WO2014139160A1 - 一种地铁列车隧道投影系统 - Google Patents

一种地铁列车隧道投影系统 Download PDF

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Publication number
WO2014139160A1
WO2014139160A1 PCT/CN2013/072727 CN2013072727W WO2014139160A1 WO 2014139160 A1 WO2014139160 A1 WO 2014139160A1 CN 2013072727 W CN2013072727 W CN 2013072727W WO 2014139160 A1 WO2014139160 A1 WO 2014139160A1
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Prior art keywords
projection
control unit
tunnel
subway train
unit
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PCT/CN2013/072727
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English (en)
French (fr)
Inventor
冯旋宇
罗艺
Original Assignee
Feng Xuanyu
Luo Yi
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Publication date
Application filed by Feng Xuanyu, Luo Yi filed Critical Feng Xuanyu
Priority to PCT/CN2013/072727 priority Critical patent/WO2014139160A1/zh
Publication of WO2014139160A1 publication Critical patent/WO2014139160A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/22—Advertising or display means on roads, walls or similar surfaces, e.g. illuminated
    • G09F2019/221—Advertising or display means on roads, walls or similar surfaces, e.g. illuminated on tunnel walls for underground trains

Definitions

  • the utility model belongs to the field of subway train additional equipment, in particular to the field of subway train announcement or advertisement playing equipment.
  • the subway As a convenient and convenient means of transportation, the subway is being popularized by more cities. It is also accepted by more citizens. As an operating unit, it can fully utilize its large passenger flow and long spans while it is safe and punctual.
  • the current advertising in the subway station, car and other locations have basically reached saturation, the information obtained by passengers in the car and other information usually comes from the display screen or the flat advertising frame set on the inner wall of the car. The dark tunnel seen through the large glass windows has become the main target for expanding advertising space.
  • the first type is to set a continuous picture suitable for human eyes on the tunnel wall that can be seen on the window, so that passengers can see the animated advertising content in the traveling train, one of which is to arrange the LED light and text.
  • Such a tunnel wall utilization mode has high construction cost and high replacement cost, which is not conducive to widespread promotion defects;
  • the second type is to set up a projection device on the car to project the image onto the tunnel wall.
  • the problem with this type of utilization mode is that the distance between the projection device and the tunnel wall changes during the train travel, that is, the projection focal length changes. A stable and clear picture can not be widely promoted.
  • the utility model provides a subway train tunnel projection system and a projection method, aiming at solving the problem that the projection effect in the prior art is not clear and stable.
  • the present invention provides a subway train tunnel projection system, including a projection unit whose projection surface is a tunnel wall, and a control unit connected to the projection unit, further comprising a connection with the control unit and measurable Distance data of the tunnel wall surface to the projection unit and the data may be transmitted to a distance measuring device of the control unit, the projection unit including a zoom system connected to and controlled by the control unit, The control unit performs calculations to derive data that the zoom system requires to zoom and transmits to the zoom system for zooming.
  • the zoom system includes a micro motor and a zoom lens driven thereby.
  • the micro-motor includes a fixing sleeve, the fixing sleeve is wrapped and fixed on an outer surface of the zoom lens, the outer surface of the fixing sleeve is wound with a coil, and the coil is connected to the control unit, and the fixing sleeve is peripherally a bracket is disposed, the bracket is fixed in the projection unit, the inner surface of the bracket is provided with a permanent magnet in a non-contact state with the fixing sleeve, and the outer wall of the fixing sleeve is provided with at least one sliding rail, At least one end of the slide rail is fixed on the bracket.
  • the coil of the outer surface of the fixing sleeve generates an electromagnetic field and the permanent magnet of the inner surface of the bracket drives the zoom lens to slide on the slide rail.
  • the distance measuring device comprises a ranging transmitting end and a ranging sensing end, and the measuring transmitting end emitting direction is at an angle of 30 degrees to 60 degrees with an outer surface of the subway train compartment, and the ranging sensing end It is provided at the upper or lower part of the projection unit.
  • the ranging transmitting direction of the ranging device is at an angle of 45 degrees to the outer surface of the subway train car.
  • control unit is further connected with an inductive device for identifying the train in and out of the station.
