CN113777741B - Continuous zoom driving yoke set, assembling method, lens driving device and image pickup device - Google Patents
Continuous zoom driving yoke set, assembling method, lens driving device and image pickup device Download PDFInfo
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- CN113777741B CN113777741B CN202111035011.XA CN202111035011A CN113777741B CN 113777741 B CN113777741 B CN 113777741B CN 202111035011 A CN202111035011 A CN 202111035011A CN 113777741 B CN113777741 B CN 113777741B
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- 238000000034 method Methods 0.000 title claims description 14
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- 241001227561 Valgus Species 0.000 claims 2
- 241000469816 Varus Species 0.000 claims 2
- 230000003287 optical effect Effects 0.000 description 25
- 230000007246 mechanism Effects 0.000 description 11
- 230000004323 axial length Effects 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000007306 turnover Effects 0.000 description 5
- 230000002265 prevention Effects 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 239000003351 stiffener Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000004080 punching Methods 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
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- Optics & Photonics (AREA)
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Abstract
The present invention relates to a continuous-zoom driving yoke set. It has solved the high technical problem of current cost. The continuous zooming driving magnetic yoke group comprises a rotary drum, wherein the rotary drum is arranged in the cavity, one axial end of the rotary drum is rotationally connected with the shell, and the other axial end of the rotary drum extends towards the base side and is free; a rotor yoke which is cylindrical and sleeved on the outer wall of the rotary drum; the rotor magnetic yoke is fixedly connected with the circumference of the rotary drum; a plurality of stator yokes fixed on the base, each stator yoke having a coil slot therein; the stator magnet yoke is distributed on the periphery of the rotor magnet yoke in the circumferential direction by taking the axial lead of the rotor magnet yoke as the center. The invention has the advantages that: the cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of camera motors, and particularly relates to a continuous zooming driving magnetic yoke set, an assembling method, a lens driving device and an imaging device.
Background
The miniature camera long-focus lens is widely applied to high-end mobile phones, and the applied image sensor pixels are also improved from 800 ten thousand pixels to more than 1 hundred million pixels, so that the equivalent focal length of the miniature lens is far beyond the thickness of the mobile phone body. Although periscope type motors are a mature solution for mobile phone tele cameras, pixels are greatly improved, the outer diameter of a lens is also larger and larger, and the periscope type motors are limited in application. Therefore, the telescopic camera of the miniature lens barrel not only can solve the problem that the long-focus lens with the oversized pixels is arranged and used on the mobile phone, but also can greatly improve the image quality.
The inventor utilizes the cooperation of the stator and the rotor to drive the bearing frame to focus in the axial direction of the optical axis (such as Chinese patent publication No. CN 101595429B), and the focusing stroke is increased in the mode, and the principle of the mode is as follows: the stator drives the rotor to rotate, the stator is arranged on the base or the shell, the rotor is arranged on the bearing frame, and the stator and the bearing frame are in threaded connection to drive the bearing frame to focus in the axial direction of the optical axis. The disadvantage of this approach is that:
The stator and the rotor need longer cooperation stroke, lead to stator yoke and rotor yoke at the axial length of optical axis longer, and length is longer leads to the cost to increase, still leads to the volume increase of final motor simultaneously, and the design is unreasonable.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a continuous-zoom-drive yoke set, an assembling method, a lens driving device, and an imaging device, which can solve the above problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
This continuous variable focus drive yoke group is located the cavity that base and shell formed, continuous variable focus drive yoke group includes:
a rotary drum which is arranged in the cavity and has one axial end rotationally connected with the shell, and the axial direction of the rotary drum is fixed relative to the shell; the other axial end of the rotary drum extends towards the base side and is free;
a rotor yoke which is cylindrical and sleeved on the outer wall of the rotary drum;
the rotor magnetic yoke is fixedly connected with the circumference of the rotary drum;
A plurality of stator yokes fixed on the base, each stator yoke having a coil slot therein;
the stator magnet yoke is distributed on the periphery of the rotor magnet yoke in the circumferential direction by taking the axial lead of the rotor magnet yoke as the center.
