Projection equipment

Abstract

This application discloses a projection device, belonging to the field of projection technology. The projection device includes a light source system, an optical engine system, and a lens; the lens includes a first lens group, a second lens group, and a focusing structure. The focusing structure is connected to at least one of the first and second lens groups. The focusing structure is used to move the connected lens group in a direction perpendicular to the principal optical axis of the lens. This allows the error between the optical axes of the various lens groups in the lens to be reduced by adjusting the structure, solving the problem of poor projection quality in related technologies and achieving an improvement in the projection quality of the projection device.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a projection device. Background Technology

[0002] A projection device is a device that can project a beam of light into an image.

[0003] A projection device may include a light source, an optical engine system, and a lens. The lens includes a lens barrel and multiple lens groups located within the lens barrel. Each lens group includes at least one lens element. These multiple lens groups are used to adjust the image beam. To improve the optical performance of the lens, the optical axis errors between the various lens groups are minimized when assembling them in the lens barrel.

[0004] However, when there are many mirror groups, the optical axis error of each mirror group may be large, which will result in poor projection quality of the projection device. Summary of the Invention

[0005] This application provides a projection device. The technical solution is as follows:

[0006] According to a first aspect of this application, a projection device is provided, the projection device comprising a light source system, an optical engine system, and a lens;

[0007] The lens includes a first lens group, a second lens group, and a focusing structure. The focusing structure is connected to at least one of the first lens group and the second lens group, and the focusing structure is used to move the connected lens group in a direction perpendicular to the principal optical axis of the lens.

[0008] Optionally, the first lens assembly includes a first lens barrel and a lens located in the first lens barrel, and the second lens assembly includes a second lens barrel and a lens located in the second lens barrel, wherein the outer wall of the second lens barrel has a first slot;

[0009] The focusing structure includes an adjusting ring and a first rotating ring. The adjusting ring and the first rotating ring are sleeved on the outside of the first lens barrel. The outer wall of the first rotating ring is cam-shaped, and the outer wall of the first rotating ring has a first protrusion and a rotating part with a radius smaller than the first protrusion. The inner wall of the first rotating ring engages with the outer wall of the first lens barrel.

[0010] The adjusting ring includes a tubular baffle and a first insert block located on the tubular baffle. The first insert block is located in the first slot. The inner wall of the tubular baffle has a first diameter reduction structure at a designated position. The first diameter reduction structure and the first insert block are located at different positions in the circumferential direction of the tubular baffle.

[0011] One end of the tubular baffle is fitted over the first rotating ring, and the first protrusion of the first rotating ring contacts the inner wall of the tubular baffle. When the first protrusion of the first rotating ring rotates to the first diameter reduction structure of the tubular baffle, it can push the adjusting ring to drive the first lens barrel to move relative to the second lens barrel in a direction perpendicular to the main optical axis of the lens through the first insert block.

[0012] Optionally, the outer wall of the first lens barrel has a second slot;

[0013] The focusing structure further includes a second rotating ring, which is mounted on the second lens barrel. The outer wall of the second rotating ring is cam-shaped, and the outer wall of the second rotating ring has a second protrusion and a second rotating part with a radius smaller than the second protrusion. The inner wall of the second rotating ring engages with the outer wall of the second lens barrel.

[0014] The adjusting ring includes a second insert on the tubular retaining wall, the second insert being located in the second slot, and a second diameter reduction structure at a designated position on the inner wall of the tubular retaining wall, the second diameter reduction structure being located at a different position from the second insert in the circumferential direction of the tubular retaining wall;

[0015] The other end of the tubular baffle is fitted over the second rotating ring, and the second protrusion of the second rotating ring contacts the inner wall of the tubular baffle. When the second protrusion of the second rotating ring rotates to the diameter reduction structure of the tubular baffle, it can push the adjusting ring to drive the first lens barrel to move relative to the second lens barrel in a direction perpendicular to the main optical axis of the lens through the second insert block.

[0016] Optionally, the adjusting ring includes two first inserts, which are located on opposite sides of the tubular baffle, and the outer wall of the second lens barrel has two first slots, in which the two first inserts are located respectively.

[0017] The adjusting ring includes two second inserts, which are located on opposite sides of the tubular baffle. The outer wall of the first lens tube has two second slots, and the two second inserts are located in the two second slots respectively.

[0018] Optionally, the line connecting the positions of the two first inserts on the tubular retaining wall is perpendicular to the first connecting line, which is the perpendicular line between the position of the first reduced diameter structure on the tubular retaining wall and the axis of the tubular retaining wall.

[0019] The line connecting the positions of the two second inserts on the tubular retaining wall is perpendicular to the second connecting line, which is the perpendicular line between the position of the second reduced-diameter structure on the tubular retaining wall and the axis of the tubular retaining wall.

