Strap adjustment mechanism and head-mounted smart device

Abstract

The strap adjustment mechanism and head-mounted smart device provided by the embodiment of the present invention, wherein the strap adjustment mechanism includes: a housing, a strap, a strap driving device, an input unit, a controller and a locking device; a part of the strap is fixed in the housing to form a fixed part, and the other part of the strap extends out of the housing to be worn on the user's head to form a wearing part; the input unit is used for the user to input a strap adjustment instruction; the strap driving device is connected to the strap transmission, and is used to drive the strap to move to adjust the length distribution ratio of the fixed part and the wearing part; the controller is connected to the input unit and the strap driving device, and is used to control the strap driving device to drive the strap to move according to the strap adjustment instruction input by the user; the locking device is installed in the housing, and is used to provide a squeezing force to the strap to fix the strap. The technical solution provided by the embodiment of the present invention can realize the function of the strap of the head-mounted smart device to automatically adjust the wearing length, and the adjustment is convenient and the user experience is good.

Description

Technical Field

[0001] The present invention relates to the technical field of smart devices, and in particular to a strap adjustment mechanism and a head-mounted smart device. Background Art

[0002] Head-mounted smart devices refer to devices that are worn on the user's head and are intelligently designed, such as VR (virtual reality) glasses, AR (augmented reality) glasses, etc.

[0003] Common head-mounted smart devices are fixed to the user's head through straps and strap buckles. The fabric of the strap buckle is tightened by magic hooks to increase the tightening force and play a fixing role. Alternatively, a plastic headband gear locking mechanism is used in combination with foam and PU to play a fixing role.

[0004] The above method requires manual adjustment of the straps each time the head-mounted device is worn, which is complicated to operate and does not provide a good user experience. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to solve the above problems or at least partially solve the above problems, including a strap adjustment mechanism and a head-mounted smart device.

[0006] One aspect of an embodiment of the present invention provides a strap adjustment mechanism, comprising:

[0007] case;

[0008] A strap, a portion of which is fixed in the shell to form a fixing portion, and another portion of which extends out of the shell to be worn on the user's head to form a wearing portion;

[0009] A strap driving device, which is in transmission connection with the strap and is used to drive the strap to move so as to adjust the length distribution ratio between the fixing portion and the wearing portion;

[0010] An input unit, used for the user to input strap adjustment instructions;

[0011] A controller connected to the input unit and the strap driving device, and configured to control the strap driving device to drive the strap to move according to a strap adjustment instruction input by a user;

[0012] A locking device is installed in the housing and is used to provide a squeezing force to the strap to fix the strap.

[0013] Further, the locking device includes a locking bracket and a locking member;

[0014] The locking bracket includes a mounting portion, a force-applying portion and a matching portion, wherein the mounting portion is rotatably connected to the housing via a rotating shaft, and the force-applying portion is used to apply a squeezing force to the binding strap;

[0015] The locking device includes a locked state and an unlocked state. In the locked state, the locking member cooperates with the matching portion to prevent the mounting portion from rotating in the direction of releasing the strap; in the unlocked state, the locking member releases the matching portion to allow the mounting portion to rotate.

[0016] Furthermore, it also includes an elastic member, one end of the locking member is used to cooperate with the matching portion, the other end of the locking member is connected to one end of an elastic member, and the other end of the elastic member is connected to the shell.

[0017] Furthermore, it also includes an elastic pad, which is fixed on the shell, and the force-applying part is used to press the strap onto the elastic pad.

[0018] Further, the strap driving device includes a motor, a first roller and a second roller;

[0019] The first roller is fixedly connected to the output shaft of the motor, the strap is clamped relatively by the first roller and the second roller, the motor drives the first roller to rotate, the first roller drives the second roller to rotate, and drives the strap to move.

[0020] Furthermore, the first roller and / or the second roller is a flexible roller.

[0021] Furthermore, the first roller is fixedly connected to the output shaft of the motor via a roller shaft.

[0022] Furthermore, it also includes a strap storage device, and a strap storage bracket can be provided in the housing, and a slide groove is provided on the strap storage bracket, and the strap storage device is slidably arranged in the slide groove;

[0023] The strap storage device can be extended and retracted along the length direction of the slide slot, and the strap is wound around the strap storage device along the length direction of the slide slot.

[0024] Furthermore, the strap storage device comprises: an intermediate elastic body and an elastic body fixing seat;

[0025] Elastic body fixing seats are respectively provided at both ends of the middle elastic body, and the strap storage device is slidably arranged in the sliding groove through the elastic body fixing seats.

