CN109061829B - Lens driving device and camera module - Google Patents
Lens driving device and camera module Download PDFInfo
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- CN109061829B CN109061829B CN201811070509.8A CN201811070509A CN109061829B CN 109061829 B CN109061829 B CN 109061829B CN 201811070509 A CN201811070509 A CN 201811070509A CN 109061829 B CN109061829 B CN 109061829B
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- lens driving
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- 230000003287 optical effect Effects 0.000 claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims description 19
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lens Barrels (AREA)
Abstract
The invention discloses a lens driving device and a camera module, wherein a first driving module is connected with a first bracket and a second bracket, a gap is formed between the first bracket and the second bracket, a driving wire is connected with a third bracket and the second bracket, and an elastic piece is arranged between the third bracket and the second bracket. And the first driving module and/or the driving wire are/is controlled to stretch and retract under the control of applying a driving signal to the first driving module and/or the driving wire so as to drive the first bracket and the second bracket to move relatively along the optical axis direction and/or control the distance between the third bracket and the second bracket. Therefore, coarse adjustment of displacement between the brackets can be realized, accurate adjustment of displacement can be realized, the adjustment precision of displacement between the brackets is improved, and the focusing precision of the optical lens group is further improved.
Description
Technical Field
The invention relates to the field of camera application, in particular to a lens driving device and a camera module.
Background
In mobile devices, a camera module for photographing or video recording is generally provided. The camera module may further include an optical lens assembly in addition to the photosensitive element (e.g., image sensor) for sensing light. In some high-end camera modules, the optical lens group can do a motion parallel to or perpendicular to the light receiving surface of the photosensitive element, so as to counteract image shake caused by equipment shake or perform automatic focusing. Conventional optical image stabilization systems or optical anti-shake systems are typically implemented using a voice coil motor to drive a lens mount. However, the voice coil motor has a complex structure, and is difficult to realize thinning; meanwhile, a large number of magnets are arranged in the voice coil motor, and mutual interference is easy to occur when the multi-module is used in parallel and close.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a lens driving device and an image capturing module, which can improve the focusing accuracy of an optical lens assembly.
According to a first aspect of an embodiment of the present invention, there is provided a lens driving apparatus including:
A first bracket for fixing the optical lens group;
a second bracket and a third bracket;
at least one first driving module connecting the first and second brackets and forming a gap therebetween, the first driving module being configured to be controlled to be telescopic to drive the first and second brackets to relatively move in an optical axis direction; and
At least one second driving module configured to be controlled to be telescopic to drive the second and third brackets to relatively move in the optical axis direction;
The second driving module comprises an elastic piece and a driving wire, wherein the elastic piece is arranged between a third bracket and a second bracket, the driving wire is connected with the third bracket and the second bracket, and the driving wire is controlled to stretch and retract so as to control the distance between the third bracket and the second bracket;
The displacement precision of the first driving module for driving the first bracket and the second bracket to move relatively is different from the displacement precision of the driving wire for driving the second bracket and the third bracket to move relatively.
Preferably, the lens driving apparatus further includes:
One end of the at least two guide rods is fixedly connected with the third bracket;
the second support is provided with at least two guide holes, and the other end of the guide rod penetrates through the corresponding guide holes to guide the second support and the third support to move relatively along the optical axis direction.
Preferably, the first bracket is provided with a hole at a position opposite to the guide hole, and the hole of the first bracket is sleeved on the guide rod in a relatively movable manner.
Preferably, the elastic piece is a spring and sleeved on the guide rod.
Preferably, two ends of the driving wire are fixed on the third bracket, and the middle part is fixed on the second bracket; or alternatively
The two ends of the driving wire are fixed on the second bracket, and the middle part is fixed on the third bracket.
Preferably, the lens driving apparatus further includes:
And the driving wire bypasses the prestress adjusting screw to be connected with the second bracket.
Preferably, the tail end of the prestress adjusting screw is of a circular variable cross-section structure.
