CN1061761C - Varifocal lens optical system - Google Patents

Varifocal lens optical system Download PDF

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Publication number
CN1061761C
CN1061761C CN96107859A CN96107859A CN1061761C CN 1061761 C CN1061761 C CN 1061761C CN 96107859 A CN96107859 A CN 96107859A CN 96107859 A CN96107859 A CN 96107859A CN 1061761 C CN1061761 C CN 1061761C
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China
Prior art keywords
lens
lens combination
optical system
combination
zoom
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Expired - Lifetime
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CN96107859A
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Chinese (zh)
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CN1167268A (en
Inventor
张尤什
杨镇五
金容郁
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of CN1167268A publication Critical patent/CN1167268A/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
    • G02B3/00—Simple or compound lenses
    • G02B3/0087—Simple or compound lenses with index gradient
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

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

Abstract

A varifocal lens optical system including a first lens set for focalizing scenery and having positive ratio of enlargement and focus as F[1]; a second lens set having negative ratio of enlargement and focus as F[2], and varying the size of the image of the first lens set focus by moving along optical axis; a third lens set having positive ratio of enlargement and focus as F[3] for transmitting varied image by the second lens set; and a fourth lens set having positive ratio of enlargement and focus as F[4] for focusing variation of corresponding scenery by moving along optical axis, meantime compensating the displacement of picture dot varying with the second lens set position.

