| 摘要 |
<p>A magnifying device comprises a large Fresnel lens (101) in a frame (103'). The frame (103') has means (109', 110') to keep the frame at a suitable distance from the object to be viewed, e.g. a book (123). Lighting means (111) which illuminates the object (123) to be viewed are included in the frame (103') and are arranged to emit light at suitable angles, in particular in relation to the Fresnel lens (101) so that this light will not impair the viewing of the book (123). The means to keep the frame at a suitable distance include in some embodiments transparent devices (125) to keep books (123) and other uneven objects to be viewed flat.</p> |
