A new desktop projection screen

Abstract

The present invention relates to the field of projection technology, and specifically to a novel desktop projection screen, which supports the screen by setting a scissor-type support assembly; by setting a sliding rod and a rack on a first shell, setting a gear and a connecting piece on the rotating shaft of a first motor, and connecting one end of one end of the support assembly to the connecting piece, the first motor drives the support assembly to extend and retract, and the second motor is set to control the rotation of the reel, thereby controlling the opening and closing of the screen; a control module is set to control the first motor and the second motor, thereby controlling the synchronous movement of the screen and the support assembly to keep the screen stable; and a sensor is set to ensure the accurate positioning of the screen during the unfolding and folding process. The problem that the current desktop projection screen with a left-right pull-out structure has an unstable support structure and cannot support a screen with a ratio of 16:9 is solved.

Description

Technical Field

[0001] The invention relates to the field of projection technology, in particular to a novel desktop projection screen. Background Art

[0002] With the development of display technology and multimedia applications, projection equipment has been widely used in education, business and entertainment. Traditional projection screens are mostly large fixed or manually stretchable screens suitable for conference rooms, classrooms or home theaters. However, these screens have certain limitations in portability and space utilization. In order to overcome these problems, desktop projection screens came into being.

[0003] Currently, the desktop projection screens on the market use a support rod with a cross-scissor-type telescopic design, which is mainly divided into an upper and lower pull-out structure and a left and right pull-out structure. The former sets an outer shell on the upper and lower edges of the screen, and the overall size is longer when stored, occupies a large space, and has high transportation costs; the latter sets an outer shell on the left and right edges of the screen, and the overall size is shorter when stored. However, affected by the product support structure, there are currently only desktop projection screens with a screen ratio of 4:3 on the market, which cannot meet the projection needs of a ratio of 16:9.

[0004] A 16:9 screen is much wider than a 4:3 screen, which means that more factors need to be considered in the design, such as how to maintain good stability while increasing the width, how to ensure portability while setting up a larger screen, etc.

[0005] In view of the large packaging size and structural defects of small-sized desktop screens on the market, we have developed a new desktop projection screen with a stable supporting structure that can support a screen with a ratio of 16:9. Summary of the invention

[0006] To solve the problem that the support structure of the desktop projection screen that is currently pulled apart from left to right is unstable and cannot support a screen with a ratio of 16:9.

[0007] A novel desktop projection screen comprises a first shell, a second shell, a screen and a scissor-type support assembly, wherein a reel is arranged in the first shell, one side of the screen is fixed on the reel, and the other side of the screen is fixed on the second shell, and both the first shell and the second shell are used to store the screen and the support assembly; the characteristic is that: it also comprises a driving assembly and a control module; the driving assembly comprises a first motor and a second motor, both of which are arranged in the first shell and electrically connected to the control module, the first motor is used to control the extension and retraction of the support assembly, and the rotating shaft of the second motor is connected to the reel; the control module comprises a sensor for detecting the position of the first motor; wherein a sliding rod and a rack are arranged in the first shell, the first motor and the sliding rod are slidably connected, the sensor is fixed to the sliding rod, the rotating shaft of the first motor is provided with a gear meshing with the rack, the end of the rotating shaft of the first motor is provided with a connecting piece, the connecting piece is provided with a bearing, one end of one end of the support assembly is hinged to the connecting piece, the other end of one end of the support assembly is hinged to the first shell, and the other end of the support assembly is installed to the second shell, and the size of the screen is 16:9 or 21:9.

[0008] Preferably, the first shell is provided with a first slide rail, the second shell is provided with a second slide rail, the first slide rail is slidably connected to the first slider, the second slide rail is slidably connected to the second slider, the connecting member is fixed to the first slider, one end of the other end of the support assembly is hinged to the second slider, and the other end of the other end of the support assembly is hinged to the second shell.

[0009] Preferably, the control module also includes a microcontroller, an L298N dual H-bridge motor driver chip and a control button; the microcontroller is electrically connected to the sensor, the L298N dual H-bridge motor driver chip and the control button respectively; the L298N dual H-bridge motor driver chip is electrically connected to the first motor and the second motor; the control button is arranged in the first shell.

[0010] Preferably, the control buttons include an unfolding button, a retracting button and a pause button, which are respectively used to control the movement of the first motor and the second motor, thereby controlling the unfolding, retracting and pausing of the supporting assembly and the curtain.

[0011] Preferably, a novel desktop projection screen also includes a power supply, which is electrically connected to a microcontroller, an L298N dual H-bridge motor driver chip, a first motor, a second motor, and a sensor. The power supply is arranged at the bottom of the first shell, and the first shell is provided with an opening for charging the power supply.

[0012] Preferably, a first switch handle is provided on one side of the first shell, and a plug-in, a slide buckle, a spring and a slide groove are provided on the first switch handle, the plug-in and the slide buckle are fixedly connected, the slide buckle is clamped in the slide groove, the spring is arranged in the slide groove, and the top of the spring abuts against the bottom of the slide buckle; a second switch handle is provided on the second shell, and a slot is provided on the second switch handle, and when the first shell and the second shell are closed, the plug-in is inserted into the slot.

[0013] Preferably, grooves are provided on both sides of the bottom of the first shell and both sides of the bottom of the second shell, and supporting feet are hinged at the bottom of the grooves.

[0014] Preferably, pulleys are provided at the bottom of the first shell and the bottom of the second shell.

[0015] Preferably, magnets that attract each other are provided at corresponding positions of the first shell and the second shell.

[0016] Preferably, the support assembly includes a first connecting rod and a second connecting rod hinged on both sides of the first connecting rod.

[0017] The beneficial effects of the present invention are as follows: the screen is supported by setting a scissor-type support assembly; a sliding rod and a rack are set on the first shell, a gear and a connecting piece are set on the rotating shaft of the first motor, and one end of the support assembly is connected to the connecting piece, so that the first motor drives the support assembly to extend and retract, and the second motor is set to control the rotation of the reel, thereby controlling the opening and closing of the screen; a control module is set to control the first motor and the second motor, thereby controlling the synchronous movement of the screen and the support assembly to keep the screen stable; and a sensor is set to ensure the accurate positioning of the screen during the unfolding and folding process. The problem that the current desktop projection screen with a left-right pull-out structure has an unstable support structure and cannot support a screen with a ratio of 16:9 is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a rear view of a novel desktop projection screen provided by the present invention.

[0019] Figure 2 The vertical cross-sectional view is a novel desktop projection screen provided by the present invention.

[0020] Figure 3 This is a horizontal cross-sectional view of a novel desktop projection screen provided by the present invention.

[0021] Figure 4 A three-dimensional diagram of the support assembly provided by the present invention.

[0022] Figure 5 This is a schematic diagram of the drive assembly, control module and power supply connection provided by the present invention.

[0023] In the figure: 1-first shell; 11-reel; 12-slide rod; 13-rack; 14-first slide rail; 15-first slider; 16-first switch handle; 161-plug-in; 162-slide buckle; 163-spring; 164-slide groove; 2-second shell; 21-second slide rail; 22-second slider; 23-second switch handle; 3-curtain; 4-support assembly; 41-first connecting rod; 42-second connecting rod; 5-drive assembly; 51-first motor; 511-gear; 512-connector; 52-second motor; 6-control module; 61-sensor; 62-microcontroller; 63-L298N dual H-bridge motor driver chip; 64-control button; 7-power supply; 8-groove; 81-support foot; 9-pulley. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] Reference Figure 1-Figure 5A novel desktop projection screen includes a first shell 1, a second shell 2, a screen 3 and a scissor-type support assembly 4. A reel 11 is provided in the first shell 1. One side of the screen 3 is fixed on the reel 11, and the other side of the screen 3 is fixed on the second shell 2. The first shell 1 and the second shell 2 are both used to store the screen 3 and the support assembly 4. It is characterized in that it also includes a driving assembly 5 and a control module 6. The driving assembly 5 includes a first motor 51 and a second motor 52. The first motor 51 and the second motor 52 are both arranged in the first shell 1 and electrically connected to the control module 6. The first motor 51 is used to control the extension and retraction of the support assembly 4. The rotating shaft and the reel of the second motor 52 are connected to the control module 6. The control module 6 includes a sensor 61 for detecting the position of the first motor 51; wherein, a slide bar 12 and a rack 13 are provided in the first shell 1, the first motor 51 and the slide bar 12 are slidably connected, the sensor 61 is fixed to the slide bar 12, the rotating shaft of the first motor 51 is provided with a gear 511 meshing with the rack 13, the end of the rotating shaft of the first motor 51 is provided with a connecting piece 512, the connecting piece 512 is provided with a bearing, one end of one end of the support component 4 is hinged to the connecting piece 512, the other end of one end of the support component 4 is hinged to the first shell 1, and the other end of the support component 4 is installed on the second shell 2, and the size of the curtain 3 is 16:9 or 21:9.

[0027] The screen 3 is supported by setting a scissor-type support assembly 4; a slide bar 12 and a rack 13 are set on the first shell 1, a gear 511 and a connector 512 are set on the rotating shaft of the first motor 51, and one end of the support assembly 4 is connected to the connector 512, so that the first motor 51 drives the support assembly 4 to extend and retract, and the second motor 52 is set to control the rotation of the reel 11, thereby controlling the opening and closing of the screen 3; a control module 6 is set to control the first motor 51 and the second motor 52, so as to control the synchronous movement of the screen 3 and the support assembly 4, and keep the screen 3 stable. The accurate positioning of the screen 3 during the unfolding and folding process is ensured by setting a sensor 61. The problem that the current desktop projection screen with a left-right pull-out structure has an unstable support structure and cannot support a screen 3 with a ratio of 16:9 is solved.

[0028] like Figure 2As shown, two sensors 61 are provided on the slide bar 12. When the first motor 51 runs to the middle position of the slide bar 12, the curtain 3 is in a fully extended state, and the first motor 51 touches the sensor 61 located at the middle position of the slide bar 12. This sensor 61 sends a signal to the control module 6. The control module 6 processes the signal and controls the first motor 51 and the second motor 52 to suspend operation, ensuring that the curtain 3 accurately stays in the fully extended position. When the first motor 51 runs to the top of the slide bar 12, the curtain 3 is completely stored on the reel 11. The first motor 51 touches the sensor 61 located at the top of the slide bar 12. This sensor 61 sends a signal to the control module 6. The control module 6 processes the signal and controls the first motor 51 and the second motor 52 to suspend operation, ensuring that the curtain 3 accurately stays in the fully stored position. The position of the first motor 51 is detected by the sensor 61 to prevent the first motor 51 and the second motor 52 from continuing to run and causing overload or damage to the support assembly 4 and the curtain 3.

[0029] In some embodiments, Figure 1 and Figure 2 As shown, the first shell 1 is provided with a first slide rail 14, the second shell 2 is provided with a second slide rail 21, the first slide rail 14 is slidably connected to the first slider 15, the second slide rail 21 is slidably connected to the second slider 22, the connecting member 512 is fixed to the first slider 15, one end of the other end of the support component 4 is hinged to the second slider 22, and the other end of the other end of the support component 4 is hinged to the second shell 2.

[0030] The combination of the first slide rail 14 and the first slider 15, and the combination of the second slide rail 21 and the second slider 22, ensure that the support assembly 4 always maintains linear motion during movement, reducing shaking and deviation during movement. The connecting member 512 is fixed to the first slider 15: the sliding of the first slider 15 on the first slide rail 14 ensures the stable movement of the connecting member 512, thereby ensuring the precise control of the support assembly 4.

[0031] In some embodiments, Figure 5 As shown, the control module 6 also includes a microcontroller 62, an L298N dual H-bridge motor driver chip 63 and a control button 64; the microcontroller 62 is electrically connected to the sensor 61, the L298N dual H-bridge motor driver chip 63 and the control button 64 respectively; the L298N dual H-bridge motor driver chip 63 is electrically connected to the first motor 51 and the second motor 52; the control button 64 is arranged on the first shell 1.

[0032] The microcontroller 62, as the core of the control module 6, is responsible for receiving signals from the sensor 61 and the control button 64, and issuing instructions to control the operation of the first motor 51 and the second motor 52 according to these signals. The microcontroller 62 can perform complex logical operations and control algorithms to ensure the correct operation of the first motor 51 and the second motor 52. The sensor 61 is used to detect the position of the first motor 51. When the first motor 51 reaches a predetermined position, the sensor 61 sends a signal to the microcontroller 62. After receiving the signal, the microcontroller 62 stops the operation of the first motor 51 to ensure that the curtain 3 stays accurately at the desired position during the unfolding and folding process. The control button 64 is set on the first housing, and the user manually controls the unfolding and folding of the curtain 3 through the control button 64. The control button 64 is electrically connected to the microcontroller 62. After pressing the button, the microcontroller 62 will issue corresponding instructions according to the preset logic to control the operation of the motor. The user does not need complicated operation steps, and only needs to press the control button 64 to realize the opening and closing of the curtain 3, which improves the convenience of use and user experience.

[0033] Preferably, the control button 64 includes an unfolding button, a retracting button and a pause button, which are respectively used to control the movement of the first motor 51 and the second motor 52, thereby controlling the unfolding, retracting and pausing of the supporting assembly 4 and the curtain 3.

[0034] Through the independent unfolding button and retracting button, the user can clearly control the unfolding and retracting process of the curtain 3 to avoid improper states caused by misoperation. The pause button allows the user to stop the curtain 3 at any time during its movement, ensuring that the curtain 3 can stop at the required position to avoid damage caused by excessive unfolding or retracting.

[0035] Preferably, Figure 2 and Figure 5 As shown, a novel desktop projection screen also includes a power supply 7, which is electrically connected to a microcontroller 62, an L298N dual H-bridge motor driver chip 63, a first motor 51, a second motor 52 and a sensor 61. The power supply 7 is arranged at the bottom of the first shell 1, and the first shell 1 is provided with an opening for charging the power supply 7.

[0036] The power supply 7 can provide voltages of 12V and 5V, wherein the power supply with a voltage of 12V is used to power the L298N dual H-bridge motor driver chip 63, the first motor 51 and the second motor 52; the power supply with a voltage of 5V is used to power the microcontroller 62 and the sensor 61.

[0037] For example, the microcontroller 62 is an Arduino microcontroller 62: The signal output line of the sensor 61 is connected to the D6 pin of the Arduino microcontroller 62 .

[0038] The expand button is connected to the D7 pin of the Arduino microcontroller 62, the retract button is connected to the D8 pin of the Arduino microcontroller 62, and the pause button is connected to the D10 pin of the Arduino microcontroller 62. The IN1, IN2 and ENA pins of the L298N dual H-bridge motor driver chip 63 are respectively connected to the D2, D3 and D9 pins of the Arduino microcontroller 62 for controlling the first motor 51; the IN3, IN4 and ENA pins of the L298N dual H-bridge motor driver chip 63 are respectively connected to the D4, D5 and D11 pins of the Arduino microcontroller 62 for controlling the second motor 52. The first motor 51 is connected to the OUT1 and OUT2 pins of the L298N dual H-bridge motor driver chip 63. The second motor 52 is connected to the OUT3 and OUT4 pins of the L298N dual H-bridge motor driver chip 63.

[0039] In some embodiments, Figure 1 As shown, a first switch handle 16 is provided on one side of the first shell 1, and a plug-in 161, a slide buckle 162, a spring 163 and a slide groove 164 are provided on the first switch handle 16, the plug-in 161 and the slide buckle 162 are fixedly connected, the slide buckle 162 is clamped in the slide groove 164, the spring 163 is arranged in the slide groove 164, and the top of the spring 163 abuts against the bottom of the slide buckle 162; a second switch handle 23 is provided on the second shell 2, and a slot is provided on the second switch handle 23, and when the first shell 1 and the second shell 2 are closed, the plug-in 161 is inserted into the slot.

[0040] When the first shell 1 and the second shell 2 are closed, the plug-in 161 on the first switch handle 16 will be inserted into and stuck in the slot on the second switch handle 23, and the top of the spring 163 and the bottom of the slider 162 will abut, providing an elastic locking mechanism. When the user presses or slides the slider 162, the spring 163 is compressed, and the slider 162 will automatically reset after release. The plug-in 161 and the slider 162 are fixedly connected to ensure that the plug-in 161 is firmly inserted into the slot, thereby ensuring that the first shell 1 and the second shell 2 are tightly closed, preventing the curtain 3 from loosening or accidentally unfolding in the storage state. The user simply slides the slider 162 downwards to press the spring 163, so that the plug-in 161 and the slot are separated, and the first shell 1 and the second shell 2 are opened.

[0041] In some embodiments, Figure 1 As shown, grooves 8 are provided on both sides of the bottom of the first shell 1 and both sides of the bottom of the second shell 2 , and legs 81 are hinged at the bottom of the grooves 8 .

[0042] The legs 81 can be unfolded or retracted to provide stable support for the desktop projection screen. When the legs 81 are unfolded, the desktop projection screen is firmly placed on the desktop to prevent it from tipping over due to external force or vibration. When the projection screen is not needed, the legs 81 can be retracted into the groove 8. The size of the groove 8 is slightly smaller than the legs 81, so that the legs 81 can be stuck in the groove 8, making the entire desktop projection screen more compact and easy to carry and store.

[0043] In some embodiments, Figure 1 As shown, pulleys 9 are provided at the bottom of the first shell 1 and the bottom of the second shell 2 .

[0044] The pulley 9 enables the desktop projection screen to slide easily on the desktop; when the desktop projection screen needs to be unfolded or closed, the brake of the pulley 9 under the first shell 1 is pressed to keep the first shell 1 stationary, and the second shell 2 moves with the unfolding of the support assembly 4 and the screen 3; in addition, when the projection screen needs to be moved frequently, the pulley 9 can significantly reduce the user's physical exertion and improve the convenience of use.

[0045] In some embodiments, magnets that attract each other are disposed at corresponding positions of the first shell 1 and the second shell 2 .

[0046] On the one hand, the attraction between the magnets can ensure that the first shell 1 and the second shell 2 fit tightly when closed, preventing loosening or accidental opening due to external force or vibration; on the other hand, it can help the first shell 1 and the second shell 2 to automatically align when closed, reducing the trouble of manual alignment for users and making the closing operation easier.

[0047] In some embodiments, Figure 4 As shown, the support assembly 4 includes a first connecting rod 41 and a second connecting rod 42 hinged on both sides of the first connecting rod 41 .

[0048] When the support assembly 4 is extended or retracted, the hinge point between the first link 41 and the second link 42 allows the components to move relative to each other while maintaining the rigidity of the overall structure; by changing the angle between the first link 41 and the second link 42, the width can be adjusted to meet the needs of supporting curtains of different widths. When the support assembly 4 is retracted, the first link 41 and the second link 42 hinged on both sides overlap, greatly reducing the space occupied by the support assembly 4, making it easy to carry and store.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel desktop projection screen, comprising a first shell, a second shell, a screen and a scissor-type support assembly, wherein a reel is provided in the first shell, one side of the screen is fixed on the reel, and the other side of the screen is fixed on the second shell, and the first shell and the second shell are both used to store the screen and the support assembly; the characteristics are: Also includes drive components and control modules; The driving assembly includes a first motor and a second motor, both of which are arranged in the first housing and electrically connected to the control module, the first motor is used to control the extension and retraction of the supporting assembly, and the rotating shaft of the second motor is connected to the reel; The control module includes a sensor for detecting a position of the first motor; Among them, a sliding rod and a rack are provided in the first shell, the first motor and the sliding rod are slidably connected, the sensor is fixed to the sliding rod, the rotating shaft of the first motor is provided with a gear meshing with the rack, the end of the rotating shaft of the first motor is provided with a connecting piece, the connecting piece is provided with a bearing, one end of one end of the support assembly is hinged to the connecting piece, the other end of one end of the support assembly is hinged to the first shell, and the other end of the support assembly is installed on the second shell, and the size of the screen is 16:9 or 21:

9.

2. A novel desktop projection screen according to claim 1, characterized in that: The first shell is provided with a first slide rail, the second shell is provided with a second slide rail, the first slide rail is slidably connected to the first slider, the second slide rail is slidably connected to the second slider, the connecting member is fixed to the first slider, one end of the other end of the support assembly is hinged to the second slider, and the other end of the other end of the support assembly is hinged to the second shell.

3. The novel desktop projection screen according to claim 1 is characterized in that: The control module also includes a microcontroller, an L298N dual H-bridge motor driver chip and a control button; the microcontroller is electrically connected to the sensor, the L298N dual H-bridge motor driver chip and the control button respectively; The L298N dual H-bridge motor driving chip is electrically connected to the first motor and the second motor; and the control button is arranged on the first housing.

4. The novel desktop projection screen according to claim 3 is characterized in that: The control buttons include an unfolding button, a retracting button and a pause button, which are respectively used to control the movement of the first motor and the second motor, thereby controlling the unfolding, retracting and pausing of the supporting assembly and the curtain.

5. The novel desktop projection screen according to claim 3 is characterized by: It also includes a power supply, which is electrically connected to a microcontroller, an L298N dual H-bridge motor driver chip, a first motor, a second motor, and a sensor. The power supply is arranged at the bottom of the first shell, and the first shell is provided with an opening for charging the power supply.

6. The novel desktop projection screen according to claim 1 is characterized in that: A first switch handle is provided on one side of the first shell, and a plug-in, a slide buckle, a spring and a slide groove are provided on the first switch handle. The plug-in and the slide buckle are fixedly connected, the slide buckle is clamped in the slide groove, and the spring is arranged in the slide groove, and the top of the spring abuts against the bottom of the slide buckle; a second switch handle is provided on the second shell, and a slot is provided on the second switch handle. When the first shell and the second shell are closed, the plug-in is inserted into the slot.

7. The novel desktop projection screen according to claim 1 is characterized in that: Both sides of the bottom of the first shell and both sides of the bottom of the second shell are provided with grooves, and the bottoms of the grooves are hinged with supporting feet.

8. The novel desktop projection screen according to claim 1 is characterized by: Pulleys are disposed at the bottom of the first shell and the bottom of the second shell.

9. The novel desktop projection screen according to claim 1 is characterized in that: Mutually attractive magnets are disposed at corresponding positions of the first shell and the second shell.

10. The novel desktop projection screen according to claim 1 is characterized in that: The support assembly includes a first connecting rod and a second connecting rod hinged on both sides of the first connecting rod.

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