Runway sign having a replaceable single LED lamp

摘要

A two-sided airfield runway sign with direct illumination by a single LED lamp. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

主权项

1. A two-sided airport runway sign (10), comprising:
a rectangular, translucent front face (11), a rectangular, translucent rear face (11) generally parallel to the front face (11) and longitudinally separated from the front face (11) by first and second longitudinal edges (17, 16), the front and rear faces (11) and the first and second longitudinal edges (17, 16) bounding an interior volume of the runway sign (10); and a single LED lamp (1) being electrically energized in operational use, the LED lamp (1) being disposed proximate the first longitudinal edge (17) of the interior volume, the LED lamp (1) being selectively removable from and replaceable into the runway sign (10), the LED lamp (1) having a plurality of spaced LEDs (2); wherein the energized LED lamp (1) provides direct illumination to both the front and rear faces (11) simultaneously along a direct optical path between the lamp (1) and the front and rear faces (11) that is unobstructed by interaction with any further optical element; and wherein the interior volume that is spaced away from both said single LED lamp (1) and said front and rear faces (11) is devoid of a diffuser (130) optically adjacent the LED lamp (1).