G - Physics – 01 – D
Patent
G - Physics
01
D
325/1, 354/23, 3
G01D 18/00 (2006.01) G11B 7/125 (2006.01) H01S 5/0683 (2006.01)
Patent
CA 2010788
PHQ 89.003 ABSTRACT METHOD OF DETERMINING THE MONITOR SENSITIVITY OF, AND METHOD AND SYSTEM FOR CONTROLLING A RADIATION EMITTING ARRANGEMENT, AND OPTICAL RECORDING AND/OR REPRODUCING APPARATUS INCLUDING SUCH A SYSTEM 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 (IM) generated by the arrangement to a corresponding optical output level (OL) of the arrangement. The method comprises the steps of: (i) supplying a varying drive signal (IL1,IL2) to the arrangement and measuring the rate of change (.DELTA.IM/.DELTA.IL) of the monitor signal (IM) with respect to the supplied drive signal (IL); and (ii) combining the measured rate of change with an assumed differential efficiency (k) of the arrangement to determine the monitor sensitivity (OL/IM) of the arrangement. The provision of a control system able to implement such a method can eliminate the need for a factory adjustment in the maufacture of apparatus such as optical recording and/or reproducing apparatus. (Figure 3)
Fetherstonhaugh & Co.
Philips Electronics N.v.
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