Optical module, tunable optical system and head-mounted display device

Abstract

The embodiments of the present disclosure disclose an optical module, a tunable optical system and a head-mounted display device. The optical module comprises a support, an output assembly, an image source assembly, a piezoelectric driver and a pre-tightening force. The output assembly is movable relative to the support, the image source assembly is at least partially arranged on the output assembly, the piezoelectric driver and the pre-tightening force are arranged on one of the output assembly and the support, and the pre-tightening force elastically abuts against the piezoelectric driver, so that a driving end of the piezoelectric driver abuts against the other one of the output assembly and the support to generate the pre-tightening force; in a state where the piezoelectric driver does not exert a force, the output assembly and the support remain relatively static under the action of the pre-tightening force; in a state where the piezoelectric driver exerts a force, the output assembly is movable relative to the support to drive the image source assembly to move. The tunable optical system has the optical module, and the head-mounted display device has the tunable optical system.

Description

Technical Field

[0001] This disclosure relates to the field of electronic device technology, and more particularly to an optical module, a focusable optical system, and a head-mounted display device. Background Technology

[0002] Currently, VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality) are attracting more and more users. Users need to wear head-mounted displays to experience these effects. Improving the user experience and meeting the needs of specific groups, such as those with myopia, are important directions for the development of head-mounted display devices. Utility Model Content

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

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

[0005] In a first aspect, embodiments of this application provide an optical module, comprising: a bracket; an output component movable relative to the bracket; an image source component at least partially disposed on the output component; a piezoelectric actuator and a preload member, the piezoelectric actuator and the preload member being disposed on one of the output component and the bracket, and the preload member elastically abutting against the piezoelectric actuator, such that the driving end of the piezoelectric actuator abuts against the other of the output component and the bracket to generate a preload force; when the piezoelectric actuator is not applying a force, the output component and the bracket remain relatively stationary under the action of the preload force; when the piezoelectric actuator applies a force, the output component can move relative to the bracket, driving the image source component to move.

[0006] Secondly, embodiments of this application also provide an adjustable focus optical system, including: the aforementioned optical module and optical components, wherein the output component of the optical module drives the image source component to move, thereby adjusting the distance between the image source component and the optical component; wherein the light emitted by the image source component can be projected onto the optical component, and the optical component can adjust the optical path of the light emitted by the image source component.

[0007] Thirdly, embodiments of this application provide a head-mounted display device, including: a frame; and the aforementioned adjustable optical system, wherein the adjustable optical system is disposed on the frame.

[0008] The technical solutions of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0009] 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.

[0010] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0011] Figure 1 This diagram illustrates the structure of a first type of head-mounted display device provided in an embodiment of the present disclosure;

[0012] Figure 2 This diagram illustrates the structure of a second type of head-mounted display device provided in an embodiment of the present disclosure;

[0013] Figure 3 This diagram illustrates the structure of a third type of head-mounted display device provided in an embodiment of the present disclosure.

[0014] Figure 4 This diagram illustrates the cooperative structure of the output component, columnar structure, and guide post in the head-mounted display device provided in this embodiment of the present disclosure.

[0015] Figure 5 This diagram illustrates the structure of a fourth type of head-mounted display device provided in an embodiment of the present disclosure;

[0016] Figure 6 A schematic diagram of an adjustable focus optical system provided in an embodiment of this disclosure is shown.

[0017] In the diagram, 1. Bracket; 11. Upper bracket; 111. Crossbeam; 1111. Mounting hole; 112. Mounting bracket; 1121. Clearance hole; 12. Lower bracket; 121. Clearance groove; a. Columnar structure; 2. Output assembly; 21. Mounting assembly; 21a. Mating part; 21b. Limiting body; 22. Sliding assembly; 23. Body part; 24. Drive mating part; 241. Friction plate; 25. Guide hole; 3. Piezoelectric actuator; 31. Housing; 4. Preload; b. Guide groove; 5. Image source assembly; 51. Display component; 52. Lens; 6. PCB circuit board; 7. Ranging component; 8. Ranging mating part; 9. Optical assembly; 91. Beam splitter; 92. Reflector; c. Eye; d. Guide post.

[0018] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model 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 utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, 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. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly 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 utility model based on the specific circumstances.

[0022] Exemplary Overview

[0023] Head-mounted display devices, also known as head-mounted displays (HMDs) or head-mounted displays, can be used to achieve augmented reality (AR), virtual reality (VR), and mixed reality (MR) effects. They can take the form of glasses, helmets, etc. In a head-mounted display device, the image source component 5 provides image information, and the optical component 9 adjusts the light so that it is projected onto the user's eyes (c), allowing the user to view the image information. Figure 6 The diagram shows the optical system of a head-mounted display device. The image source component 5 is used to emit light that can form an image, and the optical component 9 is used to adjust the optical path of the light emitted by the image source component 5 and project the light towards the first side of the image source component 5 so that when the glasses are worn on the user's head, the light can be projected into the user's eyes c, thereby forming an image in the user's eyes c.

[0024] Exemplary Structure

[0025] Figure 1 A schematic diagram of the structure of a first type of head-mounted display device provided in an embodiment of this disclosure is shown. Figure 2 This diagram illustrates the structure of a second type of head-mounted display device provided in an embodiment of this disclosure. In some optional embodiments of this disclosure, the optical module may include: a support 1, a driving component, and an image source component 5, wherein the image source component 5 is at least partially movable relative to the support 1. The driving component provides the power for moving the image source component 5, enabling the image source component 5 to move relative to the support 1.

[0026] In some possible implementations, the optical module may include an output component 2, with an image source component 5 at least partially disposed on the output component 2, and movement of the output component 2 causing movement of the image source component 5. The driving component may include a piezoelectric actuator 3, which provides power for the movement of the output component 2.

[0027] Understandably, various types of drivers exist on the market, such as SMA shape memory alloy motors, VCM voice coil motors, and stepper motors. Considering factors such as optical stability, size, weight, and driving voltage, experimental verification has shown that piezoelectric driver 3 is more suitable as a driver for head-mounted display devices. Furthermore, piezoelectric driver 3 possesses excellent motion resolution, achieving an accuracy level of 10nm to 100nm, while ordinary stepper motors can only achieve an accuracy of 1 to 10μm. Therefore, piezoelectric driver 3 is more suitable for compact head-mounted display devices.

[0028] The piezoelectric actuator 3 can be a resonant (or inchworm-type) piezoelectric actuator. The resonant piezoelectric actuator 3 utilizes the inverse piezoelectric effect of the piezoelectric material, generating mechanical vibration through deformation of the piezoelectric material under the influence of an electric field. When the resonant piezoelectric actuator 3 is mounted on the support 1, it can drive the output component 2 to move relative to the support 1. When the resonant piezoelectric actuator 3 is mounted on the output component 2, it can move along the support 1, thereby driving the output component 2 to move. The resonant piezoelectric actuator 3 can provide a large torque output at low speeds, smoothly driving or propelling the output component 2, on which the image source component 5 is mounted, to move.

[0029] In an alternative example, the resonant piezoelectric actuator 3 can be a single-point drive or a multi-point drive, which can effectively drive or move the output component 2 up and down relative to the bracket 1.

[0030] In one alternative example, the resonant piezoelectric actuator 3 can achieve a driving force of over 10 gf, a movement speed greater than 10 mm / s, and a driving voltage less than 3.3 V. This resonant piezoelectric actuator 3 has a low driving voltage, low power supply requirements, high safety, can provide a large torque output, and has a fast response speed, enabling it to smoothly drive the image source component 5 to move.