[0020] Optionally, the line connecting the positions of the two first inserts on the tubular retaining wall is perpendicular to the line connecting the positions of the two second inserts on the tubular retaining wall.

[0021] Optionally, the lens further includes a main lens barrel, wherein both the first lens barrel and the second lens barrel are located within the main lens barrel.

[0022] Optionally, the second lens barrel is fixedly connected to the main lens barrel.

[0023] Optionally, the lens further includes at least three elastic connectors, which are evenly arranged around the axis of the main lens barrel, and each elastic connector is connected to the first lens barrel and the second lens barrel respectively.

[0024] Optionally, the elastic connector is a spring sheet.

[0025] Optionally, the focusing structure further includes a first limiting wall extending from the edge of the first rotating ring toward the center away from the first rotating ring, the first limiting wall contacting the edge of the tubular wall near the first lens barrel.

[0026] The focusing structure also includes a second limiting wall extending from the edge of the second rotating ring toward the center of the second rotating ring, and the second limiting wall contacts the edge of the tubular wall on the side near the second lens barrel.

[0027] Optionally, the outer walls of both the first rotating ring and the second rotating ring are elliptical cam-shaped.

[0028] The beneficial effects of the technical solutions provided in this application include at least the following:

[0029] A projection device is provided, including a light source system, an optical engine system, and a lens. The lens includes two lens groups and a focusing structure connected to at least one of the two lens groups. The focusing structure enables the connected lens groups to move in a direction perpendicular to the principal optical axis of the lens, thereby reducing the error between the optical axes of the various lens groups in the lens. This solves the problem of poor projection quality in related technologies and improves the projection quality of the projection device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a structural block diagram of a projection device provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of a three-dimensional exploded structure of a lens provided in an embodiment of this application;

[0033] Figure 3 yes Figure 2 A cross-sectional view of the lens shown;

[0034] Figure 4 yes Figure 2 A schematic diagram of one structure of the first rotating ring in the lens shown;

[0035] Figure 5 yes Figure 2 A schematic diagram of another structure of the first rotating ring in the lens shown;

[0036] Figure 6 yes Figure 3 A schematic diagram of the structure of a first rotating ring and an adjusting ring in the lens shown;

[0037] Figure 7 yes Figure 3 The diagram shows another type of first rotating ring and adjustment ring in the lens.

[0038] Figure 8 yes Figure 3 The diagram shows another type of first rotating ring and adjustment ring in the lens.

[0039] Figure 9 yes Figure 2 A three-dimensional sectional view of the lens shown;

[0040] Figure 10 yes Figure 6 The diagram shows another structural schematic of the first rotating ring and the adjusting ring.

[0041] Figure 11 yes Figure 2 A schematic diagram of one structure of the adjustment ring in the lens shown;

[0042] Figure 12 yes Figure 11 A schematic diagram of a three-dimensional structure of the adjustment ring shown;

[0043] Figure 13 yes Figure 2 A schematic diagram of the three-dimensional structure of the second lens barrel shown;

[0044] Figure 14 This is a schematic diagram of another lens structure provided in an embodiment of this application;

[0045] Figure 15 yes Figure 2 Another cross-sectional view of the lens shown;

[0046] Figure 16 yes Figure 2 Another cross-sectional view of the lens shown;

[0047] Figure 17 yes Figure 15 A three-dimensional structural diagram of the first lens barrel in the lens shown;

[0048] Figure 18 yes Figure 3 The left view of the lens shown;

[0049] Figure 19 yes Figure 3 The diagram shows the three-dimensional structure of the lens.

[0050] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0052] Currently, projector lenses typically consist of multiple lens groups, each containing at least one lens element. These lens groups work together to adjust the image beam provided by the optical engine. Ideally, the optical axis of each lens group should coincide with the principal optical axis of the lens. However, due to assembly errors and the manufacturing precision of parts, there may be a significant deviation between the optical axis of the lens group and the principal optical axis of the lens, resulting in weaker optical performance. This problem is particularly severe when the lens contains a large number of lens groups and lenses, leading to poor projection quality.

[0053] This application provides a projection device that can solve this problem.

[0054] Figure 1 This is a structural block diagram of a projection device provided in an embodiment of this application. The projection device includes a light source system 10, an optical engine system 20, and a lens 30. Figure 2 yes Figure 1 The exploded view of the projection device shown shows that the lens 30 includes a focusing structure 31, a first lens group 321 and a second lens group 322. The focusing structure 31 is connected to at least one of the first lens group 321 and the second lens group 322. The focusing structure 31 is used to move the connected lens group in a direction perpendicular to the principal optical axis z of the lens.

