Optical system and head-mounted display device

Abstract

This disclosure provides an optical system and a head-mounted display device. The optical system includes a support, a piezoelectric actuator, a pre-tensioning component, and two movable components. Each movable component includes a slider and an optical component. The slider is slidably mounted on the support, and the optical component is connected to the slider. The piezoelectric actuator is mounted on one of the movable components and the support, and is used to apply a force to the movable component. The pre-tensioning component is mounted on one of the movable components and the support, and is used to apply a pre-tensioning force between the piezoelectric actuator and the other of the movable component and the support. Under the action of the pre-tensioning component, the coefficient of friction between the piezoelectric actuator and the movable component or the support is 0.02–0.15, and the pre-tensioning force is 0.5 N–10 N. When the piezoelectric actuator is not applying a force, the movable component remains relatively stationary under the action of the pre-tensioning force. When the piezoelectric actuator applies a force, the movable component can move relative to the support.

Description

Technical Field

[0001] This disclosure relates to the field of head-mounted display technology, and in particular to an optical system and a head-mounted display device. Background Technology

[0002] Currently, head-mounted display devices are being used more and more widely. For example, users can use head-mounted display devices for entertainment or work. The optical system is an important component of head-mounted display devices. Utility Model Content

[0003] This disclosure provides an optical system and a head-mounted display device.

[0004] To achieve the above objectives, this disclosure provides the following technical solution:

[0005] According to a first aspect of this application, an optical system is provided, comprising: a support, a piezoelectric actuator, a pre-tensioning component, and two movable components. Each movable component includes: a slider and an optical component. The slider is slidably disposed on the support, and the optical component is connected to the slider. The piezoelectric actuator is disposed on one of the movable components and the support, and is used to apply a force to the movable component. The pre-tensioning component and the piezoelectric actuator are jointly disposed on one of the movable components and the support, and are used to apply a pre-tensioning force between the piezoelectric actuator and the other of the movable component and the support. Under the action of the pre-tensioning component, the coefficient of friction between the piezoelectric actuator and the movable component or the support is 0.02 to 0.15, and the pre-tensioning force is 0.5 N to 10 N. When the piezoelectric actuator is not applying a force, the movable component remains relatively stationary under the action of the pre-tensioning force. When the piezoelectric actuator applies a force, the movable component can move relative to the support.

[0006] According to a second aspect of this application, a head-mounted display device is also provided, including a frame and an optical system, wherein a support for the optical system is disposed on the frame.

[0007] The technical solutions of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0008] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0009] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0010] Figure 1 This diagram illustrates the structure of an optical system provided in an embodiment of the present disclosure.

[0011] Figure 2This diagram illustrates the structure of another optical system provided in an embodiment of the present disclosure;

[0012] Figure 3 This diagram illustrates the structure of yet another optical system provided in an embodiment of the present disclosure;

[0013] Figure 4 A cross-sectional view of a first optical system provided in an embodiment of this disclosure is shown;

[0014] Figure 5 A cross-sectional view of a second optical system provided in an embodiment of this disclosure is shown;

[0015] Figure 6 This diagram shows a cross-sectional view of a third optical system provided in an embodiment of the present disclosure.

[0016] Figure 7 This diagram shows a cross-sectional view of the fourth optical system provided in this embodiment of the present disclosure.

[0017] Figure 8 This diagram shows a cross-sectional view of the fifth optical system provided in this embodiment of the present disclosure.

[0018] Figure 9 This diagram shows a cross-sectional view of a sixth optical system provided in an embodiment of the present disclosure.

[0019] Figure 10 This diagram illustrates a possible mating structure of a slider, a first ball bearing assembly, and a stopper in an optical system provided by an embodiment of the present disclosure.

[0020] Figure 11 This diagram illustrates another mating structure of the slider, first ball assembly, abutment, and third threaded component in the optical system provided in an embodiment of the present disclosure.

[0021] Figure 12 This diagram illustrates a seventh cross-sectional view of the optical system provided in an embodiment of the present disclosure.

