WO2021190061A1 - 一种可升降的屏幕 - Google Patents

一种可升降的屏幕 Download PDF

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Publication number
WO2021190061A1
WO2021190061A1 PCT/CN2020/142146 CN2020142146W WO2021190061A1 WO 2021190061 A1 WO2021190061 A1 WO 2021190061A1 CN 2020142146 W CN2020142146 W CN 2020142146W WO 2021190061 A1 WO2021190061 A1 WO 2021190061A1
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WO
WIPO (PCT)
Prior art keywords
belt
spring
screen
belt spring
screen body
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Application number
PCT/CN2020/142146
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English (en)
French (fr)
Inventor
赵振宇
唐泽达
Original Assignee
深圳光峰科技股份有限公司
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Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2021190061A1 publication Critical patent/WO2021190061A1/zh

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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

  • This application relates to the technical field of electronic equipment, and in particular to a liftable screen.
  • Laser TV is an ultra-short throw projection device that uses a laser light source and projection display technology. It can easily achieve large-scale display effects that are difficult to achieve by traditional LCD TVs, and has a higher cost performance. Laser TV usually needs to be matched with a laser TV screen to achieve the best display effect. On the one hand, because the walls of ordinary households are almost diffusely reflective surfaces, most of the light emitted by laser TVs cannot be viewed by viewers, and the projection effect is greatly reduced. On the other hand, because ambient light will reduce the contrast of the projection screen, laser TV screens need a certain degree of light resistance to ensure a better display contrast. Therefore, the laser TV screen is of great significance to ensure the display effect of the laser TV.
  • the inventor of the present application discovered that most of the laser TV screen frames currently on the market have a fixed structure.
  • the fixed structure of the TV screen occupies a certain amount of space regardless of whether it is watched or not, and the position of the screen has been fixed after installation, and it is difficult to adjust the position again.
  • the main technical problem to be solved by this application is to provide a liftable screen, which can simplify the screen structure and make the overall screen lighter and thinner.
  • a technical solution adopted in this application is to provide a liftable screen, the screen comprising: a casing, the casing is formed with an accommodating space; the screen body; and the lifting part is arranged in the accommodating space ,
  • the lifting part includes a pulley, a spring, and a fixing piece.
  • the spring is used to support the screen body. One end with the spring is connected to the screen body, and the other end with the spring is fixed on the pulley.
  • the pulley is used for rewinding/unwinding the tape.
  • the fixing piece is located on the side of the belt spring, and is used to fix the belt spring to prevent the belt spring from retracting.
  • the lifting part further includes a connecting piece, and one end with a spring is connected with the screen body through the connecting piece.
  • the fixing member includes a friction wheel, the friction wheel is arranged between the belt wheel and the connecting member, and the friction wheel is used to push the belt spring to expand in a predetermined direction.
  • the screen also includes a guide groove, the guide groove is arranged on one side of the pulley, and a part of the belt spring is arranged in the guide groove.
  • the guide groove is arc-shaped, and the curvature of the guide groove gradually decreases along the winding direction of the belt spring.
  • the lifting part further includes a flexible sleeve, one end of the flexible sleeve is fixed on the connecting piece, and the flexible sleeve is used to expand with the belt spring and sleeve the belt spring on the outside.
  • the lifting part further includes a first volute spring, which is connected to the pulley and is used to provide the pulley with a rewinding torque during the rewinding process.
  • the lifting part further includes a second volute spring, which is used to make the belt spring have a retracting force when rewinding.
  • One end of the second volute spring is connected to the belt spring, and the other end of the second volute spring is connected to the pulley.
  • the screen also includes a winding shaft and a third volute spring.
  • the winding shaft is used for winding/unwinding the screen body.
  • the third volute spring is connected to the winding shaft so that the screen body is tightened on the winding shaft during the winding process.
  • the belt wheel includes a first belt wheel and a second belt wheel
  • the belt spring includes a first belt spring and a second belt spring
  • the first belt wheel is used for winding/unwinding the first belt spring
  • the second belt wheel is used for Rewinding/unwinding the second belt spring, after the first belt spring and the second belt spring are unfolded, the concave surface of the first belt spring and the concave surface of the second belt spring are arranged opposite to each other.
  • the fixing member includes an inner pin, the inner pin is arranged between the first pulley and the second pulley, and the adjusting inner pin can fix the belt spring.
  • the lifting part includes a first lifting part and a second lifting part.
  • the first lifting part is arranged along a first direction
  • the second lifting part is arranged along a second direction, wherein the first direction is perpendicular to the second direction.
  • the position where the screen body is in contact with the belt spring is provided with a suction member, and the suction member is used to make the screen body and the belt spring fit together.
  • the liftable screen of the embodiment of the present application includes a housing, a screen body, and a lifting part.
  • the lifting part includes a belt spring, a belt wheel and a fixing part.
  • One end of the belt spring is connected to the screen body. Since the belt spring has an arc-shaped section when unfolded, the belt spring has a large reverse bending moment bearing capacity.
