CN114859517B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
- Publication number
- CN114859517B CN114859517B CN202210591901.7A CN202210591901A CN114859517B CN 114859517 B CN114859517 B CN 114859517B CN 202210591901 A CN202210591901 A CN 202210591901A CN 114859517 B CN114859517 B CN 114859517B
- Authority
- CN
- China
- Prior art keywords
- lens
- lens group
- group
- cemented
- fixed focus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 80
- 239000011521 glass Substances 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 abstract description 26
- 230000004075 alteration Effects 0.000 description 42
- 239000000463 material Substances 0.000 description 16
- 238000003384 imaging method Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a fixed focus lens, which comprises nine lenses sequentially arranged from an object plane to an image plane along an optical axis, wherein the nine lenses form a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens group sequentially arranged from the object plane to the image plane along the optical axis, and at least two lens groups are cemented lens groups, wherein the first lens group has positive focal power, and the second lens group has positive focal power. According to the fixed-focus lens provided by the embodiment of the invention, nine lenses are divided into six lens groups, at least two lens groups are glued lens groups, and meanwhile, the focal power of each lens group is reasonably set, so that the fixed-focus lens has the characteristics of large aperture and large image surface under wide spectrum application and meets the application requirement of wide spectrum while meeting the requirements of good quality.
Description
Technical Field
The invention relates to the technical field of optical devices, in particular to a fixed-focus lens.
Background
With the progress of industry, the requirements on the performance of the lens are also increasing, and the design of a lens with large aperture, large image plane and wide spectrum becomes a market development trend.
However, the existing wide spectrum lens has the defects of low pixel, more noise points, small image surface and the like in a low-illumination environment, and cannot meet the application requirements.
Disclosure of Invention
The invention provides a fixed-focus lens, which meets the requirements of good quality and simultaneously realizes wide spectrum, large aperture and large image plane.
The invention provides a fixed focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
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 form a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, and a sixth lens group that are sequentially arranged from an object plane to an image plane along an optical axis;
each of the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group, and the sixth lens group includes at least one lens, and at least two lens groups are cemented lens groups;
wherein the first lens group has positive optical power, the second lens group has positive optical power, the third lens group has negative optical power, the fourth lens group has positive optical power, the fifth lens group has positive optical power, and the sixth lens group has negative optical power;
alternatively, the first lens group has positive optical power, the second lens group has positive optical power, the third lens group has positive optical power, the fourth lens group has negative optical power, the fifth lens group has positive optical power, and the sixth lens group has positive optical power;
alternatively, the first lens group has positive power, the second lens group has positive power, the third lens group has negative power, the fourth lens group has positive power, the fifth lens group has negative power, and the sixth lens group has positive power.
Optionally, the first lens group includes the first lens;
the second lens group is a cemented lens group, and the second lens group includes the cemented second lens, the third lens, and the fourth lens;
the third lens group includes the fifth lens;
the fourth lens group includes the sixth lens;
the fifth lens group includes the seventh lens;
the sixth lens group is a cemented lens group, and the sixth lens group includes the eighth lens and the ninth lens cemented.
Optionally, the first lens group includes the first lens;
the second lens group includes the second lens;
the third lens group is a cemented lens group, and the third lens group includes the cemented third lens and the fourth lens;
the fourth lens group includes the fifth lens;
the fifth lens group includes the sixth lens;
the sixth lens group is a cemented lens group, and the sixth lens group includes the seventh lens, the eighth lens, and the ninth lens cemented.
Optionally, the first lens group is a cemented lens group, and the first lens group includes the cemented first lens and the second lens;
the second lens group is a cemented lens group, and the second lens group includes the cemented third lens and the fourth lens;
the third lens group includes the fifth lens;
the fourth lens group includes the sixth lens;
the fifth lens group includes the seventh lens;
the sixth lens group is a cemented lens group, and the sixth lens group includes the eighth lens and the ninth lens cemented.
Optionally, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface or a concave surface;
the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface or a concave surface;
the object side surface of the third lens is a concave surface or a convex surface, and the image side surface of the third lens is a convex surface or a concave surface;
the object side surface of the fourth lens is a concave surface or a convex surface, and the image side surface of the fourth lens is a concave surface;
the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the object side surface of the sixth lens is a convex surface or a concave surface, and the image side surface of the sixth lens is a concave surface or a convex surface;
the object side surface of the seventh lens is a convex surface or a concave surface, and the image side surface of the seventh lens is a convex surface or a concave surface;
the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface or a concave surface.
