CN215813531U - Short-focus wide-working-distance machine vision lens - Google Patents
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- CN215813531U CN215813531U CN202122352770.0U CN202122352770U CN215813531U CN 215813531 U CN215813531 U CN 215813531U CN 202122352770 U CN202122352770 U CN 202122352770U CN 215813531 U CN215813531 U CN 215813531U
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Abstract
The utility model relates to a short-focus wide-working-distance machine vision lens, wherein an optical system of the lens comprises a front lens group A, a diaphragm, a rear lens group B and protective lenses which are sequentially arranged from left to right along light rays, wherein the front lens group A comprises a positive meniscus lens A-1, a negative meniscus lens A-2, a double-concave negative lens A-3 and a double-convex positive lens A-4 which are sequentially arranged from left to right along light rays; the rear lens group B comprises a biconvex positive lens B-1, a biconvex positive lens B-2, a biconcave negative lens B-3, a meniscus positive lens B-4, a meniscus negative lens B-5 and a biconvex positive lens B-6 which are sequentially arranged from left to right along light rays, wherein the biconvex positive lens B-2 and the biconcave negative lens B-3 are tightly connected to form a gluing group. The camera lens has the advantages that the camera lens is provided with ten full spherical lenses, has a compact optical structure, adopts the floating focusing of the rear lens group, cooperates with the work of the system under different working distances by controlling the movement of the rear lens group relative to the front lens group, has good visible light wave band imaging quality, and is suitable for machine vision lenses with higher quality requirements.
Description
The technical field is as follows:
the utility model relates to a short-focus wide-working-distance machine vision lens.
Background art:
machine vision image acquisition equipment is divided into a linear array type and a planar array type according to the types of chips, and the planar array type camera is widely applied at present. Area-array cameras are generally used to monitor, detect, at a fixed location, objects within a specific range; with the development of chip technology, the detection level is improved, and higher requirements are put forward on a machine vision lens; the development trend is small occupied space, large supporting target surface, low distortion and high image quality.
The resolution of a traditional machine vision lens is about two million pixels, the definition is insufficient, the working distance range of clear imaging is short, and the total length is relatively long; the focal length is generally over 12mm, the visual field is narrow, and the requirements of the consumer market on large visual field and ultra-high definition cannot be met.
The utility model has the following contents:
the utility model is to provide a short-focus wide-working-distance machine vision lens, which solves the technical problem of the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that: a short-focus wide-working-distance machine vision lens comprises an optical system, a front lens group A, a diaphragm, a rear lens group B and protective lenses, wherein the front lens group A, the diaphragm, the rear lens group B and the protective lenses are sequentially arranged from left to right along light rays, and the front lens group A comprises a positive meniscus lens A-1, a negative meniscus lens A-2, a double-concave negative lens A-3 and a double-convex positive lens A-4 which are sequentially arranged from left to right along light rays; the rear lens group B comprises a biconvex positive lens B-1, a biconvex positive lens B-2, a biconcave negative lens B-3, a meniscus positive lens B-4, a meniscus negative lens B-5 and a biconvex positive lens B-6 which are sequentially arranged from left to right along light rays, and the biconvex positive lens B-2 and the biconcave negative lens B-3 are closely connected to form a gluing group.
Further, the air space between the positive meniscus lens A-1 and the negative meniscus lens A-2 is 0.2mm, the air space between the negative meniscus lens A-2 and the double-concave negative lens A-3 is 3.58mm, and the air space between the double-concave negative lens A-3 and the double-convex positive lens A-4 is 4.12 mm; the air space between the biconvex positive lens B-1 and the biconvex positive lens B-2 is 3.24mm, the air space between the biconcave negative lens B-3 and the meniscus positive lens B-4 is 1.81mm, the air space between the meniscus positive lens B-4 and the meniscus negative lens B-5 is 1.29mm, and the air space between the meniscus negative lens B-5 and the biconvex positive lens B-6 is 0.2 mm.
Further, the rear lens group B is a floating focusing group.
