JPH06191775A - Safety device for elevator door - Google Patents

Abstract

PURPOSE:To prevent misoperation from being generated due to reflecting light of a landing lighting lamp, in a device for controlling an elevator door by detecting infrared energy emitted by on/off getting passengers. CONSTITUTION:Converging zones 9A, 9B of infrared detectors 8A, 8B are set toward a spot of low infrared reflection factor. The zones are set to a landing floor in the vicinity of, for instance, a landing sill 11. Then, a reflecting amount of infrared energy is decreased. A surface of the landing sill 11 is formed rough surface to irregularly reflect the infrared energy, and the surface of the landing sill 11 is blackened to absorb the infrared energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for controlling a door by detecting passengers by an infrared detector installed above the door at the entrance of an elevator.

[0002]

2. Description of the Related Art FIGS. 9 to 14 show, for example, JP-A-3-243.
It is a figure which shows the conventional safety device of the elevator door shown by 588, FIG. 9 is a case of a double sliding door, (a) is a top view, (b) is a front view, FIG. 10 is a case of a single sliding door,
9A is a plan view, FIG. 11B is a front view, and FIG.
XI-XI line sectional view of FIG. 12, FIG. 12 is a circuit configuration diagram of the infrared detector, FIG. 13 is an output waveform diagram of each part at the time of passenger detection, FIG.
[Fig. 4] is an output waveform diagram of each part by a hall illumination lamp.

9 to 11, (1) is an elevator car, (2) is a car door, (3) is a landing door, (4) is a three-way landing frame, and (5) is a car door (2). Hanger plate fixed to the upper end, (6) is a door safety switch that is attached to the front edge of the car door (2) and operates when it contacts passengers, (7) (7A) (7B) is attached to the hanger plate (5) Fixed mounting arm, (8) (8A) (8B) is mounting arm (7)
(7A) (7B) mounted infrared detector, (9) (9A) (9B) infrared detector (8) (8A) (8B) focusing zone indicating the detection range,
(10) is a sill that guides the lower end of the car door (2), and (11) is a landing floor
The sill of the landing door (3) laid in (12), and (13) passengers.

In FIG. 12, (20) is a condenser lens for condensing infrared rays, (21) is a thermoelectric conversion element for converting infrared energy into electricity, and (22) is a capacitor connected to the thermoelectric conversion element (21). , (23) is the resistor connected to the capacitor (22), (2)
4) is an operational amplifier connected to the capacitor (22) and the resistor (23), (25) is a comparator connected to the operational amplifier (24) and having positive and negative threshold levels respectively, and (26) is a comparator (25) (27) is an elevator control panel that outputs a door opening / closing command to the door opening / closing control device (26).

The conventional elevator door safety device is constructed as described above, and the infrared detectors (8), (8A) and (8B) move according to the opening and closing of the car door (2). That is, the infrared detection direction is the vertical direction along the front edge of the car door (2) and the landing door (3), and the light collection zones (9) (9A) (9B) are accompanied by the movement of the car door (2). The car door (2) is continuously moved on the doorway from near the fully opened position to the fully closed position.

Now, when the car door (2) and the landing door (3) move from the fully open position to the fully closed position, the light collecting zones (9) (9A) (9B) also move in the door closing direction at the same time. As shown in Fig. 9 (b), if there is a passenger (13) on the doorway, this passenger (1)
Since the infrared rays emitted from 3) enter the condensing zone (9) (9A) (9B), the infrared rays are condensed by the condenser lens (20) and converted into electric energy by the thermoelectric conversion element (21). .

Now, at the time t1, the infrared rays are focused on the light collecting zone (9) (9A).
If it enters (9B) and exits from the light collecting zones (9), (9A), and (9B) at time t2, the output of the thermoelectric conversion element (21) is as shown in FIG. This output is input to the operational amplifier (24) through the differentiation circuit composed of the capacitor (22) and the resistor (23), and its output changes as shown in FIG. The comparator (25) outputs the threshold voltage V (+), V (-) of the output of the operational amplifier (24).
The pulse corresponding to the above time is output. Now the door open command is output from the control panel (27) and the car
(2) (3) is reversed and opens the door.

[0008]

In the conventional elevator door safety device as described above, infrared energy is detected by the infrared detectors (8) (8A) (8B) installed above the entrance and exit, As shown in Fig. 11, when an elevator is installed in a place where there is a lighting lamp (28) on the hall ceiling, the infrared energy of the lighting lamp (28) (the lighting lamp (28) gets warmed by its own heat) when the door is closed. Caused by)
Is reflected by the landing threshold (11) and detected by the infrared detector (8B), and there is a problem that the passenger (13) opens the reversing door even though it is not on the doorway.

