Lens driving device

Abstract

The utility model belongs to optical image equipment technical field, concretely relates to a lens drive arrangement, include: base, frame, frame is set up and can move along first direction, second direction relative to base, and the top of frame is provided with AF direction inductive magnet, carrier, carrier is located in the frame and is set up and can move along third direction relative to frame, and carrier is provided with circuit board, and circuit board is provided with AF direction position sensor, and AF direction position sensor is located AF direction inductive magnet side, and the position monitoring of carrier along third direction movement is realized through the cooperation of AF direction position sensor and AF direction inductive magnet. The utility model sets up AF direction inductive magnet in the side of AF direction position sensor, can further reduce the overall height of device, and also realizes the position monitoring effect in AF direction through the cooperation of both.

Description

Technical Field

[0001] This utility model belongs to the field of optical imaging equipment technology, and specifically relates to a lens driving device. Background Technology

[0002] In recent years, with the development of technology, many electronic devices now 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 a more convenient and thinner design to provide users with more choices.

[0003] In practice, in order to adapt to various shooting scenarios, the lens needs to be constantly focused. In existing technologies, a lens drive device is generally used to drive the lens to move along the optical axis to adjust the focal length.

[0004] In the prior art, a lens driving device includes a frame, a carrier, and a base. The carrier is used to mount the lens, and the carrier is equipped with a coil and is movably mounted within the frame, capable of moving along the optical axis of the lens to adjust the lens focal length. The frame is movably mounted above the base and can move perpendicular to the optical axis to prevent lens shake.

[0005] However, to precisely control the movement of the carrier or frame, it is also necessary to sense the specific position of the carrier and frame in real time. In existing technologies, Hall effect sensors are generally used to sense the position of the carrier or frame; however, Hall effect sensors are relatively large, which affects the slim and lightweight design of the lens drive device. Therefore, how to achieve three-axis motion while simultaneously achieving a slim and lightweight design of the lens drive device is one of the issues that needs attention. Utility Model Content

[0006] The present invention addresses the aforementioned technical problems by providing a lens driving device.

[0007] A lens driving device, the lens driving device comprising:

[0008] Base;

[0009] A frame, the frame being configured to move relative to the base along a first direction and a second direction, the top of the frame being provided with an AF direction sensing magnet;

[0010] A carrier is located within the frame and is configured to move relative to the frame in a third direction. A circuit board is provided on the carrier, and an AF direction position sensor is provided on the circuit board. The AF direction position sensor is located on the side of the AF direction sensing magnet. The position monitoring of the carrier when it moves in a third direction is achieved through the cooperation of the AF direction position sensor and the AF direction sensing magnet.

[0011] Optionally, the lens driving device further includes a housing, which is detachably connected to the base and forms a hollow cavity, and the frame, the carrier, and the circuit board are all disposed within the hollow cavity.

[0012] Optionally, two AF direction sensing magnets are arranged side by side at the top of the frame along a first direction or a second direction, and a monitoring clearance groove is provided between the two AF direction sensing magnets. The magnetic poles of the two AF direction sensing magnets facing the monitoring clearance groove are the same.

[0013] The carrier is provided with a protruding structure, and the AF direction position sensor is provided on the protruding structure. The protruding structure extends into the monitoring clearance groove. When the carrier moves relative to the frame in a third direction, the AF direction position sensor moves in a third direction between two AF direction sensing magnets and monitors the position change of the carrier in the third direction with the cooperation of the two AF direction sensing magnets.

[0014] Optionally, the AF direction position sensor is disposed at the bottom of the circuit board.

[0015] Optionally, the top of the frame is provided with a magnet mounting groove, and the two AF direction magnets are installed in the magnet mounting groove.

[0016] Optionally, the top of the protruding structure is provided with an AF sensor mounting slot, and the AF direction position sensor is installed in the AF sensor mounting slot.

[0017] Optionally, an AF direction sensing magnet is provided at the top of the frame, and the length direction of the AF direction sensing magnet is parallel to the length direction of the AF direction position sensor.

[0018] Optionally, a carrier guide shaft mounting groove is provided at a diagonal position on the outer side of the carrier, and a frame guide shaft mounting groove is provided at a diagonal position on the inner wall of the frame. The carrier guide shaft mounting groove and the frame guide shaft mounting groove are arranged opposite each other to form a guide mounting groove, and a guide shaft is installed in the guide mounting groove.

[0019] Optionally, an AF coil is provided on the outside of the carrier, and a plurality of driving magnets are provided on the frame. Each driving magnet is arranged opposite to a corresponding AF coil, and after the AF coil is energized, the carrier can move relative to the frame in a third direction.

[0020] There are at least two AF coils, which are arranged opposite each other on the outer side of the carrier. Each of the two oppositely arranged AF coils has a carrier-embedded adsorption metal sheet on the inner side wall of the carrier. The two carrier-embedded adsorption metal sheets are arranged diagonally opposite each other, and the carrier-embedded adsorption metal sheets are attracted to each other with the driving magnet on their outer side.

