CN218767539U

CN218767539U - Laser transceiving optical system

Info

Publication number: CN218767539U
Application number: CN202221164966.5U
Authority: CN
Inventors: 许熠宸; 罗杰; 林文斌; 郑新; 何文波; 黄灯辉; 江伟
Original assignee: Fujian Forecam Tiantong Optics Co Ltd
Current assignee: Fujian Forecam Tiantong Optics Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2023-03-28
Anticipated expiration: 2032-05-16

Abstract

The utility model relates to a laser light receiving and emitting optical system, which consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens and a sixth lens which are arranged along the incident direction of light rays from left to right in sequence; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a meniscus negative lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, and the sixth lens is a biconvex positive lens. The laser transmitting and receiving optical system has the characteristic of low temperature drift within the temperature range of-40 to 120 ℃; the light incidence angle is low, the tolerance sensitivity is low, and the theoretical yield is excellent; the aperture is large, the illumination of an imaging surface is higher, the peripheral illumination ratio is greater than 80%, and the illumination distribution of the image surface is more uniform.

Description

Laser transceiving optical system

Technical Field

The utility model relates to a laser light receiving and emitting optical system.

Background

Compared with an imaging lens and a millimeter wave radar, the laser radar has the advantages of higher resolution, better stability and is a current accepted optical solution scheme with more reliable three-dimensional data. The advantages of long detection distance, strong anti-interference capability and the like of the laser radar make the laser radar popular with automobile brands.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a laser receiving and emitting optical system, this laser receiving and emitting optical system image plane illuminance distribution is more even.

The technical scheme of the utility model lies in: a laser light receiving and emitting optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens and a sixth lens which are sequentially arranged from left to right along the incident direction of light rays; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a meniscus negative lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, and the sixth lens is a biconvex positive lens.

Further, the focal length of the optical system is

The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively, wherein and->

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The following proportions are satisfied: -17.0</>

Figure DEST_PATH_346422DEST_PATH_IMAGE002

<-14.1，-15.2<

<-12.5，-22.1</>

Figure DEST_PATH_552406DEST_PATH_IMAGE004

<-18.4，12.5</>

<15.5，7.7</>

Figure DEST_PATH_62016DEST_PATH_IMAGE006

<10.0，10.2</>

<14.5。

Further, the first lens satisfies the relation:

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≥1.5，/>

less than or equal to 50.0; the second lens satisfies the relation:

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≥1.5，/>

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less than or equal to 50.0; the third lens satisfies the relation: />

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≥1.5，/>

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Not less than 50.0; the fourth lens satisfies the relation:

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≥1.5，/>

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less than or equal to 50.0; the fifth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the sixth lens satisfies the relation:

Figure DEST_PATH_474422DEST_PATH_IMAGE008

≥1.5，/>

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less than or equal to 50.0; wherein->

Figure DEST_PATH_348629DEST_PATH_IMAGE008

Is the refractive index->

Figure DEST_PATH_138862DEST_PATH_IMAGE009

Abbe constant.

Further, the sixth lens is an aspherical lens.

Further, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 10.0.

Further, the F number of the optical system is less than or equal to 1.15.

Further, the half image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is more than or equal to 1.41.

Compared with the prior art, the utility model has the advantages of it is following:

the laser light-receiving optical system has reasonable material collocation and structure compensation and has the characteristic of low temperature drift within the temperature range of-40 to 120 ℃. The surface type design is reasonable, the light incidence angle is low, the tolerance sensitivity is low, and the theoretical yield is excellent. The aperture is large, the illumination of an imaging surface is higher, the peripheral illumination ratio is greater than 80%, and the illumination distribution of the image surface is more uniform. The optical dimensions were lower, with an overall length <3cm.

Drawings

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

FIG. 2 is a graph of MTF of the working band of the present invention;

FIG. 3 is an axial aberration diagram of the working band of the present invention;

FIG. 4 is a distortion diagram of the working band field curvature of the present invention;

FIG. 5 is a graph of ambient illuminance ratio for the operating band of the present invention;

in the figure: l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; l5-a fifth lens; l6-sixth lens; an L7-filter; l8-protective glass; STO-stop; IMA-imaging plane.

Detailed Description

In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

Refer to fig. 1 to 4

A laser light-receiving optical system is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from left to right along the incident direction of light rays; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a meniscus negative lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, and the sixth lens is a biconvex positive lens.

In this embodiment, the optical filter L7 and the protective glass L8 are sequentially disposed from left to right between the sixth lens element and the image plane.

In this embodiment, the focal length of the optical system is

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The following proportions are satisfied: -17.0</>

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<-14.1，-15.2</>

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<-12.5，-22.1</>

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<-18.4，12.5</>

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<15.5，7.7</>

Figure DEST_PATH_981288DEST_PATH_IMAGE006

<10.0，10.2</>

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<14.5。

In this embodiment, the first lens satisfies the following relation:

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≥1.5，/>

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less than or equal to 50.0; the second lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the third lens satisfies the relation: />

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≥1.5，/>

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Not less than 50.0; the fourth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the fifth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the sixth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; wherein->

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Is the refractive index->

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Abbe constant.

In this embodiment, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 10.0.

In this embodiment, the F number of the optical system is less than or equal to 1.15.

In this embodiment, the half-image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is more than or equal to 1.41.

In this embodiment, the sixth lens element is an aspheric lens element, and the aspheric curve equation expression is:

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wherein Z is the distance from the vertex of the aspheric surface to the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant;

are all high-order term coefficients.

In the embodiment, the aspheric coefficients of the aspheric lenses of the optical system are as follows:

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。

in this embodiment, the following technical indexes are implemented for the optical system:

(1) Focal length: EFFL is more than or equal to 2.8mm and less than or equal to 3.9mm; (2) the aperture F is less than or equal to 1.15; (3) working wave band: near infrared. The specific design adopted for the optical system is given in the following table:

。

the above mentioned is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be included in the scope of the present invention.

Claims

1. A laser light receiving and emitting optical system is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens and a sixth lens which are sequentially arranged from left to right along the incident direction of light rays; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a meniscus negative lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, and the sixth lens is a biconvex positive lens.

2. The laser transceiver system of claim 1, wherein the first lens satisfies the relationship:

≥1.5，/>

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less than or equal to 50.0; the second lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the third lens satisfies the relation: />

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≥1.5，/>

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Not less than 50.0; the fourth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; fifth layer ofThe mirror satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; the sixth lens satisfies the relation: />

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≥1.5，/>

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Less than or equal to 50.0; wherein->

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In order to be the refractive index,

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abbe constant.

3. The laser transmitter-receiver optical system according to claim 1 or 2, wherein the sixth lens is an aspherical lens.

4. The laser transmitter-receiver optical system of claim 1, wherein an overall optical length TTL of the optical system and a focal length f of the optical system satisfy: TTL/f is less than or equal to 10.0.

5. The laser transmitter-receiver optical system as claimed in claim 1, wherein the F-number of the optical system is less than or equal to 1.15.

6. A laser light harvesting optical system according to claim 1, 2, 4 or 5, wherein the half image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is more than or equal to 1.41.