Description

Zoom lens optical system
The present invention relates to a kind of zoom lens optical system that is applicable to frequency still camera and video frequency camera, relate in particular to a kind of optical property, promptly have the zoom lens optical system that high zoom ratios performance and length of lens significantly reduce through what improve.
In general, all zoom lens optical systems of frequency still camera and video frequency camera that is applicable to have all required the good optical performance, as the large aperture, and high zoom ratios, and size is little.Zoom lens with a kind of like this structure must make multiple lens move along a definite track simultaneously and focus, thereby the structure of zoom lens optical system just becomes complicated unavoidably.Simultaneously, requiring under lofty tone coke ratio and the large aperture situation, increasing, thereby its miniaturization just becomes very difficult in order to proofread and correct the required lens number of aberration.
For solving some above-mentioned problem, the applicant once disclosed " a kind of optical system that adopts non-spherical lens " in korean patent application Nos.93-29590,93-29591 and 93-29592.This invention has partly solved aforesaid some problem by fixing the miniaturization that some lens combination of selecting for use realizes zoom lens.Yet, since with the problem of its structurally associated, miniaturization is limited to and constitutes the lower Zoom lens optical system of a kind of performance.
Therefore, the present invention is intended to overcome the restriction of adopting the optical system that non-spherical lens becomes that discloses previously.The object of the present invention is to provide a kind of miniaturization and zoom lens optical system that have good optical properties such as lofty tone coke ratio and large aperture.
For achieving the above object, a kind of zoom lens optical system that provides here comprises: one has the positive refraction focal power and focal length is F 1First lens combination, be used for scenery is focused on; One has the negative refraction focal power and focal length is F 2Second lens combination, this lens combination is portable assembling, changes the image size that is focused on by first lens combination by moving along the optical axis identical with first lens combination; One has the positive refraction focal power and focal length is F 3The 3rd lens combination, the fixed installation of this lens combination, the image that changes through second lens combination with transmission; One has the positive refraction focal power and focal length is F 4The 4th lens combination, this lens combination is along the portable assembling of optical axis, so that the variation of corresponding subject distance focuses on, simultaneously, also by along the moving of optical axis, the image point displacement that becomes with the second lens combination position is compensated, and satisfy following condition: 1.0＜| F 2/ F W|＜1.5 0.9＜| F 1/ F 3|＜1.5 2.5＜| F 4/ F 2|＜3.5 15.4＜T L/ F W＜18.4 wherein, F WBe focal length in the zoom lens group of wide-angle position, T LBe first lens surface of first lens combination and the distance between image field.
In above-mentioned zoom lens optical system, preferred combination of lenses is: first lens combination has three convex lens, second lens combination has two convex lens and concavees lens, and the 3rd lens combination has convex lens and concavees lens, and the 4th lens combination has two convex lens.
Here, describe one in detail preferred embodiment with reference to accompanying drawing, above-mentioned purpose then of the present invention and advantage will become more clear.In the accompanying drawings:
Fig. 1 is the optical devices sectional view of a zoom lens optical system according to the present invention at wide-angle position;
Fig. 2 is the optical devices sectional view of a zoom lens optical system according to the present invention in the Zhong Jiao position;
Fig. 3 is the optical devices sectional view of a zoom lens optical system according to the present invention in the telephoto position;
Fig. 4-Fig. 8 is the aberration diagram of the zoom lens optical system at wide-angle position shown in Figure 1;
Fig. 9-Figure 13 is the aberration diagram of the zoom lens optical system in the Zhong Jiao position shown in Figure 2;
Figure 12-Figure 18 is the aberration diagram of the zoom lens optical system in the telephoto position shown in Figure 3; And
Figure 19 is the diagram of the asphericity coefficient of key drawing 1-the shown in Figure 3 the 12nd and the 17th lens face.
With reference to Fig. 1-Fig. 3, this zoom lens optical system is arranged in order by one first lens combination 1, one second lens combination 2, the 3rd lens combination 3 and one the 4th lens combination 4 and constitutes, and wherein first lens combination is near scenery.
First lens combination 1 is made of three convex lens, and under presetting angle the incident light of assembling is had the positive refraction focal power.
Second lens combination 2 is along the optical axis portable assembling identical with first lens combination 1, to be used for changing the size of incident image.This lens combination has the negative refraction focal power, and is made up of two convex lens and concavees lens.
3 fixed installations of the 3rd lens combination, with the image that transmission changes through second lens combination 2, it is made of convex lens and concavees lens at least, and has the positive refraction focal power.
The 4th lens combination 4 is made up of two convex lens and is had the positive refraction focal power, and this lens combination is used for compensating the image point displacement that produces owing to zoom operation when image passes through the 3rd lens combination, and focuses on by the variation of moving with subject distance along optical axis.
Provide between the radius-of-curvature, adjacent lens surface of each lens that constitutes the said lens group distance (shown in Fig. 1-Fig. 3), refractive index and chromatic dispersion in the table 1 along optical axis:
Table 1
Radius-of-curvature (R) Lenticular spacing (D) Refractive index (N) Chromatic dispersion (V)
R1=54.3509 D1=0.9 N D1=1.805 V D1=25.5
