CN108490582B - Imaging lens and image acquisition equipment with same - Google Patents
Imaging lens and image acquisition equipment with same Download PDFInfo
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- CN108490582B CN108490582B CN201810272819.1A CN201810272819A CN108490582B CN 108490582 B CN108490582 B CN 108490582B CN 201810272819 A CN201810272819 A CN 201810272819A CN 108490582 B CN108490582 B CN 108490582B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an imaging lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens has positive refractive power, the second lens has negative refractive power, the fifth lens has negative refractive power, the object side surface of the fifth lens is of a concave structure, and the image side surface of the fifth lens is of a convex structure; the sixth lens element with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region; by combining the surface shape structure of each lens of the seven-lens type imaging lens and the optimization range of the optical parameters, the imaging lens can effectively shorten the total length of the imaging lens and improve the visual angle of the lens under the condition of maintaining high imaging quality, and has high resolution brought by high pixels.
Description
Technical Field
The invention relates to the technical field of imaging equipment, in particular to an imaging lens and image acquisition equipment with the imaging lens.
Background
With the rapid development of electronic technology in recent years, mobile portable electronic devices have rapidly become widespread. The popularization of mobile portable electronic devices has led to the vigorous development of modules, such as imaging lenses and various sensors, included in the mobile portable electronic devices. Meanwhile, the imaging lens is applied more and more widely, for example, the imaging lens is applied to smart phones, tablet computers, automobile data recorders, motion cameras and the like which are highly popular at present. The intelligent portable electronic equipment has the advantages that the requirement of people on the mobile electronic equipment terminal is higher and higher while great convenience is brought to life, the existing intelligent portable electronic equipment is not only used for shooting long-range scenes, but also is used for shooting portrait, close-range scenes and the like, and higher requirements are provided for the resolving power, the aperture, the angle of view and the like of an imaging lens.
At present, the mainstream imaging lens is designed by adopting a five-lens or six-lens type lens, and although the structure can be thinned, the structure is difficult to improve the higher pixel and imaging quality on the basis. In addition, the distance from the object-side surface of the first lens element to the image plane of the current seven-lens imaging lens is large on the optical axis, which is not favorable for the thinning of mobile phones and digital cameras.
In view of the above, there is a need for an imaging lens having a shorter overall length, a larger field angle, and a better imaging quality. Therefore, how to manufacture an imaging lens meeting the requirements of consumer electronics, which has good imaging quality, excellent field angle, large aperture and short lens length, has been pursued in the field for a long time.
Disclosure of Invention
The invention aims to provide an imaging lens, which is adapted to each electronic imaging module device, and by combining the surface shape structure of each lens of the seven-lens type imaging lens and the optimization range of optical parameters, the imaging lens can effectively shorten the total length of the imaging lens and improve the visual angle of the lens under the condition of maintaining high imaging quality, has high resolution power brought by high pixels, and is provided for small or thin portable devices needing to be equipped with high imaging quality equipment, such as mobile phones, PDAs, computers, cameras, automobile data recorders or cameras and the like; the invention also provides image acquisition equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
an imaging lens 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 in sequence, wherein each lens is provided with an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens element with positive refractive power has a convex object-side surface;
the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element with refractive power;
the fourth lens element with refractive power;
the fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0；
wherein f is a focal length of the imaging lens, f16 is a combined focal length of the first lens to the sixth lens, f3 is a focal length of the third lens, CT3 is a central thickness of the third lens on an optical axis, CT4 is a central thickness of the fourth lens on the optical axis, CT5 is a central thickness of the fifth lens on the optical axis, CT6 is a central thickness of the sixth lens on the optical axis, AG45 is an air space between the fourth lens and the fifth lens on the optical axis, and AG56 is an air space between the fifth lens and the sixth lens on the optical axis.
Optionally, the object-side surface of the third lens element is convex at a paraxial region, and the image-side surface of the third lens element is convex.
Optionally, the following relation is also satisfied: -2.0< R61/R62< -0.5, wherein R61 is a radius of curvature of the object-side surface of the sixth lens, and R62 is a radius of curvature of the image-side surface of the sixth lens.
Optionally, the following relation is also satisfied: 1.0< f15/f16<2.0, wherein f15 is a combined focal length of the first to fifth lenses.
Optionally, the following relation is also satisfied: 0.8< f26/f36<2.0, where f26 is the combined focal length of the second to sixth lenses and f36 is the combined focal length of the third to sixth lenses.
