LENS BODY AND VEHICLE LIGHTING FIXTURE

摘要

A lens body includes: an incident surface where light entering within a predetermined angular range with respect to an optical axis of the light source is refracted in a condensing direction; a first reflection surface that internally reflects the light; and a second reflection surface that internally reflects part of the reflected light from the first reflection surface. The lens body includes an emission surface of a convex lens surface. The second reflection surface extends backward from near a focal point of the emission surface. Light obtained by blocking part of the light internally reflected by the first reflection surface with a front edge of the second reflection surface, and the light internally reflected by the second reflection surface are emitted from the emission surface to from a predetermined light distribution pattern including a cutoff line defined by the second reflection surface at the upper edge.

主权项

1. A lens body including a rear end portion and a front end portion and an optical axis passing through the rear end portion to the front end portion and aligned in a light emitting direction of the lens body, light entering an interior of the lens body being emitted from the front end portion and projected forward to form a predetermined light distribution pattern including a cutoff line at an upper edge thereof, the lens body comprising:
an incident portion including an incident surface having a normal line tilted by a predetermined angle with respect to a reference axis orthogonal to the optical axis and included in a plane containing the normal line and the optical axis where light within a predetermined angular range with respect to the optical axis is refracted in a condensing direction and enters the interior of the lens body; a first reflection surface configured to internally reflect the light entering the interior of the lens body; and a second reflection surface configured to internally reflect at least part of the light being internally reflected by the first reflection surface, wherein the normal line of the incident surface is tilted with respect to the reference axis so that an incident angle of the light entering the interior of the lens body to the first reflection surface is greater than or equal to a critical angle, the front end portion is configured to include an emission surface that is a convex lens surface, the second reflection surface is configured as a reflection surface extending backward from near a focal point of the emission surface, and light obtained by blocking part of the light with a front edge of the second reflection surface, the light entering the interior of the lens body and being internally reflected by the first reflection surface, and the light internally reflected by the second reflection surface can be emitted from the emission surface and projected forward to form the predetermined light distribution pattern including a cutoff line defined by the front edge of the second reflection surface at the upper edge.