Recorders – Electric recording – Electrochemical
Patent
1992-01-10
1993-01-19
Miller, Jr., George H.
Recorders
Electric recording
Electrochemical
29854, 156643, 156655, 156668, G01D 1506, H01R 4300, B44C 122, B29C 3700
Patent
active
051810506
ABSTRACT:
An improved electrographic writing head employs interleaved arrays of writing nibs and small geometry, high impedance, thick film resistors and semiconductor driver circuits fabricated on a glass epoxy substrate. The writing head achieves significant savings in manufacturing costs by using low cost printed circuit and thick film technology. Power consumption may be reduced by more than half over prior art devices due to the high impedance of each thick film pull up resistor coupled with a associated writing neb. A ground plane is disposed internally of the substrate and between adjacent arrays of writing nibs. The ground plane prevents electrical interaction between the substrates and prevents the formation of parasitic nib-to-nib capacitance by shunting parasitic capacitance currents to ground. The ground plane thus reduces the possibility of flaring and substantially eliminates inadvertent writing by adjacent nibs.
REFERENCES:
patent: 3808675 (1974-05-01), Iiyama et al.
patent: 3903594 (1975-09-01), Koneval
patent: 4287525 (1981-09-01), Tagawa
patent: 4806957 (1989-02-01), Beegan
patent: 4920363 (1989-01-01), Hack
Bibl Andreas
Fellingham George H.
Hetherington Michael
Miller Jr. George H.
Rastergraphics Inc.
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