CN113777741A - Continuous zoom drive yoke group, assembling method, lens drive device and image pickup device - Google Patents
Continuous zoom drive yoke group, assembling method, lens drive device and image pickup device Download PDFInfo
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- CN113777741A CN113777741A CN202111035011.XA CN202111035011A CN113777741A CN 113777741 A CN113777741 A CN 113777741A CN 202111035011 A CN202111035011 A CN 202111035011A CN 113777741 A CN113777741 A CN 113777741A
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- 238000000034 method Methods 0.000 title claims description 15
- 230000000750 progressive effect Effects 0.000 claims 4
- 230000003287 optical effect Effects 0.000 description 24
- 230000007246 mechanism Effects 0.000 description 12
- 230000004323 axial length Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- 230000000452 restraining effect Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002265 prevention Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- 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
Abstract
The invention relates to a continuous zooming driving magnetic yoke group. It has solved technical problem such as current with high costs. The continuous zooming driving magnetic yoke assembly comprises a rotary drum, a driving magnetic yoke and a driving magnetic yoke, wherein the rotary drum is arranged in the chamber, one axial end of the rotary drum is rotatably connected with a shell, and the other axial end of the rotary drum extends towards the base side and is in a free shape; the rotor magnetic yoke is cylindrical and is sleeved on the outer wall of the rotary drum; the rotor magnetic yoke is fixedly connected with the circumferential direction of the rotary drum; the stator magnetic yokes are provided with a plurality of magnetic yokes and are fixed on the base, and each stator magnetic yoke is provided with a coil groove; the stator magnetic yoke is distributed on the periphery of the rotor magnetic yoke by taking the axial lead of the rotor magnetic 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 group, an assembling method, a lens driving device and a camera device.
Background
The miniature camera long-focus lens is widely applied to high-end mobile phones, and the pixels of an applied image sensor 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 far exceeds the thickness of a mobile phone body. Although the periscopic motor is a mature solution for the mobile phone telephoto camera, the pixels are greatly increased, the outer diameter of the lens is also increased, and the application of the periscopic motor is limited. Therefore, the telescopic camera of the miniature lens cone can not only solve the problem that a long-focus lens with super-large pixels is arranged and used on a mobile phone, but also greatly improve the image quality.
The inventor utilizes the matching of the stator and the rotor to drive the bearing frame to focus in the axial direction of the optical axis (for example, chinese patent publication No. CN101595429B), which increases the focusing stroke, and the principle of this method 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 disadvantages of this approach are:
the stator and the rotor need longer matching stroke, so that the lengths of the stator magnetic yoke and the rotor magnetic yoke in the axial direction of the optical axis are longer, the length is longer, the cost is increased, the size of the final motor is increased, 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 driving yoke assembly, an assembling method, a lens driving device, and an image pickup device that can solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
this drive yoke group zooms in succession is located the cavity that base and shell formed, drive yoke group zooms in succession includes:
the rotating drum is arranged in the chamber, one axial end of the rotating drum is rotatably connected with the shell, and the rotating drum is axially fixed relative to the shell; the other axial end of the rotary drum extends to the base side and is free;
the rotor magnetic yoke is cylindrical and is sleeved on the outer wall of the rotary drum;
the rotor magnetic yoke is fixedly connected with the circumferential direction of the rotary drum;
the stator magnetic yokes are provided with a plurality of magnetic yokes and are fixed on the base, and each stator magnetic yoke is provided with a coil groove;
the stator magnetic yoke is distributed on the periphery of the rotor magnetic yoke by taking the axial lead of the rotor magnetic yoke as the center.
The bearing plays the effect of hanging in midair, makes the one end of rotary drum far away from the base be connected with the shell rotation, makes the one end of rotary drum near the base be free form. The structure can effectively reduce the manufacturing cost and improve the assembly efficiency, and simultaneously, can also meet the requirement of rotary driving.
In the above continuous zooming driving magnetic yoke group, one end of the rotor magnetic yoke, which is close to the rotary drum and is rotatably connected with the shell, is provided with a flanging edge.
