Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1989-04-06
1990-11-13
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
174110f, 174110PM, 427119, 4283148, 4283166, 4283191, H01B 700, B32B 326
Patent
active
049701126
ABSTRACT:
The present invention relates to a very small diameter shielded wire having low electric capacitance and high dielectric breakdown voltage.
A shielded wire with polyethylene foam insulation has been widely used as interconnecting wires or cables between an antenna and a tuner of TV set, video equipments, computer equipments.
However, the shielded wire with polyethylene foam insulation has shown a problem of lowering the dielectric breakdown voltage when the wall-thickness of the polyethylene foam insulating layer is less than 300 microns.
The present invention has been achieved in order to solve the above described problem. That is to say, it has been found that the lowering of dielectric breakdown voltage can be remarkably reduced when the maximum diameter of bubbles within the polyethylene foam insulating layer are controlled less than a half times of the wall-thickness of the insulating layer, even though the wall-thickness of the insulating layer is less than 100 microns.
REFERENCES:
patent: 4352701 (1982-10-01), Shimba et al.
patent: 4683166 (1987-07-01), Yuto et al.
Sumitomo Electric Industries Ltd.
Van Balen William J.
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