Preferably, the second bracket is provided with a wire guiding groove for guiding the driving wire.
Preferably, the lens driving apparatus further includes:
And the two ends of the driving wire are respectively and electrically connected with the corresponding first electrodes and are used for receiving driving signals to stretch and retract.
Preferably, the first electrode has elasticity;
The third support comprises a first component and a second component which are enclosed to form a containing space for containing the first electrode.
Preferably, the first electrode has elasticity;
The second bracket comprises a third component and a fourth component, and the third component and the fourth component enclose a containing space for containing the first electrode.
Preferably, the first driving module is a piezoelectric ceramic plate or a stacked piezoelectric ceramic, and the driving wire is a shape memory alloy wire.
Preferably, the second bracket and the third bracket have guide grooves;
The lens driving apparatus further includes:
At least two second electrodes electrically connected to the first driving module through the guide grooves.
According to a second aspect of an embodiment of the present invention, there is provided an image capturing module including:
A lens housing;
the lens driving device according to the first aspect, provided in the lens housing;
an optical lens group arranged in the lens driving device;
And the photosensitive element is arranged opposite to the optical lens group.
The embodiment of the invention discloses a lens driving device and an image pickup module, wherein a first driving module is connected with a first bracket and a second bracket, a gap is formed between the first bracket and the second bracket, a driving wire is connected with a third bracket and the second bracket, and an elastic piece is arranged between the third bracket and the second bracket. And the first driving module and/or the driving wire are/is controlled to stretch and retract under the control of applying a driving signal to the first driving module and/or the driving wire so as to drive the first bracket and the second bracket to move relatively along the optical axis direction and/or control the distance between the third bracket and the second bracket. Therefore, coarse adjustment of displacement between the brackets can be realized, accurate adjustment of displacement can be realized, the adjustment precision of displacement between the brackets is improved, and the focusing precision of the optical lens group is further improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a perspective view of a lens driving apparatus according to an embodiment of the present invention;
Fig. 2 is a front view of a lens driving apparatus according to an embodiment of the present invention;
Fig. 3 is a left side view of a lens driving apparatus according to an embodiment of the present invention;
FIG. 4 is a front view of a drive line bypass prestress adjustment screw according to an embodiment of the invention;
FIG. 5 is a top view of a drive wire bypass prestress adjustment screw according to an embodiment of the invention;
Fig. 6 is a schematic structural view of a lens driving apparatus according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an image capturing module according to an embodiment of the present invention.
Detailed Description
The present invention is described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. The present invention will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the invention.
Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to achieve miniaturization of the structure and reduce the influence of electromagnetic interference, driving of the lens support is achieved according to the characteristics of the shape memory alloy (Shape Memory Al l oy, SMA) material, and then automatic focusing or optical anti-shake of the camera module are achieved. SMA materials have two phases (lattice states): a martensite phase and an austenite phase. When the temperature of the SMA material itself or the outside temperature changes, the lattice state inside the SMA material is converted between the martensite phase and the austenite phase, the length of the SMA material (such as the SMA wire) stretches out and draws back, and the voice coil motor can be replaced to push the optical lens group to realize automatic focusing or optical anti-shake.
However, in an auto-focus or optical anti-shake optical lens group made of SMA material, the accuracy of displacement control can generally be only on the order of 0.2%. For example, the maximum deformation amount is 0.5mm, and the corresponding displacement control accuracy is 1um. SMA materials cannot meet the displacement control requirements of high resolution camera systems for pixels above 20M. Therefore, the embodiment of the invention provides a lens driving device which can realize coarse adjustment of the focal length of the optical lens group and fine adjustment of the optical lens group.
Fig. 1 to 3 are schematic structural views of a lens driving apparatus according to an embodiment of the present invention. As shown in fig. 1 to 3, the lens driving apparatus a includes a first bracket 1, a second bracket 2, a third bracket 3, a first driving module 4, and a second driving module 5. Wherein, the both ends of the first driving module 4 are respectively connected with the first bracket 1 and the second bracket 2. A predetermined gap is formed between the first bracket 1 and the second bracket 2, and when the first driving module 4 is controlled to stretch, the first bracket 1 and the second bracket 2 are driven by the first driving module 4 to move relatively. When the first driving module 4 is controlled to be expanded and contracted, the first and second brackets 1 and 2 are driven to relatively move in the optical axis direction to change the interval between the first and second brackets 1 and 2. In this embodiment, the top of the first bracket 1 is provided with a light hole 11, and when the optical lens group C is fixed in the first bracket 1, the light beam enters the optical lens group C through the light hole 11. When the first and second holders 1 and 2 are relatively moved, the focal length of the optical lens can be adjusted.
The second drive module 5 includes an elastic member 51 and a drive wire 52. Wherein the elastic member 51 is disposed between the second bracket 2 and the third bracket 3 such that a gap is formed between the second bracket 2 and the third bracket 3 and has a tendency to be apart from each other. The drive line 52 connects the second bracket 2 and the third bracket 3, exerting a force that brings them closer to each other. The distance between the third support 3 and the second support 2 can be controlled by controlled extension and retraction of the drive wire 52. When the driving wire 52 is in a relaxed state, the distance between the second bracket 2 and the third bracket 3 is restored to the original distance by the elastic force of the elastic member 51.
In this embodiment, the upper and lower ends of the first driving module 4 are fixedly connected to the first bracket 1 and the second bracket 2, respectively. The fixing mode can be adhesive connection or welding. In an alternative implementation, the first driving module 4 may be a piezoelectric ceramic sheet or a stacked piezoelectric ceramic. According to the inverse piezoelectric effect of the piezoelectric ceramics, when an electric field is applied to the first driving module 4, the dielectric medium in the first driving module 4 is mechanically deformed in the height direction (electric field direction), changing the dimension of the first driving module 4 in the height direction, and further changing the interval between the first and second brackets 1 and 2 fixedly connected thereto. The maximum displacement of the piezoelectric ceramic is typically 0.1% of its size. For example, the maximum displacement of 4mm high piezoelectric ceramics is 4um, and the repeated positioning accuracy is 0.01um. Therefore, the first bracket 1 and the second bracket 2 can be finely adjusted with high precision through the inverse piezoelectric effect of the piezoelectric ceramics so as to meet the requirements of a high-pixel shooting system.
When the first driving module 4 is a stacked piezoelectric ceramic, the stacked piezoelectric ceramic is composed of n piezoelectric ceramic plates, which are mechanically connected in series, and electrically connected in parallel, so that the driving voltage applied to the first driving module 4 can be effectively reduced, and the lens driving device a of the embodiment can be suitable for portable electronic equipment driven by a battery. The upper end and the lower end of the stack-type piezoelectric ceramic are insulated, conductive layers are plated on the two sides of the stack-type piezoelectric ceramic, and second electrodes 9 are respectively arranged and used for being connected with an external driving circuit. Preferably, the layer thickness of the stacked piezoelectric ceramic is smaller than 0.05mm, and the layer number is larger than 20.
When the first driving module 4 is formed of one piezoelectric ceramic plate, the thickness of which is less than 0.3mm, it is possible to adapt to low-voltage driving.
The lens driving device a further comprises a guide rod 6, and one end of the guide rod 6 is fixedly connected with the third bracket 3. The second bracket 2 is provided with a guide hole 21, the diameter of the guide hole 21 being larger than the diameter of the guide bar 6. The other end of the guide rod 6 passes through the guide hole 21 to guide the first bracket 1, the second bracket 2 and the third bracket 3 to move relatively in the optical axis direction.
The first bracket 1 is provided with a hole 12 at a position corresponding to the guide hole 21, and the other end of the guide rod 6 is provided in the hole 12. Wherein the diameter of the hole 12 is larger than or equal to the diameter of the guide bar 6, so that the first bracket 1 can move along the guide bar 6. This allows the first and second brackets 1 and 2 to be moved in a direction defined by the guide bar 6 (i.e., in the optical axis direction) when they are moved relatively. The holes 12 may be through holes or blind holes.
In an alternative embodiment, the lens driving device a has two guide bars 6, each of which is disposed diagonally on the third support 3. When the second bracket 2 and the third bracket 3 relatively move, the first bracket 1 and the second bracket 2 can be reduced from shaking.
In another alternative implementation, the lens driving apparatus a has four guide bars 6 distributed at four corners of the third bracket 3. Correspondingly, four guide holes 21 and four holes 12 are respectively arranged on the second bracket 2 and the first bracket 1. After each guide rod 6 passes through the corresponding guide hole 21, the guide rods relatively move along the corresponding hole 12, so that the first bracket 1 and the second bracket 2 can move along the optical axis direction more stably relative to the third bracket 3, and shake generated during movement is further avoided.
In the present embodiment, the elastic member 51 may be made of a material having elasticity such as a spring, rubber, or the like. Preferably, the elastic member 51 is a spring, and is sleeved on the guide rod 6, so that when the second bracket 2 and the third bracket 3 relatively move, the direction of the elastic member 51 when expanding and contracting is parallel to the optical axis direction. Alternatively, when the elastic members 51 are springs, the number of the elastic members 51 is the same as the number of the guide bars 6.
The driving wire 52 has both ends connected to the third bracket 3 and a middle connected to the second bracket 2 such that both ends of the driving wire 52 form an isosceles triangle with the middle. When the drive wire 52 is controlled to be contracted and contracted, the second holder 2 can be controlled to be moved in the optical axis direction. Preferably, the lens driving apparatus a may further be provided with a pre-stressing adjustment screw 7 detachably connected with the second bracket 2. The middle part of the driving wire 52 bypasses the prestress adjusting screw 7 to be in hooking connection. The tip (i.e., the exposed portion) of the prestress adjusting screw 7 has a circular variable cross-section structure. When the lengths of the prestress adjusting screw 7 screwed into the second bracket 2 are different, the diameters of the exposed portions thereof are different, and the lengths of the driving wires 52 bypassing the prestress adjusting screw 7 are different, thereby achieving the purpose of adjusting the lengths of the driving wires 52 at the time of installation, as shown in fig. 4 and 5. In this embodiment, the drive wire 52 is formed of a material that can be controllably extended and retracted. Preferably, the drive wire 52 is a shape memory alloy wire. The displacement range of the shape memory alloy wire is about 400um, and the positioning accuracy is about 1um. In this embodiment, the shape memory alloy wire has a diameter of less than 50um.
The lens driving device a further includes two first electrodes 8 fixedly connected to the third frame 3, respectively. The two ends of the driving wire 52 are respectively electrically connected with the two first electrodes 8, and the driving wire is connected with an external driving circuit through the two first electrodes 8 to obtain driving signals so as to be controlled to stretch. The two first electrodes 8 are distributed on two sides of the third support 3, so that two ends of the driving wire 52 are connected with the first electrodes 8 to form an isosceles triangle structure. When the driving wire 52 receives the driving signal output from the first electrode 8, the telescopic lengths of the driving wires 52 on both sides of the prestress adjusting screw 7 are equal, so that the second bracket 2 and the third bracket 3 relatively move in the optical axis direction.
The second bracket 2 is further provided with a lead groove 22, and the lead groove 22 is disposed near the prestress adjusting screw 7, which may be formed in a groove shape for guiding the trend of the driving wire 52. When the drive wires 52 bypass the prestress adjustment screw 7, the drive wires 52 on both sides are located in the lead groove 22. When the drive wire 52 is controlled, the drive wire 52 expands and contracts along the lead groove 22.
In an alternative implementation, the third support 3 includes a first part 31 and a second part 32, which are connected one above the other to form a receiving space, and the first electrode 8 is disposed in the receiving space. Preferably, the first electrode 8 is a metal spring plate with elasticity, one end of the metal spring plate is fixedly connected with the first component 31, and the other end of the metal spring plate is in contact fit with the second component 32 through prestress. When the controlled extension and retraction of the drive wire 52 reaches a limit, the first electrode 8 begins to deform and displace relative to the second member 32. Due to the deformation of the first electrode 8, an additional structural buffer is provided for the drive line 52, avoiding breakage of the drive line 52 beyond a safe operating limit.
In another alternative implementation, the arrangement of the driving wires 52 is opposite to that described above, i.e. the driving wires 52 may be connected at both ends to the second bracket 2 and at the middle to the third bracket 3, as shown in fig. 6. The prestressing force adjustment screw 7 may be detachably connected with the third bracket 3. Two first electrodes 8 are distributed on both sides of the second support 2. Both ends of the driving wire 52 are electrically connected to the first electrode 8, respectively, and the middle part bypasses the prestress adjusting screw 7. When the drive wire 52 is controlled to expand and contract, the second and third brackets 2 and 3 relatively move in the optical axis direction. Optionally, a wire slot may be further disposed on the third bracket 3, and disposed at a position corresponding to the prestress adjusting screw 7, for guiding the driving wire 52. Alternatively, the second support 2 may be configured in the same manner as the third support 3, and the second support 2 includes a third component and a fourth component, which enclose a receiving space for receiving the first electrode 8. Two first electrodes 8 are correspondingly arranged on the second support 2, as shown in fig. 6.
In this embodiment, by setting piezoelectric ceramics between the first bracket 1 and the second bracket 2 and setting shape memory alloy wires between the second bracket 2 and the third bracket 3, the lens driving device can realize precision adjustment of a larger displacement range by using the shape memory alloy wires on one hand, and can realize fine adjustment of a smaller distance by using the piezoelectric ceramics on the other hand, thereby achieving the effect of high-precision positioning.
The second bracket 2 and the third bracket 3 are respectively provided with guide grooves 23 and 33 at the corresponding positions. The two second electrodes 9 are led out along the corresponding guide grooves 23 and 33 respectively and are connected with an external driving circuit, so that the second electrodes 9 can be prevented from being scratched by other equipment when being installed in the other equipment, and the installation accuracy can be improved.
In an alternative implementation, the lens driving apparatus a may have two first driving modules 4 and two driving wires 52. The two first driving modules 4 are distributed on two opposite sides of the first bracket 1 and the second bracket 2, each first driving module 4 is correspondingly provided with two second electrodes 9, and the two first driving modules are connected with corresponding driving circuits to acquire driving signals, so that the distance between the first bracket 1 and the second bracket 2 can be finely adjusted along the optical axis direction. Two driving wires 52 are distributed on two opposite sides of the second support 2 and the third support 3, each driving wire 52 is correspondingly provided with two first electrodes 8, and the two driving wires are connected with corresponding driving circuits to acquire driving signals, so that the distance between the second support 2 and the third support 3 can be roughly adjusted along the optical axis direction. In the present embodiment, by simultaneously controlling the first driving module 4 and the driving line 52 to operate in combination, thereby changing the focal length of the optical lens group, optical zooming or anti-shake is achieved.
In another alternative implementation, the lens driving apparatus a may have four first driving modules 4 and two driving wires 52. Four first driving modules 4 are distributed on four sides of the first bracket 1 and the second bracket 2, and each first driving module 4 is controlled by an independent driving circuit. Four drive lines 52 are distributed on opposite four sides of the second and third brackets 2, 3, each drive line 52 being controlled by an independent drive circuit.
