CN108761749B - Zoom lens - Google Patents
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- CN108761749B CN108761749B CN201810927452.2A CN201810927452A CN108761749B CN 108761749 B CN108761749 B CN 108761749B CN 201810927452 A CN201810927452 A CN 201810927452A CN 108761749 B CN108761749 B CN 108761749B
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- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 239000011521 glass Substances 0.000 claims description 56
- 239000006185 dispersion Substances 0.000 claims description 54
- 230000004075 alteration Effects 0.000 description 111
- 238000010586 diagram Methods 0.000 description 35
- 238000000034 method Methods 0.000 description 11
- 238000003384 imaging method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 4
- 206010010071 Coma Diseases 0.000 description 2
- 238000010226 confocal imaging Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004297 night vision Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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Abstract
The invention relates to a zoom lens, which comprises a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positive focal power, a fourth lens group with positive focal power and a fifth lens group with negative focal power, wherein the first lens group with positive focal power, the second lens group with negative focal power, the diaphragm, the third lens group with positive focal power, the fourth lens group with positive focal power and the fifth lens group with negative focal power are sequentially arranged from an object side to an image side along an optical axis; when the lens zooms from the wide-angle end to the telescopic end, the first lens group is fixed, the second lens group zooms, the third lens group is fixed, the fourth lens group compensates the image plane position, and the fifth lens group is fixed. The zoom lens according to the present invention is a day-and-night confocal, high magnification, constant aperture, small distortion, high image quality zoom lens.
Description
Technical Field
The invention relates to the field of optical system design, in particular to a zoom lens in the security industry.
Background
Since the end of the twentieth century, imaging quality of optical systems matching with the technologies of chips such as CCD and CMOS, which are optoelectronic devices mounted in digital cameras and video cameras, has been increasing with rapid development. Especially in the security industry, in order to meet the requirements of day-night confocal, high multiplying power and high pixel, a large number of optical lenses meeting the requirements are emerging in the market.
In recent years, imaging devices for army security, enterprise security, civil use, face recognition, face-brushing entrance, and the like have been widely used. In order to achieve the photographing of the visible light in the daytime and the photographing of the near infrared at night, the optical lens must have an imaging effect almost confocal from the visible light wavelength range to the near infrared wavelength range; in order to enable the lens to work normally in different temperature environments, the optical lens must not be virtually focused in high and low temperature environments; in order to achieve long-distance high-quality shooting, an optical lens must have a zoom lens with a long focal length range and high zoom ratio; in order to make focusing more stable, the optical lens must have a performance in which the aperture is kept constant when focusing from the wide-angle end to the telephoto end. In order to achieve a more accurate imaging, the optical distortion must be as small as possible.
The existing optical lens system has the problems that the zoom magnification is small, the distortion is large, the distortion difference between the wide-angle end and the telescopic end is large, the image quality is low, and the aperture value is not constant from the wide-angle end to the telescopic end.
Disclosure of Invention
An object of the present invention is to solve the above-described problems and to provide a zoom lens which can be confocal day and night, has a large magnification, and has a constant aperture.
In order to achieve the above object, the present invention provides a zoom lens including a first lens group having positive optical power, a second lens group having negative optical power, a stop, a third lens group having positive optical power, a fourth lens group having positive optical power, and a fifth lens group having negative optical power, which are arranged in order from an object side to an image side along an optical axis;
the lens is characterized in that when zooming from a wide-angle end to a telescopic end, the first lens group is fixed, the second lens group is zoomed, the third lens group is fixed, the fourth lens group is compensated for image plane position, and the fifth lens group is fixed; along the optical axis from the object side to the image side,
The first lens group is composed of a cemented lens group consisting of a negative focal power lens and a positive focal power lens in sequence and a positive focal power lens group;
The second lens group consists of a negative focal power lens group, a positive focal power lens and a negative focal power lens in sequence;
The third lens group consists of a three-cemented lens group consisting of a negative focal power lens, a positive focal power lens and a negative focal power lens, a cemented lens group consisting of a positive focal power lens and a negative focal power lens and a positive focal power lens in sequence;
The fourth lens group sequentially comprises a positive focal power lens and a cemented lens group consisting of a positive focal power lens and a negative focal power lens;
The fifth lens group is composed of a negative focal power lens and a positive focal power lens in sequence.
According to one aspect of the present invention, a first lens in the first lens group is a convex-concave lens from an object side to an image side along an optical axis;
the first lens in the second lens group is a convex-concave lens, and the object side surface of the last lens in the second lens group is a concave surface;
the first lens in the third lens group is a convex-concave lens;
The first lens in the fifth lens group is a convex-concave lens.
According to one aspect of the present invention, a focal length ft of the lens at a telephoto end and a focal length fw of the lens at a wide-angle end satisfy the relationship: ft/fw is more than or equal to 7 and less than or equal to 13;
The aperture value FNOw of the lens at the wide-angle end and the aperture value FNOt of the lens at the telephoto end satisfy the relation: FNOw/FNOt, 0.7-1.3.
According to one aspect of the present invention, a relationship between a distance d t from an image side of a last lens in the first lens group to an object side of a first lens in the second lens group, a distance d w from the image side of the last lens in the first lens group to the object side of the first lens in the second lens group, and a wide-angle end focal length fw of the lens is satisfied: the ratio of d t-dw to fw is more than or equal to 4 and less than or equal to 6.
