CN110967826B - Optical imaging system and design method - Google Patents
Optical imaging system and design method Download PDFInfo
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- CN110967826B CN110967826B CN201811155116.7A CN201811155116A CN110967826B CN 110967826 B CN110967826 B CN 110967826B CN 201811155116 A CN201811155116 A CN 201811155116A CN 110967826 B CN110967826 B CN 110967826B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
Abstract
The invention discloses an optical imaging system and a design method, relating to the technical field of optical design, wherein the optical imaging system comprises: the liquid crystal lens is positioned at the position of a diaphragm of the optical imaging system, and the aperture of the liquid crystal lens is the diaphragm of the optical imaging system. The liquid crystal lens and the optical system are combined to be designed, the liquid crystal lens is placed at a proper position in the optical system, the entrance pupil diameter of the system is increased through the amplification effect of the front group of lenses, and further the luminous flux of the system is increased; preferably, the liquid crystal lens is placed at the position of the system diaphragm, so that the characteristic of unchanged magnification in the focusing process is realized, and the pupil aberration of the optical system is reduced.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical imaging system comprising a liquid crystal lens and a design method.
Background
With the development of science and technology, the demand of the market for the camera lens of the electronic product is gradually increased. Portable electronic products are increasingly tending to be miniaturized, which limits the overall length of the lens, thereby increasing the difficulty of designing the lens.
In the optical imaging system, the system is generally expected to have a larger entrance pupil diameter, a larger clear aperture, a larger adjustable range of focal power, a faster response speed and a larger transmittance. However, since there is a certain constraint relationship between the optical parameters in the system, it is obvious that these conditions cannot be satisfied simultaneously, so it is necessary to balance these optical variables to make the system satisfy the use requirement as much as possible.
The present invention thus proposes an optical imaging system that allows the diameter of the system's entrance pupil to be increased, while the lateral magnification of the system remains unchanged.
Disclosure of Invention
The invention mainly aims to provide an optical imaging system and a design method thereof, and aims to solve the technical problem that the existing optical imaging system is small in entrance pupil diameter.
To achieve the above object, an aspect of the present invention provides an optical imaging system, including a front group lens, a liquid crystal lens, and a rear group lens, wherein an entrance pupil magnification M of the optical imaging system is:
M＝1/(1-d1*P1)
wherein d is1Is the optical separation of the front group lens and the liquid crystal lens, P1The power of the front group lens.
Further, the liquid crystal lens is located at a position of a diaphragm of the optical imaging system, and an aperture of the liquid crystal lens is the diaphragm of the optical imaging system.
Further, the focal length of the optical system is 16mm, the F/no is 3.2, and the half field angle HFOV is 12.5 degrees.
Further, the front lens group comprises a first lens, a second lens and a third lens, the first lens, the second lens and the object side surface of the third lens are convex surfaces, the image side surface of the first lens, the second lens and the third lens is a concave surface, the rear lens group comprises a fourth lens and a fifth lens, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface.
Further, the optical imaging system further includes an optical filter and an image sensor on the rear group lens side.
Further, the radius of an object plane of the optical imaging system is 12-13, the distance between object planes is 3-3.5, or the radius of the object plane of the optical imaging system is 95-100, and the distance between object planes is 2.5-3, or the radius of the object plane of the optical imaging system is 5.0-5.5, and the distance between object planes is 2.0-2.3, or the radius of the object plane of the optical imaging system is 35.0-35.5, and the distance between object planes is 0.09-0.12, or the radius of the object plane of the optical imaging system is 55-57, and the distance between object planes is 1.7-1.9, or the radius of the object plane of the optical imaging system is 2.5-2.6, and the distance between object planes is 1.0-1.1.
