CN107479176B - Five-gear zoom lens for focal length instrument - Google Patents
Five-gear zoom lens for focal length instrument Download PDFInfo
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- CN107479176B CN107479176B CN201710741356.4A CN201710741356A CN107479176B CN 107479176 B CN107479176 B CN 107479176B CN 201710741356 A CN201710741356 A CN 201710741356A CN 107479176 B CN107479176 B CN 107479176B
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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
- G02B15/177—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 negative front lens or group of lenses
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Abstract
The invention discloses a five-gear zoom lens for a focal length instrument. This camera lens realizes the switching between each gear through zooming and variable object distance, reaches the effect of zooming, including the first portion, the second part, the third part that set up in order, wherein: the first part comprises a first double cemented lens, the first part is a variable power group, provides optical power and realizes the switching between gears through movement to achieve the function of variable power; the second part comprises a first biconvex lens and a second biconvex lens which are sequentially arranged, and the second part is a compensation group and is used for compensating and correcting aberration after gear switching; the third part comprises a third double-cemented lens, a fourth double-cemented lens and a first meniscus lens, and the third part is a fixed group and is used for correcting spherical aberration and chromatic aberration. The measuring lens of the invention has wide detection range and few lenses, and accords with the trend of automatic measurement of a future focal length instrument.
Description
Technical Field
The invention relates to the technical field of optical measurement, in particular to a five-gear zoom lens for a focal length instrument.
Background
The focal length is an important parameter of the optical lens and the optical system, and is one of the most fundamental parameters in the process of assembling and adjusting the optical system. The focal length instrument is an instrument for measuring the focal length of an optical lens or an optical system, and is widely applied to the production and processing industries of optical lenses.
The focal length meter usually needs to be equipped with a group of measuring lenses with different magnifications and different working distances, the magnification and the working distance of each measuring lens are fixed, and the measuring lenses with different magnifications need to be replaced when measuring the measured lenses with different focal lengths, so that the procedure is complicated, and the working efficiency is influenced. And a plurality of measuring lenses are provided, so that more glass materials are required to be used.
Disclosure of Invention
The invention aims to provide a five-gear zoom measuring lens for a focal length meter so as to realize the large-range measurement of focal length.
The technical solution for realizing the purpose of the invention is as follows: a five-gear zoom lens for a focal length instrument, which realizes zoom by changing zoom and object distance simultaneously and realizes switching between gears so as to realize zoom, specifically comprises a first part G1, a second part G2 and a third part G3 which are arranged in sequence;
the first part G1 is a zoom group and is used for switching the gears of the five-gear zoom lens for the focal length instrument; the second part G2 is a compensation group and is used for compensating the image plane movement of the five-gear zoom lens for the focal length instrument in gear switching and correcting aberration; the third portion G3 is a fixed group;
when the magnification of the five-gear zoom lens for the focal length instrument is adjusted from large to large, the first part G1 is moved towards the third part G3; at the same time, the second section G2, which is a compensation group, is also moved toward the third section G3 to compensate for the aberration variation caused by the movement of the first section G1 and the image plane movement.
Further, the fifth gear is respectively:
a first gear: 8 times of magnification and 20mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 118.5mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 106 mm;
a second gear: 2.5 times magnification and 50mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 47.6mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 34.8 mm;
third gear: 1 time magnification and 100mm object distance; the distance between the exit surface of the first portion G1 and the entrance surface of the third portion G3 was 27mm, and the distance between the exit surface of the second portion G2 and the entrance surface of the third portion G3 was 13.5 mm;
fourth gear: 0.5 times magnification and 300mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 21.0mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 8.0 mm;
fifth gear: 0.16 times magnification and 1000mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 15.9mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 3.7 mm.
Further, the first portion G1 is composed of a first cemented doublet L1 having a negative refractive power, which are sequentially disposed.
Further, the second section G2 was composed of a first biconvex positive lens L2 and a second biconvex positive lens L3, which were arranged in this order, with an air space of 0.5mm therebetween.
Further, the third section G3 is composed of a third double cemented negative lens L4, a fourth double cemented negative lens L5, and a first meniscus positive lens L6, which are sequentially arranged, and the air interval between the third double cemented negative lens L4 and the fourth double cemented negative lens L5 is 70.0mm, and the air interval between the fourth double cemented negative lens L5 and the first meniscus positive lens L6 is 10.2 mm.
