WO2024050890A1

WO2024050890A1 - Control method and control apparatus for visual function diagnosis and treatment vr device, and vr device

Info

Publication number: WO2024050890A1
Application number: PCT/CN2022/121595
Authority: WO
Inventors: 黄正衍; 樊斐斐; 赵威
Original assignee: 天津新视光技术有限公司
Priority date: 2022-09-09
Filing date: 2022-09-27
Publication date: 2024-03-14
Also published as: CN115413999A

Abstract

A control method and a control apparatus for a visual function diagnosis and treatment VR device, and a VR device. The control method for the visual function diagnosis and treatment VR device comprises the following steps: acquiring optotype image information on a display component; according to a preset time interval, controlling the distance between a first lens group (200) and a second lens group (300) to move at equal intervals or unequal intervals within a preset distance range. During adjustment, the optotype image on the display component can be imaged in human eyes by means of the first lens group (200) and the second lens group (300) in sequence, so as to form different adjustment stimuli for human eyes. The problems that the existing examination and training devices are complicated to operate, and have non-ideal examination and training effects and poor user experience can be alleviated.

Description

A control method, control device and VR equipment for visual function diagnosis and treatment VR equipment

Technical field

The present invention relates to the technical field of visual function testing or inspection, and in particular to a control method, control device and VR equipment for visual function diagnosis and treatment VR equipment.

Background technique

The current visual function examination and training equipment mainly provides artificial feedback on the visual function examination and training process through the user's subjective feelings, and then obtains the examination and training results. In the process of visual function examination and training, the existing technology mainly relies on small and medium-sized equipment to complete the process. In actual use, existing inspection and training equipment is large in size, takes up a lot of space, is not easy to carry, and is cumbersome to operate. The inspection and training results are not ideal and the user experience is poor.

In addition, the improvement of adjustment ability in the existing design mainly works through the perceptual adjustment driven by far and near perception and the collective adjustment during the gathering and dispersing training process. However, the aforementioned two types of adjustments are not active adjustments, and reactive adjustments, which account for the largest proportion of adjustments and can be greatly improved through training, cannot be trained.

Contents of the invention

Based on this, it is necessary to provide a control method, control device and VR equipment for visual function diagnosis and treatment VR equipment in order to solve the problems existing in the above-mentioned prior art.

In a first aspect, the present application provides a method for controlling a VR device for visual function diagnosis and treatment. The VR device includes a VR body, a display component for displaying an optotype image, and a plurality of lens groups, both of which are provided on the VR body. The lens groups are arranged at intervals in sequence and at least one of the lens groups is movable, wherein the control method includes the following steps:

Obtain visual target image information on the display component;

Control at least one of the plurality of lens groups to move within a preset distance range to change the optical power of the optical system composed of the plurality of lens groups. During the movement, the display component The optotype images on the target can be imaged in the human eye through multiple sets of the lens groups in sequence, so as to form different adjustment stimuli to the human eye.

Further, the plurality of lens groups include a first lens group and a second lens group;

The step of controlling at least one of the plurality of lens groups to move within a preset distance range specifically includes:

According to a preset time interval, control the distance between the first lens group and the second lens group to move at equal or non-equal intervals within a preset distance range;

Alternatively, the distance between the first lens group and the second lens group is controlled to move continuously within a preset distance range.

Further, the step of controlling the distance between the first lens group and the second lens group to move equally or non-equally within a preset distance range specifically includes:

If the position of the first lens group remains unchanged, the second lens group can move closer to or away from the first lens group;

If the position of the second lens group remains unchanged, the first lens group can move closer to or away from the second lens group;

If the positions of the first lens group and the second lens group are both variable, they can move closer to each other or move away from each other.

Further, if the position of the second lens group does not change, control the first driving member to drive the first lens group corresponding to the first driving member to move closer to or away from the second lens group;

If the position of the first lens group does not change, control the second driving member to drive the second lens group corresponding to the second driving member to move closer to or away from the first lens group;

If the positions of the first lens group and the second lens group are both variable, the third driving member and the fourth driving member are controlled to drive the first lens group and the fourth driving member corresponding to the third driving member. The corresponding second lens groups move toward or away from each other synchronously.

