Lenticular lens sheet and projection screen

Details Lenticular lens sheet and projection screen Lenticular lens sheet and projection screen

2006-09-12

2006-09-12

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S459000, C359S621000, C348S059000

Reexamination Certificate

active

07106506

ABSTRACT:
A high contrast lenticular lens sheet that can improve the brightness of an image and the angle of visibility. When it is assumed that P represents the pitch of the lens element and H represents the width of the black stripe portion as viewed in a cross section perpendicular to the lens element, the difference F in height between the black stripe portion and the lens element is set to have a range that is expressed by the inequality:in-line-formulae description="In-line Formulae" end="lead"?0.098P≦F≦(P−H)/2 tan(π/3).in-line-formulae description="In-line Formulae" end="tail"?Simultaneously, the width B as measured from an apex portion of the black stripe portion in regard to a colored portion on a side wall of the black stripe portion is set to have a range that is expressed by the inequality:in-line-formulae description="In-line Formulae" end="lead"?0.30F≦B≦0.89F.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6384970 (2002-05-01), Abe et al.
patent: 2004/0012850 (2004-01-01), Takahashi et al.

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