R2=22.6448 D2=6.0 N D2=1.603 V D2=60.7
R3=-99.6975 D3=0.4 N D3=air
R4=19.8603 D4=3.6 N D4=1.623 V D4=56.9
R5=64.203 D5=A N D5=air
R6=53.4308 D6=0.8 N D6=1.694 V D6=53.3
R7=5.9161 D7=2.5454 N D7=air
R8=-7.5942 D8=0.8 N D8=1.64 V D8=60.2
R9=6.9415 D9=2.3 N D9=1.805 V D9=25.5
R10=45.9523 D10=B N D10=air
R11=stop D11=1.2 N D11=air
R12=12.497 (aspheric surface 1) D12=2.8 N D12=1.589 V D12=61.2
R13=-56.6871 D13=1 N D13=1.805 V D13=25.5
R14=334.4992 D14=C N D14=air
R15=11.6135 D15=0.8 N D15=1.805 V D15=25.5
R16=6.7519 D16=3.9 N D16=1.589 V D16=61.2
R17=～18.533 (aspheric surface 2) D17=D N D17=air
Wherein A, B, C and D are expressed as follows:
A Wide-angle position 6．4000 C Wide-angle position 12．4696
Zhong Jiao position remote position 14．9420 23．4840 Zhong Jiao position remote position 9．7983 11．1925
B Wide-angle position Zhong Jiao position remote position 21．8000 13．2580 4．7l60 D Wide-angle position Zhong Jiao position remote position 9．3071 11．9783 10．5841
Minimum and make the zoom lens subminiaturization for the aberration that makes zoom ratio, require zoom lens optical system to satisfy following condition: 1.0＜| F 2/ F W|＜1.5 (1) 0.9＜| F 1/ F 3|＜1.5 (2) 2.5＜| F 4/ F 2|＜3.5 (3) 15.4＜T L/ F W＜18.4 (4) wherein, F i(i=1,2,3,4) is the focal length of each lens combination, F wBe focal length at the zoom lens of wide-angle position, T LBe first lens surface of first lens combination and the distance between the image field.
Formula (1) shows the focal power condition of second lens combination 2, if its focal length is lower than lower limit, promptly focuses on grow, and to the curvature of field over-compensation.If its focal length surpasses the upper limit, then increase, thereby make whole optical system long and be difficult to miniaturization for obtaining the scope that certain zooming range moves second lens combination 2.
Formula (2) is illustrated in the first, the 3rd lens combination 1 of fixed in space installation and 3 focal distance ratio, is lower than lower limit as this ratio, and the focusing of first lens combination 1 becomes too strong to the ball aberration of proofreading and correct telephotograph.Yet, if its ratio is higher than the upper limit, considers and will move second lens combination 2 satisfying zoom ratio that the first, the 3rd lens combination 1 and 3 spacing become long, thereby make zoom lens be difficult to miniaturization.
Formula (3) is represented the focal distance ratio of the 4th, second lens combination 4 and 2, if this ratio is lower than lower limit, is the aberration of proofreading and correct at zoom position, and it is too strong that the focusing of the 4th lens combination 4 becomes.Yet if its ratio is higher than the upper limit, the displacement of the 4th lens combination 4 increases, and makes the overall length of zoom-lens system oversize.
Formula (4) expression if its length is lower than lower limit, is difficult to obtain high zoom ratio to the restriction of whole optical system length.If its length surpasses the upper limit, then it seems that from miniaturization whole optical system seems oversize.
Since forming the light receiving surface of convex lens of the 3rd lens combination 3 and the light-emitting face of forming the convex lens of the 4th lens combination 4 is not sphere, be labeled as aspheric surface 1 and aspheric surface 2 respectively, corresponding asphericity coefficient AD, AE, AF and AG are expressed as follows:
Aspheric surface 1-asphericity coefficient AD=-0.1573915 * 1 -4AE=-0.3915265 * 10 -7AF=0 AG=0 X=1.48981
Aspheric surface 2-asphericity coefficient AD=0.1699549 * 10 -3AE=-0.69229904 * 10 -8AF=-0.1196519 * 10 -6AG=0.2441446 * 10 -8X=-0.90607 Figure 19 represents the relativeness of an aspheric surface and a sphere, wherein X AExpression is the aspheric sagitta of arc along the bias of the optical axis direction and a standard garden conical surface X A = Y 2 / R 2 1 + { 1 - Y 2 / R 2 } 1 / 2 + AD Y 4 + AE Y 6 + AE Y 8 + AG Y 10 R is a lens radius in the formula, and Y is the height from optical axis.
Here, a diaphragm R11 (not giving explanation) the improper light that aberration produced that will pass first, second lens combination 1 and 2 sieves.
The aperture of zoom lens can be amplified in the scope from F/2.4 to F/1.4.
Fig. 4 shows aberration at the Zoom lens optical system of wide-angle position respectively to each figure of Fig. 8.
Fig. 4 illustrates vertical (meridian direction) ball aberration of the light of the relative different wave length of optical system, for the purpose of clearer and more definite, provide in 0.50,0.71 and 1.00 image fields ball aberration 5,6 and 7 among the figure corresponding to different wave length 0.587 μ m, 0.4861 μ m and 0.6563 μ m.
Fig. 5 explanation is at the ball aberration 8 and 9 of broadwise (sagitta of arc line direction), i.e. latitudinal ball aberration 8 of Z-in 0.50,0.71 and 1.00 image fields and the latitudinal ball aberration 9 of Y-respectively.Fig. 6 then illustrates broadwise (lonely edge direction) the ball aberration 5,6 and 7 corresponding to each wavelength.
Fig. 7 illustrates curvature of field, i.e. meridian image field and sagitta of arc curvature of field 10 and 11.Fig. 8 illustrates lateral chromatism aberration 12 and distortion percentage 13.
Fig. 9-Figure 13 shows the aberration of the Zoom lens optical system in the Zhong Jiao position shown in Figure 2 respectively, among the figure description of aberration identical with Fig. 4-Fig. 8, and similar aberration adopted identical figure notation.
Figure 14-Figure 18 shows the aberration of the zoom lens light system of telephoto shown in Figure 3 position respectively, among the figure description of aberration identical with Fig. 4-Fig. 8, and similar aberration adopted identical figure notation.
Therefore, the Zoom lens optical system according to the present invention, because of its elevation zoom ratio with 14 can make the camera coverage broadening, and because of it has large aperture from F/2.4 to F/1.4, so can take quite dark scenery.In addition, it also has little, the lightweight advantage of volume; Have good aberration compensation, and adopt two non-spherical lenses and make the lens decreased number; Also because of having the optical system of its similar, so avoided the color on the CCD image sensor fuzzy in telecentric beam path.

