CPC G02B 3/00 (2013.01) [A61L 2/26 (2013.01); F24F 13/22 (2013.01); G02B 27/0955 (2013.01); H01L 33/58 (2013.01); A61L 2202/11 (2013.01); F24F 2013/228 (2013.01); G02B 2003/0093 (2013.01); H01L 33/483 (2013.01)] | 18 Claims |
1. A light emitting module comprising:
a light source; and
an optical member configured to control a distribution of light emitted from the light source; wherein:
the optical member comprises an incident face on which the light from the light source is incident, and an output face through which the light incident on the incident face exits,
in a plan view:
the optical member is shaped to have a long axis and a short axis orthogonal to the long axis, and
a central axis of the optical member passes through a center of the light source, a center of the incident face, and a center of the output face, while being orthogonal to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis;
in a long axis cross section of the optical member, in a plane that includes the long axis and the central axis:
the incident face is concave shaped and has a curved face portion that intersects the central axis, and
the output face has a concave portion positioned in a region that includes the central axis, and convex portions that are at both ends of and are continuous with the concave portion;
in a short axis cross section of the optical member, in a plane that includes the short axis and the central axis:
the incident face is concave shaped and has a flat face portion that intersects the central axis and is parallel to the short axis direction, and
the output face is convex shaped;
in a plan view, the light source is disposed in a region in which the incident face is positioned;
in the long axis cross section, a minimum distance between the light source and the incident face is smaller than a minimum distance between the light source and the incident face in the short axis cross section; and
a length of the flat face portion is in a range of two to three times a length of the light source in the short axis direction.
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