Lamp comprising a phosphor, radiation source, optical system and heatsink

摘要

A lamp comprises a thin layer of phosphor (105,113) which is irradiated (46), for example by ultraviolet radiation, by a source which typically comprises a laser diode and a condenser (101,111). This causes the phosphor (105,113) to emit visible light with a Lambertion-type emission pattern. An optical system such as a reflector (102,115) concentrates the light from the phosphor (105,113). The phosphor (105,113) is thermally connected to a heatsink (103,116), of example by a plate (114) of sapphire glass, so as to dissipate the heat produced by the phosphor (105,113). The phosphor (105) may be mounted on a plane reflector (104) disposed on or comprising the heatsink (103) and facing a curved reflector (102) and the radiation source. Alternatively, the optical system may have an optical axis and the phosphor (113) may be substantially flat and inclined with the respect to the optical axis.

主权项

1. A lamp comprising a phosphor, a radiation source arranged to irradiate the phosphor with optical radiation that is at least partly in the visible spectrum for exciting the phosphor to produce visible light, an optical system arranged to concentrate the light produced by the phosphor, and a heatsink thermally connected to the phosphor and arranged to dissipate heat produced by the phosphor; in which the phosphor is mounted on a plane reflector being at least one of disposed on the heatsink and a reflective surface of the heat sink, and facing a curved reflector and the radiation source;
the lamp further comprising at least one filter layer that is transparent to the optical radiation but reflects visible light emitted by the phosphor, wherein the filter layer is disposed between the phosphor and the optical radiation source; and a heat-conductive member positioned after the optical radiation source and before the phosphor in the path of the optical radiation, wherein the heatsink is in thermal communication with the heat-conductive member that is transparent to the optical radiation, and the optical radiation passes through the heat-conductive member before reaching the phosphor.