CN219039560U - Projection screen and projection device - Google Patents

Abstract

The application provides a projection screen and projection equipment, projection screen include base, curtain connecting piece, first lift arm, second lift arm, elastic support piece and elasticity tensile piece. The first lifting arm comprises a first end and a second end, the first end is hinged to the base, the second end is movably hinged to the curtain connecting piece, the second lifting arm is hinged to the first lifting arm, the second lifting arm comprises a third end and a fourth end, the third end is hinged to the curtain connecting piece, and the fourth end is movably hinged to the base. The two ends of the elastic supporting piece are respectively hinged to the base and the first lifting arm, the elastic supporting piece is suitable for driving the first lifting arm to rotate around the base and driving the curtain connecting piece to ascend relative to the base, the elastic stretching piece is respectively connected with the fourth end and the base, and the elastic stretching piece is suitable for providing acting force for the fourth end to move towards the first end. The elastic supporting piece and the elastic stretching piece can enable the curtain connecting piece to stably ascend and descend relative to the base.

Description

Projection screen and projection device

Technical Field

The application relates to the technical field of projection equipment, in particular to a projection screen and projection equipment.

Background

The projection screen is a device capable of projecting images or videos onto a curtain, and is widely applied to various places such as home theatres, office conferences, schools, billboards and the like. The projection screen generally comprises a projection imaging system and an optical amplifying system, wherein the projection signal is changed into an image signal through the processing of the imaging technology of the projection screen, and then the image signal can be projected and displayed on the screen through the amplifying of the optical system. The curtain special for projection is called a projection curtain, and is one of the most commonly used products in projection screen peripheral equipment.

Along with the improvement of the technical level and the living standard, the requirements on the projection screen are higher and higher, and the curtain is unfolded and folded.

Disclosure of Invention

The present application is directed to a projection screen and a projection apparatus, so as to improve at least one of the above technical problems. The above object is achieved by the following technical solutions.

In a first aspect, embodiments of the present application provide a projection screen including a base, a curtain connector, a first lift arm, a second lift arm, an elastic support, and an elastic tension member. The first lifting arm comprises a first end and a second end, the first end is hinged to the base, the second end is movably hinged to the curtain connecting piece, the second lifting arm is hinged to the first lifting arm, the second lifting arm comprises a third end and a fourth end, the third end is hinged to the curtain connecting piece, and the fourth end is movably hinged to the base. One end of the elastic supporting piece is hinged to the base, the other end of the elastic supporting piece is hinged to the first lifting arm, the elastic supporting piece is suitable for driving the first lifting arm to rotate around the base and driving the curtain connecting piece to ascend relative to the base, the elastic stretching piece is connected with the fourth end portion and the base respectively, and the elastic stretching piece is suitable for providing acting force for the fourth end portion to move towards the first end portion.

In one embodiment, the resilient support is a gas spring.

In one embodiment, the projection screen further includes a first fixed pulley rotatably connected to the base and near the first end, the rotation axis of the first fixed pulley is the same as the rising direction of the curtain connecting member relative to the base, the elastic stretching member includes a first connecting spring and a first connecting rope connected to the base, and the first connecting rope is wound around the first fixed pulley and connected to the fourth end.

In one embodiment, the projection screen further comprises a hinge shaft and a thrust bearing, wherein the first lifting arm and the second lifting arm are both hinged to the hinge shaft and distributed along the axial direction of the hinge shaft, the thrust bearing is sleeved on the hinge shaft, and two thrust plates of the thrust bearing are respectively propped against between the first lifting arm and the second lifting arm.

In one embodiment, the projection screen further comprises a third lift arm and a fourth lift arm. The third lifting arm comprises a fifth end and a sixth end, wherein the fifth end is hinged to the base, and the sixth end is movably hinged to the curtain connecting piece. The fourth lifting arm is hinged to the third lifting arm, the fourth lifting arm comprises a seventh end and an eighth end, the seventh end is hinged to the curtain connecting piece, the eighth end is movably hinged to the base, and the moving path of the eighth end and the moving path of the fourth end are distributed along the front-back direction of the projection screen.

In one embodiment, the projection screen further comprises an elastic support, a second fixed pulley, a second connecting spring and a second connecting rope connected to each other. One end of the elastic support is hinged to the base, the other end of the elastic support is hinged to the third lifting arm, and the elastic support is suitable for driving the third lifting arm to rotate around the base and driving the curtain connecting piece to ascend relative to the base. The second fixed pulley is rotatably connected to the base and is close to the fifth end part, and the axial direction of the rotating shaft of the second fixed pulley is the same as the rising direction of the curtain connecting piece relative to the base. The second connecting spring is connected to the base, the second connecting rope is wound on the second fixed pulley and connected with the eighth end part, and the second connecting spring is suitable for providing acting force for the eighth end part to move towards the fifth end part through the second connecting rope.

In an embodiment, the projection screen further includes a first sliding rail, a first sliding block, a second sliding rail and a second sliding block, wherein the first sliding rail and the second sliding rail are connected to the base and are distributed along the front-rear direction, the first sliding rail and the second sliding rail are located between the first end portion and the fifth end portion, the first sliding block is slidably connected to the first sliding rail, the second sliding block is slidably connected to the second sliding rail, the fourth end portion is hinged to the first sliding block, and the eighth end portion is hinged to the second sliding block.

In one embodiment, the projection screen further includes a curtain wrap, a drive motor, and a curtain. The curtain rolling piece is rotatably connected to the base. The output end of the driving motor is connected with the curtain winding piece. The curtain has relative first end and second end, and first end is connected in the curtain connecting piece, and the second end is connected in the curtain rolling piece.

