CN107884912A - The fixed times double telecentric optical system of one kind - Google Patents
The fixed times double telecentric optical system of one kind Download PDFInfo
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- CN107884912A CN107884912A CN201711302506.8A CN201711302506A CN107884912A CN 107884912 A CN107884912 A CN 107884912A CN 201711302506 A CN201711302506 A CN 201711302506A CN 107884912 A CN107884912 A CN 107884912A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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Abstract
The present invention relates to the fixed times double telecentric optical system of one kind, in the optical system of the camera lens along light from left to right incident direction be sequentially provided with preceding group, diaphragm C, rear group, it is described before group include that the focal power that sets gradually is positive biconvex lens G 1, focal power is positive meniscus shaped lens G 2, focal power is negative biconcave lens G 3, focal power is positive meniscus shaped lens G 4；The focal power that group includes setting gradually after described is negative meniscus shaped lens G 5, focal power is positive meniscus shaped lens G 6, focal power is positive biconvex lens G 7, focal power is negative meniscus shaped lens G 8, simple in construction.
Description
Technical field
The present invention relates to the fixed times double telecentric optical system of one kind.
Background technology
There are various industrial lens to be applied to machine vision and field of industry detection, but these industrial mirrors in the market
Head is generally all difficult to close-in measurement and volume weight, the depth of field are small, and identical can not be kept to amplify under different object distances scope
Multiplying power is imaged, and is caused image scaled distortion, is caused the collimation error.In commercial measurement, object puts height by external condition
Influence, various external interferences can all change object height, and common telecentric lens can not also realize the parallax that disappears under different object distances
Function, while because such lens edge distortion presence image border is deformed, reduce measurement accuracy.
The content of the invention
The purpose of the present invention is to be directed to above weak point, there is provided a kind of fixed times doubly telecentric optical system simple in construction
System.
The technical scheme is that a kind of fixed times double telecentric optical system, along light in the optical system of the camera lens
From left to right incident direction be sequentially provided with preceding group, diaphragm C, rear group, it is described before group include the focal power that sets gradually to be positive double
Convex lens G-1, focal power are positive meniscus shaped lens G-2, focal power is negative biconcave lens G-3, focal power is positive bent moon
Shape lens G-4；The focal power that group includes setting gradually after described is negative meniscus shaped lens G-5, focal power is positive falcate
Lens G-6, focal power are positive biconvex lens G-7, focal power is negative meniscus shaped lens G-8.
Further, the preceding group focal power is that group focal power is negative just, afterwards；Group focal power is saturating for negative concave-concave before described
Mirror G-3 forms gluing unit with focal power for positive meniscus shaped lens G-4, and its total focal power is negative, mainly undertakes school spherical aberration and color
The effect of difference；After described group focal power be positive biconvex lens G-7 and focal power to be that negative meniscus shaped lens G-8 is formed glued
Group, its total focal power is just.
Further, the air spacing between the biconvex lens G-1 to meniscus shaped lens G-2 is 12.6mm, falcate
The distance between lens G-2 to biconcave lens G-3 is the glue pellet that 0.4mm, biconcave lens G-3 and meniscus shaped lens G-4 are formed
Positive G-4 to diaphragm C distance be 24.8mm, diaphragm C to meniscus shaped lens G-5 spacing is 0.1mm, meniscus shaped lens G-
5 to meniscus shaped lens G-6 distance is that 15.5mm, meniscus shaped lens G-6 to biconvex lens G-7 and meniscus shaped lens G-8 are formed
The positive G-7 distance of glue pellet be 8.1mm.
Further, the preceding group focal power is that positive meniscus shaped lens G-2 concave surfaces bend towards diaphragm, and preceding group of focal power is negative
Biconcave lens G-3 and focal power the cemented surface of gluing unit formed for positive meniscus shaped lens G-4 bend towards diaphragm；Group light after described
Focal power is that positive meniscus shaped lens G-6 concave surfaces bend towards diaphragm, rear to organize that focal power is positive biconvex lens G-7 and focal power is negative
The cemented surface that meniscus shaped lens G-8 forms gluing unit bends towards diaphragm.
