Lens device and projection apparatus

Abstract

The present disclosure relates to a lens device and a projection device. The lens device comprises a base, a lens, a driving mechanism and a detection mechanism. The lens has an optical axis direction. The driving mechanism is connected to the base, and the driving mechanism is drivingly connected to the lens. The driving mechanism is configured to drive the lens to move in a first direction, which is perpendicular or obliquely intersected with the optical axis direction. The detection mechanism comprises a first magnetic member and a first sensing member. One of the first magnetic member and the first sensing member is arranged on the base, and the other of the first magnetic member and the first sensing member is arranged on the lens. The first sensing member is configured to detect a magnetic signal of the first magnetic member in real time to obtain a displacement amount of the lens relative to the base in the first direction. The present disclosure has the beneficial effect of improving the detection accuracy of the position of the lens or the position of the projection picture.

Description

Technical Field

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

[0002] Projectors can adjust the position of the projected image by changing the position of the lens. However, in related technologies, the detection accuracy of the change in lens position is not high, resulting in problems with the precision of adjusting the position of the lens or the projected image. Utility Model Content

[0003] This disclosure provides a lens device and a projection device that can achieve precise adjustment and recognition of the position of the lens or the position of the projected image.

[0004] In a first aspect, this disclosure provides a lens device, including a base, a lens, a driving mechanism, and a detection mechanism. The lens has an optical axis. The driving mechanism is connected to the base and is drively connected to the lens. The driving mechanism is used to drive the lens to move along a first direction, which is perpendicular to or obliquely intersecting the optical axis. The detection mechanism includes a first magnetic element and a first sensing element. One of the first magnetic element and the first sensing element is disposed on the base, and the other of the first magnetic element and the first sensing element is disposed on the lens. The first sensing element is used to detect the magnetic signal of the first magnetic element in real time to obtain the displacement of the lens relative to the base along the first direction.

[0005] The driving mechanism includes a first displacement member and a first driving member. The first displacement member is movably disposed on the base along the first direction. The first driving member is connected to the first displacement member. The lens is connected to the first displacement member. The first magnetic member is connected to the first displacement member. The first sensing member is connected to the base.

[0006] The base is provided with a first limiting part, the first displacement member is provided with a second limiting part, the second limiting part cooperates with the first limiting part to limit the travel of the second limiting part along the first direction.

[0007] The base is provided with a first guide portion, the first displacement member is provided with a second guide portion, the second guide portion is movably disposed on the first guide portion along a first direction, and the first guide portion is used to guide the second guide portion to move along the first direction.

[0008] The driving mechanism includes a first displacement member and a second displacement member. The first displacement member is movably disposed on the base along a first direction, and the second displacement member is movably disposed on the first displacement member along a second direction. The lens is connected to the second displacement member, and the second direction, the first direction, and the optical axis direction intersect each other. The detection mechanism is used to detect the displacement of the lens relative to the base along the first direction and the second direction.

[0009] The detection mechanism further includes a second magnetic component and a second sensing component. One of the first magnetic component and the first sensing component is disposed on the base, and the other of the first magnetic component and the first sensing component is disposed on the first displacement component. The first sensing component is used to detect the magnetic signal of the first magnetic component in real time to obtain a first displacement amount of the first displacement component relative to the base. One of the second magnetic component and the second sensing component is disposed on the first displacement component, and the other of the second magnetic component and the second sensing component is disposed on the second displacement component. The second sensing component is used to detect the magnetic signal of the second magnetic component in real time to obtain a second displacement amount of the second displacement component relative to the first displacement component.

[0010] Wherein, the first magnetic component is connected to the first displacement component, and the first sensing component is connected to the base; and / or, the second magnetic component is connected to the second displacement component, and the second sensing component is connected to the first displacement component.

[0011] The base is provided with a first limiting part, the first displacement member is provided with a second limiting part, the second limiting part is in limiting cooperation with the first limiting part, and the first limiting part is used to limit the travel of the second limiting part along a first direction; and / or, the first displacement member is provided with a third limiting part, the second displacement member is provided with a fourth limiting part, the third limiting part is in limiting cooperation with the fourth limiting part, and the third limiting part is used to limit the travel of the fourth limiting part along a second direction.

[0012] The base is provided with a first guide portion, the first displacement member is provided with a second guide portion, the second guide portion is movably disposed on the first guide portion along a first direction, and the first guide portion is used to guide the second guide portion to move along the first direction; and / or, the first displacement member is provided with a third guide portion, the second displacement member is provided with a fourth guide portion, the fourth guide portion is movably disposed on the third guide portion along a second direction, and the third guide portion is used to guide the fourth guide portion to move along the second direction.

