Optical information recording and/or reproducing apparatus in wh

Details Optical information recording and/or reproducing apparatus in wh Optical information recording and/or reproducing apparatus in wh

1997-01-24

1997-12-23

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4438, 369116, G11B 1100, G11B 700

Patent

active

057012806

ABSTRACT:
An optical information recording and/or reproducing apparatus includes a first light source for recording or erasing information, a first current source for modulating a light beam from the first light source in accordance with a recording signal, a second light source for verification, and a second current source for supplying a current to the second light source to cause the second light source to emit a reproducing light beam. The light beam from the first light source leads on an information track on an optical recording medium, and the light beam from the second light source follows on the information track. Based on reflected light from the optical recording medium, of the light beam from the second light source, information recorded by the light beam from the first light source is reproduced for verification. The apparatus further has an inductor disposed in a current supply path from the second current source to the second light source, which has an impedance sufficiently larger than an impedance of the second light source at a recording signal frequency, and a high-frequency oscillator for modulating a light output from the second light source, which applies a high-frequency current with a frequency sufficiently higher than the recording signal frequency.

REFERENCES:
patent: 5142513 (1992-08-01), Takehara et al.
patent: 5272667 (1993-12-01), Yamada et al.
patent: 5357493 (1994-10-01), Okazaki et al.
patent: 5365535 (1994-11-01), Yamaguchi et al.

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