CN109764817A - Contactless lens centre thickness measuring system and method - Google Patents
Contactless lens centre thickness measuring system and method Download PDFInfo
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- CN109764817A CN109764817A CN201910031967.9A CN201910031967A CN109764817A CN 109764817 A CN109764817 A CN 109764817A CN 201910031967 A CN201910031967 A CN 201910031967A CN 109764817 A CN109764817 A CN 109764817A
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Abstract
The present invention provides a kind of contactless lens centre thickness measuring system, comprising: probe, host computer, exemplar clamping device, Z axis motorized precision translation stage module, electronic control module and probe support structure.The present invention also provides a kind of contactless lens centre method for measuring thickness, Z axis motorized precision translation stage module drives lens to be measured mobile, often move a certain distance the reflected image of subject lattice array, host computer calculates the size of object point image in real time, it records the corresponding conjugate planes location information of each object point and is fitted the face shape obtained at lens surface center, the distance for further calculating two surface vertices obtains lens centre thickness.Have the advantages that non-contacting, avoids and measure influence to lens surface quality, while overcoming lens and inclined influence is installed, improve measurement efficiency.
Description
Technical field
The invention belongs to field of optical measuring technologies more particularly to a kind of contactless lens centre thickness measuring system and sides
Method.
Background technique
The controllable ray trajectory of optical lens, is widely used in various optical systems.Lens centre thickness is to influence lens
The important parameter of machining accuracy, mismachining tolerance may cause the focal length of lens variation so that cause the practical optical parameter of system with
Design parameter is not inconsistent, and reduces optical property.High performance optical systems product has strict requirements to lens centre thickness tolerance, because
It is essential link that this, which carries out high-precision detection to lens centre thickness after processing is completed,.
Currently, contact type measurement mode is to be contacted simultaneously using probe with lens surface in the thickness measurement method of lens centre
Mobile probe obtains the face shape information on surface by the position of probe indirectly, but probe be easy to cause surface scratch and in movement
Probe is easily worn in the process, reduces measurement accuracy.In order to solve the above technical problems, those skilled in the art propose non-connect
Touch measurement method, non-contact measurement mode include: image method, coplanar appearance method, confocal method, interferometry etc., are current centers
The developing direction of thickness measurement has the advantages that accurate not injured surface.The patent of Publication No. CN104154869A discloses one
Kind of white light interference lens center thickness measuring system and method, have the advantages that measurement accurately, high resolution, but its cost compared with
It is high, it is difficult to be widely applied.The patent of Publication No. CN102435146 discloses a kind of thick based on confocal method measurement lens centre
Device, device is complicated, higher cost, measures cumbersome.
Therefore, the non-contact measurement mode of current optical lens center thickness has complicated device, higher cost and survey
Cumbersome technical problem is measured, is not popularized yet in common optics factory.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of contactless lens centre thickness measuring system and method.
In order to which some aspects of the embodiment to disclosure have a basic understanding, simple summary is shown below.It should
Summarized section is not extensive overview, nor to determine key/critical component or describe the protection scope of these embodiments.
Its sole purpose is that some concepts are presented with simple form, in this, as the preamble of following detailed description.
The present invention adopts the following technical scheme:
In some alternative embodiments, a kind of contactless lens centre thickness measuring system is provided, comprising: probe and on
Position machine；
Probe, for projecting object point array to the upper surface and the lower surface of lens to be measured, and it is every in the lens to be measured
Move a certain distance the reflected image of rear subject lattice array；
Host computer, comprising:
Image processing unit, the object point size in reflected image for calculating object point array；
Face shape computing unit, for working as the corresponding conjugate planes location information of each object point of object point size most hour record simultaneously
Fitting, to obtain the face shape at lens surface center；
Testing result output unit, for calculating the distance of two surface vertices according to the face shape at lens surface center,
To obtain lens centre thickness numerical value.
In some alternative embodiments, the probe quantity is two, is located at upper and lower the two of the lens to be measured
Side；The probe includes: spectroscope, microcobjective, detector and object point array generation device, the object point array generation device
The object point array light path of generation is successively projected in the surface of the lens to be measured after the spectroscope, microcobjective, described
The reflected image of detector subject lattice array.
