| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the occurrence of fluff or the like by welding a cut part at a cutting work time by manufacturing the light shielding material of a specified shape attached at an aperture part side wall by executing a cutting work for a textile fabric-like light shielding material by light having a converging property such as a laser beam. SOLUTION: Slit-like aperture parts 27b and 27a for the guiding in and out of film formed so as to be opposed are formed at a cassette film supply container 23b and a take-up container 23a, and the light shielding materials are respectively attached at the side walls of respective aperture parts 27b and 27a for shielding the light. The light shielding material is formed by cutting the textile fabric-like light shielding material by the laser beam. Thus, respective fibers such as a ground and pile crossed on a cut surface are mutually welded by the laser beam, so that the occurrence of the fluff and that of a part easily frayed are eliminated. Also, the upper end sides of the light shielding materials 37a and 37b projected on the upper sides of the aperture parts 27a and 27b are cut by the laser beam with which scanning is executed in horizontal directions Le-Lf and Lg-Lh at the height positions of the upper ends of the containers 23a and 23b.</p> |
