公开(公告)号：EP2325841A4

公开(公告)日：2014-08-27

申请号：EP09812923

申请日：2009-09-14

Applicant: PANASONIC CORP

Inventor： SANO KOUSEI ,  KOMMA YOSHIAKI ,  HINO YASUMORI

IPC: G11B7/26 ,  G11B7/005 ,  G11B7/24

CPC classification number: G11B7/268 ,  G11B7/00375 ,  G11B2007/0013

Abstract: An optical information medium measurement method of the present invention, for measuring a degree of modulation in an optical information medium of a multilayered structure having a plurality of information layers, includes a first step of measuring the modulation degree of each layer of the optical information medium, by use of a measurement optical system, a second step of obtaining a thickness between layers of the optical information medium, a third step of obtaining a reflectance of each layer of the optical information medium, and a fourth step of converting the modulation degree of each layer, the modulation degree being measured in the first step, into a modulation degree at a reference optical system differing from the measurement optical system, based on a value indicative of the thickness between layers, the thickness being obtained in the second step, and a value indicative of the reflectance of each layer, the reflectance being obtained in the third step.

公开(公告)号：EP2405429A4

公开(公告)日：2014-01-01

申请号：EP10748482

申请日：2010-03-01

Applicant: PANASONIC CORP

Inventor： NAKAMURA ATSUSHI ,  MIYAGAWA NAOYASU ,  ITO KIYOTAKA ,  SHIJI MAMORU ,  HINO YASUMORI

IPC: G11B7/007 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/26 ,  G11B20/10 ,  G11B20/12

CPC classification number: G11B7/00736 ,  G11B7/00454 ,  G11B7/00456 ,  G11B7/261 ,  G11B7/263 ,  G11B20/10009 ,  G11B20/10453 ,  G11B20/1217 ,  G11B2007/0006 ,  G11B2020/1279 ,  G11B2020/1298 ,  G11B2220/2541

Abstract: An optical information storage medium according to the present invention has at least one information storage layer. The optical information storage medium has a management area that stores at least one unit containing control information about the optical information storage medium. The control information includes a format number, which provides information about at least a write strategy type and a write pre-compensation type, and a write strategy parameter, which provides information about the magnitude of shift in an edge position, or variation in the pulse width, of a write pulse train to form a recording mark. And the value of the format number changes according to a combination of the write strategy type and the write pre-compensation type.

公开(公告)号：EP2450890A4

公开(公告)日：2015-07-08

申请号：EP10794272

申请日：2010-07-01

Applicant: SONY CORP ,  PANASONIC CORP ,  TDK CORP ,  HITACHI CONSUMER ELECTRONICS ,  SAMSUNG ELECTRONICS CO LTD

Inventor： AKIMOTO YOSHIHIRO ,  KOBAYASHI SHOEI ,  ITO MOTOSHI ,  HINO YASUMORI ,  INOUE HIROYASU ,  MIYAMOTO HARUKAZU ,  NISHIMURA KOICHIRO ,  HWANG SUNG-HEE ,  HWANG IN-OH

IPC: G11B7/007 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/1267 ,  G11B7/24038

CPC classification number: G11B7/00736 ,  G11B7/1267 ,  G11B7/24038

Abstract: The present invention is to realize a proper inner zone layout in a quadruple-layer disk. A test area is provided in the inner zone (inner circumference side area) in each of recording layers. If two test areas closer to the outer circumference, of four test areas, are defined as a first pair and two test areas closer to the inner circumference are defined as a second pair, the test areas of the first pair and the test areas of the second pair are so disposed as to be prevented from overlapping with each other in the layer direction. Two test areas of the first pair have the same consumption direction of the test area, and are so disposed that the areas to be used next hardly overlap with each other in the layer direction. Two test areas of the second pair have the same consumption direction of the test area opposite to the consumption direction of the test area in the first pair, and are so disposed that the areas to be used next hardly overlap with each other in the layer direction.

公开(公告)号：EP2395510A4

公开(公告)日：2015-06-17

申请号：EP10723903

申请日：2010-02-01

Applicant: PANASONIC CORP ,  SONY CORP

Inventor： MIYASHITA HARUMITSU ,  HINO YASUMORI ,  SHIRAISHI JUNYA ,  KOBAYASHI SHOEI

IPC: G11B20/10 ,  G11B20/18

CPC classification number: G11B20/10009 ,  G11B20/1012 ,  G11B20/10481 ,  G11B20/1816 ,  G11B2220/2537

公开(公告)号：EP2472515A4

公开(公告)日：2015-01-21

申请号：EP10790509

申请日：2010-04-14

Applicant: PANASONIC CORP

Inventor： KOMMA YOSHIAKI ,  ANZAI JOJI ,  TSUKUDA MASAHIKO ,  HINO YASUMORI

IPC: G11B7/24038 ,  G11B7/24067 ,  G11B7/0037 ,  G11B7/085 ,  G11B7/26

CPC classification number: G11B7/24038 ,  G11B7/0037 ,  G11B7/08511 ,  G11B7/26 ,  G11B2007/0013 ,  Y10T29/49

Abstract: An object of the invention is to improve the quality of a servo signal and a reproduction signal. Shape-wise thicknesses tr1, tr2, ..., and trN of a cover layer and first through (N-1)-th intermediate layers of an optical recording medium having refractive indexes nr1, nr2, ..., and nrN are converted into thicknesses t1, t2, ..., 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, ..., 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‰¦ j

公开(公告)号：EP1684281A4

公开(公告)日：2009-03-11

申请号：EP04799416

申请日：2004-11-01

Applicant: PANASONIC CORP

Inventor： NISHIKIORI KEIJI ,  OHNO EIJI ,  HINO YASUMORI

IPC: G11B7/004 ,  G11B7/007 ,  G11B7/2403 ,  G11B7/24094 ,  G11B7/256

CPC classification number: G11B7/2403 ,  G11B7/00736 ,  G11B7/24094 ,  G11B7/256

Abstract: When the recording density of an optical information recording medium is increased, the disk structure becomes more complex; and when many recording layers are provided, the production margin and the production cost becomes problems. By using a substrate and a light-transmitting layer formed on the substrate and made of a material the light transmittance of which varies when irradiated with recording light, information can be recorded/reproduced, thereby realizing easy production of a high-density optical information recording medium at low cost.

