CN219417838U - Focusing device for optical lens - Google Patents

Abstract

The application relates to an optical lens focusing device. The optical lens focusing device comprises an end cover, a stator assembly, a rotor assembly and an optical lens, wherein the stator assembly is connected with the end cover, the rotor assembly is arranged in the end cover and can rotate along the radial direction of the stator assembly and displace along the axial direction, the rotor assembly comprises a motor rotating shaft, an accommodating cavity with at least one opening is arranged in the axial direction of the motor rotating shaft, a first external thread part is arranged at one end of the optical lens, a first internal thread part is arranged in the accommodating cavity, and the optical lens is in threaded connection with the first internal thread part of the motor rotating shaft through the first external thread part. The optical lens focusing device can be used for conveniently installing and detaching the optical lens, and meanwhile, the optical lens has good radial concentricity and axial movement precision.

Description

Focusing device for optical lens

Technical Field

The application relates to the technical field of motors, in particular to an optical lens focusing device.

Background

The motor is usually matched with an optical lens, so that the motor has an image pickup function.

In the related art, the optical lens is often connected with the rotor of the motor through a key and a key slot, so that the optical lens cannot be fixed in the axial direction of the rotor of the motor, and the radial concentricity and the axial movement precision of the optical lens can be affected.

Disclosure of Invention

An objective of the present application is to provide an optical lens focusing apparatus, so as to solve the technical problems existing in the related art.

The application provides an optical lens focusing device, including end cover, stator module, rotor subassembly and optical lens, stator module with the end cover is connected, rotor subassembly locates in the end cover and can follow stator module's radial direction rotates and axis direction displacement, rotor subassembly includes the motor pivot, the axial of motor pivot is equipped with at least one end open-ended and holds the chamber, the one end of optical lens is equipped with first external screw thread portion, it is equipped with first internal screw thread portion to hold the intracavity, optical lens passes through first external screw thread portion with motor pivot first internal screw thread portion threaded connection.

Optionally, the stator assembly includes an outer silicon steel sheet set and a coil, the outer silicon steel sheet set is connected to the end cover, the rotor assembly further includes an inner silicon steel sheet set, the inner silicon steel sheet set is sleeved on the motor shaft, and the coil is disposed between the outer silicon steel sheet set and the inner silicon steel sheet set.

Optionally, the end cover includes a first end cover and a second end cover, the optical lens focusing device further includes a first fastener, the outer silicon steel sheet set is located between the first end cover and the second end cover, and the outer silicon steel sheet set is fixed on the first end cover and/or the second end cover through the fastener.

Optionally, a mounting hole for mounting the optical lens focusing device on an external mechanism is formed in the second end cover; and/or the number of the groups of groups,

the end face of the second end cover, which is far away from the first end cover, is provided with an annular positioning boss.

Optionally, the optical lens focusing device further comprises a first transmission member, a second transmission member and a second fastener, wherein the first transmission member is fixed on the first end cover or the second end cover through the second fastener, the second transmission member is sleeved on the motor rotating shaft, a second external thread part is arranged on the outer peripheral wall of the second transmission member, a second internal thread part is arranged on the inner peripheral wall of the first transmission member, and the first transmission member is in clearance fit with the second external thread part of the second transmission member through the second internal thread part.

Optionally, the optical lens focusing device further comprises a bidirectional bearing, wherein the bidirectional bearing is sleeved on the motor rotating shaft and is positioned between the end part of the motor rotating shaft and the first transmission piece and/or the second transmission piece.

Optionally, the optical lens focusing device further comprises a bidirectional bearing stop ring, the bidirectional bearing stop ring is sleeved at the end part of the motor rotating shaft, and the bidirectional bearing is located between the bidirectional bearing stop ring and the first transmission piece and/or the second transmission piece.

Optionally, the number of the bidirectional bearing and the bidirectional bearing stop ring is two, one of the bidirectional bearing and one of the bidirectional bearing stop rings is arranged at one end of the motor rotating shaft, and the other bidirectional bearing stop ring are arranged at the other end of the motor rotating shaft.

Optionally, the optical lens focusing device further comprises a thrust bearing and a wave spring, wherein the thrust bearing and the wave spring are sequentially arranged between the inner silicon steel sheet group and the first transmission piece.

