US 2006/0033009 A1 · Displaying optical system and image projection apparatus

Abstract

A displaying optical system is disclosed, which is capable of reducing a speckle noise. The displaying optical system comprises a light source emitting coherent light, a scanning device scanning the light, a first optical system causing the light from the scanning device to form an intermediate image, a second optical system causing the light from the intermediate image to form an image on a real display surface, and an optical element arranged between the first and second optical systems. The optical element widens the divergence angle of the light emerged from the optical element toward the second optical system more than the incident angle of the light on the optical element from the first optical system.

Claims24

Dependent claims

A displaying optical system comprising:

a light source which emits modulated coherent light;
a scanning device which scans the light;
a first optical system which causes the light from the scanning device to form an intermediate image;
a second optical system which causes the light from the intermediate image to form an image on a real display surface;
and
an optical element arranged between the first and second optical systems, the optical element widening the divergence angle of the light emerged from the optical element toward the second optical system more than the incident angle of the light on the optical element from the first optical system.

3 more elements

Dependencies are inferred from the claim text.

Displaying optical system and image projection apparatus

Life of this patent

Displaying optical system and image projection apparatus

Life of this patent

Abstract

Claims24