Temperature control transducer and MOS driver for thermal ink je

Details Temperature control transducer and MOS driver for thermal ink je Temperature control transducer and MOS driver for thermal ink je

1990-07-26

1992-01-14

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

338320, 357 59, B41J 205

Patent

active

050814737

ABSTRACT:
A transducer for a thermal ink jet printhead has a primary heating region having a tantalum layer, a silicon nitride layer and a polysilicon resistor layer. An n.sup.- drift layer resistor serves as a secondary heating region and a field layer of silicon dioxide acts as an insulator. The field layer is sandwiched between the primary heating region and the secondary heating region. The secondary heating region by heating the field layer causes the heat generated in the primary heating region to be directed toward ink which lies above the primary heating region. An electrical contact connects the polysilicon resistor layer of the primary heating region to a driving transistor located on the same silicon wafer as the transducer. The driving transistor has a field oxide layer sandwiched between an n.sup.- drift layer and a field plate layer, the field plate layer causing secondary pinch off of the n.sup.- drift layer thus enabling higher operating voltages.

REFERENCES:
patent: 4429321 (1984-01-01), Matsumoto
patent: 4472875 (1984-09-01), Christian et al.
patent: 4532530 (1985-07-01), Hawkins
patent: 4539571 (1985-09-01), Suzuki
patent: 4620212 (1986-10-01), Ogasawara
patent: 4623903 (1986-11-01), Hashimoto
patent: 4719477 (1988-01-01), Hess
patent: 4769527 (1988-09-01), Hart et al.
patent: 4947192 (1990-08-01), Hawkins

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