[0055] In related technologies, the lens group in the lens can usually only move along the main optical axis, but cannot move in the direction perpendicular to the main optical axis, that is, it cannot achieve off-axis focusing function. However, in the projection device provided in the embodiments of this application, this function can be achieved through the focusing structure.

[0056] In summary, the embodiments of this application provide a projection device, including a light source system, an optical engine system, and a lens. The lens includes two lens groups and a focusing structure connected to at least one of the two lens groups. The focusing structure enables the connected lens groups to move in a direction perpendicular to the main optical axis of the lens, thereby reducing the error between the optical axes of the various lens groups in the lens. This solves the problem of poor projection quality in related technologies and improves the projection quality of the projection device.

[0057] Additionally, the light source system 10 can be used to provide various colored lights to the optomechanical system 20. The optomechanical system 20 is used to process the colored lights to obtain an image beam. The optomechanical system may include some driving circuits, control components, and light valve components from the projection device. The driving circuits may include laser driving circuits, phosphor wheel driving circuits, etc.; the control components may include a display panel. The light valve components may include digital micromirror devices (DMDs) and galvanometers, etc.

[0058] Figure 3 yes Figure 2 The image shows a cross-sectional view of the lens (the cross-section is a plane passing through the lens's principal optical axis z-axis and parallel to both the z-axis and the x-axis; the z-axis is perpendicular to the x-axis). Please refer to [reference needed]. Figure 2 and Figure 3 The first lens assembly 321 includes a first lens barrel 1a and a lens 1b located within the first lens barrel 1a. The second lens assembly 322 includes a second lens barrel 2a and a lens 2b located within the second lens barrel 2a. The outer wall of the second lens barrel 2a has a first slot 1c. Figure 3 Lens 1b and lens 2b were not cut.

[0059] The focusing structure 31 includes an adjusting ring 311 and a first rotating ring 312, which are fitted around the first lens barrel 1a. Figure 4 and Figure 5 As shown, it is Figure 2 The diagram shows the structure of the first rotating ring 312 in the lens from different perspectives. The outer wall of the first rotating ring 312 is cam-shaped, and the outer wall of the first rotating ring 312 has a first protrusion 1t and a first rotating part 1z with a radius smaller than the first protrusion 1t. The inner wall of the first rotating ring 312 engages with the outer wall of the first lens barrel.

[0060] In this embodiment, the first rotating ring 312 can be a cam structure. A cam can refer to a structure that can rotate around an axis and has a varying radius. Based on this, the first rotating ring 312 can have various structures. For example, the outer wall c1 and the inner wall c2 of the first rotating ring 312 can both be cylindrical, but the axis s1 of the outer wall c1 and the axis s2 of the inner wall c2 are not collinear. The inner wall c2 of the first rotating ring 312 engages with the outer wall of the first lens barrel 1a. Therefore, when the first rotating ring 312 rotates, it will rotate around the axis of the inner wall c2. Thus, the axis s2 of the inner wall c2 can be considered as the axis of the first rotating ring 312, and the distance between the axis s2 and various positions of the outer wall of the first rotating ring 312 can be considered as the radius of the first rotating ring 312.

[0061] Since the axis s1 of the outer wall c1 and the axis s2 of the inner wall c2 are not collinear, the radii of the first rotating ring 312 are different at different positions, resulting in a first protrusion 1t with a larger radius and a first rotating part 1z with a smaller radius.

[0062] It should be noted that the radius r1 of the first protrusion 1t is larger than the radius r2 of the first rotating part 1z. However, since the adjustments to the optical axis of the lens assembly are extremely small, such as micrometer-level and millimeter-level adjustments, the radius r1 of the first protrusion 1t is only a few micrometers or millimeters larger than the radius r2 of the first rotating part 1z. Therefore, in Figure 4 and Figure 5 It may be difficult to see that the outer wall of the first rotating ring 312 is cam-shaped.

[0063] For a clearer explanation of the structure of the first rotating ring 312, please refer to [reference needed]. Figure 6 This is a schematic diagram of the structure of the first rotating ring 312 and the adjusting ring 311. The deviation between the axis s1 of the outer wall c1 and the axis s2 of the inner wall c2 is relatively large, and the radius r1 of the first protrusion 1t is much larger than the radius r2 of the first rotating part 1z.

[0064] Of course, the first rotating ring 312 can also be other structures, for example, such as Figure 7 As shown, it is a schematic diagram of another type of first rotating ring 312 and adjusting ring 311. The outer wall c1 of the first rotating ring 312 is elliptical, the inner wall c2 is circular, and the outer wall c1 and the inner wall c2 are not coaxial.

