EXHIBIT 2186
`
`EXHIBIT 2186EXHIBIT 2186
`
`
`
`

`
`United States Patent
`Doh et al.
`
`[19]
`
`11111111111 M II 1111E11 111E1111 II
`US006147802A
`[11] Patent Number:
`[45] Date of Patent:
`
`II
`
`111111111111
`
`6,147,802
`Nov. 14, 2000
`
`[75]
`
`Appl. No.:
`
`[54] POLARIZATION LUMINAIRE AND
`PROJECTION DISPLAY
`Inventors: Yoshitaka Itoh; Kunio Yoneno;
`Junichi Nakamura, all of Nagano-ken;
`Tadaaki Nakayama, Mishima-gun, all
`of Japan
`[73] Assign.: Seiko Epson Corporation, Tokyo,
`Japan
`08/619,663
`Jul. 21, 1995
`PCT Filed:
`PCT/JP95/01448
`PCT No.:
`*371 Date:
`Feb. 6, 1997
`§ 102(e) Date: Feb. 6, 1997
`PCT Pub. No.: W096/20422
`PCT Pub. Date: Jul. 4, 1996
`Foreign Application Priority Data
`[30]
`Dec. 28, 1994
`Japan
`[JP]
`Feb. 20, 1995
`Japan
`[JP]
`Mar. 9, 1995
`Japan
`[JP]
`Int. CI.'
`U.S. Cl.
`
`6-326813
`7-031024
`7-050175
`GO2B 5/30
`359/500; 359/494; 359/495;
`359/496; 349/5; 349/9; 349/194; 353/20
`[58] Field of Search
`349/201, 194,
`349/193, 96, 9, 5, 8; 353/20; 362/19; 359/500,
`495, 494, 483, 485, 496
`
`[56]
`
`References Cited
`U.S. PATENT DOCUMENTS
`Re. 26,506 12/1968 Rogers
`3/1992 van den Brandt et al.
`5,098,184
`2/1993 De Vaan et al.
`5,184,248
`5,283,600
`2/1994 Imai
`2/1997 Van Den Brandt
`5,601,351
`5/1997 Heynderickx et al.
`5,626,408
`7/1997 Hirabayashi et al.
`5,648,859
`5/1999 Hikmet
`5,900,977
`
`362/19
`353/102
`359/483
`353/34
`353/20
`353/20
`349/9
`349/96
`
`(EMBODIMENT 1)
`
`FOREIGN PATENT DOCUMENTS
`0451034 10/1991
`European Pat. Off.
`508413 A2 10/1992 European Pat. Off.
`
`349/9
`002B 27/28
`
`(List continued on next page.)
`
`OTHER PUBLICATIONS
`
`van den Brandt et al., "New Plusfactors in an LCD-Projec-
`tor", IEEE 1991, San Diego, CA, pp. 151-154.
`Imai et al., "A Novel Polarization Converter for High-
`Brightness Liquid Crystal Light Valve Projector", Eurodis-
`play 1992, pp. 257-260.
`"Magneto-Optic Beam Splitter", IBM Technical Disclosure
`Bulletin, vol. 32, No., 4B, Sep. 1, 1989, p. 438-439.
`
`Primary ExaminerCassandra Spyrou
`Assistant ExaminerJohn Juba, Jr.
`Attorney, Agent, or FirnzOliff & Berridge, PLC
`ABSTRACT
`[57]
`A polarization luminaire of the present invention has a light
`source, an optical integrator, a polarized light splitting
`means and a polarization conversion means. The polarized
`light splitting means splits a light emitted from thc light
`source into two kinds of polarized lights. The polarization
`directions of the two kinds of polarized lights are perpen-
`dicular to cach other and travel in dircctions separated by an
`angle of less than 90 degrees. The polarization conversion
`means modifies the two kinds of polarized lights to have the
`samc polarization direction. The polarized light splitting
`means is placed on the entrance side or the outputting side
`of a first lens plate of the optical integrator, or is placed
`within a second lens plate. A prism beam splitter having a
`polarized light splitting film that includes a thermally stable
`dielectric multi-layer film may be used as the polarind light
`splitting means. The present invention utilizes most of the
`polarized lights by causing the polarized lights to have the
`samc polarization direction. Funher, uniform brightness is
`emitted. Consequently, the polarization luminaire of the
`present invention is suited for use in a projection display.
`
`2 Claims, 45 Drawing Sheets
`
`111
`
`104: HALF-WAVE PLATE r-)
`103: LIQUID CRYSTAL
`
`100
`
`107
`109: REGION TO BE IllUIAINATED
`
`106: SECOND LENS PLATE 105 FIRST LENS PLATE
`
`101
`
`102
`
`(UQUID CRYSTAL POLARIZED LIGHT SPLITTING UNIT)
`103
`
`EXHIBIT
`
`e4Ae4
`
`REALD INC.
`Exhibit 2186-1
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`6,147,802
`Page 2
`
`FOREIGN PATENT DOCUMENTS
`576072 Al 12/1993 European Pat. Off.
`...... GO2B 27/28
`002F 1/13
`0-646-828-Al
`4/1995 European Pat. Off.
`935663
`1/1956 Germany. .
`Japan
`5/1986
`61-102626
`Japan
`61-90584
`5/1986
`Japan
`5/1988
`63-121821
`Japan
`63-168622
`7/1988
`Japan
`63-271313
`11/1988
`Japan
`10/1989
`1-265228
`2-128103 U 10/1990
`Japan
`2-308204
`Japan
`12/1990
`
`GO2F 1/13
`002F 1/03
`002F 1/133
`002F 1/13
`GO2B 27/28
`002F 1/133
`002B 5/30
`002B 5/30
`
`3-122631
`403223811
`5-19208
`5-72417
`5-181135
`5-196891
`6-202094
`6-289387
`6-324329
`7-225379
`7-294906
`WO 94/22042
`
`5/1991
`Japan
`Japan
`10/1991
`Japan
`1/1993
`Japan
`3/1993
`7/1993
`Japan
`8/1993
`Japan
`7/1994
`Japan
`Japan
`10/1994
`Japan
`11/1994
`Japan
`8/1995
`Japan
`11/1995
`3/1994 WIPO .
`
`002B 27/10
`349/9
`002B 27/28
`002B 27/28
`002F 1/1335
`002B 27/28
`002F 1/1335
`002F 1/1335
`002F 1/1335
`002F 1/1335
`002F 1/1335
`
`REALD INC.
`Exhibit 2186-2
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 1 of 45
`
`6,147,802
`
`(EMBODIMENT 1)
`
`104: HALF-WAVE PLATE »
`
`100
`
`107
`
`103: LiQUID CRYSTAL
`
`109: REGION TO BE ILLUMINATED
`
`106: SECOND LENS PLATE 105: FIRST LENS PLATE
`
`101
`
`102
`
`FIG. 1 A
`
`105: FIRST LENS PLATE
`
`FIG. lB
`
`REALD INC.
`Exhibit 2186-3
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`$. 3t6
`
`i!v4.0,110
`
`5Nt.egt
`
`1S'S
`
`04,0
`
`REALD INC.
`Exhibit 2186-4
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 3 of 45
`
`6,147,802
`
`122
`
`121
`
`,106
`
`123
`
`0 0 e000
`000
`
`FIG. 1D
`
`131
`
`FIG. 1 E
`
`REALD INC.
`Exhibit 2186-5
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`I
`
`l
`
`,e)"
`
`00Z
`
`N00
`0N
`e
`
`41.
`
`REALD INC.
`Exhibit 2186-6
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`C 1£
`
`c160 V.N.4
`
`o
`
`a.,
`v5
`
`cL)Il
`
`15
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`V2 '01..i
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`Lit
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`10E
`
`901j
`1701. ?got
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`ZOE
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`COE
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`0601,
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`C IC
`
`10 L
`
`DiOt
`
`REALD INC.
`Exhibit 2186-7
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 6 of 45
`
`6,147,802
`
`304
`
`305
`II3K"f
`
`dMENNE6
`
`...
`
`110.
`
`Per
`
`A 1
`
`111Ell
`
`=.1.
`
`womm....
`
`4 V
`
`A1
`
`FIG. 3B
`
`REALD INC.
`Exhibit 2186-8
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`sz4
`4=6
`
`FIG.4A
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`402: POLARIZED UGHT SPUTTING PORTION
`
`SPUTTING FILM
`
`426: POLARIZED UGHT
`
`446: HALF-WAVE PLATE
`
`P
`
`425
`
`429: REFIECTION FILM
`
`NEARLY-PLATE-UKE QUADRANGULAR PRISM
`
`RECTANGULAR PRISM
`
`427
`
`428
`
`431: PLANE OF INCIDENCE
`
`423S
`
`--------
`
`447
`
`443
`
`444
`
`\,
`
`404: REGION TO BE IU.UMINATED
`
`L SYSTEM OPTICk AXIS
`
`LENS PLATE
`442: SECOND
`
`(
`
`445: PLANO-CONVEX LENS
`
`401: UGHT SOURCE PORTION
`
`412
`
`SOURCE LAMP
`411: UGHT
`
`I
`
`if
`
`441: FIRST LENS PLATE
`
`\424: DEVIATION PRISM
`
`(EMBODIMENT 2)
`
`400: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-9
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 8 of 45
`
`6,147,802
`
`402
`
`422: NEARLY-PLATE-LIKE QUADRANGULAR PRISM
`
`426: POLARIZED UGHT
`SMITING FBI
`
`428
`
`429: REFLECTION FILM
`424: DEVIATION PRISM
`
`427
`
`3
`
`SEPARATION
`ANGLE
`
`421: RECTANGULAR PRISM
`
`424: DEVIATION PRISM
`
`FIG. 4B
`
`REALD INC.
`Exhibit 2186-10
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 9 of 45
`
`6,147,802
`
`442
`
`i
`,
`
`444: MICROLENS
`
`\ l
`
`\
`
`,
`
`,
`
`i
`
`\
`
`,
`
`, ,
`
`C2: SECONDARY UGHT SOURCE IMAGE
`FORMED FROM S-POLARIZED LIGHT Cl: SECONDARY LIGHT SOURCE IMAGE
`FORMED FROM P-POIARIZED LIGHT
`
`FIG. 4C
`
`REALD INC.
`Exhibit 2186-11
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.5
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`402: POLARIZED UGHT SPUTTING PORTION
`
`SPUTTING FILM
`
`426: POLARIZED UGHT
`
`446: HALF-WAVE PLATE
`
`429: REFLECTION FlUi
`
`NEARLY-PLATE-UKE QUADRANGULAR PRISM
`
`RECTANGULAR PRISM
`
`404: REGION TO BE ILLUMINAW11
`
`L: SYSTEM OPTICAL AXIS
`
`412
`
`NSLE PIATE
`
`442: SECOND
`
`445: PLANO-CONVEX LENS
`
`401: UGHT SOURCE PORTION
`
`PRISM
`
`424:
`
`411
`
`441: FIRST LENS PLATE
`
`(EMBODIMENT 3)
`
`500: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-12
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`402: POLARIZED UGHT SPUTTING PORTION
`
`FIG.6
`
`403: SYSTEM OF THE OF'TICAL INTEGRATOR
`
`SPUTTING FILM
`
`426: POIARIZED UGHT
`
`446: HALF-WAVE PLATE
`
`429: REFLECTION FILM
`
`pPPI7421:
`
`422: NEARLY-PLATE-UKE QUADRANGULAR PRISM
`
`RECTANGULAR PRISM
`
`431
`
`423
`
`404: REGION TO BE ILLUMINATED
`
`1: SYSTEM OPTICAL AXIS
`
`LENS PLATE
`442: SECOND
`
`(
`
`445: PLANO-CONVEX LENS
`
`401: UGHT SOURCE PORTION
`
`,
`
`,
`
`%
`
`r
`
`,
`
`441: FIRST IINS PLATE
`
`\424:DEVIATION PRISMir
`
`401%
`
`(EMBODIMENT 4)
`
`600: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-13
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`402: POLARIZED LIGHT SPUTTING PORTION
`
`429: REFLECTION FILM
`
`NEARLY-PLATE-LIKE QUADRANGUIAR PRISM
`
`RECTANGULAR PRISM
`
`431
`
`401: UGHT SOURCE PORTION
`
`FIG.7
`
`403: SYSTEM OF NE OPTICAL INTEGRATOR
`
`SPUTIING FILM
`
`426: POLARIZED UGHT
`
`r...._____)
`
`446: HALF-WAVE PLATE
`
`)
`
`.,r
`
`404: REGION TO BE ILLUMINATED\.
`
`L SYS1DA OPTICAL AXIS
`
`LATE
`
`445: P1ANO-CONVEX LENSLENP (S
`
`442: SECOND
`
`441: F1RST LENS PLATE
`
`\\424:DEVIATION PRISM
`
`(EMBODIMENT 5)
`
`700: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-14
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`402: POLARIZED UGHT SPLITTING PORTION
`
`429: REFLECTION ADA
`
`NEARLY-PLATE-LIKE QUADRANGULAR PRISM
`
`RECTANGULAR PRISM
`
`421L,
`
`421G
`
`FIG.8
`
`403: SYSTEM OF NE OPTICAL INTEGRATOR
`
`SPLITTING FILM
`
`446: HALF-WAVE PLATE
`
`426: POLARIZED LIGHT
`
`) i
`
`LENSLATE
`442: SECOND
`
`(P
`
`404: REGION TO BE ILLUMINATED\
`
`L.: SYSTEM OPTICAL AXIS
`
`455: PLANO-CONVEX LENS
`
`401: LIGHT SOURCE PORTION
`
`(EMBODIMENT 6)
`
`BOO: POLARIZATION LUMINAIRE
`
`424: DEVIATION PRISM
`
`PLATE
`
`FIRST LENS
`
`441:
`
`\\
`
`REALD INC.
`Exhibit 2186-15
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`SPUTTING ALM
`
`402: POIARIZED UGHT
`
`91D
`
`911D 911C
`
`91C
`
`FIG.9
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`429: REFLECTION RUA
`
`426: POIARIZED UGHT SPLITfiNG PORTION
`
`911B
`
`911A 91A
`
`922
`
`F`'
`
`IV
`
`AÌ1ON
`
`443
`
`441
`
`442
`
`404
`
`401: UGHT SOURCE PORTION
`
`900: POLARIZATION LUMINAIRE
`
`(EMBODIMENT 7)
`
`REALD INC.
`Exhibit 2186-16
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.10
`
`SPLM1NG POR110N
`
`402: POLARIZED UGHT
`
`403: SYSTDA OF THE OPTICAL INTEGRATOR
`
`%_,______) 1/4_______y_____,
`
`426: POLARIZED LIGHT SPLITTING FBI
`
`429: REFLECTION FILM
`
`428
`
`427
`
`422
`
`i
`
`"i
`
`TI I
`
`401: IJGHT SOURCE PORTION
`
`(EMBODIMENT 8)
`
`\\
`
`1000: POLARIZATION WMINAIRE
`
`REALD INC.
`Exhibit 2186-17
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.11
`
`C:PN
`
`402: POLARIZED UGHT SPUTTING PORTION
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`1104
`
`446: HALF-WAVE PLATE 1105
`
`1103
`
`429
`
`1101
`
`1102
`426
`
`1105
`
`443
`
`404: REGION TO BE ILLUMINATED
`
`L SYSTEM OPTICAL AXIS
`
`LENS PLATE
`442: SECOND
`
`445: PIANO-CONVEX LENS
`
`401: LIGHT SOURCE PORTION
`
`\424: DEVIATION PRISM
`
`441: FIRST LENS PLATE
`
`(EMBODIMENT 9)
`
`1100: POIARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-18
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`401: UGHT SOURCE PORTION
`
`FIG. 12A
`
`403: SYSTEM OF THE OPfiCAL INTEGRATOR
`
`429
`
`441
`
`442
`
`447
`
`1205E
`
`1205D
`
`=me:me
`1241
`1-205C
`12058
`
`W1
`
`1203
`
`1205A
`
`443111
`IMO
`ahitMl
`
`444
`
`p 1202
`
`ir
`
`al ACI
`
`CIF
`
`1231
`
`451
`
`431
`
`404
`
`429: REFLECTION
`
`1204
`
`446
`
`1201: POLARIZED UGHT SPLITTING PORTION
`
`426: POLARIZED UGHT SPUTTING FILM
`
`1200: POLARIZATION LUMINAIRE
`
`(DIBODIMENT 10)
`
`REALD INC.
