Patent ID: 7852537
Filing Date: 2010-12-14
Classification: G03H,G11B,Y10T

Abstract:
1. A card-type holographic recording medium comprising: a first substrate comprising a first face and a peripheral groove formed on the first face, the peripheral groove being formed along the periphery of the first substrate to divide the first face into a center portion and an edge portion; a second substrate comprising: a second face and a peripheral projection that is adhered to the edge portion of the first face of the first substrate; and a holographic recording layer filled between the first face of the first substrate and the second face of the second substrate, wherein a void is formed between the holographic recording layer and the first substrate within the peripheral groove, wherein the first substrate is configured to have a first thickness at the center portion and a second thickness at the edge portion, and wherein the first thickness is set to be larger than the second thickness.