CN113156615A - Eight-piece type large-aperture imaging lens - Google Patents
Eight-piece type large-aperture imaging lens Download PDFInfo
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- CN113156615A CN113156615A CN202110451728.6A CN202110451728A CN113156615A CN 113156615 A CN113156615 A CN 113156615A CN 202110451728 A CN202110451728 A CN 202110451728A CN 113156615 A CN113156615 A CN 113156615A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 141
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- 201000009310 astigmatism Diseases 0.000 description 8
- 238000005452 bending Methods 0.000 description 8
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to an eight-piece type large-aperture imaging lens which is characterized by sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side, wherein the eight-piece type large-aperture imaging lens meets the following relational expression: TTL/ImgH < 0.84; wherein, TTL is a distance from an object-side surface of the first lens element to an imaging surface at a paraxial region, and ImgH is a length of a diagonal line of an effective imaging area of the eight-lens large-aperture imaging lens. The invention has high imaging quality, light and thin volume, and large aperture and large field angle.
Description
Technical Field
The invention relates to the technical field of optical imaging lenses, in particular to an eight-piece type large-aperture imaging lens.
Background
In recent years, optical imaging lenses have been developed, and the application range of the optical imaging lenses is wider, and besides the requirement of the lenses to be light, thin, short and small, the requirements for the imaging quality of the lenses are also higher and higher. In order to improve the imaging quality, the number of optical lenses needs to be increased to modify the problems of aberration and dispersion. However, as the number of optical lenses increases, the distance from the object-side surface of the first lens element to the image plane on the optical axis increases, which is not favorable for the thinning of mobile phones, digital cameras and vehicular lenses. Therefore, it has been an object of the industry to design a multi-lens optical imaging lens with good imaging quality, light weight, small size and small size. Although the imaging quality of the existing eight-piece type imaging lens is better than that of a general five-piece type or six-piece type lens, the volume of the existing eight-piece type imaging lens is relatively large, and the requirement for thinning the lens cannot be met. In addition, the large aperture is beneficial to increasing the luminous flux, the large field angle is gradually becoming the market trend, and both the aperture and the field angle of the existing eight-piece type imaging lens cannot meet the increasing market demand.
Disclosure of Invention
The invention aims to provide an eight-piece type large-aperture imaging lens which is high in imaging quality, light and thin in volume, and has a large aperture and a large field angle.
An eight-lens large aperture imaging lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface at a paraxial region; a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region; a fourth lens element with negative refractive power having a concave object-side surface at paraxial region; a fifth lens element with negative refractive power having a concave image-side surface at paraxial region; a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region; a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region; an eighth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the eight-piece type large-aperture imaging lens meets the following relational expression: TTL/ImgH < 0.84; wherein, TTL is a distance from an object-side surface of the first lens element to an imaging surface at a paraxial region, and ImgH is a length of a diagonal line of an effective imaging area of the eight-lens large-aperture imaging lens.
In the above structure, the object-side surface of the first lens element is convex at a paraxial region thereof, so as to effectively balance low-order aberrations. The second lens element with negative refractive power can eliminate aberration generated by the first lens element. The third lens element with positive refractive power, the fourth lens element with negative refractive power, the fifth lens element with negative refractive power, the sixth lens element with positive refractive power, and the seventh lens element with positive refractive power can effectively correct paraxial spherical aberration and reduce peripheral astigmatic field curvature. The eighth lens element with negative refractive power has a concave image-side surface at a paraxial region, which helps to keep the principal point of the optical imaging system away from the image-side end, thereby effectively shortening the overall length of the optical imaging system, facilitating the miniaturization of the system, and correcting off-axis aberration to improve the peripheral imaging quality.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: ND2 ≧ 1.68, ND1 ≧ ND3 ═ ND5 ═ ND6 ═ ND 7; wherein ND1, ND2, ND3, ND5, ND6, and ND7 are refractive indices of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens, respectively. The relationship of the refractive indexes is beneficial to ensuring the imaging quality of the lens.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: -3.3< R72/R81< -2.25; wherein R72 is a radius of curvature of the image-side surface of the seventh lens element, and R81 is a radius of curvature of the object-side surface of the eighth lens element. The ratio range of the curvature radius can effectively balance astigmatism and coma aberration, so that the imaging quality of the lens is better.