Incremental printing of symbolic information – Ink jet – Housing
Patent
1993-08-19
1996-05-28
Reinhart, Mark J.
Incremental printing of symbolic information
Ink jet
Housing
358296, H04N 121
Patent
active
055216250
ABSTRACT:
A propagation-delay-transparent, video-signal interface suitable for use in a laser printer to carry a video signal from a formatter to a laser driver with minimal distortion. The interface includes two transmission paths, one for carrying the video signal produced by the formatter and another for carrying an inverted video signal or complement of the video signal. A differential circuit is included in the interface to determine a difference between the signals transmitted by the two transmission paths so that common-mode noise introduced along the transmission paths is substantially eliminated. The transmission paths include buffers, which restore pulses in the video signal to appropriate digital levels. The differential circuit includes hysteresis circuitry that, in combination with the differential function of the differential circuit, eliminates pulse width distortion of the video signal caused by delays of the buffers. The buffers are formed in pairs on common substrates so that the two transmission paths have nearly identical propagation delays, to further minimize pulse width distortion.
REFERENCES:
patent: 4814896 (1989-03-01), Heitzman et al.
Hewlett--Packard Company
Reinhart Mark J.
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