Projector with image correction function

Abstract

The invention relates to a projector with an image correction function. The projector comprises a shell, a projection lens, an imaging module, a light source module, a first adjusting assembly and a second adjusting assembly, the projection lens is arranged on one side face of the shell, the imaging module comprises a rear Fresnel lens, an LCD screen, a front Fresnel lens and a reflective mirror, the front Fresnel lens is installed on the first adjusting assembly and can turn over relative to the shell, and the reflective mirror is installed on the rear Fresnel lens and can turn over relative to the shell. According to the projector provided by the embodiment of the invention, under the condition that the placement angle and position of the projector are not moved, the edge of a projected picture can be better focused, the definition of the projector is effectively improved, and the projection effect of the projector is improved. And moreover, trapezoidal correction can be carried out on the projected picture, so that the picture can be ensured to be square even during side projection, and the user experience can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of projectors, and in particular to a projector with an image correction function. Background Art

[0002] With the continuous advancement of projector technology, portable projectors have emerged that are easy to carry and use for projection anytime. Unlike traditional fixed-mount projectors, portable projectors are more adaptable to various projection environments. When projecting onto a screen or wall at different angles, the image may become a trapezoid or a non-rectangular parallelogram. In this case, image correction is necessary, such as by repositioning the projector, performing digital keystone correction, or applying optical keystone correction. Projectors without keystone correction require significant time to adjust the device's position. The disadvantage of digital keystone correction is image compression, resulting in less-than-ideal image clarity. Optical keystone correction has little impact on image quality. Digital keystone correction can be manually or automatically applied, while optical keystone correction requires manual adjustment, which is more inconvenient. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide a projector with an image correction function.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A projector with an image correction function, comprising:

[0006] A housing, a projection lens, and an imaging module, a light source module, a first adjustment component, and a second adjustment component disposed in the housing;

[0007] The projection lens is disposed on a side surface of the housing. The imaging module includes a rear Fresnel lens, an LCD screen, a front Fresnel lens, and a reflector. The light source provided by the light source module passes through the rear Fresnel lens, the LCD screen, the front Fresnel lens, and the reflector in sequence, and is then emitted from the projection lens to the outside of the housing. The front Fresnel lens is mounted on a first adjustment assembly so as to be flippable relative to the housing. The first adjustment assembly includes a first horizontal adjustment mechanism and a first vertical adjustment mechanism. The first horizontal adjustment mechanism is used to adjust the flip angle of the front Fresnel lens around the horizontal direction, and the first vertical adjustment mechanism is used to adjust the flip angle of the front Fresnel lens around the vertical direction. The reflector is mounted on a second adjustment assembly so as to be flippable relative to the housing. The second adjustment assembly includes a second horizontal adjustment mechanism and a second vertical adjustment mechanism. The second horizontal adjustment mechanism is used to adjust the flip angle of the reflector around the horizontal direction, and the second vertical adjustment mechanism is used to adjust the flip angle of the reflector around the vertical direction.

[0008] A control mainboard is provided on the shell, and a six-axis gyroscope is mounted on the control mainboard.

[0009] As an embodiment, the first horizontal adjustment mechanism includes a first outer frame and a first motor, a first horizontal rotating shaft is provided on both sides of the first outer frame, the first outer frame is rotatably connected to the shell in the horizontal direction through the first horizontal rotating shaft, the first motor is fixed inside the shell, and the output shaft of the first motor is driven and connected to the first outer frame through a first transmission structure, the first vertical adjustment mechanism is arranged in the first outer frame, and the front Fresnel lens is fixed on the first vertical adjustment mechanism.

[0010] As an embodiment, the first vertical adjustment mechanism includes a first inner frame and a second motor, and a first vertical rotating shaft is provided at the upper and lower ends of the first inner frame. The first inner frame is rotatably connected to the first outer frame through the first vertical rotating shaft, and the second motor is fixed on the first outer frame. The output shaft of the second motor is drivingly connected to the first inner frame through a second transmission structure, and the front Fresnel lens is fixed in the first inner frame.

