Optical system and intelligent head-mounted device

Abstract

The embodiment of the invention provides an optical system and intelligent head-mounted equipment. The optical system comprises a lens module, a screen module, a rotating ring, a motor and a driving gear; wherein the screen module and the lens module are arranged along the same optical axis; gear teeth are arranged on the outer side of the rotating ring in the circumferential direction, and the rotating ring is arranged between the lens module and the screen module and is in threaded connection with the screen module to form transmission fit; the motor is arranged on the lens module and is connected with the driving gear, and the driving gear is meshed with the gear teeth of the rotating ring; under the driving of the motor, the driving gear can drive the rotating ring to rotate, and the rotating ring can form threaded transmission with the screen module after rotating, so that the screen module can move relative to the lens module in the direction of the optical axis.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical display technology. More specifically, the embodiments of the present application relate to an optical system and an intelligent head-mounted device. Background Art

[0002] VR glasses are a kind of virtual reality head-mounted display device, which is a combination of simulation technology, computer graphics human-computer interface technology, multimedia technology, sensor technology, network interaction technology and other technologies. It allows users to experience the real virtual world and has been applied in many fields such as games, movies, live broadcasts, e-commerce, education, fitness, urban planning, tourism, etc.

[0003] However, most VR glasses on the market are designed with a fixed screen-lens module distance, which results in a fixed VID (Virtual Image Distance) in the optical system when imaging. VID refers to the distance from the last optical surface of the entire optical system to the virtual image. This limits the software application scenarios and user experience. If the distance from the screen to the lens module can be adjusted, that is, the VID is adjustable, then during software development, images at different distances from the human eye can be designed, thereby adding more application scenarios and improving the user experience.

[0004] In the prior art, although there have been some relevant studies on VID adjustment, there are still many difficulties, such as stable adjustment of the distance between the screen and the lens, inaccurate screen target positioning due to low transmission accuracy, and system sealing problems. Summary of the invention

[0005] The purpose of this application is to provide a new technical solution for optical systems and smart head-mounted devices.

[0006] In a first aspect, an embodiment of the present application provides an optical system, the optical system comprising:

[0007] Lens module;

[0008] The screen module is arranged along the same optical axis as the lens module;

[0009] A rotating ring, the outer side of which is provided with gear teeth along the circumferential direction, the rotating ring is arranged between the lens module and the screen module, and is threadedly connected with the screen module to form a transmission fit;

[0010] A motor and a driving gear, wherein the motor is disposed on the lens module and connected to the driving gear, and the driving gear is meshed with the gear teeth of the rotating ring;

[0011] Driven by the motor, the driving gear can drive the rotating ring to rotate, and after the rotation, the rotating ring can form a threaded transmission with the screen module, thereby enabling the screen module to move relative to the lens module along the optical axis direction.

[0012] Optionally, the lens module comprises a lens barrel and at least one lens disposed in the lens barrel, and a pin hole is provided on an outer wall of the lens barrel extending outward;

[0013] The screen module includes a screen bracket and a screen arranged on one side of the screen bracket;

[0014] The optical system comprises a guide column, one end of which is threadedly connected to the screen bracket, and the other end is inserted into the pin hole of the lens barrel, and the guide column can move in the pin hole along the optical axis direction.

[0015] Optionally, the size of the driving gear is smaller than that of the rotating ring.

[0016] Optionally, a sliding groove is provided on the outer wall of the lens barrel along the circumferential direction;

[0017] The rotating ring is sleeved on one end of the lens barrel close to the screen module. A threaded hole is circumferentially arranged on the rotating ring. A positioning pin is arranged in the threaded hole, and the tail end of the positioning pin extends into the sliding groove.

[0018] Optionally, the positioning pin is provided with a threaded section matching the threaded hole;

[0019] The number of the positioning pins is at least two, and the positioning pins and the threaded holes are arranged in a one-to-one correspondence.

[0020] Optionally, a mounting hole is provided on the screen bracket, and an insert nut is embedded in the mounting hole;

[0021] One end of the guide post is provided with a threaded structure and is threadedly connected with the insert nut.

[0022] Optionally, a shaft sleeve is embedded in the pin hole of the lens barrel, and the other end of the guide column can be movably inserted in the shaft sleeve.

[0023] Optionally, a motor assembly portion is provided on the outer wall of the lens barrel;

[0024] The motor output shaft of the motor is inserted into the motor assembly portion and connected to the driving gear.

[0025] Optionally, the slide groove of the lens barrel, the threaded connection between the rotating ring and the screen bracket, and between the guide column and the bushing are filled with grease.

[0026] In a second aspect, an embodiment of the present application provides a smart head-mounted device. The smart head-mounted device includes:

[0027] casing; and

[0028] As described in the first aspect, the optical system is arranged in the housing.

[0029] The beneficial effects of this application are:

[0030] The optical system provided in the embodiment of the present application realizes the stable movement of the screen module along the optical axis relative to the lens module by introducing a specially designed rotating ring and arranging it between the lens module and the screen module; wherein, the outer side of the rotating ring is provided with gear teeth that can mesh with the driving gear. This design enables the motor to control the rotation angle of the rotating ring when rotating, thereby ensuring that the distance the screen moves along the optical axis during AFD (adaptive focus display) adjustment can be accurately controlled. In addition, the rotating ring cooperates with the screen bracket through threads. Since the entire circle of threads is subjected to force, the screen module can stably move along the optical axis relative to the lens module without causing the screen to tilt, that is, it can avoid the problem of poor MTF and blurred images of the optical system due to the deterioration of the parallel relationship between the screen and the lens.

[0031] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0033] Figure 1 A schematic diagram of the structural decomposition of the optical system of an embodiment of the present application;

[0034] Figure 2 A schematic diagram of the external structure of an optical system according to an embodiment of the present application;

[0035] Figure 3 A cross-sectional view of an optical system according to an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the structure of a guide post of an optical system according to an embodiment of the present application;

[0037] Figure 5 A schematic diagram of the structure of a positioning pin of an optical system according to an embodiment of the present application;

[0038] Figure 6 A schematic structural diagram of a viewing angle of a lens barrel of an optical system according to an embodiment of the present application;

[0039] Figure 7 A schematic structural diagram of another viewing angle of the lens barrel of the optical system of an embodiment of the present application;

[0040] Figure 8 A schematic diagram of the structure of a rotating ring of an optical system according to an embodiment of the present application;

[0041] Fig. 9 for Figure 8 The cross-sectional view along the AA direction;

[0042] Fig.10 for Figure 8 The enlarged view of point A in the middle;

[0043] Fig.11 for Fig. 9 A magnified schematic diagram of point B in the middle.

[0044] Description of reference numerals:

[0045] 1. Lens barrel; 101. Pin hole; 102. Motor assembly part; 103. Slide groove; 2. Lens; 3. Rotating ring; 301. Threaded hole; 302. Gear teeth; 4. Positioning pin; 401. Threaded section; 5. Screen bracket; 501. Mounting hole; 6. Motor; 601. Motor output shaft; 7. Driving gear; 8. Bushing; 9. Guide column; 901. Threaded structure; 10. Insert nut; 11. Screen. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0048] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] The optical system and the smart head-mounted device provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0052] According to one aspect of the embodiments of the present application, an optical system is provided. Figures 1 to 3 The optical system includes a lens module, a screen module, a rotating ring 3, a motor 6 and a driving gear 7; the screen module and the lens module are arranged along the same optical axis; the outer side of the rotating ring 3 is circumferentially provided with gear teeth 302, the rotating ring 3 is arranged between the lens module and the screen module, and is threadedly connected with the screen module to form a transmission match; the motor 6 is arranged in the lens module and connected with the driving gear 7, and the driving gear 7 is meshed with the gear teeth 302 of the rotating ring 3; under the drive of the motor 6, the driving gear 7 can drive the rotating ring 3 to rotate, and the rotating ring 3 can form a threaded transmission with the screen module after rotation, so that the screen module can move relative to the lens module along the optical axis direction.

