Zoom driving device for Alvarez lens

Abstract

The invention belongs to the technical field of precise focusing of an optical system, and particularly relates to an Alvarez lens zoom driving device, which comprises a box body; the upper guide rail mechanism is arranged in the box body in a sliding mode, the upper guide rail mechanism is in transmission connection with a first driving structure, and a first Alvarez lens is installed in the upper guide rail mechanism; the lower guide rail mechanism is in sliding fit with the upper guide rail mechanism, the lower guide rail mechanism is in transmission connection with a second driving structure, and a second Alvarez lens is installed in the lower guide rail mechanism; the first Alvarez lens and the second Alvarez lens are arranged in a central symmetry mode. The first driving structure and the second driving structure are the same in structure and are installed in the box body. Light rays are incident from a hole channel above the box body, sequentially pass through the Alvarez lens I and the Alvarez lens II and are emergent from a hole channel at the bottom of the box body; the first driving structure and the second driving structure respectively drive the upper guide rail mechanism and the lower guide rail mechanism to slide relatively to realize zooming.

Description

Technical Field

[0001] The invention belongs to the technical field of optical system precision focusing, and in particular relates to an Alvarez lens zoom driving device. Background Art

[0002] Tunable focus lenses are an important component of compact optical system applications. Traditional zoom systems usually occupy a large axial space of the entire zoom system and cannot meet the needs of some applications that have strict requirements on volume, such as mobile devices or small aerial photography drones.

[0003] The Alvarez lens is a novel free-form optical element, which includes a pair of optical elements with complementary cubic surface profiles. Zoom is achieved through the relative lateral displacement of the two optical elements in a direction perpendicular to the optical axis. In the field of micro-optical zoom systems, the Alvarez lens has significantly reduced its size compared to traditional axially movable zoom systems due to its unique lateral displacement zoom mechanism.

[0004] However, the current Alvarez lens zoom structure is limited in form, which limits the performance potential of the Alvarez lens. Therefore, an Alvarez lens zoom drive device is urgently needed to solve the problem. Summary of the invention

[0005] The object of the present invention is to provide an Alvarez lens zoom driving device to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An Alvarez lens zoom driving device, comprising:

[0008] A box body, wherein a hole for light to pass through is opened on the box body;

[0009] An upper guide rail mechanism is slidably disposed in the box body, the upper guide rail mechanism is transmission-connected to a driving structure 1, and an Alvarez lens 1 is installed in the upper guide rail mechanism;

[0010] A lower guide rail mechanism is slidably disposed in the box body, the lower guide rail mechanism is slidably matched with the upper guide rail mechanism, the lower guide rail mechanism is transmission-connected with a second driving structure, and a second Alvarez lens is installed in the lower guide rail mechanism;

[0011] The Alvarez lens 1 is centrally symmetrically arranged with the Alvarez lens 2;

[0012] The driving structure 1 has the same structure as the driving structure 2 and is installed in the box body;

[0013] The Alvarez lens 1 and the Alvarez lens 2 are optically connected. After the light enters through the upper hole of the box body, it passes through the Alvarez lens 1 and the Alvarez lens 2 in sequence and exits from the bottom hole of the box body.

[0014] The driving structure 1 and the driving structure 2 respectively drive the upper guide rail mechanism and the lower guide rail mechanism to slide relatively to achieve zooming.

[0015] Optionally, the box body includes an outer shell assembly and an inner shell assembly. The inner shell assembly is fixedly connected to the inner side of the outer shell assembly, and the inner shell assembly is slidably connected to the upper guide rail mechanism and the lower guide rail mechanism.

[0016] Optionally, the inner shell assembly includes an inner shell body 1 and an inner shell body 2. The inner shell body 1 and the inner shell body 2 have the same structure, and the inner shell body 1 and the inner shell body 2 are symmetrically arranged about the center. The inner shell body 1 and the inner shell body 2 are fixedly connected inside the outer shell assembly. The inner shell body 1 is slidably matched with the lower guide rail mechanism, and the inner shell body 2 is slidably matched with the upper guide rail mechanism.