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: 0.22 ≦ T67/CT1< 0.26; wherein, T67 is the distance between the sixth lens and the seventh lens on the optical axis, and CT1 is the maximum thickness of the first lens on the optical axis. By controlling the ratio of the distance between the sixth lens and the seventh lens on the optical axis to the maximum thickness of the first lens on the optical axis, the distance between the lenses can be properly distributed, the total length of the camera lens is reduced, the assembly difficulty of the camera lens is reduced, and the assembly process is smooth and simple.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: 0.22< (f8-f7)/(f2-f1) < 0.34; wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, f7 is a focal length of the seventh lens, and f8 is a focal length of the eighth lens. The optical imaging lens has better aberration correction capability by controlling the focal length ratio.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: 0.65< CT1/(CT4+ CT5) ≦ 1.14; wherein CT1 is a maximum thickness of the first lens on an optical axis, CT4 is a maximum thickness of the fourth lens on the optical axis, and CT5 is a maximum thickness of the fifth lens on the optical axis. The maximum thickness ratio of the lenses is beneficial to reducing the volume of the lens and achieving the miniaturization of the lens.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: -2.88< f5/f6< -0.16; wherein f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens. The bending force of the lens can be reasonably distributed by satisfying the relational expression, and the total length of the camera lens is effectively shortened while the imaging quality is ensured.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: 0.51< f/f1< 0.84; wherein f is an effective focal length of the eight-piece large-aperture imaging lens, and f1 is a focal length of the first lens. By controlling the ratio of the effective focal length of the whole system to the focal length of the first lens, the optical focal power of the first lens can be prevented from being too large, so that the optical imaging lens has low sensitivity and good imaging quality, and has shorter optical length.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: -4.94< f4/f < -3.31; wherein f is an effective focal length of the eight-piece large-aperture imaging lens, and f4 is a focal length of the fourth lens. By controlling the ratio of the focal length of the fourth lens to the effective focal length of the whole system, the optical power of the fourth lens can be prevented from being too large, so that the optical imaging lens has low sensitivity and good imaging quality, and has shorter optical length.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: 0.08< CT5/TTL < 0.15; wherein CT5 is a maximum thickness of the fifth lens element on an optical axis, and TTL is a distance from an object-side surface of the first lens element to an image plane at a paraxial region. Satisfying the above relationship is beneficial to controlling the thickness of the fifth lens on the optical axis and reducing the sensitivity of the optical imaging lens.
Further, the eight-piece type large-aperture imaging lens meets the relational expression: f/EPD ≦ 1.48; and the EPD is the diameter of an entrance pupil, and f is the effective focal length of the eight-piece type large-aperture imaging lens. The aperture is enlarged by controlling the ratio, the light flux is increased, and a better imaging effect can be achieved.
Compared with the prior art, the invention has the beneficial effects that: the eight-piece type lens combination is adopted, and through reasonable tortuosity matching, the total length of the lens is effectively shortened while the high imaging quality of the lens is ensured, so that the lens meets the requirement of thinning. The reasonable parameter collocation among all the lenses ensures that the lens has the characteristics of large aperture and large field angle, and meets the shooting requirements of people in a low-light environment and at a wide angle.
Drawings
Fig. 1 is a schematic structural diagram of an eight-piece large-aperture imaging lens according to a first embodiment of the present invention.
Fig. 2 is a graph showing astigmatism and distortion curves of the eight-lens large-aperture imaging lens according to the first embodiment of the present invention.
Fig. 3 is a spherical aberration curve chart of the eight-piece large aperture imaging lens according to the first embodiment of the invention.
Fig. 4 is a schematic structural diagram of an eight-piece large-aperture imaging lens according to a second embodiment of the present invention.
Fig. 5 is a graph showing astigmatism and distortion curves of the eight-lens large-aperture imaging lens according to the second embodiment of the present invention.
Fig. 6 is a spherical aberration curve chart of the eight-piece large-aperture imaging lens according to the second embodiment of the invention.
Fig. 7 is a schematic structural diagram of an eight-piece large aperture imaging lens according to a third embodiment of the present invention.
Fig. 8 is a graph of astigmatism and distortion curves of the eight-piece large-aperture imaging lens according to the third embodiment of the present invention.
Fig. 9 is a spherical aberration diagram of the eight-piece large aperture imaging lens according to the third embodiment of the invention.
Fig. 10 is a schematic structural diagram of an eight-piece large-aperture imaging lens according to a fourth embodiment of the present invention.
