is applied to the reels 3L, 3C, and 3R. FIG. 6A is a perspective view of the cold-cathode tube and the protective case, and FIG. 6B is a sectional view taken on line VI-B-VI-B in FIG. 6A. [0059] Accordingly, in addition to protecting the inverter board 300 a, 300 b from the magnetic force, the light emitted from the cold-cathode tube 276 a, 276 b can be diffused; while the protective case 290 a,