Liquid ejection head and method of manufacturing liquid ejection head
A liquid ejection head includes: a housing; an element substrate disposed on a first surface of the housing and including an energy generation element to eject a liquid; a relay wiring member disposed on a second surface at a position protruding in a liquid ejection direction more than the first surface and surrounding the element substrate; a lead connecting the element substrate with the relay wiring member; a filling portion provided between the housing and a side surface of the element substrate; a connection portion surrounded between the housing and the element substrate, connected with the filling portion, and adjacent to the lead; and a sealant sealing the filling portion, the connection portion, and the lead, in which a distance between the housing and the element substrate is smaller in a portion adjacent to the second surface than in a portion between the first surface and the second surface.
1 . A liquid ejection head, comprising:
a housing;
an element substrate that is disposed on a first surface of the housing and comprises an energy generation element to eject a liquid;
a relay wiring member that is disposed on a second surface at a position protruding in a liquid ejection direction more than the first surface of the housing and that surrounds the element substrate;
a lead that electrically connects the element substrate with the relay wiring member;
a filling portion that is provided between the housing and a side surface of the element substrate in a planar view from the liquid ejection direction;
a connection portion that is surrounded between the housing and the element substrate, connected with the filling portion, and adjacent to the lead; and
a sealant that seals the filling portion, the connection portion, and the lead, wherein
a distance between the housing and the element substrate in a direction parallel to the first surface in the connection portion is shorter in a portion adjacent to the second surface than in a portion between the first surface and the second surface, and
in the connection portion, the housing comprises an inclined surface connected with the first surface and the second surface.
2 . The liquid ejection head according to claim 1 , wherein
the element substrate comprises an electric connection portion electrically connected with the lead, and the sealant seals the electric connection portion.
3 . The liquid ejection head according to claim 1 , wherein
the distance between the housing and the element substrate in the direction parallel to the first surface in the connection portion becomes shorter from a portion adjacent to the first surface toward a portion adjacent to the second surface.
4 . A liquid ejection head, comprising:
a housing;
an element substrate that is disposed on a first surface of the housing and comprises an energy generation element to eject a liquid;
a relay wiring member that is disposed on a second surface at a position protruding in a liquid ejection direction more than the first surface of the housing and that surrounds the element substrate;
a lead that electrically connects the element substrate with the relay wiring member;
a filling portion that is provided between the housing and a side surface of the element substrate in a planar view from the liquid ejection direction;
a connection portion that is surrounded between the housing and the element substrate, connected with the filling portion, and adjacent to the lead; and
a sealant that seals the filling portion, the connection portion, and the lead, wherein
a distance between the housing and the element substrate in a direction parallel to the first surface in the connection portion is shorter in a portion adjacent to the second surface than in a portion between the first surface and the second surface, and
the element substrate comprises an inclined surface facing the housing in the connection portion.
5 . The liquid ejection head according to claim 1 , further comprising:
a second sealant that covers the lead.
6 . A method of manufacturing a liquid ejection head that comprises:
a housing;
an element substrate that is disposed on a first surface of the housing and comprises an energy generation element to eject a liquid;
a relay wiring member that is disposed on a second surface at a position protruding in a liquid ejection direction more than the first surface of the housing and that surrounds the element substrate;
a lead that electrically connects the element substrate with the relay wiring member;
a filling portion that is provided between the housing and a side surface of the element substrate in a planar view from the liquid ejection direction;
a connection portion that is surrounded between the housing and the element substrate, connected with the filling portion, and adjacent to the lead; and
a sealant that seals the filling portion, the connection portion, and the lead, the method comprising:
filling the sealant into the filling portion and applying the sealant to the lead from the filling portion through the connection portion, wherein
a distance between the housing and the element substrate in a direction parallel to the first surface in the connection portion is shorter in a portion adjacent to the second surface than in a portion between the first surface and the second surface, and
in the connection portion, the housing comprises an inclined surface connected with the first surface and the second surface.
7 . The method of manufacturing the liquid ejection head according to claim 6 , further comprising:
sealing by applying the sealant to an electric connection portion of the element substrate, the electric connection portion being electrically connected with the lead.
8 . The method of manufacturing the liquid ejection head according to claim 6 , further comprising:
sealing the lead by applying a second sealant over the lead.