Patent ID: 6667567
Filing Date: 2003-12-23
Classification: G02F,H01J

Abstract:
A light source unit comprising:(a) a light source having a main surface through which a light emitted from said light source passes towards an object; (b) a light-permeable substrate located between said main surface of said light source and said object; (c) a first seal sandwiched between said main surface of said light source and a surface of said light-permeable substrate and defining a first closed space together with said main surface and aid surface of said light-permeable substrate, said first closed space being in vacuum; and (d) a heat radiator equipped with said light source for outwardly radiating heat generated in said light source, wherein said light source includes (a) a first substrate facing said light-permeable substrate; (b) a second substrate; (c) a third substrate; (d) a second seal sandwiched between said first and second substrates and defining a second closed space together with said first and second substrates, noble gas being sealed in said second closed space; (e) a third seal sandwiched between said second and third substrates and defining said closed space together with said second and third substrates, said third seal being formed with a first through-hole through which heat accumulated in said third closed space passes outwardly of said third closed space.