CN113325543A - Camera motor, camera and electronic device - Google Patents
Camera motor, camera and electronic device Download PDFInfo
- Publication number
- CN113325543A CN113325543A CN202110683984.8A CN202110683984A CN113325543A CN 113325543 A CN113325543 A CN 113325543A CN 202110683984 A CN202110683984 A CN 202110683984A CN 113325543 A CN113325543 A CN 113325543A
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- CN
- China
- Prior art keywords
- circuit board
- sensing module
- image sensing
- camera
- camera motor
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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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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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
- G03B13/36—Autofocus systems
Abstract
The invention relates to a camera motor, which comprises a fixed part, an image sensing module serving as a movable part, an elastic piece which is connected between the image sensing module and the fixed part and allows the image sensing module to move along a preset axis, and a driving device for driving the image sensing module to move along the preset axis. The image sensing module comprises a first circuit board, an image sensor fixed on the first circuit board, a light filter arranged on the front side of the image sensor, and a support arranged on the front side of the light filter. The support is fixedly connected with the first circuit board. The bracket has a hole formed in the middle thereof, and the filter seals the hole to prevent dust from falling on the image sensor. The camera motor of the camera realizes automatic focusing by driving the image sensing module to move in the direction of the optical axis by the driving device, reduces the overall height of the camera motor, can realize automatic focusing by adopting smaller electromagnetic thrust, and avoids the influence of the weight of the lens part on the movement of the movable part. Whole image sensing module leakproofness is good, and inside the module can't enter into the module to outside dust foreign matter after the module encapsulation, avoided or reduced the influence of dust foreign matter, promoted the influence quality.
Description
Technical Field
The invention relates to a camera motor, a camera using the same and an electronic device.
Background
Most of the existing miniature cameras use a voice coil driving device to drive a lens to move along an optical axis direction to achieve automatic focusing, however, in order to achieve high pixel, the size and weight of the lens are increasingly large, and therefore, the driving structure needs to be improved. At present, an automatic focusing scheme is realized by driving an image sensor assembly to move back and forth, but the automatic focusing scheme is complex in structure and high in overall height.
Disclosure of Invention
The invention aims to provide a camera motor, a camera and an electronic device which have simple structures and low overall height.
A camera motor defining a subject to be located in front of the camera motor, the camera motor comprising: the fixing part comprises a base and a shell covering the base, wherein the front end surface of the shell is provided with a through hole, and a lens fixing part for fixing a lens is arranged at the through hole; an image sensing module as a movable part; an elastic member connected between the image sensing module and the fixing portion, allowing the image sensing module to move along a predetermined axis; and the driving device is used for driving the image sensing module to move along the preset shaft. Wherein, the image sensing module includes: a first circuit board; an image sensor fixed on the first circuit board; the optical filter is arranged on the front side of the image sensor; and the bracket is arranged on the front side of the optical filter and is fixedly connected with the first circuit board. Wherein, the support middle part forms the hole, the light filter seals this hole in order to prevent the dust from falling on the image sensor.
In one embodiment, the driving device comprises a driving magnet fixed on the inner side wall of the shell and a driving coil fixed on the outer periphery side of the bracket, and the driving coil and the driving magnet are opposite to each other with a gap; and a coil fixing part and a winding post for winding the tail end of the driving coil are formed on the outer periphery of the bracket, and the movable part and the fixing part are connected through damping glue.
As an embodiment, the elastic member includes a front plate spring connected between the front end of the bracket and the fixing portion, and the front plate spring includes an inner fixing portion, a wrist portion extending from the inner fixing portion in a meandering manner, and an outer fixing portion connected to the wrist portion; the inner side fixing part is fixedly connected with the front end of the support, and the outer side fixing part is fixedly connected with the fixing part.
In one embodiment, the first circuit board is a flexible circuit board, and a plurality of arm portions are integrally formed on the first circuit board near the outer periphery of the first circuit board, and the plurality of arm portions are rotationally symmetric about the preset axis or are symmetric about two mutually perpendicular axes passing through the preset axis, so that the outer periphery of the first circuit board is a plate-shaped spring.
As an embodiment, the camera motor further includes a second circuit board disposed in front of the first circuit board, a through hole is formed in the middle of the second circuit board to expose at least a portion of the image sensor, and the optical filter covers the through hole.
