Scan control circuit for hand-held type printer

Details Scan control circuit for hand-held type printer Scan control circuit for hand-held type printer

1989-05-30

1991-03-26

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

382 59, 340670, 358473, H04N 102

Patent

active

050031937

ABSTRACT:
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.

REFERENCES:
patent: 4523235 (1985-06-01), Rajchman
patent: 4597465 (1986-07-01), Burney
patent: 4887165 (1989-12-01), Sato et al.
patent: 4901163 (1990-02-01), Tsujioka et al.

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