[0031] In an optional example, the optical module may include a preload element 4, and the piezoelectric actuator 3 and the preload element 4 may be disposed on one of the output component 2 and the bracket 1. The preload element 4 can elastically abut against the piezoelectric actuator 3, causing the driving end of the piezoelectric actuator 3 to abut against the other of the output component 2 and the bracket 1 to generate a preload force. When the piezoelectric actuator 3 is not under force, the output component 2 and the bracket 1 can remain relatively stationary under the action of the preload force. When the piezoelectric actuator 3 is under force, the output component 2 can move relative to the bracket 1, driving the image source component 5 to move.

[0032] During the process of the optical module being subjected to external impact, the preload 4 remains pressed against the piezoelectric actuator 3, causing the drive end of the piezoelectric actuator 3 to press against the output component 2 or the bracket 1. The preload 4 generates a preload force, which keeps the output component 2 relatively stationary with respect to the bracket 1, preventing the output component 2 from sliding relative to the bracket 1. During the "creeping" process of the piezoelectric actuator 3, the preload force applied by the preload 4 provides friction between the piezoelectric actuator 3 and the bracket 1 or the output component 2, propelling it up and down. It is understood that the preload 4 can be of various structural components; for example, the preload 4 can be a helical elastic element such as a spring.

[0033] In some optional embodiments, the weight of the image source component 5 disposed on the output component 2 can be approximately 2g to 5g, the coefficient of friction between the piezoelectric actuator 3 and one of the output component 2 and the support 1 is approximately 0.1 to 0.3, and the preload applied by the preload member 4 is 30gf to 500gf. This ensures that the friction between the piezoelectric actuator 3 and the output component 2 or the support 1 is large enough to keep the position of the output component 2 in the head-mounted display device unchanged, and that the parameters such as the focal length of the head-mounted display device remain unchanged after adjustment.

[0034] Taking a head-mounted display device worn at a height 1.5m above the ground as an example, at the instant the head-mounted display device accidentally falls and stops upon contact with the ground, the acceleration of the image source component 5 is approximately 10 times the acceleration due to gravity. Therefore, the image source component 5 needs to be subjected to a frictional force of 20gf to 50gf to maintain its position, that is, its position relative to the bracket 1 remains unchanged. Thus, when the pre-tightening force of the pre-tightening component 4 is in the range of 30gf to 500gf, it is sufficient to ensure that the output component 2 can be subjected to sufficient frictional force to maintain its position when the head-mounted display device is accidentally dropped, and the focal length of the head-mounted display device will not change due to the accidental drop of the device.

[0035] In an optional example, such as Figure 1As shown, the bracket 1 has a columnar structure a, a preload 4 and a piezoelectric actuator 3 are disposed on the output assembly 2, the preload 4 elastically abuts against the piezoelectric actuator 3, so that the driving end of the piezoelectric actuator 3 abuts against the columnar structure a. Under the action of voltage, the piezoelectric actuator 3 can move linearly along the columnar structure a, and drive the output assembly 2 to move. Optionally, the columnar structure a and the bracket 1 are connected to form an integral unit, or the columnar structure a is fixed to the bracket 1 by fasteners, by a snap-fit ​​structure or by an adhesive structure.

[0036] In an optional example, the output component 2 may include a sliding component 22 connected to the image source component 5. After a voltage is applied to the piezoelectric actuator 3, the driving end of the piezoelectric actuator 3 generates mechanical vibration, which can actively move along the columnar structure a, thereby driving the sliding component 22 to move, and in turn driving the image source component 5 to move.

[0037] In an optional example, such as Figure 1 As shown, the output component 2 may include a sliding component 22 and a mounting component 21. The sliding component 22 is connected to the image source component 5, and the mounting component 21 is slidably connected to the columnar structure a. The sliding component 22 and the mounting component 21 can be connected by fasteners, snap-fit ​​structures, or adhesive structures, or the sliding component 22 and the mounting component 21 can be integrally formed. The preload 4 and the piezoelectric actuator 3 are both disposed on the mounting component 21. Under the elastic force of the preload 4, the driving end of the piezoelectric actuator 3 abuts against the columnar structure a, and the piezoelectric actuator 3 can move along the columnar structure a to drive the sliding component 22 to move.

