Patent ID: 8678629

Claim:
A lamp unit for a vehicular headlamp, comprising: a projection lens that is arranged so as to have an optical axis extending in a vehicle longitudinal direction; a light-emitting element that is a light source and that is arranged on a rear side with respect to a rear focal point of the projection lens; a reflector that is formed so that a longitudinal section of the reflector has an elliptical shape that includes at least part of an ellipse having a first focal point at a center of light emission of the light-emitting element and a second focal point at the rear focal point of the projection lens, wherein the reflector is arranged so as to cover the light-emitting element and reflects irradiated light toward the projection lens, the irradiated light being light irradiated from the light-emitting element, and wherein a major axis of the ellipse, passing through the first focal point and the second focal point is inclined with respect to the optical axis; the major axis of the ellipse is inclined so that the first focal point is located on an upper side with respect to the second focal point, and a direction of light irradiated from the light emitting element is directed downward; the major axis of the ellipse is inclined downward toward a front of the lamp unit; wherein the light-emitting element is arranged so that an axis of light irradiated perpendicularly to the top surface of the light emitting element passes through an intersection of the optical axis and the reflector, the top surface of the light-emitting element facing forward and downward.