WO2016000178A1

WO2016000178A1 - Variable focus lens and mobile terminal

Info

Publication number: WO2016000178A1
Application number: PCT/CN2014/081283
Authority: WO
Inventors: 张斌
Original assignee: 华为技术有限公司
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2016-01-07

Abstract

A variable focus lens and mobile terminal. The variable focus lens include: an elastic lens with a hollow cavity, a bracket covered on the elastic lens for limiting the deformation direction of the elastic lens, the hollow cavity is filled with liquid and the ratio of the refractive index of the liquid to that of the material of the elastic lens is within a preset threshold value range; a liquid filling apparatus, used for filling the hollow cavity with liquid to enable the elastic deformation to happen to the elastic lens. The elastic lens and the liquid filling apparatus are used for achieving fine tuning of the focal length during photographing. With the elastic lens and the liquid filling apparatus filled with liquid, when the focus does not need to be tuned, the elastic lens keep the initial state as a flat mirror and when the focus needs to be tuned, the elastic lens are filled with liquid through the liquid filling apparatus in order that elastic deformation would happen to the two sides in front of the camera of the elastic lens to form a convex lens to achieve the aim of focus tuning and to improve the effect of macro shooting.

Description

Zoom lens and mobile terminal

The present invention relates to the field of camera technology, and in particular, to a zoom lens and a mobile terminal. Background technique

With the development of technology, the camera pixels attached to mobile phones are getting higher and higher, and the functions are getting stronger and stronger. The imaging principle of the mobile phone when shooting can be seen in Figure 9, the imaging principle is: 镜片 lenticular lens + concave lens lens combination to achieve zoom when taking pictures; when shooting macro, increase the distance between the two convex lenses, so that The refraction curvature of the light increases, the focal length decreases, and the magnification increases; wherein the focal length is proportional to the curvature of the light.

It can be seen from the above imaging principle that in macro shooting, it is necessary to increase the distance between two convex lenses; when the required magnification is larger, the increased distance between the two convex lenses is larger. However, due to the limitation of the space structure of the mobile phone, the increased distance between the two convex lenses is limited. This makes the phone less effective when shooting macros. Summary of the invention

The invention provides a zoom lens and a mobile terminal with a camera for improving the effect when the mobile terminal shoots a macro.

In a first aspect, a variable focus lens is provided, the variable focus lens comprising: an elastic lens having a hollow cavity, the elastic lens being provided with a bracket for defining a deformation direction of the elastic lens, wherein the hollow cavity is filled with a liquid And a ratio of a refractive index of the liquid to a refractive index of a material of the elastic lens is within a set threshold;

a liquid filling device for charging the hollow body to elastically deform the elastic lens, and when the liquid charging device returns to an initial state, the liquid charged into the hollow cavity is returned to the liquid In the liquid charging device, the elastic lens returns to an initial state; The elastic lens is a planar lens, and the deformed elastic lens is a convex lens.

In combination with the first aspect, in a first possible implementation, the set threshold is

0.8~1.2.

In conjunction with the first aspect, the first possible implementation of the first aspect, in a second possible implementation, the bracket is a bracket made of a non-elastic material.

In conjunction with the first possible implementation of the first aspect, in a third possible implementation, the bracket is a plastic bracket.

In combination with the foregoing first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, and the third possible implementation manner of the first aspect, in a fourth possible implementation manner The elastic lens and the bracket are integrated, or

The elastic lens, the bracket and the liquid charging device are of a unitary structure.

In combination with the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, and the fourth possible aspect of the first aspect In a fifth possible implementation manner, the elastic lens is an elastic lens made of a tetrafluoroethylene material, and the liquid is glycerin or olive oil.

In combination with the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, and the fourth possible aspect of the first aspect The fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the elastic deformation surface of the elastic lens is rectangular, circular or elliptical.

In combination with the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, and the fourth possible aspect of the first aspect The implementation of the first aspect, the fifth possible implementation of the first aspect, and the sixth possible implementation of the first aspect. In a seventh possible implementation, the liquid charging device includes an elastic pressing portion. The elastic pressing portion has a cavity penetrating the hollow cavity body, and the cavity body is filled with the liquid; when the elastic pressing portion is pressed, the liquid flows into the hollow cavity body .

In combination with the seventh possible implementation of the first aspect above, in an eighth possible implementation The liquid charging device further includes a driving device for pressing the elastic pressing portion to elastically deform.

In conjunction with the eighth possible implementation manner of the foregoing first aspect, in a ninth possible implementation manner, the driving device is a paddle that is rotatably coupled to the mobile terminal housing, and the paddle and the elastic The pressing portion is pressed into contact, and when the paddle rotates, the paddle presses the elastic pressing portion to elastically deform when the wave plate rotates; or

The driving device is a first driving motor, the first driving motor is an angular speed driving motor, and when the angular velocity driving motor rotates, the angular velocity driving motor presses the elastic pressing portion to elastically deform; or

The driving device includes electromagnets respectively disposed on opposite sides of the elastic pressing portion, and when the electromagnet is energized, the two electromagnets attract each other to elastically press the elastic pressing portion to be elastic deformation.

In combination with the foregoing first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, and the fourth aspect of the first aspect A possible implementation, a fifth possible implementation of the first aspect, and a sixth possible implementation of the first aspect. In a tenth possible implementation, the liquid charging device includes a piston a cylinder, a piston is connected to the piston rod, a cavity of the cylinder is filled with liquid, and the inner cavity is in communication with the hollow cavity.

In conjunction with the tenth possible implementation manner of the foregoing first aspect, in the eleventh possible implementation, the piston rod is provided with a rack, and the liquid charging device further includes a second driving motor, A gear that cooperates with the rack is disposed on an output shaft of the second drive motor.

In a second aspect, a mobile terminal is provided, the mobile terminal comprising a camera and a zoom lens disposed in the mobile terminal housing according to any one of the above, and an axis of the elastic lens coincides with an axis of the camera.

In combination with the foregoing second aspect, in a first possible implementation, the mobile terminal further includes: detecting means for detecting a focus of the camera; a control device, wherein the control device is in signal connection with the detecting device, and when the zoom lens has a first driving motor, a second driving motor or an electromagnet, the control device and the first driving motor, The two driving motor or the electromagnet is connected, and when the camera focusing signal detected by the detecting device does not meet the setting requirement, the first driving motor, the second driving motor or the electromagnet is controlled to elastically deform the elastic lens.

According to an embodiment of the invention, the zoom lens has the purpose of fine-tuning the focus during shooting by using an elastic lens and a liquid filling device, and the elastic lens and the liquid filling device are filled with liquid; when the focusing is not required, the elastic lens is located In the initial state, the elastic lens is a flat lens at this time; when focusing is required, the elastic lens is filled with liquid through the liquid filling device, and the elastic lens is elastically deformed by the liquid, and the elasticity is limited by the bracket. The lens is elastically deformed only on the two faces in front of the camera to form a convex lens, which achieves the purpose of focusing and improves the effect of shooting macro. DRAWINGS

1 is a top plan view of a zoom lens according to an embodiment of the present invention;

2 is a reference diagram of a use state of a zoom lens according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a flexible lens of a zoom lens according to an embodiment of the present invention; FIG. 4 is a schematic structural view of a zoom lens according to an embodiment of the present invention; FIG. The provided zoom lens is a structural schematic diagram when the angular speed drive motor is driven;

6 is a schematic structural view of a zoom lens lens driven by an electromagnet according to an embodiment of the present invention; FIG. 7 is a schematic structural view of a zoom lens lens cylinder according to an embodiment of the present invention; The schematic diagram of the provided zoom lens after being driven by the second driving motor;

Figure 9 is a schematic diagram of the ray of the lens when the camera is imaged. detailed description Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1, FIG. 2 and FIG. 3, FIG. 1 is a top view of a zoom lens according to an embodiment of the present invention; FIG. 2 and FIG. 3 are reference diagrams of a use state of a zoom lens according to an embodiment of the present invention.

The embodiment of the invention provides a variable focus lens comprising: an elastic lens 11 having a hollow cavity, a bracket 12 and a liquid filling device 13.

The bracket 12 is disposed outside the elastic lens 11, and the bracket 12 is used to define the deformation direction of the elastic lens 11. The hollow cavity of the elastic lens 11 is filled with liquid, and the ratio of the refractive index of the liquid to the refractive index of the material of the elastic lens 11 is set. Within the threshold;

The liquid charging device 13 is configured to fill the hollow cavity of the elastic lens 11 with liquid to elastically deform the elastic lens 11; when the liquid charging device 13 returns to the initial state, the liquid charged into the hollow cavity is returned to the liquid filling. In the device 13, the elastic lens 11 is restored to the initial state. The elastic lens 11 in the initial state is a planar lens, and the deformed elastic lens 11 is a convex lens.

In the above embodiment, the variable focal length lens 10 is fixed to the casing 20 of the mobile terminal, and the fine focus effect at the time of image pickup is realized by the elastic lens 11 and the liquid filling device 13. Specifically, the elastic lens 11 and the liquid filling device 13 are filled with liquid. When the focusing is not required, the elastic lens 11 is in an initial state. At this time, the elastic lens 11 is a planar lens, and when the focusing is required, the liquid is passed through. The charging device 13 fills the elastic lens 11 with a liquid. Under the action of the liquid, the elastic lens 11 is elastically deformed. At this time, due to the limitation of the bracket 12, the elastic lens 11 is elastically deformed only on the two faces in front of the camera. It can be seen from the performance of the elastic material that the elastic variable located at a position farther from the stent 12 is larger, so that when the liquid is continuously filled into the hollow cavity, the two faces of the elastic lens 11 are convex outward, so that the entire elastic lens 11 is formed. A convex lens structure achieves the purpose of focusing and improves the effect of shooting macro. When it is necessary to return to the initial state, the liquid charging device 13 is returned to the initial state, at which time, the liquid charged into the hollow cavity is returned to the liquid charging device 13, and the elastic lens 11 is restored by its own elastic force. To the initial state.

As can be seen from the above description, the zoom lens 10 provided in this embodiment can pass the control flow. The amount of liquid entering the elastic lens 11 is controlled to control its shape, that is, the focus of the convex lens formed can be controlled to achieve the purpose of focusing. When the light changes, the light passes through in sequence: the film material of the outer layer of the elastic lens 11, the liquid in the hollow cavity, and the film material of the inner layer of the elastic lens 11. In the process of light propagation, in order to avoid the light from passing through different media, the light path changes too much and the focus is uncontrollable. Preferably, the ratio of the refractive index of the liquid to the refractive index of the film material of the elastic lens 11 is between Within the set width; that is, the refractive index of the film material of the elastic lens 11 is as much as the refractive index of the liquid, thereby ensuring that when the focal length is changed, the change of the light can be propagated according to the light propagation path of the convex lens, ensuring that the focus can be located. On the axis of the lens.

The set value may be, for example, 0.8 to 1.2, that is, the ratio of the refractive index of the elastic lens 11 to the refractive index of the liquid may be between 0.8 and 1.2, for example, the ratio of the two may be 0.8, 0.9, 1.0, 1.1, 1.2, etc., any ratio between 0.8 1.2, preferably, the ratio of the refractive indices of the two is 1, or the maximum is close to 1. For example: Elastic lens 11 can be made of PTFE material, and the liquid filled in the hollow cavity can be glycerin or olive oil. The refractive index of polytetrafluoroethylene is about 1.5, the refractive index of glycerol is 1.47, and the refractive index of olive oil is 1.47, thereby ensuring the path of light passing through the elastic lens 11 and the liquid and the path of light passing through the convex lens. The greatest similarity.

