CN109239892B - Fixed-magnification optical image detection system and imaging method thereof - Google Patents
Fixed-magnification optical image detection system and imaging method thereof Download PDFInfo
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- CN109239892B CN109239892B CN201811391679.6A CN201811391679A CN109239892B CN 109239892 B CN109239892 B CN 109239892B CN 201811391679 A CN201811391679 A CN 201811391679A CN 109239892 B CN109239892 B CN 109239892B
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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
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- 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
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention relates to a fixed-magnification optical image detection system, which consists of six glass spherical lenses, wherein a front group A, a diaphragm C and a rear group B are sequentially arranged from left to right along the incidence direction of light rays, the front group A comprises a biconvex lens A1 with positive focal power, a meniscus lens A2 with negative focal power, a meniscus lens A3 with positive focal power, and the rear group B comprises a biconvex lens B1 with positive focal power, a biconcave lens B2 with negative focal power and a meniscus lens B3 with positive focal power. The optical system meets the requirements of a double-measurement telecentric system, can stably image in a certain depth of field and keep the same magnification, effectively solves the problem of judgment errors, has superior image quality due to high resolution, and can be better applied to the high-precision measurement fields such as size measurement and the like.
Description
Technical Field
The invention relates to a fixed-magnification optical imaging system and an imaging method thereof.
Background
In recent years, the field of machine vision has been rapidly developed, and an optical imaging apparatus, which is one of the indispensable components, should have an ability to cope with a complex and diverse detection environment. In the existing market, most of optical detection equipment is mainly a non-telecentric lens, when the detected object has position deviation, the optical detection equipment cannot accurately measure, the bilateral telecentric lens can perform equal-magnification imaging when the detected object has defocus, the imaging definition under different object distances is ensured in a larger depth of field range, the incident light and the emergent light are perpendicular to the detected object, and the image reduction can be efficiently performed on the detected object, so that the measurement accuracy is improved.
Disclosure of Invention
The invention aims at overcoming the defects, and provides a fixed-magnification optical imaging system with a simple structure and an imaging method thereof.
The technical scheme of the invention is that the optical image detection system with fixed magnification is composed of six glass spherical lenses, a front group A, a diaphragm C and a rear group B are sequentially arranged from left to right along the incidence direction of light rays, wherein the front group A comprises a biconvex lens A1 with positive focal power, a meniscus lens A2 with negative focal power, a meniscus lens A3 with positive focal power, and the rear group B comprises a biconvex lens B1 with positive focal power, a biconcave lens B2 with negative focal power and a meniscus lens B3 with positive focal power.
Further, the meniscus lens A2 with negative focal power and the meniscus lens A3 with positive focal power form a front group of bonding sheets, and the biconvex lens B1 with positive focal power and the biconcave lens B2 with negative focal power form a rear group of bonding sheets.
Further, the focal power of the front group a is positive, and the focal power of the rear group B is negative.
Further, the focal length of the optical system is set to be f, and the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2, and the meniscus lens B3 are respectively f1, f2, f3, f4, f5, and f6; the following ratio is satisfied with the focal length f: 0.13< f1/f <0.16; -0.14< f2/f < -0.11;0.1< f3/f <0.13;0.05< f4/f <0.1; -0.8< f5/f <0.03;0.12< f6/f <0.15.
Further, f4 and f5 must satisfy: -1.9< f4/f5< -1.4.
Further, the material adopted by the biconvex lens A1 is flint glass; the material adopted by the meniscus lens A2 is flint glass; the meniscus lens A3 is made of crown glass; the biconvex lens B1 is made of crown glass; the biconcave lens B2 is made of flint glass; the meniscus lens B3 is made of crown glass.
Further, the air space between the biconvex lens A1 and the meniscus lens A2 is 2.8mm; the air space between the meniscus lens A3 and the diaphragm C is 43.5mm; the air space between the diaphragm C and the biconvex lens B1 is 28.9mm; the air space between the biconcave lens B2 and the meniscus lens B3 is 26.6mm; the air distance from the meniscus lens B3 to the imaging surface is 26.1mm.
Further, the air gap between the front group a and the rear group B was 72.4mm.
An imaging method of a fixed-magnification optical imaging system comprises the following steps: the light rays sequentially pass through the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2 and the meniscus lens B3 from left to right for imaging.
Compared with the prior art, the invention has the following beneficial effects: the optical image detection system adopts a six-piece structure, and effectively balances the chromatic aberration problem introduced by the large-field lens through a material combination form of high Abbe with positive focal power and low Abbe with negative focal power, and ensures that the incident principal ray of the object side and the emergent principal ray of the image side are parallel to the optical axis, so that the same magnification can be maintained within a certain object distance range, the detection stability is ensured, the brightness uniformity of a picture can be ensured by the maximum principal ray emergence angle close to zero, and the possibility of unbalance of the brightness of the large-field lens is effectively reduced.
Drawings
The patent of the invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an optical imaging system according to an embodiment of the invention.
FIG. 2 is a transfer diagram of an optical inspection system according to an embodiment of the present invention.
In the figure: a front group a, a diaphragm C, a rear group B, a biconvex lens A1, a meniscus lens A2, a meniscus lens A3, a biconvex lens B1, a biconcave lens B2, and a meniscus lens B3.
Description of the embodiments
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 2, the optical image capturing system is composed of six glass spherical lenses, and a front group a, a diaphragm C, and a rear group B are sequentially arranged from left to right along the light incidence direction, wherein the front group a includes a biconvex lens A1 with positive optical power, a meniscus lens A2 with negative optical power, a meniscus lens A3 with positive optical power, and the rear group B includes a biconvex lens B1 with positive optical power, a biconcave lens B2 with negative optical power, and a meniscus lens B3 with positive optical power.
In the present embodiment, the meniscus lens A2 with negative optical power and the meniscus lens A3 with positive optical power form a front group of bonding sheets, and the biconvex lens B1 with positive optical power and the biconcave lens B2 with negative optical power form a rear group of bonding sheets.
In this embodiment, the optical power of the front group a is positive and the optical power of the rear group B is negative.
In the present embodiment, the focal length of the optical system is set to be f, and the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2, and the meniscus lens B3 are f1, f2, f3, f4, f5, and f6, respectively; the following ratio is satisfied with the focal length f: 0.13< f1/f <0.16; -0.14< f2/f < -0.11;0.1< f3/f <0.13;0.05< f4/f <0.1; -0.8< f5/f <0.03;0.12< f6/f <0.15.
In this embodiment, f4 and f5 must satisfy: -1.9< f4/f5< -1.4.
In this embodiment, the material used for the biconvex lens A1 is flint glass; the material adopted by the meniscus lens A2 is flint glass; the meniscus lens A3 is made of crown glass; the biconvex lens B1 is made of crown glass; the biconcave lens B2 is made of flint glass; the meniscus lens B3 is made of crown glass; the refractive index difference of the bonding sheet is improved, the introduction of partial aberration is effectively reduced, the introduction of chromatic aberration can be effectively reduced through the matching of Abbe number and partial dispersion, the incidence angle of light can be effectively reduced through methods such as focal power adjustment, surface curvature control and the like, and the sensitivity of each lens is reduced, so that the assembly difficulty of the whole lens is reduced, the processability is improved, and the actual cost of the lens is effectively reduced.
In the present embodiment, the air space between the biconvex lens A1 and the meniscus lens A2 is 2.8mm; the air space between the meniscus lens A3 and the diaphragm C is 43.5mm; the air space between the diaphragm C and the biconvex lens B1 is 28.9mm; the air space between the biconcave lens B2 and the meniscus lens B3 is 26.6mm; the air distance from the meniscus lens B3 to the imaging surface is 26.1mm.
In this embodiment, the air gap between the front group a and the rear group B is 72.4mm.
An imaging method of a fixed-magnification optical imaging system comprises the following steps: the light rays sequentially pass through the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2 and the meniscus lens B3 from left to right for imaging.
In this embodiment, the optical system composed of the lens groups described above achieves the following optical indexes: the working distance of the fixed-magnification optical image detection system is 110mm, the TV distortion is less than or equal to 0.01%, the object space telecentricity is less than or equal to 0.01%, the image space telecentricity is less than or equal to 0.03%, the magnification=1.5, the corresponding chip size is 2/3 ", and the optical post-intercept L' is more than or equal to 26.1mm.
In this embodiment, the parameters of each lens are shown in the following table:
in this embodiment, as shown in fig. 2, the transfer function value of the optical detection system at 50 line pairs is greater than 0.5, and the optical detection system has excellent image analysis capability, and can fully restore the object to be detected and accurately measure.
In summary, the magnification of the fixed-magnification optical image detection system provided by the invention is 1.5, and the object with a larger volume can be imaged and detected, and the object and image space telecentricity is close to zero, so that the object and image space telecentricity can form an image with the same magnification within a certain object distance range. The control object, the focal power of the image space and the surface type can effectively utilize the correction distortion of the double Gaussian structure, so that the distortion degree of an image is reduced, and meanwhile, the image quality of the image is close to the diffraction limit under the numerical aperture, so that the aims of accurate and stable measurement are fulfilled.
While the foregoing is directed to the preferred embodiment, other and further embodiments of the invention will be apparent to those skilled in the art from the following description, wherein the invention is described, by way of illustration and example only, and it is intended that the invention not be limited to the specific embodiments illustrated and described, but that the invention is to be limited to the specific embodiments illustrated and described.
Claims (6)
1. A fixed magnification optical imaging system, characterized by: the optical image detection system consists of six glass spherical lenses, and a front group A, a diaphragm C and a rear group B are sequentially arranged from left to right along the incidence direction of light rays, wherein the front group A comprises a biconvex lens A1 with positive focal power, a meniscus lens A2 with negative focal power, a meniscus lens A3 with positive focal power, and the rear group B comprises a biconvex lens B1 with positive focal power, a biconcave lens B2 with negative focal power and a meniscus lens B3 with positive focal power; the front group of bonding sheets are formed by the meniscus lens A2 with negative focal power and the meniscus lens A3 with positive focal power, and the rear group of bonding sheets are formed by the biconvex lens B1 with positive focal power and the biconcave lens B2 with negative focal power; the focal power of the front group A is positive, and the focal power of the rear group B is negative; setting the focal length of the optical system as f, and the focal lengths of the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2 and the meniscus lens B3 are respectively f1, f2, f3, f4, f5 and f6; the following ratio is satisfied with the focal length f: 0.13< f1/f <0.16; -0.14< f2/f < -0.11;0.1< f3/f <0.13;0.05< f4/f <0.1; -0.8< f5/f <0.03;0.12< f6/f <0.15.
2. The fixed magnification optical imaging system of claim 1, wherein: f4 and f5 must satisfy: -1.9< f4/f5< -1.4.
3. The fixed magnification optical imaging system of claim 1, wherein: the biconvex lens A1 is made of flint glass; the material adopted by the meniscus lens A2 is flint glass; the meniscus lens A3 is made of crown glass; the biconvex lens B1 is made of crown glass; the biconcave lens B2 is made of flint glass; the meniscus lens B3 is made of crown glass.
4. The fixed magnification optical imaging system of claim 1, wherein: the air space between the biconvex lens A1 and the meniscus lens A2 is 2.8mm; the air space between the meniscus lens A3 and the diaphragm C is 43.5mm; the air space between the diaphragm C and the biconvex lens B1 is 28.9mm; the air space between the biconcave lens B2 and the meniscus lens B3 is 26.6mm; the air distance from the meniscus lens B3 to the imaging surface is 26.1mm.
5. The fixed magnification optical imaging system of claim 1, wherein: the air gap between the front and rear groups a and B was 72.4mm.
6. A method of imaging a fixed magnification optical imaging system, characterized by using a fixed magnification optical imaging system according to any one of claims 1 to 5, and performing the steps of: the light rays sequentially pass through the biconvex lens A1, the meniscus lens A2, the meniscus lens A3, the biconvex lens B1, the biconcave lens B2 and the meniscus lens B3 from left to right for imaging.
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| CN201811391679.6A CN109239892B (en) | 2018-11-21 | 2018-11-21 | Fixed-magnification optical image detection system and imaging method thereof |
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| CN201811391679.6A CN109239892B (en) | 2018-11-21 | 2018-11-21 | Fixed-magnification optical image detection system and imaging method thereof |
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| CN109239892B true CN109239892B (en) | 2023-06-06 |
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| CN110221415B (en) * | 2019-07-08 | 2024-03-29 | 桂林弗克斯光电仪器有限公司 | Large-field double telecentric optical system |
| CN114166127B (en) * | 2021-12-08 | 2024-06-14 | 福鼎市一雄光学仪器有限公司 | Reinforcing steel bar size detector |
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| CN105467562A (en) * | 2014-09-05 | 2016-04-06 | 玉晶光电(厦门)有限公司 | Optical imaging lens and electronic device |
| CN104407431B (en) * | 2014-12-05 | 2017-11-17 | 宁波舜宇车载光学技术有限公司 | A kind of optical lens |
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