[0013] Secondly, this disclosure provides a projection device, including the aforementioned lens assembly and image chip. The image chip is fixedly disposed relative to the base of the lens assembly, and the image chip and the lens of the lens assembly are disposed corresponding to each other along a third direction. The image chip is used to project image light toward the lens.

[0014] Beneficial effects: According to the lens device and projection equipment provided in this disclosure, the lens can be moved in a first direction by a drive mechanism, causing the lens to move along a direction deviating from its optical axis. With the image light received by the lens fixed, the image projected by the lens can move with the lens's displacement. During this process, the first sensing element and the first magnetic element generate relative motion. The first sensing element can detect magnetic signals such as the magnetic field strength of the first magnetic element in real time, and then calculate the displacement based on the magnetic signals, thereby obtaining the displacement of the lens relative to the base along the first direction, and further obtaining the displacement of the image projected by the lens. This facilitates accurate identification and perception of the lens position or image position based on the precise displacement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a lens device according to an embodiment of the present disclosure.

[0017] Figure 2 This is a schematic diagram of the exploded structure of a lens device according to an embodiment of the present disclosure.

[0018] Figure 3 This is a schematic diagram of the lens device according to another embodiment of the present disclosure.

[0019] Figure 4 This is a schematic diagram of the lens device according to another embodiment of the present disclosure from another perspective.

[0020] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point V in the middle.

[0021] Figure 6 This is a schematic diagram of the exploded structure of a lens device according to another embodiment of the present disclosure.

[0022] Figure 7 This is a schematic diagram of the structure of a projection device according to an embodiment of the present disclosure.

[0023] Explanation of reference numerals in the attached figures: 100. Lens assembly; 10. Base; 11. First limiting part; 111. First limiting groove; 1111. First groove wall; 1112. Second groove wall; 12. First guide part; 121. First guide groove; 13. First edge; 14. First boss; 15. First mounting wall; 151. First clearance groove; 20. Lens; 30. Drive mechanism; 31. First displacement member; 311. Second limiting part; 312. Second guide part; 313. Second edge; 314. Third limiting part; 3141. Second limiting groove; 31411. Third groove wall; 31412. Fourth groove 315. Wall; 316. Third edge; 317. Third guide part; 318. Second guide groove; 319. Second boss; 310. Second mounting wall; 3118. Second clearance groove; 32. Second displacement member; 321. Fourth limiting part; 322. Fourth edge; 323. Fourth guide part; 33. First driving member; 34. Second driving member; 40. Detection mechanism; 41. First magnetic member; 42. First sensing member; 43. Second magnetic member; 44. Second sensing member; X, first direction; Y, second direction; Z, optical axis direction; 200. Projection device; 201. Image chip. Detailed Implementation

[0024] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0026] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0027] As the projection industry flourishes, users are increasingly accepting of home projectors and have higher demands for their performance and functionality. Some high-end home projectors can move the image by adjusting the position of the optical engine or lens without moving the projector itself. However, accurately sensing and recognizing the lens or image position in real time remains a significant technical challenge.

[0028] The lens shift function of related projectors is either manually adjusted or detected using traditional detection devices, resulting in low accuracy in detecting the position before and after lens shift.

[0029] See Figures 1 to 2 This embodiment provides a lens device 100, including a base 10, a lens 20, a drive mechanism 30, and a detection mechanism 40. The lens 20 has an optical axis direction Z. The drive mechanism 30 is connected to the base 10. The drive mechanism 30 is drivingly connected to the lens 20. The drive mechanism 30 is used to drive the lens 20 to move along a first direction X. The first direction X is perpendicular to or obliquely intersects the optical axis direction Z. The detection mechanism 40 includes a first magnetic element 41 and a first sensing element 42. One of the first magnetic element 41 and the first sensing element 42 is disposed on the base 10, and the other of the first magnetic element 41 and the first sensing element 42 is disposed on the lens 20. The first sensing element 42 is used to detect the magnetic signal of the first magnetic element 41 in real time to obtain the displacement of the lens 20 relative to the base 10 along the first direction X.

