Miniature ultrasonic driver suitable for AR glasses

Abstract

The utility model relates to the technical field of miniature ultrasonic drivers, in particular to a miniature ultrasonic driver suitable for AR glasses, which comprises a shell, slideways are arranged at two ends of the shell, sliding blocks are arranged in the slideways, a sliding body is arranged between the two sliding blocks, a driving shaft is arranged in the middle of the sliding body, and the driving shaft is connected with the shell. The driving shaft comprises a left-handed rotation driving part and a right-handed rotation driving part, driving devices are arranged at the bottoms of the left-handed rotation driving part and the right-handed rotation driving part, inertial motion of the self-centering rotor and the driving shaft is reduced, excessive motion is reduced, and the motion precision of the driver is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to small ultrasonic driver technical field, concretely relates to a small ultrasonic driver suitable for AR glasses. BACKGROUND

[0002] The ultrasonic motor is a new type of driver based on the ultrasonic frequency vibration of piezoelectric ceramics, breaks the design concept that the traditional motor obtains the rotating speed and torque by electromagnetic effect, and the ultrasonic driver is a typical mechatronics product, which is composed of a motor driver body and a control driving circuit, compared with the traditional motor, the ultrasonic motor is small in noise, free from electromagnetic interference and not interfered by electromagnetic interference, but in the use of controlling the movement of the lens barrel of AR glasses, it is found that the ultrasonic driver needs to be processed into a smaller device, and in the use, it is found that there is a small excess motion when stopping, which causes errors in action execution, although it can be compensated by a control algorithm, but it needs to be calibrated every interval, and there are certain disadvantages in use, therefore the technical scheme is proposed to improve. SUMMARY

[0003] The utility model discloses a small ultrasonic driver suitable for AR glasses, which overcomes the excess motion of the driver used in the AR glasses in the prior art.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model specifically adopts the following technical scheme: a small ultrasonic driver suitable for AR glasses, comprising a shell, two ends of the shell are provided with sliding ways, the inside of the sliding way is provided with a sliding block, a sliding body is arranged between the two sliding blocks, a driving shaft is arranged at the middle position of the sliding body, the driving shaft comprises a left-handed driving part and a right-handed driving part, the left-handed driving part and the right-handed driving part are provided with a driving device at the bottom.

[0005] Further, the outer side of the sliding block is connected with the lens barrel, and the two sliding ways are arranged in parallel.

[0006] Further, the driving device comprises a stator arranged at the bottom of the left-handed driving part and the right-handed driving part, the stator comprises a driving tooth and a supporting ring, and the surface of the stator is provided with a piezoelectric material.

[0007] Further, the side of the stator is provided with a self-centering rotor, and the self-centering rotor is provided with two left-handed driving parts and right-handed driving parts connected respectively.

[0008] Further, the two ends of the self-centering rotor are provided with a pre-pressure adjusting device.

[0009] The utility model discloses an embodiment beneficial effect is: drive shaft includes left screw drive part and right screw drive part, two part designs as an organic whole but opposite screw direction, and equal pitch, when drive shaft rotates, can produce different movement effect, can control the moving direction of mirror barrel according to the use need, and use screw joint to realize the movement of sliding block, make the movement gap of sliding block be controlled by screw joint mode, make the cooperation gap greatly reduce, prevent over movement, and the stator includes drive tooth and support ring, and the surface of stator is provided with piezoelectric material, and piezoelectric material will produce ultrasonic frequency vibration under the action of specific voltage signal, and then drive the corresponding mechanical movement of stator, when the vibration of stator under the action of piezoelectric material, the self-centering rotor will rotate along with it, reduce the inertial motion of self-centering rotor and drive shaft, reduce the occurrence of excessive movement, guarantee the movement accuracy of driver. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is the whole structure schematic diagram of the utility model;

[0011] Fig. 2 It is the drive arrangement structure schematic diagram of the utility model;

[0012] In the drawing: 1, shell;101, slide;2, sliding block;201, sliding body;3, drive shaft;4, mirror barrel;5, drive arrangement;501, drive tooth;502, piezoelectric material;503, self-centering rotor;504, pre-pressure adjusting device. DETAILED DESCRIPTION

[0013] The preferred embodiments of the utility model will be described below with reference to the drawings, and those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0014] See Figs. 1-2The utility model discloses a kind of small micro ultrasonic drivers suitable for AR glasses, mainly including shell 1, slide 101, slider 2, sliding body 201, driving shaft 3 and driving device 5 etc.

