WO2019154041A1 - 一种便携式伸缩投影幕布装置 - Google Patents
一种便携式伸缩投影幕布装置 Download PDFInfo
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- WO2019154041A1 WO2019154041A1 PCT/CN2019/072279 CN2019072279W WO2019154041A1 WO 2019154041 A1 WO2019154041 A1 WO 2019154041A1 CN 2019072279 W CN2019072279 W CN 2019072279W WO 2019154041 A1 WO2019154041 A1 WO 2019154041A1
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- telescopic
- frame
- support plate
- fixed support
- projection screen
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Definitions
- the utility model belongs to the technical field of a projection device auxiliary device, in particular to a portable telescopic projection screen device.
- the existing notebook computer mainly includes a display part, a computer main body and a keyboard part, and the display part usually adopts a liquid crystal display screen.
- the size of the liquid crystal screen is about 13 inches.
- the existing notebook computer has been developed to be ultra-thin.
- the rigid LCD screen due to the limitation of the size of the notebook computer by the rigid LCD screen, it is still unable to get rid of the square shape, and the occupied area is still large. It needs to be carried by a computer bag and cannot be done. To be small enough to carry it directly, it still can't meet the requirements of people's portability.
- the Chinese patent discloses a portable projector screen comprising a projection screen and a curtain shaft.
- One end of the projection screen is mounted on the screen shaft, and the screen shaft is vertically connected to the main support rod, and is evenly distributed on the side of the main support rod.
- a plurality of auxiliary support rods are arranged, and a plurality of springs are further connected at the bottom of the main support rods, and each spring is provided with a hook matched with the hanging buckle, and each of the auxiliary support rods can rotate around the connection end with the main support rod,
- a groove body is arranged on the outer wall of each auxiliary support rod, and a buckle is installed in the groove body.
- the patented projector screen can replace the LCD screen when used with the projector.
- the projector screen has its own storage support function, which can be used outdoors without additional support.
- the curtain has good stability and can fold the curtain when not in use. Zoom out.
- the portable projector screen of the above patent adopts a horizontally disposed curtain shaft curling curtain to realize the lifting and lowering of the screen, which is more common. Since the curtain is rectangular and the lateral width is greater than the height, the rigid screen axis is long. After the curtain is closed, the carrying is still inconvenient; in addition, the structure is relatively complicated, and the manual operation and lifting of the screen is required, and the operation is inconvenient and the efficiency is low.
- the structure is simple and compact, and it is easy to carry around after folding; in addition, the operation is convenient, and the curtain lifting efficiency is high. This is an issue that needs to be solved urgently.
- the utility model provides a portable telescopic projection screen device which has a simple and compact structure and is easy to carry around after being folded.
- the operation is convenient and the curtain lifting efficiency is high.
- a portable telescopic projection screen device comprising a rectangular curtain and a curtain telescopic support frame
- the curtain telescopic support frame comprises a fixed support plate and a telescopic frame
- a support base is disposed at a lower end of the fixed support plate
- the telescopic frame is disposed on the fixed support plate
- the left and right ends of the telescopic frame are horizontally extendable and free ends, and the two free ends are vertically disposed
- a root reel the two sides of the rectangular screen are respectively wound on the corresponding reels.
- the telescopic frame is a diamond telescopic frame, an X-shaped telescopic frame or a telescopic rod, and the two free ends of the telescopic frame are provided with a reel mounting outer casing, and the reel is disposed on the reel
- the housing is rotatably connected, and the reel is an elastic rotary shaft.
- a micro motor and a control device are disposed on the fixed support plate or the support base, and the micro motor drives the two free ends of the telescopic frame through a transmission component to synchronously expand and contract, expand or Roll up the rectangular curtain.
