WO2023201875A1

WO2023201875A1 - Projection lens, projection optical machine and virtual reality device

Info

Publication number: WO2023201875A1
Application number: PCT/CN2022/100947
Authority: WO
Inventors: 张�杰; 陶淑林; 阚立峰
Original assignee: 歌尔光学科技有限公司
Priority date: 2022-04-22
Filing date: 2022-06-24
Publication date: 2023-10-26
Also published as: CN114967029A

Abstract

A projection lens, a projection optical machine and a virtual reality device. The projection lens comprises: a lens barrel (10), a sliding groove (12) being formed in a side wall of the lens barrel (10) in a penetrating manner, and the sliding groove (12) extending in the axial direction of the lens barrel (10); a lens assembly, which is arranged in the lens barrel (10); and an adjusting device (30) located outside the lens barrel (10), the adjusting device (30) comprising a lead screw (31) and a sliding block (32) sleeved on the lead screw (31), wherein the sliding block (32) is in threaded fit with the lead screw (31), the sliding block (32) is connected to the lens assembly by means of a connecting rod (33), the connecting rod (33) can move along the sliding groove (12), and when the lead screw (31) rotates, the lens assembly can be driven to move in the axial direction of the lens barrel (10).

Description

Projection lenses, projection light machines and virtual reality equipment

Technical field

The present disclosure relates to the technical fields of optical electronic products and optical-mechanical structures, and specifically, to a projection lens, a projection optical machine, and a virtual reality device.

Background technique

DLP projector is a new type of projection equipment that has developed rapidly in recent years and can be used in, for example, virtual reality equipment (VR equipment). With the vigorous development of VR technology, users have higher and higher demands for the visual effects of VR equipment. However, users' vision has individual differences. When each user uses a VR product, the clarity of the image will vary with the user's vision. Different imaging clarity will reduce the user's experience.

Contents of the invention

An object of the present disclosure is to provide a new technical solution for a projection lens, a projection light machine, and a virtual reality device.

In a first aspect, in an embodiment of the present disclosure, a projection lens is provided. The projection lens includes:

Lens barrel, the side wall of the lens barrel is provided with a chute, the chute extends along the axial direction of the lens barrel; a lens assembly, the lens assembly is arranged in the lens barrel; and located in the lens barrel An external adjustment device of the lens barrel. The adjustment device includes a lead screw and a slide block that is sleeved on the lead screw. The slide block is threaded with the lead screw. The slide block and the lens assembly are connected through a connecting rod. The connecting rod can move along the chute; when the screw rotates, the lens assembly can be driven to move along the axial direction of the lens barrel. Optionally, the adjustment device is located outside the lens barrel. The adjustment device includes a lead screw and a transmission part. The lead screw and the lens holder are connected through the transmission part; when the lead screw rotates, The transmission part can drive the lens bracket to move.

Optionally, a first limiting structure is provided on the surface of the slider facing the lens barrel, the connecting rod is cooperatively connected with the first limiting structure, and the first limiting structure is at least along the The axial direction of the lens barrel forms a limit for the connecting rod.

Optionally, the lens assembly includes a lens bracket and a lens body, the lens body is fixed in the lens bracket, a mounting structure is provided on the lens bracket, and the connecting rod is connected to the mounting structure.

Optionally, it also includes a fixed bracket, the fixed bracket is provided with a track groove extending in the same direction as the screw; the end of the slide block is located in the track groove, and the track groove is along the edge perpendicular to the The direction of the central axis of the lead screw forms a limit for the slider.

Optionally, a second limiting structure matching the screw is provided at the end of the fixed bracket, and the end of the screw is located in the second limiting structure.

Optionally, a roller is also included, the roller is connected to the screw, the roller is located between the fixed bracket and the slide block, and the roller can drive the screw to rotate.

Optionally, a guide groove is further provided on the inner wall of the lens barrel, and the guide groove extends along the axial direction of the lens barrel.

Optionally, the lens assembly is provided with a guide pin matching the guide groove, and the guide pin can slide along the guide groove.

