| 摘要 |
PURPOSE:To perform a printing operation without expansion nor contraction by inputting a data signal after the vibrator of a galvanomirror securely enters a steady state. CONSTITUTION:A timing circuit 11 counts up from the leading of the output signal H/S of one reference position sensor to the leading of the output signal E/S of the other reference position sensor and sends out a specific time pulse, and a phase comparator 12 compares the phase of this pulses P with the phase of the signal E/S and sends out the pulse width DELTAt of the phase shift. A gate delay circuit 13 generates a delay time T1 at the trailing of this time T1 and an AND gate 16 detects ¦DELTAt-T1¦=DELTAT. The signal T1 is counted 15 after DELTAT becomes zero to generate a ripple carry signal C, and consequently an FF 17 is set, thereby indicating that the galvanomirror is within a resonance control range.
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