CN109901276B

CN109901276B - Multi-lens camera system and driving mechanism thereof

Info

Publication number: CN109901276B
Application number: CN201811434172.4A
Authority: CN
Inventors: 郭侲圻; 宋欣忠
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2017-12-07
Filing date: 2018-11-28
Publication date: 2022-08-26
Anticipated expiration: 2038-11-28
Also published as: CN209373236U; CN109901276A

Abstract

The invention relates to a multi-lens camera system and a driving mechanism thereof, wherein the driving mechanism is used for driving an optical element and comprises a fixed module, a movable module and a driving assembly, wherein the movable module is movably connected with the fixed module and bears the optical element, and the driving assembly is arranged on the fixed module and the movable module. The driving assembly includes a magnet and a coil for driving the optical element to move along a first axial direction relative to the fixing module. A central axis of the magnet extends through a portion of the coil and is offset from a central position of the coil, wherein the central axis is perpendicular to the first axial direction.

Description

Multi-lens camera system and driving mechanism thereof

Technical Field

The present invention relates to a driving mechanism, and more particularly, to a driving mechanism for driving an optical element.

Background

With the development of technology, many electronic devices (such as smart phones or digital cameras) have a function of taking pictures or recording videos. The use of these electronic devices is becoming more common and the design direction of these electronic devices is being developed to be more convenient and thinner to provide more choices for users.

In a conventional mobile phone lens, a dual-lens camera system (dual-lens camera system) uses two lens driving mechanisms, which are usually located close to each other, so that magnets located in different lens driving mechanisms are prone to generate magnetic interference (magnetic interference), which may affect the focusing speed and accuracy of the lens. In view of the above, it is an important issue to design a multi-lens camera system (multi-lens system) that can prevent magnetic interference between different lens driving mechanisms.

Disclosure of Invention

In view of the foregoing problems, an embodiment of the present invention provides a driving mechanism for driving an optical device, including a fixed module, a movable module and a driving assembly, wherein the movable module is movably connected to the fixed module and carries the optical device, and the driving assembly is disposed on the fixed module and the movable module. The driving assembly includes a magnet and a coil for driving the optical element to move along a first axial direction relative to the fixing module. A central axis of the magnet extends through a portion of the coil and is offset from a central position of the coil, wherein the central axis is perpendicular to the first axial direction.

In one embodiment, the fixing module has a housing, the coil has an outer section and an inner section, and the central axis extends through the inner section.

In one embodiment, the magnet is disposed on the movable module, and the coil is disposed on the fixed module.

In one embodiment, the movable module has a frame, the frame is movably connected to the fixed module, and the magnet is fixed to the frame.

In an embodiment, the driving assembly further includes a magnetic conductive element disposed on one side of the magnet.

In one embodiment, the magnet is closer to the coil than the magnetic conductive element.

In an embodiment, the driving assembly further includes two magnets, and the magnetic poles of the magnets are arranged in the same direction along a second axial direction, wherein the second axial direction is perpendicular to the first axial direction.

In an embodiment, the driving assembly further includes a magnetic conductive element disposed between the magnets.

In one embodiment, the magnetic conductive element protrudes from one side of the magnet.

In one embodiment, a groove is formed between the magnet and the magnetic conductive element.

In an embodiment, the driving assembly further includes a plurality of magnetic conductive elements disposed between the magnets.

In one embodiment, the magnetic conductive elements and the magnets are staggered along the second axial direction.

In one embodiment, the movable module has a supporting member and a frame, the supporting member supports the optical element and is movably connected to the frame, and the frame is movably connected to the fixed module, wherein the frame has a first groove, a second groove and a rib, the magnets are respectively fixed in the first groove and the second groove, and the rib is located between the magnets.

In one embodiment, the movable module has a supporting member and a frame, the supporting member supports the optical element and is movably connected to the frame, and the frame is movably connected to the fixed module, wherein the frame has a first groove and a second groove, the magnets are respectively fixed in the first groove and the second groove, and the width of the second groove is greater than the width of the first groove.

In an embodiment, the driving assembly further includes a magnetic conductive element disposed between the magnets and located in the second groove.

In one embodiment, the length of the magnetic conductive element is greater than the length of the magnet.

In an embodiment, the driving assembly further includes two coils respectively disposed on the movable module and the fixed module and located at two adjacent sides of the magnet.

In an embodiment, the driving assembly further includes two coils and two magnets, the magnetic poles of the magnets are in the same direction and are arranged along a second axial direction, wherein the second axial direction is perpendicular to the first axial direction, and the coils respectively correspond to the magnets.

An embodiment of the present invention further discloses a multi-lens imaging system, which includes two driving mechanisms as described above, wherein the driving mechanisms are quadrilateral and arranged side by side, and magnets in the driving mechanisms are located on adjacent sides of the driving mechanisms.

An embodiment of the present invention further discloses a multi-lens camera system, which includes the driving mechanism and a camera unit, wherein the camera unit has an optical lens, a plurality of magnetic elements and a winding, the magnetic elements are located at corners of the camera unit, and when the winding is energized, magnetic force is generated between the magnetic elements and the winding to drive the optical lens to move. In particular, the drive mechanism and the imaging unit are arranged along the first axial direction, and the magnetic element and the magnet do not overlap each other in the first axial direction.

In one embodiment, the magnet has a long axis direction, and the length of the magnet in the long axis direction is smaller than the distance between the magnetic elements in the long axis direction.

An embodiment of the present invention further discloses a multi-lens camera system, which comprises a plurality of driving mechanisms as described above, wherein the driving mechanisms are quadrilateral and arranged in a matrix manner, wherein a driving assembly in each driving mechanism further comprises two magnets and two coils corresponding to the magnets, and the magnets are respectively deviated from the center positions of the coils.

Drawings

Fig. 1 shows an exploded view of a drive mechanism 1 according to an embodiment of the invention.

Fig. 2 shows a perspective view of the drive mechanism 1 of fig. 1 in combination.

Fig. 3 shows a cross-sectional view taken along line X1-X1 in fig. 2.

Fig. 4 shows a cross-sectional view taken along line Y1-Y1 in fig. 2.

Fig. 5 is a schematic diagram showing the relative positions of the magnets M1, M2, M3 and the coil C22 inside the circuit board 30.

Fig. 6 is a partially enlarged view of the magnets M1 and M3 and the circuit board 30 in fig. 5.

Fig. 7 is a partially enlarged view of the magnets M1, M3, the coil C1 and the circuit board 30 according to another embodiment of the present invention.

Fig. 8 is a partially enlarged view of the magnets M1, M3, the coil C1 and the circuit board 30 according to another embodiment of the present invention.

Fig. 9 shows an enlarged view in partial cross section when two drive mechanisms 1 are arranged in the X-axis direction.

Fig. 10 shows a top view when two drive mechanisms 1 are arranged in the X-axis direction.

Fig. 11 shows a top view of four drive mechanisms 1 arranged in a matrix.

Fig. 12 is a schematic view showing a magnet M3 provided with a magnetic conductive element P2 on the outer side thereof according to another embodiment of the present invention.

Fig. 13 is an enlarged partial sectional view of the magnet M3, the magnetic conductive element P2 and the circuit board 30 in fig. 12.

Fig. 14 is a schematic view showing a magnetic conductive element P2 provided between two magnets M3 according to another embodiment of the present invention.

Fig. 15 is an enlarged partial sectional view of the magnet M3, the magnetic conductive element P2, and the circuit board 30 in fig. 14.

Fig. 16 is a schematic view showing a groove R formed between two magnets M3 and a magnetic permeable element P2 according to another embodiment of the present invention.

Fig. 17 is a schematic view of two magnetic conductive elements P2 disposed between two magnets M3 according to another embodiment of the present invention.

Fig. 18 is a schematic view showing a magnetic conductive element P2 disposed above two magnets M3 according to another embodiment of the present invention.

Fig. 19 is a schematic view of a dual-lens camera system (dual-lens system) according to another embodiment of the present invention.

Fig. 20 is a schematic view showing that the magnets M1, M2, M3 in the drive mechanism 1 according to another embodiment of the present invention are fixed to the frame 50.

Fig. 21 is a schematic view showing that the magnet M3 in the drive mechanism 1 according to another embodiment of the present invention is fixed to the frame 50.

Wherein the reference numerals are as follows:

drive mechanism 1

Imaging unit 2

Housing 10

Base 20

Conductive terminal 21

Circuit board 30

Carrier 40

Opening 41

Frame 50

First groove 51

Second groove 52

Gap 521

Rib 53

Center line A1

Center position A2

Center axis A3

Winding C

Coils C1, C21, C22

Upper and lower halves C11, C12

Outer section C221

Inner section C222

Length d

Distance D

Gap G

Height H, h

Magnet HM

Sensing element HS

Distance L, L1

Thickness L2

Magnetic element M

Magnets M1, M2, M3

Upper and lower half parts M11, M12

Optical axis O

Magnetic conductive elements P1, P2

Groove R

Upper reed S1

Lower reed S2

Elastic element W

Widths W1, W2

Detailed Description

The following describes a multi-lens imaging system and a driving mechanism thereof according to an embodiment of the present invention. It should be appreciated, however, that the present embodiments provide many suitable inventive concepts that can be embodied in a wide variety of specific contexts. The particular embodiments disclosed are illustrative only of the use of the invention in a particular manner and are not intended to limit the scope of the invention.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of a preferred embodiment, which proceeds with reference to the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are directions with reference to the attached drawings only. Therefore, the directional terms used in the embodiments are used for description and not for limiting the present invention.

Referring to fig. 1 to 4 together, fig. 1 shows an exploded view of a driving mechanism 1 according to an embodiment of the present invention, fig. 2 shows a perspective view of the driving mechanism 1 of fig. 1 after assembly, fig. 3 shows a cross-sectional view taken along line X1-X1 of fig. 2, and fig. 4 shows a cross-sectional view taken along line Y1-Y1 of fig. 2. It should be understood that the driving mechanism 1 of the present embodiment is, for example, a Voice Coil Motor (VCM), which can be installed inside a mobile phone or other portable electronic devices to drive an Optical element (e.g., an Optical lens) to move, so as to realize functions such as Auto Focusing (AF) or Optical Image Stabilization (OIS).

As shown in fig. 1, the driving mechanism 1 mainly includes a housing 10, a base 20, a circuit board 30, a supporting member 40, a frame 50, an upper spring S1 and a lower spring S2. In this embodiment, the housing 10 has a hollow structure and is combined with the base 20, and the circuit board 30 is fixed on the base 20, wherein the housing 10, the base 20 and the circuit board 30 can form a fixed module; in addition, the carrier 40 and the frame 50 are movably accommodated in the housing 10, and an optical element (not shown) is disposed in the opening 41 of the carrier 40, wherein the frame 50, the carrier 40 and the optical element disposed therein constitute a movable module capable of moving relative to the fixed module.

Specifically, the bearing component 40 is connected to the frame 50 through the upper and lower reeds S1, S2, so that the bearing component 40 can be movably suspended inside the frame 50; in addition, the base 20 connects the frame 50 and the upper spring S1 through four elastic elements W, so that the frame 50 can be movably accommodated in the housing 10. In one embodiment, the upper and lower reeds S1, S2 may be made of metal, and the elastic element W may be an elongated metal member.

With the above-mentioned arrangement, external light can enter the driving mechanism 1 along the optical axis O of the optical element, and the light passes through the optical lens and reaches an image sensing element (not shown) located below the base 20, thereby generating a digital image.

It should be noted that the frame 50, the supporting member 40 and the optical components disposed therein can move along a first axial direction relative to the base 20 and the circuit board 30, wherein the first axial direction is parallel to the XY plane, thereby achieving the optical hand-shake protection (OIS); in addition, the supporting member 40 and the optical element disposed therein can move along a second axial direction (Z-axis direction) relative to the frame 50, wherein the second axial direction is parallel to the optical axis O direction of the optical element, so as to realize the function of auto-focusing (AF).

With reference to fig. 1, 3 and 4, an oval coil C1 is disposed on the opposite side of the carrier 40, coils C21 and C22 are embedded in four sides of the circuit board 30, and a plurality of magnets M1, M2 and M3 are disposed on four inner surfaces of the rectangular frame 50. In the present embodiment, the magnets M1 and M2 are, for example, multipolar magnets (multipolar magnets), wherein the position of the magnet M1 corresponds to the coil C1 on the carrier 40 and the coil C21 inside the circuit board, and the positions of the magnets M2 and M3 correspond to the coil C22 inside the circuit board, respectively. For example, the coils C21 and C22 are planar coils (planar coils) or micro coils (FP-coils), and can be electrically connected to the conductive terminals 21 under the base 20 through a circuit.

The upper spring S1 can be electrically connected to the coil C1 through a conductive wire, and two ends of the four elastic elements W are respectively connected to the conductive wire on the base 20 and the upper spring S1, so that an external circuit electrically connected to the conductive terminals 21 under the base 20 can provide an electric current to the coil C1 on the carrier 40. When a current is applied to the coil C1, the carrier 40 and the optical element can be driven to move in the Z-axis direction (second axial direction) relative to the frame 50 by the magnetic force generated between the coil C1 and the magnet M1, so as to realize the function of Auto Focus (AF).

Similarly, the external circuit can also provide current to the coils C21 and C22 in the circuit board 30 through the conductive terminals 21 under the base 20. When an electric current is applied to the coils C21 and C22, the frame 50, the carrier 40 and the optical element disposed therein may be driven to move together in a horizontal direction (a first axial direction) relative to the base 20 and the circuit board 30 by a magnetic force generated between the coils C21 and C22 and the magnets M2 and M3, so as to achieve an optical hand-shake (OIS) prevention function.

In addition, as can be seen from fig. 1, a magnetic conductive element P1 and a magnet HM fixed on the frame 50 are further disposed above the magnet M2, and a magnetic field sensing element HS electrically connected to the upper reed S1 is disposed at one side of the supporting member 40 for sensing the magnet HM, wherein the magnetic conductive element P1 can improve the magnetic field distribution near the magnet M2 to reduce the magnetic interference between the magnet M2 and other magnetic elements. For example, the magnetic field sensing element HS can be a Hall sensor (Hall effect sensor), a magnetic resistance sensor (MR sensor), or a magnetic flux sensor (Fluxgate), etc. for sensing the position of the magnet HM, so as to obtain the relative position change between the supporting member 40 and the frame 50 in the Z-axis direction.

Next, referring to fig. 4 and 5, fig. 5 is a schematic diagram illustrating a relative position relationship between the magnets M1, M2, M3 and the coil C22 inside the circuit board 30. As shown in fig. 4 and 5, in the driving mechanism 1 of the present embodiment, two magnets M3 are disposed on the right side of the carrier 40, the two magnets M3 are arranged along the Z-axis direction, their heights substantially correspond to the upper and lower halves M11 and M12 of the magnet M1, and their magnetic pole directions (N-S) are both parallel to the Z-axis direction (second axis direction). It should be noted that the magnet M2 on the left side of fig. 5 corresponds to both the outer section C221 and the inner section C222 of the coil C22, and the magnet M3 on the right side of fig. 5 is closer to the inner section C222 of the coil C22, wherein the outer section C221 is closer to the housing 10 than the inner section C222.

Referring to fig. 6, in which fig. 6 shows a partially enlarged view of the magnets M1 and M3 and the circuit board 30 in fig. 5. As can be seen from fig. 6, the height of the magnet M1 is slightly higher than the height of the two magnets M3, i.e., the height H > the height H, and a center line a1 of the magnet M1 passes through the gap G between the two magnets M3. It should be understood that, in order to avoid the magnet M3 being too close to the edge of the driving mechanism 1 and affecting the electronic or magnetic components outside the driving mechanism 1, the magnet M3 in this embodiment is offset from the central position a2 of the coil C22, and the central axis A3 of the magnet M3 extends through the inner section C222 of the coil C22 (as shown in fig. 6).

Fig. 7 is a partially enlarged view of the magnets M1, M3, the coil C1 and the circuit board 30 according to another embodiment of the present invention, wherein the embodiment of fig. 7 is different from that of fig. 6 mainly in that: in the embodiment of fig. 7, an elliptical coil C1 is additionally provided, wherein the elliptical coil C1 is fixed on the carrier 40 and corresponds to the higher of the two magnets M3 aligned along the Z-axis.

It should be noted that the elliptic coil C1 in fig. 7 has an upper half C11 and a lower half C12, wherein the distance L1 between the center positions of the upper and lower halves C11 and C12 is greater than the thickness L2 of the magnet M3. In this way, when a current is applied to the coil C1, the carrier 40 and the optical element disposed therein are driven to move along the Z-axis (second axis) relative to the frame 50 by the magnetic force generated between the coil C1 and the magnet M3, so as to achieve the function of auto-focusing (AF).

Fig. 8 is a partially enlarged view of the magnets M1, M3, the coil C1 and the circuit board 30 according to another embodiment of the present invention, wherein the embodiment of fig. 8 is different from the embodiment of fig. 7 mainly in that: in fig. 8, only one magnet M3 is provided, and the position of the elliptical coil C1 corresponds to the magnet M3, wherein the coils C1 and C22 are located at two adjacent sides of the magnet M3.

In the present embodiment, the distance L1 between the center positions of the upper and lower halves C11 and C12 of the elliptical coil C1 is also greater than the thickness L2 of the magnet M3, and when a current is applied to the coil C1, a magnetic force is generated between the coil C1 and the magnet M3 to drive the supporting member 40 and the optical element disposed therein to move along the Z-axis direction (second axial direction) relative to the frame 50, so as to achieve the auto-focusing (AF) function. In addition, when an electric current is applied to the coil C22 in the circuit board 30, the frame 50, the carrier 40 and the optical element disposed therein are driven to move together in a horizontal direction relative to the base 20 and the circuit board 30 by the magnetic force generated between the coil C22 and the magnet M3, so as to achieve an optical hand-shake prevention (OIS) function.

Referring to fig. 9 and 10 together, fig. 9 is a partially enlarged sectional view of the two driving mechanisms 1 arranged along the X-axis direction, and fig. 10 is a top view of the two driving mechanisms 1 arranged along the X-axis direction. As shown in fig. 9 and 10, the present invention can also be applied to a dual-lens camera system (dual-lens system) in which two driving mechanisms 1 are arranged side by side along a first axial direction (X-axis direction). It should be understood that the two driving mechanisms 1 of the present embodiment are substantially quadrilateral, and the magnets M3 inside the two driving mechanisms 1 are located at the sides of the two driving mechanisms 1 adjacent to each other, since the two magnets M3 are both deviated from the center position of the coil C22 below the two magnets M3 toward the inner side of the driving mechanism 1, the distance L between the two magnets M3 can be effectively increased, thereby preventing the magnets M3 inside the two adjacent driving mechanisms 1 from being too close to each other to generate magnetic interference.

Referring next to fig. 11, fig. 11 shows a top view of four driving mechanisms 1 arranged in a matrix. As shown in fig. 11, the present invention can also apply four driving mechanisms 1 arranged in a matrix manner to a four-lens imaging system (four-lens camera system), wherein each of the driving mechanisms 1 is provided with at least two magnets M3 as shown in any one of fig. 1-9, and the two magnets M3 are respectively located at adjacent sides of the driving mechanism 1, wherein all the magnets M3 are offset from the center position of the coil C22 below the driving mechanism 1 in the inner direction; in this way, by effectively increasing the distance between the magnets M3 in the adjacent driving mechanisms 1, it is possible to prevent the magnets M3 in the adjacent driving mechanisms 1 from being too close to each other and causing magnetic interference.

Next, referring to fig. 12 and fig. 13, in which fig. 12 shows a schematic view of a magnet M3 provided with a magnetic conductive element P2 at the outer side thereof according to another embodiment of the present invention, and fig. 13 shows an enlarged partial cross-sectional view of the magnet M3, the magnetic conductive element P2 and the circuit board 30 in fig. 12. As shown in fig. 12 and 13, in the driving mechanism 1 of the present embodiment, a magnetic conductive element P2 may be disposed outside the magnet M3, wherein the magnetic conductive element P2 is disposed to further concentrate the magnetic field distribution around the magnet M3, so as to effectively prevent the magnet M3 from generating magnetic interference with electronic or magnetic elements inside or outside the driving mechanism 1.

Next, referring to fig. 14 and fig. 15, in which fig. 14 illustrates a schematic view of a magnetic conductive element P2 disposed between two magnets M3 according to another embodiment of the present invention, and fig. 15 illustrates an enlarged partial cross-sectional view of the magnet M3, the magnetic conductive element P2 and the circuit board 30 in fig. 14. As shown in fig. 14 and 15, in the driving mechanism 1 of the present embodiment, two magnets M3 are provided, and a magnetic conductive element P2 is further provided between the two magnets M3, wherein the magnetic conductive element P2 is provided to further concentrate the magnetic field distribution around the two magnets M3, and effectively prevent the magnet M3 from generating magnetic interference with the electronic or magnetic elements inside or outside the driving mechanism 1. In addition, since the magnetic conductive element P2 slightly protrudes from the outer surface of the two magnets M3, the magnetic conductive element P2 can be used as a locking structure or a limiting structure for positioning during assembly.

Referring to fig. 16, fig. 16 is a schematic diagram of a groove R formed between two magnets M3 and a magnetic conductive element P2 according to another embodiment of the present invention. The present embodiment is mainly different from the embodiments of fig. 14 and 15 in that: in the present embodiment, a groove R is formed between the two magnets M3 and the magnetic conductive element P2, wherein the groove R can be used as a fastening structure or a limiting structure to facilitate positioning during assembly; alternatively, the aforementioned groove R may be used to accommodate a glue, so that the magnet M3, the magnetic conductive element P2 and the frame 50 can be adhered and fixed to each other.

Referring to fig. 17, fig. 17 is a schematic diagram illustrating two magnetic conductive elements P2 disposed between two magnets M3 according to another embodiment of the present invention. The present embodiment is mainly different from the embodiment of fig. 16 in that: in the embodiment, a plurality of magnetic conductive elements P2 are disposed between the two magnets M3, wherein the magnetic conductive elements P2 are aligned with the inner surface of the magnet M3 and protrude from the outer surface of the magnet M3.

It should be understood that, in the present embodiment, by disposing two or more magnetic conductive elements P2 between two magnets M3, in addition to making the magnetic field distribution around the magnet M3 more concentrated to prevent the magnet M3 from generating magnetic interference on electronic or magnetic elements inside or outside the driving mechanism 1, and when the driving mechanism 1 is applied to a multi-lens camera system (multi-lens camera system), the height h of two magnets M3 in the Z-axis direction can be adjusted by changing the number of the magnetic conductive elements P2, so that the height positions of the magnets M3 inside two adjacent driving mechanisms 1 are made to correspond, and the effect of making the horizontal magnetic forces cancel each other and keeping the resultant force balanced can be achieved.

Referring to fig. 18, in fig. 18, a schematic view of a magnetic conductive element P2 is respectively disposed above two magnets M3 according to another embodiment of the invention. The present embodiment is mainly different from the embodiment of fig. 17 in that: in this embodiment, the two magnets M3 are both provided with a magnetic conductive element P2, and the magnets M3 and the magnetic conductive elements P2 are arranged alternately along the Z-axis direction (second axial direction), wherein the lower magnet M3 is closer to the coil C22 than the magnetic conductive element P2, the number of the magnetic conductive elements P2 arranged above the single magnet M3 is not limited to one, and a plurality of magnetic elements P2 can be stacked on the upper surface of any one magnet M3.

It should be understood that, in the embodiment, by providing at least one magnetic conductive element P2 above both the two magnets M3, in addition to making the magnetic field distribution around the magnet M3 more concentrated to prevent the magnet M3 from generating magnetic interference on electronic or magnetic elements inside or outside the driving mechanism 1, when more than two driving mechanisms 1 are applied to a multi-lens camera system (multi-lens camera system), the positions and overall heights of the two magnets M3 and the magnetic conductive elements P2 in the Z-axis direction can be adjusted by changing the number of the magnetic conductive elements P2, so as to improve the overall performance of the driving mechanism 1 itself and the multi-lens camera system.

Referring to fig. 19, fig. 19 is a schematic diagram of a dual-lens camera system according to another embodiment of the invention. As shown in fig. 19, the dual-lens imaging system of the present embodiment includes the driving mechanism 1 and the imaging unit 2 of any of the foregoing embodiments arranged along the X-axis direction (first axial direction), wherein four magnetic elements M and a winding C are disposed inside the imaging unit 2, and when the winding C is energized, a magnetic force is generated between the magnetic elements M and the winding C to drive an optical lens disposed inside the imaging unit 2 to move along the Z-axis direction.

It should be noted that the magnetic elements M inside the camera unit 2 are disposed at four corners of the rectangular housing, and the magnets M1, M2, M3 inside the driving mechanism 1 are disposed at four sides of the rectangular housing, wherein the magnet M3 can be disposed as shown in any one of fig. 1 to 18, and the length D of the magnet M3 in the long axis direction (Y axis direction) is smaller than the distance D between two adjacent magnets M inside the driving mechanism 2 in the long axis direction (Y axis direction), and the magnet M3 is offset from the center position of the coil C22 below the magnet M.

Furthermore, when viewed along the X-axis direction (first axial direction), it can be seen that the magnetic element M inside the camera unit 2 does not overlap the magnet M3 inside the driving mechanism 1, thereby ensuring that a sufficient distance is maintained between the magnet M3 inside the driving mechanism 1 and the magnet M inside the camera unit 2 to avoid magnetic interference therebetween.

Referring to fig. 20, fig. 20 is a schematic view of magnets M1, M2, M3 fixed on the frame 50 in the driving mechanism 1 according to another embodiment of the present invention. As shown in fig. 20, in the driving mechanism 1 of the present embodiment, the magnets M1, M2, M3 are fixed to the four inner side surfaces of the frame 50 by insert molding (insert molding), wherein two magnets M3 are arranged along the Z-axis direction and are respectively inserted into the first groove 51 and the second groove 52 of the frame 50, and the two magnets M3 are separated by a rib 53 of the frame 50.

Referring to fig. 21, fig. 21 is a schematic view illustrating that the magnet M3 inside the driving mechanism 1 is fixed on the frame 50 according to another embodiment of the present invention. As shown in fig. 21, in the driving mechanism 1 of the present embodiment, two magnets M3 are respectively assembled in the first groove 51 and the second groove 52 of the frame 50, and at least one magnetic conductive element P2 is disposed between the two magnets M3.

It should be noted that the first groove 51 and the second groove 52 have widths W1 and W2, respectively, wherein the width W1 is substantially equal to the length of the two magnets M3, the width W2 is substantially equal to the length of the magnetic conductive element P2, and the width W2 is greater than the width W1. During assembly, the upper magnet M3 and the magnetic conductive element P2 can be placed in the second groove 52 with a width larger than that of the first groove 51, and then glue is applied to the gap 521 at two sides of the magnet M3 to ensure that the magnet M3 and the magnetic conductive element P2 can be firmly combined with the predetermined position on the frame 50, thereby greatly improving the assembly accuracy and the convenience during assembly.

In summary, the magnet M3 in the embodiments of the present invention can form a driving assembly with the coil C22 to drive the movable module to move in the horizontal direction relative to the fixed module, wherein the magnet M3 has the characteristic of deviating from the center of the coil C22 therebelow, so when more than two driving mechanisms 1 are applied to a multi-lens camera system (multi-lens camera system), the magnetic interference caused by too close proximity between the magnets M3 in adjacent driving mechanisms 1 can be avoided. For example, only one magnet M3 may be disposed inside the driving mechanism 1, or two or more magnets M3 may be disposed along the vertical direction, or one or more magnetic conductive elements P2 may be disposed on the surface of the magnet M3 and jointly form a driving assembly, so as to greatly improve the overall performance of the driving mechanism 1 and the multi-lens imaging system.

Although the embodiments of the present invention and their advantages have been disclosed, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but it is to be understood that any process, machine, manufacture, composition of matter, means, method and steps, presently existing or later to be developed, that will operate in accordance with the present application, and that all such modifications, machines, manufacture, compositions of matter, means, methods and steps, if any, can be made to the present application without departing from the scope of the present application. Accordingly, the scope of the present application includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described above. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present invention also includes combinations of the respective claims and embodiments.

Although the present invention has been described with respect to one or more embodiments thereof, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims

1. A driving mechanism for driving an optical element, comprising:

a fixed module;

a movable module, movably connected with the fixed module and carrying the optical element; and

and a driving assembly disposed on the fixed module and the movable module, wherein the driving assembly includes a magnet and a coil, the magnet is offset from a center of the coil, and a central axis of the magnet extends through a portion of the coil to drive the optical element to move along a first axial direction relative to the fixed module, wherein the central axis is perpendicular to the first axial direction, and the central axis of the magnet is closer to a center of the driving mechanism than the center of the coil.

2. The driving mechanism as claimed in claim 1, wherein the fixing module has a housing, and the coil has an outer section and an inner section, the outer section is closer to the housing than the inner section, and the central axis extends through the inner section.

3. The driving mechanism as claimed in claim 1, wherein the magnet is disposed on the movable module and the coil is disposed on the fixed module.

4. The driving mechanism of claim 1, wherein the movable module has a carrier and a frame, the carrier carries the optical element and is movably connected to the frame, and the frame is movably connected to the fixed module, wherein the magnet is fixed to the frame.

5. The drive mechanism of claim 1, wherein the drive assembly further comprises a magnetically permeable element disposed on one side of the magnet.

6. The drive mechanism of claim 5, wherein the magnet is closer to the coil than the magnetic conductive element.

7. The drive mechanism of claim 1, wherein the drive assembly further comprises two magnets having magnetic poles in the same direction and aligned along a second axis, wherein the second axis is perpendicular to the first axis.

8. The drive mechanism of claim 7, wherein the drive assembly further comprises a magnetically permeable element disposed between the magnets.

9. The drive mechanism of claim 8, wherein the magnetically permeable element protrudes from one side of the magnet.

10. The drive mechanism of claim 8, wherein a recess is formed between the magnet and the magnetically permeable element.

11. The drive mechanism of claim 7, wherein the drive assembly further comprises a plurality of magnetically permeable elements disposed between the magnets.

12. The drive mechanism of claim 7, wherein the drive assembly further comprises a plurality of magnetically permeable elements, the magnetically permeable elements being staggered from the magnets along the second axial direction.

13. The driving mechanism of claim 7, wherein the movable module has a supporting member and a frame, the supporting member supports the optical element and is movably connected to the frame, and the frame is movably connected to the fixed module, wherein the frame is formed with a first groove, a second groove and a rib, the magnets are respectively fixed in the first groove and the second groove, and the rib is disposed between the magnets.

14. The driving mechanism of claim 7, wherein the movable module has a supporting member and a frame, the supporting member supports the optical element and is movably connected to the frame, and the frame is movably connected to the fixed module, wherein the frame has a first groove and a second groove, the magnets are fixed in the first groove and the second groove, respectively, and the width of the second groove is greater than the width of the first groove.

15. The drive mechanism of claim 14, wherein the drive assembly further comprises a magnetic conductive element disposed between the magnets and within the second recess.

16. The drive mechanism of claim 15, wherein the length of the magnetically permeable element is greater than the length of the magnet.

17. The driving mechanism as claimed in claim 1, wherein the driving assembly further comprises two coils respectively disposed on the movable module and the fixed module and located at two adjacent sides of the magnet.

18. The driving mechanism as claimed in claim 1, wherein the driving assembly further comprises two coils and two magnets, the coils are respectively disposed on the movable module and the fixed module and respectively correspond to the magnets, the magnetic poles of the magnets have the same direction and are arranged along a second axial direction, wherein the second axial direction is perpendicular to the first axial direction.

19. A multi-lens camera system, comprising:

two drive mechanisms according to claim 1, wherein the drive mechanisms are quadrilateral and arranged side by side, and the magnets in the drive mechanisms are located on the sides of the drive mechanisms that are adjacent to each other.

20. A multi-lens camera system, comprising:

a drive mechanism as recited in claim 1; and

the camera shooting unit is provided with an optical lens, a plurality of magnetic elements and a winding, wherein the magnetic elements are positioned at the corners of the camera shooting unit, and when the winding is electrified, magnetic force is generated between the magnetic elements and the winding to drive the optical lens to move;

the driving mechanism and the camera unit are arranged along the first axial direction, and the magnetic element and the magnet are not mutually overlapped in the first axial direction.

21. The system of claim 20, wherein the magnet has a long axis direction, and the length of the magnet in the long axis direction is smaller than the pitch of the magnetic elements in the long axis direction.

22. A multi-lens camera system, comprising:

four drive mechanisms according to claim 1, wherein the drive mechanisms are quadrilateral and arranged in a matrix, wherein the drive assembly of each drive mechanism further comprises two magnets and two coils corresponding to the magnets, and the magnets are respectively offset from the central positions of the coils.