Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-06-11
1998-08-11
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 54, G11B 7125
Patent
active
057937362
ABSTRACT:
A recording/reproducing apparatus includes a laser for generating laser light to be used for recording/reproducing information onto/from a recording medium, a beam splitter for separating a luminous flux for a monitor, a photodetector for receiving the luminous flux, a power control circuit for keeping an average output of the laser at a predetermined value, a high-frequency adding circuit for applying high-frequency modulation to the laser, and a controller for altering the degree of modulation of the high-frequency modulation. When the average output of the laser is kept constant by the power control circuit, the degree of modulation conducted by the high-frequency adding circuit is altered, the light emitting power (bottom power) subjected to no high-frequency modulation being thus controlled.
REFERENCES:
patent: 5059780 (1991-10-01), Kakuta et al.
patent: 5590111 (1996-12-01), Kirino et al.
"Optical Disk Technique", Onoue et al, published by Radio Technique Company, Jul. 20, 1992, pp. 40-42.
Ishimaru Masahiko
Toda Tsuyoshi
Chu Kim-Kwok
Hitachi , Ltd.
Swann Tod R.
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