| 摘要 |
PURPOSE:To make a scan at an optional frequency with high accuracy by controlling a glavanomirror with a COS waveform voltage and sampling a signal from the galvanomirror with a sampling signal expressed by a specific equation. CONSTITUTION:The COS waveform voltage (a) generated by a control voltage generator 1 is corrected by an amplifier 5 based on frequency information (b) so as to make the angle of mirror deflection constant against frequency variation and sent as a control voltage (c) to the galvanormirror 4 to make a scan at an unequal speed. A signal generator 2 which receives a synchronizing signal (d), on the other hand, generates the sampling signal S(t) expressed by the equation. In the equation, N is the number of times of sampling, delta a delta function, alpha phase delay, and omega an angular frequency. An input device 3 receives the signal S(t) to perform sampling on the scanning line of the mirror 4 at equal intervals, its control section extends to the entire area of the half cycle of a mirror operation waveform, and the scanning of optional frequency is performed with high accuracy.
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