摘要:
This invention relates to a magnetic disk apparatus equipped with magnetic bearings for supporting a spindle without contact by a magnetic attracting or repulsing force. The magnetic disk apparatus prevents occurrence of oscillation of magnetic disks and accomplishes high accuracy positioning.
摘要:
A magnetic head device has a magnetic head slider by means of which information is recorded in and read from a magnetic recording medium. The magnetic head slider is supported by a supporting structure having an internal cavity, an opening formed in a portion of the structure where the magnetic head slider faces the magnetic recording medium and communicating with the internal cavity, and a gas passage through which the gas introduced into the internal cavity through the opening is discharged to the exterior of the internal cavity. With this arrangement, the pressure acting on the back surface of the magnetic head slider is adjusted to keep the slider afloat, while removing dust suspended in the gas around the recording medium and the supporting structure.
摘要:
A flying head slider supporting mechanism comprises a rigid body disposed away from the surface of a magnetic recording medium by a predetermined distance, an air flow passage extending through the rigid body to the surface of the magnetic recording medium, a device for generating an air flow passing through the air flow passage toward the surface of the magnetic recording medium or generating an air flow passing from the surface, a read/write head for reproducing data recording on the magnetic recording medium or recording the same on the magnetic recording medium, a head slider disposed in the air flow and supporting the read/write head, a device for supporting the head slider movable relative to the rigid body in a direction perpendicular to the surface of the magnetic recording medium, and a device for generating a relative movement between the head slider and the magnetic recording medium.
摘要:
An object of the present invention is to provide a carrier which enables to obtain a small RNA in high yield yet in high purity, a simple method for obtaining a small RNA and/or a target nucleic acid of small RNA using the same, and a reagent and a kit comprising the above-described carrier.The present invention relates to (1) a carrier for obtaining a small RNA produced by introducing a polymerizable functional group or a chain transfer group to the surface of a core particle, mixing said particle with a polymerizable monomer, then promoting polymerization reaction to form a layer comprising a polymer compound on the surface of said particle, and immobilizing a physiologically active substance having affinity to a small RNA-binding protein on the surface of the particle; (2) a method for obtaining a small RNA, characterized by using the above-described carrier; (3) a reagent for obtaining a small RNA and/or a target nucleic acid of small RNA, comprising the above-described carrier; (4) a reagent kit for obtaining a small RNA and/or a target nucleic acid of small RNA, comprising said reagent; and (5) a method for obtaining a target nucleic acid of small RNA, characterized by using the above-described carrier.
摘要:
A head arm for use in a magnetic disk drive, comprising a guide arm disposed between a magnetic head and an actuator so as to transmit actuating force of the actuator to the magnetic head thereby guiding the magnetic head along a plane of a magnetic disk, a printed circuit fixed to the guide arm, and deflection compensating member for making the coefficients of thermal expansion of said guide arm and said printed circuit substantially equal to each other in at least the direction of seek of the head arm. No thermal deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the temperature of the environment in which the magnetic disk drive is installed. The head arm may also comprise a guide arm and a printed circuit formed of a moisture absorptive material and covered at all or part of its surfaces with a covering layer formed of a moisture resistive material not permeable to moisture. No deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the humidity of the environment in which the magnetic disk drive is installed. Therefore, the possibility of occurrence of off-track can be minimized.
摘要:
A magnetic head slider for use with a magnetic recording medium has a bearing surface which opposes to the magnetic recording medium and generates a pneumatic bearing effect for floating the magnetic head slider above a surface of the magnetic recording medium. The bearing surface includes a tapered surface portion constituting an air entrance and a flat rail portion connected to the tapered surface portion. The magnetic head slider has vent holes formed in the flat rail portion penetrating through the magnetic head slider from the flat rail portions to an end surface of the slider opposite to the magnetic recording medium.
摘要:
A magnetic disk apparatus includes a plurality of magnetic disks driven to rotate by a spindle motor, arms supporting magnetic heads on the magnetic disks, an actuator for moving the arms on the magnetic disks by a voice coil motor, and a housing which surrounds the magnetic disks, the arms and the actuator. A shroud which arcuately surrounds the magnetic disks along the outer periphery thereof has an opened portion for inserting the arms is formed in a part of the housing. The shroud on an upstream side of the arms relative to airflow generated by the magnetic disks when rotating is provided with an opening having a greater width than that of a gap defined between the shroud and the outer periphery of the magnetic disks. An empty bypass channel is provided which communicates from the opening through a rear side of the voice coil motor to the downstream side of the arms.
摘要:
A head arm for use in a magnetic disk drive, comprising a guide arm disposed between a magnetic head and an actuator so as to transmit actuating force of the actuator to the magnetic head thereby guiding the magnetic head along a plane of a magnetic disk, a printed circuit fixed to the guide arm, and deflection compensating member for making the coefficients of thermal expansion of said guide arm and said printed circuit substantially equal to each other in at least the direction of seek of the head arm. No thermal deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the temperature of the environment in which the magnetic disk drive is installed. A head arm may also comprise a guide arm and a printed circuit formed of a moisture absorptive material and covered at all or part of its surfaces with a covering layer formed of a moisture resistive material not permeable to moisture. No deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the humidity of the environment in which the magnetic disk drive is installed. Therefore, the possibility of occurrence of off-track can be minimized.
摘要:
In a floating type magnetic head support mechanism for a magnetic disk apparatus, a slider carrying a magnetic head floats a small distance above a magnetic disk in accordance with a rotation of the magnetic head to enable a reading/writing of information from/onto the disk by the magnetic head. The slider is coupled to a distal end of a load arm through a gimbal. The coupling portion is located in a common plane parallel with a floating surface of the slider, with the coupling portion including a center of gravity of the slider or being in a parallel plane closer to the floating surface than the center of gravity. The magnetic head support mechanism is so constructed that no rotational moment is applied to a slider during the access operation by the access mechanism.
摘要:
A growth inhibitor for cariogenic bacteria which comprises containing therein dihydroguaiaretic acid as an active ingredient. In particular, the effect of growth inhibition to Streptococcus mutans RIMD 3125001 strain can be obtained at a concentration of 1/50,000.