[0030] According to the lens device 100 and projection device 200 provided in this disclosure, the lens 20 is driven to move in the first direction X by the drive mechanism 30, which can cause the lens 20 to move in the direction Z, which is deviated from its optical axis. When the image light received by the lens 20 is fixed, the image projected by the lens 20 can move with the displacement of the lens 20. During this process, the first sensing element 42 and the first magnetic element 41 generate relative motion. The first sensing element 42 can detect magnetic signals such as the magnetic field strength of the first magnetic element 41 in real time, and then calculate the displacement based on the magnetic signals, thereby obtaining the displacement of the lens 20 relative to the base 10 in the first direction X, and further obtaining the displacement of the image projected by the lens 20. In this way, it is convenient to accurately identify and perceive the position of the lens 20 or the position of the image based on the accurate displacement.

[0031] In this embodiment, the first direction X is perpendicular to the optical axis direction Z. In other embodiments, the first direction X may also intersect the optical axis direction Z at an angle.

[0032] In this embodiment, the first sensing element 42 includes a TMR (Tunnel Magneto Resistance) chip. The TMR chip has high magnetic field sensitivity and can sense the minute magnetic field changes caused by the minute movement of the first magnetic element 41, and convert them into a sufficiently large electrical signal output, so that the first sensing element 42 can detect the micron- or nanometer-level displacement of the first magnetic element 41, thereby further improving the detection accuracy of lens 20 displacement or image displacement.

[0033] In other embodiments, the first sensing element 42 may also include one or more of a giant magnetoresistive (GMR) sensor, a linear Hall sensor, or anisotropic magnetoresistive sensor.

[0034] In some embodiments, see Figures 1 to 2 The drive mechanism 30 includes a first displacement member 31 and a first drive member 33. The first displacement member 31 is movably disposed on the base 10 along a first direction X. The first drive member 33 is drively connected to the first displacement member 31, and the lens 20 is connected to the first displacement member 31. A first magnetic member 41 is connected to the first displacement member 31. A first sensing member 42 is connected to the base 10. Thus, during the movement of the first displacement member 31, the first magnetic member 41 moves with the first displacement member 31, allowing the first sensing member 42 to directly detect the displacement of the first magnetic member 41. In the process of converting the displacement of the first displacement member 31 to the displacement of the lens 20, only the connection tolerance between the first displacement member 31 and the lens 20 is considered, without taking into account the error generated by the first drive member 33, thereby further improving the detection accuracy of the displacement of the lens 20 along the first direction X.

[0035] Optionally, the first driving component 33 can be a stepper motor or a servo motor, etc. The first driving component 33 can be directly connected to the first displacement component 31, or it can be connected to the first displacement component 31 through a transmission structure such as gears or lead screws.

[0036] In other embodiments, the first magnetic element 41 may also be connected to the lens 20. Alternatively, the first magnetic element 41 may be connected to the base 10, and the first sensing element 42 may be connected to the first displacement element 31.

[0037] In some embodiments, see Figures 1 to 2 The base 10 is provided with a first limiting part 11. The first displacement member 31 is provided with a second limiting part 311. The second limiting part 311 cooperates with the first limiting part 11 to limit the travel of the second limiting part 311 along the first direction X.

[0038] In this way, the displacement of the first displacement member 31 along the first direction X can be mechanically limited, as can the displacement of the lens 20 along the first direction X, thereby reducing the risk of damage to the surrounding components of the first displacement member 31 or the lens 20 during the movement along the first direction X.

[0039] In other embodiments, the displacement of the first displacement member 31 along the first direction X can be limited at the software level by controlling the operation of the first driving member 33.

[0040] In some embodiments, see Figure 2 The base 10 has a first edge 13 along one side of the second direction Y. The first displacement member 31 has a second edge 313 along one side of the second direction Y. The first sensing member 42 is connected to the first edge 13. The first magnetic member 41 is connected to the second edge 313. The first magnetic member 41 and the first sensing member 42 are spaced apart along the second direction Y. The second direction Y, the first direction X, and the optical axis direction Z intersect each other.

[0041] Optionally, the first magnetic component 41 and the first displacement component 31 are positioned and engaged. The positioning and engagement of the first magnetic component 41 and the first displacement component 31 means that the first magnetic component 41 and the first displacement component 31 are directly connected, and no other structure is set between the first magnetic component 41 and the first displacement component 31 to cause calculation errors in the displacement amount. Thus, the displacement amount of the first displacement component 31 can be converted into the error of the first magnetic component 41 with minimal error.