Further, the distance adjustment range between the first lens group and the second lens group is 0~300mm;

In the step of controlling the distance between the first lens group and the second lens group to move at equal or non-equal intervals within a preset distance range, the interval range of equal or non-equal intervals is 0 to 300 mm.

Furthermore, the equivalent power calculation formula of the system in front of the user is:

G4＝G3/(1-L2*G3)＝(G1+G2-G1*G2*L1)/(1-L2(G1+G2-G1*G2*L1));

In the formula, G1 is the optical power of the first lens group; G2 is the optical power of the second lens group; G3 is the system optical power after the combination of the first lens group and the second lens group. degree; L1 is the distance between the principal surfaces of the first lens group and the second lens group; L2 is the principal point of the image side of the optical system composed of the first lens group and the second lens group and the user The distance between the vertex of the cornea of the eyeball, or the distance between the principal point of the image side of the optical system composed of the first lens group and the second lens group and the vertex of the cornea of the user's eyeball when the user wears the corrective lens, and the virtual image distance.

In a second aspect, this application provides a control device based on the aforementioned control method, including:

A processing module used to generate optotype images on the display component;

A driving mechanism for transmission connection with at least one of the plurality of lens groups;

A control module for communicating with the processing module and the driving mechanism;

Wherein, the control module controls the processing module to generate an optotype image on the display component, and controls the driving mechanism to drive at least one of the plurality of lens groups to move, so as to change the space between the plurality of lens groups. distance and the distance between the lens assembly and the human eye.

In a third aspect, this application provides a VR device, including: the aforementioned control device.

Further, when the plurality of lens groups includes a first lens group and a second lens group, if the position of the second lens group does not change:

The driving mechanism includes a driving member, a driving gear that is transmission connected to the driving member, a driven gear that is meshed with the driving gear, and a lead screw that is threadedly connected to the driven gear; one end of the lead screw slides Connected to the VR body, the other end is connected to the first lens group;

The driving member rotates to drive the driving gear to rotate, so that the screw drives the first lens group to move relative to the second lens group.

Further, the driving member adopts a stepper motor or an ultrasonic motor;

And/or, the VR body is also provided with a head-mounted connection strap with adjustable length;

And/or, the VR body is also provided with a switch button, and the switch button is communicatively connected with the control module.

Compared with the prior art, the present invention at least has the following beneficial effects:

By adding multiple lens groups to the VR device, and at least one lens group can move relative to the display component, during use, by adjusting the distance between the multiple lens groups, the optotype image on the display component can be The images are imaged in the human eye through multiple lens groups in sequence to form different regulatory stimuli to the human eye. Based on this, the user's visual function examination and visual function training can be achieved at the same time. During the process of visual function examination and training, users do not need to operate VR equipment, and the entire process can be automatically controlled by VR equipment; for users, it is easier and more flexible to use; at the same time, by measuring the distance between multiple lens groups By adjusting the method of active inspection and training, the distance between the user and the visual target image will not change, which can effectively improve the inspection and training effect; in addition, users face smaller visual function diagnosis and treatment VR equipment, and the user experience is better Acceptance is better.

Description of the drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic diagram of wearing the VR device provided by the present invention;

Figure 2 is a partial structural schematic diagram of the VR equipment provided by the present invention;

Figure 3 is a front view of Figure 2;

FIG. 4 is a cross-sectional view along line B-B in FIG. 3 .

icon:

100-VR main body; 200-first lens group; 300-second lens group; 400-driving part; 500-driving gear; 600-driven gear; 700-screw; 800-head-mounted connection belt; 900-switch button.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

It should be noted that when an element is referred to as being "mounted" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it may be directly connected to the other element or there may also be an intervening element present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

This embodiment provides a VR device, which may be electronic devices such as VR glasses and VR helmets. This embodiment does not specifically limit the specific form of the above-mentioned electronic device. For convenience of explanation below, the VR device is VR glasses as an example.

The VR glasses include a VR body 100, a display component for displaying an optotype image, and a plurality of lens groups, all provided on the VR body 100. The lens groups are arranged at intervals in sequence and at least one lens group can move relative to the display component. Optionally, the display component can be a display screen.

