JP2010044536A - Smoke detector - Google Patents

Abstract

Provided is a smoke detector capable of making smoke detection sensitivity as constant as possible even when the ambient temperature of a light emitting unit changes.
A main body case, a light emitting portion that emits light to a detection space in the main body case, a light receiving portion that receives light scattered from the light emitting portion due to smoke that has entered the detection space, and A control unit that controls the light emitting unit to emit light to the detection space, and determines that smoke has entered the detection space when the output from the light receiving unit at this time is equal to or greater than a predetermined smoke detection threshold; A temperature detector for detecting the ambient temperature of the light emitting unit, and adjustment information for adjusting the ambient temperature of the light emitting unit, the adjustment information corresponding to individual differences of the light emitting unit being stored An information storage unit, and the control unit corrects the smoke detection threshold from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.
[Selection] Figure 4

Description

  The present invention relates to a smoke detector provided with a photoelectric sensor.

  Conventionally, as a smoke detector installed on a ceiling or the like, a main body case, a light emitting unit that emits light to a detection space in the main body case, and scattering of light from the light emitting unit due to smoke that has entered the detection space Some have a light receiving portion for receiving light.

Then, light is emitted from the light emitting unit to the detection space, and the scattered light generated by the smoke in the detection space is incident on the light receiving unit, and when the output from the light receiving unit at this time is equal to or greater than a predetermined smoke detection threshold It is determined that smoke has entered the space (for example, see Patent Document 1).
JP-A-11-312281

  However, the conventional smoke detector does not pay attention to the fact that the amount of light emitted differs depending on the ambient temperature of the light emitting unit, and the smoke detection sensitivity changes due to the change of the ambient temperature of the light emitting unit. There is a problem.

  The present invention has been made in view of such circumstances, and provides a smoke detector capable of making the detection sensitivity of smoke as constant as possible even when the ambient temperature of the light emitting unit changes. To do.

  In order to solve the above-described conventional problems, in a smoke detector according to the present invention, a main body case, a light emitting unit that emits light to a detection space in the main body case, and the light emission by smoke that has entered the detection space. A light-receiving unit that receives scattered light from the light-receiving unit, and the light-emitting unit to emit light to the detection space, and when the output from the light-receiving unit is equal to or greater than a predetermined smoke detection threshold A control unit that determines that smoke has entered the detection space, a temperature detector that detects the ambient temperature of the light emitting unit, and adjustment information for the ambient temperature of the light emitting unit, An adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, the control unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit, Smoke detection threshold was corrected

  The following points are also characteristic.

(1) The adjustment information is a table or calculation information in which the ambient temperature of the light emitting unit is associated with a smoke detection threshold, and the control unit corresponds to the ambient temperature of the light emitting unit detected by the temperature detecting unit. Reading the smoke detection threshold value from the adjustment information storage unit and setting the smoke detection threshold value as the predetermined smoke detection threshold value.

(2) An input unit that inputs information from the adjustment information writing device, and an output unit that outputs an output from the light receiving unit to the adjustment information writing device, and the control unit is configured to output the smoke detector. When a power setting command is acquired from the adjustment information writing device via the input unit in the test mode, light is emitted from the light emitting unit to the detection space, and a light receiving signal output from the light receiving unit at this time Is output to the adjustment information writing device via the output unit, the adjustment information generated by the adjustment information writing device based on the output from the light receiving unit is input via the input unit, and the input Storing the adjusted information in the adjustment information storage unit.

(3) Upon acquiring the power setting command, the control unit sequentially emits light from the light emitting unit to the detection space at two or more points with different intensities.

(4) The adjustment information generated by the adjustment information writing device is information generated based on a light reception signal output from the light receiving unit when the temperature of the light emitting unit is changed by two or more points. .

(5) A light emission characteristic detection unit that detects the light emission characteristic of the light emission unit is provided, and the adjustment information storage unit includes adjustment information for the ambient temperature of the light emission unit corresponding to the detection result of the light emission characteristic detection unit. The control unit reads out adjustment information corresponding to the detection result of the light emission characteristic detection unit from the adjustment information storage unit, and corrects the smoke detection threshold.

(6) A light emission characteristic detection unit that detects a light emission characteristic of the light emission unit is provided, and the control unit generates the adjustment information according to a detection result by the light emission characteristic detection unit, and stores the adjustment information in the adjustment information storage. Remember to store.

(7) The light emission characteristic detection unit detects a light emission characteristic of the light emitting unit by detecting a light emission level of each light emitting unit when power supplied to the light emitting unit is changed by two or more points.

(8) The light emission characteristic detection unit detects a light emission characteristic of the light emitting unit by detecting a light emission level of each of the light emitting units when the temperature of the light emitting unit is changed by two or more points.

(9) The light emission characteristic detecting unit detects a light emission level of the light emitting unit when the smoke detector is in a test mode.

  Further, in the smoke detector according to the present invention, the main body case, the light emitting portion that emits light to the detection space in the main body case, and the light scattered from the light emitting portion due to the smoke that has entered the detection space. A light-receiving unit that receives light, and a control unit that controls the light-emitting unit to emit light to the detection space, and detects smoke intrusion into the detection space based on an output from the light-receiving unit at this time; A temperature detector for detecting the ambient temperature of the light emitting unit, and adjustment information for adjusting the ambient temperature of the light emitting unit, the adjustment information corresponding to individual differences of the light emitting unit being stored An information storage unit, and the control unit corrects the output of the light emitting unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.

  In this case, the light emitting unit includes a variable amplifier that amplifies the control signal of the control unit so that the power can be adjusted, and a light emitting element that emits light based on the control signal whose power is adjusted by the variable amplifier. Further, the output of the light emitting unit is corrected by controlling the variable amplifier from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.

  Further, in the smoke detector according to the present invention, the main body case, the light emitting portion that emits light to the detection space in the main body case, and the light scattered from the light emitting portion due to the smoke that has entered the detection space. A light-receiving unit that receives light, and a control unit that controls the light-emitting unit to emit light to the detection space, and detects smoke intrusion into the detection space based on an output from the light-receiving unit at this time; A temperature detector for detecting the ambient temperature of the light emitting unit, and adjustment information for adjusting the ambient temperature of the light emitting unit, the adjustment information corresponding to individual differences of the light emitting unit being stored An information storage unit, and the control unit corrects the output of the light receiving unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.

  In this case, the light receiving unit includes a light receiving element and a variable amplifier that amplifies the output of the light receiving element, and the control unit detects the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. Thus, the output of the light receiving unit is corrected by controlling the variable amplifier.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the ambient temperature of a light emission part changes, the smoke detector which can make the detection sensitivity of smoke as constant as possible can be provided.

  The present invention includes a main body case, a light emitting unit that emits light to the detection space in the main body case, a light receiving unit that receives light scattered from the light emitting unit due to smoke that has entered the detection space, A control unit that controls the light emitting unit to emit light to the detection space, and determines that smoke has entered the detection space when the output from the light receiving unit at this time is equal to or greater than a predetermined smoke detection threshold; A temperature detector for detecting the ambient temperature of the light emitting unit, and adjustment information for adjusting the ambient temperature of the light emitting unit, the adjustment information corresponding to individual differences of the light emitting unit being stored An information storage unit, and the control unit corrects the smoke detection threshold from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. Is to provide.

  Smoke detectors are used to detect smoke by detecting smoke, so when actually functioning, they are exposed to the heat of the fire.

  On the other hand, in recent smoke detectors, a light emitting diode is often used as a light emitting portion, and this light emitting diode generally has a property that the amount of emitted light decreases as the temperature increases.

  Therefore, when the smoke detector is used at a high temperature and when it is used at a low temperature, the amount of light emitted from the light emitting diode is smaller and the detection sensitivity becomes dull when the smoke detector is used at a high temperature. The phenomenon that occurs.

  Therefore, in order to avoid such a problem, it is necessary to adjust (calibrate) the detection sensitivity according to the temperature for each smoke detector, but conventionally, no consideration has been given to the temperature.

  That is, the conventional calibration is only performed at a single temperature, and the calibration based on the temperature change has not been performed.

  Therefore, there is a problem in that an error occurs in the sensitivity of detecting smoke as the operating temperature of the smoke detector moves away from the temperature at which calibration is performed.

  Moreover, even if the light emitting diodes are the same product, there are individual differences, and the change in the amount of light when the temperature is changed in a state where constant power is supplied varies depending on the solid.

  Therefore, in addition to the above-described errors, there is a problem that errors due to individual product differences also occur.

  Therefore, in the present invention, the adjustment information for the ambient temperature of the light emitting unit, the adjustment information corresponding to the individual difference of the light emitting unit, the sensitivity error of smoke detection, the error due to individual product individual difference The smoke detection threshold is corrected based on both.

  That is, according to the present invention, the smoke detection threshold can be adjusted based on the ambient temperature of the light emitting unit obtained from the temperature detecting unit and the adjustment information for the ambient temperature, and the ambient temperature of the light emitting unit has changed. Even in this case, the smoke detection sensitivity can be made as constant as possible, and the above-described problems can be avoided.

  The adjustment information is a table or calculation information in which the ambient temperature of the light emitting unit is associated with a smoke detection threshold, and the control unit is configured to control the smoke according to the ambient temperature of the light emitting unit detected by the temperature detection unit. The detection threshold value may be read from the adjustment information storage unit, and the smoke detection threshold value may be set as the predetermined smoke detection threshold value.

  By doing in this way, a smoke detection threshold value can be easily calculated from the ambient temperature of a light emission part, and smoke can be detected with the smoke detection threshold value corresponding to the ambient temperature of a light emission part. That is, the sensitivity of the smoke detector can be adjusted in accordance with the ambient temperature of the light emitting unit.

  In addition, a light emission characteristic detection unit that detects the light emission characteristic of the light emission unit is provided, and the adjustment information storage unit includes a plurality of adjustment information for the ambient temperature of the light emission unit corresponding to the detection result of the light emission characteristic detection unit. The control unit reads the adjustment information corresponding to the detection result of the light emission characteristic detection unit from the adjustment information storage unit, corrects the smoke detection threshold, and emits the adjustment information. Adjustment information corresponding to individual differences of parts may be used.

  In other words, the adjustment information that most closely matches the correspondence between the ambient temperature of the light emitting unit and the smoke detection threshold is selected from among a plurality of adjustment information stored in advance according to individual product differences of the light emitting elements disposed in the light emitting unit. The smoke detection threshold value may be adjusted based on the selected adjustment information.

  This avoids the problem that the smoke detection sensitivity changes because the amount of change in the amount of light emission that varies depending on the ambient temperature of the light emitting unit varies depending on individual product differences of the light emitting elements used in the light emitting unit. it can.

  A light emission characteristic detection unit configured to detect a light emission characteristic of the light emission unit; and the control unit generates the adjustment information according to a detection result of the light emission characteristic detection unit, and the adjustment information is stored in the adjustment information storage unit. You may make it memorize.

  For example, the light emission characteristic detection unit obtains one or a plurality of correspondence data between the temperature around the light emission unit and the light reception signal output from the light reception unit that captures scattered light under a predetermined smoke concentration. Based on this, a table indicating the correspondence between the temperature and the received light signal, a calibration curve (standard curve), calculation information of the calibration curve, and the like may be generated as adjustment information and stored in the adjustment information storage unit.

  Thus, even if the adjustment information storage unit does not store a plurality of adjustment information for the ambient temperature of the light emitting unit corresponding to the detection result of the light emission characteristic detecting unit, the individual difference of the light emitting elements used in the light emitting unit As a result, the amount of change in the amount of light emission that varies depending on the ambient temperature of the light emitting unit is different, so that the problem that the smoke detection sensitivity changes can be avoided.

  When only one point of correspondence data between the temperature and the received light signal is acquired to generate a calibration curve (standard curve) or calculation information of the calibration curve, the light emitting part is averaged regardless of individual product differences. The emission characteristic curve shown may be generated by correcting so as to pass the point of the corresponding data.

  The light emission characteristic detection unit may detect the light emission characteristic of the light emitting unit by detecting the light emission level of each light emitting unit when the power supplied to the light emitting unit is changed by two or more points. .

  This makes it possible to further improve the correction accuracy of individual product differences, and avoids the problem that the smoke detection sensitivity changes because the amount of change in the amount of light emission that changes more accurately according to the ambient temperature of the light emitting unit is different. can do.

  The light emission characteristic detection unit may detect the light emission characteristic of the light emitting unit by detecting the light emission level of each of the light emitting units when the temperature of the light emitting unit is changed by two or more points.

  In this case as well, the correction accuracy of individual product differences can be further improved in the same manner as when the above-mentioned supply power is changed by two or more points, and the amount of change in the light emission amount that changes more accurately according to the ambient temperature of the light emitting unit can be obtained. Since they are different, the problem that the smoke detection sensitivity changes can be avoided.

  In addition, the light emission characteristic detection unit may detect the light emission level of the light emission unit during the test mode of the smoke detector.

  For example, when performing a smoke detection sensitivity test before shipment at the factory when the smoke detector is shipped, the smoke detector is set to the test mode, and the generated adjustment information is stored in the adjustment information storage unit. It is possible to provide a smoke detector in which individual product differences are corrected in a set (default) state.

  The generation of the adjustment information and the storage of the generated adjustment information in the adjustment information storage unit may be performed in the smoke detector, but are performed by an adjustment information writing device provided separately from the smoke detector. The adjustment information may be adjustment information corresponding to individual differences of the light emitting units.

  That is, the smoke detector includes an input unit that inputs information from the adjustment information writing device, and an output unit that outputs an output from the light receiving unit to the adjustment information writing device. When a power setting command is acquired from the adjustment information writing device via the input unit in the smoke detector test mode, light is emitted from the light emitting unit to the detection space, and at this time, output from the light receiving unit The received light signal is output to the adjustment information writing device via the output unit, and the adjustment information generated by the adjustment information writing device based on the output from the light receiving unit is input via the input unit. Then, the input adjustment information may be stored in the adjustment information storage unit.

  By adopting such a configuration, it is possible to provide a smoke detector in which individual differences are corrected in an initial setting state at the time of shipment from the factory, without the individual smoke detector having a calibration function.

  In addition, when the control unit acquires the power setting command, the control unit sequentially emits light from the light emitting unit to the detection space at two or more points with different intensities, or an adjustment generated by the adjustment information writing device. The information is information generated based on the light reception signal output from the light receiving unit when the temperature of the light emitting unit is changed by two or more points, thereby improving the correction accuracy of individual product differences. In addition, since the amount of change in the amount of light emission that changes more accurately depending on the ambient temperature of the light emitting unit is different, the problem that the smoke detection sensitivity changes can be avoided.

  By the way, the smoke detector according to the present invention described above has a problem that the detection sensitivity changes due to the amount of light emitted from the light emitting unit that changes depending on the temperature around the light emitting unit. The problem was solved by adjusting, for example, when the ambient temperature of the light emitting unit was changed by adjusting the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit. Alternatively, it may be a smoke detector capable of making the smoke detection sensitivity as constant as possible.

  That is, a main body case, a light emitting unit that emits light to a detection space in the main body case, a light receiving unit that receives scattered light from the light emitting unit due to smoke that has entered the detection space, and the light emitting unit A smoke detector comprising: a control unit that controls the emission of light into the detection space by detecting the intrusion of smoke into the detection space based on the output from the light receiving unit at this time; A temperature detection unit that detects the ambient temperature of the light emitting unit; and an adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, the adjustment information for the ambient temperature of the light emitting unit, A control part correct | amends the output of the said light emission part from the detection result of the said temperature detection part, and the adjustment information memorize | stored in the said adjustment information storage part.

  In this case, the light emitting unit includes a variable amplifier that amplifies the control signal of the control unit so that power adjustment is possible, and a light emitting element that emits light based on the control signal adjusted in power by the variable amplifier, and the control unit The correction of the output of the light emitting unit may be performed by controlling the variable amplifier from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.

  This adjusts the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit, and the smoke detection sensitivity is kept as constant as possible even when the ambient temperature of the light emitting unit changes. It can be.

  Also, instead of adjusting the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit, the output from the light receiving unit is adjusted according to the temperature measurement result around the light emitting unit. Also good.

  That is, a main body case, a light emitting unit that emits light to a detection space in the main body case, a light receiving unit that receives scattered light from the light emitting unit due to smoke that has entered the detection space, and the light emitting unit A smoke detector comprising: a control unit that controls the emission of light into the detection space by detecting the intrusion of smoke into the detection space based on the output from the light receiving unit at this time; A temperature detection unit that detects the ambient temperature of the light emitting unit; and an adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, the adjustment information for the ambient temperature of the light emitting unit, The control unit corrects the output of the light receiving unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit.

  In this case, the light receiving unit includes a light receiving element and a variable amplifier that amplifies the output of the light receiving element, and the control unit stores the detection result of the temperature detection unit and the adjustment information storage unit. From the adjustment information, the output of the light receiving unit may be corrected by controlling the variable amplifier.

  As a result, the output from the light receiving unit is adjusted according to the temperature measurement result around the light emitting unit, and the smoke detection sensitivity can be made as constant as possible even when the ambient temperature of the light emitting unit changes. it can.

  Hereinafter, the smoke detector according to the present invention will be described in more detail with reference to the drawings. To make the explanation easier to understand, by adjusting the smoke detection threshold according to the temperature measurement result around the light emitting unit, even if the ambient temperature of the light emitting unit has changed, the detection sensitivity of smoke is made possible. A smoke detector that can be kept constant is described in the first embodiment, and the detection sensitivity of smoke is made possible by adjusting the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit. A smoke detector that can be made constant is described in the second embodiment, and the detection sensitivity of smoke is made as constant as possible by adjusting the output from the light receiving unit according to the temperature measurement result around the light emitting unit. A possible smoke detector is described in a third embodiment.

[First Embodiment]
FIG. 1 is an explanatory diagram showing a usage state of the smoke detector S according to the present embodiment. As shown also in FIG. 1, the smoke detector S according to the present embodiment is disposed on a ceiling surface T indoors (in the present embodiment, a living room 1).

  This smoke detector S contributes to quick fire extinguishing by generating a warning sound by detecting smoke 3 drifting indoors, or by interlocking with a fire alarm (not shown). is there.

  Specifically, for example, as shown in FIG. 1, in the event of a fire in the living room 1, smoke 3 is generated from the combusted material 2 together with flames.

  The smoke 3 rises upward due to the heat of combustion, and enters the inside of the smoke detector S disposed on the ceiling surface T.

  An optical smoke sensor is disposed inside the smoke detector S, and the smoke sensor detects the smoke 3 and issues an alarm.

  Next, the configuration of the smoke detector S will be described with reference to FIG.

  FIG. 2 shows a cross-sectional view of the smoke detector S according to the present embodiment. As shown in FIG. 2, the smoke detector S has a substantially convex shape in a sectional view with the tip directed in the floor direction, and an attachment base for fixing the smoke detector S to the ceiling surface T. 4, a smoke detection unit body 5 provided with the smoke sensor A disposed on the mounting base 4, and a detection space forming unit 6 projecting toward the floor so as to cover the smoke sensor A. ing.

  The smoke detection unit body 5 includes a smoke detection unit casing 7, and the detection space forming unit 6 includes a protective cover 8, and the smoke detection unit casing 7 and the protective cover 8 make up the entire smoke detector S. The main body case 9 is protected.

  The mounting base 4 has a substantially U-shaped cross-sectional view that opens in the floor surface direction, and is provided with fixing screw insertion holes 50 for fixing the mounting base 4 (smoke detector S) to the ceiling surface T at a plurality of locations. The smoke detector S can be attached to the ceiling surface T by a fixing screw (not shown).

  Further, a cable insertion hole 51 is formed in a substantially central portion of the mounting base 4, and a power cable (not shown) laid on the back side (ceiling back) of the ceiling surface T is connected via the cable insertion hole 51. It is drawn into the smoke detector S so that power can be supplied to the smoke detector S.

  The cable insertion hole 51 transmits an information signal issued when the smoke detector S detects the smoke 3 to a fire alarm or the like (not shown) connected in advance, or a fire alarm or the like. A communication cable or the like (not shown) for transmitting the information signal emitted from the sensor to the smoke detector S is also inserted.

  Moreover, the edge part 15 of the attachment base part 4 bent in the U-shape can attach the above-mentioned smoke detection part casing 7 to the outer surface.

  The smoke detector body 5 includes a smoke detector board 52 attached to the mounting base 4, a circuit board 53 disposed on the smoke detector board 52, and a smoke sensor A formed on the circuit board 53. It is provided, and its periphery is covered with a smoke detector casing 7.

  The smoke sensor A includes a light emitting unit 20 including a light emitting circuit unit 87 (described later) formed on the circuit board 53, and a light receiving unit 21 including a light receiving circuit unit 88 (described later).

  The light emitting unit 20 functions as a light source for obtaining scattered light by smoke 3 that has entered a detection space 70 described later, and includes a light emitting circuit unit 87 including a light emitting diode 55 as a light emitting element, and an optical path forming described later. The light emitting portion opening 57 of the plate 54 is used.

  In the light emitting unit 20, the light emitted from the light emitting diode 55 is emitted obliquely downward with respect to the horizontal direction as indicated by the light emitting axis 61 in FIG.

  In the present embodiment, the light-emitting diode 55 is used as the light-emitting element of the light-emitting unit 20. However, the light-emitting diode 55 is not particularly limited as long as it can emit a relatively stable light amount for a long time.

  The light-emitting diode 55 used as the light-emitting element is, for example, an infrared light-emitting diode, so that it is possible to capture white smoke-based smoke that frequently occurs in a fire in a general household with high sensitivity. In this specification, “light” is a concept including infrared rays and ultraviolet rays in addition to visible rays.

