# US 2018/0322909 A1 · Base unit and disk drive apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0322909 A1 - Document ID: US20180322909A1 - Status: Published application - Kind: A1 - Application number: 16/019,413 - Filed: 2018-06-26 - Published: 2018-11-08 - Earliest claimed: 2015-12-28 - Assignees: Western Digital Technologies, Inc. - Applicants: Western Digital Technologies, Inc. - Inventors: Jiro Kaneko; Takako Hayakawa; Kimihiko Sudo; Yuta Onobu - Web page: https://patentgrep.com/patent/US20180322909A1 ## CPC - G11B 33/1466: {sealing gaskets, (gasket in general F16J)} - G11B 25/043: {using rotating discs} - G11B 33/027: {Covers (G11B33/022 takes precedence; with means for guiding the record carrier G11B17/34)} - G11B 33/122: {Arrangements for providing electrical connections, e.g. connectors, cables, switches} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 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. ### Claim 7 (depends on 6) 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 6) 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. ### Claim 10 (depends on 6) 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.