Further, under the condition that the reference working distance is 400mm, the air space between the double-convex positive lens A-4 and the double-convex positive lens B-1 is 9.68 mm; the air space between the biconvex positive lens B-6 and the protective lens is 10.5mm, and the air space between the protective lens and the image plane is 0.1 mm.
Further, the positive meniscus lens A-1, the negative meniscus lens A-2, the negative biconcave lens A-3, the positive biconvex lens A-4, the positive biconvex lens B-1, the positive biconvex lens B-2, the negative biconcave lens B-3, the positive meniscus lens B-4, the negative meniscus lens B-5 and the positive biconvex lens B-6 are all glass spherical lenses.
Further, in the front lens group A, the outer diameters of the positive meniscus lens A-1, the negative meniscus lens A-2, the double concave negative lens A-3 and the double convex positive lens A-4 are sequentially decreased; in the rear lens group B, the outer diameters of the biconvex positive lens B-1, the biconvex positive lens B-2, the biconcave negative lens B-3, the meniscus positive lens B-4, the meniscus negative lens B-5 and the biconvex positive lens B-6 are sequentially increased in an increasing manner.
Further, the focal length of the positive meniscus lens a-1 is f1, the focal length of the negative meniscus lens a-2 is f2, the focal length of the negative biconcave lens a-3 is f3, the focal length of the positive biconvex lens a-4 is f4, the focal length of the positive biconvex lens B-1 is f5, the focal length of the positive biconvex lens B-2 is f6, the focal length of the negative biconcave lens B-3 is f7, the focal length of the positive meniscus lens B-4 is f8, the focal length of the negative meniscus lens B-5 is f9, and the focal length of the positive biconvex lens B-6 is f10, where the focal lengths of the lenses satisfy the following relations: f1 is more than or equal to 35 and less than or equal to 39; f2 is more than or equal to-27 and less than or equal to-24; -13 is less than or equal to f3 is less than or equal to-10; f4 is more than or equal to 19 and less than or equal to 22; f5 is more than or equal to 15 and less than or equal to 20; f6 is more than or equal to 10 and less than or equal to 15; f7 is more than or equal to-11 and less than or equal to-6; f8 is more than or equal to 30 and less than or equal to 33; f9 is more than or equal to minus 36 and less than or equal to minus 32; f10 is more than or equal to 14 and less than or equal to 17.
Further, the central thickness of the positive meniscus lens a-1 is 2.93mm, the central thickness of the negative meniscus lens a-2 is 1.2mm, the central thickness of the negative biconcave lens a-3 is 1.2mm, the central thickness of the positive biconvex lens a-4 is 1.89mm, the central thickness of the positive biconvex lens B-1 is 1.97mm, the central thickness of the positive biconvex lens B-2 is 2.63mm, the central thickness of the negative biconcave lens B-3 is 1.2mm, the central thickness of the positive meniscus lens B-4 is 1.77mm, the central thickness of the negative meniscus lens B-5 is 1.2mm, the central thickness of the positive biconvex lens B-6 is 3.30mm, and the central thickness of the protective spectacle lens is 1 mm.
Furthermore, the refractive index of the positive meniscus lens A-1, the positive biconvex lens B-1, the positive meniscus lens B-4 and the positive biconvex lens B-6 is n1, the Abbe number is v1, and the relations are satisfied, wherein n1 is greater than or equal to 1.7 and is less than or equal to 1.8, and v1 is greater than or equal to 52 and is less than or equal to 53; the refractive index of the meniscus negative lens A-2 is n2, the Abbe number is v2, and the relation is satisfied: n2 is more than or equal to 1.6 and less than or equal to 1.7, and v2 is more than or equal to 54 and less than or equal to 55; the refractive index of the double-concave negative lens A-3 is n3, the Abbe number is v3, and the relation is satisfied: n3 is more than or equal to 1.7 and less than or equal to 1.8, and v3 is more than or equal to 52 and less than or equal to 53; the refractive index of the biconvex positive lens A-4 is n4, the Abbe number is v4, and the relation is satisfied: n4 is more than or equal to 1.7 and less than or equal to 1.8, and v4 is more than or equal to 29 and less than or equal to 30; the refractive index of the biconvex positive lens B-2 is n5, the Abbe number is v5, and the relation is satisfied: n5 is more than or equal to 1.5 and less than or equal to 1.6, and v5 is more than or equal to 67 and less than or equal to 68; the refractive index of the double-concave negative lens B-3 is n6, the Abbe number is v6, and the relation is satisfied: n6 is more than or equal to 1.7 and less than or equal to 1.8, and v6 is more than or equal to 27 and less than or equal to 28; the refractive index of the meniscus negative lens B-5 is n7, the Abbe number is v7, and the relation is satisfied: n7 is more than or equal to 1.6 and less than or equal to 1.7, and v7 is more than or equal to 36 and less than or equal to 37; the refractive index of the parallel plate C-1 is n8, the Abbe number is v8, and the relation is satisfied: n8 is more than or equal to 1.5 and less than or equal to 1.6, and v8 is more than or equal to 64 and less than or equal to 65.
Furthermore, the working distance of the lens is 100mm to infinity, the diaphragm and the front lens group A are kept still in the focusing process, and the distance range of the rear lens group B moving relative to the front lens group A is 0 to 1.45 mm.
Compared with the prior art, the utility model has the following effects: the utility model uses ten full spherical lenses, has a compact optical structure, when the F number is not less than 2.3, the focal length of the lens is not less than 12mm, the working distance is 100mm to infinity, the rear lens group is adopted for floating focusing, the rear lens group is controlled to move relative to the front lens group to match the system to work under different working distances, the distortion under the optimal object distance is less than 0.5 percent, the relative illumination is more than 76 percent, the MTF at the Nyquist frequency is more than 0.3, the utility model is adapted to a photosensitive chip of 2/3 inches, the visible light waveband imaging quality is good, and the utility model is suitable for machine vision lenses with higher quality requirements.
Description of the drawings:
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of MTF performance at a working distance of 400mm according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of MTF performance at a working distance of 100mm according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of MTF performance at infinite working distance according to an embodiment of the present invention;
FIG. 5 is a graph of relative illuminance at infinity working distance for an embodiment of the present invention;
FIG. 6 is a diagram illustrating distortion performance at different working distances according to an embodiment of the present invention;
fig. 7 is a diagram of a dot arrangement at an infinite working distance in accordance with an embodiment of the present invention.
In the figure:
1-meniscus positive lens a-1; 2-meniscus negative lens a-2; 3-biconcave negative lens A-3; 4-biconvex positive lens a-4; 5-biconvex positive lens B-1; 6-biconvex positive lens B-2; 7-biconcave negative lens B-3; 8-meniscus positive lens B-4; 9-meniscus negative lens B-5; 10-biconvex positive lens B-6; 11-a diaphragm; 12-protective lens.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, an optical system of the machine vision lens with short focal length and wide working distance of the present invention includes a front lens group a, a diaphragm, a rear lens group B and a protection lens, which are sequentially arranged from left to right along light, wherein the front lens group a includes a positive meniscus lens a-1, a negative meniscus lens a-2, a negative biconcave lens a-3 and a positive biconvex lens a-4, which are sequentially arranged from left to right along light; the rear lens group B comprises a biconvex positive lens B-1, a biconvex positive lens B-2, a biconcave negative lens B-3, a meniscus positive lens B-4, a meniscus negative lens B-5 and a biconvex positive lens B-6 which are arranged along light rays from left to right in sequence, and the biconvex positive lens B-2 and the biconcave negative lens B-3 are tightly connected to form a bonding group; the protective lens is positioned at the front end of the photosensitive chip of the lens.
