Sign illumination system and method
First Claim
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°
- to about 30°
, said sign face comprising retroreflective portions.
1 Assignment
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Accused Products
Abstract
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 (θ) in the range of 0° to about 30° 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.
56 Citations
11 Claims
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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°
- to about 30°
, said sign face comprising retroreflective portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- to about 30°
-
10. A method of illuminating a sign having a sign face comprising retroreflective portions, said method comprising the step of positioning an illumination source relative to the sign face to efficiently utilize the wide observation angle while not blocking a view of an observer of any retroreflective point on the sign board, and causing the illumination source to emit light that forms an incident angle in the range of 0°
- to about 30°
at any point on the road sign. - View Dependent Claims (11)
- to about 30°
Specification