CN220040850U

CN220040850U - Lens driving device based on SMA assembly

Info

Publication number: CN220040850U
Application number: CN202321701407.8U
Authority: CN
Inventors: 鲍和平; 彭坤; 林聪�; 刘富泉; 吕新科
Original assignee: Henan Hozel Electronics Co Ltd
Current assignee: Henan Hozel Electronics Co Ltd
Priority date: 2023-06-30
Filing date: 2023-06-30
Publication date: 2023-11-17
Anticipated expiration: 2033-06-30

Abstract

The utility model belongs to the technical field of optical imaging equipment, and particularly relates to a lens driving device based on an SMA component, which comprises a shell, a base, a driving component, a carrier and a frame, wherein the driving component comprises a plurality of SMA components, a zoom magnet and a zoom coil; the SMA component is arranged on the base, and the moving end of the SMA component is abutted against the outer wall of the frame; the zoom magnet is arranged on the inner wall of the frame, the zoom coil is arranged on the outer side of the carrier, and the zoom magnet is arranged opposite to the zoom coil; further comprises: the control IC circuit is arranged in the frame and connected with the built-in circuit of the frame; the upper reed is respectively connected with the frame and the carrier, the outer end of the upper reed is connected with the control IC circuit through a built-in circuit of the frame, and the inner end of the upper reed is connected with the zoom coil; the pre-pressing reed is respectively connected with the bottom end of the frame and the bottom end inside the base, and the built-in circuit of the base is connected with the built-in circuit of the frame. The utility model realizes the power supply, the power-on control and the communication of the light and miniaturized lens driving device through reasonable design.

Description

Lens driving device based on SMA assembly

Technical Field

The utility model belongs to the technical field of optical image equipment, and particularly relates to a lens driving device.

Background

With the development of technology, many electronic devices (such as smart phones or digital cameras) have photographing or video recording functions. The use of these electronic devices is becoming more and more popular and is evolving towards a convenient and light-weight design that provides more options for the user.

Some electronic devices with photographing or video recording function are provided with a lens driving device to drive an Optical component such as a lens to move, so as to achieve the functions of Optical vibration prevention (Optical ImageStabilization, OIS) and auto focus (auto focus). The light can be imaged through the optical assembly onto the photosensitive assembly.

The OIS driving device commonly used at present includes Voice Coil Motor (VCM), shape memory alloy (shape memory alloys, SMA), piezoelectric, stepping motor, etc. The SMA type OIS device uses an SMA technology to drive the lens to realize optical anti-shake, and has the advantages of small driving volume, high efficiency, high speed, low power consumption, small sound and the like.

The automatic focusing generally adopts the action of a zoom coil and a magnet, and the carrier and the lens move along the Z-axis direction. The device used for automatic focusing is usually independent of the device used for optical anti-shake, and the device used for automatic focusing is usually arranged at a position far away from the base, and the base is usually provided with a power supply interface/pin and an interface/pin for communicating with an external device. Therefore, the energization and control of the zoom coil is one of the designs that are required to be paid attention to the weight reduction and miniaturization of electronic products.

Disclosure of Invention

The present utility model is directed to the above technical problems, and an object of the present utility model is to provide a lens driving device based on an SMA assembly.

In order to solve the above problems, according to one aspect of the present utility model, there is provided a lens driving device based on SMA assembly, including a housing, a base, a driving assembly, a carrier and a frame, wherein a hollow cavity is provided between the housing and the base, the carrier is disposed in the frame, the frame and the driving assembly are both disposed in the hollow cavity, and the driving assembly includes several SMA assemblies, a zoom magnet and a zoom coil;

the SMA component is arranged on the base, the moving end of the SMA component is abutted against the outer wall of the frame, and the SMA component is configured to push the frame to move along a preset direction through the moving end after being electrified;

the zoom magnet is arranged on the inner wall of the frame, the zoom coil is arranged on the outer side of the carrier, and the zoom magnet and the zoom coil are arranged oppositely;

