CN108008589B

CN108008589B - Drive mechanism and camera device

Info

Publication number: CN108008589B
Application number: CN201710867524.4A
Authority: CN
Inventors: 胡朝彰; 张哲维; 游证凯
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2016-10-27
Filing date: 2017-09-22
Publication date: 2021-07-30
Anticipated expiration: 2037-09-22
Also published as: CN207181912U; CN108008589A

Abstract

The invention provides a driving mechanism which comprises a fixed part, a movable part and a driving module arranged between the fixed part and the movable part. The driving module comprises a first electromagnetic driving component and a second electromagnetic driving component. The first electromagnetic driving component is provided with a first surface, the second electromagnetic driving component is provided with a second surface facing the first surface, and the second surface is a curved surface. The driving module can drive the movable part to rotate around a rotating shaft relative to the fixed part.

Description

Drive mechanism and image pickup apparatus

Technical Field

The present invention relates to a drive mechanism. More particularly, the present invention relates to a drive mechanism that enhances the rotational amplitude of an optical assembly.

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.

Some electronic devices with camera or video function are equipped with driving mechanism for driving optical component to rotate so as to attain the goal of compensating shaking. However, due to the aforementioned light and thin design, interference often occurs when the optical element rotates in the electronic device, so that the rotation range of the optical element is limited. Therefore, how to solve the above problems begins to become an important issue.

Disclosure of Invention

In order to solve the above-mentioned problems, the present invention provides a driving mechanism, which includes a fixed portion, a movable portion, and a driving module disposed between the fixed portion and the movable portion. The driving module comprises a first electromagnetic driving component and a second electromagnetic driving component. The first electromagnetic driving component is provided with a first surface, the second electromagnetic driving component is provided with a second surface facing the first surface, and the second surface is a curved surface. The driving module can drive the movable part to rotate around a rotating shaft relative to the fixed part.

In an embodiment of the invention, a curvature center of the second surface is disposed on the rotation axis.

In an embodiment of the present invention, the first surface is a curved surface.

In an embodiment of the invention, the first electromagnetic driving component is disposed on the movable portion, and the second electromagnetic driving component is disposed on the fixed portion.

In an embodiment of the invention, the first electromagnetic driving component is disposed on the fixed portion, and the second electromagnetic driving component is disposed on the movable portion.

In an embodiment of the invention, the driving module further includes a soft magnetic component, and the second electromagnetic component surrounds the soft magnetic component.

In an embodiment of the invention, the driving mechanism further includes an elastic component connecting the fixed portion and the movable portion.

In an embodiment of the invention, the driving mechanism includes a plurality of second electromagnetic assemblies, and the first electromagnetic driving assembly is disposed between the elastic assembly and the second electromagnetic driving assembly.

In an embodiment of the invention, a portion of the conductive wires of the second electromagnetic driving assembly surround a first axial direction, and a portion of the conductive wires of the second electromagnetic driving assembly surround a second axial direction, and the first axial direction is different from the second axial direction.

In an embodiment of the invention, the driving mechanism includes a plurality of second electromagnetic assemblies, and the first electromagnetic driving assembly is disposed between the second electromagnetic driving assemblies.

The invention further provides a camera device, which comprises a fixed part, a movable part, a driving module and a photosensitive assembly. The driving module is arranged between the fixed part and the movable part and can drive the movable part to rotate around a rotating shaft relative to the fixed part. One surface of the photosensitive component is a curved surface.

In an embodiment of the invention, the image capturing apparatus includes an optical assembly, and a focal plane of the optical assembly is a curved surface.

In an embodiment of the invention, a focal plane of the optical component coincides with the surface of the photosensitive component.

In an embodiment of the invention, the driving module includes a first electromagnetic driving component and a second electromagnetic driving component. The first electromagnetic driving component is provided with a first surface, the second electromagnetic driving component is provided with a second surface facing the first surface, and the second surface is a curved surface.

The driving mechanism includes a fixed portion, a movable portion and a driving module, wherein the driving module can drive the movable portion to rotate relative to the fixed portion. Because the second surface of the second electromagnetic driving component in the driving module, which faces the first electromagnetic driving component, is a curved surface, the second electromagnetic driving component can not interfere with the second electromagnetic driving component when the movable part rotates, the rotation amplitude of the second electromagnetic driving component is improved, and the driving force recession caused by the rotation of the movable part is reduced.

Drawings

Fig. 1 is a schematic view showing a driving mechanism according to an embodiment of the present invention.

Fig. 2A is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 2B is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 2C is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 3A is a schematic diagram of a camera module according to an embodiment of the invention.

Fig. 3B is a schematic diagram of a camera module according to another embodiment of the invention.

Fig. 4 is a schematic view of a camera module according to another embodiment of the present invention.

Fig. 5A is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 5B is an exploded view showing the driving mechanism shown in fig. 5A.

Fig. 5C is a sectional view showing the drive mechanism shown in fig. 5A.

Fig. 5D is a sectional view showing the drive mechanism shown in fig. 5A.

Fig. 6A is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 6B is a bottom view showing the driving mechanism shown in fig. 6A.

Fig. 6C is a sectional view showing the drive mechanism shown in fig. 6A.

Fig. 6D is a sectional view showing the drive mechanism shown in fig. 6A.

Fig. 7A is a schematic view showing a driving mechanism according to another embodiment of the present invention.

Fig. 7B is a side view showing the driving mechanism shown in fig. 7A.

Fig. 7C is a sectional view showing the drive mechanism shown in fig. 7A.

Wherein the reference numerals are as follows:

100 movable part

101 accommodating space

200 fixed part

300 drive module

310. 310A, 310B first electromagnetic drive assembly

311. 311A, 311B first surface

312 surface

320. 320A, 320B second electromagnetic drive assembly

321. 321A, 321B second surface

322 surface

330 soft magnetic assembly

400 elastic component

410 inner circle segment

420 outer ring segment

P optical assembly

R rotating shaft

S photosensitive assembly

Surface of S1

Detailed Description

The driving mechanism and the camera module according to the embodiment of the present invention are explained below. 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.

As shown in fig. 1, the driving mechanism of an embodiment of the invention mainly includes a movable portion 100, a fixed portion 200 and a driving module 300, wherein the driving module 300 is disposed between the movable portion 100 and the fixed portion 200 and can drive the movable portion 100 to rotate around a rotation axis R relative to the fixed portion 200.

The driving module 300 includes at least one first electromagnetic driving component 310 and at least one second electromagnetic driving component 320, which are respectively disposed on the movable portion 100 and the fixed portion 200, and the first electromagnetic driving component 310 is adjacent to the second electromagnetic driving component 320. The first electromagnetic driving element 310 has a first surface 311, and the second magnetic element has a second surface 321 facing the first surface 311. It should be noted that the first surface 311 and the second surface 321 are curved surfaces, and the centers of curvature of the first surface 311 and the second surface 321 are located on the rotation axis R.

The movable portion 100 of the driving mechanism can rotate relative to the fixed portion 200 by electromagnetic action between the first electromagnetic driving component 310 and the second electromagnetic driving component 320. For example, the first electromagnetic drive component 310 may include a magnet, and the second electromagnetic drive component 320 may be a drive coil.

When a current is applied to the driving coil (the second electromagnetic driving component 320), an electromagnetic effect is generated between the driving coil and the magnet, so that the movable portion 100 is driven to rotate around the rotation axis R relative to the fixed portion 200. Since the first surface 311 and the second surface 321 adjacent to each other on the first electromagnetic driving element 310 and the second electromagnetic driving element 320 are both curved surfaces, the first electromagnetic driving element 310 can be prevented from colliding with the second electromagnetic driving element 320 when the movable portion 100 rotates relative to the fixed portion 200, and the rotation amplitude of the movable portion 100 can be increased.

In the present embodiment, a surface 312 of the first electromagnetic driving element 310 opposite to the first surface 311 is a curved surface parallel to the first surface 311, and a surface 322 of the second electromagnetic driving element 320 opposite to the second surface 321 is a curved surface parallel to the second surface 321. Therefore, the magnetic lines of force are distributed along the rotation path of the movable portion 100, and the deterioration of the driving force due to the rotation of the movable portion 100 is effectively reduced.

In some embodiments, in order to facilitate the arrangement of the first electromagnetic driving component 310 and the second electromagnetic driving component 320 on the movable portion 100 and the fixed portion 200, the

surfaces

312 and 322 may be planar, such as shown in fig. 2A. In some embodiments, to simplify the device manufacturing process, the first surface 311 may be a curved surface and the second surface 321 may be a flat surface, or the first surface 311 may be a flat surface and the second surface 321 may be a curved surface, as shown in fig. 2B and 2C.

In some embodiments, the first electromagnetic driving component 310 and the second electromagnetic driving component 320 may be disposed on the fixed portion 200 and the movable portion 100, respectively.

The driving mechanism can be applied to a camera module and is used for bearing and driving an optical component. Referring to fig. 3A, the movable portion 100 of the driving mechanism is a lens holder, the optical element P (a lens in this embodiment) can be disposed in the accommodating space 101 of the lens holder, and the first electromagnetic driving element 310 is disposed at the periphery of the lens holder. The light can pass through the optical assembly P to the underlying photosensitive assembly S. The driving mechanism can drive the optical component P to rotate relative to the photosensitive component S so as to achieve the purpose of shake compensation. Referring to fig. 3B, in another embodiment, the driving mechanism is applied to a periscopic camera module, and the optical component P may be a prism. The movable portion 100 of the driving mechanism is a prism carrying seat, and the optical component P can be fixed on the prism carrying seat. The light is reflected by the optical element P and then reaches the photosensitive element S toward the left. Similarly, the driving mechanism can drive the optical component P to rotate relative to the photosensitive component S, so as to achieve the purpose of shake compensation.

Referring to fig. 4, in another embodiment of the present invention, the photosensitive element S in the camera module has an arc structure, specifically, a surface S1 facing the movable portion 100 is a curved surface, and a curvature center of the surface S1 is located on the rotation axis R of the movable portion 100. By the photosensitive element S and the first and second electromagnetic driving

elements

310 and 320 having curved surfaces, the rotation angle of the movable portion 100 can be further increased without interference. In addition, in the present embodiment, the focal plane of the optical element P disposed on the movable portion 100 is a curved surface, and the focal plane coincides with the surface S1 of the photosensitive element S, so that no matter how the movable portion 100 rotates, an image can be formed on the arc-shaped photosensitive element S.

Referring to fig. 5A to 5D, in another embodiment of the present invention, the driving mechanism includes a movable portion 100, a plurality of fixed portions 200, a driving module 300 and an elastic component 400, wherein the driving module 300 includes a first electromagnetic driving component 310, a plurality of second

electromagnetic driving components

320A and 320B and a plurality of soft magnetic components 330.

The soft magnetic component 330 is fixed on the fixing portion 200, and the second

electromagnetic driving components

320A and 320B surround the soft magnetic component 330. The conductive lines of the second electromagnetic driving component 320A surround the first axial direction (X-axis direction), and the conductive lines of the second electromagnetic driving components 320B located at two sides of the second electromagnetic driving component 320A surround the second axial direction (Y-axis direction).

The elastic component 400 has an inner ring section 410 and an outer ring section 420, which are respectively connected to the movable portion 100 and the fixed portion 200, and the first electromagnetic driving component 310 is fixed in the accommodating space 101 of the movable portion 100. Therefore, as shown in fig. 5C and 5D, the movable portion 100 and the first electromagnetic driving unit 310 may be suspended above the second

electromagnetic driving units

320A and 320B by the elastic unit 400, such that the first electromagnetic driving unit 310 is located between the elastic unit 400 and the second

electromagnetic driving units

320A and 320B.

When the current is applied to the second electromagnetic driving assembly 320A, the electromagnetic action between the first electromagnetic driving assembly 310 and the second electromagnetic driving assembly 320A drives the movable portion 100 to rotate around the second axial direction. When the current is applied to the second electromagnetic driving assembly 320B, the electromagnetic action between the first electromagnetic driving assembly 310 and the second electromagnetic driving assembly 320B drives the movable portion 100 to rotate around the first axial direction.

Generally, an optical element (e.g., a prism) is disposed on the inner ring section 410 of the elastic element 400, and the optical element and the movable portion 100 are located on opposite sides of the inner ring section 410, so that when the movable portion 100 rotates, the optical element is driven to rotate. Therefore, the structure of the driving assembly of the present embodiment can make the rotation of the movable portion 100 not limited to one rotation axis, so that when the driving mechanism is used in the camera module, the effect of shake compensation can be effectively improved.

It should be noted that, as shown in fig. 5C and 5D, the first electromagnetic driving component 310 has a first surface 311, and the first surface 311 is a curved surface, and the

second surfaces

321A and 321B of the second

electromagnetic driving components

320A and 320B facing the first surface 311 are also formed as curved surfaces corresponding to the first surface 311. Accordingly, the rotation amplitude of the movable portion 100 can be increased.

Referring to fig. 6A to 6D, in another embodiment of the present invention, the driving module 300 includes a first electromagnetic driving component 310, two second electromagnetic driving components 320A, two second electromagnetic driving components 320B, and a cross-shaped soft magnetic component 330. Two second electromagnetic driving assemblies 320A are respectively disposed on opposite ends of the cross-shaped soft magnetic assembly 330 in the first axial direction, and the wires thereof surround the first axial direction (X-axis direction). Two second electromagnetic drive components 320B are respectively provided on opposite ends of the cross-shaped soft magnetic component 330 in the second axial direction (Y-axis direction), and the leads thereof surround the second axial direction (Y-axis direction). Furthermore, the size of each second electromagnetic driving assembly 320A is substantially the same as the size of each second electromagnetic driving assembly 320B. Therefore, the driving module 300 can provide uniform driving force for the movable portion 100 in all directions.

As shown in fig. 6C and 6D, similarly, the first surface 311 of the first electromagnetic driving element 310 in the present embodiment is a curved surface, and the

second surfaces

321A and 321B of each of the second

electromagnetic driving elements

320A and 320B facing the first surface 311 are also curved surfaces corresponding to the first surface 311. Therefore, the rotation amplitude of the movable portion 100 can be improved.

Referring to fig. 7A to 7C, in another embodiment of the present invention, the driving module 300 includes a plurality of first

electromagnetic driving components

310A and 310B, a second electromagnetic driving component 320A, a plurality of second electromagnetic driving components 320B, and a plurality of soft magnetic components 330. The conductive lines of the second electromagnetic driving assembly 320A surround the first axial direction (X-axis direction), and the first

electromagnetic driving assemblies

310A and 310B are disposed between the second electromagnetic driving assembly 320A and the elastic assembly 400. The conductive lines of the second electromagnetic driving element 320B surround the second axial direction (Y-axis direction), and the first

electromagnetic driving elements

310A and 310B are disposed between the second electromagnetic driving elements 320B. The first electromagnetic driving component 310A is fixed in the accommodating space 101 of the movable portion 100, and the first electromagnetic driving component 310B is disposed on the movable portion 100 and adjacent to the second electromagnetic driving component 320B.

The first surface 311A of the first electromagnetic driving element 310A is a curved surface, and the second surface 321A of the second electromagnetic driving element 320A facing the first surface 311A is also a curved surface corresponding to the first surface 311A. The first surface 311B of the first electromagnetic driving element 310B is a curved surface, and the second surface 321B of the second electromagnetic driving element 320B facing the first surface 311B is also a curved surface corresponding to the first surface 311B. Therefore, the rotation amplitude of the movable portion 100 can be improved.

In summary, the present invention provides a driving mechanism, which includes a fixed portion, a movable portion and a driving module, wherein the driving module can drive the movable portion to rotate relative to the fixed portion. Because the second surface of the second electromagnetic driving component in the driving module, which faces the first electromagnetic driving component, is a curved surface, the second electromagnetic driving component can not interfere with the second electromagnetic driving component when the movable part rotates, the rotation amplitude of the second electromagnetic driving component is improved, and the driving force recession caused by the rotation of the movable part is reduced.

Although embodiments of the present invention and their advantages have been disclosed above, 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.

While the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art to which the invention pertains will readily appreciate that numerous changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the protection scope defined by the appended claims. Furthermore, each claim constitutes a separate embodiment, and combinations of various claims and embodiments are within the scope of the invention.

Claims

1. A driving mechanism for carrying an optical assembly, comprising:

a fixed part;

a movable portion; and

a drive module, set up between this fixed part and this movable part, include:

a first electromagnetic driving component having a first surface; and

the plurality of second electromagnetic driving components are arranged on one side of the movable part in parallel, each second electromagnetic driving component is provided with a second surface facing the first surface, the second surface is a curved surface, and the driving module can drive the movable part to rotate around a rotating shaft relative to the fixed part.

2. The driving mechanism as claimed in claim 1, wherein the center of curvature of the second surface is disposed on the rotation axis.

3. The drive mechanism of claim 1, wherein the first face is curved.

4. The driving mechanism as claimed in claim 1, wherein the first electromagnetic driving component is disposed on the movable portion, and the second electromagnetic driving components are disposed on the fixed portion.

5. The driving mechanism as claimed in claim 1, wherein the first electromagnetic driving component is disposed on the fixed portion, and the second electromagnetic driving components are disposed on the movable portion.

6. The driving mechanism of claim 1, wherein the driving module further comprises a plurality of soft magnetic components, and the second electromagnetic driving components respectively surround the soft magnetic components.

7. The driving mechanism as claimed in claim 1, wherein the driving mechanism further comprises an elastic member connecting the fixed portion and the movable portion.

8. The driving mechanism as claimed in claim 7, wherein the first electromagnetic driving assembly is disposed between the elastic assembly and the plurality of second electromagnetic driving assemblies.

9. The drive mechanism of claim 8, wherein a portion of the conductive lines of the second electromagnetic drive assembly surround a first axial direction and a portion of the conductive lines of the second electromagnetic drive assembly surround a second axial direction, and the first axial direction is different from the second axial direction.

10. The drive mechanism of claim 7, wherein the first electromagnetic drive assembly is disposed between the plurality of second electromagnetic drive assemblies.

11. An image pickup apparatus comprising:

a fixed part;

a movable portion;

a driving module disposed between the fixed portion and the movable portion, wherein the driving module can drive the movable portion to rotate around a rotation axis relative to the fixed portion, the driving module comprising:

a first electromagnetic driving component having a first surface; and

the plurality of second electromagnetic driving components are arranged on one side of the movable part in parallel, each second electromagnetic component is provided with a second surface facing the first surface, and the second surface is a curved surface; and

and the photosensitive component is provided with a curved surface on one surface.

12. The image capture device of claim 11, wherein the image capture device comprises an optical element, and the focal plane of the optical element is curved.

13. The image capture device of claim 12, wherein a focal plane of the optical element coincides with the surface of the photosensitive element.

14. The image pickup device according to claim 11, wherein a center of curvature of the second surface is disposed on the rotation axis.

15. The image pickup device according to claim 11, wherein the first surface is a curved surface.

16. The camera device of claim 11, wherein the first electromagnetic driving element is disposed on the movable portion, and the second electromagnetic driving elements are disposed on the fixed portion.

17. The camera device of claim 11, wherein the first electromagnetic driving element is disposed on the fixed portion, and the second electromagnetic driving elements are disposed on the movable portion.

18. The camera device of claim 11, wherein the driver module further comprises a soft magnetic component, and at least one of the second electromagnetic driving components surrounds the soft magnetic component.

19. The camera device of claim 11, wherein the driving module further comprises an elastic member connecting the fixed portion and the movable portion.