摘要:
A portable, small magnetic disk drive to be mounted on a portable device operates silently at low power consumption. In one embodiment, a spindle motor is fixed to the bottom wall of a metal base plate formed in the shape of a box by press working. The spindle motor is provided with a fluid dynamic bearing (FDB). A spindle hub is supported on the FDB, and a small magnetic disk having a diameter of about 1.8 in. (45.7 mm) or below is mounted on the spindle hub and is fastened to the spindle hub with a top clamp. The rotating speed of the spindle motor is about 4200 rpm or below. Gram load for pressing a magnetic head toward the magnetic disk is about 0.5 gf or above and less than about 1.0 gf.
摘要:
A stable kinetic performance is to be exhibited even in the case of such a small-sized slider as Femto slider. In one embodiment, an air bearing surface (ABS) of a slider comprises a first pad constituting portion extending from a leading edge side to a trailing edge side, a second pad constituting portion and a third pad constituting portion formed on both sides of the first pad constituting portion and extending from the leading edge side to the trailing edge side, a connecting pad for connecting the first, second, and third pad constituting portions on the leading edge side, a first negative pressure portion formed by the first and second pad constituting portions and the connecting pad, a second negative pressure portion formed by the first and third pad constituting portions and the connecting pad, and an air trap portion formed on the leading edge side of the connecting pad.
摘要:
A bonding structure body in which a semiconductor element and an electrode are bonded via a solder material, wherein a part that allows bonding has a first intermetallic compound layer that has been formed on the electrode side, a second intermetallic compound layer that has been formed on the semiconductor element side, and a third layer that is constituted by a phase containing Sn and a sticks-like intermetallic compound part, which is sandwiched between the two layers of the first intermetallic compound layer and the second intermetallic compound layer, and the sticks-like intermetallic compound part is interlayer-bonded to both of the first intermetallic compound layer and the second intermetallic compound layer.
摘要:
A joint structure joins an electronic element 12 included in an electronic component to an electrode 14 included in that electronic component. The joint structure includes a solder layer, which contains 0.2 to 6% by weight of copper, 0.02 to 0.2% by weight of germanium and 93.8 to 99.78% by weight of bismuth, a nickel layer provided between the solder layer and the electrode, and a barrier layer provided between the nickel layer and the solder layer. Here, the barrier layer is formed so as to have an average thickness of from 0.5 to 4.5 μm after the electronic element and the electrode are joined by the solder layer.
摘要:
The present invention relates to a bonding structure, including: a ceramic member including a hole; a terminal embedded in the ceramic member, an exposed surface exposed to a bottom portion of the hole, and made of a refractory metal having a thermal expansion coefficient substantially equal to a thermal expansion coefficient of the ceramic member; a brazed bond layer including a first tantalum layer in contact with the exposed surface of the terminal, a gold layer formed on the first tantalum layer, and a second tantalum layer formed on the gold layer; and a connecting member inserted in the hole, bonded to the terminal via the brazed bond layer, and made of a refractory metal having a thermal expansion coefficient substantially equal to the thermal expansion coefficient of the ceramic member.
摘要:
Embodiments of the present invention help to effectively remove adhesion on a head slider. In an embodiment of the present invention, a hard disk controller/multiprocessing unit (HDC/MPU) raises the temperature on the surface of a head slider with a heating element on the head slider to remove adhesion on the head slider while an actuator stays on a ramp. The HDC/MPU varies the amount of heat in accordance with the temperature sensed by a temperature sensor. This achieves removal of the adhesion on the head slider, maintaining reliability.
摘要:
In the present invention four thrusters are provided as a group of thrusters for collision avoidance. These thrusters contain a component of translational thrust for collision avoidance injection in their respective outputs, and are capable of simultaneously generating posture control torque around two coordinate axes, which are orthogonal to a thrust axis, in order to maintain the directional stability of the thrust axis during the injection. When abnormality arises in a group of thrusters for ordinary use, collision avoidance is executed by replacing all the thrusters for ordinary use by these thrusters for collision avoidance.
摘要:
A bonded structure 106 includes a semiconductor element 102 bonded to a Cu electrode 103 with a bonding material 104 predominantly composed of Bi, wherein the semiconductor element 102 and the Cu electrode 103 are bonded to each other via a laminated body 209a that progressively increases a Young's modulus from the bonding material 104 to a bonded material (the semiconductor element 102 and the Cu electrode 103), achieving stress relaxation against a thermal stress generated in a temperature cycle during the use of a power semiconductor module.