CN113253437B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN113253437B CN113253437B CN202110803653.3A CN202110803653A CN113253437B CN 113253437 B CN113253437 B CN 113253437B CN 202110803653 A CN202110803653 A CN 202110803653A CN 113253437 B CN113253437 B CN 113253437B
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a diaphragm; the first lens with positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; a second lens element having a negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave; a third lens element having a positive optical power, the object side surface being convex at a paraxial region and the image side surface being concave at a paraxial region; a fourth lens having a negative optical power, the image side surface being concave at the paraxial region; a fifth lens element with positive optical power having a convex object-side surface at paraxial region and a convex image-side surface; a sixth lens element with negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave at the paraxial region. The optical lens of this application structure is compacter when satisfying high pixel, increases the luminous flux that gets into the camera lens simultaneously, possesses the effect of big light ring, makes the product possess big light ring, high pixel, miniaturized characteristics simultaneously.
Description
Technical Field
The invention relates to the technical field of lens imaging, in particular to an optical lens.
Background
At present, along with the popularization of portable electronic devices (such as smart phones, tablets and cameras), and the popularity of social, video and live broadcast software, people have higher and higher liking degree for photography, camera lenses have become standard fittings of the electronic devices, and even the camera lenses have become indexes which are considered for the first time when consumers purchase the electronic devices.
With the development of mobile information technology, portable electronic devices such as mobile phones have been developed toward ultra-thin, ultra-high definition, and day and night with the same image quality, and in particular, close-up of human images, still images, macro photography, and star and sky photography all need to have a large aperture characteristic to play a role, which is a focus of attention when buying mobile phones. The lightness, thinness and high pixel are the main selling points of the mobile phone for updating. Therefore, demands for a large aperture, an ultra-high pixel, and a thin and light structure have been made.
Disclosure of Invention
Based on this, the present invention provides an optical lens, which has at least the features of super-high pixel, large aperture and super-thin.
An embodiment of the present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: a diaphragm; the first lens with positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; a second lens element having a negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave; a third lens element having a positive optical power, the object side surface being convex at a paraxial region and the image side surface being concave at a paraxial region; a fourth lens having a negative optical power, the image side surface being concave at the paraxial region; a fifth lens element with positive optical power having a convex object-side surface at paraxial region and a convex image-side surface; a sixth lens element with negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave at the paraxial region.
In some embodiments, the effective focal length f of the optical lens and the maximum half field angle Semi-FOV of the optical lens satisfy the following conditional expression: 4.5mm < f × tan (Semi-FOV) < 5.5 mm.
In some embodiments, the following conditional expression is satisfied by a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the optical lens and a distance TTL on an optical axis from an object side surface of the first lens to the imaging surface: TTL/ImgH is more than 1.25 and less than 1.40.
In some embodiments, the radius of curvature R41 of the object-side surface of the fourth lens and the radius of curvature R42 of the image-side surface of the fourth lens satisfy the following conditional expression: 0 < (R41 + R42)/(R41-R42) < 20.
In some embodiments, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy the following conditional expression: f123/f is more than 1.0 and less than 1.3.
In some embodiments, the combined focal length f456 of the fourth, fifth, and sixth lenses and the effective focal length f of the optical lens satisfy the following conditional expression: -4 < f456/f < 0.
In some embodiments, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy the following conditional expression: -1 < (ET 4-CT 4)/CT 4 < 0.
In some embodiments, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the separation distance T34 of the third lens and the fourth lens on the optical axis satisfy the following conditional expression: 1.0 < (CT 3+ CT 4)/T34 < 2.0.
In some embodiments, the object side surface of the fourth lens is concave.
In some embodiments, the object-side surface of the fourth lens is convex at the paraxial region.
In some embodiments, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are all plastic aspheric lens elements.
Compared with the prior art, the optical lens provided by the invention adopts six lenses with specific refractive power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while high pixel is satisfied, meanwhile, the luminous flux entering the lens is increased, the effect of large aperture is achieved, and the product has the characteristics of large aperture, high pixel and miniaturization.
Drawings
FIG. 1 is a schematic structural diagram of an optical lens system according to a first embodiment of the present invention;
FIG. 2 is a field curvature graph of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a distortion curve of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating axial chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 7 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a distortion graph of an optical lens in a second embodiment of the present invention;
FIG. 9 is a graph of axial chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 10 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 11 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;
FIG. 12 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 13 is a distortion graph of an optical lens in a third embodiment of the present invention;
FIG. 14 is a graph illustrating axial chromatic aberration of an optical lens according to a third embodiment of the present invention;
FIG. 15 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;
FIG. 16 is a schematic structural diagram of an optical lens system according to a fourth embodiment of the present invention;
fig. 17 is a field curvature graph of an optical lens in a fourth embodiment of the present invention;
fig. 18 is a distortion graph of an optical lens in a fourth embodiment of the present invention;
FIG. 19 is a graph showing axial chromatic aberration of an optical lens according to a fourth embodiment of the present invention;
FIG. 20 is a vertical axis chromatic aberration diagram of an optical lens according to a fourth embodiment of the present invention;
FIG. 21 is a schematic structural diagram of an optical lens system according to a fifth embodiment of the present invention;
fig. 22 is a field curvature graph of an optical lens in a fifth embodiment of the present invention;
fig. 23 is a distortion graph of an optical lens in a fifth embodiment of the present invention;
FIG. 24 is a graph showing axial chromatic aberration of an optical lens according to a fifth embodiment of the present invention;
FIG. 25 is a vertical axis chromatic aberration diagram of an optical lens according to a fifth embodiment of the present invention;
fig. 26 is a schematic structural diagram of an optical lens system according to a sixth embodiment of the present invention;
fig. 27 is a field curvature graph of an optical lens in a sixth embodiment of the present invention;
fig. 28 is a distortion graph of an optical lens in a sixth embodiment of the present invention;
fig. 29 is a graph showing an axial chromatic aberration of an optical lens in a sixth embodiment of the present invention;
FIG. 30 is a vertical axis chromatic aberration diagram of an optical lens according to a sixth embodiment of the present invention;
FIG. 31 is a schematic structural diagram of an optical lens system according to a seventh embodiment of the present invention;
fig. 32 is a field curvature graph of an optical lens in a seventh embodiment of the present invention;
fig. 33 is a distortion graph of an optical lens in a seventh embodiment of the present invention;
fig. 34 is a graph showing an axial chromatic aberration of an optical lens in a seventh embodiment of the present invention;
fig. 35 is a vertical axis chromatic aberration diagram of an optical lens according to a seventh embodiment of the present invention.
Description of the main element symbols:
| first lens | L1 | Second lens | L2 |
| Third lens | L3 | Fourth lens | L4 |
| Fifth lens element | L5 | Sixth lens element | L6 |
| Infrared filter | G1 | Diaphragm | ST |
| Object side surface of the first lens | S1 | Image side surface of the first lens | S2 |
| Object side surface of the second lens | S3 | Image side surface of the second lens | S4 |
| Object side of the third lens | S5 | Image side surface of the third lens | S6 |
| Object side of the fourth lens | S7 | Image side surface of the fourth lens | S8 |
| Object side surface of fifth lens | S9 | Image side surface of the fifth lens element | S10 |
| Object side surface of sixth lens | S11 | Image side surface of sixth lens element | S12 |
| Object side of infrared filter | S13 | Image side of infrared filter | S14 |
| Image plane | S15 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented 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. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An embodiment of the present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: a diaphragm; the first lens with positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; a second lens element having a negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave; a third lens element having a positive optical power, the object side surface being convex at a paraxial region and the image side surface being concave at a paraxial region; a fourth lens having a negative optical power, the image side surface being concave at the paraxial region; a fifth lens element with positive optical power having a convex object-side surface at paraxial region and a convex image-side surface; a sixth lens element with negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave at the paraxial region.
In some embodiments, the effective focal length f of the optical lens and the maximum half field angle Semi-FOV of the optical lens satisfy the following conditional expression: 4.5mm < f × tan (Semi-FOV) < 5.5 mm. The size of the imaging chip of the optical lens is favorably determined by controlling the size relation between the focal length of the optical lens and the field angle.
