CN213338176U

CN213338176U - Automatic focusing actuator

Info

Publication number: CN213338176U
Application number: CN202022438943.6U
Authority: CN
Inventors: 董怿
Original assignee: Beijing Kelifor Technology Co ltd
Current assignee: Beijing Kelifor Technology Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-06-01
Anticipated expiration: 2030-10-27

Abstract

The present disclosure relates to an autofocus actuator comprising a carrier for carrying a lens; a base for receiving a carrier; the driving mechanism is used for driving the carrier to move relative to the base along the optical axis direction of the lens; a slide shaft extending in the optical axis direction and disposed between the base and the side wall of the carrier; and a support ball disposed between the base and the side wall of the carrier and disposed non-collinear with the slide shaft, wherein the carrier moves in the optical axis direction under cooperative support of the slide shaft and the support ball. The support balls arranged non-collinear with the slide axis may form at least a three-point support with the slide axis to cooperatively support the carrier. In the automatic focusing process of the carrier, the carrier moves linearly along the sliding shaft all the time, so that the lens moves more stably, the high movement precision is realized, the optical axis of the lens cannot deviate, and the imaging definition is improved. The friction coefficient is reduced by replacing the sliding friction with the rolling friction of the supporting balls, thereby reducing the obstruction to the movement of the carrier.

Description

Automatic focusing actuator

Technical Field

The present disclosure relates to the field of optical technology, and in particular, to an autofocus actuator.

Background

The optical system is a system for imaging or optical information processing, and can be applied in various fields, such as a camera of a mobile phone, a camera or a lens of a projection technology, and as the application of the optical system is more extensive, a user more seeks an optical system with high imaging definition, and for this reason, the application of the auto-focusing function is favored by consumers. In the related art, a spring-suspended lens structure is usually adopted to drive a lens to move so as to realize automatic focusing, but the spring structure causes the optical axis of the lens to deflect in the moving process, so that a shot image or video shakes, and the imaging quality of an optical imaging system is affected.

SUMMERY OF THE UTILITY MODEL

It is an object of the present disclosure to provide an autofocus actuator having a high stability.

To achieve the above object, the present disclosure provides an auto-focus actuator including:

a carrier for carrying a lens;

a base for receiving the carrier;

the driving mechanism is used for driving the carrier to move relative to the base along the optical axis direction of the lens;

a slide shaft extending in an optical axis direction and disposed between the base and a side wall of the carrier; and

a support ball disposed between the base and the side wall of the carrier and disposed non-collinear with the slide axis,

wherein the carrier moves in the optical axis direction under the cooperative support of the slide shaft and the support balls.

Optionally, the driving mechanism includes a coil disposed on the base and a magnet disposed on the carrier and generating electromagnetic induction with the coil, a magnetic yoke is disposed on a side wall of the base on which the coil is disposed, the sliding shaft is disposed on a side of the base on which the coil is disposed, and the magnetic yoke can attract the carrier to abut against the sliding shaft.

Optionally, the support ball is disposed between the carrier and a side wall of the base adjacent to or opposite the drive mechanism.

Alternatively, the number of the support balls is plural, and the plural support balls are arranged in a row in the optical axis direction.

Optionally, the carrier or the base includes stopper stages respectively provided at front and rear ends of the support ball in the optical axis direction.

Optionally, the slide shaft is fixed on a side wall of the base, and a sliding groove for partially accommodating the slide shaft and capable of moving relative to the slide shaft is formed on the side wall of the carrier, and the sliding groove is configured as a V-shaped groove capable of being tangential to an outer surface of the slide shaft.

Optionally, a mounting groove for mounting the sliding shaft is formed on the side wall of the base, and the mounting groove is configured as an arc-shaped groove matched with the profile of the sliding shaft.

Optionally, the contact surface of the carrier for contacting the support ball is configured as a plane.

Optionally, a receiving groove for receiving the supporting ball is formed on the side wall of the base, and the receiving groove is configured as a V-groove capable of being tangent to the outer surface of the supporting ball.

Optionally, a lubricating oil is disposed between the sliding shaft and the sliding groove, and a lubricating oil is disposed between the support ball and the side wall of the carrier.

