CN111929848A - Wide-angle imaging optical system - Google Patents
Wide-angle imaging optical system Download PDFInfo
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- CN111929848A CN111929848A CN202011012020.2A CN202011012020A CN111929848A CN 111929848 A CN111929848 A CN 111929848A CN 202011012020 A CN202011012020 A CN 202011012020A CN 111929848 A CN111929848 A CN 111929848A
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- 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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- 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
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
A wide-angle imaging optical system is composed of a front lens group with negative focal power and a rear lens group with positive focal power which are sequentially arranged from an object side to an image side; wherein the front lens group is composed of a negative first lens, a positive second lens, a negative third lens and a positive fourth lens; the rear lens group consists of a positive fifth lens, a positive sixth lens, a positive seventh lens and a positive eighth lens, and the diaphragm is positioned between the front lens group and the rear lens group. The third lens and the fourth lens constitute a cemented lens, and the seventh lens and the eighth lens constitute a cemented lens. The angle of view of the imaging system satisfying the conditional expression of the present application is not less than 132 °.
Description
Technical Field
The invention relates to an imaging optical system, in particular to a wide-angle imaging optical system for an unmanned aerial vehicle.
Background
The existing lens for the unmanned aerial vehicle has a poor field angle, for example, the field angle of the lens for the unmanned aerial vehicle disclosed in CN207636836U is greater than 55 °, and the field angle of the camera lens for the unmanned aerial vehicle disclosed in CN206378631U reaches 94 °, however, in actual shooting, especially during surveying and mapping of the unmanned aerial vehicle, the ground surface area to be shot is wide and the above-mentioned field angle cannot meet the requirement, the flight times of the unmanned aerial vehicle can be reduced at a larger field angle, and the splicing times can also be reduced in the later image splicing process, so that the field angle of the optical system needs to be further increased, and the edge aberration is reduced on the basis of a large field angle.
Disclosure of Invention
In view of the above-described problems, it is desirable to provide a wide-angle imaging optical system for an unmanned aerial vehicle, which corrects peripheral aberration while obtaining a large angle of view in order to solve the above-described problems.
A wide-angle imaging optical system according to the present disclosure, which is composed of a front lens group having negative power and a rear lens group having positive power, which are sequentially arranged from an object side to an image side; the front lens group consists of a first lens, a second lens, a third lens and a fourth lens; the rear lens group consists of a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the diaphragm is positioned between the front lens group and the rear lens group. The third lens and the fourth lens constitute a cemented lens, and the seventh lens and the eighth lens constitute a cemented lens. And the imaging optical system further includes an optical filter. Further, the imaging optical system may further include an image sensor. Wherein:
the first lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the third lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the seventh lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the eighth lens element is a positive lens element, the object-side surface of which is concave and the image-side surface of which is convex.
According to the imaging optical system of the present disclosure, the following conditional expression (1) can be satisfied:
-2<f1/f<-1.5
6<f2/f<7
-5<f3/f<-4.5
2<f4/f<3
0.4<|f34/fG1|<0.5
-12<fG1/f<-11 (1)
the conditional expression (1) defines the relation of each focal length of the front lens group, ensures that the system has a large field angle, and can be seen from the attached drawing 1 that marginal rays almost only get close to the optical axis to be paraxial rays in the process of propagating in the front lens group, so the front lens group mainly plays a role in obtaining a large field of view. According to the imaging optical system of the present disclosure, the following conditional expression (2) can be satisfied:
2.5<f5/f<3
4<f6/f<4.5
3.5<f7/f<4
180<f8/f<190
2.5<|f78/fG2|<3
1<fG2/f<2 (2)
the conditional expression (2) configures the focal length of the rear lens group, the front lens group refracts the light with a large field angle to be in the paraxial direction, the deflection of the light with a large field angle is completed, the rear lens group mainly plays a role in ensuring that the light with a large field angle of the front lens group is imaged smoothly and aberration is corrected, the conditional expression does not satisfy the formula, and the aberration is not easy to correct.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (3):
0.04<fB/TTL<0.07
7<|fG1/fG2|<8
0.1<f/TTL<0.2 (3)
when the conditional expression (3) is satisfied, the focal lengths of the front lens group and the lens group can be mutually influenced, the integral focal length of the system and the back focal length of the system are both very small, the integral distance between all the lenses is relatively small when the focal length of the system is small, the distance between an imaging surface and the image side surface of the last lens is small when the back focal length is small, and the system can be guaranteed to have a relatively small size.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (4):
3<r1/r2<4
2<d2/d3<4 (4)
when the conditional expression (4) is satisfied, the maximum refraction of the marginal rays occurs at the first lens, so that large refraction occurs before the marginal rays enter the second lens, a large field of view is obtained, and the refraction pressure of the subsequent lenses is relieved.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (5):
2.5<(d5-d6)/(d13-d14)<3.5
v3-v4>50
v8-v7>55 (5)
wherein, v3, v4, v7 and v8 are abbe numbers of the third lens, the fourth lens, the seventh lens and the eighth lens respectively, and the chromatic aberration of the system can be well corrected by satisfying the conditional expressions.
Moreover, the front lens group and the rear lens group respectively comprise a cemented lens, so that on one hand, the total length of the system can be reduced, and chromatic aberration can be conveniently corrected. The assignment of the focal lengths of the two groups of cemented lenses satisfies the conditional expressions (1) to (3) is advantageous for aberration correction.
In addition, the present embodiment adopts six aspheric surfaces to correct aberrations, namely, the image side surface of the first lens element, the object side surface of the second lens element, the object side surface and the image side surface of the fifth lens element, the object side surface of the seventh lens element and the image side surface of the eighth lens element.
By adopting the wide-angle imaging optical system, the field angle can reach 132 degrees, and the field angle is greatly improved.
Drawings
Embodiments of the present disclosure will be more clearly understood from the following description taken in conjunction with the accompanying drawings:
fig. 1 is a structural diagram of a wide-angle imaging optical system according to a first exemplary embodiment of the present disclosure;
FIG. 2 is a field-of-view data diagram for the wide-angle imaging optical system of FIG. 1;
where, L1 to L8 denote first to seventh lenses, STO denotes a stop, G1 denotes a front lens group, G2 denotes a rear lens group, S1 to S17 denote surface numbers, IMG denotes an image plane, a denotes a central field, and B denotes a peripheral field.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to fig. 1 to 2.
Fig. 1 is a block diagram of a wide-angle imaging optical system for a drone according to the present disclosure. In the present specification, the unit of the numerical value of the radius of curvature, the numerical value of the thickness, and the numerical value of the thickness of the lens may be mm.
A wide-angle imaging optical system according to the present disclosure, which is composed of a front lens group G1 whose power is negative and a rear lens group G2 whose power is positive, which are arranged in order from an object side to an image side; wherein the front lens group G1 is composed of a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4; the rear lens group G2 is composed of a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, and a stop is located between the front lens group G1 and the rear lens group G2. The third lens L3 and the fourth lens L4 constitute a cemented lens, and the seventh lens L7 and the eighth lens L8 constitute a cemented lens. And the imaging optical system further includes an optical filter. Further, the imaging optical system may further include an image sensor.
Wherein:
the first lens element L1 is a negative lens element, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a positive lens element, the object-side surface S3 is convex, and the image-side surface S4 is convex;
the third lens element L3 is a negative lens element, the object-side surface S5 is convex, and the image-side surface S6 is concave;
the fourth lens element L4 is a positive lens element, the object-side surface S6 is convex, and the image-side surface S7 is concave;
the fifth lens element L5 is a positive lens element, the object-side surface S9 is convex, and the image-side surface S10 is convex;
the sixth lens element L6 is a positive lens element, the object-side surface S12 is convex, and the image-side surface S13 is convex;
the seventh lens element L7 is a positive lens element, the object-side surface S14 is convex, and the image-side surface S15 is convex;
the eighth lens element L8 is a positive lens element, and has a concave object-side surface S14 and a convex image-side surface S15.
