JP2010224854A - Alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm for detecting a failure earlier during a period from night to early morning. <P>SOLUTION: The alarm includes: a fire detection unit 5 which detects a fire in a monitoring area; a control unit (microcomputer 10) which receives a detection signal output from the detection unit 5 in a predetermined sampling cycle, determines occurrence of a failure when the value of the received detection signal keeps an abnormal threshold or more until a predetermined accumulation time passes, and outputs a warning; and a clock unit 12. The control unit (microcomputer 10) sets, when the time shown by the clock unit 12 is within a preset failure detection early time zone, the predetermined accumulation time shorter than that in the time zone other than the failure detection early time zone. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an alarm device.

  Conventionally, as an example of an alarm device, a fire alarm device that detects an abnormality in a monitoring area such as a fire and sounds an alarm sound has been used. Among such fire alarms that detect smoke, “light emitting element 4 is driven to emit light intermittently” and “light receiving element 5 emits scattered light caused by smoke passing between light emitting element 4”. "Receiving light" and "detecting a fire by inputting a signal output from the light receiving element 5 and comparing the level of this signal with a preset fire judgment level" (see, for example, Patent Document 1) ).

Japanese Utility Model Publication No. 05-092892 (page 8, FIG. 3)

  As in the technique described in Patent Document 1, in an alarm device that intermittently captures the detection signal of the abnormality detection unit at a predetermined sampling period and determines whether there is an abnormality, the detection signal is abnormal for a predetermined time or more. Some are judged abnormal when the threshold value is exceeded. By doing in this way, it is suppressed that an error arises in judgment.

  By the way, when an abnormality is detected and an alarm is given, the user needs to evacuate quickly, but it takes more time to recognize the alarm in the bedtime than in the daytime. For this reason, there is a possibility that the evacuation behavior may be delayed in the sleeping hours compared to the daytime hours, and it is desirable to detect an abnormality as early as possible.

  The present invention has been made to solve the above-described problems, and provides an alarm device that can detect an abnormality early, for example, in a time zone from night to early morning.

  An alarm device according to the present invention includes an abnormality detection unit that detects an abnormality in a monitoring region, and a detection signal output from the abnormality detection unit at a predetermined sampling period. The value of the acquired detection signal is a predetermined accumulation time. A control unit that determines that an abnormality has occurred and outputs an alarm when it is equal to or greater than the abnormality threshold until the time elapses, and a clock means, and the control unit includes the clock If the time indicated by the means is within a preset early abnormality detection time zone, the predetermined accumulation time is set shorter than outside the early abnormality detection time zone.

  Further, the control unit sets a sampling period for capturing the detection signal to be shorter than the predetermined sampling period after the value of the captured detection signal becomes equal to or greater than the abnormality threshold value.

  In addition, when an abnormality detection unit that detects an abnormality in the monitoring region and a detection signal output from the abnormality detection unit are captured at a predetermined sampling period, and the value of the captured detection signal is equal to or greater than an abnormality threshold, an abnormality is detected. A control unit that determines that the alarm has occurred and outputs an abnormality alarm; and a clock unit, and the control unit is configured so that the time indicated by the clock unit is within a preset early abnormality detection time period. The sampling period for capturing the detection signal is set shorter than outside the early abnormality detection time period.

  Further, the control unit determines that an abnormality has occurred and issues an abnormality alarm when the value of the captured detection signal is continuously equal to or greater than the abnormality threshold until a predetermined accumulation time elapses. The control unit, after the value of the captured detection signal becomes equal to or greater than the abnormality threshold, sets a sampling period for capturing the detection signal to be shorter than a sampling period within the early abnormality detection time zone. It is to set.

  The alarm device according to the present invention includes a setting unit that sets the early abnormality detection time zone.

  In addition, the alarm device according to the present invention is configured such that the abnormality is detected when a time point indicated by the time signal means and a time signal circuit that outputs a time signal to an external device is within a preset early abnormality detection time zone. A transfer control means for outputting a transfer signal from the transfer circuit when it is determined that the transfer has occurred.

