| 摘要 |
PURPOSE:To simply and easily form the tape cassette and to prevent the dislodgment of a window part by inserting a resin layer having a low modulus of elasticity between resin layers on both sides and integrating the intermediate layer and the window part for the remaining amt. of a tape with a transparent resin. CONSTITUTION:The upper and lower cassette halves 2, 3 are formed of a resin material 7 having a three-layered structure consisting of the resin layers 4, 5, 6. The intermediate resin layer 5 and the window part 8 for visually checking the remaining amt. of the tape are integrally formed of the transparent resin. The resin layers 4, 6 are formed of ABS and the resin layer 5 is formed of an elastomer having the lower modulus of elasticity than the modulus of elasticity of the resin layers 4, 6. The resin layer 5 is then so coated as to hold the resin layer 5 with the resin layers 4, 6 exclusive of the parts for the window part 8 for visually checking the residual amt. of the tape, by which the cassette halves 2, 3 are formed. A window frame 9 is templated in the resin layer 4 and a transparent thermoplastic resin is packed within the window frame 9, by which the window part 8 is formed integrally with the resin layer 5. The problems, such as peeling of the resin layer 5 and dislodgment of the window part 8, are then eliminated and since there is no need for considering the compatibility between the resin layers and, therefore, the range for selecting the resins is widened. |