The object-side surface and the image-side surface are convex or concave, and the portions of the object-side surface and the image-side surface of the lens close to the optical axis are convex or concave according to the conventional understanding in the art.
According to the imaging optical system of the present disclosure, the following conditional expression (1) can be satisfied:
-2<f1/f<-1.5
6<f2/f<7
-5<f3/f<-4.5
2<f4/f<3
0.4<|f34/fG1|<0.5
-12<fG1/f<-11 (1)
the conditional expression (1) defines the relation of each focal length of the front lens group, ensures that the system has a large field angle, and can be seen from the attached drawing 1 that marginal rays almost only get close to the optical axis to be paraxial rays in the process of propagating in the front lens group, so the front lens group mainly plays a role in obtaining a large field of view.
According to the imaging optical system of the present disclosure, the following conditional expression (2) can be satisfied:
2.5<f5/f<3
4<f6/f<4.5
3.5<f7/f<4
180<f8/f<190
2.5<|f78/fG2|<3
1<fG2/f<2 (2)
the conditional expression (2) configures the focal length of the rear lens group, the front lens group refracts the light with a large field angle to be in the paraxial direction, the deflection of the light with a large field angle is completed, the rear lens group mainly plays a role in ensuring that the light with a large field angle of the front lens group is imaged smoothly and aberration is corrected, the conditional expression does not satisfy the formula, and the aberration is not easy to correct.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (3):
0.04<fB/TTL<0.07
7<|fG1/fG2|<8
0.1<f/TTL<0.2 (3)
when the conditional expression (3) is satisfied, the focal lengths of the front lens group and the lens group can be mutually influenced, the integral focal length of the system and the back focal length of the system are both very small, the integral distance between all the lenses is relatively small when the focal length of the system is small, the distance between an imaging surface and the image side surface of the last lens is small when the back focal length is small, and the system can be guaranteed to have a relatively small size.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (4):
3<r1/r2<4
2<d2/d3<4 (4)
when the conditional expression (4) is satisfied, the maximum refraction of the marginal rays occurs at the first lens, so that large refraction occurs before the marginal rays enter the second lens, a large field of view is obtained, and the refraction pressure of the subsequent lenses is relieved.
The imaging optical system according to the present disclosure may satisfy the following conditional expression (5):
2.5<(d5-d6)/(d13-d14)<3.5
v3-v4>50
v8-v7>55 (5)
wherein, v3, v4, v7 and v8 are abbe numbers of the third lens, the fourth lens, the seventh lens and the eighth lens respectively, and the chromatic aberration of the system can be well corrected by satisfying the conditional expressions.
Moreover, the front lens group and the rear lens group respectively comprise a cemented lens, so that on one hand, the total length of the system can be reduced, and chromatic aberration can be conveniently corrected. The assignment of the focal lengths of the two groups of cemented lenses satisfies the conditional expressions (1) to (3) is advantageous for aberration correction.
In addition, the present embodiment adopts six aspheric surfaces to correct aberrations, namely, the image side surface of the first lens element, the object side surface of the second lens element, the object side surface and the image side surface of the fifth lens element, the object side surface of the seventh lens element and the image side surface of the eighth lens element.
As can be seen from the view data diagram of fig. 2, the half field angle at the marginal ray B is 66 °, so the field angle of the system can reach 132 °.
Table 1 shows parameters of the imaging optical system (surface number, radius of curvature, thickness of lens, distance between lenses, refractive index of lens, abbe number of lens, where length units are all mm, and F # is 1.5).
[ Table 1]
Table 2 shows aspheric coefficients adopted by the imaging optical system, and the function expression of the aspheric surface is:
the aspherical coefficients are as follows: [ Table 2]
Table 3 shows optical parameters of the imaging optical system of the present embodiment.
[ Table 3]
f 1-f 8 are focal lengths of the lenses, fG1 is a focal length of the front lens group G1, fG2 is a focal length of the rear lens group G2, f is a focal length of the whole imaging optical system, and f is a focal length of the whole imaging optical systemBFor the system back focal length, f34 is the combined focal length of the third lens element and the fourth lens element, f78 is the combined focal length of the seventh lens element and the eighth lens element, r1 and r2 are the radii of curvature of the object-side surface and the image-side surface of the first lens element, d3 is the thickness of the second lens element on the optical axis, d2 is the distance between the image-side surface of the first lens element and the object-side surface of the second lens element on the optical axis, d5 is the thickness of the third lens element on the optical axis, d6 is the thickness of the fourth lens element on the optical axis, d13 is the thickness of the seventh lens element on the optical axis, d14 is the thickness of the eighth lens element on the optical axis, and TTL is the total length of.
While the above exemplary embodiments have been shown and described, it will be apparent to those skilled in the art that modifications and variations can be made thereto without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (8)
1. A wide-angle imaging optical system is composed of a front lens group with negative focal power and a rear lens group with positive focal power which are sequentially arranged from an object side to an image side; the front lens group consists of a first lens, a second lens, a third lens and a fourth lens; the rear lens group consists of a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the diaphragm is positioned between the front lens group and the rear lens group. The method is characterized in that:
the third lens and the fourth lens constitute a cemented lens, and the seventh lens and the eighth lens constitute a cemented lens. Wherein:
the first lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the third lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the seventh lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the eighth lens element is a positive lens element, the object-side surface of which is concave and the image-side surface of which is convex.
2. The wide-angle imaging optical system according to claim 1, characterized in that: further satisfying the following conditional formula (1):
-2<f1/f<-1.5
6<f2/f<7
-5<f3/f<-4.5
2<f4/f<3
0.4<|f34/fG1|<0.5
-12<fG1/f<-11 (1)。
3. the wide-angle imaging optical system according to claim 1, characterized in that: further satisfying the following conditional formula (2):
2.5<f5/f<3
4<f6/f<4.5
3.5<f7/f<4
180<f8/f<190
2.5<|f78/fG2|<3
1<fG2/f<2 (2)。
4. the wide-angle imaging optical system according to claim 1, characterized in that: further satisfying the following conditional formula (3):
0.04<fB/TTL<0.07
7<|fG1/fG2|<8
0.1<f/TTL<0.2 (3)。
5. the wide-angle imaging optical system according to claim 1, characterized in that: further satisfying the following conditional formula (4):
3<r1/r2<4
2<d2/d3<4 (4)。
6. the wide-angle imaging optical system according to claim 1, characterized in that: further satisfying the following conditional formula (5):
2.5<(d5-d6)/(d13-d14)<3.5
v3-v4>50
v8-v7>55 (5)。
7. the wide-angle imaging optical system according to any one of claims 1 to 6, characterized in that: the image side surface of the first lens, the object side surface of the second lens, the object side surface and the image side surface of the fifth lens, the object side surface of the seventh lens and the image side surface of the eighth lens are aspheric surfaces.
8. The wide-angle imaging optical system according to any one of claims 1 to 6, characterized in that: the angle of view is not less than 132 deg.
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| WO2022133651A1 (en) * | 2020-12-21 | 2022-06-30 | 欧菲光集团股份有限公司 | Optical system, photographing module, and electronic device |
| CN115047605A (en) * | 2022-07-05 | 2022-09-13 | 陈明君 | Imaging lens |
| TWI797968B (en) * | 2022-01-21 | 2023-04-01 | 上暘光學股份有限公司 | optical lens |
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| US20180239117A1 (en) * | 2017-02-17 | 2018-08-23 | Samsung Electronics Co., Ltd. | Optical lens assembly and electronic apparatus including the same |
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| WO2022133651A1 (en) * | 2020-12-21 | 2022-06-30 | 欧菲光集团股份有限公司 | Optical system, photographing module, and electronic device |
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