Magnetic disk drive with carriage having bobbin supporting annular coil connected by connection members
View Patent ↗A magnetic disk drive comprises at least one magnetic head for reading and writing information on at least one magnetic disk, a carriage supporting the magnetic head over the magnetic disk for movement of the magnetic head about a predetermined shaft, an annular coil supported by a bobbin provided on the carriage and subjected to an electromagnetic force for driving the carriage. The drive further comprises a first connection member for joining the annular coil and the bobbin, an in-coil member arranged inside the annular coil, and a second connection member for joining the in-coil member and the annular coil. A modulus of longitudinal elasticity of the in-coil member is larger than that of the first or second connection member. The drive thus formed has the increased carriage rigidity, the improved positioning accuracy of a magnetic head and the increased recording capacity of the disk.
1. A magnetic disk drive comprising:
at least one magnetic head reading and writing information on at least one magnetic disk;
a carriage supporting the magnetic head over the magnetic disk for movement about a pivot shaft;
an annular coil supported by a bobbin provided on the carriage and subjected to an electromagnetic force for driving the carriage;
a first connection member joining the annular coil and the bobbin;
an in-coil member arranged on an inner side of the annular coil; and
a second connection member joining the in-coil member and the annular coil, said in-coil member having a modulus of longitudinal elasticity which is larger than a modulus of longitudinal elasticity of at least one of the first and second connection member.
2. A magnetic disk drive according to claim 1 , wherein said first connection member is formed to cover surfaces of the in-coil member that face in an axial direction of the pivot shaft.
3. A magnetic disk drive according to claim 2 , wherein said in-coil member is sealed in the second connection member.
4. A magnetic disk drive according to claim 3 , wherein said in-coil member is formed in a surface thereof with recessed and raised portions or with through-holes.
5. A magnetic disk drive according to claim 2 , wherein said in-coil member is formed in a surface thereof with recessed and raised portions or with through-holes.
6. A magnetic disk drive according to claim 1 , wherein said in-coil member is formed in a surface thereof with recessed and raised portions or with through-holes.
7. A magnetic disk drive according to claim 1 , wherein said in-coil member is a reinforcing plate.