Large-aperture ultra-wide-angle low-light lens and electronic equipment

Abstract

The invention discloses a large-aperture ultra-wide-angle low-light lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged in the direction from the object side to the image side along the optical axis. The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; and the like. The lens adopts a twelve-piece type design, the total optical length is controlled within 55 mm, the maximum outer diameter of the lens is smaller than 35 mm, the weight of the optical lens is smaller than 38 g, an ultra-compact optical structure is adopted in the lens, the size and the weight are both considered in the overall design, and the requirement of light-weight design is met.

Description

Technical Field

[0001] The present invention relates to the technical field of large aperture ultra-wide angle low light level lens, and in particular to a large aperture ultra-wide angle low light level lens and electronic equipment. Background Art

[0002] Large aperture ultra-wide angle low light lenses are mainly used for low light night vision, drone low light lenses or handheld low light lenses, etc. However, most of the existing large aperture ultra-wide angle low light lenses have one or more of the following defects:

[0003] First, the existing low-light lenses have a small field of view, a small observation range, and insufficient image capture;

[0004] Second, the wavelength range of existing wide-spectrum lenses is mostly between 435-650nm and 435-850nm, which cannot meet the needs in low-light environments;

[0005] Third, the existing low-light lenses have complex structures, large outer diameters, long total lengths, large volumes, and heavy weights, and cannot meet the needs of special scenarios, such as handheld observations, drone lenses, or fixed helmet lenses.

[0006] Fourth, the existing wide-spectrum lens has a low resolution. Especially when used with a large target area, the edge resolution drops sharply, and only the middle area of ​​the image is clear, while the edges are blurred.

[0007] Fifth, the existing wide-spectrum lens has a small light transmission rate, low energy utilization rate, and poor low-light effect;

[0008] Sixth, the existing wide-spectrum lens has a large focal length, resulting in a small depth of field when the aperture is the same, and a small range of distances in front of and behind the object measured when the lens obtains a clear image. Summary of the invention

[0009] In view of this, the purpose of the present invention is to provide a large aperture ultra-wide angle low light lens and electronic equipment. The lens can solve at least one technical disadvantage mentioned in the background technology.

[0010] According to one aspect of the present invention, there is provided a large aperture ultra-wide-angle micro-light lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence along an optical axis from an object side to an image side; the first lens has a negative optical focal length, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has a negative optical focal length, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has a positive optical focal length, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface or a concave surface; the fourth lens has a negative optical focal length, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has a positive optical focal length, the object side surface of the fifth lens is a convex surface, and the The image side surface of the fifth lens is convex; the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the seventh lens has positive focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the eighth lens has negative focal power, the object side surface of the eighth lens is concave, and the image side surface of the eighth lens is concave; the ninth lens has positive focal power, the object side surface of the ninth lens is convex, and the image side surface of the ninth lens is concave; the tenth lens has positive focal power, the object side surface of the tenth lens is convex, and the image side surface of the ninth lens is convex; the eleventh lens has negative focal power, the object side surface of the eleventh lens is concave, and the image side surface of the eleventh lens is concave; the twelfth lens has positive focal power, the object side surface of the twelfth lens is convex, and the image side surface of the twelfth lens is convex or concave. The lens adopts a twelve-piece design, the total optical length is controlled within 55mm, the maximum outer diameter of the lens is less than 35mm, the optical lens weighs less than 38g, and an ultra-compact optical structure is used internally. The overall design takes into account both volume and weight, meeting the requirements of lightweight design. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0012] Figure 1 This is a structural diagram of the optical system of the lens in Example 1.

[0013] Figure 2 This is the MTF diagram of the lens of the present invention in Example 1 within the wavelength range of 435nm-1000nm.

[0014] Figure 3 Graphs showing various aberrations of the lens of the present invention in Example 1.

[0015] Figure 4 4 is a chromatic aberration diagram of light of the lens of the present invention in Example 1 within a wavelength range of 435nm-1000nm and a half field angle range of 0° to 23°.

