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Ink injection type writing system using amplitude-modulated electrical signals
| Details |
Inventors: Hayami, Heijiro; Tsuchiya, Hiroyoshi; Yoshida, Kunio; Tsuda, Yukifumi; Kanno, Yoshimitsu;
Assignee: Matsushita Electric Industrial Company, Limited (JA)
Primary Examiner: Hartary; Joseph W.
Assistant Examiner:
Attorney, Agent or Firm: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.
An ink ejection system of the invention includes an electrical circuit generating sinusoidal wave pulses and a liquid applying unit operable to discharge the liquid in pulsed jets in response to the sinusoidal wave pulses. The circuit comprises means for generating a sinusoidal signal of constant amplitude and frequency higher than the highest instantaneous frequency of a video signal, and means for modulating the amplitude of the sinusoidal signal in accordance with the video signal to generate a signal containing no harmonic components. |
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DETAILED DESCRIPTION An object of the invention is to provide an ink ejection system which provides a sinusoidal signal amplitude-modulated by a video signal that permits reproduction of a sharply defined image.
According to the general aspect of the invention, there is provided an ink ejection system comprising a writing unit including a chamber, an inlet channel for supplying the chamber with liquid, an outlet channel, and an electromechanical transducer for generating pressure rises inthe liquid in the chamber to discharge the liquid in the form of droplets through the outlet channel to a surface, and an electrical circuit for generating signals with which the transducer is excited to generate the pressure rises, the circuit including, means for generating a sinusoidal signal of constant amplitude and frequency higher than the highest instantaneous frequency of a video signal, and means for modulating the amplitude of the sinusoidal signal in accordance with the video signal.
According to a specific aspect of the invention, there is provided an ink ejection system comprising a writing unit including a chamber, an inlet channel for supplying the chamber with liquid, an outlet channel, and an electromechanical transducer for generating pressure rises in the liquid in the chamber to discharge the liquid in a series of droplets through the outlet channel onto a surface, and an electrical drive circuit for generating signals with which the transducer is excited to generate the pressure rises, the circuit including means for generating a sinusoidal signal of constant amplitude and frequency higher than the highest instantaneous repetition frequency of the video signal, means for generating a sampling signal in step with a predetermined phase of the sinusoidal signal, sample-and-hold circuit means operable to sample the instantaneous value of the video signal with said sampling signal and to hold the sampled video signal until the next sampling signal occurs, and means for modulating the amplitude of the sinusoidal signal in accordance with the output pulse
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