  • the distance measuring device of the present invention measures the distance data of the tunnel wall surface to the projection unit and sends it to the control unit, and the control unit calculates that the zoom system needs to be zoomed.
  • the data is transmitted to the zoom system for zooming, and after the distance measuring device is added, it is ensured that the train can still be clearly and stably projected onto the tunnel wall surface after the distance between the tunnel wall surface and the projection unit changes during the traveling. Without blurring and instability due to changes in focal length.
  • the system provided by the utility model fully utilizes the large-sized windows and tunnels of the subway car to carry out effective dynamic information transmission, and has the advantages of low cost, easy control and good projection effect compared with the prior art.
  • FIG. 1 is a schematic diagram of a system operation process provided by an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a zoom system according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a distance measuring principle of a distance measuring device according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an image sensed by a ranging sensing end against a light spot according to an embodiment of the present invention
  • an embodiment of the present invention provides a subway train tunnel projection system, including a projection unit 1 having a projection surface of a tunnel wall 9, and a control unit connected to the projection unit 1, further comprising a The control unit is connected, can measure distance data of the surface of the tunnel wall 9 to the projection unit 1 and can transmit the data to the distance measuring device 3 of the control unit, the projection unit 1 including the control
  • the zoom system 4, to which the unit is connected and controlled, is calculated by the control unit to derive data that the zoom system 4 needs to zoom and transmit to the zoom system 4 for zooming.
  • the distance measuring device 3 of the present invention measures the distance data of the surface of the tunnel wall 9 to the projection unit 1 and sends it to the control unit, and the control unit calculates the zoom.
  • the system 4 needs zoom data and transmits it to the zoom system 4 for zooming. After the distance measuring device 3 is added, it is ensured that the projection screen can still be projected after the distance between the surface of the tunnel wall 9 and the projection unit 1 changes during the running of the train. Clearly and stably placed on the surface of the tunnel wall 9 without blurring and instability due to changes in focal length.
  • the zoom system 4 includes a micro motor 41 and a zoom lens 42 driven thereby.
  • the micro motor 41 includes a fixing sleeve 401, and the fixing sleeve 401 is wrapped and fixed.
  • the outer surface of the fixing sleeve 401 is wound with a coil 402, the coil 402 is connected to the control unit, and the outer periphery of the fixing sleeve 401 is provided with a bracket 405, and the bracket 405 is fixed to the In the projection unit 1, the inner surface of the bracket 405 is provided with a permanent magnet 403 in a non-contact state with the fixing sleeve 401, and the outer wall of the fixing sleeve 401 is provided with at least one sliding rail 404, and the sliding rail 404 has at least one One end is fixed to the bracket 405.
  • the coil 402 on the outer surface of the fixing sleeve 401 generates an electromagnetic field to interact with the
  • the ranging device 3 includes a ranging transmitting end 31 and a ranging sensing end 32, and the measuring transmitting end 31 emits a direction 30 degrees to the outer surface 8 of the subway train car.
  • An angle a of any angle between 60 degrees, the distance measuring end 32 is provided at the upper or lower part of the projection unit 1, and the distance can be calculated by using an angle of 30 degrees or 60 degrees, on the outer surface of different subway cars. The angle is selected according to the actual situation.
  • the ranging transmission direction of the distance measuring device 3 is at an angle of 45 degrees with the outer surface 9 of the subway train.
  • control unit In order to prevent the projection beam of the projection unit 1 and the beam of the distance measuring device 3 from affecting the passengers of the station, the control unit is also connected with an inductive device for identifying the train in and out of the station, so that the control unit is closed when the train enters and exits the station. And the projection unit 1 and the distance measuring device 3 are activated.
  • an embodiment of the present invention further provides a subway train tunnel projection method, including the above subway train tunnel projection system, and the specific projection method is:
  • the sensing device transmits an environmental signal to the control unit by light brightness or/and electromagnetic or/and infrared sensing the environment in which the train is located;
  • the distance measuring device 3 and the projection unit 1 are activated, and the distance measuring device 3 determines the actual distance A1 between the tunnel wall 9 and the ranging sensing end 32;
  • the actual distance A1 obtained by the distance measuring device 3 is transmitted to the control unit, and the control unit calculates specific data of the zoom system 4 that needs zooming according to the actual distance A1 and controls the zoom system 4
  • the micro-motor 41 moves, and the zoom lens 42 of the micro-motor 41 carries the zoom lens 42 to perform axial movement according to the zoom specific data, so that the image clarity projected by the projection unit 1 is kept in an optimal state;
  • the sensing device transmits an environmental signal to the control unit by light brightness or/and electromagnetic or/and infrared sensing the environment in which the train is located;
  • the control unit turns off the ranging device 3 and the projection unit 1 after receiving the environmental signal.
  • the control unit provided on the subway train starts the ranging device 3 and the projection unit 1 after receiving the environmental signal transmitted by the sensing device, and the ranging device 3 transmits the actual distance A1 to the After the control unit performs zoom processing, the distance measuring device 3 performs real-time ranging during train travel, continuously transmits the actual distance A1 or A2, etc. to the control unit, and the control unit adjusts the focal length in real time.
  • the sensing device is used to sense before entering the station. Turn off to make the entire projection safer and more reliable.
  • the sensing device adopts a light sensor, and when the train leaves the tunnel and enters the station, the light sensor senses the brightness of the light in the station and transmits a signal to the control unit, and the control unit turns off the projection unit 1 and the distance measurement.
  • Device 3 when the train starts to leave the station and enters the tunnel again, the light sensor senses the change of the brightness of the light and transmits a signal to the control unit, the control unit activates the projection unit 1 and the distance measuring device 3;
  • the sensing device uses an electromagnetic sensor, and a trigger device is installed in the tunnel at both ends of the station.
  • the electromagnetic sensor transmits a signal to the control unit after sensing the trigger device, and the control The unit turns off the projection unit 1 and the distance measuring device 3; after the train starts to leave the station and enters the tunnel, the electromagnetic sensor transmits a signal to the control unit after sensing the trigger device, and the control unit activates the projection unit 1 and the distance measurement Device 3;
  • the sensing device adopts an infrared sensor, and an infrared device is installed in a tunnel at both ends of the station.
  • the infrared sensor transmits a signal to the control unit after sensing the infrared device, and the control The unit turns off the projection unit 1 and the distance measuring device 3; after the train starts to leave the station and enters the tunnel, the infrared sensor senses the infrared device and transmits a signal to the control unit, and the control unit activates the projection unit 1 and Distance measuring device 3.
  • the distance measuring device 3 presets that the distance from the distance measuring end 32 to the tunnel wall is a standard value A0, and the end point is a standard point 91, during the train travel.
  • the actual distance A1 between the tunnel wall 9 and the ranging sensing end 32 changes, the light landing point 91a emitted by the ranging transmitting end 31 to the tunnel wall 9 and the standard point 91 generate a distance difference da1.
  • the light landing point 91b emitted by the ranging transmitting end 31 to the tunnel wall 9 and the standard point 91 generate a distance difference da2, which is transmitted through the known ranging transmitting end.
  • control unit sets the focal length of the zoom lens 42 to a standard focal length according to the standard value A0.
  • control unit calculates the zoom lens 42 according to actual data such as the actual distance A1 or A2. The distance of the axial movement and controlling the micro motor 41 to complete the movement of the zoom lens, thereby adjusting the focal length, ensuring the focal length is accurate in real time, and the projection effect is good.

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Abstract

本实用新型提供了一种地铁列车隧道投影系统，包括投影面为隧道壁的投影单元，与所述投影单元相连接的控制单元，还包括一与所述控制单元连接、可测量所述隧道壁表面到所述投影单元的距离数据且可将该数据发送到所述控制单元的测距装置，所述投影单元包括与所述控制单元连接并受其控制的变焦系统，由所述控制单元进行计算得出所述变焦系统需要变焦的数据并传输至所述变焦系统进行变焦，本实用新型所提供的系统，充分利用了地铁车厢大幅车窗及隧道进行有效的动态的信息传播，相比现有技术中具有成本低，易于控制，投影效果好的有益效果。

Description

一种地铁列车隧道投影系统 技术领域
本实用新型属于地铁列车附加设备领域，尤其涉及地铁列车通告或广告播放设备领域。
 背景技术
地铁作为便捷绿色的交通工具，正在被更多的城市普及，也被更多的市民接受乘坐，作为运营单位，安全准时的完成运输任务的同时，也会充分利用其客流量大，跨度长等特点开发其中的可广告资源，目前可以在地铁车站、车厢等位置布置的广告基本已经达到饱和状态，乘客在车厢内所获得的广告等信息通常来自车厢内壁上设置的显示屏或者平面广告框，而通过大幅玻璃窗所看到的漆黑的隧道成为了拓展广告空间的主要目标。
目前现有技术中利用地铁隧道进行广告的方式基本上有两大类：
第一类是在车窗可以看到的隧道壁上设置适合人眼观看的连续图画，使乘客可以在行进的列车中看到动画效果的广告内容，其中有一种是布置LED亮光图文，还有一种是普通图片设置在隧道壁上，通过列车灯光照射使乘客观看，此类隧道壁利用模式具有施工成本高，更换成本高，不利于广泛推广的缺陷；
第二类是在车厢上设置投影设备，向隧道壁进行图像投影，而此类利用模式存在的问题是投影设备与隧道壁的距离在列车行进过程中发生变化，也就是投影焦距发生变化导致无法得到稳定清晰的画面，也无法得到广泛地推广。
 技术问题
本实用新型提供一种地铁列车隧道投影系统及投影方法，旨在解决现有技术中投影效果不清晰稳定的问题。
 技术解决方案
为了解决上述问题，本实用新型提供一种地铁列车隧道投影系统，包括投影面为隧道壁的投影单元，与所述投影单元相连接的控制单元，还包括一与所述控制单元连接、可测量所述隧道壁表面到所述投影单元的距离数据且可将该数据发送到所述控制单元的测距装置，所述投影单元包括与所述控制单元连接并受其控制的变焦系统，由所述控制单元进行计算得出所述变焦系统需要变焦的数据并传输至所述变焦系统进行变焦。
优选地，所述变焦系统包括微动电机及受其驱动的变焦镜头。
优选地，所述微动电机包括固定套，所述固定套包裹固定于所述变焦镜头外表面，所述固定套外表面缠绕线圈，所述线圈与所述控制单元连接，所述固定套外周设有支架，所述支架固定于所述投影单元内，所述支架内表面设有与所述固定套呈非接触状态的永磁体，所述固定套外壁设有至少一根滑轨，所述滑轨至少有一端固定在所述支架上，通电后所述固定套外表面的线圈产生电磁场与所述支架内表面的永磁体作用带动所述变焦镜头在滑轨上滑动。
优选地，所述测距装置包括测距发射端和测距感应端，所述测距发射端发射方向与所述地铁列车车厢外表面呈30度到60度夹角，所述测距感应端设于所述投影单元的上部或者下部。
优选地，所述测距装置的测距发射方向与所述地铁列车车厢外表面呈45度夹角。
优选地，所述控制单元还连接有一识别列车进站及出站的感应装置。
依借上述技术方案，本实用新型所述测距装置将隧道壁表面到所述投影单元的距离数据测量出来后发送到所述控制单元，所述控制单元进行计算得出所述变焦系统需要变焦的数据并传输至所述变焦系统进行变焦，增加测距装置后，保证了列车在行进过程中出现隧道壁表面与所述投影单元距离变化后仍然能够将投影画面清晰稳定的投放到隧道壁表面，而不会因为焦距的变化产生模糊不稳。
 有益效果
本实用新型所提供的系统,充分利用了地铁车厢大幅车窗及隧道进行有效的动态的信息传播，相比现有技术中具有成本低，易于控制，投影效果好的有益效果。
 附图说明
图1是本实用新型实施例提供的系统运行流程示意图；
图2是本实用新型实施例提供的变焦系统结构示意图；
图3是本实用新型实施例提供的测距装置测距原理示意图；