[0016] Figure 5 1 is a chromatic aberration diagram of light of the lens of the present invention in Example 1 within a wavelength range of 435nm-1000nm and a half field angle range of 32.53° to 51.43°.

[0017] Figure 6 1 is a chromatic aberration diagram of light of the lens of the present invention in Example 1 within a wavelength range of 435nm-1000nm and a half field angle range of 55° to 68.6°.

[0018] Figure 7 This is a point diagram of the lens of the present invention in Example 1.

[0019] Figure 8 This is the relative illumination diagram of the lens in Example 1.

[0020] Fig. 9 This is a structural diagram of the optical system of the lens in Example 2.

[0021] Fig.10 This is the MTF diagram of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm.

[0022] Fig.11 Graphs showing various aberrations of the lens of the present invention in Example 2.

[0023] Fig.12 4 is a chromatic aberration diagram of light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 0° to 23°.

[0024] Fig.13 4 is a chromatic aberration diagram of light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 32.53° to 51.43°.

[0025] Fig.14 2 is a chromatic aberration diagram of light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 55° to 68.6°.

[0026] Fig.15 This is a point diagram of the lens of the present invention in Example 2.

[0027] Fig.16This is the relative illumination diagram of the lens in Example 2.

[0028] Fig.17 This is a structural diagram of the optical system of the lens in Example 3.

[0029] Fig.18 This is the MTF diagram of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm.

[0030] Fig.19 Graphs showing various aberrations of the lens of the present invention in Example 3.

[0031] Fig. 20 3 is a chromatic aberration diagram of light of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm and the half field angle range of 0° to 23°.

[0032] Fig.21 3 is a chromatic aberration diagram of light of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm and the half field angle range of 32.53° to 51.43°.

[0033] Fig. 22 3 is a chromatic aberration diagram of light of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm and the half field angle range of 55° to 68.6°.

[0034] Fig.23 This is the point diagram of the lens of the present invention in Example 3.

[0035] Fig.24 This is the relative illumination diagram of the lens in Example 3.

[0036] Fig.25 It is a schematic structural diagram of the electronic device of the present invention.

[0037] L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens; L10, tenth lens; L11, eleventh lens; L12, twelfth lens; ST, aperture; G, protective glass; I MA, imaging surface. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0039] The object of the present invention is to provide a large aperture ultra-wide-angle micro-light lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an aperture, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a protective glass arranged in sequence along an optical axis from an object side to an image side.

[0040] The first lens has negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave;

[0041] The second lens has negative optical power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave;

[0042] The third lens has positive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface or a concave surface;

[0043] The fourth lens has negative optical power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;

[0044] The fifth lens has positive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

[0045] The sixth lens has positive power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave;

[0046] The seventh lens has positive power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave;

[0047] The eighth lens has negative optical power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface;

[0048] The ninth lens has positive focal power, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface;

[0049] The tenth lens has positive power, the object side surface of the tenth lens is convex, and the image side surface of the ninth lens is convex;

[0050] The eleventh lens has negative optical power, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface;

[0051] The twelfth lens has positive focal power, the object side surface of the twelfth lens is a convex surface, and the image side surface of the twelfth lens is a convex surface or a concave surface.

[0052] The beneficial effects of the above embodiment are: the lens adopts a twelve-piece design, the total optical length is controlled within 55mm, the maximum outer diameter of the lens is less than 35mm, the optical lens weighs less than 38g, and an ultra-compact optical structure is adopted internally. The overall design takes into account both volume and weight, meeting the requirements of lightweight design.

[0053] Among them, refer to Figure 1 , Fig. 9 , Fig.17 In the figure, the first lens is denoted by L1, the second lens is denoted by L2, the third lens is denoted by L3, the fourth lens is denoted by L4, the fifth lens is denoted by L5, the sixth lens is denoted by L6, the seventh lens is denoted by L7, the eighth lens is denoted by L8, the ninth lens is denoted by L9, the tenth lens is denoted by L10, the eleventh lens is denoted by L11, the twelfth lens is denoted by L12, the aperture is denoted by ST, the protective glass is denoted by G, and the imaging surface is denoted by I MA.