`Exhibit 2186-19
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 18 of 45
`
`6,147,802
`
`426: POLARIZED UGHT SPUTTING FILM
`
`1211
`
`401: TO IJGHT SOURCE PORTION
`
`1205B
`
`426 \
`1221
`
`1
`
`429
`1231
`1212
`1204
`1203
`1202
`
`429: REFUECDON
`ALM
`
`-1241
`
`PRISM
`
`COMPOSITE
`
`ELEMENT
`
`L-"
`
`1205A
`
`1205B
`
`1205C
`
`V
`
`1205D
`
`1205E
`
`TO SYSTEM Of THE OFIXAL IMEGRATOR
`(403)
`
`FIG. 12B
`
`REALD INC.
`Exhibit 2186-20
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.13
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`l..._____y___)
`
`401: LJGHT SOURCE PORTION
`
`1 205C
`1205B
`1 205A
`
`I W1
`
`1201: POLARIZED LJGHT SPLITTING PORTION
`
`,-.-.
`
`1231
`
`447
`
`1250: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-21
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`ts4
`
`FIG.14
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`1401: POLARIZED UGHT SPLITTING PORTION
`
`401: UGHT SOURCE PORTION
`
`----
`/4Li
`
`442
`
`443A
`
`1231
`
`1421
`
`1404404E
`
`_
`
`401403
`
`4C11111
`
`111
`
`MP
`
`443
`
`2#
`
`P
`
`426
`
`445
`
`1404B
`
`1412
`
`1404A
`
`--
`s1402Amo
`
`_P 1411
`
`443A
`
`441
`
`404: REGION TO BE ILLUMINATED 1431
`
`1430
`
`1400: POLARIZATION LUMINAIRE
`
`(EMBODIMENT 11)
`
`REALD INC.
`Exhibit 2186-22
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.15
`
`1501: POLARIZED LIGHT SPLITTING PORTION
`
`403: SYSTEM OF THE OPTICAL INTEGRATOR
`
`401: LIGHT SOURCE PORTION
`
`1504F
`
`CID
`
`4D,
`
`15041D504E
`
`mum gm=
`
`------------
`
`1530
`
`1504C
`--1511--
`1503
`
`_
`
`15048
`
`1504A
`
`426
`
`441
`
`444
`
`1550
`
`442
`
`(EMBODIMENT 12)
`
`445
`
`1551
`
`404
`
`1500: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-23
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`1650: LIGHT GUIDING MEANS(RELAY LENS SYSTEM)
`
`FIG. 16
`
`1607
`
`610
`
`1608
`
`1606
`
`1604: DICHROIC MIRROR
`
`1601
`
`1611: LIQUID CRYSTAL LIGHT VALVE
`
`1609
`
`1605
`
`1614
`
`i
`
`L,
`
`1200: POLARIZATION LUMINAIRE
`
`,
`
`1201
`
`rAT:4fi
`
`403
`
`1613: DICHROIC PRISM
`
`1602
`
`1600: PROJECTION DISPLAY
`
`REALD INC.
`Exhibit 2186-24
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG. 17
`
`1702: DICHROIC MIRROR
`
`402
`
`446
`
`1701
`
`1709
`
`1706
`
`403
`
`/1/4
`
`424
`
`1705
`
`401
`
`1707
`
`1703
`
`400: POLARIZATION LUMINAIRE
`
`1704: DICHROIC MIRROR
`
`1710
`
`1700: PROJECTION DISPLAY
`
`1711
`
`REALD INC.
`Exhibit 2186-25
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 24 of 45
`
`6,147,802
`
`1800
`
`404
`
`1812
`
`1811
`
`1810
`
`402
`
`1821
`
`1820
`
`446
`
`1813
`
`FIG. 18A
`
`442 446
`
`444
`
`444A
`444B
`
`447
`448
`
`I
`
`I>1
`
`i)
`
`I
`
`1
`I
`
`I
`
`FIG. 18D
`
`FIG. 18B
`
`====i
`
`FIG. 18C
`
`REALD INC.
`Exhibit 2186-26
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`tS%
`
`sTk
`a'N
`
`1921: FIRST QUARTER-WAVE PLATE
`
`1912
`
`1913
`
`FIG.19A
`
`MIRROR PLATE
`
`1901: FIRST CONDENSING403
`
`1910
`
`LENSPLATE1942
`
`L: SYSTEM OPTICAL AXIS
`
`1941: CONDENSOR
`
`)
`
`1922: QUARTER-WAVE PLATE
`
`447
`
`n.)
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`402: POLARIZED UGHT SPLITTING
`
`PORTION
`
`1911
`
`412
`
`446: HALF-WAVE PLATE
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`426: POLARIZED UGHT SPUTTING FlUA
`
`1910
`
`1900: POLARIZATION LUMINAIRE
`
`401: LIGHT SOURCE PORTION
`
`411
`
`SYSTEM OPTICAL AXIS
`
`(EMBODIMENT 14)
`
`REALD INC.
`Exhibit 2186-27
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`'4"
`
`et"..
`
``"'
`
`REALD INC.
`Exhibit 2186-28
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.19C
`
`1963: S-POLARIZED LIGHT
`
`1964: COUNTERCLOCKWISE CIRCULARLY POLARIZED LIGHT
`
`1960: MIRROR PLATE
`
`1921, 1922: QUARTER-WAVE PLATES
`
`1962: CLOCKWISE CIRCULARLY POLARIZED LIGHT
`
`1961: P-POLARIZED LIGHT
`
`REALD INC.
`Exhibit 2186-29
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 28 of 45
`
`6,147,802
`
`1942: M1CROLENS
`
`1941: CONDENSER LENS PLATE
`
`,
`
`/ \
`
`,
`
`\
`
`/
`
`\
`
`f
`
`\
`
`/
`
`i
`
`/
`
`\
`
`T
`
`\
`
`\
`
`\
`
`/
`
`J
`
`,
`
`\
`
`C2: SECONDARY LIGHT SOURCE IMAGE Cl:
`FORMED FROM S-POLARIZED LIGHT
`
`SECONDARY LIGHT SOURCE IMAGE
`FORMED FROM P-POLARIZED LJGHT
`
`FIG.19D
`
`REALD INC.
`Exhibit 2186-30
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`t.4
`
`7-
`
`FIG.20
`
`1921: FIRST QUARTER-WAVE PLATE
`
`1912
`
`=90\
`
`MIRROR PLATE
`
`1901: FIRST CONDENSING
`
`1910
`
`L: SYSTEM 01311CAL AXIS
`
`1922: QUARTER-WAVE PLATE
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`402: POLARIZED LIGHT SPUTTING
`
`PORTION
`
`2001: DEVIATION PRISM
`
`1911
`
`412
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`426
`
`1910
`
`2000: POLARIZATION LUMINAIRE
`
`401: UGHT SOURCE PORTION
`
`411
`
`SYSTEM OPTICAL AXIS
`
`(EMBODIMENT 15)
`
`REALD INC.
`Exhibit 2186-31
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.21A
`
`1921: FIRST QUARTER-WAVE PLATE
`
`1912
`
`1913
`
`p=96
`
`WAVE PLATE
`
`1922: SECOND QUARTER-
`
`t.)
`
`§
`
`1-,
`
`z -
`
`.
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`402: POLARIZED LIGHT SPLITTING
`
`PORTION
`
`2001: DEVIATION PRISM
`
`1911
`
`412
`
`MIRROR PLATE
`2101: CONDENSING
`
`1910
`
`1941
`
`447
`
`446
`
`L: SYSTEM OPTICAL AXIS
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`426
`
`1910
`
`2100: POLARIZATION LUMINAIRE
`
`401: LIGHT SOURCE PORTION
`
`411
`
`SYSTEM OPTICAL AXIS --
`
`(EMBODIMENT 16)
`
`REALD INC.
`Exhibit 2186-32
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`U.S. Patent
`
`Nov. 14, 2000
`
`Sheet 31 of 45
`
`6,147,802
`
`2101: CONDENSING
`MIRROR
`RATE
`
`2103: BLOCK MADE
`OF GLASS
`
`2104: REFLECTION
`SURFACE
`
`2102: ENTRANCE
`SURFACE
`
`FIG. 21B
`
`REALD INC.
`Exhibit 2186-33
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.22
`
`FIRST QUARTER-WAVE PLATE
`
`1912
`
`=906
`
`MIRROR PLATE
`
`FIRST CONDENSING
`
`1910
`
`2001: DEVIATION PRISM
`
`1913
`
`PIATE
`
`1922: SECOND QUARTER-WAVE
`
`=90°
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`2001: DEVIATION PRISM
`PORTION
`
`402: POLARIZED UGHT SPUTTING
`1911
`
`412
`
`401: UGHT SOURCE PORTION
`
`411
`
`L: SYSTEM OPTICAL AXIS
`
`1941
`
`447
`
`446
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`1910
`
`426
`
`L'
`
`2200: POLARIZATION LUMINAIRE
`
`SYSTEM OPTICAL AXIS-,
`
`(EMBODIMENT 17)
`
`REALD INC.
`Exhibit 2186-34
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`1,4
`ot
`
`FIG.23
`
`1921. FIRST QUARTER-WAVE PLATE
`
`'
`
`2101: CONDENSING MIRROR PLATE
`
`2001: DEVIATION PRISM
`
`1912
`
`ß=90
`
`1910
`
`L: SYS1EM OPTICAL AXIS
`
`1922: SECOND QUARTER-WAVE
`
`PLATE
`
`2102: CONDENSING MIRROR PLATE
`
`ts.)
`
`2001: DEVIATION PRISM
`PORTION
`
`402: POLARIZED LIGHT SPLITTING
`
`1911
`
`412
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORIION
`
`426
`
`1910
`
`2300: POLARIZATION LUMINAIRE
`
`401: LIGHT SOURCE PORTION
`
`411
`
`SYSTEM OPTICAL AXIS
`
`(EMBODIMENT 18)
`
`REALD INC.
`Exhibit 2186-35
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`oc
`
`sp
`
`FIG.24
`
`1921: FIRST QUARTERWAVE PLATE
`
`2001: DEVIATION PRISM
`
`1912
`
`2101: CONDENSING MIRROR PLATE
`
`1910
`
`1913
`
`PLATE
`
`1922: SECOND QUARTERWAVE
`
`2102: CONDENSING MIRROR PLATE
`
`2001: DEVIATION PRISM
`PORTION
`
`402: POLARIZED LIGHT SPLIT-DIG
`
`1911
`
`412
`
`et
`
`401: UGHT SOURCE PORTION
`
`411
`
`L: SYSTEM OPTICAL AXIS
`
`1941
`
`447
`
`446
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`1910
`
`426
`
`L'
`
`2400: POLARIZATION LUMINAIRE
`
`SYSTEM OPTICAL AXIS
`
`(EMBODIMENT 19)
`
`REALD INC.
