Light source for optical head

Details Light source for optical head Light source for optical head

2005-08-23

2005-08-23

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

C369S112280

Reexamination Certificate

active

06934239

ABSTRACT:
A light source unit, which is employed in an optical head for an optical disc drive, is provided with a laser diode having a plurality of light emitting points. The plurality of light emitting points are spaced from each other by a predetermined minute amount. One of a plurality of laser beams having different wavelengths is selectively emitted from the plurality of light emitting points. The light source unit further includes a collimating lens that collimates each of the plurality of laser beams respectively emitted from the plurality of light emitting points. The plurality of laser beams passed through the collimating lens proceeds in different directions. The light source unit further includes a transparent optical path compensation element having a predetermined dispersion characteristic. Each of the plurality of laser beams emerging from the collimating lens is emerged from the transparent optical path compensation element along the same optical path.

REFERENCES:
patent: 5153768 (1992-10-01), Appel
patent: 6088322 (2000-07-01), Broome et al.
patent: 6671247 (2003-12-01), Arai et al.

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