CN208953254U - A kind of lens detecting device - Google Patents
A kind of lens detecting device Download PDFInfo
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- CN208953254U CN208953254U CN201821786622.1U CN201821786622U CN208953254U CN 208953254 U CN208953254 U CN 208953254U CN 201821786622 U CN201821786622 U CN 201821786622U CN 208953254 U CN208953254 U CN 208953254U
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Abstract
The utility model discloses a kind of lens detecting devices, including parallel light tube, measuring unit, objective table and yoke assembly；Objective table is for carrying camera lens to be detected；Parallel light tube is for providing point light source, and the light beam for issuing point light source is parallel to the optical axis outgoing of parallel light tube, couples camera lens to be detected for collimated light beam；Measuring unit is for receiving the light from camera lens to be detected；Yoke assembly is connect with parallel light tube, for driving parallel light tube to rotate around the optical centre of camera lens to be detected.The utility model can measure point light source under visual angle in the disperse spot diameter in lens imaging face to be detected, and then more accurately evaluate the parsing power of camera lens, while operate convenient, be not necessarily to repeated removal, installation and debugging, improve detection efficiency.
Description
Technical field
The utility model embodiment is related to optical lens detection field more particularly to a kind of lens detecting device.
Background technique
As optics industry is increasingly developed, camera lens requires increasingly high-precision in production field, and the quality requirements of product are also increasingly
Strictly, requirement of the client to the parsing power of camera lens is increasingly stringent.Usually pass through the disperse spot diameter of detection point light source, Indirect evaluation
The parsing power of camera lens.Since there are certain primary aberrations for camera lens, so what is obtained on being ultimately imaged face is not the circle of standard
Type hot spot, but a hot spot with irregular shape, referred to as disc of confusion.
In the measurement process to disperse spot diameter, it usually needs test the disperse spot diameter under multiple visual angles.It is existing
After detection device completes detection under a certain visual angle, needs to dismantle corresponding fixture, reinstalled after adjustment angle, or more
Corresponding detection part is arranged in a view directions.
Existing detection device disassembly, installation and debugging process are complicated, and detection efficiency is low, or can only test several specific
Disperse spot diameter under visual angle, final testing result precision are low.
Utility model content
The utility model provides a kind of lens detecting device, to reduce device disassembly, installation and debugging in detection process
Auxiliary degree improves detection efficiency and detection accuracy.
In a first aspect, the utility model embodiment provides a kind of lens detecting device, including parallel light tube, measurement list
Member, objective table and yoke assembly；
Objective table is for carrying camera lens to be detected；
Parallel light tube is for providing point light source, and the light beam for issuing point light source is parallel to the optical axis outgoing of parallel light tube,
Camera lens to be detected is couple by collimated light beam；Measuring unit is for receiving the light from camera lens to be detected；
Yoke assembly is connect with parallel light tube, for driving parallel light tube to rotate around the optical centre of camera lens to be detected.
Optionally, yoke assembly includes deflection arm, and deflection arm one end connects parallel light tube, and the other end is movable to be connected to mirror
On the frame of head detection device.
Optionally, parallel light tube includes light source, star tester and the first lens；Light source, star tester and the first lens are along parallel
The optical axis of light pipe is set gradually；
Light source is for providing required light；Star tester is equipped with spot hole, and for simulating point light source, spot hole is located at the first lens
Focal position.
Optionally, the diameter d of spot hole0Meet following formula:
Wherein, λ is the wavelength of incident light, fcFor the focal length of first lens, n1For image space refractive index, D0For to
The diameter of detector lens.
Optionally, parallel light tube further includes equal tabula rasa, and equal tabula rasa is set between light source and star tester.
Optionally, measuring unit includes the second lens and ccd detector, and the second lens come from camera lens to be detected for receiving
Light, and couple it to ccd detector.
Optionally, measuring unit further includes that moving assembly, the second lens and ccd detector are connected by lens barrel and moving assembly
It connects, moving assembly is mobile for driving the second lens and ccd detector.
Optionally, moving assembly includes first movement component and the second moving parts, and the second lens pass through with ccd detector
Lens barrel is connect with first movement component, first movement component and the movable connection of the second moving parts, the second moving parts
It is flexibly connected with the pedestal of lens detecting device；First movement component can be moved along the optical axis direction of the second lens, and second is mobile
Component can translate in base plane, and base plane is vertical with the optical axis of the second lens.
Optionally, through-hole compatible with camera lens to be detected is offered on objective table, lens fixing to be detected is in through-hole.
Optionally, objective table bottom is provided with plate glass.
Lens detecting device provided by the embodiment of the utility model, yoke assembly are connect with parallel light tube, pass through deflection group
Part drives parallel light tube around lens optical center rotating to be detected, can measure under visual angle point light source camera lens to be detected at
The disperse spot diameter of image planes, and then more accurately evaluate the parsing power of camera lens, at the same operate it is convenient, without repeated removal, installation
And debugging, improve detection efficiency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of lens detecting device provided by the utility model；
Fig. 2 is the enlarged drawing of a-quadrant in Fig. 1；
Fig. 3 is the flow chart for the shot detection processes that utility model embodiment provides；
Fig. 4 is the schematic diagram of the utility model analogue zero visual field working method；
Fig. 5 is the schematic diagram that the utility model simulates peripheral field working method；
Fig. 6 is the schematic diagram of internal structure of parallel light tube in the utility model.
Specific embodiment
The technical issues of to solve the utility model, the technical solution of use and the technical effect that reaches are clearer,
It is described in further detail below in conjunction with technical solution of the attached drawing to the utility model embodiment, it is clear that described reality
Applying example is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention,
It is practical new to belong to this for those skilled in the art's every other embodiment obtained without creative efforts
The range of type protection.
In the description of the present invention, unless otherwise clearly defined and limited, term " connected ", " connection ", " Gu
It is fixed " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it
"lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to
Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above "
One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special
Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only
Indicate that first feature horizontal height is less than second feature.
The utility model embodiment provides a kind of lens detecting device, and the detection device is for detecting point light source to be checked
The disperse spot diameter of camera lens image planes is surveyed, further to evaluate the parsing power of camera lens to be detected.Fig. 1 is provided by the utility model one
The structural schematic diagram of kind lens detecting device, Fig. 2 is the enlarged drawing of a-quadrant in Fig. 1, as shown in Figure 1, the detection device includes flat
Row light pipe 100, measuring unit 200, objective table 300 and yoke assembly.Wherein, objective table 300 is for carrying camera lens to be detected
500,300 destressing al alloy disk of objective table.Through-hole compatible with 500 size of camera lens to be detected is offered on objective table 300,
In detection process, camera lens 500 to be detected is coaxially placed in the through-hole with through-hole, and the diameter of the through-hole can ensure to be detected
Camera lens is not fallen out, while being blocked as far as possible to optical path in detection process, can usually be set the diameter of the through-hole to than to be checked
Survey the size of the small 0.01mm of diameter of camera lens 500.
For providing point light source, the light from point light source is made parallel light tube 100 by the object lens inside parallel light tube 100
The optical axis 101 that the light beam that point light source issues is parallel to parallel light tube 100 is emitted, and couples camera lens 500 to be detected for collimated light beam.
After parallel light tube 100, the optical axis direction along camera lens 500 to be detected is irradiated on camera lens 500 to be detected the light that point light source issues,
Measuring unit 200 obtains point light source in the imaging of 500 image planes of camera lens to be detected for receiving the light from mirror 500 to be detected.By
In camera lens, there are certain primary aberrations, so the round hot spot of the picture not instead of standard obtained on being ultimately imaged face, one
A hot spot with irregular shape, referred to as disc of confusion.Measuring unit 200 can be optical measurement microscope, be surveyed by optics
It measures microscopical microcobjective to amplify the picture of 500 image planes of camera lens to be detected, and the diameter of the picture after measuring and amplifying, last basis
The diameter and system parameter of the picture measured calculate the diameter of image planes disc of confusion, specifically, can be calculated by following formula:
Wherein, d1For the diameter of camera lens image planes disc of confusion to be detected, D is the disperse spot diameter that optical measurement microscope measures
Measured value, k be the microscopical microcobjective of optical measurement enlargement ratio, fbFor the focal length of camera lens to be detected, fcFor directional light
The focal length of the object lens of pipe, d0For the diameter of point light source.
