CN111948789B - Optical imaging lens matched with liquid lens - Google Patents
Optical imaging lens matched with liquid lens Download PDFInfo
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- CN111948789B CN111948789B CN202010964556.8A CN202010964556A CN111948789B CN 111948789 B CN111948789 B CN 111948789B CN 202010964556 A CN202010964556 A CN 202010964556A CN 111948789 B CN111948789 B CN 111948789B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000003384 imaging method Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
- 230000014509 gene expression Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000035945 sensitivity 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
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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
-
- 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
- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/19—Sensors therefor
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- Optics & Photonics (AREA)
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- Ophthalmology & Optometry (AREA)
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- Lenses (AREA)
Abstract
The invention relates to the technical field of lenses. The invention discloses an optical imaging lens matched with a liquid lens, which sequentially comprises a first lens, a second lens, a diaphragm, a liquid lens, a fifth lens, a seventh lens, a third lens, a fourth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens and the second lens have positive refractive index, the object side is a convex surface, the third lens has negative refractive index, the image side is a concave surface, the fourth lens is a convex flat or convex-concave lens with positive refractive index, the fifth lens has negative refractive index, the object side is a concave surface or a plane, the sixth lens is a concave-convex lens with negative refractive index, and the seventh lens has positive refractive index and the object side is a convex surface. The invention has the advantages of considering the parameters of resolution, depth of field, magnification and the like, along with wide range of working object distance, higher resolution, good imaging quality, large light transmission and high production yield.
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 science and technology and the continuous development of society, in recent years, an optical imaging lens has also been rapidly developed, and the optical imaging lens is 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 for the optical imaging lens are also higher and higher.
However, there are many disadvantages in the optical imaging lens with liquid lens for iris recognition in the market at present, such as that the light transmission is far from the ideal light transmission value required by the application; the relative illuminance is limited by the liquid lens, and the relative illuminance is poor; parameters such as resolution, depth of field, magnification and the like cannot be considered, the identification range is limited, and the object to be detected can be identified when being positioned in a specified small range; poor production yield, etc., cannot meet the increasingly higher requirements, and improvement is urgently needed.
Disclosure of Invention
The present invention is directed to an optical imaging lens with a liquid lens for solving the above-mentioned technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: an optical imaging lens matched with a liquid lens sequentially comprises a first lens, a fourth lens, a diaphragm, the liquid lens, a fifth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has positive refractive index, and the object side surface of the first lens is a convex surface;
the second lens has positive refractive index, and the object side surface of the second lens is a convex surface;
the third lens has negative refractive index, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a plane or concave surface;
The fifth lens has negative refractive index, and the object side surface of the fifth lens is a concave surface or a plane;
the sixth lens element has negative refractive power, wherein the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element is convex;
The seventh lens has positive refractive index; the object side surface of the seventh lens is a convex surface.
Further, the optical lens assembly further comprises an eighth lens element disposed between the fifth lens element and the sixth lens element, wherein the eighth lens element has a positive refractive power, an object-side surface of the eighth lens element is a concave surface, and an image-side surface of the eighth lens element is a convex surface.
Further, the refractive index of the first lens is larger than that of the second lens, the refractive index of the third lens is larger than that of the second lens and that of the fourth lens, the refractive index of the eighth lens is larger than that of the fifth lens and that of the sixth lens, and the refractive index of the seventh lens is larger than that of the sixth lens.
Further, the third lens and the fourth lens are glued to each other.
Further, the second lens and the third lens are cemented with each other.
Further, the optical imaging lens further satisfies: 1.1< f1/f <1.3,0.8< f8/f <1.0, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f8 is the focal length of the eighth lens.
Further, the optical imaging lens further satisfies: phi 234/phi is more than or equal to 1.5, wherein phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens.
Further, the optical imaging lens further satisfies: TTL < 1.25f, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens further satisfies: g45>15mm, wherein G45 is the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens.
The beneficial technical effects of the invention are as follows:
The invention gives consideration to parameters such as resolution, depth of field, magnification and the like, has wide working distance, and is used for realizing noninductive passing without locating an identification object in a specific small range when being used for iris identification; the resolution is high, and the imaging quality is good; the light transmission is larger, and the relative illuminance is higher; high yield (up to 80%).
