METHOD FOR DETERMINING TOLERANCE OF OPTICAL SYSTEM READING HEADS OF DIGITAL DISKS Russian patent published in 2006 - IPC G11B7/00 

FIELD: optical systems for reading information on optical disks; design and analysis of tolerance and technological stability of optical systems reading heads of optical disks.

SUBSTANCE: signal, which is read from optical disk, is simulated by determining laser signal emission, reflected from disk with informational elements of recording layer and diffracted on spatial structure of informational elements of recording layer. Signal, read from optical disk, is determined by calculating the intensity of fully reflected signal and its summation in within the bounds of input pupil of reading head. Change of received output signal is determined in defined time interval, and output signal modulation depth is determined. Also influence on output signal modulation depth coefficient Fk of given k-th defect of reading optical system is determined. Processing for all possible defects is repeated and the whole vector of influence coefficients Fk is obtained. Tolerance values dXk for nominal parameters of optical system using the provided in description formula are determined.

EFFECT: increased performance for tolerance determination and tolerance calculation.

2 cl, 6 dwg