| http://www.w3.org/ns/prov#value | - In the diffraction optical element for achieving compatibility in plural wavelengths (for example, of red, blue, and colors other than the red and blue) and for correcting aberration by a single objective lens, Formula (1) is satisfied for the depth margin.Recently, the beam spot diameter has been smaller than before due to the progress of high density recording and the depth margin is likely to b
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