TWI644128B - Lens driving device - Google Patents

Abstract

A lens driving device includes a base, a frame, a carrier, a focus driving unit, and a tilt driving unit. The frame is movably connected to the base. The carrier is used to carry the lens and is movably disposed within the frame. The focus driving unit includes at least one first coil and a first magnetic component, the first coil is disposed on the carrier, the first magnetic component is disposed on the frame, and electromagnetic induction is generated between the first coil and the first magnetic component to enable the bearing The seat moves relative to the base along the optical axis of the lens. The tilt driving unit includes a plurality of first electromagnetic driving portions and a second electromagnetic driving portion. The first electromagnetic driving portion is disposed on the opposite side of the carrier, the second electromagnetic driving portion is disposed on the frame, and the first and second electromagnetic driving units are Electromagnetic induction is generated between the portions to tilt the carrier relative to the base.

Description

Lens drive

The present invention relates to a lens driving device; and more particularly to a lens driving device having a rotation correcting/compensating function.

At present, handheld digital products (such as cameras, mobile phones or tablets) almost all have digital camera functions, thanks to the miniaturization of the lens drive.

In general, hand-held digital products often cause the internal lens drive to vibrate due to vibration during use, which may cause the image to be blurred. The optical image stabilizer is disclosed in the patent document TW I457693. When the autofocus is applied, the internal coil is energized to interact with the corresponding magnet, so that the lens mount fixed to the coil can be along the lens. The axis direction (ie, the Z-axis direction) is moved to achieve the effect of autofocus, and an X-axis and Y-axis displacement sensor is further disposed in the optical image anti-vibration device for sensing the optical axis in the X-axis and the Y-axis direction. Position, and then electromagnetic induction through the coils and magnets corresponding to the X-axis and the Y-axis, respectively, to adjust the lens to the correct position (ie, correct the horizontal offset of the optical axis in the X-axis and Y-axis directions), thus Can achieve shockproof effect and obtain better image quality.

As described above, the conventional optical image anti-vibration device can effectively perform the deviation of the lens and its optical axis due to vibration in the vertical direction (ie, the optical axis direction) and the horizontal direction (ie, the direction perpendicular to the optical axis). Correction/compensation. However, handheld numbers The swaying mode of the internal lens driving device when the product is in use is actually more complicated, and is not limited to the vertical direction and the horizontal direction. Therefore, it is necessary to provide a lens driving device with better shockproof effect.

In view of the above-mentioned problems, the main object of the present invention is to provide a lens driving device having a rotation correction/compensation function, which can simultaneously be in the vertical direction (ie, the Z-axis direction) and the horizontal direction (ie, the lens and its optical axis). In the X-axis and Y-axis directions, the offset due to vibration and the rotation of the lens in the X-axis or Y-axis direction are corrected/compensated, so that a better anti-shock effect can be achieved, and a better image quality can be obtained.

According to some embodiments, a lens driving device includes a base, a frame, a carrier, a focus driving unit, and a tilt driving unit. The frame is movably connected to the base. The carrier is configured to carry a lens and is movably disposed within the frame. The focus driving unit includes at least one first coil and at least one first magnetic component, the first coil is disposed on the carrier, the first magnetic component is disposed on the frame and corresponds to the first coil, and the first coil and the first magnetic component Electromagnetic induction is generated to move the carrier relative to the base along the optical axis of one of the lenses. The tilt driving unit includes a plurality of first electromagnetic driving portions and a plurality of second electromagnetic driving portions. The first electromagnetic driving portion is disposed on the opposite side of the carrier, and the second electromagnetic driving portion is disposed on the frame and corresponds to the first electromagnetic driving. And generating electromagnetic induction between the first and second electromagnetic driving portions to tilt the carrier relative to the base.

According to some embodiments, the first electromagnetic driving portion is a driving coil having an elliptical structure, and the second electromagnetic driving portion is a driving magnet.

According to some embodiments, the first coil and the first electromagnetic driving portion Both are disposed on the carrier, and the first coil partially overlaps the first electromagnetic driving portion as viewed from the optical axis direction.

According to some embodiments, the focus drive unit includes a plurality of first magnetic elements respectively disposed on opposite sides of the frame and corresponding to the drive magnets of the tilt drive unit.

According to some embodiments, the driving magnet is a multi-polar magnet, and each of the first magnetic elements and the corresponding driving magnet constitute a single multi-polar magnet integrally formed.

According to some embodiments, the multi-polarity magnet has a plurality of magnetic regions having different sizes in the optical axis direction, and the driving coil corresponding to the multi-polar magnet has an upper half and a lower half corresponding to the different magnetic bodies respectively. Area.

According to some embodiments, the direction of current flow to the drive coils disposed on opposite sides of the aforementioned carrier is the same or opposite.

According to some embodiments, the lens driving device further includes an elastic member connecting the carrier and the frame, wherein the elastic member has a plurality of carrier connection portions for connecting the carrier portion, and the carrier connection on the opposite side of the carrier seat The portion determines at least one axis of rotation of the carrier.