In one embodiment, the projection screen further comprises a curtain tensioning device, the curtain tensioning device comprises a first elastic piece, a second elastic piece, a first connecting rod and a second connecting rod, the first connecting rod is connected to the first end, and the second connecting rod is connected to the second end. The first elastic piece is connected with the first connecting rod and the curtain connecting piece respectively, and the second elastic piece is connected with the second connecting rod and the curtain winding piece respectively.

In one embodiment, the curtain tensioning device further comprises a rotating shaft rotatably connected to one side of the curtain connecting piece away from the base, the curtain is wound on the rotating shaft, and the first end, the first elastic piece and the first connecting rod are located on the same side of the curtain connecting piece opposite to the rotating shaft.

In one embodiment, the curtain tensioning device further comprises a first cord and a second cord, the curtain further having opposite third and fourth ends, the first, second, third and fourth ends comprising the entire side of the curtain. The third end is provided with a first channel, and the first rope penetrates through the first channel and is respectively connected with the curtain connecting piece and the curtain winding piece; the fourth end is provided with a second channel, the second rope penetrates through the second channel and is respectively connected with the curtain winding part of the curtain connecting piece, and the first rope and the second rope are both wound on the rotating shaft.

In one embodiment, the curtain winding member is provided with an accommodating space and an opening, the opening is communicated with the accommodating space, and the second elastic member, the second connecting rod and the second end are all located in the accommodating space, and the curtain penetrates through the opening.

In one embodiment, the projection screen further comprises a first limiting piece and a second limiting piece, the first limiting piece is provided with a first limiting groove, the first limiting piece is connected to the curtain connecting piece, and one side, away from the first connecting rod, of the first elastic piece is located in the first limiting groove; the second limiting piece is provided with a second limiting groove, the second limiting piece is connected to the curtain winding piece and located in the accommodating space, and one side, deviating from the second connecting rod, of the second elastic piece is located in the second limiting groove.

In a second aspect, embodiments of the present application provide a projection device including a projector and a projection screen according to any of the above embodiments.

In one embodiment, the projection device further comprises a mounting bracket to which the base is movably connected in a front-to-rear direction of the projection screen, the mounting bracket being located on a side of the base facing away from the projection screen, and the projector being mounted to the mounting bracket.

In one embodiment, the projection device further comprises a plurality of rollers rotatably coupled to a side of the mounting bracket facing away from the base.

In projection screen and projection equipment that this embodiment provided, first lifting arm's first end articulates in the base, and the second tip is movably articulates in the curtain connecting piece, and the second lifting arm articulates in first lifting arm, and the third end of second lifting arm articulates in the curtain connecting piece, and the fourth tip is movably articulates in the base, and elastic support spare's one end articulates in the base, and elastic support spare's the other end articulates in first lifting arm, and elastic support spare is suitable for driving first lifting arm and rotates around the base, and elastic tension spare is suitable for providing the effort that removes towards first end for the fourth end. When the projection screen is required to be used, the elastic supporting piece drives the first end part to rotate around the base to the side far away from the fourth end part, and the first lifting arm can provide an acting force for lifting the curtain connecting piece relative to the base; simultaneously, the elastic stretching piece applies pulling force to the fourth end, the fourth end moves towards one side of the first end relative to the base, the second lifting arm rotates relative to the base and the curtain connecting piece, the curtain connecting piece is provided with lifting acting force relative to the base, and the curtain connecting piece can lift relative to the base under the double acting forces of the elastic supporting piece and the elastic stretching piece. When the projection screen is not needed, the second end part moves towards one side far away from the third end part relative to the curtain connecting piece, the fourth end part moves towards one side far away from the first end part, the first end part applies a stretching force to the elastic stretching piece, and the elastic stretching piece applies a reaction force to the first end part, so that the fourth end part can stably move relative to the base; simultaneously, the elastic support piece receives the pressure that first lifting arm applyed, and the elastic support piece applys for first lifting arm reaction for first lifting arm can be relative base stable rotation, thereby helps the curtain connecting piece to descend relative base stable. In addition, through the mode that adopts elastic support piece and elasticity tensile piece to provide driving force for the rising of curtain connecting piece relative base, compare in the mode that the related art adopted the motor to promote the curtain connecting piece, still help reducing noise, promoted user experience.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural view of a projection apparatus in an unfolded state according to an embodiment of the present application.

Fig. 2 shows a schematic view of the projection device of fig. 1 in a collapsed state.

Fig. 3 shows a schematic view of the projection device of fig. 1 in partial cutaway.

Fig. 4 shows an enlarged schematic view of the structure at vi of fig. 1.

Fig. 5 shows another schematic cross-sectional structure of the projection device of fig. 1.

Fig. 6 shows an enlarged schematic view of the structure at iv of fig. 1.

Fig. 7 shows another schematic structural diagram of the projection device provided in the embodiment of the present application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without undue effort.

Referring to fig. 1 to 3, in the embodiment of the present application, a projection screen 100 is provided, the projection screen 100 may be used for projecting video and pictures, for example, the projection screen 100 may include a curtain 280 and a driving motor 270, the curtain 280 is connected between the curtain connector 120 and an output end of the driving motor 270, and the driving motor 270 may control the curtain 280 to wind up.

The projection screen 100 includes a base 110, a curtain connector 120, a first lift arm 130, a second lift arm 140, a resilient support 150, and a resilient tension member 160. The driving motor 270 may be mounted to the base 110.

The first lifting arm 130 includes a first end 131 and a second end 133, and a direction of the first end 131 toward the second end 133 is substantially a length direction of the first lifting arm 130.

The first end 131 is hinged to the base 110, so that the first lifting arm 130 can rotate around the base 110, and the first end 131 and the base 110 can be hinged in a shaft hole connection or a bearing connection.

The second end 133 is movably hinged to the curtain connector 120 such that the first lift arm 130 can move and rotate relative to the curtain connector 120. For example, the projection screen 100 may further include a first roller, a first rolling groove is disposed on a side of the curtain connecting piece 120 opposite to the base 110, the first roller is connected in the first rolling groove in a rolling manner, the second end 133 is hinged to the first roller, and the second end 133 and the first roller may be connected in a shaft hole or a bearing manner.

The second lifting arm 140 includes a third end 141 and a fourth end 143, and the direction of the third end 141 toward the fourth end 143 is substantially the length direction of the second lifting arm 140.

The third end 141 is hinged to the curtain connecting piece 120, so that the second lifting arm 140 can rotate around the curtain connecting piece 120, and the hinge manner of the third end 141 and the curtain connecting piece 120 can be hole shaft connection or bearing connection.

The fourth end 143 is movably hinged to the base 110 such that the fourth end 143 can move and rotate relative to the base 110. For example, the projection screen 100 further includes a first sliding rail 220 and a first sliding block 230, the first sliding rail 220 is connected to a side of the base 110 facing the curtain connecting piece 120, the first sliding block 230 is slidably connected to the first sliding rail 220, the fourth end 143 is hinged to the first sliding block 230, and the fourth end 143 and the first sliding block 230 may be hinged by a hole axis connection or a bearing connection.

The second lift arm 140 is hinged to the first lift arm 130, for example, the second lift and the first lift arm 130 are disposed to cross each other and are hinged to each other at the crossing. The second lifting arm 140 and the first lifting arm 130 may be connected by a shaft hole or a bearing, and the hinge position is approximately at the center of the second lifting arm 140 in the longitudinal direction and the center of the first lifting arm 130 in the longitudinal direction.

One end of the elastic support member 150 is hinged to the base 110, the other end of the elastic support member 150 is hinged to the first lifting arm 130, and the elastic support member 150 is adapted to drive the first lifting arm 130 to rotate around the base 110 and drive the curtain connecting member 120 to lift up relative to the base 110. The elastic tension member 160 is connected to the fourth end 143 and the base 110, respectively, and the elastic tension member 160 is adapted to provide a force to the fourth end 143 to move towards the first end 131.

Thus, when the projection screen 100 is required to be used, the driving motor 270 releases the self-locking force, the elastic supporting member 150 drives the first end 131 to rotate around the base 110 to a side far from the fourth end 143, the second end 133 moves relative to the curtain connecting member 120 to a side far from the third end 141, and the first lifting arm 130 can provide a lifting force to the curtain connecting member 120 relative to the base 110 while the first lifting arm 130 moves relative to the base 110 and the curtain connecting member 120. Meanwhile, the elastic stretching member 160 applies a tensile force to the fourth end 143, and the fourth end 143 moves toward the first end 131 side with respect to the base 110, so that the second lifting arm 140 rotates with respect to the base 110 and the curtain connecting member 120, and it can be understood that the rotation directions of the second lifting arm 140 and the first lifting arm 130 are opposite, and the second lifting arm 140 moves with respect to the base 110 and the curtain connecting member 120 and provides a lifting force to the curtain connecting member 120 with respect to the base 110. The curtain link 120 can be raised relative to the base 110 under the dual forces of the elastic support 150 and the elastic tension member 160. When the curtain connecting piece 120 rises relative to the base 110 and drives the curtain 280 to rise to a fully-unfolded state, the double acting forces of the elastic supporting piece 150 and the elastic stretching piece 160 are greater than the tensioning force of the curtain 280 and the weights of the curtain connecting piece 120, the curtain 280, the first lifting arm 130 and the second lifting arm 140 are equal, so that the curtain 280 can be stably kept in the unfolded state, and video and pictures and the like can be conveniently projected.

When the projection screen 100 is not required to be used, the driving motor 270 winds the curtain 280, the winding force of the driving motor 270 is greater than the dual forces of the elastic supporting member 150 and the elastic stretching member 160, so that the curtain connecting member 120 can be lowered relative to the base 110, when the curtain connecting member 120 is lowered, the second end 133 moves towards a side far away from the third end 141 relative to the curtain connecting member 120, the fourth end 143 moves towards a side far away from the first end 131, the first end 131 applies a stretching force to the elastic stretching member 160, and the elastic stretching member 160 applies a reaction force to the first end 131, so that the fourth end 143 can stably move relative to the base 110, thereby helping the curtain connecting member 120 to stably descend relative to the base 110. Meanwhile, when the curtain connector 120 descends, the elastic support member 150 receives the pressure applied by the first lifting arm 130, and the elastic support member 150 applies a reaction force to the first lifting arm 130, so that the first lifting arm 130 can stably rotate relative to the base 110, and the curtain connector 120 is further facilitated to stably descend relative to the base 110.

In addition, by adopting the elastic supporting member 150 and the elastic stretching member 160 to provide the driving force for the lifting of the curtain connecting member 120 relative to the base 110, noise is reduced and user experience is improved as compared with the related art in which the curtain connecting member 120 is lifted by a motor.

Wherein, the stretching amount of the elastic stretching member 160 is larger when the projection screen 100 is in the folded state than when the projection screen 100 is in the unfolded state. That is, when the projection screen 100 is in the folded state, the tensile force applied to the fourth end portion 143 is large, and when the projection screen 100 is in the unfolded state, the tensile force applied to the fourth end portion 143 is small.

In some embodiments, the elastic support 150 may be a gas spring that may provide a more stable force to the first lift arm 130 such that the curtain connector 120 may stably rise and fall relative to the base 110. The elastic support 150 may be a free-form gas spring or other type of gas spring.

