CN219302746U - High-resolution low-distortion machine vision lens - Google Patents
High-resolution low-distortion machine vision lens Download PDFInfo
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- CN219302746U CN219302746U CN202221199214.2U CN202221199214U CN219302746U CN 219302746 U CN219302746 U CN 219302746U CN 202221199214 U CN202221199214 U CN 202221199214U CN 219302746 U CN219302746 U CN 219302746U
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Abstract
The utility model provides a high-resolution low-distortion machine vision lens, which comprises a first lens group, a second lens group and a diaphragm positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm and consists of a first lens of a negative focal power meniscus, a second lens of positive focal power biconvex, a fourth lens of He Zhengguang focal power formed by a third lens group of negative focal power biconcave and a fifth lens; the second lens group is composed of a sixth lens of a negative power meniscus, seventh and eighth lenses of positive power, and a ninth lens of positive power biconvex. The lens adopts nine spherical lenses, the full-view field full-wave band modulation transfer function value is more than 0.3 under the condition that the Nyquist frequency is 100l p/mm, the imaging distortion is less than 0.1%, the lens has the characteristics of small F number, low distortion, high resolution and the like, the working wave band is 400nm-760nm, and the lens is very suitable for being integrated into a machine vision system, and can be applied to industrial lenses for detecting various small tablets with different sizes and various tiny objects with similar sizes.
Description
Technical Field
The utility model belongs to the technical field of optical imaging, and particularly relates to a high-resolution low-distortion machine vision lens.
Background
The machine vision detection technology has the advantages of high efficiency, non-contact, high accuracy and the like, and is applied to various industries of national economy. The optical lens is used as a main component of a machine vision system and plays a key role in subsequent detection.
At present, the machine vision lens used for detecting various small articles with tablets and similar sizes is less, the object distance is generally larger, the requirement on the position where a detected sample is placed is more strict, and the lens structure generally uses more than nine lenses, so that the lens structure is more complex, or the purpose of simple structure and high imaging quality is achieved by adopting an aspheric surface technology, but the cost and the process complexity of the whole lens are increased to a certain extent due to the large processing and detection difficulty of the aspheric surface lens.
Disclosure of Invention
The utility model provides a high-resolution low-distortion machine vision lens which can effectively solve the problems.
The utility model is realized in the following way:
a high resolution, low distortion machine vision lens comprises a first lens group with positive optical power, a second lens group with positive optical power and a diaphragm positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm and consists of a first lens with a meniscus with negative focal power, a biconvex second lens with positive focal power, a biconcave third lens with negative focal power, a fourth lens with positive focal power and a fifth lens with positive focal power; the second lens group is positioned behind the diaphragm and consists of a sixth lens with a meniscus with negative focal power, a seventh lens with positive focal power, an eighth lens with double convex positive focal power and a ninth lens with a meniscus with positive focal power.
The first lens is a meniscus negative lens with negative focal power and a concave surface facing an image surface, the second lens is a biconvex lens with positive focal power, the third lens is a biconcave lens with negative focal power, the fourth lens is a meniscus lens with positive focal power and a concave surface facing the image surface, the fifth lens is a meniscus negative lens with positive focal power, the sixth lens is a meniscus negative lens with negative focal power and a concave surface facing the image surface, the seventh lens is a meniscus lens with positive focal power, the eighth lens is a biconvex lens with positive focal power, and the ninth lens is a meniscus positive lens with positive focal power and a concave surface facing the image surface.
The second lens and the third lens group form a double-cemented lens, the fourth lens and the fifth lens form a double-cemented lens, and the seventh lens and the eighth lens form a double-cemented lens.
The air interval between the first lens and the second lens is 11.5 mm-12.5 mm, the air interval between the third lens and the fourth lens is 5.5 mm-6.5 mm, the air interval between the fifth lens and the diaphragm is 11.5 mm-12.5 mm, the air interval between the diaphragm and the sixth lens is 0.3 mm-1.3 mm, the air interval between the sixth lens and the seventh lens is 0.1 mm-1 mm, the air interval between the eighth lens and the ninth lens is 11.5 mm-12.5 mm, and the air interval between the ninth lens and the image plane is 15 mm-20 mm.
The focal length of the first lens is minus 335mm to minus 345mm; the focal length of the double-cemented lens formed by the second lens and the third lens is-2400 mm to-2800 mm; the focal length of the double-cemented lens formed by the fourth lens and the fifth lens is 50 mm-60 mm; the focal length of the sixth lens is-40 mm to-50 mm; the focal length of the double-cemented lens formed by the seventh lens and the eighth lens is 20 mm-30 mm; the focal length of the ninth lens is 140 mm-150 mm.
The effective focal length of the lens is 41mm, the relative numerical aperture F/2 is received by using a 1/1.8' CCD, the maximum caliber is smaller than 24mm, and the total optical length is 106.4mm from the first lens to the ninth lens;
the full field of view of the lens is 12.5 degrees; the working wave band is 400nm-760nm, preferably 450nm-700nm; the working distance is 60-80mm, preferably 70mm; the back intercept is 17.526mm, a C interface can be used.
The beneficial effects of the utility model are as follows: the lens adopts nine spherical lenses, the full-view field full-wave band modulation transfer function value is more than 0.3 under the condition that the Nyquist frequency is 100l p/mm, the imaging distortion is less than 0.1%, the lens has the characteristics of small F number, low distortion, high resolution and the like, the working wave band is 450nm-700nm, and the lens is very suitable for being integrated into a machine vision system, and can be applied to industrial lenses for detecting various small tablets with different sizes and various tiny objects with similar sizes.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an optical structure diagram of a high-image-quality and low-distortion machine vision lens provided by the utility model.
FIG. 2 is a light ray point column diagram of each view field with the height of 0, 1.35mm, 2.25mm, 3.15mm and 4.5mm on an image surface of the lens real image according to the utility model.
Fig. 3 is a transfer function MTF curve across the image planes of the fields of view of the lens of the present utility model.
Fig. 4 is a graph of curvature of field and distortion for a lens of the present utility model.
Fig. 5 is a vertical axis chromatic aberration diagram of the lens of the present utility model.
Fig. 6 is an axial chromatic aberration diagram of a lens of the present utility model.
Reference numerals:
a first lens-1; a second lens-2; a third lens-3; a fourth lens-4; a fifth lens-5; a diaphragm-6; a sixth lens-7; a seventh lens-8; an eighth lens-9; a ninth lens-10; image plane-11.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
In the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1-6, a high resolution, low distortion machine vision lens, comprises a first lens group with positive focal power, a second lens group with positive focal power and a diaphragm 6 positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm 6 and consists of a first lens 1 with a meniscus with negative focal power, a biconvex second lens 2 with positive focal power, a biconcave third lens 3 with negative focal power, a fourth lens 4 with positive focal power and a fifth lens 5 with positive focal power; the second lens group is located behind the stop 6 and is composed of a sixth lens 7 having a meniscus with negative optical power, a seventh lens 8 having positive optical power, an eighth lens 9 having positive optical power and biconvex, and a ninth lens 10 having a meniscus with positive optical power.
The first lens 1 is a meniscus negative lens with negative focal power and a concave surface facing an image surface, the second lens 2 is a biconcave lens with positive focal power, the third lens 3 is a biconcave lens with negative focal power, the fourth lens 4 is a meniscus lens with positive focal power and a concave surface facing the image surface, the fifth lens 5 is a meniscus lens with positive focal power, the sixth lens 7 is a meniscus negative lens with negative focal power and a concave surface facing the image surface, the seventh lens 8 is a meniscus lens with positive focal power, the eighth lens 9 is a biconcave lens with positive focal power, and the ninth lens 10 is a meniscus positive lens with positive focal power and a concave surface facing the image surface.
The second lens 2 and the third lens 3 form a double-cemented lens, the fourth lens 4 and the fifth lens 5 form a double-cemented lens, and the seventh lens 8 and the eighth lens 9 form a double-cemented lens.
The air interval between the first lens 1 and the second lens 2 is 11.5 mm-12.5 mm, the air interval between the third lens 3 and the fourth lens 4 is 5.5 mm-6.5 mm, the air interval between the fifth lens 5 and the diaphragm 6 is 11.5 mm-12.5 mm, the air interval between the diaphragm 6 and the sixth lens 7 is 0.3 mm-1.3 mm, the air interval between the sixth lens 7 and the seventh lens 8 is 0.1 mm-1 mm, the air interval between the eighth lens 9 and the ninth lens 10 is 11.5 mm-12.5 mm, and the air interval between the ninth lens 10 and the image surface 11 is 15 mm-20 mm.
The focal length of the first lens 1 is minus 335mm to minus 345mm; the focal length of the double-cemented lens formed by the second lens 2 and the third lens 3 is-2400 mm to-2800 mm, and is better to be-2400 mm to-2410 mm; the focal length of the double-cemented lens formed by the fourth lens 4 and the fifth lens 5 is 50 mm-60 mm; the focal length of the sixth lens 7 is-40 mm to-50 mm; the focal length of the double-cemented lens formed by the seventh lens 8 and the eighth lens 9 is 20 mm-30 mm; the focal length of the ninth lens 10 is 140mm to 150mm.
The effective focal length of the lens is 41mm, the relative numerical aperture F/2 is received by using a 1/1.8' CCD, the maximum caliber is smaller than 24mm, and the total optical length is 106.4mm from the first lens 1 to the ninth lens 10;
the full field of view of the lens is 12.5 degrees; the working wave band is 400nm-760nm, preferably 450nm-700nm; the working distance is 60-80mm, preferably 70mm; the back intercept is 17.526mm, a C interface can be used.
Example 1
A high resolution, low distortion machine vision lens comprises a first lens group with positive optical power, a second lens group with positive optical power and a diaphragm 6 positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm 6 and consists of a double cemented lens consisting of a first lens 1 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a second lens 2 of a biconvex lens with positive focal power, a third lens 3 of a biconcave lens with negative focal power, and a fourth lens 4 of a meniscus lens with positive focal power and a concave surface facing the image surface, and a fifth lens 5 of a meniscus lens with positive focal power; the air interval between the first lens 1 and the second lens 2 is 11.9mm, the air interval between the third lens 3 and the fourth lens 4 is 5.9mm, and the air interval between the fifth lens 5 and the diaphragm 6 is 12.0mm; the focal length of the first lens 1 is-341.9 mm; the focal length of the double-cemented lens formed by the second lens 2 and the third lens 3 is-2426.4 mm; the focal length of the double-cemented lens formed by the fourth lens 4 and the fifth lens 5 is 52.9mm;
the second lens group is positioned behind the diaphragm 6 and consists of a sixth lens 7 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a seventh lens 8 of a meniscus lens with positive focal power, a double-cemented lens consisting of an eighth lens 9 of a biconvex lens with positive focal power and a ninth lens 10 of a meniscus positive lens with positive focal power and a concave surface facing the image surface; the air space between the diaphragm 6 and the sixth lens 7 is 0.6mm, the air space between the sixth lens 7 and the seventh lens 8 is 0.7mm, the air space between the eighth lens 9 and the ninth lens 10 is 12.1mm, and the air space between the ninth lens 10 and the image plane 11 is 17.5mm. The focal length of the sixth lens 7 is-43.1 mm; the focal length of the double-cemented lens consisting of the seventh lens 8 and the eighth lens 9 is 24.6mm; the focal length of the ninth lens 10 is 142.5mm.
The effective focal length of the lens is 41mm, the relative numerical aperture F/2 is received by using a 1/1.8' CCD, the maximum caliber is smaller than 23.2mm, and the total optical length is 106.4mm from the first lens 1 to the ninth lens 10; the full field of view of the lens is 12.5 degrees; the working wave band is 400nm-760nm, preferably 450nm-700nm; the working distance is 60-80mm, preferably 70mm; the back intercept is 17.526mm, a C interface can be used.
Example 2
A high resolution, low distortion machine vision lens comprises a first lens group with positive optical power, a second lens group with positive optical power and a diaphragm 6 positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm 6 and consists of a double cemented lens consisting of a first lens 1 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a second lens 2 of a biconvex lens with positive focal power, a third lens 3 of a biconcave lens with negative focal power, and a fourth lens 4 of a meniscus lens with positive focal power and a concave surface facing the image surface, and a fifth lens 5 of a meniscus lens with positive focal power; the air interval between the first lens 1 and the second lens 2 is 11.9mm, the air interval between the third lens 3 and the fourth lens 4 is 5.9mm, and the air interval between the fifth lens 5 and the diaphragm 6 is 12.0mm; the focal length of the first lens 1 is-340.2 mm; the focal length of the double-cemented lens formed by the second lens 2 and the third lens 3 is-2637.3 mm; the focal length of the double-cemented lens formed by the fourth lens 4 and the fifth lens 5 is 53mm;
the second lens group is positioned behind the diaphragm 6 and consists of a sixth lens 7 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a seventh lens 8 of a meniscus lens with positive focal power, a double-cemented lens consisting of an eighth lens 9 of a biconvex lens with positive focal power and a ninth lens 10 of a meniscus positive lens with positive focal power and a concave surface facing the image surface; the air space between the diaphragm 6 and the sixth lens 7 is 0.5mm, the air space between the sixth lens 7 and the seventh lens 8 is 0.7mm, the air space between the eighth lens 9 and the ninth lens 10 is 12.2mm, and the air space between the ninth lens 10 and the image plane 11 is 17.5mm. The focal length of the sixth lens 7 is-43.1 mm; the focal length of the double-cemented lens consisting of the seventh lens 8 and the eighth lens 9 is 24.7mm; the focal length of the ninth lens 10 is 141.7mm.
The effective focal length of the lens is 41mm, the relative numerical aperture F/2 is received by using a 1/1.8' CCD, the maximum caliber is smaller than 24mm, and the total optical length is 106.4mm from the first lens 1 to the ninth lens 10; the full field of view of the lens is 12.5 degrees; the working wave band is 400nm-760nm, preferably 450nm-700nm; the working distance is 60-80mm, preferably 70mm; the back intercept is 17.526mm, a C interface can be used.
Example 3
A high resolution, low distortion machine vision lens comprises a first lens group with positive optical power, a second lens group with positive optical power and a diaphragm 6 positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm 6 and consists of a double cemented lens consisting of a first lens 1 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a second lens 2 of a biconvex lens with positive focal power, a third lens 3 of a biconcave lens with negative focal power, and a fourth lens 4 of a meniscus lens with positive focal power and a concave surface facing the image surface, and a fifth lens 5 of a meniscus lens with positive focal power; the air interval between the first lens 1 and the second lens 2 is 11.9mm, the air interval between the third lens 3 and the fourth lens 4 is 5.9mm, and the air interval between the fifth lens 5 and the diaphragm 6 is 12.0mm; the focal length of the first lens 1 is-340.5 mm; the focal length of the double-cemented lens formed by the second lens 2 and the third lens 3 is-2754.2 mm; the focal length of the double-cemented lens formed by the fourth lens 4 and the fifth lens 5 is 53mm;
the second lens group is positioned behind the diaphragm 6 and consists of a sixth lens 7 of a meniscus negative lens with negative focal power and a concave surface facing the image surface, a seventh lens 8 of a meniscus lens with positive focal power, a double-cemented lens consisting of an eighth lens 9 of a biconvex lens with positive focal power and a ninth lens 10 of a meniscus positive lens with positive focal power and a concave surface facing the image surface; the air space between the diaphragm 6 and the sixth lens 7 is 0.6mm, the air space between the sixth lens 7 and the seventh lens 8 is 0.7mm, the air space between the eighth lens 9 and the ninth lens 10 is 12.1mm, and the air space between the ninth lens 10 and the image plane 11 is 17.5mm. The focal length of the sixth lens 7 is-43.1 mm; the focal length of the double-cemented lens consisting of the seventh lens 8 and the eighth lens 9 is 24.7mm; the focal length of the ninth lens 10 is 141.7mm.
