The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1983
Filed:
Aug. 11, 1981
Hiroshi Ishii, Shiojiri, JP;
Epson Corporation, Nageno, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
Conditions in the ink supply, nozzle and passages of an ink jet printer head are maintained in a state of dynamic equilibrium by application of a continuous flow of intermediate pulses to the piezoelectric transducer in the ejection system. The intermediate pulses are combined with selectively applied ejection pulses. Only the occurrence of an ejection pulse causes a droplet to be propelled from the printer head nozzle to the recording media. The intermediate pulses differ from the ejection pulses in amplitude, period or rate of change of the signal and transducer deflection produced, and occur at a frequency which prevents a return of static pressure equilibrium in the ink system between pulses. Gradation in printing can be produced from variation in time between intermediate and ejection pulses.