In some embodiments, the elastic tension member 160 may include a first connection spring 161 and a first connection rope 163 connected to each other, the first connection spring 161 being connected to the base 110, the first connection rope 163 may change a direction of force, which helps to reduce an occupied area of the elastic tension member 160 on the base 110, and to improve compactness of the projection screen 100. For example, the projection screen 100 may further include a first fixed pulley 170, the first fixed pulley 170 is rotatably connected to the base 110 and is close to the first end 131, the rotation axis of the first fixed pulley 170 is the same as the rising direction of the curtain connecting member 120 relative to the base 110, and the first connecting rope 163 is wound around the first fixed pulley 170 and is connected to the fourth end 143, so that the first fixed pulley 170 may function as a lever, change the direction of the force of the first connecting spring 161, and help to increase the pulling force applied by the elastic tension member 160 to the fourth end 143, thereby improving the efficiency of the first connecting spring 161. In addition, the rotatable design of the first fixed pulley 170 also helps to reduce the friction between the first connecting rope 163 and the first fixed pulley 170, improving the service life of the first connecting rope 163.

In some embodiments, the projection screen 100 may further include a hinge shaft 180 and a thrust bearing 190, where the first lifting arm 130 and the second lifting arm 140 are both hinged to the hinge shaft 180 and distributed along an axial direction of the hinge shaft 180, the thrust bearing 190 is sleeved on the hinge shaft 180, and two thrust pieces of the thrust bearing 190 respectively prop against between the first lifting arm 130 and the second lifting arm 140. In this manner, the thrust bearing 190 facilitates easy rotation between the first and second lift arms 130, 140, and also facilitates reducing the distance between the first and second lift arms 130, 140 that is offset axially along the hinge shaft 180, and facilitates avoiding rattling of the first and second lift arms 130, 140 during relative rotation.

In some embodiments, the projection screen 100 may further include a first bearing and a second bearing, wherein an inner ring of the first bearing is sleeved on the hinge shaft 180, and an outer ring of the first bearing is connected to the first lifting arm 130. The inner ring of the second bearing is sleeved on the hinge shaft 180, and the outer ring of the second bearing is connected to the second lifting arm 140. In this manner, the rotation between the first lift arm 130 and the second lift arm 140 is facilitated to be more stable.

In some embodiments, the projection screen 100 may further include a third lifting arm 200 and a fourth lifting arm 210, where the third lifting arm 200 and the fourth lifting arm 210 cooperate with each other to make the lifting and lowering of the curtain connector 120 relative to the base 110 more stable, and at the same time, help to avoid the projection screen 100 from tilting.

The third lifting arm 200 may include a fifth end 201 and a sixth end 203, where the fifth end 201 is hinged to the base 110, so that the fifth end 201 may rotate relative to the base 110, and the fifth end 201 may be hinged to the base 110 by a hole shaft connection or a bearing connection.

The sixth end 203 is movably hinged to the curtain connector 120 such that the sixth end 203 can move and rotate relative to the curtain connector 120. For example, the projection screen 100 may further include a second roller, a second rolling groove is disposed on a side of the curtain connecting piece 120 opposite to the base 110, the second roller is connected in the second rolling groove in a rolling manner, the sixth end 203 is hinged to the second roller, and the sixth end 203 and the second roller may be connected in a shaft hole or a bearing manner. Wherein, the first rolling groove and the second rolling groove are distributed along the front-back direction of the projection screen 100, which helps to avoid the interference of the first roller and the second roller. When the projection screen 100 is in the unfolded state, the directions of the opposite sides of the curtain 280 are approximately the front-back direction of the projection screen 100.

The fourth lifting arm 210 may include a seventh end 211 and an eighth end 213, where the seventh end 211 is hinged to the curtain connector 120, so that the seventh end 211 may rotate relative to the curtain connector 120, and the hinge manner of the seventh end 211 and the curtain connector 120 may be hole shaft connection or bearing connection.

The eighth end 213 is movably hinged to the base 110 such that the eighth end 213 can move and rotate relative to the base 110. For example, the projection screen 100 may further include a second slide rail 240 and a second slider 250, where the first slide rail 220 and the second slide rail 240 are both connected to the base 110 and distributed along the front-rear direction, the first slide rail 220 and the second slide rail 240 are both located between the first end 131 and the fifth end 201, the second slider 250 is slidably connected to the second slide rail 240, the eighth end 213 is hinged to the second slider 250, and the eighth end 213 and the second slider 250 may be hinged by a hole axis connection or a bearing connection.

In some embodiments, projection screen 100 may also include a resilient support 215. One end of the elastic support 215 is hinged to the base 110, the other end of the elastic support 215 is hinged to the third lifting arm 200, and the elastic support 215 is suitable for driving the third lifting arm 200 to rotate around the base 110 and driving the curtain connecting piece 120 to ascend relative to the base 110. Thus, when the projection screen 100 is required to be used, the elastic support 215 can drive the third lifting arm 200 to rotate around the base 110, so that the third lifting arm 200 moves relative to the base 110 and the curtain connecting piece 120, and simultaneously provides a lifting force for the curtain connecting piece 120 relative to the base 110. When the projection screen 100 is not required to be used, the elastic support 215 is subjected to the pressure applied by the third lifting arm 200, and the elastic support 215 applies a reaction force to the third lifting arm 200, so that the third lifting arm 200 can stably rotate relative to the base 110, and the curtain connector 120 can stably descend relative to the base 110.

The elastic support 215 may be a gas spring. The gas spring may provide a more stable force to the fourth elevating arm 210 so that the curtain link 120 may stably ascend and descend with respect to the base 110. The elastic support 215 may be a free-form gas spring or other type of gas spring.

