Patent Number: 
Section: claims

1. An apparatus for manufacturing a disc-shaped object, comprising:an electron beam irradiation apparatus including a first rotational unit provided in an openable/closable shield container and accommodating a disc-shaped object rotationally driven, and an electron beam irradiation unit for irradiating the surface of said on-rotating disc-shaped object with electron beams;a chamber including a second rotational unit capable of accommodating said disc-shaped object and an exchange chamber that is air-tightly closable and openable/closable independently of said shield container; anda rotational unit for exchanging said first and second rotational units with each other by rotating said first rotational unit in said shield container and said second rotational unit in said exchange chamber,wherein said electron beam irradiation unit and said disc-shaped object are relatively moved when irradiating said on-rotating disc-shaped object with the electron beams. 2. An apparatus for manufacturing a disc-shaped object according to claim 1, wherein a width of said electron beam irradiation unit in a direction orthogonal to a rotating direction of said irradiation target object within a rotating plane of said disc-shaped object, is smaller than a radius of said disc-shaped object. 3. An apparatus for manufacturing a disc-shaped object according to claim 1, wherein a rotating speed of said disc-shaped object is changed corresponding to a position of the irradiation by said electron beam irradiation unit over said disc-shaped object. 4. An apparatus for manufacturing a disc-shaped object according to claim 3, wherein said first rotational unit and said second rotational unit are so constructed as to be capable of revolving, and said first rotational unit irradiates the surface of said on-rotating disc-shaped object with the electron beams from said electron beam irradiation unit. 5. An apparatus for manufacturing a disc-shaped object according to claim 3, wherein the rotating speed of said disc-shaped object is decreased when said electron beam irradiation unit irradiates an outer periphery side of said disc-shaped object with the electron beams and is increased when irradiating an inner periphery side with the electron beams. 6. An apparatus for manufacturing a disc-shaped object according to claim 1, wherein a moving velocity of said electron beam irradiation unit is changed corresponding to the position of the irradiation by said electron beam irradiation unit over said disc-shaped object. 7. An apparatus for manufacturing a disc-shaped object according to claim 6, wherein the moving velocity of said electron beam irradiation unit is decreased when said electron beam irradiation unit irradiates the outer periphery side of said disc-shaped object with the electron beams and is increased when irradiating the inner periphery side with the electron beams. 8. An apparatus for manufacturing a disc-shaped object according to claim 1, wherein said electron beam irradiation unit comprises an irradiation window of a single electron beam irradiation tube.