[0053] The optical system provided in the embodiment of the present application includes a lens module, a screen module and a rotating ring 3, and the rotating ring 3 is designed to be located between the lens module and the screen module.

[0054] The lens module and the screen module are the core optical components of the entire optical system. They are arranged in series along the same optical axis. The lens module is located on the light-emitting side of the screen module. This layout ensures the accurate transmission of light and the clarity of imaging. Specifically, the lens module is responsible for capturing and focusing light to ensure the clarity of imaging. The screen module is responsible for displaying images and emitting imaging light. Its precise alignment with the lens module is the basis for obtaining a high-quality visual experience.

[0055] The rotating ring 3, see Figures 1 to 3 ,as well as Figures 8 to 11 , which is a key innovative component in this application. From the perspective of structural design, it is annular, and gear teeth 302 are arranged on its outer side along the circumferential direction, see Fig.10 , can mesh with the driving gear 7 to achieve power transmission. At the same time, the rotating ring 3 and the screen module are designed to be threadedly connected. When the rotating ring 3 rotates, it can drive the screen module to move relative to the lens module along the optical axis direction to get closer to or farther away from the lens module as needed.

[0056] The optical system provided in the embodiment of the present application further includes a motor 6. The motor 6 serves as a power source and provides a driving force for the movement of the screen module. In the present application, the motor 6 is connected to the driving gear 7, so that the driving gear 7 drives the rotating ring 3 to rotate.

[0057] According to the optical system provided in the embodiment of the present application, the rotating ring 3 plays an important role. The gear teeth 302 arranged circumferentially on the outer side thereof mesh with the driving gear 7. This design realizes the power transmission from the motor 6 to the rotating ring 3. Specifically, when the motor 6 is started, the driving gear 7 drives the rotating ring 3 to rotate. Due to the precise meshing of the gear teeth 302, the rotation angle of the rotating ring 3 can be precisely controlled. This feature is crucial for AFD (adaptive focus display) adjustment because it ensures the stability and accuracy of the screen module during movement.

[0058] The threaded connection between the rotating ring 3 and the screen module is another noteworthy design. This connection is not only stable and reliable, but also able to withstand various forces generated by the screen module during movement, including thrust along the optical axis and possible lateral forces. In addition, the threaded connection also has a self-locking function, which helps prevent the screen module from moving on its own when not acted upon by external forces, thereby ensuring the stability of the entire optical system.

[0059] The optical system provided in the embodiments of the present application can bring the following technical effects:

[0060] (1) Precise AFD adjustment: Through the cooperation of the motor 6, the driving gear 7 and the rotating ring 3, the screen module can be precisely moved relative to the lens module along the optical axis. This precise AFD (adaptive focus screen) adjustment function enables the optical system to adjust the distance between the screen and the lens in real time according to user needs, thereby optimizing the imaging effect.

[0061] (2) Stable screen movement: Since the rotating ring 3 and the screen module are connected by a thread, this connection method has a self-locking function, which can prevent the screen module from moving on its own when no external force is applied; and during the AFD adjustment process, the screen module can maintain stable movement without problems such as tilting or shaking, thereby ensuring the clarity and stability of the imaging.

[0062] (3) Efficient transmission mechanism: The meshing design between the driving gear 7 and the gear teeth 302 of the rotating ring 3 realizes efficient transmission of the power of the motor 6 to the rotating ring 3. This transmission mechanism is not only reliable, but also can reduce energy loss and improve the operating efficiency of the entire optical system.

[0063] The optical system provided in the embodiment of the present application has precise AFD adjustment function and stable screen module movement performance.

[0064] In some examples of this application, see Figures 1 to 3 The lens module comprises a lens barrel 1 and at least one lens 2 disposed in the lens barrel 1; a pin hole 101 is provided on the outer wall of the lens barrel 1 extending outward, see Figure 6 and Figure 7 ; The screen module includes a screen bracket 5 and a screen 11 arranged on one side of the screen bracket 5; the optical system includes a guide column 9, one end of which is threadedly connected to the screen bracket 5, and the other end is inserted into the pin hole 101 of the lens barrel 1, and the guide column 9 can move along the optical axis direction in the pin hole 101.

