| 摘要 |
PURPOSE:To make it possible to set optimum shifting position of a condenser at high accuracy in a short time by making a controller store and hold optimum number of pulses and control rotation angle of a stepping motor. CONSTITUTION:For instance, when switching a condenser 6 to the first optical fiber 1 side, electric pulses are given gradually to a stepping motor 11 to rotate the condenser 6 slowly. At this time, electric pulses are given, for instance, from a keyboard added to a microcomputer. Optimum rotational position of the condenser 6 is determined to make the output value of a light detector 2 maximum, and a controller 14 stores and holds the optimum number of pulses when the optimum rotational position is arrived at. Similarly, optimum rotational position of the condenser 6 for the second - tenth optical fibers 1 is found and optimum number of pulses at that time is stored and held. Thus, rotation angle of the stepping motor 11 is controlled according to stored and held value, and the condenser 6 is switched automatically to the optimum rotational position. |
