JP2011003164A - Fire alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire alarm capable of alarming by sending an infrared ray remote control signal from a fire alarm body to operate other equipment in a cooperative manner when smoke concentration is detected beyond a reference value.SOLUTION: The fire alarm includes: a light-emitting element 12 for emitting infrared light; a light-receiving element 13 for receiving the infrared light emitted from the light-emitting element 12; a detecting means for detecting change in amount of received light of the light-receiving element 13, the change being caused by existence of smoke particles; and a remote control signal outputting means for switching normal output to an infrared light remote control signal and outputting the signal to the light-emitting element 12 when the change in the amount of received light by the detecting means is detected beyond the predetermined reference value.

Description

  The present invention relates to a fire alarm that is installed in a house or the like and detects a smoke generated by a fire and issues an alarm.

  Conventionally, in this type of fire alarm, a light emitting part and a light receiving part are arranged so as to intersect each other in the smoke detection chamber, and light is emitted from the light emitting part into the smoke detection room, and smoke particles that have entered the smoke detection room The light of the light emitting part scattered by the light is detected by the light receiving part, and an alarm is issued based on the detection result (see, for example, Patent Document 1). For this transfer, a buzzer or door phone is connected to the fire alarm device, and other devices such as the buzzer or door phone are operated in conjunction with the detection of the fire alarm device. For example, Patent Document 2 discloses that a fire alarm is connected to an interphone via a two-wire signal line.

JP 2002-352346 A JP 2007-318566 A

  However, in these conventional devices, in order to operate other devices in conjunction with the detection of the fire alarm device, the wiring and special installation work are necessary and complicated. Despite this, its dissemination was hindered.

  The present invention has been made in view of the above problems, and when smoke concentration is detected exceeding a reference value, an infrared remote control signal is transmitted from the fire alarm body, thereby linking other devices. An object is to provide a fire alarm that can be operated and transferred.

  The fire alarm device according to claim 1 includes: a light emitting element that emits infrared light; a light receiving element that receives infrared light emitted from the light emitting element; and an amount of light received by the light receiving element due to the presence of smoke particles. Detecting means for detecting a change in light intensity; remote control signal output means for switching the light emitting element from a normal output to an infrared remote control signal when a change in the amount of light received by the detecting means is detected exceeding a predetermined reference value; And characterized by comprising: and.

  In the present invention and the following invention, the technical meaning and interpretation of terms are as follows. As the light-emitting element, for example, an infrared light-emitting diode can be used, and as the light-receiving element, a photodiode, a phototransistor, or the like can be used, but is not particularly limited due to the nature of the invention.

  When detecting a change in the amount of received light, a change due to an increase or decrease in the amount of received light may be detected according to an increase in the smoke concentration, but the detection method is not particularly limited. For the infrared remote control signal, for example, a specific coded signal in the form of a pulse having a frequency of 38 kHz can be applied.

  A fire alarm device according to claim 2, comprising: a light emitting element; a light receiving element that receives light emitted from the light emitting element; and a detecting unit that detects a change in the amount of light received by the light receiving element due to the presence of smoke particles. A remote control signal output means for outputting an infrared remote control signal when a change in the amount of light received by the detection means exceeds a predetermined reference value; and an infrared remote control signal is transmitted in response to an output from the remote control signal output means; And an infrared light emitting element.

  The number of infrared light emitting elements is not particularly limited. It is also possible to select appropriately according to the installation environment. For example, infrared light emitting diodes of the same type can be used for the light emitting elements and the infrared light emitting elements that transmit infrared remote control signals. Thereby, when providing an infrared light emitting element, it becomes possible to cope with a relatively simple design.

  According to the first aspect of the present invention, when the smoke concentration exceeds the reference value, an infrared remote control signal is transmitted from the fire alarm, thereby causing other devices to operate in cooperation with each other. Since the transfer can be performed, wiring for the transfer and special installation work can be omitted, and the configuration can be prevented from becoming complicated. Further, since the infrared remote control signal is transmitted using the light emitting element used for detecting smoke, the configuration can be simplified.

