# US 2014/0153132 A1 · Spindle motor 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 2014/0153132 A1 - Document ID: US20140153132A1 - Status: Published application - Kind: A1 - Application number: 14/169,511 - Filed: 2014-01-31 - Published: 2014-06-05 - Earliest claimed: 2012-08-07 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Kazuhiro SATO; Masahiro SHIRAISHI; Takayuki ISHINO; Akihiro YUDATE; Takuro MATSUMOTO; Toshihiro AKIYAMA - Web page: https://patentgrep.com/patent/US20140153132A1 ## CPC - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - G11B 19/2009: {Turntables, hubs and motors for disk drives; Mounting of motors in the drive (means for clamping of disk to turntable G11B17/022 and subgroups)} - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 2203/06: Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations - H02K 2211/03: Machines characterised by circuit boards, e.g. pcb - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - 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 of a motor includes a base through-hole extending through a bottom portion thereof. Two or more lead wires extending from coils pass through the base through-hole. Thus, as compared with a case where the lead wires pass through different base through-holes respectively, it is possible to reduce the number of the base through-holes. Accordingly, it is possible to minimize or prevent a reduction in the rigidity of the base member. Insulating sheet portions are arranged on the lower and upper surfaces of the base member. Each insulating sheet portion includes an overhang portion which overlaps with the base through-hole when seen in a plan view. The lead wires extending from the coils are led out toward the lower surface of the base member through holes, cutouts, or slits defined in the overhang portion. This makes it possible to easily distinguish the led-out lead wires from each other. ## Claims ### Claim 1 A spindle motor, comprising: a stationary unit; and a rotary unit supported to rotate about a center axis extending up and down; wherein the stationary unit includes a base member made of metal, an armature provided with a plurality of coils and positioned above the base member, and a circuit substrate arranged on a lower surface of the base member; the rotary unit includes a magnet opposed to the armature with a gap therebetween; the base member includes a ring-shaped bottom portion positioned below the armature, at least one base through-hole extending through the bottom portion and a base groove portion arranged on a lower surface of the bottom portion to extend radially outward from a lower end portion of the base through-hole; a first insulating sheet portion, which is defined by a portion of the circuit substrate or a member of the circuit substrate, is arranged on a bottom surface of the base groove portion; a second insulating sheet portion is arranged on an upper surface of the bottom portion; the first insulating sheet portion or the second insulating sheet portion includes an overhang portion overlapping with a lower opening or an upper opening of the base through-hole when seen in a plan view; a plurality of lead wires electrically connected to the coils extends from the coils; the overhang portion includes at least one hole, at least one cutout, or at least one slit, through each of which at least one of the lead wires passes, a total number of the at least one hole, the at least one cutout, or the at least one slit is two or more; and the lead wires are arranged to pass through the upper opening of the base through-hole, the overhang portion, and the lower opening of the base through-hole and are arranged to extend to the circuit substrate through the base groove portion, the lead wires connected to the circuit substrate. ### Claim 2 (depends on 1) The spindle motor of claim 1, wherein the overhang portion includes a first overhang portion defined in the first insulating sheet portion and a second overhang portion defined in the second insulating sheet portion; only one of the first overhang portion and the second overhang portion includes the at least one hole, the at least one cutout, or the at least one slit. ### Claim 3 (depends on 2) The spindle motor of claim 2, wherein the second overhang portion includes the at least one hole, the at least one cutout, or the at least one slit; and radial inner ends of the at least one hole, the at least one cutout, or at least one slit of the second overhang portion are positioned radially inward of a radial inner end of the first overhang portion. ### Claim 4 (depends on 2) The spindle motor of claim 2, wherein the first overhang portion includes the at least one hole, at least one cutout, or at least one slit; and radial outer ends of the at least one hole, the at least one cutout, or the at least one slit of the first overhang portion are positioned radially outward of a radial outer end of the second overhang portion. ### Claim 5 (depends on 1) The spindle motor of claim 1, wherein the overhang portion includes a first overhang portion defined in the first insulating sheet portion and a second overhang portion defined in the second insulating sheet portion; each of the first overhang portion and the second overhang portion includes the at least one hole, the at least one cutout, or the at least one slit; and the at least one hole, the at least one cutout, or the at least one slit of the first overhang portion axially overlap with the at least one hole, the at least one cutout, or the at least one slit of the second overhang portion. ### Claim 6 (depends on 1) The spindle motor of claim 1, wherein at least one of the lead wires makes contact with the overhang portion. ### Claim 7 (depends on 1) The spindle motor of claim 1, wherein the overhang portion includes the at least one hole or the at least one cutout, and a minimum diameter of the at least one hole or a minimum width of the at least one cutout is larger than the diameter of the lead wires. ### Claim 8 (depends on 1) The spindle motor of claim 1, wherein a circumferential maximum width of the at least one slit is smaller than the diameter of the lead wires. ### Claim 9 (depends on 1) The spindle motor of claim 1, wherein the overhang portion includes the at least one hole and the at least one cutout. ### Claim 10 (depends on 9) The spindle motor of claim 9, wherein the overhang portion includes two of the at least one hole arranged at peripheral sides and one of the at least one cutout positioned between the two of the at least one hole. ### Claim 11 (depends on 10) The spindle motor of claim 10, wherein a minimum diameter of the two of the at least one hole and a minimum width of the at least one cutout are larger than a diameter of the lead wires. ### Claim 12 (depends on 11) The spindle motor of claim 11, wherein at least one of the lead wires makes contact with the overhang portion. ### Claim 13 (depends on 1) The spindle motor of claim 1, wherein the lead wires passes through the at least one hole, the at least one cutout, or the at least one slit, respectively. ### Claim 14 (depends on 1) The spindle motor of claim 1, wherein the stationary unit further includes a sealing material arranged to seal the base through-hole. ### Claim 15 (depends on 14) The spindle motor of claim 14, wherein the sealing material is arranged within the base through-hole and the base groove portion. ### Claim 16 (depends on 1) The spindle motor of claim 1, wherein the first insulating sheet portion is a portion of the circuit substrate, and an axial thickness of the first insulating sheet portion is smaller than an axial thickness of a remaining portion of the circuit substrate. ### Claim 17 (depends on 1) A disk drive apparatus, comprising: the spindle motor of claim 1; an access unit arranged to perform at least one of information reading and writing tasks with respect to a disk supported on the rotary unit of the spindle motor; and a housing arranged to accommodate the spindle motor and the access unit.