CN104749755A - Compact tri-component high-zoom ratio continuous zoom lens - Google Patents

Compact tri-component high-zoom ratio continuous zoom lens Download PDF

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Publication number
CN104749755A
CN104749755A CN201510147959.2A CN201510147959A CN104749755A CN 104749755 A CN104749755 A CN 104749755A CN 201510147959 A CN201510147959 A CN 201510147959A CN 104749755 A CN104749755 A CN 104749755A
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lens
zoom
group
negative
positive
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CN201510147959.2A
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CN104749755B (en
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王建立
李宏壮
李义
刘欣悦
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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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 +-+

Abstract

The invention belongs to the technical field of optical system design and discloses a compact tri-component high-zoom ratio continuous zoom lens and aims to overcome the problems of the zoom lens of complicated structure and long size. The compact tri-component high-zoom ration continuous zoom lens comprises a positive-power front fixing unit, a negative-power zooming unit and a positive-power compensation unit. A variable aperture is fixed at the front end of the compensation unit and moves along with the same. The front fixing unit comprises a double bonding lens unit and a single lens. The double bonding lens unit comprises a meniscus negative lens and a double-convex positive lens. The single lens is in the convex-plane shape. The variable unit comprises a negative lens and a negative-power double bonding lens. The negative lens is in double concave shape. The double bonding lens is in the structure bonding the negative lens and the positive lens. The compensation unit comprises a first double bonding lens, a second double bonding lens and the third double bonding lens. The first and second double bonding lens are in the positive power, and the third double bonding lens is in the negative power. A single lens close to an image surface is in a thick meniscus shape adopting high refractive index and used for field curvature and astigmatism correction.

