| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium for obtaining high signal amplitude during reproduction regarding a BCA signal stored in the optical information recording medium and its manufacturing method. <P>SOLUTION: The optical recording medium has a recording layer and a reflection layer on a substrate, and an area equivalent to a burst cutting area. The area has a plurality of bar recorded parts and a plurality of bar unrecorded parts. The optical recording medium is characterized in that a ratio (A/B) of transmissivity (A) of the bar recorded parts and transmissivity (B) of the bar unrecorded parts with respect to a laser beam for reproducing information is 1.5 or more. The manufacturing method of the optical information recording medium is characterized by including a bar recording part forming process which forms a plurality of bar recorded parts by irradiating the area equivalent to the burst cutting area with the laser beam whose wavelength is at least 400 to 2,000 nm and whose recording power is at least 0.1 to 20 W; and whose linear velocity is 0.01 to 5 m/s when forming the bar recorded parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