[0065] Or, such as Figure 8 As shown, it is a schematic diagram of another type of first rotating ring 312 and adjusting ring 311. The outer wall c1 of the first rotating ring 312 is a circle with a first protrusion 1t, the inner wall c2 is a circle, and the outer wall c1 and the inner wall c2 are coaxial.

[0066] Optionally, the outer walls of the first rotating ring 312 and the second rotating ring 314 are both elliptical cam-shaped. The outer diameters of the elliptical cam-shaped first rotating ring 312 and the second rotating ring 314 can smoothly transition from a smaller rotating part to a larger protruding part, making the rotation of the outer wall of the first rotating ring 312 and the second rotating ring 314 smoother, and the adjustment of the optical axis also smoother.

[0067] For example, the major axis of the elliptical cam-shaped first rotating ring is 0.2 mm longer than its minor axis. Thus, when the first rotating ring rotates 360 degrees, the off-axis focusing amount is 0.2 mm. The off-axis focusing amount corresponding to each 1° rotation of the first rotating ring is 0.556 μm, which meets the requirements for precise adjustment.

[0068] Figure 9 yes Figure 2 Another three-dimensional sectional view of the lens is shown (the section is a plane passing through the principal optical axis z-axis of the lens and parallel to both the z-axis and y-axis, with the y-axis perpendicular to the z-axis). This is to clearly show the structure of the focusing mechanism. Figure 9 The first lens tube and the lenses within each lens tube are not shown. Please refer to [reference needed]. Figure 3 and Figure 9 The adjusting ring 311 includes a tubular baffle 1d and a first insert 1e located on the tubular baffle 1d, with the first insert 1e partially located in the first slot 1c. One end of the tubular baffle 1d is fitted over the first rotating ring 312.

[0069] Please refer to Figures 6 to 8 The tubular retaining wall 1d has a first diameter reduction structure 1f at a designated position on its inner wall, and the first diameter reduction structure 1f and the first insert ( Figures 6 to 8 (The first insert block is not shown) is located at different positions along the circumference of the tubular retaining wall 1d. It can be seen that the inner wall of the tubular retaining wall 1d is arc-shaped, but the first diameter reduction structure 1f is planar, so the diameter of the first diameter reduction structure 1f is smaller than the diameter at other positions.

[0070] Figure 10 yes Figure 6 The diagram shows another structural schematic of the first rotating ring and the adjusting ring. Figure 10 The structure of the first rotating ring after rotating 90 degrees counterclockwise is shown. Please refer to... Figure 6When the first protrusion 1t of the first rotating ring 312 is not rotated to the first diameter-reducing structure 1f of the adjusting ring 311, it can fit against the inner wall of the tubular baffle 1d, or it can have a certain gap between itself and the inner wall of the tubular baffle 1d (the sum of this gap and the radius r1 at the first protrusion 1t needs to be greater than the radius at the first diameter-reducing structure 1f and the tubular baffle 1d). After rotating 90 degrees counterclockwise, the first rotating ring 312 can... Figure 10 As shown, the first protrusion 1t of the first rotating ring 312 rotates to the first diameter reduction structure 1f of the adjusting ring 311 and applies a thrust along the y-axis to the adjusting ring 311.

[0071] Please refer to Figure 9 The adjusting ring 311 will pass through the first insert block 1e inserted into the first slot 1c on the second lens barrel 2a. The thrust is transmitted to the second lens barrel 2a. Since the inner wall of the first rotating ring 312 engages with the outer wall of the first lens barrel, the thrust is converted into a force of interaction between the first and second lens barrels in the y-axis direction. This interaction force can cause the first and second lens barrels to move relative to each other in the y-axis direction, so as to achieve the effect of adjusting the optical axis of the first or second lens group in the y-axis direction.

[0072] Please refer to Figure 11 and Figure 12 , Figure 11 for Figure 2 The diagram shows a structural schematic of the adjustment ring 311 in the lens shown. Figure 12 yes Figure 11 The diagram shows a three-dimensional structure of the adjusting ring 311. A first diameter reduction structure 1f is located at a designated position on the inner wall of the tubular retaining wall 1d. The first diameter reduction structure 1f and the first insert block 1e are located at different positions in the circumferential direction of the tubular retaining wall 1d.

[0073] Additionally, please refer to Figure 13 , Figure 13 yes Figure 2 The diagram shows a three-dimensional structure of the second lens barrel 2a, which has a first slot 1c.

[0074] It should be noted that the first lens group and the second lens group can be any two adjacent lens groups in the lens, or they can be lens groups that have a significant impact on the optical performance of the lens. This application does not impose any restrictions on this.

