CN115079486B - Camera module and electronic equipment - Google Patents
Camera module and electronic equipment Download PDFInfo
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- CN115079486B CN115079486B CN202210737761.XA CN202210737761A CN115079486B CN 115079486 B CN115079486 B CN 115079486B CN 202210737761 A CN202210737761 A CN 202210737761A CN 115079486 B CN115079486 B CN 115079486B
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- lens group
- camera module
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- carrier
- optical axis
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
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- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910002113 barium titanate Inorganic materials 0.000 description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
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- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
-
- 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
- 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
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/0017—Casings, cabinets or drawers for electric apparatus with operator interface units
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The application provides a camera module and electronic equipment. The camera module comprises a bracket with an accommodating space. The first lens group, the second lens group and the third lens group are sequentially arranged from the object side to the image side along the optical axis, the first lens group and the third lens group are assembled on the bracket, and the second lens group and the third lens group are arranged in the accommodating space. The piezoelectric structure is arranged on the bracket and connected with the second lens group, and the piezoelectric structure is used for driving the second lens group to move along the direction of the optical axis. According to the application, the piezoelectric structure is utilized to drive the second lens group to move, so that the total height of the camera module is not changed on the basis of realizing the focusing function of the camera module, and further the size of the opening is not required to be increased and kept as is, and the appearance performance of the whole camera module is not influenced.
Description
Technical Field
The application belongs to the technical field of camera modules, and particularly relates to a camera module and electronic equipment.
Background
With the increasing market shooting demands, front-end automatic focusing is a certain development trend because more scene shooting can be satisfied. The lens in the current camera module moves up and down as a whole, which can lead to the increase of the size of the front opening.
Disclosure of Invention
In view of this, a first aspect of the present application provides a camera module, including:
the bracket is provided with an accommodating space;
The first lens group, the second lens group and the third lens group are sequentially arranged from the object side to the image side along the optical axis, the first lens group and the third lens group are assembled and arranged in the bracket, and the second lens group and the third lens group are arranged in the accommodating space; and
The piezoelectric structure is arranged on the bracket and connected with the second lens group, and the piezoelectric structure is used for driving the second lens group to move along the direction of the optical axis.
According to the camera module provided by the first aspect of the application, the first lens group and the third lens group are assembled and arranged on the bracket, so that the first lens group and the third lens group are fixed, and the second lens group is connected with the piezoelectric structure. The piezoelectric structure can drive the second lens group to move along the direction of the optical axis, so that the distance between the second lens group and the first lens group and the distance between the second lens group and the third lens group are changed, and the focusing function of the camera module is realized. In other words, the uppermost lens set and the lowermost lens set in the camera module of the present application are stationary, and the middle lens set can move. Therefore, the whole camera module is kept stationary while the second lens group moves, so the total height of the camera module cannot change, the size of the opening is not required to be increased and kept as is, and the appearance performance of the whole camera module cannot be affected.
In addition, compared with the scheme adopting electromagnetic driving in the related art, the piezoelectric driving method does not bring the problems of electromagnetic interference and the like by adopting piezoelectric driving, and the piezoelectric driving precision is higher, and components such as a sensor and the like are not required to be added.
The second aspect of the application provides an electronic device, which comprises a display screen, a shell, a processor and the camera module provided by the first aspect of the application, wherein the display screen is arranged on the shell and surrounds the shell to form an accommodating space, the camera module and the processor are arranged in the accommodating space, the camera module is electrically connected with the processor, and the object side of the camera module is close to the display screen.
According to the electronic equipment provided by the second aspect of the application, by adopting the camera module provided by the first aspect of the application, the size of the opening of the display screen can be not increased, and the appearance performance of the electronic equipment can not be influenced. And electromagnetic interference is not generated, and components such as a sensor and the like are not required to be added.
Drawings
In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings that are used in the embodiments of the present application will be described below.
Fig. 1 is a schematic perspective view of a camera module according to an embodiment of the application.
Fig. 2 is an exploded view of the camera module shown in fig. 1.
Fig. 3 is a schematic cross-sectional view of the camera module shown in fig. 1.
Fig. 4 is a schematic cross-sectional view of the camera module shown in fig. 1 in another direction.
Fig. 5 is a schematic diagram illustrating the cooperation of the carrier, the second lens set, the piezoelectric structure, and the connecting member according to an embodiment of the application.
Fig. 6 is an exploded view of the carrier, second lens set, piezoelectric structure, and connector shown in fig. 5.
Fig. 7 is an exploded view of a piezoelectric structure and a carrier according to an embodiment of the application.
Fig. 8 is a schematic view of the piezoelectric structure in the L1 vibration mode.
Fig. 9 is a schematic diagram of the piezoelectric structure in the B2 vibration mode.
Fig. 10 is a graph of vibration of a piezoelectric structure at different voltages.
Fig. 11 is a schematic cross-sectional view of a camera module according to another embodiment of the application.
Fig. 12 is a schematic partial cross-sectional view of the camera module shown in fig. 11.
Fig. 13 is a schematic cross-sectional view of a camera module according to another embodiment of the application.
Fig. 14 is a schematic cross-sectional view of a camera module according to another embodiment of the application.
Fig. 15 is a schematic perspective view of a carrier according to an embodiment of the application.
Fig. 16 is a schematic cross-sectional view of a camera module according to another embodiment of the application.
Fig. 17 is a schematic partial cross-sectional view of an electronic device according to an embodiment of the application.
Description of the reference numerals:
The camera module comprises a camera module body-1, electronic equipment-2, a support body-10, a first sub-support body-101, a second sub-support body-102, an accommodating space-11, an optical axis-O, a through hole-12, a protruding part-13, a first lens group-21, a second lens group-22, a third lens group-23, a piezoelectric structure-30, a piezoelectric element-31, a first friction element-32, an annular protection element-40, a bearing element-50, an accommodating space-51, a connecting element-52, a sliding groove-53, a second friction element-60, an elastic element-70, a through hole-71, a guide component-80, a guide ball-81, a guide rod-90, a filter element-100, a photoelectric conversion element-110, a circuit board-120, an electric connector-130, a display screen-140, a shell-150, an accommodating space-151 and a processor-160.
Detailed Description
The following are preferred embodiments of the present application, and it should be noted that modifications and variations can be made by those skilled in the art without departing from the principle of the present application, and these modifications and variations are also considered as the protection scope of the present application.
Before the technical scheme of the application is described, the technical problems in the related art are described in detail.
With the development of portable electronic devices such as smart phones and tablet computers and intelligent wearable devices, the demands of users on the image quality of terminal devices are increasing. At present, a front-end camera of a mobile phone is fixed focus (Fix foucus, FF) mainly, however, along with the requirement of video shooting in the market, automatic focusing (Autofocus, AF) becomes an important direction for improving user experience, and the front-end automatic focusing is a necessary trend because the front-end automatic focusing can meet more scene shooting.
In the related art, a common scheme of front-mounted auto-focusing is to move a rear-mounted camera module structure to the front, and to implement auto-focusing by adding a Voice Coil Motor (VCM), the lens assembly moves up and down in a height direction along with a focusing distance change. However, the whole lens moves up and down, so that the total height of the module is changed, the gap between the lens and the touch screen glass needs to be enlarged, and the gap is enlarged to directly increase the opening, so that the appearance performance of the whole lens is affected.
In view of the above, the present application provides a camera module to solve the above problems. Referring to fig. 1-4 together, fig. 1 is a schematic perspective view of a camera module according to an embodiment of the application. Fig. 2 is an exploded view of the camera module shown in fig. 1. Fig. 3 is a schematic cross-sectional view of the camera module shown in fig. 1. Fig. 4 is a schematic cross-sectional view of the camera module shown in fig. 1 in another direction.
The present embodiment provides a camera module 1, which includes a bracket 10 having a receiving space 11. The first lens group 21, the second lens group 22 and the third lens group 23 are sequentially arranged from the object side to the image side along the optical axis O, the first lens group 21 and the third lens group 23 are assembled on the bracket 10, and the second lens group 22 and the third lens group 23 are disposed in the accommodating space 11. The piezoelectric structure 30 is mounted on the bracket 10 and connected to the second lens group 22, and the piezoelectric structure 30 is used for driving the second lens group 22 to move along the direction of the optical axis O (as shown in the direction D in fig. 3-4).
The camera module 1 provided in this embodiment is a zoom type camera module 1, that is, the focal length of the camera module 1 can be changed. The camera module 1 can be applied to various fields and devices requiring zooming, and this embodiment is not limited thereto.
