CN112748519A - Large wide-angle optical lens - Google Patents

Abstract

The invention discloses a large wide-angle optical lens, which comprises a lens barrel, a lens combination, a first diaphragm and a second diaphragm, wherein the lens combination is positioned in the lens barrel and consists of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the incident direction of light; and the other side of the first diaphragm is abutted against the first lens, and the other side of the second diaphragm is abutted against the third lens. The large wide-angle optical lens obtained by the invention has the advantages of large wide angle, low distortion, small lens volume, basically no deformation of an imaging picture, high imaging picture quality and accurate imaging picture color. The optical lens of the patent does not change from a low temperature of-30 degrees to a high temperature of 85 degrees, and finally, a high-performance and large wide-angle optical lens is obtained, so that the market demand can be met.

Description

Large wide-angle optical lens

Technical Field

The invention relates to a large wide-angle optical lens.

Background

In recent years, optical lenses are increasingly used in automobiles, and the requirements for pixels of the optical lenses are increasingly high. According to the market research condition, the glass-plastic hybrid lens on the market at present has the defect that the standard-reaching security of high and low temperatures requires a large wide-angle lens, so that the glass-plastic hybrid lens needs to be researched and developed as soon as possible.

Disclosure of Invention

The present invention is directed to provide a large wide-angle optical lens with high and low temperature resistance to overcome the above-mentioned disadvantages of the prior art.

In order to achieve the above object, the present invention provides a large wide-angle optical lens, including a lens barrel, a lens assembly, a first aperture and a second aperture, the lens assembly, the first aperture and the second aperture being located in the lens barrel, the lens assembly being composed of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along a light incidence direction; a first diaphragm and a second diaphragm are respectively arranged on two sides of the second lens, the other side of the first diaphragm is abutted against the first lens, and the other side of the second diaphragm is abutted against the third lens;

the first lens is provided with a concave object-side surface and a concave image-side surface, and both the object-side surface and the image-side surface are aspheric surfaces;

the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, and the object side surface and the image side surface of the second lens are spherical surfaces;

the third lens element has a convex object-side surface and a convex image-side surface, and both the object-side surface and the image-side surface are aspheric surfaces;

the fourth lens element has a concave object-side surface and a convex image-side surface, and both the object-side surface and the image-side surface are aspheric surfaces.

The second lens is made of glass, and the first lens, the third lens and the fourth lens are made of plastic.

The focus f of big wide angle optical lens is 3.569mm, wherein the focus f1 of first lens is-4.577 mm, the focus f2 of second lens is 8.184mm, the focus f3 of third lens is 19.213mm, the focus f4 of fourth lens is 64.601 mm.

The rise of one point on the aspheric surfaces of the first lens, the third lens and the fourth lens along the optical axis direction is z, and the following requirements are met:

wherein c is the curvature corresponding to the aspheric radius, a1, a2, a3, a4, a5, a6, a7, a8 and a9 are all aspheric coefficients, r is the distance from a point on the aspheric surface of the lens to the optical axis, and k is the conic constant of the lens surface.

The large wide-angle optical lens obtained by the invention has the advantages of large wide angle, low distortion, small lens volume, basically no deformation of an imaging picture, high imaging picture quality and accurate imaging picture color. The optical lens of the patent does not change from a low temperature of-30 degrees to a high temperature of 85 degrees, and finally, a high-performance and large wide-angle optical lens is obtained, so that the market demand can be met.

Drawings

Fig. 1 is a schematic structural view of a large wide-angle optical lens of embodiment 1;

FIG. 2 is an optical path diagram of a large wide-angle optical lens;

FIG. 3 is a stippled diagram of a large wide-angle optical lens;

FIG. 4 is a graph of MTF for a large wide-angle optical lens;

FIG. 5 is a graph of the MTF of the composite diffraction of a large wide-angle optical lens;

FIG. 6 is a field curvature distortion diagram of a large wide-angle optical lens;

fig. 7 is a relative illuminance diagram of a large wide-angle optical lens.

In the figure: the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a first space ring 5, a second space ring 6 and a lens cone 7.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example 1:

as shown in fig. 1-2, the large wide-angle optical lens provided in this embodiment includes a lens barrel 7, a lens assembly located in the lens barrel 7, and a first aperture 5 and a second aperture 6, where the lens assembly is composed of a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4, which are sequentially arranged along a light incident direction; a first diaphragm 5 and a second diaphragm 6 are respectively arranged on two sides of the second lens 2, the other side of the first diaphragm 5 is abutted against the first lens 1, and the other side of the second diaphragm 6 is abutted against the third lens 3;

the first lens element 1 has a concave object-side surface and a concave image-side surface, and both the object-side surface and the image-side surface are aspheric surfaces;

the object side surface and the image side surface of the second lens element 2 are convex surfaces, and both the object side surface and the image side surface are spherical surfaces;

the third lens element 3 has a convex object-side surface and a convex image-side surface, and both the object-side surface and the image-side surface are aspheric;

the fourth lens element 4 has a concave object-side surface and a convex image-side surface, and both the object-side surface and the image-side surface are aspheric.