  On the other hand, the light-receiving unit 21 includes a light-receiving circuit unit 88 including a photodiode 56 as a light-receiving element that detects scattered light scattered by smoke 3 entering a detection space 70 described later, and a light-receiving unit of an optical path forming plate 54 described later. It consists of an opening 58.

  The light receiving direction of the light receiving unit 21 is configured to intersect the irradiation direction of the light emitting unit 20 as indicated by the light receiving axis 62 in FIG.

  In the present embodiment, the photodiode 56 is used as the light receiving element of the light receiving unit 21, but it is not particularly limited as long as the scattered light generated by the light emitted from the light emitting unit 20 can be detected. For example, a phototransistor or photodarlington may be used.

  The optical path forming plate 54 is disposed on the circuit board 53 so as to cover the light emitting diode 55 and the photodiode 56. The light path forming plate 54 emits light from the light emitting diode 55 and the light incident on the photodiode 56. This is to regulate the incident direction.

  Specifically, the optical path forming plate 54 includes a light emitting portion opening 57 that restricts the light emission direction from the light emitting diode 55, and a light receiving portion opening 58 that restricts the incident direction of the light incident on the photodiode 56. Yes.

  The light emitting portion opening 57 is formed by making a hole in a diagonally downward direction from the radiation surface 59 of the light emitting diode 55 with respect to the horizontal direction, and the light emitted from the light emitting diode 55 is horizontal through the light emitting portion opening 57. It will be radiated in the diagonally downward direction with respect to the direction.

  The light receiving portion opening 58 is formed by forming a hole in a diagonally downward direction with respect to the horizontal direction from the light receiving surface 60 of the photodiode 56, and scattered light scattered by the smoke 3 in the detection space 70. Of these, only the light directed to the light receiving portion opening 58 is guided to the photodiode 56.

  Then, the light emitting axis 61 indicating the irradiation direction of the light emitting portion opening 57 and the light receiving axis 62 indicating the light receiving direction of the light receiving portion opening 58 intersect each other, and when there is no smoke 3 in the detection space 70, While the light emitted from the light emitting diode 55 is prevented from directly entering the photodiode 56, when there is smoke 3 in the detection space 70, the scattered light scattered by the smoke 3 can enter the photodiode 56. It is trying to become.

  The detection space forming portion 6 includes a cap portion 30 having a detection space 70 and a speaker 63, and both are formed by covering with a protective cover 8.

  As shown in FIGS. 2 and 3A, the cap portion 30 includes a substantially disc-shaped cap base portion 64 having a conical mountain-shaped portion 65 at the center portion, and a peripheral wall constituting body 10 spaced from the cap base portion 64 at a predetermined interval. However, a labyrinth wall B formed in an annular shape is provided, and the inside of the labyrinth wall B is used as a detection space 70.

  In other words, the labyrinth wall B forms the side periphery of the cap portion 30, that is, the outer peripheral wall of the peripheral wall constituting body 10.

  And the cap part 30 is attached so that the smoke sensor A may be covered. Specifically, the cap portion 30 is disposed so that the light emitting portion opening 57 and the light receiving portion opening 58 of the smoke sensor A are exposed to the detection space 70.

  Note that a mesh-like insect net 16 is disposed on the outer circumferential surface of the cap portion 30 to prevent insects and dust from entering the cap.

  The speaker 63 is disposed on the back surface 66 side of the cap portion 30 by the protective cover 8.

  The speaker 63 is connected to the circuit board 53 by wiring (not shown), and when smoke 3 is detected by the smoke sensor A or when an information signal emitted from a fire alarm or the like connected in advance is received. A warning sound or a sound for notifying that smoke has been detected is output.

  The protective cover 8 constitutes the main body case 9 together with the smoke detecting portion casing 7 described above, and also constitutes the detection space forming portion 6 by integrating the cap portion 30 and the speaker 63 together.

  In addition, the protective cover 8 is intermittently cut away in the circumferential direction at a position opposite to the side periphery of the cap portion 30 (the outer peripheral wall of the peripheral wall constituting body 10) to form a smoke inlet 67. The smoke 3 around the vessel S can be guided into the detection space 70 through the labyrinth wall B through the smoke inlet 67.

  Next, the configuration of the cap unit 30 will be described in more detail with reference to FIG. FIG. 3A shows a plan view of the cap portion 30, and FIG. 3B is an explanatory diagram in which a part of the labyrinth wall B is enlarged in plan view.

  As shown in FIG. 3A, the cap portion 30 has an annular peripheral wall within the above-described cap base portion 64 and an imaginary predetermined circumference C defined along the cap base end edge 68 of the cap base portion 64. It is comprised with the labyrinth wall B comprised by arranging the structure 10 side by side.

  The cap base 64 includes a flat portion 69 formed in a donut shape along the cap base edge 68, and a substantially central portion of the cap base 64, that is, a cone-shaped portion 65 formed inside the flat portion 69. Yes.

  The conical mountain portion 65 is formed by projecting the bottom surface in a conical shape toward the detection space 70, and functions to suppress diffusion of light emitted from the light emitting diode 55.

  In FIG. 3A, reference numeral 72 denotes a locking convex portion for fixing the cap portion 30 to the optical path forming plate 54.

  On the other hand, the labyrinth wall B is configured by arranging the peripheral wall constituting body 10 in parallel on a flat portion 69 flat in the horizontal direction.

  As shown in FIG. 3B, the peripheral wall constituting body 10 is composed of a first shielding wall constituting piece 11 and a second shielding wall constituting piece 12 connected to the first shielding wall constituting piece 11. Yes.

  A plurality of the peripheral wall constituting bodies 10 are arranged in parallel at predetermined positions and angles described below, and the labyrinth wall B is configured to efficiently guide the smoke 3 into the labyrinth wall B or the detection space 70. At the same time, it plays a role of preventing as much as possible light outside the smoke detector S (hereinafter simply referred to as “external light”) from entering the detection space 70.

  The first shielding wall constituting piece 11 is a member disposed in the vicinity of the predetermined circumference C and having a substantially square shape (substantially reverse square shape) in plan view.

  The first shielding wall constituting piece 11 includes two peripheral wall pieces 11a arranged along a predetermined circumference C as one side and an inward guide piece 11b arranged toward the inside of the predetermined circumference C as another side. It is comprised by the side, and the site | part vicinity bent to the outward of the predetermined circumference C by the connection part of the surrounding wall piece 11a and the inward guide piece 11b is used as the top part 71 of the 1st shielding wall component piece 11 Yes.

  The peripheral wall piece 11a has a role of causing the smoke around the cap portion 30 to flow along a predetermined circumference C, and the smoke 3 guided into the labyrinth wall B by the inner guide piece 11b described later returns to the outside again. It is arranged so as to be substantially parallel to a tangent line on a predetermined circumference C in the vicinity of the peripheral wall piece 11a and the apex 71.

  The inward guide piece 11b has a role of inducing smoke flowing on the outer periphery of the labyrinth wall B along the peripheral wall piece 11a (predetermined circumference C) to the inside of the labyrinth wall B.

  The inward guide piece 11b is disposed so as to be inclined inward of a predetermined circumference C by an angle i with respect to the virtual extension line n of the aforementioned peripheral wall piece 11a.

  The angle i can be set as appropriate according to the use environment and design of the smoke detector S, but can be set to, for example, 40 to 50 degrees, preferably 43 to 47 degrees.

  By setting the angle i to 40 to 50 degrees, preferably an angle in the vicinity of 45 degrees (for example, 43 to 47 degrees), the smoke 3 can be efficiently guided into the labyrinth wall B, and the outside light is Intrusion into the detection space 70 can be prevented as much as possible. In particular, by setting the angle within a range of 43 to 47 degrees, the allowable range of design accuracy can be expanded, and manufacturing can be facilitated.

  The second shielding wall constituting piece 12 is a member having a substantially letter-like shape in cross-sectional view extending from the inside (recessed angle side) of the top portion 71 of the first shielding wall constituting piece 11.

  Specifically, the second shielding wall constituting piece 12 has the same length as the long side forming piece 12b extending inward of the predetermined circumference C with the top 71 inferior angle side of the first shielding wall constituting piece 11 as the base end. The side forming piece 12b is formed of a folded portion 12a formed by bending the tip portion of the side forming piece 12b at an acute angle at an angle p toward the peripheral wall piece 11a.

  The long side forming piece 12b is extended from the top 71 inferior angle side of the first shielding wall constituting piece 11 so as to have an angle k with respect to the peripheral wall piece 11a and an angle j with respect to the inward guide piece 11b.

  Here, the angle k is 40 to 50 degrees, preferably 43 to 47 degrees, and the angle j is 85 to 95 degrees, preferably 88 to 92 degrees.

  The angle k is 40 to 50 degrees, preferably an angle in the vicinity of 45 degrees (for example, 43 to 47 degrees), and the angle j is 85 to 95 degrees, preferably an angle in the vicinity of 90 degrees (for example, 88 to 92 degrees). As a result, the smoke 3 can be efficiently guided into the labyrinth wall B, and the outside light can be prevented from entering the detection space 70 as much as possible. In particular, when the angle k is in the range of 43 to 47 degrees and the angle j is in the range of 88 to 92 degrees, the allowable range of design accuracy can be expanded, and manufacturing can be facilitated.

  The folded portion 12a bends a bent smoke guide path 40, which will be described later, to the outside of a predetermined circumference C to prevent outside light from entering the detection space 70, and smoke 3 that has reached the folded portion 12a. Is sent toward the inner side surface (the surface forming the angle j) of the inner guide piece 11b of the other peripheral wall constituting body 10 arranged side by side.

  The angle p formed by the folded portion 12a and the long side forming piece 12b is 65 to 75 degrees, preferably 68 to 72 degrees.

  By setting the angle p to 65 to 75 degrees, preferably an angle in the vicinity of 70 degrees (for example, 68 to 72 degrees), to the inner surface of the inner guide piece 11b of the other peripheral wall constituting body 10 in which the smoke 3 is juxtaposed It is possible to feed out smoothly and to prevent the narrow portion from being formed in the bent smoke guide path 40 as much as possible. In particular, by setting it within the range of 68 to 72 degrees, the allowable range of design accuracy can be widened, and manufacturing can be facilitated.

  Further, a cutout portion 14 is formed at the tip of the folded portion 12a. The cutout portion 14 is cut out in parallel to the long side forming piece 12b of the adjacent peripheral wall constituting body 10.

  By forming the notch portion 14 in this way, the smoke 3 sent out by the folded portion 12a to the inner side surface of the inward guide piece 11b of the other peripheral wall constituting body 10 arranged side by side along the long side forming piece 12b. When entering the detection space 70, it is possible to prevent the flow from being obstructed again by the folded portion 12a.

