CN115469387A - Zoom lens, lens assembly and camera module - Google Patents
Zoom lens, lens assembly and camera module Download PDFInfo
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- CN115469387A CN115469387A CN202110654099.7A CN202110654099A CN115469387A CN 115469387 A CN115469387 A CN 115469387A CN 202110654099 A CN202110654099 A CN 202110654099A CN 115469387 A CN115469387 A CN 115469387A
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- 239000007788 liquid Substances 0.000 claims abstract description 212
- 230000003287 optical effect Effects 0.000 claims abstract description 61
- 239000000758 substrate Substances 0.000 claims description 43
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- 230000004308 accommodation Effects 0.000 claims description 5
- 238000001746 injection moulding Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
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- 238000004519 manufacturing process Methods 0.000 description 10
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- 239000012530 fluid Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
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Classifications
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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
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- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- 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 a camera 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 held in the accommodating space of the base, the first liquid is insulating liquid, the second liquid is conductive liquid, so the first liquid and the second liquid are immiscible, and an optical interface is formed between the first liquid and the second liquid, wherein 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 in contact with the second liquid, and the first electrode is wrapped by the base and is insulated from the second liquid.
Description
Technical Field
The present disclosure relates to optical lenses, and particularly to a zoom lens, a lens assembly and a camera module.
Background
The camera module has become an indispensable part of electronic terminal equipment, and with the continuous development of technology, high pixels, large chips, small sizes and large apertures are the development trend of the existing camera module.
According to whether can zoom the type of distinguishing the module of making a video recording, it includes zooming the module of making a video recording and the module of making a video recording of fixed focus, as the name implies, zooming the module of making a video recording and referring to the module of making a video recording that the focus can be adjusted, and the module of making a video recording of fixed focus refers to the module of making a video recording that the focus can not be adjusted. The camera module is limited by the size of the electronic device, and is configured at the rear side of the electronic device, that is, the rear camera module is usually a zoom camera module, and the focal length of the zoom camera module is adjusted by changing the relative position of the optical lens with respect to the photosensitive chip, so that a larger stroke space must be reserved for the optical lens to move along the optical axis direction to realize zooming of the zoom camera module, which causes the overall height size of the camera module to be substantially reduced, and further causes the development trend of the zoom camera module to be not in line with the development direction of thinning the electronic device; the front camera module, which is a camera module disposed at the front side of the electronic device, is generally a fixed-focus camera module, and the relative position of the optical lens with respect to the photosensitive chip is kept unchanged, so that although the optical lens can reduce the overall height size of the fixed-focus camera module without reserving a stroke space, the imaging capability of the fixed-focus camera module is greatly limited, which further limits the application scenarios of the electronic device.
In addition, the periscopic camera module has optical zooming capability, and is widely applied to the array camera module. However, the periscopic camera module in the prior art has the problems of large volume, complex structure and the like, and the periscopic camera module mainly realizes the long-range shooting through the mode of turning the light path, so that the periscopic camera module is often required to be equipped with an optical lens with a larger focal length. Under the limitation of optical theory, the optical path constructed by the optical lens based on the large focal length needs to have a sufficient length. The related art telephoto type camera module may have an effective focal length of 15mm or more, or may have a field angle of 25 degrees or less. The longer focal length must have a longer back focal length, which becomes one of the difficulties in reducing the size of the periscopic camera module, and this makes it difficult to reduce the installation space of the electronic terminal, which becomes a limitation to the application of the existing periscopic camera module in the electronic terminal. On the other hand, in the practical application process of the periscopic camera module, in order to meet continuous zooming and clear imaging, an actuating system is required to be arranged inside the module and used for driving at least two movable lens groups, wherein one group is used for realizing zooming, namely changing focal length, the other group is used for realizing focusing, namely moving a lens along an optical axis, adjusting the distance between an optical system and a photosensitive assembly, and making imaging clear. The moving directions of the at least two lens groups are the same and are axial movement, so that the periscopic optical variable module is too long in length and occupies a large installation space.