Claims (2)

1. zoom lens optical system comprises successively from object space:
One has the positive refraction focal power and focal length is F 1First lens combination, be used for scenery is focused on;
One has the negative refraction focal power and focal length is F 2Second lens combination, this lens combination is portable assembling, changes the image size that is focused on by described first lens combination by moving along the optical axis identical with first lens combination;
One has the positive refraction focal power and focal length is F 3The 3rd lens combination, the fixed installation of this lens combination, the image that changes through described second lens combination with transmission; And
One has the positive refraction focal power and focal length is F 4The 4th lens combination, this lens combination is along the portable assembling of optical axis, so that the variation of corresponding subject distance focuses on, simultaneously, also by along the moving of optical axis, the image point displacement that becomes with the described second lens combination position is compensated, and satisfy following condition: 1.0＜| F 2/ F W|＜1.5 0.9＜| F 1/ F 3|＜1.5 2.5＜| F 4/ F 2|＜3.5 15.4＜T L/ F W＜18.4
Wherein, F WBe focal length in the zoom lens group of wide-angle position, T LBe first lens surface of described first lens combination and the distance between image field.
2. Zoom lens optical system as claimed in claim 1, wherein said first lens combination has three convex lens, described second lens combination has two convex lens and concavees lens, described the 3rd lens combination has convex lens and concavees lens, and described the 4th lens combination has two convex lens.
CN96107859A 1995-06-14 1996-06-13 Varifocal lens optical system Expired - Lifetime CN1061761C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1019950015769A KR970002389A (en) 1995-06-14 1995-06-14 Zoom lens optics
KR15769/95 1995-06-14
KR15769/1995 1995-06-14

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CN1167268A CN1167268A (en) 1997-12-10
CN1061761C true CN1061761C (en) 2001-02-07

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Cited By (1)

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CN101013192B (en) * 2006-02-03 2011-02-09 松下电器产业株式会社 Zoom lens system, lens barrel, imaging device and camera

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JP3936625B2 (en) * 2002-05-27 2007-06-27 オリンパス株式会社 Zoom lens for Greenough-type stereomicroscope
JP3927866B2 (en) * 2002-06-04 2007-06-13 キヤノン株式会社 Zoom lens and photographing apparatus
JP3977150B2 (en) * 2002-06-04 2007-09-19 キヤノン株式会社 Zoom lens and photographing apparatus
JP4366110B2 (en) * 2003-05-06 2009-11-18 キヤノン株式会社 Zoom lens and optical apparatus having the same
WO2007010822A1 (en) * 2005-07-19 2007-01-25 Matsushita Electric Industrial Co., Ltd. Zoom lens system and imaging optical device using the same
KR100799218B1 (en) * 2006-09-13 2008-01-29 삼성테크윈 주식회사 Compact zoom lens
JP5072474B2 (en) * 2007-08-06 2012-11-14 キヤノン株式会社 Zoom lens and imaging apparatus having the same
JP5206174B2 (en) * 2008-07-08 2013-06-12 株式会社リコー Zoom lens, camera, and portable information terminal device
CN102087404B (en) * 2009-12-07 2012-07-18 广圆光电股份有限公司 Zoom lens
JP5648907B2 (en) * 2010-11-26 2015-01-07 株式会社ニコン Magnification optical system and optical instrument
CN107589534B (en) 2017-09-04 2019-09-17 浙江大华技术股份有限公司 A kind of lens system and camera lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101013192B (en) * 2006-02-03 2011-02-09 松下电器产业株式会社 Zoom lens system, lens barrel, imaging device and camera

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CN1167268A (en) 1997-12-10

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