I lllll llllllll Ill lllll lllll lllll lllll lllll 111111111111111111111111111111111
`US007777972B 1
`
`c12) United States Patent
`Chen et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,777,972 Bl
`Aug. 17, 2010
`
`(54)
`
`IMAGING OPTICAL LENS ASSEMBLY
`
`(75)
`
`Inventors: Chun-Shan Chen, Taichung (TW);
`Hsiang-Chi Tang, Taichung (TW)
`
`(73) Assignee: Largan Precision Co., Ltd., Taichung
`(TW)
`
`( *) 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.: 12/483,748
`
`(22) Filed:
`
`Jun.12,2009
`
`(30)
`
`Foreign Application Priority Data
`
`Feb. 19,2009
`
`(TW)
`
`.............................. 98105232 A
`
`(51)
`
`Int. Cl.
`G02B 9134
`(2006.01)
`G02B 13118
`(2006.01)
`(52) U.S. Cl. ........................ 3591773; 3591715; 359/740
`(58) Field of Classification Search ................. 359/715,
`359/738, 740, 773
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`7,477,459 B2 *
`1/2009 Liao ........................... 359/773
`7,492,532 B2 *
`212009 Shin ........................... 359/773
`2004/0136097 Al*
`7/2004 Park ........................... 359/773
`200710188890 Al *
`8/2007 Jo et al. ...................... 359/773
`
`1/2009 Teraoka et al. .............. 359/773
`1/2009 Taniyarna ................... 359/773
`8/2009 Shinohara ................... 359/773
`
`2009/0009889 Al*
`200910015944 Al*
`2009/0207507 Al*
`* cited by examiner
`Primary Examiner-Evelyn A. Lester
`(74) Attorney, Agent, or Firm-Birch, Stewart, Kolasch &
`Birch, LLP
`
`(57)
`
`ABSTRACT
`The present invention provides an imaging optical lens
`assembly including, in order from the object side to the image
`side: a first lens group comprising a first lens element with
`positive refractive power, no lens element with refractive
`power being disposed between the first lens element and an
`imaged object, the first lens element being the only lens
`element with refractive power in the first lens group; and a
`second lens group comprising, in order from the object side to
`the image side: a second lens element with negative refractive
`power; a third lens element; and a fourth lens element;
`wherein focusing adjustment is performed by moving the first
`lens element along an optical axis, such that as a distance
`between the imaged object and the imaging optical lens
`assembly changes from far to near, a distance between the
`first lens element and an image plane changes from near to
`far; and wherein the number of the lens elements with refrac(cid:173)
`tive power in the imaging optical lens assembly is N, and it
`satisfies the relation: 4~N~5. The abovementioned arrange(cid:173)
`ment of optical elements and focusing adjustment method
`enable the imaging optical lens assembly to obtain good
`image quality and consume less power.
`
`19 Claims, 16 Drawing Sheets
`
`131
`
`132
`
`150
`
`160 170
`
`Apple v. Corephotonics
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`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 1of16
`
`US 7,777,972 Bl
`
`130
`
`120
`
`140
`
`100
`
`110
`
`121
`
`131
`
`132
`
`150
`
`160 170
`
`Fig. 1
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`

`

`N = "'""
`
`-....l
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`1J1 =- ('D
`
`('D
`
`~ ....
`~
`
`N
`~......:i
`
`0 ....
`
`0
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`%DISTORTION
`
`FOCUS (MILLIMETERS)
`
`3. 0 0
`
`1. 5 0
`
`0. 0
`
`-l. 50
`
`-3. oo
`
`o. 200
`
`a. 100
`
`o. o
`
`o. 100 -o. 200 -o. ioo
`
`Fig.2A
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 0 50
`
`0.0
`
`-0. 100
`
`I
`
`I
`
`a. 11
`
`1. 42
`
`2. 13
`
`0. 71
`
`1. 42
`
`2. 13
`
`2. 83
`!MG HT
`
`DISTORT ION
`
`----------------486 .1000 NM
`------587 .6000 NM
`656.3000 NM
`
`2: 83
`!MG HT
`F 1 ELD CURVES.
`
`ASTIGMATIC
`
`/o. 2 5
`'
`
`I
`oj. 5 o
`'
`
`I Id 15
`
`/ ...... 00
`
`SPIIER I CAL ABER.
`
`LONGITUDINAL
`
`Object Distance=Infinity
`
`Apple v. Corephotonics
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`

`

`N = "'""
`
`-...l
`\c
`-...l
`-...l
`~
`-...l
`rJl
`d
`
`O'I
`....
`0 .....
`
`:.1. u
`
`(.H
`
`.....
`1J1 =(cid:173)
`
`('D
`('D
`
`~ ....
`~
`
`0 ....
`
`0
`
`N
`~-....J
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`I. \42
`
`. 13
`
`0. 71
`
`1. 42
`
`2. 13
`
`2. 84
`
`!MG HT
`
`DISTORTION
`
`----------------486. l 000 NM
`587.6000 NM
`656.3000 NM
`
`T
`
`BIG HT
`FIELD CURVES.
`
`ASTIGMATIC
`
`%DISTORTION
`I. 5
`
`0. 0
`
`-1. 5
`
`Fig.2B
`
`-3. 0
`
`0. 20
`
`FOCUS (MILLIMETERS)
`-0. 1 0
`
`0. I 0
`
`0. 0
`
`0.100 -0.20
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 05 (}
`
`0. 0
`
`-0. l 00
`
`b. 25
`
`b. 50
`
`.o.o
`
`\
`
`I
`I
`
`I
`I
`I
`I
`I
`\
`I
`\
`I
`I
`\
`\
`I
`\
`
`' I
`/,. ... -
`
`\
`
`SPHERICAL ABER.
`
`LOfiGITUDINAL
`
`Object Distance=lOOmm
`
`Apple v. Corephotonics
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 4of16
`
`US 7,777,972 Bl
`
`330
`
`320
`
`310
`
`340
`
`300
`
`331
`
`332
`350
`
`360
`
`Fig.3
`
`Apple v. Corephotonics
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`Page 5 of 23
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`

`

`N = "'""
`
`-....l
`\c
`-....l
`-....l
`~
`-....l
`rJl
`d
`
`O'I
`....
`0 .....
`Ul
`.....
`1J1 =- ('D
`
`('D
`
`~ ....
`~
`
`N
`~-....J
`
`0 ....
`
`0
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`%DISTORTION
`
`3. c 0
`
`1.50
`
`0.0
`
`-1.50
`
`-3. oo
`
`o. 200
`
`FOCUS (MILLIMETERS)
`-o. loo
`
`o. ioo
`
`o. o
`
`-o. 200
`
`o. ioo
`
`Fig.4A
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 050
`
`0. 0
`
`-0. 100
`
`I
`
`I
`
`I
`
`0. 71
`
`1. 42 \
`
`2. 13
`
`2. 84
`!MG HT
`
`DISTORTION
`
`----------------486.1000 NM
`587.6000 NM
`656.3000 NM
`
`a. 11
`
`1. 42
`
`j 0. 2 j
`
`j 0. 5 D
`
`0. 7 5
`
`I
`I
`I
`I
`I
`I
`
`!MG !IT
`FJELD CURVES.
`
`ASTIGMATIC
`
`.1 •... c o
`
`SP HER I CAL ABER.
`
`LONGITUDINAL
`
`Object Distance=Infinity
`
`Apple v. Corephotonics
`
`Page 6 of 23
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`Apple Ex. 1008
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`

`

`N = "'""
`
`-....l
`\c
`-....l
`-....l
`~
`-....l
`rJl
`d
`
`O'I
`....
`0 .....
`O'I
`.....
`1J1 =- ('D
`
`('D
`
`~ ....
`~
`
`0 ....
`
`0
`
`N
`~-....J
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`%DI ST ORT ION
`
`3. 0
`
`1.5
`
`0.0
`
`-1.5
`
`-3. 0
`
`0. 20
`
`I
`
`I
`
`0' 71
`
`\
`
`1. 42
`
`2. 84
`IMG HT
`
`DISTORTIO:.!
`
`----------------486.1000 NM
`587.6000 NM
`656.3000 NM
`
`Fig.4B
`
`FOCUS (MILLIMETERS)
`-0.10
`
`0.10
`
`0.0
`
`0.100 -0.20
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 050
`
`0. 0
`
`-0. 100
`
`2. 84
`!MG HT
`
`FI ELD CURVES.
`
`ASTIGMATIC
`
`SP HERT CAL A RER.
`
`LONGITUDTNAL
`
`Object Distance=lOOmm
`
`0. 71
`
`1. 4 2
`
`2. 13
`
`D. 25
`
`0. 5 0
`
`\+ 0. 75
`
`I
`I
`I
`I
`I
`\
`\
`I
`I
`/---,,..::r.: ... l. 0 0
`
`!
`I
`I
`I
`
`I \
`
`Apple v. Corephotonics
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`Page 7 of 23
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 7of16
`
`US 7,777,972 Bl
`
`530
`
`520
`
`510
`
`540
`
`500
`
`521
`
`Fig.5
`
`531
`
`532
`
`550
`
`560 570
`
`Apple v. Corephotonics
`
`Page 8 of 23
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`

`

`N = "'""
`
`--...l
`\C
`"'--...l
`--...l
`--...l
`"'--...l
`rJl
`d
`
`O'I
`....
`0 .....
`
`QO
`.....
`1J1 =(cid:173)
`
`('D
`('D
`
`~ ....
`~
`
`0 ....
`
`0
`
`N
`"'......:i
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`IMG ET
`
`DISTORTION
`
`486.1000 NM
`------587.6000 NM
`656.3000 NM
`
`!MG HT
`FIELD CURVES.
`
`ASTIGMATIC
`
`s
`
`,1,. o a
`
`SPHERICAL ABER.
`
`LONGITUDINAL
`
`Object Distance=Infinity
`
`%DISTORTION
`
`3. 00
`
`1.50
`
`0.0
`
`-l.50
`
`-3. 00
`
`0. 200
`
`FOCUS (MILLI~ETERS)
`-o. lOO
`
`a. lOO
`
`o. o
`
`o. ioo -o. 200
`
`Fig. 6A
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 050
`
`0. 0
`
`-0. 100
`
`0. 71
`
`1. 42
`
`}o
`
`~ o\ 5
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`
`I
`\
`I
`\
`'\
`
`Apple v. Corephotonics
`
`Page 9 of 23
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`Apple Ex. 1008
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`

`

`N = "'""
`
`-.....1
`\C
`"'-.....1
`-.....1
`-.....1
`"'-.....1
`rJl
`d
`
`%DISTORTION
`
`3. 0
`
`1.5
`
`0.0
`
`-l.5
`
`-3. 0
`
`0. 20
`
`Fig. 6B
`
`FOCUS (MILLIMETERS)
`-0.10
`
`0.10
`
`0.0
`
`-0. 20
`
`0. 100
`
`FOCUS (MILLIMETERS)
`-0. 050
`
`0. 0 50
`
`0. 0
`
`-0. 100
`
`....
`"° 0 .....
`.....
`1J1 =(cid:173)
`
`('D
`('D
`
`O'I
`
`~ ....
`~
`
`N
`"'......:i
`
`0 ....
`
`0
`
`~ = ~
`
`~
`~
`~
`•
`00
`~
`
`I. 42
`
`2. 13
`
`2. 13
`
`2. 81[
`
`JM[; HT
`
`DISTORTION
`
`----------------486. 1000 NM
`587.6000 NM
`656.3000 NM
`
`2. 84 T
`!MG HT
`FIELD CURVES.
`
`s
`
`ASTIGMATIC
`
`D. 25
`
`0)50
`
`. 75
`
`I. 0 0
`
`SP HER I CAL ABER.
`
`LONGITUDINAL
`
`Object Distance=lOOmm
`
`Apple v. Corephotonics
`
`Page 10 of 23
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`Apple Ex. 1008
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 10of16
`
`US 7,777,972 Bl
`
`TABLE I
`
`(Embodiment 1)
`
`f= 4.33 mm, Fno = 2.90, HFOV = 33.5 deg.
`
`Surface#
`
`Curvature Radius Thickness Material
`
`Index
`
`Abbe#
`
`Focal
`length
`
`0
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`Object
`
`Ape. Stop
`
`Plano
`
`Plano
`
`Infinity
`
`-0.089
`
`Lens 1
`
`2.16949 (ASP)
`
`-5.88250 (ASP)
`
`Lens2
`
`100.00000 (ASP)
`
`3.21670 (ASP)
`
`Lens 3
`
`-2.18540 (ASP)
`
`-1.04238 (ASP)
`
`Lens4
`
`2.90877 (ASP)
`
`0.96623 (ASP)
`
`IR-filter
`
`Cover Glass
`
`Image
`
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`0.900
`
`0.200
`
`0.383
`
`0.614
`
`0.766
`
`0.070
`
`0.581
`
`0.300
`
`0.200
`
`0.500
`
`0.300
`
`0.484
`
`Plastic
`
`1.544
`
`55.9
`
`3.03
`
`Plastic
`
`1.632
`
`23.4
`
`-5.27
`
`Plastic
`
`1.530
`
`55.8
`
`3.05
`
`Plastic
`
`1.530
`
`55.8
`
`-3.05
`
`Glass
`
`1.517
`
`64.2
`
`Glass
`
`1.517
`
`64.2
`
`*Object Distance 100 mm: surface 3 thickness = 0.287 mm, f= 4.23 mm
`
`Fig.7
`
`Apple v. Corephotonics
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`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 11of16
`
`US 7,777,972 Bl
`
`TABLE2
`
`Aspheric Coefficients
`
`Surface#
`
`2
`
`3
`
`4
`
`5
`
`k =
`A4=
`
`A6=
`
`A8=
`
`-6.42322E+OO 0.00000E+OO -l.OOOOOE+03 -l.63883E+O 1
`
`5.41140E-02
`
`-1. 09227E-02 6.0l 150E-02
`
`l.56920E-Ol
`
`- l. 9644 SE-02 -5.15556E-02 -1.82457£-01 -l.94068E-Ol
`
`-l.14833E-Ol 2.4934 7E-02 2.74168E-Ol
`
`2.2 l l 72E-O l
`
`AlO=
`
`7.09572£-01
`
`2.44208£-02
`
`-1.16446£-0 l -l .06404E-01
`
`Al2=
`
`-2.32230E+OO -4.66235E-02 -2.68287£-01 -4.40642£-02
`
`Al4=
`
`3 .54279E+OO
`
`-3 .82606E-04 4.12009E-O 1 8.18527E-02
`
`Al6=
`
`-2.03569E+OO
`
`-1.82905£-01 -2.86683E-02
`
`Surface#
`
`6
`
`7
`
`8
`
`9
`
`k =
`
`A4=
`
`A6=
`
`A8=
`
`-2.29304E+Ol -4.53794E+OO -3.30328E+OO -5.73407E+o0
`
`-l.16793E-01 -l.19883E-O 1 -2. l 8847E-O 1 -1.13293£-01
