TWM564165U - Seven-piece miniaturized fisheye lens - Google Patents

Abstract

A seven-piece miniaturized fisheye lens includes a first lens having negative refractive power, a second lens having negative refractive power, a third lens, and a fourth lens having positive refractive power, from the object side to the image side. An aperture, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens having positive refractive power. Wherein, the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side of the third lens object, and R6 is the first The radius of curvature of the side surface of the three lens image, R7 is the radius of curvature of the side surface of the fourth lens object, and R8 is the radius of curvature of the side surface of the fourth lens image. This can correct astigmatism and improve overall image quality, while helping to slow down the angle of light transition to reduce system manufacturing sensitivity.

Description

Seven-piece miniaturized fisheye lens

This creation relates to an optical system, and more particularly to a seven-piece imaging lens having the characteristics of a fisheye lens.

The angle of view of the fisheye lens is close to or greater than 180∘, which is generally used to capture vast landscapes or indoor photography. As the lens market for mobile devices is expanding, the fisheye lens also needs to meet the trend of miniaturization in the market, and how to make the fisheye lens maintain better resolution and reduce system sensitivity is considered by those skilled in the art. By.

The main purpose of this creation is to provide a high-resolution, man-made fisheye lens.

In order to achieve the above and other objects, the present invention provides a seven-piece miniaturized fisheye lens comprising a first lens, a second lens, a third lens, and a fourth lens from the object side to the image side. An aperture, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative refractive power and a convex side of the object side. The second lens has a negative refractive power and its image side is concave. The object side of the third lens is a concave surface. The fourth lens has a positive refractive power and its image side is convex. The fifth lens has a positive refractive power, and both the object side and the image side surface are convex. The sixth lens has a negative refractive power, and both the object side and the image side surface are concave. The seventh lens has a positive refractive power and a convex side of the object side. Wherein, the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side of the third lens object, and R6 is the first The radius of curvature of the side surface of the three lens image, R7 is the radius of curvature of the side surface of the fourth lens object, and R8 is the radius of curvature of the side surface of the fourth lens image. This can correct astigmatism and improve overall image quality, while helping to slow down the angle of light transition to reduce system manufacturing sensitivity.

In order to achieve the above and other objects, the present invention also provides a seven-piece miniaturized fisheye lens comprising a first lens, a second lens, a third lens and a fourth lens from the object side to the image side. , an aperture, a fifth lens, a sixth lens and a seventh lens. The radius of curvature of the side of the first lens is positive and greater than the radius of curvature of the image side. The radius of curvature of the side of the second lens image is positive and smaller than the radius of curvature of the side of the object. The radius of curvature of the side of the third lens is a negative value and smaller than the radius of curvature of the image side. The radius of curvature of the side surface of the fourth lens image is a negative value and smaller than the radius of curvature of the side surface of the object. The product of the radius of curvature of the side surface of the fifth lens object and the radius of curvature of the image side surface is a negative value. The product of the radius of curvature of the side surface of the sixth lens object and the radius of curvature of the image side surface is a negative value. The radius of curvature of the side of the seventh lens is positive and greater than the radius of curvature of the image side. Wherein, the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side of the third lens object, and R6 is the third lens Like the radius of curvature of the side, R7 is the radius of curvature of the side of the fourth lens, and R8 is the radius of curvature of the side of the fourth lens image. This can correct astigmatism and improve overall image quality, while helping to slow down the angle of light transition to reduce system manufacturing sensitivity.

In order to achieve the above and other objects, the present invention also provides a seven-piece miniaturized fisheye lens comprising a first lens, a second lens, a third lens and a fourth lens from the object side to the image side. , an aperture, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative refractive power and the object side is convex. The second lens has a negative refractive power and its image side is concave. The third lens has a positive refractive power and its image side is convex. The fourth lens has a positive refractive power with a concave side and a convex side. The fifth lens has a positive refractive power, and the object side surface and the image side surface thereof are convex. The sixth lens has a negative refractive power, and the object side surface and the image side surface thereof are both concave surfaces. The seventh lens has a positive refractive power and a convex side of the object side. Wherein, the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17, R5/R6>7; wherein R5 is the radius of curvature of the side of the third lens object R6 is the radius of curvature of the side surface of the third lens image, R7 is the radius of curvature of the side surface of the fourth lens object, and R8 is the radius of curvature of the side surface of the fourth lens image. This can improve the astigmatism and aberrations, improve the overall image quality, and at the same time help to slow down the light turning angle, in order to reduce system manufacturing sensitivity.

For the above and other purposes, the present invention also provides a seven-piece miniaturized fisheye lens comprising a first lens, a second lens, a third lens, and a fourth lens in sequence from the side of the object to the image side. An aperture, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative refractive power and the object side is convex. The second lens has a negative refractive power and its image side is concave. The third lens has a negative refractive power and its image side is concave. The fourth lens has a positive refractive power and both the object side and the image side surface are convex. The fifth lens has a positive refractive power, and the object side surface and the image side surface thereof are convex. The sixth lens has a negative refractive power, and both the object side and the image side surface are concave. The seventh lens has a positive refractive power and a convex side of the object side. Wherein, the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17, R5/R6<-11; wherein R5 is the curvature of the side of the third lens object The radius, R6 is the radius of curvature of the side of the third lens image, R7 is the radius of curvature of the side of the fourth lens object, and R8 is the radius of curvature of the side of the fourth lens image. This can correct astigmatism and improve overall image quality, while helping to slow down the angle of light transition to reduce system manufacturing sensitivity.

The aforementioned seven-piece miniaturized fisheye lens can further satisfy the following relationship: 1<f1/f2<4, where f1 is the focal length value of the first lens, and f2 is the focal length value of the second lens. This corrects the system spherical aberration and helps to improve image quality.

The aforementioned seven-piece miniaturized fisheye lens can more satisfy the following relationship: V1>45, wherein V1 is the dispersion coefficient of the first lens. This corrects the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can more satisfy the following relationship: V2>40, wherein V2 is the dispersion coefficient of the second lens. This corrects the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can further satisfy the following relationship: V5-V6>25, wherein V5 is the dispersion coefficient of the fifth lens, and V6 is the dispersion coefficient of the sixth lens. Thereby, the system spherical aberration is further corrected while correcting the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can more satisfy the following relationship: V6<24, wherein V6 is the dispersion coefficient of the sixth lens. Thereby, the dispersion coefficient of the cemented lens is balanced, thereby improving the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can further satisfy the following relationship: f4/f3>5, where f4 is the focal length value of the fourth lens, and f3 is the focal length value of the third lens. Thereby, the positive refractive powers of the third and fourth lenses are appropriately distributed, thereby obtaining better image quality.

The aforementioned seven-piece miniaturized fisheye lens can further satisfy the following relationship: V4-V3>37, wherein V4 is the dispersion coefficient of the fourth lens, and V3 is the dispersion coefficient of the third lens. This corrects the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can more satisfy the following relationship: V7<43, wherein V7 is the dispersion coefficient of the seventh lens. This corrects the system chromatic aberration.

The aforementioned seven-piece miniaturized fisheye lens can more satisfy the following relationship: f3/f4<-1, where f3 is the focal length value of the third lens, and f4 is the focal length value of the fourth lens. Thereby improving the spherical aberration of the system and balancing the refractive power configuration of the third and fourth lenses, thereby improving the image quality.

The aforementioned seven-piece miniaturized fisheye lens can further satisfy the following relationship: V3-V4>15, wherein V3 is the dispersion coefficient of the third lens, and V4 is the dispersion coefficient of the fourth lens. This corrects the system chromatic aberration.

Preferably, in the seven-piece miniaturized fisheye lens, there are only seven lenses having refractive power.

Preferably, in the seven-piece miniaturized fisheye lens, the fifth and sixth lenses are glued lenses.