  • the screen body can be supported by using the load-bearing capacity of the belt spring, and the characteristics of the elastic deformation of the belt spring can be used to realize the conversion of the rolling and unfolding state of the screen body.
  • the liftable screen of this embodiment is simple in structure, thin in thickness and light in weight.
  • FIG. 1 is a schematic structural diagram of an embodiment of a liftable screen according to the present application.
  • Figure 2 is a cross-sectional view of the lifting part in Figure 1;
  • Fig. 3 is a structural schematic diagram of the screen that can be raised and lowered when the belt spring is deployed in Fig. 1;
  • Fig. 4 is a schematic structural diagram of an embodiment with a spring in Fig. 2;
  • Fig. 5 is a schematic diagram of the load-bearing capacity of an embodiment with a spring in Fig. 4;
  • FIG. 6 is a schematic structural diagram of a cross section of an embodiment of the lifting part in FIG. 1;
  • Figure 7 is an enlarged view of circle C in Figure 2;
  • FIG. 8 is a top view of an embodiment of the distribution of lifting parts in the lifting screen of the present application.
  • FIG. 9 is a top view of another embodiment of the distribution of lifting parts in the lifting screen of the present application.
  • FIG. 10 is a top view of another embodiment of the distribution of the lifting parts in the lifting screen of the present application.
  • FIG. 11 is a schematic structural diagram of an embodiment of an elastic buckle in the liftable screen of the present application.
  • the liftable screens need to be manually unfolded or rolled, which is not convenient, or requires a thicker supporting structure, which is not beautiful enough to view from the side or back.
  • the present application provides a liftable screen, which has a simple structure, is relatively thin and light, and has a strong bearing capacity.
  • FIG. 1 is a schematic structural diagram of an embodiment of a liftable screen according to the present application.
  • the liftable screen of this embodiment includes a casing 3, a screen body 1 and a lifter 2.
  • the housing 3 is formed with an accommodating space, and the housing 3 is used to support and protect the overall structure of the screen body 1 and the lifting part 2.
  • the screen body 1 is a screen body with a display function.
  • the screen body 1 may be a flexible structure.
  • the screen body 1 can be made of polyethylene terephthalate (PET), polyurethane (PU) and other film materials as a substrate, and the surface of the screen body 1 can be processed with microstructures and paint coatings.
  • the screen further includes a reeling shaft (not shown), which can be fixed in the accommodating space, and the reeling shaft can be rotated around its central axis to rewind or unwind the screen body 1.
  • the screen body 1 After being rolled up, the screen body 1 can be located in the accommodating space formed by the casing 3 to protect the screen body 1 from water and dust.
  • the screen may further include a third volute spring (not shown), and the third volute spring is connected to the winding shaft.
  • the resilience of the third volute spring can be used to further rotate the rewinding shaft in the rewinding direction, so that the screen body 1 is tightened on the rewinding shaft.
  • the lifting part 2 is arranged in the accommodating space and used to expand and rewind the screen body 1. As shown in FIG. 2, FIG. 2 is a cross-sectional view of the lifting part in FIG. 1.
  • the lifting part 2 includes a belt wheel 23, a belt spring 21 and a fixing member.
  • the belt spring 21 is used to support the screen body 1, and one end of the belt spring 21 is connected to the screen body 1.
  • the other end of the belt spring 21 is fixed on a belt wheel 23, and the belt wheel 23 is used for winding/unwinding the belt spring 21.
  • the fixing member is located on one side of the belt spring 21 and is used to fix the belt spring 21 after the belt spring 21 is expanded, so as to prevent the belt spring 21 from retracting and winding on the pulley 23.
  • the lifting part 2 may further include a connecting piece 22, and one end with a spring 21 is connected to the screen body 1 through the connecting piece 22.
  • the beam on one side of the screen body 1 can be connected to the connecting piece 22, wherein the connection method of the screen body 1 and the connecting piece 22 can be threaded connection, riveting or bonding to ensure that the screen body 1 can be lifted and lowered with the lifting part 2.
  • the lifting part 2 may further include a housing 20, and the pulley 21, the belt spring 23 and the fixing member may be arranged in the housing 20 to enhance the protection of the internal components of the lifting part 2.
  • the belt spring 21 is used to support the screen body 1 after being unfolded.
  • the belt spring 21 is an arc-shaped long strip.
  • the basic principle that the belt spring 21 can be used as a structural support is to use the characteristic that the Gaussian curvature of the elastic structure remains unchanged (under the condition of no yielding) within the range where no yielding occurs.
  • Gaussian curvature is the product of the principal curvature of a surface, which is the maximum and minimum value of a point of curvature on the surface, and the two are orthogonal. When the material is processed into a structure with spring 21, the Gaussian curvature is 0.
  • This principle has been applied to some structures in the construction field, such as vaults, corrugated boards, etc.
  • a material with a larger elastic range can be used to make the belt spring 21, preferably high-quality carbon structural steel, which can be made into a desired shape through a heat treatment process.
  • carbon fiber or the like can also be used.
  • the deformation of the belt spring 21 in the unfolded state is mainly divided into bending and torsion.
  • this embodiment mainly utilizes the ability of the belt spring 21 to bear the bending load.
