Image stabilization motor and camera equipment having the image stabilization motor

Abstract

An image stabilization motor for driving a lens module includes a stator assembly and a movable component that is movable relative to the stator assembly. The movable component is integrally formed with or fixed to the lens module. The stator assembly includes a base and an outer capacitor substrate, a first circuit board, and a second circuit board disposed on the base. The first circuit board has a focusing coil, and the second circuit board has an optical image stabilization coil. The movable component includes an inner capacitor substrate and a magnet. The capacitance formed by the outer capacitor substrate and the inner capacitor substrate is used to determine the direction and distance of movement of the movable component relative to the stator assembly. The focusing coil and the magnet are used to generate a focusing driving force for driving the movable component to focus. The optical image stabilization coil and the magnet are used to generate an image stabilization driving force for driving the movable component to perform optical image stabilization.

Description

Technical Field

[0001] This invention belongs to the field of camera technology, and in particular relates to a stabilization motor for camera equipment and a camera equipment having the stabilization motor. Background Technology

[0002] To improve image quality during video recording, existing cameras widely employ optical image stabilization (OIS) technology to compensate for camera shake during filming. OIS primarily utilizes a gyroscope and a stabilization motor within the camera. During motion compensation, the gyroscope detects camera shake, and the stabilization motor controls the camera lens to move in the opposite direction of the shake, thus compensating for image blur caused by camera movement.

[0003] In the aforementioned motion compensation process, before controlling lens movement via the image stabilization motor, the real-time position of the motor's actuator must first be detected to determine the specific direction and magnitude of lens movement. Existing technologies for detecting the real-time position of the image stabilization motor actuator include methods such as optical detection, Hall sensor detection, and capacitance signal detection. Among these, image stabilization motors using capacitance signal detection are increasingly widely used due to their smaller hardware size and relatively simpler structure.

[0004] In the prior art, the technical principle of detecting the real-time position of the mover in a shake-stabilized motor through a capacitor signal is as follows: stator electrode plates and mover electrode plates are respectively set on the stator and mover of the shake-stabilized motor. The stator electrode plates and mover electrode plates are arranged opposite each other to form a capacitor, and the processing unit is connected to the stator electrode plates and mover electrode plates. When the mover moves relative to the stator due to shaking, the area of ​​the stator electrode plates and mover electrode plates that are aligned with each other and the distance between them may change, resulting in a change in the capacitance value of the capacitor formed by the stator electrode plates and mover electrode plates. At this time, the processing unit can determine the real-time position of the mover relative to the stator based on the specific capacitance value formed by the stator electrode plates and mover electrode plates.

[0005] However, in practical applications, the above-mentioned existing image stabilization motor technology still has some shortcomings, such as: (1) Its processing unit determines the real-time position of the mover relative to the stator based on the capacitance value formed by the stator electrode plate and the mover electrode plate. However, since the capacitance value is affected by the area of ​​the stator electrode plate and the mover electrode plate aligned with each other and the distance between them, different combinations of these two parameters may produce the same capacitance value. Therefore, the same capacitance value may correspond to multiple different mover positions. The above-mentioned existing technology cannot distinguish the different mover positions corresponding to the same capacitance value. (2) Its processing unit can determine the real-time position of the mover based on the capacitance value, but it is difficult to determine the direction of movement of the mover before it reaches the determined position. Therefore, it is difficult to determine the actual shaking direction of the lens, which may lead to errors in the compensation scheme. (3) In the above-mentioned existing image stabilization motor, the structure of the stator electrode plate and the mover electrode plate used to detect the position of the mover is relatively simple. However, the mechanism and circuit used to drive the lens to move for shake compensation and autofocus usually still use existing technology and have a more complex structure.

[0006] Therefore, it is necessary to provide a more novel image stabilization motor and corresponding camera equipment with a more novel structure and working principle to solve the above-mentioned defects of existing image stabilization motors. Summary of the Invention

[0007] Based on the aforementioned problems in the prior art, the purpose of this invention is to provide a more novel image stabilization motor and corresponding camera device in terms of structure and working principle, so as to solve the various defects of existing image stabilization motors, such as the inability to distinguish different positions of the same capacitor value, the difficulty in determining the actual shaking direction of the lens, and the lack of improvement in the mechanism and circuit used to drive the lens to move for shake compensation and autofocus.

[0008] To address the aforementioned problems, one embodiment of the present invention provides an image stabilization motor for driving a lens module. The image stabilization motor includes a stator assembly and a movable component that is movable relative to the stator assembly. The movable component is integrally formed with or fixed to the lens module. The stator assembly includes a base and an outer capacitor substrate, a first circuit board, and a second circuit board disposed on the base. The first circuit board has a focusing coil, and the second circuit board has an optical image stabilization coil. The movable component includes an inner capacitor substrate and a magnet. The capacitance formed by the outer capacitor substrate and the inner capacitor substrate is used to determine the direction and distance of movement of the movable component relative to the stator assembly. The focusing coil and the magnet are used to generate a focusing driving force for driving the movable component to focus. The optical image stabilization coil and the magnet are used to generate an image stabilization driving force for driving the movable component to perform optical image stabilization.

[0009] In some embodiments, the outer substrate of the capacitor is integrally formed with the base, and the inner substrate of the capacitor and the magnet are integrally formed with the lens module.

[0010] In some embodiments, there are multiple outer capacitor substrates and one-to-one correspondences between them. Each inner capacitor substrate and its corresponding outer capacitor substrate are arranged in parallel and can be moved relative to each other. The change in capacitance value formed by each inner capacitor substrate and its corresponding outer capacitor substrate is used to determine the moving direction and moving distance of the mover assembly relative to the stator assembly.

[0011] In some embodiments, the magnet consists of two sub-magnets arranged side by side and attached together, with the magnetic poles of the two sub-magnets being staggered; in the direction of movement of the moving sub-assembly for focusing, the dividing line between the magnetic poles of the sub-magnets is set to align with the interior of the focusing coil; in the direction of movement of the moving sub-assembly for optical image stabilization, the dividing line between the magnetic poles of the sub-magnets is set to align with the interior of the optical image stabilization coil.

[0012] In some embodiments, the mover assembly further includes an upper spring sheet, which includes an upper spring sheet body mounted outside the lens module. The upper spring sheet body extends outward to form an upper connecting end with a tortuous shape, the upper connecting end being used for connection with the base. Both the upper spring sheet body and the upper connecting end are elastic.

[0013] In some embodiments, the moving part assembly further includes a lower spring, the lower spring including a lower spring body mounted on the bottom of the lens module, the lower spring body extending outward to a lower connecting end with a tortuous shape, the lower connecting end for connection with the base; both the lower spring body and the lower connecting end are elastic.

[0014] In some embodiments, both the upper and lower springs are made of conductive material and are connected to the inner substrate of the capacitor, so that the inner substrate of the capacitor is coupled through the upper and lower springs.

[0015] In some embodiments, the stator assembly further includes a capacitor inner substrate terminal for electrically connecting the capacitor inner substrate to an external source and a stabilization coil terminal for electrically connecting the optical image stabilization coil to an external source, both the capacitor inner substrate terminal and the stabilization coil terminal being disposed on the base.

[0016] In some embodiments, the optical image stabilization coil is formed on the surface of the second circuit board by etching.

[0017] Another embodiment of the present invention provides a camera device, including a lens module and the image stabilization motor described in the above embodiment, wherein the image stabilization motor is used to drive the lens module.

[0018] Compared with the prior art, the image stabilization motor and corresponding camera device provided by the above-mentioned preferred embodiments of the present invention can achieve many beneficial effects when driving the lens module, such as: (1) By measuring the capacitance signal changes of multiple capacitors composed of multiple sets of parallel capacitor substrates, the movement direction, movement distance and specific position of the lens module driven by the image stabilization motor in three dimensions can be accurately detected, solving the problem in the prior art that it is difficult to determine the specific position and shaking direction of the lens module based solely on the capacitance value between the stator electrode plate and the mover electrode plate. (2) The inner and outer substrates of the capacitor are integrally formed with the image stabilization motor base and the lens module, respectively, to form an integrated stator assembly and mover assembly. This not only reduces the structural size, but also reduces the assembly process of the image stabilization motor to a large extent by using an integral manufacturing method. (3) The upper and lower springs use a four-corner connection structure, and the connection end adopts a zigzag structure design, such as an S-shaped design, which can replace the relatively complex suspension wire and ball bearing mechanism commonly used in existing image stabilization motors, and can prevent the springs from breaking during the OIS process. (4) The magnet used to provide the magnetic field is also integrally formed with the lens module, and the upper and lower springs are connected to the base. Compared with the suspension wire type OIS mechanism commonly used in existing image stabilization motors, the independent magnet carrier and suspension wire are eliminated. Compared with the ball bearing type OIS mechanism commonly used in existing image stabilization motors, the independent AF mechanism carrier, ball bearings and their guide rails are eliminated, which can effectively simplify the structure and reduce costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of a shake-stabilizing motor according to a preferred embodiment of the present invention.

[0021] Figure 2 yes Figure 1 The diagram shows the cross-sectional structure of the assembled anti-shake motor.

[0022] Figure 3 yes Figure 1 The diagram shows the bottom structure of the assembled anti-shake motor.

[0023] Figure 4 yes Figure 1 The diagram shows the principle of how the image stabilization motor detects the movement of the lens in the Z-axis direction.

[0024] Figure 5 yes Figure 1 The diagram shows the principle of how the image stabilization motor detects the movement of the lens in the X and Y axes.

[0025] Figure 6 yes Figure 1 The diagram shows the structure of the stator assembly AF section of the anti-shake motor.

[0026] Figure 7 yes Figure 1 The diagram shows the structure of the mover assembly of the anti-shake motor, with a portion of the mover assembly cut off for easier observation.

[0027] Figure 8 yes Figure 1 The diagram shows the magnetic pole distribution of the magnets in the anti-shake motor.

[0028] Figure 9 yes Figure 1 The diagram shown illustrates the working principle of the image stabilization motor for autofocus.

[0029] Figure 10 yes Figure 1 The diagram shows the operation of the image stabilization motor during autofocus.

[0030] Figure 11 yes Figure 1 The diagram shows the structure of the OIS (Optical Image Stabilizer) component of the anti-shake motor.

[0031] Figure 12 yes Figure 1 The diagram shown illustrates the working principle of optical image stabilization achieved by the anti-shake motor. Detailed Implementation

[0032] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0033] The main objective of this invention is to provide a more novel image stabilization motor and corresponding camera device in terms of structure and working principle, so as to solve the problems of existing image stabilization motors, such as the inability to distinguish different positions of the same capacitor value, the difficulty in determining the actual direction of lens shaking, and the lack of improvement in the mechanism and circuit for shaking compensation and autofocus.

