JPS584789B2 - Jintai Kenchi Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a human body detection device used to detect the presence of a person in a store, for example.

In the conventional human body detection device, as shown in FIG. A light receiving element 3 made of a photoelectric element is provided, and its output is sent to a change detection circuit 5 via an amplifier circuit 4.
The output from the detection circuit 5 causes a detection signal to be generated in the output circuit 6.

That is, this device has a detection area (
Shown with diagonal lines.

) is in a normal state, the object in the area is stationary, so the amount of light received by the light receiving element 3 is constant and does not change, so no detection signal is generated. However, when a human body etc. enters the detection area, it causes light to be emitted. Reflection occurs and the amount of received light changes, thereby generating a detection signal.

However, such detection devices have the disadvantage that detection signals may be generated by insects, falling objects, or other objects passing through the detection area, or by lightning, flashes from photography, or other optical noises, resulting in malfunctions. be.

The present invention eliminates the above-mentioned drawbacks, provides a human body detection device that reliably detects only the human body, and has no risk of malfunction.

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 2 and 3, the light emitting circuit 1 and the light emitting element 2 project light onto an area P as in the conventional case, and each of the four areas DA to DD within the area P is Four light-receiving elements 3A to serve as light-receiving areas
Provide 3D.

Here, in the four areas DA-DD, the first area DA is the second area DB, and the third area DC is the fourth area DD.
are spaced apart from each other in the horizontal direction, and the first area DA is spaced from the third area DC and the second area DB is spaced from the fourth area DD in the vertical direction.

That is, these four areas DA to DD are located at the vertices of a rectangle whose two adjacent sides are horizontal and vertical in a vertical plane, as shown in FIG.

Further, the horizontal separation distance between these regions is set to be slightly smaller than the width of the human body M, and the vertical separation distance is set to be smaller than the length of the torso of the human body M.

The light receiving elements 38 to 3D are provided with amplifier circuits 4A to 4A, respectively.
4D and the output circuit 6 via the change detection circuits 5A to 5D.
A to 6D are connected, and the outputs of output circuits 6A and 6C are simultaneously generated in these output circuits 6A to 6D, and after a certain period of time, the outputs of output circuits 6B and 6D are simultaneously generated, and these four outputs are simultaneously generated. An output processing circuit 7 is connected to output a detection signal when a detection signal occurs, and the fixed time is configured to be a time corresponding to the moving speed of the person in relation to the separation between the areas DA and DB.

Note that 8 indicates a light emitting section, and 9 indicates a light receiving section.

Since the present invention has the above-described configuration, the detection signal is output from the output processing circuit 7 only when a person passes through the area P.

In other words, when a leaf or the like falls through area P, it may pass through horizontally spaced areas DA and DB or Dc and DD at the same time, but it may pass through vertically spaced areas DA and DC or DB and DD at the same time. Therefore, since the outputs of the output circuits 6A and 6C are not generated simultaneously, no detection signal is output.

Furthermore, when insects or other small objects fly around within the area P, they will not be present in two or more of the four areas DA to DD at the same time, so no detection signal will be output.

Furthermore, when there is optical noise such as lightning or flashes from photography,
Output circuit 6 due to damping etc. of each amplifier circuit 4A to 4D.
Outputs are generated at A to 6D, but since all four outputs are generated simultaneously, the output processing circuit 7 does not output a detection signal at this time either.

However, when a person passes through area P, he enters vertically spaced areas, such as DA and DC, and then passes through four areas D.
After entering all of A-DD, the front areas DA and D
C, and finally areas DB and DD.

Therefore, as shown in FIG. 5, outputs SA and So that continue for a certain period of time are generated in the output circuits 6A and 6C, and after a certain period of time has passed since the generation of these outputs SA and sc, both outputs SA,
Before Sc disappears, similar outputs SB and SD are generated in the output circuits 6B and 6D, and the four outputs overlap in time, and moreover, during the certain period of time, areas DA and DB are separated in the horizontal direction.
The output processing circuit 7 outputs the detection signal S because it corresponds to the distance between the two and the moving speed of the person.

Furthermore, it can be assumed that such a series of states occurs only when a person is involved, so that the device of the present invention detects only the human body, and there is virtually no risk of malfunction.

According to the present invention, it is also possible to detect the direction of movement of a person by determining which of the output circuits 6A and 60, 6B and 6D associated with a set of vertically spaced areas produces an output first.

FIG. 6 shows an example of the configuration of the output processing circuit 7, where a to d are input terminals connected to the output circuits 6A to 6D, respectively, DC is a differentiation circuit, and T is a timer, which is a differentiation circuit D provided in front.
NG is a NAND gate, and {circle around (2)} is an inverter.A reset input by a positive pulse from C generates an output after a certain period of time has elapsed, and is reset by a set input by a negative pulse.NG is a NAND gate, and {circle around (2)} is an inverter.

The present invention has been described above in detail with respect to the embodiment of the light reflection method.
Of course, the present invention can also be applied to a facing method, that is, a method in which a light emitter and a light receiver are opposed to each other.

FIG. 1 is a diagram similar to FIG. 3 in that case.

As described above, according to the human body detection device of the present invention, a detection signal can be generated in relation to the size and moving speed of the human body with an extremely simple configuration, and it is possible to generate a detection signal in relation to the size and moving speed of the human body. There is no risk of malfunction, and therefore there are significant benefits such as greatly improved reliability.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional human body detection device, FIGS. 2 to 4 are explanatory diagrams of the human body detection device of the present invention, FIG. 5 is an output diagram for explaining the operation of the present invention device, and FIG. 6 is an illustration of the present invention. FIG. 7, which is a circuit diagram of an example of the output processing circuit used in the invention, is an explanatory diagram when the invention is applied to a facing system. 1... Light emitting circuit, 2... Light emitting element, 3
......Photodetector, 4...Amplification circuit, 5.
...Change detection circuit, 6...Output circuit,
7... Output processing circuit, 8... Light emitting section,
9... Light receiving part, M... Human body, DC...
... Differential circuit, T ... Timer, NG ...
...NAND gate, ■...Inverter.

Claims (1)

[Claims] 1. Detecting changes in the state of light in first and second regions that are spaced apart from each other in the horizontal direction, and in third and fourth regions that are spaced apart from these regions in the vertical direction and from each other in the horizontal direction. After a certain period of time has elapsed since the outputs of the first to fourth photodetection mechanisms and the first and third photodetection mechanisms occur simultaneously, the outputs of the second and fourth photodetection mechanisms occur simultaneously, and - an output processing mechanism that generates a detection signal when the outputs of the fourth photodetection mechanism overlap in time; and the distance between the first and second regions and the distance between the first and third regions. A human body detection device characterized in that the separation distance between the two is smaller than the size of the human body in each corresponding direction.