| 摘要 |
Each of spacers which defines an interval between substrates composing an envelope is fixed to the substrates while their linearity is kept by the tension exerted therein. In the fixation, it is set such that a fixing point of each of the spacers is located between points on which the tension is exerted. Thus, even when the tension is released, the linearity is maintained, so that a displacement of each of the spacers can be prevented to keep a high assembly accuracy.
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