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AssigneeAsahi Glass Company, Limited
InventorsKouichi MURATA, Takuji Nomura, Mitsuo Oosawa, Yoshiharu Ooi, Yuzuru Tanabe
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A liquid crystal lens element capable of finely adjusting focal length according to the magnitude of applied voltage, and an optical head device employing such a liquid crystal lens element, are provided. On one surface of a transparent substrate 511, a transparent electrode 513 and a concave-convex portion 517 made of a transparent material having a cross section shape approximated by a saw-tooth shape, are formed so as to constitute a plurality of annular portions, and on one surface of a transparent substrate 512, a transparent electrode 514 is formed. The transparent electrodes 513 and 514 constitute annular divided electrode segments, and division positions of the annular electrode segments are made to be agree with division positions of annular portions of the saw-tooth-shaped concave-convex portion 517 of the transparent substrate 511.
A liquid crystal lens element comprising at least one liquid crystal layer and a first transparent substrate and a second transparent substrate disposed so as to oppose to each other to sandwich the liquid crystal layer, wherein the first transparent substrate includes a transparent electrode and a concave-convex portion made of a transparent material having a cross section of saw-tooth shape or a cross section of saw-tooth shape approximated by steps, and having a rotational symmetry about an optical axis, and the second transparent substrate includes a transparent electrode.
A liquid crystal lens element which is a liquid crystal lens element comprising at least a first substrate and a second substrate disposed so as to be opposed to each other, and a liquid crystal layer sandwiched between the first and the second substrates, and which is configured to change focal point of light transmitted through the liquid crystal layer according to the magnitude of applied voltage to the liquid crystal layer, wherein on one of the surfaces of the first substrate, a first transparent electrode and a concave-convex portion made of a transparent material and having a cross section of saw-tooth shape or a saw-tooth shape approximated by steps, is formed so as to form a plurality of annular shapes concentric around an optical axis of incident light, and on one of the surfaces of the second substrate, a second transparent electrode is formed, and at least one of the first and second transparent electrodes is divided into annular electrode segments, and the dividing position of the transparent electrode into annular electrode segments agree with dividing positions of the saw-tooth-shaped concave-convex portion of the first substrate into annular shapes.
A liquid crystal lens element for changing focal point of light transmitted through the liquid crystal layer according to the magnitude of voltage applied to the liquid crystal layer, which comprises a first Fresnel lens portion, a second Fresnel lens portion and an electrode lens portion;
Dependencies are inferred from the claim text.