[0011] As an embodiment, the second horizontal adjustment mechanism includes a second outer frame and a third motor, a second horizontal rotating shaft is provided on both sides of the second outer frame, the second outer frame is rotatably connected to the shell in the horizontal direction through the second horizontal rotating shaft, the third motor is fixed inside the shell, and the output shaft of the third motor is driven and connected to the second outer frame through a third transmission structure, the second vertical adjustment mechanism is arranged in the second outer frame, and the reflector is fixed on the second vertical adjustment mechanism.

[0012] As an embodiment, the second vertical adjustment mechanism includes a second inner frame and a fourth motor, and a second vertical rotating shaft is provided at the upper and lower ends of the second inner frame. The second inner frame is rotatably connected to the second outer frame through the second vertical rotating shaft, and the fourth motor is fixed on the second outer frame. The output shaft of the fourth motor is driven and connected to the second inner frame through a fourth transmission structure, and the reflector is fixed in the second inner frame.

[0013] As an embodiment, the second horizontal adjustment mechanism includes a second horizontal sensor for detecting a rotation angle of the second outer frame, and the second vertical adjustment mechanism includes a second vertical sensor for detecting a rotation angle of the second inner frame.

[0014] As an embodiment, the second transmission structure includes an eccentric wheel arranged on the output shaft of the second motor and a connecting rod arranged on one side of the first inner frame, a sliding groove is provided in the connecting rod, and the eccentric shaft on the eccentric wheel is inserted into the sliding groove. The second motor drives the eccentric wheel to rotate to drive the connecting rod to make the first inner frame rotate around the first vertical rotation axis.

[0015] As an embodiment, a first limiting structure is provided between the first outer frame and the shell, and a second limiting structure is provided between the first outer frame and the first inner frame.

[0016] As an embodiment, a third limiting structure is provided between the second outer frame and the shell, and a fourth limiting structure is provided between the second outer frame and the second inner frame.

[0017] The projector of the embodiment of the present application enables the edges of the projected image to be better focused without moving the projector's placement angle and position, thereby effectively improving its clarity. It can also perform trapezoidal correction on the projected image, ensuring that the image is square even when projecting from the side, which is beneficial to improving user experience.

[0018] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the external structure of the projector in the embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the internal structure of the projector in the embodiment of the present application;

[0021] Figure 3 This is a schematic structural diagram of the first adjustment component and the front Fresnel lens in an embodiment of the present application;

[0022] Figure 4Schematic diagram of an explosion of the first adjustment component and the front Fresnel lens in an embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of the second adjustment component and the reflector in an embodiment of the present application;

[0024] Figure 6 This is an exploded schematic diagram of the second adjustment component and the reflector in the embodiment of the present application;

[0025] Description of reference numerals:

[0026] 1. Housing; 2. Projection lens; 31. Rear Fresnel lens; 32. LCD screen; 33. Front Fresnel lens; 34. Reflector; 4. Light source module; 5. First adjustment assembly; 51. First horizontal adjustment mechanism; 511. First outer frame; 5110. First horizontal rotation axis; 512. First motor; 513. First transmission structure; 52. First vertical adjustment mechanism; 521. First inner frame; 5211. First vertical rotation axis; 522. Second motor; 523. Second transmission structure; 5231. Eccentric wheel; 52 32. Eccentric shaft; 5233. Connecting rod; 5234. Slide; 6. Second adjustment assembly; 61. Second horizontal adjustment mechanism; 611. Second outer frame; 6110. Second horizontal rotation axis; 612. Third motor; 613. Third transmission structure; 614. Second horizontal sensor; 62. Second vertical adjustment mechanism; 621. Second inner frame; 6110. Second horizontal rotation axis; 6211. Frame body; 6212. Mirror pressure plate; 622. Fourth motor; 623. Fourth transmission structure; 624. Second vertical sensor. DETAILED DESCRIPTION

[0027] To further illustrate various embodiments, the present invention includes accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will readily understand other possible implementations and the advantages of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] See also Figures 1 to 6This embodiment provides a projector with an image correction function, including: a housing 1, a projection lens 2, and an imaging module, a light source module 4, a first adjustment component 5, and a second adjustment component 6 arranged in the housing 1.

