CN111175952A

CN111175952A - Zoom lens, camera module and electronic device

Info

Publication number: CN111175952A
Application number: CN201911417933.XA
Authority: CN
Inventors: 徐青
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-05-19
Also published as: WO2021136280A1

Abstract

The application discloses a zoom lens, a camera module and an electronic device. The zoom lens comprises a shell, a first lens assembly, a second lens assembly, a third lens assembly and a driving chip. The first lens assembly, the second lens assembly, and the third lens assembly are disposed within the housing. The driving chip comprises a first control end and a second control end, and the first control end is connected with the second lens assembly and used for controlling the second lens assembly to move relative to the first lens assembly along the optical axis; the second control end is connected with the third lens component and is used for controlling the third lens component to move along the optical axis relative to the first lens component; the effective control bit of the driving chip is larger than or equal to a preset value, so that the minimum moving unit of the zoom lens accords with preset moving precision. In the zoom lens according to the embodiment of the application, the effective control bit of the driving chip is greater than or equal to the predetermined value, so that the lens assembly of the zoom lens can move with high precision during zooming.

Description

Zoom lens, camera module and electronic device

Technical Field

The present disclosure relates to the field of consumer electronics, and particularly to a zoom lens, a camera module and an electronic device.

Background

In the related art, the zoom lens can change the whole focal length through the movement of the lens group, however, most of the existing driving chips are only suitable for focusing the fixed-focus lens, and the moving stroke range of the lens group is small during focusing, so that the requirement on the output precision of the driving chip is not high. However, in the zoom lens, the moving range of the lens group of the zoom lens is large, and if the driving chip for focusing is continuously used to control the movement of the lens group of the zoom lens, the moving precision of the lens group is reduced.

Disclosure of Invention

Embodiments of the present application provide a zoom lens, a camera module, and an electronic apparatus.

The zoom lens of the embodiment of the application comprises a shell, a first lens assembly, a second lens assembly, a third lens assembly and a driving chip. The first lens assembly, the second lens assembly, and the third lens assembly are disposed within the housing. The second lens assembly and the third lens assembly are both located on an optical axis of the first lens assembly. The driving chip comprises a first control end and a second control end, and the first control end is connected with the second lens assembly and is used for controlling the second lens assembly to move relative to the first lens assembly along the optical axis; the second control end is connected with the third lens component and used for controlling the third lens component to move along the optical axis relative to the first lens component; the effective control bit of the driving chip is larger than or equal to a preset value, so that the minimum moving unit of the zoom lens accords with preset moving precision.

The camera module of the embodiment of the application comprises a photosensitive element and a zoom lens. The photosensitive element is arranged on the image side of the zoom lens. The zoom lens comprises a shell, a first lens assembly, a second lens assembly, a third lens assembly and a driving chip. The first lens assembly, the second lens assembly, and the third lens assembly are disposed within the housing. The second lens assembly and the third lens assembly are both located on an optical axis of the first lens assembly. The driving chip comprises a first control end and a second control end, and the first control end is connected with the second lens assembly and is used for controlling the second lens assembly to move relative to the first lens assembly along the optical axis; the second control end is connected with the third lens component and used for controlling the third lens component to move along the optical axis relative to the first lens component; the effective control bit of the driving chip is larger than or equal to a preset value, so that the minimum moving unit of the zoom lens accords with preset moving precision.

The electronic device of the application comprises the shell and the camera module of the embodiment. The camera module is mounted on the housing. The camera module includes a photosensitive element and a zoom lens. The photosensitive element is arranged on the image side of the zoom lens. The zoom lens comprises a shell, a first lens assembly, a second lens assembly, a third lens assembly and a driving chip. The first lens assembly, the second lens assembly and the third lens assembly are disposed within the housing. The second lens assembly and the third lens assembly are both located on an optical axis of the first lens assembly. The driving chip comprises a first control end and a second control end, and the first control end is connected with the second lens assembly and used for controlling the second lens assembly to move relative to the first lens assembly along the optical axis; the second control end is connected with the third lens component and used for controlling the third lens component to move along the optical axis relative to the first lens component; the effective control bit of the driving chip is greater than or equal to a predetermined number so that the minimum moving unit of the zoom lens conforms to a predetermined moving precision.

In the zoom lens, the camera module and the electronic device according to the embodiment of the application, the driving chip controls the second lens component and the third lens component to move relative to the first lens component through the first control end and the second control end, respectively, so as to change the focal length of the zoom lens, and since the effective control bit of the driving chip is greater than or equal to a predetermined value, so as to make the minimum moving unit of the zoom lens conform to the predetermined moving precision, under the condition that the minimum moving unit corresponding to the minimum unit of the output signal of the driving chip is ensured to be small, for example, the minimum moving unit corresponding to the minimum unit of the output signal of the driving chip is 0.5 micrometer (μm), the driving chip can control the minimum distance of each movement of the second lens component and/or the third lens component to be 0.5 micrometer, the driving chip can control the stroke range of the second lens component and/or the third lens component to move to be large (for example, the effective control bit is 13, the stroke range is 2¹³0.5 ═ 4096 μm), thereby achieving variationThe lens components of the focal lens move with high precision and in a wide range when zooming.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

The above and/or additional aspects and advantages of embodiments of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic plan view of an electronic device according to some embodiments of the present application.

FIG. 2 is a schematic plan view of an electronic device according to some embodiments of the present application from another perspective.

FIG. 3 is a perspective assembled view of a zoom lens according to some embodiments of the present application.

FIG. 4 is a schematic perspective exploded view of a zoom lens according to some embodiments of the present application.

FIG. 5 is a schematic plan view of a driver chip according to some embodiments of the present application.

FIG. 6a and FIG. 6b are schematic cross-sectional views of the zoom lens in FIG. 3 taken along line VI-VI in different focal length states.

FIG. 7 is a schematic plan view of a lens of a zoom lens in some embodiments.

Fig. 8a and 8b are schematic diagrams illustrating positions of the second lens assembly and the third lens assembly in different focal length states in some embodiments.

FIG. 9 is a schematic diagram of the relationship between stroke and current for the second and third lens components of a zoom lens in some embodiments.

Fig. 10 is a schematic cross-sectional view of the zoom lens of some embodiments, taken along a section line corresponding to the VI-VI line of fig. 3.

FIG. 11 is a schematic sectional view of the zoom lens of FIG. 3 taken along line XI-XI.

Detailed Description

Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings indicate the same or similar elements or elements having the same or similar functions throughout the views.

In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only used for explaining the embodiments of the present application, and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, an electronic device 1000 includes a housing 200 and a camera module 100. The camera module 100 is combined with the housing 200. Specifically, the electronic device 1000 may be a mobile phone, a tablet computer, a display, a notebook computer, a teller machine, a gate, a smart watch, a head display device, a game console, and the like. In the embodiment of the present application, the electronic device 1000 is a mobile phone as an example, and it is understood that the specific form of the electronic device 1000 is not limited to the mobile phone.

The chassis 200 may be used to mount the camera module 100, or the chassis 200 may serve as a mounting carrier of the camera module 100. The electronic device 1000 includes a front surface 901 and a back surface 902, the camera module 100 can be disposed on the front surface 901 as a front camera, and the camera module 100 can also be disposed on the back surface 902 as a back camera. The housing 200 may also be used to mount functional modules of the electronic device 1000, such as the camera module 100, a power supply device, and a communication device, so that the housing 200 provides protection for the functional modules, such as dust prevention, falling prevention, and water prevention.

Referring to fig. 3 to 5, the camera module 100 includes a zoom lens 10 and a light sensing element 50, wherein the light sensing element 50 is mounted on an image side of the zoom lens 10. The photosensitive element 50 may be a Complementary Metal Oxide Semiconductor (CMOS) photosensitive element or a Charge-coupled Device (CCD) photosensitive element.

Referring to fig. 3 to 5, a zoom lens 10 according to an embodiment of the present disclosure includes a housing 11, a first lens assembly 12, a second lens assembly 13, a third lens assembly 14, and a driving chip 161. The first lens assembly 12, the second lens assembly 13 and the third lens assembly 14 are arranged in the housing 11, the second lens assembly 13 and the third lens assembly 14 are both located on an optical axis O of the first lens assembly 12, and the optical axis O of the first lens assembly 12, the optical axis of the second lens assembly 13 and the optical axis of the third lens assembly 14 coincide. The driving chip 161 includes a first control end 1611 and a second control end 1612, the first control end 1611 is connected to the second lens assembly 13 for controlling the second lens assembly 13 to move along the optical axis O relative to the first lens assembly 12; the second control end 1612 is connected to the third lens assembly 14 for controlling the movement of the third lens assembly 14 along the optical axis O relative to the first lens assembly 12; the zoom lens 10 can achieve switching between the short focus state and the long focus state by controlling the second lens assembly 13 and the third lens assembly 14 to move along the optical axis O relative to the first lens assembly 12. The effective control bit of the driving chip 161 is greater than or equal to a predetermined value, so that the minimum moving unit of the zoom lens 10 corresponds to a predetermined moving precision, where the minimum moving unit is the minimum distance that the driving chip 161 can control the second lens assembly 13 and/or the third lens assembly 14 to move each time, the minimum moving unit corresponding to the predetermined moving precision may be 0.5 μm, 1 μm, 2 μm, and the like, and in the embodiment of the present application, the minimum moving unit corresponding to the predetermined moving precision is 0.5 μm.

The predetermined value may be a positive integer greater than or equal to 13, for example, the predetermined value is 13, 14, 15, 16, etc., and the valid control bits of the driving chip 161 may be 13, 14, 15, 16, etc. The valid control bit is the number of pins of all the pins of the driving chip 161 that can be used to control the movement of the lens assembly (e.g., the second lens assembly 13 and/or the third lens assembly 14), for example, the number of pins of the driving chip 161 that can be used to control the movement of the lens assembly is 13, and the valid control bit of the driving chip 161 is 13. In the case that the moving stroke ranges of the second lens assembly 13 and the third lens assembly 14 are constant, the predetermined value and the minimum moving unit are inversely related, for example, when the moving stroke range is not changed (e.g. 4096 micrometers (μm)), as the predetermined value increases (i.e. the effective control bit of the driving chip increases), the minimum moving unit corresponding to the minimum signal that can be output is continuously decreased, e.g. when the moving stroke range is increased from 10 bits to 13 bits, the corresponding minimum moving unit is changed from 4 μm to 0.5 μm, and the moving accuracy is significantly increased.

In the zoom lens 10 according to the embodiment of the present application, the driving chip 161 controls the second lens component 13 and the third lens component 14 to move along the optical axis O relative to the first lens component 12 through the first control end 1611 and the second control end 1612, respectively, so as to change the focal length of the zoom lens 10, since the effective control bit of the driving chip 161 is greater than or equal to 13, in the case that the minimum moving unit corresponding to the minimum unit of the output signal of the driving chip 161 is ensured to be small, if the minimum moving unit corresponding to the minimum unit of the output signal of the driving chip 161 is 0.5 micrometers (μm), the minimum distance of each movement of the second lens component 13 and/or the third lens component 14 that can be controlled by the driving chip 161 is 0.5 micrometers, the stroke range of the movement of the second lens component 13 and/or the third lens component 14 that can be controlled by the driving chip 161 is large (if the effective control bit is 13, the stroke range is 2¹³0.5-4096 μm) to achieve high precision and large range of movement of the lens components of the zoom lens 10 (e.g., the second lens component 13 and the third lens component 14) upon zooming.

As shown in fig. 3, for convenience of subsequent description, a direction parallel to the optical axis O is defined as an x direction, and two directions perpendicular to the x direction are defined as a y direction and a z direction, respectively, that is, the x direction, the y direction, and the z direction are perpendicular to each other two by two.

Referring to fig. 3, 4, 6a and 6b, the zoom lens 10 includes a housing 11, a prism assembly 15, a first lens assembly 12, a second lens assembly 13, a third lens assembly 14 and a driving assembly 16. The prism assembly 15, the first lens assembly 12, the second lens assembly 13, and the third lens assembly 14 are sequentially disposed along the optical axis O in the housing 11. Both the second lens assembly 13 and the third lens assembly 14 are movable relative to the first lens assembly 12 along the optical axis O under the control of the drive assembly 16.

The housing 11 includes a base plate 111, side plates 112, and a cover plate 113. The base plate 111, the side plate 112 and the cover plate 113 enclose a receiving space 114, and the prism assembly 15, the first lens assembly 12, the second lens assembly 13 and the third lens assembly 14 are all disposed in the receiving space 114.

The substrate 111 includes a carrying surface 1111. The bearing surface 1111 is parallel to the optical axis O. The carrying surface 1111 is used for carrying the side plate 112, the prism assembly 15, the first lens assembly 12, the second lens assembly 13 and the third lens assembly 14. The substrate 111 may have a rectangular parallelepiped structure, a square structure, a cylindrical structure, or other structures, and is not limited herein. In the present embodiment, the substrate 111 has a rectangular parallelepiped structure.

The carrying surface 1111 is provided with a sliding rail 1112. The sliding rail 1112 extends in a direction parallel to the x-direction. The number of the slide rails 1112 is one or more, for example, the number of the slide rails 1112 is one, two, three, four, or even more. In the present embodiment, the number of the slide rails 1112 is two (the two slide rails 1112 are respectively represented by the first slide rail 1113 and the second slide rail 1114). The extending direction of the first sliding rail 1113 and the second sliding rail 1114 is parallel to the x direction, and the second sliding rail 1114 and the first sliding rail 1113 are sequentially arranged along the y direction. In the x-direction, the first distance between the end of the first slide 1113 close to the prism assembly 15 and the second distance between the end of the second slide 1114 close to the prism assembly 15 and the prism assembly 15 may be the same or different. The third distance between the end of the first slide 1113 remote from the prism assembly 15 and the fourth distance between the end of the second slide 1114 remote from the prism assembly 15 and the prism assembly 15 may or may not be the same. For example, the first distance and the second distance may be different: the first distance is greater than the second distance. Alternatively, the first distance is less than the second distance. The third distance and the fourth distance may be different: the third distance is greater than the fourth distance. Alternatively, the third distance is less than the fourth distance. In this embodiment, the first distance is greater than the second distance, and the third distance is greater than the fourth distance. In this manner, the movement of the second lens assembly 13 and the third lens assembly 14 is restricted by the first slide rail 1113 and the second slide rail 1114.

The side plate 112 is disposed around the edge of the base plate 111. The side plate 112 is perpendicular to the carrying surface 1111 of the substrate 111. The side plate 112 may be provided on the base plate 111 by gluing, screwing, engaging, or the like. The side plate 112 may also be integrally formed with the base plate 111.

The side plates 112 include a first side plate 1121 and a second side plate 1122 that are parallel to the x-direction, and the first side plate 1121 and the second side plate 1122 are opposite.

Referring to fig. 3 and 4, the cover plate 113 is disposed on the side plate 112, and specifically, the cover plate 113 may be mounted on the upper surface 1123 of the side plate 112 by means of fastening, screwing, gluing, or the like.

The surface of the cover plate 113 opposite to the side plate 112 is provided with a light inlet 1131, and the depth direction of the light inlet 1131 can be perpendicular to the x direction, so that the camera module 100 is in a periscopic structure as a whole. In other embodiments, the light inlet 1131 is not a through hole, but a light-transmissive solid structure from which light can enter the accommodating space 114 and enter the prism assembly 15.

Referring to fig. 6a and 6b, the prism assembly 15 is disposed on the supporting surface 1111 of the substrate 111 and located in the accommodating space 114, and the prism assembly 15 includes a mounting platform 151 and a prism 152.

The mounting stage 151 is disposed on the carrying surface 1111 of the substrate 111, and specifically, the mounting stage 151 may be mounted on the carrying surface 1111 by gluing, screwing, engaging, or the like, and the mounting stage 151 may be integrally formed with the substrate 111. The mounting table 151 is provided with a light inlet through hole 153, a light outlet through hole 154 and an accommodating cavity 155. The light inlet through hole 153 and the light outlet through hole 154 communicate the accommodating cavity 155 with the accommodating space 114. Light inlet aperture 153 is opposite to light inlet 1131, and light outlet aperture 154 is opposite to first lens assembly 12.

The prism 152 is disposed in the accommodating cavity 155, and the prism 152 can be mounted on the mounting block 151 by gluing, clamping, or the like. The prism 152 includes an incident surface 156, a reflecting surface 157 and an exit surface 158, the reflecting surface 157 connects the incident surface 156 and the exit surface 158 obliquely, an included angle between the reflecting surface 157 and the supporting surface 1111 may be 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, and the like, in this embodiment, an included angle between the reflecting surface 157 and the supporting surface 1111 is 45 degrees. The incident surface 156 is opposed to the light entrance through hole 153, and the exit surface 158 is opposed to the light exit through hole 154. The reflecting surface 157 serves to reflect the light incident from the incident surface 156 so that the light exits from the exit surface 158. The prism 152 is used to change the outgoing direction of the light entering from the light entering through hole 153. The prism 152 may be a triangular prism 152, and specifically, the cross-section of the prism 152 is a right triangle, two legs of which are formed by the incident surface 156 and the exit surface 158, respectively, and the hypotenuse of which is formed by the reflecting surface 157.

Referring to fig. 4, 6a and 6b, the first lens assembly 12 includes a first housing 121 and a first lens group 122. The first lens group 122 is disposed within the first housing 121.

The first housing 121 is disposed in the receiving space 114, specifically, the first housing 121 can be mounted on the carrying surface 1111 by gluing, screwing, or fastening, and the first housing 121 can be integrally formed with the substrate 111. The first housing 121 includes a light inlet hole 123, a light outlet hole 124, and a receiving cavity 125. The light inlet hole 123 and the light outlet hole 124 communicate the housing cavity 125 with the housing space 114. The light inlet 123 is opposite to the light outlet 154 of the prism assembly 15, and the light outlet 124 is opposite to the second lens assembly 13.

The first lens group 122 is disposed in the accommodating cavity 125, and the first lens group 122 can be mounted in the first housing 121 by gluing, screwing, or engaging. The first lens group 122 opposes an exit face 158 of the prism 152. The first lens group 122 may have positive power or negative power, and in the present embodiment, the first lens group 122 has negative power.

The first lens group 122 includes one or more first lenses 1221. For example, the first lens group 122 may include only one first lens 1221, where the first lens 1221 is a convex lens or a concave lens; or the first lens group 122 includes a plurality of first lenses 1221 (e.g., two or three lenses), and the plurality of first lenses 1221 may be all convex lenses or concave lenses, or part of the plurality of first lenses 1221 is a convex lens and part of the plurality of first lenses is a concave lens. In the present embodiment, the first lens group 122 includes two first lenses 1221. The first lens 1221 may be a glass lens or a plastic lens.