further comprises:

the control IC circuit is arranged in the frame and connected with the built-in circuit of the frame;

the upper reed is positioned at the top ends of the carrier and the frame and is respectively connected with the frame and the carrier, the outer end of the upper reed is connected with the control IC circuit through the built-in circuit of the frame, and the inner end of the upper reed is connected with the zoom coil;

the pre-pressing reed is positioned at the bottom end of the frame and is respectively connected with the bottom end of the frame and the bottom end inside the base, and the pre-pressing reed connects the built-in circuit of the base with the built-in circuit of the frame.

According to the utility model, the SMA components arranged on the periphery of the base push the frame to move in the X axis and the Y axis in the hollow cavity, and the carrier moves in the Z axis direction relative to the frame under the cooperation of the zoom coil and the zoom magnet, so that the triaxial moving operation of the lens is realized due to the fact that the lens is arranged in the carrier. Due to the structural design of the upper reed, the upper reed can play an auxiliary resetting effect when the carrier moves in the Z-axis direction relative to the frame under the elastic action of the upper reed. Due to the structural design of the pre-pressing reed, under the elastic action of the pre-pressing reed, when the frame moves relative to the base in the X axis and the Y axis, the pre-pressing reed can play an auxiliary resetting effect.

The utility model provides a zoom coil, which is arranged outside a carrier, and a frame is arranged between the zoom coil and a base, so that direct power supply or control cannot be realized, therefore, the utility model realizes the connection with the base built-in circuit through the frame built-in circuit and a pre-pressing reed by using a control IC circuit for controlling the power supply condition of the zoom coil, supplies the current of a pin on the base to the control IC circuit through the base built-in circuit, realizes the power supply or communication of the control IC circuit, and realizes the power supply condition control of the zoom coil by connecting the control IC circuit with the zoom coil through the frame built-in circuit and an upper reed.

Optionally, the method further comprises:

the periphery of the lower reed is connected with the bottom end inside the frame, and the inner periphery of the lower reed is connected with the bottom end of the carrier.

Optionally, the number of the zoom magnets is two, and the two zoom magnets are respectively arranged on the inner walls of the two opposite sides of the frame;

the number of the zoom coils is two, and the two zoom coils are respectively arranged on the outer walls of the two pairs of sides of the carrier.

Optionally, the upper reed includes two upper reed pieces, each upper reed piece is connected respectively the frame with the carrier, each upper reed piece's outer end through the built-in circuit of frame with control IC circuit connection, each upper reed piece's inner with corresponding one zoom coil is connected.

Optionally, the method further comprises:

the Z-axis induction capacitor is arranged on the inner wall of the frame and is connected with the control IC circuit;

the Z-axis induction magnet is arranged outside the carrier and opposite to the Z-axis induction capacitor.

Optionally, the method further comprises:

the four supporting blocks are respectively arranged at the periphery of the bottom end inside the base, the frame is arranged above the supporting blocks, and the frame is supported by the supporting blocks;

the supporting block is made of an anti-friction material or at least the top end is an anti-friction material layer.

Optionally, grooves are respectively formed in the periphery of the base, and the SMA component is installed through the grooves.

Optionally, the method further comprises:

the two position sensors are respectively arranged at the bottom end in the base;

the X-axis induction magnet is arranged at the bottom end of the frame and is opposite to one of the position sensors;

the Y-axis induction magnet is arranged at the bottom end of the frame and is opposite to the other position sensor, and the Y-axis induction magnet and the X-axis induction magnet are respectively positioned at the bottom ends of two adjacent sides of the frame.

Optionally, the SMA assembly includes:

the fixed plate is fixed on the base;

the elastic piece is positioned at the inner side of the fixed plate, one end of the elastic piece is connected with the fixed plate at the outer side, the other end of the elastic piece is a free end, and the free end is used as the moving end to be abutted against the outer wall of the frame;

and the two ends of the memory alloy wire are respectively connected with the inner sides of the two ends of the elastic sheet, and the memory alloy wire is connected with the built-in circuit of the base.

Optionally, a bending part is arranged in the middle of the elastic sheet;

the fixing plate is provided with an avoidance groove, and the avoidance groove is positioned at the outer side of the bending part.

The beneficial effects are that: the utility model realizes the power supply, the power-on control and the communication of the light and miniaturized lens driving device through reasonable design of the control IC circuit, the upper reed and the pre-pressing reed.

Drawings

FIG. 1 is an exploded view of the present utility model;

FIG. 2 is a further exploded view of the frame of FIG. 1 positioned within a base;

FIG. 3 is a further exploded view of the carrier of FIG. 1 positioned within a frame;

FIG. 4 is a further exploded view of FIG. 1;

FIG. 5 is an exploded view of the base of the present utility model between frames with carriers built in;

FIG. 6 is a schematic illustration of the connection of the frame to the preload spring of the present utility model;

FIG. 7 is a schematic view of the bottom end of the frame of the present utility model;

FIG. 8 is a schematic view of a structure of an SMA assembly of the present utility model.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present utility model will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the utility model, but rather are merely illustrative of the true spirit of the utility model.

In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with the present utility model may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present utility model, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.

Referring to fig. 1 to 8, the present utility model provides a lens driving device based on SMA assembly, comprising a housing 1, a base 2, a driving assembly, a carrier 4 and a frame 5, the driving assembly comprising a plurality of SMA assemblies 31, a zoom magnet 32 and a zoom coil 33. A hollow cavity is formed between the shell 1 and the base 2, and the shell 1 and the base 2 are preferably connected through buckling to form the hollow cavity. The carrier 4 is arranged in the frame 5, the frame 5 and the driving component are both arranged in the hollow cavity, and the middle part of the lens driving device is axially provided with a lens through hole which is axially communicated so as to accommodate the lens.

The SMA assembly 31 is disposed on the base 2, a moving end of the SMA assembly 31 abuts against an outer wall of the frame 5, and the SMA assembly 31 is configured to push the frame 5 to move along the X-axis and the Y-axis directions through the moving end after being electrified, so as to drive the carrier 4 in the frame 5 to move along the X-axis and the Y-axis directions.

The zoom magnet 32 is arranged on the inner wall of the frame 5, the zoom coil 33 is arranged on the outer side of the carrier 4, the zoom magnet 32 and the zoom coil 33 are oppositely arranged, the carrier 4 moves in the Z-axis direction relative to the frame 5 under the matching action of the zoom coil 33 and the zoom magnet 32, and the lens is arranged in the carrier 4, so that the triaxial moving operation of the lens is realized.

The zoom coil 33 can realize the Z-axis direction movement by matching with the zoom magnet 32 after being electrified, and the zoom coil 33 is arranged outside the carrier 4, and cannot realize direct electrifying or controlling due to the frame 5 arranged between the zoom coil 33 and the base 2, so the utility model also comprises a control IC circuit 6, an upper reed 71 and a pre-pressing reed 72.

The control IC circuit 6 is provided in the frame 5, the control IC circuit 6 is connected to a built-in circuit of the frame, and the control IC circuit 6 is used to control the energizing state of the zoom coil 33, and an integrated circuit for controlling the energizing of the coil in the prior art may be used. The built-in circuit of the frame serves as an electric connection and signal connection bridge for electrically and signal connection of the control IC circuit 6 with other devices outside the frame 5.

The upper reed 71 is located at the top ends of the carrier 4 and the frame 5, the upper reed 71 is connected to the frame 5 and the carrier 4, respectively, the outer end of the upper reed 71 is connected to the control IC circuit 6 through a built-in circuit of the frame, and the inner end of the upper reed 71 is connected to the zoom coil 33. The control IC circuit 6 is connected to the zoom coil 33 via a built-in circuit of the frame and the upper reed 71, and controls the current flowing state of the zoom coil 33.

