JPS5830637B2 - distributed smoke detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a plurality of transmitted-light type smoke detectors each consisting of a pair of emitters and a light receiver, and arranges them in a matrix so that the light beams are orthogonal to each other, and detects smoke at each grid point. A distributed smoke detector characterized in that the presence or absence of smoke is determined by the AND operation of two orthogonal detectors passing through that point, and the state of smoke is displayed in a pattern on a display panel on the receiver side. The purpose of this system is to determine the position and spread of smoke at a monitoring location based on patterns.

Conventional smoke detectors are equipped with a pair of light emitter and light receiver, and smoke existing between them is monitored in a linear manner by attenuation of light.

Therefore, the location of the smoke was not known, and it was not possible to distinguish between cases where thin smoke was widely distributed and cases where there was thick smoke in some areas.

The present invention has been made in view of this point, and will be explained in detail below with reference to Examples.

In the figure, 1m1 to 1mi and inl to lnj are projectors, and receivers 2ml to 2mi and 2n1 to 2nj are arranged to face these projectors, respectively, so that the light beams are orthogonal to each other at the monitoring location A. Arrange.

3m1 to 3mi and 3n1 to 3nj are signal processing and judgment circuits, II OI with output, II OI with no output.
Becomes I.

4m1 to 4mi are inverting circuits.

B is the receiver side display panel, with light emitting diodes 511 to 5ij
Place them as shown.

Now, if there is smoke in the shaded area of the monitoring location, the floodlight I n2
The sensor of the light receiver 2n2, the emitter 1m2, and the light receiver 2m2 operate, and the inverting circuit 4m2 outputs an output "'1", and the signal processing and determination circuit 3n2 outputs an output II OII. Get out.

Therefore, the light emitting diode 522 on the receiver side display panel B
lights up and you can see the pattern of the smoke location.

Note that it is not necessary to provide a plurality of light sources, and the light may be sent from one light source to a plurality of projectors using an optical fiber.

As described above, the present invention uses a plurality of transmitted light type smoke detectors each consisting of a pair of emitters and a light receiver, and arranges them in a matrix so that the light beams are perpendicular to each other, and detects the presence or absence at each grid point. This is determined by the AND operation of two orthogonal detectors that pass through that point, and the state of the smoke is displayed in a pattern on the display panel on the receiver side, so the position of the smoke and how it is dispersing can be seen at a glance. Since the system does not operate unless a floating object such as lattice point is present, it has the effect of extremely reducing malfunctions.

[Brief explanation of the drawing]

The figure is a block circuit diagram of an embodiment of the distributed smoke detector of the present invention. 1m1~1mi...Floodlight, In1~lnj・
...Emitter, 2m1-2mi...Receiver, 2n1-2nj...Receiver, B...Receiver side display panel.

Claims (1)

[Claims] A plurality of transmitted-light smoke detectors each consisting of a pair of emitters and receivers are arranged in a matrix so that the light beams are orthogonal to each other, and the presence or absence of smoke at each grid point is determined by the orthogonal detection that passes through that point. This distributed type smoke detector is characterized in that the state of smoke is displayed in a pattern on a display panel on the receiver side by making a discrimination based on the AND operation of two detectors.