0018] As shown in Figure 1, the heat detector 10 of this embodiment comprises a bottomed, cylindrical main case 11 having an accommodating recess 11A for accommodating heat-sensing components and capable of being connected to a base member attached to the ceiling surface of a building, an outer cover 12 having a protector part in the center that covers the tip of the thermistor and covering the entire opening side of the main case 11, and a decorative cover 13 that covers the peripheral part of the outer cover 12 and hides the mounting screws and wiring on the ceiling surface, and the main case 11 and outer cover 12 form a housing having an internal accommodating space.

[0019] In addition, the heat detector 10 of this embodiment is equipped with a circuit board 14 accommodated in the accommodating recess 11A of the main body case 11, a thermistor 15 mounted on the circuit board 14, and an inner cover 16 having a cylindrical portion 16a having an insertion hole through which the thermistor 15 can be inserted and arranged so that its upper end contacts the surface of the circuit board 14, a funnel-shaped portion 16b extending downward from the cylindrical portion 16a, and a flange portion 16c provided at the lower end of the funnel-shaped portion 16b.

[0020] The circuit board 14 is composed of a printed wiring board on whose upper and lower surfaces electronic components such as resistors, capacitors, and ICs (semiconductor integrated circuits) that constitute an electronic circuit for fire detection are mounted, and the tip of the lead terminal of thermistor 15 penetrates circuit board 14 approximately in the center of circuit board 14 and protrudes from the opposite surface and is connected by flow soldering or the like. In the heat detector of this embodiment, the outer cover 12 and the decorative cover 13 are made of white resin, and the thermistor 15 has a surface coated with white paint such as epoxy resin. If the color of the housing and the color of the thermistor coating are similar, the color should be one that easily reflects the emitted color of the indicator light.

[0021] On the other hand, the outer cover 12 has a circular opening 12A in its center, at least a portion of which abuts (abuts in an overlapping manner) against the flange portion 16c of the inner cover 16, and is provided with a ring-shaped head portion 12B located below the inner cover 16, and the thermistor 15 is arranged so that the head of the thermistor 15 reaches close to the head portion 12B. Furthermore, as shown in Fig. 1(B), a plurality of (e.g., six) partition walls 12C are formed radially between the ring-shaped head portion 12B and the lower wall of the outer cover 12, and openings functioning as inlets that allow outside air to flow into the case are provided between these partition walls 12C. The head portion 12B and the partition walls 12C form a protector portion. Here, the partition walls 12C may be plate-shaped.

[0022] In the heat detector of this embodiment, the inner cover 16 having the mortar-shaped portion 16b is made of a light-transmitting material such as polycarbonate resin, and an LED (light-emitting diode) 17 for notifying an operating state is mounted at a position corresponding to the flange portion 16c of the inner cover 16. The LED 17 emits light of a color (e.g., red) different from that of the housing. A light-guiding portion 16e consisting of a recess is provided at a portion facing the LED 17 on the rear surface of the flange portion 16c of the inner cover 16.

[0023] In addition, the flange 16c is provided with a light reflecting portion 16f on the surface opposite to the light guiding portion 16e (the lower surface in the figure). The light reflecting portion 16f is configured as a recess (groove) having a V-shaped cross section when viewed from the side, and the light of the LED 17 entering from the light guiding portion 16e is reflected by the light reflecting portion 16f and guided from the flange 16c of the inner cover 16 to the entire inner cover 16, and the light is emitted from the inner cover 16, so that it is possible to indicate that the sensor is in operation. The light emitted from the inner cover 16 is emitted to the outside from between the partition walls 12C arranged radially, so that it can be seen from all directions 360 degrees, and the visibility of the operation indicator light is good. The number of LEDs 17 is not limited to one, and may be two or more.

