CN113873110A

CN113873110A - Camera module and terminal

Info

Publication number: CN113873110A
Application number: CN202110985961.2A
Authority: CN
Inventors: 冉坤; 姚秀文; 罗振东
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2021-12-31
Anticipated expiration: 2039-10-28
Also published as: WO2021082529A1; CN110913099A; CN113873110B; CN110913099B

Abstract

The application provides a camera module and terminal, this camera module includes fixed lens group and adjustable lens group, and wherein, fixed lens group and adjustable lens group are along the range upon range of setting of the axis of camera module, and adjustable lens group and fixed lens group are coaxial. The adjustable lens group can slide along the axial direction of the camera module relative to the fixed lens group; therefore, the focal length of the camera module can be adjusted by adjusting the adjustable lens group; the camera module further comprises a driving mechanism for driving the adjustable lens group to slide relative to the fixed lens group.

Description

Camera module and terminal

Technical Field

The application relates to the technical field of terminals, in particular to a camera module and a terminal.

Background

The invention provides a design method aiming at miniaturization and simplification of a camera module.

In the prior art, an independent special motor is usually adopted to drive the whole lens to complete optical focusing; however, in this way, the independent and dedicated motor occupies a large space, so that the camera module cannot be miniaturized; in addition, along with the continuous increase of chip size, the size of the corresponding special motor also needs to be increased synchronously, so that the size of the outsole module is increased, and the use of mobile terminals such as mobile phones is not facilitated.

Disclosure of Invention

The application provides a camera module and a terminal for making things convenient for the regulation of camera module.

In a first aspect, a camera module is provided, which is applied to a terminal and comprises a fixed lens group and an adjustable lens group, wherein the fixed lens group and the adjustable lens group are stacked along an axis of the camera module, and the adjustable lens group and the fixed lens group are coaxial when the adjustable lens group and the fixed lens group are arranged. In addition, when the adjustable lens group is arranged, the adjustable lens group can slide along the axial direction of the camera module relative to the fixed lens group; therefore, the focal length of the camera module can be adjusted by adjusting the adjustable lens group; in addition, the camera module further comprises a shape memory alloy wire for driving the adjustable lens group to slide relative to the fixed lens group. It can be seen from the above description that, in the technical scheme disclosed in the present application, the lens of the camera module is divided into two parts, and when the camera module is focused, the whole lens does not need to be driven to move, and only the adjustable lens group needs to be driven, so that the weight of the lens group which needs to be adjusted when the camera module is adjusted is reduced, and in addition, the power of the shape memory alloy wire can be reduced, and the focusing can be completed only by selecting a smaller shape memory alloy wire, so that the size of the camera module is reduced.

In a specific possible embodiment, the shape memory alloy wire is disposed between the adjustable lens group and the fixed lens group, the shape memory alloy wire, and the adjustable lens group are stacked in an axial direction of the camera module. And then reduce the space area that whole camera module occupy, can also improve the bore of camera module.

In a specific possible embodiment, the shape memory alloy wire is fixed to the fixed lens group, and the adjustable lens group is connected to the fixed lens group through the shape memory alloy wire. The fixed lens group is connected with the adjustable lens group through the shape memory alloy wire.

In a specific embodiment, the lens system further comprises a spring plate, the adjustable lens group is connected with the fixed lens group through the spring plate, and the spring plate provides an elastic force for restoring the adjustable lens group to the initial position.

In a specific embodiment, the adjustable lens group includes a first lens barrel, and one or more first lenses fixed in the first lens barrel, and the one or more first lenses are disposed coaxially with an axis of the camera module. The weight of the lens group driven by the shape memory alloy wire is reduced.

In a specific embodiment, when the number of the first lenses is multiple, the multiple first lenses are arranged at intervals along the axial direction of the camera module. The lens group can be divided into a fixed lens group and an adjustable lens group in different ways as required.

In a specific embodiment, the fixed lens group includes a second lens barrel, and a plurality of second lenses fixed in the second lens barrel, and the plurality of second lenses are arranged coaxially with the axis of the camera module.

In a specific possible embodiment, the camera module further includes: the image sensor comprises a circuit board, an image sensor electrically connected with the circuit board, and a bracket for packaging the image sensor, wherein the bracket is provided with an optical filter; the image sensor and the optical filter are coaxially arranged with the axis of the camera module; the fixed lens group is fixedly connected with the bracket; the shape memory alloy wire is electrically connected with the circuit board. The shape memory alloy wire is powered through the circuit board.

In a specific possible implementation, the fixed lens group and the bracket are provided with metal layers electrically connected, and the shape memory alloy wire is electrically connected with the circuit board through the metal layers.

In a specific possible implementation, the camera module further comprises a substrate, and the circuit board and the image sensor are fixed on the substrate. The entire camera assembly is supported by the substrate.

In a specific embodiment, the shape memory alloy wire comprises: and the shape memory alloy wire is respectively connected with the fixed lens group and the adjustable lens group. The adjustable lens group is driven by the shape memory alloy wire.

In a second aspect, a method for manufacturing a camera module is provided, where the method includes the following steps: the image sensor is fixed on the circuit board; assembling a cover body, and bonding and connecting the side wall of the optical filter with the side wall of the mounting hole on the bracket; the cover body is connected with the circuit board in a sealing mode, and the support in the cover body surrounds the image sensor so as to seal the image sensor through the cover body; assembling the lens, assembling the adjustable lens group and the fixed lens group into a lens through a shape memory alloy wire, and then fixedly connecting the fixed lens group and the bracket. In the technical scheme disclosed in the application, divide into two parts with the camera lens of camera module, when focusing to camera module, need not to drive whole camera lens motion, only need drive adjustable lens group can to the weight of the lens group that needs the adjustment when having reduced adjustment camera module can also reduce the power of shape memory alloy silk in addition, only need select less shape memory alloy silk can accomplish the focusing, thereby reduced the volume of camera module.

In a specific embodiment, the assembled lens further includes: an elastic member is fitted between the fixed lens group and the adjustable lens group. The recovery effect of the adjustable lens group is improved.

In a specific embodiment, the lens holder further comprises a metal layer disposed on the fixed lens group and the support and electrically connected to the circuit board, and the shape memory alloy wire is electrically connected to the circuit board through the metal layer. Realize the power supply to the shape memory alloy wire.

In a third aspect, a terminal is provided, which includes a housing, and the camera module of any one of the above items fixed in the housing. It can be seen from the above description that, in the technical scheme disclosed in the present application, the lens of the camera module is divided into two parts, and when the camera module is focused, the whole lens does not need to be driven to move, and only the adjustable lens group needs to be driven, so that the weight of the lens group which needs to be adjusted when the camera module is adjusted is reduced, and in addition, the power of the shape memory alloy wire can be reduced, and the focusing can be completed only by selecting a smaller shape memory alloy wire, so that the size of the camera module is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a camera module in the prior art;

fig. 2 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a camera module according to an embodiment of the present application;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

fig. 5 is a schematic structural diagram of another camera module provided in the embodiment of the present application;

fig. 6 is a schematic view illustrating an operating state of the camera module according to the embodiment of the present disclosure;

fig. 7 is a schematic view of another working state of the camera module according to the embodiment of the present application.

Detailed Description

In order to facilitate understanding of the camera module provided in the embodiment of the present application, an application scenario of the camera module provided in the embodiment of the present application is first described below. The camera module is used for providing a camera function of the terminal when being applied to the terminal, and a mobile phone is taken as an example for explanation for convenience in understanding. When the camera module is applied to a mobile phone, the camera module can be used as a front camera module or a rear camera module, but the principle of the front camera module and the principle of the rear camera module are the same, and the following description will be given by taking the rear camera module as an example. As shown in fig. 2, fig. 2 shows a schematic view of the camera module 10 as a rear camera module 10 assembled in a mobile phone including a housing 20, and the camera module 10 of any one of the above items fixed in the housing 20. And the lens of camera module 10 exposes on the surface of cell-phone, when shooing, gathers the image through camera module 10 and shoots. With the development of the thinning of the mobile phone, the space for accommodating the camera module 10 in the mobile phone is also smaller and smaller, so that the camera module 10 is required to be miniaturized. Therefore, the embodiments of the present application provide a camera module, which is described in detail below with reference to the accompanying drawings and specific embodiments.

Referring first to fig. 3, fig. 3 illustrates a structure of a camera module provided in an embodiment of the present application, where the camera module 10 illustrated in fig. 3 includes at least a main body 11 and a lens connected to the main body 11; wherein the lens is used to collect light and the body 11 is used to convert optical signals into electrical signals and form images. In fig. 3, the lens includes an adjustable lens group 12 and a fixed lens group 13, and the adjustable lens group 12 and the fixed lens group 13 are stacked on the main body 11 and connected to the main body 11; when in use, external light can pass through the lens and then irradiate into the main body 11, and the main body 11 takes the sensed light as an optical signal and converts the optical signal into an electrical signal to form an image.