[0034] Please see Figure 1 , Figure 2 and Figure 3 A preferred embodiment of the present invention provides an image stabilization motor, which includes a housing 1, an upper spring 2, an inner capacitor substrate 4, an outer capacitor substrate 5, a magnet 6, a focusing coil 7, a first circuit board 8, a lower spring 9, a second circuit board 10, a base 11, terminals on the inner capacitor substrate 12, and terminals on the image stabilization coil 13. The image stabilization motor is used to provide automatic focus (AF) and optical image stabilization (OIS) functions for the corresponding type of lens module 3 shown in the figure.

[0035] The outer casing 1 is generally rectangular box-shaped, with a top plate that is roughly square and four side plates that are roughly rectangular. The top plate has an upper lens opening in the center for the lens module 3 to extend from. The four side plates are perpendicularly connected to the edge of the top plate on the same surface, and are joined end-to-end to form a rectangular frame. The outer casing 1 houses the other components of the image stabilization motor, protecting its internal structure. Preferably, the outer casing 1 is partially or entirely made of a magnetically conductive material, which enhances the electromagnetic effect generated by the image stabilization motor, thereby increasing the electromagnetic driving force provided by the motor.

[0036] The upper spring piece 2 includes two generally semi-circular upper spring piece bodies, which are mounted on the outside of the lens module 3 and form a ring around the lens module 3. Each upper spring piece body extends at least two elongated upper connecting ends for connecting the upper spring piece 2 to the inner wall of the base 11 (described in detail below) to fix the upper spring piece 2 to the top of the base 11. Both the upper spring piece body and the upper connecting ends of the upper spring piece 2 are elastic. When the lens module 3 is fitted into the upper spring piece body, the upper spring piece body can use its own elasticity to generate a restoring force to eliminate the offset of the lens module 3 in its optical axis direction (hereinafter referred to as the Z-axis direction). The upper connecting ends can use their own elasticity to generate a restoring force to eliminate the offset of the lens module 3 in two directions perpendicular to its optical axis direction (hereinafter referred to as the X-axis direction and Y-axis direction). The shape of each upper connecting end is preferably formed as a tortuous shape, such as an S-shape, which helps to improve the stress resistance during deformation and prevents breakage by external forces or internal stress during operation. In this embodiment, the upper spring 2 is made of a conductive material such as a metal material. In addition to providing elastic restoring force, it is also connected to the inner substrate 4 of the capacitor (described in detail below) to serve as the power supply circuit for the inner substrate 4 of the capacitor.

[0037] The lens module 3 includes a lens housing and a lens assembly (not shown in the figure) installed inside the lens housing. The lens housing has a generally prism-shaped lens base and a generally conical insertion part. The lens base and the insertion part are coaxially connected, and the bottom surface of the insertion part is connected to the center of the top surface of the lens base. The two upper spring bodies of the upper spring 2 form a ring around the insertion part. During assembly, the end of the insertion part can pass through the upper lens hole opened on the top plate of the housing 1, so that the lens module 3 extends out of the housing 1 to capture images. The capacitor inner substrate 4 and the magnet 6 are preferably both mounted on the lens base. The lens assembly can completely adopt existing technology, so it is not shown in the figure, and its specific features need not be described.

[0038] The inner capacitor substrate 4 is flat, preferably rectangular, and is fixedly mounted on the outer surface of the lens base. In this embodiment, the number of inner capacitor substrates 4 is preferably four, corresponding to the approximately quadrangular prism shape of the lens base, i.e., respectively mounted on the four sides of the lens base and respectively connected to the four upper connecting ends of the upper spring 2, which can be connected to an external power source through the upper spring 2. In this embodiment, the inner capacitor substrate 4 is preferably integrally formed with the lens housing by manufacturing means such as injection molding.

[0039] The capacitor outer substrate 5 includes a flat outer substrate body and elongated outer substrate pins extending from the bottom end of the outer substrate body. The outer substrate pins are preferably arranged to extend in a direction perpendicular to the outer substrate body. The number of capacitor outer substrates 5 corresponds to the number of capacitor inner substrates 4. For example, in this embodiment, there can be four capacitor outer substrates 5, corresponding one-to-one with the capacitor inner substrates 4. Each capacitor outer substrate 5 is mounted on the outside of its corresponding capacitor inner substrate 4, parallel to the corresponding capacitor inner substrate 4 and spaced apart by a predetermined distance. Thus, when a voltage is applied to each pair of corresponding capacitor inner substrates 4 and capacitor outer substrates 5, a capacitor is formed. Furthermore, the mounting method of each capacitor inner substrate 4 is configured to generate displacement in three directions (X-axis, Y-axis, and Z-axis) relative to its corresponding capacitor outer substrate 5, so that the capacitance change caused by the displacement can be used to detect the shaking of the lens module 3. The specific mounting method will be described in detail below in conjunction with other components. In this embodiment, the capacitor outer substrate 5 is preferably integrally formed with the base 11 by manufacturing means such as injection molding.

[0040] Magnet 6 is preferably a bar magnet, and the number is preferably four, which are respectively embedded inside the four sides of the lens base, that is, respectively encapsulated inside the four capacitor inner substrates 4. Magnet 6 can also preferably be integrally formed with the base 11 by means of manufacturing such as injection molding. Magnet 6 is used to provide the necessary permanent magnetic field for the AF and OIS functions of the image stabilization motor.

