Optical module and wearable device

Abstract

The embodiment of the application provides an optical module and a wearable device; the optical module comprises a lens set, a lens barrel, a driving rod, two driven rods, a first transmission belt, a second transmission belt and a focusing member; the lens set comprises at least a first lens and is a cut-edge lens; the first lens is movably arranged in the lens barrel; the driving rod and the two driven rods are arranged in the lens barrel; the periphery of the first lens is threadedly connected with the two driven rods; the driving rod is connected with a driving gear; the driven rods are connected with driven gears; the driving gear and the driven gears are double-layer gears; the double-layer gears comprise coaxially arranged first gears and second gears; the first transmission belt is sleeved outside the first gears of the driving gear and one of the driven gears; the second transmission belt is sleeved outside the second gears of the driving gear and the other of the driven gears; the focusing member is connected with the driving rod; when the focusing member is rotated, the driving rod drives the driven rods to rotate relative to the lens barrel, so that the first lens moves axially relative to the lens barrel.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of optical imaging technology, and more particularly, to an optical module and a wearable device. BACKGROUND

[0002] Virtual reality technology (VR), also known as spirit world technology, is a new practical technology developed in the 20th century. Virtual reality technology integrates computer, electronic information and simulation technology, and its basic implementation is to simulate a virtual environment by a computer to give people a sense of environmental immersion. With the continuous development of social productivity and scientific technology, the demand for VR technology in various industries is increasing. At the same time, the vision of the user group is quite different, and the VR device needs to meet the needs of different vision groups, therefore, it is necessary for the product to have a diopter adjustment function.

[0003] However, in the prior art, the distance between the lenses is adjusted by rotating the circular adjustment ring to move the front and rear positions of the lenses when the lenses do not have a cut edge. However, when the lenses have a cut edge, the above-mentioned scheme of adjusting the position of the lenses by using a circular adjustment ring is no longer applicable. SUMMARY

[0004] The purpose of the present application is to provide a new technical solution for an optical module and a wearable device, which can realize the position movement of the cut-edge lenses and thus realize the diopter adjustment of the optical module with cut-edge lenses.

[0005] In a first aspect, the present application provides an optical module. The optical module comprises:

[0006] a lens group, the lens group comprising at least a first lens, the first lens being a cut-edge lens;

[0007] a lens barrel, the first lens being movably arranged in the lens barrel;

[0008] a driving rod and two driven rods, the driving rod and the two driven rods being rotatably arranged in the lens barrel, the periphery of the first lens being in threaded transmission with the two driven rods, the driving rod being connected with a driving gear, the driven rods being connected with driven gears, the driving gear and the driven gears being double-layer gears, the double-layer gears comprising coaxially arranged first gears and second gears;

[0009] a first transmission belt and a second transmission belt, the first transmission belt being sleeved outside the first gears of the driving gear and one of the driven gears, and the second transmission belt being sleeved outside the second gears of the driving gear and the other driven gear;

[0010] a focusing member connected with the driving rod;

[0011] When the focusing member is rotated, the driving rod drives the two driven rods to rotate relative to the lens barrel, and the first lens moves axially relative to the lens barrel under the screw transmission to match the diopter of the target object.

[0012] Optionally, the first lens is arranged in the first support, and a side of the first support has a cut side matching a lens cut side of the first lens.

[0013] Optionally, the driving rod is arranged as a rotating shaft, and the two driven rods are arranged as lead screws.

[0014] The outer edge of the first support is provided with two opposite first threaded holes, the lead screw is inserted into the first threaded hole and is threadedly connected with the first threaded hole through a threaded segment of the lead screw, and the inner wall of the lens barrel is respectively provided with a first accommodating groove and a first assembly hole.

[0015] The first accommodating groove is provided with a baffle, the lead screw extends out of a through hole on the baffle and is connected with the driven gear.

[0016] The rotating shaft is inserted into the first assembly hole and is connected with the driving gear.

[0017] Optionally, the outer side of the first threaded hole is provided with a first clamping groove, and the first clamping groove is provided with a sealing member.

[0018] Optionally, the driving rod and the two driven rods are arranged as lead screws.

[0019] The outer edge of the first support is provided with three second threaded holes, the lead screw is inserted into the second threaded hole and is threadedly connected with the second threaded hole through a threaded segment of the lead screw.

[0020] The inner wall of the lens barrel is provided with a second accommodating groove, the second accommodating groove is provided with the second threaded hole in one-to-one correspondence, and the second threaded hole is located in the second accommodating groove.

[0021] The second accommodating groove is provided with a baffle, the lead screw extends out of a through hole on the baffle and is connected with the driven gear or the driving gear.

[0022] Optionally, the outer side of the second threaded hole is provided with a second clamping groove, and the second clamping groove is provided with a sealing member.

