Mitsubishi Rayon Company, Limited

Tomonari Yoshimura

Kenji Yagi

Yoshihiro Uozu

Toshinori Sumi

Kikue Irie

Yasuo Wakui

Yahei Koyamada

Shiori Miyake

Noritaka Saito

Akimitsu Okita

Provided is a plate-type light guide () in which two opposing main surfaces are set as light emitting surfaces (A,B) and at least one side-edge surface is set as a light incidence surface (). In such a light guide, a light emitting mechanism () is provided in at least one region of at least one main surface; the haze value is 3% or lower in the region where the light emitting mechanism is provided; when a perfect diffuse light enters through at least one light incidence surface (), a maximum emission angle (&#x3b8;A, &#x3b8;B), at which maximizes the intensity of emitted light () from the main surface is in a range from &#x2212;60 degrees to +60 degrees with respect to a normal line to the main surface; and the utilization efficiency of emitted light is 15% or greater.

Light guide, manufacturing method of light guide, optical shutter, and planar light-source device

An optical communication apparatus comprises an optical transmitter () which emits light signals corresponding to external electric signals () using light emitted from a short-wavelength light-emitting element () such as a yellow light-emitting diode of maximum wavelength in a range of 560&#x2013;590 nm or a green light-emitting diode of maximum wavelength in a range of 490&#x2013;550 nm; a plastic fiber () including a methacrylate polymer core free from benzene rings and having one end connected optically with the short-wavelength light-emitting element (), the core containing less than 5 ppm free sulfur; and an optical receiver () having a photodetector element () connected optically with the other end of the plastic fiber () and adapted to producing an output electric signal () in accordance with the output from the photodetector element ().

Optical communication apparatus

A plastic optical fiber includes having a first core, a second core having a different refractive index from the first core, disposed concentrically on the outside of the first core, and a clad disposed concentrically on the outside of the second core, wherein a ratio X (r /r ) of a first core radius r to a second core radius r and a ratio Y (n /n ) of a refractive index difference n between the second core and the clad to a refactive index difference n between the first core and the clad are in a range that satisfies the expressions Y&gE;&minus;1.134X&plus;1.0518 (1), and X&lE;&minus;1.4842Y &plus;1.1097Y&plus;0.7097 (2), and provided that Y<0.4 or X&gE;0.76 and that coordinate pairs X&equals;0.8 and Y&equals;0.35 as well as X&equals;0.8 and Y&equals;0.45 are excluded. The plastic optical fiber can have a high transmission power and a wide bandwidth. A cable and an optical transimission device can each include this plastic optical fiber.

Plastic optical fiber, optical fiber cable and optical transmission device

Growing community of inventors

Aichi, Japan

Tomonari Yoshimura