CN218995769U - Zoom lens with small zoom - Google Patents
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- CN218995769U CN218995769U CN202223327841.2U CN202223327841U CN218995769U CN 218995769 U CN218995769 U CN 218995769U CN 202223327841 U CN202223327841 U CN 202223327841U CN 218995769 U CN218995769 U CN 218995769U
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Abstract
The utility model discloses a small zoom lens, which comprises a lens barrel and a lens group, wherein the lens group comprises a first lens group with positive focal power, a diaphragm component, a second lens group with negative focal power, an ICR component and a photosensitive chip, the first lens group moves along the optical axis direction to realize zooming, the second lens group moves along the optical axis direction to realize focusing, and the second lens group and the small zoom lens are sequentially arranged from an object side to an image side and meet the following conditions: fw/f2 is more than or equal to 0.2 and less than or equal to 0.4,0.9 and f is more than or equal to T And F2 is less than or equal to 1.2, and the maximum field angle of the small zoom lens at the wide angle end is more than 150 degrees, the minimum field angle of the telescopic end is less than 35 degrees, the maximum aperture F of the small zoom lens is less than or equal to 1.3, and the focal length zoom ratio is more than or equal to 3.0, so as to provide the small zoom lens with larger variable magnification and larger aperture.
Description
Technical Field
The utility model relates to the technical field of optics, in particular to a small zoom lens.
Background
The working principle of the small zoom optical system is as follows: the two groups of optical components move relative to the image plane to realize focal length change.
The existing similar products capable of realizing the zoom function are small in general zoom ratio, small in aperture, poor in picture effect in low-illumination environment and limited in application range. And the product with the same multiplying power performance has complex structure, high cost and heavy weight. Many small zoom products are fixed apertures, and cannot realize the function of controlling exposure by adjusting the aperture under different environments, and cannot adjust the depth of field.
Disclosure of Invention
The utility model mainly aims to provide a small zoom lens, and aims to provide a small zoom lens with larger zoom ratio and larger aperture.
In order to achieve the above object, the present utility model provides a small magnification zoom lens having an object side and an image side disposed opposite to each other in an optical axis direction, the small magnification zoom lens comprising:
a lens barrel; the method comprises the steps of,
the lens group comprises a first lens group with positive focal power, a diaphragm component, a second lens group with negative focal power, an ICR component and a photosensitive chip which are sequentially arranged from the object side to the image side, wherein the first lens group and the second lens group are movably arranged on the lens barrel along the optical axis direction, the first lens group moves along the optical axis direction so as to enable the small zoom lens to focus, and the second lens group moves along the optical axis direction so as to enable the small zoom lens to zoom;
the first lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from the object side to the image side, and the second lens group comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a tenth lens with negative focal power, which are sequentially arranged from the object side to the image side;
the focal length of the second lens group is f2, the focal length of the small zoom lens at the wide-angle end is fw, and the focal length of the small zoom lens at the telescopic end is f T Wherein the small magnification-varying zoom lens satisfies the following conditions: fw/f2 is more than or equal to 0.2 and less than or equal to 0.4,0.9 and f is more than or equal to T /f2≤1.2。
Optionally, among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens, at most four lenses are provided as glass lenses, and the other lenses are provided as plastic lenses.
Optionally, the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens and the tenth lens are plastic lenses.
Optionally, the fourth lens is provided as a glass lens.
Optionally, the focal length of the first lens group is f1, and the first lens group and the second lens group satisfy the following conditions: -1.1.ltoreq.f1/f2.ltoreq.0.6.
Optionally, the refractive index of the fourth lens is nd4, wherein nd4 is more than or equal to 1.42 and less than or equal to 1.6;
the Abbe number of the fourth lens is vd4, wherein vd4 is more than or equal to 65 and less than or equal to 96.
Optionally, the refractive index of the sixth lens is nd6, wherein nd6 is 1.58-1.64;
the Abbe number of the sixth lens is vd6, wherein vd6 is more than or equal to 20 and less than or equal to 30.
Optionally, the refractive index of the ninth lens is nd9, wherein nd9 is 1.62.ltoreq.nd 9.ltoreq.1.69.
Optionally, the seventh lens and the eighth lens are adhesively connected.
Optionally, the diaphragm assembly is provided as an adjustable diaphragm.