In another embodiment, the embodiment of the invention further provides an image capturing module, which comprises a lens housing B, an optical lens group C, a photosensitive element D and a lens driving device a, as shown in fig. 7. The lens driving device a is disposed in the lens housing B, similar to the lens driving device a in the above embodiment. The optical lens group C is disposed in the first holder 1 of the lens driving apparatus a, as shown in fig. 7. The photosensitive element D is disposed in the lens housing B and opposite to the optical lens group C. The third bracket 3 is provided with a through hole in the middle, so that the photosensitive element D can capture an image signal transmitted through the optical lens group, and the lens driving device a can be controlled to perform coarse adjustment and/or fine adjustment on the focal length of the optical lens group C. The photosensitive element D may be a charge coupled device or a complementary metal oxide semiconductor chip.
The lens driving device A and the camera module can be applied to any electronic equipment with a camera function. Such as cell phones, tablet computers, notebook computers, unmanned aerial vehicles, car camera systems, etc.
The embodiment of the invention discloses a lens driving device and an image pickup module, wherein a first driving module is connected with a first bracket and a second bracket, a gap is formed between the first bracket and the second bracket, a driving wire is connected with a third bracket and the second bracket, and an elastic piece is arranged between the third bracket and the second bracket. And the first driving module and/or the second driving module are/is controlled to stretch and retract by applying driving signals to the first driving module and/or the second driving module so as to drive the first bracket and the second bracket to relatively move along the optical axis direction and/or control the distance between the third bracket and the second bracket. Therefore, coarse adjustment of displacement between the brackets can be realized, accurate adjustment of displacement can be realized, the adjustment precision of displacement between the brackets is improved, and the focusing precision of the optical lens is further improved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A lens driving apparatus, characterized in that the lens driving apparatus comprises:
A first bracket for fixing the optical lens group;
a second bracket and a third bracket, the second bracket being located between the first bracket and the third bracket;
at least one first driving module connecting the first and second brackets and forming a gap therebetween, the first driving module being configured to be controlled to be telescopic to drive the first and second brackets to relatively move in an optical axis direction; and
The second driving module is configured to be controlled to stretch and retract to drive the first bracket and the second bracket to be integrated and the third bracket to relatively move along the optical axis direction, and comprises an elastic piece arranged between the third bracket and the second bracket and a driving line connected with the third bracket and the second bracket, and the driving line is controlled to stretch and retract to control the distance between the third bracket and the second bracket;
The first driving module is a piezoelectric ceramic sheet or a stacked piezoelectric ceramic, the driving wire is a shape memory alloy wire, and the displacement precision of the first driving module for driving the first bracket and the second bracket to move in a controlled telescopic manner is different from the displacement precision of the driving wire for driving the first bracket and the second bracket to move in a controlled telescopic manner in a whole manner and the third bracket to move in a controlled telescopic manner;
The two ends of the driving wire are fixed on one of the second bracket and the third bracket, and the middle part of the driving wire is fixed on the other of the second bracket and the third bracket.
2. The lens driving apparatus according to claim 1, further comprising:
One end of the at least two guide rods is fixedly connected with the third bracket;
The second support is provided with at least two guide holes, and the guide rods penetrate through the corresponding guide holes to guide the second support and the third support to move relatively along the optical axis direction.
3. The lens driving apparatus according to claim 2, wherein the first bracket is provided with a hole at a position opposite to the guide hole, and the hole of the first bracket is relatively movably fitted over the guide rod.
4. The lens driving apparatus of claim 2, wherein the elastic member is a spring, and is sleeved on the guide rod.
5. The lens driving apparatus according to claim 1, further comprising:
And the driving wire bypasses the prestress adjusting screw to be connected with the second bracket.
6. The lens driving apparatus of claim 5, wherein the prestress adjustment screw has a circular variable cross-section structure at its end.
7. The lens driving apparatus according to claim 1, wherein the second holder is provided with a wire guide groove that guides the driving wire.
8. The lens driving apparatus according to claim 1, further comprising:
and the two ends of the driving wire are respectively and electrically connected with the corresponding first electrodes and are used for receiving driving signals to stretch and retract.
9. The lens driving apparatus according to claim 8, wherein the first electrode has elasticity;
The third support comprises a first component and a second component which are enclosed to form a containing space for containing the first electrode.
