Liquid discharge head and liquid discharge apparatus
AssigneeRicoh Company, Ltd.
InventorsMakito Nakashima, Kiyoshi Amari, Toshihiro Kanematsu, Shusei Murai, Tatsumi Suzuki, Hiroshi Wada
Life of this patent
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Abstract
A liquid discharge head includes: a discharge port, from which a liquid is to be discharged; and an openably closing valve configured to move in a moving direction toward the discharge port to openably close the discharge port, the openably closing valve including a core, wherein the core has a core end at one end of the core opposing the discharge port, the core end has: a concave in the core end, the concave recessed in a direction opposite to the discharge port; and an elastic member covering the concave and an outer side face of the core end continuously.
Claims18
A liquid discharge head, comprising:
- a discharge port, from which a liquid is to be discharged;
- and
- an openably closing valve to move in a moving direction toward the discharge port to openably close the discharge port, the openably closing valve including a core, wherein:
- the core includes a core end at one end of the core opposing the discharge port, and
- the core end includes:
- a concave in the core end, the concave recessed in a direction opposite to the discharge port and having a cylindrical inner face along the moving direction;
- and
- an elastic structure covering the concave and an outer side face of the core end continuously, the elastic structure being in the concave without a gap.
A liquid discharge head, comprising:
- a discharge port, from which a liquid is to be discharged;
- and
- an openably closing valve to move in a moving direction toward the discharge port to openably close the discharge port, the openably closing valve including a core, wherein:
- the core includes a core end at one end of the core opposing the discharge port,
- the core end includes:
- a concave in the core end, the concave recessed in a direction opposite to the discharge port;
- and
- an elastic structure covering the concave and an outer side face of the core end continuously,
- the core end includes a convex portion surrounding the concave,
- the convex portion protrudes from the concave toward the discharge port, and
- a ratio of thicknesses of the elastic structure satisfies 1.6≤T1/T2≤6, where
- T1 is a first thickness of a first portion of the elastic structure at the deepest end of the concave of the core end in the moving direction of the openably closing valve, and
- T2 is a second thickness of a second portion of the elastic structure at the convex portion of the core end in the moving direction of the openably closing valve.
A liquid discharge head, comprising:
- a discharge port, from which a liquid is to be discharged;
- an openably closing valve to move in a moving direction toward the discharge port to openably close the discharge port, the openably closing valve including a core;
- and
- a plate including the discharge port, wherein:
- the core includes a core end at one end of the core opposing the discharge port,
- the core end includes:
- a concave in the core end, the concave recessed in a direction opposite to the discharge port;
- and
- an elastic structure covering the concave and an outer side face of the core end continuously,
- the core end includes a convex portion surrounding the concave of the core end,
- the elastic structure includes a flat portion opposing the plate,
- the flat portion is closer to the plate than the convex portion, and
- the elastic structure and the core end satisfy W1<W2, where
- W1 is a width of the flat portion of the elastic structure in a radial direction, and
- W2 is a width of the convex portion of the core end in the radial direction.
Dependencies are inferred from the claim text.