Fire alarm system
Patent Information
- Application Number
- JP2022190144
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2022-11-29
- Publication Date
- 2025-09-10
- Estimated Expiration
- 2042-11-29
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a fire alarm system equipped with a fire detector, and more particularly to a fire alarm system having a function of displaying evacuation directions and assisting evacuation in the event of a fire in a facility such as a building or an underground shopping mall. [Background technology]
[0002] When a disaster such as a fire occurs in a building or underground mall, people inside the building often begin to evacuate without knowing detailed information such as the location of the fire or the location of the escape route (emergency exit). Therefore, when there are multiple escape routes in a building or facility, people may not be able to make the right decision, such as choosing the escape route farthest from the fire.
[0003] Conventionally, with regard to evacuation guidance in the event of a fire, there has been an invention relating to an evacuation guidance system in which, for example, multiple flashing devices are lined up along the corridors of a building or facility, and the evacuation direction is displayed by repeatedly controlling the flashing devices to flash in sequence (Patent Document 1). In addition, an invention has been proposed in which an optical warning device equipped with an optical warning display unit that alerts the occurrence of a fire and an evacuation guidance direction display unit having a plurality of directional display marks (arrows) showing different evacuation guidance directions is installed on the upper part of a wall or on a ceiling, and when a fire signal is received, the display of one of the plurality of directional display marks is controlled (Patent Document 2). [Prior art documents] [Patent documents]
[0004] [Patent Document 1] JP 2013-109388 A [Patent Document 2] JP 2016-200847 A Summary of the Invention [Problem to be solved by the invention]
[0005] In the evacuation guidance system described in Patent Document 1, the evacuation direction and route can be shown to evacuees by sequentially flashing flashing devices arranged along the passageway, but in order to make evacuees aware of the evacuation direction in a building or facility with a relatively large floor area, a considerable number of flashing devices must be installed, which requires large-scale construction and increases costs. In addition, there is a problem that during normal times, the flashing devices for evacuation guidance do not blend in with the interior decoration of the building, which may detract from the aesthetic appearance.
[0006] On the other hand, the optical alarm device described in Patent Document 2 can display the evacuation direction using an evacuation guidance direction display unit, but the direction of the arrow to be displayed is selected and set for each optical alarm device using a selection unit such as a rotary switch. Therefore, while this is effective for small buildings with one emergency exit per floor, there is a problem that it cannot display the safest evacuation direction according to the location of the fire in large buildings or facilities with multiple emergency exits.
[0007] The present invention has been made with the above-mentioned problems in mind, and its purpose is to provide a fire alarm system that can display the safest evacuation direction on the surface of a fire detector depending on the location of a fire. Another object of the present invention is to provide a fire alarm system which does not require large-scale construction work, thereby avoiding a significant increase in costs, and which can display evacuation directions on the surface of a fire detector in the event of a fire, without detracting from the aesthetic appearance of the interior of a building. [Means for solving the problem]
[0008] In order to solve the above problems, the present invention provides: A fire alarm system comprising: a plurality of fire detectors each having a display means and arranged within a section and along a passageway of a building or facility; and a receiver having a memory unit and a control unit in which information on the interior structure including the passageways and escape exits in which the plurality of fire detectors are installed and information on the installation positions of the plurality of fire detectors in the building or facility are stored by floor; The control unit is When a detection information signal or a fire detection signal is received from any one of the plurality of fire detectors, determining an evacuation direction for each of a plurality of fire detectors other than the one fire detector and arranged along the passageway based on a positional relationship between the fire detector and the fire detector that detected the fire, a positional relationship between the fire detector and the emergency exit, and an extension direction of the passageway in which the fire detector is installed, and transmitting an information signal regarding the evacuation direction to be displayed on the display means to the corresponding fire detector; The multiple fire detectors arranged along the passageway are configured such that, upon receiving the information signal from the control unit, they display information indicating the evacuation direction on the display means equipped in each fire detector based on the received information signal.
[0009] According to the fire alarm system having the above-mentioned configuration, the safest evacuation direction according to the location of the fire can be displayed by the fire detectors arranged along the passageway. In addition, since the evacuation direction is displayed by the fire detectors, no large-scale construction is required, and a significant increase in costs can be avoided. In addition, the evacuation direction can be displayed by the fire detectors when a fire occurs without detracting from the beauty of the interior decoration of the building.