[0017] The fixed end of the driving structure 1 is fixedly connected to the inner wall of the inner shell body 1, and the movable end of the driving structure 1 is fixedly connected to the upper guide rail mechanism.

[0018] The fixed end of the driving structure 2 is fixedly connected to the inner wall of the inner shell body 2, and the movable end of the driving structure 2 is fixedly connected to the lower guide rail mechanism.

[0019] Optionally, the outer shell assembly includes a lower metal shell and an upper metal shell. The lower metal shell and the upper metal shell have the same structure, and the lower metal shell and the upper metal shell are symmetrically arranged about the center. A plurality of rectangular holes are opened on the side walls of the lower metal shell and the upper metal shell.

[0020] A plurality of rectangular protrusions are fixedly connected to the outer walls of the inner shell body 1 and the inner shell body 2. The plurality of rectangular protrusions are arranged in one-to-one correspondence with the plurality of rectangular holes. The inner shell body 1 and the lower metal shell, and the inner shell body 2 and the upper metal shell are fixed by the interference fit between the rectangular protrusions and the rectangular holes.

[0021] Optionally, holes are respectively opened at the centers of the upper guide rail mechanism and the lower guide rail mechanism. The Alvarez lens 1 is fixedly connected in the hole of the upper guide rail mechanism, and the Alvarez lens 2 is fixedly connected in the hole of the lower guide rail mechanism.

[0022] Optionally, through holes are respectively opened at the centers of the inner shell body 1 and the inner shell body 2 and the centers of the lower metal shell and the upper metal shell. The plurality of through holes are coaxially arranged.

[0023] Optionally, both the first driving structure and the second driving structure are voice coil motors.

[0024] Optionally, control boards are fixed to the inner walls of the first inner housing and the second inner housing respectively. The control boards are electrically connected to the corresponding first driving structure and second driving structure through flexible cables, and the flexible cables are used to transmit electrical signals for controlling the actions of the voice coil motors.

[0025] Optionally, the voice coil motor includes a permanent magnet and a coil. The coil is electrically connected to the flexible cable. The coil of one of the voice coil motors is fixedly connected to the inner wall of the first inner housing, and the coil of the other voice coil motor is fixedly connected to the inner wall of the second inner housing;

[0026] The coil is in transmission connection with the permanent magnet. The permanent magnet of one of the voice coil motors is fixedly connected to the outer wall of the lower guide rail mechanism, and the permanent magnet of the other voice coil motor is fixedly connected to the outer wall of the upper guide rail mechanism.

[0027] Optionally, a Hall sensor is provided between the coil and the permanent magnet, and the Hall sensor is fixedly arranged at the center of the coil.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] During use, the upper guide rail mechanism and the lower guide rail mechanism are driven to slide relative to each other through the first driving structure and the second driving structure, so that the first Alvarez lens and the second Alvarez lens slide relative to each other, realizing parallel, convergent or divergent output of light. The first driving structure and the second driving structure can quickly drive the first Alvarez lens and the second Alvarez lens to move to any specified position, realizing a fast response for focusing, and realizing precise focusing while maintaining the miniaturization and compactness of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0031] Figure 1 is the overall structural schematic diagram of the Alvarez zoom lens driving device of the present invention;

[0032] Figure 2 is the exploded view of the Alvarez zoom lens driving device of the present invention;

[0033] Figure 3 It is a schematic diagram of the guide rail mechanism motion assembly of the Alvarez zoom lens driving device of the present invention;

[0034] Figure 4 is an exploded view of a guide rail mechanism motion assembly of an Alvarez zoom lens driving device of the present invention;

[0035] Figure 5 is a schematic diagram of the internal displacement of the Alvarez zoom lens driving device of the present invention;

[0036] Figure 6 It is a schematic diagram of the housing structure of the Alvarez zoom lens driving device of the present invention;

[0037] Figures 7 - 9 is a schematic diagram of the zoom state of the Alvarez zoom lens driving device of the present invention;

[0038] Among them, 1. Hall sensor; 2. Coil; 3. Upper guide rail mechanism; 4. Inner shell one; 5. Lower metal shell; 6. Upper metal shell; 7. Alvarez lens one; 8. Permanent magnet; 9. Lower guide rail mechanism; 10. Alvarez lens two; 11. Rectangular groove one; 12. Outer guide rail; 13. Rectangular guide rail; 14. Hole; 15. Rectangular groove two; 16. Rectangular protrusion; 17. Rectangular hole; 18. Flexible cable; 19. Incident light; 20. Outgoing light one; 21. Outgoing light two; 22. Outgoing light three; 23. Inner shell two. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Reference Figures 1 to 9 The present invention discloses an Alvarez lens zoom driving device, comprising:

[0042] A box body, wherein a hole for light to pass through is opened on the box body;

[0043] An upper guide rail mechanism 3 is slidably disposed in the box body, the upper guide rail mechanism 3 is transmission-connected with a driving structure 1, and an Alvarez lens 7 is installed in the upper guide rail mechanism 3;

[0044] The lower guide rail mechanism 9 is slidably arranged inside the box body. The lower guide rail mechanism 9 is slidably engaged with the upper guide rail mechanism 3. The lower guide rail mechanism 9 is drivingly connected to a second driving structure. An Alvarez lens II 10 is installed inside the lower guide rail mechanism 9;

[0045] The Alvarez lens I 7 and the Alvarez lens II 10 are symmetrically arranged about the center;

[0046] The first driving structure and the second driving structure have the same structure and are installed inside the box body;

[0047] The Alvarez lens I 7 and the Alvarez lens II 10 are optically connected. After the light enters through the upper hole of the box body, it passes through the Alvarez lens I 7 and the Alvarez lens II 10 in sequence and exits through the bottom hole of the box body;

[0048] The first driving structure and the second driving structure respectively drive the upper guide rail mechanism 3 and the lower guide rail mechanism 9 to slide relative to each other to achieve zooming.

[0049] During use, the first driving structure and the second driving structure respectively drive the upper guide rail mechanism 3 and the lower guide rail mechanism 9 to slide relative to each other, so that the Alvarez lens I 7 and the Alvarez lens II 10 slide relative to each other, realizing parallel, converging or diverging output of light. The first driving structure and the second driving structure can quickly drive the Alvarez lens I 7 and the Alvarez lens II 10 to move to any specified position, realizing fast response of focusing, and achieving precise focusing while maintaining the miniaturization and compactness of the system.

[0050] The upper guide rail mechanism 3 and the lower guide rail mechanism 9 are made by nylon injection molding process or precision micro-nano 3D molding printing. Through holes 14 are respectively formed in the middle of the upper guide rail mechanism 3 and the lower guide rail mechanism 9 for light to pass through and fix the lenses. The upper guide rail mechanism 3 and the lower guide rail mechanism 9 have the same structure and are symmetrically arranged about the center.

[0051] The upper guide rail mechanism 3 has an L-shaped structure. A rectangular groove I 11 is machined on the outside of one end of the upper guide rail mechanism 3. The rectangular groove I 11 is located at one end far from the vertical section of the upper guide rail mechanism 3. The other end of the upper guide rail mechanism 3 is provided with an outer guide rail 12 and a rectangular guide rail 13. Both the outer guide rail 12 and the rectangular guide rail 13 are arranged on the vertical section of the upper guide rail mechanism 3. The rectangular guide rail 13 is located on the side of the vertical section of the upper guide rail mechanism 3 close to the rectangular groove I 11, and the outer guide rail 12 is located on the side of the vertical section of the upper guide rail mechanism 3 far from the rectangular groove I 11.

[0052] The rectangular groove 11 of the upper guide rail mechanism 3 and the rectangular guide rail 13 of the lower guide rail mechanism 9 are mutually engaged to achieve relative sliding. Specifically, the upper guide rail mechanism 3 and the lower guide rail mechanism 9 are symmetrically arranged about the center, and the rectangular groove 11 of the upper guide rail mechanism 3 is in sliding fit with the rectangular guide rail 13 of the lower guide rail mechanism 9.