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF for infrared 0.7800-0.8500 μm at a working object distance of 1000mm in accordance with an embodiment of the present invention;
FIG. 3 is a graph of MTF for infrared 0.7800-0.8500 μm at an 800mm working object distance according to an embodiment of the present invention;
FIG. 4 is a graph of MTF for infrared 0.7800-0.8500 μm at 13000mm working distance according to one embodiment of the present invention;
FIG. 5 is a graph of infrared 0.7800-0.8500 μm defocus for a 1000mm working object distance in accordance with one embodiment of the present invention;
FIG. 6 is a schematic diagram of curvature of field and distortion;
FIG. 7 is a schematic diagram of a second embodiment of the present invention;
FIG. 8 is a graph of MTF for infrared 0.7800-0.8500 μm at a 1300mm working distance according to example two of the present invention;
FIG. 9 is a graph of MTF for infrared 0.7800-0.8500 μm at a working object distance of 800mm for example II of the present invention;
FIG. 10 is a graph of MTF for infrared 0.7800-0.8500 μm at a working object distance of 2000mm for example of the present invention;
FIG. 11 is a graph of infrared 0.7800-0.8500 μm defocus for a 1300mm working object distance of the second embodiment of the present invention;
FIG. 12 is a diagram illustrating curvature of field and distortion in accordance with a second embodiment of the present invention;
FIG. 13 is a schematic diagram of a third embodiment of the present invention;
FIG. 14 is an MTF plot of infrared 0.7800-0.8500 μm for a third 1300mm working object distance according to the present invention;
FIG. 15 is an MTF plot of infrared 0.7800-0.8500 μm for a three 800mm working object distance according to an embodiment of the present invention;
FIG. 16 is an MTF plot of infrared 0.7800-0.8500 μm for a three 2000mm working object distance according to an embodiment of the present invention;
FIG. 17 is a plot of infrared 0.7800-0.8500 μm defocus for a third 1300mm working object distance of an embodiment of the present invention;
FIG. 18 is a diagram illustrating curvature of field and distortion for a third embodiment of the present invention;
FIG. 19 is a schematic view of a fourth embodiment of the present invention;
FIG. 20 is an MTF plot of infrared 0.7800-0.8500 μm for a 1000mm working object distance according to an embodiment of the present invention;
FIG. 21 is an MTF plot of infrared 0.7800-0.8500 μm for a 500mm working object distance according to an example of the present invention;
FIG. 22 is a graph of MTF for infrared 0.7800-0.8500 μm at a working object distance of 1500mm for example four according to the present invention;
FIG. 23 is a graph of infrared 0.7800-0.8500 μm defocus for a 1300mm working object distance of an embodiment of the present invention;
FIG. 24 is a diagram illustrating curvature of field and distortion;
FIG. 25 is a schematic diagram of a fifth embodiment of the present invention;
FIG. 26 is an MTF plot of infrared 0.7800-0.8500 μm for a five 1000mm working object distance according to an embodiment of the present invention;
FIG. 27 is an MTF plot of infrared 0.7800-0.8500 μm for a five 500mm working object distance according to an embodiment of the present invention;
FIG. 28 is an MTF plot of infrared 0.7800-0.8500 μm for a fifth 1500mm working object distance in accordance with the present invention;
FIG. 29 is a graph of infrared 0.7800-0.8500 μm defocus for a fifth 1300mm working object distance of the present invention;
Fig. 30 is a diagram illustrating curvature of field and distortion in accordance with a fifth embodiment of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" as used herein means that the paraxial refractive index of the lens 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 surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (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 the lens data table (LENS DATA SHEET) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined 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 diaphragm, a liquid lens, a fifth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and passing the imaging light beam and an image side surface facing the image side and passing the imaging light beam.
The first lens has positive refractive index, and the object side surface of the first lens is a convex surface.
The second lens has positive refractive index, and the object side surface of the second lens is a convex surface.
The third lens has negative refractive power, and the image side surface of the third lens is a concave surface.
The fourth lens element has positive refractive index, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is planar or concave.
The fifth lens has negative refractive index, and the object side surface of the fifth lens is a concave surface or a plane.
The sixth lens element has negative refractive power, wherein an object-side surface of the sixth lens element is concave, and an image-side surface of the sixth lens element is convex.
The seventh lens has positive refractive index; the object side surface of the seventh lens is a convex surface.
The first lens is used for pre-refraction of the system, the second lens, the third lens and the fourth lens form a system for compressing the light height, so that the light beam can pass through the diaphragm and the liquid lens approximately in parallel with the optical axis, the influence of the liquid lens on the sensitivity and the relative illumination of the system is reduced, and the light beam emitted by the liquid lens is expanded by the fifth lens to obtain a larger image height.
The invention gives consideration to parameters such as resolution, depth of field, magnification and the like, has wide working distance, and is used for realizing noninductive passing without locating an identification object in a specific small range when being used for iris identification; the resolution is high, and the imaging quality is good; the light transmission is larger; high yield (up to 80%).