That is, the threshold of the elevator (10) (11)
Is generally made of aluminum and its reflectance is high (generally 0.97), so the focusing zone of the focusing lens (20)
When (9A) and (9B) are on the landing threshold (11), the output of the thermoelectric conversion element (21) by the infrared energy of the lighting (28) reflected on the landing threshold (11), the output to the operational amplifier (24) and comparator
The output of (25) is as shown in FIG. 14, and a malfunction will occur.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an elevator door safety device capable of detecting passengers without being affected by an illumination lamp installed in a hall. To aim.

[0011]

In the elevator door safety device according to the first aspect of the present invention, the light-collecting zone of the infrared detector is set toward a place having a low infrared reflectance.

In the elevator door safety device according to the second aspect of the present invention, the light-collecting zone of the infrared detector is set toward the landing floor near the threshold.

The elevator door safety device according to the third aspect of the present invention has a sill surface formed to be rough.

A safety device for an elevator door according to a fourth aspect of the present invention has a sill surface blackened.

The elevator door safety device according to the fifth aspect of the present invention comprises a control circuit for controlling the output of the infrared detector in accordance with the amount of change in the illuminance of the focusing zone of the infrared detector. .

[0016]

In the first aspect of the present invention, the infrared ray condensing zone is set toward a place having a low infrared reflectance, and the second aspect is provided.
In the invention, since the light collecting zone is set toward the landing floor near the threshold, the amount of infrared energy reflected is small.

Further, in the third aspect of the invention, since the sill surface is formed as a rough surface, infrared energy is diffusely reflected on the sill surface.

Further, in the fourth invention, since the sill surface is blackened, infrared energy is absorbed by the sill.

In the fifth aspect of the present invention,
Since the output of the infrared detector is controlled according to the amount of change in the illuminance of the infrared condensing zone, even if the infrared energy from the hall illumination lamp is input, that effect is eliminated.

[0020]

【Example】

Example 1. 1 to 3 are views showing an embodiment of the first and second inventions of the present invention, and FIG. 1 shows a case of a double sliding door,
(A) is a plan view, (b) is a front view, FIG. 2 is a case of a sliding door, (a) is a plan view, (b) is a front view, and FIG. 3 is FIG.
It is a III-III line sectional view of (b), and the same code | symbol is attached | subjected to the same part as a conventional device (the same is true of other examples).

In this embodiment, the light collecting zones (9) (9A) (9B)
Is set on the landing floor (12) near the landing threshold (11).
The landing floor (12) is generally a silicon system such as tile or marble,
Alternatively, since it is a fibrous substance such as a carpet, the light reflectance is low. Therefore, the amount of infrared energy reflected from the landing lights (28) and entering the infrared detectors (8), (8A), and (8B) is small, and the effects of the lights (28) when the door is closed are eliminated. To be done.

Example 2. FIG. 4 is a vertical sectional view of a threshold portion showing an embodiment of the third invention of the present invention. Note that FIG.
And FIG. 2 are also used in this embodiment. In this example,
The surface of the landing threshold (11) is roughened (11a). Therefore, infrared energy from the landing lights (28) is diffusely reflected on the rough surface (11a) of the threshold (11), and the infrared detector
(8) The reflected infrared energy entering the (8A) and (8B) becomes small, and the influence of the door closing operation is eliminated.

Example 3. FIG. 5 is a longitudinal sectional view of a threshold portion showing an embodiment of the fourth invention of the present invention. Note that FIG.
And FIG. 3 are also used in this embodiment. In this example,
The surface of the landing sill (11) is covered with a black film (11b) to be blackened. Therefore, the infrared energy from the landing lights (28) is absorbed by the black film (11b) of the threshold (11), the infrared energy entering the infrared detectors (8) (8A) (8B) becomes small, The influence of the lighting (28) when the door is closed is eliminated. Here, the infrared energy from the illumination lamp (28) is absorbed by the sill (11), but since the heat capacity of the sill (11) is sufficiently large, the temperature rise of the sill (11) can be ignored.

Example 4. 6 to 8 are views showing an embodiment of a fifth invention of the present invention, FIG. 6 is a circuit configuration diagram of an infrared detector, FIG. 7 is an explanatory view of output relations of respective parts of a detection judgment circuit, and FIG. It is an input / output waveform diagram of each part at the time of closing operation. Note that FIG.
3 is also used in this embodiment.

In FIG. 6, (31) is an illuminance sensor for detecting the illuminance of the light collecting zone (9), (9A) and (9B) formed by the condenser lens (20), and (32) is the illuminance sensor. A resistor connected to (31), (33) a capacitor connected to the illuminance sensor (31) and the resistor (32), (34) a resistor connected to the capacitor (33), and (35) a capacitor (33 ) And an operational amplifier connected to the resistor (34), (36) is connected to the operational amplifier (35) and has comparators (3) having threshold levels at the positive and negative electrodes, respectively.
Reference numeral 7 is a detection judgment circuit connected to the comparators 25 and 36.