In some embodiments, projection screen 100 may further include a second fixed pulley 216, a second connecting spring 217, and a second connecting cord 219, second connecting spring 217 and second connecting cord 219 being connected, second connecting spring 217 being adapted to provide eighth end 213 with a force moving toward fifth end 201 via second connecting cord 219. For example, the second fixed pulley 216 is rotatably connected to the base 110 and is close to the fifth end 201, and the axial direction of the rotation axis of the second fixed pulley 216 is the same as the rising direction of the curtain connecting member 120 relative to the base 110. The second connecting spring 217 is connected to the base 110, and the second connecting rope 219 is wound around the second fixed pulley 216 and connected to the eighth end 213.

Thus, when the projection screen 100 is required to be used, the second connecting spring 217 may apply a pulling force to the eighth end 213 through the second connecting cord 219 and change the direction of the force through the second fixed pulley 216, so that the eighth end 213 may move toward the fifth end 201, so that the fourth elevating arm 210 moves relative to the base 110 and the curtain link 120 while providing an elevating force to the curtain link 120 relative to the base 110. When the projection screen 100 is not required to be used, the fourth lifting arm 210 applies the force to the second connecting cord 219 and the second connecting spring 217, and the second connecting cord 219 and the second connecting spring 217 apply the reaction force to the fourth lifting arm 210, so that the fourth lifting arm 210 can stably rotate relative to the base 110, and the curtain connection 120 can stably descend relative to the base 110. In addition, the rotatable design of the second fixed pulley 216 also helps to reduce friction between the second connecting cord 219 and the second fixed pulley 216, improving the service life of the second connecting cord 219.

In some embodiments, the projection screen 1000 may further include a limiting device to limit a sliding travel of the first slider and the second slider relative to the first sliding rail and the second sliding rail, respectively. For example, the projection screen 1000 further includes a travel switch electrically connected to the drive motor 270, the first slide rail is connected to the two travel switches, and the first slider is located between the two travel switches. For ease of understanding, the following description will be made with a first travel switch and a second travel switch, the first travel switch being located between the first end 131 and the fourth end 143, the second travel switch being located on a side of the fourth end 143 remote from the first end 131. When the curtain connecting piece 120 rises relative to the base 110, the first slider slides to a side close to the first end 131 and touches and presses the first travel switch, the first travel switch sends a touch signal, and the driving motor 270 stops rotating and self-locks after receiving the touch signal, so that the sliding of the first slider is limited, and the limiting effect is achieved. When the curtain connecting piece 120 descends relative to the base 110, the first sliding block slides to one side far away from the first end 131 and touches and presses the second travel switch, the second travel switch sends out a touch signal, the driving motor 270 stops rotating and is self-locking after receiving the touch signal, and therefore sliding of the first sliding block is limited, and therefore limiting effect is achieved.

Two travel switches can be connected to the second slide rail, and the two travel switches can be used for limiting the sliding travel of the second slide block, and are not repeated.

The movement paths of the eighth end 213 and the fourth end 143 are distributed along the front-rear direction of the projection screen 100, which helps to avoid interference when the first lifting arm 130 and the fourth lifting arm 210 move relative to the base 110, and also helps to improve the compactness of the projection screen 100.

The fourth lifting arm 210 is hinged to the third lifting arm 200, so that the fourth lifting arm 210 and the third lifting arm 200 can rotate relatively, and the hinge manner of the fourth lifting arm 210 and the third lifting arm 200 is substantially the same as the hinge manner of the first lifting arm 130 and the second lifting arm 140, and will not be described in detail.

Wherein, the rotation direction of the third lifting arm 200 is approximately opposite to the rotation direction of the first lifting arm 130, and the rotation direction of the fourth lifting arm 210 is approximately opposite to the rotation direction of the second lifting arm 140. For example, the elastic support 150 may be connected to the third lifting arm 200 in a specific connection manner substantially the same as that of the first lifting arm 130 and the elastic support 150, which is not described in detail. The elastic stretching member 160 may be connected to the fourth lifting arm 210 in the same manner as the second lifting arm 140 and the elastic stretching member 160, and will not be described in detail.

In some embodiments, the projection screen 100 may further include a curtain winding member 260, where the curtain winding member 260 is rotatably connected to the base 110, for example, a first support and a second support are opposite to each other on a side of the base 110 facing the curtain connecting member 120, two ends of the curtain connecting member 120 are respectively connected between the first support and the second support, and a connection manner between the curtain connecting member 120 and the first support and the second support may be shaft hole connection or bearing connection. The output end of the driving motor 270 is connected with the curtain winding member 260, the curtain 280 has a first end 281 and a second end 283 which are opposite, the first end 281 is connected with the curtain connecting member 120, and the second end 283 is connected with the curtain winding member 260, so that the driving motor 270 can drive the curtain winding member 260 to rotate when rotating forward and backward, thereby winding or paying out the curtain 280. The driving motor 270 has a self-locking force, so, when the projection screen 1000 is in a folded state, the driving motor 270 can pull the curtain connecting piece 120 through the curtain 280, which helps to avoid the situation that the curtain connecting piece 120 rises relative to the base 110 under the action of the elastic supporting piece 150 and the elastic stretching piece 160.

In addition, the curtain winding member 260 is controlled to wind or release the curtain 280 by the driving motor 270, so that the curtain connecting member 120 is controlled to lift relative to the base 110, and driving force is provided for the lifting of the curtain connecting member 120 relative to the base 110 by the elastic supporting member 150 and the elastic stretching member 160, so that noise is reduced, and user experience is improved.

Referring to fig. 1, 4 and 5, in some embodiments, the projection screen 100 may further include a curtain tensioning device 290, where the curtain tensioning device 290 includes a first elastic member 291, a second elastic member 293, a first connecting rod and a second connecting rod, the first connecting rod is connected to the first end 281, the second connecting rod is connected to the second end 283, for example, the first end 281 and the second end 283 are respectively sewn with an annular sleeve along a length direction, and two channels are formed, and the first connecting rod and the second connecting rod are respectively disposed in the two channels in a penetrating manner.

The first elastic member 291 is connected to the first link and the curtain connector 120, and the second elastic member 293 is connected to the second link and the curtain winder 260. Thus, the first elastic member 291 applies a force to the first link, and the force can be dispersed by the first link and then transferred to the curtain 280, so that the first end 281 of the curtain 280 has a relatively uniform and upward pulling force. The second elastic member 293 applies force to the second connecting rod, and the second connecting rod can disperse the force and then transmit the force to the curtain 280, so that the second end 283 of the curtain 280 has relatively uniform and downward pulling force, and thus, the two ends of the curtain 280 receive pulling force in two directions respectively, and the curtain 280 can be tensioned. In addition, the first elastic member 291 and the second elastic member 293 can also play a role in compensating displacement, for example, the curtain 280 is uneven due to installation errors or manufacturing errors of parts, and at this time, the first elastic member 291 and the second elastic member 293 can compensate for the errors through elasticity of themselves, so that the surface of the curtain 280 is smoother, and user experience is improved.

The first elastic member 291 may hook the first link through a hooking portion at one end and pierce the curtain 280, so that displacement of the first elastic member 291 is avoided. The second elastic member 293 may also hook the first link by a hooking portion at one end and pierce the curtain 280, so as to help avoid displacement of the first elastic member 291.

The number of the first elastic members 291 and the second elastic members 293 may be plural, which helps to further enhance the tensioning effect of the curtain 280. For example, the number of the first elastic members 291 and the second elastic members 293 may be 1, 2, 10, 11, 20, 21, etc., or the specific number of the first elastic members 291 and the second elastic members 293 may be adjusted according to actual needs. The first elastic member 291 and the second elastic member 293 may be springs, and hooks may be disposed at both ends of the springs to facilitate hooking. Alternatively, the first elastic member 291 and the second elastic member 293 may be other elastic members.

In some embodiments, the projection screen 100 may further include a first limiting member 310, where the first limiting member 310 is provided with a first limiting groove, and the number of the first limiting grooves may be plural to correspond to the number of the first elastic members 291. The first limiting piece 310 is connected to the curtain connecting piece 120, and one side, deviating from the first connecting rod, of the first elastic piece 291 is located in the first limiting groove, so that displacement of the first elastic piece 291 is avoided, and the tensioning effect of the curtain 280 is affected. The first limiting member 310 may be connected to the curtain connecting member 120 through a fixing member, and the fixing member may be a bolt, a screw, a rivet, or the like.

Referring to fig. 1 and 6, in some embodiments, the curtain tensioning device 290 may further include a rotating shaft 299, where the rotating shaft 299 is rotatably connected to a side of the curtain connecting piece 120 away from the base 110, for example, the curtain connecting piece 120 may be provided with a third bracket and a fourth bracket along a length direction, two ends of the rotating shaft 299 are respectively connected to the third bracket and the fourth bracket, and the connection manners may be hole-axle connection or bearing connection.

The curtain 280 is disposed around the rotation shaft 299, and the first end 281, the first elastic member 291, and the first connecting rod are disposed on the same side of the curtain connecting member 120 opposite to the rotation shaft 299. Thus, the rotating shaft 299 can play a role of lever, which is helpful to increase the acting force applied to the curtain 280 by the first elastic piece 291 through the first connecting rod, and improve the efficiency of the first elastic piece 291. In addition, the rotatable design of the rotating shaft 299 is also helpful to reduce the friction between the curtain 280 and the rotating shaft 299 and prolong the service life of the curtain 280.

In some embodiments, the first end 281 may further sew a fabric, and sew an annular sleeve on the fabric, where a channel is provided in the annular sleeve, and the first link is penetrated in the channel, and because the annular sleeve is directly connected with the first link, the stress at the annular sleeve is larger, so that the curtain 280 is easily deformed, the optical effect of the curtain 280 is affected, and the fabric may play a role in indirectly tensioning the curtain 280, and meanwhile, the deformation of the fabric does not affect the optical effect of the curtain 280. The color of the face fabric may be black, so as to reduce the influence of the light refracted by the face fabric on the optical effect of the curtain 280.

The face cloth can be wound on the rotating shaft 299, so that the curtain 280 is prevented from being directly connected with the rotating shaft 299, and the service life of the curtain 280 is prolonged. In addition, the smaller diameter of the rotating shaft 299 is also helpful to avoid bending the curtain 280, which affects the optical effect of the curtain 280.

In some embodiments, the second end 283 may also be sewn with a fabric and an annular sleeve, and the specific connection manner and the beneficial effects are substantially the same as those of the fabric and the annular sleeve sewn with the first end 281, which will not be described in detail.

In addition, the first elastic member 291 can hook the first connecting rod through the hooking portion at one end and pierce the cloth on one side of the first end 281, so as to avoid damaging the curtain 280. The second elastic member 293 may also hook the first link by a hooking portion at one end and pierce the cloth on one side of the second end 283, so as to avoid damaging the curtain 280.

In some embodiments, the curtain tensioning device 290 may further include a first cord and a second cord, the curtain 280 further having opposite third and fourth ends 285, 287, the first, second, third and fourth ends 281, 283, 285, 287 comprising the entire side of the curtain 280, e.g., the curtain 280 may be rectangular in configuration for ease of winding and unwinding. The third end 285 is provided with a first channel through which the first rope passes, the first rope is connected with the curtain connecting piece 120 and the curtain winding piece 260 respectively, the fourth end 287 is provided with a second channel through which the second rope passes, the second rope is connected with the curtain connecting piece 120 and the curtain winding piece 260 respectively, and the first rope and the second rope are both wound around the rotating shaft 299. In this way, the first cord and the second cord may help to avoid curling of the third end 285 and the fourth end 287, so that the third end 285 and the fourth end 287 remain straight, improving user experience. For example, the third end 285 and the fourth end 287 may each be sewn into annular sleeves, with first and second channels provided in each of the two annular sleeves.

