| 摘要 |
<p>PURPOSE:To adjust the high-frequency attenuation characteristic of a chalk groove to suit the characteristics of high frequencies used. CONSTITUTION:This high-frequency leak preventive structure has a chalk groove 60 provided in a door D and a periodic structure 40 for adjusting the high-frequency attenuating effect of the chalk groove. The periodic structure 40 has first 40a and second 40b comb-shaped periodic members. The first comb-shaped periodic member 40a is roughly L-shaped. The periodic structure 40 is continued at the corner portions of the door D by the L-shaped corner portions 42 of the first comb-shaped periodic member 40a, so leakage of high frequencies can be prevented. The positions of installation of the first and second comb- shaped periodic members 40a, 40b are adjustable within the chalk groove 60.</p> |
