WO2013061968A1 - 煙感知器 - Google Patents

煙感知器 Download PDF

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Publication number
WO2013061968A1
WO2013061968A1 PCT/JP2012/077366 JP2012077366W WO2013061968A1 WO 2013061968 A1 WO2013061968 A1 WO 2013061968A1 JP 2012077366 W JP2012077366 W JP 2012077366W WO 2013061968 A1 WO2013061968 A1 WO 2013061968A1
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WO
WIPO (PCT)
Prior art keywords
light
smoke
light emitting
light receiving
unit
Prior art date
Application number
PCT/JP2012/077366
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
佳武 島田
阪本　浩司
Original Assignee
パナソニック株式会社
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Filing date
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013061968A1 publication Critical patent/WO2013061968A1/ja

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the present invention relates to a smoke detector.
  • Reference 1 Japanese Utility Model Publication No. 2-6394 proposes a photoelectric smoke detector in which a light emitting element and two light receiving elements are arranged in a dark box. Yes.
  • the photoelectric smoke detector when smoke flows into the dark box, the light emitted from the light emitting element is scattered by the smoke, and the scattered light is incident on the light receiving element. The presence or absence of smoke is detected by comparing the height. However, if insects or dust enter the darkroom, light scattered by the insects or dust may enter the light receiving element and cause false alarms. When two light receiving elements receive scattered light due to smoke in different light receiving areas, and the scattered light is received only in one of the light receiving areas, it is determined as an erroneous report due to insects or dust.
  • a separator is provided in the dark box in order to make the light receiving areas by the two light receiving elements independent.
  • the interior of the dark box is optically designed so that the light emitted from the light emitting element is reflected and does not enter the light receiving element.
  • the separator is arranged so as to partition the inside of the dark box, the optical design must be performed. There is a problem that it is difficult.
  • the provision of the separator plate increases the size of the dark box, thereby increasing the size of the entire smoke detector.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a small smoke detector with reduced false detection due to insects and dust.
  • the smoke detector of the present application includes a smoke detection chamber, a light emitting unit, a light receiving unit, and a determination unit.
  • the smoke sensing chamber suppresses the entry of light from the outside and allows the smoke to enter and exit.
  • the light emitting unit emits light to a plurality of detection areas in the smoke sensing chamber. Direct light from the light emitting part does not enter the light receiving part, but scattered light due to smoke that has flowed into the respective detection regions.
  • the determination unit determines whether smoke has entered the smoke sensing chamber based on the output of the light receiving unit.
  • a light limiting member is provided integrally with at least one of the light emitting unit and the light receiving unit, and the light range is limited by the light limiting member so that the plurality of detection regions do not overlap.
  • a plurality of the light emitting units are provided for one light receiving unit, and the plurality of light emitting units respectively irradiate light to corresponding detection areas.
  • the crossing angle formed by the optical axis of each of the light emitting units and the optical axis of the light receiving unit is set to be different from each other.
  • the plurality of light emitting units are arranged on the same side with respect to the optical axis of the light receiving unit on a plane including the optical axes of the plurality of light emitting units and the light receiving unit.
  • the plurality of light emitting units are arranged on both sides with respect to the optical axis of the light receiving unit on a plane including the optical axes of the plurality of light emitting units and the light receiving unit.
  • the determination unit controls light emission of the plurality of light emitting units so that the plurality of light emitting units do not emit light simultaneously. And it is also preferable that the said determination part determines the state in the said smoke sensing chamber based on the output of the said light-receiving part in the state which light-emitted each of the said several light emission part separately.
  • the determination unit causes the corresponding light emitting unit to emit light at a time interval shorter than a movement time necessary for movement of foreign substances other than smoke between the plurality of detection regions.
  • the determination unit may determine that smoke has entered the smoke sensing chamber when all the outputs of the light receiving unit in the state where each of the plurality of light emitting units individually emit light exceeds a threshold value. preferable.
  • the determination unit causes the plurality of light emitting units to emit light intermittently and performs a determination operation based on the output of the light receiving unit.
  • the determination unit causes any one of the light emitting units to emit light intermittently in a non-detection state. And when the output of the said light-receiving part exceeds a threshold value in the state in which any one said light-emitting part light-emitted, the said determination part will be required movement for foreign substances other than smoke to move among the said several detection area
  • the crossing angle formed by the optical axis of each of the light emitting units and the optical axis of the light receiving unit is set to be different from each other, and the determination unit determines the level of the output of the light receiving unit and the threshold value. By comparing, it is determined whether or not smoke has entered the smoke sensing chamber. And the ratio of the output of the light receiving part in the state where the light emitting part having a relatively small crossing angle emits the output of the light receiving part in the state in which the light emitting part having a relatively large crossing angle emits light
  • the determination unit determines that the smoke that has entered the smoke sensing chamber is black smoke and lowers the threshold value.
  • the determination unit sets at least one of the light emission time and the light emission amount of the light emitting unit having a relatively small crossing angle to be larger than that of the light emitting unit having a relatively large crossing angle. It is also preferable to do.
  • the determination unit emits only the light emitting unit having a relatively large intersection angle in a non-detected state. And when the output of the said light-receiving part exceeds a threshold value in the state which the said light-emitting part light-emitted, the said determination part is shorter than the movement time required in order to move foreign materials other than smoke between the said several detection area
  • a plurality of the light receiving units are provided for one light emitting unit, and the plurality of light receiving units respectively receive light from corresponding detection areas.
  • the crossing angle formed by the optical axis of each of the light receiving units and the optical axis of the light emitting unit is set to a different angle.
  • the plurality of light receiving units are arranged on the same side with respect to the optical axis of the light emitting unit on a plane including the optical axis of the light emitting unit and the optical axes of the plurality of light receiving units. Is also preferable.
  • a plurality of the light receiving units may be arranged on both sides with respect to the optical axis of the light emitting unit on a plane including the optical axis of the light emitting unit and the optical axes of the plurality of light receiving units. preferable.
  • the determination unit simultaneously receives the outputs of the plurality of light receiving units and determines the state in the smoke detection chamber based on the outputs of the plurality of light receiving units.
  • the determination unit simultaneously captures outputs of the plurality of light receiving units, outputs of some of the light receiving units exceed a threshold value, and outputs of other light receiving units are smaller than the threshold value. In this case, it is also preferable to determine that a foreign substance other than smoke has entered the smoke sensing chamber.