[0021] Optionally, the lens driving device further includes:

[0022] A plurality of upper springs are connected between the top of the frame and the top of the carrier, wherein two upper springs are respectively connected to the AF coil and the circuit board via a carrier-embedded circuit within the carrier;

[0023] The base has support parts at its four corners. The top of each support part is connected to one or more upper springs. The frame and the carrier are suspended on the base by the support parts. The current provided by the base's built-in circuit is transmitted to the AF coil, the circuit board, and the AF direction position sensor on the circuit board by two independent upper springs through two support parts.

[0024] Optionally, the support portion adopts a support protrusion, and the support protrusion is provided with an electrical contact point connected to the built-in circuit of the base. The built-in circuit of the base is connected to the upper spring through the electrical contact point.

[0025] Optionally, the support portion is an energized rod that extends in a third direction and whose bottom end is connected to the built-in circuit of the base. The built-in circuit of the base is connected to the upper spring through the energized rod.

[0026] Optionally, the base is provided with a plurality of OIS coils, and the frame is provided with a plurality of driving magnets. Each driving magnet is arranged opposite to a corresponding OIS coil, and after the OIS coil is energized, the frame can move relative to the base in a first direction or a second direction.

[0027] Optionally, the OIS coil is powered by a base-integrated circuit within the base.

[0028] Optionally, at least one of the OIS coils consists of two separate OIS coils arranged side by side. An OIS orientation position sensor is provided in the middle or bottom of the separate OIS coil. The position monitoring and rotation monitoring of the frame when it moves along the first direction and the second direction are realized through the cooperation of the OIS orientation position sensor and the corresponding driving magnet.

[0029] Optionally, the OIS orientation position sensor is powered by a base-embedded circuit within the base.

[0030] Optionally, a ball bearing structure is provided between the base and the frame.

[0031] Optionally, a ball groove is provided at each of the four corners of the base, a pre-embedded support metal plate is provided at the bottom of the ball groove, a ball is provided in the ball groove, and the ball contacts the four corners of the bottom end of the frame.

[0032] Optionally, of the four balls, three of the balls have an outer diameter greater than that of one ball.

[0033] Optionally, the three balls with the larger outer diameter among the four balls are the first balls. The OIS coil is provided on the base between two adjacent first balls. The bottom of the OIS coil between two adjacent first balls is provided with a base-embedded adsorption metal. The base-embedded adsorption metal is disposed in the base and is attracted to the corresponding driving magnet.

[0034] Optionally, the ball with the smaller outer diameter among the four balls is the second ball. When the OIS coil is provided on the base between the first ball and the adjacent second ball, one or more auxiliary metal plates are provided at the bottom of the OIS coil between the first ball and the adjacent second ball. The auxiliary metal plates are disposed in the base and are attracted to each other with the corresponding driving magnet.

[0035] Optionally, the base has one or more hollow holes on its built-in adsorption metal, making the built-in adsorption metal a hollow structure. An OIS sensor mounting slot is provided in the hollow hole. The OIS sensor mounting slot is located on the bottom end face or top end face of the base. An OIS orientation position sensor is installed in the OIS sensor mounting slot. The position monitoring of the frame when it moves along the first direction and the second direction is realized by the cooperation of the OIS orientation position sensor and the corresponding driving magnet.

[0036] Beneficial effects: This utility model has at least one or more of the following advantages:

[0037] 1. In this utility model, the AF direction position sensor is set on the circuit board on the carrier, and the AF direction sensing magnet that cooperates with the AF direction position sensor is set on the frame. The AF direction sensing magnet is set on the side of the AF direction position sensor, such as the sides or the front side. Compared with the method of setting the sensing magnet below the position sensor, the overall height of the device can be further reduced. At the same time, the position monitoring effect in the AF direction is achieved through the cooperation of the two.

[0038] This invention employs a structure where a protruding structure on the carrier extends into a monitoring clearance groove on the frame. This allows the AF direction position sensor to move between two AF direction sensing magnets when the carrier moves relative to the frame in the AF direction. With the cooperation of the AF direction sensing magnets, the sensor detects the change in the AF direction position of the carrier. By using two AF direction sensing magnets arranged side by side in conjunction with the AF direction position sensor, the overall height of the device is reduced while the magnetic field strength of the sensing magnets is increased, resulting in better monitoring performance.

[0039] 2. This utility model provides an auxiliary guiding effect by setting two diagonally arranged guide shafts between the frame and the carrier, which can be used to guide the carrier when it moves in the AF direction.