  Although the peripheral wall structure 10 has the above-described structure described with reference to FIGS. 3A and 3B, it goes without saying that the peripheral wall structure 10 may have a shape of a palm object. Yes.

  The labyrinth wall B is formed by arranging a plurality of such peripheral wall constituting bodies 10 in a plurality of predetermined circumferences C in an annular shape.

  As shown in FIG. 3B, the arrangement layout of each peripheral wall constituting body 10 is such that the inner guide pieces 11b are arranged in the longitudinal direction of the long side forming pieces 12b of the other peripheral wall constituting bodies 10 arranged side by side (for example, , In the vicinity of the intermediate point m), and the folded portion 12a is arranged to face the corner having the angle j.

  Further, as shown in FIG. 3A, a smoke inlet 13 is formed between the first shielding wall constituting pieces 11 arranged side by side, and the inside of the cap portion 30 is formed between the adjacent first shielding wall constituting pieces 11. In the meantime, the bent smoke guide path 40 is formed so that the smoke 3 on the outer periphery of the cap portion 30 can flow into the detection space 70.

  Note that the lengths of the peripheral wall piece 11a, the inner guide piece 11b, and the folded portion 12a are such that when the smoke detector S is irradiated with light, external light is directly directed from the smoke inlet 13 toward the detection space 70. The length is such that it does not invade and that prevents the smooth flow of the smoke 3 as much as possible.

  By disposing each peripheral wall constituting body 10 in this way, it is possible to prevent the intrusion of light from the outside as much as possible and to allow smoke to enter more efficiently.

  Next, the electrical configuration of the smoke detector S according to the present embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing an electrical configuration of the smoke detector S according to the present embodiment.

  The smoke detector S according to this embodiment includes a microcomputer 80 on the circuit board 53 described above, and functions as a control unit for controlling the entire smoke detector S.

  The microcomputer 80 includes a CPU 90, a ROM 91, a nonvolatile memory 92, a RAM 86, and an A / D converter 93. The ROM 91, the nonvolatile memory 92, the RAM 86, and the A / D converter 93 are connected to the CPU 90, respectively. Has been.

  The ROM 91 stores a program for executing a flow described later by the CPU 90 and controlling the operation of the smoke detector S.

  The nonvolatile memory 92 stores a smoke detection threshold table (see FIG. 5A) as adjustment information that is referred to when determining whether smoke is detected. The memory 92 functions as an adjustment information storage unit.

  Specifically, the CPU 90 calculates the smoke detection threshold by comparing the temperature data from the temperature sensor with the smoke detection threshold table stored in the nonvolatile memory 92 (adjustment information storage unit), A light reception signal from a light receiving circuit unit 88 described later is compared with the calculated smoke detection threshold value to determine whether smoke is detected. The smoke detection threshold value table will be described in detail later.

  The RAM 86 has a function of storing various flags and variable values as a temporary storage area of the CPU 90. As an example of the flag to be stored, for example, a value of “1” is taken when it is determined that smoke has been detected, and a value of “0” is taken in other cases (when it is not determined that smoke has been detected). There is a smoke detection flag.

  The A / D converter 93 converts a light reception signal having an analog voltage value transmitted by a light reception circuit unit 88, which will be described later, into a light reception signal having a digital voltage value that can be processed by the CPU 90.

  The microcomputer 80 includes a light emitting circuit unit 87 for emitting light toward the detection space 70 and a light receiving circuit unit 88 for receiving scattered light generated by the smoke 3 in the detection space 70. A temperature sensor 81 for measuring temperature, a reset button 82 for restarting the microcomputer 80, a test mode switch 99, and a speaker 63 are connected.

  The light emitting circuit unit 87 constitutes the light emitting unit 20 described above, and includes a variable amplifier 84 and a light emitting diode 55 as a light emitting element. The light emitting diode 55 is connected to the microcomputer 80 via the variable amplifier 84. ing.

  The variable amplifier 84 can adjust the power output to the light emitting diode 55 under the control of the microcomputer 80, and the light emission amount of the light emitting diode 55 can be changed according to the power output from the variable amplifier 84. Yes.

  The light receiving circuit unit 88 constitutes the light receiving unit 21 described above, and includes a photodiode 56 as a light receiving element and an IV amplifier 85. The photodiode 56 is connected to the microcomputer 80 via the IV amplifier 85. Connected to.

  The IV amplifier 85 also has a function of converting a light reception signal based on a current obtained by light incident on the photodiode 56 into a light reception signal based on a voltage, and amplifying the signal intensity. Further, although not particularly limited, in the present embodiment, a voltage proportional to the amount of light incident on the photodiode 56 is output.

  The temperature sensor 81 is disposed in the vicinity of the light emitting diode 55 of the light receiving circuit unit 88, and the microcomputer 80 measures the temperature around the light emitting diode 55 based on the temperature data transmitted from the temperature sensor 81. Can do. The temperature sensor 81 functions as a temperature detection unit.

  The reset button 82 is disposed in a place where the user can press the smoke detector S on the ceiling surface T (for example, a side surface portion of the smoke detector S). By pressing the button, it is possible to interrupt a flow that is being executed, which will be described later, and return the values of flags and variables used during processing to their initial values.

  The test mode switch 99 is a switch for setting the smoke detector S to a test mode (described later). By turning ON the test mode switch 99, the variable amplifier 84 of the light emitting circuit unit 87 is set to output predetermined power for testing based on a command from the adjustment information writing device 94 described later, and is nonvolatile The memory 90 is allowed to be written to by the CPU 90.

  The speaker 63 outputs an alarm sound or a warning sound under the control of the microcomputer 80.

  Further, as a characteristic configuration of the smoke detector S according to the present embodiment, which will be described in detail later using a flow, it has a function of correcting a change in smoke detection sensitivity derived from the use environment temperature.

  Specifically, it is known that the light emitting diode 55 has a different light emission amount depending on the temperature of the use environment. Generally, the light emission amount decreases as the temperature increases.

  Therefore, if the threshold for determining that “smoke has been detected” (smoke detection threshold) is a constant value regardless of the temperature around the light emitting unit 20, the operating environment temperature of the smoke detector S is high. Since the amount of light emitted from the light emitting diode 55 is different between the case and the case where the case is low, a difference occurs in the sensitivity of detecting smoke.

  In other words, in the case of the general light-emitting diode 55, the amount of light emission decreases as the temperature increases. Therefore, when the smoke detector S is used at a high temperature and when it is used at a low temperature, When it is used, the amount of light emitted from the light emitting diode 55 is small, and the detection sensitivity becomes dull.

  In order to avoid such a phenomenon, the smoke detector S according to the present embodiment has a boundary for determining whether or not smoke is detected according to the ambient temperature of the light emitting unit 20 (light emitting circuit unit 87). The smoke detection threshold is adjusted.

  In particular, in the present embodiment, the CPU 90 collates the smoke detection threshold value table stored in the nonvolatile memory 92 with the temperature calculated based on the temperature data obtained from the temperature sensor 81, thereby determining the smoke detection threshold value. adjust.

  Specifically, as shown in FIG. 5A, the smoke detection threshold value table is composed of a plurality of numerical values having a temperature and a predetermined voltage value of the light reception signal as smoke detection threshold values.

According to the table of FIG. 5A, the smoke detection threshold when the temperature is 20 ° C. is Z _th [V], and the smoke detection threshold when the temperature is 0 ° C. is 1.07 × Z _th [V], 30 ° C. In this case, the smoke detection threshold is 0.98 × Z _th [V].

For example, when the ambient temperature of the light emitting unit 20 is 30 ° C. and the voltage value of the light receiving signal output from the light receiving circuit unit 88 exceeds 0.98 × Z _th [V], the CPU 90 issues an alarm as detecting smoke. Alert.

Further, for example, when the ambient temperature of the light emitting unit 20 is 10 ° C., the smoke detection threshold is 1.04 × Z _th [V], so when the voltage value of the light receiving signal output from the light receiving circuit unit 88 is 30 ° C. even Z _th exceeding 0.98 × Z _th is a smoke detection threshold [V] [V], CPU 90 becomes possible to perform the processing as not to detect the smoke.

  In the smoke detection threshold table shown here, the temperature is set in increments of 10 ° C., but is not particularly limited to this, and can be set as appropriate according to the environment in which the smoke detector S is used.

  In addition, as shown in FIG. 5B, this smoke detection threshold table is a predetermined smoke appropriately selected from a plurality of different smoke detection threshold table groups (hereinafter referred to as adjustment information database 97). It may be a detection threshold table.

  This adjustment information database 97 can be used to correct smoke detection sensitivity due to individual differences in light emitting elements.

  More specifically, it is generally known that there are individual differences among individual products even with light emitting diodes of the same manufacturer and the same model number, and changes in the amount of light emission depending on temperature are also different. .

  Therefore, if there are two smoke detectors using the same model LED 55 and placed in the same temperature environment, the same smoke detection threshold table is used and the same concentration of smoke 3 is delivered to the detection space 70. Even in such a case, there is a possibility that a smoke sensor that determines that the smoke 3 has been detected and a smoke sensor that does not determine that the smoke 3 has been detected may appear.

  Therefore, in order to avoid such a phenomenon, in the smoke detector S according to the present embodiment, the adjustment information database 97 including a plurality of smoke detection threshold value tables having various patterns with different smoke detection threshold values corresponding to the respective temperatures in advance. Is constructed, and a smoke detection threshold value table most similar to the light emission characteristics of the light emitting diodes 55 of the individual smoke detectors S is selected from the database and stored in the nonvolatile memory 92.

  The operation of selecting the predetermined smoke detection threshold value table from the adjustment information database is performed at the time of manufacturing the smoke detector S or at the time of the smoke detection sensitivity test before shipment, and the smoke detection threshold value already selected after shipment. The smoke detection threshold value may be adjusted by reading the table from the nonvolatile memory 92 (adjustment information storage unit).

  Here, for the sake of convenience, assuming that FIG. 4 is a smoke detection sensitivity test prior to shipment of the smoke detector S, in this embodiment, as a light emission characteristic detection unit separately from the smoke detector S, FIG. A functioning adjustment information writing device 94 is provided, and the adjustment information writing device 94 generates a smoke detection threshold table that most closely approximates the individual product difference of the light-emitting diode 55 provided in the smoke detector S. To remember.

  Here, reference numeral 103 denotes a terminal portion provided between the light receiving circuit section 88 and the microcomputer 80, and reference numeral 100 denotes a terminal section provided between the temperature sensor 81 and the microcomputer 80. 1 is a test lead for extending the adjustment information writing device 94 and bringing it into contact with the terminal portion 103 to obtain a received light signal, and the one-dot chain line denoted by reference numeral 101 is the adjustment information writing device 94. This is a test lead for acquiring temperature data by extending from the terminal part 100 and contacting the terminal unit 100. A one-dot chain line indicated by reference numeral 96 detects smoke from the adjustment information writing device 94 to the nonvolatile memory 92 via the CPU 90. It is a data communication cable for writing a threshold table (adjustment information).

