Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-02-07
2006-02-07
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C369S112060, C369S112110
Reexamination Certificate
active
06995909
ABSTRACT:
Conventional lenses for DVD/CD compatible writing/reading are liable to CD jitter deterioration due to phase shifts in a central area.Setting a corresponding base material thickness of an intermediate area of the circumference A2to greater than 1.2 mm which is the base material thickness of the CD, that is, converging luminous flux that has passed through the intermediate area of the circumference A2onto a farther place than the information recording surface of the base material thickness of the CD makes it possible to reduce jitter deterioration due to phase shifts. Further, it makes possible to provide a system with higher precision and higher reliability.
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Hayashi Hideki
Mizuno Sadao
Lavarias Arnel C.
Nguyen Thong
RatnerPrestia
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