[0024] Furthermore, in the heat detector of this embodiment, light emitted from the funnel-shaped portion 16b and flange portion 16c of the inner cover 16 hits the surface of the central white thermistor 15 and is reflected, allowing the thermistor 15 to also function as a display portion, thereby increasing the apparent area of ​​the light-emitting display and widening the visible direction. Specifically, when the thermistor 15 is a typical black color, part of the cone-shaped portion 16b of the inner cover 16 is hidden by the thermistor 15, and the light of the operation indicator that hits the thermistor 15 is absorbed, reducing the amount of light, but if the surface of the thermistor 15 is a color that easily reflects the light emitted by the indicator, such as white, the light (e.g., red) emitted from the cone-shaped portion 16b hits the surface of the thermistor 15 and is reflected, preventing a reduction in the amount of light and making the light-emitting state easier to see. It is preferable that the surface of the thermistor 15 be given a matte finish (a process that diffuses light) rather than a glossy finish. This allows the light from the cone-shaped portion 16b and the flange portion 16c to be diffusely reflected by the surface of the thermistor 15, making the light-emitting state easier to see.

[0025] Furthermore, in the heat detector of this embodiment, a structure is adopted in which the inside of the cylindrical portion 16a of the inner cover 16 is filled with resin 19. As a result, high-pressure air enters the housing (the board storage space inside the main body case 11) from a hole formed on the ceiling surface through which wiring and the like passes, and the high-pressure air flows out from the gap between the cylindrical portion 16a of the inner cover 16 and the thermistor 15, creating a cylindrical airflow layer around the thermistor 15, which prevents the airflow from blocking the inflow of hot airflow to the thermistor 15, or prevents water from adhering to the thermistor 15, which makes it easier for dust to accumulate and reduces the heat detection function. In addition, by using a white resin as the resin 19 to be filled, the color of the inside of the cylindrical portion 16a (for example, the color of the board surface) is covered by the resin 19 when viewed from the outside. Note that the resin 19 to be filled does not necessarily have to be white, and a white coating may be formed on the surface of the resin after filling with the resin 19.

[0026] Next, the details of the inner cover 16 constituting the heat detector of the embodiment in Fig. 1 will be described with reference to Fig. 2 and Fig. 3. In Fig. 2, (A) is a cross-sectional view of the inner cover 16, (B) is a bottom view of the inner cover 16, Fig. 3(A) is a bottom view showing the area covered when the outer cover 12 is placed on the inner cover 16, and Fig. 3(B) is a diagram showing an example of a shape pattern for type identification provided on the light emitting part. Inner cover 16 is formed of a light-transmitting material, and a concave light guide portion 16e is formed on the back surface of flange portion 16c, and LED 17 is mounted on circuit board 14 so as to face light guide portion 16e. Also, a light reflecting portion 16f consisting of a V-shaped groove is provided on the surface of flange portion 16c on the opposite side to light guide portion 16e, and light emitted from LED 17 is incident on light guide portion 16e, reflected by light reflecting portion 16f, and guided to the entire flange portion 16c.

[0027] In addition, a coating 18 is formed by applying white paint to the surface (the underside in Figure 2) of the mortar-shaped portion 16b of the inner cover 16, and light is emitted from the flange portion 16c of the inner cover 16, making it possible to indicate that the sensor is in operation. Furthermore, in this embodiment, as shown in Fig. 3(A) which shows the area covered when the outer cover 12 is placed on the inner cover 16, the outer annular circular area 16c-1 of the flange 16c is the area covered by the outer cover 12, and is an area that does not emit light to the outside of the housing in the assembled state. On the other hand, the inner annular circular area 16c-2 of the flange 16c is an area that is not covered by the outer cover, and is an actual light-emitting area in the assembled state. This inner area 16c-2 is an area that indicates the type described below. 3(A), six partition walls 12C that cross the flange portion 16c of the inner cover 16 are arranged radially from the center of a circle at intervals of about 60 degrees. The spaces between the partition walls 12C are defined as shape pattern forming regions #1 to #6. FIG. 3A shows an example in which there are six partition walls, but the present invention is not limited to this, and the area indicating the type can be set in a similar manner even if the number of partition walls is other than six.

[0028] In each of the above-mentioned regions #1 to #6, paint of the same color as the paint applied to the cone-shaped portion is applied in a different shape pattern for each type of heat detector, making it possible to distinguish the type of heat detector. Examples of types are as follows: (a) Differential or constant temperature? (b) Whether it is type 1, type 2, or special type; (c) Waterproof or non-waterproof? In order to provide shape patterns that can be individually distinguished for each type, an example of definition is shown below. (definition) Differential: 1 wire / Constant temperature: 2 wires * (Number of wires) Type 1: 1 area, Type 2: 2 consecutive areas, Special: 3 consecutive areas ※(How to use consecutive areas) Waterproof: Single, Non-waterproof: Double (double diagonally) * (Use one side of the area or both sides)

[0029] FIG. 3(A) shows, as an example, a method of indicating the types of the areas #1 to #6 when the detector is a [fixed temperature / waterproof / special type] detector. In this case, since the type is constant temperature, it will be "2 lines", since it is a special type, it will be "3 continuous areas", and since the function is waterproof, it will be "single". In this example, two lines of white paint will be applied to each of the areas #1 to #3. Examples of application shape patterns are shown in Tables 1 and 2 below. Of these, Table 1 shows the relationship between the type of constant temperature sensor and the shape pattern, and Table 2 shows the relationship between the type of differential sensor and the shape pattern.

[0030] [Table 1] [Table 2]

[0031] In addition to the types shown above, there are also shape patterns such as "R-type compatible / P-type compatible" and "with automatic test function / without automatic test function". If the number of shape patterns to indicate the types on the detector increases, it is possible to distinguish between types by increasing the number of lines painted on each area, for example to three, four, etc., even if the number of types to be distinguished increases. In addition, as a method for increasing the number of shape patterns of the types displayed on the detector, we have explained an example of applying paint to the rings so that they are cut along radial lines, but it is also possible to distinguish types by doubling or tripling the rings like tree rings. By combining ring division and ring duplication, it is possible to further increase the number of distinguishable types.

[0032] The area of ​​the white paint applied to each of the regions #1 to #6 of the light emitting section 20 is set to a size that does not reduce the amount of light irradiated from the light emitting section 20 too much and allows the shape pattern to be visually distinguished. The shape pattern applied to the light emitting section 20 may be as shown in FIG. 3(B). The upper row shows the shape pattern of lines crossing the ring used in the above embodiment, which shows one line, two lines, three lines, and four lines from the left. The lower row shows an example of a shape pattern suitable for the case where the circular light emitting section is made into a double circular ring like a tree ring, and shows a shape pattern obtained by dividing the example shown in the upper row into upper and lower parts. In addition, the present invention makes it possible to easily identify the type of detector by processing a shape pattern into a ring-shaped structure (area) and by making the color of the detector body and the color of the ring-shaped structure (ring-shaped indicator light) different, so the number of partitions (fins) of the protector and the way the areas are divided can be applied as appropriate.

[0033] Furthermore, Fig. 9(A) shows a plan view of a heat detector according to a modification of the above embodiment. In this modification, a method of forming a shape pattern when the regions divided by partitions 12C in the inner circular region 16c-2 of the inner flange 16c of the outer cover 12 are designated #1-#6 will be described. The notation of each region is reversed between Fig. 9(A) and Fig. 3(A), but Fig. 3(A) is a bottom view and Fig. 9(A) is a plan view, and the positions of the same regions are reversed between the left and right. In this modified example, a shape pattern is formed in the inner circular area 16c-2 of the flange portion 16c by molding a protrusion corresponding to the forming pattern integrally with the outer cover at a position (edge) where the outer cover 12 contacts the inner circular area 16c-2 of the flange portion 16c of the inner cover 16 so that the protrusion protrudes inward from the edge side of the outer cover 12, and the outer cover 12 is then assembled on top of the inner cover 16 to form a shape pattern that covers (divides) a portion of the inner circular area 16c-2 of the flange portion 16c.

