Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1994-12-22
1996-04-23
Epps, Georgia Y.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 369112, G11B 1100
Patent
active
055110487
ABSTRACT:
The second harmonic wave of a solid laser light which is emitted from a second harmonic wave light source is divided into a plurality of laser beams by a diffraction grating. The divided laser beams are converged on a record carrier into a plurality of light spots by an optical head. Magnetic field generating coils for applying magnetic fields to the respective light spots in accordance with the recording signals from a signal line are disposed under the record carrier. Part of the solid laser light is reflected and input to a beam splitter. Since part of the light input to the beam splitter is taken out, a stabilizer controls the output of the solid laser light from the second harmonic wave light source, parallel recording/reproduction using the plurality of light spots which are arranged on the record carrier is enabled and the formation of the plurality of light spots is effectively controlled. Thus, a magneto-optical recording and reproducing apparatus which is capable of high-density recording and high-speed data transfer, which supplies a stable and accurate optical output, and which facilitates the control of the optical output is provided.
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"Characteristics of Optical Second-harmonic Generation due to Cerenkov-radiation-type phase matching" K. Chikuma and S. Umegaki J. Opt. Soc. Am. B/vol. 7, No. 5/May 1990.
Egusa Naoyuki
Irie Mitsuru
Ishimori Akira
Karaki Morihiro
Koike Manabu
Dinh Tan
Epps Georgia Y.
Mitsubishi Denki & Kabushiki Kaisha
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