Through above-mentioned technical scheme, drive arrangement drive carrier is along the sliding shaft relative to the base motion, and the support ball that sets up with the sliding shaft non-colinear can constitute at least three point support with the sliding shaft and support the carrier in coordination. Through setting up the slide axle structure, at the in-process of the auto focus of carrier, the carrier is along slide axle rectilinear movement all the time for the motion of camera lens is more steady, has higher motion precision, guarantees that the optical axis of camera lens can not take place the beat, improves the definition of formation of image. Meanwhile, the carrier is supported by the supporting balls in a cooperative mode, sliding friction is replaced by rolling friction of the supporting balls, the friction coefficient is reduced, and therefore the resistance to the movement of the carrier is reduced.

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

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a top view of an autofocus actuator provided by an exemplary embodiment of the present disclosure;

FIG. 2 is a partial view of the view of FIG. 1 taken along line A-A;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is a top view of an autofocus actuator provided by another exemplary embodiment of the present disclosure;

fig. 5 is a partially enlarged view of a portion B in fig. 4.

Description of the reference numerals

1 carrier 11 runner 12 contact surface

2 base 21 mounting groove 22 holding groove

3 sliding shaft 4 ball 41 stop table

51 coil 52 magnet 6 yoke

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, terms of orientation such as "front and rear" are used in terms of the optical axis direction, and the direction of the carrier away from the base along the optical axis direction is front and the direction of the carrier close to the base is rear, specifically, the upper side in the drawing direction of fig. 2 is front and the lower side is rear. The "inner and outer" are relative to the self-profile of the corresponding component. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

Referring to fig. 1 and 4, the present disclosure provides an autofocus actuator including a carrier 1 for carrying a lens, a base 2 for accommodating the carrier 1, a driving mechanism for driving the carrier 1 to move relative to the base 2 in an optical axis direction of the lens, a slide shaft 3 extending in the optical axis direction and disposed between the base 2 and a side wall of the carrier 1, and a support ball 4 disposed between the base 2 and the side wall of the carrier 1 and disposed non-collinear with the slide shaft 3, wherein the carrier 1 moves in the optical axis direction under cooperative support of the slide shaft 3 and the support ball 4. Here, the slide shaft 3 may be fixed on one of the carrier 1 and the base 2 and slidable with respect to the other, which is not particularly limited by the present disclosure. It should be noted that, in the embodiment of the present disclosure, the length of the slide shaft 3 is set to satisfy the maximum moving stroke of the carrier 1, that is, no matter where the carrier 1 moves, the carrier 1 and the base 2 are always supported on the slide shaft 3 without exceeding the two ends of the slide shaft 3. The support balls 4 can roll in the direction of movement of the carrier 1 or can remain in a fixed position for rolling.

Through the technical scheme, the driving device drives the carrier 1 to move relative to the base 2 along the sliding shaft 3, and the supporting balls 4 arranged non-collinear with the sliding shaft 3 and the sliding shaft 3 can form at least three-point support to cooperatively support the carrier 1. Through setting up 3 structures of slide shaft, at the in-process of the auto focus of carrier 1, carrier 1 is along 3 rectilinear movement of slide shaft all the time for the motion of camera lens is more steady, has higher motion precision, guarantees that the optical axis of camera lens can not take place the beat, improves the definition of formation of image. Meanwhile, the carrier 1 is supported by the supporting balls 4 cooperatively, and the friction coefficient is reduced by replacing sliding friction with rolling friction of the supporting balls 4, so that the resistance to the movement of the carrier is reduced.

In the embodiment of the present disclosure, referring to fig. 1, the driving mechanism includes a coil 51 disposed on the base 2 and a magnet 52 disposed on the carrier 1 and generating electromagnetic induction with the coil 51, a yoke 6 is disposed on a side wall of the base 2 where the coil 51 is disposed, the slide shaft 3 is disposed on a side of the base 2 where the coil 51 is disposed, and the yoke 6 can attract the carrier 1 against the slide shaft 3. The magnet yoke 6 can generate magnetostatic attraction force to the magnet 52, and the magnet 52 is arranged on the carrier 1, so that the carrier 1 is further close to the side surface of the base 2 towards the left shown in the drawing of fig. 1, the carrier 1 is abutted against the sliding shaft 3, the motion process of the carrier 1 is further ensured to be stable, and the optical forming effect is effectively improved. In addition, the magnetic yoke 5 can restrict the direction of magnetic force lines, concentrate the distribution of magnetic beams and avoid magnetic leakage, thereby improving the utilization rate of a magnetic field and saving energy consumption. When the coil 51 is provided on the carrier 1 and the magnet 52 is provided on the base 2, the yoke 6 may be provided on the side wall of the carrier 1 where the coil 51 is provided.

