| CPC D03D 1/0082 (2013.01) [D03D 15/267 (2021.01); H05K 1/0306 (2013.01); H05K 1/038 (2013.01)] | 6 Claims |
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1. A glass cloth composed of a warp yarn and a weft yarn, each of which is formed by bundling together a plurality of glass filaments, wherein
a filament diameter Dt of the glass filaments constituting the warp yarn and a filament diameter Dy of the glass filaments constituting the weft yarn are each independently in a range of 0.5 μm or more and 4.5 μm or less,
a filament number Ft of the glass filaments constituting the warp yarn and a filament number Fy of the glass filaments constituting the weft yarn are each independently in a range of 150 or more and 3000 or less,
a weaving density Wt of the warp yarn and a weaving density Wy of the weft yarn are each independently in a range of 1.0 filaments/25 mm or more and 50.0 filaments/25 mm or less,
an average yarn width Bt of the warp yarn and an average yarn width By of the weft yarn are each independently in a range of 550 μm or more and 10000 μm or less,
a warp yarn fiber-opening efficiency coefficient Pt determined from the Dt, Ft, Wt, and Bt using a following formula (1) is in a range of 0.600 or more and 1.500 or less, and a weft yarn fiber-opening efficiency coefficient Py determined from the Dy, Fy, Wy, and By using a following formula (2) is in a range of 0.600 or more and 1.500 or less,
Rt, which is a ratio (Ft/Dt) of the filament number Ft of the glass filaments constituting the warp yarn to the filament diameter Dt of the glass filaments constituting the warp yarn, and Ry, which is a ratio (Fy/Dy) of the filament number Fy of the glass filaments constituting the weft yarn to the filament diameter Dy of the glass filaments constituting the weft yarn, are each independently in a range of 68.6 or more and 555.5 or less,
the Pt and Py satisfy a following formula (3), and
the glass cloth has a thickness of less than 10.0 μm:
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