CN109143551B - Optical imaging lens group and camera device using same - Google Patents
Optical imaging lens group and camera device using same Download PDFInfo
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- CN109143551B CN109143551B CN201811108129.9A CN201811108129A CN109143551B CN 109143551 B CN109143551 B CN 109143551B CN 201811108129 A CN201811108129 A CN 201811108129A CN 109143551 B CN109143551 B CN 109143551B
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- 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 imaging lens group and a camera device using the same, wherein the optical imaging lens group comprises the following components in sequence from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the optical imaging lens assembly has a focal length f, a distance TL from the object-side surface of the first lens element to an image plane on the optical axis, an effective radius SD12 of the image-side surface of the first lens element, and an effective radius SD22 of the image-side surface of the second lens element, and the optical imaging lens assembly satisfies the following conditions: SD12-SD22 of more than or equal to 0.1 and less than or equal to 0.3; and TL/f is more than or equal to 0.9 and less than or equal to 1. Above-mentioned optical imaging lens group, through the shape of face structure with each lens with optical parameter cooperatees, guaranteed high-order formation of image quality, can maintain high formation of image quality under the prerequisite of shortening system length effectively, make optical imaging lens group possess the long focal characteristic and satisfy the telephoto demand, make the camera device who has used this optical imaging lens group frivolous portable simultaneously.
Description
Technical Field
The invention relates to the technical field of optical lens group equipment, in particular to an optical imaging lens group and a camera device using the same.
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. The refinement of semiconductor manufacturing process technology has realized the pixel size reduction of photosensitive devices, and optical imaging systems gradually develop to the high pixel field, and also put forward higher requirements on imaging quality. This requires not only the optical imaging lens to have performance such as miniaturization, large aperture, high resolution, etc., but also the optical imaging lens to have characteristics such as telephoto, etc. In addition, for some electronic devices, such as smart phones, the ultra-narrow-frame and frameless full-screen design is adopted, and the size of an optical lens head used by the camera module is required to be smaller.
The traditional optical system for long-range shooting mostly adopts a multi-piece structure and carries a spherical glass lens, and the configuration causes the overlarge volume of the lens and is not easy to carry, so that the lens is not suitable for increasingly light, thin and portable consumer electronic products, and the cost is higher. Therefore, how to effectively compress the total length of the optical imaging lens and simultaneously achieve the long-focus characteristic and good imaging quality, meeting the development requirements of ultra-thin and miniaturization of the current electronic devices is a problem to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an optical imaging lens group and a camera device applying the optical imaging lens group, which can effectively compress the total length of an optical imaging lens, simultaneously give consideration to the long-focus characteristic and good imaging quality, achieve the purposes of lightness and thinness, miniaturize the head of the lens and meet the development requirements of ultrathin and miniaturization of the existing electronic equipment.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising:
the first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a third lens element with positive refractive power;
a fourth lens element with positive refractive power;
the fifth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface; and
a sixth lens element with negative refractive power having a concave object-side surface and a convex image-side surface at a paraxial region;
the surfaces of the object side and the image side of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric;
the optical imaging lens assembly has a focal length f, an axial distance TL from the object-side surface of the first lens element to the image plane, an effective radius SD12 of the image-side surface of the first lens element, and an effective radius SD22 of the image-side surface of the second lens element, wherein the optical imaging lens assembly satisfies the following conditions:
SD12-SD22 of more than or equal to 0.1 and less than or equal to 0.3; and
0.9≤TL/f≤1。
optionally, an object-side surface of the third lens element is convex at a paraxial region thereof, and an image-side surface of the third lens element is concave at a paraxial region thereof, and the image-side surface of the third lens element has at least one inflection point.
