| 摘要 |
<p>A plurality of slots are provided so as to be located between a thin plate flexible opening section screen member and a heating chamber wall surface 1 for allowing insertion of the opening section screen member. A gently-curved bulging surface exists in an area where the heating chamber wall surface 1 and the opening section screen member 5 are mated together. As a result, residual warpage which would otherwise remain when the opening section screen member is warped for attachment becomes invisible, thereby preventing occurrence of clearance, which would cause sparking or the like.</p> |
