CN212207816U

CN212207816U - Lens actuating device

Info

Publication number: CN212207816U
Application number: CN202021072518.3U
Authority: CN
Inventors: 刘述伦; 耿新龙; 计树标
Original assignee: Dongguan Yadeng Electronics Co Ltd
Current assignee: Guangdong haideya Technology Co.,Ltd.
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-12-22
Anticipated expiration: 2030-06-11

Abstract

The utility model relates to a lens actuating device, which is provided with a supporting base, a lens carrier, a magnetic pre-tightening mechanism and an actuator, wherein the lens carrier is assembled on the supporting base, a guide mechanism for guiding the lens carrier to move freely along the direction of the optical axis of a lens is arranged between the lens carrier and the supporting base, and the guide mechanism is provided with a first guide part formed on the supporting base, a second guide part formed on the lens carrier and a ball arranged between the first guide part and the second guide part; the magnetic pre-tightening mechanism pulls the lens carrier and the supporting base through magnetic force, so that the first guide part and the second guide part have a tendency of approaching each other and compress the balls; the actuator is used for driving the lens carrier to move along the direction of the optical axis of the lens relative to the supporting base. The lens carrier and the supporting base can move freely relatively, and the interval between the lens carrier and the supporting base is determined, so that the lens carrier can move stably and accurately; simple structure, small occupied space and high reliability.

Description

Lens actuating device

Technical Field

The utility model belongs to the technical field of imaging device technique and specifically relates to camera lens actuating device.

Background

With the progress of science and technology, the application of camera modules is more and more extensive, and at present, except cameras, mobile phones, computers and other electronic equipment are equipped with camera modules, so that people can take pictures at any time and any place conveniently, and convenience and fun are brought to the life of people. The camera module comprises a Fixed Focus (FF) camera module and an Automatic Focusing (AF) camera module, and in the AF camera module, a lens can be driven to move by a lens actuating device (motor) so as to realize focusing.

The lens actuating device mainly comprises a carrier and a base, wherein the carrier is used for carrying a lens, and the base is used for limiting the movement of the carrier and is provided with a corresponding electric control part. However, in actual use, due to the defect of the connection structure between the conventional carrier and the base, it is difficult to ensure a proper interval between the carrier and the base when the carrier moves, and there are problems of unsmooth movement of the carrier and looseness.

Disclosure of Invention

An object of the utility model is to provide a camera lens actuating device realizes that the camera lens carrier supports the base relatively and removes, and removes steadily, accurate.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a lens actuating device, having:

a supporting base is arranged on the base, a supporting base is arranged on the supporting base,

a lens carrier which is assembled on a support base, wherein a guide mechanism for guiding the lens carrier to move freely along the optical axis direction of the lens is arranged between the lens carrier and the support base, and the guide mechanism comprises a first guide part formed on the support base, a second guide part formed on the lens carrier and a ball arranged between the first guide part and the second guide part;

the magnetic pre-tightening mechanism pulls the lens carrier and the support base through magnetic force, so that the first guide part and the second guide part have a trend of approaching each other and compress the balls;

and the actuator is used for driving the lens carrier to move relative to the supporting base along the direction of the optical axis of the lens.

The first guide part and the second guide part of the guide mechanism are concave arc grooves matched with the outer contours of the balls, the first guide part and the second guide part face each other in the magnetic force direction of the magnetic pre-tightening mechanism, the balls are embedded between the first guide part and the second guide part, and the balls are at least two and are stacked along the optical axis direction of the lens.

The technical scheme is that the guide mechanisms are arranged on one side edge of the lens carrier in parallel from left to right, and the magnetic pre-tightening mechanisms are distributed between the left guide mechanism and the right guide mechanism.

The magnetic pre-tightening mechanism comprises a magnet and a magnetizer, wherein the magnet is assembled on the lens carrier and positioned between the left guide mechanism and the right guide mechanism; the magnetizer is assembled on the supporting base and is opposite to the magnet.

The above-mentioned scheme is further, the magnetizer is the rectangular board, and the magnetizer bridges left and right guiding mechanism and the end of magnetizer is at least just to the axis of first guide part, and this axis is that first guide part extends along the lens optical axis direction and forms.

The supporting base is provided with functional columns protruding in the same direction at four corners of the periphery of the optical axis of the lens, the lens carrier is embedded in a space enclosed by the functional columns, and the first guide portion is arranged on the inner side surface provided by the functional columns and faces the lens carrier.

The above solution is further that the actuator is an SMA actuator, and includes an elastic actuation arm and an SMA wire, where the elastic actuation arm has a fixed end, an actuation end, and a second elastic part, the second elastic part is located between the fixed end and the actuation end, the elastic actuation arm is positioned and mounted on the support base through the fixed end, and the actuation end of the elastic actuation arm is connected to the lens carrier through a flexible hinge; the SMA wire is connected with the second elastic part of the elastic actuating arm, and an included angle is formed between the axial direction of the SMA wire and the direction of the actuating end; the actuating force generated by the heating contraction of the SMA wire is transmitted to the lens carrier through the elastic actuating arm, so that the lens carrier moves along the optical axis direction of the lens.

In the above solution, the actuator further includes two elastic actuating arms, two ends of the SMA wire are respectively connected to the second elastic portions of the two elastic actuating arms, and actuating ends of the two elastic actuating arms are oriented to intersect and are respectively connected to the lens carrier through the flexible hinges, so that the two elastic actuating arms and the SMA wire form a triangular relationship.

The above scheme is further that the actuator is arranged on the periphery of the lens carrier according to a single side, two opposite sides or four sides, so that the lens carrier can move forward and backward along the optical axis direction of the lens.

The utility model discloses be equipped with the guide mechanism that guides the lens carrier freely to move along the lens optical axis direction between lens carrier and support base, guide mechanism have form in support base on first guide portion, form in the second guide portion on the lens carrier and dispose in the ball between first guide portion and second guide portion; still draw through magnetism pretension mechanism and hold between camera lens carrier and the support base, make first guide portion and second guide portion have the trend of being close to each other and compress tightly the ball, the ball satisfies between camera lens carrier and the support base relative free movement, gives simultaneously and confirms the interval between camera lens carrier and the support base, gives the pre-compaction through magnetism pretension mechanism and stabilizes this clearance, makes camera lens carrier remove steadily, accurately. Simple structure, small occupied space and high reliability.

Description of the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

FIG. 3 is a schematic structural diagram of two embodiments of the present invention;

FIG. 4 is a schematic structural diagram of three embodiments of the present invention;

fig. 5 is a schematic structural diagram of four embodiments of the present invention.

The specific implementation mode is as follows:

the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 and 2, which are views illustrating an embodiment of the present invention, the present invention relates to a lens actuating device, which includes a supporting base 1, a lens carrier 2, a magnetic pre-tightening mechanism 4 and an actuator 5. The lens carrier 2 is assembled on the supporting base 1, and a guiding mechanism for guiding the lens carrier 2 to move freely along the optical axis direction of the lens is arranged between the lens carrier 2 and the supporting base 1, and the guiding mechanism comprises a first guiding part 11 formed on the supporting base 1, a second guiding part 21 formed on the lens carrier 2 and a ball 3 arranged between the first guiding part 11 and the second guiding part 21. This pretension mechanism is inhaled to magnetism 4 draws through magnetic force and holds lens carrier 2 and support base 1, makes first guide portion 11 and second guide portion 21 have the trend of being close to each other and compress tightly ball 3, confirms stable position relation, satisfies relative free movement between lens carrier 2 and the support base 1, gives simultaneously and confirms accurate interval between lens carrier 2 and the support base 1, makes lens carrier 2 remove steadily, accurately. The magnetic pre-tightening mechanism 4 works through magnetic attraction, has a simple structure, is convenient to manufacture and assemble, and can provide balanced and effective pressing force for the ball 3 when the lens carrier 2 moves. The actuator 5 is used for driving the lens carrier 2 to move along the direction of the optical axis of the lens relative to the supporting base 1, so as to realize lens focusing.

Referring to fig. 1 and 2, in the embodiment, the first guide portion 11 and the second guide portion 21 of the guide mechanism are concave arc grooves matching the outer contour of the ball 3 to form a wrapping shape, so that a contact surface is increased, effective limiting is provided for the ball, and stable movement is ensured. The first guide part 11 and the second guide part 21 face each other in the magnetic force direction of the magnetic pretension mechanism 4, the first guide part 11 and the second guide part 21 extend along the optical axis direction of the lens to form a long groove, the balls 3 are embedded between the first guide part 11 and the second guide part 21, and the balls 3 are at least two and are stacked along the optical axis direction of the lens, so that the guiding performance is improved. Further, in this embodiment, the guiding mechanisms are arranged in parallel on the left and right sides of one side of the lens carrier 2, and the magnetic pre-tightening mechanisms 4 are distributed between the left and right guiding mechanisms; the structure increases the guiding effect, and the arrangement number of the specific guiding mechanisms is set according to the actual requirement, and is not limited herein. The magnetic pre-tightening mechanism 4 is arranged between the left guide mechanism and the right guide mechanism, the whole structure is simplified, and balanced and stable pre-tightening force is given to the left guide mechanism and the right guide mechanism.

