Ink jet printhead with improved operation

Details Ink jet printhead with improved operation Ink jet printhead with improved operation

1997-01-21

1998-12-15

Hartary, Joseph

Incremental printing of symbolic information

Ink jet

Controller

347 43, 347 85, B41J 2175, B41J 29377

Patent

active

058502343

ABSTRACT:
An ink jet printhead is disclosed which has improved printhead cooling thereby improving operating efficiency. The printhead is constructed so that the manifold bringing ink from an ink reservoir into an ink inlet to the printer directly contacts the thermally conductive surface of the substrate in which the heater elements are formed- The cooler ink removes some of the accumulated heat from the heater substrate and is subsequently ejected. In one embodiment the printhead comprises an upper channel substrate which is bonded to a lower heater substrate which is formed with a ledge which extends past the rear face of the channel substrate. The channel substrate has an ink inlet formed into its rear face and adjacent to an extended portion of the heater silicon surface. An ink reservoir brings ink to the printhead via an ink manifold which is sealed against the exposed silicon surface and against the side of the ink inlet. In a second embodiment, the formation of an ink inlet at the rear face enables the construction of a compact multicolor sideshooting printhead with 2 rows of nozzles.

REFERENCES:
patent: Re32572 (1988-01-01), Hawkins et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4601777 (1986-07-01), Hawkins et al.
patent: 4638337 (1987-01-01), Torpey et al.
patent: 4675693 (1987-06-01), Yano
patent: 5017941 (1991-05-01), Drake
patent: 5066964 (1991-11-01), Fukuda
patent: 5459498 (1995-10-01), Seccomme

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