[0022] Figure 13 This diagram illustrates an eighth cross-sectional view of the optical system provided in an embodiment of the present disclosure.

[0023] Figure 14 A schematic diagram of a possible optical system provided by an embodiment of this disclosure is shown.

[0024] In the diagram, 1 is the bracket; 11 is the crossbeam; 12 is the slide rail; 121 is the side rail; 122 is the connector; 13 is the cover; 2 is the movable component; 21 is the slider; 211 is the inner body; 212 is the outer body; 213 is the positioning post; 22 is the optical component; 3 is the piezoelectric actuator; 4 is the preload assembly; 41 is the spring; 42 is the first threaded component; 43 is the elastic component; 5 is the friction plate; 6 is the fourth threaded component; 7 is the fifth threaded component; 8 is the first ball assembly; 81 is the retainer; 82 is the ball; 9 is the third threaded component; 10 is the abutment; 110 is the second ball assembly; 120 is the second threaded component; 130 is the fastener; 140 is the gasket; and a is the mounting groove.

[0025] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this disclosure, but are not intended to limit the scope of this disclosure.

[0027] In the description of this disclosure, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0028] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] Exemplary Overview

[0030] Head-mounted displays (HMDs) are also known as head-mounted displays or head-mounted headsets. They are used to achieve augmented reality (AR), virtual reality (VR), and mixed reality (MR) effects. HMDs can take the form of glasses, helmets, etc. In the design of HMDs, interpupillary distance (IPD) adjustment is one of the key technologies for improving the user experience. IPD, the distance between a user's pupils, is crucial to the viewing experience when using a HMD. The main purpose of adjusting the IPD is to ensure that the optical center of the HMD is aligned with the center of the user's pupils, thereby improving wearing comfort and visual effects. Improper IPD adjustment can lead to visual fatigue and an unsatisfactory viewing experience.

[0031] The optical system may include a support 1, a driver, and two movable components 2. The movable components 2 may include optical components 22, through which the user can view the imaging light emitted by the optical system. Both movable components 2 are movably mounted on the support 1. The driver provides power for the movement of the two movable components 2, causing them to move the optical components 22 closer together or further apart. The interpupillary distance of the optical system can be adjusted by adjusting the distance between the two movable components 2. (See reference...) Figure 1 The diagram shown is a structural schematic of an optical system provided in an embodiment of this disclosure. Figure 2 The schematic diagram shown is of another optical system provided in the embodiments of this disclosure, and Figure 3 The diagram shows a structural schematic of another optical system provided in an embodiment of the present disclosure.

[0032] Optionally, the active component 2 may also include an image source component that can provide image information to the optical system. The optical component 22 can adjust the light so that the light is projected onto the eyes of the user wearing the head-mounted display device with the optical system, so that the user can view the image information. Figure 14 The diagram illustrates a possible optical system according to an embodiment of the present disclosure. An image source component is used to emit light capable of forming an image, and an optical component 22 is used to adjust the optical path of the light emitted by the image source component and project the light towards one side of the image source component so that the light can be projected onto the user's eye e, thereby forming an image in the user's eye e.

[0033] In related technologies, the driver uses a motor to drive the movement of two movable components 2. Although the motor can control the movement of the two movable components 2 to adjust the pupil, the motor is relatively heavy, weighing approximately 5g. Moreover, the motor is also relatively large, occupying more than half of the circuit board space. In this embodiment, a piezoelectric driver 3 is selected to provide the power for the movement of the two movable components 2. The piezoelectric driver 3 is lighter and smaller, which is beneficial for realizing a lightweight and miniaturized optical system, thereby realizing a lightweight and miniaturized head-mounted display device.

[0034] In some alternative embodiments, the movable component 2 of the optical system may include a slider 21 and an optical component 22. The slider 21 is slidably disposed on the support 1, the optical component 22 is connected to the slider 21, and a piezoelectric actuator 3 is disposed on one of the movable component 2 and the support 1 for applying a force to the movable component 2, so that the slider 21 can move along the support 1.