Yoke assembly is connect with parallel light tube 100, for driving parallel light tube 100 in the optics of camera lens 500 to be detected
Heart rotation.Illustratively, in the utility model wherein an embodiment, yoke assembly drives parallel light tube 100 with mirror to be detected
First 500 optical centre is rotation center, and in YOZ plane internal rotation, maximum deflection angle can be ± 90 °.In this way, detecting
Cheng Zhong only needs yoke assembly driving parallel light tube 100 to turn to required angle and fixation, can be detected the disperse under the angle
Spot diameter can test the disperse spot diameter under visual angle, without dismantling, installing and debugging again, improve detection efficiency
And detection accuracy.
Specific parsing power evaluation principle is as follows:
The optical system of remaining three-level spherical aberration, the approximation relation of wave aberration ω and lateral aberration δ are only existed for one
It can be represented by the formula:
U in formula is the angle of rim ray and optical axis.If considering using lateral aberration δ as the half of disperse circular diameter d,
The then general relationship of blur circle and wave aberration are as follows:
Finally by formula (3) it can be concluded that wave aberration ω, and find out the root-mean-square value (RMS value) of wave aberration ω, contrast standard
The deviation of value can determine whether camera lens to be detected meets the requirements.
Fig. 3 is the flow chart for the shot detection processes that utility model embodiment provides, as shown in figure 3, specific detection process
It is as follows:
According to the design wave aberration of camera lens, and current processing technology and imaging requirements are combined, provides one and allow
Wave aberration range, using the RMS value of this wave aberration as judgment criteria.
Firstly, carry out the adjustment of light shaft coaxle degree, make the objective lens optical axis of measuring unit 200, the optical axis of camera lens to be detected 500 and
The optical axis coincidence of parallel light tube 100 meets certain threshold value.
Then first step detection is carried out, by 100 face of parallel light tube camera lens 500 to be detected, with analogue zero visual field work side
Formula.Fig. 4 is the schematic diagram of the utility model analogue zero visual field working method, as shown in figure 4, the optical axis and Z axis of parallel light tube 100
In parallel, measuring unit 200 measures the diameter of disc of confusion.
Then, after first step detection, parallel light tube 100 is rotated into half of field angle around rotation center, simulates peripheral field
Working method.Fig. 5 is the schematic diagram that the utility model simulates peripheral field working method, as shown in figure 5, the angle at edge visual angle
For θ, the disperse spot diameter under peripheral field is at this time measured by measuring unit 200.
Finally, carrying out symmetrical detection by boundary of the optical axis of camera lens 500 to be detected, measured by measuring unit 200 on side
Disperse spot diameter under edge visual field.
The detection first step can compare diffraction limit principle, i.e., (general according to the concentration degree in Airy range self-energy
Think that energy accounting in Airy 83% is diffraction limit) tentatively judged.
Wave aberration root mean square is calculated by software according to the disperse spot diameter measured, to compare wave aberration initially set
RMS standard value, judge whether it qualified.If qualified, software interface shows PASS, if unqualified, software interface shows NG,
And examining report is generated, to analyze underproof reason, and terminate detection process.
Lens detecting device provided by the embodiment of the utility model, yoke assembly are connect with parallel light tube, pass through deflection group
Part drives parallel light tube around lens optical center rotating to be detected, can measure under visual angle point light source camera lens to be detected at
The disperse spot diameter of image planes, and then more accurately evaluate the parsing power of camera lens, at the same operate it is convenient, without repeated removal, installation
And debugging, improve detection efficiency.
Optionally, as shown in Figure 1, yoke assembly includes deflection arm 400,400 one end of deflection arm connects parallel light tube 100,
On the movable frame 11 for being connected to lens detecting device of the other end.Specifically, one end of deflection arm 400 is equipped with a lantern ring, put down
Row light pipe 100 is sheathed in the lantern ring, and optionally, parallel light tube 100 is movable to be sheathed in the lantern ring, can be according to mirror to be detected
First 500 parameter adjusts parallel light tube 100 at a distance from camera lens 500 to be detected.The movable connection of the other end of deflection arm 400
On the frame 11 of lens detecting device, deflection arm 400 can be around fixed point in YOZ plane internal rotation.
Fig. 6 is the schematic diagram of internal structure of parallel light tube in the utility model, optionally, as shown in fig. 6, parallel light tube packet
Include light source 101, star tester 102 and the first lens 103, wherein light source 101, star tester 102 and the first lens 103 are along directional light
The optical axis of pipe is set gradually.Light source 101 is equipped with spot hole, the light that light source 101 issues for providing required light, star tester 102
It is emitted through spot hole, for simulating point light source, spot hole is located at the focal position of the first lens 103, passes through the light from spot hole spot hole
After first lens 103, it is parallel to the optical axis outgoing of the first lens 103.
Optionally, the diameter d of spot hole0Meet following formula:
Wherein, λ is the wavelength of incident light, fcFor the focal length of first lens, n1For image space refractive index, D0For to
The diameter of detector lens.In the utility model embodiment, light source be common white light source, wavelength X=560 μm of incident light,
The focal length f of first lenscFor 500~1000mm, image space is air, refractive index n1It is 1.
Optionally, as shown in fig. 6, parallel light tube further includes equal tabula rasa 104, equal tabula rasa 104 can be frosted glass or sub- gram
Power plate, equal tabula rasa 104 are set between light source 101 and star tester 102, and the light uniform irradiation for issuing light source 101 is in star tester
On 102.
Optionally, measuring unit 200 includes the second lens and ccd detector, and the second lens are for receiving to be detected
The light of camera lens 500, and couple it to ccd detector.Second lens can be the remote microcobjective of unlimited flat field achromatism, amplification
Multiplying power k is 50 times, and numerical aperture NA is 0.8, and the image planes of the second lens are the sensitive surface of ccd detector.
Optionally, as shown in Figure 1, measuring unit 200 further includes moving assembly, the second lens and ccd detector pass through mirror
Cylinder is connect with moving assembly, and moving assembly is mobile for driving the second lens and ccd detector.Optionally, in the utility model
In embodiment, moving assembly includes first movement component 201 and the second moving parts 202, and the second lens pass through with ccd detector
Lens barrel is connect with first movement component 201, first movement component 201 and the movable connection of second moving parts 202, and second
Moving parts 202 is flexibly connected with the pedestal 12 of lens detecting device；First movement component 201 can be along the optical axis side of the second lens
It to movement, i.e., is moved along Z axis, second component 202 can translate along the y axis in 12 plane of pedestal, 12 plane of pedestal and second
The optical axis of lens is vertical, i.e., vertical with Z axis.When detecting zero visual field when disperse spot diameter, moved first by moving assembly
Dynamic horizontal CCD detector and the second lens, make the optical axis of the second lens, the optical axis of camera lens to be detected 500 and parallel light tube 100
Then optical axis coincidence moves up and down ccd detector, focus, and looks for best articulation point.More when detecting peripheral field
When speckle diameter, ccd detector is moved to optimal height and position when the test of zero visual field, and moves horizontally ccd detector, measures
The disperse circular diameter of corresponding different image height positions.The movement of moving assembly has step motor control, and stepper motor is by computer
Software control is controlled, the stepping accuracy of moving assembly requires 1 μm.
Optionally, to be detected as shown in Fig. 2, offering through-hole compatible with camera lens 500 to be detected on objective table 300
Camera lens 500 is immobilizated in through-hole by a retaining piece 301.Optionally, which is detachably connected with objective table, according to
The size of camera lens 500 to be detected selects corresponding retaining piece 301.
Optionally, 300 bottom of objective table is provided with the plate glass of high transparency.During lens design, one piece is had
Certain thickness plate glass, and in the case where considering plate glass, aberration correction.If without design thickness in test process
Plate glass, the back focal length that will lead to test changes, and surrounding visual field aberration increases, on focal plane can not clearly at
Picture.
In the description of this article, it is to be understood that the orientation or positional relationships such as term " on " are based on the figure
Orientation or positional relationship is merely for convenience of description and simplification operation, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In the description of this specification, the description of reference term " embodiment " etc. means the specific spy in conjunction with the embodiment
Sign, structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, right
The schematic representation of above-mentioned term is not necessarily referring to identical embodiment.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this narrating mode of specification be only be to understand device, those skilled in the art should
It considers the specification as a whole, the technical solutions in the embodiments can also be appropriately combined, and forming those skilled in the art can
With the other embodiments of understanding.
Technical principle of the utility model has been described above with reference to specific embodiments.These descriptions are intended merely to explain this reality
With novel principle, and it cannot be construed to the limitation to scope of protection of the utility model in any way.Based on the explanation herein,
Those skilled in the art, which does not need to pay for creative labor, can associate with other specific implementation modes of this utility model,
These modes are fallen within the protection scope of the utility model.
Claims (10)
1. a kind of lens detecting device, which is characterized in that including parallel light tube, measuring unit, objective table and yoke assembly；
The objective table is for carrying camera lens to be detected；
The parallel light tube is for providing point light source, and the light beam for issuing the point light source is parallel to the light of the parallel light tube
Axis outgoing, couples the camera lens to be detected for collimated light beam；The measuring unit comes from the camera lens to be detected for receiving
Light；
The yoke assembly is connect with the parallel light tube, for driving the parallel light tube around the optics of the camera lens to be detected
Center rotating.
2. lens detecting device according to claim 1, which is characterized in that the yoke assembly includes deflection arm, described
Deflection arm one end connects parallel light tube, on the movable frame for being connected to the lens detecting device of the other end.
3. lens detecting device according to claim 1, which is characterized in that the parallel light tube includes light source, star tester
With the first lens；The light source, star tester and the first lens are set gradually along the optical axis of the parallel light tube；
The light source is for providing required light；The star tester is equipped with spot hole, and for simulating point light source, the spot hole is located at
The focal position of first lens.
4. lens detecting device according to claim 3, which is characterized in that the diameter d of the spot hole0Meet following formula:
Wherein, λ is the wavelength of incident light, fcFor the focal length of first lens, n1For image space refractive index, D0For it is described to
The diameter of detector lens.
5. lens detecting device according to claim 3, which is characterized in that the parallel light tube further includes equal tabula rasa, institute
Equal tabula rasa is stated to be set between the light source and the star tester.
6. lens detecting device according to claim 1, which is characterized in that the measuring unit include the second lens and
Ccd detector, second lens couple it to ccd detector for receiving the light from the camera lens to be detected.
7. lens detecting device according to claim 6, which is characterized in that the measuring unit further includes moving assembly,
Second lens are connect by lens barrel with the moving assembly with ccd detector, and the moving assembly is for driving described the
Two lens and ccd detector are mobile.
8. lens detecting device according to claim 7, which is characterized in that the moving assembly includes first movement component
With the second moving parts, second lens are connect by lens barrel with the first movement component with ccd detector, and described first
Moving parts and the movable connection of the second moving parts, the pedestal of second moving parts and the lens detecting device
It is flexibly connected；The first movement component can be moved along the optical axis direction of second lens, and second moving parts can be
Translation, the base plane are vertical with the optical axis of second lens in the base plane.
9. lens detecting device according to claim 1, which is characterized in that offered on the objective table with it is described to be checked
The compatible through-hole of camera lens is surveyed, the lens fixing to be detected is in the through-hole.
10. lens detecting device according to claim 9, which is characterized in that the objective table bottom is provided with plate glass
Glass.
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| CN201821786622.1U CN208953254U (en) | 2018-10-31 | 2018-10-31 | A kind of lens detecting device |
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| CN201821786622.1U CN208953254U (en) | 2018-10-31 | 2018-10-31 | A kind of lens detecting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964454A (en) * | 2021-02-05 | 2021-06-15 | 深圳中科飞测科技股份有限公司 | Detection system and detection method |
| CN113188760A (en) * | 2021-03-29 | 2021-07-30 | 杭州涂鸦信息技术有限公司 | Fresnel lens test equipment and test method |
| CN113301328A (en) * | 2021-05-21 | 2021-08-24 | 上海研鼎信息技术有限公司 | Camera testing device |
| CN114071130A (en) * | 2021-12-31 | 2022-02-18 | 中国科学院西安光学精密机械研究所 | Underwater imaging lens imaging quality parameter detection method and underwater special collimator |
-
2018
- 2018-10-31 CN CN201821786622.1U patent/CN208953254U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964454A (en) * | 2021-02-05 | 2021-06-15 | 深圳中科飞测科技股份有限公司 | Detection system and detection method |
| CN113188760A (en) * | 2021-03-29 | 2021-07-30 | 杭州涂鸦信息技术有限公司 | Fresnel lens test equipment and test method |
| CN113301328A (en) * | 2021-05-21 | 2021-08-24 | 上海研鼎信息技术有限公司 | Camera testing device |
| CN113301328B (en) * | 2021-05-21 | 2023-02-28 | 上海研鼎信息技术有限公司 | Camera testing device |
| CN114071130A (en) * | 2021-12-31 | 2022-02-18 | 中国科学院西安光学精密机械研究所 | Underwater imaging lens imaging quality parameter detection method and underwater special collimator |
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