  • its bending direction can be divided into forward and reverse directions.
  • the moment required to make it bend in the forward direction is much smaller than the moment required to make it bend in the reverse direction.
  • the ability is asymmetrical. Take the copper-beryllium alloy with spring 21 as an example.
  • the liftable screen of this embodiment may further include a guide groove 26, which is provided on one side of the pulley 23 and is arranged along the direction in which the belt spring 21 is expanded.
  • the spring 21 is arranged in the guide groove 26, and the cross-sectional shape of the belt spring 21 is changed by the guide groove 26 and matched with the rewinding torque during rewinding, so that the rewinding of the belt spring 21 can be realized. Since the entire deformation process of the belt spring 21 is within the elastic deformation range, it will not affect the mechanical properties of the spring.
  • the guide groove 26 can be designed according to the cross-sectional shape of the belt spring 21 to ensure the consistency of the cross-section of the belt spring 21 in the expanded state.
  • the guide groove 26 is arc-shaped, and the curvature of the guide groove 26 gradually decreases along the winding direction of the belt spring 21. That is, the outermost end of the guide groove 26 is arc-shaped to ensure the spring cross-section after expansion, and the interior gradually transitions to an arc or a straight line with a smaller curvature, so that the belt spring 21 reaches the vicinity of the pulley 23 and has a smaller deformation resistance for convenience Winding.
  • the drive mechanism can drive the pulley 23 to rotate, gradually pushing the belt spring 21 to expand along the guide groove 26, and finally rise in the vertical direction. Fixed to prevent the belt spring 21 from retracting.
  • the fixing member 21 releases the fixing of the belt spring 21, and the driving mechanism rotates in the reverse direction to wind the belt spring 21 on the pulley 23.
  • the lifting part further includes a first volute spring (not shown).
  • the first volute spring is connected to the pulley 23.
  • the pulley 23 can be provided with a winding process.
  • the lifting part 2 further includes a second volute spring (not shown), one end of the second volute spring is connected to the belt spring 21, the other end of the second volute spring is connected to the pulley 23, and the second volute spring is used for The rewinding force of the belt spring 21 can be made more convenient when the belt spring 21 is wound.
  • the structural parameters that have a greater impact on the mechanical properties of the belt spring 21 mainly include thickness, expansion angle, and radius of curvature (or width). Increasing the thickness and expansion angle can improve the load-bearing capacity of the structure, but cannot change the asymmetric characteristic of the load-bearing capacity, that is, the single bearing structure with spring 21 may have instability problems. Therefore, in a preferred embodiment, an axisymmetrically distributed structure with springs 21 can be used, and one side of the belt spring 21 is used as the main bearing structure when bending, so as to solve the problem of the asymmetry of the ability of the belt spring 21 to withstand bending moments. problem. In addition, the symmetrically distributed belt springs 21 also have a certain resistance to torsional deformation.
  • the pulley 23 includes a first pulley 231 and a second pulley 232.
  • the belt spring 21 includes a first belt spring 211 and a second belt spring 212.
  • the first pulley 231 is used for winding/unwinding the first belt.
  • the spring 211 and the second belt wheel 232 are used to rewind/unwind the second belt spring 212. After the first belt spring 211 and the second belt spring 212 are expanded, the concave surface of the first belt spring 211 and the concave surface of the second belt spring 212 Relative settings.
  • first belt spring 211 and the second belt spring 212 are always fixed together and maintained in an expanded state, and the ends can be connected and fixed with the structure that needs to be carried.
  • synchronous gears are fixed on the first pulley 231 and the second pulley 232 to realize the symmetrical rotation of the first pulley 231 and the second pulley 232.
  • the first drive mechanism can drive the first belt wheel 231 and the second belt wheel 232 to rotate symmetrically, and gradually push the first belt spring 211 and the second belt spring 212 to expand or advance along the guide groove 26, and finally Rise in the vertical direction.
  • different driving mechanisms may respectively drive the first pulley 231 and the second pulley 232 to rotate symmetrically, as long as the linear speed of the first pulley 231 and the second pulley 232 are the same.
  • the fixing member may be an inner pin 25, and the inner pin 25 may be provided in the housing 20.
  • the cross-sectional view of the lifting part 2 along the direction perpendicular to the unfolding direction of the belt spring 21 is shown in FIG. 212 between.
  • the belt spring 21 can be fixed by adjusting the inner pin 25 to prevent the belt spring 21 from retracting and winding on the pulley 21.
  • the specific implementation is as shown in FIG. 7, the bottom of the inner pin 25 has a threaded hole, and a screw rod 252 is penetrated inside.
  • the screw rod 252 can be connected to an external driving gear 253, and the driving gear 253 is driven by a power mechanism.
  • the power mechanism drives the screw rod 252 to rotate through the drive gear 253.
  • the screw rod 252 can rotate but does not produce axial displacement.
  • the inner pin 25 can move linearly due to the bottom thread 251, and the inner pin 25 can be in the housing 20 and with a spring. Under the limit of 21, no rotational movement occurs.
