CN103969814B - A kind of optical focal distance setting system - Google Patents
A kind of optical focal distance setting system Download PDFInfo
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- CN103969814B CN103969814B CN201410165937.4A CN201410165937A CN103969814B CN 103969814 B CN103969814 B CN 103969814B CN 201410165937 A CN201410165937 A CN 201410165937A CN 103969814 B CN103969814 B CN 103969814B
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Abstract
The invention provides a kind of optical focal distance setting system, including: objective lens, the first lens set, the second lens set and eyepiece group；Objective lens, the first lens set, the second lens set, eyepiece group are arranged in order according to order from the object side to the image side；The focal distance f 1 of the first lens set and the focal distance f 2 of the second lens set meet relational expression: 1 < f1/f2 < 1.6.The present invention can realize continuous zoom, has good image quality.
Description
Technical field
The present invention relates to optical instrument field, be specifically related to a kind of optical focal distance setting system.
Background technology
For optical viewing equipment, being its basic function by the image zoom of object, this function can help observer clearly to observe the target in a distant place.The amplification of object image is realized by optical focal distance setting system, each lens set in optical system, and after design with processing, its focal length is exactly changeless, and the focal length of whole system to be changed can only change the distance between each lens set.
Optical focal distance setting system of the prior art, structure is simple and crude, and enlargement ratio regulation has only been regulated by eyepiece, and not only range of accommodation is little, and forms bigger aberration during regulation, has a strong impact on image quality, it is impossible to realize continuous zoom.
Being not difficult to find out, prior art there is also certain defect.
Summary of the invention
The technical problem to be solved is to provide a kind of optical focal distance setting system, it is achieved continuous zoom, has good image quality.
For achieving the above object, the present invention is by the following technical solutions:
A kind of optical focal distance setting system, including: objective lens, the first lens set, the second lens set and eyepiece group；Objective lens, the first lens set, the second lens set, eyepiece group are arranged in order according to order from the object side to the image side；
The focal distance f 1 of the first lens set and the focal distance f 2 of the second lens set meet relational expression: 1 < f1/f2 < 1.6.
Further, described first lens set includes: the first balsaming lens of positive light coke and the second lens of negative power；The thing side of the first lens set is located at by first balsaming lens；The image side of the first lens set is located at by second lens；
The focal distance f 11 of the first balsaming lens and the focal distance f 12 of the second lens meet relational expression: 1 < f11/f12 < 2.
Further, described second lens set includes: the 3rd lens of positive light coke, the 4th lens of negative power and the 5th lens of positive light coke；The thing side of the second lens set is located at by 3rd lens；The image side of the second lens set is located at by 5th lens；4th lens are located between the 3rd lens and the 5th lens.
Further, described objective lens is balsaming lens.
A kind of optical focal distance setting system provided by the present invention, has the advantage that
Zoom ratio is big, can reach 3-7 times；
The aberration that can realize continuous zoom, wide-angle side and telescopic end all controls in the range of preferably, thus this optical focal distance setting system has preferable image quality；
Simple in construction, it is easy to manufacture.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of optical focal distance setting system that Fig. 1 provides for the embodiment of the present invention one.
Fig. 2 is the structural representation of the embodiment of the present invention two.
Fig. 3 is the present invention at the spherical aberration of wide-angle side and chromaticity difference diagram.
Fig. 4 is the present invention at the spherical aberration of telescopic end and chromaticity difference diagram.
Fig. 5 is the present invention curvature of field figure in wide-angle side.
Fig. 6 is the present invention curvature of field figure in telescopic end.
Fig. 7 is the present invention distortion figure in wide-angle side.
Fig. 8 is the present invention distortion figure in telescopic end.
Fig. 9 is that the present invention schemes at the MTF of wide-angle side.
Figure 10 is that the present invention schemes at the MTF of telescopic end.
Description of reference numerals:
1, objective lens the 2, first lens set
3, the second lens set 4, eyepiece group
5, first balsaming lens the 6, second lens
7, the 3rd lens the 8, the 4th lens
9, the 5th lens 10, reflecting mirror group
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention and accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.It should be noted that described embodiment be only the present invention a part of embodiment rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
Referring to Fig. 1, embodiments of the invention provide a kind of optical focal distance setting system, including: objective lens the 1, first lens set the 2, second lens set 3 and eyepiece group 4；Objective lens the 1, first lens set the 2, second lens set 3, eyepiece group 4 are arranged in order according to order from the object side to the image side；The focal distance f 1 and second of the first lens set 2
Lens set
The focal distance f 2 of 3 meets relational expression: 1 < f1/f2 < 1.6.