Referring also to fig. 4, fig. 4 shows a schematic structural diagram of a-a in fig. 3, wherein the schematic structural diagram of a-a is a schematic diagram of the camera module cut along a direction shown by a-a in fig. 3. Referring first to the main body 11 of fig. 4, and with continued reference to the figures, the main body 11 of the camera module 10 may include a substrate 113, and a circuit board 114 and an image sensor 116 disposed on the substrate 113. Where the substrate 113 serves as a carrier, for convenience of description, two opposing surfaces of the substrate 113 are named: the first surface is a surface of the substrate 113 for carrying the device, and the second surface is a surface of the substrate 113 connected to other structures of the terminal. When the circuit board 114 is disposed, as shown in fig. 4, the circuit board 114 is fixed on the first surface of the substrate 113, and specifically, when the circuit board 114 is fixed, a connector such as a threaded connector (a bolt or a screw), a buckle, or the like, or a connection manner such as welding, bonding, or the like may be used. When the circuit board 114 is specifically selected, different types of circuit boards 114, such as the printed circuit board 114, may be selected, or different types of circuit boards 114, such as a single-sided circuit board 114, a double-sided circuit board 114, and the like, may be used.

With continued reference to fig. 4, the image sensor 116 utilizes the photoelectric conversion function of the photoelectric device to divide the light image on the light receiving surface into many small cells, and converts the small cells into usable electrical signals. In a specific arrangement, the image sensor 116 may be a photoconductive camera tube or a solid-state image sensor 116. With continued reference to fig. 4, when the image sensor 116 is disposed, the image sensor 116 is fixed on the first surface of the substrate 113, and a hollow structure is disposed on the circuit board 114 for accommodating the image sensor 116. When the image sensor 116 is fixed to the first surface of the substrate 113, the image sensor 116 may be fixed to the circuit board 114 by a common fixing process such as bonding or soldering. After the image sensor 116 is fixed on the circuit board 114, the light receiving surface of the image sensor 116 faces away from the circuit board 114, so that the light receiving surface faces the lens, and the light entering the lens can directly irradiate the image sensor 116.

With continued reference to fig. 4, in addition to the above-mentioned fixed connection, the image sensor 116 and the circuit board 114 are electrically connected, and as shown in fig. 4, the image sensor 116 is electrically connected by a metal flying wire, and the electrical signal converted by the image sensor 116 can be transmitted to the circuit board 114 through the metal flying wire and transmitted to the processor of the terminal through the circuit board 114. In addition, the surface mount elements 115 are further disposed on the first surface of the circuit board 114, and as shown in fig. 4, one surface mount element 115 is disposed on each side of the image sensor 116, but the disposition positions and the number of the surface mount elements 115 in fig. 4 are merely an example, and the specific number and the disposition positions of the surface mount elements 115 are not limited in the embodiment of the present application. The surface-mounted component 115 may be various electrical devices, such as an inductor, a capacitor, or other electrical devices. It should be understood that in the embodiment of the present application, the surface mount element 115 is an optional component, and a different number of surface mount elements 115 may be provided on the circuit board 114 or no surface mount elements 115 may be provided as required.

With reference to fig. 4, it can be seen from the operation principle of the image sensor 116 that when the image sensor 116 is used, if impurities fall on the light receiving surface of the image sensor 116, the imaging effect of the camera module 10 is affected. Therefore, the main body 11 of the camera module 10 according to the embodiment of the present application further includes a cover for sealing the image sensor 116 to prevent dust from falling on the light receiving surface of the image sensor 116. With continued reference to fig. 4, fig. 4 illustrates a specific cover structure that includes a holder 111 and an optical filter 112. The bracket 111 shown in fig. 4 is a housing structure, and reference is also made to the structure shown in the dotted line portion in fig. 3, which is a frame outline of the invisible portion of the camera module 10. As can be seen from fig. 3 and 4, the bracket 111 is a structure with two open ends, and includes four sidewalls and a bottom wall, and the bottom wall is provided with a mounting hole (not numbered in fig. 4) for matching with the optical filter 112, and the side of the bracket 111 opposite to the bottom wall is an opening. When the bracket 111 is connected to the circuit board 114, the open side of the bracket 111 covers the first surface of the circuit board 114, and the surface mount device 115 and the image sensor 116 are covered in the bracket 111. When the bracket 111 is fixed on the circuit board 114, the bracket 111 is further connected to the circuit board 114 in a sealing manner, for example, a circle of adhesive is coated on the circuit board 114, and the bracket 111 is connected to the circuit board 114 in an adhesive manner and sealed by the adhesive, although the adhesive is merely an example of a specific connection manner, in the embodiment of the present application, other connection manners and sealing manners may also be adopted. The material of the bracket 111 may be selected from different materials according to the requirement, such as metal material or plastic material, and the metal material may be made of different materials, such as aluminum, steel, alloy steel, and the like.

