CN214097947U

CN214097947U - Low-distortion vehicle-mounted all-round looking optical image system

Info

Publication number: CN214097947U
Application number: CN202120399908.XU
Authority: CN
Inventors: 马斯颖
Original assignee: Pinghu Dynamic Electronics Co ltd
Current assignee: Pinghu Dynamic Electronics Co ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-08-31
Anticipated expiration: 2031-02-23

Abstract

The utility model provides a low distortion vehicle-mounted all-round looking optical image system belongs to optics technical field. The low-distortion vehicle-mounted all-round-looking optical image system comprises a first optical lens, a second optical lens, a reflecting assembly and an image sensor, wherein the first optical lens and the second optical lens have the same structure, and the field angles of the two optical lenses are larger than 90 degrees; the main optical axis of the first optical lens is perpendicular to the main optical axis of the second optical lens; the reflection assembly is used for reflecting the light rays of the first optical lens, and a main optical axis of the light rays of the first optical lens after being reflected by the reflection assembly is parallel to a main optical axis of the light rays of the second optical lens; the image sensor is used for receiving the light rays of the first optical lens reflected by the reflecting component and the light rays of the second optical lens. The utility model has the advantages of low distortion and low cost.

Description

Low-distortion vehicle-mounted all-round looking optical image system

Technical Field

The utility model belongs to the technical field of optics, a low distortion vehicle-mounted all-round looking optical image system is related to.

Background

In recent years, with the increasing number of automobiles and the rapid development of unmanned technology, the requirements of people on driving safety are higher and higher. In the past, the safety of the automobile only depends on the judgment of a driver, and once the driver is not concentrated or does not notice various environmental changes around the automobile in time, driving accidents are easily caused. With the development of optical lenses, people are beginning to use various vehicle-mounted optical lenses to assist drivers in understanding and determining driving environments.

In an existing vehicle-mounted around vision system, the following two image acquisition and processing schemes are often adopted:

scheme 1: a single fisheye lens is used in conjunction with a sensor to obtain image information at field angles greater than 180 °. The proposal is beneficial to the simplification and miniaturization of the system, however, the imaging of the peripheral field of view by the fish glasses lens has larger distortion, so that the image information of the imaging edge of the vision system is difficult to utilize in the using process.

Scheme 2: two image sensors are respectively matched with 2 wide-angle lenses. The information of the two image sensors is coded, gathered and spliced into a complete long image. Compared with the scheme 1, the scheme has the advantages that the imaging is more complete, the peripheral field of view can also be less distorted, and the user can make accurate judgment in the using process conveniently. However, in the vehicle-mounted vision system adopting two lenses, two sets of image sensors and image processors are needed to be matched at present, and the two sets of systems need to be bridged, information is synchronized and processed. Therefore, a certain processing time difference is generated from the acquisition of the lens image to the information which becomes available on the screen, so that the information is delayed. The driving risk that the car was gone at high-speed in-process, information delay brought can promote greatly to there is certain safe risk. Meanwhile, more than two lenses are matched with more than two sets of image sensors, image processors and screens, so that the cost of the detection module becomes very expensive and the detection module is difficult to apply to middle and low-end products.

In view of the deficiencies of the

above schemes

1 and 2, it is highly desirable for those skilled in the art to develop an optical system for a 360-degree vehicle vision with low distortion and low cost by using a single sensor with two lenses.

Disclosure of Invention

The utility model discloses a first purpose has above-mentioned problem to current technique, has provided a low distortion vehicle-mounted all-round looking optical image system, the utility model discloses the technical problem that will solve is how to improve imaging quality, reduction in production cost.

The purpose of the utility model can be realized by the following technical proposal: a low-distortion vehicle-mounted all-round-looking optical image system comprises a first optical lens, a second optical lens, a reflecting assembly and an image sensor, wherein the first optical lens and the second optical lens are identical in structure, and the field angles of the two optical lenses are larger than 90 degrees; the main optical axis of the first optical lens is perpendicular to the main optical axis of the second optical lens; the reflection assembly is used for reflecting the light rays of the first optical lens, and a main optical axis of the light rays of the first optical lens after being reflected by the reflection assembly is parallel to a main optical axis of the light rays of the second optical lens; the image sensor is used for receiving the light rays of the first optical lens reflected by the reflecting component and the light rays of the second optical lens.

In the low-distortion vehicle-mounted all-round optical imaging system, a correction component is further arranged between the second optical lens and the image sensor.

In the above-mentioned low distortion vehicle-mounted all-round optical imaging system, the thickness of the correction assembly along the direction of the main optical axis of the second optical lens is the same as the path length of the light of the first optical lens in the reflection assembly.

In the low-distortion vehicle-mounted all-round optical image system, an included angle between the reflection assembly and a main optical axis of the first optical lens is 45 degrees; the reflection assembly is flush with one side of the correction assembly, which is far away from the image sensor.

In the above low distortion vehicle-mounted all-round optical image system, the reflection assembly and the correction assembly are integrally formed; and the thickness of the second optical lens is the same as that of the reflection component along the direction of the main optical axis of the second optical lens.