[0038] In an optional example, such as Figure 1 As shown, the mounting assembly 21 may include two mating portions 21a and a limiting body 21b connecting the two mating portions 21a. The limiting body 21b is connected to the sliding assembly 22. The two mating portions 21a are arranged in the movable direction of the image source assembly 5, and the columnar structure a passes through the two mating portions 21a. In the movable direction of the image source assembly 5, the piezoelectric actuator 3 is disposed between the two mating portions 21a. In a direction perpendicular to the movable direction of the image source assembly 5, the columnar structure a is located between the limiting body 21b and the piezoelectric actuator 3. Optionally, the preload member 4 may be an elastic member, with both ends supported on the two mating portions 21a, and its middle portion bulging outward and elastically abutting against the piezoelectric actuator 3, so that the driving end of the piezoelectric actuator 3 can abut against the columnar structure a.

[0039] The frictional force between the columnar structure a and the piezoelectric actuator 3 is not less than the weight of the output component. When the piezoelectric actuator 3 is not energized, the output component 2 and the image source component 5 are relatively fixed in position and will not slide down along the columnar structure a.

[0040] In an optional example, the columnar structure a can be a prism with a polygonal cross-section. The columnar structure a can have multiple planes around its perimeter, with edges forming between adjacent planes. The driving end of the resonant piezoelectric actuator 3 can act on one of these planes. The output component 2 has a polygonal guide groove through which the columnar structure a passes. The columnar structure a restricts the output component 2 to move only along the length of the columnar structure a, preventing rotation around it, thus ensuring that the driving end of the resonant piezoelectric actuator 3 abuts against the corresponding plane.

[0041] In an optional example, such as Figure 1 As shown, the image source component 5 includes at least one of a display component 51 and a lens 52. At least one of the display component 51 and the lens 52 is connected to the output component 2. Exemplarily, the display component 51 and the lens 52 may both be disposed on the output component 2, for example, the display component 51 and the lens 52 may be disposed on opposite sides of the output component 2 along its thickness direction. A clearance opening is provided on the output component 2, allowing light emitted from the display component 51 to enter the lens 52 through the clearance opening.

[0042] In an optional example, a display component 51 and a lens 52 can be respectively disposed on both sides of the output component 2 along the thickness direction, and the display component 51, lens 52 and output component 2 are fixedly connected to form a single unit. Moving the output component 2 can simultaneously move the display component 51 and the lens 52.

[0043] In an optional example, the display component 51 is disposed on the output component 2, while the lens 52 may be disposed on the bracket 1. The bracket 1 may include an upper bracket 11 and a lower bracket 12 connected to each other. A columnar structure a is disposed on the upper bracket 11, the output component 2 is located between the upper bracket 11 and the lower bracket 12, and the lens 52 is disposed on the lower bracket 12.

[0044] In an optional example, display component 51 can be used to emit light for displaying an image. Display component 51 may include, but is not limited to, an organic light-emitting diode (OLED) image source, a liquid crystal image source, a liquid crystal on silicon (LCOS) image source, a microelectromechanical system (MEMS) image source, a digital micromirror device (DMD), etc. For example, display component 51 can be an OLED display screen.

[0045] Lens 52 can be an aspherical lens 52, which can correct field curvature, pupil swim, and chromatic aberration to ensure the imaging quality of the optical system.

[0046] Figure 3 This diagram illustrates the structure of a third type of head-mounted display device provided in an embodiment of the present disclosure. Figure 5 This diagram illustrates the structure of a fourth type of head-mounted display device provided in an embodiment of the present disclosure. One end of the output component 2 may have a drive engagement portion 24. The piezoelectric actuator 3 and the preload 4 are mounted on the bracket 1. The preload 4 elastically abuts against the piezoelectric actuator 3, causing the drive end of the piezoelectric actuator 3 to abut against the drive engagement portion 24, thereby driving the output component 2 to move.

