CN111580238B

CN111580238B - Lens driving module

Info

Publication number: CN111580238B
Application number: CN202010484868.9A
Authority: CN
Inventors: 游证凯; 范振贤; 胡朝彰; 陈树山; 翁智伟
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2016-07-12
Filing date: 2017-05-16
Publication date: 2022-07-12
Anticipated expiration: 2037-05-16
Also published as: CN107608052B; CN111596433A; CN111580239B; CN111580238A; CN111596433B; CN107608052A; CN111580239A

Abstract

The present disclosure provides a lens driving module, which includes a reflection assembly, a base, a frame, a carrier, an optical lens, a first electromagnetic driving assembly, and a second electromagnetic driving assembly. The frame is connected with the base, the bearing piece bears the optical lens and is movably connected with the base, the reflection assembly reflects light rays from the outside to the optical lens along a first direction after reflecting the light rays from a light incidence direction, and the light incidence direction is perpendicular to the first direction. The first and second electromagnetic driving assemblies are used for driving the bearing member and the optical lens to move relative to the base, wherein the first and second electromagnetic driving assemblies are located at different positions in the light incidence direction.

Description

Lens driving module

The application is a divisional application of a Chinese patent application with the application date of 2017, 5, month and 16, the application number of 2017103433997 and the name of the invention creation of the lens driving module.

Technical Field

The present disclosure relates to a lens driving module, and more particularly, to a lens driving module having a plurality of electromagnetic driving units at different height positions.

Background

With the development of technology, many electronic devices (such as tablet computers or smart phones) are equipped with a lens module to have a function of taking pictures or recording videos. When a user uses an electronic device equipped with a lens module, the electronic device may shake, and an image captured by the lens module may be blurred. However, the requirement for image quality is increasing, so the anti-vibration function of the lens module is becoming more and more important.

Disclosure of Invention

The invention provides a lens driving module, which comprises a reflecting component, a base, a frame, a bearing component, an optical lens, a first electromagnetic driving component and a second electromagnetic driving component. The frame is connected with the base, the bearing piece bears the optical lens and is movably connected with the base, the reflection assembly reflects light rays from the outside to the optical lens along a first direction after reflecting the light rays from a light incidence direction, and the light incidence direction is perpendicular to the first direction. The first and second electromagnetic driving assemblies are used for driving the bearing member and the optical lens to move relative to the base, wherein the first and second electromagnetic driving assemblies are located at different positions in the light incidence direction.

In an embodiment, the first electromagnetic driving assembly drives the carrier and the optical lens to move along a first direction, and the second electromagnetic driving assembly drives the carrier and the optical lens to move along a second direction, wherein the first direction is perpendicular to the second direction.

In an embodiment, a distance is formed between the first electromagnetic driving element and the second electromagnetic driving element in the light incident direction, and the distance is smaller than a diameter of the optical lens.

In an embodiment, the first electromagnetic driving assembly is disposed on the base and the supporting member, and the second electromagnetic driving assembly is disposed on the frame and the supporting member.

In an embodiment, the first electromagnetic driving assembly has a first driving coil, and the second electromagnetic driving assembly has a second driving coil, wherein the first driving coil and the second driving coil have strip-shaped structures and respectively extend toward a second direction and a first direction, and the first direction is perpendicular to the second direction.

In one embodiment, the optical lens has a plane perpendicular to the incident direction of light.

In an embodiment, the lens driving module further includes a rolling component movably connected to the supporting component and the base.

In an embodiment, the lens driving module further includes two grooves respectively formed on the base and the carrier and accommodating the rolling assembly.

In an embodiment, the two grooves have strip-shaped structures and extend along a first direction and a second direction respectively, wherein the first direction is perpendicular to the second direction.

In an embodiment, the lens driving module further includes an elastic component movably connecting the supporting component and the base.

In an embodiment, the carrier has a C-shaped structure, and two ends of the C-shaped structure respectively have an inclined plane inclined with respect to the light incident direction.

In an embodiment, three contact areas separated from each other are formed between the carrier and the optical lens.

In an embodiment, the lens driving module further includes a circuit board, the circuit board has an opening, and the base has a recess structure and is accommodated in the opening.

In an embodiment, the lens driving module further includes a plurality of circuit boards connected to the base and separated from each other, wherein a portion of the carrier is accommodated in a gap between the circuit boards.

In an embodiment, the lens driving module further includes a conductor embedded in the base and electrically connected to the plurality of circuit boards.