[0065] The design of the lens module of the present application takes into account both simplicity and functionality, and is mainly composed of a lens barrel 1 and at least one lens 2, and all lenses 2 are contained in the lens barrel 1 for capturing and focusing light. It should be noted that in the lens barrel 1, all lenses 2 are arranged in series along the same optical axis.

[0066] The lens barrel 1 of the present application is, for example, an injection molded part. Specifically, a pin hole 101 is provided on the outer wall of the lens barrel 1 extending outward, which provides positioning and guidance for the subsequent connection with the screen module.

[0067] The screen module of the present application includes a screen support 5 and a screen 11. The screen support 5 is a key component for supporting and fixing the screen 11, and its stability and durability are very important. The screen 11 is firmly arranged on one side of the screen support 5 (such as the side away from the lens barrel 1), and the screen 11 is used to display images and can emit light for imaging display.

[0068] It is worth mentioning that the optical system of the embodiment of the present application also adds a guide post 9 design. One end of the guide post 9 is threadedly connected to the screen bracket 5, and the other end is inserted into the pin hole 101 on the outer wall of the lens barrel 1. This connection method is not only stable and reliable, but also can achieve stable movement of the screen module relative to the lens module along the optical axis.

[0069] In one example, the number of guide pillars 9 is, for example, two.

[0070] See also Figures 1 to 3 When the motor 6 drives the rotating ring 3 to rotate through the driving gear 7, the rotating ring 3 drives the screen bracket 5 and the screen 11 to move along the optical axis based on the threaded connection. The guide column 9 can slide up and down in the pin hole 101 of the lens barrel 1, playing a guiding and supporting role. This design not only ensures the stability of the screen module during movement, but also effectively prevents the screen module from rotating during movement.

[0071] In summary, the guide post 9 mentioned in this example of the present application has the main function of ensuring that the screen bracket 5 moves only in a straight line along the optical axis direction when moving relative to the lens 2, without deflection or rotation. This design ensures the stability of the screen module during the AFD adjustment process, and avoids problems such as reduced imaging quality or module damage caused by movement trajectory deviation. In addition, the guide post 9 also bears the role of supporting the weight and load of the screen bracket 5.

[0072] In some examples of this application, see Figure 1 , the size of the driving gear 7 is smaller than the size of the rotating ring 3.

[0073] That is to say, in the present application, the driving gear 7 is designed as a small gear, and the driven gear is the rotating ring 3, and the rotating ring 3 is equivalent to a large gear. The small gear drives the large gear to form a labor-saving lever, that is, the motor transmits a smaller torque to drive the adjustment of the entire screen module, so the adjustment process will be smoother.

[0074] Specifically, from the perspective of transmission efficiency, the small-sized driving gear 7 cooperates with the large-sized rotating ring 3 to form a structure similar to a reducer. When the motor 6 drives the driving gear 7 to rotate, due to the transmission ratio between the gears (i.e., the ratio of the number of teeth on the driving gear to the number of teeth on the driven gear), the rotation speed of the rotating ring will slow down accordingly, but the torque obtained will increase. This means that the motor 6 can achieve stable rotation of the rotating ring with a smaller driving torque, thereby driving the screen module to move smoothly along the optical axis. This design not only improves the stability of the transmission, but also reduces the energy consumption of the motor 6, which is conducive to extending the service life of the equipment.

[0075] In some examples of this application, see Figures 1 to 3 A slide groove 103 is circumferentially arranged on the outer wall of the lens barrel 1; the rotating ring 3 is sleeved on one end of the lens barrel 1 close to the screen module, and a threaded hole 301 is circumferentially arranged on the rotating ring 3, a positioning pin 4 is arranged in the threaded hole 301, and the tail end of the positioning pin 4 extends into the slide groove 103.

