CN115469387B - Zoom lens, lens assembly and camera module - Google Patents

Zoom lens, lens assembly and camera module Download PDF

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Publication number
CN115469387B
CN115469387B CN202110654099.7A CN202110654099A CN115469387B CN 115469387 B CN115469387 B CN 115469387B CN 202110654099 A CN202110654099 A CN 202110654099A CN 115469387 B CN115469387 B CN 115469387B
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China
Prior art keywords
electrode
liquid
support base
base
lens
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CN202110654099.7A
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CN115469387A (en
Inventor
姚立锋
周秀秀
黄桢
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Ningbo Sunny Opotech Co Ltd
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Ningbo Sunny Opotech Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/12—Fluid-filled or evacuated lenses
    • G02B3/14—Fluid-filled or evacuated lenses of variable focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
    • 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
    • G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
    • G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
    • 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
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

The invention provides a zoom lens, a lens assembly and an image pickup module, wherein the zoom lens comprises a base, a first liquid, a second liquid and at least one electrode group, the base is provided with a closed accommodating space, the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, the first liquid and the second liquid are not miscible, an optical interface is formed between the first liquid and the second liquid, the at least one electrode group is arranged in the base, the electrode group comprises a first electrode and a second electrode, the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, and the first electrode is wrapped by the base and is insulated from the second liquid.

Description

Zoom lens, lens assembly and camera module
Technical Field
The present invention relates to an optical lens, and more particularly to a zoom lens, a lens assembly and an image capturing module.
Background
Camera modules have become an indispensable part of electronic terminal equipment, and with the continuous development of technology, high pixels, large chips, small size, and large aperture are the development trend of existing camera modules.
The camera module comprises a zooming camera module and a fixed focus camera module, wherein the zooming camera module refers to a camera module with adjustable focal length, and the fixed focus camera module refers to a camera module with non-adjustable focal length. The size of the electronic device is limited, and the rear camera module is usually a zoom camera module, which adjusts the focal length of the zoom camera module by changing the relative position of the optical lens with respect to the photosensitive chip, so that a larger travel space must be reserved for the optical lens to move along the optical axis direction to realize the zooming of the zoom camera module, which results in that the overall height size of the camera module cannot be substantially reduced, and further the development trend of the zoom camera module is not in line with the development direction of the thinning of the electronic device; the front-mounted camera module is usually a fixed-focus camera module, and the relative position of the optical lens relative to the photosensitive chip is kept unchanged, so that the whole height of the fixed-focus camera module can be reduced without reserving a travel space, but the imaging capability of the fixed-focus camera module is greatly limited to further limit the application scene of the electronic device.
In addition, the periscope type camera module has the optical zooming capability and is widely applied to the array camera module. However, the periscope type camera module in the prior art has the problems of large volume, complex structure and the like, and the periscope type camera module mainly realizes long-range shooting in a light path turning mode, so that the periscope type camera module often needs to be provided with an optical lens with a larger focal length. The optical path constructed based on the large focal length optical lens needs to have a sufficient length under the limitation of optical theory. The prior art long Jiao Qian telephoto modules may have an effective focal length of greater than or equal to 15mm, or may have a field angle of 25 degrees or less. The longer focal length must have a longer back focal length, which is one of the difficulties in downsizing the periscope type camera module, and this makes it difficult to reduce the space occupied by the electronic terminal, and thus limits the application of the existing periscope type camera module in the electronic terminal. On the other hand, in the practical application process of the periscope type camera shooting module, in order to meet continuous zooming and clear imaging, an actuating system is required to be arranged in the module for driving at least two movable lens groups, one group is used for realizing zooming, namely changing focal length, and the other group is used for realizing focusing, namely moving a lens along an optical axis, and adjusting the distance between an optical system and a photosensitive assembly, so that imaging is clear. At least two lens groups move in the same direction and move axially, so that the periscope type optical variable module is too long and occupies a larger installation space.
Disclosure of Invention
One of the main advantages of the present invention is to provide a zoom lens, a lens assembly and an image capturing module, wherein the zoom lens changes the focal power of the lens based on the electrowetting effect, which is beneficial to continuous zooming of the image capturing module.
Another advantage of the present invention is to provide a zoom lens, a lens assembly, and an image capturing module, wherein the zoom lens includes a base and at least one electrode disposed in the base, wherein the electrode is integrally formed with the base, and the electrode is fixed and supported by the base, which is beneficial to improving structural stability of the zoom lens.
Another advantage of the present invention is to provide a zoom lens, a lens assembly, and an image capturing module, wherein the electrode includes a first electrode and a second electrode, and the first electrode and the second electrode are integrally formed on the base by in-mold molding, which simplifies the manufacturing process of the zoom lens and provides structural stability.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and an image capturing module, wherein the lens includes at least one zoom lens, and a driving device for driving the zoom lens is not required, so that the structure is simplified and the manufacturing cost is reduced.
Another advantage of the present invention is to provide a zoom lens, a lens assembly, and an image capturing module, in which the lens assembly can avoid shake during movement, which is beneficial to improving the capturing effect.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and an image capturing module, wherein the lens assembly of the image capturing module is improved by a lens structure, thereby improving the focal power change, realizing the zoom capability, eliminating the zoom motor, and greatly reducing the manufacturing cost and difficulty of the module.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and an image capturing module, wherein the present invention successfully provides a compact, optically variable length continuous zoom imaging module with simple structure and low cost.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and an image capturing module, wherein the present invention provides a continuous zoom imaging module with a fast zoom response speed, a large zoom range and high imaging quality.
In accordance with one aspect of the present invention, a zoom lens of the present invention capable of achieving the foregoing and other objects and advantages includes:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein at least one electrode group is built-in the base, the electrode group includes a first electrode and a second electrode, wherein the second electrode extends to the accommodation space inboard from the base, the second electrode with the second liquid phase contact, the first electrode is wrapped up by the base and with the second liquid insulation.
According to one embodiment of the present invention, the base includes a support base, a first substrate and a second substrate disposed on the support base, wherein the first substrate is disposed on a light incident side of the support base, and the second substrate is disposed on a light emergent side of the support base, and the support base, the first substrate and the second substrate together form the accommodating space.
According to one embodiment of the invention, the support base is integrally formed by injection molding, and the first electrode and the second electrode of the electrode group are embedded in the support base, whereby the support base fixes and supports the first electrode and the second electrode.
According to one embodiment of the invention, the first electrode comprises a first inlay, a second inlay and a first electrode contact, wherein the first electrode contact of the first electrode protrudes outwards from the support base.
According to one embodiment of the present invention, the support base has an inner sidewall, the first inlay of the first electrode is parallel to the inner sidewall, and a dielectric layer is formed between the first inlay of the first electrode and the inner sidewall by the support base, wherein the dielectric layer is an insulating material, whereby the dielectric layer electrically insulates the second liquid from the first electrode.
According to one embodiment of the present invention, the second electrode includes a second electrode body, and an inner contact point and an outer contact point integrally extending from the second electrode body, wherein the second electrode body of the second electrode is disposed in the support base, the inner contact point of the second electrode body extends from the second electrode body to the accommodating space inward, and the outer contact point of the second electrode extends from the second electrode body outward.
According to one embodiment of the invention, the first liquid is held at the light entrance side of the support substrate, the second liquid is held at the light exit side of the support substrate, and refractive indices of the first liquid and the second liquid are different.
According to one embodiment of the invention, the refractive index of the first liquid is greater than the refractive index of the second liquid.
According to another aspect of the present invention, there is further provided a lens assembly, comprising:
A zoom lens;
At least one lens unit; and
A driver in which the at least one lens unit and the zoom lens are disposed in the same optical axis direction, the zoom lens comprising:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein the at least one electrode group is built in the base, the electrode group comprises a first electrode and a second electrode, wherein the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, the first electrode is wrapped by the base and is insulated from the second liquid, the driver is electrically connected with the electrode group, and external voltage is applied to the first electrode and the second electrode of the electrode group through the driver so as to adjust the curvature of the optical interface between the first liquid and the second liquid.
According to another aspect of the present invention, there is further provided an image capturing module, including:
A lens assembly;
A photosensitive component, wherein the lens component is arranged along a photosensitive path of the photosensitive component; and
The driving device is in transmission connection with the photosensitive assembly, the photosensitive assembly is driven to move by the driving device, and the lens assembly comprises:
A zoom lens;
At least one lens unit; and
A driver in which the at least one lens unit and the zoom lens are disposed in the same optical axis direction, the zoom lens comprising:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein the at least one electrode group is built in the base, the electrode group comprises a first electrode and a second electrode, wherein the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, the first electrode is wrapped by the base and is insulated from the second liquid, the driver is electrically connected with the electrode group, and external voltage is applied to the first electrode and the second electrode of the electrode group through the driver so as to adjust the curvature of the optical interface between the first liquid and the second liquid.
According to an embodiment of the invention, the camera module further includes a light turning element, wherein the light turning element is disposed at a front end of the lens assembly in a light incident direction, and the direction of the light path is adjusted by the light turning element.
According to an embodiment of the present invention, the lens assembly includes a variable magnification lens assembly and a compensation lens assembly, wherein the variable magnification lens assembly and the compensation lens assembly are coaxially disposed along the same optical axis, wherein the variable magnification lens assembly is used for actively adjusting a focal length, and the compensation lens assembly is used for compensating for a focal change of an optical system caused by the variable magnification lens assembly.
Further objects and advantages of the present invention will become fully apparent from the following description and the accompanying drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description and accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a zoom lens according to a first preferred embodiment of the present invention.
Fig. 2A and 2B are schematic diagrams illustrating the operation of the zoom lens according to the first preferred embodiment of the present invention.
Fig. 3A to 3D are schematic views of a manufacturing method of the zoom lens according to the first preferred embodiment of the present invention.
Fig. 4 is a schematic overall structure of a lens assembly according to a first preferred embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an image capturing module according to a first preferred embodiment of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
A zoom lens according to a first preferred embodiment of the present invention is explained in the following description with reference to fig. 1 to 2B of the drawings of the present specification. The zoom lens includes a base 10, a first liquid 20 and a second liquid 30 held in the base 10, and at least one electrode group 40 built in the base 10, wherein the base 10 has a closed accommodating space 100, and the first liquid 20 and the second liquid 30 are held in the accommodating space 100 of the base 10. The first liquid 20 and the second liquid 30 have different refractive indices and are immiscible. In the preferred embodiment of the present invention, the first liquid 20 is an insulating liquid and the second liquid 30 is a conductive liquid. The first liquid 20 may be, but not limited to, an oil-containing or oily substance, the second liquid 30 may be, but not limited to, an aqueous solution, and the first liquid 20 and the second liquid 30 are in contact with each other in the accommodating space 100 of the base 10, and an optical interface 101 is defined by the first liquid 20 and the second liquid 30 together.
It should be noted that the densities of the first liquid 20 and the second liquid 30 are substantially the same, i.e. the relative positions of the first liquid 20 and the second liquid 30 are not affected by gravity.
The base 10 includes a support base 11, a first substrate 12 and a second substrate 13 disposed on the support base 11, wherein the first substrate 12 is disposed on the light incident side of the support base 11, the second substrate 13 is disposed on the light emergent side of the support base 11, that is, the light enters the accommodating space 100 of the base 10 through the first substrate 12, and the light exits from the accommodating space 100 to the light emergent side through the second substrate 13. The support base 11, the first substrate 12, and the second substrate 13 of the base 10 together form the accommodating space 100 of the base 10, and hold the first liquid 20 and the second liquid 30 in the accommodating space 100 of the base 10.
Preferably, the first liquid 20 is held on the light incident side of the base 10, the second liquid 30 is held on the light emergent side of the base 10, and the light enters the first liquid 20 through the first substrate 12, is refracted by the first liquid 20, is refracted by the optical interface 101, reaches the second liquid 30, is refracted by the second liquid 30, and is emitted outwards through the second substrate 13.
Preferably, in this preferred embodiment of the present invention, the first substrate 12 and the second substrate 13 are optically transparent materials. By way of example, in this preferred embodiment of the invention, the first substrate 12 and the second substrate 13 may be, but are not limited to, glass.
The at least one electrode group 40 is built in the support base 11 of the base 10, and the at least one electrode group 40 is fixed and supported by the support base 11. The electrode set 40 includes a first electrode 41 and a second electrode 42, wherein the first electrode 41 is insulated from the first liquid 20 and the second liquid 30 in the accommodating space 100 by the support base 11, the second electrode 42 extends from the support base 11 to the accommodating space 100 of the base 10, and the second electrode 42 is electrically conductive to the second liquid 30.
Preferably, in the preferred embodiment of the present invention, the support base 11 of the base 10 is an insulating material, and the support base 11 is integrally formed by a molding process. The first electrode 41 and the second electrode 42 of the electrode set 40 are embedded in the support base 11, so that the electrode assembly 40 and the support base 11 are in a unitary structure.
The first liquid 20 and the second liquid 30 are held in the receiving space 100 of the base 10, and the second liquid 30 is in contact with the second electrode 42 of the electrode assembly 40, the first liquid 20 is located at the light incident side of the base 10, and the first liquid 20 is spaced from the electrode assembly 40 by the second liquid 30, and the first liquid 20 is not in contact with the first electrode 41 and the second electrode 42 of the electrode assembly 40.
Preferably, in this preferred embodiment of the present invention, the optical interface 101 formed between the first liquid 20 and the second liquid 30 is meniscus-shaped when the second liquid 30 is not energized. It will be appreciated that the shape of the optical interface 101 is merely exemplary and not limiting herein, and that the surface shape of the optical interface 101 may vary depending on the choice of materials for the first liquid 20 and the second liquid 30. Since the refractive indices of the materials of the first liquid 20 and the second liquid 30 are different, the first liquid 20 and the second liquid 30 may perform an optical path transition for light passing through the optical interface 101, and thus, a curvature of the optical interface 101 between the first liquid 20 and the second liquid 30 is changed by applying a voltage between the first electrode 41 and the second electrode 42 of the electrode assembly 40, thereby changing a direction of an optical path.
It should be noted that the edge of the optical interface 101 formed by the first liquid 20 and the second liquid 30 is located on the inner side wall of the base 10, that is, the edge of the optical interface 101 intersects the inner side wall of the base 10. Therefore, when the surface shape of the optical interface 101 is changed, the position at which the optical interface 101 intersects with the inner wall of the base 10 is also changed accordingly to accommodate the surface shape of the optical interface 101.
Preferably, in the preferred embodiment of the present invention, the refractive index of the first liquid 20 and the second liquid 30 are different, and the refractive index of the first liquid 20 is greater than the refractive index of the second liquid 30.
The first and second electrodes 41 and 42 of the electrode assembly 40 are conductive metals, and the first and second electrodes 41 and 42 are embedded in the support base 11 by insert molding, and the electrode assembly 40 is supported and fixed by the support base 11. It will be appreciated that the first electrode 41 and the second electrode 42 of the electrode assembly 40 are fixed by the support base 11 in an in-mold injection manner, so that the stability of the relative position of the electrode assembly 40 can be improved, the electrode assembly 40 is prevented from being biased by vibration, and the stability of the product operation can be improved.
The support base 11 has an inner sidewall 110, an light inlet 120 formed on the light inlet side of the support base 11, and a light outlet 130 formed on the light outlet side of the support base 11, wherein the substrate 12 is disposed on the light inlet 120 of the support base 11, and the second substrate 13 is disposed on the light outlet 130 of the support base 11.
Preferably, the inner side surface formed by the inner side wall 110 of the support base 11 is an inclined surface, wherein the inner side wall 110 of the support base 11 extends obliquely outward from the light outlet 130 to the light incident side of the support base 11, whereby the support base 11 converges external light into the accommodating space 100 of the support base 11.
The first electrode 41 includes a first inlay 411, a second inlay 412 and a first electrode contact 413, wherein the first electrode contact 413 of the first electrode 41 protrudes outward from the support base 11, and the first inlay 411 and the second inlay 412 are electrically conducted through the first electrode contact 413 of the first electrode 41.
Preferably, the first inlay 411 and the second inlay 412 of the first electrode 41 are covered or wrapped by the support base 11, whereby the support base 11 fixes the first inlay 411 and the second inlay 412 of the first electrode 41.
The support base 11 is wrapped around the first inlay 411 of the first electrode 41, and the first liquid 20 and the second liquid 30 inside the first electrode 41 are separated by the support base 11, so as to avoid the first electrode 41 from contacting the second liquid 30.
Preferably, the first inlay 411 of the first electrode 41 is parallel to the inner sidewall 110 of the support base 11, and a dielectric layer 111 is formed between the first inlay 411 of the first electrode 41 and the inner sidewall 110 by the support base 11, wherein the dielectric layer 111 is an insulating material, thereby electrically insulating the second liquid 30 from the first electrode 41.
It should be noted that the first electrode 41 is embedded in the support base 11 and the support base 11 provides an insulating layer for isolation, so that no insulating material is needed between the first electrode 41 and the second liquid 30, which is beneficial to simplifying the structure of the lens. The second inlay 412 of the first electrode 41 connects the first inlay 411 to the first electrode contact 413. Preferably, the second inlay 412 of the first electrode 41 is parallel to the second electrode 42.
The second electrode 42 includes a second electrode body 421 and an inner contact 422 and an outer contact 423 integrally extending from the second electrode body 421, wherein the second electrode body 421 of the second electrode 42 is disposed in the support base 11, the inner contact 422 of the second electrode body 42 extends from the second electrode body 421 to the accommodating space 100 inward, and the inner contact 422 of the second electrode body 42 contacts the second liquid 30. The external contact 423 of the second electrode 42 extends outward from the second electrode body 421, and the second liquid 30 is electrically conducted through the external contact 423.
Preferably, in this preferred embodiment of the present invention, the second electrode 42 is provided at the light-emitting side of the support base 11, wherein the second electrode 42 is in contact with the second liquid 30 at a position close to the light-emitting side of the support base 11.
In detail, the support base 11 is further provided with a substrate mounting groove 112, wherein the substrate mounting groove 112 is formed at an inner side of the support base 11 with an opening facing the light emitting side of the support base 11, and the second substrate 13 is fixed to the substrate mounting groove 112 of the support base 11. Preferably, the second electrode 42 is embedded in the substrate mounting groove 112 of the support base 11, and the second substrate 13 is hermetically disposed on the light emitting side of the second electrode 42, the second electrode 42 being further fixed and supported by the second substrate 13 to keep the second electrode 42 in contact with the second liquid 30.
As described in fig. 2A and 2B, using the electrowetting effect, it is possible to adjust the change in the area curvature of the optical interface 101 between the first liquid 20 and the second liquid 30 according to the voltage V applied between the first electrode 41 and the second electrode 42 of the electrode group 40, so that the optical power of the lens is changed. When the first electrode 41 and the second electrode 42 of the electrode group 40 are not applied with a voltage or a voltage value between the first electrode 41 and the second electrode 42 is small, the optical interface 101 between the first liquid 20 and the second liquid 30 is an interface protruding toward the light entrance side, and light is diffused outward through the optical interface 101. In short, the liquid-liquid interface is convex when in an unpowered state, thereby allowing light rays passing through the interface to diffuse.
When the first electrode 41 and the second electrode 42 of the electrode group 40 are energized, the optical interface 101 between the first liquid 20 and the second liquid 30 is projected toward the light-emitting side, through which light is condensed inward, by being changed by the electrowetting effect. That is, when a voltage is applied by energization, the bending direction changes from one curved surface to another, which changes result from the change in the wetting characteristics of the surface by the applied voltage, and the response also causes a change in the fluid position. The interface is concave so that light passing through the interface is focused. The change in surface between the first liquid 20 and the second liquid 30 is merely exemplary and not limiting.
It will be appreciated that the curvature of the interface change can change the focal length and that the meniscus between the two fluids can be used as a variable focus lens to effect a change in optical power.
The basic principle of electrowetting of a variable focus lens as described above:
the interfacial force balance relationship among the liquid 1, the liquid 2 and the dielectric layer is as follows by the Lippmann-Young equation:
where γ 12 is the surface tension between liquid 1 and liquid 2, θ 0 is the initial contact angle at which no voltage is applied, θ 01 is the contact angle at which voltage is applied, d is the thickness of the dielectric layer, ε=ε 0εr is the dielectric constant, and U is the external voltage applied across the two electrodes. When the external force applied to the liquid reaches equilibrium, the following formula is satisfied:
F+γD2＝γ12cosθ1+γ1D
where F represents the power per meter, γ D2 is the surface tension between the dielectric layer and liquid 2, and γ 1D is the surface tension between liquid 1 and the dielectric layer.
Referring to fig. 3A to 3D of drawings of the present specification, there is shown a method of manufacturing the zoom lens according to a preferred embodiment of the present invention, wherein the method of manufacturing the zoom lens comprises the steps of:
(a) Placing an electrode set 40 in a mold, wherein the electrode set 40 comprises a first electrode 41 and a second electrode 42;
(b) Forming a support base 11 in the mold by injection molding, wherein an inner contact point 422 of the second electrode 42 is located inside the support base 11;
(c) The support base 11 is sealed by a first substrate 12 and a second substrate 13 to form a sealed accommodating space, and a first liquid 20 and a second liquid 30 are sequentially injected into the accommodating space 100 of the support base 11.
In the step (c) of the above manufacturing method, a hole is opened at one side of the support base 11, wherein the hole is communicated with the accommodating space 100 of the support base 11 so as to place the first liquid and the second liquid in the accommodating space 100 through the hole.
Referring to fig. 4 of the drawings, a lens assembly 1000 according to another aspect of the present invention is illustrated in the following description. The lens assembly 1000 includes any one of the zoom lenses 200, at least one lens unit 300, and a driver 400 electrically connected to the zoom lens 200, wherein the lens unit 300 and the zoom lens 200 are disposed along the same optical axis direction. As an example, in the preferred embodiment of the present invention, the lens unit 300 is located in front of or behind the light incident direction of the zoom lens 200, and the focal length of the lens assembly 1000 is adjusted by the zoom lens 200. The driver 400 is electrically connected to the zoom lens 200, and the electrode group 40 of the zoom lens 200 is electrically connected to the driver 400 to apply an external voltage to the first electrode 41 and the second electrode 42 of the electrode group 40 via the driver 400, thereby adjusting the change in optical power of the zoom lens 200.
It should be noted that in the preferred embodiment of the present invention, the lens unit 300 of the lens assembly 1000 may be, but is not limited to, a glass lens or a plastic lens, wherein the specific type of the lens unit 300 is given here by way of example only and not by way of limitation.
It can be appreciated that the lens assembly 1000 according to the preferred embodiment of the present invention does not require any driving device to drive any lens to move during focusing or zooming, so that the structure of the lens is simplified and the overall manufacturing cost is reduced. On the other hand, the lens assembly 1000 does not need to adjust the position of the lens assembly 1000 during focusing or zooming, so that shake due to movement is avoided, thereby being beneficial to improving shooting quality.
Referring to fig. 5 of the drawings, according to another aspect of the present invention, there is further provided an image capturing module, wherein the image capturing module includes at least one lens assembly 1000, a photosensitive assembly 2000 and a driving device 3000, the lens assembly 1000 is disposed along a photosensitive path of the photosensitive assembly 2000, wherein the driving device 3000 is drivingly connected to the photosensitive assembly 2000, and the driving device 3000 drives the photosensitive assembly 2000 to move so as to make imaging clear.
It should be noted that, in the preferred embodiment of the present invention, the camera module is a periscope camera module, and accordingly, the camera module further includes a light turning element 4000, wherein the light turning element 4000 is disposed at a front end of the lens assembly 1000 in a light incident direction, and the direction of the light path is adjusted by the light turning element 4000.
In the preferred embodiment of the present invention, the lens assembly 1000 further comprises a variable magnification lens assembly 1000a and a compensation lens assembly 1000b, wherein the variable magnification lens assembly 1000a and the compensation lens assembly 1000b are coaxially disposed along the same optical axis, wherein the variable magnification lens assembly 1000a is used to actively adjust a focal length, and the compensation lens assembly 1000b is used to compensate for a focal change of an optical system caused by the variable magnification lens assembly 1000 a.
It is understood that the variable power lens assembly 1000a and the compensation lens assembly 1000b have the same structure as the lens assembly 1000 described above, wherein the variable power lens assembly 1000a is disposed at the front end of the compensation lens assembly 1000b in the light incident direction. The variable magnification lens 200a of the variable magnification lens assembly 1000a is used for active zooming of the camera module; the variable focus lens 200b of the compensation group lens assembly 1000b is used for compensating for the focal length change of the optical system caused by the variable focus group lens assembly 1000a of the image pickup module. The photosensitive assembly 2000 is driven by the driving device 3000 to perform focusing movement, and the position distance between the photosensitive assembly 2000 and the lens assembly 1000 is adjusted, so that the imaging of the photosensitive assembly 2000 is clear.
It will be appreciated by those skilled in the art that there is no need to move the positions of the variable power lens assembly 1000a and the compensation lens assembly 1000b during this process, nor is there a need to provide a drive means for driving the movement of the lens groups. Therefore, on the premise of ensuring the zooming function, the whole structure of the camera module can be greatly simplified, and the manufacturing cost is reduced; meanwhile, the shaking of the lens group in the moving process is avoided, and the image quality shooting effect is improved.
