Optical head and optical disc device

Details Optical head and optical disc device Optical head and optical disc device

2011-03-08

2011-03-08

Negrón, Daniell L (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240, C369S044230

Reexamination Certificate

active

07903529

ABSTRACT:
A transmitting/reflecting member for transmitting a laser beam of a first wavelength emitted from a first light source includes a first surface on which the laser beam of the first wavelength emitted from the first light source is incident and a second surface which faces the first surface and from which the laser beam of the first wavelength emerges, an angle α defined between the first and second surfaces satisfies a condition of α≠0, and a third-order astigmatism and a third-order coma aberration occurring when the laser beam of the first wavelength passes through the transmitting/reflecting member are both 5 mλ or smaller. In this way, good recording performance or reproduction performance for various optical discs can be realized by focusing laser beams having different wavelengths on information recording surfaces of optical discs whose protective substrates differ in thicknesses.

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