The pre-pressing reed 72 is positioned at the bottom end of the frame 5, the pre-pressing reed 72 is respectively connected with the bottom end of the frame 5 and the bottom end inside the base 2, and the pre-pressing reed 72 connects the built-in circuit of the base with the built-in circuit of the frame. The control IC circuit 6 is connected with the base built-in circuit through the frame built-in circuit and the pre-pressing reed 72, and the current of the pins on the base 2 is supplied to the control IC circuit 6 through the base built-in circuit, so that the power supply or communication of the control IC circuit 6 is realized.

Meanwhile, due to the structural design of the upper reed 71, the upper reed 71 can play an auxiliary resetting role when the carrier 4 moves in the Z-axis direction relative to the frame 5 under the elastic action of the upper reed 71. Due to the structural design of the pre-pressing reed 72, under the elastic action of the pre-pressing reed 72, when the frame 5 moves relative to the base 2 in the X axis and the Y axis, the pre-pressing reed 72 can play an auxiliary resetting effect.

In one embodiment, the SMA assembly-based lens driving apparatus further includes a lower reed 73, an outer circumference of the lower reed 73 is connected to an inner bottom end of the frame 5, and an inner circumference of the lower reed 73 is connected to a bottom end of the carrier 4. Under the elastic action of the lower reed 73, the lower reed 73 can play an auxiliary resetting role when the carrier 4 moves in the Z-axis direction relative to the frame 5.

In an embodiment, referring to fig. 4, the lower reed 73 may include an integrally provided elastic ring and four bent lower chord wires disposed around the elastic ring, one end of each lower chord wire is integrally fixed with the elastic ring, and the other end of each lower chord wire is integrally connected with a lower frame fixing piece, where the lower frame fixing piece is used for being fixed with the bottom end of the frame 5. The four lower chord wires can be uniformly arranged around the elastic piece circular ring at an angle of 90 degrees. A lower carrier fixing piece is integrally arranged on the elastic piece ring between two adjacent lower chord wires and is used for being fixed with the bottom end of the carrier 4.

In an embodiment, referring to fig. 2 and 4, the number of the zoom magnets 32 is two, and the two zoom magnets 32 are respectively disposed on the two opposite side inner walls of the frame 5. The number of the zoom coils 33 is two, and the two zoom coils 33 are respectively arranged on two opposite side outer walls of the carrier 4.

In one embodiment, the upper reed 71 includes two upper reed pieces 711, each upper reed piece 711 is connected to the frame 5 and the carrier 4, respectively, the outer end of each upper reed piece 711 is connected to the control IC circuit 6 through a frame built-in circuit, and the inner end of each upper reed piece 711 is connected to a corresponding one of the zoom coils 33. To realize that the control IC circuit 6 is connected to the corresponding two zoom coils 33 via two independent sprung tabs 711, respectively.

In an embodiment, the spring supporting piece 711 may be a spring leaf which is capable of connecting the frame 5 and the carrier 4 respectively and achieving auxiliary reset in the prior art. In another embodiment, referring to fig. 2 and 4, the upper spring supporting piece 711 includes an integrally made arc section, two bent upper chord wires, two carrier fixing pieces and two upper frame fixing pieces, two ends of the arc section are respectively integrally connected with one carrier fixing piece, one end of the upper chord wire is connected to the outer side of the carrier fixing piece, the other end of the upper chord wire is connected with one upper frame fixing piece, the carrier fixing piece is used for being fixed with the top end of the carrier 4, and the upper frame fixing piece is used for being fixed with the top end of the frame 5.

