Patent ID: 6575609
Filing Date: 2003-06-10
Classification: F21S,F21W

Abstract:
A vehicle headlight having an irradiation direction, comprising:a light source; a first ellipse group reflecting surface having an optical axis direction substantially corresponding to the irradiation direction of the headlight, the first ellipse group reflecting surface having a first focus and a second focus, the first focus being located substantially at the light source, the first ellipse group reflecting surface configured to reflect light irradiated from the light source in the irradiation direction of the headlight; a projection lens having a focus in the irradiation direction of the headlight and in the vicinity of the second focus of the first ellipse group reflecting surface, the projection lens configured to project light irradiated from the light source and light reflected from the first ellipse group reflecting surface in the irradiation direction; a second ellipse group reflecting surface having an optical axis crossing the optical axis of the first ellipse group reflecting surface, the second ellipse group reflecting surface having a primary focus and a secondary focus, the primary focus of the second ellipse group reflecting surface located substantially at the light source; a first parabolic group reflecting surface having a focus located substantially at the secondary focus of the second ellipse group reflecting surface, the first parabolic group reflecting surface configured to reflect light reflected from the second ellipse group reflecting surface in the irradiation direction of the headlight; a second parabolic group reflecting surface having an optical axis substantially corresponding to the irradiation direction of the headlight, the second parabolic group reflecting surface having a focus located in the vicinity of the light source, the second parabolic group reflecting surface being arranged in the irradiation direction side from the first ellipse group reflecting surface; and a shutter provided in the vicinity of the focus of the projection lens, the shutter being capable of being placed in and withdrawn from an optical path of light reflected from the first ellipse group reflecting surface, the shutter having a shutter part and a shade part, the shutter part providing a low-beam light distribution pattern by being placed in the optical path of the reflected light from the first ellipse group reflecting surface and providing a high-beam light distribution pattern by being withdrawn from the optical path, the shade part shading light traveling from the light source to the second parabolic group reflecting surface when the shade is in a first position, and providing light from the light, source to the second parabolic group reflecting surface when the shade is in a second position.