Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1991-02-08
1992-01-21
Fuller, Benjamin R.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346140R, 346 76PH, 400120, B41J 205, B41J 2355
Patent
active
050831372
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.
REFERENCES:
patent: 4587530 (1986-05-01), Noguchi
patent: 4590484 (1986-05-01), Matsushita
patent: 4590488 (1986-05-01), Sullivan
patent: 4887098 (1989-12-01), Hawkins et al.
patent: 4947192 (1990-08-01), Hawkins et al.
Badyal Rajeev
Gilsdorf Michael J.
Mahjouri Sam
Reid Donald M.
Bobb Alrick
Fuller Benjamin R.
Hewlett--Packard Company
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