CN109946046A - Eccentric testing device and method - Google Patents
Eccentric testing device and method Download PDFInfo
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- CN109946046A CN109946046A CN201711394255.0A CN201711394255A CN109946046A CN 109946046 A CN109946046 A CN 109946046A CN 201711394255 A CN201711394255 A CN 201711394255A CN 109946046 A CN109946046 A CN 109946046A
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Abstract
This application discloses a kind of eccentric testing devices, for measuring the eccentricity value of optical system, which is characterized in that eccentric testing device includes: light source；Target module is located on light source, including at least one target；Rotary module is located on target module and arranges with target modular spacing, and rotary module is configured to keep optical system and optical system is driven to rotate；Camera model is configured to receive transmission light that light source issues, through target module and optical system, forms the target picture of target on camera model through light；And computing module, it is configured to the eccentricity value associated with target of the moving track calculation optical system based on target picture, wherein, rotary module drives optical system to rotate at least one week, computing module determines the motion profile for the target picture that target is formed on camera model, and the moving track calculation eccentricity value based on target picture.Disclosed herein as well is the methods for using eccentric testing device measurement eccentricity value.
Description
Technical field
The application relates generally to optical system detection technical field, more specifically, this application involves eccentric testing device and
Method.
Background technique
Optical system has a symmetry axis, is usually system axle.Each sphere centre is all in system axle, referred to as concentric optical system
System.The purpose of optical design is exactly the aberration for calculating concentric optical system, to meet image quality requirement.But due to optical element and
Machine components have mismachining tolerance, so that after mounting, each sphere centre of optical system is not in system axle, to center occur
Deviation.
The centre deviation of optical system can change intrinsic aberration correction state, change so that aberration generates and picture occur
The problems such as difference deteriorates.For the camera lens of high quality, bad image quality caused by the centre deviation of optical system is that camera lens moves back
One of the main reason for repairing or scrapping.Therefore, it is the quality for guaranteeing camera lens product, needs to carry out corresponding centre deviation to camera lens
Detection.
Currently, have some eccentric testers that can be applied to industrial production or universities and colleges, R&D institution laboratory both at home and abroad,
For example, the OptiCentic equipment of TROPTICS company, Germany production.As shown in Figure 1, the equipment includes oneself with CCD camera
Collimator 1, eyepiece 2, optical system to be measured 3, rotating device 4, mirror surface 5 and parallel light tube 6.The principle of the equipment is as follows:
The collimated light beam issued by parallel light tube 6 through lens focus in the focal plane of lens to be measured, by autocollimator, telescope or
The eyepiece 2 of microscope 1 receives focus picture, rotates optical system 3 to be measured by rotating device 4 to obtain the movement rail of focus picture
Mark utilizes the moving track calculation eccentricity value of focus picture.The equipment needs to put into biggish cost, is not suitable for applying in high-volume
In production.Also, the precision that the equipment utilization is calculated along light path principle is limited.In addition, the equipment can only be in vertical measurement
Heart eccentricity value can not measure the eccentricity value of other angles.
Summary of the invention
The application is intended to provide a kind of bias of at least one above-mentioned defect at least overcoming or partially overcoming the prior art
Test device.
On the one hand, this application provides eccentric testing devices, for measuring the eccentricity value of optical system, which is characterized in that
The eccentric testing device includes:
Light source；
Target module is located on the light source, including at least one target；
Rotary module is located on the target module and arranges with the target modular spacing, and the rotary module is matched
It sets for keeping the optical system and the optical system being driven to rotate；
Camera model is configured to receive that the light source issues, through the target module and the optical system
Through light, the target picture for forming the target on the camera model through light；And
Computing module is being configured to optical system described in the moving track calculation based on the target picture with the target
Associated eccentricity value,
Wherein, the rotary module drives the optical system to rotate at least one week, and the computing module determines the mark
The motion profile for the target picture that target is formed on the camera model, and the moving track calculation institute based on the target picture
State eccentricity value.
On the other hand, this application provides a kind of eccentricity values of measurement optical system based on above-mentioned Accentric detector
Method, this method comprises: optical system is placed on the rotary module of the eccentric testing device；
By the camera model of the eccentric testing device receive the eccentric testing device light source issue, through institute
The target module of eccentric testing device and the transmission light of the optical system are stated, so that the light that penetrates is in the camera model
The upper target picture for forming at least one target for including in the target module；And
Make the rotary module that the optical system be driven to rotate at least one week, and passes through the meter of the eccentric testing device
The motion profile for the target picture that module determines that the target in the target is formed on the camera model is calculated, and is based on
The moving track calculation of the target picture goes out the eccentricity value.