[0047] The piezoelectric actuator 3 is fixed on the bracket 1. The elastic force (or preload) applied by the preload member 4 can ensure that the structure can resist the inertial force of the output component 2 when subjected to external impact, so as not to cause the output component 2 to slip off.

[0048] During the process of the optical module being subjected to external impact, the preload 4 can maintain elasticity against the piezoelectric actuator 3, so that the driving end of the piezoelectric actuator 3 abuts against the output component 2. The preload force between the piezoelectric actuator 3 and the output component 2 can keep the output component 2 relatively stationary with respect to the bracket 1, and the output component 2 will not slide relative to the bracket 1. During the "creeping" process of the piezoelectric actuator 3, the preload 4 elastically abuts against the piezoelectric actuator 3, so that sufficient friction is generated between the piezoelectric actuator 3 and the driving engagement part 24 of the output component 2, so that the piezoelectric actuator 3 can push the driving engagement part 24 to move up and down.

[0049] In an optional example, such as Figure 3 and Figure 5 As shown, the output assembly 2 has a body portion 23. The image source assembly 5 is at least partially disposed on the body portion 23, and the drive engagement portion 24 can be connected to the body portion 23. In the moving direction of the output assembly 2, the extension dimension of the drive engagement portion 24 can be greater than the extension dimension of the body portion 23.

[0050] Optionally, the main body 23 can be generally plate-shaped, and the extension dimension of the drive mating part 24 along the thickness direction of the plate can be greater than the extension dimension of the main body 23, thereby increasing the length of contact between the output component 2 and the piezoelectric actuator 3. Optionally, the drive mating part 24 can be integrally formed with the main body 23, resulting in high overall structural strength, resistance to deformation, and no impact on imaging quality.

[0051] In an optional example, such as Figure 5 As shown, the drive mating part 24 can be a columnar structure a, and one of the housing 31 of the piezoelectric actuator 3 and the bracket 1 is provided with a guide groove b, and the columnar structure a is slidably connected to the guide groove b.

[0052] like Figure 5 As shown, a clearance groove 121 can be provided on the lower support 12 of the bracket 1 corresponding to the columnar structure a. During the downward movement of the driving mating part 24, the bottom end of the columnar structure a can slide into the clearance groove 121. During the upward movement of the driving mating part 24, the bottom end of the columnar structure a can slide out of the clearance groove 121.

[0053] Optionally, the columnar structure a can be a prism with a polygonal cross-section. The columnar structure a can have multiple planes around its perimeter, with edges forming between adjacent planes. The driving end of the piezoelectric actuator 3 can act on one of these planes. The bracket 1 or housing 31 can have a polygonal guide groove b that matches the columnar structure a. The columnar structure a passes through the guide groove b, which restricts the columnar structure a to move only along its length and prevents it from rotating around the guide groove, ensuring that the driving end of the piezoelectric actuator 3 remains abutted against the corresponding plane of the columnar structure a.

[0054] In an optional example, such as Figure 3 As shown, the drive mating part 24 has a guide groove b, and the bracket 1 has a columnar structure a, which is inserted into the guide groove b. The columnar structure a and the guide groove b cooperate to restrict the movement direction of the output component 2. The drive mating part 24 has a large cross-sectional area, providing sufficient space to set the guide groove b.

[0055] In some alternative embodiments, such as Figure 4 As shown, the columnar structure a can be a cylindrical shaft, while the guide groove b can be a circular hole, with the outer diameter of the cylindrical shaft not exceeding the inner diameter of the circular hole. In some alternative embodiments, the columnar structure a can also be a prism. When the columnar structure a is a prism, it can have multiple planes around its circumference, with edges forming between adjacent planes, and the cross-section of the guide groove b matches that of the columnar structure a. The columnar structure a and the guide groove b are in a limiting fit, with the guide groove b restricting the columnar structure a to move only along its length and preventing it from rotating around the guide groove.