Optionally, the focal power of the first lens isThe focal power of the second lens is +.>The third lens has optical power of +>The focal power of the fourth lens is +.>The focal power of the fifth lens is +.>The focal power of the sixth lens is +.>The focal power of the seventh lens is +.>The focal power of the eighth lens is +.>The optical power of the ninth lens is +.>The focal power of the fixed focus lens is +.>Wherein:
optionally, the refractive index of the first lens is n1, and the abbe number of the first lens is v1; the refractive index of the second lens is n2, and the Abbe number of the second lens is v2; the refractive index of the third lens is n3, and the Abbe number of the third lens is v3; the refractive index of the fourth lens is n4, and the Abbe number of the fourth lens is v4; the refractive index of the fifth lens is n5, and the Abbe number of the fifth lens is v5; the refractive index of the sixth lens is n6, and the Abbe number of the sixth lens is v6; the refractive index of the seventh lens is n7, and the Abbe number of the seventh lens is v7; the refractive index of the eighth lens is n8, and the Abbe number of the eighth lens is v8; the refractive index of the ninth lens is n9, and the Abbe number of the ninth lens is v9; wherein:
1.40≤n1≤1.54；56.47≤v1≤95.00；1.43≤n2≤1.97；50.01≤v2≤95.00；
1.53≤n3≤1.88；28.42≤v3≤56.00；1.61≤n4≤1.99；29.00≤v4≤51.84；
1.48≤n5≤1.79；28.82≤v5≤42.94；1.85≤n6≤2.05；22.00≤v6≤33.61；
1.62≤n7≤2.05；19.00≤v7≤31.00；1.65≤n8≤2.05；30.22≤v8≤46.00；
1.59≤n9≤2.05；19.00≤v9≤61.00。
optionally, the image plane diameter of the fixed focus lens is IC, and the total length of the fixed focus lens is TTL, wherein IC/TTL is more than or equal to 0.183.
Optionally, the fixed focus lens further comprises a diaphragm;
the diaphragm is positioned on one side of the object side surface of the first lens.
Optionally, 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 are all glass lenses.
According to the fixed-focus lens provided by the embodiment of the invention, 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 are sequentially arranged from the object side to the image side along the optical axis, the nine lenses are divided into six lens groups, at least two lens groups are glued lens groups, so that chromatic aberration is reduced to the greatest extent or eliminated, meanwhile, the focal power of each lens group is reasonably arranged, the mutual matching of the lens groups is ensured, clear imaging is realized, and meanwhile, the fixed-focus lens has the characteristics of large aperture and large image surface under wide spectrum application, and the application requirement of wide spectrum is met.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent 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 structural diagram of a fixed focus lens according to an embodiment of the present invention;
FIG. 2 is a graph of spherical aberration of the fixed focus lens of FIG. 1;
FIG. 3 is a graph of chromatic aberration of the fixed focus lens shown in FIG. 1;
fig. 4 is a schematic structural diagram of another fixed focus lens according to an embodiment of the present invention;
FIG. 5 is a graph of spherical aberration of the fixed focus lens of FIG. 4;
FIG. 6 is a graph of chromatic aberration of the fixed focus lens shown in FIG. 4;
fig. 7 is a schematic structural diagram of another fixed focus lens according to an embodiment of the present invention;
FIG. 8 is a graph of spherical aberration of the fixed focus lens of FIG. 7;
fig. 9 is a color difference graph of the fixed focus lens shown in fig. 7.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention, as shown in fig. 1, the fixed focus lens according to an embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a ninth lens 190, which are sequentially arranged along an optical axis from an object plane to an image plane. The first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, the eighth lens 180, and the ninth lens 190 form a first lens group 210, a second lens group 220, a third lens group 230, a fourth lens group 240, a fifth lens group 250, and a sixth lens group 260, which are sequentially arranged from an object plane to an image plane along an optical axis. Each of the first lens group 210, the second lens group 220, the third lens group 230, the fourth lens group 240, the fifth lens group 250, and the sixth lens group 260 includes at least one lens, and at least two lens groups are cemented lens groups. Wherein the first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has negative power, the fourth lens group 240 has positive power, the fifth lens group 250 has positive power, and the sixth lens group 260 has negative power. Alternatively, the first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has positive power, the fourth lens group 240 has negative power, the fifth lens group 250 has positive power, and the sixth lens group 260 has positive power. Alternatively, the first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has negative power, the fourth lens group 240 has positive power, the fifth lens group 250 has negative power, and the sixth lens group 260 has positive power.
The focal power is equal to the difference between the convergence of the image side light beam and the convergence of the object side light beam, and the focal power characterizes the light ray deflection capability of the optical system. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group).
In this embodiment, each lens may be fixed in a lens barrel (not shown in fig. 1), and by dividing nine lenses into six lens groups, and at least two lens groups are two lenses or a cemented lens group composed of three lenses, chromatic aberration may be reduced or eliminated to the greatest extent, so that various aberrations of the fixed focus lens may be sufficiently corrected, and under the premise of compact structure, optical performance such as resolution may be improved, distortion may be optimized, and light loss caused by reflection between lenses may be reduced, and illuminance may be improved, thereby improving image quality, improving definition of lens imaging, and ensuring good imaging quality under broad spectrum application at a wavelength of about 400nm to 1000 nm.