Optionally, the axis of the optical lens and the axis of the rotor assembly are on the same straight line.

In this application, through connect optical lens in rotor assembly's motor shaft, because rotor assembly can radial rotation and axial displacement relative stator module, from this, optical lens just can rotate and follow motor shaft relative end cover and stretch out or withdraw with this purpose that can realize focusing to optical lens, in addition, connect through the mode of screw thread between optical lens and the motor shaft, on the one hand can conveniently install optical lens in motor shaft, also very convenient when dismantling optical lens from motor shaft simultaneously, on the other hand, through the mode of threaded connection, optical lens also can very steadily fix in motor shaft, radial concentricity and axial motion precision when guaranteeing optical lens motion.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and, together with the description, do not limit the application. In the drawings:

fig. 1 is a schematic structural diagram of an optical lens focusing apparatus according to an exemplary embodiment of the present application;

FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1;

FIG. 3 is an exploded schematic view of an optical lens focusing apparatus according to an exemplary embodiment of the present application, wherein the first and second end caps are not shown;

fig. 4 is a schematic view of another view of fig. 3.

Description of the reference numerals

10-a first end cap; 20-a second end cap; 21-mounting holes; 22-an annular positioning boss; 31-an outer silicon steel sheet group; a 32-coil; 33-bolts; 41-inner silicon steel sheet groups; 42-motor shaft; 43-bi-directional bearing ring stop; 50-an optical lens; 51-a first external thread portion; 60-a bidirectional bearing; 71-a first transmission member; 72-a second transmission member; 73-a screw; 80-wave spring; 90-thrust bearing.

Detailed Description

The following detailed description of specific embodiments of the present application refers to the accompanying drawings. It should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application.

In this application, unless otherwise indicated, the terms "upper and lower" refer to the orientation or positional relationship in which a product is conventionally placed in use, and may be understood as upper and lower along the direction of gravity, which also correspond to "upper and lower" in the drawings. In addition, it should be noted that terms such as "first", "second", etc. are used to distinguish one element from another element without order or importance.

As shown in fig. 1 and 2, the present application provides an optical lens focusing apparatus including an end cap, a stator assembly, a rotor assembly, and an optical lens 50.

The stator assembly is connected with the end cover, the rotor assembly is arranged in the end cover and can rotate along the radial direction of the stator assembly and displace along the axial direction, namely, the rotor assembly can displace along the axial direction of the stator assembly when rotating along the radial direction of the stator assembly, the rotor assembly comprises a motor rotating shaft 42, an accommodating cavity with at least one opening is arranged in the axial direction of the motor rotating shaft 42, a first external thread part 51 is arranged at one end of an optical lens 50, a first internal thread part (not shown in the figure) is arranged in the accommodating cavity, and the optical lens 50 is in threaded connection with the first internal thread part of the motor rotating shaft 42 through the first external thread part 51.

Through the above technical scheme, through connecting the optical lens 50 on the motor rotating shaft 42 of the rotor assembly, because the rotor assembly can rotate radially and axially displace relative to the stator assembly, the optical lens 50 can rotate along with the motor rotating shaft 42 and extend or retract relative to the end cover, thereby achieving the purpose of focusing the optical lens 50, in addition, the optical lens 50 and the motor rotating shaft 42 are connected in a threaded manner, on one hand, the optical lens 50 can be conveniently installed on the motor rotating shaft 42, and meanwhile, the optical lens 50 can be very conveniently detached from the motor rotating shaft 42, on the other hand, the optical lens 50 can be very stably fixed on the motor rotating shaft 42 in a threaded connection manner, so that the axial fixation of the optical lens 50 on the motor rotating shaft 42 is realized, and the radial concentricity and the axial movement precision of the optical lens 50 during movement are ensured.