In this embodiment, the air space between the positive meniscus lens a-1 and the negative meniscus lens a-2 is 0.2mm, the air space between the negative meniscus lens a-2 and the double concave negative lens a-3 is 3.58mm, and the air space between the double concave negative lens a-3 and the double convex positive lens a-4 is 4.12 mm; the air space between the biconvex positive lens B-1 and the biconvex positive lens B-2 is 3.24mm, the air space between the biconcave negative lens B-3 and the meniscus positive lens B-4 is 1.81mm, the air space between the meniscus positive lens B-4 and the meniscus negative lens B-5 is 1.29mm, and the air space between the meniscus negative lens B-5 and the biconvex positive lens B-6 is 0.2 mm.
In this embodiment, the rear lens group B is a floating focusing group, and the rear lens group B is controlled to move relative to the front lens group a to cooperate with the optical system of the lens to work at different working distances. The working distance of the lens is 100mm to infinity, the diaphragm and the front lens group A are kept still in the focusing process, and the distance range of the rear lens group B moving relative to the front lens group A is 0 to 1.45 mm.
In the embodiment, under the condition that the reference working distance is 400mm, the air space between the biconvex positive lens a-4 and the biconvex positive lens B-1 is 9.68 mm; it should be noted that, at different working distances, the air space between the biconvex positive lens a-4 and the biconvex positive lens B-1 changes by focusing through the rear lens group B.
In this embodiment, under the condition that the reference working distance is 400mm, the air space between the biconvex positive lens B-6 and the protective lens is 10.5 mm; it should be noted that the air space between the biconvex positive lens B-6 and the protective lens changes when focusing is performed by the rear lens group B at different working pitches.
In this embodiment, the air space between the protection lens and the image plane is 0.1mm, and the protection lens is a parallel plate.
In this embodiment, the positive meniscus lens a-1, the negative meniscus lens a-2, the negative biconcave lens a-3, the positive biconvex lens a-4, the positive biconvex lens B-1, the positive biconvex lens B-2, the negative biconcave lens B-3, the positive meniscus lens B-4, the negative meniscus lens B-5, and the positive biconvex lens B-6 are all glass spherical lenses. In the front lens group A, the outer diameters of the positive meniscus lens A-1, the negative meniscus lens A-2, the double-concave negative lens A-3 and the double-convex positive lens A-4 are sequentially decreased; in the rear lens group B, the outer diameters of the biconvex positive lens B-1, the biconvex positive lens B-2, the biconcave negative lens B-3, the meniscus positive lens B-4, the meniscus negative lens B-5 and the biconvex positive lens B-6 are sequentially increased in an increasing manner.
In this embodiment, the focal length of the positive meniscus lens a-1 is f1, the focal length of the negative meniscus lens a-2 is f2, the focal length of the negative biconcave lens a-3 is f3, the focal length of the positive biconvex lens a-4 is f4, the focal length of the positive biconvex lens B-1 is f5, the focal length of the positive biconvex lens B-2 is f6, the focal length of the negative biconcave lens B-3 is f7, the focal length of the positive meniscus lens B-4 is f8, the focal length of the negative meniscus lens B-5 is f9, and the focal length of the positive biconvex lens B-6 is f10, where the focal lengths of the lenses satisfy the following relations: f1 is more than or equal to 35 and less than or equal to 39; f2 is more than or equal to-27 and less than or equal to-24; -13 is less than or equal to f3 is less than or equal to-10; f4 is more than or equal to 19 and less than or equal to 22; f5 is more than or equal to 15 and less than or equal to 20; f6 is more than or equal to 10 and less than or equal to 15; f7 is more than or equal to-11 and less than or equal to-6; f8 is more than or equal to 30 and less than or equal to 33; f9 is more than or equal to minus 36 and less than or equal to minus 32; f10 is more than or equal to 14 and less than or equal to 17.
In this embodiment, the central thickness of the positive meniscus lens a-1 is 2.93mm, the central thickness of the negative meniscus lens a-2 is 1.2mm, the central thickness of the negative biconcave lens a-3 is 1.2mm, the central thickness of the positive biconvex lens a-4 is 1.89mm, the central thickness of the positive biconvex lens B-1 is 1.97mm, the central thickness of the positive biconvex lens B-2 is 2.63mm, the central thickness of the negative biconcave lens B-3 is 1.2mm, the central thickness of the positive meniscus lens B-4 is 1.77mm, the central thickness of the negative meniscus lens B-5 is 1.2mm, the central thickness of the positive biconvex lens B-6 is 3.30mm, and the central thickness of the protective spectacle lens is 1 mm.
