CN108646390B - Near infrared large aperture lens - Google Patents
Near infrared large aperture lens Download PDFInfo
- Publication number
- CN108646390B CN108646390B CN201810864575.6A CN201810864575A CN108646390B CN 108646390 B CN108646390 B CN 108646390B CN 201810864575 A CN201810864575 A CN 201810864575A CN 108646390 B CN108646390 B CN 108646390B
- Authority
- CN
- China
- Prior art keywords
- lens
- relation
- focal length
- sag1
- large aperture
- 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 85
- 239000000463 material Substances 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 239000005304 optical glass Substances 0.000 claims description 5
- 210000001747 pupil Anatomy 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 17
- 230000004075 alteration Effects 0.000 description 16
- 238000012545 processing Methods 0.000 description 9
- 230000035945 sensitivity Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 210000000887 face Anatomy 0.000 description 5
- 238000005286 illumination Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007704 transition Effects 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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
-
- 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
Abstract
The invention relates to a near infrared large aperture lens, comprising: a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from an object side to an image side along an optical axis; the first lens, the fourth lens and the fifth lens are negative focal power lenses; the second lens, the third lens, the sixth lens and the seventh lens are positive focal power lenses; the first lens is a convex-concave lens along the direction from the object side to the image side; the fifth lens is a concave-convex lens; the sixth lens is a biconvex lens; the seventh lens is a convex-concave lens. The near infrared large aperture lens has the characteristics of large field angle, low distortion and small volume.
Description
Technical Field
The invention relates to the technical field of optical detection system design, in particular to a near infrared large aperture lens.
Background
The infrared detection lens is widely applied to military equipment, security monitoring, three-dimensional space measurement and the like. With the expansion of the application to the field of high-precision tips, new and higher requirements are put on an infrared detection lens. The most important performance index of the infrared detection lens is the requirement on the received light quantity, and the infrared light reflected by the object can still be collected to the greatest extent in an environment with weak light so as to fully acquire the information of the target object; and the higher brightness of the image plane edge is ensured, so that the detection capability of the edge view field is improved. Meanwhile, the infrared detection lens also needs to meet the requirements of large angle, low distortion and miniaturization so as to improve the measurement accuracy of the three-dimensional space.
The current common large aperture near infrared lens is generally composed of 6-10 lenses, and in an application environment with extremely weak light, the requirement of large light flux is difficult to meet, enough reflected infrared light is not collected, and the brightness of the edge of an imaging surface is darker, so that the measurement precision of a three-dimensional space is reduced.
Disclosure of Invention
An object of the present invention is to solve the above problems and provide an ultra-large aperture near-infrared large aperture lens with a large angle of view, low distortion and small volume.
In order to achieve the above object, the present invention provides a near infrared large aperture lens, comprising: a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from an object side to an image side along an optical axis;
the first lens, the fourth lens and the fifth lens are negative focal power lenses;
the second lens, the third lens, the sixth lens and the seventh lens are positive focal power lenses;
the first lens is a convex-concave lens along the direction from the object side to the image side;
the fifth lens is a concave-convex lens;
the sixth lens is a biconvex lens;
the seventh lens is a convex-concave lens.
According to one aspect of the invention, the effective focal length f of the lens and the entrance pupil diameter D of the lens satisfy the relation: f/D is less than 1.1.
According to one aspect of the invention, the effective aperture value F of the off-axis field of view of the lens off An effective aperture value F of an on-axis field of view of the lens on The relation is satisfied: f (F) off /F on ＜1.35。
According to one aspect of the present invention, the half image height IH of the lens and the field angle FOV of the lens satisfy the relation: 3.75 < IH/tan (FOV/2) < 4.0.
According to one aspect of the invention, along the direction from the object side to the image side, the surfaces of the first lens to the seventh lens facing the object side are a first optical surface, the surface facing the image side is a second optical surface, and the second optical surface of the first lens has an optical effective aperture D 1-2 Radius of curvature R of the second optical surface of the first lens 1-2 The relation is satisfied: d is less than 1.35 1-2 /R 1-2 ＜1.9。
According to one aspect of the invention, the radius of curvature R of the first optical surface of the fifth lens 5-1 The method meets the following conditions: -15.00 < R 5-1 ＜-7.50；
Radius of curvature R of the second optical surface of the fifth lens 5-2 The method meets the following conditions: -31.00 < R 5-2 ＜-9.00；
Radius of curvature R of the first optical surface of the fifth lens 5-1 Radius of curvature R of the second optical surface of the fifth lens 5-2 The relation is satisfied: r is more than 1.10 5-2 /R 5-1 ＜2.1。
According to one aspect of the present invention, the effective focal length f1 of the first lens and the effective focal length f of the lens satisfy the relation: -3.00 < f1/f < -1.90;
the effective focal length f2 of the second lens and the effective focal length f of the lens satisfy the relation: 4.00 < f2/f < 7.50.
According to one aspect of the present invention, the effective focal length f3 of the third lens and the effective focal length f of the lens satisfy the relation: 2.00 < f3/f < 4.00;
the effective focal length f4 of the fourth lens and the effective focal length f of the lens satisfy the relation: -30.00 < f4/f < -12.00.
According to one aspect of the present invention, the effective focal length f5 of the fifth lens and the effective focal length f of the lens satisfy the relation: -24.00 < f5/f < -6.0;
the effective focal length f6 of the sixth lens and the effective focal length f of the lens satisfy the relation: f6/f is less than 1.60 and less than 2.30;
the effective focal length f7 of the seventh lens and the effective focal length f of the lens satisfy the relation: 4.00 < f7/f < 5.50.
According to one aspect of the present invention, the refractive index of the first lens material is nd1, the abbe number is vd1, and the refractive indices satisfy the following conditions: nd1 is more than 1.80 and less than 2.10, and vd1 is more than 17 and less than 35;
the refractive index of the fourth lens material is nd4, the abbe number is vd4, and the refractive index and the abbe number respectively satisfy: 1.60 < nd4 < 1.9, 25< vd4 < 64.
According to one aspect of the invention, the seventh lens is a glass aspheric lens, and the refractive index of the seventh lens material is nd7, satisfying that nd7 > 1.75.
According to one aspect of the present invention, the sagittal height of the seventh lens satisfies the following relationship:
1.00＜SAG1_1.0h/SAG1_0.8h＜1.50
1.60＜SAG1_0.8h/SAG1_0.6h＜1.80
2.0＜SAG1_0.6h/SAG1_0.4h＜2.50
3.00＜SAG1_0.4h/SAG1_0.2h＜4.00
wherein, SAG1_1.0h is the sagittal height of the maximum optical effective diameter on the first optical surface of the seventh lens, SAG1_0.8h is the sagittal height of the 0.8 times maximum optical effective diameter on the first optical surface of the seventh lens, SAG1_0.6h is the sagittal height of the 0.6 times maximum optical effective diameter on the first optical surface of the seventh lens, SAG1_0.4h is the sagittal height of the 0.4 times maximum optical effective diameter on the first optical surface of the seventh lens, SAG1_0.2h is the sagittal height of the 0.2 times maximum optical effective diameter on the first optical surface of the seventh lens.
According to one aspect of the invention, the radius of curvature R of the first optical surface of the seventh lens 7-1 And the center thickness CT of the seventh lens satisfies the relation: r is more than 2.50 and less than 7-1 /CT＜3.10；
Radius of curvature R of the second optical surface of the seventh lens 7-2 And the center thickness CT of the seventh lens satisfies the relation: r is more than 3.10 and less than 7-2 /CT＜5.20。
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are each made of an optical glass material.
According to the scheme, the lens with specific focal power is arranged at the specific position of the lens, so that reasonable collocation of the positive focal power lens and the negative focal power lens is realized, light rays entering at a large angle can pass through each lens gradually at a smaller angle, system aberration is corrected, and tolerance sensitivity of the system is reduced.
The diaphragm is arranged between the third lens and the fourth lens, seven lenses of the system are reasonably separated, and a front group is formed by the first lens, the second lens and the third lens before the diaphragm; the rear group is composed of a fourth lens, a fifth lens, a sixth lens and a seventh lens behind the diaphragm. The front group mainly reduces the angle of the incident light, so that the light can pass through the diaphragm at a smaller angle, and the rear group is beneficial to controlling distortion and correcting aberration.
According to an aspect of the present invention, the first lens is a convex-concave lens, the fifth lens is a concave-convex lens, the sixth lens is a biconvex lens, and the seventh lens is a convex-concave lens. By the arrangement, the main light can be incident on the surface of the system at a smaller angle, so that tolerance sensitivity of the system is effectively reduced, and the system is more beneficial to processing and production. And when the sixth lens is biconvex, the transition of light from the fifth lens to the seventh lens is gentle, the aberration is corrected, the distortion is controlled, and the relative illumination is improved.
According to one aspect of the present invention, the effective focal length f of the lens and the entrance pupil diameter D of the lens satisfy the relation: f/D is less than 1.1. By the arrangement, the large aperture of the lens ensures that near infrared rays reflected by an object can be collected to the greatest extent in an environment with weak rays, so that the image surface has enough brightness, information of a detected object can be fully acquired, and the accuracy of three-dimensional space detection is improved.
According to one aspect of the invention, the effective aperture value F of the off-axis field of view of the lens off Effective aperture value F of on-axis field of view of lens on The relation is satisfied: f (F) off /F on < 1.35. The relation is satisfied, and the near infrared rays reflected by the object can be collected to the greatest extent, meanwhile, enough brightness at the edge of the image surface is ensured, so that the whole brightness of the picture is uniform and excessive from the center to the edge, and the detection precision of the lens to the three-dimensional space is improved.
According to an aspect of the present invention, the half image height IH of the lens and the field angle FOV of the lens satisfy the relation: 3.75 < IH/tan (FOV/2) < 4.0. By the arrangement, the distortion of the optical system is effectively controlled on the premise that the system meets a certain view field angle and image height, and detection errors of the three-dimensional space caused by distortion are reduced to the greatest extent.
According to one aspect of the present invention, the first lens is curved toward the aperture to form a meniscus-like shape, reducing the incidence height of the chief ray, facilitating correction of aberrations of the off-axis field of view. Meanwhile, the second optical surface of the first lens is not more than a hemisphere, so that the grinding processing of the lens is facilitated, and the yield is improved.
According to the scheme of the invention, the fifth lens keeps negative focal power and bends towards the diaphragm in a meniscus shape, so that light beams of all visual fields outside the axis can be transmitted backwards to the image surface in a wider caliber, the higher relative illumination of the edge of the image surface relative to the center is ensured, and more detail information in a three-dimensional space can be fully saved.
According to the scheme of the invention, the optical power of the first lens and the second lens is reasonably distributed, the incidence angle of the off-axis vision field light is effectively reduced, the incidence angle of the off-axis vision field chief ray on each optical surface is reduced, and the aberration of the off-axis vision field is favorably corrected.
According to one scheme of the invention, the focal power of the third lens and the fourth lens is reasonably distributed, the aberration of the off-axis view field can be corrected, meanwhile, the light beams of all the off-axis view fields can be filled with diaphragms in the process of passing through the system, and the higher relative illumination of the image surface is ensured.
According to one scheme of the invention, the focal power of the fifth lens, the sixth lens and the seventh lens are reasonably distributed, so that the light rays of the off-axis view field can smoothly reach the image surface at a smaller angle on the premise of meeting the effective focal length of the system, and the light rays of each view field can keep the light beams as wide as possible in the transmission process, so that the edge of the image surface has higher relative illumination.
According to an aspect of the present invention, the refractive index of the first lens material is nd1, the abbe number is vd1, and the refractive indices satisfy: nd1 is more than 1.80 and less than 2.10, and vd1 is more than 17 and less than 35; the refractive index of the fourth lens material is nd4, the abbe number is vd4, and the refractive indices satisfy the following conditions: 1.60 < nd4 < 1.90, 25< vd4 < 64. The first lens and the fourth lens are matched according to the relation range, so that the lens can have higher transmittance in a wider near infrared band, and near infrared rays reflected by an object are collected to the greatest extent.
According to one aspect of the invention, the seventh lens is a glass aspherical lens, and the refractive index of the seventh lens material is nd7, satisfying that nd7 > 1.75. The seventh lens is a glass aspheric lens with high refractive index, can correct aberration control distortion, can reduce the use quantity of the glass spherical lens while guaranteeing the optical performance, and realizes the advantages of light weight and total length of the lens.
According to one scheme of the invention, through the sagittal arrangement of the seventh lens, the condition that curvature inversion does not occur on the glass aspheric surface ensures that the glass aspheric surface can be compression molded, and meanwhile, the stability of the surface shape of the aspheric surface after compression molding is ensured, and the tolerance sensitivity is reduced.
According to one scheme of the invention, the seventh lens is bent towards the image surface with positive focal power, so that light beams of all visual fields outside the axis can be well focused on the image surface, namely, the aberration is corrected, and the requirement of image height is met.
According to one scheme of the invention, all lenses are made of optical glass materials, so that the optical quality of the lenses is improved, and the performance stability of the lenses when working at different temperatures is ensured; and the full glass structure has better mechanical strength, and can be suitable for complex environments.
The near infrared large aperture lens has the characteristics of large aperture, large field angle, low distortion and small volume, has great advantages compared with the prior lens, and is particularly suitable for the field of low-light infrared three-dimensional space measurement.
Drawings
Fig. 1 schematically shows a block diagram of a near-infrared large aperture lens according to a first embodiment of the present invention;
fig. 2 schematically shows a relative illuminance map of a near-infrared large aperture lens of the first embodiment;
fig. 3 schematically shows a distortion graph of a near-infrared large aperture lens of the first embodiment;
fig. 4 schematically shows a block diagram of a near infrared large aperture lens according to a second embodiment of the present invention;
fig. 5 schematically shows a relative illuminance map of a near-infrared large aperture lens of a second embodiment;
fig. 6 schematically shows a distortion graph of a near-infrared large aperture lens of the second embodiment;
fig. 7 schematically shows a block diagram of a near infrared large aperture lens according to a third embodiment of the present invention;
fig. 8 schematically shows a relative illuminance map of a near-infrared large aperture lens of a third embodiment;
fig. 9 schematically shows a distortion graph of a near-infrared large aperture lens of the third embodiment;
fig. 10 schematically shows a structure of a near infrared large aperture lens according to a fourth embodiment of the present invention;
fig. 11 schematically shows a relative illuminance map of a near-infrared large aperture lens of a fourth embodiment;
fig. 12 schematically shows a distortion graph of a near-infrared large aperture lens of the fourth embodiment;
fig. 13 schematically shows a structure of a near infrared large aperture lens according to a fifth embodiment of the present invention;
fig. 14 schematically shows a relative illuminance map of a near-infrared large aperture lens of a fifth embodiment;
fig. 15 schematically shows a distortion graph of a near-infrared large aperture lens of the fifth embodiment.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
The near-infrared large aperture lens according to the present invention is constituted by a first lens 1, a second lens 2, a third lens 3, a stop S, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged in order from the object side to the image side along the optical axis. In the present invention, the first lens 1, the fourth lens 4, and the fifth lens 5 are negative power lenses, and the second lens 2, the third lens 3, the sixth lens 6, and the seventh lens 7 are positive power lenses.
According to the arrangement of the invention, the lens with specific focal power is arranged at the specific position of the lens, so that reasonable collocation of the positive focal power lens and the negative focal power lens is realized, and light rays entering at a large angle can pass through each lens gradually at a smaller angle, thereby being beneficial to correcting system aberration and reducing tolerance sensitivity of the system.
The diaphragm is arranged between the third lens and the fourth lens, seven lenses of the system are reasonably separated, and a front group is formed by the first lens 1, the second lens 2 and the third lens 3 before the diaphragm; the rear group is composed of a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7 after diaphragm. The front group mainly reduces the angle of the incident light, so that the light can pass through the diaphragm at a smaller angle, and the rear group is beneficial to controlling distortion and correcting aberration.
In the present invention, the first lens 1 is a convex-concave lens, the fifth lens 5 is a concave-convex lens, the sixth lens 6 is a biconvex lens, and the seventh lens 7 is a convex-concave lens along the object side to image side direction. By the arrangement, the main light can be incident on the surface of the system at a smaller angle, so that tolerance sensitivity of the system is effectively reduced, and the system is more beneficial to processing and production. And when the sixth lens is biconvex, the light smoothly transits from the fifth lens 5 to the seventh lens 7, thereby correcting aberration, controlling distortion and improving relative illuminance.
In the present invention, the effective focal length f of the lens and the entrance pupil diameter D of the lens satisfy the relation: f/D is less than 1.1. By the arrangement, the large aperture of the lens ensures that near infrared rays reflected by an object can be collected to the greatest extent in an environment with weak rays, so that the image surface has enough brightness, information of a detected object can be fully acquired, and the accuracy of three-dimensional space detection is improved.
In the present invention, the effective aperture value F of the off-axis field of view of the lens off Effective aperture value F of on-axis field of view of lens on The relation is satisfied: f (F) off /F on < 1.35. The relation is satisfied, and the near infrared rays reflected by the object can be collected to the greatest extent, meanwhile, enough brightness at the edge of the image surface is ensured, so that the whole brightness of the picture is uniform and excessive from the center to the edge, and the detection precision of the lens to the three-dimensional space is improved.
In the present invention, the half image height IH of the lens and the field angle FOV of the lens satisfy the relation: 3.75 < IH/tan (FOV/2) < 4.0. By the arrangement, the distortion of the optical system is effectively controlled on the premise that the system meets a certain view field angle and image height, and detection errors of the three-dimensional space caused by distortion are reduced to the greatest extent.
In the present invention, along the direction from the object side to the image side, the surfaces of the first lens element 1 to the seventh lens element 7 facing the object side are a first optical surface, the surfaces facing the image side are a second optical surface, and the second optical surface of the first lens element 1 has an effective optical aperture D 1-2 Radius of curvature R of the second optical surface of the first lens 1-2 The relation is satisfied: d is less than 1.35 1-2 /R 1-2 < 1.90. In the present invention, the first lens 1 is curved toward the aperture to form a meniscus-like shape, reducing the incidence height of the chief ray, facilitating correction of the aberration of the off-axis field of view. Meanwhile, the second optical surface of the first lens 1 is not more than a hemisphere, so that the grinding processing of the lens is facilitated, and the yield is improved.
In the present invention, the first optics of the fifth lens 5Radius of curvature R of face 5-1 The method meets the following conditions: -15.00 < R 5-1 -7.50; radius of curvature R of the second optical surface of the fifth lens 5 5-2 The method meets the following conditions: -31.00 < R 5-2 < -9.00; radius of curvature R of the first optical surface of the fifth lens 5 5-1 Radius of curvature R of the second optical surface with the fifth lens 5 5-2 The relation is satisfied: r is more than 1.10 5-2 /R 5-1 < 2.10. In the invention, the fifth lens 5 keeps negative focal power and bends towards the diaphragm in a meniscus shape, so that light beams of all visual fields outside the axis can be transmitted backwards to reach the image surface in a wider caliber, the higher relative illumination of the edge of the image surface relative to the center is ensured, and more detail information in a three-dimensional space can be fully saved.
In the present invention, the effective focal length f1 of the first lens 1 and the effective focal length f of the lens satisfy the relation: -3.00 < f1/f < -1.90; the effective focal length f2 of the second lens 2 and the effective focal length f of the lens satisfy the relation: 4.00 < f2/f < 7.50. In the invention, the optical power of the first lens 1 and the second lens 2 is reasonably distributed, the incidence angle of the off-axis vision field light is effectively reduced, the incidence angle of the off-axis vision field chief ray on each optical surface is reduced, and the aberration of the off-axis vision field is favorably corrected.
In the present invention, the effective focal length f3 of the third lens 3 and the effective focal length f of the lens satisfy the relation: 2.00 < f3/f < 4.00; the effective focal length f4 of the fourth lens 4 and the effective focal length f of the lens satisfy the relation: -30.00 < f4/f < -12.00. In the invention, the focal power of the third lens 3 and the fourth lens 4 is reasonably distributed, the aberration of the off-axis view field can be corrected, and meanwhile, the light beams of all off-axis view fields can be filled with diaphragms in the process of passing through the system, so that the higher relative illuminance of the image surface is ensured.
In the present invention, the effective focal length f5 of the fifth lens 5 and the effective focal length f of the lens satisfy the relation: -24.00 < f5/f < -6.00; the effective focal length f6 of the sixth lens 6 and the effective focal length f of the lens satisfy the relation: f6/f is less than 1.60 and less than 2.30; the effective focal length f7 of the seventh lens 7 and the effective focal length f of the lens satisfy the relation: 4.00 < f7/f < 5.50. In the invention, the focal powers of the fifth lens 5, the sixth lens 6 and the seventh lens 7 are reasonably distributed, so that the light rays of the off-axis view field can smoothly reach the image surface at a smaller angle on the premise of meeting the effective focal length of the system, and the light rays of each view field can keep the light beams as wide as possible in the transmission process, so as to ensure the higher relative illuminance at the edge of the image surface.
In the present invention, the refractive index of the first lens 1 material is nd1, the abbe number is vd1, and the refractive indices satisfy the following conditions: nd1 is more than 1.80 and less than 2.10, and vd1 is more than 17 and less than 35; the refractive index of the material of the fourth lens 4 is nd4, the abbe number is vd4, and the refractive indices respectively satisfy: 1.60 < nd4 < 1.90, 25< vd4 < 64. The first lens 1 and the fourth lens 4 are matched according to the relation range, so that the lens can have higher transmittance in a wider near infrared band, and near infrared rays reflected by an object are collected to the greatest extent.
In the present invention, the seventh lens 7 is a glass aspherical lens, and the refractive index of the material of the seventh lens 7 is nd7, satisfying that nd7 > 1.75. The seventh lens 7 is a glass aspheric lens with high refractive index, can correct aberration control distortion, can reduce the use quantity of glass spherical lenses while guaranteeing optical performance, and realizes the advantages of light weight and total length of the lens.
In the present invention, the sagittal height of the seventh lens 7 satisfies the following relation:
1.00＜SAG1_1.0h/SAG1_0.8h＜1.50
1.60＜SAG1_0.8h/SAG1_0.6h＜1.80
2.0＜SAG1_0.6h/SAG1_0.4h＜2.50
3.00＜SAG1_0.4h/SAG1_0.2h＜4.00
wherein SAG1_1.0h is the sagittal height of the maximum optical effective diameter on the first optical surface of the seventh lens 7, SAG1_0.8h is the sagittal height of the 0.8 times maximum optical effective diameter on the first optical surface of the seventh lens 7, SAG1_0.6h is the sagittal height of the 0.6 times maximum optical effective diameter on the first optical surface of the seventh lens 7, SAG1_0.4h is the sagittal height of the 0.4 times maximum optical effective diameter on the first optical surface of the seventh lens 7, SAG1_0.2h is the sagittal height of the 0.2 times maximum optical effective diameter on the first optical surface of the seventh lens 7. In the invention, the condition that curvature inversion does not occur on the aspherical surface of the glass in the relation is satisfied, the aspherical surface of the glass can be molded by compression molding, meanwhile, the stability of the aspherical surface shape after compression molding is ensured, and the tolerance sensitivity is reduced.
In the present invention, the radius of curvature R of the first optical surface of the seventh lens 7 7-1 The center thickness CT with the seventh lens 7 satisfies the relation: r is more than 2.50 and less than 7-1 CT is less than 3.10; radius of curvature R of the second optical surface of the seventh lens 7 7-2 The center thickness CT with the seventh lens 7 satisfies the relation: r is more than 3.10 and less than 7-2 CT < 5.20. In the invention, the seventh lens 7 bends towards the image surface with positive focal power, so that the light beams of each field of view outside the axis can be well focused on the image surface, namely, the aberration is corrected, and the requirement of image height is met.
In the present invention, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are each made of an optical glass material. All lenses are made of optical glass materials, so that the optical quality of the lenses is improved, and the performance stability of the lenses when working at different temperatures is ensured; and the full glass structure has better mechanical strength, and can be suitable for complex environments.
The following sets of embodiments are given to specifically illustrate the near infrared large aperture lens according to the present invention according to the above-described arrangement of the present invention. Since the near-infrared large aperture lens according to the present invention has seven lenses in total, the seven lenses have 14 faces in total, and the diaphragm S and the plate filter IR have 3 faces in total, 17 faces in total. The 17 faces are arranged in order according to the structural order of the present invention, and for convenience of description, the 17 faces are numbered S1 to S17. In addition, in the following embodiments, the aspherical lens satisfies the following formula:
wherein z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a4, A6, A8, a10, a12 represent fourth-order, sixth-order, eighth-order, and twelfth-order aspheric coefficients, respectively.
Five sets of embodiment data are shown in tables 1 and 2 below:
| conditional expression | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| f/D<1.1 | 1.10 | 1.05 | 1.00 |
| F(off)/F(on)<1.35 | 1.30 | 1.33 | 1.26 |
| 3.75<IH/tan(FOV/2)<4.00 | 4.00 | 3.94 | 3.92 |
| 1.35<D 1-2 /R 1-2 <1.90 | 1.50 | 1.37 | 1.83 |
| -15.00<R 5-1 <-7.50 | -8.00 | -9.23 | -12.73 |
| -30.00<R 5-2 <-9.00 | -9.38 | -15.66 | -20.20 |
| 1.10<R 5-2 /R 5-1 <2.10 | 1.17 | 1.37 | 1.59 |
| -3.00<f1/f<-1.90 | -2.58 | -2.00 | -2.77 |
| 4.00<f2/f<7.50 | 6.69 | 7.38 | 4.49 |
| 2.00<f3/f<4.00 | 2.24 | 2.67 | 3.62 |
| -30.00<f4/f<-12.00 | -17.03 | -15.09 | -12.05 |
| -24.00<f5/f<-6.00 | -23.53 | -20.98 | -8.22 |
| 1.60<f6/f<2.30 | 1.88 | 2.20 | 1.65 |
| 4.00<f7/f<5.50 | 5.32 | 4.04 | 4.89 |
| 1.80<nd1<2.10 | 1.85 | 1.90 | 2.05 |
| 17.00<vd1<35.00 | 32.32 | 28.32 | 26.94 |
| 1.60<nd4<1.90 | 1.72 | 1.86 | 1.62 |
| 25.00<vd4<64.00 | 29.51 | 26.61 | 60.37 |
| nd7>1.75 | 1.80 | 1.75 | 1.85 |
| 1.00<SAG1_1.0h/SAG1_0.8h<1.50 | 1.09 | 1.20 | 1.49 |
| 1.60<SAG1_0.8h/SAG1_0.6h<1.80 | 1.60 | 1.66 | 1.76 |
| 2.0<SAG1_0.6h/SAG1_0.4h<2.50 | 2.04 | 2.19 | 2.49 |
| 3.00<SAG1_0.4h/SAG1_0.2h<4.00 | 3.34 | 3.79 | 3.89 |
| 2.50<R 7-1 /CT<3.10 | 3.01 | 2.91 | 2.61 |
| 3.10<R 7-2 /CT<5.20 | 4.32 | 5.14 | 3.49 |
TABLE 1
TABLE 2
Embodiment one:
fig. 1 schematically shows a block diagram of a near-infrared large aperture lens according to a first embodiment of the present invention.
According to the data given in embodiment 1 in table 1, in the present embodiment, the effective focal length f=4.27 mm, F/# =1.10, the relative illuminance ri= 59.85%, the distortion Dis < 7.50%, the half field angle fov=45 degrees, and the total length ttl=19.65 mm of the near infrared large aperture lens.
Table 3 below lists relevant parameters of the lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number and conic coefficient:
TABLE 3 Table 3
In the present embodiment, the aspherical data is shown in table 4 below:
| aspheric coefficient | A4 | A6 | A8 | A10 | A12 |
| S14 | 3.04E-003 | -1.27E-004 | -1.46E-006 | 7.32E-006 | -2.20E-008 |
| S15 | 3.29E-003 | -3.33E-006 | 6.41E-006 | -2.61E-008 | 1.33E-009 |
TABLE 4 Table 4
Fig. 2 and 3 schematically show a relative illuminance map and a distortion map of the near-infrared large aperture lens according to the present embodiment, respectively.
As can be seen from fig. 2, on the image plane, the relative illuminance of the edge view field is greater than 59.00%, so that the overall brightness of the picture is uniform and excessive from the center to the edge, the acquisition capability of the lens on the three-dimensional space detail information is enhanced, and the detection precision is improved.
As can be seen from fig. 3, the optical distortion of the lens is less than 7.50%, which reduces the difficulty of image processing in the later stage.
Embodiment two:
fig. 4 schematically shows a block diagram of a near infrared large aperture lens according to a second embodiment of the present invention.
According to the data given in embodiment 2 in table 1, in the present embodiment, the effective focal length f=4.24 mm, F/# =1.05, the relative illuminance ri= 56.79%, the distortion Di s < 7.00%, the half field angle fov=47 degrees, and the total length ttl=19.80 mm of the near infrared large aperture lens.
Table 5 below lists relevant parameters of the lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number and conic coefficient:
TABLE 5
In this embodiment, aspherical data is shown in table 6 below:
| aspheric coefficient | A4 | A6 | A8 | A10 | A12 |
| S14 | 3.25E-003 | -1.14E-004 | -9.90E-007 | 8.36E-007 | -2.85E-008 |
| S15 | 3.91E-003 | -2.25E-005 | 1.58E-006 | -3.36E-007 | 3.45E-009 |
TABLE 6
Fig. 5 and 6 schematically show a relative illuminance map and a distortion map of the near-infrared large aperture lens according to the present embodiment, respectively.
As can be seen from fig. 5, on the image plane, the relative illuminance of the edge view field is greater than 56.00%, so that the overall brightness of the picture is uniform and excessive from the center to the edge, the acquisition capability of the lens on the three-dimensional space detail information is enhanced, and the detection precision is improved.
As can be seen from fig. 6, the optical distortion of the lens is less than 7.00%, which reduces the difficulty of image processing in the later stage.
Embodiment III:
fig. 7 schematically shows a structure of a near infrared large aperture lens according to a third embodiment of the present invention.
According to the data given in embodiment 3 in table 1, in the present embodiment, the effective focal length f=4.27 mm, F/# =1.00, the relative illuminance ri=63.00%, the distortion Dis < 7.50%, the half field angle fov=48 degrees, and the total length ttl=20.00 mm of the near infrared large aperture lens.
Table 7 below lists relevant parameters of the lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number and conic coefficient:
TABLE 7
In the present embodiment, the aspherical data is shown in table 8 below:
| aspheric coefficient | A4 | A6 | A8 | A10 | A12 |
| S14 | 1.41E-003 | 6.40E-005 | -1.61E-005 | 6.16E-007 | -1.23E-009 |
| S15 | 6.29E-003 | -3.10E-004 | -8.73E-006 | 4.30E-006 | -1.21E-008 |
TABLE 8
Fig. 8 and 9 schematically show a relative illuminance map and a distortion map of the near-infrared large aperture lens according to the present embodiment, respectively.
As can be seen from fig. 8, on the image plane, the relative illuminance of the edge view field is greater than 63.00%, so that the overall brightness of the picture is uniform and excessive from the center to the edge, the acquisition capability of the lens on the three-dimensional space detail information is enhanced, and the detection precision is improved.
As can be seen from fig. 9, the optical distortion of the lens is less than 7.50%, which reduces the difficulty of image processing in the later stage.
Embodiment four:
fig. 10 schematically shows a structure of a near infrared large aperture lens according to a fourth embodiment of the present invention.
According to the data given in embodiment 4 in table 2, in the present embodiment, the effective focal length f=4.29 mm, F/# =0.95, the relative illuminance ri=63.10%, the distortion Di s < 7.50%, the half field angle fov=49 degrees, and the total length ttl=20.00 mm of the near infrared large aperture lens.
Table 9 below lists relevant parameters of the lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number and conic coefficient:
TABLE 9
In the present embodiment, the aspherical data is shown in table 10 below:
| aspheric coefficient | A4 | A6 | A8 | A10 | A12 |
| S14 | 1.59E-003 | 6.71E-005 | -1.62E-005 | 6.39E-007 | -1.39E-009 |
| S15 | 6.58E-003 | -3.54E-004 | -8.92E-007 | 4.44E-007 | -1.22E-008 |
Table 10
Fig. 11 and 12 schematically show a relative illuminance map and a distortion map of the near-infrared large aperture lens according to the present embodiment, respectively.
As can be seen from fig. 11, on the image plane, the relative illuminance of the edge view field is greater than 63.00%, so that the overall brightness of the picture is uniform and excessive from the center to the edge, the acquisition capability of the lens on the three-dimensional space detail information is enhanced, and the detection precision is improved.
As can be seen from fig. 12, the optical distortion of the lens is less than 7.50%, which reduces the difficulty of image processing in the later stage.
Fifth embodiment:
fig. 13 schematically shows a structure of a near infrared large aperture lens according to a fifth embodiment of the present invention.
According to the data given in embodiment 5 in table 2, in the present embodiment, the effective focal length f=4.28 mm, F/# =0.90, the relative illuminance ri= 62.78%, the distortion Di s < 7.50%, the half field angle fov=50 degrees, and the total length ttl=20.00 mm of the near infrared large aperture lens.
Table 11 below lists relevant parameters of the lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number and conic coefficient:
TABLE 11
In the present embodiment, the aspherical data is shown in table 12 below:
| aspheric coefficient | A4 | A6 | A8 | A10 | A12 |
| S14 | 1.57E-003 | 6.71E-005 | -1.62E-005 | 6.45E-007 | -1.32E-008 |
| S15 | 6.56E-003 | -3.56E-004 | -8.57E-007 | 4.52E-007 | -1.19E-008 |
Table 12
Fig. 14 and 15 schematically show a relative illuminance map and a distortion map of the near-infrared large aperture lens according to the present embodiment, respectively.
As can be seen from fig. 14, on the image plane, the relative illuminance of the edge view field is greater than 62.00%, so that the overall brightness of the picture is uniform and excessive from the center to the edge, the acquisition capability of the lens on the three-dimensional space detail information is enhanced, and the detection precision is improved.
As can be seen from fig. 15, the optical distortion of the lens is less than 7.50%, which reduces the difficulty of image processing in the later stage.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A near infrared large aperture lens, comprising: a first lens (1), a second lens (2), a third lens (3), a stop (S), a fourth lens (4), a fifth lens (5), a sixth lens (6) and a seventh lens (7) which are arranged in order from the object side to the image side along an optical axis; it is characterized in that the method comprises the steps of,
the first lens (1), the fourth lens (4) and the fifth lens (5) are negative power lenses;
the second lens (2), the third lens (3), the sixth lens (6) and the seventh lens (7) are positive power lenses;
the first lens (1) is a convex-concave lens along the direction from the object side to the image side;
the fifth lens (5) is a concave-convex lens;
the sixth lens (6) is a biconvex lens;
the seventh lens (7) is a convex-concave lens;
the effective focal length f of the lens and the entrance pupil diameter D of the lens satisfy the following relation: f/D is less than 1.1;
effective aperture value F of off-axis field of view of the lens off An effective aperture value F of an on-axis field of view of the lens on The relation is satisfied: f (F) off /F on ＜1.35。
2. The near infrared large aperture lens of claim 1, wherein a half image height IH of the lens and a field angle FOV of the lens satisfy the relation: 3.75 < IH/tan (FOV/2) < 4.0.
3. The near-infrared large aperture lens of claim 1, wherein, along a direction from an object side to an image side, surfaces of the first lens (1) to the seventh lens (7) facing the object side are a first optical surface, surfaces facing the image side are a second optical surface, and an optically effective aperture D of the second optical surface of the first lens (1) 1-2 Radius of curvature R of the second optical surface of the first lens 1-2 The relation is satisfied: d is less than 1.35 1-2 /R 1-2 ＜1.9。
4. The near infrared large aperture lens of claim 1, wherein the radius of curvature R of the first optical surface of the fifth lens (5) 5-1 The method meets the following conditions: -15.00 < R 5-1 ＜-7.50；
Radius of curvature R of the second optical surface of the fifth lens (5) 5-2 The method meets the following conditions: -31.00 < R 5-2 ＜-9.00；
Radius of curvature R of the first optical surface of the fifth lens (5) 5-1 Radius of curvature R of the second optical surface of the fifth lens (5) 5-2 The relation is satisfied: r is more than 1.10 5-2 /R 5-1 ＜2.10。
5. The near-infrared large aperture lens according to claim 1, characterized in that the effective focal length f1 of the first lens (1) and the effective focal length f of the lens satisfy the relation: -3.00 < f1/f < -1.90;
the effective focal length f2 of the second lens (2) and the effective focal length f of the lens satisfy the relation: 4.00 < f2/f < 7.50.
6. The near-infrared large aperture lens according to claim 1, characterized in that the effective focal length f3 of the third lens (3) and the effective focal length f of the lens satisfy the relation: 2.00 < f3/f < 4.00;
an effective focal length f4 of the fourth lens (4) and an effective focal length f of the lens satisfy the relation: -30.00 < f4/f < -12.00.
7. The near-infrared large aperture lens according to claim 1, wherein the effective focal length f5 of the fifth lens (5) and the effective focal length f of the lens satisfy the relation: -24.00 < f5/f < -6.00;
an effective focal length f6 of the sixth lens (6) and an effective focal length f of the lens satisfy the relation: f6/f is less than 1.60 and less than 2.30;
an effective focal length f7 of the seventh lens (7) and an effective focal length f of the lens satisfy the relation: 4.00 < f7/f < 5.50.
8. The near-infrared large aperture lens according to claim 1, wherein the refractive index of the first lens (1) material is nd1, the abbe number is vd1, and the refractive index is as follows: nd1 is more than 1.80 and less than 2.10, vd1 is more than 17 and less than 35;
the refractive index of the material of the fourth lens (4) is nd4, the Abbe number is vd4, and the refractive index and the Abbe number respectively satisfy: 1.60 < nd4 < 1.9, 25< vd4 < 64.
9. The near-infrared large aperture lens of claim 1, wherein the seventh lens (7) is a glass aspherical lens, and the refractive index of the seventh lens (7) material is nd7, satisfying that nd7 > 1.75.
10. The near infrared large aperture lens of claim 8, wherein the sagittal height of the seventh lens (7) satisfies the following relation:
1.00＜SAG1_1.0h/SAG1_0.8h＜1.50
1.60＜SAG1_0.8h/SAG1_0.6h＜1.80
2.0＜SAG1_0.6h/SAG1_0.4h＜2.50
3.00＜SAG1_0.4h/SAG1_0.2h＜4.00
wherein SAG1_1.0h is the sagittal height of the maximum optical effective diameter on the first optical surface of the seventh lens (7), SAG1_0.8h is the sagittal height of the 0.8 times maximum optical effective diameter on the first optical surface of the seventh lens (7), SAG1_0.6h is the sagittal height of the 0.6 times maximum optical effective diameter on the first optical surface of the seventh lens (7), SAG1_0.4h is the sagittal height of the 0.4 times maximum optical effective diameter on the first optical surface of the seventh lens (7), SAG1_0.2h is the sagittal height of the 0.2 times maximum optical effective diameter on the first optical surface of the seventh lens (7).
11. The near infrared large aperture lens of claim 1, wherein the radius of curvature R of the first optical surface of the seventh lens (7) 7-1 And the center thickness CT of the seventh lens (7) satisfies the relation: r is more than 2.50 and less than 7-1 /CT＜3.10；
Radius of curvature R of the second optical surface of the seventh lens (7) 7-2 And the center thickness CT of the seventh lens (7) satisfies the relation: r is more than 3.10 and less than 7-2 /CT＜5.20。
12. The near-infrared large aperture lens of claim 1, wherein the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all made of an optical glass material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864575.6A CN108646390B (en) | 2018-08-01 | 2018-08-01 | Near infrared large aperture lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864575.6A CN108646390B (en) | 2018-08-01 | 2018-08-01 | Near infrared large aperture lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108646390A CN108646390A (en) | 2018-10-12 |
| CN108646390B true CN108646390B (en) | 2024-03-19 |
Family
ID=63760579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810864575.6A Active CN108646390B (en) | 2018-08-01 | 2018-08-01 | Near infrared large aperture lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108646390B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021128141A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021128124A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969110A (en) * | 2013-02-19 | 2015-10-07 | 株式会社尼康 | Optical system, optical apparatus, and method for manufacturing optical system |
| CN105445913A (en) * | 2014-09-19 | 2016-03-30 | 富士胶片株式会社 | Imaging lens and imaging apparatus |
| CN107797261A (en) * | 2017-11-20 | 2018-03-13 | 嘉兴中润光学科技有限公司 | Dynamic Photography camera lens |
| CN208421388U (en) * | 2018-08-01 | 2019-01-22 | 舜宇光学(中山)有限公司 | Near-infrared large aperture camera lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5932415B2 (en) * | 2012-03-15 | 2016-06-08 | キヤノン株式会社 | Optical system and imaging apparatus having the same |
-
2018
- 2018-08-01 CN CN201810864575.6A patent/CN108646390B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969110A (en) * | 2013-02-19 | 2015-10-07 | 株式会社尼康 | Optical system, optical apparatus, and method for manufacturing optical system |
| CN105445913A (en) * | 2014-09-19 | 2016-03-30 | 富士胶片株式会社 | Imaging lens and imaging apparatus |
| CN107797261A (en) * | 2017-11-20 | 2018-03-13 | 嘉兴中润光学科技有限公司 | Dynamic Photography camera lens |
| CN208421388U (en) * | 2018-08-01 | 2019-01-22 | 舜宇光学(中山)有限公司 | Near-infrared large aperture camera lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108646390A (en) | 2018-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102455486B (en) | Ultra wide-angle lens | |
| CN109031617B (en) | Image pickup optical lens group and image capturing device | |
| CN108873270B (en) | Glass-plastic mixed prime lens | |
| CN108318995B (en) | Lens system and lens | |
| CN114217416B (en) | optical lens | |
| JP6711361B2 (en) | Imaging lens | |
| CN109085694B (en) | Five-piece type wide-angle lens group | |
| CN113484995A (en) | Large-aperture athermalized 8MP glass-plastic hybrid lens | |
| CN112526711A (en) | Optical system | |
| CN113109926A (en) | Low-distortion optical system and lens | |
| CN217385968U (en) | Fixed focus lens | |
| CN108646390B (en) | Near infrared large aperture lens | |
| CN109143555B (en) | Zoom lens | |
| CN108983402B (en) | Large aperture lens | |
| CN110737080B (en) | Thin imaging lens group | |
| CN216083236U (en) | Fixed focus lens | |
| CN114019652B (en) | Wide-angle large-target-surface small-distortion optical prime lens | |
| CN212160211U (en) | Optical imaging system | |
| CN213780517U (en) | Optical imaging lens | |
| CN210323549U (en) | Fixed focus lens | |
| CN209895076U (en) | Fixed focus lens | |
| CN210199390U (en) | Fixed focus lens | |
| CN114578527A (en) | Super wide-angle lens | |
| CN110596871B (en) | High-resolution large-aperture motion DV lens | |
| CN110727079B (en) | Optical 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 |