Patent ID: 7025832

Claim:
A deposition source installed in a chamber, heated by applied electric power to transfer heat to a vapor deposition material received therein and applying a vaporized deposition material generated therein to a substrate to form deposition organic electroluminescent layers onto the substrate, comprising; a vessel comprising a top plate on which a vapor efflux aperture is formed, a side wall, and a bottom wall; a heating means for supplying heat to the deposition material received in said vessel, said heating means being capable of moving vertically; a sensing means for sensing varied distances between said heating means and the surface of said deposition material; and a means for moving said heating means, said moving means being operated in response to a signal of the sensing means on the varied distances between said heating means and the surface of said deposition material, whereby said heating means is moved downward by said moving means to maintain the distance between said heating means and the surface of the deposition material at an initially-set value when the thickness of the deposition material is decreased, wherein said side wall has a number of vertical grooves formed on the inner surface thereof, and said top plate has a number of protrusions formed on the outer circumference surface thereof, each of said protrusions has such a size that each protrusion can be received in each of said grooves so that each of said protrusions of said top plate is moved along each of said grooves of said side wall when said top plate is moved vertically.