JP2001322548A - Station monitor and movable platform fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a station monitor being easy in installing work of a transmitter and causing no anxiety about radio interference to passengers on a platform. SOLUTION: This station monitor transmits an image picked up by a camera 16 by radio transmission by the transmitter 15, and receives and displays the image transmitted by the radio transmission by a receiving side device 20 mounted on a train 2. The transmitter 15 is installed by an installing mechanism 17 in a roadway side side surface part 12a of this movable platform fence 11 arranged separately by a prescribed interval d from the roadway side edge part 1a along the roadway side edge part 1a-of the platform 1. Thus, the installing work is largely simplified more than when installing the transmitter in a position seaprate from the platform 1. The transmitter 15 cannot be seen from the passengers on the platform 1 so as not to cause anxiety of the passengers about the radio interference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a station monitoring device capable of confirming an image of a station platform in a train. The present invention also relates to a movable platform fence applicable to the station monitoring device.

[0002]

2. Description of the Related Art In order to ensure the safety of passengers when a train arrives or departs from a platform at a station (hereinafter simply referred to as "platform"), it is essential to grasp the situation of the passengers at the platform. For this reason, station monitoring apparatuses have conventionally been used in which an image of a platform is displayed on a monitor so that a train crew or a station crew can check the passenger status.

[0003] In this station monitoring device, the situation of the platform is imaged by a plurality of cameras, and the captured image is displayed on a monitor installed on the platform. The train crew or the station crew checks the status of the passengers on the platform by looking at the image displayed on the monitor and visually checks the status of the passengers. In addition, the train crew or the station crew checks whether or not the passenger is pinched by the door by further checking whether a so-called door lamp (side light) is turned on or off to further secure safety.

However, the station monitoring device requires a monitor of a relatively large size so that the train crew can check the monitor image. Therefore, a relatively large space is required for the platform as a space dedicated to the monitor. Therefore, there is a problem that it is difficult to effectively use the space of the platform.

Therefore, in recent years, a station monitoring device that displays an image of a platform on a monitor mounted on a train has been used. This type of station monitoring device is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-124035.

FIG. 16 is a conceptual diagram showing the configuration of the station monitoring device disclosed in the above-mentioned publication. This station monitoring device
Platform side lane 1 which is a service line to platform 120
21 is applied to a railway facility having a structure branched off from the main lane 122. This station monitoring device has a plurality of cameras 1
23, a transmitter 124, a receiver 126 and a monitor 127 mounted on a train 125.

Each camera 123 is connected to a platform 120
And images the situation of the platform 120 and transmits the image to the transmitter 124 via, for example, a cable. The transmitter 124 is relatively farther forward than the platform 120 along the train traveling direction (for example, 60
0 m ahead). The transmitter 124 is the camera 1
The radio wave including the image transmitted from the light source 23 is radiated to a predetermined radiation range. More specifically, the transmitter 124
Is, for example, a transmission frequency of 44 GHz and a transmission output of 10 mW
The image is superimposed on a radio wave in the millimeter wave band, and the radio wave is radiated to a limited area around the platform 120.

The receiver 126 has, for example, a reception frequency 44
GHz, and is installed in the leading vehicle of the train 125. The receiver 126 receives the radio wave radiated from the transmitter 124, restores the original image signal from the received radio wave, and transmits the image signal to the monitor 127.
The monitor 127 displays an image corresponding to the transmitted image signal on a display screen. Thereby, the train crew can visually recognize the status of the platform 120 in the train 125.

Reference numeral 128 denotes an overhead wire column for holding an overhead wire for an electric railway. In FIG. 16, an overhead line is representative of an object within a line of sight from the leading end position of the platform 120 to the installation position of the transmitter 124. It is represented.

[0010]

By the way, in order to stably provide images of good quality to train crews, it is necessary to prevent the reception level at the receiver 126 from dropping so much. However, the radio wave in the station monitoring device is a millimeter wave having relatively high straightness, and the transmitter 1
Since 24 is installed relatively far from the platform 120, an obstacle 12 such as an overhead wire pole in the middle thereof is
8, the reception level at the receiver 126 may be significantly reduced.

To cope with this, for example, when installing the transmitter 124, it is conceivable to remove an obstacle 128 between the transmitter 124 and the platform 120. However, in this method, it is necessary to perform a dedicated overhead wire construction only for installing the transmitter 124, and the installation work becomes very large.

Therefore, it is conceivable to install another transmitter 129 at a position close to the platform 120 instead of performing overhead wiring work. More specifically, the transmitter 1 is located at a position slightly away from the most advanced position of the platform 120.
29, and the carrier frequency of the transmitter 129 is set to a value different from the carrier frequency of the transmitter 124 installed relatively far from the platform 120. Further, a receiver that can receive radio waves of both frequencies is prepared as the receiver 126, and a reception signal having a higher reception level is selected.

However, in this configuration, the two transmitters 12
4, 129 are required, which not only complicates the configuration, but also complicates the installation work even if it does not involve overhead wire work, and is therefore not preferred.

As can be said of any of the above configurations, the transmitter 124 has a relatively large size because it is installed relatively far from the platform 120. Thus, the passengers at platform 120 have full visibility of the transmitter. For this reason, there is a fear that the passengers on the platform 120 may be harmful to the human body due to the radio waves emitted from the transmitters 124 and 129, and there is a problem that the passengers lack consideration for the passengers.

In recent years, there has been a tendency for a movable platform fence to be mounted on a platform in order to improve the safety of passengers and to achieve one-man operation by train crews. This movable platform fence is provided with an automatic opening / closing door that is opened only when necessary, such as when getting on or off a train. This movable platform fence is often installed along the track side edge of the platform from the leading edge position to the rearmost position of the platform, so if passengers can reach the rail side of the movable platform barrier, Very rare. The present inventor paid attention to this point, and thought that if the transmitter was installed on the track side of the movable platform fence, all of the above-mentioned problems could be solved.

The present invention has been made in view of the technical background as described above, and is intended to provide a station monitoring device that can easily install a transmitter and does not cause a passenger on a platform to be concerned about radio interference. The purpose is to provide.

It is another object of the present invention to provide a movable platform fence applicable to such a station monitoring device.

[0018]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to transmit an image of a platform of a station taken by a camera wirelessly by a transmitter, and to mount the wirelessly transmitted image on a train. In the station monitoring device for receiving and displaying by the receiving side device, the transmitter includes a movable platform fence provided at a predetermined distance from the track side edge along the track side edge of the platform. It is characterized in that it is installed between the platform and the rail side edge.

The present invention also relates to a movable platform fence installed along a rail-side edge of a platform of a station at a predetermined distance from the rail-side edge. It is characterized by including a mounting mechanism that is provided and attaches a transmitter that emits a radio wave including an image of the platform of the station into a predetermined transmission beam to the side surface of the track side.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is a conceptual diagram showing a configuration of a station monitoring apparatus according to Embodiment 1 of the present invention when viewed from above. This station monitoring device is provided in connection with the platform 1 of the station and the train 2, and secures the safety of the passengers on the platform 1 by checking the status of the platform 1 in the train 2. More specifically, the station monitoring device is installed on the platform 1 and wirelessly transmits an image corresponding to the status of the platform 1.
0, and a receiving device 20 that is mounted on the train 2 and receives and displays an image wirelessly transmitted from the transmitting device 10.

More specifically, the station monitoring device is applied to a railway facility having a movable platform fence 11 for ensuring passenger safety when a train arrives, when a train departs, when a train passes, and the like. Is done. The movable platform fence 11
A predetermined distance d (for example, d = 20 cm) is provided from the line side edge 1a along the line side edge 1a corresponding to the edge of the platform 1 facing the line.

More specifically, the movable platform fence 11
It is a wall having automatic doors at predetermined intervals and having a predetermined height. More specifically, the movable home fence 11 has a home fence main body 12 and a door 13. The home fence main body 12 is configured such that the exterior configuration substantially plate-shaped unit home fence main body 12A is connected to the rail side edge 1 of the platform 1.
are arranged at predetermined intervals along a. The home fence main body 12 composed of the plurality of unit home fence main bodies 12A is substantially perpendicular to the platform 1 and a track side surface portion 12a facing the rail, and a platform side substantially perpendicular to the platform 1 and the platform. 1 and a home-side side surface portion 12b facing inward.

The door 13 is connected to the adjacent unit home fence main body 1.
It is provided so that it can be automatically opened and closed between 2A. Door 13
Are closed, for example, in one or both adjacent unit home fence main bodies 12A.

The station monitoring device is provided with a transmitter 15 for image transmission between the movable platform fence 11 and the rail side edge 1a of the platform 1 to ensure passenger safety. It is intended to simplify the installation work of the transmitter 15 and to eliminate the anxiety of the radio wave of passengers.

The transmitting device 10 includes one transmitter 15,
A plurality of cameras 16 and a transmitter 15 are connected to the movable home fence 1
1 is provided. Camera 16
Is an image of the situation of the platform 1, particularly the situation near the rail side edge 1 a of the platform 1. More specifically, the camera 16 focuses on capturing an image near the door of the train 2 stopped on the platform 1. The camera 16 creates an image signal corresponding to the captured image. In this case, the camera 16 uses an NTSC (National Television) corresponding to a moving image as an image signal.
vision SystemCommittee) Create a signal. Camera 16
Transmits the created image signal to the transmitter 15 via a transmission cable (not shown).

The camera 16 is a CCD (Charge Coup).
led Devices) cameras and the like are applicable. Further, the camera 16 may be capable of capturing a color image or may be capable of capturing a black-and-white image. In addition, camera 1
6 may generate a still image signal instead of an NTSC signal corresponding to a moving image.

The transmitter 15 emits a radio wave of a millimeter wave band (for example, a 44 GHz band) including an image signal provided from the camera 16 at a rated transmission output of 10 mW. More specifically, the transmitter 15 generates an image signal of a frequency corresponding to each camera 16 by modulating a carrier having a different frequency from each other based on image signals transmitted from the plurality of cameras 16. . The transmitter 15
Each image signal created as described above is converted into a radio wave and emitted. Therefore, the number of wireless channels of the transmitter 15 is the same as the number of cameras 16.

The radio wave emission range (hereinafter referred to as "transmission beam") B of the transmitter 15 is set at a relatively narrow angle so that the reception side device 20 mounted on the train 2 can receive radio waves at a pinpoint. More specifically, the angle of the transmission beam B is set to about 14 degrees. The angle of the transmission beam B is set to an appropriate value according to the structure of the platform 1, the total length of the train 2, and the like.

The transmitter 15 does not always transmit image signals wirelessly, but transmits image signals wirelessly only under predetermined conditions. The predetermined condition is that the train 2 exists near the platform 1.
Whether or not the train 2 is located near the platform 1 is detected by a home track 30 provided along the track.

More specifically, the home truck 30 is
For example, from a position A (for example, A = 10) m away from the rearmost end of the platform 1 along the track from the foremost end 1a of the platform 1 to B (for example, B
= 10) m. The home track 30 outputs a train detection signal to the transmitter 15 when the train 2 is located at the laying position of the home track 30. The transmitter 15 wirelessly transmits the image signal only when receiving the train detection signal.

With this configuration, the transmitter 15 wirelessly transmits an image signal only before the train 2 arrives at the platform 1 and immediately before the train 2 departs from the platform 1. That is, the transmitter 15 wirelessly transmits the image signal only when necessary. Therefore, the image signal is not transmitted needlessly, and the power consumption of the transmitter 15 can be minimized.

The transmitter 15 is directly mounted on the rail side surface 12a of the movable platform 11 by the mounting mechanism 17. More specifically, the transmitter 15 is attached to the track side surface 12a of the movable platform fence 11 so as to be located between the movable platform 11 and the track side edge 1a of the platform 1. I have. In this case, the transmitter 1
5 is attached to a position lower than the upper end of the movable platform fence 11. In other words, the transmitter 15 is attached to the movable platform fence 11 so as to be invisible to the passengers on the platform 1 on the platform side (opposite to the railroad track) of the movable platform fence 11. This prevents the passenger from seeing the transmitter 15 when waiting for the train.

Further, the transmitter 15 is a movable home fence 11.
And a track side end portion 1a of the platform 1, and is attached to a track side surface portion 12a near the foremost end portion 1b of the platform 1 along the train traveling direction. Transmitter 1 near the front end 1b of the platform 1
The reason why 5 is provided is that the transmitter 15 cannot be seen from the passenger even while the passenger is getting on and off, and the radio wave is stably emitted to the head of the train 2.

