CN107632363A - Lens driving mechanism and electronic device with same - Google Patents

Abstract

The invention provides a lens driving mechanism and an electronic device with the same. The lens driving structure is used for driving a lens unit to move along an optical axis direction and comprises an outer frame, a base, a lens bearing piece and a driving assembly. The outer frame contains the plastic material and has an trompil, base and outer frame contact and mutual fixation, wherein form an accommodation space between outer frame and the base. The lens bearing piece is movably arranged in the accommodating space and is used for bearing the lens unit, wherein an external light enters the accommodating space through the opening of the outer frame and reaches the lens unit. The driving assembly is arranged in the accommodating space and connected with the lens bearing piece and the outer frame so as to drive the lens unit to move along the optical axis direction.

Description

Lens driving mechanism and electronic device with lens driving mechanism

technical field

The invention relates to a lens driving mechanism, in particular to a lens driving mechanism with an outer frame made of plastic material. The invention also relates to an electronic device with a lens driving mechanism.

Background technique

Generally, a camera lens is usually arranged on a mobile phone or a tablet computer, which mainly includes a lens unit and a lens driving mechanism (such as a Voice Coil Motor (VCM)) for driving the lens unit. Most of the mechanisms are equipped with a drive assembly composed of magnets and coils, so that the lens unit accommodated in the lens drive mechanism can be driven to move along the direction of its optical axis, thereby achieving the effect of autofocus.

Please refer to FIG. 1A and FIG. 1B , wherein FIG. 1A shows a schematic view of a conventional voice coil motor 10 connecting a transparent plate G and a circuit board P, and FIG. 1B shows a cross-sectional view along line A-A in FIG. 1A . It can be seen from FIG. 1A and FIG. 1B that an outer frame 11 of the voice coil motor 10 is combined with a base 13, a lens carrier 12 is arranged in the accommodation space 101 formed by the outer frame 11 and the base 13, and an upper reed S1 connects the outer frame 11 and the lens carrier 12, and the lower spring S2 connects the base 13 and the lens carrier 12, so that the lens carrier 12 and the lens unit (not shown) accommodated therein can pass through the voice coil The motor 10 is driven to move relative to the outer frame 11 and the base 13 along the direction of its optical axis. In addition, the transparent plate G is attached to the top surface 111 of the outer frame 11 to protect the lens unit and other parts inside the lens driving mechanism 10 and allow external light to enter the voice coil motor 10 through the transparent plate G.

However, since the outer frame 11 of the voice coil motor 10 is mostly stamped from a metal plate with magnetic permeability, and in view of the smaller and smaller volume of portable electronic devices, communication components (such as antennas or wireless communication chip) is easily affected by the metal frame 11 to reduce its performance; Usually, a recessed structure 112 (as shown in FIG. 1A and FIG. 1B ) is formed at the four corners of the metal frame 11, so as to facilitate the upper surface of the upper spring S1 and the lens carrier 12 and the lower surface of the recessed structure 112 (Fig. 1B), and this will make the bonding area between the top surface 111 of the outer frame 21 and the transparent plate G smaller, so as to affect the overall structural strength after assembly.

Contents of the invention

The main purpose of the present invention is to provide a lens driving mechanism, which can greatly reduce the overall size of the lens driving mechanism and effectively reduce the manufacturing cost.

Another main purpose of the present invention is to provide an electronic device, which can greatly reduce the overall size of the lens driving mechanism and effectively reduce the manufacturing cost.

An embodiment of the present invention provides a lens driving mechanism for driving a lens unit to move along an optical axis, including an outer frame, a base, a lens carrier and a driving assembly. The outer frame is made of plastic material and has an opening. The base is in contact with the outer frame and fixed to each other, wherein an accommodation space is formed between the outer frame and the base. The lens carrier is movably arranged in the accommodation space for carrying the lens unit, wherein an external light enters the accommodation space through the opening of the outer frame and reaches the lens unit. The drive assembly is arranged in the accommodation space and connected with the lens carrier and the outer frame to drive the lens unit to move along the optical axis.

In one embodiment, the outer frame further has a protrusion, a top surface and a side surface, the side surface extends from the edge of the top surface toward the base, the protrusion protrudes from an inner surface of the outer frame, And corresponding to the adjacent portion of the top surface and the side surface, so as to improve the structural strength of the outer frame.

In one embodiment, the top surface is quadrangular.

In one embodiment, the outer frame further includes metal material.

In one embodiment, the lens driving mechanism further includes a wire formed on the outer frame by molded interconnect device (Molded Interconnect Device, MID) technology.

