| 摘要 |
PURPOSE:To prevent an exposure surface and a filter from flawing by decreasing the diameter of a roller part corresponding to the effective record formation range of an exposure surface as compared with roller parts corresponding to both edges of a recording medium or removing the part. CONSTITUTION:Two couples of upper and lower rollers, i.e. four rollers 11, 12, 13, and 14 in total are provided in front of the exposure tube surface 10 across the exposure surface. The designed length l of small-diameter parts 12a and 14a of the rollers 12 and 14 is larger than the scanning width of an electron beam by an exposing device 10, i.e. effective record formation range. Consequently, no pressing force from the rollers is applied to the recording surface of the recording medium 20 and the recording surface neither flaws nor deteriorates in picture quality. Further, the small-diameter part corresponding part is removed except only at both end press-contacting parts of rollers 16 and 17 to prevent pressing force from being applied to an electron beam scanning area, thereby preventing the recording surface from flawing. |
