CN111856694A - Zoom lens assembly and electronic equipment applying same - Google Patents
Zoom lens assembly and electronic equipment applying same Download PDFInfo
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- CN111856694A CN111856694A CN202010827064.4A CN202010827064A CN111856694A CN 111856694 A CN111856694 A CN 111856694A CN 202010827064 A CN202010827064 A CN 202010827064A CN 111856694 A CN111856694 A CN 111856694A
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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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0875—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements
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Abstract
The embodiment of the invention discloses a variable-focus lens assembly and electronic equipment applying the same, wherein the variable-focus lens assembly comprises a shell, an elastic sheet, a first lens and at least one electrostrictive element, wherein the shell is provided with a flange; the electric deformation element is fixed on the deformable part and extends along a spiral line around the first lens, and voltage is applied to the electric deformation element to enable the inner side end and the outer side end of the electric deformation element to generate relative displacement, so that the elastic sheet deforms and drives the first lens to move axially to achieve zooming. Therefore, the variable-focus lens assembly provided by the embodiment of the invention has the advantages of simple structure, small occupied space, strong driving force and capability of realizing accurate focusing.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to a variable-focus lens assembly and electronic equipment applying the same.
Background
The lens assembly requires zooming by moving the lens. The traditional full-mechanical focusing adopts manual rotation of a lens focusing ring to zoom, and the zooming mode can only be applied to a lens assembly with a larger volume due to manual operation, and manual adjustment is very inconvenient. In order to more conveniently perform zooming, it is desirable to perform zooming by an electric method. The conventional electric zoom mode usually adopts a motor to drive the lens to move, but the conventional electric zoom mode has high cost and large thickness, and is not beneficial to the miniaturization of the lens assembly and corresponding electronic equipment.
Disclosure of Invention
In view of this, embodiments of the present invention provide a variable focus lens assembly and an electronic device using the same, which have a simple structure, a small volume, and a wide application range.
In a first aspect, an embodiment of the present invention provides a variable focus lens assembly, including:
a housing having a flange;
the elastic sheet is provided with a mounting hole in the middle, a deformable part is arranged on the periphery of the mounting hole, and the edge of the deformable part is fixedly connected with the flange;
the first lens is fixed in the mounting hole; and
at least one electrostrictive element fixed to the deformable portion, the electrostrictive element extending around the first lens along a spiral line, the electrostrictive element being configured to be deformed by voltage excitation, causing relative displacement between an inner end and an outer end of the electrostrictive element.
Further, the distance between the point on the spiral line and the center of the mounting hole gradually increases from the inner end to the outer end.
Further, the elastic sheet is configured to be in a flat state when the electrically deformable element is not applied with a voltage.
Further, the center of the spiral line is aligned with the optical axis of the first lens.
Further, the variable focus lens assembly further comprises a light sensing element fixed to one side of the first lens, and the first lens is configured to guide light to the light sensing element.
Further, the variable focus lens assembly further comprises:
a control circuit configured to apply a voltage to the electro-deformation element according to an output signal of the light sensing element.
Further, the variable focus lens assembly further comprises:
a positioning structure configured to position the photosensitive element.
Further, the electric deformation element is a continuous whole, or the electric deformation element comprises a plurality of deformation units arranged along the spiral line.
Furthermore, the variable focus lens assembly comprises two electrostrictive elements, and the two electrostrictive elements are respectively fixed on two sides of the elastic sheet.
Further, the variable focus lens assembly comprises two electro-deformable elements, which are centrosymmetric to each other and do not intersect.
Further, the housing also has a fixing hole aligned with the first lens, and the variable focus lens assembly also includes a second lens fixed to the fixing hole.
Further, the elastic sheet is made of a polymer material or a metal material.
In a second aspect, embodiments of the present invention also provide an electronic device, including at least one variable focus lens assembly as described in the first aspect.
The embodiment of the invention provides a variable-focus lens assembly and electronic equipment applying the same, wherein the variable-focus lens assembly comprises a shell, an elastic sheet, a first lens and at least one electrostrictive element, wherein the shell is provided with a flange; the electric deformation element is fixed on the deformable part and extends along a spiral line around the first lens, and voltage is applied to the electric deformation element to enable the inner side end and the outer side end of the electric deformation element to generate relative displacement, so that the elastic sheet deforms and drives the first lens to move axially to achieve zooming. Therefore, the variable-focus lens assembly provided by the embodiment of the invention has the advantages of simple structure, small occupied space, strong driving force and capability of realizing accurate focusing.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic perspective view of a variable focus lens assembly according to a first embodiment of the present invention;
fig. 2 is a top view of a variable focus lens assembly of a first embodiment of the present invention;
fig. 3 is a cross-sectional view of a variable focus lens assembly of a first embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an operating state of a variable focus lens assembly according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of an operating state of a variable focus lens assembly according to the first embodiment of the present invention;
fig. 6 is a top view of another variable focus lens assembly of the first embodiment of the invention;
fig. 7 is a cross-sectional view of a further variable focus lens arrangement of the first embodiment of the invention;
fig. 8 is a cross-sectional view of a variable focus lens assembly of a second embodiment of the invention;
fig. 9 is a top view of a variable focus lens assembly of a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention.
Description of reference numerals:
1-a shell; 11-a flange; 12-a fixation hole; 2-an elastic sheet; 3-a first lens; 41-an electro-deformable element; 41 a-deformation unit; 41 b-a deformation unit; 42-an electro-deformable element; 43-an electro-deformable element; 44-an electro-deformable element; 45-an electro-deformable element; 5-a photosensitive element; 6-a second lens; a-a variable focus lens assembly; b-machine shell.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 to fig. 3 are a schematic perspective view, a top view and a cross-sectional view of a variable focus lens assembly according to the present embodiment. As shown in fig. 1 to 3, the variable focus lens assembly of the present embodiment includes a housing 1, an elastic sheet 2, a first lens 3, and at least one electro-deformable element 41. The housing 1 has a flange 11. The middle part of the elastic sheet 2 is provided with a mounting hole, and the first lens 3 is fixed in the mounting hole. The periphery of the mounting hole has a deformable portion, the outer edge of which is fixed to the flange 11. An electro-deformable element 41 is fixed to the deformable portion and the electro-deformable element 41 extends helically around the first lens 3. The electro-deformation element 41 is excited by voltage to deform, so that the inner end and the outer end of the electro-deformation element 41 generate relative displacement, and the elastic sheet 2 deforms, thereby driving the first lens 3 to move.
The outer shape of the housing 1 may be formed in any shape, such as a cylinder, a cube or other shape suitable for use, and may generally be designed accordingly to the space in which the variable focus lens assembly is to be installed. The contour edge of the lens is usually circular, and the shape of the shell 1 can also be formed into a circular ring, a hollow cylinder and the like, so that the overall strength of the shell 1 can be improved, and the overall size of the variable-focus lens assembly can be reduced. For example, the housing 1 in this embodiment may be a hollow cylinder with an opening in the axial direction, one end of the housing 1 has a substantially annular flange 11 protruding from the bottom surface, and the height of the flange 11 matches with a predetermined distance range of the first lens 3 moving in the axial direction, so as to provide sufficient space for the first lens 3 to move. The edges of the deformable portion of the flexible sheet 2 are fixed to the flanges 11 by means including, but not limited to, gluing, welding, etc. The flange 11 may be a continuous piece or may comprise several parts with gaps between them, so as to be able to fix the edges of the elastic strip 2 well. In order to avoid the influence of the unbalanced air pressure inside and outside the shell 1 on the normal operation of the variable focus lens assembly after the elastic sheet 2 is connected with the shell 1, the shell 1 can be further provided with air holes.
The elastic sheet 2 is made of a material with good elasticity and certain mechanical strength. The elasticity refers to the property that an object can recover the original size and shape after being deformed. In this application, the elasticity of the elastic sheet means that the elastic sheet can be restored to its original size and shape after the external force is removed when the elastic sheet is subjected to the external force applied by the electrostrictive element within a predetermined range. Since the elastic limit of the object is temperature dependent, the material of the flexible sheet 2 should be selected to ensure that the flexible sheet 2 is elastically deformed by an amount sufficient to move the first lens 3 within the required distance within the normal operating temperature range of the variable focus lens assembly. Alternatively, the elastic sheet 2 may be a sheet made of a polymer material (e.g., a sheet made of a thermoplastic elastomer material) or a metal sheet (e.g., a copper-based alloy sheet, a stainless steel sheet, etc.). The term "sheet" or "lamina" refers to a structure having a thickness dimension that is much smaller than the dimensions in the other two directions. The thickness of the elastic sheet 2 may be uniform, or the thickness may be set to be different at different positions as needed, for example, the thickness of the middle portion of the elastic sheet 2 is set to be greater than that of the outer edge, the thickness of the middle portion of the elastic sheet 2 is set to be less than that of the outer edge, and so on.
The elastic sheet 2 may be formed into a suitable shape, such as a rectangle, a circle, an ellipse, or the like, according to the setting scene of the variable focus lens assembly and the shapes of the housing 1 and the flange 11. In the present embodiment, the elastic sheet 2 is formed in a circular shape, and the tension of the elastic sheet 2 can be made uniform.
The middle part of the elastic piece 2 is provided with a mounting hole, and the size of the mounting hole is adapted to the size of the first lens 3. Preferably, the mounting hole is concentric with the circular elastic sheet 2, so that the optical axis deflection of the first lens 3 during zooming caused by the unbalanced deformation of the deformable part can be avoided, and the imaging effect is prevented from being influenced. The first lens 3 may be secured to the mounting hole by adhesive, welding, fastener attachment, or other means.
Preferably, as shown in fig. 3, when the electrostrictive element 41 is not applied with a voltage, the deformable portion of the elastic sheet 2 is in a flattened state, so as to avoid affecting the position of the first lens 3 and thus the stability of the imaging due to the different placement postures of the variable focus lens assembly. Therefore, when the elastic sheet 2 is installed between the housing 1 and the first lens 3, the elastic sheet 2 should have a certain pretension to avoid large changes in the relative positions of the first lens 3 and the housing 1 when the variable focus lens assembly is placed in different postures due to the influence of gravity on the first lens 3 and the electro-deformation element 41, so that the anti-shake performance of the variable focus lens assembly is improved. The specific pre-tension value can be set according to the weight of the first lens 3 and the electro-deformable element 41 and the required degree of anti-shake performance.
The electro-deformable element 41 may be made of any electro-deformable material that can provide a sufficient amount of deformation. The electrostrictive material is a material which can change shape under a certain voltage, and mainly comprises electrostrictive material and piezoelectric material. For example, the electrostrictive element 41 of the present embodiment may be made of a piezoelectric material, but the material of the electrostrictive element 41 is not limited to the piezoelectric material. The following description will be given taking an example in which the electrostrictive element 41 is made of a piezoelectric material.
The piezoelectric material is a material with piezoelectric effect, and the principle of the piezoelectric effect is as follows: if pressure is applied to the piezoelectric material in a certain direction, polarization phenomenon can be generated inside the piezoelectric material, and potential difference is generated between two opposite surfaces of the piezoelectric material, and the phenomenon is called positive piezoelectric effect; on the contrary, if an electric field is applied in the polarization direction of the piezoelectric material, the piezoelectric material will generate a corresponding mechanical deformation, and after the electric field is removed, the deformation of the piezoelectric material will disappear, which is called inverse piezoelectric effect. According to the inverse piezoelectric effect, when a certain voltage is applied to the electrostrictive element 41 made of a piezoelectric material, the electrostrictive element 41 deforms accordingly, and the deformation amount of the electrostrictive element 41 is positively correlated with the applied voltage.
The electrostrictive element 41 is fixed to the surface of the elastic sheet 2, and may be fixed by, for example, adhesion, welding, or the like. Preferably, the electrical deformation element 41 should be made of a material with high brittleness, so as to prevent the electrical deformation element 41 from being broken when being impacted by an external force or bent along with the deformation of the elastic sheet 2, and thus, the normal operation of the variable focus lens assembly is not affected.
The electro-deformable element 41 surrounds the periphery of the first lens 3 and extends along a spiral line, the centre of which is aligned with the optical axis of the first lens 3. The surface of the elastic sheet 2 can be regarded as a plane in a natural state when no external force is applied, and the spiral line is a plane spiral line on the surface of the elastic sheet 2. The type of the spiral may be an archimedean spiral, an equiangular spiral, a hyperbolic spiral, etc. Preferably, the helix is an archimedean helix. An archimedean spiral, also known as a constant velocity spiral, is a trajectory produced by a point rotating around a fixed point at a constant velocity while leaving the fixed point. The maximum size of the structure of the electro-deformation element 41 can be reduced by adopting the Archimedes spiral, and the overall size of the lens assembly is favorably reduced.
The direction of deformation of the electro-deformable element 41 has a component directed towards the first mirror 3, and when the electro-deformable element 41 is deformed by applying a voltage, the side surface of the elastic sheet 2 connected to the electro-deformable element 41 is correspondingly stretched or compressed. During the travel of a moving point from the outer end to the inner end of the helix, the distance of the moving point from the center of the mounting hole gradually decreases, so that when the electrostrictive element 41 elongates or shortens along the extension direction of the helix, the elongation or shortening deformation has a component directed toward the center of the mounting hole or directed outward from the center of the mounting hole. Thus, when the electrostrictive element 41 is deformed by application of a voltage, the deformable portion can generate a tensile force in the radial direction. Since the first lens 3 can be regarded as a rigid body and the outer edge of the elastic sheet 2 is fixedly connected with the flange 11 of the housing 1, the perforated part can protrude outward or indent relative to the edge part of the elastic sheet 2, so that the first lens 3 can be displaced along the optical axis direction, thereby realizing zooming.
Fig. 4 and 5 are schematic views of the operating state of the variable focus lens assembly shown in fig. 3. Specifically, as shown in fig. 3, taking the example that the electrical deformation element 41 is fixed on the upper surface of the elastic sheet 2, when the electrical deformation element 41 is not applied with a voltage, the deformable portion of the elastic sheet 2 is in a flat state, and the first lens 3 is in a neutral position; as shown in fig. 4, when a direct current in a predetermined direction is applied to the electro-deformation element 41, the electro-deformation element 41 is extended, so that the upper surface of the elastic piece 2 connected thereto is extended, and the middle portion of the elastic piece 2 is recessed downward with respect to the outer circumference due to the fixed connection of the outer edge of the elastic piece 2 with the flange 11 of the housing 1; as shown in fig. 5, when a direct current in the opposite direction is applied to the electro-deformation element 41, the electro-deformation element 41 is shortened, so that the upper surface of the elastic piece 2 connected thereto is contracted, and the middle portion of the elastic piece 2 is protruded upward with respect to the outer circumference since the outer edge of the elastic piece 2 is fixedly connected to the flange 11 of the housing 1.
Fig. 6 is a top view of another variable focus lens assembly of an embodiment of the present invention. The electro-deformable element may be a continuous whole (refer to fig. 1 and 2), or the electro-deformable element may include a plurality of deformation units arranged along a spiral line. The deformation units arranged along the spiral line can be regarded as dividing a complete electrostrictive element 41 at a predetermined position or positions to form a plurality of deformation units with a certain structural independence therebetween. The end parts of two adjacent deformation units can have a certain gap. For example, the electrical deformation element in fig. 6 includes two deformation units 41a and 41b, and a certain gap is formed between the inner end of the deformation unit 41a and the outer end of the deformation unit 41 b. The deformation units can be connected in parallel or in series, or the deformation units can be applied with voltage independently. Different deformation units can have different piezoelectricity characteristics, can make the deformation of the different parts production equidimension of flexure strip 2 from this, perhaps make as required that a part of flexure strip 2 takes place deformation and another part does not take place deformation, be favorable to placing the gesture, service environment's difference according to the lens subassembly of zooming and adjust each part deformation of flexure strip 2, make the imaging effect more stable.
In an alternative embodiment, the variable focus lens assembly further comprises a light sensing element 5. The light sensing element 5 is a functional device that converts the light image on the light sensing surface into an electrical signal in a proportional relationship with the light image by using the photoelectric conversion function of the photoelectric device. The photosensitive element 5 is fixed on one side of the first lens 3 and has a predetermined distance with the first lens 3, the photosensitive element 5 is aligned with the first lens 3, and the photosensitive element 5 enables the first lens 3 to guide light to the photosensitive element 5. In this embodiment, the photosensitive element 5 may be a Charge Coupled Device (CCD), a Complementary Metal-Oxide Semiconductor (CMOS) or other types of suitable photosensitive elements 5, which is not limited in the present invention.
The photosensitive element 5 may be disposed inside the housing 1, or may be disposed outside the housing 1. When the photosensitive element 5 is disposed outside the bottom of the housing 1, the bottom of the housing 1 has a corresponding light-transmitting structure so that the light converged by the first lens 3 can reach the photosensitive element 5. The light transmissive structure may be a perforation, a transparent material, or the like.
The variable focus lens assembly further comprises a positioning structure (not shown) for positioning the light sensing element 5. For example, the photosensitive element 5 is disposed in the protective casing, a buckle is disposed on the protective casing, a corresponding clamping groove is disposed on the casing 1, and the photosensitive element 5 is positioned by connecting the buckle and the clamping groove. Of course, the skilled person can also realize the positioning of the photosensitive element 5 by providing other forms of positioning structures.
The variable focus lens assembly further comprises a control circuit. The control circuit is electrically connected to the electrostrictive element 41, and applies a predetermined voltage to the electrostrictive element 41. The control circuit may also be connected to the light sensing element 5 and receive and process the output signal of the light sensing element 5. The control circuit applies a corresponding voltage to the electro-deformable element 41 according to the output signal of the light sensing element 5. For example, the control circuit detects the degree of focusing from the output signal of the light sensing element 5, and controls the position of the first lens 3 by activating the electro-deformable element 41 to automatically perform focusing. The control circuit may use any known focusing method for auto-focusing, which is not limited by the present invention.
The housing 1 may further have a fixing hole 12, and the variable focus lens assembly further includes a second lens 6, and the second lens 6 is fixed in the fixing hole 12 by bonding, welding, snap-fit connection or other means, i.e. the distance between the second lens 6 and the photosensitive element 5 is constant. The second lens 6 may be a lens, a cylinder, a filter, etc., but the invention is not limited thereto. The securing holes 12 are aligned with the mounting holes so that the first lens 3 and the second lens 6 are aligned. The light is guided to the light-sensitive element 5 via the first lens 3 and the second lens 6.
Fig. 7 is a cross-sectional view of yet another variable focus lens assembly of an embodiment of the present invention. As shown in fig. 7, a plurality of first lenses 3, a plurality of elastic sheets 2 and a corresponding plurality of electrostrictive elements 41 may be provided as required by those skilled in the art, for example, the variable focus lens assembly of fig. 7 includes two first lenses 3. The plurality of elastic pieces 2 are disposed at a predetermined distance, and the plurality of elastic pieces 2 are substantially parallel. The positions of the plurality of first lenses 3 are aligned, specifically, the optical axes of the plurality of first lenses 3 are aligned. The electro-deformable elements 41 corresponding to different first lenses 3 may be connected in series, in parallel or separately to the control circuit. Therefore, the zoom lens assembly is provided with the composite lens system, and the magnification of the lens system formed by the two first lenses 3 can be changed by adjusting the positions of the two first lenses 3, so that the zoom magnification range of the zoom lens assembly is improved.
The variable-focus lens assembly comprises a shell, an elastic sheet, a first lens and at least one electrostrictive element, wherein the shell is provided with a flange, the middle part of the elastic sheet is provided with a mounting hole, the first lens is fixed in the mounting hole, the periphery of the mounting hole is provided with a deformable part, and the edge of the deformable part is fixed at the flange; the electric deformation element is fixed on the deformable part and extends along a spiral line around the first lens, and voltage is applied to the electric deformation element to enable the inner side end and the outer side end of the electric deformation element to generate relative displacement, so that the elastic sheet deforms and drives the first lens to move axially to achieve zooming. Therefore, the variable-focus lens assembly provided by the embodiment of the invention has the advantages of simple structure, small occupied space, strong driving force and capability of realizing accurate focusing.
Example two:
fig. 8 is a top view of a variable focus lens assembly of an embodiment of the present invention. As shown in fig. 8, the variable focus lens assembly of the present embodiment includes two electro-deformable elements, namely, an electro-deformable element 42 and an electro-deformable element 43, and the two electro- deformable elements 42 and 43 are respectively fixed to both sides of the elastic sheet 2. The two electrostrictive elements 42 and 43 may be identical or different. In operation, both of the electrostrictive elements may be energized simultaneously or to one of the electrostrictive elements. When a larger adjustment of the first lens 3 is required, a voltage can be applied to the two electrostrictive elements 42 and 43 simultaneously, so that the electrostrictive element on one side of the elastic sheet 2 is extended and the electrostrictive element on the other side is contracted, i.e. one side surface of the elastic sheet 2 is stretched and the other side surface is compressed, and thus the middle portion of the elastic sheet 2 is bent in the direction of the compressed one side surface, and the first lens 3 is driven to move. The zoom range can be effectively improved by arranging two electrostrictive elements.
The structures and the connection relationship among the housing 1, the elastic sheet 2, the first lens 3 and other components of the variable focus lens assembly in the embodiment of the invention are basically the same as those in the first embodiment, and are not described again here.
Example three:
fig. 9 is a top view of a variable focus lens assembly of an embodiment of the present invention. As shown in fig. 9, the variable focus lens assembly of the present embodiment includes two electro-deformable elements, namely, an electro-deformable element 44 and an electro-deformable element 45, and the electro- deformable elements 44 and 45 are disposed on the same side surface of the elastic sheet 2 in a centrosymmetric manner, and the two electro-deformable elements do not intersect with each other. Thus, the two electrostrictive elements form a planar double spiral structure. Preferably, the electrostrictive elements 44 and 45 each extend along an archimedean spiral, enabling a reduction in the dimensions of the structure of the electrostrictive elements at their maximum.
In operation, when the same direction of current is applied to the electro- deformable elements 44 and 45, the deformation effect of the elastic sheet 2 is a positive superposition of the deformation of the elastic sheet 2 driven by the two electro-deformable elements alone. The arrangement of two centrosymmetric electrostrictive elements can increase the driving force of the electrostrictive element as a whole without basically increasing the volume of the variable-focus lens assembly, thereby increasing the focal length adjustment range of the variable-focus lens assembly.
The structures and the connection relationship among the housing 1, the elastic sheet 2, the first lens 3 and other components of the variable focus lens assembly in the embodiment of the invention are basically the same as those in the first embodiment, and are not described again here.
Example four:
the variable focus lens assembly of the present embodiment includes four electro-deformable elements, and specifically, the variable focus lens assembly includes two sets of electro-deformable elements as described in embodiment three, where each set of electro-deformable elements includes an electro-deformable element 44 and an electro-deformable element 45 as described in embodiment three. The two groups of the electro-deformation elements are respectively arranged at two sides of the elastic sheet 2. When zooming is required, the control circuit applies a predetermined voltage to one or more deformation elements therein, so that the elastic piece 2 deforms in a predetermined direction, thereby adjusting the position of the first lens 3. The four electro-deformation elements can further increase the driving force and expand the zooming range of the variable-focus lens assembly.
