CN109375351B - Camera lens group and electronic equipment - Google Patents
Camera lens group and electronic equipment Download PDFInfo
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- CN109375351B CN109375351B CN201811604845.6A CN201811604845A CN109375351B CN 109375351 B CN109375351 B CN 109375351B CN 201811604845 A CN201811604845 A CN 201811604845A CN 109375351 B CN109375351 B CN 109375351B
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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 a camera lens group which is of a seven-lens type lens structure, wherein a first lens element and a seventh lens element both have negative refractive power, a second lens element and a sixth lens element both have positive refractive power, the object-side surface of the first lens element is convex at a paraxial region, the image-side surface of the fourth lens element is concave at the paraxial region, the object-side surface of the fifth lens element is concave at the paraxial region, and the image-side surface of the seventh lens element is concave at the paraxial region. By reasonably defining the ratio of the distance between the first lens element and the second lens element on the optical axis to the distance between the fifth lens element and the sixth lens element on the optical axis, the spatial arrangement of the lens elements can be balanced to improve the degree of matching between the lens elements on the object side and to ensure that the lens elements on the image side have enough space to accommodate aberrations. The camera lens group can have the characteristics of large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality, and meets the application requirements. The invention also discloses an electronic device.
Description
Technical Field
The invention relates to the technical field of optical imaging devices, in particular to a camera lens group. The invention also relates to an electronic device.
Background
With the rapid update of related consumer electronics products such as smart phones, portable computers, tablet devices and the like, the market has higher and higher requirements for the quality of optical imaging lenses of electronic products. With the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced, and accordingly, the image pickup lens group has been gradually developed in the field of high pixels, and thus the requirements for the imaging quality thereof have been increasingly increased.
The traditional lens mounted on a portable product mostly adopts a three-piece or four-piece lens structure, and with the continuous rising of the requirements of the market on the pixel and the imaging quality of the lens, the existing optical camera lens cannot meet the requirement of a higher-order photographic system. With the development of technology and the increasing demand of diversified users, five-lens, six-lens and seven-lens structures are gradually emerging in the design of camera lens sets for better imaging quality. On the other hand, a large aperture characteristic is one of the currently indispensable elements for providing sufficient illuminance to the image plane of the imaging lens group. Therefore, there is a need for an imaging lens assembly with a large aperture and excellent optical characteristics.
Disclosure of Invention
The invention aims to provide an image pickup lens group which has the characteristics of large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality and meets the application requirements. The invention also provides electronic equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
a photographing lens assembly includes, in order from an object side to an image side, 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 having an object-side surface facing an object side and an image-side surface facing an image side, wherein:
the first lens element and the seventh lens element have negative refractive power, the second lens element and the sixth lens element have positive refractive power, the object-side surface of the first lens element is convex at a paraxial region, the image-side surface of the fourth lens element is concave at a paraxial region, the object-side surface of the fifth lens element is concave at a paraxial region, and the image-side surface of the seventh lens element is concave at a paraxial region;
and satisfies the following conditional expressions:
0.2<T12/T56<2；
wherein, T12Represents the distance T from the image side surface of the first lens to the object side surface of the second lens on the optical axis56And the distance from the image side surface of the fifth lens to the object side surface of the sixth lens on the optical axis is represented.
Preferably, the following conditional formula is also satisfied: 0<YC42/YC72<0.9 wherein Yc42Represents the vertical distance Yc from the point of inflection of the image-side surface of the fourth lens to the optical axis72And the vertical distance from the inflection point of the image side surface of the seventh lens to the optical axis is represented.
Preferably, the following conditional formula is also satisfied: f/EPD is less than or equal to 1.80, wherein f represents the focal length of the shooting lens group, and EPD represents the entrance pupil diameter of the shooting lens group.
Preferably, the following conditional formula is also satisfied: 0.5<CT4/CT6<2.5, wherein CT4Represents the thickness of the fourth lens on the optical axis, CT6Represents the thickness of the sixth lens on the optical axis.
Preferably, the following conditional formula is also satisfied: -10<f1/f<-1, wherein f1Denotes a focal length of the first lens, and f denotes a focal length of the image pickup lens group.
Preferably, the following conditional formula is also satisfied: 0<f/R72<5, where f denotes a focal length of the image pickup lens group, R72Represents a radius of curvature of the image side surface of the seventh lens.
Preferably, the following conditional formula is also satisfied: -2<R32/R31<1, wherein R32Represents a radius of curvature, R, of the image-side surface of the third lens31Representing a radius of curvature of an object-side surface of the third lens.
Preferably, the following conditional formula is also satisfied: -2<(R61+R62)/(R61-R62) 2 or less, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Represents a radius of curvature of the image-side surface of the sixth lens element.
