Interference of converging spherical waves with application to the design of light-readable information? recording media and systems for reading such media
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United States of America Patent
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app pub date -
Jan 23, 2006
filing date -
May 1, 2000
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Abstract
An improved light-readable information recording medium is provided that comprises an optical data storage structure having lands and pits, in which the depth of the pits is about: .lamda. 2 .times. n .times. m 1 + M T 2 ,wherein .lamda. is the wavelength of light used to read the information recording medium, m is the order of interference selected from a group consisting of odd integers, MT.sub.T is the transverse magnification, and n is the refractive index encountered by the reading light inside the pits. The invention also provides an improved optical reading system with the parameters satisfying the relationship: n .times. .times. d .lamda. 2 .times. m 1 + M T 2 ,wherein .lamda. is the wavelength of light used to read the information recording medium, m is the order of interference selected from a group consisting of odd integers, M.sub.T is the transverse magnification, n is the refractive index encountered by the reading light inside the pits, and d is the depth of the pits.
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