Tdk Corporation

Hiroaki Takahata

Hisaji Oyake

Yuuichi Kawaguchi

Kenji Yamaga

Yoshimi Sakai

Kenji Yoneyama

Tetsuya Ueno

Masayuki Muroi

The present invention aims to provide an all-solid-state lithium ion secondary battery having a high reliability which does not have a decrease in battery capacity due to absorption of moisture in the air. The all-solid-state lithium ion secondary battery is provided with a battery body having an electrolyte layer between a positive electrode layer and a negative electrode layer, a pair of terminal electrodes respectively connected to the positive electrode layer and the negative electrode layer at both end portions of the battery body, and a moisture-proof layer disposed on surfaces excluding the surfaces to be the terminal electrodes, wherein the moisture-proof layer contains a cured product of a composition containing a polymer compound and metal compound particles.

All-solid-state lithium ion secondary battery having moisture-proof layer containing polymer compound and metal compound particles

A stamper with a sharp uneven pattern for manufacturing high precision information media and a method of manufacturing a stamper. The method includes (1) manufacturing a photoresist master by forming a light absorption layer and a photoresist layer on substrate, (2) forming a latent image on the photoresist layer, and an uneven pattern in the photoresist layer by developing the latent image, (3) forming a Ni thin film on the uneven pattern by electroless plating, (4) forming a Ni film on the Ni thin film, and (5) removing the Ni thin film and the Ni film from the photoresist master. The method also includes, prior to the step of forming the Ni thin film on the photoresist layer, a metal catalyst being provided on the surface of the uneven pattern, the metal catalyst being activated, and the surface of the uneven pattern being washed with ultra pure water.

Method of manufacturing stamper for manufacturing information medium, stamper, and photoresist master

A stamper for forming a data recording region on a recording medium substrate by means of a transfer surface thereof. The transfer surface transfers a predetermined set of data to the recording medium substrate. The stamper is fitted on at least one of metal molds that are arranged opposite one another for forming the recording medium substrate. The stamper includes a stepped portion formed as bends in the material of the stamper. The stepped portion is configured to project from the transfer surface toward the recording medium substrate.

Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper

Optical recording disc

An optical disk master having a protrusion/depression pattern on its surface is prepared by applying a photoresist layer on a substrate, exposing the photoresist layer to radiation to form a latent image of the protrusion/depression pattern, and developing the latent image. The step of treating the photoresist layer with a surfactant is included prior to the exposing step or between the exposing and developing steps. An optical disk master having a finer pattern can be prepared at a low cost while minimizing any additional burden on the manufacturing system.

Preparation of optical disk master

In an optical recording medium comprising a substrate including parallel extending lands and grooves on one surface thereof, the grooves serving as recording tracks, and the lands being formed with prepits, the height H of the land disposed between the prepit and the groove divided by the height H of the land in a prepit-free region, both as measured from the groove bottom, i.e., H /H ranges from 0.25 to less than 1. This enables to significantly increase the recording density of the medium without a substantial cost increase.

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Tokyo, Japan

Hiroaki Takahata