CN107203051B - A kind of optical system of fixed-focus parallel light tube - Google Patents
A kind of optical system of fixed-focus parallel light tube Download PDFInfo
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- CN107203051B CN107203051B CN201710565738.6A CN201710565738A CN107203051B CN 107203051 B CN107203051 B CN 107203051B CN 201710565738 A CN201710565738 A CN 201710565738A CN 107203051 B CN107203051 B CN 107203051B
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Abstract
The invention discloses a kind of optical systems of fixed-focus parallel light tube, including being respectively positive power lens, negative-power lenses, negative-power lenses, positive power lens, the first, second, third, fourth of negative-power lenses, the 5th lens.The beam exit face of the beam incident surface of second lens and the first lens, the beam exit face of the beam incident surface of the third lens and the second lens, the beam exit face of the beam incident surface of the 4th lens and the third lens, the beam incident surface of the 5th lens and the 4th lens beam exit face there is the first spacing, the second spacing, third spacing and the 4th spacing along central optical axis respectively.The middle position of optical system is arranged in the third lens.Third spacing is greater than the first spacing, and the first spacing is greater than the second spacing, and the second spacing is greater than the 4th spacing.For resolution ratio of the present invention close to diffraction limit, systematic error is small, and measuring accuracy is high.
Description
Technical field
The invention belongs to technical field of optical, are related to a kind of optical system of fixed-focus parallel light tube.
Background technique
Important instrument of the parallel light tube as optical detection, application are very extensive.It is obtained by parallel light tube from unlimited
Remote light beam, this light beam are referred to as directional light.The bright graticle of illumination that light source issues, when graticle is located on the focal plane of object lens,
The picture of graticle in the infinite point of object lens image space, i.e., is directional light by the light that parallel light tube issues.Parallel light tube is adjustment
Important component in the important tool and optical metrology instrument of optical instrument, such as the China that notification number is CN2639880Y
Optical elements of large caliber disclosed in utility model patent damages on-line measuring device, is connect by an illumination parallel light tube and one
Receive parallel light tube cooperation eyepiece or microscopic system, then can measure the focal length of lens group, resolution and other at image quality
Amount.
Existing parallel light tube by its can zoom can be divided into fixed-focus parallel light tube and zoom parallel light tube, as notification number is
Illumination parallel light tube is a kind of fixed-focus parallel light tube disclosed in the Chinese utility model patent of CN2639880Y, is received parallel
Light pipe is a kind of zoom parallel light tube.And can then be divided into transmission-type and refraction-reflection parallel light tube by structure type, also
It is to say, parallel light tube usually contains the lens or folding, reflecting mirror of two panels or three pieces.Illumination parallel light tube is mostly fixed-focus at present
Parallel light tube, and its light source usually takes the form of point light source, the usual very little of the field angle that can accomplish, matched graticle
Very little, is only satisfied with the test put on axis, is not able to satisfy parallel light tube and uses in matching large scale graticle test.And simulate nothing
When poor long-range size objectives imaging, the image quality of parallel light tube is directly related to the readability of infinity target, influences to survey
Try precision.
Summary of the invention
(1) goal of the invention
The purpose of the present invention is: it is small for existing fixed-focus parallel light tube visual field, be difficult to meet the defect of testing requirement, it provides
A kind of resolution ratio is close to diffraction limit, it is ensured that the infinity target that graticle is formed after parallel light tube at be still it is clear, it is real
Show the high-resolution of parallel light tube to ensure the optical system of the fixed-focus parallel light tube of optic test precision.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of optical system of fixed-focus parallel light tube, the optical systems
System has an a central optical axis A1 and middle position V1；Optical system includes on central optical axis A1 and suitable along central optical axis
The first lens 1, the second lens 2, the third lens 3, the 4th lens 4 and the 5th lens 5 of secondary setting；First lens 1 are positive light focus
Lens are spent, there is the first beam incident surface 11 and the first beam exit face 12；Second lens 2 are negative-power lenses, have the
Two beam incident surfaces 21 and the second beam exit face 22, along center between the second beam incident surface 21 and the first beam exit face 12
Optical axis A1 has one first spacing；The third lens 3 are negative-power lenses, and there is third beam incident surface 31 and third light beam to go out
Face 32 is penetrated, there is one second spacing along central optical axis A1 between third beam incident surface 31 and the second beam exit face 22；4th
Lens 4 are positive power lens, have the 4th beam incident surface 41 and the 4th beam exit face 42, the 4th beam incident surface 41 with
There is a third spacing along central optical axis A1 between third beam exit face 32；5th lens 5 are negative-power lenses, have the
Five beam incident surfaces 51 and the 5th beam exit face 52, along center between the 5th beam incident surface 51 and the 4th beam exit face 42
Optical axis A1 has one the 4th spacing, has one the along central optical axis between the 5th beam exit face 52 and the first beam incident surface 11
Five spacing；Wherein, the third lens 3 are arranged in middle position V1；Third spacing is greater than the first spacing, and the first spacing is greater than between second
Away from the second spacing is greater than the 4th spacing；5th spacing is total less than preset optical system plus the distance of the first lens 1 to focal plane
Length.
Wherein, diaphragm 6 is provided between the third lens 3 and the 4th lens 4.
Wherein, the diaphragm 6 is fitted in the third lens 3, bonding position are as follows: close 4th lens 4 of the third lens 3
Fitting setting diaphragm 6 on side.
Wherein, the third lens 3 are cemented doublet, are formed by biconvex lens 301 and 302 gluing of biconcave lens, light
Door screen 6 fits with biconcave lens 302.
Wherein, the biconvex lens 301 have close to the second lens 2 setting the first convex surface 3011 and with the first convex surface
3011 the second convex surfaces 3012 being oppositely arranged, first convex surface 3011 are third beam incident surface 31, and biconcave lens 302 has
Close to the first concave surface 3021 that diaphragm 6 is arranged and the second concave surface 3022 for being oppositely arranged with the first concave surface 3021, this is first recessed
Face 3021 is third beam exit face 32, and the second convex surface 3012 fits with the second concave surface 3022.
Wherein, the biconvex lens 301 is respectively adopted different materials from biconcave lens 302 and is made, and the second lens 2
Refractive index is less than the refractive index of biconvex lens 301 and is less than the refractive index of biconcave lens 302.
Wherein, first lens 1, the second lens 2, the 4th lens 4 and the 5th lens 5 are all meniscus shaped lens.
Wherein, the refractive index of first lens 1, the 4th lens 4 and the 5th lens 5 is greater than the refraction of biconcave lens 302
Rate, the refractive index of biconcave lens 302 are greater than the refractive index of biconvex lens 301, and the refractive index of biconvex lens 301 is greater than the second lens
2 refractive index.
Wherein, the radius of curvature of first beam incident surface 11 is 175.68mm, the curvature of the first beam exit face 12
Radius is 544.35mm；The radius of curvature of second beam incident surface 21 is 151.91mm, the curvature half of the second beam exit face 22
Diameter is 68.92mm；The radius of curvature of third beam incident surface 31 is 93.67mm, and the radius of curvature of third beam exit face 32 is
96.62mm；The radius of curvature of 4th beam incident surface 41 is -234.63mm, the radius of curvature of the 4th beam exit face 42 is -
94.95mm；The radius of curvature of 5th beam incident surface 51 is -116.62mm, the radius of curvature of the 5th beam exit face 52 is -
190.01mm。
Wherein, first lens 1 select H-ZF62 optical glass, and the second lens 2 select H-QF6A optical glass, biconvex
Lens 301 select H-LAK53A optical glass, and biconcave lens 302 selects H-ZF52A optical glass, and the 4th lens 4 select H-
ZF62 optical glass, the 5th lens 5 select H-ZF62 optical glass.
(3) beneficial effect
The optical system of fixed-focus parallel light tube provided by above-mentioned technical proposal passes through five lens forming transmission imaging sides
Formula, and five lens strength distribution, using positive-negative-Negative-Positive-Negative and after combining the setting of reasonable spacing, field angle can reach
18 degree, it is ensured that while parallel light emergence, for optical transfer function close to diffraction limit, systematic error is small, and measuring accuracy is high.More,
Optical system total length is less than 600mm, and more convenient in practical applications, the scope of application of parallel light tube is wider, and compact-sized,
Small in size, easy to carry or carrying, use are very light.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the optical system of the fixed-focus parallel light tube of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the third lens in Fig. 1；
Fig. 3 is the optical transfer function performance plot of the optical system in Fig. 1；
Fig. 4 is the structural schematic diagram of the optical system of the fixed-focus parallel light tube of another embodiment of the present invention.