The aforementioned seven-piece miniaturized fisheye lens can satisfy the following relationship: 8.5<R1/F<11.5, 3<R2/F<4, -0.2<F/f1<0,50<R3/F<135,2 <R4/F<2.3, -0.5<F/f2<-0.2, -40<R5/F<-15, -6<R6/F<3, -0.4<F/f3<0.3,-5<R7/ F<5, -4.5<R8/F<-3.5, 0<F/f4<0.5, 2.3<R9/F<3.5, -4<R10/F<-2, 0.3<F/f5<0.6,-4 <R11/F<-2,1<R12/F<6.5,-1<F/f6<-0.2,1<R13/F<6.5,-5<R14/F<-3,0.3<F/f7< 0.42, TTL/F<16; wherein R1 is the radius of curvature of the side of the first lens, R2 is the radius of curvature of the side of the first lens image, R3 is the radius of curvature of the side of the second lens, and R4 is the second R3 is the radius of curvature of the side of the lens, R5 is the radius of curvature of the side of the third lens, R6 is the radius of curvature of the side of the third lens image, R7 is the radius of curvature of the side of the fourth lens, and R8 is the fourth lens image. The radius of curvature of the side surface, R9 is the radius of curvature of the side surface of the fifth lens object, R10 is the radius of curvature of the side surface of the fifth lens image, R11 is the radius of curvature of the side surface of the sixth lens object, R12 is the radius of curvature The radius of curvature of the side surface of the six lens image, R13 is the radius of curvature of the side surface of the seventh lens object, R14 is the radius of curvature of the side surface of the seventh lens image, f1 is the focal length value of the first lens, and f2 is the focal length of the second lens. Value, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, f5 is the focal length value of the fifth lens, f6 is the focal length value of the sixth lens, and f7 is the focal length of the seventh lens Value, TTL is the system length of the seven-piece miniaturized fisheye lens, and F is the system focal length value of the seven-piece miniaturized fisheye lens. This can correct astigmatism and improve overall image quality, while helping to slow down the angle of light transition to reduce system manufacturing sensitivity.

Please refer to FIG. 1 , which is a first embodiment of the present invention. The seven-piece miniaturized fisheye lens (hereinafter referred to as a seven-piece lens) is on the optical axis L from the object side A to the image side B. The sequence includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, an aperture ST, a fifth lens 50, a sixth lens 60 and a seventh lens 70. A CCD, a CMOS or other photosensitive element (not shown) is disposed at the side B, and a flat lens 70 such as a filter and/or a protective glass may be disposed between the photosensitive element and the seventh lens 70, and the number of the flat lenses 70 may be Increase or decrease according to demand or not set. In this embodiment, there are only seven lenses having refractive power in the seven-piece lens.

In this embodiment, the first lens 10 has a negative refractive power, the object side surface is a convex surface and the image side surface is a concave surface, and the curvature radius of the object side surface and the image side surface are all positive values, and the curvature radius of the object side surface is larger than the curvature radius of the image side surface. . In this embodiment, the first lens 10 has a dispersion coefficient of 46.58 and helps to correct system chromatic aberration. In this paper, when the surface center of a curved surface is closer to the image side than the surface itself, the curvature radius of the surface is positive; otherwise, when the surface center of a curved surface is closer to the object side than the surface itself, the surface is The radius of curvature is negative. Herein, unless otherwise stated, the concave and convex shapes of the "object side" and the "image side" refer to the surface shape of the surface at the optical axis L.

The second lens 20 has a negative refractive power, the object side surface is a convex surface and the image side surface is a concave surface, and the curvature radius of the object side surface and the image side surface are both positive values, and the curvature radius of the image side surface is smaller than the curvature radius of the object side surface. In this embodiment, the focal length values of the first and second lenses 10, 20 are matched with each other, thereby correcting the spherical aberration of the system and contributing to image quality improvement. In addition, the second lens 20 has a dispersion coefficient of 40.9 and contributes to correcting system chromatic aberration.

The third lens 30 has a positive refractive power, the object side surface is a concave surface and the image side surface is a convex surface, and the curvature radius of the object side surface and the image side surface are both negative values, and the curvature radius of the object side surface is smaller than the curvature radius of the image side surface.

The fourth lens 40 has a positive refractive power, the object side surface is a concave surface and the image side surface is a convex surface, and the curvature radius of the object side surface and the image side surface are both negative values, and the curvature radius of the image side surface is smaller than the curvature radius of the object side surface. The matching of the radius of curvature between the side of the third and fourth lenses 30, 40 and the side of the image causes the astigmatism and aberration to be corrected, improves the overall image quality, and helps to slow down the angle of light transition, thereby reducing system manufacturing sensitivity. . In addition, the refractive powers of the third and fourth lenses 30, 40 are properly distributed, thereby contributing to better image quality. Furthermore, the dispersion coefficients of the third and fourth lenses are also appropriately matched, thereby correcting the system chromatic aberration.

