CN110806610A - Aberration correction zoom lens - Google Patents

Abstract

An aberration-corrected zoom lens, which includes a ring-shaped piezoelectric driving layer, a thin transmission deformation layer, a liquid medium, a ring-shaped fixed support structure, a rigid plane glass, a soft elastic film, an anti-reflection film and a servo driving mechanism; the ring-shaped piezoelectric The driving layer is fixed on the outer side of the thin transmission deformation layer, the inner side of the thin transmission deformation layer is fixed on one end surface of the annular fixed support structure, the soft elastic film is fixed inside the lower end of the annular fixed support structure, and the airtight inner cavity is filled with There is a colorless liquid medium with high transmittance; the servo drive mechanism is fixed on the other end of the annular fixed support structure; the outer center of the thin transmission deformation layer is coated with an anti-reflection film, and the area where the annular piezoelectric drive layer is fixed is not fixed. The area coated with the anti-reflection film and the area covered by the non-ring gasket in the middle of the soft elastic film is the working area of the zoom lens, and the middle part of the servo drive mechanism is the light-transmitting area. The present invention is used for optical zoom imaging.

Description

An aberration-corrected zoom lens

technical field

The invention belongs to the field of optical devices, and relates to an aberration correction zoom lens.

Background technique

The traditional optical zoom imaging system is a combination of a series of lenses made of transparent materials such as resin or glass with a fixed focal length, which has the disadvantages of complex structure, bulky volume, severe mechanical wear, and difficult processing, and can no longer meet the requirements of intelligent optics. Equipment requirements for automated, intelligent and miniaturized optical zoom systems. However, the flexible zoom lens is only composed of a variable zoom lens, which has attracted extensive attention of scholars at home and abroad. The flexible zoom lens is usually composed of a transparent elastic film and a transparent fluid medium, etc., which is realized by changing the curvature radius of the surface of the transparent elastic film. The focal length adjustment of the optical system has achieved great success, but the existence of the gravity of the transparent fluid medium and the uneven distribution of the medium will introduce aberrations, which will greatly affect the imaging effect.

SUMMARY OF THE INVENTION

The present invention provides a zoom lens with aberration correction function in order to overcome the deficiencies of the prior art. The zoom lens can effectively correct the aberration caused by the gravity of the liquid and the uneven distribution of the medium and other common optical aberrations, and further improve the quality of the imaging system.

The technical scheme of the present invention is:

An aberration-correcting zoom lens, which includes an annular piezoelectric drive layer, a thin transmission deformation layer, a liquid medium, an annular fixed support structure, a rigid plane glass, a soft elastic film, an anti-reflection film and a servo drive mechanism;

The annular piezoelectric driving layer is fixed on the outer side of the thin transmission deformation layer, the inner side of the thin transmission deformation layer is fixed on one end surface of the annular fixed support structure, the soft elastic film is fixed inside the lower end of the annular fixed support structure, and the thin transmission deformation layer is fixed on the inner side of the annular fixed support structure. The deformation layer, the soft elastic film and the annular fixed support structure enclose a closed cavity, the closed cavity is filled with a colorless and highly transmissive liquid medium, and the rigid flat glass is embedded in the annular fixed support structure to isolate The inner cavity forms two chambers filled with liquid medium; the servo drive mechanism is fixed on the other end of the annular fixed support structure, and the output end of the servo drive mechanism is fixed with one side of the annular gasket; the The other side of the annular gasket is located under the outer side of the soft elastic film, and the soft elastic film is pressed by the annular gasket driven by the servo drive mechanism, and the curvature radius of the soft elastic film is changed;

The outer center of the thin transmissive deformation layer is coated with an anti-reflection film, and the area where the annular piezoelectric driving layer is fixed is coated. The middle of the driving mechanism is the light-transmitting area.

Compared with the prior art, the present invention has the following beneficial effects:

The aberration-correcting zoom lens of the present invention can realize adjustable focal length in a wide range, the rigid flat glass divides the entire inner cavity into two independent chambers, and the soft elastic film changes its surface curvature radius under the extrusion of the annular gasket. The servo drive mechanism can change the surface shape of the soft elastic film, thereby changing the focal length of the lens. By introducing a multi-actuator adaptive structure based on single piezoelectric drive, the aberration caused by the gravity of the filling liquid and the uneven distribution of the medium and other common optical aberrations can be effectively corrected, and the quality of the imaging system can be further improved.