[0042] Specifically, there are multiple ways to achieve the positioning and cooperation between the first magnetic element 41 and the first displacement element 31. For example, the first magnetic element 41 can be directly attached to the surface of the second edge 313, the first magnetic element 41 can be embedded in the inside of the first edge 13, or the first magnetic element 41 can be set in the groove formed on the surface of the first edge 13.

[0043] In some embodiments, see Figure 1 and Figure 2 The first limiting portion 11 includes a first limiting groove 111. The first limiting groove 111 is formed at the first edge 13, and the extending direction of the first limiting groove 111 is parallel to the first direction X. The first limiting groove 111 has a first groove wall 1111 and a second groove wall 1112 disposed opposite to each other along the first direction X. The second limiting portion 311 protrudes from the second edge 313. The second limiting portion 311 extends into the first limiting groove 111. The length of the second limiting portion 311 along the first direction X is less than the distance between the first groove wall 1111 and the second groove wall 1112. A first magnetic element 41 connects to the second limiting portion 311. Thus, the first groove wall 1111 can limit the extreme position of one end of the second limiting portion 311 along the first direction X. The second groove wall 1112 can limit the extreme position of the other end of the second limiting portion 311 along the first direction X.

[0044] In other embodiments, the second limiting part 311 may be provided with a limiting groove, and the first limiting part 11 extends into the limiting groove. This embodiment will not elaborate further on this.

[0045] In some embodiments, see Figure 1 A first mounting wall 15 is provided on the first edge 13. The first mounting wall 15 and the second limiting portion 311 are spaced apart along the second direction Y. The first sensing element 42 is connected to the side of the first mounting wall 15 opposite to the first magnetic element 41. The first mounting wall 15 has a first clearance groove 151. The first magnetic element 41 extends into the first clearance groove 151. In this way, the first clearance groove 151 can avoid the movement stroke of the first magnetic element 41, thereby improving the integration of the lens device 100.

[0046] In some embodiments, see Figure 2 There are two first edges 13. There are two second edges 313. There are two first limiting parts 11. There are two second limiting parts 311. The base 10 has a first edge 13 on each side along the second direction Y. Each first edge 13 is connected to a first limiting part 11. The first displacement member 31 has a second edge 313 on each side along the second direction Y. Each second edge 313 is connected to a second limiting part 311. In this way, during the movement of the first displacement member 31, the second edges 313 on both sides along the second direction Y can be limited, thereby improving the limiting stability of the first displacement member 31.

[0047] In some embodiments, see Figures 1 to 2 The base 10 is provided with a first guide portion 12. The first displacement member 31 is provided with a second guide portion 312, which is movably disposed on the first guide portion 12 along the first direction X. The first guide portion 12 is used to guide the second guide portion 312 to move along the first direction X. In this way, the movement accuracy of the first displacement member 31 along the first direction X can be improved, thereby reducing the detection error of displacement caused by the movement direction error of the first displacement member 31.

[0048] In some embodiments, see Figures 1 to 2The first guide portion 12 includes a first guide groove 121. The extension direction of the first guide groove 121 is parallel to the first direction X. The extension direction of the second guide portion 312 is parallel to the first direction X, and the second guide portion 312 is movably disposed in the first guide groove 121 along the first direction X. In other embodiments, the second guide portion 312 may have a guide groove, and the first guide portion 12 may be movably disposed in the guide groove along the first direction X. In other embodiments, one of the first guide portion 12 or the second guide portion 312 may also be constructed as a guide hole, which extends through along the first direction X. The other of the first guide portion 12 or the second guide portion 312 is slidably fitted into the guide hole along the first direction X.

[0049] In some embodiments, see Figures 1 to 2 The base 10 has two first protrusions 14 at its first edge 13. The two first protrusions 14 are spaced apart along a first direction X. A first limiting groove 111 is formed between the two first protrusions 14. The first guide portion 12 includes a first guide groove 121. Each of the two first protrusions 14 has a first guide groove 121. There are two second guide portions 312. One second guide portion 312 is connected to one end of the second limiting portion 311 along the first direction X. The other second guide portion 312 is connected to the other end of the second limiting portion 311 along the first direction X. One second guide portion 312 is movably fitted into one first guide groove 121 along the first direction X. The other second guide portion 312 is movably fitted into the other first guide groove 121 along the first direction X. In this way, guiding and limiting functions can be integrated at the first edge 13 and the second edge 313, further improving the structural integration of the lens device 100.

