CN114518645A - Optical lens - Google Patents
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- CN114518645A CN114518645A CN202210217322.6A CN202210217322A CN114518645A CN 114518645 A CN114518645 A CN 114518645A CN 202210217322 A CN202210217322 A CN 202210217322A CN 114518645 A CN114518645 A CN 114518645A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical lens, which comprises a front lens group, a movable lens group and a rear lens group, wherein the focal length of the front lens group satisfies 1.5 < (f1 f2)/f3 < 3; the fourth lens and the fifth lens form a first cemented lens group with positive focal power, and the movable lens group comprises a sixth lens with positive focal power. According to the optical lens provided by the embodiment of the invention, by setting the number of the lenses of the front lens group and the movable lens group, the focal length of each lens group and the focal power of each lens are reasonably matched, and the fourth lens and the fifth lens are arranged to be cemented, so that the aberration balance can be effectively realized, the image definition is ensured, and meanwhile, the requirements of a spherical screen movie are met, and a larger target surface and a smaller breathing effect can be realized while a large field angle is met.
Description
Technical Field
The invention relates to the technical field of optical devices, in particular to an optical lens.
Background
With the development of science and technology, the living standard of people is increasingly improved, and people change from pursuit of material level to pursuit of mental demand. Going to cinema consumption has become a fashion of people, from 2D to 3D, to 4D, 5D, etc. In another projection mode, a ball screen movie is also becoming a development trend. The ball screen shows people to have a feeling of being personally on the scene.
In order to obtain the vivid effect in the real world, a lens with 180-degree fish eye, an ultra-large target surface, high resolution, good projection distortion effect and nearly no respiratory effect is needed. However, most of the existing fisheye lenses are photographic lenses with target surfaces in APS pictures, the target surfaces are small, the breathing effect is obvious, and other movie lenses have no similar angle.
Disclosure of Invention
The invention provides an optical lens which can meet the requirements of a large target surface and a lower breathing effect while ensuring a large field angle.
The invention provides an optical lens, which comprises a front lens group, a movable lens group and a rear lens group which are sequentially arranged from an object side to an image side along an optical axis;
the front lens group and the rear lens group are fixedly arranged, and the movable lens group is movably arranged along the optical axis direction;
the front lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis;
the movable lens group comprises a sixth lens;
the focal length of the front lens group is f1, the focal length of the movable lens group is f2, and the focal length of the rear lens group is f3, wherein 1.5 < (f1 x f2)/f3 is less than 3;
the first lens has a negative optical power, the second lens has a negative optical power, and the third lens has a negative optical power;
The fourth lens and the fifth lens form a first cemented lens group, and the first cemented lens group has positive focal power;
the sixth lens has positive optical power.
Optionally, f1 is more than or equal to-20 mm and less than or equal to-50 mm, f2 is more than or equal to 30mm and less than or equal to 55mm, and f3 is more than or equal to-500 mm and less than or equal to 800 mm.
Optionally, the rear lens group includes a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens, which are sequentially arranged from the object side to the image side along the optical axis;
the seventh lens and the eighth lens constitute a second cemented lens group, the ninth lens and the tenth lens constitute a third cemented lens group, and the eleventh lens and the twelfth lens constitute a fourth cemented lens group.
Optionally, the second cemented lens group has positive power, the third cemented lens group has negative power, and the fourth cemented lens group has positive power.
Optionally, an object-side surface of the ninth lens element is aspheric, an image-side surface of the tenth lens element is aspheric, and an image-side surface of the twelfth lens element is aspheric.
Optionally, the third lens, the seventh lens, the tenth lens, and the eleventh lens are ED glass lenses.
Optionally, the refractive index of the first lens is N1, and the abbe number is v 1; the refractive index of the second lens is N2, and the Abbe number is v 2; the refractive index of the third lens is N3, and the Abbe number is v 3; the refractive index of the fourth lens is N4, and the Abbe number is v 4; the refractive index of the fifth lens is N5, and the Abbe number is v 5; the refractive index of the sixth lens is N6, and the Abbe number is v 6; the refractive index of the seventh lens is N7, and the Abbe number is v 7; the refractive index of the eighth lens is N8, and the Abbe number is v 8; the refractive index of the ninth lens is N9, and the Abbe number is v 9; the refractive index of the tenth lens is N10, and the Abbe number is v 10; the refractive index of the eleventh lens is N11, and the Abbe number is v 11; the refractive index of the twelfth lens is N12, and the Abbe number is v 12;
wherein N1 is more than 1.5 and less than 2.1, and v1 is more than 25 and less than 40; n2 is more than 1.5 and less than 2.1, v2 is more than 15 and less than 20;
1.5＜N3＜1.65，65＜v3＜70；1.5<N4＜2，25＜v4＜35；
1.85＜N5＜2.15，20＜v5＜25；1.65＜N6＜1.95，20＜v6＜25；
1.5＜N7＜1.65，65＜v7＜70；1.5＜N8＜1.7，50＜v8＜60；
1.85＜N9＜2.1，20＜v9＜27；1.5＜N10＜1.65，65＜v10＜70；
1.5＜N11＜1.65，65＜v11＜70；1.9＜N12＜2.1，22＜v12＜28。
optionally, the first lens element is a meniscus lens element, and has a convex object-side surface and a concave image-side surface;
the second lens is a meniscus lens, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens is a biconvex lens; the fourth lens is a biconvex lens;
the fifth lens is a biconcave lens; the sixth lens is a biconvex lens;
The seventh lens element is a meniscus lens element with a concave object-side surface and a convex image-side surface;
the eighth lens is a meniscus lens, the object side of the eighth lens is a concave surface, and the image side of the eighth lens is a convex surface;
the object side surface of the ninth lens is a concave surface, and the image side surface of the ninth lens is a concave surface;
the object side surface of the tenth lens element is a convex surface, and the image side surface of the tenth lens element is a convex surface;
the eleventh lens is a biconvex lens;
the object side surface of the twelfth lens element is a concave surface, and the image side surface of the twelfth lens element is a convex surface.
Optionally, the optical lens further includes a diaphragm;
the diaphragm is positioned in a light path between the movable mirror group and the rear mirror group.
Optionally, the center thickness of the first lens is D1, the center thickness of the second lens is D2, the center thickness of the third lens is D3, the center thickness of the fourth lens is D4, the center thickness of the fifth lens is D5, the center thickness of the sixth lens is D6, the center thickness of the seventh lens is D7, the center thickness of the eighth lens is D8, the center thickness of the ninth lens is D9, the center thickness of the tenth lens is D10, the center thickness of the eleventh lens is D11, and the center thickness of the twelfth lens is D12; an air gap distance between the first lens and the second lens is C1, an air gap distance between the second lens and the third lens is C2, an air gap distance between the third lens and the fourth lens is C3, an air gap distance between the fifth lens and the sixth lens is C4, an air gap distance between the sixth lens and the stop is C5, an air gap distance between the stop and the seventh lens is C6, an air gap distance between the eighth lens and the ninth lens is C7, and an air gap distance between the tenth lens and the eleventh lens is C8;
Wherein D1 is more than or equal to 8mm and less than or equal to 15mm, D2 is more than or equal to 13mm and less than or equal to 20mm, D3 is more than or equal to 3mm and less than or equal to 8mm, D4 is more than or equal to 15mm and less than or equal to 30mm, D5 is more than or equal to 1mm and less than or equal to 3mm, D6 is more than or equal to 2mm and less than or equal to 5mm, D7 is more than or equal to 8mm and less than or equal to 15mm, D8 is more than or equal to 8mm and less than or equal to 18mm, D9 is more than or equal to 1mm and less than or equal to 3mm, D10 is more than or equal to 8mm and less than or equal to 15mm, D11 is more than or equal to 10mm and less than or equal to 20mm, and D12 is more than or equal to 1mm and less than or equal to 3 mm;
10mm≤C1≤20mm，15mm≤C2≤30mm，5mm≤C3≤15mm，10mm≤C4≤20mm，2mm≤C5≤3.5mm，4mm≤C6≤6mm，0.05mm≤C7≤0.3mm，0.1mm≤C8≤0.5mm。
the optical lens provided by the embodiment of the invention comprises a front lens group, a movable lens group and a rear lens group which are sequentially arranged from an object side to an image side along an optical axis, the focal length of each lens group and the focal power of each lens are reasonably matched by setting the number of the lenses of the front lens group and the movable lens group, and a fourth lens and a fifth lens are arranged to form a first cemented lens group, so that the aberration balance can be effectively realized, the image definition is ensured, meanwhile, a large target surface and a small breathing effect can be realized while a large field angle is met, and the requirements of a ball screen movie are met.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
fig. 2 is an MTF diagram of an optical lens according to an embodiment of the present invention;
fig. 3 is a dot-column diagram of an optical lens according to an embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of an optical lens according to an embodiment of the present invention;
fig. 5 is a field curvature distortion diagram of an optical lens according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention, and as shown in fig. 1, the optical lens according to the embodiment of the present invention includes a front lens group 11, a movable lens group 12, and a rear lens group 13, which are sequentially arranged from an object side to an image side along an optical axis, where the front lens group 11 and the rear lens group 13 are fixedly disposed, and the movable lens group 12 is movably disposed along the optical axis. The front lens group 11 includes a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, and a fifth lens element 150 arranged in sequence from the object side to the image side along the optical axis, and the movable lens group 12 includes a sixth lens element 160. Focal length of front mirror group 11 is f1, focal length of movable mirror group 12 is f2, and focal length of rear mirror group 13 is f3, wherein 1.5 < (f1 × f2)/f3 < 3. The first lens 110 has negative power, the second lens 120 has negative power, the third lens 130 has negative power, the fourth lens 140 and the fifth lens 150 constitute a first cemented lens group 21, the first cemented lens group 21 has positive power, and the sixth lens 160 has positive power.
In the optical lens system provided in this embodiment, the front lens group 11, the movable lens group 12 and the rear lens group 13 may be disposed in a lens barrel (not shown in fig. 1). The front lens group 11 and the rear lens group 13 are fixed in position in the lens cone, and at this time, the front lens group 11 and the rear lens group 13 are fixed relative to the image plane. The movable lens group 12 can move back and forth along the optical axis in the lens cone, and the movable lens group 12 can perform a focusing function.
