Optical head having multiple light sources having different wave

Details Optical head having multiple light sources having different wave Optical head having multiple light sources having different wave

1997-09-12

1999-11-09

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, G11B 712

Patent

active

059827327

ABSTRACT:
An optical head includes a fixed optical system having a first light source for outputting a first collimated light having a first wavelength, a first detection system for receiving a reflection of the first collimated light from a first optical disk having a first substrate thickness, a second light source outputting a second collimated light parallel to the first collimated light and having a second wavelength different than that of the first wavelength, and a second detection system for receiving a reflection of the second collimated light from a second optical disk having a second substrate thickness different than that of the first substrate thickness. A movable optical system includes an objective lens for focusing the first light on the first optical disk, and for focusing the second light on the second optical disk and an optical system for converting a wavefront of the second light and transmitting the second light to the objective lens. A driving system moves the movable optical system in a direction relative to the first collimated light.

REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5737300 (1998-04-01), Ota et al.
European Search Report dated Mar. 25, 1998.

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