JP2005047659A - Information transmitting device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform normal transmitting/receiving of an optical signal even when distance between a transmitter and a receiver is varied by traveling of a car. <P>SOLUTION: A control panel 7 lifts the car 1 having the transmitter 5, and outputs information of a present car position of the car 1 to the transmitter 5. The transmitter 5, according to the car position information, converts a video signal for transmission to an optical signal required and sufficient for normally displaying the video signal for transmission on a video display apparatus 4 and having an intensity that does not provide an eddy current state to the receiver 6, and outputs it to the receiver 6. Thus, even when the distance between the transmitter 5 and the receiver 6 is varied by traveling of the car 1, normal transmitting/receiving of the optical signal can be performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information transmission apparatus for an elevator that transmits information such as video by optical communication.
[0002]
[Prior art]
Conventionally, there is an elevator that displays arbitrary information, for example, video information on a monitor installed in an elevator car (for example, see Patent Document 1).
[0003]
When the above-described device for storing video information is installed outside the car, it is necessary to transmit information from this device to a monitor in the car. As means for performing this transmission, for example, wired communication or optical communication can be considered. When using optical communication, a transmitter and a receiver for optical communication are respectively installed on the extension of the moving shaft of the hoistway. For example, the transmitter is installed in the lower pit of the hoistway, and the receiver is installed in the car. In the transmitter, the video information for transmission is converted into a directional optical signal and transmitted to the receiver. Here, on the receiver side, the received optical signal is reconverted to the original video information and displayed on the monitor. In the case of performing transmission by optical communication, the equipment can be simplified compared to the case of performing wired communication using a coaxial cable or the like.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-081548
[Problems to be solved by the invention]
When the receiver is attached to the car, the distance between the receiver and the transmitter changes when the car moves up and down, and the intensity of the optical signal received on the receiver side changes. In this case, the optical signal is attenuated as the distance between the receiver and the transmitter increases, which affects information transmission.
[0006]
As a means to prevent a decrease in the intensity of the received optical signal when the transmitter and the receiver are separated, the optical signal is output so that a normal video signal can be output to the monitor when the transmitter and the receiver are most separated. A method of setting the transmission strength of the. However, in this case, when the distance between the transmitter and the receiver becomes short, an excessive optical signal is emitted to the receiver, which causes the receiver to generate heat and the like. It may cause failure.
[0007]
The present invention has been made in view of the above problems, and provides an information transmission device for an elevator that can perform normal transmission and reception of optical signals even when the distance between the transmitter and the receiver changes due to the raising and lowering of the car. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In other words, an elevator information transmission device according to the present invention is an elevator information transmission device that transmits and receives optical signals between the end of a hoistway and a car, and is installed in the car, and includes arbitrary information. Transmitting means for converting the optical signal into an optical signal, transmitting means installed at the end of the hoistway, receiving means for receiving the optical signal transmitted by the transmitting means and converting it back to the original information, and the car And a control means for controlling the transmission level of the optical signal by the transmission means based on the information on the car position detected by the detection means.
[0009]
According to such a configuration, since the transmission level of the optical signal received by the receiving means is controlled based on the information on the car position of the car where the transmitting means is installed, the transmitting means and the receiving means are raised and lowered by the car. Even if the distance between the two changes, the optical signal can be normally transmitted and received.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of an elevator information transmission device according to a first embodiment of the present invention.
This information transmission apparatus includes a transmitter 5 and a receiver 6 and transmits information such as video by optical communication.
As shown in FIG. 1, a control panel 7 is installed in the elevator machine room, and the hoisting machine 10 is driven by the control of the control panel 7. By driving the hoisting machine 10, the car 1 moves up and down in the hoistway. A security camera 2 is attached to the ceiling of the car 1. In addition, a transmitter 5 is attached to the car 1, and a receiver 6 is installed in the lower part (pit) of the hoistway so as to face the transmitter 5. Reference numeral 12 denotes a transmission direction of an optical signal transmitted from the transmitter 5.
