CN108445602A - A kind of confocal optical system for measuring bloomed lens center thickness - Google Patents
A kind of confocal optical system for measuring bloomed lens center thickness Download PDFInfo
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- CN108445602A CN108445602A CN201810042661.9A CN201810042661A CN108445602A CN 108445602 A CN108445602 A CN 108445602A CN 201810042661 A CN201810042661 A CN 201810042661A CN 108445602 A CN108445602 A CN 108445602A
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- concave
- lens
- optical system
- convex lens
- confocal optical
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Abstract
The invention discloses a kind of confocal optical system for measuring bloomed lens center thickness, along input path, diaphragm D, concave-convex lens A1, concave-convex lens A2, biconvex lens A3, concave-convex lens A4 is arranged in interval to the optical system successively from front to back；Wherein diaphragm D is arranged in the front surface of concave-convex lens A1；The plane of incidence of the concave-convex lens A1 is concave surface, and exit facet is convex surface；The plane of incidence of the concave-convex lens A2 is concave surface, and exit facet is convex surface；The plane of incidence of the concave-convex lens A3 is convex surface, and exit facet is concave surface；The diaphragm D is arranged in the front surface of concave-convex lens A1；The Physical space NA of the confocal optical system is equal to 0.17；The wavelength of the confocal optical system is 400nm, 600nm, 800nm, 1000nm；Confocal optical system of the present invention is simple in structure, and the measurement range of bloomed lens center thickness is made to reach 11.5mm or more, greatly improves precision.
Description
Technical field
The present invention relates to field of photodetection more particularly to a kind of confocal optics for measuring bloomed lens center thickness
System.
Background technology
In field of photodetection, two kinds are broadly divided into the measurement method of lens center thickness at present：Contact type measurement
And non-contact measurement.Contact measurement method generally uses the tools such as Centigrade scale or micrometer directly to measure；Contactless survey
There are many kinds of amount methods, wherein based on the contactless measurement of confocal optical system with it quick accurate the advantages that,
Large batch of lens are widely used during manufacturing.Confocal optical system is varied, but in many cases just for
The detection of non-bloomed lens, it is not fully up to expectations to the measurement accuracy of bloomed lens.
Invention content
The object of the present invention is to provide a kind of confocal optical systems for measuring bloomed lens center thickness, compare
Existing confocal system, structure optimization is at low cost, and operating wavelength range is wide, and measurement range is big, high certainty of measurement.
The scheme of the invention is：A kind of confocal optical system for measuring bloomed lens center thickness, the optical system
System includes along input path interval setting diaphragm D, concave-convex lens A1, concave-convex lens A2, biconvex lens A3, recessed successively from front to back
Convex lens A4；Wherein diaphragm D is arranged in the front surface of concave-convex lens A1；
The optical system meets the following conditions：
The concave-convex lens A1 meets：Vd ＞ 50；
The concave-convex lens A2 meets：Nd ＞ 1.75, Vd ＜ 50；
The biconvex lens A3 meets：Nd ＞ 1.75, Vd ＜ 50；
The concave-convex lens A4 meets：Nd ＞ 1.75, Vd ＜ 50；
The radius of the diaphragm D is equal to 5.17mm；
Wherein, Nd indicates that the d optical indexs of lens material, Vd indicate the d light Abbe constants of lens material.
In above-mentioned apparatus, the Physical space NA of the confocal optical system is equal to 0.17.
In above-mentioned apparatus, the design wavelength of the confocal optical system is 400nm, 600nm, 800nm, 1000nm.
In above-mentioned apparatus, the material of the concave-convex lens A1 is the crown glass of low dispersion.
In above-mentioned apparatus, the material of the concave-convex lens A2 is the flint glass of high refractive index.
In above-mentioned apparatus, the material of the biconvex lens A3 is the flint glass of high refractive index.
In above-mentioned apparatus, the material of the concave-convex lens A4 is the flint glass of high refractive index.
Wherein, NA indicates the numerical aperture of optical system.
