CN110058381B - Optical lens and electronic device - Google Patents
Optical lens and electronic device Download PDFInfo
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- CN110058381B CN110058381B CN201811604881.2A CN201811604881A CN110058381B CN 110058381 B CN110058381 B CN 110058381B CN 201811604881 A CN201811604881 A CN 201811604881A CN 110058381 B CN110058381 B CN 110058381B
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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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Abstract
The invention discloses an optical lens, which sequentially comprises 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 from an object side to an image side, wherein the first lens element and the third lens element both have positive refractive power, the seventh lens element has negative refractive power, an object-side surface of the first lens element is convex at a paraxial region, an object-side surface of the third lens element is convex at the paraxial region, an object-side surface of the fourth lens element is convex at the paraxial region, and an image-side surface of the fourth lens element is concave at the paraxial region. The optical lens has excellent optical characteristics, obtains good imaging quality, optimizes the surface shape of the image side surface of the second lens, and can effectively correct coma aberration, distortion and chromatic aberration of the imaging lens, thereby having the characteristics of large aperture, high pixel, high resolution and the like, having excellent optical characteristics and providing good imaging quality. The invention also discloses an electronic device.
Description
Technical Field
The invention relates to the technical field of optical devices, in particular to an optical lens. 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 the electronic products. With the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced, and accordingly, the imaging lens has been gradually developed in the high pixel field, so that the imaging quality requirement of the optical imaging lens is increasingly increased.
The conventional optical lens mounted on a portable electronic product mostly adopts a three-piece or four-piece lens structure, and the existing optical imaging lens cannot meet a higher-order photographing 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 imaging lenses for better imaging quality. On the other hand, the large aperture characteristic is one of the currently indispensable elements for providing sufficient illuminance to the imaging surface of the imaging lens. Therefore, an imaging lens with a large aperture and excellent optical characteristics is needed.
Disclosure of Invention
The invention aims to provide an optical lens which has the characteristics of large aperture, high pixel, high resolution 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:
an optical 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 space and an image-side surface facing an image space, the object-side surface and the image-side surface of each lens element being aspheric, wherein:
the first lens element and the third lens element with positive refractive power, the seventh lens element with negative refractive power, the first lens element having a convex object-side surface at paraxial region, the third lens element having a convex object-side surface at paraxial region, the fourth lens element having a convex object-side surface at paraxial region, and the fourth lens element having a concave image-side surface at paraxial region;
and satisfies the following conditional expressions:
0.2<Yc22/SD22<1.0；
wherein Yc22Representing the perpendicular distance, SD, of an inflection point on the image-side surface of the second lens to the optical axis22Representing an effective radius of an image side surface of the second lens.
Preferably, the sixth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region.
Preferably, the following conditional formula is also satisfied: yc is not less than 0.532/Yc42Less than or equal to 1.5, wherein Yc32Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the third lens from the optical axis42Representing the perpendicular distance of an inflection point on the image-side surface of the fourth lens from the optical axis.
Preferably, the following conditional formula is also satisfied: 0<f/R72<5, where f denotes a focal length of the optical lens, R72Represents a radius of curvature of the image side surface of the seventh lens.
Preferably, the following conditional expression is also satisfied：-2<(R61+R62)/(R61-R62)<2, wherein R61Represents 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: BL/TL is more than or equal to 0.13 and less than or equal to 0.3, wherein BL represents the distance between the image side surface of the seventh lens element and the imaging surface on the optical axis, and TL represents the distance between the object side surface of the first lens element and the imaging surface on the optical axis.
Preferably, the following conditional formula is also satisfied: f/f is more than or equal to 0.33Less than or equal to 0.6, wherein f represents the focal length of the optical lens, f3Represents the focal length of the third lens.
Preferably, the following conditional formula is also satisfied: 0.5<CT6/ET6<1.5, wherein CT6Denotes the thickness of the sixth lens element on the optical axis, ET6Representing the edge thickness of the sixth lens.
Preferably, the following conditional formula is also satisfied: 1.5<(CT6+CT7)/T67<3.5, wherein CT6Represents the thickness of the sixth lens on the optical axis, CT7Represents the thickness of the seventh lens on the optical axis, T67And the distance from the image side surface of the sixth lens to the object side surface of the seventh lens on the optical axis is represented.
