Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1992-03-04
1994-07-19
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
388409, 388474, B41J 2435, H04N 121
Patent
active
053313429
ABSTRACT:
A basic clock generated from a crystal oscillator is delayed by a constant time in each of a plurality of delay elements connected in series. Consequently, internal clocks which differ in phase by a predetermined amount are outputted from the delay elements. Output signals of the delay elements are inputted to a clock selector. The clock selector selects any one of the internal clocks on the basis of a beam detection signal indicating the timing of the scanning of a photoreceptor by a laser beam to output the same as a video clock. The clock selector selects any one internal clock whose phase difference from the beam detection signal is closest to a predetermined phase difference out of the internal clocks, the phase difference from the beam detection signal meaning the time difference between the time when the beam detection signal has a predetermined phase angle and the time when the internal clock has a predetermined phase angle. A horizontal synchronizing signal is generated by counting a video clock at the timing based on the beam detection signal. The video clock outputted from the clock selector is synchronized with the beam detection signal with high precision. As a result, the horizontal synchronizing signal generated can be synchronized with the beam detection signal with high precision.
REFERENCES:
patent: 4663523 (1987-05-01), Swanberg
patent: 4796095 (1989-01-01), Shimada
patent: 4926263 (1990-05-01), Yokota
patent: 5115256 (1992-05-01), Miyagi et al.
Patent Abstracts of Japan, vol. 12, No. 134 (M-689) Apr. 23, 1988 & JP-A-62 257 856 (Copal Electron Co. Ltd.) Nov. 10, 1987.
Patent Abstracts of Japan, vol. 12, No. 9 (E-572) Jan. 12, 1988 & JP-A-62 169 575 (Hitachi Ltd.) Jul. 25, 1987.
Okumura Takuji
Shimatani Akira
Mita Industrial Co. Ltd.
Reinhart Mark J.
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