TWI693463B - Lens driving device with shaking correction function - Google Patents

Abstract

A lens driving device with shaking correction function includes a shaking correction actuator including first anti-shake coils fixed on a rear side of a magnet holder, second anti-shake coils fixed on a side of a base, a first magnet assembly fixed on the magnet holder and facing the first second anti-shake coils with interval, and a second magnet assembly fixed on the side of the base and facing the first anti-shake coils with interval. The OIS movable part of the lens driving device with shaking correction function only includes one magnet assembly and one group of the anti-shake coils, the other magnet assembly and the other group of the anti-shake coils are configured on the OIS fixed part. Therefore a weight of the movable part is reduced greatly when compared with the traditional movable part having four or two magnet assemblies. A requirement for the suspension springs is reduced, and an overall size can be compacted. Because there is only one magnet assembly or two magnets on the movable part, therefore a magnetic interference in at least one direction can be reduced by layout design, making the lens drive more accurate.

Description

Lens driving device with anti-shake function

The invention relates to a lens driving device with anti-shake function.

With the development of science and technology, all kinds of mobile devices such as tablet computers, mobile phones or smart watches wear micro-cameras. When using the above equipment to take pictures in a human hand, the shaking of the hand causes jitter, which makes the captured picture blurry. There are two main reasons for the blurring of the picture in the existing photography: (1) The object moves relative to the lens, causing a change in the image; ( 2) The deflection of the optical axis of the lens relative to the initial position of the optical axis of the lens causes the image to change.

In order to solve the above problems, an anti-shake camera device is generally used, in which OIS (Optical Image Stabilization, optical anti-shake) is a small movement detected by the gyroscope in the lens, and then the signal is transmitted to the microprocessor for micro-processing The device immediately calculates the amount of displacement that needs to be compensated, and then compensates for the lens shake direction and displacement by compensating the lens group, so as to effectively overcome the image blur caused by vibration. However, the existing OIS optical anti-shake mostly uses dynamic magnetic four-sided magnets or four-corner magnets. This method is more difficult to resist the external magnetic field interference, which will cause one of the magnets to be interfered by the magnetic field, causing the lens to shift, the lens The optical axis is deflected relative to the initial position of the optical axis of the lens, resulting in a change in the image, and it is easy to cause the captured image to be unclear. In addition, the way of setting magnets on four sides or four corners causes the lens to move The weight and size of the part are large, the requirements on the suspension spring are high, and the drive device is difficult to achieve further miniaturization.

In view of this, our inventors are devoted to further research and embarked on research and development and improvement, with a better design to solve the above problems, and after continuous testing and modification, the invention came out.

In view of this, it is necessary to provide a lens driving device with anti-shake function that reduces magnetic interference and the weight of the lens movable part is light.

A lens driving device with anti-shake function, which includes: a base with an opening in the middle; a lens holder for fixing the lens; a magnet holder provided on the outer peripheral side of the lens holder; and a support for supporting the lens holder suspension in the magnet holder The first spring assembly on the peripheral side; a second spring element extending in a direction parallel to the optical axis of the lens for supporting the magnet holder movable in a direction perpendicular to the optical axis; for driving the lens holder along the optical axis A focus actuator that moves in the direction; and an anti-shake actuator that drives the lens holder to move in a direction perpendicular to the optical axis. Among them, the subject direction side is defined as the front side, the direction side opposite to the subject is the rear side, and the first direction perpendicular to the optical axis is the X-axis direction, and the second direction perpendicular to the optical axis and the first direction Is the Y-axis direction, then the anti-shake actuator includes: a first anti-shake coil fixed to the rear side of the magnet holder, which is wound around a direction parallel to the optical axis and located in the Y-axis direction of the lens holder Side or both sides; the second anti-shake coil fixed on one side of the base is wound around the direction parallel to the optical axis and is located on one or both sides of the X-axis direction of the opening; fixed on the magnet holder And a first magnet assembly spaced apart from the second anti-shake coil; and a second magnet assembly fixed on one side of the base and spaced apart from the first anti-shake coil.

As an embodiment, the lens driving device with anti-shake function includes two groups of the second magnet assemblies, which are respectively located on both sides of the opening of the base in the Y-axis direction. Each set of second magnet assembly includes two bipolar magnets arranged side by side, a gap is left between adjacent ends of the two magnets, and the two magnetic poles of each magnet are arranged back and forth along the Y-axis direction.

Preferably, the lens driving device with anti-shake function further includes a position detection element fixed on the rear side of the magnet holder, which detects the gap between the center and one of the two magnets of one of the two sets of second magnet assemblies Relative settings.

As an embodiment, the focus actuator includes: a focus coil wound around the X axis direction, which is fixed to the outer surface of the lens holder in the X axis direction, and the first magnet assembly, which is in contact with the focus coil Opposite in the X axis direction.

As an embodiment, the lens driving device with anti-shake function includes two focus coils, which are respectively fixed on opposite outer surfaces of the lens holder in the X-axis direction.

As an embodiment, the lens driving device with anti-shake function further includes a circuit board fixed on the substrate, and the second anti-shake coil and the second magnet assembly are fixed on the front side of the circuit board.

As another embodiment, the lens driving device with anti-shake function further includes a circuit board fixed on the substrate, the second anti-shake coil is a flat coil formed on the circuit board, and the second magnet assembly is fixed to The front side of the circuit board.

The OIS movable part of the lens driving device with anti-shake function includes only one set or pair of magnets and one set or pair of first anti-shake coils and second anti-shake coils, and the other set or pair of magnets and The first anti-shake coil and the second anti-shake coil are installed in the fixed part of the OIS, so that the weight of the movable part is greatly reduced compared with the existing four sets or two pairs of magnets, the requirements on the suspension spring can be reduced, and the overall size is easy to make Is more compact. Since only one set or a pair of magnets are provided on the movable part, it can be reduced by orientation Magnetic interference in at least one direction makes the lens drive more accurate.

〔this invention〕

1: Base

11: Circuit board

2: Shell

21: opening

31: Mirror mount

311: through hole

32: magnet holder

4: Focus actuator

41: The first spring assembly

411: front side leaf spring

412: Rear leaf spring

42: Focus coil

43: The first magnet assembly

5: Anti-shake actuator

51: second spring element

52: The first anti-shake coil

53: Second magnet assembly

54: second anti-shake coil

6: Position detection element

Z: Z axis direction

X: X axis direction

Y: Y axis direction

FIG. 1 is an exploded schematic view of a lens driving device with anti-shake function provided by the present invention.

FIG. 2 is a schematic plan view of the position detection element and the second magnet assembly of the lens driving device with anti-shake function in FIG. 1.

Regarding the technical means of our inventors, a few preferred embodiments and drawings are described in detail below, in order to provide a deep understanding and recognition of the present invention.

The lens driving device with anti-shake function of the present invention will be described in further detail below with reference to specific embodiments and drawings.

As shown in FIG. 1, in a preferred embodiment, the lens driving device with anti-shake function of the present invention mainly includes a base 1, a circuit board 11 mounted on the base 1, a housing 2 connected to the base 1, and an arrangement A lens holder 31 for fixing a lens (not shown) in the housing 2, a magnet holder 32 provided on the outer peripheral side of the lens holder 31, and a first holder for suspending the lens holder 31 on the inner peripheral side of the magnet holder 32 A spring assembly 41, a second spring element 51 for supporting the magnet holder 32 to be movable in a direction perpendicular to the optical axis, a focus actuator 4 for driving the lens holder 31 to move in the optical axis direction, and a drive The anti-shake actuator 5 that moves the mirror base 31 in a direction perpendicular to the optical axis.

In the following, for convenience of description, the optical axis direction is defined as the Z axis direction, the subject direction side in the optical axis direction is the front side, and the direction side opposite to the subject is the rear side, and the first is perpendicular to the optical axis square The direction is the X-axis direction, and the second direction perpendicular to the optical axis and the first direction is the Y-axis direction. Then, the base 1 has a generally square plate shape, and the four sides are respectively located in the X-axis direction and the Y-axis direction. The housing 2 has a generally square cover shape, which is disposed on the front side of the base 1 in the optical axis direction, and is connected to the base 1 to form a square housing as a whole, so that a housing space for housing other components is formed between the base 1 and the housing 2 . The top surface of the housing 2 is provided with an opening 21 as a light inlet, and a through hole is formed in the middle of the base 1 as a light outlet.

The circuit board 11 is fixed on the front side surface of the base 1 for controlling the focus actuator 4 and the anti-shake actuator 5.

In this embodiment, the lens holder 31 has an octagonal column shape, and a through hole 311 for fixing the lens is formed in the middle of the lens holder 31 through both end surfaces. The outer periphery of the magnet holder 32 is square, and an octagonal hole corresponding to the outer shape of the lens holder 31 is formed in the middle.

The first spring assembly 41 is divided into a front side leaf spring 411 and a rear side leaf spring 412. The inner side of the front plate spring 411 is connected to the front end surface of the mirror holder 31, and the outer side is connected to the front end surface of the magnet holder 32. The inner side of the rear leaf spring 412 is connected to the rear end surface of the mirror holder 31, and the outer side is connected to the rear end surface of the magnet holder 32. The front leaf spring 411 and the rear leaf spring 412 also have elastic wrists connecting the inside and the outside, so that the suspension of the lens holder 31 can be supported on the inner peripheral side of the magnet holder 32, and the lens holder 31 can be along the optical axis of the lens Direction of movement.

The second spring element 51 is a linear spring (also called a suspension spring or suspension wire) extending in a direction parallel to the optical axis, and one end is on the side of the base 1 (in this embodiment, the circuit board 11 fixed on the base 1 ) Is connected, and the other end is connected to the side of the magnet holder 32 (in this embodiment, to the first spring assembly 41 fixed on the magnet holder 32) for supporting the magnet holder 32 (while driving the lens holder 31 together) Move in a direction perpendicular to the optical axis. The second spring element 51 has at least four linear springs, respectively It is provided at the four corners of the lens driving device, that is, connected to the four corners of the circuit board 11 and the front side plate spring 411 and the rear side plate spring 412.

The lens driving device of the present invention has both focusing and anti-shake functions. The focusing actuator 4 is used to drive the lens holder 31 to move in the optical axis direction, and it mainly includes a focusing coil 42 and a first magnet assembly 43. In this embodiment, two focusing coils 42 are included, both of which are wound around the X-axis direction and fixed on the opposite outer side walls of the lens holder 31 in the X-axis direction. The focusing coil 42 is wound into a long circle, and has two long sides that are substantially parallel to the Y-axis direction and two short sides that are substantially parallel to the Z-axis direction. For better driving effect, the short side should be as short as possible. The first magnet assembly 43 is fixed on the inner side of the magnet holder 32, and is arranged in a one-to-one correspondence with the focus coil 42 in the X-axis direction. In this embodiment, it includes two sets of first magnet assemblies 43, which are respectively opposed to the two focus coils 42. Each group of the first magnet assembly 43 includes two bipolar magnets arranged back and forth in the optical axis direction, each magnet is opposed to one long side of the focus coil 42, and the two magnetic poles of the magnet are respectively arranged back and forth in the X axis direction.

The anti-shake actuator 5 is used to drive the lens holder 31 to move in a direction perpendicular to the optical axis. It is mainly fixed to the first anti-shake coil 52 on the rear side of the magnet holder 32, fixed to the side of the base 1 and connected to the first anti-shake The shake coil 52 is spaced apart from the second magnet assembly 53, the first magnet assembly 43, and the second anti-shake coil 54 fixed to the base 1 side and spaced apart from the first magnet assembly 43.

Among them, the first anti-shake coil 52 is wound in a direction parallel to the optical axis and fixed on the rear side of the magnet holder 32 on both sides of the lens holder 31 in the Y-axis direction, which is similar to the focus coil 42 and presents Oblong, its long side is parallel to the X axis direction. It can be understood that a recess or similar fixing portion may be formed on the rear side of the magnet holder 32, and the first anti-shake coil 52 may be fixed in the recess or similar fixing portion.

The second anti-shake coil 54 is wound in a direction parallel to the optical axis and fixed on both sides of the opening of the circuit board 11 in the X-axis direction. It is also oblong, and its long side is parallel to the Y-axis direction. Long side respectively One magnetic pole of the rear magnet in the set of magnets of the first magnet assembly 43 is oppositely arranged in the optical axis direction.

In this embodiment, two sets of second magnet assemblies 53 are respectively fixed on the circuit board 11 of the base 1 and located on both sides of the opening of the base 1 in the Y-axis direction. Each set of second magnet assembly 53 includes two bipolar magnets, which are arranged side by side along the side of the base 1 in the Y-axis direction, a gap is left between adjacent ends of the two magnets, and the two magnetic poles of each magnet are along the Y The axial direction is arranged back and forth, and each magnetic pole is arranged opposite to the one long side of the first anti-shake coil 52 in the optical axis direction.

