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:
Jul. 01, 2014
Filed:
May. 10, 2012
Yuji Ieiri, Kanagawa, JP;
Yuji Ieiri, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image forming apparatus includes: a plurality of heads, each of which includes a capacitive load used as an actuator for discharging ink; a drive-voltage generating circuit that outputs a drive voltage to be applied to the actuator and includes a plurality of current amplifying circuits; and a plurality of head drivers that control the actuators of the heads. Each of the current amplifying circuits is configured to include a plurality of bipolar transistors and to operate so as to equalize output current loads of the bipolar transistors included in the current amplifying circuits, and waveforms of the drive voltages output from the current amplifying circuits are combined to form a combined waveform of the drive voltages to be applied to each of the head drivers.