CN111103670B - Actuator with auto-focusing function and optical image stabilization function - Google Patents
Actuator with auto-focusing function and optical image stabilization function Download PDFInfo
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- CN111103670B CN111103670B CN202010019541.4A CN202010019541A CN111103670B CN 111103670 B CN111103670 B CN 111103670B CN 202010019541 A CN202010019541 A CN 202010019541A CN 111103670 B CN111103670 B CN 111103670B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 98
- 230000006641 stabilisation Effects 0.000 title claims abstract description 41
- 238000011105 stabilization Methods 0.000 title claims abstract description 41
- 230000006870 function Effects 0.000 claims abstract description 87
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 71
- 239000000463 material Substances 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/105—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens with movable lens means specially adapted for focusing at close distances
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Adjustment Of Camera Lenses (AREA)
Abstract
The present invention provides an actuator having an auto-focus function and an optical image stabilization function, comprising: the optical anti-shake module comprises a first base, a second base and a shape memory alloy wire, wherein a first fixing part is arranged on the first base, a second fixing part is arranged on the second base, a first end of the shape memory alloy wire is fixedly connected with the first fixing part, and a second end of the shape memory alloy wire is fixedly connected with the second fixing part; the automatic focusing module is arranged on the second base; when the shape memory alloy wire is electrified, the second base moves in the horizontal direction perpendicular to the optical axis direction of the actuator, and the second base drives the automatic focusing module to move in the horizontal direction.
Description
Technical Field
The invention belongs to the technical field of actuators, and particularly relates to an actuator with an automatic focusing function and an optical image stabilizing function.
Background
In general, as the sharpness and magnification of an image photographed by a device having a photographing function such as a camera or a cellular phone are improved, OIS (Optical image stabilization, optical anti-shake) function for correcting camera shake and vibration at the time of telephoto by the device having a photographing function such as a camera or a cellular phone requires more complicated camera shake and vibration tracking capability.
On the other hand, an af+ois actuator in which two types of actuators, OIS and AF (Auto Focus), are combined has a complicated structure and a large number of parts, and if OIS and AF units are integrated, the yield of the qualified product increases, and the manufacturing cost increases.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides an actuator having an auto-focusing function and an optical image stabilization function. According to the actuator having an auto-focus function and an optical image stabilization function of the present invention, the structure of the actuator can be effectively simplified, and a stable optical anti-shake function and an auto-focus function can be realized.
The actuator with the automatic focusing function and the optical image stabilizing function is realized by the following technical scheme.
The actuator with auto-focusing function and optical image stabilization function of the present invention includes: the optical anti-shake module comprises a first base, a second base and a shape memory alloy wire, wherein a first fixing part is arranged on the first base, a second fixing part is arranged on the second base, a first end of the shape memory alloy wire is fixedly connected with the first fixing part, and a second end of the shape memory alloy wire is fixedly connected with the second fixing part; the automatic focusing module is arranged on the second base; when the shape memory alloy wire is electrified, the second base moves in the horizontal direction perpendicular to the optical axis direction of the actuator, and the second base drives the automatic focusing module to move in the horizontal direction.
According to an actuator having an auto-focusing function and an optical image stabilization function according to at least one embodiment of the present invention, a first base has one bottom wall and four side walls, forming a space accommodating a second base; the second base also has a bottom wall and four side walls forming a space for receiving the autofocus module.
According to the actuator with an auto-focusing function and an optical image stabilization function of at least one embodiment of the present invention, the number of shape memory alloy wires is eight, the number of first fixing portions is four, and the number of second fixing portions is eight; the four first fixing parts are respectively arranged at four corners of the first base; two second fixing parts are respectively arranged on four outer side surfaces of the second base, the two second fixing parts on each outer side surface of the second base are respectively arranged at two edge positions of the outer side surface, the two second fixing parts have different extension sizes perpendicular to the outer side surface, the two edge positions are respectively close to two corner parts of the second base, and the two second fixing parts on each outer side surface are not staggered along the optical axis direction; two strip-shaped memory alloy wires are arranged between each outer side face of the second base and the opposite inner side face of the first base, the first end of each strip-shaped memory alloy wire is connected with one first fixing portion, each first fixing portion is connected with the first ends of the two strip-shaped memory alloy wires, the second end of each strip-shaped memory alloy wire is fixedly connected with one second fixing portion, and the two strip-shaped memory alloy wires arranged between each outer side face of the second base and the opposite inner side face of the first base are arranged in a non-staggered mode along the optical axis direction.
According to the actuator with an auto-focusing function and an optical image stabilization function of at least one embodiment of the present invention, the number of shape memory alloy wires is eight, the number of first fixing portions is four, and the number of second fixing portions is eight; the four first fixing parts are respectively arranged at four corners of the first base; two second fixing parts are respectively arranged on four outer side surfaces of the second base, the two second fixing parts on each outer side surface of the second base are respectively arranged at two edge positions of the outer side surface, the two second fixing parts have the same extension dimension perpendicular to the outer side surface, the two edge positions are respectively close to two corner parts of the second base, and the two second fixing parts on each outer side surface are staggered along the optical axis direction; two strip-shaped memory alloy wires are arranged between each outer side face of the second base and the opposite inner side face of the first base, the first end of each strip-shaped memory alloy wire is connected with one first fixing portion, each first fixing portion is connected with the first ends of the two strip-shaped memory alloy wires, the second end of each strip-shaped memory alloy wire is fixedly connected with one second fixing portion, and the two strip-shaped memory alloy wires arranged between each outer side face of the second base and the opposite inner side face of the first base are staggered along the optical axis direction.
The actuator having an auto-focusing function and an optical image stabilization function according to at least one embodiment of the present invention further includes a guide sphere disposed between a bottom wall of the second base and a bottom wall of the first base for guiding movement of the second base relative to the first base.
According to the actuator having an auto-focusing function and an optical image stabilization function of at least one embodiment of the present invention, the number of guide spheres is three, wherein two guide spheres are respectively disposed at two adjacent corners of the second base, and a third guide sphere is disposed at an intermediate position of the bottom side that is not adjacent to both of the adjacent corners.
According to the actuator having an auto-focusing function and an optical image stabilization function of at least one embodiment of the present invention, the first fixing portion is a cylinder extending from a bottom wall of the first base in the optical axis direction, and the second fixing portion is a convex portion extending from a side wall of the second base outward.
According to the actuator having an auto-focusing function and an optical image stabilization function of at least one embodiment of the present invention, the extension length of the first fixing portion is not greater than the length of the side wall of the first base in the optical axis direction.
According to an actuator having an auto-focusing function and an optical image stabilization function according to at least one embodiment of the present invention, an auto-focusing module includes: a lens support portion for supporting at least one lens and moving in an optical axis direction of the lens to perform focusing; two sets of driving devices, each set of driving device comprising a permanent magnet, a coil and a magnetic plate, the driving devices being used for moving the lens support part to the focal position of the lens in the optical axis direction; a guide ball guiding movement of the lens support part; and a frame for supporting the lens supporting part, the two sets of driving devices and the guide balls.
According to the actuator having an auto-focusing function and an optical image stabilization function in at least one embodiment of the present invention, permanent magnets are disposed on two adjacent outer sides of a lens support portion, respectively, and magnetic circuits each composed of a coil and a magnetic plate are disposed on two adjacent inner sides of a frame body at positions facing the permanent magnets, respectively.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is one of cross-sectional views of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention.
Fig. 2 is one of cross-sectional views of an auto-focus module of an actuator having an auto-focus function and an optical image stabilization function according to one embodiment of the present invention.
Fig. 3 is a second cross-sectional view of an autofocus module of an actuator having an autofocus function and an optical image stabilization function according to one embodiment of the invention.
Fig. 4 is a second cross-sectional view of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention.
Fig. 5 is a cross-sectional view of an actuator having an auto-focusing function and an optical image stabilization function according to one embodiment of the present invention.
Fig. 6 is one of control diagrams of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention.
Fig. 7 is a second control schematic of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention.
Description of the reference numerals
1. Actuator with auto-focusing function and optical image stabilization function
10. Optical anti-shake module
101. First base
102. Second base
103. Guide sphere
104. Second fixing part
1041. One of the second fixing parts
1042. Second fixing part
105. First fixing part
1051. One of the first fixing parts
1052. Two first fixing parts
1053. Third of the first fixing portion
1054. Fourth of the first fixing portion
106. Shape memory alloy wire
1061. One of the shape memory alloy wires
1062. Two-wire shape memory alloy wire
107. A first hollow part
20. Automatic focusing module
201. Frame body
202. Lens support
203. A second hollow part
204. Magnetic plate
205. Flexible circuit board
206. Coil
207. Guide ball
2071. First group of guide balls
2072. Second group of guiding balls
208. Permanent magnets.
Detailed Description
The present invention 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 merely illustrative of the substances, and not restrictive of the invention. It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. The technical scheme of the present invention will be described in detail below with reference to the accompanying drawings in combination with embodiments.
Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some of the ways in which the technical concepts of the present invention may be practiced. Thus, unless otherwise indicated, the features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present invention.
The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.
When an element is referred to as being "on" or "over", "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 this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.
For descriptive purposes, the invention may use spatially relative terms such as "under … …," under … …, "" under … …, "" lower, "" over … …, "" upper, "" over … …, "" upper "and" side (e.g., as in "sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below … …" may encompass both an orientation of "above" and "below". Furthermore, the device 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 one of cross-sectional views of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention.
Fig. 5 is a cross-sectional view of an actuator having an auto-focusing function and an optical image stabilization function according to one embodiment of the present invention.
Referring to fig. 1 and 5, fig. 1 and 5 are each a view in the optical axis direction, which is perpendicular to the paper surface. An actuator 1 having an auto-focusing function and an optical image stabilization function according to an embodiment of the present invention includes: the optical anti-shake module 10, the optical anti-shake module 10 includes a first base 101, a second base 102, and a shape memory alloy wire 106 (i.e., SMA wire), the first base 101 is provided with a first fixing portion 105, the second base 102 is provided with a second fixing portion 104, a first end of the shape memory alloy wire 106 is fixedly connected with the first fixing portion 105, and a second end of the shape memory alloy wire 106 is fixedly connected with the second fixing portion 104; and the automatic focusing module 20 is arranged on the second base 102, when the shape memory alloy wire 106 is electrified, the second base 102 moves in the horizontal direction perpendicular to the optical axis direction of the actuator, and the second base 102 drives the automatic focusing module 20 to move in the horizontal direction.
As can be seen from fig. 1, the first base 101 has four corners and the second base 102 has four corners. The first base 101 and the second base 102 have matching shapes, each having a square shape.
Preferably, the middle positions of the first base 101 and the second base 102 of the optical anti-shake module 10 are preferably provided with a first hollow 107, and the first hollow 107 is capable of allowing a lens to pass through.
Fig. 4 is a second cross-sectional view of an optical anti-shake module of an actuator having an auto-focus function and an optical image stabilization function according to an embodiment of the invention. Fig. 4 is a side view of the optical anti-shake module shown in fig. 1.
Referring to fig. 1 and 4, the first base 101 preferably has a bottom wall and four side walls, forming a space for receiving the second base 102; the second base 102 also has a bottom wall and four side walls forming a space (e.g., a semi-enclosed space formed by a dashed line in fig. 4) for accommodating the autofocus module 20. The first fixing portion 105 of the first base 101 is located between the inside of the sidewall of the first base 101 and the outside of the sidewall of the second base 102.
Referring to fig. 1, 4 and 5, it is preferable that the actuator 1 having an auto-focusing function and an optical image stabilization function further includes a guide sphere 103, the guide sphere 103 being disposed between a bottom wall of the second base 102 and a bottom wall of the first base 101 for guiding movement of the second base 102 relative to the first base 101. By guiding the rolling of the sphere 103, the second pedestal 102 can be smoothly moved relative to the first pedestal 101 by the shape memory alloy wire 106.
Preferably, the number of the guide spheres 103 is three, wherein two guide spheres 103 are respectively disposed at two adjacent corners of the second base 102, and a third guide sphere 103 is disposed at an intermediate position of the bottom side not adjacent to both adjacent corners.
As shown in fig. 1 and 4, it is preferable that the first fixing portion 105 provided on the first base 101 is a column extending from the bottom wall of the first base 101 in the optical axis direction, and the second fixing portion 104 provided on the second base 102 is a convex portion extending outward from the side wall of the second base 102.
Preferably, as shown in fig. 4, the extension length of the first fixing portion 105 is not greater than the length of the side wall of the first base 101 in the optical axis direction. The extension length of the first fixing portion 105 is smaller than the length of the side wall of the first base 101 in the optical axis direction, and the extension length of the first fixing portion 105 is also smaller than the length of the side wall of the second base 102 in the optical axis direction. More preferably, the length of the side wall of the first base 101 in the optical axis direction is the same as the length of the side wall of the second base 102 in the optical axis direction.
According to an actuator having an auto-focusing function and an optical image stabilization function of a preferred embodiment of the present invention, the number of shape memory alloy wires 106 of the actuator 1 having an auto-focusing function and an optical image stabilization function is eight, the number of the first fixing portions 105 is four, and the number of the second fixing portions 104 is eight, referring to fig. 1, 4, and 5; four first fixing portions 105 are provided at four corners of the first base 101, respectively; two second fixing portions 104 are respectively arranged on four outer side surfaces of the second base 102, the two second fixing portions 104 on each outer side surface of the second base 102 are respectively arranged at two edge positions of the outer side surface, the two second fixing portions 104 have different extending dimensions perpendicular to the outer side surface, the two edge positions are respectively close to two corner portions of the second base 102, and the two second fixing portions 104 on each outer side surface are not staggered along the optical axis direction; two strip-shaped memory alloy wires 106 are arranged between each outer side surface of the second base 102 and the opposite inner side surfaces of the first base 101, the first end of each strip-shaped memory alloy wire 106 is connected with one first fixing part 105, each first fixing part 105 is connected with the first ends of the two strip-shaped memory alloy wires 106, the second end of each strip-shaped memory alloy wire 106 is fixedly connected with one second fixing part 104, and the two strip-shaped memory alloy wires 106 arranged between each outer side surface of the second base 102 and the opposite inner side surfaces of the first base 101 are arranged in a non-staggered mode along the optical axis direction.
As shown in fig. 1, four first fixing portions 1051, 1052, 1053, 1054 are sequentially disposed in a counterclockwise direction and are disposed at four corners of the first base 101, respectively, and in a direction perpendicular to the sidewall surface of the first base 101, the first fixing portions 1051 are disposed offset from the first fixing portions 1052, the first fixing portions 1052 are disposed offset from the first fixing portions 1053, the first fixing portions 1053 are disposed offset from the first fixing portions 1054, and the first fixing portions 1054 are disposed offset from the first fixing portions 1051.
The first fixing portions 1051 and 1053 are spaced apart from the optical axis by a first distance, and the first fixing portions 1052 and 1054 are spaced apart from the optical axis by a second distance, the first distance being greater than the second distance.
Taking the right portion of fig. 1 as an example, the two second fixing portions 1041, 1042 between the first fixing portion 1051 and the first fixing portion 1052 have different extension dimensions perpendicular to the outer side surface of the second base 102, the second fixing portion 1041 has a first extension dimension, and the second fixing portion 1042 has a second extension dimension, and the first extension dimension is smaller than the second extension dimension.
The shape memory alloy wire 1061 has a first end connected to the first fixing portion 1051 and a second end connected to the second fixing portion 1042, and the shape memory alloy wire 1062 has a first end connected to the first fixing portion 1052 and a second end connected to the second fixing portion 1041 through the second fixing portion 1042.
The first fixing portion 1051 is adjacent to the second fixing portion 1041, and the first fixing portion 1052 is adjacent to the second fixing portion 1042.
The left part, the upper part and the lower part of fig. 1 are similar to the right part of fig. 1 in that a first fixing part, a second fixing part and a shape memory alloy wire are provided, and a detailed description is omitted.
As an alternative preferred embodiment, the number of the shape memory alloy wires 106 is four, and the two shape memory alloy wires 106 connected to each of the first fixing portions 105 described above are replaced with one shape memory alloy wire (the embodiment shown in fig. 1 is a four-bar shape memory alloy wire).
According to an actuator having an auto-focusing function and an optical image stabilization function of still another preferred embodiment of the present invention, the number of shape memory alloy wires 106 is eight, the number of first fixing portions 105 is four, and the number of second fixing portions 104 is eight; four first fixing portions 105 are provided at four corners of the first base 101, respectively; two second fixing portions 104 are respectively disposed on four outer side surfaces of the second base 102, the two second fixing portions 104 on each outer side surface of the second base 102 are respectively disposed at two edge positions of the outer side surface, the two second fixing portions 104 have the same extension dimension perpendicular to the outer side surface (the embodiment is not shown in the figure), the two edge positions are respectively close to two corner portions of the second base 102, and the two second fixing portions 104 on each outer side surface are disposed in a staggered manner along the optical axis direction (the embodiment is not shown in the figure); two strip-shaped memory alloy wires 106 are disposed between each outer side surface of the second base 102 and the opposite inner side surface of the first base 101, a first end of each strip-shaped memory alloy wire 106 is connected to one first fixing portion 105, each first fixing portion 105 is connected to the first ends of the two strip-shaped memory alloy wires 106, a second end of each strip-shaped memory alloy wire 106 is fixedly connected to one second fixing portion 104, and the two strip-shaped memory alloy wires 106 disposed between each outer side surface of the second base 102 and the opposite inner side surface of the first base 101 are disposed in a staggered manner along the optical axis direction (this embodiment is not shown in the drawing).
The actuator with an auto-focusing function and an optical image stabilization function of this embodiment will further save space between the side wall of the first base 101 and the side wall of the second base 102.
Fig. 2 is one of cross-sectional views of an auto-focus module of an actuator having an auto-focus function and an optical image stabilization function according to one embodiment of the present invention.
Fig. 3 is a second cross-sectional view of an autofocus module of an actuator having an autofocus function and an optical image stabilization function according to one embodiment of the invention.
Fig. 2 is a view in the optical axis direction, which is perpendicular to the paper surface. Fig. 3 is a side view of the autofocus module 20 shown in fig. 2.
Referring to fig. 2 and 3, the auto-focusing module 20 includes: a lens support section 202, the lens support section 202 being for supporting at least one lens and moving in an optical axis direction of the lens to perform focusing; two sets of driving means, each set of driving means including a permanent magnet 208, a coil 206, and a magnetic plate 204, for moving the lens support 202 to a focal position of the lens in the optical axis direction; a guide ball 207, the guide ball 207 guiding the movement of the lens support 202; and a housing 201, wherein the housing 201 is used for supporting the lens supporting part 202, the two sets of driving devices and the guide balls 207.
Preferably, a second hollow 203 is formed at a central position of the lens support 202 of the auto-focus module 20, the second hollow 203 being capable of being used to dispose a lens such that the lens is supported by the lens support 202, the frame 201 being disposed at an outer periphery of the lens support 202, the guide ball 207 guiding the lens support 202 to move relative to the frame 201 along the optical axis direction.
Preferably, permanent magnets 208 are disposed on two adjacent outer surfaces of the lens support 202, and magnetic circuits each composed of a coil 206 and a magnetic plate 204 are disposed at positions facing the permanent magnets 208 on two adjacent inner surfaces of the housing 201.
Taking the first set of driving means at the left part of fig. 2 as an example, the permanent magnets 208 of the first set of driving means are arranged on the outer side surface of the lens support part 202, e.g. embedded on the outer side surface of the lens support part 202. The coil 206 is provided on the inner side surface of the housing 201.
Wherein the coil 206 is disposed opposite to the permanent magnet 208 so that a magnetic field generated when the coil 206 is energized interacts with a magnetic field of the permanent magnet 208, thereby causing the lens support 202 provided with the permanent magnet 208 to move in the optical axis direction of the lens, thereby realizing a focusing function.
The magnetic plate 204 is provided on the frame 201, and the magnetic plate 204 and the permanent magnet 208 are provided on both sides of the coil 20, respectively. Preferably, a magnetic attraction force is generated between the magnetic plate 204 and the permanent magnet 208.
A flexible circuit board 205 is disposed between the magnetic plate 204 and the coil 206. The flexible circuit board 205 supplies a control signal, a driving current, and the like to the coil 206.
The second set of driving means is arranged on a side (e.g. the lower part shown in fig. 2) of the autofocus module 20 adjacent to the side (the left part shown in fig. 2) where the first set of driving means is arranged, the specific arrangement of the second set of driving means being the same as the first set of driving means.
Preferably, the first set of drivers and the second set of drivers share a flexible circuit board 205.
