CN220730511U

CN220730511U - Glimmer full-glass fish-eye lens and electronic equipment

Info

Publication number: CN220730511U
Application number: CN202321056347.9U
Authority: CN
Inventors: 张聪; 赵阳
Original assignee: Changchun Tongshi Optoelectronic Technology Co ltd
Current assignee: Changchun Tongshi Optoelectronic Technology Co ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2024-04-05
Anticipated expiration: 2033-05-06

Abstract

The utility model relates to a low-light full-glass fish-eye lens and electronic equipment; the lens is sequentially arranged from an object side surface to an image side surface along the optical axis of the lens: the first lens, the second lens, the fourth lens, the sixth lens and the nine lenses are spherical lenses with negative focal power, the object side surfaces of the first lens and the six lenses are convex surfaces, and the image side surfaces of the first lens and the six lenses are concave surfaces; the object side surfaces of the second lens and the fourth lens are concave surfaces, and the image side surface is a concave surface; the third lens element, the fifth lens element, the seventh lens element and the eighth lens element are spherical lens elements with positive focal power, wherein the object side surfaces of the third lens element, the fifth lens element, the seventh lens element and the eighth lens element are convex surfaces, and the image side surfaces of the third lens element, the fifth lens element, the seventh lens element and the eighth lens element are convex surfaces; the third lens and the fourth lens are cemented lenses formed by cementing; the sixth lens and the seventh lens are cemented lenses formed by cementing; the object side surface of the ninth lens is a concave surface, the image side surface is a convex surface, and the eighth lens and the ninth lens are cemented lenses formed by cementing; the utility model corrects the aberration of the system, has compact structure among lenses, reduces the use of space ring components, and has the characteristics of small volume, light weight and low cost.

Description

Glimmer full-glass fish-eye lens and electronic equipment

Technical Field

The utility model relates to the technical field of optical lenses, in particular to a low-light full-glass fish-eye lens.

Background

The fisheye lens is an ultra-wide angle lens and is characterized by short focal length and large field angle, in engineering design, a technician generally refers to a lens with the field angle larger than 140 degrees as a fisheye lens, and in practical application, the fisheye lens with the visual angle of 180 degrees is provided, and the fisheye lens with the visual angle exceeding 180 degrees and even reaching 270 degrees is provided. In recent years, fisheye lenses are widely applied to the fields of automobile auxiliary driving, monitoring, engineering measurement, photography and the like.

The fisheye lens is generally composed of a front group and a rear group, wherein the front group is a negative focal power lens, the rear group is a positive focal power lens, and after light passes through the front group lens, an included angle between the light and an optical axis becomes smaller, and the rear group lens mainly corrects aberration of a system.

When the fish-eye lens is applied to automobile auxiliary driving, the lens is required to shoot at night without light and moon light under the condition that the illuminance is 0.001lux, the bright starlight radiation brightness at night is only one percent of the moon light brightness, the night radiation spectrum range has a large amount of light radiation in a near infrared region besides visible light, and the near infrared radiation of the non-moon starry sky is sharply increased and even greatly exceeds the visible light radiation. Most of the current fisheye lenses are only suitable for the visible light range, the wavelength does not contain the near infrared region, so that energy information is lost when an image is shot under night starlight, the relative aperture is small, the illuminance reaching the image surface is insufficient, the requirement of shooting under the night low-illuminance environment cannot be met, the imaging height of the lens is small, and the imaging height cannot be matched with a domestic low-light camera with the chip size of 1inch or 2 inch.

Disclosure of Invention

The utility model aims to provide a compact low-light full-glass fish-eye lens, which adopts 9 spherical glass lenses, wherein the lens materials are all domestic, the processing technology is standardized, and the cost is low; the lens provides high definition image quality under the condition of large field angle,

24-hour all-weather high-definition monitoring can be realized.

In order to solve the technical problems, the utility model is realized by adopting the following technical scheme, and the technical scheme is as follows in combination with the accompanying drawings:

it is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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.

The utility model provides a full glass fisheye lens of shimmer, defines the surface of lens adjacent object plane one side to be the object side, and the surface of lens adjacent image plane one side is the image side, sets up in proper order along the lens optical axis from the object side to the image side:

the first lens is a spherical lens with negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens is a spherical lens with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;

the third lens is a spherical lens with positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the fourth lens is a spherical lens with negative focal power, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a concave surface, and the third lens and the fourth lens are cemented lenses formed by cementing;

the fifth lens is a spherical lens with positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

the image-taking device comprises a sixth lens, a first lens and a second lens, wherein the sixth lens is a spherical lens with negative focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;

a seventh lens which is a spherical lens having positive optical power, the object side surface of which is a convex surface, the image side surface of which is a convex surface, and the sixth lens and the seventh lens are cemented lenses formed by cementing;

an eighth lens element with a convex object-side surface and a convex image-side surface, wherein the eighth lens element is a spherical lens element with positive optical power;

and a ninth lens which is a spherical lens having negative optical power, an object side surface of which is a concave surface, an image side surface of which is a convex surface, and the eighth lens and the ninth lens are cemented lenses formed by cementing.

Further, the lens further comprises an image acquisition element, and the image acquisition element is arranged on the image side surface of the protective glass.

Further, the lens further includes an aperture stop located between the seventh lens and the eighth lens.

Further, the lens satisfies the following condition:

-22.9≤f1/f≤-24.6，

-6.88≤f2/f≤-9.24

-6.23≤f3/f≤-8.36

15.29≤f4/f≤18.96

7.51≤f5/f≤10.05

5.74≤f6/f≤8.43

wherein: f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

Further, the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the first cemented lens, the second cemented lens, and the third cemented lens satisfy the following conditions:

a first lens: -55.61 to-48.02; a second lens: -20.12 to-15.31; and a third lens: 457.53-479.69; fourth lens: -17.93 to-11.73; a fifth lens: 35.08 to 40.54; a sixth lens: 21.33 to 26.08; seventh lens: -60.17 to-54.82; eighth lens: 16.04 to 21.31; ninth lens: 1609.85-1623.27; a first cemented lens: -13.58 to-18.22; a second cemented lens: 16.37-21.91, and 12.51-18.38.

The above range includes two values.

Further, refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens satisfy the following conditions:

ND1：1.50～1.55；ND2：1.55～1.60；ND3：1.68～1.73；ND4：1.53～1.59；ND5：1.67～1.74；ND6：1.74～1.81；ND7：1.53～1.60；ND8：1.70～1.77；ND9：1.81～1.88；

the above range includes two values.

Wherein: ND1 is the refractive index of the first lens;

ND2 is the refractive index of the second lens;

ND3 is the refractive index of the third lens;

ND4 is the refractive index of the fourth lens;

ND5 is the refractive index of the fifth lens;

ND6 is the refractive index of the sixth lens;

ND7 is the refractive index of the seventh lens;

ND8 is the refractive index of the eighth lens;

ND9 is the refractive index of the ninth lens;

further, the radii of curvature of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses satisfy the following condition:

R11：49.67～58.23；R12：15.26～21.54；

R21：-130.58～-113.96；R22：8.23～15.69；

R31：410.36～496.25；R32：-301.69～-347.82；

R41：-298.24～-329.88；R42：5.68～12.11；

R51：63.23～73.56；R52：-47.69～-37.81；

R61：8.55～14.29；R62：3.95～10.84；

R71：4.82～9.46；R72：-51.21～-39.43；

R81：7.24～15.91；R82：-9.58～-1.16；

R91：-7.85～-2.11；R92：-49.19～-30.57；

the above range includes two values.

Wherein: r11 is an object-side radius of curvature of the first lens element, and R12 is an image-side radius of curvature of the first lens element;

r21 is the object-side radius of curvature of the second lens element, and R22 is the image-side radius of curvature of the second lens element;

r31 is the object-side radius of curvature of the third lens element, and R32 is the image-side radius of curvature of the third lens element;

r41 is the object-side radius of curvature of the fourth lens element, and R42 is the image-side radius of curvature of the fourth lens element;

r51 is an object-side radius of curvature of the fifth lens element, and R52 is an image-side radius of curvature of the fifth lens element;

r61 is the object-side radius of curvature of the sixth lens element, and R62 is the image-side radius of curvature of the sixth lens element;

r71 is the object-side radius of curvature of the seventh lens element, and R72 is the image-side radius of curvature of the seventh lens element;

r81 is an object-side radius of curvature of the eighth lens element, and R82 is an image-side radius of curvature of the eighth lens element;

r91 is an object-side radius of curvature of the ninth lens element, and R92 is an image-side radius of curvature of the ninth lens element;

further, abbe constants of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens satisfy the following conditions:

VD1：60.32～70.95；VD2：55.94～68.72；VD3：25.23～35.41；VD4：64.29～77.13；VD5：23.48～36.97；VD6：43.88～56.29；VD7：50.34～61.62；VD8：47.42～56.91；VD9：18.36～28.11；

the above range includes two values.