In one embodiment, referring to FIG. 2, the SMA assembly-based lens drive device further includes a Z-axis induction capacitor 81 and a Z-axis induction magnet 82. The Z-axis sensing capacitor 81 is disposed on the inner wall of the frame 5, and the Z-axis sensing capacitor 81 is connected to the control IC circuit 6. The Z-axis induction magnet 82 is disposed outside the carrier 4, and the Z-axis induction magnet 82 is disposed opposite to the Z-axis induction capacitor 81.

The Z-axis position of the carrier is monitored by matching the Z-axis induction magnet 82 with the Z-axis induction capacitor 81.

In one embodiment, the Z-axis sensing capacitor 81 is disposed on the side of the control IC circuit 6. In another embodiment, a receiving cavity is dug on the inner wall of the frame 5, and the Z-axis sensing capacitor 81 and the control IC circuit 6 are disposed in the receiving cavity.

In an embodiment, referring to fig. 4 and 5, the lens driving device based on the SMA assembly further includes four supporting blocks 9, the four supporting blocks 9 are respectively disposed around the bottom end inside the base 2, the frame 5 is disposed above the supporting blocks 9, and the supporting blocks 9 support the frame 5.

The support block 9 may be an anti-friction support block made of an anti-friction material.

A layer of friction-resistant material may also be provided on at least the top end of the support block 9.

By the arrangement of the supporting blocks 9, the frame 5 can be completely supported, and friction to the inner end wall of the base 2 when the frame 5 moves along the X axis and the Y axis is avoided.

In one embodiment, grooves are formed around the base 2, and SMA assemblies 31 are mounted through the grooves. So that the SMA assemblies 31 in this embodiment are four, and the four SMA assemblies are respectively disposed around the base 2. In another embodiment, two SMA assemblies on opposite sides are used to control movement of the frame 5 in the X-axis direction and two SMA assemblies on opposite sides are used to control movement of the frame 5 in the Y-axis direction.

In one embodiment, referring to fig. 3, 4, 5 and 7, the SMA assembly-based lens driving apparatus further includes two position sensors 83, an X-axis induction magnet 84 and a Y-axis induction magnet 85. Two position sensors 83 are respectively provided at the bottom ends in the base 2. The X-axis sensing magnet 84 is disposed at the bottom end of the frame 5, and the X-axis sensing magnet 84 is disposed opposite to one of the position sensors 83. The Y-axis induction magnet 85 is arranged at the bottom end of the frame 5, the Y-axis induction magnet 85 is arranged opposite to the other position sensor 83, and the Y-axis induction magnet 85 and the X-axis induction magnet 84 are respectively arranged at the bottom ends of two adjacent sides of the frame 5.

The two position sensors 83 are respectively engaged with an X-axis induction magnet 84 and a Y-axis induction magnet 85 provided at the bottom end of the frame 5, and are used for monitoring the positions of the frame 5 in the X-axis direction and the Y-axis direction.

In one embodiment, referring to fig. 8, the sma assembly 31 includes a fixed plate 311, a spring plate 312, and at least one memory alloy wire 313. The fixing plate 311 is fixed to the base 2, for example, when a groove is provided on the base 2, the fixing plate 311 is fixed in the groove. The elastic piece 312 is located at the inner side of the fixed plate 311, one end of the elastic piece 312 is connected with the fixed plate 311, and the other end of the elastic piece 312 is a free end, i.e. the other end of the elastic piece 312 is not connected with the fixed plate 311, and the free end is used as a moving end to abut against the outer wall of the frame 5. The two ends of the memory alloy wire 313 are respectively connected with the inner sides of the two ends of the elastic sheet 312, and the memory alloy wire 313 is connected with the built-in circuit of the base so as to be connected with an interface/pin on the base through the built-in circuit of the base.

Alternatively, any one of the SMA assemblies includes only one spring 312, and the spring 312 is integrally formed and has a substantially equal width, that is, the spring 312 is an integral spring and drives the frame to move by bending the integral spring. Compared with the scheme that only one part of the elastic sheet is utilized to carry out bending deformation to drive the frame to move, the scheme has larger driving force and higher strength, is not easy to damage in the frequent reciprocating motion of the elastic sheet, and has longer service life.

When the SMA assembly 31 of this embodiment is used, the memory alloy wire 313 is energized through the built-in circuit of the base, the memory alloy wire 313 deforms, when the memory alloy wire 313 contracts, the memory alloy wire 313 pulls the free end of the elastic piece 312 to move towards the frame 5, and when the free end moves, the free end pushes the frame 5 to realize movement of the frame 5; when the memory alloy wire 313 is restored to its original state, the spring piece 312 is restored to its original state, and the frame 5 is restored by the pre-pressing spring piece 72.

In one embodiment, the length direction of the memory alloy wire 313 is identical to the length direction of the spring plate 312.

In an embodiment, one or more memory alloy wires 313 may be provided according to the specifications of the spring 312, such as height or thickness, so as to pull the free end of the spring 312 to move toward the frame 5 when the memory alloy wires 313 are electrically deformed.

Referring to fig. 8, the number of the memory alloy wires 313 is two, and the two memory alloy wires 313 are arranged side by side in a vertical direction, i.e., in an up-down direction, perpendicular to the length direction.

In an embodiment, referring to fig. 8, a bending portion 312a is disposed at a middle portion of the elastic sheet 312, and the bending portion 312a is a bending portion 312a that bends outwards. The fixing plate 311 is provided with a relief groove 311a, and the relief groove 311a is located outside the bending portion 312a.

According to the design of the bending part 312a, the elastic sheet 312 can be easily bent and deformed when the memory alloy wire 313 pulls the two ends of the elastic sheet 312, so that the frame 5 is better pushed, and correspondingly, the avoiding groove 311a is designed for avoiding the bending part 312a, and meanwhile, the avoiding groove 311a can vacate a certain space for bending of the elastic sheet 312, so that the bending action of the elastic sheet 312 is not hindered.

While the preferred embodiments of the present utility model have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the utility model. Such equivalents are also intended to fall within the scope of the utility model as defined by the following claims.

Claims

1. The lens driving device based on the SMA component comprises a shell, a base, a driving component, a carrier and a frame, wherein a hollow cavity is arranged between the shell and the base, the carrier is arranged in the frame, the frame and the driving component are both arranged in the hollow cavity, and the driving component comprises a plurality of SMA components, a zoom magnet and a zoom coil;

the SMA assembly is arranged on the base, the moving end of the SMA assembly is abutted against the outer wall of the frame, and the SMA assembly is configured to push the frame to move along a preset direction through the moving end after being electrified;

further comprises:

2. An SMA assembly-based lens driving apparatus as claimed in claim 1, further comprising:

3. A SMA assembly-based lens driving apparatus as claimed in claim 1, wherein the number of the zoom magnets is two, and the two zoom magnets are respectively disposed on two opposite side inner walls of the frame;

4. A SMA assembly-based lens driving apparatus as claimed in claim 3, wherein the upper reed comprises two upper reed pieces, each upper reed piece is connected to the frame and the carrier, respectively, an outer end of each upper reed piece is connected to the control IC circuit through a frame built-in circuit, and an inner end of each upper reed piece is connected to a corresponding one of the zoom coils.

5. An SMA assembly-based lens driving apparatus as claimed in claim 1, further comprising:

6. An SMA assembly-based lens driving apparatus as claimed in claim 1, further comprising:

7. A SMA assembly-based lens driving apparatus as claimed in claim 1, wherein grooves are provided around the base, respectively, and the SMA assembly is mounted through the grooves.

8. An SMA assembly-based lens driving apparatus as claimed in claim 1, further comprising:

9. An SMA assembly-based lens driving apparatus according to any one of claims 1 to 8, wherein the SMA assembly comprises:

the fixed plate is fixed on the base;

10. The SMA assembly-based lens driving apparatus according to claim 9, wherein a bending part is provided at a middle part of the elastic sheet;