US00824.8715B2
`
`(12) United States Patent
`Asami et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8.248,715 B2
`Aug. 21, 2012
`
`(54) IMAGING LENS AND IMAGINGAPPARATUS
`USING MAGING LENS
`
`(75) Inventors: Taro Asami, Saitama (JP); Ryoko
`Otomo, Saitama (JP)
`(73) Assignee: Fujifilm Corporation, Tokyo (JP)
`
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 301 days.
`(21) Appl. No.: 12/635,014
`
`(22) Filed:
`
`Dec. 10, 2009
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2010/0142062 A1
`Jun. 10, 2010
`
`Foreign Application Priority Data
`
`Dec. 10, 2008 (JP) ............................... P2008-313893
`Dec. 1, 2009 (JP) ............................... P2009-273449
`
`(51) Int. Cl.
`(2006.01)
`GO2B 9/62
`(2006.01)
`GO2B I3/04
`(52) U.S. Cl. ........................................ 359/762: 359/752
`(58) Field of Classification Search .................. 359/762,
`359/754756, 761, 749 752, 691
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`6,697,202 B2*
`2/2004 Mori ............................. 359,749
`4/2006 Ning
`7,023,628 B1
`
`7,636,205 B2 * 12/2009 Yamamoto .................... 359,781
`7,656,591 B2*
`2/2010 Yamamoto .
`359,750
`7,733,576 B2 *
`6/2010 Kawana .....
`... 359/691
`8/2010 Jung et al.
`7,768,719 B2*
`... 359,762
`7,787,191 B2 * 8/2010 Wang .............
`359,682
`2010/027781.6 A1* 11/2010 Kweon et al. ................. 359/755
`
`FOREIGN PATENT DOCUMENTS
`61-123810 A
`6, 1986
`JP
`2599.312 B2
`4f1997
`JP
`2007-139.985. A
`6, 2007
`JP
`2007-279632 A 10/2007
`JP
`* cited by examiner
`
`Primary Examiner — Jordan Schwartz
`(74) Attorney, Agent, or Firm — Birch, Stewart, Kolasch &
`Birch, LLP
`
`(57)
`ABSTRACT
`An imaging lens is provided and includes, in order from the
`object side, a front group having a negative power, a stop, and
`a rear group having a positive power. The front group
`includes, in order from the object side, a first negative lens
`having a meniscus shape with a concave surface on an image
`side, a second negative lens, and a third positive lens. The rear
`group includes, in order from the object side, a fourth positive
`lens, a fifth negative lens having a meniscus shape with a
`concave Surface on the object side, and a sixth positive lens.
`An Abbe number of each of the first lens, the second lens, the
`fourth lens, and the sixth lens at the d-line is equal to or larger
`than 40, and an Abbe number of each of the third lens and the
`fifth lens at the d-line is equal to or smaller than 40. Each lens
`constituting the front group and the rear group is a single lens.
`
`24 Claims, 17 Drawing Sheets
`
`EXAMPLE 1
`
`
`
`
`
`S3
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 1 of 32
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`

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`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 1 of 17
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`US 8,248,715 B2
`
`FIG. 1
`
`20
`
`1G
`
`L2
`
`L3
`
`1K
`
`m/cKgmfigm-mm.D‘fififlhw
`
`U.5%...
`
`01
`
`1,ll_9I:I=l=l
`
`S15
`
`S4
`
`S5 36 $8 39 S11 S13
`
`\
`\\
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`; Y‘}
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`X
`
`200
`
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`_L___
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`\
`.\.
`\.\
`.\
`\
`\\
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`Sr!"’l"”’lt’l..T”""”"”‘uQ»N5%\=|'
`
`
`s,.3.L77pmas...
`
`s”I’ll/4_,.Afl/I/IA a
`l.,‘1‘1if»?!
`
`S3
`
`S12
`
`S14 S16,Jk
`
`Apple V. Corephotonics
`IPR2019—00030
`
`Exhibit 2016 Page 2 of 32
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 2 of 32
`
`
`

`

`U.S. Patent
`U.S. Patent
`
`Aug. 21, 2012
`Aug. 21, 2012
`
`Sheet 2 of 17
`Sheet 2 of 17
`
`US 8.248,715 B2
`US 8,248,715 B2
`
`FIG. 2
`FIG. 2
`
`EXAMPLE1
`EXAMPLE 1
`
`
`
`
`
`Apple V. Corephotonics
`IPR2019—00030
`
`Exhibit 2016 Page 3 of 32
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 3 of 32
`
`

`

`U.S. Patent
`
`Aug. 21, 2012
`
`Sheet 3 of 17
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`US 8.248,715 B2
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`FIG. 3
`
`EXAMPLE 2
`
`
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`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 4 of 32
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`

`

`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 4 of 17
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`US 8.248,715 B2
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`FIG. 4
`
`EXAMPLE 3
`
`
`
`S9 S11 S13 S15
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`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 5 of 32
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`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 5 Of 17
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`US 8.248,715 B2
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`EXAMPLE 4
`
`G1
`L2
`
`L3
`
`L1
`
`2
`
`G2
`
`- L4 L5
`
`L6
`
`Cg1
`S16
`
`St, S7
`
`w
`
`WN
`
`/7
`
`Q
`S14
`S12
`S3 S5 S6 S8 S9 S10
`S4
`S11
`S13 S15
`
`S2
`
`z1
`
`-.
`
`S1
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 6 of 32
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`

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`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 6 of 17
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`US 8.248,715 B2
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`FIG. 6
`
`EXAMPLE 5
`
`
`
`- - - - L3
`
`20
`y
`
`St, S7
`
`? N
`
`S5 S6
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 7 of 32
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`

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`U.S. Patent
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`Aug. 21, 2012
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`Sheet 7 of 17
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`US 8.248,715 B2
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`FIG. 7
`
`EXAMPLE 6
`
`
`
`20
`^
`
`Cg 1
`S16
`
`S8 S10 S12
`
`S15
`S14
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 8 of 32
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`

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`U.S. Patent
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`Aug. 21, 2012
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`Sheet 8 of 17
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`US 8.248,715 B2
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`G1
`L1 L2 L3
`
`EXAMPLE 7
`
`
`
`St, S7
`
`Z1
`
`Cg1
`S16
`
`S1
`
`S5 S6
`s2 S3 S4
`
`S8 S10 S12
`
`S15
`S14
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 9 of 32
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`

`

`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 9 Of 17
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`US 8.248,715 B2
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`FIG. 9
`
`EXAMPLE 8
`
`G1
`-
`L1 L2 L3
`
`a
`a
`L4 L5 L6
`
`St, S
`7
`
`N /Z
`
`--
`
`s
`
`\\\
`
`WN
`
`20 y
`
`Cg1
`
`S16
`
`m.
`
`S15
`S / S5 S6 S9 S11 A S13
`1
`S
`8
`S10 S12 S14
`2
`S4
`S
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 10 of 32
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`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 10 of 17
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`US 8.248,715 B2
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`G1
`L1 L2 L3
`
`
`
`FIG 10
`
`EXAMPLE 9
`
`G2
`-
`L4 L5 L6
`
`S5
`
`20
`y
`
`Cg1
`S16
`
`S15
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 11 of 32
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`

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`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 11 of 17
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`US 8.248,715 B2
`
`EXAMPLE 10
`
`G1
`L1 L2 L3
`
`G2
`L4 L5 L6
`
`St, S7
`
`2
`
`Cg1
`S16
`
`Z1
`
`S1
`
`S2
`
`N
`
`A S5
`
`S4
`
`se s8
`
`s9 sills14
`
`S15
`
`S10
`
`S13
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 12 of 32
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`

`

`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 12 of 17
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`US 8.248,715 B2
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`FIG. 12
`- - -\ —N
`
`EXAMPLE1
`
`
`
`doc76.5
`
`= 76.5
`
`
`
`- SAGITTAL
`w
`TANGENTIAL
`
`-0.2mm 0.2mm -0.2mm 0.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20 p.m 20 tim
`LATERAL CHROMATIC
`ABERRATION
`
`EXAMPLE 2
`
`
`
`c) =75.7
`
`a 75.7
`
`
`
`- SAGITTAL
`TANGENTIAL
`
`-O.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20 um 20tum
`LATERAL CHROMATIC
`ABERRATION
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 13 of 32
`
`

