CN112305718B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
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- CN112305718B CN112305718B CN202011360219.4A CN202011360219A CN112305718B CN 112305718 B CN112305718 B CN 112305718B CN 202011360219 A CN202011360219 A CN 202011360219A CN 112305718 B CN112305718 B CN 112305718B
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- 230000003287 optical effect Effects 0.000 claims abstract description 60
- 239000011521 glass Substances 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 25
- 230000004075 alteration Effects 0.000 description 35
- 238000010586 diagram Methods 0.000 description 16
- 238000005286 illumination Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 8
- 230000000007 visual effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 206010010071 Coma Diseases 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 102220007331 rs111033633 Human genes 0.000 description 1
- 102220008982 rs187686559 Human genes 0.000 description 1
- 102220037846 rs34312177 Human genes 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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses a fixed focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens, the second lens and the fifth lens are all negative focal power lenses, and the third lens, the fourth lens and the sixth lens are all positive focal power lenses; the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the fixed-focus lens is f, so that the fixed-focus lens provided by the invention is: 1.5<|f1/f|<3; 2<|f2/f|<4; 2<|f3/f|<5; 1<|f4/f|<4; 1<|f5/f|<4; 1<|f6/f|<4. The fixed focus lens provided by the present invention meets the requirements of low cost, small size, ultra wide angle and large aperture, and high-definition imaging under low light conditions.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical devices, in particular to a fixed-focus lens.
Background
In the market, with the increasing popularization of security monitoring facilities, the requirements on security monitoring lenses are higher and higher. At present, the large aperture lens is difficult to control in terms of total optical length and cost, and the applicability of the large aperture lens is affected because the total optical length is too long and is difficult to exchange with a common miniature security lens.
Meanwhile, there is an increasing demand for miniaturized lenses and low-cost lenses in the market, so that there is a need to develop a miniaturized, low-cost optical lens with the same optical performance.
Disclosure of Invention
The invention provides a fixed-focus lens, which is used for reducing the cost of the lens, reducing the volume of the lens and meeting the requirements of high-definition imaging under the conditions of low cost, ultra-wide angle, large aperture and low illumination.
The embodiment of the invention provides a fixed focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
The first lens, the second lens and the fifth lens are all negative focal power lenses, and the third lens, the fourth lens and the sixth lens are all positive focal power lenses;
The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the fixed-focus lens is f, so that the following conditions are satisfied:
1.5<|f1/f|<3;2<|f2/f|<4;2<|f3/f|<5;1<|f4/f|<4;1<|f5/f|<4;1<|f6/f|<4.
optionally, the first lens, the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses; the third lens is a glass spherical lens.
Optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, and the refractive index of the sixth lens is n6;
The abbe ratio of the first lens is v1, the abbe ratio of the second lens is v2, the abbe ratio of the third lens is v3, the abbe ratio of the fourth lens is v4, the abbe ratio of the fifth lens is v5, and the abbe ratio of the sixth lens is v6;
Wherein 1.50< n1<1.60, 50< v1<60;
1.50<n2<1.60，50<v2<60；
1.70<n3<2.00，20<v3<50；
1.50<n4<1.60，50<v4<60；
1.55<n5<1.70，20<v5<45；
1.50<n6<1.60，50<v6<60。
optionally, the surface of the lens close to the object plane side is an object side surface, and the surface of the lens close to the image plane side is an image side surface;
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the object side surface of the fifth lens is a concave surface, and the image side surface of the first lens is a convex surface;
the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.
Optionally, the fixed focus lens further comprises a diaphragm;
The diaphragm is disposed in an optical path between the third lens and the fourth lens.
Optionally, the maximum light transmission caliber of the first lens is D1, and the total length of the fixed focus lens is TTL, wherein D1/TTL is less than 0.6;
The surface of the lens close to the image plane side is an image side surface, and the distance from the center of the optical axis of the image side surface of the sixth lens to the image plane is BFL, wherein BFL/TTL is more than 0.15.
Optionally, the focal length of the fixed focus lens is f, and the total length of the fixed focus lens is TTL, wherein TTL/f is less than 8.5.
Optionally, the total length of the fixed focus lens is TTL, which satisfies the following requirements: TTL is less than or equal to 17mm.
Optionally, the F-number of the fixed focus lens is F, where: f is less than or equal to 1.2.
Optionally, the field angle of the fixed focus lens is FOV, wherein: the FOV is more than or equal to 150 degrees.
The fixed focus lens provided by the embodiment of the invention adopts 6 lens combinations, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged from an object plane to an image plane along an optical axis, and the focal power combination modes are negative, positive, negative and positive. By reasonably setting the combination relation of the number of lenses in the fixed focus lens and the focal power of each lens, the requirements of reducing the cost of the lens, reducing the volume of the lens and meeting the high-definition imaging requirements under the conditions of low cost, ultra-wide angle, large aperture and low illumination are met.
Drawings
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention;
Fig. 2 is a light fan diagram of a fixed-focus lens according to a first embodiment of the present invention;
Fig. 3 is an axial chromatic aberration diagram of a fixed-focus lens according to a first embodiment of the present invention;
Fig. 4 is a field curvature distortion diagram of a fixed focus lens according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention;
Fig. 6 is a light fan diagram of a fixed-focus lens according to a second embodiment of the present invention;
Fig. 7 is an axial chromatic aberration diagram of a fixed-focus lens according to a second embodiment of the present invention;
Fig. 8 is a field curvature distortion diagram of a fixed focus lens according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
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 provided in the embodiment of the invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150 and a sixth lens 160, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110, the second lens 130, and the fifth lens 150 are all negative power lenses, and the third lens 130, the fourth lens 140, and the sixth lens 160 are all positive power lenses; the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, the focal length of the fifth lens 150 is f5, the focal length of the sixth lens 160 is f6, and the focal length of the fixed focus lens is f, thereby satisfying the following requirements:
1.5<|f1/f|<3;2<|f2/f|<4;2<|f3/f|<5;1<|f4/f|<4;1<|f5/f|<4;1<|f6/f|<4.
Illustratively, the optical power is equal to the difference between the image plane beam convergence and the image plane beam convergence, which characterizes the ability of the optical system to deflect light. 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).
Specifically, each lens may be fixed in one lens barrel (not shown in fig. 1), and the first lens 110 is provided as a negative power lens, which has the functions of controlling the incident angle of light of the optical system and correcting curvature of field; the second lens 120 is a negative power lens, and has an off-axis aberration correcting effect; the third lens 130 is a positive power lens, and has a function of focusing the light beam at the front end of the third lens 130. The first lens element 110 and the second lens element 120, as the front negative power group, correct the aberration of the rear positive power third lens element 130, and play a key role in preventing the fixed lens from running focus in a high-low temperature environment. Further, the fourth lens 140 is a positive power lens, the fifth lens 150 is a negative power lens, and the sixth lens 160 is a positive power lens, and the fourth lens 140, the fifth lens 150, and the sixth lens 160 have an effect of correcting off-axis aberrations including aberrations such as curvature of field, coma, astigmatism, and the like. The fifth lens 150 is used as the element with the largest negative focal power in the whole lens, and mainly aims to correct chromatic aberration of magnification and axial chromatic aberration so as to ensure the balance of high temperature and low temperature.
Specifically, setting the focal length f1 of the first lens 110 and the focal length f of the fixed focus lens to satisfy 1.5< |f1/f| <3, and setting the focal length f2 of the second lens 120 and the focal length f of the fixed focus lens to satisfy 2< |f2/f| <4, so that the first lenses 110 and 120 jointly correct aberrations of the lenses; the ratio of the focal length of the third lens 130 to the focal length f of the fixed focus lens greatly influences whether the virtual focus is generated under the high and low temperature conditions, so that the focal length f3 of the third lens 130 and the focal length f of the fixed focus lens are set to be 2< |f3/f| <5, and the third lens 130 plays roles of converging light rays, reducing the height of the light rays, correcting spherical aberration and the like; the focal length f4 of the fourth lens 140 and the focal length f of the fixed focus lens are set to 1< |f4/f| <4, the focal length f of the fifth lens 150 and the fixed focus lens are set to 1< |f5/f| <4, and the focal length f6 of the sixth lens 160 and the focal length of the fixed focus lens are set to 1< |f6/f| <4. By reasonably setting the focal length relation between each lens and the fixed focus lens, the spherical aberration and the field curvature of the whole optical system are reduced simultaneously, the on-axis and off-axis visual field image quality is ensured, and the requirement of high-definition imaging of the optical system is ensured.
The fixed focus lens provided by the embodiment of the invention adopts 6 lens combinations, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the focal power combination modes which are sequentially arranged from an object plane to an image plane along an optical axis are negative, positive, negative and positive.
Optionally, with continued reference to fig. 1, the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150 and the sixth lens 160 are plastic aspheric lenses; the third lens 130 is a glass spherical lens.
By way of example, the aspheric lens can be used to correct all higher order aberrations and the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150 and the sixth lens 160 are all plastic aspheric lenses, which not only meets the requirements of high lens pixels, but also reduces the cost of the lens, considering that the cost of the plastic lens is far lower than that of the glass lens. Because the third lens 130 is a main element for converging the light on the axis in the whole lens, a certain thermal effect exists, and the third lens 130 is a glass spherical lens in consideration of the stability of the glass material relative to the plastic material in the high-low temperature environment, so that the cost is considered, the focus is not lost in the high-low temperature environment of-40-80 ℃, and the stability of the fixed focus lens is effectively improved.