Optionally, the following relation is also satisfied: 10< (f + f6) (f + f7) <30, wherein f6 is the focal length of the sixth lens and f7 is the focal length of the seventh lens.
Optionally, the following relation is also satisfied: 0.4< LCT14/LCT26<1.0, where LCT14 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens and LCT26 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the sixth lens.
Optionally, the following relation is also satisfied: 1.4< CT6/ET6<2.2, wherein ET6 is the edge thickness of the sixth lens.
Optionally, the object-side surface of the third lens element is of a concave structure, and the image-side surface of the third lens element is of a convex structure, and further satisfies the following relation:
0.4< CT3/ET3<0.8, wherein ET3 is the edge thickness of the third lens.
Optionally, the following relation is also satisfied: 1.0< (R41+ R42)/(R41-R42) <1.6, wherein R41 is a radius of curvature of the object-side surface of the fourth lens, and R42 is a radius of curvature of the image-side surface of the fourth lens.
Optionally, the following relation is also satisfied: -5.50< (f/R51+ f/R52) < -4.0, wherein R51 is a radius of curvature of the object-side surface of the fifth lens, and R52 is a radius of curvature of the image-side surface of the fifth lens.
An image acquisition device comprises the imaging lens.
Optionally, the image acquisition device is a mobile phone, a PDA, a computer, a camera, a vehicle event data recorder or a camera.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the imaging lens provided by the embodiment of the invention is of a seven-lens type, the surface shape structure of each lens is combined with the optimal range of optical parameters, the whole length of the imaging lens can be effectively shortened and the visual angle of the imaging lens can be improved under the condition of maintaining high imaging quality, and the imaging lens has high resolution power brought by high pixels, thereby being provided for a small or thin portable device which needs to be provided with high imaging quality equipment.
Drawings
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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of an imaging lens according to an embodiment of the present invention.
Fig. 2 is an astigmatism and distortion diagram of an imaging lens according to a first embodiment.
Fig. 3 is a spherical aberration diagram of an imaging lens according to an embodiment.
Fig. 4 is a schematic diagram of an imaging lens according to a second embodiment of the present invention.
Fig. 5 is an astigmatism and distortion diagram of an imaging lens according to the second embodiment.
Fig. 6 is a spherical aberration diagram of an imaging lens according to the second embodiment.
Fig. 7 is a schematic diagram of an imaging lens according to a third embodiment of the present invention.
Fig. 8 is an astigmatism and distortion diagram of an imaging lens according to a third embodiment.
Fig. 9 is a spherical aberration diagram of an imaging lens according to a third embodiment.
Fig. 10 is a schematic diagram of an imaging lens according to a fourth embodiment of the present invention.
Fig. 11 is an astigmatism and distortion diagram of an imaging lens according to a fourth embodiment.
Fig. 12 is a spherical aberration diagram of an imaging lens according to the fourth embodiment.
Illustration of the drawings:
a first lens 10; a second lens 20; a third lens 30; a fourth lens 40; a fifth lens 50; a sixth lens 60; a seventh lens 70; an infrared filter 80; an imaging plane 90.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For convenience of description, the following symbols are defined:
f: the focal length of the imaging lens;
f 3: a focal length of the third lens;
f 6: a focal length of the sixth lens;
f 7: a focal length of the seventh lens;
f 15: a combined focal length of the first lens to the fifth lens;
f 16: a combined focal length of the first lens to the sixth lens;
f 26: a combined focal length of the second lens to the sixth lens;
f 36: a combined focal length of the third lens to the sixth lens;
r41 radius of curvature of the object-side surface of the fourth lens;
r42 is the curvature radius of the image side surface of the fourth lens;
r51 radius of curvature of the object-side surface of the fifth lens;
r52 radius of curvature of the image-side surface of the fifth lens element;
r61 radius of curvature of the object-side surface of the sixth lens;
r62 radius of curvature of the image-side surface of the sixth lens element;
CT 3: a center thickness of the third lens on the optical axis;
CT 4: a center thickness of the fourth lens on the optical axis;
CT 5: a center thickness of the fifth lens on the optical axis;
CT 6: a center thickness of the sixth lens on the optical axis;
ET3 edge thickness of third lens;
ET6 rim thickness of sixth lens;
AG 45: the air space between the fourth lens and the fifth lens on the optical axis;
AG 56: the air space between the fifth lens and the sixth lens on the optical axis;
LCT 14: the distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis;
LCT 26: and the distance from the object side surface of the second lens to the image side surface of the sixth lens on the optical axis.