More specifically, the platform 1 usually has a length equal to or greater than the total length of the train 2, and the train 2
Usually, the vehicle is stopped near the center in the longitudinal direction of the platform 1. Therefore, the predetermined range on the front end side and the rear end side of the platform 1 is usually a train non-stop position. Therefore, the non-stop position of the train is a blind spot that is very hard to see by passengers. The receiving device 20 mounted on the train 2 is installed at the head of the train 2. In the first embodiment, paying attention to this point, the transmitter 15 is installed near the forefront portion 1b of the platform 1 so that passengers do not get on and off and can radiate radio waves to the head of the train 2. are doing.

The receiving device 20 comprises a receiver 21 and a monitor 2
2 is provided. The receiver 21 is installed in the driver's room at the head of the train 2. The receiver 21 can receive radio waves in the millimeter wave band (44 GHz band). Therefore, when the train 2 enters the transmission beam B of the transmitter 15, the receiver 21 receives the radio wave radiated from the transmitter 15. The receiver 21 performs processing such as amplification on a received signal corresponding to the received radio wave, and then demodulates the received signal to restore the original image signal. The receiver 21 transmits the restored image signal to the monitor 22 via a transmission cable (not shown) provided in the train 2.

The monitor 22 is installed in the driver's room or the passenger compartment, and displays an image signal transmitted from the receiver 21 on a display screen. The monitor 22 can select a preset channel so that images corresponding to a plurality of channels can be displayed simultaneously or only an image corresponding to one channel can be displayed. Has become.

Further, the receiving device 20 is an automatic driving device (hereinafter referred to as “ATO device”) provided in the train 2.
O: Automatic Train Operation) 23 to realize a so-called image squelch function. AT
The O device 23 automates acceleration / deceleration, meandering, fixed position stop, and the like, and has a function of monitoring the speed of the train 2. The receiving device 20 uses a signal corresponding to the speed of the train 2 measured by the ATO device 23 to display an image on the monitor 22 only when the train is stopped.

More specifically, the speed signal output from the ATO device 23 is supplied to a power supply device 24 built in the receiver 21. The power supply device 24 determines whether or not the train 2 is stopped based on the input speed signal. If the speed signal indicates a value greater than 5 km / h, the train 2 is considered to be in a running state, and the power supply 24 prohibits power supply to the monitor 22. As a result, no image is displayed on the monitor 22 during the train running state.

On the other hand, if the speed signal indicates 5 km / h or less, the train 2 is considered to be in a stopped state.
The power supply device 24 starts supplying power to the monitor 22 in response to the speed signal indicating 5 km / h or less. As a result, the image transmitted from the receiver 21 is displayed on the monitor 22. Thus, since the monitor 22 is driven only when necessary when the train is stopped, wasteful power consumption can be prevented.

As described above, in the first embodiment, the transmitter 15 is installed near the foremost end 1b of the platform 1 to radiate radio waves including images into the relatively narrow transmission beam B, The image is displayed on the monitor 22 in the train 2 only when the vehicle is stopped. As described above, only by monitoring the state of the platform 1 only when the train 2 is stopped, passenger safety can be ensured.

More specifically, in the first embodiment,
It is assumed that there is a movable platform fence 11. The door 13 of the movable platform fence 11 is electrically linked with the door of the train 2, and is opened when the door of the train 2 is opened and closed when the door of the train 2 is closed. Therefore, it is extremely rare for a passenger to intrude on the track side over the movable platform fence 11 before and after the train arrives.

Therefore, only when the train is stopped, the status of the platform 1 can be confirmed with the image, and the safety of the passenger can be ensured. That is, passengers can be secured only by installing the transmitter 15 between the movable platform fence 11 and the rail side edge 1a of the platform 1 and in the vicinity of the leading edge 1b of the platform 1. Can be. Therefore, the images before and after the train arrives in the train 2
There is no need to install multiple transmitters for monitoring within the building.

FIG. 2 is a diagram showing a configuration near the transmitter. 2A, 2B, and 2C are a top view, a front view, and a side view of the above configuration, respectively. The transmitter 15 is directly attached to the movable home fence 11 by an attachment mechanism 17. Transmitter 15
Is a radio wave emitting surface 1 having a rectangular appearance and emitting radio waves.
5a. The radio wave radiating surface 15a is a surface where the opening surfaces of the built-in pyramidal horn antenna face each other.

The mounting mechanism 17 can change the direction of the radio wave radiation surface 15a of the transmitter 15, that is, the direction of the transmission beam B. This is because there are various restrictions on the installation position of the transmitter 15. More specifically, the platform 1 has a different structure depending on where it is installed, such as being installed along a straight line or a curved line. Therefore, depending on the platform 1, the direction in which the receiver 21 in the train 2 can receive radio waves well differs. Also, depending on the platform 1, there is a case where the transmitter 15 can be installed only on the platform going to the opposite side due to the restriction of the installation location. Therefore, in these cases, transmit beam B
Needs to be changed.

Furthermore, the total length of the train 2 is not all the same, and there are various types such as six cars and eight cars. in this case,
The train 2 may stop at a different stop position. That is, the distance between the head of the train 2 and the transmitter 15 may change depending on the length of the train 2. For example, there may be a difference of about 40 m between the 6-car and the 8-car. In this case, it is necessary to change the direction of the transmission beam B because the transmission beam B is formed in a relatively narrow range.

The mounting mechanism 17 is provided on a pedestal 40, a support table 41 provided on the pedestal 40, an eave 42 for protecting the transmitter 15 from sunlight, rain, snow, and the like, and provided behind the floor of the platform 1. And a wiring rack 43. The pedestal 40 has a plate shape and is fixed horizontally to the rail side surface 12a of the movable platform 11. Support table 41
Is composed of a horizontal support 45 for displacing the transmitter 15 along the horizontal plane, and a vertical support 46 for displacing the transmitter 15 along the vertical plane. The transmitter 15 can change its direction three-dimensionally by being supported by such a support base 41.

More specifically, the support table 45 for horizontal displacement
Has a U-shaped cross section, and has a rectangular bottom surface portion 45a and two side surface portions 45c which are vertically bent from both long side edges 45b of the bottom surface portion 45a. The support base 45 for horizontal displacement is attached to the pedestal 40 so as to be rotatable in a horizontal plane with the bottom surface portion 45a in contact with the pedestal 40.

