WO1998031143A3 - Illumination system for an image projection device - Google Patents

Illumination system for an image projection device Download PDF

Info

Publication number
WO1998031143A3
WO1998031143A3 PCT/IB1998/000011 IB9800011W WO9831143A3 WO 1998031143 A3 WO1998031143 A3 WO 1998031143A3 IB 9800011 W IB9800011 W IB 9800011W WO 9831143 A3 WO9831143 A3 WO 9831143A3
Authority
WO
WIPO (PCT)
Prior art keywords
beams
radiation
sub
illumination system
polarizing
Prior art date
Application number
PCT/IB1998/000011
Other languages
French (fr)
Other versions
WO1998031143A2 (en
Inventor
Vaan Adrianus Johannes Step De
Original Assignee
Koninkl Philips Electronics Nv
Philips Norden Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB9700403A priority Critical patent/GB2321143B/en
Application filed by Koninkl Philips Electronics Nv, Philips Norden Ab filed Critical Koninkl Philips Electronics Nv
Priority to EP98900010A priority patent/EP0916221A2/en
Priority to JP10529159A priority patent/JP2000507006A/en
Priority to PCT/IB1998/000011 priority patent/WO1998031143A2/en
Priority to PCT/US1998/000311 priority patent/WO1998031105A1/en
Publication of WO1998031143A2 publication Critical patent/WO1998031143A2/en
Publication of WO1998031143A3 publication Critical patent/WO1998031143A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Abstract

The invention relates to an illumination system (21) for supplying a polarized radiation beam. The illumination system (21) successively comprises a radiation source unit (3) for supplying at least one radiation beam and an optical system for concentrating the radiation to a beam, a polarizing system (11) for splitting a radiation beam (bI, bII) generated by the radiation source unit (3) into linearly polarized sub-beams, and at least one polarization-rotating element (35). The polarizing system comprises at least one optically transparent plate (11) having a refractive index n0 and a first face and a second face. At least one of these faces is provided with an optically thin layer having a refractive index n1 which is larger than n0. The light path of the sub-beams whose directions of polarizations are not to be converted incorporates a reflector (41, 43) for reflecting the sub-beams into the same direction of propagation as that of the other sub-beams. The chief ray of these beams and the normal on the plate (11) enclose an angle which is substantially equal to the Brewster angle which holds for the interface between the optically thin layer and a medium surrounding the polarizing element (11). The radiation source unit (3) comprises two radiation sources (23, 25), and such a polarizing system is associated with each radiation source (23, 25). The invention also relates to an image projection device (45) comprising such an illumination system (21).
PCT/IB1998/000011 1997-01-10 1998-01-07 Illumination system for an image projection device WO1998031143A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9700403A GB2321143B (en) 1997-01-10 1997-01-10 Delta sigma analog-to-digital converter
EP98900010A EP0916221A2 (en) 1997-01-10 1998-01-07 Illumination system for an image projection device
JP10529159A JP2000507006A (en) 1997-01-10 1998-01-07 Irradiation system for image projection equipment
PCT/IB1998/000011 WO1998031143A2 (en) 1997-01-10 1998-01-07 Illumination system for an image projection device
PCT/US1998/000311 WO1998031105A1 (en) 1997-01-10 1998-01-09 Delta sigma analog-to-digital converter

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97200069 1997-01-10
EP97200069.9 1997-01-10
PCT/IB1998/000011 WO1998031143A2 (en) 1997-01-10 1998-01-07 Illumination system for an image projection device

Publications (2)

Publication Number Publication Date
WO1998031143A2 WO1998031143A2 (en) 1998-07-16
WO1998031143A3 true WO1998031143A3 (en) 1998-10-01

Family

ID=26146047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/000011 WO1998031143A2 (en) 1997-01-10 1998-01-07 Illumination system for an image projection device

Country Status (2)

Country Link
EP (1) EP0916221A2 (en)
WO (1) WO1998031143A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011414A1 (en) * 1999-08-06 2001-02-15 Kaiser Aerospace And Electronics Corporation Dual projector lamps
US9335336B2 (en) 2011-09-09 2016-05-10 Gen-Probe Incorporated Automated sample handling instrumentation, systems, processes, and methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4638309A (en) * 1983-09-08 1987-01-20 Texas Instruments Incorporated Spatial light modulator drive system
US5098184A (en) * 1989-04-28 1992-03-24 U.S. Philips Corporation Optical illumination system and projection apparatus comprising such a system
EP0576071A1 (en) * 1992-06-23 1993-12-29 Koninklijke Philips Electronics N.V. High pressure mercury discharge lamp
WO1996005534A1 (en) * 1994-08-09 1996-02-22 Philips Electronics N.V. Illumination system for supplying a polarized radiation beam, and image projection device comprising such an illumination system
WO1997037266A1 (en) * 1996-03-29 1997-10-09 Minnesota Mining And Manufacturing Company Polarized illumination system for lcd projector
WO1998015855A1 (en) * 1996-10-08 1998-04-16 Corning Incorporated Converter of natural white light into light with planar polarization

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4638309A (en) * 1983-09-08 1987-01-20 Texas Instruments Incorporated Spatial light modulator drive system
US5098184A (en) * 1989-04-28 1992-03-24 U.S. Philips Corporation Optical illumination system and projection apparatus comprising such a system
EP0576071A1 (en) * 1992-06-23 1993-12-29 Koninklijke Philips Electronics N.V. High pressure mercury discharge lamp
WO1996005534A1 (en) * 1994-08-09 1996-02-22 Philips Electronics N.V. Illumination system for supplying a polarized radiation beam, and image projection device comprising such an illumination system
WO1997037266A1 (en) * 1996-03-29 1997-10-09 Minnesota Mining And Manufacturing Company Polarized illumination system for lcd projector
WO1998015855A1 (en) * 1996-10-08 1998-04-16 Corning Incorporated Converter of natural white light into light with planar polarization

Also Published As

Publication number Publication date
EP0916221A2 (en) 1999-05-19
WO1998031143A2 (en) 1998-07-16

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