| 摘要 |
<p>A high aspect ratio passing beam headlamp has a body provided with front opening and a rear opening which is displaced below the horizontal median line of the headlamp. Within the body is a pair of lateral curved reflective portions and separated by an upper curved reflective portion. The foci of the reflective portions are coincident. A bulb is mounted in the rear opening. A U-shaped bulb filament shield rests against a lower planar portion of the body and has arms which provide a horizontal cut-off on both sides of the bulb. The lateral curved reflective portions and have their optical axes mutually inclined in both the horizontal and vertical directions such that the beam pattern projected by the reflector from the shielded filament has, at 25 meters from the headlamp, a lower beam portion having a horizontal upper cut-off, an intermediate beam portion having an upwardly inclined cut-off extending from one side of the upper off the lower beam portion, and an upper beam portion having a horizontal upper cut-off extending from the inclined cut-off on the opposite side thereof to the lower beam portion, the lower beam portion being provided by one of the curved reflective portions and the intermediate and upper beam portions being provided by the other of the curved reflective portions.</p> |
