CN108132526B - Stripe projection lens for three-dimensional measurement - Google Patents
Stripe projection lens for three-dimensional measurement Download PDFInfo
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- CN108132526B CN108132526B CN201611092739.5A CN201611092739A CN108132526B CN 108132526 B CN108132526 B CN 108132526B CN 201611092739 A CN201611092739 A CN 201611092739A CN 108132526 B CN108132526 B CN 108132526B
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- 238000005259 measurement Methods 0.000 title claims abstract description 89
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 238000003384 imaging method Methods 0.000 claims description 21
- 239000003292 glue Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Abstract
The invention provides a stripe projection lens for three-dimensional measurement, which consists of a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power in sequence from an object side to an image side; the front lens group consists of a first lens, a second lens and a third lens from an object side to an image side in sequence; the first lens is a meniscus lens having a negative power; the second lens is a biconcave lens with negative focal power; the third lens is a double-convex lens having positive optical power; the rear lens group consists of a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object space to the image space in sequence; the fourth lens is a double-convex lens having positive optical power; the fifth lens is a biconcave lens with negative focal power; the sixth lens is a biconvex lens having a positive optical power; the seventh lens is a meniscus lens having a negative power. The invention provides the lens which has the advantages of low cost, light weight, small distortion, small size and high light-passing performance and meets the requirement of high-definition projection.
Description
[ technical field ] A method for producing a semiconductor device
The present disclosure relates to optical lenses, and particularly to a fringe projection lens for three-dimensional measurement.
[ background of the invention ]
There are various methods for three-dimensional measurement of structured light, and the conventional method is to use a computer to generate stripes and project the stripes to obtain a three-dimensional contour image of a target object, i.e. to use a computer-generated stripe pattern to project on the target object to obtain the three-dimensional contour image of the target object, but this method is limited to the depth of focus, the projected area and the definition, and is limited to the life of the bulb to some extent.
In order to solve the inherent defects of the traditional fringe projection method in three-dimensional measurement, the method for performing three-dimensional measurement by using the acousto-optic fringe method instead of the fringe projection method is developed. The acousto-optic fringe method can project real interference fringes onto a target object instead of a method of generating grating fringes by a computer, has large focusing depth and real sinusoidal fringes, and is particularly favorable for three-dimensional measurement.
The projection lens of the projection device for three-dimensional measurement by the traditional acousto-optic fringe method has weak light transmission performance and low resolution, and cannot meet the requirements of high light transmission capacity and high definition of a three-dimensional measurement system.
[ summary of the invention ]
In order to overcome the defects of the prior art. The invention provides a stripe projection lens for three-dimensional measurement, which is used for three-dimensional measurement of stripes.
The technical scheme for solving the technical problem is to provide a stripe projection lens for three-dimensional measurement of stripes, wherein the stripe projection lens for three-dimensional measurement of stripes consists of a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power from an object space to an image space in sequence; the front lens group consists of a first lens, a second lens and a third lens from an object side to an image side in sequence; the first lens is a meniscus lens with negative focal power, and the convex surface faces the object space; the second lens is a biconcave lens having a negative optical power; the third lens is a double-convex lens having a positive optical power; the rear lens group is composed of a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object space to the image space in sequence; the fourth lens is a double-convex lens having a positive optical power; the fifth lens is a biconcave lens having a negative optical power; the sixth lens is a double-convex lens having a positive optical power; the seventh lens is a meniscus lens with negative focal power, and the convex surface faces the object space; the fourth lens and the fifth lens are combined into a cemented lens; the stripe projection lens for three-dimensional measurement meets the condition that TTL is not less than 76.36mm and not more than 79.92mm, and the TTL is the distance from the outermost point of the object side of the first lens of the stripe projection lens for three-dimensional measurement to an imaging surface.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional formula 8.08 ≤ TTL/EFL ≤ 10.52, where EFL is a total focal length value of the fringe projection lens for three-dimensional measurement.
Preferably, the first lens surface close to the object side is aspheric, and the seventh lens surface close to the image side is aspheric.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional expression 5.87 ≦ TTL/FFL ≦ 6.51, where FFL is the distance from the outermost point on the image side of the first lens to the imaging plane.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional formula of 0.32 ≤ BFL/EFL ≤ 0.40, where EFL is a total focal length value of the fringe projection lens for three-dimensional measurement, and BFL is a distance from an outermost point on an image side of a seventh lens of the fringe projection lens for three-dimensional measurement to an imaging plane.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional expression 18.06mm ≦ 44.80mm after F, where F after represents the focal length value of the rear lens group.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional formula-1.11 ≦ Fpost/Fpre ≦ -0.54, where Fpre represents the focal length value of the front lens group.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional formula 72.45 DEG.ltoreq.FOV.ltoreq.72.56, where FOV denotes a maximum angle of view of the fringe projection lens, and the fringe projection lens for three-dimensional measurement has a projection area of at least 40 inches at a position having a distance of 1 meter.
Preferably, the first lens of the fringe projection lens for three-dimensional measurement satisfies the conditional formula of 0.05 ≦ (d/h)/FOV ≦ 0.06, where d represents the maximum clear aperture of the first lens toward the object side convex surface corresponding to the maximum field angle, and h represents the imaging image height corresponding to the maximum field angle.
Preferably, the fringe projection lens for three-dimensional measurement satisfies the conditional expression 2.96 ≦ F glue/F rear ≦ 4.71, where F glue represents the focal length value of the cemented lens, and F rear represents the focal length value of the rear lens group.
The stripe projection lens for three-dimensional measurement adopts a compact structure with an ultra-short focal length, the TTL is small, the maximization of the field angle and the projection area is realized, and at least 40 inches of projection area is arranged at a position with a distance of 1 meter, so that a pair of stripe patterns can cover a larger surface as soon as possible, a system can capture enough object information, and a high-precision stripe pattern is realized. The distortion rate is small, the MTF value of all spatial frequencies is up to more than 80%, the light ray aberration only exists in the range of-0.025 to 0.025, and the imaging quality is more excellent.
Meanwhile, one surface of the first lens, which is close to the object side, is an aspheric surface, one surface of the seventh lens, which is close to the image side, is an aspheric surface, so that the fringe projection lens for three-dimensional measurement can achieve a better aberration correction effect by using fewer aspheric lenses, and meanwhile, the cost is saved
Further, the fringe projection lens for three-dimensional measurement provided by the invention has the advantages of low cost, light weight, small distortion, small size, high light-passing performance and high definition.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of a fringe projection lens for three-dimensional measurement according to a first embodiment of the present invention.
Fig. 2A is a color difference graph of a fringe projection lens according to a first embodiment of the present invention for three-dimensional measurement.
FIG. 2B is an astigmatic field curve diagram of a first embodiment of a fringe projection lens used in three-dimensional measurements according to the present invention.
FIG. 2C is a distortion aberration curve of the first embodiment of the fringe projection lens for three-dimensional measurement according to the present invention
Fig. 3 is a MTF graph of a first embodiment of a fringe projection lens for three-dimensional measurement according to the present invention.
FIG. 4 is a radial energy diagram of a first embodiment of a fringe projection lens for three-dimensional measurement according to the present invention.
Fig. 5 is a schematic structural diagram of a fringe projection lens for three-dimensional measurement according to a second embodiment of the present invention.
Fig. 6A is a color difference graph of a fringe projection lens for three-dimensional measurement according to a second embodiment of the present invention.
FIG. 6B is an astigmatic field curve diagram of a second embodiment of a fringe projection lens used in three-dimensional measurements according to the present invention.
FIG. 6C is a distortion aberration curve of a second embodiment of a fringe projection lens for three-dimensional measurement in accordance with the present invention
Fig. 7 is a MTF graph of a second embodiment of a fringe projection lens for three-dimensional measurement according to the present invention.
FIG. 8 is a radial energy diagram of a second embodiment of a fringe projection lens for three-dimensional measurement according to the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a fringe projection lens for three-dimensional measurement. The fringe projection lens for three-dimensional measurement comprises a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power in sequence from an object side to an image side, wherein the front lens group comprises a first lens L1, a second lens L2 and a third lens L3 in sequence from the object side to the image side. The rear lens group 30 includes, in order from the object side to the image side, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
As shown in fig. 1, the fringe projection lens for three-dimensional measurement includes, in order from an object side to an image side, a first lens L1, a second lens L2, a third lens L3, a diaphragm R7(FNO), a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a color filter GF, and an image plane IMA. The first lens L1 is a meniscus lens with negative focal power, and has a convex surface facing the object, and the first lens L1 is a plastic lens whose object side is aspheric and image side is spherical; the second lens L2 is a biconcave lens having negative optical power, and is a glass lens whose both surfaces are spherical; the third lens L3 is a double-convex lens having positive refractive power, and is a glass lens whose both surfaces are spherical; the fourth lens L4 is a double-convex lens having positive refractive power, and is a glass lens whose both surfaces are spherical; the fifth lens L5 is a biconcave lens with negative focal power, and is a glass lens with spherical surfaces on both sides, and the fourth lens L4 and the fifth lens L5 are combined into a cemented lens, and are bonded and jointed by glue to form a lens assembly, and the convex surface of the joint surface faces the image side; the sixth lens L6 is a double-convex lens having a positive power, and is a plastic lens whose both surfaces are spherical; the seventh lens L7 is a meniscus lens with negative power and has a convex surface facing the object side, and the seventh lens L7 is a plastic lens whose object side surface is aspheric and image side surface is spherical.
The table is a fringe projection lens specification for three-dimensional measurement and an optical parameter table thereof.
A first table:
the table two related parameters are related parameters such as the surface type, the curvature radius, the center thickness, the semi-clear aperture, the refractive index, and the abelian constant of each surface of all the lenses from the object side (OBJ) to the image side (IMA) of the fringe projection lens for three-dimensional measurement.
Table two:
table III shows the detailed geometry of the aspherical mirrors with surface numbers R1 and R13.
Table three:
from table one, table two and table three, the fringe projection lens for three-dimensional measurement selects a resolution of 800 × 600 pixels, has an optical format d of 0.378 ″ (7.68mm × 5.76mm), and has the specific optical requirements as listed in table 2. Among these requirements, the relationship of the focal length to the projection distance satisfies the equation:
f＝l×d/A＝1000×0.378/40＝9.45mm
where f represents the focal length, l represents the projection distance, d represents the optical format, and A represents the projection area.
Because the projection field angle is less than 80 °, calculating the field angle with orthogonal projection satisfies the following equation:
ω denotes a half of the angle of view, i.e., the maximum angle of view FOV is 72.45 °. y is the imaging height. As for the maximum special frequency F, it satisfies:
F＝1/(2×s)＝1/(2×0.016)＝31.25lp/mm,
s represents the pixel size.
Based on the example data above, the relevant data of table four below was obtained.
Table four:
| basic parameters | EFL | BFL | TTL | FFL | d | h |
| Numerical value (mm) | 9.45 | 3 | 76.36 | 13 | 26 | 6.93 |
| Basic parameters | F1 | F2 | F3 | F glue | F6 | F7 |
| Numerical value (mm) | -24.8 | -21.8 | 28.6 | 132.45 | 18.5 | 71.2 |
| Basic parameters | F front | F after | ||||
| Numerical value (mm) | -40.4 | 44.8 |
Wherein, EFL is a total focal length value of the fringe projection lens for three-dimensional measurement, BFL is a distance from an outermost point on an image side of a seventh lens L7 of the fringe projection lens for three-dimensional measurement to an imaging surface, TTL is a distance from an outermost point on an object side of a first lens L1 of the fringe projection lens for three-dimensional measurement to the imaging surface, and FFL is a distance from an outermost point on the image side of a first lens L1 of the fringe projection lens for three-dimensional measurement to the imaging surface.
d represents the maximum clear aperture of the first lens toward the object side convex surface corresponding to the maximum angle of view, and h represents the image height of the image formed corresponding to the maximum angle of view.
F1, F2, F3, F5 and F6 respectively represent focal length values of the first, second, third, fifth and sixth lenses. F front and F back respectively represent the focal length values of the front lens group and the rear lens group, and F glue represents the focal length value of the cemented lens.
The maximum Distortion is-3%, where Distortion is the Distortion of the fringe projection lens for three-dimensional measurement.
The first lens L1 satisfies the following conditional formula: (d/h)/FOV is 0.05,
the first lens L1 satisfies the following conditional formula: the high-refractive-index high-dispersion material with Nd being more than or equal to 1.59 and Vd being less than or equal to 29.45 can quickly absorb light, and the high-dispersion material can effectively compensate the chromatic aberration value in an optical system, wherein Nd is the refractive index, and Vd is the Abbe constant.
The second lens L2 is made of a high-refractive-index low-dispersion material with a refractive index Nd being more than or equal to 1.75 and an Abbe constant Vd being more than or equal to 60; the fourth lens L4 is made of a high-refractive-index low-dispersion material with a refractive index Nd being more than or equal to 1.5 and an Abbe constant Vd being more than or equal to 60; the sixth lens L6 is made of a high-refractive-index low-dispersion material with the refractive index Nd being more than or equal to 1.5 and the Abbe constant Vd being more than or equal to 60, can effectively guide in the field angle of 70-80 degrees and light rays and reduce the aperture of the first lens, and meets the requirement of obtaining a good projection effect within a short TTL value range so as to avoid overlarge volume.
The third lens L3 satisfies the following conditional formula: nd is more than or equal to 1.75, Vd is less than or equal to 27.5, and the seventh lens L7 meets the following conditional formula: the high-refractive-index high-dispersion material with Nd being more than or equal to 1.50 and Vd being less than or equal to 30 can quickly converge incident light, and the high-dispersion material can effectively compensate the chromatic aberration value in an optical system, wherein Nd is the refractive index and Vd is the Abbe constant.
The fourth lens L4 and the fifth lens L5 adopt a cemented design to effectively improve chromatic aberration of the optical system. Thereby being beneficial to improving the light transmission capability and the resolution capability of the whole optical system.
Referring to fig. 2A-2C and fig. 3-4, fig. 2A is a graph of chromatic aberration (also called spherical aberration), which is expressed by the wavelengths of the commonly used red (C), green (D) and blue (F) lights, and has a unit of mm. And 2B is an astigmatic field curve diagram showing the degree of field curvature of an image formed by astigmatism in a fringe projection lens for three-dimensional measurement, expressed by a generally green (D) light in mm, in which the aberration of light rays is present only in the range of-0.025 to 0.025, and the imaging performance is excellent. FIG. 2C is a distortion plot showing the magnitude of distortion at different angles of view, in% for a fringe projection lens for three-dimensional measurements with optical distortion < -3%. Fig. 3 is a graph of MTF values, which shows the magnitude of lens resolution, and MTF values at all spatial frequencies are as high as 80% or more, fig. 4 is an energy diagram of geometric flare circle at different angles of view, which shows the image point brightness of lens imaging, where the angle of view is zero, and the brightness of the image point imaged by the fringe projection lens for three-dimensional measurement is the highest, and the maximum angle of view is 72.45 °.
Referring to fig. 5, a fringe projection lens for three-dimensional measurement according to a second embodiment of the present invention is different from the fringe projection lens for three-dimensional measurement according to the first embodiment in that: the total focal length of the fringe projection lens for three-dimensional measurement provided by the second embodiment is 7.6mm, the TTL value is 79.92mm, and the maximum field angle FOV value is 72.56 °, please refer to tables five, six and seven for specific parameters.
The fifth table is the specification of the fringe projection lens for three-dimensional measurement and the optical parameter table thereof provided in the second embodiment of the present invention.
Table five
ω is 36.28 °, ω is half of the angle of view, and the maximum angle of view FOV is 72.56 ° 2 ω.
Table six relevant parameters are relevant parameters of the fringe projection lens for three-dimensional measurement, such as surface type, radius of curvature, center thickness, semi-clear aperture, refractive index, and abelian constant of each surface of all lenses from object side (OBJ) to image side (IMA).
Table six:
based on the example data above, the relevant data of table seven below was obtained.
Table seven:
| basic parameters | EFL | BFL | TTL | FFL | d | h |
| Numerical value (mm) | 7.6 | 3 | 79.92 | 12.28 | 23.48 | 5.58 |
| Basic parameters | F1 | F2 | F3 | F glue | F6 | F7 |
| Numerical value (mm) | -24.925 | -20.67 | 30.72 | 85.11 | 19.98 | 67.14 |
| Basic parameters | F front | F after | ||||
| Numerical value (mm) | -33.52 | 18.06 |
The focal length of the fringe projection lens used for three-dimensional measurement meets the requirement that TTL/EFL is not less than 8.08 and not more than 10.52, wherein TTL is the distance from the outermost point of the object side of the first lens of the fringe projection lens used for three-dimensional measurement to an imaging surface, and EFL is the total focal length value of the fringe projection lens used for three-dimensional measurement; TTL/FFL is more than or equal to 5.87 and less than or equal to 6.51, wherein FFL is the distance from the outermost point on the image side of the first lens to the imaging surface; TTL is not less than 76.36mm and not more than 79.92mm, and is the distance from the outermost point of the object side of the first lens of the fringe projection lens for three-dimensional measurement to the imaging surface; BFL/EFL is more than or equal to 0.32 and less than or equal to 0.40, wherein BFL is the distance from the outermost point of the seventh lens image side of the fringe projection lens for three-dimensional measurement to the imaging surface; f is more than or equal to 18.06mm and less than or equal to 44.80mm, wherein F is the focal length value of the rear lens group; -1.11 ≦ Fback/Ffront ≦ -0.54, where Ffront represents the focal length value of the front lens group; f glue/F is more than or equal to 2.96 and less than or equal to 4.71, wherein the F glue represents the focal length value of the cemented lens.
Referring to fig. 6A-6C and fig. 7 and 8, the optical performance graph of the second embodiment is shown in fig. 6A, in which the graph of the chromatic aberration (also called spherical aberration graph) is represented by the wavelength of the common red (C), green (D) and blue (F) light, and the unit is mm. And 6B is an astigmatic field curve diagram showing the degree of curvature of field of an image formed by astigmatism by the fringe projection lens for three-dimensional measurement, which is expressed by a commonly used green (D) light in mm. FIG. 6C is a distortion plot showing the magnitude of distortion in% for different angles of view, where the distortion is < -6%. Fig. 7 is a graph of MTF values, which shows that in a size chart of lens resolution, the MTF values at all spatial frequencies are as high as 80% or more, and the optical aberration only exists in a range from-0.025 to 0.025, so that the imaging quality is more excellent. Fig. 8 is an energy diagram of the geometric light spot circle-in under different angles of view, which shows the image point brightness of the lens imaging, wherein the angle of view is zero, the image point brightness of the fringe projection lens imaging for three-dimensional measurement is the highest, and the maximum angle of view is 72.56 °.
According to the invention, by reasonably controlling the focal length distribution among the lenses, the ultra-short focal length compact structure of the fringe projection lens for three-dimensional measurement is realized, TTL is kept to be minimum, the field angle and the projection area are maximized, and at least 40 inches of projection area is arranged at a position with a distance of 1 meter, so that a pair of fringe patterns can cover a large surface as soon as possible, and a system can capture enough object information and realize a high-precision fringe pattern. Particularly consistent with three-dimensional measurements of structured light. The first lens is aspheric surface on the side close to the object side, the seventh lens is aspheric surface on the side close to the image side, and the fringe projection lens for three-dimensional measurement can achieve better aberration correction effect by using less aspheric lenses, and simultaneously saves cost.
Meanwhile, the focal power distribution proportion of the front lens group and the rear lens group is reasonably controlled, so that on one hand, the height of incident light of the front lens group is favorably controlled, and the high-level aberration of an optical system and the outer diameter of a lens are reduced; on the other hand, the emergent angle of the chief ray passing through the rear lens group can be reduced so as to improve the relative brightness of the optical system.
The fringe projection lens for three-dimensional measurement provided by the invention has the advantages of low cost, light weight, small distortion, small size, high light-passing performance and high definition, and can keep lighter weight and lower cost due to the adoption of more plastic aspheric lenses.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting thereof, since any modifications, equivalents and improvements made within the spirit of the invention are intended to be included therein.
Claims (10)
1. A fringe projection lens for three-dimensional measurement projection of structured light, comprising: the lens is composed of a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power in sequence from an object space to an image space;
the front lens group consists of a first lens, a second lens and a third lens from an object side to an image side in sequence;
the first lens is a meniscus lens with negative focal power, and the convex surface faces the object space; the second lens is a biconcave lens having a negative optical power; the third lens is a double-convex lens having a positive optical power;
the rear lens group is composed of a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object space to the image space in sequence;
the fourth lens is a double-convex lens having a positive optical power; the fifth lens is a biconcave lens having a negative optical power; the sixth lens is a double-convex lens having a positive optical power; the seventh lens is a meniscus lens with negative focal power, and the convex surface faces the object space;
the fourth lens and the fifth lens are combined into a cemented lens;
the fringe projection lens for three-dimensional measurement satisfies a conditional expression that TTL is greater than or equal to 76.36mm and less than or equal to 79.92mm, and TTL is the distance from the outermost point of the object side of the first lens of the fringe projection lens for three-dimensional measurement to an imaging surface.
2. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: and the conditional formula 8.08 is more than or equal to TTL/EFL is less than or equal to 10.52, wherein EFL is the total focal length value of the fringe projection lens for three-dimensional measurement.
3. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 2, wherein: the surface of the first lens close to the object side is an aspheric surface, and the surface of the seventh lens close to the image side is an aspheric surface.
4. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: the condition formula 5.87 ≤ TTL/FFL ≤ 6.51 is satisfied, wherein FFL is the distance from the image side outermost point of the first lens to the image plane.
5. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: and the conditional formula of BFL/EFL is more than or equal to 0.32 and less than or equal to 0.40, wherein EFL is the total focal length value of the fringe projection lens for three-dimensional measurement, and BFL is the distance from the outermost point of the seventh lens image side of the fringe projection lens for three-dimensional measurement to an imaging surface.
6. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: and F is less than or equal to 44.80mm after the conditional formula is satisfied, wherein F is less than or equal to 18.06mm, and the F is the focal length value of the rear lens group.
7. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 6, wherein: the conditional formula of-1.11 & lt, F rear/F front & lt, -0.54 is satisfied, wherein F front represents the focal length value of the front lens group.
8. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: the conditional formula 72.45 DEG-FOV 72.56 DEG is satisfied, wherein FOV represents the maximum field angle of the fringe projection lens, and the fringe projection lens for three-dimensional measurement has a projection area of at least 40 inches at a position with a distance of 1 meter.
9. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 8, wherein: the first lens meets the conditional formula that (d/h)/FOV is less than or equal to 0.06, wherein d represents the maximum light transmission aperture of the first lens towards the convex surface of the object space corresponding to the maximum field angle, and h represents the imaging image height corresponding to the maximum field angle.
10. The fringe projection lens assembly for three-dimensional measurement as claimed in claim 1, wherein: the conditional formula is more than or equal to 2.96, F glue/F is less than or equal to 4.71, wherein F glue represents the focal length value of the cemented lens, and F glue represents the focal length value of the rear lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092739.5A CN108132526B (en) | 2016-12-01 | 2016-12-01 | Stripe projection lens for three-dimensional measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092739.5A CN108132526B (en) | 2016-12-01 | 2016-12-01 | Stripe projection lens for three-dimensional measurement |
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| Publication Number | Publication Date |
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| CN108132526A CN108132526A (en) | 2018-06-08 |
| CN108132526B true CN108132526B (en) | 2020-03-10 |
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| CN108873253B (en) * | 2018-07-02 | 2020-02-28 | 浙江舜宇光学有限公司 | Camera lens |
| CN108873270B (en) * | 2018-07-13 | 2024-04-12 | 舜宇光学(中山)有限公司 | Glass-plastic mixed prime lens |
| CN110794556B (en) * | 2019-11-01 | 2021-09-14 | 江西联创电子有限公司 | Wide-angle lens and panoramic camera system |
| CN112817132B (en) * | 2021-04-20 | 2021-07-27 | 江西联创电子有限公司 | Fixed-focus lens and imaging device |
| CN112882207B (en) * | 2021-04-29 | 2021-07-06 | 江西联益光学有限公司 | Optical imaging lens and imaging apparatus |
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| CN206369893U (en) * | 2016-12-01 | 2017-08-01 | 广西师范大学 | A kind of fringe projection camera lens for three-dimensional measurement |
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