  • the inner pin 25 just rises to a position where the belt wheel 23 can be locked by friction after the screen body 1 is fully deployed, and the belt spring 21 is clamped.
  • the screw rod 252 rotates in the reverse direction, thereby releasing the lock on the pulley 23, so that the belt spring 21 can retract and move.
  • the screen further includes a friction wheel 24, and the friction wheel 24 is arranged between the pulley 23 and the connecting member 22.
  • the friction wheel 24 can be used to push the belt spring 21 to expand in a predetermined direction, and the second driving mechanism can drive the friction wheel 24 to push the belt spring 21 forward during the expansion process, so as to realize the expansion at a constant speed.
  • the friction wheel 24 can also play a role of assisting in fixing the belt spring 21.
  • the friction wheel 24 is fixed to one end of the volute spring, and the other end of the volute spring can be fixed to the housing 3 or the outer shell 20.
  • the direction of the volute spring is reasonably set to relax and release the elastic potential energy when the belt spring 21 is unfolded, and gradually tighten when rewinding.
  • the elastic potential energy is stored, so that the volute spring resists the winding of the belt spring 21, which is equivalent to increasing the reverse rotation damping of the friction wheel 24.
  • the lifting part 2 further includes a flexible sleeve (not shown), one end of the flexible sleeve is fixed on the connecting piece 22, and the other end of the flexible sleeve can be fixed on the housing 20.
  • a flexible sleeve (not shown)
  • one end of the flexible sleeve is fixed on the connecting piece 22, and the other end of the flexible sleeve can be fixed on the housing 20.
  • the flexible thin sleeve can be stacked between the connecting piece 22 and the housing 20.
  • the flexible sleeve is expanded with the belt spring 21 and sleeves the belt spring 21 on the outside to avoid the torsion of the belt spring 21.
  • the flexible sleeve can ensure that the symmetrically distributed first belt spring 211 and the second belt spring 212 are attached to each other, avoiding separation, torsion, and the like.
  • the number and arrangement of the lifting parts 2 can be flexibly adjusted.
  • the number of lifting parts 2 can be set to 2, 3, 4, 5, etc. according to actual conditions.
  • the number of lifting parts 2 is two, which are respectively fixed to the two ends of the screen body 1 to realize the lifting and supporting of the screen body 1.
  • the number of lifting parts 2 can be 4. This embodiment is based on the previous embodiment, and further two lifting parts 2 are arranged at equal intervals in the middle, so as to It can carry the weight of the screen body 1 as a whole.
  • the lifting part 2 includes a first lifting part 201 and The second lifting part 202, the first lifting part 201 is arranged along the first direction A, and the second lifting part 202 is arranged along the second direction B, wherein the first direction A and the second direction B are perpendicular.
  • a suction member such as a soft magnetic sticker, Velcro, etc.
  • a suction member is provided at the contact position of the screen body 1 and the belt spring 21 to ensure the adhesion of the screen body 1 and the belt spring 21.
  • a number of elastic buckles 12 are provided where the screen body 1 contacts the belt spring 21.
  • the elastic buckle 12 is fixed on the back of the screen body 1 and has certain elasticity. When the screen body 1 is unfolded, the elastic buckle 12 can just clamp the two sides of the belt spring 21, and the lateral bearing capacity of the belt spring 21 provides the screen body 1 with lateral tension.
  • the liftable screen further includes an adjusting member (not shown), which can be fixed on the housing 3, and the adjusting member is used to enable the belt spring 21 to be clamped to the elastic buckle when the screen body 1 is unfolded In 12, when the screen body 1 is rolled up, the belt spring 21 can be released from the elastic buckle 12.
  • the elastic buckle 12 is rolled up together with the screen body 1.
  • the embodiment of the present application supports the screen body 1 through the load-bearing capacity of the belt spring 21, and utilizes the elastic deformation characteristic of the belt spring 21 to complete the conversion between the unwinding and unwinding states of the screen body 1.
  • the liftable screen of the present application has a simple structure, a thinner thickness and a lighter weight.

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Abstract

一种可升降的屏幕，包括壳体（3），壳体（3）形成有容置空间；屏幕本体（1）；升降部（2），设置于容置空间内，升降部（2）包括带轮（23）、带弹簧（21）、固定件，带弹簧（21）用于支撑屏幕本体（1），带弹簧（21）的一端连接屏幕本体（1）；带弹簧（21）的另一端固定于带轮（23）上，带轮（23）用于收卷/放卷带弹簧（21）；固定件位于带弹簧（21）的一侧，用于固定带弹簧（21），以防止带弹簧（21）回缩。通过这种方式，可使得屏幕整体结构简单、厚度较薄且重量较轻。

Description

一种可升降的屏幕 技术领域
本申请涉及电子设备技术领域，特别是涉及一种可升降的屏幕。
背景技术
激光电视是采用激光光源配合投影显示技术的超短焦投影设备，能够轻松实现传统液晶电视难以实现的大尺寸显示效果，具有较高的性价比。激光电视通常需要搭配激光电视屏幕才能够实现最佳的显示效果。一方面是由于普通家庭的墙面为近似漫反射的表面，使得激光电视发出的光大部分无法被观看者观看，投影效果大打折扣。另一方面，由于环境光会降低投影画面的对比度，激光电视屏幕需要一定的抗光能力才能够保证较好的显示对比度。因此，激光电视屏幕对保证激光电视的显示效果具有重要意义。
本申请的发明人在长期的研发过程中发现，目前市面上常见的激光电视屏幕框架多为固定式的结构。固定式结构的电视屏幕，不论是否观看都占用一定的空间，且安装后屏幕位置已经固定，难以再次调整位置。
发明内容
本申请主要解决的技术问题是提供一种可升降的屏幕，能够简化屏幕结构，使得屏幕整体更加轻薄。
为解决上述技术问题，本申请采用的一个技术方案是:提供一种可升降的屏幕，该屏幕包括：壳体，壳体形成有容置空间；屏幕本体；升降部，设置于容置空间内，升降部包括带轮、带弹簧、固定件，带弹簧用于支撑屏幕本体，带弹簧的一端连接屏幕本体，带弹簧的另一端固定于带轮上，带轮用于收卷/放卷带弹簧；固定件位于所述带弹簧的一侧，用于固定带弹簧，以防止带弹簧回缩。
其中，升降部还包括有连接件，带弹簧的一端通过连接件与屏幕本体连接。
其中，固定件包括摩擦轮，摩擦轮设置于带轮和连接件之间，摩擦轮用于推动带弹簧沿预定的方向展开。
其中，屏幕还包括有导向槽，导向槽设置于带轮的一侧，部分带弹簧设置于导向槽内，导向槽为弧形，导向槽的曲率沿带弹簧收卷的方向逐渐减小。
其中，升降部还包括柔性套筒，柔性套筒的一端固定于连接件上，柔性套筒用于随带弹簧一起展开并在外侧套住带弹簧。
其中，升降部还包括第一涡簧，第一涡簧连接带轮，用于给带轮提供收卷过程中的收卷力矩。
其中，升降部还包括第二涡簧，用于使带弹簧在收卷时具有回缩力，第二涡簧的一端连接带弹簧，第二涡簧的另一端连接带轮。
其中，屏幕还包括收卷轴和第三涡簧，收卷轴用于收卷/放卷屏幕本体，第三涡簧连接收卷轴，使屏幕本体在收卷过程中收紧于收卷轴上。
其中，带轮包括第一带轮和第二带轮，带弹簧包括第一带弹簧和第二带弹簧，第一带轮用于收卷/放卷第一带弹簧，第二带轮用于收卷/放卷第二带弹簧，第一带弹簧和第二带弹簧展开后，第一带弹簧的凹面与第二带弹簧的凹面相对设置。
其中，固定件包括内销，内销设置于第一带轮和第二带轮之间，调节内销能够固定带弹簧。
其中，升降部包括有第一升降部和第二升降部，第一升降部中沿第一方向设置，第二升降部沿第二方向设置，其中第一方向与第二方向垂直。
其中，屏幕本体与带弹簧接触的位置设置有吸附件，吸附件用于使屏幕本体与带弹簧贴合。
本申请实施例的有益效果是：区别于现有技术，本申请实施例的可升降的屏幕包括有壳体、屏幕本体和升降部。升降部包括有带弹簧、带轮和固定件，带弹簧的一端连接屏幕本体，由于带弹簧展开时具有弧形 截面，因此带弹簧具有较大的反向弯矩承载能力，在屏幕本体展开时，可通过利用带弹簧的承载能力支撑屏幕本体，且利用带弹簧具有弹性变形的特点可以实现屏幕本体的收卷和展开状态的转换。本实施例的可升降的屏幕结构简单，厚度较薄且重量较轻。
附图说明
图1是本申请可升降的屏幕一实施例的结构示意图；
图2是图1中升降部的剖面图；
图3是图1中带弹簧展开时可升降的屏幕的结构示意图；
图4是图2中带弹簧的一实施例的结构示意图；
图5是图4中带弹簧一实施例的承载能力示意图；
图6是图1中升降部的一实施例的横截面的结构示意图；
图7是图2中圈C的放大图；
图8是本申请可升降的屏幕中升降部的分布一实施例的俯视图；
图9是本申请可升降的屏幕中升降部的分布另一实施例的俯视图；
图10是本申请可升降的屏幕中升降部的分布又一实施例的俯视图；
