TWI413843B - Lens unit of camera module - Google Patents

Abstract

A lens unit of a camera module include a barrel, a lens received in the barrel, a permanent magnetic element and an elastic element. The permanent magnetic element and the elastic element are mounted around the lens unit. The elastic element includes at least one elastic piece. The elastic piece includes one end connected to the lens unit and an opposite end being adapted for connecting with a stator of the camera module. The end of the elastic piece connected to the lens unit moves together with the lens unit with respect to the opposite end of the elastic piece to distort during a telescopic movement of the lens unit.

Description

Camera module lens set

The invention relates to a lens set of a camera module, in particular to a lens set which can be applied to a camera module capable of autofocusing in a portable electronic device such as a mobile phone.

With the continuous development of digital technology, electronic technology is widely used in the field of cameras, digital imaging technology has been rapidly developed, and cameras are becoming more intelligent. In particular, in recent years, portable electronic devices such as mobile phones and PDAs (personal digital assistants) with digital camera functions are rapidly developing into high-performance and multi-functional directions. The design requirements for digital camera modules are light, short, and high-performance. The trend.

Conventional camera modules generally employ a two-segment or non-segment autofocus structure including a far and near focus. The camera module with two-stage autofocus of far and near focus can only focus on the two positions of far focus and near focus, and continuous auto focus cannot be performed during the shooting of the camera, thus affecting the quality of the captured image. In the conventional camera module with a segmentless autofocus, the lens assembly usually includes a lens barrel, a lens housed in the lens barrel, a coil disposed around the periphery of the lens barrel, and a ring disposed on the periphery of the lens barrel and sandwiched. A spring is disposed between the lens group and the stator assembly of the camera module, and a magnet is disposed on the stator assembly. In autofocus, a current is applied to the coil, and the magnetic field generated by the energization of the coil interacts with the magnetic field of the magnet to drive the lens group to move and deform the spring. When the magnetic field generated by the coil is energized and interacts with the magnetic field of the magnet When the generated magnetic force and the spring are balanced by the elastic force generated by the deformation, the lens group can be stopped. In a focus position.

In the above camera module, since the coil is provided on the periphery of the lens barrel of the lens group, the lens group and the stator group are assembled together, and the coil and the electrical connector on the stator group need to be electrically connected, and the assembly process is extremely inconvenient and automatic. During the focusing process, the coil moves along with the lens group, and after multiple focusing, the end of the coil is easily released from the electrical connector on the stator seat. In addition, a conductive sheet may be further disposed outside the lens group, and the coil is electrically connected to the electrical connector on the stator group by the conductive sheet. However, the components of the lens group are increased and the structure is complicated.

In view of this, it is necessary to provide a lens set of a camera module that is simple in structure and easy to assemble, to assist the camera module in continuous autofocus.

A lens assembly of a camera module, comprising a lens barrel and a lens received in the lens barrel, wherein the lens group further comprises a magnetic component and an elastic member ringed around the lens barrel, the elastic component comprising at least one a spring piece, one end of the elastic piece is fixedly connected with the lens group, and the other end of the elastic piece is used for connecting and fixing with a stator set of a camera module. When the magnetic element is subjected to an external magnetic field to drive the movement of the lens group, the elastic piece and the elastic piece are The lens group is connected to fix one end to follow the lens group to move relative to the other end of the elastic piece to deform the elastic piece.

The magnetic component in the lens group of the camera module of the present invention can be driven by an external magnetic field to drive the lens group to move and focus, so that one end of the elastic piece and the lens group is fixed with respect to the other end thereof for fixing with the stator set of a camera module. Distorted by motion to achieve continuous autofocus. The lens group structure of the camera module of the present invention is compared with the lens group in which the coil is looped around the lens barrel. When the lens assembly of the camera module is assembled into a camera module, only the other end of the elastic piece needs to be fixed to the stator assembly of the camera module, and the assembly is convenient.

Further description will be made below with reference to the accompanying drawings.

1 and FIG. 2, which is a preferred embodiment of a lens assembly 30 of a camera module according to the present invention. The lens assembly 30 can be applied to a camera module of a digital camera, a camera phone, a camera monitor or other electronic products. . The lens assembly 30 includes a lens barrel 31, a lens 32 received in the lens barrel 31, and an elastic member 33 and a magnetic member 34 disposed around the periphery of the lens barrel 31.

The lens barrel 31 has a cylindrical shape, and a receiving hole 311 is formed in the center thereof to accommodate the lens 32 therein. The lens barrel 31 is provided with a step portion 312 on the outer circumference of the bottom portion for carrying the elastic member 33 and the magnetic member 34. In this embodiment, the step portion 312 is a ring that protrudes from the outer peripheral surface of the lens barrel 31 in the radial direction of the lens barrel 31, and the step portion 312 may also be a plurality of convex portions distributed along the circumferential direction of the lens barrel 31. Piece. The magnetic element 34 is disposed around the periphery of the lens barrel 31. In the embodiment, the magnetic element 34 is a ring-shaped magnet. The elastic member 33 includes an inner ring 331 , an outer ring 333 , and a plurality of elastic pieces 335 connected between the inner ring 331 and the outer ring 333 . The inner ring 331 and the outer ring 333 of the elastic member 33 are all octagonal in shape, and a circular hole 336 is formed in the center of the inner ring 331. The diameter of the circular hole 336 is slightly larger than the outer diameter of the lens barrel 31 and smaller than the step portion 312. Outer diameter. The inner ring 331 and the outer ring 333 are spaced apart from each other, and the elastic piece 335 is evenly distributed in the circumferential direction in the gap between the inner ring 331 and the outer ring 333 of the elastic member 33, and is connected to the outer circumference and the outer ring 331. Between the inner circumferences of the ring 333. One end of each of the elastic pieces 335 is connected to the inner ring 331 and the other end is connected to the outer ring 333. Each of the elastic pieces 335 is bent and extended between the inner ring 331 and the outer ring 333 in the clockwise circumferential direction. In this embodiment, the elastic member 33 includes three elastic pieces 335, and each of the elastic pieces 335 has an extended length of about one third of a circumference. The inner ring 331, the outer ring 333 and the elastic piece 335 of the elastic member 33 are located on the same plane. The radial stiffness coefficient K1 of the elastic member 33 is greater than the axial stiffness coefficient K2. In this embodiment, the material of the elastic member 33 is copper, and the radial stiffness coefficient K1 is approximately 3*10 ⁴ N/m, and the radial stiffness coefficient K1 of the elastic member 33 is approximately the axial stiffness. 100 times the coefficient K2.

When the lens barrel 31, the lens 32, the elastic member 33, and the magnetic element 34 are assembled into the lens group 30, the elastic member 33 and the magnetic member 34 are disposed around the periphery of the lens barrel 31, wherein the inner ring 331 of the elastic member 33 is disposed at On the step portion 312, the magnetic member 34 is disposed above the elastic member 33, and the inner ring 331 of the elastic member 33 is interposed between the step portion 312 and the magnetic member 34, and the inner ring 331 and the magnetic member 34 of the elastic member 33. The adhesive connection is made, and the inner surface of the magnetic member 34 and the outer surface of the lens barrel 31 are adhered to each other, and the outer ring 333 of the elastic member 33 is used for fixed connection with the stator assembly of a camera module.

FIG. 3 is a cross-sectional view showing a lens assembly 30 of the camera module of the present invention applied to a camera module. The camera module includes a housing 10, a stator assembly 20 disposed within the housing 10, and a lens assembly 30 movable relative to the stator assembly 20.

The stator assembly 20 includes upper and lower stator seats 21a and 21b and upper and lower coils 22a and 22b wound around the upper and lower stator seats 21a and 21b, respectively. After the upper and lower stator seats 21a, 21b are butted together, a hollow area (not shown) is formed together. The housing 31 and the lens 32 of the lens unit 30 are accommodated, and a receiving space 24 is formed between the upper and lower stator bases 21a and 21b to receive the elastic member 33 and the magnetic member 34 of the lens assembly 30, and the receiving space 24 The height is greater than the height of the elastic member 33 and the magnetic member 34. When the lens assembly 30 is assembled to the stator assembly 20 of the camera module, the outer ring 333 of the elastic member 33 and the stator assembly 20 are connected by means of card positioning, dispensing, etc., and the assembly process is simple. The intermediate ring 333 of the elastic member 33 is connected and fixed to the stator seat 21b under the stator assembly 20.

