CN109298510B - Zero parallax optical image detection system and imaging method - Google Patents
Zero parallax optical image detection system and imaging method Download PDFInfo
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- CN109298510B CN109298510B CN201811388155.1A CN201811388155A CN109298510B CN 109298510 B CN109298510 B CN 109298510B CN 201811388155 A CN201811388155 A CN 201811388155A CN 109298510 B CN109298510 B CN 109298510B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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Abstract
The invention relates to a zero parallax optical image detection system and an imaging method, wherein the optical image detection system is sequentially provided with a front group A with positive focal power, a diaphragm C and a rear group B with negative focal power along the direction from left to right, the front group A comprises a first bonding group which is sequentially provided with a meniscus lens A1 and is tightly connected with a biconvex lens A2, and a second bonding group which is sequentially provided with a meniscus lens A3 and a meniscus lens A4, the rear group B comprises a third bonding group which is sequentially provided with a meniscus lens B1 and a biconcave lens B2 and a biconvex lens B3, the optical image detection system adopts a structure form of two biconcave front-arranged sheets, can sufficiently correct chromatic aberration introduced under large-magnification large-view, effectively reduces total distortion of the system through modes of gap control, diaphragm position movement, focal power balance and the like, simultaneously converges incident main light rays and emergent main light rays, and enables zero parallax characteristics to be realized.
Description
Technical Field
The invention relates to a zero parallax optical imaging system and an imaging method.
Background
The conventional industrial detection adopts common fixed focus and zoom lenses, and distortion of the lenses often brings about image distortion in the application of defect detection and size measurement, especially in the process of large-field imaging, the images formed by the lenses have serious distortion of edge image quality, and meanwhile, the larger angle of emergence of the edge chief ray can cause parallax problems such as uneven brightness, inconsistent magnification and the like of the picture. On some unstable machine tables, some conventional detection lenses are easy to cause blurring of detection patterns due to small depth of field, which is very unfavorable in the industrial field with high detection precision requirements; the common detection lens cannot meet the functions of parallax elimination, distortion elimination and the like.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical problem to be solved by the invention is to provide a zero parallax optical imaging system and an imaging method.
In order to solve the technical problems, the technical scheme of the invention is as follows: a zero parallax optical image detection system is provided with a front group A with positive focal power, a diaphragm C and a rear group B with negative focal power in sequence along the direction from left to right, wherein the front group A comprises a meniscus lens A1 with negative focal power, a biconvex lens A2 with positive focal power, a meniscus lens A3 with negative focal power and a meniscus lens A4 with positive focal power, which are sequentially arranged, the rear group B comprises a meniscus lens B1 with positive focal power, a biconcave lens B2 with negative focal power and a biconcave lens B3 with positive focal power, the meniscus lens A1 and the biconvex positive lens A2 are closely connected to form a first gluing group, the meniscus lens A3 and the meniscus lens A4 are closely connected to form a second gluing group, and the meniscus lens B1 and the biconcave lens B2 are closely connected to form a third gluing group.
Further, the air space between the front group a and the rear group B is 73.2mm, the air space between the biconvex positive lens A2 and the meniscus negative lens A3 is 1.5mm, the air space between the meniscus positive lens A4 and the diaphragm C is 41.9mm, the air space between the diaphragm C and the meniscus positive lens B1 is 31.3mm, the air space between the biconcave negative lens B2 and the biconvex positive lens B3 is 26.1mm, and the air space between the biconvex positive lens B3 and the imaging surface is 29.2mm.
Further, the focal length of the optical image detection system is f, and the meniscus negative lens A1, the biconvex positive lens A2, the meniscus negative lens A3, the meniscus positive lens A4, the meniscus positive lens B1, the biconcave negative lens B2 and the biconvex positive lens B3 are f1, f2, f3, f4, f5, f6 and f7 respectively; wherein the following ratio is satisfied with the focal length f: -0.31< f1/f < -0.27;0.08< f2/f <0.12; -0.16< f3/f < -0.14;0.11< f4/f <0.14; 0.02< f5/f <0.05;0.01< f6/f <0.03;0.06< f7/f <0.09.
Further, f4 and f5 must satisfy 2.5< f4/f5<2.9.
Further, the bonding surface of the meniscus negative lens A1 and the biconvex positive lens A2 is bent to the diaphragm side, the bonding surface of the meniscus negative lens A3 and the meniscus positive lens A4 is bent to the diaphragm side, and the bonding surface of the meniscus positive lens B1 and the biconcave negative lens B2 is bent to the diaphragm side.
Furthermore, each lens in the optical image detection system is a glass spherical lens.
Further, a first bonding group formed by the meniscus negative lens A1 and the biconvex positive lens A2 is formed by combining a crown material and a flint material, a second bonding group formed by the meniscus negative lens A3 and the meniscus positive lens A4 is formed by combining a crown material and a flint material, and a third bonding group formed by the meniscus positive lens B1 and the biconcave negative lens B2 is formed by combining a biconvex crown material.