图11是本申请可升降的屏幕中弹性卡扣一实施例的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
目前市面上的激光电视产品以固定式的屏幕为主，可升降的屏幕或者需要人工展开或收卷，不够方便，或者需要较厚的支撑结构，从侧面或背面看不够美观。本申请提供了一种可升降的屏幕，不仅结构简单，较为轻薄，且承载能力强。
请参阅图1，图1是本申请可升降的屏幕一实施例的结构示意图。 本实施例的可升降的屏幕包括壳体3、屏幕本体1和升降部2。壳体3形成有容置空间，壳体3用于对屏幕本体1和升降部2的整体结构进行支撑和保护。
具体地，屏幕本体1为具有显示功能的屏幕主体，为实现对屏幕本体1的收卷，屏幕本体1可以为柔性结构。屏幕本体1可选用聚对苯二甲酸乙二醇酯(Polyethylene terephthalate，PET)、聚氨酯(poly urethane，PU)等薄膜材料作为基材，并在其表面制作微结构、覆盖漆膜等处理。
进一步地，屏幕还包括收卷轴(未图示)，收卷轴可固定于容置空间内，且收卷轴可绕其中心轴进行旋转，以对屏幕本体1进行收卷或放卷。屏幕本体1在收卷后可位于壳体3形成的容置空间内，以对屏幕本体1进行防水防尘等保护。
优选地，屏幕还可包括第三涡簧(未图示)，第三涡簧连接收卷轴。收卷轴在收卷屏幕本体1时，能够利用第三涡簧的回弹力，使收卷轴进一步向收卷的方向旋转，进而使屏幕本体1收紧于收卷轴上。
升降部2设置于容置空间内，用于实现对屏幕本体1的展开和收卷。如图2所示，图2是图1中升降部的剖视图，升降部2包括带轮23、带弹簧21和固定件。
带弹簧21用于支撑屏幕本体1，带弹簧21的一端连接屏幕本体1。带弹簧21的另一端固定于带轮23上，带轮23用于收卷/放卷带弹簧21。固定件位于带弹簧21的一侧，用于在带弹簧21展开后固定带弹簧21，以防止带弹簧21回缩而绕于带轮23上。
可选地，升降部2还可包括连接件22，带弹簧21的一端通过连接件22与屏幕本体1连接。屏幕本体1一侧的横梁可与连接件22相连，其中屏幕本体1和连接件22的连接方式可以为螺纹连接、铆接或粘接，以保证屏幕本体1能够随着升降部2进行升降。
可选地，升降部2还可包括外壳20，带轮21、带弹簧23和固定件可设置于外壳20内，以增强对升降部2的内部部件的保护。
如图3所示，带弹簧21展开后用于支撑屏幕本体1。如图4所示，带弹簧21为圆弧形的长条带。本实施例中，带弹簧21能够作为结构支 撑的基本原理是利用了弹性结构在不发生屈服的范围内高斯曲率保持不变(不发生屈服的条件下)的特性。根据高斯绝妙定理，高斯曲率为曲面主曲率的乘积，主曲率为曲面上过一点曲率的极大和极小值，二者正交。当材料加工成带弹簧21结构时高斯曲率为0，产生弯曲后在截面方向上曲率(主曲率之一)不为零，而在长度上为了保持高斯曲率不变(＝0)所以必然曲率为0(即保持直线)，从而在长度方向上保持较高的刚度。这种原理已经应用于建筑领域的一些结构，例如拱顶、瓦楞板等。根据以上原理，可选用弹性范围较大的材料制作带弹簧21，优选优质碳素结构钢，可通过热处理工艺制成所需的形状。在其他实施例中，如能满足要求，也可使用碳纤维等。
展开状态时带弹簧21的变形主要分为弯曲和扭转。其中，本实施例主要利用带弹簧21承载弯曲载荷的能力。根据带弹簧21结构，其弯曲方向可分为正向和反向，通常使其发生正向弯曲所需的力矩远小于使其发生反向弯曲所需的力矩，即带弹簧21在承受弯矩的能力上具有非对称的特点。以带弹簧21的材质为铜铍合金为例，当其长度为200mm，厚度为0.1mm，截面圆半径13.3mm，圆心角为106°时，如图5所示，其承载能力明显具有不对称性，超过临界弯矩后带弹簧21变形所需的弯矩迅速下降到较低的水平。因此为了便于带弹簧21的展开和收卷，本实施例的可升降的屏幕还可包括导向槽26，导向槽26设置于带轮23的一侧且沿带弹簧21展开的方向布置，部分带弹簧21设置于导向槽26内，收卷时通过导向槽26改变带弹簧21横截面形状并配合收卷力矩，便能够实现对带弹簧21的收卷。由于带弹簧21整个变形过程都处于弹性变形范围内，因此不会对弹簧力学性能造成影响。
具体地，导向槽26可根据带弹簧21的截面形状进行设计，保证带弹簧21展开状态的截面一致性。优选地，导向槽26为弧形，导向槽26的曲率沿带弹簧21收卷的方向逐渐减小。即导向槽26最外端为圆弧形，保证展开后的弹簧截面，内部逐渐过渡为曲率较小的弧形或直线，使带弹簧21到达带轮23附近具有较小的变形抗力，以方便收卷。
