Thermal ink jet printhead with ink resistant heat sink coating

Details Thermal ink jet printhead with ink resistant heat sink coating Thermal ink jet printhead with ink resistant heat sink coating

1996-07-01

1998-05-12

Nguyen, Matthew V.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

298901, B41J 205

Patent

active

057513163

ABSTRACT:
A heat sink for a thermal ink jet printhead has improved resistance to the corrosive effects of ink by forming a chromate film on a copper plated metal substrate. In one described embodiment, a thermal ink jet printer is formed by bonding together a channel plate and a heater plate. Resistors and electrical connections are formed in the surface of the heater plate. The heater plate is bonded to a heat sink comprising a zinc substrate having a copper film plated on one surface. The copper plated heat sink is immersed in a chromic acid and water bath. Metal anodes are placed within the bath and a field is applied for a period of time sufficient to form a polymeric chromate film on the copper plated surface. The chromate film has improved resistance to ink corrosion and exhibits a stronger printhead to heat sink bonding strength.

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patent: 5258781 (1993-11-01), John
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patent: 5333007 (1994-07-01), Kneezel et al.
patent: 5519429 (1996-05-01), Zwjsen et al.
patent: 5585825 (1996-12-01), Kneezel et al.
Metal Finishing, vol. 92, No. 1A published 1994.

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