Double-sided lens sheet and projection screen

Details Double-sided lens sheet and projection screen Double-sided lens sheet and projection screen

2006-08-08

2006-08-08

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S457000, C359S619000, C359S449000, C359S451000, C359S452000

Reexamination Certificate

active

07088508

ABSTRACT:
In order to provide a dual-surface lens sheet in which a color shift is reduced and positions of unit lenses on a front surface and a back surface are easily aligned even if the unit lenses are disposed in fine pitch when used for a rear projection screen which is used for a display device using a plurality of projector as light sources, a half-column-cylindrical-convex-lens is used in a lens sheet having lens sections on front surface and a back surface such that pitch ratio for disposing the unit lenses on the front surface and the back surface is in a range of 1:2 to 1:30 and disposition directions of the lens sections are uniform.

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