[0050] See below. Figures 3 to 7 Another embodiment of the lens device 100 according to this application is described. The difference between this lens device 100 and the lens device 100 of the aforementioned embodiment is that this lens device 100 further includes a second displacement member 32, which drives the lens 20 to move along the second direction Y. In other embodiments, the lens device 100 may also include a third displacement member, a fourth displacement member, etc., with multiple displacement members connected sequentially and moving along different directions respectively to achieve displacement settings of the lens 20 in multiple directions. When the lens device 100 also includes other numbers of displacement members, the connection method between each displacement member can refer to the connection method between the first displacement member 31 and the second displacement member 32, and the corresponding driving mechanism 30 and detection mechanism 40 can also be adaptively configured, which will not be elaborated here.

[0051] In some embodiments, see Figure 3The driving mechanism 30 includes a first displacement member 31 and a second displacement member 32. The first displacement member 31 is movably disposed on the base 10 along a first direction X, and the second displacement member 32 is movably disposed on the first displacement member 31 along a second direction Y. The lens 20 is connected to the second displacement member 32, and the second direction Y, the first direction X, and the optical axis direction Z intersect each other. The detection mechanism 40 is used to detect the displacement of the lens 20 relative to the base 10 along the first direction X and the second direction Y.

[0052] Optionally, the plane containing the first direction X and the second direction Y is perpendicular to the optical axis direction Z. This prevents the lens 20 from moving along the optical axis direction Z during displacement, thus avoiding any impact on the focal length of the lens 20 and preventing changes in image sharpness. In other embodiments, the displacement plane may also intersect the optical axis direction Z at an angle; in this case, the lens 20 can be driven to move synchronously along the optical axis direction Z.

[0053] Optionally, the first direction X is perpendicular to the second direction Y. Thus, by making one of the first direction X and the second direction Y parallel to the horizontal direction of the image, and the other parallel to the vertical direction of the image, the lens 20 can be moved along the first direction X and the second direction Y via the drive mechanism 30, achieving the function of adjusting the image horizontally or vertically, thereby conforming to the user's usage habits. In other embodiments, depending on the different projection scenarios, the first direction X and the second direction Y can also be set at an angle to intersect.

[0054] Optionally, see Figure 3 The drive mechanism 30 also includes a second drive member 34. The second drive member 34 is fixedly connected to the first displacement member 31. The second drive member 34 is also drively connected to the second displacement member 32. The second drive member 34 is used to drive the second displacement member 32 to move relative to the first displacement member 31 along the second direction Y.

[0055] Optionally, the second drive component 34 can be a stepper motor or a servo motor, etc. The second drive component 34 can be directly connected to the second displacement component 32, or it can be connected to the second displacement component 32 through a transmission structure such as gears or lead screws.

[0056] In some embodiments, see Figure 3The detection mechanism 40 further includes a second magnetic element 43 and a second sensing element 44. One of the first magnetic element 41 and the first sensing element 42 is disposed on the base 10, and the other of the first magnetic element 41 and the first sensing element 42 is disposed on the first displacement element 31. The first sensing element 42 is used to detect the magnetic signal of the first magnetic element 41 in real time to obtain a first displacement amount of the first displacement element 31 relative to the base 10. One of the second magnetic element 43 and the second sensing element 44 is disposed on the first displacement element 31, and the other of the second magnetic element 43 and the second sensing element 44 is disposed on the second displacement element 32. The second sensing element 44 is used to detect the magnetic signal of the second magnetic element 43 in real time to obtain a second displacement amount of the second displacement element 32 relative to the first displacement element 31.

[0057] Thus, the first magnetic element 41 cooperates with the first sensing element 42 to obtain the first displacement of the first displacement element 31 along the first direction X. The second magnetic element 43 cooperates with the second sensing element 44 to obtain the second displacement of the second displacement element 32 along the second direction Y. By converting the first displacement and the second displacement, the displacement of the lens 20 along the first direction X and the displacement of the lens 20 along the second direction Y can be obtained.

[0058] In this embodiment, the second sensing element 44 includes a TMR (Tunnel Magneto Resistance) chip. The TMR chip has high magnetic field sensitivity and can sense the minute magnetic field changes caused by the minute movement of the second magnetic element 43, and convert them into a sufficiently large electrical signal output, so that the second sensing element 44 can detect the micron- or nanometer-level displacement of the second magnetic element 43, thereby further improving the detection accuracy of lens 20 displacement or image displacement.

[0059] In other embodiments, the second sensing element 44 may also include one or more of a giant magnetoresistive (GMR) sensor, a linear Hall sensor, or an anisotropic magnetoresistive sensor.

