A LCD projector lens shift device

Abstract

The application discloses a kind of LCD projector lens shift device, including LCD light valve, bottom shell, cover plate, projection lens, vertical displacement component, horizontal displacement component and operating component;The LCD light valve, bottom shell and cover plate are sequentially arranged according to the direction of light travel;The LCD light valve is located on the incident side of the bottom shell and is assembled into an integral whole with the bottom shell;The optical axis of the projection lens and the plane where the display window of the LCD light valve is located are orthogonal;The middle of the cover plate and the bottom shell is hollow structure and is used to pass through the projection lens.The application realizes the mechanical shift of the projection lens, and does not produce loss and influence on the definition of image as electronic trapezoidal correction method, and the application has low manufacturing cost, high cost performance, and is especially suitable for large quantity and wide range, cost-sensitive projector products, and is suitable for single LCD, 2LCD and 3LCD projection technology.

Description

Technical Field

[0001] This invention relates to the field of projector technology, and more particularly to a lens shifting device for an LCD projector. Background Technology

[0002] Traditionally, lens shift mechanisms have only been found in high-priced 3LCD / DLP projectors. Different products may have different specific shift structures and implementation methods. However, the basic technical requirements for the shift function, such as extremely high precision, excellent handling, and quality assurance and reliability in all weather conditions, are common.

[0003] Between 2010 and 2012, one or two domestically produced projectors developed tilt-shift functionality, but due to their high prices, they only appeared briefly on the market before disappearing. Because of the extremely high manufacturing requirements, almost no domestically produced projectors in reality possess lens tilt-shift functionality.

[0004] Lens shift mechanisms are not simply engineering technologies that enable lens movement; they incorporate the engineering foundations of many disciplines, including precision manufacturing, optical design, materials science, and mechanics. Therefore, a projector equipped with a qualified shift mechanism often means higher costs and consequently higher product prices. For example, the high-end entry-level projector PLV-Z700 released by Sanyo more than a decade ago had over a dozen transmission gears and multiple return springs with different elastic parameters in its shift mechanism, resembling a miniature mechanical clock. Some projectors, to ensure that the lens doesn't exceed its field of view during horizontal and vertical shifting, thus preventing unpleasant user experiences (such as vignetting), employ various purely mechanical limiting structures and clutch structures in their transmission systems, achieving a complexity comparable to, or even surpassing, that of a car's transmission system. Furthermore, some projectors incorporate power steering systems in their shift mechanisms, similar to a car's power steering system, where manual adjustment merely follows electronic signals from an electronically controlled servo system; the actual work is not done by human intervention.

[0005] Currently, for ordinary projectors, to address user convenience issues such as projector installation and placement, people often use electronic software to achieve a shortcut of "electronic keystone correction" when projecting at an angle, thanks to the powerful memory of the LCD light valve driver chip. However, this approach results in a significant loss of image sharpness. Furthermore, most projection lenses lack sufficient depth of field for projection angles of ≥12°, making the electronic method less practical than commonly perceived. Only through mechanical tilt-shifting of the lens can image sharpness be maintained without loss or impact.

[0006] Clearly, existing tilt-shift structures and technologies, whether for projectors or high-end cameras, are difficult to replicate and apply to domestically produced consumer digital projection products due to cost considerations. Therefore, designing and manufacturing cost-effective tilt-shift lens structures for these widely used and cost-sensitive projectors has become an urgent issue for those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an LCD projector lens shifting device. This invention realizes mechanical shifting of the projection lens without causing loss or impact on image clarity. Moreover, this invention has low manufacturing cost and high cost performance, and is particularly suitable for projector products with large production volume and wide application where cost is sensitive.

[0008] To achieve the above objectives, the present invention provides an LCD projector lens tilt-shifting device, comprising an LCD light valve, a bottom shell, a cover plate, a projection lens, a vertical displacement component, a horizontal displacement component, and an operating component; the LCD light valve, the bottom shell, and the cover plate are arranged sequentially according to the direction of light travel; the LCD light valve is located on the incident side of the bottom shell and is assembled integrally with the bottom shell; the optical axis of the projection lens and the plane containing the display window of the LCD light valve are orthogonal; the cover plate is located on the exit side of the bottom shell and covers the bottom shell; a cavity is formed between the bottom shell and the cover plate, and the cover plate is provided with a vertical track and a horizontal window; the middle part of the cover plate and the bottom shell has a hollow structure for the projection lens to pass through.

[0009] The bottom shell has multiple first reference surfaces on the bottom surface of the emission side. The first reference surfaces are orthogonal to the optical axis of the projection lens and are higher than the bottom surface of the emission side of the bottom shell. A vertical waist-shaped guide rail is provided in the first reference surface.