- the diamond telescopic frame is symmetrically disposed on the fixed support plate, and the diamond telescopic frame is hinged by an articulated shaft of an intersecting connecting rod and a connecting portion of the connecting rod, the diamond telescopic frame
- the right-handed section of the lower half of the left and right rotating screws is sleeved with a lower thread, and the upper and lower cores are respectively connected with the two hinged shafts in the middle of the diamond-shaped telescopic frame, and a micro motor passes through the flexible a drive shaft is coupled to the left and right rotating screws, and the right and left rotating screws are rotated forward or reverse by the micro motor to rotate forward or reverse to make the two free ends of the diamond telescopic frame synchronously expand and contract, expand or Roll up the rectangular curtain.
- the support base is a leg hinged to a lower portion of the fixed support plate or a long bottom plate hinged to a lower end of the fixed support plate.
- the support base is a long bottom plate hinged with the lower end of the fixed support plate, and the micro motor, the flexible drive shaft, the battery and the control device for powering the micro motor are all disposed in the Said on the long bottom plate.
- the micro motor is a stepping motor.
- the reel of the portable folding projection screen device of the utility model is vertically arranged, and the telescopic frame is a diamond telescopic frame, an X-shaped telescopic frame or a telescopic rod, and the structure thereof is simple and compact, and is easy to carry around after folding;
- the telescopic frame of the utility model is driven by a motor, and the operation is convenient, and the lifting efficiency of the screen is high;
- the support seat of the utility model is a leg hinged to the lower part of the fixed support plate or a long bottom plate hinged to the lower end of the fixed support plate, which is fixed firmly, is easy to carry after folding, and is convenient for adjusting the inclination angle of the screen.
- Embodiment 1 is a perspective view of the back side of Embodiment 1 of a portable telescopic projection screen device of the present invention
- Figure 2 is a perspective view of the back side of the second embodiment of the portable telescopic projection screen device of the present invention
- Figure 3 is a perspective view of the back side of the third embodiment of the portable telescopic projection screen device of the present invention.
- Figure 4 is a front elevational view showing the rear curtain of the portable telescopic projection screen device of the third embodiment of the present invention.
- Figure 5 is a front elevational view of the rear curtain of the third embodiment of the portable telescopic projection screen device of the present invention.
- Figure 6 is a partial schematic view of a portable telescopic projection screen device of the present invention.
- Figure 7 is a side view of the portable telescopic projection screen device of the present invention supported by the legs;
- Figure 8 is a perspective view of a portable telescopic projection screen device of the present invention supported by a long bottom plate;
- Figure 9 is a perspective view showing a state in which the screen of the portable telescopic projection screen device is supported by a long bottom plate after being contracted;
- FIG. 10 is a perspective view showing a state in which the screen of the portable telescopic projection screen device is contracted and the long bottom plate is folded.
- the utility model relates to a portable telescopic projection screen device, which comprises a rectangular curtain 2 and a curtain telescopic support frame.
- the curtain telescopic support frame comprises a fixed support plate 4 and a telescopic frame, and the lower end of the fixed support plate 4 is provided with a support seat and a telescopic frame.
- the fixed support plate 4 is disposed on the left and right ends of the telescopic frame, wherein the left and right ends of the telescopic frame are horizontally retractable, and a reel 12 is vertically disposed on each of the two free ends, and two sides of the rectangular screen 2 are respectively wound on the corresponding reel 12 on.
- a first embodiment of a portable telescopic projection screen device includes a rectangular curtain 2 and a curtain telescopic support frame.
- the curtain telescopic support frame includes a fixed support plate 4 and two telescopic rods 3, The lower end of the fixed support plate 4 is provided with a support seat, and the two telescopic rods 3 are respectively fixed on the left and right sides of the fixed support plate 4, and the outer ends of the two telescopic rods 3 are horizontally retractable free ends, and the two free ends are vertically vertical.
- a reel mounting housing 1 is provided.
- the reel 12 is disposed in the reel mounting housing 1 and is rotatably connected.