[0040] To ensure a tight fit between the inner wall of the carrier guide shaft mounting groove and the outer wall of the guide shaft, two embedded metal plates are pre-embedded in the side wall of the carrier. These two embedded metal plates are positioned at opposite angles and are located inside the AF coil. The embedded metal plates can generate an attractive force with the driving magnet. Under the magnetic attraction of the two embedded metal plates, the carrier generates a rotational force. This rotational force ensures a tight fit between the inner wall of the carrier guide shaft mounting groove and the outer wall of the guide shaft, thus guaranteeing the guiding effect of the guide shaft.

[0041] 3. This utility model features an upper spring plate connected between the top of the frame and the top of the carrier for the carrier's reset operation. The frame and carrier are fully supported by the support portion on the base in conjunction with the upper spring plate. Simultaneously, after the frame moves in the first and second directions, the elasticity of the upper spring plate provides a certain degree of reset. During the driving operation, the current from the base's built-in circuit is transmitted to the upper spring plate via the support portion. The upper spring plate then transmits the current to the AF coil and circuit board on the outer periphery of the carrier, providing power to these components, thereby powering the AF coil, circuit board, and AF direction position sensor.

[0042] 4. During normal use, when the frame and carrier move in the first and second directions under the combined action of the OIS coil and the driving magnet, the frame and carrier will experience slight rotation around the optical axis (Z-axis), affecting the motor's motion accuracy. This invention designs at least one OIS coil on the base as two separate OIS coils arranged side-by-side. Corresponding OIS direction position sensors are located in the middle or bottom of the two separate OIS coils. When individual first or second direction driving is required, the two separate OIS coils are supplied with current in the same direction. When the two OIS direction position sensors detect rotation of the frame during first or second direction movement, the two separate OIS coils are supplied with current in different directions. This, in conjunction with the driving magnet, generates a force opposite to the frame's rotation direction, effectively preventing rotation.

[0043] 5. This utility model incorporates a ball bearing structure between the base and the frame to reduce friction during OIS driving. Specifically, ball bearings at the four corners of the base provide support for the frame. Since three ball bearings are sufficient for frame support, they would constantly replace each other when the lens drive device shakes or the frame moves in the first or second direction, resulting in unstable support. This utility model employs a combination of three large ball bearings and one small ball bearing to support the frame. The small ball bearing is slightly smaller than the large ball bearings. During operation, the three large ball bearings provide primary support, while the small ball bearing provides secondary support. When the frame experiences a significant shift in the direction of the small ball bearing, it provides temporary support. This design avoids the constant replacement of the three main supporting ball bearings during lens drive device operation, thereby improving the frame's stability.

[0044] 6. In order to ensure that the bottom of the frame fits tightly against the three large ball bearings, a base with built-in adsorption metal is set at the bottom of the OIS coil between the three large ball bearings. Through the adsorption force between the built-in adsorption metal and the driving magnet, a stable support structure is formed between the frame, the three large ball bearings, and the base.

[0045] When an OIS coil is also installed between the small and large ball bearings, one or more small auxiliary metal plates are placed side-by-side in the base at the bottom of the OIS coil. These auxiliary metal plates only need to overcome the Z-axis offset force generated when the OIS coil performs its first or second directional driving action. In other words, during normal first or second directional driving actions, the frame inevitably generates a certain Z-axis force, which can be overcome by the magnetic attraction between the auxiliary metal plates in the base and the driving magnet.

[0046] 7. This utility model installs the OIS directional position sensor in the hollow hole of the built-in adsorption metal in the base. The OIS directional position sensor cooperates with the corresponding driving magnet to realize the position monitoring of the frame in the OIS direction, that is, the first direction and the second direction. This design does not affect the adsorption effect of the built-in adsorption metal in the base, and can reduce the overall thickness of the base, thereby further reducing the overall height of the device. It reduces the height space occupied by the device and facilitates installation and application. Attached Figure Description

[0047] Figure 1 This is an exploded view of the structure of this utility model;

[0048] Figure 2 for Figure 1 Further exploded view;

[0049] Figure 3 for Figure 2 Further exploded view;

[0050] Figure 4 This is an exploded view showing the positional relationship between the frame and the carrier of this utility model;

[0051] Figure 5 for Figure 4 Further exploded view;

[0052] Figure 6 for Figure 5 Exploded view of part of the structure;

[0053] Figure 7 This is a schematic diagram of one structure of the base of this utility model;

[0054] Figure 8 for Figure 7 A partial internal structure diagram;

[0055] Figure 9 This diagram shows the positional relationship between the built-in adsorption metal in the base of this utility model and the OIS directional position sensor. Detailed Implementation

[0056] 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.

[0057] 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 can 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.

[0058] 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.

[0059] In the following description, in order to clearly demonstrate the structure and working method of this utility model, 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.

[0060] In the following description, the first direction is defined as the X-axis, the second direction as the Y-axis, and the third direction as the Z-axis, which is the optical axis. The optical axis represents the direction of light propagation within an optical element; it is an abstract concept and does not refer to a physical axis.