In this embodiment, the multiple lens groups include a first lens group 200 and a second lens group 300 . In other embodiments, the lens groups are not limited to two groups, but can also be three groups, four groups, five groups, etc. When the multiple lens groups are three groups, one of the lens groups can move relative to the display screen (for example, the middle lens The group moves and the lens groups on both sides are fixed), or two of the lens groups can move relative to the screen (for example, the middle lens group is fixed and the lens groups on both sides move), or the three lens groups can all move relative to the display screen (for example, the middle lens group is fixed and the lens groups on both sides move). The display moves. In the aforementioned arrangement, when the position of at least one lens group changes, the optical power of the optical system composed of multiple lens groups can be changed, and the optotype image on the display screen can be imaged in the human eye through the multiple lens groups in sequence. To form different regulatory stimulation to the human eye.

In order to facilitate a clear description, the following will describe the lens group in two groups in detail. For other arrangements, please refer to the description of the two groups of lens groups, and the details will not be repeated again.

Specifically, the first lens group 200 and the second lens group 300 both include left and right parts, which correspond to the left and right eyes respectively. Furthermore, each left and right part of the first lens group 200 and the second lens group 300 includes multiple layers of lens sheets, with a gap between two adjacent layers of lens sheets, and the gap between each layer of lens sheets is fixed.

In order to facilitate the fixation of the first lens group 200 or the second lens group 300, it can be fixed through a lens fixing plate. For example, a lens mounting hole is opened at an appropriate position of the lens fixing plate for installing the lens group. By specifying the lens mounting hole, The reasonable setting of the position and the fixed installation of the lens fixing plate can realize the one-to-one arrangement of the lens group and the left and right eyes of the human body.

Furthermore, the VR glasses also include a lens set of its own, which can be integrated with the second lens group 300, or both can be set separately.

In one embodiment, the lens set itself can be a convex lens set. The convex lens set includes two convex lens lenses. The two convex lens lenses are arranged in one-to-one correspondence with the left and right eyes of the human body. The convex lens lens can refract light to separate the display components. The image imaging on the screen is zoomed in to the position of the retina of the human eye, allowing the human eye to easily see clearly the displayed image on the display component that is almost attached to the human eye. For example, the convex lens sheet may be a circular convex lens sheet, or may be set to other shapes as required.

Further, the VR glasses also include a control device, which includes a processing module for generating an optotype image on the display component; a driving mechanism for transmission connection with the first lens group 200 and/or the second lens group 300; control Module for communicating with the processing module and the driving mechanism; wherein, the control module controls the processing module to generate an optotype image on the display component, and controls the driving mechanism to drive the first lens group 200 and/or the second lens group 300 to move to change the The distance between the first lens group 200 and the second lens group 300 and the distance between the two lens groups and the human eye.

Simply put, on the premise that the position of the optotype image generated by the display component remains unchanged, changing the distance between the first lens group 200 and the second lens group 300 can cause the optotype image seen by the human eye to change (such as clearer degree of change), thereby forming different adjustment stimuli for the human eye, and achieving training to improve adjustment flexibility, adjustment amplitude, and positive and negative relative adjustment, so as to achieve the effect of training the eye adjustment function within a certain range.

Specifically, the distance between the first lens group 200 and the second lens group 300 can be adjusted in the following three ways:

(1) The position of the first lens group 200 remains unchanged, and the position of the second lens group 300 changes, that is, it can move closer to or away from the first lens group 200. In this adjustment method, the distance between the second lens group 300 and the human eye The distance also changes simultaneously.

(2) The position of the second lens group 300 remains unchanged, and the position of the first lens group 200 changes, that is, it can move closer to or away from the second lens group 300. In this adjustment method, the distance between the second lens group 300 and the human eye The distance remains unchanged.

(3) The positions of the first lens group 200 and the second lens group 300 are both variable. They can move closer to each other or move away from each other. In this adjustment method, the distance between the second lens group 300 and the human eye also changes synchronously. .

Among the above three adjustment methods, the driving form can be directly driven by the driving source, the driving source is combined with the gear transmission assembly, the driving source is combined with the connecting rod transmission assembly, etc. Of course, as long as the aforementioned driving requirements can be achieved, all forms are included in the present invention. within the scope of protection.

Referring to FIGS. 2 to 4 , this embodiment adopts the form of combining a motor and a gear transmission assembly, and the position of the second lens group 300 remains unchanged, and the first lens group 200 is driven to move closer to or away from the second lens group 300 . Specifically, the driving mechanism includes a driving member 400, a driving gear 500 that is transmission connected to the driving member 400, a driven gear 600 that is meshed with the driving gear 500, and a screw 700 that is threadedly connected to the driven gear 600; one end of the screw 700 It is slidably connected to the VR body 100 and the other end is connected to the first lens group 200; the driving member 400 rotates to drive the driving gear 500 to rotate, so that the screw 700 drives the first lens group 200 to move relative to the second lens group 300.

During operation, the driving part 400 drives the driving gear 500 to rotate, and the driving gear 500 drives the driven gear 600 to rotate. According to the motion principle of the screw nut, on the premise of limiting the rotational freedom of the screw 700, due to the driven gear 600 It is threadedly connected with the lead screw 700. One end of the lead screw 700 is slidingly connected to the VR body 100, and the other end is connected to the first lens group 200. Therefore, the lead screw 700 can drive the first lens group 200 to move forward and backward, thereby realizing the first lens group. Adjustment of the distance between 200 and the second lens group 300.

It should be noted that the “front and back” mentioned above means that the side close to the display screen is the front, and the side far away from the display screen and close to the own lens group is the back. Specifically, the first lens group 200 is disposed on the front side, the second lens group 300 is disposed on the rear side; when the screw 700 drives the first lens group 200 to move forward, the distance between the first lens group 200 and the second lens group 300 increases; when the screw 700 drives the When the first lens group 200 moves backward, the distance between the first lens group 200 and the second lens group 300 decreases.

Optionally, the driving member 400 can be a motor, a rotating cylinder, etc.; the driving gear 500 is a small gear, and the driven gear 600 is a large gear. Through the above settings, the rotation speed of the driving member 400 can be relatively reduced, ensuring that the first lens group 200 rotates slowly It moves quickly and steadily; at the same time, the combination of the driving part 400 and the gear transmission assembly has the characteristics of high transmission accuracy, wide application range, reliable operation, long life, and low noise.

In this embodiment, the motor can be a stepper motor or an ultrasonic motor, which can further improve the transmission accuracy and ensure precise displacement control of the first lens group 200 .

Referring to FIG. 1 , the VR body 100 is also provided with a head-mounted connecting strap 800 with an adjustable length. According to the size of the wearer's head, the length of the head-mounted connecting strap 800 is changed to facilitate use by different wearers.

Optionally, the headband connection strap 800 can be a flexible strap (such as an elastic strap) or a strap with an adjustment buckle.

Please continue to refer to Figure 1. The VR main body 100 is also provided with a switch button 900. The switch button 900 is communicatively connected with the control module; through the switch button 900, the device can be started or shut down.

The control method of the above-mentioned VR glasses includes the following steps: obtaining the optotype image information on the display component; controlling the distance between the first lens group 200 and the second lens group 300 to reciprocally adjust within a preset distance range. During the adjustment process, The optotype image on the display component can be imaged on the human eye through the first lens group 200 and the second lens group 300 in sequence, so as to form different adjustment stimuli for the human eye.

Optionally, the optotype image information may be the "E" optotype, and the specific steps may be to first display the optotype image information, and then control the adjustment of the distance between the first lens group 200 and the second lens group 300; or as described above. Both steps occur simultaneously.

Specifically, it includes the following two implementation methods:

(1) According to a preset time interval, control the distance between the first lens group 200 and the second lens group 300 to move at equal or non-equal intervals within the preset distance range.

When the user uses the VR glasses for training, by adjusting the distance between the first lens group 200 and the second lens group 300, or while adjusting the distance between the first lens group 200 and the second lens group 300, By changing the distance between the second lens group 300 and the human eye, the foregoing adjustment methods can provide different adjustment stimulation to the human eye, so as to realize visual function inspection and visual function training of different functions.

(2) Control the distance between the first lens group 200 and the second lens group 300 to continuously move within a preset distance range. This method can form continuous different adjustment stimuli to the human eye to implement visual function inspection and conduct Training for different functions.

In this embodiment, the distance between the first lens group 200 and the second lens group 300 ranges from 0 to 300 mm.

Specifically, in the (1) implementation, the distance between the first lens group 200 and the second lens group 300 can be increased at equal intervals within the preset distance range and then decreased at equal intervals, wherein the increasing interval range can be It is 0~300mm. Correspondingly, the decreasing interval range can be 300~0mm. At the same time, the preset time interval is set to 1~30s.

For example, the initial distance between the first lens group 200 and the second lens group 300 is set to 5 mm, the preset adjustment range is 5 to 30 mm, the time interval is 5 s, and the incremental spacing is 5 mm. Specifically: first The distance between the lens group 200 and the second lens group 300 changes at equal intervals within a range of 5 to 30 mm. Within a time interval of 5 seconds, the distance between the two can be adjusted to 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, and 25 mm in sequence. , 20mm, 15mm, 10mm, 5mm, the foregoing is a cycle, and a training can be completed by executing several of this cycle.

Alternatively, the distance between the first lens group 200 and the second lens group 300 varies at non-equal intervals within a range of 5 to 30 mm. For example, within a certain time interval, the distance between the two can be adjusted to 5 mm, 10 mm, 13 mm, and 16 mm in turn. , 20mm, 25mm, 30mm, 25mm, 20mm, 16mm, 13mm, 10mm, 5mm. The above is a cycle. Execute several of this cycle to complete a training.

In the (2) implementation manner, if the distance between the first lens group 200 and the second lens group 300 is set to move continuously within 5 to 30 mm, then the distance between the first lens group 200 and the second lens group 300 will be The distance can be continuously changed from 5mm to 30mm, and then from 30mm to 5mm at a certain speed (constant speed or variable speed). The above is a cycle. Execute several of this cycle to complete a training.

On the basis of the above embodiments, it can be concluded that the equivalent optical power calculation formula of the system in front of the user is: G4=G3/(1-L2*G3)=(G1+G2-G1*G2*L1)/(1 -L2(G1+G2-G1*G2*L1));

In the formula, G1 is the optical power of the first lens group 200, which is arranged far away from the human eye; G2 is the optical power of the second lens group 300, which is arranged close to the human eye; G3 is the optical power of the second lens group 300, which is arranged close to the human eye. The optical power of the system after the first lens group 200 and the second lens group 300 are combined; L1 is the distance between the main surfaces of the first lens group 200 and the second lens group 300; L2 is the distance between the first lens group 200 and the second lens group 300. The distance between the principal point of the image side of the optical system formed by the optical system and the vertex of the cornea of the eyeball, or the virtual image after wearing the corrective lens between the principal point of the image side of the optical system formed by the first lens group 200 and the second lens group 300 and the vertex of the cornea of the user's eyeball. The distance is jointly determined by the optical power of the first spherical lens group 200 and the second spherical lens group 300, and the distance from L1 and the second spherical lens group 300 to the vertex of the cornea of the eyeball.

Among them, the calculation formula of G3 is: G3=G1+G2-G1*G2*L1.

According to the lens-eye distance formula: G'=G/(1-dG), in the formula, G' is the equivalent optical power in front of the human eye, G is the optical power of the lens in front of the eye, and d is the rear vertex of the lens to the front of the cornea of the eye. distance, we can derive the equivalent power calculation formula of the system in front of the user's eyes. The equivalent power can indirectly reflect the degree of stimulation to the human eye.

For example, the optical power of the first lens group 200 is -10.00D, and the optical power of the second lens group 300 is +5.00D. When L1 is 10mm and L2 is 32mm, the calculated G4 is -3.93 D; when L1 is 50mm and L2 is 250mm, the calculated G4 is -1.54D. Through the foregoing embodiments, wearing the VR glasses of this embodiment can provide different adjustment stimuli to the human eyes, which not only enables visual function inspection, but also improves the training effect within a certain range.

The technical features of the above embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations should be used. It is considered to be within the scope of this manual.

The above embodiments only express several implementation modes of the present invention. The descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims

A control method for visual function diagnosis and treatment VR equipment, characterized in that the VR equipment includes a VR body, display components for displaying optotype images, and multiple groups of lenses, each of which is provided on the VR body. Group intervals are set and at least one group of the lens groups is movable, wherein the control method includes the following steps: obtaining optotype image information on the display component;

Control at least one of the plurality of lens groups to move within a preset distance range to change the optical power of the optical system composed of the plurality of lens groups. During the movement, the display component The optotype images on the target can be imaged in the human eye through multiple sets of the lens groups in sequence, so as to form different adjustment stimuli to the human eye.
The control method according to claim 1, wherein the plurality of lens groups include a first lens group and a second lens group;

The step of controlling at least one of the plurality of lens groups to move within a preset distance range specifically includes:

According to a preset time interval, control the distance between the first lens group and the second lens group to move at equal or non-equal intervals within a preset distance range;

Alternatively, the distance between the first lens group and the second lens group is controlled to move continuously within a preset distance range.
The control method according to claim 2, characterized in that the step of controlling the distance between the first lens group and the second lens group to move equally or non-equally spaced within a preset distance range specifically includes :

If the position of the first lens group remains unchanged, the second lens group can move closer to or away from the first lens group;

If the position of the second lens group remains unchanged, the first lens group can move closer to or away from the second lens group;

If the positions of the first lens group and the second lens group are both variable, they can move closer to each other or move away from each other.
The control method according to claim 3, characterized in that if the position of the second lens group does not change, the first driving member is controlled to drive the first lens group corresponding to the first driving member closer to or farther away from the first lens group. The second lens group moves;

If the position of the first lens group does not change, control the second driving member to drive the second lens group corresponding to the second driving member to move closer to or away from the first lens group;

If the positions of the first lens group and the second lens group are both variable, the third driving member and the fourth driving member are controlled to drive the first lens group and the fourth driving member corresponding to the third driving member. The corresponding second lens groups move toward or away from each other synchronously.
The control method according to claim 2, characterized in that the distance adjustment range between the first lens group and the second lens group is 0~300mm;

In the step of controlling the distance between the first lens group and the second lens group to move at equal or non-equal intervals within a preset distance range, the interval range of equal or non-equal intervals is 0 to 300 mm.
The control method according to any one of claims 2 to 5, characterized in that the equivalent optical power calculation formula of the system in front of the user is:

G4＝G3/(1-L2*G3)＝(G1+G2-G1*G2*L1)/(1-L2(G1+G2-G1*G2*L1));

In the formula, G1 is the optical power of the first lens group; G2 is the optical power of the second lens group; G3 is the system optical power after the combination of the first lens group and the second lens group. degree; L1 is the distance between the principal surfaces of the first lens group and the second lens group; L2 is the principal point of the image side of the optical system composed of the first lens group and the second lens group and the user The distance between the vertex of the cornea of the eyeball, or the distance between the principal point of the image side of the optical system composed of the first lens group and the second lens group and the vertex of the cornea of the user's eyeball when the user wears the corrective lens, and the virtual image distance.
A control device based on the control method of any one of the preceding claims 1-6, characterized in that it includes:

A processing module for generating an optotype image on the display component;

A driving mechanism for transmission connection with at least one of the plurality of lens groups;

A control module for communicating with the processing module and the driving mechanism;

Wherein, the control module controls the processing module to generate an optotype image on the display component, and controls the driving mechanism to drive at least one of the plurality of lens groups to move to change the multiple groups of lenses. The inter-group distance and the distance between the lens group and the human eye.
A VR equipment, characterized by comprising the control device according to claim 7.
The VR device according to claim 8, wherein when the plurality of lens groups include a first lens group and a second lens group, if the position of the second lens group does not change:

The driving mechanism includes a driving member, a driving gear that is transmission connected to the driving member, a driven gear that is meshed with the driving gear, and a lead screw that is threadedly connected to the driven gear; one end of the lead screw slides Connected to the VR body, the other end is connected to the first lens group;

The driving member rotates to drive the driving gear to rotate, so that the screw drives the first lens group to move relative to the second lens group.
The VR equipment according to claim 9, characterized in that the driving member adopts a stepper motor or an ultrasonic motor;

And/or, the VR body is also provided with a head-mounted connection strap with adjustable length;

And/or, the VR body is also provided with a switch button, and the switch button is communicatively connected with the control module.