In the embodiment, the refractive indexes of the positive meniscus lens A-1, the double-convex positive lens B-1, the positive meniscus lens B-4 and the double-convex positive lens B-6 are n1, the Abbe number is v1, and the relations of n1 being more than or equal to 1.8 and v1 being more than or equal to 52 and less than or equal to 53 are satisfied; the refractive index of the meniscus negative lens A-2 is n2, the Abbe number is v2, and the relation is satisfied: n2 is more than or equal to 1.6 and less than or equal to 1.7, and v2 is more than or equal to 54 and less than or equal to 55; the refractive index of the double-concave negative lens A-3 is n3, the Abbe number is v3, and the relation is satisfied: n3 is more than or equal to 1.7 and less than or equal to 1.8, and v3 is more than or equal to 52 and less than or equal to 53; the refractive index of the biconvex positive lens A-4 is n4, the Abbe number is v4, and the relation is satisfied: n4 is more than or equal to 1.7 and less than or equal to 1.8, and v4 is more than or equal to 29 and less than or equal to 30; the refractive index of the biconvex positive lens B-2 is n5, the Abbe number is v5, and the relation is satisfied: n5 is more than or equal to 1.5 and less than or equal to 1.6, and v5 is more than or equal to 67 and less than or equal to 68; the refractive index of the double-concave negative lens B-3 is n6, the Abbe number is v6, and the relation is satisfied: n6 is more than or equal to 1.7 and less than or equal to 1.8, and v6 is more than or equal to 27 and less than or equal to 28; the refractive index of the meniscus negative lens B-5 is n7, the Abbe number is v7, and the relation is satisfied: n7 is more than or equal to 1.6 and less than or equal to 1.7, and v7 is more than or equal to 36 and less than or equal to 37; the refractive index of the parallel plate C-1 is n8, the Abbe number is v8, and the relation is satisfied: n8 is more than or equal to 1.5 and less than or equal to 1.6, and v8 is more than or equal to 64 and less than or equal to 65.
In this embodiment, each lens needs to satisfy the parameter requirements shown in table 1.
Table 1 shows the parameters of the lens at 400mm working distance
In this embodiment, the focusing movement distances at different working distances need to satisfy the parameter requirements shown in table 2.
TABLE 2 FOCUSING-MOVING DISTANCE PARAMETERS FOR DIFFERENT WORKING DISTANCES
In this embodiment, the lens achieves the following optical indexes:
(1) the working distance range of the lens is 100mm to infinity;
(2) the lens can be matched with the photosensitive chip of the 2/3-inch target surface at maximum;
(3) the focal length of the lens is 12mm, the total optical length is 55mm, and the volume is small;
(4) the MTF of the lens is larger than 0.3 at the 145lp/mm line pair, so that a high-definition image can be provided;
(5) the number of the image space F is 2.3, and the relative illumination is more than 76% in the working distance range;
(6) distortion at the optimum object distance is less than 0.5%;
(7) the maximum image surface is phi 11.4 mm;
(8) CRA is less than 5 °.
In this embodiment, as shown in fig. 2-7, the MTF is above 0.3 at 145lp/mm line pair at 100, 400 and infinite working distance; the relative illumination is greater than 76%; maximum distortion of less than 1.5%; the RMS radius of the point list is not more than 3.1um, so the optical system meets the image quality requirement of a machine vision lens.
The utility model has the advantages that: the optical lens is compact in optical structure, when the F number is not less than 2.3, the focal length of the lens is not less than 12mm, the working distance is 100 mm-infinity, the rear group is adopted for floating focusing, the rear group is controlled to move relative to the front group to match the system to work under different working distances, the distortion under the optimal object distance is less than 0.5%, the relative illumination is greater than 76%, the MTF under the 145 line pair is greater than 0.3, the optical lens can be adapted to 2/3 inches of photosensitive chips (the effective target surface is phi 11.4 mm), the imaging quality of a visible light wave band is good, and the optical lens is suitable for machine vision lenses with higher quality requirements.
