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. 21, 1992
Filed:
Feb. 08, 1991
Rajeev Badyal, Corvallis, OR (US);
Sam Mahjouri, Corvallis, OR (US);
Donald M Reid, Corvallis, OR (US);
Michael J Gilsdorf, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A circuit for controlling the energy delivered to a heater resistor of a thermal inkjet printhead. The circuit includes a decoder for receiving an address for the heater resistor in a multiplexed environment. When the heater resistor is addressed, the output of the decoder is level shifted through a pair of inverters and transmitted to the gate of a PMOS driver that delivers the energy to the heater resistor. The PMOS driver responds to the voltage level of the adjacent inverter output in setting the level of the driver output voltage that is applied to the resistor. Feedback circuitry in the form of an analog or digital comparator compares the driver output voltage against a reference voltage. The comparator's output signal is fed back through the level shifter as the inverter output that is applied to the gate of the PMOS driver. The inverter output adjusts the driver output voltage so as to maintain the voltage across the heater resistor at a level that delivers a desired amount of energy to the heater resistor.