JPH0211879B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a device for detecting various situations such as the movement of people or objects, the occurrence of a fire, the presence or absence of a heat source including people, or abnormal conditions due to violent acts in an elevator car. It is particularly effective for controlling automatic doors including elevator doors, detecting abnormalities in elevator cars, and security devices for preventing illegal entry into buildings.

Conventionally, there is no single device that can detect the various situations described above. For example, devices that detect the movement or presence of people for door control or crime prevention use photoelectric devices, electromagnetic waves, and There are some that use ultrasonic waves and others that use a load detection switch, but it is necessary to install a separate fire alarm in case of a fire. There was no proper means of detection, and they were simply equipped with an emergency button. Furthermore, the photoelectric device described above detects the presence or absence of a person by detecting the presence or absence of a person by blocking visible light and infrared rays by the human body, so the detection range is extremely limited, and it is sensitive to electromagnetic waves and infrared rays. Active detection methods using radiation such as ultrasonic waves have drawbacks such as the possibility of causing various problems such as communication problems and adverse effects on the human body.

Therefore, we focused on these points and developed a situation detection device that is non-contact and passive, so there is no risk of causing the various troubles mentioned above, and can detect a wide variety of situations as mentioned above with a single device. was filed first. (Hereinafter, this will be referred to as the invention of the earlier application.) The invention of the earlier application will be explained below based on FIGS. 1 to 5.

1 and 2 are diagrams showing the principle of the invention of the earlier application, in which 1 is a point light source existing on a certain object surface, 2 is a detection body having a plurality of partial prisms 3a to 3e, and 4 is partial prisms 3a to 3e. A lens 3e condenses the light beam 5 transmitted through the lens 3e, a detector 6 emits a signal corresponding to the condensed light beam, and 6a an output signal of the detector 6. Assuming that the detection body 2 is opaque except for the partial prisms 3a to 3e, the movement of the point light source 1 in the X direction causes the detection body 2 to have a transmission distribution of transparent and opaque light. When this light is focused on the light receiving surface of the detector 6 by the lens 4, a periodic pulse signal 7 as shown in FIG. 2 is output as an output signal 6a. By counting this pulse signal 7 and detecting the frequency, the movement of the point light source 1 can be known, and by detecting the level, the presence or absence of the point light source 1 can be known. Further, by curving the detection body 2 as shown in the figure, the detection range can be widened. Although the partial prisms 3a to 3e are arranged only in the X direction of the detection body 2, if a plurality of them are arranged on a spherical surface, detection can be made not only in the X direction but also in any direction of movement. The above is the basic principle of the invention of the prior application, and for convenience of explanation, the measurement target is a point light source, but measurement is possible even if the target is a two-dimensional spread with irregular luminance distribution.

Figures 3a and 3b show a wide solid angle prism, which is a specific example of a detection object having a plurality of partial prisms. Figure 3a is its front view, and Figure 3b is its plan view. be. As shown in the figure, the curved surface portion of the lens body is cut, and a wide solid angle prism 8 is constituted by a large number of cut surfaces 8'.

FIG. 4 is a diagram showing an example of a specific configuration of the situation detection device according to the invention of the prior application. A wide solid angle prism 8 is used as a detector having a plurality of partial prisms, and a photoelectric element 9 is used as a detector that emits a signal corresponding to the focused light. 10 is a preamplifier that amplifies the output signal 9a of the photoelectric element 9; 11;
is a determination device that determines the information content of the amplified output signal 9a.

In the above configuration, when the point light source 1 moves in the X direction, the light rays 5 are focused on the light receiving surface of the photoelectric element 9 through the cut surfaces 8a to 8e of the wide solid angle prism 8 corresponding to the X direction and the lens 4. In this case, since there is no opaque portion in the wide solid angle prism 8, a periodic signal 9a' having undulations as shown in FIG. 5 is obtained as an output signal 9a. 1' and 1'' show how the point light source 1 moves.Similarly, when a person or object moves, periodic components are included due to the brightness distribution state that exists on these surfaces, that is, the unevenness of brightness and darkness. An output signal 9a can be obtained.This obtained output signal 9a is sent to a preamplifier 10.
The signal is amplified and input to the determiner 11. Here, for example, when detecting the movement of a person or an object, the determiner 11
can be realized by constructing a frequency detector. That is, the movement of a person or object appears as a change in the frequency of the output signal 9a, which can be detected by a frequency detector. Also, this determiner 1
If 1 is configured with a frequency detector that detects only when the frequency changes more rapidly than a predetermined value, for example, when a fire occurs, a sudden movement of hot air flow occurs, and this can be detected and the fire can be stopped at an early stage. In addition, passengers usually move slowly in an elevator car, but in abnormal situations such as violent acts or children jumping, passengers can move suddenly, so this can be detected and passengers can be kept safe. can lead to a state of Further, if the determiner 11 is configured with a level detector and the level of the output signal 9a is detected when the level is above a set value or below a set value, it is possible to detect the presence or absence of a light source including a person or an object. In addition, if the wide solid angle prism 8 and lens 4 are selected to have characteristics that have low attenuation in the infrared region, and the photoelectric element 9 is selected to respond to the infrared region, the infrared rays emitted by people and other heat sources can be detected. It can detect the presence and movement of people and other heat sources even at night, and because it passively detects infrared rays emitted from heat sources such as the human body, it can also detect heat sources hidden behind shields. For example, it can be highly effective as a security device against intrusion into buildings. Furthermore, by configuring the determiner 11 by combining a frequency detector and a level detector, it becomes possible to detect various situations with a single device. It should be noted that the above-mentioned frequency detector and level detector can be easily realized using conventional technology, so their explanation will be omitted here.

The above is the explanation of the invention of the earlier application. By the way, according to the situation detection device of this prior application, detection is performed by condensing the transmitted light of a plurality of partial prisms, so in order to detect infrared rays emitted from a heat source, a wide solid angle prism and a wide solid angle prism are used as described above. It is necessary to use a lens that exhibits low attenuation in the infrared region. However, since the amount of infrared rays emitted by the human body is usually very small, germanium-doped glass or silicon-doped glass are known to have properties that can detect this, but these are very expensive and are not practical. It has the major drawback of being scarce.

The present invention has been made by focusing on the above-mentioned drawbacks.
The present invention aims to provide a situation detection device that can be realized at low cost even when detecting a minute amount of infrared rays.
In other words, the present invention uses a detection body having a plurality of reflective surfaces instead of a detection body having a plurality of partial prisms, and attempts to detect the situation by condensing the light reflected by the reflector. is the same as the invention of the earlier application. The present invention will be explained below based on the drawings.

FIG. 6 is a diagram showing an example of a specific configuration of the situation detection device according to the present invention. In the figure, the same parts as in FIGS. 1 to 5 are indicated by the same reference numerals. Reference numeral 12 denotes a detection body in which a large number of flat reflecting surfaces are arrayed vertically and horizontally on the convex side of a convex body, and is arranged with the convex side facing in the opposite direction to the field of view. The object to be detected is, for example, similar in shape to the wide solid-angle prism with multiple cut surfaces shown in Fig. 3, with a reflective surface that absorbs little infrared rays, such as an aluminum vapor-deposited film, formed on its surface. Similar to the claimed invention, the shape of the cut surface,
The number, arrangement, etc. may be arbitrarily selected depending on the measurement target (detection target). Further, the material may be any material such as glass or iron as long as aluminum vapor deposition is possible on the surface.
Furthermore, in the case of detecting only visible light, the reflective surface is not limited to an aluminum vapor-deposited film, and any material that constitutes a reflective surface may be used. Reference numeral 13 designates a condenser having a reflective surface such as an aluminum vapor deposited film on its surface, and is arranged around the detecting body 12 so that the reflective surface faces the convex side of the detecting body 12. The reflective surface of the condenser 13 is formed, for example, in a concave shape such as a paraboloid or a hyperboloid, but it can of course be formed into any shape depending on the detection range and the cut surface of the object to be detected.

In the above configuration, as the point light source 1 moves in the x direction, the light ray 5 sequentially passes through the reflecting surface of the condenser 13 and the cut surface of the plurality of cut surfaces of the detection object 12 according to the position of the point light source. The light is focused on the detector 9 through the light beam, and an output signal 9a similar to the periodic signal 9a' shown in FIG. 5 can be obtained as in the invention of the prior application. Of course, the object to be detected is not limited to a point light source, but can be a person or an object as well.If the brightness distribution state, that is, the uneven brightness (surface) existing on the surface of the object moves, the light rays corresponding to that surface will be scattered across the detection object 12. The light is sequentially focused on the detector 9 through the cut surfaces (one or more) according to the position of the cut surface, and outputs an output signal 9a that also includes a periodic component according to the moving speed of the surface. Obtainable. By analyzing this output signal 9a by the determination device 11, various situations can be detected with a single device, similar to the invention of the prior application.

As described above, the present invention sequentially reflects the distribution of brightness on the surface of a person or object, or the infrared rays emitted from a heat source such as a person, by a large number of reflective surfaces as the person or object moves. Since a periodic signal is obtained by condensing light, detection of a minute amount of infrared rays can be realized at low cost by forming the reflective surface with an aluminum vapor-deposited film, for example.

[Brief explanation of drawings]

Figures 1 to 5 are diagrams explaining the invention of the earlier application,
Figures 1 and 2 are diagrams showing the basic principle, Figure 3 is a diagram showing a wide solid angle prism, a is its front view, b
is a plan view, FIG. 4 is a diagram showing an example of a specific device configuration, FIG. 5 is a diagram showing an output signal of the photoelectric element of FIG. 4, and FIG. 6 is a diagram showing an example of a specific device configuration of the present invention. It is a diagram. 1... Point light source, 2... Detection object, 3a to 3e...
Partial prism, 4...lens, 5...ray, 6...
...Detector, 8...Wide solid angle prism, 9...Photoelectric element, 6a, 9a...Output signal, 11...Determination device, 12...Detection object, 13...Concentrator.

Claims (1)

[Claims] 1. A detection body in which a large number of flat reflecting surfaces are arranged vertically and horizontally on the convex side of a convex body, with the convex side facing in the opposite direction to the field of view, and having a concave reflecting surface, the reflecting surface a condenser disposed around the detecting object such that it faces the convex side of the detecting object; A detector that emits an output signal corresponding to the light beam (or infrared rays) focused through a reflective surface depending on the position of the object, and the situation within the field of view is determined based on the frequency or output level of the output signal of the detector. A situation detection device comprising a determination device for determining the situation.