US 7,126,736 B2Granted

Illumination device, display device and projector

AssigneeSeiko Epson Corporation

InventorsYoshitaka Itoh, Hideki Kojima

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Abstract

A projector capable of displaying a moving picture image in good quality with a clear outline and few blurs includes a light source, a pseudo rectangular light flux generating device to generate a band-shaped illumination light flux from a light flux emitted from the light source, and an optically scanning device to scan with the illumination light flux emitted from the pseudo rectangular light flux generating device on an optically modulating apparatus. The projector further includes an illumination light flux shaping device to shape the illumination light flux into a desired shape of illumination light flux, the illumination light flux shaping device being in an optical path of the illumination light flux emitted from the pseudo rectangular light flux generating device.

Claims12

Dependent claims

An illumination device to location-selectively scan and radiate an illumination light flux formed into the shape of a band on an optically modulating apparatus, the optically modulating apparatus having a holding display mode, the illumination device comprising:

a light source emitting a light flux;
a pseudo rectangular light flux generating device to generate a band-shaped illumination light flux from the light flux emitted from the light source, the band-shaped illumination light flux defining an optical path;
and
an optically scanning device to scan the illumination light flux emitted from the pseudo rectangular light flux generating device on the optically modulating apparatus;
and
an illumination light flux shaping device, disposed in the optical path, to shape the illumination light flux into a desired shape;
wherein the illumination device scans and radiates synchronously with a writing operation of the optical modulating apparatus.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/131,299Filed 18 May 2005
Priority: JP 2004-14918519 May 2004
Published: US 2005/0259308 A124 Nov 2005
Granted: 24 Oct 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G02B 27/0961
Lenses: lens arrays
G02B 27/0905
Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for: dividing and/or superposing multiple light beams
G02B 27/0933
Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for: systems for active beam shaping by rapid movement of an element
G02B 27/0988
Using specific optical elements: diaphragms, spatial filters, masks for removing or filtering a part of the beam