The present invention provides an imaging lens assembly, sequentially from an object side to an image side, the imaging lens assembly including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, each of the lens elements having an object side surface facing the object side and allowing an imaging light to pass therethrough and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with positive refractive power has a convex object-side surface;
the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element with refractive power;
the fourth lens element with refractive power;
the fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region.
The imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0。
the imaging lens can converge the light rays with large visual angle entering the imaging lens through the first lens with positive refractive power, and can inhibit the spherical aberration generated by the first lens through the meniscus-shaped second lens with negative refractive power so as to ensure that the aberration of the section is not too large. The fifth lens element with meniscus-shaped negative refractive power can increase light passing through the concave object-side surface and the convex image-side surface. The sixth lens with the center thickness larger than the edge thickness and the object side surface and the image side surface which are of the biconvex structure focuses light rays in the center part, guides the light rays in the edge part, and ensures the image height, so that the image surface curvature and the distortion are well corrected. The seventh lens closest to the image side surface of the imaging lens is of a biconcave structure at a paraxial region, the edge thickness of the seventh lens is larger than the center thickness of the seventh lens, the refraction angle of light outside the paraxial region is pressed to be smaller, and the phenomenon that the light cannot be focused on a photosensitive region due to the fact that the light entrance angle of a main light ray is too large is avoided, so that an image becomes dark or changes color.
Further, the imaging lens satisfies the relation: 1.0< f/f16, which is used to define the ratio range between the focal length of the imaging lens and the combined focal length of the first lens to the sixth lens, facilitates optical optimization of the entire lens group while making the structure compact. Meanwhile, the imaging lens further satisfies the relation: 25.0< | f3|/CT3<35.0, which condition is used to limit the range of ratios between the focal length of the third lens and the center thickness of the third lens. When the ratio exceeds the upper limit of 35.0, the focal length value of the third lens is too large, the central thickness is too small, and the third lens has poor sensitivity and poor process forming conditions. When the ratio is lower than the lower limit of 25.0, it means that the focal length of the third lens is too small and the center thickness is too thick, which is also not favorable for process formation and sensitivity optimization of the whole imaging lens.
Further, the imaging lens satisfies the relation: 2.0< (CT4+ CT5+ CT6)/(AG45+ AG56) <8.0, the fourth lens, the fifth lens and the sixth lens in the rear half section can be effectively made to be more compact in structure, so that the total length of the imaging lens is shortened, and the miniaturization of the imaging lens is ensured.
Further, the sixth lens satisfies the relation: 2.0< R61/R62< -0.5, ensures the shape of a biconvex structure of the object side surface and the image side surface of the sixth lens at a paraxial region, is favorable for correcting aberrations such as astigmatic aberration, and the shape of the lens is easier to mold in the process. When R61/R62 is out of this range, the shape of the lens tends to become more curved, making molding difficult, and the incident light angle tends to be large, thereby affecting the image quality.
Further, a combined focal length f15 of the first to fifth lenses and a combined focal length f16 of the first to sixth lenses satisfy the relation: 1.0< f15/f16<2.0, and the range setting of the combined focal length ensures that the combined focal length is not too large or too small so as not to influence the imaging quality.
Preferably, the imaging lens further satisfies the following relation: 0.8< f26/f36< 2.0.
Further, the focal length of the imaging lens, the focal length of the sixth lens and the focal length of the seventh lens satisfy the relation: 10< (f + f6) (f + f7) <30, the reasonable configuration of the focal length of the imaging lens is ensured by adjusting the focal length relationship between the two lenses, the aberration influence caused by the deflection amount of the light rays can be controlled under the condition that TTL is reduced, and the imaging quality is improved.
Further, the distance LCT14 between the object-side surface of the first lens and the image-side surface of the fourth lens on the optical axis and the distance LCT26 between the object-side surface of the second lens and the image-side surface of the sixth lens on the optical axis satisfy the following relation: 0.4< LCT14/LCT26<1.0, so that the distance between different lenses is better controlled, and the structure design is more convenient.
Further, the center thickness and the edge thickness of the sixth lens satisfy the relation: 1.4< CT6/ET6< 2.2. Meanwhile, the object side surface of the third lens is of a concave structure, the image side surface of the third lens is of a convex structure, and the center thickness and the edge thickness of the third lens satisfy the relation: 0.4< CT3/ET3<0.8, and the lens meets better molding conditions by controlling the ratio of the thicknesses of different parts of the lens, thereby reducing the production cost.