[0056] In some optional examples, such as Figure 4 and Figure 5As shown, the optical module may also include a guide post d, which can be fixedly connected to the bracket 1. The extension direction of the guide post d is parallel to that of the columnar structure a. A guide hole 25 can be provided on the output component 2. The guide hole 25 and the guide groove b can be arranged sequentially along the length or width direction of the output component 2. The guide post d can pass through the guide hole 25 on the output component 2. The guide post d and the columnar structure a cooperate to restrict the movement of the output component 2, restricting the output component 2 to move only along the length direction of the columnar structure a. When the optical module is applied to a head-mounted display device, the guide post d and the columnar structure a cooperate to restrict the output component 2 to move only along the height direction of the head-mounted display device. The two ends of the output component 23 along the length or width direction are respectively guided and engaged with the guide post d and the columnar structure a, so that the output component 2 can rise and fall smoothly under the action of the piezoelectric actuator 3, and the two ends are not prone to skew. The guide hole 25 can be a circular hole, and the guide post d can be a cylindrical shaft. The guide post d passes through the guide hole 25, and the inner wall of the guide post d and the guide hole 25 are in contact. The contact surfaces of the guide post d and the guide hole 25 are smooth, which reduces friction. The guide hole 25 can also be a strip-shaped hole, such as an elliptical hole, and its shape can resemble a capsule. The cross-sectional area of ​​the guide hole 25 is much larger than that of the guide post d, thereby reducing the resistance between the guide post d and the output component 2, preventing the output component 2 from being slightly misaligned and jammed, and allowing the output component 2 to move up and down smoothly.

[0057] It should be noted that the height direction of the head-mounted display device mentioned in the text can be understood as... Figure 1 The direction indicated by the middle arrow H. Figure 1 The arrow L in the diagram indicates the length direction of the head-mounted display device.

[0058] In an optional example, such as Figure 3 and Figure 4 As shown, a friction plate 241 is provided on the drive mating part 24, and the drive end of the piezoelectric actuator 3 can abut against the friction plate 241. The friction plate 241 can be connected to the drive mating part 24 by snap-fitting, bonding, or fasteners. The friction plate 241 can be made of a material with a relatively high coefficient of friction. Under the action of the preload 4, the piezoelectric actuator 3 can elastically abut against the friction plate 241. The friction between the piezoelectric actuator 3 and the friction plate 241 is relatively large, which can adaptively reduce the driving force requirement of the piezoelectric actuator 3, that is, reduce the requirements of the piezoelectric actuator 3, which is conducive to reducing costs.

[0059] Figure 6 A schematic diagram of an adjustable-focus optical system provided in an embodiment of this disclosure is shown. (In conjunction with...) Figure 1 and Figure 6As shown, the adjustable-focus optical system includes: the aforementioned optical module and optical component 9. The output component 2 of the optical module drives the image source component 5 to move, thereby adjusting the distance between the image source component 5 and the optical component 9, i.e., adjusting the focal length. The light emitted by the image source component 5 can be projected onto the optical component 9, and the optical component 9 can adjust the optical path of the light emitted by the image source component 5.

[0060] Optical components 9 and optical modules are arranged sequentially along the length of columnar structure a, with the optical module positioned above optical component 9. Optical component 9 is fixed to bracket 1 and its relative position to bracket 1 is fixed; it does not move relative to bracket 1. Only the output component 2, which houses image source component 5, can move linearly under the action of piezoelectric actuator 3. Image source component 5 emits light capable of forming an image, and optical component 9 adjusts the optical path of the light emitted by image source component 5, projecting the light towards the first side of image source component 5 so that when the glasses are worn on the user's head, the light can be projected into the user's eye c, thereby forming an image in the user's eye.

