Prism sheet
First Claim
1. A prism sheet having arranged on one side a plurality of substantially triangular prism-shaped lens units with their longitudinal axes almost parallel to each other and having a roughened surface on the other side, and with 100 assigned as a reference characteristic value for each of glossiness. reflective ability and friction coefficient when said other side is smooth, said characteristic value is not less than 50 in glossiness, not more than 70 in internal reflective ability, and not more than 70 in friction coefficient when the side containing the lens units is in contact with a roughened surface of another prism sheet which is identical to said roughened surface on said other side of said prism sheet.
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Accused Products
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.
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Citations
4 Claims
- 1. A prism sheet having arranged on one side a plurality of substantially triangular prism-shaped lens units with their longitudinal axes almost parallel to each other and having a roughened surface on the other side, and with 100 assigned as a reference characteristic value for each of glossiness. reflective ability and friction coefficient when said other side is smooth, said characteristic value is not less than 50 in glossiness, not more than 70 in internal reflective ability, and not more than 70 in friction coefficient when the side containing the lens units is in contact with a roughened surface of another prism sheet which is identical to said roughened surface on said other side of said prism sheet.
Specification