The support base 46 for vertical displacement is attached to the support base 45 for horizontal displacement so as to be rotatable along the vertical plane. The support base 46 for vertical displacement has a rectangular support surface 46.
a, two side surfaces 46c vertically bent from both long side edges 46b of the support surface portion 46a, and a support surface portion 46c.
a includes a back surface portion 46e bent from the short side edge portion 46d in the opposite direction to the side surface portion 46c.

The transmitter 15 is mounted on the support base 46 for vertical displacement.
Fixed against. More specifically, the transmitter 15
Is a state in which the surface facing the radio wave radiating surface 15a faces the back surface portion 46e of the support base 46 for vertical displacement, the bottom surface is fixed to the support surface portion 46a, and the surface facing the radio wave radiating surface 15a is the rear surface portion. By being fixed to 46e, it is being fixed to the support base 46 for vertical displacement.

A power cable 47 for supplying power to the transmitter 15 and a signal cable 47 for transmitting an image signal to the transmitter 15 extend from the transmitter 15 and are formed on the movable fence 11. The wiring is led to the wiring rack 43 through the wiring hole 48 and finally connected to the power supply source and each camera 16.

FIG. 3 is a perspective view showing the structure of the support base 45 for horizontal displacement, which is partially cut away for convenience of explanation. As described above, the horizontal displacement support base 45 has the bottom surface 45a and the two side surfaces 45c. A bolt hole 45 is provided near one short side edge 45d of the bottom surface 45a.
e is formed. An arc-shaped long hole 45g having a predetermined radius of curvature centered on the bolt hole 45e is formed near the other short side edge 45f of the bottom surface 45a. The horizontal displacement support base 45 is fixed to the pedestal 40 in a state where a bolt is screwed into the bolt hole 45e and the bolt is inserted into the long hole 45g.

When changing the horizontal angle of the transmitter 15,
Loosen the bolt inserted into the long hole 45g of the horizontal displacement support 45, and in this state, remove the horizontal displacement support 45 by the long hole 45g.
And tighten the bolt of the long hole 45g again at the predetermined position. By doing so, the horizontal angle of the transmitter 15, that is, the horizontal angle of the transmission beam B can be changed.

FIG. 4 is a perspective view showing the structure of the support base 46 for vertical displacement. As described above, the vertical displacement support base 46 has the support surface 46a, the two side surfaces 46c, and the back surface 46e. Two bolt holes 46f are formed in the rear part 46e. Back part 4 of each side part 46c
In the vicinity of the short side edge 46g on the opposite side to 6e, a bolt hole 4
6h are respectively formed. Also, each side portion 46c
An arc-shaped long hole 46i having a predetermined radius of curvature centered on the bolt hole 46h is formed in the vicinity of the short side edge 46d on the back surface portion 46e side. The support base 46 for vertical displacement
A bolt is screwed into each bolt hole 46h, and each long hole 4
The bolt 6i is fixed to the support base 45 for horizontal displacement by inserting a bolt.

When changing the vertical angle of the transmitter 15,
The bolts inserted into the elongated holes 46i of the support base 46 for vertical displacement are loosened, and the support base 46 for vertical displacement is
i, and the bolts of each long hole 46i are fastened again at a predetermined position. By doing so, the vertical angle of the transmitter 15, that is, the vertical angle of the transmission beam B can be changed.

FIG. 5 is a sectional view showing the internal configuration of the transmitter 15. The transmitter 15 is a thin rectangular parallelepiped housing 50.
, A power supply unit 51, a plurality of IF modulation units 52, and an antenna unit 53. The housing 50 has a radio wave emitting surface 15a which is one of the six surfaces. The length k of the radio wave emitting surface 15a along the width direction is set relatively short. This depends on the installation position of the transmitter 15, but will be described later in detail.

The power supply unit 51 is built in the lower part of the housing 50 and supplies power to the IF modulation unit 52 and the antenna unit 53. More specifically, the power supply unit 51 receives power supply from a station power supply via a power supply cable (not shown), and converts the power to the IF modulation unit 52.
And so on. The signal cables connected to the cameras 16 are connected to the plurality of IF modulation sections 52 in one-to-one correspondence.

Each IF modulator 13 is provided above the power supply 51 and below the antenna 53. After performing cable compensation and pre-emphasis processing on the image signal transmitted via the signal cable, each IF modulator 13 frequency-modulates the carrier based on the image signal, and outputs an intermediate frequency band (IF band). Create a modulated signal of In this case, each IF modulator 52 creates a modulated signal using a carrier having a unique frequency. Therefore, I
The F modulation unit 52 creates a modulation signal having a different frequency for each image signal of each camera 16 as a whole.
Each IF modulator 52 gives the created modulated signal to the corresponding antenna 53.

The antenna unit 53 is built in the upper part of the IF modulator 52, in other words, in the upper part of the housing 50, and emits a radio wave corresponding to the modulated signal. Antenna unit 53
Has a plurality of millimeter wave sections 53a and a plurality of pyramidal horn antenna millimeter wave sections 53b. The plurality of millimeter wave units 53a are installed near the surface on the opposite side to the radio wave emission surface 15a, respectively multiply and amplify the modulation signal given from the IF modulation unit 52, and then convert the modulation signal to a pyramidal It is supplied to the horn antenna 53b.

Each of the pyramidal horn antennas 53b is provided so that the opening surface thereof faces the radio wave radiating surface 15a of the housing 50. Pyramidal horn antenna 53b
Radiates a radio wave corresponding to the supplied modulation signal from the aperture surface. Thus, the transmitter 15 can radiate a radio wave corresponding to the image captured by each camera 16 from the radio wave radiation surface 15a.

As described above, the antenna section 53 is
Built in at the top. Therefore, the antenna unit 53
And the receiver 21 mounted on the train 2 is less likely to have an angle. In other words, the transmission beam B can be directed to the receiver 21 without tilting the radio wave radiation surface 15a too much. Therefore, the transmitter 15 does not need to be tilted too much. Therefore, the transmitter 15 can be installed in a more normal state, that is, a state where the transmitter 15 is not tilted too much.

Next, the width k of the radio wave emitting surface 15a will be described in detail. As described above, the transmitter 15 is a movable home fence 1
1 and a rail-side edge 1 a of the platform 1, and is attached to the rail-side surface 12 a of the movable platform fence 11. The distance d between the movable platform fence 11 and the rail side edge 1a of the platform 1 is usually relatively small, for example, 20 cm. Therefore, the transmitter 15
Must be within the length d. Therefore,
In the first embodiment, a pyramidal horn antenna 53b having a relatively small size is applied as a built-in antenna,
The width k of the housing 50 was set to a length less than the length d between the movable platform fence 11 and the rail side edge 1a of the platform 1 with the horizontal angle of the transmitter 15 set to a predetermined angle. By doing so, the transmitter 15 can be installed between the movable platform fence 11 and the rail side edge 1a of the platform 1 without disturbing the running of the train 2.

As described above, according to the first embodiment,
The transmitter 15 is connected to the track side surface 12a of the movable platform fence 11
Since the transmitter 15 is installed, there is no need to perform a large-scale overhead wiring work when installing the transmitter 15, and the installation work becomes very simple. In particular, when the movable platform fence 11 is newly installed on the platform 1 on which the movable platform fence 11 is not installed, if the station monitoring device is installed at the same time, the transmitter 15 and the movable platform fence 11 are installed together. Since the installation can be performed, the installation work is further simplified.

Further, the transmitter 15 is connected to the movable platform fence 11.
And between the rail 1 and the track side edge 1a of the platform 1 and near the foremost end 1b of the platform 1. In other words, the transmitter 15 is connected to the movable platform fence 1
The transmitter 15 is located between the front end 1 and the track side edge 1a of the platform 1 and at a relatively close front side. Therefore, it is not necessary to install a plurality of transmitters as in the related art. Therefore, the configuration of the transmitting apparatus 10 can be simplified.

In addition, since the transmitter 15 is invisible to the passengers of the platform 1 by the movable platform fence, it is possible to prevent the passengers from feeling anxious about radio interference. In addition, movable platform fence 1
Since the condition of the platform 1 can be confirmed in the train 2 on the premise of the installation of the train station 1, the safety of passengers can be ensured without disposing station staff on the platform 1 more than necessary.
Therefore, one-man operation by train crew can be achieved.

The transmitter 15 is directly mounted on the movable platform 11 by the mounting mechanism 17. Therefore, if the transmitter 15 is also installed when a movable platform fence is newly installed on the platform 1, wiring work for the movable platform fence and the transmitter 15 can be performed collectively. Therefore, installation work of the transmitter 15 can be further simplified.

Further, the transmitter 15 is supported by a support base 41 which is a member independent of the movable home fence 11, and the direction of the transmission beam B can be changed.
Therefore, the transmitter 15 can be installed without complicating the configuration of the movable platform fence 11 side.

Embodiment 2 FIG. 6 is a perspective view showing a configuration near a transmitter according to Embodiment 2 of the present invention. 6, the same reference numerals are used for the same functional parts as in FIG.

In the first embodiment, the movable platform fence 1
In this example, a support table 41 is mounted on a base 40 fixed to the base 1 and the transmitter 15 is fixed thereon. On the other hand, in the second embodiment, the transmitter 15 is attached to the door 60 that is openably and closably attached to the track side surface 12a of the movable platform fence 11.

More specifically, the mounting mechanism 17 includes the door 60
It has. The door 60 is attached to the track side surface 12 a of the movable platform fence 11 via a hinge mechanism 61 so as to be horizontally openable and closable. The door 60 constitutes a part of the track side surface portion 12a of the movable platform fence 11 in the closed state, and can be changed from the closed state to the open state by holding the knob 62 attached to the outer surface. I have. The transmitter 15 is attached to the door 60 such that the radio wave emitting surface 15 a is perpendicular to the outer surface of the door 60. In this case, the transmitter 15 is attached to the door 60 so as to be able to rotate along the surface of the door 60.

The mounting mechanism 17 also includes a position fixing member 63.
It has. The position fixing member 63 is for fixing the opening position of the door 60 to a predetermined position. More specifically, the position fixing member 63 includes the angle member 64 and the arm 6.
5 is provided. The angle member 64 is attached to the inner surface of the door 60, and has a plurality of holes 64a formed at predetermined intervals along the upper side of the door 60. The arm 65 is formed to be elongated, and one end is fixed to the movable home fence 11 and the other end is a hole 64 a of the angle member 64.
It is bent so that it can be engaged. With this configuration, the door 60 is appropriately opened, and the arm 65 is connected to the angle member 6.
The horizontal angle of the transmitter 15 can be adjusted by engaging any one of the plurality of holes 64a.

FIG. 7 is a perspective view for explaining a state in which the transmitter 15 is attached to the door 60. The mounting mechanism 17 further includes a mounting portion 66. The mounting section 66 includes the transmitter 1
5 is attached to the door 60 from the inside of the door 60. More specifically, the attachment section 66 attaches the transmitter 15 to the door 60 so that the transmitter 15 can rotate along the surface of the door 60. More specifically, the mounting portion 66 includes three arc-shaped long holes 66a having a predetermined radius of curvature and bolts 66b. The transmitter 15 is connected to the transmitter 1 through the slot 66.
The transmitter 15 is attached to the door 60 by screwing a bolt 66 b into a bolt hole (not shown) formed in the door 5. With this configuration, the bolt 66b is loosened and the transmitter 1
By moving 5 along the surface of the door 60 and retightening the bolt 66b, the vertical angle of the transmission beam B can be changed.

As described above, according to the second embodiment,
The transmitter 15 is attached to a door 60 which can be opened and closed along a horizontal plane and can be fixed in an open state at a predetermined position so as to be rotatable in a vertical plane. Therefore, the number of components can be reduced as compared with the configuration in which the transmitter 15 is supported by the two support bases 45 and 46 as in the first embodiment.

Third Embodiment FIG. 8 is a perspective view showing a configuration near an angle member according to a third embodiment of the present invention. 8, the same reference numerals are used for the same functional parts as those in FIG.

In the second embodiment, the angle member 64
In this example, the horizontal angle of the transmission beam B is adjusted by forming a plurality of holes 64a and engaging the tip of the arm 65 with any of the holes 64a. On the other hand, in the third embodiment, the plurality of holes 64a are changed to one long hole 64b so that the horizontal angle of the transmission beam B can be adjusted more finely.

More specifically, the angle member 64 includes
A long hole 64b is formed along the horizontal direction. With this configuration, the distal end of the arm 65 is engaged with an arbitrary position of the elongated hole 64b, and in this state, the distal end of the arm 65 is tightened from behind with a nut or the like. By doing so, the transmitter 15 can be fixed at an arbitrary horizontal angle.

As described above, according to the third embodiment,
Since the hole for engaging the distal end of the arm 65 is the long hole 64b, the horizontal angle of the transmitter 15 can be finely adjusted. Therefore, the direction of the transmission beam B can be finely adjusted, so that the receiver 21 mounted on the train 2 can receive radio waves even better.

Embodiment 4 FIG. 9 is a perspective view showing a configuration near a transmitter according to Embodiment 4 of the present invention. In FIG. 9, the same reference numerals are used for the same functional parts as in FIG.

In the second and third embodiments, the long hole 66
The transmitter 15 is attached to the door 60 by inserting a bolt 66b into a. On the other hand, in the fourth embodiment, the transmitter 15 is
Attached to.

More specifically, the mounting mechanism 17 according to the fourth embodiment has a turntable 70. The turntable 70 is arranged inside the door 60 so as to rotate along the surface of the door 60. More specifically, the mounting mechanism 17 rotatably mounts the transmitter 15 on the door 60 by mounting the turntable 70 on the transmitter 15 from inside the door 60. In this case, the position of the turntable 70 is fixed by male screws 71.

When adjusting the vertical angle of the transmission beam B, for example, a station staff removes the male screw 71, turns the turntable 70 by a predetermined angle, inserts the male screw 71, and adjusts the position. Fix it. This makes it possible to adjust the vertical angle of the transmission beam B.

As described above, according to the fourth embodiment,
The vertical angle of the transmitter 15 can be more finely adjusted. Therefore, the direction of the transmission beam B can be finely adjusted in accordance with the installation position of the transmitter 15, so that the receiver 21 mounted on the train 2 can receive radio waves even better.

Further, since the vertical angle of the transmission beam B can be adjusted only by rotating the turntable 70, the bolt 66b is removed and the entire transmitter 15 is moved to adjust the vertical angle of the transmission beam B. The adjustment work is easier than in the cases of (3) and (3).

Embodiment 5 FIG. 10 is a diagram showing a configuration of a position fixing member 63 according to Embodiment 5 of the present invention as viewed from above. 10, the same reference numerals are used for the same functional parts as in FIG.

In the second to fourth embodiments, the case where the angle member 64 and the arm 65 are applied as the position fixing member 63 is taken as an example. On the other hand, in the fifth embodiment, a case where a gas spring 75 with a lock mechanism is applied as the position fixing member 63 is taken as an example.

More specifically, the gas spring 75 is
A fixed portion 75a and a telescopic portion 75b that expands and contracts with respect to the fixed portion 75a are provided. The expansion and contraction portion 75b expands and contracts using the pressure of the high-pressure nitrogen gas as a spring. In the fifth embodiment,
The fixed part 75a is fixed to the movable platform fence 11,
5b is fixed to the inner surface of the door 60.

With this configuration, when the door 60 is moved to an arbitrary open position, the expansion and contraction portion 75b expands and contracts accordingly, and stops by the operation of the lock mechanism. Thereby, the door 60
Can be fixed at any position. Therefore, the horizontal angle of the transmitter 15, that is, the horizontal angle of the transmission beam B can be finely adjusted.

In the above description, the case where the gas spring 75 is applied as the position fixing member 63 is taken as an example. However, as the position fixing member 63, for example, FIG.
As shown in FIG. 1, a foldable stay 80 may be applied. In this configuration, when the door 60 is moved to a predetermined open position, the stay 80 is bent according to the open position, and the door 60 stops in that state. Therefore, even with this configuration, the horizontal angle of the transmitter 15 can be finely adjusted.

Embodiment 6 FIG. 12 is a diagram for describing a configuration near a transmitter according to Embodiment 6 of the present invention. More specifically, FIG.
12A is a diagram of the above configuration viewed from above, FIG. 12B is a diagram of the above configuration viewed from the front, and FIG. 12C is a diagram of the above configuration viewed from the side. 12, the same reference numerals are used for the same functional parts as in FIG.

In the first to fifth embodiments, the support 4
The horizontal angle of the transmission beam B is adjusted by moving the transmitter 15 by placing the transmitter 1 on the door 1 or attaching it to the door 60. On the other hand, in the sixth embodiment,
The horizontal angle of the transmission beam B is adjusted by moving the built-in components of the transmitter 15 with the transmitter 15 itself fixed.

More specifically, the transmitter 15 according to the sixth embodiment includes an antenna housing 85 and a housing mounting member 8.
6 and a knob 87. Antenna housing 85
Is an antenna unit 5 which is a part of a built-in component of the transmitter 15.
3, which houses the millimeter wave portion 53a and the pyramidal horn antenna 53b. More specifically,
The antenna housing section 85 has a built-in box 85a and a stop angle 85b, and houses the antenna section 53 by fixing the antenna section 53 in the built-in box 85a with the stop angle 85b.

The housing mounting member 86 is provided with the antenna housing 8.
5 is attached to the housing 50 so as to be rotatable along the horizontal direction. More specifically, the accommodation section mounting member 8
6 includes two rotation shafts 86a and lock nuts 86b. Each of the rotation shafts 86a is, for example, a hexagonal prism, and is linearly fixed to the upper end surface and the lower end surface of the built-in box 85a. When the built-in box 85a is built in the transmitter 15, each of the rotating shafts 86a passes through the holes 88 formed at the upper end and the lower end of the housing 50 of the transmitter 15, respectively. And extended downward. Each lock nut 86b
Each of the rotating shafts 53a is brought into contact with the inner surface of the housing 50.
It is fitted against.

The knob 87 is for rotating the antenna housing 85 from the outside of the housing 50 via the housing mounting member 86 in the horizontal direction. More specifically, each knob 87 is attached to the tip of each rotation shaft 86a, and can be easily rotated manually along a horizontal plane.

In this configuration, when adjusting the horizontal angle of the transmission beam B, for example, the station staff will
Is installed, the knob 87 is turned horizontally by a predetermined angle. As a result, the rotation shaft 86a also rotates by the same angle, and the built-in box 85 also rotates.
a also rotates by the same angle. As a result, the antenna unit 53
Rotates by a predetermined angle along the horizontal direction. Thus, the horizontal angle of the transmission beam B can be adjusted.