[0023] Optionally, the optical module further comprises a protective cover, the protective cover is arranged at one end of the lens barrel.

[0024] The protective cover has a containing space, the driving gear, the driven gear, the first transmission belt and the second transmission belt are located in the containing space.

[0025] Optionally, the driving rod is inserted into the gear shaft of the driving gear and passes through the protective cover, and the driving rod is fixed by the first fastener outside the protective cover.

[0026] The driven rod is inserted into the gear shaft of the driven gear and passes through the protective cover, and the driven rod is fixed by the second fastener outside the protective cover.

[0027] Optionally, the first fastener and the second fastener are both clamping springs, the clamping spring comprises a body and an opening arranged on one side of the body, the body is annular and an engaging portion in communication with the opening is formed inside.

[0028] Optionally, the lens set further comprises a second lens, the second lens is arranged in the second support, the second support is arranged at the end of the lens barrel away from the protective cover;

[0029] The second lens is arranged as a cut-off lens, the first lens and the second lens both have at least one lens cut-off, the lens cut-off of the first lens and the lens cut-off of the second lens correspond to each other.

[0030] The side of the second support has a cut-off side corresponding to the lens cut-off of the second lens.

[0031] Optionally, the lens set further comprises a third lens, the third lens is arranged at the end of the lens barrel close to the protective cover, and the protective cover is located outside the third lens, and an avoiding area corresponding to the third lens is formed on the protective cover;

[0032] The first lens is movably arranged between the second lens and the third lens, the first lens, the second lens and the third lens are located on the same optical axis.

[0033] In a second aspect, the present application provides a wearable device, the wearable device comprises:

[0034] A housing; and

[0035] The optical module as described in the first aspect is arranged in the housing.

[0036] Optionally, the shell is a frame, two mirror frames are arranged on the frame, and two optical modules are arranged in the two mirror frames.

[0037] The application has the following beneficial effects:

[0038] According to the optical module provided in the application, the cut-edge lens is applied, the cut-edge lens with irregular shape can be stably linearly moved along the axial direction in the lens barrel by adopting the mode of pushing at least two points, so as to adjust the position of the cut-edge lens in the lens barrel, thereby matching the visual acuity of the user; the mode of pushing the cut-edge lens to move in the application has higher reliability and is not prone to tilting and being stuck; the optical scheme in the application is suitable for being applied to the wearable device with adjustable visual acuity, and the user can still watch clear images without wearing glasses.

[0039] Other characteristics and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, which description refers to the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0041] Figure 1 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0042] Figure 2 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure; Figure 1 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0043] Figure 3 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure; Figure 2 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0044] Figure 4 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure; Figure 1 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0045] Figure 5 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0046] Figure 6 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure; Figure 5 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0047] Figure 7 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure; Figure 5 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;

[0048] Figure 8 A structural schematic diagram of an optical module provided in an embodiment of the application is shown in the figure;Figure 5 A structural exploded schematic view of the optical module shown;

[0049] Figure 9 A structural schematic view of a double-layer gear in the optical module provided by the embodiment of the present application;

[0050] Figure 10 A structural schematic view of a focusing member in the optical module provided by the embodiment of the present application;

[0051] Figure 11 A structural schematic view of a rotating shaft in the optical module provided by the embodiment of the present application;

[0052] Figure 12 A structural schematic view of a screw rod in the optical module provided by the embodiment of the present application;

[0053] Figure 13 A structural schematic view of a protective cover in the optical module provided by the embodiment of the present application;

[0054] Figure 14 A structural schematic view of a circlip in the optical module provided by the embodiment of the present application.

[0055] Explanation of reference numerals:

[0056] 1, first lens; 2, second lens; 3, third lens; 4, first support; 401, first threaded hole; 4011, first clamping groove; 402, second threaded hole; 4021, second clamping groove; 5, second support; 6, lens barrel; 601, first accommodating groove; 603, second accommodating groove; 604, longitudinal section; 7, driving rod; 8, driven rod; 9, rotating shaft; 10, screw rod; 1001, threaded section; 11, double-layer gear; 1101, first gear; 1102, second gear; 12, first transmission belt; 13, second transmission belt; 14, focusing member; 15, protective cover; 1501, avoiding area; 16, circlip; 1601, body; 1602, opening; 1603, clamping portion; 17, sealing member; 18, baffle; 1801, through hole. DETAILED DESCRIPTION

[0057] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in these embodiments, numerical expressions, and numerical values are not limiting to the scope of the present application unless otherwise specifically stated.

[0058] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0059] Techniques and devices known to those of ordinary skill in the art can not be discussed in detail herein, but should be considered as part of the specification.

[0060] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0061] It should be noted that like reference numerals and letters refer to like items throughout the several views, and as such, once an item is defined in one view, it need not be discussed further in subsequent views.

