ILLUMINATION DEVICE AND IMAGE PROJECTION APPARATUS

Title:

ILLUMINATION DEVICE AND IMAGE PROJECTION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2016/132706

Kind Code:

A1

Abstract:

This invention is concerning an illumination device that can obtain illumination light efficiently. An illumination device 1 used in, for example, a projection display apparatus includes a light source and a light tunnel 14. The light tunnel 14 includes a light incident port 15, a light emission port 16, a light guide path 17, a reflection surface 20 surrounding the light guide path 17, a phosphor layer 19 that generates fluorescent light LF having a different wavelength range from that of excitation light LE when being excited by the excitation light LE, a condensing optical system 13 that diverges the excitation light LE in the vicinity of the light incident port 15 and guides the diverged light into the light tunnel 14 to irradiate the phosphor layer 19, and a wavelength selection element that reflects the fluorescent light LF toward the light emission port 16.

Inventors:

FUJITA KAZUHIRO (JP)
KADO TAKAHIRO (JP)

Application Number:

PCT/JP2016/000652

Publication Date:

August 25, 2016

Filing Date:

February 09, 2016

Export Citation:

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Assignee:

RICOH CO LTD (JP)
FUJITA KAZUHIRO (JP)
KADO TAKAHIRO (JP)

International Classes:

G03B21/14; F21S2/00; F21V7/00; F21V7/09; F21V7/22; F21V8/00; F21V29/70; G02F1/13; G03B21/00; G03B21/16; H04N5/74; F21Y115/10

Foreign References:

JP2012069387A	2012-04-05
US20080232084A1	2008-09-25
JP2011203597A	2011-10-13
JP2014240912A	2014-12-25
JP2012063567A	2012-03-29
JP2007004200A	2007-01-11
JP2014089462A	2014-05-15
JP2014010181A	2014-01-20
JP2013094496A	2013-05-20
US20070165186A1	2007-07-19

Other References: