CN114002827A - Compact high-illumination high-definition imaging lens - Google Patents
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- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
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- G—PHYSICS
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- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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Abstract
本发明公开了一种紧凑型高照度高清成像镜头，其从物侧至像侧沿一光轴依次包括第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜及第七透镜，第一透镜至第七透镜各自包括一物侧面以及一像侧面；第一透镜具负屈光率，第二透镜具负屈光率，第三透镜具正屈光率，第四透镜具正屈光率，第五透镜具正屈光率，第六透镜具负屈光率，第七透镜具正屈光率，该成像镜头具有屈光率的透镜只有上述七片。本发明沿物侧至像侧方向采用七片透镜，并通过对各个透镜的屈光率以及面型的排列设计，使镜头的FOV＞162°，监控范围广，同时，镜头在频率达250lp/mm时，全视场传递函数MTF值仍大于0.4，中心至边缘均匀度高，成像质量优良，满足超高清成像。
The invention discloses a compact high-intensity high-definition imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from the object side to the image side and a seventh lens, the first lens to the seventh lens each include an object side and an image side; the first lens has a negative refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, and the first lens has a negative refractive power. The fourth lens has a positive refractive power, the fifth lens has a positive refractive power, the sixth lens has a negative refractive power, and the seventh lens has a positive refractive power. The imaging lens has only the above seven lenses with a refractive power. The invention adopts seven lenses along the direction from the object side to the image side, and through the design of the dioptric power and the surface shape of each lens, the FOV of the lens is greater than 162°, and the monitoring range is wide. At the same time, the frequency of the lens reaches 250lp/ mm, the MTF value of the full field of view transfer function is still greater than 0.4, the center to edge uniformity is high, and the imaging quality is excellent, satisfying ultra-high-definition imaging.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a compact high-illumination high-definition imaging lens.
Background
With the continuous expansion and extension of monitoring systems in various application fields, more and more security lenses are used in various occasions and various working environment mirrors, generally, the security lenses refer to monitoring lenses of monitoring cameras, and the security lenses are widely applied due to the advantages of high sensitivity, strong light resistance, small distortion, small size, long service life, vibration resistance and the like.
However, the existing security monitoring lens generally has many defects, such as small field angle and insufficient monitoring range; the relative illumination of the edge of the ultra-wide-angle lens is generally low, so that the definition of an edge imaging picture is influenced; the resolving power of the lens is low, and the imaging noise is large; the ultra-wide angle lens has large volume and large installation and use limitation.
Disclosure of Invention
The present invention is directed to a compact high-illumination high-definition imaging lens, so as to solve at least one of the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a compact high-illumination high-definition imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens to the seventh lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the imaging lens has only the seven lenses with the refractive index.
Preferably, the second lens and the fourth lens are both glass aspheric lenses, and the rest lenses are all glass spherical lenses.
Preferably, the lens barrel further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Preferably, the image side surface of the fifth lens and the object side surface of the sixth lens are cemented with each other, and the following conditional expression is satisfied: vd5-vd6 > 25, where vd5 is the Abbe number of the fifth lens and vd6 is the Abbe number of the sixth lens.
Preferably, the lens satisfies the following conditional expressions:
1.95＜nd1＜2.05，1.55＜nd2＜1.65，1.9＜nd3＜2.05，
1.6＜nd4＜1.8，1.7＜nd5＜1.8，1.8＜nd6＜1.9，
1.7＜nd7＜1.8，
where nd1 is a refractive index of the first lens, nd2 is a refractive index of the second lens, nd3 is a refractive index of the third lens, nd4 is a refractive index of the fourth lens, nd5 is a refractive index of the fifth lens, nd6 is a refractive index of the sixth lens, and nd7 is a refractive index of the seventh lens.
Preferably, the lens satisfies the following conditional expressions:
25＜vd1＜35，60＜vd2＜70，20＜vd3＜35，
45＜vd4＜65，45＜vd5＜55，20＜vd6＜30，
45＜vd7＜55，
wherein vd1 is the abbe number of the first lens, vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, vd5 is the abbe number of the fifth lens, vd6 is the abbe number of the sixth lens, and vd7 is the abbe number of the seventh lens.
Preferably, the lens satisfies the following conditional expressions: TTL is less than 16.5mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the invention adopts seven lenses along the direction from the object side to the image side, and through the arrangement design of the refractive index and the surface type of each lens, the FOV of the lens is more than 162 degrees, the monitoring range is wide, meanwhile, when the frequency of the lens reaches 250lp/mm, the MTF value of the full-field transfer function is still more than 0.4, the uniformity from the center to the edge is high, the imaging quality is excellent, and the ultrahigh-definition imaging is met.
2. The relative illumination of the lens is more than 80%, the definition of the edge imaging picture can be almost consistent with that of the center, noise is not increased due to the decrease of the illumination, and the definition of the edge imaging picture is ensured.
3. The lens has TTL less than 16.5mm, and compared with other lenses, the TTL under the same imaging plane is shorter, so that the overall size of the lens is small, the structure is compact, the lens is convenient to mount and is better suitable for various application occasions.
Drawings
FIG. 1 is a light path diagram according to the first embodiment;
FIG. 2 is a graph of MTF of a lens in the first embodiment in the visible range of 470nm-650 nm;
FIG. 3 is a graph of relative illumination at 555nm in visible light according to an example;
FIG. 4 is a graph of lateral chromatic aberration of a lens in a first embodiment under visible light of 555 nm;
FIG. 5 is a light path diagram of the second embodiment;
FIG. 6 is a graph of MTF of a lens of the second embodiment in the visible range of 470-650 nm;
FIG. 7 is a graph of relative illumination at 555nm for visible light for a lens according to a second embodiment;
FIG. 8 is a lateral chromatic aberration curve under visible light of 555nm for a lens according to a second embodiment;
FIG. 9 is a light path diagram of the third embodiment;
FIG. 10 is a graph of MTF of a lens of the third embodiment in the visible range of 470-650 nm;
FIG. 11 is a graph of relative illuminance at 555nm of visible light for a lens according to a third embodiment;
FIG. 12 is a graph of lateral chromatic aberration of a lens of the third embodiment under visible light of 555 nm;
FIG. 13 is a light path diagram according to the fourth embodiment;
FIG. 14 is a graph of MTF of a lens of the fourth embodiment in the visible range of 470-650 nm;
FIG. 15 is a graph of relative illuminance at 555nm for visible light for a lens according to a fourth embodiment;
FIG. 16 is a lateral chromatic aberration curve diagram of the lens of the fourth embodiment under the visible light of 555 nm.
Description of reference numerals:
the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a diaphragm 8 and a protective glass 9.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses a compact high-illumination high-definition imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens to the seventh lens respectively comprise an object side surface facing the object side and enabling imaging light rays to pass and an image side surface facing the image side and enabling the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the imaging lens only comprises the seven lenses with the refractive index, the two lenses in front of the imaging lens are meniscus lenses with negative focal power and bend to the diaphragm, the angle of emergent rays corresponding to rays with large incident angles can be reduced, the FOV of the imaging lens can reach 162 degrees, and meanwhile, the design that the lenses bend to the diaphragm reduces the coma and spherical aberration of the system.
Preferably, the second lens and the fourth lens are both glass aspheric lenses, and the rest of lenses are glass spherical lenses, so that the use efficiency of the lenses is improved by increasing the use of even aspheric lenses, thereby reducing the use number of the lenses, effectively reducing the volume of the lens and simultaneously achieving better imaging effect.
The equation for the object-side and image-side curves of an aspheric lens is expressed as follows:
wherein:
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: the curvature of the aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn；
am: mth order QconCoefficient (the mth Q)con coefficient)；
Qm con: mth order QconPolynomial (the mth Q)con polynomial)。
Preferably, the lens barrel further comprises a diaphragm, the diaphragm is arranged between the third lens and the fourth lens, and astigmatism can be corrected by adjusting the distance between the diaphragm and the lens, and particularly coma, distortion and vertical axis aberration can be well corrected.
Preferably, the image side surface of the fifth lens and the object side surface of the sixth lens are cemented with each other, and the following conditional expression is satisfied: vd5-vd6 > 25, where vd5 is the abbe number of the fifth lens and vd6 is the abbe number of the sixth lens, the second order spectrum can be corrected by composing the double cemented lens with high and low dispersion materials.
Preferably, the lens satisfies the following conditional expressions:
1.95＜nd1＜2.05，1.55＜nd2＜1.65，1.9＜nd3＜2.05，
1.6＜nd4＜1.8，1.7＜nd5＜1.8，1.8＜nd6＜1.9，
1.7＜nd7＜1.8，
the nd1 is the refractive index of the first lens, the nd2 is the refractive index of the second lens, the nd3 is the refractive index of the third lens, the nd4 is the refractive index of the fourth lens, the nd5 is the refractive index of the fifth lens, the nd6 is the refractive index of the sixth lens, and the nd7 is the refractive index of the seventh lens.
Preferably, the lens satisfies the following conditional expressions:
25＜vd1＜35，60＜vd2＜70，20＜vd3＜35，
45＜vd4＜65，45＜vd5＜55，20＜vd6＜30，
45＜vd7＜55，
wherein vd1 is the abbe number of the first lens, vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, vd5 is the abbe number of the fifth lens, vd6 is the abbe number of the sixth lens, and vd7 is the abbe number of the seventh lens, the lens with negative focal power of the second lens is made of a material with high abbe number, and the lens with positive focal power of the third lens is made of a material with low abbe number, so that the primary chromatic aberration of the lens can be effectively corrected.