In the above-described continuous zoom driving yoke assembly, the stator yoke has four and the cavity has a square shape, and the stator yoke is located at four corners of the cavity.
In the above-mentioned continuous zooming driving yoke group, the stator yoke includes a base fixing plate at a central position, an inward-turning hem is connected to an inner side edge of the base fixing plate close to the rotor yoke, an outward-turning hem is connected to an outer side edge of the base fixing plate far from the rotor yoke, and the base fixing plate, the inward-turning hem and the outward-turning hem form the above-mentioned coil slot.
In the continuous zooming driving magnet yoke group, the inward folded edge is an arc folded edge, the outward folded edge is a flat folded edge, and the circumference of the inward folded edge along the circumferential direction of the rotor magnet yoke is larger than the length of the outward folded edge along the circumferential direction of the rotor magnet yoke.
In the continuous zooming driving magnetic yoke group, the axial lead of the inward flanging coincides with the axial lead of the rotor magnetic yoke.
In the continuous zooming driving magnet yoke group, the inward-turning folded edge is vertical to the base fixing plate, the inner surface of the inward-turning folded edge, which is close to the rotor magnet yoke, is an arc concave surface, and the circle center of the arc concave surface is positioned on the axis of the rotor magnet yoke.
In the continuous zooming driving magnet yoke group, the outer surface of the inward-turning folded edge is a circular arc convex surface, and the circle center of the circular arc concave surface is coincided with the circle center of the circular arc convex surface.
In the continuous zooming driving magnet yoke group, the turning edge is vertical to the rotor magnet yoke, and a plurality of magnetic pole matching notches which are uniformly distributed in the circumference are arranged on the turning edge.
A method of assembling a continuous zoom driving yoke assembly, the method for assembling the continuous zoom driving yoke assembly, the method comprising the steps of:
a1, sleeving a rotor magnetic yoke on the outer wall of the rotary drum;
stator magnetic yokes are respectively installed at the set positions of a plurality of magnetic yokes on one end face, close to the shell, of the base, and the stator magnetic yokes are distributed on the same circumferential line;
a2, rotatably connecting one end of the rotary drum in the step a1 to the shell;
a3, fixing the shell in the step a2 at the set position of the shell of the base, distributing the stator magnetic yokes fixed on the base on the periphery of the rotor magnetic yokes, and forming a space between each stator magnetic yoke and each rotor magnetic yoke, wherein the spaces are 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 with the camera device.
Compared with the prior art, the invention has the advantages that:
its axial of rotary drum is fixed and can rotate for the base, and it has shortened the yoke of stator and rotor at the axial length of optical axis by a wide margin under this kind of prerequisite, and it can reduce lens drive arrangement's optical axis axial length this kind of design, just also can be applied to thinner or ultra-thin camera terminal.
The split design of the stator yoke can greatly reduce the manufacturing cost and reduce the radial size of the lens driving device.
Each stator yoke is provided with a coil groove, so that the stator yoke can be manufactured in a standardized mode, the precision is controllable, coils are built in the stator yoke, the coils can be protected, and the final assembly efficiency and assembly precision are guaranteed.
The mode that the rotary drum rotates and is axially and relatively fixed is utilized, the rotor magnetic yoke can be prevented from being exposed out of the shell, the service life of the rotor magnetic yoke is prolonged, and the driving matching stability of the rotor and the stator is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a lens driving device provided by the present invention.
Fig. 2 is a schematic sectional view of fig. 1 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 the lens driving apparatus according to the present invention.
Fig. 5 is a schematic structural diagram of a housing of a lens driving apparatus according to the present invention.
FIG. 6 is a schematic view of the drum structure of the lens driving device of the present invention.
Fig. 7 is a schematic structural diagram of an image pickup apparatus provided by the present invention.
Fig. 8 is a schematic structural diagram of an electronic device provided in the present invention.
Fig. 9 is a schematic sectional view taken along line C-C in fig. 1.
