Zoom mechanism and lens driving device

Abstract

The invention belongs to the technical field of optical imaging equipment, and particularly relates to a zoom mechanism and a lens driving device.The zoom mechanism comprises a shell, a base and a carrier, the shell and the base form a hollow cavity, and the carrier is located in the hollow cavity and can move up and down in the hollow cavity; a magnet is arranged on the inner wall of the shell, a built-in metal piece is arranged on the carrier, and the built-in metal piece comprises an upper magnetic attraction ring and a lower magnetic attraction ring; when the carrier is in an initial state, the upper magnetic ring is positioned on the inner side above the magnet, and the lower magnetic ring is positioned on the inner side below the magnet; when the carrier moves to the uppermost part, the lower magnetic attraction ring and the bottom end of the magnet attract each other, so that the carrier is locked at a high position; when the carrier moves to the lowest position, the upper magnetic attraction ring and the top end of the magnet attract each other, so that low-position locking of the carrier is achieved. Through the design of the upper magnetic attraction ring and the lower magnetic attraction ring, the upper magnetic attraction ring and the lower magnetic attraction ring are matched with the magnets, so that the two-gear locking zoom lens has a two-gear locking zoom effect.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging equipment technology, specifically relating to a zoom mechanism and a lens driving device. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones or digital cameras) have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards convenient and thinner designs to provide users with more choices.

[0003] In practical applications, to meet the shooting needs of diverse scenarios, lenses require frequent focusing and image stabilization operations. Under current technology, a lens drive mechanism is typically used to achieve three-axis lens movement. Specifically, the lens drive mechanism moves the lens along the optical axis to adjust the focal length, and also moves the lens perpendicular to the optical axis to prevent lens shake, thus achieving autofocus and image stabilization. In other words, existing lens drive mechanisms generally rely on a carrier and a lens connected to the carrier to achieve three-axis movement, thereby realizing the goals of autofocus and image stabilization.

[0004] The aforementioned method of achieving optical zoom and optical image stabilization through the movement of the same component (carrier) is difficult to effectively solve the problem of defocusing during shooting because the range of motion of the carrier is limited by factors such as weight and volume.

[0005] In addition, in the existing technology, there is no locking function when the carrier moves to an extreme position during the focusing process, which limits the focusing range of the carrier. Summary of the Invention

[0006] The present invention addresses the above-mentioned technical problems by providing a zoom mechanism and a lens driving device.

[0007] A zoom mechanism includes a housing, a base, and a carrier. The housing and the base form a hollow cavity, and the carrier is located in the hollow cavity and can move up and down in the hollow cavity.

[0008] The inner wall of the outer shell is provided with a magnet, and the carrier is provided with an internal metal component, the internal metal component including an upper magnetic ring and a lower magnetic ring, the upper magnetic ring being located above the lower magnetic ring;

[0009] When the carrier is in its initial state, the upper magnetic ring is located on the inner side above the magnet, and the lower magnetic ring is located on the inner side below the magnet.

[0010] When the carrier moves to the top, the lower magnetic ring attracts the bottom of the magnet, causing the carrier to be locked in a high position.

[0011] When the carrier moves to the bottom, the upper magnetic ring attracts the top of the magnet, causing the carrier to be locked at a low position.

[0012] Optionally, the built-in metal component is installed on the inner wall of the carrier, on the outer wall of the carrier, or embedded inside the carrier.

[0013] Optionally, the outer shell has a through hole that connects the upper and lower parts, and the magnet is four in number and has an arc-shaped structure. The four magnets are evenly arranged circumferentially along the inner wall of the through hole.

[0014] Optionally, the outer shell has a through hole that connects the upper and lower parts, an upper sealing ring is provided on the inner wall of the through hole, the magnet is disposed on the inner wall of the through hole, there is a receiving space between the top of the magnet and the upper sealing ring, and the carrier is confined within the through hole below the upper sealing ring.

[0015] Optionally, the magnets are four in number and have an arc-shaped structure;

[0016] Four limiting protrusions are provided circumferentially on the inner wall of the through hole of the outer shell. The four limiting protrusions are located below the upper sealing ring. The four limiting protrusions are arranged symmetrically in pairs, and a magnet is installed between two adjacent limiting protrusions.

[0017] Optionally, the top edge of the carrier is provided with an annular top protrusion, and the outer periphery of the top protrusion is provided with a relief groove for avoiding the limiting protrusion. The top protrusion is located within the receiving space, and the distance between the top protrusion and the upper sealing ring is the movement range of the carrier.

[0018] Optionally, of the four limiting protrusions, two symmetrical limiting protrusions serve as guide protrusions, and guide grooves are provided on the sidewalls of the guide protrusions;

[0019] Two side protrusions are provided on the outer sidewall of the carrier. The two side protrusions are symmetrically arranged. A ball is provided on the side protrusion. The side protrusion is inserted into the guide groove, and the ball abuts against the groove wall of the guide groove.

[0020] Optionally, the built-in metal component further includes a side magnetic plate, which is disposed on one side of the carrier. The side magnetic plate has a magnet on its outer side, and the side magnetic plate and the magnet on its outer side are disposed opposite to each other and attract each other.

[0021] Optionally, the side magnetic suction plate is located between the upper magnetic suction ring and the lower magnetic suction ring, with the upper end of the side magnetic suction plate connected to the upper magnetic suction ring and the lower end of the side magnetic suction plate connected to the lower magnetic suction ring.

[0022] Optionally, the base is provided with a limiting groove corresponding to the side protrusion, and the bottom end of the side protrusion is inserted into the limiting groove.

[0023] Optionally, a coil is wound around the outside of the carrier, and the coil is arranged opposite to the magnet inside and outside. After the coil is energized, the carrier moves up and down relative to the base and the outer shell.

[0024] Optionally, the bottom end of the carrier is provided with an elastic support plate with an annular structure. The elastic support plate has an inner ring and an outer ring. The inner ring is connected to the outer ring and is connected to the bottom end of the carrier. The outer ring is suspended or connected to the base. One end of the outer ring is provided with a wiring pin. The wiring pin extends out of the base from the interface clearance groove on the base and is used for electrical connection with an external circuit.

[0025] The coil is connected to the elastic support plate through the built-in circuitry within the carrier, and the elastic support plate supplies power to the coil.

[0026] Optionally, the elastic support plate is an FPC plate or a spring structure.

[0027] A lens driving device, the lens driving device including the zoom mechanism described in this invention.

[0028] Beneficial effects: The present invention has at least one or more of the following advantages:

[0029] 1. This invention achieves zoom operation of the carrier and the lens installed within it by moving the carrier relative to the base and the outer casing in the vertical direction. During zoom operation, due to the upper and lower magnetic rings provided on the carrier, when the carrier moves to the uppermost position, an attractive force is generated between the lower magnetic ring and the bottom of the magnet to maintain the carrier in a locked state at the highest position; when the carrier moves to the lowermost position, an attractive force is generated between the upper magnetic ring and the top of the magnet to maintain the carrier in a locked state at the lowest position, thereby enabling the invention to achieve a two-level locked zoom effect.

[0030] 2. The present invention, through the design of four magnet structures, works in conjunction with the coil system to significantly enhance the driving force of the carrier in the zoom direction, thereby effectively improving the response efficiency and operating accuracy of the overall system.

[0031] 3. This invention cleverly employs a top-protruding structural design. After the carrier is installed, the top protrusion is precisely located within the pre-defined accommodating space. Therefore, the entire zooming process of the carrier is essentially equivalent to the top protrusion moving and adjusting vertically within this accommodating space, and the limit range of its vertical movement directly defines the operable range of the carrier's zooming.

