Fire sensor

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] Fire detectors come in a variety of types, including heat detectors that use heat-sensing elements such as thermistors, smoke detectors with photoelectric elements that detect smoke generated by fires, and infrared detectors with infrared sensors that detect infrared rays emitted from flames. Furthermore, even if fire detectors of the same type have the same basic structure, there are different types, such as those with different sensitivities and those that are waterproof or not. Therefore, when installing fire detectors in a building, it is necessary to confirm the type of fire detector before installation. Therefore, in the past, a sticker for identifying the type of fire detector has been affixed to the surface of the fire detector housing, or the color of the insect screen has been changed to make it easier to identify, as in the invention described in Patent Document 1. Furthermore, many fire detectors have a housing (case) that is primarily white so that they are less noticeable when 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, for example, a ceiling surface. Furthermore, among fire detectors, those that use thermistors are generally configured to detect the occurrence of a fire by disposing the thermistor as a heat-sensing element in the center of a dome-shaped housing, and attaching the housing to the ceiling of a building so that the thermistor faces downward. A window is provided in part of the fire detector body (housing), and the light-emitting display of the operation indicator light can be seen through the window (see, 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 (see, 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 mentioned 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 be noticeable when installed on a ceiling or other surface, which will detract from the appearance (disrupt the harmony of the appearance). Furthermore, since the ceilings on which fire detectors are installed are often white or a white-based color, installing a white-based fire detector can make the fire detector less noticeable. However, many conventional fire detectors use black thermistors, which are arranged facing downward in the center of the housing and are provided with a protector to protect the thermistor, and the protector has radial fins centered on the thermistor to make it easier to capture hot air currents. Therefore, even though the fire detector itself is inconspicuous, the black thermistor stands out, causing the fire detector to not blend in with the surrounding colors, which is a problem.

[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 the surface of a light-transmitting member that serves as an indicator portion of the operation indicator light; The shape pattern is formed in the same color as the exterior of the fire detector.

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

[0009] Here, preferably, a detection unit is provided in the center of a housing of the fire detector, The shape patterns are formed at positions on the housing that face each other 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 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 shape 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 part having legs erected on a surface of the housing and covering the detection part, The shape pattern is arranged on the surface of the light-transmitting member provided outside the detection unit, including on an extension of the leg portion.

[0014] Preferably, the size of the light-transmitting member is larger than the size of the shape pattern. [Effects of the Invention]

[0015] The fire detector according to the present invention has the advantage that it blends in with the surrounding colors during monitoring (when the operation indicator light is off), making it possible to identify the type of fire detector without damaging the appearance. [Brief explanation 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 (A) is a front cross-sectional view and (B) is a perspective view. [Figure 2] 2A and 2B show a detailed configuration example of an inner cover that constitutes the heat detector of the embodiment of FIG. 1, where (A) is a front cross-sectional view and (B) is a bottom view. [Figure 3] 3A is a diagram showing an area covered when the outer cover is placed on the inner cover of FIG. 2, and FIG. 3B is a diagram showing an example of a shape pattern for type identification provided on the light emitting portion. [Figure 4] FIG. 2 is a front cross-sectional view showing a modified example of the heat detector of the embodiment of FIG. [Figure 5] 1. It shows another example of the configuration of the inner cover constituting the heat detector of the embodiment of FIG. 1, (A) is a front cross-sectional view, and (B) is a bottom view. [Figure 6] 1. FIG. 4 is a front cross-sectional view showing still another example of the inner cover constituting the heat detector of the embodiment of FIG. [Figure 7] 10A and 10B show another example of the configuration of the inner cover and the protector portion, where FIG. 10A is a front cross-sectional view and FIG. 10B 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] 10A and 10B show a modified example of the present invention, in which (A) is a bottom view showing the modified example applied to a heat detector, and (B) is a perspective view showing the modified example applied to a smoke detector. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of a heat detector according to the present invention will be described below with reference to the drawings. Fig. 1(A) shows a front cross-sectional view of the heat detector according to the embodiment, and Fig. 1(B) shows a perspective view of the heat detector according to 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 the 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, etc.

