Light emitting module and lens
A light emitting module including a substrate having an insulating region and including a conductive pattern, a light source disposed on an upper surface of the substrate and electrically connected to the conductive pattern, a lens including a lower surface, a light incident region, a light exit portion, a leg protruding from the lower surface of the lens, and an adhesion material coupling the leg to the upper surface of the substrate, in which the light incident region has a central axis, the light incident region includes a protrusion facet, the protrusion facet having a first end and a second end opposite to the first end, and the protrusion facet is protruded toward the central axis with respect to an imaginary linear line connecting the first end and the second end of the protrusion facet.
1 . A light emitting module, comprising:
a substrate including an insulator and a conductive pattern;
a light source disposed on an upper surface of the substrate and electrically connected to the conductive pattern; and
a lens disposed on the light source to disperse light emitted from the light source, the lens including:
a lower surface facing the upper surface of the substrate;
a light incident region;
a light exit surface through which light having entered the lens through the light incident region exits the lens to an outside of the lens;
a flange arranged between the lower surface and the light exit surface, the flange having portions extending outside the upper surface of the substrate in plan view; and
legs protruding from the lower surface of the lens, wherein:
the light incident region has a central axis;
the light incident region includes a protrusion facet having a rounded shape; and
the legs are arranged within an inner boundary of the flange in plan view and are coupled to the upper surface of the substrate.
2 . The light emitting module of claim 1 , wherein the protrusion facet has an elliptical shape or a curved protrusion shape.
3 . The light emitting module of claim 1 , wherein the protrusion facet is formed in plural, and the plurality of protrusion facets face each other with respect to the central axis.
4 . The light emitting module of claim 3 , wherein at least one of the protrusion facets has a greater size than an adjacent one of the protrusion facets.
5 . The light emitting module of claim 4 , wherein the light incident region has a concave shape from the lower surface of the lens and includes a light incident surface.
6 . The light emitting module of claim 1 , wherein a major axis direction of the light incident region is coincident with a longitudinal direction of the substrate.
7 . The light emitting module of claim 3 , wherein the plurality of protrusion facets are linearly arranged along a first direction perpendicular to the central axis.
8 . The light emitting module of claim 1 , wherein the lower surface of the lens includes a slanted surface extending downwardly from the lower surface.
9 . The light emitting module of claim 1 , wherein a flange boundary is formed between the flange and the light exit surface.
10 . The light emitting module of claim 9 , wherein the protrusion facet is formed in plural, and at least one of the protrusion facets is disposed below the flange boundary in a major axis direction of the light incident region.
11 . The light emitting module of claim 1 , wherein the light incident region has a concave shape from the lower surface of the lens and includes a light incident surface.
12 . The light emitting module of claim 1 , wherein each of the light incident region and the light exit surface has a major axis and a minor axis in plan view, and the major axis of the light incident region is disposed at a right angle with respect to the major axis of the light exit surface.
13 . A lens for dispersing light emitted from a light emitting device disposed on a substrate, the lens comprising:
a lower surface facing the light emitting device;
a light incident region;
a light exit surface through which light having entered the lens through the light incident region exits the lens to an outside of the lens;
a flange arranged between the lower surface and the light exit surface, the flange having portions extending outside an upper surface of the substrate in plan view; and
legs protruding from the lower surface of the lens, wherein:
the light incident region has a central axis;
the light incident region includes a protrusion facet having a rounded shape
the protrusion facet is protruded inward toward the central axis of the light incident region; and
the legs are arranged within an inner boundary of the flange in plan view and are coupled to the upper surface of the substrate.
14 . The lens of claim 13 , wherein the protrusion facet has an elliptical shape or a curved protrusion shape.
15 . The lens of claim 13 , wherein the protrusion facet is formed in plural, and the plurality of protrusion facets face each other with respect to the central axis.
16 . The lens of claim 15 , wherein at least one of the protrusion facets has a greater size than an adjacent one of the protrusion facets.
17 . The lens of claim 16 , wherein the light incident region has a concave shape from the lower surface of the lens and includes a light incident surface.
18 . The lens of claim 13 , wherein a major axis direction of the light incident region is coincident with a longitudinal direction of the substrate.
19 . The lens of claim 15 , wherein the plurality of protrusion facets are linearly arranged along a first direction perpendicular to the central axis.
20 . The light emitting module of claim 1 , wherein a major axis of the light exit surface of the lens is perpendicular to a longitudinal direction of the substrate.