The Furukawa Electric Co., Ltd.

Toshio Miyahara

Naoki Kimura

Jun Niekawa

Yoshihiro Emori

Masanobu Nakamura

Yoshihiro Arashitani

An optical fiber holding apparatus in accordance with the present invention is characterized in that the same comprises a surface in order to hold an optical fiber which is to be a state of which is rolled up so as not to overlap with each other, wherein at least the surface is formed of a thermo conductive molding body which has a thermal conductivity to be higher than or equal to 0.5 W/mK, and which has an Asker C hardness to be between twenty and fifty. Or, the same comprises a peripheral surface in order to roll up and hold an optical fiber, wherein at least the peripheral surface is formed of a thermo conductive molding body which has the thermal conductivity to be higher than or equal to 0.5 W/mK, and which has the Asker C hardness to be between twenty and fifty. Moreover, it is desirable for the thermo conductive molding body to have a compressive strength of which a peak value is between ten and thirty N/cmand a stabilized value is between three and ten N/cm. Furthermore, it is desirable for the thermo conductive molding body to have the thermal conductivity to be higher than or equal to 1.0 W/mK and to have the Asker C hardness to be between twenty-five and forty.

Optical fiber holding apparatus

A heat-conductive rubber composition material, which comprises a rubber essentially consisting of an acrylic rubber, a butyl rubber, an ethylene propylene rubber or a blended rubber which comprises at least two of acrylic rubber, butyl rubber, and ethylene propylene rubber are blended, and 50 to 85 weight % of hydrophobic magnesium oxide powder, a heat-conductive rubber sheet prepared by forming the above thermal conductive rubber composition material, and a heat-conductive sheet, which comprises a soft metal sheet and a rubber layer formed on at least one surface of the soft metal sheet.

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Tokyo, Japan

Toshio Miyahara