CN215494320U - Fixed-focus optical system and lens - Google Patents
Fixed-focus optical system and lens Download PDFInfo
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- CN215494320U CN215494320U CN202121435532.XU CN202121435532U CN215494320U CN 215494320 U CN215494320 U CN 215494320U CN 202121435532 U CN202121435532 U CN 202121435532U CN 215494320 U CN215494320 U CN 215494320U
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Abstract
The utility model discloses a fixed focus optical system, which comprises the following components in sequence from an object side to a phase side: a first lens having a positive refractive power; a second lens having a negative focal power and disposed at an interval from the first lens; a third lens having positive focal power and disposed at an interval from the second lens; a fourth lens having positive focal power and disposed at an interval from the third lens; the diaphragm is arranged at an interval with the fourth lens and used for limiting the aperture of the light beam; the fifth lens has negative focal power and is arranged at a distance from the diaphragm; the sixth lens has positive focal power and forms a bonding lens with the fifth lens; a seventh lens having positive refractive power and disposed at an interval 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 utility model relates to the technical field of optical lenses, in particular to a fixed-focus optical system and a lens.
Background
The fixed focus lens has the characteristics of low cost and high resolution, and has a great share in the monitoring security and video field market. The specification and performance requirements of the fixed-focus monitoring lens in the current market are very high, for example, the requirement of meeting high-definition resolution capability is met, and the resolution capability reaches 4K or more; low distortion, even no 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, however, compared with a glass lens, the plastic aspheric lens has the disadvantages of easy aging and poor stability.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a fixed-focus optical system and a lens, which can solve the problems of low resolution, high distortion and low relative illumination of the conventional lens.
A fixed-focus optical system according to an embodiment of a first aspect of the present invention includes, 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 positive optical power and disposed at a distance from the second lens; a fourth lens having positive refractive power and disposed at a distance from the third lens; a stop STO spaced apart from the fourth lens and limiting a beam aperture; a fifth lens having a negative power and disposed at a distance from the stop STO; a sixth lens having positive optical power and constituting a cemented lens with 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 fixed-focus optical system provided by the embodiment of the first aspect of the utility model has at least the following beneficial effects: through the lens combination that sets up different structures to the focal power of each lens of rational distribution, when obtaining high definition resolution, realized optical system's low distortion and high relative illuminance, camera lens structural style is simple, and lens processing nature is good, possesses better volume production nature, and is with low costs.
According to some embodiments of the first aspect of the present disclosure, a surface of the first lens element facing the object side is convex, and a surface of the first lens element 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 concave surface, and one surface of the third lens, facing the image side, is a convex surface; one surface of the fourth lens, facing the object side, is a convex surface, and one surface of the fourth lens, facing the image side, is a concave surface; both surfaces of the fifth lens are concave surfaces; both surfaces of the sixth lens are convex surfaces; both surfaces of the seventh lens are convex surfaces.
According to some embodiments of the first aspect of the present invention, the fixed focus optical system satisfies the following relation
1.5<f1/f<4；
-1.5<f2/f<-0.5；
3<f3/f<5；
2<f4/f<4；
3.5<f5-6/f<6；
1<f7/f<2；
2.5<TL/f<4；
Wherein f is the focal length of the 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, f4Is the focal length of the fourth lens, f5-6Is the combined focal length of the fifth lens and the sixth lens, f7TL is the total length of the lens optics, which is the focal length of the seventh lens.
According to some embodiments of the first aspect of the present invention, the fixed focus optical system satisfies the following relation
Nd1≥1.6；
Nd2≤1.7；
Nd3≥1.6；
Nd4≥1.6；
Nd5≥1.6；
Nd6≤1.7；
Nd7≥1.6；
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 fixed focus optical system satisfies the following relation
Vd1≥30；
Vd2≤50；
Vd3≥30；
Vd4≤30；
Vd5≤30；
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 sequentially disposed between the optical filter and the photosensitive chip.
A fixed focus lens according to an embodiment of a second aspect of the present invention includes a lens barrel, and the fixed focus optical system provided in the lens barrel.
The fixed focus system according to the embodiment of the second aspect of the utility model 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 utility model 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 utility model.