It can be understood that, in the process of focusing by moving the movable lens group 12, the optical lenses have different focal lengths and focal powers, and also have different lengths or shapes.
Furthermore, the focal power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, and the value is the reciprocal of the focal length, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending capability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending capability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together.
In the present embodiment, by arranging front lens group 11 including first lens element 110, second lens element 120, third lens element 130, fourth lens element 140 and fifth lens element 150 arranged in order from the object side to the image side, moving lens group 12 including sixth lens element 160, first lens element 110 having negative refractive power, second lens element 120 having negative refractive power, third lens element 130 having negative refractive power, fourth lens element 140 and fifth lens element 150 constituting first cemented lens group 21, first cemented lens group 21 having positive refractive power, sixth lens element 160 having positive refractive power, focal length f1 of front lens group 11, focal length f2 of moving lens group 12 and focal length f3 of rear lens group 13 satisfying 1.5 < (f1 x f2)/f3 < 3, the focal lengths of front lens group 11, moving lens group 12 and rear lens group 13 are reasonably allocated, and the focal lengths of the respective lenses of front lens group 11 and moving lens group 12 are matched with each other, so as to compensate the aberration caused in the moving process of the movable mirror group 12, effectively realize aberration balance and ensure the clarity of the image.
Wherein, by arranging the fourth lens 140 and the fifth lens 150 to constitute the first cemented lens group 21, the air space between the fourth lens 140 and the fifth lens 150 can be effectively reduced, thereby further reducing the total lens length. In addition, the first cemented lens group 21 can reduce chromatic aberration or eliminate chromatic aberration to the utmost extent, so that various aberrations of the zoom lens can be fully corrected, on the premise of compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illumination intensity can be improved, the image quality can be improved, and the imaging definition of the lenses can be improved. In addition, the use of the first cemented lens group 21 can also reduce the number of assembling parts between lenses, simplify the assembling procedure in the lens manufacturing process, reduce the cost, and reduce the tolerance sensitivity problem of the lens unit due to inclination/decentration generated in the assembling process.
Meanwhile, the field angle FOV of the optical lens provided by the embodiment of the invention is larger than 180 degrees, so that the requirement of a large field angle can be met; the maximum target surface is larger than 83mm, compared with the existing optical lens, the target surface is increased, in addition, the optical lens adopts an internal focusing mode, the focusing is realized only through the movement of a group of movable lens group 12, in the process that the object distance is changed from infinity to 2m, the movement amount of the movable lens group 12 is smaller than 0.2mm, the breathing effect can be greatly improved through a smaller movement stroke, the effect of small breathing effect is achieved, and the requirements of large target surface and lower breathing effect are met while the large visual field angle is ensured.
In summary, the optical lens provided in the embodiment of the present invention includes the front lens group 11, the movable lens group 12, and the rear lens group 13 sequentially arranged from the object side to the image side along the optical axis, the focal lengths of the lens groups and the focal powers of the lenses are reasonably matched by setting the number of the lenses of the front lens group 11 and the movable lens group 12, and the fourth lens 140 and the fifth lens 150 are arranged to form the first cemented lens group 21, so that the aberration balance can be effectively achieved, the image clarity can be ensured, and meanwhile, while a large field angle is satisfied, a large target surface and a small breathing effect can be achieved, and the requirements of a ball-screen movie are satisfied.
As a feasible implementation mode, the thickness of the film is-20 mm-f 1-50 mm, 30 mm-f 2-55 mm, and-500 mm-f 3-800 mm.
By reasonably setting the focal length ranges of the front lens group 11, the movable lens group 12 and the rear lens group 13, the distortion can be reduced, the image quality can be improved, and the imaging definition of the lens can be improved.
As a possible embodiment, as shown in fig. 1, the rear lens group 13 includes a seventh lens 170, an eighth lens 180, a ninth lens 190, a tenth lens 200, an eleventh lens 210, and a twelfth lens 220 arranged in this order from the object side to the image side along the optical axis, the seventh lens 170 and the eighth lens 180 constitute a second cemented lens group 22, the ninth lens 190 and the tenth lens 200 constitute a third cemented lens group 23, and the eleventh lens 210 and the twelfth lens 220 constitute a fourth cemented lens group 24.
Wherein, by disposing the seventh lens 170 and the eighth lens 180 to constitute the second cemented lens group 22, the ninth lens 190 and the tenth lens 200 to constitute the third cemented lens group 23, and the eleventh lens 210 and the twelfth lens 220 to constitute the fourth cemented lens group 24, the air space between the seventh lens 170 and the eighth lens 180, between the ninth lens 190 and the tenth lens 200, and between the eleventh lens 210 and the twelfth lens 220 can be effectively reduced, thereby further reducing the total lens length.
In addition, the second cemented lens group 22, the third cemented lens group 23 and the fourth cemented lens group 24 can reduce chromatic aberration or eliminate chromatic aberration to the utmost extent, so that various aberrations of the optical lens can be fully corrected, on the premise of compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illumination intensity can be improved, the image quality can be improved, and the imaging definition of the lens can be improved.
In addition, the use of the second, third and fourth cemented lens groups 22, 23 and 24 can also reduce the number of assembly parts between the three lenses, simplify the assembly procedure in the lens manufacturing process, reduce the cost, and reduce tolerance sensitivity problems of lens units due to tilt/decentration during assembly.
As a possible embodiment, the second cemented lens group 22 has positive power, the third cemented lens group 23 has negative power, and the fourth cemented lens group 24 has positive power.
The reasonable arrangement of the focal powers of the second cemented lens group 22, the third cemented lens group 23 and the fourth cemented lens group 24 helps to reduce distortion, improve image quality and improve the imaging definition of the lens.
In one possible embodiment, the object-side surface of the ninth lens element 190 is aspheric, the image-side surface of the tenth lens element 200 is aspheric, and the image-side surface of the twelfth lens element 220 is aspheric.
The object-side surface of the ninth lens element 190, the image-side surface of the tenth lens element 200, and the image-side surface of the twelfth lens element 220 are aspheric, so that the total length can be reduced, and the resolution of the lens imaging can be improved.
Optionally, the image-side surface of the ninth lens 190 is a standard surface (spherical surface), and the curvature radius of the standard surface is 50-65 mm; the object side surface of the ninth lens element 190 is an even-order aspheric surface, and the even-order equation of the ninth lens element satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the fitting sphere, c is 1/R, and R represents the paraxial curvature radius of the mirror surface; k is a conic coefficient; a is 2、a4、a6、a8、a10、a12、a14Are high-order aspheric coefficients.
Wherein the curvature radius R in the even equation is in the range of-40 to-70 mm, k is 0, a2＝0，a4In the range of (-1.5 to-4) E-5, i.e., -1.5 x 10-5～-4*10-5；a6In the range of (-1 to-2.5) E-8, i.e., -1 x 10-8～-2.5*10-8；a8In the range of (-7 to-10) E-11, i.e., -7 to 10-11～-10*10-11；a10In the range of (3-5) E-13, i.e. 3 x 10-13～5*10-13；a12In the range of (-1.5 to-3) E-15, i.e., -1.5 x 10-15～-3*10-15；a14In the range of (2.5-4.5) E-18, i.e. 2.5 x 10-18～4.5*10-18。
Optionally, the object-side surface of the tenth lens element 200 is a standard surface (spherical surface), and the curvature radius thereof is 50-65 mm; the image-side surface of the tenth lens element 200 is an even-order aspheric surface, and the even-order equation of the tenth lens element satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the fitting sphere, c is 1/R, and R represents the paraxial curvature radius of the mirror surface; k is a conic coefficient; a is2、a4、a6、a8、a10、a12、a14Are high-order aspheric coefficients.
Wherein the curvature radius R in the even equation is in the range of-100 to-200 mm, k is in the range of-80 to-110, a2＝0，a4In the range of (-1.5 to-3) E-5, i.e., -1.5 x 10-5～-3*10-5；a6In the range of (3.5-5) E-9, i.e. 3.5 x 10-9～5*10-9；a8In the range of (-0.5 to-2) E-11, i.e., -0.5 x 10-11～-2*10-11；a10In the range of (-4.5 to-6.5) E-14, i.e., -4.5 x 10-14～-6.5*10-14；a12In the range of (1-2.5) E-16, i.e. 1 x 10-16～2.5*10-16；a14In the range of (-1.5 to-3.5) E-19, i.e., -1.5 x 10 -19～-3.5*10-19。
Optionally, the object-side surface of the twelfth lens element 220 is a standard surface (spherical surface), and the curvature radius thereof ranges from-25 mm to-50 mm; the image-side surface of the twelfth lens element 220 is an even-order aspheric surface, and the even-order equation of the twelfth lens element satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the fitting sphere, c is 1/R, and R represents the paraxial curvature radius of the mirror surface; k is a conic coefficient; a is2、a4、a6、a8、a10、a12、a14Are high-order aspheric coefficients.
Wherein the curvature radius R in the even equation is in the range of-100 to-200 mm, k is 0, a2＝0，a4In the range of (3.5-5) E-7, i.e. 3.5 x 10-7～5*10-7；a6In the range of (1-3) E-9, i.e. 1 x 10-9～3*10-9；a8In the range of (-2.5 to-4) E-12, i.e., -2.5 x 10-12～-4*10-12；a10Is in the range (-0.5 to-2) E-15, i.e., -0.5 x 10-15～-2*10-15；a12In the range of (3-5) E-18, i.e. 3 x 10-18～5*10-18；a14In the range of (-1 to-3) E-21, i.e., -1 to 10-21～-3*10-21。
In the present embodiment, the ninth lens 190, the tenth lens 200, and the twelfth lens 220 are aspheric, and by setting the aspheric surface, the high-order aberration can be corrected, the resolution of the lens image can be improved, and the total length can be reduced.
Optionally, the object-side surface and the image-side surface of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, the seventh lens element 170, the eighth lens element 180, and the eleventh lens element 210 are all standard surfaces (spherical surfaces), which helps to reduce cost.
As a possible embodiment, the third lens 130, the seventh lens 170, the tenth lens 200, and the eleventh lens 210 are ED glass lenses.
Among them, the ED glass (i.e., Extra-low Dispersion) is ultra-low Dispersion glass, can reduce the chromatic aberration of the lens to the maximum, and has the characteristics of low refractive index and low Dispersion.
In the present embodiment, by providing the third lens 130, the seventh lens 170, the tenth lens 200, and the eleventh lens 210 as ED glass lenses, chromatic aberration can be eliminated to achieve a good chromatic aberration correction effect.
Alternatively, glass lenses are used for the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160, the eighth lens 180, the ninth lens 190, and the twelfth lens 220. The glass lens has a strong light turning capability, and the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160, the eighth lens 180, the ninth lens 190 and the twelfth lens 220 are glass lenses, so that the number of lenses can be reduced, and the size of the lens can be reduced.
As a possible embodiment, the refractive index of the first lens 110 is N1, the abbe number is v 1; the refractive index of the second lens 120 is N2, and the abbe number is v 2; the refractive index of the third lens 130 is N3, and the Abbe number is v 3; the refractive index of the fourth lens 140 is N4, and the abbe number is v 4; the refractive index of the fifth lens 150 is N5, and the abbe number is v 5; the refractive index of the sixth lens 160 is N6, and the abbe number is v 6; the refractive index of the seventh lens 170 is N7, and the abbe number is v 7; the refractive index of the eighth lens 180 is N8, and the abbe number is v 8; the refractive index of the ninth lens 190 is N9, and the abbe number is v 9; the tenth lens 200 has a refractive index of N10 and an abbe number of v 10; the refractive index of the eleventh lens 210 is N11, and the abbe number is v 11; the refractive index of the twelfth lens 220 is N12, and the abbe number is v 12;
Wherein N1 is more than 1.5 and less than 2.1, v1 is more than 25 and less than 40; n2 is more than 1.5 and less than 2.1, v2 is more than 15 and less than 20;
1.5＜N3＜1.65，65＜v3＜70；1.5<N4＜2，25＜v4＜35；
1.85＜N5＜2.15，20＜v5＜25；1.65＜N6＜1.95，20＜v6＜25；
1.5＜N7＜1.65，65＜v7＜70；1.5＜N8＜1.7，50＜v8＜60；
1.85＜N9＜2.1，20＜v9＜27；1.5＜N10＜1.65，65＜v10＜70；
1.5＜N11＜1.65，65＜v11＜70；1.9＜N12＜2.1，22＜v12＜28。
the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The abbe number is an index for expressing the dispersion capability of the transparent medium, and the more severe the dispersion of the medium is, the smaller the abbe number is; conversely, the more slight the dispersion of the medium, the greater the abbe number. Therefore, the refractive index and the Abbe number of each lens in the optical lens are matched and arranged, so that the miniaturization design of the optical lens is facilitated; meanwhile, the method is favorable for improving the image quality and realizing higher pixel resolution.
As a possible implementation, as shown in FIG. 1, the first lens element 110 is a meniscus lens element with a convex object-side surface and a concave image-side surface; the second lens element 120 is a meniscus lens element with a convex object-side surface and a concave image-side surface; the third lens 130 is a biconvex lens; the fourth lens 140 is a biconvex lens; the fifth lens 150 is a biconcave lens; the sixth lens 160 is a biconvex lens; the seventh lens element 170 is a meniscus lens element with a concave object-side surface and a convex image-side surface; the eighth lens element 180 is a meniscus lens element with a concave object-side surface and a convex image-side surface; the object-side surface of the ninth lens element 190 is concave, and the image-side surface of the ninth lens element 190 is concave; the object-side surface of the tenth lens element 200 is convex, and the image-side surface of the tenth lens element 200 is convex; the eleventh lens 210 is a biconvex lens; the object-side surface of the twelfth lens element 220 is concave, and the image-side surface of the twelfth lens element 220 is convex.
The surface type of each lens is reasonably arranged, so that the focal power and the focal length of each lens meet the requirements of the focal power and the focal length in the embodiment, the whole optical lens is compact in structure, and the integration degree of the optical lens is high.
Furthermore, the curvature radius of the object side surface of the first lens element 110 is 80-110 mm, and the curvature radius of the image side surface of the first lens element 110 is 40-60 mm; the curvature radius of the object side surface of the second lens 120 is 80-110 mm, and the curvature radius of the image side surface of the second lens 120 is 25-35 mm; the curvature radius of the object side surface of the third lens 130 ranges from-150 mm to-200 mm, and the curvature radius of the image side surface of the third lens 130 ranges from 30mm to 50 mm; the curvature radius of the object side surface of the fourth lens 140 ranges from 50mm to 80mm, and the curvature radius of the image side surface of the fourth lens 140 ranges from-20 mm to-40 mm; the curvature radius of the object side surface of the fifth lens 150 ranges from-20 to-40 mm, and the curvature radius of the image side surface of the fifth lens 150 ranges from 500 to infinity mm; the curvature radius of the object-side surface of the sixth lens 160 ranges from 30mm to 50mm, the curvature radius of the image-side surface of the sixth lens 160 ranges from-100 mm to-200 mm, the curvature radius of the object-side surface of the seventh lens 170 ranges from-40 mm to-60 mm, and the curvature radius of the image-side surface of the seventh lens 170 ranges from-8 mm to-20 mm; the curvature radius of the object side surface of the eighth lens 180 ranges from-8 mm to-20 mm, and the curvature radius of the image side surface of the eighth lens 180 ranges from-15 mm to-30 mm; the curvature radius of the object-side surface of the eleventh lens 210 ranges from 70 mm to 100mm, and the curvature radius of the image-side surface of the eleventh lens 210 ranges from-25 mm to-50 mm.
The surface type and the curvature radius of each lens are reasonably set, so that the focal power and the focal length of each lens meet the focal power and the focal length requirements in the embodiment, the whole optical lens can be further guaranteed to be compact in structure, and the integration degree of the optical lens is high.
As a possible embodiment, as shown in fig. 1, the optical lens further includes a diaphragm 300, and the diaphragm 300 is located in the optical path between the movable mirror group 12 and the rear mirror group 13.
The diaphragm 300 can be additionally arranged to adjust the propagation direction of the light beam, which is beneficial to improving the imaging quality. The stop 300 may be located in the optical path between the movable mirror group 12 and the rear mirror group 13, but the specific location of the stop 300 is not limited in the embodiment of the present invention.
As a possible embodiment, the center thickness of the first lens 110 is D1, the center thickness of the second lens 120 is D2, the center thickness of the third lens 130 is D3, the center thickness of the fourth lens 140 is D4, the center thickness of the fifth lens 150 is D5, the center thickness of the sixth lens 160 is D6, the center thickness of the seventh lens 170 is D7, the center thickness of the eighth lens 180 is D8, the center thickness of the ninth lens 190 is D9, the center thickness of the tenth lens 200 is D10, the center thickness of the eleventh lens 210 is D11, and the center thickness of the twelfth lens 220 is D12; an air gap distance between the first lens 110 and the second lens 120 is C1, an air gap distance between the second lens 120 and the third lens 130 is C2, an air gap distance between the third lens 130 and the fourth lens 140 is C3, an air gap distance between the fifth lens 150 and the sixth lens 160 is C4, an air gap distance between the sixth lens 160 and the stop 300 is C5, an air gap distance between the stop 300 and the seventh lens 170 is C6, an air gap distance between the eighth lens 180 and the ninth lens 190 is C7, and an air gap distance between the tenth lens 200 and the eleventh lens 210 is C8;
Wherein D1 is more than or equal to 8mm and less than or equal to 15mm, D2 is more than or equal to 13mm and less than or equal to 20mm, D3 is more than or equal to 3mm and less than or equal to 8mm, D4 is more than or equal to 15mm and less than or equal to 30mm, D5 is more than or equal to 1mm and less than or equal to 3mm, D6 is more than or equal to 2mm and less than or equal to 5mm, D7 is more than or equal to 8mm and less than or equal to 15mm, D8 is more than or equal to 8mm and less than or equal to 18mm, D9 is more than or equal to 1mm and less than or equal to 3mm, D10 is more than or equal to 8mm and less than or equal to 15mm, D11 is more than or equal to 10mm and less than or equal to 20mm, and D12 is more than or equal to 3 mm; c1 is more than or equal to 10mm and less than or equal to 20mm, C2 is more than or equal to 15mm and less than or equal to 30mm, C3 is more than or equal to 5mm and less than or equal to 15mm, C4 is more than or equal to 10mm and less than or equal to 20mm, C5 is more than or equal to 2mm and less than or equal to 3.5mm, C6 is more than or equal to 4mm and less than or equal to 6mm, C7 is more than or equal to 0.05mm and less than or equal to 0.3mm, and C8 is more than or equal to 0.1mm and less than or equal to 0.5 mm.
In this embodiment, through the air gap distance between the central thickness of reasonable setting each lens and the adjacent lens, when guaranteeing that the focal power and the focus of each lens satisfy focal power and focus requirement in above-mentioned embodiment, help reducing the distortion, improve the image quality, promote the resolution ratio of camera lens formation of image.
It is understood that, in the present embodiment, the fourth lens 140 and the fifth lens 150 constitute the first cemented lens group 21, the seventh lens 170 and the eighth lens 180 constitute the second cemented lens group 22, the ninth lens 190 and the tenth lens 200 constitute the third cemented lens group 23, and the eleventh lens 210 and the twelfth lens 220 constitute the fourth cemented lens group 24, at this time, the air gap distance between the fourth lens 140 and the fifth lens 150 is 0, the air gap distance between the seventh lens 170 and the eighth lens 180 is 0, the air gap distance between the ninth lens 190 and the tenth lens 200 is 0, and the air gap distance between the eleventh lens 210 and the twelfth lens 220 is 0.
Illustratively, table 1 details specific optical physical parameters of each lens in the optical lens provided in the embodiment of the present invention in a feasible implementation manner, and the optical lens in table 1 corresponds to the optical lens shown in fig. 1.
TABLE 1 design values of optical physical parameters of optical lens
The surface numbers are numbered according to the surface sequence of each lens, for example, surface number 1 represents the object side surface of the first lens 110, surface number 2 represents the image side surface of the first lens 110, and so on; the curvature radius represents the bending degree of the surface of the lens, a positive value represents that the surface is bent to the image surface side, and a negative value represents that the surface is bent to the object surface side; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm); the refractive index represents the deflection capability of a material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the K coefficient represents the magnitude of the best-fit conic coefficient for the aspheric surface.
The aspheric surface shape equation Z satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the fitting sphere, c is 1/R, and R represents the paraxial curvature radius of the mirror surface; k is a conic coefficient; a is 2、a4、a6、a8、a10、a12、a14High-order aspheric coefficients.
By way of example, table 2 details the aspheric coefficients of the lenses of the present embodiment in one possible implementation.
TABLE 2 design values of aspherical coefficients of respective lenses in optical lens
| Flour | a2 | a4 | a6 | a8 | a10 | a12 | a14 |
| 16 | 0 | -2.25E-05 | -1.74E-08 | -8.29E-11 | 4.06E-13 | -2.19E-15 | 3.43E-18 |
| 18 | 0 | -2.19E-05 | 4.28E-09 | -1.13E-11 | -5.51E-14 | 1.80E-16 | -2.66E-19 |
| 21 | 0 | 3.39E-07 | 2.20E-09 | -3.28E-12 | -1.33E-15 | 4.32E-18 | -2.15E-21 |
wherein-2.25E-05 represents a coefficient a having a face number of 164-2.25 x 10-5, and so on.
The optical lens provided by the embodiment achieves the following technical indexes:
focal length f: 25 plus or minus 0.5 mm;
aperture F #: 4.5;
field angle FOV: greater than 180 °;
the optical back focus is larger than 44 mm;
CRA：＜25°；
total length TTL: less than 220 mm;
maximum target surface: is more than 83 mm;
no obvious respiratory effect.
Optionally, fig. 2 is an MTF graph of an optical lens according to an embodiment of the present invention, where the MTF graph can represent the comprehensive imaging quality of a fixed-focus lens, and the higher the MTF value is, the clearer the imaging is, as shown in fig. 2, the transfer functions of the MTF curve at 100 line pairs/mm are basically all above 0.2, and the transfer functions of the MTF curve at 200 line pairs/mm can reach above 0.3, so as to meet the image quality requirements of 16K and above.
Fig. 3 is a dot-sequence diagram of an optical lens according to an embodiment of the present invention, wherein the dot-sequence diagram is one of the most common evaluation methods in modern optical design. The point diagram is that after many light rays emitted by a point light source pass through an optical system, intersection points of the light rays and an image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed. As shown in fig. 3, in the optical lens provided in the embodiment of the present invention, the diffusion patterns of the light beams with different wavelengths (0.4350 μm, 0.4861 μm, 0.5450 μm, 0.5876 μm, and 0.6563 μm) in each field are relatively concentrated and distributed uniformly, and the diffusion patterns in a certain field are not separated from each other up and down according to the wavelength. Meanwhile, the root mean square radius values (RMS radii) of light rays (0.4350 μm, 0.4861 μm, 0.5450 μm, 0.5876 μm and 0.6563 μm) with different wavelengths at each field position of the optical lens are respectively 1.336 μm, 2.468 μm, 3.006 μm, 3.572 μm and 5.063 μm, which shows that the RMS radii of each field are all less than 6 μm, namely that the optical lens has lower chromatic aberration and aberration, the resolution of the optical lens is more balanced from the center to the edge, and the 16K resolution is achieved from the center to the 0.7 field.
Fig. 4 is a vertical axis chromatic aberration diagram of an optical lens according to an embodiment of the present invention, as shown in fig. 4, a vertical direction represents a normalization of a field angle, 0 represents on an optical axis, and a vertex in the vertical direction represents a maximum field radius; the horizontal direction is the offset in units of micrometers (μm) with respect to a meridian range of 0.545 μm. The numbers on the curve in the figure represent the wavelength represented by the curve, and the unit micrometer (mum) is shown in figure 4, and the vertical axis chromatic aberration can be controlled within the range of (-8μm, 8μm), which shows that the chromatic aberration of each wave band of the lens is well corrected.
Fig. 5 is a field curvature distortion diagram of an optical lens according to an embodiment of the invention, as shown in fig. 5, in a left coordinate system, a horizontal coordinate represents a size of the field curvature, and the unit is millimeter; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 5, the optical lens provided by this embodiment is effectively controlled in curvature of field from 435nm to 656nm, i.e. when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 5, the distortion of the optical lens provided by the present embodiment is better corrected.
Meanwhile, because the optical lens is used, a projection mode is needed to restore the image, the distortion of the image at the edge of the lens needs to be restored and corrected, and the resolution at the edge is reduced, as shown in fig. 5, the optical lens provided by the embodiment of the invention achieves positive F-THERA distortion, and the F-THERA distortion is larger than 7.5%, so that the resolution at each degree of the edge is higher than that at the center, and after the edge effect is restored and corrected, the resolution is equivalent to that at the center, thereby improving the image quality and improving the imaging definition of the lens.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical lens is characterized in that,
the optical lens group comprises a front lens group, a movable lens group and a rear lens group which are sequentially arranged from an object side to an image side along an optical axis;
the front lens group and the rear lens group are fixedly arranged, and the movable lens group is movably arranged along the optical axis direction;
The front lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis;
the movable lens group comprises a sixth lens;
the focal length of the front lens group is f1, the focal length of the movable lens group is f2, and the focal length of the rear lens group is f3, wherein 1.5 < (f1 x f2)/f3 is less than 3;
the first lens has a negative optical power, the second lens has a negative optical power, and the third lens has a negative optical power;
the fourth lens and the fifth lens form a first cemented lens group, and the first cemented lens group has positive focal power;
the sixth lens has a positive optical power.
2. An optical lens according to claim 1,
-20mm≤f1≤-50mm，30mm≤f2≤55mm，-500mm≤f3≤800mm。
3. an optical lens according to claim 1,
the rear lens group comprises a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged from an object side to an image side along an optical axis;
the seventh lens and the eighth lens constitute a second cemented lens group, the ninth lens and the tenth lens constitute a third cemented lens group, and the eleventh lens and the twelfth lens constitute a fourth cemented lens group.
4. The optical lens according to claim 3,
the second cemented lens group has positive power, the third cemented lens group has negative power, and the fourth cemented lens group has positive power.
5. An optical lens according to claim 3,
the object side surface of the ninth lens element is aspheric, the image side surface of the tenth lens element is aspheric, and the image side surface of the twelfth lens element is aspheric.
6. An optical lens according to claim 3,
the third lens, the seventh lens, the tenth lens, and the eleventh lens are ED glass lenses.
7. An optical lens according to claim 3,
the refractive index of the first lens is N1, and the Abbe number is v 1; the refractive index of the second lens is N2, and the Abbe number is v 2; the refractive index of the third lens is N3, and the Abbe number is v 3; the refractive index of the fourth lens is N4, and the Abbe number is v 4; the refractive index of the fifth lens is N5, and the Abbe number is v 5; the refractive index of the sixth lens is N6, and the Abbe number is v 6; the refractive index of the seventh lens is N7, and the Abbe number is v 7; the refractive index of the eighth lens is N8, and the Abbe number is v 8; the refractive index of the ninth lens is N9, and the Abbe number is v 9; the refractive index of the tenth lens is N10, and the Abbe number is v 10; the refractive index of the eleventh lens is N11, and the Abbe number is v 11; the refractive index of the twelfth lens is N12, and the Abbe number is v 12;
Wherein N1 is more than 1.5 and less than 2.1, and v1 is more than 25 and less than 40; n2 is more than 1.5 and less than 2.1, v2 is more than 15 and less than 20;
1.5＜N3＜1.65，65＜v3＜70；1.5<N4＜2，25＜v4＜35；
1.85＜N5＜2.15，20＜v5＜25；1.65＜N6＜1.95，20＜v6＜25；
1.5＜N7＜1.65，65＜v7＜70；1.5＜N8＜1.7，50＜v8＜60；
1.85＜N9＜2.1，20＜v9＜27；1.5＜N10＜1.65，65＜v10＜70；
1.5＜N11＜1.65，65＜v11＜70；1.9＜N12＜2.1，22＜v12＜28。
8. an optical lens according to claim 3,
the first lens is a meniscus lens, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is a meniscus lens, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens is a biconvex lens; the fourth lens is a biconvex lens;
the fifth lens is a biconcave lens; the sixth lens is a biconvex lens;
the seventh lens is a meniscus lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;
the eighth lens is a meniscus lens, the object side of the eighth lens is a concave surface, and the image side of the eighth lens is a convex surface;
the object side surface of the ninth lens is a concave surface, and the image side surface of the ninth lens is a concave surface;
the object side surface of the tenth lens element is a convex surface, and the image side surface of the tenth lens element is a convex surface;
the eleventh lens is a biconvex lens;
the object side surface of the twelfth lens element is a concave surface, and the image side surface of the twelfth lens element is a convex surface.
9. An optical lens according to claim 3,
the optical lens further comprises a diaphragm;
The diaphragm is located in a light path between the movable mirror group and the rear mirror group.
10. The optical lens of claim 9,
the center thickness of the first lens is D1, the center thickness of the second lens is D2, the center thickness of the third lens is D3, the center thickness of the fourth lens is D4, the center thickness of the fifth lens is D5, the center thickness of the sixth lens is D6, the center thickness of the seventh lens is D7, the center thickness of the eighth lens is D8, the center thickness of the ninth lens is D9, the center thickness of the tenth lens is D10, the center thickness of the eleventh lens is D11, and the center thickness of the twelfth lens is D12; an air gap distance between the first lens and the second lens is C1, an air gap distance between the second lens and the third lens is C2, an air gap distance between the third lens and the fourth lens is C3, an air gap distance between the fifth lens and the sixth lens is C4, an air gap distance between the sixth lens and the stop is C5, an air gap distance between the stop and the seventh lens is C6, an air gap distance between the eighth lens and the ninth lens is C7, and an air gap distance between the tenth lens and the eleventh lens is C8;
Wherein D1 is more than or equal to 8mm and less than or equal to 15mm, D2 is more than or equal to 13mm and less than or equal to 20mm, D3 is more than or equal to 3mm and less than or equal to 8mm,
15mm≤D4≤30mm，1mm≤D5≤3mm，2mm≤D6≤5mm，8mm≤D7≤15mm，8mm≤D8≤18mm，1mm≤D9≤3mm，8mm≤D10≤15mm，10mm≤D11≤20mm，1mm≤D12≤3mm；
10mm≤C1≤20mm，15mm≤C2≤30mm，5mm≤C3≤15mm，10mm≤C4≤20mm，2mm≤C5≤3.5mm，4mm≤C6≤6mm，0.05mm≤C7≤0.3mm，0.1mm≤C8≤0.5mm。
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