A projection device and system that can fine tune position according to distance

Abstract

This invention relates to the field of projection technology, specifically to a projection device and system with adjustable position based on distance. The device includes a housing and a projection mounting plate mounted on top of the housing. A rotation control base is fixedly installed inside the housing, driving the projection mounting plate to rotate at a specific angle. A limiting groove is formed on the surface of the housing, within which an extension plate is slidably limited. The surface of the extension plate has driving teeth, and an intermediate gear meshes with the external of the driving teeth. This projection device automatically adjusts the rotation angle of the projection mounting plate based on the distance to the screen detected by distance sensors on both sides, ensuring that the projection centerline of the projector is perpendicular to the screen when viewed from above, facilitating image correction during installation, adjustment, and movement of the projector.

Description

Technical Field

[0001] This invention relates to the field of projection technology, specifically to a projection device and system whose position can be finely adjusted according to distance. Background Technology

[0002] A projector is a device that converts electronic images or video signals into light signals and then amplifies and projects them onto a screen or wall through an optical system. When projecting an image, the center line of the projection must be perpendicular to the screen at a downward viewing angle to achieve a better display effect; otherwise, the projected image will be trapezoidal. Although some advanced projectors can perform trapezoidal correction to ensure that the image can be projected from the side, the trapezoidal correction performed by the internal deflection lens will lead to a decrease in image quality and blurry corners. When installing, adjusting, or moving a projector, it is sometimes necessary to ensure that the center line of the projection is perpendicular to the screen at a downward viewing angle. Manually adjusting by visual inspection is not only inefficient but also lacks precision. Summary of the Invention

[0003] The purpose of this invention is to provide a projection device and system that can finely adjust the position according to the distance, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a projection device with a position that can be finely adjusted according to distance, comprising a housing and a projection mounting plate disposed above the housing. A rotation control base is fixedly disposed inside the housing, and the rotation control base is used to drive the projection mounting plate to rotate at a specific angle. A limiting groove is formed on the surface of the housing, and an extension plate is slidably limited in the limiting groove. A driving tooth is formed on the surface of the extension plate, and an intermediate gear is engaged with the external of the driving tooth. Two sets of extension plates are provided, and the two sets of extension plates are centrally symmetrically distributed with the intermediate gear as the center. A distance measuring sensor is provided at the end of the extension plate. An internal motor is disposed inside the housing, and an automatic switching mechanism is provided between the internal motor and the intermediate gear.

[0005] The automatic switching mechanism includes a stepped turntable, an outer ring worm gear, and a positioning blind hole. The stepped turntable is coaxially and fixedly connected to the intermediate gear. The outer ring worm gear is fixedly provided on the surface of the stepped turntable. A positioning blind hole is provided in the stepped turntable, and a limiting insert is inserted into the positioning blind hole.

[0006] The surface of the limiting insert shaft is fixedly provided with an extrusion disc, the surface of the extrusion disc is fixedly provided with a ball bearing bracket, a locking ball is rotatably provided on the ball bearing bracket, the surface of the stepped turntable is provided with a ball bearing groove, and the locking ball is limited and positioned in the ball bearing groove.

[0007] The limiting insert shaft has a limiting groove inside, and a rectangular insert rod is inserted into the limiting groove. The rectangular insert rod and the limiting groove both have rectangular cross sections. The two are inserted and matched so that the rectangular insert rod can only move axially relative to the limiting groove.

[0008] A first right-angled toothed disc is fixedly mounted on the surface of the rectangular insert rod. A support spring is provided between the first right-angled toothed disc and the extrusion disc surface. A motor vertical plate is fixedly mounted between the machine housing and the internal motor. An integrated bracket is fixedly mounted on the motor vertical plate.

[0009] An active cylinder is fixedly installed in the integrated bracket. A contact ball is rolled at the end of the cylinder shaft of the active cylinder. The cylinder shaft of the active cylinder is pressed and contacted with the extrusion plate surface through the contact ball. An output air pipe is connected to the other side of the active cylinder.

[0010] A positioning base plate is fixedly installed on the inner wall surface of the housing, and a positioning optical axis is fixedly installed on the positioning base plate. A synchronization bracket is installed inside the housing, and a bracket insertion hole is opened through the surface of the synchronization bracket. The positioning optical axis passes through the bracket insertion hole. A driven cylinder is installed between the synchronization bracket and the positioning base plate. A docking air pipe is connected to the driven cylinder. The docking air pipe is connected to the output air pipe through a gas pipe. When the locking ball moves out of the ball groove, the extrusion plate moves axially towards the side facing the active cylinder, extruding the cylinder shaft of the active cylinder. This causes the active cylinder to generate a pressurized airflow, which is then input into the driven cylinder, causing the driven cylinder to extend and drive the synchronization bracket to rise.

[0011] A split worm gear is rotatably mounted in the synchronous support. The split worm gear is located below the outer ring worm wheel and the two do not contact each other. When the synchronous support rises, the split worm gear contacts and meshes with the outer ring worm wheel. A worm gear toothed disc is coaxially mounted on the outside of the split worm gear. A transmission toothed disc is meshed on the outside of the worm gear toothed disc. A transmission toothed column is coaxially mounted on the outside of the transmission toothed disc. A second right-angle toothed disc is meshed on the outside of the transmission toothed column. A movable toothed column is coaxially fixed above the second right-angle toothed disc. The movable toothed column meshes with the first right-angle toothed disc and can move axially relative to the first right-angle toothed disc.

[0012] The surface of the projection mounting plate is provided with mounting nail holes for mounting the projector, and a fixing panel is fixedly provided at the end of the extension plate, and the distance sensor is mounted on the fixing panel.

[0013] A projection system, the projection system further comprising a projector mounted on a projection mounting plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The projection device of the present invention can automatically adjust the rotation angle of the projection mounting plate according to the distance detected by the distance sensors on both sides of the screen, so that the projection center line of the projector is perpendicular to the screen when viewed from above, which facilitates image correction when installing, adjusting and moving the projector.

[0016] By using an extension plate and intermediate gear, the distance between the two sets of ranging sensors can be actively increased, thereby increasing the distance difference reported by the two sets of sensors and improving detection accuracy.

[0017] The automatic switching mechanism allows the internal motor to directly drive the intermediate gear to rotate under normal conditions, ensuring the rotational speed of the intermediate gear and enabling the extension plate to move quickly, thus improving the efficiency of the device. When the extension plate gets stuck, it automatically switches to worm gear reduction drive to increase the driving torque, allowing the extension plate to overcome the jamming point, reducing the probability of the extension plate getting stuck during operation, while ensuring the working speed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a front view of the overall structure of the present invention.

[0020] Figure 3 This is a cross-sectional view of the housing of the present invention.

[0021] Figure 4 for Figure 3 Enlarged schematic diagram of region A in the middle.

[0022] Figure 5 This is a cutaway front view of the housing of the present invention.

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of region B in the middle.

[0024] Figure 7 This is a three-dimensional half-sectional schematic diagram of the present invention.

[0025] Figure 8 for Figure 7 Enlarged schematic diagram of region C in the middle.

[0026] Figure 9 for Figure 8 Enlarged schematic diagram of region D in the middle.

[0027] Figure 10 This is a schematic diagram of the component structure of the present invention.

[0028] In the diagram: 1. Housing; 2. Projection mounting plate; 3. Rotation control base; 4. Limiting groove; 5. Extension plate; 6. Drive gear; 7. Intermediate gear; 8. Distance sensor; 9. Internal motor; 701. Stepped turntable; 702. Outer ring worm gear; 703. Positioning blind hole; 704. Limiting insert shaft; 705. Extrusion disc surface; 706. Ball bearing bracket; 707. Locking ball; 708. Ball bearing groove; 709. Limiting rectangular groove; 710. Rectangular insert rod; 711. First right-angled gear plate; 712. Support 713. Spring; 714. Motor vertical plate; 715. Integrated bracket; 716. Active cylinder; 717. Contact ball; 718. Output air pipe; 719. Positioning base plate; 720. Positioning optical axis; 721. Synchronization bracket; 722. Bracket insertion hole; 723. Driven cylinder; 724. Connecting air pipe; 725. Split worm gear; 726. Worm gear disc; 727. Transmission gear disc; 728. Transmission gear column; 729. Second right-angle gear disc; 201. Movable gear column; 501. Mounting pin hole; 501. Fixed panel. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 10 This invention provides a technical solution: a projection device with a finely adjustable position according to distance, comprising a housing 1 and a projection mounting plate 2 disposed above the housing 1. A rotation control base 3 is fixedly disposed inside the housing 1. The rotation control base 3 is composed of a reduction mechanism and a servo or stepper motor, which can perform precise rotation angle control and can self-lock after stopping. The rotation control base 3 is used to drive the projection mounting plate 2 to rotate at a specific angle. A limit groove 4 is formed on the surface of the housing 1. An extension plate 5 is slidably limited in the limit groove 4. A drive tooth 6 is formed on the surface of the extension plate 5. An intermediate gear 7 is meshed on the outside of the drive tooth 6. There are two sets of extension plates 5, and the two sets of extension plates 5 are centrally symmetrically distributed with the intermediate gear 7 as the center. A distance sensor 8 is disposed at the end of the extension plate 5. An internal motor 9 is disposed inside the housing 1. An automatic switching mechanism is disposed between the internal motor 9 and the intermediate gear 7.

