JP2702043B2 - Photoelectric separated smoke detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric separation type smoke detector in which a light emitter and a light receiver are arranged separately, and a fire is detected by detecting attenuation of light caused by smoke between the light emitter and the light receiver.

[0002]

2. Description of the Related Art In this type of photoelectric separation type smoke detector, if the optical axes of the light emitter and the light receiver do not coincide with each other, they will not operate normally. For example, as shown in Japanese Utility Model Application Laid-Open No. Various proposals for coordination have been made. FIG. 7 shows a conventional photoelectric-separated smoke detector. A light-emitting element 11 and a lens 12 for smoke detection, and a light-receiving element 21 and a lens 22 are provided in a light projector 10 and a light receiver 20, respectively. The light receiving element 21 detects smoke in the near infrared region, for example.

A light emitting element 13 in the visible light region for adjusting the optical axis is coaxially fixed to the light projector 10 behind the light emitting element 11, and a light receiving element 20 is similarly provided behind the light receiving element 21. The light-emitting element 23 for adjusting the optical axis is coaxially fixed to the optical axis. Therefore, the serviceman visually checks the light of the light emitting element 23 that has passed through the lens 22 on the light receiver 20 side from the direction of the light projector 10 in a dark place to determine whether or not the optical axis of the light receiver 20 is aligned. It can be confirmed, and whether or not the optical axis of the projector 10 is aligned is confirmed by visually checking the light of the light emitting element 13 that has passed around the lens 12 on the side of the projector 10 from the direction of the light receiver 20. be able to.

FIG. 8 shows another conventional example. In this case, the light emitting elements 13 and 33 for adjusting the optical axis are detachably attached to the light emitter 10 and the light receiver 20, respectively. The light emitting element 11 and the light receiving element 21 of the light receiver 20 are attached so as to be parallel to the respective optical axes. The light emitting elements 14 and 24 in the visible light region attached to the light emitter 10 and the light receiver 20, respectively, flash downward by a fire receiver (not shown) at a predetermined cycle, for example, during normal monitoring, and have a predetermined density. It is controlled so as to be continuously turned on when the above smoke is detected, or to blink or light only when the smoke having a predetermined density or more is detected.
In addition, the smoke detector is caused to emit an alarm by pseudo smoke, and the light emitting elements 14 and 24 are turned on or off to check whether or not the smoke detector is normal.

[0005]

However, in the above-mentioned conventional smoke detector, the light emitting elements 13 and 23 for adjusting the optical axis are used only at the time of installation and maintenance of the detector. Despite sometimes not being used,
There is a problem in that it is expensive because it must be taken into consideration at the time of circuit design and mechanism design.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a photoelectric separation type smoke detector capable of adjusting each optical axis of a light emitter and a light receiver with an inexpensive configuration in which the number of parts is reduced. And

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a photoelectric separation type in which a light emitter and a light receiver are arranged separately and a fire is sensed by detecting light attenuation due to smoke between the light emitter and the light receiver. In the smoke detector, a visible light emitting element that emits light so as to coincide with each optical axis of the light emitter and the light receiver is provided, and an optical member that transmits each light of the light emitting element and reflects downward is provided. Wherein the light emitting element emits light at the time of optical axis adjustment and at the time of alarm.

The present invention also relates to a photoelectric separation type smoke detector in which a light emitter and a light receiver are arranged separately, and a fire is detected by detecting light attenuation due to smoke between the light emitter and the light receiver. A visible light-emitting element that emits light so as to coincide with the optical axis is provided, and an openable door and an optical member that reflects each light of the light-emitting element downward with the door closed when an alarm is issued are provided. The light-emitting device is provided so that the light-emitting element emits light when the door is opened during optical axis adjustment.