[0076] According to this example of the present application, the rotating ring 3 is sleeved on one end of the lens barrel 1 close to the screen module, and a plurality of threaded holes 301 are arranged on the rotating ring 3 along the circumference. The positioning pin 4 is installed in the threaded hole 301, and the tail end of the positioning pin 4 extends into the slide groove 103 of the lens barrel 1. This design ensures the stable rotation of the rotating ring 3 relative to the lens barrel 1, and prevents the rotating ring 3 from falling off.

[0077] According to the solution provided in this example of the present application, the rotating ring 3 can be stably restricted on the lens barrel 1 through the cooperation between the slide groove 103 and the positioning pin 4, and can only rotate along the optical axis (ie, the Z direction) without falling off. This ensures the stability and reliability of the AFD adjustment process.

[0078] It should be noted that the lower part of the rotating ring 3 is provided with a threaded portion, which can match the mating thread on the screen bracket 5. This design enables the rotating ring 3 to drive the screen module to move along the optical axis through the thread when rotating, thereby realizing the AFD (adaptive focus screen) adjustment function.

[0079] In some examples of this application, see Figure 5 The positioning pin 4 is provided with a threaded section 401 matching the threaded hole 301; see Figures 1 to 3 The number of the positioning pins 4 is at least two, and the positioning pins 4 and the threaded holes 301 are arranged in a one-to-one correspondence.

[0080] See also Figure 5 , the positioning pin 4 is provided with a threaded section 401 matching the threaded hole 301. The positioning pin 4 can not only extend its tail into the slide groove 103 of the lens barrel 1 to play a limiting role, but also form a threaded connection with the threaded hole 301 of the rotating ring 3 through its own threaded section. This design increases the connection strength between the positioning pin 4 and the rotating ring 3, making it more stable.

[0081] Among them, the locating pins 4 are set to at least two and are set in one-to-one correspondence with the threaded holes 301. The one-to-one correspondence between at least two locating pins 4 and the threaded holes 301 can ensure that the rotation of the rotating ring 3 on the lens barrel 1 is more stable and uniform. This helps to reduce errors and fluctuations in the AFD adjustment process and improve the clarity and quality of the imaging picture. The design of the multiple locating pins 4 is that even if one of the locating pins fails or fails, the other locating pins can still keep the rotating ring stable. This improves the reliability and safety of the entire optical module.

[0082] In one example, see Figure 1 Four threaded holes 301 are arranged on the rotating ring 3 along the circumferential direction. At this time, four positioning pins 4 need to be arranged.

[0083] In some examples of this application, see Figure 1 The screen bracket 5 is provided with a mounting hole 501, and an insert nut 10 is embedded in the mounting hole 501; see Figure 4 One end of the guide column 9 is provided with a threaded structure 901 and is threadedly connected to the insert nut 10 .

[0084] The screen bracket 5 is provided with a mounting hole 501, and an insert nut 10 is embedded in the mounting hole 501. This design allows the screen bracket 5 to be made of a lightweight plastic material, which is conducive to reducing the weight of the optical system, thereby improving the wearing comfort of the user. In order to increase the stability and durability of the connection between the screen bracket 5 and the guide column 9, an insert nut 10 can be set in the mounting hole 501, so as to achieve a firm connection between the guide column 9 and the screen bracket 5.

[0085] See also Figure 4 One end of the guide post 9 is provided with a threaded structure 901, which is threadedly connected to the insert nut 10. This connection method provides stable axial positioning and can withstand forces from the X and / or Y directions, ensuring the stability of the screen module during the adjustment process.

[0086] In some examples of this application, see Figure 1 A shaft sleeve 8 is embedded in the pin hole 101 of the lens barrel 1 , and the other end of the guide column 9 is movably inserted in the shaft sleeve 8 .

[0087] A shaft sleeve 8 is embedded in the pin hole 101 of the lens barrel 1 . The shaft sleeve 8 may be made of a wear-resistant material to reduce friction and wear.

[0088] The other end of the guide post 9 is movably inserted into the shaft sleeve 8. This design allows the guide post to move along the optical axis (Z direction) in the shaft sleeve while maintaining low friction resistance.