In some alternative embodiments, the contactless lens centre thickness measuring system, further includes: exemplar clamping
Device and Z axis motorized precision translation stage module, the lens to be measured are clamped on the exemplar clamping device, and the Z axis is electronic flat
Moving stage module is for driving the exemplar clamping device mobile, so that the lens to be measured are moved between two probes
It is dynamic.
In some alternative embodiments, the Z axis motorized precision translation stage module includes: location measurement unit and translation stage,
The exemplar clamping device is arranged on the translation stage, and the location measurement unit is used to measure the position of the translation stage.
In some alternative embodiments, the contactless lens centre thickness measuring system, further includes: electronic control
Module；The electronic control module includes: microprocessor and electric-motor drive unit；The microprocessor, it is described for receiving
The instruction of position machine, is acted by the motor that the electric-motor drive unit controls the Z axis motorized precision translation stage module, and real
When read the position data that the location measurement unit measures.
In some alternative embodiments, the object point array generation device is liquid crystal display.
In some alternative embodiments, the object point array generation device is array of orifices or microlens array；It is described
Probe further include: lighting source, the light source that the lighting source generates are generated through the array of orifices or the microlens array
Object point array light path is simultaneously radiated on the spectroscope.
In some alternative embodiments, the electronic control module further include: illumination driving unit；The microprocessor
The on-off of the lighting source is controlled by the illumination driving unit.
In some alternative embodiments, the host computer further include: image acquisition units, for obtaining the probe
The reflected image of the object point array of biography.
In some alternative embodiments, the present invention also provides a kind of contactless lens centre method for measuring thickness, comprising:
It pops one's head in and projects object point array to the upper surface and the lower surface of lens to be measured, and in the every movement one of lens to be measured
The reflected image of subject lattice array after set a distance；
It is described to pop one's head in the object point array reflected image of the lens upper surface to be measured of shooting and the object point array of lower surface
Reflected image is uploaded to host computer；
The host computer calculates the size of object point in the reflected image of object point array in real time；
When object point size minimum, the host computer records conjugate planes location information corresponding to each object point and intends
It closes, to obtain the face shape at lens surface center；
The host computer calculates the distance of two surface vertices according to the face shape at lens surface center, to obtain in lens
Heart thickness numerical value.
Brought by of the invention the utility model has the advantages that the present invention is based on the depth information of optics confocal technology measurement lens surface,
To calculate lens centre thickness, has the advantages that non-contacting compared to the measurement of existing sonde method, can be avoided the damage to lens surface；
The present invention, which overcomes conventional confocal technology by way of directly projecting object point array and only projects single luminous point, causes efficiency lower
The problem of, it can be fitted without mobile object point and obtain face shape at lens surface center；The present invention passes through fitting lens surface center
The mode of place face shape can get the angle of lens tilt, reduce the requirement to lens installation accuracy；Structure is simple, at low cost
Honest and clean, mode of operation is simple, while can guarantee the accuracy of measurement.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of contactless lens centre thickness measuring system of the present invention；
Fig. 2 is a kind of module diagram of contactless lens centre thickness measuring system of the present invention；
Fig. 3 is structural schematic diagram of the present invention probe in a kind of wherein embodiment；
Fig. 4 is the structural schematic diagram of present invention probe in another embodiment.
Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.
As illustrated in fig. 1 and 2, in some illustrative embodiments, it is thick to provide a kind of contactless lens centre by the present invention
Measuring system, comprising: probe 1, host computer 2, exemplar clamping device 3, Z axis motorized precision translation stage module 4, electronic control module 5 and
Probe support structure 6.
1 quantity of popping one's head in is two, respectively upper surface probe 11 and lower surface probe 12, is located at lens 7 to be measured
Upper and lower two sides.Upper surface probe 11 is used to project object point array to the upper surface of lens 7 to be measured, and in the every shifting of lens 7 to be measured
The reflected image of subject lattice array after dynamic certain distance；Lower surface probe 12 is for projecting object to the lower surface of lens 7 to be measured
Lattice array, and after lens 7 to be measured often move a certain distance subject lattice array reflected image.Wherein, lens 7 to be measured are every
The distance of Duan Yidong is preset according to measurement situation.
Host computer 2 includes: that image acquisition units 21, image processing unit 22, face shape computing unit 23 and testing result are defeated
Unit 24 out.