[0009]

According to the present invention, since the light emitting element is used for both adjusting the optical axis and issuing a signal, the optical axes of the light emitter and the light receiver can be adjusted with an inexpensive structure with a reduced number of parts. it can.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a photoelectric separation type smoke detector according to the present invention, and the same components as those described in the conventional example are denoted by the same reference numerals. In FIG. 1, a light emitting element 11 and a lens 12 for smoke detection, and a light receiving element 21 and a lens 22 are provided in a light projector 10a and a light receiver 20a, respectively. To detect smoke. Further, the light emitters 10a and the light receivers 20a further include light emitting elements 15 and 25 in the visible light region which also serve as optical axis adjustment and alarm display (and normal monitoring display), respectively. Are mounted in parallel with each optical axis.

As shown in detail in FIG. 2, the optical axes of the light emitting elements 15 and 25 respectively transmit the light emitted from the light emitting elements 15 and 25 as they are and direct them toward the light receiver 20a and the light projector 10a. Spectroscopes 16 and 2 for reflecting the light emitted from the elements 15 and 25 at right angles and directing them downward.
The spectrometers 16 and 26 are both formed of, for example, a polycarbonate resin or an acrylic resin so that the side cross-section becomes trapezoidal.

The structure of the spectroscopes 16 and 26 will be described in detail with reference to FIG.
C are both formed at right angles, and the light emitting elements 15 and 25 are arranged on the surface AD side of the spectroscopes 16 and 26. And the surface AD
And the angle of the surface AB coincides with the incident angle of light of the light emitting elements 15 and 25 and the critical angle of the spectroscopes 16 and 26, and the light of the light emitting elements 15 and 25 is reflected in the direction of the surface DC, that is, downward. (Snell's law).

In such a configuration, the light projector 10a and the light receiver 20a are horizontally installed at a predetermined distance on a ceiling or the like, and detect fire attenuation by detecting light attenuation due to smoke therebetween. In this case, the light-emitting elements 15 and 25 blink at a predetermined cycle during normal monitoring (normal monitoring display), and are continuously lit when smoke of a predetermined density or more is detected (warning display) or at a predetermined density. It is controlled so as to blink or light only when the above-mentioned smoke is detected, and the smoke detector is caused to emit light by pseudo-smoke to blink or light. , 26, it can be confirmed that the smoke detector has issued an alarm, and it can be checked whether the smoke detector is normal.

At the time of installation or maintenance, a serviceman visually checks the light of the light emitting element 25 transmitted through the spectroscope 26 on the light receiving device 20a side from the direction of the light emitting device 10a in a dark place, so that the light of the light receiving device 20a can be confirmed. It can be checked whether the axes are aligned or not.
The light of the light emitting element 15 that has passed through the spectroscope 16 on the side of the light projector 10a from the direction shown in FIG.
It can be confirmed whether or not the optical axes are aligned.

Therefore, according to the above embodiment, since the light emitting elements 15 and 25 serve both for adjusting the optical axis of the light emitter 10a and the light receiver 20a and for displaying the alert (and for the normal monitoring display), the number of parts is reduced. The optical axes of the light emitter and the light receiver can be adjusted with a reduced and inexpensive configuration. The spectroscope 16,
26 is not limited to a trapezoidal side cross section as shown in FIG. 2, for example, a wedge-shaped side cross section as shown in FIG. 3 (a), or a transmission side as shown in FIG. 3 (b). And a shape for reflection may be formed separately.

Next, a second embodiment will be described with reference to FIGS. 4 to 6 show only the light projector 10b, and the light receiver (not shown) is the light receiving element 21 for smoke detection.
The structure is the same except for the lens and the lens 22. The projector 10b (and the light receiver) is provided with a door 17 that can be opened and closed at 90 degrees between a horizontal plane and a vertical plane.
Is provided with a reflecting member 18 corresponding to the light emitting element 15 which is used for both optical axis adjustment and alarm display (and normal monitoring display).