[0053] The contact surfaces of the rectangular groove 11 and the rectangular guide rail 13 are chemically treated to ensure roughness, making the movement smooth and preventing jamming.

[0054] As an alternative embodiment, the box body includes an outer shell assembly and an inner shell assembly. The inner shell assembly is fixedly connected to the inner side of the outer shell assembly, and the inner shell assembly is slidably connected to the upper guide rail mechanism 3 and the lower guide rail mechanism 9.

[0055] As an alternative embodiment, the inner shell assembly includes an inner shell body 4 and an inner shell body 23. The inner shell body 4 and the inner shell body 23 have the same structure, and the inner shell body 4 and the inner shell body 23 are symmetrically arranged about the center. The inner shell body 4 and the inner shell body 23 are fixedly connected within the outer shell assembly. The inner shell body 4 is in sliding fit with the lower guide rail mechanism 9, and the inner shell body 23 is in sliding fit with the upper guide rail mechanism 3;

[0056] The fixed end of the driving structure 1 is fixedly connected to the inner wall of the inner shell body 4, and the movable end of the driving structure 1 is fixedly connected to the upper guide rail mechanism 3;

[0057] The fixed end of the driving structure 2 is fixedly connected to the inner wall of the inner shell body 23, and the movable end of the driving structure 2 is fixedly connected to the lower guide rail mechanism 9.

[0058] As an alternative embodiment, the outer shell assembly includes a lower metal shell 5 and an upper metal shell 6. The lower metal shell 5 and the upper metal shell 6 have the same structure, and the lower metal shell 5 and the upper metal shell 6 are symmetrically arranged about the center. A plurality of rectangular holes 17 are provided on the side walls of the lower metal shell 5 and the upper metal shell 6;

[0059] A plurality of rectangular protrusions 16 are fixedly connected to the outer walls of the inner shell body 4 and the inner shell body 23. The plurality of rectangular protrusions 16 are arranged in one-to-one correspondence with the plurality of rectangular holes 17. The inner shell body 4 and the lower metal shell 5, and the inner shell body 23 and the upper metal shell 6 are fixed by the interference fit between the rectangular protrusions 16 and the rectangular holes 17.

[0060] As an alternative embodiment, holes 14 are respectively provided at the centers of the upper guide rail mechanism 3 and the lower guide rail mechanism 9. The Alvarez lens 1 is fixedly connected within the hole 14 of the upper guide rail mechanism 3, and the Alvarez lens 2 is fixedly connected within the hole 14 of the lower guide rail mechanism 9.

[0061] The holes 14 machined in the middle of the upper guide rail mechanism 3 and the lower guide rail mechanism 9 are used to fix the Alvarez lens.

[0062] As an alternative embodiment, through holes are provided at the centers of the first inner housing 4 and the second inner housing 23, and also at the centers of the lower metal housing 5 and the upper metal housing 6, and a plurality of through holes are coaxially arranged.

[0063] The first inner housing 4 and the second inner housing 23 are used to constrain the upper guide mechanism 3 and the lower guide mechanism 9, and the first inner housing 4 and the second inner housing 23 have the same structure and are symmetrically arranged about the center.

[0064] The first inner housing 4 and the second inner housing 23 are made by nylon injection molding process or precision micro-nano 3D forming and printing process, and the middle through hole is for light to pass through.

[0065] The first inner housing 4 has an L-shaped structure. A rectangular groove two 15 with an inclined angle is machined on the inner side of the vertical section of the first inner housing 4, and a plurality of rectangular protrusions 16 are fixedly connected to the outer side of the vertical section of the first inner housing 4.

[0066] The rectangular groove two 15 is used for sliding cooperation with the outer guide 12. Specifically, the rectangular groove two 15 of the first inner housing 4 is in sliding cooperation with the outer guide 12 of the lower guide mechanism 9, and the rectangular groove two 15 of the second inner housing 23 is in sliding cooperation with the outer guide 12 of the upper guide mechanism 3.