  In the present invention, if the time is within a preset early abnormality detection time zone, the accumulation time until it is determined that an abnormality has occurred and an abnormality alarm is output is set short. For this reason, for example, if a bedtime period is set as an early abnormality detection period, a fire can be detected earlier during that period.

  In the present invention, if the time is within the preset early abnormality detection time zone, the sampling cycle for capturing the detection signal is set shorter than outside the early abnormality detection time zone. For this reason, for example, if a bedtime period is set as an early abnormality detection period, a fire can be detected earlier during that period.

  In addition, after the value of the captured detection signal becomes equal to or greater than the abnormal threshold, the sampling cycle for capturing the detection signal is set short. For this reason, it is possible to accurately determine whether or not an abnormality has occurred.

  Moreover, since the setting part which sets an early abnormality detection time slot | zone is provided, an early abnormality detection time slot | zone can be arbitrarily set according to a user's lifestyle.

  In addition, when it is determined that an abnormality has occurred when the time is within a preset early abnormality detection time zone, a transmission signal is output from the transmission circuit. For this reason, it is possible to appropriately cope with the abnormality in conjunction with an external device or the like that has received the transfer signal.

It is a circuit block diagram which shows the internal circuit of the fire alarm which concerns on Embodiment 1 of this invention. 3 is a flowchart showing a main operation of the fire alarm device according to the first embodiment. 4 is a flowchart illustrating an accumulation number setting operation of the fire alarm device according to the first embodiment. 3 is a flowchart showing a fire monitoring operation of the fire alarm device according to the first embodiment. 4 is a flowchart showing a fire output operation of the fire alarm device according to the first embodiment. It is a figure explaining the sampling operation | movement of the fire detection of the fire alarm which concerns on Embodiment 1. FIG. 6 is a flowchart showing a main operation of the fire alarm according to the second embodiment. 6 is a flowchart illustrating an operation of setting a normal sampling period of a fire alarm device according to a second embodiment. It is a figure explaining the sampling operation | movement of the fire detection of the fire alarm which concerns on Embodiment 2. FIG.

Embodiment 1 FIG.
There are various alarm devices such as a fire alarm device and a gas leak alarm device. In addition, fire alarms include a fire alarm that detects smoke with a light emitting element and a light receiving element, a fire alarm that detects heat with a thermal element, and a fire alarm that detects flame with a pyroelectric element. An alarm is present. In the present embodiment, a case where the present invention is applied to a fire alarm device that detects heat by a thermistor that is a thermal element will be described as an example.

  FIG. 1 is a circuit configuration diagram showing main internal circuits of the fire alarm 100 according to the first embodiment. The fire alarm 100 includes a battery 1, a power monitoring circuit 2, a fire detection unit 5, a microcomputer 10 as a control unit (hereinafter referred to as a microcomputer 10), an alarm unit 23 that performs a sound alarm, and an external device 200. The output transfer circuit 20 is the main component.

(Microcomputer)
The microcomputer 10 includes a storage unit 11 that stores various flags and data, a clock unit 12, a setting unit 13, and an audio data memory 14. The microcomputer 10 controls various operations of the fire alarm device 100 by a CPU (not shown) according to a control program stored in a ROM (not shown).

  The storage unit 11 is configured by a rewritable nonvolatile memory such as an EEPROM. The storage unit 11 stores a fire flag 11a, a night time zone 11b, and a specified accumulation count M11c that are set when a fire is detected. The night time zone 11b is a time zone for detecting the occurrence of fire earlier, and corresponds to the early abnormality detection time zone of the present invention. In the following description, a time zone other than the night time zone is referred to as a daytime time zone. The specified accumulation count M11c will be described later.

  The clock unit 12 is a time measuring device that measures time, and holds the current time. Note that a radio timepiece that receives a standard radio wave can be used as the clock unit 12, and an accurate time can be measured in this way.

