Patent ID: 10760743

Abstract:
A lamp is provided that includes a light source (119), having a laser diode (111, 511, 911) and a fluorescent sheet (112). The laser (121, 521, 621, 721, 921) emitted from the laser diode (111, 511, 911) is focused on the fluorescent sheet (112) and excites the fluorescent sheet (112) to emit fluorescent light (123, 323). The fluorescent sheet (112) has a transparent thermally conductive substrate (512a, 612a, 712a, 912a, 1012a) and a fluorescent coating (512b, 612b, 712b, 912b, 1012b) attached to the substrate, and has a diaphragm plate (717) disposed at a rear end of an optical path of the fluorescent sheet (112) and attached to the fluorescent sheet (112), the diaphragm plate (717) having a light-transmitting zone (717a) and a light-shading zone (717b) closely adjacent to each other. The diaphragm plate (717) can at least partially block light around a light-emission spot.