[0010] The vertical displacement assembly includes a first fixed box, a worm gear, a vertical slider, and a crossbeam; the first fixed box is mounted on the surface of the exit side of the cover plate, and the first fixed box is provided with an oblong track opposite to the position of the vertical track.

[0011] The vertical slider has a second reference surface and a plurality of first protrusions on its incident surface. The number of first protrusions is the same as that of the vertical waist-shaped guide rail and their positions are opposite.

[0012] The vertical slider is located inside the cavity, and the plurality of first protrusions are respectively inserted into the plurality of vertical waist-shaped guide rails, and the first protrusions can slide up and down inside the vertical waist-shaped guide rails; the second reference surface and the first reference surface are adjacent to each other; the space between the second reference surface and the first reference surface is filled with lubricating oil or grease.

[0013] The vertical slider has a third reference surface, a force-receiving hole, and multiple horizontal waist-shaped guide rails on its exit surface; the third reference surface is parallel to the second reference surface; the crossarm has a threaded hole, one end of the crossarm is inserted into the waist-shaped guide rail, and the other end passes through the vertical guide rail and is inserted into the force-receiving hole; the worm has a threaded section, one end of the worm is inserted into the first fixed box, and the threaded section is threaded into the threaded hole; when the worm rotates relative to the first fixed box, the crossarm moves up and down, thereby driving the vertical slider to slide up and down in the vertical direction.

[0014] The horizontal displacement assembly includes a second fixed box, a rotating shaft, a horizontal slider, a transverse plate, and a gear; the second fixed box is mounted on the surface of the exit side of the cover plate; the second fixed box has a notch for avoiding the transverse plate; the incident surface of the horizontal slider has a fourth reference surface and a plurality of second protrusions; the number of second protrusions is the same as that of the horizontal waist-shaped guide rail and their positions are opposite.

[0015] The horizontal slider is located inside the cavity and between the cover plate and the vertical slider; a plurality of second protrusions are respectively inserted into a plurality of horizontal waist-shaped guide rails, and the second protrusions can slide left and right within the horizontal waist-shaped guide rails; the fourth reference surface and the third reference surface are adjacent to each other; the space between the third reference surface and the fourth reference surface is filled with lubricating oil or grease.

[0016] The horizontal slider has a vertical waist-shaped track on its exit surface; the transverse plate has a rack on its side and a third protrusion on its opposite side; the gear is located inside the second fixed box, one end of the rotating shaft passes through the second fixed box and the gear is mounted on the rotating shaft; the rack and the gear mesh, and the third protrusion passes through the horizontal window and is inserted into the vertical waist-shaped track, and the third protrusion can slide up and down in the vertical waist-shaped track; when the rotating shaft rotates relative to the second fixed box, the gear and the rotating shaft rotate synchronously, driving the rack, the transverse plate and the third protrusion to slide in the horizontal direction, thereby driving the horizontal slider to slide in the horizontal direction.

[0017] The projection lens and the horizontal slider are assembled as one unit; the operating components include a vertical manual turntable mounted on the other end of the worm gear and a horizontal manual turntable mounted on the other end of the rotating shaft.

[0018] Furthermore, a fifth reference surface is provided on the exit surface of the horizontal slider; the fifth reference surface is parallel to the fourth reference surface; the LCD projector lens shifting device also includes a shock absorption component, which includes a spring plate, a shim rivet, and a pressure block. Both ends of the pressure block are provided with connecting shafts, and the middle part of the spring plate is fixedly connected to the surface of the exit side of the cover plate through the shim rivet.

[0019] The spring plate has a first positioning hole at both ends, and the cover plate has two second positioning holes opposite to the two first positioning holes. The pressure block is provided between the two ends of the spring plate and the cover plate. The connecting shaft of one end of the pressure block passes through the first positioning hole, and the connecting shaft of the other end passes through the second positioning hole and abuts against the fifth reference surface of the horizontal slider. The thickness of the shim rivet is less than the thickness of the pressure block. There are two shock absorption components, which are distributed on both sides of the cover plate.

[0020] Preferably, the end face of the connecting shaft at the other end of the pressure block and the fifth reference surface are coated with lubricating oil or grease.