[0089] In some examples of this application, Figure 6 and Figure 7 A motor assembly portion 102 is provided on the outer wall of the lens barrel 1; a motor output shaft 601 of the motor 6 is inserted into the motor assembly portion 102 and connected to the driving gear 7, see Figures 1 to 3 .

[0090] See also Figure 6 and Figure 7 A motor assembly portion 102 is provided on the outer wall of the lens barrel 1 , and the motor assembly portion 102 is used to install and fix the motor 6 .

[0091] Specifically, see Figures 1 to 3 , the motor output shaft 601 of the motor 6 is inserted into the motor assembly portion 102 and connected to the driving gear 7. This connection method ensures that the motor can stably and accurately drive the driving gear 7 to rotate.

[0092] According to this example of the present application, the motor 6 can be firmly mounted on the lens barrel 1 through the motor assembly portion 102 provided on the lens barrel 1, ensuring the stable output of the motor during the AFD adjustment process. The connection between the motor output shaft 601 and the driving gear 7 reduces the energy loss and error during the transmission process and improves the accuracy of the AFD adjustment. The design of the motor assembly portion 102 makes the structure of the entire optical system more compact, which is conducive to saving space and reducing costs.

[0093] In some examples of this application, see Figures 1 to 3 The inside of the slide groove 103 of the lens barrel 1, the threaded connection between the rotating ring 3 and the screen bracket 5, and between the guide column 9 and the shaft sleeve 8 are filled with grease.

[0094] In this example of the present application, grease can be filled in the slide groove 103 of the lens barrel 1, the threaded connection between the rotating ring 3 and the screen bracket 5, and between the guide column 9 and the sleeve 8.

[0095] Specifically, the use of grease significantly reduces the friction resistance between components, allowing the screen module to perform AFD adjustment more smoothly, reducing energy consumption and wear during the adjustment process. Due to the reduction in friction resistance, the screen module moves more smoothly and accurately during the adjustment process, further improving the accuracy of AFD adjustment.

[0096] Grease filling also helps maintain the sealing inside the screen module, for example, to prevent impurities such as dust and moisture from entering the module and affecting the module's performance and reliability.

[0097] In particular, the sealing effect of grease is particularly important at the threaded connection between the rotating ring 3 and the screen bracket 5 and between the guide column 9 and the shaft sleeve 8.

[0098] In the optical system provided in the embodiment of the present application, the rotating ring 3 as a core component can realize the following key functions:

[0099] (1) The screen assembly can stably move along the optical axis: The rotating ring 3 is tightly matched with the screen bracket 5 through the thread, ensuring that during the AFD adjustment process, the screen module can stably move along the optical axis (i.e., perpendicular to the screen and lens or the Z-axis direction) relative to the lens module. This design avoids the problem of screen 11 tilting, thereby maintaining the parallel relationship between the screen 11 and the lens 2, and preventing the decrease of the optical module MTF (modulation transfer function) and the phenomenon of image blur.

[0100] (2) Precise angle control: The gear teeth 302 designed on the outer side of the rotating ring 3 and the driving gear 7 on the motor 6 form a primary reducer. This means that the motor 6 only needs to transmit a small torque to easily drive the entire screen module for adjustment. This design not only reduces energy consumption, but also makes the adjustment process smoother. This design also enables the motor 6 to more accurately control the rotation angle of the rotating ring 3 when it rotates. Therefore, during the AFD adjustment process, the distance that the screen 11 moves along the optical axis can also be more accurately controlled.

[0101] Since the screen bracket 5 moves relative to the lens barrel 1 when the AFD is adjusted, the sealing problem becomes a challenge. However, the technical solution of the embodiment of the present application solves this problem well through the threaded cooperation between the rotating ring 3 and the screen bracket 5, and the further sealing effect of the grease. While transmitting power to the screen bracket 5, the rotating ring 3 always maintains a contact and cooperation relationship with the screen bracket 5, thereby ensuring the sealing inside the screen module.

