Diffraction element, optical pickup and optical disc apparatus

Diffraction element, optical pickup and optical disc apparatus

A diffraction element includes: an injection-molded transparent first member having two optical surfaces; and a second member firmly attached to one of the optical surfaces of the first member and provided with a first diffraction pattern on a surface, wherein the second member is a first ultraviole...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: SATO JIN,YAMADA TAKATOSHI,KAWAKITA SATOSHI,KANNO KYU,AIBA MOTOO
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Beschreibung
Zusammenfassung:A diffraction element includes: an injection-molded transparent first member having two optical surfaces; and a second member firmly attached to one of the optical surfaces of the first member and provided with a first diffraction pattern on a surface, wherein the second member is a first ultraviolet curable resin having a refraction index in a range of +-0.013 with respect to a refraction index of the first member.