Further, the curvature radii of the object-side surface and the image-side surface of the fourth lens satisfy the relation: 1.0< (R41+ R42)/(R41-R42) <1.6, can effectively control the shape of the fourth lens, is beneficial to the molding of the fourth lens, avoids the poor molding and stress generation caused by the overlarge surface curvature radius of the fourth lens, and simultaneously obtains the capability of balancing partial field curvature.
Preferably, the imaging lens further satisfies the following relation: -5.50< (f/R51+ f/R52) < -4.0.
The imaging lens provided by the embodiment of the invention is of a seven-lens type, is adapted to each electronic imaging module device, can effectively shorten the length of the imaging lens and improve the visual angle of the lens under the condition of maintaining high imaging quality by combining the surface shape structure of each lens of the seven-lens type imaging lens with the optimized range of optical parameters, has high resolution power brought by high pixels, and is used for providing a small or thin portable device needing equipment with high imaging quality, such as a mobile phone, a PDA, a computer, a camera, a driving recorder or a camera.
Furthermore, when the f-number Fno of the imaging lens is 2.0, the large aperture has the advantage of large aperture, which ensures sufficient light input amount, effectively improves the sensitivity, and ensures better imaging quality.
The imaging lens adopts a structure of seven aspheric lenses, has a proper surface type and higher-order aspheric coefficients, and effectively corrects various aberrations such as field curvature, astigmatism, chromatic aberration of magnification and the like. Meanwhile, the imaging lens has better thickness ratio and better sensitivity, improves the process yield and reduces the production cost.
The aspherical surface curve equation of each lens is as follows:
wherein X is a point on the aspheric surface which is Y away from the optical axis,the relative height of the optical axis and a tangent plane tangent to the vertex on the aspheric optical axis; r is a curvature radius; y is the vertical distance between a point on the aspheric curve and the optical axis; k is the cone coefficient; a. theiAre the i-th order aspheric coefficients.
Preferably, the lens material of the imaging lens is made of a plastic material, and the characteristic that the plastic material has precise die pressing is utilized, so that the mass production is realized, the processing cost of the imaging lens can be greatly reduced, the manufacturing cost of the imaging lens is greatly reduced, and the large-scale popularization is facilitated.
The embodiment of the invention also provides image acquisition equipment, which comprises the imaging lens. The image acquisition device can be various mobile terminals, photographic devices and the like, such as a mobile phone, a PDA, a computer, a camera, a vehicle recorder or a camera.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Four specific examples are as follows.
Example one
Referring to fig. 1, the imaging lens assembly of the present embodiment includes, in order from an object side to an image side, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, a sixth lens element 60, a seventh lens element 70, an ir-filter 80 and an image plane 90, where each lens element has an object-side surface facing the object side and passing imaging light therethrough and an image-side surface facing the image side and passing imaging light therethrough;
the first lens element 10 with positive refractive power has a convex object-side surface;
the second lens element 20 with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element 30 with refractive power;
the fourth lens element 40 with refractive power;
the fifth lens element 50 with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element 60 with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element 70 with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0。
it should be noted that, in the four specific embodiments in the present application, the object-side surface of the lens is a convex surface structure, which means that a tangent plane is made at any point on the object-side surface of the lens, the surface is always on the right of the tangent plane, the curvature radius of the surface is positive, otherwise, the object-side surface is a concave surface structure, and the curvature radius of the surface is negative; the image side surface is of a convex structure, namely that any point on the passing surface of the image side surface of the lens is made into a tangent plane, the surface is always positioned on the left side of the tangent plane, the curvature radius is negative, otherwise, the image side surface is of a concave structure, and the curvature radius is positive; if a section is made through any point on the object side surface or the image side surface of the lens, and the surface has a part on the left side of the section and a part on the right side of the section, the surface has a curve inflection point. In this case, the above rule is still applied to the judgment of the unevenness of the object side and the image side surface at the paraxial region.
The structural parameters of each lens are specifically shown in table 1.
The focal length f of the imaging lens is 4.84mm, the f-number Fno is 2.00, and the field angle FOV is 78.0 °. The unit of the radius of curvature, thickness, focal length in table 1 are all mm. Surfaces 0 to 18 in table 1 represent the respective surfaces from the object side to the image side in this order.
The aspherical surface coefficients of the lenses of this embodiment are specifically shown in table 2, and a2 to a16 represent aspherical surface coefficients of orders 2 to 16, respectively.
The values of the relational expressions in this example are shown in Table 3.
Graphs of astigmatism and distortion field and a graph of spherical aberration of the imaging lens of the present embodiment are shown in fig. 2 and 3, respectively.
Wherein the wavelengths of the astigmatism and distortion field graphs are 555nm, and the wavelengths of the spherical aberration graphs are 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm respectively.
Example two
Referring to fig. 4, the imaging lens assembly of the present embodiment includes, in order from an object side to an image side, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, a sixth lens element 60, a seventh lens element 70, an ir-filter 80 and an image plane 90, where each lens element has an object-side surface facing the object side and passing imaging light therethrough and an image-side surface facing the image side and passing imaging light therethrough;
the first lens element 10 with positive refractive power has a convex object-side surface;
the second lens element 20 with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element 30 with refractive power;
the fourth lens element 40 with refractive power;
the fifth lens element 50 with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element 60 with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element 70 with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0。
the structural parameters of each lens are specifically shown in table 4.
The focal length f of the imaging lens is 4.72mm, the f-number Fno is 2.00, and the field angle FOV is 78.0 °. The unit of the radius of curvature, thickness, focal length in table 4 are all mm. Surfaces 0 to 18 in table 4 represent the respective surfaces from the object side to the image side in this order.
The aspherical surface coefficients of the lenses of this embodiment are specifically shown in table 5, and a2 to a16 represent aspherical surface coefficients of orders 2 to 16, respectively.
The values of the respective relational expressions in this example are shown in table 6.
Graphs of astigmatism and distortion field and a graph of spherical aberration of the imaging lens of the present embodiment are shown in fig. 5 and 6, respectively.
Wherein the wavelengths of the astigmatism and distortion field graphs are 555nm, and the wavelengths of the spherical aberration graphs are 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm respectively.
EXAMPLE III
Referring to fig. 7, the imaging lens assembly of the present embodiment includes, in order from an object side to an image side, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, a sixth lens element 60, a seventh lens element 70, an ir-filter 80 and an image plane 90, where each lens element has an object-side surface facing the object side and passing imaging light therethrough and an image-side surface facing the image side and passing imaging light therethrough;
the first lens element 10 with positive refractive power has a convex object-side surface;
the second lens element 20 with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element 30 with refractive power;
the fourth lens element 40 with refractive power;
the fifth lens element 50 with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element 60 with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element 70 with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0。
the structural parameters of each lens are specifically shown in table 7.
The focal length f of the imaging lens is 4.78mm, the f-number Fno is 2.00, and the field angle FOV is 78.0 °. The unit of the radius of curvature, thickness, and focal length in table 7 are mm. Surfaces 0 to 18 in table 7 represent the respective surfaces from the object side to the image side in this order.
The aspherical surface coefficients of the lenses of this embodiment are specifically shown in table 8, and a2 to a16 represent aspherical surface coefficients of orders 2 to 16, respectively.
The values of the relational expressions in this example are shown in table 9.
Graphs of astigmatism and distortion field and a graph of spherical aberration of the imaging lens of the present embodiment are shown in fig. 8 and 9, respectively.
Wherein the wavelengths of the astigmatism and distortion field graphs are 555nm, and the wavelengths of the spherical aberration graphs are 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm respectively.
Example four
Referring to fig. 10, the imaging lens assembly of the present embodiment includes, in order from an object side to an image side, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, a sixth lens element 60, a seventh lens element 70, an ir-filter 80 and an image plane 90, where each lens element has an object-side surface facing the object side and passing imaging light therethrough and an image-side surface facing the image side and passing imaging light therethrough;
the first lens element 10 with positive refractive power has a convex object-side surface;
the second lens element 20 with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element 30 with refractive power;
the fourth lens element 40 with refractive power;
the fifth lens element 50 with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element 60 with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element 70 with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
25.0<|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0。
the structural parameters of each lens are specifically shown in table 10.
The focal length f of the imaging lens is 4.69mm, the f-number Fno is 2.04, and the field angle FOV is 81.8 °. The unit of the radius of curvature, thickness, and focal length in table 10 are mm. Surfaces 0 to 18 in table 10 represent the respective surfaces from the object side to the image side in this order.
The aspherical surface coefficients of the lenses of this embodiment are specifically shown in table 11, and a2 to a16 represent aspherical surface coefficients of orders 2 to 16, respectively.
The values of the relational expressions in this example are shown in table 12.
It should be noted that, unlike the previous three embodiments, the object-side surface of the third lens element 30 is convex at the paraxial region, and the image-side surface thereof is convex, and the second lens element 20 and the fifth lens element 50 are made of high refractive index materials.