  • the determination unit simultaneously captures outputs of the plurality of light receiving units, and determines that smoke has entered the smoke detection chamber when outputs of all the light receiving units exceed a threshold value. preferable.
  • the crossing angle between the optical axis of each of the light receiving units and the optical axis of the light emitting unit is set to be different from each other, and the determination unit determines the level of the output of the light receiving unit and the threshold value. By comparing, it is determined whether or not smoke has entered the smoke sensing chamber.
  • the determination unit detects smoke detection. It is also preferable to determine the smoke entering the room as black smoke and lower the threshold.
  • the determination unit operates only one of the light receiving units among the plurality of light receiving units in a state where it has not detected that a foreign object has entered the smoke detection chamber, and takes in an output.
  • the captured output exceeds the threshold, it is also preferable to operate the other light receiving unit to capture the output.
  • FIG. 1 It is a top view which shows the principal part of the smoke detector of Embodiment 1.
  • A is explanatory drawing which showed typically the example of arrangement
  • (b) is a figure which shows the power distribution of the scattered light by smoke with comparatively large particle diameter
  • (c) is It is a figure which shows the power distribution of the scattered light by the smoke with comparatively small particle diameter.
  • (A) is explanatory drawing which showed typically the example of arrangement
  • (b) is the description which showed typically the example of arrangement
  • (A) (b) is explanatory drawing which showed typically the example of arrangement
  • (A) (b) is a time chart explaining operation
  • FIG. 10 is a time chart for explaining another operation of the fourth embodiment. 10 is a time chart for explaining another operation of the fourth embodiment. It is explanatory drawing which showed typically arrangement
  • FIG. 10 is an explanatory diagram schematically showing the arrangement of light emitting units and light receiving units in a fifth embodiment. 10 is a time chart for explaining the operation of the fifth embodiment.
  • FIG. 1 is a plan view schematically showing a main part of the smoke detector 1, which includes a smoke detection chamber 2, light emitting units 3 a and 3 b, a light receiving unit 4, a determination unit 5, It has.
  • the smoke detection chamber 2 is composed of an optical base 6 so that its cross section is circular in plan view.
  • the optical base 6 includes a substantially disc-shaped bottom plate 7 and a plurality of labyrinth walls 8.
  • the plurality of labyrinth walls 8 protrude from the outer peripheral portion 701 of the bottom plate 7 in a direction substantially orthogonal to the bottom plate 7 and surround the inner space. That is, the plurality of labyrinth walls 8 protrude in a direction from the outer peripheral portion 701 of the bottom plate 7 toward the center portion of the bottom plate 7, and each labyrinth wall 8 is separated at a predetermined interval along the outer peripheral portion 701 of the bottom plate 7.
  • a gap 9 is formed by providing a predetermined interval between adjacent labyrinth walls 8.
  • An outer peripheral portion 701 of the bottom plate 7 located in the gap 9 is formed as an opening 7011.
  • the gap 9 serves as an entrance / exit for smoke to flow from the outside to the inside of the smoke sensing chamber 2.
  • a bent portion 801 is provided at an intermediate portion of the labyrinth wall 8.
  • the labyrinth wall 8 is configured to reflect the light incident on the inside of the smoke sensing chamber 2 from the outside through the gap 9 toward the outside.
  • the labyrinth wall 8 has the bent portion 801 at the intermediate portion thereof, thereby suppressing the entry of light from the outside to the inside of the smoke sensing chamber 2.
  • a light-shielding wall that shields direct light between the light emitting units 3a and 3b and the light receiving unit 4 so that irradiation light from the light emitting units 3a and 3b does not directly enter the light receiving unit 4. 10 is provided.
  • two light emitting units 3a, 3b first light emitting unit 3a and second light emitting unit 3b
  • one light receiving unit 4 one light receiving unit 4
  • the number of light emitting units and light receiving units is not limited, and it is preferable that a plurality of light emitting units and at least one light receiving unit be arranged in the smoke sensing chamber 2.
  • the optical axis L3 of the light receiving unit 4, the first optical axis L1 of the light emitting unit 3a, and the second optical axis L2 of the light emitting unit 3b are on the same plane, and the light emitting unit 3a with respect to the optical axis L3 of the light receiving unit 4 , 3b are arranged so that the light axes 3a, 3b and the light receiving part 4 are arranged so that the optical axes L1, L2 of the light beams 3b, 3b intersect each other.
  • the optical axis L1 of the light emitting unit 3a and the optical axis L3 of the light receiving unit 4 intersect that is, the irradiation range (first irradiation range) S1 of the irradiated light from the light emitting unit 3a and the light receiving range S3 of the received light overlap.
  • the irradiation range (first irradiation range) S1 of the irradiated light from the light emitting unit 3a and the light receiving range S3 of the received light overlap.
  • the vicinity of the optical axis L2 of the light emitting unit 3b and the optical axis L3 of the light receiving unit 4, that is, the irradiation range (second irradiation range) S2 of the irradiation light from the light emitting unit 3b and the light reception range S3 of the received light overlap.
  • the irradiation range (second irradiation range) S2 of the irradiation light from the light emitting unit 3b and the light reception range S3 of the received light overlap.
  • the irradiation ranges S1 and S2 of the irradiation light (the first irradiation range S1 of the irradiation light from the first light emitting unit 3a and the irradiation light from the second light emitting unit 3b)
  • a light limiting member (so-called aperture) 11 for limiting the second irradiation range S2 is provided integrally with the light emitting portions 3a and 3b.
  • the emitted light of each light emission part 3a, 3b is irradiated to corresponding detection area
  • a light limiting member (so-called aperture) 12 for limiting the light receiving range S3 of the received light is provided integrally with the light receiving unit 4 so that the detection areas A1 and A2 do not overlap each other.
  • the light from each of the detection areas A1 and A2 enters the light receiving unit 4 through the opening 12a of the light limiting member 12.
  • the light limiting members 11 and 12 are provided in both the light emitting unit and the light receiving unit, respectively, but it is not always necessary to provide the light limiting members 11 and 12 in both the light emitting unit and the light receiving unit.
  • the light limiting member is provided in only one of the light emitting unit and the light receiving unit, and the range of light (either irradiated light or received light) can be limited so that a plurality of detection areas do not overlap, light emission
  • the light limiting member may be provided in only one of the light receiving portion and the light receiving portion.