[0062] According to an aspect of the embodiments of the present application, an optical module is provided, which is suitable for application in a head mounted display (HMD), such as a VR head mounted display. The VR head mounted display can include a VR eyeglass or a VR helmet, and the embodiments of the present application do not make specific limitations thereto.

[0063] In the design of a VR product, taking a VR eyeglass as an example, in order to avoid the product from the nose bridge, brow bone and other areas of the user, the lens applied in the optical module can be edge cut, and the lens forms a non-circular structure, and the corresponding lens barrel also forms a non-circular shape. The edge cut lens is irregular in shape.

[0064] However, another problem caused by this is that due to the large difference in vision of the user group, the distance between the lenses or the distance between the lenses and the display screen needs to be adjusted to meet the diopter adjustment, and the lens cannot be axially moved by rotating the lens after edge cutting, and cannot meet the use requirements of different vision groups.

[0065] The optical module provided by the embodiments of the present application, as shown in Figures 1 to 8 , the optical module comprises a lens group, a lens barrel 6, a driving rod 7, two driven rods 8, a first transmission belt 12, a second transmission belt 13 and a focusing member 14.

[0066] The lens group comprises at least a first lens 1, the first lens 1 is arranged as an edge cut lens, and the first lens 1 is movably arranged in the lens barrel 6.

[0067] The driving rod 7 and the two driven rods 8 are rotatably arranged in the lens barrel 6, the periphery of the first lens 1 is in threaded transmission with the two driven rods 8, the driving rod 7 is connected with a driving gear, the driven rod 8 is connected with a driven gear, the driving gear and the driven gear are both double-layer gears 11, the double-layer gears 11 comprise a first gear 1101 and a second gear 1102 arranged coaxially, as shown inFigure 9 ;

[0068] The first transmission belt 12 is sleeved outside the first gear 1101 of the driving gear and one of the driven gears, and the second transmission belt 13 is sleeved outside the second gear 1102 of the driving gear and the other driven gear, see Figure 2 and Figure 7 ;

[0069] The focusing member 14 is connected with the driving rod 7; when focusing, the focusing member 14 is rotated, the driving rod 7 drives each driven rod 8 to rotate relative to the lens barrel 6 at the same time, so that the first lens 1 moves axially relative to the lens barrel 6 under the threaded transmission to match the visual acuity of the target object.

[0070] In the above embodiment, the first lens 1 is arranged in the inner cavity of the lens barrel 6, and the first lens 1 is arranged as a movable lens. By moving the position of the first lens 1 in the lens barrel 6, the diopter adjustment of the optical module can be realized. The optical scheme provided in the embodiment of the application is suitable for application in a wearable device with adjustable visual acuity, and the user can still watch a clear image without wearing glasses.

[0071] The first lens 1 is, for example, a cut-edge lens. Specifically, the first lens 1 has at least one lens cut edge (longitudinal cut edge), which makes the first lens 1 present a non-entirely circular structure in appearance, which is an irregular shape. On this basis, the corresponding lens barrel 6 also has at least one longitudinal cut surface 604 matched with the above-mentioned lens cut edge, see Figure 4 , so that the lens barrel 6 is a non-entirely circular structure or an irregular shape.

[0072] In the optical module provided in the embodiment of the application, a cut-edge lens (the first lens 1 described above) is applied, based on the irregular shape of the cut-edge lens, a driving rod 7 is designed to drive two driven rods 8 to rotate synchronously, and a two-point or three-point pushing mode is used to make the cut-edge lens with irregular shape move linearly in the axial direction of the lens barrel 6 stably, so as to adjust the position of the cut-edge lens in the lens barrel 6, and thus the visual acuity of the user can be matched. In the scheme provided in the embodiment of the application, the pushing mode for moving the cut-edge lens (the first lens 1) has higher reliability and stability, and is less likely to be tilted and stuck. The optical scheme of the application is suitable for application in a wearable device with adjustable visual acuity, and the user can still watch a clear image without wearing glasses.

[0073] Specifically, when the focusing element 14 is rotated, the driving gear connected with the focusing element 14 is rotated, and the driving rod 7 connected with the driving gear is also rotated. Meanwhile, the driving gear drives the two driven gears through the first transmission belt 12 and the second transmission belt 13, and the two driven gears synchronously drive the two driven rods 8. The two driven rods 8 can be in threaded transmission matching relationship with the outer periphery of the first lens 1. Thus, with the synchronous rotation of the two driven rods 8, the first lens 1 can form stable threaded feeding or retreating movement on the two driven rods 8, that is, the first lens 1 can make reciprocating linear motion along the axial direction of the lens barrel 6, so as to realize the power adjustment.