The setting unit 13 is a circuit that sets a night time zone. The setting unit 13 is connected to a setting switch (not shown) provided in the housing of the fire alarm 100, and sets a night time zone according to an input to the setting switch. The night time zone can be set by designating a start time (for example, 23:00) and an end time (for example, 06:00). Alternatively, the start time (for example, 23:00) and the time until the end (for example, 7 hours) may be designated.
As the setting switch, for example, a DIP switch capable of setting “hour” and “minute” can be provided at a position where the user of the casing of the fire alarm device 100 can operate.

  The audio data memory 14 is a memory for storing audio data output from the alarm unit 23, and is constituted by a ROM. The sound data memory 14 stores sound data of fire sound that is output when the fire alarm 100 detects a fire.

(battery)
For example, the battery 1, which is a lithium battery, is a power source that constantly supplies power to the microcomputer 10 and the like via the constant voltage circuit 4. The battery 1 can supply stable power to the microcomputer 10 and the like through the constant voltage circuit 4.

(Voltage drop detection means)
The fire alarm 100 monitors the voltage drop of the battery 1. Specifically, when the microcomputer 10 turns on the switch 3, the power supply monitoring circuit 2 is driven, and the power supply monitoring circuit 2 detects the voltage value of the battery 1. The power supply monitoring circuit 2 outputs the detected voltage value to the microcomputer 10, and the microcomputer 10 determines that the voltage of the battery 1 has dropped if the detected voltage value is equal to or lower than a predetermined determination level. Alarm action is performed. The alarm can be stopped by operating the voice stop switch 8.

(Alarm part)
The alarm unit 23 is a circuit that issues an alarm by sounding sound, includes a speaker 25 and an amplifier 24, and is connected to the constant voltage circuit 4 via the switch 22. When the microcomputer 10 turns on the switch 22, power is supplied to the alarm unit 23, and the amplifier 24 amplifies the audio signal output from the audio data memory 14 of the microcomputer 10 and outputs it to the speaker 25. In this way, the alarm unit 23 performs an alarm by sounding sound. Since the switch 22 is turned on and power is supplied to the alarm unit 23 only when an alarm is given, current consumption can be reduced.
In the first embodiment, the alarm unit 23 performs only an alarm by sounding sound. However, for example, a display lamp or the like may be provided and a visual alarm by a display lamp may be performed.

(Audio stop switch)
The voice stop switch 8 is a switch for stopping the alarm by the alarm unit 23, and is provided at a position where the user of the casing of the fire alarm device 100 can operate. As the voice stop switch 8, for example, a push button type switch can be used. The signal from the voice stop switch 8 is input to the microcomputer 10.

(Transport means)
The transfer circuit 20 is a circuit that outputs a transfer signal to the external device 200 and is controlled by the microcomputer 10. Examples of the external device 200 include an alarm buzzer installed in another room and a residential receiver. The external device 200 is provided with, for example, a notification device for the fire engine, and the external device 200 that has received the transfer signal can notify the fire engine that the fire alarm has been issued. Can do. The transfer control means of the present invention corresponds to the microcomputer 10 in the first embodiment.

(Fire detection part)
The fire detection unit 5 is a thermal fire detection unit including a thermistor 6 and a resistor 7. The thermistor 6 and the resistor 7 are connected in series, and a constant voltage is applied from both ends of the thermistor 6 and the resistor 7 via the constant voltage circuit 4. Further, the tip of the thermistor 6 is provided near the surface of the housing of the fire alarm 100. This facilitates the transfer of heat during a fire to the thermistor 6.

  The microcomputer 10 receives a voltage divided by a resistance ratio by the thermistor 6 and the resistor 7. Since the resistance value of the thermistor 6 changes depending on the temperature, when the thermistor 6 is warmed during a fire, the voltage value between the thermistor 6 and the resistor 7 changes. The microcomputer 10 samples a voltage value (hereinafter referred to as a detection voltage value) between the thermistor 6 and the resistor 7 at a predetermined period, and the sampled detection voltage value continues until a predetermined accumulation time elapses. If the fire level (threshold) is exceeded, the fire occurrence is confirmed. Depending on whether or not it is a night time zone, the accumulation time from when the detected voltage value first becomes equal to or higher than the fire level until the fire occurrence is determined varies (details will be described later).