The Accentric detector and method of the application, relative to traditional Accentric detector, eccentric inspection provided by the present application
Survey device have many advantages, such as such as precision it is high, it is at low cost, be not limited to vertical measurement.
Detailed description of the invention
By referring to the detailed description that the following drawings carries out, the above and further advantage of presently filed embodiment will become
It is clear that attached drawing is intended to show that the illustrative embodiments of the application rather than is limited.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the schematic diagram of existing eccentric testing device；
Fig. 2 diagrammatically illustrates the structure chart of the eccentric testing device according to the embodiment of the present application 2；
Fig. 3 diagrammatically illustrates the structure chart that can be used for the rotary module of the application embodiment；
Fig. 4 is diagrammatically illustrated using according to the first of the application embodiment the closing track；
Fig. 5 is diagrammatically illustrated using according to the second of the application embodiment the closing track；
Fig. 6 diagrammatically illustrates the eccentric testing device according to the embodiment of the present application 1.
Specific embodiment
Various aspects of the reference attached drawing to the application are made more detailed description by the application in order to better understand.It answers
Understand, the only description to the illustrative embodiments of the application is described in detail in these, rather than limits the application in any way
Range.In the specification, the identical element of identical reference numbers.Stating "and/or" includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the first, second equal statement is only used for a feature and another feature differentiation
It comes, without indicating any restrictions to feature.Therefore, discussed below without departing substantially from teachings of the present application
First closing track is also known as the second closing track, and similarly, the second closing track is also known as the first closing track.
It should be understood that in this application, when element or layer be described as be in another element or layer "upper", " being connected to " or
When " being attached to " another element or layer, can directly on another element or layer, be connected directly to or be attached to another element or
Layer, or element or layer between may be present.When element is known as " located immediately at " another element or layer "upper", " directly connects
It is connected to " or " being attached directly to " another element or when layer, there is no elements or layer between.In the specification, phase
Same label refers to identical element.As used in this article, term "and/or" includes one in associated listed item
Or multiple any and all combinations.
Terminology used herein is only used for the purpose of description specific embodiment, it is no intended to limit the application.Such as exist
It is used herein, unless clearly dictating in context, packet otherwise is also intended to without limiting the feature of single plural form
Include the feature of plural form.It will also be appreciated that term " comprising ", " including " do not preclude the presence or addition of it is one or more its
Its feature, step, component, assembly unit and/or their combination.In addition, using "available" table when describing presently filed embodiment
Show " one or more embodiments of the application ".Also, term " illustrative " is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein all have with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) it should be interpreted as having and their consistent meanings of meaning in the context of the relevant technologies, and
It will not be explained with idealization or excessively formal sense, unless clear herein so limit.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 2 shows the structural schematic diagrams according to the eccentric testing device of the application embodiment.
It may include light source 6, the mark on light source 6 according to the eccentric testing device in the application illustrative embodiments
Target module 5, the rotary module 4 on target module 5, camera model 10 and computing module (not shown).Camera model 10,
Rotary module 4 and target module 5 are spaced scheduled distance to each other.
Rotary module 4 and 5 arranged for interval of target module.Rotary module 4 is for placing optical system to be measured 3 (for example, mirror
Head), and rotary module 4 can drive optical system 3 to be measured to rotate.Existing any suitable sizing can be used in rotary module 4
Rotating device.
Optionally, rotary module 4 can be the rotating device with structure as shown in Figure 3.Referring to Fig. 3, rotary module 4 can
Including driving wheel 41 and two driven wheels 42 arranged with V-structure.Optical system 3 to be measured is placed on driving wheel and driven wheel
Between V-structure, and clamped by the V-structure of driving wheel 41 and driven wheel 42.In use, transfer member is (for example, skin
Band) drive driving wheel 41 to rotate, the rotation of driving wheel 41 drives the rotation of optical system 3 and driven wheel 42 to be measured.Entirely revolving
Turn during, optical system 3 to be measured remain at be clamped in the state of, so that it is guaranteed that the center of optical system to be measured 3 is not
It shifts, to improve measuring accuracy.Optionally, driving wheel 41 uses colloid flexible material, and driven wheel 42 uses plastic material.