[0075] Please refer to Figure 14 , Figure 14 This is a schematic diagram of another lens structure provided in an embodiment of this application. The lens... Figure 2The lens shown has undergone some adjustments. The lens also includes a main lens barrel 34, within which both the first lens barrel 1a and the second lens barrel 2a are located. The main lens barrel 34 can serve as a support for the various lens barrels within the lens, used to mount the lens barrels of each lens group.

[0076] In one exemplary embodiment, the outer wall of the second lens barrel 2a engages with the inner wall of the main lens barrel 34, that is, the main lens barrel 34 can restrict the second lens barrel to only move along the z-axis and rotate along the axis of the second lens barrel. Based on this, when the first rotating ring 312 rotates, it applies a thrust along the first direction of the y-axis to the adjusting ring 311. The adjusting ring 311 then transmits this thrust to the second lens barrel 2a through the first insert. Due to the restriction of the main lens barrel 34, the second lens barrel 2a cannot move in the first direction of the y-axis. Consequently, under the action of the main lens barrel 34, it applies a force in the second direction of the y-axis to the adjusting ring 311 (the first and second directions of the y-axis are two opposite directions; for example, one of the first and second directions is positive, and the other is negative). This force in the second direction of the y-axis is transmitted sequentially through the adjusting ring 311 and the first rotating ring 312 to the first lens 1a. Under the action of this force in the second direction of the y-axis, the first lens barrel 1a moves in the second direction of the y-axis, thereby causing the optical axis of the first lens group to move in the second direction of the y-axis. Similarly, when the outer wall of the first lens barrel engages with the inner wall of the main lens barrel, the optical axis of the second lens group can also move in the second direction of the y-axis.

[0077] It should be noted that, as Figure 11 As shown, when the adjusting ring 311 has two first diameter reduction structures 1f facing each other in the circumferential direction, and the line connecting these two first diameter reduction structures 1f is perpendicular to the line connecting the two first inserts 1e, rotating the first rotating ring can adjust the optical axis of the first lens barrel in both positive and negative directions of the y-axis.

[0078] Figure 15 yes Figure 2 The diagram shows another cross-sectional view of the lens (the cross-section is a plane passing through the principal optical axis z-axis of the lens and parallel to both the z-axis and y-axis). Figure 16 yes Figure 2 The diagram shows another cross-sectional view of the lens (the cross-section is a plane passing through the principal optical axis z-axis of the lens and parallel to both the z-axis and x-axis). This is to clearly illustrate the structure of the adjustment ring. Figure 16 The first lens barrel and lenses are not shown in the diagram. Please refer to [reference needed]. Figure 15 and Figure 16 The outer wall of the first lens tube 1a has a second slot 2c.

[0079] The focusing structure 31 also includes a second rotating ring 314. The adjusting ring 311 and the second rotating ring 314 are mounted on the second lens barrel 2a. The outer wall of the second rotating ring 314 is cam-shaped, and the outer wall of the second rotating ring 314 has a second protrusion and a second rotating part with a radius smaller than the second protrusion. The inner wall of the second rotating ring 314 engages with the outer wall of the second lens barrel 2a. The structure of the second rotating ring 314 can be referred to... Figures 4 to 8 The structure of the first rotating ring shown is not described in detail here as per the embodiments of this application.

[0080] Please refer to Figure 15 as well as Figure 11 The adjusting ring 311 includes a second insert 2e located on the tubular retaining wall 1d, the second insert 2e being partially located in the second slot 2c, and a second diameter reduction structure 2f having a designated position on the inner wall of the tubular retaining wall 1d, the second diameter reduction structure 2f being located at a different position from the second insert 2e in the circumferential direction of the tubular retaining wall 1d.

[0081] The other end of the tubular baffle 1d is fitted over the second rotating ring 314. The method of adjusting the optical axis of the first or second mirror group via the second rotating ring 314 is similar to that of the first rotating ring. Specifically, when the second rotating ring 314 is rotated, the second protrusion of the second rotating ring 314 rotates to the second diameter-reducing structure of the adjusting ring 311, and applies a thrust in the x-axis direction to the adjusting ring 311. Please refer to... Figure 15 The adjusting ring 311 transmits the thrust to the first lens barrel 1a by inserting the second insert 2e into the second slot 2c of the first lens barrel 2a. Since the inner wall of the second rotating ring 314 engages with the outer wall of the second lens barrel 2a, the thrust is converted into an interaction force between the first lens barrel 1a and the second lens barrel 2a in the x-axis direction. This interaction force can cause the first lens barrel 1a and the second lens barrel 2a to move relative to each other in the x-axis direction, thereby achieving the effect of adjusting the optical axis of the first lens group or the second lens group in the x-axis direction.