[0061] Reference Figures 1 to 9 This utility model provides a lens driving device, which mainly includes a housing 10, a base 20, a frame 30, a carrier 40, and a circuit board 50.

[0062] The outer shell 10 is an optional structure. The outer shell 10 and the base 20 are detachably connected and form a hollow cavity. The frame 30, the carrier 40, and the circuit board 50 are all housed within the hollow cavity. Preferably, the outer shell 10 and the base 20 are connected by a snap-fit ​​mechanism to form the hollow cavity.

[0063] The frame 30 is configured to move relative to the base 20 along the X-axis and Y-axis directions. The X-axis and Y-axis directions are perpendicular to each other. In one specific implementation example, refer to... Figures 2 to 7The base 20 is equipped with several OIS coils 61, and the bottom of the frame 30 is equipped with several magnet mounting slots. Drive magnets 62 are installed in the magnet mounting slots. Each drive magnet 62 is positioned opposite to a corresponding OIS coil 61. After the OIS coil 61 is energized, the frame 30, along with the carrier 40 mounted on it, can move relative to the base 20 along the X-axis and Y-axis directions within the hollow cavity, achieving anti-shake purposes. Since the OIS coils 61 are fixedly wound on the base 20, the base 20 has an internal circuitry to power the OIS coils 61.

[0064] The carrier 40 is located within the frame 30 and is configured to move relative to the frame 30 along the Z-axis. The Z-axis is perpendicular to both the X-axis and Y-axis. In one specific implementation example, refer to... Figures 3 to 6 An AF coil 63 is provided on the outside of the carrier 40, and several magnet mounting slots are provided at the bottom of the frame 30. The driving magnet 62 is installed in the magnet mounting slot. Each driving magnet 62 is positioned opposite to a corresponding AF coil 63. After the AF coil 63 is energized, the carrier 40 can move relative to the frame 30 along the Z-axis to achieve zoom.

[0065] The lens is installed inside the carrier 40. When the carrier 40 moves, it can drive the lens to move along its optical axis, that is, the Z-axis. When the frame 30 moves, it can drive the carrier 40 and the lens on it to move along the X-axis and Y-axis, thus realizing the three-axis movement operation of the lens.

[0066] An AF direction sensing magnet 64 is disposed at the top of the frame 30. A circuit board 50 is disposed on the carrier 40, and an AF direction position sensor 65 is disposed on the circuit board 50. The AF direction position sensor 65 is located to the side of the AF direction sensing magnet 64. The position monitoring of the carrier 40 when it moves along the Z-axis is achieved through the cooperation of the AF direction position sensor 65 and the AF direction sensing magnet 64. Compared with the prior art where the sensing magnet is placed below the position sensor, this utility model can further reduce the overall height of the device while still achieving the position monitoring effect in the AF direction through the cooperation of the AF direction position sensor 65 and the AF direction sensing magnet 64.

[0067] In one embodiment, reference is made to Figures 4 to 6 Two AF direction sensing magnets 64 are arranged side by side at the top of the frame 30 along the X-axis or Y-axis. A monitoring clearance slot 31 is reserved between the two AF direction sensing magnets 64, and the magnetic poles of the two AF direction sensing magnets 64 facing the monitoring clearance slot 31 are the same. That is, the same magnetic poles of the two AF direction sensing magnets 64 are arranged opposite each other. For example, the S poles of the two AF direction sensing magnets 64 both face the monitoring clearance slot 31.

[0068] The carrier 40 is provided with a protruding structure 41, and an AF direction position sensor 65 is provided on the protruding structure 41. The protruding structure 41 extends into the monitoring clearance groove 31. When the carrier 40 moves relative to the frame 30 along the Z-axis, the AF direction position sensor 65 moves in the Z-axis direction between two AF direction sensing magnets 64 and monitors the position change of the carrier 40 when it moves along the Z-axis with the cooperation of the two AF direction sensing magnets 64.

[0069] In this embodiment, a protruding structure 41 on the carrier 40 extends into a monitoring clearance groove 31 on the frame 30. This allows the carrier 40 to move relative to the frame 30 in the Z-axis direction. Two AF direction sensing magnets 64 arranged side by side work together with the AF direction position sensor 65 to reduce the overall height of the device while increasing the magnetic field strength of the sensing magnets and improving the monitoring effect.

[0070] Of course, in actual implementation, the position monitoring effect can also be achieved by setting only an AF direction sensing magnet 64 on the front side of the AF direction position sensor 65. It is necessary to make the length direction of the AF direction sensing magnet 64 parallel to the length direction of the AF direction position sensor 65 in order to achieve the monitoring effect.

[0071] In one embodiment, the AF direction position sensor 65 is disposed at the bottom of the circuit board 50.

[0072] In one embodiment, reference is made to Figure 5 The top of the frame 30 is provided with a sensing magnet mounting groove 32, and two AF direction sensing magnets 64 are installed side by side in the sensing magnet mounting groove 32 with a monitoring clearance groove 31 reserved between them.