Fig. 11 is a graph of astigmatism and distortion curves of an eight-lens large-aperture imaging lens according to a fourth embodiment of the present invention.
Fig. 12 is a spherical aberration curve chart of the eight-piece large-aperture imaging lens according to the fourth embodiment of the present invention.
Fig. 13 is a schematic structural diagram of an eight-piece large aperture imaging lens according to a fifth embodiment of the present invention.
Fig. 14 is a graph showing astigmatism and distortion curves of an eight-piece large-aperture imaging lens according to a fifth embodiment of the present invention.
Fig. 15 is a spherical aberration diagram of an eight-piece large aperture imaging lens according to a fifth embodiment of the present invention.
Fig. 16 is a schematic structural diagram of an eight-piece large-aperture imaging lens according to a sixth embodiment of the present invention.
Fig. 17 is a graph showing astigmatism and distortion curves of an eight-lens large-aperture imaging lens according to a sixth embodiment of the present invention.
Fig. 18 is a spherical aberration diagram of an eight-piece large aperture imaging lens according to a sixth embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, the object side refers to a side of the lens toward the object, and the image side refers to a side of the lens toward the imaging plane. When any point on the passing surface of the object side surface of the lens is taken as a tangent plane, the surface is always positioned at the image side of the tangent plane, and the curvature radius of the surface is positive, the object side surface of the lens is a convex surface; otherwise, the object-side surface of the lens is concave, and the curvature radius of the object-side surface is negative.
When any point on the surface passing through the image side surface of the lens is taken as a tangent plane, the surface is always positioned at the object side of the tangent plane, the curvature radius of the surface is negative, and the image side surface of the lens is a convex surface; otherwise, the surface of the image side of the lens is a concave surface, and the curvature radius of the lens is positive.
If a tangent plane is defined at any point on the object-side surface or the image-side surface of the lens, and the surface is partially on the image-side surface of the tangent plane and partially on the object-side surface of the tangent plane, the surface has an inflection point, and the above method is still applicable to the determination of the surface roughness of the object-side surface and the image-side surface at the paraxial region.
Further, the aspherical surface curve equation of each lens is expressed as follows:
wherein Z is a distance rise from an origin of the aspheric surface when the aspheric surface is at a position having a height of R along the optical axis direction, and c is a paraxial curvature of the aspheric surface (a curvature radius R is 1/c, which is an inverse of the curvature); k is a conic coefficient; ai is the ith order coefficient of the aspheric surface, and the higher order coefficients applied in the present invention are a4, a6, A8, a10, a12, a14, a16, a18, a 20.
Referring to fig. 1, in the first embodiment, the eight-piece large aperture imaging lens includes, in order from an object side to an image side, a stop 10, a first lens element 11, a second lens element 12, a third lens element 13, a fourth lens element 14, a fifth lens element 15, a sixth lens element 16, a seventh lens element 17, an eighth lens element 18, and a filter 19. A distance is provided between two adjacent lenses, and no relative movement exists between the lenses, and the object-side surface and the image-side surface of the first lens element 11, the second lens element 12, the third lens element 13, the fourth lens element 14, the fifth lens element 15, the sixth lens element 16, the seventh lens element 17, and the eighth lens element 18 are aspheric.
Specifically, the first lens element 11 with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the second lens element 12 with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the third lens element 13 with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fourth lens element 14 with negative refractive power has a concave object-side surface at a paraxial region, and has a convex or concave image-side surface at a paraxial region; the fifth lens element 15 with negative refractive power has a concave image-side surface at a paraxial region, and an object-side surface thereof which is concave or convex at a paraxial region; the sixth lens element 16 with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the seventh lens element 17 with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the eighth lens element 18 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
In the above structure, the object-side surface of the first lens element 11 is convex at a paraxial region and the image-side surface thereof is concave at a paraxial region, so that low-order aberrations can be effectively balanced. The second lens element 12 with negative refractive power is favorable for eliminating the aberration generated by the first lens element 11. The third lens element 13 with positive refractive power, the fourth lens element 14 with negative refractive power, the fifth lens element 15 with negative refractive power, the sixth lens element 16 with positive refractive power, and the seventh lens element 17 with positive refractive power can effectively correct paraxial spherical aberration and reduce peripheral astigmatic field curvature. The eighth lens element 18 with negative refractive power has a concave image-side surface at a paraxial region, which helps to keep the main point of the optical imaging system away from the image-side end, thereby effectively shortening the overall length of the optical imaging system, facilitating the miniaturization of the system, and correcting off-axis aberration to improve the peripheral imaging quality.