[0011]
The transmitter 5 and the receiver 6 are installed opposite to each other at a place where the signal transmitted from the transmitter 5 can be directly received by the receiver 6 regardless of whether the car 1 is raised or lowered. For example, the transmitter 5 is attached to the outer surface of the car 1, and the receiver 6 is a part corresponding to the extension of the axis of the car 1 with respect to the part where the transmitter 5 is attached, that is, the lower part of the hoistway. (Pit) 9 is installed at a location corresponding to a position directly below the transmitter 5.
[0012]
The transmitter 5 has a function of modulating the video signal output from the security camera 2, converting the modulated electric signal into an optical signal, and transmitting it to the receiver 6 by spatial transmission. The modulation is, for example, luminance modulation in which a sine wave having a predetermined frequency serving as a carrier wave is superimposed on a video signal. The conversion from an electrical signal to an optical signal is realized by a solid state light emitting device such as a visible light emitting diode, an infrared light emitting diode, or a semiconductor laser. These devices are used for radio equipment such as a television, an audio-related remote controller, or a wireless LAN. The receiver 6 has a function of receiving the optical signal transmitted from the transmitter 5 and reconverting it into the original electrical signal.
[0013]
The conversion from the optical signal to the electric signal is realized by, for example, an avalanche photodiode or a PIN diode. Then, the receiver 6 demodulates the electrical signal converted from the optical signal by a frequency discriminator (not shown), extracts the video signal, and displays it on the video display 4 by a preamplifier (not shown), for example. The signal is amplified to a necessary level, and this signal is output to the video recording device 3.
[0014]
The video recording device 3 and the video display 4 are installed on a predetermined floor (reference floor 8) in the hoistway. The video recording device 3 stores video information included in the video signal received by the receiver 6 and outputs the video information to the video display 4.
[0015]
The video display 4 displays the video information output from the video recording device 3, that is, the video in the car 1. The control panel 7 has a function of controlling the hoisting machine 10 and a function of detecting the car position of the car 1. The control panel 7 outputs the detected car position information to an indicator (not shown) in the operation panel of the car 1, a hall indicator (not shown) on each floor, and the transmitter 5.
[0016]
The transmitter 5 determines the level of the signal to be output to the receiver based on the car position information output from the control unit 7 and performs output. The level of the signal set here is a level necessary and sufficient to display a normal video on the video display 4 and does not generate heat of the receiver 6.
[0017]
FIG. 2 is a diagram showing an internal configuration of the transmitter 5 shown in FIG.
As shown in FIG. 2, the transmitter 5 includes therein a transmission data memory 50, a transmission intensity setting unit 51, a transmission control unit 52, a current control circuit 53, and a light emitting diode 54.
[0018]
The car position information memory 71 is provided in the control board 7, stores car position information acquired by the control board 7, and outputs the information to the transmission intensity setting unit 51 of the transmitter 5. The transmission strength setting unit 51 sets the level of a signal output from the transmitter 5 according to the car position information output from the car position information memory 71 and outputs this information to the transmission control unit 52. The signal level is specifically the value of the bias voltage of the current control circuit 53.
[0019]
The transmission data memory 50 stores video information output by the security camera 2. The transmission control unit 52 acquires the video information stored in the transmission data memory 50 and outputs this to the current control circuit 53 as a video signal. In addition, the transmission control unit 52 outputs a control signal including information on the signal level output from the transmission intensity setting unit 51 to the current control circuit 53. The current control circuit 53 controls the output level of the video signal according to the control signal from the transmission control unit 52 and outputs this to the modulation circuit 55.
[0020]
The modulation circuit 55 performs the luminance modulation described above on the input video signal, and outputs the modulated electric signal to the light emitting diode 54. As described above, the light-emitting diode 54 is, for example, a visible light-emitting diode or an infrared light-emitting diode, and converts the electrical signal output from the modulation circuit 55 into an optical signal and outputs the optical signal to the receiver 6. Further, instead of the light emitting diode 54, a solid light emitting device such as a semiconductor laser diode may be used.
[0021]
Next, processing of the information transmission apparatus having the configuration shown in FIG. 1 will be described.
First, it is assumed that the video imaged by the security camera 2 is always displayed on the video display 4 via the transmitter 5, the receiver 6 and the video recording device 3.
When the destination floor is designated by the passenger, the control panel 7 raises and lowers the car 1 and also sends the car position information of the car 1, that is, the current floor information of the car 1, to the car position information memory 71. To the transmission intensity setting unit 51 of the transmitter 5. The control panel 7 outputs car position information to the transmission intensity setting unit 51 whenever necessary when the floor on which the car 1 is located changes.
[0022]
FIG. 3 is a diagram illustrating an example of a transmission strength table 51a stored in the transmission strength setting unit 51 illustrated in FIG. As shown in FIG. 3, in the transmission intensity table 51a, floor information and information on the transmission intensity of the video signal are stored in association with each other.
[0023]
As the car position of the car 1 increases, that is, as the distance between the transmitter 5 and the receiver 6 increases, the intensity of the optical signal, that is, the signal level required for the video display 4 to output a normal image. In the transmission strength table 51a, as the floor of the car 1 moves from the lowermost floor toward the uppermost floor, the transmission intensity increases, for example, the square of the distance from the lowermost floor. Information of transmission intensity that is continuously proportional is set. That is, transmission intensity “e” <“d” <“c” <“b” <“a”. The transmission intensity associated with each floor information is an intensity that is necessary and sufficient for the video image captured by the security camera 2 to be normally displayed on the video display 4 and that does not cause an overcurrent state in the receiver 6. .
[0024]
Note that the transmission intensity information associated with the floor information stored in the transmission intensity table 51a shown in FIG. 3 includes the intensity necessary for normal display of the video on the video display 4 as described above, and If the receiver 6 has an intensity that does not cause an overcurrent state, a plurality of pieces of floor information are associated with common transmission intensity information. For example, floor information “first floor”, “second floor”, and “third floor” In contrast, the transmission intensity “f” may be associated with the floor information “4th floor” and “5th floor” so that the transmission intensity “g” that is stronger than the transmission intensity “f” is associated with the floor information “4th floor”. .
[0025]
The transmission intensity setting unit 51 collates the car position information acquired from the car position information memory 71 with the transmission intensity table 51 a, reads out the transmission intensity information corresponding to the car position information, and outputs this to the transmission control unit 52. . For example, when the car position information acquired via the car position information memory 71 of the control panel 7 is “3rd floor”, the transmission intensity “c” corresponding to this is read and this information is read. Is output to the transmission control unit 52.
[0026]
The transmission control unit 52 controls the intensity of the current output by the current control circuit 53 according to the transmission intensity information output by the transmission intensity setting unit 51. When the intensity of the current controlled by the current control circuit 53 changes, the intensity of the electric signal output by the modulation circuit 55 changes, so that the intensity of the optical signal output by the light emitting diode 54 also changes. That is, since the transmitter 5 can change the level of the video signal according to the floor information acquired by the control panel 7, it can change the intensity of the optical signal output to the receiver 6.
[0027]
According to such a configuration, the intensity of the optical signal output from the transmitter 5 to the receiver 6 can be changed to an appropriate intensity according to the current car position of the car 1, so that the car 1 can be moved up and down. Even if the distance between the transmitter 5 and the receiver 6 changes, the optical signal is strong enough to display a normal video on the video display 4 and does not cause an overcurrent state on the receiver 6 side. Can always be transmitted.
[0028]
FIG. 4 is a diagram showing a modification of the configuration of the elevator information transmission apparatus shown in FIG.
In the information transmission apparatus shown in FIG. 4, unlike the configuration shown in FIG. 1, the video display 4 is attached in the car 1, and this is connected to the receiver 6. The receiver 6 is attached to the side surface of the car 1. The transmitter 5 is installed in the lower part 9 of the hoistway.