`Exhibit 2186-36
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`1921: FIRST QUARTERWAVE PLATE
`
`FIG.25
`
`MIRROR PLATE
`
`1901: RRST CONDENSING
`
`1912
`
`P
`
`2503
`
`1913
`
`1922: QUARTERWAVE PLATE
`
`P
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`402: POLARIZED LIGHT SPLITTING
`
`PORIION
`
`1911
`
`412
`
`2501
`
`L: SYSTEM OPTICAL AXIS
`
`LENS PLATE
`1941: CONDENSER
`
`1
`
`/i
`
`447
`
`\
`
`1
`
`---1i
`
`446: HALFWAVE PLATE
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`2502: POLARIZED LIGHT SPLITTING PLATE
`
`\
`
`401: LIGHT SOURCE PORTION
`
`%,.....
`
`(EMBODIMENT 20)
`
`SYSTEM OPTICAL AXIS., L'\411
`
`2500: POLARIZATION LUMINAIRE
`
`REALD INC.
`Exhibit 2186-37
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`921:FIRST QUARTER-WAVE PLATE
`
`FIG.26
`
`MIRROR PLATE
`
`1901: FIRST CONDENSING
`
`QUARTER-WAVE PLATE
`
`1922: SECOND
`
`MIRROR PLATE
`
`1902: SECOND CONDENSING
`
`402: POLARIZED LJGHT SPUTTING
`
`PORTION
`
`412
`
`401: LIGHT SOURCE PORTION
`
`411
`
`L: SYSTEM OPTICAL AXIS
`
`LENS PLATE
`1941: CONDENSER
`
`447
`
`446: HALF-WAVE PLATE
`
`404: REGION TO BE ILLUMINATED
`
`1940: CONDENSER LENS PORTION
`
`SYSTEM OPTICAL AXIS
`
`2600: POLARIZATION LUMINAIRE \426: POLARIZED LIGHT
`
`SPUTTING FILM
`
`(EMBODIMENT 21)
`
`REALD INC.
`Exhibit 2186-38
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG. 27
`
`1900
`
`2750
`
`2707r
`
`2708
`
`\;1.\. \if
`
`2709
`2710
`
`r-
`
`2715
`
`2711
`
`2713
`
`2706
`
`2704
`
`2705
`
`27142703
`
`2701
`
`270/2
`
`2700: PROJECTION DISPLAY
`
`REALD INC.
`Exhibit 2186-39
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG. 28
`
`2803
`
`2801
`
`2711
`
`2802
`
`2703
`
`2804
`
`2805
`
`2800: PROJECTION DISPLAY
`
`2715
`
`REALD INC.
`Exhibit 2186-40
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`412: PARABOLOIDAL REFLECTOR
`
`411: UGHT SOURCE LAMP
`
`L SYSTEM OPTICAL AXIS
`
`b.)
`
`R: LJGHT SOURCE OPTICAL AXIS
`
`FIG.29A
`
`2921: POLARIZING BEAM SPUTTER
`
`2903: POLARIZED UGHT SPUT11NG PRISM
`
`2951: HALF-WAVE RATE
`
`MIRROR
`
`2931
`
`2941
`
`2922: REFLECTION
`
`2910
`
`443
`
`2902
`
`404: REGION TO BE ILLU1AINATED
`
`2904: HALF-WAVE RATE
`
`2905: DLIT SIDE LENS
`
`401: LIGHT SOURCE PORTION
`
`441: FIRST LENS RATE
`
`2901: SECOND LENS PLATE
`
`2900: POLARIZATION LUMINAIRE
`
`(EMBODIMENT 22)
`
`REALD INC.
`Exhibit 2186-41
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG. 29B
`
`------.--FUNDAMENTALCOMPOSING ELEMENT
`
`Wp
`
`0
`
`11111
`
`ARRAY
`SPU111NG PRISM
`2903: POLARIZED LIGHT
`
`2921; POLARIZING BEAM SPUTTER
`
`iet#11PP"
`
`2931
`
`2941
`
`2922: REFLECTION MIRROR
`
`REALD INC.
`Exhibit 2186-42
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`3001: DEVIATION PRISM
`
`2903: POLARIZED UGHT SPUTTING PRISM ARRAY
`
`412: PARABOLOIDAL REFLECTOR
`
`2921: POLARIZING BEAM SPUTTER
`
`2951: HALF-WAVE PLA1E
`
`FIG.30
`
`411: UGHT SOURCE LAMP
`
`L: SYSTEM OPTICAL AXIS
`
`MIRROR
`
`2931
`
`2941
`
`2922: REFLECTION
`
`2910
`
`404: REGION TO BE ILLUMINATED
`
`2904: HALF-WAVE PLATE
`
`2905: EXIT SIDE LENS
`
`R: UGHT SOURCE OPTICAL AXIS
`
`443
`
`2902
`
`et
`
`401: UGHT SOURCE PORTION
`
`441: FIRST LENS PLATE
`
`2901: SECOND LENS PLATE
`
`3000: POIARIZATION LUMINAIRE
`
`(EMBODIMENT 23)
`
`REALD INC.
