Fire alarm

Abstract

To provide a fire alarm that can suppress an erroneous notifications related to occurrence of a fire.SOLUTION: A fire alarm (10) comprises: a smoke detection unit (1) that outputs a smoke detection signal upon detecting smoke; a smell detection unit (2) that detects smell and outputs a physical amount corresponding to the detected smell as a smell detection signal; an alarming unit (4) that emits notification that a fire has occurred; and a control unit (3) that controls the notification by the alarming unit (4) on the basis of the smoke detection signal from the smoke detection unit (1) and the smell detection signal from the smell detection unit (2). The control unit (3) monitors for a smell detection signal output from the smell detection unit (2) upon output of a smoke detection signal from the smoke detection unit (1), and suppresses the notification by the alarming unit (4) if a smell detection target pattern for determining a factor of an erroneous detection by the smoke detection unit (1) is detected.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to fire alarms. [Background technology]

[0002] In order to detect fires early, it is common to set the smoke detection sensitivity of fire alarms high. However, if the smoke detection sensitivity of a fire alarm is set too high, it may detect non-fire smoke, such as cigarette smoke, which is not caused by a fire, and this increases the possibility of false alarms.

[0003] The following fire alarm is known as prior art (see, for example, Patent Document 1). The fire alarm in Patent Document 1 is equipped with a smoke detection unit that detects smoke, and a fire determination unit that determines whether or not there is a fire based on an output signal from the smoke detection unit and outputs a fire signal in the event of a fire. The fire alarm in Patent Document 1 is also equipped with an odor detection unit that detects the odor of nicotine, and a smoking determination unit that determines whether smoking has occurred based on an output signal from the odor detection unit.

[0004] With this configuration, when the smoking detection unit detects that smoking has occurred, it outputs a smoking signal to the fire detection unit and stops the output of the fire signal. As a result, the fire alarm of Patent Document 1 can prevent false fire alarms caused by cigarette smoke. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-275286 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional technology has the following problems. In addition to cigarette smoke, other non-fire-related smoke that can cause false alarms include smoke from incense sticks, burning incense, and candles in temples. Steam from showering can also cause false alarms.

[0007] In contrast, the fire alarm disclosed in Patent Document 1 is designed to detect only the specific odor of cigarette smoke. Therefore, when non-fire-related smoke other than cigarette smoke is generated, it cannot identify and detect it, and there is a risk of false alarms. Therefore, a fire alarm that can reduce false alarms for various non-fire-related causes is desired.

[0008] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fire alarm that can reduce false alarms regarding the occurrence of a fire. [Means for solving the problem]

[0009] The fire alarm according to the present disclosure comprises a smoke detection unit that outputs a smoke detection signal when it detects smoke, an odor detection unit that detects odors and outputs a physical quantity corresponding to the detected odor as an odor detection signal, an alarm generation unit that generates an alarm that a fire has occurred, and a control unit that controls the generation of an alarm by the alarm generation unit based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit, wherein the control unit pre-stores odor-related physical quantities for identifying causes of erroneous detection by the smoke detection unit as odor detection target patterns, and the control unit monitors the odor detection signal output from the odor detection unit when a smoke detection signal is output from the smoke detection unit, and if the odor detection target pattern is detected in the odor detection signal, it inhibits the alarm generation unit from generating an alarm, and if the odor detection target pattern is not detected in the odor detection signal, it inhibits the alarm generation unit from generating an alarm. The odor detection target pattern stored in the control unit is learned data that has been previously learned using the odor detection unit to learn odor detection signals corresponding to each odor in order to identify the cause of erroneous detection, and the control unit uses the learned data to determine whether or not the odor detection target pattern has been detected in the odor detection signal. The fire alarm according to the present disclosure includes a smoke detection unit that outputs a smoke detection signal when it detects smoke, an odor detection unit that detects odors and outputs a physical quantity corresponding to the detected odor as an odor detection signal, an alarm generation unit that generates an alarm that a fire has occurred, and a control unit that controls the generation of an alarm by the alarm generation unit based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit, and the control unit stores in advance, as an odor detection target pattern, physical quantities related to odors that the smoke detection unit uses to identify smoke caused by a fire, and the control unit controls the generation of an alarm when the smoke detection signal is output from the smoke detection unit. When the odor detection signal is detected, the odor detection signal output from the odor detection unit is monitored, and if an odor detection target pattern is not detected in the odor detection signal, the alarm unit is prevented from issuing an alarm, and if an odor detection target pattern is detected in the odor detection signal, the alarm unit is caused to issue an alarm.The odor detection target patterns stored in the control unit are learned data that have been learned in advance using the odor detection unit to determine whether or not an odor detection target pattern has been detected in the odor detection signal.The control unit uses the learned data to determine whether or not an odor detection target pattern has been detected in the odor detection signal. In addition, the fire alarm of the present disclosure comprises a smoke detection unit that outputs a smoke detection signal when smoke is detected, an odor detection unit that detects odors and outputs a physical quantity corresponding to the detected odor as an odor detection signal, an alarm unit that issues an alarm that a fire has occurred, and a control unit that controls the issuance of an alarm by the alarm unit based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit, and the control unit pre-stores odor-related physical quantities used by the smoke detection unit to identify smoke caused by a fire as an odor detection target pattern, and the control unit monitors the odor detection signal output from the odor detection unit, and if the odor detection target pattern is detected in the odor detection signal, increases the smoke detection sensitivity of the smoke detection unit. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to obtain a fire alarm that can reduce false alarms regarding the occurrence of a fire. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a block diagram showing an overall configuration of a fire alarm according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram illustrating examples of odor patterns associated with incense sticks, burning incense, and candles according to the first embodiment of the present disclosure. [Figure 3] 4 is a flowchart showing a series of operations performed by a control unit according to the first embodiment of the present disclosure. [Figure 4] FIG. 2 is a diagram illustrating examples of odor patterns for incense sticks of different manufacturers or brands according to the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, preferred embodiments of the fire alarm of the present disclosure will be described with reference to the drawings. The fire alarm according to the present disclosure uses a smoke detection unit and an odor detection unit in combination, and stores in advance an odor detection target pattern for identifying the cause of erroneous detection by the smoke detection unit. The fire alarm according to the present disclosure has a technical feature in that when smoke is detected by the smoke detection unit, the odor detection signal output from the odor detection unit is checked, and if the odor detection target pattern is detected in the signal, the alarm is inhibited from being issued by the alarm issuing unit.

[0013] In the following embodiment, a fire alarm is installed inside a temple, and when smoke from incense, burning incense, and candles is detected as non-fire-related smoke that is not caused by a fire, a specific example of how the alarm unit is prevented from issuing an alarm is described in detail.

[0014] Embodiment 1 1 is a block diagram showing the overall configuration of a fire alarm according to the first embodiment of the present disclosure. As described above, the fire alarm 10 according to the first embodiment is installed inside a temple.

[0015] The fire alarm 10 comprises a smoke detection unit 1, an odor detection unit 2, a control unit 3, and an alarm generation unit 4.

[0016] The smoke detector 1 monitors whether or not smoke is present in the surrounding area.

[0017] The smoke detection unit 1 is, for example, a photoelectric spot-type detector, and is equipped with a light-emitting unit and a light-receiving unit in the space inside the housing. When smoke occurs inside the temple where the unit is installed and flows into the housing of the smoke detection unit 1, the light from the light-emitting unit hits the smoke particles and is diffusely reflected. The smoke detection unit 1 makes use of this characteristic, and when the light-receiving unit detects diffusely reflected light that exceeds a specified level, it outputs a signal indicating that smoke has been detected to the control unit 3. This signal is called the smoke detection signal.

[0018] The odor detection unit 2 monitors surrounding odors. In the present embodiment 1, a quartz crystal oscillator sensor equipped with a transducer and multiple types of sensitive films is used as an example of the odor detection unit 2. In the following description, it is assumed, as an example, that the odor detection unit 2 is equipped with 16 types of sensitive films.

[0019] The sensitive film is a sensor that detects odor components when they are adsorbed. The sensitive film is mounted on the surface of a quartz substrate together with electrodes, and vibrates when a voltage is applied to the electrodes. When an odor component is adsorbed, the vibration frequency of the sensitive film changes depending on the weight of the odor component.

[0020] The transducer detects the change in vibration frequency that occurs in the sensitive membrane and converts this change into data in a digitally processable format.

[0021] The odor detection unit 2 acquires the odor detection values ​​corresponding to each sensor membrane at a specified interval, thereby generating a waveform that represents the temporal change in the detection values. In this example, the odor detection unit 2 is equipped with 16 types of sensor membranes, so the odor detection unit 2 can generate 16-channel waveforms corresponding to the types of sensor membranes. A pattern combining these 16-channel waveforms is referred to as an odor pattern, or simply a pattern.

[0022] Fig. 2 is a diagram illustrating odor patterns associated with incense sticks, burning incense, and candles in the present embodiment 1. In Fig. 2, the odor detection unit 2 can obtain a pattern in which, for the odor of incense sticks and burning incense, channels 1 and 2 out of 16 channels have a strong response, while the other channels have a medium or weak response.

[0023] Furthermore, with respect to the smell of candles, the odor detection unit 2 can obtain a pattern in which channels 5, 15, and 16 react strongly, while the other channels react moderately or weakly.

[0024] In this way, the odor detection unit 2 can identify odor components occurring inside a temple based on the combination pattern of channels with high response and channels with low response.

[0025] That is, in this embodiment 1, the odor detection unit 2 can monitor whether or not the odors of incense, burning incense, or candles are detected among the odors occurring inside the temple as odors for identifying the cause of erroneous detection by the smoke detection unit 1.

[0026] Thus, in the present embodiment 1, the odors of incense sticks, burning incense, and candles are the odors to be detected by the odor detection unit 2. The odor pattern when at least one of incense sticks, burning incense, and candles is burned is the odor detection target pattern.

[0027] As described above, the odor detection target pattern is an odor-related pattern for identifying the cause of erroneous detection by the smoke detection unit 1. In addition, the odor detection target pattern is an odor pattern detected by multiple types of sensitive films.

[0028] The odor detection unit 2 outputs the odor pattern detected by each sensitive film to the control unit 3 as an odor detection signal.

[0029] The odor detection sensitivity of the odor detection unit 2 is generally higher than the smoke detection sensitivity of the smoke detection unit 1. In other words, it can be expected that the odor detection speed of the odor detection unit 2 will be faster than the smoke detection speed of the smoke detection unit 1.

[0030] Returning to the explanation of Figure 1, the control unit 3 is a microcomputer that controls the issuance of an alarm by the alarm issuing unit 4 based on the smoke detection signal from the smoke detection unit 1 and the odor detection signal from the odor detection unit 2. The control unit 3 includes an alarm issuing control unit 3A and an odor identification unit 3B.

[0031] During normal times when the odor detection unit 2 has not detected an odor-related pattern for identifying the cause of erroneous detection, the odor identification unit 3B outputs a signal to the alarm control unit 3A indicating permission for the alarm to be issued by the alarm issuing unit 4. This signal is referred to as the permission signal.

[0032] On the other hand, if the odor detection signal output from the odor detection unit 2 detects odor patterns of incense, burning incense, and candles, the odor identification unit 3B turns off the permission signal it is outputting to the alarm control unit 3A.

[0033] In this embodiment 1, the odor patterns when incense sticks are burned, the odor patterns when incense is burned, and the odor patterns when a candle is burned are learned in advance using the odor detection unit 2.

[0034] In addition, in this embodiment 1, the odor pattern when two items are burned simultaneously, such as the odor pattern when incense sticks and incense are burned simultaneously, can be learned in advance using the odor detection unit 2.

[0035] Furthermore, in the first embodiment, the odor detection unit 2 can be used to learn in advance the odor pattern when three items, incense sticks, incense burners, and candles, are burned simultaneously.

[0036] The odor identification unit 3B then stores this learned data. The odor identification unit 3B uses this learned data to determine whether the odor patterns of incense, burning incense, and candles have been detected in the odor detection signal. If the odor patterns of incense, burning incense, and candles have been detected in the odor detection signal, the odor identification unit 3B turns off the permission signal.

[0037] Here, a method is adopted in which the odor patterns of incense sticks, burning incense, and candles are detected using learned data with AI (Artificial Intelligence). Alternatively, a method may be adopted in which the odor patterns of incense sticks, burning incense, and candles are detected based on predetermined rules. In this case, for example, a reference pattern of the odors of incense sticks, burning incense, and candles is stored in the odor identification unit 3B. The odor identification unit 3B then detects the odor patterns of incense sticks, burning incense, and candles by determining whether the difference between this reference pattern and the odor pattern obtained from the odor detection unit 2 is within an acceptable range.

[0038] When the smoke detection signal is ON and the permission signal is ON, the alarm control unit 3A outputs a signal indicating that a fire has occurred to the alarm unit 4. This signal is called an alarm command signal. On the other hand, when either the smoke detection signal or the permission signal, or both, are OFF, the alarm control unit 3A turns off the output of the alarm command signal.

[0039] The alarm unit 4 is an alarm device that issues a fire alarm and includes an amplifier and a speaker. The alarm unit 4 issues a fire alarm when the alarm command signal from the control unit 3 switches from off to on. The alarm unit 4 stops the fire alarm when the alarm command signal from the control unit 3 switches from on to off.

[0040] The alarm unit 4 may be equipped with a communication device that enables wireless or wired communication. If equipped with a communication device, the alarm unit 4 transmits a message to an external device (not shown) installed at a distance when the alarm command signal switches from off to on, indicating that a fire has occurred. On the other hand, the alarm unit 4 transmits a message to the external device when the alarm command signal switches from on to off, indicating that the fire has been extinguished.

[0041] 3 is a flowchart showing a series of operations performed by the control unit 3 according to the first embodiment of the present disclosure. The control unit 3 repeatedly executes the flowchart shown in FIG. 3 until the fire alarm 10 is powered off.

[0042] In step S101, the control unit 3 determines whether or not a smoke detection signal has been input from the smoke detection unit 1. If a smoke detection signal has not been input, the control unit 3 turns off the alarm command signal in step S103, and ends the series of processes. In step S103, the alarm generation unit 4 maintains its stopped state if it is not generating an alarm, and stops its alarm generation operation if it is generating an alarm.

[0043] On the other hand, if a smoke detection signal is input in step S101, the control unit 3 determines that smoke has been detected inside the temple, and proceeds to step S102.

[0044] In step S102, the control unit 3 determines whether an odor detection target pattern, i.e., an odor pattern caused by at least one of incense, burning incense, and candles, has been detected in the odor detection signal. Here, the odor of smoke caused by incense, burning incense, and candles differs from the odor of smoke caused by a fire and corresponds to the odor when a factor that causes a false detection by the smoke detection unit 1 occurs.

[0045] If the odor detection target pattern is detected in the odor detection signal, the control unit 3 proceeds to step S103, where the control unit 3 turns off the alarm command signal and ends the series of processes.

[0046] On the other hand, if the odor detection target pattern is not detected in the odor detection signal, the control unit 3 determines that no erroneous detection factors due to incense sticks, burning incense, or candles have occurred, and proceeds to step S104.

