US 11,655,960 B2
Light diffusing lens and light emitting device including the same
Jeong A Han, Ansan-si (KR); Eun Ju Kim, Ansan-si (KR); and Ki Bum Nam, Ansan-si (KR)
Assigned to Seoul Semiconductor Co., Ltd., Ansan-si (KR)
Filed by SEOUL SEMICONDUCTOR CO., LTD., Ansan-si (KR)
Filed on Nov. 22, 2019, as Appl. No. 16/692,166.
Application 16/692,166 is a continuation of application No. 15/030,575, abandoned, previously published as PCT/KR2014/013115, filed on Dec. 31, 2014.
Application 15/030,575 is a continuation in part of application No. PCT/KR2014/006513, filed on Jul. 17, 2014.
Claims priority of application No. 10-2013-0084327 (KR), filed on Jul. 17, 2013.
Prior Publication US 2020/0088386 A1, Mar. 19, 2020
Int. Cl. F21V 5/04 (2006.01); F21V 7/04 (2006.01); G02F 1/13357 (2006.01); G02B 6/12 (2006.01); G02B 19/00 (2006.01); G02B 3/00 (2006.01); G02B 5/02 (2006.01); F21V 13/04 (2006.01); G02F 1/1335 (2006.01)
CPC F21V 5/046 (2013.01) [F21V 7/04 (2013.01); F21V 13/04 (2013.01); G02B 3/00 (2013.01); G02B 5/02 (2013.01); G02B 6/12 (2013.01); G02B 19/0052 (2013.01); G02B 19/0071 (2013.01); G02F 1/133606 (2013.01); G02F 1/133607 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A light diffusing lens comprising:
a light exit portion defined by an outer side surface between an upper surface and a flat lower surface of the light diffusing lens and emitting light outwards;
a light incident portion having a concave shape depressed inwards from the lower surface of the light diffusing lens and corresponding to a region receiving incident light; and
a reflective portion corresponding to the upper surface of the light diffusing lens and having a concave shape depressed inwards from an upper portion of the light diffusing lens to reflect light towards the light exit portion,
wherein:
the light exit portion comprises a flat face and a convex face;
the flat face of the light exit portion is connected to an upper end of the reflective portion at a first connection point;
the convex face of the light exit portion extends from the flat face at a third connection point and is connected to a distal end of the lower surface of the light diffusing lens at a second connection point, the convex face of the light exit portion having a constant curved shape from the third connection point to the second connection point;
an interior angle formed by the convex face of the light exit portion and the lower surface of the light diffusing lens at the second connection point is an obtuse angle;
the light incident portion comprises a first convex face bulging in a direction of an optical axis of the light diffusing lens;
a first distance between the optical axis of the light diffusing lens and the first connection point is less than a second distance between the optical axis of the light diffusing lens and the second connection point;
a third distance defined as a maximum distance between the optical axis and the third connection point is greater than the first distance and is smaller than the second distance;
the lowest point of the reflective portion is located below the third connection point; and
a luminous intensity peak for light exiting from the flat face occurs at an angle equal to or greater than 100° from the optical axis.