Abstract: A flexible cable assembly (FCA) has a stiffener layer positioned in electrical contact with an electrical ground feature of the FCA, and a head stack assembly (HSA) may include a suspension tail electrically connected to the stiffener layer of the FCA, thus providing a robust ground path between the read/write head and the arm or E-block of the HSA. Additional efficient grounding techniques may include directly electrically connecting the suspension tail to the arm via a conductive adhesive, directly electrically connecting the FCA stiffener layer to the arm via a conductive screw, and/or directly electrically connecting the ground feature and the stiffener layer of the FCA to the arm using a ground post or screw.

Abstract: An object of the invention is to provide a compact and inexpensive pipe bending processing apparatus.

Abstract: An object of the invention is to provide a compact and inexpensive pipe bending processing apparatus.

Abstract: A head-stack assembly. The head-stack assembly includes: a magnetic-recording head; a lead-suspension supporting the magnetic-recording head on an actuator arm; a metal plate coupled with the actuator arm; a resin layer disposed on the metal plate; a flexible-printed-circuit board disposed on the resin layer, and substantially perpendicularly connected to the lead-suspension; a arm-electronics module disposed on the flexible-printed-circuit board configured to shape a write-signal current waveform of a write signal to said magnetic-recording head; transmission lines disposed on the flexible-printed-circuit board configured to transmit the write signal to, and a read-back signal from, the lead-suspension; and, a single intermediate conductor layer that is disposed between the resin layer and the flexible-printed-circuit board, and having a planar shape substantially facing a bottom of the arm-electronics module and a bottom of the transmission lines.

Abstract: A head-stack assembly. The head-stack assembly includes: a magnetic-recording head; a lead-suspension supporting the magnetic-recording head on an actuator arm; a metal plate coupled with the actuator arm; a resin layer disposed on the metal plate; a flexible-printed-circuit board disposed on the resin layer, and substantially perpendicularly connected to the lead-suspension; a arm-electronics module disposed on the flexible-printed-circuit board configured to shape a write-signal current waveform of a write signal to said magnetic-recording head; transmission lines disposed on the flexible-printed-circuit board configured to transmit the write signal to, and a read-back signal from, the lead-suspension; and, a single intermediate conductor layer that is disposed between the resin layer and the flexible-printed-circuit board, and having a planar shape substantially facing a bottom of the arm-electronics module and a bottom of the transmission lines.

Abstract: A multiple PLL oscillator for oscillating and outputting a plurality of frequencies having a predetermined step frequency, comprising a first and a second reference frequency sources, a switch for selecting the ore of outputs of the first and the second reference frequency sources alternatively and at predetermined time interval, and a PLL frequency synthesizer generating a millimeter wave oscillation output corresponding to each of the first and second reference frequency sources.

Abstract: One of outputs of reference frequency sources 11 and 12 is selected by a switch 13, as a reference frequency signal and compared with the phase of an output of a frequency divider 19 by a phase comparator 14. A voltage controlled oscillator 16 is controlled by a result of comparison. An output of the voltage controlled oscillator 16 and an output of another reference frequency source 18 are mixed by a mixer 17. An upper side band frequency signal of the mixer 17 is used as an output of the multiple PLL oscillator, and a lower side band frequency signal of the mixer 17 is supplied to the frequency divider 19. With the configuration, in the multiple millimeter PLL oscillator, even when the dividing number of frequency increases, lock-up time to reach a desired frequency can be shortened. Thus, stability of a PLL can be improved and specifications of the oscillation frequency of the millimeter wave band and a step frequency of hundreds kHz can be realized.