带弹簧21展开时，可由驱动机构带动带轮23进行旋转，逐渐推动 带弹簧21沿导向槽26展开，并最终沿竖直方向上升，带弹簧21完全展开后，可由固定件对带弹簧21进行固定，以防止带弹簧21回缩。在进行收卷时，固定件21解除对带弹簧21的固定，驱动机构反向旋转可使带弹簧21收卷于带轮23上。
在一个具体的实施例中，升降部还包括第一涡簧(未图示)，第一涡簧连接带轮23，通过利用第一涡簧的回弹力，能够给带轮23提供收卷过程中的收卷力矩。在其他实施例中，升降部2还包括第二涡簧(未图示)，第二涡簧的一端连接带弹簧21，第二涡簧的另一端连接带轮23，第二涡簧用于使带弹簧21在收卷时具有回缩力，可以使得带弹簧21的收卷更为方便。
对带弹簧21力学性能具有较大影响的结构参数主要有厚度、展开角、曲率半径(或宽度)等。增大厚度及展开角可以提高结构的承载能力，但无法改变承载能力非对称的特点，即单一带弹簧21承力结构可能存在失稳的问题。因此，在一个优选的实施例中，可采用轴对称分布的带弹簧21结构，受弯时分别由一侧的带弹簧21作为主要承力结构，从而解决带弹簧21承受弯矩能力不对称的问题。另外，对称分布的带弹簧21对扭转变形也有一定的抵抗能力。
具体地，带轮23包括第一带轮231和第二带轮232，带弹簧21包括第一带弹簧211和第二带弹簧212，第一带轮231用于收卷/放卷第一带弹簧211，第二带轮232用于收卷/放卷第二带弹簧212，第一带弹簧211和第二带弹簧212展开后，第一带弹簧211的凹面与第二带弹簧212的凹面相对设置。
第一带弹簧211和第二带弹簧212的一端始终固定在一起并保持展开状态，且该端可与需要承载的结构连接固定。本实施例中，在第一带轮231和第二带轮232上固定有同步齿轮以实现第一带轮231和第二带轮232的对称旋转。带弹簧21展开时，可由第一驱动机构带动第一带轮231和第二带轮232对称旋转，逐渐推动第一带弹簧211和第二带弹簧212展开或者沿着导向槽26前进，最终沿竖直方向上升。在其他实施例中，也可由不同的驱动机构分别带动第一带轮231和第二带轮232 对称旋转，只要使第一带轮231和第二带轮232旋转线速度一致即可。
带弹簧21完全展开后可由固定件夹紧，避免带弹簧21回缩。在一个具体的实施例中，固定件可以为内销25，内销25可以设置于外壳20内。本实施例中，升降部2沿垂直于带弹簧21展开的方向的截面图如图6所示，内销25部分容置于导向槽26中，且设置于第一带弹簧211和第二带弹簧212之间。可通过调节内销25固定带弹簧21，以防止带弹簧21回缩而绕于带轮21上。具体实现方式为，如图7所示，内销25底部有螺纹孔，内穿有丝杆252，丝杆252可以与外部的驱动齿轮253相连，驱动齿轮253由动力机构带动。展开过程中，动力机构通过驱动齿轮253带动丝杆252旋转，丝杆252可以旋转但不会产生轴向位移，内销25由于底部螺纹251而可直线移动，且内销25可在外壳20和带弹簧21的限位作用下，并不发生旋转运动。通过合理设计传动比使得内销25在屏幕本体1完全展开后刚好上升到能够通过摩擦力抱死带轮23的位置，夹紧带弹簧21。收卷时丝杆252反向旋转，从而解除对带轮23的抱死，使得带弹簧21可以回缩移动。
在其他实施例中，屏幕还包括摩擦轮24，摩擦轮24设置于带轮23和连接件22之间。摩擦轮24可以用于推动带弹簧21沿预定的方向展开，展开过程可由第二驱动机构带动摩擦轮24推动带弹簧21前进，以实现恒定速度的展开。摩擦轮24还可起到辅助固定带弹簧21的作用。例如，将摩擦轮24与涡簧一端固定，涡簧另一端可与壳体3或者外壳20固定，合理设置涡簧方向使其在带弹簧21展开时放松释放弹性势能，收卷时逐渐收紧储存弹性势能，这样，涡簧对带弹簧21收卷存在抵抗力，相当于增加了摩擦轮24的反向旋转阻尼。
可选地，升降部2还包括柔性套筒(未图示)，柔性套筒的一端固定在连接件22上，柔性套筒的另一端可以固定于外壳20上。带弹簧21收卷时柔性薄套筒可以堆叠在连接件22和外壳20之间，在展开后柔性套筒随带弹簧21一起展开并在外侧套住带弹簧21，可避免带弹簧21的扭转。当带弹簧21包括第一带弹簧211和第二带弹簧212时，柔性套筒可保证对称分布的第一带弹簧211和第二带弹簧212贴在一起，避免 产生分离、扭转等。
根据采用的带弹簧21的尺寸和屏幕本体1的尺寸、重量及设计载荷的不同，升降部2的个数和排布可以灵活调整。升降部2的数量可以根据实际情况设置为2个、3个、4个、5个等。在一个具体的实施例中，如图8所示，升降部2的数量为2个，分别固定于屏幕本体1的两端，以实现对屏幕本体1的升降和支撑。在另一个具体的实施例中，图9所示，升降部2的数量可以为4个，该实施例在上一实施例的基础上，在中间等间隔的再设置两个升降部2，以能够整体承载屏幕本体1的重量。
在又一个实施例中，考虑到升降部2的实际载荷可能来自不同方向，而且要保证屏幕本体1侧边的张紧力，如图10所示，升降部2包括有第一升降部201和第二升降部202，第一升降部201沿第一方向A设置，第二升降部202沿第二方向B设置，其中第一方向A与第二方向B垂直。通过将第一升降部201和第二升降部202设置成不同的排布方向，可以提供对侧向载荷的抵抗能力。
为了实现对侧向载荷的抵抗能力，本实施例中需要耦合屏幕本体1与带弹簧21的横向变形。在一个具体的实施例中，屏幕本体1与带弹簧21接触位置设置吸附件，比如软磁贴、魔术贴等，来保证屏幕本体1与带弹簧21的贴合。在其他可替代的实施例中，如图11所示，在屏幕本体1与带弹簧21接触的位置设置有若干弹性卡扣12。弹性卡扣12固定于屏幕本体1的背面，且具有一定的弹性。屏幕本体1在展开时弹性卡扣12能够刚好夹住带弹簧21的两侧，带弹簧21的侧向承载能力为屏幕本体1提供侧向张紧力。进一步地，该可升降的屏幕还包括调节件(未图示)，调节件可固定在壳体3上，调节件用于在屏幕本体1展开时，使带弹簧21能够卡接于弹性卡扣12中，在屏幕本体1收卷时，使带弹簧21能够从弹性卡扣12中脱出。本实施例中弹性卡扣12与屏幕本体1一起收卷。
区别于现有技术，本申请的实施例通过带弹簧21的承载能力支撑屏幕本体1，且利用带弹簧21具有弹性变形的特点完成屏幕本体1的收卷和展开状态的转换。通过此种方式，使得本申请可升降的屏幕结构简 单，厚度较薄且重量较轻。
以上所述仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。

Claims (12)

  1. 一种可升降的屏幕，其特征在于，所述屏幕包括：
    壳体，所述壳体形成有容置空间；
    屏幕本体；
    升降部，设置于所述容置空间内，所述升降部包括带轮、带弹簧和固定件，所述带弹簧用于支撑所述屏幕本体，所述带弹簧的一端连接所述屏幕本体；所述带弹簧的另一端固定于所述带轮上，所述带轮用于收卷/放卷所述带弹簧；所述固定件位于所述带弹簧的一侧，用于固定所述带弹簧，以防止所述带弹簧回缩。
  2. 根据权利要求1所述的屏幕，其特征在于，所述升降部还包括有连接件，所述带弹簧的一端通过所述连接件与所述屏幕本体连接。
  3. 根据权利要求2所述的屏幕，其特征在于，所述屏幕还包括摩擦轮，所述摩擦轮设置于所述带轮和所述连接件之间，所述摩擦轮用于推动所述带弹簧沿预定的方向展开。
  4. 根据权利要求3所述的屏幕，其特征在于，所述屏幕还包括有导向槽，所述导向槽设置于所述带轮的一侧，部分所述带弹簧设置于所述导向槽内，所述导向槽为弧形，所述导向槽的曲率沿所述带弹簧收卷的方向逐渐减小。
  5. 根据权利要求2所述的屏幕，其特征在于，所述升降部还包括柔性套筒，所述柔性套筒的一端固定于所述连接件上，所述柔性套筒用于随所述带弹簧一起展开并在外侧套住所述带弹簧。
  6. 根据权利要求1所述的屏幕，其特征在于，所述升降部还包括第一涡簧，所述第一涡簧连接所述带轮，用于给所述带轮提供收卷过程中的收卷力矩。
  7. 根据权利要求1所述的屏幕，其特征在于，所述升降部还包括第二涡簧，用于使所述带弹簧在收卷时具有回缩力，所述第二涡簧的一端连接所述带弹簧，所述第二涡簧的另一端连接所述带轮。
  8. 根据权利要求1所述的屏幕，其特征在于，所述屏幕还包括收卷 轴和第三涡簧，所述收卷轴用于收卷/放卷所述屏幕本体，所述第三涡簧连接所述收卷轴，使所述屏幕本体在收卷过程中收紧于所述收卷轴上。
  9. 根据权利要求1所述的屏幕，其特征在于，所述带轮包括第一带轮和第二带轮，所述带弹簧包括第一带弹簧和第二带弹簧，所述第一带轮用于收卷/放卷第一带弹簧，所述第二带轮用于收卷/放卷第二带弹簧，所述第一带弹簧和所述第二带弹簧展开后，所述第一带弹簧的凹面与所述第二带弹簧的凹面相对设置。
  10. 根据权利要求9所述的屏幕，其特征在于，所述固定件包括内销，所述内销设置于所述第一带轮和所述第二带轮之间，调节所述内销能够固定所述带弹簧。
  11. 根据权利要求10所述的屏幕，其特征在于，所述升降部包括有第一升降部和第二升降部，所述第一升降部中沿第一方向设置，所述第二升降部沿第二方向设置，其中所述第一方向与所述第二方向垂直。
  12. 根据权利要求11所述的屏幕，其特征在于，所述屏幕本体与所述带弹簧接触的位置设置有吸附件，所述吸附件用于使所述屏幕本体与所述带弹簧贴合。
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