WO2020134372A1 - 摄像光学镜头 - Google Patents
摄像光学镜头 Download PDFInfo
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- WO2020134372A1 WO2020134372A1 PCT/CN2019/111160 CN2019111160W WO2020134372A1 WO 2020134372 A1 WO2020134372 A1 WO 2020134372A1 CN 2019111160 W CN2019111160 W CN 2019111160W WO 2020134372 A1 WO2020134372 A1 WO 2020134372A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
Definitions
- the invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging devices such as monitors and PC lenses.
- the photosensitive device of general photographic lenses is nothing more than a photosensitive coupling device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor device (Complementary Metal) -Oxide Semicondctor Sensor, CMOS Sensor), and due to the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced.
- CCD Charge Coupled Device
- CMOS Sensor complementary metal oxide semiconductor device
- today's electronic products have a trend of good function, thin and thin appearance, so they have good
- the imaging quality of the miniaturized camera lens has become the mainstream on the market.
- the lenses used in traditional mobile phone cameras mostly adopt three-piece, four-piece or even five-piece lens structures.
- the six-piece lens structure gradually appears in the lens design, common Although the six-piece lens has good optical performance, its optical power, lens spacing and lens shape settings still have certain irrationality, resulting in a lens structure with good optical performance, which cannot meet wide-angle and Ultra-thin design requirements.
- an object of the present invention is to provide an imaging optical lens that can meet the design requirements of wide-angle and ultra-thin while having good optical performance.
- the present invention provides an imaging optical lens, which includes, in order from the object side to the image side, an aperture, a first lens with positive refractive power, and a negative refractive power
- the second lens a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power;
- the focal length of the overall imaging optical lens is f
- the focal length of the second lens is f2
- the focal length of the fourth lens is f4
- the radius of curvature of the object side of the second lens is R3
- the image side of the second lens The radius of curvature is R4
- the radius of curvature of the object side of the fourth lens is R7
- the radius of curvature of the image side of the fourth lens is R8, which satisfies the following relationship:
- the present invention stipulates the ratio of the focal length of the second lens to the focal length of the overall imaging optical lens, stipulates the ratio of the focal length of the second lens to the focal length of the fourth lens, rationally distributes the optical power of the lens, and The shapes of the second lens and the fourth lens are specified.
- the imaging optical lens has good optical performance and meets the design requirements of wide-angle and ultra-thin.
- the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.10 ⁇ d5/TTL ⁇ 0.20.
- the on-axis thickness of the first lens is d1
- the on-axis distance of the image side of the first lens to the object side of the second lens is d2, satisfying the following relationship: 7.00 ⁇ d1/d2 ⁇ 10.00.
- the radius of curvature of the object side of the sixth lens is R11
- the radius of curvature of the image side of the sixth lens is R12, satisfying the following relationship: 0.20 ⁇ (R11+R12)/(R11-R12) ⁇ 0.80.
- FIG. 1 is a schematic structural view of a first embodiment of the imaging optical lens of the present invention
- FIG. 2 is a schematic diagram of the axial aberration of the imaging optical lens shown in FIG. 1;
- FIG. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;
- FIG. 4 is a schematic diagram of astigmatic field curvature and distortion of the imaging optical lens shown in FIG. 1;
- FIG. 5 is a schematic structural view of a second embodiment of the imaging optical lens of the present invention.
- FIG. 6 is a schematic diagram of the axial aberration of the imaging optical lens shown in FIG. 5;
- FIG. 7 is a schematic diagram of magnification chromatic aberration of the imaging optical lens shown in FIG. 5;
- FIG. 8 is a schematic diagram of astigmatic field curvature and distortion of the imaging optical lens shown in FIG. 5;
- FIG. 9 is a schematic structural view of a third embodiment of the imaging optical lens of the present invention.
- FIG. 10 is a schematic diagram of the axial aberration of the imaging optical lens shown in FIG. 9;
- FIG. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;
- FIG. 12 is a schematic diagram of astigmatic field curvature and distortion of the imaging optical lens shown in FIG. 9.
- FIG. 13 is a schematic structural view of a fourth embodiment of the imaging optical lens of the present invention.
- FIG. 14 is a schematic diagram of the axial aberration of the imaging optical lens shown in FIG. 13;
- FIG. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 13;
- FIG. 16 is a schematic diagram of astigmatic field curvature and distortion of the imaging optical lens shown in FIG. 13.
- FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
- the imaging optical lens 10 includes six lenses.
- the imaging optical lens 10 includes, in order from the object side to the image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth Lens L6.
- an optical element such as a glass flat plate GF is provided between the sixth lens L6 and the image plane Si.
- the glass flat plate GF may be a glass cover plate or an optical filter. Of course, In other possible implementation manners, the glass plate GF may also be disposed at other positions.
- the first lens L1 has a positive refractive power, and its object side surface is convex outward, and its image side is concave;
- the second lens L2 has a negative refractive power, its object side surface is convex, and its image side is concave ;
- the third lens L3 has a positive refractive power, its object side is concave, and its image side is convex;
- the fourth lens L4 has a negative refractive power, its object side is concave, and its image side is convex;
- the fifth lens L5 has a positive refractive power The object side is convex and the image side is convex;
- the sixth lens L6 has a negative refractive power, the object side is concave, and the image side is concave.
