CN113419325A - Optical imaging lens matched with liquid lens - Google Patents
Optical imaging lens matched with liquid lens Download PDFInfo
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- CN113419325A CN113419325A CN202011160925.4A CN202011160925A CN113419325A CN 113419325 A CN113419325 A CN 113419325A CN 202011160925 A CN202011160925 A CN 202011160925A CN 113419325 A CN113419325 A CN 113419325A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 54
- 239000007788 liquid Substances 0.000 title claims abstract description 37
- 230000003287 optical effect Effects 0.000 claims description 33
- 238000003384 imaging method Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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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
- G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
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Abstract
The invention relates to the technical field of lenses. The invention discloses an optical imaging lens matched with a liquid lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a tenth lens, wherein the first lens, the second lens, the third lens and the fourth lens are arranged in parallel; the first lens is a convex-concave lens with positive refractive index; the second lens is a convex-concave lens with negative refractive index; the third lens is a concave-convex lens with positive refractive index; the fourth lens is a concave-convex lens with negative refractive index; the fifth lens element with positive refractive index and a convex object-side surface; the sixth lens is a concave lens with negative refractive index; the seventh lens element, the eighth lens element and the ninth lens element are all convex lenses with positive refractive index; the tenth lens element with negative refractive index has a concave object-side surface; the third lens and the fourth lens are mutually glued, and the sixth lens and the seventh lens are mutually glued. The invention can automatically focus and can simultaneously obtain high resolution images under different object distances; the resolution ratio is high, the field curvature is small, and the center edge simultaneously achieves the high resolution ratio; large light transmission, high contrast and large image surface.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens matched with a liquid lens.
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, video conferences, vehicle-mounted monitoring, security monitoring, machine vision systems and the like, so that the requirements on the optical imaging lenses are higher and higher.
Under different object distances of a common optical imaging lens, the back focus of the lens can deviate to influence the imaging quality; even if refocusing again, the lens still has larger curvature of field, and the optical imaging lens matched with the liquid lens can solve the problem, but the existing optical imaging lens matched with the liquid lens has many defects, such as small light transmission and large energy loss due to the aperture limitation of the liquid lens; the relative illumination is reduced, and the edge is dark; the resolution is reduced, a large number of pixels are lost, and the imaging quality is poor; the image plane is smaller, and the like, so that the requirements which are increasingly improved cannot be met, and the improvement is urgently needed.
Disclosure of Invention
The present invention is directed to an optical imaging lens with a liquid lens to solve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens matched with a liquid lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, a sixth lens and a tenth lens from an object side to an image side along an optical axis; the first lens element to the tenth 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 with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element has positive refractive index, and the object-side surface of the fifth lens element is convex;
the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element has positive refractive index; the object side surface of the seventh lens is a convex surface; the image side surface of the seventh lens is a convex surface;
the eighth lens element has positive refractive index; the object side surface of the eighth lens is a convex surface; the image side surface of the eighth lens is a convex surface;
the ninth lens element has positive refractive index; the object side surface of the ninth lens is a convex surface; the image side surface of the ninth lens is convex;
the tenth lens element with negative refractive index has a concave object-side surface;
the third lens and the fourth 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 tenth lens element with refractive index.
Further, the liquid lens further comprises a diaphragm, and the diaphragm is arranged between the fifth lens and the liquid lens.
Furthermore, the optical imaging lens further satisfies the following conditions: -fA/fB | > 4, wherein fA is the combined focal length of the first lens element to the fifth lens element, and fB is the combined focal length of the sixth lens element to the tenth lens element.
Further, the optical imaging lens further satisfies the following conditions: 1.8 < nd1 < 2.05, 1.5 < nd2 < 1.8, 1.8 < nd3 < 2.05, 1.8 < nd4 < 2.05, 1.7 < nd5 < 2.05, 1.7 < nd6 < 2.05, 1.48 < nd7 < 1.8, 1.7 < nd8 < 2.05, 1.5. ltoreq. nd9 < 1.75, 1.8 < nd10 < 2.05, where nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8, nd9 and nd10 are refractive indices of the first lens to the tenth lens, respectively.