One or more of first lens 1221 may be all part of a solid of revolution, or part of a solid of revolution and part of a solid of revolution. In the present embodiment, each first lens element 1221 is a part of a solid of revolution. For example, as shown in fig. 7, first lens 1221 is first formed by molding revolved lens S1, revolved lens S1 is circular in shape sectioned by a plane perpendicular to optical axis O, the diameter of the circle being R, and then the edge of revolved lens S1 is cut to form first lens 1221. The shape of the first lens 1221 cut by a plane perpendicular to the optical axis O is a rectangle having two side lengths of T1 and T2, T1/R e [0.5, 1 ], and T2/R e [0.5, 1), respectively. For example, T1/R may be 0.5, 0.6, 0.7, 0.75, 0.8, 0.95, etc., and T2/R may be 0.55, 0.65, 0.7, 0.75, 0.85, 0.9, etc. It is understood that the specific ratio of T1/R and T2/R is determined according to the size of the internal space of the electronic device 1000, the optical parameters of the zoom lens 10 (such as the size of the effective optical area of the first lens 1221), and the like. Alternatively, the lenses in the first lens group 122 are directly fabricated using a special mold, the cavity of which is a portion of a solid of revolution for which the specific ratios of T1/R and T2/R have been determined, thereby directly fabricating the first lens 1221. Thus, the first lens 1221 is a part of the revolved body lens S1, and has a smaller volume than the whole revolved body lens S1, so that the overall volume of the zoom lens 10 is reduced, which is advantageous for miniaturization of the electronic device 1000.

Referring to fig. 4, 6a and 6b, the second lens assembly 13 includes a second housing 131, a second lens group 132 and a first ball 133. The second lens group 132 is mounted in the second housing 131. When the second housing 131 slides, the second housing 131 drives the second lens group 132 to slide.

The second housing 131 is formed with a first light inlet 135 and a first light outlet 136 corresponding to the second lens set 132. The second housing 131 is formed with a first accommodating space 137 to accommodate the second lens group 132, and the first accommodating space 137 is communicated with the accommodating space 114 through a first light inlet 135 and a first light outlet 136. The first light inlet 135 is opposite to the light outlet 124 of the first lens assembly 12, and the first light outlet 136 is opposite to the third lens assembly 14.

The second housing 131 also includes opposing first top and bottom surfaces 138, 139 (i.e., the surface of the second housing 131 opposite the bearing surface 1111). The first top surface 138 is opposite to the cover plate 113. The first bottom surface 139 is opposite to the carrying surface 1111 of the substrate 111. The first bottom surface 139 is provided with a first groove 1391, the first ball 133 is disposed in the first groove 1391 and is abutted against the bottom of the sliding rail 1112, and the first ball 133 is slidably connected with the sliding rail 1112.

Specifically, the first groove 1391 matches the shape of the first ball 133, for example, the first ball 133 is spherical and the movement resistance is small, the first groove 1391 is a semicircular groove, and the diameter of the first ball 133 is equal to the diameter of the first groove 1391, that is, half of the first ball 133 is located in the first groove 1391. The first ball 133 and the first groove 1391 are tightly combined, and when the first ball 133 moves, the second ball drives the second housing 131 of the second lens assembly 13 to move. The sliding rail 1112 may be a groove formed on the supporting surface 1111 and extending in a direction parallel to the x-direction, and the sliding rail 1112 may also be a protrusion disposed on the supporting surface 1111 and extending in a direction parallel to the x-direction, and a surface of the protrusion opposite to the bottom surface of the second housing 131 is formed with a groove engaged with the first ball 133. In this embodiment, the sliding rail 1112 is a groove formed on the supporting surface 1111 and having an extending direction parallel to the x direction. After the second lens assembly 13 is installed in the accommodating space 114, a part of the first ball 133 is located in the slide rail 1112 and abuts against the bottom of the slide rail 1112. The inner wall of the slide rail 1112 is shaped into a first arc by a plane perpendicular to the x direction, the outer profile of the first ball 133 is shaped into a second arc by a plane perpendicular to the x direction, and the curvature of the first arc is the same as that of the second arc. Thus, in the y direction, the outer wall of the first ball 133 and the inner wall of the sliding rail 1112 are combined tightly, and the two opposite sides of the outer wall of the first ball 133 are abutted by the two opposite sides of the inner wall of the sliding rail 1112.

The number of the first grooves 1391 is one or more. For example, the number of first grooves 1391 is one, two, three, four, or even more, etc., and in this embodiment, the number of first grooves 1391 is three. The number of the first balls 133 may be one or more. In the present embodiment, the number of the first balls 133 is the same as that of the first grooves 1391, and is also three. Three first grooves 1391 are spaced apart from each other on the first bottom surface 139.

The number of the sliding rails 1112 can be determined according to the positions of the three first grooves 1391, for example, if the connecting line of the three first grooves 1391 is parallel to the optical axis O, only one sliding rail 1112 needs to be arranged; for another example, if the three first grooves 1391 are divided into two groups (hereinafter referred to as a first group and a second group), the first group includes one first groove 1391, the second group includes two first grooves 1391, and the first grooves 1391 of the first group are not located on a line connecting the two first grooves 1391 of the second group (i.e., the three first grooves 1391 may form a triangle), then it is necessary that the two slide rails 1112 correspond to the first group and the second group, respectively. In this embodiment, the three first grooves 1391 are divided into a first group and a second group, the first group includes one first groove 1391, the second group includes two first grooves 1391, the first group corresponds to the first slide rail 1113, and the second group corresponds to the second slide rail 1114. Thus, the first group of corresponding first balls 133 slide in the first slide rail 1113, the second group of corresponding first balls 133 slide in the second slide rail 1113, the first group of corresponding first balls 133 and the second group of corresponding first balls 133 are respectively limited in the first slide rail 1113 and the second slide rail 1114, and the three first balls 133 form a triangle (the center of the first ball 133 in the first slide rail 1113 is the vertex of the triangle), so that the number of the first balls 133 is reduced as much as possible on the premise of ensuring the sliding stability, and the sliding resistance can be reduced. And because in the y direction, the both sides that carry on the back of the body that the outer wall of first ball 133 that correspond of first group is contradicted by the both sides that carry on the back of the body that first slide rail 1113, and the both sides that carry on the back of the body that the outer wall of first ball 133 that correspond of second group is contradicted by the both sides that carry on the back of the body that second slide rail 1114, and three first ball 133 encloses into triangle-shaped, can prevent that second lens subassembly 13 from taking place to rock or slope in the y direction to guarantee that camera module 100's. In addition, since the first distance is greater than the second distance, when the second lens assembly 13 slides along the x direction (i.e. slides towards the first lens assembly 12), the first set of corresponding first balls 133 is abutted by the end of the first sliding rail 1114 close to the prism assembly 15 to limit the second lens assembly 13 from continuing to slide towards the first lens assembly 12, thereby limiting the moving stroke of the second lens assembly 13.

The second lens group 132 is disposed in the first accommodating space 137. Specifically, the second lens group 132 can be mounted in the first accommodating space 137 by gluing, screwing, or clamping. The second lens group 132 may have positive power or negative power, and in the present embodiment, the second lens group 132 has positive power.

The second lens group 132 includes one or more second lenses 1321. The second lens group 132 may only include a second lens 1321, and the second lens 1321 is a convex lens or a concave lens; or the second lens group 132 includes a plurality of second lenses 1321 (e.g., two or three), and the plurality of second lenses 1321 may be all convex lenses or concave lenses, or part of the plurality of second lenses is a convex lens and part of the plurality of second lenses is a concave lens. In this embodiment, the second lens group 132 includes three second lenses 1321. The second lens 1321 may be a glass lens or a plastic lens.

Referring to fig. 7, one or more second lens elements 1321 may be all part of a revolving body, or part of a revolving body and part of a revolving body. In the present embodiment, each second lens element 1321 is a part of a solid of revolution. For example, the second lens 1321 is first formed by molding the revolved lens S1, the revolved lens S1 is circular in shape sectioned by a plane perpendicular to the optical axis O, the diameter of the circle is R, and then the edge of the revolved lens S1 is cut to form the second lens 1321. The second lens 1321 is shaped like a rectangle sectioned by a plane perpendicular to the optical axis O, and two side lengths of the rectangle are T1 and T2, T1/R ∈ [0.5, 1 ], and T2/R ∈ [0.5, 1), respectively. For example, T1/R may be 0.5, 0.6, 0.7, 0.75, 0.8, 0.95, etc., and T2/R may be 0.55, 0.65, 0.7, 0.75, 0.85, 0.9, etc. It is understood that the specific ratio of T1/R and T2/R is determined by the size of the internal space of the electronic device 1000, the optical parameters of the zoom lens 10 (such as the size of the effective optical area of the second lens 1321), and the like; alternatively, the second lens 1321 is directly formed using a special mold, i.e., a mold cavity that is part of a solid of revolution having the specific ratios of T1/R and T2/R determined, to directly form the second lens 1321. In this way, the second lens 1321 is a part of the revolved body lens S1, and has a smaller volume than the whole revolved body lens S1, so that the overall volume of the zoom lens 10 is reduced, which is advantageous for the miniaturization of the electronic device 1000. It should be noted that: fig. 7 is only for illustrating the first lens 1221 and the second lens 1321, and is not for indicating the size of the second lens 1321, and it should be understood that the size of the second lens 1321 is the same as the size of the first lens 1221.

Referring to fig. 4, 6a and 6b, the third lens assembly 14 includes a third housing 141, a third lens group 142 and a third ball 143. The third lens group 142 is mounted in a third housing 141. When the third casing 141 slides, the third casing 141 drives the third lens group 142 to slide.

The third casing 141 is provided with a second light inlet 145 and a second light outlet 146 corresponding to the third lens group 142. The third casing 141 is formed with a second accommodating space 147 to accommodate the third lens group 142, and the second accommodating space 147 is communicated with the accommodating space 114 through the second light inlet 145 and the second light outlet 146. The second light inlet 145 is opposite to the first light outlet 136 of the second lens assembly 13, and the second light outlet 165 is opposite to the photosensitive element 50 (wherein the photosensitive element 50 is disposed on the inner side surface of the side plate 112 opposite to the second light outlet 165).

Third housing 141 also includes opposing second top surface 148 and second bottom surface 149 (i.e., the surface of third housing 141 opposite bearing surface 1111). The second top surface 148 is opposite to the cover plate 113. The second bottom surface 149 is opposite to the carrying surface 1111 of the substrate 111. The second bottom surface 149 is provided with a third groove 1491, the third ball 143 is disposed in the third groove 1491 and is abutted against the bottom of the sliding rail 1112, and the third ball 143 is slidably connected with the sliding rail 1112.

Specifically, the third groove 1491 matches the shape of the third ball 143, for example, the third ball 143 is spherical and has small moving resistance, the third groove 1491 is a semicircular groove, and the diameter of the third ball 143 is equal to the diameter of the third groove 1491, that is, half of the third ball 143 is located in the third groove 1491. The third ball 143 and the third groove 1491 are tightly combined, so that the third ball 143 moves to drive the third casing 141 of the third lens assembly 14 to move. After the third lens assembly 14 is installed in the accommodating space 114, a part of the third ball 143 is located in the sliding rail 1112 and abuts against the bottom of the sliding rail 1112. The inner wall of the slide rail 1112 is shaped into a first arc by a plane perpendicular to the x-direction, the outer profile of the third ball 143 is shaped into a second arc by a plane perpendicular to the x-direction, and the curvature of the first arc is the same as that of the second arc. Thus, in the y direction, the outer wall of the third ball 143 and the inner wall of the sliding rail 1112 are combined tightly, and the two opposite sides of the outer wall of the third ball 143 are abutted by the two opposite sides of the inner wall of the sliding rail 1112.

The number of the third grooves 1491 is one or more. For example, the number of the third grooves 1491 is one, two, three, four, or even more, and in the present embodiment, the number of the third grooves 1491 is three. The number of the third balls 143 may be one or more. In the present embodiment, the number of the third balls 143 is the same as the number of the third grooves 1491, and is also three. Three third grooves 1491 are spaced apart from the second bottom surface 149.

In this embodiment, the three third grooves 1491 are divided into a third group and a fourth group, the third group includes one third groove 1491, the fourth group includes two third grooves 1491, the third group corresponds to the first sliding rail 1113, and the fourth group corresponds to the second sliding rail 1114. Thus, the third balls 143 corresponding to the third grooves 1491 of the third group slide in the first slide rail 1113, the third balls 143 corresponding to the third grooves 1491 of the fourth group slide in the second slide rail 1113, the third balls 143 corresponding to the third group and the third balls 143 corresponding to the fourth group are respectively limited in the first slide rail 1113 and the second slide rail 1114, and the three third balls 143 form a triangle. And because in the y direction, the two opposite sides of the outer wall of the third group of corresponding third balls 143 are abutted by the two opposite sides of the inner wall of the first slide rail 1113, the two opposite sides of the outer wall of the fourth group of corresponding third balls 143 are abutted by the two opposite sides of the inner wall of the second slide rail 1114, and the three third balls 143 enclose a triangle, the third lens assembly 14 can be prevented from shaking or inclining in the y direction, thereby ensuring that the imaging quality of the camera module 100 is not affected. In addition, when the third lens assembly 14 slides in the direction opposite to the x direction (i.e. slides to the photosensitive element 50), the third set of corresponding third balls 143 first contacts one end of the first sliding rail 1113 close to the photosensitive element 50, so as to limit the third lens assembly 14 from continuing to slide in the direction opposite to the x direction, and the first sliding rail 1113 can play a role in limiting the moving stroke of the third lens assembly 14. The third set of corresponding third balls 143 is abutted by an end of the first slide rail 1114 away from the prism assembly 15 to limit the second lens assembly 13 from continuing to slide towards the first lens assembly 12, thereby limiting the moving stroke of the second lens assembly 13. And when the first distance is greater than the second distance and the third distance is greater than the fourth distance, the length of the first sliding rail 1113 is smaller.

The third lens group 142 is disposed in the second accommodating space 147. Specifically, the third lens group 142 can be mounted in the second receiving space 147 by gluing, screwing, or clamping. The third lens group 142 can have positive power or negative power, and in the present embodiment, the third lens group 142 has negative power.

The third lens group 142 includes one or more third lenses 1421. The third lens group 142 includes only one third lens 1421, and the third lens 1421 is a convex lens or a concave lens; or the third lens assembly 142 includes a plurality of third lenses 1421 (e.g., two or three lenses), and the plurality of third lenses 1421 may be all convex lenses or concave lenses, or part of the third lenses is a convex lens and part of the third lenses is a concave lens. In this embodiment, the third lens group 142 includes two third lenses 1421. The third lens 1421 may be a glass lens or a plastic lens.

Referring again to FIG. 7, one or more third lenses 1421 can be all part of a solid of revolution, or part of a solid of revolution and part of a solid of revolution. In the present embodiment, each third lens 1421 is a part of a revolver. For example, the third lens 1421 is first formed into the revolved lens S1 by a mold, the revolved lens S1 is in the shape of a circle with a diameter R, which is cut by a plane perpendicular to the optical axis O, and then the edge of the revolved lens S1 is cut to form the third lens 1421. The shape of the third lens 1421 cut by a plane perpendicular to the optical axis O is a rectangle whose two sides are T1 and T2, T1/R e [0.5, 1 ], and T2/R e [0.5, 1), respectively. For example, T1/R may be 0.5, 0.6, 0.7, 0.75, 0.8, 0.95, etc., and T2/R may be 0.55, 0.65, 0.7, 0.75, 0.85, 0.9, etc. It is understood that the specific ratio of T1/R and T2/R is determined by the size of the internal space of the electronic device 1000, the optical parameters of the zoom lens 10 (such as the size of the effective optical area of the third lens 1421), and the like; alternatively, the third lens 1421 can be directly formed using a special mold, i.e., a mold cavity that is a part of a solid of revolution for which specific ratios of T1/R and T2/R have been determined, thereby directly forming the third lens 1421. In this way, the second lens 1321 is a part of the revolved body lens S1, and has a smaller volume than the whole revolved body lens S1, so that the overall volume of the zoom lens 10 is reduced, which is advantageous for the miniaturization of the electronic device 1000. It should be noted that: fig. 7 is only used for illustrating the first lens 1221, the second lens 1321, and the third lens 1421, and is not used for indicating the size of the third lens 1421, and it should be understood that the size of the third lens 1421, the size of the second lens 1321, and the size of the first lens 1221 are the same.

Referring to fig. 4, fig. 6a and fig. 6b, the driving assembly 16 includes a first driving member 162, a second driving member 163, an anti-shake driving member 164 and a driving chip 161. The driving chip 161 includes a first control terminal 1611, a second control terminal 1612, a first anti-shake control terminal 1613 and a second anti-shake control terminal 1614, the first control terminal 1611 is connected to the second lens assembly 13 via the first driving member 162, the second control terminal 1612 is connected to the third lens assembly 14 via the second driving member 163, the first anti-shake control terminal 1613 and the second anti-shake control terminal 1614 are both connected to the anti-shake driving member 164, and the anti-shake driving member 164 is connected to the prism assembly 15.

The first driver 162 includes a first coil 1621 and a first magnet 1622.

The number of the first coils 1621 is one or more, for example, the number of the first coils 1621 is one, two, three, four, or even more, and in the present embodiment, the number of the first coils 1621 is one. The first coil 1621 is disposed on the first side plate 1121 or the second side plate 1122, but in this embodiment, the first coil 1621 is disposed on an inner side surface of the first side plate 1121, and the first coil 1621 may be attached to the first side plate 1121 by gluing, screwing, engaging, or the like. In other embodiments, there are two first coils 1621, and the two first coils 1621 are disposed on the first side plate 1121 and the second side plate 1122, respectively, in an opposite manner. The first coil 1621 may be disposed at any position of the first side plate 1121, for example, the first coil 1621 may be disposed at an inner side surface (i.e., a surface located in the accommodating space 114) of the first side plate 1121 and located between the second lens group 132 and the third lens group 142; alternatively, the first coil 1621 may be disposed on the inner side surface of the first side plate 1121 and located between the first lens assembly 12 and the second lens assembly 13, and so on, which will not be described herein. In this embodiment, the first coil 1621 may be disposed on the inner side surface of the first side plate 1121 and located between the second lens group 132 and the third lens group 142. In other embodiments, the first coil 1621 may be disposed on the first housing 121 opposite the first magnet 1622.

The first magnet 1622 is connected to the second lens group 132, specifically, the first magnet 1622 is disposed on the second housing 131, and the first magnet 1622 may be disposed on any position of the second housing 131, for example, the first magnet 1622 is disposed on the surface of the second housing 131 opposite to the third housing 141, or the first magnet 1622 is disposed on the surface of the second housing 131 opposite to the first lens assembly 12, and so on. In this embodiment, the first magnet 1622 is provided on a surface of the second housing 131 facing the third housing 141. The first magnet 1622 may be mounted to the second housing 131 by gluing, screwing, or engaging. The first magnet 1622 may be a metal having magnetism, for example, the first magnet 1622 may be any one of iron, cobalt, and nickel, or the first magnet 1622 may be an alloy composed of at least two of iron, cobalt, and nickel.

The second driver 163 includes a second coil 1631 and a second magnet 1632.

The number of the second coils 1631 is one or more, for example, the number of the second coils 1631 is one, two, three, four, or even more, and in this embodiment, the number of the second coils 1631 is one. The second coil 1631 is disposed on the first side plate 1121 or the second side plate 1122, in this embodiment, the second coil 1631 is disposed on the first side plate 1121, and the second coil 1631 may be mounted on the first side plate 1121 by gluing, screwing, engaging, or the like. In other embodiments, there are two second coils 1631, and the two second coils 1631 are disposed on the first side plate 1121 and the second side plate 1122, respectively, in an opposite manner. The second coil 1631 may be disposed at any position of the side plate 112, for example, the second coil 1631 may be disposed on the inner side surface of the first side plate 1121 and between the second lens group 132 and the third lens group 142; alternatively, the second coil 1631 may be disposed on the inner side of the first side plate 1121, and located on the opposite side of the third lens group 142 from the second lens group 132; alternatively, the second coil 1631 may be disposed on the inner side of the side plate 112 opposite to the third lens group 142 (i.e., the second coil 1631 is located on the opposite side of the third lens group 142 from the second lens group 132 and opposite to the second magnet 1632), and so on, which will not be described herein again. In this embodiment, the second coil 1631 is disposed on the inner side of the first side plate 1121, and is located on the opposite side of the third lens group 142 from the second lens group 132.

The second magnet 1632 is connected to the third lens group 142, specifically, the second magnet 1632 is disposed on the third casing, and the second magnet 1632 may be disposed on any position of the third casing 141, for example, the second magnet 1632 is disposed on the surface of the third casing 141 opposite to the second casing 131, or the second magnet 1632 is disposed on the surface of the third casing 141 opposite to the photosensitive element 50, and so on. In the present embodiment, the second magnet 1632 is provided on the surface of the third housing 141 facing the light-sensing element 50, and the second magnet 1632 is attached to the second housing 131 by gluing, screwing, or engaging. The second magnet 1632 may be a metal having magnetism, for example, the second magnet 1632 may be any one of iron, cobalt, and nickel, or the second magnet 1632 may be an alloy composed of at least two of iron, cobalt, and nickel.

In other embodiments, the first coil 1621 is disposed at any position of the second housing 131, for example, the first coil 1621 is disposed on the surface of the second housing 131 opposite to the third housing 141, or the first coil 1621 is disposed on the surface of the second housing 131 opposite to the first lens assembly 12, and so on. The first magnet 1622 is disposed on the first side plate 1121 or the second side plate 1122. For example, the first magnet 1622 is disposed on the first side plate 1121, and specifically, the first magnet 1622 is disposed on the inner side surface of the first side plate 1121 and is located between the second lens group 132 and the third lens group 142.

The second coil 1631 is provided at an arbitrary position of the third casing 141, for example, the second coil 1631 is provided on a surface of the third casing 141 opposite to the second casing 131, or the second coil 1631 is provided on a surface of the third casing 141 opposite to the photosensitive element 50, and so on. The second magnet 1632 is disposed on the first side plate 1121 or the second side plate 1122. For example, the second magnet 1632 is disposed on the first side plate 1121, specifically, the second magnet 1632 is disposed on the inner side surface of the first side plate 1121 and is located on the side of the third lens group 142 opposite to the second lens group 132.

Referring to fig. 3, 4, 6a and 6b, in some embodiments, the first driving element 162 and the second driving element 163 may also be linear motors, a stator of the first linear motor of the first driving element 162 may be fixedly mounted on an inner side surface of the side plate 112, a mover of the first linear motor extends from the stator and is connected to the second housing 131, a stator of the second linear motor of the second driving element 163 is also fixedly mounted on the inner side surface of the side plate 112, and a mover of the second linear motor extends from the stator and is connected to the third housing 141, when the mover of the first linear motor makes a linear telescopic motion, the second housing 131 is driven to move linearly along the optical axis O, and when the mover of the second linear motor makes a linear telescopic motion, the third housing 141 is driven to move linearly along the optical axis O. Of course, the first driving element 162 and the second driving element 163 may have other structures, such as a hydraulic structure, a piezoelectric motor, etc., which are not listed here.

Referring to fig. 3, 4, 6a and 6b, the anti-shake driving member 164 includes a motor 1641 and a connecting frame 1642. One end of the connecting frame 1642 is connected with the motor 1641, the other end is connected with the prism assembly 15, the connecting frame 1642 is fixedly connected with the mounting table 151 of the prism assembly 15, and the mounting table 151 is abutted against the bearing surface 1111.

The motor 1641 may be a stepper motor. The motor 1641 is configured to drive the connecting frame 1642 to move along a first direction (i.e., a direction parallel to the supporting surface 1111 and perpendicular to the optical axis O, or a direction parallel to the y-direction of the zoom lens 10) to drive the prism assembly 15 to move along the first direction, and the motor is further configured to drive the connecting frame 1642 to move along a second direction (i.e., a direction perpendicular to the supporting surface 1111, or a direction parallel to the z-direction of the zoom lens 10) to drive the prism assembly 15 to move along the second direction, that is, the optical axis O, the first direction and the second direction are perpendicular to each other.

The driving chip 161 is connected to the first coil 1621, the second coil 1631 and the motor 1641. Specifically, the first control terminal 1611 is connected to the first coil 1621, the second control terminal 1612 is connected to the second coil 1631, and the first anti-shake control terminal 1613 and the second anti-shake control terminal 1614 are both connected to the motor 1641. The driving chip 161 is disposed on the substrate 111, for example, the substrate 111 itself is a circuit board, and the driving chip 161 is a part of the circuit board. Wiring may be provided within housing 11 to enable connection of driver chip 161 to first coil 1621, second coil 1631 and motor 1641, and driver chip 161 may be connected to second lens assembly 13 and third lens assembly 14 by magnetic connection of first coil 1621 and first magnet 1622, and magnetic connection of second coil 1631 and second magnet 1632.

The driving chip 161 includes a plurality of pins, for example, the number of pins of the driving chip 161 is greater than 13, for example, 20 pins, the number of pins (hereinafter referred to as control pins) in the 20 pins for controlling the output signals of the first control terminal 1611, the second control terminal 1612, the first anti-shake control terminal 1613, and the second anti-shake control terminal 1614 is 13, that is, the effective control bit of the driving chip 161 is 13, and 4 pins in the 20 pins are the first control terminal 1611, the second control terminal 1612, the first anti-shake control terminal 1613, and the second anti-shake control terminal 1614, respectively.

The driving chip 161 controls the signal output of the first control terminal 1611, the second control terminal 1612, the first anti-shake control terminal 1613 and the second anti-shake control terminal 1614 through 13 control pins. For example, the driving chip 161 may output a current signal, a voltage signal, etc. to the first control terminal 1611, the second control terminal 1612, the first anti-shake control terminal 1613, and the second anti-shake control terminal 1614, and in this embodiment, the driving chip 161 may output a current signal to the first control terminal 1611, the second control terminal 1612, the first anti-shake control terminal 1613, and the second anti-shake control terminal 1614.

In the embodiment of the present application, the movement precision of the zoom lens 10 needs to be less than or equal to 0.5 μm to ensure the accuracy of zooming and focusing of the zoom lens 10, for example, the movement precision of the zoom lens 10 is equal to 0.5 μm, which means that the zoom lens 10 needs to move by 0.5 μm at least when the driving chip 161 outputs different current signals each time, and the driving chip 161 can output 2 signals through 13 control pins¹³The maximum travel range of the second lens assembly 13 and the third lens assembly 14 is 2 when different current signals are applied¹³0.5 ═ 4096 μm, that is, the distance between the start and end points of the movement strokes of the second lens assembly 13 and the third lens assembly 14 may be 4096 μm at the maximum.

Referring to fig. 5, fig. 6a and fig. 6b, when a user uses the electronic device 1000 (for example, a mobile phone, fig. 1) to take a picture, the user can manually select a telephoto mode or a short-focus mode, the telephoto mode is generally used for taking a picture of a distant object, the viewing range is smaller, the short-focus mode (commonly referred to as a wide-angle mode) is generally used for taking a picture of a close object, and the viewing range is larger. When the user selects the desired shooting mode, the processor of the mobile phone will send a control instruction, and the driving chip 161 starts to control the second lens assembly 13 and the third lens assembly 14 to move along the optical axis O relative to the first lens assembly 12 after receiving the control instruction, so as to switch the zoom lens 10 between the telephoto state (corresponding to the telephoto mode) and the short focus state (corresponding to the short focus mode).

Specifically, the first control end 1611 outputs a current signal to control the current input into the first coil 1621, when the first coil 1621 is energized, a lorentz force is generated between the first coil 1621 and the first magnet 1622, when the lorentz force is greater than a static friction force between the second lens assembly 13 and the sled, the first magnet 1622 is pushed by the lorentz force to drive the second lens assembly 13 to move along the first sled 1113 and the second sled 1114, the first control end 1611 can control the direction of the lorentz force by controlling the direction of the current input into the first coil 1621, so that the second lens assembly 13 moves along the x direction or the direction opposite to the x direction, the current input into the first coil 1621 is changed simultaneously with the change of the current signal output by the driving chip 161, the second lens assembly 13 can move within a fixed stroke range (hereinafter referred to as a first stroke range, if the first stroke range is the section AB of the slide rail in fig. 8a and 8B, which is [0 μm, 4096 μm ]) and moves, the stroke of the second lens assembly 13 changes as the current input into the first coil 1621 changes, wherein the corresponding relationship between the stroke S (in μm) and the current I (in milliamp (ma)) is as shown in fig. 9, the stroke corresponding to the a position is 0um, and the stroke corresponding to the B position is 4096 um. It can be understood that when the mobile phone is in different use states, the lorentz force required for moving the second lens assembly 13 is different, and the corresponding required current is different, for example, when the mobile phone is in an upright state (i.e. perpendicular to the ground), when the second lens assembly 13 moves towards the direction close to the ground (i.e. the direction opposite to the x direction), the lorentz force F1 plus the gravity of the second lens assembly 13 is greater than the static friction force between the second lens assembly 13 and the slide rail, so as to drive the second lens assembly 13 to move, and at this time, the required lorentz force F1 is smaller, as shown in a curve S1 in fig. 9, and the corresponding current I1 is smaller when the stroke of the second lens assembly 13 starts to change. When the second lens element 13 moves away from the ground (i.e., in the x direction), the lorentz force F2 is larger than the gravity of the second lens element 13 plus the static friction between the second lens element 13 and the slide rail, so as to drive the second lens element 13 to move, and at this time, the required lorentz force F2 is larger, as shown in the curve S3 in fig. 9, and the corresponding current I2 is larger when the stroke of the second lens element 13 starts to change. When the mobile phone is in a horizontal state (i.e. parallel to the ground), and at this time, when the second lens assembly 13 moves in the x direction or the opposite direction of the x direction, it is only required that the lorentz force F3 is greater than the static friction force between the second lens assembly 13 and the slide rail, at this time, the required lorentz force F3 is located between the lorentz force F1 and the lorentz force F2, as shown by a curve S2 in fig. 9, and the corresponding current I3 when the stroke of the second lens assembly 13 starts to change is located between the current I1 and the current I2. In this way, the current input into the first coil 1621 is controlled by the first control terminal 1611, so as to control the stroke of the second lens assembly 13.