Optionally, a vertical distance between a boundary of the image-side surface of the third lens element and the optical axis is Yc32, a vertical distance between a boundary of the image-side surface of the fifth lens element and the optical axis is Yc52, and the optical imaging lens assembly satisfies the following relationship:
1≤Yc32/Yc52≤1.5。
optionally, an air gap between the fourth lens element and the fifth lens element on the optical axis is T45, a thickness of the fourth lens element on the optical axis is CT4, a thickness of the fifth lens element on the optical axis is CT5, and the optical imaging lens assembly satisfies the following relation:
0.4≤T45/(CT4+CT5)≤1.0。
optionally, an air gap on the optical axis between the third lens element and the fourth lens element is T34, a sum of air gaps on the optical axis between adjacent ones of the first lens element and the sixth lens element is AAT, and the optical imaging lens assembly satisfies the following relation:
0.1≤T34/AAT≤0.3。
optionally, an effective radius of the image-side surface of the sixth lens element is SD62, an entrance pupil diameter is EPD, and the optical imaging lens assembly satisfies the following relation:
0.5≤SD62/EPD≤0.7。
optionally, the focal length of the optical imaging lens group is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the optical imaging lens group satisfies the following relation:
2.5≤|f/f1|+|f/f2|≤3.5。
optionally, the focal length of the optical imaging lens group is f, the radius of curvature of the image-side surface of the sixth lens element is R12, and the optical imaging lens group satisfies the following relation:
-0.5≤f/R12≤0。
optionally, the thickness of the first lens element on the optical axis is CT1, the thickness of the second lens element on the optical axis is CT2, and the optical imaging lens assembly satisfies the following relation:
2≤CT1/CT2≤4。
the invention also provides a camera device, such as the optical imaging lens group.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an optical imaging lens group and a camera device using the same, which are applied to various electronic devices. In the optical imaging lens group, the surface shape structure of each lens is matched with the optical parameters, so that high-order imaging quality is ensured, high imaging quality can be maintained on the premise of effectively shortening the system length, the optical imaging lens group has long-focus characteristics and meets the telephoto requirement, and meanwhile, the camera device using the optical imaging lens group is light and thin in size and convenient to carry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 2 is a graph illustrating astigmatism and distortion curves of an optical imaging lens assembly according to an embodiment of the invention;
FIG. 3 is a spherical aberration curve chart of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 4 is a schematic view of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 5 is a graph illustrating astigmatism and distortion curves, in order from left to right, of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 6 is a spherical aberration curve chart of the optical imaging lens assembly according to the second embodiment of the present invention;
FIG. 7 is a schematic view of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 8 is a graph showing astigmatism and distortion curves, in order from left to right, of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 9 is a spherical aberration curve chart of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 10 is a schematic view of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 11 is a graph showing astigmatism and distortion curves, in order from left to right, of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 12 is a spherical aberration curve chart of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 13 is a schematic view of an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 14 is a graph showing astigmatism and distortion curves, in order from left to right, of an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 15 is a spherical aberration curve chart of an optical imaging lens assembly according to the fifth embodiment of the present invention;
FIG. 16 is a schematic view of an optical imaging lens assembly according to a sixth embodiment of the present invention;
FIG. 17 is a graph showing astigmatism and distortion curves, in order from left to right, of an optical imaging lens assembly according to a sixth embodiment of the present invention;
FIG. 18 is a spherical aberration curve chart of an optical imaging lens assembly according to the sixth embodiment of the present invention;
FIG. 19 is a schematic view of a vertical distance Yc32 between an inflection point on an image-side surface of a third lens element of the optical imaging lens assembly closest to the optical axis and the optical axis according to an embodiment of the present invention;
FIG. 20 is a schematic diagram illustrating a vertical distance Yc52 between an inflection point on an image-side surface of a fifth lens element of the optical imaging lens assembly closest to the optical axis and the optical axis.
In the above figures:
first lens: 110, 210, 310, 410, 510, 610; object side surface 111, 211, 311, 411, 511, 611; image-side surface: 112, 212, 312, 412, 512, 612;
second lens: 120, 220, 320, 420, 520, 620; object side surfaces 121, 221, 321, 421, 521, 621; image-side surface: 122, 222, 322, 422, 522, 622;
130, 230, 330, 430, 530, 630 of the third lens; object side surfaces 131, 231, 331, 431, 531, 631; image-side surface: 132, 232, 332, 432, 532, 632;
fifth lens element: 150, 250, 350, 450, 550, 650; object side surfaces 151, 251, 351, 451, 551, 651; image-side surface: 152, 252, 352, 452, 552, 652;
sixth lens element: 160, 260, 360, 460, 560, 660; object side surfaces 161, 261, 361, 461, 561, 661; image-side surface: 162, 262, 362, 462, 562, 662;
an infrared filter: 170. 270, 370, 470, 570, 670; imaging surface: 180. 280, 380, 480, 580, 680;
aperture: 101. 102, 103, 104, 105, 106; third lens inflection point: 1301; fifth lens inflection point: 1501;
SD 12: an effective radius of an image-side surface of the first lens; SD 22: an effective radius of an image-side surface of the second lens; TL: the distance from the object side surface of the first lens to the imaging surface on the optical axis; f: the focal length of the optical imaging lens group; yc 32: the vertical distance between the critical point of the image side surface of the third lens and the optical axis; yc 52: the vertical distance between the critical point of the image side surface of the fifth lens and the optical axis; t45: an air gap on the optical axis between the fourth lens and the fifth lens; CT 4: the thickness of the fourth lens on the optical axis; CT 5: the thickness of the fifth lens on the optical axis; t34: an air gap on the optical axis between the third lens and the fourth lens; AAT: represents a sum of air intervals on an optical axis between respective adjacent lenses of the first lens to the sixth lens; SD 62: the effective radius of the image-side surface of the sixth lens; EPD: an entrance pupil diameter; f 1: a focal length of the first lens; f 2: a focal length of the second lens; r12: the curvature radius of the image side surface of the sixth lens; CT 1: the thickness of the first lens on the optical axis; CT 2: the thickness of the second lens on the optical axis.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
the invention provides an optical imaging lens group, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, an imaging surface positioned on the image side, and an infrared filter arranged between the sixth lens and the imaging surface, wherein the infrared filter does not influence the focal length of the optical imaging lens group.
