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. 02, 2001
Filed:
Sep. 28, 1998
Masao Yaji, Tokyo, JP;
Oki Data Corporation, Tokyo, JP;
Abstract
An ink jet printer has a printhead formed of a piezoelectric element having an electrical capacitance with a known temperature characteristic. A memory stores a reference temperature Tref and a reference capacitance Cref of the printhead measured at the reference temperature. A capacitance measuring section measures a capacitance Cm of the printhead at a temperature Te when the printer is in use. A temperature computing section computes the temperature Te on the basis of the reference capacitance Cref, the measured capacitance value Cm, and the reference temperature Tref. A table lists various values of the temperatures and corresponding values of the drive voltages. An optimum value is selected from among the values of the drive voltage listed in the table and is used for driving the printhead at the selected temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile