CN208569170U - Telecentric lens - Google Patents
Telecentric lens Download PDFInfo
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- CN208569170U CN208569170U CN201821042558.6U CN201821042558U CN208569170U CN 208569170 U CN208569170 U CN 208569170U CN 201821042558 U CN201821042558 U CN 201821042558U CN 208569170 U CN208569170 U CN 208569170U
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- eyeglass group
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- positive light
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Abstract
A kind of telecentric lens successively include: the first eyeglass group with positive light coke, the second eyeglass group with negative power, the third eyeglass group with negative power, the 4th eyeglass group with positive light coke, the 5th eyeglass group with negative power, prism of turning back, diaphragm, the 6th eyeglass group, the 7th eyeglass group with negative power and the 8th eyeglass group with positive light coke with positive light coke from the object side to image side.The utility model can be realized the blur-free imaging of 12,000,000 pixels and without obvious purple boundary and dispersion, and image quality clearly becomes clear；By the mobile combination of different lens sets, the magnification change of camera lens is realized；Meet object space, image space doubly telecentric simultaneously, and object space telecentricity and image space telecentricity can achieve the standard of general telecentric lens and have high telecentricity level；By special prism arrangement of turning back, the case where coaxial light source forms bright spot of view-field center can significantly improve, light source is avoided to generate imaging problem brought by halation.
Description
Technical field
The utility model relates to a kind of technology in optical device field, specifically a kind of telecentric lens.
Background technique
Telecentric lens are mainly to correct the parallax of traditional industry camera lens and design, it can be in certain object distance range
Interior, the image enlargement ratio made is constant, this is to the very important application of situation of the measured object not on same object plane.It is existing
Have in technology, the characteristics of telecentric lens are broadly divided into object space telecentricity and image space telecentricity, object space telecentric beam path is that object space chief ray is flat
Row is located at object space infinity in the convergence center of optical axis chief ray, can eliminate object space since inaccurate bring reading of focusing misses
Difference；The characteristics of telecentric beam path in image space is that image space chief ray is parallel to the convergence center of optical axis chief ray and is located at image space infinity, can
To eliminate the inaccurate measurement error introduced of image space focusing.Doubly telecentric camera lens, which then refers to, not only to have been met object space telecentric beam path feature but also had met
The imaging system of telecentric beam path in image space feature, it contains two kinds of common advantages of telecentric beam path, therefore design difficulty is bigger, this
Class camera lens is often fixed enlargement ratio camera lens, and object space, the telecentricity of image space can not meet high level simultaneously, and tradition is remote
The prism design of heart camera lens causes light source that can form speck in image plane center, disturbs the image quality of camera lens.
Utility model content
The utility model In view of the above shortcomings of the prior art, proposes a kind of telecentric lens, have both object space telecentricity and
The advantages of image space telecentricity, while having the advantages that telecentricity height, variable magnification, 12,000,000 ultrahigh resolutions, non-stop layer speck.
The utility model is achieved through the following technical solutions:
The utility model successively includes: the first eyeglass group with positive light coke, has negative power from the object side to image side
The second eyeglass group, the third eyeglass group with negative power, the 4th eyeglass group with positive light coke, with negative power
5th eyeglass group, prism of turning back, diaphragm, the 6th eyeglass group with positive light coke, the 7th eyeglass group with negative power and
The 8th eyeglass group with positive light coke.
The first eyeglass group, comprising: one piece of lens and one piece of gluing with negative power with positive light coke
Eyeglass, in which: towards object space, the refractive index of front lens is (1.65,2) for cemented surface concave surface, and Abbe number is (45,70), after
The refractive index of lens be (1.75,1.9), Abbe number be (25,40), the product of the focal length of the focal length and rear lens of front lens with
The ratio between whole focal length of cemented doublet is (37,40).
The second eyeglass group, comprising: one piece of lens and one piece of lens with negative power with positive light coke.
