CN105676422A - Photographic optical system - Google Patents
Photographic optical system Download PDFInfo
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- CN105676422A CN105676422A CN201510991011.5A CN201510991011A CN105676422A CN 105676422 A CN105676422 A CN 105676422A CN 201510991011 A CN201510991011 A CN 201510991011A CN 105676422 A CN105676422 A CN 105676422A
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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
Abstract
The invention provides a photographic optical system. The photographic optical system sequentially comprises a first lens (focal length being f1), a second lens (focal length being f2), a third lens (focal length being f3), a fourth lens (focal length being f4), a fifth lens (focal length being f5), a sixth lens (focal length being f6) and a seventh lens (focal length being f7) which are coaxially arranged from an object side to an image side, wherein the first lens has negative focal power and an object side surface being a convex surface; and the seventh lens has negative focal power, and satisfies the following conditions: -1.5<f1/f<-0.5, 1.0<f2/f<2.5, 0.5<f3/f<1.5 , -2.5<f4/f<-0.5, -10<f5/f<-2, 0.2<f6/f<1.2, -2.5<f7/f<-0.4, wherein f is the focal length of the entire system. The photographic optical system with large relative aperture provided by the invention is designed through reasonable surface form optimization, focal power allocation and optical material selection, can provide imaging performance in a low illumination environment, and is clear in imaging.
Description
[technical field]
The present invention relates to photographic optical system, be specifically related to a kind of photographic optical system for portable electric appts.
[background technology]
In recent years, flourish along with miniaturization photographic lens, the demand of minisize image acquisition module day by day improves, and generally the photo-sensitive cell of photographic lens is nothing more than being photosensitive coupling element or complementary metal oxide conductor element two kinds, and progressing greatly along with semiconductor fabrication process technology, the Pixel Dimensions making photo-sensitive cell reduces, add electronic product now with the good and compact external form of function for development trend, therefore, the miniaturization photographic lens possessing good image quality becomes main flow in the market.
In the photographic lens of use sense optical element, the resolution of image is just gradually increased, and the size of pixel is being gradually reduced. Therefore, corresponding camera lens is accomplished by meeting has the requirement such as high-resolution and excellent optical property, for instance realizes the wide angle of camera lens, improves the sensitivity of camera lens, and reduce the sensitivity etc. of camera lens. The photographic lens of existing seven mirror groups, architectural limitation, it is impossible to correct main rank aberration further, for instance spherical aberration, cause that imaging performance is limited.
[summary of the invention]
For solving above-mentioned technical problem, the present invention provides a kind of new optical system structure form, reasonably optimizing face type, distribution focal power, selection optical material, devises the photographic optical system of the seven mirror groups of tool suitable in mancarried electronic aid and blur-free imaging.
The present invention provides a kind of photographic optical system, it is followed successively by from thing side to image side and is coaxially disposed the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens, described first lens have a negative power and thing side is convex surface, described 7th lens have negative power, and satisfy the following conditional expression (1)～(7):
-1.5 f1/f-0.5 ... (1)
1.0 f2/f 2.5 ... (2)
0.5 f3/f 1.5 ... (3)
-2.5 f4/f-0.5 ... (4)
-10 f5/f-2 ... (5)
0.2 f6/f 1.2 ... (6)
-2.5 f7/f-0.4 ... (7)
Wherein, the focal length of the f1: the first lens, the focal length of the f2: the second lens, the focal length of the f3: the three lens, the focal length of the f4: the four lens, the focal length of the f5: the five lens, the focal length of the f6: the six lens, the focal length of the f7: the seven lens, f: the focal length of whole camera system.
