| 摘要 |
A light-pipe 1 for illuminating a display area (e.g., instrument panel) comprises an arcuate tubular pipe 4 made of optically-transmitting material, the pipe having an inner 8 and outer 10 surface portion diametrically opposite each other, with each surface portion having a series of notches 14, 16. Each notch / slit / groove on the light-pipe is spaced from another by a smooth surface region 18. Each notch series is off-set / staggered from that on the opposite side, each notch being V-shaped, and orientated such that a line bisecting a notch passes through an apex of the notch and through the opposing smooth surface. The light-guide may have a first end 2 for being illuminated, and a second end 26 having an un-notched portion (finger 22, fig.3). Ideally the light-guide is Y-shaped, and is used to illuminate a vehicle instrument dial. Light emitted from the opposite sides of the light-tube may respectively illuminate inner and outer concentric instrument dials. |
