| CPC F21S 41/24 (2018.01) [F21S 41/143 (2018.01); F21W 2102/13 (2018.01)] | 6 Claims |
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1. A lamp comprising:
a light source configured to output light into the lamp, wherein the light source is located at a rear side of the lamp;
a light output part located at a front side of the lamp spaced apart from the light source, and configured to output the light output from the light source after the light is input into the rear side of the lamp by the light source; and
a guide part configured to guide travel of the light output from the light source such that the light travels to the light output part through the guide part, wherein the guide part extends from the rear side of the lamp to the light output part,
wherein:
the guide part is divided into a plurality of areas with respect to a forward/rearward direction of the lamp that extends forward from the rear side of the lamp to the front side of the lamp,
a width of an area of the guide part located at a front side of the guide part in a leftward/rightward direction of the lamp, within a group of at least some of the plurality of areas of the guide part, is greater than a width of another area of the guide part located at a rear side of the guide part, within the group of at least some of the plurality of areas, in the leftward/rightward direction, and
the lamp further comprises:
a light input part to which the light output from the light source is input and disposed at a rear end of the guide part between an output of the light source and the rear end of the guide part,
wherein the light input part includes:
a light input central part which has a convex surface which faces the output of the light source and is configured to refract a central light which is a first portion of the light output from the light source such that the central light travels toward a focus of the light output part; and
a light input outskirt part spaced apart from and facing the light input central part,
wherein:
the light input outskirt part surrounds the light input central part and includes an inner area that defines an inner peripheral surface of the light input outskirt part and an outer area that defines an outer peripheral surface of the light input outskirt part, and
the input outskirt part is configured so that light that passes through the inner area is refracted to the outer area where it is reflected and travels to the focus of the light output part,
wherein:
the guide part has a tapered shape, such that a width of the guide part in the leftward/rightward direction tapers to become smaller toward the rear side of the lamp;
the guide part includes inclined side surfaces, forming the tapered shape, extending to be inclined from the front side of the lamp to the rear side of the lamp toward an inside of the lamp;
a reference plane is defined by an imaginary plane passing through a center of the lamp and perpendicular to the leftward/rightward direction; and
the input outskirt part and the inclined side surfaces of the guide part are configured so that a first angle of inclination, relative to the reference plane, at one of the inclined side surfaces of an inclined light ray that is reflected off of the outer area of the input outskirt part before the inclined light ray reaches the one of the inclined surfaces is greater than a second angle of inclination formed by the inclined light ray and the reference plane after the inclined light ray is reflected off of the one of the inclined surfaces.
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