[0032] 4. This invention cleverly utilizes a ball bearing structure to provide efficient auxiliary guidance during the zoom operation of the carrier, ensuring smooth and precise movement. Furthermore, the attraction force generated between the side magnetic plate and the corresponding magnet ensures that the balls between the side protrusion and the guide protrusion maintain a tight contact, effectively preventing the balls from slipping out of their grooves during operation and improving the reliability and durability of the entire mechanism.

[0033] 5. The carrier of this invention mainly relies on a ring-shaped elastic support plate to provide stable and reliable support. This elastic support plate not only supports the carrier itself but also provides a continuous and stable power supply to the coil located on its outer side. Due to the ring-shaped structure design, the elastic support plate itself possesses a certain elastic potential energy. When the carrier performs zooming motion, this elastic potential energy can effectively store energy, thereby assisting the carrier to quickly and smoothly return to its initial position after the motion ends, thus enhancing the overall reset performance and operational stability of the system. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of one structure of the present invention;

[0035] Figure 2 for Figure 1 The main view;

[0036] Figure 3 for Figure 2 AA section view;

[0037] Figure 4 for Figure 1 Exploded view;

[0038] Figure 5 for Figure 4 Further exploded view;

[0039] Figure 6 This is a schematic diagram of the structure of the outer shell of the present invention;

[0040] Figure 7 This is a schematic diagram showing the positional relationship between the outer shell and the carrier of the present invention;

[0041] Figure 8 for Figure 7 Exploded view;

[0042] Figure 9 This is a schematic diagram showing the positional relationship between the base and the carrier of the present invention;

[0043] Figure 10 for Figure 9 Exploded view;

[0044] Figure 11This is a schematic diagram showing the positional relationship between the base and the FPC board of the present invention;

[0045] Figure 12 This is a schematic diagram of one structure of the lens driving device of the present invention. Detailed Implementation

[0046] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0047] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0048] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0049] In the following description, in order to clearly demonstrate the structure and operation of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0050] In the following description, the vertical axis is... Figure 3 The vertical direction within an optical element can also be called the longitudinal direction or the optical axis direction. The optical axis direction represents the direction of light propagation within an optical element; it is an abstract concept and does not refer to a physical axis.

[0051] Example 1:

[0052] Reference Figures 1 to 11 This invention provides a zoom mechanism that is applied in a lens driving device and can be used as part of the lens driving device to realize the zoom operation of the lens. The zoom mechanism includes a housing 10, a base 20, and a carrier 30.

[0053] The outer shell 10 and the base 20 are detachably connected to form a hollow cavity. Preferably, the outer shell 10 and the base 20 are connected by a snap-fit ​​mechanism to form the hollow cavity. The carrier 30 is located within the hollow cavity and can move up and down within the hollow cavity.

[0054] The middle of the outer shell 10, the base 20 and the carrier 40 is provided with a lens through hole that is connected vertically in the vertical direction to avoid or accommodate the lens. The lens is installed inside the carrier 30. The carrier 30 and the lens installed inside the carrier 30 move vertically relative to the outer shell 10 and the base 20 to realize the zoom operation of the lens.

[0055] Reference Figure 3 , Figure 5 , Figure 7 and Figure 8 The inner wall of the outer shell 10 is provided with a magnet 40.

[0056] Reference Figure 10 The carrier 30 is provided with an internal metal component, which includes an upper magnetic ring 51 and a lower magnetic ring 52, with the upper magnetic ring 51 located above the lower magnetic ring 52.

[0057] like Figure 3 As shown, when the carrier 30 is in its initial state, the upper magnetic ring 51 is located above and inside the magnet 40, and the lower magnetic ring 52 is located below and inside the magnet 40. That is, the magnet 40 is located outside the space between the upper magnetic ring 51 and the lower magnetic ring 52, and both ends of the magnet 40 do not extend beyond the upper magnetic ring 51 and the lower magnetic ring 52. The initial state refers to the stationary state of the carrier 30 when no zooming operation is performed.

[0058] As the carrier 30 moves upward, the upper magnetic ring 51 moves further and further away from the top of the magnet 40, while the lower magnetic ring 52 moves closer and closer to the bottom of the magnet 40. When the carrier 30 moves to the top of its travel, the lower magnetic ring 52 and the bottom of the magnet 40 attract each other, causing the carrier 30 to achieve high-position locking.

[0059] As the carrier 30 moves downward, the upper magnetic ring 51 gets closer and closer to the top of the magnet 40, while the lower magnetic ring 52 gets further and further away from the bottom of the magnet 40. When the carrier 30 moves to the bottom of its travel, the upper magnetic ring 51 and the top of the magnet 40 attract each other, causing the carrier 30 to achieve low-position locking.

[0060] This invention enables zooming of the carrier 30 and the lens mounted within it by allowing the carrier 30 to move vertically relative to the base 20 and the outer casing 10. During zooming, due to the design of the upper magnetic ring 51 and the lower magnetic ring 52 on the carrier 30, when the carrier 30 moves to its highest position, the lower magnetic ring 52 has an attractive force with the bottom end of the magnet 40, keeping the highest position of the carrier 30 locked. When the carrier 30 moves to its lowest position, the upper magnetic ring 51 has an attractive force with the top end of the magnet 40, keeping the lowest position of the carrier 30 locked. This results in a two-level zooming effect.

[0061] In one embodiment, the built-in metal component is embedded inside the carrier 30.

[0062] In practical implementation, the built-in metal parts can also be installed on the inner wall or outer wall of the carrier 30, which will also generate an adsorption force with the magnet 40 to achieve the same technical effect.

[0063] In one embodiment, the housing 10 has a through-hole that connects the upper and lower parts, which can be directly used as a lens through-hole for avoiding the lens. Preferably, the housing 10 adopts a cylindrical structure with openings at both the upper and lower ends, or the housing 10 adopts a ring structure.

[0064] Reference Figure 7 and Figure 8 The invention employs a four-magnet structure with an arc shape, and the four magnets 40 are evenly arranged circumferentially along the inner wall of the through-hole in the outer shell. This invention, through the structural design of the four magnets 40 in conjunction with the coil, can significantly increase the driving force of the carrier 30 in the zoom direction.

[0065] Of course, in specific implementation, the magnet 40 can also be a ring structure set on the inner wall of the outer shell.

[0066] In one embodiment, reference is made to Figures 1 to 6 , Figure 8 The outer shell 10 has an outer shell through hole that is connected vertically. An upper sealing ring 11 is provided on the inner wall of the outer shell through hole. A magnet 40 is provided on the inner wall of the outer shell through hole. There is a receiving space 10a between the top of the magnet 40 and the upper sealing ring 11. The carrier 30 is confined in the outer shell through hole below the upper sealing ring 11.

[0067] In this embodiment, the upper sealing ring 11 and the top of the magnet 40 form a receiving space 10a, which serves as the movement space for the carrier 30 when it moves upward. Due to the setting of the upper sealing ring 11, the carrier 30 is confined within the outer shell through hole below the upper sealing ring 11. When confining, it is necessary to ensure that the inner diameter of the upper sealing ring 11 is smaller than the maximum outer diameter or horizontal length of the carrier 30 and the components mounted on it, so that the carrier 30 will not fall out of the upper sealing ring 11.

[0068] In specific implementation, it is preferable that the outer shell 10 and the upper sealing ring 11 are integrally formed.

[0069] In one embodiment, reference is made to Figures 6 to 8 There are four magnets 40, which adopt an arc-shaped structure. Four limiting protrusions 12 are provided circumferentially on the inner wall of the outer shell through hole. The four limiting protrusions 12 are located below the upper sealing ring 11. The four limiting protrusions 12 are arranged symmetrically in pairs, and a magnet 40 is installed between two adjacent limiting protrusions 12.

[0070] In specific implementation, it is preferable that four limiting protrusions 12 are evenly arranged circumferentially on the inner wall of the through hole of the outer shell.

[0071] In one embodiment, reference is made to Figures 8 to 10 The top edge of the carrier 30 is provided with an annular top protrusion 31, and the outer periphery of the top protrusion 31 is provided with a relief groove 311 for avoiding the limiting protrusion 12. The top protrusion 31 is located in the accommodating space 10a, and the distance between the top protrusion 31 and the upper sealing ring 11 is the range of movement of the carrier 30.

[0072] like Figure 9 and Figure 10 As shown, due to the design of the clearance groove 311, the annular top protrusion 31 is divided into four arc-shaped structures. In other words, it can also be considered that the top edge of the carrier 30 is provided with four arc-shaped top protrusions along the circumference, and there is a certain distance between two adjacent top protrusions to form a clearance groove.

[0073] In this embodiment, the top protrusion 31 is designed so that after the carrier 30 is installed, the top protrusion 31 is located in the receiving space 10a, and the zoom range of the carrier 30 is the vertical range of movement of the top protrusion 31 in the receiving space 10a.

[0074] In one embodiment, reference is made to Figures 6 to 8 Of the four limiting protrusions 12, two symmetrical limiting protrusions 12 serve as guide protrusions 13, and guide grooves 131 are provided on the sidewalls of the guide protrusions 13. That is to say, two symmetrical limiting protrusions 12 and two symmetrical guide protrusions 13 are provided circumferentially on the inner wall of the outer casing through hole. The two limiting protrusions 12 and the two guide protrusions 13 are spaced apart, and a magnet 40 is installed between adjacent limiting protrusions 12 and guide protrusions 13.

[0075] Reference Figure 5 , Figures 7 to 10 Two side protrusions 32 are provided on the outer side wall of the carrier 30. The two side protrusions 32 are symmetrically arranged. A ball bearing 60 is provided on the side protrusion 32. The side protrusion 32 is inserted into the guide groove 131, and the ball bearing 60 abuts against the groove wall of the guide groove 131.

[0076] In this embodiment, side protrusions 32 are symmetrically arranged on both side walls of the carrier 30. After installation, the side protrusions 32 are inserted into the guide groove 131. The side protrusions 32 are provided with grooves and ball bearings 60 are installed. The ball bearings 60 fit against the side wall of the guide groove 131. The ball bearings 60 achieve the auxiliary guiding effect of the carrier 30 during zoom operation.

[0077] In one embodiment, reference is made to Figure 10 The built-in metal parts also include a side magnetic plate 53, which is disposed on one side of the carrier 30. The side magnetic plate 53 has a magnet 40 on its outer side. The side magnetic plate 53 and the outer magnet 40 are arranged opposite each other and attract each other.

[0078] In this embodiment, a side magnetic plate 53 is provided on one side of the carrier, which generates an adsorption force with a magnet 40 on one side. This adsorption force keeps the ball 60 between the side protrusion 32 and the guide protrusion 13 in a contact state, thus preventing the ball 60 from coming out of the groove.

[0079] like Figure 10 As shown, in a specific implementation, the side magnetic plate 53 is preferably located between the upper magnetic ring 51 and the lower magnetic ring 52. The upper end of the side magnetic plate 53 is connected to the upper magnetic ring 51, and the lower end of the side magnetic plate 53 is connected to the lower magnetic ring 52. Preferably, the upper magnetic ring 51, the lower magnetic ring 52, and the side magnetic plate 53 are integrally formed into a built-in metal part.

[0080] In specific implementation, such as Figure 10 As shown, two side magnetic plates 53 can be provided side by side to increase the attraction force with the magnet 40 on one side.

[0081] In one embodiment, reference is made to Figure 5 and Figure 10 The base 20 is provided with a limiting groove 21 corresponding to the side protrusion 32, and the bottom end of the side protrusion 32 is inserted into the limiting groove 21.

[0082] In one embodiment, reference is made to Figure 5 , Figures 8 to 10 A coil 70 is wound around the outside of the carrier 30. The coil 70 and the magnet 40 are arranged opposite each other. After the coil 70 is energized, the carrier 30 moves up and down relative to the base 20 and the outer shell 10.