The bearing plays a suspending role, namely, one end of the rotary drum far away from the base is rotationally connected with the shell, and one end of the rotary drum close to the base is free. The structure can effectively reduce the manufacturing cost and improve the assembly efficiency, and simultaneously, the structure can also meet the requirement of rotation driving.
In the continuous zooming driving magnetic yoke set, a turnover edge is arranged at one end, close to the rotary drum, of the rotor magnetic yoke, which is rotationally connected with the shell.
In the above-described continuous-zoom-drive yoke set, the stator yoke has four and the cavity is square, and the stator yoke is located at four corners of the cavity.
In the continuous zooming driving magnetic yoke set, the stator magnetic yoke comprises a base fixing plate at a central position, an inward turning edge is connected to the inner side edge of the base fixing plate, which is close to the rotor magnetic yoke, an outward turning edge is connected to the outer side edge of the base fixing plate, which is far away from the rotor magnetic yoke, and the base fixing plate, the inward turning edge and the outward turning edge form the coil groove.
In the continuous zooming driving magnetic yoke set, the inward turning edge is an arc turning edge, the outward turning edge is a flat turning edge, and the circumference of the inward turning edge along the circumferential direction of the rotor magnetic yoke is larger than the length of the outward turning edge along the circumferential direction of the rotor magnetic yoke.
In the continuous zooming driving magnetic yoke set, the axial lead of the inward turning edge is coincident with the axial lead of the rotor magnetic yoke.
In the continuous zooming driving magnetic yoke set, the inward turning edge is perpendicular to the base fixing plate, and the inner surface of the inward turning edge, which is close to the rotor magnetic yoke, is an arc concave surface, and the center of the arc concave surface is on the axis of the rotor magnetic yoke.
In the continuous zooming driving magnetic yoke set, the outer surface of the inward turning edge is an arc convex surface, and the center of the arc concave surface is overlapped with the center of the arc convex surface.
In the continuous zooming driving magnetic yoke group, the turnover edge is perpendicular to the rotor magnetic yoke, and a plurality of magnetic pole matching notches which are uniformly distributed in the circumference are arranged on the turnover edge.
A method of assembling a continuous variable focus drive yoke set, the method for assembling the continuous variable focus drive yoke set, the method comprising the steps of:
a1, sleeving a rotor magnetic yoke on the outer wall of the rotary drum;
stator yokes are respectively arranged at a plurality of yoke setting positions of the base close to one end face of the shell, and the stator yokes are distributed on the same circumference;
a2, rotatably connecting one end of the rotary drum in the step a1 with the shell;
a3, fixing the shell in the step a2 at a shell setting position of the base, wherein stator yokes fixed on the base are distributed on the periphery of the rotor yokes in the circumferential direction, and a space is formed between each stator yoke and each rotor yoke, wherein the space is equal.
The invention also provides a lens driving device which is provided with the continuous zooming driving magnetic yoke group.
The invention also provides an image pickup device, which is provided with the lens driving device.
The invention also provides electronic equipment, which is provided with the image pickup device.
Compared with the prior art, the invention has the advantages that:
The axial direction of the rotary drum is fixed relative to the base and can rotate, on the premise that the rotary drum greatly shortens the axial length of the magnetic yokes of the stator and the rotor in the optical axis, the design can reduce the axial length of the optical axis of the lens driving device, and the rotary drum can be applied to thinner or ultrathin camera terminals.
The split design of the stator yoke can greatly reduce the manufacturing cost and the radial dimension of the lens driving device.
Each stator magnetic yoke is provided with a coil groove, so that the stator magnetic yoke can be manufactured in a standardized mode, the precision is controllable, the coil is built in, the coil can be protected, and the final assembly efficiency and the final assembly precision can be ensured.