  • the determination unit 5 has a function of controlling the light emission of each of the light emitting units 3 a and 3 b and a function of determining the presence or absence of smoke from the output of the light receiving unit 4.
  • the light emitting units 3a and 3b are alternately turned on at predetermined time intervals, and whether or not the amount of light received by the light receiving unit 4 exceeds a predetermined threshold value when the light emitting unit 3a or the light emitting unit 3b is lit. Determine whether. If the amount of light received by the light receiving unit 4 exceeds the threshold both when the light emitting unit 3a is lit and when the light emitting unit 3b is lit, the determination unit 5 determines that smoke is flowing into the smoke sensing chamber 2. Then, the smoke detection signal is issued to the outside.
  • the determining unit 5 determines that no smoke is flowing in. If the light receiving amount of the light receiving unit 4 does not exceed the threshold value both when the light emitting unit 3a is lit and when the light emitting unit 3b is lit, the determining unit 5 determines that no smoke is flowing into the smoke sensing chamber 2. To do.
  • the determination unit 5 determines that scattered light is detected only in one of the detection areas A1 and A2. Not judged as smoke. Note that the determination unit 5 causes the light emitting units 3a and 3b to emit light at a time interval shorter than the movement time necessary for movement of foreign substances (insects and dust) other than smoke between the two detection areas A1 and A2. Yes.
  • the output of the light receiving unit 4 exceeds the threshold value both when the light emitting unit 3a emits light and when the light emitting unit 3b emits light. There is no.
  • the smoke detector 1 of the present embodiment erroneous detection due to foreign matters other than smoke (such as insects and dust) is unlikely to occur, and smoke can be reliably detected.
  • the light limiting member 11 that limits the range of the irradiated light is provided so as to be integrated with each of the light emitting units 3 a and 3 b, and the light limiting member 12 that limits the range of the received light is integrated with the light receiving unit 4. Therefore, the smoke detector 1 can be reduced in size as compared with the case where the light limiting member is provided separately from the light emitting units 3a and 3b and the light receiving unit 4.
  • the light limiting member is provided separately from the light emitting units 3a and 3b and the light receiving unit 4, the light limiting member itself may cause stray light. Therefore, the light limiting member is used as the light emitting units 3a and 3b. In addition, the optical design is easier than in the case where the light receiving unit 4 is provided separately from the light receiving unit 4.
  • a plurality of light emitting units 3a and 3b are provided for the light receiving unit 4, and the plurality of light emitting units 3a and 3b irradiate light to the corresponding detection regions A1 and A2, respectively.
  • the number of light receiving parts 4 can be reduced as compared with the case where the light receiving part and the light emitting part are detected.
  • an angle ⁇ 1 formed by the optical axis L1 of the light emitting unit 3a and the optical axis L3 of the light receiving unit 4 and an angle formed by the optical axis L2 of the light emitting unit 3b and the optical axis L3 of the light receiving unit 4
  • the light emitting units 3a and 3b and the light receiving unit 4 are arranged so that ⁇ 2 is different.
  • the angle ⁇ 1 formed by the optical axis L1 of the light emitting unit 3a and the optical axis L3 of the light receiving unit 4 in the detection region A1 becomes an obtuse angle, and the light emitting unit 3b in the detection region A2.
  • the angle ⁇ 2 formed by the optical axis L2 of the light and the optical axis L3 of the light receiving unit 4 is an acute angle ( ⁇ 1> ⁇ 2).
  • 2 (b) and 2 (c) show the power distribution of scattered light when light strikes the smoke particles 20, and
  • FIG. 2 (b) shows the power distribution P for smoke with a relatively large particle diameter.
  • FIG. 2C shows the power distribution P in the case of smoke having a relatively small particle diameter. From this figure, when the particle size is large, the forward scattering component becomes large, and when the particle size is small, the forward scattering component becomes small, and it approaches the power distribution P that is scattered almost uniformly in all directions. I understand.
  • the output from the light receiving portion depends on the size of the particle diameter.
  • the magnitude of the signal will change greatly. Therefore, the output signal in the case of smoke with a small particle size is greatly different from the output signal in the case of smoke with a large particle size, but a larger output signal is obtained for smoke with a large particle size.
  • the presence of smoke can be detected without being affected by noise.
  • the angle formed between the incident light and the scattered light is relatively small, that is, when the angle formed between the optical axis of the light emitting unit and the optical axis of the light receiving unit is relatively small, the angle formed between the incident light and the scattered light is large.
  • the magnitude of the output signal is generally smaller than the case, the magnitude of the output signal does not change much depending on the size of the particle diameter, so that there is an advantage that even smoke having a small particle diameter can be easily detected.
  • the angle between the optical axis of the light emitting unit and the optical axis of the light receiving unit is different in each of the two detection areas A1 and A2, and the optical axis of the light emitting unit and the optical axis of the light receiving unit are formed.
  • the detection area A1 having a relatively large angle the influence of noise is reduced by increasing the signal level, and smoke having a large particle diameter is easily detected.
  • the detection region A2 in which the angle formed by the optical axis of the light emitting unit and the optical axis of the light receiving unit is relatively small the difference in signal level caused by the size of the particle size is small, so smoke with a relatively small particle size is generated. It becomes easy to detect.
  • a plane including the optical axis L1 of the light emitting unit 3a, the optical axis L1 of the light emitting unit 3b, and the optical axis L3 of the light receiving unit 4 (a plane parallel to the bottom plate 7).
  • a plurality of light emitting units 3 a and 3 b are arranged on the same side along the optical axis L ⁇ b> 3 of the light receiving unit 4.
  • one light shielding wall 10 (light shielding member) is provided so as to shield the radiation light from the light emitting portion 3a and the radiation light from the light emitting portion 3b from directly entering the light receiving portion 4, respectively.
  • Embodiment 2 of this application is demonstrated based on drawing.
  • a plurality of light emitting units 3a and 3b are provided for one light receiving unit 4 in order to provide a plurality of detection regions.
  • one light emitting unit is provided as shown in FIG.
  • a plurality of detection areas A1 and A2 are set by providing a plurality of light-receiving portions 4a and 4b for 3.
