CN115308877A

CN115308877A - Large-wide-angle low-distortion full-picture unmanned aerial vehicle imaging lens

Info

Publication number: CN115308877A
Application number: CN202210899593.4A
Authority: CN
Inventors: 吴沛林; 李四清; 陈天红
Original assignee: Guangzhou Changbudao Optical Technology Co ltd
Current assignee: Guangzhou Changbudao Optical Technology Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-08
Anticipated expiration: 2042-07-28
Also published as: CN115308877B

Abstract

The invention discloses a large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens which sequentially comprises a first lens La, a second lens Lb, a third lens Lc, a fourth lens Ld, a fifth lens Le, a sixth lens Lf, a seventh lens Lg, an eighth lens Lh, a ninth lens Li and a tenth lens Lj from an object side to an image side along an optical axis, wherein the fifth lens Le, the sixth lens Lf, the ninth lens Li and the tenth lens Lj are tightly bonded cemented lenses. The invention relates to a full-frame unmanned aerial vehicle imaging lens for infinite imaging, which has a focal length of 21mm and a wavelength range of visible light.

Description

Large-wide-angle low-distortion full-picture unmanned aerial vehicle imaging lens

Technical Field

The invention belongs to the technical field of unmanned aerial vehicle lenses, and particularly relates to a large wide-angle low-distortion full-picture unmanned aerial vehicle imaging lens.

Background

Along with the wide application of unmanned aerial vehicle taking photo by plane, the user has higher and higher requirements for the quality of taking photo by plane, and imaging lens is also continuously showing new, and high-quality imaging lens is the development trend of whole trade.

As patent application 202023220949.2 discloses an imaging lens for unmanned aerial vehicle detection, the optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side along an optical axis; the first lens element to the twelfth lens element each include an object side surface and an image side surface; the first lens has negative refractive index; the second lens element has positive refractive index; the third lens element has negative refractive index; the fourth lens element has negative refractive index; the fifth lens element has positive refractive index; the sixth lens element has positive refractive index; the seventh lens element has positive refractive index; the eighth lens element has a negative refractive index; the ninth lens element has a negative refractive index; the tenth lens element has a positive refractive index; the eleventh lens element has a negative refractive index; the twelfth lens element has a positive refractive index; the optical imaging lens has only twelve lenses with refractive indexes.

However, this patent application pays attention to the imaging quality of the lens, but neglects the imaging distance, causes to influence the shooting effect, especially when unmanned aerial vehicle's distant shooting, is difficult to satisfy the shooting effect.

Disclosure of Invention

In order to solve the above problems, the primary object of the present invention is to provide a large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens, which is an unmanned aerial vehicle imaging lens with a focal length of 21mm, a visible light wavelength, and an aperture F of 5.6, and can realize infinite imaging, thereby greatly widening the imaging distance and facilitating the use of the unmanned aerial vehicle.

In order to achieve the above object, the technical scheme of the invention is as follows.

A large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens comprises a first lens La, a second lens Lb, a third lens Lc, a fourth lens Ld, a fifth lens Le, a sixth lens Lf, a seventh lens Lg, an eighth lens Lh, a ninth lens Li and a tenth lens Lj in sequence from an object side to an image side along an optical axis, wherein the fifth lens Le and the sixth lens Lf are tightly bonded cemented lenses; the first lens La is a meniscus positive diopter lens, and the convex surface faces to the object surface; the second lens Lb is a meniscus type negative diopter lens, and the convex surface faces the object plane; the third lens Lc is a negative diopter lens, and the convex surface faces the object surface; the fourth lens Ld is a meniscus positive diopter lens, and the convex surface faces the object plane; the fifth lens Le is a meniscus negative diopter lens, and the convex surface faces the object side; the sixth lens Lf is a biconvex positive diopter lens; the seventh lens Lg is a meniscus positive diopter lens, and the convex surface faces the image surface; the eighth lens Lh is a meniscus negative diopter lens, and the convex surface faces the image surface; the ninth lens Li is a meniscus positive diopter lens; the tenth lens Lj is a meniscus type negative diopter lens; wherein the fifth lens Le and the sixth lens Lf, the ninth lens Li and the tenth lens Lj are cemented lenses that are closely bonded.

Further, the lens barrel includes a diaphragm, and the diaphragm is disposed between the sixth lens Lf and the seventh lens Lg.

Further, the first lens satisfies the following condition:

6<f1/f<10

wherein f1 is an effective focal length of the first lens La, and f is an effective focal length of the optical imaging lens.

Further, the first lens and the tenth lens satisfy the following condition:

1<f1/f10<3

where f1 is an effective focal length of the first lens La, and f10 is an effective focal length of the tenth lens Lj.

Further, the tenth lens satisfies the following condition:

5<f10/f<8

where f10 is an effective focal length of the tenth lens Lj, and f is an effective focal length of the optical imaging lens.

The lenses used in the invention are all spherical lenses.

Compared with the prior art, the invention has the beneficial effects that: satisfy above-mentioned configuration and be favorable to guaranteeing a focus 21mm wavelength is visible light, and light ring F is a full frame unmanned aerial vehicle imaging lens of 5.6, and this camera lens can the infinity formation of image.

Drawings

FIG. 1 is a schematic view of the present invention.

Fig. 2 is a schematic diagram of the imaging optical path of the present invention.

FIG. 3 is a schematic MTF of the present invention.

FIG. 4 is a schematic view of the field curvature and distortion of the present invention.

FIG. 5 is a schematic diagram of a dot array diagram according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the full-frame unmanned aerial vehicle imaging lens implemented by the present invention sequentially includes, from an object side to an image side along an optical axis, a first lens La, a second lens Lb, a third lens Lc, a fourth lens Ld, a fifth lens Le, a sixth lens Lf, a seventh lens Lg, an eighth lens Lh, a ninth lens Li, and a tenth lens Lj, where the fifth lens Le and the sixth lens Lf are cemented lenses tightly bonded to each other; the first lens La is a meniscus positive diopter lens, and the convex surface faces to the object surface; a second lens Lb meniscus negative diopter lens with a convex surface facing the object plane; the third lens Lc is a negative diopter lens, and the convex surface faces the object surface; the fourth lens Ld is a meniscus positive diopter lens, and the convex surface faces the object plane; the fifth lens Le is a meniscus negative diopter lens, and the convex surface faces the object side; the sixth lens Lf is a biconvex positive diopter lens; the seventh lens Lg is a meniscus positive diopter lens, and the convex surface faces the image surface; the eighth lens Lh is a meniscus negative diopter lens, and the convex surface faces the image surface; the ninth lens Li is a meniscus positive diopter lens; the tenth lens Lj is a meniscus type negative diopter lens; wherein the fifth lens Le and the sixth lens Lf, the ninth lens Li and the tenth lens Lj are cemented lenses that are closely bonded.

Wherein a diaphragm is provided between the sixth lens Lf and the seventh lens Lg.

The first lens satisfies the following condition:

6<f1/f<10

The first lens and the tenth lens satisfy the following condition:

1<f1/f10<3。

The tenth lens satisfies the following condition:

5<f10/f<8

The lenses used in the invention are all spherical lenses.

The relevant parameters of each lens are shown in table 1:

TABLE 1

The realized technical indexes are as follows:

1. focal length: f' =21mm.

2. Shooting distance: infinity.

3. Average distortion: and =5%.

4. Pore diameter F =5.6.

5. The maximum field angle 2 omega is 95.6 degrees.

6. Total optical length =75mm.

8. The applicable spectrum range is as follows: visible light.

In conclusion, the full-frame unmanned aerial vehicle imaging lens meets the configuration, the full-frame unmanned aerial vehicle imaging lens is beneficial to ensuring that the wavelength with the focal length of 21mm is visible light, and the aperture F is 5.6, and the lens can image at infinity.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens is characterized by comprising a first lens La, a second lens Lb, a third lens Lc, a fourth lens Ld, a fifth lens Le, a sixth lens Lf, a seventh lens Lg, an eighth lens Lh, a ninth lens Li and a tenth lens Lj in sequence from an object side to an image side along an optical axis, wherein the fifth lens Le and the sixth lens Lf are tightly bonded cemented lenses; the first lens La is a meniscus positive diopter lens, and the convex surface faces to the object surface; a second lens Lb meniscus negative diopter lens with a convex surface facing the object plane; the third lens Lc is a negative diopter lens, and the convex surface faces the object surface; the fourth lens Ld is a meniscus positive diopter lens, and the convex surface faces the object surface; the fifth lens Le is a meniscus negative diopter lens, and the convex surface faces the object side; the sixth lens Lf is a biconvex positive diopter lens; the seventh lens Lg is a meniscus positive diopter lens, and the convex surface faces the image surface; the eighth lens Lh is a meniscus negative diopter lens, and the convex surface faces the image surface; the ninth lens Li is a meniscus positive diopter lens; the tenth lens Lj is a meniscus type negative diopter lens; wherein the fifth lens Le and the sixth lens Lf, the ninth lens Li and the tenth lens Lj are cemented lenses that are closely bonded.

2. The large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens of claim 1, wherein the lens comprises an aperture, and the aperture is disposed between the sixth lens Lf and the seventh lens Lg.

3. The large wide angle, low distortion full frame unmanned aerial vehicle imaging lens of claim 1, wherein said first lens element satisfies the following condition:

6<f1/f<10

4. The large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens of claim 3, wherein the first lens and the tenth lens satisfy the following condition:

1<f1/f10<3

5. The large wide-angle low-distortion full-frame unmanned aerial vehicle imaging lens of claim 4, wherein the tenth lens satisfies the following condition:

5<f10/f<8

wherein f10 is an effective focal length of the tenth lens Lj, and f is an effective focal length of the optical imaging lens.