Sony Corporation

Sony Group Corporation

Dexerials Corporation

Kanako Hashimoto

Akihiro Horii

Makoto Aoki

Minoru Yamaga

Jun Sasaki

Tooru Sato

Yasuyuki Kudo

Hiroshi Mizuno

Akihiro Shibata

Kei Obata

Noriyuki Hirai

Teiichi Miyauchi

Satoko Asaoka

Satoshi Sekino

Saori Hayashi

Ken Hosoya

Taku Ishimori

Kazuki Hirata

Takeshi Kondou

Hirofumi Tsuiki

Naoto Sugawara

It is an object to provide a magnetic recording medium that enables good reproduction even after long-term preservation and that has a small overall thickness. The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, a ground layer, a base layer, and a back layer, in which an average thickness tT of the magnetic recording medium is equal to or less than 5.3 &#x3bc;m, and, when the magnetic recording medium is subjected to dynamic viscoelasticity measurement at a frequency of 10 Hz and a temperature rise rate of 2&#xb0; C./min, a difference between a maximum and a minimum of a viscosity term E&#x2033; in a temperature range of 0&#xb0; C. to 80&#xb0; C. is equal to or less than 0.18 GPa. In addition, the present technology also provides a tape cartridge including the tape-shaped magnetic recording medium.

Magnetic recording medium

The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, an underlayer, a base layer, and a back layer. The magnetic recording medium has an average thickness tof 5.4 &#x3bc;m or less, when a thermomechanical analysis is performed on the magnetic recording medium in a temperature range of 40&#xb0; C. to 150&#xb0; C. at a temperature rise rate of 1&#xb0; C./minute, a switching temperature for switching from thermal expansion to thermal contraction is 70&#xb0; C. or more, and a contraction start temperature is 90&#xb0; C. or more at which a length in a longitudinal direction is shorter than the length at 40&#xb0; C., and a Poisson's ratio is 0.40 or less.

Provided is a cyclic olefin resin composition film having a small in-plane retardation and high toughness. The cyclic olefin resin composition film contains a cyclic olefin resin and a styrene elastomer having a storage modulus of lower than 100 MPa at 0&#xb0; C. to 100&#xb0; C. The styrene elastomer is dispersed in the cyclic olefin resin in an amount of 5 to 35 wt %. With this configuration, it is possible to lower the in-plane retardation of the film while ensuring the high toughness of the film.

Cyclic olefin resin composition film

A diffusion sheet includes a light-transmissive base member, a plurality of structures, and a flattened portion. The light-transmissive base member has a first main surface and a second main surface. The plurality of structures have convex shapes, which are randomly formed on the first main surface. The flattened portion is formed among the plurality of structures on the first main surface and has a surface roughness (Ra) equal to or lower than 0.6 &#x3bc;m.

Diffusion sheet, backlight, liquid crystal display apparatus and method of manufacturing the diffusion sheet comprising a plurality of convex shapes that are irregularly spaced and aligned relative to each other

A diffusion sheet includes: a substrate having a first principal surface and a second principal surface; and structures each in a convex shape formed randomly on the first principal surface or the second principal surface of the substrate. The structures have an identical or almost identical height. The structures have an aspect ratio h/r, where r denotes an average radius of the structures and h denotes an average height of the structures, of more than 0.85 and not more than 1.50. The structures have a filling factor of not less than 60% and not more than 80%.

Diffusion sheet and method of manufacturing the same, backlight, and liquid crystal display device

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Miyagi, Japan

Kanako Hashimoto