In the embodiment of the present disclosure, referring to fig. 1 and 2, the support balls 4 may be disposed on the same side as the slide shaft 3, for example, on both sides of the driving mechanism. In another embodiment of the present disclosure, as shown in fig. 4, the supporting ball 4 may be disposed between the carrier 1 and the side wall of the base 2 adjacent to or opposite to the driving mechanism, such as the slide shaft 3 disposed at the side where the driving mechanism is disposed, and the supporting ball 4 is disposed diagonally to the slide shaft 3. In this arrangement, the support balls 4 can be prevented from occupying the space of the drive mechanism to provide a larger installation space for the drive mechanism, thereby increasing the driving force to the carrier 1 by providing a drive mechanism of a larger size.

As shown in fig. 2, the number of the support balls 4 may be one or plural, and when plural, the plural support balls 4 may be arranged in a row in the optical axis direction. The linear support is formed by the plurality of support balls 4, so that the support effect is better, the formed linear is the same as the extending direction of the optical axis, the same as the extending direction of the sliding shaft 3 can be ensured, and the support for the carrier 1 is more stable. In addition, the pressure of the carrier 1 can be dispersed by the supporting balls 4, so that the supporting balls 4 are prevented from forming pits on the surface of the carrier 1 due to the pressure of the carrier 1, and the product performance is ensured.

According to an embodiment of the present disclosure, the carrier 1 or the base 2 may include stopper stages 41 respectively provided at front and rear ends of the support ball 4 in the optical axis direction. Both stop platforms 41 may be arranged on the carrier 1, or both stop platforms 41 may be arranged on the base 2, or, as shown in fig. 2, the stop platform 41 at the front end may be arranged on the carrier 1 and the stop platform 41 at the rear end may be arranged on the base 2. The stop table 41 prevents the support ball 4 from coming off, and ensures the mounting reliability of the support ball 4.

In the disclosed embodiment, the slide shaft 3 may be fixed on a side wall of the base 2, and referring to fig. 3, a slide groove 11 for partially accommodating the slide shaft 3 and capable of moving relative to the slide shaft 3 is formed on the side wall of the carrier 1, and the slide groove 11 is configured as a V-shaped groove capable of being tangential to an outer surface of the slide shaft 3. Two lateral walls in V type groove can set to be tangent with the outer wall of slide-shaft 3, adopt V type structure and slide-shaft complex mode, both can guarantee that the movement track of carrier 1 is the straight line all the time, have guaranteed the definition of formation of image, can replace the face contact through line contact again to reduce the coefficient of friction between carrier 1 and the slide-shaft 3 to reduce the resistance of carrier 1 motion. Here, the slide shaft 3 may be made of a high-strength material, so that the autofocus actuator does not cause a loss even after an impact test, thereby ensuring product reliability.

Further, with continued reference to fig. 3, a mounting groove 21 for mounting the slide shaft 3 is formed on the side wall of the base 2, the mounting groove 21 being configured as an arc-shaped groove matching the contour of the slide shaft 3. The arc wall can with slide 3 in close contact with to increase the coefficient of friction between slide 3 and the base 2, guarantee the installation steadiness of slide 3 and base 2, wherein, slide 3 can bond or weld in mounting groove 21.

In the embodiment of the present disclosure, in conjunction with fig. 4 and 5, the contact surface 12 of the carrier 1 for contacting the support ball 4 is configured as a plane. In this way, the support ball 4 and the contact surface 12 are configured in a point contact manner, so that the friction between the support ball 4 and the contact surface 12 can be reduced, and the resistance of the carrier 1 during movement can be reduced.