Optionally, a stop ring is provided at the mouth of the front end of the lens barrel, the stop ring is connected to the inner wall of the lens barrel, and the inner diameter of the stop ring is smaller than the inner diameter of the lens assembly.

In a second aspect, this application provides a projection light machine. The projection light machine includes the projection lens as described above.

In a third aspect, this application provides a virtual reality device. The virtual reality device includes a projection lens as described above.

The beneficial effects of the embodiments of this application are:

The adjusting device is fixed on the lens barrel, and enables the lens bracket and the lens body fixed thereto to be driven by the adjusting device through thread transmission to reciprocate along the axial direction of the lens barrel, thereby changing the diopter of the projection lens. Users with different vision conditions can adjust the diopter of the projection lens according to their own visual needs, so that the projection lens can match the user's vision conditions, thereby increasing the user's experience.

Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Figure 1 is a partial structural schematic diagram of a projection lens in an embodiment of the present disclosure;

Figure 2 is a cross-sectional view of a projection lens in an embodiment of the present disclosure;

Figure 3 is a side view of the lens holder of the projection lens in the embodiment of the present disclosure;

Figure 4 is a schematic structural diagram of a fixed bracket of the projection lens in an embodiment of the present disclosure;

Figure 5 is a schematic structural diagram of the lens barrel of the projection lens in an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a slider of a projection lens in an embodiment of the present disclosure.

Explanation of reference symbols:

10. Lens barrel; 11. Guide groove; 12. Slide groove; 13. Stop ring; 131. Avoidance hole; 14. Slide rail; 20. Lens holder; 21. Installation structure; 22. Guide pin; 23. Support seat ; 24. Lens body; 30. Adjustment device; 31. Lead screw; 32. Slider; 321. First limiting structure; 322. Extension; 33. Connecting rod; 331. Top; 332. Middle part; 333. Bottom ; 334. First step surface; 335. Second step surface; 40. Fixed bracket; 41. First support rod; 411. Second limiting structure; 42. Second support rod; 421. Track groove.

Detailed ways

Embodiments of the present disclosure will be described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present disclosure and are not to be construed as limitations of the present disclosure. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

The terms “first” and “second” features in the description and claims of the present disclosure may explicitly or implicitly include one or more of the features. In the description of the present disclosure, "plurality" means two or more unless otherwise specified.

In the description of the present disclosure, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", " Right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and operation and therefore should not be construed as a limitation on the present disclosure.

In the description of the present disclosure, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood on a case-by-case basis.

According to an embodiment of the present disclosure, a projection lens is provided. The projection lens in this embodiment includes: a lens barrel 10. A stop ring is provided through the side wall of the lens barrel 10. The chute 12 extends along the axial direction of the lens barrel 10;

The lens assembly is arranged in the lens barrel 10; and

The adjustment device 30 is located outside the lens barrel 10. The adjustment device 30 includes a lead screw 31 and a slide block 32 sleeved on the lead screw 31. The slide block 32 is threaded with the lead screw 31. The slide block 32 and the lens assembly are connected through a connecting rod. 33 connection, the connecting rod 33 can move along the chute 12;

When the screw 31 rotates, it can drive the lens assembly to move along the axial direction of the lens barrel 10 .

As shown in FIGS. 1 to 6 , the lens assembly includes a lens bracket 20 and a lens body 24 . The lens body 24 is fixed in the lens holder 20 . A lens holder 20 is set inside the lens barrel 10 , and the lens holder 20 is used to fix the lens body 24 . The adjustment device 30 is connected to the lens barrel 10 and the lens holder 20 respectively. The adjustment device 30 is configured to drive the lens holder 20 to reciprocate along the axial direction of the lens barrel 10 through thread transmission.

As shown in Figures 1-6, the projection lens in the present disclosure can be installed in a virtual reality device. For example, projection lenses can be installed in VR (Virtual Reality) glasses. VR glasses refer to virtual reality head-mounted display devices. The lens barrel 10 is a supporting part that supports the lens holder 20 and the adjustment device 30 . The lens barrel 10 can be fixed on the VR glasses through screw locking. It can also be fixed in other ways, and those skilled in the art can make their own choices.

As shown in FIG. 1 or FIG. 2 , the lens holder 20 is located inside the lens barrel 10 , and the outer wall of the lens holder 20 is slidingly connected to the inner wall of the lens barrel 10 . The lens holder 20 is a supporting part of the lens body 24 and the adjustment device 30 . The lens body 24 is fixedly connected to the lens bracket 20 . When the lens holder 20 slides in the lens barrel 10 , the lens body 24 can be driven to move in the lens barrel 10 along the axial direction of the lens barrel 10 .

As shown in FIG. 1 or FIG. 2 , the adjustment device 30 can move relative to the lens barrel 10 , so that the lens holder 20 is driven by the adjustment device 30 to move along the set trajectory of the adjustment device 30 . The lens body 24 moves together with the lens holder 20 . The adjustment device 30 is a thread transmission device that can convert rotational motion into linear motion, thereby pushing the lens holder 20 to perform linear motion.

In this way, the diopter of the VR glasses can be changed by changing the distance between the lens body 24 and the user's glasses. Users with different vision conditions can adjust the diopter of the projection lens according to their own visual needs, so that the projection lens can match the user's vision conditions, thereby increasing the user's experience.

In addition, the adjustment device 30 in the present disclosure is disposed directly above the lens barrel 10 with a short distance from the lens body 24, and can control the advancement or retreat of the lens body 24 in a short distance, thereby adjusting the diopter of the VR glasses. It can further reduce the size and weight of the glasses.

For example, when the screw 31 rotates, the connecting rod 33 can move along the axial direction of the screw 31 to drive the lens holder 20 to move.

As shown in Figures 1 to 6, the screw 31 rotates under the action of external force. A slide block 32 is mounted on the screw 31 , and the slide block 32 and the screw 31 form a threaded fit. The lead screw 31 extends along the axial direction of the lens barrel 10 . The lens holder 20 is coaxially arranged with the lens barrel 10 . The screw 31 extends along the axial direction of the lens holder 20 .

As shown in FIG. 1 or FIG. 2 , the adjustment device 30 is located outside the lens barrel 10 , and part of the connecting rod 33 passes through the lens barrel 10 and is connected to the lens body 24 . The connecting rod 33 can move relative to the screw 31, thereby driving the lens body 24 connected thereto to move. The lens body 24, the lens barrel 10 and the lens holder 20 are coaxially arranged. When the lens body 24 moves along the axial direction of the lens barrel 10 , the distance between the lens body 24 and the user's eyes changes, thereby changing the diopter of the projection lens.

In this way, the adjustment device 30 does not occupy the light transmission area inside the lens barrel 10 , thereby increasing the area of the light transmission area. Moreover, the adjustment device 30 in the present disclosure has a simple structure, thereby reducing the assembly difficulty of existing VR glasses and reducing the manufacturing cost of VR glasses. At the same time, through thread transmission, more precise guide positioning and more precise stepping distance can be achieved, thereby improving the reliability of the focusing of VR glasses.

As shown in FIGS. 1 , 2 and 5 , the lens barrel 10 is provided with a chute 12 that matches the moving trajectory of the connecting rod 33 , and the connecting rod 33 passes through the chute 12 to be connected to the lens holder 20 . A chute 12 is provided on the side wall of the lens barrel 10 , and the chute 12 allows the connecting rod 33 to pass through. The middle part 332 of the connecting rod 33 is located in the slide groove 12 and is in clearance fit with the slide groove 12 .

The inner diameter of the slide groove 12 matches the diameter width of the transmission part 32 of the connecting rod 33 . The sliding groove 12 extends along the axial direction of the lens barrel 10 . The length of the chute 12 is consistent with the length of the displacement trajectory of the lens assembly lens body 24 in the lens barrel 10 .

In this way, the inner wall of the chute 12 forms a limit on the side wall of the connecting rod 33 , thereby preventing the connecting rod 33 from driving the lens holder 20 to rotate along the axial direction of the lens barrel 10 .

In one example, a stop ring 13 is provided at the mouth of the front end of the lens barrel 10 . The stop ring 13 is connected to the inner wall of the lens barrel 10 . The inner diameter of the stop ring 13 is smaller than the inner diameter of the lens assembly.

In this way, the stop ring 13 forms a stop for the lens holder 20 . This can prevent the lens holder 20 from falling out of the lens barrel 10 during movement, thereby increasing the connection strength of the projection lens.

In one embodiment of the present disclosure, a first limiting structure 321 is provided on the surface of the slider 32 facing the lens barrel 10 . The connecting rod 33 is cooperatively connected with the first limiting structure 321 . The first limiting structure 321 is at least along the The connecting rod 33 is limited in the axial direction of the lens barrel 10 .

As shown in FIGS. 1 , 2 and 6 , the slider 32 extends in a direction perpendicular to the screw 31 , that is, the slider 32 extends in the radial direction of the lens barrel 10 . The slider 32 can linearly move along the extension direction of the screw 31 , that is, along the axial direction of the lens barrel 10 . A first limiting structure 321 is provided on the surface of the slider 32 facing the lens barrel 10 . The first limiting structure 321 may be a limiting hole or a limiting groove. The upper end of the connecting rod 33 is located in the first limiting structure 321 . The first limiting structure 321 limits the connecting rod 33 at least along the moving direction of the lens holder 20, and the extension direction of the screw 31 matches the movement trajectory of the lens holder 20.

In this way, through the cooperation between the screw 31, the slider 32 and the connecting rod 33, the lens holder 20 can be driven to move along the axial direction of the lens barrel 10 through thread transmission, thereby achieving Adjustment of diopter. The projection lens of the present disclosure is simple and improves the reliability of diopter adjustment.

In an example of this disclosure, the lens assembly includes a lens holder 20 and a lens body 24 . The lens body 24 is fixed in the lens holder 20 . A mounting structure 21 is provided on the lens holder 20 , and a connecting rod 33 is connected to the mounting structure 21 .

The connecting rod 33 is detachably connected to the lens holder 20 . For example, as shown in FIG. 2 , the connecting rod 33 is threadedly connected to the lens holder 20 . The connecting rod 33 passes through the lens barrel 10 and is connected to the lens holder 20 through a connecting device. A corresponding mounting structure 21 is provided on the fixed bracket. The mounting structure 21 may be, for example, a mounting groove or a mounting hole. The mounting structure 21 is provided with an internal thread structure, and the outer wall of the connecting rod 33 is provided with an external thread structure corresponding to the thread structure in the mounting structure 21 .

As shown in FIG. 2 , the connecting rod 33 has a stepped structure, and the inner diameter of the connecting rod 33 decreases from the top end of the connecting rod 33 toward the bottom end of the connecting rod 33 . The connecting rod 33 has a first step surface 334 and a second step surface 335 . The first step surface 334 and the second step surface 335 divide the connecting rod 33 into a top 331 , a middle 332 and a bottom 33 . The top 331 is located at the top of the connecting rod 33 , and the bottom 33 is located at the bottom of the connecting rod 33 . The middle portion 332 forms a clearance fit with the lens barrel 10 . The bottom 33 extends into the mounting structure 21 , and the top 331 is located in the first limiting structure 321 . The first limiting structure 321 is opposite to the mounting structure 21 . The second step surface 335 forms a stop with the lens holder 20 so that the bottom 33 of the connecting rod 33 is spaced apart from the bottom surface of the mounting structure 21 . The first step surface 334 forms a stop with the surface of the lens barrel 10 . The inner diameter of the first step surface 334 is larger than the inner diameter of the second step surface 335 .

In this way, the force on the connecting rod 33 can be made more uniform, and the stability of the diopter adjustment can be improved.

In one example, as shown in FIG. 2 , the top 331 , the middle 332 and the bottom 33 of the connecting rod 33 are all cylinders. The top 331, the middle 332 and the bottom 33 of the connecting rod 33 are coaxially arranged. In this way, the structural strength of the connecting rod 33 can be increased, further improving the stability of the diopter adjustment.

In one embodiment of the present disclosure, the projection lens further includes a fixed bracket 40, and the fixed bracket 40 is provided with a track groove 421 extending in the same direction as the lead screw 31;

The end of the slide block 32 is located in the track groove 421 , and the track groove 421 at least limits the slide block 32 in a direction perpendicular to the central axis of the screw 31 .

As shown in FIGS. 1 , 2 , 4 and 6 , the fixed bracket 40 is a supporting part that provides support for the screw 31 and the slider 32 . The fixed bracket 40 can be fixedly connected to the lens barrel 10 or to other structures in the VR glasses, as long as it can provide support for the screw 31 and the slider 32 . The slider 32 includes a body part and an extension part 322. The body part is sleeved on the screw 31 and coupled with the screw 31. The extension portion 322 extends from the main body toward the direction of the fixing bracket 40 . The first limiting structure 321 for limiting the connecting rod 33 is located on the body part or on the extension part 322 . It shall be subject to the needs of those skilled in the art when performing structural design.

As shown in Figure 4, the fixed bracket 40 has an L-shaped structure. The fixed bracket 40 includes a first support rod 41 and a second support rod 42. The starting end of the first support rod 41 is connected to the screw 31, and the second support rod 42 is fixed on The end of the first support rod 41 . The first support rod 41 extends along the second direction and is in the same direction as the extending portion 322 of the slider 32 . The second support rod 42 extends along the first direction. The second support rod 42 and the screw 31 are arranged side by side. The second support rod 42 and the screw 31 extend in the same direction. The first support rod 41 and the second support rod 42 are perpendicular to each other.

As shown in FIGS. 1 , 2 , 4 and 6 , the second support rod 42 is arranged opposite to the extension portion 322 of the slider 32 , and a track groove 421 is provided on the second support rod 42 . The track groove 421 is a linear groove body. The track groove 421 is consistent with the extension direction of the second support rod 42 and the lead screw 31 . For example, the track groove 421 is formed by an opposite surface of the extension portion 322 of the second support rod 42 being recessed in a direction away from the extension portion 322 . The extension portion 322 of the slider 32 is at least partially located in the track groove 421 . The side walls of the track groove 421 form a limit along the axial direction of the lens barrel 10 to prevent the slider 32 from rotating as the screw 31 rotates.

In this way, the slider 32 can be made to move linearly along the axial direction of the lens barrel 10 , and rotation can be converted into linear motion.

As shown in FIG. 4 , the track groove 421 has a convex cross-section, and the projection range of the mouth of the track groove 421 is located within the range of the bottom surface of the track groove 421 . Correspondingly, the end of the extension portion 322 located inside the track groove 421 forms a limiting fit with the track groove 421 .

In this way, the slide block 32 is limited, and the connection strength between the slide block 32 and the track groove 421 is increased.

In one example of the present disclosure, a second limiting structure 411 matching the screw 31 is provided at the end of the fixed bracket 40 , and the end of the screw 31 is located in the second limiting structure 411 .

As shown in FIG. 4 , a second limiting structure 411 is provided at the starting end of the first support rod 41 . The second limiting structure 411 may be a limiting hole or a limiting groove. The end of the screw 31 is located in the second limiting structure 411 , and the screw 31 can rotate relative to the second limiting structure 411 . The second limiting structure 411 forms a limit on one end of the screw 31 to prevent the screw 31 from shaking when it drives the slider 32 .

In this way, the stability of diopter adjustment can be further increased.

In one embodiment of the present disclosure, the projection lens further includes a roller, which is connected to the screw 31 . The roller is located between the fixed bracket 40 and the slider 32 . The roller can drive the screw 31 to rotate.

For example, as shown in Figure 1, the lead screw 31 can be driven electrically or manually. The end of the screw 31 is connected to the drive shaft of the motor, or a roller is provided at the end of the screw 31 , and the end of the screw 31 is at the center of the roller. The roller can rotate with the end of the screw 31 as the center of the circle. By turning the roller by hand, the screw 31 is driven to rotate, so that the lens holder 20 can linearly move forward and backward along the axial direction of the lens barrel 10 .

In this way, the user can drive the roller to rotate by hand, and the roller drives the screw 31 to rotate. In this way, the user can directly adjust the diopter of the projection lens with his hands.

In one example of the present disclosure, a guide groove 11 is also provided on the inner wall of the lens barrel 10 , and the guide groove 11 extends along the axial direction of the lens barrel 10 .

As shown in FIGS. 4 and 5 , the guide groove 11 is formed by the inner wall of the lens barrel 10 being recessed toward the outside. The length of the guide groove 11 matches the length of the movement trajectory of the lens holder 20 . For example, the guide groove 11 is arranged opposite to the mounting structure 21 of the lens holder 20 for limiting the slider 32 . When the mounting structure 21 is located at the top 331 of the projection lens, the guide groove 11 is located at the bottom 33 of the projection lens. The lens holder 20 forms a sliding fit with the guide groove 11 , and the lens holder 20 moves along the extension direction of the guide groove 11 . The length of the guide groove 11 is greater than or equal to the length of the slide groove 12 on the lens barrel 10 .

In this way, the lens holder can be made to move linearly along the axial direction of the lens barrel 10 , thereby preventing the lens holder from rotating or shifting, which may cause distortion of the imaging image.

In one example, there may be a plurality of guide grooves 11 , and adjacent guide grooves 11 are arranged at intervals. The guide grooves 11 extend in the same direction. For example, two parallel guide grooves 11 are provided on the lens barrel 10 , and the lens holder 20 is connected with the guide grooves 11 respectively.

In this way, the force on the lens holder 20 can be more balanced, thereby improving the smoothness and stability of adjusting the diopter.

In one embodiment of the present disclosure, a guide pin 22 matching the guide groove 11 is provided on the lens assembly, and the guide pin 22 can slide along the guide groove 11 .

As shown in Figures 1 to 6, by the guide pin 22 cooperating with the guide groove 11, when the lens holder 20 is driven to move, the lens holder 20 can only move linearly along the axial direction of the lens barrel 10, that is, the lens The bracket 20 has only a single movement tendency. At the same time, the guide pin 22 on the lens holder 20 cooperates with the guide groove 11 to make the force on the lens holder 20 more balanced during movement, further improving the stability and reliability of adjusting the diopter.

In one example, as shown in FIG. 3 , the width of the guide pin 22 is greater than the thickness of the lens holder 20 . As shown in FIG. 6 , the stop ring 13 is provided with an escape hole 131 , and the guide groove 11 penetrates the lens barrel 10 along the thickness direction of the lens barrel 10 . The guide groove 11 is connected with the escape hole 131 . When the guide pin 22 on the lens holder 20 is engaged with the guide groove 11 and the lens holder 20 moves forward, the guide pin 22 moves along the guide groove 11 . When the guide pin 22 is braked to the stop ring 13 , the guide pin 22 is located in the escape hole 131 .

In this way, when the width of the guide pin 22 is greater than the thickness of the lens holder 20 , the movement stability of the lens holder 20 can be increased.

In one example, as shown in FIG. 2 , the guide pin 22 is at a position where the lens holder 20 is opposite to the adjustment device 30 , and the width of the guide pin 22 is greater than the width of the lens holder 20 . The mounting structure 21 is located on the guide pin 22, and the connecting rod 33 is connected with the mounting structure 21. In this way, the connection area between the connecting rod 33 and the lens holder 20 is increased, the stress-bearing area of the lens holder 20 is increased, and the structural strength of the lens holder 20 is improved.

In one example, as shown in FIG. 3 , a support seat 23 is provided on the lens holder 20 at a position opposite to the mounting structure 21 . The support seat 23 is used to connect with the lens barrel 10 to support the lens holder 20 . The support seat 23 extends from the side wall of the lens holder 20 toward the mouth of the distal end of the lens barrel 10 . A slide rail 14 matching the support base 23 is provided on the inner wall of the lens barrel 10 . The support base 23 is cooperatively connected with the slide rail 14. When the lens holder 20 moves relative to the lens barrel 10, the support base 23 can move along the slide rail 14.

