Optical sensor with an elliptical illumination spot

Details Optical sensor with an elliptical illumination spot Optical sensor with an elliptical illumination spot

1996-12-30

1998-02-17

Hindi, Nabil

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369112, G11B 700

Patent

active

057198403

ABSTRACT:
An optical sensor which provides a focused elliptical illumination spot. The instrument includes a light source which provides a light beam that is directed through a cylindrical lens. The cylindrical lens focuses the light beam normally on a disk surface as an elliptical illumination spot with a major axis along a tracking direction and a minor axis along a scanning direction. Light scattered by the disk is then detected by a detector and processed to detect defects on the disk surface.

REFERENCES:
patent: 4935811 (1990-06-01), Tsuchihashi et al.
patent: 5339300 (1994-08-01), Akatsuka et al.
patent: 5568454 (1996-10-01), Shima et al.

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