JP2022183856A - Detection device - Google Patents

Abstract

To accurately detect smoke and/or a fire with a simple configuration.SOLUTION: A detection device includes: a light source for radiating white light; a housing section which has a wall part for forming an internal space to which outer air is introduced and which is colored by a color containing a first luminous color at a position to which the white light is radiated in the wall part; a first light detection section for detecting the light intensity of the first luminous color; a second light detection section for detecting the light intensity of a second luminous color; a third light detection section for detecting the light intensity of a third luminous color; a storage section for storing a first reference intensity of the first light detection section, a second reference intensity of the second light detection section, and a third reference intensity of the third light detection section; and a determination section for determining whether smoke is contained in the outer air introduced to the housing section.SELECTED DRAWING: Figure 1

Description

The present invention relates to detection devices for detecting smoke and/or fire.

There are known smoke detectors, fire alarms, and the like that detect smoke in the outside air by irradiating light into a space into which the outside air flows and detecting scattered light scattered by smoke particles (for example, patent documents 1). There is also known a technique for determining whether or not there is a fire by detecting smoke generated within a monitoring area from images captured by a monitoring camera (see Patent Document 2, for example).

Japanese Unexamined Patent Application Publication No. 2016-20902 JP 2004-104727 A

Smoke detectors, fire alarms, and the like can reduce the risk of fire damage by installing them in houses and the like. Such smoke detectors, fire alarms, etc. are desired to be able to detect smoke or fire accurately with a simple configuration without using complicated structures, complicated calculations, or additional equipment such as surveillance cameras. rice field.

Accordingly, the present invention has been made in view of these points, and an object of the present invention is to enable accurate detection of smoke and/or fire with a simple configuration.

In the first aspect of the present invention, a light source unit emitting white light including light of a first emission color, a second emission color, and a third emission color, which are different from each other, and an internal space into which outside air is introduced are formed. a housing portion having a wall portion that is illuminated with the white light, and a position of the wall portion that is irradiated with the white light is colored with a color including the first emission color; a first light detection unit arranged at a position where light is not directly irradiated and detects the intensity of the incident light of the first emission color; and a position inside the housing unit where the light of the light source unit is not directly irradiated. a second light detection unit that detects the intensity of the incident light of the second emission color; a third photodetector that detects the intensity of the incident light of the third emission color; The intensity of light detected by the first photodetector is stored as a first reference intensity, the intensity of light detected by the second photodetector is stored as a second reference intensity, and detected by the third photodetector. a storage unit for storing the intensity of the detected light as a third reference intensity; a difference between the intensity of the light detected by the first photodetector and the first reference intensity; and the intensity of the light detected by the second photodetector. The outside air introduced into the storage unit contains smoke based on the difference between the intensity and the second reference intensity and the difference between the intensity of the light detected by the third light detection unit and the third reference intensity. and a determination unit that determines whether or not a detection device is provided.

Each of the first luminescent color, the second luminescent color, and the third luminescent color may be one of red, green, and blue.

The determination unit comprises a difference between the intensity of light detected by the first photodetector and the first reference intensity, a difference between the intensity of light detected by the second photodetector and the second reference intensity, and the Whether smoke is contained in the outside air introduced into the storage unit in response to a change in at least one of the difference between the light intensity detected by the third light detection unit and the third reference intensity It may be determined whether

The determination unit determines whether the intensity of the light detected by the first photodetector is lower than the first reference intensity and the intensity of the light detected by the second photodetector is higher than the second reference intensity. It may be determined that dust is attached to the wall portion of the housing portion in response to the intensity of the light detected by the third light detection portion increasing above the third reference intensity.

The determination unit determines whether the intensity of light detected by the first light detection unit is less than the first reference intensity and the intensity of light detected by the second light detection unit is less than the second reference intensity. , the light source unit, the first light detection unit, the second light detection unit, or the third It may be determined that dust adheres to the photodetector.

In the storage unit, the first light detection unit, the second light detection unit, and the third light detection unit detect when smoke generated by burning an object for each type is introduced into the space. and further storing a table associating the intensity of the detected light with the type of the object as a reference table, wherein the detection device includes the first photodetector, the second photodetector, and the third photodetector. may further include an identification unit that identifies whether or not the smoke contained in the outside air is smoke from combustibles by comparing the intensity of the light detected by each with the reference table.

When the specifying unit specifies that the smoke contained in the outside air is smoke caused by combustion, the first light detecting unit, the second light detecting unit, and the third light detecting unit detect The type of burning object may be further determined by comparing the light intensity to the reference table.

The detection device includes a fire determination unit that determines whether or not a fire has occurred based on the identification result of the identification unit, and an alarm to the outside in response to the fire determination unit determining that a fire has occurred. and an alarm unit that generates the

A position irradiated with the white light on the wall portion of the housing portion is colored with a predetermined coloring pattern, and the coloring pattern is the first reference intensity, the second reference intensity, or the third reference intensity. may be formed so that the strength of at least one of is a predetermined magnitude.