[0060] In some embodiments, the first magnetic element 41 is connected to the first displacement element 31, and the first sensing element 42 is connected to the base 10. The second magnetic element 43 is connected to the second displacement element 32, and the second sensing element 44 is connected to the first displacement element 31.

[0061] Thus, during the movement of the second displacement member 32, the second magnetic member 43 moves along with the second displacement member 32, allowing the second sensing member 44 to directly detect the displacement of the second magnetic member 43. In the process of converting the displacement of the second displacement member 32 to the displacement of the lens 20, only the connection tolerance between the second displacement member 32 and the lens 20 is included, and the error generated by the second driving member 34 is not taken into account, thereby further improving the detection accuracy of the displacement of the lens 20 along the second direction Y.

[0062] In other embodiments, the second magnetic element 43 can be directly connected to the lens 20. Alternatively, the second magnetic element 43 can be connected to the first displacement element 31, and the second sensing element 44 can be connected to the second displacement element 32.

[0063] In some embodiments, see Figures 3 to 5 The base 10 is provided with a first limiting part 11. The first displacement member 31 is provided with a second limiting part 311. The second limiting part 311 is in a limiting engagement with the first limiting part 11. The first limiting part 11 is used to limit the travel of the second limiting part 311 along the first direction X. The first displacement member 31 is provided with a third limiting part 314. The second displacement member 32 is provided with a fourth limiting part 321. The third limiting part 314 is in a limiting engagement with the fourth limiting part 321. The third limiting part 314 is used to limit the travel of the fourth limiting part 321 along the second direction Y. The structures of the first limiting part 11 and the second limiting part 311 can be referred to the description in the previous embodiment, and will not be repeated here.

[0064] In this way, the displacement of the second displacement member 32 along the second direction Y can be mechanically limited, as can the displacement of the lens 20 along the second direction Y, thereby reducing the risk of damage to the surrounding components of the second displacement member 32 or the lens 20 during the movement along the second direction Y.

[0065] In other embodiments, the displacement of the second displacement member 32 along the second direction Y can also be limited at the software level by controlling the operation of the second drive member 34.

[0066] In some embodiments, see Figure 4 The first displacement member 31 has a third edge 315 along one side of the first direction X. The second displacement member 32 has a fourth edge 322 along one side of the first direction X. The second sensing member 44 is connected to the third edge 315. The second magnetic member 43 is connected to the fourth edge 322. The second magnetic member 43 and the second sensing member 44 are spaced apart along the first direction X. The first direction X, the second direction Y, and the optical axis direction Z intersect each other.

[0067] Optionally, the second magnetic component 43 and the second displacement component 32 are positioned and engaged. This positioning and engagement means that the second magnetic component 43 and the second displacement component 32 are directly connected, and no other structures are provided between them that could cause errors in the displacement calculation. Therefore, the displacement of the second displacement component 32 can be converted into the error of the second magnetic component 43 with minimal error.

[0068] Specifically, there are multiple ways to achieve the positioning and cooperation between the second magnetic element 43 and the second displacement element 32. For example, the second magnetic element 43 can be directly attached to the surface of the fourth edge 322, the second magnetic element 43 can be embedded in the interior of the third edge 315, or the second magnetic element 43 can be set in the groove formed on the surface of the third edge 315.

[0069] In some embodiments, see Figure 5 and Figure 6 The third limiting portion 314 includes a second limiting groove 3141. The second limiting groove 3141 is formed at the third edge 315. The extending direction of the second limiting groove 3141 is parallel to the second direction Y. The second limiting groove 3141 has a third groove wall 31411 and a fourth groove wall 31412 disposed opposite to each other along the second direction Y. A fourth limiting portion 321 is provided at the fourth edge 322 and extends into the second limiting groove 3141. The length of the fourth limiting portion 321 along the second direction Y is less than the distance between the third groove wall 31411 and the fourth groove wall 31412. A second magnetic member 43 connects to the fourth limiting portion 321. Thus, the third groove wall 31411 can limit the extreme position of one end of the fourth limiting portion 321 along the second direction Y. The fourth groove wall 31412 can limit the extreme position of the other end of the fourth limiting portion 321 along the second direction Y.

[0070] In other embodiments, the fourth limiting part 321 may be provided with a limiting groove, and the third limiting part 314 extends into the limiting groove. This embodiment will not elaborate further on this.

