CN113467038A - Drum driving mechanism and method for lens driving device, and image pickup apparatus - Google Patents
Drum driving mechanism and method for lens driving device, and image pickup apparatus Download PDFInfo
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- CN113467038A CN113467038A CN202111034678.8A CN202111034678A CN113467038A CN 113467038 A CN113467038 A CN 113467038A CN 202111034678 A CN202111034678 A CN 202111034678A CN 113467038 A CN113467038 A CN 113467038A
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- rotor
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- shell
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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
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
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- 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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The present invention relates to a drum driving mechanism of a lens driving apparatus. The stator solves the technical problems of high cost and the like of the existing stator and rotor. The rotary drum driving mechanism of the lens driving device comprises a shell, wherein a rotary drum is arranged in the shell; the rotary connecting mechanism is connected between the top of the shell and one end of the rotary drum close to the top of the shell, and enables the rotary drum to rotate around the optical axis and also enables the rotary drum to be axially fixed relative to the top of the shell; the rotor is sleeved on the outer wall of the rotary drum and is fixedly connected with the rotary drum in the circumferential direction; the stator coil assemblies are arranged on the periphery of the outer circumference of the rotor uniformly, and the rotor is subjected to stable torque by electromagnetic force generated after the stator coil assemblies are electrified in turn, so that the rotor is driven to rotate around the optical axis. The invention has the advantages that: the relative position of the stator and the rotor is inconvenient to fix, the cost is reduced, and the image pick-up definition is improved.
Description
Technical Field
The invention belongs to the technical field of camera motors, and particularly relates to a rotary drum driving mechanism and method of a lens driving device, the lens driving device and a camera device.
Background
The image pickup apparatus is generally applied to an image pickup motor, which has a focusing function. The existing camera motor structurally comprises a lens barrel for bearing a lens, wherein the lens barrel moves in the axial direction of an optical axis in an electromagnetic driving mode, and the focusing stroke of the mode is short. The inventor improves the above, and the lens barrel is driven to focus in the axial direction of the optical axis by matching the stator and the rotor (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, the stator and the bearing frame are in threaded connection, the stator and the bearing frame are driven to focus in the axial direction of the optical axis by adopting threaded connection, although the stator has the advantages, the rotor of the motor needs larger driving force due to the fact that the rotor of the motor moves along with the axial rotation of the optical axis, the cost of a stator coil winding is increased due to the large driving force, meanwhile, the radial occupied space of the coil winding is increased, the size of the motor at the moment is enlarged, and the motor is not beneficial to the microminiaturization development trend of the motor.
Secondly, the coincidence degree of the axial lead and the optical axis of the lens carried by the rotor is poor, and the final image pick-up definition is influenced.
In addition, the rotor rotates along with the lens, and the stator and the rotor need a longer matching stroke, which inevitably results in an increase in driving cost, and when the stator is longer or the motor has a larger size in the axial direction of the optical axis, the motor is not favorable for the development trend of microminiaturization.
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 drum driving mechanism and method for a lens driving device, and an imaging device, which can solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the drum driving mechanism of the lens driving device comprises a housing;
a drum built in the housing;
the rotary connecting mechanism is connected between the top of the shell and one end of the rotary drum close to the top of the shell, and enables the rotary drum to rotate around the optical axis and also enables the rotary drum to be axially fixed relative to the top of the shell;
the rotor is sleeved on the outer wall of the rotary drum and is fixedly connected with the rotary drum in the circumferential direction;
the stator coil assemblies are uniformly distributed on the periphery of the outer circumference of the rotor, and the rotor is subjected to stable torque by electromagnetic force generated after the stator coil assemblies are electrified in turn so as to drive the rotary drum to rotate around the optical axis.
In the above-described drum drive mechanism of the lens drive device, the rotor includes:
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;
and the rotor magnet ring is fixed on the outer wall of the rotor magnet yoke.
In the drum driving mechanism of the lens driving device, one end of the rotor magnetic yoke, which is close to the rotary drum and is rotationally connected with the housing, is provided with a flanging edge, and one axial end of the rotor magnet ring is abutted against the flanging edge.
In the above-described drum driving mechanism of the lens driving device, each stator coil assembly includes a stator yoke having a coil slot having a notch facing the top of the housing, and a coil located in the coil slot is mounted on the stator yoke.
In the drum driving mechanism of the lens driving device, the stator yoke includes a base fixing plate at a central position, an inward-turning folded edge is connected to an inner side of the base fixing plate close to the rotor yoke, an outward-turning folded edge is connected to an outer side of the base fixing plate far from the rotor yoke, and the base fixing plate, the inward-turning folded edge and the outward-turning folded edge form the stator yoke with the coil slot.
