| 摘要 |
There is provided a vacuum envelope having at least a first substrate, a second substrate opposed to the first substrate with a predetermined distance thereto, and plural spacers positioned between the first and second substrates, wherein a ratio eta defined by S/A in which A is the internal cross sectional area of the vacuum envelope in a cross section parallel to the principal plane of the first or second substrates and S is the total cross sectional area of the plural spacers on such cross section satisfies a relation 0.018%<=eta<=7.8%.
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