Lenticular lens sheet

Details Lenticular lens sheet Lenticular lens sheet

1998-08-21

2000-12-05

Ben, Loha

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

359620, G02B 2710

Patent

active

061574910

ABSTRACT:
A lenticular lens sheet for use as a rear-projection screen, comprises a body sheet; back lenses having a substantially elliptic cross section and formed in a back surface of the body sheet; front lenses formed in a front surface of the body sheet at the focal points of the back lenses or in the vicinity thereof; and a light absorbing layer formed on sections of the front surface at the non-focal points of the back lenses. Pitches p of the back and the front lenses, and thickness t of the lenticular lens sheet equal to distance between a plane in contact with the back lenses and a plane in contact with the front lenses meet an inequality: 1.1.ltoreq.t/p.ltoreq.1.4, and conic coefficient k of a conic section defining the cross section of the back lenses is in the range of -0.5 to -0.4.

REFERENCES:
patent: 5422285 (1995-06-01), Ishibe
patent: 5568313 (1996-10-01), Steenblik et al.
patent: 5581407 (1996-12-01), Mitani et al.
patent: 5636056 (1997-06-01), Itonaga et al.
patent: 5642226 (1997-06-01), Rosenthal

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