Silica glass yarn and silica glass cloth
AssigneeShin-Etsu Quartz Products Co., Ltd.
InventorKentaro Suzuki
Life of this patent
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Abstract
Provided are a silica glass yarn and a silica glass cloth which have a signal transmission speed that is made stable through stabilization of a characteristic impedance in addition to a low dielectric constant and a low loss. The silica glass yarn has a yarn habit density of 0.10 piece/cm or less of yarn habits each having a bending point with a radius of curvature of 5 mm or less and a bending angle of 120° or less. It is preferred that the silica glass yarn have a tensile strength of 2.0 GPa or more, and silica glass filaments forming the silica glass yarn each have a breaking start strength of 80.0% or more of the tensile strength of the silica glass yarn.
Claims14
A high-frequency circuit board silica glass yarn, which has a yarn habit density of 0.10 piece/cm or less of yarn habits each of the yarn habits having a bending point with a radius of curvature of 5 mm or less and having a bending angle of 120° or less,
- wherein silica glass filaments forming the silica glass yarn each have a filament diameter of from 3.0 μm to 10.0 μm,
- wherein a number of the silica glass filaments is from 20 to 300, and
- wherein a number of twists of the silica glass yarn is from 4 twists/m to 24 twists/m.
A high-frequency circuit board silica glass cloth, which is obtained by weaving and opening using a silica glass yarn having a yarn habit density of 0.10 piece/cm or less of yarn habits each having a bending point with a radius of curvature of 5 mm or less and a bending angle of 120° or less,
- wherein the silica glass cloth has an average value of a cloth thickness, which is measured with an electronic micrometer under a measuring pressure of 63.2 kPa, of from 100% to 110% of an average value of a cloth thickness, which is measured with the electronic micrometer under a measuring pressure of 157.9 kPa.
A high-frequency circuit board silica glass cloth, which is obtained by weaving and opening using a silica glass yarn having a yarn habit density of 0.10 piece/cm or less of yarn habits each having a bending point with a radius of curvature of 5 mm or less and a bending angle of 120° or less,
- wherein the silica glass cloth has a variation coefficient of a cloth thickness, which is measured with an electronic micrometer under a measuring pressure of 63.2 kPa, within 10%.
Dependencies are inferred from the claim text.