Random artificially perturbed liquid apparatus and method
First Claim
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1. An electrostatic fluid jet applicator of the type which utilizes random artificial perturbation of the fluid and including structure for producing such random perturbation which comprises:
- an electrically driven transducer coupled to said fluid;
a source of randomly varying signals; and
a frequency-stabilized oscillator connected so as to be frequency modulated by said randomly varying signals and to provide a corresponding randomly varying output connected to drive said transducer.
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Abstract
A frequency-stabilized oscillator is frequency modulated by band-limited random varying signals used to drive a suitable transducer randomly to and artificially perturb fluid jets in an electrostatic fluid jet applicator. Such random artificial pertubation is desirable (especially with longer cross-machine orifice plates) so as to obscure printing irregularities caused by standing wave or other phenomena. However, such random variations are best made with respect to a highly stabilized center frequency.
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Citations
21 Claims
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1. An electrostatic fluid jet applicator of the type which utilizes random artificial perturbation of the fluid and including structure for producing such random perturbation which comprises:
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an electrically driven transducer coupled to said fluid; a source of randomly varying signals; and a frequency-stabilized oscillator connected so as to be frequency modulated by said randomly varying signals and to provide a corresponding randomly varying output connected to drive said transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrostatic fluid jet applicator for applying fluid droplets to the surface of a relatively moving substrate, said applicator being of the type which includes random artificial perturbation means acoustically coupled to the fluid for artificially stimulating the formation of said droplets at a rate which is controllably varied, said random artificial perturbation means comprising:
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an electro-acoustic transducer; a band-limited source of randomly varying signals; and a phase locked loop (PLL) oscillator circuit having (1) a reference input supplied by a frequency-stable oscillator, (2) phase detector output and VCO input terminals with a low-pass loop filter connected thereto and also connected to receive said randomly varying signals and (3) a PLL output terminal supplying the output of the PLL oscillator adapted for use in driving said electro-acoustic transducer. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An electrostatic fluid jet application method of the type which utilizes random artificial perturbation of the fluid and including structure for producing such random perturbation which comprises:
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electrically driving a transducer coupled to said fluid; providing a source of randomly varying signals; and frequency modulating a frequency-stabilized oscillator by said randomly varying signals and providing a corresponding randomly varying output connected to drive said transducer. - View Dependent Claims (18, 19, 20, 21)
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Specification