`Exhibit 2186-43
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.31
`
`2903: POLARIZED UGHT SPUTIING PRISM ARRAY
`
`412: PARABOLOIDAL REFLECTOR
`
`2921: POLARIZING BEAM SPUTTER
`
`2951: RALF-WAVE PLATE
`
`411: UGHT SOURCE LAMP
`
`L: SYSIEM OPIICAL AXIS
`
`IN)
`
`R: UGHT SOURCE OFrIICAL AXIS
`
`MIRROR
`
`2931
`
`2941
`
`2922: REFLECTION
`
`2910
`
`3101
`
`2902
`
`404: REGION TO BE ILLUMINATED
`
`2904: HALF-WAVE PLATE
`
`2905: EXIT SIDE LENS
`
`401: LIGHT SOURCE PORTION
`
`441: FIRST LENS PLATE
`
`2901: SECOND LENS PLATE
`
`3100: POLARIZATION LUMINAIRE
`
`(EMBODIMENT 24)
`
`REALD INC.
`Exhibit 2186-44
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`412: PARABOLOIDAL REFLECTOR
`
`411: MIT SOURCE LAMP
`
`L SYSTEM OPTICAL AXIS
`
`FIG.32
`
`2921: POLARIZING BEAM SPLITTER
`
`2903: POIARIZED UGHT SPLITTING PRISAI ARRAY
`
`2951: HALFWAVE PLATE
`
`MIRROR
`
`2931
`
`2941
`
`2922: REFUCTION
`
`3201
`
`404: REGION TO BE ILLUMINATED
`
`2904: HALFWAVE PLATE
`
`R: UGHT SOURCE OPTICAL AXIS
`
`404a
`
`443
`
`2902
`
`401: UGHT SOURCE PORTION
`
`441: FIRST LENS PLATE
`
`2901: SECOND LENS PLATE
`
`3200: POLARIZATION LUMINAIRE
`
`(DABODIMENT 25)
`
`REALD INC.
`Exhibit 2186-45
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.33
`
`2903: POLARIZED UGHT SPUTTING PRISM ARRAY
`
`412: PARABOLOIDAL REFLECTOR
`
`2921: POLARIZING BM/ SPUTTER
`
`411: UGHT SOURCE LAMP
`
`OPTICAL AXIS
`R: UGHT SOURCE
`
`MIRROR
`
`2931
`
`2941
`
`2922: REFLECTION
`
`3301
`
`-
`
`L: SYSTEM OPTICAL AXIS
`
`443
`
`12902
`
`CON
`shak
`13.1
`
`=-103
`11111
`/ha
`
`2951: HALF-WAVE PLATE
`
`2904: HALF-WAVE RATE
`
`2905: EXff SIDE LENS
`
`404: REGION TO BE ILLUMINATED
`
`401: LIGHT SOURCE PORTION
`
`441: FIRST LENS PIATE
`
`2901: SECOND LDS PLATE
`
`3300: POLARIZATION LUMINAIRE
`
`(EMBODIMENT 26)
`
`REALD INC.
`Exhibit 2186-46
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`FIG.34
`
`3408
`
`3407r-,__,3450
`
`3409
`3410
`
`3415
`
`3411
`
`3413
`
`3100
`
`NI
`
`3406
`
`S,
`
`Ns..
`
`/405
`
`1
`
`3403
`
`401
`
`441
`
`2901
`
`3401
`
`3402
`
`3414
`
`3400: PROJECTION DISPLAY
`
`REALD INC.
`Exhibit 2186-47
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`6,147,802
`
`POLARIZATION LUMINAIRE AND
`PROJECTION DISPLAY
`TECHNICAL FIELD
`The present invention relates to a polarization luminaire
`for uniformly illuminating a rectangular illumination area or
`the like with polarized light waves in which the polarization
`direction thereof is made to be uniform. Further, the present
`invention relates to a projection display for modulating 10
`polarized light, which has been emitted from this polariza-
`tion luminaire, by means of a light valve and for enlarging
`an image and displaying the image on a screen.
`
`5
`
`25
`
`35
`
`40
`
`45
`
`2
`integrator is oblong in the same manner as a rectangle or the
`like, it is preferable that a splitting direction, in which two
`lights split by the polarized light splitting means are sepa-
`rated from each other, is the direction of the length of the
`region.
`Further, it is desirable that the shape of each of the lenses
`composing the second lens plate of the system of the optical
`integrator is similar to that of each of the lenses composing
`the first lens plate.
`An element having a structure (namely, a liquid crystal
`structure), in which a liquid crystal layer is sandwiched
`between a prism substrate and a glass substrate and an
`interface between the liquid crystal layer and the prism
`substrate is formed as a multi-stage surface inclined at an
`15 angle of less than 90 degrees to the optical axis of the means,
`may be employed as the polarized light splitting means.
`A prism beam splitter, which is provided with a polarized
`light splitting film constituted by a dielectric multi-layer film
`and is adapted to split a polarized light emitted from the light
`source, whose polarization direction is random, into two
`kinds of polarized lights, whose polarization directions are
`perpendicular to each other, and is further adapted to emit
`the two kinds of polarized lights respectively in directions
`forming a deviation angle of less than 90 degrees, may be
`employed, instead of this element using a liquid crystal, as
`the polarized light splitting means.
`The following configurations can be employed as that of
`the prism beam splitter.
