CN113484999B - Zoom lens for focusing - Google Patents
Zoom lens for focusing Download PDFInfo
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- CN113484999B CN113484999B CN202110747307.8A CN202110747307A CN113484999B CN 113484999 B CN113484999 B CN 113484999B CN 202110747307 A CN202110747307 A CN 202110747307A CN 113484999 B CN113484999 B CN 113484999B
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- lens
- spherical surface
- focusing
- zoom lens
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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
- G02B15/142—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 having two groups only
- G02B15/1425—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 having two groups only the first group being negative
Abstract
The invention discloses a zoom lens for focusing, which consists of a first lens and a second lens in sequence from an object space, wherein the first lens is a biconcave spherical negative lens and comprises a concave first spherical surface and a concave second spherical surface, the second lens is a biconvex spherical positive lens and comprises a convex third spherical surface and a convex fourth spherical surface, and the first lens and the second lens are made of glass materials. The zoom lens can be used for focusing of a lens with fixed magnification in some optical designs, so that the zoom lens can be focused under other magnifications, has better optical performance, can greatly expand the application range of some lenses with fixed magnification, and can also be focused in some non-axisymmetric optical systems.
Description
Technical Field
The invention provides a zoom lens for focusing, and particularly relates to a zoom lens with an equivalent focal length f being 990-infinity millimeters.
Background
In the field of machine vision and other industrial optical imaging, a plurality of lenses designed by adopting fixed magnification are provided, the performance of the lenses is very excellent under the design magnification, but the performance is sharply reduced under other magnifications, and in practical work, the situation of changing the system magnification is occasionally encountered, and at the moment, a focusing scheme can be adopted to avoid reducing too much performance of the system, however, in some non-axisymmetric optical systems, focusing is particularly difficult in a larger optical magnification range.
Therefore, it is an urgent need to provide a zoom lens for focusing suitable for a fixed magnification lens and some non-axisymmetric optical systems.
Disclosure of Invention
In view of the above, the present invention provides a zoom lens for focusing to solve the problem of focusing of a fixed-magnification lens and some non-axisymmetric optical systems.
The technical scheme provided by the invention is as follows: the zoom lens for focusing comprises a first lens and a second lens in sequence from an object space, wherein the first lens is a double-concave spherical negative lens and comprises a concave first spherical surface and a concave second spherical surface, the second lens is a double-convex spherical positive lens and comprises a convex third spherical surface and a convex fourth spherical surface, and the first lens and the second lens are made of glass materials.
Preferably, the refractive index of the first lens is more than 1.55 and less than 1.7, and the dispersion is more than 45 and less than 65; the refractive index of the second lens is more than 1.55 and less than 1.7, and the dispersion is more than 50 and less than 70.
Further preferably, the material of the first lens is H-ZK11 CDGM, the refractive index is 1.6385, and the dispersion is 55.5; the material of the second lens is H-ZK9B CDGM, the refractive index is 1.62, and the dispersion is 60.4.
More preferably, the parameters of the zoom lens for focusing are as follows:
the curvature radius of the first spherical surface is 388.085 mm, the clear aperture is 72 mm, and the K value is 0;
the curvature radius of the second spherical surface is 97.67 mm, the distance from the second spherical surface to the first spherical surface is 3mm, the clear aperture is 70 mm, and the K value is 0;
the curvature radius of the third spherical surface is 100.3 mm, the distance from the third spherical surface to the second spherical surface is 0.1-16 mm, the clear aperture is 65 mm, and the K value is 0;
the radius of curvature of the fourth spherical surface is 326.1 mm, the distance from the fourth spherical surface to the third spherical surface is 10 mm, the aperture of the light transmission is 65 mm, and the K value is 0.
More preferably, the first lens is a negative lens, and satisfies the following conditional expression:
1<f1/d1<2
wherein f1 is the absolute value of the focal length of the first lens, and d1 is the clear aperture of the first lens;
the second lens is a positive lens and satisfies the following conditional expression:
0.9<f2/d2<2.5
wherein f2 is the absolute value of the focal length of the second lens, and d2 is the clear aperture of the second lens.
The zoom lens for focusing provided by the invention has a simple structure and a small volume, can be used as an additional lens and is attached to a lens which cannot be focused by a common fixed magnification, so that the zoom lens can achieve the effect of focusing within a certain range, and the application of the common fixed magnification lens is greatly expanded; the zoom lens for focusing provided by the invention adopts a low-cost glass compact design, the structure of the lens is simplified, all lenses of the lens are made of glass materials, the performance parameters of a single lens are improved, the yield of the whole lens is improved, and the actual production is facilitated.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
fig. 1 is a schematic structural diagram of a zoom lens for focusing according to the present invention;
FIG. 2 is an MTF chart of the zoom lens for focusing according to the present invention;
FIG. 3 is an astigmatic field curvature diagram of the zoom lens for focusing according to the present invention;
FIG. 4 is an optical distortion diagram of the zoom lens for focusing according to the present invention;
fig. 5 is a relative illuminance diagram of the zoom lens for focusing according to the present invention.
Detailed Description
The invention will be further explained with reference to specific embodiments, without limiting the invention.
As shown in fig. 1, the present invention provides a zoom lens for focusing, which is composed of a first lens 1 and a second lens 2 in sequence from an object side, wherein the first lens 1 is a negative lens with a biconcave spherical surface and includes a first spherical surface with a concave surface and a second spherical surface with a concave surface, the second lens 2 is a positive lens with a biconvex spherical surface and includes a third spherical surface with a convex surface and a fourth spherical surface with a convex surface, and both the first lens 1 and the second lens 2 are made of glass materials.
The focal length f of the zoom lens for focusing is 980-infinity mm, and the total lens length is 30 mm.
The zoom lens for focusing has a simple structure and a small volume, can be used as an additional lens and an additional lens, and is attached to a lens which cannot be focused by a common fixed magnification, so that the zoom lens can achieve the effect of focusing within a certain range, and the application of the common fixed magnification lens is greatly expanded; the zoom lens for focusing provided by the invention adopts a low-cost glass compact design, the structure of the lens is simplified, all lenses of the lens are made of glass materials, the performance parameters of a single lens are improved, the yield of the whole lens is improved, and the actual production is facilitated.
As an improvement of the technical scheme, the refractive index of the first lens is more than 1.55 and less than 1.7, and the dispersion is more than 45 and less than 65; the refractive index of the second lens is more than 1.55 and less than 1.7, and the dispersion is more than 50 and less than 70.
As a technical improvement, the material of the first lens is H-ZK11 CDGM, the refractive index is 1.6385, and the dispersion is 55.5; the material of the second lens is H-ZK9B CDGM, the refractive index is 1.62, and the dispersion is 60.4.
As an improvement of the technical solution, the parameters of the zoom lens for focusing are as follows:
the curvature radius of the first spherical surface is 388.085 mm, the clear aperture is 72 mm, and the K value is 0;
the curvature radius of the second spherical surface is 97.67 mm, the distance from the second spherical surface to the first spherical surface is 3mm, the clear aperture is 70 mm, and the K value is 0;
the curvature radius of the third spherical surface is 100.3 mm, the distance from the third spherical surface to the second spherical surface is 0.1-16 mm, the clear aperture is 65 mm, and the K value is 0;
the radius of curvature of the fourth spherical surface is 326.1 mm, the distance from the fourth spherical surface to the third spherical surface is 10 mm, the aperture of the light transmission is 65 mm, and the K value is 0.
The details are shown in the following table:
as an improvement of the technical solution, the first lens is a negative lens, and the following conditional expression is satisfied:
1<f1/d1<2
wherein f1 is the absolute value of the focal length of the first lens, and d1 is the clear aperture of the first lens;
the second lens is a positive lens and satisfies the following conditional expression:
0.9<f2/d2<2.5
wherein f2 is the absolute value of the focal length of the second lens, and d2 is the clear aperture of the second lens.
Fig. 1 is a schematic structural diagram of a zoom lens for focusing according to the present invention.
Fig. 2 is an MTF graph of the zoom lens for focusing according to the present invention, as shown in fig. 2, half of a diagonal line of a CMOS effective area is defined as a maximum image height, which is set as a 1.0 field of view, and 10 fields of view are taken for measuring spatial frequencies of different image heights. The CMOS diagonal half is 14mm, i.e. 1.0 field of view.
As shown in fig. 3 to 5, the astigmatism of the adaptive lens provided by the present invention is less than 0.25 mm. The meridian field curvature and the arc loss field curvature are more than-0.25 mm and less than 0.3 mm. The optical distortion value is less than 5%. The edge illumination is greater than 80%. The optical performance is excellent.
The embodiments of the present invention have been written in a progressive manner with emphasis placed on the differences between the various embodiments, and similar elements may be found in relation to each other.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (4)
1. A zoom lens for focusing, characterized in that: the optical lens comprises a first lens (1) and a second lens (2) in sequence from an object space, wherein the first lens (1) is a biconcave spherical negative lens and comprises a concave first spherical surface and a concave second spherical surface, the second lens (2) is a biconvex spherical positive lens and comprises a convex third spherical surface and a convex fourth spherical surface, and the first lens (1) and the second lens (2) are made of glass materials; the first lens is a negative lens and satisfies the following conditional expression:
1<f1/d1<2
wherein f1 is the absolute value of the focal length of the first lens, and d1 is the clear aperture of the first lens;
the second lens is a positive lens and satisfies the following conditional expression:
0.9<f2/d2<2.5
wherein f2 is the absolute value of the focal length of the second lens, and d2 is the clear aperture of the second lens.
2. The zoom lens for focusing according to claim 1, wherein: the refractive index of the first lens is more than 1.55 and less than 1.7, and the dispersion is more than 45 and less than 65; the refractive index of the second lens is more than 1.55 and less than 1.7, and the dispersion is more than 50 and less than 70.
3. The zoom lens for focusing according to claim 1, wherein: the material of the first lens is H-ZK11 CDGM, the refractive index is 1.6385, and the dispersion is 55.5; the material of the second lens is H-ZK9B CDGM, the refractive index is 1.62, and the dispersion is 60.4.
4. The zoom lens for focusing according to claim 1, wherein: the parameters of the zoom lens for focusing are as follows:
the curvature radius of the first spherical surface is 388.085 mm, the clear aperture is 72 mm, and the K value is 0;
the curvature radius of the second spherical surface is 97.67 mm, the distance from the second spherical surface to the first spherical surface is 3mm, the clear aperture is 70 mm, and the K value is 0;
the curvature radius of the third spherical surface is 100.3 mm, the distance from the third spherical surface to the second spherical surface is 0.1-16 mm, the clear aperture is 65 mm, and the K value is 0;
the radius of curvature of the fourth spherical surface is 326.1 mm, the distance from the fourth spherical surface to the third spherical surface is 10 mm, the aperture of the light transmission is 65 mm, and the K value is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110747307.8A CN113484999B (en) | 2021-07-02 | 2021-07-02 | Zoom lens for focusing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110747307.8A CN113484999B (en) | 2021-07-02 | 2021-07-02 | Zoom lens for focusing |
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| Publication Number | Publication Date |
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| CN113484999A CN113484999A (en) | 2021-10-08 |
| CN113484999B true CN113484999B (en) | 2022-04-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011013578A (en) * | 2009-07-03 | 2011-01-20 | Sony Corp | Zoom lens, camera module and electronic equipment |
| TW201217828A (en) * | 2010-10-28 | 2012-05-01 | Hon Hai Prec Ind Co Ltd | Wide-angle adapter lens and optical system using same |
| WO2013141284A1 (en) * | 2012-03-21 | 2013-09-26 | 株式会社タムロン | Infrared-ray optical system |
| CN104062737A (en) * | 2014-07-18 | 2014-09-24 | 上海斐讯数据通信技术有限公司 | Wide-angle lens of mobile terminal camera |
| CN106773025A (en) * | 2015-11-24 | 2017-05-31 | 深圳先进技术研究院 | Focusing lens and lens vibrating type laser scanning system |
| CN110596867A (en) * | 2019-10-18 | 2019-12-20 | 沈阳师范大学 | Adaptive lens for ultra-wide-angle lens of mobile phone |
-
2021
- 2021-07-02 CN CN202110747307.8A patent/CN113484999B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011013578A (en) * | 2009-07-03 | 2011-01-20 | Sony Corp | Zoom lens, camera module and electronic equipment |
| TW201217828A (en) * | 2010-10-28 | 2012-05-01 | Hon Hai Prec Ind Co Ltd | Wide-angle adapter lens and optical system using same |
| WO2013141284A1 (en) * | 2012-03-21 | 2013-09-26 | 株式会社タムロン | Infrared-ray optical system |
| CN104062737A (en) * | 2014-07-18 | 2014-09-24 | 上海斐讯数据通信技术有限公司 | Wide-angle lens of mobile terminal camera |
| CN106773025A (en) * | 2015-11-24 | 2017-05-31 | 深圳先进技术研究院 | Focusing lens and lens vibrating type laser scanning system |
| CN110596867A (en) * | 2019-10-18 | 2019-12-20 | 沈阳师范大学 | Adaptive lens for ultra-wide-angle lens of mobile phone |
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| Publication number | Publication date |
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| CN113484999A (en) | 2021-10-08 |
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