[0026] Furthermore, a touch switch is provided on the shell or the strap storage bracket and located near the two ends of the strap storage device. The touch switch is connected to the controller. When the two ends of the strap storage device touch the touch switch, the touch switch generates a trigger signal to prompt the user that the length of the wearing part of the current strap is a preset length. The controller controls the strap driving device to stop working according to the trigger signal.

[0027] Furthermore, it also includes a reset operation unit, which is connected to the controller and is used to receive a reset command input by a user. The controller controls the strap driving device to drive the strap to move until the length of the wearing part reaches a preset length according to the reset command.

[0028] Another aspect of an embodiment of the present invention further provides a head-mounted smart device, including an optical body and a strap adjustment mechanism as described above, wherein a wearing portion of the strap is connected to the optical body.

[0029] The strap adjustment mechanism and head-mounted smart device provided by the embodiments of the present invention, the strap includes a fixing part fixed in the shell and a wearing part extending from the shell, the strap is connected to the strap transmission through a strap driving device, and the controller is connected to the strap driving device. The controller controls the strap driving device to drive the strap to move according to the strap adjustment command input by the user, adjusts the length distribution ratio between the fixing part and the wearing part, that is, adjusts the length of the wearing part, and fixes the strap to the state of the adjusted wearing part length through a locking device, thereby realizing the function that the wearing part length of the strap can be automatically adjusted. Compared with the manual adjustment method of the prior art, the adjustment is convenient and the user experience is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a head-mounted smart device provided by an embodiment of the present invention;

[0032] Figure 2 An exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention;

[0033] Figure 3 is a partial exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention in an unlocked state;

[0034] Figure 4is a partial exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention in a locked state;

[0035] Figure 5 is a cross-sectional view of a head-mounted smart device provided by an embodiment of the present invention;

[0036] Figure 6 is a partial cross-sectional view of a strap adjustment mechanism provided by an embodiment of the present invention;

[0037] Figure 7 is a structural schematic diagram of a strap storage device and an optical body in a strap adjustment mechanism according to an embodiment of the present invention;

[0038] Figure 8 1 is a schematic diagram of the electrical control principle of the strap adjustment mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] The term "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to". "Substantially" means that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0041] In addition, the word "connection" includes any direct and indirect means of connection. Therefore, if a first device is described as being connected to a second device, it means that the first device can be directly connected to the second device, or indirectly connected to the second device through other devices. The following description is a preferred embodiment of the present invention, but the description is for the purpose of illustrating the general principles of the present invention and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0042] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] Embodiment 1

[0044] Figure 1A schematic diagram of the structure of a head-mounted smart device provided by an embodiment of the present invention; Figure 2 An exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention; Figure 3 is a partial exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention in an unlocked state; Figure 4 is a partial exploded schematic diagram of a head-mounted smart device provided by an embodiment of the present invention in a locked state; Figure 8 1 is a schematic diagram of the electrical control principle of the strap adjustment mechanism according to an embodiment of the present invention.

[0045] A head-mounted smart device can generally be worn on the user's head through a strap. This embodiment aims to solve the technical problem of manually adjusting the length of the strap in the prior art, and provides a strap adjustment mechanism that can automatically adjust the length of the strap. Figure 1-Figure 4 As shown, the strap adjustment mechanism provided in this embodiment includes: a housing 10 , a strap 20 , a strap driving device 30 , an input unit 40 , a controller 50 and a locking device 60 .

[0046] The housing 10 may include an upper housing 11 and a lower housing 12, and the upper housing 11 and the lower housing 12 may be buckled together to form the housing 10. The upper housing 11 and the lower housing 12 may be buckled together to form a cavity.

[0047] A portion of the strap 20 is fixed in the housing 10 to form a fixed portion 21, and another portion of the strap 20 extends out of the housing 10 to be worn on the user's head to form a wearing portion 22. The strap driving device 30 is in transmission connection with the strap 20, and is used to drive the strap 20 to move so as to adjust the length distribution ratio of the fixed portion 21 and the wearing portion 22. When the user wears the head-mounted smart device, the portion in contact with the head includes the wearing portion 22 of the strap 20 and the surface of the housing 10 in contact with the user's head.

