| 摘要 |
A clear, transparent, rigid plastic sheet is bent into an inverted U-shape to provide a top (40) supported by continuously transparent legs (42, 44). A fresnel lens (50), co-extensive with the top, is secured to the top or actually formed in one of its surfaces to provide a hand-free, self-supporting large area magnifier capable of use in reading a complete printed page with little or no shifting of the magnifier. For various scientific and other purposes, scales, grids, or other reference marks (62) or patterns are carried on transparent elements secured to the bottoms of the legs where they are likewise magnified for counting or measuring or other large area analysis, or study of a full page or document being read. |