[0041] The focusing coil 7 is preferably a square coil, and there are four of them, which are respectively disposed on the outside of the four capacitor outer substrates 5 and aligned with the four magnets 6. When the focusing coil 7 is energized, the energized focusing coil 7 will generate an electromagnetic thrust due to electromagnetic induction in the magnetic field of the magnet 6. This electromagnetic thrust provides power for the AF process.

[0042] The first circuit board 8 is preferably rectangular and flat, and there are preferably four of them. They are respectively disposed on the outside of the four outer capacitor substrates 5, and are preferably aligned with the four inner capacitor substrates 4. Each pair of aligned inner capacitor substrates 4 is arranged parallel to the first circuit board 8. The four focusing coils 7 are respectively mounted on the four first circuit boards 8, and can be electrically connected to an external power source through the first circuit boards 8 to obtain power.

[0043] The lower spring 9 comprises two generally semi-circular lower spring bodies, which are mounted on the bottom of the lens base of the lens module 3 and form a ring. The center of the lens base protrudes from the ring formed by the lower spring bodies for outputting optical images. At least two elongated lower connecting ends extend from the outside of each lower spring body for connecting the lower spring 9 to the inner wall of the base 11, thereby fixing the lower spring 2 to the bottom of the base 11. Both the lower spring body and the lower connecting ends of the lower spring 9 are elastic. When the lower spring 9 is assembled with the lens module 3, the lower spring body can use its own elasticity to generate a restoring force to eliminate the offset of the lens module 3 in the Z-axis direction, and the lower connecting ends can use their own elasticity to generate a restoring force to eliminate the offset of the lens module 3 in the X-axis and Y-axis directions. The shape of each lower connecting end is preferably formed as a tortuous shape, such as an S-shape, which helps to improve the stress resistance during deformation and prevent breakage by external forces or internal stress during operation. In this embodiment, the lower spring 9 is made of a conductive material such as a metal material. In addition to providing elastic restoring force, it is also connected to the inner substrate 4 of the capacitor to serve as a power supply circuit for the inner substrate 4 of the capacitor. In this way, the inner substrate 4 of the capacitor can be coupled to the outside world through the upper spring 2 and the lower spring 9.

[0044] The second circuit board 10 is preferably a rectangular flat plate, installed inside the base 11, and preferably positioned parallel to the bottom surface of the lens base. The second circuit board 10 has an OIS coil and a power supply circuit for connecting the OIS coil to an external power source. The OIS coil and its power supply circuit can be etched onto the surface of the second circuit board 10 to reduce size and save space. In this embodiment, the number of OIS coils is preferably four, their positions corresponding to the four magnets 6. When the OIS coil is energized, the energized OIS coil generates an electromagnetic thrust due to electromagnetic induction in the magnetic field of the magnets 6, which provides power for the OIS process.

[0045] The base 11 is generally rectangular box-shaped, having a base plate that is generally square and four base side plates that are generally rectangular. The base plate has a lower lens hole in the center for the lens of the lens module to be exposed. The four base side plates are perpendicularly connected to the base plate along the edge of the same surface, and are joined end-to-end to form a rectangular frame. The internal dimensions of the base 11 are slightly larger than the external dimensions of the lens base, allowing the lens base to fit inside the base 11; the external dimensions of the base 11 are slightly smaller than the internal dimensions of the outer shell 1, allowing the base 11 to fit inside the outer shell 1. In this embodiment, preferably, the second circuit board 10 is fixedly mounted on the inner surface of the base plate, the four focusing coils 7 are embedded inside the four base side plates, and the four first circuit boards 8 are fixedly mounted on the outer surfaces of the four base side plates. As mentioned above, the capacitor outer substrate 5 is preferably integrally formed with the base 11 by means of manufacturing such as injection molding; and the outer substrate pins of each capacitor outer substrate 5 are configured to protrude from the surface of the base plate in order to provide electrical connection for the capacitor outer substrate 5.

[0046] Both the capacitor inner substrate terminals 12 and the anti-shake coil terminals 13 are fixedly mounted on the base 11 using existing techniques such as soldering. Preferably, there are four capacitor inner substrate terminals 12, corresponding one-to-one with the four capacitor inner substrates 4. One end of each capacitor inner substrate terminal 12 is used to connect to the corresponding capacitor inner substrate 4, and the other end is exposed from the surface of the base plate to provide an electrical connection to the corresponding capacitor inner substrate 4, for stabilizing the voltage of the capacitor inner substrate 4 and serving as a multiplexed terminal for closed-loop detection of the capacitor signal. Similarly, there are preferably four anti-shake coil terminals 13, corresponding one-to-one with the four OIS coils on the second circuit board 10. One end of each anti-shake coil terminal 13 is connected to the power supply circuit of the corresponding OIS coil, and the other end is exposed from the surface of the base plate to provide an electrical connection to the corresponding OIS coil.

[0047] When assembling the image stabilization motor, the upper spring 2, lens module 3, inner capacitor substrate 4, magnet 6, and lower spring 9 can be formed into an integrated moving part assembly according to the manufacturing method described above. The outer capacitor substrate 5, focusing coil 7, first circuit board 8, second circuit board 10, base 11, inner capacitor substrate terminal 12, and image stabilization coil terminal 13 can be formed into another integrated stator assembly. Then, the lens base of the lens module 3 is fitted inside the base 11, and each inner capacitor substrate terminal 12 is connected to the corresponding inner capacitor substrate 4. The outer shell 1 is then fitted outside the base 11, and the insertion part of the lens module 3 passes through the upper lens hole opened on the top plate of the outer shell 1. Finally, the upper spring 2, lower spring 9, first circuit board 8, second circuit board 10, inner capacitor substrate terminal 12, and image stabilization coil terminal 13 are all electrically connected to the corresponding external power supply circuit through, for example, conventional electrical connection methods, to provide working power to the image stabilization motor, thus completing the assembly.

[0048] The working principle of the anti-shake motor is explained in detail below.

[0049] According to common knowledge in the field of capacitors, the basic formula for the capacitance C of a parallel plate capacitor is: Where ε is the vacuum permittivity, ε r Let S be the relative permittivity of the dielectric, S be the effective overlapping area of ​​the two capacitor plates, and d be the distance between the two capacitor plates. If the capacitor plates are rectangular with length L and width W, then since their area S = L * W, the above basic formula can be transformed into...

[0050]

[0051] Based on the above principle, the image stabilization motor can detect the movement direction and distance of the lens module 3 in the X, Y and Z axes by changing the relative position of its inner capacitor substrate 4 and outer capacitor substrate 5.

[0052] As previously mentioned, the outer capacitor substrate 5 is integrally formed with the base 11 and remains fixed during operation; while the inner capacitor substrate 4 is integrally formed with the lens housing of the lens module 3 and changes position with the lens module 3 during operation. Please refer to... Figure 4 The image stabilization motor can detect the movement direction and distance of the lens module 3 in the Z-axis direction by changing the capacitance value of any two pairs of capacitor inner and outer substrates that are relatively opposite (i.e., arranged parallel to each other) in the four pairs of capacitor inner and outer substrates. For ease of description, Figure 4 In the example used to implement Z-axis motion closed-loop detection, the inner capacitor substrate 4 of the two pairs of inner and outer capacitor substrates is further labeled as 41 and 42, and the outer capacitor substrate 5 is further labeled as 51 and 52. The inner capacitor substrate 41 and the outer capacitor substrate 51 are parallel to each other and form a first capacitor; the inner capacitor substrate 42 and the outer capacitor substrate 52 are parallel to each other and form a second capacitor.

[0053] like Figure 4 As shown, in the initial state of lens module 3 (i.e. Figure 4 In the state shown in the left figure, the bottoms of the inner capacitor substrates 41 and 42 and the outer capacitor substrates 51 and 52 are relatively flush. To improve the accuracy of Z-axis movement detection, this embodiment employs a different design for the dimensions of the outer capacitor substrates 51 and 52. Specifically, the outer capacitor substrate 51 is designed to completely overlap with the corresponding inner capacitor substrate 41, while the height difference between the top 521 of the outer capacitor substrate 52 and the top of the corresponding inner capacitor substrate 42 is designed to be no less than the rated travel of the lens module 3 in the Z-axis direction. Furthermore, in this embodiment, it is preferable to also adjust the distance between the sides of the outer capacitor substrates 51 and 52 and the sides of the inner capacitor substrates 41 and 42 (e.g., ...). Figure 4 The horizontal distance ΔW between the side of the outer substrate 52 of the capacitor and the side of the inner substrate 42 of the capacitor is designed to be no less than the maximum anti-shake stroke of the anti-shake motor. This can prevent the calculation of the capacitance value from being interfered with by changing the overlapping area of ​​the inner and outer substrates of the capacitor in the X-axis or Y-axis direction when optical image stabilization is achieved in the X-axis and Y-axis directions.

[0054] Please refer to further information. Figure 4 Based on the above structural design, when the lens module 3 moves along the preset positive Z-axis direction (referred to as the Z+ direction) on the Z-axis, in the following way... Figure 4 The figure shows the overlap length (i.e., the length between the inner capacitor substrate 41 and the outer capacitor substrate 51) in the vertical direction, based on the reference. Figure 4 The length of the left grid portion shown in the middle diagram will change relative to the aforementioned initial state, and the capacitance value of the first capacitor formed by the inner capacitor substrate 41 and the outer capacitor substrate 51 will also change accordingly; on the other hand, since the height difference between the top 521 of the outer capacitor substrate 52 and the corresponding top of the inner capacitor substrate 42 is not less than the rated stroke of the lens module 3 in the Z-axis direction, the overlap length of the inner capacitor substrate 42 and the outer capacitor substrate 52 (i.e., Figure 4 The length of the grid portion on the right side of the diagram remains unchanged relative to the initial state, and the capacitance value of the second capacitor formed by the inner capacitor substrate 42 and the outer capacitor substrate 52 remains unchanged. When the lens module 3 moves along the Z-axis in the opposite direction to the positive Z-axis (referred to as the Z-direction), the overlap length of the inner capacitor substrate 41 and the outer capacitor substrate 51, as well as the overlap length of the inner capacitor substrate 42 and the outer capacitor substrate 52, will simultaneously change relative to the initial state (e.g., Figure 4 As shown in the right figure, the lengths of the grid sections on the left and right sides are relative to... Figure 4 (As shown in the left figure, the initial states have all changed), causing changes in the capacitance values ​​of both the first and second capacitors. Based on the above principle, the direction and distance of movement of the lens module 3 along the Z-axis can be determined by the changes in the capacitance values ​​of the first and second capacitors, and further, the specific position of the lens module 3 along the Z-axis can be detected. In some embodiments, a Z-axis response curve can be established based on the correspondence between the capacitance value C of either the first or second capacitor and the displacement L of the lens module 3 along the Z-axis. Based on this Z-axis response curve, the difference between the capacitance value C corresponding to the current position of the lens module 3 and the capacitance value C corresponding to the target displacement value of the lens module 3 along the Z-axis can be used to deduce the magnitude of the input current that needs to be adjusted, thus achieving closed-loop feedback for the movement of the lens module 3 along the Z-axis.