[0083] In this embodiment, the zoom operation of the carrier 30 and the lens installed therein is realized by the cooperation of the coil 70 and the magnet 40.

[0084] In practice, the coil 70 is preferably wound around the outer side of the middle part of the carrier 30 and corresponds to the four magnets 40.

[0085] When two side protrusions 32 are provided on the outer sidewall of the carrier 30, such as Figure 5 , Figure 8 and Figure 9 As shown, in order to facilitate the winding of the coil 70 around the outer side of the middle of the carrier 30, an avoidance opening can be provided in the middle of the side protrusion 32. The avoidance opening divides the side protrusion 32 into upper and lower parts. The side protrusion 32 in both the upper and lower parts is preferably provided with grooves and ball bearings 60 are installed.

[0086] In one embodiment, refer to 5, Figure 10 and Figure 11 The carrier 30 has a ring-shaped circuit board 80 at its bottom, preferably an FPC board. The circuit board 80 has an inner ring 81 (inner ring) and an outer ring 82 (outer ring), which are preferably integrally formed. The inner ring 81 connects to the outer ring 82 and is connected to the bottom of the carrier 30. The outer ring 82 is suspended or connected to the base 20. One end of the outer ring 82 has a wiring pin 83, which extends from the interface clearance groove 22 on the base 20 and is used for electrical connection to an external circuit. The coil 70 is connected to the circuit board 80 through the carrier's built-in wiring within the carrier 30, and the circuit board 80 supplies power to the coil 70.

[0087] In this embodiment, the carrier 30 is mainly supported by the circuit board 80. The circuit board 80 can supply power to the coil 70 on the outside of the carrier 30. The ring-shaped circuit board 80 has a certain elastic potential energy, which will play an auxiliary reset effect after the carrier 30 performs zoom movement.

[0088] In a specific implementation, the inner ring 81 is preferably a circular ring structure, with one end of the inner ring 81 extending outward to form a connecting part. The outer ring 82 is preferably an open ring structure, with one open end of the outer ring 82 connected to the connecting part, and the other open end of the outer ring 82 provided with a wiring pin 83.

[0089] In practical implementation, the base 20 is provided with a through hole that connects the upper and lower parts of the base. This through hole can be directly used as a lens through hole to avoid obstructing the lens. The outer ring 82 is suspended within this through hole.

[0090] Of course, in practical implementation, the circuit board can be replaced with a spring structure, with the spring supporting the carrier and supplying power to the coil. Alternatively, the circuit board can be replaced with other elastic support plates with a certain degree of flexibility, as long as they can support the carrier and supply power to the coil.

[0091] Example 2:

[0092] Reference Figure 12 This invention provides a lens driving device, which includes the zoom mechanism 100 provided in each embodiment of this invention.

[0093] In one embodiment, the lens driving device may further include an image stabilization mechanism 200, which is used to achieve image stabilization of the lens. The zoom mechanism 100 can be fixedly connected to the top of the image stabilization mechanism 200 via the base 20. The lens in the zoom mechanism 100 and the image sensor installed in the image stabilization mechanism 200 are arranged opposite to each other and there is no obstruction between them.

[0094] Of course, the lens driving device of the present invention, especially the image stabilization mechanism 200, can also be modified in other ways, and is not limited to these. Figure 12 The image stabilization mechanism 200 shown can be combined with any existing device that can cooperate with the zoom mechanism 100 of the present invention to achieve image stabilization and zoom functions to form a lens drive device.