[0030] The projection lens 2 is arranged on a side surface of the housing 1, the imaging module includes a rear Fresnel lens 31, an LCD screen 32, a front Fresnel lens 33 and a reflector 34, and the light source module 4 is used to provide a light source, wherein the light provided by the light source module 4 passes through the rear Fresnel lens 31, the LCD screen 32, the front Fresnel lens 33 and the reflector 34 in sequence, and is then emitted from the projection lens 2 to the outside of the housing 1. The light emitted from the light source module 4 is transmitted through the above-mentioned components and can be projected by the projection lens 2 to form a projection image.

[0031] The front Fresnel lens 33 can be flipped relative to the shell 1 by being installed on the first adjustment component 5. The first adjustment component 5 includes a first horizontal adjustment mechanism 51 and a first vertical adjustment mechanism 52. The first horizontal adjustment mechanism 51 is used to adjust the flip angle of the front Fresnel lens 33 around the horizontal direction, and the first vertical adjustment mechanism 52 is used to adjust the flip angle of the front Fresnel lens 33 around the vertical direction. The reflector 34 can be flipped relative to the shell 1 by being installed on the second adjustment component 6. The second adjustment component 6 includes a second horizontal adjustment mechanism 61 and a second vertical adjustment mechanism 62. The second horizontal adjustment mechanism 61 is used to adjust the flip angle of the reflector 34 around the horizontal direction, and the second vertical adjustment mechanism 62 is used to adjust the flip angle of the reflector 34 around the vertical direction.

[0032] By arranging the front Fresnel lens 33 and the reflective mirror 34 on the first adjustment assembly 5 and the second adjustment assembly 6, respectively, and adjusting the horizontal and vertical angles of the front Fresnel lens 33 using the first horizontal adjustment mechanism 51 and the first vertical adjustment mechanism 52, the distance between the left and right sides, or the top and bottom sides, of the front Fresnel lens 33 and the projection lens 2 can be adjusted, thereby correcting the shape of the image and correcting the trapezoidal or non-rectangular parallelogram shape produced when the projector is projected sideways. Conversely, by adjusting the horizontal and vertical angles of the reflective mirror 34 using the second horizontal adjustment mechanism 61 and the second vertical adjustment mechanism 62, the object distance between the left and right sides, or the top and bottom sides, of the reflective mirror 34 and the projection lens 2 can be adjusted. When the projector is projecting sideways, the image distances between the projection lens 2 and the left and right or upper and lower sides of the projected screen are inconsistent, causing the projected image to be extended and out of focus. The object distance can be adjusted to compensate for the image distance deviation, so that the image projected by the LCD screen 32 through the projection lens 2 meets the convex lens imaging principle, thereby solving the out-of-focus problem at the edge of the image caused by side projection, and thus solving the problem of insufficient clarity of the side-projected image.

[0033] Through the above settings, it can be seen that the projector of the embodiment of the present application can better focus the edges of the projected picture without moving the placement angle and position of the projector, and its clarity is effectively improved. It can also perform trapezoidal correction on the projected picture, and the squareness of the picture can be guaranteed even when projecting from the side, which is conducive to improving user experience.

[0034] Preferably, the housing 1 is provided with a control mainboard, on which a six-axis gyroscope is mounted. Upon detecting movement / flipping of the projector by the gyroscope, the projection lens 2 can be driven to refocus the center. After center focus is achieved, the first adjustment component 5 and the second adjustment component 6 perform corresponding keystone correction and secondary edge focus, thereby automatically completing keystone correction and improving clarity, ensuring image clarity, brightness, and a squared image. A TOG sensor can also be used to measure the distance from the projection lens 2 to the top, bottom, left, and right of the projected image. Based on this distance, the control mainboard controls the movement of the first adjustment component 5 and the second adjustment component 6 to implement keystone correction and image clarity adjustment functions.