  The adjustment information writing device 94 includes a light reception signal measuring device 98 that measures the voltage value of the light reception signal, the adjustment information database 97, and the microcomputer 102 that controls the entire adjustment information writing device 94. The received light signal measuring device 98 and the adjustment information database 97 are connected to the microcomputer 102, respectively.

  Further, the microcomputer 102 of the adjustment information writing device 94 executes a program for processing a flow which will be described later with reference to FIG.

  In the smoke detection sensitivity test, the smoke detector S is placed at a predetermined temperature to supply smoke 3 having a predetermined concentration into the detection space 70, and the test mode switch 99 is turned on to operate the smoke detector S. Is set to the test mode, and the light receiving signal output from the light receiving circuit unit 88 is taken into the adjustment information writing device 94 via the test lead 95. Further, the temperature data output from the temperature sensor 81 is taken into the adjustment information writing device 94 via the test lead 101.

  In the adjustment information writing device 94, the voltage value of the received light signal output from the light receiving circuit unit 88 by the received light signal measuring device 98 and the temperature based on the temperature data output from the temperature sensor 81 are measured, and the adjustment information database 97 As shown in FIG. 5B, a smoke detection threshold value table having a value closest to the voltage value of the received light signal at the predetermined temperature is selected and stored in the nonvolatile memory 92 via the data communication cable 96. Write as a predetermined smoke detection threshold table.

  In this way, the difference in smoke detection threshold due to individual product differences is adjusted.

  After shipment, the adjustment information writing device 94, the test lead 95, the test lead 101, and the data communication cable 96 are removed from the smoke detector S. Further, the test mode switch 99 is returned to the OFF state.

  In the present embodiment, predetermined power is supplied only once to the light emitting circuit unit 87 (light emitting unit 20), and a predetermined smoke detection threshold table is selected from the adjustment information database 97 based on the obtained light reception signal and temperature information. However, the power supplied to the light emitting circuit unit 87 (light emitting unit 20) is changed by two or more points, and the light emission level of each light emitting unit 20 (light emitting diode 55 of the light emitting circuit unit 87) is detected to emit light characteristics. And a predetermined smoke detection threshold value table may be selected from the adjustment information database 97.

  Further, the temperature environment in the test mode is changed by two or more points, the light emission characteristics are detected by detecting the light emission level of the light emitting unit 20 (the light emitting diode 55 of the light emitting circuit unit 87) at each temperature, and the adjustment information database 97 Alternatively, a predetermined smoke detection threshold value table may be selected.

  By increasing the number of samplings, it is possible to select a smoke detection threshold value table (adjustment information) suitable for correcting sensitivity differences due to individual product differences.

  In the present embodiment, the adjustment information is a smoke detection threshold table in which the correspondence between the temperature and the threshold is discrete. However, the adjustment information is not particularly limited to this, and for example, the correspondence between the temperature and the threshold is continuous. The calculation information may be used. In other words, the correlation equation between the temperature and the threshold value may be stored as adjustment information in the nonvolatile memory 92 as the adjustment information storage unit.

  Specifically, as an alternative to the smoke detection threshold value table shown in FIG. 5A, an equation as shown in FIG. At this time, the plurality of pieces of adjustment information to be stored in the adjustment information database 97 are changed to smoke detection threshold value table groups having different threshold values corresponding to the respective temperatures as shown in FIG. The calculation information group in which the coefficient and the intercept shown in FIG. Of course, only the coefficient or the intercept may be changed. This calculation information group can also be used as an adjustment information database. Note that when the calculation information constituting the calculation information group is, for example, a correlation equation, the order of the correlation equation can be set as appropriate.

  Further, the adjustment information may be generated according to the detection result (measurement result) of the adjustment information writing device 94 and written to the nonvolatile memory 92.

  For example, by changing the temperature environment in the test mode by two or more points, depending on the detection result (measurement result) of the adjustment information writing device 94 at each temperature, the smoke detection threshold table and the correlation equation between the temperature and the threshold You may make it produce | generate.

  The correlation equation may be an approximate equation. For example, a linear curve can be generated by the least square method or the like.

  Next, the process of the smoke detector S according to the present embodiment will be described with reference to FIGS. 6 is a flow showing a main process of the smoke detector S according to the present embodiment, FIG. 7 is a flow showing a test mode process, FIG. 8 is a flow showing a light emission process, FIG. 9 is a flowchart showing received light signal analysis processing.

  First, the main flow will be described with reference to FIG. The CPU 90 of the microcomputer 80 functioning as a control unit first executes initial setting processing such as RAM access permission and work area initialization (step S10). At this time, a smoke detection flag is set in the RAM 86, and the value of the smoke detection flag is set to “0: not detected”.

  Next, the CPU 90 executes a test mode process (step S11). In this test mode process, it is determined whether or not the test mode switch 99 is ON. If it is ON, the light emission characteristic of the light emitting diode 55 is detected according to the ambient temperature of the light emitting unit 20. The CPU 90 functions as a light emission characteristic detector by executing this test mode process. This test mode process will be described later with reference to FIG.

  Next, the CPU 90 executes a light emission process for emitting light from the light emitting unit 20 toward the detection space 70 (step S12). This light emission process will be described later with reference to FIG.

  Next, the CPU 90 executes a received light signal analysis process for analyzing the received light signal output from the light receiving unit 21 (light receiving circuit unit 88) (step S13).

  In this received light signal analysis process, it is determined whether or not the received light signal sent from the light receiving circuit unit 88 to the microcomputer 80 exceeds the smoke detection threshold value. This received light signal analysis process will be described later in detail with reference to FIG.

  Next, the CPU 90 determines whether or not the reset button 82 has been pressed (step S14).

  If the CPU 90 determines that the reset button 82 has been pressed (step S14: Yes), the process proceeds to step S10, and initialization is performed again.

  On the other hand, if the CPU 90 determines that the reset button 82 has not been pressed (step S14: No), the process proceeds to step S15.

  In step S15, the CPU 90 refers to the RAM 86 and determines whether or not the smoke detection flag is “1: smoke detection”.

  If it is determined that the smoke detection flag is not “1: smoke detection” (step S15: No), the process proceeds to step S11 and the test mode process is executed.

  If it is determined that the smoke detection flag is “1: smoke detection” (step S15: Yes), the process proceeds to step S16 assuming that smoke is detected.

  In step S16, an alarm issuing process for notifying that smoke has been detected is performed. In this alarm issuing process, for example, an alarm sound or a voice is output from the speaker 63 built in the smoke detector S.

  Next, in step S17, the microcomputer 80 determines whether or not it has been reset.

  If it is determined in step S17 that it has not been reset (step S17: No), the process of step S17 is performed again. That is, the alarm is maintained until it is reset.

  On the other hand, if it is determined in step S17 that the reset has been made (step S17: Yes), the process proceeds to step S10 to perform initial setting.

  The “reset” determined in step S17 is not only determined as to whether or not the reset button 82 has been pressed, but also whether or not a reset signal has been received remotely by a fire alarm system (not shown). You may make it judge about.

  Next, the test mode process performed in step S11 will be described in detail with reference to FIG. The processing in the adjustment information writing device 94 related to the test mode processing will be described later with reference to FIG.

  In the test mode process, first, the CPU 90 determines whether or not the test mode switch 99 connected to the microcomputer 80 is ON (step S21).

  Here, when the CPU 90 refers to the test mode switch 99 and determines that the test mode switch is ON (step S21: Yes), the process proceeds to step S22. Here, when the CPU 90 moves the process to step S22, the smoke detector S enters the test mode.

  On the other hand, when the CPU 90 determines that the test mode switch is not ON (step S21: No), the CPU 90 returns to the address before branching and continues the processing.

  In step S22, it is determined whether or not a power setting command from the adjustment information writing device 94 has been received.

  The power setting command transmitted from the adjustment information writing device 94 is a command for setting the power value output from the variable amplifier 84 of the light emitting circuit unit 87 to a predetermined value.

  If the CPU 90 determines that a power setting command has been received (step S22: Yes), the process proceeds to step S23.

  On the other hand, if the CPU 90 determines that the power setting command has not been received (step S22: No), the process proceeds to step S21.

  In step S23, the CPU 90 deletes the adjustment information in the nonvolatile memory 92.

  Next, the CPU 90 sets the variable amplifier 84 of the light emitting circuit unit 87 based on the power setting command from the adjustment information writing device 94 so that predetermined power can be output (step S24), and the light emitting unit 20 (light emission). The light emitting diode 55) of the circuit unit 87 is turned on (step S25).

  Next, the CPU 90 determines whether or not a write end signal has been received from the adjustment information writing device 94 (step S26).

  The write end signal transmitted from the adjustment information writing device 94 is received by the adjustment information writing device 94 through the test lead 95 and the test lead 101 to obtain a light reception signal and temperature data. This is a signal for informing the CPU 90 that predetermined adjustment information is selected from the adjustment information database 97 based on the temperature data, and that the selected adjustment information is written to the nonvolatile memory 92.

  If the CPU 90 determines that the write end signal has been received (step S26: Yes), the light emitting diode 55 of the light emitting circuit unit 87 is turned off (step S27), and the process proceeds to the above-described step S21. .

  On the other hand, if the CPU 90 determines that the write end signal has not been received (step S26: No), the process proceeds to step S28.

  In step S28, the CPU 90 determines whether or not a power setting command has been received again.

  If the CPU 90 determines that the power setting command has not been received (step S28: No), the process proceeds to step S25 described above.

  On the other hand, if the CPU 90 determines that the power setting command has been received (step S28: Yes), the process proceeds to step S24 described above.

  Next, the light emission process performed in step S12 will be described in detail with reference to FIG.

  In the light emission process, first, the CPU 90 sets the set value of power output from the variable amplifier 84 of the light emitting circuit unit 87 to a value at which a predetermined power value can be output (step S30).

  Next, the microcomputer 80 turns on the light emitting diode 55 of the light emitting circuit unit 87 (step S31), and returns the processing to the address before branching.

  Next, the received light signal analysis process performed in step S13 will be described with reference to FIG.

  In the received light signal analysis process, first, the CPU 90 stores the received light signal obtained from the light receiving circuit unit 88 in the RAM 86 for a predetermined time (for example, 0.1 second) (step S40).

  Next, the CPU 90 calculates the average value of the light reception signal voltage based on the light reception signal for a predetermined time stored in the RAM 86 (step S41).

  Further, the CPU 90 obtains temperature data from the temperature sensor 81 and performs a temperature measurement process for measuring the temperature around the light emitting unit 20 (step S42).

  Then, the CPU 90 refers to the smoke detection threshold value table stored in the nonvolatile memory 92, and acquires the smoke detection threshold value at the measured temperature (step S43).

  Subsequently, the CPU 90 compares the smoke detection threshold acquired in step S43 with the average value of the voltage calculated in step S41, and determines whether or not the average value of the light reception signal voltage is larger than the smoke detection threshold. (Step S44).