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that smoke and/or a fire can be detected with a simple structure with sufficient accuracy.

1 shows a configuration example of a detection device 10 according to the present embodiment. An example of a block diagram of a circuit provided on a circuit board 30 according to the present embodiment is shown. FIG. 3 shows a cross-sectional view of the circuit board 30 and the accommodating portion 60 in the present embodiment, and a first example of the detection result of the photodetector 50. FIG. FIG. 4 shows a cross-sectional view of the circuit board 30 and the accommodating portion 60 in the present embodiment, and a second example of the detection result of the photodetector 50. FIG. 3A and 3B show a cross-sectional view of the circuit board 30 and the accommodating portion 60 in the present embodiment, and a third example of the detection result of the photodetector 50. FIG. 4A and 4B show a cross-sectional view of the circuit board 30 and the accommodating portion 60 in the present embodiment, and a fourth example of the detection result of the photodetector 50. FIG.

<Configuration example of detection device 10>
FIG. 1 shows a configuration example of a detection device 10 according to this embodiment. FIG. 1A shows an example of a cross-sectional view of the detection device 10 along a plane substantially parallel to the XZ plane. Further, FIG. 1B shows an example of a cross-sectional view of the inside of the detection device 10 along a plane substantially parallel to the XY plane passing through line AA of FIG. 1A. In this embodiment, three orthogonal axes are shown as the X-axis, Y-axis, and Z-axis. The detection device 10 has a function of detecting smoke in the outside air and/or a function of determining whether or not a fire has occurred. The detection device 10 includes a main body 20 , a circuit board 30 , a light source section 40 , a photodetector 50 , a housing section 60 and a light shielding plate 70 .

The main body 20 is a housing made of resin, metal, or the like. The body 20 has a base portion 22 and a cover portion 24 . The base portion 22 includes an installation surface that can be installed on a ceiling surface 23 or a wall of a house. Internal parts of the detection device 10 are provided on the surface opposite to the installation surface of the base portion 22 . A cover portion 24 is attached to the surface of the base portion 22 opposite to the installation surface. In other words, the main body 20 is configured by attaching the cover portion 24 to the base portion 22 .

The cover portion 24 protects internal components of the detection device 10 . In addition, the cover portion 24 is provided with a plurality of holes (not shown) for allowing outside air to pass through. In other words, the hole functions as an inlet for outside air to enter the interior of the main body 20 and also as an outlet for the outside air to exit the main body 20 . For example, when the detection device 10 is attached to the ceiling surface 23 in the room and smoke is generated due to a fire in the room or the like, the smoke enters the inside of the main body 20 through the hole. Then, the detection device 10 detects smoke that has entered the interior of the main body 20 . The detection of smoke by the detection device 10 will be described later.

Preferably, the holes are formed at a plurality of positions on the body 20 . Moreover, at least some of the plurality of holes may function as an output port for transmitting an alarm sound or the like generated inside the main body 20 to the outside. A warning sound and the like will be described later.

The circuit board 30 is a board on which circuits, circuit elements, power supply circuits, and the like are provided. The circuit board 30 is mounted with, for example, the light source unit 40 , the photodetector 50 , a driving circuit for operating the light source unit 40 and the photodetector 50 , and the like. Further, the circuit board 30 is provided with a control section and the like that controls each section of the detection device 10 to perform a detection operation. A housing portion 60 is further provided on the circuit board 30 . Such a circuit board 30 is fixed to the base portion 22, for example.

The light source unit 40 emits white light including light of a first emission color, a second emission color, and a third emission color, which are different from each other. For example, each of the first emission color, the second emission color, and the third emission color is one of red, green, and blue. In this case, the light source unit 40 is a white LED with red, green and blue LEDs. Also, the light source unit 40 may be a white laser diode including a red laser diode, a green laser diode, and a blue laser diode. Alternatively or additionally, the light source section 40 may include an EL element.

The photodetector 50 detects the intensity of the first emission color, the second emission color, and the third emission color in the white light emitted from the light source unit 40 . Photodetector 50 detects, for example, the intensity of red, green, and blue light. In this case, photodetector 50 may be a color sensor that outputs RGB values corresponding to the intensity of the input red, green, and blue light.

Examples of color sensors include a red sensor made up of a filter and a light receiving element that allow red light to pass through, a green sensor made up of a filter and light receiving element that allows green light to pass through, and a blue sensor made up of a filter and light receiving element that allows blue light to pass through. and The color sensor has, for example, one red sensor, one green sensor, and one blue sensor, and is configured in one band such that the three sensors are arranged in a line. Alternatively, the color sensor may have multiple red sensors, green sensors, and blue sensors, and the three types of sensors may be arranged in a predetermined pattern.