Preferably, the optical lens assembly further comprises an eighth lens element disposed between the fifth lens element and the sixth lens element, wherein the eighth lens element has positive refractive power, the object-side surface of the eighth lens element is concave, and the image-side surface of the eighth lens element is convex, so that the overall performance is further improved.
More preferably, the refractive index of the first lens is larger than that of the second lens, the refractive index of the third lens is larger than that of the second lens and that of the fourth lens, the refractive index of the eighth lens is larger than that of the fifth lens and that of the sixth lens, and the refractive index of the seventh lens is larger than that of the sixth lens, so that aberration and chromatic aberration are further eliminated, and imaging quality is improved.
Preferably, the third lens and the fourth lens are glued mutually, so that the yield and manufacturability are further improved.
More preferably, the second lens and the third lens are glued to each other, thereby further improving the yield and manufacturability.
Preferably, the optical imaging lens further satisfies: 1.1< f1/f <1.3,0.8< f8/f <1.0, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f8 is the focal length of the eighth lens, so that the focal length of the optical imaging lens is about 50 mm.
Preferably, the optical imaging lens further satisfies: phi 234/phi is more than or equal to 1.5, wherein phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens, so that the light transmission is further increased.
Preferably, the optical imaging lens further satisfies: TTL is less than 1.25f, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the focal length of the optical imaging lens, so that the system length of the optical imaging lens is further shortened.
Preferably, the optical imaging lens further satisfies: and G45 is larger than 15mm, wherein the distance from the image side surface of the G45 fourth lens to the object side surface of the fifth lens on the optical axis is convenient for assembling the liquid lens, and the process feasibility is improved.
The optical imaging lens with the liquid lens according to the present invention will be described in detail with reference to the following embodiments.
Example 1
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 1, a second lens 2, a third lens 3, a fourth lens 4, a diaphragm 9, a liquid lens 100, a fifth lens 5, a sixth lens 6, a seventh lens 7, a cover glass 110, and an imaging surface 120; the first lens element 1 to the seventh lens element 7 each include an object side surface facing the object side A1 and passing imaging light and an image side surface facing the image side A2 and passing imaging light.
The first lens element 1 has a positive refractive power, 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, however, in other embodiments, the image-side surface 12 of the first lens element 1 can be concave or planar.
The second lens element 2 has a positive refractive power, the object-side surface 21 of the second lens element 2 is convex, and the image-side surface 22 of the second lens element 2 is concave, however, in other embodiments, the image-side surface 22 of the second lens element 2 can be convex or planar.
The third lens element 3 has a negative refractive power, the object-side surface 31 of the third lens element 3 is concave, and the image-side surface 33 of the third lens element 31 is concave, however, in other embodiments, the object-side surface 31 of the third lens element 3 can be convex or planar.
The fourth lens element 4 has a positive refractive power, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is concave, however, in other embodiments, the image-side surface 42 of the fourth lens element 4 can be planar.
The fifth lens element 5 has a negative refractive power, the object-side surface 51 of the fifth lens element 5 is concave, the image-side surface 52 of the fifth lens element 5 is convex, and the object-side surface 51 of the fifth lens element 5 can be planar, or the image-side surface 52 of the fifth lens element 5 can be concave or planar.
The sixth lens element 6 has a negative refractive power, wherein 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 convex.
The seventh lens 7 has positive refractive power; the object-side surface 71 of the seventh lens element 7 is convex, and the image-side surface 72 of the seventh lens element 7 is convex, however, in other embodiments, the image-side surface 72 of the seventh lens element 7 may be concave.
The liquid lens 100 adopts the existing liquid lens, and the specific structure can refer to the prior art, which will not be described in detail.
The detailed optical data of this particular example are shown in Table 1-1.
Table 1-1 detailed optical data for example one
The values of the related conditional expressions of this embodiment are shown in table 6.
The MTF transfer function graphs of different working object distances in this embodiment are shown in fig. 2, 3 and 4, and it can be seen that the working object distance range is wide, and the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field, magnification and the like are considered; the defocus graph is shown in fig. 5, and it can be seen that the imaging quality is better; referring to fig. 6 (a) and (B), it can be seen that the curvature of field and distortion are small, and the distortion amount is less than 1.9%.
In this embodiment, the focal length f=53.0 mm of the optical imaging lens; aperture value fno=3.5; field angle FOV = 15.6 °; image plane size = 16.0mm; the distance ttl= 56.85mm on the optical axis I from the object side surface 11 to the imaging surface 120 of the first lens 1.
Example two
As shown in fig. 7, 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 1, a second lens 2, a third lens 3, a fourth lens 4, a diaphragm 9, a liquid lens 100, a fifth lens 5, an eighth lens 8, a sixth lens 6, a seventh lens 7, a cover glass 110, and an imaging surface 120; the first lens element 1 to the eighth lens element 8 each comprise an object side surface facing the object side A1 and allowing the imaging light to pass therethrough, and an image side surface facing the image side A2 and allowing the imaging light to pass therethrough.
The first lens element 1 has a positive refractive power, 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 concave, however, in other embodiments, the image-side surface 12 of the first lens element 1 can be convex or planar.
The second lens element 2 has a positive refractive power, the object-side surface 21 of the second lens element 2 is convex, and the image-side surface 22 of the second lens element 2 is planar, however, in other embodiments, the image-side surface 22 of the second lens element 2 can be convex or concave.
The third lens element 3 has a negative refractive power, the object-side surface 31 of the third lens element 3 is planar, and the image-side surface 33 of the third lens element 31 is concave, however, in other embodiments, the object-side surface 31 of the third lens element 3 can be convex or concave.
The fourth lens element 4 has a positive refractive power, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is concave, however, in other embodiments, the image-side surface 42 of the fourth lens element 4 can be planar.
The fifth lens element 5 has a negative refractive power, the object-side surface 51 of the fifth lens element 5 is concave, the image-side surface 52 of the fifth lens element 5 is concave, and the object-side surface 51 of the fifth lens element 5 can be planar, or the image-side surface 52 of the fifth lens element 5 can be convex or planar in other embodiments.
The eighth lens element 8 has a positive refractive power, wherein an object-side surface 81 of the eighth lens element 8 is concave, and an image-side surface 82 of the eighth lens element 8 is convex.
The sixth lens element 6 has a negative refractive power, wherein 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 convex.
The seventh lens 7 has positive refractive power; the object side surface 71 of the seventh lens element 7 is convex, and the image side surface 72 of the seventh lens element 7 is concave.
In this embodiment, the third lens 3 and the fourth lens 4 are glued to each other.
The liquid lens 100 adopts the existing liquid lens, and the specific structure can refer to the prior art, which will not be described in detail.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
The values of the related conditional expressions of this embodiment are shown in table 6.
The MTF transfer function graphs of different working object distances in this embodiment are shown in fig. 8, 9 and 10, and it can be seen that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and the parameters such as resolution, depth of field, magnification and the like are considered; the defocus graph is shown in fig. 11, and it can be seen that the imaging quality is better; referring to fig. 12 (a) and (B), it can be seen that the curvature of field and distortion are small, and the distortion amount is less than 1.0%.
The imaging quality of this embodiment is better than that of embodiment one.
In this embodiment, the focal length f=50.5 mm of the optical imaging lens; aperture value fno=3.8; field angle FOV = 16.8 °; image plane size = 16.0mm; the distance ttl=53.90 mm on the optical axis I from the object side surface 11 to the imaging surface 120 of the first lens 1.
Example III
As shown in fig. 13, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the second embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different. Furthermore, in the present embodiment, the second lens 2 and the third lens 3 are cemented with each other, and the third lens 3 and the fourth lens 4 are cemented with each other.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
The values of the related conditional expressions of this embodiment are shown in table 6.
The MTF transfer function graphs of different working object distances in this embodiment are shown in fig. 14, 15 and 16, and it can be seen that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocus graph is shown in fig. 17, and it can be seen that the imaging quality is better; referring to fig. 18 (a) and (B), it can be seen that the curvature of field and distortion are small, and the distortion amount is less than 0.9%.
In this embodiment, the focal length f=50.7mm of the optical imaging lens; aperture value fno=3.8; field angle FOV = 16.7 °; image plane size = 16.0mm; the distance ttl= 54.92mm on the optical axis I from the object side surface 11 to the imaging surface 120 of the first lens 1.
Example IV
As shown in fig. 19, in this embodiment, the surface roughness and refractive index of each lens element are substantially the same as those of the third embodiment, and only the image side 12 of the first lens element 1 is a plane, the image side 22 of the second lens element 2 is a concave surface, the object side 31 of the third lens element 3 is a convex surface, the object side 51 of the fifth lens element 5 is a plane, and the optical parameters such as the radius of curvature and the lens thickness of each lens element surface are different.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example four
The values of the related conditional expressions of this embodiment are shown in table 6.
