CN212515184U - High-pixel large-aperture wide-angle lens - Google Patents

Abstract

The utility model discloses a big light ring wide-angle lens of high pixel, it relates to optical imaging technical field. The optical lens comprises a first lens with negative focal power, a second lens with positive focal power, a diaphragm, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power in sequence from an object space to an image space. The diaphragm is located between the second aspheric lens and the third aspheric lens. The utility model discloses a high pixel, big light ring wide-angle lens have big angle of vision, big light ring, high pixel, big target surface, low-cost advantage.

Description

High-pixel large-aperture wide-angle lens

Technical Field

The utility model relates to an optical imaging technical field, concretely relates to big light ring wide-angle lens of high pixel.

Background

With the development of the market, the requirements of security monitoring equipment, vehicle-mounted shooting and recording equipment, motion DV equipment, automobile data recorders and other equipment on the performance tolerance, pixels and cost of the lens are higher and higher, and the defects of high and low temperature virtual focus, high cost, low pixels and the like exist in the current lenses in the market. The cost of the all-glass lens is expensive and the aperture is small.

To sum up, the utility model designs a big light ring wide-angle lens of high pixel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a big light ring wide-angle camera lens of high pixel, with low costs, the pixel is high, and the light ring is big, and the homoenergetic realizes the formation of image clearly in high temperature, low temperature environment moreover.

In order to achieve the above purpose, the present invention is realized by the following technical solution: a high-pixel large-aperture wide-angle lens comprises a first lens, a second lens, a diaphragm element, a third lens, a fourth lens 5, a fifth lens, an infrared filter, protective glass and a photosensitive chip, wherein the first lens, the second lens, the diaphragm element, the third lens, the fourth lens and the fifth lens are arranged in sequence from an object side to an image side; the focal power of the first lens is negative, the object side surface of the first lens is a convex spherical surface, and the image side surface of the first lens is a concave spherical surface; the focal power of the second lens is positive, the object side surface of the second lens is a concave aspheric surface, and the side surface of the second lens is a convex aspheric surface; the focal power of the third lens is positive, the object-side surface of the third lens is a convex spherical surface, and the image-side surface of the third lens is a convex spherical surface; the focal power of the fourth lens is negative, and both the object-side surface and the image-side surface of the fourth lens are concave aspheric surfaces; the focal power of the fifth lens is positive, the object-side surface of the fifth lens is a convex aspheric surface, and the image-side surface of the fifth lens is a convex aspheric surface.

Preferably, the first lens and the third lens are spherical glass surfaces, and the second lens, the fourth lens and the fifth lens are aspheric plastic surfaces.

Preferably, the total optical focal length of the lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5,

-10<f1/f<-4；

20<f2/f<40；

3<f3/f<7；

-8<f4/f<-4；

3<f5/f<6；

preferably, the optical back focus d of the lens further satisfies the following conditional expression:

1.5<d/f<3

preferably, the first lens (1) has an abbe number vd lens 1, the second lens (2) has an abbe number vd lens 2, the third lens (4) has an abbe number vd lens 3, the fourth lens (5) has an abbe number vd lens 4, the fifth lens (6) has an abbe number vd lens 5, and the respective abbe numbers satisfy the following relations:

vd lens 1≤60；

vd lens 2≤30；

vd lens 3≤60；

vd lens 4≤30；

vd lens 5≤60。

preferably, the aspheric surface shapes of the second lens, the fourth lens and the fifth lens satisfy the following equations:

Z=cy²/{1+[1-(1+k)c²y²]}+a₂y²+a₄y⁴+a₆y⁶+a₈y⁸+a₁₀y¹⁰+a₁₂y¹²+a₁₄y¹⁴+a₁₆y¹⁶(ii) a In the equation, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, and k is the coefficient of the conic section; a is₂To a₁₆Each representing a coefficient corresponding to each radial coordinate.

The utility model discloses following beneficial effect has:

1. the utility model is composed of two glass spheres and three plastic non-spheres, which reduces the cost;

2. the utility model solves the problem of virtual coke at the temperature of-40 ℃ to 85 ℃, and can clearly image under different temperature differences;

3. the image surface height of the utility model can reach phi 6.9 mm;

4. the utility model discloses a light ring can reach 1.6.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

FIG. 1 is a diagram of the structure of the optical path of the present invention;

FIG. 2 is a graph of MTF curve at normal temperature;

FIG. 3 is a defocusing curve of visible light at normal temperature;

FIG. 4 is a defocusing curve of infrared light at normal temperature;

fig. 5 is a defocusing curve chart of the present invention at a temperature of-40 ℃ to 85 ℃.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1 to 5, the following technical solutions are adopted in the present embodiment: the lens comprises a first lens (1), a second lens (2), a diaphragm element (3), a third lens (4), a fourth lens (5), a fifth lens (6), an infrared filter (7), protective glass (8) and a photosensitive chip (9) which are arranged in sequence from an object side to an image side; the focal power of the first lens (1) is negative, the object-side surface (S1) of the first lens is a convex spherical surface, the image-side surface (S2) of the first lens is a concave spherical surface, the focal power of the second lens (2) is positive, the object-side surface (S3) of the second lens is a concave aspheric surface, the image-side surface (S4) of the second lens is a convex aspheric surface, the focal power of the third lens (4) is positive, the object-side surface (S6) of the third lens is a convex spherical surface, the image-side surface (S7) of the third lens is a convex spherical surface, the focal power of the fourth lens (5) is negative, the object-side surface (S8) and the image-side surface (S9) of the fourth lens are both concave aspheric surfaces, the focal power of the fifth lens (6) is positive, the object-side surface (S10) of the fifth lens is a convex aspheric surface, and the image-side surface (S11) of the fifth.

The total focal length of the optical lens is f, the focal length of the first lens 1 is f1, the focal length of the second lens 3 is f2, the focal length of the third lens 4 is f3, the focal length of the fourth lens 5 is f4, the focal length of the fifth lens 6 is f5, and the following relations are simultaneously satisfied by the respective focal lengths:

-10<f1/f<-4；

20<f2/f<40；

3<f3/f<7；

-8<f4/f<-4；

3<f5/f<6；

the optical back focus d of the optical lens of the present embodiment further satisfies the following conditional expression:

1.5<d/f<3

in the present embodiment, the first lens 1 has an abbe number vd 1, the second lens 2 has an abbe number vd 2, the third lens 4 has an abbe number vd 3, the fourth lens 5 has an abbe number vd 4, and the fifth lens 6 has an abbe number vd 5, and the respective abbe numbers satisfy the following relationships:

vd lens 1≤60；

vd lens 2≤30；

vd lens 3≤60；

vd lens 4≤30；

vd lens 5≤60。

the aspherical surface shapes of the second lens 2, the fourth lens 5, and the fifth lens 6 of the present embodiment satisfy the following equations:

Z=cy²/{1+[1-(1+k)c²y²]}+a₂y²+a₄y⁴+a₆y⁶+a₈y⁸+a₁₀y¹⁰+a₁₂y¹²+a₁₄y¹⁴+a₁₆y¹⁶(ii) a In the equation, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, and k is the coefficient of the conic section; a is₂To a₁₆Respectively representing coefficients corresponding to the radial coordinates;

in the above equation, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of y is the same as the unit of the length of the lens, and k is the coefficient of the conic section; a2 to a16 each indicate a coefficient corresponding to each radial coordinate. When k is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when k is equal to-1, the surface-shaped curve of the lens is a parabola; when k is between-1 and 0, the surface curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface curve of the lens is a circle, and when the k coefficient is more than 0, the surface curve of the lens is an oblate circle.

In one embodiment, F is 3.10mm, F/No is 1.6, image height is Φ 6.9mm, TTL is 22.30mm, and FOV is 146 °. The specific face type parameters of each lens are shown in table 1: wherein S5 denotes the surface of the diaphragm element 3, S12 denotes the object side surface of the infrared filter 7, S13 denotes the image side surface of the infrared filter 7, S14 denotes the object side surface of the protective glass 8, and S14 denotes the image side surface of the protective glass 8

TABLE 1

Surface of	Type of noodle	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion
							S0	Subject matter	Plane surface	Infinite number of elements
S1	Spherical surface	29.00	0.56	Glass	1.62	58.5
							S2	Spherical surface	3.32	3.15
S3	Aspherical surface	-6.03	3.12	Plastic cement	1.64	24
							S4	Aspherical surface	-5.70	2.43
S5	STO	Infinity	1.67
							S6	Spherical surface	8.75	2.15	Glass	1.67	55.5
S7	Spherical surface	-8.75	0.39
							S8	Aspherical surface	-39.02	0.65	Plastic cement	1.62	26
S9	Aspherical surface	3.18	0.08
							S10	Aspherical surface	3.78	1.75	Plastic cement	1.53	55.6
S11	Aspherical surface	-5.83	0.3
							S12	Infrared filter	Plane surface	0.3		1.52	64.2
S13	Infrared filter	Plane surface	5.23
							S14	Cover glass	Plane surface	0.4		1.52	64.2
S15	Cover glass	Plane surface	0.045
							Image plane		Plane surface

Specific parameters of each aspherical surface type in Table 1 are shown in Table 2

TABLE 2

Surface of

K

a4

a6

a8

a10

a12

a14

a16

S3

-0.291

-2.52E-04

-1.49E-05

3.03E-06

-1.35E-07

-2.97E-08

-2.56E-10

1.42E-10

S4

-0.236

4.45E-04

2.79E-05

-5.77E-06

3.63E-07

3.24E-08

-7.71E-09

3.81E-10

S8

65.768

-7.95E-03

8.14E-04

-1.23E-04

1.73E-05

-1.12E-06

-2.83E-07

4.11E-08

S9

-2.045

-5.04E-03

8.83E-04

-1.28E-04

2.75E-06

5.08E-07

-5.13E-08

-6.25E-09

S10

0.473

-6.51E-03

-5.37E-05

-2.39E-06

-1.56E-06

1.07E-07

1.21E-07

-7.66E-09

S11

-15.507

-9.64E-03

1.50E-03

-1.90E-04

2.60E-05

-1.84E-06

1.11E-07

2.44E-08

Fig. 2 is an MTF curve at normal temperature in this embodiment, which illustrates that this embodiment can clearly image at normal temperature and has high image quality.

Fig. 3 is a defocus curve at-40 ℃ in this embodiment, fig. 4 is a defocus curve at 85 ℃ in this embodiment, and the results in fig. 5 illustrate that the invention solves the defocus problem at-40 ℃ to 85 ℃ and can clearly image at different temperatures.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The wide-angle lens with high pixel and large aperture is characterized by comprising a first lens (1), a second lens (2), a diaphragm element (3), a third lens (4), a fourth lens (5), a fifth lens (6), an infrared filter (7), protective glass (8) and a photosensitive chip (9) which are arranged from the object side to the image side in sequence; the focal power of the first lens (1) is negative, the object-side surface (S1) of the first lens is a convex spherical surface, and the image-side surface (S2) of the first lens is a concave spherical surface; the focal power of the second lens (2) is positive, the object-side surface (S3) of the second lens is a concave aspheric surface, and the image-side surface (S4) of the second lens is a convex aspheric surface; the focal power of the third lens (4) is positive, the object-side surface (S6) of the third lens is a convex spherical surface, and the image-side surface (S7) of the third lens is a convex spherical surface; the focal power of the fourth lens (5) is negative, and both the object-side surface (S8) and the image-side surface (S9) of the fourth lens are concave aspheric surfaces; the focal power of the fifth lens (6) is positive, the object-side surface (S10) of the fifth lens is a convex aspheric surface, and the image-side surface (S11) of the fifth lens is a convex aspheric surface.

2. The wide-angle lens with high pixel and large aperture as claimed in claim 1, wherein the first lens (1) and the third lens (4) are spherical glass surfaces, and the second lens (2), the fourth lens (5) and the fifth lens (6) are aspheric plastic surfaces.

3. A high pixel large aperture wide-angle lens according to claim 1, wherein the total optical focal length of the lens is f, the focal length of the first lens (1) is f1, the focal length of the second lens (2) is f2, the focal length of the third lens (4) is f3, the focal length of the fourth lens (5) is f4, and the focal length of the fifth lens (6) is f5,

-10<f1/f<-4；

20<f2/f<40；

3<f3/f<7；

-8<f4/f<-4；

3<f5/f<6。

4. a high pixel large aperture wide-angle lens as claimed in claim 1, wherein the optical back focus d of the lens further satisfies the following conditional expression:

1.5<d/f<3。

5. a high-pixel large-aperture wide-angle lens according to claim 1, wherein the first lens (1) has an abbe number vd lens 1, the second lens (2) has an abbe number vd lens 2, the third lens (4) has an abbe number vd lens 3, the fourth lens (5) has an abbe number vd lens 4, and the fifth lens (6) has an abbe number vd lens 5, and the respective abbe numbers satisfy the following relations:

vd lens 1≤60；

vd lens 2≤30；

vd lens 3≤60；

vd lens 4≤30；

vd lens 5≤60。

6. a high pixel large aperture wide-angle lens according to claim 1, wherein the aspheric surface shapes of the second lens (2), the fourth lens (5) and the fifth lens (6) satisfy the following equation:

Z=cy²/{1+[1-(1+k)c²y²]}+a₂y²+a₄y⁴+a₆y⁶+a₈y⁸+a₁₀y¹⁰+a₁₂y¹²+a₁₄y¹⁴+a₁₆y¹⁶(ii) a In the equation, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, and k is the coefficient of the conic section; a is₂To a₁₆Each representing a coefficient corresponding to each radial coordinate.

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