The fifth lens 50 has a positive refractive power, and both the object side surface and the image side surface are convex surfaces, and the curvature radius of the object side surface is a positive value, and the curvature radius of the image side surface is a negative value, so the curvature radius of the object side surface and the curvature radius of the image side surface The product of is negative.

The sixth lens 60 has a negative refractive power, and the object side surface and the image side surface are both concave surfaces, and the curvature radius of the object side surface is a negative value, and the curvature radius of the image side surface is a positive value, so the curvature radius of the object side surface and the curvature radius of the image side surface. The product of is negative. In this embodiment, the fifth and sixth lenses 50, 60 are glued lenses. The sixth lens has a dispersion coefficient of 17.47, and the dispersion coefficients of the fifth and sixth lenses match each other, so that the dispersion coefficient of the cemented lens is matched, whereby the system chromatic aberration can be corrected, and the system spherical aberration can be further corrected.

The seventh lens 70 has a positive refractive power, and both the object side surface and the image side surface are convex surfaces, and the curvature radius of the object side surface is positive and larger than the curvature radius of the image side surface. The seventh lens 70 has a dispersion coefficient of 40.9, thereby helping to correct system chromatic aberration.

The design parameters of the seven-piece lens of this embodiment are as shown in Table 1 below:

Table I  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Lens</td><td> Face </td><td> Curvature Radius (mm) </td><td> Distance (mm) </td><td> Refractive Index (Nd) </td><td> Dispersion Coefficient (Vd) </td><td> Focal Length (mm) </td> </tr><tr><td> First lens</td><td> Side 1 </td><td> 10.72 </td><td> 1.10 </td><td> 1.80 </td ><td> 46.58 </td><td> -7.54 </td></tr><tr><td> Image side 2 </td><td> 3.71 </td><td> 1.97 </td ></tr><tr><td> second lens</td><td> object side 3 </td><td> 130.71 </td><td> 0.55 </td><td> 1.81 </ Td><td> 40.9 </td><td> -2.87 </td></tr><tr><td> Image side 4 </td><td> 2.28 </td><td> 1.34 </ Td></tr><tr><td> third lens</td><td> object side 5 </td><td> -36.08 </td><td> 2.02 </td><td> 1.96 </td><td> 17.47 </td><td> 5.75 </td></tr><tr><td> Image side 6 </td><td> -4.97 </td><td> 0.57 </td></tr><tr><td> fourth lens</td><td> object side 7 </td><td> -4.04 </td><td> 2.26 </td><td > 1.70 </td><td> 55.46 </td><td> 34.9 </td></tr><tr><td> Image side 8 </td><td> -4.26 </td><td > 0.12 </td></tr><tr><td> light Circle</td><td> </td><td> ∞ </td><td> -0.01 </td><td> </td><td> </td><td> </td> </tr><tr><td> fifth lens</td><td> object side 9 </td><td> 3.29 </td><td> 1.74 </td><td> 1.70 </td ><td> 48.52 </td><td> 2.75 </td></tr><tr><td> Image side 10 </td><td> -3.64 </td><td> 0 </td ></tr><tr><td> sixth lens</td><td> object side 11 </td><td> -3.64 </td><td> 0.50 </td><td> 1.96 < /td><td> 17.47 </td><td> -2.28 </td></tr><tr><td> Image side 12 </td><td> 6 </td><td> 0.19 < /td></tr><tr><td> Seventh lens</td><td> Side 13 </td><td> 6.01 </td><td> 0.89 </td><td> 1.81 </td><td> 40.9 </td><td> 3.01 </td></tr><tr><td> Image side 14 </td><td> -3.84 </td><td> 1.13 </td></tr><tr><td> Filter/protective glass</td><td> Object side 15 </td><td> ∞ </td><td> 0.90 </td> <td> </td><td> </td><td> </td></tr><tr><td> image side 16 </td><td> ∞ </td><td> 0.73 </td></tr></TBODY></TABLE>

Based on the foregoing design, the system focal length value F of the present embodiment is 1.05 mm, the system length is 16 mm, and the maximum viewing angle is 222 ∘.