[0067] The rectangular groove two 15 enables the upper guide mechanism 3 and the lower guide mechanism 9 to slide relative to each other within the frame formed by the first inner housing 4 and the second inner housing 23, and at the same time restricts the lateral movement.

[0068] As an alternative embodiment, both the first driving structure and the second driving structure are voice coil motors.

[0069] As an alternative embodiment, control boards are fixed on the inner walls of the first inner housing 4 and the second inner housing 23. The control boards are electrically connected to the corresponding first driving structure and second driving structure through flexible cables 18, and the flexible cables 18 are used to transmit electrical signals for controlling the actions of the voice coil motors.

[0070] As an alternative embodiment, the voice coil motor includes a permanent magnet 8 and a coil 2. The coil 2 is electrically connected to the flexible cable 18. The coil 2 of one voice coil motor is fixedly connected to the inner wall of the first inner housing 4, and the coil 2 of the other voice coil motor is fixedly connected to the inner wall of the second inner housing 23;

[0071] The coil 2 is in transmission connection with the permanent magnet 8. The permanent magnet 8 of one voice coil motor is fixedly connected to the outer wall of the lower guide mechanism 9, and the permanent magnet 8 of the other voice coil motor is fixedly connected to the outer wall of the upper guide mechanism 3.

[0072] As an alternative embodiment, a Hall sensor 1 is provided between the coil 2 and the permanent magnet 8, and the Hall sensor 1 is fixedly arranged at the center of the coil 2.

[0073] On the outer sides of the upper guide rail mechanism 3 and the lower guide rail mechanism 9, grooves for fitting the permanent magnet 8 are machined. The grooves are located on the side away from the rectangular groove 11, and the permanent magnet 8 is fixed to the upper guide rail mechanism 3 and the lower guide rail mechanism 9 by dispensing glue.

[0074] On the inner sides of the vertical sections of the first inner housing 4 and the second inner housing 23, flexible flat cables 18 are fixed by dispensing glue. The Hall sensor 1 and the coil 2 are integrated together through the flexible flat cable 18, and both the Hall sensor 1 and the coil 2 are fixedly connected to the corresponding first inner housing 4 or second inner housing 23.

[0075] During assembly, the coil 2 and the permanent magnet 8 are on the same horizontal line.

[0076] The rectangular protrusions 16 machined on the outer sides of the vertical sections of the first inner housing 4 and the second inner housing 23 are used to cooperate with the rectangular holes 17 opened on the external lower metal housing 5 and the upper metal housing 6 to achieve alignment assembly and fixed by hot melt welding.

[0077] The structure for connecting and fixing the lower metal housing 5 and the upper metal housing 6 is bent from a metal thin plate into an L-shaped structure. The lower metal housing 5 and the upper metal housing 6 have the same structure and are symmetrically arranged about the center. Rectangular holes 17 are machined on the vertical sections of the lower metal housing 5 and the upper metal housing 6, which are used to cooperate with the rectangular protrusions 16 on the first inner housing 4 and the second inner housing 23 to achieve precise assembly and facilitate hot melt welding.

[0078] During operation, the internal upper and lower guide rail mechanisms move along the mutually engaged rectangular slide rails and the slide rails engaged with the inner housing along the slide rail direction. When the slide rail mechanism is machined, the roughness is controlled by chemical treatment, and a low-viscosity lubricating oil is used to make its movement smooth, avoiding jamming and wear.

[0079] When the present invention realizes precise focusing, first, the voice coil motor driven by the bidirectional drive current control IC pre-applies current to precisely control the initial position, which is used to compensate for the center alignment error during assembly.

[0080] Then, by applying forward current and reverse current respectively, the upper and lower guide rail mechanisms are driven by the Ampere force to drive the Alvarez lens to achieve lateral movement.

