I lllll llllllll Ill lllll lllll lllll lllll lllll 111111111111111111111111111111111
`US009128267B2
`
`c12) United States Patent
`Ogino et al.
`
`(IO) Patent No.:
`(45) Date of Patent:
`
`US 9,128,267 B2
`Sep.8,2015
`
`(54)
`
`IMAGING LENS AND IMAGING APPARATUS
`INCLUDING THE IMAGING LENS
`
`(71) Applicant: FUJIFILM Corporation, Tokyo (JP)
`
`(58) Field of Classification Search
`CPC ................................................... G02B 13/0045
`USPC .......................................................... 359/714
`See application file for complete search history.
`
`(72)
`
`Inventors: Tatsuyuki Ogino, Saitama-ken (JP);
`Michio Cho, Saitama-ken (JP); Yoshiaki
`Ishii, Saitama-ken (JP)
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`(73) Assignee: FUJIFILM CORPORATON, Tokyo
`(JP)
`
`( *) Notice:
`
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 14/226,172
`
`(22) Filed:
`
`Mar. 26, 2014
`
`(65)
`
`Prior Publication Data
`
`US 2014/0293453 Al
`
`Oct. 2, 2014
`
`(30)
`
`Foreign Application Priority Data
`
`Mar. 29, 2013
`
`(JP) ................................. 2013-072282
`
`(51)
`
`Int. Cl.
`G02B 3102
`G02B 13100
`(52) U.S. Cl.
`CPC .................................. G02B 1310045 (2013.01)
`
`(2006.01)
`(2006.01)
`
`1112012 Lin et al.
`8,310,768 B2
`2010/0253829 Al* 10/2010 Shinohara ..................... 348/340
`412012 Tang et al.
`.................... 359/714
`2012/0087020 Al*
`2013/0033765 Al
`2/2013 Tsai et al.
`* cited by examiner
`
`James Jones
`Primary Examiner -
`(74) Attorney, Agent, or Firm - Young & Thompson
`
`ABSTRACT
`(57)
`An imaging lens substantially consists of, in order from an
`object side, five lenses of a first lens that has a positive
`refractive power and has a meniscus shape which is convex
`toward the object side, a second lens that has a biconcave
`shape, a third lens that has a meniscus shape which is convex
`toward the object side, a fourth lens that has a meniscus shape
`which is convex toward the image side; and a fifth lens that
`has a negative refractive power and has at least one inflection
`point on an image side surface. Further, the following condi(cid:173)
`tional expression (1) is satisfied.
`1.4<j/jl <4
`
`(1)
`
`21 Claims, 14 Drawing Sheets
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`
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 1of14
`
`US 9,128,267 B2
`
`FIG.1
`
`EXAMPLE 1
`
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`/
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`
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 2of14
`
`US 9,128,267 B2
`
`FIG.2
`
`EXAMPLE 2
`
`CG
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`
`Apple v. Corephotonics
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 3of14
`
`US 9,128,267 B2
`
`FIG.3
`
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`
`Apple v. Corephotonics
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 4of14
`
`US 9,128,267 B2
`
`FIG.4
`
`EXAMPLE 4
`
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`
`Apple v. Corephotonics
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 5of14
`
`US 9,128,267 B2
`
`FIG.5
`
`EXAMPLE 5
`
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`
`---100(R14)
`
`Apple v. Corephotonics
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`U.S. Patent
`
`Sep.8,2015
`
`Sheet 6of14
`
`US 9,128,267 B2
`
`FIG.6
`
`EXAMPLE 6
`
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`
`Apple v. Corephotonics
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`Page 7 of 28
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`

`

`U.S. Patent
`
`Sep.8,2015
`
`Sheet 7of14
`
`US 9,128,267 B2
`
`FIG.7
`
`EXAMPLE 1
`
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`
`Apple v. Corephotonics
`
`Page 8 of 28
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`

`

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`
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`
`EXAMPLE 1
`
`FIG.8
`
`Apple v. Corephotonics
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`Page 9 of 28
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`

`

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`
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`
`EXAMPLE 2
`
`FIG.9
`
`Apple v. Corephotonics
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`Page 10 of 28
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`

`

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`
`EXAMPLE 3
`
`FIG.10
`
`Apple v. Corephotonics
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`Page 11 of 28
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`

`

`-....l = N
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`
`EXAMPLE4
`
`FIG.11
`
`Fno. = 3.04
`
`Apple v. Corephotonics
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`

`

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`
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`
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`
`EXAMPLE 5
`
`FIG.12
`
`Apple v. Corephotonics
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`

`

`-....l = N
`
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`
`EXAMPLE 6
`
`FIG.13
`
`······--···-· g-LINE
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`:, I
`
`-100µ.m
`
`Apple v. Corephotonics
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`

`U.S. Patent
`
`Sep.8,2015
`
`Sheet 14of14
`
`US 9,128,267 B2
`
`~1
`
`FIG.14
`
`541
`
`501 "'
`FIG.15
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`Apple v. Corephotonics
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`Page 15 of 28
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`

`

`1. Field of the Invention
`The present invention relates to a fixed-focus imaging lens
`that forms an optical image of a subject on an imaging device,
`such as a charge coupled device (CCD) and a complementary
`metal oxide semiconductor (CMOS), and to an imaging appa(cid:173)
`ratus, such as a digital still camera, a cellular phone with a
`camera, a mobile information terminal (PDA: Personal Digi-
`tal Assistance), a smartphone, a tablet terminal, and a mobile
`game machine, on which the imaging lens is mounted to 15
`perform photography.
`2. Description of the Related Art
`As personal computers have become popular in homes,
`digital still cameras which are capable of inputting image
`information about photographed scenes, persons, and the like 20
`into the personal computers have spread rapidly. Further, a
`cellular phone, a smartphone, or a tablet terminal in which a
`camera module for inputting images is installed has been
`increasing. Such apparatus having an imaging function uses
`an imaging device, such as a CCD and a CMOS. Recently, 25
`because the imaging device has been miniaturized, there has
`been also a demand to miniaturize the whole of the imaging
`apparatus and an imaging lens mounted thereon. Further,
`since the number of pixels included in the imaging device has
`also been increasing, there has been a demand to enhance the 30
`resolution and performance of the imaging lens. For example,
`there has been a demand for performance corresponding to
`high resolution of 5 megapixels or higher, and preferably
`performance corresponding to high resolution of 8 megapix- 35
`els or higher.
`To satisfy such demands, it can be considered that the
`imaging lens is composed of five or six lenses, which are a
`relatively large number oflenses. For example, U.S. Pat. No.
`8,310, 768 (Patent Document 1) and U.S. Patent Application 40
`Publication No. 20130033765 (Patent Document 2) propose
`an imaging lens composed of five lenses. The imaging lens
`disclosed in Patent Documents 1 and 2 substantially consists
`of, in order from an object side, five lenses of a first lens that
`has a positive refractive power, a second lens that has a nega- 45
`tive refractive power, a third lens that has a positive refractive
`power, a fourth lens that has a positive refractive power, and
`a fifth lens that has a negative refractive power.
`
`2
`The imaging lens of the present invention is an imaging
`lens substantially consisting of, in order from an object side,
`five lenses of:
`a first lens that has a positive refractive power and has a
`meniscus shape which is convex toward the object side;
`a second lens that has a biconcave shape;
`a third lens that has a meniscus shape which is convex
`toward the object side;
`a fourth lens that has a meniscus shape which is convex
`10 toward an image side; and
`a fifth lens that has a negative refractive power and has at
`least one inflection point on an image side surface,
`in which the following conditional expression (1) is satis(cid:173)
`fied:
`
`1.4<fljl<4
`
`(1), where
`
`f is a focal length of a whole system, and
`fl is a focal length of the first lens.
`According to the imaging lens of the present invention, in
`the imaging lens which is composed of five lenses as a whole,
`a configuration of each lens element of the first to fifth lenses
`is optimized. Therefore, it is possible to achieve a lens system
`that has high resolution performance while decreasing the
`total length thereof.
`In the imaging lens of the present invention, the expression
`"substantially consisting of five lenses" means that the imag(cid:173)
`ing lens of the present invention may include not only the five
`lenses but also a lens which has substantially no refractive
`power, optical elements, such as a stop and a cover glass,
`which are not a lens, mechanism parts, such as a lens flange,
`a lens barrel, an imaging device and a hand shake blur cor(cid:173)
`rection mechanism, and the like. When the lens includes an
`aspheric surface, the reference sign of the surface shape and
`refractive power of the lens is considered in a paraxial region.
`In the imaging lens of the present invention, by employing
`and satisfying the following desirable configuration, it is pos(cid:173)
`sible to make the optical performance thereof better.
`In the imaging lens of the present invention, it is desirable
`that the fourth lens have a positive refractive power.
`It is desirable that the imaging lens of the present invention
`further include an aperture stop that is disposed on the object
`side of an object side surface of the second lens.
`It is desirable that the imaging lens of the present invention
`satisfy any of the following conditional expressions (1-1) to
`(10). It should be noted that, as a desirable mode, any one of
`the conditional expressions (1-1) to (10) may be satisfied, or
`an arbitrary combination thereof may be satisfied. However,
`regarding the conditional expression (7-1 ), when the compos(cid:173)
`ite refractive power of the first to third lenses is positive, it is
`50 desirable to satisfy the conditional expression (7-1 ).
`
`US 9, 128,267 B2
`
`1
`IMAGING LENS AND IMAGING APPARATUS
`INCLUDING THE IMAGING LENS
`
`BACKGROUND OF THE INVENTION
`
`SUMMARY OF THE INVENTION
`
`In particular, for the imaging lenses used in apparatuses, of
`which the thickness has been decreased, such as a cellular
`phone, a smartphone or a tablet terminal, a demand to
`decrease the total length of the lens has been increased more 55
`and more. Hence, it is necessary to further decrease the total
`lengths of the imaging lenses disclosed in Patent Documents
`1and2.
`The present invention has been made in view of the above(cid:173)
`mentioned circumstances and an object thereof is to provide 60
`an imaging lens capable of achieving high imaging perfor(cid:173)
`mance in the range from the central angle of view to the
`peripheral angle of view while achieving a decrease in the
`total length thereof. Another object of the present invention is
`to provide an imaging apparatus capable of obtaining a pho- 65
`tographed image with high resolution through the imaging
`lens which is mounted thereon.
`
`1.5 <fljl <3.5
`
`-3 <f/f2<-0.85
`
`-2.5<flj2<-0.9
`
`0.78<fljl2<2.5
`
`0.8<fljl2<2
`
`-2<f!j345<0
`
`-1.5 <flj345<-0.05
`
`-0.5 <fl!j3<0.4
`
`-0.4<fl!j3<0.2
`
`(1-1),
`
`(2),
`
`(2-1),
`
`(3),
`
`(3-1),
`
`(4),
`
`(4-1),
`
`(5),
`
`(5-1),
`
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`

