G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/26 (2006.01)
Patent
CA 2725734
An object of the invention is to improve the quality of a servo signal and a reproduction signal. Shape-wise thicknesses tr1, tr2, .multidot., and trN of a cover layer and first through (N-1)-th intermediate layers of an optical recording medium having refractive indexes nr1, nr2, .multidot., and nrN are converted into thicknesses t1, t2, .multidot., and tN of the respective layers having a predetermined refractive index "no" which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr1, tr2, .multidot., and trN, a difference DFF between the sum of a thickness "ti" through a thickness "tj", and the sum of a thickness "tk' through a thickness "tm" is set to 1 µm or more (where i, j, k, and m are each any positive integer satisfying i.ltorsim.j < k.ltorsim.m.ltorsim.N), and the thicknesses t1, t2, .multidot., and tN are calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr1, tr2, .multidot., and trN: f(n)=-1.088n3+6.1027n2-12.042n+9.1007 ...(1) in the formula (1), n=r1, nr2, .multidot., and nrN.
Anzai Joji
Hino Yasumori
Komma Yoshiaki
Tsukuda Masahiko
Panasonic Corporation
Riches Mckenzie & Herbert Llp
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