Abstract: A wireless power transfer system can be achieved at a low cost, can be used as both a power transmission apparatus and a power reception apparatus, and can cope with a change in coupling coefficient of a resonant coil of the power transmission apparatus and a resonant coil of the power reception apparatus. The wireless power transfer system is a power transmission apparatus that is able to perform bidirectional wireless power transmission, and includes the following: a power supply; a switching circuit that includes a plurality of switching devices; a resonator that includes a coil and a capacitor; a drive control circuit that controls an ON/OFF operation of each switching device of the switching circuit; and a detector that detects a resonance current flowing through the switching circuit.

Abstract: A wireless power transfer system can be achieved at a low cost, can be used as both a power transmission apparatus and a power reception apparatus, and can cope with a change in coupling coefficient of a resonant coil of the power transmission apparatus and a resonant coil of the power reception apparatus. The wireless power transfer system is a power transmission apparatus that is able to perform bidirectional wireless power transmission, and includes the following: a power supply; a switching circuit that includes a plurality of switching devices; a resonator that includes a coil and a capacitor; a drive control circuit that controls an ON/OFF operation of each switching device of the switching circuit; and a detector that detects a resonance current flowing through the switching circuit.

Abstract: An easy and low-cost method of manufacturing a thin substrate reduced in surface wobbling by bonding two thin sheets together is provided. A step of bonding thin substrate sheets together is performed by using a device in which a spacer is incorporated into a turntable provided with a through-hole for air inflow. The thin substrate sheets are rotated on the turntable, to spin off and cure an adhesive for bonding.

Abstract: In order to reduce local deflection mainly caused by static electricity generated on a flexible disk which is capable of optical recording and reproducing and is mounted on an attitude control plate, and to perform stable focusing in the optical recording and reproducing, according to the present invention, a spacer is incorporated into the attitude control plate having a penetrating vents for air inflow, the flexible disk capable of the optical recording and reproducing is mounted to rotate integrally to generate a stable air flow in a gap secured between the flexible disk and the attitude control plate so as to equilibrate a force due to the air flow and gravity and a centrifugal force of the flexible disk, and electrostatic repulsion, so that a stably balanced state of the flexible disk is maintained.

Abstract: A magneto-optical recording medium includes a recording layer, a reproducing layer in which information is subjected to expansion reproduction, a first intermediate layer which is provided between the recording layer and the reproducing layer, a recording magnetic field assist layer which is provided on a side opposite to a side of the first intermediate layer with respect to the recording layer, and a second intermediate layer which is provided between the recording layer and the recording magnetic field assist layer. The recording magnetic field assist layer exhibits perpendicular magnetization, which is one of an amorphous alloy film containing GdFeCo as major component and a multilayer film formed by alternately stacking transition metal layers and noble metal layers. The recording magnetic field assist layer generates the assist magnetic field during recording of information to form stable recording magnetic domains even when the external magnetic field is low.

Abstract: A means is provided to determine, accurately in a shorter period of time, an optimum reproducing laser beam intensity for reproducing user data or various management data on a magneto-optical recording medium based on the magnetic amplifying magneto-optical transfer system. In a method for determining the reproducing laser beam intensity of the present invention, a test reproduction area, which is formed of maze magnetic domains having random sizes not subjected to any recording process and provided on a magneto-optical recording medium based on Zero-Field MAMMOS, is irradiated with a laser beam before reproducing user information while changing the laser beam intensity to detect a magneto-optical signal. Subsequently, the reproducing laser beam intensity is determined for user information on the basis of the magneto-optical signal obtained from the test reproduction area.

Abstract: A magneto-optical recording medium wherein a magnetic domain is transferred from a recording layer to a reproducing layer is expanded. When the reproducing layer is formed, the composition ratio of a transition metal at a surface of the reproducing layer on a reproducing light beam-incoming side is made to be higher than the composition ratio of the transition metal at a surface of the reproducing layer on a side opposite to the reproducing light beam-incoming side. Thus, the operation to expand the magnetic domain, transferred from the recording layer to the reproducing layer, is performed smoothly, and the jitter of the reproduced signal is reduced to improve signal-to-noise ratio (S/N) of the reproduced signal.

Abstract: Disclosed are a reproducing method and a reproducing apparatus capable of performing reproduction with a wide power margin, as well as a recording method and a recording apparatus preferably used for super high density recording. A recording and reproducing apparatus 101 principally comprises a magnetic field-applying unit, a laser beam-radiating section, and a signal processing system. A magnetic coil 29, which is provided for the magnetic field-applying unit, is arranged so that its axis of magnetic field generation 102 is oblique to a surface of an information-recording medium 100. A reproducing magnetic field is applied in an oblique direction to the surface of the information-recording medium 100 by using the magnetic coil 29 while radiating a reproducing light beam to the medium by using the laser beam-radiating section. Accordingly, the leak magnetic field in the in-plane direction from a recording magnetic domain in a recording layer is amplified.