| 摘要 |
A scan control circuit for detecting a stable scanning movement of a hand-held type printer over a copy paper includes an encoder for producing pulses in response to the scan movement of the hand-held type printer. The pulses are applied to a stable scan detector and also to a gate circuit. The stable scan detector detects a frequency of the pulses and produces an enable signal when the frequency exceeds a reference frequency. By the enable signal, the gate circuit is enabled to start counting the pulses. When the gate circuit counts a predetermined number of pulses, a power on signal is produced for starting the copy reproducing operation.
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