JP2013065332A - Alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm which can be made easy to identify sound generated from home electronics or the like inside a room and out-of-battery alarm sound or the like from the alarm.SOLUTION: A fire alarm 100 is configured so that when a smoke detection part 20 or a heat detection part 30 is determined as being abnormal, or when a battery voltage monitoring circuit 60 determines as being voltage drop, a control part 10 starts to drive a sounding component and a display lamp, and driving number of times of the display lamp is set larger than the driving number of times of the sounding component.

Description

  The present invention relates to an alarm device, and more particularly to a battery exhaustion alarm issued from the alarm device.

  As a conventional technique, for example, “the voltage monitoring unit 17B is configured to input a detection signal to the control unit 15B when the voltage decreases to a voltage indicating the consumption of the battery B. The control unit 15B performs the same control as the control unit 15. A warning device is proposed that has a function and controls the execution of blinking of the display lamp 13 and sounding of a warning sound by the alarm buzzer 12 or both in response to the input of the battery B consumption detection signal from the voltage monitoring unit 17B. (For example, refer to Patent Document 1).

JP 2007-226586 A (page 9, FIG. 4)

  In the alarm device disclosed in Patent Document 1, the alarm sound emitted from the alarm device is similar to the sound generated from home appliances in the room, and it is difficult to identify the alarm sound. Since the blinking of the indicator lamp is controlled only once every few minutes, there is a problem that when multiple alarm devices are installed, it is not possible to identify which alarm device is outputting an alarm indicating battery consumption. there were.

  The present invention has been made in order to solve the above-described problems, and makes it easy to distinguish between a sound generated from a home electric appliance in a living room and a battery exhausted alarm sound from an alarm device, and a battery exhausted alarm. An object of the present invention is to provide an alarm device that makes it easy to identify an alarm device that is outputting.

  An alarm device according to the present invention includes a power supply unit, a state detection unit, a voltage monitoring unit that monitors a supply voltage from the power supply unit, and a state determination unit that determines a state based on an output signal of the state detection unit. In addition, in the alarm device including a control unit that outputs an alarm based on the determination result of the state determination unit, and a sound generation component and an indicator lamp that are driven by a control signal of the control unit, the state determination unit determines that it is abnormal Or when the voltage monitoring unit determines that the voltage has dropped, the control unit starts driving the sound producing component and the indicator lamp almost simultaneously, and the number of times the display lamp is driven is determined by the number of times the sound producing component is driven. A lot.

  In the present invention, the alarm for the alarm device running out of battery power, etc., after the alarm sound and the indicator lamp lighting are output almost simultaneously, the number of times the indicator lamp lighting is driven is greater than the number of times the sounding part ring is driven. Since the output form is repeated at a predetermined timing, it is easy to grasp that the alarm device has output an abnormality alarm.

It is a functional block diagram which shows the circuit structure of the fire alarm device 100 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the internal structure of the control part 10 which concerns on Embodiment 1 of this invention. (a) It is a time chart of the battery exhaustion alarm operation | movement of the conventional fire alarm device. (b) It is a time chart of battery low alarm operation | movement of the fire alarm device 100 which concerns on Embodiment 1 of this invention. It is an example of the flowchart of the battery low alarm process of the fire alarm device 100 which concerns on Embodiment 1 of this invention. It is another example of the flowchart of the battery low alarm process of the fire alarm device 100 which concerns on Embodiment 1 of this invention. 6 is a time chart of an alarm operation in the battery exhaustion alarm process of FIG. 5.

Embodiment 1 FIG.
Hereinafter, in the first embodiment, a case where the present invention is applied to a fire alarm device driven by a battery will be described as an example.
FIG. 1 is a functional block diagram showing a circuit configuration of a fire alarm 100 according to Embodiment 1 of the present invention.
In FIG. 1, a fire alarm 100 includes a control unit 10 including a state determination unit, a battery 1, a constant voltage circuit 2, an inspection switch 3, an EEP-ROM 4, and a smoke detection unit that functions as a state detection unit. 20 and a heat detection unit 30, an alarm sound control circuit 40, an indicator lamp circuit 50, and a battery voltage monitoring circuit 60 functioning as a voltage monitoring unit.

  The control unit 10 is composed of a one-chip microcomputer or the like, and performs overall control of the fire alarm device 100. The control unit 10 periodically takes in signals from each internal circuit and performs processing according to the signals. For example, when the control unit 10 takes in a signal (fire detection signal) from the light receiving amplifier 23 of the smoke detection unit 20, it is determined whether or not an alarm is necessary based on the fire detection signal. When the control unit 10 captures the fire detection signal and determines that the alarm sound is necessary, the control unit 10 outputs the sound data of the alarm sound to the alarm sound control circuit 40.

  The internal configuration of the control unit 10 will be described later with reference to FIG. 2, but the control unit 10 stops the supply of the clock signal from the main clock oscillation unit 16 when waiting for the abnormality monitoring operation or the fire monitoring operation, It operates in a sleep mode that operates only by supplying a clock signal from the clock oscillator 17. However, when there is a periodic timer interrupt, a check switch interrupt or the like, the control unit 10 stops the sleep mode and supplies the clock signal of the main clock oscillation unit 16 to perform a necessary operation.

  The constant voltage circuit 2 supplies the power supply voltage of the battery 1 to the control unit 10 or the like as a predetermined constant voltage power supply (for example, a voltage of about 2.3 V). The inspection switch 3 receives a pressing operation by a user such as a resident. When the inspection switch 3 is pressed, the control unit 10 captures a pressing signal of the inspection switch 3 and determines whether or not the input of the inspection switch 3 is confirmed. When the control unit 10 determines that the input of the inspection switch 3 has been confirmed, the control unit 10 transmits a signal for starting an inspection related to an operation such as an alarm sound or an indicator light. The EEP-ROM 4 stores programs executed by the calculation unit 11 of the control unit 10 and various data.

  The smoke detection unit 20 includes an infrared LED 24 that is a light emitting element, and an infrared LED drive circuit 21 that supplies a current pulse to the infrared LED 24 when receiving a light emission control pulse from the control unit 10. Further, the smoke detector 20 includes a light receiving element such as a photodiode (PD) that receives scattered light caused by smoke particles generated by the light emitted from the infrared LED 24 to the smoke detector (not shown). Light scattered by the light emitted from the outer LED 24 is received. Then, the photodiode current-voltage conversion circuit 22 converts the current obtained based on the amount of scattered light received by the photodiode into a voltage. The output level of the voltage is amplified with a predetermined gain in the light receiving amplifier 23 and transmitted to the control unit 10.

  The heat detection unit 30 includes a temperature sensor that includes a fixed resistor 31 and a thermistor 32. An intermediate potential between the fixed resistor 31 and the thermistor 32 is an output terminal of the heat detection unit 30, and a temperature detection signal is transmitted to the control unit 10 via the output terminal. The thermistor 32 has a temperature characteristic that its resistance value varies according to the environmental temperature. Since the temperature characteristic of the thermistor 32 is linearized by the compensation fixed resistor 31, a detection voltage (temperature information) corresponding to the environmental temperature is input to the output terminal. In addition, in this Embodiment, although shown about the example which provided both the smoke detection part 20 and the heat detection part 30, you may make it provide only any one in this invention.

  The alarm sound control circuit 40 includes an audio D / A converter 41 having a low-pass filter, an audio amplifier 42 and a speaker 43 as sounding components. The low-pass filter plays a role of adjusting the audio data transmitted from the control unit 10 in advance to a frequency band that is easy for the user to listen to.

  In the alarm sound control circuit 40, the sound data (digital signal) input from the control unit 10 is converted into a sound signal (analog signal) by the sound D / A converter 41 and output through a low-pass filter. Then, a volume control signal is transmitted from the control unit 10 to the audio amplifier 42, and the audio amplifier 42 adjusts the amplification degree of the audio signal (analog signal). The speaker 43 outputs the audio signal amplified by the audio amplifier 42.

  The indicator lamp circuit 50 displays the state of the fire alarm 100 on the red LED 52 connected to the confirmation lamp drive circuit 51. In addition, as a state of the fire alarm device 100, when the fire detection operation is normally performed (a fire is not detected and there is no abnormality in the remaining battery level or sensor device), the remaining battery level is low. There are cases where there is an abnormality caused by the device, an abnormality caused by a device such as a sensor failure, and a case where a fire is detected and an alarm is output. The red LED 52 is provided in the housing of the fire alarm 100. In addition, although red LED52 is used as an indicator lamp, the kind and number are not specifically limited.

  The battery voltage monitoring circuit 60 detects a voltage applied to the control unit 10 and outputs a battery voltage detection signal corresponding to the detected voltage to the control unit 10. The battery voltage monitoring circuit 60 outputs a battery voltage detection signal to the control unit 10 when detecting that the remaining battery level has dropped or has fallen below the threshold value for running out of the battery, and the control unit 10 sends an alarm sound control circuit 40 to the alarm sound control circuit 40. A control signal for sounding an alarm sound “PIPO” is transmitted, and a control signal for blinking the indicator lamp is transmitted to the indicator lamp circuit 50.

FIG. 2 is a block diagram illustrating an internal configuration of the control unit 10.
Based on FIG. 2, the main internal structure of the control part 10 is demonstrated. The control unit 10 includes a calculation unit 11 that performs overall control of the operation of the fire alarm device 100, a ROM 12, a RAM 13, and the like as main circuits.

  The calculation unit 11 performs an abnormality monitoring operation and a fire monitoring operation for determining the occurrence of an abnormality and the occurrence of a fire based on various data transmitted from each circuit described above. That is, the calculation unit 11 serves as a state determination unit. The calculation unit 11 includes a CPU (central processing unit), an MPU (ultra-compact processing unit), and the like. The ROM 12 stores programs executed by the calculation unit 11 and various data. The RAM 13 functions as a memory such as a work memory or a page memory that temporarily stores various data when the arithmetic unit 11 executes a program.

  The arithmetic unit 11 includes a timer unit 14, an A / D converter 15, a main clock oscillating unit 16, a sub clock oscillating unit 17, via a bus (a conducting wire to which several power supplies or supply circuits are connected). The interface unit 18 and the counter 19 are connected.

  The timer unit 14 measures time. For example, the timer unit 14 measures the start timing of the abnormality monitoring operation and the fire monitoring operation that are periodically performed by the control unit 10. That is, an interrupt is periodically generated at the timing counted by the timer unit 14, and the arithmetic unit 11 is operated by the interrupt. In addition, the timer unit 14 measures the time from when the alarm sound is stopped, or measures the cycle of the blinking state of the red LED 52.

  The A / D converter 15 receives an analog signal transmitted from the smoke detection unit 20 or the heat detection unit 30, converts the information into a detection level, and supplies the detection level to the calculation unit 11. The calculation unit 11 determines whether an abnormality or a fire has occurred in the fire alarm device 100 based on this detection level.

The main clock oscillating unit 16 serves to supply the arithmetic unit 11 with a clock signal for executing an abnormality monitoring operation or a fire monitoring operation when a periodic timer interruption or an operation of the inspection switch 3 is performed.
The calculation unit 11 to which the clock signal from the main clock oscillation unit 16 is supplied collects data from each circuit, for example, fire detection data, battery voltage data, and the like, and based on these data, the occurrence of an abnormality is collected. Anomaly monitoring and fire monitoring operations are performed to determine the presence / absence and occurrence of fire. When the abnormality monitoring operation and the fire monitoring operation are finished, the arithmetic unit 11 switches the supply of the clock signal from the main clock oscillation unit 16 to the supply of the clock signal from the sub clock oscillation unit 17 and operates in the sleep mode.

  The sub clock oscillator 17 supplies a clock signal having a frequency lower than that of the clock signal supplied from the main clock oscillator 16 to the arithmetic unit 11. That is, the sub clock oscillating unit 17 supplies a clock signal that causes the computing unit 11 to operate at a low speed (sleep mode).

  The interface unit 18 has a function of connecting each circuit constituting the fire alarm device 100 to the control unit 10. That is, each circuit constituting the fire alarm device 100 is connected to the control unit 10 via the interface unit 18 and inputs / outputs various data.

  The counter 19 is a counter for taking a timing when performing a later-described battery exhaustion alarm process, and counts, for example, every second (see FIGS. 4 and 5 described later).

Next, the operation of the fire alarm 100 will be described. Here, a case where smoke is detected to determine whether or not a fire has occurred will be described as an example.
The fire alarm 100 sets the power supply voltage supplied from the battery 1 to a predetermined constant voltage (for example, a voltage of about 2.3 V) stabilized by the constant voltage circuit 2, and the constant voltage power is supplied to the control unit 10 and the like. . The fire alarm device 100 executes a fire monitoring operation and an abnormality monitoring operation at a predetermined cycle timed by the timer unit 14 included in the control unit 10. Next, the control unit 10 supplies a light emission control pulse to the infrared LED drive circuit 21 to cause the infrared LED 24 to emit light with a predetermined pulse width and a predetermined cycle.

  The photodiode in the smoke detector 20 is not arranged on the optical path of the infrared LED 24, and the light of the infrared LED 24 does not reach the photodiode directly. However, when smoke generated by a fire or the like is interposed between the photodiode and the infrared LED 24, the light of the infrared LED 24 is scattered by the smoke particles, and the photodiode receives the scattered light. .

  For the above reason, when no smoke is generated, the light emitted from the infrared LED 24 hardly reaches the photodiode. That is, since the signal amplified by the light receiving amplifier 23 is below a predetermined reference value (fire occurrence level), a signal for operating the alarm sound control circuit 40 and the indicator lamp circuit 50 is output from the control unit 10. Not. Therefore, the alarm sound control circuit 40 does not sound an alarm sound, and the indicator light circuit 50 does not cause the red LED 52 to indicate that a fire has occurred.

  When smoke is generated, the light emitted by the infrared LED 24 is scattered by the smoke particles, and the scattered light reaches the photodiode. That is, since the signal amplified by the light receiving amplifier 23 is equal to or greater than a predetermined reference value, the control unit 10 determines that a fire has occurred and operates the alarm sound control circuit 40 and the indicator lamp circuit 50. Output a signal. Then, the alarm sound control circuit 40 sounds an alarm sound, and the indicator light circuit 50 causes the red LED 52 to display a fire.

  In the control unit 10, the analog electric signal amplified by the light receiving amplifier 23 is converted into a detection level by the A / D converter 15 and input to the calculation unit 11. The calculation unit 11 to which this detection level is input stores this detection level in the RAM 13 as fire detection data. Then, the calculation unit 11 determines whether or not a fire has occurred depending on whether or not the fire detection data stored in the RAM 13 is equal to or greater than a predetermined reference value set in advance. Therefore, the calculation unit 11 and the RAM 13 have a function as a state determination unit.

  When the calculation unit 11 determines that no fire has occurred, the operation unit 11 returns to the operation mode of the sleep mode. On the other hand, when the calculation unit 11 determines that a fire has occurred, the calculation unit 11 causes the alarm sound control circuit 40 to sound an alarm sound and causes the indicator lamp circuit 50 to display a fire on the red LED 52.

Here, the operation of the alarm sound control circuit 40 when a control signal is transmitted from the control unit 10 will be described.
The control unit 10 transmits audio data to be output to the audio D / A converter 41. The audio data transmitted from the control unit 10 is converted into an audio signal by the audio D / A converter 41, and the audio signal is input to the audio amplifier 42. Next, the control unit 10 transmits a volume control signal for adjusting the output volume of the audio signal to the audio amplifier 42, and causes the audio amplifier 42 to adjust the amplification degree of the audio signal. Then, the audio signal whose amplification degree is adjusted is output as an alarm sound in the speaker 43.

Next, the battery exhaustion alarm operation of the alarm device according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 3 (a) shows a time chart of a conventional battery alarm of the alarm device, and FIG. 3 (b) shows a time chart of the battery alarm of the alarm device according to the first embodiment. The alarm sound output and the red LED output at the time of battery exhaustion alarm are shown as pulse signals, respectively.

As shown in FIG. 3 (a), in the conventional battery alarm of the alarm device, the red LED 52 is lit once almost at the same time as the sound of the battery alarm alarm “pi”. Then, after one minute has passed since the first alarm sound, the battery exhaustion alarm sound “pi” and the red LED 52 were lit almost once at the same time.

As shown in FIG. 3 (b), in the alarm device battery exhaustion alarm according to the first embodiment, the red LED 52 is lit once almost at the same time as the sound of the battery exhaustion alarm “pipo”. Thereafter, only the red LED 52 is repeatedly turned on and off at intervals of 1 second. The alarm sound has a two-tone configuration called “pipo”, and the volume of the battery exhaustion alarm is set smaller than the volume of the fire alarm. For example, if the fire alarm volume is set to level 5, the battery exhaustion alarm volume is set to levels 3-4. The alarm sounding time and the red LED 52 lighting time are, for example, about 250 ms.

  The red LED 52 is blinked a predetermined number of times (for example, five times) until one minute has passed since the first alarm sound was sounded. After 1 minute from the first alarm sound, the battery warning alarm sound “Pipo” and the red LED 52 blink almost simultaneously, and then only the red LED 52 blinks once every second. Let it repeat.

In FIG. 3B, the ringing cycle of the alarm sound is 1 minute and the blinking cycle of the red LED 52 is 1 second, but the present invention is not limited to these values. Further, the blinking cycle of the red LED 52 associated with the second and subsequent alarm sounds may be changed with the elapsed time. In the above description, lighting of the red LED 52 is expressed by the elapsed time (for example, 1 second), but it can also be expressed by the number of times of driving the alarm sound and the number of times of driving the red LED 52. That is, in the first embodiment, in any case, the number of times of driving the red LED 52 is set to be larger than the number of times of driving the alarm sound.

Next, the battery exhaustion warning process will be described.
FIG. 4 is a flowchart of an example of a battery exhaustion alarm process of the alarm device according to the first embodiment (FIG. 3B is a time chart showing the operation). 4 is performed every basic period (for example, 1 second) timed by the timer unit 14.

(A1) First, the control unit 10 transmits a monitoring start signal to the battery voltage monitoring circuit 60. The monitoring start signal is transmitted every basic period (for example, 1 second). When the battery voltage monitoring circuit 60 receives the monitoring start signal, the battery voltage monitoring circuit 60 detects the voltage applied to the control unit 10 and transmits a battery voltage detection signal corresponding to the detected voltage to the control unit 10. And if the control part 10 receives a battery voltage detection signal, it will be judged whether it is out of battery based on it (step S11). When the control unit 10 determines that the battery voltage is not determined to be out of battery (step S11: No), the operation flow of the battery out alarm process is terminated.

(A2) When the control unit 10 determines that the battery voltage is confirmed to be out of battery (step S11: Yes), the control unit 10 next determines whether it is the alarm timing of the battery out alarm (step S12). Here, the alarm timing is, for example, after 0 to 4 seconds from the time when the battery voltage is first determined to be out of battery, or after 1 minute (or an integer multiple of 1 minute) from the time when the first determination is determined. 0 to 4 seconds after the time. For example, the counter 19 counts from 0 to 60 every second, and when the counter value becomes 0 to 4, the alarm timing is set. When the control unit 10 determines that it is not the alarm timing (step S12: No), the operation flow of the battery exhaustion alarm process is terminated.

  If the control unit 10 determines that it is an alarm timing (step S12: Yes), it is then determined whether it is the first alarm timing (step S13). Note that the first alarm timing indicates a periodic timing (for example, 1 minute). When the count value of the counter 19 reaches 60, the alarm timing is cleared.

(A3) If the control unit 10 determines that it is the first alarm timing (step S13: Yes), for example, the alarm sound “pipo” is sounded for 250 ms and the red LED 52 is turned on (step S14). ), The battery low alarm processing flow is terminated. The alarm sound “pipo” is generated from the speaker 43 by the control unit 10 controlling the audio D / A converter 41 and the audio amplifier 42. The red LED 52 is turned on when the control unit 10 drives the confirmation lamp drive circuit 51. The same applies to the case described later.

(A4) When determining that it is not the first alarm timing (step S13: No), the control unit 10 determines whether it is the second to fifth alarm timing (step S15). Here, the second to fifth alarm timings are timings when the counter 19 counts the basic period (for example, every second) from the first alarm timing and the counter value becomes 1 to 4.

(A5) If the control unit 10 determines that it is the second to fifth alarm timing (step S15: Yes), then, for example, only the red LED 52 is lit for 250 ms (the alarm sound “pipo” is not sounded). ) (Step S16), the battery low alarm processing flow is terminated.

(A6) When the control unit 10 determines that it is not the second to fifth alarm timing (step S15: No), the battery exhaustion alarm process flow is terminated. When the counter value of the counter 19 exceeds 4, the battery exhaustion alarm process flow may be terminated without performing the alarm timing determination process.

  By the way, in the example of FIG. 4, the example in which the alarm is output based on the number of times of the battery exhaustion alarm has been described, but as shown in FIG. 5 described later, the alarm is output based on the operating time of the battery exhaustion alarm. You may do it.

  FIG. 5 is a flowchart showing another example of the battery exhaustion alarm process of the alarm device according to the first embodiment. FIG. 6 is a time chart showing the operation, and here, an example in which the blinking cycle of the red LED 52 is 10 seconds is described. Note that the alarm processing in FIG. 5 is also performed every basic period (for example, 1 second) counted by the timer unit 14.