Beneficial effects of the present invention：
The present invention provides a kind of for measuring the confocal optical system of bloomed lens center thickness, by four lens with
And the combination of diaphragm, without using bigger Lens, do not need more eyeglasses and increasingly complex structure, i.e., control at
Under the premise of this, realizes to bloomed lens center thickness wide range of measurement, 11.5mm or more, measurement accuracy height etc. can be reached
Advantage.
Description of the drawings
Fig. 1 is the structural schematic diagram of the confocal optical system of the embodiment of the present invention.
Fig. 2 is the axial chromatic aberration schematic diagram of the confocal optical system of the embodiment of the present invention.
Fig. 3 is each configuration MFT schematic diagrames of the confocal optical system of the embodiment of the present invention.
Fig. 4 is each face spherical aberration datagram of the confocal optical system of the embodiment of the present invention.
Fig. 5 is the index path of the confocal optical system of the embodiment of the present invention.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of structure for measuring the confocal optical system of bloomed lens center thickness of the present embodiment
Schematic diagram, the optical system include along input path spaced diaphragm D, concave-convex lens A1, bumps successively from front to back
Lens A2, biconvex lens A3, concave-convex lens A4；Wherein diaphragm D is arranged in the front surface of concave-convex lens A1.
Further, above-mentioned concave-convex lens A1 meets：Vd ＞ 50；Above-mentioned concave-convex lens A2 meets：Nd ＞ 1.75, Vd
＜ 50；Above-mentioned biconvex lens A3 meets：Nd ＞ 1.75, Vd ＜ 50；Above-mentioned concave-convex lens A4 meets：Nd ＞ 1.75, Vd ＜
50；And the radius of diaphragm D is 5.17mm；
Wherein, Nd indicates that the d optical indexs of lens material, Vd indicate the d light Abbe constants of lens material.
Further, the material of above-mentioned concave-convex lens A1 is low dispersion crown glass, for controlling spherical aberration；It is above-mentioned concave-convex saturating
The material of mirror A2 is high refractive index flint glass, and the material of above-mentioned biconvex lens A3 is high refractive index flint glass, above-mentioned bumps
The material of lens A4 is high refractive index flint glass, and said lens combination can generate larger axial chromatic aberration in service band,
The advantages of realizing wide range of measurement；By the concave-convex lens A1 of the low dispersion and concave-convex lens A2 of high refractive index, convex lens A3, recessed
The lens groups such as convex lens A4 cooperate, the monochromatic aberration of optimization system.
Fig. 2 is the axial chromatic aberration schematic diagram of the confocal optical system of the embodiment of the present invention；As shown in Fig. 2, from left to right four
Vertical line has respectively represented the light of wavelength 400nm, 600nm, 800nm and 1000nm, and the intersection point of they and horizontal axis represents light
The position that line focuses on optical axis, it can be seen that axial chromatic aberration of the wavelength between 400nm and 1000nm light is substantially
11.5mm so that the measurement range of bloomed lens center thickness reaches 11.5mm or more, meets the required axis of wide range of measurement
To this big feature of aberration.
Fig. 3 is each configuration MTF schematic diagrames of the confocal optical system of the embodiment of the present invention, what (a)-(d) was indicated respectively
It is the MTF schematic diagrames under different configuration, central vision, 0.05 visual field and 0.1 visual field is respectively illustrated again under each configuration
MTF curve；The monochromatic aberration of the confocal optical system has obtained good correction as seen from the figure, improves measurement accuracy.
Fig. 4 is each face spherical aberration datagram of the confocal optical system of the embodiment of the present invention, it can be seen that incident light is passing through
The spherical aberration for crossing the formation later of each face of lens group is very small, and last total spherical aberration value only has 0.004968, illustrates that whole system is excellent
The result of change disclosure satisfy that requirement, can further increase measurement accuracy.
Fig. 5 is the index path of the confocal optical system of inventive embodiments；As shown in figure 5, the light of different wave length passes through light
It is converged in after system at the different location of same optical axis, forms strong axial chromatic aberration, make the survey of bloomed lens center thickness
It measures range and becomes wide.
The data of optical system provided in this embodiment are as follows：
| Surface Surf | Radius Radius | Thickness Thickness | Refractive index Nd |
| Object plane OBJ | Infinite Infinity | 29.942 | - |
| Diaphragm STO | -35.725 | 5.051 | 1.6935 |
| 2 | -24.089 | 0.585 | - |
| 3 | -114.383 | 4.556 | 1.7572 |
| 4 | -46.083 | 1.000 | - |
| 5 | 192.086 | 4.618 | 1.7572 |
| 6 | -140.053 | 7.201 | - |
| 7 | 49.637 | 4.671 | 1.7572 |
| 8 | 142.817 | 0 | - |
| Image planes IMA | Infinity | - | - |
Above-listed preferred embodiment, has been further described the object, technical solutions and advantages of the present invention, is answered
Understand, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (9)
1. a kind of confocal optical system for measuring bloomed lens center thickness, which is characterized in that including：Certainly along input path
Diaphragm D, concave-convex lens A1, concave-convex lens A2, biconvex lens A3, concave-convex lens A4 is arranged in interval successively after forward direction；
The optical system meets the following conditions：
The concave-convex lens A1 meets：Vd ＞ 50；
The concave-convex lens A2 meets：Nd ＞ 1.75, Vd ＜ 50；
The biconvex lens A3 meets：Nd ＞ 1.75, Vd ＜ 50；
The concave-convex lens A4 meets：Nd ＞ 1.75, Vd ＜ 50；
The radius of the diaphragm D is equal to 5.17mm；
Wherein, Nd indicates that the d optical indexs of lens material, Vd indicate the d light Abbe constants of lens material.
2. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the diaphragm D is arranged in the front surface of concave-convex lens A1.
3. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the plane of incidence of the concave-convex lens A1 is concave surface, and exit facet is convex surface；The plane of incidence of the concave-convex lens A2 is concave surface, is gone out
It is convex surface to penetrate face；The plane of incidence of the concave-convex lens A3 is convex surface, and exit facet is concave surface.
4. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the Physical space NA of the confocal optical system is equal to 0.17.
5. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the material of the concave-convex lens A1 is the crown glass of low dispersion.
6. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the material of the concave-convex lens A2 is the flint glass of high refractive index.
7. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the material of the biconvex lens A3 is the flint glass of high refractive index.
8. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the material of the concave-convex lens A4 is the flint glass of high refractive index.
9. a kind of confocal optical system for measuring bloomed lens center thickness according to claim 1, feature exist
In the wavelength of the confocal optical system is 400nm, 600nm, 800nm, 1000nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810042661.9A CN108445602A (en) | 2018-01-17 | 2018-01-17 | A kind of confocal optical system for measuring bloomed lens center thickness |
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| CN201810042661.9A CN108445602A (en) | 2018-01-17 | 2018-01-17 | A kind of confocal optical system for measuring bloomed lens center thickness |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357623A (en) * | 2018-11-16 | 2019-02-19 | 中国科学院光电技术研究所 | A kind of method and apparatus with confocal microscope system measurement mobile phone faceplate thickness |
| CN111220544A (en) * | 2020-01-19 | 2020-06-02 | 河海大学 | Lens quality detection device and detection method |
| CN114023473A (en) * | 2021-11-03 | 2022-02-08 | 哈尔滨工程大学 | Measuring device based on meniscus compensation method |
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2018
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| CN202975457U (en) * | 2012-06-20 | 2013-06-05 | 利达光电股份有限公司 | Low-cost wide-spectrum day and night confocal trigger lens optical system |
| CN104914573A (en) * | 2015-05-15 | 2015-09-16 | 江苏大学 | Laser device of long-focal depth and small-focal spot lens focusing system |
| CN205262410U (en) * | 2015-11-25 | 2016-05-25 | 江苏大学 | Multiple spot simultaneous measurement single face coated lens's coating film thickness device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357623A (en) * | 2018-11-16 | 2019-02-19 | 中国科学院光电技术研究所 | A kind of method and apparatus with confocal microscope system measurement mobile phone faceplate thickness |
| CN111220544A (en) * | 2020-01-19 | 2020-06-02 | 河海大学 | Lens quality detection device and detection method |
| CN114023473A (en) * | 2021-11-03 | 2022-02-08 | 哈尔滨工程大学 | Measuring device based on meniscus compensation method |
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Application publication date: 20180824 |
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