The second control end 1612 outputs a current signal to control the current input into the second coil 1631, when the second coil 1631 is energized, a lorentz force is generated between the second coil 1631 and the second magnet, when the lorentz force is larger than a static friction force between the third lens assembly 14 and the slide rail, the second magnet is pushed by the lorentz force to drive the third lens assembly 14 to move along the first slide rail and the second slide rail, when the lorentz force is larger than the static friction force between the third lens assembly 14 and the slide rail, the second control end 1612 can control the direction of the lorentz force by controlling the direction of the current input into the second coil 1631, so that the second lens assembly 13 moves along the x direction or the direction opposite to the x direction, the current input into the second coil 1631 changes simultaneously with the change of the current signal output by the driving chip 161, and the third lens assembly 14 can move within a fixed stroke range (hereinafter referred to as a second stroke range, for example, the second stroke range is the CD segment, is [0 μm, 4096 μm ]), the stroke of the third lens component 14 is also changed along with the change of the current input into the second coil 1631, wherein the corresponding relationship between the stroke and the current is as shown in fig. 9, the stroke of the C position is 0 μm, and the stroke of the D position is 4096 μm. It can be understood that when the usage status of the mobile phone is different, the lorentz force required for moving the third lens assembly 13 is also different, and the corresponding required current is also different, and since the change of the lorentz force required for moving the third lens assembly 13 and the corresponding current is substantially the same as the change of the lorentz force required for moving the third lens assembly 13 and the corresponding current, the detailed explanation please refer to the foregoing description, and details are not repeated herein. Thus, the current input into the second coil 1631 is controlled by the second control terminal 1612, so as to control the stroke of the third lens element 14.

In the long focus state and the short focus state, the second lens element 13 and the third lens element 14 have different strokes, respectively. For example, in the telephoto state, the strokes of the second lens assembly 13 and the third lens assembly 14 are p0 and m0, respectively; in the short focus state, the strokes of the second lens assembly 13 and the third lens assembly 14 are p1 and m1, respectively, wherein p0 and p1 are located in the first stroke range, and m0 and m1 are located in the second stroke range. According to the current state (such as the vertical state or the horizontal state) of the mobile phone and the moving direction of the lens assemblies (such as the second lens assembly 13 and the third lens assembly 14), a mapping curve of the stroke S and the current I can be determined, for example, the mobile phone is in the horizontal state, and according to the mapping curve S2, the currents I4 and I5 corresponding to p0 and p1, respectively, and the currents I6 and I7 corresponding to m0 and m1, respectively, are determined, for example, the second lens assembly 13 is initially located at the a position, the third lens assembly 14 is initially located at the C position, the first control end 1611 controls the current input to the first coil 1621 to be I4, the second control end 1612 controls the current input to the second coil 1631 to be I6, so that the second lens assembly 13 can be moved to the p0 position, and the third lens assembly 14 is moved to the m0 position, thereby switching the mobile phone 10 to the telephoto state. Similarly, the second lens element 13 is initially located at the a position, the third lens element 14 is initially located at the C position, the first control terminal 1611 controls the current input to the first coil 1621 to be I5, and the second control terminal 1612 controls the current input to the second coil 1631 to be I7, so that the second lens element 13 can be moved to the p1 position, and the third lens element 14 can be moved to the m1 position, so that the zoom lens 10 is switched to the short focus state.

In the present embodiment, when the zoom lens 10 is in a short focus state (as shown in fig. 6 a), the first on-axis distance z11 between the first lens group 122 and the second lens group 132 is greater than the first on-axis distance z12 between the first lens group 122 and the second lens group 132 when the zoom lens 10 is in a long focus state (as shown in fig. 6 b), and the second on-axis distance z21 between the second lens group 132 and the third lens group 142 when the zoom lens 10 is in the short focus state is greater than the second on-axis distance z21 between the second lens group 132 and the third lens group 142 when the zoom lens 10 is in the long focus state. That is, when the zoom lens 10 changes from the short focus state to the long focus state, the second lens group 132 moves close to the first lens group 122 (the first on-axis pitch decreases), the third lens group 142 moves close to the second lens group 132, and the second on-axis pitch decreases. In other embodiments, the first on-axis distance z11 when the zoom lens 10 is in the short focus state is smaller than the first on-axis distance z12 when the zoom lens 10 is in the long focus state, and the second on-axis distance z21 when the zoom lens 10 is in the short focus state is smaller than the second on-axis distance z22 when the zoom lens 10 is in the long focus state; alternatively, the first on-axis distance z11 when the zoom lens 10 is in the short focus state is smaller than the first on-axis distance z12 when the zoom lens 10 is in the long focus state, the second on-axis distance z21 when the zoom lens 10 is in the short focus state is larger than the second on-axis distance z22 when the zoom lens 10 is in the long focus state, and so on, and the trend of the change of the first on-axis distance z1 and the second on-axis distance z2 when the zoom lens 10 is switched from the short focus state to the long focus state can be determined according to the parameters (such as the surface type parameters, the aspherical surface coefficient parameters, and so on) of the first lens group 122 to the third lens group 142, which are not listed.

It will be appreciated that the zoom lens 10 varies in the focal length according to the magnitude of the decrease in the first on-axis distance and the second on-axis distance, e.g., the focal length of the zoom lens 10 gradually increases as the first on-axis distance and the second on-axis distance both gradually decrease. For another example, as the first on-axis pitch and the second on-axis pitch gradually decrease, the focal length of the zoom lens 10 gradually increases, and so on. In the present embodiment, the focal length of the zoom lens 10 gradually increases as the first on-axis distance and the second on-axis distance gradually decrease. In this way, the zoom lens 10 can control the focal length multiple to gradually change, for example, as the first on-axis distance and the second on-axis distance gradually decrease, the focal length gradually changes from 1 time of the initial focal length to 10 times of the initial focal length (the initial focal length is the focal length when the zoom lens 10 is in the short focal state), so that the zoom lens 10 realizes 10 times optical zooming.

After the zoom lens 10 finishes zooming, the mobile phone can obtain an image of a shot object through the camera module 100, and simultaneously judge whether the definition of the image reaches a preset definition in real time, wherein the definition of the image can be obtained by calculating the contrast ratio of the image. During imaging, light rays sequentially pass through the light inlet 1131 of the cover plate 113 and the light inlet hole 153 of the prism assembly 15, are reflected by the reflection surface 157 of the prism 152, and then exit from the light outlet hole 154, and then sequentially pass through the light inlet hole 123 of the first lens assembly 12, the first lens group 122, the light outlet hole 124, the first light inlet 135, the second lens group 132, and the first light outlet 136 of the second lens assembly 13, and the second light inlet 145, the third lens group 142, and the second light outlet 146 of the third lens assembly 14, and finally reach the photosensitive element 50 for imaging.

When the image definition does not reach the preset definition, it indicates that the focal length cannot enable the object to be imaged clearly, and focusing is required at this time, and the focusing process is to slightly adjust the focal length, and compared with the focal length adjustment with a large zooming range, the current state (such as a short-focus state or a long-focus state) of the zoom lens 10 is not changed in the focusing process.

In the process of focusing, for example, the zoom lens 10 is in a short focus state (i.e. as shown in fig. 8a, the second lens assembly 13 is located at P0, the third lens assembly 14 is located at m 0), the second control end 1612 controls the current input to the second coil 1631, so that the third lens assembly starts to move with P0 as a starting position, each time with a minimum moving precision (e.g. 0.5 μm), for example, the focusing stroke range is [0 μm, 512 μm ] (e.g. the E position and the F position in fig. 8a correspond to 0 μm and 512 μm respectively, the P0 position corresponds to 256 μm in the stroke range), the second control end 1612 can control the third lens assembly 14 to move along the x direction, each time with one movement (i.e. 0.5 μm), that is, the definition of the image of the object to be shot is obtained and whether the definition reaches the preset definition or not is determined, if the resolution does not reach the preset resolution until the resolution reaches the E position, the third lens assembly 14 is controlled to move to the P0 position quickly (for example, the current input to the second coil 1631 is controlled to just make the third lens assembly 14 move 256 μm in the direction opposite to the x direction), and then the third lens assembly 14 is controlled to move continuously in the direction opposite to the x direction to the F position, until the resolution of the image of the object reaches the preset resolution, it is determined that the focusing is completed, and at this time, the second control end 1612 controls the third lens assembly 14 to stop moving.

In the process of focusing, for example, the zoom lens 10 is in a long focus state (i.e. as shown in fig. 8b, the second lens assembly 13 is located at P1, the third lens assembly 14 is located at m 1), the second control end 1612 controls the current input to the second coil 1631, so that the third lens assembly starts to move with P1 as a starting position, each time with a minimum moving precision (e.g. 0.5 μm), for example, the focusing stroke range is [0 μm, 512 μm ] (e.g. the G position and the H position in fig. 8b correspond to 0 μm and 512 μm respectively, the m1 position corresponds to 256 μm in the stroke range), the second control end 1612 can control the third lens assembly 14 to move along the x direction, each time with one movement (i.e. 0.5 μm), that is, the definition of the image of the object to be shot is obtained and whether the definition reaches the preset definition or not is judged, if the sharpness does not reach the preset sharpness until the third lens assembly 14 moves to the G position, the third lens assembly 14 is controlled to move to the m1 position quickly (for example, the current input to the second coil 1631 is controlled to just make the third lens assembly 14 move 256 μm in the direction opposite to the x direction), and then the third lens assembly 14 is controlled to continue moving to the H position in the direction opposite to the x direction until the sharpness of the image of the object reaches the preset sharpness, which is determined to be the completion of focusing, and at this time, the second control end 1612 controls the third lens assembly 14 to stop moving. Thus, the focusing of the zoom lens 10 can be accurately completed, and the focusing accuracy is good because the moving precision is high (only 0.5 μm can be moved in each movement).

In other embodiments, the zoom lens 10 can further control the current input to the first coil 1621 through the first control terminal 1611 to control the second lens assembly 13 to move along the optical axis O relative to the first lens assembly 12, so as to achieve focusing of the zoom lens 10.

In the process of shooting by using the mobile phone, because the user generally does not use a stabilizer (such as a handheld pan/tilt head or the like) to shoot, because the user shakes his hand, which may cause the zoom lens 10 to be affected by shaking, the shot picture becomes blurred, the mobile phone generally is equipped with a gyroscope for detecting the shaking of the user, after the shaking data of the user is obtained, the processor may generate a corresponding movement control instruction and send the movement control instruction to the driving chip 161, the driving chip 161 controls the motor 1641 to drive the connecting frame 1642 to move along a first direction through the first anti-shake control terminal 1613 and the second anti-shake control terminal 1614, respectively, so as to drive the prism assembly 15 to move along the first direction, the motor 1641 is further configured to drive the connecting frame 1642 to move along a second direction so as to drive the prism assembly 15 to move along the second direction, the first direction is perpendicular to the second direction, the first direction is parallel to the bearing surface 1111 and perpendicular to the optical axis O, the first direction is a direction parallel to the y-direction of the zoom lens 10), and the second direction is perpendicular to the mount surface 1111 (i.e., the second direction is a direction parallel to the Z-direction of the zoom lens 10). In this way, the zoom lens 10 can change the deviation of the optical path caused by the shake of the user by controlling the prism assembly 15 to move along the first direction and the second direction perpendicular to the optical path O, so as to counteract the effect of the shake of the user on the shooting, and achieve optical anti-shake.

Referring to fig. 4 and 5, in some embodiments, the driving chip 161 further includes a third control terminal 1615, and the third control terminal 1615 is used for controlling the focusing of the third lens assembly 14 in the short-focus state and the long-focus state.

Specifically, the zoom lens 10 needs to focus when zooming is completed to switch between the short focus state and the long focus state, and in order to make the focusing precision higher, the zoom lens 10 separately sets the third control terminal 1615 to control the movement of the third lens component 14, and since the stroke range of focusing is smaller, only 500 μm, the movement precision is 500um/2¹³Approximately equal to 0.061 μm, the third lens element 14 can be moved with a movement accuracy of 0.5 μm to achieve a higher focusing accuracy than the travel range of 4000 μm required by the second control terminal 1612 to achieve both zooming and focusing.

Referring to fig. 5 and 10, in some embodiments, the zoom lens 10 further includes a fourth lens assembly 17 disposed in the housing 10, and the driving chip 161 further includes a third control terminal 1615, where the third control terminal 1615 is used for controlling the fourth lens assembly 17 to move along the optical axis O relative to the first lens assembly 12.

Specifically, in order to realize a wider range of focal length changes, for example, 50 times optical zoom, the zoom lens 10 may be provided with a movable fourth lens assembly 17, wherein the first lens assembly 12, the second lens assembly 13, the third lens assembly 14 and the fourth lens assembly 17 are sequentially arranged along the optical axis O, and the fourth lens assembly 17 is controlled by the third control end 1615 to move in the x direction or the direction opposite to the x direction, so as to realize a wider range of focal length changes.

Referring to fig. 11, in some embodiments, the cover plate 113 may further include a cover plate body 1132 and a boss 1133, the boss 1133 is connected to the cover plate body 1132, the first lens assembly 12 is disposed in the boss 1133, and the first lens group 122 of the first lens assembly 12 is opposite to the incident surface 156 of the prism 152.

Specifically, the boss 1133 defines a mounting space 1135, the mounting space 1135 is communicated with the accommodating space 114, the first lens assembly 12 is disposed in the mounting space 1135, and the first lens assembly 12 is formed with an optical axis O ', and the optical axis O' is perpendicular to the optical axis O. The first lens assembly 12 can be mounted in the mounting space 1135 by gluing, screwing, clipping, etc., and the first lens assembly 12 can be integrally formed with the boss 1133. The end surface of the boss 1133 opposite to the prism assembly 15 is provided with a light inlet 1131, and the depth direction of the light inlet 1131 can be parallel to the optical axis O', so that the whole camera module 100 is in a periscopic structure. The light inlet 1131 is opposite to the light inlet 123 and the light outlet 124 of the first housing 121 and the light inlet hole 153 of the prism assembly 15. In this way, the length of the zoom lens 10 in a certain direction (e.g., x direction) can be reduced.

Referring to fig. 4, fig. 6a and fig. 6b, in some embodiments, the first top surface 138 defines a second groove 1381, and the second lens assembly 13 further includes a second ball 134, wherein the second ball 134 is disposed in the second groove 1381 and abuts against the cover plate 113.

Specifically, the second grooves 1381 match the shape of the second balls 134, for example, the second balls 134 are spherical and have a small moving resistance, the second grooves 1381 are semicircular grooves, and the diameters of the second balls 134 and the second grooves 1381 are equal, that is, half of the second balls 134 are located in the second grooves 1381. The combination of the second ball 134 and the second groove 1381 is relatively tight, and when the second ball 134 moves, the second ball drives the second housing 131 of the second lens assembly 13 to move. The number of the second recesses 1381 is one or more. For example, the number of the second grooves 1381 is one, two, three, four, or even more, and in the present embodiment, the number of the second grooves 1381 is three. The number of the second balls 134 may be one or more. In the present embodiment, the number of the second balls 134 is the same as that of the second recesses 1381, and is three. Three second recesses 1381 are provided at intervals on the first top surface 138 of the second housing 131. The second ball 134 is disposed in the second recess 1381 and abuts against the cover plate 113, so that the second lens assembly 13 is confined between the cover plate 113 and the base plate 111, and the second lens assembly 13 is prevented from shaking or tilting in the z direction, thereby ensuring that the imaging quality is not affected.

Referring to fig. 4, 6a and 6b, in some embodiments, the surface of the cover plate 113 opposite to the first top surface 138 is formed with a slide channel 1134, and the second ball 134 is disposed in the second groove 1381 and abuts against the bottom of the slide channel 1134.

Specifically, the slide channel 1134 may be a groove formed on a surface of the cover plate 113 opposite to the first top surface 138 and having an extending direction parallel to the x direction, and the slide channel 1134 may also be a protrusion provided on a surface of the cover plate 113 opposite to the first top surface 138 and having an extending direction parallel to the x direction, and a surface of the protrusion opposite to the first top surface 138 of the second housing 131 is formed with a groove for matching with the second ball 134. In the present embodiment, the slide channel 1134 is a groove formed on a surface of the cover plate 113 opposite to the first top surface 138, and the extending direction of the groove is parallel to the x direction. After the second lens assembly 13 is mounted in the receiving space 114, a portion of the second ball 134 is located in the slide channel 1134 and abuts against the bottom of the slide channel 1134. The inner wall of the slide channel 1134 is shaped like a third arc by a plane perpendicular to the x-direction, and the outer contour of the second ball 134 is shaped like a fourth arc by a plane perpendicular to the x-direction, and the curvature of the third arc is the same as that of the fourth arc. Thus, in the y direction, the outer wall of the second ball 134 and the inner wall of the slide channel 1134 are tightly combined, and the two opposite sides of the outer wall of the second ball 134 are contacted by the two opposite sides of the inner wall of the slide channel 1134.

