JP7583168B2 - Lens drive unit - Google Patents

Description

The present invention relates to a drive device, and in particular to a lens drive device.

As imaging technology advances, lens drivers are widely used in various imaging devices. The combination of lens drivers with various portable electronic devices such as mobile phones, video cameras, and computers is popular among consumers.

In the prior art, the driving mechanism of the lens driving device is usually a driving structure consisting of a coil and a magnet steel, in which a support frame is supported on a base, a driving coil and a driving magnet steel are fixed to a lens barrel holder and a support frame, respectively, and the lens barrel holder is supported on the support frame via an upper elastic sheet. The OIS coil (image stabilization coil) is fixed to a case and located above the support frame, and the image stabilization magnet steel is fixed to the side of the support frame away from the base, and a damping rubber is added between the support frame and the lens barrel holder to be used for image stabilization of the lens barrel. When a current is applied to the driving coil, the driving coil and the driving magnet steel generate an electromagnetic field, and the driving coil is subjected to the action of the Lorentz force of the electromagnetic field to drive the driving magnet steel to move along the optical axis direction of the lens barrel, so that the lens barrel moves along the optical axis direction. When a current is applied to the image stabilization coil, an electromagnetic field is generated in the image stabilization coil and the image stabilization magnet steel, and the image stabilization coil is subjected to the Lorentz force of the electromagnetic field, driving the image stabilization magnet steel to move in a direction perpendicular to the optical axis, utilizing the cushioning effect of the damping rubber to achieve the OIS image stabilization performance of the lens barrel.

However, in the conventional technology, the addition of a damping rubber between the lens barrel holder and the support frame in the lens drive device makes it difficult to control the position of the adhesive amount, and there are concerns that it may become unstable due to the influence of stroke and lose reliability. The damping rubber is located in the gap between the support frame and the lens barrel holder and is in a suspension position. During the normal focusing or dropping process of the lens barrel in the lens barrel holder, the stroke of up and down movement is large, and the position and shape of the damping rubber are pulled according to the movement of the lens barrel holder, resulting in the risk of breakage or displacement. In addition, if the gap between the support frame and the lens barrel holder is misaligned, the adhesive amount and consistency will be poor, and production costs will increase.

Therefore, it is necessary to provide a new lens driving device to solve the above problems.

The technical problem that this invention aims to solve is to provide a lens drive device that is small, easy to assemble, has good stability, and can reduce manufacturing costs.

In order to solve the above technical problems, the present invention provides a lens driving device, which includes a base, a support frame having an accommodation space and supported by the base, a lens barrel holder that is accommodated in the accommodation space and used to attach a lens barrel having an optical axis, and an elastic assembly that is fixed to both opposing sides of the support frame in the optical axis direction and elastically supports the lens barrel holder in the accommodation space, the elastic assembly including a first fixed arm fixed to the support frame, a second fixed arm fixed to the lens barrel holder, and a plurality of elastic arms connecting the first fixed arm and the second fixed arm, the elastic arms are installed at intervals from the support frame along the optical axis direction, and each of the elastic arms approaches the lens barrel holder from the first fixed arm. The lens driving device includes a first elastic bending portion that bends and extends in a direction away from the lens barrel holder, and a plurality of second elastic bending portions that bend and extend from the first elastic bending portion in a direction toward the lens barrel holder and are connected to the second fixed arm, the radius of curvature of the first elastic bending portion is greater than the radius of curvature of the second elastic bending portion, the lens driving device further includes a plurality of damping rubbers, each of which is provided between the first elastic bending portion and the support frame, a fixing structure for fixing the damping rubber is formed on the surface of the support frame corresponding to the first elastic bending portion in the optical axis direction, the fixing structure protruding toward the first elastic bending portion, and the first elastic bending portion and the fixing structure are fixedly connected by the damping rubber, and the damping rubber at least partially covers the first elastic bending portion.

Preferably, the elastic assembly includes an upper elastic sheet fixed to the side of the support frame away from the base and a lower elastic sheet fixed to the side of the support frame closer to the base, and the damping rubber is provided between the upper elastic sheet and the support frame.

Preferably, the support frame is rectangular, the fixing structures include four, and are located at the four corners of the support frame, the upper elastic sheets include two, and are installed opposite each other with a gap between them, each upper elastic sheet includes two elastic arms spaced apart from each other, and the four first elastic bending portions correspond one-to-one to the four fixing structures, respectively.

Preferably, the support frame is recessed from the support frame toward the surface of the elastic arm in the direction of the optical axis away from the elastic arm, and has a main body plastic surface that is spaced apart from the elastic arm, and the fixing structure has a protrusion that protrudes from the side of the main body plastic surface closer to the elastic arm and extends toward the arm, the protrusion is spaced apart from the first elastic bending portion, and the damping rubber is in close contact with the protrusion.

Preferably, the protrusion has an annular structure and the damping rubber is partially embedded within the annular region of the protrusion.

Preferably, the fixing structure further includes a rubber groove recessed from the main body plastic surface in a direction away from the elastic assembly, the rubber groove being located within an area surrounded by the protrusion, and the damping rubber being at least partially disposed within the rubber groove.

Preferably, the inner diameter of the protrusion gradually increases from the end closest to the rubber groove to the end farther from the rubber groove.

Preferably, the damping rubber completely covers the first elastic bending portion.

Preferably, the lens driving device further includes a case that is provided to cover the base and surrounds the base to form a storage space together with the base, and a suspension wire that movably supports the support frame within the storage space, one end of the suspension wire being connected to the base and the other end being connected to the elastic assembly.

Preferably, the lens driving device further includes an image stabilization coil fixed to the base, a magnetic steel fixed to the support frame and facing and spaced apart from the image stabilization coil, and an autofocus coil fixed to the lens barrel holder and spaced apart from the magnetic steel, the image stabilization coil working in conjunction with the magnetic steel to drive the support frame to move along a direction perpendicular to the optical axis, and the autofocus coil working in conjunction with the magnetic steel to drive the lens barrel holder to move along the optical axis direction.

Compared with the conventional technology, in the lens driving device of the present invention, each elastic arm includes a first elastic bending portion that bends and extends from the first fixed arm in a direction approaching the lens barrel holder, and a plurality of second elastic bending portions that bend and extend from the first elastic bending portion in a direction approaching the lens barrel and are connected to the second fixed arm, the radius of curvature of the first elastic bending portion is larger than the radius of curvature of the second elastic bending portion, each of the first elastic bending portions is installed correspondingly above one of the fixed structures and forms a gap with the corresponding fixed structure. The lens driving device further includes a plurality of damping rubbers, each of which is provided between the first elastic bending portion and the support frame. A fixing structure for fixing the damping rubber is formed on the surface of the support frame corresponding to the first elastic bending portion in the optical axis direction so as to protrude toward the first elastic bending portion, and the first elastic bending portion and the fixed structure are fixedly connected by the damping rubber, where the damping rubber at least partially covers the first elastic bending portion. In the above structure, the lens barrel holder has a large vertical movement stroke during normal focusing or dropping, but since the damping rubber is located on the side of the elastic sheet closer to the support frame in the optical axis direction, the first elastic bent part of the elastic assembly moves up and down less, and the damping rubber is not affected by the large pulling state that occurs in the conventional method, and is more stable. When the X/Y direction image stabilization operation or X/Y direction drop occurs, the lens barrel holder and the support frame move relatively closer or farther away, but since the damping rubber is not located between them, the degree of influence is small, and only the bent part with a large curvature moves slightly, making the shape of the lens barrel holder more stable, improving the image stabilization effect, and significantly reducing production costs.

In order to more clearly describe the technical ideas in the embodiments of the present invention, the drawings necessary for describing the embodiments are briefly described below. Obviously, the following description of the drawings is only for describing some embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without creative efforts.
FIG. 1 is a perspective view of a lens driving device according to the present invention. FIG. 2 is a diagram showing an exploded view of a part of the lens driving device of the present invention. FIG. 3 is an exploded view showing the overall structure of the lens driving device of the present invention. FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 5 is a cross-sectional view taken along line BB of FIG. FIG. 6 is an enlarged view of part C in FIG. FIG. 7 is a diagram showing the structure of a portion of the elastic assembly of the present invention. FIG. 8 is a diagram showing the structure of the support frame of the present invention. FIG. 9 is a graph showing wave number response characteristics of the lens driving device of the present invention. FIG. 10 is a graph showing the wave number response characteristics of a lens driving device of the prior art.

The technical ideas in the embodiments of the present invention will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that a person skilled in the art can obtain without making any inventive efforts are all included in the scope of protection of the present invention.

As shown in Figures 1 to 10, a lens driving device 100 is provided that includes a base 1, a support frame 2, a lens barrel holder 4, an elastic assembly 5, and a flexible printed circuit board 11.

The support frame 2 has a storage space 13, and the support frame 2 is supported by the base 1.

The case 3 is arranged to cover the base 1, and the support frame 2 is located within the case 3.

The lens barrel holder 4 is housed within the housing space 13 and is used to attach the lens group.

The elastic assembly 5 includes a first fixed arm 51 fixed to the support frame 2, a second fixed arm 54 fixed to the lens barrel holder 4, and a plurality of elastic arms 14 connecting the first fixed arm 51 and the second fixed arm 54, and the elastic arms 14 are installed at intervals from the support frame 2 along the optical axis direction. The first fixed arm 51 is fixed to the support frame 2, the second fixed arm 54 is fixed to the tip of the lens barrel holder 4, and a connection is formed between the lens barrel holder 4 and the support frame 2 by the elasticity of the plurality of elastic arms 14, thereby elastically supporting the lens barrel holder 4 within the accommodation space 13. In this embodiment, each of the elastic arms 14 includes a first elastic bending portion 52 that bends and extends from the first fixed arm 51 in a direction approaching the lens barrel holder 4, and a plurality of second elastic bending portions 53 that bend and extend from the first elastic bending portion 52 in a direction approaching the lens barrel holder 4 and are connected to the second fixed arm 54, and the radius of curvature of the first elastic bending portion 52 is greater than the radius of curvature of the second elastic bending portion 53. The first elastic bending portion 52 is provided close to the support frame 2 and is mainly used to bear the main deformation effect when the lens barrel holder 4 is twisted or when a relative translation form occurs in the support frame 2. The plurality of second elastic bending portions 53 are provided close to the lens barrel holder 4 and are mainly used to balance performance design and stress action, and are not responsible for deformation. As a result, the lens barrel holder 4 uses a combination of the first elastic bending portion 52 and multiple second elastic bending portions 53 under the action of the elastic assembly 5, which prevents the lens barrel holder 4 from twisting or moving in parallel, and is advantageous in improving the image stabilization performance of the lens driving device 100.

The lens driving device 100 further includes a plurality of damping rubbers 12, each of which is provided between the first elastic bending portion 52 and the support frame 2, and a fixing structure 21 for fixing the damping rubber 12 is formed on the surface of the support frame 2 corresponding to the first elastic bending portion 52 in the optical axis direction, protruding toward the first elastic bending portion 52, and the first elastic bending portion 52 and the fixing structure 21 are fixedly connected by the damping rubber 12, where the damping rubber 12 at least partially covers the first elastic bending portion 52. The lens barrel holder 4 has a large vertical movement stroke during normal focusing or dropping, but since the damping rubber 12 is located on the side of the elastic sheet closer to the support frame 2 in the optical axis direction, the vertical movement amount of the first elastic bending portion 52 of the elastic assembly 5 is small, and the damping rubber 12 is not affected by the large pulling state generated in the conventional method, and is more stable. When an X/Y-direction camera shake correction operation or a fall in the X/Y direction occurs, the lens barrel holder 4 and the support frame 2 move relatively closer or farther apart, but because the damping rubber 12 is not located between them, the degree of influence is small, and only the bent part with a large curvature moves slightly, making the shape of the lens barrel holder 4 more stable, improving the camera shake correction effect, and significantly reducing production costs.

Each of the first elastic bending portions 52 is installed above one of the fixed structures 21 and forms a gap with the corresponding fixed structure 21.

In this embodiment, the elastic assembly 5 includes an upper elastic sheet 15 fixed to the side of the support frame 2 away from the base 1, and a lower elastic sheet fixed to the side of the support frame 2 closer to the base 1. The damping rubber 12 is provided between the upper elastic sheet 15/lower elastic sheet and the support frame 2.

One end of the upper elastic sheet 15 is fixed to the tip of the support frame 2 along the optical axis direction of the lens barrel holder 4, and the other end of the upper elastic sheet 15 is fixed to the tip of the lens barrel holder 4 along the optical axis direction, thereby elastically suspending the lens barrel holder 4 within the accommodation space 13. In this embodiment, the upper elastic sheet 15 is provided with a conductive path for realizing the transmission of electrical signals. For example, if the upper elastic sheet 15 is an FPC, the conductive path is the realization of a conductive circuit on the FPC.

One end of the lower elastic sheet is fixed to the bottom of the support frame 2 along the optical axis direction, and the other end of the lower elastic sheet is fixed to the bottom of the lens barrel holder 4 along the optical axis direction. The upper elastic sheet 15 and the lower elastic sheet together elastically support the lens barrel holder 4 within the accommodation space 13 and are used to provide a restoring force to the lens barrel holder 4 during the autofocus (AF) function.

In this embodiment, the lens driving device 100 further includes a case 3 that is provided to cover the base 1 and surrounds the base 1 to form a storage space together with the base 1, and a suspension wire 7 that movably supports the support frame 2 within the storage space, one end of the suspension wire 7 being connected to the base 1 and the other end being connected to the elastic assembly 5. Here, the suspension wire 7 is made up of four wires that are evenly distributed at the four corners of the support frame 2 and are used to movably suspend the support frame in the space surrounded by the case and base.

In this embodiment, the lens driving device 100 further includes an image stabilization coil 9 fixed to the base 1, a magnet steel 10 fixed to the support frame 2 and facing and spaced apart from the image stabilization coil 9, and an autofocus coil 8 fixed to the lens barrel holder 4 and spaced apart from the magnet steel 10, and the image stabilization coil 9 cooperates with the magnet steel 10 to drive the support frame 2 to move along a direction perpendicular to the optical axis. The autofocus coil 8 cooperates with the magnet steel 10 to drive the lens barrel holder 4 to move along the optical axis direction.

Here, the lens barrel holder 4, upper elastic sheet 15, lower elastic sheet, suspension wire 7, autofocus coil 8, image stabilization coil 9, magnetic steel 10, and flexible printed circuit board 11 are all housed within the case 3.

The suspension wires 7 are made of a metallic conductive material and are provided in a plurality of wires, each of which is spaced apart to surround the support frame 2. One end of each suspension wire 7 is fixed to the base 1, and the other end is fixed to the upper elastic sheet 15 to form an electrical connection. The suspension wires 7 are used to provide a restoring force to the support frame 2 during the image stabilization function.

The image stabilization coil 9 is fixed to the base 1, the magnet steel 10 is fixed to the side of the support frame 2 closer to the lens barrel holder 4, and the image stabilization coil 9 is located within the magnetic field range of the magnet steel 10 and drives the magnet steel 10 to move along a direction perpendicular to the optical axis.

The magnet steel 10 includes a first driving magnet steel 101 fixed to each of the opposing sides of the support frame 2 along a direction perpendicular to the optical axis, and a second driving magnet steel 102 fixed to each of the other opposing sides of the support frame 2, and each magnet steel 10 is monopolar magnetized. A single magnetic pole is provided on each of the opposing sides of the magnet steel 10.

The autofocus coil 8 is fitted and fixed to the outer periphery of the lens barrel holder 4 and is spaced apart from the magnet steel 10. The autofocus coil 8 is electrically connected to the upper elastic sheet 15. The magnetization direction of the magnet steel 10 is parallel to the winding plane of the autofocus coil 8, and the autofocus coil 8 is driven to move along the optical axis direction (Z-axis direction). The autofocus coil 8 drives the lens barrel holder 4 to move along the optical axis direction, thereby realizing an autofocus (AF) function. In this embodiment, the magnetization direction of the magnet steel 10 is parallel to the winding plane of the autofocus coil 8.

Of course, the magnetization direction of each magnet steel may be perpendicular to the optical axis direction.

The image stabilization coil 9 includes a first image stabilization coil 91 fixed to the base 1 and facing the first driving magnet steel 101 at a distance along a direction parallel to the optical axis, and a second image stabilization coil 92 fixed to the base 1 and facing the second driving magnet steel 102 at a distance along a direction parallel to the optical axis, the first image stabilization coil 91 is located within the magnetic field range of the first driving magnet steel 101 and drives the first driving magnet steel 101 to move along a first direction perpendicular to the optical axis direction, and the second image stabilization coil 92 is located within the magnetic field range of the second driving magnet steel 102 and drives the second driving magnet steel 102 to move along a second direction perpendicular to the optical axis direction. Here, the first direction and the second direction are perpendicular to each other, and in this embodiment, the first direction is the X-axis direction and the second direction is the Y-axis direction. That is, the first image stabilization coil 91 and the second image stabilization coil 92 are spaced apart from each other and arranged around the support frame 2 along the radial direction of the lens barrel holder 4. This configuration ensures that the image stabilization coil 9 does not occupy space in the optical axis direction (Z-axis direction) of the lens drive device 100, effectively reducing the thickness of the lens drive device 100 in the optical axis direction, helping to meet the need for thinner products while also simplifying the assembly method and improving assembly efficiency.

Here, the image stabilization coil 9 is formed by winding in advance, and the plane in which the winding direction of the image stabilization coil 9 is located is perpendicular to the optical axis direction. The image stabilization drive method using this structure can significantly reduce costs compared to the image stabilization drive method using the multilayer circuit board 11 structure of the prior art.

In this embodiment, the flexible printed circuit board 11 is electrically connected to the autofocus coil 8 and the image stabilization coil 9.

The flexible printed circuit board 11 is also provided with a pin portion 111 to facilitate connecting external signal lines.

The support frame 2 further includes a first mounting groove 23 and a second mounting groove 24 formed by recessing from both opposing sides of the support frame 2 away from the lens barrel holder 4, and the first driving magnet steel 101 is provided in the first mounting groove 23, and the second driving magnet steel 102 is provided in the second mounting groove 24. The support frame 2 is used to support and fix the upper elastic sheet 15 and the lower elastic sheet, and the first mounting groove 23 and the second mounting groove 24 are used to mount the first driving magnet steel 101 and the second driving magnet steel 102, respectively, thereby saving the mounting space of the first driving magnet steel 101 and the second driving magnet steel 102 in the lens driving device 100 and miniaturizing the entire structure of the lens driving device 100.

In this embodiment, the support frame 2 is rectangular, the fixing structures 21 include four, and are located at the four corners of the support frame 2, and the upper elastic sheets 15 include two, which are installed opposite each other with a gap between them, and each upper elastic sheet 15 includes two elastic arms 14 spaced apart from each other. The four first elastic bending portions 52 correspond one-to-one to the four fixing structures 21, respectively. This helps the upper elastic sheet 15 to be fixed to the fixing structures 21 via the damping rubber 12, which can enhance the fixing effect of the telescope holder 4, making the telescope holder 4 more stable.

In this embodiment, the two elastic sheets 15 are insulated from each other and surround each other to form a ring shape, and each upper elastic sheet 15 forms one conductive path, realizing the transmission of both positive and negative poles of an electrical signal. In this embodiment, the two upper elastic sheets 15 are installed symmetrically with respect to the tube holder 4. Of course, the two upper elastic sheets 15 may be of an integral structure, and it is sufficient to simply insulate the two conductive paths from each other. This is something that a person skilled in the art could easily have conceived.

In this embodiment, the support frame 2 is provided with a main body plastic surface 22 that is recessed from the support frame 2 toward the surface of the elastic arm 14 in the direction away from the elastic arm 14 along the optical axis direction and is installed at a distance from the elastic arm 14, and the fixing structure 21 is provided with a protrusion 211 that protrudes and extends from the side of the main body plastic surface 22 close to the elastic arm 14 toward the arm 14, the protrusion 211 is installed opposite the first elastic bending portion 52 at a distance, and the damping rubber 12 is closely attached to the protrusion 211. By closely fixing the damping rubber 12 to the main body plastic surface 22, a fixed connection is made between the support frame 2 and the upper elastic sheet 15 of the elastic assembly 5. By providing a fixing structure 21 that accommodates the damping rubber 12 at a corresponding position of the support frame 2, a certain gap for connecting the damping rubber 12 to the upper elastic sheet 15 in the height direction is reserved in advance, and it is ensured that the upper elastic sheet 15 does not interfere with the support frame 2 when the mechanism moves. A protrusion 211 higher than the main body plastic surface 22 is provided on the outer periphery of the damping rubber 12 position of the support frame 2, and there is a step between it and the surrounding structure, which maintains the shape of the damping rubber 12 and prevents it from slipping along the external plane when pressed, making it more stable.