The present invention provides a lens driving module, which can be disposed in an electronic device and includes a lens unit, a reflective component and at least one connecting component, wherein the lens unit includes an optical lens, a carrier, a frame, a base, a first electromagnetic driving component and a second electromagnetic driving component. The reflection assembly is used for reflecting light from the outside and passing through the lens unit to the photosensitive assembly in the electronic device to obtain an image, the frame is fixed on the base, and the connecting piece can be a rolling assembly or a flexible elastic assembly and is connected with the bearing piece and the base. The first electromagnetic driving component is arranged on the base and the bearing component, the second electromagnetic driving component is arranged on the frame and the bearing component, the first and second driving components drive the bearing component and the optical lens to move relative to the base/frame, wherein the first and second driving components are positioned at different positions in the light incidence direction, so that the mutual interference between the two electromagnetic driving components in the lens unit can be reduced, the magnetic thrust can be effectively improved, the bearing component and the optical lens can translate relative to the base/frame along a plurality of different directions perpendicular to the light incidence direction, good optical focusing or compensation can be realized, and the optical lens is not overlapped with a circuit board in the base, so that the whole volume of the lens driving film group can be reduced.

Drawings

Fig. 1 is a schematic diagram illustrating a lens driving module according to an embodiment of the invention.

Fig. 2 is an exploded view showing the lens unit in fig. 1.

Fig. 3 is a schematic view showing the assembled lens unit of fig. 2.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

FIG. 5 is a schematic diagram illustrating the first unit U1, the second unit U2 and the rolling assembly B.

Fig. 6 is a bottom view showing the base and the circuit board in fig. 5.

Fig. 7 is a schematic view illustrating an optical lens and a carrier according to another embodiment of the invention.

Fig. 8 is an exploded view showing a lens unit according to another embodiment of the present invention.

Fig. 9 is a schematic view showing the assembled lens unit of fig. 8.

Fig. 10 is a bottom view illustrating the base 10', the circuit boards F1, F2, and the rolling assembly B of fig. 8 in combination.

Fig. 11 is an exploded view showing a lens unit according to another embodiment of the present invention.

Fig. 12 is a sectional view showing the lens unit of fig. 11 assembled.

Wherein the reference numerals are as follows:

1, a lens driving module;

10. 10' a base;

101 a concave structure;

20 a frame;

30. 30', 30 "carrier;

31 a bevel;

301 lower surface;

A-A line segment;

b, rolling the component;

c1, C2 first and second drive coils;

CA1, CA2, CA3 contact area;

first and second directions D1 and D2;

e1, E2, E3, E4 electrical conductors;

F. f1, F2 circuit boards;

f101 opening;

h1 and H2 para-position components;

l, L' optical lens;

l '101, L' 102 plane;

m1, M2 first and second magnetic components;

MC1, MC2 electromagnetic drive assembly;

n distance;

a P reflection component;

the Q light incidence direction;

RI, RII groove;

s, an elastic component;

an SF reed;

UL, UL2, UL3 lens units.

U1, U3 first cell;

u2, U4, U6 second cell.

Detailed Description

The following describes a lens driving module 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 specific embodiments disclosed are merely illustrative of specific ways to make and use the invention, and do not delimit 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.

Fig. 1 is a schematic diagram illustrating a lens driving module 1 according to an embodiment of the invention. The lens driving module 1 may be disposed inside an electronic device (e.g., a camera, a tablet computer, or a mobile phone), and includes a lens unit UL and a reflective element P. When light from the outside enters the lens driving module 1 along a light incident direction Q (Z axis), the light is reflected from the light incident direction Q and enters an optical lens L of the lens unit UL along a first direction D1(X axis) through a reflection component P (e.g. prism, mirror) of the lens driving module 1, so that the light can pass through the optical lens L to a photosensitive component (not shown) in the electronic device to obtain an image.

It should be noted that the optical axis (substantially parallel to the X axis) of the optical lens L is substantially perpendicular to the light incident direction Q, so that each component of the lens unit UL can be disposed along the direction parallel to the X axis, and the thickness of the electronic device in the Z axis direction can be greatly reduced, thereby achieving miniaturization.

The optical lens L of the lens unit UL can move relative to the photosensitive element in the electronic device, so as to properly adjust the focal length of the optical lens L, thereby achieving the Auto-Focusing (AF) effect and further improving the image quality. The structure of the lens driving unit UL will be described in detail below.

