JPS6353110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting abnormalities in an elevator car, and provides a device that is particularly effective in detecting abnormalities such as violent acts by passengers, mischief by children jumping up and down, and fires.

Traditionally, crime prevention and disaster prevention devices in elevator cars include telephone devices and emergency buttons, but victims are not always able to operate these in the event of an act of violence. Moreover, it cannot be detected if it is a child's prank or the like. One possible countermeasure for these problems is to keep the communication device working all the time, but in this case, the manager needs to always pay attention to the conversations inside the car.
There is also a method of installing a TV camera inside the car, but this is expensive and requires monitoring the TV all day long, and it also involves privacy issues and makes passengers feel uncomfortable. There is also the problem that the design inside the basket creates a sense of discomfort. In addition, a method has been proposed in which a sound level meter and a noise calculation device are installed inside the car to detect abnormally loud noises such as screams and screams, but the problem is that the victim always makes a loud noise. However, there are problems such as false detection when the background noise inside the car changes suddenly, or when there is loud talking or laughter. In addition, a security switch is installed inside the car, and when a passenger gets into the car and feels uneasy, they operate this switch, and if the switch is not returned to its original position after a predetermined period of time, an alarm will be issued. Although there is a method to do this, there are various problems such as when the switch is turned off midway or when the operator forgets to operate it.

The present invention was devised to solve the various problems associated with the conventional methods, and detects abnormal conditions by capturing changes in the spatial distribution of luminance within the elevator car.

In other words, the movement of passengers in an elevator car is generally slow during normal times, and therefore the unevenness of light on the surface of people and objects does not change much, but when a crime such as a violent act occurs,
When a child runs around or jumps around, or when a fire occurs, the unevenness of light on the surface of an object changes rapidly, and this can be detected to detect abnormal conditions.

The present invention will be explained below based on the drawings. 1 to 3 are diagrams showing the basic principle of the present invention, in which 1 is a point light source, 1a is a light beam emitted from the point light source 1, and 2 is a detection having a plurality of holes 2a to 2e arranged at a pitch P. 3 is a condensing lens, and 4 is a detector that emits a signal 4a in response to the condensed light beam 1a, and uses, for example, a photoelectric conversion element.

Assuming that the detection body 2 is an opaque material and the point light source 1 moves in the X direction at a speed V, the light ray 1a passes sequentially through the holes 2a to 2e and is focused onto the detector 4 by the condensing lens 3, and as a result, A periodic pulse signal 5 as shown in FIG. 2 can be obtained as the signal 4a. Since the period T of the pulse signal 5 is P/V, it becomes a signal of V/P when converted into frequency. Therefore, since the frequency is proportional to the moving speed V, the point light source 1
The faster the signal 4a moves, the higher the frequency of the signal 4a becomes. Further, the amplitude A of the pulse signal 5 at this time is proportional to the intensity of the light from the point light source 1.

For convenience of explanation, the target is a point light source in the above description, but the same applies even if the target is an object with an irregular luminance distribution. In this case, it is considered that a large number of point light sources with various light intensities are randomly arranged and are simultaneously moved in parallel in a fixed direction without changing their mutual positional relationship. Therefore, the total amount of light intensity after passing through the hole array is the sum of all the signals obtained from the individual point light sources. In this case, each point light source is moving in parallel at the same speed, so it gives a signal with the same pulse frequency, but because the locations are different, the times at which it crosses each hole are different, resulting in signals with different phases. . Since the amplitude is proportional to the light intensity of each point light source, when these signals are additively combined, a narrow band irregular signal with an average frequency of V/P and whose phase and amplitude vary slowly and irregularly is obtained. The output spectrum of this signal consists of a low-pass characteristic and a band-pass characteristic as shown in Figure 3, where the center frequency is o and the number of holes in the detection object is N. Assume that the entire luminous flux is all focused on the detector light receiving surface by the condenser lens).
By removing low-pass components that are inconvenient for detection using an electric filter and analyzing the frequency and amplitude of the band-pass components, it is possible to determine the magnitude of the object's moving speed and the strength of its brightness.

Note that in Figures 1 to 3, the case where the hole rows of the detection object are arranged only in the An output signal having characteristics similar to those described above can also be obtained.

FIG. 4 is a diagram showing an embodiment of the configuration of the present invention. Reference numeral 6 denotes a detection body having a large number of holes 6a arranged vertically and horizontally on the entire surface of a curved surface, 10 a preamplifier for amplifying the signal 4a to a required level, and 11 a component resulting from low-pass components and AC lighting. A bandpass filter 12 is a determination device that removes unnecessary components such as, for example, a frequency comparison circuit, and generates an abnormality detection signal 13 when the frequency of the input signal exceeds a predetermined value. FIG. 5 is a diagram showing a state in which the in-cage abnormality detection device according to the present invention is installed. Here, only the detection body 6 is shown mounted on the car, and illustration of other devices is omitted. 20 is the elevator car, 21 is the main rope, 22 is the passenger,
The shaded area 23 is the detection range.

With the above configuration, when the passenger 22 in the car 20 moves or moves part of his or her limbs, the unevenness of light, that is, the brightness distribution existing on the surface of the passenger 22 moves accordingly, and as a result, the above-mentioned principle As explained above, the signal 4a containing frequency components corresponding to the movement of the passenger is obtained as the output of the detector 4. This signal 4a is judged by a judgment device 12 via a preamplifier 10 and a bandpass filter 11, and an abnormality detection signal 13 is generated when it contains a higher frequency component compared to normal times. This abnormality detection signal 13 can be used to stop the car at the nearest floor, generate an alarm, or notify the manager, thereby preventing abnormal situations such as violent acts and ensuring the safety of passengers. .

If the determination device is configured with an amplitude comparison circuit, it is possible to detect changes in brightness intensity, that is, abnormal conditions such as failure of lighting equipment or the occurrence of a fire.Furthermore, if it is combined with a frequency comparison circuit, it is possible to detect many types of abnormalities. Along with this detection, flames and smoke produce fluctuations made up of unique frequency components, making detection even more accurate.

As described above, the present invention captures changes in the brightness distribution state existing on the surface of a person or object.
Since it is a method that can detect various abnormal conditions inside the elevator car, it is non-contact and passive, and there is no risk of harm to the human body or radio wave pollution, making it extremely effective as a crime prevention and disaster prevention system for elevators.

In addition, we used an opaque material with many holes arranged vertically and horizontally on its entire surface as a detection object, so it is possible to detect movement not only in a specific direction but also in any direction. Since it can be anything, it can be constructed at low cost.

In addition, in the above explanation, the detection object is not limited to the one shown in FIG. 4, but various types can be considered, and not only the material can be selected as described above, but also the shape and number of holes can be arbitrary. Of course, the shape is not limited to a curved surface, but may be a planar shape. Further, the mounting position may be at the top of the car, and is not limited to the top of the car as in the embodiment.

Furthermore, although the light rays that have passed through the hole are condensed by the condenser lens, the condenser is not limited to this, and a reflecting mirror may be used to condense the light.

[Brief explanation of the drawing]

1 to 3 are diagrams showing the basic principle of the present invention,
FIG. 4 is a diagram showing an embodiment of the configuration of the present invention, and FIG.
The figure shows a state in which the device according to the present invention is attached to a car. 1... Point light source, 2, 6... Detection object, 2a to 2e, 6
a... Hole, 3... Condensing lens, 4... Detector, 10... Preamplifier, 11... Bandpass filter, 12... Judgment device.

Claims (1)

[Claims] 1. A detection body provided at the top of an elevator car, with a large number of holes arranged vertically and horizontally on the entire surface of a flat or curved opaque material, and a condenser that focuses the light rays inside the car that have passed through the holes of the detection body. , a detector that emits an output signal in response to the light beam focused by the condenser, and a determination device that outputs an abnormality detection signal when the frequency or amplitude of the output signal of the detector exceeds a predetermined value. An elevator car abnormality detection device characterized by: