CN117539037B

CN117539037B - Six-piece-type VR super-wide-angle lens

Info

Publication number: CN117539037B
Application number: CN202311647217.7A
Authority: CN
Inventors: 张健; 陈俊宏
Original assignee: Yichang Huaxin Intelligent Optics Co ltd
Current assignee: Yichang Huaxin Intelligent Optics Co ltd
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2024-09-06
Anticipated expiration: 2043-11-30
Also published as: CN117539037A

Abstract

The invention provides a six-piece-type VR ultra-wide angle lens, which comprises six lenses, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the six lenses are sequentially arranged from an object side to an image side along an optical axis; the first lens is a negative lens, is convex towards the object side, and is concave towards the image side; the second lens is a negative lens, is convex towards the object side, and is concave towards the image side; the third lens is a positive lens, and faces the object side to form a convex surface, and the image side is a convex surface; the fourth lens is a positive lens, and faces the object side to form a convex surface, and the image side is a convex surface; the fifth lens is a negative lens, the object side is a concave surface, and the image side is a concave surface; the sixth lens is a negative lens, and is convex towards the object side, and the image side is concave. The VR ultra-wide angle lens adopts the combination of the negative lens group and the positive lens group, matches with specific surface shape and reasonable focal power distribution, has more compact structure while meeting high pixels, realizes miniaturization of the lens and equalization of the high pixels, can shoot scenes with larger area, and ensures the realistic experience of users.

Description

Six-piece-type VR super-wide-angle lens

Technical Field

The invention relates to the field of optical equipment, in particular to a six-piece-type VR ultra-wide angle lens.

Background

VR introduces a full-color perspective solution, which can interact directly with the real world. In the past 4G age, VR technology was limited by limited network computing power, and there were problems of unrealistic look and feel, heavy equipment, etc. that users did not experience in place, which prevented market development in the VR industry. But the arrival of the 5G age enables the VR industry to have breakthrough development in various fields such as education, medical treatment, games, social contact and the like. The rapid development also has higher standards for VR lenses, however, most products on the market are head-mounted, too heavy, and the reality needs to be improved.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention improves the performance of the ultra-wide angle lens and the reality of user experience.

The technical scheme provided by the invention is as follows:

A six-piece type VR ultra-wide angle lens comprises a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;

The first lens is a negative lens, is convex towards the object side, and is concave towards the image side;

the second lens is a negative lens, is convex towards the object side, and is concave towards the image side;

the third lens is a positive lens, the direction of the third lens faces the object side and is a convex surface, and the image side is a convex surface;

the fourth lens is a positive lens, the direction of the fourth lens faces the object side and is a convex surface, and the image side is a convex surface;

the fifth lens is a negative lens, the object side facing the fifth lens is a concave surface, and the image side is a concave surface;

The sixth lens is a negative lens, is convex towards the object side, is concave in the image side, and changes from convex to concave from a paraxial region to a peripheral region in the image side;

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

On the basis of the technical scheme, the invention can also make the following improvements.

Optionally, the focal lengths of the first lens, the second lens and the third lens are front group focal length f123, and the total focal length of the lens is f, which satisfies the following conditions:

The focal lengths of the first lens, the second lens and the third lens are front group focal length f123, the focal lengths of the fourth lens, the fifth lens and the sixth lens are front group focal length f456, and the following conditions are satisfied:

0.5<f123/f456<1。

Optionally, the R value of the first lens facing the image plane is R1, and the refractive index of the first lens is Nd1, which satisfies the following conditions:

0.7<R1/Nd1<1.2。

optionally, the core thickness of the third lens is t3, the total optical length of the lens is TTL, and the following conditions are satisfied:

0.13<t3/TTL<0.18；

the total optical length of the lens is the distance from the first lens to the image plane.

The six-piece-type VR ultra-wide angle lens provided by the invention has the following beneficial effects that the lenses are matched and arranged according to specific surface shapes and reasonable focal power distribution:

(1) The negative lens group-positive lens group cross combination is adopted, and the lens is matched with specific surface shape and reasonable focal power distribution, so that the structure is more compact while the high pixels are satisfied, the miniaturization of the lens and the balance of the high pixels are better realized, a scene with a larger area can be shot, and the realistic experience of a user is ensured.

(2) The ratio of the front group focal length f123 to the back group focal length f456 satisfies 0.5< f123/f456<1, which is favorable for correcting distortion of the lens and improving the performance of the lens.

(3) The ratio of the R value of the head-piece material facing the image surface to the refractive index Nd1 of the first piece of glass material meets 0.7< R1/Nd1<1.2, and the larger the ratio is, the greater the assistance to the lens cutting and the processing yield improvement is.

(4) The ratio of the core thickness T3 of the third lens (L3) to the total length T of the lens is 0.13< T3/T <0.18, which is beneficial to reducing the adverse effect of temperature on the imaging of the lens.

Drawings

Fig. 1 is a schematic structural diagram of a six-piece VR ultra-wide angle lens according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of FFT MTF data of a six-piece VR ultra-wide angle lens according to a first embodiment of the present invention;

Fig. 3 is a schematic diagram of FFT modulation transfer function data of a six-piece VR ultra-wide angle lens with defocus variation at a specific frequency according to a first embodiment of the present invention;

Fig. 4 is a schematic diagram showing a ratio of illuminance at any point on a sensor of a six-piece VR ultra-wide angle lens with a first embodiment of the present invention to maximum illuminance in a field of view;

fig. 5 is a schematic diagram of distortion and curvature of field of light at any pupil of a six-piece VR ultra-wide angle lens according to a first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a six-piece VR ultra-wide angle lens according to a second embodiment of the present invention;

Fig. 7 is a schematic diagram of FFT MTF data of a six-piece VR ultra-wide angle lens according to a second embodiment of the present invention;

fig. 8 is a schematic diagram of FFT modulation transfer function data of a six-piece VR ultra-wide angle lens with defocus variation at a specific frequency according to a second embodiment of the present invention;

Fig. 9 is a schematic diagram showing a ratio of illuminance at any point on a sensor of a six-piece VR ultra-wide angle lens with a second embodiment of the present invention to maximum illuminance in a field of view;

fig. 10 is a schematic diagram of distortion and curvature of field of light at any pupil of a six-piece VR ultra-wide angle lens according to a second embodiment of the present invention;

fig. 11 is a schematic structural diagram of a six-piece VR ultra-wide angle lens according to a third embodiment of the present invention;

Fig. 12 is a schematic diagram of FFT MTF data of a six-piece VR ultra-wide angle lens according to a third embodiment of the present invention;

fig. 13 is a schematic diagram of FFT modulation transfer function data of a six-piece VR ultra-wide angle lens with defocus variation at a specific frequency according to a third embodiment of the present invention;

Fig. 14 is a schematic diagram showing a ratio of illuminance at any point on a sensor of a six-piece VR ultra-wide angle lens with a third embodiment of the present invention to maximum illuminance in a field of view;

fig. 15 is a schematic diagram of distortion and curvature of field of light at any pupil of a six-piece VR ultra-wide angle lens according to a third embodiment of the present invention;

fig. 16 is a schematic structural diagram of a six-piece VR ultra-wide angle lens according to a fourth embodiment of the present invention;

fig. 17 is a schematic diagram of FFT MTF data of a six-piece VR ultra-wide angle lens according to a fourth embodiment of the present invention;

Fig. 18 is a schematic diagram of FFT modulation transfer function data of a six-piece VR ultra-wide angle lens with defocus variation at a specific frequency according to a fourth embodiment of the present invention;

Fig. 19 is a schematic diagram showing a ratio of illuminance at any point on a sensor of a six-piece VR ultra-wide angle lens with a six-piece structure to maximum illuminance in a field of view according to a fourth embodiment of the present invention;

Fig. 20 is a schematic diagram of distortion and curvature of field of light at any pupil of a six-piece VR ultra-wide angle lens according to a fourth embodiment of the present invention;

fig. 21 is a schematic structural diagram of a six-piece VR ultra-wide angle lens according to a comparative example of the present invention;

fig. 22 is a schematic diagram of FFT MTF data of a six-piece VR ultra-wide angle lens according to a comparative example according to the present invention, which varies with the field position;

fig. 23 is a schematic diagram of FFT modulation transfer function data of a six-piece VR ultra-wide angle lens of the comparative example in which defocus varies at a specified frequency;

FIG. 24 is a graph showing the ratio of the illuminance at any point on the sensor of the ultra-wide angle lens with six-plate structure VR according to the comparative example to the maximum illuminance in the field of view;

Fig. 25 is a schematic diagram of distortion and curvature of field of light at any pupil of a six-piece VR ultra-wide angle lens according to a comparative example of the present invention;

In the drawings, the list of components represented by the various numbers is as follows:

l1, first lens, L2, second lens, L3, third lens, L4, fourth lens, L5, fifth lens, L6, sixth lens.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In addition, the technical features of each embodiment or the single embodiment provided by the invention can be combined with each other at will to form a feasible technical scheme, and the combination is not limited by the sequence of steps and/or the structural composition mode, but is necessarily based on the fact that a person of ordinary skill in the art can realize the combination, and when the technical scheme is contradictory or can not realize, the combination of the technical scheme is not considered to exist and is not within the protection scope of the invention claimed.

The invention provides a six-piece VR ultra-wide angle lens, as shown in figure 1, which comprises six lenses, wherein the arrangement sequence of elements from an object side to an image side along an optical axis is as follows: a first lens (L1), a second lens (L2), a third lens (L3), an aperture STOP (STOP), a fourth lens (L4), a fifth lens (L5), and a sixth lens (L6).

The first lens is a negative lens, and is convex towards the object side, and the image side is concave.

The second lens is a negative lens, is convex towards the object side, and is concave towards the image side.

The third lens is a positive lens, and is convex towards the object side, and the image side is convex.

The fourth lens is a positive lens, and faces the object side to form a convex surface, and the image side is a convex surface.

The fifth lens is a negative lens, and is concave towards the object side, and the image side is concave.

The sixth lens element is a negative lens element, and has a convex surface facing the object side and a concave image side, and the image side varies from convex to concave at the paraxial region to peripheral region.

An aperture stop is used in the optical system of the present lens to limit the imaging beam.

The focal lengths of the first lens (L1), the second lens (L2) and the third lens (L3) are front group focal length f123, the focal lengths of the fourth lens (L4), the fifth lens (L3) and the sixth lens (L6) are rear group focal length f456, and the total focal length of the lenses is f; the R value of the first lens (L1) towards the image plane is R1, the focal length of the first lens (L1) is f1, and the refractive index of the first lens is Nd1; the third lens (L3) has a core thickness of t3 and a total lens length of TTL. Each parameter satisfies the following condition:

0.5<f123/f456<1

0.7<R1/Nd1<1.2

0.13<t3/TTL<0.18。

Example 1

The structure of the VR ultra-wide angle lens provided in this embodiment is shown in fig. 1, and in this embodiment, each lens data of the VR ultra-wide angle lens is as follows in table 1.

TABLE 1

The optical parameters of each lens are shown in table 2.

TABLE 2

f123/f456＝	0.535
		R1/Nd1＝	1.04
t3/TTL＝	0.16

Specifically, the data on the lens in example 1 satisfies the following conditions:

0.5<f123/f456<1

(1) The front group focal length and the back group focal length f123/f456=0.535 accord with the range, and the lens can correct distortion and improve optical imaging quality.

0.7<R1/Nd1<1.2

(2) The ratio R1/nd1=1.04 of the value R1 of the first lens (L1) facing the image plane R to the refractive index Nd1 of the first glass material accords with the above range, and can be beneficial to processing and grinding of glass lenses. The processing yield rate with the R value being more than 1.6 can reach 95%, and the processing yield rate with the R value being less than 1.2 can be lower than 40%.

0.13<t3/TTL<0.18

(3) The ratio T3/ttl=0.16 of the core thickness T3 of the third lens (L3) to the total lens length T accords with the above range, and can be beneficial to reducing adverse effects of temperature variation on the lens.

In addition, fig. 2 is a schematic diagram of FFT MTF data of the perspective lens according to the change of the field position of view of the first embodiment; the broken line is an S-direction curve, the solid line is a T-direction curve, and the smoother the curve is, the better the imaging effect of the lens is.