In rotation process, the dynamic friction that driving wheel 41 and driven wheel 42 treat photometry system 3, which can efficiently reduce, treats photometry system
The cosmetic injury of system 3.
Above-mentioned rotating device can clamp optical system to be measured by elastic force and guide rail, can effectively improve centrad and measurement
Accuracy reduces the frictional force in rotary course, prevents plowing from optical system to be measured.
Camera model 10 (in the embodiment of figure 2, including camera 1 and camera 2) can be for CCD (Charge-
Coupled Device, photosensitive coupling element) chip camera, such as industrial camera, CCD camera.Light from light source 6 passes through
Target module 5 is subsequently passed through optical system 3 to be measured and finally target module 5 is imaged on camera model 10.Camera model 10
Receive the target picture that target module 5 is formed by via optical system 3 to be measured.
Target module 5 may include all objects that can be imaged on camera model 10.For example, target module 5 can be
Include but are not limited to spider (as shown in the figure), laser, black patch and circular point shape object etc..Target module 5 may include at least one
A target, for example, target module 5 may include center target a and/or side target b.What center target a was located at optical system is
It unites on axis 3, the extended line of the line of center target a and optical system to be measured 3 passes through camera 1, and thus camera 1 can receive light source
6 transmission light issuing, through center target a and optical system 3, the mark for forming center target a on camera 1 through light
Target image.Similar, the extended line of the line of side target b and optical system to be measured 3 passes through camera 2, and thus camera 2 can receive
Transmission light that light source 6 issues, through side target b and optical system 3, it is described that side target b is formed on camera 2 through light
Target picture.It can be seen that side target b and the system axle of optical system 3 separate.
Computing module can capture target as 7 track.For example, target picture be dot in the case where, using target picture as
Punctiform image is handled；In the case where target picture is spider (as shown in the figure), computing module can capture spider imaging
Central point locus, so that it is determined that the target in target module 5 is formed by the motion profile of target picture on camera model 10.Meter
Calculate module can based on target as 7 moving track calculation eccentricity value associated with target, that is, visual field associated with target
Eccentricity value.For example, center target eccentricity value (eccentricity value of central vision), the side target eccentricity value (bias of visual field on non-axis
Value) etc..The specific determining method of each eccentricity value will be described in detail in each specific embodiment.
The test philosophy of the eccentric testing device of the application is as follows: camera model 10 receive light source 6 issue, through target
The target picture through target in light and the target module 5 of formation of the target of module 5 and optical system to be measured 3, starts rotating mould
Block 4 makes rotary module 4 that optical system 3 to be measured be driven to rotate at least one week, the mark that target module 5 is formed on camera model 10
Target image 7 moves therewith, computing module determine target that target module 5 is formed on camera model 10 as 7 motion profile (example
Such as, referring to fig. 4, Fig. 5), and based on target as 7 the corresponding eccentricity value of moving track calculation.
According to the Accentric detector of the application embodiment, replaced in existing Accentric detector using target module
Parallel light tube, can substantially reduce Accentric detector cost (for example, can reduce about 20%-95%, 40%-90%,
60%-85%, 80% cost).Compared to the conventional detection devices that existing basis is designed along light path principle, the bias of the application
(for example, the measurement accuracy that about can be improved 20%) of measurement accuracy can be improved in detection device.In addition, in Accentric detector
Target module it is position-movable, measured so as to the eccentricity value to all angles, and be no longer only limitted to Vertical Square
To test, it is more flexible in the selection of measurement direction.
The eccentric testing dress suitable for above embodiment is further described referring to the drawings and in conjunction with specific embodiments
The specific embodiment set.
Embodiment 1: the measurement of center target eccentricity value
Fig. 6 diagrammatically illustrates the eccentric testing device according to the embodiment of the present application 1.
As shown in fig. 6, eccentric testing device may include light source 6, the target module 5 with center target, rotary module 4,
Camera model and computing module (not shown) including camera 1.Optical system 3 (for example, camera lens) to be measured is placed in rotary module 4
It goes up and clamps.The center target of target module 5 is located in the system axle of optical system 3, and the center target of target module 5 and to
The extended line of the line of photometry system 3 passes through camera 1.That is, camera 1 is located at optical system 3 to be measured and target module 5
Center target surface, the extended line of the line of the center target and optical system to be measured 3 of target module 5 is perpendicular to camera
1 CCD, so that center target images on the CCD of camera 1.
Inputting the EFL of camera eyepiece when first test in software configuration file, (Effective Focal Length, has
Imitate focal length) value.Start rotating device 4, the driving wheel in rotating device 4 rotates and drives the rotation of optical system 3 at least one to be measured
Week.As optical system 3 to be measured rotates at least one week, center target passes through optical system 3 to be measured institute's shape on the CCD of camera 1
At target picture move therewith, motion profile formed first closing track, for example, as shown in figure 4.At this point, computing module is based on
Distance first closes track centers O on first closing track1Maximum distance R1, center target eccentricity value θ is calculated1=
arctan(R1/ EFL), wherein the first closing track centers O1For the mass center of the first closing track.Acquired results θ1Centered on i.e.
The eccentricity value of visual field.
Embodiment 2: the measurement of side target eccentricity value
Fig. 2 diagrammatically illustrates the eccentric testing device according to the embodiment of the present application 2.
As shown in Fig. 2, eccentric testing device may include light source 6, the target module with center target a and side target b
5, rotary module 4, camera model 10 and computing module (not shown) including camera 1 and camera 2.3 (example of optical system to be measured
Such as, camera lens) it is placed on rotary module 4 and clamps.
The center target a of target module 5 is located in the system axle of optical system 3, and the center target a of target module 5 and
The extended line of the line of optical system 3 to be measured passes through camera 1.That is, camera 1 is located at optical system 3 to be measured and target mould
The extended line of the surface of the center target a of block 5, the line of the center target a and optical system to be measured 3 of target module 5 is vertical
In the CCD of camera 1, so that center target images on the CCD of camera 1.
The side target b of target module 5 and the system axle of optical system 3 separate, and the side target b of target module 5 and
The extended line of the line of optical system 3 to be measured passes through camera 2, that is to say, that camera 2 is located at 3 oblique upper of optical system to be measured, mark
The extended line of the line of the side target b and optical system to be measured 3 of target module 5 perpendicular to camera 2 CCD so that side target b
It images on the CCD of camera 2.
The EFL value of camera eyepiece is inputted when first test in software configuration file.Start rotating device 4, rotating device 4
In driving wheel rotate and optical system 3 to be measured driven to rotate at least one week.As optical system 3 to be measured rotates at least one week,
Center target a and side target b is formed by target picture therewith by optical system 3 to be measured on the CCD of camera 1 and camera 2
Movement, motion profile are respectively formed the first closing track and the second closing track, such as shown in Figure 4, Figure 5 respectively.
At this point, computing module, which is based on distance first on the first closing track, closes track centers O1Maximum distance R1, calculate
Obtain center target eccentricity value θ1=arctan (R1/EFL).Wherein, the first closing track centers O1For the matter of the first closing track
The heart.Acquired results θ1The as eccentricity value of central vision.
Similarly, computing module can also close track centers O based on distance second on the second closing track2Maximum distance
R2, side target eccentricity value θ is calculated2=arctan (R2/EFL).Wherein, the second closing track centers O2For the second closing
The mass center of track.Acquired results θ2The eccentricity value of visual field on as non-axis.
It is described above by reference to illustrative embodiments of the attached drawing to the application.Those skilled in the art should manage
Solution, above embodiment is solely for the purpose of illustration and the example lifted, rather than is used to limit scope of the present application.It is all
Made any modification, equivalent replacement etc., should be included in the application and want under teachings of the present application and claims
In the range of asking protection.
Claims (10)
1. a kind of eccentric testing device, for measuring the eccentricity value of optical system, which is characterized in that the eccentric testing device packet
It includes:
Light source；
Target module is located on the light source, including at least one target；
Rotary module is located on the target module and arranges with the target modular spacing, and the rotary module configuration is used
In the holding optical system and the optical system is driven to rotate；
Camera model is configured to receive transmission that the light source issues, through the target module and the optical system
Light, the target picture for forming the target on the camera model through light；And
Computing module is configured to the related to the target of optical system described in the moving track calculation based on the target picture
The eccentricity value of connection,
Wherein, the rotary module drives the optical system to rotate at least one week, and the computing module determines that the target exists
The motion profile of the target picture formed on the camera model, and described in the moving track calculation based on the target picture partially
Center value.
2. eccentric testing device according to claim 1, which is characterized in that the target includes laser, black patch, spider
With circular point shape object.
