Patent ID: 9085144
Filing Date: 2015-07-21
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a liquid chamber capable of storing liquid therein; a heat-generating element capable of heating the liquid inside the liquid chamber; and an ejection port through which the liquid is ejected by generation of bubbles in a case of generating the bubbles within the liquid by heat generation of the heat-generating element in a state where the liquid is stored in the liquid chamber, wherein the liquid ejection head has a block member which surrounds at least a part of an effective bubble-generating region involved with heat generation in the heat-generating element and which is formed so as to protrude from a plane in which the heat-generating element is formed in a direction in which the liquid is ejected, and the block member is arranged in a position where a distance of a position of an inner end part of the block member from an outer end part of the effective bubble-generating region is +2 μm or less, with an outward direction being set to be positive.