JPS6214468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection device in an elevator car, and particularly provides a device that is effective in detecting abnormalities such as acts of violence, children's mischief, and fire.

Conventionally, there has been no appropriate means for preventing criminal acts such as violence inside an elevator car, and the only thing that has been done is to simply provide an emergency button inside the car. However, in such cases, victims are not always able to press the emergency button, and this is insufficient to prevent such violent acts. Furthermore, if a child were to run around or jump around inside the car, the governor rope switch would activate and make an emergency stop, which could lead to a situation where the car would become stuck. Various other abnormalities within the car can be considered, such as fire, but in any case, it has not been possible to find a single device capable of detecting various abnormal conditions within the car.

The present invention detects various abnormal conditions within the elevator car using a single device, by measuring changes in the spatial distribution of luminance within the car. In other words, under normal conditions, passengers generally move slowly in an elevator car, and therefore the spatial distribution of brightness within the car also changes slowly. This method was developed based on the fact that the brightness spatial distribution inside the car changes rapidly due to movement or fire, and a spatial filter is used to measure changes in the brightness spatial distribution.

Here, the spatial filter generally refers to a filter that realizes the function performed by a slit array. For example, the basic principle of a distance/velocity sensor as an example is shown in FIGS. 1 to 3. Figure 1 shows the case where an optical system with a spatial filter effect is installed facing downward.If a point light source 1 exists on an object plane located below and a distance H from the system, its image will be reflected by the objective lens. An image is formed on the image plane located at a position from 2 to F. An example of the slit plate R placed in this image plane is shown in detail in Figure 2. Length x Width = B
xa rectangular slits are arranged in the Y direction at intervals of a, and this is called a fence-like reticle. This provides a periodic transmission distribution of transparent and opaque light with an interval a in the Y direction within the image plane, and the transmitted light transmitted through this reticle is transmitted to the light receiving surface of the detector 5 by the condenser lens 4. The light is focused on. Now the system is parallel to the object surface with a constant velocity of V,
For example, if we consider that the point image continues to move in the Y direction, the point image will scan the reticle surface, and the output 6 of the detector 5 will be a periodic pulse signal of a rectangular wave as shown in FIG. The period T seconds is given by T=2aH/FV (1). In equation (1), since a and F are known, the period T of the output waveform of the detector 5 is measured. In this case, if H is known, the speed V can be measured, and if V is known, the distance H can be measured. can be measured.
The above is the basic principle of a spatial filter as a distance/velocity sensor, but the measurement target is not limited to a point light source, but can also be used to measure two-dimensional spreads with irregular brightness spatial distributions such as the earth or sea surface. is possible.

The present invention makes use of this spatial filter, and by attaching it to an appropriate position in the car, it extracts a frequency output that corresponds to the movement of passengers in the car, and then uses a frequency determiner to determine the frequency. If this value is exceeded, it is assumed that some kind of abnormality has occurred within the car, and the system attempts to ensure passenger safety by issuing an alarm or stopping the car at the nearest floor.

The present invention will be explained below based on the embodiments shown in FIGS. 4 and 5.

FIG. 4 is a sectional view of the elevator car, where 7 is the car, 8 is the main rope, 3 is the spatial filter consisting of the aforementioned slit plate, sensing element, lens, etc., and 9 is the spatial filter.
The shaded area indicates the detection range of the spatial filter. Here, the mounting device for the spatial filter 3 is not limited to the top of the car as in the embodiment shown in FIG. 4, but may be placed anywhere, even on the side of the car, as long as the inside of the car can be detected. Further, the detection range 9 can be freely set by designing the optical system. In addition, as the spatial filter 3, the fence-like reticle explained in Figs.
Although it is not possible to detect objects moving in the same direction, this problem can be solved by using a grid reticle or by providing a plurality of fence reticle. Furthermore, as the spatial filter 3, any filter can be used as long as it realizes the function generally performed by a slit array, such as one in which the slit array is constructed using solar cells, or one in which two sets of slit arrays are configured in a differential configuration. can. FIG. 5 is a diagram showing an embodiment of the circuit configuration of the in-car abnormality detection device according to the present invention, in which 3 is a spatial filter, 3a is the output of the spatial filter 3, and 10 is a diagram when the output frequency of 3a exceeds a predetermined value. This can be easily realized using a well-known technique using a frequency determiner that generates an output 10a. That is, the output (analog signal) of the spatial filter 3 may be converted into a pulse signal by a window comparator and waveform shaping, and an output may be generated when the time interval of this pulse is equal to or less than a predetermined value. Furthermore, at this time,
For example, if you count the number of pulses within a certain period of time and issue an output when that value is greater than or equal to a predetermined value (this will take the element of duration into account), and then take the AND of both outputs, you can generate an output instantly. This eliminates the effects of mechanical changes and noise, making it possible to further improve accuracy. Although not shown, it is desirable to insert a bandpass filter between the spatial filter 3 and the frequency determiner 10 in order to remove noise caused by AC lighting. Reference numeral 11 indicates various safety devices activated by the output 10a of the frequency determiner 10. Here, the safety devices are, for example, alarm devices, devices that display abnormalities inside the car, broadcasting devices, devices that notify the manager, equipment that stops the nearest floor, etc., that notify people outside the car of abnormalities inside the car, or This is a device that guides passengers inside the car to a safe state.

In the above configuration, if the predetermined value of the frequency determiner is set slightly higher than the frequency of the output 3a of the spatial filter 3 due to the slow movement of passengers in the car, the frequency The elevator continues to operate normally without generating the output 10a of the determiner 10, but if there is a splash caused by violence or a child's mischief in the car, or if there is a sudden movement of smoke or hot air due to a fire, the space may become unstable. When the frequency of the output 3a of the filter 3 exceeds a predetermined value and the frequency determiner 10 emits the output 10a, a safety device such as an alarm device is activated, and passengers can be quickly guided to a safe state. It is.

As described above, the present invention uses a spatial filter to detect various abnormal conditions within the car with a single device, and is highly effective in protecting and safety of passengers.

[Brief explanation of the drawing]

1 to 3 are diagrams showing the principle of a spatial filter. Figure 4 is a sectional view of the basket. FIG. 5 is a diagram showing an embodiment of the circuit configuration according to the present invention. 3...Spatial filter, 7...Cage, 9...Detection range,
10...Frequency determiner, 11...Safety device.

Claims (1)

[Claims] 1. The elevator car is provided with a spatial filter that detects changes in the spatial distribution of luminance within the car, and a frequency determiner that detects the output frequency of the spatial filter, and the frequency determiner is configured to detect the output frequency of the spatial filter at a predetermined level. An abnormality detection device in an elevator car, which is characterized by activating various safety devices when a value exceeds a value.