Preferably, the following conditional formula is also satisfied: 0.1<T23/(CT2+CT3) Less than or equal to 0.5, wherein T is23Represents the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, CT2Representing the thickness of said second lens on the optical axis, CT3Represents the thickness of the third lens on the optical axis.
An electronic apparatus includes an image pickup device including an electron photosensitive element and the above-described image pickup lens group, the electron photosensitive element being provided on an imaging surface of the image pickup lens group.
In view of the above technical solutions, an image capturing lens assembly provided by the present invention includes 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, which are sequentially disposed from an object side to an image side along an optical axis, and an object light sequentially passes through the respective lens elements to be imaged on an imaging surface located at the image side of the seventh lens element. The photographing lens group is of a seven-piece lens structure, wherein the space configuration of the photographing lens group can be balanced by reasonably limiting the ratio of the spacing distance between the first lens and the second lens on the optical axis to the spacing distance between the fifth lens and the sixth lens on the optical axis, so that the degree of matching between the object side lenses of the photographing lens group is improved, and the image side lenses have enough space to accommodate aberration. The camera lens group provided by the invention has the characteristics of large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality, and meets the application requirements.
The electronic equipment provided by the invention can achieve the beneficial effects.
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, 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 the drawings without creative efforts.
Fig. 1 is a schematic view of an image pickup lens group provided in embodiment 1 of the present invention;
FIG. 2 is a distortion field diagram of the photographing lens group in embodiment 1 of the present invention;
FIG. 3 is a spherical aberration chart of the photographing lens assembly in example 1 of the present invention;
fig. 4 is a schematic view of an image pickup lens assembly provided in embodiment 2 of the present invention;
FIG. 5 is a distortion field diagram of the photographing lens group in embodiment 2 of the present invention;
FIG. 6 is a spherical aberration chart of the photographing lens assembly in example 2 of the present invention;
fig. 7 is a schematic view of an image pickup lens assembly provided in embodiment 3 of the present invention;
FIG. 8 is a distortion curvature diagram of the photographing lens group in embodiment 3 of the present invention;
FIG. 9 is a spherical aberration chart of the photographing lens assembly in embodiment 3 of the present invention;
fig. 10 is a schematic view of an image pickup lens group provided in embodiment 4 of the present invention;
FIG. 11 is a distortion curvature diagram of the photographing lens group in embodiment 4 of the present invention;
FIG. 12 is a spherical aberration chart of the photographing lens assembly in example 4 of the present invention;
fig. 13 is a schematic view of an image pickup lens assembly provided in embodiment 5 of the present invention;
FIG. 14 is a distortion field diagram of the photographing lens group in embodiment 5 of the present invention;
FIG. 15 is a spherical aberration chart of the photographing lens assembly in example 5 of the present invention;
fig. 16 is a schematic view of an image pickup lens group provided in embodiment 6 of the present invention;
FIG. 17 is a distortion curvature diagram of the photographing lens group in embodiment 6 of the present invention;
FIG. 18 is a spherical aberration chart of the photographing lens assembly in example 6 of the present invention;
fig. 19 is a schematic view of an image pickup lens group provided in embodiment 7 of the present invention;
FIG. 20 is a distortion curvature diagram of the photographing lens group in embodiment 7 of the present invention;
FIG. 21 is a spherical aberration chart of the photographing lens assembly in example 7 of the present invention;
fig. 22 is a schematic view of an image pickup lens group provided in embodiment 8 of the present invention;
FIG. 23 is a distortion curvature diagram of the photographing lens group in embodiment 8 of the present invention;
FIG. 24 is a spherical aberration chart of the photographing lens assembly in example 8 of the present invention;
FIG. 25 shows Yc of an image capturing lens assembly according to embodiment 1 of the present invention42A schematic diagram of (a);
FIG. 26 shows Yc of an image capturing lens assembly according to embodiment 1 of the present invention72Schematic representation of (a).
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
The invention provides a camera lens group, 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 each lens is provided with an object side surface facing an object space and an image side surface facing an image space, the camera lens group also comprises an imaging surface positioned at the image side of the seventh lens and an infrared filter arranged between the seventh lens and the imaging surface, and the infrared filter does not influence the focal length of the camera lens group.
The first lens element with negative refractive power has a meniscus shape when viewed from the side, and a convex object-side surface, and the shape and refractive power strength of the first lens element can be properly adjusted to increase the angle of view of the image capturing lens assembly.
The second lens element with positive refractive power has a refractive power stronger than that of the first lens element, and can effectively suppress the back focal length of the image capturing lens assembly, thereby preventing the back focal length of the lens assembly from being too long due to the negative refractive power of the first lens element. Meanwhile, the object side surface of the second lens can be a convex surface, so that the aberration and distortion of the shooting lens group can be eliminated.
The fourth lens element with positive refractive power can be used in combination with the positive refractive power of the second lens element to improve the sensitivity of the image capturing lens assembly and further improve the yield. The object side surface of the fourth lens element can be convex at the paraxial region, so that spherical aberration can be corrected, and the imaging quality can be effectively improved. In addition, the image-side surface of the fourth lens element can be concave at the paraxial region and can include at least one inflection point for correcting off-axis aberrations.
The fifth lens element with refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is effective for correcting astigmatism of the photographing lens assembly and improving resolution to obtain good image quality.
The sixth lens element with positive refractive power can enhance the converging ability of the image side end of the image capturing lens assembly, thereby facilitating the expansion of the viewing angle and being suitable for various electronic devices. Preferably, the image-side surface of the sixth lens element may be convex at a paraxial region thereof, so as to effectively share the converging power of the third lens element and prevent the single lens element from being deteriorated in manufacturability due to excessive curvature of the surface thereof.
The seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface, which is helpful for making the principal point of the image capturing lens assembly effectively away from the image plane, so as to shorten the back focal length thereof, reduce the total length of the image capturing lens assembly, and achieve the purpose of miniaturization; in addition, the image side surface of the seventh lens element changes from concave to convex from paraxial to peripheral and has a point of inflection, which effectively suppresses the angle of incidence of the light rays of the off-axis field on the image sensor, and preferably corrects the aberration of the off-axis field.
Through the positive and negative distribution of the refractive power of each lens in the lens group, the low-order aberration of the lens group can be effectively balanced and controlled, the tolerance sensitivity of the system can be reduced, and the miniaturization of the camera lens group is favorably ensured. The interval can be respectively arranged between any two adjacent lenses of the camera lens group, which is beneficial to the assembly of the lenses and improves the manufacturing yield.
In addition, the camera lens group satisfies the condition 0.2<T12/T56<2, wherein T12Represents the distance T from the image side surface of the first lens to the object side surface of the second lens on the optical axis56The distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element on the optical axis is represented, the ratio of the distance between the first lens element and the second lens element on the optical axis to the distance between the fifth lens element and the sixth lens element on the optical axis is reasonably limited, the spatial configuration of the image capturing lens assembly can be balanced, the degree of matching between the object side lens elements is improved, and enough space is provided between the image side lens elementsTo accommodate aberrations. The camera lens group provided by the invention has the characteristics of large aperture, high pixel, high resolution, large field angle and the like, can provide good imaging quality, and meets the application requirements.
Preferably, the present imaging lens group further satisfies the following conditional expressions: 0<YC42/YC72<0.9 wherein Yc42Represents the vertical distance Yc from the point of inflection of the image-side surface of the fourth lens to the optical axis72And the vertical distance from the inflection point of the image side surface of the seventh lens to the optical axis is represented. Through optimizing the shape of face of fourth lens and seventh lens, can promote the light height of the lens group of making a video recording effectively, satisfy the requirement of the high pixel of imaging system, and make light deflection tend to alleviate, can effectively reduce the sensitivity of the lens group of making a video recording, can effectively revise the coma, distortion and the colour difference of the lens group of making a video recording simultaneously.
Preferably, the present imaging lens group further satisfies the following conditional expressions: f/EPD is less than or equal to 1.80, wherein f represents the focal length of the shooting lens group, and EPD represents the entrance pupil diameter of the shooting lens group. Therefore, the size of the aperture of the camera lens group can be properly configured, so that the camera lens group with the large aperture can still adopt higher shutter speed to shoot clear images when the light is insufficient. Preferably, it satisfies the following conditions: f/EPD is less than or equal to 1.50.
Preferably, the present imaging lens group further satisfies the following conditional expressions: 0.5<CT4/CT6<2.5, wherein CT4Represents the thickness of the fourth lens on the optical axis, CT6Represents the thickness of the sixth lens on the optical axis. Satisfying this condition helps avoiding the stray light from affecting the imaging due to the curved configuration of the fourth lens shape, helps reducing noise and improves the imaging quality. In addition, the fourth lens can be ensured to have enough thickness to control the light path direction of the shooting lens group, so that the imaging quality is good.
Preferably, the present imaging lens group further satisfies the following conditional expressions: -10<f1/f<-1, wherein f1Denotes a focal length of the first lens, and f denotes a focal length of the image pickup lens group. By rationally controlling the negative power of the first lens, the contribution of the first lens is rationally controlledThe negative third-order spherical aberration and the positive fifth-order spherical aberration are generated by the first lens, so that the negative third-order spherical aberration and the positive fifth-order spherical aberration contributed by the first lens can be mutually offset with the positive third-order spherical aberration and the negative fifth-order spherical aberration generated by each positive lens (namely, each lens with positive refractive power between the first lens and the imaging surface) behind the first lens, and the on-axis view field is ensured to have good imaging quality.
Preferably, the present imaging lens group further satisfies the following conditional expressions: 0<f/R72<5, where f denotes a focal length of the image pickup lens group, R72Represents a radius of curvature of the image side surface of the seventh lens. Therefore, the curvature of the image side surface of the seventh lens is adjusted, the principal point of the shooting lens group is facilitated to be far away from the imaging surface, the back focal length of the shooting lens group is shortened, and the miniaturization of the shooting lens group is maintained.
Preferably, the present imaging lens group further satisfies the following conditional expressions: -2<R32/R31<1, wherein R32Represents a radius of curvature, R, of the image-side surface of the third lens31Representing a radius of curvature of an object-side surface of the third lens. Therefore, the aberration generated by the second lens element with stronger refractive power can be corrected.
Preferably, the present imaging lens group further satisfies the following conditional expressions: -2<(R61+R62)/(R61-R62) 2 or less, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Represents a radius of curvature of the image-side surface of the sixth lens element. When this condition is satisfied, the surface shape of the sixth lens element can be appropriately adjusted, and astigmatism of the imaging lens group can be further corrected.
Preferably, the present imaging lens group further satisfies the following conditional expressions: 0.1<T23/(CT2+CT3) Less than or equal to 0.5, wherein T is23Represents the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, CT2Representing the thickness of said second lens on the optical axis, CT3Represents the thickness of the third lens on the optical axis. Satisfying this condition can avoid the difficulty in molding and assembling due to the large distance between the thinner second lens and the thinner third lens.
It should be noted that the refractive power refers to the refractive power of the optical system for reflecting the incident parallel light beam. The optical system has positive refractive power, which indicates that the refraction of the light rays is convergent; the optical system has negative refractive power, indicating that the refraction of light is divergent. In the image capturing lens assembly of the present invention, if the refractive power or the focal length of the lens element does not define the position of the area, the refractive power or the focal length of the lens element can be the refractive power or the focal length of the lens element at the paraxial region.
For each lens arrangement in the image capturing lens group, in a case of proceeding from left to right from the object side to the image side, a convex object side of the lens means that any point on the object side of the lens is tangent, the surface is always on the right of the tangent plane, the curvature radius is positive, otherwise, the object side is concave, and the curvature radius is negative. The image side surface of the lens is convex, which means that any point on the passing surface of the image side surface of the lens is tangent, the surface is always on the left side of the tangent plane, the curvature radius is negative, otherwise, the image side surface is concave, and the curvature radius is positive. If a section is made through any point on the object-side or image-side surface of the lens, the surface has both a portion to the left of the section and a portion to the right of the section, and the surface has points of inflection. The above applies to the determination of the presence of irregularities at the paraxial region of the object-side surface and the image-side surface of the lens. The paraxial region refers to a region near the optical axis. In the photographing lens assembly of the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, it means that the convex surface can be positioned at the position of the lens surface close to the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis.
In the camera lens group disclosed by the invention, the lenses are made of materials with high light transmittance and excellent machinability, for example, the lenses are made of plastics, so that the manufacturing and forming of the lenses are facilitated, the manufacturing yield is improved, the material meeting the condition is low in cost and easy to obtain, and the production cost is reduced. In addition, the object side surface and the image side surface of each lens can be an Aspheric Surface (ASP), the ASP can be easily made into shapes other than a spherical surface, more control variables are obtained for reducing the aberration, and the number of the lenses is further reduced, so that the total length of the photographing lens group can be effectively reduced.
In addition, in the camera lens group, at least one diaphragm can be arranged according to requirements so as to reduce stray light and be beneficial to improving the imaging quality. In the present invention, the aperture configuration may be a mid-stop, i.e. the aperture is disposed between the first lens and the imaging surface, which helps to enlarge the field angle of the system, so that the image capturing lens group has the advantages of a wide-angle lens.
