Optical recording apparatus

Details Optical recording apparatus Optical recording apparatus

1996-11-22

1998-02-03

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 59, 369 47, 369 50, G11B 700

Patent

active

057152284

ABSTRACT:
In an optical recording apparatus which records data by stabilizing the duration of laser beam emission, a controller produces a clock signal which is synchronous to source data to be recorded, and modulates the data into modulated data. A phase comparator, oscillator and frequency demultiplier produce a signal which is synchronous to the modulated data, has a constant duty-cycle and has a period that is 1/Kb time (Kb is an integer greater than or equal to 2) the data period of the shortest modulated data. Based on the data and signal, laser emission pattern signals are produced. Signal generators produce reference signals in response to control signals from a microcomputer. Switches are controlled by the pattern signals to conduct reference signals selectively. A laser diode is driven by a signal which is the sum of the selected reference signals, and the laser power is controlled accordingly. The constant duty-cycle of the signal prevents the fluctuation of the duration of laser beam emission.

REFERENCES:
patent: 5323374 (1994-06-01), Arai et al.

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