In one embodiment, a magnetic field sensor is fixed to a front side of the second circuit board, and a magnet is fixed to a position corresponding to the magnetic field sensor inside the housing.
As an embodiment, the first circuit board includes a central portion for fixedly connecting the image sensor, an outer ring portion disposed around the central portion, an extending portion extending from the outer ring portion, and a plurality of wrist portions symmetrically extending from the central portion and extending around the periphery of the central portion, and ends of the wrist portions are connected to the outer ring portion.
In one embodiment, a magnetic field sensor is fixed to the image sensing module, and a magnet is fixed to a position of the fixing portion corresponding to the magnetic field sensor.
The invention also provides a camera which comprises the camera motor.
The invention also provides an electronic device which comprises the camera.
The camera motor of the camera realizes automatic focusing by driving the image sensing module to move in the direction of the optical axis by the driving device, reduces the overall height of the camera motor, can realize automatic focusing by adopting smaller electromagnetic thrust, and avoids the influence of the weight of the lens part on the movement of the movable part. Whole image sensing module leakproofness is good, and inside the module can't enter into the module to outside dust foreign matter after the module encapsulation, avoided or reduced the influence of dust foreign matter, promoted the influence quality.
Drawings
Fig. 1 is an exploded view of a camera according to an embodiment.
Fig. 2 is a schematic structural diagram of a first circuit board of the camera in fig. 1.
Detailed Description
The camera motor, camera and electronic device of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Referring to fig. 1, in an embodiment, a camera of the present invention mainly includes a lens 10 and a camera motor 20 for holding the lens 10. For convenience of description, an XYZ axis coordinate system is defined such that an optical axis (a preset axis) of the camera coincides with the Z axis, and the subject is located forward (+ Z direction) in the Z axis direction.
The camera motor 20 mainly includes a base 21, a housing 22 covering the base, an image sensing module 23 accommodated in a space defined by the base and the housing, and a driving device for driving the image sensing module 23 to move. The base 21 and the housing 22 are connected together to form a fixing part of the camera motor, defining a receiving space.
The base 21 includes a bottom frame 211 made of an electrically insulating material, a plurality of fixing posts 212 extending forward from the bottom frame in a direction parallel to the Z axis, and a metal substrate 213 fixed in the bottom frame 211. The bottom frame 211 is formed with an opening in the middle thereof, and the metal substrate 213 seals the opening. The metal substrate 213 can be used as a heat dissipation component of the camera motor 20, so that the camera has good heat dissipation performance, and meanwhile, the metal substrate can be integrated with a conductive circuit inside, so that a specific circuit function can be realized. Fixed post 212 may have a protrusion 214 formed on the top.
The housing 22 includes a front panel 222 having an opening 221 formed in the middle thereof, a sidewall 223 extending from the periphery of the front panel 222 toward the base 21, and a lens holder 224 fixed at the opening 221 for holding the lens 10. The lens holder 224 may be formed in a ring shape, and an inner circumference thereof may be formed with a screw thread to be screwed with the lens 10, or an inner circumference thereof may be provided with a snap fit to the lens 10 to be fastened with the lens 10. The lens holder 224 is preferably made of metal to ensure a long and stable connection with the lens. The front panel 222 and the side walls 223 are preferably integrally injection molded of an electrically insulating material, such as plastic, to reduce the overall weight of the camera and prevent short circuits. The end of the side wall 223 is fixedly connected to the bottom frame 211 of the base 21. The side wall of the fixing post 212 should be tightly contacted with the side wall 223, so as to increase the contact area between the housing 22 and the base 21, and make the fixing portion of the camera motor more firm and stable.
The image sensing module 23 is disposed in the fixing portion, and as a movable portion of the camera motor, it mainly includes a first circuit board 231, an image sensor 232 and a second circuit board 233 fixed on the first circuit board 231, a filter 234 disposed in front of the image sensor 232 and the second circuit board 233, and a bracket 235 disposed in front of the filter 234.
The first circuit board 231 and the bracket 235 are fixedly connected together, for example, by gluing, and the rest of the components are fixed therebetween, so that the image sensing module 23 is an integral component. The first circuit board 231 is a flexible circuit board on which a plurality of wrist portions 2314 are integrally formed near the outer circumference, and the wrist portions 2314 are rotationally symmetrical about the Z-axis or symmetrical about two mutually perpendicular axes passing through the Z-axis, so that the outer circumference of the first circuit board 231 becomes a plate spring. Specifically, in the present embodiment, the first circuit board 231 includes a central portion 2311 for fixedly connecting the image sensor 232, an outer ring portion 2312 disposed around the central portion 2311, an extension portion 2313 extending from the outer ring portion 2312, and the plurality of wrist portions 2314. The center portion 2311 is an axisymmetric pattern having an axis parallel to the X-axis and the Y-axis as a symmetry axis. The outer ring portion 2312 is annular, and a gap is provided between the inner peripheral edge thereof and the outer peripheral edge of the central portion 2311, and the wrist portion 2314 is located in the gap. The two wrist portions 2314 integrally extend from the center portion of the + Y side of the center portion 2311 (the position where one of the symmetry axes of the center portion passes), then extend along the outer periphery of the center portion 2311 toward the-X direction and the + X direction, respectively, and reach and approach the center portions of the-X side and the + X side of the center portion 2311 (the position where the other symmetry axis of the center portion passes), respectively, and finally connect with the center portions of the sides of the-X side and the + X side of the outer ring portion 2312, respectively. The wrist portion may be meandered (changed in direction a plurality of times) as it extends between the outer ring portion 2312 and the center portion 2311 to generate a desired elastic deformation when necessary, allowing the center portion 2311 of the first circuit board 231 to move in the Z-axis direction relative to the outer ring portion 2312. In addition, a clearance for fixing column 212 to pass through is formed between wrist portion 2314 and outer ring portion 2312. Thus, when the image sensor module 23 is connected to the fixing portion, the outer ring 2312 of the first circuit board 231 is fixedly connected to the bottom frame 211 of the base 21, the fixing post 212 extends above/in front of the image sensor module 23 through the clearance, and the extension portion 2313 extends out of the space defined by the base 21 and the housing 22. Since the first circuit board 231 itself has a plate spring, the image sensing module 23 is allowed to move relative to the base 21, i.e., the fixing portion, along the Z-axis direction.
The image sensor 232 and the second circuit board 233 are fixed on the center portion 2311 and electrically connected to the internal circuit of the first circuit board 231. A through hole 2331 is formed in the middle of the second circuit board 233 to expose at least a portion of the image sensor 232. In this embodiment, the image sensor 232 is completely exposed in the through hole 2331. On the front surface of the second circuit board 233, there are fixed electronic components of a relatively large size, including a magnetic field sensor 2332. The optical filter 234 covers and seals the through hole 2331 from the front side of the second circuit board 233.
The middle of the supporter 235 is formed with a hole 2351 to allow light to pass through and reach the image sensor 232, and the size of the hole 2351 is smaller than that of the optical filter 234, thereby preventing dust from directly falling on the image sensor and the second circuit board from the through hole of the supporter. In addition, the back end face of the bracket 235 is further provided with a groove for fixing the optical filter 234, and in this embodiment, the optical filter 234 is adhered in the groove on the back side of the bracket by glue. The rear end face of the bracket 235 is further fixedly connected to the second circuit board 233, and a plurality of clearance spaces are formed on the rear end face for accommodating electronic components fixed on the front surface of the second circuit board 233, so as to reduce the height of the whole image sensing module 23. Specifically, a through hole 2352 is formed on the bracket 235 at a position opposite to the magnetic field sensor 2332 to expose the magnetic field sensor 2332. A magnet 24 is fixed to the rear surface of the front panel 222 of the housing 22 or to the lens holder 224, respectively. The magnet 24 is spaced apart from and opposed to the magnetic field sensor 2332, and detects the relative position of the image sensing module 23 and the fixed portion.
In this embodiment, the entire image sensing module 23 is connected to the fixing portion (base 21) by the plate spring of the first circuit board 231 itself, and is also connected to the fixing portion (housing 22) by the front plate spring 25 disposed in front of the bracket 235. The plate spring of the first circuit board 231 itself and the front plate spring 25 together constitute an elastic member connected between the image sensing module and the fixing portion, allowing the image sensing module to move along the Z-axis with respect to the fixing portion.
