(JP4267062-A)   NOVELTY - A gas separator (10) is arranged between gas diffusion electrodes of fuel battery. The electrode to which fuel gas is supplied comprises supply board with etched supply groove for circulating fuel gas, on surface. Oxidizing gas supply groove is formed by etching on supply board of second electrode. A cooling water supply board with groove is integrated in between, to contact the gas supply boards.    USE - For fuel batteries, especially solid polymer electrolyte film fuel battery.    ADVANTAGE - The gas separator combines a fuel gas supply board and an oxidizing gas supply board on both sides of the cooling water board. The three boards can be processed separately and integrated. Thus, even if thin plate, the boards can be subdivided and minute etched supply grooves in the shape of arbitrary channels can be obtained. Thereby, the structure of the battery is miniaturized. A completely separate and uniform supply of fuel gas and oxidizing agent gas is enabled, and battery having high performance by improvement in collector efficiency is obtained. Control of heating value accompanied by electric power generation and stabilization of service condition, are attained.    DETAILED DESCRIPTION - Fuel gas is supplied to gas diffusion electrode on one side and an oxidizing agent gas is supplied to gas diffusion electrode on other side. The gas diffusion electrode to which fuel gas is supplied comprises a fuel-gas supply board (20), with supply groove (21) for circulating fuel gas, formed by etching on the surface. Oxidizing gas supply groove (41) is formed by etching on oxidizing gas supply board (40) provided to the second gas diffusion electrode. The two gas supply boards are made of stainless steel or copper, having thickness of 1mm. A cooling water supply board (30) with supply groove (31) for circulating cooling water, formed by etching, contacts the faces (where no grooves are formed) of the fuel gas and oxidizing gas supply boards, and joining-integration of the cooling water supply board (stainless or copper) having thickness of 0.5 mm is performed with the gas supply boards.    DESCRIPTION OF DRAWING(S) - The figure shows exploded perspective view of gas separator. (Drawing includes non-English language text).    Gas separator (10)    Fuel gas supply hole (11)    Oxidizing agent gas supply hole (12)    Fuel gas supply board (20)    Fuel gas supply groove (21)    Cooling water board (30)    Cooling water supply groove (31)    Oxidizing agent gas supply board (40)    Oxidizing gas supply groove (41)