[0071] In some embodiments, see Figure 6 The fourth edge 322 is provided with a second mounting wall 318. The second mounting wall 318 and the fourth limiting portion 321 are spaced apart along the first direction X. The second sensing element 44 is connected to the side of the first mounting wall 15 opposite to the second magnetic element 43. The second mounting wall 318 has a second clearance groove 3181. The second magnetic element 43 extends into the first clearance groove 151. In this way, the second clearance groove 3181 can avoid the second magnetic element 43, thereby improving the integration of the lens device 100.

[0072] In some embodiments, see Figure 6There are two third edges 315, two fourth edges 322, two third limiting portions 314, and two fourth limiting portions 321. The first displacement member 31 has a third edge 315 on each side along the first direction X. Each third edge 315 is connected to a third limiting portion 314. The second displacement member 32 has a fourth edge 322 on each side along the first direction X. Each fourth edge 322 is connected to a fourth limiting portion 321. Thus, during the movement of the second displacement member 32, its fourth edges 322 on both sides along the first direction X can be limited, thereby improving the limiting stability of the second displacement member 32.

[0073] In some embodiments, see Figure 5 and Figure 6 The base 10 is provided with a first guide portion 12, and the first displacement member 31 is provided with a second guide portion 312. The second guide portion 312 is movably disposed on the first guide portion 12 along a first direction X, and the first guide portion 12 is used to guide the second guide portion 312 to move along the first direction X. The first displacement member 31 is provided with a third guide portion 316, and the second displacement member 32 is provided with a fourth guide portion 323. The fourth guide portion 323 is movably disposed on the third guide portion 316 along a second direction Y, and the third guide portion 316 is used to guide the fourth guide portion 323 to move along the second direction Y. The structures of the first guide portion 12 and the second guide portion 312 can be referred to the description in the previous embodiment, and will not be repeated here.

[0074] In this way, the motion accuracy of the second displacement member 32 along the second direction Y can be improved, thereby reducing the detection error of displacement caused by the error in the moving direction of the second displacement member 32.

[0075] In some embodiments, see Figure 5 and Figure 6 The third guide portion 316 includes a second guide groove 3161, the extension direction of which is parallel to the second direction Y. The fourth guide portion 323 extends in the same direction as the second direction Y, and is movably disposed within the second guide groove 3161 along the second direction Y. In other embodiments, the fourth guide portion 323 may have a guide groove, and the third guide portion 316 may be movably disposed within the guide groove along the second direction Y. In other embodiments, either the third guide portion 316 or the fourth guide portion 323 may be configured as a guide hole, extending through the second direction Y. The other of the third guide portion 316 or the fourth guide portion 323 may be slidably fitted into the guide hole along the second direction Y.

[0076] In some embodiments, see Figure 5 and Figure 6The first displacement member 31 has two second protrusions 317 at the third edge 315, which are spaced apart along the second direction Y, forming a second limiting groove 3141 between them. The third guide portion 316 includes a second guide groove 3161. Each of the two second protrusions 317 has a second guide groove 3161. There are two fourth guide portions 323. One fourth guide portion 323 is connected to one end of the fourth limiting portion 321 along the first direction X. The other fourth guide portion 323 is connected to the other end of the fourth limiting portion 321 along the first direction X. One fourth guide portion 323 is movably fitted into one second guide groove 3161 along the second direction Y. The other fourth guide portion 323 is movably fitted into the other second guide groove 3161 along the second direction Y. In this way, guiding and limiting functions can be integrated at the third edge 315 and the fourth edge 322, further improving the structural integration of the lens device 100.

[0077] See Figure 7 This embodiment provides a projection device 200, including the lens device 100 and image chip 201 described in the previous embodiment. The image chip 201 is fixedly disposed relative to the base 10 of the lens device 100, and the image chip 201 and the lens 20 of the lens device 100 are correspondingly disposed along a third direction. The image chip 201 is used to project image light toward the lens 20. The image chip 201 may be a Digital Micromirror Device (DMD) chip.

[0078] Since the projection device 200 includes the lens device 100 of any of the above embodiments, it has the beneficial effects of the lens device 100 of any of the above embodiments, which will not be described again here.

[0079] Optionally, the projection device 200 also includes an optical engine bracket (not shown in the figure). The image chip 201 is fixedly connected to the optical engine bracket to achieve a relatively fixed position between the image chip 201 and the base 10. Thus, by moving the first displacement member 31 relative to the base 10 along the first direction X, the lens 20 can be moved relative to the image chip 201 along the first direction X, thereby shifting the image emitted by the lens 20 along the first direction X. By moving the second displacement member 32 relative to the first displacement member 31 along the second direction Y, the lens 20 can be moved relative to the image chip 201 along the second direction Y, thereby shifting the image emitted by the lens 20 along the second direction Y.

[0080] The above description is merely an embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structural or procedural transformations made using the content of this disclosure and its drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this disclosure.

Claims

1. A lens device characterized by comprising: include: Base; The lens has an optical axis direction; A driving mechanism is connected to the base and is also connected to the lens. The driving mechanism is used to drive the lens to move along a first direction, which is perpendicular to or obliquely intersecting the optical axis. The detection mechanism includes a first magnetic component and a first sensing component. One of the first magnetic component and the first sensing component is disposed on the base, and the other of the first magnetic component and the first sensing component is disposed on the lens. The first sensing component is used to detect the magnetic signal of the first magnetic component in real time to obtain the displacement of the lens relative to the base along a first direction.

2. The lens device according to claim 1, characterized in that: The driving mechanism includes a first displacement member and a first driving member. The first displacement member is movably disposed on the base along the first direction. The first driving member is connected to the first displacement member. The lens is connected to the first displacement member. The first magnetic member is connected to the first displacement member. The first sensing member is connected to the base.

3. The lens device according to claim 2, characterized in that: The base is provided with a first limiting part, and the first displacement member is provided with a second limiting part. The second limiting part cooperates with the first limiting part in a limiting manner, and the first limiting part is used to limit the travel of the second limiting part along the first direction.

4. The lens device according to claim 2, characterized in that: The base is provided with a first guide portion, and the first displacement member is provided with a second guide portion. The second guide portion is movably disposed on the first guide portion along a first direction, and the first guide portion is used to guide the second guide portion to move along the first direction.

5. The lens device according to claim 1, characterized in that: The driving mechanism includes a first displacement member and a second displacement member. The first displacement member is movably disposed on the base along a first direction, and the second displacement member is movably disposed on the first displacement member along a second direction. The lens is connected to the second displacement member, and the second direction, the first direction, and the optical axis direction intersect each other. The detection mechanism is used to detect the displacement of the lens relative to the base along the first direction and the second direction.

6. The lens device according to claim 5, characterized in that: The detection mechanism further includes a second magnetic component and a second sensing component. One of the first magnetic component and the first sensing component is disposed on the base, and the other of the first magnetic component and the first sensing component is disposed on the first displacement component. The first sensing component is used to detect the magnetic signal of the first magnetic component in real time to obtain the first displacement amount of the first displacement component relative to the base. One of the second magnetic element and the second sensing element is disposed on the first displacement element, and the other of the second magnetic element and the second sensing element is disposed on the second displacement element. The second sensing element is used to detect the magnetic signal of the second magnetic element in real time to obtain the second displacement amount of the second displacement element relative to the first displacement element.

7. The lens device according to claim 6, characterized in that: The first magnetic component is connected to the first displacement component, and the first sensing component is connected to the base; And / or, the second magnetic element is connected to the second displacement element, and the second sensing element is connected to the first displacement element.

8. The lens device according to claim 5, characterized in that: The base is provided with a first limiting part, and the first displacement member is provided with a second limiting part. The second limiting part cooperates with the first limiting part in a limiting manner, and the first limiting part is used to limit the travel of the second limiting part along the first direction. And / or, the first displacement member is provided with a third limiting part, the second displacement member is provided with a fourth limiting part, the third limiting part and the fourth limiting part are mutually limiting, and the third limiting part is used to limit the travel of the fourth limiting part along the second direction.

9. The lens device according to claim 5, characterized in that: The base is provided with a first guide portion, and the first displacement member is provided with a second guide portion. The second guide portion is movably disposed on the first guide portion along a first direction, and the first guide portion is used to guide the second guide portion to move along the first direction. And / or, the first displacement member is provided with a third guide portion, the second displacement member is provided with a fourth guide portion, the fourth guide portion is movably disposed on the third guide portion along the second direction, and the third guide portion is used to guide the fourth guide portion to move along the second direction.

10. A projection apparatus, characterized by, include: The lens device as described in any one of claims 1 to 9; An image chip is fixedly disposed relative to the base of the lens assembly. The image chip and the lens of the lens assembly are disposed corresponding to each other along a third direction. The image chip is used to project image light toward the lens.

Images