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:
Dec. 17, 2002
Filed:
Jun. 04, 1999
Hiroyuki Ishikawa, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
When a print data reception circuit receives a print command, the print data reception circuit transmits data indicating this to a drive signal generating circuit and also transmits data indicating a desired member of ejections per dot to a drive signal correction circuit Based on memory content of a reference data storage circuit the drive signal generating circuit produces a reference drive signal, which includes a predetermined maximum number of ejection pulses for printing each single dot, and transmits it to the drive signal correction circuit The drive signal correction circuit produces a print drive signal by removing unnecessary ejection pulses from the reference drive signal, in accordance with the desired number of ejection pulses indicated in the print command, and than transmits the print drive signal to a charge/discharge circuit The charge/discharge circuit controls electric potential difference between electrodes in accordance with high and low levels of the application drive signal. The piezoelectric material between the electrodes and deforms according to the electric potential difference, so that a desired number of ink droplets are ejected.