| 摘要 |
<p>PURPOSE:To suppress the cost-up of the device by reducing memory capacity. CONSTITUTION:The intersection points of light flux generated from a light emitter 3 to a light receiver 4 are divided and grouped every prescribed number of intersections, and these respective groups are made correspondent to information to be selected. Since each group can be recognized as one coordinate and table data correspondent to each coordinate are reduced, the memory capacity can be reduced, and the cost-up of the device is suppressed.</p> |
