Patent ID: 8905607
Filing Date: 2014-12-09
Classification: B60Q,F21S,F21W

Abstract:
1. A vehicle headlight configured to form a prescribed light distribution pattern on a virtual vertical screen in front of a vehicle body, the vehicle headlight having an optical axis extending in a front-to-rear direction and comprising: a projection lens disposed on the optical axis and having a rear-side focal point; and a light source disposed substantially at the rear-side focal point, wherein: the light distribution pattern includes a central area of an illumination area including an intersection between a horizontal center line and a vertical center line on the virtual vertical screen, and peripheral areas located on either side of the central area; the light source includes a plurality of white LEDs with respective light emission surfaces directed toward the projection lens and disposed in a horizontal direction perpendicular to the optical axis so that the rear-side focal point of the projection lens is disposed at a substantial center of the plurality of white LEDs; the plurality of white LEDs include a first white LED disposed at a center with respect to the horizontal direction and configured to emit light for illuminating the central area, and a second white LED configured to emit light for illuminating the peripheral areas; and the first white LED has an S/P ratio, which is represented by (S(λ)*V′(λ))/(S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than an S/P ratio of the second white LED.