As shown in detail in FIG. 6, the reflection member 18 is formed of, for example, a polycarbonate resin or an acrylic resin so that a side cross-section thereof becomes a substantially right-angled isosceles triangle. Is configured to totally reflect the light of the light emitting element 15 when is closed. Therefore, at the time of installation and maintenance, FIG.
By opening the door 17 as shown in FIG. 7, the light of the light emitting element 15 on the side of the light emitter 10b can be visually checked from the direction of the light receiver to determine whether or not the optical axis of the light emitter 10b is aligned. Further, at the time of normal monitoring or alerting, as shown in FIG. 5, by closing the door 17, the light of the light emitting element 15 can be visually checked from below.

[0018]

As described above, the present invention relates to a photoelectric separation type smoke detector in which a light emitter and a light receiver are arranged separately and a fire is detected by detecting light attenuation caused by smoke between the light emitter and the light receiver. Along with providing a visible light emitting element that emits light so as to coincide with each optical axis of the light emitter and the light receiver,
An optical member that transmits each light of the light emitting element and reflects the light downward is provided, and the light emitting element emits light at the time of optical axis adjustment and at the time of alerting, so that the light emitting element is used for both optical axis adjustment and alerting. Therefore, it is possible to adjust each optical axis of the light emitter and the light receiver with an inexpensive configuration in which the number of parts is reduced.

According to the present invention, there is further provided a photoelectric separation type smoke detector in which a light emitter and a light receiver are separately arranged and a fire is detected by detecting attenuation of light caused by smoke between the light emitter and the light receiver. A visible light-emitting element that emits light so as to coincide with the optical axis is provided, and an openable door and an optical member that reflects each light of the light-emitting element downward with the door closed when an alarm is issued are provided. Since the light emitting element emits light when the door is open at the time of optical axis adjustment, the light emitting element can be used for both optical axis adjustment and alarming, and therefore, with an inexpensive configuration with a reduced number of parts. Each optical axis of the projector and the light receiver can be adjusted.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a photoelectric separation type smoke detector according to the present invention.

FIG. 2 is an explanatory diagram showing the spectroscope of FIG. 1 in detail;

FIG. 3 is a side view showing a modified example of the spectroscope of FIGS. 1 and 2;

FIG. 4 is a schematic configuration diagram showing a state in which a door of a projector according to a second embodiment is opened.

FIG. 5 is a schematic configuration diagram showing a state where a door of a projector according to a second embodiment is closed.

FIG. 6 is a side view showing the spectroscope of FIGS. 4 and 5 in detail;

FIG. 7 is a schematic configuration diagram showing a conventional photoelectric separation type smoke detector.

FIG. 8 is a schematic configuration diagram showing another conventional photoelectric separation type smoke detector.

[Explanation of symbols]

 10a, 10b: Projector 11, 15, 25: Light-emitting device 12, 22: Lens 16, 26: Spectroscope 17: Door 18: Reflecting member 20a: Light-receiving device 21: Light-receiving device

Claims (2)

(57) [Claims] 1. A photoelectric separation type smoke detector in which a light emitter and a light receiver are separately arranged and a fire is detected by detecting light attenuation due to smoke between the light emitter and the light receiver, wherein each light axis of the light emitter and the light receiver is provided. A visible light emitting element that emits light so as to coincide with each other is provided, and an optical member that transmits each light of the light emitting element and reflects downward is provided, and the light emitting element is adjusted at the time of optical axis adjustment and at the time of alarm, respectively. A photoelectric separation type smoke detector that emits light. 2. A photoelectric separation type smoke detector in which a light emitter and a light receiver are separately arranged and a fire is detected by detecting light attenuation due to smoke between the light emitter and the light receiver, wherein each light axis of the light emitter and the light receiver is provided. A visible light-emitting element that emits light so as to coincide with each other is provided, and an openable and closable door and an optical member that reflects each light of the light-emitting element downward with the door closed when an alarm is issued are provided, A photoelectric-separated smoke detector, wherein the light-emitting element emits light when the door is open during axis adjustment.