CN206369893U - A kind of fringe projection camera lens for three-dimensional measurement - Google Patents
A kind of fringe projection camera lens for three-dimensional measurement Download PDFInfo
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- CN206369893U CN206369893U CN201621311468.3U CN201621311468U CN206369893U CN 206369893 U CN206369893 U CN 206369893U CN 201621311468 U CN201621311468 U CN 201621311468U CN 206369893 U CN206369893 U CN 206369893U
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Abstract
The utility model provides a kind of fringe projection camera lens for three-dimensional measurement, and it includes front lens group, diaphragm and the rear lens group with positive light coke with negative power successively from the object side to the image side；Front lens group includes the first lens, the second lens and the 3rd lens successively from the object side to the image side；First lens are the meniscus lens with negative power；Second lens are the biconcave lens with negative power；3rd lens are the biconvex lens with positive light coke；Rear lens group object space includes the 4th lens, the 5th lens, the 6th lens and the 7th lens successively to image space；4th lens are the biconvex lens with positive light coke；5th lens are the biconcave lens with negative power；6th lens are the biconvex lens with positive light coke；7th lens are the meniscus lens with negative power.The utility model, which is provided, can be achieved distort small small, size, high pass optical property and the camera lens for meeting fine definition projection requirements.
Description
【Technical field】
The utility model is related to a kind of optical lens, more particularly to a kind of fringe projection camera lens for three-dimensional measurement.
【Background technology】
There are a variety of methods for the three-dimensional measurement of structure light, conventional method is to generate striped using computer, by striped
Projection obtains the three-D profile image of destination object, i.e., gone in the bar graph projection generated using computer to destination object, with
The three-D profile image of destination object is obtained, but this method is confined to the depth of focus, projected area and definition, certain journey
The life-span of bulb is also limited on degree.
In order to solve inherent shortcoming of traditional fringe projection method when carrying out three-dimensional measurement, replaced using acousto-optic the Schlieren method
The method that fringe projection method carries out three-dimensional measurement is arisen at the historic moment.Acousto-optic the Schlieren method replaces the method that computer generates grating fringe,
Real interference fringe can be projected to go to destination object, it has the very big depth of focus and real sine streak, special
Three-dimensional measurement is not conducive to.
And the projection lens thang-kng performance that traditional acousto-optic the Schlieren method carries out the projection arrangement of three-dimensional measurement is weaker, resolving power
It is relatively low, it is impossible to meet the requirement of three-dimension measuring system high pass light ability and fine definition.
【Utility model content】
To overcome the shortcomings of that prior art is present.The utility model provides a kind of fringe projection mirror for three-dimensional measurement
Head.
The technical scheme that the utility model solves technical problem is to provide a kind of fringe projection camera lens for three-dimensional measurement,
The fringe projection camera lens for being used for three-dimensional measurement include successively from the object side to the image side with the front lens group of negative power, diaphragm with
And the rear lens group with positive light coke；The front lens group from the object side to the image side successively include the first lens, the second lens with
And the 3rd lens；First lens are the meniscus lens with negative power, and convex surface facing object space；Second lens are
Biconcave lens with negative power；3rd lens are the biconvex lens with positive light coke；The rear lens group object space
Include the 4th lens, the 5th lens, the 6th lens and the 7th lens successively to image space；4th lens are with positive light focus
The biconvex lens of degree；5th lens are the biconcave lens with negative power；6th lens are with positive light coke
Biconvex lens；7th lens are the meniscus lens with negative power, and convex surface facing object space；4th lens and
5th lens combination is into a balsaming lens；First lens are aspherical close to object space one side, and the 7th lens are close to picture
Side is simultaneously aspherical.
Preferably, the fringe projection camera lens for three-dimensional measurement meets 76.36mm≤TTL≤79.92mm, and TTL is
First lens object space side outermost point of the fringe projection camera lens for three-dimensional measurement to imaging surface distance.
Preferably, the fringe projection camera lens for three-dimensional measurement meet 8.08≤TTL/EFL of condition formula≤
10.52, wherein TTL for fringe projection camera lens the first lens object space side outermost point for three-dimensional measurement to imaging surface away from
From EFL is used for the total focal length value of the fringe projection camera lens of three-dimensional measurement for described in.
Preferably, the fringe projection camera lens for three-dimensional measurement meets condition formula 5.87≤TTL/FFL≤6.51,
Wherein TTL is used for the first lens object space side outermost point of the fringe projection camera lens of three-dimensional measurement to the distance of imaging surface for described in,
FFL is distance of the first lens image side outermost point to imaging surface.
Preferably, the fringe projection camera lens for three-dimensional measurement meets condition formula 0.32≤BFL/EFL≤0.40,
Wherein FFL is distance of the first lens image side outermost point to imaging surface, and BFL is the fringe projection camera lens for three-dimensional measurement
7th lens image side outermost point to imaging surface distance.
Preferably, the fringe projection camera lens for three-dimensional measurement meet after condition formula 18.06mm≤F≤
The focal length value of rear lenses group is represented after 44.80mm, wherein F.
Preferably, the fringe projection camera lens for three-dimensional measurement meet after condition formula -1.11≤F/F before≤-
The focal length value of front lens group is represented before 0.54, wherein F.
Preferably, the fringe projection camera lens for three-dimensional measurement meets 72.45 °≤FOV≤72.56 ° of condition formula,
Wherein FOV represents the maximum field of view angle of wide-angle lens.
Preferably, the lens of fringe projection camera lens first for three-dimensional measurement meet condition formula 0.05≤(d/h)/
FOV≤0.06, wherein d represent maximum clear aperture of the first lens corresponding to maximum field of view angle towards object space convex surface, and h is represented
Imaging image height corresponding to maximum field of view angle.
Preferably, the fringe projection camera lens for three-dimensional measurement meets after 2.96≤F of condition formula glue/F≤4.71,
Wherein F glue represents to represent the focal length value of front lens group before the focal length value of balsaming lens, F.
The utility model is smaller for the cramped construction TTL that the fringe projection camera lens of three-dimensional measurement employs ultrashort focal length,
Realize that the angle of visual field and projected area are maximized, cause a counterlath in distance for the projected area of 1 meter of at least 40 inches of position
Line figure can once cover larger surface as early as possible, enable a system to capture enough object informations and realize high-precision striped
Figure.Aberration rate is small, is up to more than 80% in the mtf value of all spatial frequencys, ray aberration is only existed from -0.025 to 0.025
In the range of, image quality is more excellent.
Meanwhile, the first lens are aspherical close to object space one side, and the 7th lens are aspherical close to image space one side, and this is used for
The fringe projection camera lens of three-dimensional measurement can just reach preferable aberration correction effect with less non-spherical lens, save simultaneously
Cost
The fringe projection camera lens for three-dimensional measurement that further the utility model is provided, achievable cost is low, lightweight,
Distort that small, size is small, high pass optical property and the fringe projection camera lens for three-dimensional measurement for meeting fine definition requirement.
【Brief description of the drawings】
Fig. 1 is a kind of structural representation of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model.
Fig. 2A is a kind of chromatic curve figure of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model.
Fig. 2 B are a kind of astigmatism curvature of field lines of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model
Figure.
Fig. 2 C are that a kind of distortion aberration of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model is bent
Line
Fig. 3 is a kind of MTF curve figure of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model.
Fig. 4 is a kind of radial energy curve of fringe projection camera lens first embodiment for three-dimensional measurement of the utility model
Figure.
Fig. 5 is a kind of structural representation of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model.
Fig. 6 A are a kind of chromatic curve figures of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model.
Fig. 6 B are a kind of astigmatism curvature of field lines of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model
Figure.
Fig. 6 C are that a kind of distortion aberration of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model is bent
Line
Fig. 7 is a kind of MTF curve figure of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model.
Fig. 8 is a kind of radial energy curve of fringe projection camera lens second embodiment for three-dimensional measurement of the utility model
Figure.
【Embodiment】
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to solve
The utility model is released, is not used to limit the utility model.
Referring to Fig. 1, the utility model provides a kind of fringe projection camera lens for three-dimensional measurement.This is used for three-dimensional measurement
Fringe projection camera lens include successively with the front lens group of negative power, diaphragm and with positive light coke from the object side to the image side
Rear lens group, front lens group from the object side to the image side successively include the first lens L1, the second lens L2 and the 3rd lens L3.Afterwards
The object space of lens group 30 includes the 4th lens L4, the 5th lens L5, the 6th lens L6 and the 7th lens L7 successively to image space.
As shown in figure 1, the fringe projection camera lens for three-dimensional measurement is followed successively by the first lens L1 by object space to image space,
Second lens L2, the 3rd lens L3, diaphragm R7 (FNO), the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens
L7, colour filter GF and imaging surface IMA.First lens L1 is the meniscus lens with negative power, and convex surface facing object space,
One lens L1 is aspherical close to object space one side, is the plastic lens of sphere close to image space one side；Second lens L2 is that have to bear
The biconcave lens of focal power, and two sides is all the glass lens of sphere；3rd lens L3 is the biconvex lens with positive light coke,
Be two sides be all sphere glass lens；4th lens L4 is the biconvex lens with positive light coke, is that two sides is all sphere
Glass lens；5th lens L5 is the biconcave lens with negative power, be two sides be all sphere glass lens, and the 4th is saturating
Mirror L4 and the 5th lens L5 are combined into a balsaming lens, and carrying out bonding engagement using glue forms a lens subassembly, and engagement
Face convex surface facing image side；6th lens L6 is the biconvex lens with positive light coke, and be two sides be all sphere plastics
Lens；7th lens L7 is the meniscus lens with negative power, and convex surface facing object space, the 7th lens L7 is close to object space one side
It is aspherical, is the plastic lens of sphere close to image space one side.
Form one is used for the fringe projection camera lens specification and its optical parametric table of three-dimensional measurement.
Form one：
| Aperture F | 2.8 | Entrance pupil aperture | 3.37mm |
| Maximum field of view angle | 72.45° | Maximum spatial frequency | 32lp/mm |
| Overall length TTL | 76.36mm | Resolution ratio | 0.48Mp |
| Focal length f | 9.45mm | Diagonal-size | 0.378″ |
| Maximum distortion | - 3% | Face battle array size | 800H×600V |
| Image height y | 6.92mm | Imaging area | 7.68mm×5.76mm |
| View field A | 40 inches | Projector distance l | 1m |
The relevant parameter of form two is that this is used for the fringe projection camera lens of three-dimensional measurement from object space (OBJ) to image space (IMA)
The surface type in each face of all lens, radius of curvature, center thickness, half clear aperture, refractive index and Abel are normal
The relevant parameters such as number.
Form two：
Form three is the detailed geometric parameter of face serial number R1 and R13 aspherical mirror.
Form three：
According to form one, we understand in form two and form three, and this is used for the fringe projection camera lens choosing of three-dimensional measurement
800 × 600 pixel resolutions are selected, format optical d is 0.378 " (7.68mm × 5.76mm), the specific optical requirement such as institute of table 2
List.In these requirements, the relation of focal length and projector distance meets equation：
F=l × d/A=1000 × 0.378/40=9.45mm
Wherein, f represents focal length, and l represents projector distance, and d represents format optical, and A represents projected area.
Because projection angle is less than 80 °, below equation is met to calculate the angle of visual field with rectangular projection：
ω represents the half of the angle of visual field, i.e. FOV=72.45 ° of maximum field of view angle.Y is image height.As for the special of maximum
Frequency F is met：
F=1/ (2 × s)=1/ (2 × 0.016)=31.25lp/mm,
S represents pixel size.
According to above-described embodiment data, the related data of following table four is obtained.
Form four：
Wherein, EFL is the total focal length value of the fringe projection camera lens for three-dimensional measurement, and BFL is the bar for three-dimensional measurement
7th lens L7 image sides outermost point of line projection lens is to the distance of imaging surface, and TTL is the striped for three-dimensional measurement
First lens L1 object spaces side outermost point of projection lens is to the distance of imaging surface, and FFL is the fringe projection mirror for three-dimensional measurement
Head the first lens L1 image sides outermost point to imaging surface distance.
D represents maximum clear aperture of the first lens corresponding to maximum field of view angle towards object space convex surface, and h represents that maximum is regarded
The image height of imaging corresponding to rink corner.
F1, F2, F3, F5, F6 represent the respective focal length value of first, second and third, five, six lens respectively.Before F, after F respectively
Front lens group, the focal length value of rear lenses group are represented, F glue represents the focal length value of balsaming lens.
Maximum Distortion=-3%, wherein Distortion are the abnormal of the fringe projection camera lens for three-dimensional measurement
Become.
First lens L1 meets following condition formulas：(d/h)/FOV=0.05,
First lens L1 meets following condition formula：Nd >=1.59, Vd≤29.45, the high chromatic dispersion material of high index of refraction,
The quick light of energy, and the value of chromatism in high chromatic dispersion material energy effective compensation optical system, wherein Nd are refractive index, and Vd is that Abbe is normal
Number.
Second lens L2 uses refractive index Nd >=1.75, the high-refractivity and low-dispersion material of Abbe constant Vd >=60；4th
Lens L4 uses refractive index Nd >=1.5, the high-refractivity and low-dispersion material of Abbe constant Vd >=60；6th lens L6 is using refraction
Rate Nd >=1.5, the high-refractivity and low-dispersion material of Abbe constant Vd >=60 can effectively import 70 ° of -80 ° of angles of visual field, light and subtract
The bore of small first eyeglass, satisfaction obtains preferable drop shadow effect in the range of shorter ttl value, to avoid volume excessive.
3rd lens L3 meets following condition formula：Nd >=1.75, Vd≤27.5, the high chromatic dispersion material of high index of refraction,
7th lens L7 meets following condition formula：Nd >=1.50, Vd≤30, the high chromatic dispersion material of high index of refraction, can quickly assemble
Incident light, and the value of chromatism in high chromatic dispersion material energy effective compensation optical system, wherein Nd are refractive index, and Vd is that Abbe is normal
Number.
4th lens L4 and the 5th lens L5 use bond layout, to be effectively improved the aberration of optical system.So as to be beneficial to
Improve the thang-kng ability and resolving power of whole optical system.
It is chromatic curve figure (can also be spherical aberration curve map) to refer to Fig. 2A-2C and Fig. 3-Fig. 4, Fig. 2A, by what is commonly used
Red (C), green (D), the wavelength of blue (F) light represent that unit is mm.2B is astigmatism curvature of field line chart, is represented for three-dimensional measurement
The filed curvature degree that fringe projection camera lens is imaged caused by astigmatism, by commonly using green (D) light representations, unit is light in mm, figure
Line aberration is only existed in the range of from -0.025 to 0.025, and imaging performance is excellent.Fig. 2 C are distortion curve figures, represent that difference is regarded
Distortion sizes values in the case of rink corner, unit is %, and this is used for the fringe projection lens optical distortion of three-dimensional measurement<- 3%.Fig. 3
Mtf value curve map, expression be resolution of lens size, be up to more than 80%, figure in the mtf value of all spatial frequencys
4 be the energy diagram that geometry hot spot is ensphered under the different angles of visual field, expression be lens imaging picture point brightness, the wherein angle of visual field is
Zero degree is the picture point brightness highest of the fringe projection lens imaging for three-dimensional measurement, and maximum field of view angle is 72.45 °.
Referring to Fig. 5, the utility model second embodiment provided for the fringe projection camera lens of three-dimensional measurement and
Unlike the fringe projection camera lens for three-dimensional measurement that one embodiment is provided：What second embodiment was provided is used for three-dimensional
The fringe projection camera lens total focal length value of measurement is that 7.6mm, ttl value are 79.92mm, 72.56 ° of maximum field of view's angle FOV values, specific ginseng
Number refers to form five, six and form seven.
Form five be the utility model second embodiment provided for three-dimensional measurement fringe projection camera lens specification and
Its optical parametric table.
Form five
ω=36.28 °, ω represents the half of the angle of visual field, maximum field of view angle FOV=2 ω=72.56 °.
The relevant parameter of form six be this be used for three-dimensional measurement fringe projection camera lens from object space (OBJ) to image space (IMA),
The surface type in each face of all lens, radius of curvature, center thickness, half clear aperture, refractive index and Abel are normal
The relevant parameters such as number.
Form six：
According to above-described embodiment data, the related data of following table seven is obtained.
Form seven：
| Basic parameter | EFL | BFL | TTL | FFL | d | h |
| Numerical value (mm) | 7.6 | 3 | 79.92 | 12.28 | 23.48 | 5.58 |
| Basic parameter | F1 | F2 | F3 | F glue | F6 | F7 |
| Numerical value (mm) | -24.925 | -20.67 | 30.72 | 85.11 | 19.98 | 67.14 |
| Basic parameter | Before F | After F | ||||
| Numerical value (mm) | -33.52 | 18.06 |
Fringe projection lens focus for three-dimensional measurement is met, and 8.08≤TTL/EFL≤10.52, wherein TTL are described
Fringe projection camera lens the first lens object space side outermost point for three-dimensional measurement is to the distance of imaging surface, and EFL is to be described for three
Tie up the total focal length value of the fringe projection camera lens of measurement；5.87≤TTL/FFL≤6.51, wherein FFL be the first lens image side most
Exterior point to imaging surface distance；76.36mm≤TTL≤79.92mm, TTL are used for the fringe projection camera lens of three-dimensional measurement to be described
The first lens object space side outermost point to imaging surface distance；0.32≤BFL/EFL≤0.40, wherein BFL are for three-dimensional survey
7th lens image side outermost point of the fringe projection camera lens of amount to imaging surface distance；After 18.06mm≤F≤44.80mm, its
The focal length value of rear lenses group is represented after middle F；After -1.11≤F/F before≤- 0.54, the focal length of front lens group is represented before wherein F
Value；After 2.96≤F glue/F≤4.71, wherein F glue represents the focal length value of balsaming lens.
It is chromatic curve to refer to figure in Fig. 6 A-6C and Fig. 7,8, the optical performance curve figure of second embodiment, its 6A
Scheme (being also spherical aberration curve map), represented by the wavelength of conventional red (C), green (D), blue (F) three coloured light, unit is mm.6B is
Astigmatism curvature of field line chart, represents the filed curvature degree that the fringe projection camera lens for three-dimensional measurement is imaged caused by astigmatism, by
Conventional green (D) light representations, unit is mm.Fig. 6 C are distortion curve figures, represent the distortion sizes values in the case of the different angles of visual field,
Unit is distortion in %, figure<- 6%.Fig. 7 is mtf value curve map, expression be resolution of lens size figure in, all
The mtf value of spatial frequency is up to more than 80%, and ray aberration is only existed in the range of from -0.025 to 0.025, and image quality is more
Plus it is excellent.Fig. 8 is the energy diagram that geometry hot spot is ensphered under the different angles of visual field, expression be lens imaging picture point brightness, its
The middle angle of visual field be zero degree be fringe projection lens imaging for three-dimensional measurement picture point brightness highest, maximum field of view angle is
72.56°。
The utility model by rationally controlling each lens between focal length distribution, realize the fringe projection for three-dimensional measurement
The ultrashort focal length cramped construction of camera lens, TTL keeps minimum, while the angle of visual field and projected area are maximized, in the position that distance is 1 meter
The projected area for putting at least 40 inches enables a secondary bar graph once to cover big surface as early as possible, enables a system to catch
To enough object informations and realizing high-precision bar graph.Especially meet the three-dimensional measurement of structure light.First lens are close to object space
It is simultaneously aspherical, the 7th lens are aspherical close to image space one side, and this is used for the fringe projection camera lens of three-dimensional measurement with less
Non-spherical lens can just reach preferable aberration correction effect, while cost-effective.
Meanwhile, the focal power allocation proportion of forward and backward lens group is rationally controlled, is on the one hand conducive to controlling front lens group
Incident ray height, to reduce the external diameter of optical system senior aberration and eyeglass；On the other hand it can reduce by rear lenses group
Chief ray shooting angle, to improve the relative luminance of optical system.
The fringe projection camera lens for three-dimensional measurement that further the utility model is provided, achievable cost is low, lightweight,
Distort that small, size is small, high pass optical property and the fringe projection camera lens for three-dimensional measurement for meeting fine definition requirement, while because
More plastic aspheric lens are employed, lighter weight and relatively low cost can be kept.
The utility model preferred embodiment is the foregoing is only, it is all in this reality not to limit the utility model
With any modification made within new principle, equivalent substitution and improvement etc. all should include the utility model.
Claims (10)
1. a kind of fringe projection camera lens for three-dimensional measurement, it is characterised in that：Include that there is negative light successively from the object side to the image side
Front lens group, diaphragm and the rear lens group with positive light coke of focal power；
The front lens group includes the first lens, the second lens and the 3rd lens successively from the object side to the image side；
First lens are the meniscus lens with negative power, and convex surface facing object space；Second lens are that have to bear
The biconcave lens of focal power；3rd lens are the biconvex lens with positive light coke；
The rear lens group object space includes the 4th lens, the 5th lens, the 6th lens and the 7th lens successively to image space；
4th lens are the biconvex lens with positive light coke；5th lens are that the concave-concave with negative power is saturating
Mirror；6th lens are the biconvex lens with positive light coke；7th lens are the meniscus lens with negative power,
And convex surface facing object space；
4th lens and the 5th lens combination are into a balsaming lens；
First lens are aspherical close to object space one side, and the 7th lens are aspherical close to image space one side.
2. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：It is described to be used for three-dimensional measurement
Fringe projection camera lens meet condition formula 76.36mm≤TTL≤79.92mm, TTL throws for the striped for three-dimensional measurement
First lens object space side outermost point of shadow camera lens to imaging surface distance.
3. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula 8.08
≤ TTL/EFL≤10.52, wherein TTL are used for fringe projection camera lens the first lens object space side outermost point of three-dimensional measurement to be described
To the distance of imaging surface, EFL is used for the total focal length value of the fringe projection camera lens of three-dimensional measurement for described in.
4. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula 5.87
≤ TTL/FFL≤6.51, wherein TTL are used for the first lens object space side outermost point of the fringe projection camera lens of three-dimensional measurement for described in
To the distance of imaging surface, FFL is distance of the first lens image side outermost point to imaging surface.
5. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula 0.32
≤ BFL/EFL≤0.40, wherein FFL are distance of the first lens image side outermost point to imaging surface, and BFL is for three-dimensional measurement
Fringe projection camera lens the 7th lens image side outermost point to imaging surface distance.
6. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula
After 18.06mm≤F≤44.80mm, the focal length value of rear lenses group is represented after wherein F.
7. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 6, it is characterised in that：Meet condition formula-
After 1.11≤F/F before≤- 0.54, the focal length value of front lens group is represented before wherein F.
8. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula
72.45 °≤FOV≤72.56 °, wherein FOV represents the maximum field of view angle of wide-angle lens.
9. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 8, it is characterised in that：First lens meet condition
Formula 0.05≤(d/h)/FOV≤0.06, wherein d represents the first lens corresponding to maximum field of view angle towards object space convex surface most
Big clear aperture, h represents the imaging image height corresponding to maximum field of view angle.
10. it is used for the fringe projection camera lens of three-dimensional measurement as claimed in claim 1, it is characterised in that：Meet condition formula
After 2.96≤F glue/F≤4.71, wherein F glue represents to represent the focal length value of front lens group before the focal length value of balsaming lens, F.
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| CN108132526A (en) * | 2016-12-01 | 2018-06-08 | 广西师范大学 | A kind of fringe projection camera lens for three-dimensional measurement |
| CN109298584A (en) * | 2018-12-04 | 2019-02-01 | 深圳市大象投影显示技术有限责任公司 | Projection lens and projector |
| CN110260821A (en) * | 2019-05-28 | 2019-09-20 | 深圳市菲森科技有限公司 | Optics module and three dimensional analysis system based on fringe projection |
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| CN108132526A (en) * | 2016-12-01 | 2018-06-08 | 广西师范大学 | A kind of fringe projection camera lens for three-dimensional measurement |
| CN107526155A (en) * | 2017-08-31 | 2017-12-29 | 舜宇光学(中山)有限公司 | Glass modeling mixing tight shot |
| CN107526155B (en) * | 2017-08-31 | 2023-11-07 | 舜宇光学(中山)有限公司 | Glass-plastic mixed prime lens |
| CN109298584A (en) * | 2018-12-04 | 2019-02-01 | 深圳市大象投影显示技术有限责任公司 | Projection lens and projector |
| CN109298584B (en) * | 2018-12-04 | 2021-04-02 | 深圳小象光显有限公司 | Projection lens and projector |
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| CN114111640A (en) * | 2021-12-03 | 2022-03-01 | 北京理工大学 | Sine stripe structured light projection system and working method |
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