`
`l.94942E-O 1 3.58178E-02 7.07747E-02 4.13104E-02
`
`-3.69015E-01 3.08158E-03
`
`-4.89029E-03 -l .28908E-02
`
`AIO=
`
`2.56431E-01
`
`-2.21268£-02 -2.89861 E-03 2.95065E-03
`
`Al2=
`
`5.95191E-02
`
`1.13277£-02 3 .46094E-04
`
`-5.61966E-04
`
`A14=
`
`A16=
`
`-1.65957£-01 1.86502£-03
`
`l. 72668£-04 7.44048£-05
`
`6.38640£-02
`
`-9. 98190£-04 -3 .06196£-05 -4.89505£-06
`
`Fig.8
`
`Apple v. Corephotonics
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`Page 12 of 23
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`Apple Ex. 1008
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 12of16
`
`US 7,777,972 Bl
`
`TABLE3
`
`(Embodiment 2)
`
`f= 4.25 mm, Fno = 2.90, HFOV = 33.5 deg.
`
`Surface#
`
`Curvature Radius Thickness Material
`
`Index
`
`Abbe#
`
`Focal
`length
`
`0
`
`2
`
`3
`
`4
`
`5
`6
`7
`8
`
`9
`10
`
`11
`
`12
`
`13
`
`14
`
`Object
`
`Ape. Stop
`
`Plano
`
`Plano
`
`Infinity
`
`-0.102
`
`Lens 1
`
`1.89503 (ASP)
`
`Lens 2
`
`Lens 3
`
`Lens4
`
`IR-filter
`
`Cover Glass
`
`Image
`
`-9.59770 (ASP)
`
`-21.59870 (ASP)
`4.01330 (ASP)
`
`-3.30370 (ASP)
`-1.55897 (ASP)
`2.57806 (ASP)
`
`1.10343 (ASP)
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`0.900
`
`0.200
`
`0.346
`
`0.504
`
`0.761
`0.600
`
`0.350
`0.300
`0.200
`
`0.500
`
`0.300
`
`0.089
`
`Plastic
`
`1.544
`
`55.9
`
`2.99
`
`Plastic
`
`1.632
`
`23.4
`
`-5.33
`
`Plastic
`
`1.544
`
`55.9
`
`4.70
`
`Plastic
`
`1.530
`
`55.8
`
`-3.97
`
`Glass
`
`1.517
`
`64.2
`
`Glass
`
`1.517
`
`64.2
`
`*Object Distance 100 nun: surface 3 thickness= 0.283 mm, f= 4.36 nun
`
`Fig.9
`
`Apple v. Corephotonics
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`Page 13 of 23
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 13of16
`
`US 7,777,972 Bl
`
`TABLE4
`
`Aspheric Coefficients
`
`Surface#
`
`2
`
`3
`
`4
`
`5
`
`k =
`A4=
`
`A6=
`
`-3.87349E+OO O.OOOOOE+OO 1.25366E+02 -3.52526£+01
`6.3258 lE-02 5.09665E-03 8.43181E-02 1.78238£-01
`-4.00870E-02 -4.18441E-02 -1.59342E-01 -L84920E-01
`
`A8=
`
`-5.03443£-02 3.35220£-02 2.35534E-Ol 2.13392E-Ol
`
`AIO=
`
`7.64212£-01
`
`-2.23277£-02 -l .18827E-O 1 -1.04308£-01
`
`-2.49182£-01 -4.03773£-02
`
`Al2=
`-2.58608£+00 8.22940£-03
`A14= 3.71028£+00 -2.02587£-02 4.34601E-01 8.43271£-02
`-2.09716£-01 -3. l 9236E-02
`
`Al6=
`
`-1.98186£+00
`
`Surface#
`
`6
`
`7
`
`8
`
`9
`
`k
`
`=
`
`-6.08404£+01 -3.51853E+OO -6.80667£+01 -7.60755E+OO
`
`A4=
`
`-1.90860£-01 -9.19376£-02 -2.22385£-01 -1.25750£-01
`
`A6=
`
`A8=
`
`AlO=
`A12 =
`
`Al4=
`
`2.58744£-01 2.04 732E-02 7.47643£-02 4.71329E-02
`
`-3.73925£-01 5.82878£-03 -4.26188£-03 -1.49248£-02
`-1.72439£-02 -3 .05 562£-03 3.37376£-03
`2.46479E-O1
`6. 78949£-02 1.26764£-02 2.69255£-04 -5.75776£-04
`-1.56664£-01 1.56195£-03 1.64291£-04 6.22629£-05
`
`A16=
`
`5.48830£-02 -l.71070E-03 -2.55825£-05 -3.47004£-06
`
`Fig.IO
`
`Apple v. Corephotonics
`
`Page 14 of 23
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`Apple Ex. 1008
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 14of16
`
`US 7,777,972 Bl
`
`TABLE 5
`
`(Embodiment 3)
`
`f= 4.23 mm, Fno = 2.90, HFOV = 33.5 deg.
`
`Surface#
`
`Curvature Radius Thickness Material
`
`Index
`
`Abbe#
`
`Focal
`length
`
`0
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`Object
`
`Ape. Stop
`
`Plano
`
`Plano
`
`Infinity
`
`-0.102
`
`Lens I
`
`1.83571 (ASP)
`
`Lens 2
`
`-9.26100 (ASP)
`
`-6.73390 (ASP)
`6.20280 (ASP)
`
`Lens 3
`
`-2.41850 (ASP)
`
`Lens 4
`
`IR-filter
`
`Cover Glass
`
`Image
`
`-1.12530 (ASP)
`
`1.90758 (ASP)
`0.85107 (ASP)
`
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`Plano
`
`0.900
`
`0.200
`
`0.311
`0.555
`
`0.736
`
`0.261
`
`0.320
`
`0.300
`
`0.200
`
`0.500
`
`0.300
`
`0.474
`
`Plastic
`
`1.544
`
`55.9
`
`2.90
`
`Plastic
`
`1.632
`
`23.4
`
`-5.06
`
`Plastic
`
`1.544
`
`55.9
`
`3.22
`
`Plastic
`
`1.544
`
`55.9
`
`-3.16
`
`Glass
`
`1.517
`
`64.2
`
`Glass
`
`l.517
`
`64.2
`
`*Object Distance 100 mm: surface 3 thickness= 0.278 mm, f= 4.35 mm
`
`Fig.11
`
`Apple v. Corephotonics
`
`Page 15 of 23
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`Apple Ex. 1008
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 15of16
`
`US 7,777,972 Bl
`
`TABLE6
`
`Aspheric Coefficients
`
`Surface#
`
`2
`
`3
`
`4
`
`5
`
`k =
`A4=
`
`A6=
`A8=
`
`-3.68354E+o0 4.27537E-01 -L18048E+02 -4.86168E+01
`
`6.60970E-02 4.25004E-03 8.4 l l35E-02
`
`l .87208E-O 1
`
`-3.9289 IE-02 -4.02627E-02 -l.61690E-O I -1.84789E-O1
`
`-5 .48599E-02 3.32827E-02 2.46696E-O 1 2.09987£-01
`
`AIO=
`
`7.67707E-01
`
`-2.18444£-02 -l .10007E-O I -l.00444E-01
`
`A12=
`
`-2.57677£+00 9.96757£-03
`
`-2.5 l 777E-01 -3.2931 lE-02
`
`A14= 3.69371£+00 -3.24649£-02 4. l 9955E-O 1 8.88264£-02
`
`Al6=
`
`-l .98154E+OO -3.55830E-04 -2. l 53 l 6E-Ol -4.33497E-02
`
`Surface#
`
`6
`
`7
`
`8
`
`9
`
`k =
`
`-3.22944E+Ol -3.25133£+00 -4.08630E+Ol -6.51806E+OO
`
`A4=
`
`-2.08072£-01 -9.36284E-02 -2.08003E-01 -l.43476E-01
`
`A6=
`A8=
`
`2.67223E-01 1.47155E-02 7.38545£-02 5.61405E-02
`
`-3.84575£-01 5.87603£-03
`
`-4.41204£-03 -1.67975£-02
`
`AlO=
`
`2.37336£-01
`
`-1.59335£-02 -3.0823 IE-03 3.32273E-03
`
`A12=
`
`6.76477£-02 1.30256E-02 2.62777E-04 -5.28673E-04
`
`Al4=
`
`-l.53505E-Ol
`
`l .56088E-03 1.63916£-04 6.68925E-05
`
`Al6=
`
`5.58447£-02 - l .82229E-03 -2.51552E-05 -5.25040E-06
`
`Fig.12
`
`Apple v. Corephotonics
`
`Page 16 of 23
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`Apple Ex. 1008
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`

