| 摘要 |
<p>[Object] To provide a plate having lightweight and strength which can be used for ultra-high speed shutter of cameras, etc. [Constitution] In a plate material for light-shielding blade made of a reinforced resin having a laminated structure comprising two sheets of a surface material layers made of a reinforced resin comprising continuous carbon fibers aligned in one driection substantially parallel to the lengthy direction of said light-shielding blade and a matrix resin including the fibers, and an intermediate layer sandwiched between these two sheets, characterized in that the intermediate layer is a reinforced resin comprising aromatic polyamide fibers and a matrix resin including the fibers, and also the polyamide resin may be either continuous fibers or short fibers, and the fiber direction is made substantially vertical to the lengthy direction of the light-shielding blade or arm. <IMAGE></p> |
