| 摘要 |
A laser beam emitted from a laser oscillator unit passes through a first substrate and irradiates a sealing member. The sealing member irradiated with the laser beam is heated in accordance with the absorptance and thus softens and melts. The laser beam is reflected by the sealing member and the reflection reaches a detector unit. A computing unit transmits information, such as a correction value of the laser power, to a laser controlling unit on the basis of the information from the detector unit so that the melting state of the surface of the sealing member is kept constant. In this manner, the melting state of the sealing material can be maintained in an appropriate state.
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