[0081] Figure 7 The figure shows a state of the Alvarez lens when pre-applying current. The Alvarez lens is in a symmetric state, and the lens group is equivalent to a flat glass, which neither diverges nor converges the incident light 19 to form the outgoing light 20.

[0082] Figure 8 The figure shows a state of the Alvarez lens when applying forward current. The Alvarez lens group is equivalent to a convex lens, which converges the incident light 19 to form the outgoing light 21.

[0083] Figure 9 Shown is a state of the Alvarez lens when a reverse current is applied. The Alvarez lens group is equivalent to a concave lens, which diverges the incident light 19 to form the outgoing light 22.

[0084] In summary, by precisely controlling the applied bidirectional current, driving the permanent magnet to drive the lateral movement of the Alvarez lens, and presenting different states of the Alvarez lens group, precise control of light is achieved, thereby achieving a zoom effect.

[0085] Compared with the traditional technology, the present application has the following advantages:

[0086] When the present invention operates, bidirectional fine currents are applied to the coils 2 on both the left and right sides. Under the action of the Ampere force, the two permanent magnets 8 are displaced. The permanent magnets 8 drive the upper and lower guide rail mechanisms to translate along the guide rail direction. The Hall sensor 1 senses the Gaussian quantity to accurately judge the relative position of the moving components and form a feedback signal. When the two coils 2 apply a forward current, the Alvarez lens undergoes relative movement to achieve light divergence; when a reverse current is applied, the Alvarez lens achieves light convergence; the Hall sensor 1 senses the positions of the two lenses and precisely controls the diopter of focusing and achieves fast dynamic response adjustment through closed-loop feedback.

[0087] The present invention realizes the relative constraint and displacement of the two Alvarez lenses through the cooperation of the rectangular chute guide rail mechanism.

[0088] The present invention controls the voice coil motor through a closed-loop control IC driven by a bidirectional current, which has good control flexibility. The specific method is to adjust the position in real time according to the current magnitude and Gaussian quantity to achieve dynamic fine adjustment during the focusing process. It is also possible to pre-apply a current to correct the position error and improve the motion accuracy. Therefore, the present invention can ensure that the Alvarez lens group realizes relative displacement at any position and distance, corrects the axial error in the lens assembly, and at the same time has a simple structure, strong controllability, and high reliability, and is suitable for the driving application of Alvarez zoom lenses.

[0089] The present invention adopts a lateral displacement zoom mechanism, occupies a small axial space, and can be combined with other spherical or aspherical lens groups to meet special performance requirements.

[0090] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0091] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An Alvarez lens zoom drive device, characterized in that: include: A box body, wherein a hole for light to pass through is opened on the box body; An upper guide rail mechanism (3) is slidably arranged in the box body, the upper guide rail mechanism (3) is transmission-connected to a driving structure 1, and an Alvarez lens 1 (7) is installed in the upper guide rail mechanism (3); A lower guide rail mechanism (9) is slidably arranged in the box body, the lower guide rail mechanism (9) is slidably matched with the upper guide rail mechanism (3), the lower guide rail mechanism (9) is transmission-connected with a second driving structure, and an Alvarez lens (10) is installed in the lower guide rail mechanism (9); The Alvarez lens 1 (7) and the Alvarez lens 2 (10) are centrally symmetrically arranged; The driving structure 1 has the same structure as the driving structure 2 and is installed in the box body; The Alvarez lens 1 (7) is optically connected to the Alvarez lens 2 (10), and after the light is incident from the hole above the box body, it passes through the Alvarez lens 1 (7) and the Alvarez lens 2 (10) in sequence and is emitted from the hole at the bottom of the box body; The driving structure 1 and the driving structure 2 respectively drive the upper guide rail mechanism (3) and the lower guide rail mechanism (9) to slide relative to each other to achieve zooming.

2. The Alvarez lens zoom drive device according to claim 1, characterized in that: The box body comprises an outer shell component and an inner shell component, wherein the inner shell component is fixedly connected to the inner side of the outer shell component, and the inner shell component is slidably connected to the upper guide rail mechanism (3) and the lower guide rail mechanism (9).

