Screen, Fresnel lens sheet used for the same, and image...

Details Screen, Fresnel lens sheet used for the same, and image... Screen, Fresnel lens sheet used for the same, and image...

2008-07-22

2008-07-22

Lee, Diane I. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S454000, C353S033000, C353S034000, C353S038000, C353S081000

Reexamination Certificate

active

07403335

ABSTRACT:
The present invention provides a screen suitable for reducing the longitudinal dimension of a set. The present invention includes two prism sections. One is a totally reflective prism section (10) provided at the image generation source side of a Fresnel lens sheet (6). The other is a refractive prism section (11) provided at the image-watching side of the Fresnel lens sheet. The refractive prism section (11) includes a refractive face (e) for refracting incident light and making the light exit toward the image-watching side, a plane (f) approximately parallel to the principal plane of the Fresnel lens sheet, and a connection face (g) for continuously forming the face (e) and the plane (f).

REFERENCES:
patent: 6292295 (2001-09-01), Yamashita et al.
patent: 6804055 (2004-10-01), Peterson et al.
patent: WO 02/27399 (2002-04-01), None

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