Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
175 words
An electrographic writing system comprising: an electrographic writing head including a plurality of styluses operatively connected to a switching system; the switching system including at least one diode assembly, each diode assembly including a plurality of diode switching circuits controlling the voltage of the plurality of styluses, each of diode switching circuits including a first diode, a charge storage means operatively connected thereto and a stylus operatively connected to the storage means, drive means for generating a forward voltage across the diode assembly which causes a current flow through the first diode if the first diode is in a diode switching circuit that is set up, the drive means subsequently generating a reverse input across the first diode and the charge storage means which causes a reverse current through the first diode which charges the storage means so that the stylus reaches and maintains a voltage for a time sufficient to charge a record medium; and means for setting up the diode switching circuits in order to determine which diode switching circuits may conduct current.
Claim 2
Dependent Claim
175 words
An electrographic writing system comprising: an electrographic writing head including a plurality of styluses operatively connected to a switching system; the switching system including at least one diode assembly, each diode assembly including a plurality of diode switching circuits controlling the voltage of the plurality of styluses, each of diode switching circuits including a first diode, a charge storage means operatively connected thereto and a stylus operatively connected to the storage means, drive means for generating a forward voltage across the diode assembly which causes a current flow through the first diode if the first diode is in a diode switching circuit that is set up, the drive means subsequently generating a reverse input across the first diode and the charge storage means which causes a reverse current through the first diode which charges the storage means so that the stylus reaches and maintains a voltage for a time sufficient to charge a record medium; and means for setting up the diode switching circuits in order to determine which diode switching circuits may conduct current.
Claim 3
Dependent Claim
17 words
The electrographic writing system of claim 1 wherein the first diode is a high stored charge diode.
Claim 4
Dependent Claim
26 words
The electrographic writing system of claim 2 wherein the means for setting up includes a second low stored charge diode in series with the first diode.
Claim 5
Dependent Claim
15 words
The electrographic writing system of claim 3 wherein the charge storage means is a capacitor.
Claim 6
Dependent Claim
29 words
The electrographic writing system of claim 4 wherein the difference in stored charge between the first diode and the second diode is more than 40 nanocoulombs after set up.
Claim 7
Dependent Claim
34 words
The electrographic writing system of claim 5 wherein the first diode has a stored charge of about 60 nanocoulombs and the second diode has a stored charge less than 10 nanocoulombs after set up.
Claim 8
Dependent Claim
17 words
The electrographic writing system of claim 6 wherein the capacitor has a value of about 30 pf.
Claim 9
Dependent Claim
20 words
The electrographic writing system of claim 4 wherein each of the styluses is operatively connected to a diode switching circuit.
Claim 10
Dependent Claim
25 words
The electrographic writing system of claim 8 wherein the means for setting up further includes setup switches operatively connected to a plurality of diode assemblies.
Claim 11
Dependent Claim
29 words
The electrographic writing system of claim 8 wherein setup switches are operatively connected across the diode assemblies to similarly located diode switching circuits in each of the diode assemblies.
Claim 12
Dependent Claim
13 words
The electrographic writing system of claim 10 wherein the setup switches are transistors.
Claim 13
Dependent Claim
30 words
The electrographic writing system of claim 11 wherein a voltage is applied to the capacitors to prevent a voltage build up on the styluses when the setup switches are open.
Claim 14
Dependent Claim
22 words
The electrographic writing system of claim 12 wherein a bias voltage is applied through a clamping diode across the transistor setup switches.
Claim 15
Dependent Claim
59 words
The electrographic writing system of claim 13 wherein the electrographic writing head includes a plurality of styluses supported by a dielectric material, the ends of the styluses accessible at one end of the writing head to charge the record medium and the other ends of the styluses accessible so that they may be operatively connected to the switching system.