In the drum driving mechanism of the lens driving device, the inward folded edge is an arc folded edge, the outward folded edge is a flat folded edge, and the axial lead of the inward folded edge is superposed on the optical axis.
In the above-described drum driving mechanism of the lens driving device, the rotary coupling mechanism includes:
the bearing fixing part is connected with the top of the shell and protrudes out of the top of the shell;
one end of the rotary drum close to the top of the shell extends into the bearing fixing part;
and the bearing is arranged between the bearing fixing part and one end of the rotary drum extending into the bearing fixing part, the axial lead of the rotary drum is coincided with the optical axis by the bearing, the rotary drum can rotate relative to the shell, and the axial direction of the rotary drum is fixed relative to the shell.
In the above-described drum driving mechanism of the lens driving device, the rotary coupling mechanism further includes:
and the shielding part is connected to the bearing fixing part and shields the outer side of one end of the rotary drum extending into the bearing fixing part.
In the drum driving mechanism of the lens driving device, the housing is fixed to the base, the drum, the stator coil assembly and the rotor are disposed in a chamber formed by the housing and the base, the chamber has a square shape, and the stator coil assembly has four sets and is located at four corners of the chamber.
The drum driving method includes the steps of:
b1, the stator coil assemblies fixed relative to the outer circumference of the rotor are electrified in sequence, and the electrifying sequence is any one of the anticlockwise direction and the clockwise direction;
b2, the stator coil assembly is electrified to generate electromagnetic force to make the rotor receive stable torque to drive the rotary drum to rotate around the optical axis, and the axial direction of the rotary drum is fixed relative to the shell.
The invention also provides a lens driving device, and a rotary drum driving mechanism with the lens driving device.
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:
the rotary drum is arranged in the shell, so that the stator and the rotor can be protected, and the service life of the driving mechanism is prolonged.
The rotary connecting mechanism enables the rotary drum to rotate around the optical axis and enables the rotary drum to be axially fixed relative to the top of the shell, so that the stability of the rotary drum rotating around the optical axis is ensured, meanwhile, the concentricity of the axial lead of the rotary drum and the optical axis is very good, and the final shooting definition is ensured. And in this way it is possible to greatly reduce the focus driving force.
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.
The stator coil assemblies are uniformly distributed on the outer circumference of the rotor, and the rotor is subjected to stable torque by the electromagnetic force generated after the stator coil assemblies are electrified in turn so as to drive the rotary drum to rotate around the optical axis.
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.
Fig. 11 is a schematic view of the structure of the housing provided by the present invention.
Fig. 12 is a schematic view of another rotor magnet ring structure according to the present 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 7, a rotor yoke 70, a flanging edge 71, a magnetic pole matching gap 72, a stator coil assembly 8, a stator yoke 80, a coil groove 81, a base fixing plate 82, an internal flanging edge 83 and an external flanging 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. 1 and 2, the lens driving apparatus includes a drum driving mechanism of the lens driving apparatus, which includes a drum 2, a rotary connection mechanism, a housing 5, a rotor 7, and a stator coil assembly 8.
The bowl 2 of the present embodiment is built into the housing 5.
The rotary connecting mechanism is connected between the top of the shell 5 and one end of the rotary drum 2 close to the top of the shell, and enables the rotary drum to rotate around the optical axis and also enables the rotary drum to be axially fixed relative to the top of the shell;
the rotor 7 is sleeved on the outer wall of the rotary drum and is fixedly connected with the rotary drum in the circumferential direction;
the stator coil assemblies 8 are arranged on the periphery of the outer circumference of the rotor uniformly, and the rotor is subjected to stable torque by electromagnetic force generated after the stator coil assemblies are electrified in turn, so that the rotor is driven to rotate around the optical axis.
Specifically, as shown in fig. 4 and 9 to 10, the rotor 7 of the present embodiment includes a rotor yoke 70 and a rotor magnet ring 73, and the stator coil assembly 8 includes a stator yoke 80 and a coil 85.
The rotary drum 2 is arranged in a chamber formed by the base and the shell, one axial end of the rotary drum 2 is rotationally connected with the shell 5, and the other axial end of the rotary drum 2 extends towards the base 1 side and is free;
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 stator yoke 80 of the present embodiment has a U-shape.
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 73 is assembled, the rotor magnet ring is sleeved on the outer wall of the rotor magnet yoke 70, meanwhile, one end of the rotor magnet ring is abutted against the turnover edge 71, and the other end of the rotor magnet ring is flush with one end of the rotary drum 2 far away from the top of the shell.
As shown in fig. 4 and 12, the rotor magnet ring of the present embodiment is an integrated ring or a plurality of tile-shaped magnet pieces distributed circumferentially around the rotor yoke 70. When tile-shaped magnet blocks are selected, the gap between adjacent blocks is aligned with the pole-fitting notch 72 to improve the assembly efficiency.
Specifically, as shown in fig. 4 and fig. 9 to fig. 10, 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, the base fixing plate 82 is fixed by using a jig or a preset limit position preset on the base 1 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 stator yoke 80 having 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 stator yoke is provided with a coil 85 positioned in the coil slot, and the inward turned flange 83 has a longer circumferential length along the circumference of the rotor yoke 70 and can guide the magnetic force lines of the energized coil 85 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. 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 that of the circular arc convex surface.
The axial lead of the inward-turned edge is coincided with the optical axis, the rotary drum, the stator coil assembly and the rotor are arranged in a cavity formed by the shell and the base, the cavity is square, and the stator coil assembly 8 has four groups and is positioned at four corners of the cavity. In this way, the space of the four corners of the housing is utilized as much as possible to accommodate the stator coil group, and compared with the annular coil, the space occupied by the housing in the radial direction is greatly reduced.
The assembling method of the magnetic yoke 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.
The coils are already fixed in the coil slots of the stator yoke 80 before the stator yoke 80 is assembled.
Similarly, the stator magnet ring is also assembled to the outer wall of the rotor yoke 70.
The drum driving method includes the steps of:
b1, the stator coil assemblies fixed relative to the outer circumference of the rotor are electrified in sequence, and the electrifying sequence is any one of the anticlockwise direction and the clockwise direction;
b2, the stator coil assembly is electrified to generate electromagnetic force to make the rotor receive stable torque to drive the rotary drum to rotate around the optical axis, and the axial direction of the rotary drum is fixed relative to the shell.
As shown in fig. 1-3, the lens driving device further includes a retractable lens barrel 3, a constraint mechanism 4 and a transmission structure, 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.
The rotary connection mechanism of the present embodiment includes a bearing 6.
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 between the housing 5 and the end of the drum 2 away from the base 1, and the bearing 6 enables the drum 2 to rotate around the optical axis.
Further, as shown in fig. 1-3 and 11, a bearing fixing portion 50 having an inner bearing fixing step 500 is disposed at the top of the housing 5, the bearing fixing portion 50 is annular, 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 extending into the bearing fixing portion 50.
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 on an outer wall of an end of the drum 2 extending into the bearing fixing portion 50, and an inner ring of the bearing 6 is fixed to the outer bearing fixing step 21, and similarly, an inner circumferential surface and a lower circular end surface of the inner ring of the bearing 6 are respectively fixed to a circumferential surface and a lower circular surface of the outer bearing fixing step 21, and glue may be provided 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 outer side of one end face of the rotary drum 2 away from the base 1. The shielding part 51 is annular, and the shielding part 51 plays the roles of dust prevention, water prevention and the like, so that the service life of the bearing can be prolonged.
Specifically, the bearing fixing portion of this embodiment includes a first circular portion 501 vertically connected to the top of the housing, and a second circular portion 502 vertically connected to the first circular portion is connected to the top end of the first circular portion, and the inner diameter of the second circular portion is smaller than the inner diameter of the first circular portion.
The first and second annular portions form a bearing fixing portion 50 having an inner bearing fixing step 500.
Secondly, the shielding part comprises a third circular part 510 vertically connected with the second circular part, the inner diameter of the third circular part is smaller than that of the second circular part, a fourth circular part 511 vertically connected with the third circular part is connected to the inner side of the third circular part, and the inner diameter of the fourth circular part is smaller than that of the third circular part. The inner diameter of the fourth circular part is smaller than the inner diameter of the rotary drum.
The second circular part and the fourth circular part are distributed in parallel, and the fourth circular part is positioned above the inner side of the second circular part. The structure can be convenient to process and manufacture.
The housing 5 is any one of a square housing and a rectangular housing.
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 axial lead of the bearing fixing part 50 is coincided with the axial lead of the shielding part 51, the axial lead of the bearing fixing part 50 is coincided with the axial lead of the shell, and the axial lead is coincided with the optical axis.
The telescopic lens cone 3 is used for bearing lenses, one end of the telescopic lens cone 3 is sleeved with one end, away from the base 1, of the rotary drum 2, and the other end of the telescopic lens cone 3 is 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 surface 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 this embodiment includes a plurality of constraining holes that are circumferentially distributed on the wall thickness of the telescopic lens barrel 3, the number of the constraining holes is 2-4 and circumferentially and uniformly distributed, the constraining holes are parallel to the axial line of the telescopic lens barrel 3, the constraining mechanism 4 further includes a plurality of constraining polish rods 41 that are located inside the rotating drum 2, one end of the constraining polish rod 41 is fixed on the base 1, and the other ends of the constraining polish rods 41 are inserted into the corresponding constraining holes one by one.
