초록 ▼

This relates to a system for and method of illuminating a sign, so that drivers and observers may easily recognize and read the sign and billboard. The apparatus employs an external illumination source that is easy to inspect and maintain. The illumination source and the sign or billboard are separa

This relates to a system for and method of illuminating a sign, so that drivers and observers may easily recognize and read the sign and billboard. The apparatus employs an external illumination source that is easy to inspect and maintain. The illumination source and the sign or billboard are separately installed from each other. Light emitted from the illumination source forms an incident angle (.theta.) in the range of 0.degree. to about 30.degree. at any point on the road sign. A road sign area of the sign is made of a retroreflective sheet having a wide observation angle.

대표청구항 ▼

[ What is claimed:] [1.] A sign illumination system comprising a sign having a sign face and an illumination source, said illumination source emitting light that is incident to said sign face at an incidence angle in the range of about 0.degree. to about 30.degree., said sign face comprising retrore

[ What is claimed:] [1.] A sign illumination system comprising a sign having a sign face and an illumination source, said illumination source emitting light that is incident to said sign face at an incidence angle in the range of about 0.degree. to about 30.degree., said sign face comprising retroreflective portions.