| 摘要 |
<p>A vacuum-operated holder board (1) for example to secure light-sensitive material to a process camera, which consists of a perforated faceboard (2) and a baseboard (3) and between these sheets separately delimited suction areas, from which the areas remaining beneath the sheet are brought into operation by connecting them through extract channels (7) to a vacuum source. In a holder board (1) in accordance with the invention the suction areas are formed between close surfaces by delimiting and dividing them from one another by a glue joint (4), sealing strip or mastic, and collector channels (6), which in the same way as the extract channels (7) are formed of channels cut into the faceboard (2), are used to improve the air flow. In the adaptation intended for a process camera it is advantageous if the baseboard (3) is transparent, e.g. a ground glass sheet, and the faceboard's (2) acrylic sheet's (8) surface is roughened, and it has a scale base. The same holder board (1) then acts as a normal film cassette for process cameras, as a projection surface, and as a matt-glass focussing glass.</p> |