Compared with the prior art, the invention has the following remarkable advantages: (1) the function of the original group of measuring lenses with fixed magnification and fixed working distance can be realized by using the five-gear zoom lens; (2) when the focal length instrument measures focal lengths in different ranges, the measuring lens does not need to be replaced; (3) the working efficiency of the focal length instrument is improved, the total number of lens sheets is reduced, the motor is convenient to drive, and the stability of the system is improved.
Drawings
Fig. 1 is a schematic structural diagram of three parts of a five-gear zoom lens for a focal length meter according to the present invention.
Fig. 2 is a schematic diagram of structural data annotation of a five-gear zoom lens for a focal length meter according to the present invention.
Fig. 3 is a schematic view of a first-gear structure of a five-gear zoom lens for a focal length meter according to the present invention.
Fig. 4 is a schematic diagram of a second gear structure of a five-gear zoom lens for a focal length meter according to the present invention.
Fig. 5 is a third-gear structural schematic diagram of a fifth-gear zoom lens for a focal length meter according to the present invention.
Fig. 6 is a fourth-gear structural schematic diagram of a fifth-gear zoom lens for a focal length meter according to the present invention.
Fig. 7 is a fifth-gear structural schematic diagram of a fifth-gear zoom lens for a focal length meter according to the present invention.
Fig. 8 is a schematic diagram of a position relationship between a first part and a second part of a five-gear zoom lens for a focal length meter during gear shifting according to the present invention.
Fig. 9 is a diagram of evaluating the comprehensive image quality of the five-stage zoom lens for a focal length meter according to the present invention, in which (a) to (e) are graphs of optical transfer functions at first to fifth stages, respectively, and (f) is a schematic diagram of curvature of field and distortion.
Detailed Description
With reference to fig. 1-2, the five-shift zoom lens for a focal length meter of the present invention, which changes the object distance and the zoom simultaneously to realize the switching between the shift positions and thus realize the zoom, specifically includes a first portion G1, a second portion G2, and a third portion G3 sequentially disposed;
the first part G1 is a zoom group and is used for switching the gears of the five-gear zoom lens for the focal length instrument; the second part G2 is a compensation group and is used for compensating the image plane movement of the five-gear zoom lens for the focal length instrument in gear switching and correcting aberration; the third portion G3 is a fixed group;
when the magnification of the five-gear zoom lens for the focal length instrument is adjusted from large to large, the first part G1 is moved towards the third part G3; at the same time, the second section G2, which is a compensation group, is also moved toward the third section G3 to compensate for the aberration variation caused by the movement of the first section G1 and the image plane movement.
Further, the fifth gear is respectively:
a first gear: 8 times of magnification and 20mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 118.5mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 106 mm;
a second gear: 2.5 times magnification and 50mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 47.6mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 34.8 mm;
third gear: 1 time magnification and 100mm object distance; the distance between the exit surface of the first portion G1 and the entrance surface of the third portion G3 was 27mm, and the distance between the exit surface of the second portion G2 and the entrance surface of the third portion G3 was 13.5 mm;
fourth gear: 0.5 times magnification and 300mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 21.0mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 8.0 mm;
fifth gear: 0.16 times magnification and 1000mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 15.9mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 3.7 mm.
Further, the first portion G1 is composed of a first cemented doublet L1 having a negative refractive power, which are sequentially disposed.
Further, the second section G2 was composed of a first biconvex positive lens L2 and a second biconvex positive lens L3, which were arranged in this order, with an air space of 0.5mm therebetween.
Further, the third section G3 is composed of a third double cemented negative lens L4, a fourth double cemented negative lens L5, and a first meniscus positive lens L6, which are sequentially arranged, and the air interval between the third double cemented negative lens L4 and the fourth double cemented negative lens L5 is 70.0mm, and the air interval between the fourth double cemented negative lens L5 and the first meniscus positive lens L6 is 10.2 mm.
Example 1
Fig. 1 is a schematic structural diagram of three parts of a five-gear zoom lens for a focal length meter according to the present invention. Fig. 2 is a schematic diagram of structural data annotation of a five-gear zoom lens for a focal length meter according to the present invention. As shown in fig. 1: a first portion G1 having a negative refractive power, a second portion G2 having a positive refractive power, and a third portion G3 having a negative refractive power, which are disposed at a time from the object space L0 to the image space L7.
The first part G1 is a zoom group and is used for changing the focal length of a five-gear zoom lens and switching the gear of the lens; the first section G1 is composed of a first cemented negative lens L1. The second section G2 is a compensation group, and is composed of one biconvex positive lens L2 and a second cemented positive lens L3, and functions to compensate for the shift of the image plane position after the shift position is switched and to correct aberrations in the five-stage zoom lens for a focal length meter. The first portion G1 and the second portion G2 move before the third portion G3.
Specifically, when the magnification of the five-stage zoom lens for a focal length finder is adjusted from large to large, the first section G1 is moved toward the third section G3, and the second section G2 as a compensation group is also moved toward the third section G3, which compensates for the aberration change and the image plane movement caused by the movement of the first section G1.
The third portion G3 is a fixed group, and is composed of a third double cemented negative lens L4, a fourth double cemented negative lens L5, and a first meniscus positive lens L6. The effect is to image the subject of the object side to the image plane position L7.
FIGS. 3 to 7 are schematic diagrams of positions of each gear of a five-gear zoom lens,
FIG. 3 shows first gear: 8 times of magnification and 20mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 118.5mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 106 mm;
fig. 4 is second gear: 2.5 times magnification and 50mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 47.6mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 34.8 mm;
fig. 5 is third gear: 1 time magnification and 100mm object distance; the distance between the exit surface of the first portion G1 and the entrance surface of the third portion G3 was 27mm, and the distance between the exit surface of the second portion G2 and the entrance surface of the third portion G3 was 13.5 mm;
fig. 6 is fourth gear: 0.5 times magnification and 300mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 21.0mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 8.0 mm;
fig. 7 is fifth gear: 0.16 times magnification and 1000mm object distance; the distance between the exit face of the first portion G1 and the entrance face of the third portion G3 was 15.9mm, and the distance between the exit face of the second portion G2 and the entrance face of the third portion G3 was 3.7 mm.
The five-gear shift process of the lens is depicted by the two curves in fig. 8. The positional relationship of the first portion G1 and the second portion G2 at five gear positions of the lens is depicted. During the five-gear zooming of the lens, the first part G1 and the second part G2 are always at a certain distance during movement. In the whole zooming process, the minimum air thickness of the last surface of the first part G1 and the first surface of the first part G1 in the five-gear zooming lens is 0.7mm, and the two groups of lenses cannot touch each other. In addition, the moving distance of the whole moving group is close to 100mm, so that the traditional zooming cam structure is abandoned, and a linear guide rail is used for moving. If the linear guide rail is controlled by a motor at the later stage, automatic gear shifting can be realized.
The five-gear zoom lens for the focal length instrument has good imaging quality, and optical transfer functions (MTF) on five gears reach more than 30 line pairs and are close to the diffraction limit by combining with the images in the (a) to (f) of fig. 9, and the distortion and the field curvature of the five gears meet the requirements. The lens can replace the existing group of measuring lenses with different magnifications and different working distances, and has good application requirements.
