Liquid crystal lens element optical head device

Details Liquid crystal lens element optical head device Liquid crystal lens element optical head device

2007-01-19

2010-06-15

Nguyen, Hoa T (Department: 2627)

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Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07738344

ABSTRACT:
A liquid crystal lens element is provided, which does not produce change of transmission wavefront regardless of polarization state of incident light when it is off-state at a time of no voltage application, and which exhibits concave lens function for extraordinarily polarized incident light when it is on-state at a time of voltage application.In a liquid crystal lens element10comprising a pair of transparent substrates11and12and a liquid crystal layer16sandwiched between the transparent substrates, which is configured to change convergent point of light transmitted through the element according to the magnitude of voltage applied to the liquid crystal layer16,the liquid crystal lens element10further comprises a Fresnel lens17having a concave-convex-shaped cross section formed on the transparent substrate11, a first transparent electrode13formed on a flat surface of the transparent substrate11on which the Fresnel lens17is formed, and a second transparent electrode14formed on a flat surface of the other transparent substrate12.

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