In some embodiments, the first rope may be connected to the curtain connection member 120 through the first elastic member 291, and the second rope may be connected to the curtain connection member 120 through the second elastic member 293, so that the elastic forces of the first elastic member 291 and the second elastic member 293 may compensate for errors in the length directions of the first rope and the second rope.

In some embodiments, the outer peripheral surface of the curtain winding member 260 may be provided with a first annular avoidance groove and a second annular avoidance groove along two ends of the length direction, where the first annular avoidance groove may be used to receive an annular sleeve and a first rope sewn at the third end 285, and the second annular avoidance groove may be used to receive an annular sleeve and a second rope sewn at the fourth end 287, so as to help avoid the swelling of the curtain 280 after winding, and also help to avoid the damage of the curtain 280 caused by the extrusion of the first rope and the second rope.

Referring to fig. 1 and 5, in some embodiments, the curtain winding member 260 is provided with an accommodating space 261 and an opening 263, the opening 263 is communicated with the accommodating space 261, the second elastic member 293, the second connecting rod and the second end 283 are all located in the accommodating space 261, and the curtain 280 is disposed through the opening 263. Thus, the space in the curtain winding member 260 can be fully utilized, the compactness of the projection screen 100 is improved, and the curtain 280 is easy to wind. In addition, the sewn face cloth of the second end 283 also helps to avoid direct rubbing of the curtain 280 against the curtain wrap 260 at the opening 263.

In some embodiments, the projection screen 100 may further include a second stopper 320, and the second stopper 320 may be provided with second stopper grooves, and the number of the second stopper grooves may be plural to correspond to the number of the second elastic members 293. The second limiting member 320 is connected to the curtain winding member 260 and located in the accommodating space 261, and a side of the second elastic member 293 facing away from the second connecting rod is located in the second limiting groove. In this way, the second elastic member 293 is prevented from being displaced, which affects the tensioning effect of the curtain 280. The second limiting member 320 may be connected to the curtain winding member 260 through a fixing member, which may be a bolt, a screw, a rivet, or the like.

Referring to fig. 6, the embodiment of the present application further provides a projection device 1000, where the projection device 1000 includes a projector 400 and the projection screen 100 in the above embodiment, and the projector 400 may be used to project video and images onto the curtain 280. Since the projection apparatus 1000 includes the projection screen 100, the projection apparatus 1000 has all the advantages of the projection screen 100, which will not be described in detail herein.

In some embodiments, the projection apparatus 1000 may further include a mounting bracket 500 to which the base 110 is movably coupled in the front-rear direction of the projection screen 100, the mounting bracket 500 being located on a side of the base 110 facing away from the projection screen 100, and the projector 400 being mounted to the mounting bracket 500. In this manner, the distance of projector 400 from projection screen 100 may be adjusted.

For example, the mounting bracket 500 is provided with a sliding rail along the front-rear direction of the projection screen 100, and correspondingly, the base 110 is provided with a slider slidably connected to the sliding rail, so that the base 110 can slide with respect to the mounting bracket 500.

In some embodiments, the projection device 1000 may further include a plurality of rollers 600, the plurality of rollers 600 rotatably coupled to a side of the mounting bracket 500 facing away from the base 110. In this manner, the user may be facilitated to move the projection device 1000. The roller 600 may be a universal wheel, which further provides convenience for a user to move the projection device 1000. The number of rollers 600 may be 3, 4, 5, etc.

In the projection screen 100 and the projection device 1000 provided in the present application, the first end 131 of the first lifting arm 130 is hinged to the base 110, the second end 133 is movably hinged to the curtain connecting member 120, the second lifting arm 140 is hinged to the first lifting arm 130, the third end 141 of the second lifting arm 140 is hinged to the curtain connecting member 120, the fourth end 143 is movably hinged to the base 110, the elastic supporting member 150 is adapted to drive the first lifting arm 130 to rotate around the base 110, and the elastic stretching member 160 is adapted to provide a force to the fourth end 143 to move toward the first end 131. When the projection screen 100 is required to be used, the elastic support 150 drives the first end 131 to rotate around the base 110, and the first lifting arm 130 can provide a lifting force for the curtain connecting piece 120 relative to the base 110; meanwhile, the elastic stretching member 160 applies a tensile force to the fourth end 143, and the fourth end 143 moves relative to the base 110, so that the second lifting arm 140 rotates relative to the base 110 and the curtain connecting member 120, the second lifting arm 140 provides a force for lifting the curtain connecting member 120 relative to the base 110, and the curtain connecting member 120 can lift relative to the base 110 under the double acting forces of the elastic supporting member 150 and the elastic stretching member 160.

When the projection screen 100 is not required to be used, the second end 133 moves toward a side away from the third end 141 with respect to the curtain link 120, the fourth end 143 moves toward a side away from the first end 131, the first end 131 applies a tensile force to the elastic tensile member 160, and the elastic tensile member 160 applies a reaction force to the first end 131, so that the fourth end 143 can stably move with respect to the base 110; meanwhile, the elastic support member 150 is subjected to the pressure applied by the first lifting arm 130, and the elastic support member 150 acts against the first lifting arm 130, so that the first lifting arm 130 can stably rotate relative to the base 110, thereby helping the curtain connector 120 stably descend relative to the base 110.

In addition, by adopting the elastic supporting member 150 and the elastic stretching member 160 to provide the driving force for the lifting of the curtain connecting member 120 relative to the base 110, noise is reduced and user experience is improved as compared with the related art in which the curtain connecting member 120 is lifted by a motor.

In this application, the terms "mounted," "connected," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; may be a mechanical connection; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described herein, as well as features of various embodiments or examples, may be combined and combined by those skilled in the art without conflict.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.

Claims (16)

1. A projection screen, comprising:

a base;

a curtain connector;

a first lift arm including a first end hinged to the base and a second end movably hinged to the curtain connector;

the second lifting arm is hinged to the first lifting arm and comprises a third end part and a fourth end part, the third end part is hinged to the curtain connecting piece, and the fourth end part is movably hinged to the base;

the elastic support piece is suitable for driving the first lifting arm to rotate around the base and driving the curtain connecting piece to ascend relative to the base; and

and the elastic stretching piece is connected with the fourth end part and the base respectively and is suitable for providing acting force for the fourth end part to move towards the first end part.

2. The projection screen of claim 1 wherein the resilient support is a gas spring.

3. The projection screen of claim 1, further comprising a first fixed pulley rotatably coupled to the base adjacent to the first end, the axis of rotation of the first fixed pulley being the same as the direction of ascent of the curtain connector relative to the base, the elastic tension member comprising a first coupling spring and a first coupling cord coupled to the base, the first coupling cord being wound around the first fixed pulley and coupled to the fourth end.

4. The projection screen of claim 1, further comprising a hinge shaft and a thrust bearing, wherein the first lifting arm and the second lifting arm are both hinged to the hinge shaft and distributed along an axial direction of the hinge shaft, the thrust bearing is sleeved on the hinge shaft, and two thrust plates of the thrust bearing respectively prop against between the first lifting arm and the second lifting arm.

5. The projection screen of claim 1, wherein the projection screen further comprises:

a third lifting arm comprising a fifth end hinged to the base and a sixth end movably hinged to the curtain connector; and

The fourth lifting arm is hinged to the third lifting arm, the fourth lifting arm comprises a seventh end portion and an eighth end portion, the seventh end portion is hinged to the curtain connecting piece, the eighth end portion is movably hinged to the base, and a moving path of the eighth end portion and a moving path of the fourth end portion are distributed along the front-rear direction of the projection screen.

6. The projection screen of claim 5, wherein the projection screen further comprises:

one end of the elastic support is hinged to the base, the other end of the elastic support is hinged to the third lifting arm, and the elastic support is suitable for driving the third lifting arm to rotate around the base and driving the curtain connecting piece to ascend relative to the base;

the second fixed pulley is rotatably connected to the base and is close to the fifth end part, and the axial direction of the rotating shaft of the second fixed pulley is the same as the rising direction of the curtain connecting piece relative to the base;

the second connecting spring is connected with the base, the second connecting rope is wound on the second fixed pulley and connected with the eighth end part, and the second connecting spring is suitable for providing acting force for the eighth end part to move towards the fifth end part through the second connecting rope.

7. The projection screen of claim 5 further comprising a first rail, a first slider, a second rail, and a second slider, the first rail and the second rail each connected to the base and distributed along the front-to-rear direction, the first rail and the second rail each positioned between the first end and the fifth end, the first slider slidably connected to the first rail, the second slider slidably connected to the second rail, the fourth end hinged to the first slider, and the eighth end hinged to the second slider.

8. The projection screen of claim 1, wherein the projection screen further comprises:

the curtain rolling piece is rotatably connected to the base;

the output end of the driving motor is connected with the curtain winding piece; and

the curtain, the curtain has relative first end and second end, first end connect in the curtain connecting piece, the second end connect in the curtain rolling piece.

9. The projection screen of claim 8, further comprising a curtain tensioning device comprising a first elastic member, a second elastic member, a first link, and a second link, the first link being connected to the first end and the second link being connected to the second end;

The first elastic piece is connected with the first connecting rod and the curtain connecting piece respectively, and the second elastic piece is connected with the second connecting rod and the curtain winding piece respectively.

10. The projection screen of claim 9, wherein the curtain tensioning device further comprises a rotating shaft rotatably connected to a side of the curtain connecting piece facing away from the base, the curtain is wound around the rotating shaft, and the first end, the first elastic piece, and the first connecting rod are all located on the same side of the curtain connecting piece relative to the rotating shaft.

11. The projection screen of claim 10, wherein the curtain tensioning device further comprises a first cord and a second cord, the curtain further having opposed third and fourth ends, the first, second, third and fourth ends comprising the entire side of the curtain;

the third end is provided with a first channel, and the first rope penetrates through the first channel and is respectively connected with the curtain connecting piece and the curtain winding piece; the fourth end is provided with a second channel, the second rope penetrates through the second channel and is respectively connected with the curtain connecting piece and the curtain winding piece, and the first rope and the second rope are wound on the rotating shaft.

12. The projection screen of claim 11, wherein the curtain wrap is provided with an accommodation space and an opening, the opening is in communication with the accommodation space, the second elastic member, the second link, and the second end are all located in the accommodation space, and the curtain is disposed through the opening.

13. The projection screen of claim 12, further comprising a first stop member and a second stop member, wherein the first stop member has a first stop slot, the first stop member is connected to the curtain connector, and a side of the first elastic member facing away from the first link is positioned in the first stop slot; the second limiting piece is provided with a second limiting groove, the second limiting piece is connected to the curtain winding piece and located in the accommodating space, and one side, deviating from the second connecting rod, of the second elastic piece is located in the second limiting groove.

14. A projection device, comprising:

a projector; and

the projection screen of any of claims 1-13.

15. The projection device of claim 14, wherein the projection screen further comprises a mounting bracket to which the base is movably coupled in a front-to-rear direction of the projection screen, the mounting bracket being located on a side of the base facing away from the projection screen, the projector being mounted to the mounting bracket.

16. The projection device of claim 15, wherein the projection screen further comprises a plurality of rollers rotatably coupled to a side of the mounting bracket facing away from the base.

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