[0031] The automatic switching mechanism includes a stepped turntable 701, an outer ring worm gear 702, and a positioning blind hole 703. The stepped turntable 701 is coaxially and fixedly connected to the intermediate gear 7. The outer ring worm gear 702 is fixedly provided on the surface of the stepped turntable 701. The positioning blind hole 703 is provided in the stepped turntable 701, and a limiting insert shaft 704 is inserted into the positioning blind hole 703.

[0032] The surface of the limiting insert shaft 704 is fixedly provided with an extrusion disc 705, the surface of the extrusion disc 705 is fixedly provided with a ball bearing bracket 706, a locking ball 707 is rotatably provided on the ball bearing bracket 706, and a ball groove 708 is opened on the surface of the stepped turntable 701, and the locking ball 707 is limited and provided in the ball groove 708.

[0033] The limiting insert shaft 704 has a limiting rectangular groove 709 inside, and a rectangular insert rod 710 is inserted in the limiting rectangular groove 709. The rectangular insert rod 710 and the limiting rectangular groove 709 both have rectangular cross sections. The two are inserted and matched, so that the rectangular insert rod 710 can only move axially relative to the limiting rectangular groove 709.

[0034] A first right-angled toothed disc 711 is fixedly installed on the surface of the rectangular insert 710. A support spring 712 is installed between the first right-angled toothed disc 711 and the extrusion disc surface 705. A motor vertical plate 713 is fixedly installed between the machine housing 1 and the internal motor 9. An integrated bracket 714 is fixedly installed on the motor vertical plate 713.

[0035] An active cylinder 715 is fixedly installed in the integrated bracket 714. A contact ball 716 is rolled at the end of the cylinder shaft of the active cylinder 715. The cylinder shaft of the active cylinder 715 is pressed into contact with the extrusion plate surface 705 through the contact ball 716. The contact ball 716 can reduce the contact friction between the cylinder shaft of the active cylinder 715 and the extrusion plate surface 705. An output air pipe 717 is connected to the other side of the active cylinder 715.

[0036] A positioning base plate 718 is fixedly installed on the inner wall surface of the housing 1. A positioning optical axis 719 is fixedly installed on the positioning base plate 718. A synchronization bracket 720 is installed inside the housing 1. A bracket insertion hole 721 is opened through the surface of the synchronization bracket 720. The positioning optical axis 719 passes through the bracket insertion hole 721. A driven cylinder 722 is installed between the synchronization bracket 720 and the positioning base plate 718. A docking air pipe 723 is connected to the driven cylinder 722. The docking air pipe 723 is connected to the output air pipe 717 through a gas pipe. When the locking ball 707 moves from the ball groove 70 When the cylinder is removed from the 8th cylinder, the extrusion disc 705 moves axially toward the side facing the active cylinder 715, extruding the cylinder shaft of the active cylinder 715. This causes the active cylinder 715 to generate a pressurized airflow, which is then input into the driven cylinder 722. This causes the driven cylinder 722 to extend and drive the synchronous support 720 to rise. Both the active cylinder 715 and the driven cylinder 722 are cylinder structures, each consisting of a piston. A spring is provided on one side of the piston of the active cylinder 715, allowing the cylinder shaft of the active cylinder 715 to extend and reset after the extrusion is removed, thereby causing the cylinder shaft of the driven cylinder 722 to retract.

[0037] A split worm gear 724 is rotatably mounted in the synchronous support 720. The split worm gear 724 is located below the outer ring worm wheel 702, and the two do not contact each other. When the synchronous support 720 rises, the split worm gear 724 contacts and meshes with the outer ring worm wheel 702. A worm gear disk 725 is coaxially mounted on the outside of the split worm gear 724. A transmission gear disk 726 is meshed on the outside of the worm gear disk 725. A transmission gear column 727 is coaxially mounted on the outside of the transmission gear disk 726. A second right-angle gear disk 728 is meshed on the outside of the transmission gear column 727. A movable gear column 729 is coaxially fixed above the second right-angle gear disk 728. The movable gear column 729 meshes with the first right-angle gear disk 711, and the movable gear column 729 can move axially relative to the first right-angle gear disk 711.

[0038] The surface of the projection mounting plate 2 is provided with mounting nail holes 201 for mounting the projector, and the end of the extension plate 5 is fixedly provided with a fixing panel 501, and the distance sensor 8 is mounted on the fixing panel 501.

[0039] A projection system, the projection system further comprising a projector mounted on a projection mounting plate 2.

[0040] When the projection device of this invention is in use, the projector is mounted on the projection mounting plate 2. Initially, the projection direction of the projector is the same as the distance measurement direction of the distance sensor 8. When fine-tuning of the position is required, the intermediate gear 7 is first controlled to rotate, and the two sets of extension plates 5 extend in opposite directions at the same time, which increases the distance between the two sets of distance sensors 8. When the distance sensors 8 are extended into place, the two sets of distance sensors 8 detect the distance between the screens respectively. The difference is obtained based on the feedback result. According to the Pythagorean theorem, the difference is the length of one right-angled side of a right triangle. The distance between the two sets of distance sensors 8 is known and is the length of the other right-angled side. At this time, the included angle and sides of the entire triangle can be calculated. Therefore, the deflection angle of the housing 1 can be obtained. At this time, the rotation control base 3 drives the projection mounting plate 2 to rotate, so that the projection mounting plate 2 and the projector compensate for the above deflection angle, ensuring that the projection center line of the projector is perpendicular to the screen at the top view angle.

[0041] In the above process, the internal motor 9 is used to drive the intermediate gear 7 to rotate, such as Figure 9 As shown, when there is no jamming problem during the extension process of the extension plate 5, the internal motor 9 drives the rectangular insert rod 710 to rotate, causing the limiting insert shaft 704 to rotate. The limiting insert shaft 704 and the locking ball 707 rotate synchronously. At this time, the locking ball 707 is located in the ball groove 708, and can drive the stepped turntable 701 to rotate through the limiting, and finally cause the intermediate gear 7 to rotate. In this process, the speed of the internal motor 9 directly drives the intermediate gear 7 at a ratio of one to one, so that the intermediate gear 7 can have a faster speed.

[0042] When the extension plate 5 gets stuck during its extension process, the intermediate gear 7 and the stepped turntable 701 are resisted and cannot rotate. This ensures that the torque of the internal motor 9 is sufficient to make the locking ball 707 roll out of the ball groove 708. At this time, the locking ball 707 separates from the ball groove 708, the limiting shaft 704 moves toward the support spring 712, the support spring 712 is compressed, and the limiting shaft 704 will rotate relative to the stepped turntable 701.

