Disk device with heat-assister having movement restrictor

1. A disk device comprising:

a magnetic disk;

a load beam having a first face facing the magnetic disk;

a flexure attached to the first face;

a head unit including:

a magnetic head attached to the flexure, configured to read and write information from and to the magnetic disk, and

a heat-assister attached to the magnetic head, configured to heat the magnetic disk; and

a first restrictor included in the head unit, configured to come in contact with at least one of the load beam and the flexure along with movement of the magnetic head away from the first face by a first distance.

2. The disk device according to claim 1 , wherein

the load beam has a second face opposite the first face and is provided with a hole opening to the first face and the second face,

the flexure has a third face facing the first face,

the heat-assister is attached to the magnetic head such that the heat-assister passes through the hole, and

the first restrictor is included in the heat-assister, and partially covers at least one of the second face and the third face.

3. The disk device according to claim 2 , wherein

the heat-assister comprises:

an outer shell; and

an optical device housed in the outer shell, configured to irradiate the magnetic disk with light, and

the first restrictor protrudes from the outer shell.

4. The disk device according to claim 3 , wherein

the first restrictor protrudes from the outer shell in a first direction along the first face, and

in the first direction, a total length of the heat-assister and the first restrictor is shorter than a length of the hole.

5. The disk device according to claim 3 , wherein

the first restrictor protrudes from the outer shell in a first direction along the first face, and

in the first direction, a total length of the heat-assister and the first restrictor is longer than a length of the hole, and the heat-assister is shorter in length than the hole.

6. The disk device according to claim 2 , wherein

the heat-assister comprises:

an outer shell; and

an optical device housed in the outer shell, configured to irradiate the magnetic disk with light, and

the first restrictor is attached to the outer shell.

7. The disk device according to claim 2 , wherein

the first restrictor partially covers the second face, and restricts the magnetic head from moving further from the first face beyond the first distance by coming in contact with the second face along with movement of the magnetic head away from the first face by the first distance.

8. The disk device according to claim 2 , wherein

the flexure includes:

a stationary part fixed to the load beam; and

an elastic part connected to the stationary, part and elastically movable with respect to the stationary part,

the magnetic head is attached to the elastic part, and

the first restrictor partially covers the third face of the stationary part, and restricts the magnetic head from moving further from the first face beyond the first distance by coming in contact with the third face of the stationary part along with movement of the magnetic head away from the first face by the first distance.

9. The disk device according to claim 1 , further comprising

a carriage that is movable relative to the magnetic disk; wherein

the load beam is connected to the carriage at an end in a second direction along the first face,

the magnetic head has a first end in the second direction and a second end in a third direction opposite to the second direction, and

the heat-assister is attached to the magnetic head at a position closer to the second end than to the first end.

10. The disk device according to claim 9 , further comprising

a second restrictor included in the flexure and separated from the first restrictor in the second direction, the second restrictor that restricts the magnetic head from moving further from the first face beyond a second distance by coming into contact with at least one of the load beam and the flexure along with movement of the magnetic head away from the first face by the second distance.

11. A disk device comprising:

a magnetic disk;

a load beam having a first face facing the magnetic disk and provided with a hole opening to the first face,

a flexure attached to the first face,

a magnetic head attached to the flexure, configured to read and write information from and to the magnetic disk; and

a heat-assister configured to heat the magnetic disk, the heat-assister comprising:

a base that is attached to the magnetic head such that the base extends from the magnetic head in an extending direction intersecting the first face, and passes through the hole, and

a protrusion that protrudes from the base in a protruding direction intersecting the extending direction and that partially covers at least one of the load beam and the flexure in the extending direction, wherein

of the heat-assister, a part including the protrusion has a larger cross-sectional area orthogonal to the extending direction than a part passing through the hole.