Fig. 10 is a schematic structural diagram of a magnetic yoke assembly provided by the invention.
In the figure, a base 1, a rotary drum 2, an internal thread 20, an external bearing fixing step 21, a telescopic lens barrel 3, an external thread 30, a constraint mechanism 4, a front constraint hole 40, a constraint polished rod 41, a constraint reinforcing ring 42, an inner ring groove 420, a rear constraint hole 43, a sub-constraint through hole 430, a shell 5, a bearing fixing part 50, an internal bearing fixing step 500, a shielding part 51, a bearing 6, a rotor yoke 70, a turned edge 71, a magnetic pole matching gap 72, a stator yoke 80, a coil slot 81, a base fixing plate 82, an internal turned edge 83 and an external turned edge 84.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 4 and 9 to 10, the lens driving apparatus includes a continuous zoom driving yoke set, specifically, the continuous zoom driving yoke set of the present embodiment, which includes the drum 2, the rotor yoke 70, and the stator yoke 80, is located in a chamber formed by the base 1 and the housing 5.
The rotary drum 2 is arranged in the chamber, one axial end of the rotary drum 2 is rotatably 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 in a free shape;
its axial of rotary drum is fixed and can rotate for the base, and its length of rotary drum shortens by a wide margin under this kind of prerequisite, and simultaneously, rotor yoke and stator yoke shorten by a wide margin at the axial length of optical axis, and it can reduce lens drive arrangement's optical axis axial length this kind of design, just also can be applied to thinner or ultra-thin camera terminal.
The rotor yoke 70 is cylindrical and is sleeved on the outer wall of the rotary drum 2; the rotor yoke 70 is fixedly connected with the circumferential direction of the rotary drum 2; the circumferentially fixed connection may be by interference fit or the like.
Preferably, an end surface of the rotor yoke 70 close to the base 1 of the present embodiment is flush with an end surface of the drum close to the base 1. While the axial length of the rotor yoke 70 is smaller than the axial length of the rotor drum 2, the remaining length being used for mounting the bearings.
A plurality of stator magnetic yokes 80 are fixed on the base 1, and each stator magnetic yoke is provided with a coil groove 81; the plurality of stator yokes 80 can greatly reduce the processing cost and the processing difficulty of the stator yokes. Secondly, it can be used for installing the coil winding in the coil groove 81 that sets up, and at the in-process of equipment, it can protect the coil to stator yoke 80, avoids the coil frequent contact to lead to the damage and the electric leakage, perhaps leads to coil deformation even damage, influences equipment and follow-up use.
The stator yoke 80 is distributed around the circumference of the rotor yoke 70 with the axial line of the rotor yoke 70 as the center. Preferably, the stator yoke 80 of the present embodiment has four and the cavity has a square shape, and the stator yoke 80 is located at four corners of the cavity. The spare space at the corner of the cavity is fully utilized to mount the stator magnet yoke, so that the whole structure is more compact, and the radial size of the shell can be greatly reduced, thereby meeting the development requirement of a miniature motor.
Secondly, each corner of the cavity is used for positioning the stator magnet yoke, so that the assembly efficiency can be improved, and the assembly accuracy is ensured.
The rotor yoke 70 is provided with a folded edge 71 near one end of the rotary drum 2 rotatably connected with the housing 5. The turned edge is perpendicular to the magnetic yoke of the rotor, and a plurality of magnetic pole matching notches 72 which are evenly distributed on the circumference are arranged on the turned 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 abutted against the turnover edge 71.
The rotor magnet ring of this embodiment is an integral ring or a plurality of tile-like magnet segments circumferentially distributed around the rotor yoke 70. When a tile-like magnet block is selected, the gap between adjacent blocks is aligned with the pole-fitting notch 72.