Meanwhile, through reasonably setting the focal power of each lens group, the mutual matching of each lens group is ensured, clear imaging is realized, the focal power of the whole fixed focus lens is distributed according to a certain proportion, the uniformity of the incident angle of the front lens group and the rear lens group can be ensured, the sensitivity of the lens is reduced, and the possibility of production is improved.
The fixed focus lens provided by the embodiment of the invention can reach F1.2 under the wide spectrum application of 400-1000 nm, and can be matched with a 1/1.8' target surface sensor chip at maximum, thereby having the characteristics of large aperture and large image surface and meeting the use requirement of wide spectrum.
In summary, in the fixed focus lens provided by the embodiment of the invention, 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 are sequentially arranged from the object side to the image side along the optical axis, the nine lenses are divided into six lens groups, at least two lens groups are cemented lens groups, so as to reduce chromatic aberration or eliminate chromatic aberration to the greatest extent, and meanwhile, the focal power of each lens group is reasonably arranged, so that the mutual matching of the lens groups is ensured, clear imaging is realized, and meanwhile, the fixed focus lens has the characteristics of large aperture and large image plane under wide spectrum application, and the application requirement of wide spectrum is met.
With continued reference to fig. 1, optionally, the first lens group 210 includes a first lens 110; the second lens group 220 is a cemented lens group, and the second lens group 220 includes a cemented second lens 120, a third lens 130, and a fourth lens 140; the third lens group 230 includes a fifth lens 150; the fourth lens group 240 includes a sixth lens 160; the fifth lens group 250 includes a seventh lens 170; the sixth lens group 260 is a cemented lens group 180, and the sixth lens group 260 includes a cemented eighth lens 180 and a ninth lens 190.
Wherein, by arranging the second lens 120, the third lens 130 and the fourth lens 140 to form a triple cemented lens group, and the eighth lens 180 and the ninth lens 190 to form a double cemented lens group, the air space between the second lens 120, the third lens 130 and the fourth lens 140, and between the eighth lens 180 and the ninth lens 190 can be effectively reduced, thereby reducing the total lens length. In addition, the cemented lens group can furthest reduce chromatic aberration or eliminate chromatic aberration, so that various aberrations of the fixed focus lens can be sufficiently corrected, on the premise of compact structure, the resolution can be improved, the optical properties such as distortion and the like can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illuminance can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, the use of the cemented lens assembly can also reduce assembly components between lenses, simplify assembly procedures in the lens manufacturing process, reduce cost, and reduce tolerance sensitivity problems of lens units due to tilting/decentering and the like generated in the assembly process.
Optionally, the first lens group 210 includes a first lens 110; the second lens group 220 includes a second lens 120; the third lens group 230 is a cemented lens group, and the third lens group 230 includes the cemented third lens 130 and the fourth lens 140; the fourth lens group 240 includes a fifth lens 150; the fifth lens group 250 includes a sixth lens 160; the sixth lens group 260 is a cemented lens group, and the sixth lens group 260 includes a cemented seventh lens 170, an eighth lens 180, and a ninth lens 190.
Wherein, by providing the third lens 130 and the fourth lens 140 to constitute a double cemented lens group, and the seventh lens 170, the eighth lens 180, and the ninth lens 190 to constitute a triple cemented lens group, an air space between the third lens 130 and the fourth lens 140, and between the seventh lens 170, the eighth lens 180, and the ninth lens 190 can be effectively reduced, thereby reducing a total lens length. In addition, the cemented lens group can furthest reduce chromatic aberration or eliminate chromatic aberration, so that various aberrations of the fixed focus lens can be sufficiently corrected, on the premise of compact structure, the resolution can be improved, the optical properties such as distortion and the like can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illuminance can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, the use of the cemented lens assembly can also reduce assembly components between lenses, simplify assembly procedures in the lens manufacturing process, reduce cost, and reduce tolerance sensitivity problems of lens units due to tilting/decentering and the like generated in the assembly process.
Optionally, the first lens group 210 is a cemented lens group, and the first lens group 210 includes a cemented first lens 110 and a second lens 120; the second lens group 220 is a cemented lens group, and the second lens group 220 includes a cemented third lens 130 and a fourth lens 140; the third lens group 230 includes a fifth lens 150; the fourth lens group 240 includes a sixth lens 160; the fifth lens group 250 includes a seventh lens 170; the sixth lens group 260 is a cemented lens group, and the sixth lens group 260 includes a cemented eighth lens 180 and a ninth lens 190.
Wherein, by providing the first lens 110 and the second lens 120 to constitute a cemented doublet lens group, the third lens 130 and the fourth lens 140 to constitute a cemented doublet lens group, and the eighth lens 180 and the ninth lens 190 to constitute a cemented doublet lens group, air intervals between the first lens 110 and the second lens 120, between the third lens 130 and the fourth lens 140, and between the eighth lens 180 and the ninth lens 190 can be effectively reduced, thereby reducing the total lens length. In addition, the cemented lens group can furthest reduce chromatic aberration or eliminate chromatic aberration, so that various aberrations of the fixed focus lens can be sufficiently corrected, on the premise of compact structure, the resolution can be improved, the optical properties such as distortion and the like can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illuminance can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, the use of the cemented lens assembly can also reduce assembly components between lenses, simplify assembly procedures in the lens manufacturing process, reduce cost, and reduce tolerance sensitivity problems of lens units due to tilting/decentering and the like generated in the assembly process.
Optionally, the object side of the first lens element 110 is convex, and the image side of the first lens element 110 is convex or concave; the object side of the second lens element 120 is convex, and the image side of the second lens element 120 is convex or concave; the object side surface of the third lens element 130 is concave or convex, and the image side surface of the third lens element 130 is convex or concave; the fourth lens element 140 has a concave or convex object-side surface, and the fourth lens element 140 has a concave image-side surface; the object side surface of the fifth lens element 150 is concave, and the image side surface of the fifth lens element 150 is concave; the object-side surface of the sixth lens element 160 is convex or concave, and the image-side surface of the sixth lens element 160 is concave or convex; the object side surface of the seventh lens element 170 is convex or concave, and the image side surface of the seventh lens element 170 is convex or concave; the object side surface of the eighth lens element 180 is convex, and the image side surface of the eighth lens element 180 is concave; the object-side surface of the ninth lens element 190 is convex, and the image-side surface of the ninth lens element 190 is convex or concave.
The surface type of each lens is reasonably arranged, the focal power of each lens meets the focal power requirement in the embodiment, and meanwhile, the aperture and the image surface in wide spectrum application are further optimized, so that the fixed-focus lens has the characteristics of a large aperture and a large image surface, meanwhile, the whole fixed-focus lens can be compact in structure, high in integration level and beneficial to achieving miniaturized application.
Optionally, the first lens 110 has an optical power ofThe second lens 120 has an optical power of +.>The third lens 130 has an optical power of +>The fourth lens 140 has an optical power of +>The optical power of the fifth lens 150 is +.>The optical power of the sixth lens 160 is +.>The seventh lens 170 has optical power +.>The optical power of the eighth lens 180 is +.>The optical power of the ninth lens 190 is +.>The focal power of the fixed focus lens is +.>Wherein:
the focal power of each lens is reasonably set, so that the focal power of each lens meets the focal power requirements in the embodiment, better aberration correction is facilitated, and the definition of the fixed focus lens in wide spectrum application is ensured.
Alternatively, the refractive index of the first lens 110 is n1, and the abbe number of the first lens 110 is v1; the refractive index of the second lens 120 is n2, and the abbe number of the second lens 120 is v2; the refractive index of the third lens 130 is n3, and the abbe number of the third lens 130 is v3; the refractive index of the fourth lens 140 is n4, and the abbe number of the fourth lens 140 is v4; the refractive index of the fifth lens 150 is n5, and the abbe number of the fifth lens 150 is v5; the refractive index of the sixth lens 160 is n6, and the abbe number of the sixth lens 160 is v6; the refractive index of the seventh lens 170 is n7, and the abbe number of the seventh lens 170 is v7; the refractive index of the eighth lens 180 is n8, and the abbe number of the eighth lens 180 is v8; the refractive index of the ninth lens 190 is n9, and the abbe number of the ninth lens 190 is v9; wherein:
1.40≤n1≤1.54；56.47≤v1≤95.00；1.43≤n2≤1.97；50.01≤v2≤95.00；
1.53≤n3≤1.88；28.42≤v3≤56.00；1.61≤n4≤1.99；29.00≤v4≤51.84；
1.48≤n5≤1.79；28.82≤v5≤42.94；1.85≤n6≤2.05；22.00≤v6≤33.61；
1.62≤n7≤2.05；19.00≤v7≤31.00；1.65≤n8≤2.05；30.22≤v8≤46.00；
1.59≤n9≤2.05；19.00≤v9≤61.00。
wherein, the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The abbe number is an index for indicating the dispersion ability of the transparent medium, and the more serious the medium dispersion, the smaller the abbe number; conversely, the more slightly the dispersion of the medium, the greater the Abbe number.
In this embodiment, the refractive index and abbe number of each lens in the fixed focus lens are matched to facilitate the realization of higher pixel resolution and larger aperture in wide spectrum applications.
Optionally, the image plane diameter of the fixed focus lens is IC, and the total length of the fixed focus lens is TTL, wherein IC/TTL is more than or equal to 0.183.
In this embodiment, by reasonably setting the relationship between the image plane diameter IC and the total length TTL of the fixed focus lens, the fixed focus lens can have a larger target surface and a smaller volume, and can maximally match with a 1/1.8″ target surface sensor chip, and can reduce the total length of the lens of the fixed focus lens while ensuring that the optical system has better imaging quality and clearer pictures, thereby realizing miniaturization of the fixed focus lens and facilitating later assembly.
Optionally, the fixed focus lens further includes a diaphragm (not shown in the figure), and the diaphragm is located on the object side surface side of the first lens 110.
The aperture is additionally arranged on one side of the object side surface of the first lens 110, so that the propagation direction of the light beam can be adjusted, the Chief Ray Angle (CRA) can be reduced on the basis of ensuring the aperture size of the optical system, the relative illuminance can be improved, meanwhile, the far-axis light can be blocked, the aberration of the marginal view field can be reduced, and the imaging quality of the fixed focus lens can be further improved.
Optionally, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, the eighth lens 180, and the ninth lens 190 are glass lenses.
The nine lenses are glass lenses, so that sensitivity of the lenses to temperature can be reduced by using glass materials, imaging quality of the lenses at different temperatures is guaranteed, the fixed focus lens has the characteristic of stable high-low temperature performance, environmental adaptability of the fixed focus lens is improved, infrared confocal is realized, and use requirements at the temperature of-40-80 ℃ are met.
It should be noted that, the material of the glass lens is various types of glass known to those skilled in the art, and the embodiment of the present invention is not repeated and limited.
Optionally, f.no. of the fixed focus lens satisfies f.no <1.2.
The F.NO of the fixed-focus lens is smaller than 1.2, so that the ultra-large throughput can be met, and the fixed-focus lens is suitable for imaging requirements under the low-illumination condition.
Based on the above inventive concept, the present invention provides the following three different specific embodiments.
Example 1
As shown in fig. 1, the first lens group 210 includes a first lens 110; the second lens group 220 is a cemented lens group, and the second lens group 220 includes a cemented second lens 120, a third lens 130, and a fourth lens 140; the third lens group 230 includes a fifth lens 150; the fourth lens group 240 includes a sixth lens 160; the fifth lens group 250 includes a seventh lens 170; the sixth lens group 260 is a cemented lens group 180, and the sixth lens group 260 includes a cemented eighth lens 180 and a ninth lens 190. Wherein the first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has negative power, the fourth lens group 240 has positive power, the fifth lens group 250 has positive power, and the sixth lens group 260 has negative power.
Table 1 details specific optical physical parameters of each lens of the fixed focus lens of fig. 1 in one possible embodiment.
Table 1 design values of optical physical parameters of fixed focus lens
Wherein, the surface numbers are numbered according to the surface sequence of each lens, for example, the surface number "S1" represents the object-side surface of the first lens element 110, the surface number "S2" represents the image-side surface of the first lens element 110, and so on; the radius of curvature represents the degree of curvature of the lens surface, positive values represent the curvature of the surface toward the object plane, and negative values represent the curvature of the surface toward the image plane; thickness represents the center axial distance from the current surface to the next surface; material (nd) represents the refractive index, i.e. the ability of the material between the current surface and the next surface to deflect light, and space represents the current position as air, with a refractive index of 1; the material (vd) represents the abbe number, i.e. the dispersive property of the material to light between the current surface and the next surface, and the space represents the current position as air.
Further, fig. 2 is a spherical aberration graph of the fixed focus lens shown in fig. 1, and as shown in fig. 2, spherical aberration of the fixed focus lens under different wavelengths (0.436 μm, 0.486 μm, 0.588 μm, 0.656 μm, 0.850 μm and 0.940 μm) is within 0.1mm, which indicates that axial aberration of the fixed focus lens under a wide spectrum is smaller, and aberration can be corrected well, so that the requirement of wide spectrum application can be met.
FIG. 3 is a graph of chromatic aberration of the fixed focus lens shown in FIG. 1, wherein the vertical direction represents normalization of the field angle, 0 represents on the optical axis, and the vertical direction vertex represents the maximum field radius, as shown in FIG. 3; the horizontal direction is the offset in micrometers (μm) from the reference meridian range of 0.588 μm. The numbers on the graph show the wavelength of the graph in micrometers (mum), and as can be seen from FIG. 5, the vertical axis chromatic aberration can be controlled within (-5μm,1μm), which shows that the chromatic aberration of the fixed focus lens under a wide spectrum is better controlled, and the wide spectrum application requirement can be met.
