Fuji Photo Film Company, Limited

Fujifilm Corporation

Katsuya Takemasa

Ken Iwakura

Naotaka Wachi

Yoshisada Nakamura

Kensuke Ikeda

Masataka Sato

Hiroki Takahashi

Yasuyuki Mizushima

A POF includes an inner core having a refractive index distribution and an outer core provided on periphery of the inner core. A ratio Ra/Rb of an outer diameter of the inner core to the outer core satisfies 0.67&#x2266;(Ra/Rb)&#x2266;0.87 such that an outgoing beam from an end of the POF may have a parallel area of at least 200 &#x3bc;m. Thus a space between the end for exiting the exit light and a light receiving device can be kept at least 200 mm without members or devices for collimating.

Preform for plastic optical material, production method thereof, optical coupling method of plastic optical fiber and connector used for optical coupling

A heat-sensitive recording material comprising a support having thereon a color-developing layer and at least one UV-absorbing layer with a light-transmittance of 70% or less at 400 nm, 5% or less at 370 nm, and 70% or more for entire visible light range, is disclosed.

Heat-sensitive recording material

Growing community of inventors

Shizuoka, Japan

Katsuya Takemasa