`

`U.S. Patent
`
`Aug. 21, 2012
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`Sheet 13 of 17
`
`US 8.248,715 B2
`
`FIG. 14
`- 1
`EXAMPLE 3
`
`
`
`c) = 75.3
`
`(a)=75.3
`
`- —N
`
`- SAGITTAL
`
`
`
`- - - - - TANGENTIAL
`
`-0.2mm 0.2mm -0.2mm 0.2mm
`SPHERICAL
`ASTIGMATSM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20tum 20 um
`LATERAL CHROMATIC
`ABERRATION
`
`FIG. 15
`
`EXAMPLE 4
`
`
`
`co-74.6
`
`c) =74.6
`
`a) =74.6
`
`
`
`- SAGITTAL
`TANGENTIAL
`
`-O.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`20 plm
`-20 Lim
`LATERAL CHROMATIC
`ABERRATION
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 14 of 32
`
`

`

`U.S. Patent
`
`Aug. 21, 2012
`
`Sheet 14 of 17
`
`US 8.248,715 B2
`
`FIG 16
`- -\ - -
`
`EXAMPLE 5
`
`
`
`a) E74.8
`
`a = 74.8
`
`-SAGITAL
`
`- - - - - TANGENTIAL
`
`
`
`-0.2mm 0.2mm -0.2mm 0.2mm
`SPHERICAL
`ASTIGMATSM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20tum 20tum
`LATERAL CHROMATIC
`ABERRATION
`
`EXAMPLE 6
`
`
`
`c) =75.4
`
`a)=75.4
`
`- SAGITTAL
`
`
`
`- - - - - TANGENTIAL
`
`-0.2mm 0.2mm -0.2mm 0.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20tum 20 tim
`LATERAL CHROMATIC
`ABERRATION
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 15 of 32
`
`

`

`U.S. Patent
`
`Aug. 21, 2012
`
`Sheet 15 Of 17
`
`US 8.248,715 B2
`
`FIG. 18
`- —-N —
`
`EXAMPLE 7
`
`
`
`co-75.5
`
`-75.5
`
`
`
`—SAGITAL
`
`as
`
`TANGENTIAL
`
`-O.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATSM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20 lim 20 tim
`LATERAL CHROMATIC
`ABERRATION
`
`EXAMPLE 8
`
`
`
`a F74.9
`
`a) R74.9
`
`c) F74.9
`
`- SAGITTAL
`
`
`
`r
`
`- TANGENTIAL
`
`-0.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20tum 20um
`LATERAL CHROMATIC
`ABERRATION
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 16 of 32
`
`

`

`U.S. Patent
`
`Aug. 21, 2012
`
`Sheet 16 of 17
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`US 8.248,715 B2
`
`FIG. 20
`- -\
`
`EXAMPLE 9
`
`
`
`c) E95.9
`
`a 95.9
`
`-
`
`
`
`A - SAGITTAL
`- - - - - TANGENTIAL
`
`-0.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATISM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20 p.m 20 um
`LATERAL CHROMATIC
`ABERRATION
`
`
`
`Fno. c 2.00
`
`a) = 96.2
`
`at 96.2
`
`EXAMPLE 10
`
`
`
`-SAGITTAL
`----- TANGENTIAL
`
`-O.2mm O.2mm -0.2mm O.2mm
`SPHERICAL
`ASTIGMATSM
`ABERRATION
`
`80%
`-80%
`DISTORTION
`
`-20 um 20 um
`LATERAL CHROMATIC
`ABERRATION
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 17 of 32
`
`

`

`U.S. Patent
`US. Patent
`
`Aug. 21, 2012
`Aug. 21, 2012
`
`Sheet 17 Of 17
`Sheet 17 of 17
`
`US 8.248,715 B2
`US 8,248,715 B2
`
`FIG. 22
`FIG. 22
`
`
`
`502-----
`
`
`
`Apple V. Corephotonics
`IPR2019-00030
`
`Exhibit 2016 Page 18 0f 32
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 18 of 32
`
`

`

`1.
`IMAGING LENS AND MAGINGAPPARATUS
`USING MAGING LENS
`
`US 8,248,715 B2
`
`This application is based on and claims priority under 35
`U.S.C S 119 from Japanese Patent Application Nos. 2008
`313893 and 2009-273449, filed on Dec. 10, 2008 and Dec. 1,
`2009, respectively, the entire disclosure of which is herein
`incorporated by reference.
`
`BACKGROUND OF THE INVENTION
`
`10
`
`15
`
`25
`
`30
`
`35
`
`1. Field of the Invention
`The present invention relates to an imaging lens imaging a
`Subject and an imaging apparatus using the imaging lens.
`2. Description of Related Art
`A compact imaging lens is known which is used in an
`imaging apparatus, such as an onboard camera or a Surveil
`lance camera. An imaging device which includes a compact
`CCD or CMOS having a large number of pixels for use in
`Such an imaging apparatus, or a compact imaging lens which
`is assembled with the imaging device is also known.
`As an imaging lens used in Such an imaging apparatus,
`imaging lenses described in U.S. Pat. No. 7,023,628, Japa
`nese Patent No. 25993 12, JP-A-61-123810, JP-A-2007
`279632, and JP-A-2007-139985 are also known in which a
`cemented lens is used so as to achieve reduction in size.
`The imaging lens described in U.S. Pat. No. 7,023,628 is a
`fast lens having an F number of 2.0, but multiple lenses made
`ofa material having a refractive index larger than 1.9 are used,
`which causes an increase in costs. The imaging lens described
`in Japanese Patent No. 2599312 or JP-A-2007-279632 uses
`an aspheric lens. When this imaging lens is used as a lens for
`an onboard camera or a lens for a Surveillance camera, if a
`lens is made of plastic, a significant change in performance
`occurs due to temperature. Further, the use of a lens formed by
`a glass mold causes an increase in costs. The imaging lens
`described in JP-A-61-123810 is a lens having an F number of
`2.8 to 4.0, and is too slow to use in an onboard camera or a
`40
`surveillance camera. The lens described in each of U.S. Pat.
`No. 7,023,628, Japanese Patent No. 2599312, JP-A-61
`123810, and JP-A-2007-279632 includes a cemented lens, so
`there is still room for improvement interms of environmental
`resistance.
`In the lens described in JP-A-2007-139985, multiple
`aspheric Surfaces are used, and one of the lens Surfaces is a
`diffractive optical surface. For this reason, when a lens is
`made of plastic, a significant change in performance occurs
`due to temperature. Further, the use of a lens formed by a glass
`mold causes an increase in costs.
`As an imaging lens used in an onboard camera or a Surveil
`lance camera, there is a need for a fast (Small F number),
`compact, and low-cost lens having excellent weather resis
`tance with Small deterioration in performance due to a change
`in temperature so as to be used in the inside of an automobile
`right on the equator in Summer or in the outdoors of a cold
`area in winter.
`In an imaging lens using a cemented lens, however, an
`adhesive material forming an adhesive layer is placed under a
`severe environment for a long time and then degenerated or
`modified, so the optical performance of the imaging lens is
`deteriorated.
`Special processing may be performed so as to allow the
`cemented lens to be used under a severe environment, but this
`processing causes an increase in costs.
`
`45
`
`50
`
`55
`
`60
`
`65
`
`2
`This problem generally occurs when an imaging lens using
`a cemented lens is used under a severe environment, regard
`less of whether it is an onboard camera or a surveillance
`CaCa.
`
