Patent Number: 6,168,252

Title: Ink jet printer

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.

Inventors: Yaji; Masao (Tokyo, JP)

Assignee: Oki Data Corporation

International Classification: B41J 2/045 (20060101); B41J 029/38 ()

Expiration Date: 01/02/2018