Description

The large zoom ratio zoom lens of compact three constituent element
Technical field
The invention belongs to Optical System Design technical field, be specifically related to the large zoom ratio zoom lens of a kind of compact three constituent element.
Background technology
Along with the development of modern society and science and technology, zoom lens is widely adopted in the such as various fields such as security protection, monitoring, by the combination with TV camera shooting technique, can carry out detailed observed and recorded to distant object, also can search for target on a large scale.For realizing remote high-resolution imaging, require the focal length long enough of camera lens focal length end; And for making systematic observation wide ranges, require that again camera lens short Jiao end focal length is enough short; In addition for the ease of the movement of mechanism design and camera lens, installation and use, wish that lens optical structure is simple, overall dimensions is compact.Therefore the zoom lens that large zoom ratio, long-focus, compact conformation, picture element are excellent favors by user.
But the length of general camera lens is close with its focal length, and therefore the length of long focal length lens is also corresponding longer.In addition when zoom ratio is large, the amount of movement of zoom constituent element is also comparatively large, and aberration correction is also difficult, and these both increase again the difficulty of compact lenses design.Therefore how to make long-focus, large zoom ratio zoomlens area of bed end, simple and compact for structure, be one of development emphasis in optical design always.
At present zoom lens's form the most popular is mechanical compensation four groups of formula structures, namely comprise front fix group, zoom group, compensating group, latter fixing group.But this structure is comparatively complicated, because constituent element is more, the reduction of length is restricted.This four groups of formula forms of the many employings of large zoom ratio camera lens of current bibliographical information, due to the restriction of length, zoom ratio is generally no more than 50 times.And other forms, be only adopt in the little multiplying power system of 4 ~ 5 in zoom ratio as two groups of formulas, three groups of formulas etc.How to develop the difficult problem that zoom ratio is large, focal length is long, structure is simple, compact zoom lens is optical design arts always.
Summary of the invention
The present invention is the problem overcoming existing large multiplying power, long-focus zoom lens complex structure, size length, the large zoom ratio zoom lens of compact three constituent element is proposed, adopt three Component Structures, long-focus, large zoom ratio camera lens is made to ensure, under the prerequisite that image quality is excellent, to realize the simple, compact of structure.
For achieving the above object, the technical solution used in the present invention is:
The large zoom ratio zoom lens of compact three constituent element, is characterized in that, it is followed successively by front fixing group of positive light coke, the compensating group of the zoom group of negative power and positive light coke from left to right, and iris is fixed on compensating group front end, moves with compensating group;
Front fixing group comprises cemented doublet and simple lens; Cemented doublet is negative, positive structure, and wherein negative lens is meniscus shaped lens, and positive lens is lenticular lens; Simple lens is convexo-plane lens;
Zoom group comprises the cemented doublet of negative lens and negative power; Simple lens is double concave; Cemented doublet is negative lens and positive lens glued construction;
The focal power that compensating group comprises the first cemented doublet and the second cemented doublet is that just the 3rd cemented doublet focal power is negative; Simple lens near image planes adopts the thick falcate of high-index material, for the correction to the curvature of field and astigmatism.
The condition that each constituent element focal power meets is as follows,
5＜|f A/f B|＜8
1.2＜|f C/f B|＜2
d BC_L/f B＞0
In formula: f afor front fixing group of focal length, f bfor zoom group focal length, f cfor compensating group focal length, d bC_Lfor focal length position end zoom group and compensating group interval.
Positive and negative lens in 3rd cemented doublet adopt especial dispersion glass H-FK61 and TF3 respectively.
Beneficial effect of the present invention: for reaching large zoom ratio, adopt the just group compensation way changing root, namely zoom group focal power is negative, compensating group focal power is just, compensated curve is through changing root point, realizing the change of multiplying power more than 10 times by changing root point to short Jiao's end, by the change of changing root point and to realize to focal length end multiplying power more than 5 times, thus making the zoom ratio realizing more than 50 times in whole zoom curve ranges.For making compact conformation, compensating group is designed to the type of dolly-out,ing dolly-back of focal power reach, interarea is shifted out forward outside mirror group, and when Gaussian parameter is calculated, focal length end zoom group and compensating group are spaced apart negative, thus realize the reduction of system overall length in the compensated curve selections stage; Utilize structure overall length of dolly-out,ing dolly-back to be less than the feature of focal length simultaneously, reduce back work distance from, make the thick lens design phase reduce length further.
Accompanying drawing explanation
Fig. 1 is compact three constituent element of the present invention large zoom ratio zoom lens optical texture.
Fig. 2 is the zoom compensated curve of the embodiment of the present invention, and (1) is zoom group and compensating group amount of movement and cam angle relation, and (2) are system focal length and cam angle relation.
Fig. 3 is zoom system at the Gaussian optics structural drawing of short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions.
Fig. 4 is the actual index path of zoom lens in short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions of embodiment.
Fig. 5 is zoom lens at the MTF curve of short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions.
Fig. 6 be zoom lens short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions aberration curve figure, comprise spherical aberration curve, astigmatism and curvature of field curve, distortion curve.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
Adopt three Component Structures, as shown in Figure 1, comprise front fixing group 1 of positive light coke, the compensating group 4 of the zoom group 2 of negative power and positive light coke, iris 3 is fixed on compensating group 4 front end, moves with compensating group.Eliminate latter fixing group compared with four groups of conventional formulas, simplify system architecture.
For reaching large zoom ratio, adopt the just group compensation way changing root, namely zoom group focal power is negative, compensating group focal power is just, compensated curve is through changing root point, realizing the change of multiplying power more than 10 times by changing root point to short Jiao's end, by the change of changing root point and to realize to focal length end multiplying power more than 5 times, thus making the zoom ratio realizing more than 50 times in whole zoom curve ranges.
Before in three groups of structures, fixing group 1 comprises one piece of cemented doublet 1-1 and piece simple lens 1-2.Cemented doublet 1-1 is negative, positive structure, and negative lens is wherein falcate, and adopt the flint glass of high index of refraction, positive lens is lenticular, adopts low-refraction, especial dispersion glass HFK61.Simple lens 1-2 is convexo-plane, also adopts especial dispersion glass HFK61.
Zoom group 2 comprises the cemented doublet 2-2 of one piece of negative lens 2-1 and piece negative power.Simple lens 2-1 is double concave, adopts the crown glass of low dispersion.Cemented doublet 2-2 is negative, positive structure, and negative lens wherein adopts especial dispersion glass TF3, and positive lens adopts the flint glass of high index of refraction, high dispersion.
Compensating group 4 comprises cemented doublet and one piece of simple lens of three pieces of positive and negative structures.Wherein the focal power of front two pieces of cemented doublets 4-1,4-2 is just, the 3rd piece of cemented doublet 4-3 focal power is negative, and the positive and negative lens in cemented doublet 4-3 adopt especial dispersion glass H-FK61 and TF3 respectively; The thick falcate of high-index material is adopted, for the correction to the curvature of field and astigmatism near the simple lens 4-4 of image planes.
For making compact conformation, compensating group 4 being designed to the type of dolly-out,ing dolly-back of focal power reach, interarea is shifted out forward outside mirror group, when Gaussian parameter is calculated, focal length end zoom group 2 and compensating group 4 are spaced apart negative, thus realize the reduction of system overall length in the compensated curve selections stage; Utilize structure overall length of dolly-out,ing dolly-back to be less than the feature of focal length simultaneously, reduce back work distance from, make the thick lens design phase reduce length further.
Iris 3 is fixed on compensating group 4 front end, moves with compensating group.
The condition that each constituent element focal power of the present invention meets is:
5＜|f A/f B|＜8
1.2＜|f C/f B|＜2
d BC_L/f B＞0
F in formula afor front fixing group of focal length, f bfor zoom group focal length, f cfor compensating group focal length, d bC_Lfor focal length position end zoom group and compensating group interval.
Embodiment:
Be applied to the large multiplying power lens optical system of long-focus that high resolving power monitors, this system uses the visible ray that wave band is 486nm ~ 656nm, focal length 12.5mm ~ 750mm, zoom ratio 60 times, relative aperture 1/2.8 ~ 1/7, field angle 38.5 ° ~ 0.66 °, camera adopts 2/3 〞 CCD.
First carry out Gaussian optics calculating in embodiment, thus select the most rational Gaussian parameter, be finally defined as:
1)f A/f B＝-6.2；
2)f C/f B＝-1.78；
3)d BC_L/f B＝0.45；
4) zoom group multiplying power: m b=-2.2 ~-0.22;
5) compensating group multiplying power: m c=-1.82 ~-0.31;
6) normalization coefficient: f b=-30mm.
Then carry out thick lens design, select each Component Structure form and lens material according to aforementioned rule, the design result optical parametric of embodiment is as table 1, and system is made up of 8 groups of 13 lens.
1) fixing group maximum clear aperture: 107mm, the maximum clear aperture 28mm of zoom group, the maximum clear aperture 30mm of compensating group before system;
2) anter is to image planes overall length: 368mm;
3) back work distance is from 18.32mm ~ 91.17mm;
4) zoom group helical pitch: 123.5mm;
5) compensation rate: 72.85mm.
Table 1:
As shown in Figure 2, zoom compensated curve is level and smooth, and cam lift angle pressure is little, is easy to realize; And zoom group and compensating group are spaced apart negative value at focal length end interarea, make Gaussian optics calculation stages namely compress overall length; Be conducive to the compact design of system.
As shown in Figure 3, zoom system is at the Gaussian optics structural drawing of short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions, when camera lens is changed to focal length by short Jiao, front fixing group is motionless, zoom group moves to image planes direction, compensating group fixes forward prescription to movement, namely zoom group and compensating group close, and make zoom group and compensating group be spaced apart negative value at focal length end.
As shown in Figure 4, zoom lens can find out at the actual index path of short burnt f12.5mm, middle burnt f186mm and focal length 750mm tri-positions, in lens zoom process, and front fixing group and target surface constant distance; Short burnt position zoom group and front fixing group of interval minimum, now compensating group and the target surface distance back work distance of camera lens (i.e. from) also minimum; Focal length position zoom group and front fixing group of interval maximum, now compensating group and the target surface distance back work distance of camera lens (i.e. from) also maximum, and interval between zoom group and compensating group is minimum, but still ensures certain minimum Center Gap.
As shown in Figure 5, system is short, in, on focal length each position axle, visual field is greater than 0.6 at 50lp/mm frequency place MTF, peripheral field is greater than 0.3.
As shown in Figure 6, system is short, in, focal length each position aberration corrected preferably, maximum distortion is in short burnt position, and maximum distortion is about 8%.
As can be seen from above each figure, overall system architecture and every image quality index all meet performance requirement.

Claims (3)

1. the large zoom ratio zoom lens of compact three constituent element, it is characterized in that, it is followed successively by the compensating group (4) of front fixing group (1) of positive light coke, the zoom group (2) of negative power and positive light coke from left to right, iris (3) is fixed on compensating group (4) front end, mobile with compensating group (4);
Front fixing group (1) comprises cemented doublet (1-1) and simple lens (1-2); Cemented doublet (1-1) is negative, positive structure, and wherein negative lens is meniscus shaped lens, and positive lens is lenticular lens; Simple lens (1-2) is convexo-plane lens;
Zoom group (2) comprises the cemented doublet (2-2) of negative lens (2-1) and negative power; Simple lens (2-1) is double concave; Cemented doublet (2-2) is negative lens and positive lens glued construction;
The focal power that compensating group (4) comprises the first cemented doublet (4-1) and the second cemented doublet (4-2) is that just the 3rd cemented doublet (4-3) focal power is negative; Simple lens (4-4) near image planes adopts the thick falcate of high-index material, for the correction to the curvature of field and astigmatism.
2. the large zoom ratio zoom lens of compact three constituent element according to claim 1, is characterized in that, the condition that each constituent element focal power meets is as follows,
5＜|f A/f B|＜8
1.2＜|f C/f B|＜2
d BC_L/f B＞0
In formula: f afor front fixing group of (1) focal length, f bfor zoom group (2) focal length, f cfor compensating group (4) focal length, d bC_Lfor focal length position end zoom group (2) and compensating group (4) interval.
3. the large zoom ratio zoom lens of compact three constituent element according to claim 1, is characterized in that, the positive and negative lens in the 3rd cemented doublet (4-3) adopt especial dispersion glass H-FK61 and TF3 respectively.
CN201510147959.2A 2015-03-31 2015-03-31 The big zoom ratio zoom lens of the constituent element of compact three Active CN104749755B (en)

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Publication number Priority date Publication date Assignee Title
CN108983419A (en) * 2018-06-27 2018-12-11 湖北华中光电科技有限公司 A kind of optical system based on multispectral imaging
CN109387931A (en) * 2018-11-06 2019-02-26 中国科学院西安光学精密机械研究所 A kind of short-wave infrared continuous magnification lens
CN114063271A (en) * 2021-10-29 2022-02-18 福建福光股份有限公司 Zoom and distance-variable industrial image detection optical system
CN115616748A (en) * 2022-09-21 2023-01-17 福建福光股份有限公司 High-definition large-image-surface manual zoom lens

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CN203930188U (en) * 2014-06-20 2014-11-05 福建福光数码科技有限公司 Compact super large image planes continuous magnification lens

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983419A (en) * 2018-06-27 2018-12-11 湖北华中光电科技有限公司 A kind of optical system based on multispectral imaging
CN109387931A (en) * 2018-11-06 2019-02-26 中国科学院西安光学精密机械研究所 A kind of short-wave infrared continuous magnification lens
CN109387931B (en) * 2018-11-06 2023-12-08 中国科学院西安光学精密机械研究所 Short wave infrared continuous zoom lens
CN114063271A (en) * 2021-10-29 2022-02-18 福建福光股份有限公司 Zoom and distance-variable industrial image detection optical system
CN115616748A (en) * 2022-09-21 2023-01-17 福建福光股份有限公司 High-definition large-image-surface manual zoom lens
CN115616748B (en) * 2022-09-21 2024-04-05 福建福光股份有限公司 Manual zoom lens with high definition and large image plane

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