The guide ball 207 is provided at a corner between the first driving device and the second driving device, and the guide ball 207 is sandwiched by a corner of the frame 201 and a corner of the lens support 202.
The guide balls 207 preferably comprise two sets of guide balls, namely a first set of guide balls 2071 and a second set of guide balls 2072.
Preferably, the first group of guide balls 2071 and the second group of guide balls 2072 each include three guide balls, and as shown in fig. 3, the three guide balls of the first group of guide balls 2071 are arranged in the optical axis direction and the three guide balls of the second group of guide balls 2072 are arranged in the optical axis direction.
Preferably, the middle ball of the three guide balls of the first set of guide balls 2071 is smaller in size than the other two guide balls (upper and lower balls) which have the same size.
The middle ball of the three guide balls of the second group of guide balls 2072 has a smaller size than the other two guide balls (the upper ball and the lower ball) which have the same size.
The upper balls of the first set of guide balls 2071 are the same size as the upper balls of the second set of guide balls 2072.
The intermediate balls of the first set of guide balls 2071 are the same size as the intermediate balls of the second set of guide balls 2072.
The lower balls of the first set of guide balls 2071 are the same size as the lower balls of the second set of guide balls 2072.
Wherein the upper ball and the lower ball are in contact with the respective contact surfaces, thereby ensuring smooth sliding of the lens supporting portion 201 in the optical axis direction, and the intermediate ball can ensure smooth sliding between the upper ball and the lower ball.
The control principle of the actuator with an auto-focusing function and an optical image stabilization function of the present invention is further described below with reference to fig. 6 and 7.
In fig. 6, the horizontal direction along the paper surface is the X direction, the vertical direction along the paper surface is the Y direction, and the vertical direction is perpendicular to the paper surface and extends outward from the paper surface to be the Z direction.
A. b, C, D, E, F, G, H are switches.
When the switch E, G is turned on, the other switches are turned off, as shown in fig. 6, the shape memory alloy wire of the loop in which the switch E is located is contracted, and the shape memory alloy wire of the loop in which the switch G is located is contracted, so that the second base 102 moves in the direction of the arrow shown in the figure, i.e., moves in the x+ direction.
When switch A, C is closed, the other switches are opened, as shown in fig. 6, the shape memory alloy wire of the loop in which switch a is located is contracted, and the shape memory alloy wire of the loop in which switch C is located is contracted, so that the second base 102 moves in the direction of the arrow shown in the figure, i.e., moves in the X-direction.
When the switch B, D is turned on, the other switches are turned off, as shown in fig. 6, the shape memory alloy wire of the loop in which the switch B is located is contracted, and the shape memory alloy wire of the loop in which the switch D is located is contracted, so that the second base 102 moves in the direction of the arrow shown in the figure, that is, moves in the y+ direction.
When switch F, H is closed, the other switches are opened, as shown in fig. 6, the shape memory alloy wire of the loop in which switch F is located is contracted, and the shape memory alloy wire of the loop in which switch H is located is contracted, so that second base 102 moves in the direction of the arrow shown, i.e., moves in the Y-direction.
When the switch B, C, E, H is turned on, the other switches are turned off, as shown in fig. 6, the shape memory alloy wire of the loop where the switch B is located is contracted, the shape memory alloy wire of the loop where the switch C is located is contracted, and the shape memory alloy wire of the loop where the switch E is located is contracted, so that the second base 102 is rotated clockwise, i.e., rotated rightward.
When the switch A, D, F, G is turned on, the other switches are turned off, as shown in fig. 6, the shape memory alloy wire of the loop in which the switch a is located is contracted, the shape memory alloy wire of the loop in which the switch D is located is contracted, and the shape memory alloy wire of the loop in which the switch F is located is contracted, so that the second base 102 is rotated in the counterclockwise direction, i.e., rotated to the left.
The auto-focusing module 20 is driven by the second base 102 to move in the x+ direction, the X-direction, the y+ direction, the Y-direction, the clockwise direction, and the counterclockwise direction.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner 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/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present invention.
