CN211955958U

CN211955958U - Ultrashort high definition wide-angle lens

Info

Publication number: CN211955958U
Application number: CN202020572778.0U
Authority: CN
Inventors: 李彦锋
Original assignee: Shenzhen Huashi Chengjin Technology Co ltd
Current assignee: Shenzhen Huashi Chengjin Technology Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-11-17
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses an ultrashort high-definition wide-angle lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object space to an image space; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical glass lenses; the first lens and the second lens are meniscus negative focal power lenses, the third lens and the fourth lens are double-convex positive focal power lenses, and the fifth lens and the sixth lens are cemented lens groups; and a diaphragm disposed between the third lens and the fourth lens. By the proposal, the utility model discloses it is big to have reached total angle of vision, and the camera lens is made the degree of difficulty little, satisfies the effect of high-definition quality requirement such as on-vehicle, panorama camera.

Description

Ultrashort high definition wide-angle lens

Technical Field

The utility model relates to an optical imaging technical field, concretely relates to ultrashort high definition wide-angle camera lens.

Background

In recent years, high-resolution high-definition fisheye lenses are widely applied to security monitoring, vehicle-mounted equipment and the like. With the advent of VR technology and panoramic photography, a wide-angle lens with a large field of view becomes an indispensable core component in such devices. The traditional high-definition wide-angle lens is usually an all-glass lens, and the lens has longer optical total length and higher price. Some products adopt a mode of combining an aspheric plastic lens and a glass lens to reduce weight and cost, but the optical performance is influenced by the ambient temperature, the problem of focus drift exists, the working range is-45-75 ℃, the thermal difference is large, and the requirement of high-definition quality of a lens cannot be met. And a product can also use a glass aspheric surface, so that the requirements of a large field angle and high definition can be met, but the glass aspheric surface processing and detecting technology is not generalized and has higher cost.

Therefore, the utility model discloses a total angle of vision is greater than 190, and the camera lens is made the degree of difficulty little, satisfies the ultrashort high definition wide-angle camera lens of high-definition quality requirements such as on-vehicle, panoramic photography.

SUMMERY OF THE UTILITY MODEL

To the above problem, an object of the utility model is to provide an ultrashort high definition wide-angle lens, the utility model discloses a technical scheme as follows:

an ultrashort high-definition wide-angle lens comprises a first lens 1, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter which are sequentially arranged from an object side to an image side; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical glass lenses; the first lens and the second lens are meniscus negative focal power lenses, the third lens and the fourth lens are double-convex positive focal power lenses, and the fifth lens and the sixth lens are cemented lens groups; and a diaphragm disposed between the third lens and the fourth lens.

Further, the ratio of the focal length f1 of the first lens to the focal length f of the ultra-short high-definition wide-angle lens satisfies:

2.0<|f1/f|<3.0。

further, the following relationship is satisfied among the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f5 of the fifth lens, and the focal length f6 of the sixth lens:

0.51<|f2/f3|<0.75；

0.65<|f5/f6|<0.85。

further, the refractive index nd1 of the first lens satisfies: nd1>1.62, the Abbe number v1 of the first lens satisfies: v1> 60; the refractive index nd2 of the second lens satisfies: nd2>1.62, and the second lens has an Abbe number v2 satisfying: v2> 60; the refractive index nd3 of the third lens satisfies: nd3>1.75, and the third lens has an Abbe number v3 satisfying: v3< 30; the refractive index nd4 of the fourth lens satisfies: nd4<1.65, and the Abbe number v4 of the fourth lens satisfies: v4> 58; the refractive index nd5 of the fifth lens satisfies: nd5<1.6, and the Abbe number v5 of the fifth lens satisfies: v5> 60; the refractive index nd6 of the sixth lens satisfies: nd6>1.8, and the Abbe number v6 of the sixth lens satisfies: v6< 25.

Further, the total optical length L of the ultrashort high-definition wide-angle lens satisfies: 14.1< L < 15.1.

Further, the half-image height H of the ultra-short high-definition wide-angle lens and the total optical length L of the ultra-short high-definition wide-angle lens satisfy: H/L > 0.2.

Further, the effective aperture D1 of the first lens, the half-image height H of the lens, the optical total length L, the back focal length BFL, and the lens focal length f satisfy the following conditions:

D1/H>1.7；

D1/L>0.3；

1.65<BFL/f<1.85。

compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses set up the diaphragm ingeniously between third lens and fourth lens, effectively adjusted the light beam intensity through the camera lens, promoted the result of use of camera lens greatly.

(2) The utility model discloses a total angle of vision of wide angle camera lens is greater than 190, not only has the broad field of vision, has satisfied camera lens high definition quality requirements such as on-vehicle, panorama camera, has avoided the strong distortion that the camera lens produced moreover.

(3) The utility model discloses set up arbitrary lens into spherical glass lens ingeniously, reduced the manufacturing cost and the manufacturing degree of difficulty of camera lens.

(4) The utility model discloses a corresponding arbitrary lens and having set up different parameters, the sensitivity of having guaranteed whole optical system when realizing that design imaging performance is excellent is lower in the trend of reasonable control light path, has satisfied the camera lens machining tolerance requirement.

(5) The utility model sets any lens as spherical glass lens, effectively reducing the total optical length of the lens and having low cost; and the spherical glass lens has better universality, and the difficulty in later-stage maintenance of the lens is reduced.

(6) The utility model discloses an optical property receives ambient temperature and the influence of the work difference in temperature little, can satisfy the requirement of camera lens high definition quality.

(7) The utility model discloses set up fifth lens and sixth lens into the veneer lens group ingeniously, played the effect of gathering light beam effectively.

(8) The utility model discloses set up first lens and second lens as falcate negative power lens ingeniously, from this first lens and second lens have formed the preceding negative lens group, the off-axis incident light is dispersed, make the contained angle of wide visual angle light and optical axis reduce greatly, thus has reduced the angle of view that the follow-up component corresponds apparently, make the aberration correct easier; in addition, after the light on the shaft is diffused by the negative lens group, the subsequent component has larger aperture, and simultaneously, because the marginal illuminance of the visual field of the optical system and the illuminance of the visual field center are attenuated according to the fourth power of the cosine of the included angle with the optical axis, the marginal illuminance can be quickly reduced, so that a large amount of barrel-shaped distortion is introduced into the front negative lens group, the half field angle of an image can be reduced, the slow reduction of the marginal illuminance is ensured, and the uniformity of the image surface illuminance distribution is improved; on the other hand, the front negative lens group can generate enough barrel distortion to ensure that the imaging can be carried out when the half field angle of an object is larger than 90 degrees.

(9) The utility model discloses the positive focal power lens of biconvex and fifth lens and the sixth lens that third lens, fourth lens adopted all adopt the veneer lens group to constitute back positive lens group jointly, have effectively compensated the partial aberration that the preceding negative lens group of compriseing first lens and second lens left over.

(10) The utility model discloses set up the third lens into biconvex lens ingeniously, adopt the high dispersion material of high refracting index, can gather the light that the preceding negative lens group of lens was come fast to the colour difference among the compensation optical system.

(11) The utility model discloses set up the fourth lens into biconvex lens ingeniously, can further gather light, reduce light incident image surface height, simultaneously, the aberration that spherical glass lens formed has effectively been rectified with the diaphragm combined action that sets up between third lens and fourth lens to the fourth lens.

(12) The utility model discloses set up fifth lens and sixth lens into the veneer lens group ingeniously, can effectively rectify the colour difference in the system.

(13) The utility model discloses well first lens and second lens have constituteed negative field jointly and have bent, constitute jointly by third lens and fourth lens and provide positive field, compensated the negative field of first lens and second lens constitution effectively and bent.

The utility model relates to an ultrashort high definition wide-angle camera lens has very high practical value and spreading value in optical imaging technical field.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as a limitation of the scope of protection, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

Fig. 1 is a schematic view of the optical principle of the present invention;

FIG. 2 is a graph of MTF at 100lp/mm according to an embodiment of the present invention;

fig. 3 is a graph of magnification chromatic aberration of the embodiment of the present invention;

fig. 4 is a defocus graph according to an embodiment of the present invention;

fig. 5 is a graph of MTF versus field of view at 30lp/mm, 60lp/mm, and 100lp/mm, respectively, according to an embodiment of the present invention.

In the drawings, the names of the parts corresponding to the reference numerals are as follows:

1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-a fifth lens; 6-sixth lens; 7-optical filter.

Detailed Description

To make the objectives, technical solutions and advantages of the present application more clear, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Examples

As shown in fig. 1 to 5, an ultrashort high-definition wide-angle lens is disclosed. In the present embodiment, the terms "first", "second", and the like are used only for distinguishing the similar components, and are not to be construed as limiting the scope of protection. In the present embodiment, the terms of orientation such as "bottom", "top", "peripheral edge", "center", and the like are explained based on the drawings. The embodiment is based on the innovation of the structure, the internal electrical connection mode of each cooker is not improved, and the technical personnel in the field can adopt the conventional electrical connection mode to connect and use according to the actual situation.

Specifically, the ultrashort high-definition wide-angle lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and an optical filter 7 which are sequentially arranged from an object side to an image side; the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all spherical glass lenses; the first lens 1 and the second lens 2 both adopt meniscus negative focal power lenses, the third lens 3 and the fourth lens 4 both adopt double convex positive focal power lenses, and the fifth lens 5 and the sixth lens 6 both adopt a cemented lens group; and a diaphragm disposed between the third lens 3 and the fourth lens 4.

In this embodiment, a ratio of the focal length f1 of the first lens 1 to the focal length f of the ultra-short high-definition wide-angle lens satisfies:

2.0<|f1/f|<3.0。

in the present embodiment, the following relationship is satisfied among the focal length f2 of the second lens 2, the focal length f3 of the third lens 3, the focal length f5 of the fifth lens 5, and the focal length f6 of the sixth lens 6:

0.51<|f2/f3|<0.75；

0.65<|f5/f6|<0.85。

in this embodiment, the half-image height H of the ultra-short high-definition wide-angle lens and the total optical length L of the ultra-short high-definition wide-angle lens satisfy: H/L > 0.2.

In this embodiment, the effective aperture D1 of the first lens element 1, the half-image height H of the lens, the optical total length L, the back focal length BFL, and the lens focal length f satisfy the following conditions:

D1/H>1.7；

D1/L>0.3；

1.65<BFL/f<1.85。

in this embodiment, the parameters of the ultra-short high-definition wide-angle lens are as shown in table 1 below:

table 1: physical parameters of any lens

In table 1, the front surface of any lens and the front surface of the infrared filter both refer to the surfaces of the lens close to the object side, the rear surface of any lens and the rear surface of the infrared filter both refer to the surfaces of the lens close to the image side, and when the curvature radii of the surfaces of any lens, the diaphragm, and the infrared filter in table 1 are infinity, the surfaces are planes.

FIG. 2 is a graph of MTF at 100lp/mm in the present embodiment, FIG. 3 is a graph of chromatic aberration of magnification in the present embodiment, FIG. 4 is a graph of defocus in the present embodiment, and FIG. 5 is a graph of MTF with field of view at 30lp/mm, 60lp/mm and 100lp/mm in the present embodiment, respectively;

it can be seen from fig. 2 that the MTF value of the full field of view of the present embodiment is above 0.3 at 100lp/mm, and is relatively concentrated, meeting the high definition use requirement; as can be seen from FIG. 3, the chromatic aberration of magnification of the present embodiment is less than 3 μm, and is basically within the Airy radius, so as to meet the use requirements; it can be seen from fig. 4 that the MTF value is substantially above 0.3 and has a larger focal depth when the defocus of the present embodiment is 0.04 mm; it can be seen from fig. 5 that the MTF curves of the lens at 30lp/mm, 60lp/mm and 100lp/mm are gentle, which indicates that the MTF values of the full field of view are concentrated, the change of the resolution from the center to the edge is small, and the use requirement of the high-definition wide-angle lens is met.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not limitations on the protection scope of the present invention, but all the changes made by adopting the design principle of the present invention and performing non-creative work on this basis shall fall within the protection scope of the present invention.

Claims

1. The ultrashort high-definition wide-angle lens is characterized by comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6) and an optical filter (7), wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the optical filter are sequentially arranged from an object side to an image side;

the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are all spherical glass lenses;

the first lens (1) and the second lens (2) both adopt meniscus negative focal power lenses, the third lens (3) and the fourth lens (4) both adopt double-convex positive focal power lenses, and the fifth lens (5) and the sixth lens (6) both adopt a cemented lens group; and the diaphragm is arranged between the third lens (3) and the fourth lens (4).

2. An ultra-short high definition wide-angle lens as claimed in claim 1, wherein the ratio of the focal length f1 of the first lens (1) to the focal length f of the ultra-short high definition wide-angle lens satisfies:

2.0<|f1/f|<3.0。

3. the ultra-short high definition wide-angle lens of claim 1, wherein the following relationship is satisfied among the focal length f2 of the second lens (2), the focal length f3 of the third lens (3), the focal length f5 of the fifth lens (5) and the focal length f6 of the sixth lens (6):

0.51<|f2/f3|<0.75；

0.65<|f5/f6|<0.85。

4. an ultrashort high-definition wide-angle lens as claimed in claim 1, wherein the refractive index nd1 of the first lens (1) satisfies: nd1>1.62, the Abbe number v1 of the first lens (1) satisfies: v1> 60; the refractive index nd2 of the second lens (2) satisfies: nd2>1.62, the abbe number v2 of the second lens (2) satisfies: v2> 60; the refractive index nd3 of the third lens (3) satisfies: nd3>1.75, and the third lens (3) has an Abbe number v3 satisfying: v3< 30; the refractive index nd4 of the fourth lens (4) satisfies: nd4<1.65, and the Abbe number v4 of the fourth lens (4) satisfies: v4> 58; the refractive index nd5 of the fifth lens (5) satisfies: nd5<1.6, and the Abbe number v5 of the fifth lens (5) satisfies: v5> 60; the refractive index nd6 of the sixth lens (6) satisfies: nd6>1.8, and the dispersion coefficient v6 of the sixth lens (6) satisfies: v6< 25.

5. The ultra-short high definition wide-angle lens of claim 1, wherein: the optical total length L of the ultra-short high-definition wide-angle lens meets the following requirements: 14.1< L < 15.1.

6. The ultra-short high definition wide-angle lens of claim 1, wherein: satisfy between the optical total length L of the half image height H of ultrashort high definition wide-angle lens and ultrashort high definition wide-angle lens: H/L > 0.2.

7. An ultrashort high-definition wide-angle lens as claimed in claim 1, wherein the effective aperture D1 of the first lens (1), the half height H of the lens, the total optical length L, the back focal length BFL and the lens focal length f satisfy the following conditions:

D1/H>1.7；

D1/L>0.3；

1.65<BFL/f<1.85。