[0035] The piezoelectric actuator 3 can be a resonant (or inchworm-type) piezoelectric actuator 3. The resonant piezoelectric actuator 3 utilizes the inverse piezoelectric effect of piezoelectric materials, generating mechanical vibration through deformation of the piezoelectric material under the influence of an electric field. The piezoelectric actuator 3 can include a piezoelectric driving part and a friction mover. The inchworm-type piezoelectric actuator 3 utilizes the inverse piezoelectric effect of the piezoelectric element, that is, when the piezoelectric material is subjected to an electric field, it deforms. By precisely controlling the deformation of the piezoelectric material, two friction movers can be driven to move alternately, thereby achieving continuous and precise displacement output, with a movement similar to the crawling motion of an inchworm or worm in nature. When the resonant piezoelectric actuator 3 is mounted on the slider 21, the resonant piezoelectric actuator 3 can move relative to the support 1, thereby driving the movable component 2 to move. When the resonant piezoelectric actuator 3 is mounted on the support 1, the driving end of the resonant piezoelectric actuator 3 can contact the slider 21, causing the movable component 2 to move relative to the support 1. Piezoelectric actuators 3 can be provided for both movable components 2. Each piezoelectric actuator 3 can be provided on the bracket 1, or on the corresponding movable component 2. Alternatively, some of the piezoelectric actuators 3 can be provided on the bracket 1, and some can be provided on the slider 21 of the corresponding movable component 2.

[0036] In some possible implementations, such as Figure 1 As shown, in the optical system, the piezoelectric actuator 3 is positioned on one side where the two moving components 2 are close to each other, such as... Figure 2 As shown, in the optical system, the piezoelectric actuator 3 is positioned on the side where the two movable components 2 are far apart. Each piezoelectric actuator 3 is used to apply a force to the support 1, thereby driving the corresponding movable component 2 to move along the support 1.

[0037] In some possible implementations, such as Figure 1For example, each movable component 2 may have two sliders 21, which are respectively disposed on both sides of the corresponding optical component 22 along the direction of movement. Both sliders 21 are slidably mounted on the support 1. The movement of the two sliders 21 along the support 1 can drive the entire movable component 2 to translate along the support 1. Each piezoelectric actuator 3 in the optical system may be disposed on two adjacent sliders 21 in the two movable components 2.

[0038] In some possible implementations, such as Figure 3 As shown, in the optical system, piezoelectric actuators 3 are disposed on both sides of each movable component 2 along the direction of movement, and the piezoelectric actuators 3 on both sides of each movable component 2 are used to jointly apply a force to the support 1.

[0039] In some possible implementations, such as Figure 3 As shown, each movable component 2 may have two sliders 21, which are respectively disposed on both sides of the corresponding optical component 22 along the direction of movement. All four sliders 21 are slidably disposed on the bracket 1. The piezoelectric actuators 3 are respectively disposed on the four sliders 21.

[0040] In some possible implementations, the optical system further includes a pre-tensioning component 4, which, along with the piezoelectric actuator 3, is disposed on one of the movable component 2 and the support 1, for applying a pre-tensioning force between the piezoelectric actuator 3 and the other of the movable component 2 and the support 1. When the piezoelectric actuator 3 is not applying a force, the movable component 2 and the support 1 remain relatively stationary under the pre-tensioning force, with a fixed distance between the two movable components 2 and no relative movement. When the piezoelectric actuator 3 applies a force, the movable component 2 can move relative to the support 1.

[0041] In some possible implementations, under the action of the pre-tightening component 4, the coefficient of friction between the piezoelectric actuator 3 and the movable component 2 or the bracket 1 is 0.02 to 0.15, and the pre-tightening force is 0.5 N to 10 N. This ensures that when the optical system is not in use or is accidentally dropped, the movable component 2 can remain stationary relative to the bracket 1 under sufficient friction, and the interpupillary distance of the optical system will not change due to accidental drops of the equipment.

[0042] In some possible implementations, refer to Figure 4 The cross-sectional view of the first optical system provided in this embodiment of the present disclosure is shown. A mounting groove a is provided on one of the support 1 and the movable component 2. Both the pre-tightening component 4 and the piezoelectric actuator 3 are disposed in the mounting groove a. The pre-tightening component 4 elastically abuts against the piezoelectric actuator 3, causing the friction mover of the piezoelectric actuator 3 to abut against either the movable component 2 or the support 1. By providing the mounting groove a, a cavity can be formed to accommodate the piezoelectric actuator 3 and the pre-tightening component 4, and the piezoelectric actuator 3 and the pre-tightening component 4 will not interfere with the placement of other structural components of the optical system.

[0043] Figure 5 This diagram shows a cross-sectional view of a second optical system provided in an embodiment of the present disclosure. The pre-tensioning component 4 includes a spring piece 41, the middle portion of which abuts against the piezoelectric actuator 3. Both ends of the spring piece 41 can be supported inside the mounting groove a, or the ends of the spring piece 41 can be fixed. The middle portion of the spring piece 41 protrudes outwards, elastically abutting against the piezoelectric actuator 3, causing the friction mover at the driving end of the piezoelectric actuator 3 to abut against the movable component 2 or the bracket 1. The mounting groove a can be a blind groove, with the spring piece 41 located on one side of the bottom of the blind groove, and the piezoelectric actuator 3 disposed within the blind groove near the opening.

[0044] In some possible implementations, such as Figure 4 As shown, the preload assembly 4 may include a first threaded member 42 and an elastic member 43. The elastic member 43 is located between the first threaded member 42 and the piezoelectric actuator 3. The first threaded member 42 is used to adjust the preload force. In this embodiment, the mounting groove a provided on one of the bracket 1 and the movable assembly 2 may be a threaded groove. The first threaded member 42 may be threadedly connected to the mounting groove a. By rotating the first threaded member 42, the elastic member 43 can be adjusted to move closer to or further away from the first threaded member 42, thereby adjusting the clamping force between the first threaded member 42 and the elastic member 43, and thus adjusting the preload force between the piezoelectric actuator 3 and the movable assembly 2 or the bracket 1. The threaded groove may include a through threaded groove provided on the first threaded member 42 or the movable assembly 2. The elastic member 43, the piezoelectric actuator 3, and the first threaded member 42 may all be provided in the threaded groove, with the elastic member 43 located between the piezoelectric actuator 3 and the first threaded member 42.

[0045] In some possible implementations, such as Figure 5 As shown, the optical system may further include a friction plate 5. The piezoelectric actuator 3 and the friction plate 5 can be separately disposed on the support 1 and the movable component 2. Under the action of the pre-tightening component 4, the friction mover of the piezoelectric actuator 3 abuts against the friction plate 5. When the surface of the support 1 or the movable component 2 is relatively smooth, the coefficient of friction between the piezoelectric actuator 3 and the movable component 2 is small, resulting in a small force exerted by the piezoelectric actuator 3 on the movable component 2 or the support 1, making it difficult to drive the movable component 2 to translate stably relative to the support 1. In some possible embodiments of this disclosure, a friction plate 5 is provided on the surface of the support 1 or the movable component 2, and the friction mover of the piezoelectric actuator 3 abuts against the friction plate 5. The piezoelectric actuator 3 and the friction plate 5 are in contact and can provide a stable frictional force.

[0046] Figure 6 A cross-sectional structural schematic diagram of a third optical system provided in an embodiment of this disclosure is shown. Figure 7This diagram illustrates a cross-sectional view of a fourth optical system provided in an embodiment of this disclosure. The support 1 may include a crossbeam 11 and a slide rail 12. A groove may be provided on the slide rail 12. A slider 21 has an inner body 211 and an outer body 212. The inner body 211 is slidably connected to the groove, and the outer body 212 is located outside the groove and connected to the inner body 211. The outer body 212 and the optical component 22 can be connected by fasteners 130. The crossbeam 11 can be used to mount on the frame of a head-mounted display device, and the slide rail 12 provides a path for the slider 21 to move along the support 1. The inner body 211 of the slider 21 may be located within the groove and can translate along the support 1. The outer body 212 of the slider 21 extends out of the groove to connect to the optical component 22. In some possible embodiments, such as... Figure 5 As shown, the outer body 212 can be a positioning post 213, and the optical component can include a positioning groove into which the positioning post can be inserted. In some possible embodiments, such as Figure 7 As shown, the outer body 212 has a positioning post 213, which can be inserted into the positioning slot of the optical component 22.

[0047] In some possible implementations, such as Figure 7 As shown, the outer body 212 can protrude from the inner body 211 on both sides to facilitate connection to the optical component 22 via fasteners 130. For example, one end of the fastener 130 can pass through the outer body 212 and be threaded to the optical component 22, while the other end of the fastener 130 is confined to the outer body 212. A positioning post 213 is provided on the outer body 212, and a slot can be provided on the optical component 22. The positioning post 213 can be inserted into the slot, so that the slider 21 and the optical component 22 are in a plane-limited fit.

[0048] In some possible implementation schemes, such as 4 and Figure 5 As shown, when the slide is a strip-shaped groove extending along the length of the crossbeam 11 and running vertically through the crossbeam 11, the inner body 211 of the slider 21 can be contained within the strip-shaped groove. The inner body 211 can be connected to the optical component 22 via a fastener 130. For example, the outer body 212 can be a positioning post 213, inserted into the slot of the optical component 22. One end of the fastener 130 passes through the inner body 211 and is threadedly connected to the optical component 22, while the other end of the fastener 130 is confined to the side of the inner body 211 opposite to the outer body 212.

[0049] Fastener 130 can be a bolt, having a threaded rod and a cap connecting the threaded rod. The threaded rod passes through the internal body 211 and is threaded to the optical component 22, while the cap is positioned on the slider 21. A shim 140 can be placed between the cap and the slider 21. By tightening the bolt, the force between the optical component 22 and the crossbeam 11 can be adjusted, allowing the optical component 22 to contact the crossbeam 11 and achieving a zero-clearance fit between them. The shim 140 makes it easier to control the bolt tightening force. In this embodiment, the bolt tightening force can be between 0.5N and 10N, ensuring a moderate force between the crossbeam 11 and the optical component 22, preventing excessive friction that could cause excessive resistance to the movement of the movable component 2. The tightness between the support 1 (such as the crossbeam 11) and the optical component 22 is moderate, without large gaps, preventing significant wobbling of the optical component 22 relative to the support, and ensuring stable optical performance of the optical system.

[0050] In some possible implementations, such as Figure 6 and Figure 7 As shown, the crossbeam 11 may have a groove, the slide rail 12 may be embedded in the groove, and the inner body 211 of the slider 21 may be accommodated in the groove of the slide rail 12. The crossbeam 11 and the slide rail 12 may be connected by fasteners 130, and the slider 21 and the optical component 22 may be connected by fasteners 130.

[0051] In some possible implementations, such as Figure 6 As shown, the internal body 211 has a mounting groove a, and the piezoelectric actuator 3 is disposed in the mounting groove a, with the friction mover of the piezoelectric actuator 3 abutting against the slide rail 12. The internal body 211 may have a mounting groove a on the side away from the external body 212 (such as the positioning post 213), and the mounting groove a may be a blind groove. Both the preload assembly 4 and the piezoelectric actuator 3 are disposed in the mounting groove a. The preload assembly 4 is located at the bottom of the mounting groove a, while the piezoelectric actuator 3 is located between the preload assembly 4 and the slide rail 12. Under the elastic force of the preload assembly 4, the friction mover of the piezoelectric actuator 3 contacts the slide rail 12.

[0052] Figure 8 A cross-sectional structural schematic diagram of the fifth optical system provided in this disclosure embodiment is shown. Figure 7 and Figure 8 As shown, at least one of the crossbeam 11 and the slide rail 12 is provided with a mounting groove a. The piezoelectric actuator 3 is located in the mounting groove a, and the friction mover of the piezoelectric actuator 3 abuts against the internal body 211. The mounting groove a can be a through groove, with its first port connected to the slide rail and its second port connected to the outside. The piezoelectric actuator 3 and the preload assembly 4 can be mounted on the bracket 1 through the second port. When the piezoelectric actuator 3 is installed in the mounting groove a, the driving end (friction mover) of the piezoelectric actuator 3 contacts the slider 21.

[0053] like Figure 8 As shown, the optical system may also include a cover 13, which can be attached to the crossbeam 11 to cover the first port, and a pretensioning assembly 4 is located between the cover 13 and the piezoelectric actuator 3. The cover 13 serves to limit the piezoelectric actuator 3 on one side and prevent the piezoelectric actuator 3 and the pretensioning assembly 4 from disengaging from the mounting slot a.

[0054] Figure 9 This diagram shows a cross-sectional view of a sixth optical system provided in an embodiment of the present disclosure. The optical system also includes a first ball bearing assembly 8, which is disposed between a support 1 (such as a crossbeam 11) and a slider 21. Each ball 82 of the first ball bearing assembly 8 contacts the slider 21. The first ball bearing assembly 8 can be distributed on one side of the top of the support 1 and located between the support 1 and the slider 21, or it can be located on both sides of the slider 21. The main function of the first ball bearing assembly 8 is to transform the original surface-to-surface sliding friction between the slider 21 and the support 1 into rolling friction between the balls 8 and both the support 1 and the slider 21, significantly reducing the coefficient of friction, decreasing frictional resistance, and also reducing frictional loss between the slider 21 and the support 1. The first ball bearing assembly 8 can be made of ceramic, stainless steel, etc., which has good wear resistance and helps extend its service life.

[0055] In some possible implementations, such as Figure 9 As shown, the optical system also includes a third threaded component 9 and a stop component 10. The first ball assembly 8 is respectively provided on both sides of the slider 21 along the vertical sliding direction. The third threaded component 9 is threaded to the bracket 1. The stop component 10 is located between the third threaded component 9 and the first ball assembly 8. The third threaded component 9 is used to drive the stop component 10 to press the balls 82 of the first ball assembly 8.

[0056] The abutment 10 may include a screw. When the screw is loose, there may be play between the balls 82 of the first ball assembly 8 and the crossbeam 11 or slider 21, which can easily cause the optical component 22 to wobble relative to the bracket 1, affecting the stability of the binocular optical performance of the glasses. When the screw threads are tightened, the force between the first ball assembly 8 and the crossbeam 11 or slider 21 is also greater, increasing the friction between them and requiring a greater driving force for the overall movement structure of the movable component 2. Therefore, in terms of design, the tightening force of the screw needs to be adaptively designed according to the actual situation, and should not be too large or too small. The design of the abutment 10 can reduce the play in directions other than translation along the length of the bracket 1 during the movement of the movable component 2 along the bracket 1, ensuring the stability of the optical system during the pupillary distance adjustment process.

[0057] Figure 10 This diagram illustrates a possible mating structure of the slider 21, the first ball bearing assembly, and the abutment in an optical system provided by an embodiment of the present disclosure. Figure 11This diagram illustrates another mating structure of the slider 21, the first ball assembly, the abutment, and the third threaded member 9 in the optical system provided in this embodiment. The length of the abutment 10 covers a distance not less than the travel of the first ball assembly 8. For example, the bracket 1 may have a groove and a threaded groove connecting the groove, and the abutment 10 may be disposed at the bottom of the groove. The third threaded member 9 is threaded into the threaded groove and abuts against one side of the abutment 10. The balls 82 of the first ball assembly 8 are located on the other side of the abutment 10, with some located within the groove and some protruding from the groove and abutting against the slider 21. The abutment 10 may be made of self-lubricating engineering plastics such as PEEK, POM, or PA. The friction coefficient between the abutment 10 and the balls 82 is low, further reducing the sliding resistance of the movable component 2.

[0058] In some possible implementations, the abutment 10 can be a flat sheet or a block. The flat sheet can contact multiple balls 82 simultaneously. Figure 12 A cross-sectional structural schematic diagram of the seventh optical system provided in this embodiment is shown. The abutment 10 may also include two side plates, one end of which is connected and the other end of which is separated. The two side plates are approximately V-shaped, and each ball 82 of the first ball assembly 8 contacts the inner surface of the two side plates respectively.

[0059] In some possible implementations, such as Figures 9 to 12 As shown, the first ball assembly 8 may include balls 82 and a ball retainer 81, with each ball 82 rotatably mounted in the ball retainer 81. The ball retainer 81 restricts the balls 82 to maintain a certain gap, making the force on the balls 82 more even. The ball retainer 81 can separate the balls 82, reducing friction during contact between the balls 82. When the ball retainer 81 reaches its limit position, it will contact the bracket 1, providing a limit to the limit stroke and preventing the balls 82 from leaking out.

[0060] Figure 13This diagram shows a cross-sectional view of the eighth optical system provided in this embodiment. The optical system also includes a fourth threaded member 6 and a fifth threaded member 7. The slide rail 12 has two side rails 121 and a connecting body 122 connecting the two side rails 121. A groove is formed between the two side rails 121. The fourth threaded member 6 and the fifth threaded member 7 are respectively disposed on both sides of the slide rail 12 and are threadedly connected to the crossbeam 11. The third threaded member 9 and the fourth threaded member 6 respectively abut against the corresponding side rails 121. Tightening either the fourth threaded member 6 or the fifth threaded member 7 can adjust the distance between the two side rails 121. The fourth threaded member 6 and the fifth threaded member 7 are used to apply force to the slide rail 12 to clamp the slider 21, thereby achieving a "zero-gap" fit between the slider 21 and the slide rail 12, preventing the optical component 22 from sliding relative to the support 1 when the piezoelectric actuator is not applying force.

[0061] In some possible implementations, such as Figure 9 As shown, the optical system also includes a second ball bearing assembly 110 and a second threaded component 120. The second ball bearing assembly 110 is disposed between the bracket 1 and the optical component 22. One end of the second threaded component 120 passes through the slider 21 and is threaded to the optical component 22. A shim 140 is disposed between the other end of the second threaded component 120 and the slider 21. Twisting the second threaded component 120 can adjust the distance between the slider 21 and the optical component 22.

[0062] The second ball bearing assembly 110 can be disposed between the bracket 1 and the optical component 22. The second ball bearing assembly 110 can convert the original surface-to-surface sliding friction between the optical component 22 and the bracket 1 into rolling friction, which greatly reduces the coefficient of friction and also reduces the material friction loss caused by sliding friction between the sliding component and the bracket 1.

[0063] like Figure 9 As shown, the second threaded component 120 can fix the slider 21 to the optical component 22. The tension of the second threaded component 120 can be adjusted to regulate the force between the bracket 1 and the slider 21, thereby achieving a zero-clearance fit between the second ball assembly 110 and the bracket 1. When the second threaded component 120 is too loose, there may be play between the balls of the second ball assembly 110 and the bracket 1 or the slider 21, which can easily cause the optical component 22 to wobble relative to the bracket 1, affecting the stability of the binocular optical performance of the optical system. When the second threaded component 120 is too tight, the force between the second ball assembly 110 and the bracket 1 and the optical component 22 is also greater, and the friction between them is also greater, requiring a greater driving force for the overall movement structure of the movable component 2. Therefore, the tightening degree of the second threaded component 120 should not be too large or too small. The function of the shim 140 makes it easier to control the screw tightening force of the second threaded component 120.

[0064] In addition to some exemplary embodiments of this disclosure, a head-mounted display device is also provided, including a frame and an optical system. A support 1 for the optical system is disposed on the frame. By supplying power to the piezoelectric actuator 3 or transmitting control information, the movement of the movable component 2 can be automatically controlled to adjust the interpupillary distance, making operation convenient, meeting the needs of different users, and improving the user experience.

[0065] In some alternative embodiments, the optical system can be housed within the head-mounted display device, allowing for focus adjustment via circuit control. This eliminates the need for knob holes on the surface of the head-mounted display device, resulting in a more integrated and aesthetically pleasing appearance. The absence of knob holes also prevents a reduction in structural strength and enhances the device's waterproof and dustproof performance, thereby improving product quality.

[0066] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. An optical system characterized by comprising: include: support; Two activity components, each of which includes: A slider, which is slidably disposed on the bracket, and An optical component, the optical component being connected to the slider; A piezoelectric actuator, wherein the piezoelectric actuator is disposed on one of the movable component and the support, for applying a force to the movable component; A preload assembly, which is disposed together with the piezoelectric actuator on one of the movable component and the support, for applying a preload force between the piezoelectric actuator and the other of the movable component and the support; Under the action of the pre-tightening component, the coefficient of friction between the piezoelectric actuator and the movable component or bracket is 0.02 to 0.15, and the pre-tightening force is 0.5 N to 10 N. When the piezoelectric actuator is not applying force, the movable component remains relatively stationary with respect to the support under the action of the preload. When the piezoelectric actuator applies a force, the movable component can move relative to the support.

2. The optical system of claim 1, wherein, A mounting slot is provided on one of the bracket and the movable component; Both the pre-tightening component and the piezoelectric actuator are disposed in the mounting slot; The preload component elastically abuts against the piezoelectric actuator, causing the friction mover of the piezoelectric actuator to abut against the movable component or bracket.

3. The optical system of claim 1 or 2, wherein, The pre-tightening component can be configured in any of the following ways: The preload assembly includes a spring sheet, both ends of which are fixed, and the middle part of the spring sheet abuts against the piezoelectric actuator; The preload assembly includes a first threaded component and an elastic component, the elastic component being located between the first threaded component and the piezoelectric actuator, the first threaded component being used to adjust the preload force.

4. The optical system of claim 1 or 2, wherein, Including friction plates; The piezoelectric actuator and the friction plate are respectively disposed on the bracket and the movable component; Under the action of the pre-tightening component, the friction mover of the piezoelectric actuator abuts against the friction plate.

5. The optical system according to claim 1 or 2, wherein, The support includes a crossbeam and a slide rail; The slide rail is fixed to the crossbeam, and a slide groove is provided on the slide rail; The slider has an inner body and an outer body. The inner body is slidably connected to the slide groove, and the outer body is located outside the slide groove and connected to the inner body. The external body and optical components are connected.

6. The optical system according to claim 5, wherein, The pre-tightening component can be configured in any of the following ways: The internal body has a mounting groove, the piezoelectric actuator is disposed in the mounting groove, and the friction mover of the piezoelectric actuator abuts against the slide rail; At least one of the crossbeam and the slide rail is provided with a mounting groove, the piezoelectric actuator is located in the mounting groove, and the friction mover of the piezoelectric actuator abuts against the inner body.

7. The optical system according to claim 1 or 2, wherein, Including the first ball bearing assembly; The first ball bearing assembly is disposed between the bracket and the slider; Each ball of the first ball assembly contacts the slider.

8. The optical system according to claim 1 or 2, wherein, The optical system also includes a second ball bearing assembly and a second threaded component; The second ball bearing assembly is disposed between the bracket and the optical assembly; One end of the second threaded component passes through the slider and is threaded to the optical component, and a gasket is provided between the other end of the second threaded component and the slider. Tightening the second threaded part can adjust the distance between the slider and the optical component.

9. The optical system according to claim 1 or 2, wherein, The optical system can be configured in any of the following ways: The piezoelectric actuators are provided on the side of the two movable components that are close to each other, and the two piezoelectric actuators are used to apply force to the corresponding movable components respectively; The piezoelectric actuators are provided on the sides of the two movable components that are far apart from each other, and the two piezoelectric actuators are used to apply force to the corresponding movable components respectively; Each of the movable components is provided with a piezoelectric actuator on both sides along the direction of movement, and the piezoelectric actuators on both sides of each movable component are used to jointly apply a force to the movable component.

10. A head-mounted display device, characterized in that, include: frame; The optical system as described in any one of claims 1-9, wherein the support of the optical system is disposed on the frame.

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