Sharp Kabushiki Kaisha Corporation

Mitsubishi Metal Corporation

Nobuyuki Takamori

Hideharu Tajima

Masaki Yamamoto

Go Mori

Yasuhiro Harada

Toshihiko Sakai

Hirohisa Yamada

Akira Takahashi

Yoshiteru Murakami

Michinobu Mieda

Masanori Shimo

Kenji Ohta

Toshiyuki Tanaka

Tomoyuki Miyake

Toshihiro Tamura

Ikuo Nakano

Shinichi Nakajima

Mitsunobu Yoshida

Kenichi Hijikata

Akira Shibata

Toshiharu Inui

Yoshiyuki Nagahara

Masahito Asai

Nobuyuki Usui

Takyuki Shingyoji

Kazushige Takaishi

An optical data recording medium, in which irradiation of a light beam is used for recording and/or reproducing data includes (i) a substrate having an a rise and/or a recess which are a light-incident surface, (ii) a reflective layer, provided on the light-incident surface of the substrate, for reflecting the light beam, (iii) a light absorption layer for converting, to heat, a light of the light beam to heat on the surface of the reflective layer, (iv) a reproducing layer, provided on the surface of the heat-light converting layer, having a transmittance that changes in accordance with a light intensity distribution of the light beam. The optical data recording medium is excellent in super-resolution property, and enables reproduction of a shorter mark length.

Optical data recording medium and method for reproducing recorded data

An optical recording medium includes: a medium information region on which medium identification information is recorded; a content region on which content information is recorded; and a blank region provided between the medium information region and the content region and in which at least two tracks are provided so as to connect a train of prepits in the medium information region and a train of prepits in the content region. No information is recorded on the blank region. Thus, an optical recording medium is provided in which a region on which medium identification information is recorded and a region on which content information is recorded are different in track pitch and in which a reproduction error hardly occurs when reproduction shifts from the region on which the medium identification information is recorded to the region on which the content information is recorded.

Optical recording medium on which information is recorded using train of prepits, and method for reproducing optical recording medium

A super-resolution optical recording medium includes: a medium information region on which medium identification information is recorded; a content region on which content information is recorded; and a blank region provided between the medium information region and the content region and in which at least two tracks are provided so as to connect a train of prepits in the medium information region and a train of prepits in the content region. No information is recorded on the blank region. Thus a super-resolution optical recording medium is provided in which a region on which medium identification information is recorded and a region on which content information is recorded are different in track pitch and in which a reproduction error hardly occurs when reproduction shifts from the region on which the medium identification information is recorded to the region on which the content information is recorded.

Super-resolution optical recording medium on which information is recorded using train of prepits, optical recording medium reproduction device, and control method

A super-resolution optical recording medium includes: a medium information region on which medium identification information is recorded; a content region on which content information is recorded; and a blank region provided between the medium information region and the content region and in which at least two tracks are provided so as to connect a train of prepits in the medium information region and a train of prepits in the content region. No information is recorded on the blank region. Thus, a super-resolution optical recording medium is provided in which a region on which medium identification information is recorded and a region on which content information is recorded are different in track pitch and in which a reproduction error hardly occurs when reproduction shifts from the region on which the medium identification information is recorded to the region on which the content information is recorded.

A super-resolution medium () has a medium identification information for specifying a type of medium recorded in a medium information area () by use of pre-pits having a length not shorter than a length of a resolution limit of an optical system in a reproducing device ().

Optical information recording medium, reproducing device for optical information recording medium, control method and control program for the reproducing device, and medium with the control program recorded therein

In an optical information recording medium (), a light-transmitting layer () or a transparent substrate, an information recording layer (), and a substrate () are stacked in this order from a side from which reproducing light () enters. The information recording layer () includes at least a reproducing film () whose complex refractive index at a light source wavelength (&#x3bb;) of the reproducing light () is changed by heat. The relationship of 0.67&#xd7;(&#x3bb;/NA)&#x3e;TP&#x3e;0.04&#xd7;(&#x3bb;/NA) is satisfied, where TP is a track pitch of prepits () formed on the substrate (), and NA is a numerical aperture of an objective lens () for converging the reproducing light () on the optical information recording medium.

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

A super-resolution optical recording medium () of the present invention includes: a medium information region () on which medium identification information is recorded; a content region () on which content information is recorded; and a blank region () provided between the medium information region () and the content region () and in which at least two tracks are provided so as to connect a train of prepits in the medium information region () and a train of prepits in the content region (). No information is recorded on the blank region (). With this arrangement, the present invention provides a super-resolution optical recording medium in which a region on which medium identification information is recorded and a region on which content information is recorded are different in track pitch and in which a reproduction error hardly occurs when reproduction shifts from the region on which the medium identification information is recorded to the region on which the content information is recorded.

A super resolution medium () is provided with an information signal region () where a content, such as a video or audio content, is recorded and a test read region () where reproduction setting value adjustment information is recorded for adjusting a setting value for reproduction. A shortest mark length on a first prepit row formed in the information signal region () is shorter than a length of an optical system resolution limit of a playback apparatus. The types of mark lengths, recorded in the test read region (), on the second prepit row for adjusting the setting value are the same as part or all types of mark lengths on the first prepit row. Further, the second prepit row includes a prepit having a mark length shorter than the length of the optical system resolution limit of the payback apparatus. Still further, each of the first and second prepit rows has at least three types of mark lengths. With this arrangement, optimum reproduction can be performed for each medium in the super resolution medium ().

Optical information storage medium, optical information storage medium playback apparatus, method of controlling optical information storage medium playback apparatus, control program of optical information storage medium playback apparatus, and storage medium storing the program therein

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Kitakatsuragi-gun, Japan

Nobuyuki Takamori