Astigmatism, distortion field curve and spherical aberration curve of the imaging lens of the present embodiment are shown in fig. 11 and 12, respectively.
Wherein the wavelength of the astigmatism and distortion field graphs is 555nm, and the wavelength of the spherical aberration graphs is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm respectively.
Therefore, the imaging lens provided by the embodiment of the invention is of a seven-lens type, is adapted to each electronic imaging module device, and can effectively shorten the system length and improve the lens view angle under the condition of maintaining high imaging quality by combining the surface shape structure of each lens of the seven-lens type imaging lens with the optimization range of optical parameters, has high resolution power brought by high pixels, and is used for providing small or thin portable devices which need to be provided with high-order imaging quality, such as mobile phones, PDAs, computers, cameras, automobile data recorders or cameras.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. An imaging lens is characterized by comprising 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 in sequence, wherein each lens is provided with an object side surface facing to the object side and allowing imaging light rays to pass through and an image side surface facing to the image side and allowing the imaging light rays to pass through;
the first lens element with positive refractive power has a convex object-side surface;
the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the third lens element with refractive power;
the fourth lens element with refractive power;
the fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface;
the sixth lens element with positive refractive power has a convex object-side surface at paraxial region, at least one inflection point on the object-side surface, and a convex image-side surface;
the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region, and the image-side surface has at least one inflection point on an off-axis region;
the imaging lens satisfies the following relational expression:
1.0<f/f16；
27.0≤|f3|/CT3<35.0；
2.0<(CT4+CT5+CT6)/(AG45+AG56)<8.0；
wherein f is a focal length of the imaging lens, f16 is a combined focal length of the first lens to the sixth lens, f3 is a focal length of the third lens, CT3 is a central thickness of the third lens on an optical axis, CT4 is a central thickness of the fourth lens on the optical axis, CT5 is a central thickness of the fifth lens on the optical axis, CT6 is a central thickness of the sixth lens on the optical axis, AG45 is an air space between the fourth lens and the fifth lens on the optical axis, and AG56 is an air space between the fifth lens and the sixth lens on the optical axis.
2. The imaging lens assembly of claim 1, wherein the third lens element has a convex object-side surface at a paraxial region and a convex image-side surface.
3. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: -2.0< R61/R62< -0.5, wherein R61 is a radius of curvature of the object-side surface of the sixth lens, and R62 is a radius of curvature of the image-side surface of the sixth lens.
4. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: 1.0< f15/f16<2.0, wherein f15 is a combined focal length of the first to fifth lenses.
5. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: 0.8< f26/f36<2.0, where f26 is the combined focal length of the second to sixth lenses and f36 is the combined focal length of the third to sixth lenses.
6. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: 10< (f + f6) (f + f7) <30, wherein f6 is the focal length of the sixth lens and f7 is the focal length of the seventh lens.
7. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: 0.4< LCT14/LCT26<1.0, where LCT14 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens and LCT26 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the sixth lens.
8. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: 1.4< CT6/ET6<2.2, wherein ET6 is the edge thickness of the sixth lens.
9. The imaging lens assembly as claimed in claim 1, wherein the object-side surface of the third lens element has a concave structure, the image-side surface of the third lens element has a convex structure, and further satisfies the following relation: 0.4< CT3/ET3<0.8, wherein ET3 is the edge thickness of the third lens.
10. An imaging lens according to claim 9, characterized in that the following relation is also satisfied: 1.0< (R41+ R42)/(R41-R42) <1.6, wherein R41 is a radius of curvature of the object-side surface of the fourth lens, and R42 is a radius of curvature of the image-side surface of the fourth lens.
11. An imaging lens according to claim 1, characterized in that the following relation is also satisfied: -5.50< (f/R51+ f/R52) < -4.0, wherein R51 is a radius of curvature of the object-side surface of the fifth lens, and R52 is a radius of curvature of the image-side surface of the fifth lens.
12. An image pickup apparatus characterized by comprising the imaging lens according to any one of claims 1 to 11.
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| CN109254385B (en) * | 2018-10-30 | 2024-05-03 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN111175932A (en) * | 2019-01-17 | 2020-05-19 | 惠州市星聚宇光学有限公司 | Optical lens group |
| JP6882838B2 (en) | 2019-03-07 | 2021-06-02 | カンタツ株式会社 | Imaging lens |
| CN110376720B (en) * | 2019-08-19 | 2024-04-26 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN111458850B (en) * | 2020-06-16 | 2020-09-15 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN112269249B (en) * | 2020-12-24 | 2021-03-23 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
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