Shower plate

Patent Granted This invention provides a shower plate comprising gas release hole members (ceramic member or porous gas flow body) bonded by sintering integrally without any space and disposed, for plasma back flow prevention purposes, within vertical holes in a shower plate. The above constitution is advantageous in that the gas release member does not come off from the vertical holes during use of the shower plate, there is no variation in the amount of gas released from each vertical hole, the back flow of plasma can be more fully prevented, and plasma excitation with high efficiency can be realized.