Liquid discharge head and liquid discharge apparatus
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.
1 . 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.
2 . The liquid discharge head according to claim 1 , wherein:
the core end includes a groove on the outer side face of the core end, and
the elastic structure covers the groove.
3 . The liquid discharge head according to claim 1 , wherein:
the elastic structure is adhered to the core end with an adhesive.
4 . The liquid discharge head according to claim 1 , wherein:
the elastic structure is adhered to the concave in the core end.
5 . The liquid discharge head according to claim 1 , wherein:
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≤T 1 /T 2 ≤6, where
T 1 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
T 2 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.
6 . The liquid discharge head according to claim 1 , wherein:
the core end includes a convex portion surrounding the concave,
the convex portion protrudes from the concave toward the discharge port, and
the elastic structure includes a chamfer at a position corresponding to at least one of an outer peripheral end or an inner peripheral end of the convex portion of the core end.
7 . The liquid discharge head according to claim 1 , further comprising:
a plate including the discharge port, wherein
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 W 1 <W 2 , where
W 1 is a width of the flat portion of the elastic structure in a radial direction, and
W 2 is a width of the convex portion of the core end in the radial direction.
8 . The liquid discharge head according to claim 1 , wherein:
the elastic structure covers around a periphery of the outer side face of the core end.
9 . A liquid discharge apparatus comprising the liquid discharge head according to claim 1 .
10 . 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≤T 1 /T 2 ≤6, where
T 1 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
T 2 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.
11 . The liquid discharge head according to claim 10 , wherein:
the core end includes a groove on the outer side face of the core end, and
the elastic structure covers the groove.
12 . The liquid discharge head according to claim 10 , wherein:
the elastic structure is adhered to the core end with an adhesive.
13 . The liquid discharge head according to claim 10 , wherein:
the elastic structure is adhered to the concave in the core end.
14 . The liquid discharge head according to claim 10 , wherein:
the elastic structure includes a chamfer at a position corresponding to at least one of an outer peripheral end or an inner peripheral end of the convex portion of the core end.
15 . The liquid discharge head according to claim 10 , wherein:
the elastic structure covers around a periphery of the outer side face of the core end.
16 . A liquid discharge apparatus comprising the liquid discharge head according to claim 10 .
17 . 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 W 1 <W 2 , where
W 1 is a width of the flat portion of the elastic structure in a radial direction, and
W 2 is a width of the convex portion of the core end in the radial direction.
18 . A liquid discharge apparatus comprising the liquid discharge head according to claim 17 .