`

`U.S. Patent
`
`Aug. 17, 2010
`
`Sheet 16of16
`
`US 7,777,972 Bl
`
`TABLE 7
`Embodiment Embodiment Embodiment
`I
`2
`3
`
`f
`
`Fno
`
`HFOV
`
`N
`
`fmax/finin
`
`IBFL1-BFL21
`(D l-D2)* 100/f
`VI
`V2
`f/fl
`f/f3
`
`T34/T23
`
`TTL/ImgH
`
`4.33
`
`2.90
`
`33.5
`
`4
`
`1.02
`0.0
`2.02
`
`55.9
`
`23.4
`
`1.43
`
`1.42
`
`0.11
`
`1.84
`
`4.25
`
`2.90
`
`33.5
`
`4
`l.03
`
`0.0
`
`1.98
`
`55.9
`
`23.4
`
`1.42
`
`0.90
`
`l.19
`
`1.75
`
`4.23
`
`2.90
`
`33.5
`
`4
`
`l.03
`
`0.0
`
`1.87
`
`55.9
`
`23.4
`
`1.46
`
`1.31
`
`0.47
`
`1.75
`
`Fig.13
`
`Apple v. Corephotonics
`
`Page 17 of 23
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`US 7,777,972 Bl
`
`1
`IMAGING OPTICAL LENS ASSEMBLY
`
`BACKGROUND OF THE INVENTION
`
`2
`second lens element with negative refractive power; a third
`lens element; and a fourth lens element; and wherein the
`method for performing focusing includes moving the first
`lens element along the optical axis, such that as a distance
`between the imaged object and the imaging optical lens
`assembly changes from far to near, a distance between the
`first lens element and the imaging surface changes from near
`to far, and during focusing the other lens elements in the
`imaging optical lens assembly can either move or not move
`10 relative to the imaging plane.
`The aforementioned arrangement oflens groups can effec(cid:173)
`tively improve the image quality of the imaging optical lens
`assembly. In the present imaging optical lens assembly, a
`single lens element, the first lens element, is selected to move
`15 along the optical axis to perform the focusing adjustment so
`that less power will be consumed during the focusing process.
`In addition, by selecting the first lens element to perform
`focusing adjustment, the number of lens groups can be
`reduced to effectively reduce the variability in the assembly/
`20 manufacturing of the imaging optical lens assembly.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`1. Field of the Invention
`The present invention relates to an imaging optical lens
`assembly, and more particularly, to an imaging optical lens
`assembly with focusing adjustment.
`2. Description of the Prior Art
`In recent years, with the popularity of camera mobile
`phones, the demand for compact photographing lenses is
`increasing, and the sensor of a general photographing camera
`is none other than CCD (charge coupled device) or CMOS
`device
`(Complementary Metal Oxide Semiconductor
`device). Furthermore, as advanced semiconductor manufac(cid:173)
`turing technology has allowed the pixel size of sensors to be
`reduced and compact photographing lenses have gradually
`evolved toward higher megapixels, there is an increasing
`demand for compact photographing lenses featuring better
`image quality.
`A conventional compact photographing lens equipped in a
`mobile phone is usually a single focus lens having a fixed
`focal length. For a specific object distance, since the photo(cid:173)
`graphing lens has a limited depth of field, it is apt to produce
`blurred images. Therefore, as the resolution of compact pho(cid:173)
`tographing lenses increases, a focusing adjustment function
`becomes more and more indispensable as well. Generally, a
`photographing lens with focusing adjustment function per(cid:173)
`forms focusing adjustment by using a driving motor to move
`the entire photographing lens relative to the sensor. However, 30
`such a photographing lens requires higher power consump(cid:173)
`tion because the driving motor is configured to drive the entire
`photographing lens. Moreover, the photographing lens has a
`relatively long total track length.
`
`FIG. 1 shows an imaging optical lens assembly in accor-
`25 dance with a first embodiment of the present invention.
`FIG. 2 shows the aberration curves of the first embodiment
`of the present invention.
`FIG. 3 shows an imaging optical lens assembly in accor(cid:173)
`dance with a second embodiment of the present invention.
`FIG. 4 shows the aberration curves of the second embodi(cid:173)
`ment of the present invention.
`FIG. 5 shows an imaging optical lens assembly in accor(cid:173)
`dance with a third embodiment of the present invention.
`FIG. 6 shows the aberration curves of the third embodiment
`35 of the present invention.
`FIG. 7 is TABLE 1 which lists the optical data of the first
`embodiment.
`FIG. 8 is TABLE 2 which lists the aspheric surface data of
`the first embodiment.
`FIG. 9 is TABLE 3 which lists the optical data of the second
`embodiment.
`FIG.10 is TABLE 4 which lists the aspheric surface data of
`the second embodiment.
`FIG.11 is TABLE 5 which lists the optical data of the third
`45 embodiment.
`FIG.12 is TABLE 6 which lists the aspheric surface data of
`the third embodiment.
`FIG. 13 is TABLE 7 which lists the data of the respective
`embodiments resulted from the equations.
`
`SUMMARY OF THE INVENTION
`
`The present invention provides an imaging optical lens
`assembly including, in order from the object side to the image
`side: a first lens group comprising a first lens element with 40
`positive refractive power, no lens element with refractive
`power being disposed between the first lens element and an
`imaged object, the first lens element being the only lens
`element with refractive power in the first lens group; and a
`second lens group comprising, in order from the object side to
`the image side: a second lens element with negative refractive
`power; a third lens element; and a fourth lens element; focus(cid:173)
`ing is performed by moving the first lens element along the
`optical axis, such that as a distance between the imaged object
`and the imaging optical lens assembly changes from far to 50
`near, a distance between the first lens element and the imaging
`surface changes from near to far, and during focusing the
`other lens elements in the imaging optical lens assembly do
`not move relative to the imaging plane; and wherein the
`number of the lens elements with refractive power in the 55
`imaging optical lens assembly is N, and it satisfies the rela(cid:173)
`tion: 4~N~5.
`According to one aspect of the present invention, there is
`provided a method for performing focusing for an imaging
`optical lens assembly; wherein the lens assembly includes, in
`order from the object side to the image side: a first lens group
`comprising a first lens element with positive refractive power,
`no lens element with refractive power being disposed
`between the first lens element and an imaged object, the first
`lens element being the only lens element with refractive
`power in the first lens group; and a second lens group com(cid:173)
`prising, in order from the object side to the image side: a
`
`DETAILED DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`The present invention provides an imaging optical lens
`assembly including, in order from the object side to the image
`side: a first lens group comprising a first lens element with
`positive refractive power, no lens element with refractive
`power being disposed between the first lens element and an
`imaged object, the first lens element being the only lens
`60 element with refractive power in the first lens group; and a
`second lens group comprising, in order from the object side to
`the image side: a second lens element with negative refractive
`power; a third lens element; and a fourth lens element;
`wherein focusing is performed by moving the first lens ele-
`65 ment along the optical axis, such that as a distance between
`the imaged object and the imaging optical lens assembly
`changes from far to near, a distance between the first lens
`
`Apple v. Corephotonics
`
`Page 18 of 23
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`

`US 7,777,972 Bl
`
`3
`element and the imaging surface changes from near to far; and
`wherein the number of the lens elements with refractive
`power in the imaging optical lens assembly is N, and it satis(cid:173)
`fies the relation: 4~N~5.
`When the relation ofN=5 is satisfied, the fifth lens element
`can be disposed between the first and second lens elements,
`the third and fourth lens elements, or the fourth lens element
`and the image plane.
`In the aforementioned imaging optical lens assembly, the
`focal length of the imaging optical lens assembly is f when the 10
`first lens element is positioned closest to the image plane, the
`focal length of the first lens element is fl, the focal length of
`the third lens element is f3, and they satisfy the relations:
`l.O<f/fl <1.7, 0.6<f/f3<1.8.
`When f/fl satisfies the above relation, the displacement 15
`distance of the first lens element will not be too large, thus the
`total track length (TTL) of the imaging optical lens assembly
`will not become too long. This also ensures that the move(cid:173)
`ment of the first lens element relative to the image plane has
`enough sensitivity required for focusing adjustment. By hav- 20
`ing the first lens element move along the optical axis to
`perform the focusing adjustment (the so-called internal
`focusing method), the total track length of the imaging optical
`lens assembly can be shortened effectively. TTL is defined as
`the on-axis spacing between the object-side surface of the first 25
`lens element and the image plane when the first lens element
`is positioned closest to the imaged object.
`The relation 0.6<f/f3<1.8 enables the third lens element to
`effectively distribute the refractive power of the optical sys(cid:173)
`tem, reducing the sensitivity of the optical system.
`In the aforementioned imaging optical lens assembly, the
`on-axis spacing between the image-side surface of the first
`lens element and the image plane is Dl when the first lens
`element is positioned closest to the imaged object, the on-axis
`spacing between the image-side surface of the first lens ele(cid:173)
`ment and the image plane is D2 when the first lens element is
`positioned closest to the image plane, the focal length of the
`imaging optical lens assembly is f when the first lens element
`is positioned closest to the image plane, and they satisfy the
`relation: l.O<(Dl-D2)*100/f<3.0.
`When the above relation is satisfied, the movement of the
`first lens element relative to the image plane has enough
`sensitivity required for focusing adjustment. The above rela(cid:173)
`tion also prevents the displacement distance of the first lens
`element from becoming too large.
`In the aforementioned imaging optical lens assembly, the
`on-axis spacing between the third lens element and the fourth
`lens element is T34, the on-axis spacing between the second
`lens element and the third lens element is T23, and they
`satisfy the relation: 0.2<T34/T23<1.6.
`When the above relation is satisfied, the off-axis aberration
`of the imaging optical lens assembly can be effectively cor(cid:173)
`rected. The above relation also prevents the back focal length
`from becoming too short and thus causing the rear end of the
`lens assembly to have insufficient space to accommodate
`mechanical components.
`In the aforementioned imaging optical lens assembly, the
`maximum focal length of the imaging optical lens assembly is
`fmax' the minimum focal length of the imaging optical lens
`assembly is fmim and they satisfy the relation: 1 ~fmaJ
`fmin~l.05.
`The above relation prevents the displacement distance of
`the first lens element from becoming too large and keeps the
`magnifying power of the optical system within a proper
`range.
`In the aforementioned imaging optical lens assembly, the
`back focal length of the imaging optical lens assembly is
`
`4
`BFLl when the first lens element is positioned closest to the
`imaged object, the back focal length of the imaging optical
`lens assembly is BFL2 when the first lens element is posi(cid:173)
`tioned closest to the image plane, and they satisfy the relation:
`IBFL1-BFL21<0.1 mm.
`Preferably, BFLl and BFL2 satisfy the relation: IBFL1-
`BFL21=0.
`When the above relation is satisfied, the image plane can be
`fixed and the number of moving elements can be reduced,
`thereby reducing the cost and the variability in the manufac(cid:173)
`turing of the lens assembly.
`In the aforementioned imaging optical lens assembly, it is
`preferable that the first lens element has a convex object-side
`surface so that the refractive power thereof can be enhanced to
`shorten the total track length of the imaging optical lens
`assembly.
`In the aforementioned imaging optical lens assembly, it is
`preferable that the fourth lens element has a concave image(cid:173)
`side surface.
`In the aforementioned imaging optical lens assembly, it is
`preferable that the second lens element has a concave image(cid:173)
`side surface and the third lens element has a concave object(cid:173)
`side surface and a convex image-side surface, so that accu(cid:173)
`mulation of aberrations can be avoided.
`In the present imaging optical lens assembly, the first lens
`element provides a positive refractive power, and the aperture
`stop is located near the object side of the imaging optical lens
`assembly, thereby the exit pupil of the imaging optical lens
`assembly can be positioned far away from the image plane.
`30 Therefore, the light will be projected onto the electronic
`sensor at a nearly perpendicular angle, and this is the telecen(cid:173)
`tric feature of the image side. The telecentric feature is very
`important to the photosensitive power of the current solid(cid:173)
`state electronic sensor as it can improve the photosensitivity
`35 of the electronic sensor to reduce the probability of the occur(cid:173)
`rence of shading.
`In addition, in optical systems with a wide field of view, the
`correction of distortion and chromatic aberration of magnifi(cid:173)
`cation is especially necessary, and the correction can be made
`40 by placing the aperture stop in a location where the refractive
`power of the optical system is balanced. In the present imag(cid:173)
`ing optical lens assembly, if the aperture stop is disposed
`between the first lens element and the imaged object, the
`telecentric feature will be enhanced to reduce the total track
`45 length of the optical system; if the aperture stop is disposed
`between the first lens element and the second lens element,
`the wide field of view is emphasized. Such an arrangement of
`the aperture stop also effectively reduces the sensitivity of the
`optical system.
`In the present imaging optical lens assembly, the lens ele-
`ments can be made of glass or plastic material. If the lens
`elements are made of glass, there is more flexibility in dis(cid:173)
`tributing the refractive power of the optical system. If plastic
`material is adopted to produce lens elements, the production
`55 cost will be reduced effectively. Additionally, the surfaces of
`the lens elements can be formed to be aspheric and made to be
`non-spherical easily, allowing more design parameter free(cid:173)
`dom which can be used to reduce aberrations and the number
`of the lens elements, so that the total track length of the
`60 imaging optical lens assembly can be shortened effectively.
`In the aforementioned imaging optical lens assembly, it is
`preferable that the third lens element has a positive refractive
`power so that the refractive power of the optical system can be
`distributed effectively.
`In the aforementioned imaging optical lens assembly, it is
`preferable that theAbbe number of the second lens element is
`V2, and it satisfies the relation: V2<29.
`
`50
`
`65
`
`Apple v. Corephotonics
`
`Page 19 of 23
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`

`US 7,777,972 Bl
`
`6
`a sensor cover glass 160 disposed between the IR filter 150
`and the image plane 170, the sensor cover glass 160 having no
`influence on the focal length of the imaging optical lens
`assembly; and
`an image plane 170 disposed behind the sensor cover glass
`160.
`Focusing is performed by moving the first lens element
`along the optical axis, such that as a distance between the
`imaged object and the imaging optical lens assembly changes
`from far to near, a distance between the first lens element and
`the imaging surface changes from near to far, and during
`focusing the other lens elements in the imaging optical lens
`assembly do not move relative to the imaging plane.
`The equation of the aspheric surface profiles is expressed
`as follows:
`
`X(Y) = (Y 2
`
`/ R) /(/+sqrt(! - (1 + k) * (Y / R)2
`
`)) + ~ (Ai)* (Y;)
`
`30
`
`5
`The above relation facilitates the correction of the chro(cid:173)
`matic aberration of the optical system.
`And it will be more preferable that V2 satisfies the relation:
`V2<25.
`In the aforementioned imaging optical lens assembly, it is
`preferable that the Abbe number of the first lens element is
`Vl, and it satisfies the relation: 50<Vl <62.
`The above relation facilitates the correction of the astig(cid:173)
`matism of the optical system.
`In the aforementioned imaging optical lens assembly, it is 10
`preferable that the second lens element has a concave object(cid:173)
`side surface.
`According to another aspect of the present invention, the
`aforementioned imaging optical lens assembly further com(cid:173)
`prises an electronic sensor on which an object is imaged. 15
`When the first lens element is positioned closest to the imaged
`object, the total track length of the imaging optical lens
`assembly is TTL, which is defined as the on-axis spacing
`between the object-side surface of the first lens element and
`the image plane when the first lens element is positioned 20
`closest to the imaged object, and the maximum image height
`of the imaging optical lens assembly is ImgH, which is
`defined as half of the diagonal length of the effective pixel
`area of the electronic sensor, and they satisfy the relation:
`TTL/ImgH<l.95.
`The above relation enables the imaging optical lens assem(cid:173)
`bly to maintain a compact form.
`Preferred embodiments of the present invention along with
`the appended drawings will be described in the following
`paragraphs.
`FIG. 1 shows an imaging optical lens assembly in accor(cid:173)
`dance with a first embodiment of the present invention, and
`FIG. 2 shows the aberration curves of the first embodiment of
`the present invention. The imaging optical lens assembly of
`the first embodiment of the present invention, which mainly 35
`comprises two lens groups, includes, in order from the object
`side to the image side:
`a first lens group comprising a plastic first lens element 100
`with positive refractive power having a conv