Further, the ninth lens and the tenth lens are cemented to each other.
Further, the optical imaging lens further satisfies the following conditions: the BFL/TTL is more than or equal to 0.12, wherein the BFL is the distance between the image side surface of the tenth lens and the imaging surface on the optical axis, and the TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
Further, the optical imaging lens further satisfies the following conditions: d22/TTL is less than or equal to 0.2, wherein d22 is the lens caliber of the image side surface of the second lens, and TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
Further, the optical imaging lens further satisfies the following conditions: | -f 2/f ≦ 1.5 more than or equal to 0.5, and ≦ f8/f ≦ 2, where f2 is the focal length of the second lens element, f8 is the focal length of the eighth lens element, and f is the focal length of the lens element.
Further, the optical imaging lens further satisfies the following conditions: | vd3-vd4 | > 10, | vd6-vd7 | 20, | vd9-vd10 | 20, where vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, vd6 is the abbe number of the sixth lens, vd7 is the abbe number of the seventh lens, vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens.
The invention has the beneficial technical effects that:
the invention can automatically focus by matching with the liquid lens, and can obtain high resolution images under different object distances without changing the optical back focus; under different object distances, the resolution is high, the field curvature is small, and the central edge is ensured to achieve high resolution at the same time; the light transmission is large, the contrast is high, and the edge is bright; the image surface is large; small color difference and high color reducibility.
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 a graph of the MTF of 0.436-0.650 μm in visible light for a 0.3m working object distance in accordance with one embodiment of the present invention;
FIG. 3 is a graph of the MTF of 0.436-0.650 μm in visible light for a 0.6m working object distance in accordance with one embodiment of the present invention;
FIG. 4 is a graph of the MTF of 0.436-0.650 μm in visible light for a 1.5m working object distance in accordance with one embodiment of the present invention;
FIG. 5 is a defocus plot of 0.436-0.650 μm visible light in accordance with the first embodiment of the present invention;
FIG. 6 is a graph of relative illuminance in accordance with the first embodiment of the present invention;
FIG. 7 is a graph of chromatic aberration in accordance with a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 9 is a graph of the MTF of 0.436-0.650 μm in visible light for a second 0.3m working object distance in accordance with an embodiment of the present invention;
FIG. 10 is a graph of the MTF of 0.436-0.650 μm in visible light for a second 0.6m working object distance in accordance with an embodiment of the present invention;
FIG. 11 is a graph of the MTF of 0.436-0.650 μm in visible light for a second 1.5m working object distance in accordance with an embodiment of the present invention;
FIG. 12 is a defocus graph of 0.436-0.650 μm in visible light according to the second embodiment of the present invention;
FIG. 13 is a graph showing relative illuminance in a second embodiment of the present invention;
FIG. 14 is a graph showing color difference in a second embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is a graph of the MTF of 0.436-0.650 μm in visible light for a three 0.3m working object distance in accordance with an embodiment of the present invention;
FIG. 17 is a graph of the MTF of 0.436-0.650 μm in visible light for a three 0.6m working object distance in accordance with an embodiment of the present invention;
FIG. 18 is a graph of the MTF of 0.436-0.650 μm in visible light for a three 1.5m working object distance in accordance with an embodiment of the present invention;
FIG. 19 is a defocus graph of 0.436-0.650 μm in visible light according to the third embodiment of the present invention;
FIG. 20 is a graph showing relative illuminance in a third embodiment of the present invention;
FIG. 21 is a color difference graph according to a third embodiment of the present invention;
FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 23 is a graph of the MTF for 0.436-0.650 μm in visible light for a four 0.3m working object distance in accordance with an embodiment of the present invention;
FIG. 24 is a graph of the MTF for 0.436-0.650 μm in visible light for a four 0.6m working object distance in accordance with an embodiment of the present invention;
FIG. 25 is a graph of the MTF for 0.436-0.650 μm in visible light for a four 1.5m working object distance in accordance with an embodiment of the present invention;
FIG. 26 is a defocus graph of 0.436-0.650 μm in visible light according to example four of the present invention;
FIG. 27 is a graph showing relative illuminance in a fourth embodiment of the present invention;
FIG. 28 is a color difference graph according to a fourth 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.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics 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 provides an optical imaging lens matched with a liquid lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a liquid lens, a sixth lens and a tenth lens from an object side to an image side along an optical axis; the first lens element to the tenth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with positive refractive index has a convex object-side surface and a concave image-side surface.
The second lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The third lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The fourth lens element with negative refractive index has a concave object-side surface and a convex image-side surface.
The fifth lens element has positive refractive index, and the object-side surface of the fifth lens element is convex.
The sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The seventh lens element has positive refractive index; the object side surface of the seventh lens is a convex surface; the image side surface of the seventh lens is convex.
The eighth lens element has positive refractive index; the object side surface of the eighth lens is a convex surface; the image side surface of the eighth lens is convex.
The ninth lens element has positive refractive index; the object side surface of the ninth lens is a convex surface; the image side surface of the ninth lens is convex.
The tenth lens element has a negative refractive index, and an object-side surface of the tenth lens element is concave.
The third lens and the fourth 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 tenth lens element with refractive index. The invention can automatically focus by matching with the liquid lens, and can obtain high resolution images under different object distances without changing the optical back focus; under different object distances, the resolution is high, the field curvature is small, and the central edge is ensured to achieve high resolution at the same time; the light transmission is large, the contrast is high, and the edge is bright; the image surface is large; small color difference and high color reducibility.
Preferably, the optical imaging lens further comprises a diaphragm, the diaphragm is arranged between the fifth lens and the liquid lens, the diaphragm is arranged in the middle, the aperture of the liquid lens is utilized to the maximum extent, the light passing of the optical imaging lens is increased, and the structure miniaturization is guaranteed.
More preferably, the optical imaging lens further satisfies: -fA/fB | > 4, wherein fA is the combined focal length of the first lens element to the fifth lens element, and fB is the combined focal length of the sixth lens element to the tenth lens element, so that the aperture is positioned closer to the entrance pupil, and the aperture of the liquid lens is utilized to the maximum extent to increase the light passing through the optical imaging lens.
Preferably, the optical imaging lens further satisfies: 1.8 < nd1 < 2.05, 1.5 < nd2 < 1.8, 1.8 < nd3 < 2.05, 1.8 < nd4 < 2.05, 1.7 < nd5 < 2.05, 1.7 < nd6 < 2.05, 1.48 < nd7 < 1.8, 1.7 < nd8 < 2.05, 1.5. ltoreq. nd9 < 1.75, 1.8 < nd10 < 2.05, wherein nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8, nd9 and 36nd 29 are refractive indexes of the first lens to the tenth lens, and the refractive indexes are different, and the aperture of the lenses is further controlled, and high resolution is realized.
Preferably, the ninth lens and the tenth lens are mutually glued, so that the imaging quality is further improved.
Preferably, the optical imaging lens further satisfies: BFL/TTL is more than or equal to 0.12, wherein BFL is the distance on the optical axis from the image side surface of the tenth lens to the imaging surface, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, the optical back focus of the optical imaging lens is controlled, the overall weight and cost of the lens are favorably reduced, the CRA (chief ray angle) is favorably reduced, and the resolving power is improved.
Preferably, the optical imaging lens further satisfies: d22/TTL is less than or equal to 0.2, wherein d22 is the lens caliber of the image side surface of the second lens, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, light rays are collected quickly, and the total length and the outer diameter size of the optical imaging lens are reduced.
Preferably, the optical imaging lens further satisfies: f2/f |. is more than or equal to 0.5 and less than or equal to 1.5, and 1 ≦ f8/f |. 2, wherein f2 is the focal length of the second lens, f8 is the focal length of the eighth lens, and f is the focal length of the lens, so that the focal power is reasonably distributed, and the image quality is improved.