Specifically, each of the restraining apertures includes a front restraining aperture 40 and a rear restraining aperture 43.
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 is arranged at one end of the inner wall of the telescopic lens barrel 3 close to the opening of the front restriction hole 40, and a restriction strengthening ring 42 fixed in the fixing groove is arranged, a plurality of rear restriction holes 43 are arranged on the restriction strengthening ring 42, the number of the rear restriction holes 43 is equal to that of the front restriction holes 40, and one front restriction hole 40 is communicated with one rear restriction 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.
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 drum driving mechanism of the lens driving apparatus 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 (12)
1. Lens drive arrangement's rotary drum actuating mechanism, including the shell, its characterized in that, lens drive arrangement's rotary drum actuating mechanism still includes:
a drum built in the housing;
the rotary connecting mechanism is connected between the top of the shell and one end of the rotary drum close to the top of the shell, and enables the rotary drum to rotate around the optical axis and also enables the rotary drum to be axially fixed relative to the top of the shell;
the rotor is sleeved on the outer wall of the rotary drum and is fixedly connected with the rotary drum in the circumferential direction;
the stator coil assemblies are uniformly distributed on the periphery of the outer circumference of the rotor, and the rotor is subjected to stable torque by electromagnetic force generated after the stator coil assemblies are electrified in turn so as to drive the rotary drum to rotate around the optical axis.
2. The drum drive mechanism of the lens drive apparatus according to claim 1, wherein the rotor comprises:
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;
and the rotor magnet ring is fixed on the outer wall of the rotor magnet yoke.
3. The drum driving mechanism of the lens driving device as claimed in claim 2, wherein the rotor yoke has a flange at an end thereof adjacent to the rotational connection of the drum and the housing, and an axial end of the rotor magnet ring abuts against the flange.
4. The drum driving mechanism of the lens driving device according to claim 1, wherein each of the stator coil assemblies includes a stator yoke having a coil slot having a notch facing a top of the housing, and a coil located in the coil slot is mounted on the stator yoke.
5. The drum driving mechanism of the lens driving unit as claimed in claim 4, wherein the stator yoke comprises a centrally positioned base fixing plate, an inward flange is connected to an inner side of the base fixing plate adjacent to the rotor yoke, and an outward flange is connected to an outer side of the base fixing plate remote from the rotor yoke, and the base fixing plate, the inward flange and the outward flange form the stator yoke having the coil slots.
6. The drum driving mechanism of the lens driving device as claimed in claim 5, wherein the inward turned flange is a circular arc turned flange, the outward turned flange is a flat plate turned flange, and the axial center lines of the inward turned flange coincide with the optical axis.
7. The drum driving mechanism of the lens driving apparatus as claimed in claim 1, wherein the rotary coupling mechanism comprises:
the bearing fixing part is connected with the top of the shell and protrudes out of the top of the shell;
one end of the rotary drum close to the top of the shell extends into the bearing fixing part;
and the bearing is arranged between the bearing fixing part and one end of the rotary drum extending into the bearing fixing part, the axial lead of the rotary drum is coincided with the optical axis by the bearing, the rotary drum can rotate relative to the shell, and the axial direction of the rotary drum is fixed relative to the shell.
8. The drum driving mechanism of the lens driving apparatus as claimed in claim 7, wherein the rotary coupling mechanism further comprises:
and the shielding part is connected to the bearing fixing part and is shielded outside one end of the rotary drum extending into the bearing fixing part over the bearing.
9. The drum driving mechanism of the lens driving device as claimed in claim 1, wherein the housing is fixed to a base, the drum, the stator coil assembly and the rotor are disposed in a chamber formed by the housing and the base, the chamber has a square shape, and the stator coil assembly has four sets and is disposed at four corners of the chamber.
10. The drum driving method of the drum driving mechanism of the lens driving device according to any one of claims 1 to 9, wherein the drum driving method comprises the steps of:
b1, the stator coil assemblies fixed relative to the outer circumference of the rotor are electrified in sequence, and the electrifying sequence is any one of the anticlockwise direction and the clockwise direction;
b2, the stator coil assembly is electrified to generate electromagnetic force to make the rotor receive stable torque to drive the rotary drum to rotate around the optical axis, and the axial direction of the rotary drum is fixed relative to the shell.
11. Lens driving device, characterized by a drum driving mechanism having a lens driving device according to any one of claims 1 to 9.
12. An image pickup apparatus comprising the lens driving apparatus according to claim 11.
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| CN202111034678.8A CN113467038B (en) | 2021-09-04 | 2021-09-04 | Drum driving mechanism and method for lens driving device, and image pickup apparatus |
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| CN202111034678.8A CN113467038B (en) | 2021-09-04 | 2021-09-04 | Drum driving mechanism and method for lens driving device, and image pickup apparatus |
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