CN113514941B - Long-focus visible light continuous zoom lens - Google Patents

Long-focus visible light continuous zoom lens Download PDF

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Publication number
CN113514941B
CN113514941B CN202110303117.7A CN202110303117A CN113514941B CN 113514941 B CN113514941 B CN 113514941B CN 202110303117 A CN202110303117 A CN 202110303117A CN 113514941 B CN113514941 B CN 113514941B
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lens
positive
group
negative
meniscus lens
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CN113514941A (en
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屈立辉
何文波
肖维军
王芬
汪建平
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Fujian Forecam Optics Co Ltd
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Fujian Forecam Optics Co Ltd
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Priority to PCT/CN2021/097166 priority patent/WO2022198787A1/en
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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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144113—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 four groups only the first group being positive arranged +-++
    • 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
    • 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
    • G02B15/15—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 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention relates to a long-focus visible light continuous zoom lens which comprises a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with positive focal power, a diaphragm and a rear fixed group with positive focal power, wherein the front fixed group, the zoom group with negative focal power, the compensation group with positive focal power, the diaphragm and the rear fixed group with positive focal power are sequentially arranged from an object plane to an image plane along the incident direction of light rays, and the zoom group and the compensation group can axially move along an optical axis. The lens is compact in structure, the focal length variation range is 150 mm-2400 mm, the zoom ratio reaches 16 times, and the imaging target surface is larger than 1 inch.

Description

Long-focus visible light continuous zoom lens
Technical Field
The invention relates to a long-focus visible light continuous zoom lens.
Background
In order to realize the detection of a long-distance target and obtain high resolution, an optical system is required to have a longer focal length and a larger caliber, and a long focal length lens has the problems of poor on-axis color, particularly difficult secondary spectrum correction, and the contradiction between the system length and the volume limitation. Therefore, for a lens with an ultra-long focal length, a catadioptric optical structure is commonly used, the main reflective part of the catadioptric optical structure bears large focal power and generates no chromatic aberration, chromatic aberration of an optical system is easy to correct, and the system length can be made short. However, the reflective system has the defects of high processing difficulty, complex assembly and adjustment, central blocking and the like, and the zoom lens with large imaging target surface size and large zoom ratio cannot be realized by using a reflective structure. The transmission type system is mature in processing and adjusting process, does not have center blocking, but is difficult to realize good imaging quality and compact in structure in design.
Disclosure of Invention
The invention aims to provide a long-focus visible light continuous zoom lens which is compact in structure, the focal length change range is 150-2400 mm, the zoom ratio reaches 16 times, and the imaging target surface is larger than 1 inch.
The technical scheme of the invention is as follows: a long-focus visible light continuous zoom lens comprises a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with positive focal power, a diaphragm and a rear fixed group with positive focal power, which are sequentially arranged from an object plane to an image plane along the incident direction of light rays, wherein the zoom group and the compensation group can axially move along an optical axis.
Further, the front fixed group comprises three positive lenses and two negative lenses, namely a first biconvex lens, a first negative meniscus lens, a first positive meniscus lens, a first biconcave negative lens and a second positive meniscus lens; the first biconcave negative lens and the second meniscus positive lens are closely combined to form a first adhesive combination.
Further, the zoom group comprises two negative lenses and a positive lens, and the two negative lenses are a second negative meniscus lens, a third positive meniscus lens and a second biconcave negative lens in sequence; and the second negative meniscus lens and the third positive meniscus lens are closely combined to form a second adhesive combination.
Furthermore, the compensation group comprises three positive lenses and one negative lens, and the four positive meniscus lenses, the second double convex positive lens, the third negative meniscus lens and the fifth positive meniscus lens are sequentially arranged; and the third negative meniscus lens and the fifth positive meniscus lens are closely connected and combined to form a third adhesive group.
Further, the rear fixed group comprises three positive lenses and three negative lenses, namely a sixth positive meniscus lens, a fourth negative meniscus lens, a seventh positive meniscus lens, a third biconcave negative lens, a third biconvex positive lens and a fourth biconcave negative lens; the sixth positive meniscus lens and the fourth negative meniscus lens are closely combined to form a fourth adhesive group, the seventh positive meniscus lens and the third double-concave negative lens are closely combined to form a fifth adhesive group, and the third double-convex positive lens and the fourth double-concave negative lens are closely combined to form a sixth adhesive group.
Further, the diaphragm is an iris diaphragm, the maximum aperture at the short focus end is F5.95, and the maximum aperture at the long focus end is F10.
Further, the focal length f of the front fixed group1Focal length f of said variable magnification group2Focal length f of said compensation group L33Focal length f of said rear fixed group4Satisfies the following conditions: -0.2. ltoreq. f2/f1≤-0.1；0.10≤f3/f1≤0.45；0.02≤f4/f1≤0.13。
Further, the first glue combination is a combination of flint glass and crown glass, and the crown glass is made of low-refractive-index and low-dispersion materials.
Further, the second biconvex lens and the fifth meniscus positive lens are both made of ultra-low dispersion materials; the third positive meniscus lens is made of a high-refractive-index material.
Further, the seventh positive meniscus lens is made of a high-refractive-index material.
Compared with the prior art, the invention has the following advantages: the lens has compact structure and is beneficial to miniaturization; the focal length change range is 150 mm-2400 mm, the zoom ratio reaches 16 times, the imaging target surface is larger than 1 inch, and the lens corrects aberrations such as secondary spectrum. The lens adopts a plurality of glued combined lenses, is beneficial to correcting chromatic aberration of an optical system, is beneficial to reducing tolerance sensitivity and improving the assembling property of the lens.
Drawings
FIG. 1 is a diagram of a tele end optical system of the present invention;
FIG. 2 is a graph of MTF at the tele end of the present invention;
FIG. 3 is a spherical aberration curve for the tele end of the present invention.
FIG. 4 is a field curvature of the tele end of the present invention;
FIG. 5 is a distortion of the tele end of the present invention;
FIG. 6 is a chromatic aberration of magnification curve for the tele end of the present invention;
FIG. 7 is a diagram of a short focal length optical system of the present invention;
FIG. 8 is a MTF curve for the short focal end of the present invention;
FIG. 9 is a plot of spherical aberration for the short focal end of the present invention;
FIG. 10 is a plot of field curvature for the short focal end of the present invention;
FIG. 11 is a distortion of the short focal length end of the present invention;
FIG. 12 is a graph of chromatic aberration of magnification for a short focal end of the present invention;
in the figure: l1-front fixed group L2-variable power group L3-compensation group SP-diaphragm L4-rear fixed group 1-first biconvex lens 2-first negative meniscus lens 3-first positive meniscus lens 4-first negative biconcave lens 5-second positive meniscus lens 6-second negative meniscus lens 7-third positive meniscus lens 8-second negative meniscus lens 9-fourth positive meniscus lens 10-second biconvex positive lens 11-third negative meniscus lens 12-fifth positive lens 13-sixth positive meniscus lens 14-fourth negative meniscus lens 15-seventh positive meniscus lens 16-third biconcave negative lens 17-third biconvex positive lens 18-fourth biconcave negative lens.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to fig. 1 to 12
A long-focus visible light continuous zoom lens comprises a front fixed group L1 with positive focal power, a variable power group L2 with negative focal power, a compensation group L3 with positive focal power, a diaphragm SP and a rear fixed group L4 with positive focal power, which are sequentially arranged from an object plane to an image plane along the incident direction of light rays, wherein the variable power group and the compensation group can axially move along an optical axis. The zoom group is mainly used for focal length change of the lens; the compensation group is mainly used for compensating the change of the image surface position in the zooming process. The focal power arrangement form can better correct aberrations such as secondary spectrum and the like, ensure high zoom ratio, and is beneficial to reducing the length of an optical system and enabling the structure to be compact.
In this embodiment, the front fixed group includes three positive lenses and two negative lenses, which are a first biconvex lens 1, a first negative meniscus lens 2, a first positive meniscus lens 3, a first biconcave negative lens 4, and a second positive meniscus lens 5 in sequence; the first biconcave negative lens and the second meniscus positive lens are closely combined to form a first adhesive combination.
In this embodiment, the zoom group includes two negative lenses and one positive lens, which are a second negative meniscus lens 6, a third positive meniscus lens 7, and a second double-concave negative lens 8 in sequence; and the second negative meniscus lens and the third positive meniscus lens are closely connected and combined to form a second adhesive combination.
In this embodiment, the compensation group includes three positive lenses and one negative lens, and includes a fourth positive meniscus lens 9, a second double convex positive lens 10, a third negative meniscus lens 11, and a fifth positive meniscus lens 12 in sequence; and the third negative meniscus lens and the fifth positive meniscus lens are closely combined to form a third adhesive combination.
In this embodiment, the rear fixing group includes three positive lenses and three negative lenses, which are, in order, a sixth positive meniscus lens 13, a fourth negative meniscus lens 14, a seventh positive meniscus lens 15, a third biconcave negative lens 16, a third biconvex positive lens 17, and a fourth biconcave negative lens 18; the sixth positive meniscus lens and the fourth negative meniscus lens are closely combined to form a fourth adhesive group, the seventh positive meniscus lens and the third double-concave negative lens are closely combined to form a fifth adhesive group, and the third double-convex positive lens and the fourth double-concave negative lens are closely combined to form a sixth adhesive group.
In this embodiment, the parameter data and the air gap parameter of each lens are shown in tables 1 and 2.
TABLE 1 lens data sheet (Unit: mm)
Figure 349377DEST_PATH_IMAGE001
TABLE 2 variable parameter table (unit: mm)
Figure DEST_PATH_IMAGE002
In this embodiment, the diaphragm is an iris diaphragm, the maximum aperture at the short focus end is F5.95, and the maximum aperture at the long focus end is F10.
In this embodiment, the focal length f of the front fixed group L11Focal length f of the variable magnification group L22Focal length f of said compensation group L33SaidFocal length f of rear fixed group L44Satisfies the following conditions: f. of2/f1=0.14；f3/f1=0.26； f4/f1=0.08。
In this embodiment, the first glue composition is a combination of flint glass and crown glass, and the crown glass is made of a low-refractive-index low-dispersion material, so that on-axis chromatic aberration, especially second-order spectral aberration, at the telephoto end is well corrected, and imaging quality at the telephoto end is improved.
In this embodiment, the second biconvex lens and the fifth meniscus positive lens are both made of ultra-low dispersion materials, which is beneficial to correcting the second-order spectral aberration and spherical aberration at the short focus end and improving the imaging quality at the short focus end.
In this embodiment, the third positive meniscus lens and the seventh positive meniscus lens are made of a high refractive index material, which is beneficial to reducing high-level aberration and improving imaging resolution.
In this embodiment, the lens employs a plurality of cemented lenses, which is helpful for correcting chromatic aberration of the optical system, and is also beneficial for reducing tolerance sensitivity and improving the assemblability of the lens.
In this embodiment, the total length TTL and the telephoto end focal length f of the lens areLSatisfy TTL less than or equal to 0.42fLThe system has compact structure and is beneficial to miniaturization.
In this embodiment, the telephoto end focal length f of the lensLCan reach 2400mm, and the zoom ratio fL/fSNot less than 16, wherein fSThe short focal length.
Fig. 2 to 6 show the main image quality at the telephoto end of the lens, and fig. 8 to 12 show the main image quality at the short-focus end of the lens. The working wave band of the lens is visible light, in the figure, F is wavelength light with 0.486 μm, d is wavelength light with 0.587 μm, and C is wavelength light with 0.656 μm.
The size of the detector target surface applicable to the continuous zoom lens reaches 1 inch, and the MTF resolution is superior to 50 lp/mm.
It will be apparent to those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and it will be appreciated that various changes, modifications, substitutions and alterations can be made in the long focal length zoom lens without departing from the spirit and scope of the invention.

Claims (6)

1. A long-focus visible light continuous zoom lens is characterized by comprising a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with positive focal power, a diaphragm and a rear fixed group with positive focal power, which are sequentially arranged from an object plane to an image plane along the incident direction of light rays, wherein the zoom group and the compensation group can axially move along an optical axis; the front fixed group comprises three positive lenses and two negative lenses, namely a first biconvex lens, a first negative meniscus lens, a first positive meniscus lens, a first biconcave negative lens and a second positive meniscus lens; the first biconcave negative lens and the second meniscus positive lens are closely combined to form a first adhesive combination; the zoom group comprises two negative lenses and a positive lens, and is sequentially a second negative meniscus lens, a third positive meniscus lens and a second biconcave negative lens; the second negative meniscus lens and the third positive meniscus lens are tightly combined to form a second bonding group; the compensation group comprises three positive lenses and one negative lens, and the four positive meniscus lenses, the second double convex positive lens, the third negative meniscus lens and the fifth positive meniscus lens are sequentially arranged; the third negative meniscus lens and the fifth positive meniscus lens are tightly connected and combined to form a third adhesive combination; the rear fixed group comprises three positive lenses and three negative lenses, namely a sixth positive meniscus lens, a fourth negative meniscus lens, a seventh positive meniscus lens, a third biconcave negative lens, a third biconvex positive lens and a fourth biconcave negative lens in sequence; the sixth positive meniscus lens and the fourth negative meniscus lens are closely connected and combined to form a fourth glue group, the seventh positive meniscus lens and the third double-concave negative lens are closely connected and combined to form a fifth glue group, and the third double-convex positive lens and the fourth double-concave negative lens are closely connected and combined to form a sixth glue group.
2. The long focal length visible light continuous zoom lens according to claim 1, wherein the stop is an iris, the short focus maximum aperture is F5.95, and the long focus maximum aperture is F10.
3. The long focal length visible light continuous zoom lens of claim 1, wherein the focal length f of the front fixed group1Focal length f of the variable magnification group L22Focal length f of said compensation group3Focal length f of said rear fixed group4Satisfies the following conditions: -0.2. ltoreq. f2/f1≤-0.1；0.10≤f3/f1≤0.45；0.02≤f4/f1≤0.13。
4. The telephoto zoom lens according to claim 1, wherein the first glue set is a combination of flint glass and crown glass, and the crown glass is made of a low refractive index and low dispersion material.
5. The long-focus visible light continuous zoom lens according to claim 1, wherein the second biconvex lens and the fifth meniscus positive lens are both made of ultra-low dispersion material; the third positive meniscus lens is made of a high-refractive-index material.
6. The long focal length visible light continuous zoom lens of claim 1, wherein the seventh positive meniscus lens is made of a high refractive index material.
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PCT/CN2021/097166 WO2022198787A1 (en) 2021-03-22 2021-05-31 Telephoto visible light continuous zoom lens

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CN114518645A (en) * 2022-03-07 2022-05-20 深圳福特科光电有限公司 Optical lens
CN115685512B (en) * 2022-11-23 2024-03-15 福建福光股份有限公司 Zoom optical system with identical aperture super-large zoom ratio and imaging method thereof
CN116047733B (en) * 2022-12-20 2024-03-15 福建福光股份有限公司 Zoom lens structure and working method
CN116107073B (en) * 2022-12-25 2024-03-15 福建福光股份有限公司 Ultra-large multiple low-distortion short wave infrared optical system

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JP2001242379A (en) * 2000-02-29 2001-09-07 Casio Comput Co Ltd Zoom lens
CN101211000A (en) * 2006-12-28 2008-07-02 富士能株式会社 Telephoto lens
JP2008224909A (en) * 2007-03-09 2008-09-25 Nikon Corp Zoom lens, optical equipment and image forming method
CN104199178A (en) * 2014-08-06 2014-12-10 青岛歌尔声学科技有限公司 Zoom lens
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