Patent ID: 8246227
Filing Date: 2012-08-21
Classification: F21S,F21V,F21Y

Abstract:
1. A vehicle headlamp, comprising: (i) a fixed reflector having a reflecting surface made of a parabola-based free curved face; (ii) a movable reflector having a reflecting surface made of a parabola-based free curved face; (iii) a semiconductor-type light source having a light emitting chip; (iv) a holder by which the movable reflector is rotatably mounted around a horizontal axis passing through a center of the light emitting chip or proximity thereof; and (v) a drive unit for rotating the movable reflector around the horizontal axis among a first location, a second location, and a third location, wherein: a reference focal point of the reflecting surface of the fixed reflector and a reference focal point of the reflecting surface of the movable reflector are coincident or substantially coincident with each other and is positioned at the center of the light chip or proximity thereof; a reference focal axis of the reflecting surface of the fixed reflector and a reference focal axis of the reflecting surface of the movable reflector are coincident or substantially coincident with each other and are orthogonal to the horizontal axis, and further pass through the center of the light emitting chip or proximity thereof; an area of the reflecting surface of the fixed reflector is greater than an area of the reflecting surface of the movable reflector; a reference focal point distance of the reflecting surface of the fixed reflector is greater than a reference focal point distance of the reflecting surface of the movable reflector; the reflecting surface of the fixed reflector is comprised of: a reflecting surface for low beam, forming a light distribution pattern for low beam; and a reflecting surface for high beam and daytime running light, forming a light distribution pattern for high beam or a light distribution pattern for daytime running light; the reflecting surface of the movable reflector is comprised of a reflecting surface for high beam and daytime running light, forming the light distribution pattern for high beam or the light distribution pattern for daytime running light; when the movable reflector is positioned in the first location, light which is radiated from the light emitting chip, or reflection light reflected on the reflecting surface for high beam and daytime running light, of the fixed reflector, is shaded by means of the movable reflector, and reflection light reflected on the reflecting surface for low beam, of the fixed reflector, is illuminated toward a forward direction of a vehicle, as the light distribution pattern for low beam; when the movable reflector is positioned in the second location, reflection light reflected on the reflecting surface for high beam and daytime running light, of the movable reflector; reflection light reflected on the reflecting surface for high beam and daytime running light, of the fixed reflector; and reflection light reflected on the reflecting surface for low beam, of the fixed reflector, respectively, are illuminated toward the forward direction of the vehicle, as the light distribution pattern for high beams; and when the movable reflector is positioned in the third location, reflection light which is reflected on the reflecting surface for high beam and daytime running light, of the movable reflector and then close-shifted or open-shifted; reflection light reflected on the reflecting surface for high beam and daytime running light, of the fixed reflector; and reflection light reflected on the reflecting surface for low beam, of the fixed reflector, respectively, are illuminated toward the forward direction of the vehicle, as the light distribution pattern for daytime running light.