Information recording/reproducing apparatus that determines the number of recording layers of an information recording medium
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United States of America Patent
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Sep 6, 2005
Grant Date -
Feb 5, 2004
app pub date -
Aug 2, 2002
filing date -
Aug 3, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An information recording/reproducing apparatus of the present invention includes: a light source for emitting a first light beam having a predetermined light power Ppre; a determination section for determining the number of recording layers included in the information recording medium; a light beam transmission adjustment section for adjusting the quantity of the first light beam transmitted therethrough; and a light condensing section for condensing the first light beam on the information recording medium. When the information recording medium has one recording layer, the adjustment section adjusts the predetermined light power Ppre so as to be a first light power P1. When the information recording medium has two recording layers, the adjustment section adjusts the predetermined light power Ppre so as to be a second light power P2. The predetermined light power Ppre, the first light power P1, and the second light power P2 satisfy the relationship of P12≦Ppre.
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