Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-01-06
1992-05-19
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4412, 369 13, 369110, 2502015, 360114, G11B 700
Patent
active
051154234
ABSTRACT:
An optomagnetic information recording and reproducing apparatus includes an optomagnetic optical pick-up for recording or reproducing information on or from an optomagnetic information recording disc. An optomagnetic optical pick-up includes a first diffraction grating for receiving light reflected from the disc and separating the light into a first transmitting light which transmits through the first diffraction grating beam and a first diffracted light beam which is diffracted by the first diffraction grating. A second diffraction grating is disposed to receive the first transmitting and diffracted light beams and discharges a second transmitting light beam and a second diffracted light beam. A tracking error detector is provided to receive the second transmitting light beam and a focusing error detector is disposed to receive the second diffracted light beam. An optomagnetic signal is obtained as a difference between outputs from the tracking and focusing error detectors.
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patent: 4689481 (1987-08-01), Ono
patent: 4824191 (1989-04-01), Kato et al.
patent: 4885734 (1989-12-01), Yuzo
patent: 4894815 (1990-01-01), Yamanaka
patent: 4933924 (1990-06-01), Yonekubo
patent: 4935911 (1990-06-01), Ohuchida et al.
Kitabayashi Junichi
Maeda Hideo
Ohuchida Shigeru
Envall Jr. Roy N.
Ricoh & Company, Ltd.
Tran Thang V.
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