With continued reference to fig. 4, the mask body according to the embodiment of the present application further includes an optical filter 112, the optical filter 112 is disposed in the mounting hole, as shown in fig. 4, the mounting hole is a stepped hole, and the stepped hole is located above the image sensor 116, as shown in the X direction in fig. 4. Referring to fig. 4 together, it can be seen in fig. 4 that the stepped hole is circular and the corresponding filter 112 is also circular, but the specific shape of the filter 112 is not limited in the embodiments of the present application, and the filter 112 may be a square, an oval, a special shape, or other symmetrical or asymmetrical shape. However, whatever shape the filter 112 takes, it should be ensured that the perpendicular projection of the filter 112 on the plane of the light-receiving surface covers the light-receiving surface so that light can be transmitted through the filter 112 to the light-receiving surface. When the filter 112 is circular, the axis of the filter 112 is the same as the axis of the image sensor 116, and the axis is also the same as the axis of the lens in the lens, and the axis is also the axis of the camera module 10.

With continued reference to fig. 4, the smaller diameter of the stepped hole is closer to the image sensor 116, the larger diameter of the stepped hole is farther from the image sensor 116, and the stepped surface of the stepped hole serves as a support surface for supporting the optical filter 112. When the filter 112 is placed in the mounting hole, the filter 112 is placed in the hole having a large diameter and the filter 112 is supported by the support surface, and the side wall of the filter 112 is bonded to the side wall of the stepped hole. As shown in fig. 4, the diameter of the hole with the larger diameter in the stepped hole is larger than the diameter of the optical filter 112, when the optical filter 112 is bonded in the stepped hole, a certain gap is formed between the sidewall of the stepped hole and the sidewall of the optical filter 112, and the adhesive is filled in the gap, so that the optical filter 112 and the bracket 111 are bonded and fixed, and the optical filter 112 and the bracket 111 are sealed.

When assembling the main body 11, the holder 111 in the cover is first assembled with the filter 112, and then the entire cover is connected to the circuit board 114. When assembling the cover body, the optical filter 112 is first placed in the stepped hole, then the adhesive is applied, the gap between the sidewall of the stepped hole and the sidewall of the optical filter 112 is filled with the adhesive, so that the optical filter 112 is fixed in the stepped hole, and the optical filter 112 is sealed with the bracket 111 by the adhesive. When the cover is assembled with the circuit board 114, the bracket 111 is fixed on the circuit board 114 by the adhesive and is connected with the circuit board 114 in a sealing manner, and after the cover is fixed, the image sensor 116 is sealed in a space enclosed by the circuit board 114 and the cover, so that dust is prevented from falling onto the image sensor 116. In addition, because the cover body is not in direct contact with the image sensor 116 (the side wall and the top of the bracket 111 and a certain gap is formed between the optical filter 112 and the image sensor 116), the image sensor 116 is not polluted in the assembling process, and the safety of the image sensor 116 is improved.

In addition, as can be seen from fig. 4, when the filter 112 is fixed to the bracket 111, the thickness of the bottom wall can be thinner due to the connection between the side walls between the filter 112 and the bracket 111, so that the height of the bracket 111 can be effectively reduced in height, and further, the height of the whole main body 11 is reduced, and the height of the whole camera module 10 is also reduced.

With continuing reference to fig. 2 and fig. 4, the camera module 10 provided in the embodiment of the present application further includes a lens, and the lens is divided into two parts: a fixed lens group 13 and an adjustable lens group 12. As shown in fig. 4, the fixed lens group 13 and the adjustable lens group 12 are disposed in a stacked manner along the axis of the camera module 10, and the fixed lens is located at a side close to the main body 11, and the adjustable lens group 12 is located at a side away from the main body 11. The fixed lens and the adjustable lens group 12 will be described separately below.

With continued reference to fig. 4, the fixed lens includes a second barrel 131 and a plurality of second lenses fixed within the second barrel 131. Referring to fig. 3 and 4, the second barrel 131 is fixedly connected to the bracket 111 of the main body 11, for example, the second barrel 131 is fixedly connected to the main body 11 by a threaded connector (bolt or screw) or a buckle, or the second barrel 131 may also be fixedly connected to the bracket 111 by bonding, welding, or the like. And when the second barrel 131 is fixed on the bracket 111, the second barrel 131 covers the filter 112 on the bracket 111. With continued reference to fig. 4, the second barrel 131 has a through hole therein, which is a circular stepped hole, wherein the hole with the larger diameter is close to the filter 112, and the hole with the smaller diameter is far from the filter 112. The plurality of second lenses 132 are disposed in the stepped hole, and the plurality of second lenses 132 have the same axis and are spaced apart in the height direction (the placement direction of the camera module 10 shown in fig. 4 is taken as a reference direction). In the camera module 10 shown in fig. 4, four second lenses 132 are shown, and three of the second lenses 132 are disposed in the holes having the smaller diameters, and the other second lens 132 is disposed in the holes having the larger diameters. When the plurality of second lenses 132 are fixed in the second barrel 131, the second lenses 132 may be fixed in the through holes by using an adhesive, or a clamping groove may be formed in a side wall of the through holes, and the second lenses 132 are directly clamped and fixed in the clamping groove, or other common fixing methods may be used for fixing, which is not specifically limited in the embodiment of the present application. With continued reference to fig. 4, when the four second lenses 132 are disposed, the four second lenses 132 are disposed coaxially, and the axis is coaxial with the axis of the optical filter 112, so that the light passing through the second lenses 132 can pass through the optical filter 112 and then irradiate on the image sensor 116.

In fig. 4, although four second lenses 132 are shown, the specific number of the second lenses 132 is not limited in the embodiment of the present application, and the number of the second lenses 132 may be adjusted as needed in actual production, such as two, three, five, six, and so on. In addition, the focal length, curvature and other parameters of each second lens 132 can be adjusted according to actual needs, and as shown in fig. 4, three second lenses 132 with smaller diameter and smaller curvature and one lens with larger diameter and larger curvature are adopted. However, the second lens 132 with other diameters and curvatures may also be adopted, and only the through hole of the second barrel 131 needs to be correspondingly adjusted, and the specific diameter, focal length and curvature of the second lens 132 are not limited herein.

With continued reference to fig. 4, the structure of the adjustable lens group 12 provided in the embodiment of the present application is similar to that of a fixed lens. In the adjustable lens group 12 shown in fig. 4, the adjustable lens group 12 includes a first barrel 121 and a first lens fixed in the first barrel 121. Referring to fig. 3 and 4, the first barrel 121 and the second barrel 131 are arranged along the direction of the main axis of the camera module 10, and the first barrel 121 has a through hole therein, which is a circular through hole. The first lens 122 is fixed in the through hole, when the first lens 122 is fixed in the first barrel 121, the first lens 122 may be fixed in the through hole by using an adhesive, or a clamping groove may be provided on a side wall of the through hole, and the first lens 122 is directly clamped in the clamping groove for fixing, or other common fixing methods may be used for fixing, which is not specifically limited in the embodiment of the present application.

It should be understood that the number of the first lenses 122 in the adjustable lens group 12 provided in the embodiment of the present application can be set as required, and is not limited to the manner of one first lens 122 shown in fig. 4, as shown in fig. 5, in another camera module 10 shown in fig. 5, the adjustable lens is provided with two first lenses 122, and the two first lenses 122 are stacked along the axis of the camera module 10, and the arrangement manner of the two first lenses 122 is similar to the arrangement and placement of the second lens 132 in the fixed lens group 13, and is not described herein again. As can be seen from the above description, in the present embodiment, the number of the first lenses 122 in the adjustable lens group 12 and the number of the second lenses 132 in the fixed lens group 13 can be adjusted as required, such as one or more, and a plurality in the present embodiment refers to two or more numbers. When the first lens is a plurality of, a plurality of first lens are arranged along the axis of camera module, and the axis of first lens is coaxial with the axis of camera module. For example, the first lens and the lenses in the camera module may be divided according to different requirements, for example, when one lens of the lenses in the camera module is divided into the first lens 122, the remaining lenses in the camera module are the second lens 132, and when two lenses of the lenses are divided into the first lens 122, the remaining lenses in the camera module are the second lens 132.

With continued reference to fig. 4 and 5, when the adjustable lens group 12 is disposed, the adjustable lens group 12 and the fixed lens group 13 are coaxial, and the first lens 122 in the adjustable lens group 12, the second lens 132 in the fixed lens, the optical filter 112 and the image sensor 116 are coaxially disposed, so that external light can irradiate the image sensor 116 to form an image after passing through the first lens 122, the second lens 132 and the optical filter 112.

With continued reference to fig. 4 and 5, when the adjustable lens group 12 is set, the adjustable lens group 12 can slide relative to the fixed lens group 13 along the axial direction of the camera module 10, as shown by the arrow shown in fig. 4, and with the placement direction of the camera module 10 shown in fig. 4 as the reference direction, the adjustable lens group 12 can slide vertically upward or vertically downward relative to the fixed lens group 13. In particular, when the adjustable lens group 12 is driven, the camera module 10 further includes a driving mechanism for driving the adjustable lens group 12 to slide relative to the fixed lens group 13. In the camera module 10 shown in fig. 4, the driving mechanism is a shape memory alloy wire 14, as shown in fig. 4, the shape memory alloy wire 14 is located between the first barrel 121 and the second barrel 131, and the shape memory alloy wire 14 is fixedly connected to the first barrel 121 and the second barrel 131 respectively. Two ends of the shape memory alloy wire 14 shown in fig. 4 are fixedly connected to the first barrel 121 and the second barrel 131, respectively, and the ends of the shape memory alloy wire 14 may be connected to the first barrel 121 and the second barrel 131 in a one-to-one correspondence manner by welding or a threaded connection (bolt or screw).

With continued reference to fig. 4 and 5, in operation, the shape memory alloy wire 14 is powered through the circuit board 114, and the shape memory alloy wire 14 is electrically connected to the circuit board 114. As shown in fig. 4, a specific implementation manner of connecting the shape memory alloy wire 14 and the circuit board 114 is illustrated in fig. 4, a metal layer 15 is disposed on the side walls of the bracket 111 and the second barrel 131, and the disposed metal layer 15 is electrically connected to the shape memory alloy wire 14 and the circuit board 114, respectively. Specifically, when the metal layer 15 is provided, the metal layer 15 is provided on the side wall of the second barrel 131 and the holder 111 by fixing or thermal spraying. For convenience of description, the metal layer 15 on the second barrel 131 is named as a first metal layer 151, and the metal layer 15 on the support 111 is named as a second metal layer 152. Taking spraying as an example, a first metal layer 151 is sprayed on the side wall of the second barrel 131, and a second metal layer 152 is sprayed on the side wall of the holder 111; one end of the second metal layer 152 is electrically connected to the circuit board 114, and the other end extends to an end surface of the support 111 facing away from the circuit board 114. The first metal layer 151 that is plated on the second barrel 131 extends to opposite end surfaces of the second barrel 131, the second metal layer 152 that extends to near one end surface of the holder 111 is used to electrically connect with the portion of the first metal layer 151 located on the end surface of the holder 111 facing away from the circuit board 114, and the portion of the first metal layer 151 that extends to the end surface facing away from the circuit board 114 is electrically connected with the shape memory alloy wire 14, so that the shape memory alloy wire 14 is electrically connected with the circuit board 114 through the first metal layer 151 and the second metal layer 152.

When the lens assembly is used, the circuit board 114 supplies power to the shape memory alloy wire 14 through the first metal layer 151 and the second metal layer 152, and the shape memory alloy wire 14 deforms to push the adjustable lens set 12 away from the fixed lens set 13. Referring first to fig. 6, in an operating state of the camera module illustrated in fig. 6, when the circuit board 114 supplies power to the shape memory alloy wire 14, the shape memory alloy wire 14 is deformed by heat and is elongated in the direction of the arrow shown in fig. 6, and the distance between the first barrel 121 and the second barrel 131 is h 1; as shown in fig. 7, fig. 7 illustrates another working state of the camera module, after the circuit board 114 powers off the shape memory alloy wire 14, the shape memory alloy wire 14 recovers to the original shape, and drives the adjustable lens group 12 to approach the fixed lens group 13, i.e. drives the first barrel 121 to slide toward the second barrel 131 along the direction indicated by the arrow in fig. 2, at this time, the distance between the first barrel 121 and the second barrel 131 is h2, where h1 > h2, and when the shape memory alloy wire 14 drives the adjustable lens group 12, the sliding direction of the adjustable lens group 12 is parallel to the axial direction of the camera module 10.

In the above example, the shape memory alloy wire 14 and the circuit board 114 are connected by using the metal layer 15, but the embodiment of the present application is not limited to a specific connection method, and the shape memory alloy wire 14 and the circuit board 114 may be electrically connected by using a wire or another electrical connection method.

With continued reference to fig. 4, in fig. 4, the number of the shape memory alloy wires 14 is two, and the two shape memory alloy wires 14 are disposed around the axis of the camera module 10, but the number of the shape memory alloy wires 14 is not specifically limited in the embodiments of the present application, and three, four, five, six, etc. different numbers may be provided in the specific arrangement, but it should be ensured that the number of the shape memory alloy wires 14 is at least two, and at least two shape memory alloy wires 14 are arranged around the axis of the camera module 10, for example, arranged in an equidistant manner, or arranged in a non-equidistant manner.

Of course, the driving mechanism provided in the present application is not limited to the shape memory alloy wire 14 listed above, and other common camera driving motors may be used to drive the adjustable lens group 12 to slide. Also in the camera module 10 provided in the embodiment of the present application, the driving mechanism is fixed to the fixed lens group 13, and the adjustable lens group 12 is connected to the fixed lens group 13 through the driving mechanism. Thereby realizing the connection of the fixed lens group 13 and the adjustable lens group 12 through the driving mechanism without an additional connecting device. Therefore, the driving mechanism serves as both a member for driving the adjustable lens group 12 to slide and a member for connecting the adjustable lens group 12 to the fixed lens.

In order to enable the adjustable lens group 12 to return to the initial position as soon as possible, the camera module 10 according to the embodiment of the present application further includes an elastic member (not shown in the figure), one end of the elastic member is fixedly connected to the first barrel 121, and the other end of the elastic member is fixedly connected to the second barrel 131. When the shape memory alloy wire 14 pushes the adjustable lens group 12 to be away from the fixed lens group 13, the elastic member is elastically deformed at the same time, the shape memory alloy wire 14 overcomes the elastic force of the elastic member to push the adjustable lens group 12 to slide, and after the shape memory alloy wire 14 is powered off, the elastic force of the elastic member drives the adjustable lens group 12 to slide towards the fixed lens group 13, thereby driving the adjustable lens group 12 to return to the initial position. The elastic member may be different elastic members, such as common elastic members, such as a tension spring, an elastic sheet, a rubber spring, and the like, and is not limited herein.

As can be seen from fig. 4 and fig. 5, in the embodiment of the present application, the lens of the camera module 10 is divided into two parts, one part is the adjustable lens group 12, and the other part is the fixed lens group 13, when focusing the lens, only the adjustable lens group 12 needs to be driven to slide, and the whole lens does not need to be adjusted, whereas in the camera module in the prior art shown in fig. 1, the lens 1 includes a housing 3 and a driving mechanism 1 surrounding the housing 3, and when the driving mechanism 1 works, the whole housing 3 needs to be driven to move. As can be seen from fig. 1, in the camera module provided in the embodiment of the present application, when focusing is performed, it is not necessary to drive the whole lens to move, and only the adjustable lens group 12 needs to be driven, so as to reduce the weight of the driving mechanism when adjusting the lens, and in addition, the power of the driving mechanism can be reduced, and the adjustable lens group 12 can be driven to realize focusing at different object distances only by selecting a smaller driving mechanism.

In addition, when the driving mechanism is arranged, the fixed lens group 13, the driving mechanism and the adjustable lens group 12 are stacked along the axial direction of the camera module 10, and the driving mechanism is arranged between the adjustable lens group 12 and the fixed lens group 13, so that no extra space area is occupied; therefore, in the design, the space area occupied by the lens can be greatly reduced, and as can be seen from comparing fig. 1 and 4, when the width of the lens is D, the aperture D3 of the lens 1 in the prior art is affected by the width D1 of the driving mechanism 2 and the width D2 of the housing 3 in the lens: d3 ═ D-2D1-2D 2. In the camera module 10 according to the embodiment of the present application, as shown in fig. 4, the width of the lens is also D, and the aperture D4 of the lens is only affected by the width D5 of the first barrel 121: d4 ═ D-2D 5. Since the first barrel 121 and the housing in the lens are similar in structure, d5 can be regarded as being approximately equal to d 2. As can be seen from the above description, in the camera module 10 provided in the embodiment of the present application, by changing the driving manner of the lens, the aperture d5 of the lens can be designed to be larger, so as to realize the characteristic of a large aperture and improve the imaging quality.

For convenience in understanding, the embodiment of the present application further provides a method for manufacturing a camera module, where the method includes the following steps:

the method comprises the following steps: the image sensor is fixed on the circuit board;

specifically, as shown in fig. 4, when the image sensor 116 is disposed, the image sensor 116 is fixed on the first surface of the substrate 113, and a hollow structure is disposed on the circuit board 114 for accommodating the image sensor 116. When the image sensor 116 is fixed to the first surface of the substrate 113, the image sensor 116 may be fixed to the circuit board 114 by a common fixing process such as bonding or soldering. After the image sensor 116 is fixed on the circuit board 114, the light receiving surface of the image sensor 116 faces away from the circuit board 114, so that the light receiving surface faces the lens, and the light entering the lens can directly irradiate the image sensor 116.

Assembling a cover body, and bonding and connecting the side wall of the optical filter with the side wall of the mounting hole on the bracket;

specifically, the side wall of the optical filter is connected to the side wall of the mounting hole in an adhesive manner, and the specific description may refer to the detailed description above, which is not limited herein.

And thirdly, the cover body is connected with the circuit board in a sealing mode, and the support in the cover body surrounds the image sensor so as to seal the image sensor through the cover body.

Specifically, when the cover body is assembled with the circuit board, the support is fixed on the circuit board through the adhesive and is in sealing connection with the circuit board, and after the cover body is fixed, the image sensor is sealed in a space enclosed by the circuit board and the cover body, so that dust is prevented from falling onto the image sensor. In addition, the cover body is not in direct contact with the image sensor (a certain gap is formed between the side wall and the top of the support and between the optical filter and the image sensor), so that the image sensor is not polluted in the assembling process, and the safety of the image sensor is improved.

And step four, assembling the lens, namely assembling the adjustable lens group and the fixed lens group into the lens through a driving mechanism, and then fixedly connecting the fixed lens group with the bracket.

Specifically, as shown in fig. 4, the fixed lens group 13 and the adjustable lens group 12 are connected by a shape memory alloy wire 14, and the adjustable lens group 12 is driven to move by deformation of the shape memory alloy wire 14. Wherein, an elastic member (not shown in the figure) is assembled between the fixed lens group 13 and the adjustable lens group 12, and the adjustable lens group 12 is driven to restore to the initial position by the elastic deformation of the elastic member. When the shape memory alloy wire 14 is electrically connected to the circuit board, the driving mechanism is electrically connected to the circuit board 114 through the metal layers disposed on the fixed lens group 13 and the bracket 111. The detailed description may refer to the related description in fig. 4.

It can be seen from the above description that the lens of the camera module is divided into two parts, when the camera module is focused, the whole lens is not required to be driven to move, only the adjustable lens group is required to be driven, so that the weight of the lens group required to be adjusted when the camera module is adjusted is reduced, in addition, the power of the driving mechanism can be reduced, the focusing can be completed only by selecting the smaller driving mechanism, and the size of the camera module is reduced.

In a specific embodiment, the assembled lens further includes: in a specific embodiment, the power supply to the driving mechanism is realized.

The embodiment of the application further provides a terminal, and the terminal can be a common terminal such as a mobile phone, a tablet computer or a notebook computer. When the camera module 10 is applied to a terminal, it is used to provide a camera function of the terminal, and a mobile phone is taken as an example for convenience of understanding. When the camera module 10 is applied to a mobile phone, it can be used as a front camera module or a rear camera module, but the principle of the front camera module and the rear camera module are the same, and the following description will be given by taking the rear camera module as an example. As shown in fig. 2, fig. 2 shows a schematic view of the camera module 10 as a rear camera module 10 assembled in a mobile phone including a housing 20, and the camera module 10 of any one of the above items fixed in the housing 20. In fig. 2, three camera modules are shown, the three camera modules are arranged along a linear line, and each camera module is the camera module 10 described above, but it should be understood that fig. 2 only shows a specific arrangement manner of the camera modules, the number and arrangement manner of the camera modules are not limited in the mobile phone provided in the embodiment of the present application, for example, three camera modules are adopted, but the three camera modules are arranged in different manners such as a triangle, a linear line, and the like, or four camera modules are adopted, and the four camera modules are arranged in different shapes such as a positive direction, a linear line, and a trapezoid. However, no matter which mode is adopted, the lens of each camera module 10 is exposed on the surface of the mobile phone, and when shooting is carried out, images are collected through the camera modules 10 to shoot. The structure of the camera module can refer to the description above, the camera module 10 in the embodiment of the present application is buckled on the image sensor through the support and is connected with the circuit board in a sealing manner, and the optical filter is fixed on the support.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a camera module, is applied to the terminal, its characterized in that includes: the adjustable lens group and the fixed lens group are stacked along the axis of the camera module; the adjustable lens group and the fixed lens group are coaxially arranged; wherein the content of the first and second substances,

the adjustable lens group can slide along the axial direction of the camera module relative to the fixed lens group;

the camera module also comprises a shape memory alloy wire for driving the adjustable lens group to slide relative to the fixed lens group;

the shape memory alloy wire is arranged between the adjustable lens group and the fixed lens group, the shape memory alloy wire and the adjustable lens group are stacked along the axial direction of the camera module, wherein when the shape memory alloy wire is electrified, the shape memory alloy wire is deformed;

the camera module further comprises an elastic piece, the adjustable lens group is connected with the fixed lens group through the elastic piece, and the elastic piece provides elastic force for restoring the adjustable lens group to the initial position.

2. The camera module of claim 1, wherein the shape memory alloy wire is fixed to the fixed lens group, and the adjustable lens group is connected to the fixed lens group through the shape memory alloy wire.

3. The camera module according to claim 1 or 2, wherein the adjustable lens group comprises a first barrel and one or more first lenses fixed in the first barrel, and the one or more first lenses are coaxially arranged with an axis of the camera module.

4. The camera module according to claim 3, wherein when the number of the first lenses is plural, the plural first lenses are arranged at intervals along an axial direction of the camera module.

5. The camera module according to any one of claims 1 to 4, wherein the fixed lens group comprises a second barrel, and a plurality of second lenses fixed in the second barrel, and the plurality of second lenses are disposed coaxially with an axis of the camera module.

6. The camera module according to any one of claims 1 to 5, further comprising: the image sensor comprises a circuit board, an image sensor electrically connected with the circuit board, and a bracket for packaging the image sensor, wherein the bracket is provided with an optical filter; wherein the content of the first and second substances,

the image sensor and the optical filter are coaxially arranged with the axis of the camera module;

the fixed lens group is fixedly connected with the bracket;

the shape memory alloy wire is electrically connected with the circuit board.

7. The camera module as claimed in claim 6, wherein the fixed lens group and the holder are provided with metal layers electrically connected, and the shape memory alloy wire is electrically connected to the circuit board through the metal layers.

8. The camera module of claim 7, further comprising a substrate, wherein the circuit board and the image sensor are secured to the substrate.

9. A terminal, characterized by comprising a housing and the camera module according to any one of claims 1 to 8 fixed in the housing.