`SUMMARY OF THE INVENTION
`
`In consideration of the above-described situation, an object
`of the invention is to provide an imaging lens capable of
`improving environmental resistance without deteriorating
`lens performance or without causing an increase in manufac
`turing costs, and an imaging apparatus using the imaging
`lens.
`According to a first aspect of the invention, there is pro
`vided an imaging lens including, in order from the object side,
`a front group having a negative power, a stop, and arear group
`having a positive power. The front group includes, in order
`from the object side, a first negative lens having a concave
`Surface on an image side, a second negative lens where an
`object-side lens surface thereof has a radius of curvature
`whose absolute value is larger than that of an image-side lens
`Surface thereof, and a third positive lens. The rear group
`includes, in order from the object side, a fourth positive lens,
`a fifth negative lens having a meniscus shape with a concave
`surface on the object side, and a sixth positive lens. An Abbe
`number of each of the first lens, the second lens, the fourth
`lens, and the sixth lens at the d-line is equal to or larger than
`40, and an Abbe number of each of the third lens and the fifth
`lens at the d-line is equal to or smaller than 40. Each lens
`constituting the front group and the rear group is a single lens.
`According to a second aspect of the invention, there is
`provided an imaging lens including, in order from the object
`side, a front group having a negative power, a stop, and a rear
`group having a positive power. The front group includes, in
`order from the object side, a first negative lens having a
`concave Surface on an image side, a second negative lens, and
`a third positive lens. The rear group includes two positive
`lenses and one negative lens. An Abbe number of each of the
`first lens and the second lens at the d-line is equal to or larger
`than 45, and an Abbe number of the third lens at the d-line is
`equal to or smaller than 25. An Abbe number of the negative
`lens constituting the rear group at the d-line is equal to or
`smaller than 25, and an Abbe number of each positive lens
`constituting the rear group at the d-line is equal to or larger
`than 45. Each lens constituting the front group and the rear
`group is a single lens. A distance from an object-side lens
`Surface of the first lens to the imaging Surface of the imaging
`lens is equal to or Smaller than 18 mm.
`The third lens may have a biconvex shape where an object
`side lens surface thereof has a radius of curvature whose
`absolute value is Smaller than that of an image-side lens
`surface thereof.
`The two positive lenses constituting the rear group may
`have a biconvex shape.
`The second lens may be a lens having a plano-concave
`shape with a flat Surface on the object side or a meniscus lens
`where an object-side lens surface thereof has a radius of
`curvature whose absolute value is larger than that of an
`image-side lens Surface thereof.
`The imaging lens may satisfy the following conditional
`expression (1): 0.5<R10/R9<1.0. For the conditional expres
`sion (1), R9 is a radius of curvature of an image-side lens
`Surface of a lens nearest to the object side from among the
`lenses constituting the rear group, and R10 is a radius of
`curvature of an object-side lens Surface of a lens adjacent to
`the image side of a lens nearest to the object side from among
`the lenses constituting the rear group.
`
`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 19 of 32
`
`

`

`3
`The imaging lens may satisfy the following conditional
`expression (2): 0.8<lf12/f-1.8. For the conditional expres
`sion (2), f is a focal length of the imaging lens, and f12 is a
`composite focal length of the first lens and the second lens.
`The imaging lens may satisfy the following conditional
`expression (3): 1.0<lf123/f456|<2.2. For the conditional
`expression (3), f123 is a composite focal length of the front
`group, and f456 is a composite focal length of the rear group.
`The imaging lens may satisfy the following conditional
`expression (4): 5<L/f-18. For the conditional expression (4),
`fis a focal length of the imaging lens, and L is a distance from
`the object-side lens Surface of the first lens to the imaging
`Surface of the imaging lens.
`In calculating the value L, an air-converted value is used for
`the distance (back focal length) from a lens Surface nearest to
`the image side from among the lens Surfaces constituting the
`imaging lens to the imaging Surface of the imaging lens.
`The imaging lens may satisfy the following conditional
`expression (5): 0.5<Bf7f-3.0. For the conditional expression
`(5), f is a focal length of the imaging lens, and Bf is a back
`focal length.
`The back focal length is a distance on the optical axis from
`a lens Surface nearest to the image side from among the lens
`Surfaces constituting the imaging lens to the imaging Surface
`of the imaging lens. When cover glass or various filters are
`present between the imaging lens and the imaging Surface, the
`air-converted values of the cover glass and the filters are used
`for Bf
`The imaging lens may satisfy the following conditional
`expression (6): 2.0<fa5/f-6.5. For the conditional expression
`(6), f is a focal length of the imaging lens, and f45 is a
`composite focal length of two adjacent lenses nearest to the
`object side from among the lenses constituting the rear group.
`Each of the first lens to the sixth lens may be a glass lens.
`According to a third aspect of the invention, there is pro
`Vided an imaging apparatus including the imaging lens
`according to the first of the invention, and an imaging device
`converting an optical image formed by the imaging lens into
`an electrical signal.
`According to a fourth aspect of the invention, there is
`provided an imaging apparatus including the imaging lens
`according to the second of the invention, and an imaging
`device converting an optical image formed by the imaging
`lens into an electrical signal.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The features of the invention will appear more fully upon
`consideration of the exemplary embodiment of the invention,
`which are schematically set forth in the drawings, in which:
`FIG. 1 is a sectional view showing the schematic configu
`ration of an imaging lens and an imaging apparatus according
`to an exemplary embodiment of the invention;
`FIG. 2 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 1:
`FIG. 3 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 2:
`FIG. 4 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 3:
`FIG. 5 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 4;
`FIG. 6 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 5:
`FIG. 7 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 6:
`FIG. 8 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 7:
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`FIG. 9 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 8;
`FIG. 10 is a sectional view showing the schematic configu
`ration of an imaging lens of Example 9;
`FIG. 11 is a sectional view showing the schematic configu
`ration of an imaging lens;
`FIG. 12 is a diagram showing aberrations of the imaging
`lens of Example 1:
`FIG. 13 is a diagram showing aberrations of the imaging
`lens of Example 2:
`FIG. 14 is a diagram showing aberrations of the imaging
`lens of Example 3:
`FIG. 15 is a diagram showing aberrations of the imaging
`lens of Example 4;
`FIG. 16 is a diagram showing aberrations of the imaging
`lens of Example 5:
`FIG. 17 is a diagram showing aberrations of the imaging
`lens of Example 6:
`FIG. 18 is a diagram showing aberrations of the imaging
`lens of Example 7:
`FIG. 19 is a diagram showing aberrations of the imaging
`lens of Example 8:
`FIG. 20 is a diagram showing aberrations of the imaging
`lens of Example 9:
`FIG. 21 is a diagram showing aberrations of the imaging
`lens of Example 10; and
`FIG. 22 is a diagram showing an automobile on which
`onboard equipment including an imaging apparatus accord
`ing to an embodiment of the invention is mounted.
`
`DETAILED DESCRIPTION OF THE
`EXEMPLARY EMBODIMENTS
`
`An imaging lens or an imaging apparatus according to the
`first or third aspect of the invention includes, in order from the
`object side, the front group having a negative power, the stop,
`and the rear group having a positive power. The front group
`includes, in order from the object side, the first negative lens
`having a concave Surface on the image side, the second nega
`tive lens where the object-side lens surface thereof has the
`radius of curvature whose absolute value is larger than that of
`the image-side lens surface thereof, and the third positive
`lens. The rear group includes, in order from the object side,
`the fourth positive lens, the fifth negative lens having a menis
`cus shape with a concave surface on the object side, and the
`sixth positive lens. The Abbe number of each of the first lens,
`the second lens, the fourth lens, and the sixth lens at the d-line
`is equal to or larger than 40, and the Abbe number of each of