The eight-piece type large-aperture imaging lens meets the following conditions: TTL/ImgH <0.84, wherein TTL is the distance from the object side surface of the first lens element 11 to the imaging surface at the paraxial region, and ImgH is the length of the diagonal line of the effective imaging area of the eight-piece type large-aperture imaging lens. The optical imaging lens can be ensured to have the characteristics of large image plane and thinning by controlling the ratio of TTL/ImgH.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: ND2 ≧ 1.68, ND1 ≧ ND3 ═ ND5 ═ ND6 ═ ND 7; here, ND1, ND2, ND3, ND5, ND6, and ND7 are refractive indices of the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively. The relationship of the refractive indexes is beneficial to ensuring the imaging quality of the lens.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: -3.3< R72/R81< -2.25; where R72 is a radius of curvature of the image-side surface of the seventh lens element 17, and R81 is a radius of curvature of the object-side surface of the eighth lens element 18. The ratio range of the curvature radius can effectively balance astigmatism and coma aberration, so that the imaging quality of the lens is better.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: 0.22 ≦ T67/CT1< 0.26; where T67 is the distance between the sixth lens 16 and the seventh lens 17 on the optical axis, and CT1 is the maximum thickness of the first lens 11 on the optical axis. By controlling the ratio of the distance between the sixth lens 16 and the seventh lens 17 on the optical axis to the maximum thickness of the first lens 11 on the optical axis, the distance between the lenses can be properly distributed, the total length of the camera lens is reduced, the assembly difficulty of the camera lens is reduced, and the assembly process is smooth and simple.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: 0.22< (f8-f7)/(f2-f1) < 0.34; where f1 is the focal length of the first lens 11, f2 is the focal length of the second lens 12, f7 is the focal length of the seventh lens 17, and f8 is the focal length of the eighth lens 18. The optical imaging lens has better aberration correction capability by controlling the focal length ratio.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: 0.65< CT1/(CT4+ CT5) ≦ 1.14; where CT1 is the maximum thickness of the first lens 11 on the optical axis, CT4 is the maximum thickness of the fourth lens 14 on the optical axis, and CT5 is the maximum thickness of the fifth lens 15 on the optical axis. The maximum thickness ratio of the lenses is beneficial to reducing the volume of the lens and achieving the miniaturization of the lens.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: -2.88< f5/f6< -0.16; where f5 is the focal length of the fifth lens 15, and f6 is the focal length of the sixth lens 16. The bending force of the lens can be reasonably distributed by satisfying the relational expression, and the total length of the camera lens is effectively shortened while the imaging quality is ensured.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: 0.51< f/f1< 0.84; where f is the effective focal length of the eight-piece large-aperture imaging lens, and f1 is the focal length of the first lens element 11. By controlling the ratio of the effective focal length of the whole system to the focal length of the first lens 11, the optical power of the first lens 11 can be prevented from being too large, so that the optical imaging lens has low sensitivity and good imaging quality, and has shorter optical length.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: -4.94< f4/f < -3.31; where f is the effective focal length of the eight-piece large-aperture imaging lens, and f4 is the focal length of the fourth lens element 14. By controlling the ratio of the focal length of the fourth lens 14 to the effective focal length of the whole system, the optical power of the fourth lens 14 can be prevented from being too large, so that the optical imaging lens has low sensitivity and good imaging quality, and has shorter optical length.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: 0.08< CT5/TTL < 0.15; where CT5 is the maximum thickness of the fifth lens element 15 on the optical axis, and TTL is the distance from the object-side surface of the first lens element 11 to the image plane at the paraxial region. Satisfying the above relationship is advantageous for controlling the thickness of the fifth lens 15 on the optical axis, and is advantageous for reducing the sensitivity of the optical imaging lens.
Preferably, the eight-piece large-aperture imaging lens satisfies the following relation: f/EPD ≦ 1.48; the EPD is the diameter of an entrance pupil, and f is the effective focal length of the eight-piece type large-aperture imaging lens. The aperture is enlarged by controlling the ratio, the light flux is increased, and a better imaging effect can be achieved.
The eight-piece large-aperture imaging lens of the present invention will be described in detail with reference to the following embodiments and accompanying drawings.
First embodiment
Referring to fig. 2 and 3, in the first embodiment, the eight-piece large-aperture imaging lens satisfies tables 1-1, 1-2, and 1-3.
Table 1-1 shows basic parameters of the eight-piece large-aperture imaging lens of the first embodiment:
tables 1 to 2 show aspherical coefficients of the respective lenses in the first embodiment:
tables 1 to 3 are values of the respective conditional expressions in the first embodiment:
second embodiment
With reference to fig. 4 to 6, the eight-piece large aperture imaging lens of the embodiment includes, in order from an object side to an image side, a first lens element 21, a second lens element 22, a third lens element 23, a fourth lens element 24, a fifth lens element 25, a sixth lens element 26, a seventh lens element 27, and an eighth lens element 28. In a specific implementation, the aperture stop 20 is disposed on the object-side surface of the first lens element 21, and the filter 29 is disposed on the image-side surface of the eighth lens element 28.
It should be understood that the eight-piece large aperture imaging lens in the second embodiment satisfies the bending force, the surface irregularity, and the expressions in the first embodiment, which are not described herein again.
In the second embodiment, the eight-piece large-aperture imaging lens satisfies tables 2-1, 2-2, and 2-3.
Table 2-1 shows basic parameters of the eight-piece large-aperture imaging lens of the second embodiment:
table 2-2 shows aspheric coefficients of the respective lenses in the second embodiment:
tables 2 to 3 are values of the respective conditional expressions in the second embodiment:
third embodiment
With reference to fig. 7 to 9, the eight-piece large aperture imaging lens of the embodiment includes, in order from an object side to an image side, a first lens element 31, a second lens element 32, a third lens element 33, a fourth lens element 34, a fifth lens element 35, a sixth lens element 36, a seventh lens element 37 and an eighth lens element 38. In a specific implementation, the stop 30 is disposed on the object-side surface of the first lens element 31, and the filter 39 is disposed on the image-side surface of the eighth lens element 38.
It should be understood that the eight-piece large aperture imaging lens in the third embodiment satisfies the bending force, the surface irregularity, and the expressions in the first embodiment, which are not described herein again.
In the third embodiment, the eight-piece large-aperture imaging lens satisfies tables 3-1, 3-2, and 3-3.
Table 3-1 shows basic parameters of the eight-piece large-aperture imaging lens of the third embodiment:
table 3-2 shows aspheric coefficients of the respective lenses in the third embodiment:
tables 3 to 3 are values of the respective conditional expressions in the third embodiment:
fourth embodiment
With reference to fig. 10 to 12, the eight-piece large aperture imaging lens of the embodiment includes, in order from an object side to an image side, a first lens 41, a second lens 42, a third lens 43, a fourth lens 44, a fifth lens 45, a sixth lens 46, a seventh lens 47, and an eighth lens 48. In a specific implementation, the stop 40 is disposed on the object-side surface of the first lens element 41, and the filter 49 is disposed on the image-side surface of the eighth lens element 48.
It should be understood that the eight-piece large aperture imaging lens in the fourth embodiment satisfies the bending force, the surface irregularity, and the expressions in the first embodiment, which are not described herein again.
In the fourth embodiment, the eight-piece large-aperture imaging lens satisfies tables 4-1, 4-2, and 4-3.
Table 4-1 shows basic parameters of the eight-piece large-aperture imaging lens of the fourth embodiment:
table 4-2 shows aspheric coefficients of the respective lenses in the fourth embodiment:
tables 4 to 3 are values of the respective conditional expressions in the fourth embodiment:
fifth embodiment
With reference to fig. 13 to 15, the eight-piece large aperture imaging lens of the embodiment includes, in order from an object side to an image side, a first lens element 51, a second lens element 52, a third lens element 53, a fourth lens element 54, a fifth lens element 55, a sixth lens element 56, a seventh lens element 57, and an eighth lens element 58. In a specific implementation, the stop 50 is disposed on the object-side surface of the first lens element 51, and the filter 59 is disposed on the image-side surface of the eighth lens element 58.
It should be understood that the eight-piece large aperture imaging lens in the fifth embodiment satisfies the bending force, the surface irregularity, and the expressions in the first embodiment, which are not described herein again.
In the fifth embodiment, the eight-piece large-aperture imaging lens satisfies tables 5-1, 5-2, and 5-3.