Description of drawings

1 is a schematic structural diagram of a zoom lens with aberration correction function in an embodiment of the present invention;

2 is a schematic diagram of a zoom lens with an aberration correction function for adjusting focal length in an embodiment of the present invention;

3 is a schematic diagram of aberration correction of a zoom lens with aberration correction function in an embodiment of the present invention;

FIG. 4 is a schematic diagram of low-order aberrations.

In the figure, 1. Ring piezoelectric driving layer, 2. Discrete multi-ring sector array electrode layer, 3. Piezoelectric ceramic sheet, 4. Ring electrode layer, 5. Thin transmission deformation layer, 6. Ring-shaped fixed support structure, 7 , liquid medium, 8, rigid flat glass, 9, soft elastic film, 10, ring gasket, A11, voice coil motor push rod, A12, ring voice coil motor, 13, anti-reflection film.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The directions indicated by the hollow arrows in Fig. 1-Fig. 3 are the directions of the light beams.

As shown in FIG. 1, an aberration-corrected zoom lens includes a ring-shaped piezoelectric driving layer 1, a thin transmission deformation layer 5, a liquid medium 7, a ring-shaped fixed support structure 6, a rigid flat glass 8, a soft elastic film 9, an increasing Permeable membrane 13 and servo drive mechanism A;

The annular piezoelectric driving layer 1 is fixed on the outer side of the thin transmission deformation layer 5, the inner side of the thin transmission deformation layer 5 is fixed on one end surface of the annular fixed support structure 6, and the soft elastic film 9 is fixed on the annular fixed support structure. 6 Inside the lower end, the annular piezoelectric driving layer 1, the soft elastic film 9 and the annular fixed support structure 6 enclose a closed cavity, and the closed cavity is filled with a colorless and highly transmissive liquid medium 7, and the rigid The plane glass 8 is inlaid inside the annular fixed support structure 6 to isolate the inner cavity to form two chambers filled with liquid medium 7; the servo drive mechanism A is fixed on the other end of the annular fixed support structure 6, and the servo drive mechanism The output end of A is fixed to one side of the annular gasket 10; the other side of the annular gasket 10 is located below the outer side of the soft elastic film 9, and the soft elastic film 9 drives the annular gasket 10 through the servo drive mechanism A. Under extrusion, the curvature radius of the soft elastic film 9 is changed;

The outer center of the thin transmissive deformation layer 5 is coated with an anti-reflection film 13 without the fixed area of the annular piezoelectric driving layer 1 , and the area covered with the anti-reflection film 13 and the soft elastic film 9 without an annular gasket 10 covers the area for zooming The working area of the lens, the middle of the servo drive mechanism A is the light-transmitting area. The anti-reflection film 13 is a thin film that enhances the transmittance of the light beam. The light energy is lost due to the reflection on the surface of the element. In order to reduce the reflection loss on the surface of the element, a transparent medium film is often coated on the surface of the optical element. This film is called an anti-reflection film. , Antireflection coatings are generally plated with magnesium fluoride.

In the above embodiment, as a preferred solution, the annular piezoelectric driving layer 1 includes an annular piezoelectric ceramic sheet 3, a multi-ring sector array electrode layer 2 and an annular electrode layer 4, and the annular piezoelectric ceramic The electrode layer covered on one side of the sheet 3 is a ring electrode layer 4 with the same shape as the piezoelectric ceramic sheet, and the electrode layer covered on the other side is a discrete multi-ring sector array electrode layer 2, and the electrode layers are silver Or an aluminum metal electrode layer, the annular electrode layer 4 is fixed on the outer side of the thin transmissive deformation layer 5 .

Preferably, the annular electrode layer 4 can be bonded on the thin transmission deformation layer 5 through epoxy resin glue. Further, as shown in FIG. 3 , the piezoelectric ceramic sheet 3 of the annular piezoelectric driving layer 1 is deformed after applying a voltage. , the thin transmission deformation layer 5 is bent due to the boundary support, thereby squeezing the deformable and high transmittance liquid medium 7 to deform it, so that the passing beam produces an optical path difference, and a specific surface shape is generated in the middle working area. Through two cavities filled with a colorless liquid medium 7 with high transmittance, various low-order aberrations are corrected due to the existence of optical path differences. By introducing the multi-actuator adaptive lens correction system based on single piezoelectric drive, the aberration caused by the gravity of the liquid or the uneven distribution of the liquid medium can be effectively corrected.

As shown in Figure 4, low-order aberrations such as astigmatism (left image), defocus (middle image), coma (right image), and other common optical aberrations can be effectively corrected and further improved imaging system.

In the above solution, preferably, the thin transmissive deformation layer 5 is plexiglass. The annular fixed support structure 6 is a quartz glass ring. The liquid medium 7 is deionized water, sodium chloride solution, mineral oil or ammonium sulfate solution. The rigid flat glass 8 is transparent resin glass. The soft elastic film 9 is a PDMS elastic film.

Further, the servo drive mechanism A includes a cylindrical voice coil motor A12 and a voice coil motor push rod A11; one end of the voice coil motor push rod A11 is fixed inside the output end of the cylindrical voice coil motor A12, and the other end of the voice coil motor push rod A11 Fixedly connected to the annular washer 10, the central part of the cylindrical voice coil motor A12 is a hollow cylindrical light-transmitting area.

As shown in FIG. 2 , the cylindrical voice coil motor A12 drives the voice coil motor push rod A11 to move horizontally by controlling the current of the voice coil motor, and the ring washer 10 connected to it moves along with it, and the soft elastic film 9 squeezes the ring washer 10 By changing the surface curvature radius, by controlling the current of the annular voice coil motor 12, the surface curvature of the soft elastic film 9 can be changed, and then the focal length of the lens can be changed to achieve a wide range of focal length changes. Control the input current to achieve precise positioning.

The diameter of the area coated with the anti-reflection film is smaller than the inner diameter of the area covered by the non-ring gasket 10 in the middle of the soft elastic film 9, and the inner diameter of the annular gasket 10 is smaller than the inner diameter of the cylindrical light-transmitting area of the cylindrical voice coil motor A12. This setting ensures that the light beam can pass through effectively and with high transmission, and the imaging quality is ensured.

Example

In above-mentioned technical scheme, expand or be implemented as following embodiment:

Example 1, the annular piezoelectric driving layer 1 adopts an annular piezoelectric ceramic sheet 3 with an inner diameter of 10 mm, an outer diameter of 25 mm, and a thickness of 100 μm, and the upper and lower sides are respectively plated with a metal electrode layer of 5 μm thick silver or aluminum. (respectively, the multi-ring sector array electrode layer 2 and the ring electrode layer 4).

In Example 2, the thin transmissive deformation layer 5 has a diameter of 30 mm and a thickness of 150 μm, and the material can be made of plexiglass. This embodiment as a single embodiment or in combination with embodiment 1.

In Example 3, the thickness of the rigid flat glass 8 is 2 mm to isolate the inner cavity into two independent chambers, and the thickness of the colorless liquid medium 7 with high transmittance is 5-10 mm. Wherein, the rigid plane glass 8 can be selected from transparent resin glass, and the liquid medium 7 can be selected from any one of these transparent solutions in deionized water, sodium chloride solution, mineral oil or ammonium sulfate solution. This embodiment acts as a single embodiment or in combination with Embodiments 1 and 2.

In Example 4, the soft elastic film 9 is a PDMS elastic film with a diameter of 18 mm and a thickness of 2 mm. The PDMS elastic film is fixed on the annular fixed support structure 6 in an adhesive manner. This embodiment acts as a single embodiment or in any combination with Embodiments 1, 2 and 3.

Example 5, the inner diameter of the annular gasket 10 is 10 mm, and the outer diameter is 14 mm, the annular voice coil motor 12 is a commercially available motor, and the diameter of the inner light-transmitting area is 14 mm. Due to the gravity of the internal liquid medium 7, the PDMS elastic film 9 will produce a convex curved surface, which will introduce common optical aberrations such as defocus or coma. This embodiment as a single embodiment or any combination of this embodiment with Embodiment 4 and Embodiments 1, 2 and 3.

working principle

The zoom lens with aberration correction is divided into two independent cavities by a rigid flat glass in the middle. It is based on an elastic polymer tunable lens driven by a ring-shaped voice coil motor, and PDMS elastic film is squeezed by a ring-shaped gasket. By changing the radius of curvature of its surface and controlling the current of the voice coil motor, the surface curvature of the PDMS elastic film can be changed, and then the focal length of the lens can be changed to achieve a wide range of focal length changes. The multi-actuator driven by the annular piezoelectric driving layer is deformed after applying a voltage, so that the thin transmission deformation layer is bent, thereby squeezing the deformable transmission medium to deform it, and the thickness of the deformable transmission medium changes to generate an optical path for the passing beam. In order to achieve the purpose of correcting the aberration, it can effectively correct the aberration caused by the gravity of the liquid itself or the uneven distribution of the liquid medium.

The present invention has been disclosed above with preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, has done the above implementation cases. Any simple modifications, equivalent changes and modifications still fall within the scope of the technical solution of the present invention.

Claims (9)

1. an aberration correction zoom lens, it is characterized in that: it comprises annular piezoelectric driving layer (1), thin transmission deformation layer (5), liquid medium (7), annular fixed support structure (6), rigid plane glass (8), a soft elastic film (9), an anti-reflection film (13) and a servo drive mechanism (A); The annular piezoelectric driving layer (1) is fixed on the outer side of the thin transmission deformation layer (5), and the inner side of the thin transmission deformation layer (5) is fixed on one end surface of the annular fixed support structure (6). The film (9) is fixed inside the lower end of the annular fixed support structure (6), and the annular piezoelectric driving layer (1), the soft elastic film (9) and the annular fixed support structure (6) enclose a closed inner cavity, and the closed inner cavity is formed. The cavity is filled with a colorless and highly transmissive liquid medium (7), and the rigid flat glass (8) is embedded inside the annular fixed support structure (6) to isolate the cavity to form two liquid-filled mediums (7) the chamber; the servo drive mechanism (A) is fixed on the other end of the annular fixed support structure (6), and the output end of the servo drive mechanism (A) is fixedly connected to one side of the annular gasket (10); The other side of the annular gasket (10) is located below the outer side of the soft elastic film (9), and the soft elastic film (9) is soft and elastic under the pressing of the annular gasket (10) driven by the servo drive mechanism (A). The radius of curvature of the membrane (9) is changed; An anti-reflection film (13) is plated on the outer center of the thin transmissive deformation layer (5) where the annular piezoelectric driving layer (1) is fixed, and the area plated with the anti-reflection film (13) and the soft elastic film (9 ) The coverage area of the non-ring washer (10) in the middle is the working area of the zoom lens, and the middle part of the servo drive mechanism (A) is the light-transmitting area. 2. An aberration correction zoom lens according to claim 1, characterized in that: the annular piezoelectric driving layer (1) comprises an annular piezoelectric ceramic sheet (3), a multi-ring sector array electrode layer (2) ) and a ring-shaped electrode layer (4), the electrode layer covered on one side of the annular piezoelectric ceramic sheet (3) is a ring-shaped electrode layer (4) with the same shape as the piezoelectric ceramic sheet, and the other side is covered with a ring-shaped electrode layer (4). The electrode layer is a discrete multi-ring sector array electrode layer (2), the electrode layers are all silver or aluminum electrode layers, and the ring electrode layer (4) is fixed on the outer side of the thin transmission deformation layer (5). 3. The aberration correction zoom lens according to claim 1 or 2, wherein the thin transmission deformation layer (5) is made of organic glass. 4 . The aberration correction zoom lens according to claim 3 , wherein the annular fixed support structure ( 6 ) is a quartz glass ring. 5 . 5 . The aberration-correcting zoom lens according to claim 1 , wherein the liquid medium ( 7 ) is deionized water, sodium chloride solution, mineral oil or ammonium sulfate solution. 6 . 6 . The aberration correction zoom lens according to claim 5 , wherein the rigid flat glass ( 8 ) is transparent resin glass. 7 . 7. The aberration correction zoom lens according to claim 1, 2, 4 or 6, characterized in that: the soft elastic film (9) is a PDMS elastic film. 8. The aberration correction zoom lens according to claim 7, wherein the servo drive mechanism (A) comprises a cylindrical voice coil motor (A12) and a voice coil motor push rod (A11); a voice coil motor push rod One end of (A11) is fixed on the inner side of the moving part of the cylindrical voice coil motor (A12), the other end of the voice coil motor push rod (A11) is fixed with the annular washer (10), and the middle of the cylindrical voice coil motor (A12) is a cylindrical light area. 9. An aberration-correcting zoom lens according to claim 8, characterized in that: the diameter of the area coated with the anti-reflection film is smaller than the inner diameter of the area covered by the non-ring gasket (10) in the middle of the soft elastic film (9), and the annular gasket The inner diameter of (10) is smaller than the inner diameter of the cylindrical light-transmitting area of the cylindrical voice coil motor (A12).

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