The support 10 mainly supports, installs, protects the structure of etc. function, other structures of camera module 1 can install on support 10 to support 10 still has accommodation space 11, can effectively protect the structure that is located in accommodation space 11. Alternatively, the stand 10 may be a one-piece structure or a split-piece structure. The present embodiment is only schematically illustrated with the bracket 10 as a split structure, that is, the bracket 10 of the present embodiment may be divided into two parts, namely, a first sub-bracket 101 and a second sub-bracket 102, where the first sub-bracket 101 is mounted on the second sub-bracket 102.
The camera module 1 of the present embodiment mainly includes a first lens group 21, a second lens group 22, and a third lens group 23 sequentially arranged from an object side to an image side along an optical axis O, i.e. the first lens group 21 is closer to the object side of the camera module 1, the third lens group 23 is closer to the image side of the camera module 1, and light enters the camera module 1 and sequentially passes through the first lens group 21, the second lens group 22, and the third lens group 23. In this case, the first lens group 21 may be referred to as an upper lens group, the second lens group 22 may be referred to as an inner lens group, and the third lens group 23 may be referred to as a lower lens group. It will be appreciated that the camera module 1 comprises three lens groups, each comprising at least one lens (LENS PLATE). It should be noted that the camera module 1 of the present embodiment may include more lens groups, such as a fourth lens Group, a fifth lens Group, and so on, instead of only three lens groups (LENS PLATE groups).
In the case where the first lens group 21 and the third lens group 23 are mounted on the bracket 10, although the camera module 1 of the present embodiment is the zoom camera module 1, the bracket 10 itself does not move, so that the first lens group 21 and the third lens group 23 mounted on the bracket 10 do not move, so that the first lens group 21 and the third lens group 23 are fixed, and the first lens group 21 and the third lens group 23 are relatively stable. Optionally, the first lens group 21 is mounted on the first sub-mount 101, and the third lens group 23 is mounted on the second sub-mount 102. The second lens group 22 and the third lens group 23 are disposed in the accommodating space 11, and the bracket 10 can effectively protect the second lens group 22 and the third lens group 23. As for the first lens group 21, it may be disposed in the accommodating space 11 or may be disposed outside the accommodating space 11, and this embodiment will be schematically described only with the first lens group 21 disposed outside the accommodating space 11. Optionally, when the first lens group 21 is disposed outside the accommodating space 11, the camera module 1 further includes an annular protection member 40, the annular protection member 40 is disposed on the outer peripheral side of the first lens group 21 to protect the first lens group 21, and the annular protection member 40 and the first lens group 21 are both mounted on the first sub-bracket 101.
The piezoelectric structure 30 is a structural member capable of changing parameters such as shape and size of the piezoelectric structure 30 under control of voltage. The piezoelectric structure 30 is mounted on the support 10, and the piezoelectric structure 30 is connected to the second lens group 22, so that when the piezoelectric structure 30 is in operation, due to the change of its shape, size and other parameters, the second lens group 22 can be driven to move, and the second lens group 22 can be moved along the direction of the optical axis O, so that the second lens group 22 can be moved along the direction approaching the first lens group 21, and the second lens group 22 can be moved along the direction approaching the third lens group 23. As shown in fig. 3-4, the second lens group 22 is also moved in a vertical direction by the piezoelectric structure 30.
When the second lens group 22 moves, the distance between the second lens group 22 and the first lens group 21, and the distance between the second lens group 22 and the third lens group 23 are changed, so as to realize the focusing function of the camera module 1. In other words, the uppermost lens group and the lowermost lens group in the camera module 1 of the present application are stationary, and the middle lens group can be moved. Therefore, the whole camera module 1 is kept stationary while the second lens group 22 moves, so the overall height of the camera module 1 is not changed, and the size of the opening is not increased and is kept as it is, and the appearance performance of the whole camera is not affected.
In addition, compared with the scheme adopting electromagnetic driving in the related art, the piezoelectric driving method does not bring the problems of electromagnetic interference and the like by adopting piezoelectric driving, and the piezoelectric driving precision is higher, and components such as a sensor and the like are not required to be added.
In summary, the camera module 1 provided in this embodiment can keep the situation of not increasing the front opening, and has the advantages of fast response, no magnetic interference, and the like. The piezoelectric driving force is larger, namely the force is large, and the piezoelectric lens can be suitable for larger modules and is an ideal scheme for front zooming. Because the piezoelectric structure 30 has nano-scale moving precision, the precision is high, an open loop can be formed, parts such as a Hall sensor are not needed, and the cost is low. And the piezoelectric structure 30 has a self-locking property and a low power consumption property.
Referring to fig. 1, fig. 3-fig. 6 again, fig. 5 is a schematic diagram illustrating the cooperation of the carrier, the second lens set, the piezoelectric structure, and the connecting member according to an embodiment of the application. Fig. 6 is an exploded view of the carrier, second lens set, piezoelectric structure, and connector shown in fig. 5. In this embodiment, the camera module 1 further includes a carrier 50 disposed in the accommodating space 11, the carrier 50 is configured to carry the second lens group 22, the carrier 50 has an accommodating space 51, and at least a portion of the third lens group 23 is located in the accommodating space 51; the piezoelectric structure 30 is connected to the carrier 50, and the piezoelectric structure 30 can drive the carrier 50 to move along the direction of the optical axis O.
The bearing member 50 can be disposed in the accommodating space 11 and is used for bearing the second lens group 22, so that the second lens group 22 can be disposed on the bearing member 50, and the piezoelectric structure 30 is connected with the bearing member 50, so that the bearing member 50 is driven to move along the direction of the optical axis O during operation of the piezoelectric structure 30, and further the second lens group 22 is driven to move along the direction of the optical axis O, thereby improving the stability of the movement of the second lens group 22 and reducing the difficulty of connecting the second lens group 22 with the piezoelectric structure 30. The carrier 50 further has a receiving space 51, at least a portion of the third lens group 23 is located in the receiving space 51, and the third lens group 23 is received by the receiving space 51 of the carrier 50 to make the structure of the camera module 1 more compact.
It is noted that the connection and the installation mentioned below in this embodiment may be a direct connection and a direct installation, or an indirect connection and an indirect installation. In this embodiment, the carrier 50 is only schematically illustrated by indirectly mounting the second lens group 22 through other components, and the piezoelectric structure 30 is indirectly connected to the carrier 50. Optionally, the camera module 1 further includes a connecting member 52, and the connecting member 52 connects the carrier 50 and the second lens group 22.
Referring to fig. 3 and fig. 7 together, fig. 7 is an exploded view of a piezoelectric structure and a carrier according to an embodiment of the application. In this embodiment, the piezoelectric structure 30 includes a piezoelectric element 31 and a first friction element 32 that are connected, the piezoelectric element 31 is mounted on the support 10, the first friction element 32 is connected to the carrier 50, the piezoelectric element 31 is configured to generate vibration under the control of the processor 160, and at least part of the direction of the vibration is along the direction of the optical axis O.
The piezoelectric structure 30 may include a piezoelectric element 31 and a first friction element 32, wherein the piezoelectric element 31 is made of a piezoelectric material, including but not limited to piezoelectric ceramics or piezoelectric single crystals, and may also be a multilayer ceramic. The present embodiment is schematically illustrated in two layers, in which case the piezoelectric structure 30 may be referred to as a stacked piezoelectric actuator. Specifically, the piezoelectric material may be selected from lead zirconate titanate (Lead Zirconate Titanate, PZT) based piezoelectric ceramic, potassium sodium niobate (Potassium-Sodium Niobate, KNN) based piezoelectric ceramic, barium titanate (Barium Titanate, BT) based piezoelectric ceramic, lead magnesium niobate-lead indium niobate (Lead Niobate-Lead Niobate Indium, PMN-PT) based piezoelectric single crystal, textured ceramic, or the like.
The piezoelectric element 31 uses the inverse piezoelectric effect of the piezoelectric material, and after an ac electric signal with a certain frequency is applied to the piezoelectric element 31, the piezoelectric element 31 simultaneously excites a plurality of modes, and micro-amplitude vibration and driving force are generated by means of multi-mode coupling. Optionally, the mode coupling includes an L1B2 mode of operation in which a first-order elongation (L1) vibration mode and a second-order bending vibration mode (B2) are coupled, a B1 mode of operation in which two orthogonal directions of first-order bending (B1) are coupled, and the like.
The first friction member 32 may be understood as a friction head of the piezoelectric structure 30, and the material of the friction head may be alumina (Al 2O3), silica (SiO 2), zirconia (ZrO 2), carbon fiber, polyester fiber, or other wear-resistant materials, so that the driving force of the piezoelectric member 31 can be well transmitted to the first friction member 32, and meanwhile, abrasion under long-time working can be prevented, and the matching precision is maintained. The shape of the first friction member 32 may be cylindrical, spherical, triangular cone, or some other irregularly shaped design. When the piezoelectric element 31 generates micro-amplitude vibration by means of multi-mode coupling, the friction element can be driven to vibrate slightly, and the first friction element 32 is connected with the bearing element 50, so that vibration can be transmitted to the bearing element 50, at least part of the vibration direction is along the optical axis O, and the bearing element 50 and the second lens group 22 move along the optical axis O. The present embodiment can better transmit vibration to the carrier 50 using the high friction coefficient of the first friction member 32.
Referring to fig. 8-10, fig. 8 is a schematic diagram of the piezoelectric structure in the L1 vibration mode. Fig. 9 is a schematic diagram of the piezoelectric structure in the B2 vibration mode. Fig. 10 is a graph of vibration of a piezoelectric structure at different voltages. The piezoelectric structure 30 uses lead indium niobate-lead magnesium niobate-lead titanate relaxor ferroelectric single crystal (PIN-PMN-PT single crystal) material, and generates displacement components in X direction and Y direction on the first friction member 32 under the drive of two sets of driving electrodes by coupling of L1-B2 modes at resonance frequency, and the resultant displacement is an upward or downward oblique ellipse due to the phase difference of voltages on the two sets of driving electrodes, and then pushes the carrier 50 and the second lens group 22 to generate macroscopic displacement by the interaction of the first friction member 32 and the carrier 50.
In this embodiment, only the coupling between the L1 mode and the B2 mode is schematically described, but in other embodiments, at least two modes may be used to couple the piezoelectric element 31, so that 2 or more modes may be excited at the same frequency, and the elliptical motion of the first friction element 32 may be excited by the multi-mode coupling, and finally converted into the vertical linear motion of the carrier 50 and the second lens group 22.
Referring to fig. 3 and 6 again, in the present embodiment, the camera module 1 further includes a second friction member 60, the second friction member 60 is mounted on the carrier 50, and the second friction member 60 is connected to the first friction member 32.
The second friction member 60 may be disposed on the outer circumferential side of the carrier 50 and disposed corresponding to the first friction member 32, such that the second friction member 60 is connected to the first friction member, i.e., the first friction member 32 is indirectly connected to the carrier 50 through the second friction member 60. The second friction member 60 is made of a wear-resistant material, and specifically, the material selection can be the same as that of the first friction member 32, that is, the material of the second friction member 60 can be alumina (Al 2O3), silica (SiO 2), zirconia (ZrO 2), carbon fiber, polyester fiber, or other wear-resistant materials. The first friction piece 32 and the second friction piece 60 are contacted with each other to form point contact, line contact or surface contact, the connecting effect of the first friction piece 32 and the second friction piece 60 is further improved by utilizing the high friction coefficient of the second friction piece 60, so that vibration generated by the piezoelectric piece 31 and the first friction piece 32 can be better transmitted to the bearing piece 50 through the mutual matching of the first friction piece 32 and the second friction piece 60, and the second lens group 22 is driven to perform up-down focusing movement, and the front focusing function is completed.
Referring to fig. 1, 11-12, fig. 11 is a schematic cross-sectional view of a camera module according to another embodiment of the application. Fig. 12 is a schematic partial cross-sectional view of the camera module shown in fig. 11. In this embodiment, the camera module 1 further includes an elastic member 70, the elastic member 70 is mounted on the bracket 10, and the piezoelectric member 31 is connected to a side of the elastic member 70 near the carrier 50.
The elastic member 70 is a structural member having a certain elasticity, the elastic member 70 is mounted on the bracket 10, and the piezoelectric member 31 is connected to the elastic member 70, so that the piezoelectric member 31 is indirectly connected to the bracket 10 through the elastic member 70. Alternatively, the elastic member 70 is connected to the support frame 10 by adhesion, and the elastic member 70 is connected to the piezoelectric member 31 by adhesion. And the piezoelectric element 31 is connected to a side of the elastic element 70 close to the carrier 50, i.e. the elastic element 70 is connected to a side of the piezoelectric element 31 facing away from the carrier 50. From the above, it is known that the piezoelectric element 31 generates vibration under the control of the voltage, and since the vibration has multi-directionality, vibration may be performed not only in the vertical direction but also in the horizontal direction. When vibration is generated in the horizontal direction, the piezoelectric member 31 transmits the vibration to the elastic member 70. The first friction member 32 can be brought into close abutment with the second friction member 60 when the piezoelectric member 31 vibrates in a direction approaching the carrier 50. When the piezoelectric element 31 vibrates in a direction away from the carrier 50, the piezoelectric element 31 drives the elastic element 70 to move in a direction away from the carrier 50, so that the first friction element 32 is separated from the second friction element 60. However, since the elastic member 70 is located on the side of the piezoelectric member 31 away from the carrier 50, even if the first friction member 32 is separated from the second friction member 60, the elastic member 70 can use its rebound force to make the first friction member 32 abut against the second friction member 60 again.