[0010] Here, preferably, The storage unit is storing, for each of a plurality of fire detectors arranged along the passageway, a first direction vector indicating a direction to other fire detectors determined from the internal structure information and the installation position information, a second direction vector indicating an extension direction of the passageway in which the fire detector is installed, and a third direction vector to the emergency exit; The control unit is For each of the other fire detectors, the second direction vector other than the second direction vector for which the dot product of the first direction vector from the other fire detector to the fire detector that detected the fire and the second direction vector is maximized is identified, and the second direction vector for which the dot product of the identified second direction vector and the third direction vector is maximized is transmitted as the information signal to the corresponding fire detector. According to this configuration, the evacuation direction to be displayed on the display means of each fire detector can be determined relatively easily by vector calculation.
[0011] Also, preferably, the display means is configured to display the information indicating the evacuation direction as an arrow. According to this configuration, the evacuation direction is displayed by an arrow, so that evacuees can easily and intuitively recognize the evacuation direction.
[0012] Furthermore, it is preferable that the display means be composed of a plurality of light-emitting means arranged in a visible portion on the surface of the housing of the fire detector when the fire detector is installed on a ceiling. Alternatively, the display means is configured with a liquid crystal panel or an organic EL panel arranged in a visible portion on the surface of the housing of the fire detector when the fire detector is installed on a ceiling. According to the above-mentioned configuration, it is possible to provide a display means for displaying the evacuation direction in the fire detector without increasing the size of the housing of the existing fire detector or significantly modifying the design.
[0013] Furthermore, preferably, the control unit is configured to transmit an information signal to the one of the fire detectors that has detected a fire, for lighting up all of the light-emitting means that constitute the display means of the one of the fire detectors as operating lights. Alternatively, the control unit is configured to transmit an information signal to the one of the fire detectors that has detected a fire to cause the liquid crystal panel or organic EL panel that constitutes the display means of the one of the fire detectors to be fully lit as an operating light. According to the above-mentioned configuration, it is not necessary to provide the fire detector with an operating light separately from the display means for displaying the evacuation direction, and it is possible to suppress an increase in costs. Effect of the Invention
[0014] According to the fire alarm system of the present invention, the safest evacuation direction can be displayed on the surface of the fire detector according to the location of the fire. In addition, since large-scale construction is not required, a significant increase in costs can be avoided, and the evacuation direction can be displayed on the surface of the fire detector when a fire occurs without impairing the aesthetic appearance of the interior of the building. [Brief description of the drawings]
[0015] [Figure 1] 1 is a perspective view showing an example of a fire detector constituting a fire alarm system of the present invention. [Diagram 2] 1A and 1B are plan views showing an example of an evacuation direction display means provided in a fire detector constituting a fire alarm system of an embodiment. [Diagram 3] 3(A) to 3(D) are diagrams showing examples of evacuation direction display by the evacuation direction display means of FIG. 2. [Figure 4] FIG. 1 is a diagram showing an example of the location of a fire on one floor and the evacuation direction displayed by the evacuation direction display means of a plurality of fire detectors arranged in a passageway. [Diagram 5] 1 is a diagram showing an example of a floor information table stored in a memory unit of a fire receiver constituting the fire alarm system of the present invention; [Figure 6] This figure focuses on a certain fire detector and shows examples of a directional vector to the detector that detected a fire, a directional vector to an emergency exit, and a directional vector of a corridor at the detector's installation location. [Figure 7] 1A is a diagram showing directional vectors for calculating inner product 1 with a focus on a certain fire detector, and 1B is a diagram showing directional vectors for calculating inner product 2. [Figure 8]5 is a flowchart showing an example of a procedure for processing information regarding evacuation directions when a fire is detected in a fire receiver constituting a fire alarm system of the present invention. [Figure 9] 13(A) to 13(D) are diagrams showing examples of other evacuation direction display means provided in a fire detector and examples of display of evacuation directions. [Figure 10] 13A and 13B are diagrams showing still another embodiment of an evacuation direction display means provided in a fire detector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] Hereinafter, an embodiment of a fire alarm system according to the present invention will be described with reference to the drawings. Although not shown, the fire alarm system of this embodiment is configured with a plurality of fire detectors installed at predetermined intervals in a predetermined area of a building or facility, and a fire receiver that receives fire detection signals from the fire detectors via a detector line. In addition, the fire detector has a built-in circuit board that has the function of transmitting detection information of physical quantities associated with a fire, such as heat, smoke, and flames, or a fire detection signal (alert information) that is generated when these physical quantities exceed predetermined values, to a fire receiver via the detector line. Furthermore, the fire detector has a memory means for storing the relationship between floor map information (described later) or a directional vector in the direction in which the corridor extends at the installation location, and the display means to be illuminated for each directional vector.