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

[0019] The heat detector 10 of this embodiment also includes a circuit board 14 accommodated in the accommodation 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 with an insertion hole through which the thermistor 15 can be inserted and arranged so that its upper end is in contact with 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 made up of a printed wiring board on whose top and bottom surfaces electronic components such as resistors, capacitors, and ICs (semiconductor integrated circuits) that make up the electronic circuit for fire detection are mounted, and the tips of the lead terminals of thermistor 15 penetrate the circuit board 14 at approximately the center of the circuit board 14 and protrude from the opposite surface, and are 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 color of the indicator light.

[0021] On the other hand, the outer cover 12 has a circular opening 12A formed 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 a ring-shaped head portion 12B is provided 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 that function 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 cone-shaped portion 16b is made of a light-transmitting material such as polycarbonate resin, and an LED (light-emitting diode) 17 for indicating 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 formed as a recess is provided at a position facing the LED 17 on the back surface of the flange portion 16c of the inner cover 16.

[0023] Additionally, a light reflecting portion 16f is provided on the surface of the flange 16c opposite the light guiding portion 16e (the bottom surface in the figure). The light reflecting portion 16f is configured as a recess (groove) with a V-shaped cross section when viewed from the side. Light from the LED 17 entering the light guiding portion 16e is reflected by the light reflecting portion 16f and guided through the flange 16c of the inner cover 16 to the entire inner cover 16, where it is emitted from the inner cover 16, thereby indicating that the sensor is activated. The light emitted from the inner cover 16 is emitted to the outside through the radially arranged partition walls 12C, making it visible from all directions 360 degrees, improving the visibility of the operation indicator light. The number of LEDs 17 is not limited to one, and two or more may be used.

[0024] Furthermore, in the heat detector of this embodiment, the light emitted from the mortar-shaped portion 16b and the 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 luminous display and widening the visible direction. Specifically, if the thermistor 15 is a typical black color, it will partially obscure the cone-shaped portion 16b of the inner cover 16, and the light from the operation indicator that hits the thermistor 15 will be absorbed, reducing the amount of light. However, 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 will hit the surface of the thermistor 15 and be reflected, preventing a reduction in the amount of light and making the light-emitting state more visible. It is preferable to give the surface of the thermistor 15 a matte finish (a process that diffuses reflection) rather than a glossy finish. This causes 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 more visible.

[0025] Furthermore, the heat detector of this embodiment employs a structure in which resin 19 is filled inside cylindrical portion 16a of inner cover 16. This allows high-pressure air to enter the housing (the circuit board storage space inside main body case 11) through a hole formed in the ceiling surface for passing wiring, etc., and then flow out through the gap between cylindrical portion 16a of inner cover 16 and thermistor 15, creating a cylindrical airflow layer around thermistor 15. This airflow prevents the inflow of hot air to thermistor 15 from being obstructed, and prevents water from adhering to thermistor 15, which can easily cause dust to accumulate and reduce the heat detection function. Furthermore, by using a white resin as the filling resin 19, the color of the inside of cylindrical portion 16a (e.g., the color of the circuit board surface) is obscured by resin 19 when viewed from the outside. Note that the filling resin 19 does not necessarily have to be white; a white coating may be formed on the surface of the resin after filling.

[0026] Next, 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 section. Inner cover 16 is formed of a light-transmitting material, and a concave light-guiding portion 16e is formed on the back surface of flange 16c, and LED 17 is mounted on circuit board 14 so as to face light-guiding portion 16e. In addition, a light-reflecting portion 16f consisting of a V-groove is provided on the surface of flange 16c on the opposite side from light-guiding portion 16e, and light emitted from LED 17 is incident on light-guiding portion 16e, reflected by light-reflecting portion 16f, and guided throughout flange 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 Figure 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 outside the housing when assembled. On the other hand, the inner annular circular area 16c-2 of the flange 16c is an area not covered by the outer cover and is the actual light-emitting area when assembled. This inner area 16c-2 is the area that indicates the type, which will be described later. 3(A), six partition walls 12C that cross the flange portion 16c of the inner cover 16 are arranged radially from the center of the circle at intervals of approximately 60 degrees, and the spaces between the partition walls 12C are defined as shape pattern forming regions #1 to #6. Although FIG. 3A shows an example in which there are six partition walls, the number of partition walls is not limited to six, and the regions indicating the types can be set in the same manner even if there are other numbers of partition walls.