In the optical imaging lens assembly, at least one diaphragm can be arranged according to requirements to reduce stray light and be beneficial to improving image quality. In the present invention, the diaphragm is configured as a front diaphragm, that is, a diaphragm is disposed between the subject and the first lens. The front arrangement of the diaphragm can enable the Exit Pupil (Exit Pupil) of the optical imaging lens group to generate a longer distance with the imaging surface, so that the Exit Pupil has a Telecentric (telecentricity) effect, and the efficiency of receiving images by a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased.
The optical imaging lens assembly comprises six lens elements with refractive power. An air space can be formed between each two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on an optical axis, so that the assembly of the lenses is facilitated, and the manufacturing yield is improved.
The first lens element with positive refractive power has a convex object-side surface at paraxial region, and can adjust positive refractive power configuration to further shorten total optical length; the image side surface of the first lens element is concave at a paraxial region, thereby effectively adjusting low-order aberration.
The second lens element with negative refractive power is favorable for correcting the aberration generated by the first lens element. The second lens element has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, which facilitates adjustment of optical paths in different wavelength bands to focus image points and effectively correct aberrations of the imaging optical lens assembly.
The third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and has at least one inflection point.
The fourth lens element with positive refractive power can effectively disperse refractive power configuration to avoid generating excessive aberration, thereby improving imaging quality.
The fifth lens element with negative refractive power can balance chromatic aberration of the image lens assembly and is helpful for correcting aberration; the image side surface of the fifth lens element is concave at a paraxial region and has at least one inflection point, thereby effectively correcting chromatic aberration and spherical aberration near the optical axis and further correcting off-axis chromatic aberration of magnification and coma.
The sixth lens element with negative refractive power can balance the positive refractive power of the optical image system and effectively correct chromatic aberration of the optical image system.
The object-side surface of the sixth lens element is concave at a paraxial region thereof, and the refractive power thereof is enhanced by the surface shape of the object-side surface of the sixth lens element, thereby facilitating correction of chromatic aberration of the optical imaging lens assembly and avoiding imaging distortion. The image side surface of the sixth lens element is convex at a paraxial region, and the shape change of the image side surface of the sixth lens element is beneficial to suppressing an angle of incidence of an off-axis field on an imaging surface so as to maintain imaging illumination and correct off-axis aberration of the sixth lens element, thereby improving imaging quality.
The object side surfaces and the image side surfaces of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are aspheric.
In the optical imaging lens assembly disclosed 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 close to the optical axis of the lens surface; 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. If the refractive power or focal length of the lens element does not define the position of the lens region, it means that the refractive power or focal length of the lens element can be the refractive power or focal length of the lens element at the paraxial region.
It is to be understood that, in the above description, the object-side surface of the lens is convex, which means: making a tangent plane at any point on the object-side surface of the lens, wherein the surface is always on the right side of the tangent plane, and the curvature radius of the surface is positive; on the contrary, the object side surface is concave with a negative curvature radius. The image-side surface being convex means: making a tangent plane at any point on the surface of the image side of the lens, wherein the surface is always on the left side of the tangent plane, and the curvature radius of the surface is negative; on the contrary, the image side surface is a concave surface with a positive radius of curvature. If any point on the object-side surface or the image-side surface of the lens is taken as a tangent plane, and the surface has both the portion on the left side and the portion on the right side of the tangent plane, the surface has a curve inflection point, and the above method is still applicable to the determination of the unevenness of the object-side surface and the image-side surface at the paraxial region.
The aspherical surface curve equation of each lens is expressed as follows:
wherein X is the relative height of a point on the aspheric surface which is Y away from the optical axis and a tangent plane tangent to the vertex on the aspheric optical axis; r is a curvature radius; y is the vertical distance between a point on the aspheric curve and the optical axis; k is the cone coefficient; ai is an ith order aspheric coefficient.
The optical imaging lens assembly has a focal length f, an axial distance TL from the object-side surface of the first lens element to the image plane, an effective radius of the image-side surface of the first lens element is SD12, and an effective radius of the image-side surface of the second lens element is SD22, and the optical imaging lens assembly satisfies the following conditions: SD12-SD22 of more than or equal to 0.1 and less than or equal to 0.3; and TL/f is more than or equal to 0.9 and less than or equal to 1.