The bracket 12 is used to define the deformation direction of the elastic lens 11, and the bracket 12 can be a bracket made of a non-elastic material. Preferably, the bracket 12 can be a plastic bracket having a certain hardness, so as to define the deformation direction of the elastic lens 11, and ensure that the elastic lens 11 can form a convex lens structure when elastic deformation occurs. The surface on which the elastic lens 11 is deformed may have a different shape such as a circular shape, a square shape, or an elliptical shape, or may be a surface of any other shape. In the specific production, the bracket 12, the elastic lens 11, and the liquid filling device 13 can be fabricated by using different combinations. For example, the bracket 12 can be configured as a single body or a separate body with the elastic lens 11, or The bracket 12, the elastic lens 11 and the liquid filling device 13 can be used in one piece or in a separate structure. The bracket 12 and the elastic lens 11 are respectively illustrated by an integral structure and a separate structure. When the integrated structure is used, the side wall of the hollow body is the bracket 12, and the elastic material is wrapped on both sides of the bracket 12 to form a bracket. a structure having a hollow cavity in which the elastic material is deformed when focusing; when a split structure is used, The elastic lens 11 has a hollow cavity, and the bracket 12 is sleeved on the outside of the elastic lens 11, and defines the deformation direction of the elastic lens 11, thereby ensuring the effect of the formed zoom lens 10 when focusing.

In the above embodiment, the elastic lens 11 relies on the liquid in the hollow cavity to elastically deform the elastic lens 11. The liquid filling device 13 only needs to be able to inject liquid into the hollow cavity, and when the elastic lens 11 needs to be recovered, the injected liquid can be sucked back, and a variety of structures can be realized. The specific structure of the liquid charging device 13 will be described in detail below with reference to the drawings.

Example 1

2 and FIG. 3, the liquid filling device 13 may have the following structure. The liquid charging device 13 includes an elastic pressing portion 131 having a cavity penetrating the hollow cavity body, and the cavity is filled with liquid. When the elastic pressing portion 131 is pressed, the liquid flows into the hollow cavity.

Specifically, the elastic pressing portion 131 has a cavity that communicates with the hollow cavity body by the elastic pressing portion 131. When the focus is adjusted, the elastic pressing portion 131 is pressed. The liquid contained in the cavity flows to the hollow cavity in the elastic lens 11 under the action of the pressing force, so that the elastic lens 11 is elastically deformed, thereby achieving the purpose of changing the focal length.

When the elastic pressing portion 131 is driven, either the manual driving or the mechanical structure may be used for driving. Continuing to refer to FIG. 2 and FIG. 3, when the manual is used, the housing 20 of the mobile terminal is provided with a through hole that cooperates with the elastic pressing portion 131. At this time, the elastic pressing portions 131 are respectively disposed in the through holes. The position of the elastic pressing portion 131 is exposed outside the casing 20. When the focus is required, the user can squeeze the elastic pressing portion 131 by hand so that the liquid in the elastic pressing portion 131 flows into the elastic lens. In 11, the purpose of changing the focal length of the elastic lens 11 is achieved.

In addition to the above-described manual focus adjustment, the mechanical structure can be used for focusing, that is, the liquid filling device 13 further includes a driving device for squeezing the elastic pressing portion 131 to be elastically deformed. There may be various types of mechanical structures in which the liquid capable of realizing the extrusion elastic pressing portion 131 flows into the elastic lens 11, and the different structural examples of the driving device will be described in detail below with reference to the drawings.

As shown in FIG. 4, the driving device may be a paddle, that is, the driving device is a paddle 132 rotatably coupled to the mobile terminal housing 20. When the paddle 132 rotates, the paddle 132 presses the elastic pressing portion 131. Elastic deformation occurs. The pressing of the elastic pressing portion 131 is achieved by rotating the paddle 132. During the process of rotating the paddle 132, the contact area between the paddle 132 and the elastic pressing portion 131 is continuously increased, so that the elastic pressing portion 131 is inside. The liquid can continuously flow into the elastic lens 11 to achieve the purpose of focusing.

As shown in Fig. 5, the driving device may be a first driving motor which is an angular speed driving motor 133, and when the angular velocity driving motor 133 is rotated, the angular velocity driving motor 133 is elastically deformed by pressing the elastic pressing portion 131. The elastic pressing portion 131 is pressed by driving the rotor of the motor 133 at an angular velocity, wherein the rotor of the angular velocity motor faces the elastic pressing portion 131 as a helicoid surface, and when the angular velocity motor rotates forward, the rotor and the elastic pressing portion 131 The contact area between the two is gradually increased, so that the liquid in the elastic pressing portion 131 continuously flows into the elastic lens 11 to achieve the purpose of focusing. When the focal length needs to be reduced, the angular velocity motor is reversed, so that the rotor and the elastic extrusion are performed. The contact area of the portion 131 is reduced. At this time, under the elastic restoring force of the elastic lens 11 and the elastic restoring force of the elastic pressing portion 131, the liquid in the elastic lens 11 flows back into the elastic pressing portion 131, and the elastic lens The focal length of 11 is reduced.

As shown in FIG. 6, the driving device may also be two electromagnets 134 disposed on opposite sides of the elastic pressing portion 131. When the electromagnet 134 is energized, the two electromagnets 134 attract each other to press the elastic pressing portion 131. Elastic deformation occurs. The driving device presses the elastic pressing portion 131 by the suction force of two mutually attracting electromagnets 134. Specifically, the battery is powered by the battery of the mobile terminal, and when the focal length needs to be adjusted, the power supply of the electromagnet 134 is improved. The amount of suction between the two electromagnets 134 is increased, so that the electromagnet 134 is pressed against the elastic pressing portion 131, so that the liquid in the elastic pressing portion 131 flows into the elastic lens 11, thereby changing the focal length of the elastic lens 11. . When recovery is required, the amount of power supplied to the two electromagnets 134 is reduced, and the liquid in the elastic lens 11 is returned to the elastic pressing portion 131 by the elastic restoring force of the elastic lens 11 and the elastic pressing portion 131.

Example 2

As shown in Fig. 7, the liquid charging device 13 can also employ the following structure. The liquid charging device 13 includes a cylinder 136 having a piston. The inner cavity of the cylinder 136 is filled with liquid, and the inner cavity communicates with the hollow cavity. Specifically, the liquid charging device 13 is a cylinder 136. The outlet of the cylinder 136 communicates with the hollow cavity of the elastic lens 11. When the focal length of the elastic lens 11 needs to be changed, by moving the position of the piston in the cylinder 136, The liquid in the cylinder 136 is caused to flow into the elastic lens 11 or from the inside of the elastic lens 11 into the cylinder 136, thereby achieving the purpose of changing the focal length of the elastic lens 11. When the structure is used, the cylinder 136 is configured as a flat type cylinder 136, and after being mounted, its wider side is parallel to the housing 20 of the mobile terminal, and the moving direction of the piston is as shown in the figure. When the piston is moved, it is parallel to the housing 20 of the mobile terminal, so that the thickness of the elastic lens 11 provided by the present embodiment can be reduced as much as possible so that the entire elastic lens 11 has a maximum thickness so as to be mounted inside the mobile terminal.

When the liquid charging device 13 of the second embodiment is driven, either the manual method or the mechanical method may be used. When the manual mode is used, the piston is provided with a push rod, and the end of the push rod has a In the bending structure, the housing 20 of the mobile terminal is provided with a sliding groove matched with the bending structure, and in use, the focal length of the elastic lens 11 is changed by pushing the bending structure. Further, when the mechanical mode is employed, referring to Fig. 8, the liquid charging device 13 further includes a second driving motor 135 that drives the piston to move back and forth. Specifically, the push rod of the piston is provided with a rack, and the output shaft of the second drive motor 135 is provided with a gear that cooperates with the rack, so that the forward and reverse of the second drive motor 135 The reciprocating motion of the piston is driven to achieve the purpose of changing the focal length of the elastic lens 11.

It should be understood that the liquid charging device 13 provided by the embodiment of the present invention is not limited to the examples listed in the above specific embodiment 1 and embodiment 2, and may be any other that can achieve liquid filling into the elastic lens 11. The structure is similar to the principle of the above specific embodiment, and will not be further described herein.

According to a second object of the present invention, an embodiment of the present invention provides a mobile terminal including a camera and a zoom lens 10 provided in any one of the above embodiments provided on the mobile terminal housing 20, and an elastic lens The axis of 11 coincides with the axis of the camera.

In the above embodiment, the end of the movement is realized by using the elastic lens 11 capable of adjusting the focal length. The adjustment function of the end micro focus improves the clarity of the mobile terminal during imaging and imaging. The mobile terminal is a common mobile terminal such as a smart phone or a tablet computer.

As a preferred solution, the mobile terminal further includes:

a detecting device for detecting camera focus;

a control device, the control device is in signal connection with the detecting device, and when the zoom lens 10 has a first driving motor, a second driving motor 135 or an electromagnet 134, the control device and the first driving The motor, the second driving motor 135 or the electromagnet 134 are connected, and when the camera focus signal detected by the detecting device does not meet the setting requirement, the first driving motor, the second driving motor 135 or the electromagnet 134 is controlled to drive the elasticity. The lens 11 is elastically deformed.

In a specific use, the focusing effect of the camera is detected by the detecting device. When the focusing does not meet the requirement, the control device controls the first driving motor, the second driving motor 135 or the electromagnet 134 in the variable focal length lens 10 to change the elastic lens 11 The focal length, which allows the camera to focus, improving the effect of the camera.自动 This method is used to achieve autofocus, which is convenient for the user to take pictures. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A variable focus lens, comprising:

An elastic lens having a hollow cavity, the elastic lens being provided with a bracket for defining a deformation direction of the elastic lens, the hollow cavity is filled with a liquid, and a refractive index of the liquid and a refractive index of a material of the elastic lens The ratio is within the set threshold;

a liquid filling device for charging the hollow cavity to elastically deform the elastic lens; and when the liquid charging device returns to an initial state, the liquid charged into the hollow cavity is returned to the liquid In the liquid charging device, the elastic lens returns to an initial state; the elastic lens in an initial state is a planar lens, and the deformed elastic lens is a convex lens.

2. The variable focus lens according to claim 1, wherein the set width is 0.8 to 1.2.

The variable focus lens according to claim 1 or 2, wherein the bracket is a bracket made of a non-elastic material.

The variable focus lens according to claim 3, wherein the bracket is a plastic bracket.

The variable focus lens according to any one of claims 1 to 4, characterized in that:

The elastic lens and the bracket are integrated; or

The variable focus lens according to claim 1, wherein the elastic lens is an elastic lens made of a tetrafluoroethylene material, and the liquid is glycerin or olive oil.

The variable focus lens according to any one of claims 1 to 6, wherein the elastic lens is elastically deformed into a rectangular shape, a circular shape or an elliptical shape.

The variable focus lens according to any one of claims 1 to 7, wherein the liquid charging device comprises an elastic pressing portion, and the elastic pressing portion has a cavity penetrating the hollow body And the cavity is filled with the liquid; when the elastic pressing portion is pressed, the liquid flows into the hollow cavity.

The variable focus lens according to claim 8, wherein the liquid charging device further comprises a driving device for pressing the elastic pressing portion to be elastically deformed.

10. The variable focus lens of claim 9, wherein:

The driving device is a paddle rotatably coupled to the mobile terminal housing, and the paddle presses the elastic pressing portion to elastically deform when the wave plate rotates; or

The driving device includes electromagnets respectively disposed on opposite sides of the elastic pressing portion, and when the electromagnet is energized, the two electromagnets are attracted to each other to elastically deform the elastic pressing portion.

The variable focus lens according to any one of claims 1 to 7, wherein the liquid charging device comprises a cylinder having a piston, the piston is connected with a piston rod, and a cavity of the cylinder is filled a liquid, and the inner cavity is in communication with the hollow cavity.

12. The variable focus lens according to claim 11, wherein the piston rod is provided with a rack, and the liquid charging device further comprises a second driving motor, the output shaft of the second driving motor A gear that cooperates with the rack is provided.

A mobile terminal, comprising: a camera; and the variable focus lens according to any one of claims 1 to 12, which is disposed on a casing of the mobile terminal, and an axis of the elastic lens and the camera The axes coincide.

The mobile terminal of claim 13, further comprising:

a detecting device for detecting camera focus;

a control device, wherein the control device is in signal connection with the detecting device, and when the zoom lens has a first driving motor, a second driving motor or an electromagnet, the control device and the first driving motor, Two driving motor or electromagnet connection, and controlling the first driving motor, the second driving motor or the electromagnet to drive when the camera focusing signal detected by the detecting device does not meet the setting requirement The elastic lens is elastically deformed.