`3
`-1 <(R3f-R3r)/(R3f+R3r)<l.2
`
`-0.6<(R3f-R3r)/(R3f+R3r)<l
`
`-4<j!f5<-0.2
`
`-3 <j!f5<-0.4
`
`0.5<ftan w!R5r<10
`
`0.7<ftan w!R5r<3
`
`-0.9<j!j3<0.7
`
`0.05<D7/f<0.2
`
`US 9, 128,267 B2
`
`(6),
`
`(6-1),
`
`(7),
`
`(7-1),
`
`(8),
`
`10
`
`(8-1),
`
`4
`FIG. 4 is a lens cross-sectional view illustrating a fourth
`configuration example of an imaging lens according to an
`embodiment of the present invention and corresponding to
`Example 4;
`FIG. 5 is a lens cross-sectional view illustrating a fifth
`configuration example of an imaging lens according to an
`embodiment of the present invention and corresponding to
`Example 5;
`FIG. 6 is a lens cross-sectional view illustrating a sixth
`configuration example of an imaging lens according to an
`embodiment of the present invention and corresponding to
`Example 6;
`FIG. 7 is a ray diagram of the imaging lens shown in FIG.
`
`1;
`
`(9), and
`
`(10), where
`
`15
`
`FIG. 8 is an aberration diagram illustrating various aberra-
`tions ofan imaging lens according to Example 1 of the present
`invention, where Section A shows a spherical aberration,
`Section B shows astigmatism (curvature of field), Section C
`shows distortion, and Section D shows a lateral chromatic
`20 aberration;
`FIG. 9 is an aberration diagram illustrating various aberra(cid:173)
`tions ofan imaging lens according to Example 2 of the present
`invention, where Section A shows a spherical aberration,
`Section B shows astigmatism (curvature of field), Section C
`25 shows distortion, and Section D shows a lateral chromatic
`aberration;
`FIG. 10 is an aberration diagram illustrating various aber(cid:173)
`rations of an imaging lens according to Example 3 of the
`present invention, where Section A shows a spherical aberra-
`30 ti on, Section B shows astigmatism (curvature of field), Sec(cid:173)
`tion C shows distortion, and Section D shows a lateral chro(cid:173)
`matic aberration;
`FIG. 11 is an aberration diagram illustrating various aber(cid:173)
`rations of an imaging lens according to Example 4 of the
`35 present invention, where Section A shows a spherical aberra(cid:173)
`tion, Section B shows astigmatism (curvature of field), Sec(cid:173)
`tion C shows distortion, and Section D shows a lateral chro(cid:173)
`matic aberration;
`FIG. 12 is an aberration diagram illustrating various aber-
`40 rations of an imaging lens according to Example 5 of the
`present invention, where Section A shows a spherical aberra(cid:173)
`tion, Section B shows astigmatism (curvature of field), Sec(cid:173)
`tion C shows distortion, and Section D shows a lateral chro-
`matic aberration;
`FIG. 13 is an aberration diagram illustrating various aber-
`rations of an imaging lens according to Example 6 of the
`present invention, where Section A shows a spherical aberra(cid:173)
`tion, Section B shows astigmatism (curvature of field), Sec(cid:173)
`tion C shows distortion, and Section D shows a lateral chro-
`50 matic aberration;
`FIG. 14 is a diagram illustrating an imaging apparatus
`which is a cellular phone terminal including the imaging lens
`according to the present invention; and
`FIG. 15 is a diagram illustrating an imaging apparatus
`55 which is a smartphone including the imaging lens according
`to the present invention.
`
`f is a focal length of a whole system,
`fl is a focal length of the first lens,
`f2 is a focal length of the second lens,
`f3 is a focal length of the third lens,
`f5 is a focal length of the fifth lens,
`fl2 is a composite focal length of the first lens and the
`second lens,
`f345 is a composite focal length of the third to fifth lenses,
`R3f is a paraxial radius of curvature of an object side
`surface of the third lens,
`R3r is a paraxial radius of curvature of an image side
`surface of the third lens,
`R5r is a paraxial radius of curvature of an image side
`surface of the fifth lens,
`D7 is a spacing on an optical axis between the third lens and
`the fourth lens, and
`co is a half angle of view.
`The imaging apparatus of the present invention includes
`the imaging lens of the present invention.
`In the imaging apparatus of the present invention, imaging
`signals with high resolution can be obtained based on an
`optical image with high resolution obtained by the imaging
`lens of the present invention.
`According to the imaging lens of the present invention, in
`the imaging lens which is composed of five lenses as a whole,
`a configuration of each lens element is optimized, and par(cid:173)
`ticularly the shapes of the first and fifth lenses are appropri(cid:173)
`ately formed. Therefore, it is possible to achieve a lens system
`that has high resolution performance in the range from the 45
`central angle of view to the peripheral angle of view while
`decreasing the total length thereof.
`Further, according to the imaging apparatus of the present
`invention, imaging signals based on an optical image formed
`by the imaging lens of the present invention, which has high
`imaging performance, are output. Therefore, it is possible to
`obtain a photographed image with high resolution.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a lens cross-sectional view illustrating a first
`configuration example of an imaging lens according to an
`embodiment of the present invention and corresponding to
`Example 1;
`FIG. 2 is a lens cross-sectional view illustrating a second 60
`configuration example of an imaging lens according to an
`embodiment of the present invention and corresponding to
`Example 2;
`FIG. 3 is a lens cross-sectional view illustrating a third
`configuration example of an imaging lens according to an 65
`embodiment of the present invention and corresponding to
`Example 3;
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`Hereinafter, embodiments of the present invention will be
`described in detail with reference to the accompanying draw(cid:173)
`ings.
`FIG. 1 shows a first configuration example of an imaging
`lens according to a first embodiment of the present invention.
`The configuration example corresponds to a lens configura(cid:173)
`tion of a first numerical value example (Table 1 and Table 2)
`
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`US 9, 128,267 B2
`
`5
`to be described later. Likewise, FIGS. 2 to 6 show cross
`sections of second to sixth configuration examples corre(cid:173)
`sponding to the imaging lenses according to second to sixth
`embodiments to be described later. The second to sixth con(cid:173)
`figuration examples correspond to lens configurations of the
`second to sixth numerical value examples (Tables 3 to 12) to
`be described later. In FIGS. 1 to 6, the reference sign Ri
`represents a radius of curvature of i-th surface, where the
`number i is the sequential number that sequentially increases
`as it gets closer to an image side (an imaging side) when a
`surface of a lens element closest to an object side is regarded
`as a first surface. The reference sign Di represents an on-axis
`surface spacing between i-th surface and (i+l) th surface on
`an optical axis ZL Since the respective configuration
`examples are basically similar in configuration, the following
`description will be given on the basis of the first configuration
`example of the imaging lens shown in FIG. 1, and the con(cid:173)
`figuration examples shown in FIGS. 2 to 6 will be also
`described as necessary. Further, FIG. 7 is an optical path
`diagram of the imaging lens L shown in FIG.1, and shows an
`optical path of rays 2 on the optical axis from an object point
`at the infinite distance and an optical path of rays 3 at the
`maximum angle of view.
`An imaging lens L according to an embodiment of the
`present invention is appropriate to be used in various kinds of
`imaging apparatuses using imaging devices such as a CCD
`and a CMOS. Especially, the imaging lens Lis appropriate to
`be used in relatively small-sized mobile terminal apparatus,
`for example, such as a digital still camera, a cellular phone
`with a camera, a smartphone, a tablet terminal, and a PDA.
`This imaging lens L includes, along the optical axis Zl, a first
`lens Ll, a second lens L2, a third lens L3, a fourth lens L4, and
`a fifth lens L5 in this order from the object side.
`FIG.14 is a schematic diagram illustrating a cellular phone 35
`terminal, which is an imaging apparatus 1 according to an
`embodiment of the present invention. The imaging apparatus
`1 according to the embodiment of the present invention
`includes imaging lens L according to the present embodiment
`and an imaging device 100 (refer to FIG. 1), such as a CCD, 40
`which outputs imaging signals based on an optical image
`formed by the imaging lens L. The imaging device 100 is
`disposed at an image formation surface (image plane R14) of
`the imaging lens L.
`FIG. 15 is a schematic diagram illustrating a smartphone 45
`which is an imaging apparatus 501 according to an embodi(cid:173)
`ment of the present invention. The imaging apparatus 501
`according to the embodiment of the present invention
`includes a camera unit 541 including the imaging lens L
`according to the present embodiment and the imaging device 50
`100 (refer to FIG. 1), such as a CCD, which outputs imaging
`signals based on an optical image formed by the imaging lens
`L. The imaging device 100 is disposed at the image formation
`surface (image plane R14) of the imaging lens L.
`Various optical members CG may be disposed between the 55
`fifth lens L5 and the imaging device 100 based on the con(cid:173)
`figuration of a camera on which the imaging lens is mounted.
`For example, a flat-plate-shaped optical member, such as a
`cover glass for protecting an imaging surface and an infrared(cid:173)
`ray cut filter, may be disposed. In this case, for example, a 60
`flat-plate-shaped cover glass to which a coating having an
`effect of a filter, such as an infrared-ray cut filter and an ND
`filter, has been applied, or a material having the same effect
`may be used as the optical member CG.
`Alternatively, an effect similar to the optical member CG 65
`may be given to the fifth lens L5 or the like by applying a
`coating to the fifth lens L5 or the like without using the optical
`
`6
`member CG. Thereby, it is possible to reduce the number of
`components, and to reduce the total length.
`Further, it is desirable that the imaging lens L includes an
`aperture stop St disposed on the object side of an object side
`surface of the second lens L2. Since the aperture stop St is
`disposed on the object side of the object side surface of the
`second lens L2 in such a manner, especially in a peripheral
`portion of an imaging area, it is possible to prevent an angle of
`incidence of rays, which pass through the optical system and
`10 are incident onto an imaging surface (imaging device), from
`becoming large. In order to further enhance this effect, it is
`more desirable that the aperture stop St be disposed on the
`object side of an object side surface of the first lens L1. Here,
`the expression "disposed on the object side of the object side
`15 surface of the second lens L2" means that the position of the
`aperture stop in the optical axis direction is the same as an
`intersection point between an on-axis marginal ray and the
`object side surface of the second lens L2 or located on the
`object side of the intersection point. Likewise, the expression
`20 "disposed on the object side of an object side surface of the
`first lens Ll" means that the position of the aperture stop in
`the optical axis direction is the same as an intersection point
`between an on-axis marginal ray and the object side surface of
`the first lens Ll or located on the object side of the intersec-
`25 tion point.
`In the embodiments of the present invention, the imaging
`lenses of the third and sixth configuration examples (refer to
`FIGS. 3 and 6) are configuration examples in which the aper(cid:173)
`ture stop St is disposed on the object side of the object side
`30 surface of the first lens Ll, and the imaging lenses of the first,
`second, fourth and fifth configuration examples (refer to
`FIGS. 1, 2, 4 and 5) are configuration examples in which the
`aperture stop St is disposed on the object side of the object
`side surface of the second lens L2. It should be noted that the
`aperture stop St shown herein does not necessarily represent
`the size or shape thereof but shows the position thereof on the
`optical axis ZL
`When the aperture stop St is disposed on the object side of
`the object side surface of the second lens L2, a flare stop for
`suppressing a flare component or a ghost component may be
`further provided on the object side of the object side surface
`of the first lens LL In the embodiments of the present inven(cid:173)
`tion, lenses as first and second configuration examples (FIGS.
`1 and 2) are configuration examples in which the flare stop is
`provided. It should be noted that, in FIGS. 1 and 2, the flare
`stop is referenced by the reference sign Stl, and the aperture
`stop is referenced by the reference sign St2. In this case, the
`aperture stop St2 is a stop that restricts an F-number, and the
`flare stop Stl is a stop that restricts rays at peripheral angles of
`view.
`Furthermore, when the aperture stop St is disposed on the
`object side of the object side surface of the first lens L1 in the
`optical axis, it is desirable that the aperture stop St be dis(cid:173)
`posed on the image side of a vertex of the surface of the first
`lens LL When the aperture stop St is disposed on the image
`side of the vertex of the surface of the first lens Ll in such a
`manner, it is possible to reduce the total length of the imaging
`lens including the aperture stop St. In the above-mentioned
`embodiments, the aperture stop St is disposed on the image
`side of the vertex of the surface of the first lens LL However,
`the invention is not limited to the embodiments, and the
`aperture stop St may be disposed on the object side of the
`vertex of the surface of the first lens LL The arrangement, in
`which the aperture stop St is disposed on the object side of the
`vertex of the surface of the first lens Ll, is slightly disadvan(cid:173)
`tageous in terms of securing a peripheral light amount, com-
`pared with a case where the aperture stop St is disposed on the
`
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`US 9, 128,267 B2
`
`7
`image side of the vertex of the surface of the first lens Ll.
`However, the arrangement can prevent an angle of incidence
`of rays, which pass through the optical system and are inci(cid:173)
`dent onto the imaging surface (imaging device), from becom(cid:173)
`ing large in the peripheral portion of the imaging area in a
`more desirable manner.
`As in the imaging lenses according to the first, second,
`fourth and fifth embodiments showninFIGS.1, 2, 4 and5, the
`aperture stop St (St2) may be disposed between the first lens
`Ll and the second lens L2 in the optical axis direction. In this
`case, it is possible to satisfactorily correct a curvature of field.
`When the aperture stop St is disposed between the first lens
`Ll and the second lens L2 in the optical axis direction, as
`compared with a case where the aperture stop St is disposed
`on the object side of the object side surface of the first lens L1
`in the optical axis direction, this arrangement is disadvanta(cid:173)
`geous in securing telecentricity, that is, making the principal
`rays parallel to such an extent that the principal rays are
`regarded as the optical axis (setting an incident angle thereof
`on the imaging surface such that the angle is approximate to 20
`zero). Thus, by applying an imaging device which is recently
`implemented as the development in the imaging device tech(cid:173)
`nology advances and in which deterioration in the light
`receiving efficiency and occurrence of color mixture due to
`increase of incident angle are more reduced than in the con- 25
`ventional imaging device, it is possible to achieve optimum
`optical performance.
`In the imaging lens L, the first lens Ll has a positive
`refractive power in the vicinity of the optical axis, and has a
`meniscus shape which is convex toward the object side in the 30
`vicinity of the optical axis. As shown in the embodiments, by
`making the first lens Ll, which is a lens closest to the object,
`have a positive refractive power and have a meniscus shape
`which is convex toward the object side in the vicinity of the
`optical axis, the position of the rear side principal point of the 35
`first lens Ll can be set to be close to the object, and thus it is
`possible to appropriately reduce the total length.
`The second lens L2 has a biconcave shape in the vicinity of
`the optical axis. Thereby, it is possible to appropriately sup(cid:173)
`press occurrence of a high-order spherical aberration while 40
`satisfa