[0034] Furthermore, as shown in Fig. 2(A), the inner cover 16 of this embodiment is provided with three locking pieces 16d formed so as to protrude vertically upward from the mortar-shaped portion 16b (Fig. 2 shows one of the three locking pieces 16d). A claw portion is formed at the tip of the locking piece 16d, and the inner cover 16 is joined to the circuit board 14 by engaging this claw portion with an engagement hole 14a formed in the circuit board 14. Although the three locking pieces have been described in this example, there is no particular problem in engaging two diagonally arranged locking pieces with the engagement holes.

[0035] As shown in FIG. 4, the inner cover 16 may have a shape in which the cylindrical portion 16a is elongated, the cone-shaped portion 16b is eliminated, and the flange portion 16c is directly connected to the cylindrical portion 16a. Also, a white resist or insulating paint may be applied to the surface of the circuit board 14 (the underside in FIG. 4), or it may be silk-screened. Similarly, the surfaces of the mounted components 20 may be painted white. If the light-transmitting material of the inner cover 16 is highly transparent, the circuit board 14 and the mounted components 21 may be seen through the inner cover 16, and the color of the board surface may be visible through the opening of the outer cover 12, or the opening may look black. However, by coloring the surfaces of the circuit board 14 and the mounted components 21 white, the opening of the outer cover 12 can be brightened, and the entire sensor can be made to look uniformly white.

[0036] Next, other configuration examples of the inner cover 16 will be described with reference to Figs. 5 to 7. Among these, the inner cover 16 in Fig. 5 is formed by applying a white paint to the surface of the flange portion 16c and the surface of the bowl-shaped portion 16b excluding the outer periphery, to form a coating 18. In addition, a ring-shaped light emitting portion 20 is provided on the outer periphery of the surface of the bowl-shaped portion 16b, and this light emitting portion 20 is used as a type identification region. The method of forming the shape pattern of this light emitting portion 20 for type determination in the type identification region may be the same as in the above embodiment. In this embodiment, LED light incident through cylindrical light-guiding portion 16e is reflected by light-reflecting portion 16f and spreads horizontally along flange portion 16c, and is emitted from the annular portion of the outer periphery of bowl-shaped portion 16b that is not coated with coating 18. Light-reflecting portion 16f is formed as a groove having a V-shaped cross section when viewed from the direction of arrow C in Fig. 5(B).

[0037] In a sensor to which this embodiment is applied, light emitted from the annular portion of the outer periphery of the cone-shaped portion 16b that is not coated with the coating 18 spreads outward through the gaps between the pillars of the protector, and part of the light is reflected by the surface of the white thermistor 15. This makes it easier to visually confirm the lighting state of the operation indicator light. The white coating 18 may be formed on the back surface of the cone-shaped portion 16b instead of on the front surface, or a white film may be attached instead of being formed by applying paint. The white coating 18 may be formed on both the front and back surfaces of the cone-shaped portion 16b. In this case, the area (range) from which light is emitted from the inner cover 16 is narrowed, and a sufficient amount of light can be obtained as an indicator lamp. Furthermore, when a highly transparent material is used as the material for the inner cover, microfabrication consisting of a large number of thin linear grooves may be applied to the back surface of the light-emitting surface.

[0038] 6, no coating is provided on the entire surface of flange 16c, but a coating 18 is formed by applying white paint to the entire surface of bowl-shaped portion 16b, and a local step portion 16g is provided on the inner periphery of flange 16c, and paint is applied to the surface of step portion 16g to form a different shape pattern for each type of heat detector in light emitting portion 20. Light reflecting portion 16f is formed in a V shape in a side view so as to reflect light from light guiding portion 16e along flange 16c. Therefore, the bottom view of the inner cover 16 shown in Fig. 6 is the same as Fig. 2(B). By providing the step portion 16g in this way, it is possible to avoid the mistake of accidentally applying paint outside the area when applying paint to the light emitting portion 20 to form a different shape pattern for each type of heat detector.