[0054] The absolute value of the ratio of the focal length F1 of the first lens to the overall focal length F of the lens satisfies the following relationship: 4≤|F1 / F|≤5;

[0055] The absolute value of the ratio of the focal length F2 of the second lens to the overall focal length F of the lens satisfies the following relationship: 2.5≤|F2 / F|≤4;

[0056] The absolute value of the ratio of the focal length F3 of the third lens to the overall focal length F of the lens satisfies the following relationship: 6≤|F3 / F|≤8;

[0057] The absolute value of the ratio of the focal length F4 of the fourth lens to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F4 / F|≤2.5;

[0058] The absolute value of the ratio of the focal length F5 of the fifth lens to the overall focal length F of the lens satisfies the following relationship: 1≤|F5 / F|≤4;

[0059] The absolute value of the ratio of the focal length F6 of the sixth lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F6 / F|≤5;

[0060] The absolute value of the ratio of the focal length F7 of the seventh lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F7 / F|≤5;

[0061] The absolute value of the ratio of the focal length F8 of the eighth lens to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F8 / F|≤2;

[0062] The absolute value of the ratio of the focal length F9 of the ninth lens to the overall focal length F of the lens satisfies the following relationship: 1.5≤|F9 / F|≤4;

[0063] The focal length F of the tenth lens 10 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1≤|F 10 / F|≤3;

[0064] The focal length F of the eleventh lens 11 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F 11 / F|≤3.5;

[0065] The focal length F of the twelfth lens 12 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1≤|F 12 / F|≤5.

[0066] The beneficial effects of the above embodiments are: further reducing the combined focal length of the lens, making the structure of the lens compact.

[0067] Furthermore, the first lens and the second lens are meniscus negative lenses. The use of high refractive index materials can effectively increase the field of view FOV, ensure a large field of view, large angle and large aperture ratio for the optical system, and help compress the front aperture of the optical system to achieve miniaturization of the lens. The second lens can also be regarded as a split lens of the first lens, jointly assuming the imaging range of the ultra-wide angle field of view, effectively balancing the aberration caused by the first lens at a large field of view, and effectively suppressing the angle of the off-axis field of view light incident on the sensing element, so that the incident angle of the edge field of view light on the subsequent optical element is small, and further correcting the aberration of the off-axis field of view.

[0068] Furthermore, the third lens is a meniscus-shaped positive focal length lens, which can provide part of the focal length required by the large aperture ultra-wide-angle micro-light lens of the present invention, and help to compress the total optical length of the lens.

[0069] Furthermore, the fourth lens and the fifth lens are a first cemented lens group. More specifically, the fourth lens is a double concave lens with negative power, and the fifth lens is a double convex lens with positive power, and the two are combined to form a first cemented lens group with positive power. The combination of the two can improve the smoothness of the light of the lens, improve the optical performance of the lens, reduce the optical distortion of the lens, improve the imaging quality, and improve the compactness of the internal space of the lens.

[0070] Furthermore, the lens satisfies the following relationship: Nd6>1.8, Nd7>1.95; wherein Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens. The beneficial effects of the above embodiment are: the sixth lens and the seventh lens use high refractive index materials, which can converge the angle of light entering the aperture and the rear group, reduce the large aperture sensitivity of the large aperture ultra-wide-angle micro-light lens of the present invention, balance the aberration generated by the front lens of the lens, and improve the lens resolution.

[0071] Furthermore, the lens satisfies the following relationship: Nd8>1.8, Vd8<26, Nd9<1.6, Vd9>68; wherein, Nd8 is the refractive index of the eighth lens, Vd8 is the Abbe coefficient of the eighth lens, Nd9 is the refractive index of the ninth lens, and Vd9 is the Abbe coefficient of the ninth lens.

[0072] The beneficial effects of the above embodiment are as follows: the eighth lens is a negative power lens and is made of a material with high refractive index, high dispersion and low Abbe number, the ninth lens is a positive power lens and is made of a material with low refractive index, low dispersion and high Abbe number, and the eighth lens and the ninth lens are cemented to form a second cemented lens group. Such a lens group can correct primary chromatic aberration and make the focus of the cut-off long wavelength and the short wavelength on the optical axis coincide.

