A five-piece front-facing primary camera

Abstract

The utility model relates to a five-piece front view main camera, including optical system, optical system is by first lens, second lens, cemented lens group and fifth lens group and is sequentially arranged from left to right along the light ray incident light path, the cemented lens group is by third lens and fourth lens group, first lens is meniscus concave negative lens, second lens is biconvex positive lens, third lens is biconvex positive lens, fourth lens is biconcave negative lens, fifth lens is meniscus convex positive lens, the utility model discloses optical lens has good imaging definition, big light aperture, lower tolerance sensitivity and better high and low temperature stability's advantage, can comprehensively monitor the scene in front of the car and the distance, through the reasonable distribution of each lens's focal length, surface shape, each lens's center thickness and the on-axis distance between each lens, while meeting five-piece lens imaging performance requirement, the total length of lens and the radial dimension of each lens are reduced, and the lens group miniaturization is achieved.

Description

Technical Field

[0001] This utility model relates to a five-piece front-view main camera. Background Technology

[0002] Currently, vehicle-mounted cameras are mainly categorized into five types based on their installation location: front-view cameras, surround-view cameras, rear-view cameras, side-view cameras, and built-in cameras. Front-view cameras are primarily mounted on the windshield and are used for visual perception and recognition while driving. They can be further divided into front-view main cameras, front-view narrow-angle cameras, and front-view wide-angle cameras. The front-view main camera serves as the primary camera in L2 ADAS systems. Its field of view is typically 30°, 50°, 60°, 100°, or 120°, and its detection distance is generally 150-170m, providing L2-level functions such as road condition monitoring and lane departure warning. Given this, higher pixel density and longer detection distances mean higher accuracy and practicality, which often leads to an increase in the number of lens elements. The market commonly uses designs with seven or more elements, which is not conducive to cost reduction or widespread lens adoption. Utility Model Content

[0003] This invention addresses the aforementioned problem by providing a five-element front-view main camera that achieves clear imaging from all five elements while maintaining a small overall size.

[0004] This utility model is constructed as follows: it includes an optical system, which consists of a first lens, a second lens, a cemented lens group, and a fifth lens arranged sequentially from left to right along the incident light path. The cemented lens group consists of a third lens and a fourth lens. The first lens is a meniscus negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, and the fifth lens is a meniscus positive lens.

[0005] Furthermore, the object-side surface of the meniscus negative lens is convex, and the image-side surface is concave; the object-side surface of the biconvex positive lens is convex, and the image-side surface is convex; the object-side surface of the biconvex positive lens is convex, and the image-side surface is convex; the object-side surface of the biconcave negative lens is concave, and the image-side surface is concave; the object-side surface of the meniscus positive lens is convex, and the image-side surface is concave.

[0006] Furthermore, the air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture stop is 0.1~0.5mm; the air gap between the aperture stop and the third lens is 0.1~0.5mm; the third lens and the fourth lens are a cemented lens group with an air gap of 0mm; and the air gap between the fourth lens and the fifth lens is 0.1~0.5mm.

[0007] Furthermore, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, and f5, respectively, where f1, f2, f3, f4, and f5 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,1.0<f2 / f<2.0,0.0<f3 / f<1.0,-1.0<f4 / f<0.0,4.0<f5 / f<5.0。

[0008] Furthermore, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fourth lens satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0009] Furthermore, the first lens is a glass aspherical lens, the second, third, and fourth lenses are glass spherical lenses, and the fifth lens is a plastic aspherical lens.

[0010] Furthermore, the first lens and the fifth lens are aspherical lenses, and the equation for the aspherical curve is expressed as follows: Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0011] Furthermore, the total optical length (TTL) of the optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 5.0.

[0012] Furthermore, the image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≤1.0.

[0013] Furthermore, a first equivalent glass plate, a second equivalent glass plate, and an imaging surface are sequentially arranged behind the fifth lens.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This lens has an imaging angle greater than 120 degrees, and boasts advantages such as high image clarity, large aperture, low tolerance sensitivity, and good high and low temperature stability, enabling more comprehensive monitoring of the scene in front of the vehicle and at a distance. 2. Through the reasonable combination of various optical lenses, the system structure, consisting of five elements, ensures a compact and reasonable design, ease of assembly, low tolerance sensitivity, and suitability for large-scale, high-yield production. 3. The use of two glass lenses paired with four plastic lenses results in a lighter system weight compared to an all-glass system, and stronger optical performance stability compared to an all-plastic system, while also reducing costs while adapting to different environments. 4. It corrects for chromatic aberration along all axes, transverse chromatic aberration, and higher-order chromatic aberrations, ensuring high image quality even at large angles. 5. By fully utilizing the advantages of aspherical lenses, it reduces aberrations while further reducing the number of elements and shortening the lens length. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the optical structure of an embodiment of the present invention; Figure 2 This is an axial chromatic aberration diagram of the entire working band of this utility model embodiment; Figure 3 This is a transverse chromatic aberration diagram of the entire working band of this utility model embodiment; Figure 4 This is a field curvature distortion diagram of the entire working band of this utility model embodiment; In the diagram: STO - aperture stop; L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - first equivalent glass plate; L7 - second equivalent glass plate; IMA - imaging plane. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Example: Figures 1-4As shown, this utility model provides a five-element front-view main camera, including an optical system. The optical system consists of a first lens L1, a second lens L2, a cemented lens group, and a fifth lens L5 arranged sequentially from left to right along the incident light path. The cemented lens group consists of a third lens L3 and a fourth lens L4. The first lens is a meniscus negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, and the fifth lens is a meniscus positive lens.