Optionally, with continued reference to fig. 1, the fixed focus lens further includes a diaphragm (not shown); a diaphragm is disposed in the optical path between the third lens 130 and the fourth lens 140.
Specifically, by setting the aperture stop in the optical path between the third lens 130 and the fourth lens 140, the propagation direction of the light beam at the front end of the fourth lens 140 is adjusted, and the incident angle of the light beam entering the fourth lens 140 is adjusted, which is beneficial to improving the imaging quality of the fixed focus lens.
It should be noted that the materials of the above plastic aspheric lens can be various plastics known to those skilled in the art, and the materials of the glass spherical lens are various types of glass known to those skilled in the art, and the embodiments of the present invention are not repeated and limited.
In the fixed focus lens provided by the embodiment of the invention, the combination of 5 plastic aspherical lenses and 1 glass spherical lens has the advantages of high image quality and low cost. And because the two materials have the mutual compensation function, the fixed focus lens can still ensure that the resolution power meets the imaging requirement under the environment of-40-80 ℃ and can still be normally used.
As a possible implementation, with continued reference to fig. 1, the surface of the lens close to the image plane is an object side surface, the surface of the lens close to the image plane is an image side surface, the object side surface of the first lens element 110 is a convex surface, and the image side surface of the first lens element 110 is a concave surface; the object side of the second lens element 120 is concave, and the image side of the second lens element 120 is concave; the object side surface of the third lens element 130 is convex, and the image side surface of the third lens element 130 is convex; the fourth lens element 140 has a convex object-side surface, and the fourth lens element 140 has a convex image-side surface; the fifth lens element 150 has a concave object-side surface, and the fifth lens element 150 has a convex image-side surface; the object-side surface of the sixth lens element 160 is convex, and the image-side surface of the sixth lens element 160 is convex.
By way of example, by setting the shape characteristics of the object side surface and the image side surface of the first lens 110 to the sixth lens, the first lens 110 having a convex-concave negative power aspherical lens, the second lens 120 having a biconvex negative power aspherical lens, the third lens 130 having a biconvex positive power spherical lens, the fourth lens 140 having a biconvex positive power aspherical lens, the fifth lens 150 having a convex-concave negative power aspherical lens, and the sixth lens 160 having a biconvex positive power aspherical lens can be obtained, resulting in a specific combination of optical system structures. The first lens 110 can effectively reduce the total optical length and the lens volume by adopting the shape.
Further, by reasonably setting the curvature radius, the center thickness, the refractive index, the Abbe number and the like of the lens, the lens is miniaturized, and the monitoring requirements of high-definition imaging under the conditions of ultra-wide angle large aperture, miniaturization and low illumination are met.
As a possible implementation manner, table 1 shows the optical physical parameters of the curvature radius and thickness of each lens in the fixed focus lens provided in the embodiment of the present invention. Setting the radius of curvature and the thickness of the first lens to the sixth lens to satisfy the following conditions:
table 1 optical physical parameters of fixed focus lens
| Face number | Radius of curvature | Center thickness of |
| 1 | R1＝6～15 | T1＝0.8～4.0 |
| 2 | R2＝1.0～6.0 | T2＝0.05～3.0 |
| 3 | R3＝-5.0～-10.0 | T3＝0.8～4.0 |
| 4 | R4＝2.0～12.0 | T4＝0.05～3.0 |
| 5 | R5＝5.0～20.0 | T5＝0.8～4.0 |
| 6 | R6＝-20.0～-5.0 | T6＝0.05～3.0 |
| 7 | R7＝2.0～5.0 | T7＝0.8～4.0 |
| 8 | R8＝-3.0～-25.0 | T8＝0.05～3.0 |
| 9 | R9＝-1.0～-5.0 | T9＝0.8～4.0 |
| 10 | R10＝-2.0～-50.0 | T10＝0.05～3.0 |
| 11 | R11＝1.0～10.0 | T11＝0.8～4.0 |
| 12 | R12＝-1.0～-10.0 |
In table 1, "R" is a radius of curvature, "T" is a center thickness, and "-" represents a negative direction. Wherein, R1, R3, R5, R7, R9 and R11 sequentially represent the curvature radius of the surface center of the first lens to the surface of the sixth lens, which is close to the image plane, respectively; r2, R4, R6, R8, R10 and R12 sequentially represent the curvature radius of the first lens to the curvature radius of the sixth lens, which are close to the center of the surface of one side of the image plane; t1, T3, T5, T7, T8, T10, T12, T14 in order represent the center thicknesses of the first lens to the sixth lens, respectively; t2, T4, T6, T8, T10 represent the air separation of the first lens to the eighth lens, respectively, in that order.
