CN111308641A

CN111308641A - Lens driving device for auto-focusing, camera device, and electronic apparatus

Info

Publication number: CN111308641A
Application number: CN202010148440.7A
Authority: CN
Inventors: 余林涛; 曹宏
Original assignee: Ruien Photoelectric Co ltd
Current assignee: Ruien Photoelectric Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-06-19

Abstract

The present disclosure provides a lens driving device for auto-focusing, including: a lens support part having a hollow part for accommodating a lens; a base part having a space for accommodating the lens support part, the base part being disposed outside the lens support part; a first SMA elastic body connected between the lens support part and the base part; and a second SMA elastomer connected between the lens support part and the base part; the first SMA elastic body and the second SMA elastic body are arranged at intervals along the optical axis direction, and the first SMA elastic body and/or the second SMA elastic body are electrified to drive the lens support part to move relative to the base part along the optical axis direction. The disclosure also provides a camera device and an electronic apparatus.

Description

Lens driving device for auto-focusing, camera device, and electronic apparatus

Technical Field

The present disclosure belongs to the field of auto-focusing technologies, and in particular, to a lens driving device for auto-focusing, a camera device, and an electronic apparatus.

Background

With the demand for high pixels of cameras in cellular phones, the increase in mass and size of camera modules in cellular phones is significant, requiring a lens driving device with a larger driving force and with a reduced size.

Therefore, a new lens driving apparatus is required to overcome the above problems.

Disclosure of Invention

In order to solve at least one of the above-described technical problems, the present disclosure provides a lens driving device for auto-focusing, a camera device, and an electronic apparatus.

According to an aspect of the present disclosure, there is provided a lens driving device for auto-focusing, including: a lens support part having a hollow part for accommodating a lens; a base part having a space for accommodating the lens support part, the base part being disposed outside the lens support part; a first SMA elastic body connected between the lens support part and the base part; and a second SMA elastomer connected between the lens support part and the base part; the first SMA elastic body and the second SMA elastic body are arranged at intervals along the optical axis direction, and the first SMA elastic body and/or the second SMA elastic body are electrified to drive the lens support part to move relative to the base part along the optical axis direction.

According to the lens driving device for automatic focusing of at least one embodiment of the present disclosure, the number of the first SMA elastic bodies is two, the number of the second SMA elastic bodies is two, the two first SMA elastic bodies are oppositely arranged, and the two second SMA elastic bodies are oppositely arranged.

The auto-focusing lens driving device according to at least one embodiment of the present disclosure further includes a first fixing portion and a second fixing portion; the number of the first fixing parts is four, and the number of the second fixing parts is four; the four first fixing parts are respectively arranged at four corner positions of the base part, and the four second fixing parts are respectively arranged at four corner positions of the base part; two end parts of the first SMA elastic body are respectively connected with two adjacent first fixing parts, and the middle part of the first SMA elastic body is fixedly connected with the first end surface of the lens supporting part; two end parts of the second SMA elastic body are respectively connected with two adjacent second fixing parts, and the middle part of the second SMA elastic body is fixedly connected with the second end surface of the lens supporting part.

According to the auto-focusing lens driving device of at least one embodiment of the present disclosure, the auto-focusing lens driving device further includes a third fixing portion, the middle portion of the first SMA elastic body is fixedly connected to the first end surface of the lens support portion through the third fixing portion, and the middle portion of the second SMA elastic body is fixedly connected to the second end surface of the lens support portion through the third fixing portion.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, the middle portion of the first SMA elastic body is fixedly connected to the first end surface of the lens support portion through the two third fixing portions, and the middle portion of the second SMA elastic body is fixedly connected to the second end surface of the lens support portion through the two third fixing portions.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, in an optical axis direction, both end portions of a first SMA elastic body are staggered from a middle portion of the first SMA elastic body, and both end portions of a second SMA elastic body are staggered from a middle portion of the second SMA elastic body, and in a case where neither the first SMA elastic body nor the second SMA elastic body is energized, the first SMA elastic body has a predetermined repulsive force, and the second SMA elastic body has a predetermined repulsive force, so that a lens support portion is held at a predetermined position.

According to the lens driving device for automatic focusing of at least one embodiment of the present disclosure, the base part has a bottom wall and a side wall, and the bottom wall and the side wall enclose a space for accommodating the lens support part; the first fixing part and the second fixing part are both cylinders, and are arranged on the bottom wall of the base part and extend along the optical axis direction; the length of the first fixing part is greater than that of the second fixing part.

According to the auto-focusing lens driving device of at least one embodiment of the present disclosure, the first electrode is provided at the top end of the first fixing portion, the second electrode is provided at the top end of the second fixing portion, the first electrode is used for receiving an external current to energize the first SMA elastic body, and the second electrode swimsuit is used for receiving an external current to energize the second SMA elastic body.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, the distances between the axis of the first fixing portion and the axis of the second fixing portion provided at the same corner portion and the central axis of the lens support portion are equal.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, the middle portion of the first SMA elastic body and the first end face at the corresponding position of the lens support portion have matching shapes; the middle part of the second SMA elastomer and the second end surface at the corresponding position of the lens support part have matching shapes.

The auto-focusing lens driving device according to at least one embodiment of the present disclosure further includes a cover portion having a top wall and a side wall enclosing a space for accommodating the side wall of the base portion, the top wall of the cover portion being disposed opposite to the bottom wall of the base portion.

According to the automatic focusing lens driving device of at least one embodiment of the present disclosure, the magnitude of the repulsive force of the first SMA elastic body is controlled by controlling the magnitude of the current or the magnitude of the current voltage applied to the first SMA elastic body; the size of the repulsive force of the second SMA elastic body is controlled by controlling the size of the current or the voltage applied to the second SMA elastic body.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, the first SMA elastic body has a predetermined memory shape, the second SMA elastic body has a predetermined memory shape, and the predetermined memory shape of the first SMA elastic body is the same as the predetermined memory shape of the second SMA elastic body.

According to the lens driving device for auto-focusing of at least one embodiment of the present disclosure, when the first SMA elastic body is energized, the repulsive force of the first SMA elastic body is increased by a predetermined repulsive force, and when the second SMA elastic body is energized, the repulsive force of the second SMA elastic body is increased by a predetermined repulsive force.

According to another aspect of the present disclosure, there is provided a camera apparatus including the lens driving apparatus for auto-focusing of any one of the above.

According to still another aspect of the present disclosure, there is provided an electronic apparatus including the above-described camera device.

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 exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is one of schematic structural views of a lens driving device for auto-focusing according to an embodiment of the present disclosure.

Fig. 2 is a second schematic structural diagram of an auto-focusing lens driving apparatus according to an embodiment of the present disclosure.

Fig. 3 is a third schematic structural diagram of an auto-focusing lens driving apparatus according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural view of an SMA elastomer of an auto-focusing lens driving apparatus according to an embodiment of the present disclosure.

Fig. 5 is a schematic view of a predetermined memory shape of an SMA elastomer of the lens driving apparatus for auto focus according to one embodiment of the present disclosure.

Fig. 6 is a schematic shape diagram of an SMA elastomer of an autofocus lens driving apparatus according to an embodiment of the present disclosure in different energized states.

Fig. 7 is an energization schematic diagram of an SMA elastomer of an auto-focusing lens driving apparatus according to an embodiment of the present disclosure.

Fig. 8 is an operation diagram of a lens supporting part of the auto-focusing lens driving device according to one embodiment of the present disclosure.

Fig. 9 is a schematic view showing a relationship between a temperature and a repulsive force of an SMA elastic body of the lens driving apparatus for auto focusing according to one embodiment of the present disclosure.

Description of the reference numerals

100 lens driving device for automatic focusing

101 lens support part

1011 third fixing part

102 base part

1021 first fixed part

1022 second fixed part

103 first SMA elastomer

104 second SMA elastomer

105 a cover part.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., as in "side wall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 is a schematic configuration diagram of an autofocus lens driving device 100 according to an embodiment of the present disclosure, and a direction perpendicular to a paper surface is an optical axis direction.

The lens driving device 100 for auto-focusing shown in fig. 1 includes: a lens support part 101, the lens support part 101 having a hollow part for placing a lens therein; a base part 102, the base part 102 having a space for accommodating the lens support part 101, the base part 102 being disposed outside the lens support part 101; a first SMA elastic body 103, the first SMA elastic body 103 being connected between the lens support part 101 and the base part 102; and a second SMA elastomer 104, the second SMA elastomer 104 being connected between the lens support 101 and the base 102; the first SMA elastic body 103 and the second SMA elastic body 104 are provided at intervals in the optical axis direction, and the first SMA elastic body 103 and/or the second SMA elastic body 104 are energized so that the first SMA elastic body 103 and/or the second SMA elastic body 104 drive the lens support portion 101 to move relative to the base portion 102 in the optical axis direction.

Wherein, SMA is shape memory alloy, and SMA elastomer is elastomer made of shape memory alloy.

Fig. 1 exemplarily shows a hollow portion of a circular lens support portion 101. The lens support portion 101 has an extension length in the optical axis direction, the base portion 102 also has an extension length in the optical axis direction, and the extension length of the base portion 102 in the optical axis direction is larger than the extension length of the lens support portion 101 in the optical axis direction.

Preferably, the number of the first SMA elastic bodies 103 and the number of the second SMA elastic bodies 104 of the lens driving device 100 for auto-focusing are two, and the two first SMA elastic bodies 103 and the two second SMA elastic bodies 104 are disposed to face each other.

The two oppositely disposed first SMA elastomers 103 are shown in their entirety in fig. 1, and the two oppositely disposed second SMA elastomers 104 are not shown in their entirety (the middle of the second SMA elastomer is not shown).

Fig. 2 is a second schematic structural diagram of the auto-focusing lens driving device according to an embodiment of the present disclosure, that is, a bottom view of fig. 1.

As is apparent from fig. 2, the first SMA elastic body 103 and the second SMA elastic body 104 are provided at an interval in the optical axis direction, and in fig. 2, the first SMA elastic body 103 is provided at a first end portion of the autofocus lens drive apparatus 100, that is, an upper end portion shown in fig. 2, and the second SMA elastic body 104 is provided at a second end portion of the autofocus lens drive apparatus 100, that is, a lower end portion shown in fig. 2.

Fig. 3 is a third schematic structural view of the auto-focusing lens driving apparatus according to an embodiment of the present disclosure, that is, a right side view of fig. 1.

As is clear from fig. 3, the first SMA elastic body 103 and the second SMA elastic body 104 are provided at an interval in the optical axis direction, and in fig. 3, the first SMA elastic body 103 is provided at a first end of the autofocus lens drive apparatus 100, and the second SMA elastic body 104 is provided at a second end of the autofocus lens drive apparatus 100.

Preferably, the auto-focusing lens driving device 100 further includes a first fixing part 1021 and a second fixing part 1022; the number of the first fixing parts 1021 is four, and the number of the second fixing parts 1022 is four; the four first fixing parts 1021 are respectively arranged at four corner positions of the base part 102, and the four second fixing parts 1022 are respectively arranged at four corner positions of the base part 102; two end parts of the first SMA elastic body 103 are respectively connected with two adjacent first fixing parts 1021, and the middle part of the first SMA elastic body 103 is fixedly connected with the first end surface of the lens support part 101; two end portions of the second SMA elastic body 104 are respectively connected to two adjacent second fixing portions 1022, and a middle portion of the second SMA elastic body 104 is fixedly connected to the second end face of the lens support portion 101.

Preferably, when the two first SMA elastic bodies 103 and the two second SMA elastic bodies 104 are projected into the same plane perpendicular to the optical axis direction, the first SMA elastic bodies and the second SMA elastic bodies are arranged at intervals.

Four first fixing parts 1021 and four second fixing parts 1022 are explicitly shown in fig. 1, one first fixing part 1021 and one second fixing part 1022 being provided at each corner of the base part 102.

For convenience of understanding, for example, in fig. 1, the upper left corner is identified as a first corner, the upper right corner is identified as a second corner, the lower right corner is identified as a third corner, and the lower left corner is identified as a fourth corner, two ends of one first SMA elastic body 103 are respectively connected to a first fixing portion 1021 arranged at the first corner and a first fixing portion 1021 arranged at the second corner, and the middle part is fixedly connected to the upper part of the first end face of the lens support part 101; both ends of the other first SMA elastic body 103 are connected to the first fixing portion 1021 provided at the third corner and the first fixing portion 1021 provided at the fourth corner, respectively, and the middle portion is fixedly connected to the lower portion of the first end surface of the lens support portion 101.

Both ends of one second SMA elastic body 104 are respectively connected with the second fixing part 1022 disposed at the first corner and the second fixing part 1022 disposed at the fourth corner, and the middle part is fixedly connected with the left part of the second end surface (not shown in fig. 1) of the lens support part 101; the other second SMA elastic body 104 has two ends respectively connected to the second fixing portion 1022 disposed at the second corner portion and the second fixing portion 1022 disposed at the third corner portion, and a middle portion fixedly connected to the right portion of the second end surface (not shown in fig. 1) of the lens support portion 101.