  There are two types of thermistors 6: a) a type in which the resistance value increases as the temperature rises, and b) a type in which the resistance value decreases as the temperature rises. Here, the b) type is used. . If the detected voltage value of the b) type thermistor 6 is equal to or higher than a fire level (for example, 2V), it is determined that a fire has occurred.

The fire alarm 100 configured as described above is installed on a ceiling surface of a residence or the like which is a monitoring area, and performs fire monitoring.
Next, the operation of the fire alarm 100 will be described.
FIG. 2 is a flowchart showing the main operation of the fire alarm device 100. First, the main operation of the fire alarm 100 will be described with reference to FIG. In the initial state, the night time zone 11b is in a state where nothing is set.

  When the battery 1 is loaded and the power is turned on (S1), the microcomputer 10 clears all the flags in the storage unit 11 (S2). The processing so far is the initial processing performed when the power is turned on, and thereafter, the series of processing from step S3 to step S6 is repeated.

  Subsequently, the night time zone set by the user in the setting unit 13 is read and stored in the night time zone 11b of the storage unit 11 (S3). Then, when a fire is detected, the number of times of accumulation for determining the fire is set (S4), and fire monitoring (S5) and fire output (S6) are sequentially performed. Details will be described below.

FIG. 3 is a flowchart showing the operation of setting the number of accumulations shown in step S4 of FIG.
The microcomputer 10 determines whether or not the current time indicated by the clock unit 12 is a night time zone (S41). If the current time is a night time zone, the microcomputer 10 stores the specified accumulation number M = 2 in the prescribed accumulation number M11c (S42). ). If it is not a night time zone, the specified accumulation count M = 5 is stored in the specified accumulation count M11c (S43).

Here, the specified accumulation count M is used as a criterion for determining the occurrence of a fire in the fire detection operation. Although details will be described later, if the sampled detected voltage value is a value equal to or greater than the prescribed accumulation count M (for example, 5 times or more) and a fire level or more, the fire occurrence is determined. Therefore, the accumulation time until the occurrence of a fire is determined is determined by the prescribed accumulation number M and the sampling period.
In the first embodiment, as shown in FIG. 3, the accumulation time until the fire is determined is changed by determining the prescribed accumulation number M depending on whether or not it is a night time zone, and the night time zone is changed from the day time zone. The storage time is shorter when.

FIG. 4 is a flowchart showing the operation of the fire monitoring process shown in step S5 of FIG.
FIG. 6 is a diagram for explaining the operation during the fire monitoring, and shows the operation until the occurrence of the fire is confirmed. In the following description, “normal” means that the detected voltage value is not equal to or higher than the fire level and no fire is detected, and other than normal is called “abnormal”.

First, the fire monitoring processing operation will be described along FIG. 4 with reference to FIG. 6 as appropriate.
In FIG. 4, the microcomputer 10 takes in the voltage value of the thermistor in the normal sampling cycle (S51). Then, the detected voltage value is compared with the fire level to determine whether or not a fire has occurred (S52). If it is determined that a fire has occurred, the number of times is counted as the number N of accumulation (S53). When a fire is detected for the first time (sampling T4 and T14 in FIG. 6), the number of accumulations N is not counted.

  Subsequently, the accumulation count N is compared with the specified accumulation count M (S54). If the current time is the night time zone, the prescribed accumulation count M is 2; if the current time is the daytime zone, the prescribed accumulation count M is 5 (see the settings in steps S42 and S43 in FIG. 3). If the accumulation count N is less than the specified accumulation count M (S54), the voltage value of the thermistor is captured at the sampling period for abnormal time (S55). Subsequently, the process returns to step S52, and the processes of steps S52, S53, S54, and S55 are repeated until the accumulation count N becomes equal to or greater than the specified accumulation count M.