Specifically, the units of the curvature radius, the center thickness and the air interval are all millimeter (mm), and the curvature radius of the first lens to the sixth lens is set, so that the total length of the light path is shortened, and the overall size of the lens is ensured to be smaller. The center thickness of the first lens to the center thickness of the sixth lens and the air interval between the first lens and the sixth lens are arranged, and the total length of an optical path is short through the optical system formed by the lenses, so that the whole volume of the fixed focus lens is effectively reduced, and the purpose of controlling the whole volume of the optical system is realized.
Optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, and the refractive index of the sixth lens is n6; the abbe ratio of the first lens is v1, the abbe ratio of the second lens is v2, the abbe ratio of the third lens is v3, the abbe ratio of the fourth lens is v4, the abbe ratio of the fifth lens is v5, and the abbe ratio of the sixth lens is v6;
Wherein 1.50< n1<1.60, 50< v1<60;1.50< n2<1.60, 50< v2<60;
1.70<n3<2.00，20<v3<50；1.50<n4<1.60，50<v4<60；
1.55<n5<1.70，20<v5<45；1.50<n6<1.60，50<v6<60。
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.
Specifically, the first lens and the second lens may be set so as to satisfy ：1.5<|f1/f|<3,1.50<n1<1.60,50<v1<60;2<|f2/f|<40,1.50<n2<1.60,50<v2<60, through this parameter range setting, so that the first lens and the second lens have the effect of correcting spherical aberration, curvature of field, astigmatism and coma of the lens.
The third lens is arranged to satisfy: 2< |f3/f| <5,1.70< n3<2.00, 20< v3<50, and through the setting of the parameter range, the balance of aberration can be effectively promoted by combining the ratio of the focal length to the whole fixed focus lens, and the functions of correcting spherical aberration, chromatic aberration of magnification and axial chromatic aberration when the height of the light is reduced by the beam-converging light are achieved.
By setting the fourth lens and the sixth lens to meet ：1<|f4/f|<4,1.50<n4<1.60,50<v4<60;1<|f6/f|<4,1.50<n6<1.60,50<v6<60,, aberrations such as field curvature, astigmatism, spherical aberration and coma can be effectively corrected.
The fifth lens is used as an element with the largest negative focal power in the whole lens, and the fifth lens is arranged to meet the following conditions: 1< |f5/f| <4,1.55< n5<1.70, 20< v5<45, the existence of which corrects chromatic aberration of magnification and axial chromatic aberration, ensures balance of the fixed focus lens in an environment of-40-80 ℃ and plays a role in stabilizing the performance of the lens.
Therefore, the focal length, the refractive index and the Abbe number of each lens in the fixed-focus lens are reasonably set, so that the uniformity of the incident angle of the front and rear groups of lenses is ensured, the sensitivity of the lens is reduced, higher pixel resolution is realized, the field angle of the fixed-focus lens is improved, and the like.
As a possible embodiment, the F-number of the fixed focus lens is F, where: f is less than or equal to 1.2. By reasonably setting lens parameters of the fixed-focus lens, the F of the fixed-focus lens is smaller than or equal to 1.2, and the characteristics of small volume, large field of view and no focus running at high and low temperatures are met.
Optionally, the focal length of the fixed focus lens is f, the total length of the fixed focus lens is TTL, and TTL/f is less than 8.5. The focal length of the fixed focus lens and the total length of the fixed focus lens can meet TTL/f < 8.5 through reasonable lens collocation and parameter optimization, and the volume of the lens is effectively controlled.
Optionally, the total length of the fixed focus lens is TTL, and the total length is as follows: TTL is less than or equal to 17mm. Specifically, the total length of the lens can be controlled within 17mm, the volume can be effectively controlled, and the miniaturization of the lens is realized.
Optionally, the field angle of the fixed focus lens is FOV, wherein: the FOV is more than or equal to 150 degrees. Specifically, the aim of monitoring the ultra-large visual field range with the visual field angle which is more than or equal to 150 degrees and meets the FOV can be achieved through parameter optimization of the fixed-focus lens.
Optionally, the maximum light transmission caliber of the first lens is D1, and the total length of the fixed focus lens is TTL, wherein D1/TTL is less than 0.6; the surface of the lens close to the image plane side is an image side surface, and the distance from the center of the optical axis of the image side surface of the eighth lens to the image plane is BFL, wherein BFL/TTL is more than 0.15.
Further, in order to ensure that the lens cannot interfere with the base and the shell during installation, the maximum light transmission caliber of the first lens is set to be D1, the total length of the fixed focus lens is set to be TTL, and the parameters D1/TTL are satisfied to be less than 0.6; meanwhile, the surface of the lens close to one side of the image plane is defined as an image side surface, the distance from the center of the optical axis of the image side surface of the eighth lens to the image plane is BFL, the BFL/TTL is more than 0.15, the compact structure of the whole fixed focus lens can be ensured, the fixed focus lens is high in integration level, convenient to install and practical, the miniaturization requirement is achieved, and the fixed focus lens is suitable for monitoring requirements under low-illumination conditions.
The fixed focus lens provided by the embodiment of the invention adopts a method of mixing 1 glass spherical lens and 5 plastic aspherical lenses, and ensures the performance of an optical system and simultaneously ensures the low cost and easy processing of the lens by reasonably distributing the focal power, the surface number, the Abbe number, the center thickness and the like of each lens. On the premise of ensuring that the F-number of the lens is less than or equal to 1.2, the field angle is more than 150 degrees, and the ratio of the total length TTL of the optical system to the focal length F of the optical system is as follows: TTL/f is less than 8.5, total length TTL of the optical system is less than 17mm, and the optical system can be used in an environment of-40-80 ℃ to ensure that resolution meets imaging requirements. The fixed focus lens ensures the openness of the visual field, meets the ultra-large light quantity, is miniaturized, and is suitable for the monitoring requirement under the low-illumination condition.
Specific examples of the fixed focus lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
With continued reference to fig. 1, the fixed focus lens provided in the 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, and a sixth lens 160, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110, the second lens 130, and the fifth lens 150 are all negative power lenses, and the third lens 130, the fourth lens 140, and the sixth lens 160 are all positive power lenses; the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, the focal length of the fifth lens 150 is f5, the focal length of the sixth lens 160 is f6, and the focal length of the fixed focus lens is f, thereby satisfying the following requirements:
1.5<|f1/f|<3;2<|f2/f|<4;2<|f3/f|<5;1<|f4/f|<4;1<|f5/f|<4;1<|f6/f|<4.
Table 2 shows the surface type, radius of curvature, thickness, and optical physical parameters of the materials of each lens in the fixed focus lens provided in the first embodiment.
Table 2 optical physical parameters of fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Material (nd) |
| S1 | Aspherical surface | 8.1 | 0.9 | 1.54/56.0 |
| S2 | Aspherical surface | 1.9 | 2.7 | |
| S3 | Aspherical surface | -5.8 | 0.8 | 1.54/55.7 |
| S4 | Aspherical surface | 11.5 | 0.1 | |
| S5 | Spherical surface | 20.3 | 3.2 | 1.95/17.9 |
| Diaphragm surface S6 | Spherical surface | -12.2 | 0.1 | |
| S7 | Aspherical surface | 3.9 | 2.0 | 1.54/55.7 |
| S8 | Aspherical surface | -4.4 | 0.2 | |
| S9 | Aspherical surface | -1.5 | 0.8 | 1.67/19.3 |
| S10 | Aspherical surface | -6.4 | 0.1 | |
| S11 | Aspherical surface | 2.3 | 2.6 | 1.54/56.0 |
| S12 | Non-planar surface | -3.8 | 1.3 | |
| S13 | Spherical surface | Infinite number of cases | 0.7 | 1.52/64.2 |
| S14 | Spherical surface | Infinite number of cases | 1.6 |
In table 2, the surface numbers are numbered according to the surface order of the respective lenses, for example, the surfaces with the surface numbers S1 and S2 are the object side surface and the image side surface of the first lens element 110, the surfaces with the surface numbers S3 and S4 are the object side surface and the image side surface of the second lens element 120, 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 image plane, and negative values represent the curvature of the surface toward the object plane; thickness represents the center axial distance from the current surface to the next surface, and the radius of curvature and thickness are in millimeters (mm).
Optionally, with continued reference to fig. 1, the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, and the sixth lens 160 are plastic aspheric lenses; the third lens 130 is a glass spherical lens. The cost is considered, the coke is not run when the high temperature and the low temperature are changed in the environment of-40 ℃ to 80 ℃, and the stability of the fixed-focus lens is effectively improved.
The fixed focus lens provided by the first embodiment of the invention further comprises a diaphragm (not shown in the figure); a diaphragm is disposed in the optical path between the third lens 130 and the fourth lens 140. The propagation direction of the light beam can be adjusted by additionally arranging the diaphragm, which is beneficial to improving the imaging quality. A diaphragm may be located in the optical path between the third lens 130 and the fourth lens 140, but the specific position setting of the diaphragm is not limited by the embodiment of the present invention.
The aspherical lens shape equation Z of the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, and the sixth lens 160 satisfies:
Wherein Z is the height vector of the aspheric surface at the position with the height y along the optical axis direction, and the distance vector is higher from the vertex of the aspheric surface; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D, E, F is the higher order aspheric coefficient, wherein Z, R and y are both in mm.
