`

`

`

`0--, = = N
`_."-0 = "-0
`d r.,;_
`
`00
`_.--..l
`
`3
`
`0 ....
`N
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`1,0
`
`Distortion rate ( % )
`2
`
`1
`
`0
`
`-1
`
`FIG.2
`
`-2
`
`-3
`
`0.2
`
`0.1
`
`0
`
`-0.1
`
`-0.2
`
`Focus offset (mm)
`
`0 ....
`N
`J·
`~
`~
`
`Ul
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`Distortion aberration
`
`ST
`
`Astigmatism aberration
`
` Ex. 1003
`Page 3
`
`HP,
`
`

`

`U.S. Patent
`
`Aug. 4, 2015
`
`Sheet 3 of 9
`
`US 9,097,860 B2
`
`Spherical aberration
`
`-0.02
`
`0.01
`-0.01
`0
`Focus offset (mm)
`
`0.02
`
`FIG.3
`
` Ex. 1003
`Page 4
`
`HP,
`
`

`

`

`

`0--, = = N
`\0 = \0
`d r.,;_
`
`00
`-....l
`
`3
`
`Distortion rate ( % )
`2
`
`0
`
`-1
`
`FIG.5
`
`-2
`
`-3
`
`0.2
`
`Focus offset (n1m)
`0.1
`
`0
`
`-0.1
`
`-0.2
`
`0 ....
`Ul
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`1,0
`
`0 ....
`~ ...
`~
`~
`
`N
`
`Ul
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`Distortion aberration
`
`ST
`
`Astigmatism aberration
`
` Ex. 1003
`Page 6
`
`HP,
`
`

`

`U.S. Patent
`
`Aug. 4, 2015
`
`Sheet 6 of 9
`
`US 9,097,860 B2
`
`Spherical aberration
`
`-0.02
`
`-0.01
`0
`Focus offset (mm)
`
`0.01
`
`0.02
`
`FIG.6
`
` Ex. 1003
`Page 7
`
`HP,
`
`

`

`

`

`

`

`U.S. Patent
`
`Aug. 4, 2015
`
`Sheet 9 of 9
`
`US 9,097,860 B2
`
`Spherical aberration
`
`-0.02
`
`-0.01
`
`0
`
`0.01
`
`0.02
`
`Focus offset (mm)
`
`FIG.9
`
` Ex. 1003
`Page 10
`
`HP,
`
`

`

`US 9,097,860 B2
`
`1
`LENS ASSEMBLY
`
`CROSS-REFERENCE TO RELATED
`APPLICATION
`
`This application claims priority of Taiwanese Application
`No. 102131525, filed on Sep. 2, 2013.
`
`BACKGROUND OF THE INVENTION
`
`2
`face which faces the object side, and a peripheral surface
`which interconnects the object-side surface and the image(cid:173)
`side surface. Each of the object-side surface and the image(cid:173)
`side surface of the fourth lens is an aspherical surface. At least
`5 one of the object-side surface and the image-side surface of
`the fourth lens has an inflection point located between the
`optical axis and the peripheral surface. The non-adjustable
`diaphragm is located between the object side and the second
`lens of the lens set. The lens assembly satisfies
`
`10
`
`15<HFOV/f<50,
`
`in which, HFOV represents one half of a maximum angle of
`view of the lens assembly and has a unit of degree, and f
`15 represents a focal length of the lens assembly and has a unit of
`millimeter.
`
`1. Field of the Invention
`The present invention relates to a lens assembly, more
`particularly to a compact wide-angle four-piece imaging lens
`assembly.
`2. Description of the Related Art
`A conventional imaging lens assembly is frequently
`adopted in an electronic product, such as a mobile phone, a
`smart phone, a tablet computer, a notebook computer, a cam(cid:173)
`era and so forth. With the continuous improvement of elec(cid:173)
`tronic products, a tendency toward compact design while 20
`maintaining high performance of the electronic products is
`desired. Accordingly, an imaging lens assembly is also devel(cid:173)
`oped toward a trend of being compact and having thin dimen(cid:173)
`sions. Meanwhile, for the purpose of raising resolving power,
`an imaging lens assembly is required to progress to have a 25
`wider angle of view.
`Even though conventional imaging lens assemblies, such
`as the optical lens assemblies disclosed in Taiwanese Patent
`Application Publication Numbers 201215941, 201224568
`and 201239443, are provided with four-piece lens frame- 30
`works, these imaging lens assemblies may not further satisfy
`a desire for compact design and a wider angle of view.
`Accordingly, in order to enable an electronic device to
`achieve effects ofboth compact design and high performance,
`a wide-angle imaging lens assembly capable of improving 35
`resolving power thereof and having miniature dimensions is
`desired on the market.
`
`SUMMARY OF THE INVENTION
`
`40
`
`Therefore, an object of the present invention is to provide a
`four-piece imaging lens assembly which has compact and
`thin dimensions and which has a wider angle of view for
`improving resolving power thereof.
`Accordingly, a lens assembly of the present invention com- 45
`prises a lens set and a non-adjustable diaphragm. The lens set
`includes a first lens, a second lens, a third lens and a fourth
`lens arranged in sequence from an object side to an image side
`along an optical axis of the lens assembly. The first lens has a
`positive optical power adjacent to the optical axis, and has a 50
`convex object-side surface which faces the object side, and an
`image-side surface which faces the image side. At least one of
`the object-side surface and the image-side surface of the first
`lens is an aspherical surface. The second lens has a positive
`optical power adjacent to the optical axis, and has a convex 55
`image-side surface which faces the image side, and an object(cid:173)
`side surface which faces the object side. At least one of the
`object-side surface and the image-side surface of the second
`lens is an aspherical surface. The third lens has a negative
`optical power adjacent to the optical axis, and has a concave 60
`object-side surface which faces the object side, and a convex
`image-side surface which faces the image side. At least one of
`the object-side surface and the image-side surface of the third
`lens is an aspherical surface. The fourth lens has a positive
`optical power adjacent to the optical axis, and has an image- 65
`side surface which faces the image side and which has a
`concave portion around the optical axis, an object-side sur-
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`Other features and advantages of the present invention will
`become apparent in the following detailed description of the
`three preferred embodiments with reference to the accompa(cid:173)
`nying drawings, of which:
`FIG. 1 is a schematic diagram illustrating a first preferred
`embodiment of a lens assembly according to the present
`invention;
`FIG. 2 illustrates simulation results of astigmatism aberra(cid:173)
`tion and distortion aberration of the first preferred embodi(cid:173)
`ment;
`FIG. 3 illustrates simulation result of spherical aberration
`of the first preferred embodiment;
`FIG. 4 is a schematic diagram illustrating a second pre(cid:173)
`ferred embodiment of a lens assembly according to the
`present invention;
`FIG. 5 illustrates simulation results of astigmatism aberra(cid:173)
`tion and distortion aberration of the second preferred embodi(cid:173)
`ment;
`FIG. 6 illustrates simulation result of spherical aberration
`of the second preferred embodiment;
`FIG. 7 is a schematic diagram illustrating a third preferred
`embodiment of a lens assembly according to the present
`invention;
`FIG. 8 illustrates simulation results of astigmatism aberra(cid:173)
`tion and distortion aberration of the third preferred embodi(cid:173)
`ment; and
`FIG. 9 illustrates simulation result of spherical aberration
`of the third preferred embodiment.
`
`DETAILED DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`Referring to FIG. 1, a first preferred embodiment of a lens
`assembly, according to the present invention, comprises a
`lens set 1, a non-adjustable diaphragm 2, and a filter lens 3.
`The lens set 1 includes a first lens 11, a second lens 12, a
`third lens 13 and a fourth lens 14 arranged in sequence from
`an object side to an image side along an optical axis L of the
`lens assembly. The first lens 11 has a positive optical power
`adjacent to the optical axis L, and has a convex object-side
`surface 111 which faces the object side, and an image-side
`surface 112 which faces the image side. At least one of the
`object-side surface 111 and the image-side surface 112 of the
`first lens 11 is an aspherical surface. The second lens 12 has a
`positive optical power adjacent to the optical axis L, and has
`a convex image-side surface 121 which faces the image side,
`and an object-side surface 122 which faces the object side. At
`least one of the object-side surface 121 and the image-side
`
` Ex. 1003
`Page 11
`
`HP,
`
`