Claims (4)
1. A five-gear zoom lens for a focal length instrument is characterized in that the lens realizes zoom by changing zoom and object distance simultaneously and realizing switching between gears, and specifically comprises a first part (G1), a second part (G2) and a third part (G3) which are sequentially arranged;
wherein, the first part (G1) is a zoom group used for switching the gear of the five-gear zoom lens for the focal length instrument; the second part (G2) is a compensation group for compensating the image plane movement of the five-gear zoom lens for the focal length instrument in gear switching and correcting aberration; the third part (G3) is a fixed group;
when the magnification of the five-gear zoom lens for the focal length instrument is adjusted from large, the first part (G1) is moved towards the third part (G3); at the same time, the second portion (G2) as a compensation group is also moved toward the third portion (G3) to compensate for the aberration variation caused by the movement of the first portion (G1) and the image plane movement;
the five gears are respectively as follows:
a first gear: 8 times of magnification and 20mm object distance; the distance between the exit face of the first portion (G1) and the entrance face of the third portion (G3) is 118.5mm, and the distance between the exit face of the second portion (G2) and the entrance face of the third portion (G3) is 106 mm;
a second gear: 2.5 times magnification and 50mm object distance; the distance between the exit face of the first portion (G1) and the entrance face of the third portion (G3) was 47.6mm, and the distance between the exit face of the second portion (G2) and the entrance face of the third portion (G3) was 34.8 mm;
third gear: 1 time magnification and 100mm object distance; the distance between the exit face of the first portion (G1) and the entrance face of the third portion (G3) is 27mm, and the distance between the exit face of the second portion (G2) and the entrance face of the third portion (G3) is 13.5 mm;
fourth gear: 0.5 times magnification and 300mm object distance; the distance between the exit face of the first portion (G1) and the entrance face of the third portion (G3) is 21.0mm, and the distance between the exit face of the second portion (G2) and the entrance face of the third portion (G3) is 8.0 mm;
fifth gear: 0.16 times magnification and 1000mm object distance; the distance between the exit face of the first portion (G1) and the entrance face of the third portion (G3) was 15.9mm, and the distance between the exit face of the second portion (G2) and the entrance face of the third portion (G3) was 3.7 mm.
2. The five-stage zoom lens for a focal length meter according to claim 1, wherein the first portion (G1) is composed of a first cemented doublet (L1) having a negative refractive power, which is sequentially disposed.
3. The five-stage zoom lens for a focal length meter according to claim 1, wherein the second portion (G2) is composed of a first biconvex positive lens (L2) and a second biconstituent positive lens (L3) arranged in sequence with an air space of 0.5mm therebetween.
4. The quinary zoom lens for a focal length meter according to claim 1, wherein the third section (G3) is composed of a third double cemented negative lens (L4), a fourth double cemented negative lens (L5), and a first meniscus positive lens (L6) which are sequentially arranged, an air interval between the third double cemented negative lens (L4), the fourth double cemented negative lens (L5) is 70.0mm, and an air interval between the fourth double cemented negative lens (L5) and the first meniscus positive lens (L6) is 10.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710741356.4A CN107479176B (en) | 2017-08-25 | 2017-08-25 | Five-gear zoom lens for focal length instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710741356.4A CN107479176B (en) | 2017-08-25 | 2017-08-25 | Five-gear zoom lens for focal length instrument |
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| Publication Number | Publication Date |
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| CN107479176A CN107479176A (en) | 2017-12-15 |
| CN107479176B true CN107479176B (en) | 2020-01-24 |
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| CN201710741356.4A Expired - Fee Related CN107479176B (en) | 2017-08-25 | 2017-08-25 | Five-gear zoom lens for focal length instrument |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2452036Y (en) * | 2000-12-08 | 2001-10-03 | 中国科学院长春光学精密机械与物理研究所 | Zoom lens of optical compensation |
| CN1673796A (en) * | 2004-03-23 | 2005-09-28 | 富士能株式会社 | A zoom lens including adjoining lens |
| JP2011257625A (en) * | 2010-06-10 | 2011-12-22 | Nitto Kogaku Kk | Lens system |
| CN203259708U (en) * | 2012-12-28 | 2013-10-30 | 利达光电股份有限公司 | Large zoom ratio continuous zooming projection lens |
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006119193A (en) * | 2004-10-19 | 2006-05-11 | Canon Inc | Zoom lens and imaging apparatus equipped with the same |
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2017
- 2017-08-25 CN CN201710741356.4A patent/CN107479176B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2452036Y (en) * | 2000-12-08 | 2001-10-03 | 中国科学院长春光学精密机械与物理研究所 | Zoom lens of optical compensation |
| CN1673796A (en) * | 2004-03-23 | 2005-09-28 | 富士能株式会社 | A zoom lens including adjoining lens |
| JP2011257625A (en) * | 2010-06-10 | 2011-12-22 | Nitto Kogaku Kk | Lens system |
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
| CN203259708U (en) * | 2012-12-28 | 2013-10-30 | 利达光电股份有限公司 | Large zoom ratio continuous zooming projection lens |
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