- the reel 12 is an elastic rotary shaft, and the torque of the rectangular rectangular fabric 2 is generated by a spring.
- a second embodiment of a portable telescopic projection screen device includes a rectangular curtain 2 and a curtain telescopic support frame.
- the curtain telescopic support frame includes a fixed support plate 4 and two X-shaped telescopic frames 5 .
- a support base is disposed at a lower end of the fixed support plate 4.
- One end of the two X-shaped telescopic frames 5 is inserted into a long slot on a corresponding side of the fixed support plate 4, and the other end of the X-shaped telescopic frame 5 is inserted into a sliding slot on the rotating shaft mounting housing 1.
- the reel 12 is disposed in the reel mounting housing 1 and is rotatably connected, and the reel 12 is an elastic rotary shaft.
- the torque of the rectangular rectangular fabric 2 is generated by a spring.
- a micro motor and a control device may be disposed on the fixed support plate 4 or the support base.
- the micro motor drives the two free ends of the telescopic frame through the transmission component to synchronously expand and contract, and unfold or roll up the rectangular curtain 2.
- the third embodiment of the portable telescopic projection screen device includes a rectangular curtain 2 and a curtain telescopic support frame.
- the curtain telescopic support frame includes a fixed support plate 4 and a diamond telescopic frame 6 at a fixed support.
- the lower end of the plate 4 is provided with a support seat, and the rhombic telescopic frame 6 is symmetrically disposed on the fixed support plate 4.
- the rhombic telescopic frame 6 is hinged by the hinged shaft of the intersecting link and the connecting portion of the link.
- the left and right rotating screws 9 are vertically arranged on the inner side of the fixed support plate 4, and the left-handed segments of the upper half of the left and right rotating screws 9 are sleeved.
- the nut 7 and the right-handed section of the lower half of the left and right rotating screws 9 are sleeved with a lower thread 8 which is connected to the two hinge shafts in the middle of the rhombic telescopic frame 6, respectively.
- the left and right outer ends of the diamond telescopic frame 6 are horizontally extendable free ends, and a reel mounting housing 1 is vertically disposed on each of the two free ends, and the reel 12 is disposed in the reel mounting housing 1 and is rotatably connected, and the reel 12 is Elastic rotary shaft.
- the torque generated by winding the rectangular curtain 2 is generated by a spring.
- a micro motor 11 is connected to the lower end of the left and right rotating screws 9 through the flexible transmission shaft 10, and the right and left rotations of the left and right rotating screws 9 are rotated forward or reverse by the micro motor 11 to synchronize the two free ends of the diamond telescopic frame 6 Telescopic, unfolding or rolling up the rectangular curtain 2.
- the support bases of the first embodiment, the second embodiment, and the third embodiment are the legs 13 hinged to the lower portion of the fixed support plate 4 or the elongated bottom plate 14 hinged to the lower end of the fixed support plate 4. It is fixed firmly, easy to carry after folding, and it is also convenient to adjust the inclination angle of the rectangular screen 2.
- the leg 13 and the elongated bottom plate 14 are locked and fixed by the locking device when the support is fixed.
- the micromotor 11, the flexible transmission shaft 10, the battery for supplying power to the micromotor 11, and the control device in the third embodiment are all disposed on the long bottom plate 14 or inside the long bottom plate 14, or may be disposed in the fixed support plate 4.
- the above-mentioned micro motor 11 is a stepping motor, which is convenient for precisely controlling the size of the rectangular curtain 2 to be rolled up or stretched by the control device.
- FIG. 3 is a schematic view showing the third embodiment in which the fixed support plate 4 is not mounted;
- FIG. 4 is a schematic view showing the state in which the curtain of the embodiment 3 is extended; and
- FIG. 5 is a schematic view showing the contract of the embodiment 3 after being contracted.