  According to the second aspect of the present invention, the transmission range of the infrared remote control signal can be set wide, and it is possible to ensure the arrival of the signal to other devices.

It is a perspective view which shows the fire alarm device which concerns on the 1st Embodiment (Example 1) of this invention. It is a top view which shows a smoke detection part. It is a block diagram which shows a circuit structure. It is a flowchart which shows operation | movement. It is explanatory drawing which shows operation | movement. It is a top view which shows the smoke detection part which concerns on the same (Example 2). It is a top view which shows the smoke detection part of the fire alarm which concerns on the 2nd Embodiment of this invention. It is a top view which shows a fire alarm. It is a block diagram which shows a circuit structure. It is explanatory drawing which shows operation | movement.

  Hereinafter, a fire alarm device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1) In FIG. 1, a fire alarm main body 1 has a substantially disk shape and is used by being attached to a ceiling surface or a wall surface in a house. The main body 1 includes a mounting base 2 and a cover 3, and a central portion of the cover 3 projects in a dish shape, and a smoke inlet 4 is formed around the side thereof. In addition, an indicator lamp 5 composed of a red light emitting diode is provided at the lower center portion of the cover 3. This indicator lamp 5 blinks at the time of alarm. The smoke inlet 4 is provided with a lattice-like insect net 6 to allow smoke to flow and to prevent the passage of insects and the like.

  Furthermore, an acoustic hole 7 is formed in the cover 3. Inside the cover 3 corresponding to the acoustic hole 7, a speaker is housed as a notification means for issuing an alarm. A stop button 8 is provided on the outer peripheral side of the cover 3. The stop button 8 is used to stop an alarm sound, and a switch that is operated by operating the stop button 8 is incorporated in the cover 3. And in the cover 3, the circuit board etc. which mounted the smoke detection part and the microcomputer are accommodated.

  Next, the smoke detection unit 10 will be described with reference to FIG. FIG. 2 is a plan view on the lower side when the fire alarm main body 1 is attached to the ceiling surface. An infrared light emitting diode 12 as a light emitting element and a photodiode 13 as a light receiving element are attached to a circular base plate 11 in the vicinity of the outer periphery with an interval of about 90 degrees. A portion where the irradiation range of the infrared light emitting diode 12 and the light receiving range of the photodiode 13 overlap is configured as a detection region A.

  A labyrinth wall 15 including a plurality of partition walls 14 is integrally formed on the outer peripheral side of the base plate 11. Each of the partition walls 14 is formed to have a plurality of wall surfaces with a cross-sectional shape bent in a substantially L shape or Z shape, and these partition walls 14 are arranged so as to surround the detection area A. Yes. The labyrinth wall 15 is formed of a black resin having a high light absorption rate together with the base plate 11 so as not to cause reflection.

  The labyrinth wall 15 allows the intrusion of smoke from the smoke inlet 4 and prevents the incidence of disturbance light such as sunlight or illumination light, thereby enabling detection of smoke. It functions to prevent malfunctions due to the influence of light. Note that a light projecting lens and a light receiving lens can be provided on the front side of the infrared light emitting diode 12 and the photodiode 13, respectively, as necessary.

  According to such a configuration, the light emitted by the light emission of the infrared light emitting diode 12 is applied to the detection region A. When smoke enters the detection region A, the irradiated infrared light is converted into smoke. Scattered by the particles, the scattered light enters the photodiode 13. When the smoke concentration increases, the smoke particles increase and the amount of light received by the photodiode 13 also increases. When the degree of change exceeds a set threshold, this is detected and the alarm sound or the indicator lamp 5 A warning is given by flashing.

  Next, the circuit configuration of the fire alarm will be described with reference to the block diagram of FIG. In the present embodiment, a microcomputer (hereinafter referred to as “microcomputer”) 20 executes the overall control. The microcomputer 20 generally includes a CPU 21 having a calculation unit and a control unit, a ROM 22 and a RAM 23 that are storage units, and an input / output control unit 24. The input / output control means 24 is connected to the infrared light emitting diode 12 constituting the smoke detector 10 and the photodiode 13 to which the amplifier 25 is connected. In addition, a speaker 27 is connected via an amplifier 26, and an indicator lamp 5 and an alarm sound stop switch 28 are connected. A lithium battery 29 is used as a power source.

  The operation of the fire alarm configured as described above will be described mainly with reference to the flowchart of FIG. This operation is basically controlled by a program of the microcomputer 20. First, light is emitted by the light emission of the infrared light emitting diode 12 (S1). The photodiode 13 receives light in the detection area A (S2). Then, the received light amount of the photodiode 13 is compared with the reference value of the received light amount stored in advance in the ROM 22 or RAM 23 of the microcomputer 20 (S3). This reference value is a threshold and is a level at which it is possible to determine that a fire has occurred due to an increase in the smoke concentration in the detection area A. If the amount of light received by the photodiode 13 has not reached the reference value, the process returns to step 1 (S1), and this routine is repeatedly executed at all times (S4). That is, the detection means detects whether or not the change in the amount of light received by the photodiode 13 exceeds a threshold value.

  Subsequently, when smoke enters the detection area A, infrared light from the infrared light emitting diode 12 is scattered by smoke particles, and the scattered light enters the photodiode 13, and the amount of light received by the photodiode 13. And smoke is detected. Then, as the smoke concentration increases, the amount of received light continuously increases, and when the detection means determines that the increase exceeds the threshold value (S4), the CPU 21 determines that a fire has occurred, A control signal for issuing an alarm is transmitted to the speaker 27 and the indicator lamp 5. In response to this control signal, the speaker 27 emits an audio message “warning view is a fire.” Which is stored in the ROM 22 as alarm data. The light emitting diode blinks to notify the fire (S5).

  Along with this alarm operation, the CPU 21 switches the output to the infrared light emitting diode 12 from the normal output to the infrared remote control signal by the remote control signal output means and outputs it. That is, a specific coded remote control signal in the form of a pulse having a frequency of 38 kHz, for example, stored in the ROM 22 is output to the infrared light emitting diode 12 via the input / output control means 24 (S6). The infrared light emitting diode 12 receives this remote control signal and transmits an infrared remote control signal of 38 kHz (S7).

  And this infrared remote control signal is sent out so that it may leak from the clearance gap etc. of the labyrinth wall 15 of the smoke detection part 10. FIG. Then, as shown in FIG. 5, this signal reaches and is received by the remote control receiver of the luminaire L installed in the vicinity of the ceiling surface to which the fire alarm body 1 is attached. The lighting fixture L receives this signal and is controlled to be turned on or blinked. That is, in this state, the fire alarm main body 1 functions as a remote control transmitter, and the lighting fixture L is a device that is controlled by receiving the signal.

  Since the surroundings are brightly illuminated by lighting or flashing of the lighting fixture L, it is effective particularly in an emergency situation at the time of a fire at night. In addition, lighting or blinking also serves as an alarm. In addition, the apparatus which receives an infrared remote control signal is not restricted to the lighting fixture L, If it is an apparatus which can receive the signal, it is applicable.

  As described above, according to the present embodiment, when the smoke concentration is detected exceeding the reference value, an infrared remote control signal is transmitted from the fire alarm main body 1, whereby other devices, for example, The information can be transferred by operating the lighting fixture L or the like in cooperation. In this case, since the infrared remote control signal is transmitted using the infrared light emitting diode 12 used for detecting smoke, the configuration can be simplified. In addition, wiring for transferring information and special installation work are not required, and the complexity of the configuration can be avoided.