  • smoke flows into the smoke sensing chamber 2, and the optical axis L1 of the light emitting unit 3 and the optical axis of the light receiving unit (first light receiving unit) 4a (first optical axis of the first light receiving unit 4a) L3 intersect.
  • Detection that is, an overlapping range of irradiation light (first irradiation range of irradiation light from the light emitting unit 3) S1 and light receiving range of light reception (first light receiving range of light reception of the first light receiving unit 4a) S3
  • the irradiation light is scattered by the smoke in the detection region A1, and a part of the scattered light enters the light receiving unit 4a.
  • the vicinity of the optical axis L1 of the light emitting unit 3 and the optical axis (second optical axis of the second light receiving unit 4b) L4 of the light receiving unit (second light receiving unit) 4b that is, the irradiation range S1 of the irradiated light and the received light.
  • a light limiting member for limiting the irradiation range in which the light emitting unit 3 emits light and the light receiving units 4a and 4b so that the detection regions A1 and A2 do not overlap each other.
  • a light restricting member (not shown) is provided for restricting the light receiving range in which each receives light. That is, the light emitting unit 3 and the light limiting member are integrally provided so as to limit the irradiation range S1 of the irradiation light. The light emitted from the light emitting unit 3 is applied to the detection areas A1 and A2 through the opening of the light limiting member.
  • a light limiting member (not shown) for limiting the light receiving ranges S3 and S4 of the received light is provided integrally with the light receiving parts 4a and 4b, respectively, and is provided so as to be integrated with the light receiving parts 4a and 4b. Light from the corresponding detection areas A1 and A2 is incident through the opening of the light limiting member.
  • the determination unit 5 controls the light emission of the light emitting unit 3 and operates the light receiving units 4a and 4b to capture the outputs from the light receiving units 4a and 4b. Thereby, the determination part 5 is comprised so that the presence or absence of smoke may be detected based on the output of each light-receiving part 4a, 4b.
  • the determination unit 5 determines that smoke is present in the smoke detection chamber 2 when both of the output signals of the light receiving units 4a and 4b when the light emitting unit 3 is turned on exceed a predetermined threshold, and generates a smoke detection signal. Output to the outside.
  • the determination unit 5 is configured such that when both the output signals of the light receiving units 4a and 4b do not exceed the threshold when the light emitting unit 3 is turned on, only one of the light receiving units 4a and 4b exceeds the threshold. If so, determine that no smoke is present. Thereby, it is possible to reduce the possibility of erroneously detecting insects and dust that have entered the smoke detection chamber 2 as smoke. Moreover, since the light limiting member that limits the light range is provided so that the light emitting unit 3, the first light receiving unit 4a, and the second light receiving unit 4b are integrated, the light emitting unit 3 and the light receiving units 4a and 4b are provided. As compared with the case where the light limiting member is provided so as to be separate, the smoke detector 1 can be reduced in size and the optical design is facilitated.
  • each of the detection regions A1 and A2 is provided with a light receiving unit and a light emitting unit. Compared to the case of detecting with a set of parts, the number of light emitting parts 3 can be reduced, and the cost can be reduced. Further, when a plurality of light emitting units are provided for one light receiving unit, it is necessary to detect the presence or absence of smoke in each of the detection areas A1 and A2 by turning on the light emitting units one by one. Since a plurality of light receiving portions 4a and 4b are provided for one light emitting portion 3, it is possible to simultaneously detect the presence or absence of smoke in the detection areas A1 and A2.
  • a plurality of light emitting units or light receiving units are provided along the optical axis of a single light receiving unit or light emitting unit on a plane including the optical axes of the light emitting unit and the light receiving unit.
  • a plurality of light emitting units or light receiving units may be arranged on both sides of the light receiving unit or the light emitting unit along the optical axis.
  • light emitting units 3a and 3b are provided for the light receiving unit 4.
  • the plurality of light emitting units 3a and 3b are formed along the optical axis L3 of the light receiving unit 4 so that the optical axes L1, L2, and L3 of the light emitting units 3a and 3b and the light receiving unit 4 are formed on the same plane. It is arranged on both sides. In other words, the light emitting units 3a and 3b are disposed diagonally across the optical axis L3 so that the optical axes L1 and L2 are substantially parallel to each other.
  • Irradiation light is scattered by the smoke in A 2, and a part of the scattered light enters the light receiving unit 4.
  • a light limiting member (not shown) for limiting the irradiation range S1 of the irradiation light is provided integrally with the light emitting units 3a and 3b so that the two detection areas A1 and A2 do not overlap. It has been.
  • the emitted light of each light emission part 3a, 3b is irradiated to corresponding detection area
  • a light limiting member (not shown) for limiting the light receiving range S3 of the received light is provided so as to be integrated with the light receiving unit 4 so that the two detection areas A1 and A2 do not overlap. And the light from detection area
  • the determination unit 5 determines that scattered light is detected only in one of the detection areas A1 and A2. Not judged as smoke.
  • smoke generated by a fire or the like enters the smoke detection chamber 2
  • the flow of smoke is controlled by the labyrinth wall 8 or the like so that the smoke flows into both the detection regions A1 and A2.
  • A2 determines that smoke is present only when scattered light is detected in both.
  • the light limiting member for limiting the light range is provided integrally with the light emitting units 3a, 3b and the light receiving unit 4, the light limiting member is provided separately from the light emitting units 3a, 3b and the light receiving unit 4. Compared to the above, the smoke detector 1 can be miniaturized. In addition, the optical design is easier than in the case where the light limiting member that causes stray light is provided separately from the light emitting units 3 a and 3 b and the light receiving unit 4. In this embodiment, the light limiting member is provided on both the light emitting side and the light receiving side. However, the range of light (either irradiated light or received light) can be limited so that a plurality of detection areas do not overlap. In this case, the light limiting member may be provided on only one of the light emitting side and the light receiving side.
  • the optical axis L1 and L2 of the light emitting units 3a and 3b are substantially parallel and obliquely intersect with the optical axis L3 of the light receiving unit 4, the optical axis L1 of the light emitting unit 3a and the light receiving unit 4
  • An angle ⁇ 1 formed by the optical axis L3 and an angle ⁇ 2 formed by the optical axis L2 of the light emitting unit 3b and the optical axis L3 of the light receiving unit 4 are different from each other. That is, the angles ⁇ 1 and ⁇ 2 formed by the optical axis of the light emitting unit and the optical axis of the light receiving unit are different from each other in each of the detection areas A1 and A2.
  • the light emitting units 3a and 3b are arranged on the same side with respect to the optical axis L3 of the light receiving unit 4, the light axis on the light receiving side and the light on the light emitting side in the detection regions A1 and A2. If the angle formed by the axes is made different, the optical axis L2 of the light emitting unit 3b is arranged so as to obliquely intersect the optical axis L1 of the light emitting unit 3a. That is, useless sparse is generated between the detection areas A1 and A2. On the other hand, if the light emitting units 3a and 3b are arranged on both sides of the optical axis L3 as shown in FIG.
  • the light emitting units 3a and 3b are arranged so that the optical axes are parallel to each other.
  • the angle formed between the light receiving side optical axis and the light emitting side optical axis can be made different in the detection areas A1 and A2. Therefore, the light emitting units 3a and 3b can be arranged close to each other. Furthermore, a useless space between the detection areas A1 and A2 is reduced, and the overall size can be reduced.
  • the light receiving unit 4 and the light emitting units 3a and 3b are provided.
  • the light emitting unit 3 and the light receiving units 4a and 4b may be provided.
  • the smoke detector includes a smoke detection chamber, a light emitting unit, and a light receiving unit.
  • the smoke sensing chamber suppresses the entrance of light from the outside and allows smoke to enter and exit.
  • the light emitting unit emits light to a plurality (two in the above-described embodiment) of detection areas in the smoke sensing chamber. Direct light from the light emitting part does not enter the light receiving part, but scattered light due to smoke flowing into each detection region enters.
  • a light limiting member that limits a light range so that a plurality of detection regions do not overlap is provided integrally with at least one of the light emitting unit and the light receiving unit.
  • the light limiting member that limits the light range so that the plurality of detection regions do not overlap is provided integrally with at least one of the light receiving unit and the light emitting unit, it is separate from the light receiving unit or the light emitting unit. Since the light limiting member can be made smaller than when the light limiting member is provided, the smoke detector 1 can be downsized. Further, optical design is facilitated as compared with the case where the light limiting member causing stray light is provided separately from the light receiving unit or the light emitting unit.
  • a light receiving part and a plurality of light emitting parts are provided. Further, it is also preferable that the plurality of light emitting units irradiate light to the corresponding detection areas.
  • the number of light receiving parts can be reduced and the cost can be reduced as compared with the case where each of the plurality of detection areas is detected by a pair of light receiving parts and light emitting parts.
  • a light emitting part and a plurality of light receiving parts are provided. It is also preferable that the plurality of light receiving units receive light from the corresponding detection areas.
  • the number of light emitting units can be reduced and the cost can be reduced as compared with the case where each of the plurality of detection areas is detected by a pair of light receiving units and light emitting units.
  • the light receiving unit and the plurality of light emitting units it is necessary to detect the presence or absence of smoke in each detection region by alternately lighting the light emitting units one by one. Since the light receiving unit is provided, the presence or absence of smoke in a plurality of detection areas can be detected simultaneously.
  • the angles formed by the optical axis of the light emitting unit and the optical axis of the light receiving unit are different from each other in each of the plurality of detection regions.
  • the scattering characteristics of light due to smoke vary depending on the particle diameter.
  • the difference in the scattering components becomes smaller.
  • the angle formed between the optical axis of the light emitting unit and the optical axis of the light receiving unit is different from each other in each of the plurality of detection regions, the angle formed between the optical axis of the light emitting unit and the optical axis of the light receiving unit is relatively large. In the detection region, by increasing the scattering component due to smoke having a large particle diameter, the output level of the light receiving unit can be increased, and smoke having a large particle diameter can be easily detected.
  • any one of the light emitting part and the light receiving part is provided in plural.
  • the plurality of light emitting units are arranged on the same side along the optical axis of the light receiving unit on the plane including the optical axes of the light emitting unit and the light receiving unit, or the plurality of light receiving units are the light emitting unit. It is also preferable that they are arranged on the same side along the optical axis.
  • a plurality of any one of the light emitting part and the light receiving part is provided.
  • a plurality of light emitting units are arranged on both sides along the optical axis of the light receiving unit on a plane including the optical axes of the light emitting unit and the light receiving unit, or the plurality of light receiving units emit light. It is also preferable that they are arranged on both sides along the optical axis of the part.
  • a plurality of detection regions In order to make the angle between the optical axis of the light emitting unit and the optical axis of the light receiving unit different from each other, the optical axes of the plurality of light emitting units or light receiving units must be arranged so as to intersect each other, Useless space is created between areas.
  • the light receiving unit 4 and the two light emitting units 3 a and 3 b are provided, and the irradiation ranges S ⁇ b> 1 and S ⁇ b> 2 by the light emitting units 3 a and 3 b overlap the light receiving range S ⁇ b> 4 of the light receiving unit 4.
  • the determination unit 5 has a function of controlling the light emission of each of the light emitting units 3 a and 3 b and a function of determining the presence or absence of smoke from the output of the light receiving unit 4.
  • the determination unit 5 does not simultaneously emit a plurality of (two in the present embodiment) light emitting units 3a and 3b, and based on the output of the light receiving unit 4 in a state where each of the light emitting units 3a and 3b emits light individually. In addition, the state in the smoke sensing chamber 2 is determined.
  • the determination unit 5 sets the detection areas A1 and A2 at a time interval shorter than a movement time necessary for moving foreign substances (such as dust and insects) other than smoke between the detection areas A1 and A2.
  • the corresponding light emitting units 3a and 3b emit light.
  • the determination part 5 exceeds the threshold value in the state which made any light emission part (light emission part 3a or light emission part 3b) light-emit, and another light emission part (light emission part 3b or light emission).
  • the output of the light receiving unit 4 in a state where the unit 3a is caused to emit light is smaller than the threshold value, it is determined that a foreign substance other than smoke has entered the smoke sensing chamber 2.
  • the light emission interval of the light emitting units 3a and 3b it is erroneously detected that smoke has entered the smoke sensing chamber 2. Therefore, it is preferable to set the light emission interval of the light emitting units 3a and 3b to a time shorter than the moving time required for foreign substances other than smoke to move between the detection areas A1 and A2. As shown in FIG. 6A, if the light emission interval of the light emitting units 3a and 3b is set to a time T1 shorter than the moving time, the dust D is detected in the detection area A1 until the light emission interval T1 elapses. Cannot move in.
