CN113467053A - Large-target-surface FA lens - Google Patents
Large-target-surface FA lens Download PDFInfo
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- CN113467053A CN113467053A CN202110795319.8A CN202110795319A CN113467053A CN 113467053 A CN113467053 A CN 113467053A CN 202110795319 A CN202110795319 A CN 202110795319A CN 113467053 A CN113467053 A CN 113467053A
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented 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
Abstract
The invention discloses a large target surface FA lens, which belongs to the technical field of optical design and is characterized by comprising seven spherical lenses along a light path in sequence; the first lens receives incident light, is a concave-convex lens and has positive focal power; the first cemented combination formed by the second lens and the third lens has negative focal power, wherein: the second lens is a plano-convex lens, and the third lens is a plano-concave lens; an aperture diaphragm; the second cemented combination formed by the fourth lens and the fifth lens is provided with negative focal power, wherein: the fourth lens is a concave lens, and the fifth lens is a convex lens; a sixth lens that is a plano-convex lens having a positive optical power; and the seventh lens is a concave-convex lens and has positive focal power. The invention can increase the target surface of the FA lens, ensure the resolution of the FA lens, reduce the aberration such as the distortion of the FA lens as much as possible and reduce the volume of the FA lens as much as possible.
Description
Technical Field
The invention belongs to the technical field of optical design, and particularly relates to a large-target-surface FA lens.
Background
With the rapid development of industrial automation, the industrial lens is widely applied to the industries of quality detection, production, manufacturing and the like, so that errors caused by manual operation are reduced or eliminated, and the measurement precision and speed are improved. And the improvement and the wide application of the detection level put forward higher requirements on the volume, the distortion and the like of a machine vision lens. In addition, along with the improvement of chip technology, the chip size is bigger and bigger, the pixel size is smaller and smaller, and the advantages of the chip can be fully exerted only if the lens target surface is bigger and the resolution is higher and higher. The target surface and supported resolution of the traditional machine vision lens can not meet the latest market requirement.
With the improvement of camera chip technology, there are more and more large target cameras, while the current industrial lens mainly has a small target, and the current FA lens designs are most common with 1/1.8 target, 2/3 target and 1 inch target. And the development of industrial automation puts new requirements on the resolution, the volume and the distortion of the lens. With the improvement of chip technology, large-size chips are increasingly popularized, and the size of a lens target surface is increased. And as the angle of view of the lens increases, the primary aberration and the high-order aberration are more difficult to control in the lens design process.
Disclosure of Invention
The invention provides the FA lens with the large target surface, which aims to solve the technical problems in the prior art, ensure the resolution of the FA lens while increasing the target surface of the FA lens, reduce the aberration such as the distortion of the FA lens as much as possible and reduce the volume of the FA lens as much as possible.
The invention aims to provide a large target surface FA lens which sequentially comprises seven lenses along a light path; the method specifically comprises the following steps:
the first lens receives incident light, is a concave-convex lens and has positive focal power;
the first cemented combination formed by the second lens and the third lens has negative focal power, wherein: the second lens is a plano-convex lens, and the third lens is a plano-concave lens;
an aperture diaphragm;
the second cemented combination formed by the fourth lens and the fifth lens is provided with negative focal power, wherein: the fourth lens is a concave lens, and the fifth lens is a convex lens;
a sixth lens that is a plano-convex lens having a positive optical power;
and the seventh lens is a concave-convex lens and has positive focal power.
Preferably, the middle points of the second lens and the third lens are coated with photosensitive glue.
Preferably, the middle points of the fourth lens and the fifth lens are coated with photosensitive glue.
Preferably, the radius of curvature of the light incident surface of the first lens is 25.626 ± 5%, and the radius of curvature of the light emergent surface of the first lens is 62.141 ± 5%; the curvature radius of the light incident surface of the second lens is 16.045 +/-5%, and the curvature radius of the light emergent surface is infinite; the light incident surface of the third lens is a plane, and the curvature radius of the light emergent surface is 10.570 +/-5%; the curvature radius of the light incident surface of the fourth lens is-10.989 +/-5%, and the curvature radius of the light emergent surface is 63.272 +/-5%; the curvature radius of the light incident surface of the fifth lens is 63.272 +/-5%, and the curvature radius of the light emergent surface is-16.064 +/-5%; the light incident surface of the sixth lens is a plane, and the curvature radius of the light emergent surface is-39.246 +/-5%; the curvature radius of the light incident surface of the seventh lens is 49.427 +/-5%, the curvature radius of the light emergent surface of the seventh lens is 119.693 +/-5%, and the unit is millimeter.
Preferably, the center thickness of the first lens is 4 +/-5%; the central thickness of the second lens is 7 +/-5%; the central thickness of the third lens is 3 +/-5%; the center thickness of the fourth lens is 3 +/-5%; the center thickness of the fifth lens is 6 +/-5%; the center thickness of the sixth lens is 5 +/-5%; the center thickness of the seventh lens is 3 +/-5%, and the units are millimeters.
Preferably, the distance between the air spaces of the first lens and the second lens on the optical axis is 2 +/-5%; the distance between the third lens and the air space of the diaphragm on the optical axis is 6 +/-5%; the distance between the diaphragm and the air space of the fourth lens on the optical axis is 8 +/-5%; the distance between the air intervals of the fifth lens and the sixth lens on the optical axis is 2 +/-5%; the distance between the air spaces of the sixth lens and the seventh lens on the optical axis is 1.5 +/-5%, and the unit is millimeter.
Preferably, the refractive index and the abbe number of the first lens are 1.66 and 36.5 +/-5 percent respectively; the refractive index and Abbe number of the second lens are 1.71, 53.83 +/-5%; the refractive index and Abbe number of the third lens are 1.65, 33.8 +/-5%; the refractive index and Abbe number of the fourth lens are 1.67 and 33.8 +/-5 percent; the refractive index and Abbe number of the fifth lens are 1.75, 57.8 +/-5%; the refractive index and Abbe number of the sixth lens are 1.75 and 57 +/-5 percent; the refractive index and Abbe number of the seventh lens are 1.71 and 54 +/-5 percent.
The invention has the advantages and positive effects that:
the technical scheme of the invention comprises seven spherical lenses, and the sixth lens and the seventh lens play a role in amplification, so that the diameters of all the lenses are smaller, the structure is compact, the production cost is reduced, the volume of the lens is smaller, and the lens better meets the market requirements; and after the optical system is amplified by the sixth lens and the seventh lens, the imaging surface is slightly larger than 4/3 CCD size of the target surface area-array camera, so that most of area-array cameras on the market are satisfied. The invention adopts two double-glue lens groups: the first gluing group and the second gluing group can mutually offset distortion and chromatic aberration caused by the property of the lens; the optical system has high resolution and can be used for a 3.3 mu m pixel camera.
Drawings
FIG. 1 is a light path diagram of a preferred embodiment of the present invention;
FIG. 2 is an optical speckle pattern of a preferred embodiment of the present invention;
FIG. 3 is a graph of the modulation function MTF of the preferred embodiment of the present invention;
FIG. 4 is a graph of field curvature and astigmatism for a preferred embodiment of the present invention;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Please refer to fig. 1.
A large target surface FA lens increases the target surface of the FA lens and simultaneously ensures various aberrations such as resolution, distortion and the like of the lens; the focal length is 35 mm. The three-dimensional spherical lens mainly comprises seven spherical lenses, enters from left to right along light rays and sequentially passes through the lenses as follows: the first lens G1 is a concave-convex lens with positive focal power, so that the rear small lens can smoothly receive light entering the optical system; the second lens G2 and the third lens G3 are a plano-convex lens and a plano-concave lens doubly cemented as a first cemented group U1, and have negative optical power; an aperture diaphragm 1 is arranged in the middle; the fourth lens G4 and the fifth lens G5 are formed by double-gluing a concave lens and a convex lens to form a second gluing group U2, have negative focal power, and can well balance chromatic aberration and distortion generated by a system; the main function of the rear two lenses is magnification, and the sixth lens G6 is a plano-convex lens with positive focal power; the seventh lens G7 is a concave-convex lens with positive focal power;
the first gluing group is formed by bonding the second plano-convex lens and the third plano-concave lens through optical glue, and the optical glue does not influence imaging.
The second glue group also bonds the fourth and fifth lenses by the same optical glue. The whole optical system is approximately in a symmetrical structure at the left end and the right end of the diaphragm, and optical distortion caused by the lens is reduced to the greatest extent.
The lenses of the first gluing group and the second gluing group are both composed of two lens groups, and the focuses of the two lenses are on the same straight line.
The convex lens and the concave lens in the first gluing set and the second gluing set are coaxial.
Photosensitive glue is coated on the middle points of the convex lenses and the middle points of the concave lenses in the first gluing group and the second gluing group.
Further explanation is made for each lens constituting the optical path: the curvature radius of the light incident surface of the first lens is 25.626 +/-5%, and the curvature radius of the light emergent surface is 62.141 +/-5%; the curvature radius of the light incident surface of the second lens is 16.045 +/-5%, and the light emergent surface is a plane, namely the curvature radius is infinite; the curvature radius of the light incident surface of the third lens is infinite, and the curvature radius of the light emergent surface is 10.570 +/-5%; the curvature radius of the light incident surface of the fourth lens is-10.989 +/-5%, and the curvature radius of the light emergent surface is 63.272 +/-5%; the curvature radius of the light incident surface of the fifth lens is 63.272 +/-5%, and the curvature radius of the light emergent surface of the fifth lens is-16.064 +/-5%; the curvature radius of the light incident surface of the sixth lens is 1 infinity, and the curvature radius of the light emergent surface is-39.246 +/-5%; the curvature radius of the light incident surface of the seventh lens is 49.427 +/-5%, and the curvature radius of the light emergent surface of the seventh lens is 119.693 +/-5%.
Center thickness of each lens constituting the optical path: the central thickness of the first lens is 4 +/-5%; the central thickness of the second lens is 7 +/-5%; the center thickness of the third lens is 3 +/-5%; the center thickness of the fourth lens is 3 +/-5%; the center thickness of the fifth lens is 6 +/-5%; the center thickness of the sixth lens is 5 +/-5%; the center thickness of the seventh lens is 3 + -5%. The units are millimeters.
The distance between the object and the air space of the first lens on the optical axis is 20-infinity; the distance between the air intervals of the first lens and the second lens on the optical axis is 2 +/-5%; the second lens and the third lens are doubly cemented without a gap; the distance between the third lens and the air space of the diaphragm on the optical axis is 6 +/-5%; the distance between the diaphragm and the air space of the fourth lens on the optical axis is 8 +/-5%; the fourth lens and the fifth lens are double-glued without a gap; the distance between the air intervals of the fifth lens and the sixth lens on the optical axis is 2 +/-5%; the distance between the air intervals of the sixth lens and the seventh lens on the optical axis is 1.5 +/-5%. The units are millimeters.
Refractive index and abbe number of each lens constituting an FA lens optical path: the refractive index and Abbe number of the first lens are respectively 1.66 and 36.5 +/-5%; the refractive index and Abbe number of the second lens are respectively 1.71, 53.83 +/-5%; the refractive index and Abbe number of the third lens are respectively 1.65 and 33.8 +/-5 percent; the refractive index and Abbe number of the fourth lens are respectively 1.67 and 33.8 +/-5 percent; the refractive index and Abbe number of the fifth lens are respectively 1.75 and 57.8 +/-5 percent; the refractive index and Abbe number of the sixth lens are respectively 1.75 and 57 +/-5 percent; the refractive index and Abbe number of the seventh lens are 1.71 and 54 +/-5 percent respectively.
The focal length of the FA lens is 35mm, the diameter of an entrance pupil is 25mm, the working distance is 0.2 m-infinity, and the working waveband is 450nm-700 nm.
Referring to fig. 2, the optical speckle pattern shows: wherein, the OBJ is the object space view field, the IMA is the image space view field, and the unit is millimeter. RMS RADIUS represents the root mean square RADIUS of the diffuse spot, GEO RADIUS represents the Airy spot RADIUS, both in microns. As shown, the Airy spot radius is 1.608 μm and the root mean square radius is 0.0.742 μm for the central field of view; in the fringe field, the Airy spot radius is 3.491 μm, the root mean square radius is 1.413 μm, the energy concentration and aberration correction of the on-axis and off-axis points are very good, and the ideal resolution is achieved.
Referring to fig. 3, the MTF graph shows that: the horizontal coordinate is space resolution, the unit is line pair/millimeter, the vertical coordinate is contrast, the value range is 0-1, and MTF under different fields has two components of meridian and sagittal. As shown, the entire MTF curve is compact, and it can be seen that the lens has high contrast and resolution.
Referring to fig. 4, from the field curvature and astigmatism diagrams: the ordinate is the field of view and the abscissa is in microns.
The distortion diagram shows that: the ordinate is the field of view and the abscissa is the distortion value. As can be seen, the distortion value of the lens in the full field of view is less than 0.0086%, and the lens has an extremely low distortion value.
In summary, the following steps: the FA lens designed by the invention has a larger target surface, higher resolution, extremely low distortion rate and smaller volume.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A large target surface FA lens is characterized by comprising seven spherical lenses along a light path in sequence; the method specifically comprises the following steps:
the first lens receives incident light, is a concave-convex lens and has positive focal power;
the first cemented combination formed by the second lens and the third lens has negative focal power, wherein: the second lens is a plano-convex lens, and the third lens is a plano-concave lens;
an aperture diaphragm;
the second cemented combination formed by the fourth lens and the fifth lens is provided with negative focal power, wherein: the fourth lens is a concave lens, and the fifth lens is a convex lens;
a sixth lens that is a plano-convex lens having a positive optical power;
and the seventh lens is a concave-convex lens and has positive focal power.
2. The large-target-surface FA lens according to claim 1, wherein the middle points of the second and third lenses are coated with photosensitive glue.
3. The large-target-surface FA lens according to claim 1, wherein the centers of the fourth lens and the fifth lens are coated with photosensitive glue.
4. The large-target-surface FA lens according to claim 1, wherein the radius of curvature of the light incident surface of the first lens is 25.626 ± 5%, and the radius of curvature of the light emergent surface is 62.141 ± 5%; the curvature radius of the light incident surface of the second lens is 16.045 +/-5%, and the curvature radius of the light emergent surface is infinite; the light incident surface of the third lens is a plane, and the curvature radius of the light emergent surface is 10.570 +/-5%; the curvature radius of the light incident surface of the fourth lens is-10.989 +/-5%, and the curvature radius of the light emergent surface is 63.272 +/-5%; the curvature radius of the light incident surface of the fifth lens is 63.272 +/-5%, and the curvature radius of the light emergent surface is-16.064 +/-5%; the light incident surface of the sixth lens is a plane, and the curvature radius of the light emergent surface is-39.246 +/-5%; the curvature radius of the light incident surface of the seventh lens is 49.427 +/-5%, the curvature radius of the light emergent surface of the seventh lens is 119.693 +/-5%, and the unit is millimeter.
5. The large-target-surface FA lens according to claim 1, wherein the center thickness of the first lens is 4 + 5%; the central thickness of the second lens is 7 +/-5%; the central thickness of the third lens is 3 +/-5%; the center thickness of the fourth lens is 3 +/-5%; the center thickness of the fifth lens is 6 +/-5%; the center thickness of the sixth lens is 5 +/-5%; the center thickness of the seventh lens is 3 +/-5%, and the units are millimeters.
6. The large-target-surface FA lens according to claim 1, wherein the air space between the first and second lenses is 2 + 5% of the distance on the optical axis; the distance between the third lens and the air space of the diaphragm on the optical axis is 6 +/-5%; the distance between the diaphragm and the air space of the fourth lens on the optical axis is 8 +/-5%; the distance between the air intervals of the fifth lens and the sixth lens on the optical axis is 2 +/-5%; the distance between the air spaces of the sixth lens and the seventh lens on the optical axis is 1.5 +/-5%, and the unit is millimeter.
7. The large-target-surface FA lens according to claim 1, wherein the refractive index and Abbe number of the first lens are 1.66 and 36.5 +/-5%, respectively; the refractive index and Abbe number of the second lens are 1.71, 53.83 +/-5%; the refractive index and Abbe number of the third lens are 1.65, 33.8 +/-5%; the refractive index and Abbe number of the fourth lens are 1.67 and 33.8 +/-5 percent; the refractive index and Abbe number of the fifth lens are 1.75, 57.8 +/-5%; the refractive index and Abbe number of the sixth lens are 1.75 and 57 +/-5 percent; the refractive index and Abbe number of the seventh lens are 1.71 and 54 +/-5 percent.
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