Lens driving device

Abstract

The invention belongs to the technical field of optical imaging equipment, and particularly relates to a lens driving device, which comprises a base and a motor mechanism, and the motor mechanism is positioned on the base and can move along a third direction relative to the base; the motor mechanism comprises a frame and a carrier, the frame is located on the base and arranged to be capable of moving relative to the base in the third direction, and the carrier is located in the frame and arranged to be capable of moving relative to the frame in the first direction and the second direction. The integrated motor mechanism is adopted to achieve the anti-shake function of the lens, the motor mechanism and the base move along the optical axis to achieve the zoom function of the lens, and the whole device is high in integration degree.

Description

Lens drive device Technical Field

[0001] This invention 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 and stabilized. 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, and to drive the lens to move in a direction perpendicular to the optical axis to prevent lens shake.

[0004] Currently, common lens drive mechanisms typically employ a three-axis movement of the carrier and the lens fixed to it relative to the base to achieve autofocus (AF) and optical image stabilization (OIS). Specifically, during optical image stabilization, a movable frame structure is used to move the carrier and lens, allowing them to shift relative to the base in the horizontal directions of the X and Y axes, thereby compensating for image blur caused by hand tremors or external vibrations. During zooming, the carrier and lens are typically moved relative to the frame along the Z-axis (i.e., the optical axis) to change the focal length and achieve sharp imaging.

[0005] To achieve high-precision motion control, the system needs to detect the actual position information of the carrier and frame in their respective motion directions in real time. Therefore, the structural design and control strategy must not only realize independent or combined motion of the carrier in the X, Y, and Z axes, but also effectively integrate position sensing mechanisms, such as Hall sensors or optical encoders, to achieve real-time feedback and closed-loop control of the motion state. Integrating motion execution and position monitoring has become one of the key challenges in improving the performance and reliability of the lens drive module. Summary of the Invention

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

[0007] A lens driving device includes a base and a motor mechanism, the motor mechanism being located on the base and configured to move relative to the base in a third direction;

[0008] The motor mechanism includes a frame and a carrier. The frame is located on the base and is configured to move relative to the base in a third direction. The carrier is located within the frame and is configured to move relative to the frame in a first direction and a second direction.

[0009] Wherein, the first direction is perpendicular to the second direction, the third direction is the optical axis direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0010] Optionally, an AF magnet is provided on one of the inner wall of the base and an AF coil is provided on the other. The AF magnet and the AF coil are arranged opposite each other, and after the AF coil is energized, the frame and the carrier can move relative to the base in a third direction. A third-direction position sensor is provided in the middle or on the side of the AF coil. The third-direction position sensor is connected to the AF coil and is used to detect the current value flowing through the AF coil. The position monitoring of the frame and the carrier when moving in a third direction is realized by the change of the current value.

[0011] Optionally, a plurality of OIS magnets are disposed on one of the frame and the bottom end of the carrier, and a plurality of OIS coils are disposed on the other. Each OIS magnet is disposed opposite to a corresponding OIS coil, and after the OIS coil is energized, the carrier can move relative to the frame along a first direction and a second direction. At least one OIS coil serves as a first direction coil, and a first direction position sensor is disposed in the middle or on the side of the first direction coil. The first direction position sensor is connected to the first direction coil and is used to detect the current value flowing through the first direction coil. The position monitoring of the carrier when moving along the first direction is achieved by the change of the current value. At least one OIS coil serves as a second direction coil, and a second direction position sensor is disposed in the middle or on the side of the second direction coil. The second direction position sensor is connected to the second direction coil and is used to detect the current value flowing through the second direction coil. The position monitoring of the carrier when moving along the second direction is achieved by the change of the current value.

[0012] Optionally, the AF magnet is disposed on the inner wall of one side of the base, the AF coil is disposed on the outer wall of one side of the frame, and the third-party position sensor is located on the frame; a frame-in-place circuit is disposed inside the frame, and the frame-in-place circuit is connected to the base-in-place circuit inside the base through an AF spring; the base-in-place circuit is connected to the third-party position sensor and the AF coil in sequence through the AF spring and the frame-in-place circuit to form a current loop, or the base-in-place circuit is connected to the AF coil and the third-party position sensor in sequence through the AF spring and the frame-in-place circuit to form a current loop.

[0013] Optionally, the AF coil is provided on the inner wall of one side of the base, the AF magnet is provided on the outer wall of one side of the frame, the third-party position sensor is located on the base, and the base has a built-in circuit; the built-in circuit is connected to the third-party position sensor and the AF coil in sequence to form a current loop, or the built-in circuit is connected to the AF coil and the third-party position sensor in sequence to form a current loop.

[0014] Optionally, the frame is provided with a first directional coil and a second directional coil, the bottom of the carrier is provided with an OIS magnet, and both the first directional position sensor and the second directional position sensor are provided on the frame; the frame is provided with a frame-in-frame circuit, which is connected to a base-in-base circuit through an OIS spring; the base-in-base circuit is connected to the first directional position sensor and the first directional coil in sequence through the OIS spring and the frame-in-frame circuit to form a current loop, or the base-in-base circuit is connected to the first directional coil and the first directional position sensor in sequence through the OIS spring and the frame-in-frame circuit to form a current loop; the base-in-base circuit is connected to the second directional position sensor and the second directional coil in sequence through the OIS spring and the frame-in-frame circuit to form a current loop, or the base-in-base circuit is connected to the second directional coil and the second directional position sensor in sequence through the OIS spring and the frame-in-frame circuit to form a current loop.

[0015] Optionally, the frame is provided with the OIS magnet, the bottom of the carrier is provided with the first direction coil and the second direction coil, and the first direction position sensor and the second direction position sensor are both provided on the carrier; the carrier is provided with a carrier-embedded circuit, which is connected to the base-embedded circuit in the base through the OIS spring; the base-embedded circuit is connected to the first direction position sensor and the first direction coil in sequence through the OIS spring and the carrier-embedded circuit to form a current loop, or the base-embedded circuit is connected to the first direction coil and the first direction position sensor in sequence through the OIS spring and the carrier-embedded circuit to form a current loop; the base-embedded circuit is connected to the second direction position sensor and the second direction coil in sequence through the OIS spring and the carrier-embedded circuit to form a current loop, or the base-embedded circuit is connected to the second direction coil and the second direction position sensor in sequence through the OIS spring and the carrier-embedded circuit to form a current loop.

[0016] Optionally, the bottom end of the carrier is provided with the OIS magnet;

[0017] The motor mechanism also includes a circuit board, which is disposed between the bottom end of the carrier and the frame. An elastic part is provided on one side of the circuit board, and one end of the elastic part is connected to the base and electrically connected to the base's built-in circuitry. The base's built-in circuitry supplies power to the circuit board through the elastic part.

[0018] The first directional coil and the second directional coil are provided inside the circuit board or inside the OIS coil board at the top of the circuit board. The first directional position sensor and the second directional position sensor are both provided on the circuit board.

[0019] The base's built-in circuitry connects the first directional position sensor and the first directional coil in sequence through the elastic part and the circuit board to form a current loop, or the base's built-in circuitry connects the first directional coil and the first directional position sensor in sequence through the elastic part and the circuit board to form a current loop.

[0020] The base's built-in circuitry connects the second directional position sensor and the second directional coil in sequence through the elastic part and the circuit board to form a current loop, or the base's built-in circuitry connects the second directional coil and the second directional position sensor in sequence through the elastic part and the circuit board to form a current loop.

[0021] Optionally, the circuit board is an FPC board.

[0022] Optionally, both the first directional position sensor and the second directional position sensor are disposed at the bottom of the circuit board;

[0023] The frame is provided with two sensor clearance slots for avoiding position sensors, and the first directional position sensor and the second directional position sensor are respectively located in the two sensor clearance slots.

[0024] Optionally, the lens driving device further includes a housing, which is detachably connected to the base and forms an outer hollow cavity, and the motor mechanism is disposed within the outer hollow cavity.

[0025] Optionally, the motor mechanism further includes an OIS housing, which is detachably connected to the frame and forms an inner hollow cavity, and the carrier is disposed within the inner hollow cavity.

[0026] Optionally, one side wall of the OIS housing has a drive clearance opening, and one side outer wall of the frame is exposed outside the OIS housing. The one side outer wall of the frame is used to mount an AF coil or an AF magnet.

[0027] Optionally, a frame guide groove is provided on one outer wall of the frame, and a base guide groove is provided on one inner wall of the base. The frame guide groove and the base guide groove are arranged opposite to each other to form a guide mounting groove, and a guide shaft is installed in the guide mounting groove.

[0028] Optionally, the AF magnet is provided on the inner wall of one side of the base, and the AF magnet and the base guide groove are located on the same inner wall of the base. The AF coil is provided on the outer wall of one side of the frame, and the AF coil and the frame guide groove are located on the same outer wall of the frame. The third-party directional position sensor is located on the frame.

[0029] Optionally, a built-in metal plate is provided inside one side of the base, and the built-in metal plate is arranged opposite to the AF magnet and attracts and fixes the AF magnet.

[0030] Optionally, a frame-in-frame metal sheet is provided inside one side of the frame, and the frame-in-frame metal sheet is arranged opposite to the AF magnet and attracts each other.

[0031] Optionally, a plurality of friction-reducing components are provided between the bottom end of the carrier and the frame.

[0032] Optionally, the friction-reducing component is a ball bearing.

[0033] Optionally, ball grooves are provided at the four corners of the bottom of the carrier and at the four corners of the frame, and each ball groove contains a ball, and the carrier is supported in the frame by the ball.

[0034] Optionally, the friction-reducing component is a hemispherical protrusion.

[0035] Optionally, the flat ends of the hemispherical protrusion are located at the four corners of the bottom of the carrier and the protruding ends of the hemispherical protrusion are in contact with the four corners of the frame, or the flat ends of the hemispherical protrusion are located at the four corners of the frame and the protruding ends of the hemispherical protrusion are in contact with the four corners of the bottom of the carrier.

[0036] Beneficial effects: The present invention has at least one or more of the following advantages:

[0037] 1. This invention uses an integrated motor mechanism to achieve the lens's image stabilization function, and achieves the lens's zoom function by moving the motor mechanism and the base along the optical axis. The entire device has a high degree of integration.

[0038] 2. This invention uses a position sensor connected / in series with a coil to detect changes in the current flowing through the coil, thereby achieving position monitoring when the frame and / or carrier moves. Compared with the existing technology that uses a position sensor and a magnet to achieve position monitoring, this invention does not require the use of a magnet positioned opposite the coil, and does not need to consider the monitoring effect caused by induction intensity and environment. The monitoring method of this invention is more direct and has better monitoring effect.

[0039] 3. In this invention, the positions of the AF coil and AF magnet, and the positions of the OIS coil and OIS magnet, can be interchanged; only the corresponding power supply circuits need to be modified. In this invention, the circuit board and OIS coil board can be included or excluded, depending on the specific requirements of the application scenario.

[0040] 4. The present invention adopts a friction-reducing component design, which enables the carrier to be supported within the frame by the friction-reducing component, and achieves the technical effect of reducing friction when the carrier moves in OIS. Attached Figure Description

[0041] Figure 1 is a schematic diagram of one structure of the present invention;

[0042] Figure 2 is a cross-sectional view AA of Figure 1;

[0043] Figure 3 is an exploded view of Figure 1;

[0044] Figure 4 is a further exploded view of Figure 3;

[0045] Figure 5 is an exploded view of the positional relationship between the base, AF magnet and guide shaft of the present invention.

[0046] Figure 6 is a schematic diagram of one structure of the motor mechanism of the present invention;

[0047] Figure 7 is an exploded view of Figure 6;

[0048] Figure 8 is a further exploded view of Figure 7;

[0049] Figure 9 shows the positional relationship between the carrier and the OIS magnet of the present invention;

[0050] Figure 10 is a schematic diagram of one structure of the circuit board of the present invention. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Example 1:

[0057] Referring to Figures 1 to 10, this embodiment provides a lens driving device, which mainly includes a housing 10, a base 20, and a motor mechanism, wherein the motor mechanism includes an OIS housing 30, a frame 40, a carrier 50, and a circuit board 60.

[0058] The outer casing 10 is an optional structure. The outer casing 10 and the base 20 are detachably connected, and the hollow cavity formed therein is an outer hollow cavity. The motor mechanism is housed within the outer hollow cavity. Preferably, the outer casing 10 and the base 20 are connected by a snap-fit ​​mechanism to form the outer hollow cavity.

[0059] The motor mechanism is located on the base 20 and is configured to move relative to the base 20 along the Z-axis. Specifically, the frame 40 of the motor mechanism is located on the base 20 and is configured to move relative to the base 20 along a third direction.

[0060] The OIS housing 30 of the motor mechanism is detachably connected to the frame 40, forming an inner hollow cavity. The carrier 50 and the circuit board 60 are disposed within the inner hollow cavity. Preferably, the OIS housing 30 and the frame 40 are connected by a snap-fit ​​connection to form the inner hollow cavity.

[0061] The carrier 50 is located within the frame 40 and is configured to move relative to the frame 40 along the X-axis and Y-axis directions.

[0062] In addition to the carrier 50, all other components of the lens driving device of the present invention are provided with a lens clearance opening that runs through the Z-axis direction to avoid the lens. The carrier 50 is provided with a lens mounting opening that runs through the Z-axis direction. The lens mounting opening and the lens clearance opening are coaxial (Z-axis). The lens is mounted on the lens mounting opening of the carrier 50. When the carrier 50 moves relative to the frame 40, it can drive the lens to move along the X-axis and Y-axis directions. When the frame 40 moves relative to the base 20, it can drive the carrier 50 and the lens on it to move along the Z-axis direction, thereby realizing the three-axis movement operation of the lens.

[0063] When the carrier 50 and the lens realize three-axis movement operation, a drive component is used. Referring to Figures 4 to 9, the drive component preferably includes an AF magnet 71, an AF coil 72, a number of OIS magnets 73 and a number of OIS coils.

[0064] An AF magnet 71 is provided on one inner wall of the base 20, and an AF coil 72 is provided on one outer wall of the frame 40. The AF magnet 71 and the AF coil 72 are arranged opposite each other, and after the AF coil 72 is energized, the motor mechanism including the frame 40 and the carrier 50 can move relative to the base 20 along the Z-axis.

[0065] Several OIS magnets 73 are provided at the bottom of the carrier 50. A circuit board 60 is disposed between the bottom of the carrier 50 and the frame 40, and an OIS coil plate 61 is disposed at the top of the circuit board 60, located between the circuit board 60 and the carrier 50. Several OIS coils are disposed inside the OIS coil plate 61, and each OIS magnet 73 is respectively disposed opposite to a corresponding OIS coil. After the OIS coil is energized, the carrier 50 can move relative to the frame 40 along the X-axis and Y-axis directions.

[0066] Referring to Figures 3 to 8 and Figure 10, a flexible part 62 is provided on one side of the circuit board 60. One end of the flexible part 62 is connected to the base 20 and electrically connected to the base-built-in circuitry within the base 20. The base-built-in circuitry supplies power to the circuit board 60 through the flexible part 62. The flexible part 62 can maintain the energized state of the base-built-in circuitry unaffected when the circuit board 60 moves in the Z-axis direction with the motor mechanism.

[0067] The AF coil 72 is powered by the built-in circuitry of the base, which passes through the elastic part 62, the circuit board 60, and the built-in circuitry of the frame in sequence. The OIS coil is powered by the built-in circuitry of the base, which passes through the elastic part 62, the circuit board 60, and the OIS coil board 61 in sequence.

[0068] In a specific implementation, referring to Figure 5, a circuit board connection protrusion 23 that is electrically connected to the built-in circuit of the base 20 can be provided on the base 20. One end of the elastic part 62 is electrically connected to the circuit board connection protrusion 23 to realize the electrical connection with the built-in circuit of the base.

[0069] Of course, the OIS coil board 61 can be omitted. In this case, the circuit board 60 is equipped with several OIS coils. The OIS coils are powered by the built-in circuit of the base, through the elastic part 62 and the circuit board 60.

[0070] In one embodiment, the circuit board 60 is an FPC board.

[0071] In one embodiment, the drive assembly further includes a first orientation position sensor 75, a second orientation position sensor 76, and a third orientation position sensor 77.

[0072] Referring to Figure 10, both the first directional position sensor 75 and the second directional position sensor 76 are mounted on the circuit board 60. Power is supplied to the first directional position sensor 75 and the second directional position sensor 76 via the built-in wiring in the base, through the elastic part 62, and the circuit board 60.

[0073] At least one OIS coil serves as the first direction coil, and the first direction position sensor 75 is located below the first direction coil, or it can be located at other positions close to the first direction coil. The first direction position sensor 75 is connected to the first direction coil, and when connected, the first direction position sensor 75 is connected to the first direction coil through the circuit board 60 and the OIS coil. The first direction position sensor 75 is used to detect the current value flowing through the first direction coil, and the position monitoring of the carrier 50 when it moves along the X-axis is achieved by the change in the current value.

[0074] In this embodiment, the current loop relationship between the first directional position sensor 75 and the first directional coil can be as follows: the current flowing from the external power source flows sequentially through the base's built-in circuit, the elastic part 62, the circuit board 60, the first directional position sensor 75, and the first directional coil to ground; or, the current flowing from the external power source flows sequentially through the base's built-in circuit, the elastic part 62, the circuit board 60, the first directional coil, and the first directional position sensor 75 to ground.

[0075] At least one OIS coil serves as the second direction coil, and the second direction position sensor 76 is located below the second direction coil, or it can be located at other positions close to the second direction coil. The second direction position sensor 76 is connected to the second direction coil, and when connected, the second direction position sensor 76 is connected to the second direction coil through the circuit board 60 and the OIS coil. The second direction position sensor 76 is used to detect the current value flowing through the second direction coil, and the position monitoring of the carrier 50 when it moves along the second direction is achieved by the change in the current value.

[0076] In this embodiment, the current loop relationship between the second directional position sensor 76 and the second directional coil can be as follows: the current flowing from the external power source flows sequentially through the base's built-in circuit, the elastic part 62, the circuit board 60, the second directional position sensor 76, and the second directional coil to ground; or, the current flowing from the external power source flows sequentially through the base's built-in circuit, the elastic part 62, the circuit board 60, the second directional coil, and the second directional position sensor 76 to ground.

[0077] Referring to Figure 6, a third-direction position sensor 77 is disposed on one outer wall of the frame 40. The third-direction position sensor 77 is located in the middle of the AF coil 72, but it can also be located in other positions close to the AF coil 72. The third-direction position sensor 77 is connected to the AF coil 72 through the frame's built-in wiring. The third-direction position sensor 77 is used to detect the current value flowing through the AF coil 72, and the position monitoring of the frame 40 and the carrier 50 during movement along the third direction is achieved by detecting changes in the current value.

[0078] In this embodiment, the current loop relationship between the third-party position sensor 77 and the AF coil 72 can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the elastic part 62, the circuit board 60, the frame built-in circuit, the third-party position sensor 77, and the AF coil 72 to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the elastic part 62, the circuit board 60, the frame built-in circuit, the AF coil 72, and the third-party position sensor 77 to ground.

[0079] In one embodiment, referring to FIG10, the first directional position sensor 75 and the second directional position sensor 76 are both disposed at the bottom of the circuit board 60.

[0080] Referring to Figure 8, the frame 40 is provided with two sensor avoidance slots 42 for avoiding position sensors. The first direction position sensor 75 and the second direction position sensor 76 are respectively located in the two sensor avoidance slots 42.

[0081] In one embodiment, referring to Figures 6 and 7, one side wall of the OIS housing 30 has a drive clearance opening 31, and an AF coil 72 is installed on one side outer wall of the frame 40. The AF coil 72 is exposed in the OIS housing 30 through the drive clearance opening 31, so that there is no obstruction between the AF coil 72 and the AF magnet 71, which facilitates the driving action in the AF direction.

[0082] In one embodiment, referring to Figures 3 to 8, a frame guide groove 41 is provided on one outer wall of the frame 40. A base guide groove 21 is provided on one inner wall of the base 20. The frame guide groove 41 and the base guide groove 21 are arranged opposite each other to form a guide mounting groove. A guide shaft 80 is installed in the guide mounting groove. The length direction of the guide shaft 80 is the Z-axis direction, and the Z-axis direction is guided by the guide shaft 80.

[0083] Preferably, the frame guide groove 41 and the AF coil 72 are located on the same outer wall of the frame 40. The base guide groove 21 and the AF magnet 71 are located on the same inner wall of the base 20.

[0084] Preferably, two frame guide grooves 41 are provided on one outer wall of the frame 40, and the two frame guide grooves 41 are respectively located on both sides of the AF coil 72. Two base guide grooves 21 are provided on one inner wall of the base 20, and the two base guide grooves 21 are respectively located on both sides of the AF magnet 71. This results in a guide shaft 80 being provided in each of the guide mounting grooves formed on both sides of the AF magnet 71 and the AF coil 72.

[0085] In one embodiment, referring to FIG5, a base-integrated metal plate 22 is provided inside one side of the base 20. The base-integrated metal plate 22 is disposed opposite to the AF magnet 71 and attracts and fixes the AF magnet 71.

[0086] In one embodiment, a frame-in-frame metal sheet is provided inside one side of the frame 40, and the frame-in-frame metal sheet is disposed opposite to the AF magnet 71 and attracts each other.

[0087] The metal sheet inside the frame will generate an attractive force with the AF magnet 71. This attractive force can bring the side wall of the frame 40 and the inner wall of the base 20 closer together, preventing the guide shaft 80 from detaching from the guide groove.

[0088] The metal sheet built into the frame is preferably made of iron.

[0089] In one embodiment, a plurality of friction-reducing components are provided between the bottom end of the carrier 50 and the frame 40.

[0090] The design of the friction-reducing component allows the carrier 50 to be supported within the frame 40, and it also reduces friction when the carrier 50 moves in OIS.

[0091] Referring to Figure 8, the friction-reducing component is a ball bearing 90.

[0092] Of course, the friction-reducing component can also be other friction-reducing components, such as hemispherical protrusions, which can also reduce friction when the carrier 50 moves in OIS.

[0093] In one embodiment, referring to Figures 8 and 9, ball grooves 91 are provided at the four corners of the bottom of the carrier 50 and the four corners of the frame 40, and each ball groove 91 contains a ball 90. The carrier 50 is supported in the frame 40 by the ball 90.

[0094] In one embodiment, the flat ends of the hemispherical protrusions are located at the four corners of the bottom of the carrier 50, and the protruding ends of the hemispherical protrusions are in contact with the four corners of the frame 40.

[0095] In one embodiment, the planar ends of the hemispherical protrusions are located at the four corners of the frame 40, and the protruding ends of the hemispherical protrusions are in contact with the four corners of the bottom of the carrier 50.

[0096] Example 2:

[0097] This embodiment provides a lens driving device. Compared with embodiment 1, the circuit board 60 and OIS coil board 61 are omitted, while the rest of the structure is the same as that of embodiment 1.

[0098] In this embodiment, the OIS coil, the first direction position sensor 75, and the second direction position sensor 76 are directly mounted on the frame 40, and the OIS coil, the first direction position sensor 75, the second direction position sensor 76, the AF coil 72, and the third direction position sensor 77 are powered by the frame-built circuitry within the frame 40.

[0099] Specifically, the frame 40 is equipped with a first direction coil and a second direction coil. The frame's internal wiring is connected to the base's internal wiring in the base 20 via an OIS spring. The frame's internal wiring is also connected to the base's internal wiring in the base 20 via an AF spring. The OIS and AF springs maintain their energized state with the base's internal wiring unaffected when the frame 40 moves along the Z-axis with the motor mechanism. In a practical implementation, the OIS and AF springs can be integrated into a single spring, which can house three independent electrical connection lines to allow each of the three current loops to operate independently.

[0100] In this embodiment, the current loop relationship between the first directional position sensor 75 and the first directional coil can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the first directional position sensor 75, and the first directional coil to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the first directional coil, and the first directional position sensor 75 to ground.

[0101] In this embodiment, the current loop relationship between the second direction position sensor 76 and the second direction coil can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the second direction position sensor 76, and the second direction coil to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the second direction coil, and the second direction position sensor 76 to ground.

[0102] In this embodiment, the current loop relationship between the third-party position sensor 77 and the AF coil 72 can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the third-party position sensor 77, the AF coil 72 to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the spring, the frame built-in circuit, the AF coil 72, the third-party position sensor 77 to ground.

[0103] Example 3:

[0104] This embodiment provides a lens driving device. Compared with Embodiment 1, the positions of the AF magnet 71 and the AF coil 72 are interchanged, while the rest of the structure is the same as that of Embodiment 1.

[0105] In this embodiment, an AF coil 72 is provided on one inner wall of the base 20, an AF magnet 71 is provided on one outer wall of the frame 40, a third directional position sensor 77 is located on the base 20, and a base-built circuit is provided inside the base 20.

[0106] In this embodiment, the current loop relationship between the third-party position sensor 77 and the AF coil 72 can be: the current flowing from the external power source flows sequentially through the base's built-in circuit, the third-party position sensor 77, and the AF coil 72 to ground; or, the current flowing from the external power source flows sequentially through the base's built-in circuit, the AF coil 72, and the third-party position sensor 77 to ground.

[0107] Example 4:

[0108] This embodiment provides a lens driving device. Compared with embodiment 1, the circuit board 60 and OIS coil board 61 are eliminated. Compared with embodiment 2, the positions of OIS magnet 73 and OIS coil are interchanged. The rest of the structure is the same as that of embodiment 1 and embodiment 2.

[0109] In this embodiment, an OIS magnet 73 is provided on the frame 40, and a first direction coil and a second direction coil are provided at the bottom of the carrier 50. The first direction position sensor 75 and the second direction position sensor 76 are both located on the carrier 50. An internal carrier circuit is provided inside the carrier 50, and this internal carrier circuit is connected to the internal base circuit in the base 20 via an OIS spring. The OIS spring can maintain its connection to the internal base circuit unaffected when the carrier 50 performs triaxial motion.

[0110] In this embodiment, the current loop relationship between the first directional position sensor 75 and the first directional coil can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the OIS spring, the carrier built-in circuit, the first directional position sensor 75, and the first directional coil to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the OIS spring, the carrier built-in circuit, the first directional coil, and the first directional position sensor 75 to ground.

[0111] In this embodiment, the current loop relationship between the second directional position sensor 76 and the second directional coil can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the OIS spring, the carrier built-in circuit, the second directional position sensor 76, and the second directional coil to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the OIS spring, the carrier built-in circuit, the second directional coil, and the second directional position sensor 76 to ground.

[0112] In practical implementation, the OIS reed has two independent electrical connection lines built in, so that the two current loops can operate independently.

[0113] The frame 40 has built-in wiring that connects to the base 20's built-in wiring via an AF spring. The AF spring ensures that the frame 40 remains energized with the base's built-in wiring as the motor mechanism moves along the Z-axis.

[0114] In this embodiment, the current loop relationship between the third-party position sensor 77 and the AF coil 72 can be as follows: the current flowing from the external power source flows sequentially through the base built-in circuit, the AF spring, the frame built-in circuit, the third-party position sensor 77, and the AF coil 72 to ground; or, the current flowing from the external power source flows sequentially through the base built-in circuit, the AF spring, the frame built-in circuit, the AF coil 72, and the third-party position sensor 77 to ground.

[0115] 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 lens driving device, characterized in that, The lens driving device includes a base and a motor mechanism. The motor mechanism is located on the base and is configured to move relative to the base in a third direction. The motor mechanism includes a frame and a carrier. The frame is located on the base and is configured to move relative to the base in a third direction. The carrier is located within the frame and is configured to move relative to the frame in a first direction and a second direction.

2. The lens driving device as described in claim 1, characterized in that, An AF magnet is disposed on one of the inner wall of the base and an AF coil is disposed on the other. The AF magnet and the AF coil are positioned opposite each other, and the frame and the carrier can move relative to the base in a third direction after the AF coil is energized. A third-direction position sensor is disposed in the middle or on the side of the AF coil. The third-direction position sensor is connected to the AF coil and is used to detect the current value flowing through the AF coil. The position monitoring of the frame and the carrier during movement in the third direction is achieved by the change in the current value. And / or, a plurality of OIS magnets are disposed on one of the frame and the bottom end of the carrier, and a plurality of OIS coils are disposed on the other. Each OIS magnet is positioned opposite to a corresponding OIS coil and the OIS coil is energized. After the coil is energized, the carrier can move relative to the frame along a first direction and a second direction. At least one of the OIS coils serves as the first direction coil, and a first direction position sensor is provided in the middle or on the side of the first direction coil. The first direction position sensor is connected to the first direction coil and is used to detect the current value flowing through the first direction coil. The position monitoring of the carrier when it moves along the first direction is achieved by the change in the current value. At least one of the OIS coils serves as the second direction coil, and a second direction position sensor is provided in the middle or on the side of the second direction coil. The second direction position sensor is connected to the second direction coil and is used to detect the current value flowing through the second direction coil. The position monitoring of the carrier when it moves along the second direction is achieved by the change in the current value.

3. The lens driving device as described in claim 2, characterized in that, The AF magnet is provided on the inner wall of one side of the base, and the AF coil is provided on the outer wall of one side of the frame. The third-party position sensor is located on the frame. The frame has built-in wiring, which is connected to the base built-in wiring in the base through an AF spring. The base's built-in circuitry connects the third-party directional position sensor and the AF coil sequentially via the AF spring and the frame's built-in circuitry to form a current loop; alternatively, the base's built-in circuitry connects the AF coil and the third-party directional position sensor sequentially via the AF spring and the frame's built-in circuitry to form a current loop; or, the AF coil is disposed on the inner wall of one side of the base, the AF magnet is disposed on the outer wall of one side of the frame, the third-party directional position sensor is located on the base, and the base has built-in circuitry inside; the base's built-in circuitry connects the third-party directional position sensor and the AF coil sequentially to form a current loop, or the base's built-in circuitry connects the AF coil and the third-party directional position sensor sequentially to form a current loop.

4. The lens driving device as described in claim 2, characterized in that, The frame is provided with a first directional coil and a second directional coil, the bottom end of the carrier is provided with an OIS magnet, and the first directional position sensor and the second directional position sensor are both provided on the frame; the frame is provided with a frame-in-frame circuit, and the frame-in-frame circuit is connected to the base-in-base circuit through an OIS spring. The base's built-in circuitry connects the first directional position sensor and the first directional coil sequentially via the OIS spring and the frame's built-in circuitry to form a current loop; or the base's built-in circuitry connects the first directional coil and the first directional position sensor sequentially via the OIS spring and the frame's built-in circuitry to form a current loop; the base's built-in circuitry connects the second directional position sensor and the second directional coil sequentially via the OIS spring and the frame's built-in circuitry to form a current loop; or the base's built-in circuitry connects the second directional coil and the second directional position sensor sequentially via the OIS spring and the frame's built-in circuitry to form a current loop; or, the frame is equipped with the OIS magnet, and the bottom of the carrier is equipped with the first directional coil and the second directional coil, the first directional position sensor, the second... All orientation and position sensors are mounted on the carrier; the carrier contains built-in circuitry, which is connected to the base's built-in circuitry via OIS springs; the base's built-in circuitry, through the OIS springs and the carrier's built-in circuitry, sequentially connects to the first orientation and position sensor and the first orientation coil to form a current loop, or the base's built-in circuitry, through the OIS springs and the carrier's built-in circuitry, sequentially connects to the first orientation coil and the first orientation and position sensor to form a current loop; the base's built-in circuitry, through the OIS springs and the carrier's built-in circuitry, sequentially connects to the second orientation and position sensor and the second orientation coil to form a current loop, or the base's built-in circuitry, through the OIS springs and the carrier's built-in circuitry, sequentially connects to the second orientation coil and the second orientation and position sensor to form a current loop.

5. The lens driving device as described in claim 2, characterized in that, The OIS magnet is disposed at the bottom of the carrier; the motor mechanism also includes a circuit board, which is disposed between the bottom of the carrier and the frame. An elastic portion is disposed on one side of the circuit board, one end of which is connected to the base and electrically connected to the base's internal wiring. The base's internal wiring supplies power to the circuit board through the elastic portion. A first direction coil and a second direction coil are disposed inside the circuit board or inside the OIS coil board disposed at the top of the circuit board. The first and second direction position sensors are both disposed on the circuit board. The base's internal wiring connects the first direction position sensor and the first direction coil sequentially through the elastic portion and the circuit board to form a current loop, or the base's internal wiring connects the first direction coil and the first direction position sensor sequentially through the elastic portion and the circuit board to form a current loop. The base's internal wiring connects the second direction position sensor and the second direction coil sequentially through the elastic portion and the circuit board to form a current loop, or the base's internal wiring connects the second direction coil and the second direction position sensor sequentially through the elastic portion and the circuit board to form a current loop. Preferably, the circuit board is an FPC board.

6. The lens driving device as described in claim 5, characterized in that, Both the first directional position sensor and the second directional position sensor are disposed at the bottom of the circuit board; the frame is provided with two sensor clearance slots for avoiding the position sensors, and the first directional position sensor and the second directional position sensor are respectively located in the two sensor clearance slots.

7. The lens driving device according to any one of claims 1 to 6, characterized in that, The lens driving device also includes a housing, which is detachably connected to the base and forms an outer hollow cavity, and the motor mechanism is disposed in the outer hollow cavity.

8. The lens driving device according to any one of claims 1 to 6, characterized in that, The motor mechanism also includes an OIS housing, which is detachably connected to the frame and forms an inner hollow cavity, and the carrier is disposed in the inner hollow cavity; preferably, one side wall of the OIS housing has a drive clearance opening, and one side outer wall of the frame is exposed outside the OIS housing, and one side outer wall of the frame is used to install an AF coil or an AF magnet.

9. The lens driving device according to any one of claims 1 to 6, characterized in that, A frame guide groove is provided on one outer wall of the frame, and a base guide groove is provided on one inner wall of the base. The frame guide groove and the base guide groove are arranged opposite each other to form a guide mounting groove, and a guide shaft is installed in the guide mounting groove. Preferably, an AF magnet is provided on one inner wall of the base, and the AF magnet and the base guide groove are located on the same inner wall of the base. An AF coil is provided on one outer wall of the frame, and the AF coil and the frame guide groove are located on the same outer wall of the frame. A third-party directional position sensor connected to the AF coil is located on the frame. More preferably, a base-embedded metal plate is provided inside one side of the base, and the base-embedded metal plate is arranged opposite to the AF magnet and attracts and fixes the AF magnet. More preferably, a frame-embedded metal sheet is provided inside one side of the frame, and the frame-embedded metal sheet is arranged opposite to the AF magnet and attracts each other.

10. The lens driving device according to any one of claims 1 to 6, characterized in that, A plurality of friction-reducing components are provided between the bottom end of the carrier and the frame; preferably, the friction-reducing components are ball bearings; more preferably, ball bearing grooves are provided at the four corners of the bottom end of the carrier and the four corners of the frame, and each ball bearing is placed in the ball bearing groove, and the carrier is supported in the frame by the ball bearings; preferably, the friction-reducing component is a hemispherical protrusion; more preferably, the flat end of the hemispherical protrusion is located at the four corners of the bottom end of the carrier and the protruding end of the hemispherical protrusion contacts the four corners of the frame, or the flat end of the hemispherical protrusion is located at the four corners of the frame and the protruding end of the hemispherical protrusion contacts the four corners of the bottom end of the carrier.

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