[0073] In one embodiment, reference is made to Figure 5 The top of the protruding structure 41 is provided with an AF sensor mounting slot 411, and the AF direction position sensor 65 is installed in the AF sensor mounting slot 411.

[0074] In one embodiment, reference is made to Figures 2 to 6 Carrier guide shaft mounting grooves 43 are provided at diagonal positions on the outer side of the carrier 40, and frame guide shaft mounting grooves 33 are provided at diagonal positions on the inner wall of the frame 30. The carrier guide shaft mounting grooves 43 and the frame guide shaft mounting grooves 33 are arranged opposite each other to form guide mounting grooves. A guide shaft 70 is installed in the guide mounting groove, which can play an auxiliary guiding role when the carrier 40 moves in the AF direction.

[0075] That is, the carrier 40 has at least two oppositely arranged corners for providing carrier guide shaft mounting grooves 43 at diagonally opposite positions. Similarly, the frame 30 has at least two oppositely arranged corners for providing frame guide shaft mounting grooves 33 at diagonally opposite positions. Preferably, both the frame 30 and the carrier 40 are rectangular frame structures.

[0076] In one embodiment, reference is made to Figures 3 to 6 To ensure a tight fit between the inner wall of the carrier guide shaft mounting groove 43 on the carrier 40 and the outer wall of the guide shaft 70, two carrier-embedded adsorption metal plates 42 are pre-embedded in the side wall of the carrier 40. Specifically, at least two AF coils 63 are used, positioned opposite each other on the outer side of the carrier 40. Each of the two opposing AF coils has a carrier-embedded adsorption metal plate 42 on its inner side wall of the carrier 40. The two carrier-embedded adsorption metal plates 42 are diagonally arranged, and they attract each other to the driving magnet 62 on their outer sides. The carrier-embedded adsorption metal plates 42 generate an adsorption force with the driving magnet 62. Under the magnetic attraction of the two carrier-embedded adsorption metal plates 42, the carrier 40 generates a rotational force. This rotational force ensures a tight fit between the inner wall of the carrier guide shaft mounting groove 43 on the carrier 40 and the outer wall of the guide shaft 70, thus guaranteeing the guiding effect of the guide shaft 70.

[0077] In one embodiment, reference is made to Figures 1 to 3 The lens driving device also includes several upper springs 80. The AF coil 63, circuit board 50, and AF direction position sensor 65 on circuit board 50 are energized through the upper springs 80. Specifically:

[0078] Several upper springs 80 are respectively connected between the top of the frame 30 and the top of the carrier 40, and two upper springs 80 are respectively connected to the AF coil 63 and the circuit board 50 through the carrier built-in circuit in the carrier 40.

[0079] The base 20 has support parts at its four corners. The top of each support part is connected to one or more upper spring plates 80. The frame 30 and the carrier 40 are suspended on the base 20 through the support parts. The current provided by the base built-in circuit in the base 20 is transmitted to the AF coil 63, the circuit board 50 and the AF direction position sensor 65 on the circuit board 50 through two independent upper spring plates 80 via two support parts.

[0080] In one embodiment, reference is made to Figure 2 , Figure 3 and Figure 7 The support part adopts a support protrusion 21, and the support protrusion 21 is provided with an electrical contact point that is connected to the built-in circuit of the base. The built-in circuit of the base is connected to the spring 80 through the electrical contact point.

[0081] In this embodiment, the support protrusions 21 at the four corners of the base 20 support and power the upper spring 80, the frame 30, and the carrier 40.

[0082] In one embodiment, the support part adopts an electric rod that extends along the Z-axis and whose bottom end is connected to the built-in circuit of the base. The built-in circuit of the base is connected to the upper spring 80 through the electric rod.

[0083] In one embodiment, reference is made to Figure 2 , Figure 3 , Figure 7 and Figure 8 At least one OIS coil 61 is provided on the base 20 along the X-axis and Y-axis directions respectively. Therefore, the OIS coil 61 is divided into an OIS coil 61 driven in the X-axis direction and an OIS coil 61 driven in the Y-axis direction.

[0084] In the prior art, the OIS coils on each side of the base 20 are integral structures. However, during normal use, when the frame 30 and the carrier 40 move in the X-axis and Y-axis directions under the combined action of the OIS coils and the drive magnet, the frame 30 and the carrier 40 will rotate slightly around the optical axis (Z-axis), affecting the accuracy of the motor movement.

