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Shape-wise thicknesses of a cover layer and first through (N−1)th intermediate layers of an optical recording medium having refractive indexes nr1, nr2 are converted into thicknesses t1, t2 of the respective layers having a predetermined refractive index which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr1, tr2, 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≦j≦k≦m≦N), and the thicknesses t1, t2 are calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr1, tr2: f(n)=−1.088n3+6.1027n2−12.042n+9.1007 (1) in the formula (1), n=nr1, nr2, . . . , and nrN.

Titel:	Manufacturing method for optical recording medium, optical recording medium, optical information device, and information reproducing method
Autor/in / Beteiligte Person:	Komma, Yoshiaki ; Anzai, Joji ; Tsukuda, Masahiko ; Hino, Yasumori
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2012
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 8,189,452 Publication Date: May 29, 2012 Appl. No: 13/001192 Application Filed: April 14, 2010 Assignees: Panasonic Corporation (Osaka, JP) Claim: 1. An optical recording medium having a plurality of information recording surfaces, the optical recording medium comprising: a cover layer having a refractive index nr 1 , and formed between a surface of the optical recording medium where light is incident and a first information recording surface closest to a medium surface; a first intermediate layer having a refractive index nr 2 , and formed between the first information recording surface and a second information recording surface second closest to the medium surface; and a second intermediate layer having a refractive index nr 3 , and formed between the second information recording surface and a third information recording surface third closest to the medium surface, wherein an actual thickness tr 1 of the cover layer is in such a range that a spherical aberration lies in a predetermined range, the range is determined based on a product of a thickness of the cover layer having a predetermined refractive index “no”, and a function g(n) expressed by the following formula (1), the thicknesses tr 1 , tr 2 , and tr 3 of the cover layer, the first intermediate layer, and the second intermediate layer are respectively converted into thicknesses t 1 , t 2 , and t 3 having a predetermined refractive index “no”, referring to a defocus value, the thicknesses t 1 , t 2 , and t 3 are calculated by products of a function f(n) expressed by the following formula (2), and the thicknesses tr 1 , tr 2 , and tr 3 , and the thicknesses t 1 , t 2 , and t 3 satisfy the following formula (3): g (n)=−1.1111 n 3 +5.8143 n 2 −9.8808 n+ 6.476 (1) f (n)=−1.088 n 3 +6.1027 n 2 −12.042 n+ 9.1007 (2) \| t 1−(t 2+ t 3)\|≧1 μm (3) in the formulas (1) and (2), n is the refractive index of each layer. Claim: 2. An optical information device for reproducing or recording information with respect to the optical recording medium of claim 1 , wherein the optical information device moves a light spot of laser light to be irradiated onto the optical recording medium from a predetermined information recording surface to another information recording surface of the plurality of the information recording surfaces to thereby reproduce or record information with respect to the plurality of the information recording surfaces. Claim: 3. An information reproducing method for reproducing information from the optical recording medium of claim 1 , the information reproducing method comprising: converging a light spot of laser light onto a predetermined information recording surface of the plurality of information recording surfaces; reproducing information from the predetermined information recording surface; and moving the light spot of laser light from the predetermined information recording surface to another information recording surface of the optical recording medium different from the predetermined information recording surface to thereby reproduce information from the another information recording surface, in the case where the information is reproduced from the another information recording surface. Current U.S. Class: 369/283 Patent References Cited: 6954417 October 2005 Komma et al. ; 2002/0027842 March 2002 Komma et al. ; 2002/0176971 November 2002 Ohsawa et al. ; 2004/0265532 December 2004 Sasa et al. ; 2005/0079390 April 2005 Habuta et al. ; 2005/0157614 July 2005 Ichimura et al. ; 2006/0062133 March 2006 Tsukagoshi et al. ; 2008/0109837 May 2008 Anzai et al. ; 2009/0303864 December 2009 Nagata et al. ; 2010/0118685 May 2010 Komma et al. ; 2011/0051585 March 2011 Komma et al. ; 2011/0076436 March 2011 Inoue et al. ; 2011/0170394 July 2011 Komma et al. ; 2001-155380 June 2001 ; 2004-213885 July 2004 ; 2004-259439 September 2004 ; 2004-288371 October 2004 ; 2006-73053 March 2006 ; 2008-117513 May 2008 ; 2008-226460 September 2008 ; 2008/015974 February 2008 Other References: U.S. Office Action issued Aug. 5, 2011 in U.S. Appl. No. 12/760,828. cited by other ; International Search Report issued May 25, 2010 in International (PCT) Application No. PCT/JP2010/002710. cited by other Assistant Examiner: Yodichkas, Aneeta Primary Examiner: Feild, Joseph Attorney, Agent or Firm: Wenderoth Lind & Ponack, L.L.P.

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Manufacturing method for optical recording medium, optical recording medium, optical information device, and information reproducing method