Patents Assigned to Memory-Tech Holding Inc.
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Patent number: 10068605Abstract: In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (P1max) or a longest space (S1max) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (P2max) or a longest space (S2max) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance.Type: GrantFiled: April 4, 2018Date of Patent: September 4, 2018Assignees: Sharp Kabushiki Kaisha, Memory-Tech Holdings Inc.Inventors: Takayuki Naka, Hirohisa Yamada, Masaki Yamamoto, Hideharu Tajima, Masahito Konishi
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Patent number: 9697863Abstract: An optical disk (100) of the present invention includes (i) a medium information region (101) (a) in which type identification information is recorded by recesses and/or protrusions which are formed by a given modulation method and whose lengths are longer than a length of an optical system resolution limit of a playback device and (b) in which first address information is recorded in a first address data format and (ii) a data region (102) (a) in which content data is recorded by recesses and/or protrusions which are formed by the given modulation method and which include a recess and/or a protrusion whose length is shorter than the length of the optical system resolution limit and (b) in which second address information is recorded in a second address data format.Type: GrantFiled: April 8, 2014Date of Patent: July 4, 2017Assignees: Sharp Kabushiki Kaisha, Memory-Tech Holdings Inc.Inventors: Hirohisa Yamada, Takayuki Naka, Masaki Yamamoto, Yoshihisa Adachi, Hideharu Tajima, Masahito Konishi
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Patent number: 9552838Abstract: In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (P1max) or a longest space (S1max) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (P2max) or a longest space (S2max) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance.Type: GrantFiled: July 1, 2016Date of Patent: January 24, 2017Assignees: Sharp Kabushiki Kaisha, Memory-Tech Holdings, Inc.Inventors: Takayuki Naka, Hirohisa Yamada, Masaki Yamamoto, Hideharu Tajima, Masahito Konishi
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Patent number: 8879371Abstract: A recording medium is provided with: a guide layer on which a guide track or tracks are formed; and a plurality of recording layers, wherein a same mark group is formed in a same rotational phase position of each of a plurality of guide tracks which are included in a beam spot of guide laser light, the mark group including a pair of record marks which are shifted by a predetermined distance toward a right side and a left side, respectively, from a track center.Type: GrantFiled: January 22, 2013Date of Patent: November 4, 2014Assignees: Pioneer Corporation, Memory-Tech Holdings Inc.Inventors: Masayoshi Yoshida, Takuya Shiroto, Hideki Kobayashi, Masakazu Ogasawara, Takao Tagiri, Makoto Suzuki
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Patent number: 8792319Abstract: A recording medium is provided with: a guide layer on which a guide track or guide tracks are formed; and recording layers, wherein (i) an information mark group and (ii) a distinctive mark group are formed in the guide layer, the information mark group being formed on each of a plurality of guide tracks, the distinctive mark group distinguishing a center track out of the plurality of guide tracks on each of which the information mark group is formed, the distinctive mark group including a pair of distinctive record marks which are shifted toward a right side and a left side, respectively, from a track center of the center track, a width of each distinctive record mark is twice or more a width of the guide track.Type: GrantFiled: May 29, 2013Date of Patent: July 29, 2014Assignees: Pioneer Corporation, Memory-Tech Holdings Inc., Pioneer Digital Design and Manufacturing CorporationInventors: Takuya Shiroto, Masayoshi Yoshida, Hideki Kobayashi, Masakazu Ogasawara, Takao Tagiri, Makoto Suzuki
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Publication number: 20130322227Abstract: A recording medium is provided with: a guide layer on which a guide track or guide tracks are formed; and recording layers, wherein (i) an information mark group and (ii) a distinctive mark group are formed in the guide layer, the information mark group being formed on each of a plurality of guide tracks, the distinctive mark group distinguishing a center track out of the plurality of guide tracks on each of which the information mark group is formed, the distinctive mark group including a pair of distinctive record marks which are shifted toward a right side and a left side, respectively, from a track center of the center track, a width of each distinctive record mark is twice or more a width of the guide track.Type: ApplicationFiled: May 29, 2013Publication date: December 5, 2013Applicants: Pioneer Corporation, Pioneer Digital Design and Manufacturing Corporation, Memory-Tech Holding Inc.Inventors: Takuya SHIROTO, Masayoshi YOSHIDA, Hideki KOBAYASHI, Masakazu OGASAWARA, Takao TAGIRI, Makoto SUZUKI