Optical pickup having two objective lenses

Details Optical pickup having two objective lenses Optical pickup having two objective lenses

1996-11-27

1997-09-30

Huber, P. W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, G11B 700

Patent

active

056732473

ABSTRACT:
An optical pickup for irradiating a first recording medium and a second recording medium with light, at least one of the substrate thickness and the refractive index of the first recording medium being different from that of the second recording medium, where the optical pickup includes: a light source for emitting the light; a polarized beam splitter for receiving the light and for transmitting at least a portion of the light while reflecting the remaining portion of the light depending on the polarization direction of the light; a first objective lens for focusing the portion of the light reflected by the polarized beam splitter onto the first recording medium; and a second objective lens for focusing the portion of the light transmitted through the polarized beam splitter onto the second recording medium.

REFERENCES:
patent: 4550249 (1985-10-01), Damen et al.
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5446721 (1995-08-01), Sekimoto et al.
Y. Sekimoto et al., "Development of Optical Pickup for Mini Disk Drives," Optical Review vol. 1, No. 2 (1994) at 174-76.

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