WO2021114083A1 - 摄像光学镜头 - Google Patents
摄像光学镜头 Download PDFInfo
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- WO2021114083A1 WO2021114083A1 PCT/CN2019/124286 CN2019124286W WO2021114083A1 WO 2021114083 A1 WO2021114083 A1 WO 2021114083A1 CN 2019124286 W CN2019124286 W CN 2019124286W WO 2021114083 A1 WO2021114083 A1 WO 2021114083A1
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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
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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
Definitions
- the present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.
- the photosensitive devices of general photographic lenses are nothing more than photosensitive coupling devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor devices (Complementary Metal -OxideSemiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced, and the development trend of current electronic products with good functions, thin and short appearance, therefore, has a good
- the miniaturized camera lens with image quality has become the mainstream in the current market.
- the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element lens structure.
- the four-element lens structure gradually appears in the lens design.
- the four-element lens has good optical performance, its optical power, lens spacing and lens shape settings are still unreasonable, resulting in the lens structure not being able to meet good optical performance while meeting large aperture, Ultra-thin design requirements.
- the object of the present invention is to provide an imaging optical lens, which not only has good optical performance, but also satisfies the design requirements of large aperture and ultra-thinness.
- an embodiment of the present invention provides an imaging optical lens, from the object side to the image side, including: a first lens with positive refractive power, a second lens with positive refractive power, and positive refractive power.
- a powerful third lens and a fourth lens ; the overall focal length of the imaging optical lens is f, the focal length of the second lens is f2, the radius of curvature of the object side of the fourth lens is R7, and the fourth lens
- the radius of curvature of the mirror image side is R8, the on-axis thickness of the first lens is d1, the on-axis thickness of the third lens is d5, and the image side of the third lens is to the object side of the fourth lens.
- the distance on the axis is d6, which satisfies the following relationship: 2.50 ⁇ f2/f ⁇ 5.00; 12.00 ⁇ d5/d6 ⁇ 25.00; 0.20 ⁇ d1/f ⁇ 0.50; 3.00 ⁇ (R7+R8)/(R7-R8) ⁇ 15.00 .
- the focal length of the third lens is f3, and the following relationship is satisfied: 0.50 ⁇ f3/f ⁇ 2.00.
- the radius of curvature of the object side surface of the first lens is R1
- the radius of curvature of the image side surface of the first lens is R2, and the following relationship is satisfied: -10.00 ⁇ (R1+R2)/(R1-R2) ⁇ -3.00.
- the on-axis thickness of the second lens is d3, and the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, which satisfies the following relationship: 2.50 ⁇ d3/d4 ⁇ 5.00.
- the aperture F number of the imaging optical lens is less than or equal to 1.15.
- the focal length of the first lens is f1
- the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 1.16 ⁇ f1/f ⁇ 4.71; 0.07 ⁇ d1/TTL ⁇ 0.38.
- the radius of curvature of the object side surface of the second lens is R3
- the radius of curvature of the image side surface of the second lens is R4
- the axial thickness of the second lens is d3
- the total optical length of the imaging optical lens is TTL, and satisfies the following relationship: -4.08 ⁇ (R3+R4)/(R3-R4) ⁇ -0.42; 0.06 ⁇ d3/TTL ⁇ 0.19.
- the radius of curvature of the object side of the third lens is R5
- the radius of curvature of the image side of the third lens is R6
- the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 1.29 ⁇ (R5 +R6)/(R5-R6) ⁇ 7.36; 0.07 ⁇ d5/TTL ⁇ 0.30.
- the focal length of the fourth lens is f4
- the axial thickness of the fourth lens is d7
- the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -9.84 ⁇ f4/f ⁇ 9.32 ;0.05 ⁇ d7/TTL ⁇ 0.21.
- the combined focal length of the first lens and the second lens is f12, which satisfies the following relationship: 1.35 ⁇ f12/f ⁇ 5.22. .
- the beneficial effect of the present invention is that the present invention provides a TOF camera optical lens with good optical performance and meeting the design requirements of wide-angle and large aperture.
- FIG. 1 is a schematic diagram of the structure of an imaging optical lens in the first embodiment of the present invention
- FIG. 2 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;
- FIG. 3 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention.
- FIG. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 3;
- FIG. 5 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention.
- FIG. 6 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5.
- FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
- the imaging optical lens 10 includes four lenses.
- the imaging optical lens 10 includes an aperture S1, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order from the object side to the image side.
- an optical element such as a glass plate GF is arranged between the fourth lens L4 and the image plane Si.
- the glass plate GF can be a glass cover plate or an optical filter, of course, In other possible embodiments, the glass plate GF can also be arranged in other positions.
- the first lens L1 has positive refractive power
- the second lens L2 has positive refractive power
- the third lens L3 has positive refractive power
- the focal length of the entire imaging optical lens is defined as f
- the focal length of the second lens L2 is f2
- the radius of curvature of the object side of the fourth lens L4 is R7
- the radius of curvature of the image side of the fourth lens L4 is R8, and the first lens L1
- the on-axis thickness of the third lens L3 is d1
- the on-axis thickness of the third lens L3 is d5
- the imaging optical lens satisfies the following relationship formula:
- conditional formula (1) specifies the ratio of the focal length f2 of the second lens L2 to the total focal length f of the system, which can effectively balance the spherical aberration generated by the first lens L1 and the field curvature of the system.
- Conditional expression (2) specifies the ratio of the on-axis thickness d5 of the third lens L3 and the on-axis distance d6 between the image side surface of the third lens L3 and the object side surface of the fourth lens L4, which contributes to the range of the conditional expression Lens processing and lens assembly.
- d5 the ratio of the on-axis thickness of the third lens L3 and the on-axis distance d6 between the image side surface of the third lens L3 and the object side surface of the fourth lens L4
- the range of the conditional expression Lens processing and lens assembly Preferably, 13.62 ⁇ d5/d6 ⁇ 24.94.
- Conditional formula (3) specifies the ratio of the on-axis thickness d1 of the first lens L1 to the total focal length f of the system. Within this conditional range, it is beneficial to achieve ultra-thinness. Preferably, 0.23 ⁇ d1/f ⁇ 0.48.
- Conditional expression (4) specifies the shape of the fourth lens L4. Within this range, with the development of ultra-thin and wide-angle, it is beneficial to correct the off-axis angle of view aberration and other problems. Preferably, 3.20 ⁇ (R7+R8)/(R7-R8) ⁇ 14.93.
- each lens (L1, L2, L3, L4) with different refractive power is used to make the optical system have good optical performance while satisfying the design of large aperture and wide-angle. Claim.
- the focal length of the third lens is defined as f3, and the imaging optical lens satisfies the following relationship:
- Conditional formula (5) specifies the ratio of the focal length f3 of the third lens L3 to the total focal length f, and the reasonable distribution of the optical power enables the system to have better imaging quality and lower sensitivity. Preferably, 0.67 ⁇ f3/f ⁇ 1.95.
- the conditional expression (6) specifies the shape of the first lens L1.
- the shape of the first lens L1 is within the range of the conditional expression, the aberration of the optical system can be corrected, thereby improving the imaging quality.
- the imaging optical lens satisfies the following relationship:
- the conditional expression (7) specifies the ratio of the on-axis thickness d3 of the second lens L2 to the on-axis distance d4 from the image side surface of the second lens L2 to the object side surface of the third lens L3, which helps compress optics within the scope of the conditional expression
- the total length of the system achieves ultra-thin effect.
- the focal length of the first lens L1 is defined as f1, and the imaging optical lens satisfies the following relationship: 1.16 ⁇ f1/f ⁇ 4.71, which specifies the ratio of the focal length of the first lens L1 to the overall focal length.
- the first lens has an appropriate positive refractive power, which is beneficial to reduce system aberrations, and at the same time, is beneficial to the development of ultra-thin and wide-angle lenses.
- the axial thickness of the first lens L1 is d1
- the total optical length of the imaging optical lens is TTL.
- the imaging optical lens satisfies the following relationship: 0.07 ⁇ d1/TTL ⁇ 0.38, which specifies the axial thickness of the first lens L1 and the imaging
- the ratio of the total optical length of the optical lens 10 to TTL is conducive to achieving ultra-thinness.
- 0.12 ⁇ d1/TTL 0.12 ⁇ d1/TTL ⁇ 0.31.
- the curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: -4.08 ⁇ (R3+R4)/(R3-R4) ⁇ -0.42.
- R3+R4/(R3-R4) ⁇ -0.42 When the shape of the two lens L2 is within the range, as the lens becomes ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration.
- the on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.06 ⁇ d3/TTL ⁇ 0.19, which specifies the ratio of the on-axis thickness of the second lens L2 to the total optical length TTL of the imaging optical lens 10, which is conducive to achieving ultra-thin ⁇ .
- the curvature radius of the object side surface of the third lens L3 is R5, and the curvature radius of the image side surface of the third lens L3 is R6, which satisfies the following relationship: 1.29 ⁇ (R5+R6)/(R5-R6) ⁇ 7.36, which can effectively control the third lens
- the shape of the lens L3 is conducive to the molding of the third lens L3.
- the degree of deflection of the light passing through the lens can be eased, and aberrations can be effectively reduced.
- the on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.07 ⁇ d5/TTL ⁇ 0.30, which specifies the ratio of the on-axis thickness of the third lens L3 to the total optical length TTL of the imaging optical lens 10, which is conducive to achieving ultra-thin ⁇ .
- the focal length of the fourth lens L4 is f4, which satisfies the following relational expression: -9.84 ⁇ f4/f ⁇ 9.32.
- the reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity.
- the on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.05 ⁇ d7/TTL ⁇ 0.21, which specifies the ratio of the on-axis thickness of the fourth lens L4 to the total optical length TTL of the imaging optical lens 10, which is conducive to achieving super Thinning.
- 0.07 ⁇ d7/TTL 0.07 ⁇ d7/TTL ⁇ 0.17.
- the combined focal length of the first lens L1 and the second lens L2 is defined as f12, which satisfies the following relational expression: 1.35 ⁇ f12/f ⁇ 5.22.
- the imaging optics can be eliminated
- the aberration and distortion of the lens 10 can suppress the back focal length of the imaging optical lens 10 and maintain the miniaturization of the image lens system group.
- the aperture F number of the imaging optical lens 10 is less than or equal to 1.15. Large aperture, good imaging performance. Preferably, the aperture F number is less than or equal to 1.13.
- the imaging The optical lens 10 can reasonably allocate the focal power, surface shape, material, and axial thickness of each lens, etc., and therefore correct various aberrations, and achieve good optical imaging performance while satisfying large aperture, Wide-angle and ultra-thin design requirements.
- the imaging optical lens of this application is a TOF (Time of flight) receiving end lens.
- the principle of TOF technology is that the transmitting end lens emits an infrared surface light source, which is reflected back on the object, and the receiving end lens receives the reflected infrared light information. This process The 3D recognition process is realized.
- the working wavelength range of the imaging optical lens of this application is 920nm-960nm.
- TTL Total optical length (the on-axis distance from the object side of the first lens L1 to the imaging surface), in mm.
- FIG. 1 is a schematic diagram of the structure of an imaging optical lens 10 in the first embodiment.
- Table 1 lists the object side and image side curvature radius R of the first lens L1 to the fourth lens L4 constituting the imaging optical lens 10 in the first embodiment of the present invention, the center thickness of the lens, the distance d between the lenses, and the refractive index. nd and Abbe number vd.
- Table 2 shows the conic coefficient k and the aspherical coefficient of the imaging optical lens 10. It should be noted that, in this embodiment, the unit of distance, radius, and center thickness is millimeter (mm).
- R The radius of curvature of the optical surface, and the radius of curvature of the center of the lens
- R1 the radius of curvature of the object side surface of the first lens L1;
- R2 the radius of curvature of the image side surface of the first lens L1;
- R3 the radius of curvature of the object side surface of the second lens L2;
- R4 the radius of curvature of the image side surface of the second lens L2;
- R5 the radius of curvature of the object side surface of the third lens L3;
- R6 the radius of curvature of the image side surface of the third lens L3;
- R7 the radius of curvature of the object side of the fourth lens L4;
- R8 the radius of curvature of the image side surface of the fourth lens L4;
- R9 the curvature radius of the object side surface of the glass plate GF
- R10 the radius of curvature of the image side surface of the glass plate GF
- d the on-axis thickness of the lens or the on-axis distance between adjacent lenses
- d0 the on-axis distance from the aperture S1 to the object side of the first lens L1;
- d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;
- d4 the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;
- d6 the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;
- nd refractive index of d-line
- nd1 the refractive index of the d-line of the first lens L1;
- nd2 the refractive index of the d-line of the second lens L2;
- nd3 the refractive index of the d-line of the third lens L3;
- nd4 the refractive index of the d-line of the fourth lens L4;
- ndg the refractive index of the d-line of the glass plate GF
- vg Abbe number of glass plate GF.
- Table 2 shows the aspheric surface data of each lens of the imaging optical lens 10 provided by the first embodiment of the present invention.
- k is the conic coefficient
- A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.
- the aspheric surface of each lens in this embodiment preferably uses the aspheric surface shown in the following conditional expression (6), but the specific form of the following conditional expression (6) is only an example. In fact, It is not limited to the aspheric polynomial form shown in the conditional expression (6).
- Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the embodiment of the present invention.
- P1R1 and P2R2 represent the object side and image side of the first lens L1 respectively
- P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively
- P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively
- P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, respectively.
- the corresponding data in the “reflection 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 data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.
- FIG. 2 shows a schematic diagram of field curvature and distortion after light with a wavelength of 940 nm passes through the imaging optical lens 10 of the first embodiment.
- the curvature of field S in Fig. 2 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.
- Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
- the first embodiment satisfies various conditional expressions.
- the entrance pupil diameter of the imaging optical lens 10 is 1.650mm
- the full field of view image height is 1.500mm
- the diagonal field angle is 77.80°
- the aperture F number is 1.136
- FIG. 3 is a schematic diagram of the structure of the imaging optical lens 20 in the second embodiment.
- the second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
- Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
- Table 6 shows the aspheric surface data of each lens of the imaging optical lens 20 according to the second embodiment of the present invention.
- Table 7 and Table 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 of the embodiment of the present invention.
- FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 940 nm after passing through the imaging optical lens 20 of the second embodiment.
- the curvature of field S in Fig. 4 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.
- Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
- the second embodiment satisfies various conditional expressions.
- the entrance pupil diameter of the imaging optical lens 20 is 1.491 mm
- the full field of view image height is 1.500 mm
- the diagonal field angle is 79.80°
- the aperture F number is 1.150
- FIG. 5 is a schematic diagram of the structure of the imaging optical lens 30 in the third embodiment.
- the third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
- Table 9 and Table 10 show design data of the imaging optical lens 30 of the third embodiment of the present invention.
- Table 10 shows the aspheric surface data of each lens of the imaging optical lens 30 according to 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 embodiment of the present invention.
- FIG. 6 shows a schematic diagram of field curvature and distortion of light with a wavelength of 940 nm after passing through the imaging optical lens 30 of the third embodiment.
- the curvature of field S in Fig. 6 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.
- Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
- the third embodiment satisfies various conditional expressions.
- the entrance pupil diameter of the imaging optical lens 30 is 1.650mm
- the full field of view image height is 1.500mm
- the diagonal field angle is 77.40°
- the aperture F number is 0.995
- Table 13 lists the values of the corresponding conditional expressions in the first embodiment, the second embodiment, and the third embodiment according to the above conditional expressions, as well as the values of other related parameters.
- Example 1 Example 2
- Example 3 f2/f 2.600 4.117 4.899 d5/d6 15.233 19.935 24.882 d1/f 0.250 0.266 0.462 (R7+R8)/(R7-R8) 7.452 3.403 14.846 FNO 1.136 1.150 0.995 f 1.875 1.714 1.641 f1 4.922 3.980 5.158 f2 4.875 7.057 8.039 f3 2.934 1.449 3.117 f4 -9.225 -2.404 10.201 f12 2.707 2.764 3.483
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Abstract
一种摄像光学镜头(10),其由物侧至像侧依序包括:具有正屈折力的第一透镜(L1),具有正屈折力的第二透镜(L2),具有正屈折力的第三透镜(L3),以及第四透镜(L4);摄像光学镜头(10)整体的焦距为f,第二透镜(L2)的焦距为f2,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,第一透镜(L1)的轴上厚度为d1,第三透镜(L4)的轴上厚度为d5,第三透镜(L3)的像侧面到第四透镜(L4)的物侧面的轴上距离为d6,满足下列关系式:2.50≤f2/f≤5.00;12.00≤d5/d6≤25.00;0.20≤d1/f≤0.50;3.00≤(R7+R8)/(R7-R8)≤15.00。该摄像光学镜头(10)能在具有良好光学性能的同时,满足大光圈、广角化的设计要求。
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-OxideSemiconductor 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,四片式透镜结构逐渐出现在镜头设计当中,常见的四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,导致透镜结构无法满足具有良好光学性能的同时,满足大光圈、超薄化的设计要求。
发明内容
针对上述问题,本发明的目的在于提供一种摄像光学镜头,其在具有良好光学性能的同时,满足大光圈、超薄化的设计要求。
为解决上述技术问题,本发明的实施方式提供了一种摄像光学镜头,由物侧至像侧依序包括:具有正屈折力的第一透镜,具有正屈折力的第二透镜,具有正屈折力的第三透镜,以及第四透镜;所述摄像光学镜头整体的焦距为f,所述第二透镜的焦距为f2,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,所述第一透镜的轴上厚度为d1, 所述第三透镜的轴上厚度为d5,所述第三透镜的像侧面到所述第四透镜的物侧面的轴上距离为d6,满足下列关系式:2.50≤f2/f≤5.00;12.00≤d5/d6≤25.00;0.20≤d1/f≤0.50;3.00≤(R7+R8)/(R7-R8)≤15.00。
优选地,所述第三透镜的焦距为f3,且满足下列关系式:0.50≤f3/f≤2.00。
优选地,所述第一透镜物侧面的曲率半径为R1,所述第一透镜像侧面的曲率半径为R2,且满足下列关系式:-10.00≤(R1+R2)/(R1-R2)≤-3.00。
优选地,所述第二透镜的轴上厚度为d3,所述第二透镜的像侧面到所述第三透镜的物侧面的轴上距离为d4,满足下列关系式:2.50≤d3/d4≤5.00。
优选地,所述摄像光学镜头的光圈F数小于或等于1.15。
优选地,所述第一透镜的焦距为f1,所述摄像光学镜头的光学总长为TTL,满足下列关系式:1.16≤f1/f≤4.71;0.07≤d1/TTL≤0.38。
优选地,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,所述第二透镜的轴上厚度为d3,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:-4.08≤(R3+R4)/(R3-R4)≤-0.42;0.06≤d3/TTL≤0.19。
优选地,所述第三透镜物侧面的曲率半径为R5,所述第三透镜像侧面的曲率半径为R6,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:1.29≤(R5+R6)/(R5-R6)≤7.36;0.07≤d5/TTL≤0.30。
优选地,所述第四透镜的焦距为f4,所述第四透镜的轴上厚度为d7,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:-9.84≤f4/f≤9.32;0.05≤d7/TTL≤0.21。
优选地,所述第一透镜与所述第二透镜的组合焦距为f12,满足下列关系式:1.35≤f12/f≤5.22。。
本发明的有益效果在于:本发明提供具有良好光学性能、且满足广角化、大光圈设计需求的TOF摄像光学镜头。
图1是本发明第一实施方式中摄像光学镜头的结构示意图;
图2是图1所示摄像光学镜头的场曲及畸变示意图;
图3是本发明第二实施方式的摄像光学镜头的结构示意图;
图4是图3所示摄像光学镜头的场曲及畸变示意图;
图5是本发明第三实施方式的摄像光学镜头的结构示意图;
图6是图5所示摄像光学镜头的场曲及畸变示意图。
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包括四个透镜。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以及第四透镜L4。本实施方式中,优选的,在第四透镜L4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;第二透镜L2具有正屈折力;第三透镜L3具有正屈折力。
在此,定义摄像光学镜头整体的焦距为f,第二透镜L2的焦距为f2,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,第一透镜L1的轴上厚度为d1,第三透镜L3的轴上厚度为d5,第三透镜L3的像侧面到所述第四透镜L4的物侧面的轴上距离为d6,所述摄像光学镜头满足下列关系式:
2.50≤f2/f≤5.00 (1)
12.00≤d5/d6≤25.00 (2)
0.20≤d1/f≤0.50 (3)
3.00≤(R7+R8)/(R7-R8)≤15.00 (4)
其中,条件式(1)规定了第二透镜L2的焦距f2与***总焦距f的比值,可以有效地平衡由具有第一透镜L1产生的球差以及***的场曲量。优选地,2.55≤f2/f≤4.95。
条件式(2)规定了第三透镜L3的轴上厚度d5和第三透镜L3的像侧面与第四透镜L4的物侧面之间的轴上距离d6的比值,在条件式范围内有助于镜片的加工和镜头的组装。优选地,13.62≤d5/d6≤24.94。
条件式(3)规定了第一透镜L1的轴上厚度d1与***总焦距f的比值,在此条件范围内,有利于实现超薄化。优选地,0.23≤d1/f≤0.48。
条件式(4)规定了第四透镜L4的形状,在此范围内时,随着超薄广角化的发展,有利于补正轴外画角的像差等问题。优选地,3.20≤(R7+R8)/(R7-R8)≤14.93。
本实施方式中,通过上述透镜的配置方式,利用具有不同屈折力的各个透镜(L1、L2、L3、L4),使光学***在具有良好光学性能的同时,满足大光圈、广角化化的设计要求。
具体的,本发明实施方式中,定义所述第三透镜的焦距为f3,所述摄像光学镜头满足下列关系式:
0.50≤f3/f≤2.00 (5)
条件式(5)规定了第三透镜L3的焦距f3与总焦距f的比值,通过光焦度的合理分配,使得***具有较佳的成像品质和较低的敏感性。优选地,0.67≤f3/f≤1.95。
定义第一透镜物侧面的曲率半径为R1,第一透镜像侧面的曲率半径为R2,所述摄像光学镜头满足下列关系式:
-10.00≤(R1+R2)/(R1-R2)≤-3.00 (6)
条件式(6)规定了第一透镜L1的形状,在条件式范围内时,可以对光学***的像差进行校正,进而提升成像品质。优选地,-9.50≤(R1+R2)/(R1-R2)≤-3.14。
定义第二透镜L2的轴上厚度为d3,第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离为d4,所述摄像光学镜头满足下列关系式:
2.50≤d3/d4≤5.00 (7)
条件式(7)规定了第二透镜L2的轴上厚度d3与第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离d4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。优选地,2.52≤d3/d4≤4.56。
优选的,本实施方式中,定义第一透镜L1的焦距为f1,所述摄像光学镜头满足下列关系式:1.16≤f1/f≤4.71,规定了第一透镜L1的焦距与整体 焦距的比值。在规定的范围内时,第一透镜具有适当的正屈折力,有利于减小***像差,同时有利于镜头向超薄化、广角化发展。优选地,1.86≤f1/f≤3.77。
第一透镜L1的轴上厚度为d1,摄像光学镜头的光学总长为TTL,所述摄像光学镜头满足下列关系式:0.07≤d1/TTL≤0.38,规定了第一透镜L1的轴上厚度与摄像光学镜头10的光学总长TTL的比值,有利于实现超薄化。优选地,0.12≤d1/TTL≤0.31。
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,满足下列关系式:-4.08≤(R3+R4)/(R3-R4)≤-0.42,规定了第二透镜L2的形状,在范围内时,随着镜头向超薄广角化发展,有利于补正轴上色像差问题。优选地,-2.55≤(R3+R4)/(R3-R4)≤-0.53。
第二透镜L2的轴上厚度为d3,满足下列关系式:0.06≤d3/TTL≤0.19,规定了第二透镜L2的轴上厚度与摄像光学镜头10的光学总长TTL的比值有利于实现超薄化。优选地,0.09≤d3/TTL≤0.15。
第三透镜L3物侧面的曲率半径为R5,第三透镜L3像侧面的曲率半径为R6,满足下列关系式:1.29≤(R5+R6)/(R5-R6)≤7.36,可有效控制第三透镜L3的形状,有利于第三透镜L3成型,在条件式规定范围内,可以缓和光线经过镜片的偏折程度,有效减小像差。优选地,2.06≤(R5+R6)/(R5-R6)≤5.89。
第三透镜L3的轴上厚度为d5,满足下列关系式:0.07≤d5/TTL≤0.30,规定了第三透镜L3的轴上厚度与摄像光学镜头10的光学总长TTL的比值有利于实现超薄化。优选地,0.11≤d5/TTL≤0.24。
第四透镜L4的焦距为f4,满足下列关系式:-9.84≤f4/f≤9.32,通过光焦度的合理分配,使得***具有较佳的成像品质和较低的敏感性。优选地,-6.15≤f4/f≤7.46。
第四透镜L4的轴上厚度为d7,满足下列关系式:0.05≤d7/TTL≤0.21,规定了第四透镜L4的轴上厚度与摄像光学镜头10的光学总长TTL的比值,有利于实现超薄化。优选地,0.07≤d7/TTL≤0.17。
本实施方式中,定义所述第一透镜L1与所述第二透镜L2的组合焦距为f12,满足下列关系式:1.35≤f12/f≤5.22,在条件式范围内,可消除所述摄像光学镜头10的像差与歪曲,且可压制摄像光学镜头10后焦距,维持影像镜片***组小型化。优选的,2.17≤f12/f≤4.18。
本实施方式中,摄像光学镜头10的光圈F数小于或等于1.15。大光圈, 成像性能好。优选地,光圈F数小于或等于1.13。
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、材料以及各透镜的轴上厚度等,并因此校正了各类像差,实现了在具有良好光学成像性能的同时,满足大光圈、广角化、超薄化的设计要求。
此外,本申请的摄像光学镜头为TOF(Time of flight)接受端镜头,TOF技术原理为发射端镜头发射红外面光源,照射到物体反射回来,接受端镜头接受反射回来的红外光信息,此过程实现了3D识别过程。本申请的摄像光学镜头的工作波段范围为920nm-960nm。
TTL:光学总长(第1透镜L1的物侧面到成像面的轴上距离),单位为mm。
图1是第一实施方式中摄像光学镜头10的结构示意图。
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。表1列出了本发明第一实施方式中构成摄像光学镜头10的第一透镜L1~第四透镜L4的物侧以及像侧曲率半径R、透镜的中心厚度、透镜间的距离d、折射率nd及阿贝数vd。表2示出了摄像光学镜头10的圆锥系数k与非球面系数。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】
上表中各符号的含义如下。
R:光学面的曲率半径、透镜时为中心曲率半径;
S1:光圈;
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:玻璃平板GF的物侧面的曲率半径;
R10:玻璃平板GF的像侧面的曲率半径;
d:透镜的轴上厚度或相邻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的像侧面到光学过滤片GF的物侧面的轴上距离;
d9:玻璃平板GF的轴上厚度;
d10:玻璃平板GF的像侧面到像面Si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;
ndg:玻璃平板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;
vg:玻璃平板GF的阿贝数。
表2示出了本发明第一实施方式提供的摄像光学镜头10的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是非球面系数。
IH:像高
y=(x2/R)/{1+[1-(1+k)(x2/R2)]
1/2}+A4x
4+A6x
6+A8x
8+A10x
10+A12x
12+A14x
14+A16x
16 (6)
需要说明的是,本实施方式中各透镜的非球面优选的使用下述条件式 (6)所示的非球面,但是,下述条件式(6)的具体形式仅为一个示例,实际上,并不限于条件式(6)中表示的非球面多项式形式。
表3、表4示出本发明实施例的摄像光学镜头10中各透镜的反曲点以及驻点设计数据。其中,P1R1、P2R2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。“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 | |
P1R1 | 1 | 0.775 | |
P1R2 | 1 | 0.535 | |
P2R1 | 2 | 0.325 | 0.715 |
P2R2 | 2 | 0.265 | 0.715 |
P3R1 | 2 | 0.555 | 0.825 |
P3R2 | 2 | 0.635 | 0.915 |
P4R1 | 2 | 0.395 | 1.065 |
P4R2 | 2 | 0.435 | 1.265 |
【表4】
驻点个数 | 驻点位置1 | 驻点位置2 | |
P1R1 | 0 | ||
P1R2 | 1 | 0.715 | |
P2R1 | 1 | 0.485 | |
P2R2 | 2 | 0.375 | 0.805 |
P3R1 | 1 | 0.755 | |
P3R2 | 0 | ||
P4R1 | 2 | 0.835 | 1.195 |
P4R2 | 1 | 0.975 |
图2示出了,波长为940nm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2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13示出了各实例1、2、3中各种数值与条件式中已规定的参数所对应的值。
如表13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10的入瞳直径为1.650mm,全视场像高为1.500mm,对角线方向的视场角为77.80°,光圈F数为1.136,大光圈、广角、超薄,且具有优秀的光学特征。
(第二实施方式)
图3是第二实施方式中摄像光学镜头20的结构示意图,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示出了本发明第二实施方式的摄像光学镜头20的各透镜的非球面数据。
【表6】
表7、表8示出本发明实施例的摄像光学镜头20中各透镜的反曲点以及驻点设计数据。
【表7】
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 | 0.695 | ||
P1R2 | 1 | 0.455 | ||
P2R1 | 3 | 0.185 | 0.695 | 0.745 |
P2R2 | 1 | 0.765 | ||
P3R1 | 2 | 0.585 | 0.815 | |
P3R2 | 2 | 0.765 | 0.865 | |
P4R1 | 1 | 0.435 | ||
P4R2 | 1 | 0.445 |
【表8】
驻点个数 | 驻点位置1 | |
P1R1 | 0 | |
P1R2 | 1 | 0.635 |
P2R1 | 1 | 0.305 |
P2R2 | 1 | 0.865 |
P3R1 | 0 | |
P3R2 | 0 | |
P4R1 | 1 | 0.865 |
P4R2 | 1 | 1.105 |
图4则示出了波长为940nm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。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13示出了各实例1、2、3中各种数值与条件式中已规定的参数所对应的值。
如表13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20的入瞳直径为1.491mm,全视场像高为1.500mm,对角线方向的视场角为79.80°,光圈F数为1.150,大光圈、广角、超薄,且具有优秀的光学特征。
(第三实施方式)
图5是第三实施方式中摄像光学镜头30的结构示意图,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示出了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示出了本发明第三实施方式的摄像光学镜头30的各透镜的非球面数据。
【表10】
表11、表12示出本发明实施例的摄像光学镜头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 | 反曲点位置3 | 反曲点位置4 | |
P1R1 | 0 | ||||
P1R2 | 1 | 0.625 | |||
P2R1 | 2 | 0.295 | 0.755 | ||
P2R2 | 2 | 0.165 | 0.755 | ||
P3R1 | 4 | 0.575 | 0.845 | 0.885 | 1.315 |
P3R2 | 2 | 0.665 | 0.855 | ||
P4R1 | 2 | 0.305 | 1.035 | ||
P4R2 | 2 | 0.395 | 1.265 |
【表12】
驻点个数 | 驻点位置1 | 驻点位置2 | |
P1R1 | 0 | ||
P1R2 | 0 | ||
P2R1 | 1 | 0.445 | |
P2R2 | 2 | 0.315 | 0.845 |
P3R1 | 2 | 0.935 | 1.385 |
P3R2 | 0 | ||
P4R1 | 2 | 0.775 | 1.165 |
P4R2 | 1 | 1.085 |
图6示出了波长为940nm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。图6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13示出了各实例1、2、3中各种数值与条件式中已规定的参数所对应的值。
如表13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30的入瞳直径为1.650mm,全视场像高为1.500mm,对角线方向的视场角为77.40°,光圈F数为0.995,大光圈、广角、超薄,且具有优秀的光学特征。
以下表13按照上述条件式列出了第一实施方式、第二实施方式和第三实施方式中对应各条件式的数值,以及其他相关参数的取值。
【表13】
参数及条件式 | 实施例1 | 实施例2 | 实施例3 |
f2/f | 2.600 | 4.117 | 4.899 |
d5/d6 | 15.233 | 19.935 | 24.882 |
d1/f | 0.250 | 0.266 | 0.462 |
(R7+R8)/(R7-R8) | 7.452 | 3.403 | 14.846 |
FNO | 1.136 | 1.150 | 0.995 |
f | 1.875 | 1.714 | 1.641 |
f1 | 4.922 | 3.980 | 5.158 |
f2 | 4.875 | 7.057 | 8.039 |
f3 | 2.934 | 1.449 | 3.117 |
f4 | -9.225 | -2.404 | 10.201 |
f12 | 2.707 | 2.764 | 3.483 |
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 (10)
- 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:具有正屈折力的第一透镜,具有正屈折力的第二透镜,具有正屈折力的第三透镜,以及第四透镜;所述摄像光学镜头整体的焦距为f,所述第二透镜的焦距为f2,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,所述第一透镜的轴上厚度为d1,所述第三透镜的轴上厚度为d5,所述第三透镜的像侧面到所述第四透镜的物侧面的轴上距离为d6,且满足下列关系式:2.50≤f2/f≤5.00;12.00≤d5/d6≤25.00;0.20≤d1/f≤0.50;3.00≤(R7+R8)/(R7-R8)≤15.00。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第三透镜的焦距为f3,且满足下列关系式:0.50≤f3/f≤2.00。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第一透镜物侧面的曲率半径为R1,所述第一透镜像侧面的曲率半径为R2,且满足下列关系式:-10.00≤(R1+R2)/(R1-R2)≤-3.00。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第二透镜的轴上厚度为d3,所述第二透镜的像侧面到所述第三透镜的物侧面的轴上距离为d4,且满足下列关系式:2.50≤d3/d4≤5.00。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述摄像光学镜头的光圈F数小于或等于1.15。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第一透镜的焦距为f1,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:1.16≤f1/f≤4.71;0.07≤d1/TTL≤0.38。
- 根据权利要求1所述的摄像光学镜头,其特征在于,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,所述第二透镜的轴上厚度为d3,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:-4.08≤(R3+R4)/(R3-R4)≤-0.42;0.06≤d3/TTL≤0.19。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第三透镜物侧面的曲率半径为R5,所述第三透镜像侧面的曲率半径为R6,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:1.29≤(R5+R6)/(R5-R6)≤7.36;0.07≤d5/TTL≤0.30。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第四透镜的焦距为f4,所述第四透镜的轴上厚度为d7,所述摄像光学镜头的光学总长为TTL,且满足下列关系式:-9.84≤f4/f≤9.32;0.05≤d7/TTL≤0.21。
- 根据权利要求1所述的摄像光学镜头,其特征在于,所述第一透镜与所述第二透镜的组合焦距为f12,满足下列关系式:1.35≤f12/f≤5.22。
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