[0021] Furthermore, the vertical displacement assembly also includes a first open retaining ring; the worm gear is provided with a first recess, a first cylindrical section, a threaded section, a first cylindrical section, a first limiting cylindrical section, and a first male key section in sequence from one end to the other, the diameter of the first limiting cylindrical section is larger than the diameter of the first cylindrical section, the first fixing box is provided with a first cylindrical hole that mates with the first cylindrical section, and the worm gear is rotatably mounted on the first fixing box through the first cylindrical section and the first cylindrical hole; the first open retaining ring is inserted into the first recess; the vertical manual turntable is provided with a first female key that matches the first male key section, and the vertical manual turntable is mounted on the first male key section through the first female key.

[0022] Furthermore, the horizontal moving assembly also includes a second open retaining ring; the rotating shaft is provided with a second concave platform, a second cylindrical section, a flat key section, a second cylindrical section, a second limiting cylindrical section, and a second male key section in sequence from one end to the other; the diameter of the second limiting cylindrical section is larger than the diameter of the second cylindrical section; the gear is provided with a keyway hole that mates with the flat key section, and the rotating shaft is installed in the gear through the flat key section.

[0023] The second fixed box is provided with a second cylindrical hole that mates with the second cylindrical section; the rotating shaft is rotatably mounted on the second fixed box through the second cylindrical section and the second cylindrical hole; the second opening retaining ring is inserted into the second recess; the horizontal manual turntable is provided with a second female key that matches the second male key section, and the horizontal manual turntable is mounted on the second male key section through the second female key.

[0024] Preferably, the first common key is in the form of a flat key, a semi-circular key, or a spline.

[0025] Preferably, the second common key is in the form of a flat key, a semi-circular key, or a spline.

[0026] The beneficial effects of this invention are:

[0027] This invention achieves vertical sliding of the projection lens through a vertical displacement component and horizontal sliding of the projection lens through a horizontal displacement component, thereby realizing mechanical tilt-shifting motion of the projection lens in both the horizontal and vertical directions. Therefore, it does not cause loss or impact on image clarity as with electronic keystone correction. Moreover, the lens tilt-shifting device of this invention has low manufacturing cost and high cost-effectiveness, making it particularly suitable for projector products with large production volumes and high cost sensitivity. It is also applicable to single LCD, 2LCD, and 3LCD projection technologies. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a perspective view of the present invention;

[0030] Figure 2 This is an exploded view of the present invention;

[0031] Figure 3 This is an exploded view of the invention from another angle;

[0032] Figure 4 This is a perspective view of the bottom shell of the present invention;

[0033] Figure 5 for Figure 4 Enlarged view of point A;

[0034] Figure 6 This is an exploded view of the bottom shell and cover plate of the present invention;

[0035] Figure 7 This is an exploded view of the cover plate, the first fixing box, the second fixing box, and the shock absorption assembly of the present invention;

[0036] Figure 8 This is a plan view of the cover plate, the first fixing box, and the second fixing box of the present invention;

[0037] Figure 9This is an exploded view of the bottom shell and vertical slider of the present invention;

[0038] Figure 10 This is an exploded view of the bottom shell and vertical displacement assembly of the present invention;

[0039] Figure 11 This is an exploded view of the vertical slider, horizontal displacement component, and projection lens of the present invention.

[0040] Figure 12 This is an exploded view of the horizontal displacement component, the shock absorption component, and the vertical slider of the present invention;

[0041] Figure 13 This is an exploded view of the bottom shell, vertical slider, horizontal slider, cover plate, and shock absorption assembly of the present invention;

[0042] Figure 14 This is a schematic diagram of an existing lens tilt-shift device. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention 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 the invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] See Figure 14 As shown, this is a structure exhibited by one of the earlier representative models with vertical lens shift functionality (the technology shown in the figure is from an LCD projection product of 3M Corporation in the United States). It can be said to have a relatively simple structure, but at the same time, it also means that it requires extremely high manufacturing precision.

[0049] Figure 14 The lens shifting device includes key materials such as three LCD light valves 11', 12', and 13', an L-shaped color-combining prism 14', a base 2', a projection lens 4', a vertical displacement slider 5', and a central track 15'. The three LCD light valves 11', 12', and 13', the L-shaped color-combining prism 14', and the base 2' are fixed together as a single unit.

[0050] The base 2' has 45° inward-pointing rails 28' at both ends in the horizontal direction (i.e., parallel to the ground plane, the same below). The projection lens 4' is fixed on the vertical displacement slider 5'. The vertical displacement slider 5' has 45° outward-pointing guide structures 51' at both ends in the horizontal direction, and an intermediate rail 15' is provided between the guide structures 51' and the rails 28'.

