| 摘要 |
PURPOSE:To improve the directivity of an antenna for ultrasonic-wave reception by extending a feeder, connecting with the antenna or a lead wire extending to the feeder and by connecting to a point on a heating conductor whose directivity is small. CONSTITUTION:Plate glass is provided with antenna 21 for ultrasonic-wave reception that extends from feeding terminal 14 above heating conductor groups 13 and 13a in parallel to heating conductor 12 and has an open terminal by being folded and antenna 22 for ultrasonic-wave reception that extends in the opposite direction to antenna 21 from point 17 on lead wire 16 extending from feeding terminal 14 toward conductor 12 and has an open terminal by being folded. Lead wire 16 further extends to connection line 23, which after being extended, is repeatedly folded to obtain an enough length for phase matching between an FM broadcast radio wave received by conductor 12 and a radio wave received by antenna 21 or 22 at feeding terminal 14 or connection point 17, thereby connecting it to conductor 12 at connection point 18 where directivity is the smallest. |