Wherein VD1 is the abbe constant of the first lens;

VD2 is the abbe constant of the second lens;

VD3 is the abbe constant of the third lens;

VD4 is the abbe constant of the fourth lens;

VD5 is the abbe constant of the fifth lens;

VD6 is the abbe constant of the sixth lens;

VD7 is the abbe constant of the seventh lens;

VD8 is the abbe constant of the eighth lens;

VD9 is the abbe constant of the ninth lens.

Preferably, the focal length of the first lens is-51.9, the focal length of the second lens is-17.4, the focal length of the first cemented lens is-15.29, the focal length of the fifth lens is 38.02, the focal length of the second cemented lens is 19.31, and the focal length of the third cemented lens is 14.1;

ND1 is 1.53, ND2 is 1.56, ND3 is 1.69, ND4 is 1.58, ND5 is 1.68, ND6 is 1.75, ND7 is 1.55, ND8 is 1.71, and ND9 is 1.82;

VD1 at 63.22, vd2 at 60.25, vd3 at 28.51, vd4 at 65.91, vd5 at 30.5, vd6 at 48.6, vd7 at 52.21, vd8 at 50.49, vd9 at 20.08;

the first surface of the first lens has a curvature radius of 57.93, and the second surface has a curvature radius of 15.48; the curvature radius of the first surface of the second lens is-119.56, and the curvature radius of the second surface is 12.98; the curvature radius of the first surface of the first cemented lens is 429.81, and the curvature radius of the second surface of the first cemented lens is 10.05; the curvature radius of the first surface of the fifth lens is 68.45, and the curvature radius of the second surface of the fifth lens is-41.95; the curvature radius of the first surface of the second cemented lens is 11.89, and the curvature radius of the second surface is-42.31; the curvature radius of the first surface of the third cemented lens is 10.17, and the curvature radius of the second surface is-38.27;

the value of the center thickness of L1 is 4, the value of the center thickness of L2 is 2, the value of the center thickness of L3 is 5.5, the value of the center thickness of L4 is 3.5, the value of the center thickness of L5 is 6, and the value of the center thickness of L6 is 5; the air interval between L1 and L2 is 17, the air interval between L2 and L3 is 4, the air interval between L3 and L4 is 11.8, the air interval between L4 and L5 is 3, the air interval between L5 and L6 is 3, and the air interval between L6 and the image plane is 8.

An electronic device comprises the micro-light full-glass fish-eye lens and an imaging element for converting an optical image formed by the micro-light full-glass fish-eye lens into an electric signal.

Compared with the prior art, the utility model has the beneficial effects that:

the compact low-light full-glass fish-eye lens adopts 9 spherical glass sheets, so that the aberration of the system is corrected to the greatest extent, the performance is excellent, the structure among lenses is compact, the use of space ring components is reduced, the compact low-light full-glass fish-eye lens has the characteristics of small volume, light weight, low cost and the like, the cost performance is high, the characteristics of small volume, light weight, good performance and low cost can be realized, and the utility model realizes 24-hour all-weather high-definition monitoring, day and night imaging confocal and real-shot picture definition through reasonable lens material selection, optical power distribution and optical design optimization.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of embodiment 1 of the present utility model;

FIG. 2 is a transfer function diagram of embodiment 1 of the present utility model;

FIG. 3 is a graph showing field curvature and distortion in example 1 of the present utility model;

FIG. 4 is a schematic structural diagram of embodiment 2 of the present utility model;

FIG. 5 is a transfer function diagram of embodiment 2 of the present utility model;

FIG. 6 is a graph showing field curvature and distortion curve of example 2 of the present utility model;

FIG. 7 is a schematic structural diagram of embodiment 3 of the present utility model;

FIG. 8 is a transfer function diagram of embodiment 3 of the present utility model;

fig. 9 is a field curvature and distortion curve of example 3 of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model become more apparent, the technical solutions in the embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings in the embodiments of the present utility model. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present utility model, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.

