Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2007-07-17
2007-07-17
Nguyen, Matthew V. (Department: 2838)
Incremental printing of symbolic information
Ink jet
Controller
C347S009000, C323S268000
Reexamination Certificate
active
11109255
ABSTRACT:
A capacitive load driving circuit which includes an operational amplifier, a pulse width modulator, a digital power amplifier, a first filter, a first feedback circuit and a second feedback circuit. The operational amplifier outputs a differential signal between a signal fed back to the inverting input terminal and an input signal inputted to the non-inverting input terminal. The pulse width modulator pulse width-modulates output from the operational amplifier and outputs a digital signal. The digital power amplifier amplifies power of the digital signal. The first filter smooths output of the digital power amplifier and inputs the smoothed signal to the capacitive load as the driving signal. The first feedback circuit feeds back the driving signal outputted from the first filter to the inverting input terminal of the operational amplifier. The second feedback circuit feeds back a signal outputted from the digital power amplifier, which signal includes a phase which is advanced relative to the driving signal, to the inverting input terminal of the operational amplifier.
REFERENCES:
patent: 3868698 (1975-02-01), Dressler
patent: 5631675 (1997-05-01), Futagawa
patent: 6609781 (2003-08-01), Adkins et al.
patent: 6929340 (2005-08-01), Ishizaki
patent: 11-020203 (1999-01-01), None
patent: 2000-117980 (2000-04-01), None
Fildes & Outland, P.C.
Fuji 'Xerox Co., Ltd.
Nguyen Matthew V.
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