In order to supply power to the focus coil 42 and the first anti-shake coil 52 suspended in the center of the driving device, the front side plate spring 411 is formed as two independent parts, electrically connected to the focus coil 42 by wires, and respectively connected to the second spring element 51 The two linear springs are electrically connected, and the two linear springs are electrically connected to the circuit board 11 as a power supply path of the focusing coil 42. The rear side plate spring 412 is also formed as two independent parts, electrically connected to the first anti-shake coil 52 by wires, and electrically connected to the other two linear springs of the second spring element 51, respectively. The circuit board 11 is electrically connected and serves as a power supply path for the first anti-shake coil 52. The second anti-shake coil 54 is fixed on the circuit board 11 and can be directly electrically connected to the circuit board 11.

In operation, when the focusing coil 42 is energized, the magnetic field generated by the first magnet assembly 43 is subjected to the Loren magnetic force in the optical axis direction, which can cause the lens holder 31 to move in the optical axis direction, thereby achieving the focusing function. When the occurrence of jitter is detected, the circuit board 11 supplies power to the first anti-shake coil 52, or to the second anti-shake coil 54, or to both the first anti-shake coil 52 and the second anti-shake coil 54 so that The first anti-shake coil 52 and the second anti-shake coil 54 receive the Lorentz force in the X-axis direction or the Y-axis direction or the combined direction of the X-axis direction and the Y-axis direction, thereby controlling the mirror base 31 in a direction perpendicular to the optical axis Move to counteract the impact of jitter and realize optical anti-shake function.

In addition, the anti-shake actuator 5 further includes a position detection element 6 fixed to the rear side of the magnet holder 32, and the detection center of the position detection element 6 is opposed to the gap between the two magnets of a group in the second magnet assembly 53 Set, the detection range covers the adjacent ends of the two magnets. FIG. 2(a) shows the positional relationship between the position detection element 6 and the second magnet assembly 53 in the optical axis direction when the anti-shake function is not activated and the lens driving device is not shaken. FIG. 2(b) shows the positional relationship between the position detection element 6 and the second magnet assembly 53 in the optical axis direction when the anti-shake actuator 5 drives the lens to move in the X-axis direction. FIG. 2(c) shows the positional relationship between the position detection element 6 and the second magnet assembly 53 in the optical axis direction when the anti-shake actuator 5 drives the lens to move in the Y-axis direction. The position detection element 6 is used to detect the change of the magnetic field, and the calculation unit on the circuit board 11 can obtain the specific position of the magnet holder 32 in the direction perpendicular to the optical axis according to the detected change of the magnetic field to form a closed-loop control. In this embodiment, a Hall element is used, and the Hall element may be provided on the front side or the rear side of the first anti-shake coil 52.

In the anti-shake actuator 5 of the lens driving device with anti-shake function described above, the portion supported by the second spring element 51 includes only two sets (a pair) of the first magnet assembly 43, a pair of focus coils 42 and a pair First anti-shake coil 52. Compared with the existing four sets of magnets on four sides or four corners and one focusing coil 42, the movable portion supported by the second spring element 51 is lighter in weight, so that the motion inertia is reduced, and the strength requirement of the second spring element 51 will be reduced. OIS drive is more responsive, easier to control, and more compact. In addition, the magnet holder 32 is provided with a magnet only in the X-axis direction, so that when a magnetic field exists outside the lens drive device in the Y-axis direction, it is not easy to interfere with the operation of the lens drive device, and the device can work normally. It is also convenient to form dual cameras.

In this embodiment, the second anti-shake coil 54 is an independent winding coil, which is fixed on the front side of the circuit board 11. In other embodiments, the second anti-shake coil 54 may be formed on the circuit board 11 by etching or the like Flat coil. In this embodiment, the focus coil 42 is fixed on two opposite outer sides of the lens holder 31 In other embodiments, two or more coils can be provided on each side, so that there are four or more focus coils 42 in total. The corresponding first magnet assembly 43 can be split into a plurality of magnets. Similarly, each first anti-shake coil 52 may be replaced by two or more coils arranged side by side. The second magnet assembly 53 can also be directly fixed on the base 1. Each group of second magnet assemblies 53 may also include three or more magnets arranged side by side, with a gap formed between adjacent magnets. In addition, Hall elements may be provided in both the X-axis direction and the Y-axis direction, so that there are two Hall elements, which are used to detect the movement positions of the mirror base 31 in the X-axis direction and the Y-axis direction, respectively.

