Ultraschallverzoegerungsleitung

摘要

1,249,021. Glass for ultrasonic delay line. NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP. 28 March, 1969 [5 April, 1968], No. 16335/69. Heading C1M. [Also in Division H3] A glass for an ultrasonic delay line consists of (in weight per cent):- SiO 2 .. .. .. 57 - 78 PbO .. .. .. . 8 - 19 Al 2 O 3 .. .. .. 0À5- 9 Na 2 O .. .. .. 0 - 11 K 2 O .. .. .. 0 - 20 (Na 2 O+K 2 O) .. .. 9 - 20 Compatible metal oxides or fluorides .. .. 0 - 10 The compatible metal oxide may be As 2 O 3 and/or Sb 2 O 3 . Preferably the glass has a temperature coefficient of delay time less than 1À5 x 10-6/‹C., and an attenuation factor of less than 10 x 10-3 dB. per cycle over 1 MHz.