| http://www.w3.org/ns/prov#value | - The optical system provides a diffraction section on one or more surfaces of the optical system and satisfies a predetermined conditional formula.In addition, in an optical pickup system, a diffraction optical element is used to achieve compatibility in plural wavelengths (for example, of red, blue, and colors other than the red and blue) and to correct aberration by a single objective lens (for e
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