Ramp and magnetic disk device
View Patent ↗According to one embodiment, a ramp of a magnetic disk device, includes a ramp main body and a support bracket molded to be integrated as one body from resin and a metal reinforcement plate embedded in the ramp main body and opposing the support bracket. The reinforcement plate includes an opening filled with the resin and opposing a border portion between the ramp main body and the support bracket.
1 . A ramp of a magnetic disk device, comprising:
a ramp main body and a support bracket molded to be integrated as one body from resin; and
a metal reinforcement plate embedded in the ramp main body and opposing the support bracket, the reinforcement plate including a pair of side edges each extending in a first direction and opposing each other;
wherein
the support bracket extends in a second direction intersecting the first direction,
the reinforcement plate includes an opening filled with the resin and opposing a border portion between the ramp main body and the support bracket,
the border portion extends in the first direction by an amount equivalent to the thickness of the support bracket, and
in plan view, an interval between a periphery of the opening and the border portion is greater than zero and less than a thickness of the support bracket in the first direction.
2 . The ramp of claim 1 , wherein
the opening is open to one of the side edges.
3 . The ramp of claim 1 , wherein
the opening includes a side periphery opposing one of the side edges with an interval between them.
4 . The ramp of claim 1 , wherein
where an interval between an upper periphery of the opening and the border portion is referred to as TU, an interval between a lower periphery of the opening and the border portion is TL, an interval between a side periphery of the opening and the border portion is WR, an interval between other side periphery of the opening and the border portion is WL, and a thickness of the support bracket in the first direction is T 1 , the ramp has relationships: T1/5≤TU, TL, WR≤T1/2, and T1/5≤WL≤T1×2/3.
5 . A magnetic disk device comprising:
a rotatable magnetic disk;
an actuator which supports and drives a head to be movable with respect to the magnetic disk;
a ramp which holds the head at an unloaded position on an outer side of the magnetic disk,
wherein
the ramp comprises:
a ramp main body and a support bracket molded to be integrated as one body from resin; and
a metal reinforcement plate embedded in the ramp main body and opposing the support bracket, the reinforcement plate including a pair of side edges each extending in a first direction and opposing each other;
the support bracket extends in a second direction intersecting the first direction,
the reinforcement plate includes an opening filled with the resin and opposing a border portion between the ramp main body and the support bracket,
the border portion extends in the first direction by an amount equivalent to the thickness of the support bracket, and
in plan view, an interval between a periphery of the opening and the border portion is greater than zero and less than a thickness of the support bracket in the first direction.
6 . The magnetic disk device of claim 5 , wherein
the opening is open to one of the side edges.
7 . The magnetic disk device of claim 5 , wherein
the opening includes a side periphery opposing one of the side edges with an interval between them.
8 . The magnetic disk device of claim 5 , wherein
where an interval between an upper periphery of the opening and the border portion is referred to as TU, an interval between a lower periphery of the opening and the border portion is TL, an interval between a side periphery of the opening and the border portion is WR, an interval between other side periphery of the opening and the border portion is WL, and a thickness of the support bracket in the first direction is T 1 , the ramp has relationships: T1/5≤TU, TL, WR≤T1/2, and T1/5≤WL≤T1×2/3.