Specifically, each stator yoke 80 of the present embodiment includes a base fixing plate 82 at a central position, the base fixing plate 82 is fixed on the base 1, when the base fixing plate 82 is fixed, a jig or a preset limit preset on the base 1 is used for positioning, an inward folded edge 83 is connected to an inner side edge of the base fixing plate 82 close to the rotor yoke 70, an outward folded edge 84 is connected to an outer side edge of the base fixing plate 82 far from the rotor yoke 70, and the base fixing plate 82, the inward folded edge 83, and the outward folded edge 84 form the coil slot 81.
The inward turned flaps 83 and the outward turned flaps 84 are perpendicular to the base fixing plate 82, respectively.
The spacing between the inward flanging edge 83 and the flanging edge 71 is reserved to avoid the contact to cause abrasion damage to the stator and the rotor.
Preferably, the inward turned-over edge 83 of the present embodiment is a circular arc turned-over edge, the outward turned-over edge 84 is a flat plate turned-over edge, and the circumference of the inward turned-over edge 83 along the circumferential direction of the rotor yoke 70 is greater than the length of the outward turned-over edge 84 along the circumferential direction of the rotor yoke 70. The inward-turned flange 83 has a longer circumferential length along the circumferential direction of the rotor yoke 70, and can guide the magnetic lines of force generated after the coil is energized to be transmitted to the rotor magnet ring inwards, so that the driving purpose is achieved.
The axial line of the inward turned flange 83 coincides with the axial line of the rotor yoke 70. Ensuring the rotational stability of the rotor.
Further, the inward-turned flange of the embodiment is perpendicular to the base fixing plate, the inner surface of the inward-turned flange close to the rotor magnetic yoke is an arc concave surface, and the center of the arc concave surface is located on the axis of the rotor magnetic yoke.
In the continuous zooming driving magnet yoke group, the outer surface of the inward-turning folded edge is a circular arc convex surface, and the circle center of the circular arc concave surface is coincided with the circle center of the circular arc convex surface.
The assembling method of the continuous zooming driving magnetic yoke group comprises the following steps:
a1, sleeving the rotor yoke 70 on the outer wall of the rotary drum 2;
stator magnetic yokes 80 are respectively installed at a plurality of magnetic yoke set positions of the base 1 close to one end face of the shell 5, and the stator magnetic yokes 80 are distributed on the same circumferential line;
a2, rotatably connecting one end of the rotary drum 2 in the step a1 to the shell 5;
a3, fixing the shell 5 in the step a2 at the set position of the shell of the base 1, distributing the stator yokes 80 fixed on the base 1 on the periphery of the rotor yoke 70, and forming a space between each stator yoke 80 and the rotor yoke 70, wherein the spaces are equal.
As shown in fig. 1-3, the lens driving device further includes a retractable lens barrel 3, a constraint mechanism 4, a transmission mechanism and a bearing 6, and the base 1 is in a shape of a ring 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 relative to the base 1 and the drum 2 is fixed relative to the axial housing and the base 1, i.e. in the axial direction of the optical axis, the axial direction of the drum 2 does not move. Further, the end of the drum 2 away from the base 1 is rotatably connected to the housing 5, and specifically, the bearing 6 is connected to the housing 5 and the drum 2, and the bearing 6 enables the drum 2 to rotate around the optical axis.
Further, a bearing fixing portion 50 having an inner bearing fixing step 500 is disposed 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 circumferential end surface of the outer ring of the bearing 6 is fixed to the upper circumferential 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 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, and 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 the inner ring may be similarly fixed with glue to reinforce the strength of the inner ring fixed 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 surround to form a bearing accommodating annular space.
In addition, one end face of the rotary drum 2, which is far away from the base 1, is positioned above one end face of the inner ring of the bearing 6, which is far away from the base 1, so that the bearing inner ring can be fixed firmly in an uneven mode.
Preferably, the bearing fixing portion 50 of the present embodiment protrudes from the top of the housing 5. The top of the bearing fixing portion 50 away from the housing 5 is connected to a shielding portion 51 which is sleeved on the periphery of the retractable lens barrel 3 and shields the upper side of one end face of the drum 2 away from the base 1. The shielding part 51 plays the roles 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 to form an integral structure, that is, the housing 5, the bearing fixing portion 50 and the shielding portion 51 are made of the same material, and then the bearing fixing portion 50 and the shielding portion 51 are formed by stamping or other methods.
The telescopic lens cone 3 is used for bearing lenses, one end of the telescopic lens cone 3 is sleeved with the rotary drum 2, and the other end of the telescopic lens cone 3 is far away from the base 1. Preferably, the axis of the rotating drum 2 and the axis of the telescopic lens barrel 3 of the present embodiment coincide, and the axis coincides with the optical axis a, so as to achieve focusing accuracy and subsequent image pickup quality.
The restraint mechanism 4 is connected with the base 1 and the telescopic lens cone 3; the constraint mechanism 4 enables the telescopic lens barrel 3 to be locked relative to the base 1 in the circumferential direction, and the constraint mechanism 4 enables the axis line of the telescopic lens barrel 3 to be coincident with the optical axis, wherein the optical axis is the optical axis of incident light.
The transmission structure is arranged between the rotary drum 2 and one end of the telescopic lens cone 3 which is sleeved; the transmission structure is used to transmit a rotational driving force to the telescopic lens barrel 3 to force the telescopic lens barrel 3 to move in the optical axis axial direction when the drum 2 rotates.
In this embodiment, the cooperative action of the transmission structure and the constraint mechanism 4 is utilized, and the retractable lens barrel 3 can move in the axial direction of the optical axis under the driving of the rotational driving force, so that the axial lead of the retractable lens barrel 3 bearing the lens can be always coincided with the optical axis, and the image pickup quality is greatly improved on the premise of meeting the requirement of large-stroke focusing. Secondly, with the design of the outer barrel 2 and the inner telescopic cone 3, the manufacturing and processing difficulty and the manufacturing cost are reduced.
Also, the axial direction of the rotary drum 2 of the present embodiment is fixed relative to the base 1, and on the premise that the length of the rotary drum 2 is greatly shortened, the design can reduce the axial length of the optical axis of the lens driving device, and can also be applied to a thinner or ultra-thin camera terminal.
Preferably, the transmission structure of the present embodiment is a screw 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 arranged in the telescopic lens barrel 3 from contacting with one end face of the rotary drum 2 close to the telescopic lens barrel 3, and meanwhile, the distribution and the assembly of the restraint mechanism can be facilitated.
The length of the internal thread 20 is longer than the length of the external thread 30.
That is, all establish the internal thread at the inner wall of rotary drum 2, be equipped with external screw thread 30 near the one end of base 1 at the outer wall of retractable lens cone 3, the outer wall that retractable lens cone 3 is the remaining does not have the external screw thread and the outer wall diameter that retractable lens cone 3 does not have the external screw thread is less than the end footpath of external screw thread to and can make rotary drum 2 place in the shell and rotate with the shell and be connected, and retractable lens cone 3 can stretch out the shell and accomodate in rotary drum 2, thereby play better dustproof and waterproof effect. The shielding portion 51 is fitted over the outer wall of the retractable lens barrel 3 without external threads.
Preferably, as shown in fig. 2 and 4, the constraining mechanism 4 of the present embodiment includes a plurality of front constraining holes 40 disposed on the wall thickness of the telescopic lens barrel 3 and distributed circumferentially, the number of the front constraining holes 40 is 2-4 and distributed circumferentially and uniformly, the front constraining holes 40 are parallel to the axial line of the telescopic lens barrel 3, the constraining mechanism 4 further includes a plurality of constraining polished rods 41 located in the rotating cylinder 2, one end of the constraining polished rod 41 is fixed on the base 1, and the other ends of the constraining polished rods 41 are inserted into the corresponding front constraining holes 40 one by one.
The front restraining 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 restraining hole 40 has excellent radial deformation resistance and is convenient to process and manufacture.
The front restraint holes 40 distributed circumferentially can restrain the position of the restraint polished rod 41, and also can restrain the axial position of the telescopic lens barrel 3. The front restraining hole 40 and the restraining polish rod 41 are in slight clearance fit.
Next, the front constraining hole 40 of the present embodiment is a blind hole, and the opening of the front constraining hole 40 faces the base 1. The blind hole can limit the focusing limit position, and can also achieve the purposes of dust prevention and the like.
In addition, a fixing groove and a restraint reinforcing ring 42 fixed in the fixing groove are arranged at one end of the inner wall of the telescopic lens barrel 3 close to the orifice of the front restraint hole 40, a plurality of rear restraint holes 43 are arranged on the restraint reinforcing ring 42, the number of the rear restraint holes 43 is equal to that of the front restraint holes 40, and one front restraint hole 40 is communicated with one rear restraint hole 43.
The axis of the front constraining hole 40 coincides with the axis of the rear constraining hole 43, so that the axis of the constraining-reinforcing ring 42 coincides with the optical axis to have a very high degree of coincidence of the optical axes. The restraining reinforcing ring 42 is used for reinforcing the radial strength of a section provided with external threads, and can restrain the restraining polished rod 41 at different positions.
An inner ring groove 420 is formed in 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 sequentially distributed along the axial direction of the optical axis and are mutually communicated by the inner ring groove 420, and the constraint polished 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 constrained polish rod 41 to reduce the focusing resistance, improve the efficiency, and facilitate the installation and fixation of the lens.
The inner wall of the restraint reinforcement ring 42 and the inner wall of the telescopic lens barrel 3 are equal or slightly smaller than the inner wall of the telescopic lens barrel 3.
One end face of the restraint reinforcing ring 42 close to the base 1 is flush with one end face of the telescopic lens barrel 3 close to the base 1.
One sub-restriction through hole 430 always performs radial position restriction on the restriction polished rod 41, in addition, one end of the restriction strengthening ring 42 close to the front restriction hole 40 can form radial reinforcement on the opening of the front restriction hole 40 to prevent the hole deformation of the front restriction hole 40 from causing the restriction polished rod 41 to be incapable of being inserted for focusing adjustment, and the other end of the restriction strengthening ring 42 far away from the front restriction hole 40 is used for forming radial reinforcement on the inner wall of one end of the telescopic lens barrel 3 close to the base.
Secondly, an arc convex surface is arranged at one end of the restraining polished rod 41 far away from the base 1, and the structure can play a role in guiding.
The constraining reinforcement ring 42 of the present embodiment is formed in two ways:
first, the restraint reinforcement ring 42 is a unitary structure;
second, the constraint reinforcement ring 42 includes an L-shaped portion and a base portion located at one vertical end of the L-shaped portion such that the L-shaped portion and the base portion surround to form an inner ring groove 420.
The working principle of the embodiment is as follows:
the rotary drum 2 rotates relative to the base 1 and the shell 5 under the drive of the rotation drive power;
the inner thread of the inner wall of the rotary drum 2, the outer thread of the outer wall of the telescopic lens cone 3 and the restraint mechanism 4 cooperate to push the telescopic lens cone 3 to move in the axial direction of the optical axis.
The rotor is arranged on the rotary drum, so that the rotor can be driven to move around the optical axis by the driving force generated by the stator coil assembly and the rotor, the axial length of the stator and the rotor in the optical axis can be greatly reduced under the condition of meeting the driving requirement, and the manufacturing cost of the rotor and the stator is greatly reduced.
As another mode, the restraint mechanism 4 includes a strip-shaped groove which is arranged on the outer wall of the telescopic lens cone 3 and axially distributed along the telescopic lens cone 3, and strip-shaped protrusions which are clamped in the strip-shaped groove one by one are arranged at the top of the outer shell. In this way, the telescopic lens barrel can move in the axial direction of the optical axis.
Example two
As shown in fig. 3, the present lens driving apparatus has the continuous zoom driving yoke assembly described in the first embodiment.
EXAMPLE III
As shown in fig. 7, the present imaging apparatus includes the lens driving apparatus according to the second embodiment, and a lens is mounted on the lens driving apparatus.
Example four
As shown in fig. 8, the present electronic apparatus has the image pickup device according to the third embodiment. Electronic devices such as: cell phones, tablets, computers, and the like.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A continuous zoom drive yoke assembly located within a chamber formed by the base (1) and the housing (5), characterized in that the continuous zoom drive yoke assembly comprises:
the rotary drum (2) is arranged in the chamber, one axial end of the rotary drum is rotationally connected with the shell (5), and the rotary drum (2) is axially fixed relative to the shell (5);
the rotor magnetic yoke (70) is cylindrical and is sleeved on the outer wall of the rotary drum (2);
the rotor magnetic yoke (70) is fixedly connected with the circumferential direction of the rotary drum (2);
a plurality of stator magnetic yokes (80) which are fixed on the base (1), wherein each stator magnetic yoke (80) is provided with a coil groove (81) respectively;
the stator magnetic yoke (80) is distributed on the periphery of the rotor magnetic yoke (70) in the circumferential direction by taking the axial lead of the rotor magnetic yoke (70) as the center.
2. A progressive zoom drive yoke set as claimed in claim 1, characterised in that the rotor yoke (70) is provided with a flanging (71) near the end of the drum (2) to which the housing (5) is rotatably connected.
3. The progressive zoom drive yoke set of claim 2 wherein the flange is perpendicular to the rotor yoke and a plurality of circumferentially evenly distributed pole engaging notches are provided in the flange.
4. A progressive 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 the four corners of the cavity.
5. A progressive zoom drive yoke assembly as claimed in claim 1, characterised in that the stator yoke (80) comprises a centrally located base fixing plate (82), that an inside flanging (83) is connected to the base fixing plate (82) at an inner side thereof close to the rotor yoke (70), that an outside flanging (84) is connected to the base fixing plate (82) at an outer side thereof remote from the rotor yoke (70), and that the base fixing plate (82), the inside flanging (83) and the outside flanging (84) form the coil slot (81).
6. Continuous zoom drive yoke assembly as claimed in claim 5, characterized in that the inward turned-over edge (83) is a circular arc turned-over edge, the outward turned-over edge (84) is a flat plate turned-over edge, and the circumference of the inward turned-over edge (83) along the circumferential direction of the rotor yoke (70) is larger than the length of the outward turned-over edge (84) along the circumferential direction of the rotor yoke (70).
7. Continuous zoom drive yoke set as claimed in claim 6, characterized in that the axis of the inside folded edge (83) coincides with the axis of the rotor yoke (70).
8. A method of assembling a continuous zoom driving yoke assembly, the method being used for assembling the continuous zoom driving yoke assembly according to any one of claims 1 to 7, characterized in that the assembling method comprises the steps of:
a1, sleeving a rotor yoke (70) on the outer wall of the rotary drum (2);
stator magnetic yokes (80) are respectively installed at a plurality of magnetic yoke set positions on one end face, close to the shell (5), of the base (1), and the stator magnetic yokes (80) are distributed on the same circumferential line;
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 the set position of the shell of the base (1), distributing the stator yokes (80) fixed on the base (1) on the periphery of the rotor yoke (70), and forming a space between each stator yoke (80) and the rotor yoke (70), wherein the spaces are equal.
9. Lens driving apparatus, characterized in that it has a continuous zoom driving yoke set according to any one of claims 1-7.
10. An image pickup apparatus comprising the lens driving apparatus according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111035011.XA CN113777741A (en) | 2021-09-04 | 2021-09-04 | Continuous zoom drive yoke group, assembling method, lens drive device and image pickup device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111035011.XA CN113777741A (en) | 2021-09-04 | 2021-09-04 | Continuous zoom drive yoke group, assembling method, lens drive device and image pickup device |
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| CN113777741A true CN113777741A (en) | 2021-12-10 |
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| CN202111035011.XA Pending CN113777741A (en) | 2021-09-04 | 2021-09-04 | Continuous zoom drive yoke group, assembling method, lens drive device and image pickup device |
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