The conditions are as follows: 0.1< SD12-SD22<0.3, wherein the effective radius of the image side surface of the first lens element and the effective radius of the image side surface of the second lens element are limited to ensure large image height of the optical imaging lens assembly while reducing the size of the optical imaging lens assembly head to ensure high pixel count. If the optical imaging lens group exceeds the lower limit of 0.1, the head of the optical imaging lens group is too large and does not meet the design standard of a narrow forehead in some applications; if the upper limit is exceeded 0.3, the aberration of the optical imaging lens group, such as astigmatism and spherical aberration, is poor, and the imaging quality requirement cannot be met. The conditions are as follows: TL/f is more than or equal to 0.8 and less than or equal to 1, the long-focus characteristic of the optical imaging lens group is ensured, the overall length of the optical imaging lens group is shortened, and higher imaging quality is ensured.
In the above structure, through reasonable material selection, refractive power matching and combination of lens shapes, when the above specific conditions are satisfied, the optical imaging lens assembly has excellent light converging capability, thereby satisfying the high pixel requirement and simultaneously effectively reducing the total length of the optical imaging lens assembly, so as to reduce the volume of the optical imaging lens assembly and achieve the purpose of light and thin.
Referring to fig. 19 and 20, fig. 19 is a schematic diagram illustrating a vertical distance Yc32 between an inflection point on an image-side surface of a third lens element of the optical imaging lens assembly closest to the optical axis and the optical axis; FIG. 20 is a schematic diagram illustrating a vertical distance Yc52 between an inflection point on an image-side surface of the fifth lens element of the optical imaging lens assembly closest to the optical axis and the optical axis. In addition, the vertical distance between the inflection point of the third lens and the optical axis of the fifth lens is defined in the following embodiments.
The vertical distance between the image side surface boundary of the third lens element and the optical axis is Yc32, the vertical distance between the image side surface boundary of the fifth lens element and the optical axis is Yc52, and the optical imaging lens assembly satisfies the following relational expression: yc32/Yc52 is more than or equal to 1 and less than or equal to 1.5. The light height can be effectively increased by meeting the condition so as to meet the requirement of high pixel of the imaging system, and the sensitivity of the imaging system can be effectively reduced; in addition, the light ray deflection tends to be relaxed when the condition is met, and simultaneously coma aberration, distortion and chromatic aberration of the imaging system can be effectively corrected.
An air gap between the fourth lens element and the fifth lens element is T45, a thickness of the fourth lens element is CT4, a thickness of the fifth lens element is CT5, and the optical imaging lens assembly satisfies the following relations: T45/(CT4+ CT5) is not less than 0.4 and not more than 1.0. In this condition, by controlling the gap between the fourth lens element and the fifth lens element so as to satisfy the above relational expression, the optical imaging lens group can be miniaturized while the telephoto characteristic of the optical imaging lens group is ensured, and it is advantageous to ensure the assembling process of the lens elements.
The air gap on the optical axis between the third lens and the fourth lens is T34, the sum of the air gaps on the optical axis between the adjacent lenses of the first lens and the sixth lens is AAT, and the optical imaging lens group satisfies the following relations: T34/AAT is more than or equal to 0.1 and less than or equal to 0.3. Satisfying this relational expression can ensure that the lens that is close to the shot object and the lens that is close to the imaging surface distribute evenly, be favorable to the collocation between the lens. Preferably, the ratio of T34/AAT is more than or equal to 0.2 and less than or equal to 0.3.
Further, in a preferred embodiment, the optical imaging lens set satisfies the condition: T34/AAT is more than or equal to 0.2 and less than or equal to 0.3.
The effective radius of the image-side surface of the sixth lens element is SD62, the entrance pupil diameter is EPD, and the optical imaging lens assembly satisfies the following relation: SD62/EPD is more than or equal to 0.5 and less than or equal to 0.7. Satisfying this condition can suitably maintain the external diameter size and promote the light inlet volume of optical imaging lens group, helps maintaining the miniaturization of optical imaging lens group and satisfies the big light ring demand.
The optical imaging lens group has a focal length f, the first lens element has a focal length f1, the second lens element has a focal length f2, and the optical imaging lens group satisfies the following relations: the absolute value of f/f1 and the absolute value of f/f2 are more than or equal to 2.5 and less than or equal to 3.5. The condition is satisfied, so that the intensity change of the refractive power of the object side end of the optical imaging lens assembly can be effectively controlled, and the aberration correction capability of the object side end can be enhanced.
The optical imaging lens group has a focal length f and a radius of curvature R12 on the image-side surface of the sixth lens element, and the optical imaging lens group satisfies the following relation: f/R12 is more than or equal to-0.5 and less than or equal to 0. By controlling the curvature of the image-side surface of the sixth lens element, the optical imaging lens assembly is kept away from the image plane at a main point, thereby shortening the back focal length of the optical imaging lens assembly and maintaining the miniaturization of the optical imaging lens assembly.
The optical imaging lens assembly has an axial thickness of CT1 for the first lens element and an axial thickness of CT2 for the second lens element, and satisfies the following relationships: 2 is less than or equal to CT1/CT2 is less than or equal to 4. The ratio of the thickness of the first lens to the thickness of the second lens at the front end of the optical imaging lens group is adjusted, so that the total length of the lens group is favorably shortened, and the lens forming is favorably realized and the stable yield of products is ensured.
Further, in a preferred embodiment, the optical imaging lens set satisfies the condition: CT1/CT2 is more than or equal to 3 and less than or equal to 3.5.
Example one
Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating an optical imaging lens assembly according to a first embodiment of the invention, fig. 2 is graphs of astigmatism and distortion of the optical imaging lens assembly according to the first embodiment of the invention in order from left to right, and fig. 3 is a graph of spherical aberration of the optical imaging lens assembly according to the first embodiment of the invention. In fig. 1, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 101, 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 an image plane 180; in addition, the optical imaging lens assembly further includes an infrared filter 170 disposed between the sixth lens element 160 and the image plane 180, and the infrared filter 170 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 110 with positive refractive power is made of plastic; the object-side surface 111 of the first lens element 110 is convex in a paraxial region thereof, and the image-side surface 112 of the first lens element 110 is concave in a paraxial region thereof. Both surfaces thereof are aspheric.
A second lens element 120 made of plastic; 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 of the second lens element 120. Both surfaces thereof are aspheric.
A third lens element 130 made of plastic; the third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region, a concave image-side surface 132 at a paraxial region, and at least one inflection point on the image-side surface 132. Both surfaces thereof are aspheric.
The fourth lens element 140 with positive refractive power has an object-side surface 141 and an image-side surface 142 that are both aspheric.
The fifth lens element 150 with negative refractive power is made of plastic, and the image-side surface 152 of the fifth lens element 150 is concave at a paraxial region and has at least one inflection point on the image-side surface 152. The object-side surface 151 and the image-side surface 152 are aspheric.
The sixth lens element 160 is made of plastic and has negative refractive power. The object-side surface 161 and the image-side surface 162 are aspheric. The object-side surface 161 of the sixth lens element 160 is concave at a paraxial region, and the image-side surface 162 of the sixth lens element 160 is convex at a paraxial region.
The infrared filter 170 is made of glass, and is disposed between the sixth lens element 160 and the image plane 180, and does not affect the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 5.92 mm; fno 1.99; and FOV 43.48.
Please refer to the following tables 1-1, 1-2 and 1-3.
Table 1-1 shows detailed structural data of each element of the first embodiment, wherein the unit of the radius of curvature, the thickness and the focal length is mm, and surfaces 0 to 16 sequentially represent surfaces from the object side to the image side. Table 1-2 shows aspheric coefficient data in the first embodiment, wherein k represents cone coefficients in aspheric curve equations, a4, a6, A8, a10, a12, a14, a16 and aspheric coefficients of orders 4, 6, 8, 10, 12, 14 and 16 of each surface. Tables 1-3 show the conditions satisfied by the optical imaging lens assembly of the first embodiment. In addition, the following tables of the embodiments correspond to the schematic diagrams and graphs of the embodiments, and the definitions of the data in the tables are the same as those in tables 1-1, tables 1-2 and tables 1-3 of the first embodiment, which are not repeated herein.
Example two
Referring to fig. 4 to 6, fig. 4 is a schematic diagram illustrating an optical imaging lens assembly according to a second embodiment of the present disclosure, fig. 5 is a graph of astigmatism and distortion of the optical imaging lens assembly according to the second embodiment of the present disclosure, in order from left to right, and fig. 6 is a graph of spherical aberration of the optical imaging lens assembly according to the second embodiment of the present disclosure. In fig. 4, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 201, 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 an image plane 280; in addition, the optical imaging lens assembly further includes an infrared filter 270 disposed between the sixth lens element 260 and the image plane 280, and the infrared filter 270 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 210 with positive refractive power is made of plastic; the object-side surface 211 of the first lens element 210 is convex in a paraxial region and the image-side surface 212 of the first lens element 210 is concave in a paraxial region, which can effectively adjust low-order aberrations. Both surfaces thereof are aspheric.
A second lens element 220 made of plastic; the second lens element 220 with negative refractive power. The object-side surface 221 of the second lens element 220 is concave at a paraxial region thereof, and the image-side surface 122 of the second lens element is concave at a paraxial region thereof. Both surfaces thereof are aspheric.
A third lens 230 made of plastic; the third lens element 230 with positive refractive power has a convex object-side surface 231 at a paraxial region, a concave image-side surface 232 at a paraxial region, and at least one inflection point on the image-side surface 232. Both surfaces thereof are aspheric.
The fourth lens element 240 is made of plastic and has positive refractive power. The object-side surface 241 and the image-side surface 242 are aspheric.
