240-degree ultra-wide-angle high-pixel optical system and its applied camera module

Abstract

The embodiment of the present invention discloses a 240-degree ultra-wide-angle high-pixel optical system, which includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object plane to the image plane along the optical axis; the object plane sides of the first lens and the second lens are convex, and the image plane sides are concave, and their optical focal lengths are negative; the object plane side of the third lens is concave, and the image plane side is convex, and its optical focal length is negative; the image plane side of the fourth lens and the fifth lens are convex, and the image plane side is convex, and their optical focal lengths are positive; the object plane side of the sixth lens is concave, and the image plane side is convex, and its optical focal length is negative; the object plane side of the seventh lens is convex, and the image plane side is convex, and its optical focal length is positive. On the other hand, the embodiment of the present invention also provides a camera module. The embodiment of the present invention is composed of 7 lenses, the number of lenses is reasonable, and the structure is simple; it has good performances such as 240-degree ultra-wide angle, high pixels, and very good heat elimination.

Description

Technical field:

[0001] The present invention relates to an optical system and a camera module using the same, and in particular to a 240-degree ultra-wide-angle high-pixel optical system and a camera module using the same. Background technology:

[0002] With the development of science and technology, automotive camera lenses and modules are becoming more and more widely used. In order to observe a wider range of space, the lens usually requires a wide angle, but the field of view of existing products on the market is generally within 200 degrees, and it does not have high pixel characteristics. The image quality in the outer field of view area is low, and there are more lenses and a more complex structure. In order to improve the defects of existing products such as too small field of view, low pixel, more lenses, and more complex structure, this solution provides a 240-degree ultra-wide-angle high-pixel camera lens. Summary of the invention:

[0003] In order to overcome the problem that existing optical systems or camera modules have a large number of lenses and a complex structure, an embodiment of the present invention provides a 240-degree ultra-wide-angle high-pixel optical system.

[0004] A 240-degree ultra-wide-angle high-pixel optical system, comprising, along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens;

[0005] The object side of the first lens is convex, the image side is concave, and its optical power is negative;

[0006] The object side of the second lens is convex, the image side is concave, and its optical power is negative;

[0007] The object side of the third lens is concave, the image side is convex, and its optical power is negative;

[0008] The fourth lens has a convex object side and a convex image side, and its optical power is positive;

[0009] The image side of the fifth lens is convex, the image side is convex, and its optical power is positive;

[0010] The object side of the sixth lens is concave, the image side is convex, and its optical power is negative;

[0011] The object side of the seventh lens is convex, the image side is convex, and its optical power is positive.

[0012] On the other hand, an embodiment of the present invention further provides a camera module.

[0013] A camera module comprises at least an optical lens, in which the above-mentioned 240-degree ultra-wide-angle high-pixel optical system is installed.

[0014] The optical system and camera module of the embodiment of the present invention are mainly composed of 7 lenses, with a reasonable number of lenses and a simple structure. Different lenses are combined with each other and the optical focal length is reasonably distributed, and good performances such as 240-degree ultra-wide angle, high pixels, and very good heat elimination are achieved. Description of the drawings:

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The structure of the optical system or camera module of the present invention is schematically shown. Figure 1 ;

[0017] Figure 2 A distortion curve diagram of an optical system or camera module embodiment of the present invention at +25°C;

[0018] Figure 3 It is an MTF curve diagram at +25°C of an optical system or camera module embodiment of the present invention;

[0019] Figure 4 A relative illumination diagram at +25°C of an optical system or camera module embodiment of the present invention;

[0020] Figure 5 It is an MTF curve diagram of an optical system or camera module embodiment of the present invention at -40°C;

[0021] Figure 6 It is an MTF curve diagram of an optical system or camera module embodiment of the present invention at +85°C; Specific implementation method:

[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] When the embodiments of the present invention mention ordinal numbers such as "first" and "second", unless they do express the meaning of order according to the context, they should be understood as being merely for the purpose of distinction.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a 240-degree ultra-wide-angle high-pixel optical system, which includes, along the optical axis from the object plane to the image plane 9, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7.

[0026] The object side of the first lens 1 is convex, the image side is concave, and its optical power is negative;

[0027] The object side of the second lens 2 is convex, the image side is concave, and its optical power is negative;

[0028] The object side of the third lens 3 is concave, the image side is convex, and its optical power is negative;

[0029] The fourth lens 4 has a convex surface on its object side and a convex surface on its image side, and its optical power is positive;

[0030] The image side of the fifth lens 5 is convex, the image side is convex, and its optical power is positive;

[0031] The object side of the sixth lens 6 is concave, the image side is convex, and its optical power is negative;

[0032] The object side of the seventh lens element 7 is convex, the image side is convex, and its optical power is positive.

[0033] The optical system of the embodiment of the present invention is mainly composed of 7 lenses, with a reasonable number of lenses and a simple structure. Different lenses are combined with each other and the optical focal length is reasonably distributed, and it has good performances such as 240-degree ultra-wide angle, high pixels, and very good heat elimination.

[0034] Furthermore, as a preferred embodiment of the present invention but not limiting, the fifth lens 5 and the sixth lens 6 are glued together to form a combined lens, and the optical system satisfies TTL / EFL≤25, where TTL is the distance between the vertex on the object side of the first lens 1 of the optical system and the imaging surface 9, and EFL is the effective focal length of the optical system. The structure is simple and compact, which can ensure good optical performance.

[0035] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the combined lens satisfies the following condition: 3.5 < f56 < 25, where f56 is the focal length after the fifth lens 5 and the sixth lens 6 are combined. The structure is simple and good optical performance can be ensured.

[0036] Still further, as a preferred embodiment of the present invention rather than a limitation, each lens of the optical system satisfies the following conditions:

[0037] (1) -25 < f1 < -5;

[0038] (2) -15 < f2 < -2;

[0039] (3) -100 < f3 < -10;

[0040] (4) 3 < f4 < 20;

[0041] (5) 1.5 < f5 < 5.5;

[0042] (6) -10 < f6 < -2;

[0043] (7) 2 < f7 < 20;

[0044] Wherein, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, and f7 is the focal length of the seventh lens 7. Through the mutual combination of different lenses and the reasonable distribution of the optical power, the optical system has good performances such as ultra-wide angle, high pixel, and very good correction of thermal aberration.

[0045] Still further, as a preferred embodiment of the present invention rather than a limitation, each lens of the optical system satisfies the following conditions:

[0046] (1) -25 < f1 / f < -4.5;

[0047] (2) -15 < f2 / f < -1.8;

[0048] (3) -95 < f3 / f < -9;

[0049] (4) 2.5 < f4 / f < 18.5;

[0050] (5) 1.2 < f5 / f < 5.5;

[0051] (6) -10 < f6 / f < -1.5;

[0052] (7) 1.5 < f7 / f < 18.5;

[0053] Among them, f is the focal length of the entire optical system, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, and f7 is the focal length of the seventh lens 7. Through the mutual combination of different lenses and the reasonable distribution of their optical power, the optical system has good performance such as ultra-wide angle, high pixel, and excellent thermal aberration correction.

[0054] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens 1 satisfy: 1.70 < Nd1 < 1.95, 30 < Vd1 < 55. The structure is simple and good optical performance can be ensured.

[0055] Still further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd2 and Abbe number Vd2 of the material of the second lens 2 satisfy: 1.70 < Nd2 < 1.95, 25 < Vd2 < 55. The structure is simple and good optical performance can be ensured.

[0056] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd3 and Abbe number Vd3 of the material of the third lens 3 satisfy: 1.60 < Nd3 < 1.85, 35 < Vd3 < 55. The structure is simple and good optical performance can be ensured.

[0057] Also further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens 4 satisfy: 1.75 < Nd4 < 1.95, 17 < Vd4 < 35. The structure is simple and good optical performance can be ensured.

[0058] Still further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens 5 satisfy: 1.45 < Nd5 < 1.65, 60 < Vd5 < 95. The structure is simple and good optical performance can be ensured.

[0059] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens 6 satisfy: 1.80 < Nd6 < 2.25, 17 < Vd6 < 35. The structure is simple and good optical performance can be ensured.

[0060] Also further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens 7 satisfy: 1.45 < Nd7 < 1.65, 60 < Vd7 < 95. The structure is simple and good optical performance can be ensured.

[0061] Furthermore, as a preferred embodiment of the present invention but not limiting, the aperture 8 of the optical system is located between the fourth lens 4 and the fifth lens 5 to adjust the intensity of the light beam.

[0062] Furthermore, as a preferred embodiment of the present invention but not limiting, an infrared cut-off filter is provided between the seventh lens 7 and the image plane 9 to allow visible light to pass through and filter infrared light to avoid red exposure.

[0063] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies D1:D2:D3=1-1.4:1.5-1.8:0.8-1.2, wherein D1 is the distance between the first lens 1 and the second lens 2, D2 is the distance between the second lens 2 and the third lens 3, and D3 is the distance between the fourth lens 4 and the fifth lens 5. The structure is simple and good optical performance can be guaranteed.

[0064] Specifically, the basic parameters of this optical system are shown in the following table:

[0065]

[0066]

[0067] In the above table, along the optical axis from the object plane to the image plane 9, S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; S9 is the aperture STO; S10 and S11 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; S13 and S14 correspond to the two surfaces of the seventh lens 7; S15 and S16 correspond to the two surfaces of the infrared cut-off filter; IMA is the image plane 9.

[0068] from Figures 2 to 6 It can be seen that the optical system of this embodiment has excellent performances such as ultra-wide angle, high pixel, and very good athermal difference.

[0069] A camera module comprises at least an optical lens, in which the above-mentioned 240-degree ultra-wide-angle high-pixel optical system is installed.

[0070] The camera module of the embodiment of the present invention is mainly composed of 7 lenses, with a reasonable number of lenses and a simple structure. Different lenses are combined with each other and the optical focal length is reasonably distributed, and it has good performance such as 240-degree ultra-wide angle, high pixel, and very good heat elimination.

[0071] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A 240-degree ultra-wide-angle high-pixel optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object plane to the image plane along the optical axis; characterized in that: The object side of the first lens is convex, the image side is concave, and its optical power is negative; The object side of the second lens is convex, the image side is concave, and its optical power is negative; The object side of the third lens is concave, the image side is convex, and its optical power is negative; The fourth lens has a convex object side and a convex image side, and its optical power is positive; The image side of the fifth lens is convex, the image side is convex, and its optical power is positive; The object side of the sixth lens is concave, the image side is convex, and its optical power is negative; The object side of the seventh lens is convex, the image side is convex, and its optical power is positive; The fifth lens and the sixth lens are bonded together to form a combined lens, and the focal length f56 of the combined lens satisfies the following conditions: 3.5mm<f56<25mm; Each lens of the optical system meets the following conditions: (1) -25mm<f1<-5mm; (2) -15mm<f2<-2mm; (3) -100mm<f3<-10mm; (4) 3mm<f4<20mm; (5) 1.5 mm < f5 < 5.5 mm; (6) -10mm<f6<-2mm; (7) 2mm<f7<20mm; Among them, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

2. The 240-degree ultra-wide-angle high-pixel optical system according to claim 1, characterized in that: The optical system satisfies TTL / EFL≤25, wherein TTL is the distance between the object plane vertex of the first lens of the optical system and the imaging plane, and EFL is the effective focal length of the optical system.

3. The 240-degree ultra-wide-angle high-pixel optical system according to claim 1, characterized in that: Each lens of the optical system meets the following conditions: (1) -25<f1 / f<-4.5; (2) -15<f2 / f<-1.8; (3) -95<f3 / f<-9; (4)2.5<f4 / f<18.5; (5)1.2<f5 / f<5.5; (6) -10<f6 / f<-1.5; (7) 1.5<f7 / f<18.5; Among them, f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

4. The 240-degree ultra-wide-angle high-pixel optical system according to claim 1, characterized in that: The aperture stop of the optical system is located between the fourth lens and the fifth lens.

5. The 240-degree ultra-wide-angle high-pixel optical system according to any one of claims 1 to 4, characterized in that: The material refractive index Nd1 and the material Abbe constant Vd1 of the first lens satisfy: 1.70<Nd1<1.95, 30<Vd1<55; and / or The material refractive index Nd2 and the material Abbe constant Vd2 of the second lens satisfy: 1.70<Nd2<1.95, 25<Vd2<55; and / or The material refractive index Nd3 and the material Abbe constant Vd3 of the third lens satisfy: 1.60<Nd3<1.85, 35<Vd3<55; and / or The material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens satisfy: 1.75<Nd4<1.95, 17<Vd4<35; and / or The material refractive index Nd5 and the material Abbe constant Vd5 of the fifth lens satisfy: 1.45<Nd5<1.65, 60<Vd5<95; and / or The material refractive index Nd6 and the material Abbe constant Vd6 of the sixth lens 6 satisfy: 1.80<Nd6<2.25, 17<Vd6<35; and / or The material refractive index Nd7 and the material Abbe constant Vd7 of the seventh lens 7 satisfy: 1.45<Nd7<1.65, 60<Vd7<95.

6. The 240-degree ultra-wide-angle high-pixel optical system according to any one of claims 1 to 4, characterized in that: Optical system meets D1: D2:D3=1~1.4:1.5~1.8:0.8~1.2, wherein D1 is the distance between the first lens and the second lens, D2 is the distance between the second lens and the third lens, and D3 is the distance between the fourth lens and the fifth lens.

7. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a 240-degree ultra-wide-angle high-pixel optical system as described in any one of claims 1 to 6.

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