JPH09175761A - Device for detecting person standing in front of elevator door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect persons near an elevator door rapidly and accurately even if the door is not touched. SOLUTION: A device for detecting person standing in front of an elevator door is provided with a heat detecting element group 4a formed with multiple pyroelectric type thin film heat detecting elements (hereafter referred to as heat detecting elements), an infrared ray transmitting lens, and a control part which controls the opening and closing of an elevator door 2 using an output signal produced by the infrared ray injected into the heat detecting element group 4a through the infrared ray transmitting lens. Also the heat detecting element group 4a is provided on the upper part of an elevator cage 1, and the injection field of view of the infrared ray into the heat detecting element group 4a is located near the elevator door 2 when the elevator door 2 is opened. In addition, each heat detecting element of the heat detecting element group 4a is provided at different field of view so as to detect persons near the elevator door 2 more extensively and securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a person detection device for an elevator door using a pyroelectric thin film heat detecting element.

[0002]

2. Description of the Related Art Conventionally, a torque limiter system has been used for detecting a person in an elevator door section by detecting a person by applying a torque of a certain level or more to a door drive section. Although common, in order to improve the detection accuracy, as shown in FIG.
The photoelectric tube 103 is provided on both sides of the elevator door 102 side of No. 1, and the photoelectric tube method for detecting a person by blocking the light (band-shaped oblique line) of the photoelectric tube 103 and the ultrasonic method for detecting a person by reflection of ultrasonic waves are also used. It had been.

[0003]

However, in the configuration of the conventional human detection device described above, when a person contacts the elevator door 102 in the torque limiter system,
In terms of safety, it was not always a good method. Also, in the photocell system, there are blind spots,
There is a problem that it is difficult to align the luminous tube 103a and the photodetector tube 103b when the photoelectric tube 103 is attached.
Further, the ultrasonic method has a problem that the price becomes high.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a human detection device for an elevator door which can reduce false detection of a human without contact.

[0005]

A heat detecting element group composed of a plurality of pyroelectric thin film heat detecting elements (hereinafter referred to as heat detecting elements) that reacts when infrared rays are incident is used in a human detecting device. Is provided in the upper part of the elevator car, and when the elevator door is opened, the field of view of the infrared rays incident on the heat detection elements is arranged so as to be wide near the elevator door. As long as a person is near the door of the elevator, the multiple heat detection elements provided on the top of the elevator car reliably detect infrared rays from the person, and this output signal allows the elevator door to open and close safely without malfunction. it can.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a heat detecting element group formed by collecting a plurality of heat detecting elements,
An infrared transmitting lens, and a control unit for controlling the opening and closing of the elevator door by an output signal generated by infrared rays incident on the heat detection element group through the infrared transmitting lens,
The heat detection element group is provided on the upper part of the elevator car,
When the elevator door is opened, the field of view of infrared rays incident on the heat detection element group is in the vicinity of the elevator door, whereby a person in the vicinity of the elevator door can be detected in a non-contact manner, as in the conventional case. It can detect swiftly and reliably regardless of the degree of contact with a person's door or the occurrence of a blind spot.

According to a second aspect of the present invention, the heat detecting element group is such that each heat detecting element has a different viewing angle in a substantially one-dimensional space, whereby an elevator door is provided. A wider range of people can be detected in the vicinity.

According to a third aspect of the present invention, a chopper for opening and closing an incident passage to the infrared heat detecting element group in the first aspect of the invention and a chopper temperature detecting means for detecting the temperature of the chopper are provided. Is provided, and the control unit is configured to control the opening and closing of the elevator doors by adding a signal from the chopper temperature detecting means, whereby a signal from the heat detecting element group and a signal of the chopper temperature are provided. By making a comparison, it is possible to more accurately detect a person even if there is a change in the ambient temperature near the elevator door.

[0009]

EXAMPLES Specific examples of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the elevator car 1 has a human detection device 3 on the ceiling of the elevator door 2 side. And the elevator car 1 stops and the elevator door 2
When the door is opened, a heat detecting element group 4a composed of a plurality of pyroelectric type thin film heat detecting elements (heat detecting elements) provided in the lower part of the human detecting device 3 for detecting infrared rays is provided near the elevator door 2 as shown in FIG. Infrared rays emitted from a person are made to enter in the visual field range shown by the dotted diagonal line.

