CN114815174B - Optical lens for long-distance shooting - Google Patents
Optical lens for long-distance shooting Download PDFInfo
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- CN114815174B CN114815174B CN202210449085.6A CN202210449085A CN114815174B CN 114815174 B CN114815174 B CN 114815174B CN 202210449085 A CN202210449085 A CN 202210449085A CN 114815174 B CN114815174 B CN 114815174B
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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
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—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
-
- 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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides an optical lens for long-distance shooting, which sequentially comprises the following components from an object side to an image side: a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having positive optical power, and a fifth lens having negative optical power. The optical lens for long-distance shooting can be applied to long-distance shooting equipment such as a long-focus lens, a telescope and the like, has a large view field angle, and can effectively correct various aberrations, so that a good imaging quality can be ensured even a long shooting distance.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an optical lens for long-distance shooting.
Background
With the development of technology, the long-distance shooting device is gradually raised, the optical system photosensitive element of the long-distance shooting device is not limited to a photosensitive coupling element or a complementary metal oxide semiconductor element, and with the refinement of semiconductor processing technology, the pixel size of the photosensitive element is reduced, and the optical system tends to be higher in pixel and imaging quality. The optical lens in the prior art has the defects of poor imaging quality, small field of view and the like.
Disclosure of Invention
In order to solve the problems, the invention provides the optical lens for long-distance shooting, which can be applied to long-distance shooting equipment such as a long-focus lens, a telescope lens and the like, has a large view field angle, and can effectively correct various aberrations, so that a good imaging quality can be ensured even at a long shooting distance.
In order to achieve the above purpose, the present invention solves the problems by the following technical scheme:
an optical lens for long-distance photographing, comprising, in order from an object side to an image side:
a first lens with positive focal power, wherein the object side paraxial region of the first lens is a convex surface, and the image side paraxial region of the first lens is a concave surface;
a second lens with negative focal power, wherein the object side paraxial region of the second lens is a convex surface, and the image side paraxial region of the second lens is a concave surface;
a third lens element with positive refractive power, wherein the object-side paraxial region of the third lens element is convex, and the image-side paraxial region of the third lens element is convex;
a fourth lens element with positive refractive power, wherein the object-side paraxial region of the fourth lens element is concave, and the image-side paraxial region of the fourth lens element is convex;
and the object side paraxial region of the fifth lens is a concave surface, and the image side paraxial region of the fifth lens is a concave surface.
Specifically, an aperture is arranged on one side of the object side surface of the first lens.
Specifically, a protective glass is disposed on one side of the image side surface of the fifth lens.
Specifically, the optical lens satisfies the following conditions:
4.1mm<EFL<4.3mm；
wherein EFL is the effective focal length of the optical lens.
Specifically, the optical lens satisfies the following conditions:
1.8<Fno<1.9；
wherein FNo is the aperture value of the optical lens.
Specifically, the optical lens satisfies the following conditions:
40.7 degrees < HFOV <41.3 degrees;
wherein HFOV is the half field angle of the optical lens.
Specifically, the optical lens satisfies the following conditions:
20<V2＝V4<V5<V1＝V3<60；
wherein V1, V2, V3, V4, V5 are the abbe numbers of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, respectively.
The beneficial effects of the invention are as follows:
the optical lens can be applied to long-distance shooting equipment such as a long-focus lens, a telescope lens and the like, has a maximum half field angle of 41.22 degrees and a large field angle, and can effectively correct various aberrations, so that a good imaging quality can be ensured even a long shooting distance.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens of embodiment 1.
Fig. 2 is a curvature of field aberration diagram of the optical lens of embodiment 1.
Fig. 3 is a distortion aberration diagram of the optical lens of embodiment 1.
Fig. 4 is a longitudinal spherical aberration diagram of an optical lens of embodiment 1.
Fig. 5 is a schematic structural diagram of an optical lens of embodiment 2.
Fig. 6 is a curvature of field aberration diagram of the optical lens of embodiment 2.
Fig. 7 is a distortion aberration diagram of the optical lens of embodiment 2.
Fig. 8 is a longitudinal spherical aberration diagram of an optical lens of embodiment 2.
Fig. 9 is a schematic structural diagram of an optical lens of embodiment 3.
Fig. 10 is a curvature of field aberration diagram of the optical lens of embodiment 3.
Fig. 11 is a distortion aberration diagram of the optical lens of embodiment 3.
Fig. 12 is a longitudinal spherical aberration diagram of an optical lens of embodiment 3.
The reference numerals are: the optical lens assembly comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, an aperture 60, a cover glass 70 and an imaging surface 80.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
Fig. 1 is a schematic structural diagram of an optical lens according to embodiment 1 of the present invention. FIG. 2 is a Field curvature (Field) aberration diagram of an optical lens according to the present invention. Fig. 3 is a Distortion (aberration) aberration diagram of an optical lens according to the present invention. Fig. 4 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical lens of the present invention.