[0017] As shown in FIG. 1, the fire detector 10 constituting the fire alarm system of this embodiment includes a dome-shaped main body case 11 for housing a circuit board and the like, and a head portion 12 having a plurality of openings 12a and arranged so that a fire detection element faces the innermost portion of each opening 12a. 1, the fire detector 10 is configured to be capable of displaying arrows pointing in at least four mutually orthogonal directions by lighting up light-emitting elements such as built-in LEDs (light-emitting diodes) on surfaces other than the side surfaces of the detector, i.e., the top surface 11A of the main body case 11 and the top surface 12A of the head portion 12. These arrow displays function as evacuation direction display means.
[0018] In Fig. 1, upper surface 11A of main body case 11 is curved, but main body case 11 may be formed to have a flat surface (including an inclined surface). Also, in Fig. 1, upper surface 12A of head part 12 is flat, but it may be a curved surface. However, a sheet-like liquid crystal panel can be used as a means for displaying marks, and in that case, it is desirable that both surfaces 11A and 12A are flat surfaces. It is preferable that the fire detector 10 is a type of detector that adds its own communication address to the fire detection signal. The fire receiver is configured to have a function of referring to information stored in its own storage device (such as a table showing the correspondence between the detector address and the installation location) and identifying the location of the fire based on the communication address of the fire detector included in the received signal.
[0019] The fire receiver is installed in the disaster prevention center or control room of the building to be monitored, and receives detection information signals or fire detection signals from fire detectors installed in various locations to centrally determine the occurrence of a fire or detect the activation of the fire detectors (fire detection).In the event of a fire, it has the function of outputting a fire alarm by sounding the fire receiver itself and sound devices such as bells in each district, the function of performing linked control of the ringing of district bells and smoke exhaust, and the function of displaying the location of the fire on the display. Furthermore, the fire receiver constituting the fire alarm system of this embodiment is configured to have a function of transmitting information relating to the display of the evacuation direction display means provided in the fire detector to the fire detector.
[0020] The fire receiver includes a signal transmitting / receiving unit that receives detection information signals or fire detection signals from the fire detector 10 and transmits information signals to the fire detector, a control unit with a calculation function consisting of a CPU (Central Processing Unit) and the like, a memory unit that stores programs executed by the CPU, map information such as floor plans, installation location information of the fire detectors, calculation formulas for calculating vector inner product values, and the like, an input unit for various commands, an information display unit, a speaker that can output sound, a power supply unit that supplies power supply voltage, etc. The installation location information of the fire detectors is stored in the memory unit in association with address information for communication with the fire receiver that is assigned to the fire detector.
[0021] FIG. 2 shows an example of the configuration of an evacuation direction display means provided in the fire detector 10. 2(A) shows a plurality of bar-shaped display segments SG arranged to form an arrow, and FIG. 2(B) shows a plurality of dot-shaped display segments arranged to form an arrow. Note that display segments SG may also be provided on the surface of support 12b that separates opening 12a of head portion 12. In short, it is sufficient that they are provided in a portion of the housing surface that is visible when the fire detector is installed on a ceiling.
[0022] Each display segment SG is made of a transparent light-guiding material or a translucent material, and has an LED disposed on the back of each display segment, and the direction is displayed by lighting the LED corresponding to the segment that constitutes the arrow to be displayed. The lighting of the segments that represent the arrow may be performed by lighting multiple segments that display the arrow simultaneously, or may be performed by repeating lighting in sequence from the rear end of the arrow to the front.
[0023] 3(A)-(D) show examples of evacuation direction display by a fire detector equipped with the evacuation direction display means configured as described above. Among them, (A) and (C) show examples of evacuation direction display displayed by a fire detector installed in the middle of a straight passage (corridor), and (B) and (D) show examples of evacuation direction display (L-shaped arrow) displayed by a fire detector installed at a corner of the passage (corridor). FIG. 4 also shows an example of an evacuation guidance display in the case where evacuation guidance is provided using evacuation direction display means of a plurality of fire detectors on one floor.
[0024] Fig. 4 shows an example in which a fire has broken out in the upper left room and an emergency exit is located at the lower right as an escape route. As shown in Fig. 4, an arrow indicating a direction away from the fire location FP and toward the emergency exit EXT is displayed on each fire detector 10 arranged in a corridor. Depending on the location of the fire, an arrow indicating a direction toward the stairs ST1 or ST2 as an escape route may be displayed. Also, in Fig. 4, the shortest route toward the emergency exit EXT is selected as the escape route and an arrow is displayed along that route, but depending on the location of the fire, an arrow may be displayed along a circuitous route. In addition, Figure 4 shows an example of displaying an arrow that bends to change direction at corners of the corridor, but since it is sufficient to indicate the evacuation direction, it is also possible to display a straight arrow on all fire detectors that display information.
[0025] In the fire alarm system of this embodiment, when the fire receiver determines that a fire has occurred based on detection information from a fire detector installed in the room where the fire has occurred, the fire receiver refers to a map of the area (floor) stored in its own memory device, selects the safest emergency exit, and transmits information regarding the direction of the arrow displayed on the evacuation direction display means to each fire detector installed in the corridor of that area (floor).
[0026] To enable the above processing, the storage device of the fire receiver stores floor information, which describes the positions of emergency exits on a floor map, the installation positions of each fire detector in the monitoring area, and the direction vectors of corridors (the direction and length of the corridor), as shown in Fig. 5. This floor information is defined and stored by floor. The reason there are multiple columns for the direction vectors of the corridor is that there are fire detectors installed at the corners of L-shaped corridors, fire detectors installed at T-junctions, fire detectors installed at crossroads, etc. The positions of emergency exits and the installation positions of each fire detector can be expressed by coordinate values in a coordinate system (xy coordinates) set according to the floor, as shown in FIG. 6, for example.
[0027] Furthermore, the floor information shown in Figure 5 is to be set and input by the system administrator as part of various setting operations during the system installation work, and after input is completed, it is to be transmitted to each fire detector and stored in the memory means of the fire detector. Alternatively, instead of all of the floor information, information indicating the relationship between a directional vector in the direction in which the corridor extends at the installation location of each fire detector and the display means that should be illuminated for each directional vector may be transmitted and stored.
[0028] In order to make the direction of the arrow instructed by the fire receiver coincide with the direction of the arrow on the map displayed by each fire detector that received the instruction, each fire detector is installed on a wall or ceiling so that, for example, a mark on the main body case always faces a specific direction (for example, north). However, in order to simplify the installation work and avoid installation in the wrong direction, each fire detector may be configured to recognize its own direction by providing a geomagnetic sensor, etc., and then transmit that direction to the receiver. Alternatively, as shown in Figure 6, xy coordinates may be set according to the floor shape of the building, and each fire detector may be installed so that the mark faces a direction defined by the x-axis and y-axis in the set coordinate system.
[0029] Next, the method of determining the direction of the arrow displayed on the evacuation direction display means of each fire detector (hereinafter abbreviated as detector) will be explained with reference to Figures 6 to 7. In the following explanation, the directional vector (direction and distance) from the detector of interest to the detector that detected the fire is designated as A, the directional vector from the position where the detector of interest is installed to the emergency exit (or stairs) is designated as B, and the directional vector in the direction in which the corridor extends at the position where the detector of interest is installed is designated as C.
[0030] First, as shown in FIG. 6, for a detector of interest, a directional vector A of the fire source, a directional vector C of the corridor, and a directional vector B of the emergency exit are identified (first step). If the detector is installed at a crossroads, there will be four directional vectors C of the corridor, if it is at a T-junction, there will be three, and if it is at a straight corridor, there will be two. Next, as shown in FIG. 7(A), the dot product of the directional vector A from the detector of interest to the detector that detected the fire and the directional vectors C of multiple corridors (here, C1 to C3) is calculated, and the directional vector Ci with the maximum dot product value is identified (second step). Incidentally, this vector indicates the direction of the corridor approaching the fire source. In FIG. 7(A), C3 of vectors C1 to C3 corresponds to this vector.