In photographic optical system one provided by the invention preferred embodiment, described photographic optical system also meets with conditional:
-5mm f1-1mm, 1.50 n1 1.55,40 v1 60;
2mm f2 6mm, 1.50 n2 1.55,40 v2 60;
2mm f3 5mm, 1.50 n3 1.55,40 v3 60;
-10mm f4-2mm, 1.60 n4 1.70,15 v4 30;
-30mm f5-10mm, 1.60 n5 1.70,15 v5 30;
1mm f6 5mm, 1.50 n6 1.55,40 v6 60;
-5mm f7-2mm, 1.50 n7 1.55,40 v7 60;
Wherein,
The focal length of the f1: the first lens, the refractive index of the n1: the first lens, the Abbe number of the v1: the first lens;
The focal length of the f2: the second lens, the refractive index of the n2: the second lens, the Abbe number of the v2: the second lens;
The focal length of the f3: the three lens, the refractive index of the n3: the three lens, the Abbe number of the v3: the three lens;
The focal length of the f4: the four lens, the refractive index of the n4: the four lens, the Abbe number of the v4: the four lens;
The focal length of the f5: the five lens, the refractive index of the n5: the five lens, the Abbe number of the v5: the five lens;
The focal length of the f6: the six lens, the refractive index of the n6: the six lens, the Abbe number of the v6: the six lens;
The focal length of the f7: the seven lens, the refractive index of the n7: the seven lens, the Abbe number of the v7: the seven lens.
In photographic optical system one provided by the invention preferred embodiment, described first lens and described second lens are approximately without focal power mirror group, it is possible to rationally correct spherical aberration, and will not introduce aberration and the curvature of field. Satisfy the following conditional expression:
F1-2>60mm or f1-2<-50mm;
Wherein, the combined focal length of the f1-2: the first lens and the second lens.
In photographic optical system one provided by the invention preferred embodiment, the focal length of described photographic optical system and the ratio of system optics overall length, satisfy the following conditional expression:
f/TTL>0.65
Wherein, TTL: from the thing side of described first lens to the distance of imaging surface.
In photographic optical system one provided by the invention preferred embodiment, described 4th lens and the 5th lens adopt high index of refraction, low Abbe number material, can rationally correct system aberration, 4th lens meet relational expression 1.60 n4 1.70,15 v4 30,5th lens meet relational expression 1.60 n5 1.70,15 v5 30.
In photographic optical system one provided by the invention preferred embodiment, described 7th lens are minus lens, it is possible to effectively reduce the system curvature of field. Described 7th lens satisfy condition formula-5mm f7-2mm.
In photographic optical system one provided by the invention preferred embodiment, described image pickup optical system also satisfies the following conditional expression:
TTL 5.4mm;
78 °F of OV 88 °;
Wherein, TTL: the thing side of described first lens is to the distance of image planes;
FOV: the maximum angular field of view that described image pickup optical system photographs.
In photographic optical system one provided by the invention preferred embodiment, the thing side of described 4th lens, the image side surface of described 5th lens and the thing side of described 7th lens are respectively provided with a point of inflexion, and the image side surface of described 3rd lens, the image side surface of described 6th lens and the image side surface of described 7th lens are respectively provided with two points of inflexion.
In photographic optical system one provided by the invention preferred embodiment, the image side surface of described 3rd lens has two dwell point, the thing side of described 4th lens, the thing side of described 7th lens and image side surface thereof and is respectively provided with a dwell point.
In photographic optical system one provided by the invention preferred embodiment, the thing side of described first lens and image side surface are sphere or aspheric surface.
In photographic optical system one provided by the invention preferred embodiment, described first lens, described second lens, described 3rd lens, described 4th lens, described 5th lens, described 6th lens and described 7th lens are plastic lens.
Compared to correlation technique, photographic optical system provided by the invention has the advantages that
The present invention, by reasonably optimizing face type, distribution focal power, selection optical material, devises object lens of large relative aperture photographic optical system, it is possible to realize imaging clearly under low-light (level) environment; The combination focal power of described first lens and described second battery of lens is approximately without focal power mirror group, it is possible to rationally corrects spherical aberration, and will not introduce aberration and the curvature of field; Described 4th lens and described 5th lens adopt the material of high index of refraction, low Abbe number, it is possible to effectively reduce system color poor; Described 7th lens are that negative-power lenses can effectively reduce the system curvature of field.
[accompanying drawing explanation]
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is the structural representation of a preferred embodiment of photographic optical system provided by the invention;
Fig. 2 is the MTF curve figure of photographic optical system shown in Fig. 1;
Fig. 3 is the curvature of field curve chart of photographic optical system shown in Fig. 1;
Fig. 4 is the distortion curve figure of photographic optical system shown in Fig. 1.
