US 10,328,699 B2 · Liquid ejection head and recording device using same

Abstract

A liquid ejection head includes an ejection hole surface where a plurality of nozzles ejecting liquid open. The ejection hole surface includes a nozzle arrangement region where the plurality of nozzles are arranged. Each nozzle includes an inversely tapered part where a cross-sectional area increases toward the ejection hole surface. A first nozzle is arranged at a center part of a predetermined direction of the nozzle arrangement region, while second nozzles are arranged at the end parts at the two sides in the predetermined direction. When viewed from the ejection hole surface side as “T”, the width of the first nozzle's inversely tapered part is larger than the widths of the inversely tapered parts of the second nozzles. In the nozzle arrangement region, the ejection hole surface includes a shape that the center part in the predetermined direction projects with respect to the end parts on the two sides.

Claims8

Dependent claims

A liquid ejection head, comprising:

a plurality of nozzles comprising a first nozzle and second nozzles;
and
a first surface at which the plurality of nozzles open, wherein
the first surface comprises a first region in which the plurality of nozzles are arranged,
each of the plurality of nozzles comprises an inversely tapered part where a cross-sectional area increases toward the first surface at least on the first surface side,
the first nozzle is arranged at a center part in a first direction of the first region, while the second nozzles are arranged at both end parts in the first direction of the first region,
when defining a width of the inversely tapered part when viewed from the first surface side as “T”, the width T of the first nozzle is larger than the widths T the second nozzles, and
in the first region, the first surface has a shape that the center part in the first direction projects with respect to the both end parts in the first direction.

5 more elements

A liquid ejection head, comprising:

a channel member comprising:
a plurality of nozzles comprising a first nozzle and second nozzles;
a first surface in which the plurality of nozzles open;
and
a second surface on the opposite side to the first surface, wherein
the first surface comprises a first region in which the plurality of nozzles are arranged,
each of the plurality of nozzles comprises an inversely tapered part where a cross-sectional area increases toward the first surface at least on the first surface side,
the first nozzle is arranged at a center part in a first direction of the first region, while the second nozzles are arranged at both end parts in the first direction of the first region,
when defining a width of the inversely tapered part when viewed from the first surface side as “T”, the width T of the first nozzle is larger than the widths T of the second nozzles,
the channel member comprises a plurality of stacked members including ones having different thermal expansion coefficients, and
the thermal expansion of the channel member at the first surface side is smaller than the thermal expansion of the channel member at the second surface side.

8 more elements

Dependencies are inferred from the claim text.

Liquid ejection head and recording device using same

Life of this patent

Liquid ejection head and recording device using same

Life of this patent

Abstract

Claims8