[0082] For example, the lens may further include a main lens barrel, with the outer wall of the second lens barrel engaging with the inner wall of the main lens barrel. That is, the main lens barrel can restrict the second lens barrel to rotate only about its axis and move along the z-axis. Based on this, when the second lens barrel 2a is subjected to a thrust in the first direction of the x-axis transmitted by the second rotating ring 312, the second lens barrel 2a will, under the action of the main lens barrel 34, apply a force in the second direction of the x-axis (the first and second directions of the x-axis are two opposite directions; for example, one of the first and second directions is positive and the other is negative) to the second rotating ring 312. The second rotating ring 312 transmits the force in the second direction of the x-axis to the adjusting ring 311, and the adjusting ring 311 transmits the force in the second direction of the x-axis to the first lens barrel 1a, so that the first lens barrel 1a moves relative to the second lens barrel 2a in the second direction of the x-axis, thereby realizing the movement of the optical axis of the first lens group in the x-axis direction. Similarly, when the outer wall of the first lens tube engages with the inner wall of the main lens tube, the optical axis of the second lens group can also be moved in the x-axis direction.

[0083] It should be noted that the above-mentioned x-axis and y-axis are both perpendicular to the z-axis. When the x-axis and y-axis are axes in different directions, the first rotating ring and the second rotating ring can adjust the optical axis in two directions respectively.

[0084] In one exemplary embodiment, the x-axis and y-axis are two mutually perpendicular axes. In this structure, the first rotating ring and the second rotating ring can adjust the optical axis in two mutually perpendicular directions, respectively.

[0085] It should be noted that, as Figure 11 As shown, when the adjusting ring 311 has two second diameter reduction structures 2f facing each other in the circumferential direction, and the line connecting these two second diameter reduction structures 2f is perpendicular to the line connecting the two second inserts 2e, rotating the second rotating ring can adjust the optical axis of the first lens barrel of the rod in both the positive and negative directions of the x-axis.

[0086] For example, please refer to Figure 17 , Figure 17 for Figure 15 The diagram shows a three-dimensional structure of the first lens barrel 1a, which has a second slot 2c on its outer wall.

[0087] Please refer to Figure 3 as well as Figure 11The adjusting ring 311 includes two first inserts 1e, which are located on opposite sides of the tubular baffle 1d. The outer wall of the second lens barrel 2a has two first slots 1c, and the two first inserts 1e of the adjusting ring 311 are located in the two first slots 1c. With this structure, the line connecting the two first inserts 1e passes through the axis of the adjusting ring 311, and the line connecting the two first slots 1c also passes through the axis of the second lens barrel 2a. This makes the thrust exerted by the first inserts 1e on the second lens barrel 2a more balanced, reducing the possibility of the second lens barrel 2a tilting.

[0088] Similarly, the adjusting ring 311 includes two second inserts 2e, which are located on opposite sides of the tubular baffle 1d. The outer wall of the first lens barrel 1a has two second slots 2c, and the two second inserts 2e are located in the two second slots 2c respectively. In this structure, the line connecting the two second inserts 2e passes through the axis of the adjusting ring 311, and the line connecting the two second slots 2c also passes through the axis of the second lens barrel 2a. This makes the thrust exerted by the second inserts 2e on the first lens barrel 1a more balanced, reducing the possibility of the first lens barrel 1a tilting.

[0089] In one exemplary embodiment, the line connecting the positions of the two first inserts 1e on the tubular retaining wall 1d is perpendicular to a first connecting line, which is a perpendicular line connecting the position of the first tapered structure 1f on the tubular retaining wall 1d and the axis of the tubular retaining wall 1d. With this structure, the force of the first rotating ring 312 can be uniformly applied to the second lens barrel 2a, and the second lens barrel 2a and the first lens barrel 1a can move in a direction perpendicular to the line connecting the two first inserts 1e.

[0090] The line connecting the positions of the two second inserts 2e on the tubular retaining wall 1d is perpendicular to the second connecting line, which is the perpendicular line between the position of the second tapered structure 2f on the tubular retaining wall 1d and the axis of the tubular retaining wall 1d. With this structure, the force of the second rotating ring 314 can be applied evenly to the first lens barrel 1a, and the second lens barrel 2a and the first lens barrel 1a can move in a direction perpendicular to the line connecting the two second inserts 2e.

[0091] Please refer to Figure 11 The adjusting ring 311 also includes a central baffle 1x, which separates the first insert 1e and the second insert 2e, such that the first insert 1e is located on one side of the axial direction of the tubular baffle 1d, and the second insert 2e is located on the other side of the axial direction of the tubular baffle 1d. Figure 11 To illustrate the second insert, the second insert 2e, which is obscured by the central retaining wall 1x, is shown in dashed lines.