- the focal length of the overall imaging optical lens 10 is defined as f
- the focal length of the second lens is f2
- the focal length of the fourth lens is f4
- the radius of curvature of the object side surface of the second lens is R3
- the first The radius of curvature of the image side of the two lenses is R4
- the radius of curvature of the object side of the fourth lens is R7
- the radius of curvature of the image side of the fourth lens is R8, which satisfies the following relationship:
- conditional expression (1) specifies the ratio of the focal length of the second lens L2 to the focal length of the overall imaging optical lens 10, and within this range of conditions, the spherical aberration generated by the first lens and the field curvature of the system can be effectively balanced.
- Conditional expression (2) specifies the ratio of the focal length of the second lens L2 and the focal length of the fourth lens L4. Through the reasonable distribution of focal length, the system has better imaging quality and lower sensitivity.
- Conditional expression (3) specifies the shape of the second lens L2, and within this range of conditions, it is advantageous to correct chromatic aberration on the axis.
- Conditional expression (4) specifies the shape of the fourth lens L4. Outside this range of conditions, with the development of ultra-thin wide angle, it is difficult to correct the aberration of the off-axis angle.
- the above-mentioned lens arrangement method enables the imaging optical lens to have good optical performance while meeting the design requirements of wide-angle and ultra-thin.
- the axial thickness of the third lens is d5
- the total optical length of the imaging optical lens is TTL, which satisfies the following relationship:
- Conditional expression (5) specifies the ratio of the axial thickness d5 of the third lens L3 to the total lens optical length TTL. Within this range of conditions, it is beneficial to improve the system image quality in the case of ultra-thinness.
- the axial thickness of the first lens is d1
- the axial distance between the image side of the first lens and the object side of the second lens is d2, which satisfies the following relationship:
- Conditional expression (6) specifies the ratio of the axial thickness of the first lens L1 to the axial distance of the image side of the first lens L1 to the object side of the second lens L2, which helps to compress the total length of the optical system within the range of the conditional expression , To achieve ultra-thin effect.
- the radius of curvature of the object side of the sixth lens is R11
- the radius of curvature of the image side of the sixth lens is R12, which satisfies the following relationship:
- Conditional expression (7) specifies the shape of the sixth lens L6, and within this condition range, it is advantageous to correct the aberration of the off-axis picture angle.
- the surface of the lens can be set as an aspheric surface, and the aspheric surface can be easily made into a shape other than a spherical surface, and more control variables are obtained to reduce aberrations, thereby reducing the number of lenses used, so the imaging optics of the present invention can be effectively reduced
- the total length of the lens In the embodiment of the present invention, the object side and the image side of each lens are aspherical.
- the imaging optical lens 10 can reasonably allocate the power, surface type, and axial thickness of each lens, etc., and thus correct various types of aberrations.
- the imaging optical lens 10 The total optical length of TTL, the image height IH of the imaging optical lens 10, satisfies the following relationship: TTL/IH ⁇ 1.47; the FOV of the imaging optical lens 10, satisfies the following relationship: FOV ⁇ 78 degrees. It realizes the design requirements of wide-angle and ultra-thin while having good optical imaging performance.
- the object side and/or image side of the lens may also be provided with a reflex point and/or a stagnation point to meet the high-quality imaging requirements.
- a reflex point and/or a stagnation point may also be provided with a stagnation point to meet the high-quality imaging requirements.
- the following shows the design data of the imaging optical lens 10 in the first embodiment of the present invention. It should be noted that in this embodiment, the unit of distance, radius, and center thickness is millimeters (mm).
- Table 1 and Table 2 show the design data of the imaging optical lens 10 according to the first embodiment of the present invention.
- R the radius of curvature of the optical surface and the center radius of curvature when the lens is used
- R1 radius of curvature of the object side of the first lens L1;
- R2 radius of curvature of the image side of the first lens L1;
- R3 radius of curvature of the object side of the second lens L2;
- R4 radius of curvature of the image side of the second lens L2;
- R5 radius of curvature of the object side of the third lens L3;
- R6 radius of curvature of the image side of the third lens L3;
- R7 radius of curvature of the object side of the fourth lens L4;
- R8 radius of curvature of the image side of the fourth lens L4;
- R9 radius of curvature of the object side of the fifth lens L5;
- R10 radius of curvature of the image side of the fifth lens L5;
- R11 radius of curvature of the object side of the sixth lens L6;
- R12 radius of curvature of the image side of the sixth lens L6;
- R13 radius of curvature of the object side of the optical filter GF
- R14 Radius of curvature of the image side of the optical filter GF
- d2 the axial distance between the image side of the first lens L1 and the object side of the second lens L2;
- d4 the axial distance between the image side of the second lens L2 and the object side of the third lens L3;
- d6 the axial distance between the image side of the third lens L3 and the object side of the fourth lens L4;
- d10 on-axis distance from the image side of the fifth lens L5 to the object side of the sixth lens L6;
- d12 the axial distance between the image side of the sixth lens L6 and the object side of the optical filter GF;
- d14 the axial distance from the image side of the optical filter GF to the image plane
- nd refractive index of d-line
- nd1 refractive index of the d-line of the first lens L1;
- nd2 refractive index of the d-line of the second lens L2;
- nd3 refractive index of the d-line of the third lens L3;
- nd4 refractive index of the d-line of the fourth lens L4;
- nd5 refractive index of the d-line of the fifth lens L5;
- nd6 refractive index of the d-line of the sixth lens L6;
- ndg refractive index of the d-line of the optical filter GF
- vg Abbe number of optical filter GF.
