CN109164559A - A kind of large-numerical aperture near-infrared image bilateral telecentric optical system - Google Patents
A kind of large-numerical aperture near-infrared image bilateral telecentric optical system Download PDFInfo
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- CN109164559A CN109164559A CN201811184809.9A CN201811184809A CN109164559A CN 109164559 A CN109164559 A CN 109164559A CN 201811184809 A CN201811184809 A CN 201811184809A CN 109164559 A CN109164559 A CN 109164559A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 230000002146 bilateral effect Effects 0.000 title claims abstract description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 26
- 239000005308 flint glass Substances 0.000 claims description 11
- 239000005331 crown glasses (windows) Substances 0.000 claims description 6
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 5
- 239000000571 coke Substances 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 2
- 238000003384 imaging method Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000004075 alteration Effects 0.000 description 10
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- 230000008901 benefit Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
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- 201000009310 astigmatism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 230000004313 glare Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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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Abstract
Invention describes a kind of large-numerical aperture near-infrared image bilateral telecentric optical systems, including the first lens, the second lens, Amici prism, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens, diaphragm being arranged successively on as plane to the object plane direction of propagation in light.Wherein first lens use falcate positive power lens using biconvex positive power lens, the 8th lens using biconvex positive power lens, the 7th lens using concave-concave negative-power lenses, the 6th lens using biconvex positive power lens, the 5th lens using bent moon positive power lens, the 4th lens using concave-concave negative-power lenses, the third lens using biconvex positive power lens, second lens.Object-side numerical aperture of the present invention reaches 0.5, and detection light collecting light ability is strong；Resolution ratio reaches 0.85 μm, it can be achieved that high-resolution imaging；In addition the present invention is able to achieve image bilateral telecentricity and low distortion.
Description
Technical field
The present invention relates to optical field more particularly to a kind of large-numerical aperture near-infrared image bilateral telecentric optical systems.
Background technique
Current machine vision system has askiatic deformation using image bilateral telecentric optical system, ignores angle error, super
The advantages that wide depth of field, constant ultra-low distortion and imaging multiplying power, has apparent technical advantage compared to general industry camera lens, in essence
Close field of industry detection has been widely used.The image bilateral telecentric optic head of existing market is typically employed in visible light
Spectral coverage is detected, it is less in the telecentricity industrial lens type of near-infrared spectral coverage, and that there are resolution ratio is not high enough, detectivity is not strong enough
The defects of.
Summary of the invention
For deficiency existing for existing object space telecentric optical system, the present invention provides a kind of large-numerical aperture near-infrareds
Image bilateral telecentric optical system.
To achieve the above objectives, the present invention adopts the following technical scheme:
A kind of large-numerical aperture near-infrared image bilateral telecentric optical system is included in light along as plane to object plane passes
Broadcast the first lens being arranged successively on direction, the second lens, Amici prism, the third lens, the 4th lens, diaphragm, the 5th lens,
6th lens, the 7th lens, the 8th lens；
First lens, the second lens constitute front lens group, the third lens, the 4th lens, the 5th lens, the 6th
Lens, the 7th lens and the 8th lens constitute rear lens group；
The focal power of the front lens group is set as φ A, and the focal power of the rear lens group is set as φ C, the light of the system
Focal power is set as φ,
Then the ratio of φ A and φ meets following condition:
1.8≤φA/φ≤2.2；
Then the ratio of φ C and φ meets following condition:
9.1≤φC/φ≤10.5。
Further, the first lens front surface radius of curvature be 32.863mm, rear surface radius of curvature be-
55.462mm, center thickness 4.2mm, lens clear aperture are φ 16.8mm；The second lens front surface radius of curvature be-
24.588mm, rear surface radius of curvature are 14.602mm, and center thickness 2.5mm, lens clear aperture is φ 12.2mm；It is described
The third lens front surface radius of curvature be -468.981mm, rear surface radius of curvature be -52.485mm, center thickness 8.7mm,
Lens clear aperture is φ 52.3mm；The 4th lens front surface radius of curvature is 140.698mm, rear surface radius of curvature
For -162.111mm, center thickness 6.7mm, lens clear aperture is φ 50.2mm；The 5th lens front surface curvature half
Diameter is -66.202mm, and rear surface radius of curvature is 39.859mm, and center thickness 2.5mm, lens clear aperture is φ
48.2mm；The 6th lens front surface radius of curvature is 39.859mm, and rear surface radius of curvature is -185.774mm, and center is thick
Degree is 11.9mm, and lens clear aperture is φ 48.2mm；The 7th lens front surface radius of curvature is 50.225mm, rear surface
Radius of curvature is -578.471, center thickness 9.6mm, and lens clear aperture is φ 49.1mm；8th lens front surface
Radius of curvature is 23.513mm, and rear surface radius of curvature is 35.756mm, and center thickness 5.1mm, lens clear aperture is φ
29.2mm。
Further, the 5th lens and the 6th lens group are at cemented doublet.