Table 5-1 shows basic parameters of the eight-piece large-aperture imaging lens of the fifth embodiment:
table 5-2 shows aspheric coefficients of the respective lenses in the fifth embodiment:
tables 5 to 3 are values of the respective conditional expressions in the fifth embodiment:
sixth embodiment
With reference to fig. 16 to 18, the eight-piece large aperture imaging lens of the embodiment includes, in order from an object side to an image side, a first lens element 61, a second lens element 62, a third lens element 63, a fourth lens element 64, a fifth lens element 65, a sixth lens element 66, a seventh lens element 67, and an eighth lens element 68. In a specific implementation, the aperture stop 60 is disposed on the object-side surface of the first lens element 61, and the filter 69 is disposed on the image-side surface of the eighth lens element 68.
It should be understood that the eight-piece large aperture imaging lens in the sixth embodiment satisfies the bending force, the surface irregularity, and the expressions in the first embodiment described above, and details thereof are not described here.
In the sixth embodiment, the eight-piece large-aperture imaging lens satisfies tables 6-1, 6-2, and 6-3.
Table 6-1 shows basic parameters of the eight-piece large-aperture imaging lens of the sixth embodiment:
table 6-2 shows aspheric coefficients of the respective lenses in the sixth embodiment:
tables 6 to 3 are values of the respective conditional expressions in the sixth embodiment:
to facilitate comparison of the six examples, the following table summarizes the values obtained by the expressions under the corresponding conditions of the examples:
the eight-piece type large-aperture imaging lens in the embodiment effectively shortens the total length of the lens by reasonable matching of the bending force while ensuring the high imaging quality of the lens, so that the lens meets the requirement of thinning. The reasonable parameter collocation among all the lenses ensures that the lens has the characteristics of large aperture and large field angle, and meets the shooting requirements of people in a low-light environment and at a wide angle.
In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.
Claims (11)
1. An eight-lens large aperture imaging lens, in order from an object side to an image side, comprising:
a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface at a paraxial region;
a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region;
a fourth lens element with negative refractive power having a concave object-side surface at paraxial region;
a fifth lens element with negative refractive power having a concave image-side surface at paraxial region;
a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region;
a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface at a paraxial region;
an eighth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the eight-piece type large-aperture imaging lens meets the following relational expression: TTL/ImgH < 0.84; wherein, TTL is a distance from an object-side surface of the first lens element to an imaging surface at a paraxial region, and ImgH is a length of a diagonal line of an effective imaging area of the eight-lens large-aperture imaging lens.
2. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: ND2 ≧ 1.68, ND1 ≧ ND3 ═ ND5 ═ ND6 ═ ND 7; wherein ND1, ND2, ND3, ND5, ND6, and ND7 are refractive indices of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens, respectively.
3. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: -3.3< R72/R81< -2.25; wherein R72 is a radius of curvature of the image-side surface of the seventh lens element, and R81 is a radius of curvature of the object-side surface of the eighth lens element.
4. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: 0.22 ≦ T67/CT1< 0.26; wherein, T67 is the distance between the sixth lens and the seventh lens on the optical axis, and CT1 is the maximum thickness of the first lens on the optical axis.
5. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: 0.22< (f8-f7)/(f2-f1) < 0.34; wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, f7 is a focal length of the seventh lens, and f8 is a focal length of the eighth lens.
6. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: 0.65< CT1/(CT4+ CT5) ≦ 1.14; wherein CT1 is a maximum thickness of the first lens on an optical axis, CT4 is a maximum thickness of the fourth lens on the optical axis, and CT5 is a maximum thickness of the fifth lens on the optical axis.
7. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: -2.88< f5/f6< -0.16; wherein f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
8. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: 0.51< f/f1< 0.84; wherein f is an effective focal length of the eight-piece large-aperture imaging lens, and f1 is a focal length of the first lens.
9. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: -4.94< f4/f < -3.31; wherein f is an effective focal length of the eight-piece large-aperture imaging lens, and f4 is a focal length of the fourth lens.
10. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: 0.08< CT5/TTL < 0.15; wherein CT5 is a maximum thickness of the fifth lens element on an optical axis, and TTL is a distance from an object-side surface of the first lens element to an image plane at a paraxial region.
11. The eight-piece large-aperture imaging lens according to claim 1, wherein the eight-piece large-aperture imaging lens satisfies the relation: f/EPD ≦ 1.48; and the EPD is the diameter of an entrance pupil, and f is the effective focal length of the eight-piece type large-aperture imaging lens.
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| CN202110451728.6A CN113156615A (en) | 2021-04-26 | 2021-04-26 | Eight-piece type large-aperture imaging lens |
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| CN202110451728.6A CN113156615A (en) | 2021-04-26 | 2021-04-26 | Eight-piece type large-aperture imaging lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI847092B (en) * | 2021-12-28 | 2024-07-01 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149667A (en) * | 2013-01-31 | 2013-06-12 | 浙江大立科技股份有限公司 | Compact type medium wave infrared dual-viewing-field optical system |
| WO2016104786A1 (en) * | 2014-12-26 | 2016-06-30 | 株式会社ニコン | Variable magnification optical system, optical device, and method for producing variable magnification optical system |
| CN107703608A (en) * | 2017-11-22 | 2018-02-16 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107703609A (en) * | 2017-11-22 | 2018-02-16 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107741630A (en) * | 2017-11-22 | 2018-02-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107831588A (en) * | 2017-11-29 | 2018-03-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108445610A (en) * | 2018-06-05 | 2018-08-24 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN108646394A (en) * | 2018-07-26 | 2018-10-12 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108681040A (en) * | 2018-08-02 | 2018-10-19 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN108873272A (en) * | 2018-08-02 | 2018-11-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108919464A (en) * | 2018-08-06 | 2018-11-30 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN109343203A (en) * | 2018-11-27 | 2019-02-15 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| CN109541781A (en) * | 2018-07-20 | 2019-03-29 | 瑞声声学科技(深圳)有限公司 | Pick-up lens |
| CN110068915A (en) * | 2019-05-10 | 2019-07-30 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN110531503A (en) * | 2019-10-10 | 2019-12-03 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110850559A (en) * | 2019-12-20 | 2020-02-28 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN110927931A (en) * | 2019-12-20 | 2020-03-27 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| US20200271898A1 (en) * | 2019-02-26 | 2020-08-27 | Kantatsu Co., Ltd. | Imaging lens |
| CN211478747U (en) * | 2019-09-03 | 2020-09-11 | 康达智株式会社 | Camera lens |
| CN113552697A (en) * | 2021-07-19 | 2021-10-26 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
-
2021
- 2021-04-26 CN CN202110451728.6A patent/CN113156615A/en active Pending
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149667A (en) * | 2013-01-31 | 2013-06-12 | 浙江大立科技股份有限公司 | Compact type medium wave infrared dual-viewing-field optical system |
| WO2016104786A1 (en) * | 2014-12-26 | 2016-06-30 | 株式会社ニコン | Variable magnification optical system, optical device, and method for producing variable magnification optical system |
| CN107703608A (en) * | 2017-11-22 | 2018-02-16 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107703609A (en) * | 2017-11-22 | 2018-02-16 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107741630A (en) * | 2017-11-22 | 2018-02-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN107831588A (en) * | 2017-11-29 | 2018-03-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108445610A (en) * | 2018-06-05 | 2018-08-24 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN109541781A (en) * | 2018-07-20 | 2019-03-29 | 瑞声声学科技(深圳)有限公司 | Pick-up lens |
| CN108646394A (en) * | 2018-07-26 | 2018-10-12 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108681040A (en) * | 2018-08-02 | 2018-10-19 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN108873272A (en) * | 2018-08-02 | 2018-11-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108919464A (en) * | 2018-08-06 | 2018-11-30 | 浙江舜宇光学有限公司 | Optical imagery eyeglass group |
| CN109343203A (en) * | 2018-11-27 | 2019-02-15 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| US20200271898A1 (en) * | 2019-02-26 | 2020-08-27 | Kantatsu Co., Ltd. | Imaging lens |
| CN110068915A (en) * | 2019-05-10 | 2019-07-30 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN211478747U (en) * | 2019-09-03 | 2020-09-11 | 康达智株式会社 | Camera lens |
| CN110531503A (en) * | 2019-10-10 | 2019-12-03 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110850559A (en) * | 2019-12-20 | 2020-02-28 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN110927931A (en) * | 2019-12-20 | 2020-03-27 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN113552697A (en) * | 2021-07-19 | 2021-10-26 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI847092B (en) * | 2021-12-28 | 2024-07-01 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
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