An imaging method of a zero parallax optical imaging system comprises the following steps: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
Compared with the prior art, the invention has the following beneficial effects: by adopting the structure form of the two double-gluing front-arranged lenses, the chromatic aberration introduced under the large-magnification large-view can be sufficiently corrected, the total distortion of the system is effectively reduced by the modes of gap control, diaphragm position movement, focal power balance and the like, and the incident principal ray and the emergent principal ray are converged at the same time, so that the incident principal ray and the emergent principal ray are sufficiently parallel to the optical axis, and the zero parallax characteristic is realized.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of an optical system;
FIG. 2 is a schematic diagram of the optical transfer function of the system.
In the figure:
a-front group; b-rear group; c-diaphragm; D-IMA; a1-a negative meniscus lens; a2-biconvex positive lens; a3-meniscus negative lens; a4-meniscus positive lens; b1-positive meniscus lens; b2-biconcave negative lens; b3-biconvex positive lens.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, a zero parallax optical image detection system is sequentially provided with a front group a, a diaphragm C and a rear group B, wherein the front group a comprises a meniscus lens A1, a biconvex lens A2, a meniscus lens A3 and a meniscus lens A4, the meniscus lens A1, the biconcave lens B2 and the biconcave lens B3 are sequentially arranged, the biconcave lens B1 and the biconcave lens B2 are sequentially arranged, the meniscus negative lens A1 and the biconvex positive lens A2 are closely connected to form a first bonding group, the meniscus lens A3 and the meniscus lens A4 are closely connected to form a second bonding group, and the meniscus lens B1 and the biconcave lens B2 are closely connected to form a third bonding group.
In the present embodiment, the air space between the front group a and the rear group B is 73.2mm, the air space between the biconvex positive lens A2 and the meniscus negative lens A3 is 1.5mm, the air space between the meniscus positive lens A4 and the stop C is 41.9mm, the air space between the stop C and the meniscus positive lens B1 is 31.3mm, the air space between the biconcave negative lens B2 and the biconvex positive lens B3 is 26.1mm, and the air space between the biconvex positive lens B3 and the imaging surface is 29.2mm.
In this embodiment, the focal length of the optical imaging system is f, and the meniscus negative lens A1, the biconvex positive lens A2, the meniscus negative lens A3, the meniscus positive lens A4, the meniscus positive lens B1, the biconcave negative lens B2, and the biconvex positive lens B3 are f1, f2, f3, f4, f5, f6, and f7, respectively; wherein the following ratio is satisfied with the focal length f: -0.31< f1/f < -0.27;0.08< f2/f <0.12; -0.16< f3/f < -0.14;0.11< f4/f <0.14; 0.02< f5/f <0.05;0.01< f6/f <0.03;0.06< f7/f <0.09.
In this embodiment, f4 and f5 must satisfy 2.5< f4/f5<2.9.
In the present embodiment, the bonding surface of the meniscus negative lens A1 and the biconvex positive lens A2 is bent to the stop side, the bonding surface of the meniscus negative lens A3 and the meniscus positive lens A4 is bent to the stop side, and the bonding surface of the meniscus positive lens B1 and the biconcave negative lens B2 is bent to the stop side.
In this embodiment, each lens in the optical imaging system is a glass spherical lens.
In this embodiment, the first bonding group formed by the meniscus negative lens A1 and the biconvex positive lens A2 is made of a combination of a crown material and a flint material, the second bonding group formed by the meniscus negative lens A3 and the meniscus positive lens A4 is made of a combination of a crown material and a flint material, the third bonding group formed by the meniscus positive lens B1 and the biconcave negative lens B2 is made of a combination of a biconvex crown material, the first bonding group and the second bonding group are both made of a combination of a flint material and a crown material, the abbe number difference of the bonding groups is properly increased, the effect of balancing chromatic aberration can be achieved, and the bonding surface of the bonding group is controlled to bend to one side of the diaphragm, so that less large-angle beam aberration can be generated, and meanwhile, spherical aberration can be balanced.
In the embodiment, the zero parallax optical imaging system can be applied to a 2/3' chip, 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 0.05%, and the optical back focus is more than or equal to 29.2mm. The method is applicable to detection work of about 110mm object distance.
The object space telecentricity and the image space telecentricity of the optical system are close to zero, and the optical system has double telecentric zero parallax measurement capability and can form an equal-magnification image in a certain depth of field range; the optical image detection system reduces the sensitivity of the lenses by controlling the surface type bending degree of each lens, improving the refractive index and other methods, reduces the processing cost of the lenses and reduces the control difficulty of mechanical parts.
The optical system adopts a structure form of two double-gluing prepositions, can fully correct chromatic aberration introduced under large multiplying power and large visual field, effectively reduces total distortion of the system through modes of gap control, diaphragm position movement, focal power balance and the like, simultaneously converges incident chief rays and emergent chief rays, and enables the incident chief rays and the emergent chief rays to be fully parallel to an optical axis, so that zero parallax characteristic is realized.
The optical system can perform normal detection work in an environment without constant temperature by balancing the thermal expansion coefficient proportion of each material, and has stronger adaptability to the environment. The optical system meets the requirements of a bilateral telecentric system, and the principal rays of an object space and an image space are parallel to an optical axis, so that the multiplying power of the image detection method cannot be obviously changed due to defocusing of a measured object.
As can be seen from fig. 2, the values of the field transfer function are all close to the diffraction limit, so that a clear imaging effect can be ensured in the detection work.
An imaging method of a zero parallax optical imaging system comprises the following steps: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
In this embodiment, the individual lens parameters are as follows:
the foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A zero parallax optical imaging system, characterized by: the optical image detection system sequentially comprises a front group A, a diaphragm C and a rear group B, wherein the front group A, the diaphragm C and the rear group B are sequentially arranged along the direction from left to right, the front group A consists of a meniscus lens A1, a biconvex lens A2, a meniscus lens A3 and a meniscus lens A4, the meniscus lens A1, the biconcave lens B2 and the biconcave lens B3 are sequentially arranged, the meniscus lens A1 and the biconcave lens A2 are tightly connected to form a first gluing group, the meniscus lens A3 and the meniscus lens A4 are tightly connected to form a second gluing group, and the meniscus lens B1 and the biconcave lens B2 are tightly connected to form a third gluing group;
the focal length of the optical image detection system is f, and the meniscus negative lens A1, the biconvex positive lens A2, the meniscus negative lens A3, the meniscus positive lens A4, the meniscus positive lens B1, the biconcave negative lens B2 and the biconvex positive lens B3 are f1, f2, f3, f4, f5, f6 and f7 respectively; wherein the following ratio is satisfied with the focal length f: -0.31< f1/f < -0.27;0.08< f2/f <0.12; -0.16< f3/f < -0.14;0.11< f4/f <0.14; 0.02< f5/f <0.05;0.01< f6/f <0.03;0.06< f7/f <0.09; f4 and f5 must satisfy 2.5< f4/f5<2.9;
the individual lens parameters are as indicated above.
2. The zero parallax optical imaging system of claim 1, wherein: the air interval between the front group A and the rear group B is 73.2mm, the air interval between the biconvex positive lens A2 and the meniscus negative lens A3 is 1.5mm, the air interval between the meniscus positive lens A4 and the diaphragm C is 41.9mm, the air interval between the diaphragm C and the meniscus positive lens B1 is 31.3mm, the air interval between the biconcave negative lens B2 and the biconvex positive lens B3 is 26.1mm, and the air interval between the biconvex positive lens B3 and the imaging surface is 29.2mm.
3. The zero parallax optical imaging system of claim 1, wherein: the bonding surface of the meniscus negative lens A1 and the biconvex positive lens A2 is bent to the side of the diaphragm, the bonding surface of the meniscus negative lens A3 and the meniscus positive lens A4 is bent to the side of the diaphragm, and the bonding surface of the meniscus positive lens B1 and the biconcave negative lens B2 is bent to the side of the diaphragm.
4. The zero parallax optical imaging system of claim 1, wherein: each lens in the optical image detection system is a glass spherical lens.
5. The zero parallax optical imaging system of claim 4, wherein: the first bonding group formed by the meniscus negative lens A1 and the biconvex positive lens A2 adopts a combination of crown material and flint material, the second bonding group formed by the meniscus negative lens A3 and the meniscus positive lens A4 adopts a combination of crown material and flint material, and the third bonding group formed by the meniscus positive lens B1 and the biconcave negative lens B2 adopts a combination of double crown material.
6. A method for imaging a zero parallax optical imaging system, using the zero parallax optical imaging system according to any one of claims 1 to 4, characterized in that: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
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| CN201811388155.1A CN109298510B (en) | 2018-11-21 | 2018-11-21 | Zero parallax optical image detection system and imaging method |
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| CN201811388155.1A CN109298510B (en) | 2018-11-21 | 2018-11-21 | Zero parallax optical image detection system and imaging method |
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| CN109298510B true CN109298510B (en) | 2023-09-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106461919A (en) * | 2014-10-30 | 2017-02-22 | 奥林巴斯株式会社 | Objective optical system for endoscope |
| CN108388004A (en) * | 2018-03-26 | 2018-08-10 | 河南翊轩光电科技有限公司 | A kind of starlight grade high definition day and night confocal optics camera lens |
| CN108508581A (en) * | 2018-04-12 | 2018-09-07 | 浙江舜宇光学有限公司 | Optical imaging system |
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- 2018-11-21 CN CN201811388155.1A patent/CN109298510B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106461919A (en) * | 2014-10-30 | 2017-02-22 | 奥林巴斯株式会社 | Objective optical system for endoscope |
| CN108388004A (en) * | 2018-03-26 | 2018-08-10 | 河南翊轩光电科技有限公司 | A kind of starlight grade high definition day and night confocal optics camera lens |
| CN108508581A (en) * | 2018-04-12 | 2018-09-07 | 浙江舜宇光学有限公司 | Optical imaging system |
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