In this embodiment, any one of the red sensor, green sensor, and blue sensor is called a first photodetector. In addition, one of the two sensors obtained by removing the first light detection section from the red sensor, green sensor, and blue sensor is called the second light detection section, and the other sensor is called the third light detection section. In other words, the first photodetector detects the intensity of the light of the first emission color, the second photodetector detects the intensity of the light of the second emission color, and the third photodetector detects the intensity of the light of the third emission color. Detect the intensity of the emitted color light. The photodetector 50 has such a first photodetector, a second photodetector, and a third photodetector.

The housing portion 60 houses optical components such as the light source portion 40 and the photodetector 50 . The housing portion 60 has a plurality of walls so that external light reaches the photodetector 50 and reduces noise components detected by the photodetector 50 . For example, by being attached to the circuit board 30, the housing section 60 functions as a dark box against extraneous light including visible light. The housing portion 60 is made of, for example, metal or resin.

The housing portion 60 has a plurality of walls such as a first wall portion 61 and a second wall portion 62 . The plurality of wall portions form a space inside the housing portion 60 into which outside air is introduced. FIG. 1 shows an example in which a light source section 40 and a photodetector 50 are provided in such a space. In addition, the housing portion 60 has a path for allowing outside air to pass therethrough. The plurality of first wall portions 61 form a path through which outside air passes through the interior of the housing portion 60 while shielding light from the outside. A structure formed by such a plurality of first wall portions 61 is known as a labyrinth structure, and detailed description thereof is omitted here.

It is desirable that the entire housing portion 60 is colored with black or the like. In addition, the plurality of walls forming the internal space are colored with a color including the first emission color at positions where the white light from the light source unit 40 is irradiated. FIG. 1 shows an example in which the second wall portion 62 is irradiated with white light. The second wall portion 62 faces the circuit board 30 and functions as a top plate of the housing portion 60 . In the present embodiment, an example will be described in which the first emission color is red and the position of the second wall portion 62 irradiated with white light is colored red.

The housing portion 60 may be further surrounded by an insect screen or the like. The insect screen is, for example, a wire mesh, a metal having a plurality of through holes, or a resin molding. The insect screen prevents insects and the like from entering the housing portion 60 while allowing outside air to pass through.

The light shielding plate 70 is provided in the internal space of the housing portion 60 . The light shielding plate 70 is provided between the light source section 40 and the photodetector 50 so as to prevent the white light emitted from the light source section 40 from directly entering the photodetector 50 . The light blocking plate 70 is made of metal or resin, for example, to block white light. The light shielding plate 70 is preferably colored, for example, black so that the light reflectance is low. By providing such a light shielding plate 70, the first light detection section, the second light detection section, and the third light detection section are not directly irradiated with light from the light source section 40 inside the housing section 60. placed in position.

<Example of Block Diagram of Circuit Board 30>
FIG. 2 shows an example of a block diagram of a circuit provided on the circuit board 30 according to this embodiment. A light source unit 40 , a photodetector 50 , a power supply circuit 110 , a storage unit 120 , a control unit 130 and an alarm unit 140 are mounted on the circuit board 30 .

Since the light source unit 40 and the photodetector 50 have been described with reference to FIG. 1, duplicate descriptions will be omitted here. In FIG. 2, the first photodetector 51 is an element that detects the first red emission color, the second photodetector 52 is an element that detects the second green emission color, and the third blue emission color is detected. A third photodetector 53 is an element that detects light.

The power supply circuit 110 supplies power to the circuits, circuit elements, etc. of the detection device 10 . The power supply circuit 110 converts, for example, an externally input DC voltage V0 into a different DC voltage V1 to stabilize it, and supplies the converted DC voltage to circuit elements and the like provided on the circuit board 30 . Also, the power supply circuit 110 may have a primary battery such as a manganese battery or a secondary battery such as a lithium ion battery.

The storage unit 120 stores, as a reference value, the signal level of the detection signal detected by the photodetector 50 when smoke is not introduced into the internal space of the housing unit 60 . The storage unit 120 stores, for example, the amount of light detected by the first light detection unit 51 while the light source unit 40 is emitting white light in a state where outside air containing smoke is not introduced into the internal space of the housing unit 60. The intensity is stored as a first reference intensity, the intensity of light detected by the second photodetector 52 is stored as a second reference intensity, and the intensity of light detected by the third photodetector 53 is stored as a third reference intensity. do.

Since the photodetector 50 is housed inside the housing portion 60, even if the main body 20 of the detection device 10 is irradiated with external light, it hardly receives such external light. In addition, the photodetector 50 is arranged at a position where the light from the light source section 40 is not directly irradiated inside the housing section 60 . As a result, the second light detection unit 52 and the third light detection unit 53 detect the light source even if the light source unit 40 irradiates the inside of the housing unit 60 with white light when smoke does not enter the housing unit 60 . Almost no light from the portion 40 is received.

On the other hand, the second wall portion 62 of the housing portion 60 is colored with the first emission color and is irradiated with the light of the light source portion 40, so that the light of the first emission color out of the light of the light source portion 40 is reflected. do. Therefore, when the light source unit 40 irradiates the inside of the accommodation unit 60 with white light, the first light detection unit 51 is included in the white light even when smoke does not enter the inside of the accommodation unit 60 . Part of the light of the first emission color is received. As a result, the first reference strength becomes stronger than the second reference strength and the third reference strength. The storage unit 120 stores such values of the first reference strength, the second reference strength, and the third reference strength.