In operation, after a photosensitive element (not shown) in one of the spaces 23 at the bottom of the lower stator base 21b is imaged, the control power supply respectively inputs a corresponding magnitude of current to the upper and lower coils 22a, 22b, up and down. The coils 22a, 22b are energized to generate a magnetic field, respectively, interacting with the magnetic field of the magnetic element 34 to drive the lens assembly 30 to move axially within the stator assembly 20 and focus, during the movement of the lens assembly 30 relative to the stator assembly 20, The elastic piece 335 of the piece 33 is connected to one end (moving end) of the lens group 30 to move axially relative to the other end (fixed end) thereof connected to the stator set 20, and the elastic piece 335 of the elastic member 33 is deformed to different degrees in the axial direction. When the magnitude of the elastic force generated is different, the moving end of the elastic piece 335 is changed by changing the magnitude of the current flowing through the upper and lower coils 22a, 22b while the magnetic field strength of the magnetic element 34 is constant. The length of the fixed end is deformed, thereby controlling the axial movement distance of the lens group 30. When the elastic member 33 is deformed by the elastic force of the elastic piece 335 and the magnetic field generated by the current flowing through the upper and lower coils 22a, 22b, When the magnetic field of the magnetic element 34 is in a state of equilibrium, to remain in the lens group 30 corresponding to the focus position, the lens group 30 in order to achieve the The purpose of continuous focusing.

Hereinafter, one of the focusing will be described as an example, and it is assumed that the magnetic element 34 has an N pole at the upper end in the axial direction and an S pole at the lower end. After the photosensitive element is sensed and imaged, it is assumed that the control power source inputs a current of 0.2 amps (A) to the upper and lower coils 22a, 22b, respectively, so that the upper coil 22a is excited to generate a magnetic field of N pole and S pole, and the lower coil. The excitation of 22b generates a magnetic field having an upper S pole and a lower N pole. The magnetic field of the upper coil 22a and the magnetic field of the magnetic element 34 attract each other, and the magnetic field of the lower coil 22b and the magnetic field of the magnetic element 34 repel each other, thereby driving the mirror together. The barrel 31 and the lens 32 move upward along the axial direction together with the magnetic member 34. At this time, the moving end of the elastic piece 335 of the elastic member 33 also moves upward along the axial direction together with the magnetic member 34, and the moving end of the elastic piece 335 is opposite to the fixed end thereof. The length of the deformation in the axial direction gradually increases. When the lens group 30 is moved upward by 0.2 cm in the axial direction, the elastic member 33 is generated by the elastic force generated by the elastic deformation of the elastic piece 335 by 0.2 cm in the axial direction and the current of the upper and lower coils 22a and 22b passing through the 0.2 A. The magnetic field and the magnetic field of the magnetic element 34 are in a balanced state, and the lens group 30 stays at the in-focus position (shown in Figure 4). Since the stiffness coefficient K1 of the elastic member 33 is much larger than the stiffness coefficient K2 of the axial direction, the movement of the lens group 30 in the case where the magnetic field of the magnetic member 34 is uneven in the circumferential direction can be prevented from being unbalanced, and the focusing accuracy is ensured. In addition, the magnetic pole direction of the magnetic element 34 may be other forms, such as an S pole at the upper end in the axial direction and an N pole at the lower end. In this case, a current of opposite directions is input to the upper and lower coils 22a and 22b. The stator assembly 20 may also be provided with only one stator base and one coil, such as the stator base 21a and the upper coil 22a or the lower stator base 21b and the lower coil 22b.

In different embodiments, the structure of the elastic member may vary, and the connection relationship between the elastic member, the magnetic member, and the lens barrel may also vary. FIG. 5 is an exploded perspective view showing a second embodiment of the lens assembly 30a of the camera module of the present invention. The structure of the elastic member 33a in the lens group 30a is substantially the same as that of the elastic member 33 in the first embodiment, and includes an inner ring 331a, an outer ring 333a, and a plurality of elastic pieces 335a connected between the inner ring 331a and the outer ring 333a. The inner ring 331a and the outer ring 333a are spaced apart from each other, except that the elastic piece 335a spirally extends upward from the inner circumference of the outer ring 333a to the outer circumference of the inner ring 331a, so that the inner ring 331a and the outer ring 333a forms a height difference in the axial direction (shown in Figure 6). When the lens barrel 31, the lens 32, the elastic member 33a and the magnetic element 34 are assembled together, the elastic member 33a and the magnetic member 34 are disposed around the periphery of the lens barrel 31, wherein the magnetic member 34 is disposed on the step portion 312, and the elastic member 33a The magnetic element 34 is disposed above the magnetic element 34, and the magnetic element 34 is interposed between the step portion 312 and the elastic member 33a. The outer ring 333a of the elastic member 33a is connected with the magnetic element 34 to fix one end of the elastic piece 335a with the lens assembly 30a. The inner ring 331a of the elastic member 33a is used to fix the other end of the elastic piece 335a to the stator assembly of a camera module. The inner ring 331a of the elastic member 33a may be connected to the magnetic element 34 to fix one end of the elastic piece 335a to the lens group 30a, so that the magnetic element 34 is interposed between the step portion 312 and the elastic member 33a, and the elastic member 33a The outer ring 333a is used to fix the other end of the elastic piece 335a to the stator assembly of a camera module, for example, the elastic member 33a is inverted and assembled.

As shown in FIG. 7, it is a schematic cross-sectional view of the lens group 30a applied to a camera module. The magnetic element 34 is disposed on the step portion 312 of the lens barrel 31. The elastic member 33a is disposed at the upper end of the magnetic member 34 and sandwiches the magnetic member 34 between the elastic member 33a and the step portion 312. The inner ring 331a of the elastic member 33a and the stator holder 21a of the stator assembly 20 are bonded to each other. The outer ring 333a of the elastic member 33a and the top end of the magnetic member 34 are bonded to each other. One end (moving end) of the elastic piece 335a is connected to the outer ring 333a, and the other end (fixed end) of the elastic piece 335a is connected to the inner ring 331a. It is assumed that the magnetic element 34 has an N pole at the upper end in the axial direction and an S pole at the lower end. In operation, the control power source respectively inputs current into the upper and lower coils 22a and 22b, so that the upper coil 22a is excited to generate an upper N pole and a lower The magnetic field of the S pole and the excitation of the lower coil 22b generate a magnetic field having an upper S pole and a lower N pole. The magnetic field of the upper coil 22a and the magnetic field of the magnetic element 34 attract each other, and the magnetic field of the lower coil 22b and the magnetic element 34 The magnetic fields repel each other so that the lens group 30a is driven to move upward together with the magnetic element 34 in the axial direction and is in focus, and the moving end of the elastic piece 335a (connected to one end of the outer ring 333a) follows the fixed end of the lens group 30a (connected thereto) One end of the ring 331a is moved upward to deform the elastic piece 335a to different degrees in the axial direction, thereby achieving the purpose of continuous focusing.

Please refer to FIG. 8 and FIG. 9 together, which are perspective views of the elastic member in the third embodiment of the lens assembly of the camera module of the present invention. The structure of the elastic member 33b is substantially the same as that of the elastic member 33a of the second embodiment, and includes an outer ring 333b and a resilient piece 335b extending upwardly from the inner periphery of the outer ring 333b. The difference is that the elastic member 33b does not include The inner ring 331a, the elastic piece 335b is evenly distributed inside the outer ring 333b in the circumferential direction. When assembled, the outer ring 333b of the elastic member 33b is connected to the stator assembly of a camera module to fix one end of the elastic piece 335b with the stator assembly of the camera module, and the other end of the elastic piece 335b (Free end) is connected to the magnetic member 34 to fix the elastic piece 335b to the lens group.

The lens group of the camera module of the present invention can be used in a camera module to perform continuous autofocusing on the camera module. The lens group of the camera module adopts a magnetic element and an elastic member around the lens barrel, and the elastic member includes At least one elastic piece, the elastic piece is connected and fixed on the lens group at one end, and the other end is connected and fixed to the stator set of a camera module. When the magnetic element is subjected to a magnetic field generated by the coil provided on the stator set, the magnetic element The lens group can be moved to focus, and one end of the elastic piece and the lens group is fixed to be deformed relative to the other end of the elastic piece for fixing with the stator set of the camera module to realize continuous autofocus. Compared with the lens group in which the coil is arranged around the lens barrel, the lens group of the camera module of the present invention has a simple structure, and when the lens group of the camera module is assembled into a camera module, only the shrapnel is needed. The other end is fixed to the stator assembly of the camera module, and the assembly is convenient.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

Enclosure ‧‧10

Stator group ‧ ‧ 20

Upper stator ‧‧21a

Lower stator seat ‧‧21b

Upper coil ‧‧22a

Lower coil ‧‧22b

Space ‧‧23

Containment space ‧ ‧ 24

Lens group ‧ ‧ 30, 30a

Mirror ‧‧31

Containing holes ‧‧ 311

Steps ‧‧ 312

Lens ‧‧32

Elastic parts ‧‧33,33a,33b

Inner ring ‧ ‧ 331, 331a

Outer ring ‧‧‧333, 333a, 333b

Shrapnel ‧ ‧ 335, 335a, 335b

Magnetic components ‧‧‧34

Round hole ‧‧ 336

1 is a perspective view of a preferred embodiment of a lens assembly of a camera module of the present invention.

2 is an exploded perspective view of FIG. 1.

FIG. 3 is a cross-sectional view showing the lens group of the camera module shown in FIG. 1 applied to a camera module.

4 is a cross-sectional view showing the lens group in the camera module of FIG. 3 in a state of focus.

Figure 5 is a perspective exploded view of a second embodiment of a lens assembly of the camera module of the present invention.

Figure 6 is a front elevational view of the elastic member of Figure 5.

FIG. 7 is a cross-sectional view showing the lens group of the camera module shown in FIG. 5 applied to a camera module.

Figure 8 is a perspective view of the elastic member in the third embodiment of the lens assembly of the camera module of the present invention.

Figure 9 is a front elevational view of the elastic member of Figure 8.

Lens group ‧ ‧ 30

Mirror ‧‧31

Containing holes ‧‧ 311

Steps ‧‧ 312

Lens ‧‧32

Elastic parts ‧‧33

Inner ring ‧ ‧ 331

Outer ring ‧ ‧ 333

Shrapnel ‧ ‧ 335

Magnetic components ‧‧‧34

Round hole ‧‧ 336

Claims (16)

A lens assembly of a camera module, comprising a lens barrel and a lens received in the lens barrel, the improvement comprising: further comprising a magnetic component and an elastic member disposed around the periphery of the lens barrel, the elastic component comprising at least a spring piece, one end of the elastic piece is fixedly connected with the lens group, and the other end of the elastic piece is used for connecting and fixing with the stator set of a camera module, and the elastic element is driven by the external magnetic field to drive the lens group to move. The lens is connected to the lens group to fix one of the end-following lens groups to move relative to the other end of the elastic piece to deform the elastic piece. The lens assembly of the camera module of claim 1, wherein the elastic member further includes an inner ring and an outer ring, the outer ring and the inner ring are spaced apart from each other, and the elastic piece is coupled to the inner ring and Between the outer rings. The lens assembly of the camera module of claim 2, wherein the inner ring of the elastic member is connected to the lens group, and the outer ring of the elastic body is used for connecting with the stator assembly of the camera module. The lens assembly of the camera module of claim 3, wherein the inner ring of the elastic member is fixedly connected to the magnetic component of the lens group. The lens assembly of the camera module of claim 2, wherein the outer ring of the elastic member is connected to the lens group, and the inner ring of the elastic body is used for connecting with the stator assembly of the camera module. The lens assembly of the camera module of claim 5, wherein the outer ring of the elastic member is fixedly connected to the magnetic component of the lens group. The lens assembly of the camera module of claim 2, wherein the inner ring, the elastic piece and the outer ring of the elastic body are located on the same plane. The lens assembly of the camera module of claim 7, wherein a peripheral portion of the lens barrel is provided with a step portion, and an inner ring of the elastic member is fixed to the magnetic member and sandwiched between the magnetic member and the step portion. The outer ring of the elastic member is used to connect with the stator assembly of the camera module. The lens assembly of the camera module of claim 2, wherein the inner ring and the outer ring of the elastic member form a height difference in the axial direction. The lens unit of the camera module of claim 9, wherein the outer ring of the lens barrel is provided with a step portion, and the magnetic element is disposed on the step portion and fixed to the lens barrel, outside the elastic member The ring is fixed on the magnetic element and the magnetic element is interposed between the elastic member and the step. The lens unit of the camera module of claim 9, wherein the outer ring of the lens barrel is provided with a step portion, and the magnetic component is disposed on the step portion and fixed to the lens barrel, and the elastic member is The ring is fixed on the magnetic element and the magnetic element is interposed between the elastic member and the step. The lens unit of the camera module of claim 2, wherein the number of the elastic pieces is plural, and the plurality of elastic pieces are evenly distributed in the circumferential direction between the inner ring and the outer ring. The lens assembly of the camera module of claim 1, wherein the elastic member further comprises an outer ring, and one end of the elastic piece is connected to the outer ring, and the outer ring is used for the stator assembly of the camera module. Fixed, the other end of the elastic piece is a free end, and the free end is connected to the lens group. The lens unit of the camera module of claim 13, wherein the number of the elastic pieces is plural, the plurality of elastic pieces are evenly distributed in the circumferential direction on the inner side of the outer ring, and one end of the elastic piece and the free end edge thereof Axial shape Into a height difference. The lens assembly of the camera module of claim 1, wherein the magnetic component is a ring magnet. The lens assembly of the camera module of claim 1, wherein the N and S poles of the magnetic component are respectively located at two ends of the magnetic component in the axial direction.