FLEXIBLE LIGHT-RETURNING MATERIAL Russian patent published in 2002 - IPC

FIELD: optical engineering. SUBSTANCE: material has light-returning structure with flat external surface and a set of additional light-returning members which apices are directed towards back side of the light-returning structure. The basic light-returning members are manufactured as single type of light-returning structures having sharp and/or rounded tip. The additional light-returning members are greater in height than the basic light-returning members. The additional light-returning members are designed as at least one light-returning structure with sharp or rounded tip which supporting apices are covered with temporary anti-adhesive paper, or with substrate, or with substrate having anti-adhesive paper fixed on the external surface. EFFECT: uniform and stable light-returning action. 35 cl, 9 dwg