According to one aspect of the present invention, the absolute value of the focal length f1 of the first lens group and the focal length f2 of the second lens group satisfies the relation: and f1/|f2| is not more than 4 and not more than 6.
According to one aspect of the present invention, a focal length f3 of the third lens group and a focal length f4 of the fourth lens group satisfy the relation: f3/f4 is more than or equal to 0.5 and less than or equal to 1.5.
According to one aspect of the present invention, a focal length f5 of the fifth lens group and a focal length fw of the lens at the wide-angle end satisfy the relation: f5/fw is more than or equal to 8.
According to one aspect of the present invention, the first lens group includes at least two low-dispersion glass lenses, the abbe number Vd1 of which satisfies: vd1 is more than or equal to 65 and less than or equal to 100.
According to an aspect of the present invention, the second lens group includes one high dispersion glass lens having an abbe number Vd2 and a refractive index Nd2 satisfying: vd2 is more than or equal to 15 and less than or equal to 25,1.75, nd2 is more than or equal to 2.1; and
At least one low dispersion glass lens having an abbe number Vd3 satisfying: vd3 is more than or equal to 60 and less than or equal to 100.
According to an aspect of the present invention, the third lens group includes at least two low-dispersion glass lenses having abbe numbers Vd4 satisfying: vd4 is more than or equal to 65 and less than or equal to 100.
According to an aspect of the present invention, the fourth lens group includes one high-dispersion glass lens having an abbe number Vd5 and a refractive index Nd5 satisfying: vd5 is more than or equal to 15 and 30,1.75, nd5 is more than or equal to 1.95; and
A low dispersion glass lens having an abbe number Vd6 satisfying: vd6 is more than or equal to 60 and less than or equal to 100.
According to the scheme of the invention, the optical quality of the lens can be ensured under the condition that the lens does not use an aspheric lens, the stability under different temperature and humidity environments is ensured, and the lens can be suitable for complex environments; the position of the diaphragm ensures a small aberration.
According to an aspect of the present invention, in zooming from the wide-angle end to the telephoto end, the first lens group is fixed, the second lens group is zoomed, the third lens group is fixed, the fourth lens group is image plane position compensated, and the fifth lens group is fixed; in the zooming process from the wide-angle end to the telescopic end, the second lens group moves from the object side to the image side and then moves to the object side, so that the focusing stroke can be reduced and the lens volume can be reduced.
According to the scheme of the invention, the large-magnification zooming can be realized in the focusing process of the zoom lens from the wide-angle end to the telescopic end, and the aperture value is relatively constant, so that focusing is easier under different object distances.
According to one scheme of the invention, high magnification and small volume can be realized, and spherical aberration and field curvature of the first lens group and the second lens group are well corrected. So that the aberration of the wide-angle end and the telescopic end can be well balanced.
According to one scheme of the invention, the balance of aberration distribution of the third lens group and the fourth lens group can be realized, so that the tolerance sensitivity of the third lens group and the fourth lens group is reduced, and the manufacturability of an assembly process is improved.
According to an aspect of the present invention, a focal length of the fifth lens group and a focal length of the lens at the wide-angle end satisfy the relation: f5/fw is more than or equal to 8. The effect of distortion and field curvature correction can be reduced by meeting the condition.
According to one aspect of the present invention, the first lens group includes at least two low dispersion glass lenses having abbe numbers Vd1 satisfying: vd1 is more than or equal to 65 and less than or equal to 100. The infrared resolution can be corrected when the condition is satisfied.
According to an aspect of the present invention, the second lens group includes one high dispersion glass lens having an abbe number Vd2 and a refractive index Nd2 satisfying: vd2 is more than or equal to 15 and less than or equal to 25,1.75, nd2 is more than or equal to 2.1; and at least one low dispersion glass lens having an abbe number Vd3 that satisfies: vd3 is more than or equal to 60 and less than or equal to 100. Satisfying this condition can reduce chromatic aberration and correct infrared resolution.
According to an aspect of the present invention, the third lens group includes at least two low-dispersion glass lenses, the abbe number Vd4 of which satisfies: vd4 is more than or equal to 65 and less than or equal to 100. Meeting this condition can reduce the amount of infrared defocus and better correct spherical aberration, coma and chromatic aberration.
According to an aspect of the present invention, the fourth lens group includes one high-dispersion glass lens having an abbe number Vd5 and a refractive index Nd5 satisfying: vd5 is more than or equal to 15 and 30,1.75, nd5 is more than or equal to 1.95; and a low dispersion glass lens having an Abbe number Vd6 satisfying: vd6 is more than or equal to 60 and less than or equal to 100. Satisfying this condition can reduce off-axis aberrations.
According to one scheme of the invention, the optical lens adopts a full glass lens structure, so that aberration can be well corrected, and imaging with small distortion and high quality can be achieved.
The optical lens can realize the function of high zoom ratio, and can reach 7-13 times.
The optical lens can achieve confocal imaging effect day and night, and night vision defocus is smaller than 8um.
The optical lens can not be in virtual focus in the environment of high temperature 80 DEG and low temperature-40 deg.
The aperture value of the optical lens is constant in the process from the wide-angle end to the telescopic end, and the variation is small.
The optical lens single part has excellent assembly tolerance and good manufacturability.
Drawings
Fig. 1A, 1B, and 1C are cross-sectional views of the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 1 (S1);
Fig. 2A, 2B, and 2C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 1 (S1);
Fig. 3A, 3B, and 3C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 1 (S1);
Fig. 4A, 4B, and 4C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) when the object distance is infinity in embodiment 1 (S1);
Fig. 5A, 5B, and 5C show near-infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 1 (S1);
fig. 6A, 6B, and 6C are cross-sectional views of the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 2 (S2);
Fig. 7A, 7B, and 7C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 2 (S2);
Fig. 8A, 8B, and 8C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 2 (S2);
Fig. 9A, 9B, and 9C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) in embodiment 2 (S2) when the object distance is infinity;
Fig. 10A, 10B, and 10C show near-infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 2 (S2);
fig. 11A, 11B, and 11C are cross-sectional views of the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 3 (S3);
Fig. 12A, 12B, and 12C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 3 (S3);
fig. 13A, 13B, and 13C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 3 (S3);
fig. 14A, 14B, and 14C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) when the object distance is infinity in embodiment 3 (S3);
Fig. 15A, 15B, and 15C show near infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 3 (S3).
Fig. 16A, 16B, and 16C are cross-sectional views of the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in example 4 (S4);
Fig. 17A, 17B, and 17C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in example 4 (S4);
fig. 18A, 18B, and 18C are spherical aberration, chromatic aberration of magnification, and distortion diagrams for the intermediate state (M) when the object distance is infinity in example 4 (S4);
Fig. 19A, 19B, and 19C are spherical aberration, chromatic aberration of magnification, and distortion diagrams for the telephoto end (T) in example 4 (S4) when the object distance is infinity;
fig. 20A, 20B, and 20C are near-infrared spherical aberration at the wide-angle end (W), intermediate state (M), and telephoto end (T) when the object distance is infinity in example 4 (S4);
Fig. 21A, 21B, and 21C are cross-sectional views of the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in example 5 (S5);
fig. 22A, 22B, and 22C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in example 5 (S5);
Fig. 23A, 23B, and 23C are spherical aberration, chromatic aberration of magnification, and distortion diagrams for the intermediate state (M) when the object distance is infinity in example 5 (S5);
Fig. 24A, 24B, and 24C are spherical aberration, chromatic aberration of magnification, and distortion diagrams for the telephoto end (T) in example 5 (S5) when the object distance is infinity;
Fig. 25A, 25B, and 25C show near infrared spherical aberration at the wide-angle end (W), intermediate state (M), and telephoto end (T) when the object distance is infinity in example 5 (S5);
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
A zoom lens according to the present invention includes a first lens group 1 having positive optical power, a second lens group 2 having negative optical power, a stop S, a third lens group 3 having positive optical power, a fourth lens group 4 having positive optical power, and a fifth lens group 5 having negative optical power, which are arranged in order from an object side to an image side along an optical axis.
In zooming from the wide-angle end to the telephoto end, the zoom lens according to the present invention has the first lens group 1 fixed, the second lens group 2 zoomed, the third lens group 3 fixed, the fourth lens group 4 image plane position compensated, and the fifth lens group 5 fixed.
According to the zoom lens of the present invention, the first lens group 1 is composed of a cemented lens group composed of a negative power lens and a positive power lens, and a positive power lens group in this order from the object side to the image side along the optical axis; the second lens group 2 consists of a negative focal power lens group, a positive focal power lens and a negative focal power lens in sequence; the third lens group 3 is composed of a three-cemented lens group consisting of a negative focal power lens, a positive focal power lens and a negative focal power lens, a cemented lens group consisting of a positive focal power lens and a negative focal power lens and a positive focal power lens in sequence; the fourth lens group 4 is composed of a positive focal power lens and a cemented lens group composed of a positive focal power lens and a negative focal power lens in sequence; the fifth lens group 5 is composed of a negative power lens and a positive power lens in this order.
According to the zoom lens of the present invention, the first lens in the first lens group 1 is a convex-concave lens from the object side to the image side along the optical axis; the first lens in the second lens group 2 is a convex-concave lens, and the object side surface of the last lens in the second lens group 2 is a concave surface; the first lens in the third lens group 3 is a convex-concave lens; the first lens in the fifth lens group 5 is a convex-concave lens.
According to the arrangement of the invention, the optical quality of the lens can be ensured under the condition that the lens does not use an aspheric lens, the stability under different temperature and humidity environments is ensured, and the lens can be suitable for complex environments; the position of the diaphragm ensures a small aberration.
In addition, in zooming from the wide-angle end to the telephoto end, the first lens group 1 is fixed, the second lens group 2 is zoomed, the third lens group 3 is fixed, the fourth lens group 4 is image plane position compensated, and the fifth lens group 5 is fixed; in the zooming process from the wide-angle end to the telescopic end, the second lens group 2 moves from the object side to the image side and then moves to the object side, so that the focusing stroke can be reduced and the lens volume can be reduced when the condition is met.
According to the zoom lens of the present invention, the focal length ft of the lens at the telephoto end and the focal length fw of the lens at the wide-angle end satisfy the relationship: ft/fw is more than or equal to 7 and less than or equal to 13; the aperture value FNOw of the lens at the wide-angle end and the aperture value FNOt of the lens at the telephoto end satisfy the relation: FNOw/FNOt, 0.7-1.3. The condition is satisfied, so that the zoom lens can realize high-magnification zooming in the focusing process from the wide-angle end to the telescopic end, and the aperture value is relatively constant, thereby being easier to focus under different object distances.
According to the zoom lens of the present invention, the distance d t from the image side of the last lens in the first lens group 1 to the object side of the first lens in the second lens group 2, the distance d w from the image side of the last lens in the first lens group 1 to the object side of the first lens in the second lens group 2, and the wide-angle end focal length fw of the lens satisfy the following relationship: the ratio of d t-dw to fw is more than or equal to 4 and less than or equal to 6. Wherein d t-dw is the axial movement stroke length of the zoom group from the wide-angle end to the telephoto end. Wherein, (d t-dw)/fw is less than or equal to 4, so that the second lens group bears overlarge focal power, the process manufacturability is poor, and the quality of the lens is unstable; when (d t-dw)/fw is more than or equal to 6, the zoom stroke is increased, the lens volume is increased, and the cost is increased.
According to the zoom lens of the present invention, the absolute value of the focal length f1 of the first lens group 1 and the focal length f2 of the second lens group 2 satisfies the relationship: and f1/|f2| is not more than 4 and not more than 6. The condition is satisfied, the large magnification and the small volume can be realized, and the spherical aberration and the field curvature of the first lens group 1 and the second lens group 2 are well corrected. So that the aberration of the wide-angle end and the telescopic end can be well balanced.
According to the zoom lens of the present invention, the focal length f3 of the third lens group 3 and the focal length f4 of the fourth lens group 4 satisfy the relation: f3/f4 is more than or equal to 0.5 and less than or equal to 1.5. Satisfying the conditional expression can realize that the aberration distribution of the third lens group 3 and the fourth lens group 4 reach balance, thereby reducing the tolerance sensitivity of the third lens group 3 and the fourth lens group 4 and improving the manufacturability of the assembly process.
According to the zoom lens of the present invention, the focal length f5 of the fifth lens group 5 and the focal length fw of the lens at the wide-angle end satisfy the relationship: f5/fw is more than or equal to 8. The effect of distortion and field curvature correction can be reduced by meeting the condition.
According to the zoom lens of the present invention, the first lens group 1 includes at least two low-dispersion glass lenses whose abbe numbers Vd1 satisfy: vd1 is more than or equal to 65 and less than or equal to 100. The infrared resolution can be corrected when the condition is satisfied.
According to the zoom lens of the present invention, the second lens group 2 includes one high-dispersion glass lens having an abbe number Vd2 and a refractive index Nd2 satisfying: vd2 is more than or equal to 15 and less than or equal to 25,1.75, nd2 is more than or equal to 2.1; and at least one low dispersion glass lens having an abbe number Vd3 that satisfies: vd3 is more than or equal to 60 and less than or equal to 100. Satisfying this condition can reduce chromatic aberration and correct infrared resolution.
According to the zoom lens of the present invention, the third lens group 3 includes at least two low-dispersion glass lenses, the abbe number Vd4 of which satisfies: vd4 is more than or equal to 65 and less than or equal to 100. Meeting this condition can reduce the amount of infrared defocus and better correct spherical aberration, coma and chromatic aberration.
According to the zoom lens of the present invention, the fourth lens group 4 includes one high-dispersion glass lens having an abbe number Vd5 and a refractive index Nd5 satisfying: vd5 is more than or equal to 15 and 30,1.75, nd5 is more than or equal to 1.95; and a low dispersion glass lens having an Abbe number Vd6 satisfying: vd6 is more than or equal to 60 and less than or equal to 100. Satisfying this condition can reduce off-axis aberrations.
According to the arrangement of the lens, the optical lens adopts a full-glass lens structure, so that aberration can be well corrected, and imaging with small distortion and high quality can be achieved.
The optical lens can realize the function of high zoom ratio, and can reach 7-13 times.
The optical lens can achieve confocal imaging effect day and night, and night vision defocus is smaller than 8um.
The optical lens can not be in virtual focus in the environment of high temperature 80 DEG and low temperature-40 deg.
The aperture value of the optical lens is constant in the process from the wide-angle end to the telescopic end, and the variation is small.
The optical lens single part has excellent assembly tolerance and good manufacturability.
The following sets of embodiments are given to specifically explain a zoom lens according to the present invention according to the above-described arrangement of the present invention. In the following five embodiments, the first lens group 1 of the zoom lens each includes 4 lenses, that is, a positive power lens group is composed of two lenses. The second lens group 2 includes 4 lenses, that is, the negative power lens group is composed of two lenses. Thus, the zoom lenses according to the five embodiments of the present invention each have 19 lenses, numbered L1 to L19 below.
Five sets of embodiment data are shown in table 1 below:
TABLE 1
Embodiment one:
fig. 1A, 1B, and 1C schematically show structural arrangement diagrams of a zoom lens according to a first embodiment of the present invention.
In the present embodiment, the total optical length of the zoom lens is ttl= 129.855mm.
Table 2 below lists relevant parameters of each lens in the zoom lens of the present embodiment:
TABLE 2
From table 2, it can be seen that:
focal length ft of the lens at the telephoto end: 69.89mm
Focal length fw of the lens at the wide-angle end: 8.66mm
Satisfies the condition (1):
ft/fw＝8.07
aperture value FNOw of the lens at wide-angle end: 1.9
Aperture value FNOt of the lens at the telescopic end: 2.05
Satisfies the condition (2):
FNOw/FNOt＝0.92
the image side surface of the last lens of the first lens group at the lens telescopic end is connected with the second lens group
Distance dt of object side of first lens: 39.5mm
The image side surface of the last lens of the first lens group at the wide angle end of the lens is connected with the second lens group
Distance dw of object side of first lens: 0.56mm
Satisfies the condition (3):
(dt-dw)/fw＝4.5
Focal length f1 of the first lens group: 72.217mm of
Focal length f2 of the second lens group: -14.05mm
Satisfying the condition (4):
f1/|f2|＝5.14
a focal length f3 of the third lens group: 38.86mm
Focal length f4 of the fourth lens group: 37.12mm
Satisfies the condition (5):
f3/f4＝1.02mm
focal length f5 of the fifth lens group: 104.95mm of
Satisfying the condition (6):
f5/fw＝12.12
the first lens group 1 has 2 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd1-2：81.59469，Vd1-4：95.10039；
the second lens group 2 has 1 piece of high dispersion glass, and abbe number and refractive index are respectively:
Vd2-12：19.31719，Nd2-12：2.00272；
and 1 low dispersion glass having an abbe number of:
Vd2-14：95.2329；
the third lens group 3 has 3 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd3-18:90.19492，Vd3-21:67.32662，Vd3-22：70.40577；
the fourth lens group 4 has 1 piece of high dispersion glass, and has abbe number and refractive index of:
Vd4-29：22.69057，Nd4-29：1.80811；
and 1 low dispersion glass having an abbe number of:
Vd4-28：95.10039。
Fig. 2A, 2B, and 2C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 1 (S1);
Fig. 3A, 3B, and 3C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 1 (S1);
Fig. 4A, 4B, and 4C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) when the object distance is infinity in embodiment 1 (S1);
Fig. 5A, 5B, and 5C show near-infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 1 (S1);
As can be seen from the above figures, the zoom lens satisfying the above conditions can correct aberration well from the visible light to near infrared wavelength range, and spherical aberration in the visible light range is substantially within ±0.03 mm; the multiplying power chromatic aberration is within +/-2.5 mm; distortion is kept within + -0.5%; the spherical aberration under infrared light is even smaller than or equal to 0.03 mm. The imaging device can realize better resolution in the intermediate state, and the visible wave band and the near infrared wave band meet confocal requirements.
Embodiment two:
Fig. 6A, 6B, and 6C schematically show structural arrangement diagrams of a zoom lens according to a second embodiment of the present invention.
In the present embodiment, the total optical length of the zoom lens is ttl= 129.454mm.
Table 3 below lists relevant parameters of each lens in the zoom lens of the present embodiment:
TABLE 3 Table 3
From table 3, it can be seen that:
Focal length ft of the lens at the telephoto end: 73.73mm of
Focal length fw of the lens at the wide-angle end: 9.06mm
Satisfies the condition (1):
ft/fw＝8.14
Aperture value FNOw of the lens at wide-angle end: 1.96
Aperture value FNOt of the lens at the telescopic end: 2.06
Satisfies the condition (2):
FNOw/FNOt＝0.95
the image side surface of the last lens of the first lens group at the lens telescopic end is connected with the second lens group
Distance dt of object side of first lens: 40mm
The image side surface of the last lens of the first lens group at the wide angle end of the lens is connected with the second lens group
Distance dw of object side of first lens: 0.7mm
Satisfies the condition (3):
(dt-dw)/fw＝4.37
Focal length f1 of the first lens group: 74.27mm of
Focal length f2 of the second lens group: -15.25mm
Satisfying the condition (4):
f1/|f2|＝4.87
A focal length f3 of the third lens group: 36.21mm of
Focal length f4 of the fourth lens group: 42.106mm of
Satisfies the condition (5):
f3/f4＝0.86
focal length f5 of the fifth lens group: -1393.2mm
Satisfying the condition (6):
f5/fw＝153.78
The first lens group 1 has 3 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd1-2：81.55958，Vd1-4：81.80222，Vd1-6：75.49634；
the second lens group 2 has 1 piece of high dispersion glass, and abbe number and refractive index are respectively:
Vd2-12：20.70537，Nd2-12：1.93117；
and 2 low dispersion glasses having abbe numbers:
Vd2-10：66.95447，Vd2-14：95.2329；
The third lens group 3 has 2 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd3-18：95.10039，Vd3-22：76.97551；
the fourth lens group 4 has 1 piece of high dispersion glass, and has abbe number and refractive index of:
Vd4-29：22.76434，Nd4-29：1.80809；
and 1 low dispersion glass having an abbe number of:
Vd4-28：95.10039。
Fig. 7A, 7B, and 7C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 2 (S2);
Fig. 8A, 8B, and 8C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 2 (S2);
Fig. 9A, 9B, and 9C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) in embodiment 2 (S2) when the object distance is infinity;
Fig. 10A, 10B, and 10C show near-infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 2 (S2);
As can be seen from the above figures, the zoom lens satisfying the above conditions can correct aberration well from the visible light to near infrared wavelength range, and spherical aberration in the visible light range is substantially within ±0.03 mm; the chromatic aberration of magnification is within +/-0.1 mm at the telescope end, so that the chromatic aberration of magnification at the telescope end has a good correcting effect; distortion is kept within + -0.5%; the spherical aberration under infrared light is basically within +/-0.02 mm. Therefore, the imaging capability with extremely small aberration and higher quality can be realized at the telescope end.
Embodiment III:
Fig. 11A, 11B, and 11C schematically show structural arrangement diagrams of a zoom lens according to a third embodiment of the present invention.
In the present embodiment, the total optical length of the zoom lens is ttl= 132.058mm.
Table 4 below lists relevant parameters of each lens in the zoom lens of the present embodiment:
TABLE 4 Table 4
From table 4, it can be seen that:
Focal length ft of the lens at the telephoto end: 68.8mm
Focal length fw of the lens at the wide-angle end: 8.5mm
Satisfies the condition (1):
ft/fw＝8.09
Aperture value FNOw of the lens at wide-angle end: 1.82
Aperture value FNOt of the lens at the telescopic end: 1.97
Satisfies the condition (2):
FNOw/FNOt＝0.92
the image side surface of the last lens of the first lens group at the lens telescopic end is connected with the second lens group
Distance dt of object side of first lens: 39mm
The image side surface of the last lens of the first lens group at the wide angle end of the lens is connected with the second lens group
Distance dw of object side of first lens: 1.4mm
Satisfies the condition (3):
(dt-dw)/fw＝4.42
focal length f1 of the first lens group: 71.8mm
Focal length f2 of the second lens group: -13.97mm
Satisfying the condition (4):
f1/|f2|＝5.14
A focal length f3 of the third lens group: 43.3mm
Focal length f4 of the fourth lens group: 33.3mm
Satisfies the condition (5):
f3/f4＝1.3
focal length f5 of the fifth lens group: 77.945mm of
Satisfying the condition (6):
f5/fw＝9.17
The first lens group 1 has 3 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd1-2：70.44116，Vd1-4：66.05245，Vd1-6：95.2329；
the second lens group 2 has 1 piece of high dispersion glass, and abbe number and refractive index are respectively:
Vd2-12：21.00001，Nd2-12：2.0052；
and 2 low dispersion glasses having abbe numbers:
Vd2-10：90.19492，Vd2-14：95.2329；
the third lens group 3 has 3 pieces of low-dispersion glass, and abbe numbers are respectively:
Vd3-18：95.2329，Vd3-19：84.47398，Vd3-22：70.36102；
the fourth lens group 4 has 1 piece of high dispersion glass, and has abbe number and refractive index of:
Vd4-29：25.38014，Nd4-29：2.00628；
and 1 low dispersion glass having an abbe number of:
Vd4-28：65.76867。
Fig. 12A, 12B, and 12C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 3 (S3);
fig. 13A, 13B, and 13C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 3 (S3);
fig. 14A, 14B, and 14C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) when the object distance is infinity in embodiment 3 (S3);
Fig. 15A, 15B, and 15C show near infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 3 (S3).
As can be seen from the above figures, the zoom lens satisfying the above conditions can correct aberrations well from the visible to near infrared wavelength range. The lens has good workability, easy tolerance assurance, and reduced sensitivity to resolution as seen in the sectional view. The spherical aberration in the visible light range is basically within +/-0.03 mm, the chromatic aberration of magnification is within +/-1.5 mm, and the distortion is within +/-0.7%; the spherical aberration under infrared light is within +/-0.03 mm. The low spherical aberration and low distortion resolution requirements can be realized by using parts which are easier to process.
Embodiment four:
Fig. 16A, 16B, and 16C schematically show a structural arrangement diagram of a zoom lens according to a fourth embodiment of the present invention.
In the present embodiment, the total optical length of the zoom lens is ttl= 135.791mm.
Table 5 below lists relevant parameters of each lens in the zoom lens of the present embodiment:
TABLE 5
From table 5, it can be seen that:
Focal length ft of the lens at the telephoto end: 67.3704mm of
Focal length fw of the lens at the wide-angle end: 9.25154mm of
Satisfies the condition (1):
ft/fw＝7.282
aperture value FNOw of the lens at wide-angle end: 2.0655
Aperture value FNOt of the lens at the telescopic end: 2.02809
Satisfies the condition (2):
FNOw/FNOt＝1.1018
The distance dt from the image side surface of the last lens of the first lens group to the object side surface of the first lens of the second lens group is as follows: 39.05mm
The distance dw from the image side surface of the last lens of the first lens group to the object side surface of the first lens of the second lens group at the wide angle end of the lens: 0.9mm
Satisfies the condition (3):
(dt-dw)/fw＝4.1236
Focal length f1 of the first lens group: 75.26mm of
Focal length f2 of the second lens group: -15.228mm
Satisfying the condition (4):
f1/|f2|＝4.8765
A focal length f3 of the third lens group: 35.722mm of
Focal length f4 of the fourth lens group: 42.539mm of
Satisfies the condition (5):
f3/f4＝0.8297
focal length f5 of the fifth lens group: 585.965mm of
Satisfying the condition (6):
f5/fw＝63.337
the first group 1 of the lens is provided with 3 pieces of low-dispersion glass, and Abbe numbers are respectively as follows:
Vd1-2：81.60838；Vd1-4：95.10039；Vd1-6：66.97239；
the second group 2 of the lens is provided with 1 piece of high-dispersion glass, and the Abbe number and the refractive index are respectively as follows:
Vd2-12：21.00001；Nd2-12：2.0052；
and 2 low dispersion glasses having abbe numbers:
Vd2-10：70.44116；Vd2-14：70.44116；
the third group 3 of the lens has 4 pieces of low-dispersion glass, and abbe numbers are respectively as follows:
Vd3-17：63.87997；Vd3-18：90.19492；Vd3-21：64.59986；
Vd3-22：70.44116；
the fourth group 4 of lenses has 1 piece of high dispersion glass, and abbe number and refractive index are respectively:
Vd4-29：22.69057；Nd4-29：1.80811；
and 1 low dispersion glass having an abbe number of:
Vd4-28：95.2329；
Fig. 17A, 17B, and 17C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 4 (S4);
fig. 18A, 18B, and 18C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 4 (S4);
Fig. 19A, 19B, and 19C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) in embodiment 4 (S4) when the object distance is infinity;
fig. 20A, 20B, and 20C show near infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 4 (S4).
As can be seen from the above figures, the zoom lens satisfying the above conditions can correct aberrations well from the visible to near infrared wavelength range. From the sectional view, it can be seen that the lens comprising several planar structures has a relatively loose tolerance requirement in terms of decentering, and the assembly parallelism is easily ensured, so that the processing yield of the product can be improved, and the sensitivity of the lens to resolution is reduced. The spherical aberration in the visible light range is basically within +/-0.08 mm, the chromatic aberration of magnification is within +/-1.5 mm, and the distortion is within +/-1%; the spherical aberration under infrared light is within +/-0.06 mm. Therefore, the method can realize looser tolerance and meet higher resolution requirements.
Fifth embodiment:
fig. 21A, 21B, and 21C schematically show a structural arrangement diagram of a zoom lens according to a fifth embodiment of the present invention.
In the present embodiment, the total optical length of the zoom lens is ttl=135 mm.
Table 6 below lists relevant parameters of each lens in the zoom lens of the present embodiment:
TABLE 6
From table 6, it can be seen that:
focal length ft of the lens at the telephoto end: 106.472mm of
Focal length fw of the lens at the wide-angle end: 8.4mm
Satisfies the condition (1):
ft/fw＝12.675
aperture value FNOw of the lens at wide-angle end: 1.89963
Aperture value FNOt of the lens at the telescopic end: 1.89718
Satisfies the condition (2):
FNOw/FNOt＝1.00129
the image side surface of the last lens of the first lens group at the lens telescopic end is connected with the second lens group
Distance dt of object side of first lens: 45.3mm
The image side surface of the last lens of the first lens group at the wide angle end of the lens is connected with the second lens group
Distance dw of object side of first lens: 0.3876mm of
Satisfies the condition (3):
(dt-dw)/fw＝5.3467
focal length f1 of the first lens group: 74.818884mm of
Focal length f2 of the second lens group: -13.157196mm
Satisfying the condition (4):
f1/|f2|＝5.6789
a focal length f3 of the third lens group: 33.3167mm of
Focal length f4 of the fourth lens group: 55.13926mm of
Satisfies the condition (5):
f3/f4＝0.604
focal length f5 of the fifth lens group: 274.496mm of
Satisfying the condition (6):
f5/fw＝32.678
the first group 1 of the lens is provided with 3 pieces of low-dispersion glass, and Abbe numbers are respectively as follows:
Vd1-2：94.95349；Vd1-4：81.61031；Vd1-6：68.39867；
the second group 2 of the lens is provided with 1 piece of high-dispersion glass, and the Abbe number and the refractive index are respectively as follows:
Vd2-12：21.00001；Nd2-12：2.0052；
and 2 low dispersion glasses having abbe numbers:
Vd2-10：63.485；Vd2-14：64.236；
the third group 3 of the lens has 4 pieces of low-dispersion glass, and abbe numbers are respectively as follows:
Vd3-17：60.59682；Vd3-18：60.59682；Vd3-21：68.39867；Vd3-22：65.06361；
the fourth group 4 of lenses has 1 piece of high dispersion glass, and abbe number and refractive index are respectively:
Vd4-29：23.576；Nd4-29：1.825；
and 1 low dispersion glass having an abbe number of:
Vd4-28：90.90005；
Fig. 22A, 22B, and 22C are spherical aberration, chromatic aberration of magnification, and distortion diagrams at the wide-angle end (W) when the object distance is infinity in embodiment 5 (S5);
Fig. 23A, 23B, and 23C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the intermediate state (M) when the object distance is infinity in embodiment 5 (S5);
fig. 24A, 24B, and 24C are spherical aberration, chromatic aberration of magnification, and distortion diagrams of the telephoto end (T) in embodiment 5 (S5) when the object distance is infinity;
fig. 25A, 25B, and 25C show near infrared spherical aberration at the wide-angle end (W), the intermediate state (M), and the telephoto end (T) when the object distance is infinity in embodiment 5 (S5).
As can be seen from the above embodiments, the zoom lens satisfying the above conditions can correct aberrations well from the visible to near infrared wavelength range. The spherical aberration in the visible light range is basically within +/-0.08 mm, the multiplying power chromatic aberration is within +/-1.5 mm, the distortion is within +/-1%, and the positive distortion is always kept; the spherical aberration under infrared light is also within +/-0.05 mm. The high-magnification zoom of about 12 times can be realized, the aperture is kept basically constant, and the resolution is high.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A zoom lens includes a first lens group (1) having positive optical power, a second lens group (2) having negative optical power, a stop (S), a third lens group (3) having positive optical power, a fourth lens group (4) having positive optical power, and a fifth lens group (5) having negative optical power, which are arranged in this order from an object side to an image side along an optical axis;
the lens is characterized in that when the lens zooms from a wide-angle end to a telescopic end, the first lens group (1) is fixed, the second lens group (2) zooms, the third lens group (3) is fixed, the fourth lens group (4) compensates the image plane position, and the fifth lens group (5) is fixed; characterized in that, from the object side to the image side along the optical axis,
The first lens group (1) consists of a cemented lens group consisting of a negative focal power lens and a positive focal power lens group in sequence, and the first lens group (1) consists of four lenses;
the second lens group (2) consists of a negative focal power lens group, a positive focal power lens and a negative focal power lens in sequence, and the second lens group (2) consists of four lenses;
The third lens group (3) is composed of a three-cemented lens group consisting of a negative focal power lens, a positive focal power lens and a negative focal power lens, a cemented lens group consisting of a positive focal power lens and a negative focal power lens and a positive focal power lens in sequence;
the fourth lens group (4) is sequentially composed of a positive focal power lens and a cemented lens group composed of a positive focal power lens and a negative focal power lens;
The fifth lens group (5) is composed of a negative focal power lens and a positive focal power lens in sequence.
2. A zoom lens according to claim 1, wherein the first lens in the first lens group (1) is a convex-concave lens from an object side to an image side along an optical axis;
The first lens in the second lens group (2) is a convex-concave lens, and the object side surface of the last lens in the second lens group (2) is a concave surface;
the first lens in the third lens group (3) is a convex-concave lens;
the first lens in the fifth lens group (5) is a convex-concave lens.
3. The zoom lens according to claim 1 or 2, wherein a focal length ft of the lens at a telephoto end and a focal length fw of the lens at a wide-angle end satisfy a relation: ft/fw is more than or equal to 7 and less than or equal to 13;
The aperture value FNOw of the lens at the wide-angle end and the aperture value FNOt of the lens at the telephoto end satisfy the relation: FNOw/FNOt, 0.7-1.3.
4. The zoom lens according to claim 1 or 2, wherein a relation between a distance d t from an image side of a last lens in the first lens group (1) to an object side of a first lens in the second lens group (2), a distance d w from the image side of the last lens in the first lens group (1) to the object side of the first lens in the second lens group (2), and a wide-angle end focal length fw of the lens is satisfied: the ratio of d t-dw to fw is more than or equal to 4 and less than or equal to 6.
5. Zoom lens according to claim 1 or 2, characterized in that the absolute value of the focal length f1 of the first lens group (1) and the focal length f2 of the second lens group (2) satisfies the relation: and f1/|f2| is not more than 4 and not more than 6.
6. A zoom lens according to claim 1 or 2, wherein a focal length f3 of the third lens group (3) and a focal length f4 of the fourth lens group (4) satisfy the relation: f3/f4 is more than or equal to 0.5 and less than or equal to 1.5.
7. A zoom lens according to claim 1 or 2, wherein a focal length f5 of the fifth lens group (5) and a focal length fw of the lens at the wide-angle end satisfy the relation: f5/fw is more than or equal to 8.
8. Zoom lens according to claim 1 or 2, characterized in that the first lens group (1) comprises at least two low-dispersion glass lenses, the abbe number Vd1 of which satisfies: vd1 is more than or equal to 65 and less than or equal to 100.
9. Zoom lens according to claim 1 or 2, characterized in that the second lens group (2) comprises one high dispersion glass lens having an abbe number Vd2 and a refractive index Nd2 satisfying: vd2 is more than or equal to 15 and less than or equal to 25,1.75, nd2 is more than or equal to 2.1; and
At least one low dispersion glass lens having an abbe number Vd3 satisfying: vd3 is more than or equal to 60 and less than or equal to 100.
10. Zoom lens according to claim 1 or 2, characterized in that the third lens group (3) comprises at least two low-dispersion glass lenses, the abbe number Vd4 of which satisfies: vd4 is more than or equal to 65 and less than or equal to 100.
11. Zoom lens according to claim 1 or 2, characterized in that the fourth lens group (4) comprises one high dispersion glass lens having an abbe number Vd5 and a refractive index Nd5 satisfying: vd5 is more than or equal to 15 and 30,1.75, nd5 is more than or equal to 1.95; and
A low dispersion glass lens having an abbe number Vd6 satisfying: vd6 is more than or equal to 60 and less than or equal to 100.
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| CN110927942B (en) * | 2019-11-29 | 2022-04-01 | 中船重工海为郑州高科技有限公司 | Optical zoom imaging device of photoelectric detection system for foreign objects on airport runway |
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