The structures and the connection relationship among the housing 1, the elastic sheet 2, the first lens 3 and other components of the variable focus lens assembly in the embodiment of the invention are basically the same as those in the first embodiment, and are not described again here.
Example five:
the variable focus lens assembly of the first to fourth embodiments may be applied to an electronic device, which may be any type of electronic device that needs to be provided with a lens assembly to implement a photographing and/or video recording function, such as a mobile phone, a tablet computer, a notebook computer, a game machine, a smart watch, a car recorder, and the like. In the following, the electronic device is taken as a mobile phone as an example, but the specific form of the electronic device is not limited to the mobile phone.
Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 10, the electronic device of the embodiment of the present invention includes a housing B and a variable focus lens assembly a. The variable focus lens assembly a is fixedly connected to the casing B, and the variable focus lens assembly a may be usually accommodated in the casing B. Of course, the variable focus lens assembly a may be partially exposed from the housing B, for example, the first lens 3 may be exposed from the housing B. The housing B has a transparent cover (e.g., glass) corresponding to the first lens 3 so that external light can be incident into the first lens 3 through the transparent cover, and the photosensitive element 5 converts the light condensed by the first lens 3 into an electrical signal for imaging. By arranging the variable-focus lens assembly in at least some embodiments of the invention, ultra-thinning and light-weight design of electronic equipment is facilitated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A variable focus lens assembly, comprising:
a housing having a flange;
the elastic sheet is provided with a mounting hole in the middle, a deformable part is arranged on the periphery of the mounting hole, and the edge of the deformable part is fixedly connected with the flange;
the first lens is fixed in the mounting hole; and
at least one electrostrictive element fixed to the deformable portion, the electrostrictive element extending around the first lens along a spiral line, the electrostrictive element being configured to be deformed by voltage excitation, causing relative displacement between an inner end and an outer end of the electrostrictive element.
2. The variable focus lens assembly of claim 1 wherein points on the spiral line increase in distance from the inner end to the outer end and the center of the mounting hole.
3. The variable focus lens assembly of claim 1, wherein the elastomeric sheet is configured to lie flat when the electro-deformable element is not subjected to an applied voltage.
4. The variable focus lens assembly of claim 1, wherein a center of the spiral line is aligned with an optical axis of the first lens.
5. The variable focus lens assembly of claim 1, further comprising a light sensing element secured to a side of the first lens, the first lens being configured to direct light to the light sensing element.
6. The variable focus lens assembly of claim 5, further comprising:
a control circuit configured to apply a voltage to the electro-deformation element according to an output signal of the light sensing element.
7. The variable focus lens assembly of claim 5, further comprising:
a positioning structure configured to position the photosensitive element.
8. The variable focus lens assembly of claim 1 wherein the electro-deformable element is a continuous unitary body or comprises a plurality of deformable elements arranged along the spiral.
9. The variable focus lens assembly of claim 1, wherein the variable focus lens assembly comprises two of said electro-deformable elements, each of said electro-deformable elements being secured to either side of said flexible sheet.
10. The variable focus lens assembly of claim 1, wherein the variable focus lens assembly comprises two electro-deformable elements that are centrosymmetric and do not intersect each other.
11. The variable focus lens assembly of claim 1, wherein the housing further has a fixing hole aligned with the first lens, the variable focus lens assembly further comprising a second lens fixed to the fixing hole.
12. The variable focus lens assembly of claim 1, wherein the flexible sheet is made of a polymeric or metallic material.
13. An electronic device comprising at least one variable focus lens assembly as claimed in any of claims 1 to 12.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010827064.4A CN111856694A (en) | 2020-08-17 | 2020-08-17 | Zoom lens assembly and electronic equipment applying same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010827064.4A CN111856694A (en) | 2020-08-17 | 2020-08-17 | Zoom lens assembly and electronic equipment applying same |
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| CN111856694A true CN111856694A (en) | 2020-10-30 |
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| CN114666468A (en) * | 2020-12-23 | 2022-06-24 | 维沃移动通信有限公司 | Camera shooting assembly and electronic equipment |
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