In other embodiments, only one set of focusing coil 42 and one set of first magnet assembly 43 may be provided, that is, only one set of focusing coil 42 and first magnet assembly 43 are provided on one side of the lens holder 31 in the X-axis direction , Not set on the other side. Therefore, when forming a dual camera, another group of focus actuators 4 of another lens driving device can be operated together.

In summary, the technical methods disclosed in the present invention can effectively solve the problems of conventional knowledge, etc., and achieve the expected purpose and effect, and have not been published in the publication before the application, have not been publicly used, and have long-term progress. The invention mentioned in the Patent Law is correct, so I filed an application in accordance with the law, and sincerely prayed for the detailed examination and granted the invention patent to Zhi Dexin.

However, the above are only a few preferred embodiments of the present invention, which should not be used to limit the scope of the present invention, that is, any equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention It should still fall within the scope of this invention patent.

1: Base

11: Circuit board

2: Shell

21: opening

31: Mirror mount

311: through hole

32: magnet holder

4: Focus actuator

41: The first spring assembly

411: front side leaf spring

412: Rear leaf spring

42: Focus coil

43: The first magnet assembly

5: Anti-shake actuator

51: second spring element

52: The first anti-shake coil

53: Second magnet assembly

54: second anti-shake coil

6: Position detection element

Z: Z axis direction

X: X axis direction

Y: Y axis direction

Claims (7)

A lens driving device with anti-shake function, characterized in that it includes: a base with an opening in the middle; a lens holder for fixing the lens; a magnet holder provided on the outer peripheral side of the lens holder; for supporting the lens holder suspension at A first spring component on the inner peripheral side of the magnet holder; a second spring element extending in a direction parallel to the optical axis of the lens for supporting the magnet holder to be movable in a direction perpendicular to the optical axis; for driving A focus actuator that moves the lens holder in the direction of the optical axis; and an anti-shake actuator for driving the lens holder to move in a direction perpendicular to the optical axis; wherein, the subject direction side is defined as the front side, and the The direction side opposite to the subject is the rear side, and the first direction perpendicular to the optical axis is the X-axis direction, and the second direction perpendicular to the optical axis and the first direction is the Y-axis direction, then the anti-shake actuator includes : The first anti-shake coil fixed to the rear side of the magnet holder is wound around the direction parallel to the optical axis, and is located on one or both sides of the Y-axis direction of the lens holder; fixed on the side of the base The second anti-shake coil, which is wound in a direction parallel to the optical axis, is located on one or both sides of the X-axis direction of the opening; fixed on the magnet holder and spaced apart from the second anti-shake coil A first magnet assembly; and a second magnet assembly fixed on one side of the base and spaced apart from the first anti-shake coil. The lens driving device with anti-shake function as described in item 1 of the patent application scope, which includes two groups of the second magnet components, which are located on both sides of the opening of the base in the Y-axis direction; The iron assembly includes two bipolar magnets arranged side by side, a gap is left between adjacent ends of the two magnets, and the two magnetic poles of each magnet are arranged back and forth along the Y-axis direction. The lens driving device with anti-shake function as described in item 2 of the patent scope, which also includes a position detection element fixed to the rear side of the magnet holder, which detects the center and one of the two sets of second magnet assemblies The gap between the two magnets is set oppositely. The lens driving device with anti-shake function as described in item 1 of the patent application scope, wherein the focus actuator includes: a focus coil wound around the X axis direction, which is fixed to the lens holder outside the X axis direction On the side; and the first magnet assembly, which is spaced apart from the focusing coil in the X-axis direction. The lens driving device with anti-shake function as described in item 4 of the patent application scope includes two focusing coils, which are respectively fixed on opposite outer surfaces of the lens holder in the X-axis direction. The lens driving device with anti-shake function as described in item 4 of the patent application scope further includes a circuit board fixed on the substrate, and the second anti-shake coil and the second magnet assembly are fixed on the front side of the circuit board. The lens driving device with anti-shake function as described in item 4 of the patent application scope also includes a circuit board fixed on the substrate, and the second anti-shake coil is a flat coil formed on the circuit board. The two magnet assembly is fixed on the front side of the circuit board.

Images