CN112433344A - Optical imaging lens - Google Patents
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- CN112433344A CN112433344A CN202011413828.1A CN202011413828A CN112433344A CN 112433344 A CN112433344 A CN 112433344A CN 202011413828 A CN202011413828 A CN 202011413828A CN 112433344 A CN112433344 A CN 112433344A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 45
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims 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
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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Abstract
The invention relates to the field of lenses. The invention discloses an optical imaging lens, which is characterized in that nine lenses are sequentially arranged along an optical axis from an object side to an image side; the first lens element has a positive refractive index, the object side surface of the first lens element is a convex surface, the second lens element, the fourth lens element and the sixth lens element are convex and convex lenses with positive refraction, the third lens element, the fifth lens element and the seventh lens element are concave and concave lenses with negative refractive index, the eighth lens element has a positive refractive index, the object side surface of the eighth lens element is a convex surface, the ninth lens element has a negative refractive index, the object side surface of the ninth lens element is a concave surface, the second lens element and the third lens element are mutually cemented, the fourth lens element and the fifth lens element are mutually cemented, and the sixth lens element and the seventh lens element are mutually cemented. The invention has the advantages that the visible light wave band and the infrared wave band are considered, and the imaging quality is good at both the visible light wave band and the infrared wave band; is small and convenient to carry; the temperature drift is small, and the working state under various temperature environments can be well maintained.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens for laser ranging.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography, machine vision systems, video conferences, laser ranging and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the existing optical imaging lens for laser ranging has many defects, such as the support of the optical imaging lens in an infrared light band and the sacrifice of the imaging quality in a visible light band; the structure is long, the mass is large, and the carrying is inconvenient; the temperature drift amount is large, and when the temperature disturbance is too large, the imaging quality is influenced; low relative illumination, insufficient imaging brightness in a dark environment, etc., and thus, it is necessary to improve it to meet the increasing demands of consumers.
Disclosure of Invention
The present invention is directed to an optical imaging lens to solve the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the ninth lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element has positive refractive index, and the object-side surface of the first lens element is convex;
the second lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface;
the ninth lens element has a negative refractive index, and the object-side surface of the ninth lens element is concave;
the second lens and the third lens are mutually glued, the fourth lens and the fifth lens are mutually glued, and the sixth lens and the seventh lens are mutually glued;
the optical imaging lens has only the first lens element to the ninth lens element with refractive index.
Further, the optical imaging lens further satisfies: 1.10< (f1/f) <3.70, 0.40< (f2/f) <0.62, -0.82< (f3/f) < -0.50, 0.20< (f4/f) <0.50, -0.40< (f5/f) < -0.20, 0.20< (f6/f) <0.50, -0.40< (f7/f) < -0.20, 0.30< (f8/f) <0.80, -0.85< (f9/f) < -0.20, wherein f is a focal length of the optical imaging lens, f1, f2, f3, f4, f5, f6, f7, f8, and f9 are focal lengths of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the ninth lens, and the ninth lens, respectively.
Further, the optical imaging lens further satisfies: 116.0mm < f1<363.0mm, 53.0mm < f2<62.0mm, -82.0mm < f3< -55.0mm, 33.0mm < f4<41.0mm, -38.0mm < f5< -22.0mm, 23.0mm < f6<43.0mm, -36.0mm < f7< -28.0mm, 38.0mm < f8<77.0mm, -81.0mm < f9< -30.0mm, wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens, respectively.
Further, the temperature coefficients of refractive indexes of the second lens, the seventh lens and the ninth lens are out of the range of conventional glasses.
Further, the optical imaging lens further satisfies: vd2-vd3>30, where vd2 is the abbe number of the second lens and vd3 is the abbe number of the third lens.
Further, the optical imaging lens further satisfies: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.
Further, the optical imaging lens further satisfies: vd6-vd7>30, where vd6 is the Abbe number of the sixth lens and vd7 is the Abbe number of the seventh lens.