The second lens 2 is made of glass, and the first lens 1, the third lens 3 and the fourth lens 4 are made of plastic.

The focal length f of big wide angle optical lens is 3.569mm, wherein the focal length f1 of first lens 1 is-4.577 mm, the focal length f2 of second lens 2 is 8.184mm, the focal length f3 of third lens 3 is 19.213mm, the focal length f4 of fourth lens 4 is 64.601 mm.

Fig. 3-7 are a dot-column diagram, an MTF graph, a composite diffraction MTF graph, a field curvature distortion graph, and a relative illumination graph of the large wide-angle optical lens, respectively.

The parameters of the large wide-angle optical lens are shown in table 1 below:

TABLE 1

Chip specification	1/2.7(MAX6.9mm)
		Lens structure	1G3P
Focal length of lens	3.69mm±10％
		Design object distance	∞
Angle of view	D108°H92°V51°(MAX D112°)
		Lens aperture	F2.0
Total optical length	22.29mm
		Optical back focus	＜5.8mm
Mechanical back coke	＞5.1mm
		Lens MTF	0.7F 160lp/mm≥0.4
Optical distortion	＜33％
		CRA	14°
Relative illumination	Not less than 65% (in the whole view field range)
		Out-of-focus (-30-90 degree)	＜0.01mm

The parameters of the aspherical lens of the large wide-angle optical lens are shown in table 2 below:

TABLE 2

The rise of one point on the aspheric surfaces of the first lens 1, the third lens 3 and the fourth lens 4 along the optical axis direction is z, and the following requirements are met:

wherein c is the curvature corresponding to the aspheric radius, a1, a2, a3, a4, a5, a6, a7, a8 and a9 are all aspheric coefficients, r is the distance from a point on the aspheric surface of the lens to the optical axis, and k is the conic constant of the lens surface.

The aspherical coefficients of the aspherical lens of the large wide-angle optical lens are shown in the following tables 3 to 5:

TABLE 3 first lens aspherical surface coefficient

TABLE 4 third lens aspherical surface coefficient

TABLE 5 fourth lens aspherical surface coefficients

Curved surface numbering	1	2
			1/c	-2.39503188825422	-10.9786634713031
K	-1.91326085386904	6.26873576544253
			a1	0	0
a2	-0.0105606941868665	0.00368235075577039
			a3	0.000864088344651257	-0.000706287585082722
a4	0.000794454955682277	0.000629964774329252
			a5	-0.000425867409127233	-0.00025032818697155
a6	0.000125894496576341	0.0000588355255326778
			a7	-0.0000214893409146028	-8.13447283365221E-06
a8	1.92133703808891E-06	6.07340444899679E-07
			a9	-6.91457419192372E-08	-1.88262698606018E-08

Claims (4)

1. A large wide angle optical lens, characterized by: the lens combination comprises a lens barrel (7), a lens combination, a first diaphragm (5) and a second diaphragm (6), wherein the lens combination is positioned in the lens barrel (7), and the lens combination is formed by sequentially arranging a first lens (1), a second lens (2), a third lens (3) and a fourth lens (4) along the incident direction of light; a first diaphragm (5) and a second diaphragm (6) are respectively arranged on two sides of the second lens (2), the other side of the first diaphragm (5) is abutted against the first lens (1), and the other side of the second diaphragm (6) is abutted against the third lens (3);

the first lens element (1) has a concave object-side surface and a concave image-side surface, and both the object-side surface and the image-side surface are aspheric surfaces;

the object side surface of the second lens (2) is a convex surface, the image side surface of the second lens is a convex surface, and the object side surface and the image side surface of the second lens are spherical surfaces;

the object side surface of the third lens (3) is a convex surface, the image side surface of the third lens is a convex surface, and the object side surface and the image side surface of the third lens are both aspheric surfaces;

the fourth lens element (4) has a concave object-side surface and a convex image-side surface, and both the object-side surface and the image-side surface are aspheric.

2. A large wide-angle optical lens as claimed in claim 1, characterized in that: the second lens (2) is made of glass, and the first lens (1), the third lens (3) and the fourth lens (4) are made of plastic.

3. A large wide-angle optical lens as claimed in claim 1, characterized in that: the focal length f of big wide angle optical lens is 3.569mm, wherein the focal length f1 of first lens (1) is-4.577 mm, the focal length f2 of second lens (2) is 8.184mm, the focal length f3 of third lens (3) is 19.213mm, the focal length f4 of fourth lens (4) is 64.601 mm.

4. A large wide-angle optical lens as claimed in claim 1, characterized in that: the rise of one point on the aspheric surfaces of the first lens (1), the third lens (3) and the fourth lens (4) along the optical axis direction is z, and the following requirements are met:

wherein c is the curvature corresponding to the aspheric radius, a1, a2, a3, a4, a5, a6, a7, a8 and a9 are all aspheric coefficients, r is the distance from a point on the aspheric surface of the lens to the optical axis, and k is the conic constant of the lens surface.

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