Preferably, the auto-focusing lens driving device 100 further includes a third fixing portion 1011, a middle portion of the first SMA elastic body 103 is fixedly connected to the first end surface of the lens support portion 101 through the third fixing portion 1011, and a middle portion of the second SMA elastic body 104 is fixedly connected to the second end surface of the lens support portion 101 through the third fixing portion 1011.

The third fixing portion 1011 provided on the first end surface of the lens holding portion 101 is shown in fig. 1, and the second end surface of the lens holding portion 101 and the third fixing portion 1011 provided thereon are not shown.

Preferably, as shown in fig. 1, the middle portion of each first SMA elastic body 103 is fixedly connected to the first end surface of the lens support portion 101 through two third fixing portions 1011, and the middle portion of each second SMA elastic body 104 is fixedly connected to the second end surface of the lens support portion 101 through two third fixing portions 1011.

Preferably, in the lens driving device 100 for auto-focusing, both end portions of the first SMA elastic body 103 are staggered from a middle portion of the first SMA elastic body 103 and both end portions of the second SMA elastic body 104 are staggered from a middle portion of the second SMA elastic body 104 in the optical axis direction, and when neither of the first SMA elastic body 103 nor the second SMA elastic body is energized, the first SMA elastic body 103 has a predetermined repulsive force and the second SMA elastic body 104 has a predetermined repulsive force, so that the lens support portion 101 is held at a predetermined position.

As shown in fig. 2, the vertical direction on the paper surface is the optical axis direction, two end portions of the first SMA elastic body 103 are staggered from the middle portion of the first SMA elastic body 103, two end portions of the second SMA elastic body 104 are staggered from the middle portion of the second SMA elastic body 104, fig. 2 shows a case where neither the first SMA elastic body 103 nor the second SMA elastic body is energized, the first SMA elastic body 103 has a predetermined repulsive force, and the second SMA elastic body 104 has a predetermined repulsive force, so that the lens support portion 101 is stably held at a predetermined position.

As shown in fig. 3, the horizontal direction on the paper surface is the optical axis direction, two end portions of the first SMA elastic body 103 are staggered from the middle portion of the first SMA elastic body 103, two end portions of the second SMA elastic body 104 are staggered from the middle portion of the second SMA elastic body 104, fig. 3 shows a case where neither the first SMA elastic body 103 nor the second SMA elastic body is energized, the first SMA elastic body 103 has a predetermined repulsive force, and the second SMA elastic body 104 has a predetermined repulsive force, so that the lens support portion 101 is stably held at a predetermined position.

Further, as shown in fig. 2 and 3, the base part 102 of the lens driving device 100 for auto-focusing has a bottom wall and a side wall which enclose a space for accommodating the lens support part 101; the first fixing part 1021 and the second fixing part 1022 are both cylinders, and the first fixing part 1021 and the second fixing part 1022 are both disposed on the bottom wall of the base part 102 and extend in the optical axis direction; the length of the first fixing part 1021 is greater than that of the second fixing part 1022.

Further, the autofocus lens driving apparatus 100 includes a first electrode provided at a distal end of the first fixing unit 1021 and a second electrode provided at a distal end of the second fixing unit 1022, the first electrode being configured to receive an external current to energize the first SMA elastic body 103, and the second electrode being configured to receive an external current to energize the second SMA elastic body 104.

The first fixing portion and the second fixing portion may also adopt other structures/components, and the first electrode and the second electrode may also be respectively arranged at other suitable positions of the first fixing portion and the second fixing portion.

Preferably, the distances between the axis of the first fixing part 1021 and the axis of the second fixing part 1022 provided at the same corner of the lens driving device 100 for auto-focusing and the central axis of the lens support 101 are equal.

Preferably, the middle portion of the first SMA elastic body 103 of the lens driving device 100 for auto focusing and the first end surface at the corresponding position of the lens support part 101 have matching shapes. It is shown in fig. 1 that the middle part of the first SMA elastomer 103 has a matching shape with the upper part of the first end face of the lens support 101.

Accordingly, the middle of the second SMA elastomer 104 has a matching shape with the second end face at the corresponding position of the lens support 101.

Preferably, as shown in fig. 2 and 3, the lens driving device 100 for auto-focusing further includes a cover portion 105, the cover portion 105 has a top wall and a side wall, the top wall and the side wall of the cover portion 105 enclose a space for accommodating the side wall of the base portion 102, and the top wall of the cover portion 105 is disposed opposite to the bottom wall of the base portion 102.

The left drawing in fig. 4 is a schematic structural diagram of two first SMA elastic bodies 103 arranged on a first end face of the lens support part 101, and the right drawing in fig. 4 is a schematic structural diagram of two second SMA elastic bodies 103 arranged on a second end face of the lens support part 101. The middle diagram in fig. 4 is a schematic structural view in which, viewed perpendicularly to the optical axis direction, a first SMA elastomer 103 and a second SMA elastomer 104 are respectively provided on a first end face and a second end face of the lens support section 101.

The auto-focusing lens driving apparatus 100 of the present disclosure controls the magnitude of the repulsive force of the first SMA elastic body 103 by controlling the magnitude of the energization current or the magnitude of the energization voltage to the first SMA elastic body 103; the magnitude of the repulsive force of the second SMA elastic body 104 is controlled by controlling the magnitude of the energization current or the magnitude of the energization voltage to the second SMA elastic body 104.

Preferably, the first SMA elastic body 103 of the autofocus lens driving apparatus 100 has a predetermined memory shape, and the second SMA elastic body 104 has a predetermined memory shape. More preferably, the predetermined memorized shape of the first SMA elastomer 103 is the same as the predetermined memorized shape of the second SMA elastomer 104.

Fig. 5 is a schematic diagram of a predetermined memory shape of an SMA elastomer of the lens driving device 100 for auto-focusing according to an embodiment of the present disclosure.

It will be appreciated by those skilled in the art that the memory shape of the SMA elastomer may be pre-set.

In the present disclosure, when the first SMA elastomer and the second SMA elastomer are not energized, both the first SMA elastomer and the second SMA elastomer are in a repulsive force state, so that the lens support section 101 can be more stably held.

As can be seen from fig. 9, as the temperature of the SMA elastomer increases with an increase in the energization voltage or the energization current, the SMA elastomer is restored toward the predetermined memory shape, so that the repulsive force of the SMA elastomer increases.

When the first SMA elastic body 103 is energized, the repulsive force of the first SMA elastic body 103 is increased by a predetermined repulsive force, and when the second SMA elastic body 104 is energized, the repulsive force of the second SMA elastic body 104 is increased by a predetermined repulsive force.

Fig. 6 is a schematic shape diagram of an SMA elastic body of the auto-focus lens driving apparatus 100 according to an embodiment of the present disclosure in different energization states.

In fig. 6, the right diagram is a state diagram when the SMA elastic body is not electrified, the middle diagram is a shape diagram when a low voltage (or a low current) is electrified to the SMA elastic body, and the left diagram is a shape diagram when a high voltage (or a high current) is electrified to the SMA elastic body.

As shown in the left diagram of fig. 6, when a high voltage is applied to the two ends of the SMA elastic body, the temperature of the SMA elastic body increases, the repulsive force increases, and the SMA elastic body recovers to the predetermined memory shape, and when the applied voltage decreases, as shown in the middle diagram of fig. 6, the temperature of the SMA elastic body decreases, and the repulsive force decreases, and when the power is cut off to the two ends of the SMA elastic body, the temperature of the SMA elastic body further decreases, and the repulsive force further decreases, and the SMA elastic body is easily deformed by an external force.

Fig. 7 is an energization schematic diagram of an SMA elastomer of the lens drive apparatus 100 for auto-focusing according to an embodiment of the present disclosure.

The second SMA elastic body may be energized by the external power supply device B, and the first SMA elastic body may be energized by the external power supply device a.

As shown in the upper diagram of fig. 8, when the first SMA elastic body 103 is energized and the second SMA elastic body 104 is not energized, the repulsive force of the first SMA elastic body 103 is greater than that of the second SMA elastic body 104, so that the lens support apparatus moves downward as indicated by an arrow.

As shown in the lower diagram of fig. 8, when the second SMA elastic body 104 is energized and the first SMA elastic body 103 is not energized, the repulsive force of the second SMA elastic body 104 is greater than that of the first SMA elastic body 103, so that the lens support apparatus acts upward as indicated by an arrow.

As shown in the middle diagram in fig. 8, when the second SMA elastomer 104 is not energised and the first SMA elastomer 103 is not energised, the lens support is held in an equilibrium position as indicated by the arrows.

The magnitude of the repulsive force of the first SMA elastic body 103 can be controlled by controlling the magnitude of the energizing current or the magnitude of the energizing voltage to the first SMA elastic body 103, and the magnitude of the repulsive force of the second SMA elastic body 104 can be controlled by controlling the magnitude of the energizing current or the magnitude of the energizing voltage to the second SMA elastic body 104, so that the movement of the lens support device relative to the base part in the optical axis direction can be more accurately controlled.

The present disclosure also provides a camera apparatus including the above-described lens driving apparatus 100 for auto-focusing.

The present disclosure also provides an electronic device including the above camera apparatus.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A lens driving device for automatic focusing, comprising:

a lens support part having a hollow part for disposing a lens;

a base part having a space for accommodating the lens support part, the base part being disposed outside the lens support part;

a first SMA elastomer connected between the lens support section and the base section; and

a second SMA elastomer coupled between the lens support section and the base section;

the first SMA elastic body and the second SMA elastic body are arranged at intervals along the optical axis direction, and the first SMA elastic body and/or the second SMA elastic body are electrified to drive the lens support part to move relative to the base part along the optical axis direction.

2. The lens driving device for auto-focus according to claim 1, wherein the number of the first SMA elastic bodies is two, the number of the second SMA elastic bodies is two, the two first SMA elastic bodies are disposed to face each other, and the two second SMA elastic bodies are disposed to face each other.

3. The lens driving device for auto-focusing according to claim 2, further comprising a first fixing portion and a second fixing portion;

the number of the first fixing parts is four, and the number of the second fixing parts is four;

the four first fixing parts are respectively arranged at four corner positions of the base part, and the four second fixing parts are respectively arranged at four corner positions of the base part;

two end parts of the first SMA elastic body are respectively connected with two adjacent first fixing parts, and the middle part of the first SMA elastic body is fixedly connected with the first end surface of the lens supporting part;

two end parts of the second SMA elastic body are respectively connected with two adjacent second fixing parts, and the middle part of the second SMA elastic body is fixedly connected with the second end face of the lens supporting part.

4. The lens driving device for automatic focusing according to claim 3, further comprising a third fixing portion, wherein the middle portion of the first SMA elastic body is fixedly connected to the first end surface of the lens support portion through the third fixing portion, and the middle portion of the second SMA elastic body is fixedly connected to the second end surface of the lens support portion through the third fixing portion.

5. The lens driving device for automatic focusing according to claim 4, wherein the first SMA elastic body has a middle portion fixedly connected to the first end surface of the lens support portion via the two third fixing portions, and the second SMA elastic body has a middle portion fixedly connected to the second end surface of the lens support portion via the two third fixing portions.

6. The lens driving device for automatic focusing according to claim 3, wherein both end portions of the first SMA elastic body are offset from a middle portion of the first SMA elastic body and both end portions of the second SMA elastic body are offset from a middle portion of the second SMA elastic body in the optical axis direction, and when neither of the first and second SMA elastic bodies is energized, the first SMA elastic body has a predetermined repulsive force and the second SMA elastic body has a predetermined repulsive force, so that the lens support portion is held at a predetermined position.

7. The lens driving device for auto-focusing according to claim 3, wherein the base portion has a bottom wall and a side wall, the bottom wall and the side wall enclosing the space for accommodating the lens support portion;

the first fixing part and the second fixing part are both cylinders, and are arranged on the bottom wall of the base part and extend along the direction of an optical axis;

the length of the first fixing part is greater than that of the second fixing part.

8. The lens driving device for auto-focusing according to claim 7, wherein a first electrode is provided at a tip of the first fixing portion, and a second electrode is provided at a tip of the second fixing portion, the first electrode receiving an external current to energize the first SMA elastomer, and the second electrode suit receiving an external current to energize the second SMA elastomer.

9. The lens driving device for auto-focusing according to claim 3, wherein the distance between the axis of the first fixing portion and the axis of the second fixing portion provided at the same corner portion and the central axis of the lens support portion is equal.

10. The lens driving device for auto-focusing according to claim 3, wherein the middle portion of the first SMA elastic body and the first end surface at the corresponding position of the lens support portion have matching shapes;

the middle part of the second SMA elastomer and the second end surface at the corresponding position of the lens supporting part have matching shapes.