CN107092081B - Large-aperture long-focus optical lens - Google Patents
Large-aperture long-focus optical lens Download PDFInfo
- Publication number
- CN107092081B CN107092081B CN201710537271.4A CN201710537271A CN107092081B CN 107092081 B CN107092081 B CN 107092081B CN 201710537271 A CN201710537271 A CN 201710537271A CN 107092081 B CN107092081 B CN 107092081B
- Authority
- CN
- China
- Prior art keywords
- lens
- focal length
- optical lens
- optical
- coefficient
- 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 title claims abstract description 71
- 230000005499 meniscus Effects 0.000 claims description 45
- 239000002759 woven fabric Substances 0.000 claims 5
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 238000012634 optical imaging Methods 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 description 12
- 239000010902 straw Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
- 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 large aperture long focal length optical lens, which is characterized in that: an optical lens front group A (3), a grating C (4), an optical lens rear group B (5) and an optical compensation sheet D (6) are sequentially arranged from the object plane (1) to the image plane (2), and the ratio of the focal length fA of the optical lens front group A (3) to the focal length f of the optical lens system meets the condition: -5mm and < -fA/f < -3.5mm, and the ratio of the focal length fB of the optical lens rear group B (5) to the focal length f of the optical lens system satisfies the condition: 1mm & ltfB/f & lt 1.5mm, the large-aperture long-focus optical imaging system can be used for long-distance monitoring and effectively blurring the background and effectively highlighting the main body, and the perspective deformation of the image is relatively small.
Description
[ technical field ] A
The invention relates to a large-aperture long-focus optical lens.
[ background of the invention ]
Various fixed-focus monitoring lenses are already available in the market, most of the fixed-focus monitoring lenses have a relative aperture of more than 2.0 and are wide-angle lenses with angles of about 120 degrees or more, and for some occasions, images which are far away need to be shot and monitored, a main body of the focusing lens which is far away cannot be highlighted, the image distortion is large, the peripheral illumination is low, and the image is not clear.
In view of the above problems, it is necessary to provide a solution thereto, and the present invention has been made in such a context.
[ summary of the invention ]
The technical problem to be solved by the present invention is to provide a large aperture long focal length optical lens, aiming at the defects in the prior art, the large aperture long focal length optical imaging system can be used for remote monitoring, more effectively blurring the background and effectively highlighting the main body, and the perspective deformation of the image is also small, compared with the large aperture imaging system with an aperture of 1.6. The confocal characteristics of monitoring lens day night still can guarantee high-quality formation of image even under the condition of insufficient light or night, reaches the 4M quality. Meanwhile, high-quality imaging can be realized at the ambient temperature of low temperature of 40 ℃ below zero and high temperature of 85 ℃.
In order to realize the purpose, the invention adopts the following technical scheme:
a large-aperture long-focal-length optical lens is provided with an optical lens front group A, a grating C, an optical lens rear group B and an optical compensation sheet D in sequence from an object plane to an image plane, wherein the ratio of the focal length fA of the optical lens front group A to the focal length f of an optical lens system meets the following conditions: -5 and f A/f < -3.5, wherein the ratio of the focal length f B of the optical lens rear group B to the focal length f of the optical lens system meets the condition: 1 is woven so as to have f B/f <1.5.
As described above, the front optical lens group a includes the left meniscus lens A1 and the right meniscus lens A2, the rear optical lens group B includes the double convex lens B1, the double concave lens B2, and the double convex lens B3, and the double concave lens B2 and the double convex lens B3 are a cemented lens group.
The air interval a1 between the optical lens front group a and the optical lens rear group B as described above satisfies the condition: 0.08mm-woven (A1) -woven (1.1mm), and an air space A2 between the left meniscus lens A1 and the right meniscus lens A2 satisfies the condition: 2.0 mm-plus-a 2-plus-3.5 mm, and an air space a3 between the biconvex lens B1 and the cemented combination of the biconcave lens B2 and the biconvex lens B3 satisfies the condition: 0.6 mm-straw-a3-straw-2 mm.
The air space a4 between the right meniscus lens A2 and the biconcave lens B2 as described above satisfies the condition: 3.0 mm-straw (a 4) -straw (5.5 mm).
As described above, the focal length f1 of the left meniscus lens A1, the focal length f2 of the right meniscus lens A2, the focal length f3 of the double convex lens B1, the focal length f4 of the double concave lens B2, and the focal length f5 of the double convex lens B3 satisfy the following relations: -22 yarn bundles f1/f2< -19, -3 yarn bundles f4/f3<0, -3 yarn bundles f4/f5<0.
As described above, the abbe number vd1 of the left meniscus lens A1, the abbe number vd2 of the right meniscus lens A2, the abbe number vd3 of the double convex lens B1, the abbe number vd4 of the double concave lens B2, and the abbe number vd5 of the double convex lens B3 satisfy the following relations: 53< -vd1 < -60 >, 20< -vd2 < -58 >, 58< -vd3 < -70 >, 20< - (vd 4-vd 5) <35.
As described above, the thickness of the left meniscus lens A1 is T1, the thickness of the right meniscus lens A2 is T2, the thickness of the double convex lens B1 is T3, the thickness of the double concave lens B2 is T4, the thickness of the double convex lens B3 is T5, the total length of the large-aperture long-focal-length optical lens is TTL, and the thicknesses of T1, T2, T3, T4, T5 and TTL satisfy the following relations: 2< T2/T1 <3,3 < T5/T4 < 4,9 < TTL/T3 < 12,6 < TTL/T2 < 8,8 < TTL/T5 < 10.
The biconvex lens B1 is a spherical lens as described above; the left meniscus lens A1, the right meniscus lens A2, the biconcave lens B2 and the biconvex lens B3 are aspheric lenses, and the surface shapes of the aspheric lenses satisfy the following equation:
in the formula, a parameter c is the curvature corresponding to the radius, y is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conic section coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; alpha (alpha) ("alpha") 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate.
The invention has the beneficial effects that:
1. the optical lens system of the invention is provided with an optical lens front group A, a grating C, an optical lens rear group B and an optical compensation sheet D in sequence from an object plane to an image plane, wherein the focal length fA of the optical lens front group A meets the following conditions: -20mm < -f A < -15mm, and the focal length f B of the optical lens rear group B meets the condition: 6mm & lt f B & lt 9mm, and the total optical length is greatly compressed, so that the total length TTL of an optical system with the focal length f >6mm is less than 22.5mm, wherein the left meniscus lens A1 of the lens is a plastic aspheric lens, the double-convex lens B1 is a spherical lens, and the optical imaging system realizes long-distance large-aperture imaging.
2. In the optical structure of the present invention, an abbe number vd1 of the left meniscus lens A1, an abbe number vd2 of the right meniscus lens A2, an abbe number vd3 of the double convex lens B1, an abbe number vd4 of the double concave lens B2, and an abbe number vd5 of the double convex lens B3 satisfy the following relations: 53< -vd1 < -60 >, 20< -vd2 < -58, 58< -vd3 < -70 >, 20< - (vd 4-vd 5) <35; effectively reducing the chromatic aberration image brought by the broadband, and ensuring the day and night confocal function.
3. The invention has the advantages of uniform image surface, high brightness and large aperture.
4. The system adopts a structure of a glass spherical surface and a plastic non-spherical surface, so that the geometric transfer function of the optical system is greatly improved, the requirement of high-quality imaging in high and low temperature environments is met, and compared with a monitoring lens with the same function and the same performance, the manufacturing cost is greatly saved.
[ description of the drawings ]
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic diagram of the optical path of the present invention.
[ detailed description ] embodiments
The present invention is described in further detail below with reference to the attached drawing figures.
The left meniscus lens A1 is denoted by 31, the right meniscus lens A2 by 32, the double convex lens B1 by 51, the double concave lens B2 by 52, and the double convex lens B3 by 53.
As shown in fig. 1 to 2, a large aperture long focal length optical lens is sequentially provided with an optical lens front group A3, a grating C4, an optical lens rear group B5, and an optical compensator D6 from an object plane 1 to an image plane 2, wherein a ratio of a focal length fA of the optical lens front group A3 to a focal length f of an optical lens system satisfies a condition: -5< -fA/f < -3.5, and the ratio of the focal length f B of the optical lens rear group B5 to the focal length f of the optical lens system satisfies the condition: 1< -fB/f <1.5, the large-aperture long-focus optical imaging system can be used for long-distance monitoring and can effectively obscure a main body by blurring a background and reduce the perspective deformation of an image compared with the large-aperture imaging system with the aperture of 1.6. The confocal characteristics of monitoring lens day night still can guarantee high-quality formation of image even under the condition of light shortage or night, reaches the 4M quality. Meanwhile, high-quality imaging can be realized at the ambient temperature of low temperature of 40 ℃ below zero and high temperature of 85 ℃.
As shown in fig. 1 and fig. 2, in this embodiment, the front optical lens group A3 includes a left meniscus lens A1 and a right meniscus lens A2, the rear optical lens group B5 includes a biconvex lens B1, a biconcave lens B2 and a biconvex lens B3, and the biconcave lens B2 and the biconvex lens B3 are cemented lens groups.
As shown in fig. 1 and 2, in the present embodiment, an air space a1 between the optical lens front group A3 and the optical lens rear group B5 satisfies a condition: 0.08mm-woven (A1) -woven (1.1mm), and an air space A2 between the left meniscus lens A1 and the right meniscus lens A2 satisfies the condition: 2.0 mm-plus-a 2-plus-3.5 mm, and an air space a3 between the biconvex lens B1 and the cemented combination of the biconcave lens B2 and the biconvex lens B3 satisfies the condition: 0.6 mm-straw-a3-straw-2 mm.
As shown in fig. 1 and 2, in the present embodiment, an air space a4 between the right meniscus lens A2 and the biconcave lens B2 satisfies a condition: 3.0 mm-straw (a 4) -straw (5.5 mm).
As shown in fig. 1 and fig. 2, in this embodiment, the focal length f1 of the left meniscus lens A1, the focal length f2 of the right meniscus lens A2, the focal length f3 of the double convex lens B1, the focal length f4 of the double concave lens B2, and the focal length f5 of the double convex lens B3 satisfy the following relations: -22 yarn bundles f1/f2< -19, -3 yarn bundles f4/f3<0, -3 yarn bundles f4/f5<0.
As shown in fig. 1 and fig. 2, in this embodiment, the abbe number vd1 of the left meniscus lens A1, the abbe number vd2 of the right meniscus lens A2, the abbe number vd3 of the double convex lens B1, the abbe number vd4 of the double concave lens B2, and the abbe number vd5 of the double convex lens B3 satisfy the following relations: 53-straw-vsd 1-straw 60, 20-straw-vsd 2-straw 58, 58-straw-vsd 3-straw 70, 20-vsd 4-vsd 5-straw 35 can satisfy the balance between visible spectrum and infrared spectrum, correct chromatic aberration, make the system have better imaging effect in 535nm-850nm spectrum, realize day and night confocal, eliminate purple boundary problem of imaging under visible, and is suitable for 400-ten thousand high pixel camera adaptation system, and realize high illumination clear imaging.
As shown in fig. 1 and 2, in this embodiment, the thickness of the left meniscus lens A1 is T1, the thickness of the right meniscus lens A2 is T2, the thickness of the biconvex lens B1 is T3, the thickness of the biconcave lens B2 is T4, the thickness of the biconvex lens B3 is T5, the total length of the large aperture long focal length optical lens is TTL, and the T1, T2, T3, T4, T5, TTL satisfy the following relations: 2< T2/T1 <3,3 < T5/T4 < 4,9 < TTL/T3 < 12,6 < TTL/T2 < 8,8 < TTL/T5 < 10, the total optical length is greatly compressed, an optical system with the focal length f greater than 6mm is enabled, and the total length TTL is less than 22.5mm. The left meniscus lens A1 of the lens is a plastic aspheric lens, and the biconvex lens B1 is a spherical lens. The optical imaging system realizes long-distance large-aperture imaging.
As shown in fig. 1 and 2, in the present embodiment, the biconvex lens B1 is a spherical lens; the left meniscus lens A1, the right meniscus lens A2, the biconcave lens B2 and the biconvex lens B3 are aspheric lenses, and the surface shapes meet the equation:
in the formula, a parameter c is the curvature corresponding to the radius, y is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conic section coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; alpha is alpha 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate.
As shown in fig. 1 and fig. 2, in the present embodiment, the large aperture long focal length optical lens system focal length f satisfies: f is larger than 6mm, the large-aperture long-focus optical imaging system can be used for remote monitoring and effectively blurring the background and effectively highlighting the main body, and the perspective deformation of the image is small compared with the large-aperture imaging system with the aperture of 1.6. The confocal characteristics of monitoring lens day night still can guarantee high-quality formation of image even under the condition of insufficient light or night, reaches the 4M quality. Meanwhile, high-quality imaging can be realized at the ambient temperature of low temperature of 40 ℃ below zero and high temperature of 85 ℃.
Claims (6)
1. A large aperture long focal length optical lens, characterized by: the optical lens system is characterized by comprising an optical lens front group A (3), a grating C (4), an optical lens rear group B (5) and an optical compensation sheet D (6) which are sequentially arranged from an object plane (1) to an image plane (2), wherein the ratio of the focal length fA of the optical lens front group A (3) to the focal length f of the optical lens system meets the condition: -5 and f A/f < -3.5, and the ratio of the focal length fB of the optical lens rear group B (5) to the focal length f of the optical lens system satisfies the condition: 1< -f B/f <1.5, the front optical lens group a (3) is composed of a left meniscus lens A1 (31) and a right meniscus lens A2 (32), the rear optical lens group B (5) is composed of a biconvex lens B1 (51), a biconcave lens B2 (52) and a biconvex lens B3 (53), the biconcave lens B2 (52) and the biconvex lens B3 (53) are a cemented lens group, the focal length f1 of the left meniscus lens A1 (31), the focal length f2 of the right meniscus lens A2 (32), the focal length f3 of the biconvex lens B1 (51), the focal length f4 of the biconcave lens B2 (52), and the focal length f5 of the biconvex lens B3 (53) satisfy the relationship: -22 yarn bundles f1/f2< -19, -3 yarn bundles f4/f3<0, -3 yarn bundles f4/f5<0.
2. The large aperture long focal length optical lens of claim 1, wherein: an air space a1 between the optical lens front group a (3) and the optical lens rear group B (5) satisfies a condition: 0.08mm-woven fabric A1-woven fabric 1.1mm, an air space A2 between the left meniscus lens A1 (31) and the right meniscus lens A2 (32) satisfies the condition: 2.0 mm-plus-a 2-plus-3.5 mm, and an air space a3 between the lenticular lens B1 (51) and the cemented set of the biconcave lens B2 (52) and the lenticular lens B3 (53) satisfies the condition: 0.6 mm-straw-a3-straw-2 mm.
3. The large aperture long focal length optical lens of claim 2, wherein: an air space a4 between the right meniscus lens A2 (32) and the biconcave lens B2 (52) satisfies a condition: 3.0 mm-a 4-5.5 mm.
4. The large aperture long focal length optical lens of claim 1, wherein: the abbe number vd1 of the left meniscus lens A1 (31), the abbe number vd2 of the right meniscus lens A2 (32), the abbe number vd3 of the double convex lens B1 (51), the abbe number vd4 of the double concave lens B2 (52), and the abbe number vd5 of the double convex lens B3 (53) satisfy the following relations: 53-yarn vsd 1 yarn-woven fabric 60, 20-yarn vsd 2 yarn-woven fabric 58, 58-yarn vsd 3 yarn-woven fabric 70,20< (vd 4-vd 5) <35.
5. The large aperture long focal length optical lens of claim 1, wherein: the thickness of the left meniscus lens A1 (31) is T1, the thickness of the right meniscus lens A2 (32) is T2, the thickness of the double convex lens B1 (51) is T3, the thickness of the double concave lens B2 (52) is T4, the thickness of the double convex lens B3 (53) is T5, the total length of the large-aperture long-focal-length optical lens is TTL, and the T1, the T2, the T3, the T4, the T5 and the TTL satisfy the relation: 2< T2/T1 <3,3 < T5/T4 < 4,9 < TTL/T3 < 12,6 < TTL/T2 < 8,8 < TTL/T5 < 10.
6. The large aperture long focal length optical lens of claim 1, wherein: the biconvex lens B1 (51) is a spherical lens; the left meniscus lens A1 (31), the right meniscus lens A2 (32), the biconcave lens B2 (52), and the biconvex lens B3 (53) are aspheric lenses, and the surface shapes satisfy the equation:
in the formula, a parameter c is the curvature corresponding to the radius, y is a radial coordinate, the unit of y is the same as the unit of the length of the lens, and k is a conic section coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface curve of the lens is ellipse, when the k coefficient is equal to 0, the surface curve of the lens is circle, when the k coefficient is equal to 0When the k coefficient is more than 0, the surface-shaped curve of the lens is oblate; alpha (alpha) ("alpha") 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate. />
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710537271.4A CN107092081B (en) | 2017-07-04 | 2017-07-04 | Large-aperture long-focus optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710537271.4A CN107092081B (en) | 2017-07-04 | 2017-07-04 | Large-aperture long-focus optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107092081A CN107092081A (en) | 2017-08-25 |
| CN107092081B true CN107092081B (en) | 2023-04-18 |
Family
ID=59641128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710537271.4A Active CN107092081B (en) | 2017-07-04 | 2017-07-04 | Large-aperture long-focus optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107092081B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI429980B (en) * | 2011-05-11 | 2014-03-11 | Largan Precision Co Ltd | Image capturing lens assembly |
| CN207133495U (en) * | 2017-07-04 | 2018-03-23 | 中山联合光电科技股份有限公司 | A kind of large aperture long focal length optical lens system |
-
2017
- 2017-07-04 CN CN201710537271.4A patent/CN107092081B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107092081A (en) | 2017-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110133828B (en) | Fixed focus lens | |
| CN110794552B (en) | Optical lens | |
| CN106597641B (en) | Small-sized low-cost 4MP athermal prime lens | |
| US11733483B2 (en) | Optical lens assembly and imaging device including seven lenses of −+−++−+ or −+−+−++ refractive powers | |
| CN109581620B (en) | Optical lens | |
| CN110632736B (en) | Optical lens | |
| CN109960020B (en) | Optical lens | |
| CN110412721B (en) | Optical lens | |
| CN210348046U (en) | Fisheye lens | |
| CN108490581A (en) | A kind of small distortion imaging system of large aperture ultra-wide angle | |
| CN110568590A (en) | Starlight-level optical lens and imaging method thereof | |
| CN108681035A (en) | Super large aperture tight shot | |
| CN210072173U (en) | Wide-angle day and night confocal athermalization optical system and camera module applying same | |
| CN211955960U (en) | Optical imaging lens with fixed focus and low chromatic aberration | |
| CN109425959B (en) | Optical lens | |
| CN106680973B (en) | Miniaturized large-view-field high-definition athermal prime lens | |
| CN110412723B (en) | Optical lens | |
| CN109975952B (en) | Optical lens | |
| CN107092081B (en) | Large-aperture long-focus optical lens | |
| CN216083236U (en) | Fixed focus lens | |
| CN110441888B (en) | Fixed focus lens | |
| CN210199392U (en) | Wide-angle lens | |
| CN112433346A (en) | Large-aperture optical system | |
| CN209895076U (en) | Fixed focus lens | |
| CN207133495U (en) | A kind of large aperture long focal length optical lens system |
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 |