- Table 2 shows aspherical data of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
- k is the conic coefficient
- A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspherical coefficients.
- the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (8).
- the present invention is not limited to the aspherical polynomial form represented by the formula (8).
- Tables 3 and 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
- P1R1, P1R2 represent the object side and the image side of the first lens L1
- P2R1, P2R2 represent the object side and the image side of the second lens L2
- P3R1, P3R2 represent the object side and the image side of the third lens L3,
- P4R1 and P4R2 respectively represent the object side and image side of the fourth lens L4
- P5R1 and P5R2 respectively represent the object side and image side of the fifth lens L5
- P6R1 and P6R2 respectively represent the object side and image side of the sixth lens L6.
- the corresponding data in the "Recurve Point Position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10.
- the corresponding data in the "stay point position” column is the vertical distance between the stagnation point set on the surface of each lens and the optical axis of the imaging optical lens 10.
- FIGS. 2 and 3 show schematic diagrams of axial aberration and magnification chromatic aberration of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm after passing through the imaging optical lens 10 of the first embodiment.
- FIG. 4 shows a schematic diagram of the field curvature and distortion of the light with a wavelength of 546 nm after passing through the imaging optical lens 10 of the first embodiment.
- the field curvature S of FIG. 4 is the field curvature in the sagittal direction
- T is the field in the meridional direction song.
- Table 17 shows the values corresponding to the parameters specified in the conditional expressions in each of Examples 1, 2, 3, and 4.
- the first embodiment satisfies each conditional expression.
- the entrance pupil diameter of the imaging optical lens is 2.742mm
- the full-field image height is 4.00mm
- the diagonal viewing angle is 78.84°. It has good optical performance and satisfies wide-angle And ultra-thin design requirements.
- the second embodiment is basically the same as the first embodiment, and the symbol meaning is the same as the first embodiment, and only the differences are listed below.
- Tables 5 and 6 show the design data of the imaging optical lens 20 according to the second embodiment of the present invention.
- Table 6 shows aspherical data of each lens in the imaging optical lens 20 of the second embodiment of the present invention.
- Tables 7 and 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 of the second embodiment of the present invention.
- FIG. 6 and 7 show schematic diagrams of axial aberration and chromatic aberration of magnification of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm after passing through the imaging optical lens 20 of the second embodiment.
- FIG. 8 shows a schematic diagram of field curvature and distortion after the light with a wavelength of 546 nm passes through the imaging optical lens 20 of the second embodiment.
- the second embodiment satisfies each conditional expression.
- the entrance pupil diameter of the imaging optical lens is 2.770mm
- the full-field image height is 4.00mm
- the diagonal field angle is 78.26°, which has good optical performance and satisfies wide-angle And ultra-thin design requirements.
- the third embodiment is basically the same as the first embodiment, and the symbol meaning is the same as the first embodiment, and only the differences are listed below.
- Table 9 and Table 10 show the design data of the imaging optical lens 30 according to the third embodiment of the present invention.
- Table 10 shows aspherical data of each lens in the imaging optical lens 30 of the third embodiment of the present invention.
- Table 11 and Table 12 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30 of the third embodiment of the present invention.
- FIG. 10 and 11 show schematic diagrams of axial aberration and chromatic aberration of magnification of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm after passing through the imaging optical lens 30 of the third embodiment.
- FIG. 12 shows a schematic diagram of field curvature and distortion after the light with a wavelength of 546 nm passes through the imaging optical lens 30 of the third embodiment.
- the third embodiment satisfies each conditional expression.
- the entrance pupil diameter of the imaging optical lens is 2.713mm
- the full-field image height is 4.00mm
- the diagonal viewing angle is 79.41°. It has good optical performance and meets wide-angle requirements And ultra-thin design requirements.
- the fourth embodiment is basically the same as the first embodiment, and the symbol meaning is the same as the first embodiment, and only the differences are listed below.
- Table 13 and Table 14 show the design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
- Table 14 shows aspherical data of each lens in the imaging optical lens 40 of the fourth embodiment of the present invention.
- Table 15 and Table 16 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 40 of the fourth embodiment of the present invention.
- FIGS. 14 and 15 show schematic diagrams of axial aberration and magnification chromatic aberration of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm after passing through the imaging optical lens 40 of the fourth embodiment.
- FIG. 16 shows a schematic diagram of field curvature and distortion after the light with a wavelength of 546 nm passes through the imaging optical lens 40 of the fourth embodiment.
- the fourth embodiment satisfies each conditional expression.
- the entrance pupil diameter of the imaging optical lens is 2.735 mm
- the full-field image height is 4.00 mm
- the diagonal viewing angle is 78.98°. It has good optical performance and meets wide-angle requirements And ultra-thin design requirements.
- Example 1 Example 2
- Example 3 Example 4 Remarks f2/f -8.32 -8.95 -6.02 -8.90 Conditional (1) f2/f4 11.71 12.90 9.06 11.08 Conditional (2) (R3+R4)/(R3-R4) 11.24 11.10 12.16 19.89 Conditional (3) R7/R8 0.03 0.02 0.30 0.21 Conditional (4) d5/TTL 0.13 0.10 0.20 0.12 Conditional (5) d1/d2 9.02 9.91 7.05 9.99
- Conditional (7) Fno 1.75 1.75 1.75 1.75 A f 4.798 4.848 4.748 4.786
- a f1 5.076 5.187 5.028 5.537
- a f2 -39.910 -43.393 -28.569 -42.619
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Abstract
一种摄像光学镜头(10),涉及光学镜头领域,由物侧至像侧依序包括:一光圈(S1),一具有正屈折力的第一透镜(L1),一具有负屈折力的第二透镜(L2),一具有正屈折力的第三透镜(L3),一具有负屈折力的第四透镜(L4),一具有正屈折力的第五透镜(L5),以及一具有负屈折力的第六透镜(L6);整体摄像光学镜头(10)的焦距为f,第二透镜(L2)的焦距为f2,第四透镜(L4)的焦距为f4,第二透镜(L2)物侧面的曲率半径为R3,第二透镜(L2)像侧面的曲率半径为R4,第四透镜(L4)物侧面的曲率半径为R7,第四透镜(L4)像侧面的曲率半径为R8,满足下列关系式:-9.00≤f2/f≤-6.00,9.00≤f2/f4≤13.00,11.00≤(R3+R4)/(R3-R4)≤20.00,0.02≤R7/R8≤0.30。该摄像光学镜头(10)在具有良好光学性能的同时,满足广角化和超薄化的设计要求。
Description
本发明涉及光学镜头领域,特别涉及一种适用于智能手机、数码相机等手提终端设备,以及监视器、PC镜头等摄像装置的摄像光学镜头。
近年来,随着智能手机的兴起,小型化摄影镜头的需求日渐提高,而一般摄影镜头的感光器件不外乎是感光耦合器件(Charge Coupled Device,CCD)或互补性氧化金属半导体器件(Complementary Metal-OxideSemicondctor Sensor,CMOS Sensor)两种,且由于半导体制造工艺技术的精进,使得感光器件的像素尺寸缩小,再加上现今电子产品以功能佳且轻薄短小的外型为发展趋势,因此,具备良好成像品质的小型化摄像镜头俨然成为目前市场上的主流。
为获得较佳的成像品质,传统搭载于手机相机的镜头多采用三片式、四片式甚至是五片式透镜结构。然而,随着技术的发展以及用户多样化需求的增多,在感光器件的像素面积不断缩小,且***对成像品质的要求不断提高的情况下,六片式透镜结构逐渐出现在镜头设计当中,常见的六片式透镜虽然已经具有较好的光学性能,但是其光焦度、透镜间距和透镜形状设置仍然具有一定的不合理性,导致透镜结构在具有良好光学性能的同时,无法满足广角化和超薄化的设计要求。
针对上述问题,本发明的目的在于提供一种摄像光学镜头,其能在具有良好光学性能的同时,满足广角化和超薄化的设计要求。
为解决上述技术问题,本发明提供了一种摄像光学镜头,所述摄像光学镜头,由物侧至像侧依序包括:一光圈,一具有正屈折力的第一透镜,一具 有负屈折力的第二透镜,一具有正屈折力的第三透镜,一具有负屈折力的第四透镜,一具有正屈折力的第五透镜,以及一具有负屈折力的第六透镜;
整体摄像光学镜头的焦距为f,所述第二透镜的焦距为f2,所述第四透镜的焦距为f4,所述第二透镜物侧面的曲率半径为R3,所述第二透镜像侧面的曲率半径为R4,所述第四透镜物侧面的曲率半径为R7,所述第四透镜像侧面的曲率半径为R8,满足下列关系式:
-9.00≤f2/f≤-6.00,
9.00≤f2/f4≤13.00,
11.00≤(R3+R4)/(R3-R4)≤20.00,
0.02≤R7/R8≤0.30。
本发明相对于现有技术而言,规定了第二透镜焦距与整体摄像光学镜头焦距的比值,规定了第二透镜焦距与第四透镜焦距的比值,合理的分配了镜头的光焦度,并规定了第二透镜和第四透镜的形状,通过上述透镜的配置方式,使摄像光学镜头在具有良好光学性能的同时,满足广角化和超薄化的设计要求。
优选的,所述第三透镜的轴上厚度为d5,所述摄像光学镜头的光学总长为TTL,满足下列关系式:0.10≤d5/TTL≤0.20。
优选的,所述第一透镜的轴上厚度为d1,所述第一透镜的像侧面到所述第二透镜的物侧面的轴上距离为d2,满足下列关系式:7.00≤d1/d2≤10.00。
优选的,所述第六透镜物侧面的曲率半径为R11,所述第六透镜像侧面的曲率半径为R12,满足下列关系式:0.20≤(R11+R12)/(R11-R12)≤0.80。
图1是本发明的摄像光学镜头的第一实施方式的结构示意图;
图2是图1所示摄像光学镜头的轴向像差示意图;
图3是图1所示摄像光学镜头的倍率色差示意图;
图4是图1所示摄像光学镜头的像散场曲及畸变示意图;
图5是本发明的摄像光学镜头的第二实施方式的结构示意图;
图6是图5所示摄像光学镜头的轴向像差示意图;
图7是图5所示摄像光学镜头的倍率色差示意图;
图8是图5所示摄像光学镜头的像散场曲及畸变示意图;
图9是本发明的摄像光学镜头的第三实施方式的结构示意图;
图10是图9所示摄像光学镜头的轴向像差示意图;
图11是图9所示摄像光学镜头的倍率色差示意图;
图12是图9所示摄像光学镜头的像散场曲及畸变示意图。
图13是本发明的摄像光学镜头的第四实施方式的结构示意图;
图14是图13所示摄像光学镜头的轴向像差示意图;
图15是图13所示摄像光学镜头的倍率色差示意图;
图16是图13所示摄像光学镜头的像散场曲及畸变示意图。
为使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明的各实施方式进行详细的阐述。然而,本领域的普通技术人员可以理解,在本发明各实施方式中,为了使读者更好地理解本发明而提出了许多技术细节。但是,即使没有这些技术细节和基于以下各实施方式的种种变化和修改,也可以实现本发明所要求保护的技术方案。
(第一实施方式)
参考附图,本发明提供了一种摄像光学镜头10。图1所示为本发明第一实施方式的摄像光学镜头10,该摄像光学镜头10包括六个透镜。具体的,所述摄像光学镜头10,由物侧至像侧依序包括:光圈S1、第一透镜L1、第 二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5以及第六透镜L6。本实施方式中,优选的,在第六透镜L6和像面Si之间设置有玻璃平板GF等光学元件,其中玻璃平板GF可以是玻璃盖板,也可以是光学过滤片(filter),当然在其他可实施方式中,玻璃平板GF还可以设置在其他位置。
本实施方式中,第一透镜L1具有正屈折力,其物侧面向外凸出为凸面,其像侧面为凹面;第二透镜L2具有负屈折力,其物侧面为凸面,其像侧面为凹面;第三透镜L3具有正屈折力,其物侧面为凹面,其像侧面为凸面;第四透镜L4具有负屈折力,其物侧面为凹面,其像侧面为凸面;第五透镜L5具有正屈折力,其物侧面为凸面,其像侧面为凸面;第六透镜L6和具有负屈折力,其物侧面为凹面,其像侧面为凹面。
在此,定义整体摄像光学镜头10的焦距为f,所述第二透镜的焦距为f2,所述第四透镜的焦距为f4,所述第二透镜物侧面的曲率半径为R3,所述第二透镜像侧面的曲率半径为R4,所述第四透镜物侧面的曲率半径为R7,所述第四透镜像侧面的曲率半径为R8,满足下列关系式:
-9.00≤f2/f≤-6.00, (1)
9.00≤f2/f4≤13.00, (2)
11.00≤(R3+R4)/(R3-R4)≤20.00, (3)
0.02≤R7/R8≤0.30。 (4)
其中,条件式(1)规定了第二透镜L2的焦距与整体摄像光学镜头10焦距的比值,在此条件范围内时,能有效地平衡第一透镜产生的球差以及***的场曲。
条件式(2)规定了第二透镜L2的焦距和第四透镜L4焦距的比值。通过焦距的合理分配,使得***具有较佳的成像品质和较低的敏感性。
条件式(3)规定了第二透镜L2的形状,在此条件范围内时,有利于补 正轴上色像差。
条件式(4)规定了第四透镜L4的形状,在此条件范围外时,随着超薄广角化的发展,很难补正轴外画角的像差等问题。
本实施方式中,通过上述透镜的配置方式,使摄像光学镜头在具有良好光学性能的同时,满足广角化和超薄化的设计要求。
优选的,本发明实施方式中,所述第三透镜的轴上厚度为d5,所述摄像光学镜头的光学总长为TTL,满足下列关系式:
0.10≤d5/TTL≤0.20。 (5)
条件式(5)规定了第三透镜L3的轴上厚度d5与镜头光学总长TTL的比值,在此条件范围内时,有利于在超薄化的情况下提高***像质。
优选的,本实施方式中,所述第一透镜的轴上厚度为d1,所述第一透镜的像侧面到所述第二透镜的物侧面的轴上距离为d2,满足下列关系式:
7.00≤d1/d2≤10.00。 (6)
条件式(6)规定了第一透镜L1的轴上厚度与第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离的比值,在条件式范围内有助于压缩光学***总长,实现超薄化效果。
优选的,本实施方式中,所述第六透镜物侧面的曲率半径为R11,所述第六透镜像侧面的曲率半径为R12,满足下列关系式:
0.20≤(R11+R12)/(R11-R12)≤0.80。 (7)
条件式(7)规定了第六透镜L6的形状,在此条件范围内时,有利于补正轴外画角的像差。
此外,透镜的表面可以设置为非球面,非球面可以容易制作成球面以外的形状,获得较多的控制变数,用以消减像差,进而缩减透镜使用的数目,因此可以有效降低本发明摄像光学镜头的总长度。本发明实施例中,各个透 镜的物侧面和像侧面均为非球面。
值得一提的是,由于构成本实施方式的摄像光学透镜10的第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5以及第六透镜L6具有如前所述的结构和参数关系,因此,摄像光学镜头10能够合理分配各透镜的光焦度、面型以及各透镜的轴上厚度等,并因此校正了各类像差,本发明中摄像光学镜头10的光学总长TTL,摄像光学镜头10的像高IH,满足下列关系式:TTL/IH≤1.47;摄像光学镜头10的视场角FOV,满足以下关系式:FOV≥78度。实现了在具有良好光学成像性能的同时,满足广角化和超薄化的设计要求。
优选的,所述透镜的物侧面和/或像侧面上还可以设置有反曲点和/或驻点,以满足高品质的成像需求,具体的可实施方案,参下所述。
以下示出了本发明第一实施方式中摄像光学镜头10的设计数据。需要说明的是,本实施方式中,距离、半径和中心厚度的单位为毫米(mm)。
表1、表2示出本发明第一实施方式的摄像光学镜头10的设计数据。
【表1】
其中,各符号的含义如下。
S1:光圈;
R:光学面的曲率半径、透镜时为中心曲率半径;
R1:第一透镜L1的物侧面的曲率半径;
R2:第一透镜L1的像侧面的曲率半径;
R3:第二透镜L2的物侧面的曲率半径;
R4:第二透镜L2的像侧面的曲率半径;
R5:第三透镜L3的物侧面的曲率半径;
R6:第三透镜L3的像侧面的曲率半径;
R7:第四透镜L4的物侧面的曲率半径;
R8:第四透镜L4的像侧面的曲率半径;
R9:第五透镜L5的物侧面的曲率半径;
R10:第五透镜L5的像侧面的曲率半径;
R11:第六透镜L6的物侧面的曲率半径;
R12:第六透镜L6的像侧面的曲率半径;
R13:光学过滤片GF的物侧面的曲率半径;
R14:光学过滤片GF的像侧面的曲率半径;
d:透镜的轴上厚度与透镜之间的轴上距离;
d0:光圈S1到第一透镜L1的物侧面的轴上距离;
d1:第一透镜L1的轴上厚度;
d2:第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离;
d3:第二透镜L2的轴上厚度;
d4:第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离;
d5:第三透镜L3的轴上厚度;
d6:第三透镜L3的像侧面到第四透镜L4的物侧面的轴上距离;
d7:第四透镜L4的轴上厚度;
d8:第四透镜L4的像侧面到第五透镜L5的物侧面的轴上距离;
d9:第五透镜L5的轴上厚度;
d10:第五透镜L5的像侧面到第六透镜L6的物侧面的轴上距离;
d11:第六透镜L6的轴上厚度;
d12:第六透镜L6的像侧面到光学过滤片GF的物侧面的轴上距离;
d13:光学过滤片GF的轴上厚度;
d14:光学过滤片GF的像侧面到像面的轴上距离;
nd:d线的折射率;
nd1:第一透镜L1的d线的折射率;
nd2:第二透镜L2的d线的折射率;
nd3:第三透镜L3的d线的折射率;
nd4:第四透镜L4的d线的折射率;
nd5:第五透镜L5的d线的折射率;
nd6:第六透镜L6的d线的折射率;
ndg:光学过滤片GF的d线的折射率;
vd:阿贝数;
v1:第一透镜L1的阿贝数;
v2:第二透镜L2的阿贝数;
v3:第三透镜L3的阿贝数;
v4:第四透镜L4的阿贝数;
v5:第五透镜L5的阿贝数;
v6:第六透镜L6的阿贝数;
vg:光学过滤片GF的阿贝数。
表2示出本发明第一实施方式的摄像光学镜头10中各透镜的非球面数据。
【表2】
其中,k是圆锥系数,A4、A6、A8、A10、A12、A14、A16、A18、A20是非球面系数。
IH:像高
y=(x
2/R)/[1+{1-(k+1)(x
2/R
2)}
1/2]+A4x
4+A6x
6+A8x
8+A10x
10+A12x
12+A14x
14+A16x
16+A18x
18+A20x
20 (8)
为方便起见,各个透镜面的非球面使用上述公式(8)中所示的非球面。但是,本发明不限于该公式(8)表示的非球面多项式形式。
表3、表4示出本发明第一实施方式的摄像光学镜头10中各透镜的反曲点以及驻点设计数据。其中,P1R1、P1R2分别代表第一透镜L1的物侧面和像侧面,P2R1、P2R2分别代表第二透镜L2的物侧面和像侧面,P3R1、P3R2分别代表第三透镜L3的物侧面和像侧面,P4R1、P4R2分别代表第四透镜L4的物侧面和像侧面,P5R1、P5R2分别代表第五透镜L5的物侧面和像侧面,P6R1、P6R2分别代表第六透镜L6的物侧面和像侧面。“反曲点位置”栏位对应数据为各透镜表面所设置的反曲点到摄像光学镜头10光轴的垂直距离。“驻点位置”栏位对应数据为各透镜表面所设置的驻点到摄像光学镜头10光轴的垂直距离。
【表3】
反曲点个数 | 反曲点位置1 | 反曲点位置2 | 反曲点位置3 | |
P1R1 | 1 | 1.255 | ||
P1R2 | 1 | 0.555 | ||
P2R1 | ||||
P2R2 | ||||
P3R1 | ||||
P3R2 | ||||
P4R1 | ||||
P4R2 | 1 | 1.275 | ||
P5R1 | 2 | 0.735 | 1.975 | |
P5R2 | 3 | 0.205 | 0.675 | 2.445 |
P6R1 | 1 | 1.655 | ||
P6R2 | 2 | 0.545 | 3.225 |
【表4】
图2、图3分别示出了波长为435nm、486nm、546nm、587nm和656nm的光经过第一实施方式的摄像光学镜头10后的轴向像差以及倍率色差示意图。图4则示出了,波长为546nm的光经过第一实施方式的摄像光学镜头10后的场曲及畸变示意图,图4的场曲S是弧矢方向的场曲,T是子午方向的场曲。
后出现的表17示出各实例1、2、3、4中各种数值与条件式中已规定的参数所对应的值。
如表17所示,第一实施方式满足各条件式。
在本实施方式中,所述摄像光学镜头的入瞳直径为2.742mm,全视场像高为4.00mm,对角线方向的视场角为78.84°,具有良好光学性能的同时,满足广角化和超薄化的设计要求。
(第二实施方式)
第二实施方式与第一实施方式基本相同,符号含义与第一实施方式相同,以下只列出不同点。
表5、表6示出本发明第二实施方式的摄像光学镜头20的设计数据。
【表5】
表6示出本发明第二实施方式的摄像光学镜头20中各透镜的非球面数据。
【表6】
表7、表8示出本发明第二实施方式的摄像光学镜头20中各透镜的反曲点以及驻点设计数据。
【表7】
【表8】
驻点个数 | 驻点位置1 | 驻点位置2 | |
P1R1 | |||
P1R2 | 1 | 0.985 | |
P2R1 | |||
P2R2 | |||
P3R1 | |||
P3R2 | |||
P4R1 | |||
P4R2 | |||
P5R1 | 1 | 1.265 | |
P5R2 | 2 | 0.105 | 1.045 |
P6R1 | |||
P6R2 | 1 | 1.035 |
图6、图7分别示出了波长为435nm、486nm、546nm、587nm和656nm的光经过第二实施方式的摄像光学镜头20后的轴向像差以及倍率色差示意图。图8则示出了,波长为546nm的光经过第二实施方式的摄像光学镜头20后的场曲及畸变示意图。
如表17所示,第二实施方式满足各条件式。
在本实施方式中,所述摄像光学镜头的入瞳直径为2.770mm,全视场像高为4.00mm,对角线方向的视场角为78.26°,具有良好光学性能的同时,满足广角化和超薄化的设计要求。
(第三实施方式)
第三实施方式与第一实施方式基本相同,符号含义与第一实施方式相同,以下只列出不同点。
表9、表10示出本发明第三实施方式的摄像光学镜头30的设计数据。
【表9】
表10示出本发明第三实施方式的摄像光学镜头30中各透镜的非球面数据。
【表10】
表11、表12示出本发明第三实施方式的摄像光学镜头30中各透镜的反曲点以及驻点设计数据。
【表11】
反曲点个数 | 反曲点位置1 | 反曲点位置2 | |
P1R1 | |||
P1R2 | |||
P2R1 | 1 | 0.885 | |
P2R2 | 1 | 1.045 | |
P3R1 | 2 | 0.505 | 1.015 |
P3R2 | 2 | 0.675 | 1.025 |
P4R1 | 2 | 0.735 | 1.065 |
P4R2 | 1 | 1.185 | |
P5R1 | 2 | 0.595 | 1.855 |
P5R2 | |||
P6R1 | 1 | 1.625 | |
P6R2 | 2 | 0.595 | 2.965 |
【表12】
驻点个数 | 驻点位置1 | 驻点位置2 | |
P1R1 | |||
P1R2 | |||
P2R1 | |||
P2R2 | |||
P3R1 | 2 | 0.785 | 1.085 |
P3R2 | |||
P4R1 | |||
P4R2 | |||
P5R1 | 1 | 0.975 | |
P5R2 | |||
P6R1 | |||
P6R2 | 1 | 1.355 |
图10、图11分别示出了波长为435nm、486nm、546nm、587nm和656nm的光经过第三实施方式的摄像光学镜头30后的轴向像差以及倍率色差示意图。图12则示出了,波长为546nm的光经过第三实施方式的摄像光学镜头30后的场曲及畸变示意图。
如表17所示,第三实施方式满足各条件式。
在本实施方式中,所述摄像光学镜头的入瞳直径为2.713mm,全视场像 高为4.00mm,对角线方向的视场角为79.41°,具有良好光学性能的同时,满足广角化和超薄化的设计要求。
(第四实施方式)
第四实施方式与第一实施方式基本相同,符号含义与第一实施方式相同,以下只列出不同点。
表13、表14示出本发明第四实施方式的摄像光学镜头40的设计数据。
【表13】
表14示出本发明第四实施方式的摄像光学镜头40中各透镜的非球面数据。
【表14】
表15、表16示出本发明第四实施方式的摄像光学镜头40中各透镜的反曲点以及驻点设计数据。
【表15】
反曲点个数 | 反曲点位置1 | 反曲点位置2 | |
P1R1 | |||
P1R2 | 1 | 1.085 | |
P2R1 | |||
P2R2 | |||
P3R1 | 1 | 1.205 | |
P3R2 | |||
P4R1 | |||
P4R2 | 2 | 1.215 | 1.645 |
P5R1 | 2 | 0.755 | 2.035 |
P5R2 | 2 | 0.185 | 0.705 |
P6R1 | 1 | 1.625 | |
P6R2 | 2 | 0.575 | 2.985 |
【表16】
驻点个数 | 驻点位置1 | 驻点位置2 | |
P1R1 | |||
P1R2 | |||
P2R1 | |||
P2R2 | |||
P3R1 | |||
P3R2 | |||
P4R1 | |||
P4R2 | |||
P5R1 | 1 | 1.275 | |
P5R2 | 2 | 0.335 | 0.925 |
P6R1 | 1 | 2.885 | |
P6R2 | 1 | 1.185 |
图14、图15分别示出了波长为435nm、486nm、546nm、587nm和656nm的光经过第四实施方式的摄像光学镜头40后的轴向像差以及倍率色差示意图。图16则示出了,波长为546nm的光经过第四实施方式的摄像光学镜头40后的场曲及畸变示意图。
如表17所示,第四实施方式满足各条件式。
在本实施方式中,所述摄像光学镜头的入瞳直径为2.735mm,全视场像高为4.00mm,对角线方向的视场角为78.98°,具有良好光学性能的同时,满足广角化和超薄化的设计要求。
【表17】
实施例1 | 实施例2 | 实施例3 | 实施例4 | 备注 | |
f2/f | -8.32 | -8.95 | -6.02 | -8.90 | 条件式(1) |
f2/f4 | 11.71 | 12.90 | 9.06 | 11.08 | 条件式(2) |
(R3+R4)/(R3-R4) | 11.24 | 11.10 | 12.16 | 19.89 | 条件式(3) |
R7/R8 | 0.03 | 0.02 | 0.30 | 0.21 | 条件式(4) |
d5/TTL | 0.13 | 0.10 | 0.20 | 0.12 | 条件式(5) |
d1/d2 | 9.02 | 9.91 | 7.05 | 9.99 | 条件式(6) |
(R11+R12)/(R11-R12) | 0.28 | 0.21 | 0.79 | 0.59 | 条件式(7) |
Fno | 1.75 | 1.75 | 1.75 | 1.75 | |
f | 4.798 | 4.848 | 4.748 | 4.786 | |
f1 | 5.076 | 5.187 | 5.028 | 5.537 | |
f2 | -39.910 | -43.393 | -28.569 | -42.619 | |
f3 | 4.083 | 3.993 | 3.063 | 4.240 | |
f4 | -3.409 | -3.364 | -3.154 | -3.848 | |
f5 | 5.016 | 5.085 | 4.215 | 5.306 | |
f6 | -3.525 | -3.782 | -2.659 | -4.016 |
本领域的普通技术人员可以理解,上述各实施方式是实现本发明的具体实施方式,而在实际应用中,可以在形式上和细节上对其作各种改变,而不偏离本发明的精神和范围。
Claims (4)
- 一种摄像光学镜头,其特征在于,所述摄像光学镜头,由物侧至像侧依序包括:一光圈,一具有正屈折力的第一透镜,一具有负屈折力的第二透镜,一具有正屈折力的第三透镜,一具有负屈折力的第四透镜,一具有正屈折力的第五透镜,以及一具有负屈折力的第六透镜;整体摄像光学镜头的焦距为f,所述第二透镜的焦距为f2,所述第四透镜的焦距为f4,所述第二透镜物侧面的曲率半径为R3,所述第二透镜像侧面的曲率半径为R4,所述第四透镜物侧面的曲率半径为R7,所述第四透镜像侧面的曲率半径为R8,满足下列关系式:-9.00≤f2/f≤-6.00,9.00≤f2/f4≤13.00,11.00≤(R3+R4)/(R3-R4)≤20.00,0.02≤R7/R8≤0.30。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第三透镜的轴上厚度为d5,所述摄像光学镜头的光学总长为TTL,满足下列关系式:0.10≤d5/TTL≤0.20。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第一透镜的轴上厚度为d1,所述第一透镜的像侧面到所述第二透 镜的物侧面的轴上距离为d2,满足下列关系式:7.00≤d1/d2≤10.00。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第六透镜物侧面的曲率半径为R11,所述第六透镜像侧面的曲率半径为R12,满足下列关系式:0.20≤(R11+R12)/(R11-R12)≤0.80。
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