As shown in fig. 2, 3 and 4, in the present embodiment, the stator assembly includes an outer silicon steel sheet set 31 and a coil 32, the outer silicon steel sheet set 31 includes a plurality of silicon steel sheets stacked together, the outer silicon steel sheet set 31 is connected to the end cover, the outer silicon steel sheet set 31 and the coil 32 both encircle the stator assembly, the rotor assembly further includes an inner silicon steel sheet set 41, the inner silicon steel sheet set 41 includes a plurality of silicon steel sheets stacked together, the inner silicon steel sheet set 41 is sleeved on the motor rotating shaft 42, the coil 32 is disposed between the outer silicon steel sheet set 31 and the inner silicon steel sheet set 41, and when the coil 32 is energized, an alternating magnetic force generated by the coil is transmitted to the inner silicon steel sheet set 41 through the outer silicon steel sheet set 31, thereby driving the motor rotating shaft 42 to generate radial rotation relative to the stator assembly through the inner silicon steel sheet set 41, and driving the optical lens 50 to rotate along the radial direction of the stator assembly.

As shown in fig. 2, in this embodiment, the end caps include a first end cap 10 and a second end cap 20, the optical lens focusing device further includes a first fastener, the outer silicon steel sheet group 31 is located between the first end cap 10 and the second end cap 20, the outer silicon steel sheet group 31 is fixed on the first end cap 10 and/or the second end cap 20 by the first fastener, specifically, a connection through hole may be formed on the outer silicon steel sheet group 31, the connection through hole penetrates through each silicon steel sheet of the outer silicon steel sheet group 31, and a plurality of connection through holes may be uniformly formed on the outer silicon steel sheet group 31, thereby, the first fastener may be a bolt 33 penetrating through the connection through hole and connecting with the first end cap 10 and/or the second end cap 20, and correspondingly, a threaded hole matched with the bolt 33 may be formed on the first end cap 10 and the second end cap 20, so that the outer silicon steel sheet group 31 may be stably fixed between the first end cap 10 and the second end cap 20.

In the specific installation, the outer silicon steel sheet group 31 may be fixed only on the first end cap 10, and at this time, the installation directions of the plurality of bolts 33 are consistent; or the outer silicon steel sheet group 31 may be fixed only on the second end cap 20, at this time, the installation directions of the plurality of bolts 33 are identical; alternatively, the outer silicon steel sheet set 31 may be fixed to the first end cap 10 and the second end cap 20 at the same time, that is, the installation directions of the plurality of bolts 33 are different, one part of the installation directions of the bolts 33 is directed to the first end cap 10, and the other part of the installation directions of the bolts 33 is directed to the second end cap 20, that is, the outer silicon steel sheet set 31 is connected to the first end cap 10 and the second end cap 20 at the same time through the bolts 33.

As shown in fig. 1, in the embodiment of the present application, the second end cover 20 is provided with a mounting hole 21 for mounting the optical lens focusing apparatus to an external mechanism, whereby the optical lens focusing apparatus can be mounted to the external mechanism by the mounting hole 21 in cooperation with other fasteners (e.g., bolts or bolts and nuts).

As shown in fig. 1, the end surface of the second end cover 20 far from the first end cover 10 is provided with an annular positioning boss 22, the annular positioning boss 22 protrudes out of the end surface of the second end cover 20, the annular positioning boss 22 is arranged around the motor rotating shaft 42, the diameter of the annular positioning boss 22 is larger than that of the motor rotating shaft 42, the annular positioning boss 22 can be matched with a positioning groove of an external mechanism, and the annular positioning boss 22 is embedded into the positioning groove of the external mechanism, so that the installation and positioning of the optical lens focusing device are realized.

As shown in fig. 2 and fig. 3, in the embodiment of the present application, the optical lens focusing device further includes a first driving member 71, a second driving member 72 and a second fastener, where the first driving member 71 and the second driving member 72 are respectively in a ring shape, the diameter of the first driving member 71 is greater than that of the second driving member 72, the first driving member 71 is fixed on the first end cover 10 or the second end cover 20 through the second fastener, and the second fastener may use a screw 73, correspondingly, a screw 73 hole matched with the screw 73 is provided on the first end cover 10 and the second end cover 20, so that the first driving member 71 can be stably mounted on the first end cover 10 or the second end cover 20, the second driving member 72 is sleeved on the motor shaft 42, the outer peripheral wall of the second driving member 72 is provided with a second external thread portion, and the inner peripheral wall of the first driving member 71 is provided with a second internal thread portion, that is in clearance fit with the second external thread portion of the second driving member 72, that is, the first driving member 71 is sleeved on the second driving member motor shaft 71, and when the first driving member 71 is in the clearance fit with the second driving member 72, the second driving member 72 is able to rotate relative to the motor shaft 42, and the stator assembly can rotate relative to the second driving member 72, when the first driving member and the second driving member 72 rotates relative to the motor member 72, and the stator assembly can rotate relative to the first driving member 72, thereby realize relative to the rotation between the driving member and the first driving member and the second driving member 72 and the optical member. By using the first transmission member 71 and the second transmission member 72, the motor shaft 42 can be moved back and forth along the axial direction of the stator assembly, a motion reversing mechanism of a conventional motor can be omitted, and the influence of a complex mechanism on focusing accuracy can be reduced, so that the focusing accuracy of the optical lens focusing device can be remarkably improved.

In this application, the number of the first transmission members 71 and the second transmission members 72 is two, and a first transmission member 71 and a second transmission member 72 form a group of transmission assemblies, and a group of transmission assemblies are disposed in the first end cover 10, and a group of transmission assemblies are disposed in the second end cover 20, i.e., a group of transmission assemblies are disposed at two ends of the motor shaft 42, respectively, so that the radial rotation and axial movement of the motor shaft 42 and the optical lens 50 relative to the stator assembly are smoother.

In this embodiment, the optical lens focusing device further includes a bidirectional bearing 60, where the bidirectional bearing 60 is sleeved on the motor rotating shaft 42 and is located between the end of the motor rotating shaft 42 and the first driving member 71 and/or the second driving member 72, and by setting the bidirectional bearing 60, the accuracy of the movement of the rotor assembly in the axial direction and the radial direction during the spiral back-and-forth movement can be ensured, so that focusing is more accurate, and focusing accuracy is improved.

Because the bidirectional bearing 60, the motor rotating shaft 42, the first transmission member 71 and the second transmission member 72 are all located inside the end cover, and at the same time, at least part of the optical lens 50 is located inside the motor rotating shaft 42, that is, the inside of the motor rotating shaft 42 is of a hollow structure, the mechanism of the optical lens focusing device can be compact, the occupied space is smaller, and the weight of the motor part in the optical lens focusing device is reduced. In addition, the second internal thread portion of the first transmission member 71 and the second external thread portion of the second transmission member 72 are clearance fit, and the use of the bidirectional bearing 60 is also advantageous in improving the axial movement accuracy and radial concentricity of the optical lens 50.

The optical lens focusing device in the application can adopt a stepping motor and a servo motor, and the adjustment precision is exemplified by the stepping motor, the stepping angle of the stepping motor is 1.8 degrees, the subdivision is 4 subdivisions, the thread pitch of the first transmission piece 71 and the second transmission piece 72 is 0.5mm, the adjustment precision of each pulse is equal to 1.8/4 x 0.5/360=0.000625 mm=0.625 um, the subdivision of the stepping motor can be 128 subdivisions, and the subdivision can be set between 2-16 subdivisions in consideration of reliability, so that the motor repetition precision can be accepted. In addition, the screw pitch can be set to be smaller than 0.5mm according to the requirement, and according to the formula, when the screw pitch is reduced and other parameters are unchanged, the focusing precision can be improved.

The main body part of the optical lens focusing device can be a stepping motor or a servo motor, so that the optical lens focusing device can be produced in batches by a motor manufacturer, and the manufacturing cost is reduced.

As shown in fig. 3, in the present embodiment, the optical lens focusing apparatus further includes a bi-directional bearing stop ring 43, the bi-directional bearing stop ring 43 is sleeved at the end of the motor shaft 42, the bi-directional bearing 60 is located between the bi-directional bearing stop ring 43 and the first transmission member 71 and/or the second transmission member 72, and the bi-directional bearing stop ring 43 can stop the bi-directional bearing 60 to ensure positioning of the bi-directional bearing 60.

In this embodiment, the number of the two-way bearings 60 and the two-way bearing stop rings 43 is two, wherein one of the two-way bearings 60 and one of the two-way bearing stop rings 43 are disposed at one end of the motor shaft 42, and the other two-way bearing 60 and the other two-way bearing stop ring 43 are disposed at the other end of the motor shaft 42.

As shown in fig. 2 and 3, in the present embodiment, the optical lens focusing apparatus further includes a thrust bearing 90 and a wave spring 80, where the thrust bearing 90 and the wave spring 80 are sequentially disposed between the inner silicon steel sheet group 41 and the first transmission member 71, that is, in a direction from the inner silicon steel sheet group 41 to the first transmission member 71, the thrust bearing 90 and the wave spring 80 are sequentially disposed, and the thrust bearing 90 is relatively close to the inner silicon steel sheet group 41 with respect to the wave spring 80.

In the present application, the number of the thrust bearing 90 and the number of the wave springs 80 are two, respectively, wherein one thrust bearing 90 and one wave spring 80 are between one set of transmission components and the inner silicon steel sheet set 41, and the other thrust bearing 90 and the other wave spring 80 are between the other set of transmission components and the inner silicon steel sheet set 41.

In this embodiment, the axis of the optical lens 50 and the axis of the rotor assembly are located on the same line, so that the optical lens 50 can be ensured to have better coaxiality when moving linearly in the axial direction.

The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application. In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in detail.

Moreover, any combination of the various embodiments of the present application may be made, as long as it does not depart from the spirit of the present application, which should also be construed as the subject matter of the present application.

Claims (10)

1. The utility model provides an optical lens focusing device, its characterized in that, includes end cover, stator module, rotor subassembly and optical lens, stator module with the end cover is connected, rotor subassembly locates in the end cover and can follow stator module's radial direction rotates and axis direction displacement, rotor subassembly includes the motor pivot, the axial of motor pivot is equipped with at least one end open-ended and holds the chamber, the one end of optical lens is equipped with first external screw thread portion, hold the intracavity and be equipped with first internal screw thread portion, the optical lens passes through first external screw thread portion with motor pivot's first internal screw thread portion threaded connection.

2. The optical lens focusing apparatus according to claim 1, wherein the stator assembly comprises an outer silicon steel sheet set and a coil, the outer silicon steel sheet set is connected to the end cover, the rotor assembly further comprises an inner silicon steel sheet set, the inner silicon steel sheet set is sleeved on the motor rotating shaft, and the coil is disposed between the outer silicon steel sheet set and the inner silicon steel sheet set.

3. The optical lens focusing apparatus of claim 2, wherein the end caps comprise a first end cap and a second end cap, the optical lens focusing apparatus further comprising a first fastener, the outer set of silicon steel sheets being located between the first end cap and the second end cap, the outer set of silicon steel sheets being secured to the first end cap and/or the second end cap by the fastener.

4. The optical lens focusing apparatus according to claim 3, wherein a mounting hole for mounting the optical lens focusing apparatus to an external mechanism is provided on the second end cover; and/or the number of the groups of groups,

the end face of the second end cover, which is far away from the first end cover, is provided with an annular positioning boss.

5. The optical lens focusing apparatus according to claim 3, further comprising a first transmission member, a second transmission member and a second fastener, wherein the first transmission member is fixed to the first end cover or the second end cover by the second fastener, the second transmission member is sleeved on the motor rotating shaft, a second external thread part is arranged on the outer peripheral wall of the second transmission member, a second internal thread part is arranged on the inner peripheral wall of the first transmission member, and the first transmission member is in clearance fit with the second external thread part of the second transmission member by the second internal thread part.

6. The optical lens focusing apparatus according to claim 5, further comprising a bidirectional bearing, wherein the bidirectional bearing is sleeved on the motor shaft and is located between an end of the motor shaft and the first transmission member and/or the second transmission member.

7. The optical lens focusing apparatus of claim 6, further comprising a bi-directional bearing stop ring, wherein the bi-directional bearing stop ring is sleeved at an end of the motor shaft, and wherein the bi-directional bearing is located between the bi-directional bearing stop ring and the first transmission member and/or the second transmission member.

8. The optical lens focusing apparatus according to claim 7, wherein the number of the two-way bearings and the two-way bearing stop ring is two, respectively, one of the two-way bearings and one of the two-way bearing stop rings is disposed at one end of the motor shaft, and the other of the two-way bearings and the other of the two-way bearing stop rings is disposed at the other end of the motor shaft.

9. The optical lens focusing apparatus according to claim 5, further comprising a thrust bearing and a wave spring, the thrust bearing and the wave spring being disposed in sequence between the inner silicon steel sheet group and the first transmission member.

10. The optical lens focusing apparatus of claim 1, wherein the axis of the optical lens is on a same line as the axis of the rotor assembly.