`the third lens and the fifth lens at the d-line is equal to or
`Smaller than 40. Each lens constituting the front group and the
`rear group is a single lens. Therefore, environmental resis
`tance can be improved without deteriorating lens perfor
`mance or without causing an increase in manufacturing costs.
`Specifically, with an imaging lens or an imaging apparatus
`according to the first or third aspect of the invention, the
`following advantages can be obtained.
`That is, each lens constituting the front group and the rear
`group is a single lens, and no cemented lens is used. For this
`reason, no special processing for lens cementation is needed,
`and occurrence of a problem due to lens cementation is Sup
`pressed. Therefore, environmental resistance can be
`improved without deteriorating lens performance or without
`causing an increase in manufacturing costs.
`The first lens and the second lens nearest to the object side
`in the imaging lens have negative power, which makes it easy
`to increase an angle of view in the imaging lens. The first lens
`is a lens having a concave Surface on the image side, and the
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`Apple v. Corephotonics
`IPR2019-00030
`Exhibit 2016 Page 20 of 32
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`US 8,248,715 B2
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`second lens is a negative lens where an object-side lens Sur
`face thereofhas a radius of curvature whose absolute value is
`larger than that of an image-side lens Surface thereof. In this
`way, entrance rays at a wide angle of view larger than 130°
`can be captured.
`The Abbe number of each of the first lens and the second
`lens at the d-line is equal to or larger than 40, so occurrence of
`chromatic aberration can be suppressed while an angle of
`view in an imaging lens can be increased.
`The third lens is a positive lens, so the field curvature can be
`satisfactorily corrected. The Abbe number of the third lens at
`the d-line is equal to or Smaller than 40, so lateral chromatic
`aberration can be satisfactorily corrected.
`The fourth lens is a positive lens, the fifth lens is a negative
`lens, the Abbe number of the fourth lens at the d-line is equal
`to or larger than 40, and the Abbe number of the fifth lens at
`the d-line is equal to or smaller than 40. Therefore, longitu
`dinal chromatic aberration and lateral chromatic aberration
`can be satisfactorily corrected.
`The fifth lens is a negative meniscus lens having a concave
`Surface on the object side, so field curvature can be satisfac
`torily corrected.
`The sixth lens is a lens having positive power, so the
`entrance angle of marginal rays to the imaging Surface of the
`imaging lens can be made Small. Therefore, a lens having
`good telecentricity can be realized.
`An imaging lens or an imaging apparatus according to the
`second or fourth aspect of the invention includes, in order
`from the object side, the front group having negative power,
`the stop, and the rear group having positive power. The front
`group includes, in order from the object side, the first negative
`lens having a concave surface on the image side, the second
`negative lens, and the third positive lens. The rear group
`includes two positive lenses and one negative lens. The Abbe
`number of each of the first lens and the second lens at the
`d-line is equal to or larger than 45, and the Abbe number of the
`third lens at the d-line is equal to or smaller than 25. The Abbe
`number of one negative lens constituting the rear group at the
`d-line is equal to or smaller than 25, and the Abbe number of
`each of the two positive lenses at the d-line is equal to or larger
`40
`than 45. Each lens constituting the front group and the rear
`group is a single lens. The distance from the object-side lens
`Surface of the first lens to the imaging Surface of the imaging
`lens is equal to or smaller than 18 mm. Therefore, environ
`mental resistance can be improved without deteriorating lens
`performance or without causing an increase in manufacturing
`COStS.
`Specifically, with an imaging lens or an imaging apparatus
`according to the second or fourth aspect of the invention, the
`following advantages can be obtained.
`That is, each lens constituting the front group and the rear
`group is a single lens, and no cemented lens is used. For this
`reason, no special processing for lens cementation is needed,
`and occurrence of a problem due to lens cementation is Sup
`pressed. Therefore, environmental resistance can be
`improved without deteriorating lens performance or without
`causing an increase in manufacturing costs. Each lens consti
`tuting the front group and the rear group is a single lens, so
`degeneration or modification at the cemented Surface due to
`physical and chemical stimuli can be suppressed. As a result,
`environmental resistance can be further improved.
`The first lens L1 and the second lens L2 are lenses having
`negative power, so a wide-angle imaging lens is easily real
`ized. The first lens is a lens having a concave Surface on the
`image side, and the second lens is a negative lens. Therefore,
`entrance rays at a wide angle of view larger than 130° can be
`captured. Further, when the second lens is a negative menis
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`cus lens having a convex surface on the object side, it is
`possible to easily increase an angle of view in the lens radius
`while Suppressing distortion.
`The third lens is a positive lens, so the field curvature can be