In addition, the storage unit 120 stores the first light detection unit 51, the second light detection unit 52, and the third light detection unit 53, respectively, when smoke generated by burning the target object for each type is introduced into the space. A table that associates the intensity of detected light with the type of object may be further stored as a reference table. The object is, for example, a material contained in an object that is expected to burn if a fire breaks out in the room where the detection device 10 is installed. Further, the object includes an object that generates smoke due to combustion or the like even if no fire breaks out in the room where the detection device 10 is installed. The objects are, for example, paper, wood, cotton, resin, electric wires, cigarettes, cigars, cooking ingredients, and the like.

The storage unit 120 may store intermediate data generated (or used) by the detection device 10 in the process of operation, calculation results, thresholds, reference values, parameters, and the like. In addition, the storage unit 120 may supply the stored data to the request source in response to a request from each unit in the detection device 10 .

For example, when a computer functions as the control unit 130, the storage unit 120 may store information such as an OS (Operating System) and programs that make the computer function. Further, the storage unit 120 may store various information including a database that is referred to when executing the program. For example, the computer functions as control unit 130 by executing a program stored in storage unit 120 .

The storage unit 120 includes, for example, a ROM (Read Only Memory) that stores various programs and various tables executed by a computer or the like, and a RAM (Random Access Memory) that serves as a work area. The storage unit 120 may also include a large-capacity storage device such as a HDD (Hard Disk Drive) and/or an SSD (Solid State Drive).

The control unit 130 controls each unit of the detection device 10 to determine whether or not the outside air that has entered the internal space of the housing unit 60 contains smoke. Also, the control unit 130 may determine whether or not a fire is occurring in the vicinity of the detection device 10 . Control unit 130 has determination unit 131 , identification unit 132 , and fire determination unit 133 .

The determination unit 131 determines the difference between the intensity of light detected by the first photodetector 51 and the first reference intensity, the difference between the intensity of light detected by the second photodetector 52 and the second reference intensity, and the 3 Based on the difference between the light intensity detected by the light detection unit 53 and the third reference intensity, it is determined whether or not the outside air introduced into the housing unit 60 contains smoke. Here, the difference between the intensity of light detected by the first photodetector 51 and the first reference intensity is defined as the first intensity difference, and the difference between the intensity of light detected by the second photodetector 52 and the second reference intensity is is the second intensity difference, and the difference between the intensity of light detected by the third photodetector 53 and the third reference intensity is the third intensity difference.

Further, the determination unit 131 determines the ratio between the intensity of light detected by the first photodetector 51 and the first reference intensity, and the ratio of the intensity of light detected by the second photodetector 52 and the second reference intensity. Alternatively, it may be determined whether or not the outside air introduced into the housing section 60 contains smoke based on the ratio between the intensity of the light detected by the third light detection section 53 and the third reference intensity. Here, the difference between the intensity of light detected by the first photodetector 51 and the first reference intensity is defined as a first intensity ratio, and the difference between the intensity of light detected by the second photodetector 52 and the second reference intensity is is defined as a second intensity ratio, and the difference between the intensity of light detected by the third photodetector 53 and the third reference intensity is defined as a third intensity ratio.

When smoke does not enter the housing portion 60, the first intensity difference, the second intensity difference, and the third intensity difference hardly change. Therefore, for example, the determination unit 131 detects smoke in the outside air introduced into the housing unit 60 in response to a change in at least one intensity difference among the first intensity difference, the second intensity difference, and the third intensity difference. Determine whether it contains Alternatively, the determination unit 131 determines whether the outside air introduced into the storage unit 60 is It may be determined whether or not smoke is included. Alternatively, the determination unit 131 may perform the determination operation each time a predetermined period of time elapses.

The identification unit 132 compares the intensity of the light detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 with the reference table to identify smoke contained in the outside air. Identify whether the smoke is caused by burning materials. The identifying unit 132 may further identify the color of the smoke and/or the type of burning object.

For example, when the determination unit 131 determines that the outside air contains smoke, the specifying unit 132 specifies whether the smoke contained in the outside air is smoke from a combustible material. Alternatively, the specifying unit 132 may cause smoke contained in the outside air to burn in response to a change in at least one intensity difference among the first intensity difference, the second intensity difference, and the third intensity difference. You may specify whether it is smoke by an object. Alternatively, the determination unit 131 determines whether the smoke contained in the outside air is combusted in response to a change in at least one intensity ratio among the first intensity ratio, the second intensity ratio, and the third intensity ratio. You may specify whether it is smoke by an object. Alternatively, the identifying unit 132 may perform a specific action each time a predetermined period of time elapses.