[0039] Figures 7(A) and (B) show modified examples of the heat detector of the above embodiment. Of these, Figure 7(A) is an explanatory cross-sectional view of the inner cover 16, and Figure 7(B) is a view showing the protector part in the center of the outer cover 12 as seen from below. Incidentally, Figure 7(A) shows a cross-section taken along line AA in Figure 7(B).

[0040] As shown in FIG. 7(A), in this modified heat detector, the flange portion 16c of the inner cover 16 is formed so as to protrude outward, and a pair of nearly rectangular trapezoidal convex portions 16h are formed on the surface of the flange portion 16c (the underside in the figure) and arranged at a predetermined pitch in the circumferential direction. In addition, as shown in Fig. 7(B), the outer cover 12 is formed with a plurality of windows 12f arranged in the circumferential direction, which can be fitted with the above-mentioned convex portion 16h. The back surface of the convex portion 16h may be subjected to microfabrication consisting of a number of thin linear grooves. The shape of the convex portion 16h is not limited to a trapezoid (quasi-rectangle), and any shape such as a rhombus, a circle, or an ellipse may be adopted. Furthermore, in the heat detector of this modified example, the formation pattern of the convex portion 16h is changed according to the type of detector, so that the type of detector can be identified. As for the formation pattern, the example of the shape pattern shown in FIG. 2 can be used, but a shape pattern defined elsewhere may also be used.

[0041] Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the light emitting portion 20 is used as a type identification area and is painted with white paint, but it may be painted with paint of a color other than white. As a suitable example, it is desirable to form a coating by applying paint of a color similar to that of the sensor surface and which easily reflects the light of the operation indicator lamp (red, blue, green, yellow, etc.). Furthermore, in the above embodiment, the surface of thermistor 15 is described as being white, but the present invention may also be applied to a heat detector using a thermistor having a non-white surface.

[0042] In addition, in the above embodiment, an example of the shape of the inner cover 16 when a bullet-shaped LED is used as the light-emitting element of the operation indicator light is shown, but instead of the bullet-shaped LED, a thin LED chip that can be surface-mounted can also be used. In that case, as shown in Figure 7(A), a cylindrical light-guiding section 16e can be provided on the flange section 16c of the inner cover 16, with its end face facing the LED chip. Furthermore, in the above embodiment, the present invention has been described as being applied to a heat detector having a protector portion for protecting thermistor 15, but the present invention can also be applied to detectors in general that do not have a protector portion.

[0043] Next, an embodiment of a smoke detector will be described with reference to Figs. 8(A), (B) and 9(B). 8(A) is a plan view of the smoke detector, (B) is a perspective view of the smoke detector, and FIG. 9(B) is a perspective view of a smoke detector of a modified example. As shown in Fig. 8(A), the smoke detector is installed with the installation surface facing up and the smoke inlet facing down (towards the space). In this embodiment, a ring-shaped operation indicator light is installed around the smoke inlet.

[0044] As shown in Fig. 8(B), the smoke inlet of the smoke detector is located between the canopy 12B that covers the dark box and the four pillars 12C that support the canopy 12B, and an annular operation indicator light (16c-2) is arranged on the outside of the canopy at the base of the pillars 12C (opposite the canopy). In the figure, pillar 1 (12C-1) and pillar 2 (12C-2) are visible, and pillars 3 and 4 are hidden behind the canopy, but the explanation will be given assuming that they are arranged in the order pillar 1, pillar 2, pillar 3, and pillar 4 in a clockwise direction. The explanation will be given using the example where the left side of pillar 1 on the right side of pillar 4 is area 1 (#1), the left side of pillar 2 on the right side of pillar 1 is area 2 (#2), the left side of pillar 3 on the right side of pillar 2 is area 3 (#3), and the left side of pillar 4 on the right side of pillar 3 is area 4 (#4).

