Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-06-07
1992-09-22
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
G11B 700
Patent
active
051503514
ABSTRACT:
A recording apparatus overwrites an input signal having pulse duration periods and pulse spacing periods to an optical disk by irradiation of a laser beam to form recording marks corresponding to the pulse duration periods. The apparatus includes a detector for detecting a leading edge of the pulse duration period and for producing a start signal thereupon, another detector for detecting a trailing edge of the pulse duration period and for producing a stop signal thereupon, a pattern setting circuit for setting a predetermined basic pattern, and a pattern generator for generating the basic pattern from its beginning in response to the start signal and for terminating the generation of the basic pattern in response to the stop signal. The apparatus further includes a circuit for forming a modulated signal using a full or portion of the basic pattern produced from the pattern generator. The laser output is produced in accordance with the modulated signal.
REFERENCES:
patent: 5001692 (1991-03-01), Farla et al.
patent: 5003527 (1991-03-01), Matsumoto et al.
Akahira Nobuo
Ishibashi Kenzou
Kimura Kunio
Nishiuchi Ken'ichi
Ohno Eiji
Envall Jr. Roy N.
Matsushita Electric - Industrial Co., Ltd.
Tran Thai
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