图4是本实用新型实施例提供的测距感应端对着光点所感应的图像示意图；
 本发明的实施方式
为了使本实用新型的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本实用新型进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。
参照图1—3所示，本实用新型实施例提供一种地铁列车隧道投影系统，包括投影面为隧道壁9的投影单元1，与所述投影单元1相连接的控制单元，还包括一与所述控制单元连接、可测量所述隧道壁9表面到所述投影单元1的距离数据且可将该数据发送到所述控制单元的测距装置3，所述投影单元1包括与所述控制单元连接并受其控制的变焦系统4，由所述控制单元进行计算得出所述变焦系统4需要变焦的数据并传输至所述变焦系统4进行变焦。依借上述技术方案，本实用新型所述测距装置3将隧道壁9表面到所述投影单元1的距离数据测量出来后发送到所述控制单元，所述控制单元进行计算得出所述变焦系统4需要变焦的数据并传输至所述变焦系统4进行变焦，增加测距装置3后，保证了列车在行进过程中出现隧道壁9表面与所述投影单元1距离变化后仍然能够将投影画面清晰稳定的投放到隧道壁9表面，而不会因为焦距的变化产生模糊不稳。
进一步地，请参照图2所示，所述变焦系统4包括微动电机41及受其驱动的变焦镜头42，具体地，所述微动电机41包括固定套401，所述固定套401包裹固定于所述变焦镜头42外表面，所述固定套401外表面缠绕线圈402，所述线圈402与所述控制单元连接，所述固定套401外周设有支架405，所述支架405固定于所述投影单元1内，所述支架405内表面设有与所述固定套401呈非接触状态的永磁体403，所述固定套401外壁设有至少一根滑轨404，所述滑轨404至少有一端固定在所述支架405上，通电后所述固定套401外表面的线圈402产生电磁场与所述支架405内表面的永磁体403作用带动所述变焦镜头42在滑轨404上滑动。
另外，请参照图3所示，所述测距装置3包括测距发射端31和测距感应端32，所述测距发射端31发射方向与所述地铁列车车厢外表面8呈30度到60度之间任意角度的夹角a，所述测距感应端32设于所述投影单元1的上部或者下部，采用30度或者60度角度均可以进行距离计算，在不同的地铁车厢外表面根据实际情况选择角度，在本实施例中采用所述测距装置3的测距发射方向与所述地铁列车车厢外表面9呈45度夹角。
为了防止投影单元1的投影光束以及测距装置3的光束对车站候车乘客的影响，所述控制单元还连接有一识别列车进站及出站的感应装置，方便列车进出车站时所述控制单元关闭和启动投影单元1及测距装置3。
参照图1到图4所示，本实用新型实施例另外还提供了一种地铁列车隧道投影方法，包括上述的地铁列车隧道投影系统，具体投影方法为：
所述地铁列车驶入隧道后，由所述感应装置通过光亮度或/和电磁或/和红外感应列车所处环境，向所述控制单元发送环境信号；
所述控制单元接收到环境信号后启动测距装置3及投影单元1，所述测距装置3测定隧道壁9与所述测距感应端32的实际距离A1；
由所述测距装置3将得出的实际距离A1传输给所述控制单元，所述控制单元根据实际距离A1计算出所述变焦系统4需要变焦的具体数据并控制所述变焦系统4中的微动电机41运动，通过所述微动电机41的固定套401携带所述变焦镜头42按照变焦具体数据进行轴向运动，使所述投影单元1所投射的影像清晰度保持最佳状态；
所述地铁列车驶出隧道前，由所述感应装置通过光亮度或/和电磁或/和红外感应列车所处环境，向所述控制单元发送环境信号；
所述控制单元接收到环境信号后关闭测距装置3及投影单元1。
依借上述技术方案，所述地铁列车上设置的控制单元在接收到所述感应装置发送的环境信号后启动测距装置3和投影单元1，所述测距装置3将实际距离A1发送给所述控制单元后进行变焦处理，所述测距装置3在列车行进过程中实时测距，源源不断的将实际距离A1或者A2等等发送给所述控制单元，所述控制单元实时进行调整焦距，保证投影画面清晰稳定投射在地铁隧道壁9表面，供乘客欣赏，同时为了防止列车进站投影光线以及测距装置3的光线对车站站台候车人员照射，通过所述感应装置在进站前进行感应关闭，使整个投影更加安全可靠。
进一步地，所述感应装置采用光传感器，当列车离开隧道进入车站时，由所述光传感器感受车站内光线亮度后将信号传递给所述控制单元，所述控制单元关闭投影单元1及测距装置3；当列车启动离开车站再次进入隧道时，由所述光传感器感受到光线亮度的变化后将信号传递给所述控制单元，所述控制单元启动投影单元1及测距装置3；
或，所述感应装置采用电磁感应器，在车站两端的隧道内安装触发装置，当列车即将进站时，所述电磁感应器感应到触发装置后将信号传递给所述控制单元，所述控制单元关闭投影单元1及测距装置3；当列车启动离开车站进入隧道后，所述电磁感应器感应到触发装置后将信号传递给所述控制单元，所述控制单元启动投影单元1及测距装置3；
或，所述感应装置采用红外感应器，在车站两端的隧道内安装红外装置，当列车即将进站时，所述红外感应器感应到红外装置后将信号传递给所述控制单元，所述控制单元关闭投影单元1及测距装置3；当列车启动离开车站进入隧道后，所述红外感应器感应到所述红外装置后将信号传递给所述控制单元，所述控制单元启动投影单元1及测距装置3。
进一步地，请参照图3和图4所示，所述测距装置3预先设定所述测距感应端32到隧道壁的距离为标准值A0，端点为标准点91，在列车行进过程中当，隧道壁9与所述测距感应端32的实际距离A1发生变化时，所述测距发射端31发射到隧道壁9上的光着落点91a与标准点91产生距离差da1，通过已知测距发射端发射角度a以及标准值A0和距离差da1，采用公式da1=tan（a）×（A0－A1）计算实际距离A1，继续行进过程中，隧道壁9与所述测距感应端32的距离再次产生变化时，实际距离成为A2时，所述测距发射端31发射到隧道壁9上的光着落点91b与标准点91产生距离差da2，通过已知测距发射端发射角度a以及标准值A0和距离差da2，采用公式da2=tan（a）×（A0－A2）计算实际距离A2，以此类推不断进行计算得出行进过程中的实际距离，将实际距离A1或者A2传送到控制单元。
进一步地，所述控制单元按照标准值A0将变焦镜头42的焦距设定为标准焦距，在列车行进过程中，由所述控制单元根据实际距离A1或者A2等等实际数据计算得出变焦镜头42轴向移动的距离并控制微动电机41完成所述变焦镜头的移动，从而调整焦距，保证焦距实时准确，投影效果良好。
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本实用新型的保护范围之内。

Claims (6)

  1. 一种地铁列车隧道投影系统，包括投影面为隧道壁的投影单元，与所述投影单元相连接的控制单元，其特征在于，还包括一与所述控制单元连接、可测量所述隧道壁表面到所述投影单元的距离数据且可将该数据发送到所述控制单元的测距装置，所述投影单元包括与所述控制单元连接并受其控制的变焦系统，，由所述控制单元进行计算得出所述变焦系统需要变焦的数据并传输至所述变焦系统进行变焦。
  2. 如权利要求1所述的地铁列车隧道投影系统，其特征在于，所述变焦系统包括微动电机及受其驱动的变焦镜头。
  3. 如权利要求2所述的地铁列车隧道投影系统，其特征在于，所述微动电机包括固定套，所述固定套包裹固定于所述变焦镜头外表面，所述固定套外表面缠绕线圈，所述线圈与所述控制单元连接，所述固定套外周设有支架，所述支架固定于所述投影单元内，所述支架内表面设有与所述固定套呈非接触状态的永磁体，所述固定套外壁设有至少一根滑轨，所述滑轨至少有一端固定在所述支架上，通电后所述固定套外表面的线圈产生电磁场与所述支架内表面的永磁体作用带动所述变焦镜头在滑轨上滑动。
  4. 如权利要求1所述的地铁列车隧道投影系统，其特征在于，所述测距装置包括测距发射端和测距感应端，所述测距发射端发射方向与所述地铁列车车厢外表面呈30度到60度夹角，所述测距感应端设于所述投影单元的上部或者下部。
  5. 如权利要求4所述的地铁列车隧道投影系统，其特征在于，所述测距装置的测距发射方向与所述地铁列车车厢外表面呈45度夹角。
  6. 如权利要求1-5任一项所述的地铁列车隧道投影系统，其特征在于，所述控制单元还连接有一识别列车进站及出站的感应装置。
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