In the technical scheme provided by the utility model, a first lens group, a diaphragm component, a second lens group and an ICR component are sequentially arranged from an object side to an image side, the first lens group and the second lens group are movably arranged on the lens barrel along the optical axis direction, wherein the first lens group is used for focusing, the second lens group is used for zooming, the first lens group and the second lens group move cooperatively along the optical axis direction, so that the small zoom lens zooms from a wide angle end to a telescopic end, the small zoom lens keeps imaging of the imaging surface clear in the zooming process, the first lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from the object side to the image side, the second lens group comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a tenth lens with negative focal power which are sequentially arranged from the object side to the image side, and the small zoom lens is positioned at a maximum field angle of more than 150 degrees at the wide angle end and at a minimum field angle of less than 35 degrees at the telephoto end by reasonably arranging the two lens groups and limiting focal length ratios of the wide angle end and the second lens group of the small zoom lens, wherein the maximum F-number F of the small zoom lens is less than or equal to 1.3, and the focal length zoom ratio is more than or equal to 3.0 so as to provide the small zoom lens with larger variable magnification and larger aperture.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a small zoom lens at a wide-angle end according to the present utility model;
FIG. 2 is a schematic view of the zoom lens of FIG. 1 at the telephoto end;
fig. 3 is an aberration diagram of the small magnification-varying zoom lens in fig. 1 at the wide-angle end;
fig. 4 is a field curvature map and a distortion map of the small magnification-varying zoom lens in fig. 1 at the wide-angle end;
FIG. 5 is an aberration diagram of the small magnification zoom lens of FIG. 2 at the telephoto end;
fig. 6 is a field curvature map and a distortion map when the small magnification zoom lens in fig. 2 is at the telephoto end.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The working principle of the small zoom optical system is as follows: the two groups of optical components move relative to the image plane to realize focal length change. The existing similar products capable of realizing the zoom function are small in general zoom ratio, small in aperture, poor in picture effect in low-illumination environment and limited in application range. And the product with the same multiplying power performance has complex structure, high cost and heavy weight. Many small zoom products are fixed apertures, and cannot realize the function of controlling exposure by adjusting the aperture under different environments, and cannot adjust the depth of field.
In order to solve the above-mentioned problems, the present utility model provides a small zoom lens, and fig. 1 to 3 are specific embodiments of the small zoom lens provided by the present utility model.
Referring to fig. 1, the zoom lens has an object side and an image side disposed opposite to each other in an optical axis direction, and includes a barrelThe lens group comprises a first lens group with positive focal power, a diaphragm component, a second lens group with negative focal power, an ICR component and a photosensitive chip which are sequentially arranged from the object side to the image side, wherein the first lens group and the second lens group are movably arranged on the lens barrel along the optical axis direction, the first lens group moves along the optical axis direction so as to enable the small zoom lens to focus, and the second lens group moves along the optical axis direction so as to enable the small zoom lens to zoom, and the first lens group comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, and the second lens group comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, a eighth lens with negative focal power, a tenth lens with negative focal power, and a ninth lens with positive focal power which are sequentially arranged from the object side to the image side; the focal length of the second lens group is f2, the focal length of the small zoom lens at the wide-angle end is fw, and the focal length of the small zoom lens at the telescopic end is f T Wherein the small magnification-varying zoom lens satisfies the following conditions: fw/f2 is more than or equal to 0.2 and less than or equal to 0.4,0.9 and f is more than or equal to T /f2≤1.2。
According to the technical scheme, a first lens group, a diaphragm assembly, a second lens group and an ICR assembly are sequentially arranged from an object side to an image side, the first lens group and the second lens group are movably arranged on the lens barrel along the optical axis direction, the first lens group is used for zooming, the second lens group is used for focusing, the first lens group and the second lens group move cooperatively along the optical axis direction, so that the small zoom lens zooms to a telescopic end from a wide angle end, the small zoom lens keeps imaging sharpness of an imaging surface in a zooming process, the first lens group comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power, the first lens group comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with positive focal power and a focal power, the second lens with a focal power is more than or equal to a first focal length of 3, the second lens with a focal power is more than or equal to a second focal length of a maximum of 150F, and a focal length of a small focal length of a maximum of a small F is provided, and a focal length of a small F is more than a focal length of a small focal length of a maximum of a small F is provided.
Specifically, in the present embodiment, among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, at most four lenses are provided as glass lenses, and the other lenses are provided as plastic lenses.
Specifically, the glass lens has the characteristics of high hardness, high wear resistance and long service life. And the full glass lens has stable chemical property, is not easy to be influenced by expansion caused by heat and contraction caused by cold, and is not easy to be corroded. The all-glass lens can well resist the problem of deformation of the lens caused by heating, and the high precision of the lens can be maintained for a long time.
In this embodiment, the fourth lens is a glass lens, but the cost is increased because the price of the all-glass lens is relatively high, the price of the lens using the all-glass lens is slightly high, and the impact resistance of the all-glass lens is also weak.
In this embodiment, the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens and the tenth lens are plastic lenses. Therefore, through glass-plastic mixing and collocation, the situation that the small-magnification zoom lens can change at high and low temperatures in actual use is guaranteed, enough definition of the lens is guaranteed in a high and low temperature environment under the focusing condition of normal temperature of 20 ℃, the weight of the lens is reduced, the cost is reduced, and the impact resistance of the lens is improved.
Specifically, the focal length of the first lens group is f1, and the first lens group and the second lens group satisfy the following conditions: -1.1.ltoreq.f1/f2.ltoreq.0.6. Through setting up of focal length setting ratio, can make the minimum focal length of the focal length of little zoom lens reach 3.2mm, can control the maximum focal length of the focal length of little zoom lens reaches 10mm, realizes multiplying power 3x.
Specifically, the refractive index of the fourth lens is nd4, wherein nd4 is more than or equal to 1.42 and less than or equal to 1.6; the abbe number of the fourth lens is vd4, wherein 65.ltoreq.vd4.ltoreq.96, and in the present embodiment, the fourth lens is provided as a glass lens.
Specifically, in the present embodiment, the refractive index of the sixth lens is nd6, wherein nd6 is 1.58.ltoreq.nd 6.ltoreq.1.64; and the Abbe number of the sixth lens is vd6, wherein vd6 is more than or equal to 20 and less than or equal to 30.
Specifically, in the present embodiment, the refractive index of the ninth lens is nd9, wherein nd9 is 1.62.ltoreq.nd 9.ltoreq.1.69.
Specifically, in order to make the optical component improve the image quality of the optical system, reduce the optical energy loss, increase the imaging definition, protect the scale surface, further optimize the processing flow to meet the design requirement, in this embodiment, the seventh lens and the eighth lens are glued and connected. The focal power is properly distributed, the thermal parameters of the glass materials are combined, the aberration is well corrected, the effect of high and low temperature athermalization is realized, the color difference is effectively reduced, the effect of sharing the focal plane and simultaneously achieving clarity of imaging in the visible light wave band and the near infrared wave band is achieved, and the day and night sharing requirement is met.
Further, in order to achieve different depths of field, the light flux is adjusted, in this embodiment the diaphragm assembly is arranged as an adjustable diaphragm. Therefore, the adjustment of the depth of field under different multiplying powers and the adjustment of the light flux under different environments can be realized, so that a better imaging effect is achieved, or the picture has richer layers.
In the small zoom lens, the aperture component limits the on-axis beam aperture to block part of light rays in the zooming process, reduces light spots, improves image contrast and is beneficial to improving image quality.
It is understood that the surface of the photosensitive chip facing the object side is an imaging surface.
The small zoom lens further comprises an optical filter, wherein the optical filter is positioned between the second lens group and the imaging surface, and the optical filter can effectively filter stray light of a non-working wave band so as to reduce optical noise and reduce difficulty for a subsequent photoelectric module processing part, thereby improving imaging quality.
Specifically, the imaging surface may be understood as a surface of the photosensitive chip facing the object side, that is, may be a surface of an imaging element such as a CCD or a CMOS, and it may be understood that light carrying subject information may sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, and finally be imaged on the imaging surface.
Specifically, in this embodiment, the surface shape, radius of curvature, thickness and cone coefficient of the lens are shown in the following table:
TABLE 1
Further, in the present embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:
where c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), k (Conic) is the Conic coefficient, (the surface shape curve is hyperbolic when the k coefficient is smaller than-1, parabolic when the k coefficient is equal to-1, elliptical when the k coefficient is between-1 and 0, circular when the k coefficient is equal to 0, and oblate when the k coefficient is greater than 0), referring to the following table 2, the shape and size of the aspherical surfaces of the object side and the image side of the lens can be set by the above parameters.
Table 2 aspherical coefficients corresponding to aspherical lenses
In another embodiment, the lens' profile, radius of curvature, thickness and cone coefficients are shown in the following table:
TABLE 3 Table 3
Referring to table 4 below, in this embodiment, the shape and size of the object-side and image-side aspheres can be set by the above parameters.
Table 4 aspherical coefficients corresponding to aspherical lenses
In yet another embodiment, the lens' profile, radius of curvature, thickness and cone coefficients are shown in the following table:
TABLE 5
Referring to table 6 below, in this embodiment, the shape and size of the object-side and image-side aspheres can be set by the above parameters.
Table 6 aspherical coefficients corresponding to aspherical lenses
In this embodiment, please refer to fig. 1 to 2, which are schematic structural diagrams of the small zoom lens at the wide-angle end and the telephoto end, respectively; and the position of each lens group in the small zoom lens is schematically shown.