Next, the operation of this embodiment will be described. The process from the input of infrared energy by the condenser lens (20) to the output of the comparator (25) is as described above. On the other hand, when the light of the illumination lamp (28) is reflected by the landing threshold (11), infrared energy is reflected as described above, but at the same time, the light in the visible light region is also reflected and the illuminance is increased. Therefore, as shown in FIG. 8, when the door is closed, the light of the illumination lamp (28) is reflected by the landing threshold (11), so that the infrared energy focused on the condenser lens (20) is increased. At the same time, the illuminance incident on the illuminance sensor (31) also increases.

Finally, the outputs of the operational amplifiers (24) and (35) respectively exceed the threshold levels of the comparators (25) and (36), and the outputs of the comparators (25) and (36) become "H", and the detection judgment circuit is obtained. Input to (37). As shown in FIG. 7, the detection judgment circuit (37) outputs "H" only when the output of the comparator (36) is "L" and the output of the comparator (25) is "H". L ”. Therefore, in the above case, the output of the detection determination circuit (37) becomes "L", the detection state is not reached, the door closing operation is continued, and the car door (2) and the hall door (3) are fully closed.

[0028]

As described above, in the first invention of the present invention, the infrared condensing zone is set toward a place having a low infrared reflectance, and in the second invention, toward the landing floor near the threshold. Since it is set, the reflection amount of infrared energy is small, and in the third invention, since the threshold surface is formed to be a rough surface,
Infrared energy is diffusely reflected on the sill surface, and in the fourth invention, the sill surface is blackened, so the infrared energy is absorbed by the sill.

As a result, the reflected infrared energy entering the infrared detector becomes small, and even if an illumination lamp is installed at the hall, it is possible to prevent malfunctions due to the illumination lamp during the door closing operation.

Further, in the fifth aspect of the invention, the output of the infrared detector is controlled in accordance with the amount of change in the illuminance of the infrared condensing zone. Therefore, even if the infrared energy from the hall illumination lamp is input, its effect is not affected. It is removed, and there is an effect that a malfunction during the door closing operation can be prevented.

[Brief description of drawings]

1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a plan view of a double sliding door, and FIG.

2A and 2B are views showing Embodiment 1 of the present invention, in which FIG. 2A is a plan view in the case of a sliding door, and FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a vertical sectional view of a threshold portion showing a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a threshold portion showing a third embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of an infrared detector showing a fourth embodiment of the present invention.

7 is an explanatory diagram of output relations of respective parts of the detection determination circuit of FIG.

FIG. 8 is a waveform diagram of input and output of each part when the door is closed according to FIG.

9A and 9B are diagrams showing a conventional safety device for an elevator door, in which FIG. 9A is a plan view of a double sliding door, and FIG. 9B is a front view of the same.

10A and 10B are views showing a conventional safety device for an elevator door, in which FIG. 10A is a plan view in the case of a sliding door, and FIG.

FIG. 11 is a sectional view taken along line XI-XI of FIG.

12 is a circuit configuration diagram of the infrared detector of FIG.

FIG. 13 is an output waveform diagram of each part when a passenger is detected according to FIG.

14 is an output waveform diagram of each part by the hall illumination lamp of FIG.

[Explanation of symbols]

 2 Car door 3 Landing door 8, 8A, 8B Infrared detector 9, 9A, 9B Infrared energy condensing zone 11 Landing threshold 11a Rough surface 11b Black film 12 Landing floor 21 Control circuit (thermoelectric conversion element) 25 Control circuit (comparator) ) 31 control circuit (illuminance sensor) 36 control circuit (comparator) 37 control circuit (detection determination circuit)

Claims (5)

[Claims] 1. An infrared detector is installed above an entrance door of an elevator, and infrared rays emitted by a human body in a light collection zone set near the entrance is detected by the infrared detector to control the door. In the above device, the safety device for an elevator door is characterized in that the light collecting zone is set toward a place having a low infrared reflectance. 2. An infrared detector is installed at an upper part of a door guided to a sill laid on the floor of an entrance of an elevator, and infrared rays emitted by a human body in a light collection zone set near the sill are emitted. In the device for controlling the door by detecting with the infrared detector, the elevator door safety device is characterized in that the condensing zone is set toward a landing floor near the threshold. 3. An infrared detector is installed on an upper part of a door guided by a sill laid on the floor of an entrance / exit of an elevator, and infrared rays emitted by a human body in a light collecting zone set near the sill are emitted. A safety device for an elevator door, wherein the sill surface is formed to be a rough surface in a device for controlling the door detected by the infrared detector. 4. An infrared detector is installed on an upper part of a door guided by a sill laid on the floor of an entrance of an elevator, and infrared rays emitted by a human body in a light collecting zone set near the sill are emitted. A safety device for an elevator door, wherein the sill surface is blackened in the device for controlling the door detected by the infrared detector. 5. An infrared detector is installed above the door of the elevator entrance, and the infrared detector detects infrared rays emitted by a human body in a light collecting zone set near the entrance to control the door. The safety device for an elevator door according to claim 1, further comprising a control circuit that controls the output of the infrared detector according to the amount of change in the illuminance of the condensing zone.