As shown in fig. 1, an optical lens for long-distance photographing of embodiment 1 includes, in order from an object side to an image side:
an aperture 60;
the first lens element 10 with positive refractive power, wherein the object-side paraxial region of the first lens element 10 is convex, and the image-side paraxial region of the first lens element 10 is concave;
the second lens element 20 with negative refractive power, wherein the object-side paraxial region of the second lens element 20 is convex, and the image-side paraxial region of the second lens element 20 is concave;
the third lens element 30 with positive refractive power, wherein the object-side paraxial region of the third lens element 30 is convex, and the image-side paraxial region of the third lens element 30 is convex;
a fourth lens element 40 with positive refractive power, wherein a paraxial region of an object-side surface of the fourth lens element 40 is concave, and a paraxial region of an image-side surface of the fourth lens element 40 is convex;
a fifth lens element 50 with negative refractive power, wherein the object-side paraxial region of the fifth lens element 50 is concave, and the image-side paraxial region of the fifth lens element 50 is concave;
a cover glass 70;
an imaging surface 80.
In the present embodiment, the first lens element 10 has an abbe number V1, v1=56.0, the second lens element 20 has an abbe number V2, v2=20.5, the third lens element 30 has an abbe number V3, v3=56.0, the fourth lens element 40 has an abbe number V4, v4=20.5, and the fifth lens element 50 has an abbe number V5, v5=23.6.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the optical lens of example 1 is EFL, the aperture value (F-number) is FNo, and half of the maximum angle of view is HFOV (Half Field of View), which is the following values: efl=4.241 mm, fno=1.848, hfov=40.79 degrees.
The focal length of the first lens 10 is f1, f1=4.71 mm, the focal length of the second lens 20 is f2, f2= -24.97mm, the focal length of the third lens 30 is f3, f3=8.16 mm, the focal length of the fourth lens 40 is f4, f4=2.41 mm, and the focal length of the fifth lens 50 is f5, f5= -1.62mm.
Please refer to table 1 below, which is detailed optical data of the optical lens of the embodiment 1 of the present invention. Wherein the object-side surface of the first lens element 10 is denoted by a surface L1a, the image-side surface thereof is denoted by a surface L1b, and so on; a lens surface denoted as ASP in the table, e.g. object-side surface L1a of the first lens 10, indicates that the surface is aspherical; the value of the distance field in the table represents the distance from the surface to the next surface, for example, the object-side surface to the image-side surface of the first lens 10 is 0.560mm, indicating that the thickness of the first lens 10 is 0.560mm. The others can be analogized and will not be repeated below.
Please refer to table 2, which shows the aspherical coefficients of each lens surface of example 1 of the present invention. Wherein K is a cone coefficient in the aspherical curve equation, and A2 to A16 represent aspherical coefficients of the 2 nd to 16 th orders of each surface. For example, the object-side surface of the first lens 10 has a conic coefficient K of 5.24E-01. The others can be analogized and will not be repeated below. In addition, the tables of the following embodiments correspond to the optical lenses of the embodiments, and the definition of each table is the same as that of embodiment 1, so that the description of the following embodiments is omitted.
TABLE 1
TABLE 2
Example 2
Fig. 5 is a schematic structural diagram of an optical lens according to embodiment 2 of the present invention. Fig. 6 is a Field curvature (Field) aberration diagram of an optical lens in embodiment 2 of the present invention. Fig. 7 is a Distortion (aberration) aberration diagram of an optical lens according to embodiment 2 of the present invention. Fig. 8 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of an optical lens according to embodiment 2 of the present invention.
As shown in fig. 5, an optical lens for long-distance photographing of embodiment 1 includes, in order from an object side to an image side:
an aperture 60;
the first lens element 10 with positive refractive power, wherein the object-side paraxial region of the first lens element 10 is convex, and the image-side paraxial region of the first lens element 10 is concave;
the second lens element 20 with negative refractive power, wherein the object-side paraxial region of the second lens element 20 is convex, and the image-side paraxial region of the second lens element 20 is concave;
the third lens element 30 with positive refractive power, wherein the object-side paraxial region of the third lens element 30 is convex, and the image-side paraxial region of the third lens element 30 is convex;
a fourth lens element 40 with positive refractive power, wherein a paraxial region of an object-side surface of the fourth lens element 40 is concave, and a paraxial region of an image-side surface of the fourth lens element 40 is convex;
a fifth lens element 50 with negative refractive power, wherein the object-side paraxial region of the fifth lens element 50 is concave, and the image-side paraxial region of the fifth lens element 50 is concave;
a cover glass 70;
an imaging surface 80.
In the present embodiment, the first lens element 10 has an abbe number V1, v1=56.0, the second lens element 20 has an abbe number V2, v2=20.5, the third lens element 30 has an abbe number V3, v3=56.0, the fourth lens element 40 has an abbe number V4, v4=20.5, and the fifth lens element 50 has an abbe number V5, v5=23.6.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the optical lens of example 2 was EFL, the aperture value (F-number) was FNo, and half of the maximum angle of view was HFOV (Half Field of View), which was the following values: efl=4.194 mm, fno=1.854, hfov=40.79 degrees.