The following describes the imaging lens assembly of the present invention in detail with specific examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
[ example 1 ]
Referring to fig. 1, a schematic view of the configuration of an image pickup lens group of embodiment 1 is shown. As can be seen from the figure, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 110, a second lens element 120, an aperture stop 100, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, and a seventh lens element 170, where each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 110 with negative refractive power has a convex object-side surface 111 at a paraxial region and a concave image-side surface 112 at a paraxial region. The second lens element 120 with positive refractive power has a convex object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region. The third lens element 130 with negative refractive power has a concave object-side surface 131 at a paraxial region and a concave image-side surface 132 at a paraxial region. The fourth lens element 140 with positive refractive power has a convex object-side surface 141 at a paraxial region and a concave image-side surface 142 at a paraxial region, and has at least one inflection point on the image-side surface. The fifth lens element 150 with negative refractive power has a concave object-side surface 151 at a paraxial region and a convex image-side surface 152 at a paraxial region. The sixth lens element 160 with positive refractive power has a convex object-side surface 161 at a paraxial region and a convex image-side surface 162 at a paraxial region. The seventh lens element 170 with negative refractive power has a concave object-side surface 171 at a paraxial region and a concave image-side surface 172 at a paraxial region, and the image-side surface includes at least one inflection point. In addition, the camera lens assembly further includes an infrared filter 180 disposed between the seventh lens 170 and the image plane 190, and the infrared filter 180 filters out infrared band light entering the camera lens assembly to prevent infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the imaging lens group of the present embodiment satisfying the conditional expressions are shown in table 9. In addition, referring to fig. 25 and 26, the vertical distance Yc from the inflection point 1421 on the image-side surface of the fourth lens element 140 to the optical axis42As shown in FIG. 25, the vertical distance Yc from the inflection point 1721 on the image-side surface of the seventh lens 170 to the optical axis72As shown in fig. 26.
The detailed optical data of embodiment 1 are shown in table 1-1, where the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the image capturing lens assembly, Fno is the aperture value, FOV is the maximum field angle, and surfaces 0-18 sequentially represent the surfaces from the object side to the image side. Surfaces 1-15 sequentially represent a first lens object-side surface 111, a first lens image-side surface 112, a second lens object-side surface 121, a second lens image-side surface 122, an aperture stop 100, a third lens object-side surface 131, a third lens image-side surface 132, a fourth lens object-side surface 141, a fourth lens image-side surface 142, a fifth lens object-side surface 151, a fifth lens image-side surface 152, a sixth lens object-side surface 161, a sixth lens image-side surface 162, a seventh lens object-side surface 171, and a seventh lens image-side surface 172.
TABLE 1-1
Each lens in the camera lens group adopts aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
wherein X represents a point on the aspheric surface at a distance Y from the optical axis, which is the phase ofThe relative distance of the tangent plane of the vertex cut on the aspheric optical axis; r represents a radius of curvature; y represents a perpendicular distance between a point on the aspherical curve and the optical axis; k represents a conic coefficient; ai represents the i-th order aspheric coefficients.
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 1-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A16 represent the aspherical surface coefficients of 4 th to 16 th orders, respectively. Distortion field curves of the image-capturing lens assembly of this embodiment, in which the wavelength is 0.555 μm, and spherical aberration curves of the image-capturing lens assembly of this embodiment, in which the wavelength is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm, are shown in fig. 2 and 3, respectively. In addition, the following tables of the embodiments correspond to the schematic diagrams of the imaging lens assembly, the distortion field curvature and the spherical aberration curve chart of the embodiments, and the data in the tables are defined as the same as those in tables 1-1 and 1-2 of embodiment 1.
Tables 1 to 2
[ example 2 ]
Referring to fig. 4, a schematic view of the configuration of an image pickup lens group of embodiment 2 is shown. As can be seen from the figure, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 210, a second lens element 220, an aperture stop 200, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, and a seventh lens element 270, where each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 210 with negative refractive power has a convex object-side surface 211 at a paraxial region and a concave image-side surface 212 at a paraxial region. The second lens element 220 with positive refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region. The third lens element 230 with negative refractive power has a concave object-side surface 231 at a paraxial region and a concave image-side surface 232 at a paraxial region. The fourth lens element 240 with positive refractive power has a convex object-side surface 241 at a paraxial region and a concave image-side surface 242 at a paraxial region, and the image-side surface includes at least one inflection point. The fifth lens element 250 with negative refractive power has a concave object-side surface 251 and a convex image-side surface 252. The sixth lens element 260 with positive refractive power has a convex object-side surface 261 and a convex image-side surface 262 at a paraxial region. The seventh lens element 270 with negative refractive power has a concave object-side surface 271 with a paraxial region and a concave image-side surface 272 with a paraxial region, and has at least one inflection point on the image-side surface. In addition, the image capturing lens assembly further includes an infrared filter 280 disposed between the seventh lens element 270 and the image plane 290, and the infrared filter 280 filters infrared band light entering the image capturing lens assembly to prevent infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 2-1, Table 2-2 and Table 9. The corresponding distortion field curves and spherical aberration plots are shown in fig. 5 and 6, respectively.
TABLE 2-1
Tables 2 to 2
[ example 3 ]
Referring to fig. 7, a schematic view of a configuration of an image pickup lens group of embodiment 3 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 310, a second lens element 320, an aperture stop 300, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360 and a seventh lens element 370, where each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 310 with negative refractive power has a convex object-side surface 311 at a paraxial region and a concave image-side surface 312 at a paraxial region. The second lens element 320 with positive refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region. The third lens element 330 with positive refractive power has a concave object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region. The fourth lens element 340 with positive refractive power has a convex object-side surface 341 at a paraxial region and a concave image-side surface 342 at a paraxial region, and has at least one inflection point on the image-side surface. The fifth lens element 350 with negative refractive power has a concave object-side surface 351 at a paraxial region and a convex image-side surface 352 at a paraxial region. The sixth lens element 360 with positive refractive power has a convex object-side surface 361 at a paraxial region and a convex image-side surface 362 at a paraxial region. The seventh lens element 370 with negative refractive power has a concave object-side surface 371 at a paraxial region and a concave image-side surface 372 at a paraxial region, and the image-side surface includes at least one inflection point. In addition, the image capturing lens assembly further includes an infrared filter 380 disposed between the seventh lens element 370 and the image plane 390, and the infrared filter 380 filters the infrared band light entering the image capturing lens assembly to prevent the infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 3-1, Table 3-2 and Table 9. The corresponding distortion field curves and spherical aberration plots are shown in fig. 8 and 9, respectively.
TABLE 3-1
TABLE 3-2
[ example 4 ]
Referring to fig. 10, a schematic view of a configuration of an image pickup lens group of embodiment 4 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 410, a second lens 420, an aperture stop 400, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470, wherein each lens has an object side surface facing an object side and an image side surface facing an image side, and the object side surface and the image side surface of each lens are aspheric.
The first lens element 410 with negative refractive power has a convex object-side surface 411 and a concave image-side surface 412 at a paraxial region. The second lens element 420 with positive refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region. The third lens element 430 with negative refractive power has a concave object-side surface 431 at a paraxial region and a concave image-side surface 432 at a paraxial region. The fourth lens element 440 with positive refractive power has a convex object-side surface 441 at a paraxial region and a concave image-side surface 442 at a paraxial region, and the image-side surface thereof includes at least one inflection point. The fifth lens element 450 with positive refractive power has a concave object-side surface 451 at a paraxial region and a convex image-side surface 452 at a paraxial region. The sixth lens element 460 with positive refractive power has a concave object-side surface 461 and a convex image-side surface 462 at a paraxial region. The seventh lens element 470 with negative refractive power has a concave object-side surface 471 at a paraxial region, a concave image-side surface 472 at a paraxial region, and at least one inflection point on the image-side surface. In addition, the image capturing lens assembly further includes an infrared filter 480 disposed between the seventh lens element 470 and the image plane 490, and the infrared filter 480 filters the infrared band light entering the image capturing lens assembly to prevent the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 4-1, Table 4-2 and Table 9. The corresponding distortion plots and spherical aberration plots are shown in fig. 11 and 12, respectively.
TABLE 4-1
TABLE 4-2
[ example 5 ]
Referring to fig. 13, a schematic view of a configuration of an image pickup lens group of embodiment 5 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 510, a second lens 520, an aperture stop 500, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventh lens 570, each lens having an object side surface facing an object side and an image side surface facing an image side, and the object side surface and the image side surface of each lens are aspheric.
The first lens element 510 with negative refractive power has a convex object-side surface 511 at a paraxial region and a concave image-side surface 512 at a paraxial region. The second lens element 520 with positive refractive power has a convex object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region. The third lens element 530 with negative refractive power has a convex object-side surface 531 at a paraxial region and a concave image-side surface 532 at a paraxial region. The fourth lens element 540 with positive refractive power has a convex object-side surface 541 at a paraxial region and a concave image-side surface 542 at a paraxial region, and has at least one inflection point on the image-side surface. The fifth lens element 550 with negative refractive power has a concave object-side surface 551 at paraxial region and a convex image-side surface 552 at paraxial region. The sixth lens element 560 with positive refractive power has a convex object-side surface 561 at a paraxial region and a convex image-side surface 562 at a paraxial region. The seventh lens element 570 with negative refractive power has a concave object-side surface 571 at a paraxial region and a concave image-side surface 572 at a paraxial region, and the image-side surface has at least one inflection point. In addition, the image capturing lens assembly further includes an infrared filter 580 disposed between the seventh lens element 570 and the image plane 590, and the infrared filter 580 filters out the infrared band light entering the image capturing lens assembly, so as to prevent the infrared light from irradiating the photo sensor chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 5-1, Table 5-2 and Table 9. The corresponding distortion plots and spherical aberration plots are shown in fig. 14 and 15, respectively.
TABLE 5-1
TABLE 5-2
[ example 6 ]
Referring to fig. 16, a schematic view of a configuration of an image pickup lens group of embodiment 6 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 610, a second lens 620, an aperture stop 600, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, and a seventh lens 670, where each lens has an object side surface facing an object side and an image side surface facing an image side, and both the object side surface and the image side surface of each lens are aspheric.
