CN208580256U - Telephoto lens - Google Patents
Telephoto lens Download PDFInfo
- Publication number
- CN208580256U CN208580256U CN201821113313.8U CN201821113313U CN208580256U CN 208580256 U CN208580256 U CN 208580256U CN 201821113313 U CN201821113313 U CN 201821113313U CN 208580256 U CN208580256 U CN 208580256U
- Authority
- CN
- China
- Prior art keywords
- lens
- telephoto
- meets
- efl
- focal length
- 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
Landscapes
- Lenses (AREA)
Abstract
A kind of telephoto lens, along optical axis direction from object side to image side successively include: the first lens group, diaphragm and the second lens group, in which: the second lens group include at least one piece of non-spherical lens or two pieces of cemented doublets.This optical device, which solves the curvature of field and coma, influences long focus optical system and is obviously improved the image quality of entire picture, has the small depth of field and biggish enlargement ratio.
Description
Technical field
The utility model relates to a kind of technologies in optical device field, and in particular to a kind of telephoto lens.
Background technique
At present for the high definition camera lens of remote small target surface long-focus, generally substituted with civilian single-lens reflex camera class telephoto lens.
This kind of lens design target surface is big, and resolution ratio will be greatly reduced on small target surface image device, and structure is complicated, expensive,
Therefore need to design a special small target surface, structure is simple, cheap and high image quality telephoto lens, dedicated for remote
Capture apart from object detail.For telephoto lens, the curvature of field and coma are the main differences for influencing phase matter, and the curvature of field and coma are got over
Greatly, the image quality decline of peripheral field is more severe, therefore it is difficult to ensure that the entire uniform good image quality of visual field, with this
Meanwhile if entire illuminance of image plane is uneven, center is bright compared with periphery brightness very much, and imaging edge will appear dark angle, influences picture
The clarity of face entirety.
Utility model content
The utility model proposes a kind of telephoto lens aiming at the problem that existing long focus optical system, solves the curvature of field and intelligent
Difference influences long focus optical system and is obviously improved the image quality of entire picture, this optical device has the small depth of field and biggish puts
Big multiplying power.
The utility model is achieved through the following technical solutions:
The utility model along optical axis direction from object side to image side successively include: the first lens group, diaphragm and the second lens group,
Wherein: the second lens group includes at least one piece of non-spherical lens or two pieces of cemented doublets.
First lens group includes: that at least three pieces lens with positive light coke and two pieces are saturating with negative power
Mirror, specifically: the first lens with positive light coke, the second lens with positive light coke, the third with negative power are saturating
Mirror, the 4th lens with positive light coke and the 5th lens with negative power, in which: the third lens and the 4th lens composition
Cemented doublet.
Preferably, refractive index satisfaction 1.62 < Nd < 1.64 of the third lens, 63.79 < Vd of Abbe number satisfaction <
65.38；Rear lens refractive index meets 1.465 < Nd < 1.5, and Abbe number meets 76.75 < Vd < 81.61.
Preferably, the combined focal length of the cemented doublet meets -1.42 < f34/EFL < -0.84, to reduce camera lens
Tolerance sensitivity.
Preferably, first lens meet: 4.85 < SAG1/CTG1 < 5.20, in which: SAG1 is the object of the first lens
The rise of side, CTG1 are the center thickness of the first lens, and the incidence angle of chief ray on imaging surface can be reduced by meeting above formula requirement
Degree, chip matching degree with higher.
Preferably, the focal length of first lens and the second lens meets: 0.29 < f1/EFL < 0.32,0.30 < f2/
EFL < 0.33, in which: f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens, meets above-mentioned relation formula and wants
Ask the miniaturization for guaranteeing camera lens while being conducive to take into account focal length characteristic.
Second lens group is realized using following any structure:
1. two pieces of cemented doublets,
2. one piece of non-spherical lens and one piece of cemented doublet,
3. one piece of non-spherical lens and two pieces of lens.
The non-spherical lens is preferably plastic aspherical element eyeglass, and refractive index meets Nd=1.63, and Abbe number meets
Vd=23.62 can reduce the color difference and coma of telephoto lens using plastic aspherical element.
The 7th lens in two pieces of lens meet: f7/EFL=-0.12.
8th lens meet: f8/EFL=0.08, refractive index Nd=1.9459, Abbe number meet Vd=17.98,
When increasing one piece of high-refractivity and low-dispersion spheric glass, color difference and the curvature of field are effectively improved.
The diaphragm is aperture diaphragm.
The image side is equipped with image acquisition element, and protection glass is equipped with before the image acquisition element.
The telephoto lens meets: 1.97 < EFL/TTL < 2.02, in which: EFL is the effective focal length of telephoto lens, TTL
For distance on the object side to the axis of image planes of the first lens.
Technical effect
Compared with prior art, the utility model is less than focal length, knot using remote type optical facilities, the overall length of optical lens is taken the photograph
Structure is compact, has the small depth of field and larger enlargement ratio, the collocation of reasonable optical texture and lens materials, so that difference correction is good
Good, entire visual field has consistent image quality, and tolerance sensitivities are low, suitable for mass production.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of telephoto lens in embodiment 1；
Fig. 2 is chromatic curve figure on the axis of telephoto lens in embodiment 1 and distortion schematic diagram；
Fig. 3 is the relative illumination schematic diagram of telephoto lens in embodiment 1；
Fig. 4 is the structural schematic diagram of telephoto lens in embodiment 2；
Fig. 5 is chromatic curve figure on the axis of telephoto lens in embodiment 2 and distortion schematic diagram；
Fig. 6 is the relative illumination schematic diagram of telephoto lens in embodiment 2；
Fig. 7 is the structural schematic diagram of telephoto lens in embodiment 3；
Fig. 8 be implement 3 in telephoto lens axis on chromatic curve figure and distortion schematic diagram；
Fig. 9 is the relative illumination schematic diagram of telephoto lens in embodiment 3；
In figure: first to the 7th lens L1~L7, first to the 18th surface s1~s18, diaphragm S, protection glass CG, at
Image planes IMG.
Specific embodiment
Embodiment 1
As shown in Figure 1 to Figure 3, present embodiment discloses the telephoto lens of 70mm a kind of, along optical axis direction from object side extremely
Image side successively includes: the first lens group, diaphragm S, the second lens group, protection glass CG and image planes IMG.
In first lens group: the first lens L1 is moon protruding spherical lens, including the first spherical surface s1 (convex surface) and the
Two spherical surface s2 (concave surface)；Second lens L2 is biconvex spherical lens, including third spherical surface s3 (convex surface) and the 4th spherical surface s4 is (convex
Face)；The third lens L3 is moon protruding spherical lens, including the 5th spherical surface s5 (convex surface) and the 6th spherical surface s6 (concave surface)；4th lens
L4 is biconvex spherical lens, including the 6th spherical surface s6 (convex surface) and the 7th spherical surface s7 (concave surface)；5th lens L5 is concave-concave spherical surface
Lens, including the 8th spherical surface s8 (concave surface) and the 9th spherical surface s9 (concave surface), wherein the third lens L3 and the 4th lens L4 are combined into
First cemented doublet.
Second lens group includes two pieces of cemented doublets, in which: second cemented doublet L61, L62 is that moon concave spherical surface is saturating
Mirror, including the 11st spherical surface s11 (concave surface) and the 13rd spherical surface (concave surface)；Third cemented doublet L71, L72 are that moon convex spherical is saturating
Mirror, including the 14th spherical surface s14 (concave surface) and the 16th spherical surface (convex surface)
The diaphragm is located on object space position, between the first lens group and the second lens group
The present embodiment camera lens design parameter such as following table
Table 1
The effective focal length of the present embodiment camera lens is EFL=80mm, relative aperture F=8, the overall length TTL of entire optical system
For 40mm, structure such as Fig. 1.
The present embodiment meets EFL/TTL=2.0, in which: EFL is the effective focal length of telephoto lens, and TTL is the first lens
Distance on object side to the axis of image planes.
The third lens L3 is glass lens, and refractive index meets Nd=1.62, and Abbe number meets Vd=63.88；
4th lens L4 is glass lens, and refractive index meets Nd=1.50, and Abbe number meets Vd=76.75, and combined focal length meets
F34/EFL=-1.05.
As shown in Fig. 2, for chromaticity difference diagram and distortion curve on the axis of telephoto lens described in the present embodiment.Chromaticity difference diagram on axis
Indicate that different-waveband deviates the degree of ideal position of practising physiognomy in different light port diameters, horizontal axis indicates offset, and longitudinal axis expression is returned
The one pupil bore changed.It is 0.05mm in 0.75 pupil band 587nm and 852nm wavelength horizontal axis distance in figure.Distortion figure indicates practical
The difference of image height and ideal image height.Horizontal axis indicates that distortion percentage, the longitudinal axis indicate half image height.The present embodiment is abnormal as seen from the figure
Become within 1.0%, in general, human eye is the torsional deformation that shooting object can not be identified.
As shown in figure 3, the full filed relative illumination curve graph of the present embodiment telephoto lens.As can be seen from the figure in full filed model
In enclosing, relative illumination is all larger than 90%, uniform-illumination of practising physiognomy, without dark angle possibility.
Embodiment 2
As shown in Figures 4 to 6, compared with Example 1, the third lens L3 is concave-concave spheric glass to the present embodiment, including
5th spherical surface s5 (concave surface) and the 6th spherical surface s6 (concave surface).
The second lens group in the present embodiment includes: the 6th lens L6, balsaming lens L71, L72, in which: the 6th lens are
The aspherical lens of concave-concave, including the 11st aspherical s11 (concave surface) and the 12nd aspherical s12 (concave surface)；Balsaming lens L7
For moon protruding spherical lens, including the 14th spherical surface s14 (concave surface) and the 16th spherical surface (convex surface) s16.
The present embodiment camera lens design parameter such as following table
Table 2:
In the present embodiment, the 6th lens L6 uses plastic aspherical element, in which: non-spherical lens coefficient meets:
| K | A (4 level number) | B (6 level number) | C (8 level number) | D (ten level numbers) | |
| s11 | 63.93741 | -0.00384281 | 0.000341568 | 1.36215E-05 | -1.95425E-06 |
| s12 | -57.173 | -0.001498529 | -8.54273E-05 | 6.6344E-05 | -9.14827E-06 |
Curvature corresponding to the aspheric radius surface of the tenth the one side s11 and s12 of the 6th lens L6 is c, lens measure
It to distance of optical axis is some r on face, the quadratic surface constant of lens surface is K, the quadravalence in the tenth one side and the 12nd face, six
Rank, eight ranks, ten rank asphericity coefficients are respectively A, B, C, D.By using plastic aspheric lens, reduce eyeglass number, and
And color difference on aspherical good correction axis, ensure the difference balance between infrared light and blue light.
The effective focal length of the present embodiment camera lens is EFL=80mm, relative aperture F=7.8, the overall length of entire optical system
TTL is 39.5mm.
The present embodiment meets EFL/TTL=2.02, in which: EFL is the effective focal length of telephoto lens, and TTL is the first lens
Object side to the axis of image planes on distance.
The present embodiment the third lens L3 is glass lens, and refractive index meets Nd=1.64, and Abbe number meets Vd=
65.38；4th lens L4 is glass lens, and refractive index meets Nd=1.4651, and Abbe number meets Vd=79.82, organizes focus
Away from meeting f34/EFL=-0.84.
As shown in figure 5, for chromaticity difference diagram and distortion curve on the axis of telephoto lens described in the present embodiment.Chromaticity difference diagram on axis
Indicate that different-waveband deviates the degree of ideal position of practising physiognomy in different light port diameters, horizontal axis indicates offset, and longitudinal axis expression is returned
The one pupil bore changed.In figure, it is less than 0.05mm in 0.75 pupil band 587nm and 852nm wavelength horizontal axis distance.Distortion figure indicates real
The difference of border image height and ideal image height.Horizontal axis indicates that distortion percentage, the longitudinal axis indicate half image height.The present embodiment as seen from the figure
Distortion is within 1.0%, and in general, human eye is the torsional deformation that shooting object can not be identified.
As shown in fig. 6, being the full filed relative illumination curve graph of the present embodiment telephoto lens.It can be seen that in figure in full filed
In range, relative illumination is all larger than 90%, uniform-illumination of practising physiognomy, without dark angle possibility.
Embodiment 3
As shown in Figure 7 to 9, compared with Example 2, the second lens are biconvex spherical lens to the present embodiment, including the
Three spherical surface s3 (convex surface) and the 4th spherical surface s4 (concave surface)；5th lens are concave-concave spheric glass, including the 8th spherical surface s8 (concave surface)
With the 9th spherical surface s9 (concave surface).
The second lens group in the present embodiment includes: the 6th lens L6, the 7th lens L7 and the 8th lens L8, in which: the
Six lens are the aspherical lens of concave-concave, including the 11st aspherical s11 (concave surface) and the 12nd aspherical s12 (concave surface)；The
Seven lens L7 are concave-concave spherical lens, including the 14th spherical surface s13 (concave surface) and the 14th spherical surface s14 (concave surface)；8th lens
L8 is biconvex spherical lens, including the 14th spherical surface s15 (convex surface) and the 14th spherical surface s16 (convex surface).
The 8th lens L8 can be in high refractive index and low dispersion spheric glass, hence it is evident that improves axis colouring
Difference and reduce distortion.
The present embodiment camera lens design parameter such as following table
Table 3
In the present embodiment, the 6th lens L6 uses plastic aspherical element, in which: non-spherical lens coefficient meets:
| K | A (4 level number) | B (6 level number) | C (8 level number) | D (10 level number) | |
| s11 | 51.332383 | -0.006445029 | 0.000922435 | -4.0428E-05 | 6.60023E-06 |
| s12 | -24.29006 | -0.001519887 | -0.000118653 | 0.000112657 | -1.36619E-05 |
Curvature corresponding to the aspheric radius surface of the tenth the one side s11 and s12 of the 6th lens L6 is c, lens measure
It to distance of optical axis is some r on face, the quadratic surface constant of lens surface is K, the quadravalence in the tenth one side and the 12nd face, six
Rank, eight ranks, ten rank asphericity coefficients are respectively A, B, C, D.
The effective focal length of the present embodiment camera lens is EFL=80mm, relative aperture F=8.1, the overall length of entire optical system
TTL is 40.6mm, structure such as Fig. 7.
The present embodiment meets EFL/TTL=1.97, in which: EFL is the effective focal length of telephoto lens, and TTL is the first lens
Object side to the axis of image planes on distance.
The third lens L3 is glass lens in the present embodiment, and refractive index meets Nd=1.619, and Abbe number meets Vd=
63.79；4th lens L4 is glass lens, and refractive index meets Nd=1.497, and Abbe number meets Vd=81.61, combined focal length
Meet f34/EFL=-1.4.
As shown in figure 8, for chromaticity difference diagram and distortion curve on the axis of telephoto lens described in the present embodiment.Chromaticity difference diagram on axis
Indicate that different-waveband deviates the degree of ideal position of practising physiognomy in different light port diameters, horizontal axis indicates offset, and longitudinal axis expression is returned
The one pupil bore changed.In figure, almost approached in 0.75 pupil band 587nm and 852nm wavelength horizontal axis distance, no color differnece.Distortion figure
Indicate the difference of practical image height and ideal image height.Horizontal axis indicates that distortion percentage, the longitudinal axis indicate half image height.This reality as seen from the figure
The distortion of example is applied within 0.5%, it is almost undistorted.
As shown in figure 9, being the full filed relative illumination curve graph of the present embodiment telephoto lens.It can be seen that in figure in full filed
In range, relative illumination is all larger than 90%, uniform-illumination of practising physiognomy, without dark angle possibility.
The utility model uses reasonable optical facilities, and the overall length of optical lens is less than focal length, compact-sized, has small scape
Deep and larger enlargement ratio is the imaging lens for being suitble to shooting distant place scenery and miniaturization.Reasonable optical texture and eyeglass material
The collocation of material, so that difference correction is good, entire visual field has consistent image quality, and tolerance sensitivities are low, is suitble to batch raw
It produces.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the utility model principle and objective with
Different modes carries out local directed complete set to it, and the protection scope of the utility model is subject to claims and not by above-mentioned specific
Implementation is limited, and each implementation within its scope is by the constraint of the utility model.
Claims (9)
1. a kind of telephoto lens, which is characterized in that along optical axis direction from object side to image side successively include: the first lens group, diaphragm
With the second lens group, in which: the second lens group includes at least one piece of non-spherical lens or two pieces of cemented doublets；
Second lens group is realized using following any structure:
1. two pieces of cemented doublets,
2. one piece of non-spherical lens and one piece of cemented doublet,
3. one piece of non-spherical lens and two pieces of lens.
2. telephoto lens according to claim 1, characterized in that first lens group, which includes: at least three pieces, to be had
The lens of the lens of positive light coke and two pieces with negative power, specifically: the first lens with positive light coke, with positive light
Second lens of focal power, the third lens with negative power, the 4th lens with positive light coke and with negative power
5th lens, in which: the third lens and the 4th lens are at cemented doublet.
3. telephoto lens according to claim 2, characterized in that 1.62 < Nd of refractive index satisfaction of the third lens <
1.64, Abbe number meets 63.79 < Vd < 65.38；Rear lens refractive index meets 1.465 < Nd < 1.5, and Abbe number meets 76.75 < Vd
<81.61。
4. telephoto lens according to claim 2, characterized in that the combination of the cemented doublet in first lens group
Focal length meets -1.42 < f34/EFL < -0.84, to reduce the tolerance sensitivity of camera lens.
5. telephoto lens according to claim 2, characterized in that first lens meet: 4.85 < SAG1/CTG1 <
5.20, in which: SAG1 is the rise of the object side of the first lens, and CTG1 is the center thickness of the first lens, meets above formula requirement
The incident angle of chief ray on imaging surface, chip matching degree with higher can be reduced.
6. telephoto lens according to claim 2 or 5, characterized in that the focal length of first lens and the second lens
Meet: 0.29 < f1/EFL < 0.32,0.30 < f2/EFL < 0.33, in which: f1 is the effective focal length of the first lens, and f2 is second saturating
The effective focal length of mirror meets the miniaturization for guaranteeing camera lens while above-mentioned relation formula requires to be conducive to take into account focal length characteristic.
7. telephoto lens according to claim 1, characterized in that the non-spherical lens is plastic aspherical element eyeglass,
Its refractive index meets Nd=1.63, and Abbe number meets Vd=23.62, using plastic aspherical element can reduce telephoto lens color difference and
Coma.
8. telephoto lens according to claim 1, characterized in that the 7th lens and the 8th in two pieces of lens are thoroughly
Mirror meets respectively: f7/EFL=-0.12, f8/EFL=0.08.
9. according to telephoto lens described in any of the above-described claim, characterized in that the telephoto lens meets: 1.97 <
EFL/TTL < 2.02, in which: EFL be telephoto lens effective focal length, TTL be the first lens object side to the axis of image planes on away from
From.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821113313.8U CN208580256U (en) | 2018-07-13 | 2018-07-13 | Telephoto lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821113313.8U CN208580256U (en) | 2018-07-13 | 2018-07-13 | Telephoto lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208580256U true CN208580256U (en) | 2019-03-05 |
Family
ID=65510479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821113313.8U Active CN208580256U (en) | 2018-07-13 | 2018-07-13 | Telephoto lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208580256U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646393A (en) * | 2018-07-13 | 2018-10-12 | 嘉兴中润光学科技有限公司 | Telephoto lens |
-
2018
- 2018-07-13 CN CN201821113313.8U patent/CN208580256U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646393A (en) * | 2018-07-13 | 2018-10-12 | 嘉兴中润光学科技有限公司 | Telephoto lens |
| CN108646393B (en) * | 2018-07-13 | 2024-03-29 | 嘉兴中润光学科技股份有限公司 | Long focus lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202854391U (en) | Image lens assembly | |
| CN202904111U (en) | Optical photographing lens system | |
| CN108519660B (en) | Super wide-angle lens | |
| CN105700119B (en) | Imaging lens system, image capturing device and electronic device | |
| CN102890330A (en) | Optical image pickup lens | |
| CN105700117B (en) | A kind of optical imaging system | |
| CN106291887A (en) | A kind of fish eye lens | |
| CN105807400A (en) | Super-large-aperture wide-angle lens of single lens reflex camera | |
| CN110261999A (en) | Optical system and imaging lens | |
| CN108646393A (en) | Telephoto lens | |
| CN112526728A (en) | Fixed focus lens | |
| CN110609380B (en) | Lens | |
| CN208654420U (en) | Ultra-wide angle optical camera lens group | |
| CN208026983U (en) | Wide-aperture lens optical system without thermalization | |
| CN108196355B (en) | Optics tight shot | |
| CN201654312U (en) | High pixel wide-angle pick-up lens | |
| CN208580256U (en) | Telephoto lens | |
| CN108845417A (en) | One kind disappears parallax machine vision optical system | |
| CN210742599U (en) | Starlight-level optical lens | |
| CN108267845A (en) | Wide-aperture lens optical system without thermalization | |
| CN205374852U (en) | Low distortion optical imaging system of high picture | |
| CN108732720B (en) | Large-relative-aperture fisheye lens applicable to photography | |
| CN106291880A (en) | A kind of large aperture ultra-thin Radix Rumicis mobile lens | |
| CN214225558U (en) | Fixed focus lens | |
| CN109239893A (en) | A kind of low chief ray incidence angles ultra-wide angle optical system and its working method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | "change of name, title or address" |
Address after: 314000 No.188, Taojing Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee after: Jiaxing Zhongrun Optical Technology Co.,Ltd. Address before: 314000 Room 2F201-6, Building 6, Jiaxing Photovoltaic Science Park, 1288 Kanghe Road, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee before: JIAXING ZHONGRUN OPTICAL SCIENCE AND TECHNOLOGY Co.,Ltd. |
|
| CP03 | "change of name, title or address" |