- FIG. 8 is a schematic view showing a state in which the portable telescopic projection screen device screen is unfolded and supported by the long bottom plate 14;
- FIG. 9 is a state in which the portable telescopic projection screen device of the present invention is contracted and supported by the long bottom plate 14;
- FIG. 10 is a schematic view showing a state in which the screen of the portable telescopic projection screen device is contracted and the long bottom plate 14 is folded and merged, so that the structure is compact and convenient to carry.
- the rectangular screen 2 of the integrated portable projection computer of the embodiment 1-3 of the present invention has a diagonal dimension of about 14 inches after being unfolded, which is substantially consistent with the liquid crystal screen of the notebook computer, and can meet the use requirements.
- the present invention is not limited to the present invention, and the present invention is not limited to the above examples. Those skilled in the art can make changes, modifications, additions or substitutions within the scope of the present invention. It also belongs to the protection scope of the utility model.
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- Overhead Projectors And Projection Screens (AREA)
Abstract
一种便携式伸缩投影幕布装置，包括长方形幕布（2）和幕布伸缩支撑架，幕布伸缩支撑架包括固定支撑板（4）和伸缩架，固定支撑板（4）下端设置支撑座，伸缩架设置在固定支撑板（4）上，左右两端均为可水平伸缩的自由端，两个自由端上各竖直设置一根卷轴（12），长方形幕布（2）的两边分别卷绕在对应的卷轴（12）上。伸缩架为菱形伸缩架（6）或X形伸缩架（5）或伸缩杆（3），在两个伸缩自由端上设置卷轴安装外壳（1），卷轴（12）设置在转轴安装外壳（1）内且转动连接，转轴为弹性回转轴。
Description
本实用新型属于投影设备附属装置技术领域，具体说是一种便携式伸缩投影幕布装置。
现有笔记本电脑主要包括显示部分、电脑主机和键盘部分，显示部分通常采用液晶显示屏，为了满足视觉效果，也便于适用各种学习和工作需求，一般液晶屏幕的尺寸都在13英寸左右。为了实现便携，现有笔记本电脑已经向超薄化发展，但受到刚性液晶屏幕对笔记本电脑尺寸的限制，仍然无法摆脱方块状的外形，占用面积仍然很大，需要用电脑包携带，无法做到足够小巧，直接随身携带，仍然满足不了人们便携的要求。尽管已有柔性键盘和折叠键盘出现，若不摆脱刚性液晶屏幕的束缚，仍然无法真正实现笔记本电脑的直接随身携带。
中国专利（申请号201620170742.3）公开了一种便携式投影仪幕布，包括投影幕布和幕布轴，投影幕布一端安装在幕布轴上，所述幕布轴垂直连接主支撑杆，在主支撑杆的侧面上均匀设置多根副支撑杆，在主支撑杆的底部还连接多根弹簧，每根弹簧上均设置与挂扣匹配的挂钩，每根副支撑杆均能够绕与主支撑杆的连接端转动，在每根副支撑杆的外壁上均设置一个槽体，槽体内安装有一个挂扣。该专利的投影仪幕布配合投影仪使用时可以取代液晶屏幕，投影仪幕布自带收纳支撑功能，无需再额外借助支架即可在户外使用，该幕布稳定性好，在不使用时能够将幕布折叠缩小。
但是，以上专利的便携式投影仪幕布采取水平设置的幕布轴卷曲幕布，实现幕布升降,这种方式比较常见。由于幕布为长方形，横向宽度大于高度，因此，刚性幕布轴较长，收起幕布后，携带仍然不便；另外，其结构较为复杂，需要手动操作幕布升降，操作不便，效率较低。
如何设计一种便携式伸缩投影幕布装置，结构简单、紧凑，折叠后易于随身携带；另外，操作方便，幕布升降效率较高。这是目前亟待解决的问题。
本实用新型为解决现有技术存在的上述问题，提供一种便携式伸缩投影幕布装置，结构简单、紧凑，折叠后易于随身携带；另外，操作方便，幕布升降效率较高。
本实用新型的目的是通过以下技术方案实现的：一种便携式伸缩投影幕布装置，包括长方形幕布和幕布伸缩支撑架，其特征在于，所述幕布伸缩支撑架包括固定支撑板和伸缩架，所述固定支撑板下端设置支撑座，所述伸缩架设置在所述固定支撑板上，所述伸缩架的左右两端均为可水平伸缩的自由端，两个所述自由端上各竖直设置一根卷轴，所述长方形幕布的两边分别卷绕在对应的所述卷轴上。
对上述技术方案的改进：所述伸缩架为菱形伸缩架、X形伸缩架或伸缩杆，所述伸缩架的两个所述自由端上设置卷轴安装外壳，所述卷轴设置在所述卷轴安装外壳内且转动连接，所述卷轴为弹性回转轴。
对上述技术方案的进一步改进：在所述固定支撑板或支撑座上设置微型电机及控制装置，所述微型电机通过传动部件驱动所述伸缩架的两个所述自由端进行同步伸缩，展开或卷起所述长方形幕布。
对上述技术方案的一种改进：所述菱形伸缩架对称设置在所述固定支撑板上，所述菱形伸缩架由交叉的连杆和连杆交叉部位的铰接轴铰接构成，所述菱形伸缩架中间有两个上下设置的所述铰接轴，所述固定支撑板内侧面上竖向设置可旋转的左右旋丝杠，所述左右旋丝杠上半部的左旋段套有上丝母，所述左右旋丝杠下半部的右旋段上套有下丝母，所述上丝母和下丝母分别与所述菱形伸缩架中间的两个所述铰接轴连接，有一微型电机通过柔性传动轴与所述左右旋丝杠连接，通过微型电机正转或反转带动所述左右旋丝杠正转或反转从而使所述菱形伸缩架的两个所述自由端同步伸缩，展开或卷起所述长方形幕布。
对上述技术方案的进一步改进：所述支撑座为与所述固定支撑板下部铰接的支腿或与所述固定支撑板下端铰接的长条底板。
对上述技术方案的进一步改进：所述支撑座为与所述固定支撑板下端铰接的长条底板，所述微型电机、柔性传动轴、为所述微型电机供电的电池及控制装置均设置在所述长条底板上。
对上述技术方案的进一步改进：所述的微型电机为步进电机。
本实用新型与现有技术相比的优点和积极效果是：