Referring to fig. 5, a receiving groove 22 for receiving the support ball 4 is formed on a side wall of the base 2, and the receiving groove 22 is configured as a V-groove capable of being tangent to an outer surface of the support ball 4. Two lateral walls in V type groove can set to be tangent with the outer wall that supports ball 4, adopts V type structure and ball complex mode, both can guarantee that the movement track of carrier 1 is the straight line all the time, has guaranteed the definition of formation of image, can replace the face contact through line contact again and reduce the coefficient of friction between carrier 1 and the support ball 4 to reduce the resistance of carrier 1 motion.

In one embodiment, the carrier 1 may be die cast from an alloy material that is strong and impact resistant, such that the carrier 1 has a high mechanical strength after a drop test. Or in another embodiment, the carrier 1 may be made of a polyetheretherketone material, which has high strength and good sliding properties, and which may provide a low coefficient of friction between the carrier 1 and other components, which may facilitate movement of the carrier 1. However, in the embodiments of the present disclosure, the material of the carrier 1 is not limited thereto. For example, when the V-shaped groove is assembled to the carrier 1, only the V-shaped groove may be made of a high-strength material such as an alloy material or polyetheretherketone, and the main body portion of the carrier 1 may be made of plastic or other low-cost materials, thereby saving costs.

In the embodiment of the present disclosure, in order to reduce the friction force for preventing the carrier 1 from moving, a lubricating oil may be disposed between the sliding shaft 3 and the sliding groove 11 to ensure smooth movement of the carrier 1. In another embodiment, lubricating oil may be provided between the supporting balls 4 and the side walls of the carrier 1, such as between the supporting balls 4 and the above-mentioned contact surfaces 12, in order to reduce the movement resistance of the carrier 1 as much as possible.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An autofocus actuator, comprising:

a carrier (1) for carrying a lens;

a seat (2) for accommodating the carrier (1);

the driving mechanism is used for driving the carrier (1) to move relative to the base (2) along the optical axis direction of the lens;

a slide shaft (3) extending in the optical axis direction and disposed between the base (2) and a side wall of the carrier (1); and

a support ball (4) arranged between the base (2) and the side wall of the carrier (1) and arranged non-collinear with the slide shaft (3),

wherein the carrier (1) moves in the optical axis direction under the cooperative support of the slide shaft (3) and the support balls (4).

2. Autofocus actuator according to claim 1, characterized in that the drive mechanism comprises a coil (51) arranged on the base (2) and a magnet (52) arranged on the carrier (1) which generates an electromagnetic induction with the coil (51), a yoke (6) being arranged on the side wall of the base (2) on which the coil (51) is arranged, the slide shaft (3) being arranged on the side of the base (2) on which the coil (51) is arranged, the yoke (6) being able to attract the carrier (1) against the slide shaft (3).

3. Autofocus actuator according to claim 2, characterized in that the support ball (4) is arranged between the carrier (1) and a side wall of the base (2) adjacent to or opposite the drive mechanism.

4. The autofocus actuator according to claim 1, wherein the supporting balls (4) are plural in number, and the plural supporting balls (4) are arranged in a row in the optical axis direction.

5. The autofocus actuator according to claim 1, wherein the carrier (1) or the base (2) includes stopper steps (41) provided at a front end and a rear end of the support ball (4) in the optical axis direction, respectively.

6. Autofocus actuator according to claim 1, characterized in that the slide shaft (3) is fixed to a side wall of the base (2), and in that a slide groove (11) for partially receiving the slide shaft (3) and being movable relative to the slide shaft (3) is formed in the side wall of the carrier (1), which slide groove (11) is configured as a V-groove which can be tangential to the outer surface of the slide shaft (3).

7. Autofocus actuator according to claim 6, characterized in that the side wall of the base (2) is formed with a mounting groove (21) for mounting the slide shaft (3), which mounting groove (21) is configured as an arc-shaped groove matching the contour of the slide shaft (3).

8. Autofocus actuator according to claim 1, characterized in that the contact surface (12) of the carrier (1) for contacting the support ball (4) is configured as a plane.

9. Autofocus actuator according to claim 1, characterized in that the side wall of the base (2) is formed with a receiving groove (22) for receiving the support ball (4), the receiving groove (22) being configured as a V-groove which can be tangent to the outer surface of the support ball (4).

10. Autofocus actuator according to claim 6, characterized in that a lubricant is arranged between the slide shaft (3) and the slide groove (11) and a lubricant is arranged between the support ball (4) and the side wall of the carrier (1).