Further, the radius of an object plane of the optical imaging system is-10.0 to-10.5, and the distance between object planes is 2.5 to 3.0, or the radius of the object plane of the optical imaging system is-4.0 to-4.5, and the distance between object planes is 0.09 to 0.11, or the radius of the object plane of the optical imaging system is 6.3 to 6.5, and the distance between object planes is 1.4 to 1.6, or the radius of the object plane of the optical imaging system is 13.4 to 13.6, and the distance between object planes is 0.9 to 1.1.
In another aspect, the present invention further provides a method for designing an optical imaging system, where the optical imaging system includes a front lens group, a liquid crystal lens group, and a rear lens group, the method includes:
placing the liquid crystal lens at a diaphragm of the optical imaging system, wherein the aperture of the diaphragm is the clear aperture of the liquid crystal lens;
the liquid crystal lens is equivalent to an ideal lens and plate glass with a preset thickness, and the entrance pupil magnification and focal power of the optical imaging system are calculated;
simulating front group focal power P corresponding to different entrance pupil magnifications according to design requirements1And system focal power change delta P change relation data;
selecting at least one group of the front group of focal powers P1And optimizing the optical imaging system according to the data of the change relation of the system focal power change delta P.
Further, said selecting at least one of said front set of powers P1And optimizing the optical imaging system according to the system power change delta P change relation data comprises:
simulating by respectively taking the front group lens, the liquid crystal lens and the rear group lens as ideal lenses according to the focal power and the optical interval in the variation relation data;
fixing a front group lens, and materializing a rear group lens, wherein the rear group lens selects 2 optical elements, limits the focal length and the light height of the optical elements, and performs aberration optimization;
fixing a rear group lens materialization system, and materializing a front group lens, wherein the front group lens selects 3 optical elements, limits the focal length and the light height of the optical elements, and performs aberration optimization;
and optimizing the optical imaging system to ensure that the system achieves the preset performance under the condition of meeting the optical structure parameters.
Further, the preset performance is that the transverse magnification of the liquid crystal lens is unchanged in the zooming process, and the optimizing the optical imaging system to enable the system to reach the preset performance under the condition of meeting the optical structure parameters includes:
according to the demonstration of optical theory, the transverse magnification of the liquid crystal lens in the optical imaging system is determined to be unchanged in the zooming process;
and simulating the liquid crystal lens through optical software to ensure that the transverse magnification of the liquid crystal lens is unchanged in the zooming process.
The invention provides an optical imaging system and a design method, wherein a liquid crystal lens and an optical system are combined to design, the liquid crystal lens is placed at a proper position in the optical system, and the diameter of an entrance pupil of the system is increased through the amplification effect of a front group of lenses, so that the luminous flux of the system is increased; preferably, the liquid crystal lens is placed at the position of the system diaphragm, so that the characteristic of unchanged magnification in the focusing process is realized, and the pupil aberration of the optical system is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an optical imaging system according to an embodiment of the present invention;
FIG. 2 is an RMS Spot diagram of the optical imaging system according to one embodiment of the invention;
FIG. 3 is a diffraction MTF graph of the optical imaging system according to one embodiment of the present invention;
fig. 4 is a flowchart of a method for designing an optical imaging system according to a second embodiment of the present invention;
fig. 5 shows the power P of the front group lens corresponding to the simulated entrance pupil magnification M ═ 1.8 and M ═ 2.5 in the second embodiment of the present invention1A graph relating to the change of the system focal power Δ P;
FIG. 6 is a diagram showing simulation results of using a front lens group, a liquid crystal lens group and a rear lens group as ideal lenses according to a second embodiment of the present invention;
FIG. 7 is a diagram of an optical path of an optical imaging system according to a second embodiment of the present invention;
FIG. 8 is a simulation result of an optical imaging system according to a second embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
Example one
An embodiment of the present invention provides an optical imaging system, including: the optical imaging system comprises a front group lens, a liquid crystal lens and a rear group lens, wherein the entrance pupil magnification M of the optical imaging system is as follows:
M＝1/(1-d1*P1)
wherein d is1Is the optical separation of the front group lens and the liquid crystal lens, P1The power of the front group lens.
The focal length Pall of the optical imaging system is as follows:
Pall＝PLC*(1-d1*P1)*(1–d2*P2)+Pg
the focal power variation quantity delta P of the optical imaging system is as follows:
ΔP＝Pall-Pg＝PLC*(1-d1*P1)*(1–d2*P2)
wherein, PLCIs the focal length of the liquid crystal lens, P1Is the focal length of the front group lens, P2Is the focal length of the rear group lens, PgFocal length of the combination of front and rear group lenses, d1Is the optical separation of the front lens group and the liquid crystal lens, d2The optical separation of the rear group lens and the liquid crystal lens.
In one embodiment, as shown in fig. 1, the liquid crystal lens 201 is located at a stop position of the optical imaging system, and an aperture of the liquid crystal lens 201 is the stop of the optical imaging system. The front group lens includes: first lens 101, second lens 102 and third lens 103, first lens 101 the second lens 102 with the object side of third lens 103 is the convex surface, first lens 101 the second lens 102 with the image side of third lens 103 is the concave surface, back group lens includes fourth lens 104 and fifth lens 105, fourth lens 104 object side is the concave surface, fourth passes through 104 mirror image side to be the convex surface, fifth lens 105 object side is the convex surface, fifth lens 105 image side is the concave surface. The optical imaging system further includes an optical filter 301 and an image sensor 401 on the rear group lens side. The focal length of the optical system is 16mm, the F/no is 3.2, and the half-field-angle HFOV is 12.5 degrees.
In fig. 1, a front group lens including 101, 102, and 103 and a rear group lens including 104 and 105 are combined to form a main lens, so as to realize the convergence of light rays, and image an object at a certain distance on an image sensor 401; under the drive of different voltages, the focal power of the liquid crystal lens 201 changes, and a certain converging or diverging effect is generated on light, so that the zooming or focusing function without mechanical movement can be realized; the optical filter 301 selectively passes or filters wavelengths with different wavelengths as required, so that the interference of light rays with unnecessary wave bands on imaging is reduced; the image sensor 401 converts the optical images formed by 101 to 105, 201 and 301 into electronic signals, stores the electronic signals into an optical imaging system through a digital operation circuit, and finally forms images on a display device or a film.
The radius of an object plane of the optical imaging system is 12-13, the distance between object planes is 3-3.5, or the radius of the object plane of the optical imaging system is 95-100, and the distance between object planes is 2.5-3, or the radius of the object plane of the optical imaging system is 5.0-5.5, and the distance between object planes is 2.0-2.3, or the radius of the object plane of the optical imaging system is 35.0-35.5, and the distance between object planes is 0.09-0.12, or the radius of the object plane of the optical imaging system is 55-57, and the distance between object planes is 1.7-1.9, or the radius of the object plane of the optical imaging system is 2.5-2.6, and the distance between object planes is 1.0-1.1. The radius of an object plane of the optical imaging system is-10.0 to-10.5, the distance between object planes is 2.5 to 3.0, or the radius of the object plane of the optical imaging system is-4.0 to-4.5, and the distance between object planes is 0.09 to 0.11, or the radius of the object plane of the optical imaging system is 6.3 to 6.5, and the distance between object planes is 1.4 to 1.6, or the radius of the object plane of the optical imaging system is 13.4 to 13.6, and the distance between object planes is 0.9 to 1.1. The object plane radius of the optical imaging system is infinite, the object plane interval is 0.01, or the object plane radius of the optical imaging system is infinite, the object plane interval is 1, or the object plane radius of the optical imaging system is infinite, the object plane interval is 2.4, or the object plane radius of the optical imaging system is infinite, the object plane interval is 0.4, or the object plane radius of the optical imaging system is infinite, and the object plane interval is 3.23. The radius of the image surface of the optical imaging system is infinite.
In one embodiment, the structural parameters of the optical imaging system are shown in table 1.
TABLE 1 optical imaging System construction parameters
| Number of noodles | Surface type | Radius of | Distance between each other | Material | |
| Article surface | STANDARD | Infinity | 10000 | ||
| 1 | STANDARD | 12.41593 | 3 | H- |
|
| 2 | STANDARD | 98.65805 | 2.740752 | ||
| 3 | STANDARD | 5.026678 | 2.134915 | H-ZK9B | |
| 4 | STANDARD | 35.27155 | 0.1 | ||
| 5 | STANDARD | 56.23689 | 1.876889 | ZF6 | |
| 6 | STANDARD | 2.555359 | 1.04488 | ||
| Diaphragm | STANDARD | Infinity | 0.01 | ||
| 8 | | Infinity | 1 | BK7 | |
| 9 | STANDARD | Infinity | 2.399326 | ||
| 10 | STANDARD | -10.37997 | 2.662358 | H-K9L | |
| 11 | STANDARD | -4.314552 | 0.1 | ||
| 12 | STANDARD | 6.423635 | 1.521702 | H-ZK9B | |
| 13 | STANDARD | 13.55479 | 1 | ||
| 14 | STANDARD | Infinity | 0.4 | BK7 | |
| 15 | STANDARD | Infinity | 3.232659 | ||
| Image plane | STANDARD | Infinity |
Fig. 2 and 3 are respectively an RMS Spot graph and a diffraction MTF graph of the optical imaging system.
Example two
An embodiment of the present invention provides a design method of an optical imaging system, where the optical imaging system includes a front group lens, a liquid crystal lens, and a rear group lens, as shown in fig. 4, the method includes:
s401, placing the liquid crystal lens at a diaphragm of the optical imaging system, wherein the aperture of the diaphragm is the clear aperture of the liquid crystal lens;
s402, enabling the liquid crystal lens to be equivalent to an ideal lens and plate glass with a preset thickness, and calculating the entrance pupil magnification and focal power of the optical imaging system;
wherein, the calculation process of the entrance pupil magnification and the focal power variation of the optical imaging system comprises the following steps:
the focal powers of the front lens group, the liquid crystal lens group and the rear lens group are respectively P1，PLCAnd P2(ii) a The optical interval between the front lens group, the rear lens group and the diaphragm is d1And d2(ii) a The clear aperture of the liquid crystal lens is A;
calculated according to the gaussian formula of the optical system:
the entrance pupil position s' is:
s'＝1/(1/d1-P1)
the entrance pupil diameter D is:
D＝s'*A/d1
the entrance pupil magnification M is
M＝D/A＝s'/d1＝1/(1-d1*P1)
From the above formula, the power P of the front group is known1And the optical distance d between the front lens group and the liquid crystal lens1The entrance pupil magnification M of the system can be calculated.
The liquid crystal lens optical system focal power calculating process comprises the following steps:
calculating according to a paraxial ray tracing equation:
focal length P of combination of front group lens and rear group lensgIs composed of
Pg＝P1+P2-(d1+d2)*P1*P2
The focal length Pall of the whole optical imaging system is
Pall＝(P1+PLC-d1*P1*PLC)*(1-d2*P2)+P2-d1*P1*P2
＝PLC*(1-d1*P1–d2*P2+d1*d2*P1*P2)+Pg
＝PLC*(1-d1*P1)*(1–d2*P2)+Pg
Amount of change of focal power Δ P
ΔP＝Pall-Pg＝PLC*(1-d1*P1)*(1–d2*P2)
S403, simulating front group focal power P1 and system focal power change delta P change relation data corresponding to different entrance pupil magnifications according to design requirements;
for example, a set of design requirements is calculated: d2＝5mm fg＝16mm PLC＝5m-1. Fig. 5 shows the front group lens power P corresponding to the simulated exit pupil magnification M-1.8 and M-2.5 according to the design requirements1And the change in system power Δ P.
S404, selecting at least one group of front group of focal power P1And optimizing the optical imaging system according to the data of the change relation of the system focal power change delta P.
Specifically, the method comprises the following steps:
s4041, simulating the front group lens, the liquid crystal lens, and the rear group lens as ideal lenses according to the focal power and the optical interval in the variation relation data, where a simulation diagram is shown in fig. 6.
S4042, fixing the front group of lenses, and materializing the rear group of lenses, wherein the rear group of lenses select 2 optical elements, the focal length and the light height of the optical elements are limited, and aberration optimization is performed;
s4043, fixing a rear group lens materialization system, and materializing a front group lens, wherein the front group lens selects 3 optical elements, the focal length and the light height of the optical elements are limited, and aberration optimization is performed;
s4044, optimizing the optical imaging system to enable the system to achieve preset performance under the condition that the optical imaging system meets optical structure parameters.
In a specific embodiment, the preset performance is that the lateral magnification of the liquid crystal lens is not changed during zooming, and optimizing the optical imaging system so that the system achieves the preset performance under the condition that optical structure parameters are met includes:
the method comprises the following steps: according to the demonstration of optical theory, the transverse magnification of the liquid crystal lens in the optical imaging system is determined to be unchanged in the zooming process;
specifically, an optical path diagram of the optical imaging system is shown in fig. 7, a main lens formed by a front group lens and a rear group lens is a fixed focus lens with good aberration correction, a liquid crystal lens can change focal power under the control of an external voltage, and an image is finally imaged on an image sensor after light passes through the main lens and the liquid crystal lens. The focal power is changed through the electric control liquid crystal lens, and the optical focusing method without mechanical movement can be realized. The invention is also suitable for optical systems such as liquid lenses and the like which change the focal power without mechanical movement.
In this embodiment, the aperture of the liquid crystal lens is a diaphragm of the whole optical imaging system, and according to the definition of geometric optics, the light passing through the center of the diaphragm is called a chief ray. The chief ray represents the energy center of a beam of rays, and the position of the chief ray on the image surface represents the position of the energy center of the object point projected on the image surface, namely the mapping central point (image point) of the object point on the image surface.
As shown in fig. 7, the power of the liquid crystal lens changes under an applied voltage, and the deflection angle of the peripheral light rays on the liquid crystal lens changes (the double-arrow line in fig. 7 shows the peripheral light rays). The chief ray passes through the center of the liquid crystal lens (which is also a diaphragm), and the ray passing through the center of the lens does not deviate according to the geometrical optics principle. Therefore, in the process of changing the focal power of the electrically controlled liquid crystal lens, the deflection degree of the chief ray is not changed (i.e. the central position of the image point is not changed), and the peripheral rays can be diverged or converged according to the focal power (i.e. the blurring degree of the image point is changed).
As can be seen from fig. 7, the magnification M is h'/h during zooming, and the magnification is not changed.
And secondly, simulating and simulating the liquid crystal lens through optical software to ensure that the transverse magnification is unchanged in the zooming process.
Specifically, a liquid crystal lens is set as a diaphragm of the optical imaging system, and in the process of changing the focal power of the liquid crystal lens, other parameters of the optical imaging system (such as an image plane position, main lens parameters and the like) are kept unchanged, and the height of a chief ray on an image plane under a certain field of view is measured.
Fig. 8 is a simulation result of optical software, and it can be seen from fig. 8 that, during the process of changing the focal power of the liquid crystal lens, the height of the chief ray at the same object point on the image plane is not changed (corresponding image height is not changed), i.e. the magnification is not changed (image height/object height).
