Optical pick-up device having lens for first-order light...

Details Optical pick-up device having lens for first-order light... Optical pick-up device having lens for first-order light...

2005-07-19

2005-07-19

Psitos, Aristotelis M (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S112100, C369S112250

Reexamination Certificate

active

06920098

ABSTRACT:
Disclosed is a lens for light collection for total reflection for a front monitor photodiode (PD) in an optical pick-up device. The optical pick-up device includes a light source provided with a holographic unit adapted to diffract a light beam, an optical disc arranged in front of the light source and adapted to allow data to be written thereof or to be read therefrom, a monitor photodiode arranged in front of the light source in a diagonal direction with respect to the light source, the monitor photodiode serving to monitor a laser power of the light source, and a lens for light collection arranged between the light source and the monitor photodiode and adapted to converge a first-order diffracted beam outputted from the holographic unit and to apply the converged first-order diffracted beam to the monitor photodiode. The optical pick-up device can achieve an enhancement in the efficiency of utilizing a main beam, namely, a zero-order diffracted beam, an improvement in optical characteristics, and an improvement in the axial distance between the light source and the monitor PD.

REFERENCES:
patent: 5475210 (1995-12-01), Taguchi et al.
patent: 5640380 (1997-06-01), Saimi et al.
patent: 6346695 (2002-02-01), Yanagawa et al.
patent: 6584060 (2003-06-01), Oohchida et al.

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