阅读说明：本技术 一种基于压电陶瓷管驱动的变焦镜 (Zoom lens based on piezoelectric ceramic tube driving ) 是由 代超宜 马剑强 崔玉国 娄军强 于 2019-11-19 设计创作，主要内容包括：一种基于压电陶瓷管驱动的变焦镜,它包括镜面层、压电陶瓷管组件、玻璃支撑结构以及介质膜；所述压电陶瓷管组件包括同轴套装的内外压电陶瓷管,内压电陶瓷管外径小于外压电陶瓷管的内径,镜面层固接在压电陶瓷组件的一端面,压电陶瓷组件的另一端面固接在玻璃支撑架构上,镜面层上镀有作为工作区域的介质膜。本发明采用压电陶瓷管横向伸长作为驱动,在压电陶瓷管内外壁之间施加电压时,将产生轴向方向的位移,且变形量随着压电陶瓷管长度的增加而增加,这种致动器能产生较大的变形,结构紧凑。(A zoom lens based on piezoelectric ceramic tube drive comprises a mirror surface layer, a piezoelectric ceramic tube assembly, a glass supporting structure and a dielectric film; the piezoelectric ceramic tube component comprises an inner piezoelectric ceramic tube and an outer piezoelectric ceramic tube which are coaxially sleeved, the outer diameter of the inner piezoelectric ceramic tube is smaller than the inner diameter of the outer piezoelectric ceramic tube, a mirror surface layer is fixedly connected to one end face of the piezoelectric ceramic component, the other end face of the piezoelectric ceramic component is fixedly connected to the glass supporting framework, and a dielectric film serving as a working area is plated on the mirror surface layer. The invention adopts the transverse extension of the piezoelectric ceramic tube as the drive, when voltage is applied between the inner wall and the outer wall of the piezoelectric ceramic tube, the axial displacement is generated, the deformation amount is increased along with the increase of the length of the piezoelectric ceramic tube, and the actuator can generate larger deformation and has compact structure.)

1. A zoom lens based on piezoelectric ceramic tube drive is characterized in that: the piezoelectric ceramic tube comprises a mirror layer (1), a piezoelectric ceramic tube assembly, a glass supporting structure (11) and a dielectric film (12);

the piezoelectric ceramic tube component comprises an inner piezoelectric ceramic tube and an outer piezoelectric ceramic tube which are coaxially sleeved, the outer diameter of the inner piezoelectric ceramic tube (9) is smaller than the inner diameter of the outer piezoelectric ceramic tube (5), a mirror surface layer (1) is fixedly connected to one end face of the piezoelectric ceramic component, the other end face of the piezoelectric ceramic component is fixedly connected to a glass supporting framework (11), and a dielectric film (12) serving as a working area is plated on the mirror surface layer (1).

2. A zoom lens based on piezo-ceramic tube drive as claimed in claim 1, wherein: the polarization directions of the inner piezoelectric ceramic tube (9) and the outer piezoelectric ceramic tube (5) are the radial wall thickness directions.

3. A zoom lens based on piezo-ceramic tube drive according to claim 1 or 2, wherein: the zoom lens is a reflection type zoom lens, and the mirror surface layer is a circular polished silicon wafer with reflection performance; the internal piezoelectric ceramic tube (9) is not filled with filler or filled with water-cooling liquid, and the dielectric film (2) is a film for enhancing the reflectivity of light beams.

4. A zoom lens based on piezo-ceramic tube drive according to claim 1 or 2, wherein: the zoom lens is a transmission type zoom lens, and the mirror surface layer is an elastic polymer film with transmission performance; the inner piezoelectric ceramic tube (9) is filled with colorless liquid with transmission performance, and the dielectric film (2) is a film for enhancing the light beam transmittance.

5. A zoom lens based on piezoelectric ceramic tube drive is characterized in that: the piezoelectric ceramic tube comprises a mirror layer (1), a piezoelectric ceramic tube, a copper tube (13), a glass supporting structure (11) and a dielectric film (12);

the piezoelectric ceramic tube (16) and the copper tube (13) are coaxially sleeved and provided with a gap, the piezoelectric ceramic tube (16) is used as a single driving structure, the copper tube (13) is used as a fixed structure, the mirror surface layer (1) is fixedly connected to one end face of the piezoelectric ceramic tube (16) and one end face of the copper tube (13), the other end face of the piezoelectric ceramic tube (16) and the other end face of the copper tube (13) are fixedly connected to the glass supporting framework (11), and the mirror surface layer (1) is plated with a dielectric film (12) used as a working area.

6. A zoom lens based on piezo-ceramic tube drive according to claim 5, wherein: the polarization direction of the piezoelectric ceramic tube (16) is along the radial wall thickness direction.

7. A zoom lens based on piezo-ceramic tube drive according to claim 5 or 6, wherein: the copper tube (13) is sleeved outside the piezoelectric ceramic tube (16), or the piezoelectric ceramic tube (16) is sleeved outside the copper tube (13).

8. A zoom lens based on piezo-ceramic tube drive according to claim 7, wherein: the zoom lens is a reflection type zoom lens, and the mirror surface layer is a circular polished silicon wafer with reflection performance; the built-in piezoelectric ceramic tube (16) or the copper tube (13) is filled with no filler or water-cooling liquid; the dielectric film (2) is a thin film for enhancing the reflectivity of the light beam.

9. A zoom lens based on piezo-ceramic tube drive according to claim 7, wherein: the zoom lens is a transmission type zoom lens, and the mirror surface layer is an elastic polymer film with transmission performance; a colorless liquid with transmission performance is filled in a piezoelectric ceramic tube (16) or a copper tube (13) which is used as an inner tube; the dielectric film (2) is a thin film for enhancing the light beam transmittance.

10. A zoom lens based on piezo-ceramic tube drive as claimed in claim 9, wherein: the glass support structure (11) is a planar lens with transmission properties.

Technical Field

The invention belongs to the field of optical devices, and relates to a zoom lens based on piezoelectric ceramic tube driving.

Background

With the development of science and technology, the traditional optical zoom imaging system has the defects of complex structure, heavy volume, serious mechanical abrasion, high processing difficulty and the like, so that the requirements of intelligent optical equipment on an automatic, intelligent and miniature optical zoom system cannot be met.

At present, there are two main types, transmission type and reflection type. The reflective device achieves the change of focal length by changing the curvature of the reflecting surface of the reflector. While transmissive devices such as drop lenses achieve a change in focal length by changing the curvature of the drop surface through electrostatic forces. For example, a focus-adjustable reflector (publication No. CN 105022163a) uses a piezoelectric actuator to compress or expand the gas in the window of the lower substrate when the piezoelectric actuator is deformed by applying a voltage, so as to push the reflector surface to generate arc deformation, thereby achieving the purpose of changing the focus. While transmissive devices such as drop lenses achieve a change in focal length by changing the curvature of the surface or the refractive index of the fill liquid through electrostatic forces. For example, an electronically controlled focusing liquid lens (publication No. CN 109031484a) utilizes sinusoidal ac voltage signals applied to electrodes on the inner and outer sides of a piezoelectric ceramic tube to generate a radial ultrasonic field inside the piezoelectric ceramic tube, so as to change the refractive index of the liquid inside the piezoelectric ceramic tube and further change the focal length of the liquid lens, but the structural principle is complex.

Disclosure of Invention

The invention provides a zoom lens based on piezoelectric ceramic tube driving, aiming at overcoming the defects of the prior art. The invention adopts the transverse extension of the piezoelectric ceramic tube as the drive (d)₃₁Mode drive), when applying voltage between piezoceramics pipe inside and outside wall, will produce the displacement of axial direction, and the deflection increases along with piezoceramics pipe length's increase, and this kind of actuator can produce great deformation, compares the liquid lens of automatically controlled focusing, compact structure.

The technical scheme of the invention is as follows:

the first scheme is as follows: a zoom lens based on piezoelectric ceramic tube drive comprises a mirror surface layer, a piezoelectric ceramic tube assembly, a glass supporting structure and a dielectric film; the piezoelectric ceramic tube component comprises an inner piezoelectric ceramic tube and an outer piezoelectric ceramic tube which are coaxially sleeved, the outer diameter of the inner piezoelectric ceramic tube is smaller than the inner diameter of the outer piezoelectric ceramic tube, a mirror surface layer is fixedly connected to one end face of the piezoelectric ceramic component, the other end face of the piezoelectric ceramic component is fixedly connected to the glass supporting framework, and a dielectric film serving as a working area is plated on the mirror surface layer.

Scheme II: a zoom lens based on piezoelectric ceramic tube drive comprises a mirror surface layer, a piezoelectric ceramic tube, a copper tube, a glass supporting structure and a dielectric film; the piezoelectric ceramic tube and the copper tube are coaxially sleeved and provided with gaps, the piezoelectric ceramic tube is used as a single driving structure, the copper tube is used as a fixing structure, the mirror surface layer is fixedly connected to one end face of the piezoelectric ceramic tube and one end face of the copper tube, the other end face of the piezoelectric ceramic tube and the other end face of the copper tube are fixedly connected to the glass supporting framework, and the mirror surface layer is plated with a dielectric film used as a working area.

Compared with the prior art, the invention has the beneficial effects that:

1) compared with other types of varifocal lenses, the varifocal lens based on the piezoelectric ceramic tube driving greatly simplifies the structural design of an optical system, is compact in structure, is simple to manufacture by adopting a novel driving mode based on the piezoelectric ceramic tube, and is much lower in cost.

2) The zoom lens driven by the piezoelectric ceramic tube can be used as a reflection type zoom lens or a transmission type zoom lens, is suitable for different occasions and different requirements, and has a wide application range.

3) The invention uses piezoelectric transverse elongation as drive (d)₃₁Mode drive), when exerting voltage between interior outer wall, will produce the displacement of axial direction, and the deflection increases along with piezoceramics pipe length's increase, and this kind of actuator can produce great deformation, and will be a lot of low in the cost, compares the liquid lens of automatically controlled focusing, and is also more succinct in structure, has wide application prospect.

Drawings

Fig. 1 is a schematic structural diagram of a reflection type zoom lens based on internal and external piezoelectric ceramic tube driving in embodiment 1 of the present invention;

FIG. 2 is a schematic view showing the operation of the reflection type zoom lens in which the inner piezoelectric ceramic tube is elongated and deformed and the outer piezoelectric ceramic tube is shortened and deformed according to embodiment 1 of the present invention;

FIG. 3 is a schematic view showing the operation of the reflection type zoom lens in which the inner piezoelectric ceramic tube is deformed by shortening and the outer piezoelectric ceramic tube is deformed by extending in example 1 of the present invention;

fig. 4 is a schematic structural diagram of a transmission zoom lens based on internal and external piezoelectric ceramic tube driving in embodiment 2 of the present invention;

FIG. 5 is a schematic view showing the operation of a transmission type zoom lens in which an inner piezoelectric ceramic tube is elongated and deformed and an outer piezoelectric ceramic tube is shortened and deformed in embodiment 2 of the present invention;

FIG. 6 is a schematic diagram showing the operation of a transmission type zoom lens according to embodiment 2 of the present invention, in which the inner piezoelectric ceramic tube is deformed to shorten the length of the tube and the outer piezoelectric ceramic tube is deformed to elongate the tube;

FIG. 7 is a schematic view showing a structure of a piezoelectric ceramic tube and a copper tube combined reflection type zoom lens in example 3 of the present invention;

FIG. 8 is a schematic view showing the operation of a reflection type zoom lens with shortened deformation of a piezoelectric ceramic tube according to embodiment 3 of the present invention;

FIG. 9 is a schematic view showing the operation of a piezoelectric ceramic tube extended and deformed reflection type zoom lens according to embodiment 3 of the present invention;

FIG. 10 is a schematic view showing a configuration of a transmission type zoom lens in which a piezoelectric ceramic tube and a copper tube are combined in embodiment 4 of the present invention;

FIG. 11 is a schematic diagram showing the operation of a piezoelectric ceramic tube extended and deformed transmission type zoom lens according to embodiment 4 of the present invention;

fig. 12 is a schematic diagram showing the operation of a transmission zoom lens with shortened piezoelectric ceramic tube according to embodiment 4 of the present invention.

In the figure, 1, a mirror layer, 2, an inner electrode of an outer piezoelectric ceramic tube, 3, an outer piezoelectric ceramic layer, 4, an outer electrode of the outer piezoelectric ceramic tube, 5, an outer piezoelectric ceramic tube, 6, an inner electrode of the inner piezoelectric ceramic tube, 7, an inner piezoelectric ceramic layer, 8, an outer electrode of the inner piezoelectric ceramic tube, 9, an inner piezoelectric ceramic tube, 10, a liquid medium, 11, a glass supporting structure, 12, a dielectric film, 13, a copper tube, 16 and the piezoelectric ceramic tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The directions of the solid arrows in the figure indicate the direction of travel of the light beam.

Referring to fig. 1, the zoom lens based on piezoelectric ceramic tube driving of the present embodiment includes a mirror layer 1, a piezoelectric ceramic tube assembly, a glass support structure 11, and a dielectric film 12;

the piezoelectric ceramic tube component comprises an inner piezoelectric ceramic tube and an outer piezoelectric ceramic tube which are coaxially sleeved, the outer diameter of the inner piezoelectric ceramic tube 9 is smaller than the inner diameter of the outer piezoelectric ceramic tube 5, a mirror surface layer 1 is fixedly connected to one end face of the piezoelectric ceramic component, the other end face of the piezoelectric ceramic component is fixedly connected to a glass supporting framework 11, and a dielectric film 12 serving as a working area is plated on the mirror surface layer 1.

Principle of operation

Zoom lens based on piezoelectric ceramic tube drive, using piezoelectric transverse elongation as drive (d)₃₁Mode drive), when voltage is applied between the walls of the inner and outer piezoelectric ceramic tubes, the deformation amount is as follows:

ΔL＝d₃₁lE_c(1)

e in the formula (1)_cA driving electric field in the radial direction of the piezoelectric ceramic tube; d₃₁Is a transverse piezoelectric coefficient, which means a direction in which a polarization direction is perpendicular to an external force; l is the length of the piezoelectric ceramic tube. As can be seen from the equation (1), the amount of deformation increases with the increase in the length of the piezoelectric ceramic tube, and the actuator can generate a large deformation. When the piezoelectric ceramic tube driving assembly is two coaxial inner and outer piezoelectric ceramic tubes, the elongation of the outer piezoelectric ceramic tube is greater than that of the inner piezoelectric ceramic tube, and the mirror surface layer 1 is bonded with the two coaxial inner and outer piezoelectric ceramic tubes to drive the whole mirror surface layer 1 to generate a concave surface shape; otherwise, a convex surface shape is generated. The curvature change of the mirror surface layer 1 can be accurately controlled by controlling the difference of the expansion and contraction amounts of the two inner and outer piezoelectric ceramic tubes; when the piezoelectric ceramic tube driving component is formed by coaxially bonding a piezoelectric ceramic tube and a copper tube, the copper tube 13 serves as a fixing mechanism, and the piezoelectric ceramic tube 16 serves as a driving structure to drive the mirror curvature to change.

On one hand, the zoom lens with the structure can take a circular polished silicon chip plated with a high-reflectivity dielectric film as a mirror surface layer 1 and a reflective zoom lens, and the internal cavity is filled with water-cooling liquid for cooling under the working condition of high-energy laser, so that the thermal deformation of the zoom lens can be effectively reduced; on the other hand, the zoom lens with the structure can use the elastic polymer film plated with the high-transmissivity dielectric film as the mirror surface layer 1, the inside of the mirror surface layer is filled with the high-transmissivity colorless liquid, and the polymer film changes the curvature radius of the surface of the polymer film under the action of the piezoelectric ceramic tube and serves as a transmission type zoom lens.