JPS6245153B2 - - 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. Additionally, a method has been proposed in which a noise calculation device is installed inside the car to detect when abnormally loud noises such as screams and cries are emitted, but this does not mean that the victim will always make a loud noise. Also, when the background noise inside the car changes suddenly,
There are problems such as erroneous detection 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.

By the way, in order to solve these various problems, the applicant has filed, for example, Japanese Patent Application No. 55-178524 "Abnormality Detection Device in Elevator Car", Japanese Patent Application No. 56-10997 "Situation Detection Device", or Japanese Patent Application No. 56-214083. We are proposing a device that detects abnormalities inside an elevator car and various other situations by capturing changes in spatial brightness distribution and infrared rays emitted from heat sources such as human bodies, such as the "Elevator Car Abnormality Detection Device." . FIG. 1 shows an example of a conventional configuration of a device for detecting an abnormality in an elevator car by detecting changes in the spatial distribution of brightness. 1 is a device that detects changes in luminance spatial distribution and outputs a signal 1a corresponding to the change;
For example, from a detection object such as a wide solid angle prism (not shown), a condensing device such as a condensing lens (not shown), and a detector such as a photoelectric conversion element that converts the focused light beam into an electrical signal (not shown). Become. Of course, the present invention is not limited to this configuration, and the same effect may be obtained by using, for example, a large number of partial prisms or holes arranged on a curved surface as the detection object. 2 is a preamplifier that amplifies the signal 1a to the required level and outputs it as signal 2a; 3 is a preamplifier that removes unnecessary components such as low-pass components contained in signal 2a and components caused by AC lighting; signal 3
A band filter 4 outputs the input signal 3a, and 4 is a determination device composed of, for example, a frequency comparison circuit.
When the frequency exceeds a predetermined value, an abnormality detection signal 4a is generated.

In the above configuration, the details are omitted as they are described in the earlier application mentioned above, but we focused on the fact that the movement of passengers is generally slow in the elevator car under normal conditions. When the person moves or moves part of his or her limbs, a signal 1a containing a frequency component proportional to the speed of movement is obtained. When the frequency exceeds a predetermined value, that is, when the passenger's movement is faster than normal, it is assumed that an abnormality has occurred, and an abnormality detection signal 4a is issued to stop the elevator at the nearest floor or notify the manager's office. The purpose is to prevent crimes, children's mischief, etc., and ensure the safety of passengers.

By the way, in the above configuration, conventionally, the determination device is configured with a frequency comparison circuit, and the frequency is determined based on the time of a half cycle of the signal according to the change in the luminance spatial distribution, and when the value exceeds a predetermined value, an abnormality detection signal is issued. For example, instantaneous movements such as when a passenger looks at their watch, or noise can cause an abnormality detection signal to be emitted, resulting in unnecessary alarms being emitted or elevators being shut down. There are problems with reliability, such as unnecessary stoppages.

The present application has been made in view of these points, and an object thereof is to provide a more reliable elevator car abnormality detection device that reduces malfunctions as much as possible.

The feature of the present invention is that instead of detecting the frequency from the time of a half cycle of the input signal to determine an abnormality, it generates a pulse every half cycle of the input signal and converts the input signal into a pulse signal. By counting the number of pulses within a predetermined time from this pulse signal, it is possible to make decisions that take into account not only the speed of change in the brightness spatial distribution, but also its duration, and to detect changes caused by instantaneous changes in the object, noise, etc. The point is that the influence has been removed.

The present invention will be explained below with reference to the drawings. FIG. 2 shows an embodiment of the determination device according to the present invention.
It constitutes a pulse number detection circuit. Figure 3 is the second
FIG. 2 is an explanatory diagram showing waveforms at each point in the figure.

