摘要:
A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.
摘要:
A magnetic recording data storage system includes a magnetic recording medium having pits formed therein, the pits defining recording tracks on the magnetic recording medium and being arranged in a staggered manner relative to respective center lines of the recording tracks, a magnetic head including an inductive element for recording data on the recording tracks and a magnetoresistive element for reproducing data from the recording tracks, one of (1) a unit for magnetically producing a signal from the pits, and (2) an optical unit for optically producing a signal from the pits, the optical unit including a laser for illuminating the pits, servo means for positioning the head on the recording tracks based on the signal produced from the pits, the servo means including a dual-stage actuator including a rough movement portion and a fine movement portion.
摘要:
In one type of an angular velocity sensor, a constant vibration is applied in an X direction to one end of a vibrator which is fixed at another end and the vibrator vibrates in a Y direction perpendicular to the X direction by an action of Coriolis force caused by the angular velocity of the vibrator about the Z axis with an amplitude proportional to an angular velocity about a Z axis. An angular velocity sensor of this invention utilizes a photoelectric encoder for measurement of the vibration amplitude of the vibrator in the Y direction. The encoder includes a main scale mounted on the free end of the vibrator; an index scale mounted on a housing of the sensor to face the main scale; and a photoelectric element for sensing light reflected from the main scale and passing through the index scale. The angular velocity sensor utilizing the photoelectric encoder is less subject to influence of variation in the temperature in comparison with the conventional sensor utilizing piezoelectric elements and a higher precision can be attained.
摘要:
A high-density magnetic recording and optical reproducing apparatus for magneto-optically reproducing information magnetically recorded on information tracks on a recording medium, the apparatus comprising two laser beam sources emitting laser beams having different wavelengths respectively, an optical system for directing the laser beams from the two laser beam sources toward and onto the recording medium so as to irradiate the recording medium with laser beam spots partly overlapping each other, two photo detectors detecting the laser beams reflected from the surface of the recording medium, and a differential amplifier detecting the difference between the output signals of the two photo detectors thereby generating the differential signal as a reproduced output.
摘要:
The present invention relates to a displacement detecting apparatus incorporating therein a detector of phase discriminating type electrostatic capacity system. The detector includes a first and second sensing members, which are provided on sections movable relative to each other. The first sensing member is fixed on a support plate provided thereon with an indicator, and the second sensing member is provided on the side of a movable plate, such as a spindle supported by a case body. These sensing members are set at predetermined positions by a position checker allowing the visual inspection therethrough when the support plate is secured to the case body.
摘要:
A power steering system which includes a fluid source that supplies pressure fluid of a constant flow rate, a fluid motor for supplementing manual steering torque, a servo-valve for distributing fluid to the fluid motor, and a reaction device for applying hydraulic reaction or feeling to a starting wheel in accordance with fluid pressure applied thereto. A magnetic control valve having a solenoid therein is connected to the reaction device to vary fluid pressure applied thereto in a predetermined range of pressures in accordance with vehicle operating condition. A mechanism for controlling the fluid pressure applied to reaction device at a predetermined pressure in the predetermined range of pressure even when the current supplied to the solenoid becomes abnormal is incorporated in the magnetic control valve.
摘要:
A power steering, comprising: a pump driven from an engine; a flow control valve for regularizing the discharge rate of the pump varying in response to the rotational speed of the engine; a power cylinder; a distribution control valve for distributing a regularized fluid pressure from the flow control valve to opposite fluid chambers of the power cylinder; a sector gear meshed with a rack formed on the piston of the power cylinder and rotatable by operation of the power cylinder; a sector shaft having the sector gear formed integrally therewith and displaceable in the axial direction for adjusting the preload on the meshed rack and sector gear; a preload control cylinder for axially displacing the sector shaft, the preload control cylinder including a piston connected to the sector shaft and having different pressure receiving areas on the axially opposite ends thereof; a first fluid passage for conducting part of the pressurized fluid being sent from the pump to said flow control valve, to one of fluid chambers defined in the preload control cylinder by the piston; and a second fluid passage for conducting part of the pressurized fluid being fed from the flow control valve to the distribution control valve to the other fluid chamber in the preload control cylinder.
摘要:
A power steering system which includes an engine-driven pump, a fluid motor for supplementing manual steering torque, a fluid control valve for distributing fluid to the fluid motor, and a reaction device for applying hydraulic reaction or feeling to a steering wheel. A first flow control valve is utilized to deliver first fluid flow to a fluid control valve from the pump and to lead excess flow to a bypass passage. A second flow control valve is connected between the bypass passage and the reaction device to deliver second fluid flow to the reaction device and to lead excess flow to a reservoir. A magnetic pressure control valve is connected to the reaction device to control fluid pressure applied thereto in accordance with a predetermined vehicle operating condition, such as vehicle speed.
摘要:
A continuous process for producing rubber-modified methyl methacrylate syrups which comprises continuously supplying a material liquor comprising 1 to 20 parts by weight of a rubbery polymer dissolved in 100 parts by weight of a monomer comprising 60 to 100% by weight of methyl methacrylate, and a radical-polymerization initiator to the first reaction zone, continuously polymerizing at such a stationary conversion that the rubber polymer is dispersed in the form of particles form while maintaining the temperature and residence time in the zone so that a steady state is achieved in the zone and the steady-state concentration of the initiator in the zone is 1/2 to 1/1,000 time as much as the concentration of initiator supplied, continuously taking out the resulting reaction mixture from the zone, and passing it through the second reaction zone having a volume of 0 to 5 times as much as that of the first reaction zone, to obtain a stable syrup comprising a disperse phase and a continuous phase, the former phase being substantially a solution of the rubbery polymer in the monomer and the latter one being substantially a solution of the resinous polymer in the monomer, and a process for the production of methyl methacrylate cast sheets and molding materials having an excellent impact resistance from the syrups.