[0043] When the limiting insert shaft 704 moves towards the support spring 712, the extrusion disc 705 moves axially towards the side facing the active cylinder 715, extruding pressure on the cylinder shaft of the active cylinder 715. This causes the active cylinder 715 to generate pressurized airflow, which is then input into the driven cylinder 722, causing the driven cylinder 722 to extend and drive the synchronous bracket 720 to rise. Figure 8 As shown, when the synchronous support 720 rises, it will cause the split worm gear 724 to contact and mesh with the outer ring worm gear 702. Since the limiting insert shaft 704, the rectangular insert rod 710, and the first right-angle gear disk 711 rotate relative to the stepped turntable 701, the first right-angle gear disk 711 drives the movable gear column 729 to rotate by meshing with it. Figure 10As shown, after being driven sequentially by the second right-angle gear plate 728, the transmission gear column 727, the transmission gear plate 726, and the worm gear plate 725, the split worm 724 rotates. The split worm 724 contacts and meshes with the outer ring worm wheel 702, driving the outer ring worm wheel 702 and the stepped turntable 701 to rotate at low speed and high torque, thereby overcoming the jamming. After breaking through the jamming point, the locking ball 707 rotates one revolution and returns to the ball groove 708. At this time, the cylinder shaft of the active cylinder 715 loses the compression and extends, thereby causing the driven cylinder 722 to retract, and the synchronous bracket 720 descends and resets.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A projection device with adjustable position based on distance, comprising a housing (1) and a projection mounting plate (2) disposed above the housing (1), characterized in that: A rotation control base (3) is fixedly installed inside the housing (1). The rotation control base (3) is used to drive the projection mounting plate (2) to rotate at a specific angle. A limit groove (4) is opened on the surface of the housing (1). An extension plate (5) is slidably limited in the limit groove (4). A drive tooth (6) is opened on the surface of the extension plate (5). An intermediate gear (7) is meshed with the external of the drive tooth (6). There are two sets of extension plates (5), and the two sets of extension plates (5) are centrally symmetrically distributed with the intermediate gear (7) as the center. A distance sensor (8) is installed at the end of the extension plate (5). The housing (1) is equipped with a... An internal motor (9) is provided with an automatic switching mechanism between the internal motor (9) and the intermediate gear (7); the automatic switching mechanism includes a stepped turntable (701), an outer ring worm gear (702), and a positioning blind hole (703). The stepped turntable (701) is coaxially and fixedly connected to the intermediate gear (7). An outer ring worm gear (702) is fixedly provided on the surface of the stepped turntable (701). A positioning blind hole (703) is provided in the stepped turntable (701), and a limiting insert (704) is inserted into the positioning blind hole (703). An extrusion disc surface (705) is fixedly provided on the surface of the limiting insert (704), and a roller is fixedly provided on the surface of the extrusion disc surface (705). A ball support (706) is provided, on which locking balls (707) are rotatably mounted. A ball groove (708) is provided on the surface of the stepped turntable (701), and the locking balls (707) are limited in the ball groove (708). A limiting groove (709) is provided inside the limiting insert shaft (704), and a rectangular insert rod (710) is inserted in the limiting groove (709). The rectangular insert rod (710) and the limiting groove (709) are both rectangular in cross-section. The two are inserted and matched so that the rectangular insert rod (710) can only move axially relative to the limiting groove (709). A first right-angle toothed disc is fixedly provided on the surface of the rectangular insert rod (710). (711), a support spring (712) is provided between the first right-angle toothed disc (711) and the extrusion disc surface (705), a motor vertical plate (713) is fixedly provided between the machine housing (1) and the internal motor (9), and an integrated bracket (714) is fixedly provided on the motor vertical plate (713); an active cylinder (715) is fixedly provided in the integrated bracket (714), a contact ball (716) is rolled at the end of the cylinder shaft of the active cylinder (715), and the cylinder shaft of the active cylinder (715) is pressed and contacted with the extrusion disc surface (705) through the contact ball (716), and an output air pipe (717) is connected to the other side of the active cylinder (715).A positioning base plate (718) is fixedly installed on the inner wall surface of the housing (1). A positioning optical axis (719) is fixedly installed on the positioning base plate (718). A synchronization bracket (720) is installed inside the housing (1). A bracket insertion hole (721) is opened through the surface of the synchronization bracket (720). The positioning optical axis (719) passes through the bracket insertion hole (721). A driven cylinder (72) is installed between the synchronization bracket (720) and the positioning base plate (718). 2) A docking air pipe (723) is connected to the driven cylinder (722). The docking air pipe (723) is connected to the output air pipe (717) through a gas pipe. When the locking ball (707) moves out of the ball groove (708), the extrusion disc (705) moves axially towards the side facing the active cylinder (715), extruding the cylinder shaft of the active cylinder (715). This causes the active cylinder (715) to generate a pressurized airflow, which is then input into the driven cylinder (722), causing the driven cylinder (722) to... The cylinder (722) extends, driving the synchronous support (720) to rise; a split worm gear (724) is rotatably installed in the synchronous support (720), the split worm gear (724) is located below the outer ring worm wheel (702), and the two do not contact each other. When the synchronous support (720) rises, the split worm gear (724) contacts and meshes with the outer ring worm wheel (702). A worm gear disk (725) is coaxially installed on the outside of the split worm gear (724). A transmission gear disc (726) is meshed with the transmission gear disc (726), and a transmission gear column (727) is coaxially disposed on the outside of the transmission gear disc (726). A second right-angle gear disc (728) is meshed with the outside of the transmission gear column (727). A movable gear column (729) is coaxially fixedly disposed above the second right-angle gear disc (728). The movable gear column (729) meshes with the first right-angle gear disc (711), and the movable gear column (729) can move axially relative to the first right-angle gear disc (711).

2. The projection device with adjustable position according to distance according to claim 1, characterized in that: The surface of the projection mounting plate (2) is provided with mounting nail holes (201) for mounting the projector, and the end of the extension plate (5) is fixedly provided with a fixing panel (501), and the distance sensor (8) is mounted on the fixing panel (501).

3. A projection system employing a projection device as described in claim 1 or 2, characterized in that: The projection system also includes a projector mounted on a projection mounting plate (2).

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