Optical pickup device and optical recording and reproducing...

Details Optical pickup device and optical recording and reproducing... Optical pickup device and optical recording and reproducing...

2005-06-14

2005-06-14

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

06906992

ABSTRACT:
An optical pickup device20comprises an objective lens, a light source1composed of a blue semiconductor laser with a wavelength ranging from 400 to 415 nm and a collimator lens2for collimating light L1from this light source1to provide substantially-collimated light, wherein Abbe number v of a glass material of the collimator lens2satisfies 61<v<90, a linear expansion coefficient α satisfies 55<107×α/K<120, and a refractive index temperature coefficient (dn/dt) satisfies −1.8<106×(dn/dt)/K<+1.5. Since the position at which the focal point of the collimator lens2was displaced due to fluctuation of temperature and fluctuation of wavelength can be compensated for at high accuracy, the optical pickup device can increase recording density and storage capacity of an optical recording medium.

REFERENCES:
patent: 5991102 (1999-11-01), Oono et al.

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