A shift mechanism and a projector

Abstract

The utility model discloses a lens shift mechanism and projector relates to projector technical field, including setting in the first mobile subassembly and second mobile subassembly of fuselage, first mobile subassembly includes first drive group and first moving plate, and first drive group can drive first moving plate and move along the height direction of fuselage, second mobile subassembly includes second moving plate and drive board, and second moving plate is connected in first moving plate slidingly, and second drive group can drive second moving plate and move along the width direction of fuselage through drive board, and lens subassembly is installed in second moving plate, thereby realizing the shift movement of lens in fuselage along the height direction and width direction, to adjust projection picture, make fuselage not need to place in the middle. Meanwhile, first moving plate and drive board all are equipped with magnet block, and the position of first moving plate and second moving plate can be detected to the TMR chip subassembly through the position of magnet block and is detected, to accurately control the position of lens, improve the accuracy of picture adjustment.

Description

Technical Field

[0001] This utility model relates to the field of projector technology, and in particular to a tilt-shifting mechanism and a projector. Background Technology

[0002] Currently, home and commercial direct-projection projectors typically require the projector to be placed directly opposite the center of the projected image, resulting in limited space utilization and poor installation flexibility. For example, in a living room setting, users need to fix the projector to the center of the wall directly opposite the screen; otherwise, the image will be offset or distorted, affecting the user experience. Traditional solutions rely on optical keystone correction or physical bracket adjustments, but the former sacrifices image quality, while the latter is cumbersome and cannot achieve precise positioning.

[0003] To address the aforementioned issues, there is an urgent need for a mechanism that can achieve high-precision tilt-shift control of the lens, enabling the projector to accurately project images even when installed in an off-center position, and supporting flexible adjustment and memory functions for the image position, thereby improving space utilization and user experience. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a tilt-shift mechanism and projector that can accurately adjust the image, improving flexibility and user experience.

[0005] A tilting mechanism according to a first aspect of the present invention includes: The camera body includes a TMR chip assembly, a lens assembly, a first moving assembly, and a second moving assembly. The first moving assembly includes a first drive group and a first moving plate, which can drive the first moving plate to move along the height direction of the camera body. The second moving assembly includes a second drive group, a second moving plate, and a drive plate. The first moving plate is slidably connected to the second moving plate. The second drive group can drive the drive plate to move. The drive plate is fastened to the second moving plate and can drive the second moving plate to move along the width direction of the camera body. The lens assembly is mounted on the second moving plate. Both the first moving plate and the drive plate are provided with magnets. The TMR chip assembly can detect the position of the first moving plate and the second moving plate by detecting the position of the magnets.

[0006] According to a first aspect embodiment of the present invention, a shaft-shifting mechanism has at least the following beneficial effects: In this embodiment, a first moving component and a second moving component are provided on the body. The first moving component includes a first drive group and a first moving plate. The first drive group can drive the first moving plate to move along the height direction of the body. The second moving component includes a second moving plate and a drive plate. The second moving plate is slidably connected to the first moving plate. The second drive group can drive the second moving plate to move along the width direction of the body through the drive plate. The lens assembly is mounted on the second moving plate. Thus, the first and second moving components enable the lens to shift along the height and width directions of the body to adjust the projected image, eliminating the need for the body to be placed in the center and improving usability. Simultaneously, both the first moving plate and the drive plate are equipped with magnets. The TMR chip assembly can detect the position of the first and second moving plates by detecting the position of the magnets, accurately controlling the lens position and improving the accuracy of image adjustment.

[0007] According to an embodiment of the first aspect of the present invention, the second movable plate has a connecting groove, and the drive plate is provided with a connecting block that can be inserted into the connecting groove. The connecting groove extends along the height direction of the machine body so that the drive plate can move relative to the second movable plate, thereby allowing the second movable plate to move along the height direction under the drive of the first movable plate.