In addition, it can be understood that the optical power is increased by the structural improvement of the zoom lens 200, and the zoom capability of the image pickup module is achieved by the zoom lens 200 of the variable magnification group lens assembly 1000a and the compensation group lens assembly 1000b without a zoom motor. Therefore, the module cost and the manufacturing difficulty can be greatly reduced under the condition that only the AF motor is reserved.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims (13)

1. A zoom lens, comprising:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein the at least one electrode group is arranged in the base, the electrode group comprises a first electrode and a second electrode, wherein the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, and the first electrode is wrapped by the base and is insulated from the second liquid;
The base comprises a support base, the support base is integrally formed by injection molding, the first electrode and the second electrode of the electrode group are integrally formed on the base by an in-mold injection molding mode, and the first electrode and the second electrode are embedded in the support base, so that the electrode group and the support base are of an integral structure, and the support base is used for fixing and supporting the first electrode and the second electrode; the first electrode comprises a first inlay, a second inlay and a first electrode contact, wherein the first electrode contact of the first electrode protrudes outwards from the support base;
The support base is provided with an inner side wall, the first inlay of the first electrode is parallel to the inner side wall, a dielectric layer is formed between the first inlay of the first electrode and the inner side wall by the support base, and the dielectric layer is made of insulating materials, so that the dielectric layer electrically insulates the first liquid and the second liquid from each other on the first electrode.
2. The zoom lens of claim 1, wherein the base further comprises a first substrate and a second substrate disposed on the support base, wherein the first substrate is disposed on the light incident side of the support base, and the second substrate is disposed on the light exiting side of the support base, and the accommodation space is formed by the support base, the first substrate, and the second substrate together.
3. The zoom lens of claim 2, wherein the second electrode comprises a second electrode body and an inner contact point and an outer contact point extending integrally from the second electrode body, wherein the second electrode body of the second electrode is built in the support base, the inner contact point of the second electrode body extends inward from the second electrode body to the accommodation space, and the outer contact point of the second electrode extends outward from the second electrode body.
4. A zoom lens according to claim 3, wherein the first liquid is held at the light entrance side of the support base, the second liquid is held at the light exit side of the support base, and refractive indices of the first liquid and the second liquid are different.
5. The zoom lens of claim 4, wherein the refractive index of the first liquid is greater than the refractive index of the second liquid.
6. A lens assembly, comprising:
A zoom lens;
At least one lens unit; and
A driver in which the at least one lens unit and the zoom lens are disposed in the same optical axis direction, the zoom lens comprising:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein the at least one electrode group is built in the base, the electrode group comprises a first electrode and a second electrode, wherein the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, the first electrode is wrapped by the base and is insulated from the second liquid, the driver is electrically connected with the electrode group, and external voltage is applied to the first electrode and the second electrode of the electrode group through the driver so as to adjust the curvature of the optical interface between the first liquid and the second liquid;
The base comprises a support base, the support base is integrally formed by injection molding, the first electrode and the second electrode of the electrode group are integrally formed on the base by an in-mold injection molding mode, and the first electrode and the second electrode are embedded in the support base, so that the electrode group and the support base are of an integral structure, and the support base is used for fixing and supporting the first electrode and the second electrode; the first electrode comprises a first inlay, a second inlay and a first electrode contact, wherein the first electrode contact of the first electrode protrudes outwards from the support base;
The support base is provided with an inner side wall, the first inlay of the first electrode is parallel to the inner side wall, a dielectric layer is formed between the first inlay of the first electrode and the inner side wall by the support base, and the dielectric layer is made of insulating materials, so that the dielectric layer electrically insulates the first liquid and the second liquid from each other on the first electrode.
7. The lens assembly of claim 6, wherein the base further comprises a first substrate and a second substrate disposed on the support base, wherein the first substrate is disposed on the light incident side of the support base, and the second substrate is disposed on the light exiting side of the support base, and the accommodation space is formed by the support base, the first substrate and the second substrate together.