The rotor yoke can be prevented from being exposed outside the shell by utilizing the mode that the rotary drum rotates and is axially and relatively fixed, so that the service life of the rotor yoke is prolonged, and the driving coordination stability of the rotor and the stator is ensured.
Drawings
Fig. 1 is a schematic view of a lens driving device according to the present invention.
Fig. 2 is a schematic cross-sectional view of fig. 1 taken along line B-B.
Fig. 3 is a schematic perspective view of a lens driving device according to the present invention.
Fig. 4 is an exploded view of a lens driving device according to the present invention.
Fig. 5 is a schematic view of a housing structure of a lens driving device according to the present invention.
Fig. 6 is a schematic view of a drum structure of a lens driving device according to the present invention.
Fig. 7 is a schematic structural diagram of an image capturing apparatus according to the present invention.
Fig. 8 is a schematic structural diagram of an electronic device provided by the present invention.
FIG. 9 is a schematic cross-sectional view of the structure taken along line C-C in FIG. 1.
Fig. 10 is a schematic view of a yoke assembly according to the present invention.
In the drawing, a base 1, a rotor 2, an internal thread 20, an external bearing fixing step 21, a telescopic barrel 3, an external thread 30, a restraint mechanism 4, a front restraint hole 40, a restraint polish rod 41, a restraint stiffener ring 42, an inner ring groove 420, a rear restraint hole 43, a sub restraint through hole 430, a housing 5, a bearing fixing portion 50, an internal bearing fixing step 500, a shielding portion 51, a bearing 6, a rotor yoke 70, a turnover edge 71, a magnetic pole fitting notch 72, a stator yoke 80, a coil groove 81, a base fixing plate 82, an inversion edge 83, an inversion edge 84.
Detailed Description
The following are specific embodiments of the invention and the technical solutions of the invention will be further described with reference to the accompanying drawings, but the invention is not limited to these embodiments.
Example 1
As shown in fig. 4 and 9 to 10, the lens driving device includes a continuous-zoom driving yoke set, specifically, the continuous-zoom driving yoke set of the present embodiment is located in a chamber formed by the base 1 and the housing 5, the yoke set including the drum 2, the rotor yoke 70, and the stator yoke 80.
The rotary drum 2 is arranged in the cavity, one axial end of the rotary drum 2 is rotationally connected with the shell 5, the rotary drum 2 is axially fixed relative to the shell 5, and the other axial end of the rotary drum 2 extends towards the base 1 side and is free;
The axial direction of the rotary drum is fixed relative to the base and can rotate, the length of the rotary drum is greatly shortened on the premise, meanwhile, the lengths of the rotor magnet yoke and the stator magnet yoke in the axial direction of the optical axis are greatly shortened, and the design can reduce the axial length of the optical axis of the lens driving device and can be applied to thinner or ultrathin camera terminals.
The rotor magnetic yoke 70 is cylindrical and sleeved on the outer wall of the rotary drum 2; the rotor yoke 70 is fixedly connected with the rotary drum 2 in the circumferential direction; the circumferentially fixed connection may be made with an interference fit or the like.
Preferably, an end face of the rotor yoke 70 near the base 1 and an end face of the drum near the base 1 of the present embodiment are flush. While the axial length of the rotor yoke 70 is smaller than the axial length of the drum 2, the remaining length being for bearing mounting.
The stator yokes 80 are provided with a plurality of stator yokes and are fixed on the base 1, and each stator yoke is provided with a coil groove 81; the stator yokes 80 can greatly reduce the processing cost and the processing difficulty of the stator yokes. Secondly, the coil slots 81 provided can be used for mounting coil windings, and in the assembly process, the stator yoke 80 can protect coils from leakage caused by damage due to frequent contact of the coils, or from deformation or even damage of the coils, thereby affecting assembly and subsequent use.