The fire determination unit 133 determines whether or not a fire has occurred based on the identification result of the identification unit 132 . For example, when the type of target specified by the specifying unit 132 is the type of target that is expected to burn due to fire, the fire determination unit 133 determines that a fire is occurring. If the type of object specified by the specifying unit 132 is an object that generates smoke due to combustion or the like even if no fire occurs, the fire determination unit 133 determines that no fire has occurred. Fire determination unit 133 supplies a control signal for controlling alarm unit 140 to alarm unit 140 when it is determined that a fire has occurred.

The alarm unit 140 issues an alarm to the outside in response to the fire judgment unit 133 judging that a fire has occurred. Alarm unit 140 includes alarm drive circuit 141 , speaker 142 , and indicator light 143 . The alarm drive circuit 141 drives the speaker 142 and the indicator lamp 143 according to the control signal. Note that when the detection device 10 operates as a smoke detector, the control unit 130 supplies a control signal for controlling the alarm unit 140 to the alarm unit 140 in response to detection of smoke. The alarm drive circuit 141 may drive the speaker 142 and the indicator light 143 so as to issue alarms corresponding to smoke detection and fire detection, respectively.

In addition, although the example in which the alarm unit 140 shown in FIG. 2 includes the speaker 142 has been described, the present invention is not limited to this. The alarm unit 140 may include a buzzer or the like in place of the speaker 142, or alternatively, the speaker 142 may be omitted. In addition, the alarm unit 140 may notify the outside of detection of smoke and detection of fire. In this case, it is desirable that the alarm unit 140 is connected to the outside via a network or the like.

As described above, the detection device 10 according to the present embodiment can detect the difference between the detection result of the photodetector 50 when no smoke is introduced and the detection result of the photodetector 50 when outside air is introduced. Detect smoke and/or fire based on Such a detection operation by the control unit 130 of the detection device 10 will be described below.

<Example of initial state of detection signal>
FIG. 3 shows a cross-sectional view of the circuit board 30 and the housing portion 60 and a first example of the detection result of the photodetector 50 in this embodiment. FIG. 3 shows an example of the initial state of the detection signal of the photodetector 50. As shown in FIG. FIG. 3A shows the container 60 in a state where no smoke is introduced into the internal space. FIG. 3(B) shows the concept of the detection result output by the photodetector 50 in the state of FIG. 3(A). The vertical axis of FIG. 3(B) indicates the signal level of the detection signal output by the photodetector 50 . On the horizontal axis of FIG. 3B, "R" indicating the detection signal of the first photodetector 51, "G" indicating the detection signal of the second photodetector 52, and "G" indicating the detection signal of the third photodetector 53. are attached with "B", respectively.

As already described, since the second wall portion 62 is colored with the first emission color, the light of the first emission color among the light from the light source portion 40 is reflected by the second wall portion 62 . Therefore, the first photodetector 51 detects light of the first emission color to some extent even in the initial state. Thus, the signal level of the detection signal output by the first photodetector 51 is the first reference intensity.

Most of the light of the second emission color and the third emission color among the light of the light source section 40 is absorbed by the second wall section 62, and the remaining part is reflected. Therefore, the signal levels detected by the second photodetector 52 and the third photodetector 53 are lower than the first reference intensity. Thus, the signal level of the detection signal output by the second photodetector 52 is the second reference intensity, and the signal level of the detection signal output by the third photodetector 53 is the third reference intensity. The storage unit 120 stores such values of the first reference strength, the second reference strength, and the third reference strength.

<Example of a state in which smoke enters the accommodation unit 60>
FIG. 4 shows a cross-sectional view of the circuit board 30 and the accommodating portion 60 and a second example of the detection result of the photodetector 50 in this embodiment. FIG. 4A shows a state in which smoke has entered the internal space of the housing portion 60 . FIG. 4(B) shows the concept of the detection result output by the photodetector 50 in the state of FIG. 4(A). In this case, the light from the light source unit 40 is scattered by the smoke particles. The larger the size of the smoke particles and the greater the number of smoke particles, the more the scattered light component of the light from the light source unit 40 increases. When smoke particles become as small as the wavelength of light, light with short wavelengths such as blue and ultraviolet rays tends to be scattered more than light with long wavelengths such as red and infrared rays. Therefore, the signal level of the signal detected by the corresponding photodetector may differ depending on the wavelength of the light of each emission color and the particle size of the smoke particles.

As described above, the light of the first emission color is scattered by the smoke particles, while the light reflected by the second wall portion 62 of the housing portion 60 is reduced due to the shadow of the smoke that has entered the housing portion 60. do. Therefore, the signal level detected by the first photodetector 51 may increase depending on the size of the smoke, the concentration (amount, density) of the smoke, the area of the second wall 62 colored with the first emission color, and the like. may decrease. FIG. 4B shows an example in which the signal level detected by the first photodetector 51 is higher than the first reference intensity in the initial state. Note that the area of the second wall portion 62 to be colored with the first emission color is adjusted in advance so that the signal level detected by the first light detection portion 51 increases from the initial state when smoke enters the housing portion 60. can be designed and adjusted.