[0095] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A zoom mechanism, characterized in that, The zoom mechanism includes a housing, a base, and a carrier. The housing and the base form a hollow cavity, and the carrier is located in the hollow cavity and can move up and down in the hollow cavity. The inner wall of the outer shell is provided with a magnet, and the carrier is provided with an internal metal component, the internal metal component including an upper magnetic ring and a lower magnetic ring, the upper magnetic ring being located above the lower magnetic ring; When the carrier is in its initial state, the upper magnetic ring is located on the inner side above the magnet, and the lower magnetic ring is located on the inner side below the magnet. When the carrier moves to the top, the lower magnetic ring attracts the bottom of the magnet, causing the carrier to be locked in a high position. When the carrier moves to the bottom, the upper magnetic ring attracts the top of the magnet, causing the carrier to be locked at a low position.

2. The zoom mechanism as described in claim 1, characterized in that, The built-in metal component is installed on the inner wall of the carrier, on the outer wall of the carrier, or embedded inside the carrier; And / or, the outer shell has a through hole that connects the upper and lower parts, and the magnet is four in number and has an arc-shaped structure, with the four magnets evenly arranged circumferentially along the inner wall of the through hole.

3. The zoom mechanism as described in claim 1, characterized in that, The outer shell has a through hole that connects the upper and lower parts. An upper sealing ring is provided on the inner wall of the through hole. The magnet is disposed on the inner wall of the through hole. There is a receiving space between the top of the magnet and the upper sealing ring. The carrier is confined within the through hole below the upper sealing ring.

4. The zoom mechanism as described in claim 3, characterized in that, The magnets consist of four pieces and are arranged in an arc shape; Four limiting protrusions are provided circumferentially on the inner wall of the through hole of the outer shell. The four limiting protrusions are located below the upper sealing ring. The four limiting protrusions are arranged symmetrically in pairs, and a magnet is installed between two adjacent limiting protrusions.

5. The zoom mechanism as described in claim 4, characterized in that, The top edge of the carrier is provided with an annular top protrusion, and the outer periphery of the top protrusion is provided with a relief groove for avoiding the limiting protrusion. The top protrusion is located within the receiving space, and the distance between the top protrusion and the upper sealing ring is the movement range of the carrier.

6. The zoom mechanism as described in claim 4, characterized in that, Of the four limiting protrusions, the two symmetrical limiting protrusions serve as guide protrusions, and guide grooves are provided on the sidewalls of the guide protrusions. Two side protrusions are provided on the outer sidewall of the carrier. The two side protrusions are symmetrically arranged. A ball is provided on the side protrusion. The side protrusion is inserted into the guide groove, and the ball abuts against the groove wall of the guide groove.

7. The zoom mechanism as described in claim 6, characterized in that, The built-in metal component also includes a side magnetic suction plate, which is disposed on one side of the carrier. The side magnetic suction plate has a magnet on its outer side. The side magnetic suction plate and the outer magnet are disposed opposite to each other and attract each other. Preferably, the side magnetic suction plate is located between the upper magnetic suction ring and the lower magnetic suction ring. The upper end of the side magnetic suction plate is connected to the upper magnetic suction ring, and the lower end of the side magnetic suction plate is connected to the lower magnetic suction ring. And / or, the base is provided with a limiting groove corresponding to the side protrusion, and the bottom end of the side protrusion is inserted into the limiting groove.

8. The zoom mechanism as described in any one of claims 1 to 7, characterized in that, A coil is wound around the outside of the carrier, and the coil is arranged opposite to the magnet. When the coil is energized, the carrier moves up and down relative to the base and the outer shell.

9. The zoom mechanism as described in claim 8, characterized in that, The carrier has an elastic support plate with an annular structure at its bottom end. The elastic support plate has an inner ring and an outer ring. The inner ring is connected to the outer ring and is connected to the bottom end of the carrier. The outer ring is suspended or connected to the base. One end of the outer ring is provided with a wiring pin. The wiring pin extends out of the base from the interface clearance groove on the base and is used for electrical connection with external circuits. The coil is connected to the elastic support plate through the built-in circuitry within the carrier, and the elastic support plate supplies power to the coil. Preferably, the elastic support plate is an FPC plate or a spring structure.

10. A lens driving device, characterized in that, The lens driving device includes the zoom mechanism as described in any one of claims 1 to 9.

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