The stator yoke 80 is distributed around the rotor yoke 70 circumferentially around the axis of the rotor yoke 70. Preferably, the stator yoke 80 of the present embodiment has four cavities and the cavities are square, and the stator yoke 80 is located at four corners of the cavities. The stator yoke is installed by fully utilizing the spare space at the corner of the cavity, so that the whole structure is more compact, and the radial size of the shell can be greatly reduced to meet the development requirement of the miniaturized motor.
Secondly, each corner of the cavity is used for positioning the stator yoke, so that the assembly efficiency can be improved, and the assembly accuracy is ensured.
The rotor yoke 70 is provided with a flap edge 71 near the end of the drum 2 which is rotatably connected to the housing 5. The turnup edge is perpendicular to the rotor yoke, and a plurality of magnetic pole matching notches 72 which are uniformly distributed in the circumference are arranged on the turnup edge. When the rotor magnet ring is assembled, the rotor magnet ring is sleeved on the outer wall of the rotor magnet yoke 70, and meanwhile, one end of the rotor magnet ring is propped against the turnover edge 71.
The rotor magnet ring of this embodiment is an integral ring or a plurality of tile-shaped magnet blocks circumferentially distributed around the rotor yoke 70. When tile-shaped magnet blocks are selected, the gaps between adjacent blocks are aligned with the pole mating notches 72.
Specifically, each stator yoke 80 of the present embodiment includes a base fixing plate 82 in a central position, the base fixing plate 82 is fixed on the base 1, the base fixing plate 82 is fixed by using a jig or a preset setting limit on the base 1 to position, an inside edge of the base fixing plate 82 close to the rotor yoke 70 is connected with an inside-out flange 83, an outside edge of the base fixing plate 82 far away from the rotor yoke 70 is connected with an outside-out flange 84, and the base fixing plate 82, the inside-out flange 83 and the outside-out flange 84 form the coil slot 81.
The inside-out flange 83 and the outside-out flange 84 are perpendicular to the base fixing plate 82, respectively.
The clearance between the inward turning edge 83 and the turning edge 71 prevents the stator and the rotor from being worn and damaged due to contact.
Preferably, the inside-out flange 83 of the present embodiment is a circular arc flange, the outside-out flange 84 is a flat plate flange, and the circumference of the inside-out flange 83 along the circumferential direction of the rotor yoke 70 is greater than the length of the outside-out flange 84 along the circumferential direction of the rotor yoke 70. The inner turned edge 83 has a longer circumference along the circumference of the rotor yoke 70, and can guide the magnetic force lines of the electrified coils to be transmitted inwards to the rotor magnet ring, so as to achieve the driving purpose.
The axis of the inward turning edge 83 coincides with the axis of the rotor yoke 70. The rotor rotation stability is ensured.
Further, the inward turning edge of the embodiment is perpendicular to the base fixing plate, and the inner surface of the inward turning edge, which is close to the rotor magnetic yoke, is an arc concave surface, and the center of the arc concave surface is on the axis of the rotor magnetic yoke.
In the continuous zooming driving magnetic yoke set, the outer surface of the inward turning edge is an arc convex surface, and the center of the arc concave surface is overlapped with the center of the arc convex surface.
The assembling method of the continuous zooming driving magnetic yoke group comprises the following steps:
a1, sleeving a rotor magnetic yoke 70 on the outer wall of the rotary drum 2;
Stator yokes 80 are respectively arranged at a plurality of yoke setting positions of the base 1, which are close to one end face of the shell 5, and the stator yokes 80 are distributed on the same circumference;
a2, one end of the rotary drum 2 in the step a1 is rotatably connected with the shell 5;
a3, fixing the shell 5 in the step a2 at a shell setting position of the base 1, wherein the stator yokes 80 fixed on the base 1 are distributed on the periphery of the rotor yoke 70 in the circumferential direction, and each stator yoke 80 and each rotor yoke 70 form a space, and the spaces are equal.
As shown in fig. 1 to 3, the lens driving device further includes a telescopic lens barrel 3, a restraining mechanism 4, a transmission structure and a bearing 6, and the base 1 is in the shape of an annular plate.
