Lens and bulb-type light emitting device lamp employing the lens
AssigneeSamsung Electronics Co., Ltd.
InventorTetsuo Ariyoshi
Life of this patent
Estimating the term…
Abstract
A lens and a bulb-type light emitting device lamp employing the lens are disclosed. The lens for changing light distribution of incident illumination light and emitting the illumination light includes a light incident surface that is curved, a top surface that is planar and via which at least a portion of light incident via the light incident surface is emitted, and a side surface that is uneven and via which at least a portion of light incident via the light incident surface is emitted. The bulb-type light emitting device lamp includes the lens and a light emitting device package including one or more light emitting devices.
Claims17
A lens for changing light distribution of incident illumination light and emitting the illumination light, the lens comprising:
- a light incident surface comprising a first curved surface having a first curvature and a second curved surface having a second curvature, which is different from the first curvature;
- a top surface;
- and
- a side surface which is uneven,
- wherein a majority of the transmitted through the first curved surface is emitted via the top surface, and a majority of the light incident on the second curved surface is emitted via the side surface, and
- wherein the lens is rotationally symmetric with respect to a central axis and an outmost diameter of the lens is constant with respect to a height of the lens.
A lens for changing a distribution of incident light, the lens comprising:
- a top surface which is planar;
- a light incident surface, opposite the top surface, wherein the light incident surface comprises a first curved surface which is concave and has a first curvature and a second curved surface which is convex and has a second curvature, different form the first curvature;
- a side surface which is prismatic;
- wherein the first curved surface is centrally disposed with respect to the lens, and the second curved surface surrounds an outer perimeter of the first curved surface.
Dependencies are inferred from the claim text.