[0073] Furthermore, the ninth lens is a positive power lens, and within the temperature range of -40°C to 105°C, dn / dT < -7*10E-6. Wherein, dn / dT is the temperature coefficient of the refractive index of the material used for the ninth lens. By satisfying the above formula, it means that the refractive index of the selected material decreases significantly with increasing temperature, which can effectively balance the temperature drift and realize the athermal design of the lens.

[0074] Furthermore, the lens satisfies the following relationship: Vd9-Vd8>40; wherein Vd8 is the Abbe coefficient of the eighth lens, and Vd9 is the Abbe coefficient of the ninth lens. The beneficial effect of the above embodiment is that the eighth lens and the ninth lens are combined with high and low dispersion materials, which is conducive to correcting secondary chromatic aberration and can effectively improve the imaging quality of the lens.

[0075] The lens satisfies the following relationship: Nd 10 <1.6、Vd 10 >70、Nd 11 >1.7, Vd 11 <27; among which, Nd 10 is the refractive index of the tenth lens, Vd 10 is the Abbe coefficient of the tenth lens, Nd 11 is the refractive index of the eleventh lens, Vd 11 is the Abbe coefficient of the eleventh lens.

[0076] The beneficial effects of the above embodiment are as follows: the tenth lens is a positive power lens, and is made of a material with low refractive index, low dispersion, and high Abbe number; the eleventh lens is a negative power lens, and is made of a material with high refractive index, high dispersion, and low Abbe number; the tenth lens and the eleventh lens are cemented to form a third cemented lens group. Such a lens group can correct primary chromatic aberration, so that the focus of the cut-off long wavelength and the short wavelength on the optical axis coincide.

[0077] Furthermore, the tenth lens is a positive power lens, and within the temperature range of -40°C to 105°C, dn / dT < -8*10E-6. Wherein, dn / dT is the temperature coefficient of the refractive index of the material used for the tenth lens. By satisfying the above formula, it means that the refractive index of the selected material decreases significantly with increasing temperature, which can effectively balance the temperature drift and realize the athermal design of the lens.

[0078] Furthermore, the lens satisfies the following relationship: Vd 10 -Vd 11 >45; among them, Vd 10 is the Abbe coefficient of the tenth lens, Vd 11 is the Abbe coefficient of the eleventh lens. The beneficial effects of the above embodiment are: the tenth lens and the eleventh lens are combined with high and low dispersion materials, which is conducive to correcting secondary chromatic aberration and can effectively improve the imaging quality of the lens.

[0079] Furthermore, the twelfth lens is a molded aspheric glass with positive optical power. The selection of aspheric glass can effectively eliminate spherical aberration, and the characteristics of the aspheric surface can better focus the light to a small point, thereby relatively reducing the imaging blur phenomenon and improving the image quality. The twelfth lens has an aspheric surface without an inflection point, which is convenient for mold manufacturing and interference measurement.

[0080] In summary, the beneficial effects of the present invention are as follows:

[0081] Firstly, the lens of the present invention solves the problem that the wavelength of low light is within the range of 435nm-1000nm and the field of view is small (most of the field of view angles in the prior art are less than 100°). The optical system of the present invention has a field of view of 137°-140° corresponding to a 1-inch target surface diagonal and a horizontal field of view of 110°, corresponding to a target surface level of 12.24mm. It can capture a wide range of images, breaking the blank dilemma that low-light use environment and large capture angle and wide capture range cannot be achieved at the same time.

[0082] Secondly, the wavelength range of the optical system of the lens of the present invention is 435nm-1000nm, which is suitable for application in special scenes, such as dark and low-light environments.

[0083] Third, the lens of the present invention adopts 12 optical lenses, including 11 glass spherical lenses (ground glass spherical surfaces) and 1 glass aspherical lens (molded glass aspherical surface). The total optical length is controlled within 55mm, the maximum outer diameter of the lens is less than 35mm, the weight of the optical lens is less than 38g, and an ultra-compact optical structure is adopted internally. The overall design takes into account both volume and weight, meeting the requirements of lightweight design.