`

`US 9,097,860 B2
`
`4
`
`Nd3>1.56,
`
`V3<29,
`
`Nd2<1.56,
`
`V2>29,
`
`(7)
`
`(8)
`
`(9)
`
`(10)
`
`5
`
`3
`surface 122 of the second lens 12 is an aspherical surface. The
`third lens 13 has a negative optical power adjacent to the
`optical axis L, and has a concave object-side surface 131
`which faces the object side, and a convex image-side surface
`132 which faces the image side.At least one of the object-side
`surface 131 and the image-side surface 132 of the third lens
`13 is an aspherical surface. The fourth lens 14 has a positive
`optical power adjacent to the optical axis L, and has an image(cid:173)
`side surface 141 which faces the image side and which has a
`concave portion around the optical axis L, an object-side 10
`surface 142 which faces the object side, and a peripheral
`surface 143 which interconnects the object-side surface 141
`and the image-side surface 142. Each of the object-side sur(cid:173)
`face 141 and the image-side surface 142 of the fourth lens 14
`is an aspherical surface. At least one of the object-side surface 15
`141 and the image-side surface 142 of the fourth lens 14 has
`an inflection point located between the optical axis L and the
`peripheral surface 143.
`The non-adjustable diaphragm 2 is located between the
`object side and the second lens 12 of the lens set 1.
`The lens assembly satisfies the following conditions:
`
`in which, Nd3 is a refractive index of the third lens 13 for light
`with a wavelength equal to 587 nanometers, V3 is a coeffi(cid:173)
`cient of dispersion of the third lens 13 for light with a wave(cid:173)
`length equal to 587 nanometers, Nd2 is a refractive index of
`the second lens 12 for light with a wavelength equal to 587
`nanometers, and V2 is a coefficient of dispersion of the sec(cid:173)
`ond lens 12 for light with a wavelength equal to 587 nanom-
`eters. Conditions (7) to (10) explicate that an absolute value of
`the optical power of the third lens 13 is greater than an
`absolute value of the optical power of the second lens 12 of
`the present invention.
`Moreover, the aspherical surfaces of the lens assembly of
`20 the present invention satisfy:
`
`15<HFOV/f<50,
`
`0.8<[/7}31<2.5,
`
`0.3<ctllct2<2.0, and
`
`0<ct3/ct4<1.0,
`
`(1)
`
`(2)
`
`(3)
`
`(4)
`
`in which, HFOV represents one half of a maximum angle of
`view of the lens assembly and has a unit of degree, f represents
`a focal length of the lens assembly and has a unit of millime(cid:173)
`ter, f3 is a focal length of the third lens 13 and has a unit of
`millimeter, ctl represents a center thickness of the first lens
`11, ct2 represents a center thickness of the second lens 12, ct3
`represents a center thickness of the third lens 13, ct4 repre(cid:173)
`sents a center thickness of the forth lens 14, and each of ctl,
`ct2, ct3 and ct4 has a unit of millimeter.
`Preferably, the lens assembly of the present invention fur(cid:173)
`ther satisfies the following conditions:
`
`HFOV>35°, and
`
`f<2.7mm.
`
`(5)
`
`(6)
`
`The condition (1) explicates that a higher value of HFOV
`represents a wider angle of view of the lens assembly of the
`present invention so as to increase the resolving power
`thereof, while a lower value of the focal length f enables a
`more compact lens assembly. Conditions (5) and (6) further
`explicate advantages of the wider angle of view and the com(cid:173)
`pact and thin dimensions of the lens assembly of the present
`invention.
`It is noted that the lens assembly of the present invention
`further satisfies the following conditions:
`
`ch2
`z = - - - - - -~ + Ah4 + Bh6 +
`1 + [1 - (k + 1Jc2h2]°5
`
`25
`
`Ch8 + Dh 10 + Eh12 + Fh 14 + Gh16 + Hh18 + Jh20 + ...
`
`in which, z is a displacement, along the optical axis L, of the
`aspherical surface from a vertex of the aspherical surface at a
`30 distance h from the optical axis L, c is a reciprocal of the
`radius of curvature, k is the conic constant, and A, B, C, D, E,
`F, G, H, J and so forth are aspheric coefficients. Surface
`profiles of the aspherical surfaces are able to correct aberra(cid:173)
`tions, reduce tolerance sensitivity and provide a wide-angle
`35 capability.
`
`First Preferred Embodiment
`
`Referring to FIG. 1 to FIG. 3, parameters of the first pre-
`40 ferred embodiment of the lens assembly are summarized as
`follows: f1=2.19 mm f2=2.05 mm, f3=-1.16 mm, f4=1.52
`mm, f=l.60 mm, ctl=0.284 mm, ct2=0.368 mm, ct3=0.190
`mm, ct4=0.472 mm, HFOV=44°.
`The first preferred embodiment of the lens assembly satis-
`45 fies condition (1) to condition (11), where: HFOV/f=27.5,
`lf/f31=1.38,
`ctl/ct2=0.77,
`ct3/ct4=0.40, Nd2=1.535,
`Nd3=1.636, V2=56.07, V3=23.89.
`FIG. 2 illustrates astigmatism aberration and distortion
`aberration of the first preferred embodiment. FIG. 3 illus-
`50 trates spherical aberration of the first preferred embodiment.
`Table 1 below shows the parameters of components of the first
`preferred embodiment, in which the filter lens 3 has anobject(cid:173)
`side surface 31 and an image-side surface 32.
`
`TABLE I
`
`First preferred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`curvature
`Interspace
`index
`
`Abbe number
`
`Focal
`length (mm)
`
`Non-adjustable
`diaphragm 2
`Object-side
`First
`lens 11
`surface 111
`Image-side
`surface 112
`
`00
`
`-0.03
`
`1.361
`
`0.284
`
`1.535
`
`56.07
`
`2.19
`
`-8.119
`
`0.194
`
` Ex. 1003
`Page 12
`
`HP,
`
`

`

`US 9,097,860 B2
`
`6
`
`5
`TABLE I-continued
`
`First 12referred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`index
`curvature
`Interspace
`
`Abbe number
`
`Focal
`length (mm)
`
`Third
`lens 13
`
`Second Object-side
`lens 12
`surface 121
`Image-side
`surface 122
`Object-side
`surface 131
`Image-side
`surface 132
`Fourth Object-side
`lens 14
`surface 141
`Image-side
`surface 142
`Object-side
`surface 31
`Image-side
`surface 32
`
`Filter
`lens 3
`
`-2.042
`
`0.368
`
`1.535
`
`56.07
`
`2.05
`
`-0.760
`
`0.159
`
`-0.289
`
`0.190
`
`1.636
`
`23.89
`
`-1.16
`
`-0.596
`
`0.038
`
`0.488
`
`0.472
`
`1.535
`
`56.07
`
`1.52
`
`0.805
`
`0.25
`
`00
`
`00
`
`0.21
`
`1.517
`
`64.17
`
`0.332
`
`Coefficients for the aspherical surfaces of the first preferred
`embodiment are provided in Table 2 below.
`
`TABLE2
`
`First lens 11
`
`Second lens 12
`
`Object-side
`surface 111
`
`Image-side
`surface 112
`
`Obj eel-side
`surface 121
`
`Image-side
`surface 122
`
`0
`-0.2065838
`-3.3390093
`45.617387
`-568.5172
`3836.6411
`-14300.609
`22470.012
`
`0
`-0.7720604
`1.4937038
`-48.87327
`417.56966
`-1866.3668
`3693.0414
`-1072.5651
`
`6.191788
`-1.4905075
`13.548352
`-222.85883
`1762.543
`-7503.2608
`17228.893
`-16174.808
`
`-3.784132
`-1.1446487
`-13.499105
`142.67618
`-811.19607
`2964.6502
`-6161.6996
`5342.7346
`
`Third lens 13
`
`Fourth lens 14
`
`Object-side
`surface 131
`
`Image-side
`surface 132
`
`Obj eel-side
`surface 141
`
`Image-side
`surface 142
`
`-3.838175
`-4.9202522
`18.914991
`-20.771041
`12.125511
`-142.85927
`243.02698
`30.761799
`
`-1.077898
`-0.5217609
`0.96784978
`12.065814
`-36.497597
`22.957229
`33.940443
`-33.635537
`
`-7.06691
`0.10412867
`-1.6835431
`4.2811759
`-6.3438122
`5.6351203
`-2.7711759
`0.58039414
`
`-2.241616
`-0.3678477
`0.10715581
`0.31062561
`-0.5323217
`0.37789525
`-0.1331061
`0.018683511
`
`k
`A
`B
`C
`D
`E
`F
`G
`
`k
`A
`B
`C
`D
`E
`F
`G
`
`Second Preferred Embodiment
`
`Referring to FIG. 4 to FIG. 6, parameters of a second
`preferred embodiment of the lens assembly, according to the
`present invention, are summarized as follows: fl =2.39 mm,
`f2=2.08 mm, f3=-1.45 mm, f4=1.85 mm, f=l.60 mm,
`ctl =0.276 mm, ct2=0.392 mm, ct3=0.204 mm, ct4=0.450
`mm, HFOV=44°, and are further tabulated in Table 3.
`
`50
`
`The second preferred embodiment of the lens assembly
`satisfies condition (1) to condition (11), where: HFOV/
`f=27.5, lf/f31=1.10, ctl/ct2=0.70, ct3/ct4=0.45, Nd2=1.535,
`Nd3=1.636, V2=56.07, V3=23.89.
`FIG. 5 illustrates astigmatism aberration and distortion
`55 aberration of the second preferred embodiment. FIG. 6 illus(cid:173)
`trates spherical aberration of the second preferred embodi(cid:173)
`ment.
`
`TABLE3
`
`Second preferred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`curvature
`Interspace
`index
`
`Abbe number
`
`Focal
`length (mm)
`
`First
`lens 11
`
`Object-side
`surface 111
`
`1.172
`
`0.276
`
`1.535
`
`56.07
`
`2.39
`
` Ex. 1003
`Page 13
`
`HP,
`
`