[0074] The driving gear and the driven gear are designed as double-layer gears 11. Referring to Figure 9 The double-layer gears 11, for example, include coaxially arranged first gears 1101 and second gears 1102, which are arranged in a stacked manner and can synchronously rotate without affecting each other.

[0075] The driving gear needs to form a triangular transmission matching relationship with the two driven gears on both sides. In the embodiment of the present application, the driving gear and the driven gear include coaxial first gears 1101 and second gears 1102, so that the same driving gear can be used to form a stable and small space-occupying transmission structure with two transmission belts and two driven gears.

[0076] The first transmission belt 12 and the second transmission belt 13 can form meshing transmission relationship with the driving gear and the driven gear, and the transmission stability is good.

[0077] For example, when the first transmission belt 12 is designed to be sleeved on the outside of each first gear 1101, the surface of the first transmission belt 12 in contact with the first gear 1101 should have a toothed structure meshing with the first gear 1101. When the first transmission belt 12 is sleeved on the outside of each second gear 1102, the surface of the first transmission belt 12 in contact with the second gear 1102 should have a toothed structure meshing with the second gear 1102.

[0078] It should be noted that the second transmission belt 13 has the same design concept as the first transmission belt 12, and the second transmission belt 13 has a toothed structure meshing with the first gear 1101 or the second gear 1102, which will not be described again here.

[0079] In addition, for the same double-layer gear 11 including the first gear 1101 and the second gear 1102, the first gear 1101 and the second gear 1102 can be designed to be different in size, which can save space and reduce cost.

[0080] Due to the optical module provided by the embodiment of the present application, the cut-edge lens is adopted in the design, and the cut-edge lens is a lens with a non-integer circular shape. Specifically, the edge of the first lens 1 has at least one lens cut edge. In this way, the lens barrel with the cut-edge lens can avoid the user's brow and nose bridge area, thereby improving the comfort of the user wearing.

[0081] The optical module provided by the embodiment of the present application is designed to enable the first lens 1 to move linearly along the axial direction of the lens barrel 6 within a set range. In this way, the position of the first lens 1 in the lens barrel 6 can be changed, that is, the distance between the first lens 1 and other lenses in the lens barrel 6 or the distance between the first lens 1 and the display screen in the optical module can be adjusted, thereby enabling the adjustment of the diopter of the optical module, so as to match the user's visual acuity. In this way, the optical module formed can be used for people with different visual acuity. The use experience of the user wearing glasses can be improved, and the user does not need to wear glasses, but can match his / her visual acuity through the visual acuity adjustment function of the optical module.

[0082] The design in the present application solves the problem that the cut-edge lens scheme in the prior art cannot control the axial movement of the lens by rotating the rotating member to rotate along the circumferential direction of the lens barrel to adjust the diopter.

[0083] Optionally, the rotation of the focusing member 14 can be driven by a driving mechanism.

[0084] Of course, the rotation of the focusing member 14 can also be directly driven by manual operation, and the driving mode for driving the rotation of the focusing member 14 is not specifically limited in the embodiment of the present application.

[0085] Optionally, referring to Figure 10 , the focusing member 14 is a circular knob, and an anti-slip structure is arranged on the side of the focusing member 14.

[0086] The anti-slip structure is, for example, a continuous ridge structure. Of course, it can also be other pattern structures. It is used to prevent the manual operation of the focusing member 14 from slipping when rotating, thereby affecting the focusing accuracy.

[0087] In addition, the optical focusing scheme provided by the embodiment of the present application is especially suitable for the lens barrel of a large cut-edge lens, and of course, it is also suitable for the conventional lens barrel of a circular lens, and the application range is wide.

[0088] The optical module provided by the embodiment of the present application, for example, comprises a lens group, and the lens group includes at least one movable lens, such as the first lens 1 described above, and the lens group further includes a fixed lens to maintain the interpupillary distance.

[0089] For example, the optical module includes a single movable first lens 1, on the basis of which the optical module further includes a light splitting element, a phase retarder and a polarization reflection element, which are located in the lens barrel 6 and can be arranged on either side of the single first lens 1 or on both sides, so that the optical module forms a folded optical path, and the imaging light rays are folded between the formed folded optical paths, which can prolong the propagation path of the light rays and facilitate the final clear imaging.

[0090] In the optical module of the embodiments of the present application, the number of lenses includes but is not limited to the above, and can be flexibly adjusted according to specific needs. Among them, with the increase of the number of lenses, although the imaging quality of the optical module can be improved, it will also affect the size of the optical module along the optical axis direction (lateral direction), resulting in a larger volume and weight of the optical module.

[0091] Among them, the light splitting element is, for example, a semi-transparent and semi-reflective device, which can transmit a part of light and reflect another part of light. The reflectivity of the light splitting element is, for example, 47% to 53%.

[0092] Among them, the phase retarder is, for example, a quarter-wave plate. Of course, the phase retarder here can also be set as other phase retarders such as half-wave plates according to needs. The phase retarder can be used to change the polarization state of light. For example, it is used to convert linearly polarized light into circularly polarized light, or to convert circularly polarized light into linearly polarized light.

[0093] Among them, the polarization reflection element is a polarization reflector that reflects horizontally linearly polarized light and transmits vertically linearly polarized light, or other any specific angle linearly polarized light reflection and transmits linearly polarized light perpendicular to the angle.

[0094] In the embodiments of the present application, the phase retarder and the polarization reflection element cooperate with each other, which can be used to analyze and transmit light.

[0095] Among them, the light splitting element, the phase retarder and the polarization reflection element are arranged flexibly in the lens group, for example, on either side of the first first lens 1 or on both sides, but it is necessary to ensure that the phase retarder is between the light splitting element and the polarization reflection element.

[0096] In some examples of the present application, the first lens 1 is arranged in the first support 4, and the side of the first support 4 has a cut edge side matched with the lens cut edge of the first lens 1.

[0097] The first lens 1 is supported by a special first support 4, which is located at the outer periphery of the first lens 1 and can protect the first lens 1 and facilitate transmission cooperation with the lens barrel 6.

[0098] The first support 4 is, for example, a ring structure that is matched with the shape of the first lens 1 and has a hollow region in the middle to facilitate fixed installation of the first lens 1. The first lens 1 can be fixed in the first support 4 by, for example, adhesion. The first support 4 has a simple structure and is easy to assemble into the lens barrel 6.

[0099] In some examples of the present application, referring to Figures 1 to 4 , the driving rod 7 is designed as a rotating shaft 9, and the two driven rods 8 are designed as two lead screws 10; the outer edge of the first support 4 is provided with two opposite first threaded holes 401, the lead screws 10 are inserted into the first threaded holes 401 and are threadedly connected with the first threaded holes 401 through their threaded segments 1001; the inner wall of the lens barrel 6 is respectively provided with a first accommodating groove 601 and a first assembly hole, the first accommodating grooves 601 and the first threaded holes 401 are one-to-one correspondingly arranged, and the first threaded holes 401 are located in the first accommodating grooves 601; the first accommodating grooves 601 are provided with a baffle 18, the lead screws 10 extend out of the through holes 1801 in the baffle 18 and are connected with the driven gears; the rotating shaft 9 is inserted into the first assembly hole and is connected with the driving gear.

[0100] The above example provides a double-point pushing type transmission structure design. The driving rod 7 is designed as a rotating shaft 9, referring to Figure 11 , which has no threaded segment, and the driving rod 7 can only form rotational cooperation with the lens barrel 6. The driven rod 8 is designed as two lead screws 10, referring to Figure 12 , which has a threaded segment 1001 on the upper part, and the threaded segments of the two lead screws 10 can form a threaded transmission cooperation relationship with the two first threaded holes 401 that are correspondingly arranged on the first support 4. This transmission structure is relatively simple and has fewer components.

[0101] The whole transmission process is as follows, referring to Figure 4The focusing member 14 rotates and drives the rotating shaft 9 and the driving gear together. The driving gear drives the two driven gears synchronously through the first transmission belt 12 and the second transmission belt 13. The two driven gears can drive the two lead screws 10 to rotate. The threaded section 1001 of the lead screw 10 can form a threaded transmission with the first threaded hole 401 of the first support 4. Thus, the first support 4 carries the first lens 1 to move linearly along the axial direction of the lens barrel 6 as the lead screw 10 rotates. Since the two lead screws 10 cooperatively drive the first lens 1 to move, the first lens 1 has high reliability and is not prone to lens tilting and being stuck.

[0102] Optionally, referring to Figure 4 The outer side of the first threaded hole 401 is provided with a first clamping groove 4011, and the first clamping groove 4011 is provided with a sealing member 17.

[0103] Specifically, two sealing members 17, for example, sealing rings, can be sleeved in the first clamping groove 4011 on the outer side of the first threaded hole 401.

[0104] When assembling the optical module, the first lens 1 can be bonded and fixed in the first support 4, and then the first support 4 can be assembled into the inner cavity of the lens barrel 6. The inner cavity of the lens barrel 6 is provided with two first accommodating grooves 601 for accommodating the two first threaded holes 401 on the outer edge of the first support 4. To avoid a gap formed when the first support 4 is assembled into the lens barrel 6, a sealing member 17 can be used to fill the gap.

[0105] Each first accommodating groove 601 is bonded and fixed with the baffle 18, which is used to block the bottom of the first accommodating groove 601 to prevent the lead screw 10 from being pulled out as a whole. Referring to Figure 4 A through hole 1801 is formed in the center of the baffle 18, and the lower part of the lead screw 10 can pass through the through hole 1801 to penetrate the baffle 18. The lower end of the lead screw 10 can be inserted into the gear shaft position of the double-layer gear 11.

[0106] In some examples of the present application, referring to Figures 5 to 8The main driving rod 7 and the two driven rods 8 are provided as screw rods 10; the outer edge of the first support 4 is provided with three second threaded holes 402, the screw rod 10 is inserted into the second threaded hole 402 and is threadedly connected with the second threaded hole 402 through the thread segment 1001 of the screw rod 10; the inner wall of the lens barrel 6 is provided with a second accommodating groove 603, the second threaded hole 402 is located in the second accommodating groove 603, and the second threaded hole 402 is provided in one-to-one correspondence with the second accommodating groove 603; the second accommodating groove 603 is provided with a baffle 18, and the screw rod 10 extends out of the through hole 1801 on the baffle 18 and is connected with the driven gear or the driving gear.

[0107] The above example provides a three-point pushing type transmission structure design. The main driving rod 7 and the two driven rods 8 are provided as screw rods 10, that is, three screw rods 10 are designed. Referring to Figure 8 and Figure 12 Each screw rod 10 is partially formed with a thread segment 1001, and the thread segments 1001 of the three screw rods 10 can be threadedly connected with the three second threaded holes 402 provided on the first support 4 in a threadedly transmission matching relationship. This three-point transmission mode has higher reliability and more stable movement.

[0108] The whole transmission process is as follows: Figure 8 The focusing element 14 rotates and drives the main driving rod 7 and the driving gear to rotate together, the main driving rod 7 is a screw rod 10 with a thread segment 1001; the driving gear drives two driven gears to rotate synchronously through the first transmission belt 12 and the second transmission belt 13, the two driven gears can drive two screw rods 10 to rotate, and the thread segments 1001 of the three screw rods 10 can be threadedly connected with the three second threaded holes 402 on the first support 4; with the synchronous rotation of the three screw rods 10, the first support 4 can carry the first lens 1 to move linearly along the axis of the lens barrel 6. Since the three screw rods 10 cooperatively drive the first lens 1 to move, the first lens 1 has higher reliability and is less likely to be stuck due to lens tilting. The axial movement of the first lens 1 is very smooth, and the user experience is good.

[0109] Optionally, referring to Figure 8 The outer side of the second threaded hole 402 is provided with a second clamping groove 4021, and the second clamping groove 4021 is provided with a sealing element 17.

[0110] Specifically, three sealing elements 17 can be designed, which are, for example, sealing rings, and can be respectively sleeved in the second clamping groove 4021 on the outer side of the second threaded hole 402.

[0111] In the process of assembling the optical module, the first lens 1 can be fixedly connected in the first holder 4, and then the first holder 4 is assembled in the inner cavity of the lens barrel 6. Three second accommodating grooves 603 are reserved in the inner cavity of the lens barrel 6, which can be used to accommodate the three second threaded holes 402 on the outer edge of the first holder 4. In order to avoid the gap formed by the assembly of the first holder 4 into the lens barrel 6, a sealing member 17 can be used to fill the gap.

[0112] Each first accommodating groove 601 is fixedly connected with the baffle 18, and the baffle 18 is used to block the bottom of the first accommodating groove 601 to prevent the whole screw rod 10 from falling out, as shown in Figure 8 A through hole 1801 is formed in the center of the baffle 18, and the lower part of the screw rod 10 can pass through the through hole 1801 to protrude out of the baffle 18. The lower end of the screw rod 10 can be inserted into the double-layer gear 11.

[0113] In some examples of the present application, as shown in Figure 3 , Figure 6 and Figure 13 , the optical module further comprises a protective cover 15, which is arranged on one end of the lens barrel 6. The protective cover 15 has a containing space, and the driving gear, the driven gear, the first transmission belt 12 and the second transmission belt 13 are located in the containing space.

[0114] The protective cover 15 can be used to protect the transmission structure between the lens barrel 6 and the first holder 4 / first lens 1, and at the same time, it can make the optical module look more simple and have better integrity.

[0115] The protective cover 15 is arranged, for example, on the end of the lens barrel 6 where the display screen is arranged. Specifically, when the optical module is in use, the protective cover 15 is located away from the human eye.

[0116] The driving rod 7 is inserted into the gear shaft of the driving gear and passes through the protective cover 15, and the driving rod 7 is fixed by the first fastener outside the protective cover 15. The driven rod 8 is inserted into the gear shaft of the driven gear and passes through the protective cover 15, and the driven rod 8 is fixed by the second fastener outside the protective cover 15.

