LENS, LIGHTING SYSTEM, BULB-SHAPED LAMP, AND LIGHTING FIXTURE

摘要

A lens 14 includes a first lens section 46 and a second lens section 48, which are integrally formed. The first lens section 46 is formed in a hemispherical shell shape including a first recess 45 opened toward one side of an optical axis direction in which light from a light source 34 is made incident. The second lens section 48 is formed in a hemispherical shell shape including a second recess 47 opened toward the other side of the optical axis direction.