`

`US 9,097,860 B2
`
`8
`
`7
`TABLE 3-continued
`
`Second 12referred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`curvature
`Interspace
`index
`
`Abbe number
`
`Focal
`length (mm)
`
`Third
`lens 13
`
`Image-side
`surface 112
`Non-adjustable
`diaphragm 2
`Second Object-side
`lens 12
`surface 121
`Image-side
`surface 122
`Object-side
`surface 131
`Image-side
`surface 132
`Fourth Object-side
`lens 14
`surface 141
`Image-side
`surface 142
`Object-side
`surface 31
`Image-side
`surface 32
`
`Filter
`lens 3
`
`12.524
`
`0.002
`
`00
`
`0.193
`
`-2.352
`
`0.392
`
`1.535
`
`56.07
`
`2.08
`
`-0.800
`
`0.165
`
`-0.295
`
`0.204
`
`1.636
`
`23.89
`
`-1.45
`
`-0.550
`
`0.022
`
`0.526
`
`0.450
`
`1.535
`
`56.07
`
`1.85
`
`0.786
`
`0.25
`
`00
`
`00
`
`0.21
`
`1.517
`
`64.17
`
`0.352
`
`Coefficients for the aspherical surfaces of the second pre- 25
`ferred embodiment are provided in the following Table 4.
`
`TABLE4
`
`B
`C
`D
`E
`_ _ _ _ S_e_co_n_d_l_en_s_1_2 _ _ _ _ 30 F
`G
`
`First lens 11
`
`Object-side
`surface 111
`
`Image-side
`surface 112
`
`Object-side
`surface 121
`
`TABLE 4-continued
`
`9.3522783
`-14.277191
`58.628841
`13.198369
`-631.1631
`956.17439
`
`-3.5402459
`22.786238
`-34.875393
`-6.5038799
`60.790568
`-37.919506
`
`-1.3786241
`3.9107049
`-6.1155891
`5.4923776
`-2.6266688
`0.51902791
`
`-0.21216838
`0.6311134
`-0.74118053
`0.45196807
`-0.14266076
`0.01825282
`
`Image-side
`surface 122
`
`k
`A
`B
`C
`D
`E
`F
`G
`
`k
`A
`
`-27.67006
`1.9885098
`-16.754161
`121.87784
`-697.96568
`2523.3236
`-5159.4588
`4272.9124
`
`0
`-0.37701082
`-0.49422655
`-25.697915
`372.82808
`-3090.4143
`12641.669
`-20091.048
`
`0
`-0.96274237
`2.5787486
`-75.20593
`563.02784
`-2537.022
`4107.643
`1821.596
`
`-0.1133277
`-0.00025411
`-13.638266
`119.14826
`-775.83633
`3121.5568
`-6765.6192
`6044.1686
`
`35
`
`40
`
`Third lens 13
`
`Fourth lens 14
`
`Object-side
`Surface 131
`
`Image-side
`surface 132
`
`Object-side
`Surface 141
`
`Image-side
`surface 142
`
`-3.670904
`-3.9824733
`
`-1.681659
`-0.37652375
`
`-7.045281
`0.000309204
`
`-3.872049
`-0.15744128
`
`45
`
`Third Preferred Embodiment
`
`Referring to FIG. 7 to FIG. 9, parameters of a third pre(cid:173)
`ferred embodiment of the lens assembly, according to the
`present invention, are summarized as follows: fl =2.55 mm,
`f2=0.86 mm, f3=-0.61 mm, f4=0.98 mm, f=l.13 mm,
`ctl=0.239 mm, ct2=0.266 mm, ct3=0.187 mm, ct4=0.429
`mm, HFOV=44°, and are further tabulated in Table 5.
`The third preferred embodiment of the lens assembly sat(cid:173)
`isfies condition (1) to condition (11), where: HFOV/f=39.0,
`ctl/ct2=0.90,
`ct3/ct4=0.44, Nd2=1.535,
`lf/f31=1.85,
`Nd3=1.636, V2=56.07, V3=23.89.
`FIG. 8 illustrates astigmatism aberration and distortion
`aberration of the third preferred embodiment. FIG. 9 illus(cid:173)
`trates spherical aberration of the third preferred embodiment.
`
`TABLES
`
`Third preferred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`curvature
`Interspace
`index
`
`Abbe number
`
`Focal
`length (mm)
`
`Non-adjustable
`diaphragm 2
`Object-side
`First
`lens 11
`surface 111
`Image-side
`surface 112
`Second Object-side
`lens 12
`surface 121
`Image-side
`surface 122
`Object-side
`surface 131
`Image-side
`surface 132
`
`Third
`lens 13
`
`00
`
`-0.001
`
`1.903
`
`0.239
`
`1.535
`
`56.07
`
`2.55
`
`-4.616
`
`0.062
`
`3.029
`
`0.266
`
`1.535
`
`56.07
`
`0.86
`
`-0.528
`
`0.095
`
`-0.184
`
`0.187
`
`1.636
`
`23.89
`
`-0.61
`
`-0.483
`
`0.092
`
` Ex. 1003
`Page 14
`
`HP,
`
`

