| 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. A ratio eta is defined by S/A, in which A is the internal cross-sectional area of the vacuum envelope in a cross-section parallel to a plane of one substrate opposed to the other substrate and S is the total cross sectional area of the plural spacers on such cross section, and satisfies a relation 0.78%<=eta<=7.8%.
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