Disclosure of Invention
It is a primary advantage of the present invention to provide a zoom lens, a lens assembly and a camera module in which the zoom lens changes the optical power of the lens based on the electrowetting effect, facilitating continuous zooming of the camera module.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and a camera 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 base fixes and supports the electrode, which is beneficial to improving the structural stability of the zoom lens.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and a camera module, wherein the electrodes include a first electrode and a second electrode, and the first electrode and the second electrode are integrally formed on the base by injection molding, so that the manufacturing process of the zoom lens is simplified and the structural stability is improved.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and a camera 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 a camera module, wherein the lens assembly can prevent the lens assembly from shaking during the moving process, which is beneficial to improving the shooting effect.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and a camera module, wherein the lens assembly of the camera module is improved by a lens structure, which improves the variation of focal power, realizes the zoom capability, can eliminate a zoom motor, and greatly reduces the manufacturing cost and difficulty of the module.
Another advantage of the present invention is to provide a zoom lens, a lens assembly and a camera module, wherein the present invention successfully provides a compact, low-light-variation-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 a camera module, wherein the present invention provides a continuous zoom imaging module with a fast zoom response speed, a wide zoom range and a high imaging quality.
In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved by a zoom lens of the present invention, comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set includes 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 in contact with the second liquid, and the first electrode is wrapped by the base and insulated from the second liquid.
According to an embodiment of the present invention, the base includes a supporting base, and a first substrate and a second substrate that are disposed on the supporting base, wherein the first substrate is disposed on a light incident side of the supporting base, the second substrate is disposed on a light emergent side of the supporting base, and the supporting base, the first substrate, and the second substrate together form the accommodating space.
According to an embodiment of the present 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 outward from the support base.
According to an 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 an embodiment of the present invention, the second electrode includes a second electrode main body and an inner contact point and an outer contact point integrally extending from the second electrode main body, wherein the second electrode main body of the second electrode is built in the support base, the inner contact point of the second electrode main body extends from the second electrode main body to the inner side to the accommodation space, and the outer contact point of the second electrode extends from the second electrode main body to the outer side.
According to one embodiment of the present 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 an embodiment of the invention, the refractive index of the first liquid is larger than the refractive index of the second liquid.
According to another aspect of the present invention, the present invention further provides a lens assembly comprising:
a zoom lens;
at least one lens unit; and
an actuator, wherein the at least one lens unit and the zoom lens are disposed along a same optical axis direction, the zoom lens comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set includes a first electrode and a second electrode, the second electrode extends from the base to the inside of the accommodating space, the second electrode is in contact with the second liquid, the first electrode is wrapped by the base and insulated from the second liquid, the driver is electrically connected to the electrode set, and an external voltage is applied to the first electrode and the second electrode of the electrode set through the driver to adjust the curvature of the optical interface between the first liquid and the second liquid.
According to another aspect of the present invention, the present invention further provides a camera module, including:
a lens assembly;
the lens assembly is arranged along a photosensitive path of the photosensitive assembly; and
a driving device, wherein the driving device is connected to the photosensitive assembly in a transmission manner, the driving device drives the photosensitive assembly to move, and the lens assembly includes:
a zoom lens;
at least one lens unit; and
an actuator, wherein the at least one lens unit and the zoom lens are disposed along a same optical axis direction, the zoom lens comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set 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 in contact with the second liquid, the first electrode is wrapped by the base and insulated from the second liquid, the driver is electrically connected with the electrode set, and external voltage is applied to the first electrode and the second electrode of the electrode set through the driver to adjust the curvature of the optical interface between the first liquid and the second liquid.
According to an embodiment of the present 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 the light incident direction, and the light turning element adjusts a direction of the light path.
According to an embodiment of the present invention, the lens assembly includes a variable power group lens assembly and a compensation group lens assembly, wherein the variable power group lens assembly and the compensation group lens assembly are coaxially disposed along the same optical axis, wherein the variable power group lens assembly is used for actively adjusting a focal length, and the compensation group lens assembly is used for compensating for a zooming of the optical system caused by the variable power group lens assembly.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description and the accompanying drawings.
Drawings
Fig. 1 is a schematic overall structure diagram 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 diagrams illustrating a method for manufacturing the zoom lens according to the first preferred embodiment of the invention.
Fig. 4 is a schematic overall structure diagram of a lens assembly according to a first preferred embodiment of the invention.
Fig. 5 is a schematic structural diagram of a camera module according to a first preferred embodiment of the invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as 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 understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular manner of operation, and thus, the terms are not to be construed as limiting the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
A zoom lens according to a first preferred embodiment of the present invention is illustrated in the following description with reference to fig. 1 to 2B of the drawings accompanying the present specification. The zoom lens comprises a base 10, a first liquid 20 and a second liquid 30 held in the base 10, and at least one electrode set 40 disposed 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 this preferred embodiment of the invention, the first liquid 20 is an insulating liquid and the second liquid 30 is a conducting liquid. The first liquid 20 may be, but is not limited to, an oil or oily substance, the second liquid 30 may be, but is not limited to, an aqueous solution, the first liquid 20 and the second liquid 30 contact 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 is worth mentioning 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 influenced by gravity.
The base 10 includes a supporting base 11, set up in a first base plate 12 and a second base plate 13 of supporting base 11, wherein first base plate 12 set up in supporting base 11's income light side, second base plate 13 set up in supporting base 11's play light side, light warp promptly first base plate 12 enters into base 10 accommodation space 100, and light certainly accommodation space 100 warp second base plate 13 is to the play light side outgoing. The supporting 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 at the light incident side of the base 10, the second liquid 30 is held at the light emergent side of the base 10, and light enters the first liquid 20 through the first substrate 12, is refracted through the first liquid 20, reaches the second liquid 30 through the optical interface 101, is refracted through the second liquid 30, and then exits through the second substrate 13.
Preferably, in the preferred embodiment of the present invention, the first substrate 12 and the second substrate 13 are optically transparent materials. By way of example, in the preferred embodiment of the present 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 supporting base 11, the second electrode 42 extends from the supporting base 11 to the accommodating space 100 of the base 10, and the second electrode 42 can be electrically connected 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 through a molding process. The first electrode 41 and the second electrode 42 of the electrode group 40 are embedded in the support base 11, so that the electrode group 40 and the support base 11 are of an integrated structure.
The first liquid 20 and the second liquid 30 are held in the accommodating space 100 of the base 10, the second liquid 30 is in contact with the second electrode 42 of the electrode assembly 40, the first liquid 20 is located on the light incident side of the base 10, the first liquid 20 is separated 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 is understood that the shape of the optical interface 101 is merely exemplary and not limiting, and that the shape of the optical interface 101 varies with the choice of materials for the first liquid 20 and the second liquid 30. Due to the different refractive indices of the materials of the first liquid 20 and the second liquid 30, the first liquid 20 and the second liquid 30 can perform optical path transformation on light passing through the optical interface 101, and therefore, the 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 the direction of the optical path.
It is worth mentioning that the edge of the optical interface 101 formed by the first liquid 20 and the second liquid 30 is located on the inner sidewall of the base 10, i.e. the edge of the optical interface 101 intersects the inner sidewall of the base 10. Therefore, when the surface shape of the optical interface 101 changes, the intersection position of the optical interface 101 and the inner wall of the base 10 changes correspondingly to adapt to the surface shape of the optical interface 101.
Preferably, in this preferred embodiment of the present invention, the refractive indices 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 electrode 41 and the second electrode 42 of the electrode assembly 40 are conductive metals, and the first electrode 41 and the second electrode 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 can be understood that the first electrode 41 and the second electrode 42 of the electrode assembly 40 are fixed by the support base 11 through in-mold injection, so that the relative position stability of the electrode assembly 40 can be improved, the electrode assembly 40 is prevented from being deviated due to the influence of vibration, and the stability of the product operation is improved.
The supporting base 11 has an inner sidewall 110, a light inlet 120 formed at the light inlet side of the supporting base 11, and a light outlet 130 formed at the light outlet side of the supporting base 11, wherein the substrate 12 is disposed at the light inlet 120 of the supporting base 11, and the second substrate 13 is disposed at the light outlet 130 of the supporting base 11.
Preferably, the inner side surface formed by the inner side wall 110 of the supporting base 11 is an inclined surface, wherein the inner side wall 110 of the supporting base 11 extends from the light outlet 130 to the light inlet side of the supporting base 11 obliquely and outwardly, so that the supporting base 11 converges the external light to enter the accommodating space 100 of the supporting 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 and second inlay 411, 412 of the first electrode 41 are covered or wrapped by the support base 11, whereby the support base 11 fixes the first and second inlay 411, 412 of the first electrode 41.
The support base 11 is wrapped on 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 prevent 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 to electrically insulate 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 required between the first electrode 41 and the second liquid 30, which is beneficial to simplify 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 main body 421 and an inner contact point 422 and an outer contact point 423 integrally extending from the second electrode main body 421, wherein the second electrode main body 421 of the second electrode 42 is disposed in the supporting base 11, the inner contact point 422 of the second electrode main body 42 extends from the second electrode main body 421 to the inner side to the accommodating space 100, and the inner contact point 422 of the second electrode main body 42 contacts with the second liquid 30. The outer 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 outer contact 423.
Preferably, in this preferred embodiment of the present invention, the second electrode 42 is arranged at the light exit 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 exit 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 and opens toward 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 at the light exit side of the second electrode 42, and the second electrode 42 is further fixed and supported by the second substrate 13 to maintain the second electrode 42 in contact with the second liquid 30.
As shown in fig. 2A and 2B, by using the electrowetting effect, the change of the surface curvature of the optical interface 101 between the first liquid 20 and the second liquid 30 can be adjusted 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 voltage or the 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 incident side, and light is diffused outward through the optical interface 101. In short, when not energized, the liquid-liquid interface is convex, thereby diffusing light passing through the interface.
When electricity is applied between the first electrode 41 and the second electrode 42 of the electrode group 40, an optical interface 101 between the first liquid 20 and the second liquid 30 is projected toward the light exit side, and light rays are converged inwards through the optical interface, under the change of the electrowetting effect. That is, when a voltage is applied by energization, the direction of the bend changes from one curved surface to another, resulting from the change in the wetting characteristics of the surface by the applied voltage, and the response causes the fluid position to change. The interface is concave so that light rays passing through the interface converge. The change in surface type between the first liquid 20 and the second liquid 30 is merely exemplary and not limiting.
It will be appreciated that the varying curvature of the interface 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 zoom lens as described above:
according to the Lippmann-Young equation, the interfacial force balance relation among the liquid 1, the liquid 2 and the dielectric layer is as follows:
wherein gamma is 12 Is the surface tension between liquid 1 and liquid 2, θ 0 Is the initial contact angle, θ, with no voltage applied 01 Is the contact angle when a voltage is applied, d is the thickness of the dielectric layer, and e = e 0 ε r Is the dielectric constant and U is the external voltage applied to the two electrodes. When the external force exerted on the liquid reaches equilibrium, the following formula is satisfied:
F+γ D2 ＝γ 12 cosθ 1 +γ 1D
wherein F represents the electric power per meter, γ D2 Is the surface tension, gamma, between the dielectric layer and the liquid 2 1D Is the surface tension between the liquid 1 and the dielectric layer.
Referring to fig. 3A to 3D of the drawings in the present specification, a method for manufacturing a zoom lens according to a preferred embodiment of the present invention is shown, wherein the method for manufacturing the zoom lens includes the steps of:
(a) Placing an electrode assembly 40 in a mold, wherein the electrode assembly 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 volume of a first liquid 20 and a second volume of 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 on one side of the support base 11, wherein the hole is communicated with the accommodating space 100 of the support base 11, so that the first liquid and the second liquid are put into the accommodating space 100 through the hole.
Referring to fig. 4 of the drawings accompanying this specification, a lens assembly 1000 according to another aspect of the present invention is set forth in the description that follows. The lens assembly 1000 includes any one of the zoom lenses 200, at least one lens unit 300, and an actuator 400 electrically connected to the zoom lens 200, wherein the lens unit 300 and the zoom lens 200 are disposed along a 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 incidence 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 conducted by the driver 400 to apply an external voltage to the first electrode 41 and the second electrode 42 of the electrode group 40 through the driver 400, thereby adjusting the change in the 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 can be, but is not limited to, a glass lens or a plastic lens, wherein the specific type of the lens unit 300 is only used as an example and is not limited thereto.
It can be understood that the lens assembly 1000 according to the preferred embodiment of the present invention does not need a driving device to drive any lens to move during focusing or zooming, which simplifies the structure of the lens and reduces the overall manufacturing cost. 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 shaking caused by movement is avoided, and the shooting quality is improved.
Referring to fig. 5 of the drawings of the present specification, according to another aspect of the present invention, the present invention further provides a camera module, wherein the camera module comprises 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 in transmission connection with the photosensitive assembly 2000, and the driving device 3000 drives the photosensitive assembly 2000 to move, so as to make an image clear.
It should be noted that in the preferred embodiment of the present invention, the camera module is a periscopic camera module, and accordingly, the camera module further includes a light turning element 4000, wherein the light turning element 4000 is disposed at the front end of the lens assembly 1000 in the light incident direction, and the light path direction is adjusted by the light turning element 4000.
In the preferred embodiment of the present invention, the lens assembly 1000 further comprises a zoom lens assembly 1000a and a compensation lens assembly 1000b, wherein the zoom lens assembly 1000a and the compensation lens assembly 1000b are coaxially disposed along the same optical axis, wherein the zoom lens assembly 1000a is used for actively adjusting the focal length, and the compensation lens assembly 1000b is used for compensating the zoom of the optical system caused by the zoom lens assembly 1000 a.
It is understood that the variable magnification group lens unit 1000a and the compensation group lens unit 1000b have the same structure as the lens unit 1000 described above, wherein the variable magnification group lens unit 1000a is disposed at the front end of the compensation group lens unit 1000b in the light incident direction. The zoom lens 200a of the variable magnification group lens unit 1000a is used for active zooming of the camera module; the zoom lens 200b of the compensation group lens assembly 1000b is used for the camera module to compensate for the zooming of the optical system caused by the variable magnification group lens assembly 1000 a. 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 photosensitive assembly 2000 can clearly image.
It will be understood by those skilled in the art that in this process, it is not necessary to move the positions of the variable power group lens assembly 1000a and the compensation group lens assembly 1000b, and it is not necessary to provide a driving means for driving the lens groups to move. Therefore, on the premise of ensuring the zoom function, the whole structure of the camera module can be greatly simplified, and the manufacturing cost is reduced; meanwhile, the lens group is prevented from shaking in the moving process, and the image quality shooting effect is improved.
In addition, it can be understood that, through the structural improvement of the zoom lens 200, the optical power is raised, and the zoom lens 200 of the zoom group lens assembly 1000a and the compensation group lens assembly 1000b realizes the zoom capability of the camera module without a zoom motor. Therefore, the module cost and the manufacturing difficulty can be greatly reduced under the condition of only keeping the AF motor.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (19)
1. A zoom lens, comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set includes 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 in contact with the second liquid, and the first electrode is wrapped by the base and insulated from the second liquid.
2. The zoom lens of claim 1, wherein the base comprises a support base, 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, the second substrate is disposed on the light emergent side of the support base, and the accommodation space is formed by the support base, the first substrate and the second substrate.
3. Zoom lens according to claim 2, wherein the support base is integrally molded by injection molding, the first and second electrodes of the electrode group being embedded in the support base, whereby the support base fixes and supports the first and second electrodes.
4. Zoom lens of claim 3, wherein 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 outward from the support base.
5. Zoom lens of claim 4, wherein the support base has an inner sidewall, the first inlay of the first electrode is parallel to the inner sidewall, a dielectric layer is formed by the support base between the first inlay of the first electrode and the inner sidewall, wherein the dielectric layer is an insulating material, whereby the dielectric layer electrically insulates the first liquid and the second liquid from the first electrode.
6. Zoom lens according to claim 4 or 5, wherein the second electrode comprises 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 built into the support base, the inner contact point of the second electrode body extends from the second electrode body to the inside to the accommodation space, and the outer contact point of the second electrode extends from the second electrode body to the outside.
7. Zoom lens according to claim 6, wherein 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 the refractive indices of the first liquid and the second liquid are different.
8. Zoom lens according to claim 6, wherein the refractive index of the first liquid is greater than the refractive index of the second liquid.
9. A lens assembly, comprising:
a zoom lens;
at least one lens unit; and
an actuator, wherein the at least one lens unit and the zoom lens are disposed along a same optical axis direction, the zoom lens comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible, and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set 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 in contact with the second liquid, the first electrode is wrapped by the base and insulated from the second liquid, the driver is electrically connected with the electrode set, and external voltage is applied to the first electrode and the second electrode of the electrode set through the driver to adjust the curvature of the optical interface between the first liquid and the second liquid.
10. The lens assembly of claim 9, wherein the base comprises a supporting base, a first substrate and a second substrate disposed on the supporting base, wherein the first substrate is disposed on the light incident side of the supporting base, the second substrate is disposed on the light emergent side of the supporting base, and the accommodating space is formed by the supporting base, the first substrate and the second substrate.
11. The lens assembly of claim 10, wherein the support base is integrally molded by injection molding, the first and second electrodes of the electrode set being embedded in the support base, whereby the support base secures and supports the first and second electrodes.
12. The lens assembly of claim 11, wherein 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 outward from the support base.
13. The lens assembly of claim 12, wherein 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.
14. The lens assembly of claim 12 or 13, wherein the second electrode comprises 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 embedded in the support base, the inner contact point of the second electrode body extends from the second electrode body to the inside to the accommodating space, and the outer contact point of the second electrode extends from the second electrode body to the outside.
15. The lens assembly of claim 14, wherein the first liquid is held at the light entry side of the support substrate, the second liquid is held at the light exit side of the support substrate, and the refractive indices of the first liquid and the second liquid are different.
16. The lens assembly of claim 14, wherein the refractive index of the first liquid is greater than the refractive index of the second liquid.
17. A camera module, comprising:
a lens assembly;
the lens assembly is arranged along a photosensitive path of the photosensitive assembly; and
a driving device, wherein the driving device is in transmission connection with the photosensitive component, the driving device drives the photosensitive component to move, and the lens assembly comprises:
a zoom lens;
at least one lens unit; and
an actuator, wherein the at least one lens unit and the zoom lens are disposed along a same optical axis direction, the zoom lens comprising:
the base is provided with a closed accommodating space;
a first liquid and a second liquid, the first liquid and the second liquid being held in the accommodating space of the base, the first liquid being an insulating liquid, the second liquid being a conductive liquid, so that the first liquid and the second liquid are immiscible and an optical interface is formed between the first liquid and the second liquid; and
at least one electrode set, wherein the at least one electrode set is disposed in the base, the electrode set includes a first electrode and a second electrode, the second electrode extends from the base to the inside of the accommodating space, the second electrode is in contact with the second liquid, the first electrode is wrapped by the base and insulated from the second liquid, the driver is electrically connected to the electrode set, and an external voltage is applied to the first electrode and the second electrode of the electrode set through the driver to adjust the curvature of the optical interface between the first liquid and the second liquid.
18. The camera module of claim 17, further comprising a light turning element, wherein the light turning element is disposed at a front end of the lens assembly in the light incident direction, and the light path is adjusted by the light turning element.
19. The camera module of claim 17, wherein the lens assembly comprises a variable power group lens assembly and a compensation group lens assembly, wherein the variable power group lens assembly and the compensation group lens assembly are coaxially disposed along a same optical axis, wherein the variable power group lens assembly is used to actively adjust a focal length, and the compensation group lens assembly is used to compensate for a zoom of the optical system caused by the variable power group lens assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110654099.7A CN115469387A (en) | 2021-06-11 | 2021-06-11 | Zoom lens, lens assembly and camera module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110654099.7A CN115469387A (en) | 2021-06-11 | 2021-06-11 | Zoom lens, lens assembly and camera module |
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