[0018] The first lens is a negative optical power lens, which, while adjusting large-angle light, also functions as an aspherical lens to reduce aberrations such as distortion in the optical system. The third and fourth lenses together form an achromatic cemented doublet. Through a reasonable lens combination, the optical system, with its five-element structure, achieves a small size, large aperture, day and night confocal focus, and low temperature drift design. At the same time, it effectively corrects on-axis and off-axis aberrations, resulting in good image quality.

[0019] The aperture stop STO of the optical system is located between the second lens and the third lens.

[0020] In this embodiment of the invention, without considering the curvature caused by the aspherical coefficient, the object-side surface of the meniscus negative lens is convex and the image-side surface is concave; the object-side surface of the biconvex positive lens is convex and the image-side surface is convex; the object-side surface of the biconvex positive lens is convex and the image-side surface is convex; the object-side surface of the biconcave negative lens is concave and the image-side surface is concave; the object-side surface of the meniscus positive lens is convex and the image-side surface is concave.

[0021] In this embodiment of the invention, the air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture stop is 0.1~0.5mm; the air gap between the aperture stop and the third lens is 0.1~0.5mm; the third lens and the fourth lens are a cemented lens group with an air gap of 0mm; and the air gap between the fourth lens and the fifth lens is 0.1~0.5mm.

[0022] In this embodiment of the invention, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, and f5, respectively, wherein f1, f2, f3, f4, and f5 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,1.0<f2 / f<2.0,0.0<f3 / f<1.0,-1.0<f4 / f<0.0,4.0<f5 / f<5.0。

[0023] In this embodiment of the invention, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, Vd ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fourth lens satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0024] In this embodiment of the invention, each lens is made of glass and plastic materials respectively. The first lens is a glass aspherical lens, the second, third and fourth lenses are glass spherical lenses, and the fifth lens is a plastic aspherical lens.

[0025] In this embodiment of the invention, the first lens and the fifth lens are aspherical lenses, and the equation of the aspherical curve is expressed as follows: Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0026] In this embodiment of the invention, the total optical length (TTL) of the optical system and the focal length (f) of the optical system satisfy the following conditions: TTL / f ≤ 5.0; the F-number of the optical system ≤ 1.6; and the image height (H) of the optical system and the focal length (f) of the optical system satisfy the following condition: H / f ≤ 1.0.

[0027] In this embodiment of the present invention, a first equivalent glass plate L6, a second equivalent glass plate L7, and an imaging surface IMA are sequentially arranged behind the fifth lens.

[0028] In this embodiment of the invention, the technical specifications achieved by the optical system are as follows: (1) Focal length: 4.0≤EFFL≤5.0mm; (2) Aperture F≤1.6; (3) Field of view: 2w ≥ 120°; (4) Operating band: Visible light band.

[0029] To achieve the above design parameters, the specific design parameters of the optical system in this embodiment of the invention are shown in Table 1 below: Table 1 The aspherical coefficients of each aspherical lens in the optical system of this embodiment are shown in Table 2 below: Table 2 The optical system in this embodiment achieves miniaturization of the lens group by rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis distance between each lens, while meeting the imaging performance requirements of a five-element lens.

[0030] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0031] Meanwhile, if the present invention discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, the mutually fixed connection can also be replaced by an integral structure (e.g., manufactured by casting process) (except where it is obviously impossible to use an integral forming process).

[0032] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0033] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0034] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A five-piece front-view main camera, characterized in that, The system includes an optical system comprising a first lens, a second lens, a cemented lens group, and a fifth lens arranged sequentially from left to right along the incident light path. The cemented lens group consists of a third lens and a fourth lens. The first lens is a meniscus negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, and the fifth lens is a meniscus positive lens.

2. A five-piece front-view main camera according to claim 1, characterized in that, The object-side surface of the meniscus negative lens is convex, and the image-side surface is concave; the object-side surface of the biconvex positive lens is convex, and the image-side surface is convex; the object-side surface of the biconcave negative lens is concave, and the image-side surface is concave; the object-side surface of the meniscus positive lens is convex, and the image-side surface is concave.

3. A five-piece front-view main camera according to claim 1, characterized in that, The air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture stop is 0.1~0.5mm; the air gap between the aperture stop and the third lens is 0.1~0.5mm; the third lens and the fourth lens are a cemented lens group with an air gap of 0mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm.

4. A five-piece front-view main camera according to claim 1, characterized in that, The focal length of the optical system is f. The focal lengths of the first, second, third, fourth, and fifth lenses are f1, f2, f3, f4, and f5, respectively. The ratios of f1, f2, f3, f4, and f5 to f satisfy the following conditions: -2.0 < f1 / f < -1.0, 1.0 < f2 / f < 2.0, 0.0 < f3 / f < 1.0, -1.0 <f4 / f<0.0,4.0< f5 / f<5.0。 5. A five-piece front-view main camera according to claim 1, characterized in that, The first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fourth lens satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

6. A five-piece front-view main camera according to claim 1, characterized in that, The first lens is a glass aspherical lens, the second, third, and fourth lenses are glass spherical lenses, and the fifth lens is a plastic aspherical lens.

7. A five-piece front-view main camera according to claim 1, characterized in that, The first and fifth lenses are aspherical lenses, and the equation for the aspherical curve is as follows: Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

8. A five-piece front-view main camera according to claim 1, characterized in that, The total optical length (TTL) of an optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 5.

0.

9. A five-piece front-view main camera according to claim 1, characterized in that, The image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≤1.

0.

10. A five-piece front-view main camera according to claim 1, characterized in that, The fifth lens is followed by a first equivalent glass plate, a second equivalent glass plate, and an imaging surface.

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