JP2002308097A - Image transmission device for train - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily transmit an image to the train side without requiring a precise adjustment of the optical axis, and without being influence by a curved shape of a platform. SOLUTION: Telecameras 11a to 11c are installed on the platform 1 of a station, and photograph the platform 1, a front part, a central part, and a rear part of a train 2. A picture signal photographed by the telecameras 11a to 11c is modulated by FM, and is synthesized as a signal of 3 CH, and is inputted to an LED driving device 13. While, the LED driving device 13 is arranged in the forefront part of a platform fence 14, and an LED light transmitter 15 is arranged horizontally long on the side opposed the train 2. A light receiving part 16 arranged outside the forefront part of the train 2 so as to be opposed to a central part of the LED light transmitter 15 when the train 2 stops in a specified position of the platform 1. A light signal from the LED light transmitter 15 is received by the light receiving part 16, and is converted into a high frequency signal. The picture signal of three channels is demodulated by a demodulating circuit, and is displayed on a triple LCD monitor device 18 arranged in a driver's seat of the train 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ITV camera (Industrial Television: Industrial Television Camera) installed on a platform of a station, which monitors the status of passengers on the platform and provides an optical space when a train stops at the platform. The present invention relates to a train-to-train image transmission device that transmits image information from the ground to a train via a transmission device, and displays the image information on a monitor television set in a cab.

[0002]

2. Description of the Related Art In recent years, in a transportation system by train or the like, a TV camera (ITV camera) is installed on a platform of a station, the state of passengers is photographed, the image information is transmitted to a control room, and installed on the platform. The information is displayed on the monitor device installed in the vehicle or on a monitor device installed in the driver's cab, so that the crew can confirm the safety of passengers. In particular, in a one-man type train, it is necessary to display an image of passengers on a monitor device in the driver's cab to confirm the safety of passengers.

In order to display the state of passengers captured by the TV camera on a monitor device installed in the train cab, it is necessary to transmit a signal to a monitor device in a driver's seat using wireless communication.

As an example of the wireless system, a system using an optical space transmission system has been put to practical use. A spatial transmission optical communication device using the optical space transmission system performs optical communication using the atmospheric space as a transmission medium, and inputs signal light output from a light transmitting device to a light receiving device using the atmospheric space as a transmission medium. Then, optical communication is performed.

Conventionally, as shown in FIG. 4, a light transmitting device 3 is installed on a train 2 stopped at a platform 1 so as to be located rearward in the traveling direction of the train 2 and ± 0.3 mm from the light transmitting device 3.
An optical signal is transmitted by a beam 4 having a sharp angle of 4, and the beam 4 is received by a light receiving device 5 installed at the end of the train 2 and is displayed on a monitor device on the vehicle. In this case, the transmission distance of the beam 4 is set to about 250 m at the maximum.

When the platform 1 is curved as shown in FIG. 5, a wide communication area cannot be ensured by only one traveling device. Are installed to secure a signal transmission area.

[0007]

The above conventional light transmitting device needs to transmit a signal with a sharp beam in order to secure a long transmission distance. Therefore, a precise optical lens is used, and a narrow light beam is used. The device must be configured to transmit signals, and there is a problem that precise device adjustment is required. Further, since the light transmission distance of the beam of the light transmission device is long, there is a possibility that the light transmission device may be affected by weather conditions such as sunlight and fog when used outdoors. Furthermore, when the platform is curved or meandering, there is a problem that the number of light transmitting devices increases and the cost increases.

On the other hand, recently, a safety measure has been popularized in which a platform fence is provided on a platform of a station and a gate of the platform fence is opened only when the train is stopped at the platform to enable getting on and off the train.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A light transmitter is provided on a platform fence of a station, and an image of the platform taken by a TV camera is transmitted from the light transmitter to the train side. This eliminates the need for precise optical axis adjustment, and is not affected by the curved shape of the home, etc.
It is an object of the present invention to provide a train image transmission apparatus capable of easily transmitting an image to a train.

[0010]

According to the present invention, there is provided an image transmission apparatus for trains, comprising: a transmitter having a plurality of light-emitting elements provided horizontally at the top of a train rail on a platform rail of a station; A TV camera that captures the situation of the home, a modulating unit that modulates a video signal from the TV camera, and a driving unit that drives the light transmitter with the video signal modulated by the modulating unit. A monitor device provided in the train cab, a light receiving unit provided outside the train facing the light transmitter when the train stops at a fixed position on the platform, and the light transmitter received by the light receiver. And a driving means for demodulating the optical signal from the monitor device and driving the monitor device.