The utility model is described in detail below with reference to the attached drawing figures:

24-hour all-weather high-definition monitoring can be realized.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides a full glass fisheye lens of compact shimmer, defines the surface of lens adjacent object plane one side to be the object side, and the surface of lens adjacent image plane one side is the image side, sets up in proper order along the lens optical axis from object side to image side:

a ninth lens which is a spherical lens having negative optical power, an object side surface of which is a concave surface, an image side surface of which is a convex surface, and the eighth lens and the ninth lens are cemented lenses formed by cementing;

the image acquisition element is arranged on the image side surface of the protective glass;

the lens further includes an aperture stop located between the seventh lens and the eighth lens.

The lens satisfies the following conditions:

-22.9≤f1/f≤-24.6，

-6.88≤f2/f≤-9.24

-6.23≤f3/f≤-8.36

15.29≤f4/f≤18.96

7.51≤f5/f≤10.05

5.74≤f6/f≤8.43

the thickness of the center of each lens is (2-6), (1-4), (3-9), (1-5), (3-9) and (3-7), and the air interval is (15-21), (1-5), (10.5-15.5), (1-4), (1-5) and (5-10) in turn.

The center thicknesses are respectively a first lens, a second lens, a first cemented lens (composed of a third lens and a fourth lens), a fifth lens, a second cemented lens (a sixth lens and a seventh lens), and a third cemented lens (an eighth lens and a ninth lens);

the air space is the first lens and the second lens respectively, and so on, and the last air space is the third cemented lens to the image plane.

In the relation, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

Further, the focal lengths, refractive indexes, curvature radii, abbe constants (VD) of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens respectively satisfy the following conditions:

f1

-55.61～-48.02

ND1

1.50～1.55

R11

49.67～58.23

R12

15.26～21.54

VD1

60.32～70.95

f2

-20.12～-15.31

ND2

1.55～1.60

R21

-130.58～-113.96

R22

8.23～15.69

VD2

55.94～68.72

f3

457.53～479.69

ND3

1.68～1.73

R31

410.36～496.25

R32

-301.69～-347.82

VD3

25.23～35.41

f4

-17.93～-11.73

ND4

1.53～1.59

R41

-298.24～-329.88

R42

5.68～12.11

VD4

64.29～77.13

f5

35.08～40.54

ND5

1.67～1.74

R51

63.23～73.56

R52

-47.69～-37.81

VD5

23.48～36.97

f6

21.33～26.08

ND6

1.74～1.81

R61

8.55～14.29

R62

3.95～10.84

VD6

43.88～56.29

f7

-60.17～-54.82

ND7

1.53～1.60

R71

4.82～9.46

R72

-51.21～-39.43

VD7

50.34～61.62

f8

16.04～21.31

ND8

1.70～1.77

R81

7.24～15.91

R82

-9.58～-1.16

VD8

47.42～56.91

f9

1609.85～1623.27

ND9

1.81～1.88

R91

-7.85～-2.11

R92

-49.19～-30.57

VD9

18.36～28.11

wherein f1 is a focal length of the first lens element, ND1 is a refractive index of the first lens element, R11 is an object-side surface radius of curvature of the first lens element, R12 is an image-side surface radius of curvature of the first lens element, and VD1 is an abbe constant of the first lens element;

f2 is the focal length of the second lens element, ND2 is the refractive index of the second lens element, R21 is the object-side radius of curvature of the second lens element, R22 is the image-side radius of curvature of the second lens element, and VD2 is the abbe's constant of the second lens element;

f3 is the focal length of the third lens element, ND3 is the refractive index of the third lens element, R31 is the object-side radius of curvature of the third lens element, R32 is the image-side radius of curvature of the third lens element, and VD3 is the abbe's constant of the third lens element;

f4 is a focal length of the fourth lens element, ND4 is a refractive index of the fourth lens element, R41 is an object-side radius of curvature of the fourth lens element, R42 is an image-side radius of curvature of the fourth lens element, and VD4 is an abbe constant of the fourth lens element;

f5 is a focal length of the fifth lens element, ND5 is a refractive index of the fifth lens element, R51 is an object-side radius of curvature of the fifth lens element, R52 is an image-side radius of curvature of the fifth lens element, and VD5 is an abbe constant of the fifth lens element;

f6 is a focal length of the sixth lens element, ND6 is a refractive index of the sixth lens element, R61 is an object-side radius of curvature of the sixth lens element, R62 is an image-side radius of curvature of the sixth lens element, and VD6 is an abbe constant of the sixth lens element;

f7 is the focal length of the seventh lens element, ND7 is the refractive index of the seventh lens element, R71 is the object-side radius of curvature of the seventh lens element, R72 is the image-side radius of curvature of the seventh lens element, and VD7 is the abbe's constant of the seventh lens element;

f8 is the focal length of the eighth lens element, ND8 is the refractive index of the eighth lens element, R81 is the object-side radius of curvature of the eighth lens element, R82 is the image-side radius of curvature of the eighth lens element, and VD8 is the abbe's constant of the eighth lens element;

f9 is a focal length of the ninth lens, ND9 is a refractive index of the ninth lens, R91 is an object-side surface radius of curvature of the ninth lens, R92 is an image-side surface radius of curvature of the ninth lens, and VD9 is an abbe constant of the ninth lens;

the "-" sign indicates that the surface is curved to the object plane side.

In the present utility model, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, the lens surface is concave at least in the paraxial region; when the lens surface is not limited to a convex surface, a concave surface or a plane surface, it means that the lens surface may be a convex surface, a concave surface or a plane surface. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

As shown in fig. 1, a surface of the optical system lens adjacent to an object plane side of the present utility model is an object side surface, a surface of the lens adjacent to an image plane side is an image side surface, and the optical system lens sequentially comprises, from the object side to the image side along an optical axis of the lens: the lens G1 with negative focal power, the lens G2 with negative focal power, the cemented lens G3 with negative focal power, the lens G4 with positive focal power, the cemented lens G5 with positive focal power, the cemented lens G6 with positive focal power are sequentially arranged along the optical axis direction, and a diaphragm is arranged on an optical path between the cemented lens G5 and the cemented lens G6.

The lens of the lens meets the following conditions:

-22.9≤f1/f≤-24.6

-6.88≤f2/f≤-9.24

-6.23≤f3/f≤-8.36

15.29≤f4/f≤18.96

7.51≤f5/f≤10.05

5.74≤f6/f≤8.43

wherein f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

Example 1

The lens parameters are shown in Table 1. Table 1 shows the radii of curvature (unit: mm) of the first lens L1, the second lens L2, the first cemented lens L3, the fifth lens L4, the second cemented lens L5, and the third cemented lens L6, the center thickness/air spacing (unit: mm) of each lens, the refractive index (ND) and the Abbe constant (VD) of each lens

TABLE 1

L4 refers to the fifth lens, so its radius of curvature, center thickness/air gap, refractive index, abbe constant refer to the fifth lens; l5 is a second cemented lens (formed by cementing the sixth lens and the seventh lens), so that the curvature radius corresponds to the curvature radius of the first surface of the sixth lens and the second surface of the seventh lens, the center thickness is the sum of the center thicknesses of the sixth lens and the seventh lens, and the refractive index and the Abbe constant are the refractive index and the Abbe constant of the sixth lens and the seventh lens respectively; l6 is a third cemented lens (formed by the eighth and ninth lenses cemented), so that the radius of curvature corresponds to the radius of curvature of the first surface of the eighth lens and the second surface of the ninth lens, the center thickness is the sum of the thicknesses of the centers of the eighth lens and the ninth lens, and the refractive index and the Abbe constant are the refractive index and the Abbe constant of the eighth lens and the ninth lens, respectively;

referring to fig. 1, there is shown a schematic view of an optical structure and an optical path structure. In this embodiment, the total focal length f=2.18 mm, the aperture f# =2, the angle dfov=170°, and the total optical length TTL of the lens=72.8 mm.

In this embodiment, the first lens adopts a lens with a convex surface facing the object side and having a meniscus negative focal power, which is effective in rapidly converging light, and the abbe constants of the first lens 1 and the second lens 2 are greater than or equal to 58.5, so that the chromatic aberration of the system can be reduced, and the problems of aberration of the optical system, day-night confocal and the like are considered.

In this embodiment, the MTF curve and the ftheta distortion curve of the lens are shown in fig. 2 and 3, respectively.

The MTF graph of the fish-eye lens in this example is shown, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from fig. 2, the lens is above 0.45 at a spatial frequency of 125lp/mm, indicating that the fisheye lens has a higher resolution.

In this embodiment, the F Theta distortion graph of the fisheye lens is shown, the horizontal axis represents F Theta distortion (unit:%), and the vertical axis represents half field angle (unit: °) as can be seen from fig. 3, the F Theta distortion of the lens is smaller and smaller than 15%, which indicates that the distortion of the fisheye lens is well corrected, and the real shot image and the real scene cannot be deformed too much.

Example 2

The lens parameters are shown in Table 2. Table 2 shows the radii of curvature (unit: mm) of the first lens L1, the second lens L2, the first cemented lens L3, the fourth lens L4, the second cemented lens L5, and the third cemented lens L6, the center thickness/air spacing (unit: mm) of each lens, the refractive index (ND) of each lens, and the abbe constant (VD).

TABLE 2

Referring to fig. 4, an optical structure and an optical path structure are schematically shown. In this embodiment, the total focal length f=2.16 mm, the aperture f# =2, the angle dfov=170°, and the total optical length TTL of the lens=71.8 mm.

In this embodiment, the MTF curve and the ftheta distortion curve of the lens are shown in fig. 5 and 6, respectively.

The MTF graph of the fish-eye lens in this example is shown, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from fig. 5, the lens is matched with more than 0.45 at a spatial frequency of 125lp/mm, which indicates that the fisheye lens has higher resolution.

In this example, the F Theta distortion diagram of the fish-eye lens is shown, the horizontal axis represents F Theta distortion (unit:%) and the vertical axis represents half field angle (unit: °). As can be seen from fig. 6, the F Theta distortion of the lens is small and less than 15%, which means that the distortion of the fisheye lens is well corrected, and the real shot picture and the real scene cannot be excessively deformed.

Example 3

The lens parameters are shown in Table 3. Table 3 shows the radii of curvature (unit: mm) of the first lens L1, the second lens L2, the first cemented lens L3, the fourth lens L4, the second cemented lens L5, and the third cemented lens L6, the center thickness/air spacing (unit: mm) of each lens, the refractive index (ND) and the Abbe constant (VD) of each lens

TABLE 3 Table 3

Referring to fig. 7, an optical structure and an optical path structure are schematically shown. In this embodiment, the total focal length f=2.15 mm, the aperture f# =2, the angle dfov=170°, and the total optical length TTL of the lens=74.6 mm.

In this embodiment, the MTF curve and the ftheta distortion curve of the lens are shown in fig. 8 and 9, respectively.

The MTF graph of the fish-eye lens in this example is shown, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from fig. 8, the lens is matched with more than 0.45 at a spatial frequency of 125lp/mm, which indicates that the fisheye lens has higher resolution.

In this example, the F Theta distortion diagram of the fish-eye lens is shown, the horizontal axis represents F Theta distortion (unit:%) and the vertical axis represents half field angle (unit: °). As can be seen from fig. 9, the F Theta distortion of the lens is small and less than 15%, which means that the distortion of the fisheye lens is well corrected, and the real shot picture and the real scene cannot be excessively deformed.

The application also provides electronic equipment, which can comprise the micro-light full-glass fish-eye lens and an imaging element for converting an optical image formed by the micro-light full-glass fish-eye lens into an electric signal. The electronic device may be a stand-alone electronic device such as a detection range camera or may be an imaging module integrated with such a detection range device. The electronic device may be a stand-alone imaging device such as an onboard camera, or may be an imaging module integrated with devices such as a driving assistance system, monitoring, engineering measurements, and photography.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the utility model is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model will be apparent to those skilled in the art within the scope of the present utility model. And all that is not described in detail in this specification is well known to those skilled in the art.

Claims

1. The utility model provides a full glass fish-eye lens of shimmer, defines the surface of lens adjacent object plane one side to be the object side, and the surface of lens adjacent image plane one side is the image side, its characterized in that, along the lens optical axis from object side to image side set up in proper order:

2. The low-light full-glass fish-eye lens of claim 1, wherein:

the lens further comprises an image acquisition element, and the image acquisition element is arranged on the image side surface of the protective glass.

3. The low-light full-glass fish-eye lens of claim 1, wherein:

4. The low-light full-glass fish-eye lens of claim 1, wherein:

the lens satisfies the following conditions:

-22.9≤f1/f≤-24.6，

-6.88≤f2/f≤-9.24

-6.23≤f3/f≤-8.36

15.29≤f4/f≤18.96

7.51≤f5/f≤10.05

5.74≤f6/f≤8.43

5. A micro-optical full-glass fish-eye lens according to any one of claims 1 to 4, wherein:

the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the first cemented lens, the second cemented lens and the third cemented lens meet the following conditions:

6. The micro-optical all-glass fish-eye lens of claim 5, wherein:

the refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens meet the following conditions:

wherein: ND1 is the refractive index of the first lens;

ND2 is the refractive index of the second lens;

ND3 is the refractive index of the third lens;

ND4 is the refractive index of the fourth lens;

ND5 is the refractive index of the fifth lens;

ND6 is the refractive index of the sixth lens;

ND7 is the refractive index of the seventh lens;

ND8 is the refractive index of the eighth lens;

ND9 is the refractive index of the ninth lens.

7. The micro-optical all-glass fish-eye lens of claim 6, wherein:

the radii of curvature of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses satisfy the following conditions:

R11：49.67～58.23；R12：15.26～21.54；

R21：-130.58～-113.96；R22：8.23～15.69；

R31：410.36～496.25；R32：-301.69～-347.82；

R41：-298.24～-329.88；R42：5.68～12.11；

R51：63.23～73.56；R52：-47.69～-37.81；

R61：8.55～14.29；R62：3.95～10.84；

R71：4.82～9.46；R72：-51.21～-39.43；

R81：7.24～15.91；R82：-9.58～-1.16；

R91：-7.85～-2.11；R92：-49.19～-30.57；

r91 is the object-side radius of curvature of the ninth lens, and R92 is the image-side radius of curvature of the ninth lens.

8. The micro-optical all-glass fish-eye lens of claim 7, wherein:

the abbe constants of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens meet the following conditions:

wherein VD1 is the abbe constant of the first lens;

VD2 is the abbe constant of the second lens;

VD3 is the abbe constant of the third lens;

VD4 is the abbe constant of the fourth lens;

VD5 is the abbe constant of the fifth lens;

VD6 is the abbe constant of the sixth lens;

VD7 is the abbe constant of the seventh lens;

VD8 is the abbe constant of the eighth lens;

VD9 is the abbe constant of the ninth lens.

9. The micro-optical all-glass fish-eye lens of claim 8, wherein:

the focal length of the first lens is-51.9, the focal length of the second lens is-17.4, the focal length of the first cemented lens is-15.29, the focal length of the fifth lens is 38.02, the focal length of the second cemented lens is 19.31, and the focal length of the third cemented lens is 14.1;

the first surface of the first lens has a curvature radius of 57.93, and the second surface has a curvature radius of 15.48; the curvature radius of the first surface of the second lens is-119.56, and the curvature radius of the second surface is 12.98; the curvature radius of the first surface of the first cemented lens is 429.81, and the curvature radius of the second surface of the first cemented lens is 10.05; the curvature radius of the first surface of the fifth lens is 68.45, and the curvature radius of the second surface of the fifth lens is-41.95; the curvature radius of the first surface of the second bonding mirror is 11.89, and the curvature radius of the second surface is-42.31; the curvature radius of the first surface of the third bonding mirror is 10.17, and the curvature radius of the second surface of the third bonding mirror is-38.27;

the value of the center thickness of L1 is 4, the value of the center thickness of L2 is 2, the value of the center thickness of L3 is 5.5, the value of the center thickness of L4 is 3.5, the value of the center thickness of L5 is 6, and the value of the center thickness of L6 is 5; the air interval between L1 and L2 is 17, the air interval between L2 and L3 is 4, the air interval between L3 and L4 is 11.8, the air interval between L4 and L5 is 3, the air interval between L5 and L6 is 3, and the air interval between L6 and the image plane is 8;

wherein L1 is a first lens;

l2 is a second lens;

l3 is a first cemented lens;

l4 is a fifth lens;

l5 is a second cemented lens;

l6 is a third cemented lens.

10. An electronic device, characterized in that: an imaging element comprising the micro-optical full-glass fish-eye lens of any one of claims 1 to 9 for converting an optical image formed by the micro-optical full-glass fish-eye lens into an electrical signal.