Abstract: An insulator-coated soft magnetic powder includes a plurality of particles each including a core which contains a soft magnetic material, and an insulating layer which is provided on the surface of the core and contains a glass material including Bi2O3 as a main component. The content of an alkali metal in the insulating layer is 5 mol % or less. The glass material further contains at least one of ZnO and B2O3. The content of Bi2O3 in the glass material is 40 mol % or more and 80 mol % or less.

Abstract: An insulator-coated soft magnetic powder includes a plurality of particles each including a core which contains a soft magnetic material, and an insulating layer which is provided on the surface of the core and contains a glass material including Bi2O3 as a main component. The content of an alkali metal in the insulating layer is 5 mol % or less. The glass material further contains at least one of ZnO and B2O3. The content of Bi2O3 in the glass material is 40 mol % or more and 80 mol % or less.

Abstract: A composite particle includes: a particle composed of a soft magnetic metallic material, and a coating layer composed of a soft magnetic metallic material having a different composition from that of the particle and fusion-bonded to the particle so as to cover the particle, wherein when the Vickers hardness of the particle is represented by HV1 and the Vickers hardness of the coating layer is represented by HV2, HV1 and HV2 satisfy the following relationship: 100?HV1?HV2, and when half of the projected area circle equivalent diameter of the particle is represented by r and the average thickness of the coating layer is represented by t, r and t satisfy the following relationship: 0.05?t/r?1.

Abstract: An amorphous alloy powder is composed of an amorphous alloy material containing Fe, Cr, Mn, Si, B, and C as constituent components, and in the amorphous alloy material, Fe is contained as a main component, the content of Cr is 0.5 at % or more and 3 at % or less, the content of Mn is 0.02 at % or more and 3 at % or less, the content of Si is 10 at % or more and 14 at % or less, the content of B is 8 at % or more and 13 at % or less, and the content of C is 1 at % or more and 3 at % or less. By using such an amorphous alloy powder, a dust core which reduces iron loss and decreases magnetostriction can be obtained.

Abstract: A soft magnetic powder containing an amorphous alloy material having an alloy composition represented by Fe100-a-b-c-dMnaSibBcCd wherein a, b, c and d each represent a proportion in terms of percent by atom, and satisfy 0.1?a?10, 3?b?15, 3?c?15, and 0.1?d?3.

Abstract: An amorphous alloy powder is composed of an amorphous alloy material containing Fe, Cr, Mn, Si, B, and C as constituent components, and in the amorphous alloy material, Fe is contained as a main component, the content of Cr is 0.5 at % or more and 3 at % or less, the content of Mn is 0.02 at % or more and 3 at % or less, the content of Si is 10 at % or more and 14 at % or less, the content of B is 8 at % or more and 13 at % or less, and the content of C is 1 at % or more and 3 at % or less. By using such an amorphous alloy powder, a dust core which reduces iron loss and decreases magnetostriction can be obtained.

Abstract: A composite particle includes: a first particle composed of a soft magnetic metallic material; and second particles composed of a soft magnetic metallic material having a different composition from that of the first particle and adhered to the first particle so as to cover the first particle, wherein when the Vickers hardness of the first particle is represented by HV1 and the Vickers hardness of the second particle is represented by HV2, HV1 and HV2 satisfy the following relationships: 250?HV1?1200, 100?HV2<250, and 100?HV1?HV2, and when the projected area circle equivalent diameter of the first particle is represented by d1 and the projected area circle equivalent diameter of the second particle is represented by d2, d1 and d2 satisfy the following relationships: 30 ?m?d1?100 ?m and 2 ?m?d2?20 ?m.

Abstract: A composite particle includes: a particle composed of a soft magnetic metallic material, and a coating layer composed of a soft magnetic metallic material having a different composition from that of the particle and fusion-bonded to the particle so as to cover the particle, wherein when the Vickers hardness of the particle is represented by HV1 and the Vickers hardness of the coating layer is represented by HV2, HV1 and HV2 satisfy the following relationship: 100?HV1?HV2, and when half of the projected area circle equivalent diameter of the particle is represented by r and the average thickness of the coating layer is represented by t, r and t satisfy the following relationship: 0.05?t/r?1.

Abstract: A soft magnetic powder containing an amorphous alloy material having an alloy composition represented by Fe100-a-b-c-dMnaSibBcCd wherein a, b, c and d each represent a proportion in terms of percent by atom, and satisfy 0.1?a?10, 3?b?15, 3?c?15, and 0.1?d?3.

Abstract: An HDD has a carriage which moves a head with respect to a medium, and a voice coil motor (VCM) which drives the carriage. The VCM has a magnet, between which and a first shell formed of a magnetic substance a magnetic circuit is formed, and a voice coil which is secured to the carriage and disposed in a magnetic gap. A depression which receives a projecting portion covering a lead of the voice coil is formed in the first shell, and thereby a projection projecting toward the coil is consequently formed. This structure partially narrows the magnetic gap and allows generation of a torque with sufficient intensity.

Abstract: In a case having an almost sealed structure are provided a disk-shaped recording medium, a drive motor, a head which performs information processing, a head actuator which moves the head with respect to the recording medium, and a breathing filter. The breathing filter includes an envelope which has air permeability and in which a storing portion is defined, an inner tube arranged in the storing portion and defining a passage through the storing portion, and a collecting material filled in the storing portion and around the inner tube. The inner tube has one end communicating with a breathing hole of the case and the other end having an outlet.

Abstract: A disk drive includes a casing having a mount surface. The casing houses a disk-shaped recording medium, a drive motor which supports and rotates the recording medium, a head which performs information processing for the recording medium, a head actuator configured to movably support the head and move the head relative to the recording medium. A control circuit board is arranged to overlap the mount surface of the casing. A holding seal is adhered to the control circuit board and the casing, covering a peripheral portion of the control circuit board to press the peripheral portion to the mount surface.

Abstract: In a case having an almost sealed structure are provided a disk-shaped recording medium, a drive motor, a head which performs information processing, a head actuator which moves the head with respect to the recording medium, and a breathing filter. The breathing filter includes an envelope which has air permeability and in which a storing portion is defined, an inner tube arranged in the storing portion and defining a passage through the storing portion, and a collecting material filled in the storing portion and around the inner tube. The inner tube has one end communicating with a breathing hole of the case and the other end having an outlet.

Abstract: An HDD has a carriage which moves a head with respect to a medium, and a voice coil motor (VCM) which drives the carriage. The VCM has a magnet, between which and a first shell formed of a magnetic substance a magnetic circuit is formed, and a voice coil which is secured to the carriage and disposed in a magnetic gap. A depression which receives a projecting portion covering a lead of the voice coil is formed in the first shell, and thereby a projection projecting toward the coil is consequently formed. This structure partially narrows the magnetic gap and allows generation of a torque with sufficient intensity.

Abstract: An HDD has a latch mechanism which locks a carriage having a read/write head at a retreated position. The latch mechanism has a latch arm which has a claw to engage with a projection of the carriage. A permanent magnet is embedded in a rear end of the latch arm, and receives a magnetic force from an electromagnet fixed to the housing. An opening is formed in a region of the housing adjacent the permanent magnet, preventing the permanent magnet from being stuck to the housing which is at least partially made of magnetic material.

Abstract: A disk drive includes a casing having a mount surface. The casing houses a disk-shaped recording medium, a drive motor which supports and rotates the recording medium, a head which performs information processing for the recording medium, a head actuator configured to movably support the head and move the head relative to the recording medium. A control circuit board is arranged to overlap the mount surface of the casing. A holding seal is adhered to the control circuit board and the casing, covering a peripheral portion of the control circuit board to press the peripheral portion to the mount surface.

Abstract: A disk drive unit includes a spindle motor, which has a pivot and a substantially cylindrical hub which is rotatably supported on the pivot and constitutes a rotor. A disk is fitted coaxially on the hub, and an annular clamp member holding the disk is fitted on an end portion of the hub. The clamp member has an inner peripheral edge fitted on an outer peripheral surface of the hub, a plurality of engaging portions spaced in the circumferential direction thereof and capable of engaging a removing tool, and a plurality of notch portions which are formed along the inner peripheral edge between the engaging portions and define gaps outside the outer peripheral surface of the hub.