10. The lens driving apparatus according to claim 8, wherein the first electrode has elasticity;
The second bracket comprises a third component and a fourth component, and the third component and the fourth component enclose a containing space for containing the first electrode.
11. The lens driving apparatus according to claim 1, wherein the second and third brackets have guide grooves;
The lens driving apparatus further includes:
At least two second electrodes electrically connected to the first driving module through the guide grooves.
12. The utility model provides a module of making a video recording, its characterized in that, the module of making a video recording includes:
A lens housing;
the lens driving apparatus according to any one of claims 1 to 11, provided inside the lens housing;
an optical lens group arranged in the lens driving device;
And the photosensitive element is arranged opposite to the optical lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811070509.8A CN109061829B (en) | 2018-09-13 | 2018-09-13 | Lens driving device and camera module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811070509.8A CN109061829B (en) | 2018-09-13 | 2018-09-13 | Lens driving device and camera module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109061829A CN109061829A (en) | 2018-12-21 |
| CN109061829B true CN109061829B (en) | 2024-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811070509.8A Active CN109061829B (en) | 2018-09-13 | 2018-09-13 | Lens driving device and camera module |
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| WO2020243859A1 (en) * | 2019-06-01 | 2020-12-10 | 瑞声光学解决方案私人有限公司 | Automatic focusing lens assembly and automatic focusing method thereof |
| JP7015932B2 (en) * | 2019-06-01 | 2022-02-03 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | Prism device and periscope lens module applied to periscope lens module |
| WO2021000161A1 (en) * | 2019-06-30 | 2021-01-07 | 瑞声光学解决方案私人有限公司 | Lens module |
| CN110727122A (en) * | 2019-09-11 | 2020-01-24 | 瑞声科技(新加坡)有限公司 | Optical anti-shake component |
| CN110750023A (en) * | 2019-09-11 | 2020-02-04 | 瑞声科技(新加坡)有限公司 | Lens module and electronic equipment |
| CN110913099B (en) * | 2019-10-28 | 2021-09-07 | 华为技术有限公司 | Camera module and terminal |
| CN114222052A (en) * | 2019-11-12 | 2022-03-22 | 广东海德亚科技有限公司 | Actuator and driving device for camera adjustment |
| CN112887519B (en) * | 2019-11-29 | 2022-09-23 | 华为技术有限公司 | Camera module and electronic equipment |
| CN111158105A (en) * | 2020-02-10 | 2020-05-15 | 睿恩光电有限责任公司 | SMA wire lens drive device for auto-focusing, camera device, and electronic apparatus |
| CN114666461B (en) * | 2020-12-22 | 2023-08-29 | 宁波舜宇光电信息有限公司 | Telescopic camera module and electronic equipment |
| CN112672018B (en) * | 2020-12-24 | 2022-09-02 | 维沃移动通信有限公司 | Electronic equipment and camera module thereof |
| CN112672019B (en) * | 2020-12-24 | 2022-10-25 | 维沃移动通信有限公司 | Electronic equipment and camera module thereof |
| CN113114907B (en) * | 2021-04-21 | 2023-01-24 | 维沃移动通信有限公司 | Camera module and electronic equipment |
| CN113325544B (en) * | 2021-06-07 | 2022-06-03 | 上海比路电子股份有限公司 | Continuous zooming optical lens driving device |
| CN113448139A (en) * | 2021-07-02 | 2021-09-28 | 中山联合光电研究院有限公司 | Telescopic zoom lens |
| CN113467157A (en) * | 2021-07-02 | 2021-10-01 | 中山联合光电研究院有限公司 | Telescopic zoom lens |
| CN113568131B (en) * | 2021-07-29 | 2022-05-13 | 上海信迈电子科技有限公司 | Lens driving device, camera device and mobile terminal |
| CN118068510A (en) * | 2021-12-07 | 2024-05-24 | 新思考电机有限公司 | Lens driving device and image pickup device |
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