Base unit and disk drive apparatus

Abstract

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 or directions parallel to these directions; 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.

What is claimed is: 
     
         1 . A base unit for use in a disk drive apparatus in which a gas having 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, the base member being arranged to support a motor rotatable about a central axis extending in a vertical direction; and   a connector electrically connected to a wire arranged in the housing space; wherein   the 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 the vertical direction or directions parallel to these directions; 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;   the 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; 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.   
     
     
         2 . The base unit according to  claim 1 , wherein the recessed portion loop-shaped surface is arranged to have a degree of surface roughness greater than a degree of surface roughness of the upper surface of the connector. 
     
     
         3 . The base unit according to  claim 1 , wherein each of the outer end of the connector and the inner end of the recessed portion is arranged to have a degree of surface roughness greater than a degree of surface roughness of the upper surface of the connector. 
     
     
         4 . The base unit according to  claim 1 , wherein the adhesive includes at least one of a glass bead and a metal filler, and wherein the recessed portion loop-shaped surface is arranged to have a degree of surface roughness greater than a degree of surface roughness of the upper surface of the connector. 
     
     
         5 . The base unit according to  claim 1 , wherein the adhesive includes at least one of a glass bead and a metal filler, and wherein each of the outer end of the connector and the inner end of the recessed portion is arranged to have a degree of surface roughness greater than a degree of surface roughness of the upper surface of the connector. 
     
     
         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.