Claims (5)
1. An actuator having an auto-focus function and an optical image stabilization function, comprising:
The optical anti-shake module comprises a first base, a second base and a shape memory alloy wire, wherein a first fixing part is arranged on the first base, a second fixing part is arranged on the second base, a first end of the shape memory alloy wire is fixedly connected with the first fixing part, and a second end of the shape memory alloy wire is fixedly connected with the second fixing part; and
The automatic focusing module is arranged on the second base;
When the shape memory alloy wire is electrified, the second base moves in the horizontal direction perpendicular to the optical axis direction of the actuator, the second base drives the automatic focusing module to move in the horizontal direction,
The first base is provided with a bottom wall and four side walls, and a space for accommodating the second base is formed; the second base also has a bottom wall and four side walls, forming a space for accommodating the autofocus module,
The number of the shape memory alloy wires is eight, the number of the first fixing parts is four, and the number of the second fixing parts is eight; the four first fixing parts are respectively arranged at four corners of the first base; two second fixing parts are respectively arranged on four outer side surfaces of the second base, the two second fixing parts on each outer side surface of the second base are respectively arranged at two edge positions of the outer side surface, the two second fixing parts have the same extension dimension vertical to the outer side surface, the two edge positions are respectively close to two corner parts of the second base, and the two second fixing parts on each outer side surface are staggered along the optical axis direction; two strip-shaped memory alloy wires are arranged between each outer side surface of the second base and the opposite inner side surface of the first base, the first end of each strip-shaped memory alloy wire is connected with a first fixing part, each first fixing part is connected with the first ends of the two strip-shaped memory alloy wires, the second end of each strip-shaped memory alloy wire is fixedly connected with a second fixing part, the two strip-shaped memory alloy wires arranged between each outer side surface of the second base and the opposite inner side surface of the first base are staggered along the optical axis direction,
The first fixing part is a cylinder extending from the bottom wall of the first base along the optical axis direction, the second fixing part is a convex part extending from the side wall of the second base outwards, and the extending length of the first fixing part is not greater than the length of the side wall of the first base along the optical axis direction.
2. The actuator with auto-focus and optical image stabilization functions according to claim 1, further comprising a guide sphere disposed between a bottom wall of the second base and a bottom wall of the first base for guiding movement of the second base relative to the first base.
3. The actuator with an auto-focusing function and an optical image stabilization function according to claim 2, wherein the number of the guide spheres is three, two of the guide spheres being disposed at two adjacent corners of the second base, respectively, and a third guide sphere being disposed at an intermediate position of a bottom edge not adjacent to both of the two adjacent corners.
4. The actuator with an autofocus function and an optical image stabilization function according to claim 1, wherein the autofocus module comprises:
A lens support portion for supporting at least one lens and moving in an optical axis direction of the lens to perform focusing;
two sets of driving devices each including a permanent magnet, a coil, and a magnetic plate, the driving devices being configured to move the lens supporting portion to a focal position of the lens in an optical axis direction;
a guide ball guiding movement of the lens support part; and
And the frame body is used for supporting the lens supporting part, the two groups of driving devices and the guide balls.
5. The actuator with an auto-focusing function and an optical image stabilization function according to claim 4, wherein the permanent magnets are disposed on two adjacent outer sides of the lens supporting portion, respectively, and magnetic circuits composed of the coil and the magnetic plate are disposed at positions of two adjacent inner sides of the frame body opposite to the permanent magnets, respectively.
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| CN111596432B (en) * | 2020-06-22 | 2021-07-06 | 睿恩光电有限责任公司 | Piezoelectric optical anti-shake device, camera device, and electronic apparatus |
| CN114245001B (en) * | 2020-09-09 | 2023-12-29 | 北京小米移动软件有限公司 | Camera module and terminal equipment |
| CN112360709A (en) * | 2020-11-12 | 2021-02-12 | 东莞市亚登电子有限公司 | Rotary actuating structure, actuator and camera module |
| CN114488459A (en) * | 2020-11-13 | 2022-05-13 | 华为技术有限公司 | Voice coil motor, camera module and electronic equipment |
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| CN110603487A (en) * | 2017-05-04 | 2019-12-20 | 艾斯科技公司 | Camera module autofocus actuator |
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| GB2457860B (en) * | 2007-02-12 | 2010-06-30 | Cambridge Mechatronics Ltd | Shape memory alloy actuation apparatus |
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| CN110603487A (en) * | 2017-05-04 | 2019-12-20 | 艾斯科技公司 | Camera module autofocus actuator |
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