| 摘要 |
<p>A reader for viewing enlarged images of selected portions of a flat film microfiche. The film is sandwiched between flat transparent plates of a holder, which is easily slidable in a carriage to bring a selected micro image into the optical projection path, positioning being facilitated by a guide in the table on which the carriage moves. To ensure precise focussing, the lens unit rides on and is supported by the upper plate of the film holder. When the holder is pulled forward the upper plate automatically rises to allow removal or replacement of the film. The illumination source and a portion of the optics are disposed within a removable drawer translatably positioned in the reader housing.</p> |
