OPTICAL INFORMATION REPRODUCING DEVICE AND REFERENCE BEAM ADJUSTING METHOD
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United States of America Patent
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Issued Date -
Nov 17, 2016
app pub date -
May 11, 2016
filing date -
May 11, 2016
priority date (Note) -
Abandoned
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Abstract
A reference beam adjusting method for reproducing information recorded on an optical information recording medium by utilizing interference of a signal beam with a reference beam includes a step of changing the wavelength of the reference beam; a step of changing the angle of the reference beam to the optical information recording medium; a step of detecting a brightness distribution of the reproduction image from the optical information recording medium; a step of calculating a gravity center dispersion in the brightness distribution of the reproduction image; and a step of controlling the angle and wavelength of the reference beam based on the gravity center dispersion.
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