Optionally, the protrusion 211 has an annular structure, and the damping rubber 12 is partially embedded within the annular region of the protrusion 211. The protrusion 211 may be a complete annular structure, may have an opening in the complete annular structure, or may be an annular structure surrounded by multiple protrusions at intervals.

In this embodiment, the fixing structure 21 further includes a rubber groove 212 formed by being recessed from the main body plastic surface 22 in a direction away from the elastic assembly 5, the rubber groove 212 being located within an area surrounded by the protrusions 211, and the damping rubber 12 being at least partially provided within the rubber groove 212. By providing the rubber groove 212 in the main body plastic surface 22 and injecting the damping rubber 12 into the rubber groove 212, the fixing effect between the damping rubber 12 and the support frame 2 can be improved. Preferably, the main body plastic surface 22 is recessed in a direction away from the upper elastic sheet 15 to form the rubber groove 212.

Specifically, the inner diameter of the protrusion 211 gradually increases from the end close to the rubber groove 212 to the end farther from the rubber groove 212. This helps to increase the fixing area between the damping rubber 12 and the fixing structure 21, and provides a good fixing effect.

In this embodiment, the rubber groove 212 is circular or rectangular. It is easy to mold into a circular or rectangular shape, and it can stably bear force and has a high fixing effect.

Of course, the rubber groove 212 is not limited to the above specific shapes (circle, square, etc.) and may be a triangle, parallelogram, etc. As long as there is a step between the main body plastic surface 22 and the protrusion 211, providing an opening in part of the rubber groove 212 also falls within the scope of protection of the present invention.

In this embodiment, the damping rubber 12 completely covers the first elastic bending portion 52, so that the fixing effect between the first elastic bending portion 52 and the support frame 2 is good, the elastic effect of the upper elastic sheet 15 is higher, and the image stabilization effect is higher. Although it is optional, the damping rubber 12 can provide a good fixing effect and save costs by at least partially covering the main body or the entirety of the first elastic bending portion 52.

In this embodiment, the lower elastic sheet 6 includes a third fixed arm 61 fixed to the lower part of the support frame 2, a fourth fixed arm 63 that fixes the bottom of the telescope holder 4, a third elastic bending part 62 that connects the third fixed arm 61 and the fourth fixed arm 63, and a fixing ring 64 fixed to the end of the fourth fixed arm 63, and the fourth fixed arm 63 is fixedly connected to the bottom of the telescope holder 4. This can increase the support stability of the telescope holder.

In this embodiment, the fixing ring 64 has a circular structure.

In this embodiment, as shown in Figures 9 and 10, it has been demonstrated that the lens driving device 100 can effectively achieve the target frequency response characteristics of the OIS motor, and the resonance point amplitude peak is significantly suppressed within 1 KHz, satisfying the closed-loop debugging requirements and image stabilization effect.

Compared with the conventional technology, in the lens driving device of the present invention, each elastic arm includes a first elastic bending portion that bends and extends from the first fixed arm in a direction approaching the lens barrel holder, and a plurality of second elastic bending portions that bend and extend from the first elastic bending portion in a direction approaching the lens barrel and are connected to the second fixed arm, the radius of curvature of the first elastic bending portion is larger than the radius of curvature of the second elastic bending portion, each of the first elastic bending portions is installed correspondingly above one of the fixed structures and forms a gap with the corresponding fixed structure. The lens driving device further includes a plurality of damping rubbers, each of which is provided between the first elastic bending portion and the support frame. A fixing structure for fixing the damping rubber is formed on the surface of the support frame corresponding to the first elastic bending portion in the optical axis direction so as to protrude toward the first elastic bending portion, and the first elastic bending portion and the fixed structure are fixedly connected by the damping rubber, where the damping rubber at least partially covers the first elastic bending portion. In the above structure, the lens barrel holder has a large vertical movement stroke during normal focusing or dropping, but since the damping rubber is located on the side of the elastic sheet closer to the support frame in the optical axis direction, the first elastic bent part of the elastic assembly moves up and down less, and the damping rubber is not affected by the large pulling state that occurs in the conventional method, and is more stable. When the X/Y direction image stabilization operation or X/Y direction drop occurs, the lens barrel holder and the support frame move relatively closer or farther away, but since the damping rubber is not located between them, the degree of influence is small, and only the bent part with a large curvature moves slightly, making the shape of the lens barrel holder more stable, improving the image stabilization effect, and significantly reducing production costs.

The above is merely a preferred embodiment of the present invention, and those skilled in the art may make improvements without departing from the inventive concept of the present invention, all of which are within the scope of protection of the present invention.

Claims (10)

A lens driving device including: a base; a support frame having an accommodation space and supported by the base; a lens barrel holder that is accommodated in the accommodation space and is used to attach a lens barrel having an optical axis; and an elastic assembly that is fixed to both opposing sides of the support frame in the optical axis direction and elastically supports the lens barrel holder in the accommodation space,
the elastic assembly includes a first fixed arm fixed to the support frame, a second fixed arm fixed to the lens barrel holder, and a plurality of elastic arms connecting the first fixed arm and the second fixed arm, the elastic arms being installed at intervals from the support frame along the optical axis direction, each of the elastic arms including one first elastic bending portion bending and extending from the first fixed arm in a direction approaching the lens barrel holder, and a plurality of second elastic bending portions bending and extending from the first elastic bending portion in a direction approaching the lens barrel holder and connected to the second fixed arm, a radius of curvature of the first elastic bending portion being larger than a radius of curvature of the second elastic bending portion,
the lens driving device further includes a plurality of damping rubbers, each of which is provided between the first elastic bending portion and the support frame, and a fixing structure for fixing the damping rubber is formed on a surface of the support frame corresponding to the first elastic bending portion in the optical axis direction so as to protrude toward the first elastic bending portion, and the first elastic bending portion and the fixing structure are fixedly connected by the damping rubber, and the damping rubber at least partially covers the first elastic bending portion.
A lens driving device comprising:
The lens driving device according to claim 1, characterized in that the elastic assembly includes an upper elastic sheet fixed to the side of the support frame away from the base and a lower elastic sheet fixed to the side of the support frame closer to the base, and the damping rubber is provided between the upper elastic sheet and the support frame. The lens driving device according to claim 2, characterized in that the support frame is rectangular, the fixing structures include four and are located at the four corners of the support frame, the upper elastic sheets include two and are installed opposite each other with a gap between them, each upper elastic sheet includes two elastic arms spaced apart from each other, and the four first elastic bending portions correspond one-to-one to the four fixing structures, respectively. The lens driving device described in claim 1, characterized in that the support frame is formed to be recessed from the support frame toward the surface of the elastic arm in a direction away from the elastic arm along the optical axis direction, and has a main body plastic surface installed at a distance from the elastic arm, and the fixing structure has a protrusion portion that protrudes and extends from the side of the main body plastic surface closer to the elastic arm toward the elastic arm, the protrusion portion is installed opposite the first elastic bending portion at a distance, and the damping rubber is in close contact with the protrusion portion. The lens driving device according to claim 4, characterized in that the protrusion has an annular structure and the damping rubber is partially embedded within the annular region of the protrusion. The lens driving device according to claim 5, characterized in that the fixing structure further includes a rubber groove formed by recessing the main body plastic surface in a direction away from the elastic assembly, the rubber groove being located within an area surrounded by the protrusions, and the damping rubber being at least partially disposed within the rubber groove. The lens drive device according to claim 6, characterized in that the inner diameter of the protrusion gradually increases from the end closest to the rubber groove toward the end farther from the rubber groove. The lens driving device according to claim 1, characterized in that the damping rubber completely covers the first elastic bending portion. The lens driving device according to claim 1, further comprising a case that is provided to cover the base and surrounds the base to form a storage space together with the base, and a suspension wire that supports the support frame movably within the storage space, the suspension wire having one end connected to the base and the other end connected to the elastic assembly. The lens driving device further includes an image stabilization coil fixed to the base, a magnetic steel fixed to the support frame and facing and spaced apart from the image stabilization coil, and an autofocus coil fixed to the lens barrel holder and spaced apart from the magnetic steel, the image stabilization coil working in conjunction with the magnetic steel to drive the support frame to move along a direction perpendicular to the optical axis, and the autofocus coil working in conjunction with the magnetic steel to drive the lens barrel holder to move along the optical axis direction. The lens driving device of claim 1.