CN112363304A

CN112363304A - Ultra-wide angle optical imaging system and optical equipment

Info

Publication number: CN112363304A
Application number: CN202011345590.3A
Authority: CN
Inventors: 刘瑞军; 陈宝锋
Original assignee: Shenzhen Leiying Photoelectric Technology Co ltd
Current assignee: Shenzhen Leiying Photoelectric Technology Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-02-12

Abstract

The invention provides an ultra-wide angle optical imaging system and optical equipment, which sequentially comprise from an object side to an image side: the lens comprises a first lens group with negative focal power, a second lens group with positive focal power, an aperture diaphragm, a third lens group with positive focal power, a twelfth lens group with negative focal power and a fourth lens group with positive focal power; in the focusing process, the twelfth lens moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group, the third lens group and the fourth lens group relative to the image surface are kept unchanged; the first lens group satisfies the following conditional expression: F1/F is more than or equal to-2.8 and less than or equal to-1.3, (1); the second lens group satisfies the following conditional expression: F2/F is not less than 1.8 and not more than 2.6, (2). The invention also provides an optical device provided with the ultra-wide angle optical imaging system. The focusing assembly of the imaging system only consists of one lens, so that the weight of the focusing assembly and the total weight of the optical imaging system are reduced, and the rapid focusing of the optical imaging system and the imaging equipment is facilitated.

Description

Ultra-wide angle optical imaging system and optical equipment

Technical Field

The invention relates to the technical field of optical imaging, in particular to an ultra-wide angle optical imaging system and optical equipment.

Background

In recent years, in the photography market, due to the high performance and portability of a micro-single camera, the number of users is increasing, and there are various demands for various photography scenes. The original factory-matched lens focal length range which can be used on the half-picture micro-list is still vacant, particularly the wide-angle focal length is left, and the lens of a part of focal lengths is expensive, so that the lens cannot be accepted by all photographing consumers. The micro single-lens camera lens is the same as the single-lens reflex camera lens, and consumers want the micro single-lens camera lens to have high performance and high cost performance. And the volume of the micro single camera is small, the consumer also wants the volume of the lens matched with the micro single camera to be as small as possible relative to the single lens reflex.

Disclosure of Invention

The invention provides an ultra-wide angle optical imaging system and an optical device aiming at the defects and market demands in the prior art, the ultra-wide angle optical imaging system is small in size and light in weight, an internal focusing component is only composed of one lens, and the ultra-wide angle optical imaging system and the optical device have the characteristics of high focusing speed and excellent imaging performance.

In order to achieve the purpose, the invention adopts the following technical scheme:

an ultra-wide angle optical imaging system, comprising in order from an object side to an image side: the lens comprises a first lens group with negative focal power, a second lens group with positive focal power, an aperture diaphragm, a third lens group with positive focal power, a twelfth lens group with negative focal power and a fourth lens group with positive focal power; in the focusing process, the twelfth lens moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group, the third lens group and the fourth lens group relative to the image surface are kept unchanged;

the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence, and the third lens and the fourth lens are combined to form a cemented lens group; the second lens group comprises a sixth lens with positive focal power, a seventh lens with negative focal power and an eighth lens with positive focal power which are arranged in sequence, and the seventh lens and the eighth lens are combined into a cemented lens group; the third lens group comprises a ninth lens with negative focal power, a tenth lens with positive focal power and an eleventh lens with positive focal power which are arranged in sequence, and the ninth lens and the tenth lens are combined into a cemented lens group; the fourth lens group comprises a thirteenth lens with positive focal power and a fourteenth lens with negative focal power which are arranged in sequence;

the first lens group satisfies the following conditional expression:

-2.8≤F1/F≤-1.3，(1)；

the second lens group satisfies the following conditional expression:

1.8≤F2/F≤2.6，(2)

where F denotes a focal length of the optical imaging system, F1 denotes a combined focal length of the first lens group, and F2 denotes a combined focal length of the second lens group.

As a preferable mode, the first lens group and the second lens group satisfy the following conditional expressions:

0.19≤d/D12≤0.33，(3)；

the third lens group satisfies the following conditional expression:

0.003≤(R₃₁-R₃₂)/R₃₁R₃₂≤0.022，(4)

wherein D denotes a distance between the first lens group and the second lens group, D12 denotes a distance from a vertex of the object-side surface of the first lens to the aperture stop, R₃₁Is the value of the radius of curvature, R, of the object-side surface of the ninth lens element₃₂The value of the radius of curvature of the image-side surface of the tenth lens.

As a preferable mode, the twelfth lens satisfies the following conditional expression:

1.80≤Nd4≤1.95，(5)；20≤Vd4≤35，(6)；

the optical imaging system satisfies the following conditional expression:

1.1≤BFL/F≤1.4，(7)；

wherein Nd4 is defined as a refractive index of the twelfth lens with respect to light having a wavelength of 587.6 nm; vd4 is defined as the Abbe number of the twelfth lens with respect to light with the wavelength of 587.6 nm; BFL is the back focal length of the optical imaging system in the infinite state; f is the focal length of the optical imaging system in the infinite state.

Preferably, the third lens, the tenth lens and the thirteenth lens are all low-dispersion lenses with Abbe numbers higher than 70 about light rays with the wavelength of 587.6 nm.

Preferably, the first lens has a negative power, the second lens has a negative power, the third lens has a negative power, and the fourth lens has a positive power.

Preferably, the first lens has a negative power, the second lens has a negative power, the third lens has a positive power, and the fourth lens has a negative power.

Preferably, the first lens group further includes a fifth lens, the fifth lens is disposed on a side of the fourth lens away from the object side surface, the first lens has negative focal power, the second lens has negative focal power, the third lens has negative focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, and the fifth lens is a low dispersion lens having an abbe number higher than 70 with respect to a light ray with a wavelength of 587.6 nm.

Preferably, the fourth lens group further includes a fifteenth lens having positive optical power, and the fifteenth lens is disposed on a side of the fourteenth lens away from the object side surface.

Preferably, the fourth lens group further includes a sixteenth lens having positive optical power, and the sixteenth lens is disposed on a side of the fifteenth lens away from the object side surface.

An optical apparatus is provided with the above-described ultra-wide-angle optical imaging system.

Compared with the prior art, the invention has the following beneficial effects:

the focusing assembly of the ultra-wide angle optical imaging system only consists of one lens, so that the weight of a focusing group and the load of a pushing motor are reduced, and the rapid focusing of the optical imaging system and the imaging equipment is facilitated; under the condition of satisfying the conditional expressions (1) and (2), the first lens group has proper negative focal power to ensure that the lens has a large-caliber wide-angle field of view, and simultaneously the whole lens is small and light, and the second lens group has proper positive focal power to inhibit the light incidence angle of peripheral field of view from being large and compensate vertical chromatic aberration and astigmatism; four lenses with special dispersion and four lenses with ultra-low dispersion are used for inhibiting chromatic aberration, so that purple fringing or dispersion generated at the edge of an object is reduced as much as possible when a high-contrast picture is shot.

To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions attained thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

drawings

FIG. 1 is a schematic structural view showing embodiment 1 of the present invention;

FIG. 2 is a diagram showing spherical aberration in infinity focusing according to embodiment 1 of the present invention;

FIG. 3 is a schematic diagram showing spherical aberration at the closest in-focus distance in embodiment 1 of the present invention;

FIG. 4 shows a schematic view of the curvature of field in infinity focusing according to example 1 of the present invention;

FIG. 5 shows a distortion diagram of embodiment 1 of the present invention in infinity focusing;

FIG. 6 is a schematic view showing curvature of field at the closest in-focus distance in example 1 of the present invention;

FIG. 7 is a diagram showing distortion at the closest in-focus distance in embodiment 1 of the present invention;

FIG. 8 is a schematic structural view showing embodiment 2 of the present invention;

FIG. 9 is a diagram showing spherical aberration in infinity focusing according to embodiment 2 of the present invention;

FIG. 10 is a diagram showing spherical aberration at the closest in-focus distance in embodiment 2 of the present invention;

FIG. 11 shows a schematic view of the curvature of field in infinity focusing according to example 2 of the present invention;

FIG. 12 shows a distortion diagram of embodiment 2 of the present invention in infinity focusing;

FIG. 13 is a schematic view showing curvature of field at the closest in-focus distance in accordance with example 2 of the present invention;

FIG. 14 is a diagram showing distortion at the closest in-focus distance in embodiment 2 of the present invention;

FIG. 15 is a schematic structural view showing embodiment 3 of the present invention;

FIG. 16 is a diagram showing spherical aberration in infinity focusing according to embodiment 3 of the present invention;

FIG. 17 is a diagram showing spherical aberration at the closest in-focus distance in embodiment 3 of the present invention;

FIG. 18 shows a schematic view of the curvature of field in infinity focusing for example 3 of the present invention;

FIG. 19 shows a distortion diagram of embodiment 3 of the present invention in infinity focusing;

FIG. 20 is a schematic view showing curvature of field at the closest in-focus distance in example 3 of the present invention;

FIG. 21 is a diagram showing distortion at the closest in-focus distance in embodiment 3 of the present invention;

FIG. 22 is a schematic structural view showing embodiment 4 of the present invention;

FIG. 23 is a diagram showing spherical aberration in infinity focusing according to embodiment 4 of the present invention;

FIG. 24 is a diagram showing spherical aberration at the closest in-focus distance in accordance with embodiment 4 of the present invention;

FIG. 25 shows a schematic view of the curvature of field in infinity focusing for example 4 of the present invention;

FIG. 26 is a diagram showing distortion in infinity focusing in accordance with example 4 of the present invention;

FIG. 27 is a diagram showing curvature of field at the closest in-focus distance in accordance with example 4 of the present invention;

fig. 28 shows a distortion diagram at the closest in-focus distance in embodiment 4 of the present invention.

Detailed Description

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

As shown in fig. 1 to 28, an ultra-wide angle optical imaging system, in order from an object side to an image side, comprises: a first lens group G1 having negative power, a second lens group G2 having positive power, an aperture stop STP, a third lens group G3 having positive power, a twelfth lens having negative power, a fourth lens group G4 having positive power; the twelfth lens moves along the optical axis towards the image side direction in the process of focusing, and the position of the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4 relative to the image plane is kept unchanged in IMG position;

the first lens group comprises a first lens L11, a second lens L12, a third lens L13 and a fourth lens L14 which are arranged in sequence, the third lens L13 and the fourth lens L14 are combined into a cemented lens, the third lens L13 is a low-dispersion lens with the Abbe number higher than 70 about light with the wavelength of 587.6nm, and the first lens group G1 meets the following conditional expression:

-2.8≤F1/F≤-1.3，(1)

where F denotes a focal length of the optical imaging system, and F1 denotes a composite focal length of the first lens group.

If the conditional expression (1) is met, the first lens group has a reasonable angle of view and a reasonable rear working distance, and the incident height of the light beam in the rear group is in a reasonable interval; if the lower limit of the conditional expression (1) is exceeded, the refractive power of the first lens group G1 decreases, the divergence angle of the front group decreases, and the total length of the lens increases although the burden on the relative aperture diameters of the front and rear groups decreases, which is not recommended. If the refractive power of the first lens group G1 is increased above the upper limit in conditional expression (1), the divergence angle of the front group is further increased, the amount of the off-angle of the rear group is increased, and the burden on the relative aperture of the front and rear groups is increased.

The second lens group G2 comprises a sixth lens L21 with positive focal power, a seventh lens L22 with negative focal power and an eighth lens L23 with positive focal power, which are arranged in sequence, the seventh lens L22 and the eighth lens L23 are combined into a cemented lens group, and the second lens group G2 satisfies the following conditional expression:

1.8≤F2/F≤2.6，(2)

where F denotes a focal length of the optical imaging system, and F2 denotes a composite focal length of the second lens group. The lens group satisfying the conditional expression (2) can effectively correct positive and negative spherical aberration and coma aberration, and simultaneously reduce the effective aperture of light incident to the third lens group G3, reduce the aperture of the third lens group G3 lens and achieve the purpose of reducing the weight of the lens; if the power of the second lens group G2 is increased below the lower limit in the conditional expression (2), a larger beam deflection angle can be shared, which is beneficial to the volume control of the front diaphragm group, but the distortion and astigmatism cannot be corrected well. If it is higher than the upper limit in the conditional expression (2), the power of the second lens group G2 is reduced, and a smaller light deflection angle is borne, so that the negative lens in the first lens group G1 is too bent to be beneficial to manufacturing.

The first lens group and the second lens group satisfy the following conditional expressions:

0.19≤d/D12≤0.33，(3)

where D denotes a distance between the first lens group G1 and the second lens group G2, and D12 denotes a distance from a vertex of the object-side surface of the first lens L12 to the aperture stop STP. And if the condition (3) is met, the total length and the volume of the lens can be controlled within a reasonable range. If it is lower than the lower limit in conditional expression (3), the distance between the first lens group G1 and the second lens group G2 decreases, so that the negative power of the first lens group increases, and at the same time, the positive power of the second lens group also increases, and the deflection angle borne by the rear group of the system increases immediately, causing an increase in aperture-dependent aberration. If the upper limit is higher in the conditional expression (3), the distance between the first lens group and the second lens group increases, so that the total length of the system increases, the volume becomes large, and the miniaturization is not facilitated.

The third lens group G3 comprises a ninth lens L31 with negative focal power, a tenth lens L32 with positive focal power and an eleventh lens L33 with positive focal power, the ninth lens L31 and the tenth lens L32 are combined into a cemented lens group, the tenth lens L32 is a low-dispersion lens with the Abbe number higher than 70 relative to the light with the wavelength of 587.6nm, and the third lens group G3 satisfies the following conditional expression:

0.003≤(R₃₁-R₃₂)/R₃₁R₃₂≤0.022，(4)

wherein R is₃₁Is the ninth lensL31 radius of curvature value of object-side surface, R₃₂The value of the radius of curvature of the image-side surface of the tenth lens L32. And the condition (4) is satisfied, so that the lens is not excessively bent and straight, and the astigmatism is favorably reduced. If the lower limit of the conditional expression (4) is lower, the radius of curvature of the lens is too small, the incident angle of the marginal ray is increased, and the aberration such as astigmatic coma is increased. If the upper limit of the conditional expression (4) is exceeded, the curvature radius of the lens becomes too large, and the astigmatic coma is under-corrected.

The twelfth lens L41 satisfies the following conditional expression:

1.80≤Nd4≤1.95，(5)20≤Vd4≤35，(6)

wherein Nd4 is defined as a refractive index of the twelfth lens L41 with respect to light having a wavelength of 587.6nm, and Vd4 is defined as an abbe number of the twelfth lens with respect to light having a wavelength of 587.6 nm.

The fourth lens group G4 includes a thirteenth lens L51 having positive power and a fourteenth lens L52 having negative power, which are disposed in this order, the thirteenth lens L51 being a low dispersion lens having an abbe number higher than 70 with respect to light having a wavelength of 587.6 nm.

The optical imaging system satisfies the following conditional expression:

1.1≤BFL/F≤1.4，(7)

wherein BFL is the back focal length of the optical system in the infinite state; f is the focal length of the optical system in the infinite state. If the lower limit is less than the lower limit in the conditional expression (7), the back focal length is reduced, and the optical performance is easily ensured, but the interference problem between the lens group structure and the camera mount is easily caused. If the upper limit is higher than the upper limit in the conditional expression (7), the back focal length is too long, which easily increases the overall volume and is not favorable for realizing miniaturization.

The invention also provides an optical device which is provided with the ultra-wide angle optical imaging system.

In the present invention, a parallel glass plate GL configured by a filter is disposed between the fourth lens group G4 and the image plane IMG. The back focal length is a distance from the image side surface of the fourth lens group G4 to the image surface IMG, where the parallel glass plate GL can transform into air.

Example 1

Fig. 1 is a schematic structural diagram of an ultra-wide angle optical imaging system in example 1, in this example 1, the first lens group G1 includes a first lens L11 having negative refractive power, a second lens L12 having negative refractive power, a third lens L13 having negative refractive power, a fourth lens L14 having positive refractive power, and a fifth lens L15 having negative refractive power, which are sequentially disposed, and the fifth lens L15 is a low dispersion lens having an abbe number higher than 70 with respect to light having a wavelength of 587.6 nm.