[0035] The first horizontal adjustment mechanism 51 includes a first outer frame 511 and a first motor 512. First horizontal rotation shafts 5110 are provided on both sides of the first outer frame 511. The first outer frame 511 is rotatably connected to the shell 1 in the horizontal direction through the first horizontal rotation shaft 5110. The first motor 512 is fixed inside the shell 1. The output shaft of the first motor 512 is driven and connected to the first outer frame 511 through the first transmission structure 513. The first vertical adjustment mechanism 52 is arranged in the first outer frame 511, and the front Fresnel lens 33 is fixed on the first vertical adjustment mechanism 52.

[0036] The first vertical adjustment mechanism 52 includes a first inner frame 521 and a second motor 522. The first inner frame 521 is provided with a first vertical rotating shaft 5211 at the upper and lower ends. The first inner frame 521 is rotatably connected to the first outer frame 511 through the first vertical rotating shaft 5211. The second motor 522 is fixed on the first outer frame 511. The output shaft of the second motor 522 is driven and connected to the first inner frame 521 through a second transmission structure 523. The front Fresnel lens 33 is fixed in the first inner frame 521.

[0037] The first transmission structure 513 is driven by the first motor 512 to rotate the first outer frame 511 in the horizontal direction around the first horizontal rotation axis 5110, and the first vertical adjustment mechanism 52 and the front Fresnel lens 33 arranged in the first outer frame 511 are rotated in the horizontal direction, so that the projection image is adjusted in the vertical direction, so that when the projector is projected up and down, the left and right sides of the image remain vertically parallel; the second motor 522 is used to drive the second transmission structure 523 to rotate the first inner frame 521 around the first vertical rotation axis 5211 in the first outer frame 511, thereby driving the front Fresnel lens 33 to rotate in the vertical direction, so that the projection image is adjusted in the horizontal direction, so that when the projector is projected left and right, the upper and lower sides of the image remain horizontally parallel, thereby achieving trapezoidal correction.

[0038] In this embodiment, the first transmission structure 513 includes a gear provided on the output shaft of the first motor 512 and a tooth structure provided on the first outer frame 511 , and the gear is engaged with the tooth structure, so that the first motor 512 can drive the first outer frame 511 to rotate.

[0039] The second transmission structure 523 includes an eccentric wheel 5231 disposed on the output shaft of the second motor 522 and a connecting rod 5233 disposed on a side of the first inner frame 521. The connecting rod 5233 is provided with a slide groove 5234, into which the eccentric shaft 5232 on the eccentric wheel 5231 is inserted. The second motor 522 drives the eccentric wheel 5231 to rotate, thereby driving the connecting rod 5233 to rotate the first inner frame 521 about the first vertical rotation axis 5211. This configuration of the second transmission structure 523 can make the overall layout more reasonable. By connecting the connecting rod 5233 to the side of the first inner frame 521, the second motor 522 does not need to be arranged in the middle of the first outer frame 511, but only needs to be arranged on one side of the first inner frame 521, so as not to block the propagation of light.

[0040] Preferably, a first limiting structure is provided between the first outer frame 511 and the housing 1. The first limiting structure is used to limit the relative rotation angle of the first outer frame 511 and the housing 1 to prevent excessive rotation. A second limiting structure is provided between the first outer frame 511 and the first inner frame 521. The second limiting structure is used to limit the relative rotation angle of the first outer frame 511 and the first inner frame 521 to prevent excessive rotation.

[0041] The second horizontal adjustment mechanism 61 includes a second outer frame 611 and a third motor 612. Second horizontal rotation shafts 6110 are provided on both sides of the second outer frame 611. The second outer frame 611 is rotatably connected to the shell 1 in the horizontal direction through the second horizontal rotation shaft 6110. The third motor 612 is fixed inside the shell 1. The output shaft of the third motor 612 is driven and connected to the second outer frame 611 through the third transmission structure 613. The second vertical adjustment mechanism 62 is arranged in the second outer frame 611, and the reflector 34 is fixed on the second vertical adjustment mechanism 62.

[0042] The second vertical adjustment mechanism 62 includes a second inner frame 621 and a fourth motor 622. Second vertical rotating shafts 6210 are provided at the upper and lower ends of the second inner frame 621. The second inner frame 621 is rotatably connected to the second outer frame 611 through the second vertical rotating shaft 6210. The fourth motor 622 is fixed on the second outer frame 611. The output shaft of the fourth motor 622 is driven and connected to the second inner frame 621 through the fourth transmission structure 623. The reflector 34 is fixed in the second inner frame 621.

[0043] The third transmission structure 613 is driven by the third motor 612 to rotate the second outer frame 611 in the horizontal direction around the second horizontal rotation axis 6110, and the second vertical adjustment mechanism 62 and the reflector 34 arranged in the second outer frame 611 are rotated in the horizontal direction to achieve the adjustment of the projection image in the vertical direction, so that the upper and lower edges of the image are clearer when the projector is projected up and down; the fourth transmission structure 623 is driven by the fourth motor 622 to rotate the second inner frame 621 around the second vertical rotation axis 6210 in the second outer frame 611, thereby driving the reflector 34 to rotate in the vertical direction, so that the projection image is adjusted in the horizontal direction, so that the left and right edges of the projection image are clearer when the projector is projected left and right.

[0044] In this embodiment, the third transmission structure 613 and the fourth transmission structure 623 are both gear tooth transmission structures. That is, the third transmission structure includes a gear provided on the output shaft of the third motor 612 and a gear structure provided on the second outer frame 611. The gear meshes with the gear structure, so that the third motor 612 can drive the second outer frame 611 to rotate. The fourth transmission structure includes a gear provided on the output shaft of the fourth motor 622 and a gear structure provided on the second inner frame 621. The gear meshes with the gear structure, so that the fourth motor 622 can drive the second inner frame 621 to rotate.

[0045] Preferably, the second horizontal adjustment mechanism 61 includes a second horizontal sensor 614 for detecting the rotation angle of the second outer frame 611, and the second vertical adjustment mechanism 62 includes a second vertical sensor 624 for detecting the rotation angle of the second inner frame 621. The second horizontal sensor 614 and the second vertical sensor 624 are used to detect the rotation angles of the second outer frame 611 and the second inner frame 621, respectively, thereby precisely controlling the specific rotation of the reflector 34. The second horizontal sensor 614 and the second vertical sensor 624 are both optical coupling sensors, and the second outer frame 611 and the second inner frame 621 are each provided with a code disk corresponding to the respective optical coupling sensors.

[0046] A third limiting structure is provided between the second outer frame 611 and the housing 1. The third limiting structure is used to limit the relative rotation angle between the second outer frame 611 and the housing 1, further preventing excessive rotation from a physical structure perspective. A fourth limiting structure is provided between the second outer frame 611 and the second inner frame 621. The fourth limiting structure is used to limit the relative rotation angle between the second inner frame 621 and the second outer frame 611, further preventing excessive rotation from a physical structure perspective.

[0047] Specifically, in this embodiment, the second inner frame 621 includes a detachably mated frame body 6211 and a mirror pressing plate 6212. The reflector 34 is placed in the frame body 6211. The mirror pressing plate 6212 is mounted on the frame body 6211 to press the reflector 34, thereby firmly mounting the reflector 34 in the frame body 6211. This arrangement provides a simple structure and facilitates assembly and disassembly.