  Here, when it is determined that the average value of the voltage is larger than the smoke detection threshold (step S44: Yes), a flag “1: smoke detection” is set in the smoke detection flag (step S45), and before branching. Return to address.

  On the other hand, when it is determined that the average value of the voltage of the light reception signal is not larger than the smoke detection threshold (step S44: No), the process proceeds to step S46.

  In step S46, the CPU 90 refers to a timer (not shown) built in the microcomputer 80 and determines whether or not a predetermined light emission time (for example, 1 second) has ended.

  If the CPU 90 determines that the predetermined light emission time has not ended (step S46: No), the process proceeds to step S40.

  On the other hand, if the CPU determines that the light emission time has ended (step S46: Yes), the light emitting diode 55 of the light emitting circuit unit 87 is turned off (step S47), and the address before branching is restored.

  Next, the process in the adjustment information writing apparatus related to the test mode process in step S11 will be described with reference to FIG.

  As shown in the block diagram of FIG. 4, the adjustment information stored in the nonvolatile memory 92 (adjustment information storage unit) of the smoke detector S according to the present embodiment is the adjustment information writing device as the light emission characteristic detection unit. It is supposed to be written by 94.

  Therefore, here, the adjustment information writing process in the adjustment information writing device 94 will be described.

  In the adjustment information writing device process, first, the power value output from the variable amplifier 84 of the light emitting unit 20 (light emitting circuit unit 87), the temperature information, and the number of times of measurement of the received light signal are set (step S50).

  Here, the setting of the number of times of measurement is arbitrary, and may be one time or may be two times or more. For example, the number of times of measurement corresponds to the number of measurement points on the calibration curve (standard curve).

  Further, the power value output by the variable amplifier 84, that is, the light emission amount of the light emitting diode 55 may be different for each measurement, and multiple measurements may be performed with the same power value (light emission amount). good.

  The power value and the number of measurements are set by a value input by the user of the adjustment information writing device 94 via an input device (not shown) such as a keyboard.

  Next, the microcomputer 102 of the adjustment information writing device 94 transmits a power setting command to the CPU 90 of the smoke detector S together with the previously set power value (step S51).

  Even when the number of measurements is set to two or more, only the power value for one time is transmitted here.

  Next, the microcomputer 102 determines whether or not the light reception signal and the temperature data are acquired from the smoke detector S (step S52).

  That is, after the data communication cable 96 is properly connected to the microcomputer 80 and the power setting command is transmitted to the smoke detector S, the light receiving signal is received from the terminal portion 103 via the test lead 95, and the terminal portion It is determined whether temperature data is received from 100 via the test lead 101.

  If the microcomputer 102 determines that the light reception signal and the temperature data have not been received (step S52: No), the process proceeds to step S53.

  In step S53, the microcomputer 102 determines whether or not a predetermined time has elapsed since the transmission of the power setting command. If the microcomputer 102 determines that the predetermined time has not elapsed (step S53: No), the process steps again. Move to S52. If the microcomputer 102 determines that the predetermined time has elapsed (step S53: Yes), the process is terminated as a timeout.

  Conversely, if the microcomputer 102 determines in step S52 that the light reception signal and the temperature data have been received (step S52: Yes), the process proceeds to step S54.

  In step S54, the microcomputer 102 calculates the temperature around the light emitting unit 20 based on the acquired temperature data.

  Next, the microcomputer 102 causes the received light signal measuring device 98 to calculate an average received light voltage value per predetermined time based on the obtained received light signal, acquires the average received light voltage value (step S55), and calculates the temperature and average received light voltage. The value is stored in a temporary storage area in the microcomputer 102 (step S56).

  Next, the microcomputer 102 determines whether or not the number of measurements has reached the number of measurements set in step S50 (step S57).

  When the microcomputer 102 determines that the set number of measurements has not been reached (step S57: No), the process proceeds to step S51.

  In the next process of step S51, the second and subsequent power setting values set in advance in step S50 are transmitted to the smoke detector S together with the power setting command.

  On the other hand, if it is determined in step S57 that the number of measurements set by the microcomputer 102 has been reached (step S57: Yes), the microcomputer 102 refers to the adjustment information database 97 and obtains the obtained temperature, average received light voltage, and The adjustment information having the same relationship or the most approximate relationship is determined (step S58).

  The microcomputer 102 writes the determined adjustment information in the nonvolatile memory 92 (adjustment information storage unit) of the smoke detector S (step S59), and transmits a write end signal to the smoke detector S (step S60). Then, the process ends.

  As described above, the smoke detector S according to the present embodiment is configured to adjust the change in the smoke detection sensitivity derived from the use environment temperature and detect and report the smoke 3 in the detection space 70. is doing.

  In the present embodiment, the adjustment information writing device 94 is provided separately from the smoke detector S. However, the adjustment information writing device 94 is not limited to this, and the adjustment information writing device 94 is used as the smoke detector S. It may be built in. In other words, the microcomputer 80 may be caused to function as the light emission characteristic detecting unit by playing the role of the adjustment information writing device 94.

  Specifically, the adjustment information database 97 is stored in the ROM 91 in advance, and the CPU 90 measures the temperature based on the voltage value of the light reception signal and the temperature data acquired from the temperature sensor 81, and is similar to the light reception signal measuring device 98. Let the function do. In this case, the adjustment information storage unit includes the ROM 91 and the nonvolatile memory 92.

  Then, similarly to the above-described product test at the time of shipment, the smoke detector S is placed at a predetermined temperature, the smoke 3 having a predetermined concentration is supplied into the detection space 70, and the test mode switch 99 is turned on to operate the smoke detector. S is a test mode, the voltage value of the light reception signal output from the light receiving circuit unit 88 is measured by the microcomputer 80 as the light emission characteristic detection unit, and the smoke detection threshold value having the closest value to the voltage value of the light reception signal at a predetermined temperature This can also be realized by selecting a table and writing it in the nonvolatile memory 92 as a predetermined smoke detection threshold table.

  Further, as described above, the adjustment information may be generated without providing the adjustment information database in advance.

  Here, instead of the test mode process shown in FIG. 7, when the microcomputer 80 itself functions as a light emission characteristic detecting unit, that is, when the microcomputer 80 plays the role of the adjustment information writing device 94 This will be described with reference to FIG.

  In the description here, two types of power, low power and high power, are supplied to the light-emitting diode 55, and the correlation equation between the temperature and the smoke detection threshold is obtained from the voltage value of the received light signal obtained at each power. Will be described as adjustment information and stored in the adjustment information storage unit.

  As shown in FIG. 11, in the test mode process, the CPU 90 first determines whether or not the test mode switch is in the ON state (step S120).

  Here, when the CPU 90 determines that the test mode switch is not in the ON state (step S120: No), the process is moved to the address before branching.

  On the other hand, if the CPU 90 determines that the test mode switch is in the ON state (step S120: Yes), the process proceeds to step S121.

  In step S121, the CPU 90 can set the test low power value stored in advance in the ROM 91 to the variable amplifier 84 of the light emitting circuit unit 87, and output the test low power from the variable amplifier 84 to the light emitting diode 55. Then, the process proceeds to step S122.

  Next, the CPU 90 turns on the light emitting diode 55 of the light emitting unit 20 (step S122), and then performs a temperature measurement process for obtaining a temperature signal from the temperature sensor 81 and calculating the temperature around the light emitting unit 20 (step S123). ).

  Then, the CPU 90 acquires the light reception signal from the light receiving circuit unit 88 and stores it in the RAM 86 while corresponding to the measured temperature (step S124).

  When step S124 ends, the CPU 90 determines whether or not the high power measurement is finished (step S125).

  Here, if the CPU 90 determines that the high power measurement has not ended (step S125: No), that is, if it is determined that the low power measurement has only ended, the process proceeds to step S126.

  In step S126, the variable amplifier 84 of the light emitting circuit unit 87 is set so that high power for measurement can be output, and the process proceeds to step S122.

  Thus, in step S122 to step S124 after the variable amplifier 84 is set to high power in step S126, the CPU 90 first connects the light emitting diode 55 of the light emitting circuit unit 87 (light emitting unit 20) to the variable amplifier 84. Lights up with a relatively large amount of light according to the setting (high power) (step S122), acquires information from the temperature sensor 81, performs temperature measurement processing (step S123), and is obtained from the light receiving circuit unit 88. The intensity of the received light signal is measured and stored in the RAM 86 (step S124).

  On the other hand, when the CPU 90 determines that the high power measurement is finished (step S125: Yes), that is, when it is determined that both the low power measurement and the high power measurement are finished, the process proceeds to step S127.

  Next, the CPU 90 generates an approximate expression from the voltage value of the light reception signal at the time of low power and high power stored in the RAM 86 and the temperature around the light emitting unit 20 (step S127).

  Then, the CPU 90 stores the determined smoke detection threshold value table as adjustment information in the nonvolatile memory 92 (step S128).

  Next, the CPU 90 determines whether or not the test mode switch 99 is in an ON state (step S129).

  If the CPU 90 determines that the test mode switch 99 is in the ON state (step S129: Yes), the process proceeds to step S129 again. That is, this step S129 is repeated until the test mode switch 99 is turned off.

  On the other hand, when the CPU 90 determines that the test mode switch 99 is not in the ON state (step S129: No), the process is moved to the address before branching.

  In this way, by performing the processing shown in FIG. 11, the microcomputer 80 can be caused to function as the light emission characteristic detecting unit by taking the role of the adjustment information writing device 94.

[Second Embodiment]
Next, as a second embodiment of the present invention, the detection sensitivity of smoke is made as constant as possible by adjusting the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit. A possible smoke detector D will be described.

  The smoke detector D described in the second embodiment is mainly different from the smoke detector S described in the first embodiment mainly in the configuration of the circuit board 53. Therefore, the same components as those of the smoke detector S described above are denoted by the same reference numerals and description thereof is omitted.

  FIG. 12 is a block diagram showing an electrical configuration of the smoke detector D according to the second embodiment.

  Here, the ROM 110 in the microcomputer 80 is previously provided with adjustment information for adjusting the output (light emission amount) of the light emitting unit 20 based on the temperature calculated from the temperature information from the temperature sensor 81.

  Specifically, the adjustment information can be a variable amplifier output table that indicates the output setting value of the variable amplifier 84 corresponding to each temperature, as shown in FIG.

  According to the table of FIG. 13, the output set value of the variable amplifier 84 when the temperature is 20 ° C. is Y [V], and the output set value of the variable amplifier 84 when the temperature is 0 ° C. is 0.95 × Y [V], The output set value of the variable amplifier 84 at 30 ° C. is 1.02 × Y [V].

  That is, the light emitting element of the smoke detector D uses the light emitting diode 55, and the amount of light emission tends to increase as the temperature decreases with the same power. Therefore, the temperature decreases on the variable amplifier output table. By reducing the voltage of the output setting value of the amplifier, the output (light emission amount) from the light emitting unit 20 is made substantially constant, and the smoke detection sensitivity is made as constant as possible.

  This variable amplifier output table is similar to the smoke detection threshold table described in the first embodiment, and is selected from a plurality of different variable amplifier output table groups (hereinafter referred to as adjustment information databases). A predetermined variable amplifier output table appropriately selected according to individual product differences may be used.

  In the second embodiment, the adjustment information is a table (variable amplifier output table) showing the correspondence between the temperature around the light emitting unit 20 and the output of the variable amplifier, but as described in the first embodiment as well. Needless to say, calculation information (correlation equation) in which the temperature around the light emitting unit 20 and the output of the variable amplifier are associated with each other may be used.

  Further, a preset smoke detection threshold value is stored in the ROM 110, and the CPU 90 determines whether or not the voltage value of the light reception signal from the light receiving circuit unit 88 exceeds the smoke detection threshold value. Detection determination is performed.

  Next, processing of the smoke detector D according to the present embodiment will be described with reference to FIGS. FIG. 14 is a flow showing the main processing of the smoke detector D according to the present embodiment, FIG. 15 is a flow showing the light emission processing, and FIG. 16 is a flow showing the received light signal analysis processing.

  In addition, in the process of the smoke detector D described below, there is a part that performs the same process as in the first embodiment described above, but may be redundantly described for convenience of description.

  First, as shown in FIG. 14, the CPU 90 of the microcomputer 80 functioning as the control unit of the smoke detector D executes initial setting processing such as RAM access permission and work area initialization (step S70). At this time, a smoke detection flag is set in the RAM 86, and the value of the smoke detection flag is set to “0: not detected”.

  Next, the CPU 90 executes a light emission process for emitting light from the light emitting unit 20 toward the detection space 70 (step S71). This light emission process will be described later with reference to FIG.

  Next, the CPU 90 executes a received light signal analysis process for analyzing the received light signal output from the light receiving unit 21 (light receiving circuit unit 88) (step S72).

  In this received light signal analysis process, it is determined whether or not the received light signal sent from the light receiving circuit unit 88 to the microcomputer 80 exceeds the smoke detection threshold value. This received light signal analysis process will be described later in detail with reference to FIG.

  Next, the CPU 90 determines whether or not the reset button 82 has been pressed (step S73).

  If the CPU 90 determines that the reset button 82 has been pressed (step S73: Yes), the process proceeds to step S70, and initialization is performed again.

  On the other hand, if the CPU 90 determines that the reset button 82 has not been pressed (step S73: No), the process proceeds to step S74.

  In step S74, the CPU 90 refers to the RAM 86 and determines whether or not the smoke detection flag is “1: smoke detection”.

  Here, when it is determined that the smoke detection flag is not “1: smoke detection” (step S75: No), the process proceeds to step S71, and the light emission process (step S71) is executed.

  If it is determined that the smoke detection flag is “1: smoke detection” (step S74: Yes), the process proceeds to step S75 assuming that smoke is detected.

  In step S75, an alarm issuing process for notifying that smoke has been detected is performed. In this alarm issuing process, for example, an alarm sound or a voice is output from the speaker 63 built in the smoke detector S.

  Next, in step S76, the CPU 90 determines whether or not it has been reset.

  If it is determined in step S76 that the reset has not been performed (step S76: No), the process of step S76 is performed again. That is, the alarm is maintained until it is reset.

  On the other hand, if it is determined in step S76 that the reset has been made (step S76: Yes), the process proceeds to step S70 to perform initial setting.

  Note that the “reset” determined in step S76 or step S73 described above not only determines whether the reset button 82 has been pressed, but also a reset signal can be remotely controlled by a fire alarm system (not shown). It may be determined whether or not it has been received.

  Next, the light emission process performed in step S71 will be described in detail with reference to FIG.

  In the light emission process, first, the CPU 90 acquires temperature data from the temperature sensor 81 and performs a temperature measurement process for calculating the temperature around the light emitting unit 20 (step S80).

  Next, the CPU 90 refers to the variable amplifier output table (adjustment information) stored in advance in the ROM 110 (adjustment information storage unit), collates with the measured temperature (step S81), and power corresponding to the measured temperature. A value is determined (step S82). In the second embodiment, the voltage value is used as the power value. However, the present invention is not limited to this, and a current value or a value obtained by multiplying the current and the voltage may be determined.

  Next, the CPU 90 sets the variable amplifier 84 of the light emitting circuit unit 87 so that the power value determined in step S82 can be output (step S83).

  Then, the CPU 90 energizes the light emitting circuit unit 87 to cause the light emitting unit 20 (light emitting diode 55) to emit light at the power value determined above (step S84). When this process ends, the CPU 90 moves the process to the address before branching.

  Next, the received light signal analysis process performed in step S72 will be described with reference to FIG.

  In the received light signal analysis process, first, the CPU 90 stores the received light signal obtained from the light receiving circuit unit 88 in the RAM 86 for a predetermined time (for example, 0.1 second) (step S90).

  Next, the CPU 90 calculates the average value of the light reception signal voltage based on the light reception signal for a predetermined time stored in the RAM 86 (step S91).

  Further, the CPU 90 acquires temperature data from the temperature sensor 81 and performs a temperature measurement process for measuring the temperature around the light emitting unit 20 (step S92).

  Then, the CPU 90 acquires a smoke detection threshold value stored in advance in the ROM 110 (adjustment information storage unit) (step S93).

  Subsequently, the CPU 90 compares the smoke detection threshold acquired in step S93 with the average value of the voltage calculated in step S91, and determines whether or not the average value of the light reception signal voltage is larger than the smoke detection threshold. Is performed (step S94).

  Here, when it is determined that the average value of the voltage is larger than the smoke detection threshold (step S94: Yes), a flag “1: smoke detection” is set in the smoke detection flag (step S95), and before branching. Return to address.

  On the other hand, when it is determined that the average value of the voltage of the received light signal is not larger than the smoke detection threshold (step S94: No), the process proceeds to step S96.

  In step S96, the CPU 90 refers to a timer (not shown) built in the microcomputer 80 and determines whether or not a predetermined light emission time (for example, 1 second) has ended.

  If the CPU 90 determines that the predetermined light emission time has not ended (step S96: No), the process proceeds to step S90.

  On the other hand, when the CPU determines that the light emission time has ended (step S96: Yes), the light emitting diode 55 of the light emitting circuit unit 87 is turned off (step S97), and the processing is shifted to the address before branching.

[Third Embodiment]
Next, as a third embodiment of the present invention, the detection sensitivity of smoke is made as constant as possible by adjusting the output (light reception signal voltage) from the light receiving unit 21 according to the temperature measurement result around the light emitting unit. A smoke detector E that can be used will be described.

  Note that the smoke detector E described in the third embodiment is mainly a circuit as compared with the smoke detector S described in the first embodiment and the smoke detector D described in the second embodiment. The configuration of the substrate 53 is partially different. Therefore, the same components as those of the smoke detector S and the smoke detector D described above are denoted by the same reference numerals and description thereof is omitted.

FIG. 17 is a block diagram showing an electrical configuration of the smoke detector E according to the third embodiment.
Here, as a characteristic feature of the third embodiment, the light receiving circuit unit 88 is provided with a variable amplifier 111 that amplifies the voltage value of the light receiving signal output from the IV amplifier 85.

  The ROM 110 in the microcomputer 80 stores adjustment information in advance as in the second embodiment. However, the adjustment information stored in the third embodiment adjusts the output (light reception signal voltage) of the light receiving unit 21 (variable amplifier 111) based on the temperature calculated from the temperature information from the temperature sensor 81. To do.

  Specifically, the adjustment information can be a variable amplifier amplification ratio table indicating the amplification ratio of the variable amplifier 84 corresponding to each temperature as shown in FIG.

  According to the table of FIG. 18, the amplification rate of the variable amplifier 111 when the temperature is 20 ° C. is 1 [times], the amplification rate of the variable amplifier 84 when the temperature is 0 ° C. is 0.93 [times], and the case of 30 ° C. The amplification ratio of the variable amplifier 84 is 1.05 [times].

  That is, the light emitting element of the smoke detector E uses the light emitting diode 55, and the light emission tends to increase as the temperature decreases with the same power. Therefore, on the variable amplifier amplification ratio table, the temperature decreases. By reducing the amplification rate of the variable amplifier, the output (light emission amount) from the light emitting unit 20 is made substantially constant, and the smoke detection sensitivity is made as constant as possible.

  The variable amplifier amplification ratio table emits light from a plurality of different variable amplifier amplification ratio table groups (hereinafter referred to as adjustment information databases), similarly to the smoke detection threshold table described in the first embodiment. A predetermined variable amplifier amplification ratio table that is appropriately selected according to individual product differences of the diode 55 may be used.

  In the third embodiment, the adjustment information is a table (variable amplifier amplification ratio table) indicating the correspondence between the temperature around the light emitting unit 20 and the amplification ratio of the variable amplifier. However, the adjustment information is also described in the first embodiment. In this way, it goes without saying that the calculation information (correlation equation) in which the temperature around the light emitting unit 20 is associated with the amplification ratio of the variable amplifier may be used.

  Also, a preset smoke detection threshold value is stored in the ROM 110, and whether the voltage value of the light reception signal from the light receiving circuit unit 88 (the voltage value after amplification by the variable amplifier 111) exceeds the smoke detection threshold value. Whether the smoke is detected or not is determined by the CPU 90.

  Next, processing of the smoke detector E according to the present embodiment will be described with reference to FIG. FIG. 19 is a flow showing the received light signal analysis processing of the smoke detector E according to the present embodiment. The main flow of the smoke detector E according to the third embodiment is the same as that of FIG. 14 shown in the second embodiment, and the light emission process is the same as that of FIG. 8 shown in the first embodiment. Therefore, the description is omitted.

  In the received light signal analysis process, the CPU 90 of the microcomputer 80 functioning as the control unit of the smoke detector E first acquires temperature data from the temperature sensor 81 and measures the temperature around the light emitting unit 20 as shown in FIG. A temperature measurement process is performed (step S100).

  Next, the CPU 90 refers to the adjustment information in the ROM 110 (adjustment information storage unit) and determines the amplification ratio corresponding to the temperature measured in step S100 (step S101).

  Subsequently, the CPU 90 sets the variable amplifier 111 of the light receiving unit 21 (light receiving circuit unit 88) to the amplification ratio determined in step S101 (step S102).

  Then, with the amplification ratio of the variable amplifier 111 set as described above, the received light signal obtained from the light receiving circuit unit 88 is stored in the RAM 86 for a predetermined time (for example, 0.1 second) (step S103).

  Next, the CPU 90 calculates the average value of the voltage of the received light signal based on the received light signal for a predetermined time stored in the RAM 86 (step S104).