[0085] Therefore, in this embodiment, at least one OIS coil 61 is composed of two separate OIS coils 61a arranged side by side. Corresponding OIS direction position sensors 66 are respectively provided in the middle or bottom of the two separate OIS coils 61a. When individual X-axis or Y-axis driving is required, the two separate OIS coils 61a are supplied with current in the same direction. The position and rotation of the frame 30 are monitored when it moves along the X-axis and Y-axis through the cooperation of the two OIS direction position sensors 66 and the corresponding driving magnets 62. When the two OIS direction position sensors 66 detect rotation of the frame 30 during X-axis or Y-axis movement, currents in different directions are supplied to the two separate OIS coils 61a. These currents, in conjunction with the driving magnets 62, generate a force opposite to the rotation direction of the frame 30, thus preventing rotation.

[0086] like Figure 7 In the embodiment shown, only the OIS coil 61 on one side of the base 20 is designed as a split structure. However, the OIS coils 61 on both sides or three sides of the base 20 can also be designed as split structures. However, at least one side of the OIS coil 61 needs to be designed as a split structure to achieve the correction effect.

[0087] In one embodiment, the OIS orientation position sensor 66 is powered by a base-integrated circuit within the base 20.

[0088] In one embodiment, a ball bearing structure is provided between the base 20 and the frame 30 to reduce friction during OIS driving.

[0089] In one embodiment, reference is made to Figure 7 and Figure 8 Each of the four corners of the base 20 is provided with a ball groove, and a pre-embedded support metal plate 23 is provided at the bottom of the ball groove. A ball 90 is provided in the ball groove, and the ball 90 contacts the four corners of the bottom of the frame 30.

[0090] In other words, both the base 20 and the frame 30 have at least four corners. Preferably, the base 20 is a rectangular structure and the frame 30 is a rectangular frame structure. Of course, lens clearance holes along the Z-axis are provided on the outer shell 10, the base 20, the frame 30, and the carrier 40.

[0091] In this embodiment, four ball bearings are arranged on the base 20 and contact the bottom of the frame to support the frame 30.

[0092] In one embodiment, reference is made to Figure 7 and Figure 8 Of the four ball bearings 90, the outer diameter of three of them is larger than that of the outer diameter of the first ball bearing 90.

[0093] like Figure 8 As shown, three balls 90 with larger outer diameters are defined as the first ball 90a, and one ball 90 with smaller outer diameters is defined as the second ball 90b.

[0094] In existing technologies, the ball bearings between the base 20 and the frame 30 typically use a structure of the same size. Since three ball bearings are sufficient to support the frame 30, when the lens drive device shakes or the frame 30 moves along the X-axis or Y-axis, the three ball bearings providing primary support will continuously replace each other, resulting in an unstable support effect from the four ball bearings. In this embodiment, a structure using three first ball bearings 90a and one second ball bearing 90b is employed to support the frame 30. The second ball bearing 90b is slightly smaller than the first ball bearings 90a. During use, the three first ball bearings 90a provide primary support for the frame 30, while the second ball bearing 90b provides secondary support. When the frame 30 experiences a significant shift in the direction of the second ball bearing 90b, the second ball bearing 90b provides temporary support. This design avoids the continuous replacement of the three main supporting ball bearings 90 during the use of the lens drive device, thereby improving the movement stability of the frame 30.

[0095] In one embodiment, reference is made to Figure 8Of the four balls 90, the three balls 90 with the larger outer diameter are the first balls 90a. An OIS coil 61 is provided on the base 20 between two adjacent first balls 90a. A base-embedded adsorption metal 24 is provided at the bottom of the OIS coil 61 between two adjacent first balls 90a. The base-embedded adsorption metal 24 is located inside the base 20. The base-embedded adsorption metal 24 and the corresponding driving magnet 62 are mutually attracted.

[0096] In order to ensure that the bottom of the frame 30 is tightly abutted against the three first balls 90a, this embodiment provides a base with a built-in adsorption metal 24 at the bottom of the OIS coil 61 between each pair of the three first balls 90a. Through the adsorption force between the built-in adsorption metal 24 and the driving magnet 62, a stable support structure is formed between the frame 30, the three first balls 90a, and the base 20.

[0097] In one embodiment, reference is made to Figure 8 Among the four balls 90, the ball 90 with the smaller outer diameter is the second ball 90b. When an OIS coil 61 is provided on the base 20 between the first ball 90a and the adjacent second ball 90b, one or more base-embedded auxiliary metal plates 25 are provided at the bottom of the OIS coil 61 between the first ball 90a and the adjacent second ball 90b. The base-embedded auxiliary metal plates 25 are located inside the base 20, and the base-embedded auxiliary metal plates 25 and the corresponding driving magnets 62 are attracted to each other.

[0098] When there are several auxiliary metal pieces 25 built into the base, their side-by-side direction is determined by their setting position. For example, when the auxiliary metal pieces 25 built into the base are set at the bottom of the OIS coil along the X-axis, several auxiliary metal pieces 25 built into the base are set side-by-side along the X-axis.

[0099] like Figure 8 As shown, OIS coils are arranged on two opposite sides of the base 20 along the X-axis and one OIS coil along the Y-axis to achieve OIS-direction drive. Therefore, a larger base-embedded auxiliary metal plate 25 is positioned below one of the X-axis and one of the Y-axis OIS coils to ensure the frame 20 fits tightly against the three first ball bearings 90a. A smaller base-embedded auxiliary metal plate 25 is positioned below the other X-axis OIS coil. The base-embedded auxiliary metal plate 25 only needs to overcome the Z-axis offset force generated when the OIS coil 61 performs X-axis or Y-axis drive actions. In other words, during normal X-axis and Y-axis drive actions, the frame 30 inevitably generates a certain Z-axis force, which can be overcome by the magnetic attraction between the base-embedded auxiliary metal plate 25 and the drive magnet 62.

[0100] Of course, when the OIS coil 61 is not provided on the base 20 between the first ball 90a and the adjacent second ball 90b, that is, when the base 20 has only one OIS coil in the X-axis direction and one OIS coil in the Y-axis direction for OIS direction driving, there is no need to pre-embed the base built-in auxiliary metal plate 25.

[0101] In one embodiment, reference is made to Figure 8 and Figure 9 The base has one or more hollow holes 241 on the built-in adsorption metal 24, making the built-in adsorption metal 24 a hollow structure. The hollow hole 241 is provided with an OIS sensor mounting slot. The OIS sensor mounting slot is set on the bottom end face or top end face of the base 20. An OIS direction position sensor 66 is installed in the OIS sensor mounting slot. The position monitoring of the frame 30 when it moves along the X-axis and Y-axis is realized by the cooperation of the OIS direction position sensor 66 and the corresponding driving magnet 62.

[0102] In this embodiment, the OIS orientation position sensor 66 is installed in the hollow hole 241 of the built-in adsorption metal 24 in the base. The OIS orientation position sensor 66 and the corresponding driving magnet 62 cooperate to realize the position monitoring of the frame 30 in the OIS direction, that is, the X-axis direction and the Y-axis direction. This design does not affect the adsorption effect of the built-in adsorption metal 24 in the base, and can reduce the overall thickness of the base 20, thereby further reducing the overall height of the device. It reduces the height space occupied by the device and facilitates installation and application.

[0103] In this embodiment, the specific location of the perforated hole 241 is not limited. The perforated hole 241 can be located at the center of the built-in adsorption metal 24 in the base, or it can be located on one or both sides of the built-in adsorption metal 24 in the base.

[0104] like Figures 7 to 9 As shown, since the OIS coil in the Y-axis direction adopts two split OIS coils 61a, and each split OIS coil 61a is provided with an OIS direction position sensor 66, there are two OIS direction position sensors 66 in the hollow hole 241 of the base built into the bottom of the two split OIS coils 61a to attract metal 24.

[0105] The preferred embodiments of this utility model 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 this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A lens driving device, characterized in that, The lens driving device includes: Base; A frame, the frame being configured to move relative to the base along a first direction and a second direction, the top of the frame being provided with an AF direction sensing magnet; A carrier is located within the frame and is configured to move relative to the frame in a third direction. A circuit board is provided on the carrier, and an AF direction position sensor is provided on the circuit board. The AF direction position sensor is located on the side of the AF direction sensing magnet. The position monitoring of the carrier when it moves in a third direction is achieved through the cooperation of the AF direction position sensor and the AF direction sensing magnet.

2. The lens driving device as described in claim 1, characterized in that, Two AF direction sensing magnets are arranged side by side at the top of the frame along a first or second direction. There is a monitoring clearance groove between the two AF direction sensing magnets. The magnetic poles of the two AF direction sensing magnets facing the monitoring clearance groove are the same. The carrier is provided with a protruding structure, and the AF direction position sensor is provided on the protruding structure. The protruding structure extends into the monitoring clearance groove. When the carrier moves relative to the frame in a third direction, the AF direction position sensor moves in a third direction between two AF direction sensing magnets and monitors the position change of the carrier in the third direction with the cooperation of the two AF direction sensing magnets.

3. The lens driving device as described in claim 2, characterized in that, The AF direction position sensor is located at the bottom of the circuit board.

4. The lens driving device as described in claim 2, characterized in that, The top of the frame is provided with a magnet mounting slot, and the two AF direction magnets are installed in the magnet mounting slot.

5. The lens driving device as described in claim 2, characterized in that, The top of the protruding structure is provided with an AF sensor mounting slot, and the AF direction position sensor is installed in the AF sensor mounting slot.

6. The lens driving device as claimed in claim 1, characterized in that, The lens driving device also includes a housing, which is detachably connected to the base and forms a hollow cavity. The frame, the carrier, and the circuit board are all disposed within the hollow cavity.

7. The lens driving device as claimed in claim 1, characterized in that, An AF direction sensing magnet is provided at the top of the frame, and the length direction of the AF direction sensing magnet is parallel to the length direction of the AF direction position sensor.

8. The lens driving device as claimed in claim 1, characterized in that, Carrier guide shaft mounting grooves are provided at diagonal positions on the outer side of the carrier, and frame guide shaft mounting grooves are provided at diagonal positions on the inner wall of the frame. The carrier guide shaft mounting grooves and the frame guide shaft mounting grooves are arranged opposite each other to form guide mounting grooves, and guide shafts are installed in the guide mounting grooves.

9. The lens driving device as described in claim 8, characterized in that, An AF coil is provided on the outside of the carrier, and a number of driving magnets are provided on the frame. Each driving magnet is positioned opposite to a corresponding AF coil, and after the AF coil is energized, the carrier can move relative to the frame in a third direction. There are at least two AF coils, which are arranged opposite each other on the outer side of the carrier. Each of the two oppositely arranged AF coils has a carrier-embedded adsorption metal sheet on the inner side wall of the carrier. The two carrier-embedded adsorption metal sheets are arranged diagonally opposite each other, and the carrier-embedded adsorption metal sheets are attracted to each other with the driving magnet on their outer side.

10. The lens driving device as claimed in claim 9, characterized in that, The lens driving device also includes: A plurality of upper springs are connected between the top of the frame and the top of the carrier, wherein two upper springs are respectively connected to the AF coil and the circuit board via a carrier-embedded circuit within the carrier; The base has support parts at its four corners. The top of each support part is connected to one or more upper springs. The frame and the carrier are suspended on the base by the support parts. The current provided by the base's built-in circuit is transmitted to the AF coil, the circuit board, and the AF direction position sensor on the circuit board by two independent upper springs through two support parts.

11. The lens driving device as claimed in claim 10, characterized in that, The support portion adopts a support protrusion, and the support protrusion is provided with an electrical contact point that is connected to the built-in circuit of the base. The built-in circuit of the base is connected to the upper spring through the electrical contact point.

12. The lens driving device as claimed in claim 10, characterized in that, The support part adopts an electric rod, which extends in a third direction and its bottom end is connected to the built-in circuit of the base. The built-in circuit of the base is connected to the upper spring through the electric rod.

13. The lens driving device as claimed in claim 1, characterized in that, The base is provided with a plurality of OIS coils, and the frame is provided with a plurality of driving magnets. Each driving magnet is arranged opposite to a corresponding OIS coil, and after the OIS coil is energized, the frame can move relative to the base in a first direction or a second direction.

14. The lens driving device as claimed in claim 13, characterized in that, The OIS coil is powered by the base's built-in circuitry within the base.

15. The lens driving device as claimed in claim 13, characterized in that, At least one of the OIS coils consists of two separate OIS coils arranged side by side. An OIS orientation position sensor is provided in the middle or bottom of the separate OIS coil. The position monitoring and rotation monitoring of the frame when it moves along the first direction and the second direction are realized through the cooperation of the OIS orientation position sensor and the corresponding driving magnet.

16. The lens driving device as claimed in claim 15, characterized in that, The OIS orientation position sensor is powered by the built-in circuitry within the base.

17. The lens driving device as claimed in claim 13, characterized in that, A ball bearing structure is provided between the base and the frame.

18. The lens driving device as claimed in claim 17, characterized in that, Each of the four corners of the base is provided with a ball groove, the bottom of the ball groove is provided with a pre-embedded support metal plate, the ball is provided in the ball groove, and the ball is in contact with the four corners of the bottom of the frame.

19. The lens driving device as claimed in claim 18, characterized in that, Of the four balls, three of the balls have an outer diameter greater than that of one ball.

20. The lens driving device as claimed in claim 19, characterized in that, The three balls with the larger outer diameter among the four balls are the first balls. The OIS coil is provided on the base between two adjacent first balls. The bottom of the OIS coil between two adjacent first balls is provided with a base-embedded adsorption metal. The base-embedded adsorption metal is disposed in the base and is attracted to the corresponding driving magnet.

21. The lens driving device as claimed in claim 20, characterized in that, The ball with the smaller outer diameter among the four balls is the second ball. When the OIS coil is provided on the base between the first ball and the adjacent second ball, one or more auxiliary metal plates are provided at the bottom of the OIS coil between the first ball and the adjacent second ball. The auxiliary metal plates are disposed in the base and are attracted to each other with the corresponding driving magnet.

22. The lens driving device as claimed in claim 20, characterized in that, The base has one or more hollow holes on its built-in adsorption metal, making the built-in adsorption metal a hollow structure. An OIS sensor mounting slot is provided in the hollow hole. The OIS sensor mounting slot is located on the bottom end face or the top end face of the base. An OIS direction position sensor is installed in the OIS sensor mounting slot. The position monitoring of the frame when it moves along the first direction and the second direction is realized by the cooperation of the OIS direction position sensor and the corresponding driving magnet.

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