[0015] The driving device 5 is arranged at the middle position of the driving shaft 3 at the bottom of the left and right driving parts, and is a key part for realizing the rotation of the driving shaft 3. The driving device 5 mainly comprises a stator and a self-centering rotor 503. The stator comprises a driving tooth 501 and a supporting ring. The surface of the stator is provided with a piezoelectric material 502. The piezoelectric material 502 will produce ultrasonic frequency vibration under the action of a specific voltage signal, and further drive the stator to produce corresponding mechanical movement. The stator is generally made of metal material, and other materials which can easily produce elastic deformation can also be selected. The piezoelectric material 502 is arranged on the surface of the stator by pasting or sintering, so as to ensure the good combination and stable energy transmission between the piezoelectric material 502 and the stator. The side of the stator is provided with the self-centering rotor 503. Two self-centering rotors 503 are arranged respectively and connected with the left and right driving parts. When the stator produces vibration under the action of the piezoelectric material 502, the self-centering rotor 503 will rotate. The two ends of the self-centering rotor 503 are provided with a pre-pressure adjusting device 504. The pre-pressure adjusting device 504 comprises a bearing, a disc spring and an elastic module. The pre-pressure between the self-centering rotor 503 and the stator can be accurately adjusted through the device, so as to ensure the good contact and stable power transmission between the two, and improve the operation accuracy and reliability of the driver.

[0016] During the working process, when the control circuit applies a specific voltage signal to the piezoelectric material 502 on the surface of the stator, the piezoelectric material 502 produces ultrasonic frequency vibration, and drives the stator to vibrate. The vibration of the stator is transmitted to the self-centering rotor 503 through the driving tooth 501, so that the self-centering rotor 503 starts to rotate. Since the self-centering rotor 503 is connected with the left and right driving parts of the driving shaft 3 respectively, when the self-centering rotor 503 rotates, the driving shaft 3 will rotate synchronously.

[0017] In order to ensure the stability and precision of the driver, the dimensional accuracy, surface roughness and assembly process of each component are strictly required and controlled during the design and manufacturing process. For example, the matching gap between the slide 101 and the slide block 2 needs to be accurately controlled to reduce friction and wear during movement, improve the stability and precision of movement, and the thread processing precision of the drive shaft 3 also needs to reach a high level to ensure that the nut slide block 2 can move accurately and smoothly. By optimizing the control algorithm and the design of the driving circuit, the movement process of the driver is accurately controlled. When the driver stops, the control circuit can quickly adjust the alternating signal applied to the piezoelectric material 502 to zero, so that the vibration of the stator stops quickly, thereby reducing the inertial movement of the self-centering rotor 503 and the drive shaft 3, reducing the occurrence of excessive movement, ensuring the movement precision of the driver, and ensuring that the AR glasses barrel 4 can be accurately positioned to the required position. The precise and stable driving of the AR glasses barrel 4 is achieved, which has the advantages of small noise, no electromagnetic interference, compact structure, easy industrialized production and the like, and provides strong technical support for the development of AR glasses.

[0018] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] In addition, it should be further pointed out that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] The term "includes" or any other similar term is intended to cover non-exclusive inclusion, so that the process, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent to the process, article or equipment / device.

[0021] The technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. The person skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A miniature ultrasonic actuator suitable for AR glasses, comprising a housing, characterized in that: Both ends of the outer shell are provided with slide rails, the slide rails are provided with sliders, and the sliders are provided with a sliding body between the two sliders. A drive shaft is provided at the middle position of the sliding body. The drive shaft includes a left-hand drive part and a right-hand drive part, and a drive device is provided at the bottom of the left-hand drive part and the right-hand drive part.

2. The miniature ultrasonic actuator for AR glasses according to claim 1, characterized in that: The outer side of the slider is connected to the mirror tube, and the two slides are arranged in parallel.

3. The miniature ultrasonic actuator for AR glasses according to claim 1, characterized in that: The driving device includes a stator disposed at the bottom of a left-hand drive section and a right-hand drive section. The stator includes drive teeth and a support ring, and the surface of the stator is provided with a piezoelectric material.

4. The miniature ultrasonic actuator for AR glasses according to claim 3, characterized in that: The stator is provided with a self-centering rotor on its side, and there are two self-centering rotors that are respectively connected to the left-hand drive unit and the right-hand drive unit.

5. The miniature ultrasonic actuator for AR glasses according to claim 4, characterized in that: The self-centering rotor is equipped with pre-pressure adjustment devices at both ends.

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