[0047] In step S104, the control unit 3 turns on the alarm command signal to cause the alarm unit 4 to issue an alarm that a fire has occurred. In step S104, the alarm unit 4 maintains the alarm state if an alarm has been issued, and starts an alarm operation if an alarm has not been issued.

[0048] After step S104, the control unit 3 ends the series of processes.

[0049] To improve the accuracy of odor detection, it is possible to prepare incense sticks, incense, and candles from specific manufacturers and brands that are commonly used in temples where fire alarm 10 is installed, and have the odor detection unit 2 learn the odor patterns of these in advance. In other words, it is possible to have the unit learn in advance as many odor detection target patterns as possible that could be the cause of false detection.

[0050] FIG. 4 is a diagram illustrating examples of odor patterns of incense sticks from different manufacturers or brands according to the first embodiment of the present disclosure.

[0051] Even if the incense sticks are the same, the ingredients they contain will differ if the manufacturer or brand is different. As a result, the detected odor pattern will differ depending on the manufacturer or brand, as shown in Figure 4. While incense sticks are used as an example here, the same applies to incense burning and candles.

[0052] Therefore, by preparing incense sticks, incense, and candles from the manufacturers and brands that are commonly used at the temple where the device is installed and having the device learn the odors of these, the accuracy of odor detection can be further improved by taking into account the odors of all the manufacturers and brands that are commonly used.

[0053] The smoke detection standard applies to all smoke detection devices other than photoelectric spot detectors, such as photoelectric separation detectors, ionization spot detectors, suction smoke detectors, and image surveillance smoke detectors.

[0054] Furthermore, in order to detect odors over a wide range of odor component concentrations, multiple types of transducers with different sensitivities may be provided in the odor detection unit 2. In this case, multiple types of sensitive films are provided for each transducer.

[0055] Furthermore, instead of or in addition to the odors of incense, burning incense, and candles, the odor patterns of various brands of cigarettes may be learned as the odor detection target patterns, and the learned data may be used. This allows the first embodiment to be applied to smoking rooms as well.

[0056] Furthermore, instead of or in addition to the odors of incense, burning incense, and candles, odor detection unit 2 can be used to learn in advance the odor patterns of soap, shampoo, body wash, and other detergents used when bathing. This learned data can then be stored in control unit 3 of fire alarm 10 and installed in guest rooms of lodging facilities. This prevents smoke detection unit 1 from falsely reporting a fire even if it detects water vapor after bathing.

[0057] As in the above examples, by customizing the detection target pattern according to the installation location, the fire alarm 10 can perform detection operations according to the installation location. That is, odors that may cause a false detection by the smoke detection unit 1, which are different from the odor of smoke caused by a fire, such as the odor of incense, burning incense, and candles, the odor of tobacco, and the odor of detergents such as shampoo and body soap, can be learned in advance as odor detection target patterns according to the installation location.

[0058] Alternatively, instead of learning the odor patterns for identifying the cause of false detection, the odor identification unit 3B may learn the odor pattern of smoke caused by a fire, which is the target of detection. In this case, the odor identification unit 3B normally turns off the output of the permission signal, and turns on the permission signal when it detects the odor of smoke caused by a fire, which is the target of detection.

[0059] 3, the alarm command signal is turned on when the target odor is detected, and turned off when the target odor is not detected. In other words, by taking into account the AND condition that the odor of smoke caused by a fire is detected in addition to the detection of smoke by the smoke detection unit 1, it is possible to reduce false alarms regarding the occurrence of a fire.

[0060] In addition, the system may be configured to learn both the odor pattern of smoke caused by a fire and the pattern for identifying the cause of false detection, and to switch between the two learned data. In this case, the output contents of the permission signal (ON and OFF) are also switched between the ON and OFF states.

[0061] Furthermore, when the odor of smoke caused by a fire is to be detected, instead of controlling the on / off of the permission signal, the smoke detection sensitivity of the smoke detection unit 1 may be adjusted. In this case, the control unit 3 can set the smoke detection sensitivity to a high level when the odor of smoke caused by a fire is detected.

[0062] As a result, it is possible to prevent the possibility of false detection from increasing due to constantly increasing the detection sensitivity, while once the smell of smoke caused by a fire is detected, the detection sensitivity can be increased to enable the smoke detection unit 1 to quickly detect smoke.

[0063] In the above-mentioned embodiment 1, a specific example was described in which a sensor having multiple types of sensitive membranes is used as the odor detection unit, and the odor pattern detected by each sensitive membrane is output as an odor detection signal. However, the odor detection unit according to the present disclosure is not limited to sensors having such a configuration with multiple types of sensitive membranes.

[0064] For example, the following semiconductor sensor can be used as the odor detection unit. A semiconductor sensor uses a method that utilizes the change in the resistance value of a semiconductor due to the adsorption and surface reaction of odor molecules on the semiconductor surface. On the top surface of the sensor unit, an oxide semiconductor SnO2 (tin oxide), which is a gas-sensitive material, is formed on an alumina substrate. Meanwhile, a heater for heating is attached to the bottom surface of the sensor unit.

[0065] When placed in clean air, oxygen is adsorbed onto the surface of the gas sensing element. Because oxygen has electron affinity, it captures electrons in the gas sensing element. This impedes the flow of electrons, increasing the electrical resistance inside the gas sensing element.

[0066] On the other hand, when placed in an odorous gas, an oxidation reaction occurs between the odorous gas and the adsorbed oxygen on the surface of the gas sensing element, and the adsorbed oxygen is removed, which makes the electrons more mobile and reduces the electrical resistance.

[0067] Most odor molecules are reducing gases, and when the gas comes into contact with the gas-sensing element, the electrical resistance decreases. Therefore, the electrical resistance changes depending on the odor molecules contained in the air, and by converting the change in electrical resistance into a voltage and using this value as an odor detection signal, odors can be electrically identified and detected.

[0068] In other words, the odor detection unit according to the present disclosure can be any type that can detect odors generated in a monitored area and output a physical quantity corresponding to the detected odor as an odor detection signal, and an odor detection unit of a desired type can be adopted depending on the installation site, application, etc. It is also possible to use multiple types of odor detection units in combination.

[0069] In the method using multiple sensitive films, the ability to distinguish between odors can be improved by increasing the number of types of sensitive films and adopting odor patterns based on a larger number of channels.In addition, when using a semiconductor sensor, there is the advantage that the influence of humidity can be greatly reduced because it is heated by a heater.

[0070] The features of the fire alarm 10 can be summarized as follows: the fire alarm 10 has the following configuration and can achieve the following effects.

[0071] Fire alarm 10 includes a smoke detection unit 1 that outputs a smoke detection signal when smoke is detected, and an odor detection unit 2 that detects odors and outputs a physical quantity corresponding to the detected odor as an odor detection signal. Fire alarm 10 also includes an alarm transmission unit 4 that issues an alarm that a fire has occurred, and a control unit 3 that controls the transmission of an alarm by alarm transmission unit 4 based on the smoke detection signal from smoke detection unit 1 and the odor detection signal from odor detection unit 2.

[0072] Additionally, the control unit 3 pre-stores odor-related physical quantities as odor detection target patterns for identifying the cause of erroneous detection by the smoke detection unit 1. When a smoke detection signal is output from the smoke detection unit 1, the control unit 3 monitors the odor detection signal output from the odor detection unit 2. If the odor detection target pattern is detected in the odor detection signal, the control unit 3 inhibits the alarm transmission unit 4 from issuing an alarm, and if the odor detection target pattern is not detected in the odor detection signal, the control unit 3 causes the alarm transmission unit 4 to issue an alarm.

[0073] By adopting a fire alarm 10 having such a configuration, when smoke is detected, alarm activation can be controlled according to the odor occurring in the surrounding area. In addition, by providing multiple types of sensitive membranes, multiple types of odors can be distinguished and detected, improving detection accuracy. This reduces false alarms regarding the occurrence of a fire.

[0074] The odor detection target patterns stored in the control unit 3 are learned data that have been previously learned using the odor detection unit 2 to identify odor patterns that are different from the odor of smoke caused by a fire and that are used to identify causes of erroneous detection by the smoke detection unit 1. The control unit 3 uses the learned data to determine whether or not the odor detection target pattern has been detected in the odor detection signal.

[0075] By obtaining such a fire alarm 10, it is possible to control alarm activation by taking into account odors that are a cause of false detection depending on the installation location, thereby reducing false alarms regarding the occurrence of fires in various installation environments. [Explanation of symbols]

[0076] 1 Smoke detection unit, 2 Odor detection unit, 3 Control unit, 3A Alarm control unit, 3B Odor identification unit, 4 Alarm unit, 10 Fire alarm.

Claims

1. a smoke detection unit that outputs a smoke detection signal when it detects smoke; an odor detection unit that detects an odor and outputs a physical quantity corresponding to the detected odor as an odor detection signal; an alarm unit that issues a fire alarm; a control unit that controls the alarm generation unit to generate an alarm based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit; Equipped with the control unit stores in advance the physical quantities related to odors for identifying factors causing erroneous detection by the smoke detection unit as odor detection target patterns; the control unit monitors the odor detection signal output from the odor detection unit when the smoke detection signal is output from the smoke detection unit; When the odor detection target pattern is detected in the odor detection signal, the alarm issuing unit is inhibited from issuing an alarm; If the odor detection target pattern is not detected in the odor detection signal, the alarm is generated by the alarm generating unit. The odor detection target pattern stored in the control unit is learned data obtained by previously learning odor detection signals corresponding to each odor in order to identify causes of erroneous detection using the odor detection unit, The control unit uses the learned data to determine whether the odor detection target pattern is detected in the odor detection signal.

2. a smoke detection unit that outputs a smoke detection signal when it detects smoke; an odor detection unit that detects an odor and outputs a physical quantity corresponding to the detected odor as an odor detection signal; an alarm unit that issues a fire alarm; a control unit that controls the alarm generation unit to generate an alarm based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit; Equipped with The control unit stores in advance the physical quantities related to odors for identifying smoke caused by a fire by the smoke detection unit as an odor detection target pattern, the control unit monitors the odor detection signal output from the odor detection unit when the smoke detection signal is output from the smoke detection unit; If the odor detection target pattern is not detected in the odor detection signal, the alarm issuing unit is inhibited from issuing an alarm; When the odor detection target pattern is detected in the odor detection signal, the alarm is generated by the alarm generating unit. The odor detection target pattern stored in the control unit is learned data obtained by previously learning, using the odor detection unit, odor detection signals corresponding to each odor for identifying smoke caused by a fire, The control unit uses the learned data to determine whether the odor detection target pattern is detected in the odor detection signal.

3. a smoke detection unit that outputs a smoke detection signal when it detects smoke; an odor detection unit that detects an odor and outputs a physical quantity corresponding to the detected odor as an odor detection signal; an alarm unit that issues a fire alarm; a control unit that controls the alarm generation unit to generate an alarm based on the smoke detection signal from the smoke detection unit and the odor detection signal from the odor detection unit; Equipped with The control unit stores in advance the physical quantities related to odors for identifying smoke caused by a fire by the smoke detection unit as an odor detection target pattern, the control unit monitors the odor detection signal output from the odor detection unit; When the odor detection target pattern is detected in the odor detection signal, the smoke detection sensitivity of the smoke detection unit is increased.

4. The odor detection unit includes a plurality of types of sensitive films, and outputs the odor pattern detected by each of the sensitive films as the odor detection signal. The fire alarm according to any one of claims 1 to 3.

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