Further, the distance of preceding group to rear group of the camera lens is 24.9mm, and preceding group of focal power organizes the ratio between focal power with rear
For 2.0.
Compared with prior art, the invention has the advantages that：Structure is simplified, small volume, in light weight, low abnormal
The advantages such as change, the high depth of field and high-resolution, imaging multiplying power is inconsistent caused by can solving external shock interference in field depth
The problem of, technical guarantee is provided for Precision measurement field, is applicable among a variety of detection fields.
Brief description of the drawings
Patent of the present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the optical system diagram of the embodiment of the present invention.
Fig. 2 is modulation transfer function curve map in 30lp/mm of the embodiment of the present invention；
Fig. 3 is modulation transfer function curve map in 50lp/mm of the embodiment of the present invention；
Fig. 4 is modulation transfer function curve map in 80lp/mm of the embodiment of the present invention；
Fig. 5 is the point range figure of the embodiment of the present invention；
Fig. 6 is the curvature of field and distortion figure of the embodiment of the present invention；
Fig. 7 is the illuminance of image plane curve map of the embodiment of the present invention.
In figure：
C diaphragm C, G-1 biconvex lens G-1, G-2 meniscus shaped lens G-2, G-3 biconcave lens G-3, G-4 meniscus shaped lenses G-4,
G-5 meniscus shaped lens G-5, G-6 meniscus shaped lens G-6, G-7 biconvex lens G-7, G-8 meniscus shaped lenses G-8.
Embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
As shown in Fig. 1~7, the fixed times double telecentric optical system of one kind, along light from left-hand in the optical system of the camera lens
Right incident direction be sequentially provided with preceding group, diaphragm C, rear group, it is described before group to include the focal power that sets gradually be positive biconvex lens
G-1, focal power are positive meniscus shaped lens G-2, focal power is negative biconcave lens G-3, focal power is positive meniscus shaped lens
G-4；The focal power that group includes setting gradually after described is negative meniscus shaped lens G-5, focal power is positive meniscus shaped lens G-
6th, focal power be positive biconvex lens G-7, focal power be negative meniscus shaped lens G-8.
In the present embodiment, the preceding group focal power is that group focal power is negative just, afterwards；Group focal power is negative pair before described
Concavees lens G-3 forms gluing unit with focal power for positive meniscus shaped lens G-4, and its total focal power is negative, mainly undertakes school spherical aberration
With the effect of aberration；Group focal power is positive biconvex lens G-7 after described and focal power is that negative meniscus shaped lens G-8 forms glue
Charge-coupled, its total focal power is just.
In the present embodiment, the air spacing between the biconvex lens G-1 to meniscus shaped lens G-2 is 12.6mm, curved
The distance between moon-shaped lens G-2 to biconcave lens G-3 is the glue that 0.4mm, biconcave lens G-3 and meniscus shaped lens G-4 are formed
The distance for closing the positive G-4 to diaphragm C of piece is 24.8mm, and diaphragm C to meniscus shaped lens G-5 spacing is 0.1mm, and falcate is saturating
Mirror G-5 to meniscus shaped lens G-6 distance is 15.5mm, meniscus shaped lens G-6 to biconvex lens G-7 and meniscus shaped lens G-8
The positive G-7 of the glue pellet of composition distance is 8.1mm.
In the present embodiment, the preceding group focal power is that positive meniscus shaped lens G-2 concave surfaces bend towards diaphragm, preceding group of focal power
Diaphragm is bent towards for the cemented surface that negative biconcave lens G-3 and focal power are positive meniscus shaped lens G-4 composition gluing units；After described
Group focal power is that positive meniscus shaped lens G-6 concave surfaces bend towards diaphragm, rear to organize that focal power is positive biconvex lens G-7 and focal power is
The cemented surface that negative meniscus shaped lens G-8 forms gluing unit bends towards diaphragm.
In the present embodiment, the distance of preceding group to rear group of the camera lens is 24.9mm, preceding group of focal power and rear group focal power
The ratio between be 2.0.
In the present embodiment, the optical system being made up of above-mentioned lens set has reached following optical index：
Object space operating distance=111mm, numerical aperture NA=0.026, enlargement ratio β=0.5, object space and image space telecentricity≤
0.02 °, optical distortion≤- 0.006%, relative illumination >=98.6%（φ11mm）；
The camera lens overall length TTL≤123.6mm, optic back focal >=22mm；
Compatible 2/3 " the inch of the fixed times doubly telecentric camera lens（φ11mm）, Pixel size be 3.45um industrial chip use；
In the present embodiment, a fixed times double telecentric optical system possesses following characteristics：When system focal length is f, optical system from a left side to
The focal length of right eyeglass is followed successively by f1, f2, f3, f4, f5, f6, f7, f8. wherein：
0.017 ＜ f1/f ＜ 0.021；
0.02 ＜ f2/f ＜ 0.024；
- 0.01 ＜ f3/f ＜ -0.006；
0.01 ＜ f4/f ＜ 0.015；
- 0.015 ＜ f5/f ＜ -0.009；
0.01 ＜ f6/f ＜ 0.017；
0.004 ＜ f7/f ＜ 0.006；
- 0.01 ＜ f8/f ＜ -0.006；
In the present embodiment, the parameter of each eyeglass is as shown in the table：
In the present embodiment, its object space telecentricity≤0.02, image space telecentricity≤0.02, thing are understood by the doubly telecentric performance parameter
The chief ray of square light beam and image space light beam can make its imaging enlargement ratio in field depth constant not each parallel to optical axis
Become, while image space telecentricity makes the illumination of its image planes more uniform, ensure that the stability of imaging, improves whole detection performance,
It can be applied among various complicated industrial detection environment；Its optical distortion≤- 0.006%, mirror are understood by doubly telecentric performance parameter
Head overall length TTL≤123.6mm, therefore the doubly telecentric camera lens can effectively control the distortion rate of detection image, less overall length ensures
It possesses good applicability, while the camera lens is seemed attractive in appearance compact；The camera lens is understood by the feature of doubly telecentric camera lens
Possess the excellent properties such as the wide depth of field, low distortion, high-resolution.
In the present embodiment, it is positive lenticular that the present invention is sequentially provided with focal power along light incident direction as shown in Figure 1
Mirror G-1, focal power are positive meniscus shaped lens G-2, focal power is negative biconcave lens G-3, focal power is that positive falcate is saturating
Mirror G-4, focal power are negative meniscus shaped lens G-5, focal power is positive meniscus shaped lens G-6, focal power is positive lenticular
Mirror G-7, focal power are negative meniscus shaped lens G-8.Wherein, diaphragm C is located in the image space focal plane of preceding system system, is located at simultaneously
Afterwards in the object space focal plane of system system, doubly telecentric light path is formed；Preceding group of biconvex lens G-1 is using lanthanide material, meniscus shaped lens
G-2 is using the glue pellet that dense barium flint material, preceding group of biconcave lens G-3 and meniscus shaped lens G-4 are formed from group of the lanthanides and weight lanthanum
The material adapted of system；It is double using lanthanide material, rear group using dense flint material, meniscus shaped lens G-6 that meniscus shaped lens G-5 is organized afterwards
The glue pellet that convex lens G-7 is formed with meniscus shaped lens G-8 is then arranged in pairs or groups from two heavy lanthanide materials, and such combination can
With abundant spherical aberration corrector and aberration, while remain the characteristic of symmetrical structure aberration cancellation.
In the present embodiment, understand biography letter value of the camera lens in 30lp/mm close to 0.8 by Fig. 2, Fig. 3, Fig. 4；
Biography letter value when 50lp/mm reaches 0.6；Biography letter value in 80lp/mm is 0.4, therefore the camera lens has excellent resolution energy
Power.It can be seen that the camera lens aberration obtains good correction by the point spread function figure of Fig. 5 doubly telecentric camera lenses, each visual field is more
Scattered circle is in the level of very little, and the convergence degree of luminous energy is higher, it can be ensured that its accurately image.The doubly telecentric camera lens as shown in Figure 6
Optical distortion be much smaller than -0.006%, therefore the camera lens will provide high image restoring degree to industrial detection.It is double by Fig. 7
The illuminance of image plane curve map of telecentric lens can be seen that illumination of the illumination of the camera lens in whole field range almost without declining
Subtract, Illumination Distribution is uniform, and good illumination environment is provided for detected material.
The object, technical solutions and advantages of the present invention are further described by above-listed preferred embodiment, are answered
Understand, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (5)
1. the fixed times double telecentric optical system of one kind, it is characterised in that：Enter from left to right along light in the optical system of the camera lens
Penetrate direction be sequentially provided with preceding group, diaphragm C, rear group, it is described before group include the focal power that sets gradually for positive biconvex lens G-1,
Focal power is positive meniscus shaped lens G-2, focal power is negative biconcave lens G-3, focal power is positive meniscus shaped lens G-4；
The focal power that group includes setting gradually after described is negative meniscus shaped lens G-5, focal power is positive meniscus shaped lens G-6, light
Focal power is positive biconvex lens G-7, focal power is negative meniscus shaped lens G-8.
2. fixed times double telecentric optical system according to claim 1, it is characterised in that：It is described before group focal power for just, after
Group focal power is negative；Group focal power is negative biconcave lens G-3 before described and focal power is positive meniscus shaped lens G-4 composition glue
Charge-coupled, its total focal power is negative, mainly undertakes the effect of school spherical aberration and aberration；Group focal power is positive biconvex lens G- after described
7 and focal power form gluing unit for negative meniscus shaped lens G-8, its total focal power is just.
3. fixed times double telecentric optical system according to claim 2, it is characterised in that：The biconvex lens G-1 is to bent moon
Air spacing between shape lens G-2 is that the distance between 12.6mm, meniscus shaped lens G-2 to biconcave lens G-3 is 0.4mm,
The positive G-4 to diaphragm C for the glue pellet that biconcave lens G-3 and meniscus shaped lens G-4 is formed distance is 24.8mm, and diaphragm C is extremely
Meniscus shaped lens G-5 spacing is 0.1mm, and meniscus shaped lens G-5 to meniscus shaped lens G-6 distance is 15.5mm, falcate
The positive G-7 for the glue pellet that lens G-6 to biconvex lens G-7 and meniscus shaped lens G-8 is formed distance is 8.1mm.
4. fixed times double telecentric optical system according to claim 1, it is characterised in that：Group focal power is positive curved before described
Moon-shaped lens G-2 concave surfaces bend towards diaphragm, and preceding group of focal power is negative biconcave lens G-3 and focal power is positive meniscus shaped lens G-
The cemented surface of 4 composition gluing units bends towards diaphragm；Group focal power is that positive meniscus shaped lens G-6 concave surfaces bend towards diaphragm after described, after
Group focal power is positive biconvex lens G-7 and focal power is that negative meniscus shaped lens G-8 forms the cemented surface of gluing unit and bends towards light
Door screen.
5. fixed times double telecentric optical system according to claim 1, it is characterised in that：Preceding group to rear group of the camera lens away from
From for 24.9mm, the ratio between preceding group of focal power and rear group focal power are 2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711302506.8A CN107884912B (en) | 2017-12-11 | 2017-12-11 | Fixed-magnification double-telecentric optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711302506.8A CN107884912B (en) | 2017-12-11 | 2017-12-11 | Fixed-magnification double-telecentric optical system |
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| Publication Number | Publication Date |
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| CN107884912A true CN107884912A (en) | 2018-04-06 |
| CN107884912B CN107884912B (en) | 2020-04-21 |
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| CN201711302506.8A Active CN107884912B (en) | 2017-12-11 | 2017-12-11 | Fixed-magnification double-telecentric optical system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107557A (en) * | 2018-01-10 | 2018-06-01 | 佛山华国光学器材有限公司 | A kind of high magnification bilateral telecentric lens of long reach |
| CN109164558A (en) * | 2018-10-11 | 2019-01-08 | 佛山科学技术学院 | A kind of miniaturization image bilateral telecentric optical system |
| CN109188660A (en) * | 2018-10-11 | 2019-01-11 | 佛山科学技术学院 | A kind of miniaturization object space telecentric optical system |
| CN109254388A (en) * | 2018-11-21 | 2019-01-22 | 福建福光股份有限公司 | Telecentric optics are examined as system and imaging method |
| CN110895366A (en) * | 2019-11-22 | 2020-03-20 | 福建福光天瞳光学有限公司 | 0.5-time 110mm object distance high-resolution industrial double telecentric lens |
| CN110895367A (en) * | 2019-11-22 | 2020-03-20 | 福建福光天瞳光学有限公司 | 1.0-time 110mm object distance high-resolution industrial double telecentric lens |
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| JPH10206729A (en) * | 1997-01-24 | 1998-08-07 | Mamiya Op Co Ltd | Telephoto lens |
| CN105301744A (en) * | 2015-11-24 | 2016-02-03 | 福建福光股份有限公司 | Telephoto type super-large image plane high definition lens and installation method thereof |
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- 2017-12-11 CN CN201711302506.8A patent/CN107884912B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10206729A (en) * | 1997-01-24 | 1998-08-07 | Mamiya Op Co Ltd | Telephoto lens |
| CN105301744A (en) * | 2015-11-24 | 2016-02-03 | 福建福光股份有限公司 | Telephoto type super-large image plane high definition lens and installation method thereof |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107557A (en) * | 2018-01-10 | 2018-06-01 | 佛山华国光学器材有限公司 | A kind of high magnification bilateral telecentric lens of long reach |
| CN108107557B (en) * | 2018-01-10 | 2024-01-16 | 佛山华国光学器材有限公司 | High-magnification double-side telecentric lens with long working distance |
| CN109164558A (en) * | 2018-10-11 | 2019-01-08 | 佛山科学技术学院 | A kind of miniaturization image bilateral telecentric optical system |
| CN109188660A (en) * | 2018-10-11 | 2019-01-11 | 佛山科学技术学院 | A kind of miniaturization object space telecentric optical system |
| CN109164558B (en) * | 2018-10-11 | 2023-11-28 | 佛山科学技术学院 | Miniaturized object image bilateral telecentric optical system |
| CN109188660B (en) * | 2018-10-11 | 2023-11-28 | 佛山科学技术学院 | Miniaturized object space telecentric optical system |
| CN109254388A (en) * | 2018-11-21 | 2019-01-22 | 福建福光股份有限公司 | Telecentric optics are examined as system and imaging method |
| CN109254388B (en) * | 2018-11-21 | 2023-09-19 | 福建福光股份有限公司 | Telecentric optical imaging system and imaging method |
| CN110895366A (en) * | 2019-11-22 | 2020-03-20 | 福建福光天瞳光学有限公司 | 0.5-time 110mm object distance high-resolution industrial double telecentric lens |
| CN110895367A (en) * | 2019-11-22 | 2020-03-20 | 福建福光天瞳光学有限公司 | 1.0-time 110mm object distance high-resolution industrial double telecentric lens |
| CN110895367B (en) * | 2019-11-22 | 2024-03-05 | 福建福光天瞳光学有限公司 | 1.0 times 110mm object distance high-resolution industrial double telecentric lens |
| CN110895366B (en) * | 2019-11-22 | 2024-06-07 | 福建福光天瞳光学有限公司 | 0.5-Time 110mm object distance high-resolution industrial double telecentric lens |
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