  When the accumulation count N is equal to or greater than the specified accumulation count M (S54), the fire flag 11a is set (S56), the fire is confirmed, the accumulation count N is cleared, and (S58) is terminated. If a fire is not detected before the accumulation count N reaches the specified accumulation count M (No in S52), the fire flag 11a is cleared (S57), the accumulation count N is cleared (S58), and the process is terminated. .

  If it is determined in step S52 that no fire has been detected, the fire flag 11a is cleared (S57), the accumulation count N is cleared (S58), and the process is terminated.

Next, the fire monitoring operation described in FIG. 4 will be further described based on FIG.
FIG. 6A is a diagram showing the relationship between the fire level and the detected voltage value, and shows that the detected voltage value is equal to or higher than the fire level at the timing of P1.

FIG. 6B shows a sampling operation in the daytime time zone.
The fire alarm 100 performs sampling T1, T2, T3, and T4 at a normal sampling period (10 seconds) until the detected voltage value becomes equal to or higher than the fire level (see step S51 in FIG. 4). Then, when the detected voltage value becomes equal to or higher than the fire level at sampling T4, thereafter, sampling T5 to T9 is performed at an abnormal sampling period (2 seconds) (see step S55 in FIG. 4). At this time, since the detected voltage value is equal to or higher than the fire level in sampling T5 to T9, the number of accumulations N is counted. In the daytime period, the prescribed accumulation count M = 5, so that the fire is determined when the accumulation count N reaches the prescribed accumulation count M (5 times) (steps S52, S53, S54, S55, S56 in FIG. 4). reference). That is, since the detection voltage value has exceeded the fire level at sampling T4, the detection voltage value has continuously exceeded the fire level for a predetermined accumulation time (2 seconds x 5 accumulation times = 10 seconds). The fire has been confirmed.

Next, the fire detection operation in the night time zone will be described.
FIG. 6C shows a sampling operation in the night time zone.
The fire alarm 100 performs sampling T11, T12, T13, and T14 at a normal sampling period (10 seconds) as in the daytime period. Then, when the detected voltage value becomes equal to or higher than the fire level at sampling T14, thereafter, sampling T15 and T16 are performed at an abnormal sampling period (2 seconds). Since the detected voltage value is equal to or higher than the fire level at samplings T15 and T16, the number of accumulations is counted. In the night time zone, since the specified accumulation number M = 2, the fire is determined when the accumulation number N reaches the prescribed accumulation number M (2 times). That is, at the sampling T14, after the detected voltage value first becomes equal to or higher than the fire level, the detected voltage value continues to be equal to or higher than the fire level for a predetermined accumulation time (2 seconds × 2 accumulation times = 4 seconds). Therefore, the fire has been confirmed.

  Thus, in the night time zone, the accumulation time from when the detected voltage value becomes equal to or higher than the fire level to when it is determined that the fire is confirmed is set short. That is, the fire is determined at the time of sampling T9 in the daytime period, whereas the fire is determined at the time of sampling T16 in the nighttime period. For this reason, in the example of the first embodiment, the time from when the detected voltage value first becomes equal to or higher than the fire level until the fire is confirmed is shorter in the night time zone by up to 6 seconds than in the daytime time zone. .

FIG. 5 is a flowchart showing the fire output operation shown in step S6 of FIG.
The microcomputer 10 determines whether or not the fire flag 11a indicating whether or not a fire has occurred is set (S61).
When the fire flag 11a is set (S61), a fire sound indicating that a fire has occurred is output (S62). Then, it is determined whether or not the current time is a night time zone (S63), and if it is a night time zone, a fire report is output (S64). Specifically, the transfer circuit 20 is controlled to output a signal indicating that a fire has occurred to the external device 200. By doing so, it is possible to automatically report the occurrence of a fire during a time zone in which the user's response to a fire tends to be delayed, such as at night.
If it is not the night time zone (S63), the process is terminated without performing the fire report output. Since it is relatively easy for a user to respond to a fire during the daytime period, the user himself / herself can make a decision when making a report to the external device 200.

  As described above, the fire alarm device 100 performs fire monitoring by repeating the processes of steps S3 to S6 shown in FIG. 2, and performs a warning by fire sound when a fire is detected. In addition, by setting the accumulation time until the occurrence of fire is confirmed to be shorter than the daytime time zone during the nighttime zone, the fire alarm is given earlier than the daytime time zone.

  As described above, according to the fire alarm device 100 according to the first embodiment, in the night time zone, it is possible to detect the fire by reducing the number of times of sampling until the fire is determined after the fire is detected. The accumulation time from fire to fire confirmation was set short. For this reason, fire detection can be performed earlier, and prompt evacuation action can be promoted even at night when the user's response tends to be delayed.

  In addition, after the detected voltage value becomes equal to or higher than the fire level, the detected voltage value is sampled at a cycle (2 seconds) shorter than the normal sampling cycle (10 seconds). For this reason, it is possible to accurately determine whether or not there is a fire.

  In addition, a setting unit 13 that allows the user to set the night time zone is provided. For this reason, the night time zone (early abnormality detection time zone) can be set according to the lifestyle of the user.

  In addition, when a fire occurrence is detected during the night time, a report is automatically output to the external device 200. For this reason, if a notification device for the fire engine, for example, is connected to the external device 200, it is possible to automatically notify the fire engine when a fire alarm is issued at night time. Further, during the daytime period, even when a fire alarm is issued, the transfer output to the external device 200 is not automatically performed. For this reason, the user can determine himself / herself whether or not to output the report.

Embodiment 2. FIG.
In the first embodiment described above, the case where the normal sampling period until the fire is detected is the same in the daytime time zone and the nighttime zone has been described as an example. In the second embodiment, an example will be described in which the normal sampling period is shorter than the daytime time period in the nighttime period.
In addition, the same code | symbol is attached | subjected to the component which is the same as that of above-mentioned Embodiment 1, or respond | corresponds, and it demonstrates centering on a different point from Embodiment 1. FIG.

First, the operation of the fire alarm 100A according to the second embodiment will be described.
FIG. 7 is a flowchart showing the main operation of the fire alarm 100A, which is substantially the same as that of FIG. 2 described above, but differs only in step S4A. In step S4A, the normal period sampling period is set.

FIG. 8 is a flowchart showing an operation of setting a normal sampling period shown in step S4A of FIG.
The microcomputer 10 determines whether or not the current time is a night time zone (S41A), and if it is a night time zone, sets the normal sampling period to 5 seconds (S42A) and ends the processing. If the current time is not a night time zone, the normal sampling period is set to 10 seconds (S43A), and the process ends.
That is, in the night time zone, the detection voltage value is sampled at a cycle shorter than the day time zone.

  Then, the fire alarm device 100A performs fire monitoring by repeating the processes of steps S3, S4A, S5, and S6 shown in FIG. 7, and issues a warning by fire sound when a fire is detected.

FIG. 9 is a diagram for explaining the operation during fire monitoring of the fire alarm device 100A according to the second embodiment, and shows the operation until the occurrence of a fire is confirmed.
As shown in FIG. 9B, the fire detection operation in the daytime period is the same as that described in the first embodiment.

  FIG. 9C shows a sampling operation in the night time zone. In the night time zone, the detection voltage value is sampled at the normal sampling period set to 5 seconds. When the detected voltage value becomes equal to or higher than the fire level in sampling T26, thereafter, sampling T27 to T31 is performed every 2 seconds that is the abnormal sampling period. Since the detected voltage value is equal to or higher than the fire level in sampling T27 to T31, the number of accumulations N is counted, and the fire is determined when the number of accumulations N reaches the specified accumulation number M (5 times).

  In this way, in the night time zone, the normal sampling cycle is shorter than the normal sampling cycle in the day time zone. For this reason, in the example of the second embodiment, the time until the fire occurrence is confirmed in the night time zone is 5 seconds earlier than the day time zone.

  As described above, according to the fire alarm device 100A according to the second embodiment, the normal sampling period is set shorter in the night time zone than in the day time zone. For this reason, fire detection can be performed earlier, and prompt evacuation action can be promoted even at night when the user's response tends to be delayed.