Preferably, the lens satisfies the following conditional expressions: TTL is less than 16.5mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
The imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
Referring to fig. 1, the present embodiment discloses a compact high-illuminance high-definition imaging lens, which includes, in order along an optical axis from an object side a1 to an image side a2, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, and a seventh lens element 7, where the first lens element 1 to the seventh lens element 7 each include an object side surface facing the object side a1 and allowing passage of imaging light rays, and an image side surface facing the image side a2 and allowing passage of imaging light rays;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are concave;
the third lens element 3 has a positive refractive index, and the object-side surface and the image-side surface of the third lens element 3 are convex and convex;
the fourth lens element 4 has a positive refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are concave and convex, respectively;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a negative refractive index, and the sixth lens element 6 has a concave object-side surface and a concave image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a convex object-side surface and a convex image-side surface;
the imaging lens has only seven lenses with refractive index, the diaphragm 8 is arranged between the third lens 3 and the fourth lens 4, the second lens 2 and the fourth lens 4 are both glass aspheric lenses, the rest lenses are all glass spherical lenses, and the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are mutually glued.
Detailed optical data of this embodiment are shown in table 1.
Table 1 detailed optical data of example one
For detailed data of the parameters of the aspheric surfaces of the second lens 2 and the fourth lens 4, refer to the following table:
in the embodiment, the FOV is more than 162 degrees, the TTL is less than 16.5mm, the effective diameter of the lens is less than phi 8.8mm, the light transmission is F/2.0, and the lens has the advantages of small volume, wide monitoring range, convenience in installation and the like.
Fig. 1 is a schematic diagram of an optical path of an imaging lens in this embodiment. Please refer to fig. 2, it can be seen that when the spatial frequency of the lens reaches 250lp/mm, the full-field transfer function image is still larger than 0.4, the center-to-edge uniformity is high, the imaging quality is excellent, and ultra-high definition imaging is satisfied. Referring to fig. 3, it can be seen that the relative illuminance at the edge is greater than 80%, and the sharpness of the image at the edge can be almost consistent with the center. Please refer to fig. 4, which shows that the latercolor is smaller than 2.5um, so as to ensure that the image has no blue-violet side color difference and high image color reducibility.
Example two
As shown in fig. 5 to 8, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 2.
Table 2 detailed optical data of example two
For detailed data of the parameters of the aspheric surfaces of the second lens 2 and the fourth lens 4, refer to the following table:
in the embodiment, the FOV is more than 162 degrees, the TTL is less than 16.5mm, the effective diameter of the lens is less than phi 8.8mm, the light transmission is F/2.0, and the lens has the advantages of small volume, wide monitoring range, convenience in installation and the like.
Fig. 5 is a schematic diagram of an optical path of an imaging lens in this embodiment. Please refer to fig. 6, it can be seen that when the spatial frequency of the lens reaches 250lp/mm, the full-field transfer function image is still larger than 0.4, the center-to-edge uniformity is high, the imaging quality is excellent, and ultra-high definition imaging is satisfied. Referring to fig. 7, it can be seen that the relative illuminance at the edge is greater than 80%, and the sharpness of the image at the edge can be almost consistent with the center. Please refer to fig. 8, it can be seen that, the latercolor is smaller than 2.5um, which ensures that the image has no blue-violet side color difference and high image color reducibility.
EXAMPLE III
As shown in fig. 9 to 12, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 3.
Table 3 detailed optical data of example three
For detailed data of the parameters of the aspheric surfaces of the second lens 2 and the fourth lens 4, refer to the following table:
in the embodiment, the FOV is more than 162 degrees, the TTL is less than 16.5mm, the effective diameter of the lens is less than phi 8.8mm, the light transmission is F/2.0, and the lens has the advantages of small volume, wide monitoring range, convenience in installation and the like.
Fig. 9 is a schematic diagram of an optical path of an imaging lens in this embodiment. Please refer to fig. 10, it can be seen that when the spatial frequency of the lens reaches 250lp/mm, the full-field transfer function image is still larger than 0.4, the center-to-edge uniformity is high, the imaging quality is excellent, and ultra-high definition imaging is satisfied. Referring to fig. 11, it can be seen that the relative illuminance at the edge is greater than 80%, and the sharpness of the image at the edge can be almost consistent with the center. Please refer to fig. 12, which shows that the latercolor is smaller than 2.5um, so as to ensure that the image has no blue-violet side color difference and high image color reducibility.
Example four
As shown in fig. 13 to 16, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 4.
Table 4 detailed optical data for example four
For detailed data of the parameters of the aspheric surfaces of the second lens 2 and the fourth lens 4, refer to the following table:
in the embodiment, the FOV is more than 162 degrees, the TTL is less than 16.5mm, the effective diameter of the lens is less than phi 8.8mm, the light transmission is F/2.0, and the lens has the advantages of small volume, wide monitoring range, convenience in installation and the like.
Fig. 13 is a schematic diagram of an optical path of an imaging lens in this embodiment. Referring to fig. 14, it can be seen that when the spatial frequency of the lens reaches 250lp/mm, the full-field transfer function image is still larger than 0.4, the center-to-edge uniformity is high, the imaging quality is excellent, and ultra-high definition imaging is satisfied. Referring to fig. 15, it can be seen that the relative illuminance at the edge is greater than 80%, and the sharpness of the image at the edge can be almost consistent with the center. Please refer to fig. 16, which shows that the latercolor is smaller than 2.5um, so as to ensure that the image has no blue-violet side color difference and high color reproducibility.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
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