[0048] Since the surface of the shell 10 that contacts the user's head has been determined and cannot be changed, in this embodiment, the length of the strap 20 is adjusted according to the size of the user's head circumference, that is, the length of the wearing portion 22 is adjusted. For the strap driving device 30, the length distribution ratio of the fixing portion 21 and the wearing portion 22 is adjusted. Specifically, the strap driving device 30 can drive a part of the wearing portion 22 of the strap 20 exposed outside the shell 10 to retract into the shell 10, thereby increasing the length of the fixing portion 21 in the shell 10, and correspondingly, the length of the wearing portion 22 is reduced. The strap driving device 30 can also drive a part of the fixing portion 21 of the strap 20 built into the shell 10 to extend from the shell 10, thereby reducing the length of the fixing portion 21 in the shell 10, and correspondingly, the length of the wearing portion 22 is increased. For example, if in the initial state, the length of the strap 20 stored in the shell 10 is 10 cm, and the length of the part extending from the shell 10 for wearing on the user's head is 20 cm, that is, the length of the fixing part 21 is 10 cm, and the length of the wearing part is 20 cm. If the strap driving device 30 drives the strap 20 to extend 5 cm more from the shell 10, then the length of the fixing part 21 becomes 5 cm, and the corresponding length of the wearing part 20 becomes 25 cm.

[0049] Preferably, in order to ensure the stability and balance of the head-mounted smart device, there may be two strap driving devices 30, and the wearing portion 20 may include a left wearing portion 21 and a right wearing portion 22, and the left wearing portion 21 and the right wearing portion 22 extend from both sides of the housing 10, respectively. If it is necessary to drive the strap 20 to extend 5 cm more from the housing 10, one of the strap driving devices 30 may drive the fixing portion 21 to extend 2.5 cm more from the left side of the housing 10, and the other strap driving device 30 may drive the fixing portion 21 to extend 2.5 cm more from the right side of the housing 10.

[0050] The input unit 40 is used for the user to input the strap adjustment instruction; the controller 50 is connected to the strap driving device 60, and is used to control the strap driving device 60 to drive the strap 20 to move according to the strap adjustment instruction input by the user. Specifically, the input unit 40 can be a terminal device, and the terminal device is connected to the controller 50 for communication. Of course, the input unit 40 can also be directly set on the head-mounted smart device.

[0051] The locking device 60 is installed in the housing 10, and is used to provide a squeezing force to the strap 20 to fix the strap 20. After the strap driving device 60 drives the strap 20 to adjust the wearing portion 22 to the desired length, the user can activate the locking device 60 to lock the strap 20 so that the strap 20 is maintained at the desired length of the wearing portion 22, and the strap adjustment is completed. Furthermore, the controller 50 of the strap adjustment mechanism can store the current length distribution ratio of the fixing portion 21 and the wearing portion 22 of the strap 20, that is, it can store the data of the length of the wearing portion 22, and the strap adjustment mechanism can automatically adjust to the state of the last use when the user uses the head-mounted smart device next time.

[0052] The strap adjustment mechanism provided in the present embodiment comprises a strap including a fixing portion fixed in a shell and a wearing portion extending from the shell, which is connected to the strap transmission via a strap driving device, and a controller connected to the strap driving device. The controller controls the strap driving device to drive the strap to move according to a strap adjustment instruction input by a user, thereby adjusting the length distribution ratio between the fixing portion and the wearing portion, i.e., adjusting the length of the wearing portion, and fixing the strap to a state of the adjusted wearing portion length via a locking device, thereby realizing the function that the wearing portion length of the strap can be automatically adjusted. Compared with the manual adjustment method of the prior art, the adjustment is convenient and the user experience is better.

[0053] Figure 5 is a cross-sectional view of a head-mounted smart device provided by an embodiment of the present invention; Figure 6 FIG. 2 is a partial cross-sectional view of a strap adjustment mechanism provided by an embodiment of the present invention. Figure 5 and Figure 6 As shown, based on the above embodiment, specifically, the locking device 60 may include a locking bracket 61 and a locking member 62 .

[0054] The locking bracket 61 may include a mounting portion 611, a force-applying portion 612, and a matching portion 613. The mounting portion 611 may be rotatably connected to the housing 10 via a rotating shaft 614. The force-applying portion 612 is used to apply a squeezing force to the strap 20. The locking bracket 61 may be L-shaped. A rotating shaft 614 may be provided at a corner of the L-shaped structure. The rotating shaft rotatably mounts the locking bracket 61 on the housing 10. The force-applying portion 612 and the matching portion 613 are respectively located on both sides of the mounting portion 611 to form a lever-like structure. The locking member 62 applies a resisting force to the matching portion 613. Under the action of the resisting force, the force-applying portion 612 can also press the strap 20 tightly and apply a squeezing force to the strap 20, thereby achieving the effect of fixing the strap 20.

[0055] The locking device 60 may include a locked state and an unlocked state. In the locked state, the locking member 62 cooperates with the matching portion 613 to prevent the mounting portion 611 from rotating in the direction of releasing the strap 20; in the unlocked state, the locking member 62 releases the matching portion 613 to allow the mounting portion 611 to rotate. Figure 6 As shown, the mounting portion 611 rotates clockwise to release the binding strap 20 , and the mounting portion 611 rotates counterclockwise to compress and fix the binding strap 20 .

[0056] Furthermore, the locking device 60 may further include an elastic member 63, one end of the locking member 62 is used to cooperate with the matching portion 613, the other end of the locking member 62 is connected to one end of an elastic member 63, and the other end of the elastic member 63 is connected to the housing 10. Specifically, the elastic member 63 may be an axial spring, or may be a rubber block, as long as it is an elastic object that can be axially retracted, and this embodiment does not limit it. By setting the elastic member 63, the cooperation between the locking member 62 and the matching portion 613 can be made tighter and more stable. When it is necessary to switch the locking device 60 to the unlocked state, the user can press the locking member 62 in the direction of compressing the elastic member 63, so that the locking member 62 withdraws from the cooperation with the matching portion 613, and the locking device 60 can rotate around the rotating shaft 614. At this time, the extrusion force applied by the force-applying portion 612 to the strap 20 will be reduced, and the locking device 60 is in the unlocked state. At this time, the strap 20 can be pulled, and the user can adjust the length distribution ratio of the fixing portion 21 and the wearing portion 22 of the strap 20.

[0057] like Figure 3 and Figure 4 As shown, after the adjustment of the strap 20 is completed, the locking bracket 61 can be rotated until the matching portion 613 and the locking member 62 are matched in place, and the strap 20 is fixed.

[0058] In addition, the strap adjustment mechanism may further include an elastic pad 70, which may be fixed on the housing 10, and the force applying portion 612 is used to press the strap 20 on the elastic pad 70. The elastic pad 70 may be pressed and deformed under the action of the pressing force, and the strap 20 is pressed on the elastic pad 70. Compared with the way that the strap 20 is pressed on the smooth surface of the housing 10, since the elastic pad 70 is elastic, it is easy to deform after being pressed, and the friction between the strap 20 and the elastic pad 70 is greater, so that the strap 20 can be firmly fixed, thereby improving the reliability of the strap adjustment mechanism.

[0059] like Figure 2 and Figure 5 As shown, the strap driving device 30 may include a motor 31, a first roller 32 and a second roller 33. The motor 31 may be a stepper motor, which has a small size, a long life, a simple structure and a relatively small weight, and is very suitable for use in head-mounted smart devices.

[0060] The first roller 32 can be fixedly connected to the output shaft of the motor 31, and the strap 20 can be relatively clamped by the first roller 32 and the second roller 33. The motor 31 drives the first roller 32 to rotate, and the first roller 32 drives the second roller 33 to rotate, and drives the strap 20 to move. The first roller 32 can be fixedly connected to the output shaft of the motor 31 through a roller shaft 321. In this embodiment, in order to save installation space, the first roller 32 and the second roller 33 can be arranged on the locking bracket 61. The roller shaft 321 transmits the torsional force of the motor 31 to the first roller 32. At the same time, the second roller 33 will generate a squeezing force on the strap 20, thereby providing a friction force, and the length of the strap 20 (i.e., the length of the wearing portion 22) can be adjusted under the rotation of the first roller 32.

[0061] The outer circumference of the first roller 32 may be toothed, and the surface of the strap 20 may cooperate with the toothed first roller 32 to achieve transmission. The first roller 32 and / or the second roller 33 are flexible rollers, thereby increasing the friction between the strap 20 and the first roller 32 and / or the second roller 33, making the strap 20 less likely to slip, which is beneficial to the transmission of the strap 20. In this embodiment, preferably, the first roller 32 is a metal roller and the second roller 33 is a flexible roller. In addition, as an optional method, in order to prevent the strap 20 from slipping, the first roller 32 and / or the second roller 33 may also be a plastic roller.

[0062] It is understandable that the strap driving device 30 can also be in other forms. For example, the middle position of the strap 20 is fixed on a rotating shaft, and the rotating shaft can be fixedly connected to the output shaft of a rotating driving component such as a motor. The rotating driving component directly drives the rotating shaft to rotate and drives the strap 20 to be wound around the rotating shaft, thereby achieving the purpose of adjusting the length of the strap 20.

[0063] Figure 7 is a structural schematic diagram of a strap storage device and an optical body in a strap adjustment mechanism according to an embodiment of the present invention; Figure 5 and Figure 7As shown, the strap adjustment mechanism provided in this embodiment may further include a strap storage device 70. A strap storage bracket 13 may be provided in the housing 10, a slide groove 13 is provided on the strap storage bracket 13, and the strap storage device 70 is slidably disposed in the slide groove 13. The strap storage device 70 can be extended and retracted along the length direction of the slide groove 13, and the strap 20 is wound around the strap storage device 70 along the length direction of the slide groove 13. Specifically, the slide groove 13 may be in a long strip shape, and the strap 20 may be wound around the strap storage device 70 in a zigzag shape, which can prevent the strap 20 from being entangled. There may be two strap storage devices 70, and correspondingly, there may also be two slide grooves 13, which are respectively matched with the strap storage devices 70. A certain distance is maintained between the two strap storage devices 70, and preferably, the distance between the two may be equal to the width of the strap 20, so as to ensure the flatness of the strap 20 when stored to the greatest extent.

[0064] The strap storage bracket 13 is used to support the entire strap storage device 70. The strap storage bracket 13 can be detachably fixed to the housing 10, for example, in this embodiment, it is fixed to the lower housing 12 by four screws.

[0065] like Figure 5 As shown, the strap storage device 70 may specifically include: an intermediate elastic body 71 and an elastic body fixing seat 72; elastic body fixing seats 72 may be provided at both ends of the intermediate elastic body 71, and the strap storage device 70 is slidably disposed in the slide groove 13 through the elastic body fixing seats 72. The elastic body fixing seat 72 may include a sliding shaft 73, and the sliding shaft 73 is slidably disposed in the slide groove 13. The intermediate elastic body 71 provides elastic force between the elastic body fixing seats 72, and the intermediate elastic body 71 may be an axial spring. If the strap 20 is pulled, under the action of the intermediate elastic body 71, the two elastic body fixing seats 72 may be relatively close. Once the pull on the strap 20 is released, the elastic body fixing seats 72 may restore their deformation under the action of the intermediate elastic body 71, so as to ensure that the strap 20 is unfolded to the flattest state as much as possible to prevent winding.

[0066] like Figure 7As shown, a touch switch 80 may be provided on the housing 10 or the strap storage bracket 13 and located near the two ends of the strap storage device 70. The touch switch 80 may be connected to the controller 50. When the two ends of the strap storage device 70 touch the touch switch 80, the touch switch 80 generates a trigger signal to prompt the user that the length of the wearing portion 22 of the current strap 20 is the preset length, and the controller 50 may control the strap driving device 30 to stop working according to the trigger signal. Specifically, the user may preset the length of the wearing portion 22, and may preset the following corresponding relationship: when the wearing portion 22 is at the preset length, the two ends of the strap storage device 70 are in contact with the touch switch 80. If after long-term use or when it is found that the length of the wearing portion 22 of the strap 20 deviates, for example, it is found that the length of the wearing portion 22 is 5 cm longer than the preset length, then correspondingly, it is indicated that the length of the fixing portion 21 in the housing 10 is reduced by 5 cm.

[0067] Furthermore, a reset operation unit 90 may be included, which is connected to the controller 50 and is used to receive a reset command input by the user. The controller 50 controls the strap driving device 30 to drive the strap 20 to move until the length of the wearing portion 22 is a preset length according to the reset command. The reset operation unit 90 may be a key area set on the housing 10. When the user finds that the length of the wearing portion 22 does not match the preset length, the reset operation unit 90 may be triggered, that is, a reset command is issued. The controller 50 receives the signal of the reset command and controls the strap driving device 30 to operate according to the reset command to adjust the length distribution ratio of the strap 20. During the adjustment process, the strap storage device 70 slides in the slide groove 13. When the two ends of the strap storage device 70 touch the touch switch 80, the touch switch 80 sends a trigger signal to indicate that the strap 20 has been adjusted to the preset length of the wearing portion 22. The strap driving device 30 can stop working, and the user can use the locking device 60 to lock the strap 20.

[0068] Embodiment 2

[0069] This embodiment provides a head-mounted smart device, such as Figure 1 As shown, it includes an optical body 100 and a strap adjustment mechanism 200 as provided in the first embodiment, and the wearing portion 22 of the strap 20 is connected to the optical body 100. A plurality of optical components may be provided in the optical body 100, and a sponge block 300 may be provided inside the strap adjustment mechanism 200, and the sponge block 300 contacts the user's head to increase wearing comfort.

[0070] The structure and function of the strap adjustment mechanism in the head-mounted smart device provided in this embodiment are the same as those in Embodiment 1. Please refer to Embodiment 1 for details, and this embodiment will not be repeated here.

[0071] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A strap adjustment mechanism, characterized in that: include: A housing, comprising an upper housing and a lower housing, wherein the upper housing and the lower housing are buckled with each other; A strap, a portion of which is fixed in the shell to form a fixing portion, and another portion of which extends out of the shell to be worn on the user's head to form a wearing portion; A strap driving device, which is in transmission connection with the strap and is used to drive the strap to move so as to adjust the length distribution ratio between the fixing portion and the wearing portion; An input unit, used for the user to input strap adjustment instructions; A controller connected to the input unit and the strap driving device, and configured to control the strap driving device to drive the strap to move according to a strap adjustment instruction input by a user; A locking device, installed in the housing, for providing a squeezing force to the strap to fix the strap; A strap storage device, wherein a strap storage bracket may be provided in the housing, and a slide groove is provided on the strap storage bracket; The strap storage device can be extended and retracted along the length direction of the slide slot, and the strap is wound around the strap storage device along the length direction of the slide slot.

2. The strap adjustment mechanism according to claim 1, characterized in that: The locking device comprises a locking bracket and a locking member; The locking bracket includes a mounting portion, a force-applying portion and a matching portion, wherein the mounting portion is rotatably connected to the housing via a rotating shaft, and the force-applying portion is used to apply a squeezing force to the binding strap; The locking device includes a locked state and an unlocked state. In the locked state, the locking member cooperates with the matching portion to prevent the mounting portion from rotating in the direction of releasing the strap; in the unlocked state, the locking member releases the matching portion to allow the mounting portion to rotate.

3. The strap adjustment mechanism according to claim 2, characterized in that: The locking device further comprises an elastic member, one end of which is used to cooperate with the matching portion, the other end of which is connected to one end of an elastic member, and the other end of which is connected to the housing.

4. The strap adjustment mechanism according to claim 2 or 3, characterized in that: It also includes an elastic pad, which is fixed on the shell, and the force-applying part is used to press the strap onto the elastic pad.

5. The strap adjustment mechanism according to claim 1, characterized in that: The strap driving device comprises a motor, a first roller and a second roller; The first roller is fixedly connected to the output shaft of the motor, the strap is clamped relatively by the first roller and the second roller, the motor drives the first roller to rotate, the first roller drives the second roller to rotate, and drives the strap to move.

6. The strap adjustment mechanism according to claim 5, characterized in that: The first roller and / or the second roller are flexible rollers.

7. The strap adjustment mechanism according to claim 5, characterized in that: The first roller is fixedly connected to the output shaft of the motor via a roller shaft.

8. The strap adjustment mechanism according to claim 1, characterized in that: The strap storage device comprises: an intermediate elastic body and an elastic body fixing seat; Elastic body fixing seats are respectively provided at both ends of the middle elastic body, and the strap storage device is slidably arranged in the sliding groove through the elastic body fixing seats.

9. The strap adjustment mechanism according to any one of claims 1 to 8, characterized in that: A touch switch is provided on the shell or the strap storage bracket and is located near the two ends of the strap storage device. The touch switch is connected to the controller. When the two ends of the strap storage device touch the touch switch, the touch switch generates a trigger signal to prompt the user that the length of the wearing part of the current strap is a preset length. The controller controls the strap driving device to stop working according to the trigger signal.

10. The strap adjustment mechanism according to claim 9, characterized in that: It also includes a reset operation unit, which is connected to the controller and is used to receive a reset command input by a user. The controller controls the strap driving device to drive the strap to move until the length of the wearing part reaches a preset length according to the reset command.

11. A head-mounted smart device, comprising an optical body, characterized in that: It also includes a strap adjustment mechanism as described in any one of claims 1 to 8, wherein a wearing portion of the strap is connected to the optical body.

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