| 摘要 |
<p>A high-density rapid random-access retrieval apparatus for retrieving micrographic and data images stored on plural windowed discs (1). The apparatus is comprised of a disc/radial selection mechanism which moves axially on a cartridge containing a stack of closely spaced discs. Each disc (1) has a clear window (11) disposed on a radius thereof and a plurality of windows (9) containing micrographic and/or data images disposed along other radii. When the disc/radial selection mechanism has moved to a selected disc, the radial component (4) rotates the disc until the radius upon which the desired image is located is aligned with the clear windows in the other discs. The optical system (67) includes lens (67), reflecting surfaces (68), projection means, and image receiving means (103). Elements of the system are vertically adjustable and the latter includes a structure for keeping all of the optical path lengths constant as well as structure to maintain a constant distance between the light source (66) and the selected image.</p> |