Example two
Fig. 4 is a schematic structural diagram of another fixed focus lens provided in an embodiment of the present invention, as shown in fig. 4, the fixed focus lens provided in the embodiment of the present invention includes a first lens group 210, a second lens group 220, a third lens group 230, a fourth lens group 240, a fifth lens group 250 and a sixth lens group 260 sequentially arranged from an object plane to an image plane along an optical axis, wherein the first lens group 210 includes a first lens 110; the second lens group 220 includes a second lens 120; the third lens group 230 is a cemented lens group, and the third lens group 230 includes the cemented third lens 130 and the fourth lens 140; the fourth lens group 240 includes a fifth lens 150; the fifth lens group 250 includes a sixth lens 160; the sixth lens group 260 is a cemented lens group, and the sixth lens group 260 includes a cemented seventh lens 170, an eighth lens 180, and a ninth lens 190. The first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has positive power, the fourth lens group 240 has negative power, the fifth lens group 250 has positive power, and the sixth lens group 260 has positive power.
Table 2 details the specific optical physical parameters of the individual lenses of the fixed focus lens of fig. 4 in one possible embodiment.
Table 2 design values of optical physical parameters of fixed focus lens
Wherein, the surface numbers are numbered according to the surface sequence of each lens, for example, the surface number "S1" represents the object-side surface of the first lens element 110, the surface number "S2" represents the image-side surface of the first lens element 110, and so on; the radius of curvature represents the degree of curvature of the lens surface, positive values represent the curvature of the surface toward the object plane, and negative values represent the curvature of the surface toward the image plane; thickness represents the center axial distance from the current surface to the next surface; material (nd) represents the refractive index, i.e. the ability of the material between the current surface and the next surface to deflect light, and space represents the current position as air, with a refractive index of 1; the material (vd) represents the abbe number, i.e. the dispersive property of the material to light between the current surface and the next surface, and the space represents the current position as air.
Further, fig. 5 is a spherical aberration graph of the fixed focus lens shown in fig. 4, and as shown in fig. 5, spherical aberration of the fixed focus lens at different wavelengths (0.436 μm, 0.486 μm, 0.588 μm, 0.656 μm, 0.850 μm and 0.940 μm) is within 0.11mm, which indicates that axial aberration of the fixed focus lens under a wide spectrum is smaller, and aberration can be corrected well, so that the requirement of wide spectrum application can be met.
FIG. 6 is a graph of chromatic aberration of the fixed focus lens shown in FIG. 4, wherein the vertical direction represents normalization of the field angle, 0 represents on the optical axis, and the vertical direction vertex represents the maximum field radius, as shown in FIG. 6; the horizontal direction is the offset in micrometers (μm) from the reference meridian range of 0.588 μm. The numbers on the graph show the wavelength of the graph in micrometers (mum), and as can be seen from FIG. 5, the vertical axis chromatic aberration can be controlled within (-5μm,1μm), which shows that the chromatic aberration of the fixed focus lens under a wide spectrum is better controlled, and the wide spectrum application requirement can be met.
Example III
Fig. 7 is a schematic structural diagram of still another fixed focus lens provided in an embodiment of the present invention, as shown in fig. 7, the fixed focus lens provided in the embodiment of the present invention includes a first lens group 210, a second lens group 220, a third lens group 230, a fourth lens group 240, a fifth lens group 250 and a sixth lens group 260 sequentially arranged from an object plane to an image plane along an optical axis, wherein the first lens group 210 is a cemented lens group, and the first lens group 210 includes a cemented first lens 110 and a second lens 120; the second lens group 220 is a cemented lens group, and the second lens group 220 includes a cemented third lens 130 and a fourth lens 140; the third lens group 230 includes a fifth lens 150; the fourth lens group 240 includes a sixth lens 160; the fifth lens group 250 includes a seventh lens 170; the sixth lens group 260 is a cemented lens group, and the sixth lens group 260 includes a cemented eighth lens 180 and a ninth lens 190. The first lens group 210 has positive power, the second lens group 220 has positive power, the third lens group 230 has negative power, the fourth lens group 240 has positive power, the fifth lens group 250 has negative power, and the sixth lens group 260 has positive power.
Table 3 details the specific optical physical parameters of each lens of the fixed focus lens of fig. 7 in one possible embodiment.
Table 3 design values of optical physical parameters of fixed focus lens
Wherein, the surface numbers are numbered according to the surface sequence of each lens, for example, the surface number "S1" represents the object-side surface of the first lens element 110, the surface number "S2" represents the image-side surface of the first lens element 110, and so on; the radius of curvature represents the degree of curvature of the lens surface, positive values represent the curvature of the surface toward the object plane, and negative values represent the curvature of the surface toward the image plane; thickness represents the center axial distance from the current surface to the next surface; material (nd) represents the refractive index, i.e. the ability of the material between the current surface and the next surface to deflect light, and space represents the current position as air, with a refractive index of 1; the material (vd) represents the abbe number, i.e. the dispersive property of the material to light between the current surface and the next surface, and the space represents the current position as air.
Further, fig. 8 is a spherical aberration graph of the fixed focus lens shown in fig. 7, and as shown in fig. 8, the spherical aberration of the fixed focus lens at different wavelengths (0.436 μm, 0.486 μm, 0.588 μm, 0.656 μm, 0.850 μm and 0.940 μm) is within 0.15mm, which indicates that the axial aberration of the fixed focus lens under a wide spectrum is smaller, the aberration can be corrected better, and the requirement of wide spectrum application can be met.
FIG. 9 is a graph of chromatic aberration of the fixed focus lens shown in FIG. 7, wherein the vertical direction represents normalization of the field angle, 0 represents on the optical axis, and the vertical direction vertex represents the maximum field radius, as shown in FIG. 9; the horizontal direction is the offset in micrometers (μm) from the reference meridian range of 0.588 μm. The numbers on the graph show the wavelength of the graph in micrometers (mum), and as can be seen from FIG. 5, the vertical axis chromatic aberration can be controlled within (-2μm,2μm), which shows that the chromatic aberration of the fixed focus lens under a wide spectrum is better controlled, and the wide spectrum application requirement can be met.
For a clearer description of the above embodiments, table 4 details specific optical physical parameters of each lens in the fixed focus lenses provided in embodiments one to three of the present invention and other possible optical physical parameters.
TABLE 4 design values of optical physical parameters of fixed focus lenses
/>
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (6)
1. A fixed focus lens is characterized in that,
the lens comprises nine lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
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 form a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, and a sixth lens group that are sequentially arranged from an object plane to an image plane along an optical axis;
each of the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group, and the sixth lens group includes at least one lens, and at least two lens groups are cemented lens groups;
wherein the first lens group includes the first lens; the second lens group is a cemented lens group, and the second lens group includes the cemented second lens, the third lens, and the fourth lens; the third lens group includes the fifth lens; the fourth lens group includes the sixth lens; the fifth lens group includes the seventh lens; the sixth lens group is a cemented lens group, and the sixth lens group includes the eighth lens and the ninth lens cemented; the first lens group has positive optical power, the second lens group has positive optical power, the third lens group has negative optical power, the fourth lens group has positive optical power, the fifth lens group has positive optical power, and the sixth lens group has negative optical power;
alternatively, the first lens group includes the first lens; the second lens group includes the second lens; the third lens group is a cemented lens group, and the third lens group includes the cemented third lens and the fourth lens; the fourth lens group includes the fifth lens; the fifth lens group includes the sixth lens; the sixth lens group is a cemented lens group, and the sixth lens group includes the seventh lens, the eighth lens, and the ninth lens cemented; the first lens group has positive optical power, the second lens group has positive optical power, the third lens group has positive optical power, the fourth lens group has negative optical power, the fifth lens group has positive optical power, and the sixth lens group has positive optical power;
alternatively, the first lens group is a cemented lens group, and the first lens group includes the cemented first lens and the second lens; the second lens group is a cemented lens group, and the second lens group includes the cemented third lens and the fourth lens; the third lens group includes the fifth lens; the fourth lens group includes the sixth lens; the fifth lens group includes the seventh lens; the sixth lens group is a cemented lens group, and the sixth lens group includes the eighth lens and the ninth lens cemented; the first lens group has positive optical power, the second lens group has positive optical power, the third lens group has negative optical power, the fourth lens group has positive optical power, the fifth lens group has negative optical power, and the sixth lens group has positive optical power;
wherein the focal power of the first lens isThe focal power of the second lens is +.>The third lens has optical power of +>The focal power of the fourth lens is +.>The focal power of the fifth lens is +.>The focal power of the sixth lens is +.>The focal power of the seventh lens is +.>The focal power of the eighth lens is +.>The optical power of the ninth lens is +.>The focal power of the fixed focus lens is +.>Wherein:
2. the fixed focus lens of claim 1, wherein,
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface or a concave surface;
the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface or a concave surface;
the object side surface of the third lens is a concave surface or a convex surface, and the image side surface of the third lens is a convex surface or a concave surface;
the object side surface of the fourth lens is a concave surface or a convex surface, and the image side surface of the fourth lens is a concave surface;
the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the object side surface of the sixth lens is a convex surface or a concave surface, and the image side surface of the sixth lens is a concave surface or a convex surface;
the object side surface of the seventh lens is a convex surface or a concave surface, and the image side surface of the seventh lens is a convex surface or a concave surface;
the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface or a concave surface.