Referring to fig. 2 and 3 together, fig. 2 is an exploded view of the lens unit UL shown in fig. 1, and fig. 3 is an assembled schematic view of the lens unit UL shown in fig. 2. The lens unit UL includes a first unit U1, a second unit U2, and a plurality of rolling elements B (connecting members), wherein the rolling elements B connect the first and second units U1 and U2. The first and second units U1 and U2 mainly include: a base 10, a circuit board F, a frame 20, a carrier 30, a first electromagnetic driving component MC1, a second electromagnetic driving component MC2 and an optical lens L. The frame 20 is disposed on the base 10 and fixed to each other, and the supporting members 30 are also disposed on the base 10 and connected to each other through the rolling members B for supporting the optical lens L. As shown in fig. 2-3, the first electromagnetic driving component MC1 includes a plurality of first driving coils C1 and a plurality of first magnetic components M1 (e.g., magnets) respectively disposed on the chassis 10 and the carrier 30, wherein a driving signal (e.g., a current) can be applied to the first driving coils C1 by an external power source to drive the carrier 30 and the optical lens L to move relative to the frame 20/the chassis 10; in addition, the second electromagnetic driving assembly MC2 includes a plurality of second driving coils C2 and a plurality of second magnetic assemblies M2 (e.g., magnets) respectively disposed on the frame 20 and the carrier 30, wherein the second driving coils C2 can be applied with driving signals by an external power source to drive the carrier 30 and the optical lens L to move relative to the frame 20/the base 10. The first and second electromagnetic driving components MC1 and MC2 drive the Optical lens L to move relative to the frame 20/base 10, so as to achieve the effect of Optical Image Stabilization (OIS).

With regard to the detailed structure of the first and second electromagnetic driving components MC1 and MC2, please refer to fig. 3 and 4 together, wherein fig. 4 is a sectional view taken along line a-a in fig. 3. The first and second magnetic assemblies M1, M2 are respectively disposed (or embedded) on the lower and upper surfaces of the carrier 30, the first and second driving coils C1, C2 are respectively disposed on the base 10 and the frame 20, and the first and second magnetic assemblies M1, M2 correspondingly face the first and second driving coils C1, C2, so as to jointly form the first and second electromagnetic driving assemblies MC1, MC2 capable of driving the carrier 30 and the optical lens L to move. In the present embodiment, at least one first and one second electromagnetic driving assemblies MC1 and MC2 (fig. 4) are respectively disposed on the left and right sides of the optical lens L, so that the carrier 30 and the optical lens L can stably move relative to the base 10/frame 20.

It should be understood that the positions of the first driving coil C1, the first magnetic assembly M1, the first driving coil C2 and the first magnetic assembly M2 are not limited to the above embodiments. For example, in another embodiment, the first and second magnetic elements M1, M2 may be respectively disposed on the base 10 and the frame 20, and the first and second driving coils C1, C2 may be disposed on the supporting element 30.

In addition, as shown in fig. 4, the supporting member 30 has a C-shaped structure, and two ends of the C-shaped structure respectively have a slope 31 (inclined with respect to the Z-axis), and the two slopes 31 can facilitate the assembly, bonding or adhesion of the supporting member 30 with other components.

The movement of the optical lens L will be described in detail below. When an appropriate driving signal is applied to the first electromagnetic driving module MC1, the first electromagnetic driving module MC1 can drive the carrier 30 and the optical lens L to translate along the first direction D1 (substantially parallel to the X axis) relative to the base 10/frame 20; similarly, when appropriate driving signals are applied to the second electromagnetic driving component MC2, the carrier 30 and the optical lens L can be translated along a second direction D2 (substantially parallel to the Y axis) relative to the base 10/frame 20. In this way, the supporting element 30 and the optical lens L can move in two different directions D1 and D2 on the XY plane, so that the lens driving module 1 has a better vibration compensation effect. In addition, in the Z-axis direction (light incidence direction Q), since the first and second electromagnetic driving components MC1 and MC2 are located at different heights, the problem of mutual electromagnetic interference along the same plane can be reduced or avoided, and the magnetic thrust generated by the electromagnetic driving components MC1 and MC2 in the lens unit UL for driving the optical lens L can be effectively increased. In addition, since a distance N is formed between the first and second electromagnetic driving components MC1 and MC2 in the Z-axis direction, which is smaller than the diameter of the optical lens L, the height of the lens unit UL in the Z-axis direction can be reduced, thereby reducing the overall volume.

It should be noted that, as shown in fig. 5, the upper surface of the base 10 is formed with a plurality of grooves RI, and the lower surface 301 of the carrier 30 is formed with a plurality of grooves RII, the plurality of grooves RI, RII are correspondingly used for accommodating a portion of the plurality of rolling assemblies B and guiding the rolling assemblies B to roll. In the present embodiment, the grooves RI and the guiding grooves RII have an elongated structure, the long axis of the groove R1 extends along a first direction D1 (substantially parallel to the X axis), and the long axis of the groove RII extends along a second direction D2 (substantially parallel to the Y axis), wherein the first direction D1 is substantially perpendicular to the second direction D2. In this way, the rolling assembly B can smoothly roll along the first and second directions D1 and D2 on the XY plane to guide the optical lens L and the carrier 30 to translate along the first and second directions D1 and D2 relative to the base 10/frame 20, so that the lens unit UL can have at least two-dimensional vibration compensation effect. In addition, the first driving coil C1 and the second driving coil C2 also have a strip-shaped structure and extend in the second and first directions D2 and D1, respectively.

Referring to fig. 4-5, the lens unit UL further includes two pairs of first and second alignment assemblies H1 and H2, wherein the first and second alignment assemblies H1 and H2 are respectively disposed on the upper surface of the base 10 and the lower surface 301 of the carrier 30. In some embodiments, the first pair of positioning elements H1 can be one of a permanent magnet and a Hall Effect Sensor (Hall Effect Sensor), and the second pair of positioning elements H2 can be the other of the permanent magnet and the Hall Effect Sensor, wherein the Hall Effect Sensor can determine the position of the permanent magnet by detecting the magnetic field variation of the permanent magnet, thereby detecting and compensating the position offset of the supporting element 30 and the optical lens L caused by vibration.

Referring to fig. 5-6, fig. 6 is a bottom view of the base 10 and the circuit board F. The circuit board F is connected to the base 10 and has an opening F101, and a recess 101 (fig. 5) is formed on the upper surface of the base 10, and the recess 101 is inserted into the opening F101. Therefore, when the first unit U1 and the second unit U2 are assembled, the thickness of the circuit board F in the Z-axis (light incident direction Q) direction can be reduced, thereby effectively saving space.

Fig. 7 is a schematic diagram illustrating an optical lens L 'and a carrier 30' according to another embodiment of the invention. As shown, the main difference between the optical lens L 'and the optical lens L in fig. 2 is that the optical lens L' has two planes L '101, L' 102, which are substantially perpendicular to the Z-axis (light incidence direction Q). Compared with the optical lens L, the thickness of the optical lens L' in the Z-axis direction is thinner, so that the volume of the lens unit can be reduced. In addition, the carrier 30 'and the optical lens L' have only three contact areas CA1, CA2, and CA3 and are separated from each other, so that the contact area between the optical lens L 'and the carrier 30' can be reduced, and the assembling precision and convenience can be improved.

Fig. 8-10 are schematic views of a lens unit UL2 according to another embodiment of the present invention. The lens unit UL2 includes a first unit U3, a second unit U4 and a plurality of rolling elements B. The second unit U4 is disposed on the first unit U3 and connected to the first unit U3 through the rolling element B, wherein the second unit U4 includes four first magnetic elements M1, and the rest of the components are the same as or correspond to the second unit U2 (fig. 2), which is only slightly different in appearance, and therefore, the description thereof is omitted herein and the description thereof is omitted.

As shown in fig. 8-9, the first unit U3 in this embodiment is mainly different from the first unit U1 (fig. 2) described above in that: the first unit U3 includes four first driving coils C1 and two circuit boards F1 and F2 separated from each other, wherein the first driving coils C1, the circuit boards F1 and F2 are disposed on the bottom plate 10' in a manner substantially symmetrical to the central axis (Z-axis direction) of the lens unit UL2, and the circuit boards F1 and F2 are respectively connected to the two first driving coils C1. The four first magnetic assemblies M1 correspondingly face the first driving coil C1 to form a first electromagnetic driving assembly MC1, so that the optical lens L and the carrier 30 can be driven to move relative to the base 10'/the frame 20.

Fig. 10 is a bottom view of the base 10 ', the circuit boards F1, F2, and the rolling element B of fig. 8, wherein the base 10' is shown in phantom to show that it is a transparent element. A plurality of conductors (e.g., metal sheets) E1-E4 are embedded in the base 10', for example, formed by Insert Molding (Insert Molding) or three-dimensional Molded interconnection (3D Molded interconnection Device) technology, and electrically connected to the circuit boards F1 and F2, an external power source can apply driving signals to the circuit boards F1 and F2 and the first driving coil C1 through the conductors E1-E4, so as to drive the optical lens L to move through the electromagnetic driving component MC 1. It should be noted that, as shown in fig. 8, since the two circuit boards F1 and F2 separated from each other are respectively disposed on the left and right sides of the optical lens L and spaced apart from each other by a distance, after the first and second units U3 and U4 are assembled, a part of the bottom of the carrier 30 ″ is accommodated in a gap between the circuit boards F1 and F2, so that the overall thickness of the lens unit UL2 in the Z-axis direction can be reduced, thereby saving space.

Fig. 11 is an exploded view of a lens unit UL3 according to another embodiment of the present invention, and fig. 12 is a sectional view of the lens unit UL 3. As shown in fig. 11-12, the main differences between the lens unit UL3 of the present embodiment and the lens unit UL2 (fig. 8) are: the shape of a carrier 30 "in the first unit U6 of the lens unit UL3 is different from that of the carrier 30, and the lens unit UL3 includes a plurality of springs SF and a plurality of elastic elements S (connecting members), wherein the springs SF are disposed on the upper surface of the carrier 30", and two ends of each elastic element S are respectively connected to the springs SF and the chassis 10 ', so that the carrier 30 "and the optical lens L are movably connected to the chassis 10'; in addition, a second magnetic assembly M2 is disposed on the frame 20, and a second driving coil C2 is disposed on the upper surface of the carrier 30 ″ and connected to the spring SF (fig. 12).

In detail, the carrier 30 ″ has a substantially circular hollow structure for stably carrying the optical lens L. Four elastic members S (e.g., flexible metal wires) are respectively disposed at corners of the spring SF (e.g., metal sheet spring) to connect the carrier 30 ″ and the base 10'. The carrier 30 ″ and the optical lens L can be moved relative to the base 10' by the electromagnetic driving components MC1 (including the magnetic component M1 and the driving coil C1) and MC2 (including the magnetic component M2 and the driving coil C2), so as to achieve the optical focusing and anti-shake functions.

In summary, the present invention provides a lens driving module, which can be disposed in an electronic device and includes a lens unit, a reflective component and at least one connecting component, wherein the lens unit includes an optical lens, a carrier, a frame, a base, a first electromagnetic driving component and a second electromagnetic driving component. The reflection assembly is used for reflecting light from the outside and passing through the lens unit to the photosensitive assembly in the electronic device to obtain an image, the frame is fixed on the base, and the connecting piece can be a rolling assembly or a flexible elastic assembly and is connected with the bearing piece and the base. The first electromagnetic driving component is arranged on the base and the bearing component, the second electromagnetic driving component is arranged on the frame and the bearing component, the first and second driving components drive the bearing component and the optical lens to move relative to the base/frame, wherein the first and second driving components are positioned at different positions in the light incidence direction, so that the two electromagnetic driving components in the lens unit can reduce the mutual interference, the magnetic thrust can be effectively improved, the bearing component and the optical lens can translate relative to the base/frame along a plurality of different directions which are perpendicular to the light incidence direction, good optical focusing or compensation can be realized, and the optical lens is not overlapped with the circuit board in the base, so that the whole volume of the lens driving film group can be reduced.

Ordinal numbers such as "first," "second," etc., in the specification and claims are not necessarily consecutive to each other, but are merely used to identify two different elements having the same name.

The embodiments described above are described in sufficient detail to enable those skilled in the art to practice the disclosed apparatus, and it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention, and therefore the scope of the invention is to be determined by the appended claims.

Claims

1. A lens driving module, comprising:

a base;

a bearing member for bearing an optical lens with an optical axis, the bearing member being movably connected to the base;

the optical lens is used for receiving an external light ray which travels along a first direction after being reflected by a reflecting component from a light incidence direction, and the first direction is parallel to the optical axis;

a first electromagnetic driving assembly for driving the carrier to move along the first direction relative to the base, the first electromagnetic driving assembly including a first driving coil having a strip-shaped structure and extending toward the first direction;

a second electromagnetic driving assembly for driving the carrier to move along a second direction relative to the base, the second electromagnetic driving assembly including a second driving coil having a strip-shaped structure and extending toward the second direction; and

the elastic component is movably connected with the base through the elastic component, the elastic component is provided with a long strip-shaped structure and extends along the light incidence direction, when the elastic component is observed along the first direction, the first electromagnetic driving component and the base are positioned on a first side edge of the bearing component, the second electromagnetic driving component is positioned on a second side edge of the bearing component, the first side edge is different from the second side edge, the first side edge and the second side edge are respectively positioned on two sides of the bearing component, and when the elastic component is observed along the light incidence direction, the elastic component is positioned at one corner of the base.

2. The lens driving module as claimed in claim 1, further comprising a first alignment element located at the first side edge when viewed along the first direction.

3. The lens driving module as claimed in claim 2, further comprising a second alignment element, the alignment element being located at the first side when viewed along the first direction.

4. The lens driving module as claimed in claim 3, wherein the first and second alignment elements and a first driving coil of the first electromagnetic driving element are arranged along the first direction when viewed along the light incident direction.