The shell 5 is buckled on one surface of the base 1 in the thickness direction, a cavity is formed between the base 1 and the shell 5, and the shell 5 plays a role in protection.
Preferably, the drum 2 rotates with respect to the base 1 and the drum 2 is fixed with respect to the axial housing and the base 1, i.e. in the axial direction of the optical axis, the axial direction of said drum 2 does not move. Further, the end of the drum 2 remote from the base 1 is rotatably connected to the housing 5 in this embodiment, and specifically, a bearing 6 is connected to the housing 5 and the drum 2, the bearing 6 causing the drum 2 to rotate about the optical axis.
Further, a bearing fixing portion 50 having an inner bearing fixing step 500 is provided at the top of the housing 5, the bearing 6 is a ball bearing, an outer ring of the bearing 6 is fixed on the inner bearing fixing step 500, and an inner ring of the bearing 6 is sleeved on an outer wall of one end of the drum 2 away from the base 1.
The outer circumferential surface of the outer ring of the bearing 6 is fixed to the circumferential surface of the inner bearing fixing step 500, and the upper circular end surface of the outer ring of the bearing 6 is fixed to the upper circular surface of the inner bearing fixing step 500 in such a manner that it increases the fixing connection area to ensure the bearing fixing stability. Of course, glue may be provided between the bearing outer race and the inner bearing fixing step 500 to improve fixing strength.
Next, as shown in fig. 2 and fig. 5 to fig. 6, an outer bearing fixing step 21 is provided at an end of the outer wall of the drum 2 away from the base 1, the inner ring of the bearing 6 is fixed to the outer bearing fixing step 21, and similarly, the inner circumferential surface and the lower circular end surface of the inner ring of the bearing 6 are respectively fixed to the circumferential surface and the lower circular surface of the outer bearing fixing step 21, and glue may be provided to strengthen the strength of fixing the inner ring to the outer bearing fixing step 21.
The inner bearing fixing step 500 is located at the outer side of the outer bearing fixing step 21, and the inner bearing fixing step 500 and the outer bearing fixing step 21 are surrounded to form a bearing accommodating annular space.
In addition, an end surface of the drum 2 away from the base 1 is located above an end surface of the inner ring of the bearing 6 away from the base 1, and the fixing firmness of the inner ring of the bearing can be ensured in an uneven manner.
Preferably, the bearing fixing portion 50 of the present embodiment protrudes from the top of the housing 5. A shielding part 51 which is sleeved on the periphery of the telescopic lens barrel 3 and is shielded above one end surface of the rotary drum 2 far from the base 1 is connected to the top of the bearing fixing part 50 far from the shell 5. The shielding portion 51 serves the purposes of dust prevention, water prevention and the like, and can prolong the service life of the bearing.
The housing 5, the bearing fixing portion 50 and the shielding portion 51 of the present embodiment are connected into an integral structure, that is, the three materials are the same, the housing 5 is manufactured and molded in advance, and then the bearing fixing portion 50 and the shielding portion 51 are molded by punching or other methods.
The telescopic lens barrel 3 is used for bearing lenses, one end of the telescopic lens barrel 3 is sleeved with the rotary drum 2, and the other end of the telescopic lens barrel 3 is far away from the base 1. Preferably, the axis of the rotary drum 2 and the axis of the telescopic lens barrel 3 in the embodiment are coincident, so that the axis is coincident with the optical axis a, and focusing accuracy and subsequent imaging quality are realized.
The restraint mechanism 4 is connected with the base 1 and the telescopic lens barrel 3; the restraining mechanism 4 locks the telescopic lens barrel 3 relative to the base 1 in the circumferential direction, and the restraining mechanism 4 enables the axial lead of the telescopic lens barrel 3 to coincide with the optical axis, which is the optical axis of incident light.
