Optical pickup system

Details Optical pickup system Optical pickup system

1995-10-25

1997-11-11

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369112, 369 4412, G11B 712

Patent

active

056871520

ABSTRACT:
A tracking error signal and a focus error signal can be obtained with those components of the light (plus and minus first-order light) which have been diffracted by a hologram device whereas the undiffracted zero-order light component is for the sole purpose of producing RF signals. As a result, RF signals can be detected without using a segmented photodetector while insuring that output signals of a constant intensity are produced even if there are changes in the spot diameter and position. In addition, any aberrations that are caused by an half-mirror are corrected by optics that is provided in the optical path connecting the half-mirror and the light-receiving elements of a photodetector and this insures that even if an objective lens moves, detection spots on the individual light-receiving elements will move on the latter without causing any offset errors.

REFERENCES:
patent: 5049732 (1991-09-01), Nagahama et al.
patent: 5128914 (1992-07-01), Kurata et al.
patent: 5446719 (1995-08-01), Yoshida et al.

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