The housing 50 of the transmitter 15 rotates along the surface of the door 60 with respect to the door 60 attached to the movable home fence 11 so as to be openable and closable as in the second embodiment. Mounted as possible. Thereby, the transmitter 15 itself can be rotated along the vertical plane. Therefore, the vertical angle of the transmission beam B can be adjusted.

As described above, according to the fourth embodiment,
The horizontal angle of the transmission beam B can be adjusted by rotating the antenna unit 53 built in the transmitter 15 in a horizontal plane. Therefore, the position fixing member 63 for fixing the opening position of the door 60 to the predetermined position as in the second to fifth embodiments is unnecessary. Therefore, movable platform fence 11
The configuration on the side can be simplified.

Further, even if the door 60 is not opened, the transmission beam B
The horizontal angle of can be adjusted. Therefore, dust and the like do not enter the inside of the door, and anxiety of station staff and the like due to the door 60 being left open can be wiped out.

Seventh Embodiment FIG. 13 is a conceptual diagram showing an internal configuration when a transmitter 15 according to a seventh embodiment of the present invention is viewed from above. FIG.
, The same reference numerals are used for the same functional parts as in FIG.

In the sixth embodiment, the accommodation portion mounting member 8
As an example 6, a case where a rotation shaft 86a and a lock nut 86b are applied is taken. On the other hand, in the seventh embodiment, the worm gear 90
Is applied as an example.

More specifically, the housing mounting member 86 according to the seventh embodiment includes a worm gear 90 and a transmitter 1.
5 is a first rotating shaft 9 rotatably provided along the width direction.
1 and a second rotation shaft 92 provided rotatably along the height direction of the transmitter 15.

The worm gear 90 converts the rotation along the vertical plane into the rotation along the horizontal plane, and thereby rotates the built-in box 53a in which the antenna unit 53 of the transmitter 15 is built along the horizontal direction. is there. More specifically, it has a worm wheel 90a and a worm 90b. The worm wheel 90a is fixed to the first rotation shaft 91. The worm 90b is fixed to the second rotation shaft 92. Worm wheel 90a and worm 9
0b are meshed with each other.

The first rotating shaft 91 is connected to the housing 50 of the transmitter 15.
And is extended to the outside of the housing 50 through a hole 93 formed in a side surface opposite to the movable home fence 11. A knob 94 is attached to the tip of the first rotation shaft 91. Second rotating shaft 9
2 is rotatably attached to the upper surface and the lower surface of the transmitter 15. The built-in box 85a is fixed to the second rotation shaft 92.

In this configuration, when the knob 94 is turned, the first turning shaft 91 is turned, and the worm wheel 90a is turned in conjunction with this. Then, the rotation of the worm wheel 90a is transmitted to the worm 90b, and the worm 90b rotates together with the second rotation shaft 92. As a result, the built-in box 85a rotates together with the rotation of the second rotation shaft 92. By doing so, the built-in box 8
5a can be rotated and fixed along the horizontal direction. Therefore, the horizontal angle of the transmission beam B can be adjusted.

The housing 50 of the transmitter 15 is rotatable along the surface of the door 60 on a door 60 attached to the movable home fence 11 so as to be openable and closable as in the second embodiment. Installed. Thereby, the transmitter 1
5 itself can be rotated along a vertical plane. Therefore, the vertical angle of the transmission beam B can be adjusted.

As described above, according to the seventh embodiment,
Since the worm gear 90 is used as the housing attachment member 86, the built-in box 85a can be rotated with a smaller force than in the case of Embodiment 6, and the burden on the user can be reduced.

Eighth Embodiment FIG. 14 is a diagram showing a configuration near a transmitter according to an eighth embodiment of the present invention. More specifically, FIG.
0 shows a state in which the door 60 is closed, and FIG. 14B shows a state in which the door 60 is opened. 14, the same reference numerals are used for the same functional parts as in FIG.

In the sixth and seventh embodiments, the horizontal angle of the transmission beam B is adjusted by rotating only the antenna unit 53 without opening the door 60. On the other hand, in the eighth embodiment, the horizontal angle of the transmission beam B is adjusted by rotating the housing 50 itself without opening the door 60.

More specifically, the mounting mechanism 17 according to the sixth embodiment includes a pair of frames 100 rotatably mounted on the door 60 along the surface of the door 60.
And a column 101 rotatably attached to the pair of frames 100, and a knob 102 fixed to the upper end of the column 101.

The frame 100 is a thin bar, and is attached to the door 60 so as to protrude vertically from the surface of the door 60 and to be spaced apart from the transmitter 15 by a distance equal to or greater than the height of the transmitter 15. The support column 101 is attached to the pair of frames 100 so as to be rotatable along a horizontal plane, and
The transmitter 15 is fixed to a housing 50. With this configuration, when the column 101 is rotated by holding the knob 102, the transmitter 15 is also rotated. As a result, since the transmitter 15 can be rotated in a horizontal plane, the horizontal angle of the transmission beam B can be adjusted.

The frame 100 is attached to the door 60 by bolts 103 from inside the door 60. More specifically, two arc-shaped long holes 104 having a predetermined radius of curvature are formed in the door 60.
The bolt 103 is screwed into a bolt hole (not shown) formed in the frame 100 through the
00 is attached to the door 60. With this configuration,
After loosening the bolt 103, the frame 100, the support 101
Then, the transmitter 15 and the like can be moved along the elongated hole 104, and then the bolt 103 can be tightened. As a result, since the transmitter 15 can be rotated along the surface of the door 60, the vertical angle of the transmission beam B can be adjusted.

As described above, according to the eighth embodiment as well, the horizontal angle of the transmission beam B can be adjusted without leaving the door 60 open. And the like, and the anxiety of station staff etc. due to the door 60 being left open can be wiped out.

Ninth Embodiment FIG. 15 is a diagram showing a configuration near a transmitter according to a ninth embodiment of the present invention. 15, the same reference numerals are used for the same functional parts as in FIG.

In the first to eighth embodiments, the transmitter 1
5 is attached to the movable platform fence 11 directly. On the other hand, the ninth embodiment exemplifies a case where the transmitter 15 is mounted in the vicinity of the movable platform fence 11.