The light of the second emission color and the third emission color is scattered by the smoke particles as described above. In addition, since the light of the second emission color and the third emission color is hardly reflected by the second wall portion 62, even if the smoke that has entered the housing portion 60 becomes a shadow, the signal level detected by the light detection portion does not exceed the level of the light. little impact. Therefore, the signal levels detected by the second photodetector 52 and the third photodetector 53 are both higher than the reference intensity in the initial state.

Therefore, the determination unit 131 determines whether the intensity of the light detected by the first photodetector 51 is greater than the first reference intensity and the intensity of the light detected by the second photodetector 52 is greater than the second reference intensity. , when the intensity of the light detected by the third light detection unit 53 has increased above the third reference intensity, it is determined that the outside air introduced into the housing unit 60 contains smoke. Thereby, the detection device 10 can detect that smoke is generated in a room or the like in which the detection device 10 is installed.

<Example of a state in which dust adheres to the second wall portion 62 of the housing portion 60>
FIG. 5 shows a cross-sectional view of the circuit board 30 and the housing portion 60 and a third example of the detection result of the photodetector 50 in this embodiment. FIG. 5A shows a state in which dust adheres to the second wall portion 62 of the housing portion 60 . FIG. 5(B) shows the concept of the detection result output by the photodetector 50 in the state of FIG. 5(A). In this case, the light of the first emission color reflected and scattered by the second wall portion 62 is reduced by the adhering dust, so that the signal level detected by the first photodetector 51 is lower than the initial reference intensity Become.

Also, the adhering dust reduces the amount of light of the second emission color and the third emission color that reaches the second wall portion 62 and is absorbed. In addition, the light of the second emission color and the light of the third emission color that are reflected and scattered by the adhering dust are increased. Therefore, the signal levels detected by the second photodetector 52 and the third photodetector 53 are higher than the reference intensity in the initial state.

Therefore, the determination unit 131 determines whether the intensity of the light detected by the first photodetector 51 is less than the first reference intensity and the intensity of the light detected by the second photodetector 52 is greater than the second reference intensity. , it is further determined that dust is attached to the wall portion of the housing portion 60 in response to the fact that the intensity of the light detected by the third light detection portion 53 has increased above the third reference intensity. As a result, the detection device 10 can reduce the rate of erroneously detecting smoke when dust adheres to the interior of the housing portion 60, and can detect the occurrence of contamination of the housing portion 60 with high accuracy.

Dust and the like may adhere to the light emitting surface of the light source unit 40 or the light receiving surface of the photodetector 50 . In this case, the signal levels detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 are all lower than the reference intensity in the initial state.

Therefore, the determination unit 131 determines that the intensity of light detected by the first photodetector is reduced below the first reference intensity, the intensity of light detected by the second photodetector is below the second reference intensity, and the intensity of light detected by the second photodetector is reduced below the second reference intensity. In response to the fact that the intensity of the light detected by the three light detection units has decreased below the third reference intensity, the light source unit 40, the first light detection unit 51, the second light detection unit 52, or the third light detection unit 53 It is further determined that dust adheres. As a result, the detection device 10 can reduce the rate of erroneously detecting smoke when dust adheres to the light source unit 40 or the photodetector 50, and can accurately detect the generation of smoke.

As described above, the detection device 10 according to the present embodiment can accurately detect the generation of smoke. Here, if the detection device 10 immediately determines that a fire has occurred in response to detection of smoke generation, an erroneous detection may occur. For example, if food (meat, fish, etc.), water vapor, smoke from cigarettes, etc. is detected, and the occurrence of a fire is determined, an erroneous detection will occur. Therefore, the identifying unit 132 identifies whether the detected smoke is smoke from combustibles.

<Example of a state in which smoke of various colors has entered the housing portion 60>
FIG. 6 shows a cross-sectional view of the circuit board 30 and the accommodating portion 60 in this embodiment, and a fourth example of the detection result of the photodetector 50. As shown in FIG. FIG. 6A shows a state in which smoke has entered the internal space of the housing portion 60 . FIG. 6(B) shows the concept of the detection result output by the photodetector 50 in the state of FIG. 6(A). Here, the color of the smoke may differ depending on the source of the smoke. Since the photodetector 50 detects the scattered light of the three different emission colors, the detection signals of the three emission colors have different signal levels depending on the color of the smoke.

For example, when paper, cotton, etc. are burned, smoke of a color close to white is generated. Since white smoke reflects and scatters light of three emission colors, the signal levels detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 tend to increase. show. Also, when resins, electric wires, etc. are burned, smoke of a color close to black is generated. Since black smoke absorbs light of three emission colors, the signal levels detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 tend to decrease. Thus, the photodetector 50 outputs different detection results depending on the smoke generated when the object is not burning, the smoke when the object is burning, and the type of burning object.