[0051] Both the base 2' and the vertical displacement slider 5' are precision machined directly from aluminum alloy. The intermediate track 15' is also precision machined, but made of brass. This is done to ensure the lens's vertical (i.e., perpendicular to the ground plane or the direction shown on the paper) sliding effectively during long-term operation of the projector worldwide. In this product, the base 2''s track 28', the vertical displacement slider 5', and the intermediate track 15' can slide relative to each other; even if one set gets stuck (or jammed), it will still function normally.

[0052] At the end of the last century, the level of material manufacturing was incomparable to today's. The extremely high precision requirements of that period would still fall into the category of "ultra-precision" machining even today. Actual measurements showed that the gaps between track 28', guide structure 51', and intermediate track 15' were all controlled between approximately 0.01mm and 0.012mm. Furthermore, no lubricating interface material was used (potentially due to the poor durability of the melted material) to reduce sliding resistance. The requirements for cutting tools and machine tools were almost entirely devoid of the possibility of cost-effectiveness. These minimalist benchmark designs are also the driving force behind the industry's need for extensive technological innovation and surpassing of them.

[0053] Example:

[0054] See Figures 1-13 As shown, this embodiment provides an LCD projector lens tilt-shifting device, including an LCD light valve 1, a bottom shell 2, a cover plate 3, a projection lens 4, a vertical displacement component, a horizontal displacement component, and an operating component; the LCD light valve 1, the bottom shell 2, and the cover plate 3 are arranged sequentially according to the light travel direction; the LCD light valve 1 is located on the incident side of the bottom shell 2 and is assembled integrally with the bottom shell 2; the optical axis of the projection lens 4 is orthogonal to the plane where the display window of the LCD light valve 1 is located; the cover plate 3 is located on the exit side of the bottom shell 2 and covers the bottom shell 2; a cavity is formed between the bottom shell 2 and the cover plate 3, and the cover plate 3 is provided with a vertical track 32 and a horizontal window 33; the middle part of the cover plate 3 and the bottom shell 2 has a hollow structure and is used for the projection lens 4 to pass through. The hollow part 24 in the middle of the bottom shell 2 is used for light to pass through or for other structural components to avoid.

[0055] The LCD light valve 1 and the base shell 2 are both fixed inside the projector (not shown in the figure) and are in a relatively stationary relationship. That is to say, when the optical axis of the projection lens 4 moves (actually, the projection lens 4 moves relative to the LCD light valve 1 or the base shell 2), the LCD light valve 1 and the base shell 2 remain relatively stationary.

[0056] On the end face where the bottom shell 2 and the cover plate 3 fit together, there are multiple positioning posts 23 and multiple first screw holes 22. Correspondingly, the cover plate 3 has multiple positioning holes and second screw holes for one-to-one fixing, that is, the cover plate 3 and the bottom shell 2 are precisely fitted together. In this embodiment, ten screws (but not limited to screws 91-100) are used for fitting and fixing.

[0057] The bottom shell 2 has multiple first reference surfaces 21 on the bottom surface of the emission side. The first reference surfaces 21 are orthogonal to the optical axis of the projection lens 4. The first reference surfaces 21 are higher than the bottom surface of the emission side of the bottom shell 2. A vertical waist-shaped guide rail 25 is provided in the first reference surface 21.

[0058] In this embodiment, the first reference plane 21 has four locations (but is not limited to, the same below).

[0059] In this embodiment, the first reference surface 21 is preferably 0.3-0.5mm higher than the bottom surface of the ejection side of the bottom shell 2 (but not limited to).

[0060] The vertical displacement assembly includes a first fixing box 51, a worm gear 52, a vertical slider 54, and a crossbeam 55; the first fixing box 51 is installed on the surface of the exit side of the cover plate 3, and the first fixing box 51 is provided with an oblong track 511 opposite to the position of the vertical track 32.

[0061] The vertical slider 54 has a second reference surface 541 and a plurality of first protrusions 542 on its incident surface. The number of first protrusions 542 is the same as that of the vertical waist-shaped guide rail 25 and their positions are opposite.

[0062] The vertical slider 54 is located within the cavity, and multiple first protrusions 542 are respectively inserted into multiple vertical waist-shaped guide rails 25, with the first protrusions 542 capable of sliding up and down within the vertical waist-shaped guide rails 25; the second reference surface 541 and the first reference surface 21 are abutted. Preferably, the space between the second reference surface 541 and the first reference surface 21 is filled with lubricating oil or grease, thereby reducing the resistance when the vertical slider 54 slides up and down relative to the bottom shell 2.

