CN207601408U - A kind of big target surface measures camera lens - Google Patents
A kind of big target surface measures camera lens Download PDFInfo
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- CN207601408U CN207601408U CN201721343642.7U CN201721343642U CN207601408U CN 207601408 U CN207601408 U CN 207601408U CN 201721343642 U CN201721343642 U CN 201721343642U CN 207601408 U CN207601408 U CN 207601408U
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Abstract
The utility model discloses a kind of big target surfaces to measure camera lens.Including collecting lens and imaging microscope group, imaging microscope group includes group after group before imaging lens and imaging lens, and diaphragm is placed in the center of imaging microscope group；If it organizes and organizes after imaging lens respectively by the dry plate lens group of equal amount into the shape relative to the symmetrical each lens of diaphragm is identical, and lens are spherical surface or aspherical, the center of curvature and diaphragm homonymy before imaging lens；For group in group after imaging lens, the ratio between its curvature of surface curvature and another side close to diaphragm one side of the close two panels lens of diaphragm both sides is less than 1 before imaging lens；The ratio between its curvature of surface curvature and another side close to diaphragm one side of remaining lens is more than 4.The procephalic focus lamp of the utility model mirror can realize object space telecentricity and short distance imaging, the near symmetrical structure of imaging microscope group lens ensure that the realization of big target surface, and lateral aberration can be reduced, the number of lenses of microscope group can be imaged by increase further reduces distortion and aberration, improves the resolution capability for measuring camera lens.
Description
Technical field
The utility model is related to a kind of big target surfaces suitable for commercial measurement to measure camera lens.
Background technology
For the products such as electronics, machinery, material in production process is manufactured, the automatic detection of product quality is more and more extensive,
The core component that camera lens is detecting system is measured, to ensure the precision and efficiency of measuring system, it is desirable that the target surface of camera lens is big, distortion
It is small, image quality is high, especially product size detection in, it is desirable that be imaged insensitive to the height and position of workpiece.
The image-forming range that conventional machines vision lens are supported is all in more than 0.2m, according to object image distance imaging relations, it is difficult to use
In accurate measuring system, and the target surface that machine visual lens are supported is all below 2/3 inch.Document " variable focal length machine
Vision lens Optical System Design "（Application Optics, the 2nd phase of volume 36,2015）Provide the machine vision mirror of a zoom
Head, detector target surface are 1/3 inch, and image-forming range is in more than 0.29m, although zoom mode facilitates adjustment imaging viewing field and divides
Resolution, but be difficult closely to be imaged, and due to being unsatisfactory for object space telecentricity can bring error during measurement using such camera lens.
Invention content
The utility model is in view of the deficienciess of the prior art, provide a kind of high resolution measurement mirror of short distance imaging
Head, which has the characteristics that low distortion, object space telecentricity, big target surface, high-resolution, small size, especially suitable for commercial measurement
Field.
The technical solution adopted in the utility model is：A kind of big target surface is provided and measures camera lens, by light incident direction, successively
Including collecting lens and imaging microscope group, group is placed in imaging lens with group after imaging lens, diaphragm before the imaging microscope group includes imaging lens
The center of group；If before imaging lens group with organized after imaging lens respectively by the dry plate lens group of equal amount into symmetrical relative to diaphragm
The shape of each lens of distribution is identical, and the lens are spherical surface or aspherical, the center of curvature of lens and diaphragm homonymy；Imaging lens
After preceding group and imaging lens in group, the two panels lens close to diaphragm both sides are respectively thick meniscus lens, the thick meniscus lens its
The ratio between the surface curvature of close diaphragm one side and the curvature of another side are less than 1；Remaining lens be thin meniscus lens, the thin bent moon
The ratio between its curvature of surface curvature and another side close to diaphragm one side of lens is more than 4.
In technical solutions of the utility model, camera lens front end is used to collect the emergent light of object plane different location using collecting lens
Multiple lens can be used as light harvesting microscope group in line, small F numbers when being imaged, big F numbers can use single element lens when being imaged.In addition to collecting light
Can, collecting lens is exactly to realize camera lens object space telecentricity there are one important function, is parallel to the chief ray of object plane different location
Optical center optical axis.Light is incident on after collecting lens is collected by the nearly symmetrical lens set of multiple lens, i.e. imaging lens
Group.Diaphragm is provided centrally in imaging microscope group, two eyeglasses close to diaphragm both sides are thick meniscus lens, and two thick bent moon is saturating
The both sides of mirror are respectively thin meniscus lens, can be needed to continue symmetrical increase lens in both sides according to imaging.The imaging microscope group owns
Face curvature center all with diaphragm homonymy.Microscope group aberration correction is imaged, and light is refocused target surface, is thus carried out into
Picture.Change microscope group focal length can zoom in or out object plane imaging according to actual needs.By change diaphragm can limit into
Enter the size of target surface luminous energy.
Compared with prior art, the beneficial effects of the utility model are：
1. the procephalic focus lamp of mirror can realize object space telecentricity and short distance imaging, object in measurement process can be avoided uneven
The whole influence to measuring size precision, and the object size of different depth can be measured simultaneously.
2. the utility model measures camera lens using short-range object space telecentricity, it is imaged the near symmetrical structure of microscope group lens
It can be imaged on the detection more than 1 inch of target surface, ensure that the realization of big target surface, and lateral aberration can be reduced, distortion is controllable
Below 0.5%.According to actual needs, the number of lenses that microscope group can be imaged by increase further reduces distortion and aberration, improves
Measure the resolution capability of camera lens.
3. spherical surface or aspherical can be used in the eyeglass provided by the utility model for measuring camera lens, eyeglass uses two kinds of glass materials
Material, while lens imaging performance is ensured, makes eyeglass realization easy to process, reduces cost.
Description of the drawings
Fig. 1 is that a kind of big target surface that the utility model embodiment provides measures the structure diagram of camera lens；
In figure, 1. condensers；2. the first eyeglass organized before imaging lens；3. the second eyeglass organized before imaging lens；4. imaging lens
The first eyeglass organized afterwards；5. the second eyeglass organized before imaging lens；6. diaphragm；7. it is imaged microscope group.
Specific embodiment
The technical solution of the utility model is specifically illustrated with reference to the accompanying drawings and examples.
Referring to attached drawing 1, it is the structure diagram that a kind of big target surface provided in this embodiment measures camera lens；Measure camera lens packet
Condenser 1 and imaging microscope group 7 are included, along light incident direction, is followed successively by condenser 1, the first eyeglass 2 and second organized before imaging lens
Eyeglass 3, the first eyeglass 4 and the second eyeglass 5 and the diaphragm 6 among eyeglass 3 and 4 organized after imaging lens, relative to diaphragm
The shape of each lens of the imaging microscope group of positional symmetry distribution is identical.
For the eyeglass provided in this embodiment for measuring camera lens all using spherical surface, eyeglass uses two kinds of glass materials, imaging lens
Group first half or it is latter half of flint and crown glass material is respectively adopted, while lens imaging performance is ensured, make eyeglass easy
It is realized in processing, reduces cost.Object distance can suitably be adjusted according to object plane and image planes conjugate imaging position.Due to camera lens forepart
Focus lamp can realize object space telecentricity, it is possible thereby to avoid object out-of-flatness in measurement process to measuring size the influence of precision,
And the object size of different depth can be measured simultaneously.The shape of imaging each lens of microscope group is symmetric relative to diaphragm, the knot
Structure ensure that the realization of big target surface, reduce lateral aberration, and distortion can be controlled in less than 0.5%.According to actual needs, increasing can be passed through
Addition further reduces distortion and aberration as the number of lenses of microscope group.Lens edge relative illumination is more than 70%.
Big target surface provided in this embodiment measures camera lens, and each lens parameters such as table is provided successively with the sequence of light incident direction
Shown in 1.
Table 1
。
Claims (2)
1. a kind of big target surface measures camera lens, it is characterised in that：By light incident direction, successively including collecting lens and imaging microscope group,
The imaging microscope group includes group after group before imaging lens and imaging lens, and diaphragm is placed in the center of imaging microscope group；Before imaging lens group and
If it is organized after imaging lens respectively by the dry plate lens group of equal amount into relative to the shape phase of the symmetrical each lens of diaphragm
Together, the lens are spherical surface or aspherical, the center of curvature of lens and diaphragm homonymy；Before imaging lens after group and imaging lens in group,
Two panels lens close to diaphragm both sides are respectively thick meniscus lens, its surface close to diaphragm one side of the thick meniscus lens is bent
The ratio between rate and the curvature of another side are less than 1；Remaining lens be thin meniscus lens, the thin meniscus lens its close to diaphragm one side
The ratio between surface curvature and the curvature of another side are more than 4.
2. a kind of big target surface according to claim 1 measures camera lens, it is characterised in that：The total focal length of camera lens, collecting lens
Focal lengthWith the focal length of imaging microscope groupMeet relationship： , ；The focal length organized before imaging lens1 and imaging lens after the focal length organized2 meet relationship：。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721343642.7U CN207601408U (en) | 2017-10-18 | 2017-10-18 | A kind of big target surface measures camera lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721343642.7U CN207601408U (en) | 2017-10-18 | 2017-10-18 | A kind of big target surface measures camera lens |
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| CN207601408U true CN207601408U (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854950A (en) * | 2020-07-30 | 2020-10-30 | 中国科学院长春光学精密机械与物理研究所 | Optical system of multi-time image surface spectrometer |
-
2017
- 2017-10-18 CN CN201721343642.7U patent/CN207601408U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854950A (en) * | 2020-07-30 | 2020-10-30 | 中国科学院长春光学精密机械与物理研究所 | Optical system of multi-time image surface spectrometer |
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