Optical: systems and elements – Diffusing of incident light
Patent
1995-11-15
1998-12-01
Shafer, Ricky D.
Optical: systems and elements
Diffusing of incident light
359831, 359837, 362 31, 362331, 362339, G02B 502, G02B 504, F21V 704
Patent
active
058447202
ABSTRACT:
A prism sheet having a plurality of substantially triangular prism-shaped lens units with their longitudinal axes almost parallel to each other arranged on one side and having the other side roughened, and with a characteristic value of 100 when said roughned side is smooth, the characterstic values are not less than 50 in glossiness, not more than 70 in internal reflective ability, and not more than 70 in friction coefficient when the plane including the prism peaks is rubbed by the roughened surface. The prism sheet of the present invention is therefrom free from interference fringes, substantially safe from scratching and uniform and high in brightness, being thus useful for liquid crystal devices etc.
REFERENCES:
patent: 5122709 (1992-06-01), Kawamura et al.
patent: 5289351 (1994-02-01), Kashima et al.
patent: 5394255 (1995-02-01), Yokota et al.
patent: 5592332 (1997-01-01), Nishio et al.
patent: 5598280 (1997-01-01), Nishio et al.
Kawaguchi Osamu
Kawashima Kenji
Kosugi Takumi
Ohara Shuzo
Taen Tetsuro
GOYO Paper Working Co., Ltd.
Shafer Ricky D.
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