The invention provides an optical imaging system and a design method, wherein a liquid crystal lens and an optical system are combined to design, the liquid crystal lens is placed at a proper position in the optical system, and the diameter of an entrance pupil of the system is increased through the amplification effect of a front group of lenses, so that the luminous flux of the system is increased; preferably, the liquid crystal lens is placed at the position of the system diaphragm, so that the characteristic of unchanged magnification in the focusing process is realized, and the pupil aberration of the optical system is reduced.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An optical imaging system, comprising: the optical imaging system comprises a front group lens, a liquid crystal lens and a rear group lens, wherein the entrance pupil magnification M of the optical imaging system is as follows:
M=1/(1-d1* P1)
wherein d is1Is the optical separation of the front group lens and the liquid crystal lens, P1The focal power of the front group lens;
the front group lens comprises a first lens, a second lens and a third lens, the object side surfaces of the first lens, the second lens and the third lens are convex surfaces, the image side surfaces of the first lens, the second lens and the third lens are concave surfaces, the rear group lens comprises a fourth lens and a fifth lens, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the optical imaging system further includes an optical filter and an image sensor located on the rear group lens side.
2. The optical imaging system of claim 1, wherein the liquid crystal lens is located at a stop position of the optical imaging system, and an aperture of the liquid crystal lens is the stop of the optical imaging system.
3. The optical imaging system of claim 2, wherein the optical imaging system has a focal length of 16mm, an F/no of 3.2, and a half field angle HFOV of 12.5 °.
4. The optical imaging system of any of claims 1-3, wherein the first lens has an object plane radius of 12.41593 and an object plane to image plane separation of 3, the second lens has an object plane radius of 5.026678 and an object plane to image plane separation of 2.134915, the third lens has an object plane radius of 56.23689 and an object plane to image plane separation of 1.876889.
5. The optical imaging system of any of claims 1-3, wherein the fourth lens has an object plane radius of-10.37997, an object plane to image plane separation distance of 2.662358, the fifth lens has an object plane radius of 6.423635, and an object plane to image plane separation distance of 1.521702.
6. A method of designing an optical imaging system comprising a front group lens, a liquid crystal lens, and a back group lens, the method comprising:
placing the liquid crystal lens at a diaphragm of the optical imaging system, wherein the aperture of the diaphragm is the clear aperture of the liquid crystal lens;
the liquid crystal lens is equivalent to an ideal lens and plate glass with a preset thickness, and the entrance pupil magnification and focal power of the optical imaging system are calculated;
according to design requirementsSimulating front group focal power P corresponding to different entrance pupil magnifications1And system focal power change delta P change relation data;
selecting at least one group of the front group of focal powers P1And optimizing the optical imaging system according to the data of the change relation of the system focal power change delta P.
7. The method as claimed in claim 6, wherein said selecting at least one of said front set of powers P1And optimizing the optical imaging system according to the system power change delta P change relation data comprises:
simulating by respectively taking the front group lens, the liquid crystal lens and the rear group lens as ideal lenses according to the focal power and the optical interval in the variation relation data;
fixing a front group lens, and materializing a rear group lens, wherein the rear group lens selects 2 optical elements, limits the focal length and the light height of the optical elements, and performs aberration optimization;
fixing a rear group lens materialization system, and materializing a front group lens, wherein the front group lens selects 3 optical elements, limits the focal length and the light height of the optical elements, and performs aberration optimization;
and optimizing the optical imaging system to ensure that the system achieves the preset performance under the condition of meeting the optical structure parameters.
8. The method for designing an optical imaging system according to claim 7, wherein the predetermined performance is a lateral magnification of the liquid crystal lens is not changed during zooming, and the optimizing the optical imaging system to achieve the predetermined performance under the condition that the optical structure parameter is satisfied comprises:
according to the demonstration of optical theory, the transverse magnification of the liquid crystal lens in the optical imaging system is determined to be unchanged in the zooming process;
and simulating the liquid crystal lens through optical software to ensure that the transverse magnification of the liquid crystal lens is unchanged in the zooming process.
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