1、本实用新型的便携式折叠投影幕布装置中的卷轴竖向设置，伸缩架为菱形伸缩架、X形伸缩架或伸缩杆，其结构简单、紧凑，折叠后易于随身携带；
2、本实用新型的伸缩架采用电机驱动，操作方便，幕布升降效率较高；
3、本实用新型支撑座为与固定支撑板下部铰接的支腿或与固定支撑板下端铰接的长条底板，固定牢固，折叠后便于携带，还便于调节屏幕的倾斜角度。
图1是本实用新型一种便携式伸缩投影幕布装置实施例1背面的立体图；
图2是本实用新型一种便携式伸缩投影幕布装置实施例2背面的立体图；
图3是本实用新型一种便携式伸缩投影幕布装置实施例3背面的立体图；
图4是本实用新型一种便携式伸缩投影幕布装置实施例3背面幕布伸开的正视图；
图5是本实用新型一种便携式伸缩投影幕布装置实施例3背面幕布收缩后的正视图；
图6是本实用新型一种便携式伸缩投影幕布装置的局部示意图；
图7是本实用新型一种便携式伸缩投影幕布装置由支腿支撑状态的侧视图；
图8是本实用新型一种便携式伸缩投影幕布装置由长条底板支撑状态的立体图；
图9是本实用新型一种便携式伸缩投影幕布装置幕布收缩后由长条底板支撑状态的立体图；
图10是本实用新型一种便携式伸缩投影幕布装置幕布收缩且长条底板折叠状态的立体图。
以下结合附图对本实用新型作进一步详细描述：
本实用新型一种便携式伸缩投影幕布装置的实施方式，包括长方形幕布2和幕布伸缩支撑架，幕布伸缩支撑架包括固定支撑板4和伸缩架，所述固定支撑板4下端设置支撑座，伸缩架设置在固定支撑板4上，伸缩架的左右两端均为可水平伸缩的自由端，两个自由端上各竖直设置一根卷轴12，长方形幕布2的两边分别卷绕在对应的卷轴12上。
参见图1、图6，本实用新型一种便携式伸缩投影幕布装置的实施例1，包括长方形幕布2、幕布伸缩支撑架，幕布伸缩支撑架包括固定支撑板4和两根伸缩杆3，所述固定支撑板4下端设置支撑座，两根伸缩杆3分别固定在固定支撑板4左右两侧上，两根伸缩杆3外端均为可水平伸缩的自由端，两个自由端上各竖直设置一卷轴安装外壳1，卷轴12设置在卷轴安装外壳1内且转动连接，卷轴12为弹性回转轴，利用弹簧产生卷绕长方形幕布2扭力。
参见图2、图6，本实用新型一种便携式伸缩投影幕布装置的实施例2，包括长方形幕布2、幕布伸缩支撑架，幕布伸缩支撑架包括固定支撑板4和两个X形伸缩架5，在固定支撑板4下端设置支撑座，两个X形伸缩架5一端插入固定支撑板4对应一侧面上的长槽，X形伸缩架5另一端插入转轴安装外壳1上的滑槽内。卷轴12设置在卷轴安装外壳1内且转动连接，卷轴12为弹性回转轴.利用弹簧产生卷绕长方形幕布2扭力。
为了实现自动幕布伸缩，可在固定支撑板4或支撑座上设置微型电机及控制装置，微型电机通过传动部件驱动伸缩架的两个自由端进行同步伸缩，展开或卷起长方形幕布2。
参见图3-图6，本实用新型一种便携式伸缩投影幕布装置的实施例3，包括长方形幕布2、幕布伸缩支撑架，幕布伸缩支撑架包括固定支撑板4和菱形伸缩架6，在固定支撑板4下端设置支撑座，菱形伸缩架6对称设置在所述固定支撑板4上，菱形伸缩架6由交叉的连杆和连杆交叉部位的铰接轴铰接构成。在菱形伸缩架6中间有两个上下设置的铰接轴，在固定支撑板4内侧面上竖向设置可旋转的左右旋丝杠9，在左右旋丝杠9上半部的左旋段套有上丝母7，左右旋丝杠9下半部的右旋段上套有下丝母8，上丝母7和下丝母8分别与菱形伸缩架6中间的两个铰接轴连接。菱形伸缩架6的左右两个外端均为可水平伸缩的自由端，两个自由端上各竖直设置一卷轴安装外壳1，卷轴12设置在卷轴安装外壳1内且转动连接，卷轴12为弹性回转轴.利用弹簧产生卷绕长方形幕布2扭力。有一微型电机11通过柔性传动轴10与左右旋丝杠9下端连接，通过微型电机11正转或反转带动左右旋丝杠9正转或反转从而使菱形伸缩架6的两个自由端同步伸缩，展开或卷起长方形幕布2。
参见图7、图8，实施例1、实施例2和实施例3的支撑座为与固定支撑板4下部铰接的支腿13或与固定支撑板4下端铰接的长条底板14。固定牢固，折叠后便于携带，还便于调节长方形幕布2的倾斜角度。支腿13和长条底板14在支撑固定时，由锁紧装置锁紧固定。
实施例3中的微型电机11、柔性传动轴10、为微型电机11供电的电池及控制装置均设置在长条底板14上或长条底板14内部，也可以设置在固定支撑板4内。优选的，上述微型电机11为步进电机，便于通过控制装置精确控制长方形幕布2卷起或伸展幅度的大小。
图3是实施例3未安装固定支撑板4的示意图；图4是实施例3幕布伸开状态的示意图；图5是实施例3幕布收缩后的示意图。
图8是本实用新型一种便携式伸缩投影幕布装置幕布展开且由长条底板14支撑状态的示意图；图9是本实用新型一种便携式伸缩投影幕布装置幕布收缩后且由长条底板14支撑状态的示意图；图10是本实用新型一种便携式伸缩投影幕布装置幕布收缩后且长条底板14折叠合并状态的示意图，这样结构紧凑，便于携带。
优选的，本实用新型一体式便携投影电脑实施例1-3中的长方形幕布2展开后可投影部分的对角线尺寸为14英寸左右，与笔记本电脑的液晶屏基本一致，可以满足使用需求。
当然，上述说明并非是对本实用新型的限制，本实用新型也并不限于上述举例，本技术领域的普通技术人员，在本实用新型的实质范围内所作出的变化、改型、添加或替换，也属于本实用新型的保护范围。
Claims (8)
- 一种便携式伸缩投影幕布装置，包括长方形幕布和幕布伸缩支撑架，其特征在于，所述幕布伸缩支撑架包括固定支撑板和伸缩架，所述固定支撑板下端设置支撑座，所述伸缩架设置在所述固定支撑板上，所述伸缩架的左右两端均为可水平伸缩的自由端，两个所述自由端上各竖直设置一根卷轴，所述长方形幕布的两边分别卷绕在对应的所述卷轴上。
- 按照权利要求1所述的便携式伸缩投影幕布装置, 其特征在于，所述伸缩架为菱形伸缩架、X形伸缩架或伸缩杆，所述伸缩架的两个所述自由端上设置卷轴安装外壳，所述卷轴设置在所述卷轴安装外壳内且转动连接，所述卷轴为弹性回转轴。
- 按照权利要求1或2所述的便携式伸缩投影幕布装置, 其特征在于，在所述固定支撑板或支撑座上设置微型电机及控制装置，所述微型电机通过传动部件驱动所述伸缩架的两个所述自由端进行同步伸缩，展开或卷起所述长方形幕布。
- 按照权利要求2所述的便携式伸缩投影幕布装置, 其特征在于，所述菱形伸缩架对称设置在所述固定支撑板上，所述菱形伸缩架由交叉的连杆和连杆交叉部位的铰接轴铰接构成，所述菱形伸缩架中间有两个上下设置的所述铰接轴，所述固定支撑板内侧面上竖向设置可旋转的左右旋丝杠，所述左右旋丝杠上半部的左旋段套有上丝母，所述左右旋丝杠下半部的右旋段上套有下丝母，所述上丝母和下丝母分别与所述菱形伸缩架中间的两个所述铰接轴连接，有一微型电机通过柔性传动轴与所述左右旋丝杠连接，通过微型电机正转或反转带动所述左右旋丝杠正转或反转从而使所述菱形伸缩架的两个所述自由端同步伸缩，展开或卷起所述长方形幕布。
- 按照权利要求1或2所述的便携式伸缩投影幕布装置, 其特征在于，所述支撑座为与所述固定支撑板下部铰接的支腿或与所述固定支撑板下端铰接的长条底板。
- 按照权利要求4所述的便携式伸缩投影幕布装置, 其特征在于，所述支撑座为与所述固定支撑板下端铰接的长条底板，所述微型电机、柔性传动轴、为所述微型电机供电的电池及控制装置均设置在所述长条底板上。
- 按照权利要求3所述的便携式伸缩投影幕布装置, 其特征在于，所述的微型电机为步进电机。
- 按照权利要求4或6所述的便携式伸缩投影幕布装置, 其特征在于，所述的微型电机为步进电机。
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