A fifth lens element 250 made of plastic and having negative refractive power; the image-side surface 252 of the fifth lens element 250 is concave at a paraxial region thereof, and the image-side surface 252 has at least one inflection point. The object-side surface 251 and the image-side surface 252 are aspheric.
The sixth lens element 260 with negative refractive power has an object-side surface 261 and an image-side surface 262 which are both aspheric.
An object-side surface 261 of the sixth lens element 260 is concave at a paraxial region thereof, and an image-side surface 262 of the sixth lens element 260 is convex at a paraxial region thereof.
The infrared filter 270 is made of glass, and is disposed between the sixth lens element 260 and the image plane 280, and does not affect the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 6.17 mm; fno 2.00; and FOV 43.48.
Please refer to the following Table 2-1, Table 2-2 and Table 2-3.
EXAMPLE III
Referring to fig. 7 to 9, fig. 7 is a schematic diagram illustrating an optical imaging lens assembly according to a third embodiment of the present disclosure, fig. 8 is a graph of astigmatism and distortion of the optical imaging lens assembly according to the third embodiment of the present disclosure, in order from left to right, and fig. 9 is a graph of spherical aberration of the optical imaging lens assembly according to the third embodiment of the present disclosure. In fig. 7, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 301, the first lens element 310, the second lens element 320, the third lens element 330, the fourth lens element 340, the fifth lens element 350, the sixth lens element 360 and an image plane 380; in addition, the optical imaging lens assembly further includes an infrared filter 370 disposed between the sixth lens element 360 and the image plane 380, and the infrared filter 370 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 310 with positive refractive power is made of plastic; the object-side surface 311 of the first lens element 310 is convex at a paraxial region, and the image-side surface 312 of the first lens element 310 is concave at a paraxial region. Both surfaces thereof are aspheric.
A second lens element 320 made of plastic; the second lens element 320 with negative refractive power. The object-side surface 321 of the second lens element 320 is concave at a paraxial region thereof, and the image-side surface 322 of the second lens element is concave at a paraxial region thereof. Both surfaces thereof are aspheric.
A third lens element 330 made of plastic; the third lens element 330 with positive refractive power has a convex object-side surface 331 at a paraxial region, a concave image-side surface 332 at a paraxial region, and at least one inflection point on the image-side surface 332. Both surfaces thereof are aspheric.
The fourth lens element 340 is made of plastic and has positive refractive power, thereby improving the imaging quality. The object-side surface 341 and the image-side surface 342 are aspheric.
A fifth lens element 350 made of plastic and having negative refractive power; the image-side surface 352 of the fifth lens element 350 is concave at a paraxial region and the image-side surface 352 has at least one inflection point. The object-side surface 351 and the image-side surface 352 are aspheric.
The sixth lens element 360 is made of plastic and has negative refractive power. The object-side surface 361 and the image-side surface 362 are aspheric.
The object-side surface 361 of the sixth lens element 360 is concave at a paraxial region thereof, and the image-side surface 362 of the sixth lens element 360 is convex at a paraxial region thereof.
The infrared filter 370 is made of glass, and is disposed between the sixth lens element 360 and the image plane 380, and does not affect the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 6.16 mm; fno 1.99; and FOV 43.48.
Please refer to the following Table 3-1, Table 3-2 and Table 3-3.
Example four
Referring to fig. 10 to 12, fig. 10 is a schematic view illustrating an optical imaging lens assembly according to a fourth embodiment of the invention, fig. 11 is graphs of astigmatism and distortion of the optical imaging lens assembly according to the fourth embodiment of the invention in order from left to right, and fig. 12 is a graph of spherical aberration of the optical imaging lens assembly according to the fourth embodiment of the invention. In fig. 10, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 401, the first lens element 410, the second lens element 420, the third lens element 430, the fourth lens element 440, the fifth lens element 450, the sixth lens element 460 and an image plane 480; in addition, the optical imaging lens assembly further includes an infrared filter 470 disposed between the sixth lens element 460 and the image plane 480, wherein the infrared filter 470 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 410 with positive refractive power is made of plastic; the object-side surface 411 of the first lens element 410 is convex at a paraxial region, and the image-side surface 412 of the first lens element 410 is concave at a paraxial region. Both surfaces thereof are aspheric.
A second lens 420 made of plastic; the second lens element 420 has negative refractive power. The object-side surface 421 of the second lens element 420 is concave at a paraxial region thereof, and the image-side surface 422 of the second lens element is concave at a paraxial region thereof. Both surfaces thereof are aspheric.
A third lens 430 made of plastic; the third lens element 430 with positive refractive power has a convex object-side surface 431 at a paraxial region, a concave image-side surface 432 at a paraxial region, and at least one inflection point on the image-side surface 432. Both surfaces thereof are aspheric.
The fourth lens element 440 with positive refractive power is made of plastic. The object-side surface 441 and the image-side surface 442 are aspheric.
A fifth lens element 450 made of plastic and having negative refractive power; the image-side surface 452 of the fifth lens element 450 is concave at a paraxial region and has at least one inflection point on the image-side surface 452. The object-side surface 451 and the image-side surface 452 are aspheric.
The sixth lens element 460 with negative refractive power is made of plastic. The object-side surface 461 and the image-side surface 462 are aspheric.
The object-side surface 461 of the sixth lens element 460 is concave in a paraxial region, and the image-side surface 462 of the sixth lens element 460 is convex in a paraxial region.
The infrared filter 470 is made of glass, and is disposed between the sixth lens element 460 and the image plane 480, and does not affect the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 5.77 mm; fno 1.99; and FOV 43.48.
Please refer to the following Table 4-1, Table 4-2 and Table 4-3.
EXAMPLE five
Referring to fig. 13 to 15, fig. 13 is a schematic view illustrating an optical imaging lens assembly according to a fifth embodiment of the present invention, fig. 14 is graphs of astigmatism and distortion of the optical imaging lens assembly according to the fifth embodiment of the present invention in order from left to right, and fig. 15 is a graph of spherical aberration of the optical imaging lens assembly according to the fifth embodiment of the present invention. In fig. 13, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 501, 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 an image plane 580; in addition, the optical imaging lens assembly further includes an infrared filter 570 disposed between the sixth lens element 560 and the image plane 580, and the infrared filter 570 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 510 with positive refractive power is made of plastic; the object-side surface 511 of the first lens element 510 is convex at a paraxial region, and the image-side surface 512 of the first lens element 510 is concave at a paraxial region. Both surfaces thereof are aspheric.
A second lens 520 made of plastic; the second lens element 520 with negative refractive power. The object-side surface 521 of the second lens element 520 is concave at a paraxial region thereof, and the image-side surface 522 of the second lens element is concave at a paraxial region thereof. Both surfaces thereof are aspheric.
A third lens 530 made of plastic; the third lens element 530 with positive refractive power has a convex object-side surface 531 at a paraxial region, a concave image-side surface 532 at a paraxial region, and at least one inflection point on the image-side surface 532. Both surfaces thereof are aspheric.
The fourth lens element 540 is made of plastic and has positive refractive power, so that the refractive power distribution can be effectively dispersed to avoid excessive aberration, thereby improving the imaging quality. The object-side surface 541 and the image-side surface 542 are aspheric.
A fifth lens element 550 made of plastic and having negative refractive power; the image-side surface 552 of the fifth lens element 550 is concave at a paraxial region and the image-side surface 552 has at least one inflection point. The object-side surface 551 and the image-side surface 552 are aspheric.
The sixth lens element 560 with negative refractive power is made of plastic. The object-side surface 561 and the image-side surface 562 are aspheric.
The object-side surface 561 of the sixth lens element 560 is concave in a paraxial region thereof, and the image-side surface 562 of the sixth lens element 560 is convex in a paraxial region thereof.
The infrared filter 570 is made of glass, and is disposed between the sixth lens element 560 and the image plane 580, and does not affect the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 5.98 mm; fno 1.99; and FOV 43.48.
Please refer to the following Table 5-1, Table 5-2 and Table 5-3.
EXAMPLE six
Referring to fig. 16 to 18, fig. 16 is a schematic view illustrating an optical imaging lens assembly according to a sixth embodiment of the invention, fig. 17 is graphs of astigmatism and distortion of the optical imaging lens assembly according to the sixth embodiment of the invention in order from left to right, and fig. 18 is a graph of spherical aberration of the optical imaging lens assembly according to the sixth embodiment of the invention. In fig. 16, the optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop 601, the first lens element 610, the second lens element 620, the third lens element 630, the fourth lens element 640, the fifth lens element 650, the sixth lens element 660 and an image plane 680; in addition, the optical imaging lens assembly further includes an infrared filter 670 disposed between the sixth lens element 660 and the image plane 680, and the infrared filter 670 does not affect the focal length of the optical imaging lens assembly.
The optical imaging lens assembly comprises six lens elements with refractive power.
The first lens element 610 with positive refractive power is made of plastic; the object-side surface 611 of the first lens element 610 is convex in a paraxial region, and the image-side surface 612 of the first lens element 610 is concave in a paraxial region. Both surfaces thereof are aspheric.
A second lens 620 made of plastic; the second lens element 620 has negative refractive power. The object-side surface 621 of the second lens element 620 is concave in a paraxial region thereof, and the image-side surface 622 of the second lens element is concave in a paraxial region thereof. Both surfaces thereof are aspheric.
A third lens 630 made of plastic; the third lens element 630 with positive refractive power has a convex object-side surface 631 at a paraxial region, a concave image-side surface 632 at a paraxial region, and at least one inflection point on the image-side surface 632. Both surfaces thereof are aspheric.
The fourth lens element 640 is made of plastic and has positive refractive power. The object-side surface 641 and the image-side surface 642 are aspheric.
A fifth lens element 650 made of plastic and having negative refractive power; the image-side surface 652 of the fifth lens element 650 is concave at a paraxial region thereof, and the image-side surface 652 has at least one inflection point. The object-side surface 651 and the image-side surface 652 are aspheric.
The sixth lens element 660 with negative refractive power is made of plastic. The object-side surface 661 and the image-side surface 662 are aspheric. An object-side surface 661 of the sixth lens element 660 is concave at a paraxial region thereof, and an image-side surface 662 of the sixth lens element 660 is convex at a paraxial region thereof.
The infrared filter 670 is made of glass, and is disposed between the sixth lens element 660 and the image plane 680 without affecting the focal length of the optical imaging lens assembly.
In this embodiment, the focal length of the optical imaging lens assembly is F, the aperture value (F-number) is Fno, and the field of view angle is FOV, which are as follows: f is 5.91 mm; fno 1.99; and FOV 43.48.
Please refer to the following Table 6-1, Table 6-2 and Table 6-3.
EXAMPLE seven
Based on the foregoing embodiments, the present embodiment provides an image capturing apparatus, including the optical imaging lens assembly provided in the foregoing embodiments, for being adapted in various electronic apparatuses. In the optical imaging lens group, the surface shape structure of each lens is matched with the optical parameters, so that high-order imaging quality is ensured, high imaging quality can be maintained on the premise of effectively shortening the system length, the optical imaging lens group has long-focus characteristics and meets the telephoto requirement, and the camera device using the optical imaging lens group is light and thin in size and convenient to carry.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising:
the first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and has at least one inflection point on the image-side surface;
a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface at a paraxial region;
the fifth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface; and
a sixth lens element with negative refractive power having a concave object-side surface and a convex image-side surface at a paraxial region;
the surfaces of the object side and the image side of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric;
the optical imaging lens assembly has a focal length f, an axial distance TL from the object-side surface of the first lens element to the image plane, an effective radius SD12 of the image-side surface of the first lens element, and an effective radius SD22 of the image-side surface of the second lens element, wherein the optical imaging lens assembly satisfies the following conditions:
SD12-SD22 of more than or equal to 0.1 and less than or equal to 0.3; and
0.9≤TL/f≤1。
2. the optical imaging lens group of claim 1 wherein the vertical distance between the image side surface boundary of the third lens element and the optical axis is Yc32 and the vertical distance between the image side surface boundary of the fifth lens element and the optical axis is Yc52, wherein the optical imaging lens group satisfies the following relationship:
1≤Yc32/Yc52≤1.5。
3. the optical imaging lens assembly of claim 1 wherein the air gap on the optical axis between the fourth lens element and the fifth lens element is T45, the thickness of the fourth lens element on the optical axis is CT4, the thickness of the fifth lens element on the optical axis is CT5, and the optical imaging lens assembly satisfies the following relationship:
0.4≤T45/(CT4+CT5)≤1.0。
4. the optical imaging lens assembly of claim 1 wherein the air gap on the optical axis between the third lens and the fourth lens is T34, the sum of the air gaps on the optical axis between the adjacent first lens and the sixth lens is AAT, and the optical imaging lens assembly satisfies the following relationship:
0.1≤T34/AAT≤0.3。
5. the optical imaging lens assembly of claim 1 wherein the image-side surface of the sixth lens element has an effective radius SD62 and an entrance pupil diameter EPD, and the optical imaging lens assembly satisfies the following relationship:
0.5≤SD62/EPD≤0.7。
6. the set of optical imaging lenses of claim 1, wherein the focal length of the set of optical imaging lenses is f, the focal length of the first lens is f1, the focal length of the second lens is f2, and the set of optical imaging lenses satisfies the following relationship:
2.5≤|f/f1|+|f/f2|≤3.5。
7. the optical imaging lens group of claim 1, wherein the optical imaging lens group has a focal length f and a radius of curvature R12 on the image-side surface of the sixth lens element, and the optical imaging lens group satisfies the following relationship:
-0.5≤f/R12≤0。
8. the optical imaging lens assembly of claim 1 wherein the first lens element has an optical axis thickness CT1 and the second lens element has an optical axis thickness CT2, the optical imaging lens assembly satisfies the following relationship:
2≤CT1/CT2≤4。
9. an image pickup device comprising the optical imaging lens assembly as claimed in any one of claims 1 to 8.
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| DE102021103587B4 (en) | 2021-02-16 | 2022-09-29 | Carl Zeiss Ag | Compact telephoto lens with anomalous relative partial dispersion materials, camera and mobile device |
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