| http://www.w3.org/ns/prov#value | - The lens structures 5a, 5b are formed integrally with the substrate 1 by using a glass or resin processing technique with a high accuracy, that is employed for fabricating an optical element, such as a lens or a diffraction grating, or fabricating a substrate of an optical information recording medium, such as a CD or a DVD. Specifically, the lens structures 5a, 5b can be preferably formed, in cas
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