Furthermore, the object side surface and the image side surface of the first lens, the object side surface of the second lens, the image side surface of the third lens, the object side surface of the fourth lens, the image side surface of the fifth lens, the object side surface of the sixth lens, the image side surface of the seventh lens, the object side surface and the image side surface of the eighth lens, and the object side surface and the image side surface of the ninth lens are respectively coated with antireflection films with the wave bands of 400-1100 nm.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the first lens to the ninth lens are all glass spherical lenses.
The invention has the beneficial technical effects that:
the invention adopts nine lenses, and through correspondingly designing each lens, the visible light wave band and the infrared wave band are considered, and the imaging quality is good at both the visible light wave band and the infrared wave band (supporting the fog penetration function); the optical total length is short, the weight is light, and the device is small and convenient to carry; the temperature drift amount is small, and the working state under various temperature environments can be well kept; high contrast and can ensure the imaging brightness in a dark environment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is an MTF graph of visible light 435-656nm according to the first embodiment of the present invention;
FIG. 3 is a defocus plot of 80lp/mm in visible light 435-656nm in the first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram according to a first embodiment of the present invention;
FIG. 5 is a graph of field curvature and distortion curves of a first embodiment of the present invention;
FIG. 6 is a dot-column diagram according to a first embodiment of the present invention;
FIG. 7 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 8 is an MTF graph of visible light 435-656nm according to the second embodiment of the present invention;
FIG. 9 is a defocus plot of 80lp/mm in visible light 435-656nm of the second embodiment of the present invention;
FIG. 10 is a vertical axis chromatic aberration diagram according to a second embodiment of the present invention;
FIG. 11 is a graph showing curvature of field and distortion in a second embodiment of the present invention;
FIG. 12 is a dot-column diagram according to a second embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 14 is an MTF graph of visible light 435-656nm according to a third embodiment of the present invention;
FIG. 15 is a defocus plot of 80lp/mm in visible light 435-656nm of the third embodiment of the present invention;
FIG. 16 is a vertical axis color difference graph according to a third embodiment of the present invention;
FIG. 17 is a graph of field curvature and distortion for a third embodiment of the present invention;
FIG. 18 is a dot diagram of a third embodiment of the present invention;
FIG. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 20 is an MTF graph of visible light 435-656nm according to a fourth embodiment of the present invention;
FIG. 21 is a defocus plot of 80lp/mm in visible light 435-656nm of example IV of the present invention;
FIG. 22 is a vertical axis chromatic aberration diagram according to a fourth embodiment of the present invention;
FIG. 23 is a graph of field curvature and distortion for a fourth embodiment of the present invention;
FIG. 24 is a dot diagram according to a fourth embodiment of the present invention;
FIG. 25 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 26 is the MTF graph of visible light 435-656nm in the fifth embodiment of the present invention;
FIG. 27 is a defocus plot of 80lp/mm in visible light 435-;
FIG. 28 is a vertical axis color difference graph of a fifth embodiment of the present invention;
FIG. 29 is a graph of field curvature and distortion for example five of the present invention;
FIG. 30 is a dot-column diagram of the fifth embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the ninth lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light.
The first lens element has positive refractive index, and the object-side surface of the first lens element is convex.
The second lens element with positive refractive index has a convex object-side surface and a convex image-side surface.
The third lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fifth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The eighth lens element has a positive refractive index, and the object-side surface of the eighth lens element is convex.
The ninth lens element has a negative refractive index, and an object-side surface of the ninth lens element is concave.
The second lens and the third lens are mutually glued, the fourth lens and the fifth lens are mutually glued, and the sixth lens and the seventh lens are mutually glued.
The optical imaging lens has only the first lens element to the ninth lens element with refractive index. The invention adopts nine lenses, and each lens is correspondingly designed, so that the visible light wave band and the infrared wave band are considered, the imaging quality is good at the visible light wave band, and the fog penetration function (namely the use of the infrared wave band) is supported; the optical total length is short, the weight is light, and the device is small and convenient to carry; the temperature drift amount is small, and the working state under various temperature environments can be well kept; high contrast and can ensure the imaging brightness in a dark environment.
