Ricoh Company, Ltd.

Tokyo Institute of Technology

Hajime Yuzurihara

Hiroshi Deguchi

Kazunori Ito

Eiko Hibino

Hiroshi Miura

Nobuaki Onagi

Katsuyuki Yamada

Shinya Narumi

Makoto Harigaya

Hiroko Ohkura

Mikiko Abe

Hiroko Tashiro

Yoshiyuki Kageyama

Michiharu Abe

Takashi Shibaguchi

Noriyuki Iwata

Katsuhiko Tani

Michiaki Shinotsuka

Masaru Shinkai

Miku Mizutani

Satoshi Taniguchi

Yasutomo Aman

Katsunari Hanaoka

Kiyoto Shibata

Yuki Nakamura

Masaki Kato

Toshiaki Tokita

Yujiro Kaneko

Ryoji Kanno

Motoharu Tanaka

Akira Shimofuku

Mikiko Takada

Wataru Ohtani

Takeshi Kibe

Shigeo Takeuchi

Hiroyuki Iwasa

Mikio Kinoshita

Hiroko Okura

Hiroyuki Reciente Chigasaki 408 Iwasa

Katsuyuki; Yamada

Hiroshi; Deguchi

Shinya; Narumi

Provided is a sulfide-based solid electrolyte, including: a Na element; a Ge element; a P element; and a S element, wherein an atomic percentage (at. %) of each of the Na element, the Ge element, the P element, and the S element is as follows when a total of the respective elements is 100 at. %,

Solid electrolyte and secondary battery

An optical recording medium having first protective layer, recording layer, second protective layer, and reflective layer, wherein the recording layer contains a phase-change material represented by Formula (1&#x2033;1), Formula (1-2), or Formula (1-3); the second protective layer contains one selected from zinc oxides, indium oxides, tin oxides, mixtures thereof, and materials Formula (2), and materials Formula (3). Formula (1&#x2033;1): InSbX1(X1: Ge, Te, Zn, Mn, or mixture thereof, 0.10&#x2266;&#x3b1;1&#x2266;0.25, 0.65&#x2266;&#x3b2;1&#x2266;0.80, and 0.04&#x2266;&#x3b3;1&#x2266;0.15) Formula (1-2): GaSbSnGeX2(X2: Te, Zn, Mn, In, or mixture thereof, 0.04&#x2266;&#x3b1;2&#x2266;0.09, 0.56&#x2266;62&#x2266;0.79, 0.05&#x2266;&#x3b3;2&#x3c;0.30, 0.03&#x2266;&#x3b4;2&#x2266;0.19, and 0&#x2266;&#x2208;2&#x2266;0.09) Formula (1-3): MnSbSnGeX3(X3: Te, In, Zn, Bi, or mixture thereof, 0.04&#x2266;&#x3b1;3&#x2266;0.09, 0.56&#x2266;63&#x2266;0.79, 0.05&#x2266;&#x3b3;3&#x2266;0.29, 0.03&#x2266;&#x3b4;3&#x2266;0.23, and 0&#x2266;&#x2208;3&#x2266;0.09) Formula (2): ZnO&#x2014;Al&#x2014;Y [(100&#x2212;&#x3b1;4&#x2212;64):&#x3b1;4:&#x3b2;4] (Y: Mn, Ge, Ti, or mixture thereof, 0.5&#x2266;&#x3b1;4&#x2266;10.0, and 0&#x2266;B4&#x2266;25.0) Formula (3): ZnO&#x2014;AlO&#x2014;Z [(100&#x2212;&#x3b1;5&#x2212;65):&#x3b1;5:&#x3b2;5] (Z: Mn oxide, Ge oxide, Ti oxide, or mixture thereof, 0.5&#x2266;&#x3b1;5&#x2266;10.0, and 0&#x2266;65&#x2266;30.0).

Optical recording medium

An optical disc having a transition linear velocity of 8-11 m/s when irradiating continuous light with 11&#xb1;1 mW and a wavelength of 660&#xb1;10 nm using a pickup head with a numerical aperture (NA) of 0.65, and satisfying the following condition:&#x394;|&#x2266;3%where Rb is a reflectance of an unrecorded area, and Ra is a reflectance of the top of an eye pattern after ten cycles of recording. In one recording mode therefor, the disc is rotated at a constant angular velocity so as to have a linear velocity of 3-4 m/s on an innermost track and a linear velocity of 8-9 m/s on an outermost track. In another mode, the disc is rotated at a constant angular velocity so as to have a linear velocity of 5-6 m/s on an innermost track and a linear velocity of 13-14 m/s on an outermost track.

The object is to provide an optical recording method improving the recording characteristics and uniformity in a CAV recording on a phase-change optical recording medium, particularly a high-speed rewritable DVD medium, and a phase-change optical recording medium and an optical recording apparatus used by the method. Regarding a recording method for recording on the phase-change optical recording medium where a recording light comprises a pulse string of heating and cooling pulses, and a light for erasing, an irradiation power is controlled by peak power (Pp), bottom power (Pb) and erase power (Pe), at least any one of Pe/Pp, Pp, Pb and Pe is variable from the minimum to maximum recording linear velocities allowed for the medium, and further the irradiation time of each pulse is varied proportionally with clock T corresponding to a recording linear velocity, the present invention provides an optical recording method which performs a recording by varying at least Pe/Pp from a specific recording linear velocity lower than a peculiar recording linear velocity at which the recording linear velocity degrades abruptly showing a local maximum value, and an optical recording medium and an optical recording apparatus used by the method.

Optical recording method of a phase-change optical recording medium having improved recording characteristics and uniformity and optical recording medium and optical recorder used by the method

An optical information recording medium is provided. This medium at least stores information that indicates a maximum recording linear velocity Vh. The medium comprises a substrate having a concentric circular guide groove. This guide grove has land portions and groves portions. At least a phase change type recording layer is formed on the substrate. The recording layer has such a composition and thickness that a dislocation linear velocity V satisfies the relation V&#x2267;Vh&#xd7;0.85.

Optical information recording medium, method of manufacturing the optical information recording medium, and method of and apparatus for recording/reproducing optical information

An optical recording method of recording information to a phase change optical recording medium with alternate application of peak power and bias power in a pulse manner and with changing a pulse application. interval continuously from an inner part through an outer part of the recording medium with an interval proportional to a window width Tw and a fixed interval, comprising the step of starting a top peak power application interval with a delay from a data input pulse signal starting time for a target mark length nTw, where n denotes an integer in a range between 3 and 14, with changing the delay in proportion to the window width Tw with changing a proportionality factor discretely with respect each linear velocity.

Optical recording method

A phase-change optical information recording medium in which information can be recorded, reproduced and rewritten and which includes a first transparent substrate having a wobbling guide groove which is spirally formed thereon at a pitch; a first dielectric layer located overlying the first transparent substrate and having an optical thickness of from 80 nm to 200 nm; a phase-change recording layer located overlying the first dielectric layer and having an optical thickness of from 20 to 50 nm when the recording layer is in an erased state; a second dielectric layer located overlying the recording layer and having an optical thickness of from 10 nm to 70 nm; a reflection layer located overlying the second dielectric layer; optionally a third dielectric layer located between the second dielectric layer and the reflection layer; and a second transparent substrate located overlying the reflection layer.

Optical information recording medium

An optical recording medium including a recording layer which includes a reversible phase-change recording material, the recording layer being capable of writing information therein, reading written information therefrom, and rewriting written information by utilizing the reversible phase change of the phase-change recording material, wherein when a recording mark formed in the recording layer is repeatedly read 5000 times, using a continuous wave laser beam having such an intensity Pr that satisfies the condition of 1.1&#x2266;R&#x2266;2.0, in which R is &#x3c3;/&#x3c3;as defined in the specification, the optical recording medium satisfies a relationship of d&#x3e;das defined in the specification. The phase-change recording material, a method of producing the optical recording medium, and a method of writing information in the optical recording medium, reading written information therefrom and rewriting written information therein are proposed.

Optical recording medium, recording material, method of producing optical recording medium and optical recording, reading and rewriting method

An optical recording method of recording information to a phase change optical recording medium with alternate application of peak power and bias power in a pulse manner and with changing a pulse application interval continuously from an inner part through an outer part of the recording medium with an interval proportional to a window width Tw and a fixed interval, comprising the step of starting a top peak power application interval with a delay from a data input pulse signal starting time for a target mark length nTw, where n denotes an integer in a range between 3 and 14, with changing the delay in proportion to the window width Tw with changing a proportionality factor discretely with respect each linear velocity.

An information recording method including irradiating an optical information recording medium containing a phase change recording layer on a substrate having a guide groove with continuous light of a laser beam having an erase power level Pe to determine a transition linear velocity Vo defined as a minimum linear velocity above which the following relationship is satisfied: Rr=Ra/Rb&#x3c;1, wherein Rr represents a reflection light intensity ratio, and Ra and Rb represent a reflection light intensity measured after and before the irradiation of the optical information recording medium with the continuous light, respectively, prior to recording information in the optical information recording medium.

Information recording method, information recording device, optical information recording medium, program for recording information and storage medium

In an optical disk substrate film-formation apparatus which prepared an optical disk by forming a thin film on a substrate, the optical disk substrate is held by a holder section. A contact support surface is provided to the holder section which closely contacts at least a portion of the surface of the optical disk substrate rear to the surface where the think film is formed.

Optical device substrate film-formation apparatus, optical disk substrate film-formation method, substrate holder manufacture method, substrate holder, optical disk and a phase-change recording type of optical disk

The present invention provides a recording method for a phase-change optical recording medium. The recording method of the present invention contains the step of irradiating an electromagnetic wave having a multipulse pattern so as to perform recording on a phase-change optical recording medium containing a phase-change recording layer. This method is characterised in that a starting time of a front pulse of the multipulse pattern delays 0.5T to 1.25T from a starting point of the first reference clock relative to the recording mark, where T is a reference clock of the multipulse pattern.

Recording method for a phase-change optical recording medium

An information recording method including irradiating a phase change recording layer of an optical recording medium with either a multi-pulse laser light train having a recording power of Pw or laser light having an erasing power Pe to record a mark having a length nT in the recording layer, wherein n is an integer of from 3 to 14 and T represents a clock cycle, wherein the multi-pulse laser light train has a constitution such that a heating pulse and a cooling pulse are alternated and the number of heating pulses and the number of cooling pulses each increases by 1 when n increases by 2, and wherein when n is from 6 to 14, the last heating pulse and last cooling pulse have a pulse width of from 0.5T to 0.9T and from 0.7T to 1.5T, respectively.

Information recording method and optical recording medium therefor

An optical disc having a transition linear velocity of 8-11 m/s when irradiating continuous light with 11&#xb1;1 mW and a wavelength of 660&#xb1;10 nm using a pickup head with a numerical aperture (NA) of 0.65, and satisfying the following condition:&#x394;R=|Rb&#x2014;Ra|&#x2266;3%where Rb is a reflectance of an unrecorded area, and Ra is a reflectance of the top of an eye pattern after ten cycles of recording. In one recording mode therefor, the disc is rotated at a constant angular velocity so as to have a linear velocity of 3&#x2013;4 m/s on an innermost track and a linear velocity of 8&#x2013;9 m/s on an outermost track. In another mode, the disc is rotated at a constant angular velocity so as to have a linear velocity of 5&#x2013;6 m/s on an innermost track and a linear velocity of 13&#x2013;14 m/s on an outermost track.

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Kanagawa, Japan

Hajime Yuzurihara