| 摘要 |
PURPOSE:To facilitate trimming, by providing a shielding and adjusting plate sliding back and forth and left and right respectively to shield an opening part for exposure at the lower part of the main body of a negative mask or at the upper part of a negative keep plate. CONSTITUTION:The negative keep plate 2 and the main body of a negative mask 3 equipped with opening parts for exposure 7, 8 coincident with the picture of a film are pivotally supported so as to hold a negative film between both. A storing box 6 equipped with an opening part 14 is fixed on the lower part of the main body, and shielding and adjusting plates 4, 4, 5, 5 sliding to the back and forth directions and to the left and right directions respectively to shield the opening part 14 are stored in the box. The control of position at the sliding time of the plates 4, 5 is performed by long holes 15, 20, projections 16, 21 and magnets 19, 24 made of an elastic material, and they are operated by arms 17, 22 extended from notches 18, 23, respectively. By this way, the operation is facilitated as compared with trimming by the usual paper mask. |