Fig. 3 to 4, fig. 3 is an aberration diagram (longitudinal aberration) of the zoom lens at the wide-angle end, and fig. 4 is a field curvature diagram (field curvature) and a distortion diagram (distortion) of the zoom lens at the wide-angle end, wherein the wavelength λ includes a wavelength band of 435-656nm, and S, T in the diagram is an aberration corresponding to a sagittal image plane and a meridional image plane, respectively.
Referring to fig. 5 to 6, fig. 5 is a spherical aberration diagram of the zoom lens at the telephoto end, and fig. 6 is a field curvature diagram and a distortion diagram of the zoom lens at the telephoto end, wherein a wavelength λ includes a wavelength band of 435-656nm, and S, T in the diagram is aberration corresponding to a sagittal image plane and a meridional image plane, respectively.
As is clear from the above-described figures, the small magnification zoom lens of the present embodiment can obtain good correction of spherical aberration, curvature of field, and distortion at the wide-angle end and the telephoto end, respectively.
In summary, the small zoom lens of the utility model adopts a two-group structure, the focal length can be changed at a wide angle end of <3.2mm and a telescopic end of >10mm, the optical distortion of the wide angle end and the telescopic end is smaller than 60%, so that the small zoom lens is positioned at a maximum field angle of more than 150 degrees at the wide angle end and at a minimum field angle of less than 35 degrees at the telescopic end, the maximum F-number F of the small zoom lens is less than or equal to 1.3, the focal length zoom ratio is greater than or equal to 3.0, and the small zoom lens has the effects of wide angle, small distortion and large zoom; and the small zoom lens comprises a glass lens, so that good optical performance is fully ensured.
The small zoom lens can use an adjustable aperture 3, has an aperture number of 1.3 at the wide-angle end and has extremely high photosensitive performance under the condition that the aperture number of 2.8 at the telephoto end, and a clearer picture can be shot even in a darker environment.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. A small magnification-varying zoom lens having an object side and an image side disposed opposite to each other in an optical axis direction, the small magnification-varying zoom lens comprising:
a lens barrel; the method comprises the steps of,
the lens group comprises a first lens group with positive focal power, a diaphragm component, a second lens group with negative focal power, an ICR component and a photosensitive chip which are sequentially arranged from the object side to the image side, wherein the first lens group and the second lens group are movably arranged on the lens barrel along the optical axis direction, the first lens group moves along the optical axis direction so as to enable the small zoom lens to focus, and the second lens group moves along the optical axis direction so as to enable the small zoom lens to zoom;
the first lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from the object side to the image side, and the second lens group comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a tenth lens with negative focal power, which are sequentially arranged from the object side to the image side;
the focal length of the second lens group is f2, the focal length of the small zoom lens at the wide-angle end is fw, and the focal length of the small zoom lens at the telescopic end is f T Wherein the small magnification-varying zoom lens satisfies the following conditions: fw/f2 is more than or equal to 0.2 and less than or equal to 0.4,0.9 and f is more than or equal to T /f2≤1.2。
2. The small magnification-varying zoom lens according to claim 1, wherein among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, at most four lenses are provided as glass lenses, and the other lenses are provided as plastic lenses.
3. The small magnification-varying zoom lens of claim 2, wherein the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are plastic lenses.
4. The small magnification zoom lens of claim 2, wherein the fourth lens is provided as a glass lens.
5. The small magnification zoom lens according to claim 1, wherein a focal length of the first lens group is f1, and the first lens group and the second lens group satisfy the following conditions: -1.1.ltoreq.f1/f2.ltoreq.0.6.
6. The small magnification-varying zoom lens according to claim 1, wherein a refractive index of the fourth lens is nd4, wherein nd4 is 1.42.ltoreq.nd 4.ltoreq.1.6;
the Abbe number of the fourth lens is vd4, wherein vd4 is more than or equal to 65 and less than or equal to 96.
7. The small magnification-varying zoom lens according to claim 1, wherein a refractive index of the sixth lens is nd6, wherein nd6 is 1.58.ltoreq.nd 6.ltoreq.1.64;
the Abbe number of the sixth lens is vd6, wherein vd6 is more than or equal to 20 and less than or equal to 30.
8. The small magnification-varying zoom lens according to claim 1, wherein the refractive index of the ninth lens is nd9, wherein nd9 is 1.62.ltoreq.nd 9.ltoreq.1.69.
9. The small magnification-varying zoom lens of claim 1, wherein the seventh lens and the eighth lens are cemented.
10. The small magnification zoom lens of claim 1, wherein the diaphragm assembly is configured as an adjustable diaphragm.
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