JPH035895Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a dimming type smoke monitoring device.

[Background technology]

A dimming type smoke monitoring device includes a floodlight having a smoke monitoring light emitting element such as an infrared light emitting diode, a light receiver having a smoke monitoring light emitting element such as a photodiode that receives light from the light emitting element, and an alarm such as a buzzer. It is equipped with a container. In this specification, "light" includes visible light and infrared light. Irradiated light from the light emitting element of the projector is normally incident on the light receiving element, and when smoke occurs, the amount of incident light is reduced due to scattering of the emitted light, thereby activating the alarm. For such an operation, it is necessary to accurately align the optical axis of the light emitting element and the optical axis of the light receiving element. However, emitters and receivers are typically placed a considerable distance apart, for example about 100 meters, for smoke monitoring over a wide area. Therefore, sufficient care is required in the above-mentioned optical axis alignment. Optical axis alignment becomes more difficult at night or in a dark place.

Conventionally, when aligning the optical axis at night or in a dark place, the following procedure was used. A flashlight is fixed to each of the emitter and receiver and turned on, and the worker looks at the light from the flashlight on the emitter side through the collimator of the receiver.
Change the position and posture of the light receiver and fix the light receiver in a state that looks the brightest. Next, contrary to the above, perform the same operation by looking through the collimator of the projector at the light from the flashlight on the receiver side.

In such a conventional optical axis alignment method, firstly, two
Two flashlights are required, and it is inconvenient to carry them.The light intensity tends to be insufficient due to battery consumption.Secondly, the optical axis of the flashlight and the optical axes of the light emitting element and light receiving element must be accurately aligned. It is difficult to fix the flashlight in alignment, and if it is misaligned, the optical axes of the light-emitting element and light-receiving element will be misaligned, no matter how precisely you align the optical axes of the flashlight and collimator. Thirdly, there was the problem of the inconvenience of having to remove both flashlights after the work was completed.

[Purpose of invention]

The purpose of this invention is to solve the above conventional problems,
An object of the present invention is to provide a dimming type smoke monitoring device that allows easy and accurate optical axis alignment.

[Disclosure of invention]

The attenuation smoke monitoring device of this invention includes a smoke monitoring light emitting element, a first visible light emitting element for optical axis alignment whose optical axes are parallel to each other, and a first optical axis alignment collimator. a smoke monitoring light receiving element; a second visible light emitting element for optical axis alignment with respect to the first optical axis alignment collimator with the light receiving element and the optical axis parallel to each other; a light receiver having a second collimator for optical axis alignment with respect to the first visible light emitting element for optical axis alignment; and switching the first and second visible light emitting elements for optical axis alignment between operation and non-operation. It is equipped with a switch part.

An embodiment of this invention will be explained based on FIGS. 1 to 3. In the figure, t indicates the electrical circuit of the light projector T, and j indicates the electrical circuit of the light receiver J, both of which are connected via a power line I. In the floodlight T, _L1 is an infrared light emitting diode for smoke monitoring;
L ₂ is a visible light emitting diode for first optical axis alignment;
A and B are drivers for the light emitting diodes L ₁ and L ₂ , respectively. DB ₁ is a diode bridge connected to power supply line 1, and C is a comparator, whose positive input terminal is connected to the positive and negative terminals of bridge DB ₁ through resistors R ₁ and R ₁ , respectively, and its negative input terminal are connected to the positive and negative terminals of the bridge DB ₁ via a resistor R ₂ that creates a reference voltage and a Zener diode D _{2 ,} respectively. Drivers A and B are each connected between the positive and negative poles of bridge DB ₁ , and the output terminal of comparator C is
It is connected directly to the trigger terminal of driver A and to the trigger terminal of driver B via inverter D, respectively.

In the photoreceiver J, PD is an infrared photodiode for smoke monitoring, _L3 is a visible light emitting diode for second optical axis alignment, and E and F are drivers for the photodiode PD and light emitting diode _L3, respectively.
DB ₂ is a diode bridge connected to both terminals 2 and 3 of the receiver (not shown), G and H are voltage regulators each connected between the two poles of bridge DB ₂ , and regulator G is a high level The regulator H outputs a low level. The switch section Sw consists of two interlocking switches Sw ₁ and Sw _{2. Switch Sw 1 selectively} connects the output terminals of regulators G and H to power supply line 1, and switch Sw ₂ connects the output terminals of regulators G and H to power supply line 1.
The positive terminal of DB ₂ is selectively connected to drivers E and F. When the switch Sw ₁ is connected to the high level regulator G, the switch Sw ₂ is connected to the driver E of the photodiode PD. bridge
DB ₁ and DB ₂ are for responding to connection errors of the positive and negative terminals of the line.

The operation will be explained using the time chart shown in FIG. The outputs of regulators G and H are, for example, 15V and 10V, and the reference level of comparator C is, for example, 6V.

When aligning the optical axis, connect the switch part Sw to the 10V side. As a result, in the receiver J, the driver E
is in a non-operating state, and the driver F is in an operating state. In the projector T, 10V is divided by resistors R ₁ and R ₁ to become 5V at point P, which is compared with 6V at point Q, so that point R is at low level and point S is at high level. Therefore, driver A is inactive and driver B is in active state. As a result of the above, the light-emitting diodes L ₂ and L ₃ for optical axis alignment are lit. The specific structure and work for optical axis alignment will be described later.

