Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Reexamination Certificate
2005-07-26
2005-07-26
Psitos, Aristotelis M (Department: 2653)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
Reexamination Certificate
active
06922376
ABSTRACT:
An optical device is provided which has a light converging unit for converging the light illuminated on a magneto-optical recording layer of an optical recording medium and a magnetic field generating unit provided on the light converging unit towards the optical recording medium. The diameter of the light beam radiated on the magneto-optical recording layer of the optical recording medium is controlled by a light transmitting hole of the magnetic field generating unit. The light beam illuminated on the magneto-optical recording layer of the optical recording medium is not fluctuated in diameter so that it is possible to produce a magnetic field at a low power consumption. In addition, the magnetic field generating unit is not liable to be ruptured. There is also provided a recording and/or reproducing apparatus employing this optical device.
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Isao Ichimura et al.,High—Density Optical Recording Using A Solid Immersion Lens, Applied Optics, vol. 36, No. 19, Jul. 1, 1997, pp. 4339-4348.
Kouchiyama Akira
Nakaoki Ariyoshi
Suzuki Akira
Yamamoto Kenji
Kananen Ronald P.
Psitos Aristotelis M
Sony Corportion
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