At this time, the values of the relationship of the seven-piece lens are as shown in Table 2 below:

Table II  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Relationship </td><td> Value </td><td> Relationship </ Td><td> value</td></tr><tr><td> (R5×R6)/(R7×R8) </td><td> 10.42 </td><td> R9/F < /td><td> 3.15 </td></tr><tr><td> R5/R6 </td><td> 7.26 </td><td> R10/F </td><td> - 3.48 </td></tr><tr><td> f1/f2 </td><td> 2.63 </td><td> R11/F </td><td> -3.48 </td>< /tr><tr><td> V5-V6 </td><td> 31.05 </td><td> R12/F </td><td> 5.74 </td></tr><tr>< Td> f4/f3 </td><td> 6.07 </td><td> R13/F </td><td> 5.75 </td></tr><tr><td> V4-V3 </ Td><td> 37.99 </td><td> R14/F </td><td> -3.67 </td></tr><tr><td> R1/F </td><td> 10.25 </td><td> F/f1 </td><td> -0.14 </td></tr><tr><td> R2/F </td><td> 3.55 </td><td > F/F2 </td><td> -0.36 </td></tr><tr><td> R3/F </td><td> 124.28 </td><td> F/f3 </ Td><td> 0.18 </td></tr><tr><td> R4/F </td><td> 2.18 </td><td> F/f4 </td><td> 0.03 < /td></tr><tr><td> R5/F </td><td> -34.49 </td><td> F/f5 </td><td> 0.38 </td></tr ><tr><td> R6/F </td><td> -4.75 </td><td> F/f6 </td><td> -0.46 </ Td></tr><tr><td> R7/F </td><td> -3.86 </td><td> F/f7 </td><td> 0.35 </td></tr> <tr><td> R8/F </td><td> -4.07 </td><td> TTL/F </td><td> 15.24 </td></tr></TBODY></ TABLE>

In this way, the embodiment corrects astigmatism, aberration, chromatic aberration and spherical aberration, improves the overall image quality, and at the same time helps to slow down the light turning angle, so as to reduce the system manufacturing sensitivity, and the transverse light fan diagram of different viewing angles. As shown in FIGS. 1A to 1E, the lateral chromatic aberration diagram is as shown in FIG. 1F, and the maximum lateral chromatic aberration is less than ±5 μm. It can be seen that the modified chromatic aberration is excellent in the present embodiment, and the field curvature is as shown in FIG. 1G. The difference between the tangential field curvature curve (T line) and the radial field curvature curve (S line) does not exceed ±0.015 mm, and it is apparent that this embodiment has a good imaging effect.

Please refer to FIG. 2 , which is a second embodiment of the present invention. The lens configuration is similar to that of the first embodiment. The main difference is that the third lens has a negative refractive power and the image side is concave, and the fourth lens. The side of the object is convex. The design parameters of the seven-piece lens of this embodiment are as shown in Table 3 below:

Table 3  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Lens</td><td> Face </td><td> Curvature Radius (mm) </td><td> Distance (mm) </td><td> Refractive Index (Nd) </td><td> Dispersion Coefficient (Vd) </td><td> Focal Length (mm) </td> </tr><tr><td> First lens</td><td> Side 1 </td><td> 10.63 </td><td> 0.80 </td><td> 1.77 </td ><td> 49.6 </td><td> -8.5 </td></tr><tr><td> Image side 2 </td><td> 3.93 </td><td> 1.70 </td ></tr><tr><td> second lens</td><td> object side 3 </td><td> 68.21 </td><td> 0.50 </td><td> 1.59 </ Td><td> 61.15 </td><td> -4.25 </td></tr><tr><td> Image side 4 </td><td> 2.42 </td><td> 1.32 </ Td></tr><tr><td> third lens</td><td> object side 5 </td><td> -24.39 </td><td> 0.49 </td><td> 1.53 </td><td> 56 </td><td> -3.7 </td></tr><tr><td> image side 6 </td><td> 2.16 </td><td> 0.50 </td></tr><tr><td> fourth lens</td><td> object side 7 </td><td> 4.20 </td><td> 4.53 </td><td> 1.83 </td><td> 37.2 </td><td> 3.37 </td></tr><tr><td> Image 8 </td><td> -4.38 </td><td> 0.10 </td></tr><tr><td> aperture</td ><td> </td><td> ∞ </td><td> 0.15 </td><td> </td><td> </td><td> </td></tr>< Tr><td> fifth lens</td><td> object side 9 </td><td> 3.05 </td><td> 1.37 </td><td> 1.77 </td><td> 49.6 </td><td> 2.17 </td></tr><tr><td> Image side 10 </td><td> -3.00 </td><td> 0 </td></tr> <tr><td> Sixth lens</td><td> Side 11 </td><td> -3.00 </td><td> 0.52 </td><td> 1.85 </td><td > 23.8 </td><td> -1.45 </td></tr><tr><td> Image side 12 </td><td> 2.26 </td><td> 0.06 </td></ Tr><tr><td> seventh lens</td><td> object side 13 </td><td> 2.16 </td><td> 1.33 </td><td> 1.53 </td>< Td> 56 </td><td> 3.02 </td></tr><tr><td> Image side 14 </td><td> -4.96 </td><td> 0.43 </td>< /tr><tr><td> Filter/protective glass</td><td> Object side 15 </td><td> ∞ </td><td> 0.90 </td><td> </ Td><td> </td><td> </td></tr><tr><td> image side 16 </td><td> ∞ </td><td> 0.84 </td>< /tr></TBODY></TABLE>