The numerical data of the ultra-wide angle optical imaging system are shown in table 1, table 2 and table 3:

TABLE 1

TABLE 2

TABLE 3

Wherein, the surface number represents the surface number of each lens from the object side to the image side;

in embodiment 1, the object-side surface and the image-side surface at L12 and L52 are formed to be aspherical. In the following tables, the fourth, sixth, eighth, tenth order aspheric coefficients a4, a6, A8, a10 and the conic constant k of the aspheric surface are shown together.

The aspheric shape definition will be described, and the following embodiments will not be repeated to describe the aspheric shape definition:

and y is the radial coordinate from the optical axis.

z is the offset of the intersection point of the aspheric surface and the optical axis in the direction of the optical axis.

r is the curvature radius of the reference spherical surface of the aspheric surface.

K,

aspheric coefficients

4, 6, 8, 10, 12, 14, 16;

the spherical aberration curve diagram shows the spherical aberration curve when the F-number is 1.4, wherein, the F line, the d line and the C line respectively represent the spherical aberration at a wave length of 486nm, a wave length of 587nm and a wave length of 656nm, the abscissa represents the size of the spherical aberration value, and the ordinate represents the normalized field of view. The field curvature graph represents a field curvature from the imaging center to the periphery, wherein a solid line S represents the value of a main ray d line on a sagittal image surface, a solid line T represents the value of the main ray d line on a meridional image surface, the abscissa represents the magnitude of the field curvature value, and the ordinate represents the field of view. The distortion curve diagram represents a distortion curve from the imaging center to the periphery, in which the abscissa represents the distortion value and the ordinate represents the field of view. The above description of various spherical aberration, curvature of field, distortion graphs is the same as other embodiments, and will not be repeated herein. FIGS. 2-3 are graphs showing spherical aberration in focusing at infinity and in focusing at closest in example 1, and FIGS. 4-7 are graphs showing curvature of field and distortion in focusing at infinity and at closest in example 1. The integral axial chromatic spherical aberration is less than 0.1mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2%, and the original distortion can be basically 0.5% or no distortion by matching with the internal correction of the camera.

Example 2

Fig. 8 is a schematic structural diagram of an ultra-wide angle optical imaging system in embodiment 2, in this embodiment 2, the first lens group G1 includes a first lens L11 with negative power, a second lens L12 with negative power, a third lens L13 with negative power, and a fourth lens L14 with positive power, which are sequentially disposed, the fourth lens group G4 further includes a fifteenth lens L53 with positive power, and the fifteenth lens L53 is disposed on a side of the fourteenth lens L52 away from the object-side surface. Hereinafter, table 4, table 5, and table 6 show various numerical data about the ultra-wide angle optical imaging system of the present embodiment.

TABLE 4

TABLE 5

TABLE 6

Fig. 9 to 10 show spherical aberration diagrams in focusing at infinity and in closest focus in example 2, and fig. 11 to 14 show graphs of curvature of field and distortion in focusing at infinity and in closest focus in example 2. The integral axial chromatic spherical aberration is less than 0.1mm, and the edge of a shot object is not easy to generate chromatic dispersion. The astigmatism at infinity is controlled better, and the off-axis image quality when shooting the night scene of the starry sky has a higher level.

Example 3

Fig. 15 is a schematic structural diagram of an ultra-wide angle optical imaging system in embodiment 3, in this embodiment 3, the first lens group G1 includes a first lens L11 having negative power, a second lens L12 having negative power, a third lens L13 having negative power, a fourth lens L14 having positive power, and a fifth lens L15 having negative power, which are sequentially disposed, and the fifth lens L15 is a low dispersion lens having an abbe number higher than 70 with respect to light having a wavelength of 587.6 nm. Hereinafter, table 7, table 8, and table 9 show various numerical data about the ultra-wide angle optical imaging system of the present embodiment.

TABLE 7

TABLE 8

TABLE 9

FIGS. 16 to 17 are graphs showing spherical aberration at infinity focusing and at closest focusing in example 3, and FIGS. 18 to 21 are graphs showing curvature of field and distortion at infinity and at closest focusing in example 3. The integral axial chromatic spherical aberration is less than 0.1mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2%, and the original distortion can be basically 0.5% or no distortion by matching with the internal correction of the camera.

Example 4

Fig. 22 is a schematic structural diagram of an ultra-wide-angle optical imaging system in embodiment 4, in this embodiment 4, the first lens group G1 includes a first lens L11 with negative power, a second lens L12 with negative power, a third lens L13 with positive power, and a fourth lens L14 with negative power, which are sequentially disposed, the fourth lens group G4 further includes a sixteenth lens L54 with negative power, and the sixteenth lens L54 is disposed on a side of the fifteenth lens L53 away from an object-side surface. Hereinafter, table 10, table 11, and table 12 show various numerical data regarding the ultra-wide angle optical imaging system of the present embodiment.

Watch 10

TABLE 11

TABLE 12

FIGS. 23 to 24 are graphs showing spherical aberration at infinity focusing and at closest focusing in example 4, and FIGS. 25 to 28 are graphs showing curvature of field and distortion at infinity and at closest focusing in example 4. The integral axial chromatic spherical aberration is less than 0.1mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2%, and the original distortion can be basically 0.5% or no distortion by matching with the internal correction of the camera.

Table 13 shows a table of calculated values of conditional expressions 1 to 7 for each example:

watch 13

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An ultra-wide angle optical imaging system, comprising: the device comprises the following components in sequence from an object side to an image side: the lens comprises a first lens group with negative focal power, a second lens group with positive focal power, an aperture diaphragm, a third lens group with positive focal power, a twelfth lens group with negative focal power and a fourth lens group with positive focal power; in the focusing process, the twelfth lens moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group, the third lens group and the fourth lens group relative to the image surface are kept unchanged;

the first lens group satisfies the following conditional expression:

-2.8≤F1/F≤-1.3，(1)；

the second lens group satisfies the following conditional expression:

1.8≤F2/F≤2.6，(2)；

2. The ultra-wide angle optical imaging system of claim 1, wherein: the first lens group and the second lens group satisfy the following conditional expressions:

0.19≤d/D12≤0.33，(3)；

the third lens group satisfies the following conditional expression:

0.003≤(R₃₁-R₃₂)/R₃₁R₃₂≤0.022，(4)

3. The ultra-wide angle optical imaging system of claim 1, wherein:

the twelfth lens satisfies the following conditional expression:

1.80≤Nd4≤1.95，(5)；20≤Vd4≤35，(6)；

the optical imaging system satisfies the following conditional expression:

1.1≤BFL/F≤1.4，(7)；

4. The ultra-wide angle optical imaging system of any one of claims 1 to 3, wherein: the third lens, the tenth lens and the thirteenth lens are all low-dispersion lenses with Abbe numbers higher than 70 about light rays with the wavelength of 587.6 nm.

5. The ultra-wide angle optical imaging system of claim 4, wherein: the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a negative optical power, and the fourth lens has a positive optical power.

6. The ultra-wide angle optical imaging system of claim 4, wherein: the first lens has a negative power, the second lens has a negative power, the third lens has a positive power, and the fourth lens has a negative power.

7. The ultra-wide angle optical imaging system of claim 4, wherein: the first lens group further comprises a fifth lens, the fifth lens is arranged on one side, far away from the object side surface, of the fourth lens, the first lens has negative focal power, the second lens has negative focal power, the third lens has negative focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, and the fifth lens is a low-dispersion lens with the Abbe number higher than 70 about the light with the wavelength of 587.6 nm.

8. The ultra-wide angle optical imaging system of claim 4, wherein: the fourth lens group further comprises a fifteenth lens with positive focal power, and the fifteenth lens is arranged on the side, away from the object side, of the fourteenth lens.

9. The ultra-wide angle optical imaging system of claim 8, wherein: the fourth lens group further comprises a sixteenth lens with positive focal power, and the sixteenth lens is arranged on one side of the fifteenth lens, which is far away from the object side surface.

10. An optical device, characterized by: the optical device is provided with an ultra-wide angle optical imaging system as claimed in any one of claims 1 to 9.