`

`US 9,097,860 B2
`
`10
`
`9
`TABLE 5-continued
`
`Third preferred embodiment
`
`Component/
`Surface
`
`Radius of Thickness/ Refractive
`curvature
`Interspace
`index
`
`Abbe number
`
`Focal
`length (mm)
`
`Fourth Object-side
`lens 14
`surface 141
`Image-side
`surface 142
`Object-side
`surface 31
`Image-side
`surface 32
`
`Filter
`lens 3
`
`0.430
`
`0.429
`
`1.535
`
`56.07
`
`0.98
`
`1.549
`
`0.125
`
`00
`
`00
`
`0.210
`
`1.517
`
`64.17
`
`0.325
`
`Coefficients for the aspherical surfaces of the third pre-
`ferred embodiment are provided in the following Table 6.
`
`15
`
`TABLE6
`
`First lens 11
`
`Second lens 12
`
`Object-side
`surface 111
`
`Image-side
`surface 112
`
`Object-side
`Surface 121
`
`Image-side
`surface 122
`
`k
`A
`B
`C
`D
`E
`F
`G
`
`k
`A
`B
`C
`D
`E
`F
`G
`
`8.58328
`-1.2031657
`12.223278
`-1918.3111
`6722.3948
`2123163.2
`-52922573
`3.7786e+008
`
`-2824.922
`-9.8439198
`116.10956
`-1775.4567
`-15124.178
`652775.39
`-5158083.1
`11596365
`
`42.97767
`-7.1130345
`4.0234552
`-507.43521
`-7707.7496
`80989.53
`1130631.4
`-8089358.7
`
`0.7395685
`0.63242517
`-132.3459
`2590.488
`-20847.637
`138170.7
`-1000249.5
`3411687.3
`
`Third lens 13
`
`Fourth lens 14
`
`Object-side
`Surface 131
`
`Image-side
`surface 132
`
`Object-side
`Surface 141
`
`Image-side
`surface 142
`
`-1.926854
`-4.0319876
`-130.00916
`3983.5728
`-22497.967
`-103474.15
`1277642.5
`-3002346
`
`-0.3569793
`-0.15762397
`8.7724173
`116.23539
`-218.09901
`-4855.6445
`24221.919
`-32489.178
`
`-5.810289
`-0.05755995
`-1.4813813
`9.9370396
`-60.63752
`190.69088
`-287.85565
`163.69987
`
`1.443596
`-0.20237191
`0.7721049
`-8.9338663
`26.574088
`-38.350854
`27.456949
`-8.006268
`
`45
`
`To sum up, the effects of the present invention may be
`summarized as follows:
`1. A feature of the present invention resides in that the lens
`assembly satisfies 15<HFOV/f<50. Moreover, the lens
`assembly also satisfies condition (1) to condition (11) so as to
`increase the resolving power of the lens assembly, increase
`angle of view thereof, and reduce a thickness thereof to 50
`achieve a compact design.
`2. A higher value ofHFOV of the lens assembly represents
`a wider angle of view of the lens assembly so as to increase the
`resolving power thereof.
`3. A lower value of the focal length f of the lens assembly
`enables smaller and thinner dimensions thereof.
`Therefore, the lens assembly of the present invention may
`have compact and thin dimensions while exhibiting high per(cid:173)
`formances.
`While the present invention has been described in connec(cid:173)
`tion with what are considered the most practical and preferred
`embodiments, it is understood that this invention is not lim(cid:173)
`ited to the disclosed embodiments but is intended to cover
`various arrangements included within the spirit and scope of 65
`the broadest interpretation so as to encompass all such modi(cid:173)
`fications and equivalent arrangements.
`
`55
`
`60
`
`What is claimed is:
`1. A lens assembly comprising:
`a lens set which includes a first lens, a second lens, a third
`lens and a fourth lens arranged in sequence from an
`object side to an image side along an optical axis of said
`lens assembly, wherein
`said first lens has a positive optical power adjacent to the
`optical axis, and has a convex object-side surface
`which faces the object side, and an image-side surface
`which faces the image side, at least one of said object(cid:173)
`side surface and said image-side surface of said first
`lens being an aspherical surface,
`said second lens has a positive optical power adjacent to
`the optical axis, and has a convex image-side surface
`which faces the image side, and a concave object-side
`surface which faces the object side, at least one of said
`object-side surface and said image-side surface of
`said second lens being an aspherical surface,
`said third lens has a negative optical power adjacent to
`the optical axis, and has a concave object-side surface
`which faces the object side, and a convex image-side
`surface which faces the image side, at least one of said
`object-side surface and said image-side surface of
`said third lens being an aspherical surface,
`
` Ex. 1003
`Page 15
`
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`
`