Wherein, the 1-the first lens；11-the first beam incident surface；12-the first beam exit face；2-the second lens；
21-the first beam incident surface；22-the second beam exit face；3-the third lens；31-third beam incident surfaces；32-thirds
Beam exit face；301-biconvex lens；3011-the first convex surface；3012-the second convex surface；302-biconcave lens；3021-the
One concave surface；3022-the second concave surface；4-the four lens；41-the four beam incident surface；42-the four beam exit face；5-the
Five lens；51-the five beam incident surface；52-the five beam exit face；6-diaphragms；A1-central optical axis；V1-interposition
It sets.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention
Specific embodiment is described in further detail.
Optical system of the invention is the optical system in fixed-focus parallel light tube, has fixed focal length, and focal length is
500mm, and entrance pupil bore is 60mm.
Refering to fig. 1, as shown, the optical system of fixed-focus parallel light tube of the invention has in a central optical axis A1 and one
Between position V1.Optical system includes upper positioned at central optical axis A1 and the first lens 1, second for being sequentially arranged along central optical axis are saturating
Mirror 2, the third lens 3, the 4th lens 4 and the 5th lens 5.First lens 1 are positive power lens, have the first beam incident surface
11 and first beam exit face 12.Second lens 2 are negative-power lenses, and there is the second beam incident surface 21 and the second light beam to go out
Face 22 is penetrated, there is one first spacing along central optical axis A1 between the second beam incident surface 21 and the first beam exit face 12.Third
Lens 3 be negative-power lenses, have third beam incident surface 31 and third beam exit face 32, third beam incident surface 31 with
There is one second spacing along central optical axis A1 between second beam exit face 22.4th lens 4 are positive power lens, have the
Four beam incident surfaces 41 and the 4th beam exit face 42, along center between the 4th beam incident surface 41 and third beam exit face 32
Optical axis A1 has a third spacing.5th lens 5 are negative-power lenses, and there is the 5th beam incident surface 51 and the 5th light beam to go out
Penetrate face 52, between the 5th beam incident surface 51 and the 4th beam exit face 42 along central optical axis A1 have one the 4th spacing, the 5th
There is one the 5th spacing along central optical axis between beam exit face 52 and the first beam incident surface 11.Wherein, the third lens 3 are arranged
In middle position V1；Third spacing is greater than the first spacing, and the first spacing is greater than the second spacing, and the second spacing is greater than the 4th spacing.
In addition, the 5th spacing is less than 600mm plus the distance of the first lens 1 to focal plane (graticle), that is to say, that optical system overall length
Degree is less than 600mm.
Preferably, be provided with a diaphragm 6 between the third lens 3 and the 4th lens 4, with limit peripheral field illumination it is big
Amplitude decline, solves the problems, such as that uneven illumination is even.The specific setting position of diaphragm 6 can be the third lens 3 and the 4th lens 4 it
Between any position (as shown in Figure 4).
As preferred embodiment, diaphragm 6 is also possible to be fitted in the third lens 3 (as shown in Figure 1).Specific fitting
Position are as follows: the fitting setting diaphragm 6 on the side of the 4th lens 4 of the third lens 3.
In conjunction with referring to Fig.2, the third lens 3 can be cemented doublet, by a biconvex lens 301 and a biconcave lens 302
Gluing forms, and diaphragm 6 fits with biconcave lens 302.Biconvex lens 301 is convex with one first be arranged close to the second lens 2
Face 3011 and one second convex surface 3012 being oppositely arranged with the first convex surface 3011, first convex surface 3011 are that third light beam enters
Face 31 is penetrated, biconcave lens 302 has one to set relatively close to one first concave surface 3021 that diaphragm 6 is arranged and with the first concave surface 3021
One second concave surface 3022 set, first concave surface 3021 are third beam exit face 32, the second convex surface 3012 and the second concave surface
3022 fit.Biconvex lens 301 is respectively adopted different materials from biconcave lens 302 and is made, and the refractive index of the second lens 2
Refractive index less than biconvex lens 301 and the refractive index less than biconcave lens 302.
In the present invention, the first lens 1, the second lens 2, the 4th lens 4 and the 5th lens 5 are all meniscus shaped lens.In order to
System is avoided to generate senior aberration, while the radius of curvature for controlling lens is not too large, the first lens 1, the 4th lens 4 and the 5th
Lens 5 all select the material of high-refractivity and low-dispersion coefficient, and preferably, the first lens 1, the 4th lens 4 and the 5th lens 5 can
It is made of identical material.More, in order to ensure parallel light emergence, the refractive index of the first lens 1 is more preferably greater than the second lens 2
Refractive index, and the refractive index of optical system of the invention preferably meets following relationship: the first lens 1, the 4th lens 4 and the 5th are saturating
The refractive index of mirror 5 is greater than the refractive index of biconcave lens 302, and the refractive index of biconcave lens 302 is greater than the refraction of biconvex lens 301
Rate, the refractive index of biconvex lens 301 are greater than the refractive index of the second lens 2.It should be noted that the first lens 1, the 4th lens 4
Optical property is best when with the 5th lens 5 using same material, but in actual use, and the 5th lens 5 can also be using with the
The material of one lens 1, other high-refractivity and low-dispersion coefficients of the 4th lens 4 relatively, after optimizing structure, performance can also be with
It meets the requirements.