A light transmitter is provided on the platform fence of the station as described above, and the image of the platform taken by the TV camera is transmitted to the train side from the light transmitter, whereby the light is transmitted between the light transmitter and the light receiving unit. Distance can be shortened. This eliminates the need to provide a precision optical lens in the light transmitter, thus eliminating the need for precise equipment adjustments, and ensures stable transmission of optical signals without being affected by sunlight or fog or other weather conditions. You can do it.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an overall schematic configuration of an image transmission apparatus for trains using the optical space transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a system configuration in the embodiment. 1 and 2, a plurality of, for example, three color TV cameras (IT
V cameras) 11a to 11c are installed by means such as hanging from the ceiling, and the front, center, and
Shoot the rear.

Video signals photographed by the TV cameras 11a to 11c are input to a modulator, for example, an FM modulator 12, as shown in FIG. The FM modulator 12 FM-modulates a video signal captured by the TV cameras 11a to 11c, synthesizes the video signal with a 3CH signal, and inputs the signal to the LED driving device 13. The LED drive device 13 is provided at the head of a platform fence 14 installed on the platform 1 as shown in FIG. In addition, a light transmitter including a plurality of light emitting elements, for example, a continuous multi-stage L
An ED type LED light transmitter 15 is provided horizontally. The LED transmitter 15 is, for example, a 16-row type without a lens, and has a double LED array.

Also, when the train 2 stops at the specified position of the platform 1, the LED transmitter 1
The light receiving unit 16 is arranged so as to face the center of the light receiving unit 5. The transmission range of the optical signal from the LED transmitter 15 to the light receiving unit 16 is set to, for example, about ± 500 mm.

The light receiving section 16 is provided integrally with a light receiving circuit in a light receiving device 17 as shown in FIG. The light receiving device 17 receives the light signal from the LED light transmitter 15 at the light receiving unit 16 and converts it into a high-frequency signal, and demodulates the three-channel video signal by the demodulation circuit. This light receiving device 1
The video signal demodulated in 7 is sent to a monitor device provided in the driver's seat of the train 2, for example, a triple LCD monitor device 18 and displayed.

Next, the overall operation of the train-to-train image transmission apparatus configured as described above will be described. When the train 2 stops at the prescribed position of the platform 1, the light receiving unit 1 provided at the head of the train 2
6 faces the LED transmitter 15 provided on the platform fence 14. In this case, the LED transmitter 15 is formed to be horizontally long using the continuous multi-stage LED system, and the transmission range of the optical signal is set to a predetermined range in the horizontal direction with respect to a specified stop position, for example, a range of ± 500 mm. Therefore, the optical signal can be transmitted without any problem even if the train 2 slightly deviates from the prescribed stop position.

On the other hand, the TV camera 1 installed in the home 1
1a to 11c are the front part, the center part of the platform 1 and the train 2,
Take a picture of passengers at the rear. The video signals photographed by the TV cameras 11a to 11c are FM-modulated by the FM modulator 12, and three-channel signals are synthesized and sent to the LED driver 13. The LED driving device 13 drives the LED transmitter 15 based on the high-frequency signal modulated by the FM modulator 12 and transmits the light to the light receiving unit 16 provided in the train 2. The light receiving device 17 installed in the train 2 receives the optical signal sent from the LED transmitter 15 by the light receiving unit 16 and converts it into a high-frequency signal, and further demodulates it into a three-channel video signal. Is output to and displayed on the triple LCD monitor device 18 provided in the LCD monitor. Accordingly, the driver of the train 2 is
By monitoring the image displayed on the D monitor device 18, it is possible to confirm that the train door is closed and to confirm the safety of the passengers on the platform 1, and to operate the train 2 safely and smoothly.

(Second Embodiment) Next, a second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 3, two platforms 1a, 1a, 1
b is provided, and the up train 2a and the down train 2b run between the two platforms 1a and 1b in the directions shown by the arrows, and return at the first train station and the last train station. is there.

Each of the trains 2a and 2b has a driver's seat at both ends, and the driver's seat has a triple LCD monitor 1
8 is provided, and a light receiving device 17 having a light receiving unit 16 is provided on the left side of the driver's seat.

An LED light transmitter 15 is provided at the head of the home fence 14 in each of the two platforms 1a and 1b, as in the first embodiment. The other configuration is the same as that of the first embodiment, and a detailed description will be omitted.

As described above, the triple LCD monitor device 18 is provided at each of the driver seats at both ends of each of the trains 2a and 2b, and the light receiving device 17 having the light receiving section 16 is provided at the left side of the driver seat. Accordingly, the light signal transmitted from the LED transmitter 15 provided on the platform fence 14
Light is received by the light receiving unit 16 provided at the head in the traveling direction of a and 2b, and an image of the passenger is displayed on the triple LCD monitor device 18.

Then, even when each of the trains 2a and 2b is turned back at the terminal station, the optical signal transmitted from the LED transmitter 15 installed on the platform fence 14 is transmitted to each of the trains 2a and 2b as in the above case. The light is received by the light receiving unit 16 at the head of the traveling direction, and the image of the passenger is displayed on the triple LCD monitor 18.

In the second embodiment, the case where the up train 2a and the down train 2b run between the two platforms 1a and 1b has been described, but the up train 2a and the down train Even when 2b runs,
Optical signals can be transmitted using the trains 2a and 2b having the system configuration shown in FIG.

[0024]

As described above in detail, according to the present invention, a light transmitter is provided on the platform fence of a station, and an image of the platform taken by the TV camera is transmitted from the light transmitter to the train side. Therefore, the distance between the transmitter and the receiver can be shortened,
For this reason, it is not necessary to provide a precise optical lens in the light transmitter, and precise device adjustment is not required. In addition, since the distance between the light transmitter and the light receiving unit is short, the transmission of the optical signal can always be performed stably without being affected by the influence of weather or weather conditions such as fog. Further, even when the platform is curved or meandering, the light transmitter can be installed on the platform fence to reliably transmit the optical signal to the train. Therefore, there is no need to install a plurality of light transmitting devices, and the device can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall schematic configuration of an image transmission apparatus for trains using an optical space transmission system according to an embodiment of the present invention.

FIG. 2 is an exemplary block diagram showing a system configuration according to the embodiment;

FIG. 3 is a schematic configuration diagram of a train image transmission device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing an example of a case where a light beam is transmitted from behind a vehicle in a conventional light transmitting and receiving device for optical communication.

FIG. 5 is a configuration diagram showing an example in the case where a home is curved in a conventional light transmitting / receiving device for optical communication.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Home 2 Train 2a Up train 2b Down train 11a-11c TV camera 12 FM modulator 13 LED drive 14 Home fence 15 LED transmitter 16 Light receiver 17 Light receiver 18 Triple LCD monitor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B61B 1/02 (72) Inventor Kaoru Suda 3- 14-20 Higashinakano, Nakano-ku, Tokyo Hitachi, Ltd. Kokusai Electric Co., Ltd. MM15 NN10 NN12 5K002 AA01 AA03 BA14 EA05 FA03 GA05

Claims (5)

[Claims] 1. A light transmitter comprising a plurality of light-emitting elements provided horizontally at the head of a train running side of a platform fence of a station, a TV camera provided on the platform of the station and taking a picture of the platform, A modulating means for modulating a video signal from the TV camera, a driving means for driving the light transmitter by the video signal modulated by the modulating means, a monitor provided in a train cab, A light receiving unit provided outside the train facing the light transmitter when the vehicle stops at a fixed position, and a drive for demodulating an optical signal received from the light transmitter from the light transmitter and driving the monitor device. And a means for transmitting an image to a train. 2. A light transmitter including a plurality of light-emitting elements provided horizontally at the head of the platform fence of the station on the train running side, a TV camera provided on the platform of the station and photographing the status of the platform, A modulating means for modulating a video signal from the TV camera, a driving means for driving the light transmitter by the video signal modulated by the modulating means, and a monitor provided in a front cab and a rear cab of the train And a light receiving unit that is provided on the front side and the rear side of the train opposite to the platform and receives an optical signal from the light transmitter when the train stops at a fixed position of the platform, and is received by the light receiving unit. And a driving unit for demodulating the optical signal and driving the monitor device. 3. The train-to-train image transmission apparatus according to claim 1, wherein said modulating means FM-modulates a video signal from a TV camera. 4. The train image transmission apparatus according to claim 1, wherein the light transmitter is of a continuous multi-stage LED type. 5. An LED light transmitter comprising a plurality of LEDs horizontally provided at the head of a train running side of a platform fence of a station, and a front part of the platform and a stopped train provided on the platform of the station. A plurality of TV cameras for photographing the central part and the rear part; FM modulation means for FM-modulating video signals from the TV cameras and outputting as signals of a plurality of channels; and the LE by the video signals modulated by the FM modulation means.
LED driving means for driving the D transmitter, an LCD monitor device provided in the train cab, and a light receiver provided outside the train facing the LED transmitter when the train stops at a fixed position on the platform. And a driving unit for demodulating the light signal from the LED transmitter received by the light receiving unit to a video signal of a plurality of channels and driving the LCD monitor device. Transmission equipment.