The third eyeglass group includes: one piece of cemented doublet with negative power, and the cemented surface of the cemented doublet is recessed
Facing towards image space, the refractive index of front lens is (1.75,1.95), and Abbe number is (35,40), and the refractive index of rear lens is
(1.45,1.6), Abbe number are (65,95), the diameter of the front surface of cemented doublet and the ratio of radius of curvature and rear surface
The difference of diameter and the ratio of radius of curvature is (0.01,0.03).
The 4th eyeglass group, comprising: one piece of cemented doublet with positive light coke and one piece are with positive light coke
Lens, the concave surface of the cemented surface of the cemented doublet is towards image space.
The 5th eyeglass group, comprising: one piece of lens and one piece of lens with positive light coke with negative power.
The 6th eyeglass group includes: one piece of cemented doublet with positive light coke.
The 7th eyeglass group includes: at least one piece lens with negative power, the preferred non-spherical lens of the lens
To further decrease the coma of camera lens.
The 8th eyeglass group, comprising: two pieces of lens with positive light coke.
The focal length of the first eyeglass group and the focal length of the second eyeglass group respectively with the ratio between the focal length of the 4th eyeglass group
Absolute value is (2.60,2.75), (1.35,1.55)；The focal length of the 7th eyeglass group and the ratio between the focal length of the 8th eyeglass group
Absolute value be (0.6,0.73).
The prism of turning back includes three triangular prisms, in which: the setting of the first and second triangular prism face gluings, the
Three and first triangular prism back to gluing be arranged.
The angle of telecentric lens described in the utility model, the chief ray and optical axis that are incident on first piece of lens front surface is small
In 0.01, the angle of chief ray and optical axis that last piece of lens rear surface is emitted is less than 0.01.
Technical effect
Compared with prior art, the utility model can reach the imaging capability of 12,000,000 pixels, can blur-free imaging, and nothing
Obvious purple boundary and dispersion, image quality clearly become clear；By the mobile combination of different lens sets, the magnifying power for realizing camera lens becomes
Change；Meet object space, image space doubly telecentric simultaneously, and object space telecentricity and image space telecentricity can achieve the mark of general telecentric lens
Standard simultaneously has high telecentricity level；By special prism arrangement of turning back, it can significantly improve coaxial light source and form center
The case where speck, avoids light source from generating imaging problem brought by halation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment；
Fig. 2 is illumination path contrast schematic diagram；
In figure: A is the index path of the utility model；B is the index path using common prism；
Fig. 3 is distortion figure of the embodiment 1 in 0.36 times of enlargement ratio；
Fig. 4 is distortion figure of the embodiment 1 in 0.55 times of enlargement ratio；
Fig. 5 is MTF figure of the embodiment 1 in 0.36 times of enlargement ratio；
Fig. 6 is MTF figure of the embodiment 1 in 0.55 times of enlargement ratio；
Fig. 7 is light source real scene shooting contrast test figure；
In figure: A is the light source real scene shooting test chart of the present embodiment 1；B is to be tested using the light source real scene shooting for prism of commonly turning back
Figure；
Fig. 8 is distortion figure of the embodiment 2 in 0.28 times of enlargement ratio；
Fig. 9 is distortion figure of the embodiment 2 in 0.45 times of enlargement ratio；
Figure 10 is MTF figure of the embodiment 2 in 0.28 times of enlargement ratio；
Figure 11 is MTF figure of the embodiment 2 in 0.45 times of enlargement ratio；
In figure: the first eyeglass group G1, the second eyeglass group G2, third eyeglass group G3, the 4th eyeglass group G4, the 5th eyeglass group
G5, the prism LL that turns back, triangular prism LL1~LL3, diaphragm STP, the 6th eyeglass group G6, the 7th eyeglass group G7, the 8th eyeglass group
G8, the first lens L1, the second cemented doublet L2, the third lens L3, the 4th lens L4, the 6th cemented doublet L6, the 7th lens L7,
8th lens L8, the 9th lens L9, the tenth cemented doublet L10, the 11st lens L11, the 12nd lens L12, the 13rd lens
L13, the first front lens L21, the first rear lens L22, the second front lens L51, the second rear lens L52, image planes IMG.
Specific embodiment
As shown in Figure 1, the present embodiment successively includes: the first eyeglass group G1, tool with positive light coke from the object side to image side
There are the second eyeglass group G2 of negative power, third eyeglass group G3, the 4th eyeglass group with positive light coke with negative power
G4, the 5th eyeglass group G5 with negative power, the prism LL that turns back, diaphragm STP, the 6th eyeglass group G6 with positive light coke,
The 7th eyeglass group G7 with negative power and the 8th eyeglass group G8 with positive light coke.
The first eyeglass group G1, comprising: the first lens L1 with positive light coke and second with negative power
Cemented doublet L2, in which: cemented surface concave surface is towards object space.
The second cemented doublet L2, comprising: the first front lens L21 and the first rear lens L22.
The second eyeglass group G2, comprising: the third lens L3 with positive light coke and the with negative power the 4th
Lens L4.
The third eyeglass group G3 includes: one piece of the 5th cemented doublet L5 with negative power, comprising: before second thoroughly
Mirror L51 and the second rear lens L52, the cemented surface concave surface of the cemented doublet is towards image space.
The 4th eyeglass group G4, comprising: the 6th cemented doublet L6 with positive light coke and with positive light coke
7th lens L7, the concave surface of the cemented surface of the cemented doublet is towards image space.
The 5th eyeglass group G5, comprising: the 8th lens L8 with negative power and the with positive light coke the 9th
Lens L9.
The 6th eyeglass group G6 includes: one piece of cemented doublet L10 with positive light coke.
The 7th eyeglass group G7 is at least one piece the 11st lens L11 with negative power, preferably aspherical
Mirror is to reduce the coma of camera lens.
The 8th eyeglass group G8, comprising: the 12nd lens L12 with positive light coke and with positive light coke
13 lens L13.
The prism LL that turns back includes three triangular prism LL1~LL3, in which: the first and second triangular prism LL1,
The setting of LL2 face gluing, third and first triangular prism LL3, LL1 are arranged back to gluing.
The present embodiment enlargement ratio is (0.36X, 0.55X), and image distance is 549mm.
The lens construction parameter of 1 the present embodiment of table
Wherein the second surface of the first front lens L21 of the second cemented doublet L2 is the first surface of the first rear lens L22,
The second surface of second front lens L51 of the 5th cemented doublet is the first surface of the second rear lens L52, the 6th cemented doublet L6
Front lens second surface be rear lens first surface, the second surface of the front lens of the tenth cemented doublet L10 be it is rear thoroughly
The first surface of mirror.
2 the present embodiment camera lens asphericity coefficient of table
| Surface serial number | K | A4 | B6 | C8 | D10 |
| 28 | 2.76 | 2.01e-04 | -5.53e-06 | 7.41E-08 | 7.59E-11 |
| 29 | 3.45 | 3.64E-04 | 1.45E-05 | 6.23E-07 | -8.82E-12 |
3 the present embodiment of table is in the group mobility position of 0.36X-0.55X
| Mobile width | 0.36X | 0.55X |
| D1 | 220 | 247 |
| D2 | 43.73 | 43.63 |
| D3 | 60.12 | 8.65 |
| D4 | 4.55 | 5.54 |
| D5 | 4.38 | 10.91 |
| D6 | 1.48 | 13.37 |
| D7 | 30.42 | 29.68 |
| D8 | 17.62 | 18.08 |
| D9 | 40.7 | 46.14 |
When enlargement ratio changes from small times to big times, the total length of object plane to image planes is remained unchanged, the first eyeglass group G1
, second eyeglass group G2 first to object plane mobile after image image planes mobile, third eyeglass group G3 mobile to image planes mobile, the 4th mirror to object plane
Piece group G4 is first mobile to the mobile after image image planes of object plane, the first mobile, prism of turning back to the mobile after image image planes of object plane of the 5th eyeglass group G5
LL and diaphragm TP and the 6th eyeglass group G6 together to image planes mobile, the 7th eyeglass group G7 to object plane mobile, the 8th eyeglass group G8
Mobile to image planes, eight eyeglass group linkages are common to adjust multiplying power variation.