Therefore, the identifying unit 132 compares the detection results of the first photodetector 51, the second photodetector 52, and the third photodetector 53 with the reference table stored in the storage unit 120, thereby It is possible to identify whether the smoke contained in is the smoke from the burning material. Since the reference table associates the type of the burned object with the detection result of the photodetector 50, the identification unit 132 identifies that the smoke contained in the outside air is the smoke from the burning material. If so, the type of burning object can be further identified.

Thereby, the fire determination unit 133 can determine whether the smoke is caused by cooking or the like, or by a fire, for example. Also, the fire determination unit 133 can determine whether or not a fire has occurred, for example, using the correspondence relationship between the type of combustible material and whether or not a fire has occurred. Note that it is desirable that the correspondence relationship between the type of combustible material and whether or not a fire has occurred is stored in advance in the storage unit 120 . Moreover, the reference table stored in the storage unit 120 may further include such a correspondence relationship.

Alternatively or additionally, the specifying unit 132 determines the difference between the intensity of the light detected by the first photodetector 51 and the first reference intensity, and the intensity of the light detected by the second photodetector 52. Based on the difference between the intensity and the second reference intensity and the difference between the intensity of the light detected by the third photodetector 53 and the third reference intensity, the color of the smoke contained in the outside air can be specified. good. In this case, the specifying unit 132 specifies the color of smoke based on the correspondence relationship between the color of smoke and the first intensity difference, the second intensity difference, and the third intensity difference. Note that it is desirable that the storage unit 120 stores the correspondence relationship between the color of smoke and the first intensity difference, the second intensity difference, and the third intensity difference.

Further, the specifying unit 132 may specify the color of smoke contained in the outside air based on the first intensity ratio, the second intensity ratio, and the third intensity ratio. In this case, the specifying unit 132 specifies the color of smoke based on the correspondence relationship between the color of smoke and the first intensity ratio, the second intensity ratio, and the third intensity ratio. Note that the storage unit 120 preferably stores the correspondence relationships between the color of smoke and the first intensity ratio, the second intensity ratio, and the third intensity ratio.

In this case, the fire determination unit 133 may determine whether or not a fire is occurring according to the color of smoke identified by the identification unit 132 . In this case, the fire determination unit 133 uses the correspondence relationship between the color of the smoke and whether or not there is a fire. It is desirable that such a correspondence relationship is stored in the storage unit 120 in advance.

As described above, the detection device 10 according to the present embodiment can also accurately detect the occurrence of fire. In addition, in the detection device 10 described above, an example in which the light source unit 40 emits white light including light of three emission colors of red, green, and blue has been described, but the present invention is not limited to this. The characteristics of scattering and reflection of smoke are different if the colors of emitted light are different. may In addition, the light emission colors included in the light source unit 40 may be four or more colors, and in this case, the photodetector 50 is also configured to detect light of four or more emission colors correspondingly. may be

In the detecting device 10 according to the present embodiment described above, an example in which the second wall portion 62 of the housing portion 60 is colored with the color including the first emission color at the position irradiated with the white light of the light source portion 40 will be described. However, it is not limited to this. Alternatively, the position irradiated with the white light may be colored with a color including the second emission color, or may be colored with a color including the third emission color. Coloring may be done by painting or pasting a seal or the like. Moreover, when the accommodating part 60 is resin, you may make it the molding color of a part of resin include a luminescent color.

Further, the position of the second wall portion 62 of the housing portion 60 that is irradiated with the white light may be colored with a predetermined coloring pattern. For example, part of the area of the second wall portion 62 irradiated with white light may be colored with a color including the first emission color. Since the area of the second wall portion 62 colored with the first emission color reflects the light of the first emission color, changing the area of the area changes the magnitude of the reference intensity in the initial state.

Therefore, it is desirable to predetermine the size of the region to be colored with the first emission color, the coloring pattern, and the like in the design stage, the manufacturing stage, the calibration stage, and the like of the detection device 10 . In this case, the colored pattern is desirably formed such that at least one of the first reference intensity, the second reference intensity, and the third reference intensity has a predetermined magnitude. By adjusting the magnitude of the reference intensity in advance in this way, the detection device 10 can perform smoke and fire detection, for example, within an appropriate range in which the sensitivity of the photodetector 50 is linear.

When the color of the detected smoke is black or close to black, the signal levels detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 decrease. In this case, the closer the smoke color is to black, the closer the signal level is to 0, and the S/N may be worse.

Therefore, when the signal levels detected by the first photodetector 51, the second photodetector 52, and the third photodetector 53 are all lower than the threshold, the control unit 130 activates the circuit that drives the light source 40. The signal level of the detection signal output by the photodetector 50 may be controlled to increase. In this case, the controller 130 increases the intensity of the white light emitted by the light source 40 . As a result, the detection device 10 can improve the S/N ratio and detect black or near-black smoke. If an amplifier is mounted after the photodetector 50, the controller 130 may control the amplifier to increase the amplification factor of the amplifier.