Following table 1 lists the design parameter on each surface of optical system of a preferred embodiment of the present invention, " sequence in table
Number " it is to be arranged since light incidence end, the beam incident surface of the first lens 1 is serial number 1, and beam exit face is serial number 2, other
Mirror surface serial number and so on；" radius of curvature " provides spherical radius corresponding to each corrugated respectively, if in the curvature on vertex
The heart is located at the vertex left side, then radius of curvature is negative, otherwise is positive, if some surface vertices region is plane, by its curvature
Radius is denoted as " ∞ "；" spacing " goes out the centre distance between two neighboring surface along optical axis, if two surfaces belong to same
Eyeglass, then spacing indicates the thickness of the eyeglass.The design parameter of optical system is as follows:
The structural parameters of the optical system of the invention of table 1
| Serial number | Radius of curvature (mm) | Spacing (mm) | Optical glass |
| Object space | ∞ | 361.60 | |
| 1 | 175.68 | 15.66 | H-ZF62 |
| 2 | 544.35 | 62.07 | |
| 3 | 151.91 | 6.0 | H-QF6A |
| 4 | 68.92 | 33.51 | |
| 5 | 93.67 | 9.75 | H-LAK53A |
| 6 | -103.83 | 6.0 | H-ZF52A |
| 7 | 96.62 | 2.87 | |
| Diaphragm | ∞ | 77.1 | |
| 9 | -234.63 | 12.99 | H-ZF62 |
| 10 | -94.95 | 3.39 | |
| 11 | -116.62 | 9.0 | H-ZF62 |
| 12 | -190.01 | ∞ | |
| Image space | ∞ |
Following table 2 gives the optical glass parameter of optical system
The parameter of 2 optical glass of table
| Optical glass | Refractive index nd | Abbe number ν d | Relative partial dispersion Δ Pg.F |
| H-ZF62 | 1.92286 | 20.88 | 0.0298 |
| H-QF6A | 1.53172 | 48.84 | 0.0041 |
| H-LAK53A | 1.75500 | 52.32 | 0.0088 |
| H-ZF52A | 1.84666 | 23.78 | 0.0151 |
In practical applications, the design parameter of above each lens, such as radius of curvature, lens thickness, lens separation etc. can be done
Certain subtle adjustment is to meet different system parameter requirements.
Experiment proves that five lens strength distribution are using positive-negative-Negative-Positive-Negative and reasonable spacing is combined to be arranged
Afterwards, field angle can reach 18 degree.And combine the optical transfer function that can be seen that optical system of the invention refering to Fig. 3 close
Diffraction limit, systematic error is small, and measuring accuracy is high.More, optical system total length is less than 600mm, more convenient in practical applications,
The scope of application of parallel light tube is wider, and compact-sized, small in size, and easy to carry or carrying, use are very light.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of optical system of fixed-focus parallel light tube, which is characterized in that the optical system have a central optical axis (A1) and
One middle position (V1)；Optical system includes the first lens being sequentially arranged on central optical axis (A1) and along central optical axis
(1), the second lens (2), the third lens (3), the 4th lens (4) and the 5th lens (5)；First lens (1) are that positive light coke is saturating
Mirror has the first beam incident surface (11) and the first beam exit face (12)；Second lens (2) are negative-power lenses, are had
Second beam incident surface (21) and the second beam exit face (22), the second beam incident surface (21) and the first beam exit face (12)
Between along central optical axis (A1) have one first spacing；The third lens (3) are negative-power lenses, have third beam incident surface
(31) and third beam exit face (32), along central optical axis between third beam incident surface (31) and the second beam exit face (22)
(A1) there is one second spacing；4th lens (4) are positive power lens, have the 4th beam incident surface (41) and the 4th light beam
Exit facet (42) has a third along central optical axis (A1) between the 4th beam incident surface (41) and third beam exit face (32)
Spacing；5th lens (5) are negative-power lenses, have the 5th beam incident surface (51) and the 5th beam exit face (52), the
There is one the 4th spacing, the 5th light beam along central optical axis (A1) between five beam incident surfaces (51) and the 4th beam exit face (42)
There is one the 5th spacing along central optical axis between exit facet (52) and the first beam incident surface (11)；Wherein, the third lens (3) are set
It sets at middle position (V1)；Third spacing is greater than the first spacing, and the first spacing is greater than the second spacing, and the second spacing is greater than between the 4th
Away from；5th spacing is less than preset optical system total length plus the distance of the first lens (1) to focal plane；
Diaphragm 6 is provided between the third lens (3) and the 4th lens (4))；
The diaphragm (6) is fitted on the third lens (3), bonding position are as follows: close 4th lens (4) of the third lens (3)
Fitting setting diaphragm (6) on side；
The third lens (3) are cemented doublet, are formed by biconvex lens (301) and biconcave lens (302) gluing, diaphragm
(6) it fits with biconcave lens (302)；
The biconvex lens (301) have close to the second lens (2) setting the first convex surface (3011) and with the first convex surface
(3011) the second convex surface (3012) being oppositely arranged, which is third beam incident surface (31), and concave-concave is saturating
Mirror (302) has the first concave surface (3021) being arranged close to diaphragm (6) and be oppositely arranged with the first concave surface (3021) second
Concave surface (3022), first concave surface (3021) are third beam exit face (32), the second convex surface (3012) and the second concave surface
(3022) it fits；
The refractive index of first lens (1), the 4th lens (4) and the 5th lens (5) is greater than the refraction of biconcave lens (302)
Rate, the refractive index of biconcave lens (302) are greater than the refractive index of biconvex lens (301), and the refractive index of biconvex lens (301) is greater than the
The refractive index of two lens (2)；
The radius of curvature of first beam incident surface (11) is 175.68mm, and the radius of curvature of the first beam exit face (12) is
544.35mm；The radius of curvature of second beam incident surface (21) is 151.91mm, the radius of curvature of the second beam exit face (22)
For 68.92mm；The radius of curvature of third beam incident surface (31) is 93.67mm, the radius of curvature of third beam exit face (32)
For 96.62mm；The radius of curvature of 4th beam incident surface (41) is -234.63mm, the curvature half of the 4th beam exit face (42)
Diameter is -94.95mm；The radius of curvature of 5th beam incident surface (51) is -116.62mm, the curvature of the 5th beam exit face (52)
Radius is -190.01mm.
2. the optical system of fixed-focus parallel light tube as described in claim 1, which is characterized in that the biconvex lens (301) with
Biconcave lens (302) is respectively adopted different materials and is made, and the refractive index of the second lens (2) is less than biconvex lens (301)
Refractive index and the refractive index for being less than biconcave lens (302).
3. the optical system of fixed-focus parallel light tube as described in claim 1, which is characterized in that first lens (1), second
Lens (2), the 4th lens (4) and the 5th lens (5) are all meniscus shaped lens.
4. the optical system of fixed-focus parallel light tube as described in claim 1, which is characterized in that first lens (1) are selected
H-ZF62 optical glass, the second lens (2) select H-QF6A optical glass, and biconvex lens (301) selects H-LAK53A optics glass
Glass, biconcave lens (302) select H-ZF52A optical glass, and the 4th lens (4) select H-ZF62 optical glass, the 5th lens (5)
Select H-ZF62 optical glass.
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| CN201710565738.6A CN107203051B (en) | 2017-07-12 | 2017-07-12 | A kind of optical system of fixed-focus parallel light tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710565738.6A CN107203051B (en) | 2017-07-12 | 2017-07-12 | A kind of optical system of fixed-focus parallel light tube |
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| CN107203051B true CN107203051B (en) | 2019-08-16 |
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| CN107763450B (en) * | 2017-11-21 | 2024-01-16 | 广州达森灯光股份有限公司 | Optical system for LED stage lamp |
| KR20200015049A (en) * | 2018-08-02 | 2020-02-12 | (주)제이티 | Slit light source and vision inspection apparatus having the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD294574A5 (en) * | 1990-04-12 | 1991-10-02 | Carl Zeiss Jena Gmbh,De | APOCHROMATIC FIELD LENS COLLIMATOR |
| CN2387553Y (en) * | 1999-07-23 | 2000-07-12 | 中国科学院上海光学精密机械研究所 | Laser telescope for high power semiconductor laser |
| CN2560966Y (en) * | 2002-03-18 | 2003-07-16 | 西安众为科技发展有限公司 | Combined optical collimating apparatus |
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