8. The lens assembly of claim 7, wherein the second electrode comprises a second electrode body and an inner contact point and an outer contact point extending integrally from the second electrode body, wherein the second electrode body of the second electrode is built in the support base, the inner contact point of the second electrode body extends inward from the second electrode body to the accommodation space, and the outer contact point of the second electrode extends outward from the second electrode body.
9. The lens assembly of claim 8, wherein the first liquid is held at the light entrance side of the support base, the second liquid is held at the light exit side of the support base, and refractive indices of the first liquid and the second liquid are different.
10. The lens assembly of claim 8, wherein the first liquid has a refractive index that is greater than a refractive index of the second liquid.
11. A camera module, its characterized in that includes:
A lens assembly;
A photosensitive component, wherein the lens component is arranged along a photosensitive path of the photosensitive component; and
The driving device is in transmission connection with the photosensitive assembly, the photosensitive assembly is driven to move by the driving device, and the lens assembly comprises:
A zoom lens;
At least one lens unit; and
A driver in which the at least one lens unit and the zoom lens are disposed in the same optical axis direction, the zoom lens comprising:
A base, the base is provided with a closed accommodating space;
A first liquid and a second liquid, wherein the first liquid and the second liquid are kept in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so that the first liquid and the second liquid are not miscible, and an optical interface is formed between the first liquid and the second liquid; and
At least one electrode group, wherein the at least one electrode group is built in the base, the electrode group comprises a first electrode and a second electrode, wherein the second electrode extends from the base to the inner side of the accommodating space, the second electrode is contacted with the second liquid, the first electrode is wrapped by the base and is insulated from the second liquid, the driver is electrically connected with the electrode group, and external voltage is applied to the first electrode and the second electrode of the electrode group through the driver so as to adjust the curvature of the optical interface between the first liquid and the second liquid;
The base comprises a support base, the support base is integrally formed by injection molding, the first electrode and the second electrode of the electrode group are integrally formed on the base by an in-mold injection molding mode, and the first electrode and the second electrode are embedded in the support base, so that the electrode group and the support base are of an integral structure, and the support base is used for fixing and supporting the first electrode and the second electrode; the first electrode comprises a first inlay, a second inlay and a first electrode contact, wherein the first electrode contact of the first electrode protrudes outwards from the support base;
The support base is provided with an inner side wall, the first inlay of the first electrode is parallel to the inner side wall, a dielectric layer is formed between the first inlay of the first electrode and the inner side wall by the support base, and the dielectric layer is made of insulating materials, so that the dielectric layer electrically insulates the first liquid and the second liquid from each other on the first electrode.
12. The camera module according to claim 11, further comprising a light turning element, wherein the light turning element is disposed at a front end of the lens assembly in a light incident direction, and the light path is adjusted by the light turning element.
13. The camera module of claim 11, wherein the lens assembly comprises a variable magnification lens assembly and a compensation lens assembly, wherein the variable magnification lens assembly and the compensation lens assembly are coaxially disposed along a same optical axis, wherein the variable magnification lens assembly is used to actively adjust a focal length, and the compensation lens assembly is used to compensate for focal changes in the optical system caused by the variable magnification lens assembly.
CN202110654099.7A 2021-06-11 2021-06-11 Zoom lens, lens assembly and camera module Active CN115469387B (en)

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CN1942787A (en) * 2004-04-16 2007-04-04 皇家飞利浦电子股份有限公司 Variable focus lens having two liquids and electronic device
CN101910904A (en) * 2008-02-04 2010-12-08 索尼公司 Image picking-up lens system and image picking-up device using the same

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JP4553336B2 (en) * 2000-11-30 2010-09-29 キヤノン株式会社 Optical element, optical apparatus and photographing apparatus
KR100826452B1 (en) * 2006-12-18 2008-04-29 삼성전기주식회사 Optical component and method of manufacturing the same
CN110740234A (en) * 2019-10-14 2020-01-31 Oppo广东移动通信有限公司 Lens group, camera module and electronic equipment
CN111726496A (en) * 2020-06-19 2020-09-29 Oppo广东移动通信有限公司 Imaging device and electronic apparatus

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Publication number Priority date Publication date Assignee Title
CN1942787A (en) * 2004-04-16 2007-04-04 皇家飞利浦电子股份有限公司 Variable focus lens having two liquids and electronic device
CN101910904A (en) * 2008-02-04 2010-12-08 索尼公司 Image picking-up lens system and image picking-up device using the same

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