CN210199392U - Wide-angle lens - Google Patents
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- CN210199392U CN210199392U CN201921481832.4U CN201921481832U CN210199392U CN 210199392 U CN210199392 U CN 210199392U CN 201921481832 U CN201921481832 U CN 201921481832U CN 210199392 U CN210199392 U CN 210199392U
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Abstract
The utility model relates to a wide-angle lens, include along optical axis from the thing side to the image side arrange in proper order: a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having negative power, a STOP (STOP), a fourth lens (L4) having positive power, a fifth lens (L5) having positive power, a sixth lens (L6) having negative power, and a seventh lens (L7) having positive power; the fifth lens (L5) is cemented with the sixth lens (L6) to constitute a cemented lens group having negative power. The lens of the utility model can meet the requirements of small volume, no virtual focus in the temperature range of-40 ℃ to 85 ℃ and the like, and has high relative brightness of the picture, high resolution and good shooting effect.
Description
Technical Field
The utility model relates to an optical imaging field especially relates to a wide-angle lens.
Background
With the rapid development of science and technology, the requirement for the resolution of the optical lens is higher and higher. Most wide-angle lenses in the current market cannot meet the requirement of high definition, and have small volume and no thermalization. Therefore, the present invention is directed to provide a solution to the above disadvantages, and to provide a wide-angle lens with a small size, no virtual focus in the temperature range of-40 ℃ to 85 ℃, and a resolution of 2000 ten thousand pixels or more.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned problem, provide a wide-angle lens.
To achieve the above object, the present invention provides a wide-angle lens, comprising: a first lens having a negative power, a second lens having a negative power, a third lens having a negative power, a diaphragm, a fourth lens having a positive power, a fifth lens having a positive power, a sixth lens having a negative power, and a seventh lens having a positive power;
the fifth lens and the sixth lens are combined into a cemented lens group with negative focal power through gluing.
According to an aspect of the present invention, the first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a concave-convex lens, the fourth lens is a convex-convex lens, the fifth lens is a convex-convex lens, the sixth lens is a concave-concave lens, and the seventh lens is a convex-convex lens.
According to an aspect of the present invention, the first lens, the fourth lens, the fifth lens and the sixth lens are spherical lenses;
the second lens, the third lens, and the seventh lens are aspheric lenses.
According to the utility model discloses an aspect still includes chip protection glass, chip protection glass is located between seventh lens and the image plane.
According to an aspect of the present invention, the focal length fb of the cemented lens assembly of the fifth lens and the sixth lens and the effective focal length f of the lens satisfy the following relation: fb/f is not less than 3.4 and not more than-2.9.
According to the utility model discloses an aspect, the effective focal length f of camera lens with first lens object side satisfies the relational expression to the distance D of image planes: f/D is more than or equal to 0.14.
According to the utility model discloses an aspect, the effective focal length f and the half high h of image of camera lens satisfy the relational expression: f/h is less than or equal to 0.75.
According to the utility model discloses an aspect, burnt D behind the camera lens with first lens object side satisfies the relational expression to distance D of image planes: D/D is more than or equal to 0.19.
According to the utility model discloses an aspect, the chief ray angle CRA of the biggest visual field of camera lens satisfies relational expression: CRA is less than or equal to 17 degrees.
According to an aspect of the present invention, the temperature coefficient of relative refractive index dn/dt of at least one of the fourth lens element, the fifth lens element and the seventh lens element satisfies the following relation: dn/dt is less than or equal to 0.
According to the utility model discloses an aspect has the material of two pieces of lenses at least to be low dispersion glass, and abbe number VD satisfies following relational expression: VD is more than or equal to 60.
According to the utility model discloses a scheme makes the aberration obtain effectual correction through the concavity and the positive and negative focal power of optimal configuration each lens. And wide-angle image capturing of a horizontal field angle of 134 ° can be realized.
