CN214252715U - High-precision large-installation-distance large-visual-angle relay lens - Google Patents

Abstract

The utility model relates to the technical field of imaging quality detection, in particular to a high-precision large-installation-distance large-visual-angle relay lens, which comprises a first lens with a positive focal length, a second lens with a positive focal length, a third lens with a negative focal length and a fourth lens with a positive focal length in sequence along an optical axis; wherein, the image surface side of the first lens is a convex surface, and the object surface side is a concave surface; the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface; the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface; the image surface side of the fourth lens is a convex surface, and the object surface side is a plane. The relay lens is simple in structure, the number of the lenses is small, cost can be well reduced, image distances of different positions can be simulated by adjusting the object distances and changing the image distances, so that a lens for testing can achieve shooting tests of different focal lengths through the optical system, characteristics of the lenses can be utilized, the mounting distance between the relay lens and a camera module is large, the focusing mechanism is convenient to mount, the visual angle of the lens is large, and image quality is excellent.

Description

High-precision large-installation-distance large-visual-angle relay lens

Technical Field

The utility model relates to an imaging quality detects technical field, in particular to big installation distance of high accuracy wide visual angle relay mirror.

Background

With the rapid development of camera lenses and chip technologies, high-pixel chips and cameras have replaced low-pixel cameras, high-pixel camera modules also need to detect the remote imaging quality, generally, high-pixel cameras need to detect the image quality of 3m and more, and a conventional detection method needs to occupy a relatively large space, for example, when a 5000mm object is shot, the imaging size of the high-pixel camera is 2 × 5000 tan (120/2) ═ 17320mm, when a camera module is produced, the imaging quality is difficult to detect, and relay lenses are used for solving the problem, the required images in different test distance states can be shot by using a relatively short simulation distance, so that the imaging quality of the high-pixel cameras is evaluated, and the test space range is effectively reduced; however, the conventional relay lens has a problem that the larger the angle of view of the camera module, the larger the distance between the camera module and the relay lens, and the larger the diameter of the lens body, so that the manufacturing limit is exceeded.

Disclosure of Invention

In view of the above, the utility model provides a big installation distance of high accuracy large visual angle relay mirror to overcome prior art's defect.

The utility model provides a technical scheme that problem among the prior art adopted does: a high-precision large-installation-distance large-visual-angle relay lens sequentially comprises a first lens with a positive focal length, a second lens with a positive focal length, a third lens with a negative focal length and a fourth lens with a positive focal length along an optical axis; wherein the content of the first and second substances,

the image surface side of the first lens is a convex surface, and the object surface side of the first lens is a concave surface;

the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface;

the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface;

the image surface side of the fourth lens is a convex surface, and the object surface side is a plane.

Further, the optical system also satisfies the following condition:

(1)1.6＜Nd1＜1.8；20＜Vd1＜35；

(2)1.7＜Nd2＜1.9；40＜Vd2＜55；

(3)1.5＜Nd3＜1.7；30＜Vd3＜45；

(4)1.7＜Nd4＜1.9；40＜Vd5＜55；

wherein Nd1 is the refractive index of the first lens, and Vd1 is the dispersion coefficient of the first lens; nd2 is the refractive index of the second lens, and Vd2 is the dispersion coefficient of the second lens; nd3 is the refractive index of the third lens, and Vd3 is the dispersion coefficient of the third lens; nd4 is the refractive index of the fourth lens, and Vd4 is the abbe number of the fourth lens.

Further, the focal length f1 of the first lens is 440-450 mm.

Further, the focal length f2 of the second lens is 270 mm-300 mm.

Furthermore, the focal length f3 of the third lens is-120 mm to-130 mm.

Further, the focal length f4 of the fourth lens is 95 mm-105 mm.

Compared with the prior art, the utility model discloses following technological effect has:

this scheme is a big wide visual angle relay lens of installation distance of high accuracy, this relay lens's simple structure, and the lens is small in quantity, and reduce cost well thereby changes the image distance through adjusting the object distance, simulates out the image distance of different positions to the camera lens that makes the test realizes the shooting test of different focuses through this application optical system. The optical system reasonably collocates the first lens, the second lens, the third lens and the fourth lens, and utilizes the characteristics of each lens, so that the installation distance between the relay lens and the camera module is large, the focusing mechanism is convenient to install, the visual angle of the lens is large, and the image quality is excellent.

Drawings

Fig. 1 is a schematic structural diagram of a relay lens with high precision, large installation distance and large visual angle of the utility model;

fig. 2 is a light path diagram of the relay lens with high precision, large installation distance and large viewing angle of the present invention;

fig. 3 is a MTF graph of the relay lens with high precision, large installation distance and large viewing angle of the present invention;

fig. 4 is a point array diagram of the relay mirror with high precision, large installation distance and large visual angle;

fig. 5 is a distortion curve diagram of the relay lens with high precision, large installation distance and large visual angle.

Reference numbers in the figures: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a camera module; 6. an imaging position; 7. simulating a position; 8. an optical axis.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application 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 present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the structures or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The application provides a big wide visual angle relay lens of installation distance of high accuracy, and this relay lens is used for evaluating the formation of image quality of camera, the effectual test space scope that has reduced.

Referring to fig. 1, the relay lens with high precision, large installation distance and large viewing angle sequentially comprises a first lens 1 with positive focal length, a second lens 2 with positive focal length, a third lens 3 with negative focal length and a fourth lens 4 with positive focal length along an optical axis 8; wherein, the image surface side of the first lens is a convex surface, and the object surface side is a concave surface; the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface; the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface; the image surface side of the fourth lens is a convex surface, and the object surface side is a plane. This application is through the optical virtual image principle of simulation measured lens in order to reach the different analog distance that different virtual image positions of simulation correspond (the analog position 7 of the shooting distance of camera module 5 reality to the distance of camera module 5), improves optical system's resolution performance to reach the resolution ratio of high pixel.

Further, the optical system also satisfies the following condition:

(1) nd1 is more than 1.6 and less than 1.8; 20 < Vd1 < 35, preferably Nd1 is 1.7 and Vd1 is 28;

(2) nd2 is more than 1.7 and less than 1.9; 40 < Vd2 < 55, preferably Nd2 is 1.8 and Vd2 is 47;

(3) nd3 is more than 1.5 and less than 1.7; 30 < Vd3 < 45, preferably Nd3 is 1.6 and Vd3 is 37;

(4) nd4 is more than 1.7 and less than 1.9; 40 < Vd5 < 55, preferably Nd4 is 1.8 and Vd4 is 48;

wherein Nd1 is the refractive index of the first lens 1, and Vd1 is the abbe number of the first lens 1; nd2 is the refractive index of the second lens 2, and Vd2 is the abbe number of the second lens 2; nd3 is the refractive index of the third lens 3, and Vd3 is the abbe number of the third lens 3; nd4 is the refractive index of the fourth lens 4, and Vd4 is the abbe number of the fourth lens 4.

Further, the focal length f1 of the first lens 1 is 440mm to 450mm, and preferably, f1 is 445mm, which is beneficial to enable the optical system or the lens to form a clear image.

Further, the focal length f2 of the second lens 2 is 270mm to 300mm, and preferably f2 is 285mm, which is beneficial to enable the optical system or the lens to form a clear image.

Further, the focal length f3 of the third lens 3 is-120 mm to-130 mm, and preferably, f3 is-125 mm, which is beneficial to enable the optical system or the lens to form a clear image.

Further, the focal length f4 of the fourth lens 4 is 95mm to 105mm, and preferably f4 is 100mm, which is favorable for the optical system or the lens to form a sharp image.

Further, in the present embodiment, the basic parameters of the relay lens are shown in the following table:

in the above table, from the imaging position 6 to the entrance pupil side or the camera module 5 side along the optical axis 8, S1, S2 are both surfaces of the first lens 1; s3, S4 are both surfaces of the second lens 2; s5, S6 are both surfaces of the third lens 3; s7 and S8 indicate two surfaces of the fourth lens 4.

As can be seen from the MTF graph of fig. 3 and the dot sequence chart of fig. 4, the relay lens of the present invention has high resolution and is clear in the imaging range of the image plane.

It can be seen from the distortion graph of fig. 5 that the imaging distortion of the relay lens of the present application is small.

According to the structure and the parameters of each lens, the relay lens has the following characteristics: 1. the lens visual angle is large, namely the FOV is 120 degrees; 2. the installation distance of the lens is large, namely the installation distance is 30mm, so that the installation of a focusing mechanism is convenient, and the diameter of the lens is less than or equal to 190 mm; 3. the imaging distance can simulate 5000 mm-infinity; 4. when the imaging distance of the simulation is infinite, the imaging size does not exceed 700 mm.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A high-precision large-installation-distance large-visual-angle relay lens is characterized by sequentially comprising a first lens with a positive focal length, a second lens with a positive focal length, a third lens with a negative focal length and a fourth lens with a positive focal length along an optical axis; wherein the content of the first and second substances,

the image surface side of the first lens is a convex surface, and the object surface side of the first lens is a concave surface;

the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface;

the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface;

the image surface side of the fourth lens is a convex surface, and the object surface side is a plane.

2. The relay mirror with high precision, large installation distance and large visual angle as claimed in claim 1, wherein: the lens also satisfies the following conditions:

(1)1.6＜Nd1＜1.8；20＜Vd1＜35；

(2)1.7＜Nd2＜1.9；40＜Vd2＜55；

(3)1.5＜Nd3＜1.7；30＜Vd3＜45；

(4)1.7＜Nd4＜1.9；40＜Vd5＜55；

wherein Nd1 is the refractive index of the first lens, and Vd1 is the dispersion coefficient of the first lens; nd2 is the refractive index of the second lens, and Vd2 is the dispersion coefficient of the second lens; nd3 is the refractive index of the third lens, and Vd3 is the dispersion coefficient of the third lens; nd4 is the refractive index of the fourth lens, and Vd4 is the abbe number of the fourth lens.

3. A relay lens with high precision, large installation distance and large visual angle as claimed in claim 1 or 2, wherein: the focal length f1 of the first lens is 440-450 mm.

4. A relay lens with high precision, large installation distance and large visual angle as claimed in claim 1 or 2, wherein: the focal length f2 of the second lens is 270 mm-300 mm.

5. A relay lens with high precision, large installation distance and large visual angle as claimed in claim 1 or 2, wherein: the focal length f3 of the third lens is-120 mm-130 mm.

6. A relay lens with high precision, large installation distance and large visual angle as claimed in claim 1 or 2, wherein: the focal length f4 of the fourth lens is 95-105 mm.

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