The Furukawa Electric Co., Ltd.

Masanobu Sugimura

Hiroshi Okada

Masaaki Yamamoto

Yasumi Sasaki

Tatsuro Miura

Hideaki Kameoka

Shinichi Furumoto

Hirofumi Aoki

Hiroshi Sakai

Yoshikatsu Inagaki

Kazuhide Sakamoto

The invention provides a flattened heat pipe whose vapor flowing passage is not clogged and which has an excellent capillary force. The flattened heat pipe has a closed container formed by flattening a tubular container, a plurality of wick structures arrayed within the container in a longitudinal direction so as to form an acute-angled portion where a capillary force is large at least partially within the container, a hollow portion formed of an outer peripheral surface of the wick structure and an inner wall surface of the container and a working fluid sealed into the container.

Flattened heat pipe and manufacturing method thereof

A heat pipe suited for thinning, and achieving high heat transport performance is provided. A heat pipeaccording to the invention includes working liquid, a containerinto which the working liquid is sealed, and a mesh memberdisposed in such a position as to come into contact with at least two inner surfaces of the container, the two surfaces facing to each other. The mesh memberis formed by a plurality of meshesandlaminated on each other. The porosity in the portion where the respective meshesandcontact each other is lower than the porosity in the portion where the meshesandcontact the container

Heat pipe

In producing a foam insulated electric wire having an insulating layer made of a polyolefin foam, a foaming agent is employed, which is a liquid mixture of at least two kinds of compounds selected from the group consisting of ethers, esters, ketones and saturated hydrocarbons having boiling points of 100.degree. C. or below, or a liquid mixture of at least one kind of compound selected from the group consisting of ethers, esters, ketones and saturated hydrocarbons having boiling points of 100.degree. C. or below and at least one kind of liquid compound selected from the group consisting of ethers, esters, ketones, saturated hydrocarbons and alcohols having boiling points higher than 100.degree. C. but not exceeding 150.degree. C. Thus, a foam insulating layer having a high cell content and a low deformation ratio become available. Since the foam insulating layer has a high cell content and a low deformation ratio, the foam insulating layer, if reduced in diameter, is hardly squeezed. Since the foaming agent is a liquid, it can be supplied in an exact amount. The obtained wire is useful as a core applied to a high-speed signal transmission cable, an under-carpet cable, etc.

Method of producing a foam-insulated electric wire using a blowing agent

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Tokyo, Japan

Masanobu Sugimura