The focal length of the first eyeglass group of the present embodiment and the focal length of the second eyeglass group respectively with the focal length of the 4th eyeglass group it
The absolute value of ratio is 2.60,1.35.
The absolute value of the ratio between the focal length of the 7th eyeglass group of the present embodiment and the focal length of the 8th eyeglass group is 0.73.
The refractive index of the first front lens L21 of the second cemented doublet L2 of the present embodiment is 1.92, Abbe number 62.8, the
The refractive index of one rear lens L22 is 1.88, Abbe number 37.0, the coke of the focal length of the first front lens L21 and the first rear lens L22
Away from product and the ratio between the whole focal length of the second cemented doublet be 37.4.
The above numerical value constrains the material and focal length ratio of the second cemented doublet, and the lens materials of height Abbe number match focus
The ratio between away from, the chromatism of position of camera lens is effectively reduced.
The refractive index of second front lens L51 of the 5th cemented doublet of the present embodiment is 1.95, Abbe number 35.1, the
The refractive index of two rear lens L52 is 1.57, Abbe number 91.3, the diameter of the front surface of the 5th cemented doublet and the 5th gluing
The diameter of the rear surface of the ratio of the radius of curvature of lens front surface and the 5th cemented doublet and the 5th cemented doublet rear surface
The difference of the ratio of radius of curvature is 0.01.
The above numerical value constrains the face type and material of the 5th cemented doublet, the cemented doublet group material of height Abbe number combinations
The shape for cooperating meniscus shaped lens, reduces the spherical aberration and ratio chromatism, of camera lens.
As shown in Fig. 2, the specific prism LL that turns back of the present embodiment is formed by three triangular prism gluings, before being with object plane
Side, sphere shape light is irradiated into system above prism, and by semi-transparent semi-reflecting lens, the light of half passes through from back to front successively to be worn
The eyeglass group in front of prism is crossed, after being irradiated to object space, is imaged onto image planes using telecentric lens；The other half light is downward
By prism, the eyeglass group rental after four secondary reflections across prism rear becomes ghost.Because front-reflection 4 is imaged in ghost
Secondary, energy attenuation is the 1/32 of original light source energy, can be substantially reduced bright spot of view-field center intensity, mitigates ghost and halation.It compares
In the square prism that common two triangular prisms compose, sphere shape light is irradiated into system above prism, by semi-transparent
Semi-reflective mirror, the light of half passes through the eyeglass group sequentially passed through in front of prism from back to front, after being irradiated to object space, using remote
On heart lens imaging to image planes；The other half light passes downwardly through prism, and the eyeglass at prism rear is passed through after two secondary reflections
Group rental becomes ghost.Because only reflecting 2 times before ghost imaging, energy only decays to the 1/8 of original light source energy, bright spot of view-field center
Intensity is big, there is apparent ghost and halation.
As shown in Figure 3 and Figure 4, for the present embodiment under two enlargement ratios of 0.36X, 0.55X, optical distortion is much smaller than 1%.
It can guarantee that lens imaging is uniform under any multiplying power, increase the accuracy and measurability of imaging results, meet industrial lens
Demand.
As shown in Figure 5 and Figure 6, the present embodiment is still able to satisfy center to lower MTF greater than 50% in the line of 90lp/mm, week
Side is greater than 40%, cooperates the size sensor of 28mm super large target surface, and the present embodiment camera lens can achieve the imaging solution of 12,000,000 pixels
Analysis ability.
As shown in fig. 7, the present embodiment is when point light source is located at the position 1.5cm above prism, light source real scene shooting test center is bright
Spot situation can be still obviously improved.Illustrate that the present embodiment can be substantially reduced the feelings that coaxial light source is formed by bright spot of view-field center
Condition avoids imaging problem brought by the halation of light source generation.
Embodiment 2
As shown in Figure 1, the present embodiment is compared with Example 1, the present embodiment enlargement ratio is (0.28X, 0.45X), image
Distance is 545mm.
The lens construction parameter of 4 the present embodiment of table
Wherein the second surface of the first front lens L21 of the second cemented doublet L2 is the first surface of the first rear lens L22,
The second surface of second front lens L51 of the 5th cemented doublet is the first surface of the second rear lens L52, the 6th cemented doublet L6
Front lens second surface be rear lens first surface, the second surface of the front lens of the tenth cemented doublet L10 be it is rear thoroughly
The first surface of mirror.
5 the present embodiment camera lens asphericity coefficient of table
| Surface serial number | K | A4 | B6 | C8 | D10 |
| 20 | 0 | 6.10e-05 | -1.31e-07 | -4.66E-09 | 8.38E-11 |
| 21 | 0 | -3.86E-05 | 1.45E-07 | 5.17E-09 | -8.30E-12 |
6 the present embodiment of table is in the group mobility position of 0.28X-0.45X
| Mobile width | 0.28X | 0.46X |
| D1 | 220 | 244 |
| D2 | 43.77 | 47.31 |
| D3 | 59.36 | 11.16 |
| D4 | 4.11 | 6.58 |
| D5 | 3.48 | 10.66 |
| D6 | 0.48 | 12.84 |
| D7 | 29.96 | 28.50 |
| D8 | 17.55 | 17.68 |
| D9 | 44.56 | 44.55 |
The focal length of the first eyeglass group of the present embodiment and the focal length of the second eyeglass group respectively with the focal length of the 4th eyeglass group it
The absolute value of ratio is 2.74,1.53.
The absolute value of the ratio between the focal length of the 7th eyeglass group of the present embodiment and the focal length of the 8th eyeglass group is 0.6.
The refractive index of the first front lens L21 of the second cemented doublet L2 of the present embodiment is 1.69, Abbe number 49.1, the
The refractive index of one rear lens L22 is 1.75, Abbe number 27.6, the coke of the focal length of the first front lens L21 and the first rear lens L22
Away from product and the ratio between the whole focal length of the second cemented doublet be 38.9.
The above numerical value constrains the material and focal length ratio of the second cemented doublet, and the lens materials of height Abbe number match focus
The ratio between away from, the chromatism of position of camera lens is effectively reduced.
The refractive index of second front lens L51 of the 5th cemented doublet of the present embodiment is 1.75, Abbe number 27.5, the
The refractive index of two rear lens L52 is 1.49, Abbe number 69.4, the diameter of the front surface of the 5th cemented doublet and the 5th gluing
The diameter of the rear surface of the ratio of the radius of curvature of lens front surface and the 5th cemented doublet and the 5th cemented doublet rear surface
The difference of the ratio of radius of curvature is 0.03.
The above numerical value constrains the face type and material of the 5th cemented doublet, the cemented doublet group material of height Abbe number combinations
The shape for cooperating meniscus shaped lens, reduces the spherical aberration and ratio chromatism, of camera lens.
As shown in fig. 7, can significantly improve the case where coaxial light source forms bright spot of view-field center by prism arrangement of turning back, keeping away
Exempt from light source and generates imaging problem brought by halation.
As shown in Figure 8 and Figure 9, under two enlargement ratios of 0.28X and 0.45X, optical distortion is much smaller than the present embodiment
1%.It can guarantee that lens imaging is uniform under any multiplying power, increase the accuracy and measurability of imaging results, meet industrial mirror
The demand of head.
As shown in Figure 10 and Figure 11, the present embodiment is still able to satisfy center to lower MTF greater than 50% in the line of 90lp/mm,
Periphery is greater than 40%, cooperates the size sensor of 28mm super large target surface, and the present embodiment camera lens can achieve the imaging of 12,000,000 pixels
Analytic ability.
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 (12)
1. a kind of telecentric lens, which is characterized in that successively include: from the object side to image side the first eyeglass group with positive light coke,
The second eyeglass group with negative power, the third eyeglass group with negative power, the 4th eyeglass group with positive light coke, tool
The 5th eyeglass group for having negative power, prism of turning back, diaphragm, the 6th eyeglass group with positive light coke, with negative power
7th eyeglass group and the 8th eyeglass group with positive light coke；
The prism of turning back includes: three triangular prisms, in which: the setting of the first and second triangular prism face gluings, third
It is arranged with the first triangular prism back to gluing.
2. telecentric lens according to claim 1, characterized in that the first eyeglass group, comprising: one piece has positive light
The lens of focal power and one piece of cemented doublet with negative power.
3. telecentric lens according to claim 1, characterized in that the third eyeglass group, which includes: one piece, has negative light
The cemented doublet of focal power.
4. telecentric lens according to claim 1, characterized in that the second eyeglass group, comprising: one piece has positive light
The lens of focal power and one piece of lens with negative power.
5. telecentric lens according to claim 1, characterized in that the 4th eyeglass group, comprising: one piece has positive light
The cemented doublet of focal power and one piece of lens with positive light coke.
6. telecentric lens according to claim 1, characterized in that the 5th eyeglass group, comprising: one piece has negative light
The lens of focal power and one piece of lens with positive light coke.
7. telecentric lens according to claim 1, characterized in that the 6th eyeglass group, which includes: one piece, has positive light
The cemented doublet of focal power；The 8th eyeglass group, comprising: two pieces of lens with positive light coke.
8. telecentric lens according to claim 1, characterized in that the 7th eyeglass group, which includes: at least one piece, to be had
The non-spherical lens of negative power is to reduce the coma of camera lens.
9. telecentric lens according to claim 2, characterized in that the refractive index of the front lens of the cemented doublet is
(1.65,2), Abbe number are (45,70), and the refractive index of rear lens is (1.75,1.9), and Abbe number is (25,40), preceding
The ratio between product and the whole focal length of cemented doublet of the focal length of the focal length and rear lens of mirror are (37,40).
10. telecentric lens according to claim 3, characterized in that the refractive index of the front lens of the cemented doublet is
(1.75,1.95), Abbe number are (35,40), and the refractive index of rear lens is (1.45,1.6), and Abbe number is (65,95), should
After the ratio and the 5th cemented doublet of the radius of curvature of the diameter of the front surface of cemented doublet and the 5th cemented doublet front surface
The difference of the ratio of the radius of curvature of the diameter on surface and the 5th cemented doublet rear surface is (0.01,0.03).
11. any telecentric lens according to claim 1~10, characterized in that the focal length of the first eyeglass group
With the focal length of the second eyeglass group be with the absolute value of the ratio between the focal length of the 4th eyeglass group respectively (2.60,2.75), (1.35,
1.55)；The absolute value of the ratio between the focal length of the 7th eyeglass group and the focal length of the 8th eyeglass group is (0.6,0.73).
12. any telecentric lens according to claim 1~10, characterized in that it is incident on table before first piece of lens
Less than 0.01, the angle of chief ray and optical axis that last piece of lens rear surface is emitted is less than for the chief ray in face and the angle of optical axis
0.01。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821042558.6U CN208569170U (en) | 2018-07-03 | 2018-07-03 | Telecentric lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821042558.6U CN208569170U (en) | 2018-07-03 | 2018-07-03 | Telecentric lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114616A (en) * | 2021-11-01 | 2022-03-01 | 湖南长步道光学科技有限公司 | High-resolution ultralow-distortion optical system and lens |
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2018
- 2018-07-03 CN CN201821042558.6U patent/CN208569170U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114616A (en) * | 2021-11-01 | 2022-03-01 | 湖南长步道光学科技有限公司 | High-resolution ultralow-distortion optical system and lens |
| CN114114616B (en) * | 2021-11-01 | 2024-03-01 | 湖南长步道光学科技有限公司 | High-resolution ultralow-distortion optical system and lens |
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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. |
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