If the utility model discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.
Claims (10)
1. A short-focus wide-working-distance machine vision lens is characterized in that: the optical system of the lens comprises a front lens group A, a diaphragm, a rear lens group B and protective lenses which are sequentially arranged from left to right along light rays, wherein the front lens group A comprises a positive meniscus lens A-1, a negative meniscus lens A-2, a double-concave negative lens A-3 and a double-convex positive lens A-4 which are sequentially arranged from left to right along light rays; the rear lens group B comprises a biconvex positive lens B-1, a biconvex positive lens B-2, a biconcave negative lens B-3, a meniscus positive lens B-4, a meniscus negative lens B-5 and a biconvex positive lens B-6 which are sequentially arranged from left to right along light rays, and the biconvex positive lens B-2 and the biconcave negative lens B-3 are closely connected to form a gluing group.
2. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: the air space between the positive meniscus lens A-1 and the negative meniscus lens A-2 is 0.2mm, the air space between the negative meniscus lens A-2 and the double-concave negative lens A-3 is 3.58mm, and the air space between the double-concave negative lens A-3 and the double-convex positive lens A-4 is 4.12 mm; the air space between the biconvex positive lens B-1 and the biconvex positive lens B-2 is 3.24mm, the air space between the biconcave negative lens B-3 and the meniscus positive lens B-4 is 1.81mm, the air space between the meniscus positive lens B-4 and the meniscus negative lens B-5 is 1.29mm, and the air space between the meniscus negative lens B-5 and the biconvex positive lens B-6 is 0.2 mm.
3. A short focal length wide working distance machine vision lens as claimed in claim 1 or 2, characterized in that: the rear lens group B is a floating focusing group.
4. A short focal length wide working distance machine vision lens as claimed in claim 3, characterized in that: under the condition that the reference working distance is 400mm, the air space between the double-convex positive lens A-4 and the double-convex positive lens B-1 is 9.68 mm; the air space between the biconvex positive lens B-6 and the protective lens is 10.5mm, and the air space between the protective lens and the image plane is 0.1 mm.
5. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: the positive meniscus lens A-1, the negative meniscus lens A-2, the double-concave negative lens A-3, the double-convex positive lens A-4, the double-convex positive lens B-1, the double-convex positive lens B-2, the double-concave negative lens B-3, the positive meniscus lens B-4, the negative meniscus lens B-5 and the double-convex positive lens B-6 are all glass spherical lenses.
6. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: in the front lens group A, the outer diameters of the positive meniscus lens A-1, the negative meniscus lens A-2, the double-concave negative lens A-3 and the double-convex positive lens A-4 are sequentially decreased; in the rear lens group B, the outer diameters of the biconvex positive lens B-1, the biconvex positive lens B-2, the biconcave negative lens B-3, the meniscus positive lens B-4, the meniscus negative lens B-5 and the biconvex positive lens B-6 are sequentially increased in an increasing manner.
7. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: the focal length of the positive meniscus lens A-1 is f1, the focal length of the negative meniscus lens A-2 is f2, the focal length of the negative biconcave lens A-3 is f3, the focal length of the positive biconvex lens A-4 is f4, the focal length of the positive biconvex lens B-1 is f5, the focal length of the positive biconvex lens B-2 is f6, the focal length of the negative biconcave lens B-3 is f7, the focal length of the positive meniscus lens B-4 is f8, the focal length of the negative meniscus lens B-5 is f9, and the focal length of the positive biconvex lens B-6 is f10, wherein the focal lengths of the lenses meet the following relational expression: f1 is more than or equal to 35 and less than or equal to 39; f2 is more than or equal to-27 and less than or equal to-24; -13 is less than or equal to f3 is less than or equal to-10; f4 is more than or equal to 19 and less than or equal to 22; f5 is more than or equal to 15 and less than or equal to 20; f6 is more than or equal to 10 and less than or equal to 15; f7 is more than or equal to-11 and less than or equal to-6; f8 is more than or equal to 30 and less than or equal to 33; f9 is more than or equal to minus 36 and less than or equal to minus 32; f10 is more than or equal to 14 and less than or equal to 17.
8. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: the central thickness of the positive meniscus lens A-1 is 2.93mm, the central thickness of the negative meniscus lens A-2 is 1.2mm, the central thickness of the negative biconcave lens A-3 is 1.2mm, the central thickness of the positive biconvex lens A-4 is 1.89mm, the central thickness of the positive biconvex lens B-1 is 1.97mm, the central thickness of the positive biconvex lens B-2 is 2.63mm, the central thickness of the negative biconcave lens B-3 is 1.2mm, the central thickness of the positive meniscus lens B-4 is 1.77mm, the central thickness of the negative meniscus lens B-5 is 1.2mm, the central thickness of the positive biconvex lens B-6 is 3.30mm, and the central thickness of the protective spectacle lens is 1 mm.
9. A short focal length wide working distance machine vision lens as claimed in claim 1, characterized in that: the refractive index of the positive meniscus lens A-1, the positive biconvex lens B-1, the positive meniscus lens B-4 and the positive biconvex lens B-6 is n1, the Abbe number is v1, and the relation is that n1 is more than or equal to 1.7 and is less than or equal to 1.8, and v1 is more than or equal to 52 and is less than or equal to 53; the refractive index of the meniscus negative lens A-2 is n2, the Abbe number is v2, and the relation is satisfied: n2 is more than or equal to 1.6 and less than or equal to 1.7, and v2 is more than or equal to 54 and less than or equal to 55; the refractive index of the double-concave negative lens A-3 is n3, the Abbe number is v3, and the relation is satisfied: n3 is more than or equal to 1.7 and less than or equal to 1.8, and v3 is more than or equal to 52 and less than or equal to 53; the refractive index of the biconvex positive lens A-4 is n4, the Abbe number is v4, and the relation is satisfied: n4 is more than or equal to 1.7 and less than or equal to 1.8, and v4 is more than or equal to 29 and less than or equal to 30; the refractive index of the biconvex positive lens B-2 is n5, the Abbe number is v5, and the relation is satisfied: n5 is more than or equal to 1.5 and less than or equal to 1.6, and v5 is more than or equal to 67 and less than or equal to 68; the refractive index of the double-concave negative lens B-3 is n6, the Abbe number is v6, and the relation is satisfied: n6 is more than or equal to 1.7 and less than or equal to 1.8, and v6 is more than or equal to 27 and less than or equal to 28; the refractive index of the meniscus negative lens B-5 is n7, the Abbe number is v7, and the relation is satisfied: n7 is more than or equal to 1.6 and less than or equal to 1.7, and v7 is more than or equal to 36 and less than or equal to 37; the refractive index of the parallel plate C-1 is n8, the Abbe number is v8, and the relation is satisfied: n8 is more than or equal to 1.5 and less than or equal to 1.6, and v8 is more than or equal to 64 and less than or equal to 65.
10. A short focal length wide working distance machine vision lens as claimed in claim 3, characterized in that: the working distance of the lens is 100mm to infinity, the diaphragm and the front lens group A are kept still in the focusing process, and the distance range of the rear lens group B moving relative to the front lens group A is 0 to 1.45 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115390224A (en) * | 2022-09-28 | 2022-11-25 | 福建福光股份有限公司 | Zero-temperature-drift multi-scene image detection optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115390224A (en) * | 2022-09-28 | 2022-11-25 | 福建福光股份有限公司 | Zero-temperature-drift multi-scene image detection optical system |
| CN115390224B (en) * | 2022-09-28 | 2024-03-15 | 福建福光股份有限公司 | Zero-temperature-drift multi-scene image detection optical system |
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