Image acquisition units 21, for obtaining the reflected image for the object point array that probe 1 uploads, host computer 2 by USB or
The reflected image of person's gigabit network interface acquisition object point array.
Image processing unit 22, the object point size in reflected image for calculating object point array.Wherein, object point size
Calculation is currently used image processing techniques, uses a given threshold value binary image first, then uses connected domain
Technology divides different luminous points, finally calculates number of pixels shared by each luminous point as its object point size.
Face shape computing unit 23, for working as the corresponding conjugate planes location information of each object point of object point size most hour record
And be fitted, to obtain the face shape at lens surface center, show that lens surface and detection plane are conjugated when object point size minimum.
The judgment mode that object point size reaches minimum value is to calculate each object after lens 7 to be measured move a certain distance
The size of point, object point size of the lens 7 more to be measured in different location can judge whether object point size reaches minimum
Value.
When moving up and down lens 7 to be measured, if object point is located at 7 surface of lens to be measured and the object point size measured is minimum, this
When recording object point size minimum probe 1 upper and lower position, that is, reacted the fluctuating on 7 surface of lens to be measured, that is to say conjugation
Plan position information.
7 surface of lens to be measured is the face shape of consecutive variations, but object point Limited Number, is determined by the quantity of array, in order to anti-
The face shape for answering consecutive variations needs to be fitted the specific face shape expression formula of acquisition by finite point.Since lens surface is spherical surface, because
It can get the radius and the centre of sphere of face shape after this fitting.Wherein, fitting uses least square method, is the prior art, no longer superfluous here
It states.
Detection plane refers to the surface of the detector 15 of probe 1, when 7 surface of lens to be measured is in focus state, object point
Size is minimum, is conjugated on the superficial theory of detector 15 with lens surface.
Testing result output unit 24, for according to the face shape at lens surface center calculate two surface vertices away from
From to obtain lens centre thickness numerical value.
The quantity of probe support structure 6 is two, and upper surface probe 11 is separately positioned on two spies with lower surface probe 12
On head supporting structure 6,6 pairs of probe support structure probes 1 are adjusted, and upper surface probe 11 and lower surface are adjusted when convenient for assembly
Probe 12, so that the optical axis approximation of the two is overlapped.
Lens 7 to be measured are clamped on exemplar clamping device 3, and Z axis motorized precision translation stage module 4 drives exemplar clamping device 3
It is mobile, so that lens to be measured 7 are moved between upper surface probe 11 and lower surface probe 12.Exemplar clamping device 3
Using self-centering fixture, different radii and different-thickness lens can be clamped, Z axis motorized precision translation stage module 4 drives lens 7 to be measured to move
It is dynamic, often move a certain distance the reflected image of 1 subject lattice array of probe.
Z axis motorized precision translation stage module 4 includes: stepper motor 41, location measurement unit 42 and the translation stage 43 of strap brake, sample
Part clamping device 3 is arranged on translation stage, and location measurement unit is used to measure the position of translation stage.Translation stage drives lens to be measured
7 move up and down, and movement resolution is higher than 1 μm.Location measurement unit uses grating scale or micrometer, and it is mobile to can measure translation stage
Relative distance, Measurement Resolution be higher than 1 μm, precision be higher than 2 μm.
Electronic control module 5 includes: microprocessor 51, electric-motor drive unit 52 and power supply unit 53.Electric-motor drive unit
52 use light-coupled isolation microprocessor and motor driver, and it is defeated to convert 24V level for the Transistor-Transistor Logic level that microprocessor 51 generates
Out, the motor of Z axis motorized precision translation stage module 4 is driven to be operated.Power supply unit 53 be used for by 220V alternating current be converted to 24V and
Each unit in 5V direct-current power supply electronic control module 5.
Microprocessor 51 is used to receive the instruction of host computer 2, controls Z axis motorized precision translation stage mould by electric-motor drive unit 52
The motor of block 4 is acted, and drives lens 7 to be measured to be moved between two probes, the real-time reading position of microprocessor 51
The position data that measuring unit is measured controls the electricity of Z axis motorized precision translation stage module 4 after lens 7 to be measured move a certain distance
Machine stopping movement, probe 1 starts to shoot at this time, and after the completion of shooting, microprocessor 51 controls the electricity of Z axis motorized precision translation stage module 4
Machine continues to act.