Table 3 details the aspherical coefficients of the lenses in this example one, by way of example, in one possible implementation.
Table 3 aspherical coefficients in fixed focus lenses
Where-7.25E-04 denotes a coefficient a of plane number 1 of-7.25 x 10 -4, and so on.
The fixed focus lens of the first embodiment achieves the following technical indexes:
Focal length: f=1.9 mm;
f-number: f=1.1;
Angle of view: 2w is more than or equal to 150 degrees;
the applicable spectral line range: 436-656 nm;
resolution ratio: can be adapted to a 200 ten thousand pixel high resolution CCD or CMOS camera.
Further, fig. 2 is a light fan diagram of a fixed focus lens according to a first embodiment of the present invention. As shown in fig. 2, the imaging ranges of the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) under different angles of view of the fixed focus lens are all within 50 μm, and the curves are very concentrated, which shows that the fixed focus lens has smaller aberration in different field areas, the imaging is clear, and the aberration of the optical system is better corrected.
Fig. 3 is an axial chromatic aberration diagram of a fixed focus lens provided by an embodiment of the present invention. As shown in FIG. 3, the spherical aberration of the fixed focus lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) is within 0.05mm, and different wavelength curves are relatively concentrated, which indicates that the axial aberration of the fixed focus lens is very small, so that it is known that the fixed focus lens provided by the embodiment of the invention can better correct the aberration.
Fig. 4 is a field curvature distortion diagram of a fixed focus lens according to an embodiment of the present invention. As shown in fig. 4, there are two coordinate systems, wherein, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; wherein T represents meridian and S represents arc loss; as can be seen from the left coordinate system of fig. 4, the fixed focus lens provided in this embodiment is effectively controlled in field curvature for light with a wavelength of 0.436 μm to 0.656 μm, that is, the difference between the image quality of the center and the image quality of the periphery is small during imaging. In the right coordinate system, the horizontal coordinate represents the magnitude of distortion in units of; the vertical coordinates represent the normalized image height without units; as can be seen from the right coordinate system of fig. 4, the distortion of the fisheye lens provided in the embodiment is well corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
As shown in fig. 2, fig. 3 and fig. 4, the axial aberration of the fixed focus lens provided by the embodiment of the invention is small; the field curvature is smaller, the distortion is smaller, namely, the difference between the image quality of the center and the image quality of the periphery is smaller during imaging; the imaging quality is higher, and the imaging performance requirements of ultra-large light quantity, high and low temperature and low illumination are met.
In summary, in the fixed focus lens provided in the first embodiment of the present invention, a method of mixing 1 glass spherical lens and 5 plastic aspherical lenses is adopted, and by reasonably distributing focal power, surface, abbe number, center thickness, etc. of each lens, the performance of the optical system is ensured, and meanwhile, the cost of the lens is ensured to be low and the lens is easy to process. On the premise of ensuring that the aperture F of the lens is less than or equal to 1.2, the angle of view is greater than 150 degrees, the total length TTL of an optical system is less than 17mm, the applicable spectral line range is 436-656 nm, the lens can be matched with a 200-ten-thousand-pixel high-resolution CCD or CMOS camera, and the lens can be used in an environment of-40-80 ℃ to ensure that the resolution meets the imaging requirement under low illumination. The fixed focus lens ensures the openness of the visual field, meets the ultra-large light quantity, is miniaturized, and is suitable for the monitoring requirement under the low-illumination condition.
Example two
Fig. 5 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention, as shown in fig. 5, the fixed-focus lens according to the embodiment of the present invention includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 210, the second lens 230, and the fifth lens 250 are all negative power lenses, and the third lens 230, the fourth lens 240, and the sixth lens 260 are all positive power lenses; the focal length of the first lens 210 is f1, the focal length of the second lens 220 is f2, the focal length of the third lens 230 is f3, the focal length of the fourth lens 240 is f4, the focal length of the fifth lens 250 is f5, the focal length of the sixth lens 260 is f6, and the focal length of the fixed focus lens is f, thereby satisfying the following requirements:
1.5<|f1/f|<3;2<|f2/f|<4;2<|f3/f|<5;1<|f4/f|<4;1<|f5/f|<4;1<|f6/f|<4.
Table 4 shows the optical physical parameters of the surface type, radius of curvature, thickness, and material of each lens in the fixed focus lens provided in the second embodiment.
Table 4 optical physical parameters of fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Material (nd) |
| S1 | Aspherical surface | 35.1 | 0.8 | 1.54/55.7 |
| S2 | Aspherical surface | 2.4 | 2.3 | |
| S3 | Aspherical surface | -6.1 | 0.8 | 1.54/55.7 |
| S4 | Aspherical surface | 5.0 | 0.1 | |
| S5 | Aspherical surface | 6.9 | 4.1 | 1.90/31.4 |
| S6 | Aspherical surface | -8.5 | 0.1 | |
| Diaphragm S7 | Spherical surface | 4.3 | 1.9 | 1.54/55.7 |
| S8 | Spherical surface | -4.2 | 0.2 | |
| S9 | Aspherical surface | -1.7 | 0.8 | 1.66/20.3 |
| S10 | Aspherical surface | -18.8 | 0.1 | |
| S11 | Aspherical surface | 2.7 | 2.1 | 1.54/55.7 |
| S12 | Non-planar surface | -4.0 | 1.3 | |
| S13 | Spherical surface | Infinite number of cases | 0.7 | 1.52/64.2 |
| S14 | Spherical surface | Infinite number of cases | 1.8 |
In table 4, the surface numbers are numbered according to the surface order of the respective lenses, for example, the surfaces with the surface numbers S1 and S2 are the object side surface and the image side surface of the first lens element 210, the surfaces with the surface numbers S3 and S4 are the object side surface and the image side surface of the second lens element 220, 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 image plane, and negative values represent the curvature of the surface toward the object plane; thickness represents the center axial distance from the current surface to the next surface, and the radius of curvature and thickness are in millimeters (mm).
With continued reference to fig. 1 based on the above implementation, the first lens 210, the second lens 220, the fourth lens 240, the fifth lens 250, and the sixth lens 260 are optionally plastic aspheric lenses; the third lens 230 is a glass spherical lens. The cost is considered, the coke is not run when the high temperature and the low temperature are changed in the environment of-40 ℃ to 80 ℃, and the stability of the fixed-focus lens is effectively improved.
The fixed focus lens provided by the first embodiment of the invention further comprises a diaphragm (not shown in the figure); a diaphragm is disposed in the optical path between the third lens 230 and the fourth lens 240. The propagation direction of the light beam can be adjusted by additionally arranging the diaphragm, which is beneficial to improving the imaging quality. A stop may be located in the optical path between the third lens 230 and the fourth lens 240, but the specific position setting of the stop is not limited by the embodiment of the present invention.
The aspherical lens surface shape equation Z of the first lens 210, the second lens 220, the fourth lens 240, the fifth lens 250, and the sixth lens 260 satisfies:
Wherein Z is the height vector of the aspheric surface at the position with the height y along the optical axis direction, and the distance vector is higher from the vertex of the aspheric surface; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D, E, F is the higher order aspheric coefficient, wherein Z, R and y are both in mm.
Table 5 details the aspherical coefficients of the lenses in this example two in one possible implementation, by way of example.
Table 5 aspherical coefficients in fixed focus lenses
Wherein 5.61E-04 indicates a coefficient a of face number 1 of 5.61 x 10 -4, and so on.
The fixed focus lens of the second embodiment achieves the following technical indexes:
Focal length: f=2.1 mm;
f-number: f=1.1;
Angle of view: 2w is more than or equal to 150 degrees;
the applicable spectral line range: 436-656 nm;
resolution ratio: can be adapted to a 200 ten thousand pixel high resolution CCD or CMOS camera.
Further, fig. 6 is a light ray fan diagram of a fixed-focus lens according to a second embodiment of the present invention, as shown in fig. 6, the imaging ranges of light rays with different wavelengths (0.436 μm, 0.486 μm, 0.548 μm, 0.588 μm and 0.656 μm) under different angles of view of the fixed-focus lens are all within 50 μm and the curves are very concentrated, so that the aberration of different field areas is ensured to be smaller, that is, the fixed-focus lens is illustrated to correct the aberration of the optical system better.
Fig. 7 is an axial chromatic aberration diagram of a fixed-focus lens according to a second embodiment of the present invention. As shown in FIG. 7, the spherical aberration of the fixed focus lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) is within 0.05mm, and different wavelength curves are relatively concentrated, which indicates that the axial aberration of the fixed focus lens is very small, so that it is known that the fixed focus lens provided by the embodiment of the invention can better correct the aberration.
Fig. 8 is a field curvature distortion diagram of a fixed focus lens according to a second embodiment of the present invention, as shown in fig. 8, having two coordinate systems, wherein in a left coordinate system, a horizontal coordinate represents a field curvature, and a unit is mm; the vertical coordinates represent the normalized image height without units; wherein T represents meridian and S represents arc loss; as can be seen from the left coordinate system of fig. 8, the fixed focus lens provided in this embodiment is effectively controlled in field curvature for light with a wavelength of 0.436 μm to 0.656 μm, that is, the difference between the image quality at the center and the image quality at the periphery is small during imaging. In the right coordinate system, the horizontal coordinate represents the magnitude of distortion in units of; the vertical coordinates represent the normalized image height without units; as can be seen from the right coordinate system of FIG. 8, the distortion of the fisheye lens provided by the embodiment is well corrected, the imaging distortion is smaller, and the requirement of low distortion is satisfied
As shown in fig. 6, fig. 7 and fig. 8, the axial aberration of the fixed focus lens provided by the embodiment of the invention is small; the field curvature is smaller, the distortion is smaller, namely, the difference between the image quality of the center and the image quality of the periphery is smaller during imaging; the imaging quality is higher, and the imaging performance requirements of ultra-large pass, high and low temperature and low illumination are met.
In summary, in the fixed focus lens provided in the second embodiment of the present invention, a method of mixing 1 glass spherical lens and 5 plastic aspherical lenses is adopted, and by reasonably distributing focal power, surface, abbe number, center thickness, etc. of each lens, the performance of the optical system is ensured, and meanwhile, the cost of the lens is ensured to be low and the lens is easy to process. On the premise of ensuring that the aperture number F of the lens is less than or equal to 1.2, the angle of view is larger than 150 degrees, the ratio of the total length TTL of the optical system to the focal length F of the optical system is smaller than 8.5, the total length TTL of the optical system is smaller than 17mm, the applicable spectral line range is 436-656 nm, the lens can be matched with a 200-ten-thousand-pixel high-resolution CCD or CMOS camera, and the lens can be used in an environment of-40-80 ℃ to ensure that the resolution meets the imaging requirement under low illumination. The fixed focus lens ensures the openness of the visual field, meets the ultra-large light quantity, is miniaturized, and is suitable for the monitoring requirement under the low-illumination condition.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The fixed focus lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis, wherein each lens is fixed on a lens barrel;
The first lens, the second lens and the fifth lens are all negative focal power lenses, and the third lens, the fourth lens and the sixth lens are all positive focal power lenses;
The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the fixed-focus lens is f, so that the following conditions are satisfied:
1.5<|f1/f|<3;2<|f2/f|<4;2<|f3/f|<5;1<|f4/f|<4;1<|f5/f|<4;1<|f6/f|<4;
the F-number of the fixed focus lens is F, wherein: f is less than or equal to 1.2.
2. The fixed focus lens of claim 1, wherein the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspheric lenses; the third lens is a glass spherical lens.
3. The fixed focus lens of claim 1, wherein the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, and the refractive index of the sixth lens is n6;
The abbe ratio of the first lens is v1, the abbe ratio of the second lens is v2, the abbe ratio of the third lens is v3, the abbe ratio of the fourth lens is v4, the abbe ratio of the fifth lens is v5, and the abbe ratio of the sixth lens is v6;
Wherein 1.50< n1<1.60, 50< v1<60;
1.50<n2<1.60，50<v2<60；
1.70<n3<2.00，20<v3<50；
1.50<n4<1.60，50<v4<60；
1.55<n5<1.70，20<v5<45；
1.50<n6<1.60，50<v6<60。
4. The fixed focus lens of claim 1, wherein a surface of the lens adjacent to the object plane is an object side surface, and a surface of the lens adjacent to the image plane is an image side surface;
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
The object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.
5. The fixed focus lens of claim 1, further comprising a stop;
The diaphragm is disposed in an optical path between the third lens and the fourth lens.
6. The fixed focus lens of claim 1, wherein the maximum light transmission aperture of the first lens is D1, and the total length of the fixed focus lens is TTL, wherein D1/TTL < 0.6;
The surface of the lens close to the image plane side is an image side surface, and the distance from the center of the optical axis of the image side surface of the sixth lens to the image plane is BFL, wherein BFL/TTL is more than 0.15.
7. The fixed focus lens of claim 1, wherein the focal length of the fixed focus lens is f, and the total length of the fixed focus lens is TTL, TTL/f < 8.5.
8. The fixed focus lens of claim 7, wherein the fixed focus lens has a total length TTL that satisfies: TTL is less than or equal to 17mm.
9. The fixed focus lens of claim 1, wherein the field angle of the fixed focus lens is FOV, wherein: the FOV is more than or equal to 150 degrees.
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| CN105204140A (en) * | 2015-10-28 | 2015-12-30 | 东莞市宇瞳光学科技有限公司 | High-definition super wide angle prime lens |
| CN108983401A (en) * | 2018-10-10 | 2018-12-11 | 浙江舜宇光学有限公司 | Optical lens group |
| CN213633972U (en) * | 2020-11-27 | 2021-07-06 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
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| CN105204140A (en) * | 2015-10-28 | 2015-12-30 | 东莞市宇瞳光学科技有限公司 | High-definition super wide angle prime lens |
| CN108983401A (en) * | 2018-10-10 | 2018-12-11 | 浙江舜宇光学有限公司 | Optical lens group |
| CN213633972U (en) * | 2020-11-27 | 2021-07-06 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
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