Electron beam irradiation device

For sufficiently irradiating an electron beam over a film the thickness of which is extremely small in comparison to the electron beam path length, the film is so fed by guide rollers as to be subject to radiation a number of times. The guide rollers are disposed along the line of a rectangular spiral and the film is laid on the guide rollers without any one section of the film contacting the other so that sections of the film overlap each other in the plane of the irradiated beam. The overlapped sections are thus irradiated while the film is fed toward the center of the spiral and are taken up through an inclined guide roller disposed at the center of the spiral. Since one side of the film never contacts the guide rollers during irradiation, any coating applied over this side is allowed to harden without disruption. (Ohno, Y.)