  • the output of the light receiving unit 4 when the light emitting unit 3a emits light exceeds the threshold value because the dust D has entered the detection region A1, the dust D is detected in the detection region A2 until the light emission interval T1 elapses. Therefore, the output of the light receiving unit 4 when the light emitting unit 3b emits light does not exceed the threshold value. Therefore, when foreign matter (dust, insects, etc.) other than smoke enters the inside of the smoke detection chamber 2, the output of the light receiving unit 4 has a threshold value both when the light emitting unit 3a emits light and when the light emitting unit 3b emits light. Therefore, the possibility that the determination unit 5 erroneously detects that smoke has entered can be reduced.
  • the determination unit 5 causes the corresponding light emitting units 3a and 3b to emit light at a time interval shorter than the moving time necessary for foreign substances other than smoke to move between the plurality of detection areas A1 and A2. Then, the determination unit 5 determines that smoke has entered the smoke detection chamber 2 when all the outputs of the light receiving unit 4 in the state where each of the plurality of light emitting units 3a and 3b individually emit light exceeds the threshold value. To do.
  • the determination unit 5 since the output of the light receiving unit 4 exceeds the threshold only when the light emitting unit 3a emits light, the determination unit 5 has foreign matter (dust, insects, etc.) other than smoke entering the smoke sensing chamber 2. Is determined. In the period W3, the output of the light receiving unit 4 exceeds the threshold when both the light emitting units 3a and 3b emit light. In this case, the determination unit 5 determines that smoke has entered the smoke sensing chamber 2. When smoke accompanying a fire enters the smoke detection chamber 2, the smoke is present in the smoke detection chamber 2 substantially uniformly, so that the determination unit 5 causes the light emitting units 3a and 3b to emit light individually. When all the outputs of the light receiving unit 4 exceed the threshold value, it is determined that smoke has entered the smoke sensing chamber 2, and false detection can be reduced.
  • the determination unit 5 causes the plurality of light emitting units 3a and 3b to emit light intermittently at a predetermined period T3, and performs a determination operation based on the output of the light receiving unit 4 when the light emitting units 3a and 3b emit light.
  • the power consumption can be reduced compared to the case where the light emitting units 3a and 3b are kept on.
  • the determination unit 5 when the determination unit 5 does not detect that a foreign object has entered the smoke sensing chamber 2, only one of the light emitting units 3a emits light, and the output of the light receiving unit 4 emits light when the light emitting unit 3a emits light. When the threshold value is exceeded, it is also preferable to cause the other light emitting unit 3b to emit light.
  • the determination unit 5 when the light emitting unit 3b is caused to emit light, the determination unit 5 causes the light emitting unit 3b to emit light at a time interval shorter than the moving time necessary for the movement of foreign substances other than smoke between the detection areas A1 and A2. ing.
  • the determination unit 5 causes only one of the light emitting units (for example, the light emitting unit 3a) to emit light during the period W4 during which no smoke is detected, and the light receiving unit 4 when the light emitting unit 3a emits light.
  • the output exceeds the threshold (periods W5 and W6), the other light emitting units 3b are also caused to emit light.
  • the determining unit 5 determines that a foreign substance other than smoke has entered, and the light receiving unit 4b emits light when the light emitting unit 3b emits light.
  • the determination unit 5 determines that smoke has entered.
  • the determination unit 5 causes the other light emitting unit 3b to emit light and captures the output of the light receiving unit 4, and smoke is generated based on the output. Therefore, it is possible to reduce the possibility of erroneously detecting foreign matter such as smoke and insects as smoke.
  • the crossing angles ⁇ 1 and ⁇ 2 formed by the optical axes L1 and L2 of the light emitting units 3a and 3b and the optical axis L3 of the light receiving unit 4 are set to different angles.
  • the intersection formed by the optical axis L2 of the light emitting unit 3b and the optical axis L3 of the light receiving unit 4 is larger than the crossing angle ⁇ 1 formed by the optical axis L1 of the light emitting unit 3a and the optical axis L3 of the light receiving unit 4.
  • the angle ⁇ 2 is smaller ( ⁇ 1> ⁇ 2).
  • the power distribution of scattered light varies depending on the size of the particle diameter.
  • the white smoke (smoke) generated at the initial stage of the fire has a larger smoke particle size than the black smoke generated during the expansion of combustion. Therefore, the power distribution of the scattered light due to the white smoke is a power distribution P in which the forward scattered component is large as shown in FIG. 2B, and the power distribution P of the scattered light due to the black smoke is as shown in FIG. As shown in c), the power distribution is scattered almost uniformly in all directions.
  • black smoke has a higher light attenuation rate than white smoke, if the smoke density is the same, the intensity of scattered light incident on the light receiving unit 4 is smaller for black smoke than for white smoke. Become.
  • FIG. 10A shows the relationship between the scattered light intensity incident on the light receiving unit 4 when black smoke enters and the smoke density
  • FIG. 10B enters the light receiving unit 4 when white smoke enters.
  • the relationship between scattered light intensity and smoke density is shown.
  • a characteristic E in FIGS. 10A and 10B shows the scattered light intensity in a state where the light emitting unit 3a having a relatively large crossing angle emits light
  • a characteristic F in FIGS. The scattered light intensity in a state where the light emitting part 3b having a relatively small crossing angle emits light is shown.
  • the intensity of scattered light incident on the light receiving unit 4 is higher when light is emitted from the light emitting unit 3b having an acute crossing angle than when the light emitting unit 3a has an obtuse crossing angle. It is significantly smaller.
  • the change in scattered light intensity due to the crossing angle is smaller than in the case of white smoke, the light is incident on the light receiving unit 4 when the light emitting unit 3a emits light and when the light emitting unit 3b emits light.
  • the difference in scattered light intensity is smaller than that of white smoke.
  • the ratio of the output c3 of the light receiving unit 4 in the light emitting state of the light emitting unit 3b to the output c4 of the light receiving unit 4 in the light emitting state of the light emitting unit 3a is (c3 / C4).
  • the ratio of the output c1 of the light receiving unit 4 in the light emitting state of the light emitting unit 3b to the output c2 of the light receiving unit 4 in the light emitting state of the light emitting unit 3a is (c1 / C2), which is larger than the ratio (c3 / c4) in the case of white smoke.
  • the determination part 5 the said light reception in the state which the light emission part 3b with a relatively small cross angle light-emitted with respect to the output of the light reception part 4 in the state in which the light emission part 3a with a relatively large cross angle light-emitted is carried out.
  • the ratio of the output of the part is compared with a predetermined reference value.
  • the determination unit 5 determines that black smoke has entered the smoke detection chamber 2, and the type of smoke that has entered the smoke detection chamber 2 (white smoke) Or black smoke). And when it is discriminated as black smoke, since the amount of light incident on the light receiving unit 4 is lower when black smoke enters than when white smoke enters, the determination unit 5 sets a threshold for determining the presence or absence of smoke. Even in the case of black smoke that has been reduced and the output of the light receiving unit 4 is reduced, the presence of smoke can be reliably detected.
  • the determination unit 5 it is also preferable that at least one of the light emission time and the amount of emitted light of the light emitting unit 3b having a relatively small crossing angle is made larger than that of the light emitting unit 3a having a relatively large crossing angle.
  • the output of the light receiving unit 4 when white smoke flows in is considered to be small. .
  • At least one of the light emission time and the light emission amount of the light emitting unit 3b is made larger than that of the light emitting unit 3a, thereby increasing the output of the light receiving unit 4 when the light emitting unit 3b emits light. Therefore, it is possible to reduce smoke detection omission.
  • the output of the light receiving unit 4 when the light emitting unit 3a emits light is larger than the output of the light receiving unit 4 when the light emitting unit 3a emits light.
  • the amount of attenuation of light is larger than that of white smoke. Therefore, the output of the light receiving unit 4 when the light emitting unit 3a emits light is lower when black smoke enters than when white smoke enters. is doing.
  • the determination unit 5 emits any one light emitting unit as shown in FIG. However, it is preferable to emit only the light emitting portion 3a having a relatively small crossing angle. By causing only one of the plurality of light emitting units 3a and 3b to emit light, power consumption can be reduced. Further, when the light emission amount of the light emitting unit 3b is increased as shown in FIG. 11, the power consumption can be further reduced by causing only the light emitting unit 3a having a small light emission amount to emit light.
  • the determination unit 5 lights only the light emitting unit 3a in the non-detection state, power consumption can be reduced. Further, when the light emission amount of the light emission unit 3b having a smaller crossing angle than the light emission unit 3a is larger than that of the light emission unit 3a, only the light emission unit 3a having a smaller light emission amount in the non-detection state is turned on. Electric power can be further reduced. In addition, when the output of the light receiving unit 4 exceeds the threshold value with only the light emitting unit 3a turned on, the determination unit 5 turns on the light emitting units 3a and 3b separately and turns on the light emitting units 3a and 3b, respectively. Since it is determined whether or not smoke is present based on the output of the output unit 4 in the state where it has been, the presence or absence of smoke can be reliably detected.
  • the determination unit 5 causes the light emitting unit 3a having a relatively large intersection angle ⁇ 1 with the optical axis of the light receiving unit 4 to emit light (step ST1). Whether or not the entry of a foreign object is detected by comparing the output Y1 of the light receiving unit 4 (first output of the light receiving unit 4) Y1 at the time of issuing the light emitting unit 3a with a predetermined threshold (first predetermined threshold) Z1. Is determined (step ST2). If the output Y1 of the light receiving unit 4 is smaller than the predetermined threshold Z1 (no in step ST2), the determination unit 5 determines that nothing has entered the smoke sensing chamber 2 (step ST3). .
  • step ST2 determines that something has entered the inside of the smoke sensing chamber 2, and turns on the light emitting unit 3b. Light is emitted (step ST4). At this time, the output (second output of the light receiving unit 4) Y2 of the light receiving unit 4 when the light emitting unit 3b is issued is compared with a predetermined threshold (second predetermined threshold) Z2 (step ST5).
  • the determination unit 5 determines the output Y1 of the light receiving unit 4 during the light emission of the light emitting unit 3a and the light emitting unit 3b. The level is compared with the output Y2 of the light receiving unit 4 during light emission (step ST6). If the output Y2 of the light receiving unit 4 during light emission of the light emitting unit 3b is larger than the output Y1 of the light receiving unit 4 during light emission of the light emitting unit 3a (yes in step ST6), the determination unit 5 It is determined that black smoke has entered (step ST7).
  • the determination unit 5 compares the level of the output Y2 of the light receiving unit 4 during the light emission of the light emitting unit 3b with the alarm threshold value (first alarm threshold value) V1 during the black smoke fire (step ST8).
  • the determination unit 5 determines that smoke from the fire has entered the smoke detection chamber 2. (Step ST9). If the output Y2 of the light receiving unit 4 is smaller than the alarm threshold value V1 for black smoke fire (no in step ST8), the determination unit 5 determines that thin smoke has entered the smoke sensing chamber 2 (step ST12). ).
  • the determination unit 5 Determines that white smoke has entered the smoke sensing chamber 2 (step ST10). Further, the determination unit 5 compares the level of the output Y2 of the light receiving unit 4 when the light emitting unit 3b emits light with the alarm threshold value V2 during white smoke fire (step ST11). At this time, if the output Y2 of the light receiving unit 4 exceeds the white smoke fire alarm threshold V2 (yes in step ST11), it is determined as smoke due to fire (step ST9).
  • step ST11 if the output Y2 of the light receiving unit 4 at the time of light emission of the light emitting unit 3b is smaller than the alarm threshold value V2 at the time of white smoke fire (no in step ST11), foreign matter other than smoke (dust or dust) It is determined that a bug or the like has entered the smoke sensing chamber 2 (step ST13).
  • step ST5 if the output Y2 of the light receiving unit 4 is equal to or less than the predetermined threshold value Z2, it is determined that foreign matter other than smoke (dust, insects, etc.) has entered the smoke sensing chamber 2 (step ST13).
  • the light emitting unit 3 and the light receiving units 4a and 4b are provided, and regions where the light receiving range S3 of the light receiving unit 4a and the irradiation range S1 by the light emitting unit 3 overlap are defined as detection regions A1 and A2.
  • a region where the light receiving range S4 of each light receiving unit 4b and the irradiation range S1 by the light emitting unit 3 overlap is defined as a detection region A2.
  • the determination unit 5 has a function of controlling light emission of the light emitting unit 3 and a function of determining the presence or absence of smoke from the outputs of the light receiving units 4a and 4b.
  • the determination unit 5 operates the light receiving units 4a and 4b at the same time with the light emitting unit 3 emitting light, and simultaneously captures the outputs of the light receiving units 4a and 4b, and detects smoke based on the outputs of the light receiving units 4a and 4b.
  • the state in the chamber 2 is determined.
  • the light emitting unit 3 and the plurality of light receiving units 4a and 4b are provided, and the plurality of light receiving units 4a and 4b receive light from the corresponding detection areas A1 and A2, respectively.
  • the plurality of light receiving units 4a and 4b receive light from the corresponding detection areas A1 and A2, respectively.
  • the plurality of light receiving units 4 a and 4 b are arranged on the same side with respect to the optical axis of the light emitting unit 3 on a plane including the optical axes of the plurality of light receiving units 4 a and 4 b and the light emitting unit 3. Has been.
  • one light shielding wall is provided to shield the radiation light from the light emitting unit 3 from directly entering the light receiving units 4a and 4b. In this case, it is not necessary to provide a plurality of light shielding walls that cause stray light, and optical design can be easily performed.
  • the plurality of light receiving units 4a and 4b are arranged along the optical axis of the light emitting unit 3 on the plane including the optical axes of the plurality of light receiving units 4a and 4b and the light emitting unit 3. It is also preferable to arrange them on both sides.
  • the light receiving units 4a and 4b are arranged so that their optical axes are parallel to each other.
  • the angle formed by the light receiving side optical axis and the light emitting side optical axis can be made different. Therefore, even when it is desired to make the angle between the optical axis on the light receiving side and the optical axis on the light emitting side different in the detection areas A1 and A2, the plurality of light receiving parts 4a and 4b can be arranged close to each other, and the detection areas A1 and A2 As a result, the wasteful space between the two can be reduced, and the overall size can be reduced.
  • the determination part 5 takes in the output of several light-receiving part 4a, 4b simultaneously, and determines the state in the smoke detection chamber 2 based on the output of several light-receiving part 4a, 4b, and one light emission
  • the unit 3 can monitor the states of the plurality of detection areas A1 and A2.
  • the determination unit 5 simultaneously captures the outputs of the plurality of light receiving units 4a and 4b, the outputs of some of the light receiving units exceed the threshold value, and the outputs of the other light receiving units are smaller than the threshold value, other than smoke Is determined to have entered the smoke sensing chamber 2.
  • the output of all the light receiving parts 4a and 4b is expected to increase.
  • dust or insects enter the inside of the smoke detection chamber 2
  • a plurality of detection areas are detected.
  • the possibility that dust and insects enter A1 and A2 at the same time is expected to be low.
  • the determination unit 5 determines that foreign matter other than smoke (dust, insects, etc.) 2 is determined to have entered, and the possibility of erroneous determination that smoke has entered can be reduced.
  • the determination unit 5 determines that the output of the light receiving units 4a and 4b simultaneously received is below the threshold value. It is determined that nothing has entered the sensing chamber 2.
  • the determination unit 5 determines that smoke has entered the smoke sensing chamber 2. To do.
  • the angle ⁇ 1 formed by the optical axis of the light receiving unit 4a and the optical axis of the light emitting unit 3 is different from the angle ⁇ 2 formed by the optical axis of the light receiving unit 4b and the optical axis of the light emitting unit 3. 3 and light receiving portions 4a and 4b are arranged.
  • the angle ⁇ 2 formed by the optical axis of the light receiving unit 4b and the optical axis of the light emitting unit 3 is smaller than the angle ⁇ 1 formed by the optical axis of the light receiving unit 4a and the optical axis of the light emitting unit 3. ing.
  • the light receiving unit 4b having a small crossing angle has a smaller incident light amount than the light receiving unit 4a having a large crossing angle. Since the sensitivity of the light receiving unit 4b is set higher than that of the light receiving unit 4a, the output of the light receiving unit 4a and the output of the light receiving unit 4b are substantially the same in the period W15. On the other hand, when black smoke enters, the incident light amounts of the light receiving portions 4a and 4b become substantially the same, so that the output of the light receiving portion 4b is output in the period W16 by the amount that the sensitivity of the light receiving portion 4b is set higher. Is getting bigger.
  • the determination unit 5 determines that white smoke has entered the smoke sensing chamber 2.
  • the ratio of the output of the light receiving unit 4b having a relatively small crossing angle to the output of the light receiving unit 4a having a relatively large crossing angle is smaller than the predetermined reference value.
  • the determination unit 5 determines that black smoke has entered the smoke sensing chamber 2.
  • the determination unit 5 determines whether or not smoke has entered the smoke sensing chamber 2 by comparing the output of the light receiving units 4a and 4b with the threshold value. If it is determined that black smoke has entered, it is also preferable to lower the threshold value.
  • the determination unit 5 can suppress the smoke detection omission by reducing the threshold value for determining the presence or absence of smoke.
  • the determination unit 5 operates only one of the light receiving units 4a and 4b in a state where it has not detected that a foreign object has entered the inside of the smoke detection chamber 2, and takes in an output. When the captured output exceeds the threshold, the other light receiving unit 4b is operated to capture the output.
  • the determination unit 5 operates the plurality of light receiving units 4a and 4b to determine whether smoke is present based on the outputs of the light receiving units 4a and 4b. Therefore, the presence or absence of smoke can be reliably detected.
  • two detection areas are set in the smoke detection chamber.
  • the light receiving section and the light emitting section may be configured so that three or more detection areas exist.
  • a plurality of detection regions are provided by providing a plurality of light emitting units for one light receiving unit or by providing a plurality of light receiving units for one light emitting unit.
  • a scattered light may be detected by providing one light receiving part and one light emitting part in each of the plurality of detection regions.
  • the smoke sensing chamber 2 is structured so as to be covered with the labyrinth wall 8 as shown in FIG. 1.
  • the present invention is applied to such a smoke sensing chamber 2. It does not limit what you do.
PCT/JP2012/077366 2011-10-24 2012-10-23 煙感知器 WO2013061968A1 (ja)

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