In this way, the structural strength of the lens holder 20 can be further increased, and at the same time, it can limit the position of the lens holder 20 . This further prevents the lens holder 20 from shifting during movement.

In one embodiment of the present disclosure, the projection lens further includes a damping structure disposed around the inner wall of the lens barrel 10 , and the damping structure is configured to cover the range of axial movement of the lens holder 20 .

For example, the damping structure is a rubber ring. The damping structure is located between the inner wall of the lens barrel 10 and the outer wall of the lens holder 20 . When the lenses move along the axial direction of the lens barrel 10, the damping structure plays a damping effect. In this way, when the diopter of the projection lens is adjusted, the projection lens has a damping effect, thereby avoiding the problem of focusing lag.

According to another embodiment of the present application, the present application provides a projection light machine. The projection light machine includes the above projection lens.

In addition, the projection light machine also includes components such as a casing, and the projection lens is disposed on the casing, for example.

According to an embodiment of the present disclosure, a virtual reality device is also provided. Virtual reality equipment includes projection lenses as above.

For example, the virtual reality device is VR glasses, and the VR glasses include a body part and the above-mentioned projection lens. There are two projection lenses, and the two projection lenses are arranged oppositely. During actual use, light from the light source passes through the projection lens and is projected onto the user's eyes to form an image. The user can adjust the relative position of the lens body 24 and the eye by driving the screw 31, thereby adjusting the diopter of the lens assembly.

In this way, the situation of being unable to obtain a clear picture due to different vision conditions of different users is avoided. Different users can adjust the diopter according to their own vision conditions to obtain the best visual effects.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like is intended to be incorporated into the description of the implementation. An example or example describes a specific feature, structure, material, or characteristic that is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the disclosure. The scope of the disclosure is defined by the claims and their equivalents.

Claims

A projection lens, characterized by including:

Lens barrel, the side wall of the lens barrel is provided with a chute, and the chute extends along the axial direction of the lens barrel;

a lens assembly, the lens assembly being disposed in the lens barrel; and

An adjustment device located outside the lens barrel. The adjustment device includes a lead screw and a slide block set on the lead screw. The slide block is threaded with the lead screw. The slide block is threaded with the lens assembly. Connected by a connecting rod, the connecting rod can move along the chute;

When the screw rotates, the lens assembly can be driven to move along the axial direction of the lens barrel.
The projection lens according to claim 1, wherein a first limiting structure is provided on the surface of the slider facing the lens barrel, and the connecting rod is cooperatively connected with the first limiting structure, The first limiting structure forms a limiting position on the connecting rod at least along the axial direction of the lens barrel.
The projection lens according to claim 1, wherein the lens assembly includes a lens holder and a lens body, the lens body is fixed in the lens holder, and a mounting structure is provided on the lens holder, The connecting rod is connected to the mounting structure.
The projection lens according to claim 1, further comprising a fixed bracket, the fixed bracket is provided with a track groove extending in the same direction as the lead screw;

The end of the slide block is located in the track groove, and the track groove forms a limit for the slide block in a direction perpendicular to the central axis of the lead screw.
The projection lens according to claim 4, wherein a second limiting structure matching the lead screw is provided at an end of the fixed bracket, and an end of the lead screw is located on the second in the limiting structure.
The projection lens according to claim 5, further comprising a roller, the roller is connected to the screw, the roller is located between the fixed bracket and the slider, and the roller can drive the The screw rotates.
The projection lens according to claim 1, wherein a guide groove is further provided on the inner wall of the lens barrel, and the guide groove extends along the axial direction of the lens barrel.
The projection lens according to claim 7, wherein the lens assembly is provided with a guide pin matching the guide groove, and the guide pin can slide along the guide groove.
The projection lens according to any one of claims 1 to 8, characterized in that a stop ring is provided at the mouth of the front end of the lens barrel, and the stop ring is connected to the inner wall of the lens barrel, so The inner diameter of the stop ring is smaller than the inner diameter of the lens assembly.
A projection light machine, characterized by comprising the projection lens according to any one of claims 1-9.
A virtual reality device, characterized by comprising the projection lens according to any one of claims 1-9.