  In addition, after the first detection of the fire, the detection voltage value is sampled at a cycle (2 seconds) shorter than the normal sampling cycle (10 seconds). For this reason, it is possible to accurately determine whether or not there is a fire.

Note that the values of the sampling period and the number of times of accumulation (accumulation time) in the above description are examples, and these values can be arbitrarily determined according to the installation environment of the alarm device, the detection target, and the like.
In the above-described sampling at the time of abnormality during fire monitoring, it has been described that the occurrence of a fire is determined when the detected voltage value exceeds the fire level continuously for a specified accumulation number M or more. There is no need. For example, it is assumed that the detected voltage value is detected as “fire level or higher, fire level or higher, fire level or higher, less than fire level, fire level or higher,. In this case, instead of clearing the accumulation count N and recounting the accumulation count N when it becomes “below the fire level”, if the “below fire level” count is a predetermined number (for example, 1 time) or less, The accumulation count N can be cumulatively counted before and after that. That is, under a predetermined condition, it is possible to determine the occurrence of a fire on the assumption that the detected voltage value continuously exceeds the fire level even if it is discontinuous. Even if it does in this way, while being able to discriminate | determine accurately whether it is a fire, a fire detection can be performed earlier.

Further, the first embodiment and the second embodiment can be implemented in combination as appropriate.
In the above description, the fire detection unit has been described as an example of the abnormality detection unit. However, an abnormality in other monitoring area such as gas leakage may be detected. Moreover, although the heat detection by the thermistor 6 was demonstrated to the example as a fire detection part, you may use other fire detection parts, such as a smoke detection part.

  1 battery, 2 power monitoring circuit, 3 switch, 4 constant voltage circuit, 5 fire detection section, 6 thermistor, 7 resistance, 8 voice stop switch, 10 microcomputer, 11 storage section, 11a fire flag, 11b night time zone, 11c Accumulation count M, 12 Clock unit, 13 Setting unit, 14 Audio data memory, 20 Transfer circuit, 22 Switch, 23 Alarm unit, 24 Amplifier, 25 Speaker, 100, 100A Fire alarm, 200 External equipment.

Claims (6)

An anomaly detector that detects an anomaly in the monitoring area;
An abnormality occurs when the detection signal output from the abnormality detection unit is captured at a predetermined sampling period, and the value of the detected detection signal continuously exceeds the abnormality threshold until the predetermined accumulation time elapses. A control unit that determines that the alarm has occurred and outputs an abnormality alarm;
A clock means,
The controller is
If the time indicated by the clock means is within a preset early abnormality detection time zone, the predetermined accumulation time is set shorter than outside the early abnormality detection time zone. The control unit sets a sampling period for capturing a detection signal shorter than the predetermined sampling period after the value of the captured detection signal becomes equal to or greater than the abnormality threshold. Alarm. An anomaly detector that detects an anomaly in the monitoring area;
Control that captures the detection signal output from the abnormality detection unit at a predetermined sampling cycle, and outputs an abnormality alarm by judging that an abnormality has occurred when the value of the detected detection signal is equal to or greater than the abnormality threshold And
A clock means,
The controller is
If the time indicated by the clock means is within a preset early abnormality detection time zone, the sampling period for taking in the detection signal is set shorter than outside the early abnormality detection time zone. The control unit determines that an abnormality has occurred and outputs an abnormality alarm when the value of the captured detection signal is continuously greater than or equal to the abnormality threshold until a predetermined accumulation time elapses. Is,
The control unit sets a sampling period for capturing a detection signal shorter than a sampling period within the early abnormality detection time period after the value of the captured detection signal becomes equal to or greater than the abnormality threshold. The alarm device according to claim 3. The alarm device according to any one of claims 1 to 4, further comprising a setting unit configured to set the early abnormality detection time zone. A transfer circuit that outputs a transfer signal to an external device;
If it is determined that the abnormality has occurred when the time indicated by the clock means is within a preset early abnormality detection time zone, a transition signal is output from the transition circuit. The alarm device according to any one of claims 1 to 5, further comprising an information control means.

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