公开(公告)号：EP2833360A4

公开(公告)日：2015-03-04

申请号：EP13769315

申请日：2013-03-28

Applicant: PANASONIC CORP

Inventor： NAKATA KOHEI ,  HINO YASUMORI ,  TAKAGI YUJI ,  NAKASENDO TSUYOSHI

IPC: G11B20/18 ,  G11B20/14 ,  H03M13/41 ,  H04L1/00

CPC classification number: G11B20/10 ,  G11B7/005 ,  G11B20/10277 ,  H03M13/1105 ,  H03M13/1515 ,  H03M13/41 ,  H03M13/6331 ,  H04L1/004

Abstract: A decoding device includes: an interference canceling circuit (104) which extracts, from states of 2 K -number (where K is a natural number) of detected signals that are likely within a range of K bit width where an interference between bits of the digital information occurs due to predetermined frequency characteristics, most likely 2 M -number (where M is a natural number) of detected signals respectively corresponding to states of 2 M -number of detected signals which exist within a range of M bit width that is included in the range of K bit width; and a Viterbi decoding circuit (105) which generates a decoded signal by calculating differences between the 2 M -number of detected signals extracted by the interference canceling circuit (104) and expectation signals respectively corresponding to the 2 M -number of detected signals and also by selecting a transition sequence of a state of a detected signal for which the calculated difference is smallest.

公开(公告)号：EP2482279A4

公开(公告)日：2013-12-25

申请号：EP10818538

申请日：2010-09-16

Applicant: PANASONIC CORP ,  SONY CORP ,  TDK CORP ,  HITACHI CONSUMER ELECTRONICS

Inventor： HINO YASUMORI ,  SHIRAISHI JUNYA ,  INOUE HIROYASU ,  WATANABE KOICHI

IPC: G11B7/0045 ,  G11B7/006 ,  G11B7/007 ,  G11B7/125

CPC classification number: G11B7/00736 ,  G11B7/00456 ,  G11B7/0062

Abstract: The present invention provides a recording medium and a recording/reproducing apparatus which enable the number of data units of recording pulse information to be reduced by dividing the recording pulse information into 1 byte-parameter information and differences from a value thereof, and the recording pulse information to be recorded on an existing DI area. A recording medium (801) has an information area (101) in which is recorded, as recording/reproducing control information, set values of a recording pulse adopted when forming a recording mark including: preceding space-based set values that include a first reference value that is a set value of a recording pulse corresponding to a predetermined preceding space and a first difference set value which is a set value of a recording pulse corresponding to a space other than the predetermined preceding space and which is expressed as a difference from the first reference value; and trailing space-based set values that include a second reference value that is a set value of a recording pulse corresponding to a predetermined trailing space and a second difference set value which is a set value of a recording pulse corresponding to a space other than the predetermined trailing space and which is expressed as a difference from the second reference value.

公开(公告)号：EP2367172A4

公开(公告)日：2012-05-23

申请号：EP09825900

申请日：2009-11-11

Applicant: PANASONIC CORP

Inventor： KOMMA YOSHIAKI ,  ANZAI JOJI ,  TSUKUDA MASAHIKO ,  HINO YASUMORI

IPC: G11B7/24 ,  G11B7/085 ,  G11B7/135

CPC classification number: G11B7/24038 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13925 ,  G11B2007/0013

Abstract: An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr1, tr2, tr3, and tr4 of a cover layer (42), a first intermediate layer (43), a second intermediate layer (44), and a third intermediate layer (45) are respectively converted into thicknesses t1, t2, t3, and t4 of the respective corresponding layers each having a predetermined refractive index "no", a defocus amount with respect to a layer having a refractive index nr± and a thickness tr± (satisfying: 1‰¦±‰¦n (where ± is a positive integer and n is an integer of 4 or more)), and a defocus amount with respect to a layer having the refractive index "no" and a thickness t ± (satisfying: 1 ‰¦5±‰¦n (where ± is a positive integer and n is an integer of 4 or more)) are equal to each other; and the thicknesses t1, t2, t3, and t4 satisfy |t1-(t2+t3+t4)|‰§1 µm, a difference between any two values of the thicknesses t1, t2, t3, and t4 is set to 1 µm or more in any case, and |(t1+t2)-(t3+t4)|‰§1 µm.

公开(公告)号：EP2309510A4

公开(公告)日：2011-08-03

申请号：EP09773166

申请日：2009-06-30

Applicant: PANASONIC CORP ,  SONY CORP

Inventor： MIYASHITA HARUMITSU ,  HINO YASUMORI ,  SHIRAISHI JUNYA ,  KOBAYASHI SHOEI

IPC: G11B20/10 ,  G11B20/14 ,  G11B20/18

CPC classification number: G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/1012 ,  G11B20/10212 ,  G11B20/10277 ,  G11B20/10296 ,  G11B20/10361 ,  G11B20/1037 ,  G11B20/10398 ,  G11B20/10425 ,  G11B20/10472 ,  G11B20/10481 ,  G11B20/1816 ,  G11B20/182 ,  G11B20/22 ,  G11B2220/2541