1) single plate dark slide
单片遮光滑板
2) masking blade
遮光板,掩蔽片
3) Shading slider
遮光滑块
4) masking blade
遮光叶片
5) an anti-dazzling screen
遮光片
6) viser board
遮光纸板
补充资料:阿克伦德氏遮光板