As shown in Figures 3 and 4, probe 1 includes: spectroscope 13, microcobjective 14, detector 15 and object point array generation device
16, object point array generation device 16 generate object point array light path be successively projected in after spectroscope 13, microcobjective 14 to
Survey the surface of lens 7, the reflected image of 15 subject lattice array of detector.Detector 15 selects camera, and camera is industrial camera
Perhaps USB universal camera shooting head the former have USB or gigabit network interface, using customization drive software, the latter use Universal USB
Driving.
As shown in figure 3, in some illustrative embodiments, object point array generation device 16 is liquid crystal display, liquid crystal display is straight
It connects and shows object point array, object point array light path is on being projected in probe 1.
As shown in figure 4, in some illustrative embodiments, object point array generation device 16 is array of orifices or lenticule
Array, array of orifices or microlens array need to cooperate with lighting source 17.Probe 1 further include: lighting source 17, lighting source 17
The light source of generation is through array of orifices or microlens array generation lattice array optical path and is radiated on spectroscope 13.Use micro- object
Mirror 14 projects object point battle array and is overlapped lighting source 17 and detection optical path by spectroscope 13, guarantees object point array and detection plane
Conjugation.
Electronic control module 5 further include: illumination driving unit 54；Microprocessor 51 is shone by the illumination control of driving unit 54
The on-off in Mingguang City source 17.Power supply unit 53 is used to be converted in 220V alternating current 24V and 5V direct-current power supply electronic control mould
Each unit in block 5, wherein 24V power supply motor, 5V power supply microprocessor 51, electric-motor drive unit 52 and illumination are driven
Moving cell 54.
Wherein, lens 7 to be measured have circular aperture and are rotational symmetry curved surface, can not be free form surface.
In some illustrative embodiments, the present invention also provides a kind of contactless lens centre method for measuring thickness, packets
It includes:
S1: it pops one's head in and projects object point array to the upper surface and the lower surface of lens to be measured, and in lens travel to be measured
The reflected image of middle captured in real-time object point array.
S2: probe is anti-by the object point array of the object point array reflected image of the lens upper surface to be measured of shooting and lower surface
It penetrates image and is uploaded to host computer.
S3: the host computer calculates the size of object point in the reflected image of object point array in real time.
Wherein, the calculation of object point size is currently used image processing techniques, uses a given threshold value two first
Then value image divides different luminous points using connection field technique, finally calculate the work of number of pixels shared by each luminous point
For its object point size.
S4: when object point size minimum, the host computer records conjugate planes location information corresponding to each object point simultaneously
Fitting, to obtain the face shape at lens surface center.
The judgment mode that object point size reaches minimum value is to calculate each object point after lens to be measured move a certain distance
Size, object point size of the lens 7 more to be measured in different location can judge whether object point size reaches minimum value.
When moving up and down lens to be measured, if object point is located at lens surface to be measured and the object point size measured is minimum, at this time
The upper and lower position popped one's head in when recording object point size minimum, that is, reacted the fluctuating of lens surface to be measured, that is to say conjugate planes
Location information.
Lens surface to be measured is the face shape of consecutive variations, but object point Limited Number, is determined by the quantity of array, in order to react
The face shape of consecutive variations needs to be fitted the specific face shape expression formula of acquisition by finite point.Since lens surface is spherical surface,
It can get the radius and the centre of sphere of face shape after fitting.Wherein, fitting uses least square method, is the prior art, which is not described herein again.
Detection plane refers to the surface of the detector of probe, when lens surface to be measured is in focus state, object point size
Minimum is conjugated on the superficial theory of detector with lens surface.
S5: the host computer calculates the distance of two surface vertices according to the face shape at lens surface center, saturating to obtain
Mirror center thickness numerical value.
It should also be appreciated by one skilled in the art that various illustrative logical boxs, mould in conjunction with the embodiments herein description
Electronic hardware, computer software or combinations thereof may be implemented into block, circuit and algorithm steps.In order to clearly demonstrate hardware and
Interchangeability between software surrounds its function to various illustrative components, frame, module, circuit and step above and carries out
It is generally described.Hardware is implemented as this function and is also implemented as software, depends on specific application and to entire
The design constraint that system is applied.Those skilled in the art can be directed to each specific application, be realized in a manner of flexible
Described function, still, this realization decision should not be construed as a departure from the scope of protection of this disclosure.