[0117] The driving rod 7 and the two driven rods 8 need to be fixedly connected with the protective cover 15 to make the transmission process stable and smooth. The first fastener and the second fastener can have the same structure, for example, which is convenient to assemble.

[0118] Optionally, the first fastener and the second fastener are both provided as a clasp 16, see Figure 14 The clasp 16 includes a body 1601 and an opening 1602 provided at one side of the body 1601, the body 1601 is annular and an engaging portion 1603 is formed inside and communicates with the opening 1602.

[0119] The clasp 16 described above is a sheet structure, simple structure and easy to disassemble.

[0120] For example, the lower end of the driving rod 7 is inserted into the gear shaft of the driving gear and passes through the protective cover 15, the driving rod 7 is fixed outside the protective cover 15 by the clasp 16, specifically, the driving rod 7 can enter the engaging portion 1603 from the opening 1602 to fix the lower end of the driving rod 7 passing through the protective cover 15.

[0121] In some examples of the present application, the lens group in the optical module further includes a second lens 2, the second lens 2 is arranged in the second support 5, the second support 5 is arranged at the end of the lens barrel away from the protective cover 15; the second lens 2 is arranged as a cut-edge lens, the first lens 1 and the second lens 2 both have at least one lens cut edge, the lens cut edges of the first lens 1 and the second lens 2 correspond to each other; the side of the second support 5 has a cut-edge side matched with the lens cut edge of the second lens 2.

[0122] For example, the second lens 2 is arranged at one end of the lens barrel, specifically, in the use state of the optical module, the second lens 2 is arranged close to the human eye.

[0123] The optical module provided by the embodiments of the present application is not limited to only arranging a movable first lens 1, but also can arrange a fixed lens on or in the lens barrel to cooperate with the first lens 1 to improve the imaging quality. The second lens 2 can also ensure the interpupillary distance.

[0124] When other cut-edge lenses are arranged in the optical module, the cut edges of the lenses should be matched when assembling the optical module. When the lenses applied in the optical module are cut-edge lenses, the lens barrel carrying the lenses also forms a non-integer circular structure, which can avoid the nose bridge area or the brow bone area of the user in the appearance, and is beneficial to the product appearance optimization design of the VR device such as VR smart glasses.

[0125] On the basis of the above examples, optionally, the lens group of the optical module further comprises a third lens 3, one end of the third lens 3 is provided with the protective cover 15 close to the lens barrel 6, and the protective cover 15 is located outside the third lens 3, and the avoiding area 1501 corresponding to the third lens 3 is formed on the protective cover 15; the first lens 1 is movably arranged between the second lens 2 and the third lens 3, and the first lens 1, the second lens 2 and the third lens 3 are located on the same optical axis.

[0126] Among them, the third lens 3 can be a cut edge lens, or a traditional circular lens, which is not limited in the present application.

[0127] The first lens 1, the second lens 2 and the third lens 3 cooperate with each other, so that the optical module has two fixed lenses and one movable first lens 1, by controlling the moving range of the first lens 1, the distance between the first lens 1 and the second lens 2 and / or the third lens 3 can be adjusted, so that the refractive power can be adjusted while ensuring good imaging quality.

[0128] Among them, the third lens 3 is close to one side of the protective cover 15, that is, close to the light emitting side of the display screen, in order to avoid blocking the imaging light emitted by the display screen, the above avoiding area 1501 of the light is also arranged on the protective cover 15, see Figure 13 .

[0129] According to another aspect of the embodiment of the present application, a wearable device is also provided, which comprises a shell and an optical module as described above, and the optical module is arranged in the shell.

[0130] The wearable device is, for example, a VR head-mounted device, including a VR glasses or a VR helmet, etc., and the embodiment of the present application does not make specific limitation.

[0131] For example, the shell is a mirror frame, and two mirror frames are arranged on the mirror frame; the optical module is arranged as two, and the two optical modules are arranged in the two mirror frames.

[0132] The specific implementation of the head-mounted display device of the embodiment of the present application can refer to the above-mentioned optical module embodiments, and therefore has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0133] In the above embodiments, the differences between the various embodiments are mainly described, and the optimization features different between the various embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. Considering the brevity of the writing, it will not be repeated here.

[0134] While certain embodiments of the application have been described herein in detail, those skilled in the art will appreciate that modifications can be made without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. An optical module characterized by comprising: The optical module comprises: a lens set comprising at least a first lens (1) which is a cut-edge lens; a lens barrel (6) in which the first lens (1) is movably arranged; a driving rod (7) and two driven rods (8) which are rotatably arranged in the lens barrel (6), the periphery of the first lens (1) is in threaded transmission with at least the two driven rods (8), the driving rod (7) is connected with a driving gear, the driven rods (8) are connected with driven gears, the driving gear and the driven gears are both double-layer gears (11) comprising coaxially arranged first gears (1101) and second gears (1102); a first transmission belt (12) and a second transmission belt (13), the first transmission belt (12) is arranged outside the first gears (1101) of the driving gear and one of the driven gears, and the second transmission belt (13) is arranged outside the second gears (1102) of the driving gear and the other driven gear; a focusing member (14) connected with the driving rod (7); when focusing, the focusing member (14) is rotated, the driving rod (7) drives the driven rods (8) to rotate relative to the lens barrel (6) at the same time, so that the first lens (1) moves axially relative to the lens barrel (6) under the threaded transmission to match the refractive power of a target object; the optical module further comprises a protective cover (15) arranged at one end of the lens barrel (6); the protective cover (15) has a containing space, and the driving gear, the driven gears, the first transmission belt (12) and the second transmission belt (13) are located in the containing space; the driving rod (7) is inserted into the gear shaft of the driving gear and passes through the protective cover (15), and the driving rod (7) is fixed outside the protective cover (15) by a first fastener; the driven rods (8) are inserted into the gear shafts of the driven gears and pass through the protective cover (15), and the driven rods (8) are fixed outside the protective cover (15) by a second fastener.

2. The optical module according to claim 1, wherein the first lens (1) is arranged in a first support (4), and the side of the first support (4) has a cut-edge side matched with the lens cut edge of the first lens (1).

3. The optical module according to claim 2, wherein the driving rod (7) is arranged as a rotating shaft (9), and the two driven rods (8) are arranged as lead screws (10); the outer edge of the first support (4) is provided with two opposite first threaded holes (401), the lead screws (10) are inserted into the first threaded holes (401) and are threadedly connected with the first threaded holes (401) through the threaded segments (1001) of the lead screws (10); first containing grooves (601) and first assembly holes are arranged on the inner wall of the lens barrel (6), the first containing grooves (601) and the first threaded holes (401) are arranged in one-to-one correspondence, and the first threaded holes (401) are located in the first containing grooves (601). The first accommodating groove (601) is provided with a baffle (18), the lead screw (10) extends from a through hole (1801) on the baffle (18) and is connected with the driven gear; The rotating shaft (9) is inserted into the first assembly hole and connected with the driving gear.

4. The optical module according to claim 3, wherein The outer side of the first threaded hole (401) is provided with a first clamping groove (4011), and the first clamping groove (4011) is provided with a sealing element (17).

5. The optical module according to claim 2, wherein The driving rod (7) and the two driven rods (8) are both lead screws (10). The outer edge of the first support (4) is provided with three second threaded holes (402), the lead screw (10) is inserted into the second threaded hole (402) and is screwed with the second threaded hole (402) through its threaded segment (1001); The inner wall of the lens barrel (6) is provided with a second accommodating groove (603), the second accommodating groove (603) is provided in one-to-one correspondence with the second threaded hole (402), and the second threaded hole (402) is located in the second accommodating groove (603); The second accommodating groove (603) is provided with a baffle (18), the lead screw (10) extends from a through hole (1801) on the baffle (18) and is connected with the driven gear or the driving gear.

6. The optical module according to claim 5, wherein The outer side of the second threaded hole (402) is provided with a second clamping groove (4021), and the second clamping groove (4021) is provided with a sealing element (17).

7. The optical module according to claim 1, wherein The first fastener and the second fastener are both clamping springs (16), the clamping spring (16) includes a body (1601) and an opening (1602) provided on one side of the body (1601), the body (1601) is annular and forms a clamping portion (1603) in communication with the opening (1602) inside.

8. The optical module according to claim 1, wherein The lens group further comprises a second lens (2), the second lens (2) is arranged in a second support (5), and the second support (5) is arranged at one end of the lens barrel away from the protective cover (15); The second lens (2) is arranged as a cut-edge lens, the first lens (1) and the second lens (2) both have at least one lens cut edge, and the lens cut edges of the first lens (1) and the second lens (2) correspond to each other; The side of the second support (5) has a cut-edge side matched with the lens cut edge of the second lens (2).

9. The optical module according to claim 8, wherein The lens group further comprises a third lens (3), the third lens (3) is arranged at one end of the lens barrel (6) close to the protective cover (15), and the protective cover (15) is located outside the third lens (3) and forms an avoiding area (1501) corresponding to the third lens (3) on the protective cover (15); The first lens (1) is movably arranged between the second lens (2) and the third lens (3), and the first lens (1), the second lens (2) and the third lens (3) are located on the same optical axis.

10. A wearable device, comprising: It comprises: A shell; And The optical module according to any one of claims 1-9 is arranged in the shell.

11. The wearable device of claim 10, wherein, The shell is a mirror frame, two mirror frames are arranged on the mirror frame, and two optical modules are arranged in the two mirror frames.

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