The effective focal length of the lens is 41mm, the relative numerical aperture F/2 is received by using a 1/1.8' CCD, the maximum caliber is smaller than 24mm, and the total optical length is 106.4mm from the first lens 1 to the ninth lens 10; the full field of view of the lens is 12.5 degrees; the working wave band is 400nm-760nm, preferably 450nm-700nm; the working distance is 60-80mm, preferably 70mm; the back intercept is 17.526mm, a C interface can be used. The actual lens parameters and lens center thickness parameters are shown in table 1 below:
TABLE 1
As can be seen from fig. 2, the root mean square radius of the dot column at each view is less than 7.5um.
In FIG. 3, the MTF value of each view field is larger than 0.3 at 100l p/mm, and the curve is smooth and compact, which shows that the lens has clear and uniform imaging, and the system has good imaging quality in the full-band and full-view field.
As can be seen from FIG. 4, the lens field curvature is smaller than 0.2mm, the distortion is smaller than 0.1%, the system is low in distortion and low in distortion, and the measured result can be more accurate.
As can be seen from fig. 5, the lateral chromatic aberration is all within the airy spot range, and has little influence on the imaging result.
It can be seen from fig. 6 that the maximum focus offset is 104.00um in the wavelength range of 450nm to 700 nm.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. A high resolution, low distortion machine vision lens comprising a first lens group having positive optical power, a second lens group having positive optical power, and a stop positioned between the first lens group and the second lens group; the first lens group is positioned in front of the diaphragm and consists of a first lens with a meniscus with negative focal power, a biconvex second lens with positive focal power, a biconcave third lens with negative focal power, a fourth lens with positive focal power and a fifth lens with positive focal power; the second lens group is positioned behind the diaphragm and consists of a sixth lens with a meniscus with negative focal power, a seventh lens with positive focal power, an eighth lens with double convex positive focal power and a ninth lens with a meniscus with positive focal power.
2. The high resolution, low distortion machine vision lens of claim 1, wherein the first lens is a negative meniscus lens having negative optical power and concave surface facing the image surface, the second lens is a biconvex lens having positive optical power, the third lens is a biconcave lens having negative optical power, the fourth lens is a meniscus lens having positive optical power and concave surface facing the image surface, the fifth lens is a negative meniscus lens having negative optical power and concave surface facing the image surface, the seventh lens is a meniscus lens having positive optical power, the eighth lens is a biconvex lens having positive optical power, and the ninth lens is a positive meniscus lens having positive optical power and concave surface facing the image surface.
3. The high resolution, low distortion machine vision lens of claim 2, wherein the second lens and third lens group form a doublet lens, the fourth lens and fifth lens form a doublet lens, and the seventh lens and eighth lens form a doublet lens.
4. The high resolution, low distortion machine vision lens of claim 2, wherein the air gap between the first and second lenses is 11.5mm to 12.5mm, the air gap between the third and fourth lenses is 5.5mm to 6.5mm, the air gap between the fifth and diaphragm is 11.5mm to 12.5mm, the air gap between the diaphragm and sixth lens is 0.3mm to 1.3mm, the air gap between the sixth and seventh lenses is 0.1mm to 1mm, the air gap between the eighth and ninth lenses is 11.5mm to 12.5mm, and the air gap between the ninth and image plane is 15mm to 20mm.
5. The high resolution, low distortion machine vision lens of claim 1 or 4, wherein the focal length of the first lens is-335 mm to-345 mm; the focal length of the double-cemented lens formed by the second lens and the third lens is-2400 mm to-2800 mm; the focal length of the double-cemented lens formed by the fourth lens and the fifth lens is 50 mm-60 mm; the focal length of the sixth lens is-40 mm to-50 mm; the focal length of the double-cemented lens formed by the seventh lens and the eighth lens is 20 mm-30 mm; the focal length of the ninth lens is 140 mm-150 mm.
6. A high resolution, low distortion machine vision lens as set forth in any of claims 1-4, wherein the full field of view of the lens is 12.5 ° and the operating band is 400nm-760nm.
7. A high resolution, low distortion machine vision lens as set forth in claim 6, wherein the working distance of the lens is 60-80mm; the rear intercept of the lens is 17.526mm.
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| CN202221199214.2U CN219302746U (en) | 2022-05-18 | 2022-05-18 | High-resolution low-distortion machine vision lens |
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