`A prism beam splitter having the following config-u-
`ration can be employed. This prism beam splitter has a flat
`quadrangular prism and a triangular prism whose inclined
`surface portion is joined to one of opposed side surface
`portions of the quadrangular prism. In a joint portion
`between the quadrangular prism and the triangular prism,
`the polarized light splitting film is formed. A reflection film
`for reflecting single kind of polarized lights, which is
`transmitted by the polarized light splitting film, in a prede-
`termined direction is formed on the other of the opposed side
`surface portions of the quadrangular prism
`As the aforementioned triangular prism, a triangular
`prism containing liquid can be employed.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a first
`flat quadrangular prism and a second flat quadrangular prism
`whose side surface portion is joined to one of opposed side
`surface portions of the first quadrangular prism. In a joint
`portion between the first and second quadrangular prisms,
`the polarized light splitting film is formed. A reflection film
`for reflecting single kind of polarized lights, which is
`transmitted by the polarized light splitting film, in a prede-
`termined direction is formed on the other of the opposed side
`surface portions of the first quadrangular prism.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a flat
`quadrangular prism and a plurality of triangular prisms
`whose inclined surface portions are joined to one of opposed
`side surface portions of the quadrangular prism. In a joint
`portion between the quadrangular prism and the triangular
`prisms, the polarized light splitting film is formed. A reflec-
`tion film for reflecting single kind of polarized lights, which
`is transmitted by the polarized light splitting film, in a
`predetermined direction is formed on the other of the
`opposed side surfac,e portions of the quadrangular prism.
`As the triangular prism described hereinabove, a triangu-
`lar prism containing liquid can be employed.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a first
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`BACKGROUND ART
`Hitherto, a system of the optical integrator using two lens
`plates has been known as an optical system for uniformly
`illuminating a rectangular illumination area of a liquid
`crystal light valve or the like. The system of the optical
`integrator is disclosed in, for example, Japanese Patent 20
`Public Disclosure No. 341806/1991 Official Gazette and
`has already been put to practical use.
`Ordinary projection displays, which use liquid crystal
`light valves of the type adapted to modulate polarized light,
`can utilize only single kind of polarized light. It is, therefore,
`important for obtaining a light projected image to enhance
`the utilization efficiency of light.
`An object of the present invention is to propose a lumi-
`naire suitable for using in a projection display or the like,
`which uses a liquid crystal light valve of the type adapted to
`modulate polarized light, as an illuminating system.
`More particularly, the object of the present invention is to
`propose a polarization luminaire that is provided with a
`system of the optical integrator and a polarization conver-
`sion system and can efficiently utilize polarized light and
`further can achieve uniform illumination Furthermore,
`another object of the present invention is to propose a
`projection display provided with this newly proposed polar-
`ization luminaire
`DISCLOSURE OF THE INVENTION
`A polarization luminaire of the present invention has: a
`light source for emitting polarized lights whose polarization
`directions are random; and a system of the optical integrator
`that is provided with a first lens plate consisting of a plurality
`of lenses and with a second lens plate consisting of a
`plurality of lenses. The polarized light radiated from the
`light source is projected on the entrance plane of each of the
`lenses of the second lens plate through the first lens plate in
`such a manner as to form a secondary light source image
`thereon. Further, an object is radiated with light emitted
`from the second lens plate. This polarization luminaire of the
`present invention further has: polarized light splitting means
`for splitting a light emitted from the light source into two
`kinds of polarized lights whose polarization directions are
`perpendicular to each other and whose traveling directions
`are apart from each other by an angle of less than 90 degrees;
`and polarization conversion means for causing the two kinds
`of polarized lights to have the same polarization direction.
`Moreover, this polarization luminaire of the present inven-
`tion employs a configuration in which the polarized light
`splitting means is placed on one of an entrance side and an
`exit side of the first lens plate of the system of the optical
`integrator.
`Here, note that in the case where a region illuminated with
`polarized light emitted from the system of the optical
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`55
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`60
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`65
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`REALD INC.
`Exhibit 2186-48
`MASTERIMAGE 3D, et al. v REALD INC.
`IPR2015-00035
`
`

`
`6,147,802
`
`triangular prism, on the inclined surface of which the
`polarized light splitting film is formed, and a second trian-
`gular prism, on the inclined surface of which a reflection
`film for reflecting single kind of polarized lights, which is
`transmitted by the polarized light splitting film, in a prede-
`termined direction is formed. While the first and second
`triangular prisms are in a state in which the space therebe-
`tween is filled with liquid, the first and second triangular
`prisms are formed in such a manner as to be integral with
`each other.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a
`plurality of quadrangular-prism-like prism composite
`elements, each of which has: a flat quadrangular prism; a
`first triangular prism whose inclined surface portion is
`joined to one of opposed side surface portions of the
`quadrangular prism; and a second triangular prism whose
`inclined surface portion is joined to the other of the opposed
`side surface portions of the quadrangular prism. In each of
`the prism composite elements, the polarized light splitting
`film is formed in the joint portion between the quadrangular
`prism and the first triangular prism, and a reflection film is
`formed in the joint portion between the quadrangular pnism
`and the second triangular prism. The prism composite ele-
`ments are aligned in a line in a direction perpendicular to the
`optical axis of the system of the optical integrator in such a
`way that the polarized light splitting films become parallel.
`The reflection film reflects to output the randomly-polarized
`light having been emitted from the light source portion to the
`next prism on one side, and reflects the polarized light which
`is transmitted by the polarized light splitting film formed in
`the same prism composite element in a predetermined
`direction on the other side.
`In this case, the prism composite elements are set in such
`a manner that the polarized light splitting films are inclined
`at about 45 degrees to the optical axis of the system of the
`optical integrator.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a
`plurality of quadrangular-prism-like prism composite
`elements, in each of which the polarized light splitting film
`is formed. The prism composite elements are aligned in a
`line in a direction perpendicular to the optical axis of the
`system of the optical integrator in such a way that the
`polarized light splitting films extends nearly in the same
`direction.
`A prism beam splitter having the following configu-
`ration can be employed. This prism beam splitter has a
`plurality of quadrangular-prism-like prism composite
`elements, in each of which the polarized light splitting film
`is formed. The prism composite elements are aligned in a
`line in a direction perpendicular