The first lens element 610 with negative refractive power has a convex object-side surface 611 at a paraxial region and a concave image-side surface 612 at a paraxial region. The second lens element 620 with positive refractive power has a convex object-side surface 621 at a paraxial region and a concave image-side surface 622 at a paraxial region. The third lens element 630 with negative refractive power has a concave object-side surface 631 and a concave image-side surface 632 at a paraxial region. The fourth lens element 640 with positive refractive power has a convex object-side surface 641 at a paraxial region and a concave image-side surface 642 at a paraxial region, and the image-side surface thereof includes at least one inflection point. The fifth lens element 650 with negative refractive power has a concave object-side surface 651 at a paraxial region and a convex image-side surface 652 at a paraxial region. The sixth lens element 660 with positive refractive power has a convex object-side surface 661 at a paraxial region and a concave image-side surface 662 at a paraxial region. The seventh lens element 670 with negative refractive power has a concave object-side surface 671 at a paraxial region, a concave image-side surface 672 at a paraxial region, and at least one inflection point on the image-side surface. In addition, the camera lens assembly further includes an infrared filter 680 disposed between the seventh lens 670 and the image plane 690, and the infrared filter 680 filters the infrared band light entering the camera lens assembly to prevent the infrared light from irradiating the photo sensor chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 6-1, Table 6-2 and Table 9. The corresponding distortion field curves and spherical aberration plots are shown in fig. 17 and 18, respectively.
TABLE 6-1
TABLE 6-2
[ example 7 ]
Referring to fig. 19, a schematic view of a configuration of an image pickup lens group of embodiment 7 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 710, a second lens 720, an aperture stop 700, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760 and a seventh lens 770, where each lens has an object side surface facing an object side and an image side surface facing an image side, and both the object side surface and the image side surface of each lens are aspheric.
The first lens element 710 with negative refractive power has a convex object-side surface 711 at a paraxial region and a concave image-side surface 712 at a paraxial region. The second lens element 720 with positive refractive power has a convex object-side surface 721 at a paraxial region and a concave image-side surface 722 at a paraxial region. The third lens element 730 with negative refractive power has a concave object-side surface 731 at a paraxial region and a concave image-side surface 732 at a paraxial region. The fourth lens element 740 with positive refractive power has a convex object-side surface 741 at a paraxial region, a concave image-side surface 742 at a paraxial region, and at least one inflection point on the image-side surface. The fifth lens element 750 with negative refractive power has a concave object-side surface 751 at a paraxial region and a convex image-side surface 752 at a paraxial region. The sixth lens element 760 with positive refractive power has a convex object-side surface 761 at a paraxial region and a convex image-side surface 762 at a paraxial region. The seventh lens element 770 with negative refractive power has a concave object-side surface 771 at paraxial region, a concave image-side surface 772 at paraxial region, and at least one inflection point on the image-side surface. In addition, the camera lens assembly further includes an infrared filter 780 disposed between the seventh lens 770 and the image plane 790, and the infrared filter 780 filters the infrared band light entering the camera lens assembly to prevent the infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 7-1, Table 7-2 and Table 9. The corresponding distortion plots and spherical aberration plots are shown in fig. 20 and 21, respectively.
TABLE 7-1
TABLE 7-2
[ example 8 ]
Referring to fig. 22, a schematic view of a configuration of an image pickup lens group of embodiment 8 is shown. As can be seen, the image capturing lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 810, a second lens 820, an aperture stop 800, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, and a seventh lens 870, each of which has an object side surface facing an object side and an image side surface facing an image side, and each of the object side surface and the image side surface of each of the lenses is aspheric.
The first lens element 810 with negative refractive power has a convex object-side surface 811 at a paraxial region and a concave image-side surface 812 at a paraxial region. The second lens element 820 with positive refractive power has a convex object-side surface 821 at a paraxial region and a concave image-side surface 822 at a paraxial region. The third lens element 830 with negative refractive power has a concave object-side surface 831 at a paraxial region and a concave image-side surface 832 at a paraxial region. The fourth lens element 840 with positive refractive power has a convex object-side surface 841 at a paraxial region and a concave image-side surface 842 at a paraxial region, and the image-side surface includes at least one inflection point. The fifth lens element 850 with negative refractive power has a concave object-side surface 851 at a paraxial region and a convex image-side surface 852 at a paraxial region. The sixth lens element 860 with positive refractive power has a convex object-side surface 861 at a paraxial region and a convex image-side surface 862 at a paraxial region. The seventh lens element 870 with negative refractive power has a concave object-side surface 871 at a paraxial region and a concave image-side surface 872 at a paraxial region, wherein the image-side surface includes at least one inflection point. In addition, the image capturing lens assembly further includes an infrared filter 880 disposed between the seventh lens 870 and the image plane 890, and the infrared filter 880 filters out infrared band light entering the image capturing lens assembly to prevent infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 8-1, Table 8-2 and Table 9. The corresponding distortion plots and spherical aberration plots are shown in fig. 23 and 24, respectively.
TABLE 8-1
TABLE 8-2
In summary, examples 1 to 8 satisfy the relationships shown in table 9, respectively.
Correspondingly, the embodiment of the invention also provides electronic equipment which comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and the image pickup lens group, and the electronic photosensitive element is arranged on an imaging surface of the image pickup lens group.
In the electronic device provided in this embodiment, the image capturing lens assembly adopted by the image capturing apparatus is of a seven-piece lens structure, and the spatial configuration of the image capturing lens assembly can be balanced by reasonably limiting the ratio of the distance between the first lens and the second lens on the optical axis to the distance between the fifth lens and the sixth lens on the optical axis, so as to improve the degree of matching between the lenses at the object sides, and enable the lenses at the image sides to have a sufficient distance to accommodate aberrations.
The above provides a detailed description of an imaging lens assembly and an electronic device according to the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A photographing lens assembly comprising seven lens elements, in order from an object side to an image side, 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 lens element having an object side surface facing the object side and an image side surface facing the image side, wherein:
the first lens element and the seventh lens element have negative refractive power, the second lens element and the sixth lens element have positive refractive power, the fourth lens element has positive refractive power, the object-side surface of the first lens element is convex at a paraxial region, the image-side surface of the fourth lens element is concave at a paraxial region, the object-side surface of the fifth lens element is concave at a paraxial region, and the image-side surface of the seventh lens element is concave at a paraxial region;
and satisfies the following conditional expressions:
0.2<T12/T56<2；
wherein, T12Represents the distance T from the image side surface of the first lens to the object side surface of the second lens on the optical axis56The distance between the image side surface of the fifth lens and the object side surface of the sixth lens on the optical axis is represented;
the following conditional expressions are also satisfied: -2<(R61+R62)/(R61-R62) 2 or less, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Represents a radius of curvature of the image-side surface of the sixth lens element.
2. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0<YC42/YC72<0.9 wherein Yc42Represents the vertical distance Yc from the point of inflection of the image-side surface of the fourth lens to the optical axis72And the vertical distance from the inflection point of the image side surface of the seventh lens to the optical axis is represented.
3. An imaging lens group according to claim 1, further satisfying the following conditional expression: f/EPD is less than or equal to 1.80, wherein f represents the focal length of the shooting lens group, and EPD represents the entrance pupil diameter of the shooting lens group.
4. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0.5<CT4/CT6<2.5, wherein CT4Represents the thickness of the fourth lens on the optical axis, CT6Represents the thickness of the sixth lens on the optical axis.
5. An imaging lens group according to claim 1, further satisfying the following conditional expression: -10<f1/f<-1, wherein f1Denotes a focal length of the first lens, and f denotes a focal length of the image pickup lens group.
6. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0<f/R72<5, where f denotes a focal length of the image pickup lens group, R72Represents a radius of curvature of the image side surface of the seventh lens.
7. An imaging lens group according to claim 1, further satisfying the following conditional expression: -2<R32/R31<1, wherein R32Represents a radius of curvature, R, of the image-side surface of the third lens31Representing a radius of curvature of an object-side surface of the third lens.
8. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0.1<T23/(CT2+CT3) Less than or equal to 0.5, wherein T is23Represents the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, CT2Representing the thickness of said second lens on the optical axis, CT3Represents the thickness of the third lens on the optical axis.
9. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided to an imaging surface of an image pickup lens group according to any one of claims 1 to 8, and the image pickup lens group.
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| TWI687713B (en) * | 2019-04-24 | 2020-03-11 | 大立光電股份有限公司 | Optical lens assembly, image capturing unit and electronic device |
| CN112578532B (en) * | 2019-09-30 | 2022-04-22 | 华为技术有限公司 | Optical lens, camera module and terminal |
| CN110579864B (en) * | 2019-10-29 | 2024-05-14 | 浙江舜宇光学有限公司 | Optical imaging lens |
| TWI712830B (en) | 2019-12-25 | 2020-12-11 | 大立光電股份有限公司 | Photographing optical lens assembly, image capturing unit and electronic device |
| CN114556181A (en) * | 2019-12-25 | 2022-05-27 | Oppo广东移动通信有限公司 | Imaging lens, camera module, and imaging apparatus |
| CN113885179B (en) * | 2020-01-15 | 2024-03-29 | 浙江舜宇光学有限公司 | Image pickup lens group |
| CN111239983B (en) * | 2020-03-24 | 2022-06-14 | 南京理工大学 | Wide-angle photographic lens with high imaging quality |
| CN113419330B (en) * | 2021-06-07 | 2022-05-13 | 江西晶超光学有限公司 | Optical system, camera module, electronic equipment and carrier |
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