# US 6,724,560 B2 · Head assembly employing microactuator in recording medium drive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,724,560 B2 - Document ID: US6724560B2 - Status: Granted - Kind: B2 - Application number: 09/738,163 - Filed: 2000-12-15 - Published: 2001-10-25 - Granted: 2004-04-20 - Earliest claimed: 2000-04-20 - Assignees: Fujitsu Limited - Inventors: Shinji Koganezawa; Takahiro Imamura - Web page: https://patentgrep.com/patent/US6724560B2 ## CPC - G11B 5/5556: {with track following after a "seek"} - G11B 5/5552: {using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means} - H05K 1/023: {using auxiliary mounted passive components or auxiliary substances (printed passive components H05K1/16)} - 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) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A head suspension supporting a head at the tip end is allowed to swing at the tip end of a carriage in a recording disk drive. A microactuator is interposed between the head suspension and the carriage. A resistor is connected to the microactuator in serial. The microactuator is allowed to function as a capacitance. A combination of the microactuator and the resistor enables establishment of a so-called low pass filter. A high frequency noise involuntarily introduced in the driving voltage for the microactuator can be eliminated or removed from the driving voltage. Elimination of the high frequency noise enables a reliable prevention of the mechanical or physical resonance or vibration in the head suspension. A tracking action of the head related to a target recording track can reliably be stabilized. ## Claims ### Claim 1 A recording medium drive comprising: a recording medium; a head related to the recording medium; a driven member supporting the head; a support member designed to support the driven member for a relative movement; a microactuator interposed between the driven member and the support member so as to cause the relative movement between the driven member and the support member based on a driving voltage; a voltage source generating the driving voltage following variation in a feedback signal generated based on a position of the head relative to the recording medium; and a resistor interposed in serial between the voltage source and the microactuator, the resistor in combination with the microactuator establishing a low pass filter for eliminating from the driving voltage a high frequency component corresponding to a natural frequency of the driven member. ### Claim 2 (depends on 1) The recording medium disk according to claim 1, wherein said resistor is a chip resistor. ### Claim 3 (depends on 1) The recording medium disk according to claim 1, wherein said resistor is inserted in a driving signal line attached to the support member for carrying the driving voltage to the microactuator. ### Claim 4 (depends on 3) The recording medium disk according to claim 3, wherein said resistor is a chip resistor. ### Claim 5 A head assembly comprising: a plurality of heads; a plurality of driven members respectively supporting the head; a common support member designed to support the driven members for a relative movement; data signal lines attached to the support member for carrying a data signal of the head; a microactuator interposed between the individual driven member and the support member so as to cause the relative movement between the individual driven member and the support member based on a driving voltage; a driving signal line attached to the support member for carrying the driving voltage to the microactuator; and a resistor inserted in the driving signal line between the microactuator and a voltage source of the driving voltage, the resistor in combination with the microactuator establishing a low pass filter for eliminating from the driving voltage a high frequency component corresponding to a natural frequency of the driven member. ### Claim 6 (depends on 5) The head assembly according to claim 5, wherein said driving signal line comprises: a common driving signal line extending from the voltage source to a branch point so as to accept interposition of the resistor; and a plurality of branch driving signal lines respectively extending from the branch point to the individual microactuator. ### Claim 7 A head assembly comprising: a piezoelectric element deforming in response to supply of a driving voltage; first and second electrodes holding the piezoelectric element therebetween and leading the driving voltage to the piezoelectric element; a conductive adhesive layer interposed between the piezoelectric element and at least one of the first and second electrodes; a driven member fixed to the first electrode so as to support a head; a support member fixed to the second electrode; and a driving signal line connected to the first and second electrodes so as to lead the driving voltage to the first and second electrodes. ### Claim 8 (depends on 7) The head assembly according to claim 7, wherein the conductive adhesive layer serves as a resistance having a desired resistance value between the piezoolectric element and at least one of the first and second electrodes. ### Claim 9 (depends on 7) The head assembly according to claim 7, wherein the conductive adhesive layer is made of a cured conductive adhesive including conductive powder. ### Claim 10 A recording medium drive comprising: an enclosure defining an inner space; a recording medium disposed within the inner space; a head disposed within the inner space with respect to the recording medium; a driven member supporting the head; a support member designed to support the driven member for a relative movement; a microactuator interposed between the driven member and the support member so as to cause the relative movement between the driven member and the support member based on a driving voltage; an amplifier amplifying a voltage from a voltage source so as to generate the driving voltage; and a DC/DC converter disposed outside the inner space and designed to supply a source voltage to the amplifier.