When the optical axis alignment is completed, press the switch part Sw.
Connect to the 15V side. As a result, in the light emitter J, the driver E is in operation and the driver F is in a non-operation state. In the projector T, 15V is divided into 7.5V at point P, which is compared with 6V at point Q, so point R becomes high level and point S becomes low level. Therefore, driver A is in operation and driver B is in non-operation state. With the above, the light emitting diode D ₁ and photo diode for smoke monitoring
PD becomes operational.

Next, the collimators 4 and 5 will be explained. Collimators 4 and 5 are constructed by fixing light input rings 4a and 5a and light output rings 4b and 5b, which are separated in the optical axis direction, to the side plates of the emitter T and receiver J, respectively, so that their optical axes coincide. ing. The inner diameter of the light input and output rings is 1mmφ,
The spacing is 15cm. In the projector T, collimator 4
and the optical axes of the two light emitting diodes L ₁ and L ₂ are parallel to each other. At the receiver J,
The optical axis of the collimator 5, the optical axis of the photodiode PD, and the optical axis of the light emitting diode _L3 are also parallel to each other. The correlation between the three optical axes in the projector T and the three optical axes in the receiver J are the same.

For example, temporarily attach the emitter T and receiver J with a distance of 100 mm. When the switch part Sw is switched to the 10V side, the light-emitting diodes L ₂ and L ₃ for optical axis alignment light up.
The light from the light emitting diode L ₂ on the side of the projector T is looked through the collimator 5 on the side of the receiver J, and the receiver J is adjusted and fixed at a position and posture where it looks the brightest. Next, contrary to the above, connect the light emitting diode on the receiver J side.
Peek at the light from L ₃ through the collimator 4 on the T side of the projector and adjust and fix it in the same way. Light emitting diode L ₂ ,
The irradiation angle α of L ₃ is 4 to 5 degrees, and by aligning the optical axes from both as described above, the optical axis of the light emitting diode L ₁ for smoke detection and the optical axis of the photodiode PD are accurately aligned. . Illumination angle β of light emitting diode L ₁
is about 1 degree, but it is incident on the photodiode PD due to the optical axis alignment described above.

In the case of this embodiment, in addition to the effects of the invention described later, the operation of drivers A and B on the emitter T side can be switched by remote control linked to the operation switching of drivers E and F by the switch section Sw on the receiver J side. This has the advantage of better workability compared to the case where a separate switch section is provided.

The following form is also an example of this invention. Those that use a laser generator instead of a light emitting diode, those that use a light receiving element such as a photodiode or phototransistor and a lamp connected to it instead of a collimator, those that use a switch section only on the emitter side, and the switch section These include those that have a collimator on both the emitter and receiver, and those that have a collimator in one tube.

[Effect of idea]

According to the dimming type smoke monitoring device of this invention, a visible light emitting element for optical axis alignment and a collimator for optical axis alignment are provided in each of the emitter and the receiver, and the collimator for optical axis alignment is provided on the receiver side. Adjust the receiver by targeting the visible light emitting element for optical axis alignment on the emitter side, and adjust the emitter using the collimator for optical axis alignment on the emitter side, aiming at the visible light emitting element for optical axis alignment on the receiver side. By adjusting the structure, the optical axis of the smoke monitoring light emitting element of the emitter and the optical axis of the smoke monitoring light emitting element of the light receiver are aligned, so that the visible light emitting element serves as the light source for optical axis alignment. Since it is permanently attached to the device, there is no need to carry a flashlight like in the past.
There is no trouble with removal, there is no need to go back and forth between the emitter and the receiver, there is no need to worry about battery consumption, and the light emitting element, the light emitting element for smoke monitoring, and the light receiving element can be easily connected to each other. Since the optical axis is always kept parallel to the light-receiving part of the standard device, highly accurate optical axis alignment is possible even though it is indirect optical axis alignment, and overall optical axis alignment is improved. The adjustment can be done easily and accurately, and since the visible light emitting element for optical axis alignment is used as a guide, the adjustment can be done even in a dark place.

[Brief explanation of drawings]

Figure 1 is an electrical circuit diagram of one embodiment of this invention, Figure 2 is a time chart, Figure 3 A is an explanatory diagram of optical axis alignment, B is an explanatory diagram of smoke monitoring, and C is a perspective view of a collimator. It is a diagram. T... Emitter, J... Receiver, L ₁ ... Infrared light emitting diode (light emitting element for smoke monitoring), L ₂ , L ₃ ...
...Visible light emitting diode (light emitting element for optical axis alignment),
PD...Infrared photodiode (light receiving element for smoke monitoring), Sw...Switch section, 4, 5...Collimator (light receiving section for optical axis alignment).

Claims (1)

[Claims for Utility Model Registration] (1) A light emitting element for smoke monitoring, a visible light emitting element for first optical axis alignment with the light emitting element and the optical axis parallel to each other, and a first collimator for optical axis alignment. a smoke monitoring light receiving element; a second visible light emitting element for optical axis alignment with respect to the first optical axis alignment collimator with the light receiving element and the optical axis parallel to each other; a light receiver having a second collimator for optical axis alignment with respect to the first visible light emitting element for optical axis alignment; and switching the first and second visible light emitting elements for optical axis alignment between operation and non-operation. A dimming type smoke monitoring device equipped with a switch part. (2) The dimming type smoke monitoring device according to claim (1), wherein the switch section is a remote control type that is integrated into one of the light projector and the light receiver.