[0084] Fourthly, the optical system of the lens of the present invention satisfies the requirement that the image plane size is larger than 1 inch target surface, and can be adapted to mainstream sensors on the visual surface, such as 1288*1032 pixels and 9.5um pixel size (pixel), and the optical performance satisfies the full field of view 1F>0.4@52lp / mm.

[0085] Fifth, the optical system of the lens of the present invention has a light transmission of F1.4, high light transmission, high energy utilization, good low-light effect, and can output high-definition images even in night environments.

[0086] Sixth, the focal length of the optical system of the lens of the present invention is 6.0mm-6.2mm. When the light transmission is constant, the focal length is small, the depth of field is large, and the range of the distances in front of and behind the object measured by the lens when obtaining a clear image is wide.

[0087] Seventh, the optical system of the lens of the present invention has small ghost image energy, small pixels occupied by ghost images, and small target surface area.

[0088] Eighth, the present invention can effectively balance the low-order aberrations of the lens by reasonably controlling the materials used and the positive and negative distribution of the optical power of each lens, while reducing the sensitivity of the lens tolerance, thereby improving the resolving power of the optical system under the conditions that can be achieved in existing manufacturing, and increasing the resolution performance of the optical system.

[0089] The present invention will be described in more detail below in conjunction with the following tables. It should be noted that the following tables are only specific embodiments of the present invention, rather than limiting examples.

[0090] For the convenience of description, in the table, surface number 1 and surface number 2 are the object side surface and image side surface of the first lens, respectively; surface number 3 and surface number 4 are the object side surface and image side surface of the second lens, respectively; surface number 5 and surface number 6 are the object side surface and image side surface of the third lens, respectively; surface number 7 and surface number 8 are the object side surface and image side surface of the fourth lens, respectively; surface number 8 and surface number 9 are the object side surface and image side surface of the fifth lens, respectively; surface number 10 and surface number 11 are the object side surface and image side surface of the sixth lens, respectively; surface number 12 and surface number 13 are the object side surface and image side surface of the seventh lens, respectively; Surface number 14 is the surface of the aperture; surface number 15 and surface number 16 are respectively the object side surface and image side surface of the eighth lens; surface number 16 and surface number 17 are respectively the object side surface and image side surface of the ninth lens; surface number 18 and surface number 19 are respectively the object side surface and image side surface of the tenth lens; surface number 19 and surface number 20 are respectively the object side surface and image side surface of the eleventh lens; surface number 21 and surface number 22 are respectively the object side surface and image side surface of the twelfth lens; surface number 23 and surface number 24 are respectively the object side surface and image side surface of the protective glass; surface number 25 is the surface of the imaging surface.

[0091] For the optical structure of Example 1, please refer to Figure 1 Specific parameters of this embodiment 1 are shown in the following table 1. In this embodiment 1, the focal length of the lens f=6mm, the aperture F=1.4, the field of view angle FOV=138°, the target surface size I MH=15.68mm, and the total length TTL=55mm.

[0092] Table 1 - Lens parameters of Example 1

[0093]

[0094]

[0095] Table 2- Arrangement of aspheric coefficients of the twelfth lens in Example 1

[0096]

[0097] For the optical structure of Example 2, please refer to Fig. 9 , the specific parameters of this embodiment 2 are shown in the following table 3. In this embodiment 2, the focal length of the lens f=6.2mm, the aperture F=1.4, the field of view angle FOV=138°, the target surface size I MH=15.68mm, and the total length TTL=55mm.

[0098] Table 3 - Lens parameters of Example 2

[0099]

[0100] Table 4 - Arrangement of aspheric coefficients of the twelfth lens in Example 2

[0101]

[0102]

[0103] For the optical structure of Example 17, please refer to Fig. 9 , the specific parameters of this embodiment 3 are shown in the following table 5. In this embodiment 3, the focal length of the lens f=6.1mm, the aperture F=1.4, the field of view angle FOV=137°, the target surface size I MH=15.68mm, and the total length TTL=55mm.