[0031] Next, the dot products of the other direction vectors C (C1, C2) excluding the identified direction vector C (C3) and the direction vectors B (B1 to B3) from the target detector to the multiple emergency exits (or stairs) are calculated, and the direction vector C with the maximum dot product value is identified (third step). In FIG. 6(B), the dot products of vector C1 and vectors B1, B2, B3 and the dot products of vector C2 and vectors B1, B2, B3 are calculated. The vectors identified in this third step indicate the direction of the corridor leading to the emergency exit most directly away from the fire. In FIG. 6(B), vector B1 corresponds to this vector. Note that since the dot product of vectors C1 and B3 is negative, it is not the maximum vector even if the absolute value is large. Then, the direction of the arrow to be displayed on the evacuation direction display means of the detector is determined so as to represent the direction of the directional vector C specified in the third step (fourth step). Then, the above process is executed for all the detectors installed in the corridor of the floor of interest.
[0032] As an exceptional case, if the dot products of direction vector C and direction vector B calculated in the third step are all negative, it means that there is no corridor direction that provides direct access to the emergency exit, so the opposite direction of direction vector A toward the source of the fire is used as the direction of the displayed arrow. Also, if the dot products of direction vector A and direction vector C calculated in the second step are all zero, it means that the source of the fire is in a direction perpendicular to the direction of the corridor, so the direction toward the nearest emergency exit (or staircase) among multiple emergency exits (or staircases) is used as the direction of the displayed arrow.
[0033] Next, an example of a specific procedure for information processing in a fire receiver (hereinafter, receiver) that receives detection information from a sensor that has detected the occurrence of a fire will be described with reference to the flowchart of FIG. 8, the receiver first receives detection information (temperature, smoke density, etc.) from each detector in the monitoring area (step S1), and determines whether or not there is a detector whose temperature, smoke density, etc. exceed a preset threshold value (step S2). If it determines that there is a detector whose threshold value is exceeded (Yes), the receiver proceeds to step S3, where it performs an alarm process to notify the occurrence of a fire by ringing an emergency bell, etc.
[0034] Next, the location of the fire is identified by reading the installation location information of the detector X that detected the fire from the storage device (step S4). Next, the installation location coordinates, the corridor direction vector C, and the emergency exit location coordinates of the detector Y other than the detector X are read from the floor information table (FIG. 5) (step S5), and the direction vector A from the detector Y to the detector X is calculated (step S6). Then, for each of the multiple direction vectors C of the sensor Y read out in step S5, an inner product 1 between the direction vector C of the sensor Y and the direction vector A calculated in step S6 is calculated (step S7). Then, the maximum of the calculated inner products 1 is identified (step S8). Next, a direction vector B from the sensor Y to the emergency exit (or stairs) is calculated using the coordinate values read out in step S5 (step S9).
[0035] Next, for the direction vectors C other than the direction vector C of the dot product 1 determined to be maximum in step S8, the dot product 2 of the direction vector B calculated in step S9 and the direction vector C is calculated (step S10). After that, the maximum one of the dot products 2 calculated in step S10 is identified, and the direction vector C of the identified dot product 2 is transmitted to the detector Y (step S11). Note that, although the direction vector C is transmitted to the detector Y in step S11 in the flowchart of FIG. 8, the direction of the arrow to be displayed in the evacuation direction display means of the corresponding detector Y based on the direction vector C may be determined on the receiver side, and information indicating the direction of the arrow may be transmitted to the detector Y. In this way, it becomes unnecessary to hold information regarding the floor map on the detector side.
[0036] FIG. 9 shows another embodiment of the evacuation direction display means provided on the fire detector. The evacuation direction display means shown in Figure 9 has arc-shaped light-emitting elements (LEDs) L1, L2, L3, and L4 provided at four orthogonal locations on the surface of the main body case 11 of the detector 10, and displays the evacuation direction by illuminating any one of the light-emitting elements, as shown in Figures 9(A) to (D). Instead of providing an arc-shaped light-emitting unit, four light-emitting units L1, L2, L3, and L4 may be provided in a triangle, with their vertices facing up, left, right, and down, as shown in Fig. 10. The four light-emitting units may be provided in the head unit 12 instead of the main body case 11. Furthermore, the number of light-emitting units may be increased to enable display of directions other than the four orthogonal directions.
[0037] As described above, according to the above embodiment, an arrow indicating the evacuation direction is displayed on the evacuation direction display means provided on each detector, so that evacuees who see the displayed arrow can easily and intuitively know the evacuation direction and can quickly reach the emergency exit and evacuate. In addition, since the evacuation direction is displayed by the detector, there is no need to provide a large number of lamps or display devices for displaying the evacuation direction separately from the detector, so large-scale construction is not required and a significant increase in costs can be avoided, and the evacuation direction can be displayed in the event of a fire without detracting from the beauty of the interior decoration of the building.
[0038] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the present invention. For example, in the above embodiment, the case where an arrow indicating the evacuation direction is displayed on the evacuation direction display means provided on the fire detector is described, but current fire detectors are provided with an "operation lamp" to indicate that a fire has been detected when a fire is detected, and are required to turn on the operation lamp when a fire is detected. Therefore, when a fire is detected, all segments of the evacuation direction display means or segments other than the "V-shaped portion" at the tip of the arrow may be turned on. In addition, when the evacuation direction display means is configured with a liquid crystal panel, the entire liquid crystal panel may be illuminated. Furthermore, it goes without saying that an operation lamp may be provided on the detector together with the evacuation direction display means of the above embodiment.
[0039] The evacuation direction display means can be realized by an organic EL panel, in addition to an LED or a liquid crystal panel. In this case, since the organic EL panel has the advantage of being able to display on a curved surface, the top surface 11A of the main body case 11 and the top surface 12A of the head unit 12 can be curved as described with reference to Fig. 1. This increases the degree of freedom in designing the design of the fire detector 10, so that the fire alarm system according to the present invention can be constructed while taking aesthetics into consideration. [Explanation of symbols]
[0040] 10 Fire detector (sensor) 11 Main body case (housing) 12 Head unit (housing) 12a opening 12b Post SG Segment L1, L2, L3, L4 Light emitting part
Claims
1. A plurality of fire detectors having display means and arranged within compartments and along corridors of a building or facility; a receiver having a memory unit and a control unit in which information about the interior structure of the building or facility, including the passageways and emergency exits in which the plurality of fire detectors are installed, and information about the installation positions of the plurality of fire detectors in the building or facility are stored by floor; A fire alarm system comprising: The control unit is When a detection information signal or a fire detection signal is received from any one of the plurality of fire detectors, determining an evacuation direction for each of a plurality of fire detectors other than the one fire detector and arranged along the passageway based on a positional relationship between the fire detector and the fire detector that detected the fire, a positional relationship between the fire detector and the emergency exit, and an extension direction of the passageway in which the fire detector is installed, and transmitting an information signal regarding the evacuation direction to be displayed on the display means to the corresponding fire detector; When a plurality of fire detectors arranged along the passageway receive the information signal from the control unit, the display means of the fire detectors displays information indicating an evacuation direction based on the received information signal. This fire alarm system is characterized by:
2. The storage unit is storing, for each of a plurality of fire detectors arranged along the passageway, a first direction vector indicating a direction to other fire detectors determined from the internal structure information and the installation position information, a second direction vector indicating an extension direction of the passageway in which the fire detector is installed, and a third direction vector to the emergency exit; The control unit is For each of the other fire detectors, the second direction vector other than the second direction vector that maximizes the inner product of the first direction vector from the other fire detector to the fire detector that detected the fire and the second direction vector is identified, and the second direction vector that maximizes the inner product of the identified second direction vector and the third direction vector is transmitted to the corresponding fire detector as the information signal.
2. The fire alarm system according to claim 1,
3. 3. The fire alarm system according to claim 2, wherein the display means displays the information indicating the evacuation direction as an arrow.
4. 4. A fire alarm system as claimed in any one of claims 1 to 3, characterized in that the display means is composed of a plurality of light-emitting means arranged in a visible portion of the surface of the housing of the fire detector when the fire detector is installed on a ceiling.
5. The control unit is 5. The fire alarm system according to claim 4, further comprising an information signal for transmitting to the one fire detector that detects a fire an information signal for lighting up all of the light-emitting means constituting the display means of the one fire detector as operating lights.
6. 4. The fire alarm system according to claim 1, wherein the display means is a liquid crystal panel or an organic EL panel arranged in a visible portion of the surface of the housing of the fire detector when the fire detector is installed on a ceiling.
7. The control unit is 7. The fire alarm system according to claim 6, further comprising an information signal for transmitting to the one fire detector that detects a fire an information signal for fully lighting the liquid crystal panel or organic EL panel constituting the display means of the one fire detector as an operating light.