Ink jet printer

Claim 2

An ink jet printer comprising a means for jetting pressured ink out of a nozzle to produce ink droplets flying toward a recording medium; an electro-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; a HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink particles; an information recording signal generator for generating an information recording signal voltage in response to a clock signal generated on the basis of the output of said HF power source; an annex signal generator for generating an annex signal voltage for a droplet deflection sensitivity detecting signal and a phase detecting signal in response to said clock signal; a compensation signal generator for generating a predetermined compensation signal for cancelling the influence given to the charge of information recording ink droplets due to charging ink droplets by the annex signal voltage on the basis of said clock signal, in parallel with said annex signal, and a circuit means having at least a synthesizing circuit for synthesizing the outputs of said three generators and applying the synthesized output to said charging electrode.

Claim 3

An ink jet printer as claimed in claim 1, wherein said compensation signal is located at the position following the annex signal voltage and has the same polarity to as that of said annex signal.

Claim 4

An ink jet printer as claimed in claim 1, wherein said synthesizing circuit includes an operational amplifier, the input terminal of said operational amplifier is connected through respective resistors with said information recording signal generator, said annex signal generator and said compensation signal generator.

Claim 5

An ink jet printer as claimed in claim 1, wherein said synthesizing circuit means comprises a first synthesizing circuit for synthesizing said annex signal and said compensation signal and a second synthesizing circuit for synthesizing the output of said first synthesizing circuit and said information recording signal.

Claim 6

An ink jet printer as claimed in claim 1, wherein said information recording signal generator has a flip-flop in said clock signal circuit, said annex signal generator having two flip-flops connected to said clock signal circuit in series, and said compensation signal generator having two flip-flops connected to said clock signal circuit in series.

Claim 7

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce ink droplets flying toward a recording medium; an electro-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink droplets; and a clock signal circuit connected to said HF power source; wherein there is provided an information recording signal generator for generating an information recording signal voltage in response to a clock signal produced by said clock signal circuit in order to charge each ink droplet spaced with a predetermined interval with an electric charge according to a deflection amount for information recording; an annex signal generator for generating an annex signal voltage with a predetermined value in response to the clock signal of said clock signal circuit in order to provide a constant electric charge corresponding to a deflection amount for a droplet deflection sensitivity detecting signal and a phase detecting signal with a predetermined cycle to droplets located between the ink droplets for information recording; a compensation signal generator connected to said clock signal circuit for generating a predetermined compensation signal with an amount for cancelling the influence given to the charge of information recording ink droplets due to charging ink droplets by the ink droplets charged by the annex signal voltage, and with the same cycle and phase as the annex signal and the information recording signal, respectively; and circuit means having at least a synthesizing circuit for synthesizing the outputs of said three generator circuits and applying the synthesized output to said charging electrodes.

Claim 8

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce ink droplets flying toward a recording medium; an electro-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink droplets; and a clock signal circuit connected to said HF power source; wherein there is provided an information recording signal generator for generating an information recording signal voltage in response to a clock signal produced by said clock signal circuit in order to charge each ink droplet spaced with a predetermined interval with an electric charge according to a deflection amount for information recording; an annex signal generator for generating an annex signal voltage with a predetermined value in response to the clock signal of said clock signal circuit in order to provide a constant electric charge corresponding to a deflection amount for a droplet deflection sensitivity detecting signal and a phase detecting signal with a predetermined cycle to droplets located between the ink droplets for information recording; a compensation signal generator connected to said clock signal circuit for generating a predetermined compensation signal with an amount for cancelling the influence given to the charge of information recording ink droplets due to charging ink droplets by the ink droplets charged by the annex signal voltage, and with the same cycle and phase as the annex signal and the information recording signal, respectively; and circuit means having at least a synthesizing circuit for synthesizing the outputs of said three generator circuits and applying the synthesized output to said charging electrodes.

Claim 9

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce ink droplets flying toward a recording medium; an electrode-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink droplets; and a clock signal circuit connected to said HF power source; wherein there is provided an information recording signal generator for generating an information recording signal voltage in response to a clock signal produced by said clock signal circuit in order to charge each ink droplet arranged alternately with an electric charge according to a deflection amount for information recording; an annex signal generator for generating an annex signal voltage with a predetermined value in response to the clock signal of said clock signal circuit in order to provide a predetermined electric charge corresponding to a deflection amount for a droplet deflection sensitivity detecting signal and a phase detecting signal with a predetermined cycle of droplets located between the ink droplets for information recording; a compensation signal generator connected to said clock signal circuit for generating a predetermined compensation signal with an amount for cancelling the influence given to the charge of information recording ink droplets due to charging ink droplets by the ink droplets charged by the annex signal voltage, and with the same cycle as the annex signal and with the same phase as the information recording signal following the ink droplet charged on the basis of the annex signal; and circuit means having at least a synthesizing circuit for synthesizing the outputs of said three generator circuits and applying the synthesized output to said charging electrode.

Claim 10

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce ink droplets flying toward a recording medium; an electrode-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink droplets; and a clock signal circuit connected to said HF power source; wherein there is provided an information recording signal generator for generating an information recording signal voltage in response to a clock signal produced by said clock signal circuit in order to charge each ink droplet arranged alternately with an electric charge according to a deflection amount for information recording; an annex signal generator for generating an annex signal voltage with a predetermined value in response to the clock signal of said clock signal circuit in order to provide a predetermined electric charge corresponding to a deflection amount for a droplet deflection sensitivity detecting signal and a phase detecting signal with a predetermined cycle of droplets located between the ink droplets for information recording; a compensation signal generator connected to said clock signal circuit for generating a predetermined compensation signal with an amount for cancelling the influence given to the charge of information recording ink droplets due to charging ink droplets by the ink droplets charged by the annex signal voltage, and with the same cycle as the annex signal and with the same phase as the information recording signal following the ink droplet charged on the basis of the annex signal; and circuit means having at least a synthesizing circuit for synthesizing the outputs of said three generator circuits and applying the synthesized output to said charging electrode.

Claim 11

An ink jet printer as claimed in claim 7, wherein said information recording signal generator has a flip-flop connected between said clock signal circuit and said information recording signal generator, said annex signal generator having two flip-flops connected in series between said clock signal circuit and said annex signal generator, and said compensation signal generator.

Claim 12

An ink jet printer as claimed in claim 8, wherein the flip-flops connected in said annex signal generator are arranged such that the input terminal of the flip-flop at a rear stage is connected to the output terminal Q of the flip-flop at a front stage, and the flip-flops connected in said compensation signal generator are arranged such that the input terminal of the flip-flop at a rear stage is connected to the output terminal Q of the flip-flop at a front stage.

Claim 13

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce a series of ink droplets flying toward a recording medium; an electro-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink particles; an information recording signal generator for generating an information recording signal voltage, in response to a clock signal generated on the basis of the output of said HF power source to be coupled to said charging electrode so as to impart an electric charge to each (2n-1)th ink droplet in said series of droplets which is representative of information to be recorded on said recording medium, where n is an integer greater than zero; an annex signal generator for generating an annex signal voltage, for a droplet deflection sensitivity detecting signal and a phase detecting signal in response to said clock signal, to be coupled to said charging electrode so as to impart an electric charge to each (4n-2)th droplet in said series of droplets; a compensation signal generator for generating a predetermined compensation signal voltage, for cancelling the influence given to the charge of information recording ink droplets due to charging each (4n-2)th ink droplet by the annex signal voltage on the basis of said clock signal, to be coupled to said charging electrode so as to impart a compensating electric charge to each (4n-1)th droplet in said series of droplets; and means for combining the respective signal voltages generated by said information recording signal generator, said annex signal generator and said compensation signal generator and applying the resulting signal voltage to said charging electrode.

Claim 14

An ink jet printer comprising: means for jetting pressured ink out of a nozzle to produce a series of ink droplets flying toward a recording medium; an electro-mechanical vibrating element for vibrating said nozzle to regularly separate said ink droplets; an HF power source for energizing said electro-mechanical vibrating element; a charging electrode for charging said ink droplets; deflecting electrodes for establishing a deflecting electric field in the flight path of said ink particles; an information recording signal generator for generating an information recording signal voltage, in response to a clock signal generated on the basis of the output of said HF power source to be coupled to said charging electrode so as to impart an electric charge to each (2n-1)th ink droplet in said series of droplets which is representative of information to be recorded on said recording medium, where n is an integer greater than zero; an annex signal generator for generating an annex signal voltage, for a droplet deflection sensitivity detecting signal and a phase detecting signal in response to said clock signal, to be coupled to said charging electrode so as to impart an electric charge to each (4n-2)th droplet in said series of droplets; a compensation signal generator for generating a predetermined compensation signal voltage, for cancelling the influence given to the charge of information recording ink droplets due to charging each (4n-2)th ink droplet by the annex signal voltage on the basis of said clock signal, to be coupled to said charging electrode so as to impart a compensating electric charge to each (4n-1)th droplet in said series of droplets; and means for combining the respective signal voltages generated by said information recording signal generator, said annex signal generator and said compensation signal generator and applying the resulting signal voltage to said charging electrode.

Claim 15

An ink jet printer according to claim 10, where the polarity of the charge imparted to respective ink droplets by said annex signal generator and by said compensation signal generator is opposite to the polarity of the charge imparted to a respective ink droplet by said information recording signal generator.