3. The fixed focus lens of claim 1, wherein,
the refractive index of the first lens is n1, and the Abbe number of the first lens is v1; the refractive index of the second lens is n2, and the Abbe number of the second lens is v2; the refractive index of the third lens is n3, and the Abbe number of the third lens is v3; the refractive index of the fourth lens is n4, and the Abbe number of the fourth lens is v4; the refractive index of the fifth lens is n5, and the Abbe number of the fifth lens is v5; the refractive index of the sixth lens is n6, and the Abbe number of the sixth lens is v6; the refractive index of the seventh lens is n7, and the Abbe number of the seventh lens is v7; the refractive index of the eighth lens is n8, and the Abbe number of the eighth lens is v8; the refractive index of the ninth lens is n9, and the Abbe number of the ninth lens is v9; wherein:
1.40≤n1≤1.54；56.47≤v1≤95.00；1.43≤n2≤1.97；50.01≤v2≤95.00；
1.53≤n3≤1.88；28.42≤v3≤56.00；1.61≤n4≤1.99；29.00≤v4≤51.84；
1.48≤n5≤1.79；28.82≤v5≤42.94；1.85≤n6≤2.05；22.00≤v6≤33.61；
1.62≤n7≤2.05；19.00≤v7≤31.00；1.65≤n8≤2.05；30.22≤v8≤46.00；
1.59≤n9≤2.05；19.00≤v9≤61.00。
4. the fixed focus lens of claim 1, wherein,
the image plane diameter of the fixed focus lens is IC, and the total length of the fixed focus lens is TTL, wherein IC/TTL is more than or equal to 0.183.
5. The fixed focus lens of claim 1, wherein,
the fixed focus lens further comprises a diaphragm;
the diaphragm is positioned on one side of the object side surface of the first lens.
6. The fixed focus lens of claim 1, wherein,
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 are all glass lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210591901.7A CN114859517B (en) | 2022-05-27 | 2022-05-27 | Fixed focus lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210591901.7A CN114859517B (en) | 2022-05-27 | 2022-05-27 | Fixed focus lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114859517A CN114859517A (en) | 2022-08-05 |
| CN114859517B true CN114859517B (en) | 2023-12-15 |
Family
ID=82641935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210591901.7A Active CN114859517B (en) | 2022-05-27 | 2022-05-27 | Fixed focus lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114859517B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2073048A2 (en) * | 2007-12-20 | 2009-06-24 | Fujinon Corporation | Imaging lens system and imaging apparatus |
| CN107741632A (en) * | 2017-11-14 | 2018-02-27 | 嘉兴中润光学科技有限公司 | Multispectral super large aperture telephotolens |
| CN108415146A (en) * | 2018-04-26 | 2018-08-17 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN108508574A (en) * | 2018-03-13 | 2018-09-07 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN109828355A (en) * | 2018-12-27 | 2019-05-31 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN112684582A (en) * | 2020-12-29 | 2021-04-20 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
-
2022
- 2022-05-27 CN CN202210591901.7A patent/CN114859517B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2073048A2 (en) * | 2007-12-20 | 2009-06-24 | Fujinon Corporation | Imaging lens system and imaging apparatus |
| CN107741632A (en) * | 2017-11-14 | 2018-02-27 | 嘉兴中润光学科技有限公司 | Multispectral super large aperture telephotolens |
| CN108508574A (en) * | 2018-03-13 | 2018-09-07 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN108415146A (en) * | 2018-04-26 | 2018-08-17 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN109828355A (en) * | 2018-12-27 | 2019-05-31 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN112684582A (en) * | 2020-12-29 | 2021-04-20 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114859517A (en) | 2022-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20170090172A (en) | Photographic lens optical system | |
| CN112859299A (en) | Fixed focus lens | |
| CN111610617A (en) | Fixed focus lens | |
| CN112526728A (en) | Fixed focus lens | |
| CN216013794U (en) | Fixed focus lens | |
| CN109683291B (en) | Optical lens and imaging apparatus | |
| CN111983788A (en) | Wide-angle lens | |
| CN114859517B (en) | Fixed focus lens | |
| CN214845994U (en) | Fixed focus lens | |
| CN211478736U (en) | Optical lens group, camera module and terminal | |
| CN210742595U (en) | 0.95mm vehicle-mounted high-definition all-round-looking optical system | |
| CN112305717A (en) | Fixed focus lens | |
| CN113189747A (en) | Fixed focus lens | |
| CN112363306A (en) | Day and night zooming monitoring lens with high resolution and large target surface of 10-30mm and imaging method | |
| CN213122418U (en) | Fixed focus lens | |
| CN217467322U (en) | Fixed focus lens | |
| CN218848433U (en) | Fixed focus lens | |
| CN114647067B (en) | Wide-angle lens | |
| CN220509202U (en) | Fixed focus lens | |
| CN219758572U (en) | Fixed focus lens | |
| CN217587742U (en) | Optical lens | |
| CN213517721U (en) | Fixed focus lens | |
| CN218601562U (en) | Optical imaging system | |
| CN212483964U (en) | Wide-angle lens | |
| CN217587741U (en) | Optical imaging lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |