CN206074892U - Focus lens in a kind of long-focus - Google Patents
Focus lens in a kind of long-focus Download PDFInfo
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- CN206074892U CN206074892U CN201621054060.2U CN201621054060U CN206074892U CN 206074892 U CN206074892 U CN 206074892U CN 201621054060 U CN201621054060 U CN 201621054060U CN 206074892 U CN206074892 U CN 206074892U
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Abstract
This utility model provides focus lens in a kind of long-focus, includes front lens group, diaphragm, focusing lens set and rear lenses group from the object side to the image side successively；Wherein, the front lens group includes the first lens, the second lens, the 3rd lens and the 4th lens from the object side to the image side successively, and first lens, the second lens and the 3rd lens are plus lens, and the 4th lens are negative meniscus of the concave surface towards image space；The focusing lens set includes the 5th lens and the 6th lens from the object side to the image side successively, and the 5th lens are plus lens, and the 6th lens are bi-concave minus lenses, and the 5th lens and the 6th lens constitute concave surface and bear balsaming lenss towards one group of image space；The rear lenses group includes the 7th lens and the 8th lens from the object side to the image side successively, and the 7th lens are minus lenses, and the 8th lens are plus lens, and the 7th lens and the 8th lens constitute one group of positive balsaming lens.In the slr camera long-focus that this utility model is provided, focus lens have larger aperture, larger field, good imaging quality on the premise of ensureing height as matter.
Description
Technical field
This utility model is related to camera lens field, focus lens in more particularly to a kind of slr camera long-focus.
Background technology
The life that digital photographing, shooting product give people adds endless fast happy color.Digital single-lens reflex camera standard
Extremely shutterbugs and Professional Photography man pursue tight shot always, and existing tight shot mostly adopts double gauss optical system
System.Double gauss optical system is a kind of objective lens arrangement with larger market, and which easily realizes larger relative aperture and longer
Focal length, is used for photograph, images, and as camera lens object lens in the precision instrument such as plate-making, has two cemented surfaces for disappearing in its structure
Except aberration.But existing double gauss structure has still suffered from very big defect, back work distance is not enough, and each aberration is all than larger, typically
Be required for designer big change to be compared to curvature, interval and glass material, various precision optical instruments are made with this
Image-forming objective lens.Meanwhile, existing camera tight shot its double gauss optical system structure in standard-sized sheet aperture, the height of full filed
The contrast and resolution of level aberration effects image quality, affects actually used.Digital single-lens reflex camera tight shot is extremely taken the photograph always
Shadow fan and Professional Photography man pursue, but long tight shot involves great expense on the market, and image quality is poor.
Utility model content
For problem above, this utility model patent purpose is to devise focus lens in a kind of long-focus, is being ensured
Height is as having larger aperture, larger field, good imaging quality on the premise of matter.
This utility model is achieved through the following technical solutions：
Focus lens in a kind of long-focus, from the object side to the image side successively include front lens group, diaphragm, focusing lens set and
Rear lenses group；Wherein, the front lens group includes the first lens, the second lens, the 3rd lens from the object side to the image side successively
With the 4th lens, first lens, the second lens and the 3rd lens are plus lens, and the 4th concave lens surface is towards image space
Negative meniscus；
The focusing lens set includes the 5th lens and the 6th lens from the object side to the image side successively, and the 5th lens are for just
Lens, the 6th lens are bi-concave minus lenses, and the 5th lens and the 6th lens constitute concave surface and bear glue towards one group of image space
Close lens；
The rear lenses group includes the 7th lens and the 8th lens from the object side to the image side successively, and the 7th lens are negative
Lens, the 8th lens are plus lens, and the 7th lens and the 8th lens constitute one group of positive balsaming lens.
Specifically, the first lens described in the utility model, the second lens, the 3rd lens and the 4th lens meet following public
Formula：
1.4f<f1<2f, 1.1f<f2<1.6f, 0.5f<f3<0.8f, 0.3f<∣f4∣<0.6f,
Wherein, f is the total focal length of the focus lens, f1, f2, f3 be respectively first lens, the second lens, the 3rd
The focal length ， ∣ f4 ∣ of lens are the focal length absolute value of the 4th lens.
Specifically, the 3rd lens described in the utility model and the 4th lens meet below equation：
1<∣r7/r6∣<1.5, r6>0, r7>0,
Wherein, r6 is the radius of curvature of the image side surface of the 3rd lens, and r7 is the song of the thing side of the 4th lens
Rate radius.
Specifically, the 5th lens described in the utility model and the 6th lens constitute below one group of negative balsaming lenss satisfaction public affairs
Formula：
0.5f<∣f56∣<0.8f；r9<0, r11>0,
Wherein, f is the total focal length of the focus lens, and ∣ f56 ∣ are that the 5th lens and the 6th lens constitute one group of negative gluing
The focal length absolute value of lens, r9 are the radius of curvature of the thing side of the 5th lens, and r11 is the song of the image side surface of the 6th lens
Rate radius.
Specifically, the 7th lens described in the utility model and the 8th lens constitute below one group of positive balsaming lenss satisfaction public affairs
Formula：
0.5f<f78<0.8f；r12>0, r14<0,
Wherein, f is the total focal length of the focus lens, and f78 is the positive gluing of the 7th lens and the 8th lens composition
The combined focal length of lens, r12 are the radius of curvature of the thing side of the 7th lens, and r14 is the image side surface of the 8th lens
Radius of curvature.
Description of the drawings
Referring to the drawings this utility model embodiment is described further, wherein：
Fig. 1 is the structure chart of focus lens in a kind of long-focus of this utility model.
In figure, each several part title is as follows：
The first lens of L1～L8-～the 8th lens；The two sides of the first lens of P1, P 2-；The two of P 3, the second lens of P 4-
Face；The two sides of P 5, the 3rd lens of P 6-；The two sides of P 7, the 4th lens of P 8-；P 9, P 10, P 11- the 5th and the 6th are glued
Three faces of eyeglass；Three faces of P 12, P 13, P 14- the 7th and the 8th balsaming lenss；SP- diaphragms；PW- image planes.
Specific embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
The utility model proposes focus lens in a kind of long-focus, refer to Fig. 1, include successively from the object side to the image side front
Lens group, diaphragm SP, focusing lens set and rear lenses group；Wherein, the front lens group is wrapped from the object side to the image side successively
Include the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4, the first lens L1, the second lens L2 and
Three lens L3 are plus lens, and the 4th lens L4 is negative meniscus of the concave surface towards image space；PW is image planes；P1, P 2 be
The two sides of the first lens；The two sides of P 3, P 4 for the second lens；The two sides of P 5, P 6 for the 3rd lens；P 7, P 8 are the 4th
The two sides of lens；Three faces of P 9, P 10, P 11 for the 5th and the 6th cemented doublet；P 12, P 13, P 14 are the 7th and the 8th
Three faces of balsaming lenss；
The focusing lens set includes the 5th lens L5 and the 6th lens L6, the 5th lens from the object side to the image side successively
L5 is plus lens, and the 6th lens L6 is bi-concave minus lenses, and the 5th lens L5 and the 6th lens L6 composition concave surfaces are towards picture
The negative balsaming lenss of a group of side；
The rear lenses group includes the 7th lens L7 and the 8th lens L8, the 7th lens from the object side to the image side successively
L7 is minus lenses, and the 8th lens L8 is plus lens, and it is saturating that the 7th lens L7 and the 8th lens L8 constitutes one group of positive gluing
Mirror.