(B1) The control unit 10 starts a battery exhaustion alarm process in the same manner as in FIG. 4, and the control unit 10 determines whether or not the battery is exhausted based on the battery voltage detection signal (step S21). On the other hand, when the control unit 10 determines that the battery voltage is not determined to be out of battery (step S21: No), the operation flow of the battery out alarm process is terminated.

  When the control unit 10 determines that the battery voltage is confirmed to be out of battery (step S21: Yes), the control unit 10 then determines whether or not the timing is one minute (step S22). Here, this 1-minute timing is the time when the determination of the battery voltage depletion is first performed or the time when, for example, 1 minute (or an integer multiple of 1 minute) has elapsed from the time of the determination. When the counter value of the counter 19 that counts (for example, every second) reaches 60, the counter value is cleared to 1 minute timing.

(B2) When the control unit 10 determines that the timing is one minute (step S22; Yes),
Next, for example, the alarm sound “pipo” is sounded for 250 ms and the red LED 52 is turned on (step S23), and the battery exhaustion alarm processing flow is ended.

(B3) If the control unit 10 determines that it is not the 1-minute timing (step S22: No), it next determines whether it is the 10-second timing (step S24). The 10-second timing is an elapsed time in units of 10 seconds after the 1-minute timing. For example, when the count value of the counter 19 that counts every second is 10, 20, 30, 40, and 50, respectively. Applicable.

(B4) If the control unit 10 determines that the timing is 10 seconds (step S24: Yes), then only the red LED 52 is lit for 250 ms (does not sound the alarm sound “pipo”) (step S25). The battery low alarm process flow is terminated. In addition, when it is not the 10 second timing (step S24: No), the battery exhaustion alarm processing flow is ended.

  In the example of FIG. 5, the ringing period of the alarm sound is 1 minute and the lighting period of the red LED 52 is 10 seconds. However, the present invention is not limited to these values. Moreover, although the case where this invention was applied to the fire alarm device driven with a battery was demonstrated to the example in the said description, the supply method of a power supply is not limited to this. Furthermore, in the above description, the fire alarm device has been described as an example. However, the present invention can also be applied to an alarm device that detects abnormalities in other monitoring areas such as gas leakage.

  As described above, in the first embodiment, the alarm for the alarm device 100 running out of battery, for example, the alarm sound and the lighting of the red LED 52 are output almost simultaneously, and then the red LED 52 only flashes for a predetermined time. Alternatively, since the output form of being continued a predetermined number of times is repeated at a predetermined timing, it is easy to grasp that the alarm device has output an abnormal alarm. In addition, the alarm sound “Pipo” at the first timing can be distinguished from the sound generated from home appliances in the room, and the shortest time that can be heard with certainty makes it easy to grasp that the alarm device has output an abnormal alarm. It has become. Furthermore, power saving at the time of abnormality alarm can be realized.

  By the way, in said Embodiment 1, although the example of red LED52 was demonstrated as an indicator lamp, as long as the same function was provided, you may employ | adopt another structure. As for the alarm sound “pipo”, another sound may be adopted as long as it can be distinguished from the sound generated by home appliances (electronic sound).

  1 battery, 2 constant voltage circuit, 3 inspection switch, 4 EEP-ROM, 10 control unit, 11 calculation unit, 12 ROM, 13 RAM, 14 timer unit, 15 A / D converter, 16 main clock oscillation unit, 17 sub Clock oscillation unit, 18 interface unit, 19 counter, 20 smoke detection unit, 21 infrared LED drive circuit, 22 photodiode current-voltage conversion circuit, 23 light receiving amplifier, 24 infrared LED, 30 heat detection unit, 31 fixed resistor, 32 Thermistor, 40 Alarm sound control circuit, 41 Audio D / A converter, 42 Audio amplifier, 43 Speaker, 50 Indicator light circuit, 51 Confirmation light drive circuit, 52 Red LED, 60 Battery voltage monitoring circuit, 100 Fire alarm.

Claims (1)

A power supply,
A state detector;
A voltage monitoring unit for monitoring a supply voltage from the power supply unit;
A state determination unit that determines a state based on an output signal of the state detection unit;
A control unit that outputs an alarm based on a determination result of the state determination unit;
In an alarm device comprising a sound producing part and an indicator lamp driven by a control signal of the control unit,
When the state determination unit determines that there is an abnormality or when the voltage monitoring unit determines that the voltage has dropped, the control unit starts driving the sound producing component and the indicator lamp, and determines the number of times the indicator lamp is driven. The alarm device characterized in that the number of times the sound producing component is driven is increased.