An electronic device comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and the optical lens, and the electronic photosensitive element is arranged on an imaging surface of the optical lens.
In view of the above technical solutions, the optical lens 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, where an object side light passes through the respective lens elements in sequence to form an image on an image plane located at the image side of the seventh lens element. The optical lens has a seven-piece lens structure, each lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens, and the optical lens has excellent optical characteristics and obtains good imaging quality. The second lens is provided with a first lens surface and a second lens surface, wherein the first lens surface is provided with a first lens surface and a second lens surface, and the second lens surface is provided with a second lens surface. The optical lens provided by the invention has the characteristics of large aperture, high pixel, high resolution and the like, has excellent optical characteristics, provides 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 optical lens system according to embodiment 1 of the present invention;
fig. 2 is a distortion field plot of the optical lens in embodiment 1 of the present invention;
fig. 3 is a spherical aberration curve chart of the optical lens in embodiment 1 of the present invention;
fig. 4 is a schematic view of an optical lens system according to embodiment 2 of the present invention;
fig. 5 is a distortion field plot of the optical lens in embodiment 2 of the present invention;
fig. 6 is a spherical aberration curve chart of the optical lens in embodiment 2 of the present invention;
fig. 7 is a schematic view of an optical lens system according to embodiment 3 of the present invention;
fig. 8 is a distortion field plot of the optical lens in embodiment 3 of the present invention;
fig. 9 is a spherical aberration curve chart of the optical lens in embodiment 3 of the present invention;
fig. 10 is a schematic view of an optical lens system according to embodiment 4 of the present invention;
fig. 11 is a distortion field plot of the optical lens in embodiment 4 of the present invention;
FIG. 12 is a spherical aberration curve chart of the optical lens in embodiment 4 of the present invention;
fig. 13 is a schematic view of an optical lens system according to embodiment 5 of the present invention;
fig. 14 is a distortion field plot of the optical lens in embodiment 5 of the present invention;
FIG. 15 is a spherical aberration curve chart of the optical lens system in embodiment 5 of the present invention;
FIG. 16 shows Yc of an optical lens system according to embodiment 1 of the present invention22And SD22A schematic diagram of (a);
FIG. 17 shows Yc in the optical lens system according to embodiment 1 of the invention32A schematic diagram of (a);
FIG. 18 shows Yc in the optical lens system according to embodiment 1 of the invention42Schematic 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 an optical lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side, wherein each lens is provided with an object side surface facing an object space and an image side surface facing an image space, the optical lens 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 imaging lens. .
Specifically, the first lens element with positive refractive power has a convex object-side surface at a paraxial region, so that the configuration of the positive refractive power of the first lens element can be adjusted, which is beneficial to shortening the total track length of the optical lens assembly. The image-side surface of the first lens element may be concave at the paraxial region to adjust low-order aberrations.
The second lens element with negative refractive power can correct the aberration generated by the first lens element, and has a concave image-side surface at a paraxial region thereof, thereby improving the imaging quality.
The third lens element with positive refractive power can effectively distribute the refractive power of the first lens element, thereby reducing the sensitivity of the imaging lens, and can adjust the refractive power distribution of the optical lens to avoid excessive increase of astigmatism and distortion around the image. The third lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, which helps to correct astigmatism of the optical lens element and improve image quality.
The fourth lens element with refractive power can be adjusted in cooperation with the refractive power of the third lens element, so that the refractive power distribution of the photographing system is relatively uniform. The object-side surface of the fourth lens element is convex at the paraxial region and changes from convex to concave from the paraxial region to the peripheral region, and the image-side surface of the fourth lens element is concave at the paraxial region and changes from concave to convex from the paraxial region to the peripheral region, thereby enhancing the correction of astigmatism.
The fifth lens element with refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region, thereby avoiding excessive concentration of refractive power on the fifth lens element, and reducing excessive curvature of the periphery of the lens element to reduce molding defects.
The seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface, which helps to make the principal point of the optical lens effectively away from the image plane, so as to shorten the back focal length thereof, thereby reducing the total track length of the optical lens and achieving 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.
By reasonably controlling the positive and negative distribution of the focal power of each lens in the optical lens, the low-order aberration of a control system can be effectively balanced, the tolerance sensitivity of the system can be reduced, and the miniaturization of the optical lens is favorably ensured. The optical imaging lens has no relative movement between the lenses, and each two adjacent lenses can have an air space on the optical axis, which is beneficial to the assembly of the lenses and improves the manufacturing yield.
Each lens of the optical lens is made of a material with high light transmittance and excellent processability, and the condition 1.60 is met<Nmax<1.70 of which NmaxThe maximum value of the refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is shown, so that the manufacturing and forming of the lenses are facilitated, the manufacturing yield is improved, the material cost meeting the condition is low, the material cost is easy to obtain, and the production cost is reduced. In addition, the second lens satisfies 0.2<Yc22/SD22<1.0，Yc22Representing the vertical distance, SD, from the optical axis to the point of inflection closest to the optical axis on the image-side surface of the second lens22Representing an effective radius of an image side surface of the second lens. By optimizing the surface type of the image side surface of the second lens, the coma aberration, distortion and chromatic aberration of the imaging lens can be effectively corrected, so that the imaging quality is effectively improved. Therefore, the optical lens of the invention can have the characteristics of large aperture, high pixel, high resolution and the like, can have excellent optical characteristics, provides good imaging quality and meets the application requirements.
Preferably, the sixth lens element with positive refractive power has a convex object-side surface at a paraxial region and a change from convex to concave at a peripheral region, and has a convex image-side surface at a paraxial region, which is advantageous for correcting high-order aberrations of the imaging lens and improving resolution to obtain good imaging quality.
Preferably, the optical lens further satisfies the following conditional expression: yc is not less than 0.532/Yc42Less than or equal to 1.5, wherein Yc32Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the third lens from the optical axis42Representing the perpendicular distance of an inflection point on the image-side surface of the fourth lens from the optical axis. Satisfying the condition can effectively increase the light height, satisfy the requirement of high pixel of the optical lens, and make the light deflection tend to be relaxed, and can effectively reduce the sensitivity of the imaging lens, and at the same time can effectively reduce the sensitivity of the imaging lensAnd correcting coma aberration, distortion and chromatic aberration of the optical lens. Preferably, the following conditions are satisfied: yc is not less than 0.532/Yc42≤1.0。
Preferably, the optical lens further satisfies the following conditional expression: 0<f/R72<5, where f denotes a focal length of the optical lens, R72Represents a radius of curvature of the image side surface of the seventh lens. By controlling the ratio of the focal length of the imaging lens to the curvature radius of the image side surface of the seventh lens, the principal point of the imaging lens is facilitated to be far away from the imaging surface, so that the back focal length of the imaging lens is shortened, and the miniaturization of the lens is facilitated to be maintained. Preferably, the following conditions are satisfied: 1.0<f/R72<2.0。
Preferably, the optical lens further satisfies the following conditional expression: -2<(R61+R62)/(R61-R62)<2, wherein R61Represents 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. By reasonably configuring the curvature radii of the object side surface and the image side surface of the sixth lens element, the surface shape of the sixth lens element can be adjusted to correct off-axis aberration, and the sixth lens element can have appropriate incident and emergent angles of light rays, which is beneficial to increase the area of an imaging surface. Preferably, the following conditions are satisfied: -1<(R61+R62)/(R61-R62)<1。
Preferably, the optical lens further satisfies the following conditional expression: BL/TL is more than or equal to 0.13 and less than or equal to 0.3, wherein BL represents the distance between the image side surface of the seventh lens element and the imaging surface on the optical axis, and TL represents the distance between the object side surface of the first lens element and the imaging surface on the optical axis. The optical imaging lens meeting the condition can ensure back focus on the basis of miniaturization, and is favorable for improving the manufacturability of the optical lens.
Preferably, the optical lens further satisfies the following conditional expression: f/f is more than or equal to 0.33Less than or equal to 0.6, wherein f represents the focal length of the optical lens, f3Represents the focal length of the third lens. By properly arranging the focal length of the third lens, the positive focal power of the third lens can be made not weak enough with respect to the focal power of the entire system, and the first lens and the third lens can be appropriately shared with each other to form an imaging lensThe head has a main imaging function, and therefore, spherical aberration can be corrected satisfactorily while maintaining a small aperture value. Further, the positive refractive power of the third lens can be set to be not excessively strong with respect to the refractive power of the entire imaging lens, and the total lens length can be appropriately shortened while a wide field angle is achieved.
Preferably, the optical lens further satisfies the following conditional expression: 0.5<CT6/ET6<1.5, wherein CT6Denotes the thickness of the sixth lens element on the optical axis, ET6Representing the edge thickness of the sixth lens. By reasonably adjusting the structural size of the sixth lens, the distortion of the optical lens can be balanced while the size of the optical lens is reduced and good processability is kept.
Preferably, the optical lens further satisfies the following conditional expression: 1.5<(CT6+CT7)/T67<3.5, wherein CT6Represents the thickness of the sixth lens on the optical axis, CT7Represents the thickness of the seventh lens on the optical axis, T67And the distance from the image side surface of the sixth lens to the object side surface of the seventh lens on the optical axis is represented. Satisfying this condition is favorable to slowing down light deflection, increases the image plane to be favorable to making optical lens have low sensitivity, high-quality formation of image effect.
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 optical lens system provided by the present invention, if the refractive power or the focal length of the lens element does not define the position of the region, it means that 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 optical lens, 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 passing through the surface 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. In the optical lens provided by the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, 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 optical lens disclosed by the invention, the material of the lens can be plastic, and when the material of the lens is plastic, the production cost can be effectively reduced. In addition, the object-side surface and the image-side surface of each lens can be Aspheric Surfaces (ASP), the ASP can be easily manufactured into shapes other than spherical surfaces, more control variables are obtained to reduce aberration, and the number of the lenses is further reduced, so that the total length of the optical lens can be effectively reduced.
In addition, in the optical imaging lens, 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 front aperture, i.e., the aperture is disposed between the subject and the first lens. The front setting of the aperture can make the exit pupil of the optical lens and the imaging surface generate longer distance, so that the optical lens has telecentric effect and can increase the efficiency of CCD or CMOS of the electronic photosensitive element for receiving images.
The optical lens of the present invention will be described in detail with reference to specific embodiments. 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 structural diagram of an optical lens of embodiment 1 is shown. As can be seen, the optical lens system of the present embodiment includes an aperture stop 100, a first lens element 110, a second lens element 120, 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, which are sequentially disposed along an optical axis from an object side to an image side. The first lens element 110 with positive refractive power has a convex object-side surface 111 at a paraxial region and a concave image-side surface 112 at a paraxial region, and is made of plastic material. The second lens element 120 with negative refractive power has a concave object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material. The third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region and a concave image-side surface 132 at a paraxial region, and is made of plastic material. The fourth lens element 140 with positive refractive power is made of plastic, and has a convex object-side surface 141 at a paraxial region and a concave-convex transition from the paraxial region to the peripheral region, and a concave image-side surface 142 at the paraxial region and a convex-concave transition from the paraxial region to the peripheral region. The fifth lens element 150 with positive refractive power has a convex object-side surface 151 at a paraxial region and a concave image-side surface 152 at a paraxial region, and is made of plastic material. 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, and is made of plastic. The seventh lens element 170 with negative refractive power is made of plastic, and has an object-side surface 171 being concave at a paraxial region and having a change from concave at a paraxial region to convex at a peripheral region, and an image-side surface 172 being concave at a paraxial region and having a change from concave at a paraxial region to convex at a peripheral region. In addition, the optical imaging lens further includes an infrared filter 180 disposed between the seventh lens 170 and the imaging surface 190, and the infrared filter 180 filters out the infrared band light entering the optical lens assembly, so as 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.
The values of the optical lens of this embodiment satisfying the conditional expressions are shown in table 6. In addition, referring to fig. 16, 17 and 18, the vertical distance from the inflection point 1221 on the image-side surface of the second lens element 120 to the optical axisYc22And the effective radius SD of the image side surface of the second lens 12022As shown with reference to fig. 16. The perpendicular distance Yc from the inflection point 1321 on the image-side surface of the third lens 130 to the optical axis32Referring to FIG. 17, the vertical distance Y from the inflection point 1421 on the image-side surface of the fourth lens 140 to the optical axis42As shown with reference to fig. 18.
In the detailed optical data of embodiment 1, as shown in table 1-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field of view, and surfaces 0-18 sequentially represent the surfaces from the object side to the image side. Surfaces 1-15 sequentially represent aperture stop 100, first lens object side surface 111, first lens image side surface 112, second lens object side surface 121, second lens image side surface 122, third lens object side surface 131, third lens image side surface 132, fourth lens object side surface 141, fourth lens image side surface 142, fifth lens object side surface 151, fifth lens image side surface 152, sixth lens object side surface 161, sixth lens image side surface 162, seventh lens object side surface 171, and seventh lens image side surface 172.
TABLE 1-1
Each lens in the optical lens adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
wherein, X represents a point on the aspheric surface with a distance of Y from the optical axis and a relative distance with a tangent plane tangent to a vertex on the aspheric surface optical axis, R represents a curvature radius, Y represents a perpendicular distance between the point on the aspheric surface curve and the optical axis, k represents a conic coefficient, and Ai represents an i-th order aspheric coefficient.
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 and spherical aberration graphs of the optical lens of the present embodiment are respectively shown in fig. 2 and fig. 3, wherein the wavelength in the distortion field curves is 0.555 μm, and the wavelength in the spherical aberration graphs is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm. The data in the tables of the following embodiments correspond to the schematic structure diagram of the optical lens, the distorted field curvature and the spherical aberration curve chart of the respective embodiments, and the definitions of the data in the tables are the same as those in tables 1-1 and 1-2 of embodiment 1, and will not be described again.
Tables 1 to 2
[ example 2 ]
Referring to fig. 4, a schematic structural diagram of an optical lens of embodiment 2 is shown. As can be seen, the optical lens system of the present embodiment includes an aperture stop 200, a first lens element 210, a second lens element 220, 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 arranged in order from an object side to an image side along an optical axis, each of the lens elements 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 of the lens elements are aspheric. The first lens element 210 with positive refractive power has a convex object-side surface 211 at a paraxial region and a concave image-side surface 212 at a paraxial region, and is made of plastic material. The second lens element 220 with negative refractive power has a concave object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material. The third lens element 230 with positive refractive power has a convex object-side surface 231 and a concave image-side surface 232. The fourth lens element 240 with positive refractive power is made of plastic, and has an object-side surface 241 being convex at a paraxial region and having a convex-to-concave variation from the paraxial region to the peripheral region, and an image-side surface 242 being concave at the paraxial region and having a concave-to-convex variation from the paraxial region to the peripheral region. The fifth lens element 250 with positive refractive power has a convex object-side surface 251 and a concave 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. The seventh lens element 270 with negative refractive power is made of plastic, and has a concave object-side surface 271 with a concave surface at a paraxial region and a concave-to-convex surface variation from the paraxial region to the peripheral region, and a concave image-side surface 272 with a concave surface at a paraxial region and a concave-to-convex surface variation from the paraxial region to the peripheral region. In addition, the optical imaging lens further includes an infrared filter 280 disposed between the seventh lens 270 and the imaging surface 290, and the infrared filter 280 filters the infrared band light entering the optical 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 2-1, Table 2-2 and Table 6. 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 structural diagram of an optical lens of embodiment 3 is shown. As can be seen, the optical lens system of the present embodiment includes an aperture stop 300, a first lens element 310, a second lens element 320, 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, which are sequentially disposed along an optical axis from an object side to an image side. The first lens element 310 with positive refractive power has a convex object-side surface 311 at a paraxial region and a concave image-side surface 312 at a paraxial region, and is made of plastic material. The second lens element 320 with negative refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region, and is made of plastic material. The third lens element 330 with positive refractive power has a convex object-side surface 331 at a paraxial region and a concave image-side surface 332 at a paraxial region, and is made of plastic material. The fourth lens element 340 with negative refractive power is made of plastic, and has an object-side surface 341 being convex at paraxial region and having a change from convex to concave at paraxial region, and an image-side surface 342 being concave at paraxial region and having a change from concave to convex at paraxial region. The fifth lens element 350 with positive refractive power has a convex object-side surface 351 at a paraxial region and a concave image-side surface 352 at the paraxial region, and is made of plastic material. 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, and is made of plastic. The seventh lens element 370 with negative refractive power is made of plastic, and has a concave object-side surface 371 changing from concave at a paraxial region to convex at a peripheral region, and a concave image-side surface 372 changing from concave at a paraxial region to convex at a peripheral region. In addition, the optical imaging lens further includes an infrared filter 380 disposed between the seventh lens 370 and the imaging surface 390, and the infrared filter 380 filters the infrared band light entering the optical 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 6. 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 structural diagram of an optical lens of embodiment 4 is shown. As can be seen, the optical lens system of the present embodiment includes an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, and a seventh lens element 470, which are sequentially disposed from an object side to an image side along an optical axis, each of the lens elements 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 of the lens elements are aspheric. The first lens element 410 with positive refractive power has a convex object-side surface 411 and a concave image-side surface 412. The second lens element 420 with negative refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region, and is made of plastic material. The third lens element 430 with positive refractive power has a convex object-side surface 431 at a paraxial region and a concave image-side surface 432 at a paraxial region, and is made of plastic material. The fourth lens element 440 with positive refractive power is made of plastic, and has an object-side surface 441 that is convex at a paraxial region and changes from convex at a paraxial region to concave at a peripheral region, and an image-side surface 442 that is concave at a paraxial region and changes from concave at a paraxial region to convex at a peripheral region. The fifth lens element 450 with positive refractive power has a convex object-side surface 451 at a paraxial region and a concave image-side surface 452 at a paraxial region, and is made of plastic material. The sixth lens element 460 with positive refractive power has a convex object-side surface 461 and a convex image-side surface 462. The seventh lens element 470 with negative refractive power is made of plastic, and has a concave object-side surface 471 at a paraxial region and a concave-to-convex change from the paraxial region to the peripheral region, and a concave image-side surface 472 at the paraxial region and a concave-to-convex change from the paraxial region to the peripheral region. In addition, the optical imaging lens further includes an infrared filter 480 disposed between the seventh lens 470 and the imaging surface 490, and the infrared band light entering the optical lens assembly is filtered by the infrared filter 480, so as 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 6. 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 structural diagram of an optical lens of embodiment 5 is shown. As can be seen, the optical lens system of this embodiment includes, in order from an object side to an image side along an optical axis, an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560 and a seventh lens element 570, wherein each lens element 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 element are aspheric. The first lens element 510 with positive refractive power has a convex object-side surface 511 and a concave image-side surface 512. The second lens element 520 with negative refractive power has a concave object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region, and is made of plastic. The third lens element 530 with positive 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 is made of plastic, and has an object-side surface 541 being convex at a paraxial region and changing from convex to concave from the paraxial region to the peripheral region, and an image-side surface 542 being concave at the paraxial region and changing from concave to convex from the paraxial region to the peripheral region. The fifth lens element 550 with positive refractive power has a convex object-side surface 551 at paraxial region and a concave image-side surface 552 at paraxial region, and is made of plastic material. 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, and is made of plastic material. The seventh lens element 570 with negative refractive power is made of plastic, and has a concave object-side surface 571 at a paraxial region and a concave-to-convex change from the paraxial region to the peripheral region, and a concave image-side surface 572 at the paraxial region and a concave-to-convex change from the paraxial region to the peripheral region. In addition, the optical imaging lens further includes an infrared filter 580 disposed between the seventh lens element 570 and the imaging surface 590, and the infrared filter 580 filters out the infrared band light entering the optical lens assembly, so as 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 5-1, Table 5-2 and Table 6. The corresponding distortion plots and spherical aberration plots are shown in fig. 14 and 15, respectively.
TABLE 5-1
TABLE 5-2
In summary, examples 1 to 5 satisfy the relationships shown in table 6, respectively.
TABLE 6
| Conditional formula (II) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Yc22/SD22 | 0.46 | 0.54 | 0.96 | 0.73 | 0.66 |
| Yc32/Yc42 | 0.64 | 0.59 | 0.79 | 0.79 | 0.65 |
| f/R72 | 1.36 | 1.29 | 1.50 | 1.69 | 1.41 |
| (R61+R62)/(R61-R62) | -0.59 | -0.99 | 0.30 | -0.43 | -0.60 |
| BL/TL | 0.17 | 0.15 | 0.15 | 0.22 | 0.15 |
| f/f3 | 0.47 | 0.50 | 0.53 | 0.57 | 0.30 |
| CT6/ET6 | 0.75 | 0.60 | 1.37 | 0.91 | 0.63 |
| (CT6+CT7)/T67 | 1.99 | 1.77 | 2.96 | 3.41 | 2.15 |
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 optical lens, and the electronic photosensitive element is arranged on an imaging surface of the optical lens.
In the electronic apparatus provided by the embodiment, the optical lens adopted by the image capturing device is of a seven-piece lens structure, and each lens adopts a reasonable surface shape structure and an optimized range combination of optical parameters of each lens, so that the electronic apparatus has excellent optical characteristics and obtains good imaging quality. The second lens is provided with a first lens surface and a second lens surface, wherein the first lens surface is provided with a first lens surface and a second lens surface, and the second lens surface is provided with a second lens surface. The optical lens of the electronic device of the embodiment has the characteristics of large aperture, high pixel, high resolution and the like, can have excellent optical characteristics, provides good imaging quality, and meets application requirements.
The optical lens and the electronic device provided by the invention are described in detail above. 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 (8)
1. An optical lens assembly includes 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, each lens element having an object-side surface and an image-side surface, each of the object-side and image-side surfaces being aspheric, wherein:
the first lens element and the third lens element both have positive refractive power, the seventh lens element has negative refractive power, the object-side surface of the first lens element is convex at a paraxial region, the object-side surface of the third lens element is convex at a paraxial region, the object-side surface of the fourth lens element is convex at a paraxial region, the image-side surface of the fourth lens element is concave at a paraxial region, the image-side surface of the first lens element is concave at a paraxial region, the second lens element has negative refractive power, the image-side surface of the second lens element is concave at a paraxial region, the image-side surface of the third lens element is concave at a paraxial region, the fifth lens element has positive refractive power, the object-side surface of the fifth lens element is convex at a paraxial region, the image-side surface of the sixth lens element is concave at a paraxial region, the object-side surface of the sixth lens element is convex at a paraxial region, the image-side surface of the seventh lens element is concave at a paraxial region, the image side surface is concave at the position of the paraxial region;
and satisfies the following conditional expressions: 0.2<Yc22/SD22<1.0，0.3≤f/f3≤0.6；
Wherein Yc22Representing the perpendicular distance, SD, of an inflection point on the image-side surface of the second lens to the optical axis22Representing the effective radius of the image side surface of the second lens, f representing the focal length of the optical lens, f3Represents the focal length of the third lens.
2. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: yc is not less than 0.532/Yc42Less than or equal to 1.5, wherein Yc32Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the third lens from the optical axis42Representing the perpendicular distance of an inflection point on the image-side surface of the fourth lens from the optical axis.
3. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: 0<f/R72<5, where f denotes a focal length of the optical lens, R72Represents a radius of curvature of the image side surface of the seventh lens.
4. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: -2<(R61+R62)/(R61-R62)<2, wherein R61Represents 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.
5. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: BL/TL is more than or equal to 0.13 and less than or equal to 0.3, wherein BL represents the distance between the image side surface of the seventh lens element and the imaging surface on the optical axis, and TL represents the distance between the object side surface of the first lens element and the imaging surface on the optical axis.
6. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: 0.5<CT6/ET6<1.5, wherein CT6Denotes the thickness of the sixth lens element on the optical axis, ET6Representing the edge thickness of the sixth lens.
7. An optical lens according to claim 1, characterized in that the following conditional expression is also satisfied: 1.5<(CT6+CT7)/T67<3.5, wherein CT6Represents the thickness of the sixth lens on the optical axis, CT7Represents the thickness of the seventh lens on the optical axis, T67And the distance from the image side surface of the sixth lens to the object side surface of the seventh lens on the optical axis is represented.
8. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided to an imaging surface of an optical lens according to any one of claims 1 to 7 and the optical lens.
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| JP2003121736A (en) * | 2001-10-15 | 2003-04-23 | Nitto Kogaku Kk | Projection lens |
| US20160241756A1 (en) * | 2015-02-17 | 2016-08-18 | Largan Precision Co., Ltd. | Photographing system, image capturing unit and electronic device |
| CN206946079U (en) * | 2017-06-08 | 2018-01-30 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN108363180A (en) * | 2018-04-26 | 2018-08-03 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN108873252A (en) * | 2018-07-02 | 2018-11-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| JP2003121736A (en) * | 2001-10-15 | 2003-04-23 | Nitto Kogaku Kk | Projection lens |
| US20160241756A1 (en) * | 2015-02-17 | 2016-08-18 | Largan Precision Co., Ltd. | Photographing system, image capturing unit and electronic device |
| CN206946079U (en) * | 2017-06-08 | 2018-01-30 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN108363180A (en) * | 2018-04-26 | 2018-08-03 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN108873252A (en) * | 2018-07-02 | 2018-11-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
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