| 摘要 |
Apparatus is provided for giving a visual indication of increments of position over a predetermined range of positions to either side of and including a predetermined zero reference point. The apparatus includes a plurality of pattern generating units, each including first and second surfaces, each of these first and second surfaces having a plurality of spaced-apart opaque areas having translucent areas therebetween. The second surface is superimposed upon the first surface for creating a plurality of patterns in response to movement therebetween. The plurality of pattern generating units are arranged adjacent one another and are respectively configured for producing a unique and identifiable set of patterns for each of a plurality of increments over a predetermined range to either side of and including a predetermined zero reference point.
|