[0102] According to another embodiment of the present application, a smart head-mounted device is provided, wherein the smart head-mounted device comprises a housing and the optical system as described above, wherein the optical system is disposed in the housing.

[0103] The smart head-mounted device provided in the embodiment of the present application is, for example, a VR smart head-mounted device, such as VR smart glasses or a VR smart helmet.

[0104] The smart head-mounted device proposed in the embodiment of the present application not only improves the product performance and user experience, but also broadens the application scenarios by integrating a VR optical system that can accurately implement AFD adjustment.

[0105] The optical system may be provided in two, one of which corresponds to the left eye of the user, and the other corresponds to the right eye of the user.

[0106] The specific implementation of the intelligent head mounted device of the embodiment of the present application can refer to the various embodiments of the above-mentioned optical system, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0107] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0108] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An optical system, characterized in that: include: Lens module; The screen module is arranged along the same optical axis as the lens module; A rotating ring (3) having gear teeth (302) arranged on its outer side along the circumferential direction, the rotating ring (3) being arranged between the lens module and the screen module and being threadedly connected to the screen module to form a transmission fit; a motor (6) and a driving gear (7), wherein the motor (6) is disposed on the lens module and connected to the driving gear (7), and the driving gear (7) is meshed with the gear teeth (302) of the rotating ring (3); Driven by the motor (6), the driving gear (7) can drive the rotating ring (3) to rotate, and after the rotating ring (3) is rotated, it can form a threaded transmission with the screen module, thereby enabling the screen module to move relative to the lens module along the optical axis direction.

2. The optical system according to claim 1, wherein: The lens module comprises a lens barrel (1) and at least one lens (2) arranged in the lens barrel (1); a pin hole (101) is provided on the outer wall of the lens barrel (1) extending outward; The screen module comprises a screen bracket (5) and a screen (11) arranged on one side of the screen bracket (5); The optical system comprises a guide column (9), one end of which is threadedly connected to the screen bracket (5), and the other end of which is inserted into a pin hole (101) of the lens barrel (1), and the guide column (9) is capable of moving in the pin hole (101) along the optical axis direction.

3. The optical system according to claim 1, wherein: The size of the driving gear (7) is smaller than the size of the rotating ring (3).

4. The optical system according to claim 2, wherein: A sliding groove (103) is provided on the outer wall of the lens barrel (1) along the circumferential direction; The rotating ring (3) is sleeved on one end of the lens barrel (1) close to the screen module, and a threaded hole (301) is provided on the rotating ring (3) along the circumference. A positioning pin (4) is provided in the threaded hole (301), and the tail end of the positioning pin (4) extends into the sliding groove (103).

5. The optical system according to claim 4, wherein: The positioning pin (4) is provided with a threaded section (401) matching the threaded hole (301); The number of the positioning pins (4) is at least two, and the positioning pins (4) and the threaded holes (301) are arranged in a one-to-one correspondence.

6. The optical system according to claim 4, wherein: The screen bracket (5) is provided with a mounting hole (501), and an insert nut (10) is embedded in the mounting hole (501); One end of the guide column (9) is provided with a threaded structure (901) and is threadedly connected to the insert nut (10).

7. The optical system according to claim 6, wherein: A shaft sleeve (8) is embedded in the pin hole (101) of the lens barrel (1), and the other end of the guide column (9) is movably inserted into the shaft sleeve (8).

8. The optical system according to claim 7, wherein: A motor assembly portion (102) is provided on the outer wall of the lens barrel (1); The motor output shaft (601) of the motor (6) is inserted into the motor assembly portion (102) and connected to the driving gear (7).

9. The optical system according to claim 7, wherein: The inside of the slide groove (103) of the lens barrel (1), the threaded connection between the rotating ring (3) and the screen bracket (5), and between the guide column (9) and the shaft sleeve (8) are filled with grease.

10. A smart head-mounted device, characterized in that: include: shell; and The optical system according to any one of claims 1 to 9, wherein the optical system is arranged in the housing.

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