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. 28, 1997
Filed:
Oct. 29, 1993
Applicant:
Inventors:
John Wade, Poway, CA (US);
Brian Canfield, San Diego, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
347 19 ; 347 57 ;
Abstract
A method for operating a thermal ink jet printer including a printhead having a sample resistor and ink firing heater resistors responsive to pulses provided to the printhead. The resistance of a sample resistor is read and the pad to pad resistance of the printhead is determined. The operating energy of the printhead is determined from a look-up table and the target power is determined from the target pulse width. The power supply voltage is determined from the target power and the power supply voltage is set. The operating power is determined and the operating pulse width is set based on the operating power and target energy.