According to the utility model discloses a scheme, the effective focal length f of the focal length fb and the camera lens of the cemented lens group that fifth lens and sixth lens are constituteed satisfies the relational expression: fb/f is not less than 3.4 and not more than-2.9. The effective focal length f of the lens and the distance D from the object side surface of the first lens to the image surface satisfy the relation: f/D is more than or equal to 0.14. The effective focal length f and the half-image height h of the lens satisfy the relation: f/h is less than or equal to 0.75. The distance D between the lens back focal length D and the object side surface of the first lens to the image surface satisfies the relational expression: D/D is more than or equal to 0.19. The chief ray angle CRA of the maximum field of view of the lens satisfies the relation: CRA is less than or equal to 17 degrees. The height of the lens image surface can reach phi 8.0mm, the CRA is less than or equal to 17 degrees, the lens image surface can be adapted to a plurality of sensors, the application prospect is wide, and the market competitiveness is improved.
According to an aspect of the present invention, the spherical lens and the aspheric lens are used in combination, and the temperature coefficient of relative refractive index dn/dt of at least one of the fourth lens L4, the fifth lens L5, and the seventh lens L7 satisfies the following relation: dn/dt is less than or equal to 0. The lens can realize no virtual focus within the temperature range of-40 ℃ to 85 ℃, and is suitable for different environments. And can realize high resolution of more than 2000 ten thousand, uniform overall illumination and high brightness (relative illumination is more than 60%). The total length of the lens is within 18.5mm, the defect of large volume of the existing lens is overcome, and the lens has good single-part and assembly tolerance and good manufacturability.
According to the utility model discloses a scheme, the material that has two pieces of lenses at least in the camera lens is low dispersion glass, and abbe number VD satisfies following relational expression: VD is more than or equal to 60. The method is beneficial to the correction of chromatic aberration of the optical system and realizes high resolution.
Drawings
Fig. 1 is a view schematically showing a configuration of a wide-angle lens according to a first embodiment of the present invention;
fig. 2 is an MTF diagram schematically illustrating a wide-angle lens according to a first embodiment of the present invention;
FIG. 3 is a Through-Focus-MTF graph schematically showing a frequency of 225lp/mm for a wide-angle lens according to a first embodiment of the present invention;
FIG. 4 is a Through-Focus-MTF diagram schematically illustrating a wide-angle lens according to a first embodiment of the present invention at a high temperature of 85 ℃ and a frequency of 225 lp/mm;
FIG. 5 is a schematic diagram showing a Through-Focus-MTF at 225lp/mm frequency at-40 ℃ in a wide-angle lens according to a first embodiment of the present invention;
fig. 6 is a structural view schematically showing a wide-angle lens according to a second embodiment of the present invention;
fig. 7 is an MTF diagram schematically showing a wide-angle lens according to a second embodiment of the present invention;
FIG. 8 is a Through-Focus-MTF graph schematically showing a wide-angle lens according to a second embodiment of the present invention, having a frequency of 225 lp/mm;
FIG. 9 is a Through-Focus-MTF diagram schematically showing a wide-angle lens according to a second embodiment of the present invention at a high temperature of 85 ℃ and a frequency of 225 lp/mm;
FIG. 10 is a view schematically showing Through-Focus-MTF at a frequency of 225lp/mm at a low temperature of-40 ℃ in a wide-angle lens according to a second embodiment of the present invention;
fig. 11 is a structural view schematically showing a wide-angle lens according to a third embodiment of the present invention;
fig. 12 is an MTF diagram schematically showing a wide-angle lens according to a third embodiment of the present invention;
fig. 13 is a Through-Focus-MTF diagram schematically showing a frequency of 225lp/mm for a wide-angle lens according to a third embodiment of the present invention;
fig. 14 is a Through-Focus-MTF diagram schematically showing a wide-angle lens according to a third embodiment of the present invention at a high temperature of 85 ℃ and a frequency of 225 lp/mm;
