CN215494316U - Low-distortion optical system and lens - Google Patents
Low-distortion optical system and lens Download PDFInfo
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- CN215494316U CN215494316U CN202120839063.1U CN202120839063U CN215494316U CN 215494316 U CN215494316 U CN 215494316U CN 202120839063 U CN202120839063 U CN 202120839063U CN 215494316 U CN215494316 U CN 215494316U
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Abstract
The invention discloses a low distortion optical system and a lens, wherein the optical system comprises the following components which are arranged from an object side to a phase side in sequence: a first lens having a positive optical power; a second lens having a negative focal power and disposed at an interval from the first lens; a third lens having a negative focal power and disposed at a distance from the second lens; a diaphragm which is arranged at a distance from the third lens and is used for limiting the aperture of the light beam; a fourth lens having positive focal power and disposed at a distance from the diaphragm; a fifth lens having a negative power and constituting a cemented lens with the fourth lens; a sixth lens having positive refractive power and disposed at a distance from the fifth lens; a seventh lens having positive optical power and disposed at a distance from the sixth lens; and the photosensitive chip is arranged at a distance from the seventh lens and is used for capturing an imaging signal and forming an image. By arranging lens combinations with different structures and reasonably distributing focal power of each lens, high resolution is obtained, and simultaneously low distortion and high relative illumination of the optical system are realized.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a low-distortion optical system and a lens.
Background
The fixed-focus lens has the characteristics of relatively low cost and high resolution, so that the fixed-focus lens is widely applied to the monitoring field. The specifications and performance requirements of the fixed-focus monitoring lens in the current market are higher and higher, for example, the requirement on high-definition resolution capability is met and is as high as 4K and above; low distortion; high relative illumination; in order to realize high definition, small picture distortion and high relative illumination, most of the existing products in the market adopt a lens structure containing a plastic aspheric lens, but the plastic aspheric lens has the problems of easy aging and poor stability.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a low-distortion optical system and a lens, which can solve the problems of high distortion and low relative illumination of the conventional lens.
A low distortion optical system according to an embodiment of a first aspect of the present invention includes, arranged in order from an object side to a phase side: a first lens having a positive optical power; a second lens having a negative focal power and disposed at an interval from the first lens; a third lens having a negative focal power and disposed at a distance from the second lens; a diaphragm which is arranged at a distance from the third lens and is used for limiting the aperture of the light beam; a fourth lens having positive focal power and disposed at a distance from the diaphragm; a fifth lens having a negative power and constituting a cemented lens with the fourth lens; a sixth lens having positive refractive power and disposed at a distance from the fifth lens; a seventh lens having positive optical power and disposed at a distance from the sixth lens; and the photosensitive chip is arranged at a distance from the seventh lens and is used for capturing an imaging signal and forming an image.
The low distortion optical system according to the embodiment of the first aspect of the present invention has at least the following advantages: by arranging lens combinations with different structures and reasonably distributing focal power of each lens, high resolution is obtained, and simultaneously low distortion and high relative illumination of the optical system are realized.
According to some embodiments of the first aspect of the present disclosure, the first lens element is meniscus-shaped, and a surface facing the object side is convex and a surface facing the image side is concave; one surface of the second lens, facing the object side, is a convex surface, and one surface of the second lens, facing the image side, is a concave surface; one surface of the third lens, facing the object side, is a convex surface, and one surface of the third lens, facing the image side, is a concave surface; both surfaces of the fourth lens are convex surfaces; both surfaces of the fifth lens are concave surfaces; one surface of the sixth lens element, which faces the object side, is a concave surface, and one surface of the sixth lens element, which faces the image side, is a convex surface; both faces of the seventh lens are convex.
According to some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation 2<f1/f<4；
-3<f2/f<-1；
-3<f3/f<-1；
2<f4-5/f<6；
1<f6/f<3；
1<f7/f<3；
2.5<TL/f<4；
Where f is the focal length of the low distortion optical system, f1Is the focal length of the first lens, f2Is the focal length of the second lens, f3Is the focal length of the third lens, f4-5Is the combined focal length of the fourth lens and the fifth lens, f6Is the focal length of the sixth lens, f7TL is the overall length of the low distortion optical system, which is the focal length of the seventh lens.
According to some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation
Nd1≥1.7；
Nd2≤1.5；
Nd3≤1.5；
Nd4≥1.8；
Nd5≥1.8；
Nd6≤1.7；
Nd7≥1.7；
Wherein, Nd1Is the refractive index of the first lens, Nd2Refractive index of the second lens, Nd3Refractive index of the third lens, Nd4Refractive index of the fourth lens, Nd5Refractive index of fifth lens, Nd6Refractive index of sixth lens, Nd7Is the refractive index of the seventh lens.
According to some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation
Vd1≤55；
Vd2≥60；
Vd3≥60；
Vd4≤40；
Vd5≤40；
Vd6≥50；
Vd7≥50；
Wherein, Vd1Is the Abbe number of the first lens, Vd2Is the Abbe number of the second lens, Vd3Is the Abbe number of the third lens, Vd4Is the Abbe number of the fourth lens, Vd5Is the Abbe number, Vd, of the fifth lens6Is the Abbe number, Vd, of the sixth lens7The abbe number of the seventh lens.
According to some embodiments of the first aspect of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are made of glass.
According to some embodiments of the first aspect of the present invention, an optical filter is disposed between the seventh lens and the photosensitive chip in sequence.
According to some embodiments of the first aspect of the present invention, a protective glass is disposed between the optical filter (11) and the photosensitive chip in sequence.
A low distortion optical lens according to an embodiment of a second aspect of the present invention includes a lens barrel, and the low distortion optical system disposed inside the lens barrel.
The low distortion optical system according to the embodiment of the second aspect of the present invention has at least the following advantages: by arranging the lens combinations with different structures and reasonably distributing the focal power of each lens, the low distortion and the high relative illumination of the video lens are realized while the high resolution is obtained.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a low distortion optical system according to an embodiment of a first aspect of the present invention;
FIG. 2 is a graph of MTF for a low distortion optical system according to an embodiment of the first aspect of the present invention;
FIG. 3 is a graph of MTF curves at specified frequencies for each field of view of a low distortion optical system in accordance with an embodiment of the first aspect of the present invention;
FIG. 4 is a distortion plot of a low distortion optical system according to an embodiment of the first aspect of the present invention;
fig. 5 is a graph of relative illuminance of a low distortion optical system according to an embodiment of the first aspect of the present invention.
Reference numerals:
the lens comprises a first lens 1, a second lens 2, a third lens 3, a diaphragm STO, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a photosensitive chip 8, an optical filter 9 and protective glass 10.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, a low distortion optical system according to an embodiment of the first aspect of the present invention includes, sequentially from an object side to a phase side: a first lens 1 having a positive refractive power; a second lens 2 having a negative refractive power and spaced apart from the first lens 1; a third lens 3 having a negative refractive power and disposed at a distance from the second lens 2; a stop STO provided at a distance from the third lens 3 and limiting the beam aperture; a fourth lens 4 having a positive refractive power and disposed at a distance from the stop STO; a fifth lens 5 having a negative power and constituting a cemented lens with the fourth lens 4; a sixth lens 6 having a positive refractive power and disposed at a distance from the fifth lens 5; a seventh lens 7 having positive refractive power and disposed at a distance from the sixth lens 6; and a photosensitive chip 8 disposed apart from the seventh lens 7 for capturing an imaging signal and forming an image.
In the embodiment, by setting the lens combinations with different structures and reasonably distributing the focal power of each lens, high resolution is obtained, and simultaneously, low distortion and high relative illumination of the optical system are realized.
In some embodiments of the first aspect of the present disclosure, the first lens element 1 is meniscus-shaped, and has a convex surface facing the object side and a concave surface facing the image side; one surface of the second lens element 2 facing the object side is a convex surface, and one surface facing the image side is a concave surface; one surface of the third lens element 3 facing the object side is a convex surface, and the other surface facing the image side is a concave surface; both surfaces of the fourth lens 4 are convex surfaces; both surfaces of the fifth lens 5 are concave surfaces; one surface of the sixth lens element 6 facing the object side is a concave surface, and one surface facing the image side is a convex surface; two surfaces of the seventh lens 7 are convex surfaces, the system structure is simple, the lens processing performance is good, the mass production of the lens is facilitated, and the production cost of the lens is reduced.
In some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation
2<f1/f<4；
-3<f2/f<-1；
-3<f3/f<-1；
2<f4-5/f<6；
1<f6/f<3；
1<f7/f<3；
2.5<TL/f<4；
Wherein f is the focal length of the optical system, f1Is the focal length of the first lens 1, f2Is the focal length of the second lens 2, f3Is the focal length of the third lens 3, f4-5Is the combined focal length of the fourth lens 4 and the fifth lens 5, f6Is the focal length of the sixth lens 6, f7TL is the total length of the lens optics, which is the focal length of the seventh lens 7.
The focal power of each lens in the lens optical system of the embodiment has a reasonable distribution proportion, the second lens 2 and the third lens 3 of the front group have negative focal power, the deflection of light angle can be realized as soon as possible, and the included angle between the light beam and the optical axis is reduced, so that the light beam incident angle of the rear lens is reduced, the correction of off-axis aberration is facilitated, the resolution capability of the lens is improved, the front group optical path is complicated by two continuous negative lenses, and the distortion of the lens is reduced; the two surfaces of the third lens 3 are bent to the diaphragm, and the front surface of the fourth lens 4 is close to the diaphragm, so that spherical aberration and coma aberration can be corrected, and the resolution of the lens in an on-axis view field can be improved; the seventh lens 7 has positive focal power, and the surface close to the image plane is a convex surface, so that the incident angle of the chief ray on the image plane can be reduced, and the improvement of relative illumination is facilitated.
In some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation
Nd1≤1.8；Nd2≤1.6；Nd3≤1.8；
Nd4≥1.7；Nd5≥1.7；
|Nd6-Nd7|≥0.2；
Nd8≤1.8；
Wherein, Nd1Is the refractive index of the first lens 1, Nd2Is the refractive index of the second lens 2, Nd3Refractive index of the third lens 3, Nd4Refractive index of the fourth lens 4, Nd5Refractive index of the fifth lens 6, Nd6Refractive index of the sixth lens 7, Nd7Refractive index of the seventh lens 8, Nd8Is the refractive index of the eighth lens 9.
In this embodiment, the lens combination structure satisfying the above refractive index relationship is beneficial to realizing reasonable distribution of focal power, and can better balance spherical aberration, coma aberration and curvature of field, thereby improving the resolving power of the optical system and obtaining a high-definition image. The second lens 2 and the third lens 3 both use low-refractive-index materials, share negative focal power together, and correct spherical aberration and curvature of field of the system; the front surface of the fourth lens 4 and the rear surface of the fifth lens 5 are both bent to the image surface, and both the fourth lens and the fifth lens are made of high-refractive-index materials, so that astigmatism can be corrected favorably, and performance difference of the lens in the meridian and sagittal directions can be improved.
In some embodiments of the first aspect of the present invention, the low distortion optical system satisfies the following relation
Vd1≥30；Vd2≥50；Vd3≥30；
Vd4≤50；Vd5≤50；
|Vd6-Vd7|≥30；
Vd8≥50；
Wherein, Vd1Is the Abbe number, Vd, of the first lens 12Is the Abbe number, Vd, of the second lens 23Is the Abbe number, Vd, of the third lens 34Is the Abbe number, Vd, of the fourth lens 45Is the color of the fifth lens 6Coefficient of dispersion, Vd6Is the Abbe number, Vd, of the sixth lens 77Is the Abbe number, Vd, of the seventh lens 88The abbe number of the eighth lens 9.
The lenses are made of materials with reasonable dispersion coefficients, and particularly the second lens 2, the third lens 3 and the sixth lens 6 are made of low-dispersion materials, so that the chromatic aberration of the system is reduced, and the resolving power of the lens is further improved; the fourth lens 4 and the fifth lens 5 form a bonded lens, and compared with a single lens, the tolerance sensitivity of the system is lower, so that the yield of the lens is improved, and the production cost is reduced.
In some embodiments of the first aspect of the present invention, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all made of glass material, and compared with plastic material, the transmittance in the visible light band is higher, the light energy finally reaching the photosensitive chip is less lost, the imaging permeability is better, and the physical and chemical stability of the glass material is far better than that of the plastic lens, so that when the conditions such as temperature change, the change of the optical parameters of the glass material is much smaller than that of the plastic material, and the glass material can be better applied to various severe environments; meanwhile, the glass material is not easy to age and deform, and the service life is longer.
In some embodiments of the first aspect of the present invention, an optical filter 9 is disposed between the seventh lens 7 and the light sensing chip 8. The optical filter 9 can filter a part of stray light to prevent the photosensitive chip from being interfered by infrared rays, so that the image quality of the image is clear, and the color is bright.
Further, in some embodiments of the first aspect of the present invention, a protective glass 10 is disposed between the optical filter 9 and the photosensitive chip 8, and the protective glass 10 can protect the photosensitive chip 10 from collision damage.
In some embodiments of the invention, peripheral field light passes through the lens to reach the surface of the chip as much as possible by arranging vignetting as little as possible or not, so that the lens obtains higher relative illumination, and the uniformity and the permeability of the overall image surface brightness are ensured.
In some embodiments of the present invention, the focal length f of the low distortion optical system is 7.2mm, FNO is 2.2, FOV is 48.3 °, and the total length TL of the optical system is 23mm, which can be used with a 1/2.8 "photo-sensing chip.
The specific parameters of the lens of this embodiment are shown in the following table:
in the above table, the units of radius R, thickness and half-diameter are all millimeters;
FIGS. 2-5 are graphs of optical performance of embodiments of the present invention, wherein FIG. 2 is a graph of MTF curves of an optical system for evaluating the resolving power of the optical system, and it can be seen from the graphs that the MTF curves of all fields are greater than 0.3 at 200lp/mm, the field has excellent resolving power, and the trends of the on-axis MTF curves and the off-axis MTF curves are substantially consistent; fig. 3 is an MTF curve of each field of view of the optical system at a certain specified spatial frequency, which is used to analyze the uniformity of the imaging of each field of view after the light passes through the system, and it can be seen from the graph that the MTF value of each field of view changes very little at the specified frequency, which ensures the consistency of the imaging performance of the peripheral field of view and the central field of view; FIG. 4 is a distortion curve of the optical system, the optical distortion is only-1% in the full view field, the distortion is very small, and the reality of the imaging picture can be ensured; fig. 5 is a relative illumination curve of the optical system, where the full-field relative illumination is 86%, and the high relative illumination can ensure the uniformity of the overall image brightness distribution, and the brightness difference between the brightness and the center is very small even at the corners of the image.
According to the low-distortion optical lens in the embodiment of the second aspect of the invention, the lens barrel and the low-distortion optical system arranged in the lens barrel are provided, and by arranging lens combinations with different structures and reasonably distributing the focal power of each lens, high resolution is obtained, and simultaneously, low distortion and high relative illumination of the video lens are realized.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A low distortion optical system characterized by: comprising, arranged in sequence from the object side to the phase side
A first lens (1) having a positive optical power;
a second lens (2) having a negative focal power and disposed at a distance from the first lens (1);
a third lens (3) having a negative focal power and disposed at a distance from the second lens (2);
a Stop (STO) which is disposed at a distance from the third lens (3) and limits the aperture of the light beam;
a fourth lens (4) having a positive optical power and disposed at a distance from the Stop (STO);
a fifth lens (5) having a negative power and constituting a cemented lens with the fourth lens (4);
a sixth lens (6) having a positive refractive power and disposed at a distance from the fifth lens (5);
a seventh lens (7) having a positive refractive power and disposed at a distance from the sixth lens (6);
and the photosensitive chip (8) is arranged at a distance from the seventh lens (7) and is used for capturing an imaging signal and forming an image.
2. A low distortion optical system as set forth in claim 1, wherein: the first lens (1) is meniscus-shaped, one surface facing the object side is a convex surface, and one surface facing the image side is a concave surface; one surface of the second lens (2) facing the object side is a convex surface, and one surface facing the image side is a concave surface; one surface of the third lens (3) facing the object side is a convex surface, and one surface facing the image side is a concave surface; both surfaces of the fourth lens (4) are convex surfaces; both surfaces of the fifth lens (5) are concave surfaces; one surface of the sixth lens (6) facing the object side is a concave surface, and one surface facing the image side is a convex surface; both surfaces of the seventh lens (7) are convex surfaces.
3. A low distortion optical system according to claim 1 or 2, characterized in that: the low distortion optical system satisfies the following relational expression
2<f1/f<4；
-3<f2/f<-1；
-3<f3/f<-1；
2<f4-5/f<6；
1<f6/f<3；
1<f7/f<3；
2.5<TL/f<4；
Where f is the focal length of the low distortion optical system, f1Is the focal length of the first lens (1), f2Is the focal length of the second lens (2), f3Is the focal length of the third lens (3), f4-5Is the combined focal length of the fourth lens (4) and the fifth lens (5), f6Is the focal length of the sixth lens (6), f7TL is the total length of the low distortion optical system at the focal length of the seventh lens (7).
4. A low distortion optical system according to claim 1 or 2, characterized in that: the low distortion optical system satisfies the following relational expression
Nd1≥1.7；
Nd2≤1.5；
Nd3≤1.5；
Nd4≥1.8；
Nd5≥1.8；
Nd6≤1.7；
Nd7≥1.7；
Wherein, Nd1Is the refractive index of the first lens (1), Nd2Is the refractive index of the second lens (2), Nd3Is the refractive index of the third lens (3), Nd4Is the refractive index of the fourth lens (4), Nd5Is a refractive index of the fifth lens (5), Nd6Is a refractive index of the sixth lens (6), Nd7Is the refractive index of the seventh lens (7).
5. A low distortion optical system according to claim 1 or 2, characterized in that: the low distortion optical system satisfies the following relational expression
Vd1≤55；
Vd2≥60；
Vd3≥60；
Vd4≤40；
Vd5≤40；
Vd6≥50；
Vd7≥50；
Wherein, Vd1Is the Abbe number, Vd, of the first lens (1)2Is the Abbe number, Vd, of the second lens (2)3Is the Abbe number, Vd, of the third lens (3)4Is the Abbe number, Vd, of the fourth lens (4)5Is the Abbe number, Vd, of the fifth lens (5)6Is the Abbe number, Vd, of the sixth lens (6)7Is the abbe number of the seventh lens (7).
6. A low distortion optical system according to claim 1 or 2, characterized in that: the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all made of glass.
7. A low distortion optical system as set forth in claim 1, wherein: and an optical filter (9) is sequentially arranged between the seventh lens (7) and the photosensitive chip (8).
8. A low distortion optical system as set forth in claim 7, wherein: and protective glass (10) is sequentially arranged between the optical filter (9) and the photosensitive chip (8).
9. A low distortion optical lens, characterized in that: comprising a lens barrel, and the low distortion optical system according to any one of claims 1 to 8 disposed inside the lens barrel.
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| CN202120839063.1U CN215494316U (en) | 2021-04-22 | 2021-04-22 | Low-distortion optical system and lens |
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| CN202120839063.1U CN215494316U (en) | 2021-04-22 | 2021-04-22 | Low-distortion optical system and lens |
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