The number of the slide rails 1134 can be determined according to the positions of the three second grooves 1381, for example, if the connecting line of the three second grooves 1381 is parallel to the optical axis O, only one slide rail 1134 needs to be arranged; for another example, the three second grooves 1381 are divided into two groups (hereinafter referred to as a fifth group and a sixth group), the fifth group includes one second groove 1381, the sixth group includes two second grooves 1381, and the second grooves 1381 of the fifth group are not on a connection line of the two second grooves 1381 of the sixth group (i.e., the three second grooves 1381 may enclose a triangle), two slide ways 1134 are required to correspond to the fifth group and the sixth group, respectively. In this embodiment, the three second grooves 1381 are divided into a fifth group and a sixth group, the fifth group includes one second groove 1381, the sixth group includes two second grooves 1381, the number of the slide rails 1134 is two (hereinafter, referred to as a first slide rail 1157 and a second slide rail 1158), the fifth group corresponds to the first slide rail 1157, and the sixth group corresponds to the second slide rail 1158. Thus, the second balls 134 corresponding to the fifth group slide in the first slide way 1157, the second balls 134 corresponding to the sixth group slide in the second slide way 1113, the second balls 134 corresponding to the fifth group and the second balls 134 corresponding to the sixth group are limited in the first slide way 1157 and the second slide way 1158, respectively, and the three second balls 134 form a triangle, so that the number of the second balls 134 is reduced as much as possible on the premise of ensuring the sliding stability, and the sliding resistance can be reduced. And because in the y direction, the two sides of the back of the body of the outer wall of the second ball 134 corresponding to the fifth group are abutted by the two sides of the back of the body of the inner wall of the first slide 1157, the two sides of the back of the body of the outer wall of the second ball 134 corresponding to the sixth group are abutted by the two sides of the back of the body of the inner wall of the second slide 1158, and the three second balls 134 enclose into a triangular shape, the second lens assembly 13 can be prevented from shaking or inclining in the y direction, thereby ensuring that the imaging quality of the camera module 100 is not affected.

Referring to fig. 4, 6a and 6b, in some embodiments, the second top surface 148 defines a fourth groove 1481, and the third lens assembly 14 further includes a fourth ball 144, wherein the fourth ball 144 is disposed in the fourth groove 1481 and abuts against the cover plate 113.

Specifically, the fourth groove 1481 matches the shape of the fourth ball 144, for example, the fourth ball 144 is spherical and has less resistance to movement, the fourth groove 1481 is a semicircular groove, and the diameter of the fourth ball 144 is the same as the diameter of the fourth groove 1481, that is, half of the fourth ball 144 is located within the fourth groove 1481. The fourth ball 144 and the fourth groove 1481 are tightly coupled to each other, so that the fourth ball 144 moves to move the third housing 141 of the third lens assembly 14. The number of the fourth grooves 1481 is one or more. For example, the number of the fourth grooves 1481 is one, two, three, four, or even more, and in the present embodiment, the number of the fourth grooves 1481 is three. The number of the fourth balls 144 may be one or more. In the present embodiment, the number of the fourth balls 144 is the same as that of the fourth grooves 1481, and is three. Three fourth grooves 1481 are provided at intervals on the second top surface 148 of the third housing 141. The fourth ball 144 is disposed in the fourth groove 1481 and abuts against the cover plate 113, so that the third lens assembly 14 is confined between the cover plate 113 and the base plate 111, and the third lens assembly 14 is prevented from shaking or tilting in the z direction, thereby ensuring that the imaging quality is not affected.

Referring to fig. 4, 6a and 6b, in some embodiments, the surface of the cover plate 113 opposite to the second top surface 148 is formed with a slide channel 1134, and the fourth ball 144 is disposed in the fourth groove 1481 and abuts against the bottom of the slide channel 1134.

After the third lens assembly 14 is mounted in the receiving space 114, a portion of the fourth ball 144 is located in the slide channel 1134 and abuts against the bottom of the slide channel 1134. The inner wall of the slide channel 1134 is shaped like a third arc by a plane perpendicular to the x-direction, and the outer contour of the fourth ball 144 is shaped like a fourth arc by a plane perpendicular to the x-direction, and the curvature of the third arc is the same as that of the fourth arc. In the y direction, the outer wall of the fourth ball 144 and the inner wall of the slide channel 1134 are combined tightly, and the two opposite sides of the outer wall of the fourth ball 144 are abutted by the two opposite sides of the inner wall of the slide channel 1134.

In this embodiment, the three fourth grooves 1481 are divided into a seventh group and an eighth group, where the seventh group includes one fourth groove 1481, the eighth group includes two fourth grooves 1481, the seventh group corresponds to the first slideway 1157, and the eighth group corresponds to the second slideway 1158. Thus, the seventh group of corresponding fourth balls 144 slide in the first slide way 1157, the eighth group of corresponding fourth balls 144 slide in the second slide way 1113, the seventh group of corresponding fourth balls 144 and the eighth group of corresponding fourth balls 144 are limited in the first slide way 1157 and the second slide way 1158, respectively, and the three fourth balls 144 enclose a triangle, so that the number of the fourth balls 144 is reduced as much as possible on the premise of ensuring the sliding stability, and the sliding resistance can be reduced. In addition, in the y direction, the two opposite sides of the outer wall of the seventh group of corresponding fourth balls 144 are abutted by the two opposite sides of the inner wall of the first slide way 1157, the two opposite sides of the outer wall of the eighth group of corresponding fourth balls 144 are abutted by the two opposite sides of the inner wall of the second slide way 1158, and the three fourth balls 144 form a triangle, so that the second lens assembly 13 can be prevented from shaking or inclining in the y direction, and the imaging quality of the camera module 100 is not affected.

In the description herein, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that changes, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A zoom lens, characterized in that the zoom lens comprises:

a housing;

the lens assembly comprises a first lens assembly, a second lens assembly and a third lens assembly which are arranged in a shell, wherein the second lens assembly and the third lens assembly are positioned on an optical axis of the first lens assembly; and

the driving chip comprises a first control end and a second control end, and the first control end is connected with the second lens assembly and used for controlling the second lens assembly to move along the optical axis relative to the first lens assembly; the second control end is connected with the third lens component and is used for controlling the third lens component to move along the optical axis relative to the first lens component; the effective control bit of the driving chip is larger than or equal to a preset value, so that the minimum moving unit of the zoom lens accords with preset moving precision.

2. The zoom lens according to claim 1, wherein the predetermined value is a positive integer greater than or equal to 13, and the predetermined value and the minimum movement unit are inversely correlated with each other in a case where a movement stroke range of the zoom lens is fixed.

3. The zoom lens of claim 1, wherein the first lens assembly, the second lens assembly and the third lens assembly are sequentially disposed along the optical axis, the first control end and the second control end cooperate to respectively control the second lens assembly and the third lens assembly to move relative to the first lens assembly, so that the zoom lens can be switched between a short-focus state and a long-focus state, and the second control end is further used for controlling the focusing of the third lens assembly in the short-focus state and the long-focus state.

4. The zoom lens according to claim 1, wherein the zoom lens is switchable between a short-focus state and a long-focus state, and the driving chip further comprises a third control end for controlling the third lens component to move along the optical axis, so that the zoom lens realizes focusing in the short-focus state and the long-focus state.

5. The zoom lens of claim 1, further comprising a fourth lens assembly disposed in the housing, wherein the driving chip further comprises a third control end, and the third control end is connected to the fourth lens assembly to control the fourth lens assembly to move along the optical axis relative to the first lens assembly.

6. The zoom lens according to claim 1, further comprising a first driving element and a second driving element, wherein the first control end is connected to the second lens assembly through the first driving element, and the first control end is configured to control the first driving element to move so as to drive the second lens assembly to move along the optical axis relative to the first lens assembly; the second control end is connected with the third lens component through the second driving piece, and the second control end is used for controlling the second driving piece to move so as to drive the third lens component to move along the optical axis relative to the first lens component.

7. The zoom lens of claim 6, wherein the first driving element comprises a first coil and a first magnet, the second driving element comprises a second coil and a second magnet, the first magnet is connected to the second lens assembly, the second magnet is connected to the third lens assembly, the first control end is connected to the first coil, the first control end is used for controlling the current input to the first coil to drive the first magnet to drive the second lens assembly to move along the optical axis relative to the first lens assembly, the second control end is connected to the second coil, and the second control end is used for controlling the current input to the second coil to drive the second magnet to drive the third lens assembly to move along the optical axis relative to the first lens assembly.

8. The zoom lens of claim 1, wherein the housing comprises a substrate, a bearing surface of the substrate is provided with a slide rail, surfaces of the second lens assembly and the third lens assembly opposite to the bearing surface are provided with a ball, and the balls of the second lens assembly and the third lens assembly are slidably connected with the slide rail, so that the second lens assembly and the third lens assembly move relative to the first lens assembly.

9. The zoom lens of claim 1, further comprising a prism assembly and an anti-shake driving member disposed in the housing, wherein the housing comprises a substrate, the prism assembly, the first lens assembly, the second lens assembly and the third lens assembly are sequentially disposed on a carrying surface of the substrate along the optical axis, the driving chip further comprises a first anti-shake control end and a second anti-shake control end, the first anti-shake control end and the second anti-shake control end are connected to the anti-shake driving member, the anti-shake driving member is connected to the prism assembly, the first anti-shake control end is configured to control the anti-shake driving member to move so as to drive the prism assembly to move in a first direction, the second anti-shake control end is configured to control the anti-shake driving member to move so as to drive the prism assembly to move in a second direction, the optical axis, the first direction and the second direction are perpendicular to each other.

10. The zoom lens of claim 9, wherein the first direction is parallel to the bearing surface and perpendicular to the optical axis, the second direction is perpendicular to the bearing surface, and the bearing surface is parallel to the optical axis.

11. The zoom lens according to claim 10, wherein the prism assembly includes a prism including an incident surface, a reflecting surface and an exit surface connected in this order, the first lens assembly is opposite to the incident surface or the exit surface, and the reflecting surface is configured to reflect the light incident from the incident surface so that the light exits from the exit surface.

12. The zoom lens according to claim 1, wherein the second control end is further configured to control the third lens assembly to move closer to or farther from the first lens assembly along the optical axis, and stop moving the third lens assembly when the resolution of the image captured by the zoom lens reaches a preset resolution.

13. A camera module, comprising:

a photosensitive element; and

the zoom lens according to any one of claims 1 to 12, wherein the light-sensing element is disposed on an image side of the zoom lens.

14. An electronic device, comprising:

a housing; and

the camera module of claim 13, mounted on the housing.