The transmission structure is arranged between the rotating drum 2 and one sleeved end of the telescopic lens barrel 3; the transmission structure is used to transmit a rotational driving force to the telescopic cylinder 3 when the drum 2 rotates to force the telescopic cylinder 3 to move in the optical axis axial direction.
In this embodiment, by using the synergistic effect of the transmission structure and the constraint mechanism 4, the telescopic lens barrel 3 can be moved in the axial direction of the optical axis under the driving of the rotation driving force, so that the axial line of the telescopic lens barrel 3 bearing the lens can be ensured to always coincide with the optical axis, and the image pickup quality is greatly improved on the premise of meeting the requirement of large-stroke focusing. Second, with the design of the outer barrel 2 and the inner telescopic barrel 3, it reduces the difficulty of manufacturing and manufacturing costs.
Further, the drum 2 of the present embodiment is fixed in the axial direction with respect to the base 1, and the drum 2 is greatly shortened in length on the premise that the design can reduce the axial length of the optical axis of the lens driving device, and thus can be applied to a thinner or ultra-thin image pickup terminal.
Preferably, the transmission structure of the present embodiment is a threaded transmission structure. Further, the rotary drum 2 is sleeved on the outer wall of the telescopic lens barrel 3, the transmission structure comprises an internal thread 20 arranged on the inner wall of the rotary drum 2, an external thread 30 is arranged on the outer wall of the telescopic lens barrel 3, and the internal thread 20 is in threaded connection with the external thread 30. The structure can prevent the lens in the telescopic lens barrel 3 from contacting with the end face of the rotary drum 2 close to the telescopic lens barrel 3, and simultaneously, the distribution and the assembly of the constraint mechanism can be facilitated.
The internal thread 20 is longer than the external thread 30.
That is, the inner wall of the rotary drum 2 is provided with the internal thread, one end of the outer wall of the telescopic lens barrel 3 close to the base 1 is provided with the external thread 30, the rest of the outer walls of the telescopic lens barrel 3 are not provided with the external thread, the diameter of the outer wall of the telescopic lens barrel 3 without the external thread is smaller than the bottom diameter of the external thread, the rotary drum 2 is arranged in the shell and is rotationally connected with the shell, and the telescopic lens barrel 3 can extend out of the shell and be contained in the rotary drum 2, so that a better dustproof and waterproof effect is achieved. The shielding part 51 is sleeved on the outer wall of the telescopic lens barrel 3 without external threads.
Preferably, as shown in fig. 2 and 4, the restraint mechanism 4 of the present embodiment includes a plurality of front restraint holes 40 that are disposed on the wall thickness of the telescopic lens barrel 3 and are circumferentially distributed, the number of the front restraint holes 40 is 2-4 and are circumferentially uniformly distributed, the front restraint holes 40 are parallel to the axis of the telescopic lens barrel 3, the restraint mechanism 4 further includes a plurality of restraint polish rods 41 that are located in the drum 2, one ends of the restraint polish rods 41 are fixed on the base 1, and the other ends of the restraint polish rods 41 are inserted into the corresponding front restraint holes 40 one by one.
The front restraint hole 40 is arranged at a half position of the wall thickness (single-side wall thickness) of the telescopic lens barrel 3, so that the front restraint hole 40 has very good radial deformation resistance and is convenient to process and manufacture.
The front constraint holes 40 distributed circumferentially can position constraint the constraint polish rod 41, and can also constrain the axial lead position of the telescopic lens barrel 3. The front restraint aperture 40 and restraint polish rod 41 are slightly clearance fit.
Second, the front restriction hole 40 of the present embodiment is a blind hole, and the orifice of the front restriction hole 40 faces the base 1. The blind hole can play a role in limiting the focusing limit position, and secondly, the purposes of dust prevention and the like can be achieved.
In addition, a fixing groove and a constraint reinforcing ring 42 fixed in the fixing groove are arranged at one end of the inner wall of the telescopic lens barrel 3 near the orifice of the front constraint hole 40, a plurality of rear constraint holes 43 are arranged on the constraint reinforcing ring 42, the number of the rear constraint holes 43 is equal to that of the front constraint holes 40, and one front constraint hole 40 is communicated with one rear constraint hole 43.
The axes of the front constraining holes 40 and the rear constraining holes 43 coincide so that the axes of the constraining reinforcing rings 42 coincide with the optical axes to have a very high optical axis coincidence. The constraint reinforcing ring 42 is used for reinforcing radial strength of a section provided with external threads, and can also be used for constraining the polished rod 41 at different positions.
An inner ring groove 420 is arranged on the inner wall of the constraint reinforcing ring 42, each rear constraint hole 43 is divided into two sub constraint through holes 430 which are distributed in sequence along the axial direction of the optical axis and are mutually communicated by the inner ring groove 420, and the constraint polish rod 41 is always inserted into one sub constraint through hole 430 close to one side of the base 1. The inner ring groove 420 reduces the contact area with the constraint polish rod 41 to reduce focusing resistance, improve efficiency, and facilitate lens mounting and fixing.
The inner wall of the restraint reinforcement ring 42 and the inner wall of the telescopic cylinder 3 are equal to or slightly smaller than the inner wall of the telescopic cylinder 3.
The end face of the restraint reinforcement ring 42 near the base 1 and the end face of the telescopic barrel 3 near the base 1 are flush.
One sub-constraint through hole 430 always carries out radial position constraint on the constraint polish rod 41, in addition, one end of the constraint reinforcing ring 42, which is close to the front constraint hole 40, can radially strengthen the orifice of the front constraint hole 40 so as to prevent the constraint polish rod 41 from being inserted for focusing adjustment due to the deformation of the front constraint hole 40, and the other end of the constraint reinforcing ring 42, which is far away from the front constraint hole 40, is used for radially strengthening the inner wall of one end of the telescopic lens barrel 3, which is close to the base.
Secondly, an arc convex surface is arranged at one end of the constraint polish rod 41 far away from the base 1, and the structure can play a role in guiding.
The constraint enforcement ring 42 of the present embodiment has two forms:
first, the confinement stiffener ring 42 is of unitary construction;
second, the restraint stiffener ring 42 includes an L-shaped portion and a base portion that is located at one vertical end of the L-shaped portion such that the L-shaped portion and the base portion enclose an inner ring groove 420.
The working principle of this embodiment is as follows:
the rotary drum 2 rotates relative to the base 1 and the shell 5 under the drive of rotary driving power;
The internal thread of the inner wall of the rotary drum 2 and the external thread of the outer wall of the telescopic lens barrel 3 cooperate to push the telescopic lens barrel 3 to axially move on the optical axis under the action of the constraint mechanism 4.
The rotor is rotatable and axially relatively fixed, the axial position of the rotor can be always in an axial position to rotate around the optical axis, at the moment, the stator coil assembly can drive the rotor to move around the optical axis only by providing electromagnetic force in the circumferential direction of the rotor, and the rotor is arranged on the rotor, so that the rotor can be ensured to be driven by driving force generated by the stator coil assembly and the rotor to move around the optical axis, the axial lengths of the stator and the rotor in the optical axis can be greatly shortened under the condition of meeting driving, and the manufacturing cost of the rotor and the stator is greatly reduced.
Alternatively, the restraint mechanism 4 includes a bar-shaped groove provided on the outer wall of the telescopic barrel 3 and distributed along the axial direction of the telescopic barrel 3, and a bar-shaped protrusion provided on the top of the housing for being engaged with the bar-shaped groove one by one. This way also allows axial displacement of the telescopic barrel in the optical axis.
Example two
As shown in fig. 3, the present lens driving apparatus has the continuous-zoom driving yoke set according to the first embodiment.
Example III
As shown in fig. 7, the present imaging apparatus includes a lens driving apparatus according to the second embodiment, and a lens is mounted on the lens driving apparatus.