FIG. 2 is a block diagram of an embodiment of the human detecting device 3 described above. That is, in front of the heat detecting element 4, for example, a silicon filter made of silicon resin that transmits infrared rays 5, a chopper 6 that opens and closes an entrance passage of the infrared rays to the heat detecting element 4, and transmits and collects infrared rays, for example, polyethylene. An infrared transmitting lens 7 such as a Fresnel lens made of resin is arranged in order, and a control unit 8 that inputs and processes an output signal from the heat detecting element 4 and an elevator that drives the elevator door 2 by the output signal of the control unit 8 It has a door control unit 9. Further, the chopper 6 has a chopper temperature detecting means 10, and a signal from the chopper temperature detecting means 10 is applied to the control section 8 to control opening / closing of the elevator door 2. An amplifier 8a for amplifying the signal of the heat detecting element 4, a comparator 8b for inputting and comparing signals from the amplifier 8a and the chopper temperature detecting means 10 to the control unit 8,
It has a sensitivity selector switch 8c for switching the sensitivity of the comparator 8b, a timer 8d for measuring and outputting the input time from the comparator 8b, and an output transistor 8e for turning on / off the output relay 8f by a signal from the timer 8d. Further, 8 g is a photocoupler for insulating the heat detecting element 4.

In the above structure, the infrared rays pass from the silicon filter 5 through the chopper 6 and enter the thermal detection element 4 through the infrared transmission lens 7, whereby the thermal detection element 4
The signal generated in 1 is input to the comparator 8b together with the signal detected by the chopper temperature detecting means 10 and compared with a threshold value (determination reference value) to output a human detection signal to the timer 8d. When a detection signal for a predetermined time is input to the output transistor 8e by the timer 8d, the output relay 8f
The relay contact is turned on and the elevator door 2 is driven and opened via the elevator door control unit 9.
In the case of this configuration, it is of course possible to detect a person even if the chopper 6 and the chopper temperature detecting means 10 are removed from this configuration. Further, by using a silicon lens or a silicon plate made of a silicon resin instead of the polyethylene resin of the infrared transmitting lens 7, it becomes possible to cope with flame retardance.

FIG. 3 shows that the individual heat detecting elements 4 of the heat detecting element group 4a described above have different viewing angles (hatched lines in the figure) in a substantially one-dimensional space.

[0014]

As described above, according to the human detecting device of the present invention, a heat detecting element group for injecting infrared rays through the infrared transmitting lens is provided on the upper part of the elevator car, and heat is detected when the elevator door is opened. By making the infrared field of view into the element group near the elevator door, people near the elevator door can be detected in a non-contact manner, which is related to the conventional degree of contact of the person with the door and the occurrence of blind spots. Without this, detection can be performed quickly and reliably.

Further, by making each of the heat detecting elements of the heat detecting element group have different viewing angles in a substantially one-dimensional space, it is possible to detect a person in a wider range near the elevator door. It will be possible.

Further, the invention according to claim 1 is further provided with a chopper for opening and closing an incident passage to the infrared heat detecting element group and a chopper temperature detecting means for detecting the temperature of the chopper, and the infrared heat detecting element is provided. By controlling the opening and closing of the elevator door by the incident signal of 1 and the signal from the chopper temperature detecting means, it is possible to detect a person more accurately even if the ambient temperature around the elevator door changes.

[Brief description of the drawings]

FIG. 1A is a front view in which a person detection device for an elevator door according to an embodiment of the present invention is attached to a ceiling portion of an elevator car. FIG. 1B is a side view of FIG.

FIG. 2 is a block diagram of a doujin detection device.

FIG. 3A is a front view showing a state in which each heat detection element of the heat detection element group of the doujin detection device is arranged so as to have different viewing angles in a substantially one-dimensional space. FIG. Side view of

FIG. 4 (a) is a front view in which a person detection device for a conventional elevator door is provided on both sides of an elevator car. (B) is a side view of (a).

[Explanation of symbols]

 1 Elevator Cage 2 Elevator Door 3 Human Detection Device 4 Pyroelectric Thin Film Heat Detection Element (Heat Detection Element) 4a Pyroelectric Thin Film Heat Detection Element (Heat Detection Element) Group 6 Chopper 7 Infrared Transmission Lens 8 Control Unit 10 Chopper Temperature Detection means

Claims (3)

[Claims] 1. A heat detecting element group comprising a plurality of pyroelectric thin film heat detecting elements (hereinafter referred to as a heat detecting element), an infrared ray transmitting lens, and the heat detecting element group through the infrared ray transmitting lens. With a control unit for controlling the opening and closing of the elevator door with an output signal generated by the incident infrared rays, the heat detection element group is provided on the upper part of the elevator car, to the heat detection element group when the elevator door is opened. A human detection device for an elevator door, wherein an infrared field of view is near the elevator door. 2. A person detecting device for an elevator door according to claim 1, wherein the heat detecting elements have different viewing angles in the substantially one-dimensional space. 3. A chopper for opening and closing an entrance passage of infrared rays to the heat detecting element group, and chopper temperature detecting means for detecting the temperature of the chopper are provided, and a signal from the chopper temperature detecting means is added to the control section. 2. The human detection device for an elevator door according to claim 1, wherein opening and closing of the elevator door is controlled.