Based on the foregoing design, the focal length value F of the present embodiment is 1.14 mm, the system length is 15.54 mm, and the maximum viewing angle is 222 ∘.

At this time, the values of the relationship of the seven-piece lens are as shown in Table 4 below:

Table 4  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Relationship </td><td> Value </td><td> Relationship </ Td><td> value</td></tr><tr><td> (R5×R6)/(R7×R8) </td><td> 2.86 </td><td> R9/F < /td><td> 2.67 </td></tr><tr><td> R5/R6 </td><td> -11.29 </td><td> R10/F </td><td> -2.62 </td></tr><tr><td> f1/f2 </td><td> 2 </td><td> R11/F </td><td> -2.62 </td> </tr><tr><td> V5-V6 </td><td> 25.8 </td><td> R12/F </td><td> 1.98 </td></tr><tr> <td> f3/f4 </td><td> -1.1 </td><td> R13/F </td><td> 1.89 </td></tr><tr><td> V3-V4 </td><td> 18.8 </td><td> R14/F </td><td> -4.34 </td></tr><tr><td> R1/F </td><td > 9.30 </td><td> F/f1 </td><td> -0.13 </td></tr><tr><td> R2/F </td><td> 3.44 </td> <td> F/F2 </td><td> -0.27 </td></tr><tr><td> R3/F </td><td> 59.68 </td><td> F/f3 </td><td> -0.31 </td></tr><tr><td> R4/F </td><td> 2.12 </td><td> F/f4 </td><td > 0.34 </td></tr><tr><td> R5/F </td><td> -21.34 </td><td> F/f5 </td><td> 0.53 </td> </tr><tr><td> R6/F </td><td> 1.89 </td><td> F/f6 </td><td> -0.79 </td></t r><tr><td> R7/F </td><td> 3.67 </td><td> F/f7 </td><td> 0.38 </td></tr><tr><td > R8/F </td><td> -3.83 </td><td> TTL/F </td><td> 13.63 </td></tr></TBODY></TABLE>

In this way, the embodiment corrects astigmatism, aberration, chromatic aberration and spherical aberration, improves the overall image quality, and at the same time helps to slow down the light turning angle, so as to reduce the system manufacturing sensitivity, and the transverse light fan diagram of different viewing angles. As shown in FIGS. 2A to 2E, the lateral chromatic aberration diagram is as shown in FIG. 2F, and the maximum lateral chromatic aberration is less than ±2 μm. It can be seen that the corrected chromatic aberration is excellent in the present embodiment, and the field curvature is as shown in FIG. 1G. The difference between the tangential field curvature curve (T line) and the radial field curvature curve (S line) does not exceed ±0.01 mm, and it is apparent that this embodiment has a good imaging effect.

10‧‧‧ first lens
20‧‧‧second lens
30‧‧‧ third lens
40‧‧‧Fourth lens
50‧‧‧ fifth lens
60‧‧‧ sixth lens
70‧‧‧ seventh lens
80‧‧‧ flat lenses
A‧‧‧ object side
B‧‧‧ image side
ST‧‧‧ aperture
L‧‧‧ optical axis

Figure 1 is a schematic view of the first embodiment of the creation.

1A to 1E are transverse light fan diagrams of the first embodiment at different viewing angles, showing a maximum scale of ±20 μm.

Fig. 1F is a lateral chromatic aberration diagram of the first embodiment of the creation.

Fig. 1G is a field curvature diagram of the first embodiment of the creation.

Figure 2 is a schematic view of the first embodiment of the creation.

2A to 2E are transverse light fan diagrams of the second embodiment at different viewing angles, showing a maximum scale of ±20 μm.

Fig. 2F is a lateral chromatic aberration diagram of the second embodiment of the creation.

Fig. 2G is a field curvature diagram of the second embodiment of the creation.

Claims (27)

A seven-piece miniaturized fisheye lens comprising, from the object side to the image side, a first lens having a negative refractive power and a convex side of the object surface; a second lens having a negative refractive power and a concave side of the image side; a third lens having a concave side; a fourth lens having a positive refractive power, the image side being a convex surface; an aperture; a fifth lens having a positive refractive power, the object side and the image side being convex; a six-lens lens having a negative refractive power, a concave side of the object side and the image side surface, and a seventh lens having a positive refractive power and a convex side of the object side; wherein the seven-piece miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side surface of the third lens object, R6 is the radius of curvature of the side surface of the third lens image, and R7 is the side surface of the fourth lens object. The radius of curvature, R8 is the radius of curvature of the side of the fourth lens image. A seven-piece miniaturized fisheye lens comprising, from the object side to the image side, a first lens having a radius of curvature of a side of the object being a positive value and greater than a radius of curvature of the image side thereof; a second lens having an image The radius of curvature of the side is positive and smaller than the radius of curvature of the side of the object; a third lens has a radius of curvature of the object side that is negative and smaller than the radius of curvature of the image side; a fourth lens whose radius of curvature of the image side a negative value and smaller than the radius of curvature of the side of the object; an aperture; a fifth lens, the product of the radius of curvature of the object side and the radius of curvature of the side of the object is a negative value; a sixth lens, the radius of curvature of the object side and The product of the radius of curvature of the side surface is a negative value; and the radius of curvature of the side surface of the seventh lens is positive and larger than the radius of curvature of the side of the image side; wherein the seven-piece miniaturized fisheye lens more satisfies the following relationship Formula: 0 < (R5 × R6) / (R7 × R8) <17; wherein R5 is the radius of curvature of the side of the third lens, R6 is the radius of curvature of the side of the third lens image, and R7 is the fourth lens Radius of curvature of the side R8 of the fourth lens for curvature of the image side surface of the radius. A seven-piece miniaturized fisheye lens comprising, from the object side to the image side, a first lens having a negative refractive power and a convex side of the object surface; a second lens having a negative refractive power and a concave side of the image side; a third lens having a positive refractive power and a convex side of the image side; a fourth lens having a positive refractive power, a concave side of the object surface and a convex side of the image side; an aperture; a fifth lens having a positive refractive power, The side surface and the image side surface thereof are convex surfaces; a sixth lens having a negative refractive power, the object side surface and the image side surface thereof are concave surfaces; and a seventh lens having a positive refractive power, the object side surface being a convex surface; wherein the seven lenses The miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side of the third lens, and R6 is the side of the third lens image. The radius of curvature, R7 is the radius of curvature of the side of the fourth lens, and R8 is the radius of curvature of the side of the fourth lens image; R5/R6>7. A seven-piece miniaturized fisheye lens comprising, from the object side to the image side, a first lens having a negative refractive power and a convex side of the object surface; a second lens having a negative refractive power and a concave side of the image side; a third lens having a negative refractive power and a concave side of the image side; a fourth lens having a positive refractive power, a side surface of the object and an image side thereof being convex; an aperture; a fifth lens having a positive refractive power and an object side And a side surface thereof is convex; a sixth lens having a negative refractive power, the object side surface and the image side surface thereof are concave surfaces; and a seventh lens having a positive refractive power, the object side surface being a convex surface; wherein the seven-piece lens The miniaturized fisheye lens further satisfies the following relationship: 0<(R5×R6)/(R7×R8)<17; wherein R5 is the radius of curvature of the side of the third lens object, and R6 is the curvature of the side of the third lens image. Radius, R7 is the radius of curvature of the side of the fourth lens object, R8 is the radius of curvature of the side of the fourth lens image; R5/R6 < -11. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: 1<f1/f2<4, wherein f1 is a focal length value of the first lens, and f2 is the The focal length value of the second lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: V1>45, wherein V1 is a dispersion coefficient of the first lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: V2>40, wherein V2 is a dispersion coefficient of the second lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: V5-V6>25, wherein V5 is a dispersion coefficient of the fifth lens, and V6 is the sixth The dispersion coefficient of the lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: V6 < 24, wherein V6 is the dispersion coefficient of the sixth lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 3, further satisfying the following relationship: f4/f3>5, wherein f4 is a focal length value of the fourth lens, and f3 is the third The focal length of the lens. The seven-piece miniaturized fisheye lens according to claim 1 or 2 further satisfies the following relationship: R5/R6>7. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 3, further satisfying the following relationship: V4-V3>37, wherein V4 is a dispersion coefficient of the fourth lens, and V3 is the third The dispersion coefficient of the lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: V7 < 43, wherein V7 is the dispersion coefficient of the seventh lens. The seven-piece miniaturized fisheye lens according to claim 1, 2 or 4, further satisfies the following relationship: f3/f4<-1, wherein f3 is the focal length value of the third lens, and f4 is the fourth lens. The focal length value. The seven-piece miniaturized fisheye lens according to claim 1 or 2 further satisfies the following relationship: R5/R6<-11. The seven-piece miniaturized fisheye lens according to claim 1, 2 or 4, further satisfies the following relationship: V3-V4>15, wherein V3 is the dispersion coefficient of the third lens, and V4 is the fourth lens Dispersion coefficient. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, wherein the lens having refractive power has only seven pieces. The seven-piece miniaturized fisheye lens of any one of claims 1 to 4, wherein the fifth and sixth lenses are cemented lenses. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: 8.5<R1/F<11.5, 3<R2/F<4, -0.2<F/f1 <0; wherein R1 is the radius of curvature of the side of the first lens, R2 is the radius of curvature of the side of the first lens image, f1 is the focal length of the first lens having a negative refractive power, and F is the small size of the seven-piece The focal length value of the fisheye lens system. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, further satisfying the following relationship: 50<R3/F<135, 2<R4/F<2.3, -0.5<F/f2 <-0.2; wherein R3 is the radius of curvature of the side surface of the second lens object, R4 is the radius of curvature of the side surface of the second lens image, f2 is the focal length value of the second lens having a negative refractive power, and F is the seven-piece shape The system focal length value of the miniaturized fisheye lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: -40<R5/F<-15, -6<R6/F<3, -0.4< F/f3<0.3, but F/f3 is not equal to 0; where f3 is the focal length value of the third lens, and F is the system focal length value of the seven-piece miniaturized fisheye lens. The seven-piece miniaturized fisheye lens of claim 1 or 2, wherein the third lens has a positive refractive power. The seven-piece miniaturized fisheye lens of claim 1 or 2, wherein the third lens has a negative refractive power. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: -5<R7/F<5, -4.5<R8/F<-3.5, 0<F /f4<0.5; where f4 is the focal length value of the fourth lens having positive refractive power, and F is the system focal length value of the seven-piece miniaturized fisheye lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: 2.3<R9/F<3.5, -4<R10/F<-2, 0.3<F/ F5<0.6; wherein R9 is the radius of curvature of the side surface of the fifth lens, R10 is the radius of curvature of the side surface of the fifth lens image, f5 is the focal length value of the fifth lens having positive refractive power, and F is the seven-piece shape The system focal length value of the miniaturized fisheye lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: -4<R11/F<-2,1<R12/F<6.5, -1<F /f6<-0.2; wherein R11 is the radius of curvature of the side surface of the sixth lens, R12 is the radius of curvature of the side surface of the sixth lens image, f6 is the focal length value of the sixth lens having negative refractive power, and F is the seventh The system focal length value of the chip miniaturized fisheye lens. The seven-piece miniaturized fisheye lens according to any one of claims 1 to 4, which satisfies the following relationship: 1<R13/F<6.5, -5<R14/F<-3, 0.3<F/ F7<0.42; wherein R13 is the radius of curvature of the side surface of the seventh lens, R14 is the radius of curvature of the side surface of the seventh lens image, f7 is the focal length value of the seventh lens having positive refractive power, and F is the seven-piece shape The system focal length value of the miniaturized fisheye lens.