In recording on a second or deeper information recording layer of an optical information record medium having a plurality of recording layers, power of a recording laser beam is appropriately controlled even when quantity of transmitting beam is changed depending on recording states of information recording...http://www.google.com.au/patents/US20020136122?utm_source=gb-gplus-sharePatent US20020136122 - Optical information record medium, method of recording information on optical information record medium, and information recording apparatus