[0055] Please see Figure 5 The image stabilization motor can also detect the movement direction and distance of the lens module 3 in the X and Y axes based on the changes in the first and second capacitors. As can be seen from the above structural design, when the displacement of the lens module 3 in the Z axis direction is determined, the capacitance values ​​of the first and second capacitors are obviously only related to the distance between the inner and outer substrates of the respective capacitors. Figure 5As shown, the initial gaps between the inner capacitor substrate 41 and the outer capacitor substrate 51, and between the inner capacitor substrate 42 and the outer capacitor substrate 52, are both d0. When the lens module 3 moves along a preset positive X-axis or positive Y-axis direction (referred to as X+ or Y+ direction) on the X-axis or Y-axis, the gap d1 between the inner capacitor substrate 41 and the outer capacitor substrate 51 increases, causing the capacitance value of the first capacitor to decrease; while the gap d2 between the inner capacitor substrate 42 and the outer capacitor substrate 42 decreases, causing the capacitance value of the second capacitor to increase. Conversely, when the lens module 3 moves along the X-axis in the opposite direction to the positive X-axis direction (referred to as X- direction), or along the Y-axis in the opposite direction to the positive Y-axis direction (referred to as Y- direction), the opposite occurs. Based on this principle, the direction and distance of movement of the lens module 3 on the X-axis or Y-axis can be determined by the changes in the capacitance values ​​of the first and second capacitors, and further, the specific position of the lens module 3 on the X-axis or Y-axis can be detected. In some embodiments, an X / Y axis response curve can be established based on the correspondence between the capacitance difference ΔC between the first capacitor and the second capacitor and the spacing Δd between the inner and outer substrates of either the first capacitor or the second capacitor. Based on this X / Y axis response curve, as long as the capacitance difference ΔC between the first capacitor and the second capacitor corresponding to the current position of the lens module 3 and the capacitance difference ΔC between the first capacitor and the second capacitor required for OIS compensation of the lens module 3 are obtained, the difference between these two capacitance differences ΔC can be calculated, and the OIS input current that needs to be adjusted can be deduced, so that the movement of the lens module 3 in the X / Y axis direction can achieve closed-loop feedback.

[0056] It should also be noted that, based on existing technology in this field, during the manufacturing process of the image stabilization motor and lens module 3, the sensitivity of the image stabilization motor and the capacitance values ​​of the four capacitors formed by the inner and outer substrates of the four pairs of capacitors when the lens module moves along the Z-axis can be determined by a programming station. The magnitude of the current driving the image stabilization motor can be controlled by existing chips, and the initial capacitance values ​​of the four capacitors when the lens module 3 has no displacement in the X / Y-axis directions can be directly calculated by the control chip. For any one of the four capacitors, the distance between its inner and outer substrates can be calculated by the difference between its actual measured current capacitance value and its initial capacitance value.

[0057] On the other hand, the image stabilization motor can be used to drive the lens module 3 to move along the Z-axis to achieve autofocus (AF). The working principle of the image stabilization motor driving the lens module 3 to achieve AF operation is explained below.

[0058] As previously described, the upper spring 2, lens module 3, inner capacitor substrate 4, magnet 6, and lower spring 9 of the image stabilization motor form an integrated moving part assembly, while the outer capacitor substrate 5, focusing coil 7, first circuit board 8, second circuit board 10, base 11, inner capacitor substrate terminal 12, and image stabilization coil terminal 13 form another integrated assembly. In the stator assembly, the integrated outer capacitor substrate 5, base 11, and first circuit board 8 serve as the AF portion of the stator assembly of the image stabilization motor for AF operation, such as... Figure 6 As shown, an external power source can provide operating current to the focusing coil 7 through terminals 81 provided on the first circuit board 8. In some embodiments, the number of terminals 81 and the number of focusing coils 7 can be increased or decreased according to actual needs. The actuator assembly can be used as a whole for AF operation. The actuator assembly is also integrally formed with the lens module 3 (in other embodiments, they can be manufactured separately and then fixed together) to drive the lens module 3, such as... Figure 7 As shown. As mentioned earlier, the upper spring 2 and the lower spring 9 are both divided into two roughly semi-circular spring bodies, which can be used as the input circuits of the four capacitor inner substrates 4 respectively.

[0059] Please refer to the following: Figure 8 In this embodiment, each magnet 6 consists of two sub-magnets arranged side-by-side and attached together, with the magnetic poles of the two sub-magnets staggered, such as... Figure 8 As shown, magnetic poles 61 and 63 in magnet 6 are the S poles of the two sub-magnets, and magnetic poles 62 and 64 are the N poles of the two sub-magnets. In the Z-axis direction, that is, the direction in which the moving component drives the lens module 3 to perform AF operation, the boundary lines between magnetic poles 61 and 62, and between magnetic poles 63 and 64, are set to align with the interior of the focusing coil 7, as shown. Figure 8 As shown, the N pole 62 and S pole 63 of the magnetic poles are on top, and the S pole 61 and N pole 64 are on the bottom; the direction of the magnetic field lines is from the N pole to the S pole. When the focusing coil 7 opposite each magnet 6 is energized, since the focusing coil 7 is wound in the same direction, when the current input to the upper coil winding is inward, the current input to the lower coil winding is outward.

[0060] Based on the stator and mover structure design described above, the image stabilization motor can use the electromagnetic thrust generated by the principle of electromagnetic induction to drive the mover assembly to move the lens module 3 along the Z-axis for AF operation. According to Ampere's law, the electromagnetic thrust F generated by the principle of electromagnetic induction... 安 = N * BIL, where N is the number of turns in the coil, B is the magnetic field strength, I is the current in the coil, and L is the effective length of the coil. Based on the above principle, please refer to... Figure 9When the image stabilization motor is powered on, according to the left-hand rule, when terminal 81 of the first circuit board 8 supplies power to the focusing coil 7, the upper and lower sections 71 and 72 of the focusing coil 7 generate a downward Ampere force (because the magnetic fields of the two sections of the coil are in opposite directions, and the currents within them are also in opposite directions, the two cancel each other out, producing a same-direction Ampere force). Since the focusing coil 7 is a stator assembly, the Ampere force it generates will produce a reaction force of opposite direction and equal magnitude on the magnet 6. This reaction force serves as the focusing driving force for the image stabilization motor, pushing the moving assembly containing the magnet 6 and the integrated lens module 3 upward, that is, moving along the Z+ direction. Following the same principle, changing the direction of the current flowing into the focusing coil 7 will generate a focusing driving force in the opposite direction, pushing the moving assembly and the lens module 3 to move in the Z- direction. This achieves the driving of the lens module 3 to perform AF operation.

[0061] Also note that when the anti-shake motor design is finalized, the values ​​of the parameters N, B, and L are also determined. At this point, the greater the current, the greater the generated Ampere force. For example... Figure 10 As shown, when the end face of lens module 3 is facing upwards, the magnitude of the force it currently experiences is:

[0062] F 安 (motor) = F 弹 (Attaching the spring) + F 弹 (Lower shrapnel) + G (moving element)

[0063] Where F 弹 Let F represent the elastic force generated by the deformation of the upper and lower spring pieces, and G represent gravity. From the above formula, it can be seen that when G (the mover) is a fixed value, as F... 安 As the length increases, the upper and lower springs will deform to provide F. 弹 Used with F 安 Balance, allowing lens module 3 to reach a stable equilibrium state. F 安 The larger the magnet, the greater the driving force provided to the lens module 3 during AF operation, resulting in faster and more accurate AF operation. While conventional image stabilization motors can also use four magnets, they typically only provide four effective focusing coil segments, generating relatively small ampere forces. In this embodiment, however, each of the four focusing coils 7 has two effective segments capable of generating ampere forces. This means that with the same four magnets, the driving force that the image stabilization motor can provide to the lens module 3 during AF is doubled.

[0064] On the other hand, the image stabilization motor can be used to drive the lens module 3 to move along the X-axis or Y-axis to achieve optical image stabilization (OIS). The working principle of the image stabilization motor driving the lens module 3 to achieve OIS operation is explained below.

[0065] Please see Figure 11In the aforementioned stator assembly, the integrated capacitor outer substrate 5, the second circuit board 10, and the base 11 serve as the OIS (Optical Image Switching) portion of the stator assembly for the anti-shake motor, used for OIS operation. The four OIS coils on the second circuit board 10 can obtain power from the outside through the anti-shake coil terminals 13. The aforementioned mover assembly, including the integrated upper spring 2, capacitor inner substrate 4, magnet 6, and lower spring 9, can be used entirely for OIS operation. The magnet 6 is used to provide a magnetic field to the OIS coils.

[0066] Based on the stator and mover structure design described above, the image stabilization motor can use electromagnetic thrust generated by electromagnetic induction to drive the mover assembly to move the lens module 3 along the X and Y axes for OIS operation. Please refer to... Figure 12 In the X-axis or Y-axis direction, that is, in the direction in which the moving component drives the lens module 3 to perform OIS operation, the boundary lines between magnetic poles 61 and 64 of each magnet 6, and between magnetic poles 62 and 63, are set to align with the interior of the corresponding OIS coil. Taking the region 101 of the OIS coil on the left side of the figure as an example, when a counterclockwise current is passed through the OIS coil, the part of the OIS coil below magnetic pole 61 will experience a rightward Ampere force in the magnetic field according to the left-hand rule. Similarly, the coil below magnetic pole 64 will also experience a rightward Ampere force (because the magnetic fields of the two coils are in opposite directions, and the currents in them are also in opposite directions, so they cancel each other out and produce a same-direction Ampere force). Since the OIS coil is etched onto the second circuit board 10, which remains stationary, the generated Ampere force produces a counterforce of equal magnitude and opposite direction to the magnet 6 above the OIS coil. This counterforce serves as the stabilization driving force for the image stabilization motor, pushing the moving assembly containing the magnet 6 and the integrated lens module 3 to move to the left, i.e., along the X- direction. Following the same principle, changing the direction of the current flowing through the OIS coil generates a stabilization driving force that pushes the moving assembly and lens module 3 to move in the X+ direction. Similarly, controlling other OIS coils according to the same principle can generate corresponding stabilization driving forces, respectively pushing the moving assembly and lens module 3 to move in the X and Y axes. This allows control of the lens module 3's movement in the X and Y axes, enabling OIS operation.