  Subsequently, the CPU 90 compares the smoke detection threshold value stored in advance in the ROM 110 with the average voltage value calculated in step S104, and determines whether or not the average voltage value of the received light signal is greater than the smoke detection threshold value. Is determined (step S105).

  Here, when it is determined that the average value of the voltage is larger than the smoke detection threshold (step S105: Yes), a flag “1: smoke detection” is set in the smoke detection flag (step S106), and before branching. Return to address.

  On the other hand, if it is determined that the average value of the light reception signal voltage is not greater than the smoke detection threshold (step S105: No), the process proceeds to step S107.

  In step S107, the CPU 90 refers to a timer (not shown) built in the microcomputer 80 and determines whether or not a predetermined light emission time (for example, 1 second) has ended.

  If the CPU 90 determines that the predetermined light emission time has not ended (step S107: No), the process proceeds to step S103.

  On the other hand, when the CPU determines that the light emission time has ended (step S107: Yes), the light emitting diode 55 of the light emitting circuit unit 87 is turned off (step S108), and the process is shifted to the address before branching.

  As described above, according to the present invention, the main body case (for example, the main body case 9) and the light emitting unit (for example, the light emitting unit 20) that emits light to the detection space (for example, the detection space 70) in the main body case. ), A light receiving unit (for example, the light receiving unit 21) that receives scattered light from the light emitting unit due to smoke that has entered the detection space, and controls the light emitting unit to emit light to the detection space. In this case, a smoke detector including a control unit (for example, the microcomputer 80) that determines that smoke has entered the detection space when the output from the light receiving unit at this time is equal to or greater than a predetermined smoke detection threshold. Temperature detection unit (for example, temperature sensor 81) that detects the ambient temperature of the light emitting unit, and adjustment information for the ambient temperature of the light emitting unit, and adjustment information corresponding to individual differences of the light emitting unit (for example, smoke detection) Threshold table and correlation equation of temperature and threshold) A stored adjustment information storage unit (for example, a non-volatile memory 92), and the control unit calculates the smoke detection threshold value from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. By using a smoke detector (for example, smoke detector S) that performs correction, the smoke detection sensitivity is made as constant as possible even when the ambient temperature of the light emitting unit changes. It is possible to provide a smoke detector that can

  In addition, a temperature detection unit that detects the ambient temperature of the light emitting unit, and an adjustment information storage unit (for example, ROM 110) that stores adjustment information (for example, a variable amplifier output table) for the ambient temperature of the light emitting unit, The control unit corrects the output of the light emitting unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit, for example, a smoke detector (for example, smoke detector D) By doing so, it is possible to provide a smoke detector capable of making the smoke detection sensitivity as constant as possible.

  Further, a temperature detection unit that detects the ambient temperature of the light emitting unit, and an adjustment information storage unit (for example, ROM 110) that stores adjustment information (for example, a variable amplifier amplification ratio table) for the ambient temperature of the light emitting unit. The control unit corrects the output of the light receiving unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. ), It is possible to provide a smoke detector capable of making the smoke detection sensitivity as constant as possible.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications other than the above-described embodiments can be made according to the design and the like as long as they do not depart from the technical idea according to the present invention.

  In the present specification, the smoke detector that adjusts the smoke detection threshold according to the temperature measurement result around the light emitting unit is the first embodiment, and the output (light emission amount) from the light emitting unit according to the temperature measurement result around the light emitting unit. The smoke detector to be adjusted is described separately in the second embodiment, and the smoke detector that adjusts the output from the light receiving unit according to the temperature measurement result around the light emitting unit is described separately in the third embodiment. Needless to say, it may be a combined smoke detector.

It is explanatory drawing which showed the use condition of the smoke detector which concerns on 1st Embodiment. It is sectional drawing of the smoke detector which concerns on 1st Embodiment. It is the top view of the cap part which concerns on 1st Embodiment, and explanatory drawing which expanded a part of labyrinth wall in planar view. It is the block diagram which showed the electrical structure of the smoke detector which concerns on 1st Embodiment. It is explanatory drawing which showed the concept of the adjustment information and adjustment information database which concern on 1st Embodiment. It is the flow which showed the process of the smoke detector which concerns on 1st Embodiment. It is the flow which showed the process of the smoke detector which concerns on 1st Embodiment. It is the flow which showed the process of the smoke detector which concerns on 1st Embodiment. It is the flow which showed the process of the smoke detector which concerns on 1st Embodiment. It is the flow which showed the process in the adjustment information writing device which concerns on 1st Embodiment. It is the flow which showed the process of the smoke detector which concerns on 1st Embodiment. It is the block diagram which showed the electrical structure of the smoke detector which concerns on 2nd Embodiment. It is explanatory drawing which showed the concept of the adjustment information which concerns on 2nd Embodiment. It is the flow which showed the process of the smoke detector which concerns on 2nd Embodiment. It is the flow which showed the process of the smoke detector which concerns on 2nd Embodiment. It is the flow which showed the process of the smoke detector which concerns on 2nd Embodiment. It is the block diagram which showed the electrical structure of the smoke detector which concerns on 3rd Embodiment. It is explanatory drawing which showed the concept of the adjustment information which concerns on 2nd Embodiment. It is the flow which showed the process of the smoke detector which concerns on 3rd Embodiment.

Explanation of symbols

3 Smoke 9 Body case
10 Perimeter wall structure
20 Light emitter
21 Receiver
53 Circuit board
55 Light emitting diode
56 photodiode
80 microcomputer
81 Temperature sensor
84 Variable amplifier
85 IV amplifier
86 RAM
87 Light emitting circuit
88 Receiver circuit
90 CPU
91 ROM
92 Nonvolatile memory
94 Adjustment information writing device
97 Adjustment information database
99 Test mode switch
110 ROM
111 Variable amplifier A Smoke sensor D Smoke detector E Smoke detector S Smoke detector

Claims (14)

A body case,
A light emitting unit for emitting light to the detection space in the main body case;
A light receiving unit for receiving scattered light from the light emitting unit due to smoke entering the detection space;
A control unit that controls the light emitting unit to emit light to the detection space, and determines that smoke has entered the detection space when the output from the light receiving unit at this time is equal to or greater than a predetermined smoke detection threshold; In a smoke detector with
A temperature detection unit for detecting the ambient temperature of the light emitting unit;
Adjustment information for the ambient temperature of the light emitting unit, and an adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, and
The smoke detector is characterized in that the control unit corrects the smoke detection threshold value from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. The adjustment information is a table or calculation information in which the ambient temperature of the light emitting unit is associated with a smoke detection threshold,
The control unit reads out the smoke detection threshold corresponding to the ambient temperature of the light emitting unit detected by the temperature detection unit from the adjustment information storage unit, and sets the smoke detection threshold as the predetermined smoke detection threshold. The smoke detector according to claim 1. An input unit for inputting information from the adjustment information writing device;
An output unit that outputs the output from the light receiving unit to the adjustment information writing device,
When the control unit acquires a power setting command from the adjustment information writing device via the input unit during the test mode of the smoke detector, the control unit emits light from the light emitting unit to the detection space. The light receiving signal output from the light receiving unit is output to the adjustment information writing device via the output unit, and the adjustment information generated by the adjustment information writing device based on the output from the light receiving unit is output to the adjustment information writing device. The smoke detector according to claim 1 or 2, wherein the smoke information is input through an input unit, and the input adjustment information is stored in the adjustment information storage unit.   The smoke detector according to claim 3, wherein when the power setting command is acquired, the control unit sequentially emits light from the light emitting unit to the detection space at two or more points with different intensities.   The adjustment information generated by the adjustment information writing device is information generated based on a light reception signal output from the light receiving unit when the temperature of the light emitting unit is changed by two or more points. The smoke detector according to claim 3 or 4. A light emission characteristic detecting unit for detecting the light emission characteristic of the light emitting unit;
A plurality of adjustment information for the ambient temperature of the light emitting unit is stored in the adjustment information storage unit corresponding to the detection result in the light emission characteristic detection unit,
The said control part reads the adjustment information corresponding to the detection result of the said light emission characteristic detection part from the said adjustment information storage part, and correct | amends the said smoke detection threshold value, The Claim 1 or Claim 2 characterized by the above-mentioned. Smoke detector. A light emission characteristic detecting unit for detecting the light emission characteristic of the light emitting unit;
The said control part produces | generates the said adjustment information according to the detection result by the said light emission characteristic detection part, and memorize | stores the said adjustment information in the said adjustment information storage part. smoke detector. The light emission characteristic detection unit detects a light emission characteristic of the light emitting unit by detecting a light emission level of each of the light emitting units when the power supplied to the light emitting unit is changed by two or more points. The smoke detector according to claim 6 or 7. The light emission characteristic detection unit detects a light emission characteristic of the light emitting unit by detecting a light emission level of each of the light emitting units when the temperature of the light emitting unit is changed by two or more points. 9. The smoke detector according to any one of items 8. The smoke detector according to any one of claims 6 to 9, wherein the light emission characteristic detection unit detects a light emission level of the light emission unit when the smoke detector is in a test mode. A body case,
A light emitting unit for emitting light to the detection space in the main body case;
A light receiving unit for receiving scattered light from the light emitting unit due to smoke entering the detection space;
A smoke detector comprising: a control unit that controls the light emitting unit to emit light to the detection space, and detects intrusion of smoke into the detection space based on an output from the light receiving unit at this time In
A temperature detection unit for detecting the ambient temperature of the light emitting unit;
Adjustment information for the ambient temperature of the light emitting unit, and an adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, and
The control unit corrects the output of the light emitting unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. The light emitting unit includes a variable amplifier that amplifies the control signal of the control unit so that power adjustment is possible, and a light emitting element that emits light based on the control signal adjusted in power by the variable amplifier,
The said control part correct | amends the output of the said light emission part by controlling the said variable amplifier from the detection information of the said temperature detection part, and the adjustment information memorize | stored in the said adjustment information storage part. Item 12. The smoke detector according to Item 11. A body case,
A light emitting unit for emitting light to the detection space in the main body case;
A light receiving unit for receiving scattered light from the light emitting unit due to smoke entering the detection space;
A smoke detector comprising: a control unit that controls the light emitting unit to emit light to the detection space, and detects intrusion of smoke into the detection space based on an output from the light receiving unit at this time In
A temperature detection unit for detecting the ambient temperature of the light emitting unit;
Adjustment information for the ambient temperature of the light emitting unit, and an adjustment information storage unit that stores adjustment information corresponding to individual differences of the light emitting unit, and
The control unit corrects the output of the light receiving unit from the detection result of the temperature detection unit and the adjustment information stored in the adjustment information storage unit. The light receiving unit includes a light receiving element and a variable amplifier that amplifies the output of the light receiving element,
The control unit corrects the output of the light receiving unit by controlling the variable amplifier from a detection result of the temperature detection unit and adjustment information stored in the adjustment information storage unit. Item 14. The smoke detector according to item 13.

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