Example IV
As shown in fig. 8, the present electronic apparatus has an imaging device according to the third embodiment. Electronic devices such as: cell phones, tablets, and computers, etc.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. The continuous zooming driving magnetic yoke group is positioned in a cavity formed by the base (1) and the shell (5), and is characterized in that the continuous zooming driving magnetic yoke group comprises:
a rotary drum (2) which is arranged in the cavity and is rotationally connected with the shell (5) at one axial end, wherein the rotary drum (2) is axially fixed relative to the shell (5);
A rotor yoke (70) which is cylindrical and sleeved on the outer wall of the rotary drum (2);
the rotor magnet yoke (70) is fixedly connected with the rotating drum (2) in the circumferential direction;
a stator yoke (80) which is provided with a plurality of stator yokes and is fixed on the base (1), wherein each stator yoke (80) is respectively provided with a coil groove (81); the coil winding is arranged in the coil slot (81);
The stator magnet yoke (80) is distributed on the periphery of the rotor magnet yoke (70) by taking the axial lead of the rotor magnet yoke (70) as the center;
Stator yoke (80) are including base fixed plate (82) of central point, are close to the medial side of rotor yoke (70) at base fixed plate (82) and are connected with varus hem (83), keep away from the lateral side of rotor yoke (70) at base fixed plate (82) and be connected with valgus hem (84), base fixed plate (82), varus hem (83) and valgus hem (84) form foretell coil groove (81).
2. A continuous-zoom drive yoke set as claimed in claim 1, characterized in that the rotor yoke (70) is provided with a flap edge (71) near the end of the drum (2) rotationally connected to the housing (5).
3. The continuous-zoom driving yoke set as claimed in claim 2, wherein the turnup edge is perpendicular to the rotor yoke, and a plurality of magnetic pole engaging notches uniformly distributed circumferentially are provided on the turnup edge.
4. A continuous-zoom drive yoke set as claimed in claim 1, wherein the stator yoke (80) has four and the cavity is square, the stator yoke (80) being located at four corners of the cavity.
5. The continuous-zoom-drive yoke set as claimed in claim 1, wherein the inside-out flange (83) is a circular arc flange, the outside-out flange (84) is a flat flange, and a circumference of the inside-out flange (83) along a circumferential direction of the rotor yoke (70) is longer than a length of the outside-out flange (84) along the circumferential direction of the rotor yoke (70).
6. A continuous-zoom drive yoke set as claimed in claim 5, wherein the axis of the in-turned flange (83) coincides with the axis of the rotor yoke (70).
7. A method of assembling a continuous-zoom-drive yoke set, the method being for assembling the continuous-zoom-drive yoke set as claimed in any one of claims 1 to 6, the method comprising the steps of:
a1, sleeving a rotor magnetic yoke (70) on the outer wall of the rotary drum (2);
Stator yokes (80) are respectively arranged at a plurality of yoke setting positions of the base (1) close to one end face of the shell (5), and the stator yokes (80) are distributed on the same circumference;
a2, one end of the rotary drum (2) in the step a1 is rotatably connected with the shell (5);
a3, fixing the shell (5) in the step a2 at a shell setting position of the base (1), wherein stator yokes (80) fixed on the base (1) are distributed on the periphery of the rotor yokes (70) in the circumferential direction, and a space is formed between each stator yoke (80) and each rotor yoke (70), wherein the space is equal.
8. Lens driving apparatus characterized by having a continuous-zoom driving yoke set according to any one of claims 1 to 6.
9. An imaging device comprising the lens driving device according to claim 8.
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| CN202111035011.XA CN113777741B (en) | 2021-09-04 | 2021-09-04 | Continuous zoom driving yoke set, assembling method, lens driving device and image pickup device |
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| CN202111035011.XA CN113777741B (en) | 2021-09-04 | 2021-09-04 | Continuous zoom driving yoke set, assembling method, lens driving device and image pickup device |
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