3. The Alvarez lens zoom drive device according to claim 2, characterized in that: The inner shell assembly comprises an inner shell one (4) and an inner shell two (23), the inner shell one (4) and the inner shell two (23) having the same structure, the inner shell one (4) and the inner shell two (23) being centrally symmetrically arranged, the inner shell one (4) and the inner shell two (23) being fixedly connected to the outer shell assembly, the inner shell one (4) being slidably matched with the lower guide rail mechanism (9), and the inner shell two (23) being slidably matched with the upper guide rail mechanism (3); The fixed end of the driving structure 1 is fixedly connected to the inner wall of the inner shell 1 (4), and the movable end of the driving structure 1 is fixedly connected to the upper guide rail mechanism (3); The fixed end of the second driving structure is fixedly connected to the inner wall of the second inner shell (23), and the movable end of the second driving structure is fixedly connected to the lower guide rail mechanism (9).

4. The Alvarez lens zoom drive device according to claim 3, characterized in that: The housing assembly comprises a lower metal shell (5) and an upper metal shell (6); the lower metal shell (5) and the upper metal shell (6) have the same structure; the lower metal shell (5) and the upper metal shell (6) are centrally symmetrically arranged; and a plurality of rectangular holes (17) are provided on the side walls of the lower metal shell (5) and the upper metal shell (6); The outer walls of the inner shell 1 (4) and the inner shell 2 (23) are both fixedly connected with a plurality of rectangular protrusions (16), and the plurality of rectangular protrusions (16) are arranged in a one-to-one correspondence with the plurality of rectangular holes (17). The inner shell 1 (4) and the lower metal shell (5), the inner shell 2 (23) and the upper metal shell (6) are all fixed by interference fit between the rectangular protrusions (16) and the rectangular holes (17).

5. The Alvarez lens zoom drive device according to claim 1, characterized in that: Holes (14) are respectively provided at the center of the upper guide rail mechanism (3) and the lower guide rail mechanism (9); the Alvarez lens 1 (7) is fixedly connected to the hole (14) of the upper guide rail mechanism (3); and the Alvarez lens 2 (10) is fixedly connected to the hole (14) of the lower guide rail mechanism (9).

6. The Alvarez lens zoom driving device according to claim 4, characterized in that: Through holes are provided at the centers of the inner shell 1 (4) and the inner shell 2 (23) and at the centers of the lower metal shell (5) and the upper metal shell (6), and a plurality of the through holes are coaxially arranged.

7. The Alvarez lens zoom driving device according to claim 3, characterized in that: The driving structure 1 and the driving structure 2 are both voice coil motors.

8. The Alvarez lens zoom driving device according to claim 7, characterized in that: A control board is fixed to the inner wall of the inner shell 1 (4) and the inner wall of the inner shell 2 (23). The control board is electrically connected to the corresponding driving structure 1 and the driving structure 2 via a flexible flat cable (18). The flexible flat cable (18) is used to transmit an electrical signal for controlling the action of the voice coil motor.

9. The Alvarez lens zoom driving device according to claim 8, characterized in that: The voice coil motor comprises a permanent magnet (8) and a coil (2), wherein the coil (2) is electrically connected to the flexible flat cable (18), wherein the coil (2) of one voice coil motor is fixedly connected to the inner wall of the first inner shell (4), and the coil (2) of the other voice coil motor is fixedly connected to the inner wall of the second inner shell (23); The coil (2) is transmission-connected to the permanent magnet (8), wherein the permanent magnet (8) of one voice coil motor is fixedly connected to the outer wall of the lower guide rail mechanism (9), and the permanent magnet (8) of the other voice coil motor is fixedly connected to the outer wall of the upper guide rail mechanism (3).

10. The Alvarez lens zoom driving device according to claim 9, characterized in that: A Hall sensor (1) is provided between the coil (2) and the permanent magnet (8), and the Hall sensor (1) is fixedly arranged at the center of the coil (2).

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