[0045] Table 3 below shows an example of a definition for using the areas of the annular operation indicator lights adjacent to each area #1-#4 to determine the type of smoke detector. [Table 3]

[0046] As shown in Table 3, the type of smoke detector is defined in correspondence with each area, and a shape pattern for type identification is formed in the corresponding area (#1-#4) of the ring-shaped indicator light according to the definition. For example, if there are three types of smoke detectors, one line corresponds to type 1, two lines to type 2, and three lines to type 3, and the four areas are assigned a shape pattern corresponding to one of the types, hereafter referred to as a "shape pattern". By configuring (forming) in this way, it is possible to identify the type. Figure 8 (B) shows the case of three types of smoke detectors, and shows an example in which a three-line shape pattern is formed in area 1 (#1) and area 3 (#3). In this example, shape patterns are given to two opposing areas in consideration of the ease of checking the shape pattern and balance. In addition, in Table 3, two types of smoke detectors are not assigned shape patterns, but by assigning no shape patterns to types that are used in greater quantities, the efficiency of assigning shape patterns can be improved.

[0047] In addition, when indicating another type, it is possible to indicate another type by adding a shape pattern to the position corresponding to the support (fin) of the region 16c-2 which becomes the operation indicator lamp. A specific example is shown in Table 4 below. [Table 4]

[0048] Table 4 shows that there are three other types of smoke detectors: P type without test function, P type with test function, and R type (with test function). If there is no automatic test function, no shape pattern is formed at the post (fin) position. If the P type has a test function, a shape pattern is formed at the post (fin) position of the annular operation indicator light corresponding to posts 1 and 3. In the case of the R type, a shape pattern is formed at the post (fin) position of the annular operation indicator light corresponding to all posts (Figure 8(B)). As explained in another embodiment, the method of forming the shape pattern is to form it in the same color as the exterior color of the sensor or in a similar color to the exterior color, but this can also be realized by applying paint, attaching a sticker, etc. Here, even if the annular operation indicator light is arranged inside the support pillar, it is possible to form a shape pattern according to the definitions shown in Tables 3 and 4, and the type can be determined in the same manner as described above.

[0049] The modified example shown in Fig. 9(B) is an example of three types of smoke detectors with automatic testing functions, similar to Fig. 8(B), and shows an example of the formation of a shape pattern when a cover member (decorative member) is attached to the outside after the annular operation indicator light is installed. By forming a protrusion that partially covers the annular operation indicator light on the outside cover member by integral molding, and covering the annular operation indicator light cover with the formed protrusion, it is possible to form a shape pattern on the annular operation indicator light according to the criteria explained in the above embodiment. [Explanation of symbols]

[0050] 10 Fire detector 11 Main unit case 12 Outer cover 13 Makeup Cover 14 Circuit Board 15 Thermistor (heat sensing element) 16 Inner cover 16a Cylindrical part 16b Cone-shaped part 16c Tsubabe 16d Locking piece 16e Light guiding part 16f Reflector 17 LED (light emitting element) 18 Coating 19 Filling Resin 20 Light emitting part

Claims

1. A fire detector equipped with an operation indicator light that lights up or flashes when a fire is detected, A shape pattern for identifying the type of the fire detector is disposed on a surface of a light-transmitting member which serves as an indicator of the operation indicator light, A fire detector characterized in that the shape pattern is formed in the same color system as the exterior of the fire detector.

2. A detection unit is provided in the center of a housing of the fire detector, The fire detector according to claim 1 , wherein the geometric patterns are formed at opposing positions on the housing with the detection unit therebetween.

3. A detection unit is provided in the center of a housing of the fire detector, The housing is provided with a protector portion having a plurality of legs erected on a surface of the housing and covering the detection portion, The fire detector according to claim 1 , wherein the geometric pattern is disposed between the plurality of legs.

4. A detection unit is provided in the center of a housing of the fire detector, 2. The fire detector according to claim 1, wherein the geometric pattern is provided on a surface of the light-transmitting member provided outside the detection portion.

5. The housing is provided with a protector portion having legs erected on a surface of the housing and covering the detection portion, 5. The fire detector according to claim 4, wherein the shape pattern is disposed on a surface of the light-transmitting member provided outside the detection unit, including an extension of the leg portion.

6. The fire detector according to claim 1 , wherein the size of the light-transmitting member is larger than the size of the geometric pattern.

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