[0063] The vertical slider 54 has a third reference surface 544, a force-receiving hole 545, and multiple horizontal waist-shaped guide rails 543 on its exit surface; the third reference surface 544 is parallel to the second reference surface 541; the crossarm 55 has a threaded hole, one end of the crossarm 55 is inserted into the waist-shaped guide rail 511, and the other end passes through the vertical rail 32 and is inserted into the force-receiving hole 545; the worm 52 has a threaded section, one end of the worm 52 is inserted into the first fixed box 51, and the threaded section is threaded with the threaded hole; when the worm 52 rotates relative to the first fixed box 51, the crossarm 55 moves up and down, thereby driving the vertical slider 54 to slide up and down in the vertical direction.

[0064] The horizontal displacement assembly includes a second fixed box 61, a rotating shaft 62, a horizontal slider 64, a transverse plate 65, and a gear 66. The second fixed box 61 is mounted on the surface of the exit side of the cover plate 3. The second fixed box has a notch for avoiding the transverse plate 65. The incident surface of the horizontal slider 64 has a fourth reference surface 641 and a plurality of second protrusions 642. The number of second protrusions 642 is the same as the number of horizontal waist-shaped guide rails 543, and their positions are opposite.

[0065] The horizontal slider 64 is located within the cavity and between the cover plate 3 and the vertical slider 54; a plurality of second protrusions 642 are respectively inserted into a plurality of horizontal waist-shaped guide rails 543, and the second protrusions 642 can slide left and right (also referring to the horizontal direction) within the horizontal waist-shaped guide rails 543; the fourth reference surface 641 and the third reference surface 544 are adjacent to each other. Preferably, the space between the third reference surface 544 and the fourth reference surface 641 is filled with lubricating oil or grease, thereby reducing the resistance when the horizontal slider 64 slides horizontally relative to the vertical slider 54.

[0066] The horizontal slider 64 has a vertical waist-shaped track 643 on its exit surface; the transverse plate 65 has a rack 652 on its side and a third protrusion 651 on its opposite side; the gear 66 is located inside the second fixed box 61, one end of the rotating shaft 62 passes into the second fixed box 61 and the gear 66 is mounted on the rotating shaft 62; the rack 652 and the gear 66 mesh with each other, and the third protrusion 651 passes through the horizontal window 33 and is inserted into the vertical waist-shaped track 643, and the third protrusion 651 can slide up and down in the vertical waist-shaped track 643; when the rotating shaft 62 rotates relative to the second fixed box 61, the gear 66 and the rotating shaft 62 rotate synchronously, driving the rack 652, the transverse plate 65 and the third protrusion 651 to slide in the horizontal direction, thereby driving the horizontal slider 64 to slide in the horizontal direction.

[0067] The projection lens 4 and the horizontal slider 64 are assembled as one unit.

[0068] The operating components include a vertical manual turntable 71 mounted on the other end of the worm gear 52 and a horizontal manual turntable 72 mounted on the other end of the shaft 62.

[0069] In this embodiment, when the vertical displacement assembly is in operation, the operator turns the vertical manual turntable 71, which drives the worm gear 52 to rotate on the first fixed box 51. Under the action of the threaded section and the threaded hole, the rotation of the worm gear 52 will drive the crossarm 55 to move up and down, so that the crossarm 55 slides up and down within the vertical track 32 and the waist-shaped track 511. Since the other end of the crossarm 55 is inserted into the force-receiving hole 545, when the crossarm 55 moves up and down, it will drive the vertical slider 54 to slide up and down vertically within the cavity formed by the bottom shell 2 and the cover plate 3. At the same time, under the action of the first boss 542 and the vertical waist-shaped guide rail 25, the vertical slider 54 is guided to move up and down, ensuring the accuracy of the vertical movement of the vertical slider 54. Furthermore, under the action of the second boss 642 and the horizontal waist-shaped guide rail 543, when the vertical slider 54 moves up and down, the horizontal slider 64 moves up and down synchronously with the vertical slider 54. While the horizontal slider 64 moves up and down, the third boss 651 slides up and down within the vertical waist-shaped guide rail 643. Therefore, when the horizontal slider 64 moves up and down synchronously with the vertical slider 54, the horizontal slider 64 does not interfere with the movement of the vertical slider 54. Since the projection lens 4 is assembled integrally with the horizontal slider, when the horizontal slider 64 moves up and down synchronously with the vertical slider 54, the projection lens 4 achieves a mechanical axis-shifting motion in the vertical direction.

[0070] In this embodiment, when the horizontal displacement component is working, the operator turns the horizontal manual turntable 72, thereby driving the rotating shaft 62 to rotate on the second fixed box 61. The rotation of the rotating shaft 62 synchronously drives the gear 66 to rotate, and the rotation of the gear 66 drives the rack 652, the transverse plate 65, and the third boss 651 to slide in the horizontal direction, wherein the third boss 651 slides horizontally within the horizontal window 33. Under the action of the third boss 651 and the vertical waist-shaped rail 643, the horizontal slider 64 is driven to slide horizontally during the horizontal sliding of the third boss 651. Under the action of the second boss 642 and the horizontal waist-shaped guide rail 5430, the guiding function of the horizontal slider 64 during horizontal sliding is realized, ensuring the accuracy of the horizontal sliding of the horizontal slider 64. During the horizontal sliding of the horizontal slider 64, the vertical slider 54 does not follow the movement, that is, the vertical slider 54 does not move. The projection lens 4 is assembled with the horizontal slider 64 as one unit, so when the horizontal slider 64 slides horizontally, the projection lens 4 realizes a mechanical axis shifting movement in the horizontal direction.

[0071] In this embodiment, the vertical displacement component enables the projection lens 4 to slide vertically, and the horizontal displacement component enables the projection lens 4 to slide horizontally, thereby achieving mechanical tilt-shifting motion of the projection lens 4 in both the horizontal and vertical directions. Therefore, it does not cause any loss or impact on the image clarity.

[0072] Moreover, the lens shift device in this embodiment has low manufacturing cost and high cost performance, making it particularly suitable for projector products with large production volume and wide application where cost is a major concern. It is also applicable to single LCD, 2LCD and 3LCD projection technologies.

[0073] In this embodiment, due to the presence of the first reference surface 21, the manufacturing requirements for the bottom shell 2 are greatly reduced. Therefore, the material of the bottom shell 2 can be made of materials such as plastic injection molding, which is much cheaper than the aluminum alloy die casting used in some imported projector products, and does not require secondary CNC machining.

[0074] In this embodiment, the vertical displacement assembly further includes a first open retaining ring 53; the worm gear 52 is provided with a first recess, a first cylindrical section, a threaded section, a first cylindrical section, a first limiting cylindrical section, and a first male key section in sequence from one end to the other. The diameter of the first limiting cylindrical section is larger than the diameter of the first cylindrical section. The first fixing box 51 is provided with a first cylindrical hole that mates with the first cylindrical section. The worm gear 52 is rotatably mounted on the first fixing box 51 through the first cylindrical section and the first cylindrical hole. The first open retaining ring 53 is inserted into the first recess. The vertical manual turntable 71 is provided with a first female key that matches the first male key section. The vertical manual turntable 71 is mounted on the first male key section through the first female key.

[0075] The axial installation limit function of the worm gear 52 relative to the first fixed box 51 is achieved by the first open retaining ring 53 and the first limiting cylindrical section.

[0076] In this embodiment, the first public key is a flat key, a semi-circular key, or a spline.

[0077] In this embodiment, the horizontal moving component further includes a second open retaining ring 63; the rotating shaft 62 is provided with a second recess, a second cylindrical section, a flat key section, a second cylindrical section, a second limiting cylindrical section, and a second male key section sequentially from one end to the other; the diameter of the second limiting cylindrical section is larger than the diameter of the cylindrical shaft; the gear 66 is provided with a keyway hole that mates with the flat key section, and the rotating shaft 62 is installed in the gear 66 through the flat key section; the second fixing box 61 is provided with a second cylindrical hole that mates with the second cylindrical section; the rotating shaft 62 is rotatably installed on the second fixing box 61 through the second cylindrical section and the second cylindrical hole; the second open retaining ring 63 is inserted into the second recess; the horizontal manual turntable 72 is provided with a second female key that matches the second male key section, and the horizontal manual turntable 72 is installed on the second male key section through the second female key sleeve.

[0078] The axial installation limiting function of the rotating shaft 62 relative to the second fixed box 61 is achieved by the second open retaining ring 63 and the second limiting cylindrical section.

[0079] In this embodiment, the second public key is a flat key, a semi-circular key, or a spline.

[0080] In a further preferred embodiment, the horizontal slider 64 has a fifth reference surface 644 on its exit surface; the fifth reference surface 644 and the fourth reference surface 641 are parallel. The LCD projector lens tilt-shifting device also includes a shock-absorbing component, which includes a spring plate 81, a shim rivet 31, and a pressure block 83. Both ends of the pressure block 83 are provided with connecting shafts, and the middle part of the spring plate 81 is fixedly connected to the surface of the exit side of the cover plate 3 through the shim rivet 31.

[0081] Both ends of the spring plate 81 are provided with first positioning holes, and the cover plate 3 is provided with two second positioning holes opposite to the two first positioning holes. A pressure block 83 is provided between both ends of the spring plate 81 and the cover plate 3. A connecting shaft at one end of the pressure block 83 passes through the first positioning hole, and a connecting shaft at the other end passes through the second positioning hole and abuts against the fifth reference surface 644 of the horizontal slider 64. The thickness of the shim rivet 31 is less than the thickness of the pressure block 83. Preferably, lubricating oil or grease is applied between the end face of the connecting shaft at the other end of the pressure block 83 and the fifth reference surface 644.

[0082] Preferably, there are two shock-absorbing components, which are distributed on both sides of the cover plate 3.

[0083] This embodiment uses a damping component to achieve the damping function of the vertical and horizontal displacement components during operation, ensuring the movement accuracy of the vertical and horizontal displacement components and achieving precise axis shifting.

[0084] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A tilt-shifting device for an LCD projector lens, characterized in that, The system includes an LCD light valve (1), a bottom shell (2), a cover plate (3), a projection lens (4), a vertical displacement assembly, a horizontal displacement assembly, and an operating assembly. The LCD light valve (1), the bottom shell (2), and the cover plate (3) are arranged sequentially according to the direction of light travel. The LCD light valve (1) is located on the incident side of the bottom shell (2) and is assembled with the bottom shell (2) as a whole. The optical axis of the projection lens (4) and the plane where the display window of the LCD light valve (1) is located are orthogonal. The cover plate (3) is located on the exit side of the bottom shell (2) and covers the bottom shell (2). A cavity is formed between the bottom shell (2) and the cover plate (3). The cover plate (3) is provided with a vertical track (32) and a horizontal window (33). The middle part of the cover plate (3) and the bottom shell (2) has a hollow structure and is used to allow the projection lens (4) to pass through. The bottom shell (2) has multiple first reference surfaces (21) on the bottom surface of the emission side. The first reference surfaces (21) are orthogonal to the optical axis of the projection lens (4). The first reference surfaces (21) are higher than the bottom surface of the emission side of the bottom shell (2). A vertical waist-shaped guide rail (25) is provided in the first reference surface (21). The vertical displacement assembly includes a first fixed box (51), a worm gear (52), a vertical slider (54), and a crossbeam (55); the first fixed box (51) is installed on the surface of the exit side of the cover plate (3), and the first fixed box (51) is provided with a waist-shaped track (511) opposite to the position of the vertical track (32). The vertical slider (54) has a second reference surface (541) and a plurality of first protrusions (542) on its incident surface. The number of first protrusions (542) is the same as that of the vertical waist-shaped guide rail (25) and their positions are opposite. The vertical slider (54) is located in the cavity, and a plurality of first protrusions (542) are respectively inserted into a plurality of vertical waist-shaped guide rails (25), and the first protrusions (542) can slide up and down in the vertical waist-shaped guide rails (25); the second reference surface (541) and the first reference surface (21) are adjacent to each other; the space between the second reference surface (541) and the first reference surface (21) is filled with lubricating oil or grease; The vertical slider (54) has a third reference surface (544), a force-receiving hole (545), and multiple horizontal waist-shaped guide rails (543) on its exit surface; the third reference surface (544) is parallel to the second reference surface (541); the crossarm (55) has a threaded hole, one end of the crossarm (55) is inserted into the waist-shaped guide rail (511), and the other end passes through the vertical guide rail (32) and is inserted into the force-receiving hole (545); the worm (52) has a threaded section, one end of the worm (52) is inserted into the first fixed box (51), and the threaded section is threaded with the threaded hole; when the worm (52) rotates relative to the first fixed box (51), the crossarm (55) moves up and down, thereby driving the vertical slider (54) to slide up and down in the vertical direction; The horizontal displacement assembly includes a second fixed box (61), a rotating shaft (62), a horizontal slider (64), a transverse plate (65), and a gear (66). The second fixing box (61) is installed on the surface of the exit side of the cover plate (3); the second fixing box is provided with a notch for avoiding the transverse plate (65); The incident surface of the horizontal slider (64) is provided with a fourth reference surface (641) and a plurality of second protrusions (642); the number of the second protrusions (642) is the same as that of the horizontal waist-shaped guide rail (543) and their positions are opposite. The horizontal slider (64) is located inside the cavity and between the cover plate (3) and the vertical slider (54); a plurality of second bosses (642) are respectively inserted into a plurality of horizontal waist-shaped guide rails (543), and the second bosses (642) can slide left and right within the horizontal waist-shaped guide rails (543); the fourth reference surface (641) and the third reference surface (544) are adjacent to each other; the space between the third reference surface (544) and the fourth reference surface (641) is filled with lubricating oil or grease; The horizontal slider (64) has a vertical waist-shaped track (643) on its exit surface; the transverse plate (65) has a rack (652) on its side and a third boss (651) on its opposite side; the gear (66) is located inside the second fixed box (61), one end of the rotating shaft (62) passes into the second fixed box (61) and the gear (66) is mounted on the rotating shaft (62); the rack (652) and the gear (66) mesh, and the third boss (651) 1) After passing through the horizontal window (33), it is inserted into the vertical waist-shaped track (643). The third boss (651) can slide up and down in the vertical waist-shaped track (643). When the rotating shaft (62) rotates relative to the second fixed box (61), the gear (66) and the rotating shaft (62) rotate synchronously, driving the rack (652), the transverse plate (65) and the third boss (651) to slide in the horizontal direction, thereby driving the horizontal slider (64) to slide in the horizontal direction. The projection lens (4) and the horizontal slider (64) are assembled as one unit; The operating components include a vertical manual turntable (71) mounted on the other end of the worm (52) and a horizontal manual turntable (72) mounted on the other end of the shaft (62).

2. The LCD projector lens shifting device according to claim 1, characterized in that, The horizontal slider (64) has a fifth reference surface (644) on its exit surface; the fifth reference surface (644) and the fourth reference surface (641) are parallel to each other; The LCD projector lens shifting device also includes a shock absorption component, which includes a spring plate (81), a shim rivet (31), and a pressure block (83). Both ends of the pressure block (83) are provided with connecting shafts. The middle part of the spring plate (81) is fixedly connected to the surface of the exit side of the cover plate (3) through the shim rivet (31). The spring plate (81) has a first positioning hole at both ends, and the cover plate (3) has two second positioning holes that are opposite to the two first positioning holes. The pressure block (83) is provided between the two ends of the spring plate (81) and the cover plate (3). The connecting shaft of one end of the pressure block (83) passes through the first positioning hole, and the connecting shaft of the other end passes through the second positioning hole and presses against the fifth reference surface (644) of the horizontal slider (64). The thickness of the shim rivet (31) is less than the thickness of the pressure block (83). The number of shock-absorbing components is two, and the two shock-absorbing components are distributed on both sides of the cover plate (3).

3. The LCD projector lens shifting device according to claim 2, characterized in that, Lubricating oil or grease is applied between the end face of the connecting shaft at the other end of the pressure block (83) and the fifth reference surface (644).

4. The LCD projector lens shifting device according to claim 1, characterized in that, The vertical displacement assembly further includes a first open retaining ring (53); the worm (52) is provided with a first recess, a first cylindrical section, a threaded section, a first cylindrical section, a first limiting cylindrical section and a first male key section in sequence from one end to the other. The diameter of the first limiting cylindrical section is larger than the diameter of the first cylindrical section. The first fixing box (51) is provided with a first cylindrical hole that mates with the first cylindrical section. The worm (52) is rotatably mounted on the first fixing box (51) through the first cylindrical section and the first cylindrical hole. The first open retaining ring (53) is inserted into the first recess. The vertical manual turntable (71) is provided with a first female key that matches the first male key segment, and the vertical manual turntable (71) is installed on the first male key segment through the first female key.

5. The LCD projector lens shifting device according to claim 1, characterized in that, The horizontal moving assembly also includes a second open retaining ring (63); the rotating shaft (62) is provided with a second concave platform, a second cylindrical section, a flat key section, a second cylindrical section, a second limiting cylindrical section, and a second male key section in sequence from one end to the other; the diameter of the second limiting cylindrical section is greater than the diameter of the second cylindrical section; The gear (66) is provided with a keyway hole that mates with the flat key section, and the rotating shaft (62) is installed in the gear (66) through the flat key section; The second fixed box (61) is provided with a second cylindrical hole that mates with the second cylindrical section; the rotating shaft (62) is rotatably mounted on the second fixed box (61) through the second cylindrical section and the second cylindrical hole; The second opening retaining ring (63) is inserted into the second recess; The horizontal manual turntable (72) is provided with a second female key that matches the second male key segment, and the horizontal manual turntable (72) is installed on the second male key segment via the second female key.

6. The LCD projector lens shifting device according to claim 4, characterized in that, The first common key is in the form of a flat key, a semi-circular key, or a spline.

7. The LCD projector lens shifting device according to claim 5, characterized in that, The second common key can be a flat key, a semi-circular key, or a spline.

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