| 摘要 |
LED apparatus (10) for illumination toward a preferential side, including a light emitter (18) having at least one LED on a base (22), a primary lens (16) positioned over the light emitter and having a central axis (26), and a secondary lens (20) placed with an inner surface surrounding the primary lens. The secondary lens has a base-adjacent lower end defining a main plane substantially perpendicular to the central axis, and a compound outer lens surface (24) with a middle-region reference point defining a reference axis (44) parallel to the central axis (26). The compound outer lens surface includes (A) a principal perimeter surface (38) centered on the preferential side, the principal perimeter surface (a) projecting to a ridgeline subtending a substantial angle about the central axis, and (b) terminating inwardly at the ridgeline (42), (B) a middle region (50) containing the reference point and having a concavity thereabout, and (C) a non-principal perimeter surface centered on the non- preferential side and adjoining the middle region and the principal perimeter surface. |