[0029]
Further, a video transmitter 11 is installed outside the elevator, and is connected to the transmitter 5. The video transmitter 11 is, for example, a PC (personal computer). Video information to be displayed on the video display 4 in the car 1 is recorded in the video transmitter 11. This video information is output to the transmitter 5 as a video signal by the operation of the video transmitter 11. The transmitter 5 modulates and electro-optically converts the video signal output from the video transmitter 11 and outputs it to the receiver 6. The video transmitter 11 is not limited to video information, and may be configured to output text information or audio information, for example.
[0030]
The internal configuration of the transmitter 5 shown in FIG. 4 is almost the same as that shown in FIG. However, the data stored in the transmission data memory 50 is supplied by the video transmitter 11 (see FIG. 4).
[0031]
(Second Embodiment)
Next, a second embodiment of the present invention will be described.
FIG. 5 is a diagram showing a configuration around the transmitter 5a according to the second embodiment of the present invention.
The configuration of the elevator information transmission apparatus according to the present embodiment is basically the same as that shown in FIG. 1, and therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.
In the present embodiment, a transmitter 5a is used instead of the transmitter 5 shown in FIG. The transmitter 5a has a laser diode 58, and the intensity of the laser beam (optical signal) 59 output from the laser diode 58 is constant. The laser beam 59 has a function of changing the directivity.
[0032]
An optical mechanism 60 for changing the directivity of the laser beam 59 is provided for the transmitter 5a. The optical mechanism 60 includes a diaphragm 56a and a moving lens 56b. Further, the transmitter 5 a is provided with a diaphragm & lens driving circuit 56 and a data transmission driving circuit 57. The laser beam 59 is diffused as shown in FIG. 5, and the diffusion angle increases in proportion to a decrease in the distance between the laser diode 58 and the moving lens 56b. The diaphragm & lens driving circuit 56 controls the driving of the optical mechanism 60, that is, the open state of the diaphragm 56a and the position of the moving lens 56b. As a result, the directivity of the laser beam 59 is changed.
[0033]
The data transmission drive circuit 57 includes a circuit for acquiring a video signal output by the security camera 2, modulating the luminance of the video signal, and outputting the modulated electric signal to the laser diode 58. .
[0034]
The diaphragm & lens drive circuit 56 sets the diaphragm 56 a to a predetermined open state and moves the moving lens 56 b along the irradiation direction of the laser beam 59 according to the car position information acquired from the car position information memory 71. Reference numeral 56 b-2 shows an example of a state in which the moving lens 56 b is brought close to the light source, that is, the laser diode 58 along the direction of the arrow A.
[0035]
By controlling the diaphragm 56a and the moving lens 56b, the intensity of the laser beam 59 received by the receiver 6 is sufficient to display a normal image on the image display 4 and does not cause an overcurrent state in the receiver 6. Control to become. The details of the driving mechanism of the diaphragm 56a and the moving lens 56b can be the same as those used in a photographic machine and the like, and the description thereof will be omitted.
[0036]
The operation of the transmitter 5a configured as described above will be described. For example, when the car 1 (see FIG. 1) moves from the upper floor to the lower floor and the distance between the transmitter 5a and the receiver 6 becomes short, the directivity of the laser beam 59 is changed. It is necessary to change the amount of light per unit area of the optical signal in the receiver 6 before the movement of the car 1, that is, compared to the case where the distance between the transmitter 5a and the receiver 6 is long. The diaphragm & lens drive circuit 56 determines the open state of the diaphragm 56a and the position of the moving lens 56b according to the car position information acquired by the car position information memory 71. The moving lens 56b is moved closer to the laser diode 58 to diffuse the laser beam 59, and the degree of opening of the diaphragm 56a is reduced. Reference numeral 59-2 shows an example of a state in which the moving lens 56b is brought close to the laser diode 58 and the laser beam 58 is diffused.
[0037]
Further, when the car 1 moves from the lower floor to the upper floor and the distance between the transmitter 5a and the receiver 6 increases, the amount of light per unit area of the laser beam 59 is transmitted. Since the distance between the machine 5a and the receiver 6 needs to be increased as compared with a short distance, the moving lens 56b is moved away from the laser diode 58 to reduce the diffusion angle of the laser beam 59, and the aperture 56a is opened. Increase the degree. As a result, the output intensity of the optical signal from the laser diode 58 is kept constant, that is, the amount of the optical signal received by the receiver 6 can be controlled, so that the intensity of the optical signal received by the receiver 6 is controlled. can do. The configuration of the transmitter 5a as shown in FIG. 5 is naturally applicable to the information transmission apparatus shown in FIG.
[0038]
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.
[0039]
【The invention's effect】
As described above, according to the present invention, the transmission level of the optical signal output from the transmitter to the receiver is changed to an appropriate intensity according to the current car position of the car. Even if the distance between the transmitter and the receiver changes, the optical signal can be normally transmitted and received.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of an elevator information transmission apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing an example of an internal configuration of a transmitter 5 shown in FIG.
3 is a diagram showing an example of a transmission strength table 51a stored in a transmission strength setting unit 51 shown in FIG.
FIG. 4 is a view showing a modification of the elevator information transmission apparatus shown in FIG. 1;
FIG. 5 is a diagram showing a configuration around a transmitter 5a according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Car, 2 ... Security camera, 3 ... Video recording device, 4 ... Video display, 5, 5a ... Transmitter, 6 ... Receiver, 7 ... Control panel, 8 ... Standard floor, 9 ... Lower part of hoistway ( (Pit), 10 ... hoisting machine, 11 ... video transmitter, 12 ... light signal irradiation direction, 50 ... transmission data memory, 51 ... transmission intensity setting unit, 51a ... transmission intensity table, 52 ... transmission control unit, 53 ... current Control circuit 54 ... Light emitting diode 56 ... Diaphragm & lens drive circuit 56a ... Diaphragm 56b ... Moving lens 57 ... Data transmission drive circuit 58 ... Laser diode 59 ... Laser beam 60 ... Optical mechanism 71 ... Car Location information memory.

Claims (4)

An elevator information transmission device that transmits and receives optical signals between an end of a hoistway and a car,
A transmission means installed in the car, for converting arbitrary information into an optical signal and transmitting it;
A receiving unit installed at an end of the hoistway, receiving the optical signal transmitted by the transmitting unit and reconverting it to the original information;
Detecting means for detecting the position of the car;
An elevator information transmission apparatus comprising: control means for controlling a transmission level of an optical signal by the transmission means based on information on a car position detected by the detection means. An elevator information transmission device that transmits and receives optical signals between an end of a hoistway and a car,
A transmission unit installed at an end of the hoistway, which converts arbitrary information into an optical signal and transmits it;
Receiving means installed in the car and receiving the optical signal transmitted by the transmitting means and reconverting it to the original information;
Detecting means for detecting the car position;
An elevator information transmission apparatus comprising: control means for controlling a transmission level of an optical signal by the transmission means based on information on a car position detected by the detection means. An elevator information transmission device that transmits and receives optical signals between an end of a hoistway and a car,
A transmission means installed in the car, for converting arbitrary information into an optical signal and transmitting it;
A receiving unit installed at an end of the hoistway, receiving the optical signal transmitted by the transmitting unit and reconverting it to the original information;
An optical mechanism for changing the directivity of the optical signal output by the transmission means;
Detecting means for detecting the position of the car;
An elevator information transmission apparatus comprising: control means for controlling driving of the optical mechanism so as to change the directivity of the optical signal based on information on a car position detected by the detecting means. An elevator information transmission device that transmits and receives optical signals between an end of a hoistway and a car,
A transmission unit installed at an end of the hoistway, which converts arbitrary information into an optical signal and transmits it;
Receiving means installed in the car and receiving the optical signal transmitted by the transmitting means and reconverting it to the original information;
An optical mechanism for changing the directivity of the optical signal output by the transmission means;
Detecting means for detecting the position of the car;
An elevator information transmission apparatus comprising: control means for controlling driving of the optical mechanism so as to change the directivity of the optical signal based on information on a car position detected by the detecting means.

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