According to some embodiments, the aforementioned rotating shafts are arranged in a cross shape as viewed from the optical axis direction, and the optical axes pass through the intersection of the rotating shafts.

According to some embodiments, the driving magnet is a general magnet, and each of the first magnetic elements and the corresponding driving magnets constitute a single general magnet integrally formed, wherein the general magnet has a single magnetic domain in the optical axis direction, and at the same time Corresponding to one of the first coil and the drive coil.

According to some embodiments, the foregoing lens driving device further includes a base a plate is disposed on the base, wherein the substrate has a plurality of second coils respectively corresponding to the multi-polarity magnets, and electromagnetic induction is generated between the second coil and the multi-polarity magnets, so that the frame is along the optical axis with respect to the base Move in the vertical direction.

According to some embodiments, the lens driving device further includes a substrate disposed on the base, wherein the substrate has a plurality of second coils respectively corresponding to the foregoing general magnets, and electromagnetic induction is generated between the second coil and the general magnets, so that The frame moves relative to the base in a direction perpendicular to the optical axis.

According to some embodiments, the first coil, the first electromagnetic driving portion and the second coil collectively correspond to the aforementioned multi-polar magnet or the general magnet.

According to some embodiments, the first coil and the first electromagnetic driving portions collectively correspond to one surface of each multi-polar magnet or each general magnet, and the surface is parallel to the optical axis.

According to some embodiments, each of the aforementioned second coils corresponds to the other side of each of the multi-polar magnets or the respective general magnets, and the other side is perpendicular to the optical axis.

According to some embodiments, the lens driving device further includes a plurality of suspension wires for suspending the frame and the carrier therein.

According to some embodiments, the lens driving device further includes a resilient member, which is a reed having a plurality of reed portions, wherein the reed portions are electrically connected to the first coil of the focus driving unit, and the reed portions are The first electromagnetic driving portion of the tilt driving unit is electrically connected.

According to some embodiments, the lens driving device further includes a plurality of stopping mechanisms formed between the frame and the carrier, and the stopping mechanism is arranged in another cross shape.

According to some embodiments, the aforementioned other cross type and the aforementioned rotating shaft The crosses arranged in a cross shape do not overlap, and have an angle of not zero degrees.

According to some embodiments, the aforementioned rotating shaft and the aforementioned second electromagnetic driving portion are parallel or perpendicular to each other in a plane corresponding to the first electromagnetic driving portion.

1‧‧‧Lens driver

10‧‧‧ top shell

12‧‧‧Top case opening

20‧‧‧ Pedestal

22‧‧‧Base opening

30‧‧‧Hosting

32‧‧‧through holes

34‧‧‧Protruding

40‧‧‧Frame

50‧‧‧Substrate

60‧‧‧Upper reed

62‧‧‧ Reed section

62A‧‧‧Bearing joint

62B‧‧‧Frame connection

70‧‧‧Reed

80‧‧‧hanging line

90‧‧‧stop mechanism

92‧‧‧Bumps

94‧‧‧ Groove

A1‧‧‧ double arrow

C1‧‧‧first coil

C21, C22‧‧‧ second coil

D11, D12‧‧‧ first electromagnetic drive department

D21, D22‧‧‧Second Electromagnetic Drive Department

H1, H2‧‧‧ height

M1‧‧‧First magnetic component

M2‧‧‧General magnet

P1‧‧‧ upper half

P2‧‧‧ lower half

R1, R2‧‧‧ rotating shaft

F1, F2‧‧‧ electromagnetic induction

O‧‧‧ optical axis

Fig. 1 is a view showing an exploded view of a lens driving device according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the assembly of some components (excluding the top case) of the lens driving device of Fig. 1.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2.

Fig. 4 is a view showing the structure of the second electromagnetic driving portion (multipolar magnet) in Fig. 1.

Fig. 5 is a view showing the positional relationship between the second coil and the second electromagnetic drive unit.

Fig. 6 is a top plan view showing the positional relationship between the carrier, the first electromagnetic drive unit and the second electromagnetic drive unit.

Fig. 7 is a side elevational view showing the positional relationship between the carrier, the first coil, the first electromagnetic drive unit, and the second electromagnetic drive unit.

Figure 8 is a top plan view showing the positional relationship of the upper reed, the carrier and the frame.

Figures 9A and 9B show schematic views of a plurality of magnetic elements in which a common multi-polar magnet is changed to be separated in some embodiments of the present invention.

Fig. 10 is a view showing a modification of a multipolar magnet to a general magnet to reduce the height of the frame in another embodiment of the present invention.

The above and other objects, features, and advantages of the invention will be apparent from The arrangement of the various elements in the embodiments is for illustrative purposes and is not intended to limit the invention.

The same component numbers and/or characters may be repeated in the following various embodiments, which are for the purpose of simplicity and clarity, and are not intended to limit the specific relationship between the various embodiments and/or structures discussed.

In the drawings, the shape or thickness of the embodiments may be expanded and indicated in a convenient and simplified manner. It is to be noted that elements not shown or described in the embodiments are known to those of ordinary skill in the art. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

First, please refer to the first to third embodiments. The lens driving device 1 of the embodiment of the present invention is, for example, a voice coil motor (VCM), which can be disposed in a handheld digital product (such as a camera, a mobile phone or The tablet is used to carry and drive a lens (not shown). As can be seen from the first to third figures, the lens driving device 1 includes a top case 10, a base 20, a carrier 30, a frame 40, a substrate 50, an upper reed 60, and a lower reed 70. A plurality of suspension wires 80, a first coil C1, a plurality of second coils C21 and C22, a plurality of first electromagnetic driving portions D11 and D12, and a plurality of second electromagnetic driving portions D21 and D22.

As shown in FIG. 1, the top case 10 has a hexahedron appearance, and an opening is formed on the bottom surface thereof, and can be combined with the substantially square base 20 to form the aforementioned other components for housing the lens driving device 1. A space for accommodation. It should be understood that the top case The shape of the base 10 and the base 20 are not limited to the embodiment, and may be changed according to actual needs. Moreover, the top case 10 and the base 20 are respectively formed with a top case opening 12 and a base opening 22, the centers of which are located on an (imaging) optical axis O of the lens (not shown), and are based on An image sensing component (such as a CCD, not shown) may be disposed under the housing 20, whereby the lens and the image sensing component may focus on the optical axis O to perform a photographing or imaging function.

As shown in FIG. 1 , the center of the carrier 30 has a through hole 32 for receiving a lens (not shown), wherein the corresponding threaded structure is disposed between the through hole 32 and the lens (not shown). The lens can be locked in the through hole 32. The first coil C1 is wound around the outer circumferential surface of the carrier 30. As shown in FIGS. 1 and 6, in the present embodiment, the shape of the carrier 30 is substantially octagonal when viewed from the direction of the optical axis O, and the first coil C1 is octagonal in conformity with the shape of the carrier 30. However, the present invention is not limited thereto. In some embodiments, the first coil C1 may conform to the shape of the carrier 30 to have a polygonal shape such as a rectangle, a square, or a hexagon.

As shown in FIGS. 1 and 3, the carrier 30 and the first coil C1 thereon are disposed in the frame 40. In the present embodiment, the frame 40 has an octagonal structure corresponding to the shape of the carrier 30, but it may have a polygonal structure such as a rectangle, a square or a hexagon. As can be seen from FIGS. 1 and 3, the two sets of second electromagnetic driving portions D21 and D22 (having a long plate type structure) extending in the X-axis and Y-axis directions respectively are disposed on the frame 40 and correspond to The aforementioned first coil C1. More specifically, in the present embodiment, the second electromagnetic driving portions D21 and D22 are driving magnets, for example, multi-polar permanent magnets (please refer to FIG. 4), wherein the upper portions of the second electromagnetic driving portions D21 and D22 are The lower two portions are formed with two opposite magnetic poles (i.e., magnetic region NS and magnetic region SN) in a direction parallel to the X-axis or the Y-axis. Further, the aforementioned second electromagnetic driving portions D21, D22 may be, for example Adhesively fixed to the inside of the four side walls of the frame 40 extending along the X-axis and the Y-axis direction, and the position of the first coil C1 on the carrier 30 corresponds to the magnetic force under the adjacent second electromagnetic driving portions D21, D22 Zone (see Figure 7). In some embodiments, the frame 40 can have a non-conductive material (such as plastic) or a magnetically conductive material (such as nickel-iron alloy, etc.). When the frame 40 is made of a magnetically conductive material, the structural strength and the magnetic force can be improved. Inner loop.

With the above configuration, when the lens driving device 1 is in a focus state, a current can be input from an external power source (not shown) to the first coil C1, so that the first coil C1 and the second electromagnetic driving portion D21, D22 Electromagnetic induction is generated between the (drive magnets), and the carrier 30 connected to the first coil C1 can move back and forth along the optical axis O direction with respect to the susceptor 20 (as indicated by the double arrow A1 in FIG. 7). And make the lens reach the focus quickly. In the present embodiment, the first coil C1 and the second electromagnetic drive portions D21, D22 constitute a focus drive unit of the lens driving device 1.

As shown in FIGS. 1 and 3, the carrier 30 and the lens therein can also be suspended from the center of the frame 40 through the upper reed 60 and the lower reed 70 (for example, metal domes) made of an elastic material. More specifically, the upper reed 60 can simultaneously connect the top of the carrier 30 and the top of the frame 40, while the lower reed 70 can simultaneously connect the bottom of the carrier 30 to the bottom of the frame 40. In this way, when the frame 40 is impacted by an external force, the carrier 30 can be displaced in the Z-axis direction relative to the frame 40 through the upper and lower reeds 60 and 70, thereby generating a vertical direction (ie, the optical axis O direction). The cushioning effect is to avoid damage to the carrier 30 and the lens therein. Further, the upper and lower reeds 60 and 70 can also limit the moving distance of the carrier 30 in the direction of the optical axis O (in the in-focus state). In some embodiments, the carrier 30 can also be suspended from the center of the frame 40 by a single upper reed 60 or lower reed 70.

As shown in Figures 1, 2, 3 and 5, the substantially square substrate 50 is provided It is placed on the susceptor 20 and has two sets of second coils C21 and C22 (having an elliptical structure) extending in the X-axis and Y-axis directions, respectively. In this embodiment, the substrate 50 is a flexible printed circuit board, and the second coils C21, C22 may be formed on or embedded in the surface of the substrate 50 and respectively correspond to the four second electromagnetic drives on the frame 40. Parts D21, D22 (drive magnets). As can be seen from Figures 1 and 5, each of the second coils C21, C22 corresponds to one of the second electromagnetic drive portions D21, D22, and the face is perpendicular to the optical axis O (i.e., the Z-axis).

Further, although not shown, a magnetic field sensing element is mounted on one side of the substrate 50 extending in the X-axis direction and one side extending in the Y-axis direction, for example, a Hall sensor (Hall effect) Sensor, a magneto-sensitive sensor (MR sensor), or a flux sensor (Fluxgate), etc., for sensing the movement of the two second electromagnetic driving portions D21, D22 corresponding to the positions on the frame 40 The magnetic field changes, and the amount of displacement of the frame 40 with respect to the substrate 50 (and the susceptor 20) in the X-axis direction and the Y-axis direction can be known.

As can be seen from Figures 1 and 2, in the present embodiment, six suspension wires 80 are connected between the frame 40 and the base 20, wherein one end of each suspension wire 80 can be connected to the frame 40 by, for example, welding. The upper reed 60 is connected, and the other end can also be connected to the susceptor 20 by, for example, soldering. In this way, the suspension wire 80 can suspend the frame 40 and the carrier 30 therein from the base 20, and when the frame 40 is subjected to an external force, the frame 40, the carrier 30 and the lens therein can be used. Displacement occurs in the XY plane, which in turn produces a buffering effect in the horizontal direction (ie, perpendicular to the optical axis O). The suspension wire 80 can be made of an elastic material (for example, a metal rod having elasticity), and the number thereof can be adjusted as needed. It is worth mentioning that, in some embodiments, the susceptor 20 can be electrically connected to the outer peripheral surface of the carrier 30 via the suspension wire 80 and the upper reed 60. The first coil C1 is electrically connected to an external power source (not shown).

Further, when the frame 40 is impacted by an external force and the optical axis O of the lens is offset with respect to the substrate 50 (and the susceptor 20), the magnetic field sensing element on the substrate 50 can be sensed between the frame 40 and the substrate 50. The horizontal displacement (parallel to the XY plane) to know the offset between the position of the optical axis O and its correct position. Then, when the lens and its optical axis O are to be corrected back to the correct position, a second coil C21 with a current in the X-axis direction can be passed, so that the second coil C21 and the second electromagnetic driving portion D21 corresponding to the position thereof Electromagnetic induction is generated between the driving magnets to drive the second electromagnetic driving portion D21 and the frame 40 to be displaced along the X-axis direction with respect to the substrate 50 and the susceptor 20; similarly, when a current is applied to the Y-axis direction In the second coil C22, electromagnetic induction is generated between the second coil C22 and the second electromagnetic driving portion D22 (driving magnet) corresponding to the position thereof to drive the second electromagnetic driving portion D22 and the frame 40 relative to the substrate 50. The susceptor 20 is displaced in the Y-axis direction. Thereby, the lens and its optical axis O can be controlled to be displaced in the XY plane, and the offset compensation and anti-shake effect can be achieved. In this embodiment, the second coils C21, C22 and the second electromagnetic driving portions D21, D22 constitute an anti-shake unit of the lens driving device 1, wherein the anti-shake unit and the focus driving unit share the second electromagnetic driving portions D21, D22 (multipolar magnet).

Referring to FIGS. 1 , 3 , 6 and 7 , a plurality of protrusions 34 are formed on the outer circumferential surface of the carrier 30 , and the first electromagnetic driving portions D11 and D12 are, for example, driving coils having an elliptical structure. A pair of first electromagnetic driving portions D11 are fixed to the opposite side wall of the carrier 30 in the X-axis direction by surrounding the protruding portion 34, and correspond to one pair of the second electromagnetic driving portions D21 on the frame 40, and The pair of first electromagnetic driving portions D12 are fixed to the opposite side wall of the carrier 30 in the Y-axis direction by surrounding the protruding portion 34, and correspond to one pair of the second electromagnetic driving on the frame 40. Department D22. It is to be noted that in the embodiment, the first coil C1 and the first electromagnetic driving portions D11 and D12 jointly correspond to one surface of each of the second electromagnetic driving portions D21 and D22, and the surface is parallel to the optical axis O. (as shown in Figure 3).

As shown in FIGS. 1 and 7, each of the first electromagnetic driving portions D11 and D12 (elliptical driving coil) has an upper half P1 and a lower half P2 extending in the X-axis or Y-axis direction (first electromagnetic driving) The upper portion D1 and the lower half portions P1 and P2 extend in the Y-axis direction, and the upper and lower half portions P1 and P2 of the first electromagnetic driving portion D12 extend in the X-axis direction, and the first electromagnetic driving portions D11 and D12 The upper and lower halves P1 and P2 respectively correspond to different magnetic regions in the direction of the optical axis O of the adjacent second electromagnetic driving portions D21 and D22 (multipolar magnets). It can be seen from FIG. 7 that in the present embodiment, each of the second electromagnetic driving portions D21 and D22 has a different size in the upper and lower magnetic regions along the optical axis O, wherein the lower magnetic region is larger than the upper magnetic region. At the same time, it can correspond to the first coil C and the lower half P2 of the first electromagnetic driving portions D11 and D12. It should be understood that although the first electromagnetic driving portions D11 and D12 in the embodiment are mounted on the upper side of the carrier 30 (relative to the first coil C1), the first electromagnetic driving portions D11 and D12 may be mounted on the first electromagnetic driving portions D11 and D12. The lower side of the carrier 30 (relative to the first coil C1) may be arranged upside down as long as the second electromagnetic driving portions D21 and D22 are arranged upside down.

In addition, in the present embodiment, the second electromagnetic driving portions D21, D22 located on the opposite side of the carrier 30 have the same magnetic domain configuration with respect to the adjacent first electromagnetic driving portions D11, D12, for example, corresponding to the first electromagnetic The magnetic regions of the upper half P1 of the driving portions D11 and D12 include an inner S pole and an outer N pole, and the magnetic regions corresponding to the lower half P2 of the first electromagnetic driving portions D11 and D12 include an inner N pole and an outer S pole. In some embodiments, the magnetic pole directions of the upper and lower magnetic regions may also be reversed.

With the above configuration, when the access is provided on the opposite side of the carrier 30 When the current directions of the first electromagnetic driving portions D11 and D12 (driving coils) are opposite, the first electromagnetic driving portions D11 and D12 located on the opposite side of the carrier 30 and the second electromagnetic driving portions D21 and D22 can be disposed. Two electromagnetic inductive forces F1 and F2 (see FIG. 7) that are parallel to the optical axis O and opposite in direction are generated, thereby driving the carrier 30 (within the frame 40) to tilt relative to the base 20. In the present embodiment, the first electromagnetic driving portions D11 and D12 and the second electromagnetic driving portions D21 and D22 constitute the tilt driving unit of the lens driving device 1.

Referring to FIG. 8, the foregoing upper reed 60 (elastic element) may be divided into a plurality of (for example, four) reed portions 62, and each reed portion 62 has a carrier connection portion 62A for connecting the carrier 30. And a frame connecting portion 62B for connecting one of the frames 40. It should be understood that the carrier connection portion 62A fixed to the carrier 30 can be regarded as the rotation fulcrum of the carrier 30, and the carrier connection portion 62A located on the opposite side of the carrier 30 determines the rotation axis of the carrier 30. R1 and a rotation axis R2 (for example, two carrier connection portions 62A positioned in the X-axis direction may determine the rotation axis R1, and two carrier connection portions 62A positioned in the Y-axis direction may determine the rotation axis R2). As can be seen from Fig. 8, in the present embodiment, the rotation axis R1 is parallel to the X-axis direction, the rotation axis R2 is parallel to the Y-axis direction, and the rotation axes R1 and R2 can be arranged in a cross as viewed from the optical axis O direction. Type, in which the optical axis O passes through the intersection of the two rotating axes R1 and R2. As shown in FIGS. 6 and 8, the rotation axes R1 and R2 and the second electromagnetic drive portions D21 and D22 correspond to the planes of the first electromagnetic drive portions D11 and D12 in parallel or perpendicular to each other. In addition, in some embodiments, the design of the aforementioned carrier connection portion 62A can also be applied to the lower reed 70.

Accordingly, as shown in FIGS. 6 to 8, when the current is supplied to the first electromagnetic driving portion D12 (on the Y-axis direction) on the opposite side of the carrier 30, and the first electromagnetic driving portion D12 is When electromagnetic induction is generated between the second electromagnetic driving portions D22, the carrier 30 can be driven to rotate around the rotating shaft R1 (ie, the X axis); similarly, when the access is made When the current is in the first electromagnetic driving portion D11 (on the X-axis direction) on the opposite side of the carrier 30, and electromagnetic induction is generated between the first electromagnetic driving portion D11 and the second electromagnetic driving portion D21, the driving can be driven The carrier 30 rotates about the rotation axis R2 (i.e., the Y axis). It is worth mentioning that, in some embodiments, the first electromagnetic driving portion D12 can be electrically connected to the base 20 through the two reed portions 62 of the upper reed 60 and the two suspension wires 80, and the first electromagnetic driving portion The D11 can be electrically connected to the base 20 through the other two reed portions 62 of the upper reed 60 and the other two suspension wires 80, and the base 20 is electrically connected to an external power source (not shown).

Furthermore, a plurality of stopping mechanisms 90 may be further disposed between the carrier 30 and the frame 40 for limiting the rotation angle of the carrier 30. For example, as shown in FIGS. 1 and 8, a plurality of outwardly extending projections 92 may be provided at four corners of the carrier 30, and positions corresponding to the aforementioned four projections 92 on the frame 40 may be The plurality of grooves 94 have a shape corresponding to the shape of the protrusions 92, so that the protrusions 92 and the grooves 94 (constituting the stopping mechanism 90) can be in the foregoing inclined driving unit. The rotation of the drive carrier 30 is limited when it is rotated to prevent the carrier 30 from being tilted arbitrarily or excessively. It should be noted that, in this embodiment, the plurality of stopping mechanisms 90 are arranged in a cross shape, and the cross-shaped stopping mechanism 90 does not overlap with the cross type in which the rotating shafts R1 and R2 are arranged. There is a non-zero angle between the profiles (preferably 45 degrees, as shown in Fig. 8), which may also be advantageous to cause the carrier 30 to stop at a particular angle on average without arbitrarily tilting. In addition, in some embodiments, the positions of the protrusions 92 and the grooves 94 may be mutually adjusted, that is, the protrusions 92 may be formed on the frame 40, and the grooves 94 may be formed on the carrier 30.

In this way, the lens driving device 1 can be made to be shocked in the vertical direction (ie, the Z-axis direction) and the horizontal direction (ie, the X-axis and the Y-axis direction) for the lens and its optical axis. The offset that occurs can be corrected/compensated, and it has the function of rotation correction/compensation.

For example, when the handheld digital product is in use, the internal lens carrier may be skewed relative to the base due to vibration (or impact by an external force), and the carrier 30 can be rotated around the rotating shaft R1 and/or through the above. Or the action of the rotation axis R2 to correct the skew of the lens and its optical axis, thereby obtaining better image quality. In addition, when the general lens is combined with the carrier, due to factors such as part tolerances and assembly methods, the lens and its optical axis may be skewed. The above rotation correction/compensation function can also overcome the production. Defects, which in turn increase the production yield of the product.

Although the lens driving device 1 of the above embodiment has only the 5-axis (X-axis, Y-axis, Z-axis, rotation axis R1, and/or rotation axis R2) compensation functions, it is configured by more groups (3 groups, 4 groups, or more). a plurality of sets of first electromagnetic driving portions D11 and D12 and second electromagnetic driving portions D21 and D22 (for example, the other first electromagnetic driving portions D11 and D12 are disposed on other side walls of the carrier 30 that have not been utilized, and The second electromagnetic driving portions D21 and D22 are disposed at the corners between the four side walls of the frame 40, and the number and position of the carrier connecting portions 62A of the upper reed 60 are adjusted, and six or seven axes or more can also be realized. Multi-axis compensation.

It is to be noted that, in the above embodiment, the first coil C1 of the focus driving unit and the first electromagnetic driving portions D11 and D12 of the tilt driving unit are disposed on the carrier 30 and viewed from the optical axis O. An electromagnetic drive unit D11, D12 partially overlaps the first coil C1. In addition, the focus driving unit, the anti-shake unit and the tilt driving unit can share the second electromagnetic driving portions D21 and D22, that is, the first coil C1 of the focus driving unit, the second coils C21 and C22 of the anti-shock unit, and the tilt driving. unit The first electromagnetic driving portions D11 and D12 (driving coils) collectively correspond to the second electromagnetic driving portions D21 and D22 (multipolar magnets), so that the number of components, the assembly process, and the product size can be effectively reduced (that is, advantageous) In miniaturization).

However, in some embodiments, the focus drive unit and the tilt drive unit may not share the second electromagnetic drive portions D21, D22 (multipolar magnets). Referring to the embodiment shown in FIG. 9A, the difference from the embodiment shown in FIG. 7 is that the focus driving unit includes a plurality of (for example, four) first magnetic elements M1 (for example, having two magnetic poles). a general magnet), wherein the first magnetic element M1 is respectively fixed on the opposite side of the frame 40 (refer to FIG. 1), and is in position with the plurality of second electromagnetic driving portions D21, D22 (multipolar magnets) of the tilt driving unit Corresponding, but separated from each other. In contrast, the second electromagnetic driving portions D21 and D22 in FIG. 7 can be regarded as integrally forming the first magnetic element M1 in FIG. 9A and the corresponding second electromagnetic driving portions D21 and D22 (multipolar magnets). Single multi-polar magnet.

In some embodiments, the number of the aforementioned first magnetic elements M1 may be at least one. In some embodiments, the aforementioned focus driving unit may include a plurality of first coils C1 fixed to the carrier 30 at positions respectively corresponding to the first magnetic element M1, and the first coil C1 may have an elliptical structure. In some embodiments, the magnetic pole directions of the first magnetic element M1 located on the opposite side of the carrier 30 may be the same or opposite, and the current direction of the first coil C1 on the opposite side of the carrier 30 may correspond. The ground is the same or the opposite. In some embodiments, the magnetic regions of the second electromagnetic driving portions D21, D22 (multipolar magnets) located on opposite sides of the carrier 30 may be the same or opposite to the magnetic regions of the adjacent first electromagnetic driving portions D11, D12. The current directions of the first electromagnetic driving portions D11, D12 on the opposite side of the carrier 30 may be correspondingly the same or opposite. In some embodiments, the tilt drive unit is fixed to the carrier 30 The first electromagnetic driving portions D11 and D12 can be changed to drive magnets (for example, multi-polar magnets), and the second electromagnetic driving portions D21 and D22 fixed to the frame 40 can be changed to drive coils (for example, elliptical coils). .

Referring to the embodiment shown in Fig. 9B, the second electromagnetic driving portions D21, D22 in Fig. 9A are changed from a multipolar magnet to two general magnets M2 which are vertically separated. As can be seen from Fig. 9B, the magnetic poles of the two general magnets M2 are opposite in direction, and correspond to the upper half P1 and the lower half P2 of the first electromagnetic driving portions D11 and D12 (elliptical driving coils), respectively.

Although not shown, the anti-shake unit in the embodiment shown in FIGS. 9A and 9B may share the first magnetic element M1 of the focus drive unit or the second electromagnetic drive unit D21, D22 which may share the aforementioned tilt drive unit. (multipolar magnet) or general magnet M2.

Referring to FIG. 10, in some embodiments, the second electromagnetic driving portions D21 and D22 (driving magnets, which are not shown in the figure) of the tilting driving unit fixed to the frame may be used. The polar magnet is changed to a single general magnet (ie, has two magnetic poles). It can be seen from FIG. 10 that the second electromagnetic driving portions D21 and D22, which are changed to the general magnets, have a single magnetic domain along the optical axis O direction, which can simultaneously correspond to the first electromagnetic driving portions D11 and D12 (driving coils, Since the viewing angle relationship D11 is not shown in the figure, the lower half P2 and the first coil C1 of the focus driving unit. It is to be noted that, although not shown, the second coil of the anti-shake unit in the embodiment may be combined with the first coil C1 of the focus drive unit and the first electromagnetic drive units D11 and D12 of the tilt drive unit ( The drive coils collectively correspond to the aforementioned second electromagnetic drive portions D21, D22 (general magnets). For example, the first coil C1 and each of the first electromagnetic driving portions D11 and D12 (driving coils) may collectively correspond to the respective second electromagnetic driving portions D21, One side of D22 (general magnet), and this face is parallel to the optical axis O (as shown in Fig. 10). Further, each of the second coils may correspond to the other surface of each of the second electromagnetic driving portions D21, D22 (general magnets), and the other surface is perpendicular to the optical axis O.

Thereby, the focusing function of the focus driving unit and the rotation correction/compensation function of the tilt driving unit in the above-described embodiments (first to ninth drawings) can be achieved in the same manner. In addition, the second coil (formed in the substrate 50, not shown) of the anti-shock unit can also generate electromagnetic induction between the second electromagnetic driving portions D21 and D22 (general magnets), thereby driving the frame 40 relative to the substrate 50. And the pedestal 20 (see Figures 1 and 3) moves in a direction perpendicular to the optical axis O to achieve horizontal offset compensation and anti-shake effect. It should be understood that, in the embodiment shown in FIG. 10, since the height H1 of the second electromagnetic driving portions D21 and D22 in the optical axis O direction can be small (compared to the second electromagnetic driving portion in FIG. 3) The heights of D21 and D22 are such that the height H2 of the frame 40 can be correspondingly reduced, thereby facilitating the reduction of the volume of the lens driving device.

Further, the second electromagnetic driving portions D21 and D22 (general magnets) can be regarded as omitting the general magnet M2 corresponding to the upper half P1 of the first electromagnetic driving portions D11 and D12 in the embodiment of the ninth embodiment, and will correspond to The general magnet M2 (drive magnet) and the first magnetic element M1 (general magnet) of the lower half P2 of the first electromagnetic drive portions D11 and D12 constitute a single general magnet integrally formed, thereby reducing material cost, assembly process, and product weight. However, in some embodiments, the second electromagnetic driving portions D21, D22 (general magnets) may be changed to separate general magnets M2 (corresponding to the lower portions P2 of the first electromagnetic driving portions D11, D12) and the first Magnetic element M1.

In summary, according to an embodiment of the present invention, at least one set of electromagnetic driving portions can be added to the carrier, which can generate electromagnetic induction through a corresponding electromagnetic driving portion on the frame, and can drive the carrier and the lens therein relative to the lens. Tilting of the base (ie, rotation), thereby achieving the effect of correcting/compensating for the rotation of the optical axis of the lens along at least one axis of rotation (eg, the X-axis or the Y-axis). In addition, since the focus drive unit and the anti-shock unit in the lens driving device can share the electromagnetic driving portion on the frame, the number of components, the assembly process, the material cost, and the product size can be reduced.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. Those skilled in the art having the ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (19)

A lens driving device includes: a base; a frame movably connected to the base; a carrier for carrying a lens and movably disposed in the frame; and a focus driving unit including at least one first a coil and at least one first magnetic component, the first coil is disposed on the carrier, the first magnetic component is disposed on the frame and corresponds to the first coil, and the first coil and the first magnetic component Electromagnetic induction is generated to move the carrier relative to the base along an optical axis direction of the lens; and a tilt driving unit includes a plurality of first electromagnetic driving portions and a plurality of second electromagnetic driving portions, The first electromagnetic driving portion is disposed on the opposite side of the carrier, the second electromagnetic driving portions are disposed on the frame and correspond to the first electromagnetic driving portions, and the first and second electromagnetic driving portions are An electromagnetic induction is generated to cause the carrier to be tilted relative to the base, wherein the first coil and the first electromagnetic driving portions are disposed on the carrier, and the first line is viewed from the optical axis direction. Overlapped with the plurality of first electromagnetic driving portion. The lens driving device of claim 1, wherein the first electromagnetic driving portions are driving coils having an elliptical structure, and the second electromagnetic driving portions are driving magnets. The lens driving device of claim 2, wherein the focusing The driving unit includes a plurality of first magnetic elements respectively disposed on opposite sides of the frame and corresponding to the driving magnets of the tilt driving unit. The lens driving device of claim 3, wherein the driving magnets are multi-polar magnets, and each of the first magnetic elements and the corresponding ones of the driving magnets form a single multi-polar magnet integrally formed. The lens driving device of claim 4, wherein the multipolar magnet has a plurality of magnetic regions having different sizes in the optical axis direction, and the driving coil corresponding to the multipolar magnet has an upper half And the lower half correspond to the different magnetic regions respectively. The lens driving device of claim 2, wherein the driving directions of the driving coils disposed on opposite sides of the carrier are the same or opposite. The lens driving device of claim 1, further comprising an elastic member connecting the carrier to the frame, wherein the elastic member has a plurality of carrier connection portions for connecting the carrier, and is located at The plurality of bearing bases on opposite sides of the carrier determine at least one axis of rotation of the carrier. The lens driving device of claim 7, wherein the rotating shafts are arranged in a cross shape as viewed from the optical axis direction, and the optical axes pass through intersections of the rotating shafts. The lens driving device of claim 3, wherein the driving magnets are general magnets, and each of the first magnetic elements and the corresponding ones are The driving magnets constitute a single general magnet integrally formed, wherein the general magnet has a single magnetic domain in the optical axis direction, and corresponds to the first coil and a portion of the driving coil. The lens driving device of claim 4, further comprising a substrate disposed on the base, wherein the substrate has a plurality of second coils respectively corresponding to the plurality of polar magnets, and the second Electromagnetic induction is generated between the coil and the plurality of polar magnets to move the frame relative to the base in a direction perpendicular to the optical axis. The lens driving device of claim 9, further comprising a substrate disposed on the base, wherein the substrate has a plurality of second coils respectively corresponding to the general magnets, and the second coils Electromagnetic induction is generated between the general magnets to move the frame relative to the base in a direction perpendicular to the optical axis. The lens driving device of claim 10, wherein the first coil, the first electromagnetic driving portions and the second coils jointly correspond to the plurality of polar magnets or the general magnets. The lens driving device of claim 12, wherein the first coil and each of the first electromagnetic driving portions jointly correspond to one of the plurality of polar magnets or one of the general magnets, and the surface is parallel On the optical axis. The lens driving device of claim 13, wherein each of the second coils corresponds to the other side of each of the plurality of polar magnets or the plurality of general magnets, and the other surface is perpendicular to the optical axis. The lens driving device of claim 1, further comprising a plurality of suspension wires for suspending the frame and the carrier therein. The lens driving device of claim 1, further comprising an elastic member, which is a reed having a plurality of reed portions, wherein the reed portions are electrically connected to the first coil of the focus driving unit And the reed portions are electrically connected to the first electromagnetic driving portions of the tilt driving unit. The lens driving device of claim 8, further comprising a plurality of stopping mechanisms formed between the frame and the carrier, and the stopping mechanisms are arranged in another cross type. The lens driving device of claim 17, wherein the other cross type does not overlap with the cross type in which the rotating shafts are arranged, and has an angle of not zero. The lens driving device of claim 8, wherein the rotating shafts and the second electromagnetic driving portions are parallel or perpendicular to each other in a plane corresponding to the first electromagnetic driving portions.