Specifically, the front plate spring 25 includes an inner fixing portion 251, a wrist portion 252 extending from the inner fixing portion 251 in a meandering manner, and an outer fixing portion 253 connected to the wrist portion. The inner fixing portion 251 is fixedly connected to the front end of the bracket 235, and the outer fixing portion 253 is fixedly connected to the protrusion 214 on the top of the fixing post 212 of the base 21. In the present embodiment, the front side plate spring 25 includes two independent plate springs. Each plate spring includes two sets of arm portions 252, the two sets of arm portions 252 extend from the inner fixing portion 251 and meander toward the + Y direction and the-Y direction, respectively, and an outer fixing portion 253 is disposed at an end of each set of arm portions 252. Correspondingly, a projection 2353 is formed on the front side end surface of the supporter 235 at the center of the edge near the + X side and the-X side. The inner fixing portions 251 of the two plate springs of the front side plate spring 25 are respectively and fixedly connected with the corresponding protrusions 2353, and the outer fixing portions 253 thereof are respectively and fixedly connected with the protrusions 214 on the tops of the corresponding fixing posts 212. Thus, the front plate spring 25 cooperates with the first circuit board 231 to support the image sensor module 23 in the fixing portion.
The driving device of the camera motor 20 is a voice coil driving device, and mainly includes a driving coil 261 fixed to the side wall of the holder 235 and a driving magnet 262 fixed to the inside of the side wall 223 of the housing 22. The drive coil 261 and the drive magnet 262 are opposed to each other with a gap therebetween. Correspondingly, a coil fixing portion 2354 and a winding post 2355 are formed on a side wall of the supporter 235. After the wire led out from the driving coil is wound on the winding post 2355, the wire can be electrically connected with the second circuit board or the first circuit board downwards, the conductive path is simpler, and the plate spring does not need to be used as the conductive path any more. In this embodiment, two sets of spaced opposing drive coils and drive magnets are provided, one on the + Y side and one on the-Y side of the support 235. Thus, the driving device is disposed on the + Y side and the-Y side of the image sensor module 23, and the front side plate spring 25 is disposed on the + X side and the-X side of the image sensor module 23, i.e. viewed from the Z-axis direction, the driving device and the front side plate spring are disposed in a staggered manner, so that the mutual interference between the driving device and the front side plate spring in the structure can be avoided, and the overall height of the camera motor can be further reduced. Further, since the driving coil 261 having a light weight in the driving device is fixed to the image sensing module 23, the movable portion required for suspension support of the front plate spring 25 and the plate spring of the first circuit board 231 itself has a light weight, the driving force required for the driving device is small, the size requirements for the driving magnet and the driving coil are reduced, and the camera motor can be further made thin and light.
In addition, in the embodiment, the winding post 2355 is opposite to the fixing post 212 of the base 21 in a spaced manner, and damping glue is arranged between the winding post 2355 and the fixing post 212, so that one end of the damping glue wraps at least part of the winding post 2355, and the other end of the damping glue is bonded with the fixing post 212, thereby realizing the vibration reduction effect during the closed-loop control of the lens motor.
In the above embodiment, the base 21 includes the bottom frame 211 made of an electrically insulating material, a plurality of fixing posts 212 extending forward from the bottom frame in a direction parallel to the Z axis, and the metal substrate 213 fixed in the bottom frame 211. As a modification of this embodiment, the bottom frame has a plate shape without an opening formed in the middle portion thereof, and the circuit may be wrapped therein by injection molding.
In the above embodiments, the second circuit board is provided in addition to the first circuit board, and it is understood that in other embodiments, the second circuit board may be omitted, and the circuits and components on the second circuit board may be integrated on the first circuit board. At this time, the bracket is fixedly connected with the inner side of the wrist of the first circuit board.
In the above embodiment, the plate spring of the first circuit board includes four arm portions, and it is understood that more than four arm portions may be provided as long as the arm portions are rotationally symmetrical about the Z axis or are symmetrical about two mutually perpendicular axes passing through the Z axis. Further, the outer ring portion 2312 may be divided into two or four portions independent of each other. The center portion 2311 of the first fixing plate 231 may be plate-shaped or ring-shaped or several portions independent of each other.
As a modification, the front plate spring may be omitted or divided into four parts.
As a modification, the outer fixing portion of the front side plate spring may be fixedly connected to the housing, that is, may be fixedly connected to the fixing portion.
As a modification, the through hole 2352 for exposing the magnetic field sensor 2332 may not be formed at a position opposite to the magnetic field sensor 2332 on the support 235.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.
Claims (10)
1. A camera motor defining a subject to be positioned in front of the camera motor, the camera motor comprising:
the fixing part comprises a base and a shell covering the base, wherein the front end surface of the shell is provided with a through hole, and a lens fixing part for fixing a lens is arranged at the through hole;
an image sensing module as a movable part;
an elastic member connected between the image sensing module and the fixing portion, allowing the image sensing module to move along a predetermined axis; and
the driving device is used for driving the image sensing module to move along the preset shaft;
wherein, the image sensing module includes:
a first circuit board;
an image sensor fixed on the first circuit board;
the optical filter is arranged on the front side of the image sensor; and
the bracket is arranged on the front side of the optical filter and is fixedly connected with the first circuit board;
wherein, the support middle part forms the hole, the light filter seals this hole in order to prevent the dust from falling on the image sensor.
2. The camera motor according to claim 1, wherein the driving means includes a driving magnet fixed to an inner wall of the housing and a driving coil fixed to an outer peripheral side of the holder, the driving coil and the driving magnet being opposed to each other with a space therebetween; and a coil fixing part and a winding post for winding the tail end of the driving coil are formed on the outer periphery of the bracket, and the movable part and the fixing part are connected through damping glue.
3. The camera motor according to claim 1, wherein the elastic member includes a front plate spring connected between the front end of the bracket and the fixing portion, the front plate spring including an inner fixing portion, a wrist portion extending from the inner fixing portion in a meandering manner, and an outer fixing portion connected to the wrist portion; the inner side fixing part is fixedly connected with the front end of the support, and the outer side fixing part is fixedly connected with the fixing part.
4. The camera motor according to claim 1, wherein the first circuit board is a flexible circuit board, and a plurality of arm portions are integrally formed on the first circuit board near an outer periphery thereof, and the plurality of arm portions are rotationally symmetrical about the predetermined axis or are symmetrical about two mutually perpendicular axes passing through the predetermined axis, so that the outer periphery of the first circuit board becomes a plate spring.
5. The camera motor of claim 4, further comprising a second circuit board disposed in front of the first circuit board, wherein a through hole is formed in a middle portion of the second circuit board to expose at least a portion of the image sensor, and the filter covers the through hole.
6. The camera motor according to claim 5, wherein a magnetic field sensor is fixed to a front side of the second circuit board, and a magnet is fixed to a position corresponding to the magnetic field sensor inside the housing.
7. The camera motor of claim 6, wherein the first circuit board comprises a central portion for fixedly connecting the image sensor, an outer ring portion disposed around the central portion, an extension portion extending from the outer ring portion, and the plurality of wrist portions symmetrically extending from the central portion and extending around the periphery of the central portion, and the ends of the wrist portions are connected to the outer ring portion.
8. The camera motor according to claim 1, wherein a magnetic field sensor is fixed to the image sensing module, and a magnet is fixed to a position of the fixing portion corresponding to the magnetic field sensor.
9. A camera characterized by comprising the camera motor of any one of claims 1 to 8.
10. An electronic device comprising the camera of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683984.8A CN113325543A (en) | 2021-06-21 | 2021-06-21 | Camera motor, camera and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683984.8A CN113325543A (en) | 2021-06-21 | 2021-06-21 | Camera motor, camera and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113325543A true CN113325543A (en) | 2021-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110683984.8A Pending CN113325543A (en) | 2021-06-21 | 2021-06-21 | Camera motor, camera and electronic device |
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| Country | Link |
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| CN (1) | CN113325543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022075A1 (en) * | 2022-07-28 | 2024-02-01 | Oppo广东移动通信有限公司 | Support, light filter assembly, camera and electronic device |
-
2021
- 2021-06-21 CN CN202110683984.8A patent/CN113325543A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022075A1 (en) * | 2022-07-28 | 2024-02-01 | Oppo广东移动通信有限公司 | Support, light filter assembly, camera and electronic device |
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