`

`US 9,097,860 B2
`
`11
`said fourth lens has a positive optical power adjacent to
`the optical axis, and has an image-side surface which
`faces the image side and which has a concave portion
`around the optical axis, an object-side surface which
`faces the object side, and a peripheral surface which 5
`interconnects said object-side surface and saidimage(cid:173)
`side surface, each of said object-side surface and said
`image-side surface of said fourth lens being an
`aspherical surface, at least one of said object-side
`surface and said image-side surface of said fourth lens 10
`having an inflection point located between the optical
`axis and said peripheral surface; and
`a non-adjustable diaphragm located between the object
`side and said second lens of said lens set;
`wherein said lens assembly satisfies
`
`12
`4. The lens assembly as claimed in claim 1, further satis(cid:173)
`fying:
`Nd3>1.56, and
`
`V3<29,
`
`in which, Nd3 is a refractive index of said third lens for light
`with a wavelength equal to 587 nanometers, and V3 is a
`coefficient of dispersion of said third lens for light with a
`wavelength equal to 587 nanometers.
`5. The lens assembly as claimed in claim 4, further satis(cid:173)
`fying:
`Nd2<1.56, and
`
`15<HFOV/f<50,
`
`in which, HFOV represents one half of a maximum angle of
`view of said lens assembly and has a unit of degree, and f
`represents a focal length of said lens assembly and has a unit
`of millimeter.
`2. The lens assembly as claimed in claim 1, further satis(cid:173)
`fying:
`
`HFOV>41°.
`
`3. The lens assembly as claimed in claim 1, further satis(cid:173)
`fying:
`
`/<2.7 mm,
`
`jlf4>0.54
`
`in which, f4 is a focal length of said fourth lens and has a unit
`of millimeter.
`
`V2>29,
`15 in which, Nd2 is a refractive index of said second lens for light
`with a wavelength equal to 587 nanometers, and V2 is a
`coefficient of dispersion of said second lens for light with a
`wavelength equal to 587 nanometers.
`6. The lens assembly as claimed in claim 1, further satis-
`20 fying:
`0.8<!flj31<2.5,
`
`in which, f3 is a focal length of said third lens and has a unit
`of millimeter.
`7. The lens assembly as claimed in claim 1, further satis-
`25 fying:
`0.67<ctl/ct2<2.0, and
`
`0<ct3/ct4<1.0,
`
`30
`
`in which, ctl represents a center thickness of said first lens,
`ct2 represents a center thickness of said second lens, ct3
`represents a center thickness of said third lens, ct4 rep(cid:173)
`resents a center thickness of said forth lens, and each of
`ctl, ct2, ct3 and ct4 has a unit of millimeter.
`* * * * *
`
` Ex. 1003
`Page 16
`
`HP,
`
`