Patent ID: 6771867
Filing Date: 2004-08-03
Classification: G03H,G11C

Abstract:
An optical memory device comprising:a core layer; a first cladding layer laminated on a first surface of the core layer; and a second cladding layer laminated on a second surface of the core layer opposing the first surface to form a waveguide; an information area formed on at least one interface between the core layer and the cladding layers and having a concave and convex pattern of information, wherein when a reference beam is introduced into the core layer through an end of the waveguide, the information recorded in the concave and convex pattern is reconstructed, said information area has a width of at least 2 mm, and a degree of bending of the core layer at the end of the information area in which the concave and convex pattern for information is formed satisfies the condition represented by the following formula: &Dgr;t&lE;dâˆ’t where &Dgr;t indicates the degree of bending of the core layer at the end of the information area, d indicates the vertical width of the reference beam, and t indicates the thickness of the core layer in the information area.