In summary, the first friction member 32 and the second friction member 60 are kept in close contact or separated temporarily by the elastic member 70 in the present embodiment, so as to ensure that the vibration generated by the piezoelectric structure 30 can be effectively transmitted to the carrier 50.
Alternatively, a via hole 12 communicating with the accommodating space 11 may be formed on the outer peripheral side of the bracket 10, a protruding portion 13 is disposed on a side wall of the via hole 12, the elastic member 70 is disposed on a side of the protruding portion 13 away from the carrier 50, and the piezoelectric member 31 is connected to a side of the elastic member 70 close to the carrier 50.
Referring to fig. 12 again, in the present embodiment, the elastic member 70 has a through hole 71 exposing the piezoelectric member 31, and the through hole 71 is used to pass a wire (not shown) electrically connected to the processor (not shown) through the elastic member 70 and electrically connect the piezoelectric member 31. In this embodiment, the through hole 71 may be formed in the elastic member 70 and expose the piezoelectric member 31, so that the wire may conveniently pass through the elastic member 70 to be electrically connected to the piezoelectric member 31, so as to electrically connect the piezoelectric member 31 to the processor 160. Alternatively, the side surface of the piezo element 31 facing away from the carrier element 50 has at least one electrode for applying different control signals.
Referring to fig. 11 and fig. 13 together, fig. 13 is a schematic cross-sectional view of a camera module according to another embodiment of the application. In this embodiment, the camera module 1 further includes at least one set of guide assemblies 80, each set of guide assemblies 80 includes at least one guide ball 81 aligned along the optical axis O, the guide ball 81 abuts against the support 10 and the carrier 50, and the piezoelectric structure 30, the carrier 50, the guide ball 81, and the support 10 cooperate with each other to move the second lens group 22 along the direction of the optical axis O.
Two embodiments are described for cooperating with the piezoelectric structure 30 to effect movement of the second lens group 22 in the direction of the optical axis O. In the first embodiment, a guide assembly 80 may be added, where the guide assembly 80 includes at least one guide ball 81 aligned along the optical axis O, and the guide ball 81 abuts the bracket 10 and the carrier 50. Therefore, when the piezoelectric structure 30 vibrates, the carrier 50 is driven to vibrate, and the carrier 50 cannot move along the direction perpendicular to the optical axis O by virtue of the guiding function of the guiding balls 81, but only moves along the direction of the optical axis O, so that the second lens group 22 finally moves along the direction of the optical axis O. In this embodiment, only the camera module 1 includes two sets of guide assemblies 80, and each set of guide assemblies 80 includes three guide balls 81.
Referring to fig. 11 and fig. 14 together, fig. 14 is a schematic cross-sectional view of a camera module according to another embodiment of the application. In this embodiment, the camera module 1 further includes at least one guide rod 90, each guide rod 90 is slidably connected to the carrier 50, and the piezoelectric structure 30, the carrier 50, and the guide rod 90 cooperate with each other to move the second lens group 22 along the direction of the optical axis O.
In the second embodiment, instead of the guide assembly 80, the guide rod 90 is slidably connected to the carrier 50, and the extending direction of the guide rod 90 is the direction of the optical axis O, when the piezoelectric structure 30 vibrates, the carrier 50 is driven to vibrate, and the carrier 50 is slidably connected to the guide rod 90, so that the carrier 50 can extend the extending direction of the guide rod 90 to slide, that is, move along the direction of the optical axis O, and finally move the second lens group 22 along the direction of the optical axis O. Optionally, the guide rod 90 is located in the accommodating space 11 and is mounted on the bracket 10. The present embodiment is schematically illustrated with only two guide bars 90.
Referring to fig. 15, fig. 15 is a schematic perspective view of a carrier according to an embodiment of the application. In this embodiment, a sliding groove 53 is provided on the outer peripheral side of the carrier 50, and at least a part of the guide assembly 80 or at least a part of the guide rod 90 is located in the sliding groove 53.
In the present embodiment, the sliding groove 53 may be provided on the outer peripheral side of the carrier 50 while at least part of the guide assembly 80 or at least part of the guide rod 90 is located in the sliding groove 53. This not only makes the structure of the camera module 1 more compact, but also realizes the guiding function by the side wall of the sliding groove 53 being matched with the guiding ball 81 or the guiding rod 90.
In the present application, the camera module 1 may further include a filter 100, a photoelectric conversion element 110, a circuit board 120, an electrical connector 130 (BTB), and the like, in addition to the above-described components. Referring to fig. 16, fig. 16 is a schematic cross-sectional view of a camera module according to another embodiment of the application. The filter 100 is disposed in the accommodating space 11 and mounted on the bracket 10, and the filter 100 is located at the image side of the third lens group 23. The photoelectric conversion element 110 is disposed in the accommodating space 11 and located at the image side of the filter 100. The circuit board 120 is located outside the accommodating space 11 and is mounted on one side of the bracket 10, and the photoelectric conversion element 110 is electrically connected to the circuit board 120. The electrical connector 130 is located outside the accommodating space 11 and is electrically connected to the circuit board 120.
In summary, the camera module 1 of the present application is fixed on the bracket 10 through the elastic member 70, the piezoelectric member 31 and the elastic member 70 are connected through the adhesive, the first friction member 32 is adhered to the piezoelectric member 31, the first friction member 32 contacts with the second friction member 60, the second friction member 60 is fixed on the carrier 50, after the piezoelectric member 31 is energized, the first friction member 32 is driven by deformation to perform the accumulation of micro-motion of the first friction member 32, and finally the second friction member 60 is driven by deformation to perform the relative motion, and the carrier 50 is driven by the second friction member 60 to perform the up-down motion, so as to finally push the second lens group 22 to perform the uppermost-down motion, thereby achieving focusing. The piezoelectric structure 30 is used as a driving piece, so that the application has small volume, high precision and no magnetic interference.
Referring to fig. 17, fig. 17 is a schematic partial cross-sectional view of an electronic device according to an embodiment of the application. The embodiment provides an electronic device 2, including a display screen 140, a housing 150, a processor 160, and a camera module 1 according to the first aspect of the present application, where the display screen 140 is installed in the housing 150 and encloses an accommodating space 151 with the housing 150, the camera module 1 and the processor 160 are disposed in the accommodating space 151, the camera module 1 is electrically connected to the processor 160, and the processor 160 is configured to receive shooting information sent by the camera module 1 and convert the shooting information into image information. The object side of the camera module 1 is close to the display screen 140.
The electronic device 2 provided in this embodiment includes, but is not limited to, mobile terminals such as a mobile phone, a tablet computer, a notebook computer, a palm computer, a Personal computer (Personal Computer, PC), a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a Portable media player (Portable MEDIA PLAYER, PMP), a navigation device, a wearable device, a smart bracelet, a pedometer, and a stationary terminal such as a digital TV, a desktop computer, and the like. The present embodiment is not limited in the type of the electronic device 2.
By adopting the camera module 1 provided by the embodiment of the present application, the electronic device 2 provided by the present embodiment can avoid increasing the size of the opening of the display screen 140 and does not affect the appearance performance of the electronic device 2. And electromagnetic interference is not generated, and components such as a sensor and the like are not required to be added.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application in order that the principles and embodiments of the application may be better understood, and in order that the present application may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. A camera module, comprising:
the bracket is provided with an accommodating space;
The first lens group, the second lens group and the third lens group are sequentially arranged from the object side to the image side along the optical axis, the first lens group and the third lens group are assembled and arranged in the bracket, and the second lens group and the third lens group are arranged in the accommodating space; and
The piezoelectric structure is arranged on the bracket and connected with the second lens group, and the piezoelectric structure is used for driving the second lens group to move along the direction of the optical axis;
The camera module further comprises a bearing piece arranged in the accommodating space, the bearing piece is used for bearing the second lens group, the bearing piece is provided with an accommodating space, and at least part of the third lens group is positioned in the accommodating space; the piezoelectric structure is arranged on the peripheral side surface of the bearing piece and connected with the bearing piece, and the piezoelectric structure can drive the bearing piece to move along the direction of the optical axis;
The piezoelectric structure comprises a piezoelectric element and a first friction element which are connected, the piezoelectric element is arranged on the bracket, the first friction element is connected with the bearing element, the piezoelectric element is used for generating vibration under the control of the processor, and at least part of the vibration direction is along the direction of the optical axis;
the camera module further comprises an elastic piece, the elastic piece is arranged on the support, the piezoelectric piece is connected to one side, close to the bearing piece, of the elastic piece, the elastic piece is used for enabling the first friction piece to be always kept in close contact with or be separated temporarily from the bearing piece, and therefore vibration generated by the piezoelectric structure can be effectively transmitted to the bearing piece.