[0061] In an optional example, such as Figure 6 As shown, the optical component 9 may include a beam splitter 91 and a reflector 92. The image source component 5 can project light in a vertical direction. The beam splitter 91 reflects the light emitted by the image source component 5 and projects the light into the second direction, which is then incident on the reflector 92. The reflector 92 reflects the light projected by the beam splitter 91 and projects the light into the first direction. The light can pass through the beam splitter 91 and, when the user wears glasses, is projected into the user's eye c, thereby forming a virtual image in the user's field of vision. Focusing can be achieved by adjusting the lifting and lowering movement of the image source component 5, moving it closer to or further away from the beam splitter 91.

[0062] Some exemplary embodiments of this disclosure also provide a head-mounted display device, including: a frame and the aforementioned adjustable optical system, the adjustable optical system being disposed on the frame.

[0063] The head-mounted display device is equipped with an adjustable optical system. By powering on or off the piezoelectric driver 3, the image source component 5 can be moved to adjust the focus automatically. The operation is relatively convenient and meets the user experience of users with different vision conditions such as myopia and hyperopia.

[0064] In an alternative example, the adjustable-focus optical system can be integrated within the head-mounted display device, allowing for focus adjustment via circuitry. This eliminates the need for knobs on the surface of the head-mounted display, resulting in a more seamless and aesthetically pleasing design. The absence of knobs also prevents a reduction in structural strength and enhances the device's waterproof and dustproof performance, thereby improving product quality.

[0065] In an optional example, the head-mounted display device may include a frame and temples connecting to the frame. The upper support 11 of the bracket 1 may be disposed within the frame, and the crossbeam 111 extends along the width of the frame. The head-mounted display device may include two adjustable optical systems, each connected to the upper support 11. The upper support 11 may include the crossbeam 111 and a mounting frame 112. Both the mounting frame 112 and the crossbeam 111 are long beams. The mounting frame 112 can be connected to the crossbeam 111 by any of the following methods: fastener fixation, snap-fit ​​fixation, or adhesive fixation. The adjustable optical systems are mounted on the mounting frame 112. The upper support 11 may also be a single, integrated structure.

[0066] In an optional example, such as Figure 1 As shown, the head-mounted display device may further include a ranging component 7 and a ranging mating component 8. The ranging component 7 is disposed on either the crossbeam 111 or the mounting bracket 112, and the ranging mating component 8 is disposed on the output component 2. The ranging component 7 is used to detect the distance between itself and the ranging mating component 8. The ranging component 7 can be a TMR sensor, a Hall sensor, etc. A PCB circuit board 6 can be disposed on the crossbeam 111, and the ranging component 7 is electrically connected to the PCB circuit board 6.

[0067] In an optional example, to reduce the distance between the ranging component 7 and the ranging mating component 8, thereby improving ranging accuracy. For example... Figure 1 As shown, the head-mounted display device can have a clearance hole 1121 on the mounting frame 112, and a mounting hole 1111 on the side of the crossbeam 111 near the mounting frame 112. A ranging component 7 can be installed within the mounting hole 1111, and a ranging mating component 8 is connected to the output component 2. The ranging mating component 8 can pass through the clearance hole 1121 and extend into the mounting hole 1111, thereby reducing the distance between the ranging component 7 and the ranging mating component 8 and improving ranging accuracy. Through this structural design, the minimum distance between the ranging component 7 and the ranging mating component 8 can be controlled between 0.1mm and 1mm.

[0068] In an optional example, the head-mounted display device can employ a piezoelectric actuator 3 and a ranging component 7 to achieve closed-loop control of the focusing degree. Since the assembly positions of the ranging component 7 and the ranging mating part 8 vary between each head-mounted display device, the output voltage measured by the ranging component 7 can be calibrated against the focusing degree. The voltage output by the ranging component 7 exhibits good linearity with the distance between the ranging component 7 and the ranging mating part 8, and the distance deviation between the ranging component 7 and the ranging mating part 8 also shows a good linear relationship with the focusing degree. Therefore, it can be considered that the output voltage of the ranging component 7 is essentially linear with the focusing degree. Based on the calibration results, the output component 2 is moved to a specific position via the piezoelectric actuator 3, which also changes the relative position between the ranging component 7 and the ranging mating part 8. The output voltage of the ranging component 7 is then tested again. If a deviation is found, the position is fine-tuned again, thus achieving closed-loop control of the focusing degree.

[0069] The head-mounted display device provided in this embodiment of the present disclosure, through an adjustable focusing optical system, and in conjunction with sensors and control logic, enables users to quantitatively set the diopter, and the head-mounted display device automatically adjusts to the corresponding diopter. This avoids the problem of manual focusing, where the diopter cannot be quantitatively set and users can only set the diopter through actual optical perception.

[0070] The above description has been provided for illustrative and descriptive purposes. The above embodiments are merely preferred embodiments of this application, and the technical features described in each of the above embodiments can be used individually. Features of the different embodiments described above can be freely combined without structural contradictions or logical conflicts, and the resulting technical solutions, whether or not explicitly listed in the specification, should be included within the scope of protection of this invention. Furthermore, the above description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although several 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 module, comprising: support; An output component, the output component being movable relative to the support; Image source component, said image source component being at least partially disposed in output component; The piezoelectric actuator and the preload are disposed on one of the output assembly and the bracket, and the preload elastically abuts against the piezoelectric actuator, such that the driving end of the piezoelectric actuator abuts against the other of the output assembly and the bracket to generate a preload force. When no force is applied by the piezoelectric actuator, the output component and the support remain relatively stationary under the action of the preload. When the piezoelectric actuator applies a force, the output component can move relative to the support, thereby moving the image source component.

2. The optical module according to claim 1, wherein The support has a columnar structure; The preload and piezoelectric actuator are located in the output assembly. The preload elastically abuts against the piezoelectric actuator, causing the drive end of the piezoelectric actuator to abut against the columnar structure. Under the influence of voltage, the piezoelectric actuator can move linearly along the columnar structure and drive the output component to move.

3. The optical module according to claim 2, wherein The output components include a sliding component and a mounting component, with the sliding component connected to the image source component; The mounting components can be slidably attached to the columnar structure; Both the preload and the piezoelectric actuator are located in the mounting assembly; The preload presses the drive end of the piezoelectric actuator against the columnar structure, allowing the piezoelectric actuator to move along the columnar structure and thus move the sliding assembly.

4. The optical module according to claim 1, wherein One end of the output component has a drive engagement part; The piezoelectric actuator and the preload are mounted on the bracket. The preload elastically abuts against the piezoelectric actuator, so that the driving end of the piezoelectric actuator abuts against the driving mating part to drive the output component to move.

5. The optical module according to claim 4, wherein, The output component has a body section; The source component is at least partially disposed in the body section; The drive assembly is connected to the main body. Along the moving direction of the output component, the extension dimension of the drive mating part is larger than that of the body part.

6. The optical module according to claim 4, wherein, The drive mating part has a columnar structure, and a guide groove is provided in one of the housing and bracket of the piezoelectric actuator; The columnar structure is slidably connected to the guide groove.

7. The optical module according to claim 4, wherein, The drive mating part is provided with a guide groove; The support has a columnar structure; The columnar structure is inserted into the guide groove, and the columnar structure and the guide groove work together to restrict the movement direction of the output component.

8. The optical module according to any one of claims 4-7, wherein, Friction plates are provided on the drive mating part; The driving end of the piezoelectric actuator abuts against the friction plate.

9. A focusing optical system, comprising: The optical module as described in any one of claims 1-8; Optical components, the output components of the optical module drive the image source component to move, so as to adjust the distance between the image source component and the optical components; Among them, the light emitted by the image source component can be projected onto the optical component, and the optical component can adjust the optical path of the light emitted by the image source component.

10. A head-mounted display device, comprising: frame; The adjustable focusing optical system of claim 9, wherein the adjustable focusing optical system is disposed on the frame.

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