Camera lens group

A camera lens and camera lens technology, applied in the field of camera lens sets, can solve the problems of low infrared transmittance, difficult to improve optical distortion, and inability to meet imaging requirements in the near-infrared band, and achieve high imaging quality and high light transmission. rate effect

Pending Publication Date: 2018-12-18

ZHEJIANG SUNNY OPTICAL CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, most near-infrared lenses use spherical lenses, making it difficult to improve their optical distortion

At the same time, the current near-infrared lens is also susceptible to interference from ...

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Method used

In an exemplary embodiment, at least one lens in the first lens to the fifth lens is formed by an infrared single-band material such as FBK80, and the working band of the camera lens group can be the near-infrared spectrum of about 700nm to about 990nm Band, more specifically, the working band of the imaging lens group may be a near-infrared spectrum band from about 850nm to about 940nm. By using an infrared single-band material with high transmittance in the near-infrared band, it is ensured that the operating band of the lens is the near-infrared band, and the effect of effectively filtering other bands such as the visible band is achieved, thereby significantly reducing other bands such as the visible band. The influence of wavelength band on lens imaging. In addition, the above-mentioned infrared single-band material has a large Abbe number in the infrared band, and when used in conjunction with other materials, it can effectively reduce the aberration of the camera lens group and meet the imaging requirements of the near-infrared band.

In an exemplary embodiment, the imaging lens group of the present application can satisfy conditional formula 1.5<(R3+R4)/(R3-R4)<2.5, wherein, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens. More specifically, R3 and R4 may further satisfy 1.89≦(R3+R4)/(R3−R4)≦2.15. By controlling the radius of curvature of the object side of the second lens and the radius of curvature of the image side of the second lens, optical distortion can be reduced, thereby ensuring better imaging quality of the camera lens group.

In an exemplary embodiment, the imaging lens group of the present application can satisfy conditional formula 2.5

In an exemplary embodiment, the imaging lens group of the present application can satisfy the conditional formula -1.5

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Abstract

The application discloses a camera lens group. The lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from an object side to an image side alongan optical axis, wherein the first lens has a positive focus; the object side of the first lens is a convex side; the image side of the first lens is a concave side; the second lens has a negative focus; object side of the second lens is a convex side; the image side of the second lens is a concave side; the third lens has a positive focus; the fourth lens has a positive focus; the fifth lens hasa negative focus; the object side of the fifth lens is a convex side; the image side of the fifth lens is a concave side; and the wavelength lambdan corresponding to 50 percent of the transmission rate of the camera lens group satisfies that (lambdan-700) (lambdan-800) is less than or equal to 0.

Application Domain

Optical elements

Technology Topic

PhysicsCamera lens +4

Image

Examples

Experimental program(7)

Example Embodiment

[0066] Example 1

[0067] The following reference Figure 1 to Figure 2C The imaging lens group according to Embodiment 1 of the present application is described. figure 1 It shows a schematic structural diagram of a camera lens group according to Embodiment 1 of the present application.

[0068] Such as figure 1 As shown, the imaging lens group according to the exemplary embodiment of the present application includes in order from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 , The fifth lens E5, the filter E6 and the imaging surface S13.

[0069] The first lens E1 has a positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a positive refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0070] In this embodiment, the fourth lens E4 is formed of an infrared single-band material. The operating wavelength band of the imaging lens group is about 700 nm to about 990 nm, more specifically, about 850 nm to about 940 nm.

[0071] Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of Example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0072]

[0073]

[0074] Table 1

[0075] It can be seen from Table 1 that the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. In this embodiment, the surface shape x of each aspheric lens can be defined by but not limited to the following aspheric formula:

[0076]

[0077] Among them, x is the distance vector height of the aspheric surface at a height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table The reciprocal of the radius of curvature R in 1); k is the conic coefficient (given in Table 1); Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the high-order coefficient A that can be used for each aspheric mirror surface S1-S10 in Example 1. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 And A 20.

[0078] Face number

[0079] Table 2

[0080] Table 3 shows the effective focal lengths f1 to f5, total effective focal length f, the distance from the object side S1 of the first lens E1 to the imaging surface S13 on the optical axis of each lens of the camera lens group in Example 1, TTL, and the camera lens group The effective pixel area on the imaging plane S13 is half the diagonal length of ImgH.

[0081]

[0082] table 3

[0083] The camera lens group in Embodiment 1 satisfies the following relationship:

[0084] (λn-700)(λn-800)≤0, where λn is the corresponding wavelength value when the transmittance of the imaging lens group reaches 50%;

[0085] Vn=1935, where Vn is the maximum value of the dispersion coefficient of each of the first lens E1 to the fifth lens E5;

[0086] TTL/ImgH=1.35, where TTL is the distance from the object side S1 of the first lens E1 to the imaging surface S13 of the camera lens group on the optical axis, and ImgH is the diagonal length of the effective pixel area on the imaging surface S13 of the camera lens group Half of

[0087] f/f1=1.27, where f is the total effective focal length of the camera lens group, and f1 is the effective focal length of the first lens E1;

[0088] f2/f4=-1.87, where f2 is the effective focal length of the second lens E2, and f4 is the effective focal length of the fourth lens E4;

[0089] -R9/f5=-1.31, where R9 is the radius of curvature of the object side S9 of the fifth lens E5, and f5 is the effective focal length of the fifth lens E5;

[0090] R2/(R1×2)=2.84, where R1 is the radius of curvature of the object side S1 of the first lens E1, and R2 is the radius of curvature of the image side S2 of the first lens E1;

[0091] (R3+R4)/(R3-R4)=1.93, where R3 is the radius of curvature of the object side S3 of the second lens E2, and R4 is the radius of curvature of the image side S4 of the second lens E2;

[0092] DT52/(DT11×2)=1.52, where DT11 is the maximum effective radius of the object side S1 of the first lens E1, and DT52 is the maximum effective radius of the image side S10 of the fifth lens E5;

[0093] ΣAT/ΣCT=0.50, where ΣAT is the sum of the air space between any two adjacent lenses of the first lens E1 to the fifth lens E5 on the optical axis, and ΣCT is the first lens E1 to the fifth lens E5 Respectively the sum of the center thickness on the optical axis.

[0094] Figure 2A The astigmatism curve of the imaging lens group of Example 1 is shown, which represents meridional field curvature and sagittal field curvature. Figure 2B The distortion curve of the imaging lens group of Embodiment 1 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 2C The chromatic aberration curve of magnification of the imaging lens group of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. according to Figure 2A to Figure 2C It can be seen that the imaging lens set given in Embodiment 1 can achieve good imaging quality.

Example Embodiment

[0095] Example 2

[0096] The following reference Figure 3 to Figure 4C The imaging lens group according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. image 3 A schematic structural diagram of a camera lens group according to Embodiment 2 of the present application is shown.

[0097] Such as image 3 As shown, the imaging lens group according to the exemplary embodiment of the present application includes in order from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 , The fifth lens E5, the filter E6 and the imaging surface S13.

[0098] The first lens E1 has a positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a positive refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0099] In this embodiment, the fourth lens E4 is formed of an infrared single-band material. The operating wavelength band of the imaging lens group is about 700 nm to about 990 nm, more specifically, about 850 nm to about 940 nm.

[0100] Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of Example 2, wherein the units of the radius of curvature and thickness are millimeters (mm).

[0101]

[0102]

[0103] Table 4

[0104] It can be seen from Table 4 that in Example 2, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 5 shows the coefficients of higher-order terms that can be used for each aspheric mirror surface in Embodiment 2, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.

[0105] Face number

[0106] table 5

[0107] Table 6 shows the effective focal length f1 to f5, the total effective focal length f, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S13 on the optical axis of each lens of the camera lens group in Example 2 and the camera lens group The effective pixel area on the imaging plane S13 is half the diagonal length of ImgH.

[0108]

[0109] Table 6

[0110] Figure 4A The astigmatism curve of the imaging lens group of Example 2 is shown, which represents meridional field curvature and sagittal field curvature. Figure 4B The distortion curve of the imaging lens group of Embodiment 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4C The magnification chromatic aberration curve of the imaging lens group of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. according to Figure 4A to Figure 4C It can be seen that the imaging lens set given in Embodiment 2 can achieve good imaging quality.

Example Embodiment

[0111] Example 3

[0112] The following reference Figure 5 to Figure 6C The imaging lens group according to Embodiment 3 of the present application is described. Figure 5 It shows a schematic structural diagram of a camera lens group according to Embodiment 3 of the present application.

[0113] Such as Figure 5 As shown, the imaging lens group according to the exemplary embodiment of the present application includes in order from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 , The fifth lens E5, the filter E6 and the imaging surface S13.

[0114] The first lens E1 has a positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a positive refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0115] In this embodiment, the third lens E3, the fourth lens E4, and the fifth lens E5 are all formed of infrared single-band materials. The operating wavelength band of the imaging lens group is about 700 nm to about 990 nm, more specifically, about 850 nm to about 940 nm.

[0116] Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of Example 3. The units of the radius of curvature and thickness are millimeters (mm).

[0117]

[0118]

[0119] Table 7

[0120] It can be seen from Table 7 that in Example 3, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 8 shows the coefficients of higher-order terms that can be used for each aspheric mirror surface in Embodiment 3, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.

[0121] Face number

[0122] Table 8

[0123] Table 9 shows the effective focal lengths f1 to f5, total effective focal length f, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S13 on the optical axis of each lens of the camera lens group in Example 3, and the camera lens group The effective pixel area on the imaging plane S13 is half the diagonal length of ImgH.

[0124]

[0125] Table 9

[0126] Figure 6A The astigmatism curve of the imaging lens group of Example 3 is shown, which represents meridional field curvature and sagittal field curvature. Figure 6B The distortion curve of the imaging lens group of Embodiment 3 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 6C The magnification chromatic aberration curve of the imaging lens group of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. according to Figure 6A to Figure 6C It can be seen that the imaging lens set given in Embodiment 3 can achieve good imaging quality.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve light transmittance
High image quality

Camera lens group

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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