Even if the control unit 130 controls the drive circuit to increase the intensity of the white light from the light source unit 40, the signal level of the detection signal output by the photodetector 50 may remain reduced. . In this case, the control section 130 may determine that the light source section 40 has failed. For example, when the control unit 130 determines that the light source unit 40 is out of order, the control unit 130 supplies a corresponding control signal to the alarm unit 140 . As a result, the alarm unit 140 can generate an alarm that indicates the failure of the light source unit 40, and the user of the detection device 10 can quickly know the failure of the detection device 10. FIG.

Although the detecting device 10 according to the present embodiment described above has an example in which the control unit 130 includes the determining unit 131 and the specifying unit 132, the present invention is not limited to this. The control unit 130 may be configured to have either one of the determination unit 131 and the identification unit 132 .

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

10 detection device 20 main body 22 base portion 23 ceiling surface 24 cover portion 30 circuit board 40 light source portion 50 photodetector 51 first photodetection portion 52 second photodetection portion 53 third photodetection portion 60 housing portion 61 first wall portion 62 Second wall portion 70 Light shielding plate 110 Power supply circuit 120 Storage unit 130 Control unit 131 Judgment unit 132 Identification unit 133 Fire judgment unit 140 Alarm unit 141 Alarm drive circuit 142 Speaker 143 Indicator light

Claims (9)

a light source unit that emits white light including light of a first emission color, a second emission color, and a third emission color that are different from each other;
a housing portion having a wall portion forming an internal space into which outside air is introduced, wherein a position of the wall portion irradiated with the white light is colored with a color including the first emission color;
a first photodetector arranged at a position where the light from the light source is not directly irradiated inside the housing and detecting the intensity of the incident light of the first emission color;
a second photodetector arranged at a position where the light from the light source is not directly irradiated inside the housing, and detecting the intensity of the incident light of the second emission color;
a third light detection unit disposed at a position inside the accommodation unit where the light from the light source unit is not directly irradiated, the third light detection unit detecting the intensity of the incident light of the third emission color;
storing as a first reference intensity the intensity of light detected by the first light detection unit while the light source unit is emitting the white light in a state where outside air containing smoke is not introduced into the space; a storage unit that stores the intensity of light detected by the second photodetector as a second reference intensity and stores the intensity of light detected by the third photodetector as a third reference intensity;
The difference between the intensity of light detected by the first photodetector and the first reference intensity, the difference between the intensity of light detected by the second photodetector and the second reference intensity, and the third light a determination unit that determines whether smoke is contained in the outside air introduced into the storage unit based on the difference between the intensity of light detected by the detection unit and the third reference intensity. . 2. The detection device according to claim 1, wherein the first emission color, the second emission color, and the third emission color are red, green, and blue, respectively. The determination unit comprises a difference between the intensity of light detected by the first photodetector and the first reference intensity, a difference between the intensity of light detected by the second photodetector and the second reference intensity, and the Whether smoke is contained in the outside air introduced into the storage unit in response to a change in at least one of the difference between the light intensity detected by the third light detection unit and the third reference intensity 3. The detection device according to claim 1 or 2, which determines whether or not. The determination unit determines whether the intensity of the light detected by the first photodetector is lower than the first reference intensity and the intensity of the light detected by the second photodetector is higher than the second reference intensity. , determining that dust is adhered to the wall of the storage unit in response to the intensity of the light detected by the third light detection unit increasing above the third reference intensity. 4. The detection device according to any one of 3. The determination unit determines whether the intensity of light detected by the first light detection unit is less than the first reference intensity and the intensity of light detected by the second light detection unit is less than the second reference intensity. , the light source unit, the first light detection unit, the second light detection unit, or the third 5. The detection device according to any one of claims 1 to 4, wherein the detection device determines that dust adheres to the light detection section. In the storage unit, the first light detection unit, the second light detection unit, and the third light detection unit detect when smoke generated by burning an object for each type is introduced into the space. further storing, as a reference table, a table in which the intensity of the light obtained and the type of the object are associated with each other;
By comparing the intensity of the light detected by the first photodetector, the second photodetector, and the third photodetector with the reference table, it is possible to determine whether the smoke contained in the outside air is caused by the combustible material. Further comprising a specifying unit that specifies whether it is smoke,
6. A detection device according to any one of claims 1-5. When the specifying unit specifies that the smoke contained in the outside air is smoke caused by combustion, the first light detecting unit, the second light detecting unit, and the third light detecting unit detect 7. The detection apparatus of claim 6, further identifying the type of burning object by comparing light intensity to the reference table. a fire determination unit that determines whether or not a fire is occurring based on the identification result of the identification unit;
The detection device according to claim 6 or 7, further comprising: an alarm unit that issues an alarm to the outside in response to the fire judgment unit judging that a fire has occurred. a position of the wall portion of the accommodating portion that is irradiated with the white light is colored with a predetermined coloring pattern;
The colored pattern is formed so that at least one of the first reference intensity, the second reference intensity, and the third reference intensity has a predetermined magnitude.
9. A detection device according to any one of claims 1-8.

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