Fig. 3 is a diagram showing FFT modulation transfer function data of defocus variation of a perspective lens of the first embodiment at a specified frequency; it can be seen that the more concentrated the curve, the higher the peak, and the better the corresponding lens imaging effect.

FIG. 4 is a diagram showing the ratio of the illuminance at any point on the sensor of the perspective lens of the first embodiment to the maximum illuminance in the field of view; the curve of fig. 4 is the brightest to darkest of the lens, where the edges cannot be too low.

Fig. 5 is a diagram showing distortion and curvature of field of light at an arbitrary pupil of the perspective lens of the first embodiment. The Wave defines any field of view on the wavelength, distortion and field curvature of light rays at any pupil, wherein a left field curvature graph displays a change curve of the distance from an image surface to a paraxial image surface along with the field coordinates; the right distortion chart shows the difference value between the true image height and the ideal image height of each view field, and the closer to the center, the better the imaging effect.

Example 2

The structure of the VR ultra-wide angle lens provided in this embodiment is shown in fig. 6, and the data of each lens of the VR ultra-wide angle lens in this embodiment is shown in table 3 below.

TABLE 3 Table 3

The optical parameters of each lens are shown in table 3.

TABLE 3 Table 3

f123/f456＝	0.54
		R1/Nd1＝	1.04
t3/TTL＝	0.15

Specifically, the relevant data of the lens in example 2 satisfies the following conditions:

0.5<f123/f456<1

(1) The front group focal length and the back group focal length f123/f 456=0.54 accord with the range, and the lens can correct distortion and improve the optical imaging quality.

0.7<R1/Nd1<1.2

0.13<t3/TTL<0.18

(3) The ratio T3/ttl=0.15 of the core thickness T3 of the third lens (L3) to the total lens length T accords with the above range, and can be beneficial to reducing adverse effects of temperature variation on the lens.

In addition, fig. 7 is a schematic diagram of FFT MTF data of the perspective lens according to the change of the field position of view in the second embodiment; the broken line is an S-direction curve, the solid line is a T-direction curve, and the smoother the curve is, the better the imaging effect of the lens is.

Fig. 8 is a diagram showing FFT modulation transfer function data of defocus variation of a perspective lens of a second embodiment at a specified frequency; it can be seen that the more concentrated the curve, the higher the peak, and the better the corresponding lens imaging effect.

FIG. 9 is a diagram showing the ratio of the illuminance at any point on the sensor of the perspective lens of the second embodiment to the maximum illuminance in the field of view; the curve of fig. 9 is the brightest to darkest of the lens, where the edges cannot be too low.

Fig. 10 is a diagram showing distortion and curvature of field of light at an arbitrary pupil of the perspective lens of the second embodiment. The Wave defines any field of view on the wavelength, distortion and field curvature of light rays at any pupil, wherein a left field curvature graph displays a change curve of the distance from an image surface to a paraxial image surface along with the field coordinates; the right distortion chart shows the difference value between the true image height and the ideal image height of each view field, and the closer to the center, the better the imaging effect.

Example 3

The structure of the VR ultra-wide angle lens provided in this embodiment is shown in fig. 11, and the data of each lens of the VR ultra-wide angle lens in this embodiment is shown in table 5 below.

TABLE 5

The optical parameters of each lens are shown in table 6.

TABLE 6

f123/f456＝	0.58
		R1/Nd1＝	1.05
t3/TTL＝	0.153

Specifically, the relevant data of the lens in example 3 satisfies the following conditions:

0.5<f123/f456<1

(1) The front group focal length and the back group focal length f123/f 456=0.58 accord with the range, and the lens can correct distortion and improve the optical imaging quality.

0.7<R1/Nd1<1.2

(2) The ratio R1/nd1=1.05 of the value R1 of the first lens (L1) facing the image plane R to the refractive index Nd1 of the first glass material accords with the above range, and can be beneficial to processing and grinding of glass lenses. The processing yield rate with the R value being more than 1.6 can reach 95%, and the processing yield rate with the R value being less than 1.2 can be lower than 40%.

0.13<t3/TTL<0.18

(3) The ratio T3/ttl=0.153 of the core thickness T3 of the third lens (L3) to the total lens length T accords with the above range, and can be beneficial to reducing adverse effects of temperature variation on the lens.

Further, fig. 12 is a diagram showing FFT MTF data of a perspective lens according to a field position change of the third embodiment; the broken line is an S-direction curve, the solid line is a T-direction curve, and the smoother the curve is, the better the imaging effect of the lens is.

Fig. 13 is a diagram showing FFT modulation transfer function data of defocus variation of a perspective lens of the third embodiment at a specified frequency; it can be seen that the more concentrated the curve, the higher the peak, and the better the corresponding lens imaging effect.

FIG. 14 is a diagram showing the ratio of the illuminance at any point on the sensor of the perspective lens of the third embodiment to the maximum illuminance in the field of view; the curve of fig. 14 is the brightest to darkest of the lens, where the edges cannot be too low.

Fig. 15 is a diagram showing distortion and curvature of field of light at an arbitrary pupil of the perspective lens of the third embodiment. The Wave defines any field of view on the wavelength, distortion and field curvature of light rays at any pupil, wherein a left field curvature graph displays a change curve of the distance from an image surface to a paraxial image surface along with the field coordinates; the right distortion chart shows the difference value between the true image height and the ideal image height of each view field, and the closer to the center, the better the imaging effect.

Example 4

The structure of the VR ultra-wide angle lens provided in this embodiment is shown in fig. 16, and the data of each lens of the VR ultra-wide angle lens in this embodiment is shown in table 7 below.

TABLE 7

The optical parameters of each lens are shown in table 8.

TABLE 8

f123/f456＝	0.61
		R1/Nd1＝	0.802
t3/TTL＝	0.172

Specifically, the relevant data of the lens in example 4 satisfies the following conditions:

0.5<f123/f456<1

(1) The front group focal length and the back group focal length f123/f456=0.61 accord with the range, and the lens can correct distortion and improve optical imaging quality.

0.7<R1/Nd1<1.2

(2) The ratio R1/nd1=0.802 of the R1 value of the first lens (L1) toward the image plane to the refractive index Nd1 of the first glass material accords with the above range, and can be beneficial to the processing and grinding of the glass lens. The processing yield rate with the R value being more than 1.6 can reach 95%, and the processing yield rate with the R value being less than 1.2 can be lower than 40%.

0.13<t3/TTL<0.18

(3) The ratio T3/ttl=0.172 of the core thickness T3 of the third lens (L3) to the total lens length T accords with the above range, and can be beneficial to reducing adverse effects of temperature variation on the lens.

Further, fig. 17 is a diagram showing FFT MTF data of a perspective lens according to a field position change of the fourth embodiment; the broken line is an S-direction curve, the solid line is a T-direction curve, and the smoother the curve is, the better the imaging effect of the lens is.

Fig. 18 is a diagram showing FFT modulation transfer function data of defocus variation of a perspective lens of the fourth embodiment at a specified frequency; it can be seen that the more concentrated the curve, the higher the peak, and the better the corresponding lens imaging effect.

FIG. 19 is a diagram showing the ratio of the illuminance at any point on the sensor of the perspective lens of the fourth embodiment to the maximum illuminance in the field of view; the curve of fig. 19 is the brightest to darkest of the lens, where the edges cannot be too low.

Fig. 20 is a diagram showing distortion and curvature of field of light at an arbitrary pupil of the perspective lens of the fourth embodiment. The Wave defines any field of view on the wavelength, distortion and field curvature of light rays at any pupil, wherein a left field curvature graph displays a change curve of the distance from an image surface to a paraxial image surface along with the field coordinates; the distortion graph on the right shows the difference between the true image height and the ideal image height of each field, and the closer to the center, the better the imaging effect.

Comparative example

The structure of the VR ultra-wide angle lens provided in this comparative example, in which each lens data of the VR ultra-wide angle lens is as shown in fig. 21, is as follows in table 9.

TABLE 9

The optical parameters of each lens are shown in table 10.

Table 10

f123/f456＝	0.72
		R1/Nd1＝	0.49
t3/TTL＝	0.166

Specifically, the data on the lenses in the comparative example satisfy the following conditions:

0.5<f123/f456<1

(1) The front group focal length and the back group focal length f123/f 456=0.72 accord with the range, and the lens can correct distortion and improve optical imaging quality.

0.13<t3/TTL<0.18

(2) The ratio T3/ttl=0.166 of the core thickness T3 of the third lens (L3) to the total lens length T accords with the above range, and can be beneficial to reducing adverse effects of temperature variation on the lens.

The range of the non-conforming requirements is as follows:

0.7<R1/Nd1<1.2

The ratio R1/nd1=0.49 of the value R1 of the first lens (L1) toward the image plane R to the refractive index Nd1 of the first sheet of glass material does not conform to the above range, and is unfavorable for glass lens processing and polishing, as can be seen from this comparative example: when R1/Nd1 is less than 0.5, the imaging performance of the lens is reduced.

Further, fig. 22 is a diagram of FFT MTF data of a perspective lens of a comparative example as a function of a field position; the broken line is an S-direction curve, the solid line is a T-direction curve, and the smoother the curve, the better the imaging effect of the lens, but the degree of the smoothness of the curve is significantly worse than that of the above-mentioned embodiments 1 to 4.

Fig. 23 is a diagram of FFT modulation transfer function data of defocus variation of a perspective lens of a comparative example at a specified frequency; the more concentrated the curve, the higher the peak, the better the corresponding lens imaging effect, but the concentration of this comparative example is inferior to that of the above-described embodiments 1 to 4.

Fig. 24 is a schematic view showing the ratio of the illuminance at any point on the sensor of the half mirror of the comparative example to the maximum illuminance in the field of view, and fig. 24 is a graph showing the brightest to darkest of the mirror.

Fig. 25 is a schematic view of distortion and curvature of field of light at an arbitrary pupil of the perspective lens of the comparative example. The Wave defines any field of view on the wavelength, distortion and field curvature of light rays at any pupil, wherein a left field curvature graph displays a change curve of the distance from an image surface to a paraxial image surface along with the field coordinates; the right distortion chart shows that the closer to the center the difference between the true image height and the ideal image height of each field of view is, the better the imaging effect is, but the center deviation degree is larger than in the above-described embodiments 1 to 4.

The six-piece-type VR ultra-wide angle lens provided by the invention has the following beneficial effects that the lenses are matched and arranged according to specific surface shapes and reasonable focal power distribution: the negative lens group-positive lens group cross combination is adopted, and the specific surface shape and reasonable focal power distribution are matched, so that the structure is more compact while the high pixels are satisfied, the miniaturization of the lens and the balance of the high pixels are better realized, a scene with a larger area can be shot, and the realistic experience of a user is ensured; the ratio of the front group focal length f123 to the back group focal length f456 satisfies 0.5< f123/f456<1, which is favorable for correcting distortion of the lens and improving the performance of the lens; the ratio of the R value of the head piece material facing the image surface to the refractive index Nd1 of the first piece of glass material meets 0.7< R1/Nd1<1.2, and the larger the ratio is, the larger the lens cutting and processing yield improvement is facilitated, and as can be seen from the above comparative example, when R1/Nd1<0.5, the imaging performance of the lens is reduced; the ratio of the core thickness T3 of the third lens (L3) to the total length T of the lens is 0.13< T3/T <0.18, which is beneficial to reducing the adverse effect of temperature on the imaging of the lens.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The six-piece type VR ultra-wide angle lens is characterized by comprising a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;

the second lens is a negative lens, the object side facing the second lens is a concave surface, and the image side is a concave surface;

The sixth lens is a negative lens, is convex towards the object side, is convex in the image side, and changes from convex to concave from a paraxial region to a peripheral region;

The first lens is made of glass, and the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic; the focal lengths of the first lens, the second lens and the third lens are front group focal length f123, the focal lengths of the fourth lens, the fifth lens and the sixth lens are front group focal length f456, and the following conditions are satisfied:

0.5< f123/f456<1; the R value of the first lens facing the image plane is R1, the refractive index of the first lens is Nd1, and the following conditions are satisfied:

0.7< R1/Nd1<1.2; the core thickness of the third lens is t3, the total optical length of the lens is TTL,

The following conditions are satisfied:

0.13<t3/TTL<0.18；