[0092] In one exemplary embodiment, the line connecting the positions of the two first inserts 1e on the tubular retaining wall 1d is perpendicular to the line connecting the positions of the two second inserts 2e on the tubular retaining wall 1d.

[0093] With this structure, the first rotating ring 312 and the second rotating ring 314 can adjust the first lens barrel 1a and the second lens barrel 2a in two mutually perpendicular directions.

[0094] Based on the structure disclosed above, the optical axis of the first mirror group can be adjusted in two directions by rotating the first rotating ring 312 and the second rotating ring 314.

[0095] In one exemplary embodiment, please refer to Figure 3 and Figure 4 The focusing structure 31 also includes a first limiting wall 315 extending from the edge of the first rotating ring 312 toward the center away from the first rotating ring 312. The first limiting wall 315 contacts the edge of the tubular wall 1d near the first lens barrel 1a. The first limiting wall 315 is used to limit the relative position between the first rotating ring 312 and the tubular wall 1d in the z-axis direction, preventing the first protrusion 1t of the first rotating ring 312 from failing to contact the first diameter reduction structure 1f. Figure 4 In the first rotating ring 312 shown, the first limiting barrier 315 is gear-shaped, which facilitates the rotation of the first rotating ring 312. Of course, the first limiting barrier 315 can also be other shapes, such as a ring, and this embodiment does not limit it.

[0096] Similarly, the focusing structure 31 also includes a second limiting wall extending from the edge of the second rotating ring 314 toward the center away from the second rotating ring 314. The second limiting wall contacts the edge of the tubular wall 1d near the second lens barrel 2a. This second limiting wall is used to limit the relative position between the second rotating ring 314 and the tubular wall 1d, preventing the second protrusion 2t of the second rotating ring 314 from failing to contact the second diameter reduction structure 2f. The structure of the second limiting wall can be referenced. Figure 3 and Figure 4 The first limiting barrier in the first rotating ring 312 shown.

[0097] Figure 18 yes Figure 3 The left view of the lens shown. Figure 19 yes Figure 3 The diagram shows the three-dimensional structure of the lens. Please refer to it. Figure 3 , Figure 18 as well as Figure 19In one exemplary embodiment, the lens 30 further includes at least three elastic connectors 35. The at least three elastic connectors 35 are evenly arranged around the axis of the main lens barrel 34, and each elastic connector 35 is connected to the first lens barrel 1a and the second lens barrel 2a respectively. With this structure, the elastic connectors 35 can prevent the optical axis of the first lens group from tilting relative to the second lens group during optical axis adjustment. That is, it can ensure that the optical axis of the first lens group remains parallel to the optical axis of the second lens group during adjustment, thus preventing the adjustment of the optical axis of the first lens group from affecting the optical performance of the lens. Optionally, one end of the elastic connector 35 can engage with the first lens barrel, and the other end can be threadedly connected to the outer wall of the second lens barrel via a screw 36.

[0098] For example, there are three elastic connectors 35, and these three elastic connectors 35 can be arranged at 120-degree intervals around the axis of the main lens barrel 34. Among them, the elastic connectors 35 can be spring sheets.

[0099] The lens provided in this application embodiment may also include other lens groups. In an exemplary embodiment, the lens further includes a rear lens group 32, a middle lens group, and a front lens group arranged sequentially along the optical path direction.

[0100] The rear group of lenses includes the first lens group 321 and the second lens group 322.

[0101] The lens provided in this application embodiment enables the regrouping of the rear lens group within the lens barrel, and allows for micron-level off-axis adjustment of one of the lens groups. Furthermore, during adjustment, the two lens groups can maintain radial parallelism and do not interfere with each other.

[0102] In summary, the embodiments of this application provide a projection device, including a light source system, an optical engine system, and a lens. The lens includes two lens groups and a focusing structure connected to at least one of the two lens groups. The focusing structure enables the connected lens groups to move in a direction perpendicular to the main optical axis of the lens, thereby reducing the error between the optical axes of the various lens groups in the lens. This solves the problem of poor projection quality in related technologies and improves the projection quality of the projection device.

[0103] For the lens provided in this application embodiment, the optical axis of the first lens group can be adjusted by rotating at least one of the first rotating ring and the second rotating ring, so as to reduce the error between the optical axis of the first lens group and the system optical axis of the lens.

[0104] After adjustment, the first rotating ring and the adjusting ring can be fixed (for example, by applying adhesive), and the second rotating ring and the adjusting ring can be fixed to prevent unnecessary rotation during subsequent use.

