Aberration correcting optical unit, optical pickup apparatus...

Details Aberration correcting optical unit, optical pickup apparatus... Aberration correcting optical unit, optical pickup apparatus...

2005-06-21

2005-06-21

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C349S156000, C349S187000

Reexamination Certificate

active

06909686

ABSTRACT:
An aberration correcting optical unit includes an optical element for causing a phase change to light passing therethrough by the application of voltage and electrode layers for applying voltages to the optical element. The optical element is sandwiched between the electrode layers. At least one of the electrode layers includes a plurality of electrodes which are electrically isolated from one another. The plurality of electrodes are disposed such that an electric field generated in a portion of the optical element corresponding to a portion between the plurality of electrodes is larger than a predetermined intensity when a predetermined voltage is applied to the optical element.

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