[0008] According to an embodiment of the first aspect of the present invention, the inner wall of the machine body is provided with a plurality of first positioning pins, and the first moving plate is provided with a plurality of first limiting grooves. The first positioning pins can be inserted into the first limiting grooves, and the first limiting grooves extend along the height direction of the machine body, thereby realizing the guidance of the first moving plate moving along the height direction.

[0009] According to an embodiment of the first aspect of the present invention, the first movable plate is provided with a plurality of second positioning pins, and the second movable plate is provided with a plurality of second limiting grooves. The second positioning pins can be inserted into the second limiting grooves, and the second limiting grooves extend along the width direction of the machine body, thereby realizing the guidance of the second movable plate moving along the width direction.

[0010] According to an embodiment of the first aspect of the present invention, both the first drive group and the second drive group are provided with a motor and a first reduction wheel and a second reduction wheel that mesh with each other. The motor can drive the first reduction wheel and the second reduction wheel to rotate. Both the first moving plate and the drive plate are provided with teeth, and the second reduction wheel can mesh with the teeth to realize transmission.

[0011] According to an embodiment of the first aspect of the present invention, both the first drive group and the second drive group are provided with two second reduction gears. The second reduction gear includes a first gear ring and a second gear ring arranged concentrically. The outer diameter of the first gear ring is smaller than the outer diameter of the second gear ring. The second gear ring of one of the second reduction gears meshes with the first reduction gear, and the first gear ring of the second reduction gear meshes with the second gear ring of the other second reduction gear, thereby realizing the deceleration function and increasing the transmission torque.

[0012] According to an embodiment of the first aspect of the present invention, the body is provided with a cover plate, and a plurality of sliders are provided inside the body. A spring is provided between the sliders and the second movable plate. The spring elastically abuts against the second movable plate, and the slider abuts against the cover plate, thereby preventing the second movable plate and the first movable plate from moving along the axial direction of the lens assembly, so as to improve stability.

[0013] According to an embodiment of the first aspect of this utility model, the body is provided with a fixedly installed limiting plate, which presses against the drive plate to prevent the drive plate from moving along the axial direction of the lens assembly, thus facilitating stable transmission.

[0014] According to an embodiment of the first aspect of the present invention, the machine body is provided with a plurality of guide posts, and the drive plate has a plurality of guide grooves for inserting the guide posts. The guide grooves extend along the width direction of the machine body to guide the movement of the drive plate along the width direction.

[0015] According to an embodiment of the second aspect of this utility model, a projector is provided, including the aforementioned tilt-shifting mechanism.

[0016] The projector according to the second aspect embodiment of the present invention has at least the following beneficial effects: The projector in this embodiment includes a tilt-shift mechanism. This mechanism, through a first moving component and a second moving component, allows the first moving plate to move along the height direction of the projector body, and the second moving plate to move along the width direction of the projector body, respectively. This causes the lens assembly to shift along both the height and width directions to adjust the image, eliminating the need for the projector body to be centered and thus improving usability. Simultaneously, both the first moving plate and the drive plate are equipped with magnets. The position of these magnets is detected by a TMR chip component, which in turn detects the positions of the first and second moving plates, accurately controlling the lens position and improving the accuracy of image adjustment.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is an isometric view of a shifting mechanism according to an embodiment of the present invention; Figure 2 This is a first exploded view of a shifting axis mechanism according to an embodiment of the present utility model; Figure 3 for Figure 2 A magnified view of A in the middle; Figure 4 This is a second exploded view of a shifting axis mechanism according to an embodiment of the present utility model; Figure 5This is a first cross-sectional view of a shifting axis mechanism in an embodiment of the present utility model; Figure 6 This is a second cross-sectional view of a shifting axis mechanism in an embodiment of the present utility model.

[0019] Figure label: Body 100; TMR chip assembly 101; lens assembly 102; first positioning pin 103; slider 105; spring 106; guide post 107; limit plate 108; magnet block 109; First moving component 110; first drive group 111; first moving plate 112; extension block 113; tooth 114; first limiting groove 115; motor 116; second positioning pin 117; drive gear 118; Second moving component 120; second drive group 121; second moving plate 122; drive plate 123; connecting groove 124; second limiting groove 125; first reduction wheel 126; second reduction wheel 127; first gear ring 128; second gear ring 129; guide groove 130; mounting groove 131; connecting block 132. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figure 1 According to a first aspect embodiment of the present invention, a tilt-shifting mechanism is used to adjust the position of a lens assembly 102. The tilt-shifting mechanism includes a body 100, within which are disposed a TMR chip assembly 101, a lens assembly 102, a first moving assembly 110, and a second moving assembly 120. The first moving assembly 110 includes a first drive group 111 and a first moving plate 112, the first drive group 111 being capable of driving the first moving plate 112 to move along the height direction of the body 100. The second moving assembly 120 includes a second drive group 121, a second moving plate 122, and a drive plate 12. 3. The first movable plate 112 is slidably connected to the second movable plate 122. The second drive assembly 121 can drive the drive plate 123 to move. The drive plate 123 is fastened to the second movable plate 122 and can drive the second movable plate 122 to move along the width direction of the body 100. The lens assembly 102 is installed on the second movable plate 122. Thus, through the coordinated action of the first movable assembly 110 and the second movable assembly 120, the lens can be tilted along the height and width directions of the body 100 to adjust the projected image. The body 100 does not need to be placed in the center, thereby improving the flexibility of use. At the same time, both the first movable plate 112 and the drive plate 123 are provided with magnets 109. The TMR chip assembly 101 can detect the position of the first movable plate 112 and the second movable plate 122 by detecting the position of the magnets 109, so as to accurately control the position of the lens and improve the accuracy of image adjustment.

[0025] Specifically, refer to Figure 2 and Figure 4 The inner wall of the body 100 is provided with a plurality of first positioning pins 103, which are arranged around the outer periphery of the lens assembly 102. The first moving plate 112 is provided with a plurality of first limiting grooves 115, into which the first positioning pins 103 can be inserted. The first limiting grooves 115 extend along the height direction of the body 100, thereby guiding the first moving plate 112 to move along the height direction and achieving smooth movement. Furthermore, the first moving plate 112 is provided with a plurality of second positioning pins 117, which are arranged around the outer periphery of the lens assembly 102. The second moving plate 122 is provided with a plurality of second limiting grooves 125, into which the second positioning pins 117 can be inserted. The second limiting grooves 125 extend along the width direction of the body 100, thereby guiding the second moving plate 122 to move along the width direction and achieving smooth movement.

[0026] It is understood that the second moving plate 122 has a connecting groove 124, and the drive plate 123 is provided with a connecting block 132 that can be inserted into the connecting groove 124. The connecting groove 124 extends along the height direction of the body 100 so that the drive plate 123 can move relative to the second moving plate 122, thereby allowing the second moving plate 122 to move along the height direction under the drive of the first moving plate 112, while ensuring that the drive plate 123 can drive the second moving plate 122 to move along the width direction.

[0027] It is understood that both the first drive group 111 and the second drive group 121 are equipped with a motor 116 and a first reduction gear 126 and a second reduction gear 127 that mesh with each other. The motor 116 can drive the first reduction gear 126 and the second reduction gear 127 to rotate. Both the first moving plate 112 and the drive plate 123 are equipped with teeth 114. The second reduction gear 127 can mesh with the teeth 114 to realize transmission.

[0028] Specifically, refer to Figure 3 , Figure 5 and Figure 6 The output shaft of motor 116 is equipped with a drive gear 118, which meshes with the first reduction gear 126 to achieve a transmission connection. Both the first drive group 111 and the second drive group 121 are equipped with two meshing second reduction gears 127. Each second reduction gear 127 includes a first gear ring 128 and a second gear ring 129 arranged concentrically. The outer diameter of the first gear ring 128 is smaller than the outer diameter of the second gear ring 129. The second gear ring 129 of one second reduction gear 127 meshes with the first reduction gear 126, and the first gear ring 128 of the second reduction gear 127 meshes with the second gear ring 129 of the other second reduction gear 127, achieving a speed reduction function to increase the transmission torque and thus improve the stability of the transmission.

[0029] Reference Figure 4 The drive plate 123 has teeth 114 that mesh with the second gear ring 129 in the second drive group 121, thereby achieving a power connection between the drive plate 123 and the motor 116. Meanwhile, since the first moving plate 112 is located between the inner wall of the body 100 and the second moving plate 122, the first moving plate 112 has an extension block 113 on the side near the first drive group 111. The extension block 113 extends axially along the lens assembly 102 and has teeth 114 that mesh with the second gear ring 129 in the first drive group 111, thereby achieving a power connection between the first moving plate 112 and the motor 116.

[0030] Understandably, the camera body 100 has multiple guide posts 107, and the drive plate 123 has multiple guide slots 130 for inserting the guide posts 107. The guide slots 130 extend along the width direction of the camera body 100 to guide the movement of the drive plate 123 along the width direction. Simultaneously, the camera body 100 has a fixedly mounted limiting plate 108, which is fixed to the guide posts 107 by bolts. The limiting plate 108 can press against the drive plate 123 to prevent the drive plate 123 from moving axially along the lens assembly 102, thus facilitating stable transmission.

[0031] Understandably, the body 100 is provided with a cover plate (not shown in the figure), and the body 100 also has multiple sliders 105. A spring 106 is provided between the sliders 105 and the second moving plate 122. The spring 106 elastically abuts against the second moving plate 122, and the sliders 105 abut against the cover plate, preventing the second moving plate 122 and the first moving plate 112 from moving along the axial direction of the lens assembly 102, thereby improving stability. Furthermore, to prevent the springs 106 and sliders 105 from shifting, the second moving plate 122 has multiple mounting slots 131, in which the springs 106 and sliders 105 are embedded, facilitating positioning during installation.

[0032] To detect displacement, both the first moving plate 112 and the drive plate 123 are embedded with magnets 109. The TMR chip assembly 101 detects the position changes of the magnets 109 and provides real-time feedback of the position signals of the first moving plate 112 and the second moving plate 122, forming a closed-loop control. The TMR chip assembly 101 uses a TMR sensor (Tunnel Magneto-Resistance sensor), a high-precision magnetic sensor based on the quantum mechanical tunneling magnetoresistance effect. It is mainly used to detect changes in magnetic field strength or direction and is widely used in position detection, angle sensors, and current sensors, offering advantages such as high precision, low power consumption, and fast response. In this embodiment, the TMR chip assembly 101 accurately calculates the lens displacement by real-time detection of the magnetic field changes of the magnets 109 on the first moving plate 112 and the second moving plate 122, forming a closed-loop control. Compared to traditional photoelectric encoders or potentiometers, TMR sensors require no physical contact, are wear-free, and are resistant to dust and vibration, resulting in a longer lifespan and making them more suitable for the long-term use of projectors.

[0033] When the user adjusts the projected image position via remote control, the control system drives the motor 116 to operate according to the TMR signal until the lens moves to the target position. This design not only avoids the image quality loss of traditional keystone correction, but also records the position signal of the magnet 109 in different scenes, enabling one-click recall of preset image positions. Specifically, one TMR chip component 101 is located between the first drive group 111 and the second drive group 121, and it is located on the outer peripheral wall of the body 100, which can reduce space occupation; the other TMR chip component 101 is located on the side of the body 100 away from the drive board 123, and it is located on the outer peripheral wall of the body 100, which can reduce space occupation and help to reduce the size of the body 100.

[0034] During installation, users do not need to center the projector directly at the screen. They simply input the desired orientation and distance of the image offset via the control interface, and the tilt-shift mechanism automatically moves the lens assembly 102 to the target position. For example, when the projector is fixed to a side wall in the living room, the system uses the displacement feedback from the magnet 109 detected by the TMR to control the lens to move a certain distance to the right, thus centering the image onto the wall. If the user switches to use it in the bedroom, they can access another set of pre-stored position parameters to quickly adapt to different environments.

[0035] In a second aspect of this invention, a projector is provided that includes the aforementioned tilt-shift mechanism. It is understood that the projector includes all the technical features of the tilt-shift mechanism, and therefore the projector includes at least all the beneficial effects of the tilt-shift mechanism.

[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A tilt-shift mechanism for driving a lens assembly, characterized in that, include: The camera body includes a TMR chip assembly, a first moving assembly, and a second moving assembly. The first moving assembly includes a first drive group and a first moving plate. The first drive group can drive the first moving plate to move along the height direction of the camera body. The second moving assembly includes a second drive group, a second moving plate, and a drive plate. The second moving plate is slidably connected to the first moving plate. The second drive group can drive the drive plate to move. The drive plate is fastened to the second moving plate and can drive the second moving plate to move along the width direction of the camera body. The lens assembly is mounted on the second moving plate. Both the first moving plate and the drive plate are provided with magnets. The TMR chip assembly can detect the positions of the first moving plate and the second moving plate by detecting the position of the magnets.

2. The axis-shifting mechanism according to claim 1, characterized in that, The second movable plate has a connecting groove, and the drive plate is provided with a connecting block that can be inserted into the connecting groove. The connecting groove extends along the height direction of the body so that the drive plate can move relative to the second movable plate.

3. The axis-shifting mechanism according to claim 1, characterized in that, The inner wall of the body is provided with a plurality of first positioning pins, and the first moving plate is provided with a plurality of first limiting grooves. The first positioning pins can be inserted into the first limiting grooves, and the first limiting grooves extend along the height direction of the body.

4. The axis-shifting mechanism according to claim 1, characterized in that, The first movable plate is provided with a plurality of second positioning pins, and the second movable plate is provided with a plurality of second limiting grooves. The second positioning pins can be inserted into the second limiting grooves, and the second limiting grooves extend along the width direction of the machine body.

5. A shifting-axis mechanism according to claim 1, characterized in that, Both the first drive group and the second drive group are equipped with a motor and a first reduction gear and a second reduction gear that mesh with each other. The motor can drive the first reduction gear and the second reduction gear to rotate. Both the first moving plate and the drive plate are equipped with teeth. The second reduction gear can mesh with the teeth to realize transmission.

6. A shifting-axis mechanism according to claim 5, characterized in that, Both the first drive group and the second drive group are provided with two second reduction gears. The second reduction gear includes a first gear ring and a second gear ring arranged concentrically. The outer diameter of the first gear ring is smaller than the outer diameter of the second gear ring. The second gear ring of one of the second reduction gears meshes with the first reduction gear, and the first gear ring of the second reduction gear meshes with the second gear ring of the other second reduction gear, thereby realizing the deceleration function.

7. A shifting-axis mechanism according to claim 1, characterized in that, The machine body is provided with a cover plate, and multiple sliders are provided inside the machine body. A spring is provided between the slider and the second moving plate. The spring elastically abuts against the second moving plate, and the slider abuts against the cover plate.

8. A shifting-axis mechanism according to claim 1, characterized in that, The body is provided with a fixedly installed limiting plate, which presses against the drive plate to prevent the drive plate from moving along the axial direction of the lens assembly.

9. A shifting-axis mechanism according to claim 1, characterized in that, The body is provided with a plurality of guide posts, and the drive plate has a plurality of guide slots for inserting the guide posts, the guide slots extending along the width direction of the body.

10. A projector, characterized in that, Includes a shifting mechanism as described in any one of claims 1 to 9.

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