# US 7,609,485 B2 · Head gimbal assembly and head stack assembly having accurate dimensions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,485 B2 - Document ID: US7609485B2 - Status: Granted - Kind: B2 - Application number: 10/901,636 - Filed: 2004-07-28 - Published: 2005-03-17 - Granted: 2009-10-27 - Earliest claimed: 2003-09-12 - Assignees: Hitachi Global Storage Technologies Netherlands B.V. - Inventors: Satoshi Matsumura; Masanori Iwamoto - Web page: https://patentgrep.com/patent/US7609485B2 ## CPC - G11B 5/4833: {Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head (G11B5/484 takes precedence)} - G11B 5/4813: {Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm (G11B5/484 takes precedence)} - G11B 5/4826: {Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56)} - 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 Embodiments of the invention provide a head gimbal assembly and a head stack assembly suitable for a miniature magnetic disk drive, and capable of being assembled in an accurate alignment during its fabrication. In one embodiment, a fixing member is disposed in contact with a pivot, an assembly formed by combining a head gimbal assembly and a carriage assembly is put on the pivot and pressed in the direction of the arrow toward the fixing member, and is fastened to the pivot with a nut. Since the head gimbal assembly is provided with a hole to receive the pivot therein provided with two straight edges, the relative positions of the turning axis of the pivot, the head gimbal assembly and the carriage assembly are adjusted properly so that clearances between the parts are absorbed. ## Claims ### Claim 1 A head gimbal assembly comprising: a head arm consisting of a mounting hole having both rounded and only two straight edges and configured to receive a carriage support shaft therein, wherein the carriage support shaft is cylindrical and has parallel flat surfaces, wherein extensions of the two straight edges meet at right angles; a flexure having one end attached to the head arm and the other end including a gimbal; and a load beam attached to the flexure; wherein when the carriage support shaft is received in the mounting hole, the head gimbal assembly is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft. ### Claim 2 (depends on 1) The gimbal assembly according to claim 1, wherein the flexure is provided integrally with wiring lines. ### Claim 3 A head stack assembly comprising: a cylindrical carriage support shaft having parallel flat surfaces; a carriage assembly having a mounting part mounted on the carriage support shaft, and a coil; and a head gimbal assembly including a head arm consisting of a hole having both rounded and only two straight edges and configured to receive the carriage support shaft therein, wherein extensions of the two straight edges meet at right angles; wherein when the carriage support shaft is received in a mounting hole, the head gimbal assembly is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft. ### Claim 4 (depends on 3) The head stack assembly according to claim 3, wherein the carriage assembly includes at least two bosses at least in two parts of the mounting part mounted on the carriage support shaft for positioning the head arm on the carriage assembly. ### Claim 5 A head stack assembly comprising: a cylindrical carriage support shaft having parallel flat surfaces; a carriage assembly having a mounting part mounted on the carriage support shaft, and including a coil; and a head gimbal assembly consisting of a head arm including a hole having both rounded and only two straight edges and configured to receive the carriage support shaft therein, a flexure having one end attached to the head arm, and a load beam attached to the flexure, wherein extensions of the straight edges of the mounting hole, receiving the carriage support shaft, of the head arm meet at right angles; wherein when the carriage support shaft is received in the mounting hole, the head gimbal assembly is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft. ### Claim 6 (depends on 5) The head stack assembly according to claim 5, wherein the flexure is provided integrally with wiring lines. ### Claim 7 (depends on 5) The head stack assembly according to claim 5, wherein the carriage assembly includes at least two bosses at least two parts of the mounting part mounted on the carriage support shaft for positioning the head arm on the carriage assembly. ### Claim 8 A magnetic disk drive comprising: a head gimbal assembly consisting of a head arm provided with a mounting hole having rounded and only two straight edges and configured to receive a carriage support shaft therein, a flexure having one end attached to the head arm, and a load beam attached to the flexure, wherein the carriage support shaft is cylindrical and has parallel flat surfaces; and a magnetic disk for writing information to and reading information from the magnetic disk; wherein when the carriage support shaft is received in the mounting hole, the head gimbal assembly is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft; wherein extensions of the two straight edges of the mounting hole of the head arm receiving the carriage support shaft therein meet at right angles. ### Claim 9 A magnetic disk drive comprising: a head stack assembly consisting of a cylindrical carriage support shaft having parallel flat surfaces, a carriage assembly having a mounting part mounted on the carriage support shaft, and a coil, and a head gimbal assembly provided with a mounting hole having both rounded and only two straight edges and configured to receive the carriage support shaft, wherein extensions of the straight edges of the mounting hole of the head gimbal assembly receiving the carriage support shaft meet at right angles; and a magnetic disk to which the magnetic head write information and from which the magnetic head read information; wherein when the carriage support shaft is received in the mounting hole, the head gimbal assembly is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft. ### Claim 10 (depends on 9) The magnetic disk drive according to claim 9, wherein the carriage assembly includes at least two bosses at least in two parts of the mounting part mounted on the carriage support shaft for positioning the head gimbal assembly on the carriage assembly. ### Claim 11 A magnetic disk drive comprising: a cylindrical carriage support shaft having parallel flat surfaces; a carriage assembly having a mounting part mounted on the carriage support shaft, and a coil; a head arm consisting of a mounting hole having both rounded and only two straight edges and configured to receive the carriage support shaft therein, wherein extensions of the straight edges of the mounting hole of the head arm receiving the carriage shaft meet at right angles; a flexure having one end attached to the head arm and the other end including a gimbal; a load beam attached to the flexure and capable of loading the gimbal; a magnetic head attached to the gimbal; and a magnetic disk to which the magnetic head write information and from which the magnetic head read information wherein when the carriage support shaft is received in the mounting hole, and the head arm is capable of rotating and locking into a position relative to the straight edges of the mounting hole and the flat surfaces of the carriage support shaft. ### Claim 12 (depends on 11) The magnetic disk drive according to claim 11, wherein the flexure is provided integrally with wiring lines. ### Claim 13 (depends on 11) The magnetic disk drive according to claim 11, wherein the carriage assembly includes at least two bosses at least in two parts of the mounting part mounted on the carriage support shaft for positioning the head arm on the carriage assembly.