In the above low distortion vehicle-mounted all-round optical image system, the reflection component is a reflector or a beam splitter prism.

In the above low distortion vehicle-mounted all-round optical imaging system, distances from the center of the image sensor to the main optical axis of the first optical lens light and the main optical axis of the second optical lens light after being reflected by the reflection assembly are the same.

In the low-distortion vehicle-mounted all-round optical imaging system, the field angles of the first optical lens and the second optical lens are greater than 100 ° and less than 120 °.

The second objective of the present invention is to solve the above problems in the prior art, and to provide an imaging device, the technical problem to be solved by the present invention is to provide an imaging device with high imaging quality.

The purpose of the utility model can be realized by the following technical proposal: an image forming apparatus comprising: the low-distortion vehicle-mounted all-round-looking optical image system proposed in the above scheme; and an imaging element configured to receive an image formed by the low distortion vehicle mounted all-round optical imaging system.

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

1. the utility model has the advantages that the whole system is provided with only one image sensor, the two lenses respectively form images in two half areas of the sensor through the respective light paths through the beam splitter prism, and the images are formed by splicing; the system does not need to be matched with two sets of image sensors and image processors, and information processing can be realized by only using two lenses and one set of image sensors and processors. The time delay generated in the bridging process of the two image sensors is reduced, and the transmission and processing speed of available information is improved, so that the safety risk in the driving process is reduced.

2. The lens part of the whole system consists of two low-distortion wide-angle fixed-focus lenses, and a total horizontal field angle of 200 degrees is obtained by matching a proper light path; two lenses are used for splicing, and the image sensor is matched with the two lenses to realize large-field-angle observation, so that the problem of large peripheral field distortion is effectively solved compared with the single-use fisheye lens. The imaging quality is greatly improved, and the use experience of a user is improved.

Drawings

Fig. 1 is a schematic structural diagram of a system according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the image splicing of the dual prime lenses of the present invention on a single sensor;

fig. 3 is a schematic structural diagram of a system according to a second embodiment of the present invention;

FIG. 4 is a schematic view of a wide-angle prime lens used in the present invention;

FIG. 5 is a diagram showing various aberrations of a wide-angle prime lens used in the present invention;

fig. 6 and 7 are coma diagrams of the wide-angle fixed-focus lens used in the present invention.

In the figure, 1, a negative power lens; 2. a positive power plastic aspherical lens; 3. a third lens; 4. a positive power plastic aspherical lens; 5. a negative power plastic aspherical lens; 6. protecting glass; 7. an optical filter; 8. and (4) an aperture diaphragm.

Detailed Description

In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.

For the sake of simplicity, only the parts related to the utility model are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

The first embodiment is as follows:

as shown in fig. 1, 2, 4, 5, 6 and 7, a low distortion vehicle-mounted all-round-looking optical imaging system includes a first optical lens, a second optical lens, a reflection assembly and an image sensor with a specification of 1920 × 10802.9 μ, wherein the first optical lens and the second optical lens have the same structure, and the field angles of the two optical lenses are both larger than 90 °; the main optical axis of the first optical lens is vertical to the main optical axis of the second optical lens; the reflection assembly is used for reflecting the light of the first optical lens, and the main optical axis of the light of the first optical lens after being reflected by the reflection assembly is parallel to the main optical axis of the light of the second optical lens; the image sensor is used for receiving the light rays of the first optical lens and the second optical lens after the first optical lens is reflected by the reflecting component.

And a correction assembly is also arranged between the second optical lens and the image sensor, and the thickness of the correction assembly along the direction of a main optical axis of the second optical lens is the same as the path length of the light ray of the first optical lens in the reflection assembly.

The reflecting component is a beam splitter prism, and an included angle between the reflecting component and a main optical axis of the first optical lens is 45 degrees; the reflection assembly is flush with the side of the correction assembly away from the image sensor.

The reflection assembly and the correction assembly are integrally formed; and the thicknesses of the second optical lens and the reflection assembly are the same along the direction of the main optical axis of the second optical lens.

The distances from the center of the image sensor to the main optical axis of the first optical lens light and the main optical axis of the second optical lens light after being reflected by the reflecting component are the same.

In the present embodiment, the angle of view of the first optical lens and the second optical lens is greater than 100 ° and less than 120 °, preferably 105 °.

The working principle of the first embodiment is as follows: the light rays passing through the two fixed-focus lenses of the optical system will present two circles at the image plane (see fig. 2): an image circle is formed on a first image surface T1 after the light rays pass through the first lens group G1 and the beam splitting prism; after the light passes through the second lens group G2 and the beam splitting prism, an image circle is formed on the second image surface T2. Because the total optical lengths TTL of the two lens groups are very close, the image planes of the two lens groups are very close under the condition that all lenses at the front section are shared at least. When a rectangular image sensor is placed at the image plane position of the two lens groups to receive images, the left half of the image sensor is imaged by the first lens group G1, and the right half of the image sensor is imaged by the second lens group G2. By the optical system, the left area and the right area of one sensor can respectively receive image information from two wide-angle fixed-focus lenses. Through algorithm splicing, a low-distortion wide-angle image with a field angle up to 200 degrees is obtained on a screen of a user.

The parameters of the prime lens used in the examples are as follows:

the optical lens comprises a negative focal power lens 1, a positive focal power plastic aspheric lens 2, an aperture diaphragm 8, a third lens 3, a positive focal power plastic aspheric lens 4, a negative focal power plastic aspheric lens 5, protective glass 6 and an optical filter 7; the integral focal length F of the lens is 2.8; relative aperture FNO 2.18.

S10	S11
		4.9815672	5.177506973
0.0166322	0.015251532
		-0.0041271	-0.002241901
0.0003784	-0.00016639
		4.69E-05	-9.24E-07
1.59E-06	-6.43E-06

The fixed-focus lenses G1, G2 satisfy the following conditions:

(1)16mm<TTL<17mm

(2)2.7mm<EFL<2.8mm

(3)HFOV>105°

wherein TTL is the total length of the fixed focus lens, EFL is the effective focal length of the fixed focus lens, and HFOV is the horizontal field angle of the fixed focus lens.

An image forming apparatus comprising: the low-distortion vehicle-mounted all-round-looking optical image system proposed in the above scheme; and an imaging element configured to receive an image formed by the low distortion vehicle mounted all-round optical imaging system.

Example two:

as shown in fig. 3, the structure and principle of the present embodiment are basically the same as those of the first embodiment, except that: in the first embodiment, the reflecting component is a beam splitter prism; in the second embodiment, the reflection assembly includes two mirrors.

The working principle of the second embodiment is as follows: the light rays pass through two fixed-focus lenses of the optical system, and two image circles are presented on an image surface (see fig. 2): after the light rays pass through the first lens group G1 and the reflecting mirror, an image circle is formed on the first image surface T1; the light rays pass through the second lens group G2 and are reflected to form an image circle on the second image plane T2. Because the total optical lengths TTL of the two lens groups are very close, the image planes of the two lens groups are very close under the condition that all lenses at the front section are shared at least. When a rectangular image sensor is placed at the image plane position of the two lens groups to receive images, the left half of the image sensor is imaged by the first lens group G1, and the right half of the image sensor is imaged by the second lens group G2. By the optical system, the left area and the right area of one sensor can respectively receive image information from two wide-angle fixed-focus lenses. Because the image is turned over at the moment, the left side and the right side need to be respectively subjected to mirror image turning and splicing through an algorithm, and therefore a low-distortion wide-angle image with the visual field angle up to 200 degrees is obtained on the screen of a user.

Compared with the scheme of the first embodiment, the mode of splicing the images of the two lenses by using the double reflectors is lower in cost, meanwhile, the light path does not need to be readjusted by considering the appearance factor of the prism in the design process, and the basic light path can be kept unchanged.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although 1, negative power lenses are used more herein; 2. a positive power plastic aspherical lens; 3. a third lens; 4. a positive power plastic aspherical lens; 5. a negative power plastic aspherical lens; 6. protecting glass; 7. an optical filter; 8. aperture stop, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The low-distortion vehicle-mounted all-round-view optical image system is characterized by comprising a first optical lens, a second optical lens, a reflecting component and an image sensor, wherein the first optical lens and the second optical lens have the same structure, and the field angles of the two optical lenses are larger than 90 degrees; the main optical axis of the first optical lens is perpendicular to the main optical axis of the second optical lens; the reflection assembly is used for reflecting the light rays of the first optical lens, and a main optical axis of the light rays of the first optical lens after being reflected by the reflection assembly is parallel to a main optical axis of the light rays of the second optical lens; the image sensor is used for receiving the light rays of the first optical lens reflected by the reflecting component and the light rays of the second optical lens.

2. The system of claim 1, wherein a correction component is disposed between the second optical lens and the image sensor.

3. The system of claim 2, wherein the thickness of the correction element along the direction of the main optical axis of the second optical lens is the same as the path length of the light of the first optical lens in the reflection element.

4. The system of claim 2, wherein an angle between the reflection assembly and a main optical axis of the first optical lens is 45 degrees; the reflection assembly is flush with one side of the correction assembly, which is far away from the image sensor.

5. The vehicle-mounted low distortion all-round optical imaging system of claim 4, wherein the reflection assembly and the correction assembly are integrally formed; and the thickness of the second optical lens is the same as that of the reflection component along the direction of the main optical axis of the second optical lens.

6. The system of claim 1, wherein the reflective element is a mirror or a beam splitter prism.

7. The vehicle-mounted low-distortion all-round optical imaging system as claimed in claim 1, wherein the distances from the center of the image sensor to the principal optical axis of the first optical lens light and the principal optical axis of the second optical lens light after being reflected by the reflection assembly are the same.

8. The vehicle-mounted low-distortion all-round optical imaging system as claimed in claim 1, wherein the field angles of the first optical lens and the second optical lens are greater than 100 ° and less than 120 °.

9. An image forming apparatus comprising: a low distortion vehicular surround view optical imaging system of any one of claims 1 to 8; and an imaging element configured to receive an image formed by the low distortion vehicle mounted all-round optical imaging system.