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 view of a fixed focus optical system according to an embodiment of the first aspect of the present invention;
FIG. 2 is a graph of MTF of a fixed focus optical system according to an embodiment of the first aspect of the present invention;
FIG. 3 is a defocus graph of a fixed focus optical system according to an embodiment of the first aspect of the present invention;
FIG. 4 is a graph of MTF curves at specified frequencies for fields of view of a fixed focus optical system in accordance with an embodiment of the first aspect of the present invention;
FIG. 5 is a distortion plot of a fixed focus optical system in accordance with an embodiment of the first aspect of the present invention;
fig. 6 is a graph of relative illuminance of a fixed-focus 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 fixed focus 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 disposed at a distance from the first lens 1; a third lens 3 having a positive refractive power and disposed at a distance from the second lens 2; a fourth lens 4 having a positive refractive power and disposed at a distance from the third lens 3; a stop STO spaced apart from the fourth lens 4 and limiting a beam aperture; a fifth lens 5 having a negative power and disposed at a distance from the stop STO; a sixth lens 6 having a positive refractive power and constituting a cemented lens with 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 spaced 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, a surface of the first lens element 1 facing the object side is convex, and a surface facing the image side is concave; 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 concave surface, and the other surface facing the image side is a convex surface; one surface of the fourth lens element 4 facing the object side is a convex surface, and one surface facing the image side is a concave surface; both surfaces of the fifth lens 5 are concave surfaces; both surfaces of the sixth lens 6 are convex surfaces; 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, a fixed focus optical system satisfies the following relation
1.5<f1/f<4；
-1.5<f2/f<-0.5；
3<f3/f<5；
2<f4/f<4；
3.5<f5-6/f<6；
1<f7/f<2；
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, f4Is the focal length of the fourth lens 4, f5-6Is the combined focal length of the fifth lens 5 and 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 has a reasonable distribution proportion, the front group has negative focal power, the rear group has positive focal power, and the whole lens is in a symmetrical structure form, so that the coma aberration, distortion and vertical axis chromatic aberration of a system can be corrected, the resolution capability of the lens can be improved, the sensitivity of parts can be reduced, the yield can be improved, and the production cost can be reduced; the diaphragm is positioned between the fourth lens 4 and the fifth lens 5, the distance between the two lenses and the diaphragm is small, and the surfaces of the two lenses close to the diaphragm are both bent to the diaphragm surface, so that the angle of light incident to the surface of the lens is favorably reduced, the spherical aberration and the coma aberration of the system are favorably corrected, and the high-definition resolving power is realized; 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, a fixed focus optical system satisfies the following relation
Nd1≥1.6；
Nd2≤1.7；
Nd3≥1.6；
Nd4≥1.6；
Nd5≥1.6；
Nd6≤1.7；
Nd7≥1.6；
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 5, Nd6Refractive index of the sixth lens 6, Nd7Is the refractive index of the seventh lens 7.
In this embodiment, the lens combination structure satisfying the 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 front group of the plurality of positive lenses are made of glass materials with relatively high refractive indexes, the front group of the negative lenses are made of materials with relatively low refractive indexes, the surface curvature degree of the negative lenses is increased, the surface curvature degree of the positive lenses is reduced, the negative lenses generate large spherical aberration and field curvature, the negative lenses and the positive lenses compensate each other, residual aberration after the front group is corrected in a rear group structure in a symmetrical mode, and the resolution capability of the system is improved.
In some embodiments of the first aspect of the present invention, a fixed focus optical system satisfies the following relation
Vd1≥30；
Vd2≤50；
Vd3≥30；
Vd4≤30；
Vd5≤30；
Vd6≥50；
Vd7≤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 Abbe number, Vd, of the fifth lens 56Is the Abbe number, Vd, of the sixth lens 67The abbe number of the seventh lens 7.
The lenses are made of materials with reasonable dispersion coefficients, particularly the fifth lens 5 and the sixth lens 6 form a bonded lens, and high-low dispersion materials are matched with each other, so that chromatic aberration of the system can be corrected, and the resolving power of the lens can be further improved.
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 8 from collision damage.
In some embodiments of the utility model, peripheral field light passes through the lens to reach the surface of the photosensitive chip 8 as much as possible by setting vignetting as little as possible or not setting vignetting, 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, a fixed-focus optical system has a design wavelength band of 435-656 nm, a system focal length f of 7.2mm, FNO of 2.2, FOV of 48.2 °, and a total optical system length TL of 23mm, and can be used with a 1/2.8 ″ photosensitive 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. 2-6 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 a defocusing curve of the optical system, from which it can be seen that the optimal imaging planes of the light rays of each field of view coincide, the position of the imaging plane of the central field of view has no obvious deviation, and the light rays of each field of view can be uniformly imaged on the same surface; fig. 4 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 imaging of each field of view after 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, thereby ensuring the consistency of imaging performance of the peripheral field of view and the central field of view; FIG. 5 is a distortion curve of an optical system, in which the optical distortion is only-1% in a full view field, and the distortion is small, so that the authenticity of an imaging picture can be ensured; fig. 6 is a relative illumination curve of the optical system, where the full-field relative illumination is 70%, 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 fixed-focus lens provided by the embodiment of the second aspect of the utility model, the lens barrel and the fixed-focus optical system arranged in the lens barrel are provided, and the optical power of each lens is reasonably distributed by arranging lens combinations with different structures, so that high resolution is obtained, and meanwhile, low distortion and high relative illumination of the fixed-focus 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 utility model. 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 utility model 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 utility model, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A fixed focus 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 positive refractive power and disposed at a distance from the second lens (2);
a fourth lens (4) having a positive refractive power and disposed at a distance from the third lens (3);
a Stop (STO) which is disposed at a distance from the fourth lens (4) and limits the aperture of the light beam;
a fifth lens (5) having a negative power and disposed at a distance from the Stop (STO);
a sixth lens (6) having a positive refractive power and constituting a cemented lens with 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 fixed focus optical system according to claim 1, characterized in that:
one surface of the first lens (1) facing to the object side is a convex surface, and one surface facing to 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 concave surface, and one surface facing the image side is a convex surface;
one surface of the fourth lens (4) facing the object side is a convex surface, and one surface facing the image side is a concave surface;
both surfaces of the fifth lens (5) are concave surfaces;
both surfaces of the sixth lens (6) are convex surfaces;
both surfaces of the seventh lens (7) are convex surfaces.
3. A fixed focus optical system according to claim 1 or 2, characterized in that: the fixed-focus optical system satisfies the following relational expression
1.5<f1/f<4；
-1.5<f2/f<-0.5；
3<f3/f<5；
2<f4/f<4；
3.5<f5-6/f<6；
1<f7/f<2；
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), f4Is the focal length of the fourth lens (4), f5-6Is the combined focal length of the fifth lens (5) and the sixth lens (6), f7Is the focal length of the seventh lens (7), and TL is the overall length of the lens optics.
4. A fixed focus optical system according to claim 1 or 2, characterized in that: the fixed-focus optical system satisfies the following relational expression
Nd1≥1.6；
Nd2≤1.7；
Nd3≥1.6；
Nd4≥1.6；
Nd5≥1.6；
Nd6≤1.7；
Nd7≥1.6；
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 fixed focus optical system according to claim 1 or 2, characterized in that: the fixed-focus optical system satisfies the following relational expression
Vd1≥30；
Vd2≤50；
Vd3≥30；
Vd4≤30；
Vd5≤30；
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 fixed focus 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 fixed focus optical system according to claim 1, characterized in that: and an optical filter (9) is sequentially arranged between the seventh lens (7) and the photosensitive chip (8).
8. The prime optical system according to claim 7, wherein: and protective glass (10) is sequentially arranged between the optical filter (9) and the photosensitive chip (8).
9. A fixed focus lens is characterized in that: comprising a lens barrel, and a fixed focus optical system according to any one of claims 1 to 8 disposed in the lens barrel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121435532.XU CN215494320U (en) | 2021-06-25 | 2021-06-25 | Fixed-focus optical system and lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121435532.XU CN215494320U (en) | 2021-06-25 | 2021-06-25 | Fixed-focus optical system and lens |
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| Publication Number | Publication Date |
|---|---|
| CN215494320U true CN215494320U (en) | 2022-01-11 |
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| CN202121435532.XU Active CN215494320U (en) | 2021-06-25 | 2021-06-25 | Fixed-focus optical system and lens |
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2021
- 2021-06-25 CN CN202121435532.XU patent/CN215494320U/en active Active
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