Nitto-denko Corporation

Nitto Denko Corporartion

Akinori Nishimura

Hiroyuki Takemoto

Takehito Fuchida

Kozo Nakamura

Minoru Miyatake

Shunsuke Shutou

Daisuke Ogomi

Kazuto Yamagata

Kiyoe Shigetomi

Tomohito Takita

Hideyuki Yonezawa

Masashi Shinagawa

Kazunori Futamura

Yasuko Iwakawa

Tetsurou Takeda

Mitsuhiko Tsuji

Kenrou Murate

There is provided an optical communication apparatus having high communication stability. An optical communication apparatus of the present invention includes: a signal-transmitting portion; and a signal-receiving portion. The signal-transmitting portion includes a light-emitting element, and a first polarizing plate, which light output from the light-emitting element enters, and which is configured to output polarized light. The signal-receiving portion includes a second polarizing plate, which the light from the signal-transmitting portion enters, and a light-receiving element configured to receive light passing through the second polarizing plate. The first polarizing plate includes a first reflective polarizer.

Optical communication device and polarization plate set

There is provided a light diffusing element made of a thin film capable of realizing low backscattering and a high haze. A light diffusing element according to an embodiment of the present invention includes: a first region having a first refractive index; and a second region having a second refractive index. The first region and the second region form a fine uneven-shaped and spherical shell-shaped boundary.

Light-diffusing element, polarizer having light-diffusing element, and liquid crystal display device having same

There is provided a light diffusing element of a thin film, which has high light diffusibility and a small depolarization factor. A light diffusing element according to an embodiment of the present invention includes: a first region having a first refractive index; a refractive index modulation region having a substantially spherical shell shape, which surrounds the first region; and a second region having a second refractive index, which is positioned on a side of the refractive index modulation region opposite to the first region. The light diffusing element has a haze of 90% to 99.9% and a depolarization factor of 0.2% or less.

Light-diffusing element and polarizing plate provided therewith

There is provided an extremely thin light diffusing film, which has strong light diffusibility, has suppressed backscattering, and is excellent in productivity. The light diffusing film includes: a first region having a first refractive index; a substantially spherical shell-shaped refractive index modulation region surrounding the first region; and a second region having a second refractive index, the region being positioned on a side of the refractive index modulation region opposite to the first region. The light diffusing film has a light diffusion half-value angle of 30&#xb0; or more and a thickness of 4 &#x3bc;m to 25 &#x3bc;m, and satisfies the following expressions (1) and (2):0.011(30&#x2266;&#x2266;60)&#x2003;&#x2003;(1)0.0275&#x2212;0.99 (60&#x3c;)&#x2003;&#x2003;(2)where x represents the light diffusion half-value angle (&#xb0;) and y represents a backscattering ratio (%), the expressions (1) and (2) each representing a relationship between a numerical value for the light diffusion half-value angle and a numerical value for the backscattering ratio.

Light diffusing film, polarizing plate with light diffusing film, liquid crystal display device, and lighting equipment

There is provided a light diffusing element made of a thin film capable of realizing low back scattering and a high haze. A light diffusing element according to an embodiment of the invention includes: a first region having a first refractive index n; a refractive index modulation region having a substantially spherical shell shape and surrounding the first region; and a second region having a second refractive index n, the second region being positioned on a side of the refractive index modulation region opposite to the first region. The light diffusing element satisfies the following expressions (1) and (2):0.0006&#x2266;&#x394;&#x2003;&#x2003;(1)10&#x2266;(&#x394;)&#x2003;&#x2003;(2).

Light-diffusing element, polarizing plate having light-diffusing element attached thereto, polarizing element, and liquid crystal display device equipped with those components

A method for producing a polarizer of the present invention includes: subjecting a polyvinyl alcohol film to at least a dyeing process, a crosslinking process and a stretching process, then subjecting the film, in which all of the processes have been performed, having a water content of 25 to 55% by weight to a drying process, wherein in the drying process, the water content of the film is reduced by at least 15% by weight, so that the film has a water content of 5 to 35% by weight, and the drying process has a quick drying stage in which the water content of the film is reduced by at least 10% by weight in a time period of &#xbd; to 1/30 of the total drying time of the drying process. The polarizer obtained by the production method has durability and has good optical properties over a wide band.

Method for producing polarizer, polarizer, polarizing plate, optical film, and image display device

A liquid crystal display apparatus according to an embodiment of the invention includes: a liquid crystal cell; polarizing plates placed on both sides of the liquid crystal cell; a light diffusing element provided outside of the polarizing plate on a viewer side; and a backlight unit provided outside of the polarizing plate on an opposite side of the viewer side. The backlight unit includes a collimated light source device that emits collimated light having a brightness half-value angle of 3&#xb0; to 35&#xb0; toward the liquid crystal cell, and a ratio Fw(BL)/Fw(FD) between a diffused light half-value angle Fw(FD) of the light diffusing element and the brightness half-value angle Fw(BL) of the collimated light is 0.5 or less.

Liquid crystal display apparatus

As the polarizing fiber of the present invention, the cross sectional form perpendicular to the longitudinal direction has a sea-island structure, and the cross sectional form is continuously made up in the longitudinal direction. A resin (sea component) that constitutes the sea region of the sea-island structure comprises a dichroic dye, and a resin (island component) that constitutes the island regions of the sea-island structure is a transparent resin. The polarizing fiber of the present invention may be used as a forming material of a polarizer, for example. By using the above polarizing fiber, a polarizer wherein unevenness of the transmittance is small and cracks are less generated may be formed.

Polarizing fiber, polarizer, polarizing plate, laminated optical film, and image display

There is provided a composite polarizing plate used for a liquid crystal display device comprising a liquid crystal cell, a front substrate, and a collimated light source device according to present invention includes a polarizer; and a light diffusion pressure-sensitive adhesion layer placed on a side of the polarizer, wherein when the composite polarizing plate is used for the liquid crystal display device, the light diffusion pressure-sensitive adhesion layer is arranged in contact with the front substrate.

Composite polarizing plate having a light diffusion pressure-sensitive adhesion layer and liquid crystal display device

Disclosed herein is a depolarizing film which is excellent in productivity and can have a large area. The depolarizing film is obtained by using birefringent very short fibers instead of inorganic birefringent crystals, such as calcite, for use in conventional depolarizing elements.

Growing community of inventors

Ibaraki, Japan

Akinori Nishimura