Optical pickup apparatus having wave plates

Details Optical pickup apparatus having wave plates Optical pickup apparatus having wave plates

1996-10-18

1998-04-07

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369118, 369110, G11B 700

Patent

active

057372993

ABSTRACT:
An optical pickup apparatus which can reduce effective size of an optical spot focused on an optical recording medium is provided. The optical pickup apparatus, in which a light beam emitted from a light source is focused on an optical medium for recording a signal on the optical medium and reproducing the signal from the optical medium, includes an objective lens for focusing the light beam on the surface of the optical medium and focusing a beam reflected from the surface of the optical medium, and two or more wave plates each having a different optical axis direction and located on an optical path between the light source and the objective lens. As a result, the spot size and the intensity of a first side lobe can be decreased, and the spot size can be adjusted according to the recording and reproducing modes.

REFERENCES:
patent: 5281797 (1994-01-01), Tatsuno et al.
patent: 5337302 (1994-08-01), Gotch et al.
patent: 5615050 (1997-03-01), Kant

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