Light diffusing lens having a lower concave depressed incident portion and an upper concave depressed reflective portion and light emitting device having the same

A light diffusing lens, comprising:

• a light incident portion having a concave shape depressed inwards from a lower portion of the light diffusing lens;
• a reflective portion having a concave shape depressed inwards from an upper portion of the light diffusing lens;
• and
• a light exit portion defined by an outer side surface of the light diffusing lens,
• wherein the light incident portion comprises a first convex face bulging in a direction of an optical axis defined by a straight line passing through a center of the light diffusing lens, wherein the light incident portion further comprises a first flat face extending in a perpendicular direction with respect to the optical axis of the light diffusing lens,
• wherein an absorption member is disposed on the first flat face of the light incident portion and is configured to absorb light.

A light diffusing lens, comprising:

• a light incident portion having a concave shape depressed inwards from a lower portion of the light diffusing lens;
• a reflective portion having a concave shape depressed inwards from an upper portion of the light diffusing lens;
• and
• a light exit portion defined by an outer side surface of the light diffusing lens,
• wherein the light incident portion comprises a first surface slanted with respect to a direction of an optical axis defined by a straight line passing through a center of the light diffusing lens,
• wherein the light incident portion further comprises a second surface slanted with respect to the optical axis,
• wherein the first surface of the light incident portion extends directly from an inner apex of the light incident portion to the second surface of the light incident portion,
• wherein the second surface of the light incident portion extends from the first surface of the light incident portion to a lower surface of the light diffusing lens,
• wherein the first and second surfaces of the light incident portion have different oblique angles with respect to the optical axis.

A light emitting device, comprising:

• a light emitting element;
• and
• a light diffusing lens disposed on the light emitting element and comprising a light incident portion, a reflective portion, and a light exit portion,
• wherein the light incident portion has a concave shape depressed inwards from a lower portion of the light diffusing lens, the reflective portion has a concave shape depressed inwards from an upper portion of the light diffusing lens, and the light exit portion is defined by an outer side surface of the light diffusing lens, and
• wherein the light incident portion comprises a first convex face bulging in a direction of an optical axis defined by a straight line passing through a center of the light diffusing lens,
• wherein the first convex face of the light incident portion extends directly from an inner apex of the light incident portion to a lower surface of the light diffusing lens, and
• wherein an internal angle defined between the light exit portion and the lower surface of the light diffusing lens is less than 90°.