More specifically, the mounting mechanism 17 according to the ninth embodiment includes the movable side side fence 11 of the movable home fence 11.
A pedestal 110 is provided on the platform 1 between the platform 2a and the rail side edge 1a of the platform 1. That is, the mounting mechanism 17 according to the ninth embodiment.
Has only a pedestal 110 installed on the platform 1 instead of the pedestal 40 fixed to the movable platform fence 11 in the first embodiment, and other configurations are the same as those of the first embodiment. is there. That is, the horizontal movement support 45 is mounted on the pedestal 110 so as to be rotatable in the horizontal plane, and the vertical movement support 46 is mounted on the horizontal movement support 45 so as to be rotatable in the vertical plane. The transmitter 15 is mounted on the vertical moving support 46.
Has been fixed.

As described above, in the seventh embodiment, the transmitter 15 is mounted very close to the movable home fence 11. To explain this point in detail, the interval between the transmitter 15 and the movable home fence 11 is an extremely short interval that does not hinder the rotation when the transmitter 15 is rotated in the horizontal direction. Therefore, by installing the transmitter 15, the train 2
There is no hindrance to the running.

As described above, according to the ninth embodiment,
Since the transmitter 15 is mounted very close to the movable platform fence 11, the station monitoring device can be easily installed on the platform 1 on which the movable platform 11 is installed in advance.

Other Embodiments Embodiments of the present invention have been described above.
The present invention is not limited to the above embodiment. For example, in the above embodiment, both the horizontal angle and the vertical angle of the transmission beam B can be adjusted. However, the horizontal angle and the vertical angle of the transmission beam B depend on the installation location of the transmitter 15 and the length of the train. Needless to say, only one of them may be adjusted.

[0118]

As described above, according to the present invention, the transmitter is installed between the movable platform fence and the rail side edge of the platform. No overhead wiring work is required. Therefore, the installation work can be greatly simplified. In addition, since it is not necessary to install a plurality of transmitters for transmitting the status of one platform to the train, the configuration of the station monitoring device can be simplified. In addition, the movable platform fence makes it very unlikely that the transmitter will be in the passenger's eyes, thereby eliminating passengers' concerns about radio interference.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a configuration of a station monitoring device according to Embodiment 1 of the present invention as viewed from above.

FIG. 2 is a diagram showing a configuration near a transmitter.

FIG. 3 is a perspective view showing a configuration of a support base for horizontal displacement.

FIG. 4 is a perspective view showing a configuration of a support base for vertical displacement.

FIG. 5 is a conceptual diagram showing an internal configuration of a transmitter.

FIG. 6 is a diagram showing a configuration near a transmitter according to Embodiment 2 of the present invention.

FIG. 7 is a diagram showing a configuration near a transmitter according to Embodiment 2 of the present invention.

FIG. 8 is a diagram showing a configuration of an angle member according to Embodiment 3 of the present invention.

FIG. 9 is a diagram showing a configuration near a transmitter according to Embodiment 4 of the present invention.

FIG. 10 is a diagram showing a configuration as viewed from above of a position fixing member according to Embodiment 5 of the present invention.

FIG. 11 is a diagram showing a configuration viewed from above of another configuration example of the position fixing member.

FIG. 12 is a diagram showing a configuration near a transmitter according to Embodiment 6 of the present invention.

FIG. 13 is a diagram showing an internal configuration of a transmitter according to Embodiment 7 of the present invention as viewed from above.

FIG. 14 is a perspective view showing a configuration near a transmitter according to Embodiment 8 of the present invention.

FIG. 15 is a diagram showing a configuration near a transmitter according to Embodiment 9 of the present invention.

FIG. 16 is a conceptual diagram showing a configuration of a conventional station monitoring device viewed from above.

[Explanation of symbols] 1 platform, 1a track side edge, 2 trains,
11 Movable platform fence, 12a Track side, 15
Transmitter, 16 camera, 17 mounting mechanism, 20 receiving device, 40 pedestal, 41 support, 53 antenna, 6
0 door, 63 position fixing member, 66 mounting part, 70 turntable, 75 gas spring, 80 stay, 8
5 antenna housing, 86 housing mounting member, 87 knob, 90 worm gear, 100 frame, 101
Post, 102 knob, 103 bolt, 104 slot, 1
10 pedestals.

Claims (7)

[Claims] 1. A station monitoring device that wirelessly transmits an image of a platform of a station captured by a camera by a transmitter and receives and displays the wirelessly transmitted image by a receiving device mounted on a train, The transmitter is provided between a movable platform fence provided at a predetermined distance from the track side edge along the track side edge of the platform and the track side edge of the platform. A station monitoring device, characterized in that: 2. The mounting mechanism according to claim 1, wherein the transmitter is mounted on a rail side surface of the movable platform fence, or the transmitter is mounted on a platform near the rail side surface of the movable platform fence. A station monitoring device, further comprising: 3. The transmitter according to claim 1, wherein:
A station monitoring device that emits a radio wave including an image captured by the camera into a predetermined transmission beam, and wherein the mounting mechanism can change the direction of the transmission beam of the transmitter. 4. The pedestal according to claim 3, wherein the pedestal is fixed to a track side surface of the movable platform fence, and the pedestal is mounted on the pedestal so as to be displaceable along a horizontal plane and / or a vertical plane. A station monitoring device, wherein the transmitter is fixed to the support base. 5. The mounting mechanism according to claim 3, wherein the door is attached to the rail side surface of the movable platform fence so as to be openable and closable along a horizontal plane, and the opening position of the door is fixed at a predetermined position. A station monitoring device, comprising: a position fixing means for mounting the transmitter; and a mounting means for attaching the transmitter to the door so as to be displaceable along a vertical plane. 6. The transmitter according to claim 3, wherein the transmitter comprises: a housing;
An antenna accommodating portion that is housed in the housing and accommodates an antenna portion that forms a transmission beam; a housing attaching member that attaches the antenna accommodating portion to the housing so as to be displaceable along a horizontal plane; A knob for displacing the antenna housing along the horizontal plane via a housing mounting member, wherein the mounting mechanism includes a door that is openably and closably mounted on a rail side surface of the movable platform fence. A station monitoring device, comprising: an attachment member that attaches the housing to the door so as to be displaceable along a vertical plane. 7. A movable platform fence installed along a track-side edge of a station platform at a predetermined distance from the track-side edge, provided on a track-side side face facing the track, A movable platform fence, comprising: a mounting mechanism for mounting a transmitter for radiating a radio wave including an image of the platform into a predetermined transmission beam on the side surface of the track side.