Nhk Spring Co., Ltd.

Osamu Okawara

Toshiki Ando

Masaru Inoue

Hideki Fuchino

Naoki Moriya

A head suspension has a piezoelectric element that deforms in response to an applied voltage, a base plate provided with an opening to which the piezoelectric element is attached, and a load beam fixed to the base plate so that a front end of the load beam moves in a sway direction according to deformation of the piezoelectric element. The head suspension includes an adhesive applied to a gap between the piezoelectric element and the opening, to attach the piezoelectric element to the opening. The adhesive has a thixotropic characteristic and is sol when applied to the gap.

Head suspension

A processing device is provided with a circuit connected to a first conductive portion and a second conductive portion. An AC voltage source produces an AC waveform voltage obtained by adding a bias voltage to an AC voltage for capacitance measurement. The AC waveform voltage is applied between the first conductive portion and the second conductive portion through the measurement probes. The moment the AC waveform voltage is applied to the circuit with a switch closed, an inrush current flows through the circuit based on a potential difference of the bias voltage. This inrush current causes dielectric breakdown in the conductive resin, thereby securing the continuity of the conductive resin. With the continuity of the conductive resin secured, a capacitance of the piezoelectric body is measured by the AC waveform voltage, and it is determined whether or not the piezoelectric body is normal.

Processing device for piezoelectric actuator and processing method for piezoelectric actuator

A piezoelectric elementhas a common electrodethat receives electricity from a terminal. The terminalhas a through holeand an electric insulating layer. The piezoelectric elementis arranged so that the common electrodefaces the electric insulating layerof the terminal. A liquid stopperis formed around the through holeso as to come between the common electrodeand the terminalwhen the common electrodeand terminalare set to face each other. A liquid conductive adhesiveis injected into the through holeto fill a gap defined by the liquid stopperbetween the terminaland the common electrodeand secure electric connection between the terminaland the common electrode This configuration improves the reliability of wiring to the piezoelectric element and prevents the piezoelectric element from being damaged.

Electrical connecting structure for piezoelectric element, piezoelectric actuator, head suspension, and electrical connecting structure for conductive part

A static posture correcting apparatus has a controller preparing a correction recipe-table, a measuring unit measuring a pitch angle and a roll angle of a head portion of a flexure of a head suspension, a laser irradiating unit irradiating laser beams on irradiation lines of a flexure of an objective head suspension, the controller selecting an effectual correction recipe from the correction recipe-table and controlling the laser irradiating section to irradiate laser beams on the irradiation lines of the flexure of the objective head suspension according to the selected correction recipe, wherein the controller considers variations among reference values of pitch angle and roll angle changes of the sample head suspensions when preparing the correction recipe-table and selects the recipe so as to diminish an expected variation in target static posture angle characteristic due to correction.

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Aikoh-gun, Japan

Osamu Okawara