CN111596433B

CN111596433B - Lens driving module

Info

Publication number: CN111596433B
Application number: CN202010484850.9A
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: 2023-01-10
Anticipated expiration: 2037-05-16
Also published as: CN107608052A; CN111580239B; CN111596433A; CN107608052B; CN111580238A; CN111580238B; 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 and 16 months and the application number of 2017103433997, which is named as a 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 components 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 towards 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 component.

In an embodiment, the two grooves have a long bar-shaped structure and respectively extend along a first direction and a second direction, 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 supporting member 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 mutually separated contact regions 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 received 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 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>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 chassis 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 showing the base 10', circuit boards F1 and F2, and rolling element 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 assembly;

c1, C2 first and second drive coils;

CA1, CA2, CA3 contact areas;

d1, D2 a first direction and a second direction;

e1, E2, E3, E4 conductors;

F. f1, F2 circuit board;

f101 opening;

h1 and H2 contraposition assemblies;

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 unit;

u2, U4, U6 second unit.

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 reflecting component P (e.g., a prism, a 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 in fig. 1, and fig. 3 is an assembled schematic view of the lens unit UL 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, U2. The first and second units U1 and U2 mainly include: a base 10, a circuit board F, a frame 20, a supporting member 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 base 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 base 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).

Referring to fig. 3 and 4 together, the detailed structure of the first and second electromagnetic driving components MC1 and MC2 is shown, wherein fig. 4 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A in fig. 3. The first and second magnetic assemblies M1 and M2 are respectively disposed (or embedded) on the lower and upper surfaces of the supporting member 30, the first and second driving coils C1 and C2 are respectively disposed on the base 10 and the frame 20, and the first and second magnetic assemblies M1 and M2 correspondingly face the first and second driving coils C1 and C2, so as to jointly form the first and second electromagnetic driving assemblies MC1 and MC2 capable of driving the supporting member 30 and the optical lens L to move. In the present embodiment, at least one first and one second electromagnetic driving components MC1 and MC2 (fig. 4) are respectively disposed on the left and right sides of the optical lens L, so that the supporting member 30 and the optical lens L can stably move relative to the base 10/the 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 and M2 can be respectively disposed on the base 10 and the frame 20, and the first and second driving coils C1 and C2 can be disposed on the carrier 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 component MC1, the first electromagnetic driving component 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 supporting component 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 bearing member 30 and the optical lens L can move in two different directions, i.e., the first direction D1 and the second direction 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 incident 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 for driving the optical lens L in the lens unit UL can be effectively improved. In addition, 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, so that the height of the lens unit UL in the Z-axis direction can be reduced, and the overall volume of the lens unit UL can be further reduced.

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 a strip-shaped 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 supporting member 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 strip-shaped structures, and extend toward the second and the first directions D2, D1, respectively.

Referring to fig. 4-5 again, 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 supporting member 30. In some embodiments, the first pair of bit components H1 may be one of a permanent magnet and a Hall Effect Sensor (Hall Effect Sensor), and the second pair of bit components H2 is the other of the permanent magnet and the Hall Effect Sensor, and 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 bearing 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. Thus, 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 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 or corresponding to the second unit U2 (fig. 2), and only the appearance is slightly different, so that the details are not repeated herein and will be described in advance.

As shown in fig. 8 to 9, the first unit U3 in the present 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 and the circuit boards F1 and F2 are disposed on the bottom plate 10' in a manner substantially symmetrical to a 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 and F2, and the rolling element B of fig. 8, wherein the base 10' is shown in dotted lines to show that it is a transparent element. A plurality of conductors (e.g., metal sheets) E1 to 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, and 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 to 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 supporting member 30 ″ is accommodated in a gap between the circuit boards F1 and F2, so as to reduce the overall thickness of the lens unit UL2 in the Z-axis direction, thereby saving space.

Fig. 11 is an exploded view showing 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 bearing 30 "in the first unit U6 of the lens unit UL3 is different from that of the bearing 30, and the lens unit UL3 includes a plurality of reeds SF and a plurality of elastic components S (connecting members), wherein the reeds SF are disposed on the upper surface of the bearing 30", and two ends of each elastic component S are respectively connected to the reeds SF and the mount 10', so that the bearing 30 "and the optical lens L are movably connected to the mount 10'; in addition, a second magnetic component 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 bearing 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 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.

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;

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;

the first driving assembly is used for driving the bearing piece to move along a second direction relative to the base, and the second direction is approximately vertical to the first direction; and

the bearing piece is movably connected with the base through the rolling component, wherein the first direction is parallel to the optical axis;

when viewed along the first direction, the rolling assembly is located at a bottom side of the bearing member, and the first driving assembly is located at a left side and a right side of the bearing member.

2. The lens driving module as claimed in claim 1, further comprising a first recess for receiving the rolling element, a long axis of the first recess extending substantially along the second direction.

3. The lens driving module as claimed in claim 2, wherein the base is adjacent to the bottom side when viewed along the first direction.

4. The lens driving module of claim 1, wherein the first driving assembly further comprises a first driving coil having an elongated structure and extending toward the first direction.

5. The lens driving module as claimed in claim 2, further comprising a second groove for accommodating the rolling element, a long axis of the second groove extending substantially along the first direction, and the first direction and the second direction being substantially perpendicular to the light incident direction.

6. The lens driving module as claimed in claim 5, further comprising a second driving component for driving the carrier to move along the first direction relative to the base.

7. The lens driving module of claim 6, wherein the first driving assembly further comprises a first driving coil having an elongated structure and extending toward the first direction; the second driving assembly further comprises a second driving coil which is provided with a long strip-shaped structure and extends towards the second direction.

8. The lens driving module as claimed in claim 7, wherein the second driving component is located at the bottom edge of the carrier when viewed along the first direction.

9. The lens driving module as claimed in claim 8, further comprising a first alignment element located at the bottom side when viewed along the first direction.

10. The lens driving module as claimed in claim 9, wherein the rolling element and the second driving element are arranged along the first direction when viewed along the light incident direction.

11. The lens driving module as claimed in claim 10, wherein the first alignment element and the rolling element are arranged along the first direction when viewed along the light incident direction.