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:
May. 24, 1977
Filed:
Mar. 28, 1975
Sharp Kabushiki Kaisha, Osaka, JA;
Abstract
In ink jet system printers of the charge amplitude controlling type, it is required, to ensure stable printing, that ink drop separation (drop formation) is timed to be in agreement with the application of charging signals. To this end, there are provided phase detecting signals having a period which is an integral multiple of the period of the exciting signals for the ultra-sonic vibrator attached to a jet nozzle, and which phase detecting signals are of opposite polarity to the charging signals. Moreover, in the printing operation, there are provided phase detecting ink drops which are charged by the phase detecting signals, in addition to printing ink drops. After the charge amplitude on the phase detecting drops is sensed, the phase detecting signals are controlled in a manner that the charge amplitude on the phase detecting drops takes the maximum value at all times. The phases of the charging signals are also controlled in a manner to enable the application thereof to the generated ink drops in the optimum phase relation.