[0048] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that variations and improvements are possible without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A projector with an image correction function, characterized in that: include: A housing, a projection lens, and an imaging module, a light source module, a first adjustment component, and a second adjustment component disposed in the housing; The projection lens is disposed on a side surface of the housing. The imaging module includes a rear Fresnel lens, an LCD screen, a front Fresnel lens, and a reflector. The light source provided by the light source module passes through the rear Fresnel lens, the LCD screen, the front Fresnel lens, and the reflector in sequence, and is then emitted from the projection lens to the outside of the housing. The front Fresnel lens is mounted on a first adjustment assembly so as to be flippable relative to the housing. The first adjustment assembly includes a first horizontal adjustment mechanism and a first vertical adjustment mechanism. The first horizontal adjustment mechanism is used to adjust the flip angle of the front Fresnel lens around the horizontal direction, and the first vertical adjustment mechanism is used to adjust the flip angle of the front Fresnel lens around the vertical direction. The reflector is mounted on a second adjustment assembly so as to be flippable relative to the housing. The second adjustment assembly includes a second horizontal adjustment mechanism and a second vertical adjustment mechanism. The second horizontal adjustment mechanism is used to adjust the flip angle of the reflector around the horizontal direction, and the second vertical adjustment mechanism is used to adjust the flip angle of the reflector around the vertical direction. A control mainboard is provided on the shell, and a six-axis gyroscope is mounted on the control mainboard.

2. The projector with image correction function according to claim 1, characterized in that: The first horizontal adjustment mechanism includes a first outer frame and a first motor. A first horizontal rotating shaft is provided on both sides of the first outer frame. The first outer frame is rotatably connected to the shell in the horizontal direction through the first horizontal rotating shaft. The first motor is fixed inside the shell. The output shaft of the first motor is driven and connected to the first outer frame through a first transmission structure. The first vertical adjustment mechanism is arranged in the first outer frame, and the front Fresnel lens is fixed on the first vertical adjustment mechanism.

3. The projector with image correction function according to claim 2, characterized in that: The first vertical adjustment mechanism includes a first inner frame and a second motor. A first vertical rotating shaft is provided at the upper and lower ends of the first inner frame. The first inner frame is rotatably connected to the first outer frame through the first vertical rotating shaft. The second motor is fixed on the first outer frame. The output shaft of the second motor is drivingly connected to the first inner frame through a second transmission structure. The front Fresnel lens is fixed in the first inner frame.

4. The projector with image correction function according to claim 1, characterized in that: The second horizontal adjustment mechanism includes a second outer frame and a third motor. A second horizontal rotating shaft is provided on both sides of the second outer frame. The second outer frame is rotatably connected to the shell in the horizontal direction through the second horizontal rotating shaft. The third motor is fixed inside the shell. The output shaft of the third motor is driven and connected to the second outer frame through a third transmission structure. The second vertical adjustment mechanism is arranged in the second outer frame, and the reflector is fixed on the second vertical adjustment mechanism.

5. The projector with image correction function according to claim 4, characterized in that: The second vertical adjustment mechanism includes a second inner frame and a fourth motor. Second vertical rotating shafts are provided at the upper and lower ends of the second inner frame. The second inner frame is rotatably connected to the second outer frame through the second vertical rotating shaft. The fourth motor is fixed on the second outer frame. The output shaft of the fourth motor is drivingly connected to the second inner frame through a fourth transmission structure. The reflector is fixed in the second inner frame.

6. The projector with image correction function according to claim 5, characterized in that: The second horizontal adjustment mechanism includes a second horizontal sensor for detecting a rotation angle of the second outer frame, and the second vertical adjustment mechanism includes a second vertical sensor for detecting a rotation angle of the second inner frame.

7. The projector with image correction function according to claim 3, characterized in that: The second transmission structure includes an eccentric wheel arranged on the output shaft of the second motor and a connecting rod arranged on one side of the first inner frame. A sliding groove is provided in the connecting rod, and the eccentric shaft on the eccentric wheel is inserted into the sliding groove. The second motor drives the eccentric wheel to rotate to drive the connecting rod to make the first inner frame rotate around the first vertical rotation axis.

8. The projector with image correction function according to claim 3, characterized in that: A first limiting structure is provided between the first outer frame and the shell, and a second limiting structure is provided between the first outer frame and the first inner frame.

9. The projector with image correction function according to claim 5, characterized in that: A third limiting structure is provided between the second outer frame and the shell, and a fourth limiting structure is provided between the second outer frame and the second inner frame.

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