Lenticular lens sheet for use in rear projection television

Details Lenticular lens sheet for use in rear projection television Lenticular lens sheet for use in rear projection television

1997-03-21

1999-03-30

Metjahic, Safet

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

G03B 2160

Patent

active

058896139

ABSTRACT:
A lenticular lens sheet for a rear projection television, which exhibits smooth color change and has a wide viewing angle even in a television set having a large convergence angle. A group of vertical straight-line shaped entrance-side lens surfaces are provided on an entrance side I of the lenticular lens sheet. Each entrance-side lens surface has a cross-section defined approximately by a part of an ellipse, and satisfies the condition of 2.5.ltoreq.bp/a.sup.2 .ltoreq.3.0, where b is the major axis of the ellipse; a is the minor axis of the ellipse; and p is the width of each entrance-side lens surface. A group of vertical straight-line shaped exit-side lens surfaces are provided on an exit side O of the lenticular lens sheet. Each exit-side lens surface has a cross-section defined approximately by a part of an ellipse, and satisfies the condition of 0.55.ltoreq.b/(a.sup.2 .phi.).ltoreq.0.75, where .phi. is a convergence angle formed by two adjacent projection tubes. A light-absorbing layer BS is provided on each light-blocking portion. The thickness L of the lenticular lens sheet from the bottom of the entrance-side lens surface I to the vertex of the exit-side lens surface O is set so that light entering the lens through the bottom of the entrance-side lens surface I intersects the center axis outside the exit-side lens surface O.

REFERENCES:
patent: 4936652 (1990-06-01), Clausen et al.
patent: 5071224 (1991-12-01), Yokoo
patent: 5400114 (1995-03-01), Yoshida et al.
patent: 5661600 (1997-08-01), Mitani et al.
patent: 5687024 (1997-11-01), Yoshimura et al.
Patent Abstracts of Japan vol. 014, No. 474 (P-1117), Oct. 16, 1990, & JP 02 190835 A (Kyowa Gas Chem Ind Co Ltd), Jul. 26, 1990, *Abstracts.

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