First lens L1 described in the utility model, the second lens L2, the 3rd lens L3 and the 4th lens L4, meet following public
Formula：
(1)1.4f<f1<2f, (2) 1.1f<f2<1.6f, (3) 0.5f<f3<0.8f, (4) 0.3f<∣f4∣<0.6f,
Wherein, f is the total focal length of the focus lens, f1, f2, f3 be respectively first lens, the second lens, the 3rd
The focal length of lens.∣ f4 ∣ are the focal length absolute value of the 4th minus lenses.Above-mentioned restrictive condition (1) (2) is for ensureing that optical system has
Than larger back work distance, and for controlling spherical aberration and coma.If exceed the lower limit of condition (1), or the upper limit of condition (2),
Though being conducive to reducing imaging astigmatism and the curvature of field, it is unfavorable for the reduction of spherical aberration；Equally, if exceeding the upper limit of condition (3), or bar
The lower limit of part (4), optical system back work distance increase, but system imaging quality seldom arrives correction.Condition (1) and (2) cause
The positive light coke of system is shifted from front to back, and in the case where material is certain, positive light coke is moved from front to back, meets system school
After positive aberration condition, system front portion negative power also reduces, and spherical aberration correction of checking colors is favourable.Wherein the first lens L1, the second lens
L2, the 3rd lens L3 employ low dispersion, it is ensured that the spherochromatism of whole lens system.
3rd lens L3 and the 4th lens L4 described in the utility model meets below equation：
(5)1<∣r7/r6∣<1.5, (6) r6>0 (concave surface), r7>0；(convex surface)；
Wherein, r6 is 6 radius of curvature of image side surface P of the 3rd lens, and r7 is the thing side P 7 of the 4th lens
Radius of curvature.
3rd lens L3 and the 4th lens L4 be the focus lens than more sensitive part, in order to correct spherochromatism and axle
Outer spherical aberration, can be conducive to the correction of spherochromatism if more than formula (5) lower limit, but for oblique spherical aberration can become unfavorable.And
The correction of oblique spherical aberration can be then conducive to more than formula (5) upper limit, but can be unfavorable to spherochromatism.
The necessary focal length of negative balsaming lenss of the 5th lens L5 described in the utility model and the 6th lens L6 compositions is negative and full
Sufficient below equation：
(7)0.5f<∣f56∣<0.8f；r9<0 (concave surface), r11>0 (concave surface)；
Wherein, f is that the total focal length ， ∣ f56 ∣ of the focus lens are the 5th lens L5 and the 6th lens L6 is constituted
The focal length absolute value of negative balsaming lenss, r9 are the radius of curvature of the thing side of the 5th lens, and r11 is the image side of the 6th lens
The radius of curvature in face.The negative cemented doublet group for focusing lens set, when object distance from it is infinite as far as closely focus when, from left to right
Mobile negative balsaming lenss are capable of achieving shape library, eliminate the lengthy and tedious of the whole lens focusing of movement.The negative cemented doublet group is necessary
Meet formula (7), because the negative cemented doublet group is focusing lens group, if focal length is acted on just, not have focusing.
It is just and full that 7th lens L7 described in the utility model and the 8th lens L8 constitutes the focal length of one group of positive balsaming lens
Sufficient below equation：
(8)0.5f<f78<0.8f；r12>0 (convex surface), r14<0 (convex surface)；
Wherein, f78 is the combined focal length of positive balsaming lenss, and r12 is the radius of curvature of the thing side of the 7th lens,
R14 is the radius of the image side surface of the 8th lens.
The positive balsaming lenss of the 7th lens L7 and the 8th lens L8 compositions are positive focal length lens group, the positive balsaming lenss and picture
To fix, i.e., back work distance is from for fixed range in the distance between face.r14<0 is not reflected for the reflective of last one side as far as possible
To imaging surface, so as to reduce the impact of ghost or glare.
Embodiment one：
The focal length of the optical system of the one embodiment in a kind of long-focus that this utility model is provided in focus lens is
100mm, 24 ° of the angle of visual field, relative aperture 1:2, in infinity, its structural parameters and material parameter are shown in Table 1 to object distance：
1 embodiment of table, one structural parameters and material parameter
The above specific embodiment of the present utility model, does not constitute the restriction to this utility model protection domain.
Any various other corresponding change made according to technology design of the present utility model and deformation, should be included in practical
In new scope of the claims.
Claims (5)
1. focus lens in a kind of long-focus, it is characterised in that include front lens group, diaphragm, right from the object side to the image side successively
Focus lens group and rear lenses group；Wherein, the front lens group from the object side to the image side successively include the first lens (L1), second
Lens (L2), the 3rd lens (L3) and the 4th lens (L4), first lens, the second lens and the 3rd lens are plus lens,
4th lens are negative meniscus of the concave surface towards image space；
The focusing lens set includes the 5th lens (L5) and the 6th lens (L6), the 5th lens from the object side to the image side successively
For plus lens, the 6th lens are bi-concave minus lenses, the 5th lens and the 6th lens one group towards image space of concave surface of composition
Negative balsaming lenss；
The rear lenses group includes the 7th lens (L7) and the 8th lens (L8), the 7th lens from the object side to the image side successively
For minus lenses, the 8th lens are plus lens, and the 7th lens and the 8th lens constitute one group of positive balsaming lens.
2. focus lens in a kind of long-focus according to claim 1, it is characterised in that first lens, second saturating
Mirror, the 3rd lens and the 4th lens meet below equation：
1.4f<f1<2f, 1.1f<f2<1.6f, 0.5f<f3<0.8f, 0.3f<∣f4∣<0.6f,
Wherein, f is the total focal length of the focus lens, and f1, f2, f3 are respectively first lens, the second lens, the 3rd lens
Focal length ， ∣ f4 ∣ be the 4th lens focal length absolute value.
3. focus lens in a kind of long-focus according to claim 1, it is characterised in that the 3rd lens and the 4th saturating
Mirror meets below equation：
1<∣r7/r6∣<1.5, r6>0, r7>0,
Wherein, r6 is the radius of curvature of the image side surface of the 3rd lens, and r7 is the curvature half of the thing side of the 4th lens
Footpath.
4. focus lens in a kind of long-focus according to claim 1, it is characterised in that the 5th lens and the 6th saturating
Microscope group meets below equation into one group of negative balsaming lens：
0.5f<∣f56∣<0.8f；r9<0, r11>0,
Wherein, f is the total focal length of the focus lens, and ∣ f56 ∣ are the negative balsaming lenss of the 5th lens and the 6th lens composition
Focal length absolute value, r9 are the radius of curvature of the thing side of the 5th lens, and r11 is the curvature half of the image side surface of the 6th lens
Footpath.
5. focus lens in a kind of long-focus according to claim 1, it is characterised in that the 7th lens and the 8th saturating
Microscope group meets below equation into one group of positive balsaming lens：
0.5f<f78<0.8f；r12>0, r14<0,
Wherein, f is the total focal length of the focus lens, and f78 is the positive balsaming lenss of the 7th lens and the 8th lens composition
Combined focal length, r12 is the radius of curvature of the thing side of the 7th lens, and r14 is the song of the image side surface of the 8th lens
Rate radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054060.2U CN206074892U (en) | 2016-09-13 | 2016-09-13 | Focus lens in a kind of long-focus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054060.2U CN206074892U (en) | 2016-09-13 | 2016-09-13 | Focus lens in a kind of long-focus |
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| Publication Number | Publication Date |
|---|---|
| CN206074892U true CN206074892U (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621054060.2U Expired - Fee Related CN206074892U (en) | 2016-09-13 | 2016-09-13 | Focus lens in a kind of long-focus |
Country Status (1)
| Country | Link |
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Cited By (5)
| 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 |
| CN109946814A (en) * | 2017-12-20 | 2019-06-28 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN110068916A (en) * | 2019-06-06 | 2019-07-30 | 南京华群光电技术有限公司 | A kind of 360 deg inner hole donut-like visual field optical system |
| CN111025592A (en) * | 2019-12-28 | 2020-04-17 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| WO2021128380A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Optical camera lens |
-
2016
- 2016-09-13 CN CN201621054060.2U patent/CN206074892U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946814A (en) * | 2017-12-20 | 2019-06-28 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| 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 |
| CN110068916A (en) * | 2019-06-06 | 2019-07-30 | 南京华群光电技术有限公司 | A kind of 360 deg inner hole donut-like visual field optical system |
| CN111025592A (en) * | 2019-12-28 | 2020-04-17 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| WO2021128380A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Optical camera lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170405 Termination date: 20200913 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |