Reflection screen and front projection system
AssigneeDai Nippon Printing Co., Ltd.
InventorMasahiro Goto
Life of this patent
Estimating the term…
Abstract
A reflection screen includes a light transmittable base portion and a reflecting portion. The reflecting portion is arranged on two rear side of the base portion and has a reflecting surface. Either the base portion or the reflecting portion has the shape of a Fresnel lens, which has an optical center located toward a light source from a geometrical center of the screen.
Claims19
A planar-shaped reflection screen for reflecting projected image light from a light source arranged outside the periphery of the reflection screen, the reflection screen comprising:
- a light transmittable base portion having an observed-side surface on the side of an observer;
- and
- a reflecting portion arranged on a rear side of the base portion and having a reflecting surface;
- wherein said reflecting portion comprises the shape of a Fresnel lens having an optical center located off the screen between said light source and a geometrical center of the screen.
A front projection system, comprising:
- a planar-shaped reflection screen;
- a light source arranged outside the periphery of the reflection screen for irradiating projected image light on the reflection screen;
- and
- said reflection screen comprising a light transmittable base portion having an observed-side surface on the side of an observer, and a reflecting portion arranged on a rear side of the base portion and having a reflecting surface, wherein said reflecting portion comprises the shape of a Fresnel lens having an optical center located off the screen between said light source and a geometrical center of the screen.
A planar-shaped reflection screen for reflecting projected image light from a light source arranged outside the periphery of the reflection screen, the reflection screen comprising:
- a light transmittable base portion having an observed-side surface on the side of an observer;
- and
- a reflecting portion arranged on a rear side of the base portion and having a reflecting surface;
- wherein the reflecting portion comprises the shape of a Fresnel lens having an optical center located between said light source and a geometrical center of the screen.
A front projection system, comprising:
- a planar-shaped reflection screen;
- a light source arranged outside the periphery of the reflection screen for irradiating projected image light on the reflection screen;
- and
- said reflection screen comprising a light transmittable base portion having an observed-side surface on the side of an observer, and a reflecting portion arranged on a rear side of the base portion and having a reflecting surface, wherein said reflecting portion comprises the shape of a Fresnel lens having an optical center located between said light source and a geometrical center of the screen.
Dependencies are inferred from the claim text.