The MTF transfer function graphs of different working object distances in this embodiment are shown in fig. 20, 21 and 22, and it can be seen that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocus graph is shown in fig. 23, and it can be seen that the imaging quality is better; referring to fig. 24 (a) and (B), it can be seen that the curvature of field and distortion are small, and the distortion amount is less than 2.50%.
In this embodiment, the focal length f=50.0 mm of the optical imaging lens; aperture value fno=3.5; field angle fov=16.3 °; image plane size = 16.0mm; the distance ttl= 55.87mm on the optical axis I from the object side surface 11 to the imaging surface 120 of the first lens 1.
Example five
As shown in fig. 25, in this embodiment, the surface irregularities and refractive index of the respective lenses are substantially the same as those of the fourth embodiment, and only the object side surface 51 of the fifth lens element 5 is concave, the image side surface 72 of the seventh lens element 7 is convex, and the optical parameters such as the radius of curvature and the lens thickness of the respective lens surfaces are also different.
The detailed optical data of this particular example are shown in Table 5-1.
Table 5-1 detailed optical data for example five
The values of the related conditional expressions of this embodiment are shown in table 6.
The MTF transfer function graphs of different working object distances in this embodiment are shown in fig. 26, 27 and 28, and it can be seen that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocus graph is shown in fig. 29, and it can be seen that the imaging quality is better; referring to fig. 30 (a) and (B), it can be seen that the curvature of field and distortion are small, and the distortion amount is less than 2.50%.
In this embodiment, the focal length f=55.0 mm of the optical imaging lens; aperture value fno=3.5; field angle FOV = 14.7 °; image plane size = 16.0mm; the distance ttl=59.84 mm on the optical axis I from the object side surface 11 to the imaging surface 120 of the first lens 1.
TABLE 6 values of relevant important parameters for five embodiments of the invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | Fifth embodiment | |
| f1/f | 1.12 | 1.14 | 1.28 | 1.22 | 1.17 |
| f8/f | 0.93 | 0.92 | 0.93 | 0.82 | 0.83 |
| Φ234 | 0.003 | 0.003 | 0.006 | 0.006 | 0.005 |
| Φ | 0.020 | 0.020 | 0.020 | 0.018 | 0.019 |
| Φ234/Φ | 0.15 | 0.17 | 0.29 | 0.31 | 0.27 |
| TTL | 53.90 | 54.92 | 55.87 | 59.84 | 56.85 |
| 1.25f | 63.125 | 63.375 | 62.5 | 68.75 | 66.25 |
| G45 | 16.99 | 16.73 | 17.68 | 17.72 | 17.79 |
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 details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An optical imaging lens matched with a liquid lens is characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a liquid lens, a fifth lens and a seventh lens, which are sequentially arranged from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has positive refractive index, and the object side surface of the first lens is a convex surface;
the second lens has positive refractive index, and the object side surface of the second lens is a convex surface;
the third lens has negative refractive index, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a plane or concave surface;
The fifth lens has negative refractive index, and the object side surface of the fifth lens is a concave surface or a plane;
the sixth lens element has negative refractive power, wherein the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element is convex;
the seventh lens has positive refractive index; the object side surface of the seventh lens is a convex surface;
The optical imaging lens has no more than eight lenses with refractive index, and the optical imaging lens meets the following conditions: 1.1< f1/f <1.3,0.8< f8/f <1.0, phi 234/phi is not less than 1.5, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, f8 is the focal length of the eighth lens, phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens.
2. The optical imaging lens with the liquid lens as claimed in claim 1, wherein: the optical lens assembly further comprises an eighth lens, wherein the eighth lens is arranged between the fifth lens and the sixth lens, the eighth lens has positive refractive index, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface.
3. The optical imaging lens with the liquid lens according to claim 2, wherein: the refractive index of the first lens is larger than that of the second lens, the refractive index of the third lens is larger than that of the second lens and that of the fourth lens, the refractive index of the eighth lens is larger than that of the fifth lens and that of the sixth lens, and the refractive index of the seventh lens is larger than that of the sixth lens.
4. The optical imaging lens with the liquid lens according to claim 1 or 2, wherein: the third lens and the fourth lens are glued to each other.
5. The optical imaging lens with the liquid lens as claimed in claim 4, wherein: the second lens and the third lens are cemented with each other.
6. The optical imaging lens with the liquid lens according to claim 1 or 2, wherein the optical imaging lens further satisfies: TTL < 1.25f, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.
7. The optical imaging lens with the liquid lens according to claim 1 or 2, wherein the optical imaging lens further satisfies: g45>15mm, wherein G45 is the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens.
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