JPH10265157A - Safety device for entrance of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the opening and closing operation of a door to promote safety by operating a distance to an object according to a detection signal of a photodetector by a distance operation circuit, and discriminating whether the object is within a designated range or not according to the arithmetic result by a distance discriminating circuit to detect the existence/absence of the object even if it is small. SOLUTION: An object 111 and an object 112 are so constructed that an object 110 is moved up and down parallel to a vertical frame 7R. Reflected light 10aR1 is equivalent to be positioned on the counter-vertical frame 7 side as compared with the reflected light 10aR0. Similarly the reflected light 10aR2 is equivalent to be positioned on the vertical frame 7R side as compared with the reflected light 10aR0. The reflected light 10aR0, 10aR1, and 10aR2 is total reflection, but in the case of partial reflection, distance operation is conducted according to the center of a spot formed on the photo detecting surface by the partial reflection. If it is judged to be higher than a threshold FL, opening and closing of a door is stopped by a distance discriminating circuit, and if lower than the threshold FL opening and closing of a door is not stopped.

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 a doorway of an elevator, and more particularly to a device for preventing a finger or the like from being caught in a gap between a door and a door pocket when the door is opened. Things.

[0002]

2. Description of the Related Art A door for opening and closing an entrance of an elevator is one of devices directly contacted by a user, and safety of the opening and closing operation is indispensable for an elevator to be generally accepted as a public device. From this point of view, a safety device is provided at the front end of the door, and when the front end is touched during the door closing operation, the door is turned upside down and opened. In addition, an electromagnetic sensor, an ultrasonic sensor, a thermal sensor, a photoelectric sensor, or the like is used, and sufficient attention is paid to ensuring safety against the door closing operation. On the other hand, when the door is opened, there is no situation where an object collides with the door, so that the same level of safety measures as when the door is closed have not been taken. However, even when the door is opened, if the child is leaning on the door of the hall, or if the car is full and passengers are pressed against the door, the door is stored in the door pocket. There is a danger of injury due to the hand or finger being pulled between the door and the vertical frame of the doorway, and there have been reports of accidents in the past.

A safety device for preventing such accidents is disclosed in, for example, Japanese Patent Publication No. Hei 7-106867. FIG. 12 shows the outline of the invention described in the above-mentioned official gazette. In the figure, 1 is a landing, 2 is a car,
3 is a car door that opens and closes the entrance of car 2, 4 is a hall door that opens and closes the entrance of hall 1, 5 is a wall that partitions the hoistway, 6
Is a door pocket in which the landing door 4 is stored, 7 is a vertical frame forming an opening end of the entrance, 7a is a gap between the vertical frame 7 and the landing door 4, and 8 is formed in an intermediate portion of the vertical frame 7. Recess, 9 is gap 7
a floodlight attached to the lower part of the vertical frame 7 close to a
The light beam 9a is irradiated upward. Reference numeral 10 denotes a light receiver attached to the upper part of the vertical frame 7 for receiving the light beam 9a, and reference numeral 11 denotes an object to be detected inserted into the gap 7a, for example, a human finger.

That is, normally, since there is no obstacle in the gap 7a, the light beam 9a emitted from the projector 9 is
Received. Therefore, when the car 2 arrives at the predetermined floor, the car door 3 and the landing door 4 open without any trouble. By the way, when the finger 11 or the like is inserted into the gap 7a,
Light beam 9 a is blocked by finger 11. Due to this interruption, the light receiver 10 cannot detect the light beam 9a, and the landing door 4
Is immediately stopped. This stop prevents the finger 11 or the like from being caught in the gap 7a between the vertical frame 7 and the landing door 4.

[0005]

However, in the conventional safety device at the entrance of the elevator, the light beam 9a cannot be detected unless the light flux 9a is cut off to a certain degree or more and the light quantity of the light receiver 10 becomes less than a predetermined value. The light beam 9a, which is very powerful for the detection, had to be a thin light beam. For this reason, the detection range is narrow, and when an obstacle is large, it can be easily detected, but it is not easy to detect a small object such as a little finger with a thin light beam. However, in reality, the smaller one is more likely to be caught in the gap between the door and the vertical frame, so that a small injury cannot be prevented and the safety device is not sufficient. Also, the vertical frame forming the entrance is an important part as interior decoration and must not impair the aesthetic appearance. Furthermore,
It was also desired that the maintenance and management were easy, for example, by adopting a structure for preventing the reduction of the transmitted light due to dust.

[0006]

An elevator doorway safety device according to the present invention is provided with a floodlight mounted on a door pocket side of an upper frame of a car or an entrance of a hall to emit a light beam downward along a vertical frame of the doorway. Irradiation is performed, and a light receiver is provided along with the light transmitter on the door pocket side in the upper frame. When the object is within a predetermined range and reflects the light beam from the light emitter, the presence or absence of the object in the vertical frame portion is detected in a manner of light reception when the reflected light is received by the light receiver.
Further, the distance to the object is calculated by a distance calculation circuit based on the detection signal of the light receiver, and whether or not the object is within a predetermined range is determined by the distance calculation circuit based on the calculation result of the distance calculation circuit. According to the result, the opening and closing operation of the door is prevented.

The elevator entrance / exit safety device according to the present invention is provided with, as a light receiver, a lens for condensing light reflected by an object by blocking a light beam from the projector, and a lens provided behind the lens. A light-receiving element that receives the light and outputs a different signal depending on the position at which the light is received. The output signal of the light-receiving device determines the distance to the object and whether the object is within a predetermined range. The discrimination is made to prevent the opening and closing operation of the door.

Further, the elevator entrance / exit safety device according to the present invention is provided with a lens for condensing reflected light, which is reflected when an object blocks a light beam emitted from a projector, and a lens behind the lens. Receiving the above condensed light,
A light-receiving element that outputs a different signal depending on the amount of received light, and determines the distance to the object and whether or not the object is within a predetermined range based on the output signal of the light-receiving device to prevent the opening and closing operation of the door. It was made.

Further, in the elevator entrance / exit safety device according to the present invention, the light receiver is installed closer to the door pocket than the light transmitter.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the drawings, the same reference numerals indicate the same or corresponding parts. First, a device for an entrance safety device for an elevator according to the present invention will be described with reference to FIGS. In the figure, the same reference numerals as those in FIG.

FIG. 1 is a front perspective view of a landing equipped with an elevator entrance / exit safety device according to the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. In the figure, 1S is a threshold provided at a landing at the entrance, 4R is a landing door that opens and closes the right half of the two-doors, 4L is a landing that opens and closes the left half of the two-doors. , 6R is a door pocket for door 4R, 6L is a door pocket for door 4L, 7R is a vertical frame on the right side of the landing entrance, 7L is a vertical frame on the left side similarly, 7aR is a gap between the door 4R and the vertical frame 7R, 7aL is a gap between the door 4L and the vertical frame 7L.

9R is a light transmitter attached to the door pocket 6R side of the door 4R for opening and closing the doorway in the upper frame 12 of the doorway of the hall, and irradiating the light beam 9aR downward along the vertical frame 7R of the doorway. Similarly, it is a light projector attached to the door pocket 6L side of the door 4L that opens and closes the doorway in the upper frame 12, and irradiates the light beam 9aL downward along the vertical frame 7L of the doorway.

10R is provided in the upper frame 12 closer to the door pocket 6R than the light projector 9R, and the object 11 receives the reflected light 10aR which is reflected by blocking the light from the light projector 9R, so that the object 11 A light receiver 10L which detects and outputs the presence of the light 11 is similarly provided with a light transmitter 9L in the upper frame 12.
Is a light receiver that is provided in parallel with the door pocket 6L and detects the presence of the object 11 in the vertical frame 7L by outputting reflected light that is reflected by the object 11 blocking light emitted by the light projector 9L. .

Reference numeral 20 denotes a door rail provided horizontally on the back surface of the upper wall 5 of the upper frame 12, reference numeral 21 denotes a roller which rolls on the rail 20 by suspending the landing door 4R, and reference numeral 22 denotes a rail 2
It is a hanger case that covers 0 part.