Referring to fig. 1 and 2, in the embodiment, the magnetic pretightening mechanism 4 includes a magnet 41 and a magnetizer 42, and the magnet 41 is assembled on the lens carrier 2 and located between the left and right guiding mechanisms; the magnetizer 42 is assembled on the supporting base 1 to face the magnet 41. Further, the magnetizer 42 is a strip plate, the magnetizer 42 is connected across the left and right guide mechanisms, and the end of the magnetizer 42 at least faces the central axis of the first guide portion 11, and the central axis is formed by extending the first guide portion 11 along the optical axis direction of the lens. This structure guarantees that left and right guide mechanism under the magnetic force effect, and first guide 11 and second guide 21 malleation ball 3 obtain balanced, stable pretightning force. Simple structure, convenient manufacture and small and exquisite body shape.

Referring to fig. 1 and 2, in the embodiment, the supporting base 1 is provided with the functional pillars 12 protruding in the same direction at four corners of the periphery of the optical axis of the lens, the lens carrier 2 is embedded in a space surrounded by the functional pillars 12, the first guiding portion 11 is disposed on an inner side surface provided by the functional pillars 12 and faces the lens carrier 2, the functional pillars 12 constructing the first guiding portion 11 are designed to be L-shaped, and a portion of the corresponding lens carrier 2 constructing the second guiding portion 21 is also designed to match the shape of the L-shaped functional pillars 12, so that the positioning and contact surface is good, and the guiding function is improved.

Referring to fig. 1 to 5, in the present embodiment, the actuator 5 is an SMA actuator, and includes an elastic actuator arm 51 and an SMA wire 52, where the elastic actuator arm 51 has a fixed end 511, an actuating end 512, and a second elastic portion 513, the second elastic portion 513 is located between the fixed end and the actuating end, the elastic actuator arm is located and installed on the supporting base 1 through the fixed end, and the actuating end of the elastic actuator arm is connected to the lens carrier 2 through a flexible hinge 53. When the lens carrier 2 moves, the flexible hinge 53 provides follow-up deformation to match the movement, so that the friction resistance and the loss are reduced, the use is prolonged, the driving precision and accuracy are improved, and the performance of driving the lens to move along the optical axis is better. The SMA wire 52 is connected with the second elastic part 513 of the elastic actuating arm, and the axial direction of the SMA wire forms an included angle with the direction of the actuating end; the actuating force generated by the heating contraction of the SMA wire is transmitted to the lens carrier 2 through the elastic actuating arm, so that the lens carrier 2 moves along the optical axis direction of the lens, and the actuating performance of the SMA wire is the prior art and is not described herein again. Furthermore, the actuator comprises two elastic actuating arms 51, two ends of the SMA wire 52 are respectively connected with the second elastic parts 513 of the two elastic actuating arms, and the actuating ends 512 of the two elastic actuating arms point to be crossed and are respectively connected with the lens carrier 2 through the flexible hinges 53, so that the two elastic actuating arms and the SMA wire form a triangular relation, the driving is stable and accurate, and the focusing performance of the lens is improved under the cooperation of the guide mechanism.

Referring to fig. 1 and 2, in the present embodiment, the actuators are disposed on the periphery of the lens carrier 2 according to a single side, and the actuators satisfying the positive and negative movement of the lens carrier 2 along the optical axis of the lens are disposed on the single side at the same time. In this embodiment, the actuators 5 are distributed outside the magnetizer 42 of the magnetic pre-tightening mechanism 4, the middle section of the magnetizer 42 starts to avoid the window to connect the flexible hinge 53 of the actuator 5 with the lens carrier 2, and the lens carrier 2 has corresponding outer convex parts to penetrate through the avoiding window to connect the flexible hinge 53, so that the magnetic pre-tightening is satisfied, and the actuator is ensured to drive the lens carrier 2 to move. In the present embodiment, as shown in fig. 3, the actuators are disposed on two opposite sides of the outer periphery of the lens carrier 2, and each side has a forward and reverse driving actuator, so that the lens carrier 2 can move forward and reverse along the optical axis of the lens. In the embodiment shown in fig. 4 and 5, the actuators are arranged on four sides of the periphery of the lens carrier 2, each side of the embodiment of fig. 4 has a forward and reverse driving actuator, and the driving directions of the actuators on the adjacent sides of the embodiment of fig. 5 are opposite, so that the lens carrier 2 can move forward and reverse along the optical axis direction of the lens.

The present invention has been described in detail with reference to the embodiments, and only for the purpose of illustrating the technical concept and features of the present invention, the present invention is intended to be understood and implemented by those skilled in the art, and the protection scope of the present invention can not be limited thereby, so that equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A lens actuating apparatus, comprising:

a supporting base (1),

a lens carrier (2), wherein the lens carrier (2) is assembled on a support base (1), a guide mechanism for guiding the lens carrier (2) to move freely along the optical axis direction of the lens is arranged between the lens carrier (2) and the support base (1), and the guide mechanism comprises a first guide part (11) formed on the support base (1), a second guide part (21) formed on the lens carrier (2), and a ball (3) arranged between the first guide part (11) and the second guide part (21);

the magnetic pre-tightening mechanism (4) pulls the lens carrier (2) and the support base (1) through magnetic force, so that the first guide part (11) and the second guide part (21) have a tendency of approaching each other and press the balls (3);

and the actuator (5) is used for driving the lens carrier (2) to move along the direction of the optical axis of the lens relative to the supporting base (1).

2. A lens actuating apparatus according to claim 1, wherein the first guide portion (11) and the second guide portion (21) of the guide mechanism are concave arc grooves matching the outer contour of the ball (3), the first guide portion (11) and the second guide portion (21) face each other in the magnetic force direction of the magnetically attracting preload mechanism (4), the ball (3) is embedded between the first guide portion (11) and the second guide portion (21), and the ball (3) has at least two and is stacked in the optical axis direction of the lens.

3. A lens actuating apparatus according to claim 1 or 2, wherein the guide means are juxtaposed to each other in a left-right direction on one side of the lens carrier (2), and the magnetically biasing means (4) are distributed between the left and right guide means.

4. A lens actuating apparatus according to claim 3, wherein said magnetically pretightening mechanism (4) comprises a magnet (41) and a magnetizer (42), the magnet (41) is assembled on the lens carrier (2) and located between the left and right guiding mechanisms; the magnetizer (42) is assembled on the supporting base (1) and is opposite to the magnet (41).

5. The lens actuating apparatus according to claim 4, wherein the magnetizer (42) is a strip plate, the magnetizer (42) bridges the left and right guide mechanisms, and an end of the magnetizer (42) faces at least a central axis of the first guide portion (11), the central axis being formed by extending the first guide portion (11) in the direction of the optical axis of the lens.

6. A lens actuating apparatus according to claim 1, wherein the supporting base (1) is provided with function pillars (12) protruding in the same direction at four corners of the periphery of the optical axis of the lens, the lens carrier (2) is embedded in a space enclosed by the function pillars (12), and the first guide portion (11) is provided on an inner side surface provided by the function pillars (12) and faces the lens carrier (2).

7. A lens actuating device according to claim 1, wherein the actuator (5) is an SMA actuator comprising an elastic actuating arm (51) and an SMA wire (52), the elastic actuating arm (51) having a fixed end (511), an actuating end (512) and a second elastic part (513), the second elastic part (513) being located between the fixed end and the actuating end, the elastic actuating arm being positionally mounted on the support base (1) via the fixed end, the actuating end of the elastic actuating arm being connected to the lens carrier (2) via a flexible hinge (53); the SMA wire (52) is connected with a second elastic part (513) of the elastic actuating arm, and the axial direction of the SMA wire forms an included angle with the direction of the actuating end; actuating force generated by the heating contraction of the SMA wire is transmitted to the lens carrier (2) through the elastic actuating arm, so that the lens carrier (2) moves along the direction of the optical axis of the lens.

8. A lens actuating device according to claim 7, wherein the actuator comprises two resilient actuating arms (51), the two ends of the SMA wire (52) are respectively connected to the second resilient portions (513) of the two resilient actuating arms, and the actuating ends (512) of the two resilient actuating arms are oriented crosswise and are respectively connected to the lens carrier (2) by means of flexible hinges (53), so that the two resilient actuating arms and the SMA wire form a triangular relationship.

9. A lens actuating apparatus according to claim 7 or 8, wherein said actuator is disposed on the outer periphery of the lens carrier (2) according to a one-sided arrangement, an opposite two-sided arrangement or a four-sided arrangement, so as to allow the lens carrier (2) to move forward and backward in the direction of the optical axis of the lens.