The focal length of the first lens 10 is f1, f1=4.71 mm, the focal length of the second lens 20 is f2, f2= -24.73mm, the focal length of the third lens 30 is f3, f3=8.16 mm, the focal length of the fourth lens 40 is f4, f4=2.41 mm, and the focal length of the fifth lens 50 is f5, f5= -1.61mm.
Please refer to table 3 below, which is detailed optical data of the optical lens of the embodiment 2 of the present invention.
Please refer to the following table 4, which shows the aspherical coefficients of each lens surface of example 2 of the present invention.
TABLE 3 Table 3
TABLE 4 Table 4
Example 3
Fig. 9 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention. Fig. 10 is a Field curvature (Field) aberration diagram of an optical lens in embodiment 3 of the present invention. Fig. 11 is a Distortion (aberration) aberration diagram of an optical lens in embodiment 3 of the present invention. Fig. 12 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of an optical lens according to embodiment 3 of the present invention.
As shown in fig. 9, an optical lens for long-distance photographing of embodiment 3 includes, in order from an object side to an image side:
an aperture 60;
the first lens element 10 with positive refractive power, wherein the object-side paraxial region of the first lens element 10 is convex, and the image-side paraxial region of the first lens element 10 is concave;
the second lens element 20 with negative refractive power, wherein the object-side paraxial region of the second lens element 20 is convex, and the image-side paraxial region of the second lens element 20 is concave;
the third lens element 30 with positive refractive power, wherein the object-side paraxial region of the third lens element 30 is convex, and the image-side paraxial region of the third lens element 30 is convex;
a fourth lens element 40 with positive refractive power, wherein a paraxial region of an object-side surface of the fourth lens element 40 is concave, and a paraxial region of an image-side surface of the fourth lens element 40 is convex;
a fifth lens element 50 with negative refractive power, wherein the object-side paraxial region of the fifth lens element 50 is concave, and the image-side paraxial region of the fifth lens element 50 is concave;
a cover glass 70;
an imaging surface 80.
In the present embodiment, the first lens element 10 has an abbe number V1, v1=56.0, the second lens element 20 has an abbe number V2, v2=20.5, the third lens element 30 has an abbe number V3, v3=56.0, the fourth lens element 40 has an abbe number V4, v4=20.5, and the fifth lens element 50 has an abbe number V5, v5=23.6.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the optical lens of example 3 was EFL, the aperture value (F-number) was FNo, and half of the maximum angle of view was HFOV (Half Field of View), which was the following values: efl=4.154 mm, fno=1.891, hfov= 41.22 degrees.
The focal length of the first lens 10 is f1, f1=4.71 mm, the focal length of the second lens 20 is f2, f2= -24.61mm, the focal length of the third lens 30 is f3, f3=8.16 mm, the focal length of the fourth lens 40 is f4, f4=2.42 mm, and the focal length of the fifth lens 50 is f5, f5= -1.61mm.
Please refer to the following table 5, which shows detailed optical data of the optical lens in example 3 of the present invention.
See table 6 below, which is the aspherical coefficients of each lens surface of example 3 of the present invention.
TABLE 5
TABLE 6
The above examples represent only 3 embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. An optical lens for long-distance shooting, characterized in that an effective focal length EFL of 4.1mm <4.3mm, an aperture value Fno of 1.8< 1.9, and a half field view HFOV of 40.7 <41.3 degrees, in order from an object side to an image side, are composed of:
a first lens (10) having positive optical power, the object-side paraxial region of the first lens (10) being convex, the image-side paraxial region of the first lens (10) being concave;
a second lens (20) having negative optical power, the object-side paraxial region of the second lens (20) being convex, the image-side paraxial region of the second lens (20) being concave;
a third lens (30) having positive optical power, the object-side paraxial region of the third lens (30) being convex, the image-side paraxial region of the third lens (30) being convex;
a fourth lens (40) having positive optical power, the object-side paraxial region of the fourth lens (40) being concave, and the image-side paraxial region of the fourth lens (40) being convex;
and a fifth lens (50) having negative optical power, wherein the object-side paraxial region of the fifth lens (50) is concave, and the image-side paraxial region of the fifth lens (50) is concave.
2. The optical lens for long-distance photographing according to claim 1, wherein an aperture (60) is provided on an object side surface side of the first lens (10).
3. The optical lens for long-distance photographing according to claim 1, wherein the fifth lens (50) is provided with a cover glass (70) on the image side surface side.
4. The optical lens for long-distance shooting according to claim 1, wherein the optical lens satisfies the following conditions:
20<V2＝V4<V5<V1＝V3<60；
wherein V1, V2, V3, V4, V5 are the dispersion coefficients of the first lens (10), the second lens (20), the third lens (30), the fourth lens (40), and the fifth lens (50), respectively.
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| CN202210449085.6A CN114815174B (en) | 2022-04-26 | 2022-04-26 | Optical lens for long-distance shooting |
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