In some embodiments, the following conditional expression is satisfied by the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical lens and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens: TTL/ImgH is more than 1.25 and less than 1.40. Satisfying the above conditional expressions is advantageous for making the optical lens have characteristics such as ultra-thin and miniaturization.
In some embodiments, the radius of curvature R41 of the object-side surface of the fourth lens and the radius of curvature R42 of the image-side surface of the fourth lens satisfy the following conditional expression: 0 < (R41 + R42)/(R41-R42) < 20. The shape of the fourth lens can be effectively controlled, so that the incident angle of imaging light at the fourth lens is kept in a reasonable range, and the optical lens is better matched with the imaging chip.
In some embodiments, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy the following conditional expression: f123/f is more than 1.0 and less than 1.3. The astigmatism contributions of the object side surface of the first lens and the image side surface of the third lens can be effectively controlled, and further the image quality in the central field aperture band of the optical lens can be effectively controlled.
In some embodiments, the combined focal length f456 of the fourth, fifth, and sixth lenses and the effective focal length f of the optical lens satisfy the following conditional expression: -4 < f456/f < 0. The aberration generated by the first lens, the second lens and the third lens can be effectively corrected, and meanwhile, the back focal length of the optical lens can be shortened, and the total length of the optical lens can be shortened.
In some embodiments, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy the following conditional expression: -1 < (ET 4-CT 4)/CT 4 < 0. The shape and thickness ratio of the fourth lens can be effectively controlled, so that the molding difficulty of the lens is reduced.
In some embodiments, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the separation distance T34 of the third lens and the fourth lens on the optical axis satisfy the following conditional expression: 1.0 < (CT 3+ CT 4)/T34 < 2.0. The on-axis distance between the third lens and the fourth lens and the central thickness of the third lens and the fourth lens are reasonably controlled, and the distortion contribution amount is favorably controlled within a reasonable range.
In some embodiments, the object side surface of the fourth lens is concave.
In some embodiments, the object-side surface of the fourth lens is convex at the paraxial region.
In some embodiments, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are all plastic aspheric lens elements. Each lens adopts an aspheric lens, and the aspheric lens at least has the following three advantages:
1. the lens has better imaging quality;
2. the structure of the lens is more compact;
3. the total optical length of the lens is shorter.
The surface shape of the aspheric lens in each embodiment of the invention satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A2iIs the aspheric surface type coefficient of 2i order.
In the following embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables of the embodiments.
First embodiment
Referring to fig. 1, an optical lens assembly according to a first embodiment of the present invention includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is concave, and the image-side surface S8 is concave at paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens provided by the embodiment are shown in table 1, where R represents a curvature radius, d represents an optical surface distance, and n representsdRepresenting the refractive index, V, of the materialdRepresents the abbe number of the material.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 2.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical lens are shown in fig. 2, 3, 4, and 5, respectively.
The field curvature curve in fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis indicates the amount of displacement (unit: mm), and the vertical axis indicates the angle of view (unit: degree). As can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.3 mm, which indicates that the field curvature of the optical lens is better corrected;
the distortion curve in fig. 3 represents f-tan θ distortion at different image heights on the image forming plane, the abscissa represents f-tan θ distortion, and the ordinate represents the angle of view (unit: degree). As can be seen from fig. 3, the optical distortion at different image heights on the imaging surface is controlled within ± 3%, which indicates that the distortion of the optical lens is well corrected;
the axial chromatic aberration curve of fig. 4 represents the aberration on the optical axis at the imaging plane, the horizontal axis represents the axial chromatic aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from fig. 4, the offset of the axial chromatic aberration is controlled within ± 0.04 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
the vertical axis chromatic aberration in fig. 5 indicates a chromatic aberration at different image heights on the image forming plane for each wavelength with respect to the center wavelength (0.55 μm), the horizontal axis indicates a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis indicates a normalized angle of view. As can be seen from FIG. 5, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within + -2 μm, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the whole image plane.
Second embodiment
Referring to fig. 6, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is convex at the paraxial region, and the image-side surface S8 is concave at the paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the present embodiment provides the relevant parameters of each lens in the optical lens as shown in table 3.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 4.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical lens are shown in fig. 7, 8, 9, and 10, respectively.
Fig. 7 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 7, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.2 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 8 shows f-tan θ distortion at different image heights on the image plane. As can be seen from fig. 8, the optical distortion at different image heights on the image plane is controlled within ± 3%, which indicates that the distortion of the optical lens is well corrected;
fig. 9 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 9, the offset of the axial chromatic aberration is controlled within ± 0.05 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 10 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 10, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Third embodiment
Referring to fig. 11, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is convex at the paraxial region, and the image-side surface S8 is concave at the paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens provided by the present embodiment are shown in table 5.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 6.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical lens are shown in fig. 12, 13, 14, and 15, respectively.
Fig. 12 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 12, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.35 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 13 shows f-tan θ distortion at different image heights on the image forming plane. As can be seen from fig. 13, the optical distortion at different image heights on the image plane is controlled within ± 3%, which indicates that the distortion of the optical lens is well corrected;
fig. 14 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 14, the offset of the axial chromatic aberration is controlled within ± 0.15 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 15 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 15, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fourth embodiment
Referring to fig. 16, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is convex at the paraxial region, and the image-side surface S8 is concave at the paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens in this embodiment are shown in table 7.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 8.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical lens are shown in fig. 17, 18, 19, and 20, respectively.
Fig. 17 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 17, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.3 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 18 shows f-tan θ distortion at different image heights on the image forming plane. As can be seen from fig. 18, the optical distortion at different image heights on the image plane is controlled within ± 3.5%, which indicates that the distortion of the optical lens is well corrected;
fig. 19 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 19, the offset of the axial chromatic aberration is controlled within ± 0.04 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 20 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 20, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fifth embodiment
Referring to fig. 21, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is concave, and the image-side surface S8 is concave at paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens in this embodiment are shown in table 9.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 10.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical lens are shown in fig. 22, 23, 24, and 25, respectively.
Fig. 22 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 22, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.3 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 23 shows f-tan θ distortion at different image heights on the image forming plane. As can be seen from fig. 23, the optical distortion at different image heights on the image plane is controlled within ± 4%, which indicates that the distortion of the optical lens is well corrected;
fig. 24 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 24, the offset of the axial chromatic aberration is controlled within ± 0.08 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 25 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 25, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.5 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Sixth embodiment
Referring to fig. 26, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is concave, and the image-side surface S8 is concave at paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens in the present embodiment are shown in table 11.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 12.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and lateral chromatic aberration of the optical lens are shown in fig. 27, 28, 29, and 30, respectively.
Fig. 27 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 27, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.5 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 28 shows f-tan θ distortion at different image heights on the image plane. As can be seen from fig. 28, the optical distortion at different image heights on the image plane is controlled within ± 4%, which indicates that the distortion of the optical lens is well corrected;
fig. 29 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 29, the offset of the axial chromatic aberration is controlled within ± 0.13 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 30 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 30, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 3.5 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Seventh embodiment
Referring to fig. 31, a schematic structural diagram of an optical lens according to the present embodiment includes, in order from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter G1.
The first lens element L1 is a plastic aspheric lens with positive power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave at paraxial region and the image-side surface S4 is concave;
the third lens element L3 is a plastic aspheric lens with positive power, with the object-side surface S5 being convex at the paraxial region and the image-side surface S6 being concave at the paraxial region;
the fourth lens element L4 is a plastic aspheric lens with negative power, the object-side surface S7 is concave, and the image-side surface S8 is concave at paraxial region;
the fifth lens element L5 is a plastic aspheric lens with positive power, the object-side surface S9 is convex at paraxial region, and the image-side surface S10 is convex;
the sixth lens element L6 is a plastic aspheric lens with negative power, the object-side surface S11 is concave at the paraxial region, and the image-side surface S12 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens in the present embodiment are shown in table 13.
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 14.
In the present embodiment, graphs of curvature of field, distortion, axial chromatic aberration, and lateral chromatic aberration of the optical lens are shown in fig. 32, 33, 34, and 35, respectively.
Fig. 32 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 32, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.2 mm, which indicates that the field curvature of the optical lens is better corrected;
fig. 33 shows f-tan θ distortion at different image heights on the image forming plane. As can be seen from fig. 33, the optical distortion at different image heights on the image plane is controlled within ± 4%, which indicates that the distortion of the optical lens is well corrected;
fig. 34 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 34, the offset of the axial chromatic aberration is controlled within ± 0.04 mm, which indicates that the optical lens can effectively correct the axial chromatic aberration;
fig. 35 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 35, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1 micron, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Table 15 shows the optical characteristics corresponding to the seven embodiments, which mainly include the effective focal length F, F #, total optical length TTL, and field angle FOV of the optical lens, and the values corresponding to each of the above conditional expressions.
In summary, the optical lens provided in this embodiment has at least the following advantages:
(1) the lens has the advantages that six lenses with specific refractive power are adopted, and specific surface shapes and matching of the lenses are adopted, so that the wide visual angle is met, the structure is more compact, the aperture is increased, and the lens is miniaturized, and the balance among the large aperture and the wide visual angle is well realized.
(2) In addition, the optical lens designed by the method enhances the resolution of an imaging picture, has more advantages in detail grabbing of the scenery, and has better imaging quality.
In the above embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be glass lenses, or may be a combination of plastic lenses and glass lenses.
The optical lens in the above embodiments can be applied to a terminal having a lens, such as a mobile phone, a tablet, a camera, etc.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. An optical lens system comprising six lenses, comprising, in order from an object side to an image plane along an optical axis:
a diaphragm;
the first lens with positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
a second lens element having a negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave;
a third lens element having a positive optical power, the object side surface being convex at a paraxial region and the image side surface being concave at a paraxial region;
a fourth lens having a negative optical power, the image side surface being concave at the paraxial region;
a fifth lens element with positive optical power having a convex object-side surface at paraxial region and a convex image-side surface;
a sixth lens element with negative optical power, the object side surface being concave at the paraxial region and the image side surface being concave at the paraxial region;
the optical lens satisfies the following conditional expression:
4.92mm≤f×tan（Semi-FOV）≤5.26mm；
wherein f is an effective focal length of the optical lens, and Semi-FOV is a maximum half field angle of the optical lens;
0.89≤（CT3+CT4）/T34≤1.55；
wherein CT3 is a center thickness of the third lens, CT4 is a center thickness of the fourth lens, and T34 is a separation distance of the third lens and the fourth lens on the optical axis.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.27≤TTL/ImgH≤1.38；
TTL denotes a distance on the optical axis from the object side surface of the first lens element to the imaging surface, and ImgH denotes a half of a diagonal length of an effective pixel area on the imaging surface of the optical lens.
3. An optical lens barrel according to claim 1, wherein a radius of curvature R41 of an object side surface of the fourth lens and a radius of curvature R42 of an image side surface of the fourth lens satisfy the following conditional expression:
0.5≤（R41+R42）/（R41-R42）≤20.0。
4. an optical lens according to claim 1, characterized in that a combined focal length f123 of the first lens, the second lens and the third lens and an effective focal length f of the optical lens satisfy the following conditional expression:
1.01≤f123/f≤1.24。
5. an optical lens according to claim 1, characterized in that the combined focal length f456 of the fourth, fifth and sixth lenses and the effective focal length f of the optical lens satisfy the following conditional expression:
-3.65≤f456/f≤-0.91。
6. an optical lens according to claim 1, characterized in that the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy the following conditional expression:
-0.68≤（ET4-CT4）/CT4≤-0.39。
7. an optical lens barrel according to claim 1, wherein the object side surface of the fourth lens is concave.
8. An optical lens barrel according to claim 1, wherein the object side surface of the fourth lens element is convex at the paraxial region.
9. An optical lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses.
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| CN211653280U (en) * | 2020-01-06 | 2020-10-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN112987262A (en) * | 2021-04-20 | 2021-06-18 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
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| CN211653280U (en) * | 2020-01-06 | 2020-10-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
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