Preferably, the optical imaging lens further satisfies: | vd3-vd4 | > 10, | vd6-vd7 | > 20, | vd9-vd10 | > 20, wherein vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, vd6 is the abbe number of the sixth lens, vd7 is the abbe number of the seventh lens, vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens, which further optimizes chromatic aberration and improves image quality.
The following describes the optical imaging lens with liquid lens according to the present invention in detail with specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens with a liquid lens includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a stop 110, a liquid lens element 120, a sixth lens element 6, a seventh lens element 7, an eighth lens element 8, a ninth lens element 9, a tenth lens element 100, a protective glass 130, and an image plane 140; the first lens element 1 to the tenth lens element 100 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a positive refractive index, and an object-side surface 11 of the first lens element 1 is convex and an image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative 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 concave.
The third lens element 3 has a positive 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 convex.
The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive index, the object-side surface 51 of the fifth lens element 5 is a convex surface, and the image-side surface 52 of the fifth lens element 5 is a flat surface.
The sixth lens element 6 has a negative refractive index, and an object-side surface 61 of the sixth lens element 6 is concave and an image-side surface 62 of the sixth lens element 6 is concave.
The seventh lens element 7 has a positive refractive index; the object side 71 of the seventh lens element 7 is convex; the image-side surface 72 of the seventh lens element 7 is convex.
The eighth lens element 8 has a positive refractive index; the object-side surface 81 of the eighth lens element 8 is convex; the image-side surface 82 of the eighth lens element 8 is convex.
The ninth lens element 9 has a positive refractive index; the object side 91 of the ninth lens element 9 is convex; the image-side surface 92 of the ninth lens element 9 is convex.
The tenth lens element 100 with negative refractive power has a concave object-side surface 101 of the tenth lens element 100 and a concave image-side surface 102 of the tenth lens element 100, although the image-side surface 102 of the tenth lens element 100 can be convex or planar in other embodiments.
In this embodiment, the third lens 3 and the fourth lens 4 are cemented with each other, the sixth lens 6 and the seventh lens 7 are cemented with each other, and the ninth lens 9 and the tenth lens 100 are cemented with each other.
In this embodiment, the liquid lens 120 is a liquid lens of type EL-3-10, and the specific structure can refer to the prior art, which is not described in detail, but is not limited thereto.
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 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graphs of different working object distances of the specific embodiment are shown in detail in fig. 2, 3 and 4, and it can be seen that the working object distance is from 0.3m to 1.5m, the back focus is not changed, the resolution high frequency can reach 250lp/mm, the central contrast is more than 0.3, and the edge contrast is more than 0.2; the defocusing curve graph is shown in detail in FIG. 5, and it can be seen that the imaging quality is better; referring to fig. 6, it can be seen that the edge relative illuminance is greater than 80%, the central and peripheral illuminance are uniform, and the picture brightness is high; referring to FIG. 7, it can be seen that the off-axis chromatic aberration is within 3 μm at the wavelength range of 436nm-650nm, and the color reduction degree is high.
In this embodiment, the focal length f of the optical imaging lens is 9.5 mm; f-number FNO 3.0; field angle FOV is 56.0 °; the size phi of the image surface is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 47.5 mm.
Example two
As shown in fig. 8, in this embodiment, the surface convexities and concavities and refractive indexes of the lenses are substantially the same as those of the first embodiment, only the image-side surface 52 of the fifth lens element 5 is a convex surface, and the image-side surface 102 of the tenth lens element 100 is a convex surface, so that the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different. Further, in the present specific embodiment, the ninth lens 9 and the tenth lens 100 are not cemented.
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 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 9, 10 and 11 in detail, and it can be seen that the working object distance is from 0.3m to 1.5m, the back focus is not changed, the resolution high frequency can reach 250lp/mm, the central contrast is more than 0.3, and the edge contrast is more than 0.2; the defocusing graph is shown in detail in fig. 12, and it can be seen that the imaging quality is better; referring to fig. 13, it can be seen that the edge relative illuminance is greater than 80%, the central and peripheral illuminance are uniform, and the picture brightness is high; referring to FIG. 14, it can be seen that the off-axis chromatic aberration is within 3 μm at the wavelength range of 436nm-650nm, and the color reduction degree is high.