[detailed description of the invention]
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Refer to Fig. 1, be the structural representation of a preferred embodiment of photographic optical system provided by the invention. Described photographic optical system 1 is mainly made up of seven lens being coaxially disposed, comprise the first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens 160 and the 7th lens 170 successively from thing side to image side, its concrete structure is as follows:
Described first lens 110 have negative power, and its thing side 112 is convex surface and image side surface 114 is concave surface, is made up of plastic cement material, and the thing side 112 of described first lens 110 and image side surface 114 can be sphere or aspheric surface;
The thing side 122 of described second lens 120 is convex surface and image side surface 124 is concave surface, is made up of plastic cement material, and thing side 122 and the image side surface 124 of described second lens 120 are even aspheric surface;
The thing side 132 of described 3rd lens 130 is convex surface and image side surface 134 is convex surface, it is made up of plastic cement material, thing side 132 and the image side surface 134 of described 3rd lens 130 are even aspheric surface, and the image side surface of described 3rd lens is provided with two points of inflexion and two dwell point;
The thing side 142 of described 4th lens 140 is convex surface and image side surface 144 is concave surface, it is made up of plastic cement material, thing side 142 and the image side surface 144 of described 4th lens 140 are even aspheric surface, and the thing side of described 4th lens is provided with a point of inflexion and a dwell point;
The thing side 152 of described 5th lens 150 is concave surface and image side surface 154 is convex surface, is made up of plastic cement material, and thing side 152 and the image side surface 154 of described 5th lens 150 are even aspheric surface, and the image side surface of described 5th lens is provided with a point of inflexion;
The thing side 162 of described 6th lens 160 is concave surface and image side surface 164 is convex surface, is made up of plastic cement material, and thing side 162 and the image side surface 164 of described 6th lens 160 are even aspheric surface, and the image side surface of described 6th lens is provided with two points of inflexion;
The thing side 172 of described 7th lens 170 is changed into convex surface by dipped beam axle to periphery by concave surface for concave surface and image side surface 174, it is made up of plastic cement material, thing side 172 and the image side surface 174 of described 7th lens 170 are even aspheric surface, and the thing side 172 of described 7th lens 170 is respectively arranged with a point of inflexion and a dwell point, the image side surface 174 of described 7th lens 170 is provided with two points of inflexion and a dwell point.
Wherein, thing side is convex surface, refers to that thing side is formed as convex shape towards object; Thing side is concave surface, refers to that thing side forms the shape of depression towards object; Image side surface is convex surface, refers to that image side surface forms convex shape towards image planes; Image side is concave surface, refers to that image side surface forms the shape of depression towards image planes.
The focal power of described first lens 110 and described second lens 120 combination is approximately without focal power, it is possible to rationally corrects spherical aberration, and will not introduce aberration and the curvature of field. Described 4th lens 140 and described 5th lens 150 adopt the optical material of high index of refraction, low Abbe number, it is possible to effectively reduce system aberration. And described 7th lens 170 are negative-power lenses, it is possible to effectively reduce the system curvature of field. By the face type of seven lens of reasonably optimizing, distribute focal power, select optical material so that described photographic optical system 1 can have good imaging performance under low-light (level).
Described photographic optical system 1 also includes aperture 100 and glass plate 180, and described aperture 100 is located between described second lens 120 and the 3rd lens 130, is used for controlling light-inletting quantity and controlling the depth of field. The side, image side surface 174 place of described 7th lens 170 is located at by described glass plate 180, and described glass can be filter lens from flat board 180, and it has the effect filtering light, and its type can select according to the needs of practical situation. The image planes 190 i.e. face of image objects, is positioned at the described glass plate 180 side away from described 7th lens 170.
In photographic optical system 1 provided by the invention, in order to realize the designing requirement of the miniaturization of described photographic optical system 1, high sensitivity, high optical property and Wide-angle, first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens 160 of described photographic optical system 100 and the 7th lens 170 need to meet following condition:
One, focal length:
Under the unitary construction of described photographic optical system 1, first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens 160 of described photographic optical system 1 and the focal length of the 7th lens 170 need to meet following condition:
-5mm f1-1mm, 2mm f2 6mm, 2mm f3 5mm ,-10mm f4-2mm ,-30mm f5-10mm, 1mm f6 5mm ,-5mm f7-2mm;
-1.5 f1/f-0.5,1.0 f2/f 2.5,0.5 f3/f 1.5,
-2.5 f4/f-0.5 ,-10 f5/f-2,0.2 f6/f 1.2,
-2.5 f7/f-0.4;
Wherein, the focal length of the f1: the first lens, the focal length of the f2: the second lens, the focal length of the f3: the three lens, the focal length of the f4: the four lens, the focal length of the f5: the five lens, the focal length of the f6: the six lens,
The focal length of the f7: the seven lens, f: the focal length of whole photographic optical system.
Two, refractive index
Under the unitary construction of described photographic optical system 1, first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens 160 of described photographic optical system 1 and the refractive index of the 7th lens 170 need to satisfy condition:
1.50 < n1 < 1.55,1.50 n2 1.551.50 n3 1.55,
1.60 n4 1.70,1.60 n5 1.70,1.50 n6 1.55,
1.50 n7 1.55;
Wherein,
The refractive index of the n1: the first lens, the refractive index of the n2: the second lens, the refractive index of the n3: the three lens, the refractive index of the n4: the four lens, the refractive index of the n5: the five lens, the refractive index of the n6: the six lens, the refractive index of the n7: the seven lens.
Three, Abbe number
Under the unitary construction of described photographic optical system 1, first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens 160 of described photographic optical system 1 and the Abbe number of the 7th lens 170 need to satisfy condition:
40 v1 60,40 v2 60,40 v3 60,15 v4 30,
15 v5 30,40 v6 60,40 v7 60,
Wherein
The Abbe number of the v1: the first lens, the Abbe number of the v2: the second lens, the Abbe number of the v3: the three lens, the Abbe number of the v4: the four lens, the Abbe number of the v5: the five lens, the Abbe number of the v6: the six lens, the Abbe number of the v7: the seven lens.
If described first lens 110, described second lens 120, described 3rd lens 130, described 4th lens 140, described 5th lens 150, described 6th lens 160 and the focal length of described 7th lens 170, refractive index and Abbe number exceed above-mentioned condition, then the color aberration characteristics of described photographic optical system 1 and telecentricity characteristic may deteriorate, and the sensitivity of described photographic optical system can be increased, it is difficult to miniaturization and the Wide-angle of described photographic optical system, and is unfavorable for that described photographic optical system 1 reduces cost.
In the present embodiment, first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens the 140, the 5th lens the 150, the 6th lens the 160, the 7th lens 170 of described photographic optical system 1 and the data of the focal length of glass plate 180, refractive index and Abbe number are as shown in table 1 below respectively:
Thing side and the seriality of image side surface, radius of curvature, SAG and the half bore SD data of the first lens 110 (P1) of described photographic optical system 1, the second lens 120 (P2), the 3rd lens 130 (P3), the 4th lens 140 (P4), the 5th lens 150 (P5), the 6th lens 160 (P6) and the 7th lens 170 (P7) are as shown in table 2:
Wherein
The radius of curvature of the thing side of the R11: the first lens P1;
The radius of curvature of the image side surface of the R12: the first lens P1;
The radius of curvature of the thing side of the R21: the second lens P2;
The radius of curvature of the image side surface of the R22: the second lens P2;
The radius of curvature of the thing side of the R31: the three lens P3;
The radius of curvature of the image side surface of the R32: the three lens P3;
The radius of curvature of the thing side of the R41: the four lens P4;
The radius of curvature of the image side surface of the R42: the four lens P4;
The radius of curvature of the thing side of the R51: the five lens P5;
The radius of curvature of the image side surface of the R52: the five lens P5;
The radius of curvature of the thing side of the R61: the six lens P6;
The radius of curvature of the image side surface of the R62: the six lens P6;
The radius of curvature of the thing side of the R71: the seven lens P7;
The radius of curvature of the image side surface of the R72: the seven lens P7;
The lens surface of SAG11 the first lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG12 the first lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG21 the second lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG22 the second lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG31 the 3rd lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG32 the 3rd lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG41 the 4th lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG42 the 4th lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG51 the 5th lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG52 the 5th lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG61 the 6th lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG62 the 6th lens is projected on the optical axis position distance to the lens centre of this image side surface;
The lens surface of SAG71 the 7th lens is projected on the optical axis position distance to the lens centre of this thing side;
The lens surface of SAG72 the 7th lens is projected on the optical axis position distance to the lens centre of this image side surface.
The thickness of the first lens 110 (P1) of described photographic optical system 1, the second lens 120 (P2), aperture 100 (ST), the 3rd lens 130 (P3), the 4th lens 140 (P4), the 5th lens 150 (P5), the 6th lens 160 (P6), the 7th lens 170 (P7) and glass plate 180 (Tg) is as shown in table 3:
Wherein,
The thickness of the T1: the first lens;
The image side surface of the T12: the first lens and the thing side of the second lens spacing distance on optical axis;
The thickness of the T2: the second lens;
The image side surface of the ST: the second lens and aperture spacing distance on optical axis;
T23: the thing side of diaphragm face and the 3rd lens spacing distance on optical axis;
The thickness of the T3: the three lens;
The image side surface of the T34: the three lens and the thing side of the 4th lens spacing distance on optical axis;
The thickness of the T4: the four lens;
The image side of the T45: the four lens and the 5th lens spacing distance on optical axis;
The thickness of the T5: the five lens;
T56: the five lens and the 6th lens spacing distance on optical axis;
The thickness of the T6: the six lens;
T67: the six lens and the 7th lens spacing distance on optical axis;
The thickness of the T7: the seven lens.
In the present embodiment, DFOV=78.93 degree, HFOV=66.88 degree, VFOV=52.59 degree, wherein FOV is defined as the maximum angular field of view of described photographic optical system, and HFOV is defined as horizontal field of view angle, DFOV is defined as the diagonal angle of visual field, and VFOV is defined as vertical field of view angle.
Please refer to Fig. 2, Fig. 3 and Fig. 4, wherein Fig. 2 is MTF curve figure, Fig. 3 of photographic optical system shown in Fig. 1 is the curvature of field curve chart of photographic optical system shown in Fig. 1, and Fig. 4 is the distortion curve figure of photographic optical system shown in Fig. 1.Shown in as shown in Figure 2, Figure 3 and Figure 4, described photographic optical system 1 provided by the invention has higher optical property.
It addition, in photographic optical system 1 provided by the invention, described photographic optical system 1 is designed based on the optical system of object lens of large relative aperture, its optics overall length is less than 5.2mm, and the angle of visual field is between 78 degree to 80 degree.
Photographic optical system 1 provided by the invention has the advantages that
The present invention, by reasonably optimizing face type, distribution focal power, selection optical material, devises object lens of large relative aperture photographic optical system, using the teaching of the invention it is possible to provide the imaging performance under low-light (level) environment, imaging clearly; The combination focal power of described first lens 110 and described second lens 120 is approximately without focal power mirror group, it is possible to rationally corrects spherical aberration, and will not introduce aberration and the curvature of field; Described 4th lens 140 and described 5th lens 150 adopt the material of high index of refraction, low Abbe number, it is possible to effectively reduce system color poor; Described 7th lens 170 can effectively reduce the system curvature of field for negative-power lenses.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (11)
1. a photographic optical system, it is characterized in that, it is followed successively by from thing side to image side: be coaxially disposed the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens, described first lens have a negative power and thing side is convex surface, described 7th lens have negative power, and satisfy the following conditional expression (1)～(7):
-1.5 f1/f-0.5 ... (1)
1.0 f2/f 2.5 ... (2)
0.5 f3/f 1.5 ... (3)
-2.5 f4/f-0.5 ... (4)
-10 f5/f-2 ... (5)
0.2 f6/f 1.2 ... (6)
-2.5 f7/f-0.4 ... (7)
Wherein, the focal length of the f1: the first lens, the focal length of the f2: the second lens, the focal length of the f3: the three lens, the focal length of the f4: the four lens, the focal length of the f5: the five lens, the focal length of the f6: the six lens, the focal length of the f7: the seven lens, f: the focal length of whole described photographic optical system.
2. photographic optical system according to claim 1, it is characterised in that described photographic optical system also meets with conditional:
-5mm f1-1mm, 1.50 n1 1.55,40 v1 60;
2mm f2 6mm, 1.50 n2 1.55,40 v2 60;
2mm f3 5mm, 1.50 n3 1.55,40 v3 60;
-10mm f4-2mm, 1.60 n4 1.70,15 v4 30;
-30mm f5-10mm, 1.60 n5 1.70,15 v5 30;
1mm f6 5mm, 1.50 n6 1.55,40 v6 60;
-5mm f7-2mm, 1.50 n7 1.55,40 v7 60;
Wherein,
The focal length of the f1: the first lens, the refractive index of the n1: the first lens, the Abbe number of the v1: the first lens;
The focal length of the f2: the second lens, the refractive index of the n2: the second lens, the Abbe number of the v2: the second lens;
The focal length of the f3: the three lens, the refractive index of the n3: the three lens, the Abbe number of the v3: the three lens;
The focal length of the f4: the four lens, the refractive index of the n4: the four lens, the Abbe number of the v4: the four lens;
The focal length of the f5: the five lens, the refractive index of the n5: the five lens, the Abbe number of the v5: the five lens;
The focal length of the f6: the six lens, the refractive index of the n6: the six lens, the Abbe number of the v6: the six lens;
The focal length of the f7: the seven lens, the refractive index of the n7: the seven lens, the Abbe number of the v7: the seven lens.
3. photographic optical system according to claim 2, it is characterised in that described first lens and described second lens are approximately without focal power mirror group, it is possible to rationally correct spherical aberration, and will not introduce aberration and the curvature of field, satisfy the following conditional expression:
F1-2>60mm or f1-2<-50mm;
Wherein, the combined focal length of the f1-2: the first lens and the second lens.
4. photographic optical system according to claim 1, it is characterised in that the focal length of described photographic optical system and the ratio of system optics overall length, satisfies the following conditional expression:
f/TTL>0.65
Wherein, TTL: from the thing side of described first lens to the distance of imaging surface.
5. photographic optical system according to claim 1, it is characterized in that, described 4th lens and the 5th lens adopt high index of refraction, low Abbe number material, can rationally correct system aberration, 4th lens meet relational expression 1.60 n4 1.70,15 v4 30, the 5th lens meet relational expression 1.60 n5 1.70,15 v5 30.
6. photographic optical system according to claim 1, it is characterised in that described 7th lens are minus lens, it is possible to effectively reducing the system curvature of field, described 7th lens satisfy condition formula-5mm f7-2mm.
7. photographic optical system according to claim 2, it is characterised in that described photographic optical system also satisfies the following conditional expression:
TTL 5.4mm;
78 °F of OV 88 °;
Wherein, TTL: the thing side of described first lens is to the distance of image planes; FOV: the maximum angular field of view that described photographic optical system photographs.
8. photographic optical system according to claim 5, it is characterized in that, the thing side of described 4th lens, the image side surface of described 5th lens and the thing side of described 7th lens are respectively provided with a point of inflexion, and the image side surface of described 3rd lens, the image side surface of described 6th lens and the image side surface of described 7th lens are respectively provided with two points of inflexion.
9. photographic optical system according to claim 6, it is characterised in that the image side surface of described 3rd lens has two dwell point, the thing side of described 4th lens, the thing side of described 7th lens and image side surface thereof and is respectively provided with a dwell point.
10. photographic optical system according to claim 1, it is characterised in that the thing side of described first lens and image side surface are sphere or aspheric surface.
11. photographic optical system according to claim 1, it is characterised in that described first lens, described second lens, described 3rd lens, described 4th lens, described 5th lens, described 6th lens and described 7th lens are plastic lens.
Priority Applications (3)
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| CN201510991011.5A CN105676422B (en) | 2015-12-24 | 2015-12-24 | Photographic optical system |
| JP2016144827A JP2017116913A (en) | 2015-12-24 | 2016-07-22 | Image capturing optical system |
| US15/354,087 US9874724B2 (en) | 2015-12-24 | 2016-11-17 | Photographic optical system |
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| CN201510991011.5A CN105676422B (en) | 2015-12-24 | 2015-12-24 | Photographic optical system |
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Address after: 215000 133 Weixin Road, Suzhou Industrial Park, Suzhou, Jiangsu Patentee after: Rui Sheng Optoelectronic Technology (Suzhou) Co., Ltd. Address before: 215000 133 Weixin Road, Suzhou Industrial Park, Suzhou, Jiangsu Patentee before: AAC Acoustic Technologies (Suzhou) Co., Ltd. |
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Address after: 215000, No. 133, Xin Lu, Suzhou Industrial Park, Suzhou, Jiangsu Patentee after: Chengrui optics (Suzhou) Co., Ltd Address before: 215000, No. 133, Xin Lu, Suzhou Industrial Park, Suzhou, Jiangsu Patentee before: Ruisheng Optoelectronic Technology (Suzhou) Co.,Ltd. |