[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) Type 1, Type 2, or Special Type; (c) Waterproof or non-waterproof? In order to make each type of shape pattern distinct from the others, 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 notating 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 "two lines", since it is a special type, it will be "three continuous areas", and since the function is waterproof, it will be "single", and in this example, two lines of white paint will be applied to each of 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 indicate the types in a way that distinguishes them even if the number of types to be distinguished increases, for example, by increasing the number of lines painted on each area to three, four, etc. In addition, as a method for increasing the number of shape patterns of the types displayed on the detector, we have explained an example in which paint is applied to cut the ring along radial lines, but it is also possible to distinguish types by doubling or tripling the ring like tree rings. Combining ring division and ring multiplication can 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 unit 20 is set to a size that does not reduce the amount of light emitted from the light emitting unit 20 too much, and that allows the shape pattern to be visually distinguished. The shape patterns applied to the light emitting unit 20 may be as shown in FIG. 3(B). The upper row shows the shape patterns of lines crossing the ring used in the above embodiment, which are shown from left to right as one line, two lines, three lines, and four lines. The lower row shows an example of a shape pattern suitable for when the circular light emitting unit is made into a double ring like tree rings, 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 different from the color of the ring-shaped structure (ring-shaped indicator light), 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 for forming a shape pattern when the regions #1-#6 are defined by partition walls 12C in circular region 16c-2 on the inner side of flange 16c on the inner side of outer cover 12 is 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, so the positions of the same regions are reversed left to right. In this modified example, the shape pattern is formed in the area of 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 12 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 it protrudes inward from the edge side of the outer cover 12, and by assembling the outer cover 12 on top of the inner cover 16, a shape pattern is formed 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 to protrude vertically upward from the funnel-shaped portion 16b (Fig. 2 shows one of the three locking pieces 16d). Claw portions are formed at the tips of the locking pieces 16d, and these claw portions engage with locking holes 14a formed in the circuit board 14, thereby joining the inner cover 16 to the circuit board 14. Although three locking pieces have been described in this example, there is no particular problem if two diagonally arranged locking pieces are engaged with the locking holes.

[0035] As shown in FIG. 4, the inner cover 16 may have a shape in which the cylindrical portion 16a is elongated, the mortar-shaped portion 16b is eliminated, and the flange portion 16c is directly connected to the cylindrical portion 16a. Furthermore, the surface of the circuit board 14 (the underside in FIG. 4 ) may be coated with a white resist or insulating paint, or 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 visible through the inner cover 16, and the color of the board surface may be visible through the opening in the outer cover 12, or the opening may appear dark. However, by coloring the surfaces of the circuit board 14 and the mounted components 21 white, the opening in the outer cover 12 can be brightened, and the entire sensor can appear to be a uniform white color.

[0036] Next, other configuration examples of the inner cover 16 will be described with reference to Figures 5 to 7. Of these, the inner cover 16 in Figure 5 has a coating 18 formed by applying white paint to the surface of the cone-shaped portion 16b excluding the outer periphery and the surface of the flange portion 16c. In addition, a ring-shaped light emitting portion 20 is provided on the outer periphery of the surface of the cone-shaped portion 16b, and this light emitting portion 20 serves as a type identification area. The method of forming the shape pattern of this light emitting portion 20 for type identification in the type identification area may be the same as in the above-described embodiment. In this embodiment, LED light incident through cylindrical light-guiding portion 16e is reflected by light-reflecting portion 16f, 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 with a V-shaped cross section when viewed from the direction of arrow C in Figure 5(B).

[0037] In a sensor to which this embodiment is applied, light emitted from the annular portion of the outer periphery of the funnel-shaped portion 16b, which is not coated with the coating 18, spreads outward through the gaps in the pillars of the protector, and a portion 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 also 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 light. Furthermore, when a highly transparent material is used as the material for the inner cover, the back surface of the light-emitting surface may be subjected to fine processing with a large number of thin linear grooves.

[0038] 6, no coating is provided on the entire surface of flange 16c, but white paint is applied to the entire surface of cone-shaped portion 16b to form coating 18, and localized steps 16g are provided on the inner peripheral edge of flange 16c, and paint is applied to the surface of these steps 16g to form different shape patterns for different types of heat detectors in light emitting portion 20. Light reflecting portion 16f is formed in a V-shape in 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 from below of the protector portion in the center of the outer cover 12. Incidentally, Figure 7(A) shows a cross section taken along line AA in Figure 7(B).

[0040] As shown in Figure 7(A), this modified heat detector has a flange portion 16c of the inner cover 16 formed to protrude outward, and trapezoidal convex portions 16h that are nearly rectangular are formed on the surface of the flange portion 16c (the underside in the figure) and arranged circumferentially at a predetermined pitch. 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 convex portions 16h. The back surface of the convex portions 16h may be microfabricated with a number of thin linear grooves. The shape of the convex portions 16h is not limited to a trapezoid (quasi-rectangle), and any shape such as a rhombus, circle, or ellipse may be used. Furthermore, in the heat detector of this modified example, the formation pattern of the convex portions 16h is changed depending on the type of detector, so that the type of detector can be identified. Regarding 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 embodiments, the present invention is not limited to the above embodiments. For example, in the above embodiments, the light emitting portion 20 is used as a type identification area and is painted white, but it may be painted with 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 that easily reflects the light of the operation indicator lamp (red, blue, green, yellow, etc.). Furthermore, in the above embodiment, the surface of the thermistor 15 is described as being white, but the present invention may also be applied to a heat detector that uses a thermistor with 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, it is also possible to use a thin LED chip that can be surface-mounted.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, and its end face can be configured to face 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 that protects the thermistor 15, but it is also possible to apply the present invention 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), 8(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 Figure 8(A), the smoke detector is installed with the installation surface facing up and the smoke inlet facing down (towards the space). In this example, a ring-shaped operation indicator light is installed around the smoke inlet.

[0044] As shown in Figure 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 located outside the canopy on the base side of the pillars 12C (opposite the canopy). In the figure, pillars 1 (12C-1) and 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 clockwise order as pillars 1, 2, 3, and 4. The explanation will be given using an example where the area to the right of pillar 4 and the left of pillar 1 is area 1 (#1), the area to the right of pillar 1 and the left of pillar 2 is area 2 (#2), the area to the right of pillar 2 and the left of pillar 3 is area 3 (#3), and the area to the right of pillar 3 and the left of pillar 4 is area 4 (#4).

[0045] Table 3 below shows an example of a definition for using the area of the annular operation indicator light 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 region, and a shape pattern for type identification is formed in the corresponding region (#1-#4) of the annular indicator light according to that 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 each of the four regions is assigned a corresponding type (hereinafter referred to as a "shape pattern"). By configuring (forming) the pattern in this manner, it becomes possible to identify the type. Figure 8(B) shows an example of three types of smoke detectors, with a three-line shape pattern formed in region 1 (#1) and region 3 (#3). In this example, shape patterns are applied to two opposing regions, taking into consideration 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 larger quantities, the efficiency of assigning shape patterns can be improved.

[0047] Furthermore, 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 area 16c-2 that serves as the operation indicator light. Specific examples are 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 support (fin) position; if the P type has a test function, a shape pattern is formed at the support (fin) position of the ring-shaped operation indicator light corresponding to support 1 and support 3; and in the case of the R type, a shape pattern is formed at the support (fin) position of the ring-shaped operation indicator light corresponding to all support posts (Figure 8(B)). As explained in another embodiment, the shape pattern is formed 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 achieved by applying paint, sticking a sticker, etc. Here, even when the annular operation indicator light is placed inside the support pillar, it is possible to form a shape pattern according to the definitions shown in Tables 3 and 4, and type determination can be made in the same manner as described above.

[0049] The modified example shown in Figure 9(B) is an example of a smoke detector with an automatic testing function for three types, similar to Figure 8(B), and shows an example of forming 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 standards explained in the above example. [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 Funnel-shaped part 16c Tsubabe 16d Locking piece 16e Light guiding part 16f Reflector 17 LED (light emitting element) 18 Coating 19 Filled 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 the surface of a light-transmitting member that serves as an indicator portion of the operation indicator light; A fire detector characterized in that the shape pattern is formed in the same color as the exterior of the fire detector.

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

3. A detection unit is provided in the center of the 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 shape pattern is disposed between the plurality of legs.

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

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 translucent member provided outside the detection unit, including an extension of the leg portion.

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

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