[0067] Another embodiment of the present invention provides a camera device, including a lens module (e.g., the lens module 3 described above) and a stabilization motor as described in the above embodiment, the stabilization motor being used to drive the lens module.

[0068] The image stabilization motor and corresponding camera equipment provided in the above embodiments can achieve many beneficial effects compared with the prior art when driving the lens module. For example: (1) By measuring the capacitance signal changes of multiple capacitors composed of multiple sets of parallel capacitor substrates, the movement direction, movement distance and specific position of the lens module driven by the image stabilization motor in three dimensions can be accurately detected, solving the problem in the prior art that it is difficult to determine the specific position and shaking direction of the lens module based solely on the capacitance value between the stator electrode plate and the mover electrode plate. (2) The inner and outer substrates of the capacitor are integrally formed with the image stabilization motor base and the lens module, respectively, forming an integrated stator assembly and mover assembly. This not only reduces the structural size, but also reduces the assembly process of the image stabilization motor to a large extent by using an integral manufacturing method. (3) The upper and lower springs use a four-corner connection structure, and the connection end adopts a zigzag structure design, such as an S-shaped design, which can replace the relatively complex suspension wire and ball bearing mechanism commonly used in existing image stabilization motors, and can prevent the springs from breaking during the OIS process. (4) The magnet used to provide the magnetic field is also integrally formed with the lens module, and the upper and lower springs are connected to the base. Compared with the suspension wire type OIS mechanism commonly used in existing image stabilization motors, the independent magnet carrier and suspension wire are eliminated. Compared with the ball bearing type OIS mechanism commonly used in existing image stabilization motors, the independent AF mechanism carrier, ball bearings and their guide rails are eliminated, which can effectively simplify the structure and reduce costs.

[0069] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A dolly motor for driving a lens module, characterized by, The anti-shake motor comprises a stator assembly and a mover assembly movable relative to the stator assembly, the mover assembly is integrally formed with or fixed with the lens module; the stator assembly comprises a base and a capacitor outer substrate, a first circuit board and a second circuit board arranged on the base, the first circuit board is provided with a focusing coil, and the second circuit board is provided with an optical anti-shake coil; the mover assembly comprises a capacitor inner substrate and a magnet; the capacitor formed by the capacitor outer substrate and the capacitor inner substrate is used to determine the moving direction and distance of the mover assembly relative to the stator assembly; the focusing coil and the magnet are used to generate a focusing driving force for driving the mover assembly to focus; and the optical anti-shake coil and the magnet are used to generate an anti-shake driving force for driving the mover assembly to perform optical anti-shake; The capacitor outer substrate and the capacitor inner substrate are both multiple and one-to-one corresponding, each capacitor inner substrate and the corresponding capacitor outer substrate are arranged in parallel relative to each other, and the size of at least two capacitor outer substrates is configured as: One of the capacitor outer substrates and the corresponding capacitor inner substrate completely overlap in the direction parallel to the optical axis of the lens module, and the top of another capacitor outer substrate and the top of the corresponding capacitor inner substrate have a height difference of not less than the rated stroke of the mover assembly; The capacitance of the capacitor formed by the at least two capacitor outer substrates and the corresponding capacitor inner substrates varies, and is used to jointly determine the moving direction and distance of the mover assembly relative to the stator assembly.

2. The anti-shake motor according to claim 1, wherein The capacitor outer substrate is integrally formed with the base, and the capacitor inner substrate and the magnet are integrally formed with the lens module.

3. The anti-shake motor according to claim 1, wherein The magnet is composed of two sub-magnets arranged side by side, and the magnetic poles of the two sub-magnets are staggered; in the moving direction of the mover assembly for focusing, the boundary line between the magnetic poles of the sub-magnets is arranged to align the inside of the focusing coil; in the moving direction of the mover assembly for optical anti-shake, the boundary line between the magnetic poles of the sub-magnets is arranged to align the inside of the optical anti-shake coil.

4. The anti-shake motor according to claim 1, wherein The mover assembly further comprises an upper spring plate, the upper spring plate comprises an upper spring plate body arranged outside the lens module, an upper connecting end with a meandering shape is extended outside the upper spring plate body, and the upper connecting end is used to connect with the base; the upper spring plate body and the upper connecting end both have elasticity.

5. The anti-shake motor according to claim 4, wherein The mover assembly further comprises a lower spring plate, the lower spring plate comprises a lower spring plate body arranged at the bottom of the lens module, a lower connecting end with a meandering shape is extended outside the lower spring plate body, and the lower connecting end is used to connect with the base; the lower spring plate body and the lower connecting end both have elasticity.

6. The anti-shake motor according to claim 5, wherein The upper spring plate and the lower spring plate are both made of conductive material and connected with the capacitor inner substrate, so that the capacitor inner substrate is coupled through the upper spring plate and the lower spring plate.

7. The anti-shake motor according to claim 1, wherein The stator assembly further comprises a capacitor inner substrate terminal for electrically connecting the capacitor inner substrate with an external electric device and an optical anti-shake coil terminal for electrically connecting the optical anti-shake coil with an external electric device, both of which are arranged on the base.

8. The anti-shake motor according to claim 1, wherein The optical anti-shake coil is formed on the surface of the second circuit board by etching.

9. An image pickup apparatus characterized by comprising: The lens module comprises a lens module and an anti-shake motor as claimed in any one of claims 1-8, the anti-shake motor being used to drive the lens module.

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