2. The camera module of claim 1, further comprising a second friction member mounted to the carrier member, the second friction member coupled to the first friction member.
3. The camera module of claim 1, wherein the elastic member has a through hole exposing the piezoelectric member, the through hole being for passing a wire electrically connected to the processor through the elastic member and electrically connecting the piezoelectric member.
4. The camera module of claim 1, further comprising at least one set of guide assemblies, each set of guide assemblies comprising at least one guide ball aligned along the optical axis, the guide balls abutting the support and the carrier, the piezoelectric structure, the carrier, the guide balls, and the support cooperating to move the second lens set in the direction of the optical axis.
5. The camera module of claim 4, wherein the outer peripheral side of the carrier is provided with a sliding groove, and at least a portion of the guide assembly is located in the sliding groove.
6. The camera module of claim 1, further comprising at least one guide bar, each guide bar slidably coupled to the carrier, the piezoelectric structure, the carrier, and the guide bar cooperatively moving the second lens group in the direction of the optical axis.
7. The camera module of claim 6, wherein the outer peripheral side of the carrier is provided with a sliding groove, and at least a portion of the guide bar is located in the sliding groove.
8. An electronic device, comprising a display screen, a housing, a processor, and a camera module according to any one of claims 1-7, wherein the display screen is mounted on the housing and encloses with the housing to form an accommodating space, the camera module and the processor are disposed in the accommodating space, the camera module is electrically connected with the processor, and an object side of the camera module is close to the display screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210737761.XA CN115079486B (en) | 2022-06-25 | 2022-06-25 | Camera module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210737761.XA CN115079486B (en) | 2022-06-25 | 2022-06-25 | Camera module and electronic equipment |
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| CN118055176A (en) * | 2022-11-15 | 2024-05-17 | 华为技术有限公司 | Drive assembly and electronic device |
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| CN101556366A (en) * | 2008-04-09 | 2009-10-14 | 鸿富锦精密工业（深圳）有限公司 | Zoom lens driving device |
| CN105071691A (en) * | 2014-08-25 | 2015-11-18 | 新思考电机有限公司 | piezoelectric actuator, linear drive device and electronic device |
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| JP3141714B2 (en) * | 1994-11-21 | 2001-03-05 | ミノルタ株式会社 | Driving device using electromechanical transducer |
| KR20060077314A (en) * | 2004-12-30 | 2006-07-05 | 삼성전기주식회사 | Piezoelectric driving unit and lens driving apparatus having the same |
| CN201188142Y (en) * | 2007-12-07 | 2009-01-28 | 德昌电机(深圳)有限公司 | Optical system driven by piezo-electric motor for focusing |
| KR101001720B1 (en) * | 2009-06-16 | 2010-12-15 | 삼성전기주식회사 | Device for lens transfer |
| CN102455478B (en) * | 2010-10-27 | 2016-01-13 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing mechanism |
| TW201310110A (en) * | 2011-08-19 | 2013-03-01 | Hon Hai Prec Ind Co Ltd | Actuator and camera module using same |
| JP5966383B2 (en) * | 2012-01-26 | 2016-08-10 | Tdk株式会社 | Lens drive device |
| CN212935798U (en) * | 2020-09-24 | 2021-04-09 | 辽宁中蓝光电科技有限公司 | Piezoelectric linear driver for driving camera lens |
| CN215340502U (en) * | 2021-08-04 | 2021-12-28 | 河南皓泽电子股份有限公司 | Lens driving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556366A (en) * | 2008-04-09 | 2009-10-14 | 鸿富锦精密工业（深圳）有限公司 | Zoom lens driving device |
| CN105071691A (en) * | 2014-08-25 | 2015-11-18 | 新思考电机有限公司 | piezoelectric actuator, linear drive device and electronic device |
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