Preferably, the optical imaging lens further satisfies: 1.10< (f1/f) <3.70, 0.40< (f2/f) <0.62, -0.82< (f3/f) < -0.50, 0.20< (f4/f) <0.50, -0.40< (f5/f) < -0.20, 0.20< (f6/f) <0.50, -0.40< (f7/f) < -0.20, 0.30< (f8/f) <0.80, -0.85< (f9/f) < -0.20, wherein f is a focal length of the optical imaging lens, f1, f2, f3, f4, f5, f6, f7, f8, and f9 are a first lens, a second lens, a third lens, a fourth lens, a sixth lens, a seventh lens, a ninth lens, a focal length of the imaging lens, and a focal length of the ninth lens are more preferable.
Preferably, the optical imaging lens further satisfies: 116.0mm < f1<363.0mm, 53.0mm < f2<62.0mm, -82.0mm < f3< -55.0mm, 33.0mm < f4<41.0mm, -38.0mm < f5< -22.0mm, 23.0mm < f6<43.0mm, -36.0mm < f7< -28.0mm, 38.0mm < f8<77.0mm, -81.0mm < f9< -30.0mm, wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens, respectively, and the focal lengths of the light distribution lens are reasonably divided to make the system more stable.
Preferably, the temperature coefficients of the refractive indexes of the second lens, the seventh lens and the ninth lens are not in the range of conventional glass (specifically, the temperature coefficient of the refractive index is a negative value), and the temperature drift is further controlled, so that when the lens is used in a temperature range from 10 ℃ to 85 ℃, the image is clear and is not out of focus, and the requirements of most service environments are met.
Preferably, the optical imaging lens further satisfies: vd2-vd3>30, wherein vd2 is the dispersion coefficient of the second lens, and vd3 is the dispersion coefficient of the third lens, so that chromatic aberration is further corrected, and the blue-violet edge phenomenon easily occurring in lens imaging is avoided.
Preferably, the optical imaging lens further satisfies: vd5-vd4>30, wherein vd4 is the dispersion coefficient of the fourth lens, and vd5 is the dispersion coefficient of the fifth lens, so that chromatic aberration is further corrected, and the blue-violet edge phenomenon easily occurring in lens imaging is avoided.
Preferably, the optical imaging lens further satisfies: vd6-vd7>30, wherein vd6 is the dispersion coefficient of the sixth lens, and vd7 is the dispersion coefficient of the seventh lens, so that chromatic aberration is further corrected, and the blue-violet edge phenomenon easily occurring in lens imaging is avoided.
Preferably, the object-side surface and the image-side surface of the first lens, the object-side surface of the second lens, the image-side surface of the third lens, the object-side surface of the fourth lens, the image-side surface of the fifth lens, the object-side surface of the sixth lens, the image-side surface of the seventh lens, the object-side surface and the image-side surface of the eighth lens, and the object-side surface and the image-side surface of the ninth lens are respectively coated with antireflection films with wave bands of 400 and 1100nm, so that the overall signal transmittance is increased.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that chromatic aberration is further optimized, and the overall performance is improved.
Preferably, the first lens to the ninth lens are all glass spherical lenses, so that the stability of the system is improved, the processing is easy, and the cost is reduced.
The optical imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens includes, in order along an optical axis I from an object side a1 to an image side a2, a first lens 1, a second lens 2, a third lens 3, a diaphragm 100, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a protective glass 110, and an image plane 120; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side a1 and passing the imaging light rays and an image-side surface facing the image side a2 and passing the imaging light rays.
The first lens element 1 has a positive refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is convex, although in some embodiments, the image-side surface 12 of the first lens element 1 may also be concave or planar.
The second lens element 2 has a positive refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is convex.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is concave and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, and an object-side surface 41 and an image-side surface 42 of the fourth lens element 4 are convex and substantially parallel to each other.
The fifth lens element 5 has a negative refractive index, and an object-side surface 51 of the fifth lens element 5 is concave and an image-side surface 52 of the fifth lens element 5 is concave.
The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.
The seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is concave and an image-side surface 72 of the seventh lens element 7 is concave.
The eighth lens element 8 has a positive refractive index, the object-side surface 81 of the eighth lens element 8 is convex, and the image-side surface 82 of the eighth lens element 8 is convex, although in some embodiments, the image-side surface 82 of the eighth lens element 8 can also be concave or planar.
The ninth lens element 9 has negative refractive power, the object-side surface 91 of the ninth lens element 9 is concave, and the image-side surface 92 of the ninth lens element 9 is concave, although in some embodiments, the image-side surface 92 of the ninth lens element 9 can also be convex or flat.
The second lens 2 and the third lens 3 are cemented with each other, the fourth lens 4 and the fifth lens 5 are cemented with each other, and the sixth lens 6 and the seventh lens 7 are cemented with each other.
In the present embodiment, the diaphragm 100 is disposed between the third lens 3 and the fourth lens 4, but the present invention is not limited thereto, and in other embodiments, the diaphragm 100 may be disposed at other suitable positions.
In this embodiment, the first lens 1 to the ninth lens 9 are all glass spherical lenses, but not limited thereto.
In this embodiment, the object-side surface 11 and the image-side surface 12 of the first lens element 1, the object-side surface 21 of the second lens element 2, the image-side surface 32 of the third lens element 3, the object-side surface 41 of the fourth lens element 4, the image-side surface 52 of the fifth lens element 5, the object-side surface 61 of the sixth lens element 6, the image-side surface 72 of the seventh lens element 7, the object-side surface 81 and the image-side surface 82 of the eighth lens element 8, and the object-side surface 91 and the image-side surface 92 of the ninth lens element 9 are respectively coated with antireflection films with a wavelength of 400 and 1100 nm.
In this specific embodiment, the temperature coefficients of refractive indices of the second lens, the seventh lens, and the ninth lens are negative values.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF graph of the present embodiment is shown in detail in fig. 2, the defocus graph is shown in detail in fig. 3, the vertical axis chromatic aberration graph is shown in detail in fig. 4, the field curvature and distortion graph is shown in detail in (a) and (B) of fig. 5, and the stippling graph is shown in fig. 6, which shows that in the visible light band, the resolution is high, the image is clear, the field curvature and distortion are small, the F-tan (theta) distortion is less than 0.3%, the image is clear and not deformed, the chromatic aberration and the aberration are small, the blue-violet edge chromatic aberration is well eliminated, and the image quality is good. In addition, the relative illumination of the embodiment is more than 80%, and the imaging brightness can be ensured in a dark environment.
When the temperature of the present embodiment is within the range of 10 ℃ to 85 ℃, the picture is clear without defocusing.
In this embodiment, the focal length f of the optical imaging lens is 100.0 mm; f-number FNO 3.0; field angle FOV is 5.2 °; the size of an image surface is 9.11 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 100.82 mm.
Example two
As shown in fig. 7, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF graph of the present embodiment is shown in detail in fig. 8, the defocus graph is shown in detail in fig. 9, the vertical axis chromatic aberration graph is shown in detail in fig. 10, the field curvature and distortion graph is shown in detail in (a) and (B) of fig. 11, and the stippling graph is shown in fig. 12, which shows that in the visible light band, the resolution is high, the image is clear, the field curvature and distortion are small, the F-tan (theta) distortion is less than 0.35%, the image is clear and is not deformed, the chromatic aberration and the aberration are small, the blue-violet edge chromatic aberration is well eliminated, and the image quality is good. In addition, the relative illumination of the embodiment is more than 80%, and the imaging brightness can be ensured in a dark environment.
When the temperature of the present embodiment is within the range of 10 ℃ to 85 ℃, the picture is clear without defocusing.
In this embodiment, the focal length f of the optical imaging lens is 99.8 mm; f-number FNO 3.0; field angle FOV is 5.2 °; the size of an image surface is 9.11 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 100.00 mm.
EXAMPLE III
As shown in fig. 13, the surface convexoconcave and the refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the image-side surface 92 of the ninth lens element 9 is convex, and the optical parameters such as the curvature radius of each lens element surface and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF graph of this embodiment is shown in detail in fig. 14, the defocus graph is shown in detail in fig. 15, the vertical axis chromatic aberration graph is shown in detail in fig. 16, the field curvature and distortion graph is shown in detail in (a) and (B) of fig. 17, and the stippling graph is shown in fig. 18, which shows that in the visible light band, the resolution is high, the image is clear, the field curvature and distortion are small, the F-tan (theta) distortion is less than 0.2%, the image is clear and not deformed, the chromatic aberration and the aberration are small (the chromatic aberration correction is worse than that of the first embodiment), the blue-violet side chromatic aberration is well eliminated, and the image quality. In addition, the relative illumination of the embodiment is more than 80%, and the imaging brightness can be ensured in a dark environment.
When the temperature of the present embodiment is within the range of 10 ℃ to 85 ℃, the picture is clear without defocusing.
In this embodiment, the focal length f of the optical imaging lens is 99.9 mm; f-number FNO 3.0; field angle FOV is 5.2 °; the size of an image surface is 9.10 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 100.30 mm.
Example four
As shown in fig. 19, the surface convexities and concavities and refractive indexes of the lenses of the present embodiment are substantially the same as those of the first embodiment, and only the image-side surface 12 of the first lens element 1, the image-side surface 82 of the eighth lens element 8, and the image-side surface 92 of the ninth lens element 9 are concave, and the optical parameters such as the curvature radius of the lens surfaces and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF graph of the present embodiment is shown in detail in fig. 20, the defocus graph is shown in detail in fig. 21, the vertical axis chromatic aberration graph is shown in detail in fig. 22, the field curvature and distortion graph is shown in detail in (a) and (B) of fig. 23, and the stippling graph is shown in fig. 24, which shows that in the visible light band, the resolution is high, the image is clear, the field curvature and distortion are small, the F-tan (theta) distortion is less than 0.2%, the image is clear and not deformed, the chromatic aberration and the aberration are small, the blue-violet edge chromatic aberration is well eliminated, and the image quality is good. In addition, the relative illumination of the embodiment is more than 80%, and the imaging brightness can be ensured in a dark environment.
When the temperature of the present embodiment is within the range of 10 ℃ to 85 ℃, the picture is clear without defocusing.
In this embodiment, the focal length f of the optical imaging lens is 100.0 mm; f-number FNO 3.0; field angle FOV is 5.2 °; the size of an image surface is 9.10 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 100.00 mm.
EXAMPLE five
As shown in fig. 25, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 5-1.
TABLE 5-1 detailed optical data for EXAMPLE V
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF graph of the present embodiment is shown in detail in fig. 26, the defocus graph is shown in detail in fig. 27, the vertical axis chromatic aberration graph is shown in detail in fig. 28, the field curvature and distortion graph is shown in detail in (a) and (B) of fig. 29, and the stippling graph is shown in fig. 30, which shows that in the visible light band, the resolution is high, the image is clear, the field curvature and distortion are small, the F-tan (theta) distortion is less than 0.4%, the image is clear and not deformed, the chromatic aberration and the aberration are small, the blue-violet edge chromatic aberration is well eliminated, and the image quality is good. In addition, the relative illumination of the embodiment is more than 80%, and the imaging brightness can be ensured in a dark environment.
When the temperature of the present embodiment is within the range of 10 ℃ to 85 ℃, the picture is clear without defocusing.
In this embodiment, the focal length f of the optical imaging lens is 100.0 mm; f-number FNO 3.0; field angle FOV is 5.2 °; the size of an image surface is 9.12 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 100.30 mm.
TABLE 6 values of relevant important parameters for five embodiments of the invention
| Example one | Example two | EXAMPLE III | Example four | EXAMPLE five | |
| f1 | 202.13 | 173.53 | 116.44 | 362.30 | 134.65 |
| f2 | 55.86 | 56.57 | 59.96 | 57.26 | 61.12 |
| f3 | -76.88 | -81.19 | -74.87 | -56.34 | -67.74 |
| f4 | 36.33 | 40.91 | 40.43 | 37.98 | 33.59 |
| f5 | -25.04 | -28.02 | -23.95 | -37.13 | -23.98 |
| f6 | 26.84 | 31.02 | 26.63 | 42.06 | 25.65 |
| f7 | -32.51 | -35.26 | -28.33 | -35.98 | -28.76 |
| f8 | 44.77 | 52.87 | 58.97 | 75.98 | 38.84 |
| f9 | -32.96 | -42.16 | -52.24 | -80.66 | -31.23 |
| f | 100.0 | 99.8 | 99.9 | 100.0 | 100.0 |
| f1/f | 2.02 | 1.74 | 1.17 | 3.62 | 1.35 |
| f2/f | 0.56 | 0.57 | 0.60 | 0.57 | 0.61 |
| f3/f | -0.77 | -0.81 | -0.75 | -0.56 | -0.68 |
| f4/f | 0.36 | 0.41 | 0.40 | 0.38 | 0.34 |
| f5/f | -0.25 | -0.28 | -0.24 | -0.37 | -0.24 |
| f6/f | 0.27 | 0.31 | 0.27 | 0.42 | 0.26 |
| f7/f | -0.33 | -0.35 | -0.28 | -0.36 | -0.29 |
| f8/f | 0.45 | 0.53 | 0.59 | 0.76 | 0.39 |
| f9/f | -0.33 | -0.42 | -0.52 | -0.81 | -0.31 |
| vd2-vd3 | 56.12 | 53.83 | 48.31 | 56.12 | 56.12 |
| vd5-vd4 | 32.47 | 32.47 | 29.47 | 32.47 | 32.47 |
| vd6-vd7 | 31.16 | 31.16 | 31.24 | 31.24 | 31.24 |
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens characterized in that: the optical lens assembly sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along an optical axis; the first lens element to the ninth lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element has positive refractive index, and the object-side surface of the first lens element is convex;
the second lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface;
the ninth lens element has a negative refractive index, and the object-side surface of the ninth lens element is concave;
the second lens and the third lens are mutually glued, the fourth lens and the fifth lens are mutually glued, and the sixth lens and the seventh lens are mutually glued;
the optical imaging lens has only the first lens element to the ninth lens element with refractive index.
2. The optical imaging lens of claim 1, further satisfying: 1.10< (f1/f) <3.70, 0.40< (f2/f) <0.62, -0.82< (f3/f) < -0.50, 0.20< (f4/f) <0.50, -0.40< (f5/f) < -0.20, 0.20< (f6/f) <0.50, -0.40< (f7/f) < -0.20, 0.30< (f8/f) <0.80, -0.85< (f9/f) < -0.20, wherein f is a focal length of the optical imaging lens, f1, f2, f3, f4, f5, f6, f7, f8, and f9 are focal lengths of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the ninth lens, and the ninth lens, respectively.
3. The optical imaging lens of claim 1, further satisfying: 116.0mm < f1<363.0mm, 53.0mm < f2<62.0mm, -82.0mm < f3< -55.0mm, 33.0mm < f4<41.0mm, -38.0mm < f5< -22.0mm, 23.0mm < f6<43.0mm, -36.0mm < f7< -28.0mm, 38.0mm < f8<77.0mm, -81.0mm < f9< -30.0mm, wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens, respectively.
4. The optical imaging lens according to claim 1, characterized in that: the temperature coefficients of refractive indices of the second lens, the seventh lens, and the ninth lens are out of the range of conventional glasses.
5. The optical imaging lens of claim 1, further satisfying: vd2-vd3>30, where vd2 is the abbe number of the second lens and vd3 is the abbe number of the third lens.
6. The optical imaging lens of claim 1, further satisfying: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.
7. The optical imaging lens of claim 1, further satisfying: vd6-vd7>30, where vd6 is the Abbe number of the sixth lens and vd7 is the Abbe number of the seventh lens.
8. The optical imaging lens according to claim 1, characterized in that: the object side surface and the image side surface of the first lens, the object side surface of the second lens, the image side surface of the third lens, the object side surface of the fourth lens, the image side surface of the fifth lens, the object side surface of the sixth lens, the image side surface of the seventh lens, the object side surface and the image side surface of the eighth lens, and the object side surface and the image side surface of the ninth lens are respectively coated with antireflection films with wave bands of 400-1100 nm.
9. The optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.
10. The optical imaging lens according to claim 1, characterized in that: the first lens to the ninth lens are all glass spherical lenses.
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| CN114355567A (en) * | 2022-01-12 | 2022-04-15 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
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