That is, the landing doors 4R and 4L are connected to the rails 20.
It is hung by the roller 21 which rolls above, is driven by the door drive device (not shown) mounted on the car in conjunction with the car door, and is stored in the door pockets 6R and 6L, respectively. With this, the door opening operation ends. Door closing operation is reverse to door 4
The door closing operation is ended by feeding out R and 4L from the door pockets 6R and 6L and closing the entrance. By the way, as shown in FIGS. 2 and 4, for example, it is assumed that the finger 11 approaches the gap 7aR from the direction indicated by the arrow A during the door opening operation of the landing 4R. When the finger 11 comes into contact with the landing door 4R, the finger 11 tends to be drawn into the door pocket 6R due to the friction.

However, as shown in FIG. 4, the finger 11 partially blocks the light beam 9aR before being drawn into the door pocket 6R.
The reflected light 10aR at this time reaches the light receiver 10R.
The light receiver 10R detects the reflected light 10aR and stops the door opening operation of the door 4R. Thereby, the user can avoid the finger 11 being pulled into the door pocket. Further, the light emitter 9R and the light receiver 10R are both installed in the upper frame 12, the light emitter 9R emits light with the opening directed downward, and the light receiver 10R also has the opening directed downward from below to above. Is received, the adhesion of dust and the like can be reduced as compared with the case where the opening faces upward, and the burden of maintenance work such as dust removal can be reduced. The same applies to the landing door 4L, the light emitter 9L, and the light receiver 10L.

Next, regarding the light projector 9R and the light receiver 10R, when the object 11 such as a human finger is to be inserted into the gap 7aR, the door opening operation is stopped, as shown in FIGS. This will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of the light projector 9R and the light receiver 10R.
In the figure, 31 is a light emitting element, 32 is a light emitting control circuit for comparing the amount of the emitted light flux 9aR by the light emitting element 31 with the surrounding external light and controlling the amount of light, and 33 is a light emitting element for converting the light from the light emitting element 31 from parallel rays. This is a light projection lens that converts the light into a light beam.

Reference numeral 35 denotes a condensing lens for condensing the reflected light 10aR. The center 35J of the condensing lens is set at a position on the vertical frame 7R side by a distance J0 from the center 33J of the light projecting lens 33. Numeral 36 denotes a light receiving element having both ends as electrodes and a light receiving surface having a length L between the two electrodes. The center 36J is eccentrically disposed on the vertical frame 7R side by a distance X0 from the center 35J of the condenser lens 35. The reflected light 10aR condensed by the condensing lens 35 outputs a different signal depending on the position of the spot irradiated on the light receiving surface. 37 is a distance calculation circuit for calculating the position when the object 11 blocks the light beam 9aR based on the output signal of the light receiving element 36, and 38 should stop the door operation for the distance calculated by the distance calculation circuit 37? It is a distance discriminating circuit for discriminating whether or not it is. Reference numeral 39 denotes a blocking circuit for blocking the opening and closing operation of the door based on the determination result from the distance determination circuit 38, which opens a door driving circuit (not shown). FIG. 6 shows an equivalent circuit of the light receiving element 36, and the reflected light 1 condensed by the condenser lens 35.
When the spot center of 0aR is located at a distance of Z from one electrode, that is, at a distance P from the center 36J of the light receiving element, a photocurrent I0 is generated at the spot center. Assuming that the total resistance of the light receiving element 36 is RL and the resistance of a portion corresponding to the distance Z is RZ, the photocurrent I0 is divided into currents I1 and I2 via the resistors. That is, the following relational expression holds. I0 = I1 + I2 I1 = (RL-RZ) / RZ I2 = RZ / RL Normally, the resistance layer is uniform, and the length and the resistance are proportional. I1 = (LZ) / Z I2 = Z / L The ratio between I1 and I2 is I1 / I2 = (L−Z) / Z = (L / Z) −1 Therefore, when the currents I1 and I2 are known, the distance Z, that is, the spot center of the reflected light 10aR is calculated. Can be.
Here, since it is calculated from the ratio of the current value, the strength of the current,
Consequently, the amount of light is irrelevant.