In this embodiment, the focal length f of the optical imaging lens is 9.47 mm; f-number FNO 3.0; field angle FOV is 56.0 °; the size phi of the image surface is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 44.9 mm.
EXAMPLE III
As shown in fig. 15, 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 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graphs of different working object distances of the specific embodiment are shown in fig. 16, 17 and 18 in detail, and it can be seen that the working object distance is from 0.3m to 1.5m, the back focus is not changed, the resolution high frequency can reach 250lp/mm, the central contrast is more than 0.3, and the edge contrast is more than 0.2; the defocusing graph is shown in detail in FIG. 19, and it can be seen that the imaging quality is better; referring to fig. 20, it can be seen that the edge relative illuminance is greater than 80%, the central and peripheral illuminance are uniform, and the picture brightness is high; referring to FIG. 21, it can be seen that the off-axis chromatic aberration is within 3 μm at the wavelength range of 436nm-650nm, and the color reduction degree is high.
In this embodiment, the focal length f of the optical imaging lens is 9.5 mm; f-number FNO 3.0; field angle FOV 56.5 °; the size phi of the image surface is 10.0 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 47.0 mm.
Example four
As shown in fig. 22, 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 52 of the fifth lens element 5 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different. Further, in the present specific embodiment, the ninth lens 9 and the tenth lens 100 are not cemented.
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 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 23, 24 and 25 in detail, and it can be seen that the working object distance is from 0.3m to 1.5m, the back focus is not changed, the resolution high frequency can reach 250lp/mm, the central contrast is more than 0.3, and the edge contrast is more than 0.2; the defocusing graph is shown in detail in FIG. 26, and it can be seen that the imaging quality is better; referring to fig. 27, it can be seen that the edge relative illuminance is greater than 80%, the central and peripheral illuminance are uniform, and the picture brightness is high; referring to FIG. 28, it can be seen that the off-axis chromatic aberration is within 3 μm at the wavelength range of 436nm-650nm, and the color reduction degree is high.
In this embodiment, the focal length f of the optical imaging lens is 9.5 mm; f-number FNO 3.0; field angle FOV is 56.0 °; the size phi of the image surface is 10.0 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 45.3 mm.
TABLE 5 values of relevant important parameters for four embodiments of the invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | |
| fA | -45.50 | -41.90 | -38.80 | -43.70 |
| fB | 8.80 | 9.00 | 8.70 | 8.60 |
| ∣fA/fB∣ | 5.17 | 4.66 | 4.46 | 5.08 |
| f | 9.50 | 9.47 | 9.50 | 9.49 |
| f2 | -8.31 | -7.85 | -7.55 | -7.42 |
| f8 | 11.91 | 12.11 | 11.93 | 12.00 |
| ∣f2/f∣ | 0.87 | 0.83 | 0.79 | 0.78 |
| ∣f8/f∣ | 1.25 | 1.28 | 1.26 | 1.26 |
| BFL | 6.90 | 6.90 | 6.80 | 6.10 |
| TTL | 47.50 | 44.90 | 47.00 | 45.30 |
| d22 | 7.3 | 7.4 | 7.1 | 7.2 |
| BFL/TTL | 0.15 | 0.15 | 0.14 | 0.13 |
| d22/TTL | 0.15 | 0.16 | 0.15 | 0.16 |
| ∣vd3-vd4∣ | 13.38 | 13.38 | 13.38 | 13.38 |
| ∣vd6-vd7∣ | 36.37 | 36.37 | 36.37 | 36.37 |
| ∣vd9-vd10∣ | 63.65 | 63.65 | 63.65 | 63.65 |
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 (9)
1. The utility model provides a collocation liquid lens's optical imaging lens which characterized in that: the liquid lens comprises first to fifth lenses, a liquid lens, and sixth to tenth lenses in sequence from an object side to an image side along an optical axis; the first lens element to the tenth 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 with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element has positive refractive index, and the object-side surface of the fifth lens element is convex;
the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element has positive refractive index; the object side surface of the seventh lens is a convex surface; the image side surface of the seventh lens is a convex surface;
the eighth lens element has positive refractive index; the object side surface of the eighth lens is a convex surface; the image side surface of the eighth lens is a convex surface;
the ninth lens element has positive refractive index; the object side surface of the ninth lens is a convex surface; the image side surface of the ninth lens is convex;
the tenth lens element with negative refractive index has a concave object-side surface;
the third lens and the fourth 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 tenth lens element with refractive index.
2. The optical imaging lens matched with a liquid lens as claimed in claim 1, wherein: the liquid lens further comprises a diaphragm, and the diaphragm is arranged between the fifth lens and the liquid lens.
3. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: -fA/fB | > 4, wherein fA is the combined focal length of the first lens element to the fifth lens element, and fB is the combined focal length of the sixth lens element to the tenth lens element.
4. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: 1.8 < nd1 < 2.05, 1.5 < nd2 < 1.8, 1.8 < nd3 < 2.05, 1.8 < nd4 < 2.05, 1.7 < nd5 < 2.05, 1.7 < nd6 < 2.05, 1.48 < nd7 < 1.8, 1.7 < nd8 < 2.05, 1.5. ltoreq. nd9 < 1.75, 1.8 < nd10 < 2.05, where nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8, nd9 and nd10 are refractive indices of the first lens to the tenth lens, respectively.
5. The optical imaging lens matched with a liquid lens as claimed in claim 2, wherein: the ninth lens and the tenth lens are cemented to each other.
6. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: the BFL/TTL is more than or equal to 0.12, wherein the BFL is the distance between the image side surface of the tenth lens and the imaging surface on the optical axis, and the TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
7. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: d22/TTL is less than or equal to 0.2, wherein d22 is the lens caliber of the image side surface of the second lens, and TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
8. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: | -f 2/f ≦ 1.5 more than or equal to 0.5, and ≦ f8/f ≦ 2, where f2 is the focal length of the second lens element, f8 is the focal length of the eighth lens element, and f is the focal length of the lens element.
9. The optical imaging lens matched with a liquid lens of claim 2, wherein the optical imaging lens further satisfies: | vd3-vd4 | > 10, | vd6-vd7 | 20, | vd9-vd10 | 20, where vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, vd6 is the abbe number of the sixth lens, vd7 is the abbe number of the seventh lens, vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens.
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| CN202011160925.4A CN113419325A (en) | 2020-10-27 | 2020-10-27 | Optical imaging lens matched with liquid lens |
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| CN202011160925.4A CN113419325A (en) | 2020-10-27 | 2020-10-27 | Optical imaging lens matched with liquid lens |
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| DE10353563A1 (en) * | 2003-11-14 | 2005-06-30 | Jos. Schneider Optische Werke Gmbh | Projecting lens system for projecting digital image data has an arrangement of eleven positive and negative lenses with a shortened overall focal length |
| JP2011133599A (en) * | 2009-12-24 | 2011-07-07 | Sony Corp | Optical unit and imaging apparatus |
| CN109358465A (en) * | 2018-12-11 | 2019-02-19 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
| CN111123483A (en) * | 2020-01-21 | 2020-05-08 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN213091995U (en) * | 2020-10-27 | 2021-04-30 | 厦门力鼎光电股份有限公司 | Optical imaging lens matched with liquid lens |
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| DE10353563A1 (en) * | 2003-11-14 | 2005-06-30 | Jos. Schneider Optische Werke Gmbh | Projecting lens system for projecting digital image data has an arrangement of eleven positive and negative lenses with a shortened overall focal length |
| JP2011133599A (en) * | 2009-12-24 | 2011-07-07 | Sony Corp | Optical unit and imaging apparatus |
| CN109358465A (en) * | 2018-12-11 | 2019-02-19 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
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