  (Embodiment 2) The smoke detector 10 of this embodiment will be described with reference to FIG. In the present embodiment, the light guides 16 are provided on both sides of the infrared light emitting diode 12 in the vicinity of the light emitting part. When an infrared remote control signal is transmitted from the infrared light emitting diode 12, the labyrinth wall 15 or the like may be an obstacle, and the signal may not reach the target device.

  Therefore, in this embodiment, a light guide unit 16 is provided so that a remote control signal can be efficiently transmitted to the outside. Therefore, the remote control signal can reach the target device and can be reliably operated.

  Next, a fire alarm device according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent, and the overlapping description is abbreviate | omitted. In the present embodiment, an infrared light emitting diode 12a that transmits an infrared remote control signal is provided separately from the infrared light emitting diode 12 used for detecting smoke. The infrared light emitting diodes 12 and 12a are of the same type. Therefore, when the infrared light emitting diode 12a is added, it is possible to cope with a relatively simple design such as additionally setting the port of the microcomputer 20.

  The smoke detection unit 10 will be described with reference to FIG. Similar to the first embodiment, an infrared light emitting diode 12 as a light emitting element and a photodiode 13 as a light receiving element are attached to the base plate 11 with an interval of about 90 degrees. Then, three infrared light emitting diodes 12a are attached to the outer peripheral side of the base plate 11 with an equal interval of about 120 degrees so that the emission part is exposed to the outside.

  Therefore, as shown in FIG. 8, the three infrared light emitting diodes 12 a are arranged to protrude outward from the smoke inlet 4. Further, as shown in the block diagram of FIG. 9, the three infrared light emitting diodes 12 a are connected to the input / output control means 24. Note that the number of the infrared light emitting diodes 12a is not limited to three. Three or more, or one may be sufficient.

  According to such a configuration, when the smoke concentration increases, the amount of received light continuously increases, and the detection means determines that the increase exceeds the threshold, the CPU 21 determines that a fire has occurred. Then, the remote control signal output means outputs an infrared remote control signal to the infrared light emitting diode 12 a via the input / output control means 24. The three infrared light emitting diodes 12a receive this remote control signal and transmit a specific coded infrared remote control signal of 38 kHz radially. Then, as shown in FIG. 10, this signal reaches a remote control receiver in an information device such as a TV door phone P installed indoors and is received. The TV door phone P receives this signal, emits an alarm sound, and displays a pictogram or the like notifying a fire on the display screen.

  As described above, according to the present embodiment, in addition to the same effects as those of the first embodiment, the infrared light emitting diode 12a for transmitting the infrared remote control signal is separately provided, so that the transmission range of the remote control signal is widened. Therefore, it is possible to ensure the arrival of signals to other devices such as the TV door phone P.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, this type of fire alarm includes a battery using a battery and a commercial power supply as a power source, but the present invention is applicable to both.

1 ... fire alarm body, 10 ... smoke detector,
12 ... Light emitting element (infrared light emitting diode), 12a ... Infrared light emitting element,
13 ... light receiving element (photodiode), 15 ... labyrinth wall,
16 ... light guide, 20 ... microcomputer

Claims (2)

A light emitting device that emits infrared light;
A light receiving element for receiving infrared light emitted from the light emitting element;
Detecting means for detecting a change in the amount of light received by the light receiving element due to the presence of smoke particles;
Remote control signal output means for switching the light emitting element from a normal output to an infrared remote control signal when a change in the amount of light received by the detection means is detected exceeding a predetermined reference value;
A fire alarm device comprising: A light emitting element;
A light receiving element for receiving light emitted from the light emitting element;
Detecting means for detecting a change in the amount of light received by the light receiving element due to the presence of smoke particles;
Remote control signal output means for outputting an infrared remote control signal when a change in the amount of light received by the detection means exceeds a predetermined reference value;
An infrared light emitting element for receiving an output from the remote control signal output means and transmitting an infrared remote control signal;
A fire alarm device comprising:

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