FIG. 15 is a view schematically showing Through-Focus-MTF at a frequency of 225lp/mm at a low temperature of-40 ℃ in a wide-angle lens according to a third embodiment of the present invention;
fig. 16 is a structural view schematically showing a wide-angle lens according to a fourth embodiment of the present invention;
fig. 17 is an MTF chart schematically showing a wide-angle lens according to a fourth embodiment of the present invention;
fig. 18 is a Through-Focus-MTF diagram schematically showing a frequency of 225lp/mm for a wide-angle lens according to a fourth embodiment of the present invention;
fig. 19 is a Through-Focus-MTF diagram schematically showing a wide-angle lens according to a fourth embodiment of the present invention at a high temperature of 85 deg.c and a frequency of 225 lp/mm;
FIG. 20 is a Through-Focus-MTF schematically showing a wide-angle lens at a frequency of 225lp/mm at a low temperature of-40 ℃ according to a fourth embodiment of the present invention;
fig. 21 is a structural view schematically showing a wide-angle lens according to a fifth embodiment of the present invention;
fig. 22 is an MTF diagram schematically showing a wide-angle lens according to a fifth embodiment of the present invention;
fig. 23 is a Through-Focus-MTF diagram schematically showing a frequency of 225lp/mm for a wide-angle lens according to a fifth embodiment of the present invention;
fig. 24 is a Through-Focus-MTF diagram schematically showing a wide-angle lens according to a fifth embodiment of the present invention at a high temperature of 85 ℃ and a frequency of 225 lp/mm;
fig. 25 is a Through-Focus-MTF schematically showing a frequency of 225lp/mm at a low temperature of-40 ℃.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.
Fig. 1 is a structural view schematically showing a wide-angle lens according to an embodiment of the present invention. As shown in fig. 1, the wide-angle lens of the present invention includes, arranged in order from an object side to an image side along an optical axis: a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having negative power, a STOP, a fourth lens L4 having positive power, a fifth lens L5 having positive power, a sixth lens L6 having negative power, and a seventh lens L7 having positive power. Wherein the fifth lens L5 is cemented with the sixth lens L6 to form a cemented lens group having negative power.
The utility model discloses in, first lens L1 is convex-concave lens, and second lens L2 is convex-concave lens, and third lens L3 is concave-convex lens, and fourth lens L4 is convex-convex lens, and fifth lens L5 is convex-convex lens, and sixth lens L6 is concave-concave lens, and seventh lens L7 is convex-convex lens.
In the present invention, the first lens L1, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are spherical lenses. The second lens L2, the third lens L3, and the seventh lens L7 are aspherical lenses.
The utility model discloses in, still include chip (sensor) protection glass CG, chip protection glass CG is located between seventh lens L7 and the image plane.
Further, the focal length fb of the cemented lens group consisting of the fifth lens L5 and the sixth lens L6 (i.e., the combined focal length of the fifth lens L5 and the sixth lens L6) and the effective focal length f of the lens satisfy the relation: fb/f is not less than 3.4 and not more than-2.9. The effective focal length f of the lens and the distance D from the object side surface of the first lens L1 to the image surface satisfy the relation: f/D is more than or equal to 0.14. The effective focal length f and the half-image height h of the lens satisfy the relation: f/h is less than or equal to 0.75. The back lens focus D (i.e. the distance from the image side surface of the seventh lens L7 to the image plane) and the distance D from the object side surface of the first lens L1 to the image plane satisfy the relation: D/D is more than or equal to 0.19. The chief ray angle CRA of the maximum field of view of the lens satisfies the relation: CRA is less than or equal to 17 degrees.
The utility model discloses in, have the relative refractive index temperature coefficient dn/dt of one piece of lens at least in fourth lens L4, fifth lens L5 and the seventh lens L7 to satisfy following relational expression: dn/dt is less than or equal to 0.
The utility model discloses in, spherical lens are the glass material, and aspheric lens can also be the plastic material for the glass material, but has the material of two pieces of lenses at least in the camera lens to be low dispersion glass, and abbe number VD satisfies following relational expression: VD is more than or equal to 60.
Through the design, the utility model discloses the camera lens can realize the high resolution more than 2000 ten thousand, and whole illuminance is even, and luminance is high (relative illuminance more than 60%). The aberration is effectively corrected by optimally configuring the positive and negative focal powers of the respective lenses. Moreover, the height of the image surface can reach phi 8.0mm, the CRA is less than or equal to 17 degrees, the sensor can be adapted to multiple sensors, the application prospect is wide, and the market competitiveness is improved. And can realize no virtual coke at the temperature of between 40 ℃ below zero and 85 ℃, and is suitable for different environments. Meanwhile, wide-angle image capture with a horizontal field angle of 134 degrees can be realized. And, the utility model discloses the camera lens total length has overcome the bulky shortcoming of current this type of camera lens within 18.5mm, and camera lens unit spare and assembly tolerance are better moreover, have good manufacturability.
The following is a detailed description of five specific embodiments according to the present invention, provided in the above-described arrangement. Because according to the utility model discloses a total seven lenses of wide-angle camera lens, wherein, fifth lens L5 and sixth lens L6 constitute the cemented lens group, so seven lenses plus diaphragm STOP, chip protection glass CG and IMAGE plane IMAGE 17 faces altogether. The 17 faces are arranged in sequence according to the structural sequence of the present invention, and for convenience of description, the 17 faces are numbered as S1 to S17, where S7 where the diaphragm face is located is replaced by STO, S11 is the cemented surface of the fifth lens L5 and the sixth lens L6, and S0 is the object plane whose thickness is the size of the object distance. Further, in the following embodiments, the aspherical lens surface type satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a4, A6, A8, A10, A12, A14 and A16. the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders, respectively.
Five sets of embodiment data are as in table 1 below:
TABLE 1
Fig. 1 is a schematic diagram showing a wide-angle lens according to a first embodiment of the present invention. The first embodiment will be described based on the optical system configuration shown in fig. 1.
The first implementation mode comprises the following steps:
f number (i.e. inverse relative pore size) was 2.6; the total length of the lens is 18 mm; the field angle was 155 °.
Table 2 is a parameter table of the first embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | Spherical surface | Infinity | 1200 | ||
| S1 | Spherical surface | 11.5340 | 0.6 | 1.76 | 54.7 |
| S2 | Spherical surface | 3.2841 | 1.2359 | ||
| S3 | Aspherical surface | 5.1293 | 0.7 | 1.53 | 81.6 |
| S4 | Aspherical surface | 3.5258 | 1.4687 | ||
| S5 | Aspherical surface | -8.2887 | 0.94 | 1.75 | 45.1 |
| S6 | Aspherical surface | -19.0567 | 0.9624 | ||
| STO | Spherical surface | Infinity | 0.0972 | ||
| S8 | Spherical surface | 31.4914 | 2.02 | 1.53 | 54.7 |
| S9 | Spherical surface | -3.3727 | 0.9197 | ||
| S10 | Spherical surface | 9.8426 | 2.27 | 1.46 | 80.2 |
| S11 | Spherical surface | -3.5012 | 0.5 | 1.78 | 30.1 |
| S12 | Spherical surface | 7.9529 | 0.0978 | ||
| S13 | Aspherical surface | 16.8904 | 2.6121 | 1.56 | 71.6 |
| S14 | Aspherical surface | -14.5389 | 2.6477 | ||
| S15 | Spherical surface | Infinity | 0.5 | 1.52 | 64.2 |
| S16 | Spherical surface | Infinity | 0.778 | ||
| S17 | Spherical surface | Infinity | - | - | - |
TABLE 2
In the present embodiment, the aspheric data is shown in table 3 below, where K is a conic constant of the surface, and A, B, C, D, E, F, G are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders:
TABLE 3
Fig. 2 to 5 are MTF diagrams schematically showing a wide-angle lens according to a first embodiment of the present invention; according to the first embodiment of the present invention, the wide-angle lens has a Through-Focus-MTF map with a frequency of 225 lp/mm; according to the first embodiment of the present invention, the wide-angle lens is a Through-Focus-MTF graph with a frequency of 225lp/mm at a high temperature of 85 ℃; according to the utility model discloses a wide-angle lens of embodiment one at low temperature-40 ℃, the frequency is Through-Focus-MTF of 225 lp/mm.
By optimizing the above parameter values, the lens of the present embodiment realizes a small volume and high resolution, and has a characteristic of being free from heat and virtual focus in a temperature range of-40 ℃ to 85 ℃. Can meet excellent imaging effect under different temperature environments, and has high market competitiveness.
Fig. 6 is a schematic diagram showing a wide-angle lens according to a second embodiment of the present invention. The second embodiment will be described based on the optical system configuration shown in fig. 6.
The second embodiment:
the F number is 2.6; the total length of the lens is 17.5 mm; the field angle was 155 °.
Table 4 is a table of parameters of the second embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
TABLE 4
In the present embodiment, the aspheric data is as shown in table 5 below, where K is a conic constant of the surface, and A, B, C, D, E, F, G are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:
TABLE 5
Fig. 7 to 10 are MTF diagrams schematically showing a wide-angle lens according to a second embodiment of the present invention, respectively; according to the second embodiment of the present invention, the wide-angle lens has a Through-Focus-MTF map with a frequency of 225 lp/mm; according to the second embodiment of the present invention, the wide-angle lens is a Through-Focus-MTF graph with a frequency of 225lp/mm at a high temperature of 85 ℃; according to the second embodiment of the present invention, the wide-angle lens has a Through-Focus-MTF at a frequency of 225lp/mm at a temperature of-40 ℃.
By optimizing the above parameter values, the lens of the present embodiment realizes a small volume and high resolution, and has a characteristic of being free from heat and virtual focus in a temperature range of-40 ℃ to 85 ℃. Can meet excellent imaging effect under different temperature environments, and has high market competitiveness.
Fig. 11 is a structural view schematically showing a wide-angle lens according to a third embodiment of the present invention. The third embodiment will be described based on the optical system configuration shown in fig. 11.
The third embodiment is as follows:
the F number is 2.8; the total length of the lens is 18.34 mm; the field angle is 150 °.
Table 6 is a parameter table of the third embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | Spherical surface | Infinity | 1200 | ||
| S1 | Spherical surface | 12.1056 | 0.8119 | 1.71 | 54.3 |
| S2 | Spherical surface | 3.1080 | 1.1726 | ||
| S3 | Aspherical surface | 6.2022 | 0.8472 | 1.49 | 88.4 |
| S4 | Aspherical surface | 2.5666 | 1.4568 | ||
| S5 | Aspherical surface | -6.2939 | 0.9251 | 1.85 | 42.2 |
| S6 | Aspherical surface | -7.6634 | 1.1620 | ||
| STO | Spherical surface | Infinity | 0.0998 | ||
| S8 | Spherical surface | 21.4220 | 1.9986 | 1.73 | 55.0 |
| S9 | Spherical surface | -3.5730 | 0.7268 | ||
| S10 | Spherical surface | 11.4966 | 2.2720 | 1.46 | 91.2 |
| S11 | Spherical surface | -2.8075 | 0.4203 | 1.70 | 30.1 |
| S12 | Spherical surface | 7.5400 | 0.1872 | ||
| S13 | Aspherical surface | 5.1719 | 2.6570 | 1.50 | 82.0 |
| S14 | Aspherical surface | -4.0407 | 2.6254 | ||
| S15 | Spherical surface | Infinity | 0.5 | 1.52 | 64.2 |
| S16 | Spherical surface | Infinity | 0.48 | ||
| S17 | Spherical surface | Infinity | - | - | - |
TABLE 6
In the present embodiment, the aspheric data is as shown in table 7 below, where K is a conic constant of the surface, and A, B, C, D, E, F, G are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:
TABLE 7
Fig. 12 to 15 are MTF diagrams schematically showing a wide-angle lens according to a third embodiment of the present invention, respectively; according to the third embodiment of the present invention, a Through-Focus-MTF map with a frequency of 225lp/mm is provided; according to the third embodiment of the present invention, the wide-angle lens is a Through-Focus-MTF graph with a frequency of 225lp/mm at a high temperature of 85 ℃; according to the third embodiment of the present invention, the wide-angle lens has a Through-Focus-MTF at a low temperature of-40 ℃ and a frequency of 225 lp/mm.