Claims (10)
1. contactless lens centre thickness measuring system characterized by comprising probe and host computer；
Probe, for projecting object point array to the upper surface and the lower surface of lens to be measured, and in the every movement of lens to be measured
The reflected image of subject lattice array after certain distance；
Host computer, comprising:
Image processing unit, the object point size in reflected image for calculating object point array；
Face shape computing unit, for working as the corresponding conjugate planes location information of each object point of object point size most hour record and intending
It closes, to obtain the face shape at lens surface center；
Testing result output unit, for calculating the distance of two surface vertices according to the face shape at lens surface center, to obtain
Obtain lens centre thickness numerical value.
2. contactless lens centre thickness measuring system according to claim 1, which is characterized in that the probe quantity is
Two, it is located at the upper and lower two sides of the lens to be measured；
The probe includes: spectroscope, microcobjective, detector and object point array generation device, and the object point array generates dress
The object point array light path for setting generation is successively projected in the surface of the lens to be measured, institute after the spectroscope, microcobjective
State the reflected image of detector subject lattice array.
3. contactless lens centre thickness measuring system according to claim 2, which is characterized in that further include: exemplar folder
Device and Z axis motorized precision translation stage module are held, the lens to be measured are clamped on the exemplar clamping device, and the Z axis is electronic
Translation stage module is for driving the exemplar clamping device mobile, so that the lens to be measured carry out between two probes
It is mobile.
4. contactless lens centre thickness measuring system according to claim 3, which is characterized in that the Z axis is electronic flat
Moving stage module includes: location measurement unit and translation stage, and the exemplar clamping device is arranged on the translation stage, the position
Measuring unit is used to measure the position of the translation stage.
5. contactless lens centre thickness measuring system according to claim 4, which is characterized in that further include: electronics control
Molding block；The electronic control module includes: microprocessor and electric-motor drive unit；
It is electronic to control the Z axis by the electric-motor drive unit for receiving the instruction of the host computer for the microprocessor
The motor of translation stage module is acted, and reads the position data that the location measurement unit is measured in real time.
6. contactless lens centre thickness measuring system according to claim 5, which is characterized in that the object point array produces
Generating apparatus is liquid crystal display.
7. contactless lens centre thickness measuring system according to claim 5, which is characterized in that the object point array produces
Generating apparatus is array of orifices or microlens array；The probe further include: lighting source, the light source warp that the lighting source generates
The array of orifices or the microlens array generation lattice array optical path are simultaneously radiated on the spectroscope.
8. contactless lens centre thickness measuring system according to claim 7, which is characterized in that the electronic control mould
Block further include: illumination driving unit；The microprocessor controls the on-off of the lighting source by the illumination driving unit.
9. contactless lens centre thickness measuring system according to claim 8, which is characterized in that the host computer also wraps
It includes: image acquisition units, for obtaining the reflected image for the object point array that the probe uploads.
10. contactless lens centre method for measuring thickness characterized by comprising
It pops one's head in and projects object point array to the upper surface and the lower surface of lens to be measured, and in every one spacing of movement of lens to be measured
Reflected image from rear subject lattice array；
The probe reflects the object point array reflected image of the lens upper surface to be measured of shooting and the object point array of lower surface
Image is uploaded to host computer；
The host computer calculates the size of object point in the reflected image of object point array in real time；
When object point size minimum, the host computer records conjugate planes location information corresponding to each object point and is fitted, with
Obtain the face shape at lens surface center；
The host computer calculates the distance of two surface vertices according to the face shape at lens surface center, to obtain lens centre thickness
Numerical value.
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| CN111272085A (en) * | 2020-03-13 | 2020-06-12 | 南京理工大学 | Automatic detection device and method for center thickness of optical part |
| CN113029033A (en) * | 2021-03-29 | 2021-06-25 | 中国计量大学 | Microscopic surface measuring device and measuring method |
| CN113639968A (en) * | 2021-08-09 | 2021-11-12 | 南京森林警察学院 | Lens parameter measuring method based on focal depth continuation astigmatism probe |
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