Next, based on FIGS. 7 and 8, the light receiving element 3 of the reflected light 10aR when the object 11 moves in the vertical direction will be described.
6 will be described. In the drawing, JH is the mounting center of the light projecting lens 33 and the condensing lens 36, 110 is an object irradiated to the light flux 9aR at a distance R0 from the mounting center JH, and the light receiving surface of the light receiving element 36 is totally reflected by the reflected light 10aR0. The spot center is formed at a position P0 away from the center 36J, that is, at the position of the center 36J. With respect to the spot center P0, the distance calculation circuit 3
7 outputs the signal PR0 of FIG. In response to this signal PR0, the distance determination circuit 38 outputs a signal for stopping the opening and closing of the landing door 4R. 111 is also at the distance R1 and the luminous flux 9a
The reflected light 10aR1 totally reflected by the object irradiated to R
A spot center is formed at a distance P1 from the center 36J of the light receiving surface to the vertical frame 7R side. For this spot center P1, the distance calculation circuit 37 outputs a signal PR1 of FIG. In response to this signal PR1, the distance determination circuit 38 outputs a signal for stopping the opening and closing of the landing door 4R. Reference numeral 112 denotes an object which is also at the distance R2 and is radiated to the light beam 9aR. A spot center is formed at the position of the distance P2 from the center 36J of the light receiving surface to the vertical frame 7R side with respect to the totally reflected reflected light 10aR2. With respect to the spot center P2, the distance calculation circuit 37
Outputs the signal PR2 of FIG. In response to this signal PR2, the distance determination circuit 38 outputs a signal for stopping the opening and closing of the landing door 4R. FL is a “threshold” imagined at a position RF a predetermined distance higher than the landing 1 and at a distance RF from the mounting center JH,
When the object 11 is present at the threshold value FL and the light is totally reflected, a spot center is formed at a distance PF from the center 36J of the light receiving surface to the side opposite to the vertical frame 7R. For this spot center PF, the distance calculation circuit 37 outputs the signal PRF of FIG. The reflected light totally reflected below the “threshold value” FL further forms a spot center on the side opposite to the vertical frame 7R. Accordingly, the distance calculation circuit 37 outputs an expected output even for the reflected light 10aR totally reflected from the lower side than the threshold value FL. Is not output, so the landing door 4R
Has nothing to do with the opening and closing of. Therefore, landing 1
The opening / closing of the landing door 4 is not hindered by the reflected light 10aR from the floor surface.

An object in the area ZN from the light beam 9aR to the vertical frame 7R cannot be detected. Therefore, the opening and closing of the landing door 4R is impeded with respect to the reflected light 10aR from the region belonging to at least one of the region ZF and the region ZN partitioned by the reflected light 10aRF from the threshold value FL and the vertical frame 7R. It will not be done. But,
In order for an object to enter this area, the object must inevitably pass through the detection area by the light beam 9aR, and this detection prevents opening and closing of the landing door 4R and the linked landing door 4L. Further, since the threshold value FL is set in the immediate vicinity of the landing 1, the threshold value FL cannot be passed between them, and the landing door 4 </ b> R
The safety of opening and closing is ensured. FIG.
, The side of the light beam 9aR opposite to the vertical frame 7R is a region where normal getting on and off is performed, and reflected light from such a region is naturally undetectable. Even if it is detected, the distance discrimination circuit 38 does not output a signal for preventing door opening and closing. This is because the opening and closing of the landing door 4R should not be hindered by such reflected light.

FIG. 7 shows an object 111 and an object 112.
Is assumed to move the object 110 in the vertical direction in parallel with the vertical frame 7R, but the reflected light 10aR1 is equivalent to being located on the side opposite to the vertical frame 7R with respect to the reflected light 10aR0. Similarly, the reflected light 10aR2 is equivalent to being located on the vertical frame 7R side compared to the reflected light 10aR0. Therefore, the distance P1 in FIG.
It is located on the R side, and the distance P2 is located on the vertical frame 7R side of the center 36J.

Although the reflected lights 10aR0, 10aR1, and 10aR2 are total reflections, in the case of partial reflections, the distances are calculated in the same manner as described above based on the center of the spot formed by the partial reflections on the light receiving surface. When it is determined that the value is higher than the value FL, the opening / closing of the door is stopped by the distance determination circuit 38, and when it is determined that the value is lower than the threshold value FL, the opening / closing of the door is not stopped.

Further, the object 110 is, for example, a black body,
Even when the light beam 9aR is totally absorbed without being reflected, a partial absorption state occurs in the process of completely absorbing the light beam 9aR, and in the process of the partial absorption, the light receiving element 36 receives the reflection of the ambient light by the remaining portion. Based on the received light, the distance is calculated in the same manner as described above, and the safety when opening and closing the landing door 4R is ensured.

Next, a case where the object 11 moves in the horizontal direction and approaches the vertical frame 7R will be described with reference to FIGS. 9 and 10. FIG. In FIG. 9, when the object 11 moves 110a → 110b → 110c from the left side of the drawing as shown in the upper part of FIG. (a) to (e), and spot centers on the light receiving element 36 corresponding to (a) to (e), respectively, are shown in (a) to (e) on the right side. That is, 110a is located at a position below the mounting center JH by the distance R0, and the reflected light 9aR
Is an object that reflects about 25% of light. At this time, the center of the spot is formed at the position 10aJa by the reflected light 10aPa, and the distance calculation circuit 37 outputs the signal PR0a as shown in FIG. In response to this signal PR0a, the distance determination circuit 38 outputs a command to stop the opening and closing of the landing door 4R, thereby ensuring safety. Similarly, 1
10b is a position below the mounting center JH by the distance R0, and transmits the reflected light 9aR by 50 on the side opposite to the vertical frame 7R.
An object that reflects percent. The reflected light 10 at this time
The center of the spot is formed at position 10aJb by aPb, and the signal P is output from the distance calculation circuit 37 as shown in FIG.
R0b is output. In response to this signal PR0b, the distance determination circuit 38 outputs a command to stop the opening and closing of the landing door 4R, thereby ensuring safety. Similarly, an object 110c is located at a position below the mounting center JH by a distance R0 and reflects 100% of the reflected light 9aR. The position 10aJ is determined by the reflected light 10aPc at this time.
The center of the spot is formed at c, and the signal PR0c is output from the distance calculation circuit 37 as shown in FIG. In response to the signal PR0c, the distance determination circuit 38 outputs a command to stop the opening and closing of the landing door 4R to ensure safety. Similarly, 110d is the reflected light 9 on the vertical frame 7R side.
The object reflects 50% of aR, and the distance calculation circuit 37 outputs a signal PR0d as shown in FIG. In response to this output, the distance determination circuit 38 outputs a command to stop the opening and closing of the landing door 4R. Similarly, 110
Further, e is an object reflecting about 25% of the reflected light 9aR on the side of the vertical frame 7R, and a signal PR0e is output from the distance calculation circuit 37 as shown in FIG. 10, and the opening and closing of the landing door 4R is similarly stopped. .

Here, as shown in FIG. 9, the object 11 moves in a direction approaching the vertical frame 7R from a distant position to form the light beam 9a.
When R is reflected, as shown in FIG.
Output signals are PR0a-PR0b-PR0c-PR0d
-PR0e. This change is equivalent to the change of the output signal from PR1 to PR0 to PR2 in FIG. 8, and when the object 11 approaches the vertical frame 7R, the distance calculation circuit 37 changes.
Will output a calculation result equivalent to the movement of the object 11 from above to below. In other words, since the calculation is performed assuming that the position is distant from the threshold value FL, even if the threshold value FL changes, the change does not cause the distance determination circuit 38 to make an erroneous determination.

In the first embodiment, the light flux 9aR
Is a parallel light beam, but is not necessarily limited to this, and it is sufficient that reflected light causes a change in the light receiving surface of the light receiving element 36. In addition, although the case of the landing door 4R has been described, it is clear that the same applies to the case of the landing door 4L, and the description is omitted. In the first embodiment, the light emitting device 9R and the light receiving device 10R
Is provided, but the same applies to the case of providing on the car side, and the description is omitted.

Embodiment 2 FIG. FIG. 11 shows another embodiment of the present invention. In the figure, reference numeral 41 denotes an A / D conversion circuit for performing A / D conversion of the output current value of the light receiving element 36, and reference numeral 42 denotes an initial state in which there is no object in the vertical frame 7R portion that obstructs opening and closing of the door prior to operation. An ambient light storage device 43 for storing the output from the light receiving element 36, and a selection circuit 43, b
To the ambient light storage device 42
Then, it is tilted to the a side and the output from the light receiving element 36 is input to the comparator 44. The comparator 44 compares the output of the light receiving element 36 in the initial state stored in the ambient light storage device 43 with the output of the light receiving element 36 in the operating state, and if there is a difference, the object 11 is located near the vertical frame 7R. Yes, landing door 4
Output is performed so as to stop the opening and closing operation of R, and if there is no difference, there is no object 11 in the vicinity. According to the second embodiment, it is not necessary to set the threshold value FL, and even if the reflected light 10aR is brighter or darker than the surroundings, the light receiving element 36 is in the initial state. As long as a different signal is output, it is determined that the object 11 is present near the vertical frame 7R, and the opening and closing of the landing door 4R is prevented. Therefore, the intended purpose can be achieved also by this.

Embodiment 3 In the first embodiment, the distance to the object 11 is calculated based on the position of the center of the spot formed by the reflected light 10aR on the light receiving surface of the light receiving element 36 to prevent the opening and closing operation of the door. ,
That is, an element that outputs according to the light intensity, for example, a photodiode or the like is used, the distance to the object is detected by the output, and if the detection result is shorter than the threshold, the opening / closing operation of the landing door 4R is performed. It is possible to achieve the intended purpose by blocking it.

[0029]

According to the first aspect of the present invention, there is provided a floodlight for irradiating light downwardly along the vertical frame of the entrance to the door pocket side in the upper frame of the entrance of the car or the landing, and the floodlight. A light receiver is also provided on the side of the door pocket in the upper frame, and the object receives the reflected light that reflects the light emitted by the light emitter upward and detects the presence of the object that hinders the opening and closing of the door. The light-emitting part of the light-emitting device and the light-receiving part of the light-receiving device are both facing downward, so that the accumulation of dust on such parts can be reduced, and maintenance management for maintaining functions is easy. This has the effect of being
Further, the distance to the object is calculated by the distance calculation circuit in response to the output signal of the light receiver. This has the effect of being able to detect no.

According to the second aspect of the present invention, when there is no object in the vertical frame portion of the entrance that obstructs the opening and closing of the door, the light is received by the light receiver and the output is stored in the ambient light storage device. In addition, the stored value of the ambient light storage device and the output of the light receiver are compared by a comparator, and when the output of the light receiver is different from the stored value, the opening and closing operation of the light receiver is prevented. It is sufficient that the light receiving state of the light source is different from the initial state. Therefore, there is an effect that even a small object whose degree of reflection of the light beam by the light projector is small can be detected.

According to the third aspect of the present invention, the light receiver outputs different signals depending on the position at which the reflected light condensed by the lens is received by the light receiving element. Is detected, so
There is an effect that even a small object whose degree of reflection of the light beam by the light projector is small can be detected.

According to the fourth aspect of the present invention, since the light receiver is disposed closer to the door pocket than the light transmitter, an object such as a vertical frame which does not originally hinder opening and closing of the door is erroneously detected. Without this, there is an effect that an obstacle close to a narrow gap between the door and the vertical frame of the doorway can be detected at an initial stage of starting to reflect the projection light beam.

According to the fifth aspect of the present invention, the light receiver outputs different signals depending on the amount of received light.
Similarly, there is an effect that even a small small object can be detected.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a landing hall equipped with an elevator entrance / exit safety device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a block diagram illustrating a configuration of a light projector and a light receiver.

FIG. 6 is an equivalent circuit of a light receiving element.

FIG. 7 is an explanatory diagram of an operation of a light projector and a light receiver.

FIG. 8 is an explanatory diagram of an operation of the distance calculation circuit.

FIG. 9 is a diagram illustrating the operation of a light projector and a light receiver.

FIG. 10 is a diagram illustrating the operation of the distance calculation circuit.

FIG. 11 is a block diagram showing a configuration of a light receiver according to a second embodiment of the present invention.

FIG. 12 is a landing perspective view showing a conventional entrance safety device for an elevator.

[Explanation of symbols]

1 platform, 1S threshold, 2 cars, 3 car doors, 4
Landing doors, 4R, 4L landing doors, 5 walls, 6 door pockets, 6 doors
R, 6L door pocket, 7 vertical frame, 7R, 7L vertical frame, 7a
Gap, 7aR gap, 7aL gap, 8 recess, 9 floodlight, 9R, 9L floodlight, 9a luminous flux, 9aR, 9a
L light flux, 10 light receivers, 10R, 10L light receiver, 1
0aR reflected light, 11 objects, 12 upper frames, 20 rails, 21 rollers, 22 hanger case, 31 light emitting element, 32 light emitting control circuit, 33 light emitting lens, 34
Focusing lens, 35J Focusing lens center, 36 light receiving element, 36J Light receiving element center, 37 Distance calculation circuit,
38 distance discriminating circuit, 39 blocking circuit, 41 A / D conversion circuit, 42 ambient light storage device, 43 selection circuit, 44
Comparator, 110 objects, 110a object, 110b
Object, 110c object, 110d object, 110e object, 111 object, 112 object, distance between J0 lens, X0 Distance between condenser lens and light receiving element.

Claims (5)

[Claims] 1. A floodlight mounted on the door frame side of a door that opens and closes the doorway in the upper frame of the doorway of the car or the landing, and irradiates a light beam downward along the vertical frame of the doorway; A light receiver that is provided in parallel with the door pocket side in the upper frame and receives reflected light in which an object reflects a light beam from the light projector, detects the presence of the object in the vertical frame portion, and outputs the light; A distance calculation circuit for calculating a distance to the object based on the output signal, a distance determination circuit for determining whether or not the object is within a predetermined range based on a calculation result of the distance calculation circuit; and a distance determination circuit. And a blocking circuit for blocking the opening and closing operation of the door according to the result of the determination. 2. A floodlight which is attached to a door pocket side of a door which opens and closes the entrance in an upper frame of an entrance of a car or a landing, and emits light downward along the vertical frame of the entrance,
A light receiver that is provided alongside the door pocket side in the upper frame together with the light emitter, receives the reflected light that reflects the light flux from the light emitter, detects the presence of the object in the vertical frame part, and outputs the light. An ambient light storage device that stores the output of the light receiver in an initial state where the object is not present in the vertical frame portion at all, and a comparator that compares the stored value of the ambient light storage device with the output of the light receiver. And a blocking circuit for blocking the opening and closing operation of the door based on the comparison result. 3. A light receiver is provided in an upper frame of an entrance of a car or a landing, together with a projector on a door pocket side of a door that opens and closes the entrance, and an object collects reflected light that reflects a light beam from the projector. And a light-receiving element provided behind the light-collecting lens for receiving the light-condensed light and outputting a different signal depending on the light-receiving position. Item 3. An elevator entrance / exit safety device according to item 2. 4. The elevator entrance / exit safety device according to claim 3, wherein the light receiver is installed closer to the door pocket than the light emitter. 5. A light receiver is provided in the upper frame of a car or an entrance of a landing, together with a light projector on a door pocket side of a door that opens and closes the entrance, and an object collects reflected light that reflects a light beam from the light projector. And a light-receiving element provided behind the condensing lens for receiving the condensed light and outputting a different signal depending on the amount of received light. Item 3. An elevator entrance / exit safety device according to item 2.