1. An offset compensation circuit, comprising:
an amplifying element for amplifying an input signal and outputting the signal;
a power unit comprising:
a main current source connected to an input terminal of the amplifying element;
at least one additional current source connected to the main current source in parallel; and
a switching unit, correspondingly connected to the additional current source, for switching the additional current source to at least one of on and off to increase the offset voltage of the amplifying element in a discrete pattern; and
a feedback resistant element connected between a different input terminal and an output terminal of the amplifying elements.
2. The offset compensation circuit as set forth in claim 1, wherein the switching unit comprises:
a fuse; and
a switching pad, connected to both ends of the fuse, for supplying a large quantity of a current therethrough to disconnect the fuse.
3. The offset compensation circuit as set forth in claim 1, wherein the switching unit comprises switching elements to switch on and off according to input signals, and an offset control block for selectively switching the switching elements on and off to increase the offset voltage of the amplifying element in a discrete pattern.
4. The offset compensation circuit as set forth in claim 1, wherein the switching unit comprises:
switching elements that switch on and off according to input signals;
a sensor for sensing an output voltage of the amplifying element in synchronization with the offset control block and providing the output voltage to the offset control block; and
an offset control block for switching the switching elements on and off according to the sensed values.
5. An offset compensation circuit, comprising:
an amplifying element for amplifying an input signal and outputting the signal;
a resistor comprising:
a main resistor connected to an input terminal of the amplifying element;
at least one additional resistor connected to the main resistor in parallel; and
a switching unit, correspondingly connected to the additional resistor, for switching the additional resistor to at least one of on and off to decrease the offset voltage of the amplifying element in a discrete pattern; and
a feedback resistant element connected between a different input terminal and an output terminal of the amplifying element.
6. The offset compensation circuit as set forth in claim 5, wherein the switching unit comprises:
a fuse; and
a switching pad, connected to both ends of the fuse, for supplying a large quantity of current therethrough to disconnect the fuse.
7. The offset compensation circuit as set forth in claim 5, wherein the switching unit comprises switching elements that switch on and off according to input signals, and an offset control block for selectively switching the switching elements on and off to increase the offset voltage of the amplifying element in a discrete pattern.
8. The offset compensation circuit as set forth in claim 5, wherein the switching unit comprises:
switching elements that switch on and off according to input signals;
a sensor for sensing an output voltage of the amplifying element in synchronization with the offset control block and providing the output voltage to the offset control block; and
an offset control block for switching the switching elements on and off according to the sensed values.
9. An offset compensation circuit, comprising:
an amplifying element for amplifying an input signal and outputting the signal;
a power unit comprising:
a main current source connected to an input terminal of the amplifying element;
at least one additional current source connected to the main current source in parallel; and
a switching unit, correspondingly connected to the additional current source, for switching the additional current source to at least one of on and off to increase the offset voltage of the amplifying element in a discrete pattern; and
a resistor comprising:
a main resistor connected to an input terminal of the amplifying element, said input terminal being identical to that connected to the main current source;
at least one additional resistor connected in parallel to the main resistor; and
a switching unit, correspondingly connected to the additional resistor, for switching the additional resistor to at least one of on and off to decrease the offset voltage of the amplifying element in a discrete pattern; and
a feedback resistant element connected between a different input terminal and an output terminal of the amplifying element.
10. The offset compensation circuit as set forth in claim 9, wherein the switching unit comprises:
a fuse; and
a switching pad, connected to both ends of the fuse, for supplying a large quantity of current therethrough to disconnect the fuse.
11. The offset compensation circuit as set forth in claim 9, wherein the switching unit comprises switching elements that switch on and off according to input signals, and an offset control block for selectively switching the switching elements on and off to increase the offset voltage of the amplifying element in a discrete pattern.
12. The offset compensation circuit as set forth in claim 9, wherein the switching unit comprises:
switching elements that switch on and off according to input signals;
a sensor for sensing an output voltage of the amplifying element in synchronization with the offset control block and providing the output voltage to the offset control block; and
an offset control block for switching the switching elements on and off according to the sensed values.
13. An offset voltage compensation method, comprising the steps of:
measuring an offset voltage of an amplifying element for receiving an input signal and amplifying the signal, which is connected with at least two current sources in parallel and at least two resistant elements in series through its one input terminal and with a feedback through a different input terminal and an output terminal;
determining whether the measured offset voltage is in an operation range; and
selectively inactivating the current sources and the resistant elements according to the measured offset voltage so as to increase or decrease the offset voltage.
14. The offset voltage compensation method as set forth in claim 13, wherein fuses are connected in parallel with the current sources and in series with the resistant elements, and the selective inactivation step comprises the selective application of a high intensity current across the fuses to selectively disconnect the fuses.
15. The offset voltage compensation method as set forth in claim 14, wherein fuses are connected in parallel with the current sources and in series with the resistant elements, and the selective inactivation step comprises the selective irradiation of a laser beam onto the fuses to selectively disconnect the fuses.
16. The offset voltage compensation method as set forth in claim 14, wherein switching elements are connected with both the current sources and the resistant elements, and the selective inactivation step comprises selectively switching the switching elements to at least one of on and off.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A coating composition for producing recording sheet which comprises:
a) either (i) or (ii):
(i) from about 10% to about 90% by weight of the composition of a hydrophilic or amphiphilic polyether polyurethane plus from about 5% to about 85% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
(ii) from about 30% to about 90% by weight of cellulose acetate trimellitate plus from about 0% to about 50% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
b) from about 1% to about 8% by weight of a quaternary ammonium compound;
c) from about 0.05 to about 6% by weight of a metal salt;
d) from about 0.05 to about 6% by weight of a filler drying agent.
2. The coating composition of claim 1 further comprising a solvent composition in an amount sufficient to form a substantially uniform dispersion of the coating composition components.
3. The coating composition of claim 2 wherein the solvent composition comprises water, a C1 to C4 alcohol or mixtures thereof.
4. The composition of claim 1 further comprising from about 0.05 to about 0.2% by weight of the composition of a non-ionic surfactant.
5. The coating composition of claim 1 further comprising from about 0.05 to about 0.2% by weight of the composition of a non-ionic surfactant and a solvent composition in an amount sufficient to form a substantially uniform dispersion of the coating composition components.
6. The composition of claim 1 further comprising from about 0.05 to about 0.2% by weight of the composition of an ethylene oxide-propylene oxide fatty alcohol non-ionic surfactant.
7. The composition of claim 1 which comprises a polyether polyurethane having carboxylate, silicon and carbonate functionalities.
8. The composition of claim 1 wherein the polymer is selected from the group consisting of cellulose acetate, cellulose acetate phthalate, cellulose acetate propionate, cellulose acetate butyrate, hydroxypropyl methyl cellulose phthalate, hydroxy alkyl (C1-C3) cellulose, alkyl (C1-C3) cellulose, cellulose hydroxyalkyl phthalate, hydroxy propyl ethyl cellulose phthalate, hydroxypropyl methyl cellulose phthalate, preferred vinyl polymers are polyvinyl pyrrolidone, styrenated polyvinyl pyrrolidone, polyvinyl pyrrolidonepolyvinyl acetate copolymer, polyvinyl alcohol and polyvinyl acetate, polyethylene oxide copolymer and mixtures thereof.
9. The composition of claim 1 wherein the quaternary ammonium compound polymer is selected from the group consisting of poly (diallyldimethylammonium halide), poly (diallylethylamine hydrochloride), poly (dialkyldiallyl ammonium halide), poly (dimethylmethyldiaryl ammonium chloride), poly (diallylmethylammonium phosphate) and mixtures thereof.
10. The composition of claim 1 wherein the metal salt is selected from the group consisting of sodium, calcium, aluminum and magnesium sulfates and halides.
11. The composition of claim 1 wherein the filler drying agent is selected from the group consisting of microcrystalline cellulose, amorphous silica, cellulose pulp, silica gel and alumina.
12. A recording sheet which comprises a substrate and a dried coating composition on the substrate, which coating composition comprises:
a) either (i) or (ii):
(i) from about 10% to about 90% by weight of the composition of a hydrophilic or amphiphilic polyether polyurethane plus from about 5% to about 85% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
(ii) from about 30% to about 90% by weight of cellulose acetate trimellitate plus from about 0% to about 50% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
b) from about 1% to about 8% by weight of a quaternary ammonium compound;
c) from about 0.05 to about 6% by weight of a metal salt;
d) from about 0.05 to about 6% by weight of a filler drying agent.
13. The recording sheet of claim 12 wherein the substrate is selected from the group consisting of transparent plastic films, translucent plastic films, opaque plastic films, cloth, nonwoven fabrics, paper and combinations thereof.
14. The recording sheet of claim 12 wherein the substrate is selected from the group consisting of polyethylene terephthalate, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, nylon and polyolefin blends.
15. The recording sheet of claim 12 wherein the substrate has a thickness of from about 0.05 mm to about 0.5 mm.
16. The recording sheet of claim 12 wherein the dried coating composition has a coating weight of from about 0.5 micrometer to about 50 micrometers.
17. An imaged article which comprises a recording sheet and a dry colored image on the recording sheet, which recording sheet comprises a substrate and a dried coating composition on the substrate, which coating composition comprises:
a) either (i) or (ii):
(i) from about 10% to about 90% by weight of the composition of a hydrophilic or amphiphilic polyether polyurethane plus from about 5% to about 85% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
(ii) from about 30% to about 90% by weight of cellulose acetate trimellitate plus from about 0% to about 50% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
b) from about 1% to about 8% by weight of a quaternary ammonium compound;
c) from about 0.05 to about 6% by weight of a metal salt;
d) from about 0.05 to about 6% by weight of a filler drying agent; and wherein the dry colored image is on the dried coating composition on the substrate.
18. A process for producing an imaged article which comprises
I) providing a recording sheet which comprises a substrate and a dried coating composition on the substrate, which coating composition comprises:
a) either (i) or (ii):
(i) from about 10% to about 90% by weight of the composition of a hydrophilic or amphiphilic polyether polyurethane plus from about 5% to about 85% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
(ii) from about 30% to about 90% by weight of cellulose acetate trimellitate plus from about 0% to about 50% by weight of one or more polymers selected from the group consisting of cellulose ester polymers, cellulose ether polymers and vinyl polymers;
b) from about 1% to about 8% by weight of a quaternary ammonium compound;
c) from about 0.05 to about 6% by weight of a metal salt;
d) from about 0.05 to about 6% by weight of a filler drying agent; and
II) imaging the recording sheet by inkjet spraying and drying one or more colored inks onto the dried coating composition.