Print head with liquid channels having movable valves

Details Print head with liquid channels having movable valves Print head with liquid channels having movable valves

2006-09-06

2009-12-29

Stephens, Juanita D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S065000

Reexamination Certificate

active

07637596

ABSTRACT:
In the prior art, ejection openings are formed of different materials having respective wettability levels Thus, ink may disadvantageously be drawn toward a more wettable material and ejected obliquely. Further, if ejection is carried out with a horizontally dripping liquid adhering to ejection opening edges and an edge of a roof plate forming a part of each ejection opening, the ink droplets may disadvantageously be ejected obliquely to the direction in which they are originally ejected. According to the present invention, the ejection openings are formed of the same material to prevent the ejecting direction from being affected by the difference in wettability. Further, a resin is raised from the ejection opening portion to prevent the horizontally dripping liquid adhering to an ejection opening periphery from contacting ejected ink droplets during ejection. As a result, the ejected ink droplets are not affected by the horizontally dripping liquid during ejection.

REFERENCES:
patent: 5278585 (1994-01-01), Karz et al.
patent: 6273556 (2001-08-01), Ishinaga et al.

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