`satisfactorily corrected.
`The two positive lenses and one negative lens are arranged
`at the back of the stop, so field curvature and spherical aber
`ration can be satisfactorily corrected.
`The Abbe number of the lens having negative power of the
`front group at the d-line is equal to or larger than 45. So
`occurrence of chromatic aberration can be suppressed while
`an angle of view in an imaging lens can be increased.
`The Abbe number of the lens having positive power of the
`front group at the d-line is equal to or Smaller than 25, so
`lateral chromatic aberration can be satisfactorily corrected.
`The Abbe number of the lens having negative power of the
`front group at the d-line is equal to or Smaller than 25, and the
`Abbe number of the lens having positive power of the rear
`group at the d-line is equal to or larger than 45, so longitudinal
`chromatic aberration and lateral chromatic aberration can be
`satisfactorily corrected.
`The distance from the object-side lens surface of the first
`lens to the imaging Surface is equal to or Smaller than 18 mm,
`So an imaging lens can be reduced in size.
`Hereinafter, an exemplary embodiment of the invention
`will be described with reference to the drawings. FIG. 1 is a
`sectional view showing the schematic configuration of an
`embodiment of an imaging lens of the invention and an imag
`ing apparatus using the imaging lens.
`An imaging apparatus 100 shown in FIG. 1 is applied to an
`onboard camera or the like for photographing the front side,
`the lateral side, and the rear side of an automobile. The imag
`ing apparatus 100 includes an imaging device 10 having a
`CCD or a CMOS, and an imaging lens 20.
`The imaging lens 20 forms an optical image of a Subject on
`the light receiving surface Jk of the imaging device 10. The
`imaging device 10 converts the optical image of the Subject
`formed on the light receiving Surface Jk by the imaging lens
`20 and outputs an image signal representing the optical
`image.
`<Basic Configuration of Imaging Lens, and Operation and
`Advantage Thereof
`First, two types of basic configuration of the imaging lens
`20, a first basic configuration and a second basic configura
`tion, will be described.
`The imaging lens 20 having the following first basic con
`figuration includes, in order from an object side along an
`optical axis Z1 (in the drawing, the -Z direction side), a front
`group G1 having negative power, an aperture diaphragm Stas
`an exemplary embodiment of a stop, and a rear group G2
`having positive power.
`The front group G1 includes, in order from the object side,
`a first negative lens L1 having a meniscus shape with a con
`cave Surface on an image side (in the drawing, the +Z direc
`tion side), a second negative lens L2 where an object-side lens
`surface thereofhas a radius of curvature whose absolute value
`is larger than that of an image-side lens Surface thereof, and a
`third positive lens L3.
`The rear group G2 includes, in order from the object side,
`a fourth positive lens L4, a fifth negative lens L5 having a
`meniscus shape with a concave Surface on the object side, and
`a sixth positive lens L6.
`An Abbe number of each of the first lens L1, the second
`lens L2, the fourth lens L4, and the sixth lens L6 at the d-line
`is equal to or larger than 40, and an Abbe number of each of
`the third lens L3 and the fifth lens L5 at the d-line is equal to
`or smaller than 40.
`
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`IPR2019-00030
`Exhibit 2016 Page 21 of 32
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`Each lens constituting the front group G1 and the rear
`group G2 is a single lens.
`The imaging lens 20 having the following second basic
`configuration includes, in order from the object side, a front
`group G1 having negative power, an aperture diaphragm St,
`and a rear group G2 having positive power.
`The front group G1 includes, in order from the object side,
`a first negative lens L1 having a meniscus shape with a con
`cave Surface on the image side, a second negative lens L2
`having a meniscus shape where an object-side lens Surface
`thereof has a radius of curvature whose absolute value is
`larger than that of an image-side lens Surface thereof, and a
`third positive lens L3.
`The rear group G2 includes two positive lenses and one
`negative lens.
`An Abbe number of each of the first lens L1 and the second
`lens L2 at the d-line is equal to or larger than 45, and an Abbe
`number of the third lens L3 at the d-line is equal to or smaller
`than 25. An Abbe number of one negative lens constituting the
`rear group G2 at the d-line is equal to or Smaller than 25, and
`an Abbe number of each of the two positive lenses constitut
`ing the rear group at the d-line is equal to or larger than 45.
`A distance from an object-side lens surface S1 of the first
`lens L1 to the imaging Surface S16 of the imaging lens 20 is
`preferably equal to or smaller than 21 mm, more preferably
`equal to or Smaller than 18 mm.
`The light receiving surface Jk of the imaging device 10 is
`arranged on the imaging Surface S16 on which the optical
`image representing the Subject is formed through the imaging
`lens 20, as described above.
`In any of the first and second configuration, the imaging
`lens 20 may include a flat plate-shaped optical member CG1,
`Such as an infrared cut filter or cover glass for protecting the
`light receiving Surface Jk, between the rear group G2 and the
`imaging device 10. The optical member CG1 selected
`depending on the specification of the imaging apparatus 100
`is arranged.
`In FIG.