Native system can be applied on the facilities for observations such as such as Target observator.Optical focal distance setting system is during work, and the light from object can form an image after objective lens 1, then is amplified by image through the first lens set 2 and the second lens set 3 zoom, is then passed through eyepiece group 4 and enters the image after human eyeball forms amplification.This optical focal distance setting system whole by low power to the zoom of high power during, the first lens set 2 first moves along the direction of optical axis direction thing side, and the direction along optical axis direction image side is moved the most again；The second lens set 3 then fixing direction along optical axis direction thing side is moved；Objective lens 1 and eyepiece group 4 are fixed during whole zoom.
Learn after deliberation, as long as the focal distance f 1 and f2 of the first lens set 2 of optical focal distance setting system and the second lens set 3 meets 1 < f1/f2 < 1.6, can reasonable distribution the first lens set 2 and the focal length of the second lens set 3 when specific design.If f1/f2 < 1, then show that the focal length of the first lens set 2 is too short, cause the curvature of field aberration of optical focal distance setting system effectively not correct；If f1/f2 > 1.6, then showing that the focal length of the second lens set 3 is too short, each lens face curvature of the second lens set 3 is too small, and the overall aberration that each face produces is excessive, causes optical focal distance setting system can not effectively control spherical aberration and coma.
First lens set 2 is for compensating image.Further, described first lens set 2 includes: the first balsaming lens 5 of positive light coke and the second lens 6 of negative power；The thing side of the first lens set 2 is located at by first balsaming lens 5；The image side of the first lens set 2 is located at by second lens 6；The focal distance f 11 of the first balsaming lens 5 and the focal distance f 12 of the second lens 6 meet relational expression: 1 < f11/f12 < 2.
As long as the focal distance f 11 and f12 of the first balsaming lens 5 of the first lens set 2 and the second lens 6 meets above formula, can reasonable distribution the first balsaming lens 5 and the focal length of the second lens 6 when specific design.If f11/f12 < 1, then the focal length of the first balsaming lens 5 is too short, causes the aberration of optical focal distance setting system effectively not control；If f11/f12 > 2, then the distortion of optical focal distance setting system can not effectively control.
Second lens set 3, for image-zooming, makes image be amplified to be suitable for the multiplying power that observer observes.Further, described second lens set 3 includes: the 3rd lens 7 of positive light coke, the 4th lens 8 of negative power and the 5th lens 9 of positive light coke；The thing side of the second lens set 3 is located at by 3rd lens 7；The image side of the second lens set 3 is located at by 5th lens 9；4th lens 8 are located between the 3rd lens 7 and the 5th lens 9.
As preferably, in the present embodiment, described objective lens 1 is balsaming lens, and the objective lens 1 being made up of balsaming lens has the effect eliminating aberration.It should be noted that eyepiece group 4 can be set to the lens set that simple lens, balsaming lens or structure is complex.But no matter which kind of structure is eyepiece group 4 be, without departing from the inventive concept of the premise, broadly falls into protection scope of the present invention.
Embodiment two
Refer to Fig. 2, in actual application, reflecting mirror group 10 can be added in optical focal distance setting system of the present invention to change the direction of light path conduction.
As preferably, use the lens technology parameter of the one group of present invention preferable embodiment that the present invention is illustrated below:
Face sequence number in table represents every piece of lens, or the balsaming lens being combined into by lens glue；Radius of curvature represents the radius of curvature of the minute surface of every piece of lens；Refractive index and Abbe number represent the parameter of every piece of lens self accordingly.
By the technical parameter in table is calculated, the first lens set 2 and movement locus of the second lens set 3 of correspondence can be calculated.In order to make calculating efficient and convenient and result is accurate, as preferably, pass through Computer Simulation in the present embodiment.
Fig. 3 to Figure 10 is the optical aberration figure of the embodiment of the present invention, can be reflected the image quality of the present invention by optical aberration figure.Make a concrete analysis of below in conjunction with each figure:
Fig. 3 and Fig. 4 is spherical aberration aberration and the aberration aberration diagram of wide-angle side of the present invention and telescopic end respectively, and dotted line represents D wavelength light, and solid line represents F and C wavelength light respectively.Spherical aberration that Fig. 3 and Fig. 4 reflects and Difference Control are in aberration evaluates the margin of tolerance.
Fig. 5 and Fig. 6 is the curvature of field aberration diagram of wide-angle side of the present invention and telescopic end respectively, and dotted line therein represents the sagitta of arc (S) face, and solid line represents meridian (T) face, and three pairs of S and T lines represent 0,0.707 and 1 visual field respectively.The curvature of field that Fig. 5 and Fig. 6 reflects controls in aberration evaluates the margin of tolerance.
Fig. 7 and Fig. 8 is the distortion aberration diagram of wide-angle side and telescopic end respectively, represents the distortion of 0,0.707 and 1 visual field respectively.The aberration control that Fig. 7 and Fig. 8 reflects is in aberration range of value.
Fig. 9 and Figure 10 is the MTF aberration diagram of wide-angle side and telescopic end respectively, wherein dotted line represents the sagitta of arc (S) face, chain-dotted line represents meridian (T) face, three pairs of S and T lines represent 0,0.707 and 1 visual field respectively, and the curvature of field that Fig. 9 and Figure 10 reflects controls in aberration evaluates the margin of tolerance.
Optical focal distance setting system of the present invention, reasonable coordination by each lens set focal length, and first the cooperation of lens set 2 and the second lens set 3 move, realize the continuous zoom function of big zoom ratio, and aberration controls all the time in proper range during zoom, ensure image quality, there is the optical zoom effect of brilliance.And this optical focal distance setting system simple in construction, manufacturing cost is low, is conducive to reality application and industrialization.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (3)
1. an optical focal distance setting system, it is characterised in that including: objective lens, the first eyeglass
Group, the second lens set and eyepiece group；Objective lens, the first lens set, the second lens set, eyepiece
Group is arranged in order according to order from the object side to the image side；
The focal distance f 1 of the first lens set and the focal distance f 2 of the second lens set meet relational expression:
1<f1/f2<1.6；
Described first lens set includes: the first balsaming lens of positive light coke and the of negative power
Two lens；The thing side of the first lens set is located at by first balsaming lens；The first mirror is located at by second lens
The image side of sheet group；
The focal distance f 11 of the first balsaming lens and the focal distance f 12 of the second lens meet relational expression:
1<f11/f12<2。
Optical focal distance setting system the most according to claim 1, it is characterised in that described
Two lens set include: the 3rd lens of positive light coke, the 4th lens of negative power and positive light are burnt
5th lens of degree；The thing side of the second lens set is located at by 3rd lens；5th lens are located at second
The image side of lens set；4th lens are located between the 3rd lens and the 5th lens.
Optical focal distance setting system the most according to claim 1, it is characterised in that: described thing
Mirror group is balsaming lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410165937.4A CN103969814B (en) | 2014-04-23 | 2014-04-23 | A kind of optical focal distance setting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410165937.4A CN103969814B (en) | 2014-04-23 | 2014-04-23 | A kind of optical focal distance setting system |
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| CN103969814A CN103969814A (en) | 2014-08-06 |
| CN103969814B true CN103969814B (en) | 2016-08-24 |
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| CN201410165937.4A Active CN103969814B (en) | 2014-04-23 | 2014-04-23 | A kind of optical focal distance setting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114690386B (en) | 2020-12-30 | 2023-10-24 | 信泰光学(深圳)有限公司 | Optical zoom system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721638A (en) * | 1995-12-11 | 1998-02-24 | Samsung Aerospace Industries, Ltd. | Wide-angle variable magnification viewfinder |
| CN2653534Y (en) * | 2003-08-27 | 2004-11-03 | 金成� | Zoom camera lens |
| CN101943546A (en) * | 2010-08-17 | 2011-01-12 | 福州开发区鸿发光电子技术有限公司 | Sighting telescope for low-light night vision gun |
| CN203882003U (en) * | 2014-04-23 | 2014-10-15 | 广州博冠光电科技股份有限公司 | Optical zooming system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0133445B1 (en) * | 1993-09-17 | 1998-04-23 | 구자홍 | Zoom lens of rear focus type having unification with optic |
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2014
- 2014-04-23 CN CN201410165937.4A patent/CN103969814B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721638A (en) * | 1995-12-11 | 1998-02-24 | Samsung Aerospace Industries, Ltd. | Wide-angle variable magnification viewfinder |
| CN2653534Y (en) * | 2003-08-27 | 2004-11-03 | 金成� | Zoom camera lens |
| CN101943546A (en) * | 2010-08-17 | 2011-01-12 | 福州开发区鸿发光电子技术有限公司 | Sighting telescope for low-light night vision gun |
| CN203882003U (en) * | 2014-04-23 | 2014-10-15 | 广州博冠光电科技股份有限公司 | Optical zooming system |
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