In one embodiment, the aforementioned driving assembly includes a first magnetic element and a second magnetic element, wherein the first magnetic element and the second magnetic element are respectively arranged on the outer frame and the lens carrier, and the lens carrier The component moves relative to the outer frame and the base through the magnetic force generated between the first magnetic element and the second magnetic element.

In one embodiment, the outer frame further has a clamping portion protruding from an inner surface of the outer frame and restricting the first magnetic element to a predetermined position on the inner surface.

In one embodiment, the clamping portion has a U-shaped structure, and the first magnetic element is accommodated in the U-shaped structure.

In one embodiment, the first magnetic element is a magnet, and the second magnetic element is a coil to which a current can be applied.

In one embodiment, the first magnetic element comprises a multi-pole magnet.

In one embodiment, the lens carrier has a protruding slider, and the outer frame also has a limiting structure, wherein the slider is accommodated in the limiting structure to limit the movement of the slider .

In one embodiment, the limiting structure has two limiting parts protruding from an inner surface of the outer frame, wherein a groove extending toward the optical axis is formed between the limiting parts, and The width of the groove is greater than the width of the slider.

In one embodiment, the lens driving mechanism is substantially polygonal and further includes two driving assemblies, the driving assemblies are respectively arranged on opposite sides of the lens driving mechanism to drive the lens unit to move along the optical axis direction, wherein The slider and the limiting structure are located on a side of the lens driving mechanism different from the driving assembly.

In one embodiment, the outer frame is roughly quadrilateral and further has a body made of plastic material and a metal plate, wherein the opening is formed on the body, and the metal plate is disposed on one side of the body.

In one embodiment, the metal plate is formed with a plurality of holes, and the body is formed with a plurality of protrusions, wherein the protrusions are fitted into the holes.

In addition, the present invention also provides an electronic device, including the aforementioned lens driving mechanism, a housing, and a wireless communication component, wherein the lens driving mechanism is substantially polygonal, and both the lens driving mechanism and the wireless communication component are It is arranged in the casing, wherein the driving component is adjacent to a first side of the lens driving mechanism, the wireless communication element is adjacent to a second side of the lens driving mechanism, and the second side is different from the first side.

The lens driving mechanism and electronic device provided by the present invention have the following advantages and beneficial effects: The present invention provides a lens driving mechanism and an electronic device with the lens driving mechanism, wherein since the outer frame of the lens driving mechanism contains plastic materials, it can Manufactured in an integrated manner, the overall size of the lens driving mechanism can be greatly reduced and the manufacturing cost can be effectively reduced. In addition, even if the communication components (such as antennas or wireless communication chips) inside the electronic device are close to the lens driving mechanism, the lens driving mechanism made of plastic material can reduce the impact on the communication components, so it can be miniaturized while the electronic device is miniaturized. Ensure the performance of communication components.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings.

Description of drawings

FIG. 1A shows a schematic diagram of a known voice coil motor connected to a transparent plate and a circuit board;

Fig. 1 B represents the sectional view along A-A line segment in Fig. 1A;

Fig. 2 shows the explosion diagram of the lens driving mechanism of an embodiment of the present invention;

Fig. 3A shows the schematic diagram of combining the lens driving mechanism in Fig. 2 with a transparent plate and a circuit board;

Figure 3B represents a sectional view along the line B-B in Figure 3A;

Figure 4A shows a perspective view of the outer frame in Figure 3A;

Figure 4B shows a top view of the outer frame in Figure 4A;

FIG. 5A shows a perspective view after the outer frame in FIG. 4A is assembled with the lens carrier and the first magnetic element;

Fig. 5B shows a top view of the outer frame, the lens carrier and the first magnetic element in Fig. 5A;

6 shows a perspective view of a lens driving mechanism according to another embodiment of the present invention; and

FIG. 7 shows a perspective view of a lens driving mechanism according to another embodiment of the present invention.

Explanation of reference signs

Voice coil motor 10

Accommodating space 101

Frame 11

Top 111

Debossed Structures 112

Lens carrier 12

base 13

Lens drive mechanism 20

Frame 21

Body 21'

Hole 210

Top 211

side 212

Bump 213

Lens carrier 22

Perforation 220

Slider 221

Base 23

sheet metal 24

hole 240

The first magnetic element M

Second magnetic element C

Transparent plate G

Optical axis L

circuit board P

Limiting structure R1

Limiting part R11

Groove R12

Clamping part R2

Trench R21

Upper reed S1

Lower reed S2

detailed description

A preferred embodiment of the present invention will now be described in conjunction with the accompanying drawings.

The foregoing and other technical contents, features and technical effects related to the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 2 shows an exploded view of a lens driving mechanism 20 according to an embodiment of the present invention. As shown in the figure, the lens driving mechanism 20 of this embodiment is mainly used to carry a lens unit (not shown), wherein a driving assembly composed of magnetic elements such as magnets and coils is provided inside the lens driving mechanism 20 to drive The lens unit can move along the optical axis L direction of the lens unit, so as to achieve the effect of automatic focusing.

Specifically, the lens driving mechanism 20 mainly includes an outer frame 21, a lens carrier 22, a base 23, an upper reed S1, a lower reed S2, at least one first magnetic element M and at least one second The magnetic element C, wherein the outer frame 21 is roughly quadrangular and has an opening 210, the four sides 212 of the outer frame 21 extend from the edge of the top surface 211 toward the base 23, and the base 23 and the outer frame 21 are fixedly combined with each other, the lens The carrier 22 is movably disposed between the outer frame 21 and the base 23 , wherein the lens carrier 22 has a through hole 220 for accommodating and carrying the aforementioned lens unit (not shown). It should be understood that external light can enter the lens driving mechanism 20 through the opening 210 of the outer frame 21, and pass through the lens unit in the center of the lens carrier 22 and the base 23 below in sequence, and finally project on an image sensing unit ( Such as CCD) surface to obtain image data.

It can be seen from FIG. 2 that the first magnetic element M is disposed on the inner surface of the outer frame 21 , and the second magnetic element C is disposed on the outer surface of the lens carrier 22 and corresponds to the first magnetic element M. In this embodiment, the first magnetic element M is, for example, a single-pole or multi-pole magnet, and the second magnetic element C is, for example, a coil. When it is desired to drive the lens unit to move along the direction of the optical axis L, an appropriate current can be applied. To the second magnetic element C, so that the magnetic field generated by the second magnetic element C interacts with the magnetic field of the first magnetic element M, so that the lens unit can be controlled to move along the optical axis L through magnetic force, so as to achieve rapid focusing and Anti-shock and other purposes. It should be noted that the first magnetic element M can also be a coil, and the second magnetic element C can be a single-pole or multi-pole magnet, so that the effect of controlling the movement of the lens unit through magnetic force can also be achieved.

Please refer to Fig. 2, Fig. 3A and Fig. 3B together again, wherein Fig. 3A represents a schematic diagram of the lens driving mechanism 20 in Fig. 2 combined with a transparent plate G and a circuit board P, and Fig. 3B represents the line along the line B-B in Fig. 3A cutaway view. It can be seen from FIG. 3A that the assembled lens driving mechanism 20 can be combined with a plastic or glass transparent plate G, wherein the transparent plate G is attached to the flat top surface 211 above the outer frame 21, thereby protecting the lens. The lens unit and other parts inside the drive mechanism 20 can also allow external light to enter the inside of the lens drive mechanism 20 through the transparent plate G, so as to facilitate converting the received light into electrons by an image sensing unit (such as a CCD). signal, wherein the lens driving mechanism 20 can be electrically connected to an external power source through the circuit board P combined with it, or can transmit electronic signals to the processor outside the lens driving mechanism 20 through the circuit board P for data calculation.

Please refer to FIG. 2 and FIG. 3B together. It can be seen from the figure that the lens carrier 22, the upper S1 and the lower spring S2 are all arranged in the accommodation space 201 formed by the outer frame 21 and the base 23, wherein the upper spring The piece S1 connects the outer frame 21 and the lens carrier 22 , and the lower spring S2 connects the base 23 and the lens carrier 22 . It should be noted that since the outer frame 21 in this embodiment contains plastic material (for example, it can be completely made of plastic material, or metal powder can be mixed into the plastic material), so injection molding or insert molding (Insert molding) can be used. MoLdinG) etc. are integrally formed, wherein the protrusion 213 ( FIG. 3B ) can also be directly formed on the inner surface of the outer frame 21 when the outer frame 21 is formed, and the position of the aforementioned protrusion 213 corresponds to the quadrilateral top of the outer frame 21 The adjoining part of the surface 211 and the side surface 212 can not only form a large-area and flat quadrangular top surface 211 above the outer frame 21, so as to increase the bonding area between the outer frame 21 and the transparent plate G and strengthen the fixing effect between the two At the same time, the overall structural strength of the outer frame 21 can be greatly improved by forming the bump 213 near the adjoining portion of the top surface 211 and the side surface 212 of the outer frame 21 .

Alternatively, the outer frame 21 can also be made by doping metal powder in the plastic material, which can not only increase the magnetic field strength inside the mechanism, but also compared with the traditional pure plastic material. In terms of the method of pressing the metal plate, its structural strength can be improved. On the other hand, since the outer frame 21 is made of plastic material and can be made by integral molding, the wires can be directly formed on the outer frame 21 by Molded Interconnect Device (MID) technology. Additional circuit elements (such as the circuit board P in FIG. 3A ) are provided to connect with external circuits, which can greatly reduce the overall size of the lens driving mechanism 20 and reduce manufacturing costs.

Then please refer to Fig. 2, Fig. 4A～Fig. 5B together, wherein Fig. 4A represents the perspective view of the outer frame 21 in Fig. 3A, Fig. 4B represents the top view of the outer frame 21 in Fig. 4A, Fig. 5A represents the outer frame in Fig. 4A 21 is a perspective view of the assembly of the lens carrier 22 and the first magnetic element M. FIG. 5B shows a top view of the outer frame 21, the lens carrier 22 and the first magnetic element M in FIG. 5A. As shown in Figure 2 and Figure 4A-5B, at least one protruding slider 221 is formed on the outer surface of the lens carrier 22, and at least one limiting structure R1 is formed on the inner surface of the outer frame 21, corresponding to the The slider 221, wherein each limiting structure R1 has two limiting parts R11 protruding from the inner surface of the outer frame 21, and a strip extending toward the optical axis L is formed between the two limiting parts R11 Shaped groove R12, wherein the width of the groove R12 is slightly larger than the width of the slider 221. In this embodiment, by accommodating the slider 221 in the limiting structure R1 , the movement of the slider 221 in the horizontal direction can be limited, so as to prevent it from colliding with other parts of the lens driving mechanism 20 during use.

In addition, it can be seen from FIG. 2 and FIGS. 4A to 5B that at least one protruding clamping portion R2 is formed on the inner surface of the outer frame 21, wherein the clamping portion R2 has a U-shaped structure, and the first The magnetic element M is accommodated in the groove R21 in the center of the clamping portion R2, thereby preventing the first magnetic element M from detaching from the outer frame 21, and restricting the first magnetic element M to a predetermined position on the inner surface of the outer frame 21 . It should be understood that since the outer frame 21 in this embodiment is made of plastic material and can be manufactured in an integrated manner, the limiting structure R1 and the clamping portion R2 can be directly formed on the inner surface of the outer frame 21 during the forming process. , without having to set additional positioning elements, thereby greatly reducing material and assembly costs.

Furthermore, it can also be clearly seen from FIG. 2 and FIGS. 4A-5B that the lens driving mechanism 20 of this embodiment is roughly quadrangular and is provided with two pairs of driving assemblies (each driving assembly includes The first magnetic element M and the second magnetic element C are respectively arranged on the opposite sides of the lens carrier 22 to drive the lens carrier 22 and the lens unit to move along the direction of the optical axis L, wherein the slider 221 and the stop The structure R1 is located on a side of the lens driving mechanism 20 different from the driving components (for example, on the left and right sides of the lens carrier 22 in FIG. 5B ).

Please refer to FIG. 6 , which shows a perspective view of a lens driving mechanism 20 according to another embodiment of the present invention. As shown in the figure, the outer frame 21 of the lens driving mechanism 20 of this embodiment has a hollow and quadrangular body 21' and a metal plate 24, wherein the body 21' is made of plastic material, and the metal plate 24 can be embedded (Insert MoLdinG) and integrally formed on one side of the body 21'.

Please refer to FIG. 7 again, which shows a perspective view of a lens driving mechanism 20 according to another embodiment of the present invention. As shown in the figure, the difference between this embodiment and the embodiment of FIG. 6 is that: a plurality of elongated holes 240 are formed on the metal plate 24, and the side of the metal plate 24 is corresponding to the body 21'. A plurality of protrusions are formed, and the plurality of protrusions fit into the holes 240 .

According to the contents disclosed in the aforementioned embodiments, the present invention also provides an electronic device, including the lens driving mechanism 20 disclosed in any of the aforementioned embodiments, wherein the lens driving mechanism 20 is substantially polygonal, and the lens driving mechanism 20 and at least A wireless communication element (such as an antenna or a wireless communication chip) is disposed in the casing of the electronic device. It should be noted that the aforesaid driving assembly is adjacent to a first side of the lens driving mechanism 20 (for example, located on the upper side or the lower side of the lens carrier 22 in FIG. 5B ), and the wireless communication element is adjacent to a first side of the lens driving mechanism 20. Two sides (for example, on the left or right side of the outer frame 21 in FIG. 5B ).

To sum up, the present invention provides a lens driving mechanism and an electronic device having the lens driving mechanism. Since the outer frame of the lens driving mechanism contains plastic materials, it can be manufactured in an integrated manner, thereby greatly reducing the size of the lens driving mechanism. The overall size of the mechanism can effectively reduce the manufacturing cost. In addition, even if the communication components (such as antennas or wireless communication chips) inside the electronic device are close to the lens driving mechanism, the lens driving mechanism made of plastic material can reduce the impact on the communication components, so it can be miniaturized while the electronic device is miniaturized. Ensure the performance of communication components.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention, and those skilled in the art may appropriately make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection can be defined according to the appended claims.

Claims (16)

1. a kind of lens driving mechanism, to drive a lens unit to be moved along an optical axis direction, the lens driving mechanism bag Include：

One housing, containing plastic cement material and there is a perforate；

One base, contact and interfix with the housing, wherein form a receiving space between the housing and the base；

One camera lens bearing part, is actively arranged in the receiving space, to carry the lens unit, wherein an extraneous light passes through The receiving space is entered by the perforate of the housing and reaches the lens unit；And

One drive component, it is arranged in the receiving space, connects the camera lens bearing part and the housing, drives the lens unit Moved along the optical axis direction.

2. lens driving mechanism as claimed in claim 1, the wherein housing also have a projection, a top surface and one side, The side extends from the edge of top surface towards the base direction, and the projection protrudes from an inner surface of the housing, and corresponds to and be somebody's turn to do Top surface and the adjoiner of the side, to lift the structural strength of the housing.

3. lens driving mechanism as claimed in claim 2, the wherein top surface are in quadrangle.

4. lens driving mechanism as claimed in claim 1, the wherein housing also contain metal material.

5. lens driving mechanism as claimed in claim 1, the wherein lens driving mechanism also include a wire, with mold interconnecting Device technology is formed on the housing.

6. lens driving mechanism as claimed in claim 1, the wherein drive component include one first magnetic element and one the Two magnetic elements, wherein first magnetic element, the second magnetic element are respectively arranged on the housing and the camera lens bearing part, And the camera lens bearing part by caused magneticaction between first magnetic element, the second magnetic element and outer relative to this Frame and base movement.

7. lens driving mechanism as claimed in claim 6, the wherein housing also have a clamping part, the one of the housing is protruded from Inner surface simultaneously limits first magnetic element in the commitment positions on the inner surface.

8. lens driving mechanism as claimed in claim 7, the wherein clamping part have a U-shaped structure, and first magnetic Element is placed in the U-shaped structure.

9. lens driving mechanism as claimed in claim 6, wherein first magnetic element are a magnet, and second magnetic member Part is a coil that can be applied in electric current.

10. lens driving mechanism as claimed in claim 9, wherein first magnetic element include a multipole magnet.

11. lens driving mechanism as claimed in claim 1, wherein the camera lens bearing part have the sliding block of a protrusion, and this is outer Frame also has a position limiting structure, and the wherein sliding block is placed in the position limiting structure, to limit the movement of the sliding block.

12. lens driving mechanism as claimed in claim 11, the wherein position limiting structure have two limiting sections, it is outer to protrude from this One inner surface of frame, wherein a groove extended towards the optical axis direction is formed between the limiting section, and the width of the groove More than the width of the sliding block.

13. lens driving mechanism as claimed in claim 11, the wherein lens driving mechanism substantially include in polygon and also Two drive components, the drive component are respectively arranged at the opposite side of the lens driving mechanism, to drive the lens unit edge The optical axis direction moves, and wherein the sliding block and the position limiting structure, which are located in the lens driving mechanism, is different from the drive component Side.

14. lens driving mechanism as claimed in claim 1, the wherein housing are substantially in quadrangle and also have one to include plastic cement The body of material and a metallic plate, the wherein perforate are formed on the body, and the metallic plate is arranged at the side of the body.

15. lens driving mechanism as claimed in claim 14, the wherein metallic plate are formed with multiple holes, and the body is formed There are multiple protuberances, wherein the protuberance is embedded in described hole.

16. a kind of electronic installation, it includes lens driving mechanism, a housing and a radio communication as claimed in claim 1 Element, the wherein lens driving mechanism are substantially in polygon, and the lens driving mechanism and the wireless communication unit may be contained within In the housing, wherein the drive component is adjacent to one first side of the lens driving mechanism, and the wireless communication unit is adjacent to the camera lens One second side of drive mechanism, and second side is different from first side.