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:
Jan. 14, 1986
Filed:
Apr. 16, 1984
Applicant:
Inventor:
Kazumi Ishima, Kashiwa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219497 ; 219501 ; 323281 ;
Abstract
A drive circuit for controllably driving a heater which is used for maintaining ink in an ink jet printer at a predetermined temperature. A plurality of power sources are installed in the circuit each for supplying a voltage to the heater. The power sources are selectively connected to the heater by a plurality of output transistors and an error amplifier adapted to control switching actions of the output transistors. Diodes are interposed between the respective transistors and the error amplifier to enhance the linearity of the level of the voltage supplied to the heater.