Method of determining the monitor sensitivity of, and method and

Details Method of determining the monitor sensitivity of, and method and Method of determining the monitor sensitivity of, and method and

1990-02-16

1991-11-19

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

369100, 369122, 369106, G11B 700, G11B 785

Patent

active

050671227

ABSTRACT:
A method is described which enables automatic determination of the monitor sensitivity of a radiation emitting arrangement (in particular a laser diode and photodiode arrangement), which monitor sensitivity relates a level of a monitor signal (I.sub.M) generated by the arrangement to a corresponding optical output level (O.sub.L) of the arrangement. The method comprises the steps of: (i) supplying a varying drive signal (I.sub.L1,I.sub.L2) to the arrangement and measuring the rate of change (.DELTA.I.sub.M /.DELTA.I.sub.L) of the monitor signal (I.sub.M) with respect to the supplied drive signal (I.sub.L); and (ii) combining the measured rate of change with an assumed differential efficiency (k) of the arrangement to determine the monitor sensitivity (O.sub.L /I.sub.M) of the arrangement. The provision of a control system able to implement such a method eliminates the need for a factory adjustment in the manufacture of apparatus such as optical recording and/or reproducing apparatus.

REFERENCES:
patent: 4785443 (1988-11-01), Minami et al.

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