By optimizing the above parameter values, the lens of the present embodiment realizes a small volume and high resolution, and has a characteristic of being free from heat and virtual focus in a temperature range of-40 ℃ to 85 ℃. Can meet excellent imaging effect under different temperature environments, and has high market competitiveness.
Fig. 16 is a structural view schematically showing a wide-angle lens according to a fourth embodiment of the present invention. The fourth embodiment will be described based on the optical system configuration shown in fig. 16.
The fourth embodiment:
the F number is 2.4; the total length of the lens is 18.0 mm; the field angle is 130 °.
Table 8 is a parameter table of the fourth embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
TABLE 8
In the present embodiment, the aspheric data is as shown in table 9 below, where K is a conic constant of the surface, and A, B, C, D, E, F, G are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:
TABLE 9
Fig. 17 to 20 are MTF diagrams schematically showing a wide-angle lens according to a fourth embodiment of the present invention, respectively; according to the fourth embodiment of the present invention, a Through-Focus-MTF map with a frequency of 225lp/mm is provided; according to the fourth embodiment of the present invention, the wide-angle lens is a Through-Focus-MTF graph with a frequency of 225lp/mm at a high temperature of 85 ℃; according to the fourth embodiment of the present invention, the wide-angle lens has a Through-Focus-MTF at a frequency of 225lp/mm at a temperature of-40 ℃.
By optimizing the above parameter values, the lens of the present embodiment realizes a small volume and high resolution, and has a characteristic of being free from heat and virtual focus in a temperature range of-40 ℃ to 85 ℃. Can meet excellent imaging effect under different temperature environments, and has high market competitiveness.
Fig. 21 is a structural view schematically showing a wide-angle lens according to a fifth embodiment of the present invention. The fifth embodiment will be described based on the optical system configuration shown in fig. 21.
The fifth embodiment:
the F number is 2.6; the total length of the lens is 18.2 mm; the field angle is 170 °.
Table 10 is a parameter table of embodiment five, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | Spherical surface | Infinity | Infinity | ||
| S1 | Spherical surface | 11.2110 | 0.8247 | 1.70 | 56.2 |
| S2 | Spherical surface | 3.0517 | 1.5570 | ||
| S3 | Aspherical surface | 7.3157 | 0.7027 | 1.50 | 81.7 |
| S4 | Aspherical surface | 2.5255 | 1.9587 | ||
| S5 | Aspherical surface | -4.2331 | 0.9530 | 1.86 | 29.2 |
| S6 | Aspherical surface | -5.1229 | 0.9380 | ||
| STO | Spherical surface | Infinity | 0.1029 | ||
| S8 | Spherical surface | 21.4911 | 1.9663 | 1.73 | 51.5 |
| S9 | Spherical surface | -3.0770 | 0.2212 | ||
| S10 | Spherical surface | 9.3297 | 2.0546 | 1.46 | 90.2 |
| S11 | Spherical surface | -2.3215 | 0.4007 | 1.70 | 30.1 |
| S12 | Spherical surface | 7.6313 | 0.1847 | ||
| S13 | Aspherical surface | 6.1391 | 2.5578 | 1.50 | 91.0 |
| S14 | Aspherical surface | -4.3227 | 2.9818 | ||
| S15 | Spherical surface | Infinity | 0.5 | 1.52 | 64.2 |
| S16 | Spherical surface | Infinity | 0.2 | ||
| S17 | Spherical surface | Infinity | - | - | - |
In the present embodiment, the aspheric data is as shown in table 11 below, where K is a conic constant of the surface, and A, B, C, D, E, F, G are aspheric coefficients of fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders:
TABLE 11
Fig. 22 to 25 are MTF diagrams schematically showing a wide-angle lens according to a fifth embodiment of the present invention, respectively; according to the fifth embodiment of the present invention, a Through-Focus-MTF map with a frequency of 225lp/mm is provided; according to the fifth embodiment of the present invention, a Through-Focus-MTF map with a frequency of 225lp/mm at a high temperature of 85 ℃; according to the present invention, the wide-angle lens of the fifth embodiment has a Through-Focus-MTF at a frequency of 225lp/mm at a temperature of-40 ℃.
By optimizing the above parameter values, the lens of the present embodiment realizes a small volume and high resolution, and has a characteristic of being free from heat and virtual focus in a temperature range of-40 ℃ to 85 ℃. Can meet excellent imaging effect under different temperature environments, and has high market competitiveness.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A wide-angle lens comprising, arranged in order from an object side to an image side along an optical axis: a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having negative power, a STOP (STOP), a fourth lens (L4) having positive power, a fifth lens (L5) having positive power, a sixth lens (L6) having negative power, and a seventh lens (L7) having positive power;
the fifth lens (L5) is cemented with the sixth lens (L6) to constitute a cemented lens group having negative power.
2. The wide-angle lens according to claim 1, wherein the first lens (L1) is a convex-concave lens, the second lens (L2) is a convex-concave lens, the third lens (L3) is a concave-convex lens, the fourth lens (L4) is a convex-convex lens, the fifth lens (L5) is a convex-convex lens, the sixth lens (L6) is a concave-concave lens, and the seventh lens (L7) is a convex-convex lens.
3. The wide-angle lens according to claim 2, wherein the first lens (L1), the fourth lens (L4), the fifth lens (L5), and the sixth lens (L6) are spherical lenses;
the second lens (L2), the third lens (L3), and the seventh lens (L7) are aspherical lenses.
4. The wide-angle lens according to claim 3, further comprising a chip protection glass (CG) located between the seventh lens (L7) and an image plane.
5. The wide-angle lens according to one of claims 1 to 4, wherein a focal length fb of a cemented lens group consisting of the fifth lens (L5) and the sixth lens (L6) and an effective focal length f of the lens satisfy the relation: fb/f is not less than 3.4 and not more than-2.9.
6. The wide-angle lens as claimed in one of claims 1 to 4, wherein an effective focal length f of the lens and a distance D from an object side surface to an image surface of the first lens (L1) satisfy the relation: f/D is more than or equal to 0.14.
7. The wide-angle lens of any one of claims 1 to 4, wherein an effective focal length f and a half-image height h satisfy the relationship: f/h is less than or equal to 0.75.
8. The wide-angle lens as claimed in one of claims 1 to 4, wherein a distance D between a lens back focal length D and an object side surface of the first lens (L1) to an image plane satisfies a relation: D/D is more than or equal to 0.19.
9. A wide-angle lens as claimed in any one of claims 1 to 4, wherein the Chief Ray Angle (CRA) of the maximum field of view of the lens satisfies the relation: CRA is less than or equal to 17 degrees.
10. The wide-angle lens according to any one of claims 1 to 4, wherein a temperature coefficient of relative refractive index dn/dt of at least one of the fourth lens (L4), the fifth lens (L5), and the seventh lens (L7) satisfies the following relationship: dn/dt is less than or equal to 0.
11. The wide-angle lens according to any one of claims 1 to 4, wherein at least two lenses are made of low dispersion glass, and the Abbe number VD satisfies the following relation: VD is more than or equal to 60.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412752A (en) * | 2019-09-06 | 2019-11-05 | 舜宇光学(中山)有限公司 | Wide-angle lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412752A (en) * | 2019-09-06 | 2019-11-05 | 舜宇光学(中山)有限公司 | Wide-angle lens |
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