COMPLIANT LEADSCREW SPLIT NUT
Original Publication Date: 1988-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In raster aperture card scanners, the image source, a microfilm bearing aperture card, must be precisely positioned and moved during the scanning process. For this, a slide assembly 1 (shown in Figure 1) is used, slide assembly 1 having a movable carrier 2 on which the aperture card to be scanned is placed. However, precise motion is required in order to allow the scanning element, typically a Charged Coupled Device (CCD), to sample the microfilm and convert the film image to image signals or pixels. In order to effect the precise movement required, a screw and nut drive is normally used to impart reciprocating scanning movement to the aperture card carrier 2.