Further, first lens use concave-concave negative power using biconvex positive power lens, second lens
Lens, the third lens are using bent moon positive power lens, the 4th lens using biconvex positive power lens, described the
Five lens are used using concave-concave negative-power lenses, the 6th lens using biconvex positive power lens, the 7th lens
Biconvex positive power lens, the 8th lens use falcate positive power lens.
Further, first lens are made of heavy-lanthanide flint glass material, second lens are using flint glass
Material is made, the third lens are made of dense crown material, the 4th lens are made of crown glass material, institute
State that the 5th lens are made of flint glass material, the 6th lens are made of billows crown glass material, the 7th lens
It is made of dense crown material, the 8th lens are made of heavy-lanthanide flint glass material.
The present invention has the beneficial effect that:
The present invention carries out industrial detection imaging using near-infrared spectral coverage, has anti-extraneous veiling glare ability compared to visible spectrum
By force, it is not easy the advantages of being disturbed；
The present invention realizes large-numerical aperture detection imaging, solves current CCD or CMOS camera and visits in near-infrared spectral coverage
The problem of surveying scarce capacity, help to obtain the testee image information of high contrast；
Resolution ratio of the invention reaches 0.85 μm, realizes that physical resolution enters the detectivity of sub-micrometer imaging, meets
The demand that high resolution detection is imaged in high-end industrial detection machine vision.
Detailed description of the invention
Fig. 1 is the composed structure schematic diagram of optical system of the present invention；
Fig. 2 is optical system of the present invention optical transfer function curve graph at 600lp/mm；
Fig. 3 is the distortion figure of optical system of the present invention.
Specific embodiment
Essence of the invention is more fully understood for convenience of those of ordinary skill in the art, with reference to the accompanying drawing to of the invention
Specific embodiment is described in detail.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of large-numerical aperture near-infrared image bilateral telecentric optical system is included in light
Line is along the first lens 1, the second lens 2, Amici prism 3, third as being arranged successively in plane 11 to 12 direction of propagation of object plane
Lens 4, the 4th lens 5, diaphragm 6, the 5th lens 7, the 6th lens 8, the 7th lens 9, the 8th lens 10；
First lens 1, the second lens 2 constitute front lens group, the third lens 4, the 4th lens 5, the 5th lens
7, the 6th lens 8, the 7th lens 9 and the 8th lens 10 constitute rear lens group.
Near infrared illumination source carries out the coupling of illumination path and imaging optical lens by Amici prism 3.
In this preferred embodiment, CCD or CMOS camera can be being placed as plane 11, receive the amplification of industrial lens system
Object plane signal, to obtain clear powerful object plane information.
The focal power of the front lens group is set as φ A, and the focal power of the rear lens group is set as φ C, the light of the system
Focal power is set as φ,
Then the ratio of φ A and φ meets following condition:
1.8≤φA/φ≤2.2；
Then the ratio of φ C and φ meets following condition:
9.1≤φC/φ≤10.5。
In the present embodiment, each lens sizes are as follows: the 1 front surface radius of curvature of the first lens is 32.863mm, after
Surface curvature radius is -55.462mm, and center thickness 4.2mm, lens clear aperture is φ 16.8mm；Before second lens 2
Surface curvature radius is -24.588mm, and rear surface radius of curvature is 14.602mm, center thickness 2.5mm, lens clear aperture
For φ 12.2mm；The 4 front surface radius of curvature of the third lens is -468.981mm, and rear surface radius of curvature is -52.485mm,
Center thickness is 8.7mm, and lens clear aperture is φ 52.3mm；4th lens, the 5 front surface radius of curvature is
140.698mm, rear surface radius of curvature are -162.111mm, and center thickness 6.7mm, lens clear aperture is φ 50.2mm；
5th lens, the 7 front surface radius of curvature is -66.202mm, and rear surface radius of curvature is 39.859mm, and center thickness is
2.5mm, lens clear aperture are φ 48.2mm；6th lens, the 8 front surface radius of curvature is 39.859mm, rear surface curvature
Radius is -185.774mm, and center thickness 11.9mm, lens clear aperture is φ 48.2mm；7th lens, 9 front surface
Radius of curvature is 50.225mm, and rear surface radius of curvature is -578.471, and center thickness 9.6mm, lens clear aperture is φ
49.1mm；8th lens, the 10 front surface radius of curvature is 23.513mm, and rear surface radius of curvature is 35.756mm, and center is thick
Degree is 5.1mm, and lens clear aperture is φ 29.2mm
5th lens 7 form cemented doublet with the 6th lens 8.
In the present embodiment, each lens making material is as follows: first lens 1 use heavy-lanthanide flint glass material system
Be made at, second lens 2 of flint glass material, the third lens 4 are made of dense crown material, described the
Four lens 5 are made of crown glass material, the 5th lens 7 are using flint glass material is made, the 6th lens 8 are adopted
It is made of billows crown glass material, the 7th lens 9 are made of dense crown material, the 8th lens 10 are using weight lanthanum fire
Stone glass material is made.
First lens 1 using biconvex positive power lens, second lens 2 using concave-concave negative-power lenses,
The third lens 4 are using bent moon positive light coke thick lens, the 4th lens 5 using biconvex positive power lens, described the
Five lens 7 are adopted using concave-concave negative-power lenses, the 6th lens 8 using biconvex positive power lens, the 7th lens 9
Falcate positive power lens are used with biconvex positive power lens, the 8th lens 10.
In the present embodiment, each lens placement position relationship are as follows: the first lens 1 are 11.2mm at a distance from the second lens 2；The
Two lens 2 are 11.7mm at a distance from Amici prism 3；Amici prism 3 is 61.7mm at a distance from the third lens 4；The third lens 4
With at a distance from the 4th lens 5 be 3.0mm；4th lens 5 are 1.2mm at a distance from diaphragm 6；Diaphragm 6 is at a distance from the 5th lens 7
For 6.1mm；6th lens 8 are 0.5mm at a distance from the 7th lens 9；7th lens 9 are at a distance from the 8th lens 10
28.5mm；8th lens 10 are 25mm at a distance from object plane 12.
Optical system of the present invention belongs to image bilateral telecentric beam path, and the angle of object space chief ray and optical axis is no more than
0.02 °, the angle of image space chief ray and optical axis is no more than 0.05 °.
Large-numerical aperture near-infrared image bilateral telecentric optical system design parameter of the invention are as follows:
Object-side numerical aperture 0.5；4 times of multiplying power of imaging；Object space operating distance 25mm；Relative distortion is no more than 0.015%；Object
0.85 μm of square resolution ratio；Spectral coverage 800nm to 850nm is imaged.
As shown in Figure 2, the optical transfer function value of all visual fields of this optical system reaches in 600lp/mm close to 0.4
Diffraction limit image quality, image quality are good.
As seen from Figure 3, the present invention is within the scope of image space 10mm, and distortion is no more than 0.015%, close to zero,
Effectively prevent the caused measurement error that distorts.
In present example, it mainly solves near-infrared spectral coverage detection resolution and is limited to the longer skill for being not easy to improve of wavelength
Art problem realizes the optical system with high NA design of diffraction limit image quality.In order to realize 0.85 μm of high-resolution, this light
The numerical aperture of system reaches 0.5 or more；This system reaches 60 ° to the receipts angular of object plane, the main picture of optical system
Difference is that spherical aberration and coma can also generate seven grades or more aberrations other than third-order aberration and fifth-order aberration.Present example in order to
The problem is solved, using the hereby watt optical texture pattern of complication, mainly the lens group of object plane side complicate and set
Meter, undertakes focal power using intimate aplanat lens, the spherical aberration of the position is in minimum, can be effectively reduced the spherical aberration of system
Aberration；Using cemented doublet and simple lens combination correction color difference；Using two simple lens correction cemented doublet concave surfaces and glue
The spherical aberration and coma that conjunction face generates.From the point of view of aberration correction result, the design it is more perfect correct spherical aberration, coma, astigmatism, field
Bent, distortion and color difference.It is finally obtained the image quality of diffraction limit, under conditions of numerical aperture reaches 0.5, imaging point
Resolution is better than 0.85 μm, and existing product cannot achieve on the market for this.
And in present example, object space telecentricity is no more than 0.02 °, and the design of object space telecentricity can effectively solve to have an X-rayed
The problem of image fault, can obtain undistorted high-definition picture；Image space telecentricity be no more than 0.05 °, reduce CCD or
The Adjustment precision of CMOS camera and optical system.Full filed distortion is no more than 0.015%, eliminates measurement caused by distortion and misses
Difference improves the measurement accuracy of optical system.By the optical index of above-mentioned camera lens it is known that the overall length of optical system of the present invention
Only 195mm, and reach diffraction limit image quality only with 8 lens, has small in size, and light-weight, manufacturing cost is low
Advantage is conducive to be promoted on the market.
The above specific embodiment is described in detail for the essence of the present invention, but can not be come with this to of the invention
Protection scope is limited.It should be evident that under the inspiration of the essence of the present invention, those of ordinary skill in the art can also be into
The many improvement and modification of row, it should be noted that these improvement and modification all fall in claims of the invention it
It is interior.
Claims (5)
1. a kind of large-numerical aperture near-infrared image bilateral telecentric optical system, it is characterised in that: be included in light along as plane
The first lens, the second lens, Amici prism, the third lens, the 4th lens, light being arranged successively on to the object plane direction of propagation
Door screen, the 5th lens, the 6th lens, the 7th lens, the 8th lens；
First lens, the second lens constitute front lens group, and the third lens, the 4th lens, the 5th lens, the 6th are thoroughly
Mirror, the 7th lens and the 8th lens constitute rear lens group；
The focal power of the front lens group is set as φ A, and the focal power of the rear lens group is set as φ C, the focal power of the system
φ is set as,
Then the ratio of φ A and φ meets following condition:
1.8≤φA/φ≤2.2；
Then the ratio of φ C and φ meets following condition:
9.1≤φC/φ≤10.5。
2. a kind of large-numerical aperture near-infrared image bilateral telecentric optical system according to claim 1, it is characterised in that:
The first lens front surface radius of curvature be 32.863mm, rear surface radius of curvature be -55.462mm, center thickness 4.2mm,
Lens clear aperture is φ 16.8mm；The second lens front surface radius of curvature is -24.588mm, and rear surface radius of curvature is
14.602mm, center thickness 2.5mm, lens clear aperture are φ 12.2mm；The third lens front surface radius of curvature be-
468.981mm, rear surface radius of curvature are -52.485mm, and center thickness 8.7mm, lens clear aperture is φ 52.3mm；Institute
Stating the 4th lens front surface radius of curvature is 140.698mm, and rear surface radius of curvature is -162.111mm, and center thickness is
6.7mm, lens clear aperture are φ 50.2mm；The 5th lens front surface radius of curvature is -66.202mm, rear surface curvature
Radius is 39.859mm, and center thickness 2.5mm, lens clear aperture is φ 48.2mm；The 6th lens front surface curvature
Radius is 39.859mm, and rear surface radius of curvature is -185.774mm, and center thickness 11.9mm, lens clear aperture is φ
48.2mm；The 7th lens front surface radius of curvature is 50.225mm, and rear surface radius of curvature is -578.471, center thickness
For 9.6mm, lens clear aperture is φ 49.1mm；The 8th lens front surface radius of curvature is 23.513mm, and rear surface is bent
Rate radius is 35.756mm, and center thickness 5.1mm, lens clear aperture is φ 29.2mm.
3. a kind of large-numerical aperture near-infrared image bilateral telecentric optical system according to claim 1, it is characterised in that:
5th lens and the 6th lens group are at cemented doublet.
4. a kind of large-numerical aperture near-infrared image bilateral telecentric optical system according to claim 1, it is characterised in that:
First lens are saturating using concave-concave negative-power lenses, the third using biconvex positive power lens, second lens
Mirror uses concave-concave using biconvex positive power lens, the 5th lens using bent moon positive power lens, the 4th lens
Negative-power lenses, the 6th lens are saturating using biconvex positive light coke using biconvex positive power lens, the 7th lens
Mirror, the 8th lens use falcate positive power lens.
5. a kind of large-numerical aperture near-infrared image bilateral telecentric optical system according to claim 1, it is characterised in that:
First lens are made of heavy-lanthanide flint glass material, second lens are made of flint glass material, described the
Three lens are made of dense crown material, the 4th lens are made of crown glass material, the 5th lens use
Flint glass material is made, the 6th lens are made of billows crown glass material, the 7th lens are using dense crown material
Material is made, the 8th lens are made of heavy-lanthanide flint glass material.
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| CN109975963A (en) * | 2019-04-16 | 2019-07-05 | 佛山科学技术学院 | A kind of small-size long working distance from object space telecentric optical system |
| CN109975962A (en) * | 2019-04-16 | 2019-07-05 | 佛山科学技术学院 | A kind of bilateral telecentric optical system with long reach |
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| CN110007448A (en) * | 2019-04-16 | 2019-07-12 | 佛山科学技术学院 | A kind of double telecentric optical system of ultra-low distortion |
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| CN110196487A (en) * | 2019-06-17 | 2019-09-03 | 上海帆声图像科技有限公司 | A kind of telecentric lens |
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