3. eccentric testing device according to claim 1, which is characterized in that
At least one described target includes center target, and the center target is located in the system axle of the optical system, and/or
At least one described target includes side target, and the side target and the system axle of the optical system separate.
4. eccentric testing device according to claim 3, which is characterized in that at least one described target includes center mark
Target, when the rotary module drives the optical system to rotate at least one week, the center target is on the camera model
The center target picture of formation moves therewith, and motion profile forms the first closing track, and the computing module is based on described first
Close the maximum distance R of the mass center of the first closing track described in distance on track1Center target eccentricity value θ is calculated according to the following formula1:
θ1=arctan (R1/ EFL), wherein EFL is the effective focal length of the optical system.
5. eccentric testing device according to claim 3, which is characterized in that at least one described target includes lateral marks
Target, when the rotary module drives the optical system to rotate at least one week, the side target is on the camera model
The lateral marks target image of formation moves therewith, and motion profile forms the second closing track, and the computing module is based on described second
Close the maximum distance R of the mass center of the second closing track described in distance on track2Side target eccentricity value θ is calculated according to the following formula2:
θ2=arctan (R2/ EFL), wherein EFL is the effective focal length of the optical system.
6. eccentric testing device according to claim 1, which is characterized in that the camera model includes and described at least one
At least one corresponding camera with photosensitive coupling element chip of a target.
7. eccentric testing device according to claim 1, which is characterized in that the rotary module includes:
Driving wheel；With
With V-structure arrange two driven wheels,
Wherein, the optical system is placed between the driving wheel and the V-structure of the driven wheel, and by the driving wheel
It is clamped with the V-structure of the driven wheel.
8. eccentric testing device according to claim 1, which is characterized in that the driving wheel uses colloid flexible material,
And/or the driven wheel uses plastic material.
9. a kind of method of the eccentricity value using eccentric testing device as described in claim 1 measurement optical system, comprising:
Optical system is placed on the rotary module of the eccentric testing device；
By the camera model of the eccentric testing device receive the eccentric testing device light source issue, through it is described partially
The target module of heart test device and the transmission light of the optical system, so that described penetrate light shape on the camera model
At the target picture at least one target for including in the target module；And
Make the rotary module that the optical system be driven to rotate at least one week, and passes through the calculating mould of the eccentric testing device
Block determines the motion profile for the target picture that the target in the target is formed on the camera model, and based on described
The moving track calculation of target picture goes out the eccentricity value.
10. according to the method described in claim 9, it is characterized in that,
At least one described target includes center target, and the center target is located in the system axle of the optical system, and
Wherein, the step of moving track calculation based on the target picture goes out the eccentricity value include:
Make the rotary module that the optical system be driven to rotate at least one week, center target shape on the camera model
At center target picture move therewith, motion profile formed first closing track；And
The maximum distance R of mass center based on the first closing track described in distance on first closing track1In calculating according to the following formula
Heart target eccentricity value θ1:
θ1=arctan (R1/ EFL), wherein EFL is the effective focal length of the optical system；And/or
At least one described target includes side target, and the side target and the system axle of the optical system separate, and
Wherein, the step of moving track calculation based on the target picture goes out the eccentricity value include:
The rotary module drives the optical system to rotate at least one week, and the side target is formed on the camera model
Lateral marks target image move therewith, motion profile formed second closing track；And
The maximum distance R of mass center based on the second closing track described in distance on second closing track2Calculation side according to the following formula
Face target eccentricity value θ2:
θ2=arctan (R2/ EFL), wherein EFL is the effective focal length of the optical system.
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| CN112504658A (en) * | 2021-02-04 | 2021-03-16 | 南京航空航天大学 | Axle center track testing system and method based on Doppler laser range finder |
| CN113588215A (en) * | 2021-07-30 | 2021-11-02 | 南京恒一光电有限公司 | Optical lens detects uses eccentric appearance |
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| YUNG-HSIANG CHEN 等: "An_image_based_optical_lens_eccentric_error_inspection_system", 《2012 IEEE INTERNATIONAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE PROCEEDINGS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504658A (en) * | 2021-02-04 | 2021-03-16 | 南京航空航天大学 | Axle center track testing system and method based on Doppler laser range finder |
| CN113588215A (en) * | 2021-07-30 | 2021-11-02 | 南京恒一光电有限公司 | Optical lens detects uses eccentric appearance |
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