[0105] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0106] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projection device, characterized in that, The projection device includes a light source system, an optical engine system, and a lens; The lens includes a first lens group, a second lens group, and a focusing structure. The focusing structure is connected to at least one of the first lens group and the second lens group, and the focusing structure is used to move the connected lens group in a direction perpendicular to the principal optical axis of the lens. The first lens assembly includes a first lens barrel and a lens located in the first lens barrel; the second lens assembly includes a second lens barrel and a lens located in the second lens barrel; and the outer wall of the second lens barrel has a first slot. The focusing structure includes an adjusting ring and a first rotating ring. The adjusting ring and the first rotating ring are sleeved on the outside of the first lens barrel. The outer wall of the first rotating ring is cam-shaped, and the outer wall of the first rotating ring has a first protrusion and a rotating part with a radius smaller than the first protrusion. The inner wall of the first rotating ring engages with the outer wall of the first lens barrel. The adjusting ring includes a tubular baffle and a first insert block located on the tubular baffle. The first insert block is located in the first slot. The inner wall of the tubular baffle has a first diameter reduction structure at a designated position. The first diameter reduction structure and the first insert block are located at different positions in the circumferential direction of the tubular baffle. One end of the tubular baffle is fitted over the first rotating ring, and the first protrusion of the first rotating ring contacts the inner wall of the tubular baffle. When the first protrusion of the first rotating ring rotates to the first diameter reduction structure of the tubular baffle, it can push the adjusting ring to drive the first lens barrel to move relative to the second lens barrel in a direction perpendicular to the main optical axis of the lens through the first insert block.

2. The projection device according to claim 1, characterized in that, The outer wall of the first lens barrel has a second slot; The focusing structure further includes a second rotating ring, which is mounted on the second lens barrel. The outer wall of the second rotating ring is cam-shaped, and the outer wall of the second rotating ring has a second protrusion and a second rotating part with a radius smaller than the second protrusion. The inner wall of the second rotating ring engages with the outer wall of the second lens barrel. The adjusting ring includes a second insert on the tubular retaining wall, the second insert being located in the second slot, and a second diameter reduction structure at a designated position on the inner wall of the tubular retaining wall, the second diameter reduction structure being located at a different position from the second insert in the circumferential direction of the tubular retaining wall; The other end of the tubular baffle is fitted over the second rotating ring, and the second protrusion of the second rotating ring contacts the inner wall of the tubular baffle. When the second protrusion of the second rotating ring rotates to the diameter reduction structure of the tubular baffle, it can push the adjusting ring to drive the first lens barrel to move relative to the second lens barrel in a direction perpendicular to the main optical axis of the lens through the second insert block.

3. The projection device according to claim 2, characterized in that, The adjusting ring includes two first inserts, which are located on opposite sides of the tubular baffle. The outer wall of the second lens barrel has two first slots, and the two first inserts are located in the two first slots respectively. The adjusting ring includes two second inserts, which are located on opposite sides of the tubular baffle. The outer wall of the first lens tube has two second slots, and the two second inserts are located in the two second slots respectively.

4. The projection device according to claim 3, characterized in that, The line connecting the positions of the two first inserts on the tubular retaining wall is perpendicular to the first connecting line, which is the perpendicular line between the position of the first reduced diameter structure on the tubular retaining wall and the axis of the tubular retaining wall. The line connecting the positions of the two second inserts on the tubular retaining wall is perpendicular to the second connecting line, which is the perpendicular line between the position of the second reduced-diameter structure on the tubular retaining wall and the axis of the tubular retaining wall.

5. The projection device according to claim 3, characterized in that, The line connecting the positions of the two first inserts on the tubular retaining wall is perpendicular to the line connecting the positions of the two second inserts on the tubular retaining wall.

6. The projection device according to claim 2, characterized in that, The lens also includes a main lens barrel, with both the first lens barrel and the second lens barrel located within the main lens barrel, and the second lens barrel being fixedly connected to the main lens barrel.

7. The projection device according to claim 6, characterized in that, The lens also includes at least three elastic connectors, which are evenly arranged around the axis of the main lens barrel, and each elastic connector is connected to the first lens barrel and the second lens barrel respectively.

8. The projection device according to claim 7, characterized in that, The elastic connector is a spring sheet.

9. The projection device according to claim 2, characterized in that, The focusing structure further includes a first limiting wall extending from the edge of the first rotating ring toward the center away from the first rotating ring, and the first limiting wall contacts the edge of the tubular wall on the side near the first lens barrel. The focusing structure also includes a second limiting wall extending from the edge of the second rotating ring toward the center of the second rotating ring, and the second limiting wall contacts the edge of the tubular wall on the side near the second lens barrel.

10. The projection device according to claim 2, characterized in that, The outer walls of both the first rotating ring and the second rotating ring are elliptical cam-shaped.

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