[0104] Table 5 - Lens parameters of Example 3

[0105]

[0106]

[0107] Table 6- Arrangement of aspheric coefficients of the twelfth lens in Example 3

[0108]

[0109] According to Tables 1-6, the conditional formulas of Embodiments 1 to 3 of the present invention can be read as follows:

[0110] parameter Example 1 Example 2 Example 3 Lens aperture F 1.4 1.4 1.4 Lens focal length f 6mm 6.2mm 6.1mm Diagonal field of view 138° 138° 137° Horizontal field of view 110° 110° 110° Total lens length TTL 55.00mm 55.00mm 55.00mm Lens optical back focus BFL 5.30 6.17 5.18 The lens design is like high h 15.68 15.68 15.68 TTL / h 3.51 3.51 3.51 (FOV*f) / h 52.81 54.57 53.30

[0111] By setting the lens TTL / h parameter, the optical lens can be miniaturized, and the total length can be shorter within the same imaging range.

[0112] By satisfying the above parameter setting of the lens (FOV*f) / h, a large angular resolution of the lens can be achieved, and a wider field of view can be achieved at the same focal length.

[0113] The following is an explanation of the various figures:

[0114] Figure 1 : is a diagram of the optical system structure of the lens in Example 1. In this embodiment, the image side surface of the third lens is a concave surface, and the image side surface of the twelfth lens is a convex surface.

[0115] Figure 2 This is the MTF diagram of the lens of the present invention in the wavelength range of 435nm-1000nm in Example 1. It can be seen from the figure that under the conditions of field of view angle FOV = 138° and target surface size I MH = 15.68mm, the MTF value is greater than 0.4 at 52l p / mm, indicating that the lens of this embodiment has high resolution and good imaging quality.

[0116] Figure 3The aberration diagrams of the lens of the present invention in Example 1 are shown in Figure 1. From left to right, they are the axial aberration diagram, the field curvature diagram, and the distortion diagram. It can be seen from the figure that the axial chromatic aberration of the lens is well corrected within the wavelength range of 435nm-1000nm, and clear imaging can be achieved; the field curvature curve shows that both the T line and the S line have good convergence, and the field curvature and astigmatism are both excellent, ensuring the uniform imaging requirement of the entire image surface.

[0117] Figure 4 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 1 within the wavelength range of 435nm-1000nm and the half field angle range of 0° to 23°. It can be seen from the figure that the lens has a good correction of magnification chromatic aberration and coma within the wavelength range of 435nm-1000nm, meeting the pixel requirements.

[0118] Figure 5 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 1 within the wavelength range of 435nm-1000nm and the half field angle range of 32.53°~51.43°. It can be seen from the figure that: within the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0119] Figure 6 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 1 within the wavelength range of 435nm-1000nm and the half field angle range of 55°~68.6°. It can be seen from the figure that: within the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0120] Figure 7 This is the spot diagram of the lens of the present invention in Example 1. It can be seen from the figure that the more compact the spot diagram is, the smaller the aberration is, and the better the imaging quality of the lens is.

[0121] Figure 8 This is a relative illumination diagram of the lens in Example 1. It can be seen from the figure that when the lens ensures that the diagonal half field of view FOV = 68°, the relative illumination is greater than 50%, indicating that the relative illumination of the lens is high.

[0122] Fig. 9 : is a diagram of the optical system structure of the lens in Example 2. In this embodiment, the image side surface of the third lens is a concave surface, and the image side surface of the twelfth lens is a concave surface.

[0123] Fig.10This is the MTF diagram of the lens of the present invention in the wavelength range of 435nm-1000nm in Example 2. It can be seen from the figure that under the conditions of field of view angle FOV=138° and target surface size I MH=15.68mm, the MTF value is greater than 0.38 at 52l p / mm, indicating that the lens of this embodiment has high resolution and good imaging quality.

[0124] Fig.11 The aberration diagrams of the lens of the present invention in Example 2 are shown in Figure 1. From left to right, they are the axial aberration diagram, the field curvature diagram, and the distortion diagram. It can be seen from the figure that the axial chromatic aberration of the lens is well corrected within the wavelength range of 435nm-1000nm, and clear imaging can be achieved; the field curvature curve shows that both the T line and the S line have good convergence, and the field curvature and astigmatism are both excellent, ensuring the uniform imaging requirement of the entire image surface.

[0125] Fig.12 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 0° to 23°. It can be seen from the figure that the lens has a good correction of magnification chromatic aberration and coma within the wavelength range of 435nm-1000nm, meeting the pixel requirements.

[0126] Fig.13 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 32.53°~51.43°. It can be seen from the figure that: within the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0127] Fig.14 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 2 within the wavelength range of 435nm-1000nm and the half field angle range of 55°~68.6°. It can be seen from the figure that: within the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0128] Fig.15 This is the spot diagram of the lens of the present invention in Example 2. It can be seen from the figure that the more compact the spot diagram is, the smaller the aberration is, and the better the imaging quality of the lens is.

[0129] Fig.16 This is a relative illumination diagram of the lens in Example 2. It can be seen from the figure that when the lens ensures that the diagonal half field of view FOV = 68°, the relative illumination is greater than 50%, indicating that the relative illumination of the lens is high.

[0130] Fig.17: is a diagram of the optical system structure of the lens in Example 3. In this embodiment, the image side surface of the third lens is a convex surface, and the image side surface of the twelfth lens is a concave surface.

[0131] Fig.18 This is the MTF diagram of the lens of the present invention in the wavelength range of 435nm-1000nm in Example 3. It can be seen from the figure that under the conditions of field of view angle FOV=137° and target surface size I MH=15.68mm, the MTF value is greater than 0.35 at 52l p / mm, indicating that the lens of this embodiment has high resolution and good imaging quality.

[0132] Fig.19 The aberration diagrams of the lens of the present invention in Example 3 are shown in Figure 3. From left to right, they are the axial aberration diagram, the field curvature diagram, and the distortion diagram. It can be seen from the figure that the axial chromatic aberration of the lens is well corrected within the wavelength range of 435nm-1000nm, and clear imaging can be achieved; the field curvature curve shows that both the T line and the S line have good convergence, and the field curvature and astigmatism are both excellent, ensuring the uniform imaging requirement of the entire image surface.

[0133] Fig. 20 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm and the half field angle range of 0° to 23°. It can be seen from the figure that the lens has a good correction of magnification chromatic aberration and coma within the wavelength range of 435nm-1000nm, meeting the pixel requirements.

[0134] Fig.21 This is Example 3, a chromatic aberration diagram of light of the lens of the present invention in the wavelength range of 435nm-1000nm and the half field angle range of 32.53°~51.43°. It can be seen from the figure that: in the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0135] Fig. 22 This is a chromatic aberration diagram of the light of the lens of the present invention in Example 3 within the wavelength range of 435nm-1000nm and the half field angle range of 55°~68.6°. It can be seen from the figure that: within the wavelength range of 435nm-1000nm, the magnification chromatic aberration and coma of the lens are well corrected, meeting the pixel requirements.

[0136] Fig.23 This is the spot diagram of the lens of the present invention in Example 3. It can be seen from the figure that the more compact the spot diagram is, the smaller the aberration is, and the better the imaging quality of the lens is.

[0137] Fig.24This is a relative illumination diagram of the lens in Example 3. It can be seen from the figure that when the lens ensures that the diagonal half field of view FOV = 68°, the relative illumination is greater than 50%, indicating that the relative illumination of the lens is high.

[0138] On the other hand, now refer to Fig.25 , a schematic structural diagram of an electronic device A according to the present invention will be given. Fig.10 This is a schematic diagram of an electronic device (camera) in which any of the large-aperture ultra-wide-angle micro-light lenses according to Examples 1 to 3 is used in an imaging optical system.

[0139] exist Fig.25 , reference numeral A2 denotes an electronic device body, and reference numeral A1 denotes an imaging optical system (interchangeable lens) including any one of the large-aperture ultra-wide-angle microlight lenses according to Examples 1 to 3. Reference numeral A3 denotes an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (optical image formed by the imaging optical system A1) from the imaging optical system A1 and performs photoelectric conversion.

[0140] By using the large-aperture ultra-wide-angle micro-light lens according to any one of Embodiments 1 to 3 for electronic equipment such as a digital still camera or the like, an electronic equipment having high optical performance can be obtained.

[0141] Various examples may provide electronic devices having high optical performance.

[0142] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A large aperture ultra-wide angle low light lens, characterized in that: comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence along the optical axis from the object side to the image side; The first lens has negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; The second lens has negative optical power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; The third lens has positive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface or a concave surface; The fourth lens has negative optical power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; The fifth lens has positive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; The sixth lens has positive power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; The seventh lens has positive power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; The eighth lens has negative optical power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface; The ninth lens has positive focal power, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface; The tenth lens has positive power, the object side surface of the tenth lens is convex, and the image side surface of the ninth lens is convex; The eleventh lens has negative optical power, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface; The twelfth lens has positive focal power, the object side surface of the twelfth lens is a convex surface, and the image side surface of the twelfth lens is a convex surface or a concave surface.

2. A large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The absolute value of the ratio of the focal length F1 of the first lens to the overall focal length F of the lens satisfies the following relationship: 4≤|F1 / F|≤5; The absolute value of the ratio of the focal length F2 of the second lens to the overall focal length F of the lens satisfies the following relationship: 2.5≤|F2 / F|≤4; The absolute value of the ratio of the focal length F3 of the third lens to the overall focal length F of the lens satisfies the following relationship: 6≤|F3 / F|≤8; The absolute value of the ratio of the focal length F4 of the fourth lens to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F4 / F|≤2.5; The absolute value of the ratio of the focal length F5 of the fifth lens to the overall focal length F of the lens satisfies the following relationship: 1≤|F5 / F|≤4; The absolute value of the ratio of the focal length F6 of the sixth lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F6 / F|≤5; The absolute value of the ratio of the focal length F7 of the seventh lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F7 / F|≤5; The absolute value of the ratio of the focal length F8 of the eighth lens to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F8 / F|≤2; The absolute value of the ratio of the focal length F9 of the ninth lens to the overall focal length F of the lens satisfies the following relationship: 1.5≤|F9 / F|≤4; The focal length F of the tenth lens 10 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1≤|F 10 / F|≤3; The focal length F of the eleventh lens 11 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 0.5≤|F 11 / F|≤3.5; The focal length F of the twelfth lens 12 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1≤|F 12 / F|≤5.

3. The large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The fourth lens and the fifth lens form a first cemented lens group.

4. The large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The lens satisfies the following relationship: Nd6>1.8, Nd7>1.95: Wherein, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.

5. The large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The eighth lens and the ninth lens form a second cemented lens group.

6. The large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The lens satisfies the following relationship: Nd8>1.8, Vd8<26, Nd9<1.6, Vd9>68; Wherein, Nd8 is the refractive index of the eighth lens, Vd8 is the Abbe coefficient of the eighth lens, Nd9 is the refractive index of the ninth lens, and Vd9 is the Abbe coefficient of the ninth lens.

7. The large aperture ultra-wide angle low light lens as claimed in claim 1, characterized in that: The tenth lens and the eleventh lens form a third cemented lens group.

8. The wide-spectrum wide-angle imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: Nd 10 <1.6、Vd 10 >70、Nd 11 >1.7、Vd 11 <27; Among them, Nd 10 is the refractive index of the tenth lens, Vd 10 is the Abbe coefficient of the tenth lens, Nd 11 is the refractive index of the eleventh lens, Vd 11 is the Abbe coefficient of the eleventh lens.

9. The wide-spectrum wide-angle imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: dn / dT<-8*10E-6. Wherein, dn / dT is the refractive index temperature coefficient of the material used for the tenth lens.

10. An electronic device, characterized in that: A large aperture ultra-wide-angle low-light lens according to any one of claims 1 to 9; and The image sensor is configured to receive the image formed by the large aperture ultra-wide angle low light lens.

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