In the figure, 10 is a window comparator, C and R
Each constitutes a differentiating circuit with a capacitor and a resistor. I1 and I2 are for performing waveform shaping with a pair of inverters. A preset counter 11 counts down the number of pulses input to the clock terminal P1, and when the content reaches zero within a set time, a pulse signal is output from the carry out terminal P4, and at the same time, the monostable multivibrator 12 is also reset. Ru. This setting time is set by the monostable multivibrator 12,
If the content of the counter does not become zero within the set time, it is preset by the preset terminal P2 via the inverter I3. P3 is a preset input terminal, and PS is a preset input switch, which corresponds to the number of set pulses of 1, 2, 4, and 8, respectively.Here, only the switch corresponding to 4 is closed, An example is shown in which a pulse signal is generated from the carry-out terminal P4 when the number of pulses input to the clock terminal P1 is four within a set time. Q1, Q2, Q3 are the trigger terminals of the monostable multivibrator 12, respectively.
Output terminal and reset terminal are shown. The waveforms at each point of the input signal 3a and A1 to A5 are as shown in FIG.

Assume that a signal 3a as shown in FIG. 3 is obtained in response to the movement of passengers in an elevator car.
Here, 3a' is a portion corresponding to an instantaneous movement or noise of a passenger, and 3a'' is a portion corresponding to a relatively continuous movement such as a violent act.The threshold level of the window comparator 10 (as required) If the waveform at point A1 is as shown in the dotted line in Fig. 3, the waveform at point A1 will be as shown in Fig. 3, and the pulse will be generated by a differentiating circuit consisting of a capacitor C and a resistor R, and a waveform shaping circuit of inverters I1 and I2. It is converted into a signal and has the waveform shown in A3 in FIG. 3. When this pulse signal is input to the clock terminal P1 of the preset counter 11 and the trigger terminal Q1 of the monostable multivibrator 12,
The monostable multivibrator operates for a set time t, during which time the preset counter 11 counts down the number of pulses. In Fig. 3, the number of pulses corresponding to signal 3a' is 2, so the set time t
The contents of the preset counter 11 do not become zero during this period, so no pulse signal is output from the carry-out terminal P4, that is, no abnormality detection signal is output, and the elevator continues to operate normally. Further, at the end of the set time t, the preset counter 11 is preset via the inverter I3. Thereafter, when a pulse signal corresponding to the signal 3a'' is input to the clock terminal P1, the preset counter 11 starts counting down again, and this time the count reaches zero within the set time t, and at that point a pulse signal is output from the carry out terminal P4. is output as an abnormality detection signal 4a, and the monostable multivibrator 12 is reset.Then, as described above, this abnormality detection signal 4a is used to stop the elevator at the nearest floor, issue an alarm, or notify the manager's office. Passenger safety can be ensured at an early stage.

As described above, according to the present invention, a signal corresponding to a change in luminance spatial distribution is converted into a pulse signal every half cycle of the signal, and the number of pulses within a predetermined time is detected from the pulse signal, thereby simply changing the frequency. Since we have made it possible to take into account not only the high level of noise, but also the duration, it is possible to prevent malfunctions caused by instantaneous movements of passengers or noise, providing an even more reliable abnormality detection device in the elevator car. can do.

In the above explanation, the determination device is composed of only a pulse number detection circuit, but it is also possible to use an AND with a frequency comparison circuit.
It is also possible to perform even more accurate determination by configuring it with a circuit and setting the set frequencies of both appropriately.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of an elevator car abnormality detection device, FIG. 2 is a diagram showing an example of the determination device according to the present invention, and FIG. 3 is a waveform at each point in FIG. 2. FIG. DESCRIPTION OF SYMBOLS 1... A device that detects a change in luminance spatial distribution and outputs a signal corresponding to the change, 2... Preamplifier, 3... Band filter, 4... Judgment device, 4a... Abnormality detection signal,
10... Window comparator, 11... Preset counter, 12... Monostable multivibrator,
I1-I3...Inverter, C...Capacitor, R...
resistance.

Claims (1)

[Scope of Claims] 1. A device comprising: a device that detects a change in the luminance spatial distribution within a detection range and outputs a signal corresponding to the change; and a determination device that determines the content of the signal according to the change in the luminance spatial distribution; In the device for detecting an abnormality in an elevator car, the determination device includes a circuit that converts a signal corresponding to the change in the luminance spatial distribution into a pulse signal by generating a pulse every half cycle of the signal; An elevator car abnormality detection device comprising a circuit that detects the number of pulses of the pulse signal within a predetermined time and outputs an abnormality detection signal when the number of pulses within the predetermined time exceeds a predetermined number. .