Base unit and disk drive apparatus
A base member includes a recessed portion arranged to extend in radial directions and recessed upward from a lower surface of the base member, the radial directions being directions perpendicular to a vertical direction; and a hole portion arranged to pass through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface being a loop-shaped surface perpendicular to the vertical direction. A connector is arranged on a lower side of the recessed portion to cover the hole portion. An adhesive is arranged between the connector and the recessed portion. A minimum value of a gap distance between an outer end of the connector and an inner end of the recessed portion in a radial direction in which the outer end of the connector and the inner end of the recessed portion are opposed to each other with the adhesive therebetween is greater than a minimum value of a gap distance between an upper surface of the connector and the recessed portion loop-shaped surface in the vertical direction, in which the upper surface of the connector and the recessed portion loop-shaped surface are opposed to each other with the adhesive therebetween.
1. A base unit for use in a disk drive apparatus in which a gas with a density lower than that of air is sealed in a housing space defined by a base member and a cover fixed to each other, the base unit comprising:
the base member that supports a motor rotatable about a central axis extending in a vertical direction; and
a connector electrically connected to a wire in the housing space; wherein
the base member includes:
a recessed portion that extends in radial directions and is recessed upward from a lower surface of the base member, the radial directions being perpendicular or substantially perpendicular to the vertical direction; and
a hole portion that passes through the recessed portion in the vertical direction; wherein
the recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface perpendicular or substantially perpendicular to the vertical direction;
the connector is on a lower side of the recessed portion to cover the hole portion;
an adhesive is between the connector and the recessed portion; and
a minimum value of a gap distance between an outer end of the connector and an inner end of the recessed portion in a radial direction in which the outer end of the connector and the inner end of the recessed portion are opposed to each other with the adhesive therebetween is greater than a minimum value of a gap distance between an upper surface of the connector and the recessed portion loop-shaped surface in the vertical direction, in which the upper surface of the connector and the recessed portion loop-shaped surface are opposed to each other with the adhesive therebetween; wherein
the base member includes a collar portion that is recessed upward and projects in a radial direction from an outer circumference of the recessed portion;
an extent to which the collar portion is recessed is smaller than an extent to which the recessed portion loop-shaped surface is recessed in the recessed portion; and
the connector includes a projecting portion that projects in the radial direction from an outer circumference thereof to be provided in the collar portion.
2. The base unit according to claim 1 , wherein a surface of the adhesive on a side closer to the hole portion is located between the upper surface of the connector and the recessed portion loop-shaped surface.
3. The base unit according to claim 2 , wherein
the recessed portion loop-shaped surface includes a first recessed portion loop-shaped surface, and a second recessed portion loop-shaped surface on a side of the first recessed portion loop-shaped surface closer to the hole portion; and
the surface of the adhesive is located at the second recessed portion loop-shaped surface.
4. The base unit according to claim 1 , wherein at least a portion of a surface of the adhesive on a side opposite to a side closer to the hole portion is provided between the upper surface of the connector and the recessed portion loop-shaped surface.
5. A disk drive apparatus comprising:
the base unit of claim 1 ;
the cover;
the motor; and
an access portion that performs at least one of reading and writing of information from or to a disk supported by the motor; wherein
the motor and the access portion are accommodated in the housing space.
6. A base unit for use in a disk drive apparatus in which a gas with a density lower than that of air is sealed in a housing space defined by a base member and a cover fixed to each other, the base unit comprising:
the base member that supports a motor rotatable about a central axis extending in a vertical direction; and
a connector electrically connected to a wire in the housing space; wherein
the base member includes:
a recessed portion that extends in radial directions and is recessed upward from a lower surface of the base member, the radial directions being perpendicular or substantially perpendicular to the vertical direction; and
a hole portion that passes through the recessed portion in the vertical direction;
the recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface perpendicular or substantially perpendicular to the vertical direction;
the connector is on a lower side of the recessed portion to cover the hole portion;
an adhesive is between the connector and the recessed portion; and
a minimum value of a gap distance between an outer end of the connector and an inner end of the recessed portion in a radial direction in which the outer end of the connector and the inner end of the recessed portion are opposed to each other with the adhesive therebetween is greater than a minimum value of a gap distance between an upper surface of the connector and the recessed portion loop-shaped surface in the vertical direction, in which the upper surface of the connector and the recessed portion loop-shaped surface are opposed to each other with the adhesive therebetween; wherein
the recessed portion loop-shaped surface or each of the outer end of the connector and the inner end of the recessed portion have a degree of surface roughness greater than a degree of surface roughness of the upper surface of the connector.
7. The base unit according to claim 6 , wherein a surface of the adhesive on a side closer to the hole portion is defined between the upper surface of the connector and the recessed portion loop-shaped surface.
8. The base unit according to claim 7 , wherein
the recessed portion loop-shaped surface includes a first recessed portion loop-shaped surface, and a second recessed portion loop-shaped surface located on a side of the first recessed portion loop-shaped surface closer to the hole portion; and
the surface of the adhesive is located at the second recessed portion loop-shaped surface.
9. The base unit according to claim 6 , wherein at least a portion of a surface of the adhesive on a side opposite to a side closer to the hole portion is located between the upper surface of the connector and the recessed portion loop-shaped surface.
10. A disk drive apparatus comprising:
the base unit of claim 6 ;
the cover;
the motor; and
an access portion that performs at least one of reading and writing of information from or to a disk supported by the motor; wherein
the motor and the access portion are accommodated in the housing space.