| 摘要 |
<p>The photographic light cell (13) controls a micro motor (14) to move in either direction to this micrometer (14) also opens or closes like diaphragms of the light cell (13) and the objective with identicle angles. The light cell (13) and like photographic film (5) receive incident rays through identicle optical systems (2, 8). These rays also pass through identical diaphragms (10, 6) so that the illumination received by the cell is strictly the same as that received by the film. The cell (14) and objectives are placed at the centre of gear (11, 7) wheels. These gearwheels (11, 7) are of the same diameter and mesh with each other. These rotation is obtained by the action of the micrometer (14). The pulses to the micrometer (14) being controlled by the light cell (13).</p> |
